Kunming, China

Kunming University of Science and Technology is located in Kunming, the capital city of Yunnan Province, Southwestern China.As the goal by 2010, KUST is to become a key university with strong science and engineering background. The university is to be developed into an important provincial training base for advanced technical personnel, a research base for both applied fundamental research and hi-tech research, an industrialization base for hi-tech, and also a research and consulting center for the national social and economic development.Yunnan University Science Park was established as an experimental site of University Science Park in 1999 and was awarded the status of national university science park in May 2001. The Park is supported by Yunnan University, Kunming University of Science & Technology and Yunnan Normal University. Wikipedia.


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Liang K.-B.,Kunming University of Science and Technology | Guan Y.-H.,Kunming University of Science and Technology | Luo Y.-T.,Kunming University of Science and Technology
Proceedings of 2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference, IMCEC 2016 | Year: 2016

The traditional clustering segmentation method for human brain MRI usually divides pixels by the degree of similarity of the image gray value, but the effect is not ideal for the strong noise or the edge blur brain MRI. So we introduce the FCM membership function into Markov random field, and to cluster by the Markov random field advantage of space correlation, so as to reduce the influence of noise on the results. According to the view point of statistics, we establish a two-dimensional histogram of the human brain MRI to further reduce the impact of noise on image segmentation. Then the two-dimensional histogram is projected into the optimal one-dimensional histogram, so as to diminish the calculation. And the optimal segmentation threshold is obtained depending on fitting of the statistical results by the Gaussian model. In this paper, a large number of experimental results have shown that the method proposed has good segmentation effects for human brain MRI. © 2016 IEEE.


Liang F.,Kunming University of Science and Technology | Tanaka M.,Kyushu University | Choi S.,Jeju National University | Watanabe T.,Kyushu University
Carbon | Year: 2017

Diffuse and multiple arc-anode attachment modes were observed when using DC arc discharge to prepare carbon nanomaterials. The effects of arc current and electrode gap distance on the formation of different attachment modes were investigated. The formation of different attachment modes is explained by the competition of the cathode jet and the anode jet. During the arc discharge, the surface temperature of the carbon electrode was measured by two-colour pyrometry combined with a high-speed camera employing appropriate band-pass filters. The relationship between the arc-anode attachment mode and the temperature fluctuation of the electrode surface was investigated. Due to the unbalanced Lorenz force, the rotation of arc spot was severe in diffuse arc-anode attachment mode, which led to relatively large temperature fluctuations on the anode surface, resulting in low purity of synthesised multi-wall carbon nanotubes on the anode deposit. © 2017 Elsevier Ltd


Chong X.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology | Zhou R.,Kunming University of Science and Technology | Feng J.,Kunming University of Science and Technology
Journal of the American Ceramic Society | Year: 2016

The alloying element effect on the thermophysical properties of Cr7C3-type ceramics is essential for the applications. The thermal expansion for these compounds is calculated using quasi-harmonic approximation combined with density functional theory. The linear expansion coefficient along [100] direction is larger than that along [010] and [001] direction. The B- and Mo-codoped Fe4Cr3C3 has the smallest thermal expansion coefficient. We obtained the temperature dependence of bulk modulus, pressure derivative modulus, and the Grüneisen constants. Furthermore, we propose a new method to calculate the anisotropy of minimum thermal conductivity which is suitable to the large complex unit cells. The three-dimensional (3D) expression of anisotropy of minimum thermal conductivity are presented companied with planar projections on (100), (010), (001), and (110) crystal planes. The minimum thermal conductivity of Fe3Cr3WC2B is lower than other multicomponent compounds. The charge density differences and chemical bonding between Mo/W and B are found to be the key factor on the thermophysical properties of these compounds. © 2017 American Ceramic Society.


Feng Q.,Kunming University of Science and Technology | Zhao W.,Kunming Metallurgical Research Institute | Wen S.,Kunming University of Science and Technology | Cao Q.,Kunming University of Science and Technology
Separation and Purification Technology | Year: 2017

The effect of lead ions on cassiterite flotation with salicylhydroxamic acid as collector was assessed by a combination of microflotation tests, adsorption experiments, zeta-potential determinations, and X-ray photoelectron spectroscopy (XPS) analysis in this work. Microflotation tests confirmed the contribution of lead ions to cassiterite flotation at an increased floatability of 12.12% compared with that in the absence of lead ions. The adsorption experiments demonstrated that the adsorbed amount of SHA onto cassiterite surfaces was greatly increased after treatment with lead ions. The results of zeta-potential determinations indicated that the cassiterite surface was activated by the adsorption of lead species in the form of Pb(OH)+, and the higher adsorption capacity of SHA onto the mineral surface was obtained after modifying with lead ions. XPS analysis revealed that lead ions adsorbed onto the mineral surface through the interaction between lead species and oxygen sites of cassiterite surfaces. This occurrence increased the number of active sites on the mineral surface and improved the collector attachment. These results consistently indicated that the activity of the cassiterite surface increased after pretreatment with lead ions and enhanced the flotation behavior. © 2017 Elsevier B.V.


Jiafang M.A.,Kunming University of Science and Technology | Guangtao M.,Yunnan Academy of Forestry | Liping H.E.,Yunnan Academy of Forestry | Guixiang L.I.,Yunnan Academy of Forestry
IOP Conference Series: Earth and Environmental Science | Year: 2017

(1) Remediation of soil contaminated by heavy metals has become a hot topic in the world, and phytoremediation technology is the most widely used. (2) In addition to traditional economic benefits, ecological benefits of artificial forest have been more and more important, which are very helpful to soil polluted with heavy metals in the environment. (3) The characteristics of heavy metal pollution of soil and plantations of repair mechanism have been reviewed, and the current mining areas, wetlands, urban plantations on heavy metal elements have enriched the research results. The purpose is to find a new path for governance of heavy metal soil pollution. © Published under licence by IOP Publishing Ltd.


Wendai L.,Kunming University of Science and Technology | Shunji J.,Kunming University of Science and Technology | Hua P.,Kunming University of Science and Technology
Journal of Computational and Theoretical Nanoscience | Year: 2016

In order to obtain an optimized portfolio scheme and improve the rate of return, the Thesis proposes a global-oriented portfolio model on basis of an improved Artificial Fish Swarm Algorithm (AFSA). First, a mathematic portfolio model is built; then, AFSA is adopted to solve the model. During the solving process, ergodicity of chaotic motion is used to solve the local optimization problems of AFSA. Combining with feedback strategy, solution efficiency of AFSA is successfully improved. The simulation results also show that, compared with reference algorithm, the improved AFSA can lead to more satisfying portfolio schemes, as well as higher rate of return and minimum investment risk, thus is of higher application value. Copyright © 2016 American Scientific Publishers All rights reserved.


Zhang B.,Kunming University of Science and Technology | Yu Z.-W.,Ningbo University of Technology | Shao J.-S.,Ningbo Dahongying University
Journal of Computational and Theoretical Nanoscience | Year: 2016

In this paper, we use the Choquet integral to propose the normal distribution interval number Choquet ordered averaging operator. The operator not only considers the importance of the elements, but also can reflect the correlations among the elements. It is worth pointing out that most of the existing normal distribution interval numbers averaging operators are special cases of our operator. Finally an illustrative example for comprehensive evaluation in enterprise operation environment with normal distribution interval number is given to use the operator in the range of uncertain multiattribute decision-making. The results show that the method proposed in this paper is feasible. © Copyright 2016 American Scientific Publishers All rights reserved.


Shao J.-S.,Ningbo Dahongying University | Yu Z.-W.,Ningbo University of Technology | Zhang B.,Kunming University of Science and Technology
Journal of Computational and Theoretical Nanoscience | Year: 2016

In this paper, we investigate the multiple attributes group decision making (MAGDM) problems in which attribute values take the form of interval grey uncertain linguistic variables. Firstly, we develop the interval grey uncertain linguistic variables weighted geometric (IGULWG) operator, the interval grey uncertain linguistic variables ordered weighted geometric (IGULOWG) operator and the induced interval grey uncertain linguistic variables ordered weighted geometric (I-IGULOWG) operator and study some desirable properties of the I-IGULOWG operator. Furthermore, we apply the I-IGULOWG operator and the IGULWG operator to the group decision making with interval grey uncertain linguistic information. Finally, an illustrative example for evaluating the technological SMEs' independent innovation capacity with interval grey uncertain linguistic information is given to verify the developed approach and to demonstrate its practicality and effectiveness. © Copyright 2016 American Scientific Publishers All rights reserved.


Kong X.-Y.,Kunming University of Science and Technology | Wang G.-J.,Kunming University of Science and Technology
Journal of Computational and Theoretical Nanoscience | Year: 2016

Stiffened respectively the tail sand from the KunYang phosphate rock with 1, 2, 3 layer and respectively experiment triaxial compression. Tail sand after reinforcement were found that: cohesive force C is non-linear increase with layer increase and internal frictional angle φ almost invariant in shear failure. Tail sand in the stage of elastic deformation when axial strain is less than 4%-5% and tail sand in the stage of elastic-plastic coupling deformation when axial strain is more than 5%. Copyright © 2016 American Scientific Publishers All rights reserved.


Wang C.,Kunming University of Science and Technology | Gan S.,Kunming University of Science and Technology | Yi D.,Kunming University of Science and Technology | Wu Y.,Kunming University of Science and Technology
Communications in Computer and Information Science | Year: 2017

Remote sensing image classification is an important technology to get information. At present, different remote sensing monitoring methods has been widely used in region land cover. To improve classification accuracy is the key of remote sensing data processing and application. This paper selects Xingyun Lake that the typical Plateau Lake area of Yunnan province and the surrounding lakeside zone as research area. Based on the 30 TM Landsat remote sensing image of the research area, using supervised classification, BP neural network, and object-oriented classification to compare accuracy of three kinds of classification methods. It was found that development of BP neural network and object-oriented classification training produces more accurate results than supervised training. Object-oriented classification also produced more accurate classification than the BP neural network classification, but did not improve the accuracy significantly. The results will help to promote surface coverage information of remote sensing rapidly extraction and dynamic monitoring in the Yunnan plateau lake, moreover, it has important scientific significance to protect and formulate rationalization. © Springer Nature Singapore Pte Ltd. 2017.


Shi S.,Kunming University of Science and Technology | Yin Y.,Yunnan Engineering Institute of Surveying and Mapping
Communications in Computer and Information Science | Year: 2017

According to the actual demand of land regulation, this paper presents a field patrol inspection system combining GPS and tablet PC through the integration of hardware and software. This paper has overall designed the function and framework of the field patrol inspection system. On the fundamental of solving some key technical problems such as serial communication between PDA and tablet PC and intelligent processing of date, this paper has developed a integrated field patrol inspection system by combining GPS and tablet PC on the basic of GIS. This technology is already verified in practice and proved to be feasible, which will improve the efficiency of land management and can achieve indoor and field integration of field patrol inspection work. © Springer Nature Singapore Pte Ltd. 2017.


Yi L.,Kunming University of Science and Technology | Ma S.,Kunming University of Science and Technology | Ren D.,Kunming University of Science and Technology
Phytochemistry Reviews | Year: 2017

Epidemiological studies have suggested an inverse relationship between increased consumption of fruits and reduced risk of chronic diseases, such as cardiovascular diseases, cancer, and diabetes. Citrus fruit is one of the mostly consumed fruits worldwide, and numerous studies have revealed its remarkable health-promoting activities, such as antioxidant, anticancer, anti-inflammatory, and cardiovascular protection activities. These activities largely depend upon the diverse chemical constituents of Citrus fruits, including vitamins, minerals, terpenoids, and flavonoids. Notably, dietary flavonoids occurring in Citrus fruits have attracted growing interest due to their distinct beneficial effects on human health. In this review, we outlined the main health-related properties of Citrus flavonoids, with a focus on antioxidant, anticancer, anti-inflammation, and cardiovascular protection activities. Also the bioavailability, a critical factor that influences the biological efficacy, of Citrus flavonoids was discussed. It was believed that insights about these advances may encourage researchers to discover new phytochemical components and further study specific bioactivities from Citrus fruits. © 2017 Springer Science+Business Media Dordrecht


Dai J.-Q.,Kunming University of Science and Technology | Xu J.-W.,Kunming University of Science and Technology | Zhu J.-H.,Kunming University of Science and Technology
Applied Surface Science | Year: 2017

We present first-principles DFT+U calculations to investigate the stoichiometric (0001) polar surfaces of multiferroic R3c BiFeO3. We predict that the complete Fe-O3-Bi trilayer, which is characterized by almost vanishing compensating charge, forms the most stable negative and positive surfaces. A large inward relaxation is found for the outermost Fe atomic layer at the negative surface, while the O3 atomic layer in the positive surface exhibits a remarkable in-plane rotational reconstruction. Our results show that the insulating nature of BiFeO3 persists at both surfaces but the negative termination is distinguished from the positive surface by the gap state. It is also found that the ferroelectric polarization and weak ferromagnetism of both surfaces have somewhat enhanced character because of relaxation and rehybridization of the surface atoms. Not only the different atomic/electronic structures but also the opposite polarization orientations indicate the distinct chemical properties between the negative and the positive (0001) surfaces and consequently many intriguing applications. © 2016 Elsevier B.V.


Shen A.,Kunming University of Science and Technology | Shen A.,CAS Ningbo Institute of Material Technology and Engineering | Zhao D.,CAS Ningbo Institute of Material Technology and Engineering | Sun W.,CAS Ningbo Institute of Material Technology and Engineering | And 2 more authors.
Scripta Materialia | Year: 2017

Elastocaloric effect for a Co50Ni20Ga30 single crystal has been investigated. A local adiabatic temperature change (ΔT) of − 6 K was observed on the removal of a uniaxial stress of 150 MPa at 291 K. Infrared thermography measurement reveal a correlated response of martensitic bands and temperature mapping. Both elastocaloric effect and superelasticity exhibit a good reversibility in the 100 times of cycling test. The experimentally obtained ΔT value agrees well with the theoretical one by analyzing the temperature dependence of critical stress based on the Clausius-Clapeyron equation. © 2016 Acta Materialia Inc.


Wang M.,Kunming University of Science and Technology | Zhao R.,Kunming University of Science and Technology | Qing S.,Kunming University of Science and Technology | Liu Y.,Kunming University of Science and Technology | Zhang A.,Kunming Sino platinum Metals Catalyst Co.Ltd
Applied Thermal Engineering | Year: 2017

In order to study the influence of the change of oxygen concentration on combustion characteristics of coal, in the simultaneous thermal analysis was carried out on different oxygen concentration of Xiaolongtan young lignite (21%, 30%, 50%, and 80%) combustion characteristics experiments under the mixed O2/CO2 atmosphere. Determined the combustion characteristics of pulverized coal with different oxygen concentration. Experimental results show that, with the increase of oxygen concentration, the DTG curve of pulverized coal shifted towards lower temperature range, the ignition temperature and burnout temperature of coal sample decreased, combustion time shorten, burning speed accelerated, flammability index increased. Meanwhile, at different heating rates, with the increase of heating rate, the temperature of the same burnout rate increase, with the increase of temperature, the coal sample's burnout rate increased. With the decrease of pulverized coal's particle size, lignite ignition temperature and burnout temperature are both decreased, at the same time burnout time also shorten. When the oxygen concentration is larger than 30%, pulverized coal's combustion characteristic parameter change slowly. Thus, industry, considers the cost of oxygen-enriched, it can control oxygen concentration at 30%. © 2016 Elsevier Ltd


Sun L.,Kunming University of Science and Technology | Liu Q.,Kunming University of Science and Technology | Bao C.,Kunming University of Science and Technology | Fan J.,Kunming University of Science and Technology
Molecules | Year: 2017

Thirteen popular wild edible mushroom species in Yunnan Province, Boletus bicolor, Boletus speciosus, Boletus sinicus, Boletus craspedius, Boletus griseus, Boletus ornatipes, Xerocomus, Suillus placidus, Boletinus pinetorus, Tricholoma terreum, Tricholomopsis lividipileata, Termitomyces microcarpus, and Amanita hemibapha, were analyzed for their free amino acid compositions by online pre-column derivazation reversed phase high-performance liquid chromatography (RP-HPLC) analysis. Twenty free amino acids, aspartic acid, glutamic acid, serine, glycine, alanine, praline, cysteine, valine, methionine, phenylalanine, isoleucine, leucine, lysine, histidine, threonine, asparagines, glutamine, arginine, tyrosine, and tryptophan, were determined. The total free amino acid (TAA) contents ranged from 1462.6 mg/100 g in B. craspedius to 13,106.2 mg/100 g in T. microcarpus. The different species showed distinct free amino acid profiles. The ratio of total essential amino acids (EAA) to TAA was 0.13-0.41. All of the analyzed species showed high contents of hydrophobic amino acids, at 33%-54% of TAA. Alanine, cysteine, glutamine, and glutamic acid were among the most abundant amino acids present in all species. The results showed that the analyzed mushrooms possessed significant free amino acid contents, which may be important compounds contributing to the typical mushroom taste, nutritional value, and potent antioxidant properties of these wild edible mushrooms. Furthermore, the principal component analysis (PCA) showed that the accumulative variance contribution rate of the first four principal components reached 94.39%. Cluster analysis revealed EAA composition and content might be an important parameter to separate the mushroom species, and T. microcarpus and A. hemibapha showed remarkable EAA content among the 13 species. © 2017 by the authors.


Meng Q.,Kunming University of Science and Technology | Zhang Y.,Kunming University of Science and Technology | Dong P.,Kunming University of Science and Technology
Waste Management | Year: 2017

A hydrometallurgical leaching process has been developed for recovery of Co and Li from cathode material (LiCoO2) collected from spent LIBs using a mix solution of glucose and phosphoric acid. The spent LiCoO2 before and after leaching process are analyzed by scanning electron microscopy. A leaching rate of about 98% Co and nearly 100% Li is presented with 1.5mol/L phosphoric acid and 0.02mol/L glucose at 80°C in about 2h. During leaching process, glucose was oxidized into monocarboxylic acid with reduction of Co(III) to Co(II). Co in solution was recovered as Co-oxalate after leaching process. Using glucose as reductant to dissolve LiCoO2 with chelating agent of phosphoric acid is achieved here. © 2017 Elsevier Ltd.


Dai J.-Q.,Kunming University of Science and Technology | Xu J.-W.,Kunming University of Science and Technology | Zhu J.-H.,Kunming University of Science and Technology
ACS Applied Materials and Interfaces | Year: 2017

The relative stability of multiferroic BiFeO3 (0001) surfaces, which is the (111) facet in the pseudocubic notation, with different stoichiometry is systematically studied by using ab initio thermodynamic approach in order to obtain insights into the stable surface terminations. We predict that under most chemical potential conditions the thermodynamically favored terminations for the negative and positive surfaces are -Bi-O2 and -Fe-O3-Bi, respectively. The predicted difference in oxygen content between the negative and positive surfaces is consistent with experimental observations at the BiFeO3/metal interfaces (Nat. Mater., 2014, 13, 1019, DOI: 10.1038/nmat4058; Adv. Mater., 2015, 27, 6934, DOI: 10.1002/adma.201502754). We determine the atomic geometries and electronic states as well as the magnetic properties for the negatively and positively polarized stable surfaces. Our results demonstrate that not only the stoichiometry and atomic geometries but also the electronic and magnetic properties of the BiFeO3 (0001) surfaces show strong dependence on the ferroelectric polarization direction. Therefore, we expect that the surface physical and chemical properties of the BiFeO3 (0001) surfaces can be easily tuned by an external electric field. © 2016 American Chemical Society.


Yan P.,Kunming University of Science and Technology | Chong X.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology | Feng J.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2017

From first-principle calculations with the Local Density Approximation (LDA) and Generalized Gradient Approximation (GGA) approaches, the structural, elastic, electronic and thermodynamic properties of the PdTM and Pd31TM(TM = Ti, Zr, Hf) alloy have been investigated in this work. The calculated cohesive energy and formation enthalpies of these alloys, the PdZr and Pd31Zr have the lowest formation enthalpy with −0.57 and −0.13 eV/atom, respectively. It is calculated the elastic constants of crystal, bulk shear, Young's modulus and Poisson's ratio of the PdTM and Pd31TM(TM = Ti, Zr, Hf) compounds. The elastic constants show that these alloys are mechanically stable, and PdTi has the largest shear modulus and Young's modulus within 103.2 GPa and 36.9 GPa, respectively. Pd31Ti also has the largest shear modulus i.e. 70.5 GPa, and Pd31TM (TM = Ti, Zr, Hf) compounds have almost similar Young's modulus. The anisotropic mechanical properties of the PdTM and Pd31TM(TM = Ti, Zr, Hf) are discussed by the anisotropic index, three-dimensional (3D) surface contours and the planar projections on (001) and (110) planes of the Young's modulus. Vogit and Reuss method are used to estimate the effects of different concentrations of transition elements on the mechanical properties. The electronic structures and chemical bonding characteristics are analyzed by the band structures and the density of states. When compared with Ni-Base superalloys, Pd-Base alloys have excellent properties with great potential application as next generation superalloy at higher temperature. © 2017 Elsevier B.V.


Feng Q.,Kunming University of Science and Technology | Wen S.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2017

The interaction between sulfide-ion species and smithsonite surfaces and its response to flotation performance were investigated by means of microflotation experiments, surface-adsorption tests, zeta-potential determination, and X-ray photoelectron spectroscopy (XPS) analysis. The microflotation experiments results indicated that addition of Na2S elicited a positive effect on the smithsonite floatability within an appropriate concentration range (<7.5 × 10−4 mol/L), otherwise it showed an obvious negative influence. The surface adsorption tests showed that a significant difference in amounts of sulfide-ion species retained in the pulp solutions was exhibited after smithsonite samples were sulfidized with different concentrations of Na2S. The negativity of the zeta-potential increased with increasing Na2S concentration but decreased under alkaline conditions after adding NaAX. The XPS analysis results revealed that zinc sulfide species formed on the smithsonite surface after sulfidization, and its contents increased with increasing Na2S concentration. Moreover, the sulfidization product formed on the mineral surface was composed of monosulfide and polysulfide, and polysulfide played an important role in the sulfidization flotation of smithsonite. These results demonstrated that excess Na2S concentrations could enhance smithsonite sulfidization but could inhibit the adsorption of collector onto the sulfidized smithsonite surfaces due to the abundant sulfide-ion species retained in the pulp suspension. © 2017 Elsevier B.V.


Zhao S.-C.,Kunming University of Science and Technology | Wei X.-J.,Kunming University of Science and Technology | Wu Q.-X.,Kunming University of Science and Technology
Superlattices and Microstructures | Year: 2017

Quantum lossy left-handed transmission lines (LHTLs) are central to the miniaturized application in microwave band. This work discusses the NRI of the quantized lossy LHTLs in the presence of the resistance and the conductance in a displaced squeezed Fock state (DSFS). And the results show some novel specific quantum characteristics of NRI caused by the DSFS and dissipation, which may be significant for its miniaturized application in a suit of novel microwave devices. © 2017 Elsevier Ltd


Huang L.,Kunming University of Science and Technology | Yu X.,Kunming Surveying and Mapping Institute | Zuo X.,Kunming University of Science and Technology
International Journal of Aerospace Engineering | Year: 2017

Due to the unmanned aerial vehicle remote sensing images (UAVRSI) within rich texture details of ground objects and obvious phenomenon, the same objects with different spectra, it is difficult to effectively acquire the edge information using traditional edge detection operator. To solve this problem, an edge detection method of UAVRSI by combining Zernike moments with clustering algorithms is proposed in this study. To begin with, two typical clustering algorithms, namely, fuzzy c -means (FCM) and K -means algorithms, are used to cluster the original remote sensing images so as to form homogeneous regions in ground objects. Then, Zernike moments are applied to carry out edge detection on the remote sensing images clustered. Finally, visual comparison and sensitivity methods are adopted to evaluate the accuracy of the edge information detected. Afterwards, two groups of experimental data are selected to verify the proposed method. Results show that the proposed method effectively improves the accuracy of edge information extracted from remote sensing images. © 2017 Liang Huang et al.


Wang J.,Kunming University of Science and Technology | Chong X.,Kunming University of Science and Technology | Zhou R.,Kunming University of Science and Technology | Feng J.,Kunming University of Science and Technology
Scripta Materialia | Year: 2017

The RETaO4 ceramics with low-thermal conductivity were fabricated using a solid-state reaction. The phase composition and microstructures of high-temperature RETaO4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) ceramics were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy. The RETaO4 ceramics had lower thermal conductivity (1.38 to 1.94 W·m− 1·K-1 at 800 °C) than 7-8YSZ (2.37 and 2.47 W·m− 1·K− 1 at 800 °C, respectively). The porosity significantly affected the thermal conductivity of RETaO4 ceramics. The RETaO4 ceramics also had lower Vickers hardness than 8YSZ, which suggests that RETaO4 has better fracture toughness and thermal tolerance. © 2016 Acta Materialia Inc.


Sun S.,Kunming University of Science and Technology | Guo Y.,Kunming University of Science and Technology | Wu X.,Kunming University of Science and Technology
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2017

Several traditional gear diagnosis methods are reviewed. The narrow band demodulation method is often accompanied with low-frequency interference and the resonance demodulation technique is limited in amplitude demodulation. According to the pros and cons of the traditional methods, the resonance band amplitude-phase demodulation technique was proposed for local gear fault detection to compensate the current gear diagnosis methods. It's a method that taking the resonance frequency as carrier frequency instead of meshing harmonics, hence the low-frequency interference can be suppressed. Amplitude demodulation incorporated with phase demodulation will make the diagnosis more accurate. In this scheme, the fast kurtogram is firstly used to find out the resonance band. Then take the resonance frequency as carrier frequency and implement the resonance band amplitude-phase demodulation program gets both the amplitude and phase modulation functions, which would indicate the gear fault. Simulation and experiment studies indicated that the proposed method is an effective tool for early gear tooth cracking fault detection. © 2017, Editorial Department of JOURNAL OF MECHANICAL STRENGTH. All right reserved.


Wang Z.,Kunming University of Science and Technology | Shen L.,Kunming University of Science and Technology | Wu Z.,Kunming University of Science and Technology
Modern Tunnelling Technology | Year: 2017

Based on conformal mapping of the complex variable function, the semi-infinite plane of a tunnel was transformed into a concentric ring region. With the soil around the tunnel regarded as a homogeneous, continuous, isotropic, saturated medium, the boundary collocation method was applied to control the local leakage of shield tunnels. The analytic method and numerical method were combined to solve the basic differential equation of the twodimensional seepage of saturated soil masses under steady seepage, and a semi-numerical and semi-analytical solution of pore water pressure variations due to local water leakage of shield tunnels is obtained. The effects of the water leakage range, location, and total water head difference between the ground surface and the tunnel leakage boundary on the pore water pressure of the soil mass around the tunnel are discussed through this calculation method. The results show that there are great changes to the pore water pressure under a one time central buried depth of a tunnel in the horizontal direction when lateral water leakage occurs, and the larger the leakage range, the more significant the decay rate of the pore water pressure; the larger the total water head difference between the ground surface and tunnel leakage boundary, the more obvious the influence is on the pore water pressure of the soil mass, and it is proportional to the total water head difference and volume of the pore water pressure reduction; and the lateral leakage volume of tunnels increases with an increase of the total water head difference, being characterized by a linear relationship. © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Xu H.,Kunming University of Science and Technology | Song P.,Kunming University of Science and Technology
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2017

Currently, studies on aerostatic dry gas seals are mostly limited to their steady characteristics, while little attention has been paid on their unsteady characteristics, which are very important to allow the seals to have excellent operating performance so far. Hence the aerostatic dry gas film pressure governing equations and unsteady Reynolds equations are solved by using small perturbation and finite difference methods under the condition of three degrees of freedom perturbation. The influences of squeeze number, frequency number and supplying gas pressure on the unsteady characteristics are investigated. The results show that the axial direct dynamic gas film stiffness increase with increasing squeeze number, frequency number and supplying gas pressure, but the direct dynamic gas film stiffness in two angular directions is little influenced by the squeeze number. The axial direct damping coefficient and direct damping coefficients in two angular directions decrease with increasing squeeze number and supplying gas pressure. The axial direct damping coefficient decreases fast when the squeeze number is less than 20. The cross coupled dynamic stiffness and damping coefficients of two angular directions have an axisymmetric feature. The coupled dynamic stiffness and damping coefficients have a little relation with squeeze number when the number is in the range of 1-40, but increase with the increasing number if the number is larger than 40. © 2017, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.


Wang W.-Q.,Kunming University of Science and Technology | Zhang G.-W.,Kunming University of Science and Technology | Yan Y.,Kunming University of Science and Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2017

To avoid the traditional body-fitted numerical methods and extend the application of immersed boundary method to complex flow, a new numerical method for simulating complex flow based on the implicit direct force immersed boundary method is presented. A mathematical model described the interaction between an immersed rigid body and fluid is established and whose governing equation is solved using the projection step method similar to the fractional step method for solving the incompressible Navier-Stokes equation. The moment source is not pre-calculated, but determined implicitly in such a way that velocity at the immersed boundary interpolated from the corrected velocity field accurately satisfies the no-slip boundary condition. Also, the second velocity near the solid wall updated is implemented using a δ smooth function. The QUICK upwind scheme and the second central scheme are applied to solve convection and diffusion terms respectively. The second explicit Adams-Bashforth method is used to the time discretization. The present immersed boundary method(IBM) is validated by the basic numerical example of flowing over one cylinder at Reynolds number 25, 40 and 300. © 2017, Engineering Mechanics Press. All right reserved.


Lv P.,Kunming University of Science and Technology | Zhou C.,Kunming University of Science and Technology | Zhao Y.,Kunming University of Science and Technology | Liao X.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology
Carbohydrate Polymers | Year: 2017

Cyclodextrin-based supermolecular systems have become one of significant nonviral gene delivery carriers. In this study, epsilon-polylysine-grafted-succinic acid-grafted-β-cyclodextrin-LMW PEI (PPC) and adamantane-functionalized poly-(ethylene glycol) derivative (PEG-AD) were synthesized, and PEG-AD was encapsulated into PPC to form the complexes. These complexes were used to condense pDNA to make polyplexes, which biophysical properties, cytotoxicity and transfection efficiencies were studied. The results showed that the polyplexes were less cytotoxic than branched PEI without degrading the transfection efficiency. These findings suggest that the complexes with high stability could be an effective and low-toxicity carrier for delivering nucleic acid to target cells. © 2017 Elsevier Ltd


Wu D.,Kunming University of Science and Technology | Mao Y.,Honghe University | Deng J.,Kunming University of Science and Technology | Wen S.,Kunming University of Science and Technology
Applied Surface Science | Year: 2017

The activation mechanism of ammonium ions on the sulfidation of malachite (−201) was determined by density functional theory (DFT) calculations. Results of DFT calculations indicated that interlayer sulfidation occurs during the sulfidation process of malachite (−201). The absorption of both the ammonium ion and sulfide ion on the malachite (−201) surface is stronger than that of sulfur ion. After sulfidation was activated with ammonium ion, the Cu 3d orbital peak is closer to the Fermi level and characterized by a stronger peak value. Therefore, the addition of ammonium ions activated the sulfidation of malachite (−201), thereby improving the flotation performance. © 2017 Elsevier B.V.


Liu Q.,Kunming University of Science and Technology | Li X.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology
Vacuum | Year: 2017

A mixed Lagrangian and Eulerian algorithm (MILE) is used to simulate the temperature field during the solidification process of the large-scale Ti-6Al-4V alloy slab ingot in electron beam cold hearth melting (EBCHM). Based on the finite element (FE) method coupled with the cellular automation (CA) model, the microstructure evolution of the ingot is obtained in this paper. The simulated results show that with the pulling speed increasing from 1 × 10−4 m/s to 3.5 × 10−4 m/s, the liquidus depth increases from 0.64 cm to 0.70 cm, the length of the transition region increases and the mean grain size is found to increase. With the pouring temperature increasing from 1953 K to 2013 K, the liquidus depth increases from 0.42 cm to 1.34 cm and the length of the transition region increases, whereas the depth of mushy zone decreases. The region near the bottom of the ingot has finer grains for the non-steady solidifying state of TC4 alloy. Moreover, the role of pulling speed is much greater than that of pouring temperature on the microstructure evolution during EBCHM for large-scale TC4 alloy slab ingot. © 2017 Elsevier Ltd


Zhao Q.,Kunming University of Science and Technology | Xie M.,Kunming Institute of Precious Metals | Liu Y.,Kunming University of Science and Technology | Yi J.,Kunming University of Science and Technology
Applied Surface Science | Year: 2017

A novel method was developed to deposit nanosized silver particles on multi-walled carbon nanotubes (MWCNTs). The electroless plating of silver on MWCNTs accomplished in small solution drops generated by ultrasonic spray atomization, which inhibited excessive growth of silver particles and led to much more uniform nanometer grain-sized coatings. The results showed that pretreatment was essential for silver particles to deposit on the MWCNTs, and the electrolyte concentration and reaction temperature were important parameters which had a great influence on the morphology and structure of the silver coatings. Possible mechanisms of this method are also discussed in the paper. © 2017 Elsevier B.V.


Dai W.-W.,Kunming University of Science and Technology | Zhao Z.-Y.,Kunming University of Science and Technology
Materials Chemistry and Physics | Year: 2017

As promising photocatalyst driven by visible-light, BiOI has attracted more and more attention in the past years. However, the surface structure and properties of BiOI that is the most important place for the photocatalytic have not been investigated in details. To this end, density functional theory was performed to calculate the structural and electronic properties of four low-index stoichiometric surfaces of BiOI. It is found that the relaxation of the low-index BiOI surfaces are relatively small, especially the (001) surface. Thus, the surface energies of BiOI are very relatively small. Moreover, there are a few surface states below the bottom of conduction band in the first layer except the (001) surface, which maybe capture the photo-excited carriers. In all of the most stable terminated planes, all the dangling bonds are cleaved from the broken Bi[sbnd]O bonds. In the case of (001) surface, the dangling bond density of Bi atoms for the (001) surface is zero per square nano. Therefore, the (001) surface is thermodynamically lowest-energy surface of BiOI, and it is the predominant surface (51.4%). As a final remark, the dangling bonds density of bismuth atoms determines not only the surface energy, but also the surface relaxation. Finally, the equilibrium morphology of BiOI was also proposed and provided, which is determined through the Wulff construction. These results will help us to better understand the underlying photocatalytic mechanism that is related to BiOI surfaces, and provide theoretical support for some experimental studies about BiOI-based photocatalyst in future. © 2017 Elsevier B.V.


Chen Y.,Kunming University of Science and Technology | Zhu L.,Kunming University of Science and Technology | Si T.,Kunming University of Science and Technology
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2017

Mesoporous multi-metal phosphates of CaZrPO and AlZrPO were synthesized by a facile evaporation-induced self-assembly (EISA) method with an amphiphilic block copolymer, F127 as a template and ethanol as a solvent. The mesoporous structures and thermal stability were characterized by N2 adsorption-desorption analysis, transmission electron microscopy and small angle X-ray diffraction. The chemical state and coordination modes of metal ions in frameworks of these two mesoporous phosphates were determined by Fourier transform infrared spectroscopy, magic angle spinning nuclear magnetic resonance, X-ray photoelectron spectroscopy and UV-Vis diffuse reflectance spectroscopy. The results indicate that the two mesoporous phosphates both exhibit amorphous pore wall and two-dimensional hexagonal structure with average pore diameters of 7~10nm and specific surface area of 120~260 m2/g. Calcium and aluminum ions are uniformly dispersed in the pore-wall framework and the calcium ion has an influence on the Zr-O tetrahedral coordination unit, while aluminum ion has little influence. The mesoporous phosphates with CaZrPO calcined at 700℃ and AlZrPO calcined at 800℃ both possess a great thermal stability. The difference of coordination capability between the two metal cations could be due to their different thermal stabilities. © 2017, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.


Yi S.,Chongqing Cancer Institute & Hospital & Cancer Center | Yang B.,Kunming University of Science and Technology | Liao R.,Chongqing Emergency Medical Center
International Journal of Polymer Analysis and Characterization | Year: 2017

A series of novel pendant polymers, composed of a poly(ε-lysine) (ε-PL) ((Formula presented.)w: 4,000 g mol−1) main chain and three kinds of amino acid β-cyclodextrin (CD) derivatives, were prepared by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide-assisted synthesis and characterized by nuclear magnetic resonance, Fourier transform infrared spectroscopy, thermal gravimetric analysis, X-ray power diffraction, and scanning electron microscopy. Cytotoxicity and moisture absorption of the pendant polymers were also tested. Compared with ε-PL, all the pendant polymers exhibited lower moisture absorption and cytotoxicity. The synthesis method of the pendant polymers is simple, feasible, and has good practicability. We suggest these polymers have potential applications in many fields, especially in gene delivery vector and drug delivery systems. © 2017 Taylor & Francis


Dai J.-Q.,Kunming University of Science and Technology
Journal of Magnetism and Magnetic Materials | Year: 2017

The improper ferroelectricity of CaMn7O12 is studied by examining the influence of the orientation angle of Mn3 spins on the basis of first-principles density functional theory. We analyze the helicoidal magnetic order induced forces, ionic displacements, and polarization contributions from both atomic and mode- decomposition viewpoints. Our work unambiguously reveals the critical role of the orientation angle of Mn3 spins in determining the improper ferroelectricity of CaMn7O12. The ferroelectric polarization can be reversed by changing the orientation angle of Mn3 spins without switching spin chirality of the helicoidal magnetic order. We demonstrate that the particular helicoidal magnetic order induces remarkable mismatch of the Born effective charges with the lattice symmetry, which leads to the dominant contribution to ferroelectric polarization from purely Raman-type ionic displacements. However, this significant polarization contribution from the purely Raman-type distortion cannot survive in the absence of IR-active ionic displacements. © 2016 Elsevier B.V.


Li J.,Kunming University of Science and Technology | Aswani Kumar C.,Vellore Institute of Technology | Mei C.,Xi'an Jiaotong University | Wang X.,Shenzhen University
International Journal of Approximate Reasoning | Year: 2017

In formal concept analysis, many reduction methods have recently been proposed for formal decision contexts, and each of them was to reduce formal decision contexts with a particular purpose. However, little attention has been paid to the comparison of their differences from various aspects. In fact, this problem is very important because it can provide evidence to select an appropriate reduction method for a given specific case. To address this problem, our study mainly focuses on clarifying the relationship among the existing reduction methods in formal decision contexts. Firstly, we give a rule-based review of the existing reduction methods, revealing the type of rules that each of them can preserve. Secondly, we analyze the relationship among the consistencies introduced by the existing reduction methods. More specifically, Wei's first consistency (see [39]) is stronger than others, while her second one is weaker than the remainder except Wu's consistency (see [43]). Finally, we make a comparison of the existing reductions, concluding that Li's reduction (see [14]) maintaining the non-redundant decision rules of a formal decision context is coarser than others. The results obtained in this paper are beneficial for users to select an appropriate reduction method for meeting their requirements. © 2016 Elsevier Inc.


Li X.,Kunming University of Science and Technology | Sun J.,LaoBoYunTang Medicine Co. | Hu S.,Kunming Medical University
Wiener Klinische Wochenschrift | Year: 2017

Summary: Background: It has been shown that caveolin-1 plays a potential role as a diagnostic and prognostic biomarker in various cancer types. The aim of the present study was to clarify whether caveolin-1 expressed in the breast cancer stroma could be a prognostic factor for breast cancer patients. Summary: Methods: We searched the PubMed, ScienceDirect and Web of Science databases for published literature investigating associations between stromal caveolin-1 expression and survival outcome in breast cancer patients. With respect to survival outcomes, the pooled hazard ratios (HRs) of caveolin-1 and the 95% confidence intervals (CI) were calculated. Summary: Results: Our meta-analysis identified a total of 10 studies involving 2072 cases. Further investigation demonstrated that a lack of caveolin-1 expression in the breast cancer stroma is a hazard for overall survival (OS) (HR = 2.33, 95% CI: 1.57–3.46) and disease-free/progression-free survival (DFS/PFS) (HR = 3.05, 95% CI: 2.26–4.12) in breast cancer patients. Moreover, lack of caveolin-1 expression in the cancer-associated fibroblasts was a significant predictor of DFS/PFS (HR = 2.79, 95% CI: 1.75–4.46). Summary: Conclusion: Our results indicated that lack of expression of caveolin-1 in the breast cancer stroma is associated with a poor prognosis. © 2017 Springer-Verlag Wien


Lei X.,Kunming University of Science and Technology | Xu B.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | Guo X.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2017

A novel method, using calcium chloride bihydrate (CaCl2·2H2O and TiO2) as raw materials, to synthesize crystalline calcium titanate (CaTiO3) has been investigated by thermodynamic calculation and X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetric-thermogravimetric analysis (DSC-TG), high resolution transmission electron microscopy (HR-TEM) etc. Using XRD technique analyzed experimental results revealed success of thermal sintering process, in which the mass ratio of M CaCl2·2H2O/MTiO2 = 2:1, holding temperature of 1073 K, preservation time 2 h, could be used to produce crystalline CaTiO3 powders. Ratio of Ca/Ti/O = 1:1:3 was verified by EDS pot-scan. According to SEM observation, the crystalline CaTiO3 powders are mainly composed of many separated particles with average size approximately 10 μm and have been demonstrated a strongly faceted morphology. The lattice plane, (112) is clearly observed in the HR-TEM micrograph and the lattice distance was measured as 0.27 nm. © 2016 Elsevier B.V.


Wang S.,Kunming University of Science and Technology | Yan C.,Kunming University of Science and Technology
IEICE Transactions on Communications | Year: 2017

In this work, we study efficient scheduling with network coding in a scalable video coding (SVC) multicast system. Transmission consists of two stages. The original SVC packets are multicasted by the server in the first stage and the lost packets are retransmitted in the second stage. With deadline constraint, the consumer can be only satisfied when the requested packets are received before expiration. Further, the hierarchical encoding architecture of SVC introduces extra decoding delay which poses a challenge for providing acceptable reconstructed video quality. To solve these problems, instantly decodable network coding is applied for reducing the decoding delay, and a novel packet weighted policy is designed to better describe the contribution a packet can make in upgrading the recovered video quality. Finally, an online packet scheduling algorithm based on the maximal weighted clique is proposed to improve the delay, deadline miss ratio and users' experience. Multiple characteristics of SVC packets, such as the packet utility, the slack time and the number of undelivered/wanted packets, are jointly considered. Simulation results prove that the proposed algorithm requires fewer retransmissions and achieves lower deadline miss ratio. Moreover, the algorithm enjoys fine recovery video quality and provides high user satisfaction. Copyright © 2017 The Institute of Electronics, Information and Communication Engineers.


Yin Y.,Kunming University of Science and Technology | Cheng T.C.E.,Hong Kong Polytechnic University | Wang D.-J.,Dalian Maritime University | Wang D.-J.,Hefei University of Technology | And 2 more authors.
Journal of Scheduling | Year: 2017

We consider the scheduling problem in which two agents (agents A and B), each having its own job set (containing the A-jobs and B-jobs, respectively), compete to process their own jobs in a two-machine flowshop. Each agent wants to maximize a certain criterion depending on the completion times of its jobs only. Specifically, agent A desires to maximize either the weighted number of just-in-time (JIT) A-jobs that are completed exactly on their due dates or the maximum weight of the JIT A-jobs, while agent B wishes to maximize the weighted number of JIT B-jobs. Evidently four optimization problems can be formulated by treating the two agents’ criteria as objectives and constraints of the corresponding optimization problems. We focus on the problem of finding the Pareto-optimal schedules and present a bicriterion analysis of the problem. Solving this problem also solves the other three problems of bicriterion scheduling as a by-product. We show that the problems under consideration are either polynomially or pseudo-polynomially solvable. In addition, for each pseudo-polynomial-time solution algorithm, we show how to convert it into a two-dimensional fully polynomial-time approximation scheme for determining an approximate Pareto-optimal schedule. Finally, we conduct extensive numerical studies to evaluate the performance of the proposed algorithms. © 2017 Springer Science+Business Media New York


Li H.,Kunming University of Science and Technology | Qiu H.,Kunming University of Science and Technology | Yu Z.,Kunming University of Science and Technology | Li B.,Kunming University of Science and Technology
Signal Processing | Year: 2017

In multifocus image fusion, accurate detection of the focused pixel from source images is crucial to improve the quality of fused result. Traditionally, the method developed in spatial domain is commonly used. However, such approaches tend to produce boundary seams or distortions. To this end, we propose a new fixed window technique of multiscale image analysis (MIA) and a new weighted fusion strategy by employing non-local means filtering (NLF). This new scheme consists of three parts: detection of focused pixel, correction of detecting results, and generation of fusion weight maps for source images. To improve detection robustness against the size of object, we develop the fixed window technique of MIA to detect the focused pixels, and then we construct the initial fusion decision map for each of source images by combining those detection results; second, we present a new refining process based on block consistency evaluation for correcting the initial detection result. At last, the corresponding source images are used as a guide and combined with the NLF to produce the fusion weight maps. Experimental results demonstrate that the performance of our approach is superior to that of many state-of-the-art algorithms in terms of both visual perception and objective evaluation. © 2017 Elsevier B.V.


Tao T.,Kunming University of Science and Technology | Zhang Y.,Kunming University of Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

The scale-invariant feature transform (SIFT) algorithm is devised to detect keypoints via the difference of Gaussian (DoG) images. However, the DoG data lacks the high-frequency information, which can lead to a performance drop of the algorithm. To address this issue, this paper proposes a novel log-polar feature detector (LPFD) to detect scale-invariant blubs (keypoints) in log-polar space, which, in contrast, can retain all the image information. The algorithm consists of three components, viz. keypoint detection, descriptor extraction and descriptor matching. Besides, the algorithm is evaluated in detecting keypoints from the INRIA dataset by comparing with the SIFT algorithm and one of its fast versions, the speed up robust features (SURF) algorithm in terms of three performance measures, viz. correspondences, repeatability, correct matches and matching score. © 2017 SPIE.


Huang A.,Kunming University of Science and Technology | Yang Z.,Kunming University of Science and Technology | Yu C.,Kunming University of Science and Technology | Chai Z.,Kunming University of Science and Technology | And 2 more authors.
Journal of Physical Chemistry C | Year: 2017

White or tunable photoluminescence of phosphors is of great significance for their practical applications in the light-emitting diodes. In this work, Ba2Y(BO3)2Cl:Bi3+,Eu3+ phosphors were fabricated, and their photoluminescence properties were investigated. Three difference luminescence peaks located at 366, 410, and 490 nm were observed in the single Bi3+-doped Ba2Y(BO3)2Cl phosphor under the excitation of ultraviolet light attributed to three various Bi3+ sites occupied in the Ba2Y(BO3)2Cl host. By tuning the excitation wavelength from three various Bi3+ sites, the tunable luminescence properties were obtained. The energy transfer from Bi3+ at various sites to Eu3+ were observed in the Ba2Y(BO3)2Cl:Bi3+,Eu3+ phosphors by an electric dipole-dipole interaction. The tunable and white luminescence was obtained by changing the Eu3+ concentration or excitation wavelength. The light-emitting diodes with the white light emission were constructed by coupling Bi3+ and Eu3+ codoped Ba2Y(BO3)2Cl phosphors with the UV chip, which indicated that the Bi3+ and Eu3+ codoped Ba2Y(BO3)2Cl phosphors can act as a promising candidate for the UV converted WLEDs. (Graph Presented). © 2017 American Chemical Society.


Bai B.,North China University of Water Conservancy and Electric Power | Zhang L.,Kunming University of Science and Technology
Shock and Vibration | Year: 2017

In order to identify the quadratic Volterra system simplified from the hydroturbine shaft system, a blind identification method based on the third-order cumulants and a reversely recursive method are proposed. The input sequence of the system under consideration is an unobservable independent identically distributed (i.i.d.), zero-mean and non-Gaussian stationary signal, and the observed signals are the superposition of the system output signal and Gaussian noise. To calculate the third-order moment of the output signal, a computer loop judgment method is put forward to determine the coefficient. When using optimization method to identify the time domain kernels, we combined the traditional optimization algorithm (direct search method) with genetic algorithm (GA) and constituted the hybrid genetic algorithm (HGA). Finally, according to the prototype observation signal and the time domain kernel parameters obtained from identification, the input signal of the system can be gained recursively. To test the proposed method, three numerical experiments and engineering application have been carried out. The results show that the method is applicable to the blind identification of the hydroturbine shaft system and has strong universality; the input signal obtained by the reversely recursive method can be approximately taken as the random excitation acted on the runner of the hydroturbine shaft system. © 2017 Bing Bai and Lixiang Zhang.


Peng Z.-J.,Kunming University of Science and Technology | Peng J.-L.,Kunming University of Science and Technology | Jiang Y.-X.,Kunming University of Science and Technology
Proceedings - 2016 International Conference on Robots and Intelligent System, ICRIS 2016 | Year: 2016

With the development of Internet technology and the explosive increase of network information, how to extract specific and useful information in an automatic or semiautomatic way become a problem. There is a large number of different forms of bilingual corpus and different quality on the Internet. How to extract a large number of high quality corpus from the Internet has become a more and more important issue. In this paper, firstly, based on the support vector machine, the bilingual network filtering is studied, and the information extraction of bilingual resources is studied. Secondly, a bilingual resources mining system based on Web data is established. Finally, the proposed system implementation of the bilingual mining method shows the visual mode of the experimental results. It includes text search, web browsing, the user to add, specify the page of the extraction and the user's seed selection and other functions. This system is a complete user oriented program. © 2016 IEEE.


He W.-W.,Kunming University of Science and Technology | Qu G.-F.,Kunming University of Science and Technology | Zhao Q.,Kunming University of Science and Technology | Li X.-F.,Kunming University of Science and Technology
Key Engineering Materials | Year: 2017

Magnetic Ionic liquids are a class of functional ionic liquids with magnetic. Because of outstanding thermal stability, excellent electrochemical properties, good solubility and recyclability, it has broad application prospects in catalysis, separation extraction, material synthesis and other fields. The main applications of magnetic ionic liquids in recent years are reviewed especially in the field of magnetic separation and catalytic. It shows a huge advantage that can highly efficiently catalyze myriads of reactions, and can be recovered and reused by a magnetic field. With the further research of magnetic ionic liquids, it is believed that the magnetic ionic liquid will be applied in more fields. © 2017 Trans Tech Publications.


Xu Z.-C.,Kunming University of Science and Technology | Feng Z.-X.,Kunming University of Science and Technology | Dong J.-L.,Kunming University of Science and Technology
Key Engineering Materials | Year: 2017

The effects of Sm and Zr amount on the properties of Mg-Cu-Sm-Zr alloys were systematically investigated. The results showed that the Mg99Cu alloy consist ofα -Mg matrix and Mg2Cu phase. After the addition of Sm and Zr, it was confirmed that Sm and Zr change the structure and distribution of Mg2Cu phase. In the meantime, the CuZr2 and CuSm phases which make a major contribution to mechanical properties were observed in the Mg-Cu-Sm-Zr alloys. The addition of Sm and Zr can also greatly refine the grains. The strength continuously increased due to the increase of Sm and Zr content. The elongation first increased within the range of 0-1.5%Sm 0-0.9%Zr, and the decreased. The alloys with 0.5wt%Sm and 1.9wt%Zr had the best combination of mechanical properties. © 2017 Trans Tech Publications.


Wang X.,Kunming University of Science and Technology | Wang A.,Kunming University of Science and Technology | Ma J.,Harbin Institute of Technology | Fu M.,Chinese Institute of Urban Environment
Chemosphere | Year: 2017

For the first time, an integrated green technology by coupling functional nanoscale zero-valent iron (NZVI) with ultrasound (US) was innovatively developed for the enhanced decolorization of malachite green (MG) and methylene blue (MB). The functional NZVI (TP-Fe) was successfully fabricated via a facile, one-step and environmentally-benign approach by directly introducing high pure tea polyphenol (TP), where TP contenting abundant epicatechin was employed as reductant, dispersant and capping agent. Note that neither additional extraction procedure nor protection gas was needed during the entire synthesis process. Affecting factors (including US frequency, initial pH, dye concentration, and reaction temperature) were investigated. Results show that TP-Fe exhibited enhanced activity, antioxidizability and stability over the reaction course, which could be attributed to the functionalization of TP on NZVI and the invigorating effect of US (i.e., improving the mass transfer rate, breaking up the aggregates of TP-Fe nanoparticles, and maintaining the TP-Fe surface activity). The kinetics for MG and MB decolorization by the TP-Fe/US system could be well described by a two-parameter pseudo-first-order decay model, and the activation energies of MG and MB decolorization in this new system were determined to be 21 kJ mol−1 and 24 kJ mol−1, respectively. In addition, according to the identified reaction products, a possible mechanism associated with MG and MB decolorization with the TP-Fe/US system was proposed. © 2016 Elsevier Ltd


Jin B.-J.,Kunming University of Science and Technology | Zhang Y.-H.,Kunming University of Science and Technology | Gao K.-P.,Kunming University of Science and Technology | Wang C.-Y.,University of Science and Technology Beijing
Key Engineering Materials | Year: 2017

This work presents investigations on preparation of 20 wt. % Pt0.5Pd0.5/C nanoelectrocatalysts by electroless and their electrocatalytic properties. The 20 wt. % Pt0.5Pd0.5/C nanoelectrocatalysts were prepared by electroless successfully. The optimum experimental conditions of the main effect factors in preparing the PtPd nanoelectrocatalysts are [Pt2+ or Pd2+] =2-10g/L, [HCHO] =10-20g/L, temperature: 40-60°C, the dosage of protection reagent: 1-3 % of the platinum and palladium content, the agitation rate 400-500r/min. The characterization of 20 wt. % Pt0.5Pd0.5/C was performed with cyclic voltammetry (CV) and transmission electron microscope (TEM), respectively. Particles of PtPd are distributed symmetrically on C by TEM, of which are very small and the average granularity is less than 3nm. The nanoelectrocatalysts have high stabilization and lots of catalysis nuclei through CV. © 2017 Trans Tech Publications.


Sun L.,Kunming University of Science and Technology | Guo Y.,Kunming University of Science and Technology | Zhang Y.,Kunming University of Science and Technology | Zhuang Y.,Kunming University of Science and Technology
Frontiers in Pharmacology | Year: 2017

Rape bee pollen possesses many nutritional and therapeutic properties because of its abundant nutrimental and bioactive components. In this study, free (FPE) and bound (BPE) phenolic extracts of rape bee pollen were obtained, phenolic and flavonoid contents were determined, and composition of phenolic acids was analyzed. In vitro antioxidant and anti-tyrosinase (TYR) activities of FPE and BPE were compared, and inhibitory melanogenesis of FPE was further evaluated. Results showed FPE and BPE contain total phenolic contents of 11.76 and 0.81 mg gallic acid equivalents/g dry weight (DW) and total flavonoid contents of 19.24 and 3.65 mg rutin equivalents/g DW, respectively. Phenolic profiling showed FPE and BPE fractions contained 12 and 9 phenolic acids, respectively. FPE contained the highest rutin content of 774.87 μg/g. FPE and BPE showed the high antioxidant properties in vitro and high inhibitory activities for mushroom TYR. Higher activities of FPE than those of BPE can be attributed to difference in their phenolic compositions. Inhibitory melanogenesis activities of FPE against B16 were further evaluated. Results showed suppressed intracellular TYR activity, reduced melanin content, and promoted glutathione synthesis (p < 0.05) in FPE-treated cells. FPE reduced mRNA expression of TYR, TYR-related protein (TRP)-1 and TRP-2, and significantly suppressed cyclic adenosine monophosphate (cAMP) levels through down-regulation of melanocortin 1 receptor gene expression (p < 0.05). FPE reduced mRNA expression of microphthalmia-associated transcription factor (MITF), significantly inhibiting intracellular melanin synthesis (p < 0.05). Hence, FPE regulates melanogenesis of B16 cells involved in cAMP/MITF/TYR pathway. These results revealed that FPE can be used as pharmaceutical agents and cosmetics to protect cells from abnormal melanogenesis. © 2017 Sun, Guo, Zhang and Zhuang.


Wu K.,Nanyang Technological University | Zhao N.,Kunming University of Science and Technology
Proceedings - Winter Simulation Conference | Year: 2017

Queueing models can be used to evaluate the performance of manufacturing systems. Due to the emergence of cluster tools in contemporary production systems, proper queueing models have to be derived to evaluate the performance of machines with complex configurations. Job cascading is a common structure among cluster tools. Because of the blocking and starvation effects among servers, queue time analysis for a cluster tool with job cascading is difficult in general. Based on the insight from the reduction method, we proposed the approximate model for the mean queue time of a cascading machine subject to breakdowns. The model is validated by simulation and performs well in the examined cases. © 2016 IEEE.


Lv J.,Kunming University of Science and Technology | Fu Y.,Kunming University of Science and Technology
Proceedings - 12th International Conference on Computational Intelligence and Security, CIS 2016 | Year: 2016

Quantile regression model estimates the relationship between covariates and the quantile of a response distribution, rather than the mean. This method has been utilized successfully in several fields such as linear models, random effect models, generalized linear models and semiparametric/nonparametric model etc. However, most of the literature have been developed under the assumption that the responses are continuous and the Bayesian quantile regression for count data needs more exploration. In this paper, we present Bayesian regularized quantile regression model for count data and apply it to the study of Youth Fitness Survey. We also compare the results of quantile regression from the common modeling strategy such as Poisson and negative binomial regression. From the results, we observe that Bayesian quantile regression is more flexible and reasonable in the sense that it provide more information about parameter estimation than ordinary regression. © 2016 IEEE.


Cheng Y.,Kunming University of Science and Technology | Liu Z.,Kunming University of Science and Technology
Proceedings - 12th International Conference on Computational Intelligence and Security, CIS 2016 | Year: 2016

With people's pursuit of high quality image, image denoising has always been a popular research. The traditional image denoising method is based on wavelet transform threshold. The denoising effect is good, but is prone to lose the image structure and texture information. Based on the deficiency of the traditional denoising method, this paper put forward a method that is based on morphological component analysis (MCA) to decomposes an image into texture and structure. The part of texture uses all phase biorthogonal transform(APBT) dictionary sparse representation to denoise. the part of the structure uses Block-Matching and 3-D Filtering (BM3D) algorithm to denoise. Finally, combined with the two parts to get the final denoising image. Experimental result show that compared with the traditional wavelet threshold denoising, this paper's algorithm can better retain the image details and structure information, it can get better denoising performance in PSNR. © 2016 IEEE.


Zhuang Y.,Kunming University of Science and Technology | Ma Q.,Kunming University of Science and Technology | Guo Y.,Kunming University of Science and Technology | Sun L.,Kunming University of Science and Technology
Food and Chemical Toxicology | Year: 2017

Rambutan peel phenolic (RPP) extracts were prepared via dynamic separation with macroporous resin. The total phenolic content and individual phenolics in RPP were determined. Results showed that the total phenolic content of RPP was 877.11 mg gallic acid equivalents (GAE)/g extract. The content of geranin (122.18 mg/g extract) was the highest among those of the 39 identified phenolic compounds. RPP protected against oxidative stress in H2O2-induced HepG2 cells in a dose-response manner. The inhibitory effects of RPP on cell apoptosis might be related to its inhibitory effects on the generation of intracellular reactive oxygen species and increased effects on superoxide dismutase activity. The in vivo anti-aging activity of RPP was evaluated using an aging mice model that was induced by d-galactose (d-gal). The results showed that RPP enhanced the antioxidative status of experimental mice. Moreover, histological analysis indicated that RPP effectively reduced d-gal-induced liver and kidney tissue damage in a dose-dependent manner. Therefore, RPP can be used as a natural antioxidant and anti-aging agent in the pharmaceutical and food industries. © 2017 Elsevier Ltd.


Gao S.,Kunming University of Science and Technology | Yang X.,Kunming University of Science and Technology | Yu Z.,Kunming University of Science and Technology | Pan X.,Kunming University of Science and Technology | Guo J.,Kunming University of Science and Technology
International Journal of Machine Learning and Cybernetics | Year: 2017

To make use of the syntactic characteristic of Naxi language effectively, in this paper, a Chinese-Naxi machine translation method based on Naxi dependency language model is proposed. The method, firstly, makes dependency parsing on the Chinese sentence, and extracts Chinese-Naxi dependency tree-to-string translation templates. Secondly, it decodes Naxi Sentence by using the templates, and generates n-best candidate sentences. Thirdly, it makes dependency parsing on each of the candidate Naxi sentences, and obtains a node sequence corresponding to the dependency relationships. Finally, it builds a Naxi dependency language model, with the help of the model, calculates and reorders each node from the sequence, and selects the final target sentence. The comparative experiments, on the proposed method, the existing tree-to-string translating method, Bruin and Mo-tse, show that the Chinese-Naxi machine translation method combined with the Naxi dependency language model can improve the translating accuracy effectively, and its BLEU-2 increases by 2 point than without the Naxi dependency language model. © 2015, Springer-Verlag Berlin Heidelberg.


Zhao Y.,Kunming University of Science and Technology | Li J.,Kunming University of Science and Technology | Liu W.,Kunming University of Science and Technology | Xu W.,Chongqing University of Technology | Xu W.,Zhejiang Ocean University
International Journal of Machine Learning and Cybernetics | Year: 2017

Cognitive concept learning is to learn concepts from a given clue by simulating human thought processes including perception, attention and thinking. In recent years, it has attracted much attention from the communities of formal concept analysis, cognitive computing and granular computing. However, the classical cognitive concept learning approaches are not suitable for incomplete information. Motivated by this problem, this study mainly focuses on cognitive concept learning from incomplete information. Specifically, we put forward a pair of approximate cognitive operators to derive concepts from incomplete information. Then, we propose an approximate cognitive computing system to perform the transformation between granular concepts as incomplete information is updated periodically. Moreover, cognitive processes are simulated based on three types of similarities. Finally, numerical experiments are conducted to evaluate the proposed cognitive concept learning methods. © 2016, Springer-Verlag Berlin Heidelberg.


Singh P.K.,Vellore Institute of Technology | Cherukuri A.K.,Vellore Institute of Technology | Li J.,Kunming University of Science and Technology
International Journal of Machine Learning and Cybernetics | Year: 2017

In this paper we propose a method for reducing the number of formal concepts in formal concept analysis of data with fuzzy attributes. We compute the weight of fuzzy formal concepts based on Shannon entropy. Further, the number of fuzzy formal concepts is reduced at chosen granulation of their computed weight. We show that the results obtained from the proposed method are in good agreement with Levenshtein distance method and interval–valued fuzzy formal concepts method but with less computational complexity. © 2014, Springer-Verlag Berlin Heidelberg.


Kang Y.,Kunming University of Science and Technology
Reviews in Medical Microbiology | Year: 2017

Depression is a common mental disorder, which can be long lasting or recurrent, substantially impairing an individualʼs ability to function in their daily life. The complex interplay of biological, genetic, and environmental factors is important on the development of the disease. Accumulating evidence shed light on the association of dysbiosis of gut microbiota with depression. Gut microbiota may play an important role in central nervous system function, namely through inflammation, and the hypothalamic–pituitary–adrenal axis, and by affecting neurotransmission. Certain gut microbial strains have been shown to may play either a pathogenic or protective role in the development of depression. Oral intake of probiotics/prebiotic can, therefore, represent a therapeutic approach for depression treatment. However, the relevant scientific work has only just begun, and the available data in this field remain limited. Fortunately, utilization of new sequencing technologies allows the attempt to an expanded research on the association of intestinal bacterial flora and human diseases. In this review, we summarize the role of gut microbiota in depression progression. Probiotics/prebiotic in the treatment of depression was also discussed in other threads. Copyright © Wolters Kluwer Health, Inc. All rights reserved.


Zhang Y.,Kunming University of Science and Technology | Zhou S.,Kunming University of Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

The 1-D mapping is an intensity-based method used to estimate a projective transformation between two images. However, it lacks an intensity-invariant criterion for deciding whether two images can be aligned or not. The paper proposes a novel decision criterion and, thus, develops an error-detective 1-D mapping method. First, a multiple 1-D mapping scheme is devised for yielding redundant estimates of an image transformation. Then, a voting scheme is proposed for verifying these multiple estimates, in which at least one estimate without receiving all the votes is taken as a decision criterion for false-match rejection. Based on the decision criterion, an error-detective 1-D mapping algorithm is also constructed. Finally, the proposed algorithm is evaluated in registering real image pairs with a large range of projective transformations. © 2017 SPIE.


Huang C.,Kunming University of Science and Technology | Li J.,Kunming University of Science and Technology | Mei C.,Xi'an Jiaotong University | Wu W.-Z.,Zhejiang Ocean University
International Journal of Approximate Reasoning | Year: 2017

The theory of three-way decisions is to consider a decision-making problem as a ternary classification one which is realized by the acceptance, rejection and non-commitment. Recently, this theory has been integrated with formal concept analysis in two different ways: constructive and axiomatic methods. The constructive method is to define certain three-way concepts in a formal context to support three-way concept analysis, while the axiomatic one is to characterize general three-way concepts by axioms so as to perform three-way concept learning. Nevertheless, there are similarities between the constructive and the axiomatic methods. In fact, both three-way concept analysis induced by the constructive method and three-way concept learning induced by the axiomatic one are realized by incorporating the idea of ternary classification into the design of extent or intent of a concept. However, their information fusion abilities need to be improved since neither of them is able to deal with large or multi-source data effectively. Motivated by this problem, our paper is to reconsider three-way concept learning based on cognitive operators from the perspective of information fusion. That is, the parallel computing techniques of learning three-way concepts are developed for large and multi-source data. Specifically, for large data, the relationship between the global granular concept and the local ones is first clarified, and then it is employed to design an information fusion algorithm. For multi-source data, the whole evaluation function used to induce three-way decisions is established by aggregating the results obtained in each single-source data, and three-way concept learning is made by constructing lower and upper approximation concepts. Finally, we conduct some numerical experiments to evaluate the effectiveness of the proposed parallel computing algorithms. © 2017 Elsevier Inc.


Li F.,Kunming University of Science and Technology | Yi J.,Kunming University of Science and Technology | Eckert J.,Erich Schmid Institute of Materials Science
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2017

Powder-forged connecting rod with a complex geometry shape always has a problem with nonuniform density distribution. Moreover, the physical property of preform plays a critical role for optimizing the connecting rod quality. The flow behavior of a Fe-3Cu-0.5C (wt pct) alloy with a relative density of 0.8 manufactured by powder metallurgy (P/M, Fe-Cu-C) was studied using isothermal compression tests. The material constitutive equation, power dissipation (η) maps, and hot processing maps of the P/M Fe-Cu-C alloy were established. Then, the hot forging process of the connecting rod preforms was simulated using the material constitutive model based on finite element method simulation. The calculated results agree well with the experimental ones. The results show that the flow stress increases with decreasing temperature and increasing strain rate. The activation energy of the P/M Fe-Cu-C alloy with a relative density of 0.8 is 188.42 kJ/mol. The optimum temperature at the strain of 0.4 for good hot workability of sintered Fe-Cu-C alloy ranges from 1333 K to 1380 K (1060 °C to 1107 °C). The relative density of the hot-forged connecting rod at the central part changed significantly compared with that at the big end and that at the small end. These present theoretical and experimental investigations can provide a methodology for accurately predicting the densification behavior of the P/M connecting rod preform during hot forging, and they help to optimize the processing parameters. © 2017 The Minerals, Metals & Materials Society and ASM International


Liu Z.J.,Kunming University of Science and Technology | Lan T.Q.,Kunming University of Science and Technology | Li H.,Kunming University of Science and Technology | Gao X.,Kunming University of Science and Technology | Zhang H.,Kunming University of Science and Technology
Bioresource Technology | Year: 2017

The effect of sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL) on composition, structure, enzymatic hydrolysis and cellulase adsorption profiles of sugarcane bagasse (SCB) was investigated. SPORL gave a higher SCB hydrolysis yield (85.33%) compared to dilute acid pretreatment (DA) (64.39%). The SEM pictures showed that SPORL SCB structure became more disordered and looser, suggesting SPORL SCB was more accessible to cellulase. The zeta potential of SPORL SCB suspension (−21.89 mV) was significantly different from that of DA SCB (−12.87 mV), which demonstrated the lignin in SPORL SCB was more hydrophilic. With regard to cellulase adsorption profiles, SPORL SCB had a lower non-productive adsorption (14.87 mg/g lignin) and a higher productive adsorption (37.67 mg/g carbohydrate) compared with DA SCB (17.05 mg/g lignin; 25.79 mg/g carbohydrate). These results indicated that SPORL SCB had better accessibility to cellulase and the higher productive cellulase adsorption of SPORL SCB had improved hydrolysis. © 2016 Elsevier Ltd


He L.,Kunming University of Science and Technology | Huang S.,Kunming University of Science and Technology
Neurocomputing | Year: 2017

In this paper, a modified firefly algorithm (MFA) is proposed to find the optimal multilevel threshold values for color image. Kapur's entropy, minimum cross entropy and between-class variance method is used as the objective functions. To test and analyze the performance of the MFA algorithm, the presented method are tested on ten test color image and the results are compared with basic firefly algorithm (FA), Brownian search based firefly algorithm (BFA) and Lévy search based firefly algorithm (LFA). The experimental results show that the presented MFA algorithm outperforms all the other algorithms in term of the optimal threshold value, objective function, PSNR, SSIM value and convergence. In MFA algorithm, chaotic map is used to the initialization of firefly population, which can enhance the diversification. In addition, global search method of particle swarm optimization (PSO) algorithm is introduced into the movement phase of fireflies. Compared with the other methods, the MFA algorithm is an effective method for multilevel color image thresholding segmentation. © 2017 Elsevier B.V.


Chen L.,Kunming University of Science and Technology | Liu W.,Kunming University of Science and Technology | Zeng J.,Kunming University of Science and Technology | Ren P.,Kunming University of Science and Technology
Powder Technology | Year: 2017

Pulsating high gradient magnetic separation (HGMS) achieves high separation efficiency to fine weakly magnetic minerals with a rod matrix. In practice, the matrix is made of numerous cylindrical wires, so that an insight into the magnetic capture of single wires to magnetic minerals would provide a crucial foundation for the analysis, design and choice of matrix. In the investigation, the magnetic capture of single wires to ilmenite minerals and its dependence on the key parameters of a pilot-scale pulsating HGMS separator, i.e., magnetic induction, pulsating frequency and feed velocity, is investigated using an innovatively experimental method. It is found that these parameters have significant effects on the magnetic capture of single wires; the mass weight of magnetic particles captured onto the wires increases with increase in magnetic induction, and it is opposite for pulsating frequency and feed velocity. The cylindrical wire captures more particles than that of rectangular one, due to its larger capture area, and it has a stronger adaptability to variations in the parameters. The single wire captures more magnetic particles but a greatly reduced stability to the parameters’ variation, compared to the multi-wires. This experimental method provides a new perspective in the understanding of magnetic capture to magnetic particles in a HGMS process, contributing to the optimal design of matrix and to the improvement of HGMS performance. © 2017 Elsevier B.V.


Lifeng K.,Kunming University of Science and Technology | Pan N.,Kunming University of Science and Technology | Yi Z.,Kunming University of Science and Technology
2016 IEEE International Conference on Information and Automation, IEEE ICIA 2016 | Year: 2016

In this paper, acoustic fault diagnosis method based on frequency domain blind deconvolution was used to separate different sources of error characteristic signal from the mixed acoustic signal collected in microphone. Sliding window short time Fourier transform (STFT) is used to convert time domain convolution mixture model into a instantaneous frequency domain mixture model, and Improved complex fixed-point algorithms is used for the blind separation process of complex signals of the same frequency. Kullback-Leibler (KL) distance is calculated to solve order uncertainty from the blind source separation process, then wavelet analysis is used to reconstructed separated signal details to get the final split signals. Finally, by analyzing the computer simulative signal and experiments for the test rig for rolling bearing, the effectiveness of the algorithm can be verified. © 2016 IEEE.


Wang Z.,Kunming University of Science and Technology | Guo Y.,Kunming University of Science and Technology | Wu X.,Kunming University of Science and Technology
2016 IEEE International Conference on Information and Automation, IEEE ICIA 2016 | Year: 2016

Planetary gearboxes are widely used in wind turbine, aerospace, marine and other large engineering machines. Then, the sun gear fault diagnosis is important. Due to nonstationary, modulation, and complex transmission paths, the observed vibration is more difficult to analysis. The tradition of time-domain synchronous average (TSA) is invalid for the characteristics extraction of sun gear fault. To address this issue, the windowed synchronous average originally proposed by McFadden can be employed to extract the useful components and reduce the effect of transmission paths. However, the observed vibration under varying speed conditions of rotating machinery exist the speed fluctuation, which can lead waveform distortion. An improved version of the windowed synchronous average is proposed in this paper. Firstly, the windowed time-domain signal is sampled at constant angle increments according to computed order tracking (COT), which converts the non-stationary signal in the time domain into the stationary one in the angle domain. Then, the windowed signal in angle domain was processed by synchronous average (SA). In this way, the frequency blur and waveform distortion caused by rotating speed fluctuation can be eliminated. Tests were conducted to verify the validity of the proposed method. © 2016 IEEE.


Sun Y.,Kunming University of Science and Technology | Pan N.,Kunming University of Science and Technology | Yi Z.,Kunming University of Science and Technology
2016 IEEE International Conference on Information and Automation, IEEE ICIA 2016 | Year: 2016

According to rolling bearing mixed faults extraction in complex mechanical structure, a fault detection approach based on improved sparse component analysis was proposed. The morphological filtering algorithm was firstly used to extract modulation features embedded in the observed signals and to make sure the signals meet sparsity; then the two-steps sparse component analysis (SCA) algorithm using fuzzy c-means clustering and linear programming was employed to do time-domain blind separation. Experiment using practical machine vibration signals was carried out, the result demonstrates this algorithm can be efficiently applied to rolling bearing mixed faults detection in practice. © 2016 IEEE.


Sun Y.,Kunming University of Science and Technology | Pan N.,Kunming University of Science and Technology
2016 IEEE International Conference on Information and Automation, IEEE ICIA 2016 | Year: 2016

In order to help students to master the knowledge and skills of robot-related design of mechanical structure, communication, MCU and C language programming, the experimental teaching platform of modular intelligent bipedal walking robot is designed. It is also aimed to solve the problem that conventional robot teaching equipment can only be carried out demonstration experiment. Firstly, the paper introduces the overall design idea the experiment teaching platform, then it presents the computer hardware system of that as well as the host computer interface design and specific implementation details. Finally, it proves this design's feasibilit ENGLy and superiority through experiment. © 2016 IEEE.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Chen G.,City University of Hong Kong
International Journal of Bifurcation and Chaos | Year: 2012

By using the method of dynamical systems to study the generalized PochhammerChree equations, the dynamics of traveling wave solutions are characterized under different parameter conditions. Some exact parametric representations of the traveling wave solutions are obtained. Thus, many results reported in the literature can be completed. © 2012 World Scientific Publishing Company.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Jiang L.,Kunming University of Science and Technology
International Journal of Bifurcation and Chaos | Year: 2015

In this paper, we consider a model which is a modulated equation in a discrete nonlinear electrical transmission line. By investigating the dynamical behavior and bifurcations of solutions of the planar dynamical systems, we derive all explicit exact parametric representations of solutions (including smooth solitary wave solutions, smooth periodic wave solutions, peakons, compactons, periodic cusp wave solutions, etc.) under different parameter conditions. © 2015 World Scientific Publishing Company.


Li J.,Kunming University of Science and Technology | Chen F.,Zhejiang Normal University
International Journal of Bifurcation and Chaos | Year: 2015

In this paper, we consider a model which is the modulated equation in a discrete nonlinear electrical transmission line. This model is an integrable planar dynamical system having three singular straight lines. By using the theory of singular systems and investigating the dynamical behavior, we obtain bifurcations of the phase portraits of the system under different parameter conditions. Corresponding to some special level curves, we derive possible exact explicit parametric representations of solutions (including smooth solitary wave and periodic wave solutions, periodic cusp wave solutions) under different parameter conditions. © 2015 World Scientific Publishing Company.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology
International Journal of Bifurcation and Chaos | Year: 2012

By using the method of dynamical systems and the results in [Li & Zhang, 2011] to the sixth-order Ramani equation and a coupled Ramani equation, the families of exact traveling wave solutions can be obtained. © 2012 World Scientific Publishing Company.


Shi J.,Kunming University of Science and Technology | Li S.,Kunming University of Science and Technology | Li J.,Zhejiang Normal University
Pramana - Journal of Physics | Year: 2013

By using dynamical system method, this paper considers the (2+1)-dimensional Davey-Stewartson-type equations. The analytical parametric representations of solitary wave solutions, periodic wave solutions as well as unbounded wave solutions are obtained under different parameter conditions. A few diagrams corresponding to certain solutions illustrate some dynamical properties of the equations. © Indian Academy of Sciences.


Wei X.,China Institute of Water Resources and Hydropower Research | Wei X.,Beijing Normal University | Gao B.,China Institute of Water Resources and Hydropower Research | Wang P.,Kunming University of Science and Technology | And 2 more authors.
Ecotoxicology and Environmental Safety | Year: 2015

Street dusts from Heavy Density Traffic Area, Residential Area, Educational Area and Tourism Area in Beijing, China, were collected to study the distribution, accumulation and health risk assessment of heavy metals. Cr, Cu, Zn, Cd and Pb concentrations were in higher concentrations in these four locations than in the local soil background. In comparison with the concentrations of selected metals in other cities, the concentrations of heavy metals in Beijing were generally at moderate or low levels. Ni, Cu, Zn and Pb concentrations in the Tourism Area were the highest among four different areas in Beijing. A pollution assessment by Geoaccumulation Index showed that the pollution level for the heavy metals is in the following order: Cd>Pb>Zn>Cu>Cr>Ni. The Cd levels can be considered "heavily contaminated" status. The health risk assessment model that was employed to calculate human exposure indicated that both non-carcinogenic and carcinogenic risks of selected metals in street dusts were generally in the low range, except for the carcinogenic risk from Cr for children. © 2014 Elsevier Inc.


Hu J.,Chinese Academy of Geological Sciences | Hu J.,Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources | Gong W.,Chinese Academy of Geological Sciences | Gong W.,Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources | And 4 more authors.
Precambrian Research | Year: 2014

The relationship between the Alxa block and the North China Craton (NCC) is one of the controversial tectonic issues in China. The age spectra of detrital zircons from sedimentary rocks may help resolve the tectonic affinity of the Alxa block. The Langshan terrane is located in the northeast margin of the Alxa block which is connected to the northwest margin of the NCC. Detailed U-Pb dating of zircon from the meta-volcanic rocks and meta-sedimentary rocks of the Precambrian Langshan group shows that the Langshan Group formed in the Neoproterozoic. The evidence includes the zircon age of 804.1 ± 3.5. Ma for the meta-volcanic rocks and the youngest detrital zircon age peak at 1187-810. Ma for the meta-sedimentary rocks. The detrital zircon age patterns of the Langshan group and Precambrian strata of the Alxa block and the NCC are similar. The older and younger detrital zircon age peaks of the Langshan group are comparable to those of the NCC and the Alxa block, respectively. The 1.7-1.5. Ga detrital zircons in the Langshan Group, which might be derived from the "Zhaertai-Bayan Obo-Huade" Mesoproterozoic rift system in the northern margin of the NCC, are not found in the Precambrian strata of the Alxa block. The detrital zircon age peaks of the Langshan group are well correlated to the known Precambrian tectono-thermal events that affected both the Alxa block and the NCC. The development of the Langshan Neoproterozoic rift system is shown by the contemporaneous magmatism in the Alxa block and the adjacent NCC. The results from this study indicate that the Alxa block and the NCC were together in the Neoproterozoic. © 2014 Elsevier B.V.


Zheng J.,Kunming University of Science and Technology | Zheng C.,PricewaterhouseCoopers Zhong Tian CPAs Ltd Company
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2013

Energy-intensive industries (EIIs) refer to the traditional metallurgical, chemical, building material and thermal power industry, which are the fundamental industries in China and the key fields of energy saving and emission reduction (ESER) work. EIIs in China accounts for about 70- 80% energy consumption and 80-90% three waste (waste water, waste gas and solid waste) emission of all industry. Although, lots of achievements on ESER work have been gained in construction of circular economy, huge challenges and tough situations are expected. Research on it will improve reaching the goal of energy consumption reducing and pollution controlling per unit GDP given in "twelfth five years plan" and the longer term strategies in China. Based on Chinese statistical yearbook' data, this article discusses the recent progress of ESER work, and its influence and contribution on the goals of energy consumption and three wastes emission reduction intensity. The achievements about ESDR in Chinese EIIs are summarized, problems are found and the countermeasure and suggestion to promote ESDR are given finally. © Sila Science.


Fei W.S.,Kunming University of Science and Technology | Zhang C.L.,Hubei Traffic Planning and Designing Institute | Wu Z.Q.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

The unstable failure of rock and soil slope was a progressive evolution process from local failure to total failure. The no-uniformity of rock and soil materials and differences of boundary conditions caused the discrepancy of stress field, together with the elastic-plastic characteristics of the sliding zone which controls the progressive unstable failure process. In this paper, any point of slop sliding zone was taken for the research object. On basis of limit slice method, the mechanical condition of slice was considered as a plane strain problem. According to Mohr-Coulomb linear failure criterion the stress state of a point is obtained with selecting stress function to establish the mechanical criterion of progressive slope failure. The analysis of engineering example shows that the mechanical criterion is reasonable to estimate the state of progressive slope evolution. © (2014) Trans Tech Publications, Switzerland.


Zhang L.,Kunming University of Science and Technology | Li J.,Kunming University of Science and Technology | Li J.,Zhejiang Normal University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2011

The asymptotic behavior of loop-soliton solution and periodic loop solutions is studied for the K(2,2) equation. The results show that both of them consist of two or more branches of non-smooth solutions. © 2011 Elsevier B.V. All rights reserved.


Xiao S.,Kunming University of Science and Technology | Bai J.-Y.,Shanghai University
Modern Physics Letters B | Year: 2013

In this paper, theoretical analysis and extensive simulations are used to investigate asymmetric simple exclusion processes (ASEPs) with zoned inhomogeneity and on-ramp in a single-lane system. There are five possible phase diagrams with different hopping rate p and on-ramp rate q. Interestingly, the MC/MC, MC/LD and MC/HD phase can exist in the phase diagram with different hopping rate p and on-ramp rate q. When the on-ramp rate is fixed, with the decreasing of hopping rate, the HD/HD phase shrinks, it implies the heavy traffic in the system. © 2013 World Scientific Publishing Company.


He S.,Kunming University of Science and Technology
Hydrometallurgy | Year: 2011

The pressure leaching of synthetic zinc silicate is studied in the present paper. Five key parameters were explored, namely, sulfuric acid concentration, the final pH of leaching pulp, leaching temperature, water content and iron addition. The experimental results obtained show that sulfuric acid concentration, the final pH, iron addition, water content and leaching temperature have significant effect on the leaching behavior of zinc and silica. Higher leaching temperature and final pH improved filtration characteristics of the leaching pulp. The final pH affected the co-precipitation of silica and iron (III) oxide. Once all these five parameters were optimized, the Zn extraction percentage was found to be as high as 97% and the extent of Si dissolution as low as 0.6%; the filtration rate increased to 1057 L/m 2•h. The kinetic study showed that the leaching process follows shrinking core model with diffusion control with an apparent activation energy of 16.4 kJ/mol in the temperature range of 110-170 °C. The empirical reaction order with respect to the concentration of sulfuric acid is 1.0, which is also consistent with a diffusion-controlled process. © 2011 Elsevier B.V. All rights reserved.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Chen G.,City University of Hong Kong
International Journal of Bifurcation and Chaos | Year: 2012

By using the approach of dynamical systems, the bifurcations of phase portraits for the traveling system of the KudryashovSinelshchikov equation with ν = δ = 0 are studied, in different parametric regions of (α, c)-parametric plane. Corresponding to different phase orbits of the traveling system, more than 26 exact explicit traveling wave solutions are derived. The dynamics of singular nonlinear traveling system is completely determined. © 2012 World Scientific Publishing Company.


Guo Y.,Kunming University of Science and Technology | Tan K.K.,National University of Singapore
Mechanical Systems and Signal Processing | Year: 2010

An approach for decoupling of crossing orders in Vold-Kalman filtering order tracking (VKF-OT) is proposed in this paper. In the approach, independent component analysis (ICA) is employed to decouple the disturbance orders by separating the raw mixed signals into independent components (ICs) before performing VKF-OT. Compared with the preconditioned conjugate gradient (PCG) decoupling for VKF-OT, it is efficient in computation and does not require the instantaneous frequency information of the disturbance signals. The evaluation of the approach is presented in detail based on simulations and an experiment on a rotor test rig. Both of them give positive supports to the presented approach. © 2010 Elsevier Ltd.


Wang C.,Kunming University of Science and Technology | Dai Z.,Yunnan University | Liu C.,Wenshan University
Physica Scripta | Year: 2014

In this paper, two types of multi-parameter breather homoclinic wave solutions - including breather homoclinic wave and rational homoclinic wave solutions - are obtained by using the Hirota technique and ansätz with complexity of parameter for the coupled Schrödinger-Boussinesq equation. Rogue waves in the form of the rational homoclinic solution are derived when the periods of breather homoclinic wave go to infinite. Some novel features of homoclinic wave solutions are discussed and presented. In contrast to the normal bright rogue wave structure, a structure like a four-petaled flower in temporal-spatial distribution is exhibited. Further with the change of the wave number of the plane wave, the bright and dark rogue wave structures may change into each other. The bright rogue wave structure results from the full merger of two nearby peaks, and the dark rogue wave structure results from the full merger of two nearby holes. The dark rogue wave for the uncoupled Boussinesq equation is finally obtained. Its structural properties show that it never takes on bright rogue wave features with the change of parameter. It is hoped that these results might provide us with useful information on the dynamics of the relevant fields in physics. © 2014 The Royal Swedish Academy of Sciences.


Zhu H.-L.,University of Macau | Wan J.-B.,University of Macau | Wang Y.-T.,University of Macau | Li B.-C.,Kunming University of Science and Technology | And 3 more authors.
Epilepsia | Year: 2014

Objective Epilepsy is a serious neural disease that affects around 50 million people all over the world. Although for the majority patients with epilepsy, seizures are well controlled by currently available antiepileptic drugs (AEDs), there are still >30% of patients suffered from medically refractory epilepsy and approximately 30-40% of all epileptic patients affected by numerous side effects and seizure resistance to the current AEDs. Therefore, many researchers try to develop novel approaches to treat epilepsy, for example, to discover new antiepileptic constituents from herbal medicines. Although there are already several reviews on phytotherapy in epilepsy, most of them placed emphasis on the plant crude extracts or their isolated fractions, not pure active compounds derived from herbal medicines. This article aims to review components in herbal medicines that have shown antiepileptic or anticonvulsant properties. Methods We searched online databases and identified articles using the preset searching syntax and inclusion criteria. The active medicinal compounds that have shown anticonvulsant or antiepileptic activity were included and classified according to structural types. Results We have reviewed herein the active constituents including alkaloids, flavonoids, terpenoids, saponins, and coumarins. The screening models, the seizures-inducing factors and response, the effective dose, the potential mechanisms, as well as the structure-activity relationships in some of these active components have also been discussed. Significance The in vitro and in vivo experimental data reviewed in this paper would supply the basic science evidence for research and development of novel AEDs from medicinal plants. © 2013 International League Against Epilepsy.


Liu Y.,Zhejiang Normal University | Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology
International Journal of Bifurcation and Chaos | Year: 2011

For third-order nilpotent critical points of a planar dynamical system, the problem of characterizing its center and focus is completely solved in this article by using the integral factor method. The associated quasi-Lyapunov constants are defined and their computation method is given. For a class of cubic systems under small perturbations, it is proved that there exist eight small-amplitude limit cycles created from a nilpotent critical point. © 2011 World Scientific Publishing Company.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Zhang Y.,Zhejiang Normal University
Mathematical Methods in the Applied Sciences | Year: 2011

By using the method of bifurcation theory of planar dynamical systems to the traveling wave system of the (2+1)-dimensional Boiti-Leon-Pempinelle system, exact explicit parametric representations of the traveling wave solutions are obtained in different parameter regions. © 2010 John Wiley & Sons, Ltd.


Nie L.,Kunming University of Science and Technology | Yu L.,Kunming University of Science and Technology | Zheng Z.,Beijing Normal University | Shu C.,Kunming University of Science and Technology
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

Heat conduction of symmetric Frenkel-Kontorova (FK) lattices with a coupling displacement was investigated. Through simplifying the model, we derived analytical expression of thermal current of the system in the overdamped case. By means of numerical calculations, the results indicate that: (i) As the coupling displacement d equals to zero, temperature oscillations of the heat baths linked with the lattices can control magnitude and direction of the thermal current; (ii) Whether there is a temperature bias or not, the thermal current oscillates periodically with d, whose amplitudes become greater and greater; (iii) As d is not equal to zero, the thermal current monotonically both increases and decreases with temperature oscillation amplitude of the heat baths, dependent on values of d; (iv) The coupling displacement also induces nonmonotonic behaviors of the thermal current vs spring constant of the lattice and coupling strength of the lattices; (v) These dynamical behaviors come from interaction of the coupling displacement with periodic potential of the FK lattices. Our results have the implication that the coupling displacement plays a crucial role in the control of heat current. © 2013 American Physical Society.


Zhao L.,Kunming University of Science and Technology | Zhao X.,Kunming General Hospital of Chengdu Military Command | Wu X.,Kunming University of Science and Technology | Tang W.,Kunming University of Science and Technology
Genetic Testing and Molecular Biomarkers | Year: 2013

Background: The p53 tumor suppressor gene Arg72Pro polymorphism has been associated with esophageal cancer. However, the results were not consistent. Herein, this meta-analysis was performed to estimate the association between p53 Arg72Pro polymorphism and esophageal cancer. Methods: Electronic search of PubMed was conducted to select studies. Studies containing available genotype frequencies of Arg72Pro were chosen, and pooled odds ratio (OR) with 95% confidence interval (CI) was used to assess the association. Results: The final meta-analysis included 14 published studies with 4184 esophageal cancer cases and 7308 controls. The results suggested that the variant genotype was associated with the esophageal cancer risk in additive model (Pro vs. Arg: OR=1.146, 95% CI: 1.016-1.293, p=0.027) and in recessive model (Pro/Pro vs. Arg/Arg+Arg/Pro: OR=1.258, 95% CI: 1.021-1.551, p=0.031). In the stratified analysis by ethnicity, the data suggested that the increased esophageal cancer risk associated with p53 Arg72Pro polymorphism was more evident in the Asian group. The symmetric funnel plot, the Egger's test (p>0.05) and the Begg's test (p>0.05) suggested the lack of publication bias. Conclusion: This meta-analysis suggests that p53 codon 72 polymorphism contributes to esophageal cancer risk, especially in Asians. To validate this association, further studies with more participants worldwide are needed to examine association between this polymorphism and esophageal cancer. © Mary Ann Liebert, Inc.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Qiao Z.,University of Texas–Pan American
Journal of Mathematical Physics | Year: 2013

In this paper, we study peakon, cuspon, and pseudo-peakon solutions for two generalized Camassa-Holm equations. Based on the method of dynamical systems, the two generalized Camassa-Holm equations are shown to have the parametric representations of the solitary wave solutions such as peakon, cuspon, pseudo-peakons, and periodic cusp solutions. In particular, the pseudo-peakon solution is for the first time proposed in our paper. Moreover, when a traveling system has a singular straight line and a heteroclinic loop, under some parameter conditions, there must be peaked solitary wave solutions appearing. © 2013 AIP Publishing LLC.


Li J.,Shanghai University | Tang L.,Shanghai University | Li S.,Kunming University of Science and Technology | Wu X.,Shanghai University
Materials and Design | Year: 2013

Considering the phase transformation and its latent heat effect, a multi-physical field coupling numerical model is built to reproduce the deep cryogenic treatment (DCT) of a newly developed cold work die steel Cr8Mo2SiV (SDC99) specimen, and to predict the microstructure and hardness distribution and the dimensional change. In addition, an experimental setup is designed to validate the cooling behavior of DCT. The results indicate that, during DCT, the differences in temperature and cooling rate between the surface and core of specimen is very significant. However, the acute temperature and cooling rate changes are mainly concentrated on the specimen surface region about 1/3 of the sample thickness, while these changes are performed in a slow and gentle manner at the core region of specimen. After DCT, the unstable retained austenite contained in quenched specimen will significantly decrease, but this phase transformation is still incomplete. Accompanied with this phase transformation, the dimensional change of specimen is inevitable. At the initial stage of DCT, the dimensional change undergoes a rapid increase. Subsequently, the dimensional change shows a very slow increase. Meanwhile, the Rockwell hardness of specimen after DCT will also increase to 65HRC. Compared with the experimental results, these predicted results present a quite good accuracy, which indicate that the multi-physical field coupling simulation is an effective method to evaluate the cooling behavior of DCT. © 2013 Elsevier Ltd.


Zhao N.,Kunming University of Science and Technology | Zhao N.,University of Macau | Lian Z.,University of Macau
International Journal of Production Economics | Year: 2011

We consider a queueing-inventory system with two classes of customers. Customers arrive at a service facility according to Poisson processes. Service times follow exponential distributions. Each service uses one item in the attached inventory supplied by an outside supplier with exponentially distributed lead time. We find a priority service rule to minimize the long-run expected waiting cost by dynamic programming method and obtain the necessary and sufficient condition for the priority queueing-inventory system being stable. Formulating the model as a level-dependent quasi-birth-and-death (QBD) process, we can compute the steady state probability distribution by BrightTaylor algorithm. Useful analytical properties for the cost function are identified and extensive computations are conducted to examine the impact of different parameters to the system performance measures. © 2010 Elsevier B.V. All rights reserved.


Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology | Chen G.,City University of Hong Kong
International Journal of Bifurcation and Chaos | Year: 2010

Using analytic methods from the dynamical systems theory, some new nonlinear wave equations are investigated, which have exact explicit parametric representations of breaking loop-solutions under some fixed parameter conditions. It is shown that these parametric representations are associated with some families of open level-curves of traveling wave systems corresponding to such nonlinear wave equations, each of which lies in an area bounded by a singular straight line and the stable and the unstable manifolds of a saddle point of such a system. © 2010 World Scientific Publishing Company.


Wen Y.-W.,Kunming University of Science and Technology | Chan R.H.,Chinese University of Hong Kong | Yip A.M.,National University of Singapore
IEEE Transactions on Image Processing | Year: 2012

Loss of information in a wavelet domain can occur during storage or transmission when the images are formatted and stored in terms of wavelet coefficients. This calls for image inpainting in wavelet domains. In this paper, a variational approach is used to formulate the reconstruction problem. We propose a simple but very efficient iterative scheme to calculate an optimal solution and prove its convergence. Numerical results are presented to show the performance of the proposed algorithm. © 2011 IEEE.


Liu Y.,Zhejiang Normal University | Li J.,Zhejiang Normal University | Li J.,Kunming University of Science and Technology
International Journal of Bifurcation and Chaos | Year: 2010

For a class of cubic nilpotent system, the formulae of the first eight quasi-Lyapunov constants are obtained. We show that the origin of this system is a center if and only if the first eight Lyapunov constants are zeros. Under a small perturbation, eight limit cycles can be created from the eight-order weakened focus. © 2010 World Scientific Publishing Company.


Liu H.,Binzhou University | Liu H.,Kunming University of Science and Technology | Li J.,Kunming University of Science and Technology | Li J.,Zhejiang Normal University | Liu L.,Shandong University
Nonlinear Dynamics | Year: 2010

In this paper, the three variable-coefficient Gardner (vc-Gardner) equations are considered. By using the Painlevé analysis and Lie group analysis method, the Painlevé properties and symmetries for the equations are obtained. Then the exact solutions generated from the symmetries and Painlevé analysis are presented. © 2009 Springer Science+Business Media B.V.


Li C.-X.,Kunming University of Science and Technology | Li C.-X.,Chinese Academy of Geological Sciences | Duan Y.-H.,Kunming University of Science and Technology | Hu W.-C.,Nanchang University
Journal of Alloys and Compounds | Year: 2015

The density-functional theory with the generalized gradient approximation was performed to investigate the structural properties, phase stability, electronic structure, elastic properties, and optical properties of selected Ca5(PO3)4F (FA), Ca5(PO3)4Cl (ClA) and Ca5(PO3)4Br (BrA). Results of formation enthalpies show that FA is regarded as the most stable one in these apatites. The electronic structures including band structure, density of states and Mulliken analysis have been discussed. The predicted elastic moduli results indicate that the degree of elastic anisotropy is ordered as follows BrA > ClA > FA. By using the Clarke's model and Cahill's model, the thermal conductivities and the anisotropy in thermal conductivity have also been analyzed. Optic properties results indicate that the refractive indexes n for FA, ClA and BrA are 1.17, 1.19 and 1.21, respectively. © 2014 Elsevier B.V. All rights reserved.


Li B.,Kunming University of Science and Technology | Wang Y.,Kunming University of Science and Technology
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

The piezoresistivity and temperature effect of the conductive rubber are analyzed. The sample of conductive rubber is prepared by experiments, and research on the piezoresistivity and temperature effect of the sample with different conductive particle. The experiments illustrate that the conductive rubber shows different temperature characteristics when different conductive material was added. With temperature rising, conductive rubber alone filled acetylene black, it shows the negative temperature effect between 30 to 70°C and the positive temperature effect between 70 to 120°C; conductive rubber filled acetylene black and N472 show positive temperature effect with temperature rising; conductive rubber filled nano-Al2O3 show negative temperature effect and the positive temperature. The correlation of resistivity and temperature in change the pressure are discussed, and the main reasons of showing different temperature characteristic are analyzed.


Chen L.,Kunming University of Science and Technology | Ding L.,Kunming University of Science and Technology | Huang J.,Kunming University of Science and Technology
Minerals Engineering | Year: 2014

Rod matrix is effectively applied in pulsating high gradient magnetic separation (PHGMS), due to its reliable operation, simple combination and resistance to mechanical entrainment. The matrix is made of huge numbers of rod elements and as a whole its configuration presents a decisive role in the operation of PHGMS, due to the fact that it has an inherent determination on the distribution of magnetic field in the matrix and on the collision efficiency of particles with the matrix, thus producing a dominant control on the dynamics of magnetic particles in the matrix and on the separation performance of PHGMS. An experimental approach entitled Slice Matrix Analysis (SMA) method is developed and attempted to optimize the configuration of rod matrix, with a cyclic pilot-scale PHGMS separator in concentrating fine hematite. It was found that the configuration has a significant effect on the separation performance of PHGMS, and the SMA method provides an effective way for the optimization of rod matrix. © 2014 Elsevier Ltd. All rights reserved.


He Y.,Kunming University of Science and Technology | Xu Z.,Kunming University of Science and Technology | Zhang Y.,China Institute of Technology | Wang Z.,China Institute of Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

In order to realize visual analysis and prediction of slope stability, a worksite slope in Shuangbai, Chuxiong is investigated. Based on digital elevation model(DEM), combining the factors such as rainfall, topography and geomorphology, and soil characteristics, the threshold rainfall for deformation and instability of the slope unit is calculated by the rainfall threshold model. And the effects of rainfall infiltration and gradient on slope stability are analyzed. Comparing the results between the model prediction and the actual monitoring of slope stability, it is shown that the rainfall threshold model can simulate well the needful rainfall which can induce the instability of slope in each unit. The unit of slope may be instable when the rainfall is larger than the rainfall threshold of slope. The simulation result fits the real slope instability cases very well.


Li P.L.,Kunming University of Science and Technology | Shi Y.F.,Yunnan copper co. | Liu D.W.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

With the development and exhaustion of resources, the reclamation of secondary resources, especially urban mine, must be on the agenda. The major part of urban mine is waste printed circuit board (WPCB), and the effective processing of WPCB is depend on the disassembly. This article analyze the form of fastening, the method of fusion welding, the recovery of welding and the disassembly of electronic component in process of disassembly, and point out the direction and tendency of development. © (2014) Trans Tech Publications, Switzerland.


Na J.,Kunming University of Science and Technology | Costa-Castello R.,Polytechnic University of Catalonia | Grino R.,Polytechnic University of Catalonia | Ren X.,Beijing Institute of Technology
Asian Journal of Control | Year: 2012

A novel discrete-time repetitive controller design for time-delay systems subject to a periodic reference and exogenous periodic disturbances is presented. The main idea behind the proposed approach is to take advantage of the plant delay in the controller design, and not to compensate for the effect of this delay. To facilitate this concept, we introduce an appropriate time-delay and a compensator in a positive feedback connection with the plant, such that a generator for periodic signals is constructed. Then a proportional controller is used to stabilize the closed-loop system. The tracking control capability is thus guaranteed according to the internal model principle (IMP). In addition, to attenuate external periodic disturbances, a disturbance observer (DO) is developed to simultaneously achieve reference tracking and disturbance rejection. The possible fractional delay due to the digital discretization is handled by using a fractional delay filter approximation. The proposed controller has a simple structure, in which only a proportional parameter and a low-pass filter are required to be chosen. The closed-loop stability conditions and a robustness analysis under model uncertainties are studied. Numerical simulations and practical experiments on a servo motor system are conducted to verify the feasibility and simplicity of the proposed controller. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.


Li C.,Shanghai JiaoTong University | Li C.,Kunming University of Science and Technology | Yuan J.,Shanghai JiaoTong University | Han B.,Shanghai JiaoTong University | Shangguan W.,Shanghai JiaoTong University
International Journal of Hydrogen Energy | Year: 2011

Novel CdS nanomaterials were synthesized by a simple "one-pot" hydrothermal biomolecule-assisted method using glutathione (GSH) as the sulfur source and structure-directing reagent. Various morphologies of CdS photocatalysts, such as solid nanospheres (s-CdS), hollow nanospheres (h-CdS) and nanorods (r-CdS), were obtained by controlling only the hydrothermal temperatures. The X-ray diffraction patterns confirmed that all of the samples were typical hexagonal wurtzite CdS. It was found that the absorption edge of s-CdS was at 465 nm with a greater blue shift compared to that of h-CdS and r-CdS. The photocatalytic activity of s-CdS was superior to that of h-CdS and r-CdS under visible light. Photoluminescence measurements revealed their different photogenerated electron/hole recombination ability, which was in accordance with the order of s-CdS < h-CdS < r-CdS. The excellent photocatalytic activity of s-CdS was ascribed to the small sizes of sub-nanocrystallites, which make it easy for photoinduced electrons and holes on the solid sphere to migrate to the surface and react with water and the sacrificial agent quickly. It was crucial to control the temperature for preparing CdS photocatalysts via hydrothermal methods. The formation mechanism of different morphology might be due to complexation, S-C bond rupture, spherical aggregation and Ostwald ripening processes. © 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Zhang Y.,CAS Institute of Mechanics | Liu Y.,Kunming University of Science and Technology | Murphy K.D.,University of Connecticut
Acta Mechanica Sinica/Lixue Xuebao | Year: 2012

Nonlinear dynamic response of nanomechanical resonator is of very important characteristics in its application. Two categories of the tension-dominant and curvature-dominant nonlinearities are analyzed. The dynamic nonlinearity of four beam structures of nanomechanical resonator is quantitatively studied via a dimensional analysis approach. The dimensional analysis shows that for the nanomechanical resonator of tension-dominant nonlinearity, its dynamic nonlinearity decreases monotonically with increasing axial loading and increases monotonically with the increasing aspect ratio of length to thickness; the dynamic nonlinearity can only result in the hardening effects. However, for the nanomechanical resonator of the curvature-dominant nonlinearity, its dynamic nonlinearity is only dependent on axial loading. Compared with the tension-dominant nonlinearity, the curvature-dominant nonlinearity increases monotonically with increasing axial loading; its dynamic nonlinearity can result in both hardening and softening effects. The analysis on the dynamic nonlinearity can be very helpful to the tuning application of the nanomechanical resonator. © 2011 The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.


Zhao Y.,Anyang University, China | Bi G.,Kunming University of Science and Technology
International Review on Computers and Software | Year: 2012

The aim of this paper is to present a new modeling method for complex steel rolling logistics system. Because of interior relation complexity and flexibility demanded in production of rolling logistics system, the rolling system was defined as a multi-agent systems, agent behavior was decomposed into action and status and that is devoted to utilizing Petri nets for modeling and describing of dynamic process. Then, the model of complex rolling multi- agent system is developed and modeling process is discussed on detail, especially, four type agent, namely, transport agent, heating furnace agent, rolling agent and buffer agent was generalized. Moreover, communication process of agents was designed and behavior reasoning was analyzed in rolling system. At last, a case study of rolling logistics system is provided to show the applicability of our approach and the simulation results show that the modeling method is correct and effective. © 2012 Praise Worthy Prize S.r.l.


Huang X.-L.,CAS Guangzhou Institute of Geochemistry | Niu Y.,Lanzhou University | Niu Y.,Durham University | Xu Y.-G.,CAS Guangzhou Institute of Geochemistry | And 4 more authors.
Contributions to Mineralogy and Petrology | Year: 2013

The 40Ar-39Ar dating reveals three episodes of basaltic volcanism in eastern Guangdong of SE China since the late Eocene (i. e., 35.5, ~20 and 6.6 Ma). The Miocene alkali olivine basalts (~20 and 6.6 Ma) have OIB-like trace element characteristics, which is coupled with low (87Sr/86Sr)i, high εNd(t), and high εHf(t). In contrast, the late Eocene basalts (35. 5 Ma) have overall characteristics of "Island Arc" basalts with strong negative Ta-Nb-Ti anomalies in the primitive mantle-normalized multi-element diagram with high (87Sr/86Sr)i, negative εNd(t), and relatively low εHf(t). All basalts have unexpectedly high 207Pb/204Pb and 208Pb/204Pb, delineating a DUPAL signature in the sources. The late Eocene Arc-like basalts may reflect contributions of relict ancient metasomatized mantle lithosphere that melted as the result of extension-induced asthenospheric upwelling and heating, whereas the Miocene OIB-like basalts may represent partial melting of the asthenospheric mantle beneath the thickened lithosphere. We propose that the Cenozoic basaltic volcanism in eastern Guangdong records an overall lithospheric thickening process beneath SE China, that is, a continental rift system from its maximum extension in the late Eocene to its waning in the Miocene. This interpretation is consistent with the evolution of the South China Sea, whose origin is most consistent with the development of a passive continental margin. The seafloor spreading of the South China Sea during ~ 32-16 Ma may not result from the effect of the "Hainan" mantle plume, but rather played a positive role in allowing the mantle plume to express on the surface. © 2012 Springer-Verlag Berlin Heidelberg.


Tai Z.,Yunnan University | Cai L.,Yunnan University | Dai L.,Kunming University of Science and Technology | Dong L.,Yunnan University | And 4 more authors.
Food Chemistry | Year: 2011

The antioxidant activities of crude extract and its derived soluble fractions from the flower of Sophora viciifolia were evaluated in five different test systems (DPPH, ABTS, FRAP, reducing power and inhibition of lipid peroxidant models) for the first time. The ethylacetate soluble fraction exhibited the highest antioxidant effect. Correlation analysis suggested that the flavonoids might be the major contributors for the high antioxidant activity of this flower. In addition, 11 compounds were isolated from this flower, and the antioxidant capacities of 5 flavonoids were evaluated by DPPH assay. Compound 3 (luteolin) had a significant DPPH radical-scavenging activity, and was also present at the highest concentration (5.56 mg/g dry sample), implying an important role of 3 for the antioxidant activity of this flower. The study suggests that the flower of S. viciifolia can provide valuable functional ingredients and can be used for the prevention of diseases related to various oxidant by-products of human metabolism. © 2010 Elsevier Ltd. All rights reserved.


Luo H.,Kunming University of Science and Technology | Wang R.,Shanghai JiaoTong University | Dai Y.,Shanghai JiaoTong University
Applied Energy | Year: 2010

A solar-powered adsorption chiller with heat and mass recovery cycle was designed and constructed. It consists of a solar water heating unit, a silica gel-water adsorption chiller, a cooling tower and a fan coil unit. The adsorption chiller includes two identical adsorption units and a second stage evaporator with methanol working fluid. The effects of operation parameter on system performance were tested successfully. Test results indicated that the COP (coefficient of performance) and cooling power of the solar-powered adsorption chiller could be improved greatly by optimizing the key operation parameters, such as solar hot water temperature, heating/cooling time, mass recovery time, and chilled water temperature. Under the climatic conditions of daily solar radiation being about 16-21 MJ/m2, this solar-powered adsorption chiller can produce a cooling capacity about 66-90 W per m2 collector area, its daily solar cooling COP is about 0.1-0.13. © 2010 Elsevier Ltd. All rights reserved.


Na J.,Kunming University of Science and Technology | Ren X.,Beijing Institute of Technology | Costa-Castello R.,Polytechnic University of Catalonia | Guo Y.,Kunming University of Science and Technology
Robotics and Autonomous Systems | Year: 2014

In many industrial robotic servo applications there is a need to track periodic reference signals and/or reject periodic disturbances. Moreover, time-delays are usually unavoidable in control systems due to the sensoring and communication delays. This paper presents an alternative repetitive control design for systems with constant time-delays in both forward and feedback control channels, which are dedicated to track/reject periodic signals. An additional delay is introduced together with the plant delays to construct an internal model for periodic signals, and a simple compensator based on the plant model inverse is utilized to stabilize the closed-loop system. Sufficient stability conditions of the closed-loop system and the robustness analysis against modeling uncertainties are studied. The proposed idea is further extended for general time-delay systems with only a delay term in the forward control channel. The "plug-in" structure used in conventional repetitive control designs is avoided, so that it leads to a simpler control configuration, i.e. only a proportional parameter and the cutoff frequency of a low-pass filter are required to be selected. Simulations based on a hard disk drive system and practical experiments on a rotary robotic servo system are provided to evaluate the effectiveness of the proposed method. © 2013 Elsevier B.V. All rights reserved.


Aryal R.,University of Illinois at Urbana - Champaign | Jagadeeswaran G.,Oklahoma State University | Zheng Y.,Kunming University of Science and Technology | Yu Q.,Texas AgriLife Research Center | And 4 more authors.
BMC Genomics | Year: 2014

Background: Regulatory function of small non-coding RNAs (sRNA) in response to environmental and developmental cues has been established. Additionally, sRNA, also plays an important role in maintaining the heterochromatin and centromere structures of the chromosome. Papaya, a trioecious species with recently evolved sex chromosomes, has emerged as an excellent model system to study sex determination and sex chromosome evolution in plants. However, role of small RNA in papaya sex determination is yet to be explored.Results: We analyzed the high throughput sRNAs reads in the Illumina libraries prepared from male, female, and hermaphrodite flowers of papaya. Using the sRNA reads, we identified 29 miRNAs that were not previously reported from papaya. Including this and two previous studies, a total of 90 miRNAs has been identified in papaya. We analyzed the expression of these miRNAs in each sex types. A total of 65 miRNAs, including 31 conserved and 34 novel mirNA, were detected in at least one library. Fourteen of the 65 miRNAs were differentially expressed among different sex types. Most of the miRNA expressed higher in male flowers were related to the auxin signaling pathways, whereas the miRNAs expressed higher in female flowers were the potential regulators of the apical meristem identity genes. Aligning the sRNA reads identified the sRNA hotspots adjacent to the gaps of the X and Y chromosomes. The X and Y chromosomes sRNA hotspots has a 7.8 and 4.4 folds higher expression of sRNA, respectively, relative to the chromosome wide average. Approximately 75% of the reads aligned to the X chromosome hotspot was identical to that of the Y chromosome hotspot.Conclusion: By analyzing the large-scale sRNA sequences from three sex types, we identified the sRNA hotspots flanking the gaps of papaya X, Y, and Yh chromosome. The sRNAs expression patterns in these regions were reminiscent of the pericentromeric region indicating that the only remaining gap in each of these chromosomes is likely the centromere. We also identified 14 differentially expressed miRNAs in male, female and hermaphrodite flowers of papaya. Our results provide valuable information toward understanding the papaya sex determination. © 2014 Aryal et al.; licensee BioMed Central Ltd.


Li C.,Shanghai JiaoTong University | Li C.,Kunming University of Science and Technology | Yuan J.,Shanghai JiaoTong University | Han B.,Shanghai JiaoTong University | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2010

The CdS/TiO2 composites were synthesized using titanate nanotubes (TiO2NTs) with different pore diameters as the precursor by simple ion change and followed by sulfurization process at a moderate temperature. Some of results obtained from XRD, TEM, BET, UV-vis and PL analysis confirmed that cadmium sulfide nanoparticles (CdSNPs) incorporated into the titanium dioxide nanotubes. The photocatalytic production of H2 was remarkably enhanced when CdS nanoparticles was incorporated into TiO 2NTs. The apparent quantum yield for hydrogen production reached about 43.4% under visible light around λ = 420 nm. The high activity might be attributed to the following reasons: (1) the quantum size effect and homogeneous distribution of CdSNPs; (2) the synergetic effects between CdS particles and TiO2NTs, viz., the potential gradient at the interface between CdSNPs and TiO2NTs. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.


Dai J.-Q.,Kunming University of Science and Technology | Fang Z.,CAS Institute of Physics
Journal of Applied Physics | Year: 2012

First principles calculations were used to investigate the lattice dynamics, electronic property, and spontaneous polarization of Bi 2ZnTiO 6 10-atom supercell. We explore the ground structure from the highest P4/mmm phase by successively freezing in the unstable polar modes. We find that the ground structure is in the Cm symmetry instead of the P4mm symmetry, and the spontaneous polarization is not as large as that of previous belief. Finally, we suggest possible routes by which the energy of metastable P4mm phase may be close to the Cm ground phase to enable a practical realization for polarization rotation. © 2012 American Institute of Physics.


Yu P.F.,Yunnan University | Yu P.C.,Kunming University of Science and Technology | Yu P.C.,Yunnan University
Applied Mechanics and Materials | Year: 2014

With the rapid development of biometric technology, the security issues have drawn people's greater attention because some biometric features are Easy to forge and are not replaceable. As a result, the security issue of biometric system extremely critical to be solved. In this paper, we introduce a public watermarking algorithm which is based on Discrete Cosine Transformation (DCT). By using the proposed algorithm, the finger geometry is embedded into the region of interest (ROI) of palmprint image. This method has the ability to increase the security of both the palmprint image and the finger geometry. Experimental results performed on a database of 86 hands (10 impressions per hand) show that the proposed algorithm is effective, and the watermarking operation has little impact on the recognition performance. © (2014) Trans Tech Publications, Switzerland.


Kong Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The bauxite deposits in the study area belongs to the monohydrate bauxite deposit that were located the eroded surface of carbonate rocks, and the host country rock is the Middle-Permian Liangshan formation strata. In order to understand the development situation of the sedimentary facies of Liangshan formation in different periods and in different regions in the study area as well as the evolutionary process,the authors selected four strata profiles for the comparative analysis from the drilling records.The result indicated that there were two stages of transgression and a stage of marine regression in the study area during the ore-forming period,and the sea water transgressed into the NE part from the SW direction.The paleogeographic frame work played an important role in the deposition of the ore-forming materials,deposit preservation and the secondary enrichment.The study area includes Kaili,south-east of Guizhou province, and Huangping county area, the Middle Permian Liangshan formation (P2l), Qixia group and Mao El group (P2q-m) which strata is widely developed. As the ledge, Liangshan formation deposit coal, bauxite and siderite, the bauxite as the main mineral, with good prospects for exploration and development. In recent years, the study area has become another major exploration of bauxite mining area of Guizhou Province. A preliminary proven that a large deposits stores in small and medium-sized deposits. Many scholars study a lot on the bauxite deposits, bauxite sedimentary environment and so on [1-7], but there are much less on the bauxite deposits of this area, which restricts the further prospecting range and prospecting evaluation. Therefore, this paper analysis the Characteristics of bauxite sedimentary facies and the relation with bauxite mineralizing in Kaili-Huangping area through collecting systematically, gathering Geological data and Mineral materials an other new exploration results. © (2014) Trans Tech Publications, Switzerland.


Yao X.Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

In order to effectively extract signal information from underwater acoustic environment and complete ability to denoise, based on EMD's denoising and differences of respective autocorrelation functions between noise and signal, aiming at shortcomings of absence from stability in demarcation point between noise and signal that are in line with energy change curve, the paper puts forward a kind of EMD's new-type denoising method that is based on characteristics of autocorrelation functions. Moreover, it verifies effectiveness of this method through a large number of simulation experiments. © (2014) Trans Tech Publications, Switzerland.


Wang J.Y.,Kunming University of Science and Technology | Huang Y.Y.,Kunming University of Science and Technology | Chen Z.H.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Being established and assembled in UG, the model file of spur gears was imported to ANSYS workbench, where the contact between gears was built, meshing completed later. Then support and loads was imposed on the finite element model to obtain characteristics of modal and stress distribution on the teeth. After that they each were compared with working frequency and theoretically maximum contact stress and we found the fact was they fit well. By doing this, it is sound to say finite element analysis of spur gears on modal and stress is effective, feasible and reliable. © (2014) Trans Tech Publications, Switzerland.


Wan F.X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Fire-resistance performance of beams can be improved if the beam strengthened by carbon fiber sheet bonded with inorganic adhesive instead of organic epoxy adhesive with low softening temperature. However, Fire-resistance performance of the strengthened beams is not understood fully. Considering this issue, finite element analysis is done. Stating from building valid model of finite element, computing results are compared with experimental results, and rationality of the model is verified. Then plenty of parameter analysis is done. Effect of some parameters, such as Range of carrying capacity increase by sheet, reinforcement ratio, load ratio to carrying capacity and width of section, on fire-resistance performance of the strengthened beams is analysis. The results demonstrates that reinforcement ratio and load ratio to carrying capacity is the main factors influencing fire-resistance performance of the beam strengthened by carbon fiber sheet bonded with inorganic adhesive, While, range of carrying capacity increase by sheet and width of section have little influence on it. Beams, strengthened by carbon fiber sheet bonded with inorganic adhesive, and protected by Thick-typed Fireproof Coating, perform good fire behavior. © (2014) Trans Tech Publications, Switzerland.


Wan F.X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Because of high temperature above 1000°C on fire, and Oxidation of carbon fiber at high temperature, fireproofing measure should be make to take advantage of inorganic adhesive for slabs strengthened by carbon fiber sheet bonded with the adhesive. The problem of which fireproofing material should be choose and how to make fireproofing measure needs to resolve. Fireproofing test is make for slabs strengthened by carbon fiber sheet bonded with the adhesive protected by Thick-typed Fireproof Coating for steel structure (TFCSS) and Thick-typed Fireproof Coating for tunnel (TFCT). Typical damage state of the two typical coating is compared during and after fire, Temperature field of slab specimen is analyzed, and fireproofing effect is compared. The test results indicate that, steel wire mesh in the middle of coating layer can prevent coating from falling fully, so steel wire mesh is necessary for fireproofing coat which is not too thick. under the protection of fireproof coating with proper construction, TFCT and TFCSS can supply effective fireproofing protection for carbon fiber sheet, but the former is inferior to the latter because the latter is easier to drop and crack in fire. So, TFCT with steel wire mesh can supply the most effective protection for slabs strengthened by carbon fiber sheet bonded with the adhesive. © (2014) Trans Tech Publications, Switzerland.


Li L.P.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

In this paper, the test of the indoor thermal environment for the traditional Dai nationality dwellings of Jinghong in Xishuaibanna in summer, that have tested indoor temperature and the temperature of house surface, and contrast to analysis tested parameters. The results of the test show climate characteristics in Xishuaibanna and variations of temperature effecting indoor thermal comfortable. The proposes and measures be taken out from this test for improving the comfortable of the indoor thermal environment. © (2014) Trans Tech Publications, Switzerland.


Zhang W.,Kunming University of Science and Technology
International Journal of Simulation: Systems, Science and Technology | Year: 2016

The issue of library user demand has been a focus content in the field of library and information. Scholars have been aware of the importance of this problem. Libraries have been focused on the construction, technology development and application of system on user demand, but the study of user requirement has not been rarely implemented. This paper establishes the ecological services system of library user demand, studies the components and function of the system based on the perspective of ecology. Finally, this paper carries out empirical research on the ecological services system of library user demand on the basis of model assumption and verified through the system’s feasibility. © 2016, UK Simulation Society. All rights reserved.


Pan N.,Kunming University of Science and Technology
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

Detection for vehicle braking performance is an important part of vehicle safety and technical inspection, brake performance will be directly related to road safety and transport efficiency. Currently, brake test systems are often cured manner provided by the equipment suppliers, these systems have weak points such as designing complex, inflexible, environmentally sensitive and can't be professional analysis. Developed a highly reliable portable vehicle test system by integrating multiple types of sensors and custom auxiliary functions based on NI-CRIO hardware platform and LabVIEW development tools. The system analysis and processing the acquired signals, then determine the actual work of automotive brake systems quickly and accurately. Road test shows the effectiveness and reliability of the system.


Zhang Q.,Kunming University of Science and Technology | Hua Y.,Kunming University of Science and Technology
Journal of Applied Electrochemistry | Year: 2011

The effects of ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO4 on the current efficiency (CE), surface morphology, and crystallographic orientations during zinc electrodeposition from acidic sulfate solutions containing some common impurities such as copper, iron, cobalt, nickel, and lead were investigated. The results indicated that all the metallic impurities studied exerted a deleterious effect on the zinc electrodeposition process by decreasing the CE, influencing the purity, and inducing changes in morphology of the cathodic deposits. The addition of [BMIM]HSO4 was observed to relieve the harmful effects of these impurities to some extent, and led to reduce the impurity content in the zinc deposits and improve the CE and the quality of the cathodic deposits. The data obtained from X-ray diffraction revealed that the presence of these impurities alone and in combination with [BMIM]HSO4 did not change the structure of the electrodeposited zinc but affected the crystallographic orientation of the crystal planes. © 2011 Springer Science+Business Media B.V.


Li L.,Kunming University of Science and Technology | Yang Y.,Kunming University of Science and Technology | Zhou D.,Kunming University of Science and Technology | Xu X.,Kunming University of Science and Technology | Qiu J.,Kunming University of Science and Technology
Journal of Non-Crystalline Solids | Year: 2014

Different ionic silver species and Ag nanoparticles (Ag NPs) were prepared by Ag+-Na+ ion exchange method in Tb3 +-doped sodium-aluminosilicate glasses, and the interaction between Ag species and Tb3 + ions was studied. Two excitation peaks centered at 280 nm and 375 nm which ascribed to Ag+ and Ag aggregates (Ag2 +, Ag3 +.) respectively were observed in as-made glasses. Owing to energy transfer (ET) from Ag+/silver aggregates to Tb3 +, significant enhancements of Tb3 + emission were observed under certain excitation. After heat treatment, the results of absorption spectrum and TEM patterns revealed that silver nanoparticles (Ag NPs) with diameter of about 5 nm were formed in glasses, and it was found that the Ag NPs led to a significant enhancement in Tb3 + luminescence under 375 nm excitation. A possible mechanism of energy transfer from Ag species to Tb3 + ions was proposed. © 2013 Elsevier B.V. All rights reserved.


Ning P.,Kunming University of Science and Technology | Wang X.,Kunming University of Science and Technology | Bart H.-J.,University of Kaiserslautern | Tian S.,Kunming University of Science and Technology | And 2 more authors.
Journal of Cleaner Production | Year: 2011

In order to provide comprehensive utilization of high concentration CO for mono-carbon (C1) chemical industry, the purification of yellow phosphorus off-gas is of great concern. In this research, activated carbon (AC) modified by different impregnants were used for removal of PH3, H2S, SO2, COS, and CS2 in yellow phosphorus off-gas. For the removal of PH3, AC impregnated with 0.10 mol L-1 CuAc 2 was proved to be the best adsorbent. And removal efficiency of H2S could be significantly enhanced by AC impregnated with 7% Na 2CO3. The results of plant experiments suggested that the total concentration of the impurities in yellow phosphorus off-gas was less than 1 mg Nm-3 after purification operation. The metal-modified activated carbon (MMAC) was systematically characterized in terms of XPS, TGA, and DTA. The adsorption reaction mechanism was also investigated. As a result, the yellow phosphorus off-gas purified in this study can be used as a raw material gas in the C1 chemical industry. © 2011 Elsevier Ltd. All rights reserved.


Cai H.Q.,Kunming University of Science and Technology
Yi chuan = Hereditas / Zhongguo yi chuan xue hui bian ji | Year: 2010

Whole genome amplification (WGA) is a technique that could non-selectively amplify the genomic DNA. In recent years, intensive studies have been made on application of WGA in trace DNA amplification, which might be applied to amplify trace DNA collected from crime scenes and provide enough DNA templates for forensic individual identification. However, the problem of amplification bias happened in the complicated test materials from real crime scenes is still troublesome. Development of WGA method with low amplification bias and high yield is the main target of current forensic research. Here, we reviewed the advances and the application prospect of WGA in individual identification. This might provide a reference for solving the problem of the amplification bias.


Fang H.,Kunming University of Science and Technology
Electronic Journal of Differential Equations | Year: 2012

By using Mawhin's coincidence degree theory, this paper establishes some sufficient conditions on the existence of four positive periodic solutions for a food-limited two-species ratio-dependent predator-prey patch system with delay and harvesting. Some novel techniques are employed to obtain the appropriate a priori estimates. An example is given to illustrate our results. © 2012 Texas State University - San Marcos.


Zhao H.,Kunming University of Science and Technology | Zhao H.,Zhoukou Normal University | Lin Y.,Kunming University of Science and Technology | Dai Y.,Kunming University of Science and Technology
Applied Mathematics and Computation | Year: 2011

In this paper, a hybrid ratio-dependent three species food chain model with time delay is studied by using the theory of functional differential equation and Hopf bifurcation, the condition on which positive equilibrium exists and the quality of Hopf bifurcation are given. Chaotic solutions are observed and are controlled by delay parameter. Finally, we indicate that when the delay passes through certain critical values, chaotic oscillation is converted into a stable state or a stable periodic orbit. © 2011 Elsevier Inc. All rights reserved.


Zhao K.,Kunming University of Science and Technology | Li Y.,Yunnan University
Electronic Journal of Differential Equations | Year: 2011

Using Mawhin's continuation theorem of coincidence degree theory, we establish the existence of 2n+m positive periodic solutions for a nonautonomous Lotka-Volterra network-like predator-prey system with harvesting terms. Here n and m denote the number of prey and predator species respectively. An example is given to illustrate our results. 1. Introduction and description of the model In the usual predator-prey model, there is only one predator and one prey. However, in nature we encounter complex systems with several species as predators and several species as prey. In our model all predators form one layer, and all prey form another layer; to be called predator layer and prey layer, respectively. There is a competition relationship among each species lying in the same layer because they fight for food, living space and so on. Considering the above, in this paper, we introduce the following non-autonomous Lotka-Volterra network-like predator-prey system with harvesting terms. © 2011 Texas State University.


Li Y.,Kunming University | Zhao K.,Kunming University of Science and Technology
Mathematical Modelling and Analysis | Year: 2010

By using the Mawhin continuation theorem of coincidence degree theory and some results on inequalities, we establish the existence of 2n positive periodic solutions for n species non-autonomous Lotka-Volterra unidirectional food chains with harvesting terms. Two examples are given to illustrate the effectiveness of our results. © Vilnius Gediminas Technical University, 2010.


Fang H.,Kunming University of Science and Technology
Journal of Inequalities and Applications | Year: 2012

By using Mawhin's coincidence degree theory and some inequality techniques, this paper establishes a new sufficient condition on the existence of at least eight positive periodic solutions for a food-limited two-species Gilpin-Ayala competition patch system with periodic harvesting terms. An example is given to illustrate the effectiveness of the result. © 2012 Fang; licensee Springer.


Zhou X.,Kunming University of Science and Technology | Han K.,CNRS French National High Magnetic Field Laboratory | Ren Z.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Li Z.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

Effects of high magnetic fields (HMF) up to 19.81T on pearlite phase transformation are studied by examination of the microstructures of a Fe-0.47C-2.3Si-3.2Mn (wt %) alloy partially isothermally processed above the eutectoid temperature. The results show that granular pearlite (GP) can be obtained at earlier transformation stages. The evolution of the granular pearlite is always accompanied by the formation of lamellar pearlite. TEM analysis reveals the existence of sub-grain boundaries within GP colonies and indicates that the nucleation of ferrite matrix in GP belongs to multiple nucleation mechanism. Most of carbides at the early stage of pearlite formation are found to precipitate at the α/γ interface--the growing front of ferrite phases, and some of coarse carbides can further develop into thin lamellar cementite. © (2013) Trans Tech Publications, Switzerland.


Chen G.,Tianjin University | Chen G.,Kunming University of Science and Technology | Shen Y.,Kunming University of Science and Technology | Zhang Q.,Tianjin University | And 3 more authors.
Energy | Year: 2013

In the paper, combustion and emissions of a multi-cylinder CI (compression-ignition) engine fueled with DMF-diesel, n-butanol-diesel and gasoline-diesel blends were experimentally investigated, and fuel characteristics of DMF, n-butanol and gasoline were compared. Diesel was used as the base fuel. And 30% of DMF, n-butanol and gasoline were blended with the base fuel by volume respectively, referred to as D30, B30 and G30. Results show that compared to B30 and G30, D30 has longer ignition delay because of lower cetane number, which leads to faster burning rate and higher pressure rise rate. With increasing EGR (exhaust gas recirculation) rate, D30 gets the lowest soot emissions, and extended ignition delay and fuel oxygen are two key factors reducing soot emissions, and ignition delay has greater effects than fuel oxygen on soot reduction. In addition, D30 and B30 improve the trade-off of NOx-soot remarkably and extend low-emission region without deteriorating fuel efficiency by utilizing medium EGR rates (<40%). As diesel additive, DMF is superior to n-butanol and gasoline for reducing soot emissions due to its prolonged ignition delay and atomic oxygen. Using DMF-diesel blends combined with medium EGR may be a better choice for diesel engine to meet future emissions regulations with high fuel efficiency. © 2013 Elsevier Ltd.


Liu M.,Kunming University of Science and Technology | Guo P.,Kunming University of Science and Technology
MATEC Web of Conferences | Year: 2016

From the perspective of customer service and on the basis of network, this paper proposes a computer hardware monitoring system based on cloud platform, which separates the data acquisition, storage, and analysis based on cloud computing hardware monitoring system. The computer hardware monitoring system based on cloud platform separates data storage and access. The cloud platform unifies modeling analysis of storage hardware parameters for huge amounts of data, in order to provide users with complete hardware maintenance information. This paper introduces the overall design of the hardware monitoring system, and then gives the system structure and related key technologies of implementation instance. © Owned by the authors, published by EDP Sciences, 2016.


Yang K.,Kunming University of Science and Technology | Peng J.,Kunming University of Science and Technology | Srinivasakannan C.,University of Selangor | Zhang L.,Kunming University of Science and Technology | And 2 more authors.
Bioresource Technology | Year: 2010

The present study attempts to utilize coconut shell to prepare activated carbon using agents such as steam, CO2 and a mixture of steam-CO2 with microwave heating. Experimental results show that the BET surface area of activated carbons irrespective of the activation agent resulted in surface area in excess of 2000m2/g. The activation time using microwave heating is very much shorter, while the yield of the activated carbon compares well with the conventional heating methods. The activated carbon prepared using CO2 activation has the largest BET surface area, however the activation time is approximately 2.5 times higher than the activation using steam or mixture of steam-CO2. The chemical structure of activated carbons examined using Fourier transformed infra-red spectra (FTIR) did not show any variation in the surface functional groups of the activated carbon prepared using different activation agents. © 2010 Elsevier Ltd. All rights reserved.


Wang X.,Harbin Institute of Technology | Wang X.,Kunming University of Science and Technology | Ning P.,Kunming University of Science and Technology | Liu H.,Harbin Institute of Technology | Ma J.,Harbin Institute of Technology
Applied Catalysis B: Environmental | Year: 2010

Two kinds of dry Pd/Fe nanoparticles (Pd/Fe-1 and Pd/Fe-2) were obtained by drying the laboratory synthesized wet Pd/Fe nanoparticles with direct oven drying method and solvent replacement oven drying method, respectively. A comparison was made between the two drying methods, concerning the effects of the washing reagents used during the drying process on the physicochemical properties and the activities of Pd/Fe nanoparticles for catalytic dechlorination of chloroacetic acids. Pd/Fe nanoparticles prepared by impregnation of iron nanoparticles with an aqueous solution of potassium hexachloropalladate were washed with different reagents (deionized water and organic solvents), followed by vacuum drying in an oven at 100 °C. The prepared dry Pd/Fe-1 and Pd/Fe-2 nanoparticles were characterized in terms of specific surface area (BET-N2), morphology (SEM), surface elemental distribution (EDS), and particle size (TEM). The catalytic activities of Pd/Fe-1 and Pd/Fe-2 nanoparticles were evaluated via dechlorination reaction of chloroacetic acids including trichloroacetic acid (TCAA), dichloroacetic acid (DCAA), and monochloroacetic acid (MCAA). The removal efficiencies of chloroacetic acids by Pd/Fe-2 were about 58.5-22.7% greater than that achieved by Pd/Fe-1. The optimal Pd content, the amount of metal loading, and the initial pH value of reaction system for higher removal efficiency of chloroacetic acids were determined. The variation of pH value, dechlorination pathway and kinetics of chloroacetic acids were also investigated. The removal efficiencies of chloroacetic acids followed the order of TCAA > DCAA > MCAA with observed reaction rate constant (kobs) values of 1.113 × 10-1, 1.278 × 10-2, and 1.900 × 10-3 min-1, respectively. © 2009 Elsevier B.V. All rights reserved.


Li K.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Wei Y.,Kunming University of Science and Technology | Yan D.,Kunming University of Science and Technology
Applied Catalysis B: Environmental | Year: 2010

CeO2, Fe2O3, Fe2O3/Al2O3 and Ce-Fe mixed oxides with different Ce/Fe ratios were prepared and characterized using XRD, Raman, XPS, and H2-TPR techniques. The selective oxidation of methane to syngas using a gas-solid reaction was investigated at 850 °C. For binary Ce-Fe oxides, only small amounts of iron ions could be incorporated into the CeO2 lattice with the superfluous Fe2O3 remaining on the surface of the molecule. Chemical interactions between surface iron sites and the Ce-Fe solid solution strongly enhanced the reducibility of materials. Methane was found to adsorb and activate on the surface iron sites as carbonaceous species and hydrogen. Carbon deposition was selectively oxidized to CO by the release of activated oxygen from the CeO2 lattice. The activation rate of methane was dependent on the quality of dispersion of surface Fe species, while the oxygen mobility of the material dominated the CO formation rate. Hydrothermally prepared Ce0.7Fe0.3O2-δ showed high activity and selectivity during the successive production of syngas using repetitive redox processes (methane reduction/air re-oxidation). Both the dispersion of surface Fe2O3 and the formation of the Ce-Fe solid solution were enhanced by the redox treatment, which made the oxygen carrier more stable. Crown Copyright © 2010.


Jiang Y.,Kunming University of Science and Technology
Proceedings - 2014 6th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2014 | Year: 2014

In order to solve the problems of 3D modeling as too much reliance on expert participation in geological identification process, this paper is to discuss on intelligent identification method of geological body, with the objectoriented knowledge representation method. The results have important reference value to improve the degree of automation and the effect of 3D modeling software, and have the important practical significance for reasonable development and utilization of mine. © 2014 IEEE.


Pan B.,Kunming University of Science and Technology | Pan B.,University of Massachusetts Amherst | Xing B.,University of Massachusetts Amherst
Journal of Agricultural and Food Chemistry | Year: 2010

Competitive adsorption between organic chemicals is an important process affecting their environmental behavior and risk. Overlapping of adsorption sites between solutes was often emphasized in the literature. However, chemicals with different properties may complementarily occupy different sorption sites. The objective of this study was to test this hypothesis by collecting detailed information on competitive and accumulative adsorption of different chemicals on carbon nanomaterials (CNMs). Bisphenol A (BPA) and 17α-ethinyl estradiol (EE2) are different with regard to their hydrophobicity and molecular structures, and they were selected as model chemicals. The cumulative adsorption of both BPA and EE2 in bisolute adsorption experiments resulted in much higher total adsorption than in single-solute adsorption experiments. A new competitive-complementary adsorption concept was proposed. This information indicates that the modeling concept of competitive adsorption should be improved to better understand the fate and risk of both CNMs and organic chemicals. © 2010 American Chemical Society.


Yu R.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology | Zhou R.,Kunming University of Science and Technology
Solid State Communications | Year: 2014

Starting from theoretical calculations based on the generalized gradient approximation (GGA), we compute the lattice parameters, cohesive energy and formation enthalpy of trigonal-type M2N (M=Cr, V, Nb and Ta) compounds by first principles. The cohesive energy and formation enthalpy of these compounds show that these compounds are thermodynamically stable. The electronic structure indicates that the bonds of M2N (M=Cr, V, Nb and Ta) have the characteristic of covalent and metallic bonds, and then Ta 2N is the most stable in the projected metal nitrides in our work. The values of bulk modulus, shear modulus, Young's modulus and Poisson's ratio indicate M2N compounds are brittle and metallic character. The figures of anisotropy in Young's modulus of M2N (M=Cr, V, Nb and Ta) compounds investigate that these nitrides have the strong anisotropy character in Young's modulus at the (100) plane. © 2013 Elsevier Ltd.


Jiao Q.,Kunming University of Science and Technology | Qiu J.,Kunming University of Science and Technology | Qiu J.,Key Laboratory of Advanced Materials of Yunnan Province | Zhou D.,Kunming University of Science and Technology | Xu X.,Kunming University of Science and Technology
Materials Research Bulletin | Year: 2014

Ag+ doped sodium borate glasses with different Eu ions concentration were prepared by the melt-quenching method. The absorption at about 410 nm which was caused by the surface plasmon resonance (SPR) of Ag nanoparticles (NPs) is promoted with increasing of Eu ions concentration. Meanwhile, the luminescent spectra showed that the emission intensity of Ag + decreased while that of the Ag aggregates increased simultaneously. The results indicated that the Ag ions intend to form the high-polymeric state such as Ag aggregates and nanoparticles with increasing of europium ions. Owing to the self-reduction of Eu3+ to Eu2+ in our glass system, it revealed that Ag+ has been reduced by the neighboring Eu 2+ which leads to the formation of Ag aggregates and the precipitation of Ag NPs in the matrix. In addition, energy transfer (ET) process from Ag+/Ag aggregates to the Eu3+ was investigated for the enhancement of Eu3+ luminescence. © 2013 Published by Elsevier Ltd.


Jia Q.,Kunming University of Science and Technology | Shan S.,Kunming University of Science and Technology | Jiang L.,Kunming University of Science and Technology | Wang Y.,Kunming University of Science and Technology
Journal of Applied Polymer Science | Year: 2010

Polyaniline (PANI)/silver (Ag) nanocomposites containing PANI nanofibers decorated with well-dispersed Ag nanoparticles were obtained with interfacial polymerization. It was interesting that silver nitride affected not only the diameter and crystallinity of the PANI nanofibers but also their room-temperature conductivity. The conductivity increased with increasing Ag loading up to 10 (molar ratio of aniline to silver nitride), but the conductivity moderately decreased with further increasing Ag loading. Scanning electron microscopy and X-ray diffraction analysis results indicate that the diameter of the PANI nanofibers became smaller and smaller, and their crystallinity got better and better with increasing Ag loading. However, Fourier transform infrared analysis proved that the balance of oxidized and reduced units of PANI became big with increasing Ag loading, which may have resulted in the decreasing conductivity of PANI. © 2009 Wiley Periodicals, Inc.


Han C.,Kunming University of Science and Technology
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

Expansive soil is high plastic clay that has properties of dilatability, much fissure and over consolidation, which mainly consists of montmorillonite that is a strongly hydrophilic clay miner and illite. As Chinese territory is vast and wide, there are a lot of expansive soils, especially in the south-eastern coastal areas. And the regional feature virtually constrained the development of our traffic infrastructure construction seriously. Based on subgrade field testing, this paper carry out a deep study on soil moisture content, particle fineness and containing ash rate which are the main control parameters of Lime-treated expansive soil. Results of this study have sound theoretic and practical significance to improve our construction technology of Limetreated expansive soil. © 2011 IEEE.


Wang M.,Kunming University of Science and Technology | Li Q.,Kunming University of Science and Technology | Li Q.,First Peoples Hospital of Yunnan Province
Natural Product Research | Year: 2015

The aim of this paper is to summarise the blocking effects of parthenolide on the cytokines and pathways that cause inflammation. Analyses of the chemical structure of parthenolide have tried to identify the active domains that play key roles in its anti-inflammatory activity. This review focuses on the anti-inflammatory actions of parthenolide in both in vitro and in vivo. These data will be helpful for future investigations into the effects of parthenolide on inflammation. © 2014 Taylor & Francis.


Li J.,Kunming University of Science and Technology | Mei C.,Xi'an Jiaotong University | Wang J.,Shanxi University | Zhang X.,Xi'an Jiaotong University
Knowledge-Based Systems | Year: 2014

Rule acquisition is one of the main purposes in the analysis of formal decision contexts. In general, given a formal decision context, some of its objects may not be essential to the rule acquisition. This study investigates the issue of reducing the object set of a formal decision context without losing the decision rule information provided by the entire set of objects. Using concept lattices, we propose a theoretical framework of object compression for formal decision contexts. And under this framework, it is proved that the set of all the non-redundant decision rules obtained from the reduced database is sound and complete with respect to the initial formal decision context. Furthermore, a complete algorithm is developed to compute a reduct of a formal decision context. The analysis of some real-life databases demonstrates that the proposed object compression method can largely reduce the size of a formal decision context and it can remove much more objects than both the techniques of clarified context and row reduced context. © 2014 Elsevier B.V. All rights reserved.


Zeng Y.,Kunming University of Science and Technology | Zhang L.,Kunming University of Science and Technology | Guo Y.,University of Aberdeen | Qian J.,Kunming University of Science and Technology | Zhang C.,Kunming University of Science and Technology
Nonlinear Dynamics | Year: 2014

Traditional rotor dynamics mainly focuses on the steady- state behavior of the rotor and shafting. However, for systems such as hydro turbine generating sets (HTGS) where the control and regulation is frequently applied, the shafting safety and stabilization in transient state is then a key factor. The shafting transient state inevitably involves multiparameter domain, multifield coupling, and coupling dynamics. In this paper, the relative value form of the Lagrange function and its equations have been established by defining the base value system of the shafting. Taking the rotation angle and the angular speed of the shafting as a link, the shafting lateral vibration and generator equations are integrated into the framework of generalized Hamiltonian system. The generalized Hamiltonian control model is thus established. To make the model more general, additional forces of the shafting are taken as the input excitation in proposed model. The control system of the HTGS can be easily connected with the shafting model to form the whole simulation system of the HTGS. It is expected that this study will build a foundation for the coupling dynamics theory using the generalized Hamiltonian theory to investigate coupling dynamic mechanism among the shafting vibration, transient of hydro turbine generating sets, and additional forces of the shafting. © 2014 Springer Science+Business Media Dordrecht.


Zhang X.S.,South China University of Technology | Li Q.,South China University of Technology | Yu T.,South China University of Technology | Yang B.,Kunming University of Science and Technology
IEEE Transactions on Smart Grid | Year: 2016

This paper develops a consensus transfer Q-learning (CTQ) for decentralized generation command dispatch (GCD) of automatic generation control (AGC). A two-layer decentralized GCD based on virtual generation tribe (VGT) is adopted to resolve the curse of dimension emerged in large-scale power systems. The leader of VGTs can calculate the generation command of each VGT through exchanging the Q-value matrices with its adjacent VGTs. In addition, a behavior transfer is employed into CTQ to exploit the prior knowledge of source tasks for a new optimization task according to their similarities, such that the algorithm convergence rate can be accelerated and the requirement of AGC period is satisfied. Case studies are carried out to evaluate the performance of CTQ for decentralized GCD on China southern power grid model. © 2016 IEEE.


Luo Z.-Q.,Kunming University of Science and Technology | Chen Z.-M.,University of Southampton
Applied Mathematics and Mechanics (English Edition) | Year: 2013

A three-dimensional (3D) predictor-corrector finite difference method for standing wave is developed. It is applied to solve the 3D nonlinear potential flow equations with a free surface. The 3D irregular tank is mapped onto a fixed cubic tank through the proper coordinate transform schemes. The cubic tank is distributed by the staggered meshgrid, and the staggered meshgrid is used to denote the variables of the flow field. The predictor-corrector finite difference method is given to develop the difference equations of the dynamic boundary equation and kinematic boundary equation. Experimental results show that, using the finite difference method of the predictor-corrector scheme, the numerical solutions agree well with the published results. The wave profiles of the standing wave with different amplitudes and wave lengths are studied. The numerical solutions are also analyzed and presented graphically. © 2013 Shanghai University and Springer-Verlag Berlin Heidelberg.


Zhou Z.-H.,Kunming University of Science and Technology | Hou K.-P.,Kunming University of Science and Technology | Ren F.-Y.,Northeastern University China
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

The hanging wall and footwall of the XIV1 main ore body are unstable in Fengzishan lead-zinc deposit. The improved sublevel open stope and caving method was tested. Using three-dimensional finite element, the stability analysis of protective pillar and insulating pillar was presented. The distribution of stress, safety rate and plastic zone was analyzed, and the reasonable stope structural parameters were optimized in the four schemes. The results indicate that the thickness of protective layer has a significant influence on the roof stability, which improves with the increase of stope span during the room stoping. In addition, the roof stability decreases with the increase of stope span. It can effectively ensure the stope stability to select the suitable protective layer thickness and to control the stope span. The results can provide theoretical basis for the mining design and strata control.


Wang W.,Kunming University of Science and Technology | Yan Y.,Kunming University of Science and Technology | Zhang L.,Kunming University of Science and Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

To understand well the flowing characters in bulk and seal passage for Francis turbine facing to the fact that the large difference of the space scale between the bulk passage and the seal passage, and to fully consider the interference between the bulk flow and leakage flow, the dynamic Vreman model based on the global equilibrium between the subgrid-scale dissipation and the viscous dissipation with a global model coefficient were applied to large eddy simulation of turbulent flow in complex passage of Francis turbine. Distributions of pressure, velocity and vorticity as well as some flow structure in bulk and leakage passage were gained, simultaneously, scale of seal gap influence on the flowing characters in cavity of labyrinth seals and pressure of head cover were explored. The numerical results show that the swirl vortex in blade passage, tip clearance passage and draft tube are largely influence on the balance of runner unit, also, different vortex structure in labyrinth space are generated due to the difference of seal scale, the energy dissipation are quite different which reflect the different seal leakage flux. © 2012 Chin. Soc. for Elec. Eng.


He Z.,Kunming University of Science and Technology | Tian S.,Kunming University of Science and Technology | Ning P.,Kunming University of Science and Technology
Journal of Rare Earths | Year: 2012

The removal of arsenic from water and wastewater is obligatory. Resin is one of the most effective adsorbents for the removal of arsenic. In order to improve the adsorption capacity of resin, a new cerium-loaded cation exchange resin arsenic adsorbent was prepared by impregnating cerium into the cation exchange resin. Batch adsorption experiments under various conditions, such as time, temperature, pH and with coexisting ions were carried out to evaluate the adsorption characteristics of cerium-loaded resin in the removal of As(V) and As(III) from aqueous solutions. The results showed that the adsorption kinetics of As(V) and As(III) obeyed a pseudo second-order kinetic model and the adsorption rate constants were 0.3159 and 0.5215 g·mg -1·min -1, respectively. The adsorption of As(V) followed the Freundlich adsorption isotherm model and the adsorption isotherm data for As(III) fitted well to the Langmuir equation model. The adsorption capacities were 1.0278 mg/g for As(V) and 2.5297 mg/g for As(III). Both the adsorption of As(V) and As(III) were found to be pH sensitive and the optimum pH was found to be 5-6. Except for the phosphate ion, the coexisting anionics, such as nitrate, chlorate, sulphate and carbonate, showed no remarkable effect on As(V) and As(III) adsorption. The desorption and regeneration study showed that the adsorption capacity of Ce-loaded resin for As(V) and As(III) could be restored to 97.80 and 69.61, respectively, using 0.5 mol/L sodium hydroxide solution. © 2012 The Chinese Society of Rare Earths.


Song P.,Kunming University of Science and Technology
BHR Group - 21st International Conference on Fluid Sealing | Year: 2011

Dry gas seal is commonly used for high pressure gas, and the gas of the dry gas seal is generally considered as an ideal-gas when the dry gas seal is investigated, designed and operated. However, the gas performance may be quite different from the ideal-gas when the pressure is high. This paper presents a method in which the real-gas feature can be considered. The gas compressibility factor Z, a measure of deviation from ideal-gas behaviour, can be determined according to the virial equation of state, and the second virial coefficients can be calculated from the modified Pitzer equation. The spiral groove dry gas seal has been selected as an example. The real-gas equation has been used to modify the pressure controlled equation stemmed from the Muijderman's spiral narrow groove theory. The modified equation has been resolved in order to find the effects of the real-gas. Some familiar gases, such as hydrogen, carbon dioxide, nitrogen, air, have been considered. The results show that the real-gas behaviours have evident effects on the leakage of the dry gas seal if the gas compressibility factor Z is far away from 1, but little effects on the pressure and the opening force. © BHR Group 2011.


Tang X.,Kunming University of Science and Technology | Zhang Y.,Kunming University of Science and Technology | Yi H.,Kunming University of Science and Technology | Ma J.,Kunming University of Science and Technology | Pu L.,Kunming University of Science and Technology
Atmospheric Environment | Year: 2012

A Yunnan Province regional emission inventory for the year 2009 was developed, using the best available domestic emission factors and activity level data for the first time. The inventory covers major emission sources in the region and both bottom-up and top-down approaches were adopted to compile the inventory for those sources where possible. The results show that the estimated emissions for SO 2, NO X, CO 2 and PM 10 in Yunnan Province for the year 2009 were 446.75kt, 486.91kt, 20553.91wt (10 4t) and 467.83kt, respectively. Coal-fired power plants and industrial sources were major contributors of SO 2, NO X and CO 2 emissions, accounting for 84.49%, 73.27% and 68.34% of the total emissions. Biomass burning accounted for 71.62% of total PM 10 emissions. Qujing predominate the total emissions of each species, 33.58% for SO 2, 31.04% for NO X, 24.19% for CO 2, and 15.79% for PM 10. The highest emission density value was up to 5024kg SO 2 km -2 and 5063kg NO X·km -2 in Qujing, 2076 t CO 2·km -2 and 3032kg PM 10·km -2 in Kunming. Furthermore, a qualitative approach was used to characterize the uncertainty of emission inventories, with low uncertainty in SO 2 emission estimates from coal-fired power plant sources, medium to high uncertainties for NO X emissions and CO 2 emissions, and high uncertainty in PM 10. © 2012.


Wang J.,Kunming University of Science and Technology | Xu R.,Kunming University of Science and Technology | Zhang Y.,CAS Shanghai Institute of Ceramics
Journal of Rare Earths | Year: 2012

Ni-W-B composites containing CeO 2 nano-particles on the surface of 45 steel were prepared by pulse electrodeposition, and the influence of pulse frequency, pulse duty circle and heat treatment temperature on the structures and properties were investigated. The results indicated that the pulse co-deposition of Ni, W, B and CeO 2 nano-particles led to Ni-W-B/CeO 2 composites possessing higher microhardness and better wear resistance when heat-treated at 400 °C for 1 h. The microhardness of 636 HV and the deposition rate of 0.0281 mm/h of the as-deposited alloy were the highest at pulse frequency of 1000 Hz, pulse duty circle of 10 and pulse average current density of 10 A/dm 2. The composites were mainly in the amorphous state and were partially crystallized as-deposited, and the crystallization trend was strengthened when heat-treated at 400 °C. Decreasing pulse duty cycle from 75 to 10 was favorable to the refinement in grain structures and improvement of microstructures. The crystal sizes of the composites were smaller by means of pulse electrodeposition. © 2012 The Chinese Society of Rare Earths.


Gao G.B.,Kunming University of Science and Technology | Wang W.,Zhejiang University
Key Engineering Materials | Year: 2012

The measuring space is the set of positions a flexible arm coordinate measuring machine (FACMM) can reach, and it is an important measure for the evaluation of a FACMM. To study the measuring space of FACMMs the kinematic model was established. Furthermore, a new method based on Monte Carlo method to calculate the measuring space of FACMMs was proposed. The method generates the data of joint angles with Monte Carlo method, which is used to calculate the coordinates of the FACMM's probe through the kinematic model. These coordinates make up the measuring space. The results of the analysis on the measuring space show that the measuring space of FACMMs is not a sphere usually considered as but an ellipsoid, and there is lack of flexibility near the border of the measuring space. © (2012) Trans Tech Publications.


Fang H.,Kunming University of Science and Technology
Communications in Nonlinear Science and Numerical Simulation | Year: 2013

This paper is concerned with a food-limited two-species cooperative patch system with harvesting terms. By using Mawhin's coincidence degree theory, this paper establishes a new criterion on the existence of at least eight positive periodic solutions for this system under the assumption of periodicity of the parameters. An example is given to illustrate the effectiveness of the result. The ecological interpretation of the result is also given. © 2012 Elsevier B.V.


Jiang Y.,Kunming University of Science and Technology | Huang S.,Kunming University of Science and Technology
Synlett | Year: 2014

A simple, rapid, one-pot synthesis of arylaminomethyl acetylenes is achieved under microwave-assisted conditions (power = 5 W) using aromatic boronic acids, aqueous ammonia, propargyl halides, copper(I) oxide and water as the solvent. The reactions are complete within ten minutes affording good to excellent yields of the products. © Georg Thieme Verlag Stuttgart. New York.


Xu M.-L.,Kunming University of Science and Technology
Rare Metals | Year: 2014

A successful approach to prepare the Pd-Ni nanowire arrays electrode without carbon supports was reported. The morphology and crystallinity of nanowire were characterized by transmission electron microscopy, selected-area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analyses, respectively. The results show that the diameters of the nanowire are in the range of 65-75 nm, and the polycrystalline binary solid solution alloy is formed in the Pd-Ni nanowire. Cyclic voltammograms, chronoamperograms, and electrochemical impedance spectroscopy demonstrate that the Pd-Ni nanowire arrays electrodes show excellent electrocatalytic performance for methanol oxidation in alkaline media. The catalytic activity of Pd-Ni nanowire arrays electrode is ~1.39 times higher than that of the Pd nanowire arrays electrode and ~2.28 times higher than that of the commercial Pd/C catalyst. This is mostly owing to the transfer of electron density from Ni to Pd. These results indicate that Pd-Ni nanowire arrays electrode is very promising in an alkaline direct methanol fuel cell. © 2014 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.


Yang C.,Kunming University of Science and Technology | Park S.-M.,Ulsan National Institute of Science and Technology
Electrochimica Acta | Year: 2013

Free-standing PbO2 nanowires were prepared by an electrodeposition process onto the titanium foil. The morphology of nanowires was investigated by SEM analyses. The contact angle of the nanowires was compared with that of planar film, which indicated higher hydrophilicity and surface energy of nanowires. Cyclic voltammetric and real-time Fourier transform electrochemical impedance spectroscopy (FTEIS) experiments were employed to study the anodic reaction on the surface. The cyclic voltammetric data showed the overpotential of nanowire array electrode decreased by more than 100 mV compared to that of the planar film electrode at an anodic current density of 400 A/m2. A large body of impedance data acquired from the two electrodes as a function of scanned potential by running combined staircase cyclic voltammetry and FTEIS experiments led to systematic comparative analysis on the electrode/electrolyte interface. The changes in solution resistances, film resistances and capacitances, double layer capacitances, and polarization resistances observed during oxygen evolution process were compared and explained by corresponding electrochemical reactions. The nanowires of PbO2 showed a large active surface area led to higher capacitance than that of the planar electrode. © 2013 Elsevier Ltd. All rights reserved.


Shu H.,Kunming University of Science and Technology | Tian X.,Kunming University of Science and Technology
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2016

An entire-line instant protection based on PCA (Principal Component Analysis) clustering is proposed for DC line, which identifies the short circuit fault direction based on PCA clustering according to the polar line current acquired by the measuring point at the installation location of protection. If the fault direction is forward, the PCA clustering is still used to detect if it is a forward in-zone or out-zone fault. Simulative results and measured data show that, the proposed protection can adapt to different HVDC systems and resist the lightening and harmonic disturbances. © 2016, Electric Power Automation Equipment Press. All right reserved.


Cai D.,South China University of Technology | Wang S.,South China University of Technology | Lian P.,Kunming University of Science and Technology | Zhu X.,CAS Dalian Institute of Chemical Physics | And 3 more authors.
Electrochimica Acta | Year: 2013

A new facile approach is proposed to synthesize nitrogen-doped graphene sheets with the nitrogen-doping level as high as 7.04 at.% by thermal annealing pristine graphene sheets and low-cost industrial material melamine. The high-level nitrogen-doped graphene sheets exhibit a superhigh initial reversible capacity of 1123 mAh g-1 at a current density of 50 mA g -1. More significantly, even at an extremely high current density of 20 A g-1, highly stable capacity of about 241 mAh g-1 could still be obtained. Such an electrochemical performance is superior to those previously reported nitrogen-doped graphene sheets. The excellent electrochemical performance can be attributed to the two-dimensional structure, disordered surface morphology, high nitrogen-doping level, and the existence of pyridinic nitrogen atoms. The results indicate that the high-level nitrogen-doped graphene sheets could be a promising anode material for high-performance lithium-ion batteries. © 2012 Elsevier Ltd.


Zhang L.,South China University of Technology | Wang S.,South China University of Technology | Cai D.,South China University of Technology | Lian P.,Kunming University of Science and Technology | And 3 more authors.
Electrochimica Acta | Year: 2013

A novel cathode material for lithium-ion batteries, carbon-coated Li 3V2(PO4)3 particles which anchored onto graphene sheets (Li3V2(PO4) 3@C/graphene) have been prepared by a modified Pechini method. It is first proposed that the graphene oxide can act as a chelating agent in the reaction process. The nanocomposite is characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and element analysis. The composite shows excellent C-rate performance, delivered capacities of 104, 91 and 85 mAh g-1 at 5, 30 and 50 C in the voltage range of 3.0-4.3 V, respectively. Moreover, the cycling performance is also improved in higher voltage range of 3.0-4.8 V. The capacity retention is 83% with the capacity of 131 mAh g-1 at 10 C after 100 cycles. The outstanding features are desirable and enable the material to be an excellent cathode for lithium-ion batteries. © 2012 Elsevier Ltd. All rights reserved.


Zhang Q.,Kunming University of Science and Technology | Hua Y.,Kunming University of Science and Technology | Wang R.,Kunming University of Science and Technology
Electrochimica Acta | Year: 2013

The oxidation behavior of chloride ions on platinum electrodes was investigated in a natural ionic liquid, 1-butyl-3-methyl-limidazolium tetrafluoroborate (BMIMBF4) in the presence of high concentrations of 1- butyl-3-methyl-limidazolium chloride (BMIMCl). Analysis of the electrode reaction was explored using cyclic voltammetry, and chronoamperometry with a platinum micro-disk electrode, and bulk potentiostatic electrolysis and UV-vis spectroscopy. The anodic oxidation of chloride ions on the platinum micro-disk electrode in the mixture was considered to be an irreversible process with diffusion controlled as revealed by cyclic voltammetry. The diffusion coefficient, D, and the number of electrons transferred, n, for anodic oxidation of Cl- in BMIMBF4 derived from results of chronoamperometry revealed that the oxidation of chloride ions was more likely to form tri-chloride ion, Cl3 - but not chlorine, Cl 2. Bulk electrolysis and UV-vis spectroscopy further confirmed that the tri-chloride ion was the main product from the overall oxidation of the chloride ion. © 2013 Elsevier Ltd. All rights reserved.


TIAN G.-c.,Kunming University of Science and Technology | LI J.,Kunming University of Science and Technology | HUA Y.-x.,Kunming University of Science and Technology
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2010

Ionic liquids as green solvents have shown important application in the extraction and separation of nonferrous metals. The new application perspective, the important fundamental and the applied studies of the extraction and separation of nonferrous metals in ionic liquids, including the dissolution and corrosion of metal and metal oxide, hydrometallurgy of chalcopyrite and metallic oxidized ore, and extraction and separation of metal ions, are introduced. © 2010 The Nonferrous Metals Society of China.


Zhang Y.,Kunming University of Science and Technology | He Z.,Kunming University of Science and Technology | Wu X.,Kunming University of Science and Technology
Pattern Recognition | Year: 2011

This work presents a global energy minimization method for multiscale image segmentation using convex optimization theory. The construction of energy function is motivated by the intuition that the larger the entropy, the less a priori information one has on the value of the random variables. First, we represent the wavelet-domain hidden Markov tree (WHMT) model of the original image as a structured energy function, which is proved convex in marginal distributions. Next, we derive the maximum lower bound of the energy function through Lagrange dual transform for the purpose of incorporating marginal constraints into optimization. Finally, a modified belief propagation optimization algorithm is used to perform global energy minimization of the dual convex energy function. Experiments on real image segmentation problems demonstrate the superior performance of this new algorithm when compared with nonconvex ones. © 2011 Elsevier Ltd. All rights reserved.


Zhang F.,Zhejiang University | Zhang F.,Kunming University of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2013

There is no doubt that efficient fresh agricultural products supply chain management is the key to improve the competitiveness of fresh produce enterprises, and the appearance of things brings a new opportunity for fresh agricultural products supply chain management. At present, there is still a big gap between theoretical research and practical applications, Especially in China, most of the literature of the IOT still remain in the introduction of the IOT itself and its application, but with the development of the relevant technology and the deepening of theoretical research and application, the IOT will play a positive role in the development of the fresh agricultural products supply chain in the future, it will also become an important direction of future research. So, the future of the IOT's application in fresh agricultural products supply chain management is bright, but the road is tortuous. © 2013 Springer-Verlag.


He X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2012

This paper investigates normal stress distribution of a single-lap adhesively bonded joint under tension using the three-dimensional finite element methods. Five layers of solid elements were used across the adhesive layer thickness in order to obtain an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region, which is very close to the left free end of the adhesive layer, is subjected to very high stress and the magnitude of the normal stress oscillates in value close to the left end of the adhesive layer. © (2012) Trans Tech Publications, Switzerland.


Li Y.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Yin F.,Kunming University of Science and Technology | Yang X.,Kunming University of Science and Technology | Hu Y.,Kunming University of Science and Technology
Environmental Science and Pollution Research | Year: 2014

A field survey was conducted to investigate the present situation and health risk of arsenic (As), lead (Pb), cadmium (Cd), copper (Cu), and zinc (Zn) in soils and vegetables in a multi-metal mining area, Gejiu, China. Furthermore, three vegetables (water spinach, potato, and summer squash) containing high metal concentrations were selected to further analyze metal speciation. The results showed that the average concentrations of five metals in soil exceeded the limiting values, and their bioavailable concentrations were significantly positively correlated to the total ones. Heavy metals in the edible parts of vegetables also exceeded the corresponding standards. The leaves of pakchoi, peppermint, and coriander had a strong metal-accumulative ability and they were not suitable for planting. Except the residue forms, the main forms of metals in the edible parts of three selected vegetables were ethanol-, NaCl-, and HAc-extractable fractions for As, Pb, and Cd, respectively; however, Cu was mainly presented as NaCl-extractable and Zn as HAc-extractable fractions. A high proportion of ethanol-extractable As showed that As bioactivity and toxic effects were the highest. Although the total and bioavailable Cd were high in soil, its speciation in vegetables was mainly presented as HAc-extractable fraction, which has a relatively low bioactivity. Lead and arsenic were imposing a serious threat on the local residents via vegetable consumption. © 2014, Springer-Verlag Berlin Heidelberg.


Zhu X.,Kunming University of Science and Technology | Li K.,Kunming University of Science and Technology | Wei Y.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Sun L.,Kunming University of Science and Technology
Energy and Fuels | Year: 2014

Chemical-looping steam methane reforming (CL-SMR) is a promising method for the co-generation of pure hydrogen and syngas on the basis of redox cycles via a gas-solid reaction using an oxygen carrier. The performance and life of the oxygen carrier play pivotal roles in determining the feasibility and economy of the CL-SMR process. The present research was focused on the evolution of the structure and reducibility of a CeO2-Fe2O3 oxygen carrier during the CL-SMR redox process to further understand the sustainability of the oxygen carrier. The investigated CeO2-Fe 2O3 complex oxide exhibited satisfactory performance in the CL-SMR process because of the chemical interaction between Ce and Fe species. A Ce-Fe-O phase equilibrium based on a stable composition of CeO 2, Fe3O4, and CeFeO3 formed in the recycled samples. Surface oxygen was removed, which was accompanied by an increase in the concentration of oxygen vacancies and a decrease in the surface area of the recycled samples; these effects resulted in an increase in the high-temperature reducibility and syngas selectivity of the samples. Oxygen mobility was intensified by the Ce-Fe chemical interaction via the formation of CeFeO3 and a micromorphological transformation. These properties counteracted the sintering of the materials and guaranteed the stability of the oxygen carrier in the CL-SMR process. © 2014 American Chemical Society.


Ye Y.,CAS Shanghai Institutes for Biological Sciences | Zhao Y.,Kunming University of Science and Technology
Plant Signaling and Behavior | Year: 2016

Seed dormancy and germination are the most important adaptive traits of seed plants, which control the germination in a proper space and time. Internal genetic factors together with environmental cues govern seed dormancy and germination. Abscisic acid (ABA), a key phytohormone induces seed dormancy and inhibits seed germination through its molecular genetic signaling network responding the seed inherent physiological and environmental factors. Recently, auxin has been shown to be another phytohormone that induces seed dormancy. We have recently shown that germonstatin (GS), a small synthetic molecule identified by high through-put chemical genetic screenings, inhibits seed germination through upregulating auxin signaling and inducing auxin biosynthesis. GERMOSTATIN RESISTANCE LOCUS 1 (GSR1) encodes a plant homeodomain (PHD) finger protein and is responsible for GS seed germination inhibition. Its knockdown mutant gsr1 displays decreased dormancy. In this report, we show that GS is not an ABA analog and provided 2 other GS-resistant mutants related to the chemical’s function in seed germination inhibition other than gsr1, suggesting that GS may have pleiotropic effects through targeting different pathway governing seed germination. © 2016 Taylor & Francis Group, LLC.


Han C.,Kunming University of Science and Technology | Pu H.,Kunming University of Science and Technology | Li H.,Kunming University of Science and Technology | Deng L.,Kunming University of Science and Technology | And 3 more authors.
Journal of Hazardous Materials | Year: 2013

The Box-Behnken Design of the response surface methodology was employed to optimize four most important adsorption parameters (initial arsenic concentration, pH, adsorption temperature and time) and to investigate the interactive effects of these variables on arsenic(V) adsorption capacity of mesoporous alumina (MA). According to analysis of variance (ANOVA) and response surface analyses, the experiment data were excellent fitted to the quadratic model, and the interactive influence of initial concentration and pH on As(V) adsorption capacity was highly significant. The predicted maximum adsorption capacity was about 39.06mg/g, and the corresponding optimal parameters of adsorption process were listed as below: time 720min, temperature 52.8°C, initial pH 3.9 and initial concentration 130mg/L. Based on the results of arsenate species definition, FT-IR and pH change, As(V) adsorption mechanisms were proposed as follows: (1) at pH 2.0, H3AsO4 and H2AsO4 - were adsorbed via hydrogen bond and electrostatic interaction, respectively; (2) at pH 6.6, arsenic species (H2AsO4 - and HAsO4 2-) were removed via adsorption and ion exchange, (3) at pH 10.0, HAsO4 2- was adsorbed by MA via ion exchange together with adsorption, while AsO4 3- was removed by ion exchange. © 2013 Elsevier B.V.


Wu M.,Kunming University of Science and Technology | Pan B.,Kunming University of Science and Technology | Zhang D.,Kunming University of Science and Technology | Xiao D.,Kunming University of Science and Technology | And 3 more authors.
Chemosphere | Year: 2013

Biochars were produced using a Dianchi Lake sediment at different temperatures and their sorption characteristics with five organic contaminants (with solubilities varied three orders of magnitude) were compared. Freundlich model showed satisfying fitting results of the sorption isotherms. Distinct decrease of nonlinear factors was observed for all five contaminants with pyrolysis suggesting wider energy distribution of the sorption sites after pyrolysis. No clear trend was observed between Kd and the chemical properties of the five chemicals. Phenanthrene and sulfamethoxazole (SMX) showed increased sorption with increased pyrolysis temperature, while the sorption of bisphenol A (BPA), ofloxacin (OFL) and norfloxacin (NOR) in the original sediment was comparable to those in the thermally treated samples. Electrostatic repulsion played an important role in SMX sorption as suggested by its lowest hydrophobicity-normalized sorption coefficients among the five chemicals. Possible sorption mechanisms were discussed and the sorption of SMX and PHE on the produced biochars were compared with natural adsorbents (including soils, sediments, and inorganic mineral particles). © 2012 Elsevier Ltd.


Yang S.,Kunming University of Science and Technology | Yang S.,Southwest forestry University | Zhou D.,Kunming University of Science and Technology | Yu H.,Zhejiang Environmental Engineering Co. | And 2 more authors.
Environmental Pollution | Year: 2013

The distribution and chemical speciation of typical metals (Cu, Zn, Cd and Pb) in agricultural and non-agricultural soils were investigated in the area of Nanpan River, upstream of the Pearl River. The investigated four metals showed higher concentrations in agricultural soils than in non-agricultural soils, and the site located in factory district contained metals much higher than the other sampling sites. These observations suggested that human activities, such as water irrigation, fertilizer and pesticide applications might have a major impact on the distribution of metals. Metal speciation analysis presented that Cu, Zn and Cd were dominated by the residual fraction, while Pb was dominated by the reducible fraction. Because of the low mobility of the metals in the investigated area, no remarkable difference could be observed between upstream and downstream separated by the factory site. © 2013 Elsevier Ltd. All rights reserved.


Li K.-J.,CAS National Astronomical Observatories | Liang H.-F.,Yunnan Normal University | Feng W.,Kunming University of Science and Technology
Research in Astronomy and Astrophysics | Year: 2010

Sunspot groups observed by the Royal Greenwich Observatory/US Air Force/NOAA from 1874 May to 2008 November and the Carte Synoptique solar filaments from 1919 March to 1989 December are used to investigate the relative phase shift of the paired wings of butterfly diagrams of sunspot and filament activities. Latitudinal migration of sunspot groups (or filaments) does asynchronously occur in the northern and southern hemispheres, and there is a relative phase shift between the paired wings of their butterfly diagrams in a cycle, making the paired wings spatially asymmetrical on the solar equator. It is inferred that hemispherical solar activity strength should evolve in a similar way within the paired wings of a butterfly diagram in a cycle, demonstrating the paired wings phenomenon and showing the phase relationship between the northern and southern hemispherical solar activity strengths, as well as a relative phase shift between the paired wings of a butterfly diagram, which should bring about almost the same relative phase shift of hemispheric solar activity strength.


Wu F.,Chinese Research Academy of Environmental Sciences | Bai Y.,Chinese Research Academy of Environmental Sciences | Mu Y.,Chinese Research Academy of Environmental Sciences | Pan B.,Kunming University of Science and Technology | And 2 more authors.
Environmental Pollution | Year: 2013

Fullerene can be suspended in water as nanoscaled-fullerene-aggregates (nC60). However, little is known about its biogeochemical cycling in natural waters. In this paper, the interactions between nC60 and fulvic acids were investigated using fluorescence spectroscopy and fluorescence quenching titration. The results show that the intrinsic fluorescence of fulvic acids was static quenched by adding nC60. The association constants (log K) of fulvic acids and nC60 were estimated using a modified Ryan-Weber nonlinear model, and ranged from 6.76 to 7.41 l/mol. The log K was not significantly affected by the concentration levels of fulvic acids from 5.0 to 20.0 mg/l. The log K increased at low pH 3-5, but remained constant at high pH ranging from 5 to 11. The hydrophobic and π-π interactions were the likely primary mechanisms. The present observation will be helpful in understanding the environmental behavior of fullerene in natural aquatic ecosystems. © 2012 Published by Elsevier Ltd.


Zhao Z.,Kunming University of Science and Technology | He X.,Kunming University of Science and Technology | Yi J.,Kunming University of Science and Technology | Ma C.,Kunming University of Science and Technology | And 2 more authors.
RSC Advances | Year: 2013

Recent experimental literature (Sol. Energ. Mat. Sol. Cells, 2012, 105, 192) has reported that nitrogen doped Cu2O is a possible material for novel intermediate band solar cells. The doping effects of nitrogen on the crystal structure, electronic structure, and optical properties of Cu 2O have been studied by an ultrasoft pseudopotential plane wave method based on first-principles calculations. The results show that nitrogen doping slightly widens the band gap of Cu2O, and form an intermediate band in the gap located at about 0.9 eV from the VBM (or CBM). This intermediate band is predominantly formed by hybridization between the N-2p states and the Cu-3d states. N-doped Cu2O is very likely to absorb at a maximum across the solar light spectrum, from the near infrared region to the ultraviolet region. Based on these results, N-doped Cu2O is considered to be a perfect intermediate band material for a novel kind of solar cells. This journal is © The Royal Society of Chemistry.


Zhang R.,Kunming University of Science and Technology | Guo R.,Kunming University of Science and Technology | Wang S.,Kunming University of Science and Technology
Engineering Fracture Mechanics | Year: 2014

The optical method of digital gradient sensing is used to the study of fracture characteristics. Fracture experiments are performed on PMMA specimens with different offset crack under three-point-bending, which is appropriate for mixed-mode fracture analysis. The full-field displacements around the crack-tip are used to study the fracture characteristics such as evaluation of deformation field, crack tip stress gradients, and crack initiation. Mixed-mode stress intensity factors and crack tip location are calculated simultaneously from DGS data by fitting the analytically angular deflections (or in-plane gradients of stresses) field using the method of nonlinear least-squares and are in good agreement with finite element results. © 2014 Elsevier Ltd.


Guo P.,Kunming University of Science and Technology | Liu M.,Kunming University of Science and Technology
MATEC Web of Conferences | Year: 2016

This paper presents an architectural style based modelling approach for architectural design, analysis of mobile systems. The approach is developed based on UML-like meta models and graph transformation techniques to support sound methodological principals, formal analysis and refinement. The approach could support mobile system development. © Owned by the authors, published by EDP Sciences, 2016.


Mahyuddin M.N.,University of Bristol | Mahyuddin M.N.,Universiti Sains Malaysia | Na J.,Kunming University of Science and Technology | Herrmann G.,University of Bristol | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2014

A novel observer-based parameter estimation scheme with sliding mode term has been developed to estimate the road gradient and the vehicle weight using only the vehicle's velocity and the driving torque. The estimation algorithm exploits all known terms in the system dynamics and a low-pass filtered representation of the dynamics to derive an explicit expression of the parameter estimation error without measuring the acceleration. The proposed parameter estimation scheme which features a sliding-mode term to ensure the fast and robust convergence of the estimation in the presence of persistent excitation is augmented to an adaptive observer and analyzed using Lyapunov Theory. The analytical results show that the algorithm is stable and ensures finite-time error convergence to a bounded error even in the presence of disturbances. In the absence of disturbances, convergence to the true values in finite time is guaranteed. A simple practical method for validating persistent excitation is provided using the new theoretical approach to estimation. This is validated by the practical implementation of the algorithm on a small-scaled vehicle, emulating a car system. The slope gradient as well as the vehicle's mass/weight are estimated online. The algorithm shows a significant improvement over previous results. © 1982-2012 IEEE.


Zhang W.,Kunming University of Science and Technology | Chen Z.,Kunming University of Science and Technology | Shen Y.,Kunming University of Science and Technology | Shu G.,Tianjin University | And 3 more authors.
Energy | Year: 2013

Oxygen-enriched combustion of diesel engine can reduce smoke emission and improve thermal efficiency, but also lead to the increase of NO emission. In this research, experiments were conducted on a turbo-charged direct injection diesel engine under the two conditions of 2000rpm and 180Nm equivalent power (57% of the original max load at 2000rpm) as well as 100% load of this speed. The combination of intake oxygen enrichment and water emulsified diesel was used to improve the NO-smoke emissions without serious penalty in brake specific fuel consumption (BSFC). The results showed that when engine load was 180 Nm with the conditions of 0%-20% water emulsion ratio and 21%-21.5% intake oxygen concentration, as well as under the condition of 100% load with 10%-15% water emulsion ratio and 21%-22% intake oxygen concentration, the NO-Smoke emissions were lower than that of original engine and BSFC was not exceeding 5% of the original engine by optimized combination of water emulsion ratio and oxygen concentration. © 2013 Elsevier Ltd.


Na J.,Kunming University of Science and Technology | Herrmann G.,University of Bristol
IEEE/CAA Journal of Automatica Sinica | Year: 2014

This paper proposes an online adaptive approximate solution for the infinite-horizon optimal tracking control problem of continuous-time nonlinear systems with unknown dynamics. The requirement of the complete knowledge of system dynamics is avoided by employing an adaptive identifier in conjunction with a novel adaptive law, such that the estimated identifier weights converge to a small neighborhood of their ideal values. An adaptive steady-state controller is developed to maintain the desired tracking performance at the steady-state, and an adaptive optimal controller is designed to stabilize the tracking error dynamics in an optimal manner. For this purpose, a critic neural network (NN) is utilized to approximate the optimal value function of the Hamilton-Jacobi-Bellman (HJB) equation, which is used in the construction of the optimal controller. The learning of two NNs, i.e., the identifier NN and the critic NN, is continuous and simultaneous by means of a novel adaptive law design methodology based on the parameter estimation error. Stability of the whole system consisting of the identifier NN, the critic NN and the optimal tracking control is guaranteed using Lyapunov theory; convergence to a near-optimal control law is proved. Simulation results exemplify the effectiveness of the proposed method. © 2014 IEEE.


Nian H.,Kunming University of Science and Technology | Wang G.,Kunming University of Science and Technology | Chen L.,Kunming University of Science and Technology
World Journal of Microbiology and Biotechnology | Year: 2012

Aluminum (Al) toxicity is a major factor that limits crop productivity in acid soils. The toxic effects of Al exposure on Al-tolerant Cryptococcus humicola were analyzed at the physiological level. The exposure to 20 mM Al led to a clear increase in malondialdehyde content and a significant decrease in the levels of protein carbonyls, suggesting that Al stress caused oxidative damage to membrane lipids but not to proteins. Suppression subtractive hybridization (SSH) results showed that when C. humicola was exposed to 20 mM Al, a total of 141 ESTs were differentially expressed. Of them, 27 had unknown functions and 48 were newly identified in this study. The genes with known functions were categorized into seven groups. The largest group was related to metabolism and energy, followed by protein synthesis and processing, cell structure, signal transduction and transcription, transporters, stress and defense. Reverse transcription (RT)-PCR analysis of certain genes was performed to confirm the reliability of the SSH data. Nine selected genes were upregulated by Al in a time-dependent manner. The potential functions of some genes involved in Al-tolerance were predicted and are discussed. The diversity of the putative functions of these genes indicates that Al stress results in a complex response in C. humicola. © 2012 Springer Science+Business Media B.V.


An C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The max level sliding distance of Zhu Quedong landslide is 80m; its vertical sliding distance is 50.0m. An the sliding axle, the sliding mass length is about 450.0m, which perpendicular to Changde-Jishou expressway; the leading edge width at hillside foot is about 500m and the sliding mass width along Changde-Jishou expressway is about 430.0m. Its volume is about 2.6×106m³. The direct economic loss is about 3.192×107RMB. According to geology investigation, the geological structures control the landslide: fault F1and fault F2 control the boundary of landslide, the stratum attitude controls the slip direction. Rainfall and river erosion are the major factors to cause the landslide. Multiple sliding formed Zhu Quedong landslide outline and there is different failure model in different area. In I-1 sub region, the failure model is creeping-tensile for slope foot loses support caused by river erosion; in I-2 sub region, the failure model is slip-buckling- tensile caused by the lateral drag force of I-1 sub region slipping, in I-3 sub region, the failure model is slip-tensile with rotation-slide for its foot loses support caused by I-1 sub region and I-2 sub region slipping and uneven stacking load cause by subgrade construction, in I-4 sub region, the failure model is slip-tensile. In II area, the slope failure model is shear deformation by lateral forces of I area slipping. In III area, the slope failure model is slip-tensile because the slope foot loses support caused by I area sliding. © (2014) Trans Tech Publications, Switzerland.


He X.C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

This paper describes some finite element combinations to analyse the mechanical behaviour of bonded joints. In finite element models five layers of solid elements were used across the adhesive layer in order to increase the accuracy of the results. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most of the adherends and adhesive were modeled using solid brick elements but some solid triangular prism elements were used for a smooth transition. Comparisons are performed between different types of first-order element combinations in order to find a suitable model to predict the mechanical behaviour of adhesively bonded joints.


Peng J.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

This work presents a method for metal coating of the surface of optical fiber by means of electroless and electroplating. No vacuum techniques or any high-temperature methods are required. The coating method presented in this work is developed with emphasis to further embedding the coated fibres into solid metal using. The method is based on electroless and electroplating, and therefore, the fibres can be coated with any metal or metal alloy applicable by this technique. © (2014) Trans Tech Publications, Switzerland.


Zheng Y.,Kunming University of Science and Technology | Wang S.,Kunming University of Science and Technology | Sunkar R.,Oklahoma State University
PLoS ONE | Year: 2014

Phased small interfering RNA (phasiRNA) generating loci (briefly as PHAS) in plants are a novel class of genes that are normally regulated by microRNAs (miRNAs). Similar to miRNAs, phasiRNAs encoded by PHAS play important regulatory roles by targeting protein coding transcripts in plant species. We performed a genome-wide discovery of PHAS loci in Chinese sacred lotus and identified a total of 106 PHAS loci. Of these, 47 loci generate 21 nucleotide (nt) phasiRNAs and 59 loci generate 24 nt phasiRNAs, respectively. We have also identified a new putative TAS3 and a putative TAS4 loci in the lotus genome. Our results show that some of the nucleotide-binding, leucine-rich repeat (NB-LRR) disease resistance proteins and MYB transcription factors potentially generate phasiRNAs. Furthermore, our results suggest that some large subunit (LSU) rRNAs can derive putative phasiRNAs, which is potentially resulted from crosstalk between small RNA biogenesis pathways that are employed to process rRNAs and PHAS loci, respectively. Some of the identified phasiRNAs have putative trans-targets with less than 4 mismatches, suggesting that the identified PHAS are involved in many different pathways. Finally, the discovery of 24 nt PHAS in lotus suggests that there are 24 nt PHAS in dicots. © 2014 Zheng et al.


Li F.,Kunming University of Science and Technology | Li Z.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2014

Attempt to improve the hard phase morphology and properties of non-chromium hypoeutectic Fe-C-B alloy containing 0.36 wt.% C and 1.48 wt.% B by the thermomechanical treatment, which is a integrated process of hot deformation and quenching, is reported in the paper. The experiment results show that hot deformation can crush the continuous hard phase network in the alloy into gathered particles, and quenching under different austenitizing temperature make the hard phase particles in the deformed samples tend to merge and present stripe and bulk dispersed distribution in the matrix. Analysis results indicate that with the increase of austenitizing temperature, the volume of hard phase in the alloy reduced while the morphology of it tends to form continuous network shape again. Such change of hard phase morphology has significant effect on the properties especial impact value and wear resistance of the alloy. When the alloy was deformed and quenched at 1050 C, it reaches 58HRC of hardness and 9.3 J of impact value, which is much higher than that of untreated alloy, and the wear resistance of it is very close to heat-treated Cr20Mo high chromium cast iron while the impact value is much better. © 2013 Elsevier B.V. All rights reserved.


Li M.M.,Kunming University of Science and Technology | Shao Y.H.,Kunming University of Science and Technology | Xu S.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Based on the analysis of the properties of a high carbon pyrite from Yunnan, a series tests on gravity concentration and flotation were carried out. According to this basis, a closed-circuit flotation test scheme was worked out, which obtained a fine quality pyrite concentrate with a sulfur grade of 38.24%, comprehensive sulfur recovery of 70.87% and carbon content of only 0.87%. © (2014) Trans Tech Publications, Switzerland.


Ren B.C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock's displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass' rupture regularity can be helpful for the control of surrounding rock's stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation. © (2014) Trans Tech Publications, Switzerland.


Zhang P.L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Shear wall systems are the most commonly used lateral load resisting systems in high seismic zones because they provide significant lateral strength, stiffness, and deformation capacity. The work further investigates the seismic performance of different kinds of shear walls. Classified and brief comments about the seismic performance and the exist drawback of different kinds of shear walls and its application are conducted. Lastly, some useful suggestions and a new structure are proposed for the further research. © (2014) Trans Tech Publications, Switzerland.


Zhang P.L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

To study the seismic behavior of short pier shear wall, 6 short pier shear wall specimens are tested under low cyclic loading with axial load ratio of 0.2. Hysteretic rules and stiffness degradation rate are determined base on test results and feature points are defined by theory, restoring force model that considers the effect of two loading direction to hysteretic characteristics is proposed based on test research, which could be applied to the nonlinear dynamic analysis of the structure. © (2014) Trans Tech Publications, Switzerland.


Duan Y.H.,Kunming University of Science and Technology | Duan Y.H.,Key Laboratory of Advance Materials in Rare and Precious and Nonferrous Metals | Sun Y.,Kunming University of Science and Technology | Peng M.J.,Kunming University of Science and Technology | Zhou S.G.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2014

The effects of high pressure on elastic properties and electronic structures of L12 structure trialuminide Al3Sc and Al 3Y compounds have been investigated by first-principles calculations within the local density approximation. The elastic properties and Debye temperature for Al3Sc and Al3Y increase with the increasing pressure, and the calculated values in elastic properties and Debye temperatures which obtained at 0 GPa are in good agreement with the available experiment data. The mechanical anisotropic properties are discussed using universal anisotropic index AU and Zener anisotropy index A Z. The calculated electronic properties suggest that a significant amount of charge in the interstitial region gives rise to an enhanced directional covalent-type bonding between the Sc (Y) and Al atoms as the pressure is up to 40 GPa. © 2013 Elsevier B.V. All rights reserved.


Wan F.X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Fire-resistance performance of slabs can be improved if the slab strengthened by carbon fiber sheet bonded with inorganic adhesive instead of organic epoxy adhesive with low softening temperature. However, Fire-resistance performance of the strengthened slabs is not understood fully. Considering this issue, finite element analysis is done. Stating from building valid model of finite element, computing results are compared with experimental results, and rationality of the model is verified. Then plenty of parameter analysis is done. Effect of some parameters, such as range of carrying capacity increase by sheet, reinforcement ratio, load ratio to carrying capacity and thickness of slab, on fire-resistance performance of the strengthened slab is analysis. The results demonstrate that thickness of slab is the main factors influencing fire-resistance performance of the slab strengthened by carbon fiber sheet bonded with inorganic adhesive. While, range of carrying capacity increase by sheet, width of section and load ratio to carrying capacity have little influence on it. Slabs, strengthened by carbon fiber sheet bonded with inorganic adhesive, and protected by Thick-typed Fireproof Coating, perform good fire behavior. © (2014) Trans Tech Publications, Switzerland.


Hu X.-G.,Kunming University of Science and Technology | Cheng H.-M.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

In the evolutionary structural optimization (ESO) using the rejection ratio, the criterion of the inefficient material removal can't generally be lowered during the optimization process because the rejection ratio can't be decreased. Owing to this, some sorts of structures in special load cases cannot be optimized smoothly; or the late optimization of an ordinary structure is terminated suddenly when the removal of material abruptly increases excessively. The paper puts forward the Evolutionary Structural Optimization using Material Efficiency Grades (ESO-MEG) in order to eliminate the unfavorable effects of the rejection ratio on the results of ESO. The ESO-MEG can determine inefficient material in a structural optimization according to the efficiency grades of each part of material, so it can adjust timely and flexibly the criterion of inefficient material removal. The research shows that the ESO-MEG is applicable to the optimization of different sorts of structures in varying sorts of load cases, so generalization of this method has a broad prospect. © (2014) Trans Tech Publications, Switzerland.


Xie H.-T.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Traditional surrounding rockmass classification methods have disadvantages of relative narrow scope of application, most of the time the classification result needs some modifications by geological expert and field situation. Based on the surrounding rockmass classification methods of BQ system, the Bayesian network and corresponding uncertainty reasoning principle has been introduced to develop an expert system for surrounding rockmass classification. By combining prior knowledge of domain experts with worksite data recorder, we get the posterior probability density of most nodes. The field practices proved that the expert system has good applicability. © (2014) Trans Tech Publications, Switzerland.


Ding M.L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The optimal path algorithm analysis of GPS navigation in taxi management system based on A* algorithm was introduced in this paper. Through improving the traditional Dijkstra algorithm and avoiding problems such as "time-consuming and low efficiency" in Dijkstra algorithm with traversal search for each node, A* algorithm could help the taxi find the optimal path and bring convenience for traffic management. © (2014) Trans Tech Publications, Switzerland.


Zhang M.S.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

This research takes the construction of characteristics specialty of electronic information and technology at Oxbridge College, KUST as the subject to study how to program specialty distinct from that of other Universities. Based on the necessity of the characteristics specialty, this paper defines what is called characteristics specialty, sets forth the target, the approach, the plan and procedures about how to cultivate the characteristics and presents some issues to be studied. © (2014) Trans Tech Publications, Switzerland.


Ding M.L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The design and implement of remote data acquisition system based on ARM-Linux ARM and embedded Linux was introduced in this paper. Except the introduction of its structure, the implementation process of A/D driver and the web server BOA in the software design process was also emphasized in this paper to achieve remote access A/D data change. © (2014) Trans Tech Publications, Switzerland.


Wan F.X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Because of high temperature above 1000°C on fire, and Oxidation of carbon fiber at high temperature, fireproofing measure should be make to take advantage of the inorganic adhesive for beams strengthened by carbon fiber sheet bonded with the adhesive. The problem of which fireproofing material should be choose and how to make fireproofing measure needs to resolve. Fireproofing test is make for beams strengthened by carbon fiber sheet bonded with the adhesive protected by Thick-typed Fireproof Coating for steel structure (TFCSS) and Thick-typed Fireproof Coating for tunnel (TFCT). Typical damage state of the two typical coating is compared on and after fire, Temperature field of specimen is analyzed, and fireproofing effect is compared. The test results indicate that, under the protection of fireproof coating with proper structure, TFCT and TFCSS can supply effective fireproofing protection for carbon fiber sheet, but the former is inferior to the latter because the latter is easier to drop and crack in fire. © (2014) Trans Tech Publications, Switzerland.


Lian P.,Kunming University of Science and Technology | Wang J.,Kunming University of Science and Technology | Cai D.,South China University of Technology | Liu G.,South China University of Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

Tin is a promising high-capacity anode material for lithium-ion batteries, but it usually suffers from the problem of poor cycling stability due to the large volume change during the charge-discharge process. In this article, porous nano-sized Sn@C/graphene electrode material with three-dimensional carbon network was designed and prepared. Reducing the size of the Sn particles to nanoscale can mitigate the absolute strain induced by the large volume change during lithiation-delithiation process, and retard particle pulverization. The porous structure can provide a void space, which helps to accommodate the volume changes of the Sn nanoparticles during the lithium uptake-release process. The carbon shell can avoid the aggregation of the Sn nanoparticles on the same piece of graphene and detachment of the pulverized Sn particles during the charge-discharge process. The 3D carbon network consisted of graphene sheets and carbon shells can not only play a structural buffering role in minimizing the mechanical stress caused by the volume change of Sn, but also keep the overall electrode highly conductive during the lithium uptake-release process. As a result, the as-prepared Sn@C/graphene nanocomposite as an anode material for lithium-ion batteries exhibited outstanding cyclability. The reversible specific capacity is almost constant from the tenth cycle to the fiftieth cycle, which is about 600 mA h g-1. The strategy presented in this work may be extended to improve the cycle performances of other high-capacity electrode materials with large volume variations during charge-discharge processes. © 2014 Published by Elsevier B.V. All rights reserved.


Liu L.L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

According to the supply network collaboration and its influence on the whole performance of supply network, the index system for collaboration client evaluation is set up. In this system, the weight of each index is determined by its importance in supply network of manufacturing cluster. In addition, the related evaluation decision-making model is established based on the grey characteristic of information and the empirical analysis is performed finally. © (2014) Trans Tech Publications, Switzerland.


Density functional theory and the hard and soft acid-base theory are widely used in quantum mechanics and computational chemistry. This article combined them to describe the iron oxide adsorption of humic acid free energy relationship, and predict the free energy relationship equation, which plays an important role for the study of the formation mechanism of organo-mineral complexes in soil carbon sequestration. © (2014) Trans Tech Publications, Switzerland.


Duan Y.H.,Kunming University of Science and Technology | Duan Y.H.,Key Laboratory of Advance Materials in Rare and Precious and Nonferrous Metals | Huang B.,Kunming University of Science and Technology | Sun Y.,Kunming University of Science and Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

To better clarify and understand the phase stability and elastic properties of stable Zr-Al binary intermetallic compounds, the structural properties, phase stability, elastic properties, and electronic structures of these compounds in Zr-Al system have been systematically investigated by using first-principles calculations. The calculated equilibrium structures and enthalpies of formation in present work are in good agreement with the available experimental and other theoretical data, and the results of enthalpies of formation show that ZrAl2 is the most stable. The elastic properties, including elastic constants, Poisson's ratio and anisotropy index, and Debye temperatures were also investigated. It is found that ZrAl is the most anisotropic in Zr-Al binary compounds. Furthermore, the electronic structures were discussed to reveal the bonding characteristics of the compounds. © 2013 Elsevier B.V. All rights reserved.


Zhang P.,Kunming University of Science and Technology
World Information on Earthquake Engineering | Year: 2012

Stress distribution is complex and changeable drastically in RC structure under earthquake effect because of stress redistribution, the changing process can be reflected through strain evolution. Stress changing process reappeared by tracing strain evolution of six T-shaped short pier shear wall specimens under low cyclic loading. Based on the above research, failure mode of specimens was accurately analyzed to find the weakest parts of the specimens. Some suggestions were proposed for strengthening the weakest parts, the applicability of plane-section assumption was investigated too.


Leng T.T.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Wu J.D.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

This paper introduces two models for calculating friction loss in slurry pipeline. Based on the comparison between the measured pressure loss of the highly concentrated iron ore concentrate slurry pipeline in Dahongshan, Yunnan Province, CHINA and the calculation outcomes of the two models, the model which can predict pressure loss in this kind of slurry pipelines has been found. © (2014) Trans Tech Publications, Switzerland.


Wu T.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

DS18B20 temperature sensor is a-wire bus sensor, which can directly output digital signal and is less influenced by external interference. Its measurement accuracy is high. Freescale microcontroller is used to develop this system, which has reliable performance. It could ensure that its regular use in the actual production and living. The program is compiled in Freescale CodeWarrior integrated development environment. Experiment result states clearly that this system can monitor and display environment temperature in real-time. It has practical value. © (2014) Trans Tech Publications, Switzerland.


Pan N.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

For the outstanding problems of traditional vehicle foundation braking performance testing systems’ such as lacking of test&analysis methods, inflexible and not easy to carry, a multi-channel Vehicle foundation break performance testing system based on CompactRIO embedded platform and LabVIEW was developed. The system design concept and concrete implementation of the key technologies such as parallel acquisition and data transmission, large data processing and time-frequency noise reduction were all introduces in detail. Actual break test experiment shows the effectiveness and reliability of the system. © (2014) Trans Tech Publications, Switzerland.


Hou H.-Y.,Kunming University of Science and Technology
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2014

Alkaline polymer electrolyte membrane fuel cell (APEMFC) has received much recent attention, primarily motivated by their fast dynamics and independence on expensive Pt-based electrocatalysts. As one of vital components of APEMFC, the alkaline polymer membrane directly influences their performance and cost. However, to date, no alkaline membrane has provided a satisfactory benchmark for use in APEMFC. Therefore, intensive efforts have been made to pursue desirable polymer membrane materials. In this article, the research progress over the last 3 years on state-of-the-art alkaline polymer electrolyte membranes for APEMFC is reviewed, including various synthesis strategies, structure-property relationships, water management, and ex situ and in situ stability tests. More specifically, some new metal- cation- based anion exchange membranes, such as ruthenium-complex-based and crown-ether-based anion exchange membranes, are commented on for the first time. Furthermore, future development prospects are also predicted. © Editorial office of Acta Physico-Chimica Sinica.


Ouyang Z.Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

To consider the safety of a certain cross flow hydro-turbine generating units and the hydropower plant, the finite element model of the plant and units are established by ANSYS, with which the resonance check is carried out. Meantime, the spectrum analysis method is used to present an earthquake response analysis according to the relative specifications, and the earthquake reaction condition in different directions of the characteristic monitoring points in main height is obtained, then the vibration characteristics of the hydropower plant and the effect of the earthquake load are analyzed. The research gives evidence and reference to make sure of the plant structure safety and the healthy operation for hydro-turbine. © (2014) Trans Tech Publications, Switzerland.


Zhang R.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Elasto-optic constant is an important parameter for stress measurement by digital gradient sensing method (DGS). In this paper, Elasto-optic constant is measured using an edge-cracked three-point bending specimen. Elasto-optic constant is related to known stress intensity factors and specimen thickness. The full-field angular deflections around the crack-tip are measured using DGS. And then Elasto-optic constant were calculated from the experimental data by linear-least squares method. © (2014) Trans Tech Publications, Switzerland.


Duan Y.H.,Kunming University of Science and Technology | Duan Y.H.,Key Laboratory of Advance Materials in Rare and Precious and Nonferrous Metals | Sun Y.,Kunming University of Science and Technology | Peng M.J.,Kunming University of Science and Technology | Zhou S.G.,Kunming University of Science and Technology
Journal of Alloys and Compounds | Year: 2014

To better clarify and understand the anisotropic elastic properties of Ca-Pb intermetallic compounds, the structural and elastic properties of the Ca-Pb compounds (Ca3Pb, Ca2Pb, Ca5Pb 3, CaPb and CaPb3) have been investigated by using the first-principles calculations based on density functional theory. The calculated equilibrium structural parameters are in good agreement with the available experimental data. Elastic properties including bulk modulus, shear modulus, Young's modulus and Poisson's ratio, are obtained by Voigt-Reuss-Hill approximation. All Ca-Pb compounds are mechanically stable. The brittle and ductile properties are discussed by using B/G and Poisson's ratio. The elastic anisotropies of Ca-Pb compounds are investigated via the anisotropic index and the 3D figures of directional dependences of reciprocals of elastic moduli. Finally, the anisotropic sound velocities and Debye temperatures of the Ca-Pb compounds are predicted. © 2014 Elsevier B.V. All rights reserved.


Guo T.,Kunming University of Science and Technology | Zhou J.,PanLong Bureau of Housing and Urban Rural Construction | Liu X.N.,YuXi Peoples Procuratorate
Applied Mechanics and Materials | Year: 2014

The vibration intensity is strong in Francis turbine occurred under the small opening conditions, such as Lijia Gorges and Three Gorges project. In paper we use large eddy simulation (LES) method base on Vreman SubGrid-Scale model to study the generation and evolution process of turbulence flow, capturing the details of the flow structures and the dissipation of the turbulent kinetic energy. The SIMPIEC algorithm is applied to solve the coupled equation of velocity and pressure. The result shows that the small guide vane opening conditions deviate the optimal conditions most. So some unstable flow characters been induced. Such as the turbulent kinetic energy of fluid in guide vanes zone, the blade passage and the draft tube are very strong. The unstable flow phenomenon including the swirl, flow separation, interruption and vortex strip. It can be deduced that the vibration of unit is induced by these flow characteristic. © (2014) Trans Tech Publications, Switzerland.


Ren B.C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Based on the background of foundation pit excavation of a village, the process of excavation is simulated by FLAC3D.And the calculation and analysis is combined with the engineering practice. The results show that the deformation of foundation pit is mainly composed of ground surface settlement, and the maximum deformation occurred in the middle of the pit wall at the top of the part. The surface subsidence with the ongoing of the excavation, the general surface subsidence trend is rising. When it comes to the foundation pit, when the settlement velocity is very large, the foundation turns to be unstable, which need supporting methods. Flac3D program applied on the excavation of rock and soil deformation law study is feasible. The result of the study to further relevant basis are provided for the practical engineering and have certain practical application value to the rock and soil deformation in the process of excavation research. © (2014) Trans Tech Publications, Switzerland.


Yang Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Based on nonlocal elastic continuum theory, a new mathematical model and analytical solutions for nonlocal Timoshenko beam model (ANT) is established according to Hamilton's principle. Shear deformation and nonlocal effect are considered in the ANT model. The new ANT equilibrium equations and boundary conditions are derived for bending analysis of carbon nanotube (CNT). The bending behaviors of CNT with simply supported and cantilever boundary conditions are solved and discussed. The ANT deflection solutions demonstrate that the CNT stiffness is enhanced by the presence of nonlocal stress effects. Furthermore, the new ANT models concluded verifiable bending behaviors for a cantilever CNT with point load at the free end, which depends on the strength of nonlocal stress. This new conclusion reverts the current understanding according to the common nonlocal models adopted today, that the deflection in this case is indifferent to stress nonlocality and thus it surprising behaves like a macro beam with classical beam bending solution without size effect. © (2014) Trans Tech Publications, Switzerland.


Bao R.,Central South University | Yi J.,Kunming University of Science and Technology
International Journal of Refractory Metals and Hard Materials | Year: 2014

In this paper, the densification and microstructural evolution of microwave fabricated WC-8Co composites were studied. Experimental results showed that shrinkage rate increased at 1275-1325 C. The shape of most WC grains was turned into truncated trigonal prism at 1300 C for 5 min. The apparent activation energy of WC coarsening in microwave prepared alloy was 84.48 Kcal/mol, which was much lower than that in vacuum sintering. Finally, the local liquid phase sintering mechanism of microwave sintered WC-Co cemented carbide based on the hot spots formation was proposed. © 2013 Elsevier Ltd.


He X.,Kunming University of Science and Technology | Gu F.,University of Huddersfield | Ball A.,University of Huddersfield
Progress in Materials Science | Year: 2014

Friction stir welding is a relatively new solid-state joining technique which is widely adopted in different industry fields to join different metallic alloys that are hard to weld by conventional fusion welding. Friction stir welding is a highly complex process comprising several highly coupled physical phenomena. The complex geometry of some kinds of joints and their three dimensional nature make it difficult to develop an overall system of governing equations for theoretical analyzing the behavior of the friction stir welded joints. The experiments are often time consuming and costly. To overcome these problems, numerical analysis has frequently been used since the 2000s. This paper reviews the latest developments in the numerical analysis of friction stir welding processes, microstructures of friction stir welded joints and the properties of friction stir welded structures. Some important numerical issues such as materials flow modeling, meshing procedure and failure criteria are discussed. Numerical analysis of friction stir welding will allow many different welding processes to be simulated in order to understand the effects of changes in different system parameters before physical testing, which would be time-consuming or prohibitively expensive in practice. The main methods used in numerical analysis of friction stir welding are discussed and illustrated with brief case studies. In addition, several important key problems and issues remain to be addressed about the numerical analysis of friction stir welding and opportunities for further research are identified. © 2014 Elsevier B.V. All rights reserved.


Zheng Y.,Kunming University of Science and Technology | Kwoh C.K.,Nanyang Technological University
Entropy | Year: 2013

Existing algorithms for learning Boolean networks (BNs) have time complexities of at least O(N . n0.7(k+1)), where n is the number of variables, N is the number of samples and k is the number of inputs in Boolean functions. Some recent studies propose more efficient methods with O(N . n2) time complexities. However, these methods can only be used to learn monotonic BNs, and their performances are not satisfactory when the sample size is small. In this paper, we mathematically prove that OR/AND BNs, where the variables are related with logical OR/AND operations, can be found with the time complexity of O(k.(N+ logn).n2), if there are enough noiseless training samples randomly generated from a uniform distribution. We also demonstrate that our method can successfully learn most BNs, whose variables are not related with exclusive OR and Boolean equality operations, with the same order of time complexity for learning OR/AND BNs, indicating our method has good efficiency for learning general BNs other than monotonic BNs. When the datasets are noisy, our method can still successfully identify most BNs with the same efficiency. When compared with two existing methods with the same settings, our method achieves a better comprehensive performance than both of them, especially for small training sample sizes. More importantly, our method can be used to learn all BNs. However, of the two methods that are compared, one can only be used to learn monotonic BNs, and the other one has a much worse time complexity than our method. In conclusion, our results demonstrate that Boolean networks can be learned with improved time complexities. © 2013 by the authors.


Hu R.,Kunming University of Science and Technology | Xu R.,Kunming University of Science and Technology | Wang K.,Kunming University of Science and Technology | Li J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2011

Along with the rapid development and popularization of modern computer technology, Virtual tactile design software have been born, which is mainly characterized by its simple operation, quick production lines and the low cost of production, showing the powerful vitality. This article, based on the virtual touch-type design software - Freeform, adopting advanced technologies, "virtual sludge", "virtual design", and "force feedback" to design, takes Dongba sculpture as an example to analyzes the advantages, such as design process, innovative consciousness, mass production, and ways of reducing the product cost, which paves the road of prospects for this software and the sustainable development of modern sculpture in Dongba. © (2011) Trans Tech Publications.


Zhou X.-F.,Kunming University of Science and Technology | Zhou X.-F.,Tsinghua University
Bioresource Technology | Year: 2014

The aim of this study is to explore hydrothermal conversion of kraft lignin for value-added products. With ranging between 5.4% and 10.6%, total oil yield decreased with the increase of temperature (130, 180, and 230 °C), the longer reaction time (15-60 min) led to increased total oil yield. Main compound of oils characterized by GC-MS was guaiacol (2-methoxy phenol) in the range of 19-78% of oil depending on different reaction conditions. Residual kraft lignins were characterized by GPC and FTIR with respect to the conversion mechanism of kraft lignin by this process. The conversion of kraft lignin under hydrothermal conditions had something to do with the degradation of β-O-4 linkages, hydroxyl groups, carbonyl groups, aromatic rings resulting in the increased amount of phenolic OH groups in kraft lignin. © 2014 Elsevier Ltd. All rights reserved.


Chen F.-Y.,Kunming University of Science and Technology | Liu Y.-Q.,Nanyang Technological University | Tay J.-H.,Fudan University | Ning P.,Kunming University of Science and Technology
Separation and Purification Technology | Year: 2013

Alternating anoxic/oxic condition combined with step-feeding mode (AASF) has been reported to be an efficient method for nitrogen removal in granular sequencing batch reactor by our previous work. As carbon/nitrogen (C/N) ratio is one of the key factors impacting nitrogen removal efficiency, batch experiments using granules with a mean size of 1.3 mm under AASF were carried out for nitrogen removal from synthetic wastewater with C/N ratio of 5:1 and 3:1, respectively. It was found that over 90% nitrogen efficiency could be achieved for both C/N of 5 and 3. Furthermore, over 2 months operation was maintained for treating the wastewater with C/N ratio of 5:1 to investigate the long-term stability of granules under the new operational strategy. The results showed that AASF mode in GSBR could achieve over 85% nitrogen removal efficiency with great stability for long-term stability. This indicated that alternating anoxic/oxic condition combined with step-feeding mode is an effective strategy for nitrogen removal even from wastewater with low C/N ratio in granular sequencing batch reactor. © 2012 Elsevier B.V. All rights reserved.


Liao X.,Kunming University of Science and Technology | Wan Z.,Kunming University of Science and Technology | Xiong X.,Kunming University of Science and Technology
Huagong Xuebao/CIESC Journal | Year: 2013

A problem of mode mixing occurred in implementation process of local mean decomposition(LMD) method, a fault diagnosis approach for rolling bearing based on ensemble local mean decomposition(ELMD) and least squares support vector machine(LS-SVM) was proposed. Firstly, by using ELMD method, the vibrational signal of rolling bearing was decomposed a series of product function(PF) components, and then the PF components which contain main fault information were selected, and the kurtosis coefficients and energy characteristic parameters extracted from selected PF components were regarded as fault feature which was served as input parameters of LS-SVM to identify the working status and fault types of rolling bearing. The analytic results of fault-free, inner-race fault and outer-race fault of rolling bearing indicate that the working status and fault types of rolling bearing can be identified accurately and effectively by using the approach based on ELMD and LS-SVM. © All Rights Reserved.


Yonggang L.,Yunnan Agricultural University | Xueshan X.,Kunming University of Science and Technology
Molecular Biology Reports | Year: 2012

Lymphocyte-specific protein tyrosine kinase (LCK) is an important reproduction related gene. In this study, the full-length cDNA sequence of porcine LCK gene was cloned through the rapid amplification of cDNA ends (RACE) method. The porcine LCK gene encodes a protein of 509 amino acids which shares high homology with the LCK of nine species: Giant panda (97%), dog (97%), cattle (96%), sheep (95%), rabbit (95%), human (96%), rat (94%), mouse (94%) and horse (94%). This novel porcine gene was assigned to GeneID: 100233188. The phylogenetic analysis revealed that the porcine LCK gene has a closer genetic relationship with the LCK gene of dog. This gene is structured in twelve exons and eleven introns as revealed by computer-Assisted analysis. The tissue transcription profile analysis indicated that the porcine LCK gene is generally but differentially expressed in the detected tissues including large intestine, spleen, lung, muscle, fat, liver, heart, kidney and ovary. PCR-Alu I-RFLP was established to detect an A/G substitution at the position of 1127-bp of mRNA and eight pig breeds displayed obvious genotype and allele frequency differences at this mutation locus. Association of this single-nucleotide polymorphism with litter size traits was assessed in Large White (n = 100) and Landrace (n = 100) pig populations, and results demonstrated that this polymorphic locus was significantly associated with the litter size of all parities in Large White sows and Landrace sows (P<0.01). Therefore, LCK gene could be an useful candidate gene in selection for increasing litter size in pigs. These data serve as a foundation for further insight into this novel porcine gene. © Springer Science+Business Media B.V. 2011.


Yang Y.,Kunming University of Science and Technology | Yang Y.,City University of Hong Kong | Lim C.W.,City University of Hong Kong
International Journal of Mechanical Sciences | Year: 2012

New analytical solutions for free vibration of thick nanostructures are presented based on the nonlocal elastic stress field theory and the Timoshenko shear deformable nanobeam model. By applying the variational principle, new governing equations of motion and higher-order boundary conditions for these thick nanobeams are derived and their physical characteristics interpreted. The nonlinear history of straining involving higher-order strain gradients is considered in the derivation of strain energy and the contribution of higher-order strain gradients results in non-classical equations of motion thereby indicating that direct replacement of stress and moment quantities into the classical equations of motion is invalid. The Timoshenko nanobeam models are well suited for modeling and investigating the nonlocal behaviors of size-dependent carbon nanotubes. The effects of nanobeam size and various boundary conditions including simple supports, free and clamp constraints, such as a cantilevered nanotube, on the natural vibration frequency of nanotubes are discussed. The effects of nonlocal nanoscale are confirmed by comparing with molecular dynamic simulation solutions for (5,5) and (10,10) carbon nanotubes with four types of boundary conditions. The influence by nanoscale effect on the frequency ratio of nanotubes with different diameters is investigated. Further analysis based on the analytical nonlocal Timoshenko nanobeam model and the EulerBernoulli nanobeam model shows that the frequency ratio is more sensitive to nonlocal effect for free vibration of a nonlocal nanostructure if shear deformation is considered. © 2011 Elsevier Ltd. All rights reserved.


Yan N.,Yunnan University | Zhu Z.,Yunnan University | Zhang J.,Yunnan University | Zhao Z.,Kunming University of Science and Technology | Liu Q.,Yunnan University
Materials Research Bulletin | Year: 2012

TiO 2 nanoparticles doped with different content of Ce ion were prepared by sol-gel method. The samples were characterized by XRD, XPS, TEM, UV-Vis, and PL, the photocatalytic activity was evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp. The results indicate that Ce ion is incorporated into the lattice of TiO 2, which can restrain the increase of grain size, broaden the absorption region to visible light, and inhibit the recombination of the photo-generated electron and hole pairs. Moreover, the photocatalytic activity of Ce-TiO 2 in MB degradation is evidently enhanced. The MB degradation rate of the sample with Ce:Ti = 0.33% (molar ratio) in 8 h is 90.03%, which is much higher than that of P25 (68.19%). © 2012 Elsevier Ltd. All rights reserved.


Chen S.-D.,Kunming University of Science and Technology | Chen J.-C.,Kunming University of Science and Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Based on the solidification of twin-roll continuous casting thin strip, the analytical model of heterogeneous nucleation, the amended growth kinetics of dendrite tip and colunmar to equiaxed transition(CET) of dendrite during twin-roll continuous casting thin strip solidification were established by means of the principle of metal solidification and modern computer emulational technique, and based on cellular automaton, the emulational model of twin-roll continuous casting thin strip solidification was established. The basis for the emulational simulation of twin-roll casting thin strip solidification structure is provided, and the mathematical simulation feasibility is confirmed by experiments. It is found that the established mathematical model is reliable, and it can be used to predict the influence of casting parameters on solidification structure of twin-roll continuous casting thin strip.


Guo Y.,Kunming University of Science and Technology | Na J.,Kunming University of Science and Technology | Li B.,Kunming University of Science and Technology | Fung R.-F.,National Kaohsiung First University of Science and Technology
Journal of Sound and Vibration | Year: 2014

A robust feature extraction scheme for the rolling element bearing (REB) fault diagnosis is proposed by combining the envelope extraction and the independent component analysis (ICA). In the present approach, the envelope extraction is not only utilized to obtain the impulsive component corresponding to the faults from the REB, but also to reduce the dimension of vibration sources included in the sensor-picked signals. Consequently, the difficulty for applying the ICA algorithm under the conditions that the sensor number is limited and the source number is unknown can be successfully eliminated. Then, the ICA algorithm is employed to separate the envelopes according to the independence of vibration sources. Finally, the vibration features related to the REB faults can be separated from disturbances and clearly exposed by the envelope spectrum. Simulations and experimental tests are conducted to validate the proposed method. © 2014 Elsevier Ltd.


Lai C.-K.,University of Tasmania | Meffre S.,University of Tasmania | Crawford A.J.,University of Tasmania | Zaw K.,University of Tasmania | And 2 more authors.
Gondwana Research | Year: 2014

The Western Ailaoshan (WAL) Volcanic Belts mark the western boundary of the South China-Indochina Suture Zone along the Ailaoshan Fold Belt. Geochronological and geochemical evidence suggests that the WAL Volcanic Belts vary in ages and origins, and includes (1) L. Carboniferous-earliest M.-Permian (ca. 300-270. Ma) incipient backarc basin magmatism; (2) M. Permian (ca. 265. Ma) island arc/mature backarc basin magmatism; (3) early L. Permian (ca. 260-255. Ma) WAL-Indochina arc-continent collision and the associated syn-collisional granitic magmatism, as well as subsequent (4) E. Triassic (ca. 250-245. Ma) post-collisional magmatism. Regional geological comparison indicates that the post-L. Carboniferous WAL tectonic evolution was closely related to the Eastern Indochina Block. We present a new G-Plate geodynamic evolution model for the Ailaoshan Fold Belt and its surrounding South China-Indochina region, based on new and published U-Pb zircon ages, together with whole rock and Pb-isotope geochemical data. © 2013 International Association for Gondwana Research.


Sun H.,Kunming University of Science and Technology | Chen W.,Zhejiang University | Gong J.,University of Shanghai for Science and Technology
Proceedings of the 2013 6th International Conference on Biomedical Engineering and Informatics, BMEI 2013 | Year: 2013

In this paper, an improved EMD-Wavelet algorithm for PCG (Phonocardiogram) signal de-noising is proposed. Based on PCG signal processing theory, the S1/S2 components can be extracted by combining the improved EMD-Wavelet algorithm and Shannon energy envelope algorithm. By applying the wavelet transform algorithm and EMD (Empirical Mode Decomposition) for pre-procession, the PCG signal is well filtered. Based on the time frequency domain features of PCG's IMF components which is extracted from the EMD algorithm and energy envelope of the PCG, the S1/S2 components are pinpointed accurately. Experiments of thirty samples illustrate the proposed algorithm, which reveals that the accuracy for recognition of S1/S2 components is as high as 99.74%. © 2013 IEEE.


Zhao S.C.,Kunming University of Science and Technology
Science China: Physics, Mechanics and Astronomy | Year: 2012

This paper intends to realize negative refraction with absorption suppressed by the electromagnetically induced transparency (EIT) in a dense four-level atomic system. Without the two equal transition frequencies responding to the probe field, the atomic system displays a negative refraction with the simultaneously negative permittivity and negative permeability (left-handedness). The response of the probe field is amplified and propagates transparency in some frequency extents. Therefore, our aim for searching the low-loss negative refraction can be achieved in the scheme, given the main applied limitation of the negative refractive materials is the large amount of dissipation and absorption. However, an excessive signal field intensity would increase the absorption near the resonance in our scheme. © Science China Press and Springer-Verlag Berlin Heidelberg 2012.


Lai C.-K.,University of Tasmania | Meffre S.,University of Tasmania | Crawford A.J.,University of Tasmania | Zaw K.,University of Tasmania | And 3 more authors.
Gondwana Research | Year: 2014

The Central Ailaoshan (CAL) ophiolite represents an important tectonic component of the Jinshajiang-Ailaoshan-Song Ma suture zone separating the South China and Indochina blocks in the mainland SE Asia. The CAL ophiolite occurs as a complex tectonic mélange, and preserves the history of the opening and closure of the once vast Jinshajiang-Ailaoshan-Song Ma branch of the Paleotethys. New and existing geological data indicate that the CAL ophiolite contains magmatic rocks generated by: (1) L. Devonian-E. Carboniferous (ca. 380-330. Ma) volcanic passive margin-breakup development in the NW Gondwana margin; (2) L. Permian (ca. 258. Ma) Emeishan large igneous province-related continental rift magmatism, together with (and intruded by) (3) earliest M. Triassic (ca. 244. Ma) continent-continent syn-collisional S-type granitoids. The Devono-Carboniferous suites of the CAL ophiolite are highly comparable with many continental margin-type Alpine Tethyan ophiolites. In addition, the various CAL magmatic suites have strong South China block-affinities with coeval magmatism particularly in the western South China block, Jinshajiang-, Song Ma-, and Song Da terranes. © 2013 International Association for Gondwana Research.


Tang L.,Kunming University of Science and Technology
Key Engineering Materials | Year: 2012

Yunnan is very rich in natural resources, and using natural materials for building is an ancient tradition in local minority. In the remote poverty national areas, we always concern about making use of appropriate technical means, following the tradition of local construction, and efficiently applying local natural building materials. In addition, we pay close attention to improving their living quality effectively by the techniques. In this article, from a specific practice case - the United Nations GEF small grants programme, we make multiple detailed comparative analysis with traditional houses at the first, next we discuss appropriate design in the new residential construction of Aini in Xishuangbanna. And then we focus on using the local natural building materials such as bamboo, wood, adobe and other materials, by which we can make the improved design on roof system, wall system and floor system, so as to reduce construction costs and technical complexity, as well as we can effectively improve the living quality of construction at the same time. A demo project was constructed to show how these natural materials were integrated into a system to form the whole building. Joint team consists of local craftsmen and engineers constructed the demo-project so that the technology can be localized. © (2012) Trans Tech Publications.


Ju Y.-W.,University of Chinese Academy of Sciences | Wei M.-M.,University of Chinese Academy of Sciences | Wei M.-M.,Kunming University of Science and Technology | Xue C.-D.,Kunming University of Science and Technology
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2011

There are close relationships between the accumulation and occurrence of deep coal and coalbed methane (CBM) and the evolution of basin-mountain. As a case study of the coal basins in North China, the effects of the process and characteristics of basin-mountain evolution on the occurrence of the CBM were investigated. The results show that the characteristics of basin-mountain evolution have made the structure of coal-baring basin completely varing in different areas of North China, and the burial depth of coalbeds and the physical properties of coal reservoirs have also been changed to different scales. In Bohai Bay Basin, the burial depth of coalbeds has been increased due to the compression and extension detachments; the CBM move through the fracture up to the upper rock, and then conventional gas reservoirs are formed, but the CBM still trapped in the deep coal gather together. Under the extension detachment, the coal burial depth in West Shandong coal-bearing area has become deeper, while the gas volume has decreased because of the extension fault. In Huainan-Huaibei coal-bearing area, it has made the burial depth much deep with the control of the thrust nappe structure; because the magma-thermal effect in Huaibei coalfield is much more intensive than that in Huainan's, its gas content is much more in certain areas, the permeability is much better. In West Henan coal-bearing area, the burial depth of coalbeds has become deeper in the drag fold belts which were caused by the effect of sliding structure due to gravity, thus keeping the CBM well. The synclinorium is the main structure in Qinshui Basin, and this has increased the coal burial depth and the gas content become more because of the intensive magma-thermal effect, and the coalbed permeability has becomes better for the structural fracture formed later in the coalbeds. The Ordos Basin's burial depth of coalbeds depends on the sedimentary thickness, and the coal permeability becomes high because of the cleats of coalbed.


Chen G.,Kunming University of Science and Technology | Peng J.H.,Kunming University of Science and Technology | Chen J.,Kunming University of Science and Technology
Minerals and Metallurgical Processing | Year: 2011

In this paper, response surface methodology was applied to optimize the experimental conditions for the wet grinding of synthetic rutile. The effects of parameters such as rotation speed, solids concentration and duration of grinding on grinding efficiency were systematically investigated and the process conditions were optimized, using a nonlinear regression model based on central composite design. The statistical analysis of the results showed that in the range studied, the grinding efficiency of synthetic rutile was significantly affected by the rotation speed of the conical ball mill. According to results from analysis of variance, the value of the determination coefficient (R 2=0.9989) indicates that the predicted values are found to be in good agreement with experimental values. The optimized experimental conditions were as follows: a rotation speed of 350 rpm, a solids concentration of 27.31 % and a grinding time of 50.31 min, respectively. Under optimum conditions, the predicted grinding efficiency of 94.79% is obtained. The experimental values from the validation experiments were well within the predicted value of the model. Copyright 2011, Society for Mining, Metallurgy, and Exploration, Inc.


Liu S.,Kunming University of Science and Technology | Fang H.,Kunming University of Science and Technology | Dai E.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | And 3 more authors.
Electrochimica Acta | Year: 2014

A series of LiMn0.8Fe0.19Mg0.01PO 4/C composites with different carbon content are synthesized and the effect of carbon content on properties of LiMn0.8Fe 0.19Mg0.01PO4 is studied. The results show that the rate capability of LiMn0.8Fe0.19Mg 0.01PO4/C is highly dependent on carbon content, and the LiMn0.8Fe0.19Mg0.01PO4/C with 10.5 wt.% carbon exhibits the best coverage of carbon coating and the optimal rate performance. When the carbon content is reduced to 4.1 wt.%, the obtained LiMn0.8Fe0.19Mg0.01PO4/C still has an excellent rate capability and can deliver a discharge capacity of 138.5 mAh g-1 at 1 C, 121.7 mAh g-1 at 5 C and 109.6 mAh g -1 at 10 C. This is the best rate performance reported so far for low carbon coated LiMnPO4 based materials. © 2013 Elsevier Ltd. All rights reserved.


Lian P.,Kunming University of Science and Technology | Wang J.,Kunming University of Science and Technology | Cai D.,South China University of Technology | Ding L.,South China University of Technology | And 2 more authors.
Electrochimica Acta | Year: 2014

Porous nano-sized SnO2@C/graphene electrode material with three-dimensional carbon conductive network was designed and prepared. The carbon shell was introduced to suppress the aggregation of nanoparticles and undesired reactions. The excellent electronic conductivity can be guaranteed by a 3D carbon conductive network consisted of graphene sheets and carbon shell. The porous structure can facilitate liquid electrolyte diffusion into the bulk materials. As a result, the as-prepared SnO2@C/graphene nanocomposite as an anode material for lithium-ion batteries exhibits high reversible specific capacity, outstanding cyclability and good rate capability. The first reversible specific capacity is as high as 1115 mAh g-1 at a specific current of 100 mA g-1. After 100 cycles at different specific currents from 100 to 1000 mA g-1, the reversible specific capacity was still maintained at 1015 mAh g-1 at the specific current of 100 mA g-1. Even at the high specific current of 1000 mA g-1, the reversible specific capacity is still as high as 499 mAh g-1, higher than the theoretical specific capacity of the commonly used graphite anode material (372 mAh g-1). The results give the clear evidence that the electrochemical performance of graphene-based electrode materials can be improved by designing proper structure. The preparation approach of porous SnO2@C/graphene nanocomposite reported in this paper may also be applied to fabricate other porous metal oxide@C/graphene electrode materials for high performance lithium-ion batteries. © 2013 Elsevier Ltd. All rights reserved.


Xu Z.,Kunming University of Science and Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

The spheroidal weathering of sedimentary pyroclastic rocks which deposited at the bottom of Emeishan basalt is intensive. The weathering extent is stronger evidently than that of the overlying basalt. The saprolited crust have spongy microtexture and are characteristic of high porosity, high intrinsic permeability, high specific water capacity, low specific yield and low density. Both of the sedimentary volcanic clasolite have a homothetic chemical composition. Also, the changes of chemical composition in the weathering process are nearly the same. The temperature fluctuation in vadose zone can form to tiny slot between different clasts. The condensated vapor water in the tiny slot dissolve the limestone clast firstly, and then a sponginess crust occur, whose water absorbability and storativity are stronger than other saprolized crusts. The liquid water which has been absorbed and stored in the sponginess crust can both ensures the dissolution of the pyroclasts in the crust itself and supports the spread of the weathering front. The weathering process of basic calcareous sendimentary pyroclast can be divided into two stages which can not be separated absolutely. In the first stage, limestone clasts are mainly dissolved and basaltic clasts are dissolved in second stage.


Li Y.,Kunming University of Science and Technology
Dong wu xue yan jiu = Zoological research / "Dong wu xue yan jiu" bian ji wei yuan hui bian ji | Year: 2011

Hepatitis C virus is a prevalent and globally distributed human pathogen that seriously harmful to public health. However, the development of therapy and vaccine was impeded by the lack of suit small animal models. Herein, we introduce the characters of HCV replication. Taken the HCV cellular receptors as the viewpoint, the potentiality of tupaia as hepatitis C animal model is discussed at the molecular level by comparing of present animal model.


Chen L.,Kunming University of Science and Technology
Minerals Engineering | Year: 2011

The magnet has a dominant role in a high gradient magnetic separator; it provides the passage for the magnetic field and the working space where the matrix is placed to produce magnetic gradients and magnetic forces high enough to capture magnetic particles from the slurry. The effect of the magnetic field orientation of the magnet on high gradient magnetic separation (HGMS) performance has been comparatively investigated on a pilot pulsating HGMS separator with vertical and horizontal magnets respectively. The results of the investigation indicate that the magnetic field orientation has a significant effect on the performance. It was concluded that a properly designed magnet in a HGMS separator greatly improves the performance. © 2010 Elsevier Ltd. All rights reserved.


Zhang X.,Kunming University of Science and Technology | Liu H.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology | Wang C.,Kunming University of Science and Technology
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2011

Utilizing the high-temperature chemical reaction between Ti and AlN, TiN reinforced Ti3Al composite coating was in situ synthesized on TC4 alloy substrate by laser cladding technique. The phase constitution and microstructure of treated samples were examined by XRD and SEM. The results reveal that the coating is mainly composed of TiN and Ti3Al phase. When the molar ratio between Ti and AlN is 4:2, the content of TiN reduces as the laser power density increases; whereas when the molar ratio between Ti and AlN is 4:1, the content of TiN increases with increasing the laser power density. SEM observation shows that the morphology of TiN changes gradually from bar-shaped to granular with the increase of laser power density. When the molar ratio between Ti and AlN is 4:1 and the laser power density is 15.28 kW·s·cm-2, the macro-morphology of surface coating is better, no pores and cracks appear. The average microhardness of laser cladding coating is 3.4 times larger than that of TC4 alloy substrate. © Copyright.


Zhang R.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Basic principle of generalized gradient based digital image (DIC) method for subpixel-accuracy displacement measurement is discussed. The proposed method can cope well with lighting illumination variation or grayscale intensity change on the object surface during measurement by adopting a linear intensity change model, which overcomes the limitations in existing linear least squares based spatial gradient method by adopting constant model. To evaluate the proposed methods, both computer simulation and actual experiment have been carried out. The results show that the proposed method can measure displacement accurately even when substantial intensity variations exist in the experimental images. © (2014) Trans Tech Publications, Switzerland.


Zhang J.W.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Based on the design status of green building in China, this paper delivers reflections on the green building about its the meanings, evaluation criteria and design requirements from three aspects: the cost, efficiency and hygiene. It also points out the importance of the concepts of "the intelligent integration of green" and "life cycle cost" in the design of green building as well as explores the design method of green building in Chinese traditional residences from the angle of low technology and hygienic city. © (2014) Trans Tech Publications, Switzerland.


Zhang R.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Application of Digital image correlation method (DIC) to measure the elastic modulus and Poisson' ratio of rubber under compression is investigated in this paper. Surface images of the rubber surface subjected to various loading were captured using a CCD camera. DIC is subsequently used to obtain displacement field by correlating the images captured before and after deformation, and then the average compression strain is obtained by fitting the displacement using linear plane. The slope of each set of applied stress versus measured strain data is calculated by least-squares linear regression. The elastic modulus and Poisson' ratio obtained from DIC, are compared to that determined from the dial gauge, which shows that they are in good accordance with existing data. Experimental results clearly show that DIC is suitable for accurate measurement the elastic modulus of rubber. © (2014) Trans Tech Publications, Switzerland.


He X.C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Shear stress distribution behaviour of a single-lap bonded joint under tension was investigated using the three-dimensional finite element methods. Five layers of 20-node solid elements were used across the adhesive layer thickness to get accurate indication of the variation of shear stress. The stress distributions in the joint are given by the stress contours. All the numerical results obtained from the finite element analysis show that the spatial distribution of shear stress are similar for all 6 interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region is subjected to very high stress. © (2014) Trans Tech Publications, Switzerland.


Yang X.M.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

DDFS is widely used in digital signal processing and communications. Orthogonal sine wave oscillator is the main part of DDFS. In this paper, a new CORDIC algorithm implemented based on FPGA is proposed to realize DDFS. Replace the traditional look-up table ROM method to CORDIC algorithm. The algorithm has been realized in the FPGA using the pipeline architecture. The design has the advantages of little hardware resource consumption, high accuracy, and without memory. At the end, give a simulation waveform and spectrum analysis by AD converter, show the result in oscilloscope. © (2014) Trans Tech Publications, Switzerland.


Duan W.-L.,Kunming University of Science and Technology | Mei D.-C.,Yunnan University
Chinese Journal of Physics | Year: 2013

The effects of multiple time delays on an intracellular calcium oscillation (ICO) system with correlated noises were investigated by means of stochastic simulation. Suppose the pumping of Ca2+ into the calcium store takes time T1, and the release of Ca2+ from that store into the cytosol takes time T2. The simulation results indicate that: (i) There is a critical value Tc ≃ 0.1 s of T1, i.e., as T1 < Tc, increasing T1 can restrain ICO and convert the structure of the stationary probability distribution (SPD) of the intracellular Ca2+ concentrations from two peaks to one peak. However, in contrast, if T1 > Tc, increasing T1 can convert the SPD to the opposite and change the Ca2+ concentrations from desynchronous oscillation to periodically synchronous oscillation; (ii) Increasing T2 converts the SPD from two peaks to one peak and restrains ICO; (iii) As T2 increases a coherence resonance with respect to t1 occurs in the system, but it is inhibited by increasing the external noise. © 2013 the Physical Society Of The Republic Of China.


Yin Z.H.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Summarizes several types of the Riccati equation can be used in the form of elementary integral form and its general solution. The Riccati equation through the appropriate variable substitution can be variable separable equation, to calculate the general solution to use the method of elementary integrals. Some of these methods need certain skills. With a typical example this paper introduces the basic techniques of variable substitution. © (2014) Trans Tech Publications, Switzerland.


Yang Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The analytical nonlocal Euler-Bernoulli beam models for wave propagation in fluid-filled single-walled carbon nanotubes are established employing variation principle. The analytical nonlocal governing equations are derived and used in wave propagation analysis. Comparing with partial nonlocal Euler-Bernoulli beam models used previously, the novel analytical nonlocal models predict stiffness enhancement of CNT and wave decaying at high wavenumber or high nonlocal effect area. Though the novel analytical model is less sensitive than partial nonlocal model when fluid velocity is high, it simulate much high nonlocal effect than the corresponding partial model in many cases. © (2014) Trans Tech Publications, Switzerland.


Yan C.X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The radiation damage and its distribution in the type-Ib diamond film implanted by B ion have been investigated by means of Raman scattering and X-ray diffraction spectra. It is of significance during the applications of diamond materials due to several phenomena related to B-doped diamond, such as the superconductivity, the conversion of p-type to n-type conductivity and the low resistivity. The Raman scatting spectra indicated that the radiation damage in implantation layer was various with implantation depth. The top layer was damaged badly and graphitized completely. There existed small damage in nether layer, which resulted in partly amorphous carbon. It was noted that the volume was expanded in diamond film implanted by B ion. By x-ray diffraction pattern, it was reckoned that the lattice parameter was enlarged in B-implanting diamond layer, which expanded the volume of diamond film. © (2014) Trans Tech Publications, Switzerland.


Li J.H.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The cable-stayed is one of the principal force members of cable-stayed bridges. It would be prone to exhibit vibration of large amplitude on the action of wind, earthquake and traffic load,so it reduces the life of stayed cable and even cause destruction. In order to reduce the cable damage, it is very necessary to study the mechanism of vibration of cable-stayed. Experiments are conducted to explore the nonlinear vibration of cable under the periodic external force. A cable model with 14.3 meters long is set up and an acceleration sensor is installed on the midpoint of cable. Time-history acceleration data are obtained by using of acceleration sensor under three cycle load. From the data a Poincare Map is provided and chaos motion is confirmed by using of Smale Horseshoe Map theory. © (2014) Trans Tech Publications, Switzerland.


Wang H.-R.,Kunming University of Science and Technology | Ya L.,Kunming University of Science and Technology | Ying J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2011

Based on Web Service and Multi-agents technology, this paper proposes to build a remote distributed fault diagnosis system for equipments of an incineration plant which requires real-time diagnosis in a widely distributed environment. The system is modeled and implemented by multi-agent technology and is composed of a large number of agents, which are deployed at different web sites. To extend system capabilities, a user can provide additional diagnosis procedures, diagnosis services or data services. Based on diagnosis goals, relevant agents are assembled together to form a remote collaborative diagnosis system. The system can be used in any incineration plants, which greatly simplifies the deployment and maintenance efforts. © (2011) Trans Tech Publications, Switzerland.


He X.,Kunming University of Science and Technology
International Journal of Adhesion and Adhesives | Year: 2011

The need to design lightweight structures and the increased use of lightweight materials in industrial fields, have led to wide use of adhesive bonding. Recent work relating to finite element analysis of adhesively bonded joints is reviewed in this paper, in terms of static loading analysis, environmental behaviors, fatigue loading analysis and dynamic characteristics of the adhesively bonded joints. It is concluded that the finite element analysis of adhesively bonded joints will help future applications of adhesive bonding by allowing system parameters to be selected to give as large a process window as possible for successful joint manufacture. This will allow many different designs to be simulated in order to perform a selection of different designs before testing, which would currently take too long to perform or be prohibitively expensive in practice. © 2011 Elsevier Ltd. All rights reserved.


Xu W.,Kunming University of Science and Technology
Fatigue and Fracture of Engineering Materials and Structures | Year: 2011

K-dominance of static crack tip in functionally gradient materials (FGMs) with a crack oriented along the direction of the elastic gradient is studied through coherent gradient sensing (CGS), digital speckle correlation method (DSCM) and finite element method (FEM). In the direction of crack propagation, the shear modulus has a linear variation with constant mass density and Poisson's ratio. First, the CGS and DSCM governing equations related to the measurements and the elastic solutions at mode I crack in FGMs are obtained in terms of the stress intensity factor, material constants and graded index. Secondly, two kinds of FGMs specimens and one homogenous specimen are prepared to observe the influences of the property variation on the K-dominance. Then, CGS and DSCM experiments using three-point-bending of FGMs and homogenous beams are performed. Thirdly, based on the results of the experiments, the stress intensity factors of three kinds of specimens are calculated by CGS and DSCM. Meanwhile, the stress intensity factors are obtained by FEM. Finally, comparing the results from CGS, DSCM and FEM, the K-dominance of mode-I static crack tip in FGMs is discussed in detail. © 2010 Blackwell Publishing Ltd.


Yu X.,Kunming University of Science and Technology | Xu X.,Lanzhou University | Xin S.,Lanzhou University | Qiu J.,Kunming University of Science and Technology
Journal of the American Ceramic Society | Year: 2011

Red optical properties of Pr 3+-doped Ca 2SnO 4 compounds prepared by the solid-state reaction at different atmospheres were investigated. Comparing with the air-sintered phosphor, a significant enhancement of the red emission intensity was observed for the vacuum-sintered phosphor. This improvement could be attributed to the increased oxygen vacancies, which act as the sensitizers for the effective energy transfer (ET) from Ca 2SnO 4 host to Pr 3+. This study demonstrated that the ET process between the host and rare-earth ions in Ca 2SnO 4 was closely related to the oxygen vacancies. © 2011 The American Ceramic Society.


Huang G.,Kunming University of Science and Technology
Proceedings - 2010 International Conference on Web Information Systems and Mining, WISM 2010 | Year: 2010

In this paper, a fast terminal sliding mode control with fuzzy disturbance observer scheme is proposed. In the scheme, a novel adaptive law for fuzzy disturbance observer is presented, which has faster convergence than the conventional one. Combining the fast terminal mode and the novel fuzzy disturbance observer, the proposed new scheme is not only suitable for uncertainty nonlinear system, but also can achieve faster convergence. The relationship and difference between the suggested fuzzy disturbance observer and the conventional one are discussed. Finally, simulation studies for rotational inverted pendulum are provided to confirm the performance and the effectiveness of the proposed control approach. © 2010 IEEE.


Liu R.,Kunming University of Science and Technology | Li Y.,Kunming University of Science and Technology
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | Year: 2012

The scan-thinning algorithm based on the morphological characteristics of the raster lines is designed. The result of the scan-thinning algorithm has some characteristics, less influence of the edge conditions, less center-pixels. The auto-tracking-vectorization algorithm disposes the result of the scan-thinning algorithm. It reduces the working of coordinate transfer. At the same time the results of this algorithm contain less nodes, approach with the center of line, do not mutual interrupted at the intersection. It improved the efficiency of auto-vectorization and post-processing.


Li Y.,Yunnan University | Zhao K.,Yunnan University | Zhao K.,Kunming University of Science and Technology
Neurocomputing | Year: 2011

In this paper, the global robust exponential stability of equilibrium solution to delayed reaction-diffusion recurrent neural networks with Dirichlet boundary conditions on time scales is studied. Using topological degree theory, M-matrix method, Lyapunov functional and inequality skills, we establish some sufficient conditions for the existence, uniqueness and global robust exponential stability of equilibrium solution to delayed reaction-diffusion recurrent neural networks with Dirichlet boundary conditions on time scales. One example is given to illustrate the effectiveness of our results. © 2011 Elsevier B.V.


Yang X.,Kunming University of Science and Technology | Li Y.,Kunming University of Science and Technology | Xiong J.,Kunming University of Science and Technology
Qiche Gongcheng/Automotive Engineering | Year: 2011

A simplified 4 DOF single-track model for tractor-semitrailer combination is built, on which the effects of two key parameters, i. e. the positions of hitch point and the mass center of semitrailer, on the lateral stability of tractor-semitrailer combination are analyzed. Based on this, the mechanisms of two common instability phenomena i. e.'jackknifing' and 'lateral sway' are investigated in detail by using main component of eigenvector (MCE) method. Finally the stabilization effects of the feedback of hitch angle and hitch angle rate on 'jackknifing' and 'lateral sway' are analyzed and compared respectively.


Li Z.,Kunming University of Science and Technology | Zhang X.-Y.,Kunming University of Science and Technology | Wang J.-X.,Wuhan University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The block rock slope is made up of blocks and structural surfaces, and the stability of the rock mass is controlled by the existence and the strength of structural surface. Researches on the stability of block rock slope are carried out by using the lower bound theorem of plastic limit analysis, block discretization technique and mathematical programming method. Firstly, the slope is discretized into block assemblages that consist of rigid blocks and structural surface, considering the integral interaction of each other. And then, regarding the safety factor of slope stability as the objective function, the nonlinear mathematical programming models are established based on the lower bound theorem, which satisfy the equilibrium equations, yield conditions and static boundary conditions. The solution strategies of models are put forward, and the calculation programs are compiled. Finally, four classic examples are analyzed by means of the proposed method, and the rigorous lower limit values of the strength safety coefficient of slope, and the corresponding statically admissible stress fields are obtained. The results are compared with those produced by other classical approaches, and the validity of the proposed method is indicated.


Chang R.,Kunming University of Science and Technology | Wang F.,Kunming University of Science and Technology | You P.,Kunming University of Science and Technology
APWCS 2010 - 2010 Asia-Pacific Conference on Wearable Computing Systems | Year: 2010

Although multi-touch technology is currently a research focus in the field of Human-Computer Interaction, its relative research, however, is still comparatively few in China. In this paper 1 , several foreign multi-touch technologies based on senor and computer vision are introduced and the advantages and disadvantages of these technologies are analyzed briefly. It is important for studying the technology of detection and tracking touch-point in multi-touch. Furthermore the FTIR (Frustrated Total Internal Reflection) and DI (Diffused Illumination) which are based on computer vision multi-touch technology are highlighted. Finally, several crucial techniques in the field of multi-touch technology are also discussed. © 2010 IEEE.


Shen L.,Kunming University of Science and Technology | Lei J.,Kunming University of Science and Technology | Bi Y.,Kunming University of Science and Technology
Journal of Biomedicine and Biotechnology | Year: 2011

In order to investigate the effects ethanol-diesel blends and altitude on the performance and emissions of diesel engine, the comparative experiments were carried out on the bench of turbo-charged diesel engine fueled with pure diesel (as prototype) and ethanol-diesel blends (E10, E15, E20 and E30) under different atmospheric pressures (81 kPa, 90 kPa and 100 kPa). The experimental results indicate that the equivalent brake-specific fuel consumption (BSFC) of ethanol-diesel blends are better than that of diesel under different atmospheric pressures and that the equivalent BSFC gets great improvement with the rise of atmospheric pressure when the atmospheric pressure is lower than 90 kPa. At 81 kPa, both HC and CO emissions rise greatly with the increasing engine speeds and loads and addition of ethanol, while at 90 kPa and 100 kPa their effects on HC and CO emissions are slightest. The changes of atmospheric pressure and mix proportion of ethanol have no obvious effect on NO x emissions. Smoke emissions decrease obviously with the increasing percentage of ethanol in blends, especially atmospheric pressure below 90 kPa. © 2011 Jilin Lei et al.


Zhang M.,Kunming University of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2014

The wireless channel capacity and spectrum utilization can be exponentially increased through using MIMO channel without increasing bandwidth and antenna's sending power. While, the spectrum is overlapped in OFDM system because each of its individual subsidiary channels is mutually orthogonal, this will reduce mutual interference between the subcarrier and improve spectrum utilization. Thus the combination ofMIMO and DFDM can overcome the selective fading of the wireless channel frequency and increase system capacity as well as improve spectrum utilization. The MIMO-OFDM sending and receiving system without CP, however, can realize a higher data transfer rate in case of without increasing the complexity of the hardware implementation. © Springer-Verlag Berlin Heidelberg 2014.


Sun L.,Kunming University of Science and Technology | Zhuang Y.,Kunming University of Science and Technology | Bai X.,Kunming University of Science and Technology
International Journal of Food Science and Technology | Year: 2011

The effects of boiling and microwaving on nutritional compositions, antioxidant components and antioxidant activities of fresh and frozen A. blazei Murril (AbM) were evaluated and compared. The results showed that the contents of crude protein, ash, total soluble protein, total soluble sugar, vitamin C, and total phenolics decreased by both cooking treatments, but no significant changes were observed in lipids. Amino acid composition analysis showed that the ratio of total essential amino acids to total amino acids increased, and the ratio of total non-essential amino acids to total amino acids thus decreased by both cooking treatments. Boiling and microwaving significantly decreased the contents of glucose, galactose and mannose, and the effect of boiling was higher than that of microwaving. Furthermore, boiling and microwaving significantly decreased the DPPH-scavenging activity and reducing power of AbM. Analysis of the relations between the antioxidant activities and total phenolic concentrations testified that the cooking treatments not only decreased the total phenolic contents, but also changed the types and relative amounts of phenolic compounds of AbM. © 2011 The Authors. International Journal of Food Science and Technology © 2011 Institute of Food Science and Technology.


Chen F.-Y.,Kunming University of Science and Technology | Chen F.-Y.,Nanyang Technological University | Liu Y.-Q.,Nanyang Technological University | Tay J.-H.,Fudan University | Ning P.,Kunming University of Science and Technology
Journal of Hazardous Materials | Year: 2011

This study investigated the effects of different operational strategies for nitrogen removal by aerobic granules with mean granule sizes of 1.5. mm and 0.7. mm in a sequencing batch reactor (SBR). With an alternating anoxic/oxic (AO) operation mode without control of dissolve oxygen (DO), the granular sludge with different size achieved the total inorganic nitrogen (TIN) removal efficiencies of 67.8-71.5%. While under the AO condition with DO controlled at 2. mg/l at the oxic phase, the TIN removal efficiency was improved up to 75.0-80.4%. A novel operational strategy of alternating anoxic/oxic combined with the step-feeding mode was developed for nitrogen removal by aerobic granules. It was found that nitrogen removal efficiencies could be further improved to 93.0-95.9% with the novel strategy. Obviously, the alternating anoxic/oxic strategy combined with step-feeding is the optimal way for TIN removal by granular sludge, which is independent of granule size. © 2011 Elsevier B.V.


Zhao Z.,Kunming University of Science and Technology | Ma C.,Kunming University of Science and Technology | Cao Y.,Kunming University of Science and Technology | Yi J.,Kunming University of Science and Technology | And 2 more authors.
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2013

As promising light-absorber material for solar cells, Cu 2ZnSnS4 was found to have another crystal structure (wurtzite-kesterite) in addition to the conventional zinc blende-kesterite structure. Structural flexibility of Cu2ZnSnS4 opens up an avenue to develop light-absorber material with novel exciting properties and applications. However, its electronic and optical properties have not been comprehensively studied yet. For this purpose, the method of density functional theory within hybrid functional of PBE0 was adopted to study the structural, electronic, and optical properties of wurtzite-kesterite Cu 2ZnSnS4 in this Letter. The calculated results suggested that the energy of its band gap is about 1.372 eV and it has obvious optical anisotropy. Furthermore, its crystal structure leads local internal fields that are especially beneficial to suppress the recombination of photoexcited electron-hole pairs. © 2012 Elsevier B.V.


Yu J.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology
Sensors and Transducers | Year: 2014

Programmed Logic Controller (PLC) is the digital calculation operation system, which is specially designed for industrial working environment. This paper proposed the implement of hydraulic control system for large-scale railway maintenance equipment based on PLC. This implement pursued the purpose of accurate control of hydraulic working units of large-scale railway maintenance equipment. Large-scale railway maintenance equipment should always work in efficient statement. Focusing on this requirement, the reliability design of hardware for current leakage and impulse current which is proposed in the paper is necessary. This paper proposed Triple Modular Redundancy (TMR) for relative horizontal check of working units linking bridge. This paper also proposed the method to prevent the current leakage and impulse current. As for hydraulic valves, this paper proposed PID algorithm to realize the control of Analogue Closed-Loop. © 2014 IFSA Publishing, S. L.


Jiang Y.,Kunming University of Science and Technology | Kuang C.,Tongji University
Progress in Chemistry | Year: 2012

Much attention has been paid to the synthesis of 1,2,3-trizaole derivatives with the development of its wide applications in the fields of medicine, pesticide, and materials. This review describs the synthesis history of the 1,2,3-triazole derivatives and focuses on Cu-catalyzed synthesis of 1,4-disubstitued-1,2,3-triazoles, Ru-catalyzed synthesis of 1, 5-disubstitued-1, 2, 3-triazoles, and other new methods in recent 10 years. Relevant mechanisms and applications of some reactions are also described. Finally, the further work needed to do and the development trends in the field of 1,2,3-triazole derivative synthesis are proposed.


Yu R.,Kunming University of Science and Technology | Chong X.,Kunming University of Science and Technology | Jiang Y.,Kunming University of Science and Technology | Zhou R.,Kunming University of Science and Technology | And 2 more authors.
RSC Advances | Year: 2015

The phase stability, electronic structure, elastic and metallic properties of manganese nitrides (Mn4N, Mn2N0.86, Mn3N2, and MnN) were extensively studied by first principles calculations. The negative values of cohesive energy and formation enthalpy show that these compounds are thermodynamically stable. The bonding of Manganese nitrides is the combinations of covalent and metallic bonds. In addition, a strong hybridization exists nearby the Fermi level, being characteristic of N-p and Mn-d states. The elastic properties of these nitrides (Mn4N, Mn2N0.86, and MnN) were calculated, which included bulk modulus, shear modulus, Young's modulus, Poisson's ratio, and hardness. The calculated results reveal that Mn2N0.86 and MnN are ductile while Mn4N is brittle, and the hardness values of these nitrides are 24.35 GPa, 12.01 GPa, and 17.06 GPa, respectively. The MnN compound has the highest Debye temperature (632.1 K), while Mn2N0.86 has the lowest Debye temperature (390.5 K). The anisotropy of Young's modulus for Mn4N and MnN compounds is more prominent than Mn2N0.86 at the three crystalline planes. Moreover, the compound of Mn3N2 has an unstable structure in mechanical stability. This journal is © 2015 The Royal Society of Chemistry.


Zhuang Y.,Kunming University of Science and Technology | Chen L.,Kunming University of Science and Technology | Sun L.,Kunming University of Science and Technology | Cao J.,Kunming University of Science and Technology
Journal of Functional Foods | Year: 2012

The contents of bioactive compounds (Vitamin C (Vc), carotenoids, total phenolics, phenolic profiles and capsaicinoids) and antioxidant activities (reducing power, DPPH. -scavenging activity and lipid peroxidation inhibition ability) of nine peppers from Yunnan province China, belonging to seven cultivars, were determined. Red and green Point pepper/Long-point pepper were from the same cultivars at different maturity stages. Results showed that all fresh pepper samples were rich in Vc, carotenoids, and total phenolics. Vc contents varied mainly depending on the pepper cultivars, except for the ripened stages. The phenolic content in red Fructus Capsici (Capsium frutescens L.) was significantly higher than that of others (Capsium annuum L.) (p<0.05). Seven phenolics were identified in four pepper samples, while six phenolics were detected in other samples. The capsaicinoid contents of nine peppers showed a large variability, and the content in red Fructus Capsici was significantly higher than that of others (p<0.05). The extracts of nine peppers showed high reducing power, DPPH. -scavenging activity, and lipid peroxidation inhibition ability, and the activities of Fructus Capsici were significantly stronger than those of others (p<0.05). Furthermore, antioxidant activities of nine peppers correlated well with their total phenolic contents. © 2012 Elsevier Ltd.


Hong W.,Kunming University of Science and Technology
Wei sheng wu xue bao = Acta microbiologica Sinica | Year: 2010

OBJECTIVE: Genus Thermus represents an ancient descendant within the domain of Bacteria. This research was focused on the isolation and characterization of Thermus bacteriophages from Tengchong Reihai hot spring. METHODS: Bacteriophage was isolated from Tengchong Rehai hot springs by double-layer plate method, and further characterized by morphology, temperature, pH and organic solvent effect on phage production, DNA restriction endonuclease digestion and protein composition analysis. RESULTS: One lytic bacteriophage was isolated from Tengchong hot spring. It's host strain Thermus sp. TC10 belonged to genus Thermus (16S rRNA gene accession number GU119889). This phage has a hexagonal head (67 nm in diameter) and an extremely long tail (837 nm in length and 10 nm in width). The optimum temperature and pH value for production of virons were about 65 degrees C and 7.6, respectively. The phage was not sensitive to chloroform. The differences between this phage and the other two Thermus Siphoviridae phages P23-45 and P74-26, which were isolated form Russia's Kamchatka peninsula, demostrated it was a novel bacteriaphage and was denoted as TTSP10 (Tengchong Thermus Siphoviridae phage).


Yu G.,Kunming University of Science and Technology | Yang J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2011

Chaos and support vector machine theory has opened up a new route to study complicated and changeable non-linear hydrology time series. Applying the Chaos and non-linear time series based on the support vector machine regression principle, this paper proposes a method and its characteristic and the choosing of key parameters to forecast and set up models. According to Phase Space Reconstruction theory carry on reconstruction of Phase Space to monthly surface flow course, have discussed that probed into the non-linear prediction model of time series of Chaos of the support vector machine, application in the monthly surface flow, have introduce it through to the nuclear function of the base in the course of setting up the model of support vector machine, has simplified the course of solving the non-linear problems. The instance indicates that the model can deal with the complicated hydrology data array well, and there is the good prediction precision. © (2011) Trans Tech Publications, Switzerland.


Wu K.,Nanyang Technological University | Zhao N.,Kunming University of Science and Technology
IIE Transactions (Institute of Industrial Engineers) | Year: 2015

Tandem queues with a finite buffer capacity are the common structures embedded in practical production systems. We study the properties of tandem queues with a finite buffer capacity and non-overlapping service times subject to time-based preemptive breakdowns. Different from prior aggregation and decomposition approaches, we view a tandem queue as an integrated system and develop an innovative approach to analyze the performance of a dual tandem queue through the insight from Friedman's reduction method. We show that the system capacity of a dual tandem queue with a finite buffer and breakdowns can be less than its bottleneck-sees-initial-arrivals system due to the existence of virtual interruptions. Furthermore, the virtual interruptions depend on job arrival rates in general. Approximate models are derived using priority queues and the concept of virtual interruptions. 2015 Copyright © “IIE”


Li S.,Yunnan University of Finance and Economics | Di Y.,Yunnan University of Finance and Economics | Di Y.,Kunming University of Science and Technology | Liang X.,Shanghai Zhuzong Company
International Journal of Polymeric Materials and Polymeric Biomaterials | Year: 2013

The tribological behavior of PA66, PA66/Montmorillonite nanocomposites, and PA66/(SEBS-g-MA + Montmorillonite) nanocomposites was studied by means of a ring-on-block tribometer. The morphologies of the worn surfaces of specimens were observed with scanning electron microscopy (SEM). Wear of all of the specimens increases with increasing load; meanwhile, the friction coefficient decreases. Wear of PA66/Montmorillonite is larger than that of PA66. Adding SEBS-g-MA to PA66/Montmorillonite improves the wear resistance. The friction coefficient of PA66/Montmorillonite is slightly less than that of PA66 at various loads. The friction coefficient of PA66/(SEBS-g-MA + Montmorillonite) is the lowest. © 2013 Copyright Taylor and Francis Group, LLC.


Xu Y.-Y.,Kunming University of Science and Technology
Communications in Theoretical Physics | Year: 2013

The interference has been measured by the visibility in two-level systems, which, however, does not work for multi-level systems. We generalize a measure of the interference based on decoherence process, consistent with the visibility in qubit systems. By taking cluster states as examples, we show in the one-way quantum computation that the gate fidelity is proportional to the interference of the measured qubit and is inversely proportional to the interference of all register qubits. We also find that the interference increases with the number of the computing steps. So we conjecture that the interference may be the source of the speedup of the one-way quantum computation. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Wu J.,Kunming University of Science and Technology | Zhou H.-X.,Beijing University of Chemical Technology | Liu Q.,Beijing University of Chemical Technology | Yan S.-K.,Beijing University of Chemical Technology
Chinese Journal of Polymer Science (English Edition) | Year: 2013

The dependence of properties on the structure and morphology of semicrystalline polymers offers an effective way to tailor the properties of these materials through structure control. To this end, establishing the structure and property relationship is of great importance. For a right characterization of the crystal structure, several techniques can be used. Among these techniques, electron diffraction has its advantage for determining the crystal structure related to specific formation condition since it can combine with bright and dark fields observation of the sample. This feature article describes the application of electron diffraction in determining the crystal structure of semicrystalline polymers with elaborately selected examples. We focus on how the electron diffraction can be used to disclose the crystal structure, mutual orientation of different crystals, as well as the disorders included in the polymer crystals. © 2013 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.


Xu Y.-Y.,Kunming University of Science and Technology
Communications in Theoretical Physics | Year: 2013

We investigate the interference of a kicked harmonic oscillator in phase space. With the measure of interference defined in Lee and Jeong [Phys. Rev. Lett. 106 (2011) 220401], we show that interference increases more rapidly in the chaotic regime than in the regular regime, and that the sub-Planck structure is of importance for the decoherence time in the chaotic regime. We also find that interference plays an important role in energy transport between the kicking fields and the kicked harmonic oscillator. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Xu L.,Kunming University of Science and Technology | Tang W.,Kunming University of Science and Technology
Pathology and Oncology Research | Year: 2016

MicroRNAs (miRNAs) are non-coding RNAs which act as tumor suppressors or oncogenes. And single nucleotide polymorphism (SNP) in miRNA regions is one type of genetic variations in human genome. Various studies have investigated the associations of miRNAs SNP and kinds of cancers. In this article, we searched eligible studies to explore the relationships between mir-196a2 /mir-146a /mir-149 polymorphisms and colorectal cancer (CRC). A literature search of PubMed, Web of Science and ScienceDirect was conducted to identify all relevant studies. Three genetic models with pooled ratio and 95 % confidence interval were used to evaluate the associations. We found that mir-196a2 polymorphism was significantly associated with CRC in Asian group (additive model: OR = 1.197, 95 %CI 1.084 ~ 1.32, P < 0.001; dominant model: OR = 1.247, 95 %CI 1.065 ~ 1.46, P = 0.006; recessive model: OR = 1.298, 95 %CI 1.101 ~ 1.531, P = 0.002). And no associations were observed between SNPs of mir-146a, mir-149 and CRC in three genetic models. We also found CRC risk was not associated with mir-146a and mir-149 polymorphisms in population subgroup analysis. The current meta-analysis suggests that mir-196a2 polymorphism is associated with CRC, especially in Asian group. While, no associations have been found between mir-146a /mir-149 polymorphisms and CRC. © 2014, Arányi Lajos Foundation.


Zhuang Y.,Kunming University of Science and Technology | Zhang Y.,Kunming University of Science and Technology | Sun L.,Kunming University of Science and Technology
International Journal of Food Science and Technology | Year: 2012

The contents of total dietary fibre (TDF), soluble dietary fibre (SDF), insoluble dietary fibre (IDF) and functional properties of fibre-rich powders (FRP) from pitaya peels with different particle size (FRP80, FRP140 and FRP250) were determined. Results showed that FRP140 had higher TDF (79.37%) and SDF (33.07%) with a balanced ratio of SDF/IDF (1:1.32) and higher water-holding capacity (54.20gg -1), swelling capacity (50.63mLg -1), oil-holding capacity (2.65gg -1) and glucose dialysis retardation index (62.83% at 60min), compared with FRP80 and FRP250. Therefore, physiochemical properties of FRP140 were further investigated. SDF of FRP140 mainly contained rhamnose (4.95%) and galactose (1.98%), with 9.45% galacturonic acid, while IDF dominantly contained xylose (4.76%) and galactose (3.42%), with 18.54% klason lignin. Total phenolic content was 7.75mgg -1 and mainly composed of salicylic acid (0.98mgg -1) and protocatechuic acid (0.45mgg -1). Furthermore, FRP140 showed significant reducing power, DPPH-scavenging activity and nitrite-scavenging ability. © 2012 The Authors. International Journal of Food Science and Technology © 2012 Institute of Food Science and Technology.


Chen G.,Kunming University of Science and Technology | Di L.,Kunming University of Science and Technology | Zhang Q.,Chang'an University | Zheng Z.,Tianjin University | Zhang W.,Kunming University of Science and Technology
Energy | Year: 2015

The effects of DMF (2,5-dimethylfuran) fuel properties combined with EGR (exhaust gas recirculation), CA50, EHN (2-Ethylhexyl nitrate) and multi-injection strategies on combustion and emission characteristics were experimentally investigated in two common-rail diesel engines including a single-cylinder engine and a multi-cylinder engine. Results demonstrate that, with DMF addition into diesel, ID (ignition delay) prolongs and smoke decreases more greatly as EGR rate increases. When DMF addition fraction increases up to 40%, the inherent trade-off between NOx and smoke can be eliminated, but the MPRR (maximum pressure rise rate) is too high. However, the higher MPRR can be reduced efficiently without serious penalties in smoke and BTE (brake thermal efficiency) by delaying CA50 and adding EHN reasonably. Although DMF and gasoline have very similar physic-chemical properties, DMF/diesel blends are much more efficient than gasoline/diesel wide-distillation blends to reduce soot with high EGR rates due to its much longer ID and atomic oxygen. With increasing DMF addition fraction, BTE is affected less by the delay of CA50, meanwhile, multi-injection strategies have less impact on soot generation. Additionally, as compared to the delay of CA50 and the addition of EHN, the employ of pilot injection is poor to reduced MPRR for DMF/diesel blends. © 2015 Elsevier Ltd.


Lv Z.,Kunming University of Science and Technology
2015 IEEE International Conference on Cyber Technology in Automation, Control and Intelligent Systems, IEEE-CYBER 2015 | Year: 2015

Developing with the growing information society, people want to communicate with the computer by natural language and chat robot is such an interactive system to communicate with human beings. The key is to understand that chat robot technology means the speaker's statement which the basic structure is the word, so the word is a critical foundation in Chinese information processing. The methods through word-based statistical learning are currently the mainstream in Chinese word practice, due to the limitation of its training corpus, resulting in poor adaptive capabilities. This paper proposes an adaptive Chinese words' method which is a hybrid model combining rules and language It is showed that the adaptive ability of this hybrid approach has been improved significantly, the segmentation accuracy rate above 97%, reducing the error rate of word segmentation caused by ambiguity effectively. © 2015 IEEE.


Fan J.,Kunming University of Science and Technology | Zhuang Y.,Kunming University of Science and Technology | Li B.,Ocean University of China
Nutrients | Year: 2012

Jellyfish collagen (JC) was extracted from jellyfish umbrella and hydrolyzed to prepare jellyfish collagen hydrolysate (JCH). The effects of JC and JCH on UV-induced skin damage of mice were evaluated by the skin moisture, microscopic analyses of skin and immunity indexes. The skin moisture analyses showed that moisture retention ability of UV-induced mice skin was increased by JC and JCH. Further histological analysis showed that JC and JCH could repair the endogenous collagen and elastin protein fibers, and could maintain the natural ratio of type I to type III collagen. The immunity indexes showed that JC and JCH play a role in enhancing immunity of photoaging mice in vivo. JCH showed much higher protective ability than JC. These results suggest that JCH as a potential novel antiphotoaging agent from natural resources. © 2013 by the authors; licensee MDPI, Basel, Switzerland.


Yu J.,Kunming University of Science and Technology | Yang J.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology
Sensors and Transducers | Year: 2014

 Focusing on the fault detection application for large-scale railway maintenance equipment with the specialties of low-cost, energy efficiency, collecting data of the function units. This paper proposed energy efficiency, convenient installation fault detection application using Sigsbee wireless sensor networks, which Sigsbee is the most widely used protocol based on IEEE 802.15.4. This paper proposed a systematic application from hardware design using STM32F103 chips as processer, to software system. Fault detection application is the basic part of the fault diagnose system, wireless sensor nodes of the fault detection application with different kinds of sensors for verities function units communication by Sigsbee to collecting and sending basic working status data to the home gateway, then data will be sent to the fault diagnose system. © 2014 IFSA Publishing, S. L.


Zhang Q.B.,Kunming University of Science and Technology | Hua Y.X.,Kunming University of Science and Technology
Physical Chemistry Chemical Physics | Year: 2014

The electrochemical nucleation and growth kinetics of copper nanoparticles on a Ni electrode have been studied with cyclic voltammetry and chronoamperometry in the choline chloride (ChCl)-urea based deep eutectic solvent (DES). The copper source was introduced into the solvent by the dissolution of Cu(i) oxide (Cu2O). Cyclic voltammetry indicates that the electroreduction of Cu(i) species in the DES is a diffusion-controlled quasi-reversible process. The analysis of the chronoamperometric transient behavior during electrodeposition suggests that the deposition of copper on the Ni electrode at low temperatures follows a progressive nucleation and three-dimensional growth controlled by diffusion. The effect of temperature on the diffusion coefficient of Cu(i) species that is present in the solvent and electron transfer rate constant obeys the Arrhenius law, according to which the activation energies are estimated to be 49.20 and 21.72 kJ mol-1, respectively. The initial stage of morphological study demonstrates that both electrode potential and temperature play important roles in controlling the nucleation and growth kinetics of the nanocrystals during the electrodeposition process. Electrode potential is observed to affect mainly the nucleation process, whereas temperature makes a major contribution to the growth process. © the Owner Societies 2014.


Huang J.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

With the coming of aging society, a lot of old people choose to spend their old age in nursing home. Some old men are dementia, disability or long-term illness, this is a new challenge to nursing home management. This paper presents an intelligent management system solution of nursing home based on Internet of things; nursing staff can monitor the old man's whereabouts in 24 hours, to protect the safety of the old man. For the sick old man, use a variety of sensors for real-time vital signs data acquisition to realize medical monitoring, and transfer data to central hospital for diagnosis and monitoring by doctors. © (2013) Trans Tech Publications, Switzerland.


Jiaqun X.,Kunming University of Science and Technology | Huping L.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

This paper presents a theoretical and experimental analysis of a pulse combustion in reheating furnace. Measurements of the composition content on flue gases and heat balance tests were carried out for operating parameters in reheating furnace. Experimental results show an intensive and efficient heating process. An attempt was made to perform theoretical computation of composition content in the reheating furnace. Satisfactory agreement between calculations and experimental results was found in certain regions. Discrepancies might be caused by sample of the combustion products which were assumed to be uniform distribution out of the reheating furnace. The results show that the pulse combustion has comparatively large influence upon both combustion and heat efficiency in a reheating furnace. © (2013) Trans Tech Publications, Switzerland.


Liu T.,Yunnan Nationalities University | Guo Y.,Yunnan Nationalities University | Ning P.,Kunming University of Science and Technology | Yuan M.,Yunnan Nationalities University
Applied Mechanics and Materials | Year: 2013

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over a series of solid acids using a fixed-bed reactor. Solid acid MoO3/ZrO2 displayed the highest activity, over which the conversion of CCl2F2 reached 100 % at 250 °C. CO2 was the main-product and the selectivity to CClF3 remained lower than 28.0 %. CO was not detected as by-product. The decomposition activity depended on the calcination temperature and the ZrO2 content. The activity of solid acid MoO3/ZrO2 correlates well with its specific surface area and the amount of medium-strong acid sites on the surface. To explain the reaction mechanism for CCl2F2 catalytic decomposition over MoO3/ZrO2, a surface intermediate, Osurface-CF2-Osurface is proposed. © (2013) Trans Tech Publications, Switzerland.


Xu T.,Yunnan University | Pan X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

Daqing River is one of the major rivers flowing into the Dianchi Lake. In this paper, phytoplankton investigation and environmental assessment for the dredged area in Daqing Estuary Section of Dianchi lake in Kunming city was reported. After microscopic identification and counting of 6 water samples(two of them is control plot), the water environment were evaluated by the phytoplankton species and quantity which were assessed by the biological diversity index, including Maglarf, Shanon-Wiener, Simpson diversity index, Pielou index and Berger-Parker dominance index. It's found that there are mainly 5 species of algae, and among them, Microcystis spp. et al., are the dominant species. So the water is assessed as eutrophication, Heavy sewage. Based on the diversity index analysis, the dredged area sampling sites were relatively higher than the non-dredged areas in biodiversity of phytoplankton. Summarily, the water quality after dredging has been improved to some extent. Phytoplankton biodiversity indicators should be the important water environmental assessment method. © (2013) Trans Tech Publications, Switzerland.


Dai J.-Q.,Kunming University of Science and Technology | Zhang H.,Kunming University of Science and Technology | Song Y.-M.,Kunming University of Science and Technology
Journal of Magnetism and Magnetic Materials | Year: 2012

Using first-principles density functional theory, we investigate the interfacial electronic structure and magnetoelectric effect in M/BaTiO 3 (M=Ni, Fe) superlattices, and find a novel type of interfacial magnetoelectric coupling mechanism in the Ni/BaTiO 3 interface. This magnetoelectric effect is determined by the change of magnetic moments on Ni atoms near the interface, instead of the induced moments on interfacial Ti atoms in Fe/BaTiO 3 system, which is also distinguished from the spin-polarized carriers screening mechanism. The underlying physics is the strong interface bonding and the pdσ-type magnetic interactions between Ni 3d and O 2p spins. Furthermore, there exists an extraordinary intralayer oscillation of magnetic moments within the Ni layers, which may be observed in experiments. © 2012 Elsevier B.V.


Zhang P.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

Shear wall systems are the most commonly used lateral-load resisting systems in high-rise buildings. The building of nonlinear dynamic analysis model is the basis for calculating earthquake response. The work further investigates several nonlinear dynamic analysis models at home and abroad for RC shear wall. Classified and brief comments about the existing drawbacks of these models are conducted. Hysteretic rules, relative parameters and the applicability of these models are also discussed in detail. Lastly, some useful suggestions are proposed for the further research. © (2013) Trans Tech Publications, Switzerland.


Wan F.,Kunming University of Science and Technology | Zheng W.,Harbin Institute of Technology
Applied Mechanics and Materials | Year: 2013

In view of the issue that Heat Conductivity Coefficient (HCC) value of Thick-typed Fireproofing Coating (TFC) for tunnel at elevated temperature is not unknown, which makes researchers unable to make right fireproofing design and analysis for structure, starting from composition of TFC for tunnel, regarding it as complex of insulation aggregate and adhesive material, and using series model and parallel model, formulas of HCC at elevated temperature are established. The temperature field in three specimens is calculated by above HCC value, and is compared with testing results. Analysis result shows that HCC value from series model is the most reasonable. This paper provides an effective Solution for HCC value of TFC for tunnel at elevated temperature. © (2013) Trans Tech Publications, Switzerland.


Zhao Z.-Y.,Kunming University of Science and Technology | Yang P.-Z.,Yunnan Normal University
Physical Chemistry Chemical Physics | Year: 2014

Using density functional theory calculations, the mechanism of insulator-to-metal transition of S-doped Si has been systematically investigated. The calculated crystal structure indicates that the gentle lattice distortion is caused by sulfur doping, and this doping effect is gradually weakened with the increase of sulfur concentration. Two distinct impurity energy levels in the band gap are induced by sulfur doping, and their position and width are linearly varying along with the increase of sulfur concentration. Owing to the overlap and dispersion of these impurity energy levels, the insulator-to-metal transition occurs at the sulfur concentration of 2.095 × 1020 cm-3, which is consistent with the experimental measurement. Moreover, the defect states related with sulfur doping show delocalization features and are more outstanding at the higher sulfur concentration. The calculated results suggest that S-hyperdoped Si is a suitable candidate for intermediate band solar cells. This journal is © the Partner Organisations 2014.


Zhang Q.,Kunming University of Science and Technology | Hua Y.,Kunming University of Science and Technology
Materials Chemistry and Physics | Year: 2012

The effects of some common impurities such as copper, iron, nickel, cobalt, lead and their interaction with an ionic liquid additive 1-butyl-3- methylimidazolium hydrogen sulfate-[BMIM]HSO 4 on zinc electrodeposition from acidic sulfate electrolyte were characterized in terms of the polarization behavior and the kinetics of zinc deposition using cyclic voltammetry and potentiodynamic polarization measurements. The results showed that these metallic impurities studied exerted some different changes in cyclic and cathodic polarization voltammograms. The addition of [BMIM]HSO 4 was observed to counteract the detrimental effects of these impurities and induced a blocking effect on the zinc electrodeposition process through its cathodic adsorption on the electrode surface. The adsorption of this additive shifted the electroreduction potential of zinc ions towards more negative values, restricted impurities ions from being electroreduced, and inhibited hydrogen evolution. Moreover, the kinetics analysis of cathodic polarization suggested that the presence of these impurities alone and in combination with [BMIM]HSO 4 had no effect on the Tafel slope and transfer coefficient but affected the exchange current density for the zinc deposition. © 2012 Elsevier B.V. All rights reserved.


Fang H.,Kunming University of Science and Technology | Yi H.,Kunming University of Science and Technology | Hu C.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | And 3 more authors.
Electrochimica Acta | Year: 2012

In this work, effect of Zn doping on the performance of LiMnPO 4 is revisited. Samples of pure and Zn-doped LiMnPO 4 are synthesized by a new solid-state method, and their structure, morphology and electrochemical behavior are characterized and compared. The results reveal that a small amount of Zn doping (2 at.%) is highly beneficial for the performance of LiMnPO 4 due to the reduced charge transfer resistance, the increased lithium ion diffusion and phase conversion, but this effect is remarkably traded off at a high level of Zn doping (10at.%). Compared with LiMnPO 4, LiMn 0.98Zn 0.02PO 4 has a much higher capacity and a much better rate capability. After 2 at.% Zn doping, the discharge capacity increases from 101 to 139 mAhg -1 at 0.1 C and 56 to 105 mAhg -1 at 2 C. © 2012 Elsevier Ltd. All rights reserved.