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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.


He X.C.,Kunming University of Science and Technology
Materials Science Forum | Year: 2011

Self-pierce riveting (SPR) technology offers an alternative to resistance spot welding (RSW) for joining sheet materials. It has been found that the SPR technology produced a much stronger joint than the RSW in fatigue test. For efficient design of SPR structures, the knowledge of dynamic characteristics of the SPR beams is essential. In this paper, the free transverse vibration characteristics of single lap-jointed cantilevered SPR beams are investigated in detail. The focus of the analysis is to reveal the influence on the natural frequency and natural frequency ratio of these beams caused by variations in the material properties of sheet materials to be jointed. It is shown that the transverse natural frequencies of single lap jointed cantilevered SPR beams increase significantly as the Young's modulus of the sheet materials increases, but change slightly corresponding to the change in Poisson's ratio. It is also found that the material density of the sheets have significant effects on the free transverse vibration characteristics of the beams. © (2011) Trans Tech Publications.


Zhen B.,Beijing Institute of Technology | Li H.,Beijing Institute of Technology | Jiao Q.,Beijing Institute of Technology | Li Y.,Kunming University of Science and Technology | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

Heteropoly acid (SiW 12O 40)-based ionic liquid (SWIL) and silica supported SiW 12O 40-based ionic liquid (SWIL/SiO 2) catalysts with different contents of SWIL were designed and prepared. The structures of the catalysts were experimentally characterized and theoretically analyzed, and catalytic activities and reusability of the catalysts were evaluated through an esterification reaction between oleic acid and methanol. The results showed that SWIL had excellent activity and good reusability. SWIL dissolved in the reaction mixture during the reaction process and could be precipitated and separated from products at room temperature after methanol and water were removed. The fresh SWIL/SiO 2 had high catalytic activity close to that of SWIL and could be easily separated from the reaction system just through simple filtration. However, the leaching of SWIL in the esterification reaction caused the deactivation of SWIL/SiO 2. SWIL contents of SWIL/SiO 2 played an important role on the catalytic activity and reusability of SWIL/SiO 2. © 2012 American Chemical Society.


Li G.,Pennsylvania State University | Na J.,Kunming University of Science and Technology | Stoten D.P.,University of Bristol | Ren X.,Beijing Institute of Technology
IEEE Transactions on Control Systems Technology | Year: 2014

The potential applications of dynamically substructured systems (DSSs) with both numerical and physical substructures can be found in diverse dynamics testing fields. In this paper, an adaptive feedforward controller based on a neural network (NN) is proposed to improve the DSS testing performance. To facilitate the NN compensation design, a modified DSS framework is developed so that the DSS control can be considered as a regulation problem with disturbance rejection. Then an adaptive NN feedforward compensation technique is proposed to cope with uncertainties and nonlinearities in the DSS physical substructure. The proposed NN technique generalizes the existing results in the literature, and it does not require any information of the plant model and disturbance model, which significantly simplifies its application on DSS. In particular, we propose a novel adaptive law for the NN online learning, where appropriate NN weight error information is derived and used to achieve improved performance. Real-time experimental results on a mechanical test rig demonstrate the improved performance by using the NN compensation strategy and the new adaptation law. © 2013 IEEE.


Na J.,Kunming University of Science and Technology | Mahyuddin M.N.,University of Bristol | Herrmann G.,University of Bristol | Ren X.,Beijing Institute of Technology
Chinese Control Conference, CCC | Year: 2013

This paper studies a novel adaptive parameter estimation framework for linearly parameterized nonlinear systems. Appropriate parameter error information is derived by defining auxiliary filtered variables and used to drive the parameter adaptation, which guarantees exponential error convergence. The proposed method is further improved via a sliding mode approach to achieve finite-time (FT) error convergence. The case with bounded disturbances or noises is also studied. The parameter estimation is obtained without using the state derivatives and is independent of observer/predictor design. The online computation of the regressor matrix inverse can be avoided. Simulation examples are included to illustrate the effectiveness. © 2013 TCCT, CAA.


Tao D.-P.,Kunming University of Science and Technology
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2012

For the CaO-Al 2O 3-SiO 2, CaO-FeO-SiO 2, and MnO-FeO-SiO 2 ternary silicate melts, there are few models that can accurately predict their component activities. One model that can make a good correlation between the ternary activities and their sub-binary ones is a pseudo-multicomponent approach based on the molecular interaction volume model (MIVM). It does not need any linear or power series composition functions of binary parameters and also does not require any ternary adjustable parameters in addition to its composition equation. The results show that in the CaO-Al 2O 3-SiO 2 system, the predicted values of SiO 2 activity are in good agreement with the experimental data at 1873 K (1600 °C), and those of CaO and Al 2O 3 are in reasonable agreement with the graphical integration of data using the Gibbs-Duhem equation at 1873 K (1600 °C) and experimental data at 1823 K (1550 °C). In the CaO-FeO-SiO 2 and MnO-FeO-SiO 2 systems, the predicted values of FeO and MnO activity are in good agreement with the experimental data, and those of CaO and SiO 2 are in reasonable agreement with the experimental data at 1823 K, 1873 K, and 1803 K (1550 °C, 1600 °C, and 1533 °C). © 2012 The Minerals, Metals & Materials Society and ASM International.


Yang T.,China Earthquake Administration | Liu Q.,Wuhan University | Li H.,Kunming University of Science and Technology | Zeng Q.,Wuhan University | Chan L.,University of Hong Kong
Atmospheric Environment | Year: 2010

Magnetic properties of road dusts in the East Lake area in Wuhan, China, were measured and compared with the results of heavy metal analyses in order to delineate the sources of pollutants. A total of ninety-seven dust samples were collected spatially from four segments with different traffic density and field settings from the roads encircling the lake. Thermomagnetic and hysteresis measurements revealed that the dominant magnetic carrier is coarse-grained magnetite. Correlations between magnetic parameters and element concentrations with traffic density and distances to the industrial region revealed that elements Cu, Ni and Fe mainly originate from vehicle traffic, which is also the major source of coarser magnetic particles (e.g., pseudo-single-domain/multi-domain (PSD/MD) grains), while element Pb and the smaller grains such as single-domain (SD) magnetic particles mainly originate from industrial emissions. The ratio between anhysteretic remanent magnetization and low-field magnetic susceptibility (ARM/χlf) can be employed as an indirect indicator for Cu, Fe and Ni emissions resulting from vehicle traffic. Due to the intermixture of elements from different sources, the element concentrations are not conclusive about the pollution source. A linear correlation between magnetic concentration-related parameters (e.g., ARM and saturation isothermal remanent magnetization, SIRM) and the concentrations of major elements (e.g., Cu, Co, Fe, Mn, Ni and V) suggests that they can be used as a proxy for heavy metal pollution. Road dusts in four segments show different magnetic characteristics, indicating various influxes of anthropogenic magnetic materials from vehicle traffic and industrial plants due to the different traffic loads and field settings. These results suggest that magnetic measurements can serve as an efficient complementary tool for the routinely employed geochemical methods to map the heavy metal pollution and trace the sources of pollutants in the road dust. © 2009 Elsevier Ltd. All rights reserved.


Du Q.Z.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

Support vector machines (SVMs) are a promising type of learning machine based on structural risk minimization and statistical learning theory, which can be divided into two categories: support vector classification (SVC) machines and support vector regression machines (SVR). The basic elements and algorithms of SVC machines are discussed. As modeling and prediction methods are introduced into the experiment of microwave calcining AUC, the better prediction accuracy and the better fitting results are compare with back propagation (BP) neural network method. This is conducted to elucidate the good generalization performance of SVMs, especially good for dealing with the data of some nonlinearity. © (2013) Trans Tech Publications, Switzerland.


He X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

This paper deals with the stress discontinuities in normal stress distribution of adhesively bonded beams. The 3-D finite element analysis (FEA) software was used to model the beams and predict the normal stress distribution along the whole beam. The FEA results indicated that there are stress discontinuities existing in the normal stress distribution within adhesive layer and adherends at the lower interface and the upper interface of the boded section. The numerical values of the normal stress concentration at key locations of the beams and the stress concentration ratio are discussed. © (2013) Trans Tech Publications, Switzerland.


He X.C.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

Friction stir welding (FSW) is a relatively new solid-state fastening method which is suitable for joining advanced lightweight metal sheets that are hard to weld. Latest literature relating to finite element analysis (FEA) of FSW process is reviewed in this paper. The recent development in FEA of FSW process is described with particular reference to three major factors that influence the performance of FSW joints: modeling technique, tool design and process parameters. The main FE methods used in FSW process are discussed and illustrated with brief case studies from the literature. © (2013) Trans Tech Publications, Switzerland.


Xia Y.,Kunming University of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2013

With the rapid development of economy and export-oriented economical pattern adopted in Yunnan province, the express industry grinds to a halt after a fast-growing stage in the past one decade. This paper tries to find approaches to this general issue through identifying critical attributions from analyzing the current situations. The author of this paper indicates that this plight stems from the inferior capability to make profits in private enterprises and then study how world four express giants do acquire higher profits from targets customers and endure the fiercer competition for sustainable earnings based on supply chain management (SCM). Lastly, suggestions for private express enterprises in Yunnan are proposed in terms of how to position themselves in conformity with the local market and how to improve their service for customers' satisfaction by taking the change of real idea about market as the first priority. © 2013 Springer-Verlag Berlin Heidelberg.


Su H.,Kunming University of Science and Technology
Yi chuan = Hereditas / Zhongguo yi chuan xue hui bian ji | Year: 2013

As a barrier to metastasis of cancer, cells that lost contact with the neighbouring cells or extracellular matrix(Extracellular matrix, ECM) will be subjected to apoptosis. This cell death process has been termed "anoikis". When normal epithelial cells or solid tumor cells without metastatic potential detach from the primary site, and then enter into the circulatory system, the anoikis mechanism will be activated. The significance of anoikis is to prevent the shedding cells from growing and implanting into other inappropriate sites. Tumor cells, especially several malignant cells that is prone to transfer to distant sites, have properties of anti-anoikis, which facilitates metastasis as well as invasion of tumor cells. The studies found that tumor cells can resist anoikis through multiple mechanisms: the pro-survival pathways are activated by cells autocrine growth factors and paracrine factors derived from neighboring cells; cells change the pattern of integrin expression so that they can receive survival signals from new environment; reactive oxygen species (ROS) activates growth factor receptors in a ligand-independent way to avoid apoptosis; and epithelial-mesenchymal transformation(EMT) is activated etc.. All of these mechanisms lead to activation of survival signals and inhibition of apoptotic pathways, and ultimately cause resistance to anoikis as well as metastasis. This paper summarizes the key mechanisms of the current studies on metastasis, which also suggest important targets for cancer therapy.


He X.,Kunming University of Science and Technology
Materials and Manufacturing Processes | Year: 2012

As a well-established modern manufacturing process, laser welding is widely adopted in different industry fields to assemble lightweight structures. Major advances have been made in recent years in laser welding. This article reviews the latest development of finite element analysis of laser welding, in terms of process, damage modeling, fatigue behavior, dynamic characteristics, and laser hybrid welding. Some important numerical issues such as materials modeling, meshing procedure, and failure criteria are discussed. Finite element analysis of laser welding will allow many different laser welding processes to be simulated in order to perform a selection of different system parameters before testing, which would be time-consuming or be prohibitively expensive in practice. The main methods used in finite element analysis of laser welding are discussed and illustrated with brief case studies. © 2012 Copyright Taylor and Francis Group, LLC.


Yang J.,Kunming University of Science and Technology
Communications in Computer and Information Science | Year: 2012

The outsourcing of human resources management is also playing an important role in reducing cost, strengthening the core competence of enterprises and realizing professional human resource management. On the other hand, along with the development of China's economy, it is more and more domestic enterprises to go abroad, and become multinational enterprise. This paper studies of human resource management outsourcing from the economic point of. The transaction cost theory, agency theory game theory, such as tool, the decision, supervision and incentive compensation outsourcing service providers. © 2012 Springer-Verlag Berlin Heidelberg.


Yin H.L.,Yunnan Normal University | Wang Y.M.,Kunming University of Science and Technology
Chinese Control Conference, CCC | Year: 2013

Flexible job shop scheduling problem is a kind of typical production scheduling problems. There are more constraints exists in practical circumstance. This paper has a deep research on flexible job shop scheduling problem with sequence dependent setup time and different type of machines in one workgroup. At first, problem formulation is given; then we construct the mathematic model for the multi-constraints scheduling problems; design the encoding and decoding scheme of problem solution; at last, experiments have done for algorithm validation. Experiments results show that two-stage tabu search algorithm proposed in this paper can get better solution than many classic algorithms and the algorithm is fit for large scale multi-constraints flexible job shop scheduling problems. © 2013 TCCT, CAA.


Sun Z.,Central South University | Huang Q.,Central South University | He T.,Central South University | Li Z.,Central South University | And 2 more authors.
ChemPhysChem | Year: 2014

This manuscript presents a brief overview of recent advances in multistimuli-responsive supramolecular gels (MRSGs). The synthesis of MRSGs with faster and smarter responsive abilities to a variety of external stimuli, such as redox reagents, pH changes, ligands, and coupling reagents, is one key issue for the upgrade of current molecular motors, signal sensors, shape memory devices, drug delivery systems, display devices, and other devices. However, the design rules of MRSGs are still not well understood. The lack of information about the relationship between the spatial structure and gelation behavior of existing gelators means that the knowledge required to design new gelators by the addition of functional moieties to well-known gelators is lacking. Insights into the gelation pathway of known gelators may bring inspiration to researchers who want to exploit elegant designs and specific building blocks to obtain their own MRSGs with predictable stimuli-responsive abilities. Multitalented gels: Multistimuli-responsive supramolecular gels (MRSG) are regarded as ideal templates for industrial and biological processes. However, MRSGs are rare because it is a tough challenge to design and fabricate soft materials with multistimuli responsiveness. The authors highlight the design rationale, recent advances, and future perspectives of MRSGs. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Duan W.-L.,Kunming University of Science and Technology
Chinese Journal of Physics | Year: 2014

In view of the same time delay in active and passive transport processes with colored noises of intracellular Ca2+, the interspike intervals (ISI) of calcium spikes of the intracellular calcium oscillation (ICO) are investigated by means of a second-order algorithm for the stochastic simulation of colored noises. Because the ICO exhibits anti-synchronous oscillation, thus we respectively compute the average ISI and its standard deviation (SD) of calcium spikes in the cytosol and endoplasmic reticulum (ER) with different time delays and strengths of colored noises. The results indicate that: (i) the average ISI are equal for the cytosol and ER, and have linear growth as the time delay prolongs. (ii) The average ISI firstly increases then remains steady as the colored noises strengthen. (iii) However, both SDs vs. time delay show that coherence resonance occurs. © 2014 The Physical Society of the Republic of China.


Li C.,Baoji University of Arts And Sciences | Li J.,Kunming University of Science and Technology | He M.,Baoji University of Arts And Sciences
International Journal of Machine Learning and Cybernetics | Year: 2016

Incomplete contexts are a kind of formal contexts in which information about the relationship between some objects and attributes is not available or is lost. Knowledge discovery in incomplete contexts is of interest because such databases are frequently encountered in the real world. The existing work has proposed an approach to construct the approximate concept lattice of an incomplete context. Generally speaking, however, the huge nodes in the approximate concept lattice make the obtained conceptual knowledge difficult to be understood and weaken the efficiency of the related decision-making analysis as well. Motivated by this problem, this paper puts forward a method to compress the approximate concept lattice using K-medoids clustering. To be more concrete, firstly we discuss the accuracy measure of approximate concepts in incomplete contexts. Secondly, the similarity measure between approximate concepts is presented via the importance degrees of an object and an attribute. And then the approximate concepts of an incomplete context are clustered by means of K-medoids clustering. Moreover, we define the so-called K-deletion transformation to achieve the task of compressing the approximate concept lattice. Finally, we conduct some experiments to perform a robustness analysis of the proposed clustering method with respect to the parameters ε and K, and show the average rate of compression of approximate concept lattice. © 2014, Springer-Verlag Berlin Heidelberg.


Yi J.-H.,Kunming University of Science and Technology
Rare Metals | Year: 2014

Samarium–cobalt rare-earth (Sm–Co-RE) permanent magnetic materials with large magnetic energy product, high coercive force, high Curie temperature, good thermal stability, and corrosion resistance, have wide potential applications in aerospace, microwave communications, instrumentation, electrical engineering, magnetic machinery, etc. In this paper, the development of Sm–Co-RE permanent magnetic materials in the following aspects in recent years was summarized: Sm–Co-RE permanent magnets with high application temperatures, positive temperature coefficients of coercive force, zero temperature coefficients of residual magnetization, high resistance rate, high mechanical property, and nanocrystallization. © 2014, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.


Jia H.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2010

Objective: To develop a double antibody sandwich ELISA method for quantitative determination of EV71 antigen during production of inactivated EV71 vaccine. Methods: Monoclonal and polyclonal antibodies against EV71 antigen were prepared by immunizing rabbits with complete EV71. A double antibody sandwich ELISA method was developed using polyclonal antibody as coating antibody and HRP-labeled monoclonal antibody as enzyme-labeled antibody and used for determination of EV71 antigen content in test samples, then verified and applied. Results: The linear range and R 2 value of the developed ELISA method were 5-80 U/ml and 0.994 respectively, indicating good linearity. The quantitation limit of the developed method was 5 U/ml. The recovery rate of internal reference of EV71 antigen at various concentrations was 88%-119.0%, with a variation coefficient of less than 15%. No cross reaction with harvested hepatitis A virus liquid, inactivated Japanese encephalitis virus liquid, influenza H5N1 virus cleavage vaccine, calf serum, human albumin, Vero cells, MEM or harvested CoxA16 liquid was observeed. The determination result of EV71 antigen content in test samples of bulk of inactivated EV71 vaccine during purification reflected the tendency of antigen purification. The developed method showed high accuracy in determination of antigen content in dissociated final product of EV71 vaccine adsorbed onto aluminium salt. Conclusion: A double antibody sandwich ELISA method for quantitative determination of EV71 antigen was developed, which showed good linearity and high specificity, sensitivity, accuracy and reproducibility and might be used for quantitative determination of antigen in EV71 vaccine during production and in final product.


Xu J.-W.,Kunming University of Science and Technology | Zhong J.-J.,Shanghai JiaoTong University
Bioengineered | Year: 2015

Ganoderma lucidum is a well-known traditional medicinal mushroom that produces ganoderic acids with numerous interesting bioactivities. Genetic engineering is an efficient approach to improve ganoderic acid biosynthesis. However, reliable genetic transformation methods and appropriate genetic manipulation strategies remain underdeveloped and thus should be enhanced. We previously established a homologous genetic transformation method for G. lucidum; we also applied the established method to perform the deregulated overexpression of a homologous 3-hydroxy-3-methyL-glutaryl coenzyme A reductase gene in G. lucidum. Engineered strains accumulated more ganoderic acids than wild-type strains. In this report, the genetic transformation systems of G. lucidum are described; current trends are also presented to improve ganoderic acid production through the genetic manipulation of G. lucidum. © 2015 Taylor & Francis Group, LLC.


He X.,Kunming University of Science and Technology
International Journal of Adhesion and Adhesives | Year: 2014

Increasing applications of adhesively bonded joints require understanding of the stress distribution along the bond-line and the stresses that are responsible for the joint failure. The effect of boundary conditions on the actual stress distributions of a single-lap adhesively bonded joint was investigated using the three dimensional finite element method. Specifically, finite element solutions of the stress distributions in the adhesive layer have been obtained for three typical boundary conditions. The results indicate that though the stress distributions of a single-lap adhesively bonded joint are strongly affected by the boundary conditions of the joint, the stress concentrations are confined to a very small region near (or at) the free ends of interfaces between the adherend and the adhesive layer while the centre region of the adhesive layer is mostly stress-free. Thus, the load-bearing capability of a single-lap adhesively bonded joint may not be significantly reduced by the existence of bubbles within the bulk of the adhesive which is an important problem in actual mass production. © 2014 Elsevier Ltd.


He X.,Kunming University of Science and Technology
International Journal of Adhesion and Adhesives | Year: 2014

Adhesively bonding is a high-speed fastening technique which is suitable for joining advanced lightweight sheet materials that are dissimilar, coated and hard to weld. In this paper, the free torsional vibration characteristics of adhesively bonded single-lap joints are investigated in detail using finite element method. The effectiveness of finite element analysis technique used in the study is validated by experimental tests. The focus of the analysis is to reveal the influence on the torsional natural frequencies and mode shapes of these joints caused by variations in the material properties of adhesives. It is shown that the torsional natural frequencies and the torsional natural frequency ratios of the adhesively bonded single-lap joints increases significantly as the Young′s modulus of the adhesives increase, but only slight changes are encountered for variations of Poisson's ratio. The mode shapes analysis show that the adhesive stiffness has a significant effect on the torsional mode shapes. When the adhesive is relatively soft, the torsional mode shapes at the lap joint are slightly distorted. But when the adhesive is relatively very stiff, the torsional mode shapes at the lap joint are fairly smooth and there is a relatively higher local stiffening effect. The consequence of this is that higher stresses will be developed in the stiffer adhesive than in the softer adhesive. © 2013 Elsevier Ltd.


Yang B.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

In business you can get a number of data about customer information. How to find useful information for business decision-making from so many complicated, messy data and then to perform customer value assessment is a very important and complicated process. In this paper, data mining topics id identified as customer value assessment to assess customer value through data mining and statistical methods, in order to support the company's marketing decision making and customer relationship management decision making. © (2014) Trans Tech Publications, Switzerland.


Li J.-W.,Shanghai University | Tang L.-L.,Shanghai University | Li S.-H.,Kunming University of Science and Technology | Wu X.-C.,Shanghai University
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Combining with the low temperature material properties and the boiling heat transfer coefficient of specimen immersed in the liquid nitrogen, a numerical model based on metallo-thermo-mechanical couple theory was established to reproduce the deep cryogenic treatment (DCT) process of a newly developed cold work die steel Cr8Mo2SiV (SDC99). Moreover, an experimental setup for rapid temperature measurement was designed to validate the simulation results. The investigation suggests that the differences in temperature and cooling rate between the surface and core of specimen are very significant. However, it should be emphasized that the acute temperature and cooling rate changes during DCT are mainly concentrated on the specimen surface region about 1/3 of the sample thickness. Subjected to DCT, the retained austenite of quenched specimen continues to transform to martensite and finally its phase volume fraction reduces to 2.3. The predicted results are coincident well with the experimental data, which demonstrates that the numerical model employed in this study can accurately capture the variation characteristics of temperature and microstructure fields during DCT and provide a theoretical guidance for making the reasonable DCT procedure. © 2012 The Nonferrous Metals Society of China.


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 adaptive agent system. Because of interior relation complexity of agent in 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 systems by introducing time and color sets. Then, the model of complex adaptive agent system is developed and modeling process is discussed on detail based on Time Colored Petri Nets (TCPN), especially, agent behavior and agent interaction model are created. A case study of steel logistics system by using time colored Petri nets 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. - All rights reserved.


Qian Q.,Yunnan University of Finance and Economics | Liu W.,Kunming University of Science and Technology
International Journal of Fuzzy System Applications | Year: 2016

As a social management and public service sector, it is convenient for the government to collect and use data, and hence business data become the origin of the big data of government. In order to improve the scientific level of government supervision and management, it is necessary to strengthen the scientific arrangement by using the existing service data. This paper takes a successful example of implementation of e-government, which is "basic quality and technical supervision and management information system" using by bureau of quality and technical supervision in Kunming. After obtaining the quality information from the original public database, this paper used the thinking model which combining the quality credit information and the minimum dataset, then choosing candidate factors with importance rating from minimum dataset by using R language and random forest algorithm. At last, forming and analyzing the minimum dataset of enterprise quality credit supervision through logical argument. © 2016, IGI Global.


Xiao B.,Tulane University | Sun J.,Tulane University | Ruzsinszky A.,Tulane University | Feng J.,Kunming University of Science and Technology | Perdew J.P.,Tulane University
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

We have assessed the performance of the non-self-consistent random phase approximation (RPA) on two pressure-induced structural phase transitions, diamond to β-Sn Si in Si and α-quartz to stishovite in SiO 2. The calculated equilibrium lattice properties of the four structures are in better agreement with experimental results than are those from several semilocal functionals. The energy differences between the high- and low-pressure phases are found to be 0.37 eV/Si and 0.39 eV/SiO 2, respectively. The transition pressure obtained from our RPA calculations for diamond to β-Sn in Si is 12.2 GPa, in excellent agreement with the experimental value 11.3-12.6 GPa. However, the α-quartz to stishovite phase-transition pressure in SiO 2 is found to be 5.6 GPa, lower than the experimental 7.46 GPa; the Perdew-Burke-Ernzerhof (PBE) semilocal functional gives the transition pressure closest to experiment in this case. We conclude that the non-self-consistent, nonlocal RPA accurately describes the insulator-to-metal transition in Si, where semilocal density functionals tend to fail. But the RPA error cancellation that is nearly perfect in many solids, including Si, may be less perfect in solid SiO 2, as it is in many molecules. © 2012 American Physical Society.


Feng C.-Z.,Dehong Teachers College | Duan W.-L.,Kunming University of Science and Technology
Indian Journal of Physics | Year: 2013

Algorithm for mean first-passage time is presented in multi-dimension stochastic dynamical system by means of stochastic simulation based on stochastic differential equations. © 2013 IACS.


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.


Zhang W.Y.,Zhejiang University of Finance and Economics | Hong W.-C.,Oriental Institute of Technology | Dong Y.,University of Sichuan | Tsai G.,Smart Network System Institute | And 2 more authors.
Energy | Year: 2012

The electric load forecasting is complicated, and it sometimes reveals cyclic changes due to cyclic economic activities or climate seasonal nature, such as hourly peak in a working day, weekly peak in a business week, and monthly peak in a demand planned year. Hybridization of support vector regression (SVR) with chaotic sequence and evolutionary algorithms has successfully been applied to improve forecasting accuracy, and to effectively avoid trapping in a local optimum. However, it has not been widely explored to employ SVR-based model to deal with cyclic electric load forecasting. This paper will firstly investigate the potentiality of a novel hybrid algorithm, namely chaotic genetic algorithm-simulated annealing algorithm (CGASA), with an SVR model to improve load forecasting accurate performance. In which, the proposed CGASA employs internal randomness of chaotic iterations to overcome premature local optimum. Secondly, the seasonal mechanism will then be applied to well adjust the cyclic load tendency. Finally, a numerical example from an existed reference is employed to compare the forecasting performance of the proposed SSVRCGASA model. The forecasting results show that the SSVRCGASA model yields more accurate forecasting results than ARIMA and TF-ε-SVR-SA models. © 2012 Elsevier Ltd.


Gan Z.,Kunming University of Science and Technology | Tao L.,China Shipbuilding Trading Kunming Co.
Applied Mechanics and Materials | Year: 2013

The automated guided vehicles (AGVs) dispatching problem has been addressed to a large extent in literature.most of vehicle dispatching rules used in literature are single-attribute dispatching rules and sensitive to the facility layout.In this research, a new multi-attribute dispatching rule is proposed for AGVs and compare its performance with that of two of the best dispatching rules in literature.Using simulation, we prove that the new multi-attribute dispatching rule perform well and is robust under different working conditions. © (2013) Trans Tech Publications, Switzerland.


Dai Z.,Yunnan University | Wang C.,Kunming University of Science and Technology | Liu J.,Qujing Normal University
Pramana - Journal of Physics | Year: 2014

A new method, homoclinic (heteroclinic) breather limit method (HBLM), for seeking rogue wave solution to nonlinear evolution equation (NEE) is proposed. (1+1)-dimensional Boussinesq equation is used as an example to illustrate the effectiveness of the suggested method. Rational homoclinic wave solution, a new family of two-wave solution, is obtained by inclined periodic homoclinic breather wave solution and is just a rogue wave solution. This result shows that rogue wave originates by the extreme behaviour of homoclinic breather wave in (1+1)-dimensional nonlinear wave fields. © Indian Academy of Sciences.


Duan W.-L.,Kunming University of Science and Technology
Chinese Journal of Physics | Year: 2014

In view of the same time delay in the active and passive transmission processes with colored noises of the intracellular Ca2+, by means of a second-order algorithm for stochastic simulation of colored noises, the effect of colored noises on the normalized autocorrelation function (NAF) and characteristic correlation time (CCT) of the cytosolic and calcium store's Ca2+ concentrations are presented, respectively. The results indicate that: (1) NAFs of the cytosolic and calcium store's Ca2+ concentrations all appear with almost periodic oscillation, and they decrease as colored noises strengthen but increase as the correlation time of the colored noises is prolonged; (2) the correlation of the intracellular calcium oscillation (ICO) system is decreased by strong colored noises. © 2014 The Physical Society Of The Republic Of China.


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.


Li S.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2012

Because of PASSIM 12K cigarette machine improper design, equipment parts wear and tear, and aging sound-absorbing material, unit will generate a lot of noise when running. Through analysis noise spectrum characteristics of main suction cabinet, determine the characteristics of broadband noise spectrum, complete the design of vibration isolation system. And after transforming, measure noise spectrum value of main suction cabinet from 86dB to 76.5 dB. © (2012) Trans Tech Publications.


Luo W.,Kunming University of Science and Technology
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014

China's hydropower development in the Lancang (Mekong) River seems irreproachable and aims to achieve environmental justice from the perspective to address climate change. But the concerns about the adverse impact of the dam to the local and downstream countries' minority and lowincome people are also severe. It is hard to judge whether hydropower development in Lancang (Mekong) river is justice or not, just like a coin has two sides. But by analyze the existing EIA law and its related regulations and measures which have not been effective in creating a meaningful assessment of the true environmental and social impacts of hydropower projects in China, it is may not arbitrary to say further need to be done. © 2014 Taylor & Francis Group, London.


Huang Z.,Tsinghua University | Feng J.,Tsinghua University | Feng J.,Kunming University of Science and Technology | Pan W.,Tsinghua University
Journal of Solid State Chemistry | Year: 2012

The crystal structure, electronic properties, elastic properties, hardness and thermodynamic properties of the laser host material zircon-type YVO 4 are studied using the pseudopotential plane wave method within the local density approximation (LDA) and generalized gradient approximation (GGA). The calculated ground state values such as lattice parameter, bulk modulus and its pressure derivative, the band structure and densities of states were in favorable agreement with previous works and the existed experimental data. The elastic constants C ij, the aggregate elastic moduli (B, G, E), Poissons ratio and elastic anisotropy have been investigated. In YVO 4, VO bonds with shorter bond length and larger Mulliken population make great contribution to hardness than YO bonds. Using quasi-harmonic Debye model considering the phonon effects, bulk modulus, heat capacity and thermal expansion coefficient of YVO 4 are calculated within a range of 06 GPa and 01200 K. © 2011 Elsevier Inc. All rights reserved.


Yin Y.,Kunming University of Science and Technology | Yin Y.,East China Institute of Technology | Wu W.-H.,Kang Ning Junior College | Cheng T.C.E.,Feng Chia University | Wu C.-C.,Feng Chia University
International Journal of Computer Integrated Manufacturing | Year: 2015

In many real-life scheduling situations, the jobs deteriorate at a certain rate while waiting to be processed. This study introduces a new deterioration model where the actual processing time of a job depends not only on the starting time of the job but also on its scheduled position. The objective is to find the optimal schedule such that the makespan or total completion time is minimised. This study first shows that both problems are solvable in O(n log n) time. This study further shows that in both cases there exists an optimal schedule that is the shortest processing time, longest processing time, or V-shaped with respect to the job normal processing times, depending on the relationships between problem parameters. © 2014 Taylor & Francis.


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.


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.


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

Bifurcations of limit cycles created from a multiple critical point of planar dynamical systems are studied. It is different from the usual Hopf bifurcations of limit cycles created from an elementary critical point. This bifurcation phenomena depends on the stability of the multiple critical point and the multiple number of the critical point. As an example, a cubic system which can created four small amplitude limit cycles from the origin (a multiple critical point) is given. © 2011 World Scientific Publishing Company.


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.


Yang E.,CAS South China Botanical Garden | Yang E.,Kunming University of Science and Technology | Fan L.,Agriculture and Agri Food Canada | Jiang Y.,CAS South China Botanical Garden | And 2 more authors.
AMB Express | Year: 2012

The biopreservation of foods using bacteriocinogenic lactic acid bacteria (LAB) isolated directly from foods is an innovative approach. The objectives of this study were to isolate and identify bacteriocinogenic LAB from various cheeses and yogurts and evaluate their antimicrobial effects on selected spoilage and pathogenic microorganisms in vitro as well as on a food commodity. LAB were isolated using MRS and M17 media. The agar diffusion bioassay was used to screen for bacteriocin or bacteriocin-like substances (BLS) producing LAB using Lactobacillus sakei and Listeria innocua as indicator organisms. Out of 138 LAB isolates, 28 were found to inhibit these bacteria and were identified as strains of Enterococcus faecium, Streptococcus thermophilus, Lactobacillus casei and Lactobacillus sakei subsp. sakei using 16S rRNA gene sequencing. Eight isolates were tested for antimicrobial activity at 5°C and 20°C against L. innocua, Escherichia coli, Bacillus cereus, Pseudomonas fluorescens, Erwinia carotovora, and Leuconostoc mesenteroides subsp. mesenteroides using the agar diffusion bioassay, and also against Penicillium expansum, Botrytis cinerea and Monilinia frucitcola using the microdilution plate method. The effect of selected LAB strains on L. innocua inoculated onto fresh-cut onions was also investigated. Twenty percent of our isolates produced BLS inhibiting the growth of L. innocua and/or Lact. sakei. Organic acids and/or H2O2 produced by LAB and not the BLS had strong antimicrobial effects on all microorganisms tested with the exception of E. coli. Ent. faecium, Strep. thermophilus and Lact. casei effectively inhibited the growth of natural microflora and L. innocua inoculated onto fresh-cut onions. Bacteriocinogenic LAB present in cheeses and yogurts may have potential to be used as biopreservatives in foods. © 2012 Yang et al.; licensee Springer.


Yin Y.,Kunming University of Science and Technology | Yin Y.,East China Institute of Technology | Cheng T.C.E.,Hong Kong Polytechnic University | Wan L.,Jiangxi University of Finance and Economics | And 2 more authors.
Computers and Industrial Engineering | Year: 2015

We consider several two-agent single-machine scheduling problems with deteriorating jobs. By deteriorating jobs we mean that the actual processing time of any job of the two agents is an increasing linear function of its starting time. Each agent wants to minimize a certain objective function, which depends on the completion times of its jobs only. The goal is to schedule the jobs such that the performance of the schedule is satisfactory with respect to the objective functions of both agents. We consider six scheduling problems associated with different combinations of the two agents' objective functions, which include the maximum cost, total weighted completion time, discounted total weighted completion time, maximum earliness cost, total earliness, and total weighted earliness. We examine different scenarios depending on the trade-off between the two agents. Under each scenario, we address the computational complexity and solvability issues of various problems that seek to find the optimal solution for one agent, subject to an upper bound on the maximum (earliness) cost of the other agent. © 2015 Elsevier Ltd.


Li Y.,Yunnan University | Zhao K.,Yunnan University | Zhao K.,Kunming University of Science and Technology | Ye Y.,Yunnan University
Nonlinear Analysis: Real World Applications | Year: 2011

This paper considers a delay nonautonomous LotkaVolterra type multispecies competitive system with harvesting terms. The model has the intraspecific competition terms defined by functions which depend on population densities. An existence theorem of 2n positive periodic solutions is established by using the coincidence degree theory. An example is given to illustrate the effectiveness of our result. © 2010 Elsevier Ltd. All rights reserved.


Wang Y.,Kunming University of Science and Technology
Journal of Applied Physics | Year: 2014

We have formulated a transfer matrix method to investigate electronic properties of graphene heterostructure consisting of monolayer graphene and bilayer counterpart. By evaluating transmission, conductance, and band dispersion, we show that, irrespective of the different carrier chiralities in monolayer graphene and bilayer graphene, superlattice consisting of biased bilayer graphene barrier and monolayer graphene well can mimic the electronic properties of conventional semiconductor superlattice, displaying the extended subbands in the quantum tunneling regime and producing anisotropic minigaps for the classically allowed transport. Due to the lateral confinement, the lowest mode has shifted away from the charge neutral point of monolayer graphene component, opening a sizeable gap in concerned structure. Following the gate-field and geometry modulation, all electronic states and gaps between them can be externally engineered in an electric-controllable strategy. © 2014 AIP Publishing LLC.


Wang Y.,Kunming University of Science and Technology
Applied Physics Letters | Year: 2014

We propose a silicene-based lateral resonant tunneling device by placing silicene under the modulation of top nonmagnetic/ferromagnetic/nonmagnetic sandwich nanogates. Following the electric-tunable bandgap of silicene, lateral double-barrier structure is formed by imposing the flexible electrostatic modulation on top gates. By aligning the spin and valley-resolved confined states in magnetic well, remarkable spin/valley polarization can be accessed through spinor-relying resonant tunneling mechanism. Under the electrostatic, magnetic, and size manipulation, the confined well state can be efficiently engineered, and the observed spin and valley polarization can be further flexibly tuned, offering some helpful strategies to construct spinor-electronic logic atomically. © 2014 AIP Publishing LLC.


He X.,Kunming University of Science and Technology
International Journal of Advanced Manufacturing Technology | Year: 2010

Clinching is a high-speed mechanical fastening technique for point joining of sheet materials. Published work relating to finite element analysis of clinched joints is reviewed in this paper, in terms of process, strength, and vibration characteristics of the clinched joints. It is concluded that the finite element analysis of clinched joints will help future applications of clinching by allowing system parameters to be selected to give as large a process window as possible for successful joint manufacture. This will allow many tests to be simulated that would currently take too long to perform or be prohibitively expensive in practice. © 2009 Springer-Verlag London Limited.


Zhang G.,University of Kentucky | Shu H.,Kunming University of Science and Technology | Liao Y.,University of Kentucky
Electric Power Systems Research | Year: 2016

Automating analysis and correlation of traveling wave data of the same fault event from two terminals of a transmission line is essential for automated double-ended traveling wave based fault location and disturbance analysis. This paper presents a traveling wave data detection and correlation matching method. This method is capable of detecting disturbance events on transmission lines obtained at different terminals based on synchronized data. The traveling waves caused by the same disturbance tend to be captured by multiple recording devices at different observation points, resulting in a significant change in only a few channels for each captured record. The waveform pixel ratio and the featured line of waveforms are extracted based on the possible disturbances that can be identified and recorded at a local database. The correlated searching and feature matching is executed for the remote record database. The correlated traveling wave data for disturbance events can be acquired and then used for locating the event and further analysis. The proposed method is able to extract the effective traveling wave segment corresponding to the same disturbance event from the database at different observation points. This facilitates the automated double-end location. Test results based on field data have demonstrated the effectiveness of the proposed method. © 2016 Elsevier B.V. All rights reserved.


Na J.,Kunming University of Science and Technology | Na J.,Beijing Institute of Technology | Ren X.,Beijing Institute of Technology | Herrmann G.,University of Bristol | Qiao Z.,Beijing Institute of Technology
Control Engineering Practice | Year: 2011

An adaptive neural controller is proposed for nonlinear systems with a nonlinear dead-zone and multiple time-delays. The often used inverse model compensation approach is avoided by representing the dead-zone as a time-varying system. The "explosion of complexity" in the backstepping synthesis is eliminated in terms of the dynamic surface control (DSC) technique. A novel high-order neural network (HONN) with only a scalar weight parameter is developed to account for unknown nonlinearities. The control singularity and some restrictive requirements on the system are circumvented. Simulations and experiments for a turntable servo system with permanent-magnet synchronous motor (PMSM) are provided to verify the reliability and effectiveness. © 2011 Elsevier Ltd.


Li K.J.,CAS National Astronomical Observatories | Shi X.J.,CAS National Astronomical Observatories | Shi X.J.,Chinese Academy of Sciences | Liang H.F.,Yunnan Normal University | And 4 more authors.
Astrophysical Journal | Year: 2011

The continuous wavelet transformation is used to study the temporal variations of the rotational cycle length of daily sunspot numbers from 1849 January 1 to 2010 February 28, from a global point of view. The rotational cycle length of the Sun is found to have a secular trend, which statistically shows a linear decrease by about 0.47 days during the time interval considered. The empirical mode decomposition analysis of the temporal variations of the rotational cycle length shows an acceleration trend for the surface rotation rate from cycles 11 to 19, but a deceleration trend from the beginning of cycle 20 onward. We cannot determine whether the rotation rate around the maximum times of the Schwable cycles should be faster or slower than that around the minimum times, implying no Schwable cycle in the long-term variations of rotation. The results obtained are compared to those from the literature. It is inferred that the variation of the rotational cycle length may be related to the variation of sunspot activity in the long run. © 2011. The American Astronomical Society. All rights reserved.


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

In this paper, two groups of Dendrocalamus giganteus Munro pulp were obtained fro mconventional kraft pulping (the maximum pulping temperature was 165°C) and low-temperature kraft pulping (the maximum pulping temperature was only 135°C) under the premise of kappa number of about 17, and the viscosity of them were 1240 mL g -1 and 1426 mL g -1 respectively. Then the handsheets was treated with dry heat aging and the simulation of pulp recycling was investigated. In addition, the relationship between the pulp viscosity and recycling times of pulp were studied. The results showed that the viscosity and water retention value of two groups of pulp decreased with increasing of recycling times. However, the recycling characteristic of the pulp with high viscosity from low-temperature kraft cooking was better. © (2012) Trans Tech Publications, Switzerland.


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.


Xu Z.G.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

Molecularly imprinted polymer (MIP) has the characteristics of predetermination, specific recognition and practicability. It can eliminate the interference of complicated matrix. It has been widely used as selective adsorption material in sample preparation. Bisphenol A is a common endocrine disruptor in environment. Its toxic effects and analysis have attracted widespread concern. In this paper, the molecularly imprinted sample preparation techniques for bisphenol A were comprehensively reported, including molecularly imprinted microspheres extraction, molecularly imprinted solid phase extraction, molecularly imprinted solid phase microextraction, molecularly imprinted stir bar sorptive extraction and molecularly imprinted membrane extraction. Moreover, the trends of BPA-molecularly imprinted techniques are prospected. © (2014) Trans Tech Publications, Switzerland.


Zeng Y.,Kunming University of Science and Technology
IET Conference Publications | Year: 2012

The stability of hydro turbine generating units (HTGU) is very important for power systems as it is power supply point. Based on the Hamiltonian model of HTGU, this paper derives the additional Hamiltonian function by means of Casmir function method. Modified Hamiltonian function is a Lyapunov function at given equilibrium, and it can is used to stabilize system. Simulation results show that stabilization control is effective, and can decrease the reverse regulation of active power.


Zheng M.,Kunming University of Science and Technology | Shen L.,Nanjing Southeast University | Feng X.,Nanjing Southeast University
Energy Conversion and Management | Year: 2014

CaSO4 is an attractive oxygen carrier for Chemical-looping combustion (CLC), because of its high oxygen capacity and low price. But the utilization of CaSO4 oxygen carrier suffers the problems of low reactivity, deactivation caused by sulfur loss and the incomplete fuel conversion due to the thermodynamic limitations. To improve the stability and reactivity of CaSO4 oxygen carrier, a small amount of natural iron ore were added in. The kinetic behavior and thermodynamics of the reduction of the binary oxygen carrier by coal under steam atmosphere were investigated. The results show that Fe2O3 improves the performance of coal gasification and the subsequent conversion of coal syngas to CO2 and H2O. Besides, the addition of Fe2O3 reduces the chance of CaSO4 reduction to CaO by coal syngas, and the oxygen transfer capacity of CaSO4 is maintained. The optimal reaction conditions in fuel reactor are shifted from 950 °C without Fe 2O3 to 900°C with 7% Fe2O3. And the decreases in CO, SO2 and H2S environmental factors can be well up to 81.48%, 76.35% and 100%, respectively. Meanwhile, the CO 2 concentration in the dry gas products increases from 81.63% up to 95.35%. © 2014 Elsevier Ltd. All rights reserved.


Zheng M.,Kunming University of Science and Technology | Shen L.-H.,Nanjing Southeast University | Feng X.-Q.,Nanjing Southeast University
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2014

The reactivity between the CaSO4 oxygen carrier with CaO additive and coal under steam atmosphere was studied in a fluidized bed reactor. The experimental results show that the addition of CaO can improve the performance of both coal gasification and CaSO4 reduction, and increase the reaction rate of coal gasification and CaSO4 reduction and the CO2 generating rate. However, the catalysis of CaO drops as the reaction temperature rises. And the optimum reaction temperature is 900°C, at which the releases of gaseous sulfides are remarkably decreased by 63.19% and 27.37% for SO2 and H2S, respectively, as the molar ratio of CaO to CaSO4 is 1.18. Meanwhile, the amount of CO2 absorbed by CaO can be controlled to less than 2%.


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.


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.


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.


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.


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”


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.


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.


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.


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.


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.


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.


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 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.


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.


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.


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.


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.


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.


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.


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.


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.


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 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

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.


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.


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.


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.


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

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.


Ping S.H.,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: 2012

The tree shrew may be an important experimental animal for disease models in humans. The effects of some extenders and momamines on sperm cryopreservation will provide helpful data for experimentation of strains and conservation of genetic resources in tree shrews. Epididymal sperm were surgically harvested from male tree shrews captured around Kunming, China and sperm motility, acrosome integrity and fertility were assessed during cryopreservation. In Experiment 1 eight extenders (TTE, TCG, TCF, TTG, BWW, BTS, DM, and SR) supplemented with 0.4 mol/L DMSO were used to dilute the sperm: only TTE, DM and SR showed no differences in motility and acrosome integrity compared to fresh controls after equilibration. After freezing and thawing, sperm in any extender showed lower motility than fresh control and sperm in DM showed higher motility than other groups. However, BWW produced the lowest motility. For acrosome integrity, TTE and DM showed higher than BWW, BTS and SR after equilibration. The parameter in DM was higher than other groups (except TTE) after thawing. In Experiment 2 four penetrating cryoprotectant agents (CPA) [dimethyl-formamide (DF), formamide (F), dimethylacetamide (DA), and acetamide (A)] at 0.2 mol/L, 0.4 mol/L, 0.8 mol/L, and 1.2 mol/L, respectively were added to the DM extender. Motility showed no difference among CPA groups and non-CPA group (control) after equilibration, but all thawed sperm showed lower values in motility and acrosome integrity than pre-freezing groups. However, sperm in 0.8 mol/L DF and 0.4 mol/L DMSO showed higher values in both parameters than that in other CPA groups (P>0.05). In Experiment 3 the fertilization rate of oocytes inseminated with 0.4mol/L DMSO (50%) were higher than that with 0.8mol/L DF (16%). In conclusion, non-ion extenders supplemented with egg yolk may be better for sperm cryopreservation in tree shrews and cryoprotectant effects of monoamines agents should be further studied in this species.


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.


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

For a differential equation in the Chazy class XI (N = 3), the corresponding three-dimensional system is studied by using dynamical system methods and Cosgrove's results. In all level sets, the exact explicit parametric representations of homoclinic orbits, the families of heteroclinic orbits and periodic orbits, as well as the families of unbounded solutions are obtained. © 2011 World Scientific Publishing Company.


Chen G.,Kunming University of Science and Technology | Wen J.,Liuzhou OVM Machinery Co.
Journal of Mechanical Science and Technology | Year: 2015

Although there are a large number of studies on large rolling bearings, analyses are seldom for the effects of size and raceway hardness on their fatigue life. In this study, taking the four contact-point ball bearings as an example, the fatigue lives of large rolling bearings with different structure sizes were calculated through the stress life (σ-N), strain life (ε-N) and international standard (ISO) methods, respectively. The maximum contact force and subsurface stress in the raceway were obtained with the finite element method. At the same time, the effect of raceway hardening depth on bearing life was taken into account. Results showed that the effect of raceway hardening depth on the life of large rolling bearing was obvious. Thus, the raceway hardening depth cannot be ignored when calculating the fatigue life of large rolling bearing. When used with the load at the same level, the rolling bearing with larger size usually had less the fatigue life. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.


Liu Q.-L.,Yunnan University | Zhao Z.-Y.,Kunming University of Science and Technology | Liu Q.-J.,Yunnan University
RSC Advances | Year: 2014

In order to confirm the doping effects of sulfur on the photocatalytic performance of TiO2, the crystal structure, electronic structure, and optical properties of S-doped anatase and rutile TiO2, in which sulfur impurity occupies the lattice oxygen or titanium sites and the interstitial sites, were calculated by density functional theory within GGA + U method. If sulfur impurity incorporates into anatase and rutile lattice by the same doping mode, it exhibits similar doping effects (including lattice distortion, variation of band gap, localized defect states, and type and position of impurity energy levels). However, there are some subtle different doping effects between different crystal structures or different doping modes. According to the calculated results and basic relationship between electronic structure and photocatalytic performance, it is determined that sulfur interstitial doping in anatase TiO2 processes optimal modification effects due to its shallow impurity energy levels, located at the top of the valence and the bottom of the conduction band, which could not only improve the absorption of visible light, but also suppress the recombination of photo-generated electron-hole pairs. © the Partner Organisations 2014.


He X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2010

Adhesive bonding is a high-speed fastening technique which is suitable for joining advanced lightweight sheet materials that are dissimilar, coated and hard to weld. Major advances have been made in recent years in adhesive bonding technique. Latest literature relating to finite element analysis (FEA) of adhesively bonded single-lap joints (SLJs) is reviewed in this paper. The recent development in FEA of SLJs is described with particular reference to three major factors that influence the success of adhesive bonding technique: failure mechanism, environmental effects and mechanical behavior. The main FE methods used in FEA of SLJs are discussed and illustrated with brief case studies from the literature. Areas where further useful progress can be made are also identified. © (2010) Trans Tech Publications.


Li W.B.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

The permeability of coarse-grained soil is influenced by many factors. The results of permeability tests in different conditions indicate the effects of coarse-grained soil dry density of, fines content P5, void ratio e and nonuniform coefficient Cu to the permeability coefficient. Analyzing the relationship between coarse-grained soil dry density, fines content P5, void ratio e, nonuniform coefficient Cu and permeability coefficient, thus there is a relational expression between coarse-grained soil dry density of soil, fines content P5, void ratio e, nonuniform coefficient Cu and permeability coefficient. © (2014) Trans Tech Publications, Switzerland.


Li J.,Kunming University of Science and Technology | Zhu W.,Zhejiang Normal University
International Journal of Modern Physics B | Year: 2016

For a class of nonlinear diffusion–convection–reaction equations, the corresponding travelling wave systems are well known Liénard systems. Under Chiellini’s integrability condition, the first integrals of Liénard systems can be obtained. In this paper, we use the method of dynamical systems to study the dynamical behavior of the corresponding travelling wave systems of two classes of nonlinear wave equations. Under given parametric conditions, some exact explicit parametric representations of the monotonic and nonmonotonic kink wave solutions are obtained. © 2016 World Scientific Publishing Company


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.


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.


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).


He X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2010

This study deals with an application of the method of the coefficient of variation in strength prediction of the self-piercing riveted joints. Defined as the ratio of the standard deviation to the mean, the coefficient of variation may be used in both the reliability-based design of self-piercing riveted joints and in the evaluation of existing products. In this study, the concept and definition of the coefficient of variation are stated. The procedure of the use of coefficient of variation for approximate calculations of strength of the self-piercing riveted joints is presented and compared with the classical Taylor expansion method. This is illustrated with a numerical example. © (2010) Trans Tech Publications.


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.


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.


Li J.,Kunming University of Science and Technology
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2011

Based on the optical system using a monochrome charge coupled device (CCD) to record digital color hologram and diffraction's numerical calculation theory, the common algorithms for digital color holographic wavefront reconstruction is reviewed comprehensively, and an important improvement on an algorithm applied only to static physical detection is made. The improvement not only eliminates the frequency spectrum aliasing effect to the reconstructed wavefield, but also lets the algorithm appropriate for dynamic physical detection of real-time digital holography. Finally, the research work is promoted in the optical system, which using a color CCD to record digital color hologram, and gives an example of reconstructed object color image under illumination of three color lights.


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

The purpose of this study is to find the key factors influencing the tunnel collapse accident, and explore the causal relationships between the causations of the tunnel collapse accident. Based on document surveys and Delphi Method, a system of the causation indicators of the collapse accident is established. In order to make sure that the hierarchy structure of the causation index system of the tunnel collapse accident is illustrative and reasonable, a new method of system structure analysis is proposed based on the integration of Decision making trial and evaluation laboratory (DEMATEL) and Interpretive structure model (ISM). Applying this method, the center degree and the reasoning degree of the causation are obtained firstly, and then the system hierarchy structure of the causation index system of the tunnel collapse accident is actualized. The results showed that the main causes of the tunnel collapse accident are derived from management. This research reveals the interaction relations of the causations of tunnel collapse accident, based on which this research also provides strong theory and methods to support dynamic decision and quantitative risk assessment in tunnel construction. © (2014) Trans Tech Publications, Switzerland.


Luo H.,Kunming University of Science and Technology | Wang R.Z.,Shanghai JiaoTong University | Dai Y.J.,Shanghai JiaoTong University
International Journal of Green Energy | Year: 2010

For solar thermal utilization, one of the main objectives is to improve system performance for reducing collector areas. In this article, the optimum heat source temperature for maximizing solar cooling coefficient of performance (COP) of a novel solar adsorption air-conditioning system (SAACS) is investigated theoretically. A mathematical model for the energy balance of the SAACS is developed. The optimum heat source temperature for the SAACS with two types of solar collector is determined by numerical simulation. The simulation results reveal that the solar cooling COP of the SAACS with evacuated tube collector can exceed 0.25 with optimum heat source temperature. Moreover, the SAACS can run with high efficiency in a wide heat source temperature range when the solar radiation is more than 700 W/m2.


Tang Z.-H.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2013

Asthma is a serious disease worldwide, of which the disability and death rates are only seconded to cancer. The financial burden of asthma is heavier than the sum of those of tuberculosis and AIDS. Severe asthma can not be cured by current therapies and treatments, resulting in an urgent need for novel efficient intervention. Clinical researches as well as animal model studies indicate that interleukin-13 (IL-13) plays a key role in asthma pathogenesis. At present, the treatment of asthma with IL-13 monoclonal antibodies (McAbs) has been studied in phase II clinical trial. However, as compared with McAbs, the vaccines eliciting persistent neutralizing antibody against IL-13 is more applicable for chronic diseases such as asthma. This paper reviews the progress in research on anti-IL-13 vaccine for treatment of asthma.


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.


Yang X.,Kunming University of Science and Technology
Inverse Problems | Year: 2014

We study the inverse eigenvalue problem for the half-line random Schrdinger operators. Generalizing results from Mikls Horvth, we obtain optimal and almost optimal conditions for a set of eigenvalues to determine the random Schrdinger operator almost precisely. These conditions are simple closed properties of the random exponential system corresponding to the known eigenvalues. © 2014 IOP Publishing Ltd.


Shen T.,Illinois Institute of Technology | Shen T.,Kunming University of Science and Technology | Yan M.,Agilent Technologies | Wong T.T.Y.,Illinois Institute of Technology
IEEE Transactions on Antennas and Propagation | Year: 2013

An investigation of the interaction of a conductive sphere with an electromagnetic wave with attention given to space-charge effects would appear timely, as there is much current interest in the electromagnetic properties of mesoscopic structures. In this study, the polarization of a small semiconductor sphere immersed in a dynamic electric field is explored analytically and numerically. In one approach, suitable for a sphere with low to moderate charge carrier concentration, the Poisson's equation is coupled with the transport equations of the carriers, leading to a quasi-static formulation under the weak-field approximation. Screening effects of the charges on the interior field are revealed, along with a current distribution that is essentially uniform over much of the volume of the sphere. Frequency dependence of the total induced dipole moment of the sphere displays strong dispersion and absorption near the bulk plasma frequency. Validity of the quasi-static assumption is assessed by comparison to results of calculations based on a full-wave formulation. As the nominal carrier concentration exceeds 10-20 cm-3, the quasi-static solutions for interior field and current distribution begin to deviate from the full-wave solution and the latter must be employed to provide a realistic account of the charge-wave interaction within the sphere. © 1963-2012 IEEE.


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.


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.


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.


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.


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.


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.


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.


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.


Fayou A.,Kunming University of Science and Technology | Kong J.,CAS Chengdu Institute of Mountain Hazards and Environment | Ni Z.,CAS Chengdu Institute of Mountain Hazards and Environment
Disaster Advances | Year: 2012

In the disaster areas of Wenchuan Earthquake, anti-dip slope is a kind of slope with less development of earthquake-induced mountain disasters, but the excavation often exacerbates the earthquake-induced mountain disasters on slopes. According to the survey, deformation and failure of anti-dip slope is characterized by both collapse and slide. In order to reproduce the deformation and failure process of slope, the deformation and failure laws of slope under seismic loading were analyzed. The slope, where Wangjiaping landslide was located in Longmenshan Town, Pengzhou City, was selected as a typical example of anti-dip slope with excavation failure in this study and indoor physical model tests were carried out on deformation and failure under seismic loading. The results showed that the deformation and failure of slope under seismic loading were exacerbated by excavation. As viewed from failure mode, the deformation and failure of anti-dip slope were characterized by both collapse and slide, consistent with the results of field surveys. The entire process of deformation and failure could be divided into the following phases: the initial stage of earthquake (a gradual connecting process between superficial overburden and bedrock interface), superficial collapse stage on the top of excavated slope, toppling stage of strata with excavation failure and impact fragmentation-slide stage.


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.,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 a generalization of the nonlinear Schrödinger equation where the dispersive term was substituted by a nonlocal integral term with given kernel. The study on this model derives a planar dynamical system with two singular straight lines. On the basis of the investigation of the dynamical behavior and bifurcations of solutions of the planar dynamical system, we obtain all possible explicit exact parametric representations of solutions (including kink wave solutions, unbounded wave solutions, compactons, etc.) under different parameter conditions. The existence of bounded solutions of the planar dynamical system implies that there exist infinitely many breather solutions of this generalized nonlinear Schrödinger system. © 2015 World Scientific Publishing Company.


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.


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.


Wang D.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2012

Based on the grinding and classification process dynamic model, the distributed simulation platform for semi-physical grinding process was analyzed. Based on the feedback correction and dynamic optimal control and optimization model calculated the optimal control law, the quality indicators to feedback regulation mechanism was introduced to eliminate the impact of process disturbances and other uncertainties. Intelligent control unit according to the deviation between the artificial test and expectations of quality indicators can feedback correction of the optimal control law. The field experiment results show that the program to stabilize the process of product quality, to achieve the process of saving energy. The grinding process of the optimal control of distributed simulation platform for the optimal control method and system design provide effective, convenient, reliable and intuitive engineering lab environment. Also it has important reference value to other metallurgical optimization of industrial process control engineering verification and simulation. © (2012) Trans Tech Publications, Switzerland.


Wang C.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: 2012

MicroRNAs (miRNAs) are a newly identified class of small regulatory non-coding endogenous RNAs that take part in a series of important processes by regulating gene expression. Recent studies have provided evidence that miRNAs may be involved in nearly all biological and metabolic processes, especially influencing self-renewal and differentiation of embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs). In this review, we briefly summarize the biological characteristics of miRNAs, the detection technologies, and the role of miRNAs regulation in ESCs and iPSCs to frame a discussion on the future prospects of miRNA research.


Zhu H.,Kunming University of Science and Technology
Yi chuan = Hereditas / Zhongguo yi chuan xue hui bian ji | Year: 2012

p53 is an important tumor suppressor gene and one of the key genes in sensing and regulating responses to the environmental stress. Recent study showed that cold winter temperature naturally selected p53 Arg72 in eastern Asian population, suggesting that p53 plays a role in reproduction. It has also been reported that some SNPs of p53, Mdm2(Murine double minute 2), MdmX and Hausp (Herpes virus-associated ubiquitin-specific protease) in p53 pathway are associated with the risk of the women's reproduction disorder. p53 regulates the LIF (leukaemia inhibitory factor) expression level by its DBD domain, and thus contributes to female reproduction by affecting the embryo implantation process. The MDM2, MDMX, and HAUSP proteins regulates the level and activity of p53 protein, which are critical for the appropriate p53 response in the embryo implantation process. The members of p53 family, p63 and p73, also play roles in female reproduction through other pathways. p63 has been implicated as a major regulator of oocyte death following treatment with irradiation and chemotherapeutic drugs, which prevents fetal malformation. p73 regulates the formation of spindle assembly complex(SAC). The dysfunction of SAC results in poor blastocyst quality and defects in kinetochore-microtubule associations, which leads to aneuploidy. This review summarized the function of p53 family and its pathway related proteins in female reproduction, pointed out a new method in improving the success rate in IVF-ET, and provided a new diagnosis idea for unexplained infertile women. It will facilitate personalized strategies in the infertility therapy.


Tian-Wei-Tian Z.,Kunming University of Science and Technology
Mathematical Methods in the Applied Sciences | Year: 2014

In this paper, we consider a delayed Hassell-Varley-type predator-prey model with harvesting on prey. By means of Mawhin's continuation theorem of coincidence degree theory, some new sufficient conditions are obtained for the existence of at least two positive almost periodic solutions for the aforementioned model. To the best of the author's knowledge, so far, the result of this paper is completely new. An example is employed to illustrate the result of this paper. Copyright © 2013 John Wiley & Sons, Ltd.


He X.,Kunming University of Science and Technology
International Journal of Adhesion and Adhesives | Year: 2012

The need to design lightweight structures and the increased use of lightweight materials in industrial fields, have led to wide use of adhesively bonding in recent years. In the design of mechanical systems, which consist of adhesively bonded joints, for minimum vibration response, a specific knowledge of the damping capacity of the component materials and joints is important. It is believed that adhesively bonded joints act to augment the system damping capacity in view of the increasing use of viscoelastic materials in their design. The aim of this paper is to provide an efficient numerical technique for the prediction of the dynamic response of bonded beams with a single-lap joint and to validate the predictions via experimental tests. The finite element method was used to predict the natural frequencies, mode shapes and frequency response functions of the beams. The dynamic test software and the data acquisition hardware were used in the experimental measurement of the dynamic response of the joints. The frequency response functions of the joints of different adherend widths and of different adhesive layer thickness were measured. The frequency response functions and mode shapes predicted using the finite element method were compared with those measured experimentally. The coordination of the numerical and experimental techniques makes it possible to find an efficient tool for studying the dynamic response of bonded beams with a single-lap joint. © 2012 Elsevier Ltd. All rights reserved.


Zhao Z.-Y.,Kunming University of Science and Technology
Journal of Physical Chemistry C | Year: 2014

The adsorption behavior and decomposition process of a single water molecule on the low-index rutile TiO2 surfaces, including (110), (100), and (001), were systematically investigated by using density functional theory calculations. For both molecular and dissociative adsorption, the adsorption energy on these low-index surfaces increases in the order (110) < (100) < (001), while the activation energy of water partial decomposition reaction increases in the order (100) < (110) < (001). In the case of water adsorption on (001) surface, due to its rather flat surface and the stronger interaction with water molecule or its decomposition products, the adsorption energy for water molecule or its decomposition products is the largest; the activation energy of water decomposition on (001) surface is the smallest; and the final decomposition is two surface-adsorbed hydroxyl radicals. Therefore, the photocatalytic water splitting or photocatalytic reaction on rutile (001) surface is more easily accomplished than that of the other two surfaces. The findings in this Article are consistent with experimental observations in published literature, and will be helpful for future development of efficient photocatalysts. © 2014 American Chemical Society.


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.


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.


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.


Li L.-x.,Kunming University of Science and Technology | Chen H.-t.,Northeast Agricultural University
Advanced Materials Research | Year: 2013

Straw resource was tremendous, however it was utilized poorly. So the research of physical, chemical and mechanical pulping properties of tobacco stalk fiber laid the foundation for utilization of tobacco stalk. Morphology of tobacco stalk fiber was determined by Feica microscope, the length, width and length to wide ratio were analyzed by SPSS 17.0. Chemical composition changes of tobacco stalk fiber after mechanical process were analyzed by applying Block test method with Design-expert 6.0.10. The result present that composition of fiber had significant difference. Hemi-cellulose increased by 3.24%, cellulose increased by 9.62%, lignin increased by 2.52%. Beating degree was positively correlated with the pulping time, beating time and wet weight were a negative correlation. Strength of tobacco stalk fiber was positively with the gramme, and strength was 17 N when gramme was 60 g/m2. © (2013) Trans Tech Publications, Switzerland.


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.


Xia Y.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2012

Taking the opportunity of bridgehead strategy of Chinese central government, Kunming began constructing new airport, the fourth hub airport open to ASEAN and the Eurasia continents. The new international airport is expected to come into service at the beginning of 2012. The successful construction of an airport with modern equipment, however, does not indicate a successful operation. Among questions related to this general issue, a full understanding of the competition environment at Kunming new airport is one of the significant cases for the development of air freight. This paper firstly introduces Porter Five Force model in order to reveal how the competition environment demonstrates at Kunming airport. Then statistics of air throughput in recent three years is shown to certify the conclusion from Porter Five Force model analysis and thereafter follow reasons for the status. Suggestions are posed for how to face up these competitions at the end of this paper. © (2012) Trans Tech Publications, Switzerland.


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.


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.


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.


Huang F.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2012

Objective: To construct a eukaryotic expression vector for hepatitis E virus (HEV) RdRp gene, determine its expressions in PLC/PRF/5, A549 and HepG2 cells and provide an experimental basis for further study on RdRp. Methods: RdRp gene was amplified from HEV-positive feces by RT-nPCR and inserted into eukaryotic expression vector peDNA3. 0, and EGFP report gene was inserted to the 3′-terminus of recombinants to construct fusion expression vector pcDNA3. ORdRp-EGFP which was transfected to PLC / PRF / 5, A549 and HepG2 cells in mediation of liposome. The expression of report gene was observed by fluorescent microscopy, while the transcription of RdRp mRNA was determined by RT-nPCR, and expression of RdRp protein by Western blot. Results: Restriction analysis and sequencing proved that recombinant plasmid pcDNA3. O-RdRp-EGFP was constructed correctly. Both RdRp gene and protein were expressed in A549 and HepG2 cells highly and specifically. Conclusion: The eukaryotic expression vector for RdRp gene was successfully constructed and expressed in a large quantity in A549 and HepG2 cells, which laid a foundation of further study on role of RdRp in replication of HEV.


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.


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.


Ren L.-T.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2012

Moraxella catarrhalis (MC) is an emerging human-specific pathogen responsible for upper and lower respiratory tract infections. Along with the successful inclusion of polyvalent pneumococcal polysaccharide combined vaccine and Haemophilus influenzae type b conjugate vaccine to the immunization programs in many countries, it is necessary to develop vaccines against MC. In recent years, the development of vaccines against MC is at the stage of antigen screening. However, the search for vaccine antigen candidates is focused on the conserved epitopes on the surfaces of pathogenic bacteria. At present, all the candidate antigens were screened based on animal experiments. This paper reviews the progress in research on candidate antigens of MC in recent years.


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.


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.


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.


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.


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.


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.


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.


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.


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.


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.


He S.,Kunming University of Science and Technology
Hydrometallurgy | Year: 2010

The pressure leaching of high silica Pb-Zn oxide ore using air as pressurized gas in sulfuric acid medium is studied systematically in the present paper. Study parameters include the concentration of sulfuric acid, partial air pressure, leaching temperature, leaching time, and liquid-to-solid ratio. The experimental results obtained show that under optimum conditions, the extraction percentage of Zn is up to 96% and the extent of dissolution of Si, Pb, and Fe are as low as 1%, 2%, and 6%, respectively. Leaching pulp had good filter performance, and the silicic acid formed during sulfuric acid leaching was transformed into easily filterable dehydrated SiO2 particles that can enter the slag. The filtration rate can be as high as 893 L/m2 h. © 2010 Elsevier B.V. All rights reserved.


He X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2011

Adhesive bonding is a high-speed fastening method which is suitable for joining advanced lightweight sheet materials that are hard to weld. Latest literature relating to finite element analysis (FEA) of fatigue behaviour of adhesively bonded joints is reviewed in this paper. The recent development in FEA of fatigue behaviour of adhesively bonded joints is described with particular reference to three major factors that influence the fatigue behaviour of adhesively bonded joints: failure mechanism, environmental effects and hybrid joining techniques. The main FE methods used in FEA of fatigue behaviour of adhesively bonded joints are discussed and illustrated with brief case studies from the literature.


Zhao Z.,Nanjing University | Zhao Z.,Kunming University of Science and Technology | Li Z.,Nanjing University | Zou Z.,Nanjing University
Journal of Physical Chemistry C | Year: 2013

With use of the generalized gradient approximation within density functional theory approach combined with periodic slab models, the adsorption and decomposition behaviors of water molecule on N/V-monodoped, and N-V-codoped anatase TiO2 (101) surfaces at gas ambient were studied. By optimizing the geometrical configurations of initial molecular adsorption states, transition states, and final dissociative adsorption states, the adsorption energy of each species and the reaction activation energy data on the reaction pathways were obtained. On N-doped surface, the decomposition reaction pathway of water is changed: the activation energy is reduced and the decomposition reaction is an exothermic reaction, which is favorable for the decomposition of water. On the other hand, V-doped surface is unfavorable for water decomposition. The decomposition reaction of water on the N-V-codoped surface is a structure-sensitive reaction process, i.e., it has a completely different reaction activity on the different surface positions. Due to N-V codoping promoting the generation of surface oxygen vacancies, the adsorption and decomposition behavior of water on TiO2 (101) surface containing oxygen vacancy was also considered, on which the water molecule could be easily decomposed, forming two stable surface-terminated hydroxyl radicals. © 2013 American Chemical Society.


Peng W.,Central South University | Peng W.,Kunming University of Science and Technology | Wang J.,Central South University | Wang W.,Central South University | And 3 more authors.
BMC Systems Biology | Year: 2012

Background: Identification of essential proteins plays a significant role in understanding minimal requirements for the cellular survival and development. Many computational methods have been proposed for predicting essential proteins by using the topological features of protein-protein interaction (PPI) networks. However, most of these methods ignored intrinsic biological meaning of proteins. Moreover, PPI data contains many false positives and false negatives. To overcome these limitations, recently many research groups have started to focus on identification of essential proteins by integrating PPI networks with other biological information. However, none of their methods has widely been acknowledged.Results: By considering the facts that essential proteins are more evolutionarily conserved than nonessential proteins and essential proteins frequently bind each other, we propose an iteration method for predicting essential proteins by integrating the orthology with PPI networks, named by ION. Differently from other methods, ION identifies essential proteins depending on not only the connections between proteins but also their orthologous properties and features of their neighbors. ION is implemented to predict essential proteins in S. cerevisiae. Experimental results show that ION can achieve higher identification accuracy than eight other existing centrality methods in terms of area under the curve (AUC). Moreover, ION identifies a large amount of essential proteins which have been ignored by eight other existing centrality methods because of their low-connectivity. Many proteins ranked in top 100 by ION are both essential and belong to the complexes with certain biological functions. Furthermore, no matter how many reference organisms were selected, ION outperforms all eight other existing centrality methods. While using as many as possible reference organisms can improve the performance of ION. Additionally, ION also shows good prediction performance in E. coli K-12.Conclusions: The accuracy of predicting essential proteins can be improved by integrating the orthology with PPI networks. © 2012 Peng et al.; licensee BioMed Central Ltd.


Chen X.,Kunming University of Science and Technology | Zhang J.,Southwest Jiaotong University
International Journal of Security and its Applications | Year: 2012

Discriminant locality preserving projection(DLPP) can not obtain optimal discriminant vectors which utmostly optimize the objective of DLPP. This paper proposed a Gabor based optimized discriminant locality preserving projections (ODLPP) algorithm which can directly optimize discriminant locality preserving criterion on high-dimensional Gabor feature space via simultaneous diagonalization, without any dimensionality reduction preprocessing. The proposed method is applied to face and finger vein recognition problems and is compared with some other related Gabor based dimensionality reduction techniques. Experimental results conducted on the VALID face database and a subset of PKU finger vein database indicates the effectiveness of the proposed algorithm.


Duan Y.H.,Kunming University of Science and Technology
Journal of Materials Engineering and Performance | Year: 2013

The hot deformation behavior of the novel Pb-Mg-10Al-1B alloy has been investigated by hot compressive tests in the temperature range from 453 to 613 K within the strain rate range of 0.01-1 s-1 using a Gleeble-1500 thermal simulator testing machine. The results show that the flow stress increases with increasing strain rate and decreasing temperature. The hot deformation behavior can be described by a constitutive equation with hyperbolic sine function or Zener-Hollomon parameter. The hot deformation activation energy of Pb-Mg-10Al-1B alloy is 151.2543 kJ/mol. The processing map at the strain of 0.4 exhibits an instable deformation domain of 460-520 K at 0.06-1 s-1. According to the processing map, the optimum hot-working conditions for Pb-Mg-Al-B alloy are 573 K and 0.01 s-1. © 2013 ASM International.


Wang W.,Kunming University of Science and Technology | Wang Q.,Xian University of Technology | Wang Q.,CAS Institute of Soil and Water Conservation
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

There are some problems, such as how to use advanced methods, how to make less work, economical and reasonable experimental design and how to make representative sampling points during soil analysis. The above-mentioned problems are becoming research difficulties and hotspots in recent years. A research on spatial variability of soil hydraulic parameters basin scale in Jinghui Irrigation, Shaanxi Province was made based on GPS and Google Earth methods. The results showed that saturated soil moisture content and saturated hydraulic conductivity moderate variation in the regional scale show out moderate variability and strong spatial dependence. The best-fitting models for saturated soil moisture content and saturated hydraulic conductivity are spherical model and exponential model, respectively. As for the above two, the sample spacing of 2.38 km and 7.14 km are recommended.


He X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2011

This paper deals with the effects of mechanical behavior of adhesives on the shear stress distributions of single-lap adhesive joints under tension using the three-dimensional finite element analysis (FEA) technique. Numerical examples are provided to show the influence on the shear stresses of the joints using adhesives of different characteristics which encompass the entire spectrum of viscoelastic behavior. FEA solutions of the shear stress distributions in the adhesive layer have been obtained for four typical characteristics of adhesives. The results indicate that Young's modulus and Poisson's ratios of adhesives strongly affect the shear stress distributions of the joints. © (2011) Trans Tech Publications, Switzerland.


Huang Z.,Tsinghua University | Zhang L.,Tsinghua University | Feng J.,Tsinghua University | Feng J.,Kunming University of Science and Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2012

The electronic structure, mechanical properties and optical properties of zircon-type GdVO 4 were investigated by both local-spin density approximation (LSDA) band theory with Hubbard term of U and experiments. The calculated equilibrium parameters are in good agreement with experimental results and other reports. The band gap of GdVO 4 calculated is 2.77 eV. The Mulliken analysis shows Gd-O bonds exhibits more ionic than V-O bonds. The elastic constants, the aggregate elastic moduli (B, G, E), and the Poisson's ratio have been investigated from both calculation and experiment and they are in accordance with each other. The optical properties are also calculated, which shows GdVO 4 has high optical isotropy. © 2012 Elsevier B.V. All rights reserved.


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

Android platform data security mechanism and security vulnerabilities in android third party software were introduced. In order to eliminate the potential security threat, detection principle of traditional Trojan feature code was improved. A number of steps such as using c/s structure, establishing the Trojan family model on the server, receiving and checking the client's malicious, returning the results to the client, and the client adopting corresponding operation, as to ensure the information security of mobile phone user were researched. © (2014) Trans Tech Publications, Switzerland.


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.


Na J.,Kunming University of Science and Technology | Ren X.,Beijing Institute of Technology | Zheng D.,Beijing Institute of Technology
IEEE Transactions on Neural Networks and Learning Systems | Year: 2013

Most of the available control schemes for pure-feedback systems are derived based on the backstepping technique. On the contrary, this paper presents a novel adaptive control design for nonlinear pure-feedback systems without using backstepping. By introducing a set of alternative state variables and the corresponding transform, state-feedback control of the pure-feedback system can be viewed as output-feedback control of a canonical system. Consequently, backstepping is not necessary and the previously encountered explosion of complexity and circular issue are also circumvented. To estimate unknown states of the newly derived canonical system, a high-order sliding mode observer is adopted, for which finite-time observer error convergence is guaranteed. Two adaptive neural controllers are then proposed to achieve tracking control. In the first scheme, a robust term is introduced to account for the neural approximation error. In the second scheme, a novel neural network with only a scalar weight updated online is constructed to further reduce the computational costs. The closed-loop stability and the convergence of the tracking error to a small compact set around zero are all proved. Comparative simulation and practical experiments on a servo motor system are included to verify the reliability and effectiveness. © 2013 IEEE.


Wang Z.,Ocean University of China | Wang Z.,University of Massachusetts Amherst | Yu X.,Ocean University of China | Yu X.,University of Massachusetts Amherst | And 3 more authors.
Environmental Science and Technology | Year: 2010

Adsorption on carbon nanotubes (CNTs) may affect the environmental behavior of organic contaminants including antibiotics. In this study, sorption of norfloxacin (NOR) onto graphitized multiwall CNTs (G-CNTs), carboxylated multiwall CNTs (C-CNTs), hydroxylated multiwall CNTs (H-CNTs), and activated carbon (AC) was investigated. All sorption isotherms were highly nonlinear and were fitted well by Freundlich and Polanyi-Manes models. AC showed the highest NOR sorption capacity because of its highest surface area. H-CNTs had much higher NOR sorption than C-CNTs, and the π-π electron donor-acceptor (EDA) interactions could explain the distinction between the two types of CNTs. Comparison of sorption coefficients at different pHs indicates that hydrophobic and electrostatic interaction also played major roles in sorption of NOR on CNTs. Furthermore, high sorption capacity and hysteresis of NOR on CNTs were demonstrated in this study, which needs to be considered for predicting environmental risks of CNTs and NOR. The results from thermodynamic analysis show that sorption of NOR on AC and CNTs was thermodynamically favorableandgenerally endothermic. Sorption site energy analysis illustrates a distribution of sorption energy, consistent with nonlinear isotherms, which indicates the heterogeneous sites on CNTs for NOR adsorption. © 2010 American Chemical Society.


Pan B.,Kunming University of Science and Technology | Xing B.,University of Massachusetts Amherst
European Journal of Soil Science | Year: 2012

The environmental application and risk assessment of manufactured nanoparticles (MNPs) in soil greatly depend on our understanding of the interactions between MNPs and soil components. Because of the complexity of the soil system and the very early stage of MNP research in soil, our understanding of MNP behaviour in this system is very limited. This review summarizes the progress of research on MNPs and their implications for soils. Manufactured nanoparticles are applied deliberately for soil remediation and are also released unintentionally through various other pathways to soil. Their colloidal behaviour in the soil system is discussed by analysing the effect of dissolved organic matter, light irradiation, water chemistry conditions and biological processes. The methods currently used for modelling MNP leaching and transport are summarized and several requirements for model improvement are proposed. The current topics regarding the environmental risks of MNPs (such as identifying the toxicity of MNPs and their dissolved ions, evidence that MNPs may be taken up by soil organisms or the risks of other pollutants as affected by the presence of MNPs) are described. Future research directions are discussed and proposed. © 2012 The Authors. Journal compilation © 2012 British Society of Soil Science.


Zhang M.-F.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2014

Objective: To compare the in vitro immune activities of three kinds of immune regulatory CpG oligodeoxynucleotide (CpG ODN) adjuvant. Methods: Peripheral blood mononuclear cells (PBMCs) and human dendritic cell line GEN were stimulated with three kinds of CpG ODN, i.e. CpG ODN 684 (Walvax), CpG ODN 1018 (Dynavax) and CpG ODN 7909 (Coley) in vitro separately. The proliferation activity of PBMCs were determined by 3H-TdR incorporation method, while the IL-6 and IFNα levels in GEN cells by ELISA. Results: The proliferation levels of PBMCs stimulated with the three kinds of CpG ODN were significantly higher than those unstimulated (P < 0.000 1), of which those stimulated with CpG ODN 684 and CpG ODN 7909 were similar and were significantly higher than that with CpG ODN 1018. All the three kinds of CpG ODN adjuvant showed significantly activated the immune cells in vitro. However, the Il-6 and IFNα levels in immune cells activated with CpG ODN 684 and CpG ODN 7909 were similar, which were higher than those with CpG ODN 1018. Conclusion: CpG ODN 684 (Walvax) was similar to CpG ODN 7909 (Coley), while was superior to CpG ODN 1018, in activation of immune cell function in vitro.


Mao P.-J.,Kunming University of Science and Technology
Chinese Journal of Biologicals | Year: 2014

Objective: To isolate the bacteriophages of Salmonella paratyphi A and analyze its biological characters. Methods: The bacteriophages of S. paratyphi A was isolated from sewage, determined for titer by plaque formation assay, observed for morphology by electron microscopy after concentration and purification, and analyzed for sensitivities to pH value (1-12) and temperature (40, 50, 60, 70 and 80 °C). S. paratyphi A and its bacteriophages were cultured, of which the one-step growth curves were plotted using culture time as abscissa and the corresponding bacteriophage as ordinate, and the outbreak level of bacteriophages, optimal MOI and mutation rate of S. paratyphi A were determined. The genome of bacteriophages was extracted and analyzed for DNA by enzyme digestion. The capsid protein of S. paratyphi A was analyzed by SDS-PAGE. Lipopolysaccharide (LPS) was extracted by hot phenol method, while the outer membrane protein (OMP) by phenylmethanesulfonyl fluoride (PMS) method, and the receptor of S. paratyphi A was analyzed preliminarily. Results: Paratyphi A bacteriophage was isolated from sewage of the hospital, of which a long tail and a head were observed by electron microscopy, and transparent plaques at various sizes on double layer counting plate, at titers of 109-10 10 PFU. The titer of bacteriophages was high at pH 3-10, while decreased significantly at temperatures of more than 40 °C with the increasing temperature. However, at 80 °C, few active bacteriophages were observed. The incubation period, outbreak period, outbreak level and optimal MOI of bacteriophages were 20 min, 50 min, 129 and 0.2 respectively, while the mutation rate of S. paratyphi A was 5.8 x 10-7-2.2 x 10-6. The specific band at a length of 33 bp was obtained by digestion of S. paratyphi A with EcoR I and Hind III , and four major bands were observed on SDS-PAGE profile. Both LPS and OMP were the receptors of S. paratyphi A. Conclusion: Paratyphi A bacteriophages were long tail phage, of which the genome was dsDNA at a length of 33 bp, the optimal MOI was 0.2 and the receptors were OMP and LPS.


Tao D.-P.,Kunming University of Science and Technology
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2014

Prediction expressions of component activity coefficients of the molecular interaction volume model (MIVM) are suggested for making up for absence of Wagner interaction parameters in Si-based melts. Their effectiveness is verified in liquid Fe-Si-B system at 1823 K (1550 C). In comparison with experimental data, all errors of ±22 to 56 pct and deviations of ±0.0132 to 0.0318 predicted by MIVM are smaller than those (±53 to 94 pct and ±0.0759 to 0.1010) by the unified interaction parameter formalism. This indicates that the former is better than the later in the system. Accordingly, some interested thermodynamic diagrams and parameters at 1687 K and 1823 K (1414 C and 1550 C) are predicted in liquid Si-Al-Fe system, for instance, εAl Al = 2.318, εFe Fe = 4.297, = εFe Al = - 2.443 in the dilute solution at 1687 K (1414 C). The method of MIVM is able to expand to Si-based multicomponent melt if its sub-binary activity data are available. The reliability of predicted results for the melt is closely dependent upon that of component activities or infinite dilute activity coefficients in its sub-binary systems. © 2013 The Minerals, Metals & Materials Society and ASM International.


Li H.,Kunming University of Science and Technology | Chai Y.,Chongqing University | Li Z.,Chongqing University
Machine Vision and Applications | Year: 2013

In this paper, a new multifocus image fusion scheme based on the technique of focused pixels detection is proposed. First, a new improved multiscale Top-Hat (MTH) transform, which is more effective than the traditional Top-Hat transform in extracting focus information, is introduced and utilized to detect the pixels of the focused regions. Second, the initial decision map of the source images is generated by comparing the improved MTH value of each pixel. Then, the isolated regions removal method is developed and employed to refine the initial decision map. In order to improve the quality of the fused image and avoid the discontinuity in the transition zone, a dual sliding window technique and a fusion strategy based on multiscale transform are developed to achieve the transition zones fusion. Finally, the decision maps of the focused regions and the transition zones are both used to guide the fusion process, and then the final fused image is formed. The experimental results show that the proposed method outperforms the conventional multifocus image fusion methods in both subjective and objective qualities. © 2013 Springer-Verlag Berlin Heidelberg.


Lu J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

The magentic susceptibility of rocks, breccia, dolomite, diabase, slate, siltstone and tuff are main concern, have been measured in the Dongchuan region of Yunnan, China. The experimental data suggest that different rocks have different magnetic susceptibility, and magentic susceptibility of igneous rocks is the highest and has big variation, that is represented by diabase, and these characteristics always react on identification of rock types quickly in the field operation and laboratory technique. As an economic and effective technique, the magentic susceptibility is important magnetic parameters for the rocks in Dongchuan, at the same time is also an obvious sign in looking for cupreous magnetite. © (2014) Trans Tech Publications, Switzerland.


Huang M.,Yunnan University | Yang J.,Yunnan University | Jun S.,Kunming University of Science and Technology | Mu S.,Yunnan University | Lan Y.,Yunnan University
Sensors | Year: 2011

Metamaterials are artificial media structured on a size scale smaller than the wavelength of external stimuli, that may provide novel tools to significantly enhance the sensitivity and resolution of the sensors. In this paper, we derive the dispersion relation of hollow cylindrical dielectric waveguide, and compute the resonant frequencies and Q factors of the corresponding Whispering-Gallery-Modes (WGM). A metamaterial sensor based on microring resonator operating in WGM is proposed, and the resonance intensity spectrum curves in the frequency range from 185 to 212 THz were studied under different sensing conditions. Full-wave simulations, considering the frequency shift sensitivity influenced by the change of core media permittivity, the thickness and permittivity of the adsorbed substance, prove that the sensitivity of the metamaterial sensor is more than 7 times that of the traditional microring resonator sensor, and the metamaterial layer loaded in the inner side of the microring doesn't affect the high Q performance of the microring resonator. © 2011 by the authors; licensee MDPI, Basel, Switzerland.


Bao R.,Central South University | Yi J.,Central South University | Yi J.,Kunming University of Science and Technology | Zhang H.,Central South University | Peng Y.,Central South University
International Journal of Refractory Metals and Hard Materials | Year: 2012

The microwave sintering technique has been used in WC-Co alloy preparation for many years. The properties of the alloy can be improved using the microwave method even in a very short processing cycle. In this work, the influencing factors of the heating rate on WC-8Co hard metal during the microwave processing were discussed by using a multi-mode high temperature furnace. The experimental results demonstrate that the assisted materials principally contribute to heat insulation, rather than heating. Our results show that, when the temperature exceeds 1100°C, the heating rate of Co compact slows down and displays slight fluctuations. Porosity of the compacts is shown to have little effect on the heating rate. Further, the special microstructure (overall even and local uneven) of the microwave-prepared WC-8Co alloy is discussed. Besides, the relationships between the microstructure and the mechanical properties of microwave-prepared WC-8Co are explored. © 2012 Elsevier Ltd.


Tao D.-P.,Kunming University of Science and Technology
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2014

To carry out thermodynamic calculation of removing P, Ti, and V from liquid iron, their activity data are indispensable. The molecular interaction volume model (MIVM) was used to predict them. Its effectiveness and reliability in the Fe-Cr-P and Fe-Mn-P alloys were verified by comparing the predicted values of activity of all components with their experimental data. All component activities in the Fe-Ti-P, Fe-V-P, Cr-Mn-P, and Fe-Ti-V liquid alloys were predicted. Their thermodynamic behavior showed some interesting tendencies from the predicted iso-activity curves in the ternary alloys. The results indicated that the MIVM was superior to the unified interaction parameter formalism (UIPF) and might replace the Wagner interaction parameter formalism (WIPF) or the Wagner consistent formalism (WCF) theoretically because it is of clearer physical meaning and its extrapolation is more credible. © 2014, The Minerals, Metals & Materials Society and ASM International.


Wang Y.,Kunming University of Science and Technology | Wang Y.,CAS Institute of Semiconductors | Zhang X.,CAS Institute of Semiconductors | Chen N.,North China Electrical Power University
Renewable Energy | Year: 2012

Electricity generation from thermal irradiation governed by GaSb diode has been systematically investigated in its normal and inverted configuration. It is demonstrated here that there is a critical base doping, 3 × 10 17 cm -3, for the normal structure, and the superior output performance of p +/n structure with low base-doping would completely be switched to the n +/p structure when base doping larger than this critical one. Moreover, a spectrum-independent optimal doping concentration, N a = 1.5 × 10 17 cm -3, is also observed for n +/p structure, and no doping-dependent thickness compensation between emitter and base layer can be observed for the inverted structure. To save the material consumption and device cost, the reasonable active layer can be constructed by 100-200 nm emitter and 5-7 μm base, offering the useful guideline to fabricate the GaSb cell on the economical but lattice-mismatched hetero-substrate. © 2012 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.


Hu J.,Chinese Academy of Sciences | Zhang C.,Chinese Academy of Sciences | Jiang L.,Kunming University of Science and Technology | Fang S.,Chinese Academy of Sciences | And 3 more authors.
Journal of Power Sources | Year: 2014

A novel plasma graft-polymerization approach is adopted to prepare hydroxide exchange membranes (HEMs) using cardo polyetherketone powders (PEK-C) and vinylbenzyl chloride. The benzylic chloromethyl groups can be successfully introduced into the PEK-C polymer matrix via plasma graft-polymerization. This approach enables a well preservation in the structure of functional groups and formation of a highly cross-linked structure in the membrane, leading to an improvement on the stability and performance of HEMs. The chemical stabilities, including alkaline and oxidative stability, are evaluated under severe conditions by measuring hydroxide conductivity and weight changes during aging. The obtained PGP-NOH membrane retains 86% of the initial hydroxide conductivity in 6 mol L-1 KOH solution at 60 C for 120 h, and 94% of the initial weight in 3 wt% H2O2 solution at 60 C for 262 h. The PGP-NOH membrane also possesses excellent thermal stability (safely used below 120 C), alcohol resistance (ethanol permeability of 6.6 × 10-11 m2 s-1 and diffusion coefficient of 3.7 × 10 -13 m2 s-1), and an acceptable hydroxide conductivity (8.3 mS cm-1 at 20 C in deionized water), suggesting a good candidate of PGP-NOH membrane for HEMFC applications. © 2013 Elsevier B.V. All rights reserved.


Chen L.-W.,Anhui University of Science and Technology | Zhang R.-Y.,Anhui University of Science and Technology | Ma W.-G.,Anhui University of Science and Technology | Li W.-H.,Anhui University of Science and Technology | And 2 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

We investigate the di-Higgs events through ZH-pair production at the CERN Large Hadron Collider including the pure next-to-leading order (NLO) QCD correction and the gg-fusion contribution in the framework of the littlest Higgs model with T parity. We employ the diagram subtraction scheme in the QCD NLO calculations to avoid double counting and keep the convergence of the perturbative QCD description for the ZH-pair production. We investigate the dependence of the leading order and QCD corrected integrated cross sections on the renormalization/factorization scale, and find that the total QCD corrections slightly reduce the scale uncertainty in the plotted range. By considering the subsequent decays of the intermediately produced ZH bosons and adopting the exclusive four-b-jet event selection criterion, the QCD correction provides considerable enhancement of the kinematic distributions for final decay products. We find that it is possible to select the signature of the ZH-pair production from possible standard model background by taking proper kinematic cuts. © 2014 American Physical Society.


Cai D.,South China University of Technology | Wang S.,South China University of Technology | Ding L.,South China University of Technology | Lian P.,Kunming University of Science and Technology | And 3 more authors.
Journal of Power Sources | Year: 2014

Graphene nanosheets are synthesized by a novel facile method involving freeze-drying technology and thermal reduction. The microstructure and morphologies are characterized by X-ray diffraction, Brunauer-Emmett-Teller measurements, Fourier transform infrared spectroscopy, and high resolution transmission electron microscope. The results indicate that graphene nanosheets with high specific surface area (358.3 m2 g-1) and increased interlayer distance (0.385 nm) are successfully obtained through the freeze-drying process. The electrochemical performances are evaluated by using coin-type cells versus lithium. A high initial reversible capacity of 1132.9 mAh g-1 is obtained at a current density of 100 mA g-1. More importantly, even after 300 cycles at a high current density of 1000 mA g -1, a stable specific capacity of 556.9 mAh g-1 can be achieved, suggesting the graphene nanosheets exhibit superior cycle stability. The fascinating electrochemical performance could be ascribed to the high specific surface area and the increased layer distance between the graphene nanosheets. © 2014 Elsevier B.V. All rights reserved.


Zhang G.,Harbin Institute of Technology | Shu H.,Kunming University of Science and Technology | Yu J.,Harbin Institute of Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

Reliable detection and identification of the second surge is the key factor of single-ended travelling fault location. The wavefront of initial current travelling wave represents line feature through analyzing massive observed field data. Multiple-line connection configuration determines the polarity differ between reflection from fault point and reflection of remote busbar, and also determines the low amplitude of disturbance caused by reflection from end of the healthy neighbouring lines, which provides convenience for correctly capturing reflection from fault point. From the perspective of digital image processing, displaying observed travelling wave data into digital waveform image, demarcation method for travelling wave based on line detection by Hough transform is proposed, which can eliminate disturbance caused by reflection of healthy neighbouring lines and remote busbar through the amplitude and slope of surges. The confidence of wavefront identification can be determined through the interval of series fault reflected surges and the consistency of the initial wavefront slopes in different scope, which avoids mistakes caused by irrational experienced scope. The proposed method is confirmed correct and effective by massive measured field travelling wave data. © 2013 Chinese Society for Electrical Engineering.


Liu H.,Kunming University of Science and Technology | Huang Q.,University of Arkansas
Ecological Economics | Year: 2013

This paper examines the use and continued use of contour cultivation in Yunnan Province. Descriptive analysis shows that even with easy-to-adopt conservation practices such as contour cultivation, we do not observe high rates of adoption without subsidy or monetary incentives. Multivariate analysis shows that households with larger plots, more fertile land and male and younger decision makers are more likely to use contour cultivation. Households relying more heavily on agricultural income tend to continue to use contour cultivation. The findings suggest that the trends in China's agriculture sector (increasing off-farm employment, aging and more female farmers on farm) are not conducive to the use of soil conservation practices. To alleviate soil erosion problems, the government should increase investment in agricultural extension and provide farmers with monetary incentives to encourage the adoption of environmental conservation measures. Policies should also target marginal land where conservation efforts may be lacking. © 2013 Elsevier B.V.


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.


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.


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.


Wu G.Y.,Yunnan University | Dai Y.N.,Kunming University of Science and Technology
Materials Technology | Year: 2012

The Al filming of steel using the disproportionation of Al subsulphide was studied. Chemical vapour deposition was realised using (2Al 2O 3z6CzAl2S3) or (4AlzAl 2S 3) as reaction mixture at 1100°C and pressure of 5 Pa. It is indicated that the coating formed by evaporation of (2Al 2O 3z6CzAl2S3) consists of α-Fe and Al13Fe4, possesses thin diffusion layer and dark rough surface and is resistant to solution of nitric acid with alcohol, but the coating formed by evaporation of (4AlzAl 2S 3) consists of Fe 3Al and AlFe and possesses thick diffusion layer and bright smooth surface. © 2012 W. S. Maney & Son Ltd.


Gao J.,Kunming University of Science and Technology
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2014

To study the influence of twist beam suspension bushing mounting angle on suspension K&C characteristics and handling, and investigate inherent relationship between suspension characteristics and full vehicle handling variety which is caused by bushing mounting angle, at same time realize better full vehicle handling performance, a rigid-flex model of twist beam suspension is built. The influence of bushing mounting angle concerning whole design space on suspension K&C characteristics is analyzed explicitly. Nonlinear relationship curves between K&C characteristics and mounting angle are gained. Mapping problems between suspension key characteristics index on wheel travel and lateral force condition and bushing mounting angle are solved. Based on the above suspension analysis, nonlinear relationship curves between handling index and bushing mounting angle are obtained. Comparing the nonlinear relationship curves with K&C analysis curves shows that the influence of mounting angle on handling is obviously relevant with suspension K&C. At last, handling index is taken as optimization object, and collaborative optimization on mounting angle and handling index is carried out with NSGA-II multi-objective optimization algorithm. Results show vehicles have better handling performance.


Shi Y.-X.,CAS Xishuangbanna Tropical Botanical Garden | Shi Y.-X.,University of Chinese Academy of Sciences | Xu Y.-K.,CAS Xishuangbanna Tropical Botanical Garden | Hu H.-B.,CAS Xishuangbanna Tropical Botanical Garden | And 2 more authors.
Food Chemistry | Year: 2011

The young leaves of seven Ficus species including F. virens var. sublanceolata, F. auriculata, F. vasculosa, F. callosa, F. virens var. verins, F. racemosa and F. oligodon are traditionally consumed by local people in Xishuangbanna. The dry young leaves were studied for their total phenolic and flavonoid contents. The 90% ethanolic extracts of the young leaves were screened for potential antioxidant capacity by employing different in vitro assays including ABTS+ and DPPH radical scavenging capacities, ferric reducing power and lipid peroxidation inhibition properties. Extracts from F. virens var. sublanceolata and F. auriculata showed higher antioxidant activity in all the systems than other species. We concluded that these two species are promising sources of natural dietary antioxidants. According to our statistical analysis, the total phenolic and flavonoid contents appear to be responsible, at least in part, for the extracts' excellent antioxidant capacity and all the extracts exhibited dose-dependent antioxidant activity. © 2011 Elsevier Ltd. All rights reserved.


Xu G.,Nanjing Southeast University | Gao C.,Kunming University of Science and Technology | Gou S.,Nanjing Southeast University | Cao Z.,Nanjing Southeast University
ChemMedChem | Year: 2012

Six dicarboxylato-bridged dinuclear platinum(II) complexes S1-S6, with a newly designed chiral ligand, 2-{[(1R,2R)-2-aminocyclohexyl]amino}propanoic acid (HL), were prepared and spectrally characterized. The invitro cytotoxicity of all resulting platinum(II) complexes was evaluated against human HCT-116, MCF-7, and HepG-2 tumor cell lines. The results show that all compounds exhibit positive biological activity toward HCT-116 and MCF-7 cell lines, of which complexes S3, S4, and S5, with succinate and its derivatives as bridges, showing better activity than the positive controls. Moreover, double-dyeing flow cytometric resection experiments indicate that the target compounds inhibit tumor cell growth by inducing apoptosis; gel electrophoresis experiments demonstrate the compounds' ability to prompt pET22b plasmid DNA degradation in almost the same way as oxaliplatin. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Xu Y.,Kunming University of Science and Technology | Guo X.,Harbin Institute of Technology | Hao J.,City University of Hong Kong | Ma J.,City University of Hong Kong | And 2 more authors.
Decision Support Systems | Year: 2012

The rapid proliferation of information technologies especially Web 2.0 techniques has changed the fundamental ways how things can be done in many areas, including how researchers could communicate and collaborate with each other. The presence of the sheer volume of researchers and research information on the Web has led to the problem of information overload. There is a pressing need to develop researcher recommendation agents such that users can be provided with personalized recommendations of the researchers they can potentially collaborate with for mutual research benefits. In academic contexts, recommending suitable research partners to researchers can facilitate knowledge discovery and exchange, and ultimately improve the research productivity of researchers. Existing expertise recommendation research usually investigates the expert recommending problem from two independent dimensions, namely, their social relations and expertise information. The main contribution of this paper is that we propose a network based researcher recommendation approach which combines social network analysis and semantic concept analysis in a unified framework to improve the effectiveness of personalized researcher recommendation. The results of our experiment show that the proposed approach significantly outperforms the other baseline methods. Moreover, how our proposed framework can be applied to the real-world academic contexts is explained based on a case study. © 2012 Elsevier B.V. All rights reserved.


Duan W.-L.,Kunming University of Science and Technology
Indian Journal of Physics | Year: 2015

Intracellular calcium oscillation with colored noises and same time delay τ in active and passive transport processes of intracellular Ca2+ is investigated by the means of second-order algorithm for stochastic simulation colored noises. By simulating time series, stationary probability distribution and average of intracellular Ca2+ concentrations, we obtain the results which indicate that is anti-synchronous between calcium store and cytosol and the critical phenomenon of time delay with critical value (Formula presented.), appears. As τ→ 0.1 s or as correlation time τ1 of colored noises increases, the stability of system is strengthened. Especially, the long τ and τ1 induce periodically square calcium wave. Additionally, as τ1 prolongs, the average of Ca2+ concentrations of cytosol and calcium store respectively always increases and maintains a constant value. © 2014, Indian Association for the Cultivation of Science.


Lu S.,Kunming University of Science and Technology
Wei sheng wu xue bao = Acta microbiologica Sinica | Year: 2011

To improve the tolerance of main metabolites, we used genome shuffling to achieve high 1,3-propanediol producing mutants. Based on 96 deep-well palates containing prepared ended fed-batch broth as an efficient selection method, genome shuffling has been applied in strain improvement. Five high producers were obtained after genome shuffling (LSG1, LSG2, LSG4, LSG5 and LSG6). During batch fermentation (3 L), the 1, 3-propanediol production of the five mutants were improved 17.0%, 19.0%, 12.9%, 23.9% and 18.0% , compared with the parent strain; the conservations from glycerol were improved 17.7%, 20.0%, 13.3%, 24.4% and 17.7%. Genome shuffling was an efficient approach for strain improvement, and 96 deep-well palates containing fed-batch broth has been demonstrated as an efficient selection approach.


Wang W.,Kunming University of Science and Technology | Wang Q.,Xian University of Technology | Wang Q.,CAS Institute of Soil and Water Conservation
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

This article attempts to analyze the impacts of sampling extent and sampling spacing on soil air permeability's spatial variability, and preliminary discuss the scale-dependency. The spatial variation of parameters in Linze County, an agricultural area in the middle reaches of Heihe River Basin, was examined. A study in a 21 m ×21 m of wheat zone was carried out, and the spatial variation of soil air permeability was analyzed with all the data measured under 3 m×3 m sampling grid. Then, re-sampling technique was employed with including coefficient of variation, correlation length and Moran's I index were applied to each scenario to characterize the degree of spatial variability of soil air permeability. The results showed that all measured indices increased with various degrees with increasing extent. However, the spacing did not affect coefficient of variation and Moran's I index, while correlation length decreased with the increase of the spacing.


Jin X.,Beijing Forestry University | Jin X.,Kunming University of Science and Technology | Fu J.,Beijing Forestry University | Dai S.,Beijing Forestry University | And 2 more authors.
Scientia Horticulturae | Year: 2013

Cineraria (Senecio cruentus Masson ex L'Herit) is a groundsel perennial herbaceous plant that has a variety of colors and is an ideal model used to research the mechanism of flower color variation. Anthocyanin is the major component that determines the flower color, and studying the regulation of endogenous anthocyanin biosynthesis-related genes is important for understanding the molecular mechanism of flower color variation. Selecting suitable reference genes is a prerequisite for identifying the accurate expression pattern of these genes. We analyzed the stability of eight reference genes, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), protein phosphatase 2A (PP2A), β-tubulin, Actin, TIP41-like family protein (TIP41), elongation factor 1. α (EF-1α), SAND family protein (SAND) and S-adenosylmethionine synthetase (SAMS) in different flower developmental stages of four different color lines in cineraria. The results showed that SAND and Actin were the most stable genes in the blue and pink lines, while the TIP41 and Actin genes performed best in the white line; however, the PP2A and Actin genes were the least variable in the carmine line. SAND and Actin genes were the most stable gene in all samples. SAMS was the least stable gene in all samples, so it is not suitable as a reference gene. In addition, the relative expression level of Senecio cruentus Flavanone 3-hydroxylase gene (ScF3H), the upstream gene in the anthocyanin biosynthesis pathway, in the different developmental stages of the flower in the carmine line was analyzed to verify the reference genes selected in this study. We recommended the combination of SAND, Actin and PP2A were suitable for normalization the target genes in different color lines of cineraria during their flower developmental stages. This study presented the first systematic study of reference genes stability and provided a guide to research of the molecular mechanism of the anthocyanin biosynthesis pathway and flower development in cineraria. © 2013 Elsevier B.V..


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.


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.


Zhang R.,Kunming University of Science and Technology
Measurement Science and Technology | Year: 2016

The digital gradient sensing method is used for measuring small angular deflections of light rays due to local stresses in transparent planar solids. The method is based on two-dimensional (2D) digital image correlation (DIC) to measure the angular deflection of light rays; however, when a specimen is subjected to loading, deformation measurement from DIC is not perfect because of the existence of small in-plane and out-of-plane motions of the test sample surface that occurred after loading. These disadvantages will lead to errors in the measured angular deflections. The influence of unavoidable in-plane and out-of-plane motions was discussed, and a method to eliminate the influence to show the pure stress gradient of polymethy methacrylate is demonstrated. © 2016 IOP Publishing Ltd.


He X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2012

The aim of this paper is to investigate the effect of supports on the actual stress distribution of the single-lap adhesive joints under tension using the three-dimensional finite element methods. Five layers of elements were used across the adhesive thickness in order to obtain an accurate indication of the variation of stresses. All the numerical results obtained from the finite element analysis show that the spatial distribution of all components of stress are similar for different interfaces though the stress values are obviously different. The results also show that most of the maximum stresses occur at the interface 1. It can be seen from the results that the stresses are concentrated near the left free ends of the adhesive layer while the centre region of the adhesive layer is mostly stress-free. © (2012) Trans Tech Publications, Switzerland.


Li Y.M.,Kunming University of Science and Technology
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2011

To research the effects of Na-FA on gastrointestinal movement and gastriculcer in mice. Using charcoal powder as an indicator, the effects of FA-Na on bowel movement of mice was evaluated by determining the propulsive percent-age of charcoal powder in normal mice, inhibition of small intestinal propulsion model induced by Compound Diphenoxylate and spleen asthenia and diarrhea model caused by Rheum officinale Baill; The acute gastric ulcer model was induced by intragastric alcohol given orally, the protective effect of FA-Na given ahead on gastric injury was evaluated, the ulcer index and the inhibition ratio of ulcer was calculated. FA-Na (intragastric administration) had inhibit effect on normal mice and diarrhea model caused by Rheum officinale, significantly synergetic effect on gastrointestinal asynersis induced by Compound Diphenoxylate, and protective effect on mice gastric mucosal injury cause by dehydrated alcohol. Compared with the positive control drug Ranitidine, the ulcer index and ulcer inhibition ratio large doses of FA-Na had no significant difference. The acute toxicity of FA-Na is very low, it has the effects of antidiarrheal and anti-gastric ulcer.


Wang C.,Kunming University of Science and Technology
Nonlinear Dynamics | Year: 2015

In this paper, we extend the recent work of Liu and his collaborators for the (2+1)-dimensional KdV equation. The lump solution under the small perturbation of parameter which decays to the background plane wave in all directions in the plane is obtained. This solution is analogous to the lump solution of the KP equation, but there are some novel different features. The deformation between and among bright, bright-dark and dark lump solution is investigated and exhibited mathematically and graphically. We also discuss that the deflection of lump solution not only depends on the perturbation parameter (Formula presented.), but also has a relationship with the other parameters. These interesting nonlinear phenomena might provide us with useful information on the dynamics of the relevant fields in nonlinear science. © 2015 Springer Science+Business Media Dordrecht


He X.,Kunming University of Science and Technology
Key Engineering Materials | Year: 2011

This paper deals with the effects of bending and boundary condition on the stress distribution of a single-lap adhesive joint under tension using the three-dimensional finite element analysis technique. The numerical results obtained from the finite element analysis show that both the left and right hand regions of the adhesive layer are subjected to high stresses. The numerical results also show that most of the extreme stresses occur at interface which is between the adhesive and the upper adherend. It is clear that the stresses are concentrated near the left and right free ends of the adhesive layer while the centre region of the adhesive layer is mostly stress-free. It is also clear that the stress state in this case is mainly dominated by the normal stress components. © (2011) Trans Tech Publications.


Shen C.,Yunnan University | Shen C.,Kunming University of Science and Technology | Pratt B.R.,University of Saskatchewan | Zhang X.-G.,Yunnan University
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2014

Minute phosphatized coprolites have been recovered from the middle Cambrian (Stage 5) Gaotai Formation in Duyun, Guizhou, southern China. They occur as ellipsoidal, rod-like and coiled or sinusoidal objects that can be classified into four morphotypes. Three of these consist of finely crystalline ('amorphous') apatite that replaced digested organic matter and possibly muddy sediment, while a fourth is composed of bioclasts belonging to the prey animals of either palaeoscolecid dermal sclerites, bradoriid carapaces or lingulate brachiopod valves. Pellets occur in elongate clusters of up to about 100 ellipsoids. These clusters indicate that the producers' digestive systems were able to compress ingested material into individual pellets which were then expelled en masse without being shaped by muscle contractions in the latter portion of the intestine and anus. On the other hand, rod-like faeces with irregular annular grooves indicate a process of extrusion of digested material involving strong muscle contraction and compaction. Rods packed with sclerites and valves indicate that these hard parts are undigested organism fragments. Sinusoidal faeces point to ingestion of a great deal of material before extrusion, and possibly accompanied by movement of the anus-bearing posterior. The coiled morphotype suggests defecation of loosely compacted material from a long animal with a correspondingly long gut. Pellet clusters were produced by either a suspension feeder or a deposit feeder. Two or more types of invertebrates consumed organic matter and possibly lime mud, probably as deposit-feeders, while at least one other preyed upon worms, bradoriids and/or brachiopods. The different shapes and contents of these uniquely preserved coprolites confirm that the middle Cambrian benthic community exhibited a complex trophic structure involving a wide array of nutritional behaviours, including predator-prey and scavenger relationships, possibly along with prey selectivity in the context of prey life cycles. © 2014 Elsevier B.V.


Zhang X.,Xian Jiaotong University | Mei C.,Xian Jiaotong University | Chen D.,North China Electrical Power University | Li J.,Kunming University of Science and Technology
Knowledge-Based Systems | Year: 2013

Rule acquisition is one of the most concerned issues in the study of decision systems including covering decision systems. Usually, a covering decision system is inconsistent, which can lead to the result that some of the rules derived from the system are not certain but possible rules. Considering the fact that, in addition to the certain rules, the possible rules with high confidence are also commonly used in practice for making decision, and the compact rules without redundant conditional attributes can conveniently be used by a decision maker, we propose in this study a rule confidence preserving attribute reduction approach in order to extract from a covering decision system both the compact certain rules and the compact possible rules with their confidence degree being not less than a pre-specified threshold value. Furthermore, a combinatorial optimization algorithm is formulated to compute all the reducts. Some numerical experiments are further conducted to evaluate the performance of the proposed reduction method. © 2013 Elsevier B.V. All rights reserved.


Li S.,Kunming University of Science and Technology | Mi C.C.,University of Michigan
IEEE Journal of Emerging and Selected Topics in Power Electronics | Year: 2015

Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires. In fact, the WPT adopts the same basic theory which has already been developed for at least 30 years with the term inductive power transfer. WPT technology is developing rapidly in recent years. At kilowatts power level, the transfer distance increases from several millimeters to several hundred millimeters with a grid to load efficiency above 90%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper reviewed the technologies in the WPT area applicable to EV wireless charging. By introducing WPT in EVs, the obstacles of charging time, range, and cost can be easily mitigated. Battery technology is no longer relevant in the mass market penetration of EVs. It is hoped that researchers could be encouraged by the state-of-the-art achievements, and push forward the further development of WPT as well as the expansion of EV. © 2014 IEEE.


Xie H.-T.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

Taking portal segment in some shallow-buried tunnel in seismic region with strong motion as objects of study, the finite element analysis method was used to compare and assess the seismic behavior of the tunnel with different cross section shape. The results show that the lining's displacement response of the tunnel with different cross section shape differs very minor under seismic load. Meanwhile there exists obvious difference in the lining internal forces of the tunnel with different cross section shape. Among all the tunnel with different section shape, the mechanics situation of the tunnel with triple arched sections is the best. While the section of the tunnel is closer to circular in shape, the mechanics situation of the lining can be effectively improved under seismic load. © (2013) Trans Tech Publications, Switzerland.


Zou Y.,Kunming University of Science and Technology | Li F.,Zhengzhou University | Hou W.,University of Pittsburgh | Sampath P.,University of Pittsburgh | And 2 more authors.
British journal of cancer | Year: 2014

Cytokine-induced killer (CIK) cells are ex vivo-expanded immune cells that express NK-cell and T-cell markers and that are routinely used in the treatment of many cancers. One key advantage of CIK cells is their ability to efficiently traffic to many solid tumours. Although likely to be mediated by chemokine receptor (CKR) expression, a thorough examination of the mechanism of tumour targeting has not been previously explored. Here, human CIK cell expansions were examined for the level, profile and kinetics of CKR expression. It was found that CIK cells express a panel of CKRs, with considerable variation between donors. Importantly, CKR levels dropped considerably beyond 14 days in culture, being significantly reduced by day 28 (the time at which cytolytic activity peaked). As such, CIK preparations that are used clinically may not have optimal CKR expression. Several approaches were found to re-stimulate CKR cell-surface levels at these later time points. These approaches also enhanced cytolytic activity in vitro and were demonstrated to increase both in vivo tumour trafficking and anti-tumour activity in mouse models. Simple modifications of the CIK expansion protocol could therefore be used to significantly enhance the anti-tumour effects of this therapy.


Yu F.-C.,Yunnan University | Yu F.-C.,Kunming University of Science and Technology | Chen Z.-Q.,Yunnan University | Hao X.-P.,Yunnan University | And 3 more authors.
RSC Advances | Year: 2014

A method for regioselective synthesis of 9,10-dihydro-6H-chromeno[4,3-d] imidazo[1,2-a]pyridin-6-one derivatives has been developed. The reaction was readily performed by reacting inexpensive materials, 4-chloro-3-formylcoumarin and HKAs, in EtOH catalyzed by Et3N. This protocol has many advantages including convenient operation, short reaction times, green solvent, and simple purification by washing the crude products with 95% EtOH, defined as GAP (Group-Assistant-Purification) chemistry. The library of 9,10-dihydro-6H-chromeno[4,3-d]imidazo[1,2-a]pyridin-6-one derivatives has been constructed with excellent yields. © 2014 The Royal Society of Chemistry.


Yin X.-G.,Southwest Jiaotong University | Song L.-L.,Southwest Jiaotong University | You Z.,Southwest Jiaotong University | Zhu Z.-Z.,Kunming University of Science and Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

An accurate fault locating method based on existing double-terminal traveling waves fault location principle is presented, which avoids the influence of traveling wave speed. This method uses wavelet transform to analyze traveling wave signals and determine the arrival time of the fault initial traveling waves and the reflected wave from the point of failure reaching both ends of bus bar. Then a group of equations involving distance, time and velocity is solved and the fault location formula unrelated to wave speed is obtained. In theory this method avoids the wave speed influence, and has high accuracy in fault location. The Matlab software simulative results prove its validity and correctness.


Na J.,Kunming University of Science and Technology | Mahyuddin M.N.,University of Bristol | Herrmann G.,University of Bristol | Ren X.,Beijing Institute of Technology | Barber P.,Land Rover Cars Ltd
International Journal of Robust and Nonlinear Control | Year: 2015

Summary This paper studies adaptive parameter estimation and control for nonlinear robotic systems based on parameter estimation errors. A framework to obtain an expression of the parameter estimation error is proposed first by introducing a set of auxiliary filtered variables. Then three novel adaptive laws driven by the estimation error are presented, where exponential error convergence is proved under the conventional persistent excitation (PE) condition; the direct measurement of the time derivatives of the system states are avoided. The adaptive laws are modified via a sliding mode technique to achieve finite-time convergence, and an online verification of the alternative PE condition is introduced. Leakage terms, functions of the estimation error, are incorporated into the adaptation laws to avoid windup of the adaptation algorithms. The adaptive algorithm applied to robotic systems permits that tracking control and exact parameter estimation are achieved simultaneously in finite time using a terminal sliding mode (TSM) control law. In this case, the PE condition can be replaced with a sufficient richness requirement of the command signals and thus is verifiable a priori. The potential singularity problem encountered in TSM controls is remedied by introducing a two-phase control procedure. The robustness of the proposed methods against disturbances is investigated. Simulations based on the 'Bristol-Elumotion-Robotic-Torso II' (BERT II) are provided to validate the efficacy of the introduced methods. © 2014 John Wiley and Sons, Ltd.


Ji Y.,Kunming University of Science and Technology
Future Information Engineering and Manufacturing Science - Proceedings of the 2014 International Conference on Future Information Engineering and Manufacturing Science, FIEMS 2014 | Year: 2015

In this work, the effects of the Ban for Free Plastic Bags in different social regions were analyzed to provide thoughts and analysis for its implementation. Analyses on the nature of the ban— environmental behavior and its implementation in farmers’ markets and supermarkets—show the following results. The enforcement of the ban is good in supermarkets but inferior in farmers’ markets. Because the present Ban for Free Plastic Bags is inadequate without any comprehensive alternatives. The innovation here is to conduct detailed analyses from different regions. The work also carried out multi-level analyses on phenomena based on the causes from subjective and objective bodies. © 2015 Taylor & Francis Group, London.


Yang X.,Kunming University of Science and Technology
International Journal of Vehicle Design | Year: 2013

A novel control scheme is proposed to improve the vehicle stability by coordinating the slips of the two wheels on the same side simultaneously. This scheme is a three-level structure that includes the first level of yaw moment controller, the second level of brake force distributor and the third level of wheel slip regulator. Brake force distributor distributes the desired brake forces to the two wheels on the same side properly and the wheel slip regulator is designed to track the desired slips from the brake force distributor. Simulation results of the proposed control scheme are rather satisfying. Copyright © 2013 Inderscience Enterprises Ltd.


Tao D.,Kunming University of Science and Technology
Acta Metallurgica Sinica (English Letters) | Year: 2011

The molecular interaction vacancy model (MIVM) is used to estimate simultaneously activities of all components in a range of entire composition of six binary oxide solid solutions and the MnO-FeO-CaO ternary solid solution by their binary infinite dilute activity coefficients. The average errors are the 0.03%-5.0% for the binaries and the 4.11%-25.2% for the ternary which is less than that (4.84%-41.2%) of the sub-regular solution model (SRSM). This shows that MIVM is more effective and reliable than SRSM for the ternary and does not depend on a polynomial approximation with some ternary adjustable parameters.


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.


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

Combining the caustic method with high-speed photography is an efficient optical measurement technique to study the dynamic fracture behaviours of homogenous and isotropic material. In the last decade, the main emphasis is extended to study dynamic fracture of anisotropic material and dynamic propagation of multi-cracks and interface cracks in practical engineering materials. In this paper, the recent advances and applications about the dynamic caustic method in China are reviewed, such as impact response and dynamic fracture of composite materials (fibre composites, functionally gradient materials and nanometre composites), and dynamic interaction and propagation of multi-cracks and interface cracks. Particularly, some new numerical methods were developed to solve the complicated caustic equations by introducing both the maximum characteristic size and the relevant angles in caustic patterns. Also, some important experimental results in fracture mechanics are described, and the potential research prospects about dynamic caustics are included as well. © 2011 Blackwell Publishing Ltd.


He X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2012

This paper deals with forced vibration behavior of adhesively bonded single-lap joint theoretically and experimentally. The finite element analysis (FEA) software was used to predict the natural frequencies and frequency response functions (FRFs) of the joint. The dynamic test software and the data acquisition hardware were used in experimental measurement of the dynamic response of the joint. It is shown that the natural frequencies of the joint from experiment are lower than those predicted using finite element analysis. It is also found that the measued FRFs are close to the predicted FRFs for the first two modes of vibration of the joint. Above the second mode of vibration, there is considerable discrepancy between the measured and predicted FRFs. © (2012) Trans Tech Publications, Switzerland.


Yin J.,Kochi University of Technology | Yin J.,Kunming University of Science and Technology | Ren X.,Kochi University of Technology
International Journal of Innovative Computing, Information and Control | Year: 2010

This paper presents a novel Chinese calligraphy and painting system, which serves as an expressive vehicle for interactively creating Chinese traditional calligraphy and ink-wash painting works. We developed a brush model which gives the user natural control of complex brush strokes. This model enhances the realistic sense of the user's manipulating the pen with the pressure sense. We also develop an ink-wash painting model which simulates Tuiyun - a unique Chinese ink-wash painting technique. User feedback has shown that the system is able to create vivid art works easily and smoothly. © 2010 ICIC International.


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.


Zhang H.,West Virginia University | Zhan Z.,West Virginia University | Zhan Z.,Kunming University of Science and Technology | Liu X.,West Virginia University
Journal of Power Sources | Year: 2011

We discuss here our attempt to develop (Mn,Co)3O4 spinel coatings on the surface of Cr-containing steel through electrophoretic deposition (EPD) followed by reduced-atmosphere sintering for solid oxide fuel cell (SOFC) interconnect application. The effects of EPD voltages and sintering atmospheres on the microstructure, electrical conductivity and long-term stability of the coated interconnects are examined by means of scanning electron microscopy (SEM), energy dispersion spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), and four-probe resistance techniques. For the spinel coatings generated using smaller voltage than 400 V, the interconnect surfaces exhibit good packing behavior and high conductivity. The reduced atmosphere during sintering has a beneficial impact on the minimizing chromia subscale formation and thus reducing the area specific resistance (ASR) of the coated interconnects. Moreover, it is interesting to note that a more stable long-term performance is achieved for the spinel coating sintered in H2/H 2O atmosphere with thin chromia sub-scale and no Cr penetration. Based on the current results, EPD followed by reduced-atmosphere sintering is a fast and economic way to deposit (Mn,Co)3O4 coating for SOFC interconnect applications. © 2011 Elsevier B.V.


Zhao Z.,Nanjing University | Zhao Z.,Kunming University of Science and Technology | Li Z.,Nanjing University | Zou Z.,Nanjing University
ChemPhysChem | Year: 2012

The energetic and electronic properties of N/V-doped and N-V-codoped anatase TiO2 (101) surfaces are investigated by first-principles calculations, with the aim to elucidate the relationship between the electronic structure and the photocatalytic performance of N-V-codoped TiO2. Several substitutional and interstitial configurations for the N and/or V impurities in the bulk phase and on the surface are studied, and the relative stability of different doping configurations is compared by the impurity formation energy. Systematic calculations reveal that N and V impurities can be encapsulated by TiO2 to form stable structures as a result of strong N-V interactions both in the bulk and the surface model. Through analyzing and comparing the electronic structures of different doping systems, the synergistic doping effects are discussed in detail. Based on these discussions, we suggest that NOVTi codoping cannot only narrow the band gap of anatase TiO2, but also forms impurity states, which are propitious for the separation of photoexcited electron-hole pairs. In the case of N OVTi-codoped TiO2 (101) surfaces, this phenomenon is especially prominent. Finally, a feasible synthesis route for NOVTi codoping into anatase TiO2 is proposed. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Dai J.,Kunming University of Science and Technology | Meng W.,Chongqing University
International Journal of Production Economics | Year: 2015

In this paper we analyze a single-period inventory model where a risk-averse newsvendor makes a joint decision on ordering, pricing and marketing under the CVaR risk measure criterion. The newsvendor can exert marketing effort to enhance market demand. We assume that the newsvendor's marketing effort affects the scale of the demand distribution and hence to model the marketing-dependent demand as a multiplicative form. We characterize sufficient conditions that guarantee existence and uniqueness of the optimal solutions under some mild assumptions on demand distribution, expected demand function and marketing effort cost, which are widely used in the related literature. We show that the optimal order quantity increases in the newsvendor's marketing effort, but the optimal price remains unchanged whether the demand is marketing-dependent or not. Additionally, we explore impact of exogenous parameters, such as unit order cost, salvage value and the newsvendor's risk aversion coefficient, on the optimal decision variables, and find that the optimal marketing effort always keeps the same changing direction with the optimal marketing-independent order quantity as the exogenous parameters change. This suggests that impact of the parameters on the optimal order quantity gets strengthened in the case of marketing-dependent demand. © 2014 Elsevier B.V. All rights reserved.


Chen Z.,Nanjing University | Chen Z.,Kunming University of Science and Technology | Li G.,Nanjing University
Earth and Planetary Science Letters | Year: 2013

The thick deposits of eolian dust on the Chinese Loess Plateau provide a rare opportunity to explore the past changes of surface processes in response to climatic and tectonic oscillations. Here we report a 22Ma-long Nd and Sr isotopic records of the eolian sources. Decreasing εNd values and increasing 86Sr/87Sr ratios of the eolian deposits has been observed from early Miocene to about 7Ma, which indicates growing material contribution from Qilian Mountains relative to the Gobi Altay Mountains. The source shift during 22-7Ma is interpreted to reflect the erosional response of the Qilian Mountains to its surface uplift. Between 7Ma and 1.2Ma, the results show relative constant Nd and Sr isotopic compositions of the eolian deposits, and thus suggest a constant source contribution between Qilian Mountains and Gobi Altay Mountains. Synchronized uplift of the two mountain ranges during this period may explain the constant ratio of source contribution. Since 1.2Ma, Nd and Sr isotopic records indicate that the relative debris input from Qilian Mountains drops rapidly. As large-scale topographic changes would not be expected in such a short time period, the source shift since 1.2Ma might be by the differing erosional responses in Qilian Mountains and Gobi Altay Mountains to the development of full glacial climate after the middle Pleistocene transition. This work shows that combined Nd and Sr isotopic signatures of the dust records are valuable proxies to monitoring past surface processes on the million years time scale. © 2013 Elsevier B.V.


He X.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2011

This paper deals with comparisons of finite element models of adhesively bonded joints. In order to increase the accuracy of the results, five layers of solid elements were used across the adhesive layer which was only 0.05 mm in thickness. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most regions of the adherends and adhesive were modelled using solid brick elements but some solid triangular prism elements were used for a smooth transition. In some of the models, linear interpolation elements of full or reduced integration and of hybrid formulation were used. In other models, quadratic interpolation elements of full or reduced integration and of hybrid formulation were used. Comparisons are performed between models with different modelling approach in order to find a suitable model to predict the mechanical behaviour of adhesively bonded joints. © (2011) Trans Tech Publications, Switzerland.


Zhou D.Q.,Kunming University of Science and Technology | Edward Grumbine R.,CAS Kunming Institute of Botany
Biological Conservation | Year: 2011

Beginning in 1956, China has built a large protected areas system, but has struggled to implement effective management. There remain ongoing problems with administrative authority, unclear regulations, inadequate funding, inappropriate development within protected areas, a dearth of professional capacity, and more. To address these concerns, since 2001, international nongovernment organizations led by The Nature Conservancy have encouraged various levels of government in China to experiment with an international model of national parks. The government in Yunnan province, the center of China's biological and cultural diversity, has acted to create a national park experimental system with new administrative bureaus, comprehensive regulations, park master plans, and several national park pilots. We review two of these pilots, Pudacuo National Park and Laojun Mountain National Park, to evaluate whether this park model, as it is being applied in Yunnan, offers an improvement to existing nature reserve regulations and implementation. Though the experiment is in its early stages, issues remain around regulatory authority, community participation, park funding and staff capacity. © 2011 Elsevier Ltd.


Zhou J.-X.,Chinese Academy of science | Huang Z.-L.,Chinese Academy of science | Gao J.-G.,Kunming University of Science and Technology | Yan Z.-F.,Chinese Academy of science
International Geology Review | Year: 2013

Located in the western Yangtze Block, the Qingshan Pb-Zn deposit, part of the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province, contains 0.3 million tonnes of 9.86 wt.% Pb and 22.27 wt.% Zn. Ore bodies are hosted in Carboniferous and Permian carbonate rocks, structurally controlled by the Weining-Shuicheng anticline and its intraformational faults. Ores composed of sphalerite, galena, pyrite, dolomite, and calcite occur as massive, brecciated, veinlets, and disseminations in dolomitic limestones. The C-O isotope compositions of hydrothermal calcite and S-Pb-Sr isotope compositions of Qingshan sulphide minerals were analysed in order to trace the sources of reduced sulphur and metals for the Pb-Zn deposit. δ13CPDB and δ 18OSMOW values of calcite range from -5.0‰ to -3.4‰ and +18.9‰ to +19.6‰, respectively, and fall in the field between mantle and marine carbonate rocks. They display a negative correlation, suggesting that CO2 in the hydrothermal fluid had a mixed origin of mantle, marine carbonate rocks, and sedimentary organic matter. δ34S values of sulphide minerals range from +10.7‰ to +19.6‰, similar to Devonian-to-Permian seawater sulphate (+20‰ to +35‰) and evaporite rocks (+23‰ to +28‰) in Carboniferous-to-Permian strata, suggesting that the reduced sulphur in hydrothermal fluids was derived from host-strata evaporites. Ores and sulphide minerals have homogeneous and low radiogenic Pb isotope compositions (206Pb/204Pb = 18.561 to 18.768, 207Pb/204Pb = 15.701 to 15.920, and 208Pb/204Pb = 38.831 to 39.641) that plot in the upper crust Pb evolution curve, and are similar to those of Devonian-to-Permian carbonate rocks. Pb isotope compositions suggest derivation of Pb metal from the host rocks. 87Sr/86Sr ratios of sphalerite range from 0.7107 to 0.7136 and (87Sr/86Sr)200Ma ratios range from 0.7099 to 0.7126, higher than Sinian-to-Permian sedimentary rocks and Permian Emeishan flood basalts, but lower than Proterozoic basement rocks. This indicates that the ore strontium has a mixture source of the older basement rocks and the younger cover sequence. C-O-S-Pb-Sr isotope compositions of the Qingshan Pb-Zn deposit indicate a mixed origin of the ore-forming fluids and metals. © 2013 Taylor & Francis.


Wu T.,Kunming University of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2012

The waste liquid, gas and residue produced in the electroplating production will do harm to the environment and the human body, so it is essential to realize automatic electroplating manufacture. The technological process of automatic electroplating manufacture and the overall arrangement of plating tanks are discussed in this paper. MITSUBISHI FX PLC is used to control the automatic electroplating reciprocate production line. PLC I/O terminals configuration, control flowchart and corresponding ladder program is discussed at the same time. Thus could improve working condition and raise working efficiency. © 2012 Springer-Verlag Berlin Heidelberg.


Ma Y.-P.,Northeastern University China | Wang S.,Kunming University of Science and Technology
Mitochondrial DNA | Year: 2015

In this study, the complete mitochondrial genome sequence of the African lion P. leo leo was reported. The total length of the mitogenome was 17,054 bp. It contained the typical mitochondrial structure, including 13 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes and 1 control region; 21 of the tRNA genes folded into typical cloverleaf secondary structure except for tRNASe. The overall composition of the mitogenome was A (32.0%), G (14.5%), C (26.5%) and T (27.0%). The new sequence will provide molecular genetic information for conservation genetics study of this important large carnivore. © 2014 © 2014 Informa UK Ltd.


Wei S.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

A central composite rotatable orthogonal experimental design of response surface methodology (RSM) was employed to find the optimum parameters combination of microhardness of electroless composite coating of Ni-P with SiC nano-particles. Microhardness of electroless composite coating was used as response function, and three parameters, namely, coating liquid temperature, PH, the concentration of SiC nano-particles were selected as influence factors. Nano-particles were dispersed using ultrasonic. The effects of every factor on response function were analyzed, and the optimum combination for three parameters were obtained, which one was 84~86 °C of coating liquid temperature, 5.3~5.7 of PH and 4.5 g/L of concentration of SiC nano-particles. The optimum result was microhardness of electroless composite coating more than 1000 HV after heat treatment. © (2013) Trans Tech Publications, Switzerland.


Li Y.,Yunnan University | Zhao K.,Yunnan University | Zhao K.,Kunming University of Science and Technology | Ye Y.,Yunnan University
Neural Processing Letters | Year: 2012

The existence of equilibrium solutions to reaction-diffusion recurrent neural networks with distributed delays and Neumann boundary conditions on time scales is proved by the topological degree theory and M-matrix method. Under some sufficient conditions, we obtain the uniqueness and global exponential stability of equilibrium solution to reaction-diffusion recurrent neural networks with distributed delays and Neumann boundary conditions on time scales by constructing suitable Lyapunov functional and inequality skills. Two examples are given to illustrate the effectiveness of our results. © Springer Science+Business Media, LLC. 2012.


Zhang M.,Kunming University of Science and Technology | Xie S.,Nanjing University of Information Science and Technology | Xie S.,Nanjing Southeast University
Journal of Computational Information Systems | Year: 2013

Localization algorithm based on the linear least square principle has the advantages of small amount of calculations, and attracts many researchers. In this paper, some algorithms based on linear least square estimation for single target localization are researched. We analyze the essence of these algorithms, give the specific estimation process and summarize the advantages and drawbacks of them. Finally, we point out the direction of such algorithms for further research. © 2013 by Binary Information Press.


Wang C.,Kunming University of Science and Technology
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Grain size changes of as-cast Mg-3Al alloy were investigated through adding Fe into melts then treated by carbon inoculation based on the native grain refinement, and influencing mechanism of Fe was also analyzed and discussed. The results reveal that the grain size in Mg-3Al alloy is increased firstly and then decreased with the increase of Fe. Grain refining efficiency of carbon inoculation is notable when the Fe content is low, while it is fade with Fe content increase. The influencing mechanisms of Fe element on grain size of Mg-3Al alloy is related with the characteristics of nucleuses in solidification induced by Fe. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


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

Since the disclosure that salen complexes were potent low-temperature oxidation catalysts with exceptional selectivity, considerable efforts by our group have focussed on their development towards the efficient catalytic delignification of pulp, principally with environmentally benign oxygenic chemicals. These efforts have resulted in additional developments including the heterogenisation of catalytic systems as well as the hydrogenation for application in catalytic delignification of pulp. Herein, heterogeneous complexes of two ligands: [H2]salen and [H4]salen with copper as a transition metal were synthesized and encapsulated in zeolite cages by the impregnation (IM) and ship-in-a-bottle (SB) method. The resulting complexes were employed as catalysts for oxidative delignification of pulp, using peracetic acid (CH3COOOH) as an oxidant. The observed trends in catalytic activity showed that the encapsulation and hydrogenation of complexes played a key role in the selective delignification of pulp. By encapsulating and hydrogenating the complexes, their spatial separation increased which strongly enhanced the activity of complexes. The encapsulation and hydrogenation of complexes resulted in a significant increase in delignification and properties of pulp. The delignification was dependent on the nature of the complexes. The reasons were investigated by spectroscopic techniques. This journal is © the Partner Organisations 2014.