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Harbin, China

Harbin Engineering University , also referred to as HEU, was founded in 1953 in Harbin, China. It offers over 150 degree programs, 48 of which are conducted in English. Designated a Project 211 university, HEU is billed as a top institution for engineering and marine projects. Wikipedia.

Shi J.H.,Harbin Engineering University | Shi J.H.,Nanjing Southeast University | Ma H.F.,Nanjing Southeast University | Jiang W.X.,Nanjing Southeast University | Cui T.J.,Nanjing Southeast University
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

We propose a kind of stereometamaterial composed of periodic structures with twisted asymmetrical split-ring (ASR) resonators. The proposed stereometamaterial has intrinsic chirality and can be used as a multiband polarization spectral filter. Full-wave simulation and experimental results demonstrate that the stereometamaterial with the twist angle of φ=90 exhibits three ripple-free cross-polarization transmission peaks at normal incidence of plane waves. The cross-polarization transmission bands are centered at the maxima of circular dichroism, accompanied by pairs of pure circular birefringence points. In physics, the near-field electric and magnetic coupling of orthogonal ASR molecules in parallel planes contributes to the conversion of two orthogonal linear polarizations. The transmission of the proposed multiband polarization spectral filter can be engineered via the mutual twist angle and asymmetry of the ASRs and the thickness of the dielectric spacer layer and also be tuned via the angle of incidence. © 2012 American Physical Society.

Ge B.,Harbin Engineering University | Zhou Q.-M.,Northeast Forestry University
Mathematical Methods in the Applied Sciences | Year: 2013

In this paper, we obtain the existence of at least two nontrivial solutions for a Robin-type differential inclusion problem involving p(x)-Laplacian type operator and nonsmooth potentials. Our approach is variational, and it is based on the nonsmooth critical point theory for locally Lipschitz functions. © 2013 John Wiley & Sons, Ltd.

Lin J.,Harbin Engineering University
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

Vehicle is once reputed as “the machine changes the world”. It brings us convenient transportation as well as a number of problems like energy safety, environmental pollution and global warming. Nowadays, for global vehicle industry that energy saving and emission reduction have turned to be the significant tasks while new energy vehicle has become the strategic trend. And as China with the cost and market advantages, China with the potential and possibility to obtain a leading position in global new energy vehicle market. New energy vehicle industry, as one of China’s strategic emerging industries, the development process will be faced with many risks, according to the characteristics of the industry, identify the risk scientific and timely, on the basis of earlier studies’ review, this paper use scenario analysis method to identify the risk of China’s new energy vehicle industry. © Sila Science. All rights reserved.

Shi L.,Kagawa University | Guo S.,Kagawa University | Guo S.,Harbin Engineering University | Asaka K.,Japan National Institute of Advanced Industrial Science and Technology
International Journal of Robotics and Automation | Year: 2012

In this paper, we introduce a new biomimetic underwater microrobot with a shape memory alloy (SMA). It moves like a jellyfish while floating or sinking and has two pectoral fins to implement a swimming motion like that of a butterfly. To achieve a larger volume change, the body was designed as a triangular prism. We then modelled the characteristics of the body and calculated its floating speed. Moreover, we used two pectoral fins to push water horizontally and analysed the resulting swimming motion. We measured the response time of the SMA actuator with different driving voltages and calculated its theoretical swimming speed. Finally, we developed a prototype hybrid biomimetic microrobot and evaluated floating and swimming speeds experimentally. The values obtained from the floating and swimming experiments were in close agreement with the theoretical values. Also, the experimental floating performance of the new microrobot was better than that of the earlier two-ring units. Its floating speed reached a maximum of 10.2 mm/s, and it attained a maximum swimming speed of 57.2 mm/s at 24 V, a frequency of 0.4 Hz, and a duty cycle of 35%. Additionally, it exhibited better flexibility, balance, and load capacity than its predecessors.

Xiao N.,Kagawa University | Guo S.,Kagawa University | Guo S.,Harbin Engineering University
International Journal of Robotics and Automation | Year: 2012

We describe a micro-operating mechanism for a human-scale teleoperating system. The Bouc-Wen model was used to describe the hysteresis in piezoelectric actuators and parameters were identified to characterize the hysteresis using a genetic algorithm. To improve he performance of the system, a model reference adaptive controller was designed based on the Lyapunov stability theory. Both numerical simulations and experimental results imply that the controller was effective in eliminating the hysteresis in the piezoelectric actuators.

Yu H.,Jiangsu University of Science and Technology | Ni J.,University of Iowa | Zhao J.,Harbin Engineering University
Neurocomputing | Year: 2013

In DNA microarray data, class imbalance problem occurs frequently, causing poor prediction performance for minority classes. Moreover, its other features, such as high-dimension, small sample, high noise etc., intensify this damage. In this study, we propose ACOSampling that is a novel undersampling method based on the idea of ant colony optimization (ACO) to address this problem. The algorithm starts with feature selection technology to eliminate noisy genes in data. Then we randomly and repeatedly divided the original training set into two groups: training set and validation set. In each division, one modified ACO algorithm as a variant of our previous work is conducted to filter less informative majority samples and search the corresponding optimal training sample subset. At last, the statistical results from all local optimal training sample subsets are given in the form of frequence list, where each frequence indicates the importance of the corresponding majority sample. We only extracted those high frequency ones and combined them with all minority samples to construct the final balanced training set. We evaluated the method on four benchmark skewed DNA microarray datasets by support vector machine (SVM) classifier, showing that the proposed method outperforms many other sampling approaches, which indicates its superiority. © 2012 Elsevier B.V.

Lin J.F.,Harbin Engineering University
Advanced Materials Research | Year: 2014

Alternative fuel vehicle industry, as one of China's strategic emerging industries, its development process will be faced with many risks, researching the generation mechanism of risk has important theoretical and practical significance. This paper, in reference to relevant researches, put forward a kind of FIR analysis model (Factor-Interaction-Risk Model) for analysis the risk generation mechanism of China's alternative fuel vehicle industry, the method solve the earlier risk generation mechanism studies' drawbacks being lack of dynamic analysis, the relations among the factors hard to understand and obscure. © (2014) Trans Tech Publications, Switzerland.

Huo Y.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2015

In order to determine the suitability of the Vreman subgrid-scale model for the fire whirls flow field in a vertical shaft with a side slit, numerical simulations by Large Eddy Simulation (LES) were conducted according to use cases based on the Smagorinsky and Vreman subgrid-scale models. The comparison results illustrated that the flame state obtained by using the LES technology based on the Smagorinsky subgrid-scale model was in alignment with the experiment. However, numerical simulation results based on the Vreman subgrid-scale model underestimated viscous dissipation near the flame to some extent. Consequently, overestimating the tangential velocity near the fire whirls prevents fire whirls from remaining in a stable state. ©, 2015, Editorial Board of Journal of HEU. All right reserved.

Huang W.,Harbin Engineering University
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2014

Based on the rain-flow counting technique, a frequency domain method is developed for calculating the fatigue damage caused by the combined drag and inertial loads. Firstly, by observation of the combined signal simulated, the combined load can be considered as the oscillation of the high frequency inertial force around the low frequency drag force with the random amplitudes, which makes it possible to identify the rain-flow large and small cycles. The cyclic range of rain-flow small cycles are determined by considering the reduced effect of the low frequency drag forces on the cyclic range of high frequency inertial forces. The cyclic ranges of rain-flow large cycles are determined by means of Turkstra's rule of load combination. The numerical analysis show that the damages estimated by the developed method are very close to the rainflow damages. Copyright © 2014 by ASME.

Hou Z.,CAS Changchun Institute of Applied Chemistry | Hou Z.,Harbin Engineering University | Li C.,CAS Changchun Institute of Applied Chemistry | Ma P.,CAS Changchun Institute of Applied Chemistry | And 7 more authors.
Advanced Functional Materials | Year: 2012

Up-conversion (UC) luminescent and porous NaYF 4:Yb 3+, Er 3+@SiO 2 nanocomposite fibers are prepared by electrospinning process. The biocompatibility test on L929 fibrolast cells reveals low cytotoxicity of the fibers. The obtained fibers can be used as anti-cancer drug delivery host carriers for investigation of the drug storage/release properties. Doxorubicin hydrochloride (DOX), a typical anticancer drug, is introduced into NaYF 4:Yb 3+, Er 3+@SiO 2 nanocomposite fibers (denoted as DOX-NaYF 4:Yb 3+, Er 3+@SiO 2). The release properties of the drug carrier system are examined and the in vitro cytotoxicity and cell uptake behavior of these NaYF 4:Yb 3+, Er 3+@SiO 2 for HeLa cells are evaluated. The release of DOX from NaYF 4:Yb 3+, Er 3+@SiO 2 exhibits sustained, pH-sensitive release patterns and the DOX-NaYF 4:Yb 3+, Er 3+@SiO 2 show similar cytotoxicity as the free DOX on HeLa cells. Confocal microscopy observations show that the composites can be effectively taken up by HeLa cells. Furthermore, the fibers show near-infrared UC luminescence and are successfully applied in bioimaging of HeLa cells. The results indicate the promise of using NaYF 4:Yb 3+, Er 3+@SiO 2 nanocomposite fibers as multi-functional drug carriers for drug delivery and cell imaging. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Huang X.-M.,Harbin Engineering University
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2010

Aiming at Computer Numerical Control(CNC) equipment controller as network physical node of infrastructure level in networked reconfigurable production line, adaptability and enhancement of STandard for the Exchange of Product model data-NC(STEP-NC) compliant open architecture controller for distributed and reconfigurable manufacturing were analyzed. Based on STEP-NC data program, IEC 61499 mechanism was introduced to improve overall reconfigurable control performance. Making machining feature as bridge connecting STEP-NC and IEC 61499, Device model of CNC equipment compliant to IEC 61499 was constructed. Flexible control structure was designed centering on axis control based Resource model and local machining function module, also design method for event-driven major function modules was discussed in detail. A case study for four-axis motion control platform was provided at last.

Guo S.,Kagawa University | Guo S.,Harbin Engineering University | Shi L.,Kagawa University | Xiao N.,Kagawa University | Asaka K.,Japan National Institute of Advanced Industrial Science and Technology
Robotics and Autonomous Systems | Year: 2012

Underwater microrobots are in urgent demand for applications such as pollution detection and video mapping in limited space. Compact structure, multi-functionality, and flexibility are normally considered incompatible characteristics for underwater microrobots. Nevertheless, to accomplish our objectives, we designed a novel inchworm-inspired biomimetic locomotion prototype with ionic polymer metal composite (IPMC) actuators, and conducted experiments to evaluate its crawling speed on a flat underwater surface. Based on this type of biomimetic locomotion, we introduced a new type of underwater microrobot, using ten IPMC actuators as legs or fingers to implement walking, rotating, floating, and grasping motions. We analysed the walking mechanism of the microrobot and calculated its theoretical walking speed. We then constructed a prototype of the microrobot, and carried out a series of experiments to evaluate its walking and floating speeds. Diving/surfacing experiments were also performed by electrolysing the water around the surfaces of the actuators. The microrobot used six of its actuators to grasp small objects while walking or floating. To implement closed-loop control, we employed three proximity sensors on the microrobot to detect an object or avoid an obstacle while walking. © 2012 Elsevier Ltd. All rights reserved.

Xing L.-L.,Northeastern University China | Ma C.-H.,Northeastern University China | Chen Z.-H.,Northeastern University China | Chen Y.-J.,Harbin Engineering University | Xue X.-Y.,Northeastern University China
Nanotechnology | Year: 2011

Pd-ZnO nanoflowers with high uniformity were prepared via a novel one-step hydrothermal route. High sensitivity, fast response, high selectivity and low work temperature are obtained from Pd-ZnO nanoflower sensors. The sensitivity upon exposure to 300ppm ethanol is up to 168 at 300 °C and maintains 2.6 at 120 °C. Such behaviors can be attributed to Schottky contact at the Pd/ZnO interface and catalytic activity of Pd nanoparticles. The present results open a way for uniform surface modification of one-dimensional nanostructures with Pd nanoparticles and further enhancing their gas sensing performance. © 2011 IOP Publishing Ltd.

Tan Y.,Harbin Institute of Technology | Ouyang J.,Harbin Institute of Technology | Lv J.,Harbin Institute of Technology | Lv J.,Harbin Engineering University | Li Y.,Harbin Institute of Technology
Construction and Building Materials | Year: 2013

Cement asphalt mortar (CA mortar) is a key material of non-ballasted track structure. In order to solve the problem that cement hardens slowly in CA mortar, the retarding effect of emulsifier on cement hydration was studied by measurement of cement setting time, hydration heat and X-ray diffraction analysis. Results show that emulsifier has significant retarding effect on cement hydration, which is relevant to the types of emulsifier and its dosages. The retarding effect increases with the increment of the mass ratio of emulsifier to cement. Significant differences in the setting time, cement hydration rate, hydration heat and the content of Ca(OH)2 are detected utilizing different types of emulsifier. Emulsifier with excessive retarding effect on cement not only abort cement hydration in early age, but also cause a loss in the later hydration heat and content of cement hydrates. Therefore, suitable emulsifier with little retarding effect on cement hydration and its appropriate dosage are recommended when producing asphalt emulsion for CA mortar. © 2013 Elsevier Ltd. All rights reserved.

Guo C.,Harbin Institute of Technology | Mao J.,Harbin Engineering University | Wang D.,Harbin Institute of Technology
RSC Advances | Year: 2014

One great challenge in the development of lithium-ion batteries is to simultaneously achieve superior reversible specific capacity, cyclic life and rate capability. In this work, nitrogen-doped carbon coated Silicon monoxide nanoparticles further co-modified with nitrogen-doped graphene were developed. The nanostructure of Silicon monoxide was designed and realized by introducing the highly efficient attritor mill technique, which assisted in forming optimized morphology and particle size distributions of the precursor. The nitrogen-doped carbon coating process was achieved by a simple surface coating technique using a carbon and nitrogen containing ionic liquid as a precursor, and the nitrogen-doped graphene was prepared by a facile, catalyst-free thermal annealing approach using low-cost industrial material melamine as the nitrogen source. XRD, XPS, RAMAN, FESEM, EDAX, TEM, HRTEM, AFM, BET, elemental analysis, electrical conductivity measurement and electrochemical methods were used to characterize the material's properties. The results showed that the reduced active particle size, coupled with the co-modification of the NC coating layer and NG network could effectively construct a 3D conducting network through a 3D "sheet-web" mode. As a result, the composite material showed exceptional high reversible specific capacity, ultra long cyclic life and superior high-rate capability. The present strategy opens up the possibility for integrating other anode materials with large volume variations and low electrical conductivities into current lithium-ion battery manufacture technology. © 2014 the Partner Organisations.

Wang S.L.N.,Harbin Engineering University
Journal of Engineering Mathematics | Year: 2011

A Galerkin smoothed-particle hydrodynamics formulation employing a meshless moving-least-squares approximation is implemented for solving problems in solid mechanics with large deformation. The method combines a Lagrangian kernel formulation with stabilized nodal integration. The performance of the methodology proposed is tested through various simulations, demonstrating the attractive ability of particle methods to handle severe distortions and complex phenomena. © 2011 Springer Science+Business Media B.V.

Jing Y.,Harbin Institute of Technology | Wu G.,Harbin Engineering University | Guo L.,Harbin Institute of Technology | Sun Y.,Harbin Institute of Technology | Shen J.,Harbin Institute of Technology
Computational Materials Science | Year: 2013

Using the non-equilibrium Green's function method together with the density-functional theory, the electronic transport properties of graphyne and its family have been studied. Unlike graphene, the graphyne and its family display semi-conductive characteristic along zigzag direction and metallic characteristic along armchair direction. The transport properties of graphyne and its family are associated with the length of C link in their structures. With the length of C link increasing, the electrical conductivity decreases. In addition, both the zigzag and armchair graphdiyne nanoribbons display semi-conductive characteristic. The armchair graphene-graphdiyne nanoribbon heterojunction displays symmetrical semi-conductive characteristic. However, the zigzag graphene-graphdiyne nanoribbon heterojunction shows asymmetrical metallic characteristic and displays the superior rectification behavior. Comparison with the previous studies, it can be found that the heterojunction constructed with metallic and semi-conductive nanoelements which behave distinct electronic structures can display the rectification behavior, and it can open up opportunities for design of nanodevices. © 2013 Published by Elsevier B.V. All rights reserved.

Han H.-Z.,Harbin Engineering University | Han H.-Z.,Harbin Institute of Technology | Li B.-X.,Harbin Institute of Technology | Wu H.,Harbin Institute of Technology | Shao W.,Harbin Institute of Technology
International Journal of Thermal Sciences | Year: 2015

Integrated a fully developing three-dimensional heat transfer and flow model, a multi-objective optimization aims to fulfill the geometric design for double-tube heat exchangers with inner corrugated tube is investigated in this work with RSM. Dimensionless corrugation pitch (p/D), dimensionless corrugation height (H/D), dimensionless corrugation radius (r/D) and Reynolds number (Re) are considered as four design parameters. Considering the process parameters, the characteristic numbers involving heat transfer characteristic, resistance characteristic and overall heat transfer performance calculated by CFD, and are served as objective functions to the RSM (Nuc, fc, Nuc/Nuc, fs/fc and σ in this paper). The results of optimal designs are a set of multiple optimum solutions, called 'Pareto optimal solutions'. It reveals the identical tendency of Nuc/Nus and fc/fs reflecting the conflict between them that means augmenting the heat transfer performance with various design parameters in the optimal situation inevitably sacrificed the increase of flow resistance. According to the Pareto optimal curves, the optimum designing parameters of double pipe heat exchanger with inner corrugated tube under the constrains of Nuc/Nus ≥ 1.2 are found to be P/D = 0.82, H/D = 0.22, r/D = 0.23, Re = 26,263, corresponding to the maximum value of σ = 1.12. © 2014 Elsevier Masson SAS. All rights reserved.

Tan Q.,Harbin Institute of Technology | Du C.,Harbin Institute of Technology | Yin G.,Harbin Institute of Technology | Zuo P.,Harbin Institute of Technology | And 2 more authors.
Journal of Catalysis | Year: 2012

This paper reports the easy synthesis of Au@Pd core-shell nanoparticles (NPs) with uniform shell thickness and demonstrates their viability as a nonplatinum catalyst for the electrooxidation of methanol in alkaline anion-exchange membrane fuel cells. The synthesis involves the first preparation of Au core NPs, followed by a three-phase-transfer procedure to coat Pd shells, through which homogeneous Pd shell growth on Au cores can be achieved. The as-prepared Au@Pd NPs have an activity more than 40 times higher than that of the Pd catalyst for the methanol oxidation. Moreover, these Au@Pd NPs possess excellent stability (over seven times more stable than Pd catalysts). The remarkable performance enhancement is mainly attributed to the finely tailored electronic structure of the Pd shell achieved by the underlying Au core. The easily synthesized Au@Pd core-shell NPs represent a promising class of nonplatinum anode catalysts with high activity and durability for alkaline fuel cell applications. © 2012 Elsevier Inc. All rights reserved.

Ishitake K.,Nagoya University | Satoh K.,Nagoya University | Kamigaito M.,Nagoya University | Okamoto Y.,Nagoya University | Okamoto Y.,Harbin Engineering University
Polymer Chemistry | Year: 2012

The synthesis of stereogradient polymers with tacticities that vary from predominantly syndiotactic to highly isotactic was investigated by reversible addition-fragmentation chain transfer (RAFT) copolymerization of bulky methacrylates, such as triphenylmethyl methacrylate (TrMA) and 1-phenyldibezosuberyl methacrylate (PDBSMA) and methacrylic acid (MAA) in both non-polar and polar solvents. The MAA monomer showed increased reactivity in toluene because of hydrogen bonding and was consumed slightly faster than TrMA or PDBSMA. However, the RAFT copolymerization of TrMA and MAA in 1,4-dioxane resulted in consumption of both monomers at the same rate. The copolymers can be easily converted to homopoly(MAA) by the acid hydrolysis of the bulky group and converted further to poly(methyl methacrylate) by methyl esterification using trimethylsilyldiazomethane to analyze the molecular weights and tacticity. The molecular weights of the polymers obtained in both solvents increased with monomer conversion, which indicates that controlled/living radical copolymerization proceeded irrespective of the solvents. 13C NMR analyses of the polymers revealed that stereogradient polymers were produced in toluene, in which the tacticity changed from mm = 11% to nearly 100%, whereas the copolymers obtained in 1,4-dioxane resulted in nearly atactic enchainment (rr/mr/mm ≈ 38/49/13), independent of monomer conversion. A similar stereogradient copolymer was also obtained by RAFT copolymerization of PDBSMA and MAA in toluene, where the isotacticity changed more gradually from mm = 14% to nearly 100%. © 2012 The Royal Society of Chemistry.

Chen Y.,East China University of Science and Technology | Liu X.,East China University of Science and Technology | Liu X.,University of Pennsylvania | Mao X.,East China University of Science and Technology | And 3 more authors.
Nanoscale | Year: 2014

Ferromagnetic γ-Fe2O3 nanoparticles were successfully loaded into multi-walled carbon nanotubes (MWNTs) as probed by transmission electron microscopy. Upon incorporation of the γ-Fe 2O3-MWNTs into poly(p-phenylenebenzobisoxazole) (PBO), a conjugated polymer with high mechanical strength and outstanding thermal and oxidative stability, microwave absorbing materials were obtained. Attributed to the special structure of the γ-Fe2O3-MWNTs, synergistic effects on dielectric loss and magnetic loss, and a better matched characteristic impedance of the composites were achieved. The optimal minimum reflection loss reached -32.7 dB at 12.09 GHz on a composite containing 12 wt% γ-Fe2O3-MWNTs with a thickness of 2.7 mm, and the corresponding bandwidth below -5 dB was 6.2 GHz. This demonstrated its potential applications as a low-density microwave absorbing material operating under extreme environments. © The Royal Society of Chemistry 2014.

Jiao Z.B.,City University of Hong Kong | Luan J.H.,City University of Hong Kong | Zhang Z.W.,Harbin Engineering University | Miller M.K.,Oak Ridge National Laboratory | Liu C.T.,City University of Hong Kong
Scripta Materialia | Year: 2014

NiAl-strengthened high-strength steels usually have high Ni and Al contents in order to form hardening particles. Here, several new low-Ni steels are reported, which achieve a combination of relatively low cost, high strength and good ductility mainly through the precipitation of high number densities of nanoscale NiAl precipitates as characterized by atom probe tomography. The precipitation parameters are tuned by optimizing both alloy compositions and heat-treatment parameters. The strengthening effects of nanoscale NiAl and Mo/W-rich carbides are quantitatively analyzed and assessed.

Chang J.-C.,National Taipei University of Technology | Hung T.-C.,National Taipei University of Technology | He Y.-L.,Xian Jiaotong University | Zhang W.,Harbin Engineering University
Applied Energy | Year: 2015

This paper focuses on experimental performance of an open-drive scroll type expander in an organic Rankine cycle (ORC) system. The expander was an originally oil-free scroll type air compressor with a built-in volume ratio of 4.05. The cycle used HFC-245fa as working fluid, and the loop has been mixed with a moderate concentration of refrigerant oil that circulated in the cycle. The experimental results of this study are divided into two main parts: first part focuses the experimental performance on the fixed superheating at the expander inlet with respect to various pressure differences of the system and rotational speeds of the expander. Second part involves various superheating at the expander inlet which was operated at fixed rotational speed and operating pressure difference of 5. bars and 6. bars. When the cycle was operated under fixed superheating conditions, the maximum cycle efficiency, expander efficiency and power output of the expander are 9.44%, 73.1% and 2.3. kW respectively. On the other hand, when the expander is operated in various superheating conditions, the expander and cycle efficiency simultaneously increase with the increasing of superheating. In addition, this paper not only focuses on the experimental results using the current expander, but also integrates the previous experimental data with present study to identify an appropriate scroll type expander with respect to various operating pressure differences for the heat source below 100. °C. © 2015 Elsevier Ltd.

Wang X.,Harbin Engineering University
Sensors (Basel, Switzerland) | Year: 2014

In this paper, a new tensor-based subspace approach is proposed to estimate the direction of departure (DOD) and the direction of arrival (DOA) for bistatic multiple-input multiple-output (MIMO) radar in the presence of spatial colored noise. Firstly, the received signals can be packed into a third-order measurement tensor by exploiting the inherent structure of the matched filter. Then, the measurement tensor can be divided into two sub-tensors, and a cross-covariance tensor is formulated to eliminate the spatial colored noise. Finally, the signal subspace is constructed by utilizing the higher-order singular value decomposition (HOSVD) of the cross-covariance tensor, and the DOD and DOA can be obtained through the estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm, which are paired automatically. Since the multidimensional inherent structure and the cross-covariance tensor technique are used, the proposed method provides better angle estimation performance than Chen's method, the ESPRIT algorithm and the multi-SVD method. Simulation results confirm the effectiveness and the advantage of the proposed method.

Zhang S.Z.,Harbin Engineering University
Advanced Materials Research | Year: 2014

There is close relationship between social adaptation ability and the competition ability of college students.However, due to multiple factors such as individual, family and society, contemporary college students' psychology undergoing dramatic changes and the non-intelligence factors in their AQ (Adversity Quotient) is not enough, showing the low ability of anti-frustration, the lack of debugging skills and cognitive attribution,and a series of psychosocial tendencies not suited with the society. In this paper, through the study found that: Outward-Bound, as a new way to develop social adaptation ability, not only can directly improve college students' social adaptation ability, also can by cultivating students' AQ, as mediating effect to influence the social adaptation ability. © (2014) Trans Tech Publications, Switzerland.

Zhang Y.,Harbin Engineering University | Chambers J.A.,Loughborough University
International Journal of Adaptive Control and Signal Processing | Year: 2011

A new approach to overdetermined frequency domain blind source separation (BSS) of speech signals which exploits all combinations of observations and hence varying inter microphone spacings is proposed. The observations are divided into subgroups so that conventional frequency domain BSS algorithms can be used. By evaluating the separation performance obtained from each group on the basis of approximately measuring the independence of separated signals, the output of the group that has the best performance among all groups on a frequency-by-frequency basis is chosen as the overall output. The separated signals of the overall system are then obtained by transforming their frequency domain representations into the time domain. Simulation results based on speech signals confirm that the proposed approach has better performance based on the performance index (PI) as compared with a conventional scheme using only one microphone group and an existing overdetermined frequency domain BSS algorithm. © 2010 John Wiley & Sons, Ltd.

Yuan L.,Harbin Engineering University | Dong Y.,University of Alaska Fairbanks
Photonic Sensors | Year: 2011

A loop topology based white light interferometric sensor network for perimeter security has been designed and demonstrated. In the perimeter security sensing system, where fiber sensors are packaged in the suspended cable or buried cable, a bi-directional optical path interrogator is built by using Michelson or Mach-Zehnder interferometer. A practical implementation of this technique is presented by using an amplified spontaneous emission (ASE) light source and standard single mode fiber, which are common in communication industry. The sensor loop topology is completely passive and absolute length measurements can be obtained for each sensing fiber segment so that it can be used to measure quasi-distribution strain perturbation. For the long distance perimeter monitoring, this technique not only extends the multiplexing potential, but also provides a redundancy for the sensing system. One breakdown point is allowed in the sensor loop because the sensing system will still work even if the embedded sensor loop breaks somewhere. © The Authors(s) 2010.

Wang Y.,Harbin Engineering University
Applied Mechanics and Materials | Year: 2014

In the atmospheric turbulence, the effects of atmospheric turbulence and transmitted optical power on the BER performance of ultraviolet communication system are analyzed and simulated. The simulation results show that when the atmospheric turbulence strength changes from weak to strong, the BER performance deteriorates along. Compared to OOK intensity modulation, the BPSK subcarrier intensity modulation can be more effectively to inhibit atmospheric turbulence effect on ultraviolet communication system. Under the certain atmospheric turbulence strength, the BER performance of ultraviolet communication system will be improved along with the increase of the transmitted optical power. © (2014) Trans Tech Publications, Switzerland.

Ning W.,Harbin Engineering University
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao | Year: 2016

Artificial intelligence is the study of human intelligence activities of the laws of science, in College English Teaching in the application of artificial intelligence technology, combined with Internet, to develop the computer aided teaching expert system, can be an effective solution to problems, the College English teaching reform facing the shortage of teachers, teaching pattern is unitary and so on, realizing the sharing of teaching resources, effectively improve the quality of teaching, to reduce the burden on teachers, to strengthen the students' independent learning ability. This paper introduces the principles, characteristics and application fields of artificial intelligence, analyzes the problems existing in College English teaching, and puts forward the realization scheme of College English teaching system based on artificial intelligence technology. To study English intelligent classroom model: The model of artificial intelligence and emotion judgment.: Firstly, the emotion model is built on the basis of OCC's emotion model and Ekman's basic emotion theory. Secondly, the Multi-Agent system is built based on the Agent technology in artificial intelligence. Finally, the simulation experiment is carried out.: In this paper, a method of teaching agent Emotion Modeling Based on fuzzy logic is proposed, which embodies the essence of the dynamic model and the fuzzy nature of emotion. The simulation results show that the model can be used to make intelligent response according to the students' emotional characteristics in English class.: The application of intelligent module is beneficial to the students' English learning and the communication of teacher's information in English class.

Hou Z.,CAS Changchun Institute of Applied Chemistry | Hou Z.,Harbin Engineering University | Li G.,CAS Changchun Institute of Applied Chemistry | Lian H.,CAS Changchun Institute of Applied Chemistry | Lin J.,CAS Changchun Institute of Applied Chemistry
Journal of Materials Chemistry | Year: 2012

This feature article highlights the recent advances on the preparation, characteristics and application of one-dimensional (1D) luminescent materials (including rare earth based inorganic materials, rare earth based composite materials and non rare earth materials) by an electrospinning process. Electrospinning is an effective method to prepare 1D polymer, composite and inorganic submicro- or nano-materials. The key strategy of the electrospinning method is to form an electrospinning solution with viscoelastic behavior similar to that of a conventional polymer solution. It utilizes an electrical force on the surface of an electrospinning solution to overcome the surface tension and produce a very thin charged jet. This jet moves straight for a certain distance, and then bends into looping and spiraling paths. During the elongation of the liquid jet, solvent evaporates and 1D hybrid materials accumulate on a grounded collector. Dispersing complexes or inorganic nanoparticles into polymer and inorganic matrices, composite luminescent materials via electrospinning combine both inorganic and organic characters. Annealing the inorganic/polymer hybrid precursors can yield various kinds of inorganic luminescent materials with fiber, wire, belt and tube-like morphologies, which have potential applications in fluorescent lamps and color displays. Furthermore, with the addition of some surfactants, it is possible to prepare 1D luminescent and porous multifunctional materials, which can act as potential drug carriers in the biomedical area. © The Royal Society of Chemistry 2012.

Lu Y.,Harbin Engineering University
Nonlinear Dynamics | Year: 2012

The contribution of this paper is to show a method for controlling intracellular calcium bursting oscillations including frequency and magnitude that have not been controllable before. The method is based on an understanding of system level behaviors as a phenomenon of self-organization. In these systems, the overall function is a consequence of the interaction between the system's elements. Therefore, if the aim is to control the system's signals and overall function, it seems reasonable to interact with its elements. In this paper the method is investigated by means of the calcium-induced calcium release (CICR) model proposed by Borghans et al. and a number of representative simulations of intracellular calcium bursting oscillations are used to illustrate the control of these oscillations. © 2011 Springer Science+Business Media B.V.

Luo Y.,University of New South Wales | Wen J.,Shanghai University | Zhang J.,University of New South Wales | Zhang J.,Harbin Engineering University | And 2 more authors.
Optics Letters | Year: 2012

We report the first (to our knowledge) development of a Bi/Er/Al/P codoped germanosilica optical fiber showing ultrabroadband luminescence between 1000 and 1570 nm, covering O-, E-, S-, C-, and L-bands, when pumped by 532, 808, or 980 nm lasers. The fluorescence profiles are found highly pump wavelength dependent, closely associated with different combinations of excitations from both Bi centers and Er ions as active centers. With a proper selection of pump wavelength(s), this Bi/Er codoped fiber could be used as an ultrabroadband gain medium for ultrabroadband amplified spontaneous emission sources, fiber lasers, or amplifiers in telecommunications and in other fields. © 2012 Optical Society of America.

Zhao D.-W.,Harbin Engineering University
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010 | Year: 2010

Thrust allocation is an important part of the dynamic positioning system, which determining the thrust and the direction of each of the thruster devices from the control law. This paper proposes a rational and effective method of solving thrust allocation to the semi-submersible rig based on the adaptive genetic algorithm. It is realizing the global parallel operations, achieving search in a large area, and convergence speed better then simple genetic algorithm. The validity and excellent performance of this algorithm was proved by the simulation results. © 2010 IEEE.

Liu F.-Q.,Harbin Engineering University
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010 | Year: 2010

In order to aid walking and limb rehabilitation training, a four-degree pelvic pose and position control mechanism of walking aid robot is discussed based on the motion laws of human pelvic. By applying modified D-H method, a kinematical coordinate system of the pose and position control mechanism is set up and the forward and inverse kinematics models are also built up. After the design of control models and the simulation analysis of them, a simulation curve of the motion laws in one gait circle is achieved. The result of simulation shows that this mechanism can realize the control over four-degree motions of human pelvis and this research supplies theoretical basis for the design of control system and the realization of motion control in walking aid robot. © 2010 IEEE.

Wang X.J.,Harbin Institute of Technology | Wang N.Z.,Harbin Institute of Technology | Wang L.Y.,Harbin Turbine Company Ltd | Hu X.S.,Harbin Institute of Technology | And 3 more authors.
Materials and Design | Year: 2014

The novel stir casting assisted by ultrasonic treatment processing was studied. Unlike traditional stir casting, short semi-solid stir time was needed for addition and pre-dispersion of the particles in the novel processing. For ultrasonic treatment, there existed an optimal time. Both too short and too long time for the treatment resulted in nonhomogeneous particle distribution. Furthermore, the liquid stirring after ultrasonic treatment was proved to be necessary to further improve particle distribution. The mechanical properties of the composites fabricated by different parameters indicated that ultrasonic treatment evidently improved the mechanical properties compared with traditional stir casting. 5-20% SiCp/AZ91 composites were fabricated by the novel processing. The particle distribution was uniform in these composites. The grains were refined by addition of SiC particles. Grain sizes of composites decreased with the increases of particle contents. The ultimate tensile strength, yield strength and elastic modulus were enhanced as the particle contents increased. © 2014 Elsevier Ltd.

Li C.,CAS Changchun Institute of Applied Chemistry | Li C.,University of Chinese Academy of Sciences | Jin J.,CAS Changchun Institute of Applied Chemistry | Liu J.,CAS Changchun Institute of Applied Chemistry | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Hemocompatibility and oxidative stress are significant for blood-contacting devices. In this study, N-isopropylacrylamide (NIPAAm) and N-(3-aminopropyl) methacrylamide hydrochloride (APMA) were cografted on polypropylene (PP) membrane using ultraviolet grafting to load antioxidative d-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) and control the release of TPGS. The immobilization of NIPAAm and APMA onto PP membrane was confirmed by attenuated total reflectance Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. Combined with data from platelet adhesion, red blood cell (RBC) attachment, and hemolysis rate, the hemocompatibility of PP was significantly improved. An in-depth characterization using hemolysis rate test, scanning electron microscopy, atomic force microscopy, and confocal laser scanning microscopy was conducted to confirm that the mechanism of the release of TPGS interacted with RBCs was different at different stages. The release of TPGS from the loading PP membranes affected hemolysis at different stages. At the early stage of release, TPGS maintained the tiny (nanometer-sized) tubers on the membrane surface and enhanced the membrane permeabilization by generating nanosized pores on the cell membranes. Afterward, the incorporated TPGS slowed the lipid peroxidation of erythrocytes and filled in the lipid bilayer of erythrocyte to prevent hemolysis. Thus, the approach implemented to graft NIPAAm and APMA and load TPGS was suitable to develop medical device with excellent hemocompatibility and antioxidative property. © 2014 American Chemical Society.

Xie X.,Shanghai JiaoTong University | Zheng H.,Shanghai JiaoTong University | Jin G.,Harbin Engineering University
Composites Part B: Engineering | Year: 2015

Abstract The objective of this work is to present a Haar Wavelet Discretization (HWD) method-based solution approach for the free vibration analysis of functionally graded (FG) spherical and parabolic shells of revolution with arbitrary boundary conditions. The first-order shear deformation theory is adopted to account for the transverse shear effect and rotary inertia of the shell structures. Haar wavelet and their integral and Fourier series are selected as the basis functions for the variables and their derivatives in the meridional and circumferential directions, respectively. The constants appearing in the integrating process are determined by boundary conditions, and thus the equations of motion as well as the boundary condition equations are transformed into a set of algebraic equations. The proposed approach directly deals with nodal values and does not require special formula for evaluating system matrices. Also, the convenience of the approach is shown in handling general boundary conditions. Numerical examples are given for the free vibrations of FG shells with different combinations of classical and elastic boundary conditions. Effects of spring stiffness values and the material power-law distributions on the natural frequencies of shells are also discussed. Some new results for the considered shell structures are presented, which may serve as benchmark solutions. © 2015 Elsevier Ltd. All rights reserved.

Deng C.,Harbin Normal University | Zhang S.,Harbin Engineering University
ACS Applied Materials and Interfaces | Year: 2014

Tailoring materials into nanostructure offers unprecedented opportunities in the utilization of their functional properties. High-purity Na 7V4(P2O7)4(PO 4) with 1D nanostructure is prepared as a cathode material for rechargeable Na-ion batteries. An efficient synthetic approach is developed by carefully controlling the crystal growth in the molten sodium phosphate. Based on the XRD, XPS, TG, and morphological characterization, a molten-salt assisted mechanism for nanoarchitecture formation is revealed. The prepared Na 7V4(P2O7)4(PO 4) nanorod has rectangle sides and preferential [001] growth orientation. GITT evaluation indicates that the sodium de/intercalation of Na7V4(P2O7)4(PO 4) nanorod involves V3+/V4+ redox reaction and Na5V3.5+ 4(P2O7) 4(PO4) as intermediate phase, which results in two pairs of potential plateaus at the equilibrium potentials of 3.8713 V (V 3+/V3.5+) and 3.8879 V (V3.5+/V4+), respectively. The unique nanoarchitecture of the phase-pure Na7V 4(P2O7)4(PO4) facilitates its reversible sodium de/intercalation, which is beneficial to the high-rate capability and the cycling stability. The Na7V4(P 2O7)4(PO4) cathode delivers 80% of the capacity (obtained at C/20) at the 10 C rate and 95% of the initial capacity after 200 cycles. Therefore, it is feasible to design and fabricate an advanced rechargeable sodium-ion battery by employment of 1D nanostructured Na 7V4(P2O7)4(PO 4) as the cathode material. © 2014 American Chemical Society.

Li J.-H.,Harbin Engineering University
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2010

To search for more efficient optimization method for multi-project resource leveling problem, combination of genetic & ant colony algorithms (CGAA) was proposed. Firstly, a mathematical model was constructed. The optimization objective was the variance of total resource consumption within unit time for all projects. Secondly, CGAA for solving this model was designed. Genetic algorithm was used to conduct iterative resolution by making full use of its speed and global convergence which resulted in generation of initial pheromone distribution. Then ant colony algorithm was used to search for optimal partitioning scheme by its positive feedback and high efficiency. Finally, an example was given to validate the feasibility and effectiveness of the approach.

Liu Q.,Harbin Engineering University | Wang X.,Nanyang Technological University
Multidimensional Systems and Signal Processing | Year: 2016

In this paper, a reweighted (Formula presented.) norm penalty algorithm for direction of arrival (DOA) estimation in monostatic multiple-input multiple-output radar is proposed. In the proposed method, exploiting the inherent multidimensional structure of received data after matched filtering, the singular value decomposition (SVD) technique of the data matrix is employed to reduce the dimension of the received signal. Then a novel weight matrix is designed for reweighting the (Formula presented.) norm minimization by exploiting the coefficients of the reduced-dimensional Capon (RD-Capon) spatial spectrum. The proposed algorithm enhances the sparsity of the solution by the reweighted (Formula presented.) norm constraint minimization, and the DOAs can be estimated by finding the non-zero rows of the recovered matrix. Owing to utilizing the SVD technique and the novel weight matrix, the proposed algorithm can provide better angle estimation performance than RD-Capon and (Formula presented.)-SRACV algorithms. Furthermore, it is suitable for coherent sources and has a low sensitivity to the incorrect determination of the source numbers. The effectiveness and superior performance of the proposed algorithm are demonstrated by numerical simulations. © 2016 Springer Science+Business Media New York

Tang H.,Harbin Engineering University | Tang H.,University of Idaho | Pesic B.,University of Idaho
Electrochimica Acta | Year: 2014

The electrochemical behavior of LaCl3 dissolved in molten LiCl-KCl eutectic salt was studied in the temperature range of 693-823 K by using inert electrodes, Mo as the cathode, and high density graphite as the anode. Cyclic voltammetry, chronopotentiometry and square wave voltammetry were used to determine major kinetic parameters. The standard reaction rate constant of the order ≈ 10-3 cm s-1, determined by Nicholson method, placed the redox reaction of lanthanum in the quasi-reversible range per Matsuda-Ayabe criteria for practical concept of electrochemical reversibility. Sand's equation was used to determine the diffusion coefficient of La(III) ions at four different temperatures. The effect of temperature on diffusion coefficient obeyed the Arrhenius law, according to which the activation energy for diffusion of La(III) ions was 33.5 ± 0.5 kJ mol-1. The exchange current density of La(III)/La(0) redox reaction, evaluated at three different temperatures by linear polarization method on Mo and La substrates, was consistently somewhat higher on the later. For each temperature, the equilibrium potential of La(III)/La(0) redox couple was determined by using open circuit chronopotentiometry, with subsequent calculation of the apparent standard potential, ELa(III/La(0))*0, and the apparent Gibbs free energy, ΔGLaCl3*0 The activity coefficients for LaCl3, γLaCl333 was determined from the difference of apparent and standard Gibbs free energies, ΔGLaCl3*0- ΔGLaCl3(SC)0. The nucleation mechanism of lanthanum deposition on a molybdenum substrate according to the electrochemical model of Scharifker-Hill indicated the instantaneous nucleation with three-dimensional growth of the hemispherical nuclei. Contrary to this, the SEM studies of electrode surface morphology as a function of electrodeposition time clearly showed that La nucleation and growth follows the mechanisms responsible for dendritic growth. For the first time, the transient dendritic morphology events were possible to record, which is the major contribution of this work. © 2013 Elsevier Ltd.

Liu S.,Harbin Engineering University | Zhang Y.,Harbin Institute of Technology
Applied Optics | Year: 2012

We describe the effects of incoherent pump on an atomic filter based on laser-induced optical anisotropy in a three-level ladder system interacting with a strong pump polarized circularly and a weak probe polarized linearly. According to the analysis of the numerical simulation results with some comparison, at the same time of eliminating noise, the filter can enhance the probe's transmission or even the probe gain can be achieved without population inversion. Moreover, the incoherent pumping rate and the cell temperature performance are evaluated and measures are taken to improve the filter's transmission and tunability by selecting proper parameters. © 2012 Optical Society of America.

Liu L.,Harbin Engineering University | Ding Z.,Huaiyin Institute of Technology
Mathematical Problems in Engineering | Year: 2013

A new method of transformer fault diagnosis based on relevance vector machine (RVM) is proposed. Bayesian estimation is applied to support vector machine (SVM) in the novel algorithm, which made fault diagnosis system work more effectively. In the paper, the analysis model is presented that the solutions of RVM have the feature of sparsity and RVM can obtain global solutions under finite samples. The process of transformer fault diagnosis for four working statuses is given in experiments and simulations. The results validated that this method has obvious advantages of diagnosis time and accuracy compared with backpropagation (BP) neural networks and general SVM methods. © 2013 Lutao Liu and Zujun Ding.

Peng R.,Jiangsu University | Peng R.,University of Minnesota | Yi F.,Harbin Engineering University
Physica D: Nonlinear Phenomena | Year: 2013

Identifying the epidemic risk for infectious disease is crucial in order to effectively perform control measures. In a series of our work, from an analytical aspect we study the effects of epidemic risk and population movement on the spatiotemporal transmission of infectious disease via an SIS epidemic reaction-diffusion model proposed by Allen et al. (2008) in [36]. In Allen et al. (2008) [36], Peng (2009) [37], it was assumed that the habitat of the populations consists of only the low and high risk areas. The present paper concerns a more complicated heterogeneous environment where the moderate risk area occurs, and deals with two cases: (i) only the moderate and high risk areas exist; (ii) the low, moderate and high risk areas coexist. In each case, we rigorously determine the asymptotic profile of the positive steady state (i.e., the endemic equilibrium) as the migration rate of either the susceptible or infected population tends to zero. Our results show how epidemic risk and population movement affect the spatial distribution of infectious disease and thereby suggest important implications for predicting the patterns of disease occurrence and designing optimal control strategies. Numerical simulations are carried out to support the theoretical results. © 2013 Elsevier B.V. All rights reserved.

Zhong Y.,Harbin Engineering University
International Journal of Production Research | Year: 2012

The shipyard block erection system (SBES) is a typical discrete-event dynamic system. To model multiprocessing paths and a concurrent assembly procedure, a timed Petri net (TPN) is proposed. The definition of a Petri net is extended to accord with the real-world SBES organisation. The basic TPN modules are presented to model the corresponding variable structures in the SBES, and then the scheduling model of the whole SBES is easily constructed. A modified discrete particle swarm optimisation (PSO) based on the reachability analysis of Petri nets is developed for scheduling of the SBES. In the proposed algorithm, particles are coded by welding transitions and selecting places of the TPN model, and then the collaboration and competition of particle individuals is simulated by crossover and mutation operators in a genetic algorithm. Numerical simulation suggests that the proposed TPN-PSO scheduler can provide an improvement over the conventional scheduling method. Finally, a case study of the optimisation of a back block erection process is provided to illustrate the effectiveness of the method. © 2012 Copyright Taylor and Francis Group, LLC.

Song Z.,Kagawa University | Guo S.,Kagawa University | Guo S.,Harbin Engineering University
Journal of Medical and Biological Engineering | Year: 2012

With the development of neurorehabilitation, physical rehabilitation strategies for the upper limbs have become gradually accepted by therapists and researchers. These strategies include intensive intervention, task-oriented training, and bilateral training. Most upper limb rehabilitation systems have been developed for unilateral training. This paper develops an upper limb exoskeleton rehabilitation device (ULERD) that can be used for bilateral training. The device has three active degrees of freedom (DoFs) in the elbow and wrist joints, and an additional four passive DoFs at these joints to correct any misalignment between the human and device joints. A bilateral training strategy is implemented with the developed ULERD and a haptic device according to neurorehabilitation theory. In a preliminary study, a healthy user was able to manipulate the haptic device with one hand (intact hand for hemiplegic patients) when the upper arm was fixed, and the ULERD assisted in moving the other hand (impaired upper limb for hemiplegic patients). To implement bilateral training, the kinematics of one upper limb (intact limb) and the haptic device is analyzed, respectively. The angles of the three active DoFs are determined via integration. An inertia sensor is used to evaluate the kinematics resolution. The ULERD was evaluated by experienced therapists during the design process to determine its potential for clinic application. Experimental results indicate that the kinematics resolution is effective and that this type of bilateral movement can be implemented using the ULERD and the haptic device.

Tong Y.,Harbin Engineering University | Liu Y.,Nanyang Technological University
Materials Chemistry and Physics | Year: 2010

In the present work, effect of precipitation on two-way shape memory effect and deformation induced martensite stabilization of Ti50Ni25Cu25 ribbon was investigated. The two-way shape memory effect developed as a result of martensite deformation is affected by formation of precipitates. After straining martensite to 5.5%, a two-way shape memory strain of 1.25% was obtained in a sample annealed at 800 °C for 300 s that does not introduce B11 precipitates. Results also show that the deformed Ti50Ni25Cu25 ribbon containing precipitates has multiple-stage transformation characteristics during the first heating. © 2009 Elsevier B.V. All rights reserved.

Yun L.,Harbin Engineering University
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

Based on the evidence theory, combing with gray correlation and information entropy theory, a new method is proposed for machinery fault diagnosis. Firstly, based on information entropy feature of machinery fault, it builds the standard feature vectors of fault diagnosis. Secondly, the Basic Probability Assignment Function (BPAF) of evidence is built by gray correlation theory, and then a space-time second-level fusion algorithm based on evidence theory is provided, which includes the time domain fusion of single sensor with mutli-measuring period and the space domain fusion of multi-sensor. Finally, a decision-making method based on the basic probability number is used for the fault model recognition. The typical instance of rotational machinery indicates that the new machinery fault diagnosis method is valid and feasible for recognizing fault pattern. ©2010 IEEE.

Yuan L.,Harbin Engineering University
Photonic Sensors | Year: 2011

A brief review of recent progress made in a range of in-fiber integrated interferometers for measuring is presented, with particular attention paid to the multi-core based in-fiber integrated techniques, which have the potential to be exploited in a variety of wide applications. © The Authors(s) 2010.

Yang X.-T.,Harbin Engineering University
Chinese Physics B | Year: 2014

A narrow linewidth continuous wave Ho:YAP laser with two Fabry - Perot etalons pumped by a Tm:YLF laser is reported. The maximum output power reaches 8.3 W when the incident pump power is 15.8 W, with 52.5% optical-to-optical conversion efficiency and 62.6% slope efficiency. A stable laser output at 2118.1 nm is achieved, with a linewidth less than 0.4 nm (full width at half maximum). The beam quality factor is M2 ∼ 1.25, measured by the traveling knife-edge method. © 2014 Chinese Physical Society and IOP Publishing Ltd.

Yang X.-T.,Harbin Engineering University | Yao B.-Q.,CAS Shanghai Institute of Ceramics | Ding Y.,CAS Shanghai Institute of Ceramics | Li X.,Ecole Nationale Superieure de Chimie de Paris | And 3 more authors.
Optics Express | Year: 2013

Holmium doped scandium silicate (Ho:SSO) bulk crystal grown by Czochralski technique is reported. The absorption cross section of 4.8 × 10-21 cm2 at pumping wavelength 1940 nm and emission cross section of 5.56 × 10-21 cm2 at lasing wavelength 2112 nm were calculated, respectively. Lifetime was measured to be 1.51 ms at 300 K and 0.92 ms at 77 K. Continuous-wave laser was operated by using a diode-pumped Tm:YAP laser as pump source with central wavelength of 1940 nm. Output power of 385 mW at 2112 nm was primarily obtained.©2013 Optical Society of America. © 2013 Optical Society of America.

Wang C.,China Ship Development And Design Center | Wang S.,China Ship Development And Design Center | Wang H.,China Ship Development And Design Center | Gao P.,Harbin Engineering University
Annals of Nuclear Energy | Year: 2014

The effect of additional inertial forces on the flow rate pulsation in rolling motion condition is theoretically and experimentally studied, and the essential influencing factors that affect the flow pulsation behavior are clarified. Both the theoretical and experimental results indicate that the relative pulsation amplitude of flow rate increases with the driving head increasing, however, it decreases with the increase of experimental loop friction resistance. Furthermore, the investigation results also indicate that the effect of additional inertial force can be neglected and the flow rate will not present significant pulsation when the intensity of driving force is 10 times larger than the additional inertial force. The pulsation intensity of flow rate in rolling motion condition depends on the relative quantity of driving head, friction resistance and additional inertial acceleration. © 2013 Published by Elsevier Ltd. All rights reserved.

Shi J.,Harbin Engineering University | Shi J.,University of Southampton | Fang X.,University of Southampton | Rogers E.T.F.,University of Southampton | And 4 more authors.
Optics Express | Year: 2014

It was recently demonstrated that the well-known Snell's law must be corrected for phase gradient metasurfaces to account for their spatially varying phase, leading to normal and anomalous transmission and reflection of light on such metasurfaces. Here we show that the efficiency of normal and anomalous transmission and reflection of light can be controlled by the intensity or phase of a second coherent wave. The phenomenon is illustrated using gradient metasurfaces based on V-shaped and rectangular apertures in a metal film. This coherent control effect can be exploited for wave front shaping and signal routing. © 2014 Optical Society of America.

Ji Q.,Huainan Normal University | Lu Y.,Harbin Engineering University
International Journal of Bifurcation and Chaos | Year: 2013

Oscillatory patterns in a one-pool model with Ca2+-activated IP3 degradation are presented and classified, based on fast/slow dynamical analysis and two-parameter bifurcations. The whole parameter space can be partitioned into two parts, that is, the oscillatory and rest regions. For this purpose, we perform the continuation of fold bifurcation, Hopf bifurcation and saddle-node bifurcation of limit cycles, respectively. Several distinct topological types of complex intracellular Ca2+ oscillations (especially bursting) are investigated in the oscillatory area. The classification and transition of different types of Ca2+ oscillations may offer a possible explanation for the differences in dynamic behavior observed in real cells in response to different levels of stimulation. © 2013 World Scientific Publishing Company.

Su X.,Key Laboratory of Dependable Service Computing | Su X.,Chongqing University | Wu L.,Harbin Institute of Technology | Shi P.,Harbin Engineering University | And 3 more authors.
IEEE Transactions on Fuzzy Systems | Year: 2015

In this paper, the model approximation problem is investigated for a Takagi-Sugeno fuzzy switched system with stochastic disturbance. For a high-order considered system, our attention is focused on the construction of a reduced-order model, which not only approximates the original system well with a Hankel-norm performance but translates it into a lower dimensional fuzzy switched system as well. By using the average dwell time approach and the piecewise Lyapunov function technique, a sufficient condition is first proposed to guarantee the mean-square exponential stability with a Hankel-norm error performance for the error system. The model approximation is then converted into a convex optimization problem by using a linearization procedure. Finally, simulations are provided to illustrate the effectiveness of the proposed theory. © 2014 IEEE.

Jia L.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2014

To overcome the complexity of low-carbon service industry competitiveness evaluation factors and evaluation methods, by drawing on theories and methods of assessing the competitiveness of low-carbon service industry, combining the basic theory of the Balanced Scorecard, based on low-carbon service industry Gathering process and output performance characteristics, build the five dimensions low-carbon service industry competitiveness evaluation index system and evaluation model based on extension theory, including theoretical models of low-carbon service industry competitive evaluation, construction, evaluation index system, index weight designing. Finally using empirical data analysis the evaluation system and evaluation model, the result shows that the model can overcome defects of most methods needed to build large data and has good applicability in low-carbon service industry competitiveness evaluation.

Zhu X.,China University of Petroleum - Beijing | Ning G.,China University of Petroleum - Beijing | Ma X.,China University of Petroleum - Beijing | Fan Z.,Harbin Engineering University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2013

Here, we report a novel Co3O4-graphene hybrid electrode material with high density Co3O4 nanoparticles (NPs) in a size range of 2-3 nm confined in a few-layered porous graphene nanomesh (PGN) framework driven by an electrochemical process. Raman spectra indicate that Co species preferentially anchor on the defective sites of the PGN, which results in markedly reduced irreversible Li storage and therefore significantly enhanced coulombic efficiency. The ultra-small Co 3O4 NPs provide a large surface area and a short solid-state diffusion length, which is propitious to achieving a high Li ion capacity at high rate. Also, the few-layered graphene network with high electronic conductivity not only permits easy access to the high surface area of the Co3O4 NPs for the electrolyte ions, but also serves as a reservoir for high capacity Li storage. As a result, the Co 3O4-PGN composite layers deliver an ultra-high capacity (1543 mA h g-1 at 150 mA g-1) and excellent rate capability (1075 mA h g-1 at 1000 mA g-1) with good cycling stability. This journal is © The Royal Society of Chemistry.

Zhang X.,Harbin Engineering University
Proceedings - 5th International Conference on Internet Computing for Science and Engineering, ICICSE 2010 | Year: 2011

An Improved algorithm for image recognition, called Mahalanobis Distance Metric based Laplacian Mapping Algorithm(MLMA), is presented in this paper. Firstly MLMA learns a Mahalanobis metric matrix from training samples, then we use the Mahalanobis metic as a similarity measure in Laplacian Mapping Algorithm. Comparison of MLMA and standard Laplacian Mapping Algorithm in ORL and USPS databases proves that MLMA is more effective and robust than standard Laplacian Mapping Algorithm. © 2010 IEEE.

Zhang K.,Harbin Engineering University | Ren N.-Q.,Harbin Institute of Technology | Wang A.-J.,Harbin Institute of Technology
International Journal of Hydrogen Energy | Year: 2014

Five individual pretreatment methods (heat, ultrasonic, ultraviolet, acid, and base) were performed on two typical seed sludges (river sediments and anaerobic granular sludge) to evaluate their effectiveness on enriching efficient hydrogen (H2)-producing bacteria and enhancing H 2 production using corn stover hydrolyzate. Results indicated that pretreatment processes caused more remarkable improvements for river sediments than anaerobic granular sludge. Among the five protocols, heat pretreatment reached high H2 yield for both river sediments (4.17 mmol H 2/g utilized sugar) and anaerobic granular sludge (2.84 mmol H 2/g utilized sugar). Ultraviolet and ultrasonic pretreatments were conditionally effective for river sediments and anaerobic granular sludge, respectively. In most cases, pretreatment processes altered soluble metabolites distribution towards more acetate and less ethanol production. Microbial community analysis indicated that heat and ultrasonic pretreatments can respectively lead to significant and indistinctive change on original microbial community. Besides frequently detected Escherichia spp., Serratia spp., and Klebsiella spp., some species of Clostridium spp. and Bacillus spp. might be efficient H2 producer responsible for better H2-producing performances. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Guo X.,Harbin Engineering University | Liu L.,Harbin Institute of Technology | Liu Y.,Harbin Institute of Technology | Zhou B.,China University of Petroleum - East China | Leng J.,Harbin Institute of Technology
Smart Materials and Structures | Year: 2014

Recently, increasing applications of shape memory polymers have pushed forward the development of appropriate constitutive models for smart materials such as the shape memory polymer. During the heating process, the phase transition, which is a continuous time-dependent process, happens in the shape memory polymer, and various individual phases will form at different configuration temperatures. In addition, these phases can generally be divided into two parts: the frozen and active phase (Liu Y et al 2006 Int. J. Plast. 22 279-313). During the heating or cooling process, the strain will be stored or released with the occurring phase transition between these two parts. Therefore, a shape memory effect emerges. In this paper, a new type of model was developed to characterize the variation of the volume fraction in a shape memory polymer during the phase transition. In addition to the temperature variation, the applied stress was also taken as a significant influence factor on the phase transition. Based on the experimental results, an exponential equation was proposed to describe the relationship between the stress and phase transition temperature. For the sake of describing the mechanical behaviors of the shape memory polymer, a three-dimensional constitutive model was established. Also, the storage strain, which was the key factor of the shape memory effect, was also discussed in detail. Similar to previous works, we first explored the effect of applied stress on storage strain. Through comparisons with the DMA and the creep experimental results, the rationality and accuracy of the new phase transition and constitutive model were finally verified. © 2014 IOP Publishing Ltd.

Lin J.,Harbin Engineering University
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

The energy which has a close relation with the national economy and the people’s livelihood is always a world-wide attention issues. Alternative fuel vehicle industry belongs to the emerging industry, its development in China is just in the initial stage from aspects of technical, market, industry competitiveness and the policy, facing a lot of uncertainties, therefore, it is very important to study the risk of alternative fuel vehicle industry. Basing on the relevant researches, this paper put forward a kind of FIR analysis model (Factor - Interaction - Risk - Model) for analysis the risk formation mechanism of alternative fuel vehicle industry, in order to further analyze the risk evolution path. © Sila Science. All rights reserved.

Xu G.D.,Harbin Engineering University | Wu G.X.,University of London
Engineering Analysis with Boundary Elements | Year: 2013

The dynamic performance of a rigid foil with harmonic vertical and rotational motions in fluid flow has been studied through velocity potential theory. A boundary element based time stepping scheme is introduced to simulate the flow around the foil and the vortex wake. The body surface condition is satisfied on the exact foil surface and the motion and deformation of the wake sheet shed at the trailing edge is tracked. Kelvin condition is satisfied and a Kutta condition for the unsteady motion is proposed to circumvent the singularity at the trailing edge. Point vortex, which is reduced from wake vortex dipole, is introduced to approximate the vorticity. The performance of foil NACA0012 with harmonic vertical and rotational motions are studied extensively; the propulsion/swimming mode, energy harvesting mode and the flying mode are analysed in detail. © 2013 Published by Elsevier Ltd.

Xiao Q.,University of Strathclyde | Sun K.,Harbin Engineering University | Liu H.,Chiba University | Hu J.,University of Strathclyde
Ocean Engineering | Year: 2011

We present a numerical study on the hydrodynamic performance of undulation NACA0012 foil in the near wake of D-section cylinder. Computations are conducted using unsteady incompressible NavierStokes equations with a moving adaptive mesh based on laminar flow. Investigations are focused on the effect of distance ratio between foil tip and centre of cylinder (L/D≤2.0) on the thrust/drag performance of foil and cylinder at various foil undulation frequency (St). We found that, foil thrust coefficient (Ct) increases considerably with the appearance of cylinder and an optimal distance exists at which Ct reaches maxima. The maximum increment is about eleven times that of its counterpart of single foil, which is obtained at St=0.23 and L/D=0.5. Our results for the cylinder drag coefficient (Cd) observed the existence of optimal parametric map, combined with various gap ratios and foil frequencies. With these parameters, insertion of an undulation foil can significantly lead to the drag reduction indicating that undulating foil could work efficiently as a passive vortex control device for cylinder drag reduction. © 2011 Elsevier Ltd.

Ishitake K.,Nagoya University | Satoh K.,Nagoya University | Kamigaito M.,Nagoya University | Okamoto Y.,Nagoya University | Okamoto Y.,Harbin Engineering University
Macromolecules | Year: 2011

A series of silyl methacrylates [CH2=C(CH3)CO 2SiR3] with varying silyl group bulkiness [R 3Si: Me3Si, Et3Si, Me2tBuSi, iPr3Si, Ph2tBuSi, Ph3Si, and (Me 3Si)3Si] were synthesized and radically polymerized to efficiently give soluble polymers with the exception of the highly bulky tris(trimethylsilyl)silyl methacrylate (TTMSSMA), which resulted in insoluble polymers. All the polymers can easily be converted into poly(methacrylic acid) (PMAA) via acid- or fluoride-induced deprotection of the silyl groups and further into poly(methyl methacrylate) (PMMA) via methylation with trimethylsilyldiazomethane for the analysis of molecular weight and tacticity. The tacticity was dependent on the bulkiness of the silyl substituents; the isotacticity increased with increasing bulkiness. Thus, a series of PMAAs and PMMAs with various tacticities ranging from syndiotactic-rich (rr = 74%; Me 2tBuSi) to atactic (mr = 50%; iPr3Si) and highly isotactic [mm = 93%; (Me3Si)3Si] enchainment were obtained by conventional radical polymerization of silyl methacrylates followed by simple postreactions. The high isotacticity and insolubility of poly(TTMSSMA) suggested the formation of helical polymers as in the polymerization of similarly bulky triarylmethyl methacrylate. Reversible addition-fragmentation chain-transfer (RAFT) polymerization also worked for these silyl methacrylates, which resulted in well-defined polymers with controlled molecular weights and various tacticities. RAFT polymerization was further applied to the synthesis of novel stereoblock polymers, such as stereo-triblock PMAA and PMMA that consisted of syndiotactic-rich, atactic, and isotactic stereogradient segments. © 2011 American Chemical Society.

Zheng Y.H.,Harbin Engineering University
Superlattices and Microstructures | Year: 2010

Because it is too difficult to pick out the needed structures from the vast possible configurations, complex superlattices have not been studied well for a long time. In this paper, an inverse band structure (IBS) approach which combined genetic algorithm search method with an empirical spds* tight-binding energy band calculation to address this problem is presented. Needed direct energy band gaps of Ga(Al)As complex superlattices are found by using this approach. It can be found that the band gap value can be same for different superlattice structures, but other properties of these complex superlattices could be different. © 2010 Elsevier Ltd. All rights reserved.

Yang X.,Harbin Engineering University | Yang X.,National University of Singapore | Low J.M.W.,National University of Singapore | Tang L.C.,National University of Singapore
Journal of Transport Geography | Year: 2011

This paper presents an intermodal network optimization model to examine the competitiveness of 36 alternative routings for freight moving from China to and beyond Indian Ocean. The proposed model, which is built upon the principles of goal programming, is able to handle multiple and conflicting objective functions such as minimizing transportation cost, transit time and transit time variability while ensuring flow continuity and transit nodes compatibility among the rail, road, ocean vessel, airplane and inland waterway transports. Transportation time and cost obtained from comprehensive industry sources are then fed into the intermodal transport network connecting two important Chinese origins and four Indian destinations, from which the most attractive routes are identified. In addition, the paper investigates several non-dominated transportation cases through sensitivity analysis tests, and analyzes the potential competitiveness and possible influences of future route developments to current transportation patterns in Asia. © 2010 Elsevier Ltd.

Meng F.-S.,Harbin Engineering University
Kongzhi yu Juece/Control and Decision | Year: 2015

According to the dual cost control standard, the employees are classified, the enterprise and employees are treated as the players participating income distribution game, which are considered to be all rational people in the choice of income distribution strategies and can choose the strategies to make their own benefits maximization. On this basis of information advantages of the enterprise in the income distribution, the game model of enterprise income distribution signal under dual cost control standard is established, the possible four kinds of equilibrium results and conditions are proposed. It is pointed out that when employees ensure income is just equal to expectation and enterprise provides high payment scheme, the most efficiency separating equilibrium will appear, while other three results are not the most efficiency equilibrium. ©, 2015, Northeast University. All right reserved.

Ning G.,China University of Petroleum - Beijing | Xu C.,China University of Petroleum - Beijing | Cao Y.,China University of Petroleum - Beijing | Zhu X.,China University of Petroleum - Beijing | And 5 more authors.
Journal of Materials Chemistry A | Year: 2013

We present a novel approach to fabricate flexible graphene papers using chemical vapor deposition (CVD) derived graphene. Expanded vermiculite was used as a layered template in the CVD process to produce bulk materials containing graphene sheets of the order of hundreds of microns at a gram scale. Meshes or carbon nanotubes can be introduced into the graphene sheets by template pretreating. Owing to the large sheet size, the as-obtained graphene sheets were easily fabricated into flexible graphene papers with low surface density and good conductivity, which exhibited greatly enhanced reversible capacity (1350 mA h g-1 at 50 mA g-1) and cycling performance as anodes for lithium rechargeable batteries as compared to the graphene papers fabricated using reduced graphene oxide. © 2013 The Royal Society of Chemistry.

Dong H.,Beijing University of Chemical Technology | Cheng M.,Beijing University of Chemical Technology | Zhang Y.,Beijing University of Chemical Technology | Wei H.,Harbin Engineering University | Shi F.,Beijing University of Chemical Technology
Journal of Materials Chemistry A | Year: 2013

We have fabricated a self-cleaning coating on a model ship with a large and curved surface by electroless deposition of gold aggregates, and the superhydrophobic model ship exhibited a remarkable drag reduction of 38.5% at a velocity of 0.46 m s-1. The as-prepared coating exhibits excellent superhydrophobic properties, with a contact angle as high as 159.7°. To rule out the influence of wetting area differences between superhydrophobic coated materials and normal materials, we modified the large curved surface of a model ship with the self-cleaning coating and investigated its drag reducing properties at high speed. The results showed that the superhydrophobic coating took effect in reducing drag; the mechanism of the drag reduction is discussed based on the plastron effect and Newton's law of viscosity. © The Royal Society of Chemistry 2013.

Deng C.,Harbin Normal University | Zhang S.,Harbin Engineering University | Dong Z.,Harbin Normal University | Shang Y.,Harbin Normal University
Nano Energy | Year: 2014

1D nanostructured sodium vanadium oxide, i.e. Na2V6O16·nH2O, was introduced as a novel anode material for aqueous sodium ion batteries. A simple hydrothermal method is employed to prepare bundles of straight nanobelts whose crystals grow along the (010) direction. In each bundle, most nanobelts are aligned along the same direction. Sodium vanadium oxide hydrate has a layered structure, and that sodium ions are located at the interstices between layers. The solid-state diffusion coefficient of sodium ion in the bulk of Na2V6O16·nH2O is in the order of magnitude of 10-14cmS-1. The discharge/charge capacity fades quickly in the initial few cycles upon galvanostatic cycling. It is revealed by ex-situ XRD analyses that this fast capacity fading can be attributed to the irreversible phase transition which mainly occurs in the first discharge. A full aqueous sodium ion battery was built using Na2V6O16·nH2O as anode and Na0.44MnO2 as cathode. Although its charge capacity fades quickly in the initial few cycles and stabilizes in the following cycles, its discharge capacity is comparatively stable upon cycling. © 2014.

Wang Y.,Harbin Engineering University
Electronics, Communications and Networks IV - Proceedings of the 4th International Conference on Electronics, Communications and Networks, CECNet2014 | Year: 2015

Based on the principle of Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM), the traditional demodulation method and diversity combining demodulation method are analyzed. Under atmospheric turbulence, the BER performances of ACO-OFDM communication system with two demodulation methods are compared. The results show that the BER performance can be improved significantly through diversity combining demodulation method in weak turbulence, and the best value of combining coefficient is 0.35. However, under strong turbulence, the BER performances of ACO-OFDM communication system with two demodulation methods are similar, namely diversity combining demodulation method is not suitable for strong turbulence. © 2015 Taylor & Francis Group, London.

Deng C.,Harbin Normal University | Zhang S.,Harbin Engineering University | Wu Y.,Harbin Normal University
Nanoscale | Year: 2015

Both high safety and low cost give aqueous rechargeable sodium-ion batteries (ARSB) the opportunity for application in stationary energy storage, but the low operating potential of the existing cathode materials limits its energy density. Here, we introduce a hydrothermal-assisted strategy to prepare the Na7V4(P2O7)4(PO4)/C nanorod and employ it as a novel high-property cathode material for ARSB. The hierarchical structure is formed by direct in situ carbonization of the surfactants (CTAB and oxalic acid) along with the crystallization of Na7V4(P2O7)4(PO4). The prepared Na7V4(P2O7)4(PO4) with a well-defined 1D nanostructure and uniform particle size is wrapped with a thin carbon layer. For the first time, its sodium intercalation chemistry in an aqueous electrolyte was investigated. Based on the reversible phase transformation and high sodium diffusion coefficient, it is demonstrated to be reliable in an aqueous electrolyte with the rapid ion transport capability. A pair of redox plateaus is observed in the charge and discharge curves at 0.961 and 0.944 V (vs. SCE) respectively with the capacity of 51.2 mA h g-1 at 80 mA g-1. Favored by the open ion channel and 1D morphology, the composite exhibits superior high rate capability and 72% of the capacity remains at 1000 mA g-1. The results not only demonstrate a high-property cathode material for ARSB, but also are helpful for design and synthesis of mixed-polyanion electrode materials with tailored architecture. This journal is © The Royal Society of Chemistry.

Liao Y.,Harbin Engineering University
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2015

To handle the difficult task of setting the relative parameters properly in the research and application of Pulse Coupled Neural Networks (PCNN), an improved PCNN algorithm is proposed. It uses the maximum between-cluster variance function as the fitness function of bacterial foraging optimization algorithm, and adopts bacterial foraging optimization algorithm to search the optimal parameters, and eliminates the trouble of manually setting the experiment parameters. Experimental results show that the proposed algorithm can effectively complete document image segmentation, and result of the segmentation is obviously better than the contrast algorithms. © 2015, Harbin Institute of Technology. All right reserved.

Zhang J.,University of New South Wales | Zhang J.,Harbin Engineering University | Sathi Z.M.,University of New South Wales | Luo Y.,University of New South Wales | And 2 more authors.
Optics Express | Year: 2013

We demonstrate a broadband optical emission from Bi/Er codoped fiber and a single 830nm laser diode pump. The ultra-broadband mechanism is studied and discussed in details based on a combination of experimental measurements, including luminescence, differential luminescence and ESA, on fiber samples of different Bi and Er concentrations. The Er co-doping in Bi doped fiber is found to be effective for broadband emission, by enhancing not only luminescence at C and L bands but also that at O and shorter wavelength bands. The luminescence intensity between 1100 and 1570nm is over -45dBm/5nm in single mode fiber using a few meters of Bi/Er co-doped fiber and offers a modest ~40dB dynamic range and a broad bandwidth of ~470nm for an OSA based spectral measurement. © 2013 Optical Society of America.

Zhao D.,Tokyo Institute of Technology | Zhao D.,Harbin Engineering University | Lim C.-P.,Tokyo Institute of Technology | Miyanaga K.,Tokyo Institute of Technology | Tanji Y.,Tokyo Institute of Technology
Applied Microbiology and Biotechnology | Year: 2013

Microbial activities in brine, seawater, or estuarine mud are involved in iodine cycle. To investigate the effects of the microbiologically induced iodine on other bacteria in the environment, a total of 13 bacteria that potentially participated in the iodide-oxidizing process were isolated from water or biofilm at a location containing 131 μg ml-1 iodide. Three distinct strains were further identified as Roseovarius spp. based on 16 S rRNA gene sequences after being distinguished by restriction fragment length polymorphism analysis. Morphological characteristics of these three Roseovarius spp. varied considerably across and within strains. Iodine production increased with Roseovarius spp. growth when cultured in Marine Broth with 200 μg ml -1 iodide (I-). When 106 CFU/ml Escherichia coli, Pseudomonas aeruginosa, and Bacillus pumilus were exposed to various concentrations of molecular iodine (I2), the minimum inhibitory concentrations (MICs) were 0.5, 1.0, and 1.0 μg ml-1, respectively. However, fivefold increases in the MICs for Roseovarius spp. were obtained. In co-cultured Roseovarius sp. IOB-7 and E. coli in Marine Broth containing iodide (I-), the molecular iodine concentration was estimated to be 0.76 μg ml-1 after 24 h and less than 50 % of E. coli was viable compared to that co-cultured without iodide. The growth inhibition of E. coli was also observed in co-cultures with the two other Roseovarius spp. strains when the molecular iodine concentration was assumed to be 0.52 μg ml-1. © 2012 Springer-Verlag.

Zheng Y.H.,Harbin Engineering University
Superlattices and Microstructures | Year: 2010

Complex superlattice, i.e. with a period consisting of more than two different layers has generated intense interest since the discovery of the superlattice. But since there are too many configurations to pick out the needed one, and for the limit of crystal growth technique, they were not well studied. In this paper, based on an empirical spds* tight-binding model, electronic and optical properties of complex superlattices are calculated. Useful empirical parameters corresponding to the congregation of one kind of cations are defined. The energy bands, especially the lowest conduction band and the top of the valence band, have a simple trend with the change of the empirical parameter. Type-I to type-II transition problems are also discussed in this paper. © 2010 Elsevier Ltd. All rights reserved.

Ren B.,Key Laboratory of Superlight Materials and Surface Technology | Fan M.,Key Laboratory of Superlight Materials and Surface Technology | Liu Q.,Key Laboratory of Superlight Materials and Surface Technology | Wang J.,Key Laboratory of Superlight Materials and Surface Technology | And 3 more authors.
Electrochimica Acta | Year: 2013

NiO nanofibers modified by citric acid (NiO/CA) for supercapacitor material have been fabricated by electrospinning process. The characterizations of the nanofibers are investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. Results show that the NiO/CA nanofibers are hollow tube and comprised of many NiO sheets. Furthermore, the NiO/CA nanofibers have good electrochemical reversibility and display superior capacitive performance with large capacitance (336 F g-1), which is 2.5 times of NiO electrodes. Moreover, the NiO/CA nanofibers show excellent cyclic performance after 1000 cycles. © 2013 Elsevier Ltd.

Sha L.S.,Harbin Engineering University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

The intelligent vehicle is an important area country in recent years of painstaking research in Intelligent Transportation System, which become the focus of the study, based on the visual structure of the road environment recognition. Aiming at the robust and real time problems of lane detection in the visual navigation system of intelligent vehicles, a robust lane detection method is proposed for the structured road. It can provide for intelligent vehicle automatically to maintain lane and changing lanes traveling lane information necessary to make smart vehicle to achieve a smooth, safe driving. Due to the complexity of the road itself, the complexity of the road image, Therefore, the pre-road established certain assumptions and these assumptions and the detection algorithm is combined to further improve the algorithm efficiency. Simulation test of the collected road images results show that the lane detection method designed in this study is stable enough to show the lane Position for engineering application not matter in good or poor illumination road condition. © Maxwell Scientific Organization, 2013.

Tang H.,Harbin Engineering University | Tang H.,University of Idaho | Pesic B.,University of Idaho
Electrochimica Acta | Year: 2014

The electrochemistry of ErCl3 dissolved in molten LiCl-KCl eutectic salt was studied in the temperature range 683-813 K by using inert electrodes, Mo as the working electrode, and high density graphite as the counter electrode. The erbium redox reaction was evaluated with respect to its major thermodynamic, kinetic and initial electrocrystallization properties. The reduction of Er(III) ions to Er(0) metal occurred in a single reaction step. For each temperature, the equilibrium potential of Er(III)/Er(0) redox couple was determined by using open-circuit chronopotentiometry, with subsequent calculation of the apparent standard potential, EEr(III)/Er(0)*0, and the apparent Gibbs energy, ΔGErCl3*0. The activity coefficients for ErCl3, γErCl3, was determined from the difference of apparent and standard Gibbs energies of formation, ΔGErCl3*0-ΔGErCl3(Sc)0. According to temperature dependence of diffusion coefficient, determined at five different temperatures from the Sand's equation plots, the diffusion of Er(III) ions required the activation energy of 40.8 ± 1.4 kJ·mol-1. The exchange current density of Er(III)/Er(0) redox reaction, at three different temperatures, was evaluated by linear polarization of Mo electrode coated with erbium. The reaction rate constant determined by convolutive voltammetry shows that Er(III)/Er(0) redox system is quasi-reversible per Matsuda-Ayabe criteria. This study clearly shows that the actual mechanisms of erbium nucleation and growth are not even close to 3D-hemispherical mechanisms proposed in the literature on the basis of popularly used mathematical model of Scharifker-Hill. Actually, on molybdenum substrate, erbium nucleates by clustering of adatoms into morphology resembling dendrites organized into circular shapes, as was found for lanthanum. What distinguishes erbium from lanthanum is the growth stage. For erbium, the growth continues by filling-in the empty space in a circle. Further growth of either individual, or merged circles, is peripheral. The net result is a smooth, densely packed, very thin film of erbium. © 2014 Elsevier Ltd.

Ru C.,Harbin Engineering University | Ru C.,Soochow University of China | To S.,University of Toronto
Ultramicroscopy | Year: 2012

Nanomanipulation systems require accurate knowledge of the end-effector position in all three spatial coordinates, XYZ, for reliable manipulation of nanostructures. Although the images acquired by a scanning electron microscope (SEM) provide high resolution XY information, the lack of depth information in the Z-direction makes 3D nanomanipulation time-consuming. Existing approaches for contact detection of end-effectors inside SEM typically utilize fragile touch sensors that are difficult to integrate into a nanomanipulation system. This paper presents a method for determining the contact between an end-effector and a target surface during nanomanipulation inside SEM, purely based on the processing of SEM images. A depth-from-focus method is used in the fast approach of the end-effector to the substrate, followed by fine contact detection. Experimental results demonstrate that the contact detection approach is capable of achieving an accuracy of 21.5. nm at 50,000× magnification while inducing little end-effector damage. © 2012 Elsevier B.V.

Yuan W.,Kyung Hee University | Guan D.,Harbin Engineering University | Lee Y.-K.,Kyung Hee University | Lee S.,Kyung Hee University
Applied Intelligence | Year: 2011

The topology of the trust network is important to optimize its usage in the trust-aware applications. However, since the users can join trust network ubiquitously, the structure of the highly dynamic trust network is still unknown. This paper contributes to verify that the trust network is the small-world network, and its small-world topology is independent of its dynamics. This is achieved by verifying the scale-freeness of five trust networks extracted from real online sites. Using the small-world nature of the trust network, we optimize the rating prediction mechanism of the conventional trust-aware recommender system. Experimental results clearly show that our proposed mechanism can achieve the maximum accuracy and coverage with the minimum computation complexity for the rating predictions. © Springer Science+Business Media, LLC 2010.

Zhu X.,Zhejiang GongShang University | Yuan L.,Harbin Engineering University
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2011

An effective linking and coupling method for single core single mode fiber (SMF) and capillary optical fiber is proposed. Two types of capillary optical fiber which have different structures are investigated. By splicing and tapering at the fusion point of single mode fiber and capillary optical fiber, an effective bi-tapered fiber coupling technique is implemented. The coupling mechanism and the transmission properties are studied and compared. The theoretical prediction is confirmed by the experimental results. The coupling approach is simple and efficiency.

Yuan L.,Harbin Engineering University
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

Fiber optic white-light interfreometry is one of the unique measurement and sensing technology in the fiber optic research field. It is one of typical achievement application branches of fiber optic multidisciplinary research, such as broad-band light coherence characteristics, high precision deformation absolute measurement, waveguides components structures and reflectivity properties testing, cross-coupling between polarization states evaluation for fiber optic gyro, as well as low-coherence tomography technology for tissue and clinical diagnosis in medicine. A brief description about the white-light interfreometry and its development in the past several tens years is given. From the view of demands of market and the intrinsic rules of the technology development, the driving dynamics mechanisms of the technique is analyzed. Finally, the developing trend and forecast of this technology is pointed out.

Yang X.,Harbin Engineering University
Eurasip Journal on Advances in Signal Processing | Year: 2011

Fingerprint smear detection has become a challenging issue due to the erratic texture of the smear tissue and its similarity to normal finger area. This paper presents a novel fingerprint image smear detection approach integrating symmetric wavelet transform (SWT), gray level co-occurrence matrix, and DCT. A feature extraction algorithm is first proposed by utilizing SWT to decompose each fingerprint and characterizing local texture features of defective finger tissue with the SWT coefficients in subbands 419. Concurrence matrix-based texture features are incorporated into the feature vector to further improve the texture classification sensitivity. The concatenated feature vector is then fed into a pretrained genetic neural network classifier, which identifies smears by labeling fingerprint subblocks into different categories. Finally, DCT decomposition is used to detect abnormalities in fingerprint images containing small smear areas and abrupt breakages. Experimental results indicate that the hybrid method can effectively identify various types of fingerprint smears. © 2011 Xiukun Yang.

Cao Y.,CAS Changchun Institute of Applied Chemistry | Cao Y.,University of Chinese Academy of Sciences | Cai N.,CAS Changchun Institute of Applied Chemistry | Cai N.,University of Chinese Academy of Sciences | And 4 more authors.
Physical Chemistry Chemical Physics | Year: 2012

Through elongating the end or side alkyl chains of dye molecules, we decorate anatase nanocrystals with a thicker organic assembly featuring a smaller tilt angle of the D-π-A backbone with respect to the surface normal, which retards the interfacial charge recombination and confers a higher photovoltage output on mesoscopic cobalt solar cells displaying an over 10% power conversion efficiency at the AM1.5G conditions. © 2012 the Owner Societies.

Ke T.,CAS Shanghai Advanced Research Institute | Zheng Q.,Harbin Engineering University
Nuclear Engineering and Design | Year: 2012

A design study of multistage axial helium compressor of a 300 MWe high temperature gas-cooled reactor is presented in this paper. Helium compressor is characterized by shorter blades, narrow flow channels, numerous stages and longer slim rotor, which result in losses due to blade surface and end wall boundary layers growths, secondary flows and clearance leakage flows, any occurrence of flow separation and stage mismatch. Therefore, the purpose of this paper is to improve and optimize the aerodynamic design of helium compressor. The property of helium is different from that of air, so how to choose the design parameters of a helium compressor is discussed first. And then how to shorten the axial length of the helium compressor or how to decrease the number of stages for a certain pressure ratio by increasing the stage loading are investigated. The new highly loaded helium compressor of larger flow coefficient and high reaction is designed and optimized. Three-dimensional flow patterns in a helium stage are simulated with CFD software (NUMECA). Adjusting the position of blade maximum camber deflection position; redistributing radial compression work; 3D blading techniques, such as distribution spanwise relative airfoil thickness, custom tailoring airfoils and bowed stator vane to mitigate end wall boundary layers and corner separation have improved the aerodynamic performance of the first stage of helium compressor. © 2012 Elsevier B.V.

Du H.,Chongqing Jiaotong University | Shi P.,Harbin Engineering University | Shi P.,Victoria University of Melbourne | Shi P.,University of Adelaide
Nonlinear Dynamics | Year: 2016

This paper investigates the problem of modified function projective synchronization of two different chaotic systems in the presence of parametric uncertainties and external disturbances. A new robust adaptive control is proposed, which is able to attenuate all random uncertainties of the drive and response systems. Moreover, there is no need to know the norm-bounds of all random uncertainties, and the compensator gains can be automatically adapted to suitable constants. Numerical examples are provided to show the effectiveness of the proposed method. © 2016, Springer Science+Business Media Dordrecht.

Fedotov V.A.,University of Southampton | Tsiatmas A.,University of Southampton | Shi J.H.,University of Southampton | Shi J.H.,Harbin Engineering University | And 5 more authors.
Optics Express | Year: 2010

Losses are the main evil that limits the use of metamaterials in practical applications. While radiation losses may be controlled by design, Joule losses are hereditary to the metamaterial structures. An exception is superconducting metamaterials, where Joule losses can be uniquely controlled with temperature in a very wide range. We put this in use by demonstrating temperature-dependent transmission in the millimeter-wave part of the spectrum in high-Tc superconducting cuprate metamaterials supporting sub-radiant resonances of Fano type. © 2010 Optical Society of America.

Chen T.,Harbin Engineering University
Archive of Applied Mechanics | Year: 2013

The flexural wave propagation in a periodic beam with a propagating disturbance is studied by the use of the multi-reflection method. A propagating wave is incident upon a discontinuity and gives rise to transmitted and reflected waves. Here all of the transmitted and reflected waves of given flexural wave incident upon the beam at some specified location are found and superposed, and the method is extended to the case of incident evanescent wave. The results of incident waves at some location between discontinuities in a periodic beam are concerned. The relation between the wave-field of incident waves and the wave-field of resulting waves on any segments is expressed. As an example, the application of the results to the analysis of a finite periodic beam with a propagating disturbance is then demonstrated. The influences of the number of cells on the energy associated with propagating waves are considered. © 2012 Springer-Verlag.

Zhang S.,Harbin Engineering University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2015

A novel field line detection method is proposed based on the directional information of field line. First, the special character of modern soccer playfield is considered, and a novel soccer field model is introduced which includes offside assistant lines. By designing a directional filter, these field lines can be accurately detected. Moreover, the field line detection and tracking for a clip is developed, which can further improve the performance of field line detection. In this paper, we integrate the basic theories of multimedia analysis, pattern recognition and computer vision into content analysis for sports video analysis. Through exploring several components such as object detection, camera calibration and tactic analysis, a systematical system is built up. The proposed algorithms can be not only used for soccer video analysis but also used for other sports video analysis. It provides a promising method for general multimedia analysis. © 2015 SERSC.

Fang G.,Harbin Institute of Technology | Liang J.,Harbin Institute of Technology | Lu Q.,Harbin Institute of Technology | Wang B.,Harbin Engineering University | Wang Y.,Harbin Institute of Technology
Composite Structures | Year: 2011

The compressive mechanical properties of three dimensional (3D) braided composites are of key concern for design in actual engineering application. A representative volume cell (RVC) is chosen to study the uniaxial compressive mechanical properties of the braided composites with different braid angles by combing damage theory and finite element method. The fiber misalignment and longitudinal shear nonlinearity of braid yarn are considered in the computation model. And their influences on the compressive behavior of the braided composites are also evaluated. The damage development of constituents within the braided composites are obtained and analyzed. The main damage and failure modes and their interaction of braid yarn are provided as well. The numerical results are found that the compressive mechanical behavior of the braided composites with lower braid angle is sensitive to the fiber initial imperfection of braid yarn. The strength of the braided composites with different braid angle is controlled by the different microscopic failure modes. © 2010 Elsevier Ltd.

Bing H.,Harbin Engineering University
International Journal of Smart Home | Year: 2016

Based on improving the Entropy Evaluation Method and Er'xiang Dual Theory, this paper firstly divides new energy high-tech industry system into two subsystems: one is status subsystem, based on the representation of innovation ability and another is process subsystem, based on the measurement of innovation efficiency, than makes a further statement on Er'xiang characteristics of new energy high-tech industry according to the subsystems. Finally, this paper carries out a demonstration measurement through the development level of Er'xiang subsystem, the comprehensive development level of whole system, and the coordinated development level of these two subsystems, of the new energy resources systems in Heilongjiang Province of China from 2005 to 2012. The final evidence shows that the comprehensive developments of new energy high-tech industry system and its Er'xiang subsystems of Heilongjiang Province are on an overall fluctuated climbing condition and the degree of coordinated developments of Er'xiang subsystems is also on an overall rising condition. © 2016 SERSC.

Zhang S.,Harbin Engineering University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2015

The strong or the weak of university sports teaching sustainable innovation ability directly relation to the development of national sports, and affect the national competition strength and international status in the international sports competition .Through analyses the influential factors of the university sports teaching sustainable innovation ability , build up university sports teaching sustainable innovation ability of evaluation primary index; Using the GEM to recognized the importance of university sports teaching sustainable innovation ability, build up the Heilongjiang province university sports teaching sustainable innovation ability of evaluation index system, using the AHP to confirm the evaluation index system of the weight of each index, using fuzzy evaluation to evaluate he Heilongjiang province university sports teaching sustainable innovation ability, provide a scientific method and new ideas to measure the Heilongjiang province university sports teaching sustainable innovation ability. © 2015 SERSC.

Ye X.,University of Toronto | Zhang Y.,Georgia Institute of Technology | Ru C.,Harbin Engineering University | Luo J.,Shanghai University | And 2 more authors.
IEEE Transactions on Automation Science and Engineering | Year: 2013

Pick-place of single nanowires inside scanning electron microscopes (SEM) is useful for prototyping functional devices and characterizing nanowires's properties. Nanowire pickplace has been typically performed via teleoperation,which is time-consuming and highly skill-dependent. This paper presents an automated approach to the pick-place of single nanowires. Through SEM visual detection and vision-based motion control, the system automatically transferred individual silicon nanowires from their growth substrate to a microelectromechanical systems (MEMS) device that characterized the nanowires's electromechanical properties. The performance of the nanorobotic pick-up and placement procedures was experimentally quantified. © 2013 IEEE.

Xin Y.,Harbin University of Science and Technology | Xie Z.-Q.,Harbin University of Science and Technology | Yang J.,Harbin Engineering University
Physica A: Statistical Mechanics and its Applications | Year: 2016

With the changing of the habit and custom, people's social activity tends to be changeable. It is required to have a community evolution analyzing method to mine the dynamic information in social network. For that, we design the random walking possibility function and the topology gain function to calculate the global influence matrix of the nodes. By the analysis of the global influence matrix, the clustering directions of the nodes can be obtained, thus the NRW (Non-Homogeneous Random Walk) method for detecting the static overlapping communities can be established. We design the ANRW (Adaptive Non-Homogeneous Random Walk) method via adapting the nodes impacted by the dynamic events based on the NRW. The ANRW combines the local community detection with dynamic adaptive adjustment to decrease the computational cost for ANRW. Furthermore, the ANRW treats the node as the calculating unity, thus the running manner of the ANRW is suitable to the parallel computing, which could meet the requirement of large dataset mining. Finally, by the experiment analysis, the efficiency of ANRW on dynamic community detection is verified. © 2016 Elsevier B.V. All rights reserved.

Wang W.,Luoyang Ship Material Research Institute | Wang W.,Harbin Engineering University | Xu L.,Luoyang Ship Material Research Institute | Li X.,Luoyang Ship Material Research Institute | And 2 more authors.
Corrosion Science | Year: 2014

Microcapsules containing isophorone diisocyanate (IPDI) were used as self-healing additives in the alkyd varnish coatings (AVCs), and their self-healing performance was evaluated in the case of artificial defects on Q235. steel surfaces, using scanning micro-reference electrode technique and Fourier-transform infrared spectroscopy. Comparison of the micromechanical properties between the water-insoluble self-healing products (polyurethanes) and AVCs indicates that the former significantly enhanced the capability of the scratched crevice to successfully endure outer stress. The electrochemical impedance spectroscopy experiments analysed the different stages in the self-healing process. This study successfully demonstrated the self-healing activity of IPDI-AVCs in protecting steel surfaces. © 2013 Elsevier Ltd.

Jiang X.-D.,Harbin Engineering University
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

This paper reviews existing urban water reuse schemes in China including policies, institution, technology and financial practices. Furthermore, the data collected from some water reclamation plants were summarized and the key issues, constraints and development tendency in water reuse were discussed. © 2011 IEEE.

Xie Y.G.,Harbin Engineering University
Advanced Materials Research | Year: 2014

A finite element model ships, for example design test condition of the underwater explosion, selection of explosive package quantity is 1000KG TNT, the explosive location along the direction of the ship with the bow, midship and stern, the angle of attack in three exploded cross section have 90 degrees, 60 degrees, 45 degrees, 30 degrees and 0 degrees. According to the current standard to calculate the ship damage radius, critical radius and safety radius of specific values under the effect of underwater explosion, interpolation calculation and draw the envelope. Analysis shows that the vitality of ships and shock-resistance is not only related to the explosive distance, also related to the attack position. © (2014) Trans Tech Publications, Switzerland.

Gao X.,Nanjing Southeast University | Gao X.,Guilin University of Electronic Technology | Hui Shi J.,Nanjing Southeast University | Hui Shi J.,Harbin Engineering University | And 5 more authors.
Applied Physics Letters | Year: 2013

We present an ultrathin dual-band plasmonic waveguide and frequency splitter experimentally based on designer surface plasmon polaritons (DSPPs) of planar composite periodic gratings. In such planar plasmonic metamaterials, the electromagnetic wave can be tightly confined around an ultrathin metallic grating, and the propagation of DSPPs strongly depends on the dispersion relation determined by the depth of groove. Based on such features, we design and fabricate an ultrathin composite grating to support two DSPP modes, which exhibit low bending loss in the bending surface plasmon polariton (SPP) waveguide. We further propose an ultrathin SPP frequency splitter by adjusting the groove depths of two branches. The experimental results are in good agreement to the numerical simulations. © 2013 AIP Publishing LLC.

Baoquan K.,Harbin Institute of Technology | Chunyan L.,Harbin Engineering University | Shukang C.,Harbin Institute of Technology
IEEE Transactions on Plasma Science | Year: 2011

The permanent-magnet (PM) synchronous motor (PMSM) takes advantages of small capacity, high efficiency, and high power density and have become commonplace in electric-vehicle driving systems. However, the excitation of PMSM cannot be adjusted, which restrains the PMSM from widening the speed range above its base speed. A PMSM with a variable magnetic reluctance field adjustment is presented in this paper. A new structure of the rotor is introduced, and flux-weakening (FW) principle is formulated. Analysis is discussed, including the force on the main PM, the movement process of the PM in the PM slot, the characteristics of the movement of the PM, and the FW performance of the new PMSM used for electric vehicles. The emulation analysis coincides with the test result, which verifies the availability and feasibility of the FW method for this kind of PMSM used for electric vehicles. © 2010 IEEE.

Zhang S.Z.,Harbin Engineering University
Advanced Materials Research | Year: 2014

To provide cognitive psychological evidences in material selection, training and competition for athletes in Chinese women curling, methods include document literature, expert interview, experimental measurement and mathematical statics are employed. Athletes in National women curling team and provincial curling team of Heilongjiang are the main object of this study. In terms of cognitive ability, systematic research of women curling athletes' psychological feature are conducted. Research results show that, women curling athletes at different level have very significant differences in index of attention concentration and significant differences in time perception, depth perception and movement memory; athletes of different training time have very significant differences in index of wrist stability, and female curling athletes are tend to be inferior to their male counterparts in attention focusing. © (2014) Trans Tech Publications, Switzerland.

Jia H.-M.,Harbin Engineering University
Proceedings - 2013 International Conference on Communication Systems and Network Technologies, CSNT 2013 | Year: 2013

Appropriate response of immune system to variety antigen is the key organisms to maintain a stable internal environment. It mainly depends on the regulation of T cell. The function of T cells is both active and inhibitive, which provides immune system with fast response and adequate stabilization. Based on the immune system regulating law and comparison the control system and the immune system, an immune PID controller is proposed in this paper. The effects of parameters of immune PID controller are described. Simulation results obtained for wood drying control system with parameters changing and perturbations demonstrate the effectiveness of the immune PID control system. © 2013 IEEE.

Liu N.,Harbin Engineering University
Advanced Materials Research | Year: 2014

Aluminum Sheets-with-ribs has many advantages. The problems of hull weight and structure strength of ACV have been solved by the application of aluminum sheets-with-ribs. The mechanical properties of different aluminum sheets-with-ribs have been compared in this paper, the finite element modeling method of sheets-with-ribs structure in ACV has been studied, and a simplified and reasonable approach has been proposed. © (2014) Trans Tech Publications, Switzerland.

Khan S.U.-D.,King Saud University | Peng M.,Harbin Engineering University | Khan S.U.-D.,Chongqing University
International Journal of Energy Research | Year: 2013

In this paper, three-dimensional (3D) power distribution of newly designed small nuclear reactor core has been achieved by using neutron kinetic/thermal hydraulic (NK/TH) coupling. This is pressurized water reactor-based small nuclear reactor in which plate type fuel element has been used and the core of the reactor has hexagonal type geometry. This paper depicts the design of the reactor core by using coupling approach of neutronics(Neutron Kinetic) and thermal hydraulic studies. For this purpose, neutronic analysis has been obtained by using lattice physics code, i.e. HELIOS and neutron kinetic code, i.e. REMARK. HELIOS code gives the cross-section data which is being used as input to the REMARK code. At the same time, THEATRe code was used for the thermal hydraulic analysis of the reactor core. In the coupling process, some data (fuel temperature, moderator temperature, void fraction, etc.) from THEATRe code has been used in conjunction with HELIOS and REMARK codes. After finalizing the NK/TH coupling, 3D evaluation of the power distribution of the reactor core has been achieved and is included in the paper. The purpose of this paper is to evaluate the design and get the normal operational behavior of the reactor core by NK/TH coupling approach. © 2012 John Wiley & Sons, Ltd.

Xue X.-Y.,Northeastern University China | Chen Z.-H.,Northeastern University China | Xing L.-L.,Northeastern University China | Ma C.-H.,Northeastern University China | And 2 more authors.
Journal of Physical Chemistry C | Year: 2010

Pt-ZnO nanoflowers are prepared via a novel one-step hydrothermal route, and Pt nanoparticles are uniformly loaded on the whole surface of the nanoflowers. The growth mechanism of Pt-ZnO nanoflowers is proposed to be a four-stage process. With the help of Raman scattering, photoluminescence, and gas sensing measurements, it has been demonstrated that the optical and sensing properties of Pt-ZnO nanoflowers are greatly enhanced. The surface defects decrease, the concentration of bound excitons under UV illumination increases, and the surface adsorption is enhanced and accelerated. These probably arise from the chemical and electrical effect of Pt. Our results could provoke a promising direction to achieve higher optical and sensing properties of ZnO one-dimensional nanostructures. © 2010 American Chemical Society.

Cao J.,Beijing University of Posts and Telecommunications | Gao H.,Harbin Engineering University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

In order to solve discrete optimization problem, this paper proposes a quantum-inspired bacterial swarming optimization (QBSO) algorithm based on bacterial foraging optimization (BFO). The proposed QBSO algorithm applies the quantum computing theory to bacterial foraging optimization, and thus has the advantages of both quantum computing theory and bacterial foraging optimization. Also, we use the swarming pattern of birds in block introduced in particle swarm optimization (PSO). Then we evaluate the efficiency of the proposed QBSO algorithm through four classical benchmark functions. Simulation results show that the designed algorithm is superior to some previous intelligence algorithms in both convergence rate and convergence accuracy. © 2012 Springer-Verlag.

Ru X.,Harbin Engineering University | Staehle R.W.,Nuclear Power Institute of China
Corrosion | Year: 2013

This review assesses past experiences from superheated fossil plants, supercritical fossil plants, superheated nuclear plants, and light water reactors from the late 1940s until the present. Data from the development and operation of these plants are directly applicable to supercritical water reactor (SCWR) plants being developed currently. This past work can be applied to the development of current designs in the choice of materials, temperature dependencies, effects of stress, and effects of environments on materials. Some of the past data from light water reactor (LWR) technology can be extrapolated into the present SCWR regimes. The past data are in good agreement among the various previous investigators. These past data are considered with respect to specific components in SCWR: fuel cladding, reactor structurals, reactor vessels, and feed water heaters. Choosing materials for the SCWR applications must recognize that the materials at nominal outlet temperatures are in a dynamic thermal range, i.e., in the nuclear superheat and fossil superheat range, the atomic structures of materials change significantly and change properties such as ductility. It is also possible that compositions and structures of grain boundaries can change, for example, the susceptibility to SCC. The surface temperatures on fuel cladding will be significantly higher than the outlet temperature, and both temperatures will exceed, substantially, the outlet temperatures of present water-cooled plants. Past isothermal data directed toward core structures may not be relevant to the same alloy as fuel cladding. The outlet temperature is useful for considering core structural materials but not for fuel elements, owing to an inevitably high film drop. SCW environments are expected to produce extensive SCC, which differs from past experience. Finally, past data were reanalyzed and additional useful insights were obtained. © 2013, NACE International.

Zhao G.-W.,Harbin Engineering University
Applied Mechanics and Materials | Year: 2014

This paper seeks to focus on a combined waste (or: wastewater)/energy system in the deep green housing district. An innovative mixture of "red and green" development is presented, together with a concept of building integrated decentralized technologies for wastewater and organic waste treatment with energy and nutrients recovery. The concept is called sustainable implant. It is important to change the general attitude towards the different components of design, development, use and management of urban areas. A way to do so is the "interconnection" of different themes and cycles within cities. An example is the linking of sanitation to energy and food production. The paper shows the potentials of integrating solutions concerning energy and sanitation flows as near as possible to its origin of use and/or production. Introducing the analogy of the functioning of buildings (with respect to energy and sanitation flows) with that of a parasite. The system layout and the dimensioning backgrounds are explained in this paper. Additional emphasis is put on maintenance, conservation and administration of the integrated whole, and the possible consequences for the district and its inhabitants. There are scale limitations concerning the proposed (and realized) systems. Besides that there is a matter of a unique situation with an "intentional community". Although two similar systems, however small, have been realized, no other project (in process of realization) can be found worldwide in which there is a linking of urban agriculture, waste(water) treatment and energy production at the scale of an urban district. © (2014) Trans Tech Publications, Switzerland.

Ru X.,Harbin Engineering University | Ru X.,Nuclear Power Institute of China | Staehle R.W.,Staehle Consulting
Corrosion | Year: 2013

This review assesses past experiences from superheated fossil plants, supercritical fossil plants, superheated nuclear plants, and light water reactors from the late 1940s until the present. Data from the development and operation of these plants are directly applicable to supercritical water reactor (SCWR) plants being developed currently. This past work can be applied to the development of current designs in the choice of materials, temperature dependencies, effects of stress, and effects of environments on materials. Some of the past data from light water reactor (LWR) technology can be extrapolated into the present SCWR regimes. The past data are in good agreement among the various previous investigators. These past data are considered with respect to specific components in SCWR: fuel cladding, reactor structurals, reactor vessels, and feedwater heaters. Choosing materials for the SCWR applications must recognize that the materials at nominal outlet temperatures are in a dynamic thermal range, i.e., in the nuclear superheat and fossil superheat range, the atomic structures of materials change significantly and change properties such as ductility. It is also possible that compositions and structures of grain boundaries can change, for example, the susceptibility to SCC. The surface temperatures on fuel cladding will be significantly higher than the outlet temperature, and both temperatures will exceed, substantially, the outlet temperatures of present water-cooled plants. Past isothermal data directed toward core structures may not be relevant to the same alloy as fuel cladding. The outlet temperature is useful for considering core structural materials but not for fuel elements, owing to an inevitably high film drop. SCW environments are expected to produce extensive SCC, which differs from past experience. Finally, past data were reanalyzed and additional useful insights were obtained. © 2013, NACE International.

Wenbo Z.,Harbin Engineering University
Key Engineering Materials | Year: 2014

The materials and surface treatment of warship cabin walls affect not only the safety but also the habitability. The performances of the specific fire retardant are investigated according to the requirements of Chinese Standard GB8624. The experiment is conducted in Cone Calorimeter. The results show that it is a noninflammable material, which has an excellent flame retardant effect arriving at B1 level of the standard. It provide a diverse selection of cabin materials. ©(2014) Trans Tech Publications, Switzerland.

Jiang L.,Harbin Engineering University
Key Engineering Materials | Year: 2014

The matching method is used to select the most similar modular design scheme from the history product database. The existed methods are not efficient enough. A new matching method based on the gray theory was presented. The absolute correlation degree and the relative correlation degree between the target modular product and the history product were calculated respectively, and finally the comprehensive correlative degree was gotten, the most similar historical product was matched. In the end, the approach is illustrated with a hydraulic turbine case. © 2014 Trans Tech Publications, Switzerland.

Hou Z.,CAS Changchun Institute of Applied Chemistry | Li C.,CAS Changchun Institute of Applied Chemistry | Ma P.,CAS Changchun Institute of Applied Chemistry | Li G.,CAS Changchun Institute of Applied Chemistry | And 5 more authors.
Advanced Functional Materials | Year: 2011

Up-conversion (UC) luminescent porous silica fibers decorated with NaYF4:Yb3+, Er3+ nanocrystals (NCs) (denoted as NaYF4:Yb3+, Er3+@silica fiber) are prepared by the electrospinning process using cationic surfactant P123 as a template. Monodisperse and hydrophobic oleic acid capped β-NaYF4: Yb 3+, Er3+ NCs are prepared by thermal decomposition methodology. Then, these NCs are transferred into aqueous solution by employing cetyltrimethylammonium bromide (CTAB) as secondary surfactant. The water-dispersible β-NaYF4:Yb3+, Er3+ NCs are dispersed into precursor electrospinning solution containing P123 and tetraethyl orthosilicate (TEOS), followed by preparation of precursor fibers via electrospinning. Finally, porous α-NaYF4:Yb3+, Er3+@silica fiber nanocomposites are obtained after annealing the precursor fibers containing β-NaYF4:Yb3+, Er 3+ at 550 °C. The as-prepared α-NaYF4:Yb 3+, Er3+@silica fiber possesses porous structure and UC luminescence properties simultaneously. Furthermore, the obtained nanocomposites can be used as a drug delivery host carrier and drug storage/release properties are investigated, using ibuprofen (IBU) as a model drug. The results indicate that the IBU-loaded α-NaYF4:Yb3+, Er 3+@silica fiber nanocomposites show UC emission of Er3+ under 980 nm NIR laser excitation and a controlled release property for IBU. Meanwhile, the UC emission intensity of IBU-α-NaYF4:Yb 3+, Er3+@silica fiber system varies with the released amount of IBU. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Liang H.,University Of Science And Technology Liaoning | Li X.,Harbin Engineering University
International Journal of Advanced Manufacturing Technology | Year: 2013

Five-axis machining is more widely used in manufacturing of freeform surfaces. However, in five-axis machining of freeform surfaces, incomplete information exchange between computer numerical control (CNC) and computer-aided design/computer-aided manufacturing (CAM) results in many limitations need to be rectified. In the paper, a new structure of CNC based on STEP-NC standard is proposed, where tool path planning, tool offset, and inverse kinematics are transferred from CAM to CNC. In order to guarantee good openness, open platform and standard interface are applied in the development. Technology of module collaboration and design of data flow are studied. A five-axis real-time interpolator for non-uniform rational B-spline surfaces machining is realized. Based on these technologies, a five-axis CNC is developed in the manner of software realization, which consists of interpreter, task coordinator, axis group, softPLC, etc. The software CNC system has been applied on a tilt-rotary type five-axis machine tool, where the milling experiment has been performed successfully. © 2013 Springer-Verlag London.

Lin W.J.,Harbin Engineering University
Journal of biomedical materials research. Part B, Applied biomaterials | Year: 2012

As-cast Ti-xGe (x = 2, 5, 10, 20 wt %) binary alloys were produced in this work, and various experiments were carried out to investigate the microstructure, mechanical properties, in vitro electrochemical and immersion corrosion behaviors as well as cytotoxicity with as-cast pure Ti as control, aiming to study the feasibility of Ti-xGe alloy system as potential dental materials. The microstructure of Ti-xGe alloys changes from single α-Ti phase to α-Ti + Ti(5)Ge(3) precipitation phase with the increase of Ge content. Mechanical tests show that Ti-5Ge alloy has the best comprehensive mechanical properties. The corrosion behavior of Ti-xGe alloys in artificial saliva with different NaF and lactic acid addition at 37°C indicates that Ti-2Ge and Ti-5Ge alloys show better corrosion resistance to fluorine-containing solution. The cytotoxicity test indicates that Ti-xGe alloy extracts show no obvious reduction of cell viability to L-929 fibroblasts and MG-63 osteosarcoma cells, similar to pure Ti which is generally acknowledged to be biocompatible. Considering all these results, Ti-2Ge and Ti-5Ge alloys possess the optimal comprehensive performance and might be used as potential dental materials. Copyright © 2012 Wiley Periodicals, Inc.

Attaelmanan M.,Northeast Forestry University | Feng C.P.,Harbin Engineering University | Ai A.-H.,University of Mosul
Construction and Building Materials | Year: 2011

This paper investigates the viability of using high density polyethylene (HDPE) as a modifier for asphalt paving materials. Different ratios of HDPE by weight of asphalt were blended with 80/100 paving grade asphalt. Unmodified and modified asphalt binders were subjected to physicochemical and homogeneity tests. The performance tests including, Marshall Stability, Marshall Quotient (MQ), tensile strength, tensile strength ratio, flexural strength and resilient modulus were carried out on unmodified and modified hot asphalt mixtures. The analyses of test results show that the performance of HDPE-modified asphalt mixtures are better than conventional mixtures. The moisture susceptibility and temperature susceptibility can be reduced by the inclusion of HDPE in the asphalt mixture. A HDPE content of 5% by weight of asphalt is recommended for the improvement of the performance of asphalt concrete mixtures similar to that investigated in this study. © 2010 Elsevier Ltd. All rights reserved.

Gao P.,Harbin Engineering University
ACS Applied Materials and Interfaces | Year: 2013

In the paper, we developed an in situ diffusion growth method to fabricate porous Fe2(MoO4)3 nanorods. The average diameter and the length of the porous nanorods were 200 nm and 1.2-4 μm, respectively. Moreover, many micropores existed along axial direction of the Fe2(MoO4)3 nanorods. In terms of nitrogen adsorption-desorption isotherms, calculated pore size was in the range of 4-115 nm, agreeing well with the transmission electron microscope observations. Because of the uniquely porous characteristics and catalytic ability at low temperatures, the porous Fe2(MoO4)3 nanorods exhibited very good H2S sensing properties, including high sensitivity at a low working temperature (80 C), relatively fast response and recovery times, good selectivity, and long-term stability. Thus, the porous Fe2(MoO4)3 nanorods are very promising for the fabrication of high-performance H2S gas sensors. Furthermore, the strategy presented here could be expended as a general method to synthesize other hollow/porous-type transition metal molybdate nanostructures by rational designation in nanoscale. © 2013 American Chemical Society.

Li D.-L.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2010

In order to predict ship maneuverability in viscous flows, hydrodynamic derivatives related to maneuverability were analyzed using the commercial software FLUENT. Its dynamic mesh method and post-processing system were also fully used. Ship motion can be defined in terms of different heading angles, rudder angles, pure sway, and pure yaw. In this way hydrodynamic forces and moment can be expressed in a local coordinate system. Hydrodynamic derivatives of ship movement equations were calculated by least squares curve fitting. The results showed that the hydrodynamic forces of swaying and yawing and their dimensionless frequencies were well in accordance with a linear relationship, thus this method was found superior for calculating hydro-dynamic derivatives of complicated ship motion.

Wu X.-G.,Harbin Engineering University | Wu X.-G.,Kumoh National Institute of Technology | Han S.-M.,Kumoh National Institute of Technology
Journal of Bridge Engineering | Year: 2010

The purpose is to analyze the interface shear connection behavior for ultrahigh-performance fiber-reinforced concrete (UHPFRC) and normal concrete (NC) composite girders. The shape and dimension of the shear stud in the conducted tests are referenced from the traditional interface connection design and engineering experiences. The interface shear connection parameters, i.e., initial stiffness and slippage capacity of a single shear stud, are measured from three groups of lateral direct push test specimens with different numbers of studs. Based on the UHPFRC tensile failure characteristics and cracked section rotational mechanisms of the UHPFRC-NC composite structures with flexural, or flexural and shear failure, the limit state is defined as a full pullout from the bottom fiber of the UHPFRC girders. Pseudostrain hardening behavior of the UHPFRC is simplified as an equivalent rectangular stress block. From this mechanism, the interface equilibrium equations are constituted and the interface shear connection degree of the UHPFRC-NC composite girders is derived. It is recommended that the interface shear connection degree may be used as minimum design standard for UHPFRC-NC composite interface shear connection design. © 2010 ASCE.

Tang C.,Harbin Engineering University
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi | Year: 2013

In cell image sequences, due to the nonlinear and nonGaussian motion characteristics of active cells, the accurate prediction and tracking is still an unsolved problem. We applied extended Kalman particle filter (EKF-PF) here in our study, attempting to solve the problem. Firstly we confirmed the existence and positions of the active cells. Then we established a motion model and improved it via adding motion angle estimation. Next we predicted motion parameters, such as displacement, velocity, accelerated velocity and motion angle, in region centers of the cells being tracked. Finally we obtained the motion traces of active cells. There were fourteen active cells in three image sequences which have been tracked. The errors were less than 2.5 pixels when the prediction values were compared with actual values. It showed that the presented algorithm may basically reach the solution of accurate predition and tracking of the active cells.

Li X.,Nanjing University | Fang J.,Sun Yat Sen University | Liu G.,Harbin Engineering University | Zhang S.,Nanjing University | And 2 more authors.
Water Research | Year: 2014

Hydrated electron (eaq -), which is listed among the most reactive reducing species, has great potential for removal and detoxification of recalcitrant contaminants. Here we provided quantitative insight into the availability and conversion of eaq - in a newly developed sulfite/UV process. Using monochloroacetic acid as a simple eaq --probe, the eaq --induced dehalogenation kinetics in synthetic and surface water was well predicted by the developed models. The models interpreted the complex roles of pH and S(IV), and also revealed the positive effects of UV intensity and temperature quantitatively. Impacts of humic acid, ferrous ion, carbonate/bicarbonate, and surface water matrix were also examined. Despite the retardation of dehalogenation by electron scavengers, the process was effective even in surface water. Efficiency of the process was discussed, and the optimization approaches were proposed. This study is believed to better understand the eaq --induced dehalogenation by the sulfite/UV process in a quantitative manner, which is very important for its potential application in water treatment. © 2014 Elsevier Ltd.

Wang L.,Harbin Institute of Technology | Sun X.,Harbin Institute of Technology | Xing J.,Harbin Engineering University
Optics Communications | Year: 2012

Retrieval of spheroidal particle size distribution using an approximate method in spectral extinction technique is proposed. The combined approximate method, which is the combination of Mie method and generalized eikonal approximation (GEA) method, is used as an alternative to the rigorous solutions to calculate the averaging extinction efficiency of spheroid. Based on the averaging extinction efficiency, the accuracy and limitations of the retrieval are then investigated. Moreover, the validity range and effect of the refractive index are also examined. The Johnson's S B function in this paper is used as a versatile function to fit the commonly used particle size distribution functions in the dependent model. Simulations and experimental results show that the combined approximate method can be successfully applied to retrieval of spheroidal particle size distribution. In certain constraint conditions, the retrieval results demonstrate the high reliability and stability of the method. By using the combined approximate method, the complexity and computation time of the retrieval are significantly reduced, which is more suitable for quick and easy measurement. The method can also be used as a replacement when the rigorous solutions suffer computationally intractable difficulties. © 2011 Elsevier B.V. All rights reserved.

Yang S.-E.,Harbin Engineering University
Journal of Marine Science and Application | Year: 2010

The method of coupled mode is introduced for investigation of bi-static distant bottom reverberation of impulsive source in shallow water, which will not contradict with principle of reciprocity in all cases. And the method of multi-pole for directional source is also introduced. It shows that in case of layered medium, intensity of bi-static bottom reverberation will decease according to the cubic power of receiving time t, and the transverse spatial correlation of bottom reverberation is a little greater than longitudinal correlation for equal separation of receivers, and both vary in form with the receiving time. © 2010 Harbin Engineering University and Springer Berlin Heidelberg.

Liu Y.,Harbin Engineering University | Tang C.,Tianjin Polytechnic University
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

The holographic camera system for research and analysis on marine microorganisms and particles has a wide application prospect. Because of the special imaging technique (the holographic imaging technology) and the special imaging environment (seabed), there are a variety of different oblique stripe noises in the holograms. The existence of oblique stripe noises seriously affect quality of reconstructed image of the marine biological hologram and further processing, and the present methods for common stripe noise are no longer suitable. An effective method is proposed to deal with the oblique stripe noises. For the periodic oblique stripe noise, the local threshold method is adopted to find out the frequency center of the noise, and the Gaussian notch filter is utilized to eliminate the noise. For the aperiodic oblique stripe noise, the linear equation is used to simulate the bright line of the noise in the frequency domain, and the partial notch filter is exploited to depress the noise. Simulation results illustrate that the proposed method can filter out the periodic oblique stripe noise completely as well as the aperiodic oblique stripe noise mostly, and the useful information of the holograms can be kept.

Zhou L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jia H.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | An W.-G.,Harbin Engineering University
Gongcheng Lixue/Engineering Mechanics | Year: 2012

When the structural failure function is highly nonlinear, the initial step length is difficult to determine for the application of the limit step length iteration method. To solve this problem, the modified limit step length iteration algorithm is presented in this paper. Illustrative examples demonstrate the reason of zigzagging movements and non-convergence in the application of the limit step length iteration method. To ensure that each iteration step length is optimized, the golden section method is introduced for one dimensional search of the step length. A new merit function is given according to the extreme value condition of extensive Lagrange function, and the calculation procedure of the modified limit step length iteration method is presented in correlation normal space. Numerical examples demonstrate the accuracy of the modified limit step length iteration method. It has better convergence when the structural failure function is highly nonlinear, and the number of iteration step is less than that of modified iterative algorithm.

Wang B.,CAS National Center for Nanoscience and Technology | Li X.,CAS National Center for Nanoscience and Technology | Luo B.,CAS National Center for Nanoscience and Technology | Hao L.,CAS National Center for Nanoscience and Technology | And 4 more authors.
Advanced Materials | Year: 2015

Graphene-sheet-supported uniform ultrasmall (≈3 nm) silicon quantum dots are successfully synthesized using a simple and effective self-assembly strategy. They exhibit unprecedented fast, surface-controlled lithium-storage behavior and outstanding lithium-storage properties including extraordinary rate capability and remarkable cycling stability, attributable to the intrinsic role of approaching the downsizing limit of silicon. (Chemical Equation Presented). © 2015 WILEY-VCH Verlag GmbH & Co. KGaA.

Huang X.,Harbin Engineering University
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010 | Year: 2010

STEP-NC compliant CNC machine tool controller in reconfigurable production line environment is considered. Reconfigurable control requirement and execution mechanism for production line makes it necessary to extend and enhance the current STEP-NC compliant CNC controller. Machining feature is specified as leading design clue and IEC 61499 distribute control mechanism is introduced for constructing design philosophy for CNC machine tool controller. Two necessarily enhancing factors are investigated, STEP-NC data model for product family and program for various variants in a particular configuration of production line, and Device model design for CNC machine tool compliant IEC 61499 mechanism. The proposed design philosophy can facilitate and realize CNC machine tool integrate well with networked and distributed production line manufacturing environment. © 2010 IEEE.

Li H.,Harbin Engineering University
Advanced Materials Research | Year: 2011

In mechanical engineering, earthquake engineering and modern municipal construction, semi-cylindrical gap and shallow-buried inclusion structure are used widely. In this paper, Green's Function is studied, which is the solution of displacement field for elastic semi-space with semi-cylindrical gap and multiple shallow-buried inclusions while bearing anti-plane harmonic line source force at any point. In the complex plane, considering the symmetry of SH-wave scattering, the displacement field aroused by the anti-plane harmonic line source force and the scattering displacement field impacted by semi-cylindrical gap and multiple cylindrical inclusions comprised of Fourier-Bessel series with undetermined coefficients which satisfies the stress-free condition on the ground surface are constructed. Through applying the method of multi-polar coordinate system, the equations with unknown coefficients can be obtained by using the displacement and stress condition of the cylindrical inclusion in the radial direction. According to orthogonality condition for trigonometric function, these equations can be reduced to a series of algebraic equations. Then the value of the unknown coefficients can be obtained by solving these algebraic equations. Green's function, that is, the total wave displacement field is the superposition of the displacement field aroused by the anti-plane harmonic line source force and the scattering displacement field. By using the expressions, an example is provided to show the effect of the change of relative location of semi-cylindrical gap, the cylindrical inclusions and the location of the line source force. Based on this solution, the problem of interaction of semi-cylindrical gap, multiple cylindrical inclusions and a linear crack in semi-space can be investigated further. © (2011) Trans Tech Publications, Switzerland.

Zhang S.,Harbin Engineering University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2016

Based on in-depth analyzing the calculation of web pages relevance to the topic and prediction algorithm. A focus crawler which is based on thesaurus classification is proposed, the algorithm pre-judgment the relevance to the topic through the analysis of page title, the pages which have high priority to the topic are first crawled, and the precision rate is improved. Experiment results show that the precision rate by the crawler which is based on thesaurus classification is improved, and the web pages which are relative to topic is good determined. © 2016 SERSC.

Cheng H.Z.,Harbin Engineering University
Applied Mechanics and Materials | Year: 2014

The paper mainly concerns about how relative density and pre-compression quantity of metal rubber shock absorber (MRSA) affect acceleration transmissibility, natural frequency and other parameters of MRSA. In order to study the influence law, sine wave sweep experiment was conducted on different MRSA, and the final data was processed. The influence law could provide reference for practical application of MRSA. © (2014) Trans Tech Publications, Switzerland.

Mo H.,Harbin Engineering University
2012 IEEE 5th International Conference on Advanced Computational Intelligence, ICACI 2012 | Year: 2012

Magnetotactic bacteria is a kind of polyphyletic group of prokaryotes with the characteristics of magnetotaxis that make them orient and swim along geomagnetic field lines. The function of magneto-aerotaxis is to enhance the ability of magnetotactic bacteria to sense oxygen concentration and enable them to more-efficiently locate chemically favorable positions in vertically stratified environments compared to nonmagnetotactic bacteria. A magnetotactic bacteria optimization algorithm(MBOA) inspired by the characteristics of magnetotactic bacteria is proposed in the paper. Experiment results show that the MBOA is effective in optimization problems. It shows good and competitive performance compared with the other classical optimization algorithms. © 2012 IEEE.

Cui H.H.,Harbin Engineering University
Advanced Materials Research | Year: 2014

The purpose of this paper is to investigate the common perspective of value for lean construction (LC) researchers and practitioners. Thus, this paper aims to generate a future discussion in the construction sector about the huge impact of construction projects over the entire society and, consequently, to underline the need of an expansion of current value perspectives moving from a local context (project level) to a global context (society). LC value perspectives lack in a common idea to be applied in the construction industry as a whole. Customer-focused construction practices, where satisfaction of customer requirements predominates over societal welfare. Practical implications - Construction industry should reformulate current practices and governments, as representative of the society, should promote construction regulation policies based on delivery of value including environmental and social issues. © (2014) Trans Tech Publications, Switzerland.

Zhang H.W.,Harbin Engineering University
Advanced Materials Research | Year: 2014

Contact net of motor vehicle in coal mine tunnel is a powerful industrial disturbance source, pulse interference generated by contact net is some pulse group with random, repetitive amplitude and duration. When the train is in the rated working current situation, the pantograph and overhead line is in the process of separation to contact, the motor vehicle running speed is lower, the discharge current is larger, the more arc radiation interference. © (2014) Trans Tech Publications, Switzerland.

Lu F.,Harbin Institute of Technology | Lu F.,Harbin Engineering University | Yu J.,Harbin Institute of Technology
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

For phasor measurement unit (PMU) can't be installed in all buses of a power system, how to analyze power system transient stability with little measurements is an urgent problem to be solved. This paper proposes a method of applying the equal area criterion (EAC) to multi-machine system transient stability assessment directly: the machines with the most leading angle and the most lagging angle are selected, and by fitting their relative power angle curve, EAC is used to identify the transient stability type and to fast calculate the stability index. The advantages of this method is that it avoids machine group division, equivalence, and needs less information and little computation cost. Moreover, it can obtain the same accuracy as time domain simulation method. The validity of the proposed method is proven by an example system. ©2010 State Grid Electric Power Research Institute Press.

Zhang C.,Harbin Institute of Technology | Li J.,Harbin Engineering University | Hu Z.,Harbin Institute of Technology | Zhu F.,Harbin Institute of Technology | Huang Y.,Harbin Institute of Technology
Materials and Design | Year: 2012

Interconnected pore cell in appropriately chosen porous media can help to enhance their sound absorption performance. Acoustic absorbing foam materials were produced from polyurethane (PU) with addition of water as a blowing agent and OR-501 as open pore cell agent. The pore sizes of the foams were varied from 0.35 to 1.05. mm in diameter and the pore cells were interconnected with open porosity in the range from 16.0% to 88.6%. The compressive strength of the foams decreased with increase of interconnected cell ratios. There was a decrease of the strength lower than 92.6% compared to the closed cell sample when interconnected cell ratio was 88.6%. The acoustical efficiencies of PU foams were studied, and the results showed that the porous cell size and interconnected porosity of PU foams had significant influence on the acoustical efficiencies. Significant enhancements of the absorption properties could be obtained over a low frequency band by increasing the interconnected porous cell. The absorption coefficient of the interconnected cell foam was 0.66 at low frequency of 250-600. Hz with an increase of 100% compared to the closed-cell ones. The internal transmission path and loss mechanism of noise in the porous polyurethane materials were also analyzed in the present work. © 2012 Elsevier Ltd.

Wang H.,Harbin Engineering University
ICCET 2010 - 2010 International Conference on Computer Engineering and Technology, Proceedings | Year: 2010

In this paper, the authors summarize the path loss of the wireless body area networks according to the complicated environment and the different frequency. The characterizations of the wireless body area networks are influenced by the some factors. The path loss model is made exactly to be fitted for the it. It produces encouraging results when we apply the method to the function optimization with the introduction of simulation in the dynamic parameter set-up. © 2010 IEEE.

Peng Q.,Yanshan University | Ma N.,Yanshan University | Li X.,Yanshan University | Zhang J.,Harbin Engineering University
Materials Letters | Year: 2012

A Mg-5wt.%Sc alloy was prepared by gravity casting technology. The microstructure, aging behaviour and mechanical properties were investigated. The alloy exhibited a significant age hardening response when it was aged at 190°C for 8 h under an applied stress of 30 MPa. Moreover, compared with the standard T6 condition (solid solution and artificial aging), an improved strength and higher elongation occurred simultaneously for the stress aged sample. The enhanced strength and elongation were chiefly related to the nanosize spherical-shaped MgSc precipitates which effectively decreased the stress concentration at the tip during the deformation. The action of the external stress field eliminated the anisotropy normally associated with the growth of the precipitates during the standard aging process, leading to the formation of spherical-shaped precipitate. It was revealed that the stress aging was an effective approach to the improvement of the mechanical properties of Mg-5 wt.% Sc alloy and potentially many other Mg alloys. © 2012 Elsevier B.V. All rights reserved.

Bao Y.,Harbin Institute of Technology | Li H.,Harbin Institute of Technology | Sun X.,Harbin Engineering University | Yu Y.,Dalian University of Technology | And 2 more authors.
Structural Health Monitoring | Year: 2013

In a wireless sensor network, data loss often occurs during the data transmission between the wireless sensor nodes and the base station. In the wireless sensor network applications for civil structural health monitoring, the errors caused by data loss inevitably affect the data analysis of the structure and subsequent decision making. This article explores a novel application of compressive sampling to recover the lost data in a wireless sensor network used in structural health monitoring. The main idea in this approach is to first perform a linear projection of the transmitted data x onto y by a random matrix and subsequently to transmit the data y to the base station. The original data x are then reconstructed on the base station from the data y using the compressive sampling method. The acceleration time series collected by the field test on the Jinzhou West Bridge and the Structural Health Monitoring System on the National Aquatics Center in Beijing are employed to validate the accuracy of the proposed data loss recovery approach. The results indicate that good recovery accuracy can be obtained if the original data have a sparse characteristic in some orthonormal basis, whereas the recovery accuracy is degraded when the original data are not sparse in the orthonormal basis. © The Author(s) 2012.

Wang C.,China Ship Development And Design Center | Li X.,China Ship Development And Design Center | Wang H.,China Ship Development And Design Center | Gao P.,Harbin Engineering University
Progress in Nuclear Energy | Year: 2014

Friction and heat transfer characteristics of pulsating flow induced by rolling motion are experimentally studied. A series of single-phase forced circulation flow experiments are conducted in a vertical narrow channel. In the present study the flow rate is adjusted through control the impeller rotator speed of the pump. The results show that the flow rate pulsation simultaneously with the rolling motion and the relative amplitude of the flow rate pulsation decreases with the increasing flow rate. Accordingly, the relationships between the relative pulsation amplitude of friction factor, heat transfer coefficient and flow rate are classified. Therefore, the correlations have been developed to calculate the friction and heat transfer coefficient based on the relative pulsation amplitude of the flow rate. © 2013 Elsevier Ltd. All rights reserved.

Cheng B.-Z.,Daqing Normal University | Zhao C.-H.,Harbin Engineering University
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2013

The high dimensionality of hyperspectral image increases information, but it also leads to the question of dimensionality curse. There are several problems to be solved in reducing dimension, eliminating redundancy of bands, and suppressing background interferences during hyperspectral anomaly targets detection. Aiming at the problems, this paper proposes a new anomaly target detection algorithm of hyperspectral image based on particle swarm optimization (PSO) clustering. Firstly, the algorithm optimizes the traditional-means clustering by using PSO method, the original hyperspectral image is divided for bands subset class by PSO clustering while the features of hyperspectral image bands aren't changed, and those bands with similar features are clustering; Then, the feature information of all band subsets is extracted by using the principal component analysis, which makes the information of anomaly target with highlight and suppresses background interference; At last, the optimal band subsets are achieved by fourth-order cumulant of principal component in band subsets, and anomaly detection is carried on by the kernel RX. The results show that the proposed algorithm was higher precision and lower false alarm probability.

Heng Z.,Harbin Engineering University
Kybernetes | Year: 2010

Purpose: The purpose of this paper is to develop a system to analyse the characteristics of infrared objects. Design/methodology/approach: According to the gray scale of image pixel by the image entropy, gray scale estimating is carries on to construct the neural networks. And then the grey relational analysis and grey clustering methods are applied to filter the possible object. The target is predicted through image segmentation pretreatment based on the forecasting value by grey system and assigned corresponding mark. The forecasting precision is greatly elevated by GM (1, 1) model. Findings: The paper illustrates that, based on the analysis and its experimental results, this system has a good recognition rate for infrared target. Research limitations/implications: This paper provides a way to grasp the minutial feature of the image. The filtering operation based on pixel level provided auto-adapted filtering with a new stage. Practical implications: Applications of grey theory deepened the content of detecting infrared targets and enriched technology of image processing. Originality/value: This system introduces an effective method for detecting infrared targets. © Emerald Group Publishing Limited.

Chong W.,Harbin Engineering University
International Journal of Heat and Technology | Year: 2015

Large-scale LNG-FSRU is a new kind of storage and transportation facility for liquefied natural gas (LNG). It adopts the double hull double row tank structure, and the temperature distribution is quite complex. This paper utilizes a simplified analytical method and a finite element numerical method to analyze the steady thermal field of this large cargo area while transporting the ultra low temperature LNG. Eventually, the steady temperature field distribution of the cargo area is obtained. This study indicates that the analysis results of the simplified analytical method is consistent with that of the finite element numerical method in terms of the thermal field of double hull double row tank structural cargo area.

He-Ming J.,Northeast Forestry University | Wen-Long S.,Northeast Forestry University | Zi-Yin C.,Harbin Engineering University
Advances in Information Sciences and Service Sciences | Year: 2012

In this paper, a nonlinear backstepping controller based on line of sight guidance method is presented to drive an underactuated AUV to follow desired bottom profile. Tracking error equations in vertical plane are established according to the virtual guidance method. Based on Lyapunov stability theorem, the whole system can be guaranteed asymptotic stability with bottom-following error convergence to zero, and the states are all bounded. Finally, simulation results illustrate that the parameters of controller are easy to be adjusted, and the vehicle can track the desired bottom profile accurately.

Gong X.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2010

The operational efficiency of the equipment manufacturing industry influences the incremental model of economic subsystems of Heilongjiang, the whole growth potential and the ability of sustainable development in the area. The author measured the ecological, environmental, and energy resources costs that result from the development of equipment manufacturing industry. From the viewpoint of evaluating input-output efficiency, the author constructed an evaluation system based on a composite data envelopment analysis (DEA) model. In addition, after analyzing the methods used in the compound DEA model, sensitivity coefficients were changed for every input and output index that was calculated. Critical factors restricting the efficiency of development of the equipment manufacturing industry could then be determined. In this way a quantitative reference has been provided for administrative decisions.

Zhang F.,Harbin Engineering University | Yu D.,Harbin Institute of Technology | Ding Y.,Harbin Institute of Technology | Li H.,Harbin Institute of Technology
Applied Physics Letters | Year: 2011

A two-dimensional particle in cell model is used to simulate the sheath oscillation in stationary plasma thrusters. The embedded secondary electron emission (SEE) submodel is based on that of Morozov but improved by considering the electron elastic reflection effect. The simulation results show that when the SEE coefficient is smaller than one due to the relative low electron temperature, one-dimensional static sheath can be found; as the electron temperature increase, the SEE coefficient approaches to one and temporal oscillation sheath appears; when the electron temperature increases so high that the SEE coefficient is beyond one, the sheath oscillates not only in time but also in space. © 2011 American Institute of Physics.

Shi L.,Kagawa University | Guo S.,Kagawa University | Guo S.,Harbin Engineering University | Asaka K.,Japan National Institute of Advanced Industrial Science and Technology
International Journal of Robotics and Automation | Year: 2011

Biomimetic microrobots, with multiple degrees of freedom, that can walk and swim smoothly in water are important topics in the field of underwater monitoring for applications such as pollution detection and video mapping. We propose a new type of underwater microrobot using eight ionic polymer metal composite (IPMC) actuators as legs to resolve the problems of asymmetry in previous crawling microrobots. We developed a prototype of this underwater microrobot and conducted experiments to evaluate its walking, rotating, and floating speeds. This microrobot had better performance in walking and rotating than the previous model. Although it achieved its flotation by electrolysing water around the IPMC surface, the electrolysis process was not easy to control. To improve the floating motion, we propose a new jellyfish-type microrobot that moves like a jellyfish when floating and sinking and has four IPMC actuators aslegs in place of the jellyfish's antennae. We conducted experimentsto analyse the floating motion for three types of bodies and calculated the theoretical floating speeds. We developed a prototype of this jellyfish-type microrobot and evaluated the floating and walking speeds experimentally.

Wang R.,Dalian University of Technology | Sun Y.-T.,Dalian University of Technology | Shi P.,Harbin Engineering University | Shi P.,Victoria University of Melbourne | Wu S.-N.,Dalian University of Technology
Information Sciences | Year: 2014

This paper addresses the problem of exponential stability for a class of descriptor systems with interval time-varying delays. The time-varying delays contain a large delay period (LDP), which is often present in practical control systems. Such descriptor system with LDP has been modeled as a switched descriptor system with delay, which may include an unstable subsystem caused by large delay bound. By adopting the switching technique and constructing a novel Lyapunov-Krasovskii functional, stability criteria are proposed under the restriction frequency and the rate of LDP to ensure that the descriptor system is regular, impulse free and exponentially stable. Finally, an integrated circuit example and a numerical simulation are given to illustrate the effectiveness and applicability of the proposed method. © 2014 Elsevier Inc. All rights reserved.

Lu K.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2011

Human cognition is a kind of information activity, so it must have relevant mathematical theories of its own. Based on the entropy theory of Shannon's information theory, the fundamental mathematical principle of cognition was discussed. It was pointed out that cognition is a series of decreases in entropy through which the object information and information of regularities are obtained from enormous input perception signals. As for the state of information, it can be partly determined by prediction and partly detected in real observation of the variations in appearance information.

Ding M.,Harbin Engineering University | Ding M.,Technical University of Delft | Kloosterman J.L.,Technical University of Delft
Nuclear Engineering and Design | Year: 2013

Small long-life high temperature gas-cooled reactors (HTRs) may provide electricity or heat for remote areas or industrial users in developed and/or developing countries. Moreover, small HTRs have advantages over large nuclear reactors of demonstrated inherent safety, transportability, modular construction, and flexible site selection. This paper presents the thermal-hydraulic evaluations of the U-Battery, which is a small, long-life and block-type HTR using the DALTON/THERMIX code system. The thermal-hydraulic characteristics of a cylindrical design and an annular design of the U-Battery were evaluated for loss of forced-cooling (LOFC) incidents including depressurized LOFC (DLOFC) and pressurized LOFC (PLOFC) incidents. The calculations show that the stronger natural circulation during the PLOFC makes the reactor core cool faster than during the DLOFC, flattens the radial solid temperature distribution, and transfers more heat from the hot regions (bottom and center of the reactor core) to cold regions (top and periphery of the reactor core). Although the natural circulation in the reactor core is so weak that it is neglected during the DLOFC, the decay heat is removed passively by conduction without any violation of the temperature limits for the 20 MWth U-Battery. The comparisons of the cylindrical and annular reactor core configurations show that the latter is a better design with a lower maximum core temperature during the LOFC because of the central graphite reflector. Moreover, it is possible to adopt the current reactor configuration when the thermal power of the U-Battery increases from 20 MWth to 40 MWth.© 2012 Elsevier B.V. All rights reserved .

Liu X.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2011

By using the Rodrigues parameter and internal model method, an adaptive state feedback control law was proposed for a rigid spacecraft with inertia uncertainty and disturbance. Since the governing equations were in cascade form, the parameter uncertainty was handled by an adaptive control. The control law was designed by using backstepping and Lyapunov analysis, and the global stability of the closed-loop system was proven. Finally, numerical simulations were included to demonstrate the performance of the presented controller.

Xu X.-F.,China University of Petroleum - East China | Zhao J.-L.,Harbin Engineering University | Song J.-K.,China University of Petroleum - East China
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2012

Collaborative logistics network about complex manufacturing is a dynamic open system. Its resource planning decision is easily influenced by stochastic uncertainty factors in network, so it presents the rigid sensitive and stable expiration phenomenon and belongs to the question that parameter status and probability distribution are unknown. In view of this completely uncertain question, the paper proposes a expected model of robust restraint, and carries uncertainty simulation on related parameter of network resource planning decision with Monte Carlo method. In comparison with optimization model which isn't constrained, the example results show that this model and method can actively control and weaken the negative influence of uncertain factors and increase the resource planning's stability and continuity. Finally, it provides a new angle of view for solving completely uncertain questions.

Wu L.,Harbin Institute of Technology | Wu L.,Harbin Engineering University | Feng Z.,University of Hong Kong | Lam J.,University of Hong Kong
IEEE Transactions on Neural Networks and Learning Systems | Year: 2013

This paper is concerned with the problems of exponential stability analysis and synchronization of discrete-time switched delayed neural networks. Using the average dwell time approach together with the piecewise Lyapunov function technique, sufficient conditions are proposed to guarantee the exponential stability for the switched neural networks with time-delays. Benefitting from the delay partitioning method and the free-weighting matrix technique, the conservatism of the obtained results is reduced. In addition, the decay estimates are explicitly given and the synchronization problem is solved. The results reported in this paper not only depend upon the delay, but also depend upon the partitioning, which aims at reducing the conservatism. Numerical examples are presented to demonstrate the usefulness of the derived theoretical results. © 2012 IEEE.

Tang C.,Tianjin Polytechnic University | Hussain A.,Harbin Engineering University
IEEE Transactions on Vehicular Technology | Year: 2015

Vehicle surveillance in complex dark traffic scenes has been a key research topic, as the background is dramatically altered due to the reflections from headlights on normal, snowy, and rainy roads. Under dark conditions, a vehicle's headlights and rear lights are used for foreground extraction. The presented algorithm provides several steps, including the detection, pairing, and tracking of headlights and rear lights. First, the headlights are automatically extracted by a novel approach called azimuthally blur, which uses the exponentially attenuating nature of reflected light. This approach is robust on highly reflective scenes because it makes the headlights orthogonal to the reflections. The headlights are then paired by partitioning the image into subgroups such that in each group, the headlights remain equidistant. The optimized tracker based on the maximum a posteriori (MAP) probability estimator is employed for further analysis such as speed estimation. This whole scheme is computationally inexpensive and can be deployed in application-specific integrated circuits. The proposed approach has outperformed state-of-the-art methods in challenging unlit traffic scenes. © 1967-2012 IEEE.

Yang Y.-Y.,Harbin Engineering University
International Journal of Theoretical Physics | Year: 2014

In this Letter, we propose a quantum secure direct communication protocol based on single photons without quantum memories. In the proposed protocol, quantum states are transmitted in a stream but not in a quantum data block, hence, quantum memories are unnecessary. Compare with other protocols the advantages of our protocol are smaller quantum space usage, lower cost and more easily being implemented experimentally. © 2014, Springer Science+Business Media New York.

Ge B.,Harbin Engineering University | Zhou Q.-M.,Northeast Forestry University | Wu Y.-H.,Harbin University of Science and Technology
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2015

In this article, we consider the nonlinear eigenvalue problem:(Formula presented.), where Ω is a bounded domain of RN with smooth boundary, λ is a positive real number, p,q:Ω¯→(1,+∞) are continuous functions, and V is an indefinite weight function. Considering different situations concerning the growth rates involved in the above quoted problem, we prove the existence of a continuous family of eigenvalues. The proofs of the main results are based on the mountain pass lemma and Ekeland’s variational principle. © 2014, Springer Basel.

Sun C.,University of Texas at Austin | Sun C.,CAS Institute of Physics | Rajasekhara S.,University of Texas at Austin | Chen Y.,Harbin Engineering University | Goodenough J.B.,University of Texas at Austin
Chemical Communications | Year: 2011

A solvothermal method was developed to prepare on a large scale monodisperse porous β-Co(OH)2 microspheres consisting of nanoplatelets. Co3O4 microspheres with porous platelets were obtained via subsequent thermal decomposition. These Co3O 4 microspheres show much higher ethanol sensitivity and selectivity at a relatively low temperature (135 °C) compared with those of commercial Co3O4 nanoparticles. © 2011 The Royal Society of Chemistry.

Sun F.,Harbin Engineering University | Tang L.-J.,China Ship Development And Design Center
Kongzhi yu Juece/Control and Decision | Year: 2013

In order to select the appropriate filtering method from the UKF and CKF for the different dimensions nonlinear systems estimation, the two filters are analyzed and compared through the Taylor expansion of function and the numerical stability. Due to the different dimension, the captured high-order item degree of function Taylor expansion and the numerical stability are different to appear different filter precisions, so that the filter choice ways of different dimension are acquired. Simulation results show the correctness of with the theoretical analysis.

Zhang Z.,Harbin Engineering University
Materials China | Year: 2016

High strength low alloy (HSLA) steels were developed based on the plain carbon steels. HSLA steels have been applied widely to automobile industry, ship building and marine engineering, and infrastructure construction, etc., due to the moderate mechanical properties, good formability and low cost. With the requirement in the improved properties of steels, specifically weldability and low-temperature toughness, HSLA steels were strengthened by Cu-precipitation, which have attracted great interest. In this paper, the origin of HSLA steels was introduced firstly, combining with the discussion of the strengthening mechanisms. The emphasis was mainly placed on the dual-phase HSLA steels and Cu-precipitation strengthened HSLA steels. The control of steel matrix microstructure and their effects on the mechanical properties were reviewed. Subsequently, phase transformation of matrix and Cu precipitation processes during both isothermal cooling and continuous cooling were reviewed. Finally, the concept of Cu-rich nanoclusters in HSLA and the corresponding advanced characterization methods were introduced. The effects of alloying elements on the formation of Cu-rich nanoclusters were also reviewed. © 2016, The Editorial Board of Materials China. All right reserved.

Zheng L.Y.-W.Z.,Harbin Engineering University
Proceedings of the 2015 27th Chinese Control and Decision Conference, CCDC 2015 | Year: 2015

To decrease the vertical acceleration associated with pitch and heave, a multivariable PD controller is firstly designed in the paper, then parameters of the controllers are optimized according to the H2 norm of the worst vertical acceleration (WVA) output. The non-linearity of the actuators (flaps and T-foil) is considered and included into the simulation process. In order to assess the closed-loop performance of the nonlinear system, an evaluation method based on the describing function and the variance gain is proposed. This evaluation approach provides, in the frequency domain, a clear picture of the closed-loop performance on the vertical acceleration. By using this evaluation approach to a specific example, it is indicated that this frequency domain closed-loop performance computation approach can more reasonably explain the simulation results of the system. This evaluation method can not only be used to quantitatively access the WVA reduction percentage, but also can be used to estimate the degree of Input/Output non-linearity of the closed-loop system. © 2015 IEEE.

Zhang X.,Harbin Institute of Technology | Zhang X.,Harbin Engineering University | Cheng D.,Chinese Academy of Sciences
Asian Journal of Control | Year: 2012

In this paper, we consider the attitude tracking and disturbance rejection problem of rigid spacecraft, which is subject to some disturbances generated by nonlinear exosystems. A new nonlinear internal model is designed to manipulate the uncertainties caused by external disturbances, which includes the linear internal model as a special case. A numerical example is given to illustrate the theoretical result presented in the paper. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

Wang Q.,Hong Kong Polytechnic University | Shi W.,Hong Kong Polytechnic University | Shi W.,Wuhan University | Wang L.,Harbin Engineering University
IEEE Transactions on Geoscience and Remote Sensing | Year: 2014

There is a type of algorithm for subpixel mapping (SPM), namely, the soft-then-hard SPM (STHSPM) algorithm that first estimates soft attribute values for land cover classes at the subpixel scale level and then allocates classes (i.e., hard attribute values) for subpixels according to the soft attribute values. This paper presents a novel class allocation approach for STHSPM algorithms, which allocates classes in units of class (UOC). First, a visiting order for all classes is predetermined, and the number of subpixels belonging to each class is calculated using coarse fraction data. Then, according to the visiting order, the subpixels belonging to the being visited class are determined by comparing the soft attribute values of this class, and the remaining subpixels are used for the allocation of the next class. The process is terminated when each subpixel is allocated to a class. UOC was tested on three remote sensing images with five STHSPM algorithms: back-propagation neural network, Hopfield neural network, subpixel/pixel spatial attraction model, kriging, and indicator cokriging. UOC was also compared with three existing allocation methods, i.e., linear optimization technique (LOT), sequential assignment in units of subpixel (UOS), and a method that assigns subpixels with highest soft attribute values first (HAVF). Results show that for all STHSPM algorithms, UOC is able to produce higher SPM accuracy than UOS and HAVF; compared with LOT, UOC is able to achieve at least comparable accuracy but needs much less computing time. Hence, UOC provides an effective and real-time class allocation method for STHSPM algorithms. © 1980-2012 IEEE.

Liu G.,Harbin Engineering University
Environmental science and pollution research international | Year: 2011

The Zha Long Wetland, the first water bird conservation area in China, lies on the northern bank of the Song Nen Plain with an area of 2,100 km(2). In many areas of the Zha Long Wetland, water pollution has led to a decrease in the wetland's ecological function, vegetation degradation, a decrease in the number of bird species, and the depletion of fish resources. The sediments used in this study were collected from the surface sediment of seven sites and from different depths in three types of marshes in the Zha Long Wetland in northeast China in late October 2006. The levels and distribution patterns of 17 organochlorine pesticides (OCPs; α-HCH, β-HCH, γ-HCH, δ-HCH, p,p'-DDE, p,p'-DDD, p,p'-DDT, endosulfan I, endosulfan II, endosulfan sulfate, heptachlor, heptachlor epoxide, aldrin, dieldrin, endrin, endrin aldehyde, and methoxychlor) in surface sediments as well as hexachlorocyclohexane (HCH) and 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane (DDT) in vertical sediments were investigated. The concentrations of HCHs, DDTs, endosulfans, heptachlors, aldrin, and methoxychlor in surface sediments ranged from 10.44 to 41.97 ng/g, nd (undetectable levels) to 211.88 ng/g, nd to 69.89 ng/g, nd to 28.10 ng/g, 9.81 to 623.83 ng/g, and from nd to 3.99 ng/g, respectively. The highest levels of OCPs were detected in Tangtugangzi at a total concentration of 727.72 ng/g, where the dominant compound was endrin at a concentration of 483.04 ng/g. In the vertical sediments, the HCHs and DDTs were in the ranges of nd-136.00 and nd-214.06 ng/g, respectively. Different distributions of HCHs, DDTs, and other OCPs indicated that they originated from different contamination sources. Composition analyses in surface sediments indicated recent OCP usage or discharge at some sample sites in the Zha Long Wetland.

Sun W.,LIAONING Technical University | Sun F.,Harbin Engineering University
Journal of Systems Engineering and Electronics | Year: 2011

Strapdown inertial navigation system (SINS) requires an initialization process that establishes the relationship between the body frame and the local geographic reference. This process, called alignment, is generally used to estimate the initial attitude angles. This is possible because an accurate determination of the inertial measurement unit (IMU) motion is available based on the measurement obtained from global position system (GPS). But the update frequency of GPS is much lower than SINS. Due to the non-synchronous data streams from GPS and SINS, the initial attitude angles may not be computed accurately enough. In addition, the estimated initial attitude angles may have relatively large uncertainties that can affect the accuracy of other navigation parameters. This paper presents an effective approach of matching the velocities which are provided by GPS and SINS. In this approach, a digital high-pass filter, which implements a pre-filtering scheme of the measured signal, is used to filter the Schuler cycle of discrete velocity difference between the SINS and GPS. Simulation results show that this approach improves the accuracy greatly and makes the convergence time satisfy the required accuracy.

Wu L.,Harbin Engineering University | Su X.,Harbin Institute of Technology | Shi P.,University of Adelaide | Shi P.,Victoria University of Melbourne
IEEE Transactions on Automatic Control | Year: 2014

This paper is concerned with the induced ℓ2 dynamic output feedback controller (DOFC) design problem for discrete-time Markovian jump repeated scalar nonlinear systems. By employing both the switching-sequence dependent Lyapunov function approach and the positive definite diagonally dominant Lyapunov function technique, a sufficient condition is first established, which guarantees the underlying system to be stochastically stable with an induced ℓ2 disturbance attenuation performance. Then the desired full- or reduced-order DOFCs are designed by using projection approach. Cone complementarity linearization procedure is employed to cast the nonconvex feasibility problem into a sequential minimization problem. Finally, a numerical example is presented to show the effectiveness of the proposed methods. © 2013 IEEE.

Shie Y.,Harbin Engineering University
Mathematical Problems in Engineering | Year: 2014

We present a meshfree approach to model dynamic fracture in thin structures. Material failure is modeled based on a stress-based criterion and viscoplastic is used to describe the material behavior in the bulk material. Material fracture is simply modeled by breaking bonds between neighboring particles. The method is applied to fracture of cylindrical thin structures under explosive loading. The loading is modelled by a pressure-time history. Comparisons between the computational results and experimental data illustrate the validity and robustness of the proposed method. © 2014 Y. Shie.

Liu L.,Harbin Engineering University | Namikoshi T.,Kitami Institute of Technology | Zang Y.,Niigata University | Aoki T.,Niigata University | And 6 more authors.
Journal of the American Chemical Society | Year: 2013

A novel, highly selective photocyclic aromatization (SCAT) of π-conjugated polymers from phenylacetylene having two hydroxyl groups to exclusively yield a 1,3,5-trisubstituted benzene derivative was developed, and its success was confirmed by 1H NMR, GPC, and TOF-MS. The SCAT reaction has many unique characteristics. (1) It is a quantitative reaction: it gave only the corresponding cyclic trimer, i.e., a 1,3,5-trisubstituted benzene derivative, quantitatively (100%). No byproducts were produced under the best conditions. (2) It is an intramolecular reaction: it occurred between three adjacent monomer units in one macromolecule. (3) It is a stereospecific and topochemical or template reaction: the reactivity strongly depended on the configuration and conformation of the starting polymer substrates. (4) It is a photoreaction: high selectivity (100%) was observed only by the use of visible light irradiation, not by heating. (5) It is a solid-state reaction: high selectivity (100%) was observed only in the solid state, not in solution. In addition, (6) the resulting cyclic trimers could form a self-supporting membrane, despite their low molecular weights. This new approach resulted in a new class of supramolecular polymers consisting of a 1,3,5-trisubstituted benzene derivative, numbers of which were linearly linked by hydrogen bonds and stacked benzene derivatives. Since SCAT has such high selectivities and is useful for the preparation of a self-supporting supramolecular polymer membrane, many applications can be expected. © 2012 American Chemical Society.

Wang J.-W.,Beihang University | Wu H.-N.,Beihang University | Guo L.,Beihang University | Luo Y.-S.,Harbin Engineering University
Fuzzy Sets and Systems | Year: 2013

This paper investigates the problem of robust H ∞ fuzzy control for a class of uncertain nonlinear Markovian jump systems with time-varying delay. The class of systems under consideration is described by the Takagi-Sugeno fuzzy model. The goal of the paper is to design a mode-dependent fuzzy state-feedback controller such that the closed-loop system is stochastically stable with a prescribed H ∞ performance of disturbance attenuation for all admissible parameter uncertainties. In order to obtain a less conservative control design, a new stochastic Lyapunov-Krasovskii functional is first constructed by decomposing the delay interval into multiple equidistant subintervals. Then, by employing this functional, a delay decomposition approach to the design of robust H ∞ fuzzy controllers is developed in terms of linear matrix inequalities. Finally, two examples are given to illustrate the merit and usability of the proposed design method. © 2012 Elsevier B.V.

Liu W.,Harbin Engineering University
Applied Mathematics and Information Sciences | Year: 2013

The paper conducts a research on dynamic comprehensive evaluation model from a view of syncretizing the state and the trend of evaluated objects based on the niche theory. The approach adopted in the paper is a quantitative technique based on use of mathematical modeling; the state evaluation is used for describing development state of evaluated objects from a view of integral, while the trend evaluation is used for describing development trend from a view of considering change speed of evaluated objects. On this basis, a dynamic comprehensive evaluation model is constructed, in which the state and the trend of evaluated objects are syncretized. Finally, a calculation example is pulled into to illustrate the feasibility and availability of dynamic comprehensive evaluation model from the empirical perspective. © 2013 NSP Natural Sciences Publishing Cor.

Yang X.T.,Harbin Engineering University | Yao B.Y.,Harbin Institute of Technology
Optik | Year: 2014

We reported the Ho:GdVO4 laser pumped by Tm-doped laser with a fiber Bragg grating. 2.03 W continuous-wave Ho:GdVO4 laser output power is obtained under 10.5 W incident pump power, with the optical-to-optical conversion efficiency and slope efficiency of 19.3% and 32.3%, respectively, at 7 °C. We can see that, the lower the temperature is, the better the laser output character is. The beam quality factor is M2 ∼ 1.29 measured by the traveling knife-edge method. © 2014 Elsevier GmbH. All rights reserved.

Feng D.,Harbin Engineering University
WIT Transactions on Information and Communication Technologies | Year: 2014

In this paper, we utilize visual-based program to learn and develop table tennis skills and decision-making ability. We have classified 30 participants into 3 groups (beginners, intermediate, and advanced groups). Participants from professional team, college students, athletes, and primary schools are served for once a week altogether 10 weeks experimentation, to examine the changes in cognitive performance. Results indicated an improvement with all groups, specifically the beginner group. Overall, this study demonstrates the effectiveness of visual-based training in table tennis. © 2014 WIT Press.

Okamoto Y.,Nagoya University | Okamoto Y.,Harbin Engineering University
Advances in Polymer Science | Year: 2013

The separation of enantiomers by high-performance liquid chromatography (HPLC) using the helical polymers mainly synthesized in my group over the past 40 years is described. In 1979, a one-handed helical poly(triphenylmethyl methacrylate) (PTrMA) was synthesized by asymmetric anionic polymerization. This is the first example of the asymmetric synthesis of a one-handed helical polymer, and the polymer exhibited an unexpected high chiral recognition to many racemates. A practically useful chiral stationary phase (CSP) for HPLC was developed by coating the polymer on silica gel. In 1982, the CSP was commercialized as the first chiral column based on a chiral polymer. Following this study, various helical polymers have been synthesized for use as CSPs by many researchers including ourselves and, in many cases, the helical structure of the polymers has played an important role in chiral recognition. In 1984, we found that cellulose trisphenylcarbamate coated on silica gel showed a very high chiral recognition and afforded a very useful CSP. Among the many phenylcarbamate derivatives of cellulose and amylose, the tris(3,5- dimethylphenylcarbamate)s show very attractive abilities. Today, these polysaccharide-based CSPs are most frequently used to analyze or preparatively separate chiral compounds. © Springer-Verlag Berlin Heidelberg 2013.

Xu H.,Wayne State University | Du J.,Harbin Engineering University | Li W.L.,Wayne State University
Journal of Sound and Vibration | Year: 2010

This paper presents an analytical method for the vibration analysis of plates reinforced by any number of beams of arbitrary lengths and placement angles. Both the plate and stiffening beams are generally modeled as three-dimensional (3-D) structures having six displacement components at a point, and the coupling at an interface is genetically described by a set of distributed elastic springs. Each of the displacement functions is here invariably expressed as a modified Fourier series, which consists of a standard Fourier cosine series plus several supplementary series/functions used to ensure and improve uniform convergence of the series representation. Unlike most existing techniques, the current method offers a unified solution to the vibration problems for a wide spectrum of stiffened plates, regardless of their boundary conditions, coupling conditions, and reinforcement configurations. Several numerical examples are presented to validate the methodology and demonstrate the effect on modal parameters for a stiffened plate with various boundary conditions, coupling conditions, and reinforcement configurations. © 2010 Elsevier Ltd. All rights reserved.

Chow W.K.,Hong Kong Polytechnic University | Gao Y.,Harbin Engineering University
Building and Environment | Year: 2011

Natural vents are commonly installed in buildings for smoke control. Air motion is induced by buoyancy of the thermal sources inside the building. Hot smoke is expected to be exhausted out of the vent. However, directions of air flowing across the vent might be oscillating under some conditions. The ratio B of buoyancy to inertial force defined by the Grashof number over the square of the Reynolds number is the key parameter in determining airflow oscillations.In this paper, effects of buoyancy, pressure, and the combined effect of buoyancy and pressure denoted by B will be studied by simple flow equations. A room fire with a horizontal vent is taken as an example. The results indicate that pressure is the driving force for the airflow oscillations when B < 0.1. Buoyancy is the dominating factor when B > 10. However, the combined effect of pressure and buoyancy is important when B is close to 1. Results are useful for designing smoke exhaust systems with natural vents. © 2010 Elsevier Ltd.

Zhang X.,Northeast Forestry University | Wu X.,Harbin Engineering University
Computational Materials Science | Year: 2016

We use non-equilibrium molecular dynamics (NEMD) simulations to compute thermal conductivity of Ge thin films with rough surface. The analysis shows that the shape, height, and length of the surface roughness have an appreciable influence on the in-plane and cross-plane thermal conductivity of Ge thin films. The thermal conductivity significantly decreases with increasing the period height of roughness or with decreasing the period length of roughness. Phonon-boundary scattering mechanism could be used to explain our results. © 2016 Elsevier B.V.

Schaller G.R.,University of Kiel | Topic F.,University of Jyvaskyla | Rissanen K.,University of Jyvaskyla | Okamoto Y.,Nagoya University | And 2 more authors.
Nature Chemistry | Year: 2014

As long as 50 years ago theoretical calculations predicted that Möbius annulenes with only one π surface and one edge would exhibit peculiar electronic properties and violate the Hückel rules. Numerous synthetic attempts notwithstanding, the first singly twisted Möbius annulene was not prepared until 2003. Here we present a general, rational strategy to synthesize triply or even more highly twisted cyclic π systems. We apply this strategy to the preparation of a triply twisted [24]dehydroannulene, the structure of which was confirmed by X-ray analysis. Our strategy is based on the topological transformation of 'twist' into 'writhe'. The advantage is twofold: the product exhibits a lower degree of strain and precursors can be designed that inherently include the writhe, which, after cyclization, ends up in the Möbius product. With our strategy, triply twisted systems are easier to prepare than their singly twisted counterparts. © 2014 Macmillan Publishers Limited.

Yao J.,Harbin Engineering University | Wang C.,China Shipbuilding Industry Corporation
JVC/Journal of Vibration and Control | Year: 2012

This work is focused on an underwater manipulator. To solve its nonlinear dynamics and hydrodynamics when it operates underwater, model reference adaptive control (MRAC) is applied. The output of the reference model represents the expected transient response. Adaptive controller parameters are adjusted on-line in real time according to the error between the reference model output and the system output and the outputs of the state filters, using an adaptive parameter regulator. The system control input is thus achieved such that the system output can track the reference model output. Simulation results demonstrate that the proposed control scheme has accurate tracking ability and can greatly improve the dynamic and static properties of the system. The MRAC for the underwater manipulator is also fairly robust to load disturbance and system parameter variation. © 2011 The Author(s).

Ding M.,Technical University of Delft | Ding M.,Harbin Engineering University | Kloosterman J.L.,Technical University of Delft
Nuclear Engineering and Design | Year: 2011

Small high temperature gas-cooled reactors (HTRs) have the advantages of transportability, modular construction and flexible site selection. This paper presents the neutronic feasibility design of a 20 MWth U-Battery, which is a long-life block-type HTR. Key design parameters and possible reactor core configurations of the U-Battery were investigated by SCALE 5.1. The design parameters analyzed include fuel enrichment, the packing fraction of TRISO particles, the radii of fuel compacts and kernels, and the thicknesses of top and bottom reflectors. Possible reactor core configurations investigated include five cylindrical, two annular and four scatter reactor cores for the U-Battery. The neutronic design shows that the 20 MWth U-Battery with a 10-year lifetime is feasible using less than 20 enriched uranium, while the negative values of the temperature coefficients of reactivity partly ensure the inherent safety of the U-Battery. The higher the fuel enrichment and the packing fraction of TRISO particles are, the lower the reactivity swing during 10 years will be. There is an optimum radius of fuel kernels for each value of the fuel compact design parameter (i.e.; radius) and a specific fuel lifetime. Moreover, the radius of fuel kernels has a small influence on the infinite multiplication factor of a typical fuel block in the range of 0.2-0.25 mm, when the radius of fuel compacts is 0.6225 cm and the lifetime of the fuel block is 10 years. The comparison of the cylindrical reactor cores with the non-cylindrical ones shows that neutron under-moderation is a basic neutronic characteristic of the reactor core of the U-Battery. Increasing neutron moderation by replacing fuel blocks with graphite blocks and dispersing the graphite blocks in the reactor core are two effective ways to increase the fuel burnup and lifetime of the U-Battery. Water or steam ingress may induce positive reactivity ranging from 0 to 0.16 Δk/k, which further demonstrates that the U-Battery is under-moderated. © 2011 Elsevier B.V. All rights reserved.

Shi D.,Harbin Engineering University
Proceedings of Meetings on Acoustics | Year: 2013

Dynamic behavior of annular sector plate is an important research topic since they have been extensively used in practical engineering applications. However, the dynamic analysis of annular sector plates with general boundary supports is rarely studied in literature. In this investigation, an analytical method is presented for the vibration analysis of annular sector plates with general elastic boundary supports. Unlike most existing framework, arbitrary elastic boundary supports can be easily realized by setting the stiffness of the two types restraining springs. The displacement field is universally expressed as a new form of trigonometric series expansions with a drastically improved convergence as compared with the conventional Fourier series. Mathematically, such a double Furies series is capable of representing any function (including the exact displacement solution) whose third-order partial derivatives are continuous over the area of the plate. Thus, the double Fourier series solution to the dynamic analysis of the structure is obtained by employing the Raleigh-Ritz metod. The accuracy and reliability of the current method are validated by both FEA and reference results under various boundary conditions. The present method can be directly applied to other more complicated boundary conditions and other shape plates. © 2013 Acoustical Society of America.

Gao H.-Y.,Harbin Engineering University | Cao J.-L.,Beijing University of Posts and Telecommunications
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Based on artificial bee colony algorithm and quantum computing, a novel quantum-inspired bee colony optimization (QBCO) algorithm was proposed for the discrete combinatorial optimization problems. In QBCO, two new quantum foraging behaviors were used to find the optimal location of nectar by co-evolution of quantum bee colony. The excellent performance of the QBCO algorithm was proved through some classical benchmark functions. At the same time, an assignment method for cognitive radio spectrum allocation based on QBCO was designed. Simulations were conducted to compare this method with genetic algorithm (GA), quantum genetic algorithm (QGA), particle swarm optimization(PSO) and color-sensitive graph coloring (CSGC) using different network utility functions. The simulation results show that our method can find the near-optimal solution and outperforms previous classic spectrum allocation method and intelligence spectrum allocation methods.

Zhang X.,Harbin Institute of Technology | Zhang X.,Harbin Engineering University
Journal of Control Theory and Applications | Year: 2012

This paper investigates the attitude tracking and disturbance rejection problem of rigid spacecraft. Using a new matrix product, i. e., the semitensor product of matrices, the parameter uncertainties in the inertia matrix is isolated. Both the parameter uncertainties and the external disturbance are handled by robust adaptive control method. By combining the semitensor product of matrices, backstepping control methodology, and adaptive control technique, a new adaptive control law is designed. Simulation result is also presented to demonstrate the proposed design method. © 2012 South China University of Technology, Academy of Mathematics and Systems Science, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.

Han H.,Harbin Engineering University | Li B.,Harbin Institute of Technology | Shao W.,Harbin Institute of Technology
Applied Thermal Engineering | Year: 2014

Multi-objective optimal designs of high efficiency corrugated tube heat exchangers applied in nuclear plants are presented in this paper. Dimensionless corrugation pitch (p/D), dimensionless corrugation height (H/D), dimensionless corrugation radius (r/D) and Reynolds number (Re) were considered as four design parameters. The analyses of heat transfer characteristic, resistance characteristic and overall heat transfer performance for the corrugated tube were conducted based on CFD to acquire the objective functions (Nuc, fc, Nuc/Nus, fc/fs and η in this paper) for combination of process parameters. The Response surface methodology (RSM) with Central composite design (CCD) was used to identify the relationships between the objective functions and the design variables. Variance of the linear term, quadratic term and interactive term for design parameters in the response variables were analyzed. Response surface analyses were applied to visualize the effects of the interactive term. The results of optimal designs are a set of multiple optimum solutions, called 'Pareto optimal solutions'. It reveals that augmenting the heat transfer performance caused by various design parameters in the optimum situation would lead to the increase of the resistance. The optimum values of fc/fs = 1.22 and η = 1.42 are obtained in the condition of specific (fixed) Nuc/Nu s ≤ 1.2. © 2014 Elsevier Ltd. All rights reserved.

Gao X.-Z.,Aalto University | Xu H.,Harbin Engineering University | Wang X.,Aalto University | Zenger K.,Aalto University
International Journal of Innovative Computing, Information and Control | Year: 2013

In this paper, we present a comprehensive study of the Negative Selection Algorithm, (NSA)-based motor fault detection and diagnosis. The NSA only needs the feature signals of the healthy motors for generating the motor fault detectors. Different from the conventional fault detection approaches, no prior knowledge of the motor fault types is assumed to be known beforehand. Based on the motor fault detection results, the NSA can be further applied for the fault diagnosis. The applicability of our motor fault detection and diagnosis method is examined using the Fisher's iris data classification and three real-world motor fault detection and diagnosis problems in computer simulations. © 2013 ICIC International.

Wu W.,Harbin Engineering University
Knowledge-Based Systems | Year: 2015

Abstract We address the problem of reducing classification error in a CAD system: given a small set of training examples with multiple labels from annotators whose reliabilities are unknown, the objective is to learn an effective classification model with as few mistakes as possible on other unlabeled examples. The problem usually occurs in the situation that there are no labeled examples to be utilized as "golden-standard" for testing the classification model or annotators. We propose an active scheme of obtaining an accurate classifier for CAD systems, by reducing classification error from two aspects of example and label selection. In every step of the iterative process, the classifier can automatic submit the most helpful examples of all to the annotators who are most likely to provide correct labels. The proposed scheme has been tested on two breast cancer datasets. Experimental results show that the proposed algorithm can achieve better accuracy than other existing methods. © 2015 Elsevier B.V. All rights reserved.

Ni B.,Harbin Engineering University
11th World Congress on Computational Mechanics, WCCM 2014, 5th European Conference on Computational Mechanics, ECCM 2014 and 6th European Conference on Computational Fluid Dynamics, ECFD 2014 | Year: 2014

The evolution and dynamics of a bubble attached and sliding on an axisymmetric cylinder is simulated and analyzed based on velocity potential theory. The intersection points of the bubble and the body are treated specially by the numerical technique and a widely applicable code is obtained based on Boundary Element Method (BEM). The variation of the bubble pressure with its volume is taken into account. Fully nonlinear dynamic and kinematic conditions are imposed on the bubble surface. A typical case is studied and the dynamic responses of the bubble, body and the flow field are simulated. The effects of initial bubble volume on the interactions are investigated. It is aimed that the results from this paper would provide some insight into the drag reduction on marine vehicles through using bubbles and air cavity.

Nie raises a number of problems regarding our report on the ideal cleavage fracture of Cr2Nb, and thinks that the computational model is not accurate. Here, we reply these problems and provide some evidence to prove that the computational model is accurate. © 2010 Elsevier Ltd. All rights reserved.

A new fuel injection equipment, the Electronic In-line Pump (EIP) system has been developed in this paper, in order to meet The China's PHASE III and IV emission legislations. The EIP is a product which is assembled together by mechanical hydraulic and electrical magnetic system, and it includes electronic magnetic pump and electronic magnetic injector. The fluctuation in cycle fuel injection quantity (CFIQ) influences not only on the coherence of the product performance, but also on the quality qualification rate of the product. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics, i.e. injection pressure, injection rate, injection duration at different operating conditions, etc. To validate these predictions, experimental tests were conducted at the same model conditions. The results are quite encouraging, and in agreement with model predictions. The influence of the parameters such as fluctuation of supply fuel pressure, cam velocity, plunger matching clearance, peak control current, anchor residual clearance, valve matching clearance, valve lift, injector opening pressure, nozzle flow coefficient, injector needle lift, etc on cycle fuel injection quantity fluctuation (CFIQF) has been analyzed in detail by the AMESim simulation model. The quantitative percentage index of the influence of different parameters on CFIQF, namely, the influence percentage of injector characteristic parameters are from 44% to 34%, valve characteristic parameters are from 20% to 35%, plunger characteristic parameters are from 32% to 19%, and low pressure supply fuel characteristic parameters are form 4% to 12% with the cam rotate speed from 500r/min to 1300r/min. Based on the design of experiment (DOE) method, take the interaction into consideration, system model has been built in the Modeling and design environment (MODDE), the correlations of CFIQ and different factors have been analyzed and the correlation coefficients of CFIQ and different factors are obtained. The result shows that correlation not only exists between the single factor of parameter and CFIQ, also exists between interaction factor of parameter and CFIQ. Copyright © 2010 SAE International.

Wang Q.,Harbin Normal University | Zhao B.,Harbin Normal University | Zhang S.,Harbin Engineering University | Gao X.,Northeast Agricultural University | Deng C.,Harbin Normal University
Journal of Materials Chemistry A | Year: 2015

Tailoring materials into a hierarchical porous micro/nanostructure offers unprecedented opportunities in the utilization of their functional properties. Particularly, it is crucial for the electrode materials to realize high-performance because of the advantages such as large surface area, superior structure stability and short ion transport pathway. Here we report the design of a new architecture, named "honeycomb-type hierarchical porous microball", for Na3V2(PO4)3 by a facile one-pot synthesis. The network between nanovoids is formed by in situ carbonization of surfactants (CTAB) along with the crystallization of Na3V2(PO4)3, which results in the hierarchical porous Na3V2(PO4)3 skeleton with a surface conductive layer. The prepared Na3V2(PO4)3/C composite consists of spherical particles filled with hierarchical pores and interconnective nanochannels, resulting in the honeycomb-type architecture. It not only enables easier electrolyte penetration, but also provides a high-efficiency electron/ion transport pathway for fast sodium intercalation. Both the GITT and EIS results demonstrate the improved sodium diffusion capability and decreased electrochemical resistance for the honeycomb-structured microball in comparison to the microsized nonporous reference samples. Moreover, it also delivers superior high rate capability and cycling stability, which retains 93.6% of the initial capacity after 200 cycles at the 1 C rate. Even at 20 C, it still delivers a high capacity of 80.2 mA h g-1 corresponding to 71% of the capacity. Given the superior ion intercalation kinetics and excellent structure stability, the honeycomb-type structure puts forward a new strategy to develop high-performance polyanion-based materials for low-cost and high-power "rocking-chair" batteries. © The Royal Society of Chemistry 2015.

Yan M.F.,Harbin Institute of Technology | Wu Y.Q.,Harbin Institute of Technology | Liu R.L.,Harbin Engineering University
Applied Surface Science | Year: 2013

The nanocrystallized 18Ni maraging steel was plasma nitrocarburized at 460 °C for 4 h in a mixture gas of N2, H2 and C 2H5OH. The surface phase compositions of the specimens were analyzed using X-ray diffractometer. The grain shape and size, and grain boundaries in the subsurface layers of the samples were characterized by electron backscattering diffraction and transmission electron microscopy. The results show that the nitrocarburized layers are composed of α-Fe, γ′-Fe4N and FeN0.049 phases. Most α-Fe and γ′-Fe4N grains show in columnar shape. The major and minor axes of some α-Fe grains are elongated and shortened after nitrocarburizing, respectively. In the subsurface layers of the untreated and nitrocarburized specimens, the average areas of γ′-Fe4N and α-Fe grains both with a dimension of nanometer are 0.395 μm 2 and 0.397 μm2, respectively. The γ′- Fe4N grain boundaries are mainly high angle boundaries with a very small fraction of low angle boundaries. Coincidence site lattice boundaries in the subsurface layer of the untreated specimen are composed mainly of Σ3, Σ11 and Σ13b, and their fraction decreases after nitrocarburizing. © 2013 Elsevier B.V. All rights reserved.

Li Y.,Harbin Engineering University | Li W.,Pennsylvania State University | Yu W.,Pennsylvania State University
Applied Computational Electromagnetics Society Journal | Year: 2012

A coplanar waveguide (CPW) fed ultra wideband (UWB) antenna with switchable functions and notched band characteristics for multi-mode wireless communication applications is proposed in this paper. The proposed UWB antenna has two stop bands which are achieved by using stepped impedance stub (SIS) loaded stepped impedance resonators (SIR) and SIS loaded hexagon stepped impedance resonators (HSIR). The switchable characteristics are obtained by employing two ideal switches on SISHSIR and SIS-SIR. By controlling the two switches ON and OFF, the proposed UWB antenna can work in multiple modes. The proposed switchable UWB antennas have been designed, analyzed, fabricated and measured. Simulated and experimental results show that the proposed antenna has switchable characteristics, tunable notch band functions and good radiation patterns. The proposed switchable UWB slot antenna can be used as a multi-mode antenna for multiple protocol communications. © 2012 ACES.

Zhao B.,Harbin Normal University | Wang Q.,Harbin Normal University | Zhang S.,Harbin Engineering University | Deng C.,Harbin Normal University
Journal of Materials Chemistry A | Year: 2015

The three-dimensional (3D) hierarchical porous structure is ideal for constructing high-performance electrode materials and offers advantages such as large surface area, stable structural integrity and efficient ionic transport. In this report, we prepared a novel wafer-like 3D porous structured NaTi2(PO4)3/C by a facile self-assembled strategy. The NaTi2(PO4)3 crystal was not only coated by a nanoscale carbon layer but was also embedded in a microscale carbon network, which self-assembled into a secondary particle in a plate-like shape. The hierarchical carbon in the plate-like particle constitutes a 3D porous framework with a bicontinuous electronic conductive skeleton, showing a wafer-like structure. When used as an anode in an aqueous system, the wafer-like composite exhibited better sodium intercalation kinetics and enhanced high-rate capability than nonporous samples. Moreover, a full aqueous rechargeable sodium battery was fabricated using the wafer-like NaTi2(PO4)3 as the anode and Na0.44MnO2 as the cathode. The cell exhibited superior high rate property and an ultralong-life performance, which delivered 64% capacity at 30 C and retained 67% capacity after 400 cycles at alternate 50 and 5 C. In view of the highly efficient electron/ion transport pathways and robust structure stability, the wafer-like structure is put forward as a new strategy for nanoarchitecture tailoring to achieve high-performance electrodes. © The Royal Society of Chemistry 2015.

Zhao B.,Harbin Normal University | Lin B.,Harbin Normal University | Zhang S.,Harbin Engineering University | Deng C.,Harbin Normal University
Nanoscale | Year: 2015

Hollow micro/nano-arrays have attracted tremendous attention in the field of energy conversion and storage, but such structures usually compromise the volumetric energy density of the electrode materials. Frogspawn consists of a spawn core and a transparent jelly shell organized in a hierarchical porous array, which exhibits superior mechanical strength and high-efficiency oxygen permeability. It can be used as a model for designing a new high-performance electrode material, which has advantages such as a high surface area, fast mass transport and superior durability. Herein, we report a frogspawn-like NaTi2(PO4)3/C array prepared by a facile preform impregnation strategy. The framework is formed by a hollow carbon sphere connected by the NaTi2(PO4)3/C skeleton, and its hollow is filled with the NaTi2(PO4)3 nanospheres. The whole hierarchical porous three-dimensional array copies the structure of a frogspawn. This unique structure not only enables easy electrolyte percolation and fast electron/ion transport, but also enhances the reversible capacity and cycling durability. When it is applied as an anode of the aqueous sodium ion battery, it exhibits favorable high rate capability and superior cycling stability, and retains 89% of the initial capacity after two thousand cycles at 20 C. Moreover, the full cell using the frogspawn-inspired NaTi2(PO4)3-C as the anode and Na0.44MnO2 as the cathode is capable of ultralong cycling up to one thousand cycles at alternate 10 and 60 C, which is among the best of state-of-the-art aqueous sodium ion systems. Therefore, the frogspawn-inspired architecture provides a new strategy to the tailored design of polyanion materials for high-power applications. © 2015 The Royal Society of Chemistry.

Xin Z.,Harbin Engineering University
Electronic Journal of Geotechnical Engineering | Year: 2015

Fatigue has long been recognized as an important consideration for designing offshore structures. In this paper, fatigue life assessment for welded tubular joints of a jack-up platforms is numerically assessed as part of mitigation for platform life time. The analysis procedures are presented for numerical fatigue assessment methods based on S-N curve approach for ABS standard utilizing the spectral (stochastic) method. The objective of this analysis is to verify that the pile leg of a jack-up platform has the appropriate fatigue life referring to the expected design life of twenty (20) years. The results are discussed and summarized through tables. © 2015 ejge.

Wang Y.,Harbin Engineering University
Multimedia, Communication and Computing Application - Proceedings of the International Conference on Multimedia, Communication and Computing Application, MCCA 2014 | Year: 2015

Under the atmospheric turbulence, the relationship between the BER performance of ultraviolet communication system and angle parameters of system is studied. The results show that the BER performance is deteriorated with the increase of the transmitter apex angle and the receiver apex angle. The effect of the transmitter beam divergence on the BER performance is very weak. In addition, The BER performance can be greatly improved when the receiver field view is increased. © 2015 Taylor & Francis Group, London.

Wang Y.,Harbin Engineering University | Wang Y.,University of Southampton | Liu S.,Hong Kong Polytechnic University | Tan X.,Ningbo University | Jin W.,Hong Kong Polytechnic University
Journal of Lightwave Technology | Year: 2010

A versatile technique is demonstrated to fill selectively a fluid into desired air holes in a microstructured optical fibers (MOFs). A fan-shaped groove is carved on the fiber surface to expose selected air holes to atmosphere by a micromachining system consisting of a femtosecond IR laser and a microscope. Then a fluid is filled into the exposed air holes through the carved groove with the well-known capillarity action. Such a technique can be used to fill selectively several different types of fluid samples into desired air holes in an MOF by means of carving fan-shaped grooves on different orientations of the fiber surface. © 2006 IEEE.

Yi F.,Harbin Engineering University | Liu J.,Harbin Institute of Technology | Wei J.,Harbin Institute of Technology
Nonlinear Analysis: Real World Applications | Year: 2010

In this paper, we have investigated a homogeneous reactiondiffusion bimolecular model with autocatalysis and saturation law subject to Neumann boundary conditions. We mainly consider Hopf bifurcations and steady state bifurcations which bifurcate from the unique constant positive equilibrium solution of the system. Our results suggest the existence of spatially non-homogeneous periodic orbits and non-constant positive steady state solutions, which implies the possibility of rich spatiotemporal patterns in this diffusive biomolecular system. Numerical examples are presented to support our theoretical analysis. © 2009 Elsevier Ltd. All rights reserved.

Liu J.,Harbin Institute of Technology | Yi F.,Harbin Engineering University | Wei J.,Harbin Institute of Technology
International Journal of Bifurcation and Chaos | Year: 2010

A reaction-diffusion Gierer-Meinhardt model of morphogenesis subject to Dirichlet fixed boundary condition in the one-dimensional spatial domain is considered. We perform a detailed Hopf bifurcation analysis and steady state bifurcation analysis to the system. Our results suggest the existence of spatially nonhomogenous periodic orbits and nonconstant positive steady state solutions, which imply the possibility of complex spatiotemporal patterns of the system. Numerical simulations are carried out to support our theoretical analysis. © 2010 World Scientific Publishing Company.

Wang Q.,Hong Kong Polytechnic University | Shi W.,Hong Kong Polytechnic University | Shi W.,Wuhan University | Wang L.,Harbin Engineering University
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2014

Subpixel mapping (SPM) is a technique for predicting the spatial distribution of land cover classes in remote sensing images at a finer spatial resolution level than those of the input images. Indicator cokriging (ICK) has been found to be an effective and efficient SPM method. The accuracy of this model, however, is limited by insufficient constraints. In this paper, the accuracy of the ICK-based SPM model is enhanced by using additional information gained from multiple shifted images (MSIs). First, each shifted image is utilized to compute the conditional probability of class occurrence at any fine spatial resolution pixel (i.e., subpixel) using ICK, and a set of conditional probability maps for all classes are generated for each image. The multiple ICK-derived conditional probability maps are then integrated, according to the estimated subpixel shifts of MSI. Lastly, class allocation at the subpixel scale is implemented to produce SPM results. The proposed algorithm was tested on two synthetic coarse spatial resolution remote sensing images and a set of real Moderate Resolution Imaging Spectroradiometer (MODIS) data. It was evaluated both visually and quantitatively. The experimental results showed that more accurate SPM results can be generated with MSI than with a single observed coarse image in conventional ICK-based SPM. In addition, the accuracy of the proposed method is higher than that of the existing Hopfield neural network (HNN)-based SPM and the HNN with MSI. © 2008-2012 IEEE.

Jia X.,Beijing Normal University | Jia X.,University of New South Wales | Wang L.,Harbin Engineering University
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2014

While a single spectrum is often used to present a pure class, it is more realistic to consider intra-class spectral variation and model a pure class using a group of its representative spectra. In line with this consideration, crisp unmixing accuracy assessment, where unmixing performance is assessed using a mean squared error of the estimated endmember fractions, can be misleading. In this paper, alterative spectral unmixing assessment methods are introduced to account for the uncertainty contained in the spectral measurements and during the ground truth data collection. Two fuzzy measures are developed to assess unmixing performance. One is fuzzy unmixing fraction error for a realistic assessment and the other is pixel level unmixing accuracy to provide a good quantitative understanding of the unmixing success rates spatially. To demonstrate and illustrate how they work, the two fuzzy measures are applied to evaluate the performance of several spectral unmixing methods including both single spectrum based and multiple spectra based algorithms. Crisp assessments and fuzzy results at various tolerance levels are presented and compared. Based on the realistic measures proposed, it is found the recent developed unmixing method with extended Support Vector Machines outperforms other algorithms tested. © 2013 IEEE.

Zhao J.Q.,Harbin Institute of Technology | Zhao J.Q.,Harbin Engineering University | Wang Y.Z.,Harbin Institute of Technology | Yao B.Q.,Harbin Institute of Technology | Ju Y.L.,Harbin Institute of Technology
Laser Physics Letters | Year: 2010

An efficient single-frequency laser-diode pumped, continuous wave (CW) ring Nd laser emitting at 1064.4 nm is demonstrated. A composite crystal (Nd:YVO4/YVO4) with un-doped ends is single end pumped by a fiber-coupled laser diode (LD) at 808 nm. A four-mirror ring cavity is deigned to keep the laser unidirectional operating, which eliminate spatial hole burning in standing-wave cavity. With the incident pump power of 31.5 W, the obtained output power is 13.6 W, with a slope efficiency of 52.6% and an optical efficiency of 43.2%. At the same time, a beam quality of M2 ∼1.1 is found. © 2010 by Astro Ltd.

Ning G.,China University of Petroleum - Beijing | Xu C.,China University of Petroleum - Beijing | Mu L.,China University of Petroleum - Beijing | Chen G.,China University of Petroleum - Beijing | And 5 more authors.
Chemical Communications | Year: 2012

We report for the first time an experimental investigation of gas storage in porous graphene with nanomeshes. High capacity methane storage (236 v(STP)/v) and a high selectivity to carbon dioxide adsorption were obtained in the nanomesh graphene with a high specific surface area (SSA) and a SSA-lossless tightly stacking manner. © The Royal Society of Chemistry 2012.

Li Y.,Harbin Engineering University
2010 WRI International Conference on Communications and Mobile Computing, CMC 2010 | Year: 2010

With the quick increase of web services on the Internet, how to discover proper services efficiently in a large number of web services becomes more and more difficult. Services discovery efficiency can be improved greatly after services have been classified well, so an algorithm of clustering services which uses graph theory and a corresponding algorithm of discover services are proposed in this paper. The algorithms in this paper are for semantic web services because it is the direction of web services. Ontology is used to represent the I/O parameters of semantic web service to benefit from the advantages of using ontology. © 2010 IEEE.

Wang H.,Harbin Engineering University
International Journal of Computational Methods | Year: 2012

We study the failure mode transition in double-notched and single-notched steel plates under impact loading. For low impact velocities, brittle crack growths is observed while shear bands occur when the speed of the impactor is increased. We employ the meshless reproducing Kernel particle method (RKPM) that is well suited for problems involving large deformation and localization. The key feature of the proposed methodology is that it (1) treats brittle and ductile failure in the same manner and (2) employs the same constitutive model and failure criterion for both brittle and ductile failure. Therefore, cracks and shear bands are both treated as strong discontinuity in the context of the RKPM. Material stability analysis performed at every sampling point determines automatically the failure mode. We demonstrate the validity of the method by comparison to experimental data. © 2012 World Scientific Publishing Company.

Shen F.,Harbin Engineering University | Cheong J.W.,University of New South Wales | Dempster A.G.,University of New South Wales
Measurement Science and Technology | Year: 2015

Relative position awareness is a vital premise for the implementation of emerging intelligent transportation systems, such as collision warning. However, commercial global navigation satellite systems (GNSS) receivers do not satisfy the requirements of these applications. Fortunately, cooperative positioning (CP) techniques, through sharing the GNSS measurements between vehicles, can improve the performance of relative positioning in a vehicular ad hoc network (VANET). In this paper, while assuming there are no obstacles between vehicles, a new enhanced tightly coupled CP technique is presented by adding ultra-wide bandwidth (UWB)-based inter-vehicular range measurements. In the proposed CP method, each vehicle fuses the GPS measurements and the inter-vehicular range measurements. Based on analytical and experimental results, in the full GPS coverage environment, the new tight integration CP method outperforms the INS-aided tight CP method, tight CP method, and DGPS by 11%, 15%, and 24%, respectively; in the GPS outage scenario, the performance improvement achieves 60%, 65%, and 73%, respectively. © 2015 IOP Publishing Ltd.

Xuemei H.,Harbin Engineering University
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2010

Lower level machines of production line are mainly controlled by PLC and CNC. Reconfiguration control mechanism and implementation of these two kinds controller have its own way due to different characteristics of individual control domain. Combining them totally in one production line manufacturing environment to form reconfigurable control architecture in system level is focused on. First reconfigurable control for single PLC and CNC controller is studied. Transformation rules from IEC 61131 standard to IEC 61499 reference structure and STEP-NC compliant reconfigurable numerical controller are respectively studied to implement reconfigurable control for single PLC and CNC based machines. And on this basis an extensive IEC 61499 compliant software architecture for reconfigurable control of lower level machines in networked manufacturing of production line is proposed by considering systematic reconfiguration requirement and philosophy in production line environment. © 2010 IEEE.

Xu G.D.,Harbin Engineering University | Meng Q.,University College London
Engineering Analysis with Boundary Elements | Year: 2016

The waves generated by a two-dimensional (2D) foil moving in shallow water at subcritical, super-critical and hyper-critical speeds have been investigated. The velocity potential theory is adopted to prescribe the flow with vortex shedding. The fluid-structure interaction, as well as the fully nonlinear free surface movement, is tackled by the mixed-Euler-Lagrangian method through a time stepping scheme. It has been observed that upstream solitary waves emerge when the depth Froude number FH=U(gH)-0.5 approaching the critical value (≥1.0), where U is the speed of the foil, g is the gravitational acceleration and H is the depth of quiescent water. The transition from sub-critical to the super-critical state is studied. As FH keeps increasing to a hyper-critical state, a single upstream soliton is caught up with by the foil. When the foil travels with a negative attack angle at hyper-critical speed, a 'reversed soliton' has been found. © 2015 Elsevier Ltd. All Rights Reserved.

Gato C.,Harbin Engineering University
Thin-Walled Structures | Year: 2010

Analysis and reliability assessment of fracturing thin-walled structures is important in engineering science. We focus on numerical analysis of dynamic fracture of thin-walled structures such as pipes and pressure vessels. Instead of using finite element method, we propose meshfree method that has advantages because its higher order continuity and smoothness and its opportunities to model fracture in a simple way. Therefore, connectivity between adjacent nodes are simply removed once fracture criterion is met. The main advantage of our meshfree method is its simplicity and robustness. © 2009 Elsevier Ltd. All rights reserved.

Zheng L.,Harbin Engineering University | Shi D.,Middlesex University
Computer Vision and Image Understanding | Year: 2011

Straight line detection is common in computer vision. The Radon transform has received much attention for its efficiency and accuracy compared to the Hough transform. In this paper, a generalized interpolated Fourier transform, hereafter called GIFT, is proposed to speed up the Radon transform. Based on the GIFT, a methodology that can detect straight lines from a gray scale image without any pre-processing is implemented. Two contributions can be claimed. First, the recent work by Pan et al. is reinterpreted and implemented in a clearer way so the traditional Fourier transform can be interpolated to achieve an accurate sampling in the frequency domain. Second, the interpolated Fourier transform is further generalized with flexible parameter determination in two dimensions when applied to 2-D images. The experiments demonstrate that our proposed methodology outperforms the standard Radon transform with lower computational load and higher accuracy. The experiments also show that the GIFT line detector can compete against the random sample consensus, which is a robust estimator popularly used in the field of computer vision. © 2010 Elsevier Inc. All rights reserved.

Ji Z.L.,Harbin Engineering University
Engineering Analysis with Boundary Elements | Year: 2010

The substructure boundary element approach is developed to predict and analyze the acoustic attenuation characteristics of hybrid expansion chamber silencers with perforated facing. The silencers are divided into a number of acoustic domains with single medium (air or sound-absorbing material), and treating the sound-absorbing material as an equivalent fluid with complex-valued density and speed of sound (or complex-valued characteristic impedance and wavenumber), and then the boundary element method (BEM) may be applied to each domain leading to a system of equations in terms of acoustic pressure and particle velocity. Using the specific acoustic impedance of perforate, which takes into account the effect of sound-absorbing material, the relationship of acoustic pressures and particle velocities between the inlet and outlet of silencer may be obtained and then transmission loss is determined. For the straight-through perforated tube reactive and dissipative silencers, the predictions of transmission loss agree reasonably well with experimental measurements available in the literature, which demonstrated the applicability and accuracy of the present approach. The BEM is then used to investigate the effect of internal structure on the acoustic attenuation characteristics of hybrid expansion chamber silencers with perforated facing. The numerical results demonstrated that the hybrid expansion chambers may provide higher acoustic attenuation than the reactive expansion chamber in the mid to high frequency range. © 2010 Elsevier Ltd. All rights reserved.

Ning G.,China University of Petroleum - Beijing | Fan Z.,Harbin Engineering University | Wang G.,China University of Petroleum - Beijing | Gao J.,China University of Petroleum - Beijing | And 2 more authors.
Chemical Communications | Year: 2011

Graphene that had nanomeshes, only one to two graphene layers, and specific surface areas of up to 1654 m 2 g -1 was produced on gram-scale by template growth on porous MgO layers. Its unique porous structure gave excellent electrochemical capacitance (up to 255 F g -1), cycle stability and rate performance. © 2011 The Royal Society of Chemistry.

Xue X.-Y.,Northeastern University China | Yuan S.,Northeastern University China | Xing L.-L.,Northeastern University China | Chen Z.-H.,Northeastern University China | And 2 more authors.
Chemical Communications | Year: 2011

Ultrafast charging/discharging of lithium-ion battery anodes is realized from porous Co3O4 nanoneedle arrays growing on copper foils. Their charge time can be shortened to ∼6 s, their reversible capacity at 0.5C rate is 1167 mAh/g. This implies that nano-arrays growing directly on copper foils are good candidates for anodes. © The Royal Society of Chemistry 2011.

Xue X.-Y.,Northeastern University China | Chen Z.-H.,Northeastern University China | Xing L.-L.,Northeastern University China | Yuan S.,Northeastern University China | Chen Y.-J.,Harbin Engineering University
Chemical Communications | Year: 2011

Extraordinarily high reversible capacity of lithium-ion battery anodes is realized from SnO2/α-MoO3 core-shell nanobelts. The reversible capacity is much higher than traditional theoretical results. Such behavior is attributed to α-MoO3 that makes extra Li 2O reversibly convert to Li+. © 2011 The Royal Society of Chemistry.

Xu F.,Shanghai JiaoTong University | Zou Z.-J.,Shanghai JiaoTong University | Yin J.-C.,Shanghai JiaoTong University | Cao J.,Harbin Engineering University
Ocean Engineering | Year: 2013

An identification method based on support vector machines (SVM) is proposed for modeling nonlinear dynamics of underwater vehicles (UVs), and a typical torpedo-shaped autonomous underwater vehicle (AUV) is employed for the purpose of validation. To obtain the hydrodynamic derivatives of the vehicle and the dynamical models of the thruster and fins, a series of hydrodynamic experiments are conducted by using vertical planar motion mechanism (PMM) and circulating water channel (CWC). Maneuvering simulation is carried out by using the hydrodynamic model obtained from experiments, and SVM is applied to identify the damping terms together with Coriolis and centripetal terms by analyzing the simulation data. By using the identified nonlinear model and experiment-based hydrodynamic model respectively, maneuvering simulations and control applications are implemented. The results are compared to verify the proposed method, and the effectiveness and good generalization performance of SVM in modeling the nonlinear dynamics of UVs are demonstrated. © 2013 Elsevier Ltd. All rights reserved.

Ge B.,Harbin Engineering University | Ge B.,Harbin Institute of Technology | Xue X.,Harbin Institute of Technology | Zhou Q.,Northeast Forestry University
Nonlinear Analysis: Real World Applications | Year: 2011

We studied a nonlinear Dirichlet problem driven by the p(x)-Laplacian and having a nonsmooth potential (hemivariational inequalities). Using a variational method combined with suitable truncation techniques based on nonsmooth critical point theory for locally Lipschitz function, we proved the existence of at least five solutions under the suitable conditions. © 2011 Elsevier Ltd. All rights reserved.

Chow W.K.,Hong Kong Polytechnic University | Zhao J.H.,Harbin Engineering University
Journal of Fire Sciences | Year: 2011

Natural ventilation was provided by tall vertical shafts such as solar chimney while designing some green buildings. For buildings with a tall vertical shaft located in very cold countries, measured pressure difference due to stack effect was up to 300 Pa. Air motion induced by stack effect would give adequate ventilation flow rate. However, stack effect would also give adverse effect if not utilized properly in this green design. Smoke would spread faster to other parts of the building in an accidental fire. Therefore, estimations of stack pressure by simple hydrostatic equation used to be criticized in performance-based design. Further studies are required and will be justified by scale model experiments in this article. Stack effect in a vertical shaft was studied experimentally by a model shaft of size 0.05 × 0.05 m2 and height 2.0 m. Air temperature inside the model was kept at constant values above outdoor by wounding hot electric wires. Vertical air temperature profiles inside and outside of the model at different heights were measured. Measured air pressure difference profiles between indoor and outdoor were then compared with those estimated from the air temperature difference. Results were then applied to justify stack pressure estimations by the hydrostatic models. From this study, hydrostatic equations are confirmed to be acceptable for studying stack pressure in tall vertical shafts. © 2011 The Author(s).

Feng Ma H.,Nanjing Southeast University | Hui Shi J.,Nanjing Southeast University | Hui Shi J.,Harbin Engineering University | Xiang Jiang W.,Nanjing Southeast University | Jun Cui T.,Nanjing Southeast University
Applied Physics Letters | Year: 2012

We experimentally demonstrate that the guiding waves can be perfectly bended and transmitted by using anisotropic zero-index materials (AZIMs). In our experiment, the split-ring resonators are used to realize AZIMs, whose permeability component along the wave propagating direction is designed as zero. Meanwhile, metal patches are designed to realize the artificial magnetic conductors as the boundaries of waveguide. The electric-field distributions are measured by two-dimensional near-field scanning apparatus in the microwave frequency, which show good bending performance as expected by simulations. © 2012 American Institute of Physics.