bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Substrate on Structure and Magnetic Properties of Bi0.9Nd0.1FeO3 Thin Films by Radio Frequency Magnetron Sputtering Method
Authors: Li L.L. , Liu Qiu Xiang , Zou Yan , Tang Xin Gui , Jiang Yan Ping
Published: March 2013

Bi0.9Nd0.1FeO3 (BNFO) films were deposited on Si (100) and (La,Sr)(Al,Ta)O3 (100) (LAST) substrate by radio frequency (RF) magnetron sputtering method respectively. The structure，morphology and magnetic properties were studied. X-ray diffraction (XRD) result indicates that the BNFO films on different substrate adopted different orientation. Cross-section scanning electron microscopy shows that the film thickness is 145 nm．Magnetic properties measurement shows that the film on Si(100) substrate has the larger saturation magnetization (Ms) of 3 686 emu/cm3, while the Ms value of the BNFO films on LSAT(100) substrate is only 1 213 emu/cm3.
Reaction of Magnesium Hydride with Water to Produce Hydrogen
Authors: Chao Chung Hsing , Jen Tien Chien
Published: March 2013

In this paper, magnesium hydride was used to react with water to produce the hydrogen gas. Magnesium hydride is the chemical compound MgH2, which contains 7.66% by weight of hydrogen. Although the concept of reacting chemical hydride with water to produce hydrogen is not new, there have been a number of recent published papers which might be employed to power fuel cell devices for portable applications. Under the room temperature, the hydrolytic reaction between magnesium hydride and water to form a thin-layer of magnesium hydroxide on the outer surface impedes water from coming into direct contact with the magnesium hydride. The key to continual removal of the coherent magnesium hydroxide layer by adding a citric acid has the following conclusions. First, using this approach can reach the 6.4wt% of hydrogen. Finally, the cost of producing hydrogen from magnesium hydride-water hydrogen generation approach would cost approximately $15 per kg hydrogen.
Rapid Discrimination of Fermented Cordyceps Mycelium Powder by Near-Infrared Spectroscopy (NIRS)
Authors: Xu Ning , Luo Wei Qiang , Yang Hai Qing
Published: March 2013

The potential of near-infrared spectroscopy (NIRS) was investigated for its ability to rapidly discriminate the various brands of fermented Cordyceps mycelium powder. Relationship between mycelium powder varieties and the absorbance spectra was well established with the spectra region of 12500-4000 cm-1. Spectra preprocessing was performed using 1st derivative. Principal component analysis (PCA) was adopted for the clustering analysis and re-expressing of the hyper spectral data, and then, the obtained principal components (PCs) were used as the input of back-propagation artificial neural network (BPANN) to build PCA-BPANN model for the variety discrimination. The unknown samples in prediction set were precisely identified with the correlation coefficient R of 0.9959 and root-mean-square error of prediction (RMSEP) of 0.1007, which suggests that the NIR spectroscopy, if coupled with appropriate pattern recognition method, is very promising for rapid and nondestructive discrimination of fermented Cordyceps mycelium powder.
Study of the Effect of MoS2 and PTFE Based Coatings on Adhesive Wear of Stainless Steel
Authors: Thana Thanit , Tuchinda Karuna
Published: March 2013

this paper, the adhesive wear characterization of MoS2, PTFE and mixture of MoS2 and PTFE films coated on stainless steel substrate, i.e. SUS440C, have been studied. The films were deposited by dry spray techniquecommercially available domestically. The films properties which are surface hardness, film thickness, surface roughness and adhesion strength were investigated. The thickness and the surface hardness of the films were approx. 7, 6.8 and 6.2 µm and 0.1,0,8 and 0.4GPa for MoS2, PTFE and the mixture of MoS2 and PTFE, respectively.The surface roughness of MoS2, PTFEwerefound to be similar with the value of Ra of approx. 0.302-0.303 µm. The mixture of MoS2 and PTFE showed smoother surface with the surface roughness (Ra) of approx.0.260µm. The PTFE film has shown better adhesion strength with higher critical load for first failure and full delamination. However, the failure pattern observed suggested lower severity of surface damage.Theresults fromtribologicaltests between the coated SUS440C ball and the SUS304 discshowedstrong effect of the coating on adhesive wear behavior of the contacting systems.For MoS2coated surface, the coatingsurface peeled offgraduallyuntil the surface ofthe substrate was revealed. Whereas, the PTFEcoated surface had delaminated immediately once in contact resulting in plate liked wear debris.The mixture ofMoS2 andPTFE haslower thefriction coefficient compared to the individual coating. Thewearbehavior found on the mixture of MoS2 and PTFE coated surface had similar characteristic to those found on surfacecoatingwithMoS2. It also showed lower wear occurrences with better appearance due to tearing wearat the edges of the worn suggesting better load capacity of the mixed film than the individual PTFE coating.
Rare Earth Luminescent Materials in Landscape Lighting Application
Authors: Zhu Li , Chen Lei , Tan Wen Di
Published: March 2013

Rare earth luminescent material is in recent years focus on Cultivation of the advanced material industry, its luminescence properties in life applications are very extensive, but widely is used in industrial field and luminescent TV, lamp production direction, in landscape planning application field is very limited. Because not only is the rare earth luminescent material, and landscape areas are in recent years started to gain attention field, its research is still in the young state, interdisciplinary communication is not much also, this makes the rare earth luminescent material itself advantage there is still much room for improvement. In this paper, for the rare earth luminescent material characteristic research in the landscape of the expansion and sustainability. For the rare earth luminescent material and landscape design to provide more materials application may.
The Research of the High Speed Steels Produced by Powder and Casting Metallurgy from the View of Tool Cutting Life
Authors: Monkova Katarina , Monka Peter , Jakubéczyová Dagmar
Published: March 2013

High speed steels have a leading position in the group of tool materials today in regard to their special properties. The article deals with the cutting life of tools, which cutting tips were produced from high speed steels. The test were realized at Faculty of Manufacturing Technologies TU Kosice with the seat in Presov, in collaboration with Institute of Material Research of Slovak Academy of Sciences in Kosice. As the method for tool-life investigation was selected the simple radial lathe-turning test. The measured values were statistically processed and submitted to the remoteness testing according to Grubbs. The results of the experiments are graphically presented as a dependence of cutting life on the cutting speed for five types of high speed steels. The base material for four of them was high speed steel STN 19 830 produced via powder metallurgy. It was modified by additional alloying elements, so in this way originated next variations of this steel listed above. Measured data were compared with the fifth type of high speed steel with similar chemical composition, but this type was produced via classical approach - by casting metallurgy. The know-how of the investigated relation will enable to the producers to make a good decision about what type of tool material should be used at the machining in specific conditions in order to achieve good quality of machined surface while achieving the required level of energy consumption.
Effect of Coiling and Normalizing Annealing on the Microstructure of a Newly Developed Cold-Rolled Non-Oriented Electrical Steel
Authors: Zeng Yan Ping , Cui Hui Jie
Published: March 2013

In order to improve the magnetic properties, copper was added to cold-rolled non-oriented electrical steel with low carbon and low silicon. The grain sizes and precipitates in hot-rolled bands of the investigated steel were quantitatively studied. The results show that the recrystallization of deformed grains has been completed in the coiled bands and the recrystallized grains are fine due to low coiling temperature and pinning effect of precipitates. But grains grew up obviously after normalizing annealing at 850°C for 1h because the mobility of grain boundary is so good at elevated temperature that pinning effect of precipitates can’t prevent the migration of grain boundary. Thus, normalizing annealing is necessary to obtain large grains in hot-rolled band. In addition, the typical morphologies of precipitates in hot-rolled bands are square, rectangular, hexagonal and triangular and they are identified as AlN phase based on EDS and SEAD analysis, which can form by epitaxial growth mode. For the hot-rolled bands coiled at 550°C, the increase of average size and volume fraction of AlN particles with coiling time is mainly related to the growth of AlN particles, whereas for the hot-rolled bands coiled at 650°C, the decrease of average size and the increase of volume fraction of AlN particles with coiling time are chiefly attributed to the precipitation of many small AlN particles. The volume fraction of AlN particles increases with coiling temperature because they precipitate more quickly at 650°C than at 550°C.
Investigations of Oxy-Fuel Combustion Characteristics and Oxygen Permeation Process in a Stagnation Flow ITM Reactor
Authors: Nemitallah Medhat , Habib Mohamed A. , Ben-Mansour Rached
Published: March 2013

In this work, a modified two-step reaction kinetics model for methane-oxygen combustion is used to predict oxy-combustion characteristics and permeation rate characteristics inside a stagnation flow simple symmetric ITM reactor. New coefficients oxygen permeation equation model is introduced herein this work by fitting the experimental data available in the literature for a LSCF-1991 ion transport membrane. Using CH4 as fuel plus CO2 as sweep gas, the effects of reactivity is analyzed using the same sweep gases (CH4 plus CO2) is investigated here by comparing the same cases with and without considering reactions in the permeate side. Also the influences of the percentage of CH4 in the sweep gases mixture on the permeation and combustion processes are included in this work. It was found that the oxygen permeation flux increases with activating chemical reactions in the permeate side of the membrane and this is due to increased partial pressure driving force across the membrane surface as a result of disappearance of oxygen molecules in the permeate side because of combustion. Another reason for this is the increase in the membrane temperature which affects the activation energy of the membrane and so the permeation rate. More details about the models used and the oxy-fuel combustion characteristics in the permeate side of the membrane are included in the present study.
Guiding Solid Elastic Waves to Arbitrary Paths by Isotropic Materials
Authors: Xiang Chao Chun , Hu Jin
Published: March 2013

As a result of the flexibility provided by the transformation elastodynamics, the impedance-matched condition exists for both S and P waves in perpendicularly incident cases in isotropic materials, thus the isotropic elastic wave beam bender can be designed. In this paper, we explore some characteristics of this bender and show that by assembling the bender units a solid elastic beam can be guided to an arbitrary path, which will provide convenience in engineering practices. Examples are conceived and validated by numerical simulations.
Vibration Fault Diagnosis of Rotating Machinery Using PSO-Based Radial Basis Function Network
Authors: Sun Huo Ching , Huang Chao Ming , Huang Yann Chang , Chen Hsing Feng
Published: March 2013

A particle swarm optimization-based radial basis function network (PSO-RBFN) is presented to diagnose vibration faults of steam turbine-generator sets (STGS) in a power plant. The proposed PSO algorithm is used to automatically tune the control parameters of the RBFN. The test results demonstrate that the proposed PSO-RBFN has a higher diagnostic accuracy than the RBFN and multilayer perceptron network (MLPN) trained by error back-propagation algorithm. Moreover, this paper has demonstrated that the proposed PSO-RBFN can be as a reliable tool for vibration fault diagnosis of STGS.
The Optimization Design of High Precision Long-Range Cartesian Coordinate Robots’ Drive System
Authors: Han Xian Teng , Wang Yu , Tong He Ting
Published: March 2013

At present, Cartesian Coordinate Robot driving systems have several ways, such as timing-belt, screw, rack-pinion and chain. But, they are difficult to synchronously meet needs of high precision, long range and heavy load. In this paper, Trochoid Cam Gear (TCG) was used as main transmission mechanism to implement high precision and long range motion of the secondary girder of a Cartesian Coordinate Robot, and disposed reasonably the space positions of linear rails and servo motors to meet the needs of heavy load.
A Quantum Repeater Based on Entanglement Purification and Entanglement Swapping
Authors: Zhou Zhen Zhu , He Wei , Zhu Chun Dan , Wang Ying
Published: March 2013

We discuss a long-distance quantum communication system based on entangled photon pairs, which apply entanglement as its fundamental resource. For distances longer than the coherence length of a counterpart noisy quantum channel, the fidelity of transmission is ordinarily so low that standard purification processes are not applicable. The quantum repeater stretches the length of the entangled photon pairs. And the high fidelity entanglement of photons between sender and receiver is obtained by entanglement purification and entanglement swapping. We compare the nested repeater with the common repeater and show that it outperforms the latter, which is built an EPR pair in less time.
Dynamic Time History Analysis on Groundwater Hydraulic Tunnel under Three Dimensional Viscoelastic Boundary Conditions
Authors: Yao Ji , Cao Liang , Wang Hui Min , Zhang Li Jie , Wu Liang , Qian Shan Guang
Published: March 2013

The three dimensional finite element model of a groundwater hydraulic tunnel was eatablished in this paper by FEM software ANSYS, two seismic waves of bedrock wave and EI-centro wave in similar sites were entered, and dynamic time history method was applied to compare the seismic response of the two hydraulic tunnels which were under rigid boundary conditions and viscoelastic boundary conditions respectively. The results showed that, the dynamic response of the model under rigid boundary conditions was larger than the response under viscoelastic boundary, and the viscoelastic boundary was closer to the actual situation. Under viscoelastic boundary conditions, the smaller depth of the hydraulic tunnel, the more intensive of the seismic response.
Design and Implementation of Testing and Management System on Special Information Security Products
Authors: Xu Zue , Qu Hai Peng
Published: March 2013

In order to solve the problem that the security function testing on special information security products, a system, that is, Testing and Management system on special Information security Products, is designed and implemented. By ways of Hibernate framework and WebService, the conformance testing on the security function of the special information security products is accomplished. And the testing requirements on the special information security products are normalized and the testing methods of the special information security products are integrated. The testing reports which provide reference for Mandatory Certification on special information security products about the conformance of function can be produced.
The Design of Simultaneous Location and Mapping System for Intelligent Vehicle in Indoor Environment
Authors: Wang Lei , Lu Xiao Long , Cao Zhi Hua
Published: March 2013

A design of simultaneous location and mapping system for intelligent vehicles was proposed. The paper put forward a new algorithm digitalizing motion state which can achieve the automatic navigation and location of the vehicle. Convert the coordinate systems of distance-detecting module with ultrasonic sensors and odometer positioning module to the global coordinate system so as to determine the robot’s global coordinate position and the barrier’s distribution in the environment. The motion environment was represented as a 2-D grid map. The simulation in Visual Studio software can verify that the design is available to establish the simultaneous location and mapping of indoor environment and the algorithm is reliable. The innovation point is that simultaneous location and mapping is achieved by coordinate conversion in the algorithm instead of the complex computing.
Effect of Minor V Addition on Al88Y7Fe5 Amorphous Alloys
Authors: Yang H.W. , Tan M.J. , Li R.D. , Wang J.Q.
Published: March 2013

The effect of the addition of 0.2-0.65 at% of V on the glass forming ability and mechanical properties of Al88Y7Fe5 alloy were investigated. The addition of V in this range had little effect on the glass forming ability of the alloy, but lowered the tensile strength of the amorphous ribbon. The fracture surface of Al88Y7Fe5 amorphous ribbons was typical vein pattern for ductile metallic glasses, however, that of the alloy with 0.5% V addition changed to two different regions, i.e., vein pattern region and smooth region. At high magnification, the smooth region was composed of nanometer sized corrugations, which is typical for brittle metallic glasses.
Sub-Pixel Image Features Location Technology
Authors: Han Guang Lin , Xia Li Ping
Published: March 2013

Based on image features high precision positioning measurement research. Design of a Harris corner sub-pixel location algorithm, and makes the simulation experiment. Algorithm in image noise can be realized under the condition of larger than 0.1 pixels high precision positioning.
A Bayesian Approach to Phoneme Detection for Uyghur
Authors: Shasike Muhetaer , Wasili Buheliqiguli , Li Xiao
Published: March 2013

In this paper, we presented a semantic speech segmentation approach, in particular phoneme segmentation. In order to get phoneme level information, a novel voiced speech, unvoiced speech and silence (VUS) classification is proposed. Five parameters that can be extracted by short-time analysis methods are used to discriminate the phoneme boundary. Experiments on Uyghur broadcasting news indicate that the performance of proposed algorithm is satisfying.
A Fast Power Tower Extraction Based on an Improved Algorithm for Harris Corner Detection
Authors: Ting Fang , Zhao Yun Biao , Hu Xing Liu , Bing Xia
Published: March 2013

Comprehensive analysis of the tower in the image feature information with Harris corner imprecise for complex image, we propose an improved algorithm, which use of the improved Harris detection method to calculate the number of gray similar to the target pixel 8 field, analyze the gray level distribution of pixels within the local range, and then use the lag suppression method to set threshold , if corner is the objective function greater than the set threshold, the change point was identified as the final corner. The experimental results proved to be effective to determine the image of the tower area.
Simulation and Experiment of PVDF Temperature Sensor
Authors: Jia Yun Fang , Ni Qing Shan , Chen Xin Juan , Ju Cheng , Xing Ke Li , Jin Tian Hong
Published: March 2013

Pyroelectric sensors based on PVDF polymers have great potentialities in the practical areas because of their great merits in the high converting efficiency from caloric or kinetic energy to the electric signal, as well as light-weight and flexibility. This work emphasized on the simulation of the PVDF pyroelectric sensor on the circuit level. The presented equivalent circuit model was simulated with the combination of the whole testing circuit in the environment of Multisim, so the simulated data could be comparable with the measured ones. And the validity of this PVDF sensor’s Multisim model was testified by the comparison with experimental data. Moreover, thermoelectric energy conversion was discussed by the extracted parameters in the equivalent circuit.
A Simulation Platform for Dynamic Positioning Ship with Guidance, Navigation and Control Function
Authors: Sun Xing Yan , Fu Ming Yu , Shi Xiao Cheng , Wei Yu Shi
Published: March 2013

In order to study the whole system performance of dynamic positioning ship, a simulation platform which contains environment and ship model, as well as basic guidance, navigation and control functions is established. Besides the ordinary ship and environment modeling, a guidance method for waypoint following is designed by using path interpolation and circle of acceptance. A sensor-fusion based federated filter is proposed to deal with the problem of state estimation and wave filtering. To make the whole system becomes a closed loop feedback system, a PID method are applied to deal with the control problem. By using this simulation platform, this paper simulates and studies the basic functions of a typical dynamic positioning ship. Finally, the simulation proves the validity and excellent performance of this dynamic position ship simulation platform.
Intelligent Control Network Design for Audio Equipment
Authors: Zhang Xiu Li , Zhang Qiao Wen
Published: March 2013

In order to solve the problem of inconvenience in network construction, short transmission distance of RS232 and non-intelligence audio device with different interface for network, this paper presented a design of audio intelligent control network based on CAN-Bus. The topology of audio control network, structured models of ICANNet and hardware are firstly discussed. Then the protocol of transport layer and application layer and software of intelligent control network is studied. Finally the test results were given to demonstrate the feasibility and reliability of the design.
Distribution Network Reconfiguration Using an Approximate Optimization Approach
Authors: Rong Hai Na , Qin Yan Hui
Published: March 2013

Power network reconfiguration is an important process in the improvement of operating conditions of a power system and in planning studies, service restoration and distribution automation when remote-controlled switches are employed. This paper presents the use of a quantum-inspired evolutionary algorithm to solve the distribution network reconfiguration problem. The quantum- inspired evolutionary algorithm is the combination product of quantum computing and evolutionary computation and is suitable for a class of integer programming problems such as the distribution network reconfiguration problem. After the analysis and formulation of the distribution network reconfiguration problem, the effectiveness and feasibility of the introduced method is verified by a large number of experiments.
Wireless Control System for Plug Seedlings Environment Based on GPRS
Authors: Wang Ji Zhang , Li Ping Ping , Peng Yu Li
Published: March 2013

In order to realize remote monitoring and control for the environment of plug seeding, the environment control system based on GPRS was developed. The systems includes environment sensors, GPRS remote terminal unit (RTU), control unit and WEB server. Through the GPRS network to transmission the environment parameters, and upload data via the Internet to the web server. According the environment parameters, the server get the optimal control scheme based on model. Then transmit the control scheme to the remote terminal unit (RTU) through the GPRS network. The RTU get the control scheme, the control unit send the control signal to the control equipment. This system can achieve real-time control of environment parameters for plug seedling.
Wind Farm Active Load Allocation Scheme Considering Wind Speed Fluctuations
Authors: Qiu Jian Ming , Xu Yi Xin , Lu Jin Jin , Liu Ji Zhen , Bai Yan
Published: March 2013

According to the structure and information flow of the active control system of large-scale wind farm, a load allocation scheme is proposed considering the wind speed fluctuations within the cluster, i.e. deciding the de-load depth of each turbine according to wind speed fluctuation when the farm is running under AGC mode, using wind turbine generator (WTG) de-load ability to reduce the impacts of wind speed fluctuations on the entire wind farm output. Use particle swarm optimization, prediction of WTG generation, wind speed fluctuation condition, wind scheduling instruction information to calculate the WTG de-load depth risk factors, and get the de-load power order distribution scheme. A simulation of 10 2MW WTGs shows that, load allocation scheme considering the wind speed fluctuations can reflect the relationship effectively between wind speed condition and output reliability, and promote the stability of wind farm output.
A Brief Review on Models of Animal Tracking in Video
Authors: Shi Xing Min
Published: March 2013

The observation on motion and behaviors of the animal is still important in scientific research fields, and various behaviors of animals are tracked and analyzed for many different purposes. The paper concentrates on the technologies employed for animal tracking in video, and reviews the tracking models related to animal motions and behaviors including shape-based model, contour-based model, articulated model, Bag-Of-Feature based model, Markov Model, etc. and gives a brief summary of these models respectively.
An Architecture for Home Service Retrieval Based on Function Concept Ontology
Authors: Wei Mo Ji , Zhao Yan Qing , Wang Lei , Wang Yan
Published: March 2013

This paper constructs function concept ontology for smart home to automate home service retrieval according to the functional properties. Firstly in order to construct function concept ontology, the function concept is divided into five categories by analyzing the lifecycle of information, and then each category is refined according to the ways the devices adopted. Then a scenario of audible alarm of gas detective is given to show the drawback of current retrieval mode. Finally an ontology-based architecture is proposed to present service registry, retrieval and invocation based on the function concept ontology.
The Application of Fuzzy Comprehensive Evaluation Model in the Teaching Evaluation System
Authors: Sun Shu Wen , Zhai Yu Wen
Published: March 2013

According to the subjectivity, randomness and fatigue of the satisfaction selection of online teaching evaluation indicators for the students, the level of teachers teaching can not truly measure by the evaluation results. This paper introduces the fuzzy comprehensive evaluation method to deal with the evaluation data, and Practice has proved that this method produced results more equitable to reflect on teaching level. Which help teachers to promptly improve and improve teaching, the variable quality of teaching time control for process control, change the static management for dynamic management.
A Constrained Particle Swarm Optimization Algorithm with Oracle Penalty Method
Authors: Dong Ming Gang , Cheng Xiao Hui , Niu Qin Zhou
Published: March 2013

To solve constrained optimization problems, an Oracle penalty method-based comprehensive learning particle swarm optimization (OBCLPSO) algorithm was proposed. First, original Oracle penalty was modified. Secondly, the modified Oracle penalty method was combine with comprehensive learning particle swarm optimization algorithm. Finally, experimental results and comparisons were given to demonstrate the optimization performances of OBCLPSO. The results show that the proposed algorithm is a very competitive approach for constrained optimization problems.
Mean Square Exponential Stability of Stochastic High-Order Hopfield Neural Networks with Time-Varying Delays
Authors: Shi Xiang Dong
Published: March 2013

The paper considers the problems of global exponential stability for stochastic delayed high-order Hopfield neural networks with time-varying delays. By employing the linear matrix inequality(LMI) and the Lyapunov functional methods, we present some new criteria ensuring globally mean square exponential stability. The results impose constraint conditions on the network parameters of neural system independent. The results are applicable to all continuous non-monotonic neuron activation functions.
Study on Packaging Thermal Stress of Micromechanical Silicon Resonant Accelerometer
Authors: Huang Li Bin , Gao Yang , Li Qing Yun , Wang Dong Rui
Published: March 2013

Packaging thermal stress is harmful to the performance of the micromechanical silicon resonant accelerometer. In order to decrease the packaging thermal stress, correlations of packaging thermal stress with the material properties, curing temperature and geometrical size of adhesive layers of adhesive materials were discussed. A finite element model of package was developed to analyze the influence of surface mounting technology (SMT） on the micromechanical silicon resonant accelerometer. The simulation results show that the Young’s modulus, thermal expansion coefficient, curing temperature and geometrical sizes of adhesive layers are important influencing factors for packaging thermal stress and the warpage of the chip. The thermal stresses during the process of SMT will cause the resonant frequency shift.
Design and Simulation Experiment Study on Reconfigurable Spacecraft Base on Flux Pinned Interface
Authors: Lu Yong , Gao Feng Kuan , Gao Dong , Zhang Ming Liang
Published: March 2013

Magnetic flux pinning takes place between the high-temperature superconductors and magnets which can form non-contacting linkages between the individual components. This interaction is proposed for use in in-orbit assembly. This paper develops a flux pinned revolute joint which fits for the reconfiguration of modular spacecraft and details the reconfiguration mechanisms of the novel joint. Moreover, the process of reconfiguration is simulated via the rigid body dynamics. Furthermore, two flux pinned modules are constucted to confirm the feasibility of the designed flux pinned rovolute joint for reconfiguration on a testbed.
Design of the 40GHz UWB Transmitter for Wireless Intra/inter Chip Communication
Authors: Wang Ting Lan , Yang Shu Hui , Feng Di , Wang Bin , Su Zhen Wei , Chen Ying Chao
Published: March 2013

In this paper, a Gaussian Pulse Generator for use in CMOS UWB transmitters and use in the wireless inter or intra chip communication. The proposed architecture is composed of a simple and robust design of a Gaussian Monocycle impulse generator at the transmitter, a wideband short-range on-chip transformer for data transmission. The circuit was implemented and simulated in ADS2009 using 0.25μm CMOS technology with a supply voltage of 3.3V. Ultra-short GMP signals of 25ps duration and 40GHz center frequency.
Research and Implement about Embedded Database System Base-on NAND Flash Memory
Authors: Jiang Guo Song
Published: March 2013

Currently, the embedded database technology has become a very active research field, and attracted more and more attention. This paper research how to improve the storage performance of embedded database indexing mechanism using read and write characteristics of NAND flash memory. Based on the reviewed and compared of existing design of NAND flash memory, this article expressed the design and implementation of dynamic index mechanism base on B + Tree. The prototype system combines the advantages of operation of the adapted read operation disk model and write adapted write operation log model, optimal matching and converting for storage model of each node in B + tree model while running which make a variety of devices have better read and write performance.
A New Public Key Cryptographic Scheme
Authors: Yuan Feng , Ou Hai Wen , Xu Sheng Wei
Published: March 2013

The multivariate public key cryptosystem is a new and fast public key cryptosystem. This paper presents a multivariate public key cryptographic scheme over a finite field with odd prime characteristic. The idea of embedding and layering is manifested in its construction. The security of the scheme is analyzed in detail. The result indicates that the proposed scheme can resist all known attacks effectively.
Coexistence Studies between Mobile Communication Systems and Broadcasting Systems
Authors: Xiao Zheng Rong , Zhang Li Yun , Liao Jun , Yan Bin Feng
Published: March 2013

With the rapid development of mobile internet, more and more frequency band will be needed to meet the requirement of high data speed. The system coexistence between mobile system and broadcast system is studied, including the scenarios, models, simulation results, related analysis, and finally the solution to resolve the coexistence is given. In urban, an additional 37dB isolation between broadcast system and mobile base station should been satisfied. And an additional 15.7dB is needed between mobile base station and broadcast receiver.
A New Hash-Based Authentication Protocol for RFID Using Varying Identifiers
Authors: Li Shu , Yang Xi , Liang Ping Yuan
Published: March 2013

This article proposed a new security protocol with satisfying the lightweight requirements of the security of RFID system. Using varying identifiers, the protocol can resist Forward attack, Traffic analysis and Tracking attack, Replay attack. The Back-end Server holds the new identifier and last identifier for every Tag can keep database synchronization. Each Tag store a unique Key that is the secret information which also store in the Back-end Server. Use the Key, the protocol can implement mutual authentication between Back-end Server and Tag. Then the paper compared the proposed protocol with the typical protocols in security, effective and cost. The results demonstrate that the protocol can effectively solve the security problem of RFID systems.
Lifetime of WSN Research Based on Energy Balance
Authors: Yong Qi Dong , Chen Yang , Ye Xi Wen
Published: March 2013

the cause of the routing void of the WSN is analyzed,then the energy consumption model is established to analyze the optimal number of hops and a new routing protocol model based on energy balance is established. through simulation of the networks, it can be seen that the improved routing protocol can extend the lifetime of WSN.
Analyzing the Characteristic of JAVA Objects
Authors: Li Jun Yi , Chen Jing Yu , Fong Anthony S.
Published: March 2013

Java is a very popular Object-oriented programming (OOP) language because of its platform independent and automatic memory release mechanism (or garbage collection). However, garbage collection also speeds CPU time and should be done after careful consideration. In the paper, memory usage behavior and run-time object characteristics, including heap and object size, object age and access frequency, are studied using several commercial benchmarks. The profiler design method and experiment detail are represented in the paper. The runtime object characteristics are very important to guide the employment of different memory management algorithm.
Research on E-Government System Based on Multi-Source Information Fusion
Authors: Wang Ying , Sun Jie Li , Lin Tian Hua
Published: March 2013

E-Government system based on Multi Source Information Fusion has become a focus of attention. This paper studies the construction method and relevant technology of E-Government system based on Multi Source Information Fusion. A more effective E-government system based on Multi Source Information Fusion can achieve the E-government information resource sharing, and promote intelligent, individualized, one-stop E-Government information service.
Research and Development of 10kV Network Live Working Simulation Training System Based on Virtual Reality Technology
Authors: Liu Sui Sheng , Hao Luo , Zhang Xue Feng , Jia Jing Shan
Published: March 2013

Power system live working is an important part of power production safety, power system staff training has always been the majority attention of power industry researchers. The 10kV distribution network with high reliability and high security of distribution live working personnel raised taller requirement. In this paper the research and development of 10kV distribution of charged live working simulation training system based on virtual reality technology, it can solve some traditional physical training restrictions, in climate, site, equipment and so on, and has been applied in a number of areas.
Research on MAC Protocol for UWA Sensor Network
Authors: Zhu Wen Zhong
Published: March 2013

The characteristics and environment of the underwater acoustic (UWA) sensor network require a MAC protocol to be suitable for the long propagation delay. So we put forward a suitable MAC protocol, referring to the AGENT protocol in this paper. We call this protocol C-AGENT-LPD, which means C-AGENT with Long Propagation Delay. And it makes full use of the spatial multiplexing of the UWA channel. Through the simulations, we can see that the protocol has better time delay and throughput performance than the other two MAC protocols.
Application and Research of a Middleware in Call Center System
Authors: Qi Chang Xing , Hou Yi , Li Hai Yang
Published: March 2013

In order to solve the problems of communication and handling datas between IVR system and business system in call center, the middleware is designed. This paper analysises the structure of call center , executing process of the middleware and the function of seat system, IVR and middleware firstly. Then the structure, work flow, key technology of the middleware are descripted in detail, moreover the program of it is designed. Finally, the value and shortcomings of the system are analysised, Practice has proved, this middleware can satisfy the requirements of IVR and seating system data processing.
Mineral Processing Technology Study on a Lean Hematite Ore with Finely-Disseminated Minerals
Authors: Wang Wei Zhi , Zhou Li Hui , Yang Chun Guang
Published: March 2013

The mineral processing experimental research was carried out on the hematite bearing characteristics of low grade, fine grain,complex composition. The results showed that using the technological flowsheet of “stage grinding- low intensity magnetic separation”, the iron concentrate with recovery of 36.56% and grade of 65.85% Fe can be obtained. And the iron concentrate with recovery of 17.23% and grade of 63.53% Fe can be obtained by “stage grinding-HIMS process-reverse flotation” process. The final iron concentrate with TFe grade of 65.10%,yield of 19.19% and total iron recovery of 53.79% from the raw ores with TFe grade of 23.41％ was obtained, with the first stage grinding size being 55% -0.074mm and the second stage,93% -0.074mm.
Study on Corrosion Behavior of Hot Dip Coatings in Wet-Dry Cyclic Conditions
Authors: Xie Bin , Xing Shao Hua , Chen Ji Da , Yan Yong Gui , Li Yan
Published: March 2013

The corrosion of fasteners in ballast tank is much serious, due to the wet-dry corrosive conditions. Now most fasteners are protected by zinc-aluminium coating. In order to evaluate the anticorrosion performance of hot dip Galvanized (GI), Galfan (GF) and Galvalume (GL) coated fasteners in wet-dry cyclic conditions, the corrosion behavior of these coatings in 1h wet and 7h drying condition were investigated by electrochemical impedance spectroscopy technology. The corrosion rate of GI coating in drying condition is much faster than that in wet condition before 23rd cycle, after that time the corrosion rate in sea water is faster than that in drying condition, however the corrosion rate of GF coatings in drying condition is much slower than that in wet condition, and for GL coating, the polarization resistance is both than 104Ω•cm2, whether it is immersed in seawater or in drying condition, which suggests it has better anticorrosion performance. The corrosion rate of the GI, GF and GL coating is 30µm per year, 1.5µm per year and 1.3µm per year respectively and corrosion resistance of GL and GF is therefore twenty two and twenty times as that of GI.
A Threshold-Based K-Means Algorithm for Selfish Behavior Detection in IEEE 802.15.4 Wireless Sensor Networks
Authors: Chen Bo , Mao Jian Lin , Guo Ning , Qiao Guan Hua , Dai Ning
Published: March 2013

To overcome the insufficient of Sliding Window Non-parameter Cumulation Sum (SWN-CUSUM) algorithm, a Threshold-based K-means (TK-means) algorithm was presented to detect the selfish behaviors in an IEEE 802.15.4 Wireless Sensor Network (WSN).By judging the threshold and tracing the statistics characteristic of the average delay and the average throughput from each link, a node can determine if there is a selfish behavior and distinguish selfish nodes from normal nodes in the WSN. In the TK-means detection mechanism, when the threshold is lower than zero, it is judged that selfish behavior happens in network; In the presence of selfish behaviors, the data set is divided into K groups composed by a number of similar object, which have high similarity in the same groups and low similarity in different groups to distinguish normal nodes and selfish nodes. Simulation results from NS2 show that the TK-means algorithm can effectively detect the selfish behaviors generated by one selfish node or multiple selfish nodes in the WSN.
Determination of Textural Depth for Stone Matrix Asphalt
Authors: Hussain Arshad , Qiu Yan Jun , Ai Chang Fa
Published: March 2013

Stone Matrix Asphalt (SMA) is regularly and successfully used for surface courses in many countries. In this study SMA was designed using two different local aggregates blending ratios. The aggregate blends were tested for density, abrasion, crushing, water absorption and polishing before used in SMA design. Laboratory testing of the SMA surface mixtures was performed to determine volumetric and mixture specific characteristics. The results and analysis determined that SMA is a good surface meeting the design demands. All mixtures were tested for textural depth and skid resistance performance. It was concluded from this study that different aggregate blending can significantly alter the SMA mixture properties. The limestone and basalt blends can be successfully used to design an anti-slide SMA surface course.
Effect of Surface Elasticity on Scattering of Plane P-Waves by an Elastic Half-Plane with a Semi-Cylindrical Cavity
Authors: Wu H. M , Ou Z. Y.
Published: March 2013

When the characteristic sizes of materials and elements reduce to nanometers, the inﬂuence of surface energy becomes prominent in its mechanical behavior. In the frame of surface elasticity, the scattering of of plane compressional waves (P-waves) by a semi-cylindrical cavity embedded in an elastic half-plane is investigated in this paper. By using the wave function expansion method, we obtain the analytical solutions of elastci fields. The results show that surface energy has a signiﬁcant effect on the diffractions of P-waves as the radius of the semi-cylindrical cavity shrinks to nanoscale. For incident waves with different frequencies, radius of semi-cylindrical cavity, the effects of surface elasticity on the dynamic stress concentration around the semi-cylindrical cavity are discussed in detail.
Research the Influence of Curved Shape on the Multilayer Bellows
Authors: Si Dong Hong , Liu Yong Gang , Ma Wei
Published: March 2013

As a cylindrical thin-walled container, multilayer bellows has greater bit shift compensation, vibration and noise reduction capabilities while the appropriate metal and viscoelastic damping materials are adopted. Finite element models are adopted to analyze the loss factor of multilayer bellows in ANSYS. The strain energy distribution of Multilayer bellows and viscoelsticity layer are given. According to the strain energy, the influence of structural parameters on the loss factor is studied. The results show that the loss factor can be improved by employing the curved shape with big wave height, small wall thickness, small wave pitch and diameter of bellows.
On-Line Monitoring System for Transformer Partial Discharge
Authors: Liu Guang Ya , Kang Lu , Peng Wei Na
Published: March 2013

On-line insulation monitoring of transformer and the fault diagnosis are effective means to avoid sudden accidents happening on the transformer, which are necessary to perform the condition based maintenance (CBM) of transformer. Partial discharge is often accompanied by the external signals of sound, light and electricity as well as some detectable physical phenomena such as characteristic gas and dielectric loss. The partial discharge defects inside the transformer can be found by detecting the external signals. The principle of electro-acoustic monitoring, its monitoring systems and the related judgment technologies are expounded, on the basis of which an outline design of the monitoring system is presented.
Portable Acoustic-Electric Combined System for Partial Discharge Detection in GIS
Authors: Liu Bin , Hu Yue , Chen Qian , Zhang Wei Dong , Cao Ling Yu , Lu Xian Feng
Published: March 2013

A portable acoustic-electric detection system for GIS partial discharge is developed. This system integrates both high and low-speed data acquisition devices, and is capable of multichannel joint detection of ultra-high-frequency and high-frequency current as well as ultrasonic signal generated during the GIS partial discharge process. The software of this system is developed based on LabVIEW. It can successively capture, acquire and store the pulse waveform of partial discharge, calculate the phase of discharge pulse and realize time-frequency analysis and amplitude-phase distribution analysis of PD signals at the same time. By calculating the time difference of multi-channel ultra-high-frequency (UHF) signals and of PD ultrasonic signals or the time difference between the two, the system is able to locate the PD source. This system has been applied to on-site partial discharge detection of 220kV and 500kV GIS substations, and the test results have verified the performance of the system.
Measurement the Content of N-Butyl Pyridine Nitrate in Water by UV-Spectrum
Authors: Tian Peng , Huang Tao , Qin Tian Ling , Meng Bo , Song Yang Yang , Du Wen Le
Published: March 2013

N-butyl Pyridine Nitrate ionic liquid is prepared by the double decomposition reaction of BPC and NaNO3. The ionic liquid at room temperature used in the experiment has a significant absorption determined by UV spectrum within the range of 200-400nm, the maximum absorption wavelength of BP-NO3ionic liquid is 256nm. The standard working curve of BP-NO3ionic liquid is y= 0.06848x + 0.04427(R=0.99913). The recovery rate of BP-NO3ionic liquid which is between 100.2% and 102.4%, is measured by standard addition method in water.
A Systematical Study on the Accuracy of Air-Borne InSAR System in DGPS/IMU
Authors: Liu Si Wei , Mu De Jun , Liu Jian Ge , Lou Liang Sheng
Published: March 2013

With respect to the principle of Digital Elevation Modeling (DEM), through analyzing on the overall measurement accuracy of an InSAR in DGPS/IMU, the authors have mathematically inferred that the dominant factors for system accuracy are: Baseline Length, Baseline Inclination Angle, Radar Side-looking Angle, Phase Difference, the distance from radar antenna to various ground target points, Positioning Coordinate and Velocity of the flying platform, Center Doppler Estimation and such on, put forth a set of delicate formula for the factors on system measurement accuracy and error, verified the aforementioned outcomes by a variety of digital simulations, and thus established the principle in system design for air-borne InSAR system. Therefore, this paper is consequential for surveying and mapping both in theory and engineering.