bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance of RC Deep Beams with Different Combinations of Web Reinforcement
Authors: Leon Raj J. , Appa Rao G.
Published: July 2013

The behaviour of reinforced concrete deep beams is complex due to small shear span-to-depth ratios, which deviates its behaviour from the classical Bernoullis beam behaviour. Such behaviour is predominant in cases where members are supported over small spans carrying heavy concentrated or distributed loads. Such is the case in the structural members like pile cap, transfer girder, panel beam, strap beam in foundation, walls of rectangular water tank, shear wall etc. This paper reports on the influence of Poly propylene fibers combined with and without steel fibers on the stiffness, spall resistance and shear strength of RC deep beams. A total of 21 beams were tested to failure under two-point loading, which were compared with the ACI code provisions. The shear span-to-depth ratios adopted were 0.7 to 0.9 incorporating three steel fiber volume fractions of 0%, 1%, 1.25% along with two different fibers of Steel and Poly propylene with volume fractions of (1.0 + 0.0) %, and (1.0 + 1.0) %. The beams with shear span-to-depth ratios 0.7, 0.8 and 0.9 showed an increase of 21.9%, 23.43% and 23.9% in the ultimate load carrying capacity with combined steel and poly propylene fibers as replacement of web reinforcement with reference to that of the beam without web reinforcement. With the above combinations, the shear strength and stiffness of the beams have been found to be improved. When the horizontal shear reinforcement was increased, the shear strength was found to increase.
Bridge Deflection Sensor Fault Diagnosis Base on ICA
Authors: Hu Shun Ren , Li Rui Ping , She Li
Published: July 2013

Fault diagnosis accuracy is not high for traditional multivariate statistical methods ,in this paper , the deflection sensor fault diagnosis method based on independent component analysis was proposed .This method not only removed the relationship between process variables , but also make full use of higher order statistical properties of process variables ,establish the independent element model of the process information, finally ,simulation the multivariate process model in the system ，the simulation result shows that this method can quickly and accurately detect the abnomal occurred in the system ,verify the validity of this method and advantage compared with taditional PCA method.
Design of the DSP Controller for the Magnetic-Control Soft-Starter
Authors: Chen Jing , Zhou Bin , Yuan You Xin , Zhu Huai Bin
Published: July 2013

This objective of this work is to design and implement the magnetic-control soft-start controller for the motor starting at rated current. The motor is accelerated smoothly, the starting current is reduced and motor starting performance is improved by this soft-starting technology. For eliminating the harmfulness of the starting current of the three-phase AC motor, the DSP controller is used as the controller in this magnetic-control soft-starter. The design of the DSP controller for the magnetic-control soft-starter is first proposed. The hardware and software designs are realized in this paper, and it is subsequently verified experimentally. Experimental results show that the DSP controller for the magnetic-control soft-starter has extensive applicability, high reliability and high performance price ratio.
Cascaded Multilevel Inverter IM Speed-Sensorless Vector Control System Based on MRAS Theory
Authors: Lin Zhen Jun , Huang Sheng Hua
Published: July 2013

Cascaded multilevel inverters could realize high-voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic could achieve high-quality output voltage waveforms and input current waveforms. These merits are made for motor control, especially in the field of speed-sensorless vector control of induction motor based on the theory of MRAS. This paper constructs a simulation system with the help of MATLB/SIMULINK and a system combined cascaded H-bridge multilevel inverter with induction motor with the help of DSP and FPGA. The simulation and experiment results verified the superiority of cascaded multilevel inverter applied on the MRAS speed-sensorless vector control of induction motor.
The Coordination Control Technology of DFIG-SMES Based on Hamilton Function
Authors: Huang Wen Tao , Deng Chang Hong , Shu Zheng Yu , Weng Yi Xuan
Published: July 2013

The traditional control technology of doubly fed wind power generator is based on stator flux-oriented control technology but not considering the volatility of wind speed, the non-linear and the robust control of wind generator. This article gives a coordination control technology of DFIG-SMES (Superconducting Magnetic Energy Storage) based on Hamilton function. It derives the stability region of controller parameters and proves the stability condition. It designs and builds control test system of DFIG-SMES controller based on MSP430 chip. It achieves good results through experiments under random wind. The study establishes the foundation for the hardware platform of nonlinear and robust control system of DFIG.
Chaos Identification and Suppression in an Indirect Field-Oriented Control of Induction Motor Drive Based on 0-1 Method
Authors: Wang Dong Dong , Lu Yi Min , Huang Xian Feng
Published: July 2013

A period-doubling bifurcation may occur when the estimation error of the rotor time constant exists in an indirect field-oriented control (IFOC) of induction motor drives. Then chaos oscillations appear under some parameter values which are usually tested by the Largest Lyapunov exponents. In this paper, we apply the modified 0-1 method to detect chaos phenomenon instead, and design a controller to suppress chaos in the IFOC system. Simulation results indicate that the proper parameter region of the controller can be obtained with this method, and with the adaptive controller the system can quit from the chaotic state into the stable state effectively and robustly. The 0-1 method identifies chaotic behaviors directly through the time series without constructing phase space. Therefore, the proposed method is not affected by the complexity of the system and is not sensitive to noises.
Vector Control of Brushless Doubly-Fed Machine for High Power Stand-Alone Power Generation
Authors: Ji Kai , Gao Yue , Zhu Jun , Huang Sheng Hua
Published: July 2013

In this paper, a novel variable speed constant frequency brushless doubly-fed induction generator system using back-to-back multilevel converters for high power stand-alone power generation is described. According to control target, the unified reference-frame model is used to develop an improved forced power stator flux oriented vector control strategy. The similarities and differences between the grid-connected and stand-alone topology and control strategy are also specialty analyzed and compared. Simulation results prove the feasibility and validity of the proposed model, theoretical analysis and excellent performance of the proposed control scheme.
Research of Blurred Face Image Detection Based on DCT and Edge Detection Algorithm
Authors: Meng Peng Fei , Wang Wen Dong , Wang Kong Qiao
Published: July 2013

Multimedia has been widely used on the mobile platform. Due to its mobility and instability,the mobile terminal inevitably produces some blurred pictures (especially when shooting human faces). Hence, if these blurred and normal images are well classified and separated, it will be significant to improve the browsing efficiency. This paper focuses onresearch of two popular blur detection algorithms, DCT (Discrete Cosine Transform) and edge detection algorithm. It also offers the implementation of the blurred face image detection and classification system based on these two algorithms. At last it contrasts these two algorithms and draws a conclusion.
Number Modeling of Forming Behavior for Al-Based Coating on Magnesium Alloy Fabricated by Supersonic Particles Deposition
Authors: Wang Xiao Ming , Zhu Sheng , Chang Qing , Feng Xue Qiang , Liu Yu Xiang
Published: July 2013

The forming behavior of Al-Si coating on magnesium alloy fabricated by supersonic particles deposition was investigated by numerical stimulation. The results indicated that the later deposited particles generated horizontal spread effect at interface and interlocked mechanically with metal jet produced by the former deposited particles, which promoted the formation of mechanical bonding of Al-Si coating. Temperature of deposited particles at bottom of Al-Si coating was higher obviously than that on the top layer, the maximum value was about 498°C at the collision contacting points among deposited particles at bottom of the coating, which would promote metallic bonding and physical bonding, proved that magnesium alloy and Al-Si particles were matched pair suited for supersonic particles deposition.
Coordination Algorithm Design of the Load Sharing Proxy Servers for Streaming Media
Authors: Zhi Xi Hu , Zhi Ai Di
Published: July 2013

With the rapid development of streaming media applications, clustered streaming media proxy servers have become the mainstream of high-end streaming media proxy. To increase the IO throughput capacity of streaming media proxy servers, the most effective method is middle-ware technology in which several servers are bridged together to form a proxy cache server cluster, and the key is the coordination of individual proxy servers. The decision problem of the user request dispatch actually belongs to NP-complete. This article proposes an online coordination algorithm for the load sharing streaming media proxy servers, and discusses the relative deviation of the online algorithm from the optimal solution, to serve as a reference to the specific applications of clustered streaming media proxy servers.
An Intelligent Approach for Reactive Power Planning in Distribution Network with Wind Power
Authors: Wang Ling Yun , Pan Jie , Lu Ling
Published: July 2013

An intelligent approach for reactive power planning in distribution network with wind power is presented. A genetic optimization algorithm is applied in order to optimize the reactive power dispatch. The reactive power requirement for wind farm is considered as a restriction so that the active power control objective can be achieved while the real power losses are minimized. Finally, the proposed method is tested in the standard IEEE 30 node system with five wind turbines as a simulated wind farm, while considering the capability limits of wind turbine. The numerical results show that the proposed intelligent genetic algorithm can reduce real power losses effectively and improve the node voltage stability.
Application of Workflow Technology in the CAPP System
Authors: Meng Li Li , Lu Chun Guang , Zhao Hui Zhen
Published: July 2013

The traditional CAPP system pays much attention to the intelligent generation of the parts process route or pursuit integration of CAD and CAPP and CAM, but it has exposed many shortcomings in the process management of process design and approval. In order to solve the problem of information transmission and process reengineering, this paper discusses the application of work flow technology in the CAPP system, and analyzes the process design and approval process based on Petri Nets model, and finally explains database design and realization of process workflow and the control mechanism of workflow engine based on state transition on emphases. Through the practical application, the system can greatly improve the efficiency of design and management of process, the process design is more flexible and more standardization.
Optimal Common Due-Window Assignment with Linear Deteriorating and Resource-Dependent Processing Times under a Deteriorating Maintenance Activitiy
Authors: Luo Cheng Xin
Published: July 2013

This paper studies single-machine scheduling problems with a due-window assignment under a deteriorating maintenance and time-and-resource-dependent processing times. Jobs completed within the due-window incur no penalties, other jobs incur either earliness or tardiness penalties. The maintenance activity can be scheduled immediately after any of the completed jobs. We assume that once the maintenance activity has been completed, the machine efficiency will be improved and the machine maintenance duration depends on its starting time. The objective is to find the maintenance position, the size and location of the due-window, and the sequence of jobs and resource allocation scheme to minimize a cost function based on the window size and location and the earliness and tardiness of jobs and resource. We propose an algorithm to solve the problem.
A New Method to Solving the Internal Mass of Rigid Body Based on the Principle of Inertia Parameters
Authors: Sun Ning , Li Huan Yu , Gong Jing Jing
Published: July 2013

On the basis of Coordinate transformation analysis of the inertia parameters in three-dimensional space, according to the characteristic that the coordinate direction is existed and unique which the product of inertia is 0 when rotating the coordinate system, a new method to judge and calculate the particle information by searching for the intersection of the two lines that lead from two different coordinate origin is proposed. The processes and procedures to calculate the internal mass of rigid body are deduced theoretically. A special numerical example is given to verify the correctness of the theory. The error factors are analyzed qualitatively as well.
Study on Virtual Material Method for Dynamic Features Analysis of Crank Connecting Rod Mechanism
Authors: Li Shen , Bai Yun Guang , Liu Jian Xiao , Zhao Shu Sen , Yuan Hui Qun
Published: July 2013

A method is put forward that is to use anisotropic virtual material to simulate the characteristic of combined parts to analyze the dynamic features of crank connecting rod mechanism, that is when entering material parameters, different directions have different value, so it can simulate combined stiffness of every directions, and it will also simulate the relative movement relationship of components effectively. Through the analysis of three group of different value of anisotropic virtual material, drawing the conclusion that it is feasible that use anisotropic virtual material to simulate the characteristic of combined structures. The method is a breakthrough in analysis of dynamic characteristic of combined structure. The virtual material method is different from traditional virtual material method in this paper.
Gust Response Parameter Optimization of Two-Dimensional Airfoil Section
Authors: Bi Ying , Wu Zhi Gang , Yang Chao
Published: July 2013

Taking the two-dimensional airfoil section model with two degrees of freedom as the object, this paper develops a multi-parameter optimization method, which regards the minimum system response under the given gust disturbances as the objective function and gives the expression describing the state space form of response sensitivity in which the matrix parameter sensitivity solution obtained by CVD method, further more, the Newton iteration method based on the sensitivity is adopted to realize the parameter optimization. By the simulated calculation of numerical examples and comparing with the conventional method, the optimization method has the advantage of better calculation efficiency and robustness and being used for aircraft design.
Study on Deloading Properties of Perforated Sound Barriers
Authors: Han Jia Qi , Xiao Xin Biao , Wu Bing , Jin Xue Song , Zhao Xin
Published: July 2013

Based on the 3D unsteady incompressible Navier-Stokes equation and the turbulent model ofk-εtwo equations, the processes of electric multiple units CRH380B passing by sound barriers installed on viaducts at the speed of 350 km/h were numerically simulated by finite volume method. The aerodynamic impulse pressure on sound barriers was analyzed. The distribution of impulse pressure on perforated sound barriers was compared with that on those with no holes. Effects of the shape, the size, the density, and tilt angle of the holes on deloading properties of perforated sound barriers were investigated. The numerical results show that the deloading properties of perforated sound barriers with circular holes are similar to those with square holes. The holistic distribution of impulse pressure on perforated sound barriers is similar to those with no holes. The density increases in two different directions has almost the same influence on the deloading properties. Deloading properties of perforated sound barriers become worse when tilt angle of holes increases.
An Improved Correction Method for Bridge Deflection Sensor Base on Support Vector Machine
Authors: Hu Shun Ren , Xiong Wen Chao , Zhao Hong
Published: July 2013

The initial state of deflection sensor after replacement is not easy to be found. In order to overcome this disadvantage of the existing method,an improved deflection correction method is presented in this paper. The new method converts the problem into anglicizing the deviation of monitoring point. By using correlation analysis and SVM,the theoretical value can be obtained. The deflection deviation could be calculated by analyzing the theoretical value and the measured value. And then the deflection after correction is easy to be obtained. Numbers of experiments are done by using the real data of Caiyuanba Yangtze River Bridge. Results show that the mean square error of the new method is less than the existing method. The new method solves the problem of finding the initial state, and the precision is improved at the same time.
Alloying Element Ta Effect on Microstructure of Co-Al-W Superalloy by Vacuum Arc Melting
Authors: Zhao Wen Jun , Xu Yang Tao
Published: July 2013

Co-based high temperature alloys have been widely used in aeronautics and astronautics industry, because of its high strength at high temperature, excellent resistance of hot corrosion and oxidation. Unlike the traditional Co-based superalloys, strengthened by solution and carbide strengthening, the novel Co-Al-W superalloys are strengthened by a ternary compound with the Ll2 structure γ-Co3(Al,W). And the novel Co-Al-W superalloys showing high-temperature strength greater than those of conventional nickel-base superalloys, will become the candidates for next-generation high-temperature materials. We research alloying element Ta effect on microstructure of Co-Al-W superalloys by vacuum arc melting. Compare with the microstructure before and after adding alloying element Ta of Co-Al-W superalloy, we find that most of Ta element distributed in the γ-Co substrate phase, stabilizing and reinforcement the γ phase.
Application of Low-Field Nuclear Magnetic Resonance (LFNMR) in Characterizing Coal Pores and Permeability
Authors: Liu Jun Gang , Liu Da Meng , Yao Yan Bin , Wu Jian Guo , Li Jun Qian
Published: July 2013

Low-field nuclear magnetic resonance (LFNMR) is a rapid, nondestructive analytical method which has been proved to be attractive for its application in brittle and easily compressed coals. In this paper, the relationships between NMR parameters and coal pores were analyzed by the NMR measurements of six coal samples with different ranks using AniMR with the resonance frequency of 12.15MHz. Results show that NMR porosity usually compare well to water porosity and be lower than He porosity, and the NMR porosity at echo spacing of 0.3ms sometimes underestimates the coal sample, lower than water porosity by >1 porosity unit. In contrast, the NMR porosity at echo spacing of 0.1ms is acceptable for characterization of coal reservoir. The difference of NMR porosity at different echo spacing may relate to the vitrinite content. Based on the T2c model, the transverse surface relaxivity of coal is calculated and it ranges from 0.25 to 20 um/s, commonly lower than 5um/s. The producible porosity could be a parameter used to estimate coal permeability, however there still needs a lot of work to construct a perfect method for this.
Monitoring System of Battery Pack Based on PhotoMOS
Authors: Li Wang Biao , Cai Li Ping , Su Wei Da , Cai Shen Zheng , Wu Yun Ping
Published: July 2013

To solve the problems of online monitoring system for high-voltage battery pack in series, this paper states the design of a practical interface circuit. The circuit consists of PhotoMOS, MCU and electrical switch. The PhotoMOS controlled by MCU could connect the measuring battery to measuring circuit, meanwhile the other batteries are physically isolated from the measuring circuit, and has no influence to the measuring circuit. This method effectively lowers the complexity of circuit, and improves measurement precision.
Nanocluster NVM Cells Metrology: Window Formation, Relaxation and Charge Retention Measurements
Authors: Ievtukh V.A. , Nazarov A.N. , Turchanikov V.I. , Lysenko V.S.
Published: July 2013

In the paper a measurement technique for study main technical and physical parameters of nanocluster non-volatile memory capacitance cell is presented. The charging/discharging process features associated with nanoclusters (nanocrystals) incorporated into gate dielectric are discussed. Original equipment for fast capacitance measurements based on computer interfaces is considers.
Experimental Research of Foamed Ceramic Composite under Dynamic Loading Using SHPB
Authors: Li Xu Yang , Huang Rui Yuan , Li Yong Chi , Gao Guang Fa
Published: July 2013

The Split Hopkinson Pressure Bar (SHPB) is used to investigate the dynamic compressive mechanical behavior of a new foamed ceramic composite under impact loading. The stress versus strain curves are obtained under high strain rates. The test results are considered to be able to assure conformability of the tests, validate the stress equilibrium assumption, and show that the stress versus strain curves of foamed ceramic composite display strain hardening effect and damage softening effect as brittle materials. Meanwhile the curve includes short plateau region while no densification region.
Development of Pressuremeter Test
Authors: Alzubaidi Radhi M.
Published: July 2013

Insitu tests are mostly considered to be cheap, quick and they are used sometimes to measure certain insitu properties ,such as modulus and lateral stress not readily evaluated by laboratory tests. A form of insitu investigation which is receiving increasing recognition is the pressuremeter. The pressuremeter devices and tests experienced extensive development in both , the technical aspects and the interpretation theories which been used extensively in several testing laboratories . In the present research a comparison between different theories used to evaluate the pressuremeter tests where different were found when using different results for the same test .
Analog Circuit Fault Diagnosis Based on Volterra Series
Authors: Xu Ping , Wang Kai , Geng Li
Published: July 2013

The Volterra series are a functional series.Its kernals both in time domain and frequency domain have definite physical significance and are independent with the system input. Thus the kernals can reflect intrinsic nature of the system. Thus the Volterra series can be used to analyze the nonlinear analog circuit.The fault feature can be extracted based on the direct analysis on the frequency response of nonlinear analog circuit so as to detect the fault in nonlinear analog circuit.
Study on Fault Diagnosis Technology for Band Sawing Machine
Authors: Chen Guo Jin , Ni Jing , Liu Ting Ting , Chen Hui Peng , Xu Ming
Published: July 2013

Aiming at the low automation level and the non-completeness of the fault diagnosis technology for the band sawing products in China and in our province, this paper studied the digital control system based on extracting the flutter amplitude characteristics of the band saw blades in real time, developed the adjustable device which clears the sticky chips between the saw teeth based on the brush friction change according to the inclination angle Φ between the brush disk and the saw blade, and designed the state recognition system for the hydraulic oil circuits of the sawing machine based on detecting real-timely the oil temperature, pressure, flow rate and hydraulic cylinders displacement and transmitting wirelessly. So it can improve the grade, efficiency, reliability and service life for the band sawing machine.
INS/GPS/MNS Integrated Navigation System with Federated Kalman Filtering
Authors: Jiang De Ning , Muluneh Mekonnen Tulu
Published: July 2013

A multi-sensor integrated solution that combine complementary features of the Global Positioning System (GPS), inertial navigation system (INS), and magnetometer is presented due to GPS-aided inertial navigation system (INS) provides poor observability of heading angle. In addition, Based on the principle of federated Kalman filtering and Adaptive Extended Kalman Filter, the algorithm is presented also for accuracy of positioning and attitude, rapidity, and error tolerance of the navigation system. The algorithm is implemented in the integrated navigation system. Experimental results show that the observability issue is solved and improvement in accuracy.
Research on Pressurizer Pressure Control System of 900MW Pressurized Water Reactor Nuclear Power Plant
Authors: Zhang Guo Duo , Yang Xu Hong , Qiao Si Yu , Wu Yu Jun
Published: July 2013

It is of vital importance for the pressurizer to maintain the pressure of primary coolant because the sharp change of coolant pressure has a direct impact on the security of reactor. The study of pressurizers pressure control method is highly important and meaningful. This paper presents the researching and designing on pressure control system of a pressurizer implemented in a nuclear power plant. Both the present situation of the nuclear power and some relevant background have been briefly introduced. Proceeding on the records of simulation, we succeed in establishing the applied modeling of pressurizer and further propose the PID control technology working as control algorithm. The best set of controller parameters are chosen through comparing the results including regulation time, overshoot suppression and stability. On the base of such control method, we attempt to add neural network control technology to achieve further improvement, which turns out available and satisfying.
Optimum Design of the Cooperation Objective for Computer Vision-Based UAV Autonomous Landing
Authors: Feng Dong Wu , Xu Gui Li , Wang Biao , Tian Yu Peng , Ye Yong Qiang
Published: July 2013

In this paper, a novel approach to improve the infrared cooperative object for accurately landing is proposed. We present the designed cooperative object system and the blurring around the object when its working, and then begin our basic research on the cooperative object. We analyzed the formation principle of thermal blurring in the infrared imaging mechanism. After a detailed analysis infrared thermal blurring from thermodynamic principle, we derived the main factors of the infrared thermal blurring, and used Fluent simulation software to simulate the formation of thermal blurring. At the same time, the paper optimized the design of cooperation target to reduce thermal blurring. Experiments show that the optimum design of the cooperation objectives thermal blurring has significantly improved compared with some other methods.
Proteus for the Design of the Heat Treatment Process Parameters Control System
Authors: Wu Feng Jie , Guo Zhong Hua , Huang Wen Kai
Published: July 2013

The paper introduces Proteus virtual development techniques into the design of the heat treatment process parameter control system, and takes each heat treatment furnace controller unit for example to explain Proteus simulation circuit of hardware and software design methods. And finally, we achieve the soft parallel hardware co-development of the microcontroller system, which can effectively save hardware resources and improve the development efficiency. Simulation results and theoretical analysis prove the correctness and the accuracy of Proteus virtual simulation, having very important significance in the microcontroller virtual development.
A New Method of Data Pre-Processing to Two-Way Satellite Time and Frequency Transfer Experiments
Authors: Wang Chang He , Li Wei Chao , Ou Ji Kun , Yang Xu Hai
Published: July 2013

Based on the basic theory of two-way satellite time and frequency transfer (TWSTFT), the mathematical model on real errors of observations is established in this paper. However, the model is rank-deficient. In order to solve this problem effectively, the paper introduces the algorithm of combining parameters, and applies Quasi-Accurate Detection of Gross Errors (QUAD) proposed in reference [ to data pre-processing. The method programs opportune algorithms and resolves the problem of detecting gross errors. In the end, the method has been verified to be successful by calculating and analysing simulated data and practical measured data.
Investigation of the Photoelectric Characteristics of ZnO Nanowires on AZO Thin Film
Authors: Wang Li Hsiang , Yang Su Hua , Hsh Yi Ming , Chang Ming Yu , Hsueh Ting Jen
Published: July 2013

This experiment applied the vapor transport method and the AZO catalyst, and successfully grew ZnO nanowires on silicon substrate. The results showed that the factors such as the position of growth substrate, temperature, temperature rising rate, growth time, gas flow volume, and the proportion of ZnO and carbon composition powder, could decide the quality and characteristics of ZnO nanowire. Optimal conditions for ZnO nanowire growth were: carbon and ZnO powders mixed at a 1:1 weight ratio to serve as the material for growing nanowires, located at a distance of 10 cm from the silicon substrate which already had AZO thin film deposed on it; the growth temperature was set at 1100°C for a continuous duration of 70 minutes; the flow volumes of the nitrogen and oxygen gases within the furnace pipe were 70 and 60 sccm, and the furnace pipe temperature rising rate was 20°C/min. In addition, it was observed by FE-SEM that when the substrate was away from the source material by 10 cm, there was nanowire with the radius of 0.11μm and length of 9.3μm. By X-ray we found the characteristic wave summit of ZnO with lattice parameter a = 0.3249 nm and c = 0.5206 nm, was in fine single crystal structure and the directions were all in (002).In field emission measurements, when the current densities was 0.1μA/cm2, the lower initial electric fields corresponding to it was 0.11 V/μm and had the best field enhancement factor with a value of 1782.
Combination Model for UTC-UTC (NTSC) Time Offset Long-Term Prediction and Precision Evaluation
Authors: Ren Ye , Li Xiao Hui , Xue Yan Rong , Li Yu Wei
Published: July 2013

Coordinated Universal Time (UTC) is regarded as reference time scale for the worldwide time coordination. In order to steer master clock in timekeeping laboratory, it is necessary to make a prediction of UTC-UTC(Lab) time offset for 15~45 days. The prediction is based on two considerations, data size and prediction model. Compared with quadratic polynomial model and grey model, calculating results show a combination model based on 9 months data size is fitter to secular predicting in terms of both stability and accuracy.
Integrating Controlling and Anthropomorphic Affordances on Smart Product Design
Authors: Ying Fang Tian , Wang Guan Yun , Tao Ye , Cai Jian Xing
Published: July 2013

The intelligent trends in the household environment result in the growing expectations for interactive experience. However, most traditional products do not meet the emotional demand of customers because of their rigid operation mode and aesthetic form. This paper is going to present a system combines potential control awareness of the user and anthropomorphic responsive behaviors of the objects to help creating brand new smart products. A smart lighting model is explored to explain specific details by two application scenarios: anthropomorphic affordances of perceiving control behavior and the idle state. The work aims at creating a new form of product that enrich the emotion value of daily commodities in household environments and enhance emotional communication with human.
Design of Low Power Underwater Acoustic Receiving Circuit with Digital Gain Control
Authors: Tang Ya Fei , Xiong Jian Ping
Published: July 2013

We propose a design of low power underwater acoustic receiving circuit by inverted echo sounder (IES) for observing the internal waves of the ocean in a long term. To receive the echo of the underwater targets, the underwater acoustic signal processor is required to be insensitive to strong noise and work in large dynamic range. In this work, with the variant application environments, to reduce the load of the subsequent processing modules, the circuit with digital gain control is employed to amplify the weak signals. Then, the out-of-band noise and higher harmonic are filtered out. The output is finally obtained by the 24-bit high-precision A/D sampling. Experiments demonstrate that the proposed design of the circuit performs with low power consumption, low noise, large dynamic range, flexible frequency selectivity, high precision and anti-inference.
Brain Functional Network Based on Mutual Information Analysis of EEGs and its Application to Schizophrenia
Authors: Huang Li Yu , Zou Jia , Ma Hong Juan , Zhao Jing , Shi Jian Guo
Published: July 2013

This paper presents a novel construction method of brain functional network by using spatial mutual information to estimate quantitatively correlation between different channels of electroencephalogram (EEG) signals. Firstly, 32-channel EEG signals were collected and the alpha rhythm of each signal was extracted by a wavelet packet filter, the spatial mutual information of different EEG channels was calculated respectively, the appropriate threshold was selected to construct the functional network. Then the research framework was applied to characterize the brain network difference of the schizophrenic patients and the control group. The result indicates that the network construction method proposed in this paper could portray different brain function states and it also can become a new effective method in analyzing and understanding the mechanism of patients with schizophrenia and other mental illnesses.
Development of the Subsurface Detection System of Drilling Robot
Authors: Jian Xiao Gang , Li Xiao Hua , Xu Xiao Xiang , Shi Lai De
Published: July 2013

In this paper, the current domestic and overseas research status of subsurface drilling robots was investigated, and then, the theoretical basis, performance and defects of application of the main methods of subsurface detection technology was analyzed and compared. According to the requirements of subsurface detection system of drilling robot, authors propose to build the detection systems of subsurface drilling robot on miniaturized impulse GPR. Relative research results will strongly support the development of subsurface drilling robot, and it is ofgreat practical significance and social benefits tocarry on further studyof the subsurface exploration, development and rescue technology.
Research on Helicopter Stabilator Control System
Authors: Sha Hong Wei , Chen Ren Liang
Published: July 2013

to deal with the problems caused by the fixed stabilator, the movable stabilator and its installation angle control system have been researched in this paper. Base on the analysis of the influence of movable stabilator on helicopter longitudinal flying qualities, the control structure of the installation angle control system has been designed and its parameters are figured out with SQP method. The control system raised in this paper could be useful to instruct the movable stabilator installation angle control system design.
Failure Analysis in Hydraulic System of the Polar Expedition Buoy which is Based on Virtual Prototype
Authors: Wang Shi Ming , Ai Xian Zhu , Ma Li Na
Published: July 2013

Introduced the particulIarity circumstances of polar exploration buoy in contrast to normal buoy., raised the important academic value and practical meaning of the research of failure of the polar ocean observing buoys. This paper is based on ,a pair of gear pieces in hydraulic system of polar buoy, and made the virtual prototype simulation experiment on the fault gear pieces. By comparing of the normal meshing with broken teeth meshing which drew the presence of failures, and then analysis the CM acceleration both in time-domain and frequency-domain of fault gear in different rotating speeds, which verify the correctness of the simulation.
The Laser Scanning System Calibrations in Unmanned Yard
Authors: Zhang Shi Hui , Zhu Fang Wen , Yuan Zheng Peng , Chen Jin Bo
Published: July 2013

In an unmanned yard, some parameters of the system would change due to equipments wear and deformed. These changes resulted in the 3D reconstruction parameters changing. The inaccuracy of the 3D reconstruction parameters decreases the system operating efficiency and result in the waste of resources and energy. In this paper, a rapid laser parameter calibration algorithm was discussed, the experiment result in a real unmanned yard show this method is feasible.
Numerical Simulation of Ammonia Flow Boiling in a Horizontal Circular Tube
Authors: Wang Sheng Long , Ge Yin Hai , Li Wen Hao
Published: July 2013

In order to understand the variation of ammonia as a cooling refrigerant, the ammonia coolant is being used in power plant air cooling system. The subcooled boiling phase transformation of ammonia in a horizontal pipe tube was simulated through the application of the CFD fluid computational platform, the fluid state parameters in the tube were given at the same time. The speed variation along the axis of the tube was obtained, the speed is increasing, the Reynolds number corresponding substantial increase in the convective heat transfer coefficient corresponds to raise; The vapor volume fraction and boiling heat transfer coefficient along the tube were obtained. The boiling can strengthen the heat transfer significantly. The results showed that the ammonia as a cooling refrigerant by raising the Reynolds number and the use of the latent heat absorb these dual characteristics to improve the heat transfer coefficient is worth promoting.
A New Spray Desuperheater Structure Design
Authors: Wang Yi , Zhu De Ping
Published: July 2013

A new spray desuperheater is designed, whose characteristic is using the combination technology of centrifugal nozzle and two-level venturi pipes. According to the application of the technology, the paper reveals the technical principle and structure design. The spray desuperheater has excellent spray atomization effect, and it can regulate the steam temperature in a wide range. So it can ensure the efficient heat exchanger and safe operation for boiler.
Modal Analyses of Rotating Gears for Compound Oscillatory Roller Transmission Gearbox
Authors: Shen Yun De , Ma Guang , Cheng Tai Hong , Li Yong
Published: July 2013

The pre-stressed modal properties of planetary gears of compound oscillatory roller transmission gear reducer considering the external torque and rotating angular velocity were calculated in this work. For the boundary conditions, the large torque was considered to output gear and angular velocity for applying to middle gear. The resonant frequencies of output gear under external torque were a little higher than the case of no external loads, because the stiffness of gear will be changed with external loads. But the resonant frequencies of middle gear show the no changes under rotating angular velocity, because the low angular velocity and no stiffness change with structure of gear. Finally from the cambell diagram, the calculated resonant frequencies were in the range of safety.
Design and Research on Device of Generating Power by Wind and Wave at Sea
Authors: Wu Zi Yue , Gao Ting , Zhang Shuai
Published: July 2013

According to the current global energy shortage crisis, a kind of generation device for hybrid power of wind and wave is designed. The basic components of the power generation device and the design plan are introduced, and also the working process of the device is elaborated. In the design process, the two energies are superimposed and mixed by the ratchet mechanism and addition institutions. This mixed approach is feasible by theoretical calculation, and the design inadequacies are found in the calculation process, so the power generation device is improved. The device is of good mixing and superimposing on wind and wave energy, the structure of power generation device is stable and reliable, and the device owns certain referenced value to the future research on generating power by wind and wave at sea.
Development and Application of a High-Thrust Voice Coil Motor
Authors: Chen Gang , Lin Qiang , Wang Lei , Chen Xu
Published: July 2013

A Voice Coil Motor (VCM) for precise positioning with high output force was designed. The stability and heat dissipation of VCM were analyzed. The performance of VCM was also compared with that of the same type VCM produced by SMAC. Uniaxial ratcheting behavior of solder wire (Sn63/Pb37) was studied by uniaxial cyclic stress controlled tension deformation tests,to verify the VCM systematically.
Research for High-Voltage Nanosecond Rectangular Pulse Generator
Authors: Yao Xue Ling , Lin Tian Yu , Chen Jing Liang
Published: July 2013

In order to calibrate the response characteristic of voltage dividers, the article presents a potable high-voltage nanosecond rectangular pulse generator based on the transmission-line theory. The generator consists of DC high-voltage source, pulse forming line (PFL), special high-voltage switch, pulse transmission line (PTL), resistive load and coaxial voltage divider. The compact charging and discharging circuit is developed coaxially and the interference proof performance is excellent. The voltage amplitude and the pulse width can vary from the output of the DC high-voltage source and the length of PFL respectively. In the article the theory of pulse forming process, the design and the key devices of the generator are investigated theoretically and experimentally. The experimental results demonstrate that the generator can meet the measurement demands and export well-defined rectangular pulses with the rise time less than 751.738ps and the voltage amplitude up to 2kV.
Analysis of the High Order Terms on Periodic Solution Bifurcations of the Generalized Duffing Systems
Authors: Chen Shi Dong , Wu Zhi Qiang
Published: July 2013

This paper focuses on the effectsof the high order term in Duffing equation. Firstly the averaging equation andthe bifurcation equation are deduced through the multiple scale method.Secondly, the transition sets and several different bifurcation diagrams areobtained based on the singularity theory. The result shows that the high order term induces richer bifurcationcharacteristics.
A Real Time Vehicle Collision Sensor and Reporting System Using Load Sensor, GSM and GPS Technology
Authors: Muluneh Mekonnen Tulu , Jiang De Ning , Feng Yong Xin
Published: July 2013

Vehicle collision sensor system and reporting accident to police is an electronic device installed in a vehicle to inform police man in case of accident to track the vehicles location. This system works using pressure sensor, GPS and GSM technology. These technology embedded together to sense the vehicle collision and indicate the position of the vehicle or locate the place of accident in order to solve the problem immediately (as soon as possible).For doing so AT89S52 microcontroller is interfaced serially to a GSM modem, GPS receiver, and pressure sensor. A GSM modem is used to send the position (Latitude and Longitude) of the vehicle, the plate of the vehicle and the SMS text from the accident place. The GPS modem will continuously give the data (longitude and latitude) and Load sensor senses the collision of the vehicle against obstacles and input to microcontroller. As load sensor senses the collision, the GSM start to send the plate of the vehicle, text message and the position of the vehicle in terms of latitude and longitude in real time.
Visual Experiment and Analysis of Erythrocyte High-Speed Collision in Microchannel
Authors: Lu Zheng , Ping Li , Ji Gao , Di Zhang
Published: July 2013

Red blood cells suspension was infused into the microchannel in micron-sized made of PDMS and this leaded to the collision between the red blood cells and the wall of the microchannel. The microflow video was observed and recorded with optical microscope and high-speed camera used. The visualizing of the movement and collision of red blood cells was achieved. The flow images were optimized and the values of the geometric parameters of the red blood cells at different positions were obtained. Combined with the experimental data, the fitted curves of the geometric parameters on the axis of the microchannel were achieved. Besides, the comparison among the flow characteristics for different flow rates was also completed. It turned out that the width of erythrocytes in the microchannel increased and the length decreased continuously along the flow direction, so did the elongation. Erythrocytes gradually developed into tabular shape from initial slender shape along the flow direction. Whats more, the trends of the geometric parameters at different flow rates showed obvious similarity.
Simulation and Analysis on Grating Lobe Effect and its Avoidance for Planar Phased Array Antenna
Authors: Li Wei , Liu Zhen , Tian Shu Lin , Huang Jian Guo
Published: July 2013

Grating lobe effect often exists in the measurement and simulating of phased array antenna's directional pattern. The emergency of grating lobe effect often leads to angle multi valuedness, which will result in the receiver error tracking the grating lobe. The traditional papers mainly focus on the grating lobe effect of linear phased array antenna, whereas pay little attention to the planar phased array antenna. Thus, in this paper, the cause, location and avoidance of grating lobe effect of planar phased array antenna are investigated in theory and the correctness of conclusion was verified by using simulation experiment. The result shows that the method proposed in this article will play a guiding role in engineering practice of restraining the grating lobe effect.
Modeling and Numerical Solution of Four-Quadrant Pump Characteristics Test Data
Authors: Zhang Xin Min , Zhao Yu Yan , Tao Jie Yu , Wang Yan
Published: July 2013

In some cases, combined use of a few centrifugal pumps can be seen frequently. In some working conditions, some of them may work under abnormal mode (take turbine mode for example). So it is needed to know the characteristics of pumps under the modes. One way to obtain the characteristics is test. In this paper, a nonlinear mathematical model is presented to describe the characteristics. The solution to the model is performed by a specialized particle swarm algorithm. A numerical example shows good agreement between model curves and pump test data.
Output Feedback Stabilization of Networked Control Systems with Time-Varying Delay
Authors: Zhang Xue Feng , Shen Yan Xia , Zhang Hua Ping
Published: July 2013

The problem of output feedback stabilization for networked control system with time-varying delay is discussed. By constructing a novel LyapunovKrasovskii functional,the output feedback controller is obtained in terms of LMIs. The dynamics information of the time-varying delay is taken into account in the structured controller, and the obtained result is less conservative. A numerical example is given to illustrate the effectiveness of the presented method.
On-Board Power Simulation Training Evaluation Model Based on Improved Gray Analytic Hierarchy Process
Authors: Xiao Liang Fen , Bu Le Ping
Published: July 2013

We frist establish the evaluation index system according to the characteristics of the simulation training system through analysis, and second , we calculate the index weight use improved gray analytic hierarchy process which simplify the steps of the original analytic hierarchy process. Third we use the Delphi method to establish the membership degree of every evaluation index, and finally we use fuzzy comprehensive evaluation method to get the evaluation results of the simulation training system, the results show that the evaluation model is consistency to the expert assessment , meet the actual needs, is an effective method of power system simulation training assessment.