bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Application of Wind-Solar Hybrid Power Supply System in Environmental Monitoring System
Authors: Xie Chang Wu , Gao Yan , Zhang Guo Feng
Published: March 2013

A wind-solar hybrid DC power supply system for small wireless sensor devices is introduced in this paper. The environmental monitoring system is selected as the application platform, and ARM microprocessor is selected as the control core. With the use of the multi-stage constant current technology, the battery life and charge efficiency are optimized. With the design of LCD module and RS232 interface in the system, the difficulty of the system debugging and maintenance are reduced while the flexibility of the system is increased. The experimental result shows that the most use of wind and solar energy is realized in this system.
Oriented Reduced-Pressure Melts Growth of the Vacuum Ultraviolet Double Frequency Crystal KBe2BO3F2
Authors: Wang Wen Li
Published: March 2013

A bulk vacuum ultraviolet double frequency crystal KBe2BO3F2(KBBF) crystal has been grown successfully by using a method of oriented reduced-pressure melts growth, and the optical properties of the grown crystal, such as optical transparency and the second harmonic efficiency, were also measured. The results show that the high-frequency absorption edge is observed at 150nm and the optical transparency was up to 75% in the spectral range between 250nm and 400nm. The second harmonic efficiency was measured with an outer cavity frequency-doubling method and its maximal value was about 68.5%. The experimental researches indicate that the oriented reduced-pressure melts growth is a promising growth method for bulk KBBF crystal and it is possible for applying as a frequency-doubling device for the vacuum ultraviolet region.
Simulation of Temperature Distribution in Current Transformers with Current Flow
Authors: Yan Zhen Hua , Ren Xiang , Ren Hang , Ding Wei Dong
Published: March 2013

On-site experience suggests the possibility of condensation of the moisture in Current transformers (CTs) which is impossible theoretically if temperature distribution in the CT is uniform. In order to study the temperature distribution in a typical CT, finite element analysis software (COMSOL Multiphysics) is used to obtain the temperature distribution of the outer surface and inside of SF6 in CT in different ambient temperatures (20 °C to-10 °C). Besides, experiments are conducted to obtain the temperature of different positions on the CT surface that correspond to conductor, shell, spacer and porcelain bushing that are inside the CT with different ambient temperature. Both simulation and experiments show that temperature distribution in the CT is non-uniform, and the closer the part is to the conductor, the higher the temperature. Furthermore, maximum temperature difference remains about 35 °C in both simulation and experiments with different ambient temperatures from 20 °C to-10 °C.
New Method to Identify Transformer Inrush Current Based on FFT and SVM
Authors: Gong Mao Fa , Li Guo Liang , Xia Wen Hua , Yan Hong Lin , Qu Jing Wen , Wang Xiao Yu
Published: March 2013

To improve transformer longitudinal differential protections reliability, this paper deeply analyzes generation mechanism and characteristic of transformer inrush current, and uses PSCAD/EMTDC software to simulate 188 kinds of transformer operation states. They are including internal fault current, inrush current and no-load closing with internal fault. On the background of those simulations, it proposes a simple and accurate method to identify inrush current based on SVM. SVM selects Gaussion Kernel, and takes three-phase differential current, fundamental, secondary harmonic and third harmonic as characteristic quantities. Many cross-validation results verify that the training SVM has high accuracy. This method can identify inrush current and internal fault current (including no-load closing with internal fault current) rapidly and accurately. It takes less time, and is easy to perform.
EKF-Based 6D SLAM for Air-Duct Cleaning Robot Using Inertial Sensor and Stereo Vision
Authors: Wang Cong , Sun Wei , Bu De Xu , Zhou Zhi Wei
Published: March 2013

The air-duct cleaning robot (ADCR) is an effective and safe tool for accomplishing terrible cleaning work in an air-duct network. In this paper, a six-dimensional simultaneous localizing and mapping algorithm based on multi-sensor information fusion is proposed to improve the ADCR's autonomous ability in unknown duct environment. By combing an inertial measurement unit (IMU) with a stereo camera and fusing the measurements of sensors with the extended Kalman filter, the uncertainty of measurement caused by noises can be bounded in a low level. Furthermore, the performance of the proposed scheme was proved to be accurate and robust with experiments in an experimental ventilation-duct environment.
Modeling of Q – V Diagram Using SPICE for Electrostatic MEMS Converter Found in Energy Scavenging Systems
Authors: Salem Mona S. , Salem Marwa S. , Zekry A.A. , Ragai H.F.
Published: March 2013

The objective of this paper is to model the behavior of an electrostatic MEMS converter using its Q – V diagram. This model is used to sense the required instants to charge and discharge the converter. By this way the design of the converter’s controller circuit can be carried out. The converter model is implemented using SPICE circuit simulator based on discrete components. As a result, the charging and discharging instants of the converter are determined.
The Analysis of Aerodynamic Load for High Speed Centrifugal Compressor Blade
Authors: Zhu Gui Hua , Qiu Tuan Hui , Xie Min
Published: March 2013

With the ANSYS Workbench software,the 3D fluid model of the impeller for the centrifugal compressor is set up,whose design flow is 3.2kg/s,rotating speed is 32473r/min,pressure ratio is 3.8,and then with the method of CFD,the k-ε two equations model is selected as the turbulence model,in the condition of design speed,the fluid region of the impeller is simulated under eight different flow rate,the aerodynamic load of the impeller blade and its distribution is acquired under different flow rate,the results showed that the location of the largest aerodynamic load is in the blade that near the outlet of impeller,under the design flow rate condition,the largest aerodynamic load is 0.1969MPa,the aerodynamic load increases with the flow rate decreases.
Experimental Study on Turning Vibration Responses of Cutting Tool Surface Based on the Self-Power Spectral Density
Authors: Zhang Qiang , Li Shun Cai , Shao Ming Hui , Li Wei
Published: March 2013

Abstract: By means of the analysis instrument of vibration signals and acceleration sensor, the vibration responses of the upper and lower surface of the cutting tool are tested in the turning process of the numerically controlled lathe under the different spindle speed, and the time series curves and the self-power spectral density curves of the acceleration vibration signals of the cutting tool are obtained. The study indicates that : the vibration energy corresponding to the upper surface of the tool is much larger than that of the lower surface, and the vibration frequency corresponding to maximum self- power spectrum density of the tool on upper surface is about 150Hz, but the vibration frequency of the lower surface has a big fluctuation.
Comparative Analysis of Industrial Restructuring in the Resource-Based Cities Based on Shift-Share Method
Authors: Chen Dong , Jiang Yun
Published: March 2013

This article uses the shift-share method of Pingxiang City, Jiaozuo City, Benxi City and Dalian City industrial restructuring comparison, then find out the gap between regional economic development, and to the decision-making reference for the development of industrial restructuring policy in Pingxiang.
Research on Topological Insulating Materials Induced by Uniaxial Strains with Properties of Insulating Materials
Authors: Han Hong Pei , Dong Xin Ping
Published: March 2013

A series of calculations are carried out to investigate systematically the electronic band structure of bulk HgTe under uniaxial strains with the relaxed-volume by means of the full potential linearized augmented plane-wave method. Our results show that there is a topological insulating phase induced by proper uniaxial strains, which is consistent with previous theoretical and experimental results. Interestingly, the strain-induced band gap is large up to 0.21 and 0.17 eV in expansion and compression along c-direction, respectively. It is indicated that the bulk HgTe under proper uniaxial strains would be possibly made the room temperature application for material engineering with low energy consumption.
Simulation and Optimization of High-Purity Trichlorosilane Distillation Process with Analysis of Material Properties
Authors: Zhang Yuan Di , Xie Gang , Hou Yan Qing
Published: March 2013

The new two-tower process of thrichlorosilane distillation consisting of removal of light components after removing heavy components is analyzed by assistant of a chemical process simulation software. In order to achieve lower energy consumption, the parameters for each tower in the new process are optimized, such as the number of theoretical plates, the position of feed plate, reflux ratio and distillate (bottoms) to feed ratio. The results show that the optimum parameters for the first tower are the number of theoretical plates of 32, the position of feed plate of 24, reflux ratio of 2.5 and the distillate to feed ratio of 0.8516. For the second tower, the number of theoretical plates, the position of feed plate, the reflux ratio and the bottoms to feed ratio are 80, 16, 143 and 0.9652 respectively. Applying the optimized results in practical production, mass fraction of PCl3 in overhead of the first tower is reduced by two orders of magnitude, condenser duty and reboiler duty of the second tower are dropped by more than eight percent while obtaining higher purity trichlorosilane products.
Influence of Nanomaterial and Technology on Cellular Structure and Signal Transduction
Authors: Hou Li Juan , Li Bing Hui
Published: March 2013

Nanomaterial is a field that takes a materials science-based approach to nanotechnology. The toxicity and values of nanomaterial are largely dependent on their effects on cellular structure and function. Research has focused on the cellular internalization and metabolism of nanomaterial. Little attention was paid to their actions on cells. This paper overviews current reports about the effects of nanomaterial on cellular structures of membrane, cytoskeleton, nuclear and cellular signal transduction.
Study on Giant Magnetostrictive Material with Design and Simulation of Displacement Magnifying Mechanism
Authors: Zeng Fan , Lou Jing Jun , Zhu Shi Jian
Published: March 2013

In order to make full use of advantages of giant magnetostrictive material and to improve output characteristics of giant magnetostrictive actuator, displacement magnifying mechanism is designed based on flexible hinges. The design parameter of the flexible hinges and strength of material of flexible hinges are calculated. Based on the analysis and comparison, the statics and dynamics analysis was carried on by analytic method and ANSYS12.1 software,the input stiffness, magnifying multiple and the relationship between output displacement and load are calculated,and the stress analysis shows that the maximum stress of magnifying mechanism is less than the maximum allowable stress of materials. The resonance frequency,vibration modes and harmonic response of the mechanism were resulted by Finite element method, and the dynamics parameters of system are get.
Research of the Boron Element on Corrosion Behavior of 1Cr17 Stainless Steel in 3.2%HCl+3.8%HNO3 Solution
Authors: Guo Tie Ming , Hui Zhi , Nan Xue Li , Han Chang Song , Tang Zhong Jie , Zhou Han
Published: March 2013

Four groups of 1Cr17 stainless steel with boron quality score as 0ppm,16ppm, 22ppm and 28ppm were used to research their corrosion behavior by chemical immersion, electrochemical method (the tafel polarization curve method) at different temperature(25 °C, 40 °C) in 3.2%HCl＋3.8%HNO3 medium.The results show that at different temperature (25°C, 40°C)in3.2%HCl＋3.8%HNO3 medium, Corrosion kinetics law is different,with B element content increased,the immersion corrosion rate decreased; meanwhile, both of Soaked and electrochemical corrosion results show that the added Boron elements of the 1Cr17 stainless steel sample improves its resistance to general corrosion ,but its resistance to intergranular corrosion weakened , which can see by the corrosion morphology.
Density Measurement of Pyridine Based Ionic Liquids and Methanol Binary Mixtures
Authors: Li Zhuo , Li Chang Ping
Published: March 2013

As a new environmentally friendly solvent, ionic liquids have been investigated widely. The lack of physico-chemical properties data of ionic liquids has become a bottleneck that restricts their applications. In this study, the investigation of the density for binary mixtures of CnpyNTf2 (n = 2, 4, 5) and methanol is measured using Westphal balance. This study would be very important for the application of binary mixtures of ionic liquid and methanol in developing new energy storage material.
Research and Design of Information System for Mobile Autonomous and Open Learning Based on RIA and Integrated Framework
Authors: Cao Cai Feng , Li Gen Shen
Published: March 2013

The fast development of mobile terminals provides good conditions for constructing function-completed autonomous learning information system. This paper researches the methods of design and developing the information system, which is based on E-learning2.0 idea, Android, RIA and Web2.0 technologies. It analyzes general system architecture and application developing frameworks and puts them into practice.Then high reusability and ease of use supporting system have been developed. In technical terms, the study strives to form a development mode of mobile autonomous learning information system.In application, it strives to construct a user-centered, independent, open and rich user experience mobile learning information system.
Experimental Study on Fatty Acid Production with Properties of Biological Materials from Soybean Oil by Lipase Catalyze
Authors: Li Yong Bo , Wang Chang Mei , Liu Jing , Chen Yu Bao , Yin Fang , Xu Ling , Liu Shi Qing , Zhao Xing Ling , Zhang Wu Di
Published: March 2013

In order to get the optimum conditions of fatty acid production with properties of biological materials from soybean oil by lipase catalyze. The effects of reaction temperature, ratio of oil to water (V:V) and amount of the enzyme (the quality percentage of enzyme accounts for the soybean oil) were studied in this research. The experimental results showed that the catalytic effect of Lipolase100T lipase is the best one under the same conditions. The results are as follows: the reaction temperature is 40 degrees Celsius, the ratio of oil to water (V:V) is 1:3, the amount of enzyme (the quality percentage of enzyme accounts for the soybean oil) is 1%, hydrolysis time was 60hrs, and the acid value reaches to 160.33mgKOH/g.
The Industry Assembly Line Layout’s Modeling and Simulation in Industry Manufacturing Based on Genetic Algorithm
Authors: Guo Fang , Huang Zhi Hong
Published: March 2013

The equilibrium problem is one important aspect of industry assembly line design. This paper puts forward the method to solve the industry assembly line’s equilibrium problem based on the genetic algorithm’s heuristic procedure and on this basis it also optimizes the industry assembly line’s layout and synthetically considers the material carrying cost, plant area’s use ratio and other factors in industry manufacturing. Then it optimizes by eM-Plant simulation software and combining with genetic algorithm to efficiently acquire visual and satisfying layout effects. At last, it uses examples of industry assembly line to verify this method’s feasibility.
Study on Lengthening Technique about Concrete Material of Overpass, Culvert and Underpass
Authors: Kong Qing Mei , Lv Hong Ju
Published: March 2013

The widening of expressway refers to many overpass, culvert and underpass made of concrete material. In order to make all the structures woke normally and safely after widening, it’s necessary to study the lengthening technique about concrete material for them. When overpasses are carried on lengthening, original structures should be used as more as possible. There are 3 main lengthening methods: direct use, rebuild in another field and use after lengthening. Lengthening technique about concrete material of culvert and underpass differs when the widening method of expressway is different. In the end, the application of lengthening technique about concrete material is introduced by engineering examples.
Study on Combustible Materials with the Application Study of Curve Fitting in the Pool Fire Risk Assessment
Authors: Xie Fei , Song Wen Hua , Chen Zhen , Lv Ling Yue
Published: March 2013

The pool fire accident of chemical companies is of long time- burning, destructive, and therefore it is of great significance for the combustion characteristics of pool fire. The author has studied the combustion materials for the significance of pool fire. At the same time,this paper chooses the dichloropropane storage tank area of a company in Tianjin as the research object based on the basic theory of the pool fire and combustion materials, and builds the risk assessment model of pool fire in the fire embankment based on combustion materials. Using the regression analysis, the optimal curve equation for the target, the distance of which is X from the pool center under the condition of the given radiation is fitted and calculated to be the power function y = 49310x-2.484. Then according to the determination foundation, analyze the affect scope and extent of the fire based on combustion materials. The results show that: after the fire broke out because of the leak of the tank in the fire embankment, death and completely damage of equipment and buildings will occur to the nearby production unit; the passers-by with the passing vehicles, filling vehicles and abandoned buildings on both sides of the plant roads and abandoned buildings will suffer strong impact.
Study on Ultrasonic Vibration in Gas and Optimization of a Novel Process of EDM
Authors: Lin Yan Cherng , Chow Han Ming , Tsui Hai Ping , Chen Yuan Feng
Published: March 2013

The aim of this study is to investigate the machining characteristics of ultrasonic vibration assisted electrical discharge machining (EDM) process using gas media as the dielectric fluids. The process parameters were designed based on Taguchi method to conduct the experimental works. The main process parameters such as machining polarity, peak current, pulse duration, air pressure, working time, and servo reference voltage were chosen to determine their effects on machining performance in terms of material removal rate and surface roughness for SKD 61 tool steels. The experimental response values were transferred to signal-to-noise (S/N) ratios, and then the significant machining parameters associated with the machining performance were examined by analysis of variance (ANOVA). Therefore, the technique of ultrasonic vibration assisted EDM process in gas media was established with the concerning features related to environmentally friendly, high efficiency, and high machining quality to fit the demands of modern manufacturing applications.
Vehicle-Mounted Alarm and Navigation Positioning System with Properties of Information System for Industry
Authors: Wang Yong Liang , Qiu Zhe Dong , Liu Bin , Chen Zhi Liang , Wu Xing Li , Huang Tao
Published: March 2013

Along with the development of information system in industry, it becomes more and more important in the people’s life and industry. It introduced an alarm and navigation and positioning system with properties of information system, the system could position and gives an alarm autonomously in the vehicle and monitor outside the vehicle. As the normal running of the vehicle, the system can carry out navigation; in case of emergency, the system could alarm automatically or manually through the vehicle terminal equipment, and then, positioning the vehicle location through the information system of internet of things. After tested, the system works well and meets the requirements.
Study on Elevator Manufacturing Industry with Modeling and Simulation of Virtual Elevator Control System Based on TwinCAT Soft-PLC
Authors: Xi Yong , Yang Cheng Zhi , Xu Jin Xing
Published: March 2013

A solution is proposed to design and build virtual elevator model by software for the elevator manufacturing industry, which realize the communication between virtual elevator model and TwinCAT soft-PLC. To test the correctness of this approach, the ten layer virtual elevator model is simulated through TwinCAT soft-PLC. And the usability of simulation system and the reasonableness of control programming method are verified. The main characteristic in this new research method is to use virtual controlled object and virtual PLC. It means that all research work can be finished with full virtual system and its research results can be used well in elevator manufacturing industry.
Implementation of 3D Modeling and Visualization for CAE Industry Application
Authors: Wang Yun , Liu Su Xing
Published: March 2013

For industry CAE applications, a set of software platform was developed under OpenGL environment including modeling, meshing and visualization functions. Experiments for building an integrate circuit showed that: this platform is able to building and visualization of complex 3D models, and it provides a good basis for further development of available industry CAE software.
Research on Mechanical Industry through Control Systems of Intelligent Robots Based on ARM
Authors: Hu Lian Jun , Zeng Xiao Hui , Song Hong , Li Wei
Published: March 2013

Mechanical industry has made a great advance in automation with increasing developments in performances of processing devices. A control system of intelligent robot is designed in the paper, which based on microprocessor S3C2410 with the kernel ARM 920T and the real-time embedded μC/OS-II operating system. The design proposed extends functions of intelligent robots and improve its ability to adapt environments. Otherwise, it will do great help in automations of mechanical systems.
Mechanics Analysis of Cantilever Beam with Uniform Load
Authors: Hao Jin Ying , Bai Wei
Published: March 2013

According to the mechanics analysis of the flexible cantilever beam in the uniform load distribution, the corresponding mathematical model is established. Applying quasi-linear analysis and perturbation solution in order to convert to complex integral and differential formula into its power series form, then derives the general formula of dimensionless deflection formula. Last we further discussed the deflection formula and analysis the force situation of the beam.
Study on Environment Materials with Separation and Identification of Denitrifying Phosphorus-Removing Bacteria
Authors: Zheng Lin Hong , Luo Yu Jiao , Qiu Ling Feng
Published: March 2013

Environment material was a kind of material that considering the environment and ecology protection. Microbe as the key material of sewage treatment system played an important role in environmental protection. The paper researched that a strain of denitrifying phosphorus-removing bacteria could be isolated and screened from dephosphorization system by the conventional microbial breeding technology. The strain was preliminarily appraised itself belong to Pseudomonas sp., ultimately named as PX3.
Mechanics and Pretreatment Research of Vibration Signals for the Numerical Control Machine
Authors: Peng Er Bao , Zhang Hong Ge , Wang Hong Ying
Published: March 2013

To study vibration signals processing mechanics and the analysis method of the numerical control machine. vibration signals analysis method include time and frequent domain analysis: the time domain analysis mainly has the statistical analysis and the correlation function analysis. frequency domain analysis include spectral analysis, cepstrum analysis, data envelopment analysis. vibration signals pretreatment is the most commonly used and effective method on the mechanical device condition monitor and the failure diagnosis.
Design of Power Line Communication System Underground Based on Zigbee in Electrical Control Engineering
Authors: Jin Tao , Yang Ping Xian , Liu Zhen Bao
Published: March 2013

Abstract. It is introduced that the complementary advantages between Zigbee and PLC underground in Electrical Control Engineering, improving effectively the reliability and stability of transmission of PLC. Not only is the principle diagram of the design given, also a design of OFDM modulation and demodulation from the signal of Zigbee is realized based on FPGA. The program and simulation is designed for OFDM modulation and demodulation with ISE10.1. It is improved feasible with the data of experiences.
A Commutation Strategy for Matrix Sinusoidal Waveform Converter with High-Frequency Link in Electric Power Systems
Authors: Quan Jian Zhou , Wu Sheng Hua , Cao Peng Ju , Xu Jian Shi
Published: March 2013

To achieve safety commutation of the bidirectional switch in Matrix Sinusoidal waveform converter with high-frequency link, a decoupling time-driven strategy is proposed in this paper. The two gates in each bidirectional switch are driven by different signals, so the voltage surge caused by non-synchronous commutation of two bidirectional switches can be avoided, and both ZVS and ZCS are also achieved. Since the current polarity of load need not to be detected, the circuit is easy in realization. Experiments has been carried out to verify the feasibility of the proposed method.
The Numerical Simulation and Design of the Electrical Heating System for Electric Conductive Ultra-High-Temperature-Ceramics Test Specimen
Authors: Zeng Zong Yuan , Wu Shao Li
Published: March 2013

Serving as an important thermal segregation material for air and space vehicles, zirconium diboride has to suffer ultra-high-temperature that might be over 2700°C. However, the highest working temperature we can achieve for the testing of the mechanical properties of such kind of materials is less than 1500 °C. Moreover, the high temperature furnaces are low-usage, and have along experimental period. Making use of the satisfactory electrical and thermal conductivities, we could heat a Zirconium diboride specimen with electrical current. The electrical heating of a Zirconium diboride specimen is simulated with the commercial available finite element code ABAQUS. The temperature and cooling of copper electrodes and that of collets, is also analyzed, and the temperature distributions are obtained. In order to achieve reasonable distribution of temperature in the specimen, the copper electrodes and the collets, the corresponding cooling facilities is designed, and the cooling liquids are selected.
Minimum Amplitude of Geomagnetic Disturbance in Electrical Power System Leading to 500kV transformer DC Bias
Authors: Wu Wei Li
Published: March 2013

This article analysis the relationship between geomagentically induced currents(GIC) in electrical power system flowing through 500kV transformer neutral point in Ling’Ao power grid and the geomagnetic data observed at Guangzhou geomagnetic observatory during 2004/11 -2006/12. It is found that correlation coefficient between GIC and magnetic field component variation may be greater than that of time derivative of the geomagnetic field, which are all less than -0.5. According to the relation, The minimum amplitude of geomagnetic component variation is 7.08(nT/min) in term of transformer of single or three phase five columns while is about27.47(nT/min) when the type is three phase three columns.
Double-Loop Control of Inverter with LCL Filter in Electrical Power System Based on Improved Instantaneous Symmetrical Component
Authors: Ren Yi , Wan Jian Ru , Shi Li Guang , Liu Ran
Published: March 2013

An improved instantaneous symmetrical component method is adopted to improve the performance of inverter with LCL filter under asymmetric voltage conditions in electrical power system. Positive and negative sequence components in voltage and current in electrical power system are calculated with fewer calculation time,which is suitable for pratical application.In addition,this paper analyses active and reactive power in the system.A double-loop control strategy is proposed to eliminate the influence of double frequency components in power and negative sequence current.The simulation results verify its feasibility and effectiveness.
Research on LCR Filter in the Link of Shunt Active Power Filter in Electrical Power System
Authors: Zhang Chen Yu , Zheng Jian Yong , Mei Jun
Published: March 2013

Shunt active power filter (APF) is an electric equipment which effectively optimizes harmonic waves. By measuring the load current, it produces compensated current with opposite amplitude to the load current in order to improve the power quality of the power grid. Little has been reported on how to effectively design the LPF employed in the link of shunt APF and power system. The paper theoretically analyzes constrains for parameters of the LCR output filter, and then determines the optimal LRC filter parameters by comparing different output filter (OF) functions. At last, the experiment results further verify the correctness of the design method.
Influence of the Arc Suppression Coil with Parallel Resistance on Single-Phase Arc Grounding Overvoltage
Authors: Xue Han , Song Ji Jiang , Cui Yu Chong
Published: March 2013

Neutral point grounding method with an arc suppression coil and a parallel resistance is a method that can inhibit arc overvoltage effectively. Through the simulation of arc suppression coil with parallel resistance in the situation of different resistance value, we can obtain if the parallel resistance is too big, it will produce overvoltage in the later of voltage recovery; if the parallel resistance is too small, it is easy to produce larger grounding residual flow, going against quenching of arc; Whether over compensation or owe compensation, oversized out-of-resonance degree will cause the fault phase voltage recovery oscillation overvoltage, small out-of-resonance degree is beneficial to the fault phase voltage rise slowly.
Low Resistivity Aluminium Alloy of High Tensile Strength and Elongation
Authors: Zheng Jing Wu , He Zi , Cai Wei , Chen Si Yuan , Qiao Liang , Ying Yao , Jiang Li Qiang
Published: March 2013

Through testing the mechanical properties and electrical property, the conductive aluminum alloy with high strength and elongation was obtained by adjusting the content of Fe, B and misch metal elements constantly, and the influence mechanism of the add elements was discussed by observing microstructure morphology of the aluminum alloy. The results indicated that the addition of Fe could effectively improve the tensile strength of commercial aluminum, while the addition of misch metal could change the existence form of Fe, thus to compensating for the decrease of elongation because of the addition of Fe. On the other hand, the addition of appropriate B could remove the harmful impurity elements of the aluminum alloy and refining the grain, so as to reduce the resistivity of the aluminum alloy with adding iron and rare earth elements. Finally, the optimum was obtained which was the composition of 99.18%Al-0.75%Fe-0.05%Re-0.02%B, the tensile strength was 103MPa, the elongation was 30.98% and the resistivity was 2.737×10-8Ω•m.
Research on On-Line Anti-Icing Technology for Carenary along Electrified Railway
Authors: Guo Lei , Li Qun Zhan
Published: March 2013

Accidents of icing on catenary have great impacts on normal operation of trains. An on-line anti-icing technology used static var generator (SVG) for catenary was proposed, which can prevent icing formation without interrupting trains normal operation. The heat balance equations for catenary were solved, whose results were compared with data provided by TB/T 3111 and testing show the equation was correct. The simulation model based on Matlab was bulit , whose results and analysis show the correctness of the method.
Sound Transmission through Lightweight Metallic Plate by Fourier Transform Method
Authors: Jin Ye Qing , Pang Fu Zhen , Tang Dong , Xie Xiao Zhong
Published: March 2013

A theoretical model is developed to investigate sound transmission characteristics of an infinite lightweight plate line connected to equally spaced stiffeners and excited by an oblique plane wave. The reactive forces and moments at the line connections are obtained from the flexural and torsional motions of the stiffeners. The vibro-acoustic equation that describes the dynamic response of the structure is derived by employing the Fourier Transform method, which will be numerically solved by truncating the solution to converge. Numerical examples are presented to investigate the effects of the incidence angle, the stiffener spacing, the plate thickness, on the sound transmission characteristic of the system, and useful conclusions are drawn.
The Application of Circular Magnetic Grid Sensor in Automatic Viscometer for Measuring Viscosity of Liquid Material Based on Fluid Mechanics
Authors: Zhao Jian Gang , Deng Ming , Wang Qi , Yang Rui
Published: March 2013

Viscometer is analysis instrument which is available in measuring viscosity of liquid material. The viscometer is widely used in food, inks, paints, solvents, petroleum products and various fields of industrial production. In the field of oil drilling, viscometer is mainly used for evaluation rheological parameter of drilling fluid that is beneficial to safety, fast and scientific drilling. Circular magnetic grid could improve precision and stability when it is applied in torque measurement of automatic viscometer, and its non-contact measurement and high antipollution characteristics meet the design requirements of viscometer. The improved automatic viscometer has strong stability, good consistency and automatic reading function. According to needs of users, it would automatically draw various rheological curves.
Influencing Factors of Self-Stressed Concrete Filled Steel Tube with Segments Bearing Capacity
Authors: Wang Shi Liang , Yi Li Yun
Published: March 2013

According to the unified theory of general concrete filled steel tube, this paper puts forward a constitutive relationship model of the self-stressed concrete filled steel tube, which was verified by experiments and finite element methods. On the basis of the above, the influences of the bearing capacity of self-stressed CFST members were analyzed about the strength grades and magnitudes of self-stress of confined concrete. The results show that the bearing capacity of the self-stressed concrete filled steel tube members will be improved with the increase of the magnitudes of self-stress and concrete strength grades. Compared to the general CFST in same conditions, the maximum extent of the bearing capacity can be approximately enhanced 20%.
The Research of Electrochemical Behavior of Alloy AA5083 in 3.5% NaCl Solution
Authors: Chen Shan , Li Guo Ming , Chang Wan Shun , Chen Xue Qun
Published: March 2013

The effect of scanning rate on the AA 5083 electrochemical behavior in 3.5% NaCl solution has been investigated using measurements of potentiodynamic polarization and cyclic polarization experiment. The results showed that when the scanning rate was in the range of 0.2mV/s to 5.0mV/s, the influence on the potential of pitting Epit was small, thus the scanning rate 0.5mV/s was selected. The pitting originated from intermetallic inclusions Mg2Si and resulted in corrosion of aluminium matrix adjacent to the inclusions. Experiment revealed that decrease in the chloride concentration slightly shifted both the pitting Epit and corrosion potentials Ecorr to more active values. But the effect was changed slight when the chloride concentration exceed to 1.0%.
Study on Environmental Materials with the Influence of Soil Carbon of Temperate Forests along an Altitude Gradient
Authors: Tian Qiu Xiang , He Hong Bo , Zhang Xu Dong
Published: March 2013

Forests cover 30% of global land area and maintain 73% of global soil carbon which is important to the global carbon cycle. In forest ecosystem, climate was expected to affect the quality and quantity of environmental materials (detritus) inputs to soil and soil chemical and physical processes which then affected carbon storage technically. Thus, altitude provided a wonderful site for this environmental research. We collected five soils along the altitudinal gradient on the Changbai Mountain in the North Temperate Zone to analyze the soil properties and carbon content. The results showed the highest SOC content was observed at lowest altitude for the larger plants residues (environmental materials). Except the lowest altitude, the amount of SOC increased with altitude for the low decomposition under the cold temperature. Multiple environmental factors (such as soil type, topography and vegetation) were thought to regulate SOC technically.
Research on Methane Hydrate Meta-Stable Property of Gas Hydrates for Application to Natural Gas Storage and Transportation
Authors: Dou Bin , Fan Bin Bin , Ren Lei
Published: March 2013

Gas hydrates are group ice-like crystalline compounds, which form through a combination of water and suitably sized guest molecules under low temperature and high pressure conditions. The important properties of hydrate are very high gas to solid ratio, 1m3 of hydrate may contain up to 175m3 of gas (at standard condition). When the conditions change, the methane hydrate can dissociate to methane and water. Hydrate meta-stable (self-preservation) property has been reported by some researchers in recent years. If we can utilize the property economically in addition to its high-density gas containing property, it is possible to store and transport stranded natural gas at higher temperature and lower pressure compared to the conventional liquid natural gas method. The authors conducted laboratory experiments of methane hydrate dissociation in order to examine its potential for application to natural gas storage and transportation. As the result, relatively extremely slow dissociation was confirmed within temperature range between -7.5°C and -3°C. These results seem to be very promising for practical application of self preservation property to natural gas storage and transportation.
Micromagnetic Simulation of Ferromagnetic Resonance in Nanoparticle with Lateral Gradient Magnetization
Authors: Tang Ke
Published: March 2013

Micromagnetic simulation is performed on a ferromagnetic nanoparticle with lateral gradient magnetization in order to study its resonance modes and magnetizaiton dynamics mechenism under microwave frequency. The ferromagnetic resonance spectra and magnetzation reversal are calculated with dc magnetic field from 0 to 600 mT. The simulations show that an obvious border spin wave resnonace mode arises under a greater magnetic external field, which provide a new method to excite spin wave in magnonics; the hard phase determines the process of dynamical magnetization reversal under microwave frequency, which is different from the static magnetization reversal where the soft phase plays a key role.
Electromagnetic Field Shielding Fabrics with Increased Comfort Properties
Authors: Safarova Veronika , Militky Jiri
Published: March 2013

The expansion of the electronic industry and the extensive use of electronic equipment in communications, computations, automations, biomedicine, space, and other purposes have led to problems such as electromagnetic interference of electronic devices and health issues. For reasons given above, a demand for protection of human being, sensitive electronic and electrotechnic appliances against undesirable influence electromagnetic signals and troublesome charges raised. This paper presents the present state of a fabrication and characterization of multifunctional metal hybrid fabrics with increased resistivity to electromagnetic smog at conserving basic properties of textile structures designated for clothing purposes. The parameters influencing electromagnetic (EM) shielding properties of the hybrid fabrics were investigated. It was shown that the EM shielding effectiveness of the fabrics could be tailored by modifying the metal content, metal grid size and geometry. Furthermore, correlation between electrical properties and EM shielding effectiveness and comfort properties was studied.
Numerical Simulation on Forming Behavior of Magnesium Alloy at Elevated Temperatures with Experimental Verification
Authors: Chan L.C. , Lu X.Z.
Published: March 2013

This study aimed to predict the formability of AZ31B alloy sheets at elevated temperatures by combining the experimental test with numerical simulation. Forming limit tests were performed to obtain the FLDs of the AZ31B alloy sheet at elevated temperatures of 250 °C and 300 °C. Numerical simulations of warm stamping for a camera case were established based on the forming test results. Furthermore, warm stamping experiments for the camera case were performed to validate the correction of the simulated results. The numerical results show a good agreement with the experimental observations.
FTIR and WAXD Study of Regenerated Silk Fibroin
Authors: Kamalha Edwin , Zheng Yuan Sheng , Zeng Yong Chun , Fredrick Mutua N.
Published: March 2013

In this study, regenerated Bombyx Mori (B. Mori ) silk fibroin from two aqueous solvents was analyzed for structural deviations. Results from Fourier transform infrared spectroscopy (FTIR) and Wide angle x-ray diffraction (WAXD) implied great alteration in the secondary structure, crystallinity and molecular weight due to the regeneration process.
Modeling and Simulation Research of Banded Wedge and Synchronous V Belt Drive
Authors: Wu Ying , Zhou Xu
Published: March 2013

For cutting down the stress and displacement of banded wedge and synchronous V belt drive in the transmission process, promoting the transmission mechanism, and improving quality of the belt drive, the working principle of the transmission mechanism was introduced briefly. The three dimensional solid model of the transmission mechanism constituted in pro/e; the main parameters of the model were set using ANSYS Workbench. And then the serialization simulation analysis of the transmission mechanism was achieved when the tension force is located in the point of the V belt entering meshing with the driven wheel; the cloud diagram of Von Mises stress and the maximal Von Mises stress and total deformation of the transmission mechanism were elicited. The simulation results were analyzed. The simulation results show that maximal total deformation has a minimum value with increasing the tensioning force. Reducing becomingly the tensioning force in ensuring natural belt drive the maximal Von Mises stress reduces effectively. Augmenting the active force the maximal equivalent stress rarely reduces and the maximal total deformation remains unchanged. Adjusting opportunely the location of the tensioning force the total deformation reduces effectively and the maximum equivalent stress changes smaller.
An Adaptive Element-Free Galerkin Method Based on the Strain Energy Density
Authors: Du Yi Xian , Hu Jin Run , Zhang Yi
Published: March 2013

In practical study, an adaptive procedure based on the gradient of the strain energy density is developed for element-free Galerkin method using moving least-squares (MLS) approximation and global Galerkin formulation require a background mesh for domain integration. It comprises nodal strain energy density and a local domain refinement technique. The numerical experiments in this paper show that this adaptive element-free Galerkin method is simple, effective and efficient.
Analysis of Foundation Influence Caused by Mechanical Vibration
Authors: Kuang Hao Wei , Bai Yu , Zhou Li Chao , Zhang Xiang Ping , Zhao Xiao Li
Published: March 2013

In order to study excessive foundation vibration produced by mechanical vibration, this paper firstly deduce displacement amplitude formula based on dynamics theory and a simplified 2DOF model consisting of machine and foundation underneath. Functional expression of dynamic magnification factor D and frequency ratio is put forward by assuming stiffness ratio and mass ratio of machine and foundation. Then compared with function graphs under different suppositions, we know how to roughly assess foundation influence produced by mechanical vibration and how to roughly design machine which make foundation be unaffected.
Alternative Layouts for Air Distribution Improvement of a Computing Data Center
Authors: Wang F.J. , Lai C.M. , Huang Y.S. , Huang J.S.
Published: March 2013

In this study, numerical simulation by using computational fluid dynamics (CFD) codes were conducted to investigate the influence of alternative layouts for air distribution in a full scale newly constructed data center. Through the simulation of different airflow distribution patterns in the data center, the optimum practice for cooling airflow arrangement can be identified easily. The simulation results also revealed that the best practice with a vertical under floor cooling architecture can provide satisfactory airflow distribution and thermal management. Higher cooling performance can be achieved by providing better separation of cold and hot aisle stream. Rack cooling index (RCI) has been used to evaluate the cooling performance of environmental conditions for the data center facility. Numerical study through CFD simulation can not only identify the best practice for airflow distribution, but also provide the energy-efficient and cost-effective HVAC system specific for data center facility.
Coefficients of Local Head Losses in Steady-State Flow of Throttled Surge Tanks with Standpipe by CFD
Authors: An Jian Feng , Zhang Jian , Cheng Sheng
Published: March 2013

This study investigates the steady-state flow pattern of throttled surge tanks with standpipe, especially the coefficients of local head losses. The experiments were carried out, and FLUENT, which solves the Reynolds-averaged Navier-Stokes equations, was applied to experimental data for solving flow fields. The results show the computed and measured local head losses agree closely. The coefficients of the local head losses are linearly proportional to diameter ratio with the slope of 0.037. The anticlockwise backflow region occurs in the standpipe, and it induces inflow into and outflow from the standpipe. For hydraulic engineering projects, the discharge into and out from standpipe does not change with velocity and diameter of main conduit, but are linearly proportional to diameter ratio with the slope of 0.0378.
The CPG Gait Generate Method of the Quadruped Robot Based on Iterative Learning Control Algorithm
Authors: Wang Cheng , Gao Jun Yao , Duan Xing Guang , Liu Yi , Li Xin , Xu Zhe , Sun Wen Tao
Published: March 2013

Based on the quadruped robot, this paper mainly studies the two directions of the content. The first part mainly introduces the mechanical structure design and the construction of the control system of the quadruped robot, completes the prototype design of the quadruped robot based on hydraulic power system. The second part studies the CPG gait generate method of the quadruped robot based on iterative learning control algorithm. From the principle of bionics, firstly, we use the CPG principle to generate gait, and then use the iterative learning control theory to make the control more optimization.
Nonlinear Optical Properties of Biosilicate Nanocomposite Materials
Authors: Proschenko Dmitriy , Golik Sergey , Chekhlenok Alexey , Postnova Irina , Shchipunov Yuri , Kulchin Y.N.
Published: March 2013

The transmission of the femtosecond laser pulses by new biosilicate nanocomposite materials has been experimentally investigated. The strong nonlinear optical properties of these nanocomposite structures have been revealed in spectral characteristics of transmitted ultrashort pulses. The shape of transmitted spectrums through new nanocomposite biomaterials demonstrates major changes indicating the broadening with formation a strong anti Stokes component in the output spectrum with generation of supercontinuum spectra. The carried out studies have showed that the optical nonlinearity of new nanocomposite materials can be regulated by trace amounts of Au or CdS nanoparticles.