bluuebunny/crossref_metadata_2025 huggingface dataset:
Design on Biochemical Indicators Management System for Athletes
Authors: Jia Wen Wei , Chen Heng
Published: October 2014

Biochemical indicators have the role of monitoring for competitive sports level data, the use of biochemical indicators to assess the fitness and health status of athletes, the results is more accurate. In this paper, a system designed to provide technical support for the athletes and biochemical indicators of management systems development. First, choose a representative biochemical indicators, and indicators are described; then, processed the database logical structure design, including athlete information, sample information, biochemical markers, and other related fields; finally, functional design, including data entry, data modification, data query, data reporting, system management and other main function module. Using results of this study can give full play to the role of technology in competitive sports, to achieve scientific training.
Study on Intermolecular Forces of Corn Gluten with the Chemical Reagent Treatment
Authors: Yan Rong , Li Xin Hua , Qi Xiao Jun
Published: October 2014

Corn gluten were steeped with different chemical reagents, 2%urea, 5%tween80, 5% NaCl, 2%L - cysteine, using distilled water as control. Intermolecular forces in corn gluten under different reagents were analyzed using the amount of free starch measuring by iodine calorimetry. By the light microscope, intermolecular structure transformation in corn gluten was analyzed before the treatment and after. The results show that Urea, twain, NaCl, and L-cysteine all can make the starch that closely combined with protein migrate away, in which the effect of L-cysteine and NaCl were better, releasing more free starch. It is found through microscopic observation that the starch granule existing in corn gluten is small granule from cutin endosperm, and microscopic observation results consistent with the free starch results. By analysis of the amount of free starch and the microscopic structure change of corn gluten and the mechanism of measuring intermolecular forces with the chemical reagent, it is demonstrated that disulfide bond and electrostatic attraction were main intermolecular forces in corn gluten, which was the main reason for the search combining with the protein .The effect of intermolecular hydrogen bonds and hydrophobic interaction were weaker.
The Improved Optimal Gradient PV MPPT Control Algorithm
Authors: Gao Zheng Zhong , Zhao Li Na , Bai Xing Zheng , Guo Jin Jian , Wang Li Zhi
Published: October 2014

Against the problem that the existing MPPT control algorithms of PV array have difficulties to balance both of the control accuracy and searching speed, this article presents a golden ratio optimal gradient MPPT algorithm based on the traditional optimal gradient MPPT control algorithm. The algorithm is an optimal gradient control algorithm of variable step size, it has an advantage over the traditional fixed step optimal gradient algorithms on tracking the maximum power point. The experimental results show its superiority in the searching speed and control accuracy by modeling and simulation on PSCAD.
Research of Ultrasonic Horn Based on Composites Machining
Authors: Tao Zhi Yong , Zhang Yun
Published: October 2014

This text passes a kind of research that used for the Ultrasonic Horn that the Composites Machining, according to the calculation of the theories with physically applied medium of experiment contrast, tally up the superior calculate way. choice of the Horn material the Horn clip tight position etc. provide a Technical Support for engineering application.
Research on Power Consumption of Lithium Ion Battery Protection Circuit
Authors: Wang Ying Hai , Zhang Hao Ming , Peh Lian Soon
Published: October 2014

Lithium ion battery, as a new type of energy storage equipment, has small size, large power density, high individual voltage, low rate of self-discharging and small self-resistance etc. It substitutes the traditional power battery in AGV. Since it will disconnect from the electric power system after charging, it only has to rely on the energy left to finish all tasks, research on power consumption of its protection circuit is especially important. Experiments prove that the power consumption of improved protection board could be reduced by around 50%, efficiently improves the performance of lithium ion battery protection circuit.
The Design and Practice of Process Level Network in Smart Substation
Authors: Wang Jin , Zhang Hu Yin , Zheng Xian Rui
Published: October 2014

Currently, VLAN technology in engineering practice of smart substation has become mature, but due to the limitation of device support and simulation technology, the system implementation scheme based on GMRP has few mature case studies can be carried out. Through the study of IEC61850 standard, the special simulation system of substation simulation based on discrete event simulation technique is designed and implemented. Finally, the completed of the simulation of data transmission in smart substation and the simulation analysis based on GMRP, proves that the use of GMRP protocols in data transmission is feasible.
Effect of a Single Overload on the Fracture Behavior in Safe-End Dissimilar Metal Welded Joints in Nuclear Power Plant
Authors: Xue He , Gui Yuan Kui , Wang Wei Bing , Li Xiao Bo , Wang Ying Ru , Tao Xiao Qing , Guo Rui
Published: October 2014

To understand the effect of a single overload on the fracture behavior in welded joints, the stress and strain field at the crack tip in a safe-end dissimilar metal welded joint in nuclear pressure vessel is simulated and analyzed by using the elastic-plastic finite element method in the paper, in which the mechanical heterogeneity in welded joint is emphatically considered. The investigating results indicate that the tensile plastic strain at crack tip increases, but the tensile stress decreases as a single overload increases, and the influence of a single overload on tensile strain is larger than one on tensile stress, which provide a theoretical basis for quantitatively estimating the crack growth rate of environmentally assisted cracking in the welded structural material of pressure vessel and piping in the nuclear power plant.
The Optimization for Management Model of Directly Transfer User in Regional Power Grid
Authors: Yuan Li Li , Liu Lin
Published: October 2014

This paper analyzes the direct transfer of user management problems in the existing schedule management, analysis how to optimize the current large regional power grid management model for the user’s scheduling, establish the effective management of large user scheduling system.
The Analysis of One Protection Action Caused by 110kV Line Break Fault
Authors: Chang Yan Li , Chen Yan Ping
Published: October 2014

Combined with the 110KV line breaking protection action, this paper pointed out the main problems is that the switch of 110KV side is not disconnected. It leaded to protection action of T type transformer in 110KV line. Because of the problem in switch operating of 110KV line, the three phases are not disconnecting all. It caused insulation damage of the 110KV main transformer that the 110KV line is non-phase, and then it caused tripping main transformer protection. This paper proposes improvement measures and precautions for such situations.
Study and Application of Electronic Technology in Automobile Brake System
Authors: Mo Xiao Ling
Published: October 2014

Vehicle braking system in vehicle security plays an important role.In recent years, with the progress of vehicle technology and improvement of the car speed, the rapid development of electronic technology provides a more broad space of development to the braking system. Based on the use of electronic technology in automobile braking system present situation as the research object, the application of electronic technology in automobile braking system has carried on the detailed exploration and research, to promote the further study of electronic technology in automobile braking system and the application.
A Bandgap Reference with High Order Temperature Compensation
Authors: Ye Rong Ke , Hu Rong Bin
Published: October 2014

A kind of CMOS bandgap reference circuit with high order temperature compensation is introduced [1]. Compared to the traditional circuit, the bandgap reference proposed here has several advantages such as better temperature stability, smaller chip area, lower power consumption, self-power-on, and so on. Our design can be used in analog-to-digital or digital-to-analog converters, where high performance bandgap reference is required.
Design of Isolated Flyback LED Driver Based on LYT4326E
Authors: Cai Hong Zhuan , Geng Qing Kai
Published: October 2014

The design of a high efficiency, silicon controlled dimming and power factor correction (PFC) LED drive power supply is proposed.The LED driver power supply uses isolated flyback topology,with high efficiency and power factor,and also has a no-load protection,short circuit protection and overvoltage protection.The power controller chip LYT4326E and working principle of the circuit are analyzed.Experimental results verify that the full load efficiency of the power supply circuit is over 86%,with a high power factor and can run stably and reliably.
Virtual Reactance Implementation Method for Droop-Controlled Three-Phase Microgrid Inverters Using SOGI Scheme
Authors: Gu Jun , Zhang Xing , Li Shan Shou
Published: October 2014

Because the line impedance of low-voltage microgrids is mainly resistive and the transfer impedance of microgrid inverters is usually mismatched, a virtual reactance is usually added to the control loop of each microgrid inverter. It is found that the existing two virtual reactance implementation methods introduce harmonic components into the voltage control units of microgrid inverters in the condition of nonlinear loads after the theory and simulation analyses. To solve the problem, a second-order general-integrator (SOGI) virtual impedance implementation method of droop-controlled three-phase microgrid inverters is proposed. Simulation results are provided to show the feasibility of the proposed method.
Design of an Analog Control Circuit for the Automatic Sun-Tracking PV Bracket System
Authors: Liao Mian , Kong Ling Yun , Ding Hong Liang
Published: October 2014

This paper designed an analog control circuit which can automatically track the sun for PV bracket system to improve the solar cell photo-electricity conversion efficiency. The sunlight intensity can be real-time detected by sampling the short-circuit current of solar cell. The PV bracket system can be automatically adjusted to achieve a final horizontal angle and pitch angle by using the hysteresis comparator and dedicated motor driver chip, which always makes photovoltaic modules toward the sun's position. At the same time, the PV bracket system can be automatically reset by the hall switch when the sun reaches the sunset and the light intensity is less than the reference value. The experimental prototype is used to testify the correctness and reliability of the control system, which has better practicability and value to extend.
A Digital Calibration Method and Circuit for ADCs with a Fold-Interpolation and Pipeline Structure
Authors: Zhang Zheng Ping , Wang Yong Lu , Chen Guang Bing , Wang Jian An , Chen Liang
Published: October 2014

A structure of ADCs which combines fold-interpolation and pipeline is introduced, as well as corresponding digital calibration method. The simulation shows that the performances of the ADC after calibration are improved a lot. The SFDR achieves 62dB at a sampling rate of 800MHz, when the input analog signal is at 397MHz.
Simulation Research of External Data Reading Technology Based Arc Furnace Reactive Compensation
Authors: Zhou Yu Tian , Wang Shu Han , Li Jun Ming , Yu Xin , Chen Jia Yong , Wu Si Cong
Published: October 2014

The arc furnace is a common load in smelting industry. Due to special structure, it often generates great impact on the grid. It has become a recognized technical means to use dynamic reactive compensation device SVC to eliminate the adverse impacts on grid power quality during arc furnace production. However, the electrical system of some arc furnace load containing sites is complex. Limited by the site condition in which sound commissioning environment cannot be provided for SVC, relevant control parameters can only be configured on the basis of experience, which leads to poor compensation effect, and thus affecting normal production of the user.
Research on Critical SVG Technology for Low Voltage High Power Load
Authors: Ye Li Jun , Wang Shu Han , Yu Xiao Chen , Hu Yu Tao , Wang Jian
Published: October 2014

impact loads, such as submerged arc furnace, are often used in the smelting industry, their features include high power, low voltage, high current, rated power is from several MVA to tens of MVA, rated voltage is less than 200V. Reactive and harmonic compensation scheme for such load is generally centralized compensation on high voltage side of the power grid, facts have proved that, the effect of such compensation mode is not satisfactory to customers. Therefore, people have designed a special low voltage high power SVG, which is installed on the low voltage side for compensation, it could perform reactive power compensation, and filter out harmonic, protect against grid voltage fluctuation and flicker caused by submerged arc furnace in different production periods effectively.Compared with common SVG project, how to guarantee safe and stable operation of the equipment under high current conditions is critical technical issue in the design. This paper takes an example of an actual project, designs water-cooled copper pipe bus as connecting bus of low voltage high power SVG. Rationality and feasibility of this design has been proved in actual equipment operation.
The Protection System Design of Leakage, Undervoltage and Overvoltage for Electromagnetic Starter in Coal Mine
Authors: Ma Hong Wei , Xing Wang , Mao Qing Hua , Liu Yu
Published: October 2014

For the problem of leakage, undervoltage and overvoltage fault protection of electromagnetic starter with supply voltage of 660 V and rated current of 200A, a leakage, undervoltage and overvoltage protective system based on PLC LM3108K was designed. This system uses voltage transformer to detect three-phase AC voltage. It protects undervoltage and overvoltage fault by judging effective value of three-phase voltage, protects leakage fault of main switch for electromagnetic starter by additional DC power and protects leakage fault of branch switch by using zero-sequence power direction. This system has good protection functions for leakage, overvoltage and undervoltage faults of electromagnetic starter in coal mine.
Different Shape Notches Effects on Tearing Del-Zone for Stratospheric Airship Envelope Material
Authors: Cao Shuai , Gu Yun Chao , Meng Jun Hui , Lv Ming Yun
Published: October 2014

Stratosphere airship envelope material is composed of multilayer laminated film material reinforced by fiber. As the same as other film material, it occurs del-zone in the course of crack tearing propagation, which is significant for envelope material mechanic studies. Many researched unlined its application, not it’s forming factors. The paper focus on crack or notch shape effects on the del-zone. Six groups test including specimen with no crack, central crack, square notch, diamond notch, circle notch, and rectangle notch are carried on under the stretching instrument to find the different del-zone phenomenon and get displacement-load curve. Combined with theory, the paper try to explain the del-zone differences for specimens and explore the shape notched sensitivity to specimen. The results shows that different specimen have differences on del-zone, further affecting the specimen module and fracture strength. In turn, it manifests that to some extent, the size del-zone decides fracture stress value, providing advice for airship envelope designing.
Simulation of DC-Side Voltage for Shunt Active Power Filter with Fuzzy PI Controller
Authors: Zhou Kai Jie , Cao Pei Pei
Published: October 2014

Traditional PI control strategy for DC-side Voltage of Active Power Filter is difficult to determine parameters, so a parameter self-setting fuzzy PI controller is proposed. Analyzing the principle of APF revealed that the compensation ability to harmonic current is closely related to the dc-side voltage. In the fuzzy control rules, the deviation and its changing rate of actual current from given current are input variables and the PI parameters can be self-adjusting. MATLAB simulation results show that: the fuzzy PI control strategy for dc link voltage, the dc side voltage is more stable, APF filtering effect is better.
An Improved Bootstrapped Switch
Authors: Zhu Can , Hu Rong Bin
Published: October 2014

For the first time, the capacitive non-linearity is considered and calibrated. Based on the traditional bootstrapped switch, a cell is added to eliminate the first-order capacitive non-linearity. The measurement shows that the sampling and holding circuit using the improved bootstrapped switch can achieve a SFDR of 86dB with respect to 76dB for the traditional one.
DDR Memory Controller Design Based on FPGA
Authors: Wang Shu Hai , Tian Yuan Yuan , Chen Shu Wang
Published: October 2014

With the rapid development of electronic science and computer science, the large scale integrated circuit applied in the military, economic and social life is more and more widely. Because the DDR SDRAM has twice the SDRAM memory data rate, now has been widely used. The DDR memory controller design for the DDR SDRAM and the connection between the FPGA provides a solution [3]. This paper analyzes the current international technology trends and storage controller DDR2 SDRAM controller detailed technical specifications. DDR2 SDRAM controller configuration based on register information units, with automatic initialization, to determine priorities, to generate the DDR2 command sequence, and other functions, also can undertake signal control and data reading and writing.
Research on Static Var Compensator Control System Based on SIMATIC - TDC
Authors: Li Jun Ming , Niu Tao , Si Hong Xiao , Hui Song Shan , Zhou Yu Tian , Wang Shu Han
Published: October 2014

This paper proposes a new static var compensator control system with SIMATIC-TDC as the master controller and DSP as the auxiliary controller. Siemens TDC is a high-end controller with excellent data processing capacity, which can satisfy the current reactive compensation control algorithm to finish open loop and close loop control. Meanwhile, the programming configuration software is also fully featured, and widely applied in smelting, chemical and power industries. However, the auxiliary controller consisting of DSP and CPLD can quickly finish precise processing of signals (such as high-frequency sampling and signal frequency spectrum analysis). The static var compensation control system consisting of the master controller and the auxiliary controller has now been applied in many projects, achieving sound compensation effect.
Study on Analysis and Simulation of Novel Frequency Selective Surfaces
Authors: Yu Yan Xin , Wang Chun Yang , Sun Yan Jun , Jiang Wen Ting
Published: October 2014

Frequency selective surface (FSS) is a two-dimensional periodic structure. It exhibits total reflection and transmission in the neighborhood of the element resonances. As it performs as a filter, FSS is widely used in the fields of microwave and optics. In this paper, the finite element method is used to analysis frequency selective surface and study on the feasibility of Ansoft HFSS software for frequency selective surface simulation. Hexagonal element of frequency selective surface is as an example to explore the simulation method and the process of Ansoft HFSS. Through the comparison of the simulation curves and the measured curves of hexagonal element frequency selective surface film by photoetching technology, the simulation method of Ansoft HFSS software for frequency selective surface is correct. At the same time, this paper further verified the reliability of the simulation through the example of the ring and the cross unit structure.
Comparison of Two Topologies for Off-Grid Home
Authors: Zhang De Gang , Zhang De Hai , Su Shi , Zhou Song , Zhang Wen Bin , Zhang Shao Quan
Published: October 2014

Off-grid systems are proposed for the power shortage in remote areas. In an off-grid home, electronic devices can result in poor power quality issues. In this paper, two topologies of off-grid systems are presented and compared to chose more suitable one for an off-grid home. One compared topology is a system with inverter and transformer, and another one with the converter and inverter. We compared and examined their corresponding current, voltage waveforms, and the THD values based on the same power source and load by the Matlab/Simulink software. The simulation results show that the system with inverter and transformer is more suitable for off-grid home in remote areas.
Research Scheme Design of Copper-Based Chalcogenide Crystal Thin Film Materials for Solar Cells
Authors: Liu Ke Gao , Shi Lu Dan , Xiang Dong
Published: October 2014

The keys for development of copper-based chalcogenide crystal thin film solar cells are to improve efficiency and reduce costs. Oriented growth and band gap grading of its absorption layer crystal film are important ways to improve the efficiency. It proposed controllable preparation of this type thin film by chemical solution deposition and co-reduction, and study on the crystal orientation and regulation of the band gap gradient. It will design the composition and band gap gradient of multi-component and multilayer films, and establish the models for design, theoretical calculation and performance prediction; It will explore the effect of band gap gradient on electrical and optical properties and reveal the effecting laws and mechanism on electrical and optical properties.
The Research of Design Method on Green Modular that Oriented Construction Machinery
Authors: Yang J.R.
Published: October 2014

The aim of this study was to obtain the method of the green design and modular design that oriented construction machinery products. A variety of modern design tools such as the finite element analysis software package and optimize design package and a two-factor evaluation fuzzy modelare used to analyze and Evaluation the green degree and the module degree of the construction machinery. Some modern mathematical tools such as AHP and fuzzy comprehensive evaluation method are used to calculate and evaluate the green degree and the module degree in construction machinery design. The proposed design method can meet the requirements of the green degree and the module degree of the construction machinery.
Research on Algorithm for Space Weld Reconstruction and Torch Pose Simulation
Authors: Yang Peng , Hui Dong Xing , Kai Zheng , Tian Li Shu
Published: October 2014

A path planning algorithm based on B-spline interpolation techniques was constructed for automatic welding system.The system used a B-spline curve to reconstruct the weld,it was achieved by reversing the control points of B-spline curve through the prescribed date points. The weld posture model was then obtained from the osculating plane and normal plane of B-spline curve. By taking a series coordinate transformation to the weld posture model, the torch posture model based on control terminal was provided.Experiments show that the new algorithm can readily be used for various three-dimensional welding tasks.
Reliability Optimization Design of Automobile Propeller Shaft
Authors: Li Yong Xian , Zhang Wen Qiong , Chen Song Ping
Published: October 2014

Large sag due to heavy weight of the propeller shaft is a major cause of rotating vibration, so that to use the hollow shaft is an effective way to reduce the weight. Many scholars and engineers ignored that the outer and inner diameter are discrete and integer variables in optimization design of the propeller shaft. The practicability of an optimal solution is affected by decimal value of the diameter. A practical reliability optimization model with discrete and integer variable of the propeller shaft is proposed, and “Solver” in Microsoft Excel is used to seek the solution of optimization design. The reliability optimization model is composed of minimum weight objective function and constraint conditions such as torsional strength reliability, torsional stiffness reliability, critical speed, torsional stability, manufacturing process, etc. Design results show that the reliability optimization model with integer and variable of propeller shaft and the solving method with “Solver” in Microsoft Excel are more reliable and efficient.
Effect of Controlling of Different Crystallography Form of Hematite on the Oxidation of Phenol by Fenton-Like Reagent
Authors: Guo Xing Fei , Zhang Hong Wei , Ma Cong , Han Xu , Chen Yu Zhi , Wang Jing Chen
Published: October 2014

In order to study hematite of different crystallography form with hydrogen peroxide to form various kinds of Fenton-like reagent in the process of phenol removal, we discuss the effect of different shapes, particle sizes and some other factors on the degradation of phenol in the process of catalysis. This article studies the synthesis of Fenton-like reagent with hematite and its role in the process of catalysis of phenol to find the most suitable crystallography form.
Failure Analysis of Automotive Differential Based on the Fault Tree
Authors: Pan Ya Wei , Yu Quan Yu , Wang Fei
Published: October 2014

The paper analyzes a variety of reasons differential fault automobile differential and establishes the corresponding fault tree by using Fault Tree Analysis of reliability theory. The failure spectrum of automobile differential is constructed through qualitative analysis of the fault tree. Meanwhile the study gives the theoretical methods about the solving of top event’s probability and bottom event’s importance for design, fault diagnosis and repair of automobile differential.
The Design and Development of the Cutting Plan Optimization System
Authors: Wang Xiao Yun , Shi Yu Xi
Published: October 2014

In clothing customization manufacture, cutting schemes are worked out mostly based on manual experience. This not only wastes extra time and workforce, but also induces mistakes, especially for various orders in business wear customization industry. The cutting plan optimization system designed by our paper realizes the function of the automatic and interactive production of cutting plan. The system’s application reduces the cost and the sub-bed error, improves the efficiency and optimizes the management.
Influence of Nitrogen Partial Pressure on the Microstructure and Properties of TiN Coatings
Authors: Xie Shi Fang , Liu Ke Ming , Ke Pei Ling , Zhang Dong , Wei Shi Yong , Wang Ai Ying
Published: October 2014

TiN coatings were prepared by using multi-arc ion plating technique at different N2 partial pressures. The surface morphology of the coatings was characterized by using a tabletop scanning electron microscope. The cross-sectional microstructure was investigated by using a field emission scanning electron microscope. The phase composition was evaluated by using an X-Ray diffractometer. The hardness and cohesion were measured by using a nanoindentation tester and a scratch instrument, respectively. The results show that the number and size of macro-particles decrease and the compactness of TiN coating increases with the increase of the N2 partial pressure. The hardness and cohesion of the coating increase gradually with increasing N2 partial pressures and reach a peak at 0.6 Pa; then the hardness and cohesion are significantly lower at higher N2 partial pressures.
The Analysis of Electro-Hydraulic Valve Performance Based on AMESim Software
Authors: Chen Wei Yang , Cao Lian Min
Published: October 2014

The paper simulate electro-hydraulic valve hydraulic system through the study on hydraulic simulation research, research the response of accuracy and stability, using AMESim software build electro-hydraulic valve model, simulate the actual working conditions of the electro-hydraulic valve and column hydraulic system simulation, verify the correctness of dynamic simulation results. Reference simulation results,we present programs to improve electro-hydraulic valve to improve its stability. AMESim software has good dynamic simulation performance and simulation accuracy, which provides a new research idea for overall dynamic performances accurate analysis of the filling hydraulic support system.
Numerical Simulation of Two Phase Change Materials Melting Process
Authors: Zhang Bo Bo , Xing Yu Ming , Sheng Qiang
Published: October 2014

Phase change thermal control technology has gained increasing focus as an emerging technology for the thermal control of spacecraft. This literature focused on melting process inside a latent heat energy storage filled with phase change material (PCM) by numerical simulation. A matrix-based enthalpy porosity theory in a three-dimensional finite volume discretization is simulated. The temperature distribution during the melting process of PCM Cerrolow-136 and CH3COONa·3H2O is obtained, based on which the thermal control function and energy storage capacity is compared. The results show that Cerrolow-136 has better performance. In different states of phase change, the temperature distribution of Cerrolow-136 is fairly uniform. Thermal control face's temperature of Cerrolow-136 is closer to phase transition temperature. In the same heat flux of 3000 W/m2, The whole process of thermal control temperature getting to 80°C for Cerrolow-136 is longer. Cerrolow-136, for its excellent characteristics, has potentially broad application in the fields of latent heat energy storage and space vehicle electronics.
3D Finite Element Simulation of Cutting Process Using Surface Micro-Textured Cutting Tool
Authors: Yang Hao Kai , Tu Yu Yang
Published: October 2014

Surface texturing has become a technique to reduce friction and wear in cutting process; laser surface texturing is a method used to create micro-dimples on the interface surface. It is considered that cutting of titanium is difficult. As the experiments are costly and time demanding, metal cutting modeling provides an alternative way for better understanding of machining processes under different cutting conditions. In this paper a 3D finite element model has been used to simulate the cutting process of titanium alloy Ti6Al4V to predict the cutting forces and temperatures.
Effects of Inlet Location on Inert Replacement Efficiency of the Gasoline Vapor in Oil Tank
Authors: Zhou Jian Zhong , Zhang Pei Li , Wu Lin Chuan , Lei Xiao Long , Ma Jian Ke , Wei Zhou Xu
Published: October 2014

Elimination gasoline vapor in oil tank by mechanical ventilation has disadvantages of long vent time poor safety, and low efficiency, however, those shortcomings can be better conquered if combusted gas is used in the process of the mechanical ventilation. Based on former studies, the research on the effects of inlet location on gasoline vapor’s inert replacement in oil tank by combusted inert gas is studied experimentally in this paper. The conclusions in this paper can provide some useful guidance for the field project of gasoline vapor’s inert replacement in oil tank.
A Study on the Extending Life for Bearings
Authors: Zhang Qian , Du Gui Tao
Published: October 2014

Nature works hard to destroy bearings, but their chances of survival can be improved by following a few simple guidelines. Extreme neglect in a bearing leads to overheating and possibly seizure or, at worst, an explosion. But even a failed bearing leaves clues as to what went wrong. After a little detective work, action can be taken to avoid a repeat performance.
Nonlinear Iterative Learning Control of Travelling Wave Ultrasonic Motor
Authors: Liu Yu
Published: October 2014

The relatively simple control strategy can decrease the complexity of the ultrasonic motor system and increase the cost performance. The nonlinear iterative learning control algorithm is simple, the control parameters can be determined according to little experimental knowledge. According to the control characteristics of ultrasonic motor, the nonlinear iterative learning control algorithm is improved and the nonlinear iterative learning control strategy of motor’s speed is designed. Experiments show that the motor system has good iterative learning capacity, the control effect is improved generally in the repeated learning process and the control strategy is simple and effective.
Design of Temperature Control System of Electric Boiler
Authors: Yu Yan Xin , Wang Chun Yang , Sun Rong Chun
Published: October 2014

The electric boiler as object controlloed has the characteristics of nonlinear, time-varying and large lag, and the temperature control system of it has been a challenge. In order to improve the control performance, a novel temperature control system was designed. The system consists of temperature controller, temperature acquisition, temperature display, serial communication, and warning circuit. The core controller was relized by DSP 2407, which can execute advanced control algorithm. A hybird control algorithm was presented, which mergeed PID and fuzzy control. Simulation experiment of PID and presented algorithms were carried on respectively, and the simulation results showed that the system designed has good dynamic and still performance. Furthermore, the system is simple and has a certain application value.
Temperature Influence on the Viscoelastic Electromechanical Deformation of Dielectric Elastomer
Authors: Sheng Jun Jie , Zhang Yu Qing , Li Shu Yong , Chen Hua Ling
Published: October 2014

Temperature can significantly affect the performance of a viscoelastic dielectric elastomer (DE). In the current study, we use a thermodynamic model to characterize the influence of temperature on the viscoelastic electromechanical response undergoing a constant electric load by taking into account the temperature dependent elastic modus and dielectric constant. Due to the significant viscoelasticity in the dielectric elastomer, DE membrane creeps in time and the inelastic stretch of DE is smaller than that of the total stretch. The results show that the total stretch of the viscoelastic electromechanical deformation increases with the increasing temperature until suffering electromechanical instability at a high temperature; the actuation performance is dominated by the moduli of the elastomer. This may be used to guide the design of dielectric elastomer actuators undergoing temperature variation.
Dielectric Strength of Flame-Retardant Reinforced Polyamides at High Temperature
Authors: Rapeaux Michel
Published: October 2014

The dielectric strength of halogen-free glass-reinforced polyamides, including PA6, PA66, PA66/6T and PPA has been evaluated in severe conditions i.e. 120°C and 140°C according to IEC60243-1. A few halogenated grades have been evaluated as well for comparison purposes. The influence of the type of flame retardant is discussed, and results in terms of dielectric strength retention at high temperature are compared with electrical Relative Thermal Index RTI and the compound melting temperature.
A 1D Analysis of Nano Multiferroic Composites for the Novel Read Head Technology
Authors: Choowitsakunlert Salinee , Satitchantrakul Thanatcha , Silapunt Rardchawadee
Published: October 2014

The magnetoelectric (ME) effect induced in a multiferroic composite is potentially a key to improve the performance of the nanoread head in the future magnetic recording device. In this paper, the analysis of the 1-dimensional (1D) L-T mode model containing sandwiched structures of Terfenol-D/Lead zirconate titanate (PZT)/Terfenol-D nanomultiferroic composites is performed. The magnetostriction process is described using the 1D standard square law. The magnetoelectric coupling is then investigated. The piezoelectric response on the applied dc magnetic field and PZT to Terfenol-D thickness (tp:tm) ratio, is determined. The optimal electric field and potential across the PZT layer are achieved at 1.3:1 thickness ratio. The result agrees well with the associated magnetic field-induced strain profile. The peak ME coefficient is found at 1.37:1 thickness ratio.
First-Principle Studies on the Stability of AlN(0001)/NbB2(0001) Interface
Authors: Zhao Hui , Liu Kai Yuan , Han Qian
Published: October 2014

The stability behaviour of AlN(0001)/NbB2(0001) interface was calculated by first-principle total-energy density functional theory. The calculation indicated that the stable NbB2(0001) surface is B terminated. We joined the AlN(0001) slab and the NbB2(0001) slab with different terminations together to construct all possible AlN(0001)/NbB2(0001) interface models, and calculated their interface energies to confirm the relatively stable model. We concluded that the structure with Al is on top of B in the interface AlN (0001)/NbB2(0001) is the most stable configuration.
Influence of the Surfaces Characteristics on the Luminescent Property of Porous Silicon
Authors: Ding Yan Li , Zhao Yue , Feng Yue , Liang Xiao Yan , Wang Lin Jun , Min Jia Hua , Shi Wei Min
Published: October 2014

Photoluminescence of porous silicon (PS) prepared by different etched time was studied. The photoluminescence might originate from the recombination of carriers and surface states, which was proved by FTIR, Raman spectroscopy and SEM. Furthermore, the hydrogen-related groups on the PS surface could eliminate the surface states for the blue emission, but the quantities of surface states for the green emission were depended on the uncovered area on the PS surface. Moreover, the shape of photoconductivity curve was depended on the quantities of the surface states, which also was related to the uncovered area on the PS surface. In addition, the results of the microwave-detected photoconductivity decay measurement indicated thatthe defects on the PS surface increased with the increase of the etched time, which would be related to the increase of the depth of pores.
VUV-Photoluminescence Properties of (Gd, La)2O2CO3: Eu3+
Authors: Wang Zhi Long , Wang Shi Qin , Yao Nin , Wei Xing Min
Published: October 2014

(Gd,La)2-x O2CO3:Eux3+(0.01 ≤x≤0.04) were synthesized via a flux method at 400°C, and their photoluminescence properties under vacuum ultraviolet (VUV) excitation were examined. The excitation spectra showed two bands in the region from 125 nm to 300 nm, the first band centered at 190 nm was ascribed to absorption of related CO32- complex, and the second broad band centered at 246nm and 278nm in Gd2O2CO3:Eu3+ was ascribed to the charge transfer band of O2-→ Eu3+. Series samples exhibited red emission at around 611 nm under vacuum ultraviolet excitation corresponding to the 5D0→ 7F2.transition of Eu3+.
Crystal Structure, Optical Properties of Molecular Crystals 1, 3-propanediol Bis(4-aminobenzoate)
Authors: Xue Rui Ting , Sun Wei Song , Yu Si Rong
Published: October 2014

The crystal structure of 1, 3-propanediol bis (4-aminobenzoate) has been determined by single crystal X-ray diffraction. The UV-vis spectra have been characterized experimentally. The nonlinear optical properties were investigated with the density functional theory method. The calculated first hyperpolarizability values are 7.69×10-30, 14.22×10-30 and 26.66×10-30 esu for the monomer, dimmer and trimer structure of the compound. The results show that the compound has high hyperpolarizability and the hyperpolarizability multipled along with the increasing number of the molecules.
Effects of Compatibilizer on the Properties of Polyoxymethylene/Acrylonitrile-Butadiene-Styrene Blends
Authors: Wacharawichanant Sirirat , Amorncharoen Parida , Wannasirichoke Ratiwan
Published: October 2014

The effects of styrene-co-maleic anhydride (SMA) compatibilizer on the mechanical thermal and morphological properties of polyoxymethylene (POM)/acrylonitrile-butadiene-styrene (ABS) blends were inverstigated. POM/ABS blends without and with SMA compatibilizer were prepared by an internal mixer and molded by compression molding. It was found that the dispersion of ABS phase and compatibility could not improve by using SMA compatibilizer in POM/ABS blends due to SMA can be miscible with ABS phase more than POM phase. The addition of ABS in a range of 10-30 wt% could improve the Young’s modulus of POM. Impact strength, tensile strength and percent strain at break of POM/ABS blends decreased with increasing ABS content. The addition of compatibilizer improved Young’s modulus of POM/ABS (60/40, 50/50) blends. The addition of ABS increased the degradation temperature of POM, while SMA compatibilizer did not improve the degradation of POM/ABS blends.
Simultaneous Improvement of Mechanical Properties and Thermal Stability of Polyurethane by Polyethylene Glycol Grafted Cellulose Nanocrystals
Authors: Dou Zhen Jun , Cheng Miao , Qin Yun Feng , Chen Long , Qin Zong Yi
Published: October 2014

A study of the effect of the addition of polyethylene glycol grafted cellulose nanocrystals on the properties of a polyurethane matrix was carried out. The resulting nanocomposite films were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, micro–control electronic universal testing machine and thermal gravimetric analysis. Remarkable improvements in the mechanical and thermal properties of polyurethane could be attributed to well–dispersion of nanofillers in polyurethane matrix and the formation of hydrogen bonding network within the polymer matrix.
Study on Short Basalt Fiber Reinforced Fluorine Rubber Composites
Authors: Wu Wei Li , Feng Hai Hong
Published: October 2014

Fluorine rubber has excellent performance, such as cold resistance, heat resistance, ozone resistance thermal properties and so on. However, fluorine rubber is poor in the mechanical properties. In order to improve its availability of fluorine rubber, short basalt fiber/ fluorine rubber composite materials were prepared by using short basalt fiber as reinforcement, and its mechanical properties and compatibility were studied. The influence of the surface treatment on short basalt fibers, short basalt fiber content on the mechanical properties of short basalt fiber reinforced fluorine rubber composites were studied. The best formulation of short basalt fiber/ fluorine rubber composite materials were determined by testing Shore A hardness, tensile strength and elongation at break. The results show that the formula obtained best mechanical properties is 100 phr fluorine rubber, 10 phr short basalt fiber, and 2.5 phr KH-550. And further demonstrate that compatibility of short basalt fiber / fluorine rubber with KH550 is best by SEM and IR analysis. And prepare excellent performance of fluorine rubber composite materials.
Component, Mobility and Specific Surface Area of Urinary Crystallites with Different Sizes in Urine of Healthy Human and Lithogenic Patients
Authors: Gan Qiong Zhi , Wen Xiao Ling , Xue Jun Fa , Ouyang Jian Ming
Published: October 2014

The property difference of urine crystallites with different sizes in the urines of calcium oxalate (CaOx) calculi patients and healthy controls was comparatively investigated. Nanoparticle size analyzer was used to study the mobility of urine crystallites. Fast Fourier transformation (FFT) and and energy dispersive X-ray spectroscopy (EDS) was performed to detect the components of urinary crystallites. The specific surface area (Sg) of nanoscale urinary crystallites is greater than that of micron-grade urinary crystals. The mobility of the controls was more negative than that of the calculi patients. The effect of particle size on mobility was greater than that of the charges on surface of the particles. The amount of small-sized urine crystallites in the healthy subjects was significantly higher than that of the patients. However, the number of large micron-scale crystals in the controls was reduced remarkably. These results showed that the formation of CaOx calculi was closely related to the presence of UA and calcium phosphate crystallites in urine. The urinary system of calculi patients is unstable and very susceptible to urine crystallite aggregation.
Clean Steam from a Plate-Type Exchanger of a Steam Generator for Medical Facilities
Authors: Kubín Milan , Hirš Jiří
Published: October 2014

Medical facilities and similar types of medical centres providing surgical or ambulant care are nowadays unable to manage without a strict hygienic sterilization of medical instruments. The clean steam, necessary for the requested sterilizations, must meet the requirements of European Standard EN 285 and that is particularly from the point of quality, pressure and requested volume in random time period. Production of clean steam is technically and financially very demanding. This contribution is aimed on newly developed Pure Steam system with STEAMEX clean steam generator.
Antimicrobial Activity of Type III Dental Gypsum Incorporated with 3-iodo-2-propynyl-butylcarbamate and its Physical Properties
Authors: Thaweboon Sroisiri , Nisalak Passiri , Thaweboon Boonyanit , Sawaengkit Pornrachanee , Saksit Plang Ngern , Kaypetch Rattiporn
Published: October 2014

Dental impressions have been considered to be potential sources of microbial contamination from patients’ blood and saliva to dental personnel and prostheses fabricated on gypsum casts. Thus, the development of dental gypsum with antimicrobial activity to reduce cross-contamination between patients and laboratory personnel is needed. This study aims to evaluate the influence of incorporation of 3-iodo-2-propynyl-butylcarbamate (IPBC) into type III dental gypsum on its antimicrobial activities and physical properties such as dry compressive strength and setting time. Type III dental gypsum (The Siam Moulding Plaster Co., Ltd, Thailand) incorporated with 3 concentrations of IPBC (0.01%, 0.005% and 0.001% w/w) was tested compared with the control, gypsum without disinfectant. Microorganisms tested were Staphylococcus aureus ATCC 6538, Pseudomonas aeruginosa ATCC 27853 and Candida albicans ATCC 1023. One hundred μL of each microbial suspension (108 CFU/mL) was dropped on hydrocolloid impression (Jeltrate; Caulk/Dentsply, Milford, DE) and left dry. All types of gypsum mixes were prepared and poured into the impressions and allowed to set for 60 min. Then the gypsum samples were removed and the microbial contact surfaces were imprinted on Brain Heart Infusion agar plates. After incubation, colonies appeared on agar were gram-stained and counted. The dry compressive strength and setting time were tested in accordance with International Standard (ISO) 6873: 1998 (E). Dental gypsum containing IPBC showed antimicrobial activity against all tested microorganisms with the percentage of microbial reduction ranging from 19.4% to 70.6%. Among all types of dental gypsum, no significant differences in dry compressive strength and setting time were observed. The newly developed type III dental gypsum incorporated with IPBC had antimicrobial effects against all tested microorganisms. The physical properties of the modified dental gypsum were within the ISO standards. However, further investigation on other properties such as dimensional stability, detail reproduction and clinical usage are still needed.
Preparation and Antibacterial Effect of Nanopalygorskite Supported Nano-Silver Powder
Authors: Wang Jian Rong , Liu Ya Li , Liu Bin , Wu Yan Ping
Published: October 2014

A novel method was used to make palygorskite supported nano-silver powder at room temperature. XRD result showed the presence of silver in the final product. TEM investigation revealed that nano-sliver particles of 6-10 nm in diameter were successfully attached on surface of palygorskite fiber. FTIR was also used to clarify the formation mechanism of our method. The antibacterial effect of palygorskite supported nano-silver powder was investigated. Palygorskite supported nano-silver powder had good antibacterial activity on standard Escherichia coli and Staphylococcus aureus.