bluuebunny/crossref_metadata_2025 huggingface dataset:
Fuzzy Evaluation Method in the Application of the Engineering Bidding
Authors: Wang Wei Ran , Sai Yun Xiu , Fang Xing
Published: September 2013

In the construction projects there has been accompanied by the emergence of risk from the investment decision-making of the building units to the contractors bidding on projects. Therefore, in order to satisfy the interests of construction units, It is necessary to carry out its comprehensive evaluation of the risk of bidders. In this paper, according to the fuzzy mathematics theory, we discuss the relevant principles of fuzzy evaluation and calculation method, and more, analyze a project example. State the application of this method in construction bidding. Provide the decision supports for the related Companies.
The Nature of Science and the Limitations of Science on Narrow Sense
Authors: Jin De Zhi , Yang Jian Ming
Published: September 2013

In china, Science is widely misused in recent decades. In fact, science has broad and narrow sense. Based on broad and narrow perspective, this paper defines the concept of science, and points out the differences between intension and extension of it. The author analyzes three features of narrow scientific method and the problems of its method itself, clarifies errors in learning and living when using the concept of science, indicates that narrow sense of science is not equivalent to truth itself; the opposition and rejection do not exist between Faith and Science.
Reflection of Sustainable Development on Innovative Mechanical Products Design
Authors: Xiao Chang , Wang Jun
Published: September 2013

This paper is aimed at discussing the sustainable development of innovative product design. From the theoretical point of view of sustainable development, this paper explores the three stages in innovative mechanical Products design: concept development, material selection and life cycle control. The main result is to infuse the concept of sustainable development into these three stages in order to provide new room for development of innovative mechanical Products design. This paper breaks new grounds in specifying the process of innovation of mechanical Products design, enabling the binding point of theory and practice to be more practicable and concrete.
On the Effects of Collaborative Knowledge Innovation on Supply Chain Performance
Authors: Liu Li , Tang Min , Xue Fan
Published: September 2013

During the age of supply chain competition, one of the problems that the enterprises should cope with is to effectively improve the performance through collaborative knowledge innovation in supply chain. This paper builds a knowledge innovation model between a vendor and a manufacturer in the two-stage supply chain. And then we make a quantitative analysis of the model by the game theory and optimum theory, it is found that: (1)The stronger the manufacturer's innovation ability, the more it can attract the vendors involvement in innovation, and when its innovation cost increases, its enthusiasm for participating in knowledge innovation will be weakened; (2) The variation coefficient of marginal cost plays a positive role in promoting innovation level and performance, however, if the innovation cost coefficient is too high, the innovation level may decrease; (3)Not only can collaborative knowledge innovation in supply chain improve the performances of both the vendor and the manufacturer, but also can improve that of the overall supply chain.
Research on the Service System of Wind Power Equipment Aftermarket
Authors: Zhang Xu Mei , Zhang Xiu Zhou , Liu Xiang Yu , Dan Bin
Published: September 2013

With a lot of wind power farms were built and put into operation, the importance of constructing aftermarket and developing aftermarket services becomes more and more obvious to wind power equipment manufacturers. In this paper, the motivations for wind power equipment manufacturers to develop aftermarket services were analyzed. A service system of wind power equipment aftermarket based on wind power industry service alliance was proposed.
The Greening System Model of Old Industrial Removed Area Based on System Dynamics
Authors: Wang Ting Ting , Xu Hong Xue
Published: September 2013

Greening system evaluation index system is built according to some characteristics of green building in the old industrial removed area, and greening system model is established based on system dynamics theory and greening system evaluation index, then the statistical data of Tiexi are used to validate the model, the results prove the model with validity.
The Evaluation Study of Supply Chain Financial Risk Based on the BP Neural Network
Authors: Qiao Lin Si Hang , Lin Zhi Hong
Published: September 2013

In recent years, the supply chain financial has become the focus of attention of the many financial institutions, because the supply chain financing model is to make full use of the supply chain and the characteristics of small and medium-sized enterprise designed. It is not only the effective way of small and medium-sized enterprises in China to solve the difficulty of financing, but also is an effective way of the Commercial Banks expand financial services [ . This paper firstly constructed the financial credit risk evaluation index system of small and medium-sized enterprise based on supply chain, through the BP neural network model analyze credit risk of small and medium-sized enterprise, then predicted their financing credit level, to provide the basis for Commercial Banks for credit.
The Comprehensive Assessment of Rural Power Enterprisedevelopment Ability Based on FAHP
Authors: Lin Zhi Hong , Chen Xue Ran
Published: September 2013

For quantitatively and comprehensively evaluating on the ability of rural power enterprise development,and according to the "San Xin" requestment on rural development,a multilevel evaluation with first-layer of five factors including economic benefit, management level, personnel quality, power structure and development potential and second-layer of seventeen indicators was established with consideration on the main factors affecting rural power enterprise development.A comprehensive evaluation of rural power enterprise development ability model was proposed through using the method of fuzzy analytic hierarchy process (FAHP). The weight of each evaluation index was determined by AHP, and then combined with the experts scoring,FAHP was used to determine present situation of rural power devepment .An illustration with the evaluation result of "medium"indicates that this method is feasible to evaluate rural power enterprise development.
Analysis on the Technology of Crop Straw Curing Molding for Energy-Oriented Using
Authors: Guo Xing Yu , Ruan Jian Wen , Cai Zong Shou , Yu Ji Wen , Ruan Jie Qiong , Li Jian
Published: September 2013

In our country, crop straw output more than 600 million tons per year, which is a huge amount of renewable biological resources, and the prospect of energy-oriented using is promising. This paper have analyzed the main way and technology of crop straw energy-oriented using, carried on the thorough research on the technology of crop straw curing molding for energy-oriented using, and proposed the basic train of thought of promoting our country straw curing molding for energy-oriented using technology development.
Research on Construction of Supply Chain Knowledge Creation Theory Model
Authors: An Xiao Feng , Zhang Xu Mei , Zhu Guang Fu
Published: September 2013

Knowledge creation serves as the core competence of the supply chain. The supply chain knowledge creation theory model, which consists of the epistemological dimensionality and the ontological dimensionality, is to be constructed. With the help of this model, the conversion of the complementary knowledge and the heterogeneity knowledge in the supply chain through three modes is researched, and such conversion is gradually amplified through the individuals, organizations and enterprises in the supply chain; therefore, the supply chain continuously expands, with the scale effect and the innovation ability obtained. Finally, the place of knowledge creation, namely the space and the space type of knowledge creation, is discussed.
Research on Grasping Force of New Type Pneumatic Flexible Finger
Authors: Zhao Yun Wei , Geng De Xu , Liu Xiao Min , Zhang Jin Tao
Published: September 2013

This paper develops a new type of flexible finger employing the pneumatic flexible joints base on the modular design concept. In this work, the mathematical model of the grasping force of the flexible finger is derived and analyzed on the relationship between the air pressure and the grasping force. Further the grasping force experiments of finger using dynamometer and acquire the normal pressure of the finger with different combinations ventilation of joints are conducted, Also, the experimental results are compared with the theoretical results, which confirm the validity of the presented model.
Study on High-Temperature Heat Harm Control Technology in Deep Mine
Authors: Wang Xin Feng , Gao Ming Zhong , Wang Qiang , Li Yan
Published: September 2013

In order to study the high temperature heat harm problem in the process of deep mining, Briefly analyzed the causes of high temperature by using the methods of theoretical analysis and field measurement. In addition, a series of high temperature control methods are put forward. Including take conventional non-artificial cooling and the artificial refrigeration cooling methods as well as new cooling methods of using geothermal energy cooling and combined cooling heating and power technology so many initiatives to solve the problems of high temperature of deep mine. The engineering practice proves the reliability of mine cooling technology,the results can provide a basis for prediction and control of high temperature of deep mine.
Study on the Abrasive Wear in a Ball Type Joint of Automotive Drive Shaft
Authors: Liu Jun , Luo Yuan Xin
Published: September 2013

Ball type joint is one of key component of automotive drive shaft, which is used in a front drive transmission vehicle for transmitting rotary movement from the gearbox output shaft to the wheels with a constant velocity. It has been found that the ball type joint is usually failure caused by abrasive wear. This paper is dedicated to analyze the abrasive wear by theoretical investigation on the relatively slipping velocity of each component of the ball joint, as well as the experimental approach. The results show that the grading of abrasive wear of the components is largely depended on the relatively slipping velocity.
Study on the Relation between Bore Diameter of the Hollow Screw and Static Stiffness of the Dual-Drive System
Authors: Jin Lan , Yan Bing , Zheng Xiao Hui , Wang Yong Wei , Xie Li Ming
Published: September 2013

The size of bore diameter of hollow screw, to some extent, will affect the dual-drive feed system's static stiffness, and then affect the machining accuracy of the workpiece. This paper takes the dual-drive feed system as the research object and builds its finite element model. Use the model to make static analysis in Workbench. After that, we can get the relation between bore diameter of hollow screw and static deformation of the dual-drive system. The results demonstrate that: with the bore diameter of hollow screw increases, the maximum static deformation volume of the dual-drive system gradually becomes larger. This article suggests that the appropriate design size of the diameter should be 4~10 mm. Because the corresponding static deformation of the dual-drive system changes little in magnitude within this range. These advised parameters can provide certain principles for the improvements of a hollow screw shape and size and its parametric design.
An HCI Spatial Layout and Planning Technique for Ship Curved Block Construction
Authors: Zhou Jian , Wang Ai Min , Lu Zhi Bing
Published: September 2013

According to the study on the information technology status of domestic shipbuilding industry, aiming as the demand of full-vision and effective management mode of curved block construction scheduling, the HCI (Human-computer Interaction) spatial layout and planning technique of curved block is proposed. Through Several technical points and rich-client application, the graphics vector modeling of curved block and the dual-dimension block layout and planning dynamic display technology are achieved, then on these bases an HCI scheduling management technology with graphics transformation as core is put forward. Finally, a prototype system was designed and developed to verify in practice.
Thermal Analysis of Edge Illumination Type LED Backlight with Heat Pipe
Authors: Guan Wo Huan , Tang Yong , Ding Xin Rui , Liu Bin , Lu Long Sheng
Published: September 2013

This paper reports on thermal characterization of edge illumination type LED backlight integrated with heat pipes. Heat pipe is integrated with the panel by phase change flattening and expanding process. Thermal capabilities, including the steady-state working temperature and the temperature uniformity along the panels with heat pipes and without heat pipes are compared and analyzed. Results show that the steady-state working temperature on the panel with heat pipes is 1~6°C lower than that on the panel without heat pipes under power range of 15W to 51W of the LED arrays. And the temperature uniformity along the panel with heat pipes is controlled within 2.0°C.
Tooth Surface Contact Stress Analysis of the Straight Bevel Gear Axial Practice
Authors: Lou Jia Jia , Cao Xue Mei , Jiao Ji Song
Published: September 2013

The program of tooth surface and gear inside grid nodes is developed according to the tooth surface equation. Finite Element Analysis of the straight bevel gear axial practice model is established. Order flow contact models of the three teeth and contact pair of gears of the three teeth is developed by APDL language of ANSYS. The static contact stress analysis of axial practice is constructed. The static contact stress of tooth surface distribution and change rule is obtained by calculating. The result shows that axial practice pair of gears of have good meshing performance.
Analysis on Lightning Electromagnetic Fields
Authors: Zhang Pi Cui , He Wei , Wang Liu Ling , Ma Li Feng
Published: September 2013

t is generally needed to know precisely spatial distribution of lightning electromagnetic fields in the lightning protection measurements. Therefore, the research on the lightning electromagnetic field is of practical significance. In this paper, the Maxwell equations were used to calculate and analyze the spatial distribution of lightning electromagnetic fields surrounding lightning current. And the expressions of lightning current electromagnetic fields were deduced under the assumption that the earth was under the condition of perfect conductor. The spatial distributions of the components of lightning electromagnetic fields have been plotted by Matlab. The results would provide fundamental theory for the research of lightning electromagnetic field and lightning protection measurements.
Analysis on Torsional Vibration Characteristics of Tracked Vehicle Gearbox
Authors: Xu Yi Cheng , Cao Feng Li , Li Guo Zhang , Zhou Jing Tao
Published: September 2013

According to the dynamic characteristics of tracked vehicle gearbox system, the integrated influence of elasticity of shaft, gear meshing stiffness and transmission error in the system is considered, and mathematics models of two type configurations are created, Matlab/Simulink model of which are provided. The torsional vibration dynamic model of transmission system with tracked vehicle gearbox is developed and the vibration equation of the system is established. The influences of the transmission errors, moment of inertia, mesh phase and torsion stiffness are investigated respectively. It has important realistic meaning for guiding the gearbox structural design and improving, reducing its fault rate.
Analysis of Coppery Gasket in Water-Saving Valve Stamping Processing and Mold Design
Authors: Wang Zhen
Published: September 2013

The coppery gasket in water-saving valve used to be produced by NC turnery.The gasket manufactured by the processing method has higher accuracy, but it has high cost, and low productivity. This article improved the processing of coppery gasket, and Analysed the method of stamping processing, and designed the mold for coppery gasket in water-saving valve. This method not only ensured the product quality,but also improved productivity and reduced cost. And it Can provide the reference for similar parts.
The Feature-Based Parametrized Solid Module and the Dynamic Simulated Research of Medical Chest
Authors: Du Zhen Jie , Gao Wan Yu , Kang Hai Hong , Liu Chang Jun , Yang Jian , Liu Sheng Jun , Sun Xiao Jun , Tian Feng
Published: September 2013

This essay introduces the basic methods and the key technics of establishing the parametrized solid module of field medical chest on SolidWorks platform and how to dynamically simulate it by means of 3DS MAX. It explains how to avoid the module repetition of medical chest and to make observation of the work of its each part so as to shorten the product development period and improve its design quality.
Dynamics Analysis and Simulation on Load-Unload Bagged Materials Robot
Authors: Zhou Ke Yuan
Published: September 2013

The dynamics is important for the robot system simulation and feedback control design, so the dynamics of load-unload bagged materials robot is analyzed based on the second kind Lagrange theory, and the precise dynamics model is established. The solution of dynamics differential equations are solved by procedure matlab, dynamics Simulation is analyzed based on platform of ADMAS dummy prototype, obtain series of graph angular acceleration, driving force, moment.
Spudcan-Soil Interaction Analysis of a Jack-up Based on Elastic-Plastic Model
Authors: Zhang Jian , Tang Wen Xian , Qian Hao , Cao Jun
Published: September 2013

In order to investigate the jack-up spudcan-soil interaction behaviors, numerical simulation and design of experiments (DOE) of a jack-up were presented based on elastic-plastic foundation model, in operating and survival conditions. Spudcan load assessment indexes called RVAB, RHAB and RMAB were put forward by the authors, which were also the responses of the DOE. The results showed that, for both conditions, vertical load V on spudcan A is higher than that on spudcan B, while horizontal load H2 and moment M3 on spudcan A are lower than that on spudcan B. Yield was found on the Spudcan A-soil interface, and the plastic components in survival condition are higher than the ones in operating condition. Friction angle and unit weight are two important soil parameters that have a great effect on the spudcan-soil interaction behaviors.
Analysis of Friction Effect on Dynamic Characteristics of Artificial Feel System
Authors: Xue Hong Jun , Wu Huo Gen , Zhang Xiao Yan
Published: September 2013

A complete mathematical model of artificial feel system of a vehicle fly by wire flight control system was established after analyzing the heading mechanical structure of it. Modeling it by means of centralizing the distributed system parameters and establishing it to dynamic model, the nonlinear factors such as clearance and friction in the system were simplified reasonably. To establish a corresponding mathematical model, the dynamic model was established by means of dynamic equivalent model method resulting in a multi-freedom model. The mathematical model was simulated in Matlab/Simulink by modular way, and results were consistent to trial data. Friction as an important nonlinear factor have impact on system performance, analysis of its effect on dynamic characteristics of human feel system were in the condition of inputting different forms and amplitude signal . This provided guidance for designing system.
Design and Analysis of Hydraulic System of Balancing Device on Top Drive
Authors: Wang Hong Wei , Wang Qing Yan , Yu Ping , Zhang Chun Peng , Zhang Peng
Published: September 2013

The balancing device is the core component of top drive. Its role is to balance the gravity of top drive to prevent damage to the threaded joint in course of making up and breaking out of threaded joint of drill pipe. At the same time it can help male thread pop up from the drill pipe box in course of breaking out of threaded joint of drill pipe. Aiming at the problems of hydraulic system of the current balancing device that thread endures big normal force in course of making up and breaking out of threaded joint of drill pipe, a new hydraulic system was designed in this paper, and the simulation was analyzed based on AMESim. Through the simulation analysis, the new hydraulic system is reasonable and the normal force that screw endures is very small, which can reduce wear significantly.
Research on Entity Model Directly Layering Software Design Based on the Secondary Development of AutoCAD
Authors: Fan Li Rong , Cao Yi Qing , Ren Chong
Published: September 2013

FDM process of rapid prototyping systems at present which can only reads the STL format file, based on this format can be get the 2-d layer is composed of straight line segments connected polygon contour, makes the model layer of information that are geometric distortion, leading to surface accuracy is poorer; Produced based on STL model for layered geometric distortion problem, this paper put forward to directly layering of entity model, and through the ObjectARX which is the secondary development tools of AutoCAD realizes layer directly in the software, the layer of 2-d contour for smooth curve, so as to ensure accuracy, it will be played an important role in the practical application later.
The Method of Equipment Maintenance Accessibility Evaluation Based on Index Correlation Degree
Authors: Xu Da , Wang Bao Qi , Li Chuang , Wu Xi
Published: September 2013

Aiming at the disadvantage of existing equipment maintenance accessibility evaluation method, this paper studied the project of equipment maintenance accessibility evaluation. a method of equipment maintenance accessibility evaluation in the virtual environment is put forward based on Matrices Permanent and index correlation degree , at last an example is given. It is significant for developing maintainability verification and increasing Equipment Maintainability in the course of equipment digital mock-up designing.
Research on the Algorithm for Capacitance of Charged Plane Conductors Based on MoM
Authors: Li Guang Yu , Liu Jin Bo , Yu Xiang Zhi , Gao Hong Min
Published: September 2013

For the analysis of plane charged conductors by the method-of-moments (MoM), the basic idea and a simple derivation of the formulas is presented in this paper. Veneer conductor capacitor and dual-board conductor capacitor are respectively solved by the method-of-moments, with piecewise function as the basis function and δ function as the weight function. The comparison of the accurate solution illustrates the method-of-moments with good accuracy.
Study on the Control Law for Water Trajectory of Unpowered Carrier under Wave Force
Authors: Pan Guang , Shi Yao , Wang Peng , Du Xiao Xu
Published: September 2013

During the process of exiting from water, the unpowered carrier launched by submarine will be disturbed by the wave force. It will have impact on the trajectory of carrier. Based on carrier vehicle exiting water requirement the six degrees of freedom mathematical model of carrier was established. The calculation model for wave force was built based on the two dimensions wave theory. The steering sequence of carrier was designed and the process of the carrier out of water was simulated under the influence of wave force. The results show that the vehicle movement stability, the control law is reasonable and the simulation methods and results of engineering research had a certain reference value.
The Double Power Flows the Difference Transmit Immediately to the System Development Research
Authors: Liu Quan Zhi
Published: September 2013

This article in changes the double power to some model bulldozer to the suitable steering system to flow the type difference transmit immediately to in the system research foundation, has carried on the difference transmit immediately to the organization kinematics characteristic analysis, has established the rotation gear kinematics equation, to transformed after the crawler dozer to carry on the parameter design, and carried on the parameter computation.The computed result has confirmed this new rotation gear rationality and the feasibility.
The Generation of Three-Phase SPWM Wave Based on FPGA
Authors: Lu Yuan , Liu Fei Teng , Song Xiaoou
Published: September 2013

This paper presents a method of generating the three-phase SPWM wave based on FPGA. In a three-phase PV inverters or other using DC to converte into a three-phase AC system,it can be used as six IGBT gate drive signals of a three-phase inverter bridge.This article analysed the principle of the three-phase inverter circuit , obtaining the waveform of the three-phase SPWM wave. The 60 SPWM wave of each sine wave at 50Hz,it designs the hardware circuit to generate the waveform. Hardware circuit of hardware programming language makes the simulation of the three-phase drive waveform in Quartus II,and the program is downloaded into FPGA chip Cyclone II EP2C8Q208N to get waveform output. This design uses a counter method, checking ROM table to determine the preset value of the counter, and the output pulse width control can be achieved by changing the size of the preset value. We designes a three-phase adjustable power using this method and achieved the intended purpose.
Analysis of the Screw Thread Connection Strength Based on Nonlinear Finite Element Method
Authors: Sun Fu
Published: September 2013

Some parts of the projectile is in screw connection, the stress and deformation caused by screw threads are important indexes of the security, and therefore stress distribution of the connection of thread must be accurately calculated. According to the structural characteristics of threaded connection, nonlinear finite element contact analysis was used, strength of the thread connection part was simulated and analyzed by applying effective loads, and this algorithm was validated.
Optimal Design on Seedling Slot of Industrialized Notoginseng Seedling
Authors: Wang Lei , Yang Wen Cai , Xi Qi , Yang Hang
Published: September 2013

to achieve standardized design of industrialized notoginseng seedling slot, this paper is based on analyzing existing seedling slot to propose a total of six kinds of design schemes which are combining structure and size. Then four evaluation criteria are constructed that consist of land-use ratio, mechanical operation stability, economic rationality and manual operation convenience. At last, Scheme optimization is using analytic hierarchy process (AHP), the best scheme is found
Based on Pro/E Design and Assembly of Stamping Flip Composite Mold
Authors: Wu Ming Qing
Published: September 2013

Q235 stamping material thickness is 1 mm, with flip composite mould for production. Mold design using Pro/E, primarily for intensive convex, concave die, punching die design is analyzed, and based on Pro/E mold assembly.
Bipolar Resistive Switching Characteristics of CeO2 Film Based ReRAM
Authors: Zhu Yong Dan , Liao Hong Hua , Tan Jian Jun
Published: September 2013

This paper reports the resistive switching characteristics and mechanism of CeO2 based ReRAM. The CeO2 films were deposited on Nb:SrTiO3 substrates under different oxygen pressures (0.01Pa and 10Pa) to obtain different concentrations of oxygen vacancies in the films. The results show that the resistive switching properties become more pronounced with more oxygen vacancies in the CeO2 films. The device with 0.01Pa oxygen pressures exhibits high resistive switching ratio of 2×103 and multilevel memories. Furthermore, a model based on the modification of the interface property induced by the oxygen vacancies in these structures is proposed to elucidate the underlying physical origins.
Key words: resistive switching, oxygen vacancies, carrier injection, multilevel memories.
Effect of Calcium Addition on the Cast Microstructure of a Kind of HSLA Steel
Authors: Liu Yan , Wang Jian Ming , He Chun Lin , Chen Li Quan
Published: September 2013

The rapid development of the large steel structure brings a great opportunity for steelmaking industry. The steel plates not only have the strength and toughness but also can withstand the high energy input welding. Using the calcium oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the structure steel. This experiment takes the HSLA steel as the research object, the second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Ca-Si alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.
Effect of Nanometer Calcium and Magnesium Oxides Addition on the Inclusions in the Cast Microstructure of X80 Pipeline Steel
Authors: Wang Jian Ming , Liu Yan , He Chun Lin , Liu Yang
Published: September 2013

Nanometer calcium and magnesium oxides were added into molten steel by the carrier method in the experiment. The experiment takes the X80 pipeline steel as the research object and analyses the effect of nanometer calcium and magnesium oxides addition on the inclusions in the cast microstructure of the X80 pipeline steel. The scanning electron microscope (SEM) was used to analyse the morphology and distribution of the inclusions in the cast microstructure of the X80 pipeline steel. The results reveal that there are a small amount of inclusions in the sample of no nanometer oxides addition. With the amount of the nanoMgO oxide addition rising, the number of the inclusions in the sample firstly increases and then decreases gradually. When adding 0.05 wt% nanoMgO or CaO oxides, the size of the inclusions is big and the aggregation phenomenon appears. When adding 0.02 wt% nanoMgO or CaO oxides, the number of the inclusions in the cast microstructure is the most, whose size is smaller, about 2~4 μm and the inclusions are the most uniformly distributed.
Fluorescence Spectrophotometric Determination of Bisphenol A in Plastic Food Packing Materials
Authors: Sun Jia Yue , Xu Qi Guang , Di Qiu Mei
Published: September 2013

A new method based on the application of fluorescence spectrophotometry, which applied to the direct determination of bisphenol A (BPA) in food packaging materials, has been developed. Experimental results reveal that the linear rangeis0.1-0.6mg.L-1atλex/λem =266/304nm (pH =8). The calculated standard working curve is y=424+1031x, and R2=0.9951.Both of the optimization process and the final results, including the analysis of real samples, are given and discussed..
Influencing Factors of Flow Rate of Electromagnetic Pump Used to Aluminum Alloy Quantitative Pouring
Authors: Hou Ji Bo , Deng Xiong Fang , Tian Ru Na , Hou Jian Bin
Published: September 2013

The effects of electric current, the altitude of the liquid outlet and liquid level change within crucible in direct-current electromagnetic pump (EMP) used to quantitative pouring of aluminum alloy on flow rate were studied. The results show that the effects of electric current on flow rate is affected by the hydraulic resistance; flow rate decrease with the increasing of the altitude of liquid outlet; when the output of aluminum alloy is large, the liquid level change within crucible have a significant impact on flow rate.
In Situ Growth of TiB2 Whiskers in TiB2-TiCx Matrix Powder
Authors: Xu Liang , Huang Chuan Zhen , Liu Han Lian , Zou Bin , Zhu Hong Tao , Wang Jun
Published: September 2013

The TiB2 whiskers were fabricated in TiB2/TiCx composites by the in-situ synthesis process. The phase composition, thermodynamics, weight loss and lattice parameters of the obtained phases were studied. The obtained TiB2 whiskers showed an aspect ratio of 10-20 and a diameter of 0.5-1.5 μm. The synthesized TiC was a non-stoichiometric phase with a lattice parameter of 4.274 Å. Most of the whiskers had the cylinder shape, whereas, a few whiskers showed a bead-necklace morphology. The growth mechanisms of TiB2 whiskers were governed by the solid-liquid-solid (S-L-S) mechanism and the particle-to-particle connection mechanism.
Microstructure of Spray-Deposited CuCr25 Alloys Preform and its Development during Subsequent Processing
Authors: Liu Hong Wei , Wang Feng , Li Xi Wu , Li Zhi Hui , Zhang Yong An , Xiong Bai Qing
Published: September 2013

The CuCr25 alloys were prepared by spray forming technology, and effect of process parameters on the deposit was studied. The microstructure of CuCr25 alloy prepared by spray forming was studied, and the size of chromium particles was 3-10μm. It is fond that spray-deposited CuCr25 alloys were hot forged and hot isostatically pressed to full densification,and the size of chromium particles was increased little after being hold at 1070°C for 60mins. Conclusions were drawn from the researching results that spray forming was an ideal method to prepare CuCr25 alloys with fine chromium precipitates and homogeneous dispersion. After hot forging and hot isostatic pressing, the size of chromium particles was increased to 10-15μm. the density of the CuCr25 alloy could be 99%.
Phase Transition and ThermodynamicProperties of OsN2 under High Pressure
Authors: Fu Zhi Jian , Jia Li Jun , Quan Wei Long
Published: September 2013

The lattice parameters, phase transition, and thermodynamic properties of OsN2 in pyrite and fluorite structure are investigated by first-principles calculations. The pressure and temperature induced phase transitions of OsN2 from fluorite structure to pyrite structure have been obtained. It is found that the transition pressure of OsN2 at zero temperature is 158.2 GPa, and there exists no transition temperature. In addition, the thermal expansion, the Debye temperature, and the Grüneisen parameter in diverse pressures and temperatures about these two structures have also been obtained. Key words: transition phase; thermodynamic properties; OsN2 PACS numbers: 71.15.Mb, 64.70.Kb
Process Optimization and Preparation of Ferric Oxide Nanoparticles by Homogeneous Precipitation Method
Authors: Ding Jie Feng , Li Jian Fen , Dan Wei Yi , Wang Qiang Sheng , Zhou Han Fen
Published: September 2013

For the purpose of developing an effective Fe2O3-doped nickel-based catalysts to be used in biomass gasification, Fe2O3 nanoparticles were prepared by homogeneous precipitation method involving an aqueous solution of Fe (NO3)3·9H2O and urea as precipitator. Different approaches, such as XRD and SEM, were used to characterize the products. Meanwhile, the effects of various technical parameters in preparation process on the yield of products were investigated, and optimal conditions for preparing Fe2O3 nanoparticles were found as follows: the molar ratio of urea to Fe (NO3)3·9H2O for 5:1, temperature of precipitation reaction for 125°C, concentration of iron salt for 0.20mol/L. The Fe2O3 nanoparticles prepared under the optimal conditions were spherical in shape and well dispersed; they had high purity and a fine crystal phase of cubic syngony with a mean particle size of about 28nm.
Properties of Kevlar Fibers by Surface Modification
Authors: Jia Zhao
Published: September 2013

The surface of Kevlar fiber was modified by hydrogen peroxide solutions (H2O2) in this article. The interfacial properties of Kevlar fiber/epoxy composites were investigated by the single fiber pull-out test (SFP). The results showed that the interfacial shear strength (IFSS) of Kevlar /epoxy composites was remarkbly improved after surface modification and the breaking strength has not been affected appreciably. It provided an efficient method to make the surface modified Kevlar fiber for the application for the advanced composites at a lower production cost.
Research and Develop Intelligent Temperature-Controlled Fabric Starting from the Internal Structure of Textile Fibers
Authors: Zhang Tong
Published: September 2013

ntelligent temperature-controlled fiber can perceive changes in the environment and correspond accordingly subject to stimulation of certain conditions. In the functional innovation, the intelligent fibrous material modifies the nature of conventional synthetic fiber and the original performance of natural fiber and chemical fiber. Through in-depth analysis of the existing achievements, strive to explore the application prospect of intelligent temperature-controlled fiber starting from the internal structure of textile fibers.
Study of Crystallizer 3D Modelling Based on Fluent and its Application in Production of Gypsum
Authors: Luo Bi Jun , Wu Hai Hong , Wang Yu Qi , Huang Xi Ping , Zhang Qi
Published: September 2013

The research status of crystallization process and crystallizer of gypsum is introduced in this paper. Progress in 3D mathematical simulation of crystallizer based on Fluent is summarized, and the application of the 3D model in the construction and optimization analysis is also described. Furthermore, the prospect of Fluent applied in the design and optimization of gypsum crystallizer is introduced. Finally, the potential and prospect of Fluent basing on the 3D mathematical simulation of crystallizer in the production of gypsum is put forward.
Study on Seismic Performance of Reinforced Concrete Multi-Span Cantilever Girder Bridge after Reinforcement
Authors: Li Xiu Fang , Wu Rui Fu
Published: September 2013

Basing on the reinforcement of a practical project, which is a reinforced concrete multi-span cantilever girder bridge, by changing section properties to improve the bearing capacity and seismic performance of the bridge. Then, a finite element model is established and solved by using the subspace iteration method, the frequency and vibration type is compared that of the bridge before and after reinforcement, the effectiveness of the new method on the structural dynamic characteristic is verified at the same time. Then, the seismic response of the bridge is calculated and analyzed by using the response spectrum method, which can provide method for reinforcement of similar bridge.
Yellow Upconversion Luminescence in Ho3+/Yb3+ Co-Doped La2(WO4)3 Phosphor
Authors: Sun Jia Yue , Xue Bing , Sun Guang Chao , Cui Dian Peng
Published: September 2013

The strong yellow upconversion (UC) light emission has been observed in Ho3+/Yb3+ co-doped La2(WO4)3 phosphor under the excitation of 980 nm diode laser. The phosphors were synthesized by the traditional solid-state reaction method. The phrase structures of the samples were characterized by X-ray diffraction (XRD). The doping concentration of Yb3+ was determined to be 20mol% for the strongest yellow emission. Then, the dependence of UC emission intensity on excitation power density showed that the green and red UC emissions are involved in two-photon process. The possible UC mechanisms for the strong yellow emission were also investigated.
Design and Optimization of Surface Properties for Diamond-Like Carbon Films by Sputtering Depositions
Authors: Jean Ming Der , Liu Chyuan Du , Wang Shin Fuh , Li Chun Han , Kao Kuang Hvi
Published: September 2013

Analysis of mechanical properties of diamond-like carbon (DLC) films based on experimental designs was reported to optimize characterize by a magnetron sputtering. An orthogonal array experiment was introduced and the effects of deposited parameters on the films were systematically explored. The films were analyzed by scanning electron microscopy (SEM). Friction and wear tests were carried out using a pin-on-disk tribometer. In this study, the two stages such as adhesive and abrasive wears for tribological properties are clearly visible among L18 tests, where at the higher wear volume losses exist an abrasive wear while the less wear volume losses appear an adhesive wear. A slightly worn surface with a glassy carbon phase appeared and a lower wear volume loss became visible in the DLC films. Through the optimal design, the experimental results demonstrate the tribological properties on DLC multilayer films are increased by a magnetron sputtering, thereby justifying the reliability and feasibility of the approach.
Based on Workbench Analysis of Load Bearing Properties for the WPC Pallet
Authors: Wei Zhan Guo , Wang Zhong Wei
Published: September 2013

in this paper Workbench was used for the analysis of the WPC pallets load bearing properties. The stress strain data of the WPC pallet was obtained and the analysis of fatigue damage under uncertain amplitude load in transport was done by Fatigue Tool. The results of finite-element analysis provide the basis for the structure optimization design of this pallet.
Effective Photocatalytic Disinfection of Escherichia coli by One-Dimensional Ag2V4O11 Nanowires under Solar Light Irradiation
Authors: Ju Peng , Wang Peng , Zhang Dun
Published: September 2013

In this paper, one-dimensional Ag2V4O11 nanowires were prepared by a facile method and developed as a novel visible-light-sensitive photocatalyst for the disinfection of Escherichia coli (E. coli) under solar light irradiation. The as-prepared Ag2V4O11 had uniform wire-like structure with large specific surface area and good visible-light absorption performance. Experimental results indicated that almost all (99.9%) of the initial bacteria were killed after 30 min reaction in the presence of 1 mg/mL Ag2V4O11 under solar light irradiation. The photocatalytic mechanism was studied by active species trapping experiments, revealing that the hydroxyl radicals (·OH) played key roles in the inactivation of bacteria. This study provides a potential effective Ag2V4O11 nanowire photocatalyst for water purification and other applications.
Electrochemical Behaviors of Pb–0.3%Ag-0.06%Ca Rolled Alloy Anode during and after Zinc Electrowinning - Tafel Investigations
Authors: Yang Hai Tao , Liu Huan Rong , Guo Zhong Cheng , Chen Bu Ming , Zhang Yong Chun , Xu Rui Dong
Published: September 2013

In this paper, the oxygen evolution potential and kinetics of Pb–0.3%Ag-0.06%Ca rolled alloy anode during the 15 days electrolysis in acid zinc sulphate electrolyte solution were investigated with galvanostatic polarization curve and Quasi-stationary polarization (Tafel) techniques. The results revealed that the anodic oxygen evolution potential and reaction kinetics varied a lot during the electrolysis for it is a process indicating the formation and stabilization of anodic oxide layer. With the increasing electrolysis time, the potentials (MSE) and overpotentials of oxygen evolution mainly present a declining trend while the electrode surface exchange current density a rising trend.
Investigating the Use of Nanoscale Bilayers Assembly on Stainless Steel Plate for Surface Hydrophilic Modification
Authors: Wu Shen Chun , Wang Dawn , Lin Sin Jie , Ciou Pin Wun , Chung Chen Yu , Su Shen Jwu , Chen Yau Ming
Published: September 2013

This study investigated the use of nanoscale bilayers assembly for hydrophilic surface modification on stainless steel plate. This study first performed nanoscale bilayers assembly method, with the addition of top layer coatings for durability purposes, to modify the surface structure and thereby the hydrophilicity of the surface at 15, 17, 20, 23, and 25 bilayers. The relationship between the number of bilayers and the resulting contact angle was then empirically established. Results showed 17 bilayers to be the optimal number of bilayers among the samples tested, resulting in the smallest contact angle of 11° (compared to 70° on unmodified surface), corresponding to the highest surface wettability and hydrophilicity. From 0 to 17 bilayers, the contact angle seems to decrease linearly with the number of bilayers. Beyond 17 bilayers, at 20, 23, 25, and 30 bilayers, the samples showed no significant improvements in contact angle or hydrophilicity.
A Method of Generating High-Precision Offset Frequency Based on Quadrature Phase Shift
Authors: Wang Guo Yong , Wang Wen Li , Li Xiao Hui , Zhu Feng
Published: September 2013

By Studying the Principle of Single Side-Band Mixing, a New Method Based on Quadrature Phase Shift for Generating High-Precision Offset Frequency was Proposed. Different Solutions of Precision Quadrature Phase Shift were Designed for Different Frequencies, Including Combining Analog Quadrature Splitter and Wire Delay for 10MHz, Combining Digital Phase Shift Module Using CPLD, Digital Delay Line Chip and Wire Delay for 10kHz. According to the Design Goal, the Design Parameters and Requirements of Narrow-Band Low-Loss Filter were Analyzed. Finally, an Offset Frequency Generator Whose Output Frequency is 9.99999MHz was Developed and an Experiment System is Constructed to Test the Performance of the High-Precision Offset Frequency Generator. According to the Experiment Results, the Following Conclusion can be Drawn that the Allan Deviation of the 9.99999MHz Offset Frequency Generator is 4.03e-13 which is close to the Frequency Stability of 10MHz Signal of Hydrogen Maser MHM-2010 of Sigma Tau Corporation. the High-Precision Offset Frequency Generator can be Used as a Common Source in Dual Mixer Time Difference and as a Reference Signal in Beat Frequency Method.
Research on the Performance Change by Adding Graphene to Copper
Authors: Fan Tao Tao
Published: September 2013

This paper studies the performance change by adding a certain percentage of graphene and high-temperature reduction graphene to copper powder,which would be sinteringed by Spark Plasma Sintering (sps) under certain temperature and pressure. The image of electrical conductivity measured by Physical Property Measurement System (ppms) showed that the electrical conductivity of the sample added with graphene increased by 4.39% compared with the sample added with no graphene. Meanwhile ,hardness increased by 50%. It showed that graphene could improve the conductive properties as well as the strength of copper, which suggests the graphene will have great potential application in power transmission conductor and electrical contact materials.
Temporary Resistive Switching Effect in Cu2O Based Heterostructure
Authors: Wu Chang Kun , Zhu Yong Dan , Liao Hong Hua , Tan Jian Jun
Published: September 2013

We report a temporary resistive switching (RS) behavior of Cu2O based heterostructure. The Cu2O films were deposited by PLD method under different oxygen pressure (10-2 Pa and 10Pa). The results show that the RS performance of Cu2O (10Pa) is better than that of Cu2O (10-2 Pa). The Cu2O (10Pa) based heterostructure shows high resistive switching ratio of over 103 at read voltage of -0.5V after applied 3V/-5V pulse voltages. Moreover, the resistance states could be switched reversibly among multilevel resistance states by changing the magnitude of set or reset pulse voltages. It is demonstrated that the RS mechanism agrees with the carrier injection-trapped/detrapped process at the interface.
Injection Molding Process Parameters Analysis and Optimization Depending on Moldflow
Authors: Li Na , Liu Hong Bin
Published: September 2013

t was carried out the simulation experiment for injection molding process by the factorial experiment method and the Moldflow software. The model was a computer panel. The responses target to experiment was the warpage. The data was used the ANOVA analysis which came from the factorial experiment. The effect levels of the parameters were got, such as the mold temperature, the injection time, the pressure, the melt temperature et .al. Through the analysis of the response figures, it obtained injection molding process parameters of the optimal combination plan, and the simulated verification process. The experiment proved that this method can reduce test times and guarantee the excellent quality of products.