bluuebunny/crossref_metadata_2025 huggingface dataset:
Correlation of Surface Alloyed Microstructure of Pure Magnesium With its Corrosion Behavior
Authors: Liu Yu Gao
Published: February 2012

This paper represents a summary of experimental results dealing with the time dependence of surface diffusion alloyed microstructure and its corrosion behavior at given temperature. The experiments were performed at 485°C for different solid diffusion time (6h, 12h, 18h ) and thus the surface alloyed microstructure of pure magnesium has been obtained. Optical and electrical microscopy and EDS compositions analysis were used to examine the cross sectional microstructure characteristics of alloyed layers of treated samples. It is shown that the new phases formed and its continuity, depending on the diffusion treated time at given temperature, have a noticeable influence on corrosion resistance and corrosion mechanism. The new formed phase Al5Mg11Zn4 was inert to the chloride solution compared with pure magnesium and acted as a corrosion barrier. It was concluded that the continuous Al5Mg11Zn4 phase was beneficial from the point of view of corrosion resistance.
Application Research on Lignite Quality-Improving of Pulverized Coal Direct-Fired Stove
Authors: Zhang Zhen Wei , Zhang Cheng , Zhang Liang , Cao Wei Wei
Published: February 2012

This paper mainly focuses on the work principle of pulverized coal direct-fired stove aiming to obtain the process and characteristics of thermal gas furnace. The pulverized coal created in the drying process can be captured directly in the internal system, which can deal with such problems as storage and transport, especially the environment protection problem such as dusty flying. Pulverized coal stove can be promoted in the lignite quality-improving project based on the data collected from the production field.
Influencing Factors on Heat Transfer Performance for Flow Boiling of R410A in Horizontal Micro-Fin Tubes
Authors: He Hong Ping , Ma Hu Gen , Bai Jian Mei
Published: February 2012

Flow boiling heat transfer performances of refrigerant R410A in the horizontal micro-fin tubes with different geometric parameters were investigated. The dependencies of forced flow boiling heat transfer coefficient of R410A on mass flow rate, heat flux and were studied and the mechanism of flow boiling heat transfer under different working conditions were discussed. For a comparison, the influences of fin number and fin height of micro-fin tubes on heat transfer were also studied. The differences of heat transfer coefficient between R22 and R410A were analyzed. It is found that the heat transfer coefficients were nearly same for R22 and R410A and, in fact, the heat transfer coefficient of R22 was just a little higher than that of R410A by 4-7%.
Fault Modeling for Electro-Hydraulic Servo System Based on Hybrid System
Authors: Zhou Li , Jiang Xin Hua , Liu Yan
Published: February 2012

A parametric fault model of electro-hydraulic servo system based on hybrid system and multiple linear regression model was put forward. First of all, the operating condition of electro-hydraulic servo system was abstracted to discrete states, then using multiple linear regression algorithm, the model parameter were identified based on the statistical analysis of sample data. Finally, an electro-hydraulic servo system fault model was constructed combining the fault parameter. Compared to the previous fault model based on experimental modeling method, this model was constructed based on pressure, flow rate sensor data fusion, two parameters are correlated in the base layer, which can effectively improve the diagnostic decision robustness. The parametric fault monitoring and diagnosis experimental showed the effectiveness in fault monitoring.
Knowledge Base System of Spiral Bevel Gear Based on Design Tree
Authors: Hu Chang Wei , Zhao Dong Sheng , Chen Xin Du
Published: February 2012

With analyzing currently existing gear design system, some shortcomings are found. To overcome the shortcomings a design tree model of spiral bevel gear based on knowledge constraint is proposed. Some useful methods for dealing with complicated data or graph are introduced. Finally, a knowledge base system based on integration case-based reasoning with design tree reasoning is built and proved feasible and efficient by the Self-developed spiral bevel gear design system.
The Research of 2 Degrees of Freedom Vertical Vibration System Modeling for 4-High Hot Strip Mill Stands
Authors: Ma Wei Jin , Wang Mi Rui , Li Feng Lan , Wang Jun Yuan , Xiong Shi Bo
Published: February 2012

A lumped mass model with two degrees of freedom for the vertical vibration system of four roller hot strip rolling mill stand is proposed, and then the parameters of dynamic model , include the equivalent mass , equivalent stiffness and its natural frequencies, were calculated by MATLAB package. The correctness of the model is verified via field vibration testing and signal analysis in the strip rolling process. Comparative the six degrees freedom model, the two degrees freedom model of our proposed is simplified reasonability and the model accuracy is maintained certainly . The two degrees freedom model is critical for the research of digital simulation of the strip rolling process. The research result have important theoretical and practical significance for the parameter optimization of the AGC system , vertical vibration control, the product quality improvement and the rolling speed increase for the rolling mill system.
Application of Low-Frequency Energy Increment Technology in Hydrocarbon Prediction
Authors: Li Zhi Ming , Hu Xue Yan , Zhen Ling Xia
Published: February 2012

Based on the Biot theory and laboratory data, engineers of LandOcean recently develop a certain technology for hydrocarbon detection in multi-phase medium in order to reduce ambiguity and uncertainty. The sensitivity of the technology is superior to others especially in carbonate pores and cave detection, igneous hydrocarbon prediction and fluid detection of non-well areas. A number of projects and wells drilling proved that this technology is effective and reliable.
3.5m Head Sheave Finite Element Analysis
Authors: Zhao Xiu Ting , Meng Jin
Published: February 2012

Using Pro/E powerful entity modeling functions and ANSYS finite element analysis of the powerful function, both integration, to spoke type large head sheave work state are analyzed, and establish the mechanical model of the finite element. Through the finite element calculation, carry the strength analysis and research to head sheave in the different conditions. The calculation results show that head sheave works in alternating stress, it is concluded that head sheave of deformation and stress distribution laws. To design and develop spoke type large head sheave provides the basis.
Study on the Reaction and Thermo-Physical Properties of PC and PBT Blend
Authors: Wang Ping , Cheng Li Hua , Zhao Jian Qing
Published: February 2012

Blends of polycarbonate (PC) and poly(butylene terephthalate) (PBT) were investigated. For 40 wt % PBT, it forms a continuous phase, the glass transition temperature (Tg) shifts to the lower temperature region. This direct comparison of XRD patterns of pure PBT and PBT containing 1.1% TPPi studied the impact of the crystallization of PBT and TPPi. We can see that diffraction peaks of XRD diagram of PBT/TPPi were broadened. When PBT content was added to 1.1% TPPi, the FWHM increases from 3.8 to 4.2 when diffraction angle was in the range of 16.9 degrees to 17.1 degrees. Thus, the addition of TPPi resulted in the small spherulite size of PBT phase, thus elaborating the sample transparency phenomenon.
The Research of Inking Installation Based on Virtual Prototyping Technology
Authors: Wang Xiao Hua , Qi Yuan Sheng , Sun Jun
Published: February 2012

In order to improve the quality of product design, reduce the cost, shorten the development cycle, virtual prototyping technology is used in the process of on the three point support type clutch press mechanism. The design scheme is rapid implemented through establishing three-dimensional modeling, assembly and disassembly, adjustment mechanism simulation, motion simulation of mechanism. So that the physical, mechanical performance of mechanism is analysised, simulated, predicted. Through the virtual operation simulation, early detection of defects in design, to realize optimization design.
The Effect of Al-BSF on Seff and Rb in Industrialized Mono-Silicon Solar Cells
Authors: Dai Shan Shan , Zhang Gao Jie , Luo Xiang Dong , Wang Jing Xiao , Chen Wen Jun , Ma Yue
Published: February 2012

In this work, the effect of aluminum back surface field formed by screen printed various amount of Al paste on the effective rear surface recombination velocity (Seff) and the internal rear reflectance coeffeicient (Rb) of commercial mono-silicon solar cells was investigated. We demonstrated the effect of Seffand Rbon the performance of Al-BSF solar cells by simulating them with PC1D. The simulated results showed that the lower Seffcould get higher open circuit voltage (Voc), at the same time, the larger Rbcould get higher short-circuit current (Isc). Experimentally, we investigated the Seffand Rbthrough depositing Al paste with various amount (3.7, 5, 6, and 8 mg/cm2) for fabricating Al-BSF mono-silicon solar cells. Four group cells were characterized by light I-V, spectral response, hemispherical reflectance and scanning electron microscope (SEM) measurements. It was found that, a minimum Seffof 350 cm/s was gotten from the cells with Al paste of 8 mg/cm2, which was extracted by matching quantum efficiency (QE) from 800 nm to 1200 nm with PC1D, and a maximum Rbof 53.5% was obtained from Al paste of 5 mg/cm2by calculating at 1105 nm with PC1D. When the amount of Al paste was higher than 5mg/cm2, there were less Seffand lower Rb. On the other hand, when Al amount was 3.7mg/cm2, it was too little to form a closed BSF. Based on the SEM graphs and simulations with PC1D, a simple explaination was proposed for the experimental results.
The Design Principle and Application of Thermally Protected Metal Oxide Varistor TMOV
Authors: Zhang Sa , Xu Zhong Hou , Chen Shi , Xu You Sheng , Wu Gen Hua
Published: February 2012

Metal oxide varistors referred to as MOV were widely applied due to its excellent non-linear volt-ampere characteristic. In spite of its predominant function and using, MOV is always failed in value due to the increased temperature of MOV itself under an applied external field. The varistors assembly with an fusible alloy type thermal cutoff (called TMOV as follows) was designed in this paper, and it can make MOV avoid over-heat from degradation, failure and thus can prevent from fire hidden trouble, which was confirmed by experiments. It is really a very important technological improvement and breakthrough in over-heat protective field of MOV.
Research on the Influence of Conical Anvil on Upsetting Process of Forging by Finite Element Simulation
Authors: Li Yong Hua , Zhang Jing
Published: February 2012

The upsetting process of cylindrical forging was investigated using finite element method. The influence of conical anvil on deformation rule of metal and distribution of strain and stress was studied using software MSC. Marc. The simulated results indicated that it had a smaller rigid zone and more homogeneous deformation zone in the billet during upsetting process with conical anvil compared with flat anvil. The critical reduction in height which could assure the three dimensional compressive stress states for the upsetting with conical anvil was smaller than that for the flat one.
Dynamic Modeling of Continuum Flexible Leg System for Micro Robot
Authors: Li Wei Da , Li Juan , Hu Hai Yan , Li Man Tian , Sun Li Ning
Published: February 2012

The micro robot that based on resonant principle can get high speed and high precision. However its leg is usually a flexible continuum with complex shapes, and its dynamic modeling is a key problem during researching this kind of robot. A method combining finite element with modal coordinates is presented, and is used to build Finite Degree Of Freedom (FDOF) model of Multi Rigid Bodies (MRD) for flexible leg of micro robot. Modal analysis of continuum model and FDOF model of MRD for flexible leg is conducted in ANSYS and ADAMS software environment respectively. Analysis results show that the two model have similar lower nature frequency and vibration modes, which verified the correctness of the FDOF model and its establish method. Based on FDOF model, the equivalent drive model of piezoelectric bimorph and system dynamic model of micro robot are build, which provides a theoretical basis for dynamic analysis of the micro robot.
Numerical Simulation for Geotechnical Material of Mine Stope by Mechanics and Deformation Performance
Authors: Xie Xiong Gang , Xu Shi Qing , Dai Zhang Yin
Published: February 2012

This paper is focused on the mechanics and deformation performance of mine stope after excavation. The deformation performance is described by the settlement of stope roof, and the mechanics performance is described by the plastic zone of rock mass surrounding stope. The numerical calculation software FLAC3D is used to simulate the deformation and failure situation of the rock mass surrounding complicated large underground stope. In the calculation, the excavation procedure for the stope is simulated. The mechanical method has been adopted to establish the analysis on the stope stability, the results are in accordance with the actual situations, and can help to more accurately predict location of failure. The conclusion can give some guidance for the real practice.
Sintering of High-Density AlN Ceramics at High Pressure
Authors: Zuo Gui Hong , Liu Yan Feng , Ma Yan Ping , Wu Chun Lei , Zheng You Jin
Published: February 2012

High-density AlN ceramics were fabricated under high pressure, in a cubic anvil high-pressure and high-temperature apparatus. This work provided that the method is capable of producing high-density AlN ceramics at a sintering temperature as low as 1300°C in a relatively short sintering time. And the growth model of AlN ceramics was pointed out and the proper explanation of its related phenomena were given in detail in this paper.
Effect of Magnetic Field on the Electropolymerization and Corrosion Properties of Polyaniline (PANI) Film
Authors: Dong Chao Fang , Yang Yang , Luo Hong , Xiao Kui , Li Xiao Gang
Published: February 2012

The polyaniline have been prepared in the absence and presence of magnetic field by the technique of cyclic voltammetry (CV) on 304-stainless steel electrode in H2SO4 aqueous solution of aniline (Ani). The influence of magnetic field on electropolymerization of PANI was investigated by electrochemical properties, FT-IR spectra, X-ray diffraction (XRD) and microstructure. The results indicate that the effect of magnetic field on the polyaniline is positive.
Finite Element Optimization Design on the Back Frame of the Jaw Crusher PC5282
Authors: Guo Sheng , Huang Wei Ping , Guo Nian Qing
Published: February 2012

According to the main parameters of the jaw crusher PC5282, structure of the back frame was designed, and three-dimensional model of the back frame was also set up. Finite element analysis of the back frame under static load was done in COSMOSWORKS. The distribution laws of stress, displacement and deformation were revealed. Optimization design was also finished, and the weight of the back frame was reduced.
Research and Development of the Porthole-Die Aluminium Alloy Extrusion Processes
Authors: Lou Shu Mei , Xiao Lin Jing
Published: February 2012

The current research on the porthole-die aluminium alloy extrusion is presented here. The empirical method and simulation method are analyzed. Particularly, the Lagrangian Finite Element Method(FEM), Eulerian Finite Volume Method(FVM) and Arbitrary-Lagrangian Eulerian(ALE) algorithm are compared. The development of the porthole-die aluminium is educed.
The Study of the Relation between Clearance and Fine-Blanking Quality
Authors: Wang Yi Min , Wen Li Min , Wang Xian Cai
Published: February 2012

a numerical model research of fine-blanking has been built up. The fine-blanking process of parts with clearance 0.1%S, 0.7%S, and 1.3%S. (S stands for the thickness of the material) respectively, thickness of plate 2.9mm and diameter 16mm of steel 45, has been simulated. Through simulation, the study gets the material distribution situation of mean-stress fields in the progress of fine-blanking, and the author analyzes the relation between mean-stress fields and the crack of shearing zone. Through analysis the author concluded that the section quality grows with decrease of blanking clearance.
Internal Contour Extraction Algorithm Based on Quadratic B-spline for Images of Hot Long Shaft Forgings
Authors: Li Zhe Lin , Xia Qin Xiang , Pan Yong , Wu Zhi
Published: February 2012

It is necessary that the internal and external contours are extracted from the image of hot long shaft forgings, while the forgings are measured by CCD measurement method. In the light of the blurry internal edges in the image of the hot forging, a method based on quadratic B-spline curve is employed to extract feature points. In order to remove the pseudo features, a method based on maximum correlation is presented. In accordance with continuity of the internal contours, quadratic B-spline curve is used to fit the internal contours. Experiments show that this algorithm can effectively extract accurate internal contours for images of hot squaring and chamfering forgings. The extracted contours could provide basic data for subsequent 3D reconstruction and geometric measurements.
Tardiness Scheduling with Fuzzy Processing Time Using Tabu Search
Authors: Yang Hong Bing , Li Wen Chao , Guan Xian Ping , Zhou Fei
Published: February 2012

In this paper, we address unrelated parallel machines scheduling problem with fuzzy processing times considering the minimization of the total tardiness cost. The tardiness credibility index of jobs is given to estimate the possibility of job’s tardiness, and a mixed integer programming model (MIP) is formulated for total tardiness cost based on fuzzy theory. Solving the MIP problem is NP-hard, thus a tabu search is designed to solve such a difficult problem. The results of computational test show the feasibility and effectiveness of the developed model and algorithm.
Study on the Magnetic Flux Leakage (MFL) for Fillet Weld
Authors: Guo Chun Fei , Wang Li Jun , Zhang Min
Published: February 2012

The magnetic flux leakage (MFL) technique is widely used as a Non-Destructive Testing (NDT) method for welds [1]. Because of the specialty of fillet weld structure, the defect may not be in the location suitably detected, which is normally at the center of yoke poles, and the rate of detect-ability would decline. In this paper, we focus on the yoke-magnetization testing for a fillet weld, and it is studied the influences of air gap between magnetic poles and specimen surface on MFL density at an artificial flaw by Finite Element Method (FEM), and also the influences of distance between magnetic poles and fillet weld on MFL density. The results show that the MFL density observably decreases as the air gap and the distance increase.
Profile Study of Formed Milling Cutter for Screw Based on Non-Instantaneous Envelope Method
Authors: Fan Jin Wei , Li Yun , Wang Xiao Feng
Published: February 2012

Through analyzing the shape of screw of oil extraction progressing cavity pump, the spiral surface equation of screw was established; and from the relative motion between formed milling cutter and screw, the basic profile equation of formed milling cutter was established with the method of non-instantaneous envelope. According to the actual use of formed milling cutter, aim at the problem of wear for formed milling cutter, established profile equation of front cutting edge and constant back cutting edge, and finally to get a complete profile equation of formed milling cutter. The correctness of milling cutter profile is ensured by interference checking for profile equation of formed milling cutter. The profile equation of formed milling cutter provides a theoretical foundation for the design and manufacture, and it would have great significance to the actual production.
Design and Analysis of the Multi-Microchannel Aerostatic Restrictor
Authors: Zhang Yu Bing , Zhang Wen , Li Dong Sheng
Published: February 2012

Restrictors are one of core parts in aerostatic systems. A special multi-microchannel aerostatic restrictor is designed and developed, and the air film thickness is measured by the capacitive measuring method. The mathematical model of capacitance and air film thickness is carried out, capacitances of specific air film thickness are calculated, air film thickness of the multi-microchannel aerostatic restrictor with the overall diameter is measured, and error sources processed and analyzed. Results illustrate that errors between the theoretical calculations and the experimental data are less than 13%, this proves the correctness of the mathematical model as well as the effectiveness of the capacitive measuring method applying for the air film thickness measurement of the aerostatic systems.
Preliminary Analysis of Sustainable Design Management for LSPB
Authors: Shi Qian , Huang Rui
Published: February 2012

Large-scale public building (LSPB) is different from general industrial and civil construction, so that some special management methods are attained to handling the complex design environment based on sustainable development theory. Including organization model, design checklist and some interface design management principles are raised in this analysis.
The Fabrication and Inspection of a Microball Made of Optical Fibre for Micro-Nano Coordinating Measuring Machine
Authors: Zhao Jian , Huang Qiang Xian , Huang Shuai
Published: February 2012

The manufacture of micro-nano three-dimensional (3D) probe is a key factor for Micro-nano Coordinating Measuring Machine (Micro-nano CMM) to achieve the precise measurement. This paper proposes a method to fabricate a microball from an optical fibre using a fibre fusion splicer, which is used for Micro-nano CMM to measure miniature workpieces. Utilizing fused optical fibre tapering and choosing proper melting parameters, a microball with diameter of about 100μm and with roundness of less than 2μm could be fabricated. The offset distance between the microball centre and fibre stylus central line due to the gravity effect could be less than 1μm. This approach not only greatly reduces the time for the preparation of the probe, but also extends micro-nano CMM’s capability of measuring miniature workpieces.
Novel Additive for Alkaline Texturing of Mono-Crystalline Silicon
Authors: Zhou Su , Zhou Chun Lan , Yang Lei , Wang Wen Jing , Tang Ye Hua , Chen Jing Wei , Yan Bao Jun , Zhao Yan
Published: February 2012

Isopropyl alcohol(IPA) is widely used as additive to enhance surface structure and reduce the reflectivity of silicon wafers in alkaline texturing process of mono-crystalline silicon solar cells currently. However, due to its low boiling point and high volatilization, some negative effects are brought into large scale production especially in stability, cost and environment. In this paper, Dipropylene glycol(DPG) which has relative high boiling point was tried to substitute IPA as texturing solution additive. The influences of concentration of DPG and NaOH on etching rate, surface morphology and reflectance spectrum were investigated. It is obviously observed that the silicon is prevented from etching reaction by the existence of DPG. The best weight reflectance of 13.6% is obtained on mono-crystalline silicon surface by an optimized solution of 1 wt% NaOH and 1 wt% DPG at 80°C for 20 minutes. Finally, the influencing mechanism of DPG was also discussed in detail.
Model Building and Interface Friction Research of Micro Cutting
Authors: Ding Hong Jun , Wang Xi Bin , Fang Zhe Ping , Liang Zhi Qiang
Published: February 2012

It analyses deeply the diffrence between micro cutting and conventional machine cutting from the mechanism of cutting surface formation in this paper, and building the micro cutting model , then analyses friction mechanism of micro cutting processing introduce a new micro friction model, this paper discusses interface micro friction characteristics in the process of micro cutting.
Theoretical Analysis of Laser Shock Bulging Forming
Authors: Zhang Guo Fang , Ji Zhong , Liu Jing , Zheng Chao , Zhang Jian Hua
Published: February 2012

Laser shock forming (LSF) is a novel plastic forming process which utilizes high-pressure plasma to deform thin metals to 3D configurations. The plastic response of a circular plate in laser shock bulging forming was theoretically studied. A simplified shock pressure model was established and then an analytical model was proposed to calculate the deflection. The results show that the deflection increases with increasing pulse energy and the deformation profiles calculated by the analytical model agree well with those of experiment.
Minimum Zone Evaluation of Flatness Error Using an Adaptive Iterative Strategy for Coordinate Measuring Machines Data
Authors: Ye Rui Fang , Cui Chang Cai , Huang Fu Gui , Fan Wei , Yu Qing
Published: February 2012

In this paper, an adaptive and iterative neighborhood search strategy is proposed to precisely evaluate the flatness error. Firstly, an initial datum plane produced by least squares method (LSM) is calculated. And then, a group of candidate planes are generated by adjusting the direction angles of the LSM datum plane. The flatness errors conform to the minimum zone condition for each candidate datum plane that can be worked out. The one with minimum flatness error will be selected as the new start plane for the next search. The new search area is the zone between the new and old datum planes, with which the new search step is computed until the terminal condition is met. Numerical examples are given to validate the proposed strategy. The results show that the proposed method could get the precise value of the flatness error from the data of coordinate measuring machines and other equipment.
Fabrication of Minitype Cutting Tool Based on the Electrode Dressing Technique
Authors: Jiang Fang , Liao Wen Min
Published: February 2012

Based on the electrode finishing technique in electrical discharge machining (EDM), a new method is proposed in the article to fabricate minitype cutting tool efficiently. The research on the techniques to attain the minitype cutting tool was based on analyzing the feature of EDM on minitype cutter. The process of fabrication for minitype cutting tool is determined, and the minitype grooving tools with the characteristic sizes of 70 μm were made of two types of materials. This fabrication method proved to be applicable to high efficiency fabrication of minitype cutting tool. The factors affecting precision of minitype cutter were analyzed, the causes for worse shape precision and surface roughness were described specifically, and the suggestions to improve the machining quality were proposed.
Research on Remanufacturability Index System and Evaluation Method of Electromechanical Products
Authors: Zeng Shou Jin , Liu Zhi Feng , Jiang Ji Bin
Published: February 2012

In view of the problem that the remanufacturability evaluation index is imperfect in current study, the evaluation index system and the quantitative methods including environment, resource, energy, economy and technology is established. The evaluation method of the remanufacturability based on fuzzy AHP is proposed for the electromechanical products. Finally, an evaluation example of a type of automobile engine is provided to verify the feasibility and practicality of this method.
Study on the Microstructure and the Mechanical Properties of TA2
Authors: Hu Xiao Dong , Zhang Sen , Zhang Yong , Li Ya Jiang
Published: February 2012

The microstructure and the mechanical properties of welding joint with the material of TA2 have been studied in this paper with the specimens made with the method of argon-arc welding. The microhardness of the welding joint has been compared with the hardness in the same position of the weld joint after annealing. Conclusions have been obtained as follows: The organizations of the welding joint include base material, recrystallization zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as M-shape with the softest point located at the center, and the hardest is located at the overheated zone; the annealing treatment can enhance the weld joint hardness mainly at the center, and the hardness of other zones change little.
The Effect of Surface Finish on Zinc Whisker Growth
Authors: Cui Wen , Qi Shao Jun
Published: February 2012

To understand the relationship between surface finish and zinc whisker growth, this study investigated the growth of whiskers on two mild steel substrates of different surface finish by Field Emission Gun Scanning Electron Microscope (FEG SEM). Results show that, under the same experimental conditions, deposits on substrates with a mirror finish grew less whiskers and nodules than substrates with a rough surface finish.
Study on Microstructure and Wear Properties of (Ti,W)C/Fe Surface Composite Coating
Authors: Wang Jing , Fu Si Jing , Jiang Bing Hua , Wang Yi San
Published: February 2012

(Ti,W)C particles reinforced Fe-based surface composite coatings were fabricated by in-situ synthesis and powder metallurgy route. The microstructure, interface and wear properties were investigated by X-ray diffraction, scanning electron microscopy and dry sliding wear test. The results show that (Ti,W)C carbides form via in situ reaction between titanium, ferrotungsten and graphite. The morphology of (Ti,W)C is mainly rectangular form. The interface between (Ti,W)C and iron matrix is found to be free from cracks and deleterious phases. The coating reinforced by (Ti,W)C particles possesses higher wear resistance than that of the substrate.
Transverse Vibration Analysis of Buried Pipeline under Fluid-Solid Coupling Interaction
Authors: Hao Ting Yue
Published: February 2012

The pipe model is simplified as elastic foundation beam model of Euler-Bernoulli, the form of pin rocker bearing in the analysis of transverse vibration in the paper. According the principle of Hamilton, after a series of variation, exchanging the order of integral and integration by parts, the transverse vibration differential equation of pipe is obtained without fluid. Considering different boundary consitions, the solving process is carried out. By utlization of MALAB language, the numerical example is analyzed, considering fluid and foundation. Thus, the fluid-solid coupling interaction is not ignored in transverse vibration in the buried pipeline.
The Development of Novel Electrolyte Membrane with High Proton Conductivity at Medium Temperatures
Authors: Wang Xue Dan , Yang Le Bin , Liu Jia Bin , Huang Yue Xiang , Shen Hang Yan , Shu Kang Ying
Published: February 2012

A novel electrolyte membrane PVDF-Al2O3-CsHSO4 usable at medium temperatures was prepared by composite of PVDF and an inorganic proton conductor Al2O3-CsHSO4. The membrane has a steep increase in proton conductivity around 90°C and retains the high conductivity, about 10-3 S•cm-1, up to 200°C. The incorporation of Al2O3-CsHSO4 with PVDF leads to a dramatic improvement of the properties of PVDF, including widen the phase transition temperature of CsHSO4, improve proton conductivity and enhance chemical stability over wide temperature range.
A Linear Piezoelectric Linear Motor Driven by the in-Plane Longitudinal and Bending Vibrations of an H-Shaped Vibrator
Authors: He Hong Lin , Wu Dong Mei , Liu Wen Guang
Published: February 2012

In order to develop theoretical instructions for design of high performance linear motor, a piezoelectric linear motor based on an H-shaped vibrator is proposed, which employed the vibrator’s 2nd bending vibration mode and 1st longitudinal planar vibration to drive the motor in this paper. Firstly, the driving principle of the motor is presented, and the elliptical motion generated on the driving end of the vertical bars of the vibrator is proved. Then, FEM simulation model is built for the vibrator, which is used to calculate the vibrator’s working modes and to execute harmonic response analysis and sensitivity analysis for the vibrator. Furthermore, the vibration’s optimal size is given and the motor assembly structure is designed. Finally, modal test is done for the vibrator to validate the anticipated work modes vibration and the bending vibration and longitudinal planar vibration could be 1.4μm and1.2μm under normal drive.
Preparation and Characterization of Liquefaction Polyol of Wheat-Straw Lignocellulose
Authors: Jin Yan Qiao , Zhang Yi Zhuan , Cheng Xian Su
Published: February 2012

In this study, wheat-straw lignocelluloses were liquefied in liquefaction solvents. Polyethyleneglycol 400 (PEG 400) and ethylene glycol (EG) were used as main liquefaction solvents. The effect of liquefaction time and liquefaction solvents on the properties of liquefied products was investigated. As the reaction time increased, the hydroxyl value, residue content and viscosity decreased, and the acid value decreased gradually in the previous period of time then increased. The optimum liquefaction conditions were as follows: wheat-straw lignocelluloses with steam-explosion pretreatment, the main liquefaction reagent of PEG 400, auxiliary liquefaction solvents of glycerin, catalyst of sulfuric acid, liquefaction temperature of 150°C, liquefaction time of 4 h. The hydroxyl value of liquefaction product was 206 mgKOH/g, the residue content was 0.19% and the viscosity was 88 mPa•s.
Wealth Distribution in a Local-World Network
Authors: Lan Lu , Gao Qi Sheng , Yang Yan Yan
Published: February 2012

We study the flow of money among agents in the local-world network with yard-sale model and aggressiveness. The system allows money trade between two agents and a time during the evolving of the model, betting a fraction α of the loser’s agent wealth. b parameterizes the significance of the relative wealth of the agents. According to analysis the wealth distribution with b>0,b=0 and bis the most important index of system structure. The computation and simulation results tell us that Gini coefficient is growing up gradually as increasing of . These results can offer effective approaches for our country to establish useful measure and policy to relax the unequal distribution of wealth.
The Improvement of Anticorrosive Technology for Pipeline in Panjin Oilfield
Authors: Tang Li Ming , Bi Wen Jun
Published: February 2012

The anticorrosive work for pipeline is a long-term basic work. It is significant for us to lengthen pipeline working life and enhance the operation reliability. In this article, the corrosive status in quo and reasons for pipeline in Panjin oilfield were narrated. In accordance with the corrosive characters, the new anticorrosive coating that epoxy heavy anticorrosive over-rust primer/IPN topcoat was opened up. In the lab, the anticorrosive coating by analyzed with electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The corrosion behavior of the new anticorrosive coating was compared with that of the traditional asphalt paint. The conclusion is that the epoxy heavy anticorrosive over-rust primer/IPN topcoat is superior to asphalt paint in anticorrosive properties.
Study on Grinding Mechanism of BCB Grinding Wheel
Authors: Li Wei , Hong Yang , Jin Liang Sheng
Published: February 2012

BCB(Bamboo Charcoal Bonded) grinding wheel is a new kind of grinding wheel developed by bamboo charcoal-phenolic resin composite for ELID(Electrolysis In-process Dressing) grinding technique. To study the affection of the ground workpiece surface roughness and removal rate with this new kind of grinding technique, the stainless steel SUS304 was ground using BCB grinding wheel in different machining parameters with ELID grinding condition, and the machining characteristics of BCB grinding wheel has been researched. The experimental results indicated that the ground workpiece surface roughness can be reached to Ra 0.010μm, and the efficient and precision machining with BCB grinding wheel by ELID grinding technique has been achieved for hard-to-cut materials. Finally, by studying of the grinding wheel surface condition and wear, the BCB grinding wheel grinding mechanism has been preliminary discussed.
Stability Analysis in a Delayed Predator-Prey Model
Authors: Jiang Zhi Chao , Chen Hui
Published: February 2012

A stage-structured predator-prey system with time delay is considered. By analyzing the characteristic equations, the local stability of a positive equilibrium and a boundary equilibrium is discussed, respectively. Furthermore, it is proved that the system undergoes a Hopf bifurcation at the positive equilibrium when . The estimation of the length of delay to preserve stability has also been calculated.
Internet Technologies and Construction Management
Authors: Liu Nan , Xu Mao Zeng , Liu Long
Published: February 2012

Construction industry is one of the most information-intensive industries. It is also fragmented and complex which often causes poor information management. As a result, it has serious adverse effects for its efficiency and productivity. Internet technologies have now been regarded potential in resolving the issues. This paper aims at discussing the chance that Internet technologies can provide. It also further discusses some possible applications and tools that can be integrated to improve the information management in construction.
Process Modeling of Virtual Enterprises Partner Selection Based on Petri Net
Authors: Huang Bin , Ma Ning Ning , Chen Liang
Published: February 2012

Partner selection process is a major issue in the formation of a virtual enterprise. This paper analyzes the partner selection process of a virtual enterprise and provides its model based on Petri net. The model describes the dynamic behaviors such as concurrent, asynchronism among the factors in partner selection process. In addition, paper analyzes the liveness of the process model by means of the reachability tree.
Automatic Defect Detection of Yarn-Dyed Fabrics Based on Energy Fusion and Local Binary Patterns
Authors: Li Wen Yu , Cheng Long Di , Xue Wen Liang
Published: February 2012

For the purpose of realizing fast and effective detection of defects of yarn-dyed fabric, and in consideration of the inherent characteristics of texture, i.e., color and structure, an approach for automatic defect detection is proposed in this paper. The image of yarn-dyed fabric to be enhanced is first converted from RGB true color space to L*a*b* color space. Then Log-gabor filters filter chromatic and brightness channels, and energy feature images are acquired after energy is fused between chromatic and brightness. Finally defects of yarn-dyed fabrics can be detected on the energy feature images using local binary patterns. The proposed method can detect colored and structural flaws. Experimental results for the defect detection from six kinds of yarn-dyed fabrics indicate that a high detection rate is achieved for the proposed method. It is fast enough to be possible for real-time application.
Online Estimation System of Grinding Wheel Status Based on D-S Evidence Theory
Authors: Bi Guo , Guo Yin Biao , Zheng Mao Jiang , Lin Jing , Han Wei
Published: February 2012

Automated quality control of aspheric optical lens is a development tendency of precision grinding manufacturing in the near future. Grinding wheel status changes as the grinding time elapses and it has a close relationship with the ground surface. Therefore, an online estimation system of grinding wheel status is studied and established in this paper in order to judge the wheel’s life-cycle automatically and dress it in a proper occasion. Several representative process quantities are selected and characters of the dynamical signals are abstracted to provide all-around information about the evolvement of grinding wheel status. Dempster-Shafer evidence theory is employed by the estimation system to acquire a reliable decision about grinding wheel status.
Registration of 3-D Shape with Free-Form Surface Using Imageware and Genetic Algorithm
Authors: Wang Xiao Yi , Chen Jing , Zhu Jiang , Saito Yoshio , Tanaka Tomohisa
Published: February 2012

Registration of 3-D shape is significant in quantizing the error between the part and its CAD model and evaluating the part's manufacturing accuracy. In the past, various improved methods of the iterative closest point (ICP) had been proposed in registration. However, without fine initial pose of point clouds, the ICP algorithm often could not converge to the best (or near best) solution. According to the characteristics of 3-D shape with free-form surface, a new method for registration of 3-D shape with free-form surface is given, by which there are not rigid requests in initial pose of point data and the 3-D shape model could be in arbitrary positions and orientations in space. To improve the efficiency and accuracy of solving, this method is divided into general registration and fine registration. General registration is to fit rapidly and roughly the measured point cloud to designing point cloud from CAD model by Imageware. Fine registration is to further accurately fit the two group points using genetic algorithm (GA). Case study is finally given for a work piece with free-form surface to show the effectiveness of the above method.
Quality Cost Analysis Based on PVA and EVA
Authors: Liu Wei Wei , Li Lan
Published: February 2012

Based on the relation of the operating resource consumption, the capital cost and the motivation of quality cost, this paper proposed that the cost for improving product quality in the capital cost was regarded as a part of the quality cost, from this the quality cost was re-defined. And in order to distribute and control the quality cost reasonably, the paper based on the evaluation system of EVA, used PVA to assign the quality cost into the various stages of production.
Yard Allocation for Coal Terminal Based on Rules
Authors: Wang Yu , Mi Wei Jian , Chang Dao Fang
Published: February 2012

The paper has studied the allocation strategy according to the cargo in the bulk terminal because yard is the important resource in terminal. Coal is the typical goods in bulk terminal, so the rules are extracted in this paper from the character of coal, management principles of coal terminal and the characteristics of equipments. Then the yard allocation model based on rules is designed. It can choose the suitable position to put the coal in the yard by three steps which are available positions acquiring, equipment and yards matching, suitable position choosing. The production efficiency and the rate of yard utilization are improved by using this model. At last a case is tested by the simulation in order to prove that the method designed in this paper is useful.
Research on Manual Scheduling Technology Using the Pattern of Human-Computer Cooperation
Authors: Li Jing Sheng , Wang Ai Min , Tang Cheng Tong , Lu Zhi Bing
Published: February 2012

The automatic scheduling is not suitable for manufacture in most case, because it cannot fully utilize the experience of the operator and effectively response the disturbance events from the production progress. In order to solve these problems the manual scheduling technology using the pattern of human-computer collaborative is proposed. The graphical scheduling block has been discrete through applying the kernel methods including the combination of multi-layer displaying of Gantt-Chart, the model of machine calendar, mouse selected mechanism and auxiliary function for manual scheduling. By building multi-layer normative modular manual scheduling operations, we divide the manual scheduling operation into three steps: the selection of manual scheduling process, the selection of the inserting base, and the inserting mode. At the same time constrains transferring mode provoked by the three kinds of inserting mode is analyzed. By controlling constrains in the progress of the manual adjustment makes sure that the manual scheduling result meets the demand of job shop production. Finally, the algorithms in this paper are validated by the software developed with C++.
Difficulties of E-Commerce Application in Small and Medium Enterprises
Authors: Zheng Qi , Wang Ting Ting
Published: February 2012

E-commerce has been particularly influential in the development of small and medium-sized enterprises (SMEs). Along with globalization, information and communications technologies are the best that we have as agents of change among developed economies as well as developing and underdeveloped economies. This paper seeks to understand E-commerce adoption and usage by small and medium-sized enterprises. This paper provides an overview of the study and the research design of the project. It begins with a background to the research, statement of the problem, the significance and concludes of the study.
Simulation of Stock Strategies in Dynamic Supply Chains
Authors: Li Jing , Liu Wei
Published: February 2012

This paper is focused on the study of (T, S) stock strategies in dynamic supply chains. The dynamic supply chain means the retailer can change his suppliers in every purchase period for more profits. Four categories of two-stage supply chain structures consisting of multiple suppliers and a single retailer are considered. Two categories of auction mechanisms, single-winner or multi-winner auction, are used in this paper. A multi-agent model is developed to study these four categories of supply chains. The results of experiments show that, with the decrease of safety stock, the tendencies of the retailer’s profit are changed under different structures. Also, the optimal (near-optimal) safety stock, corresponding to the maximum profit, shows significant difference under different structures. The results of this paper demonstrate that the safety stock can be significantly changed and financial benefits can be achieved while working under different supply chain structures with (T, S) strategy.
PMIS Service Providing through SaaS Structure
Authors: Zhou Kai , Bao Li Wei
Published: February 2012

SaaS is a fast growing software concept. There had been some successful software provided through SaaS model as CRM and ERP. Both domestically and internationally, companies achieve great success by using SaaS model, such as Salesforec.com, 800App.com etc… But project management as a very promising SaaS application, has not been fully understood. In this article we propose the concept to provide PM through SaaS model, and we further propose a structure to support our point of view.
The Effectiveness of Environmental Regulation on Manufacturing Productivity in Jiangsu Province
Authors: Shen Dan Yun , Zhang Hui Ming
Published: February 2012

The impacts of environment regulation on production efficiency of manufacturing industry in Jiangsu province are analyzed based on DEA model. Results indicate that environment regulation has a positive impact for the whole manufacturing industry, but complex effects among the different cities. Nanjing, Lian Yungang and Taizhou enter the efficiency frontier when regulation is implemented; while the manufacturing industry of Huai’an and Zhenjiang drop in the technical efficiency. Finally this paper offers relative suggestions.