bluuebunny/crossref_metadata_2025 huggingface dataset:
Sol-Gel Derived Titania/Hydroxyapatite Layer on Titanium Substrate
Authors: Wang Wen Yan , Wu Yu , Xie Jing Pei , Lu Gao , Dong Xiao Ming , Yu Hui Wu
Published: October 2011

In this study, calcium nitrate(Ca(NO3)2•4H2O) and phosphorus pentoxide(P2O5) were used as precursor to prepare hydroxyapatite(HA) layer by sol-gel method, followed by a dipping-coating method to coat HA layer onto Ti. Phase formation and microstructure were investigated by XRD and SEM to study the influence of atmosphere on the property of HA layer. The results revealed that there exists no large cracks in the layer which was heated in the nitrogen, leading to a good surface quality compared with the layer which was heated in the air. And there is no obvious difference in crystallinity and volume fraction of HA in the layer when adopting heat treatment in different atmospheres.
Static Stress and Modal Analysis of the Impeller of the High-Pressure Low-Flow Pump
Authors: Li Bao Liang , Zhang Heng Feng , Lei Zang
Published: October 2011

Based on the design conditions,the structure strength and modal analysis are carried on the impeller by One-way Fluid-structure Interaction technique in ANSYS Workbench platform. The results show that under the water stress, the maximum deformation occurs on the brink of the blade, the maximum equivalent stress occurs at the liner near the blade pressure surface, the deformation of the blade has a great influence on the vibration of the pump.
Scalability Study on Large-Scale Parallel Finite Element Computing in PANDA Frame
Authors: Fan Xuan Hua , Wu Rui An , Chen Pu
Published: October 2011

A Finite-element parallel computing frame—PANDA and its implementation processes are introduced. To validate the parallel performance of the PANDA frame, a series of tests were carried out to obtain the computing scale and the speedup ratios. First, three different large-scale freedom degree models (i.e. 1.83 million, 7 million and 10 million) of a typical engineering clamp were created in MSC.Patran and were translated into geometric-grid files that can be identified in PANDA frame. Second, Linear static parallel computations of the three cases were successfully carried out on large parallel computers with preconditioned conjugate gradient methods in PANDA frame. The speedup ratios of the three cases were obtained with a maximum process number of 64. The results show that the PANDA frame is competent for carrying out large-scale parallel computing of 10 million freedom degrees. In each scale，the parallel computing is nearly linearly accelerated along with the increase of process numbers, moreover, a super-linear speedup appears in some cases. The speedup curves show that the linear degree increases when the computing scale enlarges. The influence of different communication bandwidths on computing efficiency was also discussed. All the testing results indicate that the PANDA frame has excellent parallel performance and favorable computing scalability.
Heat Transfer Enhancement of Viscoelastic Fluid in the Rectangle Microchannel with Constant Heat Fluxes
Authors: Zhou Guo Fa , Peng Ting
Published: October 2011

It has been found that viscoelastic fluid has evident heat transfer enhancement function in macro scale. But in micro scale, viscoelastic fluid’s flow and heat transfer characteristics are still unknown. In this paper, the heat transfer process of viscoelastic fluid in the microchannel is studied by numerical simulation method. The simulation results show that the maximum heat transfer enhancement of viscoelastic fluid is up to 800%, compared with pure viscous fluid. The viscoelastic fluid has such obvious heat transfer enhancement function because of its strong secondary flow. Laminar sub-layer can be damaged by the strong secondary flow, and thus radial flow generates in laminar sub-layer. The radial flow can increase the interference and mixing effect, and enhances fluid’s turbulence and convection which can enhance heat transfer as a result. So the heat transfer enhancement depends on the intensity of secondary flow which is caused by the second normal stress difference, and it will increase with the raise of the flow rate.
The Effects of Flexible Deformation on an Oscillating Airfoil at Low Reynolds Number
Authors: Wu Jiang Hao , Zhou Chao , Zhang Yan Lai
Published: October 2011

The objective of investigation is to use numerical simulation obtain the effect of three different flexible deformation parameters (the maximum deforming amplitude, the phase difference between the plunging motion and the deformation motion and location of the maximum deforming) on unsteady aerodynamic performance of an airfoil with plunging and pitching motion. It is shown the effect of flexible deformation at low Reynolds number is obvious. The effect of the maximum deforming amplitude and the phase difference on aerodynamic forces is quite significant while the time courses of CL and CT don’t almost change with location of the maximum deforming. Different deforming amplitude and the phase difference may be advantageous or disadvantageous for averaged aerodynamic forces. Larger phase difference can produce more thrust and make the forward flight faster. Compared with the rigid airfoil, the appreciate combination of deformation parameters is beneficial in MAV design.
Hydraulic Model and Numerical Simulation Study of Shuangwangcheng Pump Station
Authors: Li Chuan Qi , Wang Wei , Gong Jie , Zhao Xin Lai
Published: October 2011

Physical and numerical model studies were performed in order to study the flow conditions for the proposed pump station of Shuangwangcheng reservoir, Shouguang Ctiy. The flow velocity and the pressure distribution in the bidirectional culvert of Shuangwangcheng Pump Station had been obtained by hydraulic model test and numerical simulation. The physical model was constructed to a Froude scale of 1:20. A general conclusion was that, the computed results were good agreement with the data measured in physical model, and could be good complement for physical model test. Furthermore, negative pressure existing in discharge steep culvert in the initial scheme design was eliminated by moving the culvert controlling gate to the end of culvert in the modified scheme, and the flow conditions was improved.
Preparation of Ni-Coated SiC Ceramic Composite Powder by Electroless Plating
Authors: Yao Huai , Zhu Guang Lin , Wang Yong Zhi
Published: October 2011

As a surface technology, electroless plating is applied to almost every industry branch. To improve the wettability of SiC powder and metal, the surface of SiC powders was plated with a Ni plating in the basic solution according to the reaction theory of electroless plating. The main salting was nickel chloride, and the reducing agent was hydrazine hydrate. The plating velocity, phase transformation and microstructurewere investigated using XRD and SEM. The results show that the SiC powders had no increasing weight and no reaction can occur when the pH below 8.5. when the pH value was between 10 and 11, the weight gain of powders closed to the theoretical value, the Ni peaks in X-ray diffraction patterns of powders was relatively strong, the SiC coating surface was composed of granular, cellular and globe-like Ni, the substrate was covered of Ni plating completely. When the pH value was above 11, the gas production was becoming more pronounced and the reaction speed increasing with the increased of the pH value, the time from deep blue to colorless of solution started to drop off, the Ni(OH)2peaks in X-ray diffraction patterns of powders have already begun to emerged and a small amount of nickel films was generated.
Characterization and Visible-Light Photocatalytic Activity of Nano-Bi2MoO6 Catalysts Prepared by Hydrothermal Process
Authors: Tang Pei Song , Chen Hai Feng , Cao Feng , Pan Guo Xiang , Xu Min Hong
Published: October 2011

The Nano-Bi2MoO6was prepared using Bi(NO3)3•5H2O and Na2MoO4•2H2O as starting materials by a hydrothermal process. The prepared Bi2MoO6product was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). It was found that the prepared nano-Bi2MoO6show narrow band gap of 2.88 eV. Consequently, the prepared nano-Bi2MoO6show high visible-light photocatalytic activity for decomposition of Rhodamine B in comparison with the commercial Degussa P25, which was ascribed to the visible-light absorption.
Synthesis of Silver-Modified Sponge-Like Titanium Dioxide Arrays with Biomimetic Structure and its Enhanced Photocatalytic
Authors: Lu Yu Jun , Mei Jie , Dong Wen Jun , Fu Jing Li , Li Chao Rong
Published: October 2011

The silver-modified sponge-like titanium dioxide arrays were prepared by a hydrothermal method. The effects of the hydrothermal reaction temperature, template agents were studied. The obtained products of Ag/TiO2arrays were investigated by scanning electron microscope in combination with X-ray diffraction. Results show that polyvinylpyrrolidone plays a key role in the formation of titanium dioxide arrays. Compare to the commercial P25 (Degussa), the optimized TiO2 array-structures exhibit an obvious enhanced photocatalytic activity, that enhancement is attributed to its sponge-like biomimetic structure and silver modification. The products have potential applications in degrading organic pollutants.
The Role of Alum in the Fabrication of Calcium Silicate for Dissolved Acetylene Cylinders
Authors: Cui Shi Cai , Meng Zhao Bo
Published: October 2011

Calcium silicate for filling material used in dissolved acetylene cylinders was prepared by adding alum as additive. Samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of alum on the bleeding, shrinkage, strength, porosity, morphology and phase composition were studied. The experimental results show that the adding of alum can improve the comprehensive performance of samples. The mechanism was discussed in detail.
Nonlinear Response of Carbon-Carbon Composite Panels Subjected to Thermal-Acoustic Loadings
Authors: Sha Yun Dong , Xu Fei , Gao Zhi Jun
Published: October 2011

Carbon-Carbon composite materials are widely used as the surface thermal protection systems (TPS) of advanced high-speed air-craft and spacecraft. The thin-walled structures with this kind of materials would exhibit large displacement response under high-level acoustic loads and possibly display buckling at elevated temperatures. Reliable experimental data are difficult to acquire because of the high costs and difficulties with instrumentation at high acoustic intensity and elevated temperatures. Thus, in the design process greater emphasis will likely be placed on improved mathematical and computational prediction methods. Among these researches, the simulation methods for nonlinear response of thin-walled composite panels under thermo-acoustic loadings are being developed emphatically .This paper presents a nonlinear finite element model for analyzing nonlinear random dynamic behaviors of Carbon-Carbon composite panels under the combined effects of thermal and random acoustic loads. The acoustic excitation is assumed to be a band-limited Gaussian random noise and uniformly distributed over the structural surface and the thermal load is assumed to be a steady-state with different predefined temperature distribution. Three types of motion: 1) linear random vibration about one of the two buckled positions, 2) snap-through motion between the two buckled positions, and 3) nonlinear random vibration over the two thermally buckled positions can be predicted. And the dynamic response behaviors of the structures are discussed. Based on this, the influences of sound pressure level (SPL) and elevated temperatures on the dynamic responses are analyzed emphatically.
Hot Deformation Behavior of Al2O3/Cu-10vol%WC Composite
Authors: Feng Jiang , Tian Bao Hong , Liu Yong
Published: October 2011

The hot deformation behavior of the Al2O3/Cu-10vol%WC composite is investigated by isothermal compression test on a Gleeble 1500D thermal-mechanics simulator at the temperature ranges from 350°C to 750°C and the strain rate ranges from 0.01s-1 to 5s-1. The results show that high-temperature flow stress-strain curves of Al2O3/Cu-WC composites have typical features of the softening mechanism of dynamic recovery and dynamic recrystallization. The peak stress increases with the decreasing of deformation temperature or the increasing of strain rate. The hyperbolic-sine type equation shows good agreement with the experimental stress. Upon the basis of the above experimental results, the activation energy of the composite is calculated as 208.34kJ/mol.
Comparison of Conservatism on Applying Statistical Analysis Method to Determine Composite Allowance
Authors: Feng Zhen Yu , Mao Ke Yi , Zou Tian Chun
Published: October 2011

In this paper, composite static strength test are analyzed with the Weibull and normal statistical method. Compare the Weibull analysis with the normal analysis, which shows that the A-basis value and B-basis value from the Weibull analysis respectively are less than ones from normal analysis by approximate 9.7% and 2.6% under tension loading, on the other hand they are decreased by approximate 16.1% and 5.2% under compression loading. This analysis result has the higher application worth.
Impact Damage Behavior of Composite Stiffened Plates
Authors: Yan Li , An Xue Feng , Zhang Chen Qian , Yi Xiao Su
Published: October 2011

Damage behavior of composite stiffened plates of structure I and structure II at different positions and under different impact energy subjected to low-velocity impact testing was studied in this paper. Visual observation and ultrasonic C-scanning were also employed to inspect the damage size. The results showed that damage behavior of composite stiffened plates was not only related to damage behavior of laminates, but also related to damage between stringer and laminate and damage of stringer itself. It was found that the mechanism of absorbing energy varies with the impact position, as well as the damage behavior. When the impact position was near stringer, partial energy was absorbed by stringer to make stringer and laminate disengage and damage area of laminates was smaller. Damage behavior of composite stiffened plates varies with the structure. Damage area of samples of structure II was smaller than that of samples of structure I. It was estimated preliminarily that design of structure II was better than that of structure I.
Design and Experiment of PVDF Transducer for Laser Ultrasound Detecting
Authors: Geng Sen Lin , Zhang Xiu Qin , Li Fang Ju
Published: October 2011

The design of PVDF transducer is finished and its designing idea and structure frame are presented. The laser ultrasound in nano A1P/SiO2 is detected by the PVDF transducer and the acoustic signal curve is obtained. The ultrasound waveform thermal elastically generated by a rectangular laser pulse is theoretically presented. The ultrasound pulse waveform obtained in the experiment is in accordance with the one in theory. It is shown that this design method is simple, practical and easy to implement.
Face Data Acquisition and Error Analysis
Authors: Cheng Xiao Min , Liao Cun Jie , Ye Zi Qing
Published: October 2011

Data collection and processing of human faces are hot spots of reverse engineering. This paper studies the data collection of human faces, the pre-treatment of point clouds, and analyzes the error of data collection at the same time. Data collection mostly uses proper system parameters to get desired point clouds. Pretreatment of point clouds deletes the desultory points first, then merge the point clouds. Finally, analyze the errors that are caused in the process of data collection, mostly analyze the effects of equipment, ambient light, and system parameters on accuracy of data collection, then find the best treatment to get a desirable experimental result.
Application and Design of the New Steel Fiber RPC Column-Template without Demolition
Authors: Wang Jun , Sun Zhi Wei
Published: October 2011

Innovation of material and function represents the direction of contemporary architecture template development. Based on the study results of domestic and foreign building templates, a new type of template structure—Steel fiber RPC (reactive powder concrete) column-template without demolition is presented taking account of the characteristics of template materials and construction methods. Compared with the traditional template, the new one takes composite material and function innovation as a breakthrough. It improves efficiency of construction while the column-template forms the outer surface of the decorative grass-roots which expands the scale of the function of column template. This paper introduces the material selection and illustrates the calculation of the new template. Based on the existing design specification of template, new design recommendation of template thickness is proposed through theoretical analysis and simulation, which provides a theoretical basis of steel fiber RPC column template without demolition in engineering applications.
Manufacturing of Removable Complete Dentures Using Vacuum Casting Technique
Authors: Saidin Wahab , Kassim Noraniah , Yusof Yusri , Ahmad Rajion Zainul
Published: October 2011

This paper presents the research on manufacturing for full denture components. The aim is to develop a new manufacturing procedure for the removal full denture by integrating the techniques used in the Advanced Manufacturing Technology (AMT). The 3D-ATOS scanning system was used to obtain the surface data of the denture teeth sets, the edentulous models and the rims for patient. The surface quality of the digitized images was further refined by using Geomagic Studio 10 and the complete model of the denture components were prepared using Solid Work CAD application tool. A set of library for teeth was developed in the CAD system which includes the reference lines and points for setup and assembly process. The master models of the full denture were produced using MJM rapid prototyping system. The full denture was fabricated using acrylic resin (Vertex Castavaria) material using vacuum casting technique. The finish denture was then tested on patient and found satisfactory with good fitting accuracy as compared to the conventional denture. The use of vacuum casting procedure also has improved about 30% flexural strength as compared to the conventional technique (compression flask).
A Research on Surface Morphology of Cutting of Titanium Sheet with Water-Jet Guided Laser and Conventional Laser
Authors: Li Chun Qi , Yang Li Jun , Wang Yang
Published: October 2011

Titanium is a class of material difficult to common machine. Laser processing is a feasible method for machining of titanium. This paper presents cutting investigation of industry pure titanium sheet with conventional laser and water-jet guided laser, and analyses their processing features by means of the surface morphology of kerf obtained from Scanning Electron Microscope. The result shows that the machining quality and cleanliness of water-jet guided laser processing is much better than conventional laser processing. The impact and cool effects of the high-speeds water jet are more effective to trim the cut surface and remove molten waster.
Influence of Surface Texture on Lubrication Performance of Hydrodynamic Journal Bearing
Authors: Wang Su Hua , Wu Xin Yue , Zheng Jian Hua
Published: October 2011

A finite-difference numerical model is used to study the influence of surface texture on lubrication performance of hydrodynamic journal bearing. Reynolds equation is adopted to calculate the bearing load carrying capacity, friction force and friction coefficient under different width-diameter ratio, different eccentricity ratio and different texture location. Results show that partial texture along the circumferential direction on the bearing with small width-diameter ratio will increase bearing performance appreciably. Partial texture along the axial direction will decrease friction coefficient effectively, especially at the film inlet zone or the position of film pressure trending to zero.
Reliability Analysis of Radial Tire
Authors: Zhu Chang Shun , Wang Guo Lin , Li Ping Ping , Ma Ru Yu
Published: October 2011

Aimed at the radial tire's randomness in the structural parameters and material properties, etc., took the strain energy density of the tire carcass ply turn-up end as the objective function on the basis of analysis of the tire’s main failure modes, chose the tire carcass ply turn-up height and the rubber material parameters as random variable by using the Finite Element sensitivity analysis method(DSA), On this basis, adopted Monte-Carlo stochastic finite element method to calculate the reliability of the fatigue life of tire.
Projects in the Optimal Allocation and Management of Construction Equipment
Authors: Yang Tian Xiong , Yang Shun Tian , Peng Mei Wu
Published: October 2011

Projects, construction equipment management is the process of the project and construction management of production factors is an important component. Construction equipment on the project configuration, use, cost accounting and other comprehensive systematic study, given the optimal configuration and dynamic management decision-making programs, to achieve their project goals.
Optical Property and Photoisomerization of Some Functional Azobenzene Derivatives with Aromatic Substituted Groups
Authors: Jiao Ti Feng , Li Xu Hui , Li Qiu Rong , Zhou Jing Xin
Published: October 2011

Some functional azobenzene derivatives with aromatic substituted groups have been synthesized and their photoisomerization have also been investigated. It has been found that depending on different substituted groups, such as phenyl or naphthyl segments, the formed azobenzene derivatives showed different properties, indicating distinct regulation of molecular skeletons. Spectral data confirmed commonly the characteristic absorption of substituted groups and aromatic segments in molecular structures. In addition, the photoisomerization of all compounds in solution can show trans-to-cis photoisomerization by UV light irradiation, and demonstrate distinct isomerization ratio depending on effect of different substituted headgroups. The difference is mainly attributed to the aromatic substituted headgroups and methyl group in molecular structure. The present results have showed that the special properties of azobenzene derivatives could be effectively turned by modifying molecular structures of objective compounds with proper substituted groups, which show potential application in sensor and functional material field.
Performance Analysis of Hydrodynamic Finger Seal with Herringbone-Grooved Structure
Authors: Hua Su , Wang Xi Chun
Published: October 2011

Three dimensional solid-fluid interaction numerical analysis models of both the finger seal with herringbone-grooved pad and the finger seal with herringbone-grooved rotor were established in order to study the performance of hydrodynamic finger seal. The models investigated fluid radial under pad force and fluid leakage as a function of both the rotor speed and the high- to low-pressure differential. It was shown that the finger seal with herringbone-grooved structure in pad or in rotor could bring lift force under the finger pad so as to keep the finger seal in non-contacting status. For the two types of finger seal, their load carrying ability and fluid leakage varying with the pressure differential were almost same. In the same velocity of rotor surface, the load carrying capacity of the finger seal with herringbone- grooved rotor was greater and the leakage was less than that of the finger seal with herringbone-grooved pad respectively. With the conditions of rotor structure allowing, it is suggested to select the finger seal with herringbone-grooved rotor first for designing the hydrodynamic finger seal with herringbone-grooved structure.
Effect of Powder Size and Volume Fraction of WC on the Microstructure of Laser Cladding WC-NiCrBSi Composite Coatings
Authors: Wang Y.Y. , Gong Y.F. , Sun T.F. , Ni P.F. , Liu Z. , Gao G.H. , Li C.J.
Published: October 2011

WC-NiCrBSi composite coatings on 0.45 % carbon steel were fabricated by laser cladding. The volume fraction (33, 43 and 60 vol. %) of WC particles with the powder size of 2 μm, 5 μm and 50 μm were added respectively into NiCrBSi powders to deposit composite coatings. The microstructure of the powders and the coatings were examined by scanning electron microscope (SEM) and X-ray diffraction (XRD). Results show that the compactness and uniformity of the coatings are good when WC particles size was 2 μm and 5 μm. However nonuniform distribution and deposit of WC particles on the bottom of the coating will occur when the powder size of WC particles was 50 μm and the volume fraction of WC was 33 %. When the volume of WC addition was higher than 60 %, the volume fraction of the retained WC particles in the coatings is obviously decreased. The dissolving and decomposing of WC increase with decreasing the powder size and increasing the volume of WC addition and the laser power.
Strategies for Overseas Capital Operations of Chinese Enterprises
Authors: Yan Gu Jun
Published: October 2011

with the deepening of opening up, overseas capital operation has become an inevitable choice for Chinese enterprises, and also an important way to gain new development opportunities. In the process of overseas capital operations, the Chinese enterprises should carefully select the corresponding operation modes according to their own characteristics, pay great attention to the choice of foreign partners and target assets, and adhere to the principle of diversified regional distribution.
Systematic Functional Design for Sustainable Innovation
Authors: Zhang Cheng Ye , Tan Run Hua , Cao Guo Zhong
Published: October 2011

Functional design is an important method for problem-solving and high-level innovation, and function innovation is the front end of functional design. Sustainable function innovation is a practical and innovative way to solve the issue of sustainability. Based on the concept of front-end prevention, functional design and sustainable design are integrated. The key enabling technologies for sustainable function innovation (function evolution, function combination and function failure) are studied, and then systematic functional design process is built from function innovation angle. Integrated systematic functional design, the innovative process model for sustainable innovation is introduced. A innovative design example of continuous source for CdTe deposition on a glass sheet substrate demonstrates the proposed model and theory is feasible
The Design and Implementation of Teaching Management System Used in Experiment and Training Base
Authors: Shang Yan , Ding Hong Sheng , Wang Chun Yan , Su Long Jiang , Zhao Yu Can
Published: October 2011

In order to improve the automatic level of teaching management in experiment and training base, a teaching management system is designed and implemented. The teaching process such as checking on work attendance, logging on school reports and equipments’ management can be carried automatically. The efficiency and the management level can be increased, and the resource sharing can be realized. to meet this demand. The use of numerical control experiment and training management system will improve the level of teaching and management of our training base.
A Deadlock Prevention Using Adjacency Matrix on Dining Philosophers Problem
Authors: Zhan Jin Song , Guo Yong Ning , Liu Cheng Lian
Published: October 2011

In computer science, the dining philosopher’s problem is an illustrative example of a common computing problem in concurrency. It is a classic multi-process synchronization problem. In this paper, we proposed a mathematical model which it expresses an adjacency matrix to show the deadlock occurs, and how resolve it.
Preparation and Application of High Molecular Weight Coagulant Made from Ilmenite Residues
Authors: Guo Qing Quan , Wang Xiao Feng , Li Lei , Li Da Guang , Zhu Wen Xin
Published: October 2011

With Ilmenite residues as raw material, the inorganic high molecular weigh coagulant is prepared by orthogonal experiment method. It shows that optimum synthesis conditions are: the polymerization temperature being 50°C, the dosage of acid being 20ml, the polymerization time being 2h,and the dosage of oxidant being 8ml. The structure and morphology characteristics are analyzed by FT-IR and SEM. The application of the coagulants in printing and dyeing wastewater treatment is explored.The coagulation experiment results show that the removals of chroma and COD are affected by preparation conditions.
Fault Location of Transmission Line Based on Discrete Wavelet Transforms
Authors: Tang Wen Xiu , Zhang Mo , Liu Ying , Lang Xu Fei , Zhu Liang Kuan
Published: October 2011

In this paper, a novel method is investigated to detect short-circuit fault signal transmission lines in strong noise environment based on discrete wavelet transform theory. Simulation results show that the method can accurately determine the fault position, can effectively analyze the non-stationary signal and be suitable for transmission line fault occurred after transient signal detection. Furthermore, it can effectively eliminate noise effects of fault signal so as to realize the transmission lines of accurate fault.
Design Optimization of Cutting Parameters when Drilling Metal Matrix Composites
Authors: Sriprateep Keartisak , Inthidech Sudsakorn , Singto Sarawut , Patumchat Puttipong
Published: October 2011

The Taguchi method is used to find the optimal cutting parameters when drilling metal matrix composites (MMCs) with a polycrystalline diamond (PCD) tool. The combined effects of cutting parameters (cutting velocity and feed rate) and cutting time on three performance measures (tool wear (VBmax), the specific cutting pressure (Ks) and hole surface roughness (Ra)) were investigated employing an orthogonal array, signal to noise (S/N) ratio and the analysis of variance (ANOVA). The optimal cutting parameters for each performance measure were obtained, and the main cutting parameters that affect the cutting performance in drilling operations can be found. The relationship between the drilling parameters and the performance measures were determined using multiple linear regressions. Confirmation tests of the optimal levels with the initial machining parameters are carried out in order to illustrate the effectiveness of this approach for drilling MMCs.
The Control System's Design of the Upper Air Crawling Robot
Authors: Liu Gui Zhen , Liu Ting , Liu Yang , Wen Bang Chun
Published: October 2011

The crawling robot can carry the detector set to inspect the mast or the rope, this paper introduced the robot’s composition and the function, and carried on control system's design to the robot
Study on Phases and Thermoelectric Properties of Bulk Fe4Sb12 and Fe3CoSb12 Prepared by Milling and Sintering
Authors: Liu Ke Gao , Li Jing
Published: October 2011

Bulk Fe4Sb12 and Fe3CoSb12 were prepared by sintering at 600 °C. The phases of samples were analyzed by X-ray diffraction and their thermoelectric properties were tested by electric constant instrument and laser thermal constant instrument. Experimental results show that, the major phases of bulk samples are skutterudite with impurity phase FeSb2. The electric resistivities of the samples increase with temperature rising at 100~500 °C. The bulk samples are P-type semiconductor materials. The Seebeck coefficients of the bulk Fe4Sb12 are higher than those of bulk Fe3CoSb12 samples at 100~200 °C but lower at 300~500 °C. The power factor of the bulk Fe4Sb12 samples decreases with temperature rising while that of bulk Fe3CoSb12 samples increases with temperature rising at 100~500 °C. The thermal conductivities of the bulk Fe4Sb12 samples are relatively higher than those of and Fe3CoSb12, which maximum value is up to 0.0974 Wm-1K-1. The ZT value of bulk Fe3CoSb12 increases with temperature rising at 100~500 °C, the maximum value is up to 0.031.The ZT values of the bulk Fe4Sb12 samples are higher than those of bulk Fe3CoSb12 at 100~300 °C while lower at 400~500 °C.
Virtual Design and Inverse Dynamics Analysis of Aircraft Taxi-Mover Lifting Unit
Authors: Shi Xu Dong , Shi Shou Wen , Li Jian Li
Published: October 2011

A new holding-lifting autosteer mechanism (HAM) is introduced which is fit for aircraft taxi-mover. The relation between the Multi-bar mechanism and tug operation of the aircraft on the taxiway is also discussed. With this understanding , a virtual parameterized model of holding-lifting autosteer mechanism is established by Pro/E . Based on Single-opened-chain , inverse dynamic analysis for planar parallel lifting unit is presented .
Finite Element Analysis of Accurate Tooth Profile Diesel Engine Gear
Authors: Wang Da Shu , Li Hong Mei
Published: October 2011

This paper puts forward the method of establishing the accurate 3D model of involute gear and imports the model to MSC.Patran to mesh the grid. The stress distribution is simulated by applying the MSC.Marc to solve the nonlinear contact problem. It is a quick and accurate method to analyze the gear contact strength.
Speed-up and Speed-down Controller of Step Motor Based on SCM
Authors: Su Xing Ye , Li Qin , Li Fu Bao
Published: October 2011

In order to prevent the locked rotor, step-out and super ledge speed control of step motor, speed-up and speed-down control to the step motor should be carried out. Based on the speed -up curve analysis, using of symmetrical design, this paper has simplified the speed-up and speed-down curve. In order to achieve real-time computing exponential curve in SCM, using the method of constant duration and control pulses, speed-up and speed-down control, exponentially, are achieved, and, the connections between step motor and drive and circuit have been designed.
Research on the Reliability of Box for Gear Test Bed
Authors: Jin Xiang Yang , Zhang Tie Feng , Zhao Li Li , Wang He Teng , Guan Xiang Yi
Published: October 2011

To determine the efficiency, load-bearing capacity and fatigue life of beveloid gears with intersecting axes, we design a mechanical gear test bed with closed power flow. To test the quality of its structure and predict its overall performance, we establish a three-dimensional solid model for various components based on the design parameters and adopt the technology of virtual prototyping simulation to conduct kinematics simulation on it. Then observe and verify the interactive kinematic situation of each component. Moreover, the finite element method is also utilized to carry out structural mechanics and dynamics analysis on some key components. The results indicate that the test bed can achieve the desired functionality, and the static and dynamic performance of some key components can also satisfy us.
Confirm Method for the Output Precision of Machine Tool Based on Machining Precision of Workpiece
Authors: Huang Qiang , Li Qing Feng
Published: October 2011

For the machine tool with complex forming motion, there is not accurate corresponding relationship between the existing criterion on precision design and the machining precision of workpiece. This article proposes a design scheme on machine tool precision based on machining precision of Workpiece. In this scheme, the first work is to complete the precision distribution and inspection from the workpiece to various component parts of technology system and achieve the total output precision of machine tool under the specified machining precision. This article serves YK3610 gear hobber as the example to describe the error model of system and basic application method in this work.
Thermal Diffusion in Jammed Aluminum Nanopowders
Authors: Ho Ching Yen , Ma C. , Sui F. M.
Published: October 2011

Nanoparticles show a variety of size-dependent properties due to the dramatic changes in the ratio of surface area to volume. The characteristics of nanoparticles different from the bulk material make the properties of the powders composed of these nanoparticles attract more attention. The heat transfer in the powder composed of nanoparticles is experimentally investigated in this paper. The powder is wrapped up in the slender tube made of insulating material. One end of the slender tube filled with powder is maintained at low temperature and the other end is kept at room temperature. The temperature histories at two different locations in the slender tube are recorded using thermalcouples. The results show that the heat transfer depends on the bed porosity and the thermal conductivities of the solid and the gas. The pressure on the Al powders enhances the rate of heat transport due to the decrease of the bed porosity and a small fraction of gas.
Glass Fibers as Engineering Materials
Authors: Chen Zhou , Chen Zhao Feng , Xu Teng Zhou , Qiu Jin Lian , Zhou Jie Ming
Published: October 2011

Glass fibers feature extremely low thermal conductivity, high modulus, high toughness, light weight and non-combustible property. These materials can work in situations in which plastics and metals would fail and need to be part of designer’s repertoire. They have many applications in design engineering and can solve many special problems. This paper contains a number of chapters as follows: introduction to glass fibers, manufacturing processes of glass fibers, markets and applications of glass fibers. The conclusion of this paper contains some strategic lines of glass fibers usage in industry and estimations about the future development of glass fibers.
Information Query System of Cultivated Land Quality Based on ArcGIS Server
Authors: Song Xuan , Du Li Ping , Chen Jie
Published: October 2011

With rapid development of WebGIS technology, the agricultural administration sections can publish and maintain the quality information of cultivated land by WebGIS, it allows users remotely access, query and analyze the information of land quality and soil fertility through the network for farmers to provide decision-making information of farming and fertilizer. Taking Yu county, Henan province, China as an example, this study presents the implementation of WebGIS for the Yu county’s land quality using ArcGIS Server and ASP.net. The system has basic functions of the geographic information system, such as enlargement, reduction, roaming, full display, length and area measurement; the system can also use the advanced functions, such as the advanced SQL query, print the query results according to different scales, etc. The system also provides the relationship with the public map services (Virtual Earth), it make the user find easily the location information of his own spot. This study provides the basic data management platform for agricultural informatization.
Research on Stress Intensity Factor of Gear Crack and its Variation with Changes of Gear Parameters
Authors: Dong Fei Fei , Shao Ren Ping , Ma Jie
Published: October 2011

Used the theory of linear fracture mechanics and FEM, the two-dimensional model of single-tooth gear is established under the environment of ANSYS. The stress intensity factor(SIF) is analyzed when gear crack occurs and the variation of SIFs is discussed with changes of crack length, gear module, number of teeth, load when gear crack emerges at the pitch circle and tooth root respectively, and the influence of different cracked directions on tooth root is studied; The pragmatic expression of SIFs KI, KII have been brought forth with the results obtained by FEM. These establishes a good foundation on the fracture analysis and diagnosis of gear
Studies on Process Information Expression Techniques of 3D CAPP
Authors: Wang Jiang Yong , Mo Rong
Published: October 2011

In allusion to the status of the expression and integration technology of the three-dimensional CAPP processing information, a machining process information expression and integration method was put forward, which was process-oriented and based on the three-dimensional model of products. The machining process object was represented by the processing structure tree, and the processing information was expressed and collected in the three-dimensional situation. Finally，a prototype system was developed to illustrate the feasibility and validity of the proposed method.
Molecular Dynamics Simulation of the Adsorption Behavior of Amino Acid Corrosion Inhibitor on Cu (001) Surface
Authors: Dai Wei , Zhang Yu Ye
Published: October 2011

Molecular dynamics simulation has been employed to investigate the adsorption behavior of glutamic acid and aspartic acid on Cu (001) surface, and the inhibition mechanism was also discussed. The results indicated that the two corrosion inhibitors could both adsorb on the Cu surface firmly due to the interaction between polar groups and surface. The two inhibitors both have excellent corrosion inhibition performance. However, the inhibition performance of glutamic acid is better than aspartic acid.
The Study on Motor-Function Evaluation of Upper-Limb Rehabilitation Robot Based on AHP
Authors: Li Xing , Wang Jian Hui , Zheng Yan , Gu Shu Sheng
Published: October 2011

To solve the problem of real-time, quantification monitor on the restoration of motor function in hemiplegia after stroke, this paper proposed motor-function evaluation content for 5-DOF upper-limb rehabilitation robot based on traditional motor-function evaluation method, and then it constituted judgment matrix and calculated weights by Analytical Hierarchy Process, finally, established a synthetical evaluation model of motor function for upper-limb rehabilitation robot. This paper is the organic combination of operational research, rehabilitation medicine and robotics. Compare with traditional motor-function evaluation method, the new evaluation method is so simply and flexible that it greatly increases the reliability, validity and feasibility of evaluation, which has changed traditional evaluation methods into mathematical process. It is the new orientation in motor-function evaluation.
Autonomous Mobile Robots and Development of Vision Based Automotive Assistance Systems
Authors: Mao Yan Fen , Wiedmann Hans , Chen Ming
Published: October 2011

The paper describes an autonomous mobile robot named Robotino®, and how it is used for education of Bachelor-students in the majors AES (Automotive Engineering & Service) as well as in MT (Mechatronics) in CDHAW, Tongji University. A fine positioning project using image processing is introduced, and vision-based functions from Robotino®View are presented. It is sketched out how this system also can be used as a research platform for automotive assistance systems.
An Integrated Technology of Green Planning for Workshop Layout and Machining Operations
Authors: Zhao Gang , Zhang Hua , Jiang Zhi Gang , Yan Wei , Xiao Ming
Published: October 2011

A thermal power valve workshop applying the integrated technology of green planning for workshop layout and machining operations (GPIT) has been constructed from the demands of enterprise development. The key technology is to model the full life cycle production for the typical products in the workshop and carry out a green planning for the whole workshop. By the attribute analysis of the resource consumption and environment impacts, some adaptive processes of green manufacturing and prototypes of processing devices are developed for the physical productions in the valve workshop. The green planning and optimal operation for the workshop production is implemented and the remarkable environmental and economic benefits are gained.
Intelligent Evaluation Model for Cementing Quality Based on GA-SVM and Application
Authors: Liu Jing Cheng , Zeng Shun Peng , Yuan Zhi Gang
Published: October 2011

The cementing quality is directly related to the normal operation of the gas well, therefore, the evaluation of cementing quality is key to the correctly use the gas well as well as to take measures to protect the gas well. In this paper, four first wave amplitudes at the same depth point when using the borehole compensated sonic logger with double transceiver technique to carry out the acoustic amplitude log operation are served as the discriminant factors to evaluate the cementing quality. Taking the engineering actual measured data as the learning samples and using the particle swarm optimization to optimize the parameters of support vector machine, this paper established the intelligent evaluation model for cementing quality based on genetic algorithm (GA) and support vector machine (SVM). The model employs the excellent characteristic of SVM which has high speed of solving and could describe nonlinear relation as well as the characteristic of GA which has global optimization. Through test of engineering samples, the research result showed that this model has fast astringency and high precision, providing a new method and approach for the fast and accurate evaluation of the well cementing quality.
Experiment Study on Tribological Properties of the Coating with Different Surface Textures
Authors: Zhao Yun Cai , Hu Fang Ping , Liu Xiao Mei , Deng Chun Ming , Ma Wen You
Published: October 2011

This paper is about the KF301/WS2 modified lubricating wear-resisting coating which is prepared by supersonic plasma spraying, laser remelting and surface texturing technology, tribological characteristic of KF301/WS2 lubricating wear-resisting coating of four different (round pit, diamond, parallel and intermittence) tracks and part laser remelting is studied under room temperature. Research shows: textures of different tracks have a certain influence on friction factor of coating’s surface and abrasion loss. Friction coefficient of mouldling surface of broken texture is about 0.012 in the initial stages, while friction coefficient of round pit texture is about 0.0085. Round pit, diamond and parallel microtopography make friction state enter stabilization quickly, effectively restraining the wave of abrasion loss. When wear time reaches to 1 hour, abrasion loss of broken texture is 0.03mg, while abrasion loss of round pit texture is about 0.015mg. Tribological properties, from high to low, in turn, are round pits, diamond, parallel and broken texture.
Experimental Study of Energy Saving Effect of Building Envelope in Winter
Authors: Wang Hou Hua , Zhang Tao , Xiao Qiu Lian
Published: October 2011

This paper presents an experimental study on the energy saving effect of building envelope in winter in Chongqing city. The basic cubicle was adopted for comparison. Experiments show that when energy saving measurements are applied in the external walls and windows, energy saving cubicle has an average energy efficiency rate of 32.68%, 7.68% over the target value of the standard. The indoor temperature of the energy saving cubicle is higher than the basic one’s. The internal surface temperature and the temperature difference between the exterior and interior of the insulation wall of the energy saving cubicle are both higher than that of the basic cubicle, the mean value is 1.28°C and 1.90°C respectively. And the temperature difference of the insulation glass is higher than that of the single glass, with a maximum value of 6.32°C. Daily simulation of the two cubicles is addressed by VisualDOE-4.0, the mean error between simulation and experiment is 16.16%, illustrating the effectivity and the accurateness of the VisualDOE-4.0.
Research on Super Critical Water Oxidation Based on Papermaking Black Liquor Treatment
Authors: Zhang Kai Sheng , Li Zhi Jian , Zhang Xin
Published: October 2011

Super Critical Water Oxidation is an innovative and high technology. This article discussed properties of Super Critical Water (SCW), the reaction mechanism, technological process, strength and weakness of Super Critical Water Oxidation (SCWO).The future of SCWO is also prospected.