bluuebunny/crossref_metadata_2025 huggingface dataset:
The Digital Engine Simulation Management Platform Based on MSC.SimManager
Authors: Lou Di Ming , Qiang Qiang , Zhu Yan Juan , Du Yu Biao
Published: August 2011

To solve the problems of engine simulation process faced, the framework of simulation management platform of digital engine based on MSC.SimManager was put forward. The characteristics and functions of simulation management software named SimManager were mentioned. The portal design process and function and management objects of this platform were discussed, which included rights management, project management, simulation of process management, data management, and so on. The result of this study would be provided for the further application of the simulation platform.
Tensor Factorization and Clustering for the Feature Extraction Based on Tucker3 with Updating Core
Authors: Wang Hai Jun , Xu Fei Yun , Wang Fei
Published: August 2011

Aiming at the problems of Tucker3 to large-scale tensor when applied to feature extraction, a new factorization based on Tucker3 is proposed to extract feature from the tensors. First, the large-scale tensor is divided into multiple sub-tensors so as to conveniently compute cores of sub-tensors in parallel mode with Matlab Parallel Computing Toolbox; Then, the cores of each sub-tensor are updated for reducing deviation in calculating and the similar characteristics of sub-tensors are clustered to obtain the features. Experiment results show that this methods is able to extract features rapidly and efficiently.
Thermal Study on High-Power White LED down Light
Authors: Bai Kun , Wu Li Gang , Nie Qiu Hua , Dai Shi Xun , Zhou Bo You , Ma Xiang Jun , Zheng Zhao Yong
Published: August 2011

An actual packaging structural of high power three-chip white LED lamp is designed. The highest temperature of LED chip is 111.2°C, and the temperature range of heat sink is 72.6°C～73.8°C by finite element method (FEM). The respective temperature of lead frame and heat sink are 76.0°C and 71.0°C, which are measured by the thermocouples experiment. Based on the consistency between simulation results and experiment data, considering the steady temperature distribution of the lamp and heat transfer theory, several optimization methods are proposed. The effects of copper pad dimension, solder paste area and natural convection coefficient on the temperature field distribution are calculated.
Research on Whirling Vibration of CPP Propulsion Shafting
Authors: Liu Gang , Huang Bing Yang , Hua Zhi Gang
Published: August 2011

The parameters influencing the whirling vibration characteristic is more for the CPP (Controllable-Pitch Propeller) propulsion shafting, comparing to the traditional shafting. Verified by a ship’s CPP propulsion shafting, the method of transfer matrices is used for analyzing whirling vibration, by building a hybrid model fosr lumped parameter elements and distributed parameter elements. Then the parameters influencing the whirling vibration characteristic are analyzed, which could provide evidence for the analysis on the whirling vibration for the CPP propulsion shafting.
Study on the Freezing Resistance of HFCC
Authors: Ai Hong Mei , Lu Pu Guang , Bai Jun Ying , Wei Jing Jing
Published: August 2011

To the High fly-ash content concrete(abbreviated HFCC) whose fly-ash adding amount is 50%~70%, the influence of actual water-binder ratio, fly-ash content, quality of fly-ash and compression strength on the freezing resistance of HFCC were studied; The critical freeze-thaw cycle times in this paper involved with mass loss rate Wn=5% and relative dynamic elastic modulus P=60%, the relationship between the critical freeze-thaw cycle times and the 28d compression strength of HFCC was analyzed; To HFCC without air-entraining agent, the experiment results showed that the freezing resistance decreased with the increase of actual water-binder ratio, the increase of fly-ash content and the reduce of fly-ash quality. The freeze-thaw damage of HFCC dues to the freeze-thaw degradation results from surface denudation.
Polynomial Moving Fitting Method for Edge Identification
Authors: Yuan Xiang Rong
Published: August 2011

A moving fitting method for edge detection is proposed in this work. Polynomial function is used for the curve fitting of the column of pixels near the edge. Proposed method is compared with polynomial fitting method without sub-segment. The comparison shows that even with low order polynomial, the effects of moving fitting are significantly better than that with high order polynomial fitting without sub-segment.
Free Form Surface Reconstruction Method Based on LS-SVM
Authors: Wu Fu Zhong
Published: August 2011

A free form surface reconstruction method based on least square support vector regression is presented. Firstly in order to eliminate noise points, some sample points are chosen from the measured data to construct LS-SVM model. Thus a LS-SVM model to approximate the measured points is obtained. And the distribution probability of the approximation error is figured out. In result, the noise points are eliminated when their error probability is less than the specified threshold value. Then the boundary points are extracted. Lastly the surface model is reconstructed by use of the measured points from which noise points have been eliminated. The results indicate that the reconstruction precision can satisfy the demands of engineering application.
Thermal Analysis of High-Power LED Tube Lamp
Authors: Ma Xiang Jun , Wu Li Gang , Dai Shi Xun , Zhou Bo You , Bai Kun , Zheng Zhao Yong
Published: August 2011

Heat dissipation of high-power LED lamps has become a key technology to LED package due to the improvement of the LED output power. A detailed simulation of temperature distribution of three chips high-power LED tube lamp was made by finite element method. Based on the consistency of the LED lamp experimental and simulation results, the analyses of the effect of thermal conductivities of PCB, thermal grease, heat sink, convection coefficients and the length of the lamp on the junction temperature were made, which provide an effective reference for the thermal design.
Research on Fault Knowledge Base Technology of High-End CNC Machining System
Authors: Xu Xiao Li , Ren Bin , Zuo Yun Bo , Wu Guo Xin
Published: August 2011

In the high-end CNC machining process, the stability and reliability of the running state of the machining system directly affects the machining accuracy and work-piece quality. In order to effectively ensure the reliable, stable, safe operation of the high-end CNC machining system, the fault knowledge base technology construction for the cutting tool system is carried out. It focuses on the high-end CNC machine tools, and build the condition monitoring system test platform with cutting tool system as the core; the fault sample acquisition method based on the rough set theory is proposed; a knowledge base model construction technology is conducted; and the network-based sample acquisition test platform is established, so as to provide users with data information on the operation of cutting tool system, and provide the key test techniques for the generation mechanism of the dynamic performance and wear condition of the operation of cutting tool system and for the analysis of the intrinsic correlation between the characteristic parameters and wear condition of cutting tools.
LST Based Function Modeling Based on for Mechanical Products
Authors: Yan Han Bing , Ju Hui
Published: August 2011

The efficiency of the modeling method is the decisive factor for the success of generated innovative solutions, while existing modeling methods are usually based on the assumptions that many prior knowledge/information about the design has been acquired. A novel modeling approach based on living system theory is proposed and its detailed implementation steps are given, which provides an easy operating, complete information representation, and general-purpose decomposition mode for the functional design of mechanical product. Finally, through the application in the design of automatic packaging mechanism, the feasibility and efficiency of the proposed method is verified.
The Application Study in Computer Aided Design Based on the Hand-Drawn Performance
Authors: Zhao Ke , Hu Wei Ping
Published: August 2011

With the rapid development of computer-aided design, traditional hand-drawn performance undergoes a fundamental change. Since it has the characteristics of a variety of vivid, fast and convenient, the computer-aided design has become a new desinging trend. However, while the computer brings us conveniences, it also has many negative effects. Many designers rely on the computer-aided design excessively, and ignore the hand-drawn performance’s special advantages of enlightenning creative thinking, emphasizing the personality performance, promoting computer performances, and improving professional attainment. In the informationlized computer age, in order to better reflect the design’s essential connotation, we only have to combine the hand-drawn performance and the computer-aided design together perfectly, and coordinated development of the two should be the orientation of contemporary design.
Structural Dynamic Topology Optimization of the Transmission Housing
Authors: Yao Shou Wen , Lv Jian Li , Peng Qing Dong
Published: August 2011

Dynamic performance is one of the most important factors in the product’s life. Transmission housing is one of the important components in vehicle, which has direct influence on the vehicle’s powertrain performance. Dynamic topology optimization can improve the product’s performance. The dynamic topology model is built, in which the density of elements are the design variables, the displacement of frequency response and volume are the constraints, and the objective is to maximize the first natural frequency of the housing. According to the result of optimization, the CAD model of housing is rebuilt and the finite element analysis of the new housing is done.The results show that both the static and dynamic performance are improved besides the mass reduction, namely, dynamic topology optimization can significantly improve the product’s performance.
Green Innovation Design Based on TRIZ Theory
Authors: Liu Zhi Feng , Gao Yang , Zhang Lei , Hu Di
Published: August 2011

The mesopic vision theory is used to study illumination properties of series of light sources, through the test of luminous spectrum and derivation based on the MOVE model, the results show that spectral luminous efficiency function Vmes(λ) is between traditional V(λ) and V′(λ) when the background brightness under mesopic vision condition, and the function of Vmes(λ) is changed with the different of light sources and background brightness. Based on human visual perception, the mesopic vision equivalent brightness can be calculated, which of HPS is lower than test brightness corrected by V(λ), but white LEDs and FL show opposite phenomena, and the different value between mesopic and photopic brightness presents reduce trend with rising of background brightness.
The Performance Analysis and Experimental Research of Multiple Oil Ports Axial Piston Pump which Able to Control the Movement of Differential Cylinder Directly in the Closed Circuit
Authors: Zhang Xiao Gang , Quan Long
Published: August 2011

In order to realize that an asymmetric flow piston pump can control an asymmetric differential cylinder, a proposal about the application of an asymmetric flow-distributing axial piston pump is put forward. The new type of piston pump can output the flows with two different values to control the movement of the differential cylinder directly in the closed circuit and realize much ideal result of the control of the differential cylinder by a single pump. Also a simulation model of the hydraulic pump is established under the circumstance of SimulationX software, considering the characteristics of the movement of an individual piston, the oil compressibility, and the flow distribution area changed with the rotation angle. The key data of the pump is defined by means of digital simulation. In particular, an analysis is made on the dimension of the unloading groove of the port plate and the characteristics of the flow pulse of the pump. Furthermore, an experimental model pump is manufactured, the basic performances of the pump is tested on the experimental platform at various rotatory speeds such as pressure, flow and noise, in the end the accuracy of the principle is verified.
Kinematic Analysis and Synthesis of Geneva Mechanism Combined with Elliptic Gear
Authors: Han Ji Guang
Published: August 2011

When the slot number of geneva is fixed, the kinematic coefficient of common geneva mechanism is a fixed value, too. Using the elliptic gear mechanism as the drive crank of the Geneva, the variable transmission ratio of the elliptic gear mechanism is utilized, which makes the kinematic characteristic of the geneva mechanism changed. A synthesis method of combined geneva mechanism is put forward according to the kinematic coefficients in this paper. The calculation methods of the maximum and minimum kinematic coefficient are proposed. The parameters of the combined geneva mechanism are presented, which the middle position of the kinematic range of the geneva has approximate constant velocity characteristics.
The Improved Design for Automated Teller Machine Based on the Theory of User Requirements
Authors: Hou Ya Jing , Zhang Xi
Published: August 2011

Good products and good service derived from comprehensive understanding of user requirements. Currently, user-centered design (UCD) is mentioned very often in the field of design. However, how to achieve our design based on UCD, and how to carry out user needs throughout the whole product lifecycle The present study showed improved design for Automated Teller Machine（ATM ）, which based on the understanding of the user research theory, establishing the model to solve the problems that the customers faced when they use the machine by analyzing the user needs.
Modern SOHO Office System Design in China
Authors: Xu Ji Feng , Zhang Han Ning
Published: August 2011

With the development of the internet, our life style also takes place a great change under the guide of the design. This article introduces the concept and characteristics of SOHO and its group, analyzes its produce, development and future trend, and occupation, put forward the viewpoint about the possibility of developing SOHO office system in our country.
Innovative Application of Chinese Traditional Modeling Elements to Design of Modern Home Textile Products
Authors: Zhang Xin Ke
Published: August 2011

Based on the styling elements of Chinese imperial costume，the characteristics and cultural connotation of blue and white porcelain in the dynasty of Yuan, Ming and Qing and auspicious patterns among the people as well as the traditional paper-cutting art. The paper analyzes the traditional colors and graphic elements by the decomposed and reconstructed of modern graphic designing method, expounds and demonstrates the innovative application of traditional colors and graphic elements in modern home textile design, and then further realizes the Chinese artistic style of home textile design.
Research on Dissolvant-Based Infrared Yarn Dyeing Process of Polyacrylonitrile Fiber
Authors: Zhang Zheng Yu , Xu Hong , Zheng Chun Ling
Published: August 2011

Cationic dye is a special dye for polyacrylonitrile, but it is very difficult in dying through the core. In practice, the price of special leveling agent for polyacrylonitrile fiber is high, and uniform staining is poor. By mixing a number of organic solvents in the dye bath, we can improve the structure of fibers and its deep-dyed. In this paper, we use n-propanol, isopropanol and benzyl alcohol as organic solvent, by adjusting the pH value and the appropriate temperature, and with special depth and leveling agent for dyeing soaping fastness contrast, to find economically viable process conditions.
The Preparation and Characterization of Carboxymethyl Chitosan Wound Dressings
Authors: Qin Yi Min , Huang Li Qing
Published: August 2011

In order to improve the absorption properties of chitosan wound dressings, this paper used chloro-acetic acid to convert chitosan fibers into partially carboxymethylated chitosan fibers. Fibers with various degrees of carboxymethylation were prepared by controlling the ratio between the weight of fiber and chloro-acetic acid. Results showed that the carboxymethylated chitosan fibers can absorb a large amount of liquid into the fiber structure. When the degree of carboxymethylation is below 50%, the carboxymethylated chitosan fibers can absorb a large amount of liquid whilst maintaining its fibrous struture at the same time.
Concise BEM for State Heat Conduction of FGMs
Authors: Shi Wei , Ma Li Li
Published: August 2011

The thermal conductivity problem of functionally graded plate is studied under different temperature fields by a new concise BEM in this paper. At first, we convert the heat conduction differential equation of functionally graded materials (FGMs) to a homogeneous material thermal conductivity equation by using variable substitution, then the Galerkin boundary integral equation is reduced to be a system of linear equations. Finally we arrive at an internal temperature of objects, and plot the distribution graphics and effects of material parameters on temperature distribution. It proves that the new concise BEM is very effective.
Influence of Convex Hull Density on Friction Contact of Bionic Surface
Authors: Xiao Lin Jing , Zhuang Li Fu
Published: August 2011

In order to study the influence of convex hull density on friction contact of bionic surface, we observed the 3-D structure of locust, tree frog and grasshopper with the 3-D microscope system, the experiments show that there convex hulls(diameters are 4um-6um)on the unsmoothed surface of feet pads; based on that structure the paper designs four kinds of unsmoothed bionic surfaces with different densities(center distances are 2R, 3R, 4R and 5R), the four contact models built by ANSYS are solved at the same loads and constraint condition, results indicate that the elastic deformation on top surface of convex hull is minimum (about 1.000mm) and the maximum (2.135 mm) appears on the midpoint of neighboring convex hulls, and the elastic deformation would increase with the decreasing of convex hulls’ density, big and small density would decrease the contact pressure also. We conclude bionic unsmoothed surface with appropriate density would put up satisfying contact performances and the surface3（center distances is 4R）we designed provides a good reference for bionic surface design and fabricating.
Optimization Design in the Driving Gear Wheel Axle of Triangular Rubber Track Conversion
Authors: Hu Zhen Ning
Published: August 2011

The heavy triangular rubber track conversion for the construction machinery has existed the disadvantage for weight oversized. The effective reduced triangular rubber track conversion's weight is essential in the engineering design. This article established one kind of triangular rubber track conversion driving gear wheel axle's three-dimensional model, integrated dynamics analysis has carried on the finite element analysis to it, based on this and carried on the size using Ansys Workbench to optimize for its most superior structure size, finally to optimized the result to carry on the finite element analysis once more. The result contrast indicated that at maintains under the wheel axle stress level basic invariable premise, after the optimized wheel axle weight reduces greatly, enhanced track wheel's performance effectively.
The Detection of NC Machine Geometric Accuracy Based on the Principle of Multiple-Time GPS
Authors: Deng Yu Fen , Guo Jun Jie , Wang Jin Dong , Lu Jun Feng
Published: August 2011

This paper presents a measurement method of NC machine geometric accuracy. The principle is that a laser tracker is used to collect a lot of target point coordinates on four different locations around the machine during the machine spindle moving. A redundant equations could be established through target point coordinates,then the exact location of each target point coordinates could be determined by the principles of GPS positioning.Through the target point coordinates,the geometric error of machine could be separated. The method has fast measuring speed and low cost.Moreover the measurement precision is higher than direct measurement only using one laser tracker because the GPS positioning principle is used to avoid the angle measurment of laser tracker.
Graft Copolymerization of Acrylamide onto Activated Starch Using Inverse Emulsion Polymerization
Authors: Zheng Dian Mo , Zhu Sheng Gan , Wu Li Ping
Published: August 2011

Activated starch was prepared by ball milling before used. Graft copolymerization of acrylamide onto activated starch was carried out in inverse emulsion using a redox initiation system of ammonium persulfate and sodium bisulfite. The effects of ball-milling time, reaction temperature, initiator concentration and weight ratio of acrylamide to starch on the conversion of monomer, grafting percentage and grafting efficiency were studied. The structure and properties of the graft copolymer and activated starch were characterized by FT-IR, XRD and SEM. The results showed that ball milling could progressively destroy the crystalline structure of starch and improve the chemical reactivity. The monomer conversion, grafting percentage and grafting efficiency of grate copolymerization were 96.6%、62.4%、85.49%, respectively.
Research on Damping Characteristics of New Recycling Vibrational Energy Hydraulic Damping System
Authors: Ding Zhi Hua , Lei Zheng Bao , Lei Mu Xi
Published: August 2011

A vibrational energy-recycling vibration damper is introduced which can recycle some vibrational energy by exporting pressurized oil from rebound cavity to energy accumulator. Pressurized oil can be used for HPS, hydraulic power braking and so on which saves energy. Nonlinear parameterized model of damping characteristics is constructed by fluid mechanics theory, and simulation is made under MATLAB. The results show that damping characteristics of the vibration damper is better than conventional dampers.
Self-Assembly of Flower-Like CeO2 Microspheres via a Template-Free Synthetic Approach and its Use as Support in Enhanced CO and Benzene Oxidation Activity
Authors: Chen Jin Feng , Yi Huan
Published: August 2011

This work reported that porous flower-like CeO2 microspheres have been successfully synthesized via a controlled template-free precipitation method and were used as catalyst support for the oxidation of CO and benzene. The scanning electron microscopy results showed that ceric concentration has great influence on the morphology of CeO2 micro and nanostructures. This flower-like CeO2 microstructure exhibited a superior low-temperature catalytic activity used as catalyst support compared with conventional CeO2 nanoparticles. The enhanced catalytic activity of flower-like CeO2 microspheres could be attributed to its porous structure and the abundant oxygen vacancies on the surface.
Magic Cube Approach Application on Crashworthiness Design of Front Rail for Weight Reduction
Authors: Qi Chang , Yang Shu , Hu Ping
Published: August 2011

Weight reduction is a priority across the automotive industry for improved fuel efficiency and CO2 reduction, and crash safety is the first design criterion considered during vehicle development. This paper is concerned with lightweight design of front rail on a vehicle chassis frame structure through material substitution, i.e., replacing the original mild steel with advanced high strength steel (AHSS), without deteriorating the vehicle’s crashworthiness performance. Magic Cube approach (MQ), a systematic design approach, is conducted to analyze the design problem: by applying space decomposition, a system-to-subsystem-to-component model is developed, which simplifies the design problem. Numerical simulation is carried out with LS-DYNA to evaluate the crashworthiness performances of the original and the new-designed front rail. The result shows that up to 30% weight can be reduced in the new design through material substitution while the crash performance remains the same as in the original design.
Relationship Between Porosity Characteristics and Thermal Conductivity of Different Graphite Size Containing Carbon Refractories
Authors: Chen Xi Lai , Li Ya Wei , Xu Guo Tao , Xue Gai Feng , Chen Hua Sheng
Published: August 2011

High-property carbon refractories for blast furnaces should have high thermal conductivity and excellent porosity characteristics. The relationship between porosity characteristics and thermal conductivity of different graphite size (100mesh, 200mesh, 325mesh, 600mesh and 100mesh respectively) containing carbon refractories was investigated by using mercury porosimeter and laser thermal conductivity instrument. The results indicate that the thermal conductivity was reduced with the increase of porosity and <0.1μm pore volume as well as the decrease of mean pore diameter under the same condition, which was related to the short of thermal conductive route.
Knowledge Acquisition from Simulation Data to Product Configuration Rules
Authors: Ren Bin , Zhang Shu You
Published: August 2011

Product configuration design and simulation analysis are of critical importance in the rapid response to performance-driven product design. Product configuration design is the transition from customer specifications into physical solutions, while simulation analysis compared with testing result explains that physical solutions are correct and applicable to engineering. Configuration rules play an important role in the product configuration design. Finite element analysis (FEA) has been used widely in the simulation analysis. We could regard the simulation data of FEA as the important knowledge source of configuration rules. Then, a methodology of integration between product configuration design and simulation analysis is proposed to realize the dynamic update of configuration rules. An application of a clamping unit of injection molding machine that illustrates the proposed approach is developed at the end of the paper.
The Integration of Unified Knowledge Management with Mold-Design Navigating Process
Authors: Jong Wen Ren , Ting Yu Hung , Li Tai Chih
Published: August 2011

This study uses the embedded browser in the most widely used CAD (Computer Aided Design) , with the mold-design navigating process of the secondarily developed component as the core, to construct a networked knowledge management platform with the interaction between the relational database management and mold-design navigating process. It then integrated the component knowledge database, historical cases and technical files, and gave the overall consideration of mold manufacture and injection molding to assist the mold design. The component knowledge database provides related components and shortens the time of mold design. The historical knowledge database offers related issue points for reference, reducing the repeated occurrence of design errors. The technical knowledge database furnishes the related knowledge in the process of mold development, accelerates the new employee training and cuts the labor cost. For the knowledge database in use, the data will automatically increase and grow, gradually becoming know-why and know-how of strong enterprises, know-what of handling problems and important core assets of the enterprise. The unified integration and utilization of the component, historical and technical knowledge databases make the mold-design navigating process more complete and accelerate the mold design. By data classification and grouping, a consistent GUI (Graphic User Interface) is established, replacing the words by icons, easier for developers to use. The accumulation and feedback of the knowledge databases provide more complete data, information and knowledge and thus considerably reducing the time for the mold development.
The Recognition of Smart Car Track and Starting Line
Authors: Dai Wen , Cao Ming Ge , Ren Xu Ying
Published: August 2011

In this paper, an intelligent car control system based on MCU is proposed. A camera mounted on the car is used to capture path images, in which path is recognized by image processing method. Based on the extracted path information, the car motor controls are applied to keep car running in the given path. The recognition rate and precision of main track and starting line will directly affect the precision of control system. In this article, a recognition method is proposed, and experimental results show that our car can follow the main track and stopped on the starting line.
Research on a New Frictionless Air Cylinder
Authors: Yao Yan Sheng , Zhang Ke Ren , Yu Zhen , Mei Tao
Published: August 2011

The definition, status and development of frictionless air cylinder are presented. As design guidance, leakage model of long piston cylinder during starting action stage is built. It shows influences of clearance, length of piston and other parameters on seal ability. Leakage model of another piston with two rows of small pores is introduced and studied. In those structures the number and diameter of holes as well as clearance of piston-cylinder are key factors of leakage. Based on above models and principles, a new type of air bearing piston with pores, pressure distribution groove and seal gaps is proposed and a single-acting frictionless cylinder is designed. Its pneumatic experiments have been done in a set of test system. Test results show this cylinder’s friction is near 0 and it behaves reliable performance under stable pneumatic resource.
Cutting Forces when High-Speed Milling of SiCP/Al Composites
Authors: Ge Ying Fei , Xu Jiu Hua , Fu Yu Can
Published: August 2011

High speed milling tests were performed on the SiCp/2009Al composites to investigate the cutting forces by using PCD tools in the speed range of 600-1200m/min. The results showed that the peak value of the cutting force Fy (in the tool radial direction) was in the range of 700-1450N under the present cutting condition. The maximum amplitude of cutting force vibration in the tool radial direction can reach 700N. Cutting forces increased with increasing feed rate or radial depth of cut and decreased with increasing cutting speed. Negative rake angle and relatively large tool nose radius were recommended as far as cutting forces was concerned. Materials with higher volume fraction or smaller reinforcement particle size had the bigger cutting forces. T6 heat treatment can increase the cutting forces significantly but the using of coolant can decrease the cutting forces evidently.
The Cutting Optimization of the CNC Bothway Panel Saw under the Technology Constraint
Authors: Ma Yan , Yang Chun Mei
Published: August 2011

This paper is based on the urgent problem of furniture industry that is to increase the utilization of sheet material and improve the speed of sheet material discharging as the goal. To the problem of the cutting and nesting of the artificial board of CNC bothway Panel Saw analyses the “one size fits all” which under the technology constraint proposed the constrained condition of optimization of cutting. And optimization algorithm of two-dimensional sheet material nesting of rectangular pieces is studied and established a mathematical model. Using the Heuristic algorithm to solve the problem of two-dimensional rectangular pieces. The introduction of rules of location rules, combination rules and adjacency rules to make nesting layout reasonable and make the cutting process simplify.
A Measuring Technology for Retroreflective Materials of Horizontal Coatings
Authors: Li Wei , Zhu Chuan Zheng , Yang Yong
Published: August 2011

Now retroreflective materials are used widely in traffic field. Their quality influences road construction significantly. Effective evaluating of it is becoming a very important work. There are two methods chiefly: measurement set and handle instrument. Measurement set depends on the basic optical transducer. It has higher precision and lower error by comparing with handle instrument. Retroreflective materials as retroreflecive sheeting and raised pavement markers can be tested by choosing the two methods in accordance with different measuring conditions. But as for retroreflective materials of horizontal coatings, using handle instrument is common. So we make a detailed research on measurement set of them. By performing verification experiment, this measurement set is stable and the results are satisfied.
Research on Techniques of Structural Topology Optimization Using Cellular Automaton
Authors: Du Yi Xian , Wang Wei , Tian Qi Hua , Hu Jin Run
Published: August 2011

By integrating cellular automaton (CA) theory into topology optimization of continuum, the local rule is defined for sensitivity analysis and updating of the design variable, according to the analysis of the structural mechanical response. Topology optimization design of loaded structure is conducted using minimal compliance as the optimization objective. The optimal distribution of material in the design domain is finally obtained. Comparing to other algorithms, the local rule has proved to be computationally efficient to solve structural topology optimization problems. The resulting optimal structures are free of numerical instabilities such as the checkerboard patterns and mesh dependency.
Research on Product Knowledge Manipulation in KBE Application for Improving Product Design
Authors: Zhang Huai Yu , Wei Li Fan , Li Jia
Published: August 2011

In the process of customizing of CAD system for parametric product design, the modeling technology of product knowledge, the KBE (Knowledge Based Engineering) application architecture and technologies was studied. This paper proposed the classification standard for product knowledge base upon the methods of defining and representing ontological knowledge and procedural knowledge. Depending on the logic of product knowledge model, the function architecture of KBE software package embedded in CAD system has been constructed. Some practical technologies have been illustrated, like the visual interactive 3D annotation user interface base upon engineering semantic symbol, which can actualize the acquisition, representation, and ratiocination of knowledge. Using NXTM Open C and KF (Knowledge Fusion) as program language, all the methods for knowledge manipulation can be carried into execution in CAD system.
Effect of Chemical Composition on Quenching Hardness of 1Cr17Ni2 Stainless Steel
Authors: Du Wei , Chu Zhuang , Li Cheng Bin , Deng Xiang
Published: August 2011

In order to find the reasons of that the hardness of 1Cr17Ni2 stainless steel partial components after being quenched is weakened, based on the sampling analysis on the partial components to produces the components to carry on the sampling analysis, and to compare the contrast that the maximum of the hardness of quenched material is lower than (the average value of the hardness – the standard deviation) to that the minimum is higher than (the average value of the hardness + the standard deviation), we draw an exciting conclusion. The Cr content in steel is on the high side and the Ni content is on the low side. Especially the components present low hardness after being quenched whose C content is low, and the components present high hardness after being quenched whose C content is high. The reason why components have low hardness is that the contents of the element C and Ni to making Austenite in the 1Cr17Ni2 stainless steel is low, the contents of the element Cr to making Ferrite is high, and the martensite hardness is low and the Ferritecontents is high after being quenched.
Study on the Interaction of Rare Earth (La) and Strontium with Titanium and Boron in the Al-Ti-B Based Master Alloy
Authors: Peng Ji Hua , Deng Yao Feng , He Jian Ting
Published: August 2011

Al-Ti-B-Sr-RE master alloys were prepared firstly by the reaction of complex halide salts with molten aluminum at 800°C, and then the addition of Al-RE and Al-Sr master alloys into the melt. The constituent phase and microstructure were characterized by XRD, optical microscope (OM) and scanning electron microscope (SEM). The element content was analyzed by spectrometer, X-ray fluorescence spectrometry and electron probe microscope. Ti2Al20RE, SrB6, LaB6, Al4Sr and Al11La3are the constituent phases in these master alloys. The constituent phases containing Sr and RE in the Al-Ti-B master alloy depend on the ratio of Ti and B. The critical ratio of Ti and B is 2.2:1. Obviously, SrB6and LaB6phases are the reaction products of AlB2with Sr or La during master alloy fabrication. The two layer lump-like Ti-Al-RE particles formation mechanism is proposed.
Effect of Thickness on the Structural, Electrical and Optical Properties of ZnO Films Deposited by MBE
Authors: Yang Xiao Dong , Su Shi Chen , Xu Yi , Mei Ting
Published: August 2011

A set of ZnO films of different thickness have been deposited on sapphire substrates using molecular beam epitaxy (MBE) by varying the growth time and the effect of film thickness on the structural, electrical and optical properties have been investigated. The X-ray diffraction (XRD) results indicate that the full width at half maximum (FWHM) of the (002) diffraction peak is decreased as the film thickness increasing, and the stress along c-axis is stable. Scanning electron microscope (SEM) measurement shows that the grains become more uniform as the film grows thicker and the film surface present distinct hexagon shape as the film is grown up to a thickness of 500nm. The optical absorbance, Hall mobility and photoluminescence (PL) intensity are increased in accordance with the thickness of the film.
Dynamic Response Analysis on Efficacy of CFG-Pile in Different Height Embankment
Authors: Xiang Jian
Published: August 2011

In order to analyze the effect of embankment height to dynamic stability, Cross-section in the Beijing-Shanghai high-speed railway is chosen and the numerical simulation calculation method is applying. Distributing rules of dynamic displacement and dynamic stress of the subgrade surface and ground surface, attenuation rules of dynamic response and dynamic stress ratio between pile and soil on the vertical section were studied. It shows that the dynamic stress of pile and soil generally attenuates in depth and attenuation of dynamic stress ratio between pile and soil mostly concentrates into the scope of 10 meters beneath the ground. Moreover, with the increment of embankment height and attenuation of dynamic stress in direct proportion to the depth, the dynamic stress transferring to ground surface decrease and the dynamic displacement of ground surface minish. As a result, the scheme of CFG-pile with 3m scheme is superior to that of 2m scheme for enhancing dynamic stability and reducing dynamic displacement and stress in low embankment. It will be instructive to control design and construction for the low embankment in Beijing-Shanghai high-speed railway.
Detection of Infected Tephritidae Citrus Fruit Based on Hyperspectral Imaging and Two-Band Ratio Algorithm
Authors: Jiang Ying Lan , Zhang Ruo Yu , Yu Jie , Hu Wan Chao , Yin Zhang Tao
Published: August 2011

The Oriental fruit fly, Bactrocera dorsalis Hendel, is a serious pest insect for citrus fruits. The infected peel area can cause rot and fruit drop. However, there is no efficient automatic detection technology at this time that could detect the infected fruit. In this investigation, hyperspectral reflectance images were evaluated for detecting infected area on the citrus surface in the wavelength range between 500 and 950 nm. Optimum Index Factor (OIF) method was applied to identify the optimal band combination. Experiments result with a 97.5% recognition rate showed that hyperspectral imaging and proposed classification method were effective in differentiation of infected fruit and normal fruit. This study will lay a foundation for developing multispectral detection system used in on-line detection of infected fruit.
Utilization of Desulfurized Ash as a Modifier in Fluoride Retention and Deacidification of Fluorgypsum
Authors: Yang Xin Ya , Yang Qi Wei
Published: August 2011

In this paper, desulfurized ash was focused on modifying the properties of fluorgypsum and quicklime was as a reference. According to the results of water-soluble fluoride and pH value of fluorgypsum with modifiers, the optimal fluoride retention and deacidification effect was obtained by adding 1.5 % of quicklime, 5 % of desulfurized ash from power station (DA-PS) or 2 % of desulfurized ash from sintered flue gas (DA-SFG), respectively. The continuous hydration process of the cementitious pastes of fluorgypsum was investigated by scanning electron microscopy (SEM). The morphology of the gypsum crystals was of irregular particle shapes dispersing inside. In the later hydrating age, the distribution of pores became uniform, and the connection between the crystals overlapped more compact. Considered the modification effects on cementitious pastes, DA-PS could take place of quicklime to achieve the fluoride retention and deacidification of fluorgypsum.
Fabrication and Properties of Lignin/Castor Oil-Based Composites
Authors: Wang Hong Juan , Xiao Hai Yan , Sun Feng Qiang , Zhang Jian Hua
Published: August 2011

Novel bio-based composites were developed from maleate castor oil (MACO) and lignin through free radical initiated copolymerization between MACO and diluent monomer styrene(St). The morphology and structure of the composites were characterized by Fourier transform infrared spectroscope (FTIR) and scanning electron microscope (SEM). The mechanical and thermal behaviors of the composites were investigated, which showed the incorporation of a little of lignin in the castor oil based polymer can enhance the tensile properties of the matrix polymer greatly. This work provides a facile route to prepare bio-based composite materials from castor oil and lignin and can be extended to prepare other bio-based materials from reproducible resources.
Evaluation on the Blast Resistance of Fiber Reinforced Concrete
Authors: Nam Jeong Soo , Kim Gyu Yong , Miyauchi Hiroyuki , Jeon Young Seok , Hwang Heon Kyu
Published: August 2011

Recently, the damaged building and loss of life have been increasing by man-made disasters. In this study, the blast resistance performance of fiber reinforced concrete against explosion was evaluated by the emulsion explosive and AUTODYN. The concrete without fiber was penetrated by emulsion explosive of 4605 kJ/kg and its back side was fractured heavily. The concretes with PVA, PE and Steel fiber have a higher blast resistance than that of concrete without fiber. Consequentially, the blast resistance of concrete was analyzed from viewpoint of fracture mode by AUTODYN and it was concluded that the fiber content is a beneficial for the blast resistance performance of concrete.
The Preparation of Aluminum-Bronze/Steel Duplex Metal by Loose Sintering
Authors: Yang Qi , Huang Shun , Chen Jin Tian , He Guang Zhi , Yan Guo Zheng
Published: August 2011

Aluminum-bronze/steel duplex metal has been prepared by aluminum-bronze powder whose compact oxide film was removed by dilute HCl solution before sintering. Scanning electronic microscope (SEM), energy spectrum analysis (EDS), density measurement and compression shear strength test were used to investigate the structure, composition, relative density and bond strength of aluminum-bronze/steel duplex metal. The results show: liquid phase could wet the aluminum-bronze powder washed by acid, improve sintering activity of the powder and increase bond strength of aluminum-bronze/steel interface. The relative density of sintered aluminum-bronze is 99.6%, and shear strength of aluminum-bronze/steel interface is 132.6MPa.
A Powerful Discovery Procedure for Large-Scale Significance Testing, with Application to Comparative Microarray Experiments in Response to Different Biomaterials
Authors: Jin Pei , Zhang Jian
Published: August 2011

Several biomaterials have been widely used in the treatment of cancer. However, how these biomaterials alter gene expression is poorly understood. The problem of identifying genes that are differentially expressed across varying biological conditions or in response to different biomaterials based on microarray data is a typical multiple testing problem. In this paper, we focus on FDR control for large-scale multiple testing problems, by our proposed statistics and resampling method, a powerful FDR controlling procedure for large-scale multiple testing problems is provided. Simulations show that, our Fiducial estimator is accurate and stable than other five traditional methods, with satisfactory FDR control. In particular, we propose a generally applicable estimate of the proposed procedure for identifying differentially expressed genes in microarray experiments. This microarray method consistently shows favorable performance over the existing methods. For example, in testing for differential expression between two breast cancer tumor types, the proposed procedure provides increases from 37% to 127% in the number of genes called significant at a false discovery rate of 3%.
Preparation of Hydroxyapatite Powders via Neutralization Process
Authors: Xiao Xiu Feng , Wu Shan Shan , Zheng Xuan , Lu Yi Hua , Liu Rong Fang
Published: August 2011

Hydroxyapatite (HA) and Hydroxyapatite/Chitosan (HA/CS) composite were prepared through neutralization method. The results indicate that the way of adding phosphorous acid solution is a key factor to obtain pure HA product, and that prolonged stirring time only promote the entry of CO32- into the lattice of HA crystal. The addition of chitosan can overcome those factors which hamper the formation of pure HA particles, thus optimizing the whole reaction system.
Preparation and Characterization of Silver/Hydroxyapatite Nanoparticles
Authors: Guo Chao , Li Xin Xin , Dong Yin Sheng
Published: August 2011

Aggregation problem limits the use of silver nanoparticles (nano-Ag). Liquid chemical reduction method was used to fabricate silver/hydroxyapatite nanoparticles (nano-Ag/HA) by depositing nano-Ag on the surface of hydroxyapatite nanoparticles (nano-HA). The XRD result shows nano-Ag/HA is a hybrid composite of hydroxyapatite and face-centered cubic crystalline silver. The TEM result confirms the size and distribution of nano-Ag are dependent on the mass ratio of deposited nano-Ag and nano-HA, decreasing the mass ratio can obtain nano-Ag with smaller size and less particle aggregation, which can be contributed to the heterogeneous nucleation effect of nano-HA on nano-Ag. Silver/hydroxyapatite/alginate composite dressing was fabricated by spraying nano-Ag/HA onto the surface of the alginate dressing. The test result of disc diffusion method shows the evident antimicrobial activity against Escherichia coli (E. coli) is assigned to nano-Ag/HA, no significant difference can be found between the dressings with 0.01g and 0.02g nano-Ag.
Influence of Sb on Wear Resistance of In Situ Mg2Si/Al-Si Composites
Authors: Liu Niu Can , Li Jun Qing , Li Hai Dong
Published: August 2011

The microstructure and wear resistance of in-situ Mg2Si/Al-Si were studied in the different content of Sb. The result shows that when the content of Sb is 0.4%, the refining effect of primary Mg2Si granules in Mg2Si/Al-Si composite is best. The shape of Mg2Si turned into fine and even granules compared to the shape of Chinese character or treelike crystal before modification. At the same, the composite shows the best wear resistance and the loss of wear quality was reduced by 19%～37%. The improvement of the wear resistance by alloy elements is related to the modification of the Mg2Si granules and enhancement of the matrix. The main wear mechanism of in-situ Mg2Si/Al-Si composite is grain-abrasion.