bluuebunny/crossref_metadata_2025 huggingface dataset:
Porous NiO-SDC Carbonates Composite Anode for LT-SOFC Applications Produced by Pressureless Sintering
Authors: Jarot Raharjo , Muchtar Andanastuti , Wan Daud Wan Ramli , Muhamad Norhamidi , Majlan Edy Herianto
Published: March 2011

Composite anodes made of NiO and SDC-(Li/Na)2CO3 were investigated in relation to their structure, morphology, and porosity. As a first step, the anode powder was prepared by mixing the NiO with SDC-(Li/Na)2CO3 via solid state reaction in weight percentage of 60 : 40 wt% and in various compositions of carbonates (20 and 30wt%), namely NiO-SDC8020 and NiO-SDC7030, respectively. The powder mixtures were then calcined at 680oC. The resultant powder was fine with surface area of about 13.10-13.70 m2/g and an average particle size of 0.32-0.37µm. The powders consist of two phases i.e. the cubic NiO and face-centered cubic structure SDC-(Li/Na)2CO3 as confirmed with x-ray diffraction. The microstructures were observed under scanning electron microscopy (SEM). The anode pellets were later compacted at different pressures (27, 32 and 37 MPa) and sintered at 600oC. The optimum porosity (20.99-24.78%) was achieved for samples of NiO-SDC8020 and NiO-SDC7030 sintered at 600oC and cold pressed at 32 and 37 MPa.
Research on Condition Monitoring and Fault Diagnosis of Metallurgical Machinery and Equipment
Authors: Guan Zheng Rong , Li Jun Ping , Wang Xin Wu
Published: March 2011

Using the signal amplitude domain, frequency domain, bearing shock pulse measurement of bearings, gear boxes, motors and other rotating machinery vibration parameters for key components, through the accumulation of historical data and diagnosis, to predict in advance of equipment failure, for maintenance work to help provide a reliable and assurance purposes. The results show that the system does for the routine maintenance of production equipment has played a guiding role.
State Feedback Observer for Yaw Rate Based on the Nonlinear Vehicle Model
Authors: Wang Wei Da , Yuan Li Juan , Zhang Wei
Published: March 2011

Researching the estimating algorithm for the vehicle yaw rate is providing complement to the sensor measure and reference of the sensor diagnosis. If the estimating precision is good enough, the yaw rate sensor will be canceled and the cost of VDC system will be cut down. Based on the eight-DOF vehicle model and a modified Dugoff tire model which is simple and accurate, the estimation algorithm of vehicle yaw rate is proposed in this paper. The state feedback observer for yaw rate is designed and compared to the observer based on Kalman filter. The simulation results indicate that this algorithm can calculate vehicle yaw rate in real-time and the estimating precision is better than the Kalman filter in nonlinear condition. Therefore, the state feedback observer in this paper is proposing a low-cost and more practical idea for estimating the vehicle yaw rate on-line.
Design of Airport Snow Removal Operation Optimization and Dispatch System
Authors: Wang Li Wen , Yao Guo Peng , Wei Jiang Long , Shi Xu Dong
Published: March 2011

The airport snow removal operation optimization and dispatch system based on the GPS/GIS/GPRS technology and breadth-first search algorithm is designed in this paper. The airport snow removal vehicle is positioned by GPS system. The information between the vehicle mobile termination and the control center is transmitted by GPRS communication system. The graphic display and safety warning of the airport snow removal vehicle is realized by the GIS technology. The Breadth-first search algorithm is adopted to optimize the scheduling of operation and dispatch the snow removal vehicle. As a result, the efficiency of snow removing work can be improved and the delayed time of the airport opening in snowy day can be decreased.
The Research of the Optimum Design of Wireless Sensor Network
Authors: Liu Ban Teng , Wu Xue Jun , Wang Zhang Quan , Zhou Yin
Published: March 2011

Wireless sensor network is currently a hot research area of wireless communication system. In this paper, the optimum model of the wireless sensor network would be discussed; this can control natural disasters effectively and restore the loss of human. In the square area with fixed-side 100, place some sensor nodes whose coverage radius is10 in order to monitor the whole square. After careful calculation and comparison, proposed the reasonable scheme of how to place fewer nodes to cover the area as large as possible. Finally, I do the research of simulation and propose direction of optimization.
On the Motion Dimension Reduction by Laplacian Eigenmap
Authors: Jiang Hao , Xu Jie , Chen Zhuo
Published: March 2011

Laplacian eigenmap is used for motion dimension reduction. Eight Kinds of artificially typical 2D motion data are made as input of Laplacian eigenmap, and meaningful conclusions are obtained, which can be easily extended to complex data analysis in real applications. Advanced motion analysis methods have also been discussed briefly, such as 3D motion analysis, view independent motion analysis, pose representation and estimation as well as structural video analysis.
A Study on Cost Optimization of Steel Shot Blasting Systems
Authors: Pi Vu Ngoc , Chinh Phan Chi
Published: March 2011

This paper introduces a new study on cost optimization of steel shot blasting systems. In the study, the influences of blasting process parameters such as air pressure, nozzle diameter, cost components as well as the effect of the nozzle wear on the cleaning cost were investigated. For calculation of the optimum exchanged nozzle diameter (called optimum diameter) a regression model was proposed. By using this model, both cleaning cost and cleaning time can be reduced considerably.
Sensitivity Analysis and Optimization Disc Brake by Stress Constraints
Authors: Huynh Le Hong Thai , Němeček Pavel
Published: March 2011

In recent years, a lot of studies on brake of car aims to reduce stress, vibration and noise of the brake on vehicle. In this paper presents a sensitivity analysis of pressure and friction coefficient effect to stress of disc brake. Base on this result, an optimization for brake by stress constraints was performed. The results are shown that the contact area between disc brake and pad also it’s stress and pressure. Studies also have shown relationships between pressure, friction coefficient and stress of brake. After that, we optimize the model of disc brake by stress constraints to obtain the new model better. This is a pre study for studies on dynamic and vibration of disc brake.
Analysis on the Zoning and Initial Elastic Modulus of Main and Secondary Rock-Fill of CFRD Deformation
Authors: Mao Jian , Wang Zheng Zhong , Liu Quan Hong , Yu Xiao Kong
Published: March 2011

Based on Duncan-zhang nonlinear elastic model and ANSYS software, impacts on the settlement and stress of dam as well as the panel deflection are studied with different modulus of dam embankment materials and zoning of rock-fill dams. Through a variety of comparisons, the result shows that the dam settlement and the maximum deflection of panels increase as the initial elastic modulus ratio of main to secondary rock-fill rising. The ratio was much more reasonable within 1 - 2 and the dam deformation was small; 0.3 times top of the dam filled with high strength rock-fill materials might decrease settlement and panel deflection. The boundary line could be put forward to upstream appropriately to improve the utilization of soft rock with modulus ratio of main to secondary rock-fill less than 1.5 times.
Design of the Shearer’s Vibration Analysis Test System Based on LabVIEW
Authors: Zhao Li Juan , Lv Dong , Liu Yuan
Published: March 2011

In order to collecting, analyzing and processing the shearer body’s vibration data, we use Labview for data acquisition and signal analysis. By the computer to complete a range of its functions. Instead of the traditional instruments, Labview has a better programming convenience, strong function and flexibility.
Third-Order Volterra Kernel Identification Technique in Aerodynamics
Authors: Wang Yun Hai , Han Jing Long , Zhou Wei
Published: March 2011

In this paper, we will extend a Volterra identification technique of nonlinear systems. In reality there exists a large class of weakly Nonlinear System which can be well defined by the first few kernels of the Volterra series. In general, Engineers believe that identifying high-order Volterra kernels is a big problem and hope for the advent of better identification techniques. However, with the extensive development of the Volterra kernels’ identification technique, the situation may improve. The formulas used to calculate kernels up to the third-order are given.
The Research and Realization of the Product Design and Process Decision System Based on the Semantic Technology
Authors: Zhou Hong Gen , Tang Wen Cheng , Jing Xu Wen , Zhang Xiao Jun
Published: March 2011

After several decades of research, the traditional modeling methods, such as geometric model，feature model and integrated product model, can’t fully meet the integrated product information and the related knowledge that required. Meanwhile, lack of semantics, is not conducive to the using and sharing of knowledge. Semantic-based product design and process decision can shorten the product development cycle, reduce costs and allow the computer to participate in the design. Based on building of complex electronic products ontology and already been built OWL ontology file introduced into database, this paper combines Ontology model of complex electronic products with the semantic Web, studies a network design model based on the semantic Web and develops a product design and process decision Web platform based on semantic. The platform can realize product design, semantic search of the resources and decision of parts machining process, thus, to improve the productivity and enhance the efficiency and competitiveness of the company by the system.
Microstructure and Properties of Ni60 Self-Fluxing Alloy Coatings Fabricated by Spark Plasma Sintering
Authors: Xu Jin Fu , Ding Xiao Qin , Han Xiao Yun , You Hang , Wang Xian Rui , Liang Cui
Published: March 2011

We report the fabrication of Ni60 self-fluxing alloy coatings on the substrate of 45 steel via spark plasma sintering technique. The microstructure and interface bonding of the coatings have been investigated systematically. The results suggest that the as-prepared coatings possess fine grains, little porosity and with hard-phases (CrB, Cr7C3, Ni3B) dispersed within the substrate (γ-Ni). The coatings are jagged and embedded to the substrate due to the elements diffusion during the SPS process. A solid interfacial metallurgy bonding can be achieved between the coating and substrate and the hardness of the coating is ~597.5 HV0.3. The hardness of the transition layer present a gradient distribution ranged from 597.5 HV0.3 to 209.6 HV0.3. The bonding strength between the coating and substrate is measured to be ~710MPa. The volume abrasive wear rate of the coating is ~5.43 × 10-2cm3.
Design and Performance of a High-Efficiency Cell-Electrofusion Device
Authors: Yang Jun , Yang Jing , You Qing He , Hu Ning , Li Yong , Chen Jie , Li Ting Yu , Xu Jing , Cao Yi
Published: March 2011

A microfluidic cell-electrofusion device was developed for high fusion efficiency and automatic manipulation. It included an experimental platform, an electric signal generator and a microchip. Microstructure and controlling signal were elaborately chosen in order to realize precise cell manipulation, alignment and electrofusion. Compared with the traditional cell-electrofusion device, this device has some outstanding advantages. For example, short distance between two counter-microelectrodes will reduce the required voltage. A large number of microelectrodes can be fabricated on one small chip for high-throughput fusion. Transparent chip architecture benefited for microscopic observation and real-time recording. The integration of the experimental platform, signal generator and microchip is helpful for developing a portable cell-fusion system. On-chip electrofusion experiments of cucumber mesophyll protoplasts have been carried out and up to 40% fusion efficiency was obtained.
Design and Performance of a Microfluidic Particle Sorting Device
Authors: Yang Jun , Yang Jing , You Qing He , Hu Ning , Li Yong , Chen Jie , Li Ting Yu , Xu Jing , Cao Yi
Published: March 2011

A microfluidic chip device was developed for rapid and automatic particle sorting. The chip was made up of six individual layers. Each layer was used to implement different functions such as the sample loading, electric voltage loading, optic detection, cell sorting, and product extraction. Sheath flow was used to form single-row cells in order to let cells flow through the optic detection zone one by one. Optic fiber based detector could distinguish particles with different sizes. When a particle flowed through the light beam between two opposite optic fibers, it induced the dispersion of the incident light. The size of the particle was related with the strength of the scattering light. Thus, different particles could be distinguished. In the detection method, light path was simple and label was not required. Furthermore, optic fiber based detector was helpful to decrease the volume of the whole system. When desired particle was detected, it would be separated in the downstream by using an electric deflection method. Two types of particles with different sizes were sorted by using a prototype device. The result showed that these particles could be obviously distinguished. This microfluidic system could also be used to sort biological cells. Instantaneous electric field on the cells could prevent cells from severe injuries.
Improved Lazy Learning Based Dynamic Modeling Method on Combustion Process
Authors: Lei Qi , Wu Min , Wang Chun Sheng
Published: March 2011

This paper presents a new data-based method for the industrial combustion process. In this method, angle measure, which presents change trend of samples, is introduced in evaluating the similarity between the sample data and query data, which is not exploited in the previous word. And ARX method is used to build the local model. With the moving of working points, different models are set up to realize the accurate modeling for combustion process. An example of coke oven combustion process is presented to illustrate the modeling capability of the proposed method.
The Structure Design of Electromagnetic Clutch in the Adverse Circumstances
Authors: Feng Ding , Tan Bian You , Yuan Yong Xin , Wu Li , Zhang Hong
Published: March 2011

The trajectory control tool of high build-up rate well-bore, is such a kind of down hole tool that is used to control the well-bore trajectory of the extended reach well. Due to the complex working environment, so it is necessary to design a special electromagnetic clutch. Firstly we should analysis the hostile working environment of the special electromagnetic clutch. The slipping toothed electromagnetic clutch is selected and structural design is going on to adapt the hostile working environment. In order to meet requirements of meshing when the axis is turning, armature ring gear has been designed specially. The reliability of the design also has been checked and it is proved that such kind of design can meet requirements of working under the hostile environment.
Honeycomb Paperboard Dynamic Properties Modeling and Parameters Estimation Using Free Response Data
Authors: Zhu Da Peng , Zhou Shi Sheng
Published: March 2011

A linear differential equation is adopted to account for the complexity of honeycomb paperboard properties under static and dynamic conditions. Based on the Laplace transform, honeycomb paperboard is modeled as a linear material with viscoelastic property. The free response of the mass loaded honeycomb paperboard system is expressed as the sum of complex exponentials. The residues and eigenvalues are obtained accurately using the structured nonlinear total least norm(SNTLN) method. A parameters estimation procedure is formulated using a substitution strategy. A experiment system is set up, a series of tests is carried out under different load condition, the free response data of the mass loaded honeycomb paperboard system are recorded and they are used to estimate the parameters. The stiffness coefficients, damping coefficients and viscoelastic coefficients are presented as the function of the load. The model in this work can be used to simulate the response of the mass loaded honeycomb paperboard system under shock condition.
Analysis of Pneumatic Vibration Isolator Considering Diaphragm Stiffness
Authors: Ji Chun Hua , Zhu Yu , Xu Deng Feng
Published: March 2011

An accurate model of pneumatic isolators is important for its structure optimization and controller design. Previous researches show that an isolator model including the diaphragm effect which is neglected before can predict the isolator response more accurately. Since the diaphragm is often made of reinforced rubber material and has an irregular shape, it is not easy to obtain its parameters with experimental or computing method. A finite element analysis method for estimating the diaphragm stiffness is proposed in this paper, and experimental results suggest that a new model including the diaphragm stiffness correspond to the isolator behaviors more accurately.
Shamir Threshold Based Encryption
Authors: Gan Xiao Ying , Liu Bin
Published: March 2011

This paper Shamir threshold scheme based on the protection of private keys, by constructing a Lagrange interpolating polynomial to achieve in the real environment using the key shared information systems, computation and communication in the case of less , the program can prevent the system key is lost, damaged, and from the enemy's attack, reduce the responsibility of the key holder, but also can reduce the success rate of an adversary to decipher the key. An example is the feasibility of the program.
Research of Trusted Network Security Technology
Authors: Gan Xiao Ying , Liu Bin
Published: March 2011

Based on the TNC architecture, using a trusted network of repair techniques in the trusted network access scenario does not meet the requirements of integrity verification solution for end users. Put forward a credible fix the overall network design, reliable model restoration and repair services, network workflow. The system is in need of restoration to provide safe and reliable repair end-user data transmission, providing a humane, reasonable repair services to ensure the credibility of fixed network and the isolation effect of the terminal to be repaired and strengthened the security of fixed server. Realized the classification of various types of repair resources management, restoration of resources in ensuring the transfer of fast, reliable, based on the performance with a certain extension.
Free Vibration of a Cylindrical Shell with Varied Initial Stresses in Different Longitudinal Sections
Authors: Li Dao Kui , Lei Yong Jun
Published: March 2011

An exact and closed-form solution is obtained for free vibration problems of homogeneous isotropic cylindrical shells, which is under arbitrary boundary conditions and with varied initial stresses in different longitudinal sections. First, the cylindrical shell is divided into multiple sub-shells according to their thicknesses and initial stresses. And the displacement functions of the sub-shell’s middle plane are expanded as trigonometric series in circumferential direction. Then, based on the simplified Donnell shell theory, a set of fundamental dynamic equations, which take initial stresses into accounts, is derived through Hamilton’s principle for each sub-shell. Correspondingly, boundary conditions and connection conditions are derived too. These equations and conditions are simplified through setting the displacements varied in harmonic form. Finally, through defining the state vector, the dynamic equations and solution-determine conditions are described as state-space forms and solved conveniently. Numerical examples validate this method. Driving process of analytical solutions show that it is convenient for introducing and dealing with solution-determine conditions and solving the dynamic problems of cylindrical shells with varied initial stresses in different longitudinal sections.
Cumulative Seismic Damage of Reinforced Concrete Columns: Benchmark and Low-Cycle Fatigue Tests
Authors: Pan Yuan , Xing Guo Hua , Fu Guo , Hou Jian Ling
Published: March 2011

Under seismic actions, reinforced concrete columns are generally damaged by a combination of repeated stress reversals and high stress excursions. An experimental study was undertaken to investigate cumulative damage in reinforced concrete rectangular columns subjected to repeated cyclic loadings. Fourteen identical half-scale concrete columns were fabricated and tested to failure. This paper summarizes the results of Phase I testing that consisted of benchmark tests to establish the monotonic force-deformation envelope, and constant amplitude tests to determine the low-cycle fatigue characteristics of typical flexural columns. A companion paper will present the results of variable amplitude tests to develop an analytical model of cumulative damage for rectangular reinforced concrete columns. Test observations indicate two potential failure modes: low cycle fatigue of the longitudinal reinforcing bars; and confinement failure due to rupture of the confining hoops. The former failure mode is associated with relatively large displacement amplitudes, while the latter is associated with a larger number of smaller amplitude cycles. A fatigue life expression is developed that can be used in damage-based seismic design of rectangular, flexural concrete columns.
Study on the Influence of Magnetism and Specific Gravity of Synthetic Diamond Abrasive Particles on their Mechanical Performances
Authors: Luo Zhong Ping , Yao Ya Lin , He Bing , Xia Zhi Hua
Published: March 2011

In this paper, static-pressure strength, toughness index (TI) and thermal-toughness index (TTI) of each sample have been analyzed on the basis of the experimental studies on the magnetic separation and heavy liquid separation of diamond abrasives. The results show that the magnetism of synthetic diamond abrasives has an obvious influence on their mechanical performances. With the increase of magnetism, synthetic diamond abrasive particles becomes darker and darker in appearance color, and have more bubbles, impurities and defects inside the particles, furthermore, their surface fineness observed under the microscope will be found worse. While, the static-pressure strength, the TI under the normal temperature and TTI all become lower and lower. But the influence on the static-pressure strength and the TI is smaller, however the influence on TTI is the greater. The specific gravity of synthetic diamond abrasives has little influence on their mechanical performances.
Clad Strip Casting by a Roll Caster
Authors: Haga Toshio , Nakamura Ryoji , Kumi Sinji , Watari Hisaki
Published: March 2011

Casting of clad strip, which was one of the composite alloys, was tried using a roll caster. A vertical tandem type twin roll casters for clad strip were designed and assembled to cast the clad strip. Three layers of clad strip could be cast. The interface between the base strip and overlay strip was clear. The as-cast clad strip could be cold rolled without peeling at the interface. The element of the each strip did not diffuse to another strip at the interface. The effects of the roll speed and melt temperature of the overlay strip on the cladding of the strip were investigated.
Structure Synthesis of Two-Translation and Two-Rotation Parallel Mechanisms Based on the POC-Based Approach
Authors: Yan Yang , Luo Yu Feng , Shi Zhi Xin , Yao Wei Ke , Yang Ting Li
Published: March 2011

A systematically approach for structure synthesis of parallel manipulator is based on position and orientation characteristic (POC) matrix, by which a detailed application is focused on the synthesis of 2-translation and 2-rotation parallel mechanisms. The result synthesized involves not only part known mechanisms, but also some novel mechanisms. This paper synthesizes SOC branches which include 2-translation and 2-rotation output, classifies synthesized parallel mechanisms based on SOC branches types, analyses and research this kind parallel mechanism.
Realization of Atomizing Animation for Spraying Based on OpenGL in the Electrostatic Oiler
Authors: Wang Zhao Hui , Gao Quan Jie , Wang Jia Qing , Chen Xin
Published: March 2011

For principle of the particle system, using Visual C++ combining with the object-oriented technology and open graphic library method, the shapes of oil atomization under different voltages were simulated. By comparing the simulating images with the experimental pictures, charged oil atomization process was basically reflected by the simulated results, and it was correspondent with the experimental observation.
The Finite Element Models for the Built Ting Kau Bridge
Authors: Jiang Rui Juan
Published: March 2011

The Ting Kau Bridge in Hong Kong is a cable-stayed bridge comprising two main spans and two side spans. The bridge deck is supported by three towers, an end pier and an abutment. Each of the three towers consists of a single reinforced concrete mast which reduces its section in steps, and it is strengthened by transverse cables and struts in the transverse vertical plane. The bridge deck is supported by four inclined planes of cables emanating from anchorages at the tower tops. In view of the heavy traffic on the bridge, and threats from typhoons and earthquakes originated in areas nearby, the dynamic behaviour of long-span cable-supported bridges in the region is always an important consideration both in their design and health monitoring. This paper describes the development of the 3D grid model for the structural health monitoring of the bridge. The 3D grid model is intended to form the backbone of subsequent multi-scale finite element models for bridge rating. The baseline model is built up and calibrated to match the bridge geometry and cable forces specified on the as-built drawings. The modelling of the concrete deck in the simplified grid model is an important issue as it has great effect on the lateral and torsional vibrations of the bridge. This paper examines in particular the shear lag effect on the modelling strategy.
Theoretical Modeling and Experimental Verification for Structural Response of NOPD Based on Endochronic Theory
Authors: Wang Wei , Li Yu Yan
Published: March 2011

Non-obstructive particle damping (NOPD) is a new composite damping technology based on traditional partical damping and impacting damping, and it has good vibration-reduced results. Through studying thermodynamics constraint condition for non-inverse variation of inner tissue structure of the material, the endochronic theory obtained variation regularity of inner variable, further gave out evolution path of specific non-inverse thermodynamics variable under specific condition, and thus the constitutive relationship of the material was obtained. Based on endochronic theory, an incremental form of the endochronic constitutive relationship of discrete particle was derived, and then penalty element was introduced to solve the connection problem between structure and discrete particle, lastly finite element dynamics equation of NOPD composite structure was constructed. Based on the model of NOPD composite structure, simulation and experiment for response of NOPD free beam were made. It indicated that applying endochronic theory to analyze the response of NOPD is rational, which supplied an effective method for engineering application of NOPD.
Effect of Dilation-Angle on Combustion Characteristic in Two-Phase Combustion Chamber with Dilative Entrance
Authors: Lu Hai Bo , Liu Wei Qiang
Published: March 2011

The GO2/ethanol/water tripropellant evaporation and combustion in axisymmetric combustion chamber was numerically simulated. The different characteristics of the evaporation and combustion between dilative and traditional un-dilative entrance, and the different dilation-angles of the combustion chamber entrance are analyzed. The results indicate that the dilative entrance combustion chamber is benefit for thermal protection of the injection, and the flamelet backpedals with increase of the entrance dilation-angle. At the same time, that dilative inlet combustion chamber reduces the evaporation of the liquid component seriously. The evaporation rate decreases with the increase of the dilation-angle at first, but after the dilation-angle is bigger than a critical one, it increases.
The Practice and Thinking on Innovation of Information Technology Curriculum Teaching
Authors: Dong Chen
Published: March 2011

The aims that indicated in "The Guidance Outline on Elementary and Middle Schools Information Technology Curriculum” are to enable students to have abilities of acquiring, transmitting, processing and applying information through learning information technology courses; cultivate them to have good information literacy; make information technology as a significant way of supporting for lifelong and cooperative learning, laying a necessary foundation of adapting to the study, work and life in information society. With the application of multimedia computers and networks, education and teaching have undergone profound changes that the integration of information technology and subject teaching (or course) has become the focus in educational reform, so how to integrate instruction with the information technology curriculum I think the idea that combing with other subjects teaching in the information technology curriculum to carry out thematic inquiry learning not only can achieve unique effects, but also is a win-win teaching model of information technology and other teaching courses. This paper aims at exploring the positive ways and meaning of the integration of information technology and other subjects through thematic inquiry learning cases.
Compensation Design of CIC Decimation Filter for Seismic Prospecting
Authors: Qi Jian Zhong , Cao Li Jun
Published: March 2011

In seismic prospecting, the over sample combined with low quantity is used to converter input analog signals to 1-bit data flow. In order to realize decimation filtering for the high speed low resolution signal produced in the process of seismic prospecting, the CIC decimation filter is introduced into seismic survey system to achieve decimation and filting. The principle and the shortcoming were analyzed; finally an ISOP filter is introduced to compensate the pass-band attenuation, Simulation showed it could improve the performance of CIC filter, the cascade of CIC and ISOP is suitable for seismic prospecting system.
The SOCs Modular Method for Kinematic Analysis of Complicated Parallel Manipulators
Authors: Shi Zhi Xin , Ye Mei Yan , Luo Yu Feng , Yang Ting Li
Published: March 2011

This paper presents a simple and systematic modular approach for kinematic analysis of complicated Parallel Kinematic Manipulators (in short, PKMs) which coupled degrees are more than 2. (1) Single open chains (in short, SOCs) may be regarded as the basic modules of a PKM. Any PKM can always be decomposed automatically into a set of ordered SOCs, and these SOCs can also be used to recognize the basic kinematic chains contained in it. (2) The kinematic analysis algorithms and the compatibility conditions of the SOC modules are offered. (3) Directly applying the above SOC kinematic modules, the kinematic equations of a PKM can be automatically established. (4) In order to solve kinematic equations of complicated parallel manipulators which coupled degrees are more than 2, a new searching algorithm which requires no initial guess has been presented. The procedural approach is demonstrated in parallel manipulators.
Design of the Precision Detection Device for the Key Dimension of Bending Mold
Authors: Tong Ji Bin , Yuan Hui , Wang Yong Ming , Yu Xiao Liu
Published: March 2011

The key to guarantee bending mold interchangeability is the precise detection of the cutting edge angle, symmetry and the distance from its center to the fitting surface of CNC bending mold. According to the features of the Key Dimension of the Bending Mold (KDBM), it is detected using a 3-DOF mechanical arm connected in series. The mechanical arm has a horizontal DOF, a vertical DOF, and a rotational freedom of the gauge head which is placed at the end of the mechanical arm. The Precision Detection Device (PDD) for KDBM that we have designed has high accuracy, good stability and rapid response.
Synthesis of Layered Ti2Al(N0.5C0.5) by a Combination of High Energy Milling and Hot Press Sintering
Authors: Zhu Jian Feng , Han Na , Wang Kun , Wang Fen
Published: March 2011

Elemental mixture of Ti, Al and C was high energy milled in a planetary ball mill under high-purity nitrogen gas protection and then hot pressed. The fully dense bulk layered ternary Ti2AlN0.5C0.5 with sub-micron grain size was successfully obtained. The phase formation and transformation in high energy milling and subsequently hot press sintering were studied in detail by using X-ray diffraction (XRD). Scanning electron microscopy (SEM) linked with energy dispersive spectroscopy (EDS) was used for the structural and compositional analysis. The formation mechanism was also discussed.
Uniaxial Tensile and Cross-Sectional Indentation Tests to Investigate the Adhesion between the Brittle Cr Coating and the Ductile Steel Substrate
Authors: Yang Ban Quan , Chen Guang Nan , Chen Xue Jun
Published: March 2011

Adhesion of a coating on its substrate is a crucial parameter determining performance and reliability of coating-substrate system. In this work, the uniaxial tensile and cross-sectional indentation tests are used to investigate the adhesion between the brittle Cr coating and the ductile steel substrate. The uniaxial tensile test results show the maximum shear flow stress level of the ductile steel substrate can only serve as a lower bound estimate on the ultimate shear strength of the interface. The cross-sectional indentation test results show the interfacial decohesion does not occur prior to the cracking of the brittle Cr coating.
Milling Machine Design Based on Open CNC System
Authors: Cao Shu Kun , Yang Shang Wei , Chen Xiu Sheng , Wang Gui Cong , Song Wei Wei
Published: March 2011

Completed structure of milling machine design based on open CNC system through the combination of multi-axis motion controller and the way of NC embedded PC. The traditional CNC milling machine combined with technology of many aspects of Precision machinery, electronics, electric drive, automatic control, automatic detection, and computer and so on. High-precision high efficiency and high flexibility of the CNC milling machine makes it has more widely applications. But there are some problems, for example, based on the traditional CNC milling system for work-piece processing is also not very convenient, and traditional CNC system must be G code programming first, then process work-piece, in addition, as the closed nature of traditional CNC systems, products of hardware and software of the CNC manufacturers are not compatible, and system’s training and maintenance costs much, we put forward the open CNC system, then we start to research and analysis the Milling Machine Design Based On Open CNC System.
Symmetry’s Applications to Bihamonic Equation and the Generalized Solution of Elasticity Problem
Authors: Qin Jian , Huang Ke Fu
Published: March 2011

The generalized elasticity solutions are obtained in this paper by symmetries from Lie transformations. The symmetries of the bihamonic equation are obtained by mathematica package SYM. The several invariant solutions are found by solving the corresponding ordinary differential equations from Lie transformations. The superposition of invariant solutions, corresponding to an eigenfunction expansion, could yield the generalized elasticity solutions in rectangular coordinates and polar coordinates, where the eigenvalues arises from the invariance of bihamonic equation.
Detection of a Crank in the Stephenson-Ш Six-Bar Linkage
Authors: Zou Yan Huo , Chu Jin Kui , Guo Xiao Ning
Published: March 2011

Detecting the existence of a crank in the Stephenson-Ш six-bar linkage is one of the most difficult problems encountered in the mechanism synthesis. Based on the model established for the circuit analysis of the Stephenson six-bar chains, through judging whether there is a dead-center position in the circuits of this linkage, this paper presents a new method for identifying the existence of a crank in the Stephenson-Ш six-bar linkage. Some examples are given to demonstrate the validity of this method.
Micro Powder Injection Molding (µPIM): Review
Authors: Yunn Heng Shye , Muhamad Norhamidi , Sulong Abu Bakar
Published: March 2011

Micro powder injection molding (µPIM) is the combination of micro injection molding and powder injection molding (PIM) technology. The increasing demands on market of microparts further intensify the development of this technology. µPIM process enables the use of a wide range of materials and broadens the applications of micro components. This process is well suitable for large volume production of micro-components at low costs. Requirement of powder and binder is more stringent since product fabricate in micron scale, therefore criterion of the powder and binder has been reviewed in this paper. In addition, the process parameter and development in the computer aid plays an important due to the narrow process window requires even tighter as the quality of the micro-component is sensitive to the parameter. This paper outlines recent development in µPIM. Challenges and further explore for µPIM is concluded in the last part of this paper.
Dynamic Research of the Split-Pillar Rotation Process for Electroslag Remelting Furnace
Authors: Wang Chang Zhou , Liu Xi Liang , Song Jin Chun , Zhang Zhi Wei
Published: March 2011

Electroslag Remelting (ESR) technology is a main method of special metallurgy; and split pillar is one of the most important mechanical units of ESR. The split pillar works not only as the mother body of ESR cross arm, but also as the rotation driving device of the cross arm. Since the tremendous mass of the cross arm and electrodes, serious inertia torque generates when the split pillar rotates, which leads to motion instability and problems of angle location and even safety threatens. In this paper, based on virtual machine technology, dynamic research of the rotation process of the electroslag-remelting-furnace split pillar was proceeded; influences of driving torque applied on the split pillar was researched, as the driving torque being constant, anti-step and with brake torque. 3D solid model of the split pillar and clamping device were established; main technical parameters were accomplished; and simulation research of the dynamic process was proceeded. It was found that, appropriate brake torque was important to better motion stability of the split pillar. The best brake torque was acquired, and the action time of the brake torque was obtained.
Implement and Application of Feature-Based Visibility Analysis on UG Flat
Authors: Wang Hui Feng , Zhou Xiong Hui , Zhang Yong Jun , Han Jing Tao
Published: March 2011

A new algorithm, named feature-based visibility analysis is proposed. This algorithm can be used widely in manufacture and process of parts or models. Compared with conventional triangle facet algorithm, the proposed feature-based algorithm can get global visibility more efficiency and accurately. The main visibility analysis consists of two steps: 1) Local visibility analysis. All features are classified into two types-features with local visibility and without local visibility. 2) Global visibility analysis. All features with local visibility should be analyzed further to detect whether the local visibility feature is sheltered by the other part of the model. In this paper, related principle and implement process (on UG flat) are introduced detailly. At last, the case study demonstrated the validity of the proposed method.
Analysis of Influence Factors of Temperature Stress for Open-Graded Large Stone Asphalt Mixes of Asphalt Pavement
Authors: Guo Hong Bing , Chen Shuan Fa
Published: March 2011

The reflective cracking is one of the main damages of semi-rigid base asphalt pavement and rigid base asphalt pavement, how to control its emergence and development is still a major problem for road engineering. At present, researches on mechanical behavior of Open-graded Large Stone asphalt Mixes (OLSM) in China almost remain in the test road observations, very few study it from the point of the finite element theory. Aiming at this problem, a method of using OLSM as the cracking alleviation layer is proposed. The calculation principles of temperature stress of lean concrete base asphalt pavement with OLSM has been introduced, on the basis of the finite element software of ABAQUS, 3-D Finite Element Method (FEM) is used to analyze temperature stress for OLSM of asphalt pavement, the influence rule of pavement design parameters for its temperature stress has been discussed, and the theoretical basis for structural design of asphalt pavement with OLSM has been found.
Numerical Simulation of Fire in Logistics Center
Authors: Zhang Jing Jing , Qi Qing Jie , Xu Chan Juan
Published: March 2011

Goods and shelves are closely and numerously put in the logistics center, so there are many hidden dangers. People’s life safety and property safety are threatened by fire. The key of putting out fire and evacuating people is to grasp the changes of the important parameters in the fire. In this paper the FDS (Fire Dynamic Simulator) software developed by the U. S. National Institute of Standards and Technology (NIST) is used to build a fire model and sets two fire scenarios to analyze the fire spreading process in logistics center. According to the numerical simulation results, reasonable suggestions are put forward in the end.
Why Can SVM Be Performed in PCA Transformed Space for Classification?
Authors: Zhang Jian , Bo Li Ling , Xu Jia Wei , Park Seop Hyeong
Published: March 2011

PCA plus SVM is a popular framework for classification problems. On the one hand, it can avoid the SVM kernel Gram to become overlarge and save storage space. On the other hand, PCA plus SVM approach has been verified effective for classification by experience. This paper focuses on building a theoretical foundation for this framework. By derivation, the equivalence relation between PCA plus SVM and LDA is discovered for binary classification. Moreover, we give a specific analysis about the framework to validate our viewpoint compared with SVM and combined SVM/LDA on ORL face database, Yale face database and real world benchmark data. The experimental results indicate that SVM can be performed in PCA transformed space for classification.
MD Simulation of CO2-CH4 Mixed Hydrate on Crystal Structure and Stability
Authors: Qi Ying Xia , Zhang Hua
Published: March 2011

MD simulations are carried out on the sI CO2-CH4 mixed hydrates in the constant-NVT and constant-NPT ensembles for the two cases of CO2 occupancy. One is 75% called normal, the other is 87.5%. The simulations results show that the hydrate structure can be maintained both for the two hydrates over the temperature range of 0K to 300K. However, the equilibrium pressure, the potential energy and the MSDs of the atoms in H2O for the higher CO2 ratio hydrates is larger than that of the normal CO2 ratio hydrates, indicating that the normal mixed hydrates is more stable than the higher CO2 occupancy mixed hydrate. These results are consistent with the present experimental results.
Study on Influencing Factors on Removal of Diesel Oil from Unsaturated Zone by Soil Vapor Extraction
Authors: Jiao Li Na , Zhao Yong Sheng , Qu Zhi Hui , Wang Bing
Published: March 2011

This paper deals with the influencing factors on removal of diesel oil from by soil vapor extraction (SVE) method. A series of one-dimensional column experiments were conducted to study the influencing factors for SVE method, the factors included extracted vapor flow rate,water content and the concentration of the contaminant. The results indicated that: (1) the increase of vapor flow rate led to higher contaminant removal efficiency,but the increment of removal was not significant at higher flow rate levels;(2) the moisture content is 12% coarse sand elimination rate is bigger than 1% coarse sand;(3) the soil index of oil is higher, the extraction time to be longer, it is not suitable processes with SVE that the diesel oil density is excessively low.
Preemptive Open-Shop Scheduling: Network Flow Based Algorithm
Authors: Zhan Yong , Zhong Yu Guang , Zhu Hai Tao
Published: March 2011

Preemptive open-shop scheduling problem was studied, and a network flow based algorithm was presented. Firstly, based on the characteristics of the preemptive open-shop, the scheduling problem was formulated as a mixed-integer programming model with the objective to minimize the make-span. The maximum flow model of the preemptive open-shop was developed to model the machine resource allocation and time constraints. Moreover a new preflow push algorithm for the maximum flow model was put forward. Based on the solution of machine resource allocation problem got by preflow push algorithm, the sequences of the tasks processed by each machine were determined by calculating the matrix of the processing times and decrementing set. Finally, the validity of the developed scheduling algorithm is illustrated by randomly generated example.
Application of Visualization in Scientific Computing Technology
Authors: Liu Ji Peng , Yan Fang , Zhao H.L.
Published: March 2011

Visualization in scientific computing technology can be used in architecture industry and related field, to transform three-dimensional data into images, and assist architectural design，construction, decoration, urban planning, etc. Its effect is very good. In this paper we first introduced the concept of visualization in scientific computing technology, and explained its basic methods and application areas. Then we discussed its application in the architecture design, construction ,decoration, and urban planning, and analyzed its future development prospects. Reasonable suggestions have been pointed out to promote the effective application of scientific computing visualization technology in architecture industry and related field.
Product Ergonomics Design Driven by Parametric Human Body Model
Authors: Jiang B. , Lu Chun Fu , Liu Xiao Jian
Published: March 2011

Considering the demands for product ergonomics design, the paper proposed a driven design method for product’s shape and structure design through the manipulation of human body models. Based on the anthropometry data, a parametric human body driving model system is established with three layers, which are structure model, dimension model and surface model. The driven design method of product ergonomics design is realized, in which human body data are directly mapped to product design parameters. The driven design method provides a rational way to utilize ergonomics design principles and guarantee higher efficiency and more reliability. The method is tested in seat design examples.