bluuebunny/crossref_metadata_2025 huggingface dataset:
Feature Extraction on Medical Image Using 2D Gabor Filter
Authors: Zainudin Muhammad Noorazlan Shah , Mohd Said Muzalifah , Ismail Mohd Muzafar
Published: March 2011

Mammography is a specific type of imaging that produces an X-ray picture of the human breast. Detection of tumors at an early stage is important step in diagnosis of the abnormalities in mammograms. In many of the cases, preprocessing process of the raw image involving of enhancement, filtering and determination of textural features have been necessary for successful implementation of this study. Raw image is applied histogram equalization method in order to enhance the image intensity. Thus, the noise of that image is eliminated using Gaussian filtering method. Gabor wavelet based algorithm such Gabor filter is used to extract the feature of that images.
Numerical Method Approaches in Optical Waveguide Modeling
Authors: Ismail Mohd Muzafar , Zainudin Muhammad Noorazlan Shah
Published: March 2011

Optical waveguides have been known as basic structure in integrated optics. The result of waveguide analysis is very useful to apply before fabrication process begins. In this paper, optical propagation characteristic of straight waveguide on light intensity distribution within the structures have been investigated at 1.55 micrometer waveguide. The normalized propagation constant b and effective refractive index neff conditions have been considered for the straight waveguide for single mode propagation. Both the propagation characteristic can be calculated efficiently on the personal computer by using MATLAB programming. The analysis has been analyzed using a numerical method based on finite difference method approach. The result of optimization analysis of waveguide according to the parameter study can help in practical work in designing an optical waveguide easily.
Logistic Information Perception Interactive System Formed by Combination of RFID and TC35i
Authors: Yang Yuan Li
Published: March 2011

By analysis on the realization for RFID (Radio Frequency Identification) technology, TC35i module of CTI (Computer Telecommunication Integration) technology, this article provided a solution and technology realization method for Logistic Information Perception Interactive System. The Logistic Information Perception Interactive System is a combinational application of Internet Of Things (IOT)) RFID, CTI and internet technology, the system consists of three levels system structure of perception level, network level and interaction level, which is supported by RFID reader, RFID logistic tag, TC35i module and other software and hardware as well as interface technologies, integrates and build logistic business flow and information perception interactive section link for supply chain, forms interactive system of RFID logistic, TC35i equipments, user mobile communication, internet communication and other sections. In the Logistic Information Perception Interactive System, it uses AT signal, API (Application Programming Interface) interface program to design short message logistic business interactive program based on TC35i and RFID, realizes isomerism application of communication, technology in terms of logistic information application means, realizes the ubiquitous links and distribution management of perception logistic.
Optimal Matching of Processing Parameters of Horizontal V-Shaped Anvils for Heavy Axial Forgings Manufacturing
Authors: Li B. , Yu J. , Yu Suo Qing , Wang A.B. , Jiang Y.H. , Zhang Y.H.
Published: March 2011

The forging method with horizontal V-shaped anvils (HVA) is effective in the control of inner stress states, metal tissue, etc. FEM numerical simulation is conducted for the HVA forging method, under various processing parameters. The results show that during HVA forging, the transversal and axial stress states in the middle part of forgings are influenced by not only the ratio of the anvil width to billet height (anvil-width ratio )but also the ratio of the blank width to billet height (blank-width ratio) and the reduction ratio, while the end parts are influenced little. Among those processing parameters, the reduction ratio plays an important role. When the reduction ratio is 5% or 10%, it is possible to obtain axial and transversal tensile stress. When the reduction ratio is larger than 15%, it is easy to obtain two-way compressive stress. Therefore, in order to control the two-way tensile stress, big reduction ratio should be adopted. Small blank-width ratios result in the forgings cracks because of transversal tensile stress in common flat-anvil stretching method. On the contrary, even if the blank-width ratio is small, transversal compressive stress can be generated in forgings for the HVA forging method, only if the matching of the anvil-width ratio and the reduction ratio is suitable. The feature of the HVA forging method benefits the preventing forgings from inner cracks. The results provide the theoretical foundation for the application of the HVA forging method.
Preparation and Characteristics Analysis of PVA Hydrogel for Substituting Creatural Soft Tissue
Authors: Jiang Shan , Cheng Gong , Liu Sha , Feng Wen Hao , Zhang Zhen , Yang Zhi Yong
Published: March 2011

Biopsy precious research has an important relationship with treatment efficiency and side effect complication. Most of the investigation is focus on the non-creatural material which is used to substitute creatural soft tissue for precious research. The aim of this paper is to develop a prescription that can be used for opaque and transparent PVA making which has similar mechanics property to the creatural tissue. The preparation, characteristics, and the results of PVA hydrogel on the composite material are studied as the key investigation. Porcine liver tissue property is also tested as a consultant for PVA material preparation. Comparing with the liver tissue test result, certain component ratio and freezing-thaw circle are determined. This PVA hydrogel material shows big potential in the creatural material substitution application. This research will benefit others who are interested in using non-creatural material to do experiment or surgical technology training.
Influence of the Obliquity of Fin Ray on Propulsion Performance for Biorobotic Underwater Undulating Propulsor
Authors: Zhang Yong Hua , He Jian Hui , Zhang Guo Qing
Published: March 2011

This paper aims to understand influence of the obliquity of fin ray on its motion performance. An environment-friendly propulsion system mimicking undulating fins of stingray had been built. Investigations were presented by using three-dimensional unsteady Computational Fluid Dynamics (CFD) method. An unstructured, grid-based, unsteady Navier-Stokes solver with automatic adaptive remeshing was used to compute the unsteady flow around the fin through twenty complete cycles. The pressure distribution on fin surface was computed and integrated to provide fin forces which were decomposed into lift and thrust. Vortex contour maps of the fin with different obliquity of fin ray were displayed and compared. Finally, we draw a conclusion that the generated propulsion force of the biomimetic propulsor is gradually increase with the obliquity of the fin ray from 0 degree till a certain angle and then gradually decrease with the obliquity of the fin ray from the certain angle till 90 degree. The results provide valuable information for the optimization of robotic underwater undulating propulsor design.
Biological Effects of Far-Infrared-Ray Hot Compression on Superoxide Anions in Human
Authors: Lin Chun Chih , Hsieh Ying Yeh , Liu Wei Chung , Lee Moon Sing , Lung Chia Chi
Published: March 2011

Among the infrared spectrum, the range of 4-14 μm belonging to far-infrared (FIR) spectrum is named as “growth rays” due to many beneficial effects represented on organisms. Recently, many biomedical materials have been provided and manufactured based on the growth rays for health care as well as complimentary and alternative therapies. In this study, we probed the effect of FIR hot compress on antioxidation ability in human by determining the concentration of superoxide anions in blood. The results revealed that the level of superoxide anions in sympathetic, parasympathetic, and sympathetic plus parasympathetic group was decreased, rather than control group. This suggested that FIR exposure can significantly eliminate superoxide anions and provide protective effect against oxidative damage in human.
A Model for Drilled Cooling in the Valve Bridge of Cylinder Head
Authors: Liu Xiao , Zhang Wei Zheng , Xiang Chang Hu
Published: March 2011

To evaluate the efficiency of drilled cooling in the valve bridge of cylinder head, theoretical analysis for the drilled cooling is carried out, and a mathematical model for the enhanced cooling is presented based on a simplified 3D model. The mathematical model is validated by numerical study on the heat transfer with and without drilled cooling, which is carried out through fluid-solid coupling. The correlation between the velocity in the drilled passage and heat transfer coefficient was also analyzed. The results can be used to solve the heat transfer in enhanced diesel engine.
Hybridization of ODNs with the Core-Shell Structure of Fe3O4 Nanoparticles and CS/ALG Composite Structure
Authors: Chang Ho , Wu Yan Chyuan , Chen Chih Hao , Chung Ren Jei , Cho Kung Ching , Lin Wei Lin
Published: March 2011

This study develops a nanocomposite structure with magnetism and biocompatibility. Composite structures with magnetism can be applied for biomarkers, specific tissue cell detection and targeted drug therapy. This study adopts a chemical disposition method to prepare Fe3O4 magnetic nanoparticles with the average size of 20-25nm. The complex biocompatible chitosan-alginate membrane covers Fe3O4 magnetic nanoparticles and the thickness of the complex membrane is controlled at 50-80nm. The efficiency of the oligonucleotide (ODN) combination is increased through the high biocompatibility of this composite film. Two groups of different sequences of ODNs and a bridge ODN undergo hybridization. The results show that the intensity at which the Fe3O4 is covered by chitosan-alginate composite film conjugated with ODNs is 2300nN. Furthermore, Fe3O4 covered by complex membrane of chitosan-alginate hybridized with 30 μM ODNs to yield the optimum hybridization intensity of 4528 nN, and the average hybridization intensity of ODNs with different concentration is 3971 nN.
Investigation on the Electronic Components High Temperature Alarm in High Computer Density Internet Data Centers
Authors: Wang Zhi Wei , Chen Long , Jing Xiang , Han Li Ping
Published: March 2011

This paper analyzes the phenomenal essence of the electronic components high temperature alarm in high computer density internet data center and the effect of controllable variables of microthermal environment around the computer racks, presents the risk index of electronic components high temperature alarm, i.e., unmatch ratio; carries out the onsite investigation on the situation of air distribution of two internet data centers in Xi’an city, and evaluates the probability of emerging the high temperature alarm, finally puts forward the suggestions of improving air distribution pattern.
A New Approach to Modeling Static Hysteresis of Piezostack Actuator
Authors: Nguyen Phuong Bac , Nguyen Quoc Hung , Choi Seung Bok
Published: March 2011

This paper proposes a new recursive based polynomial approach for modeling a hysteresis of a piezostack actuator. The formulation is based on two main curves of hysteresis that are identified experimentally. In the proposed model, an adjusting function that relates the outer curve and its next minor is given. Its coefficients are obtained from the boundary conditions and experiment. From this adjusting function, a recursive-based polynomial formula for the cases of monotonic increasing and decreasing of input excitation are developed to predict the hysteresis. To evaluate the accuracy of the proposed new model, experiments with two different waveforms are carried out.
Optimal Design of an Hybrid Magnetorheological Brake for Middle-Sized Motorcycles
Authors: Nguyen Quoc Hung , Jeon Jun Cheol , Choi Seung Bok
Published: March 2011

This research focuses on developing a new configuration and optimal design of magneto-rheological (MR) brake for a middle-sized motorcycle which can replace conventional drum-type brake. The proposed MR brake mechanism utilizes a hybrid concept of magnetic circuit (using both axial and radial magnetic flux) to generate braking force. In the optimization, the required braking torque, the temperature due to zero field friction of MR fluid, the mass of the brake system and all significant geometric dimensions are considered. After a brief introduction of the proposed MR brake configuration, the braking torque is derived based on Herschel-Bulkley rheological model of the MR fluid. The optimal design of the MR brake is then analyzed. An optimization procedure based on the finite element analysis (FEA) integrated with an optimization tool is used to obtain optimal geometric dimensions of the MR brake. From the results, discussions on the performance improvement of the optimized MR brake are described.
Fire Spalling Modeling of High Performance Concrete
Authors: Zhao Jie , Zheng Jian Jun , Peng Gai Fei
Published: March 2011

Under high temperature conditions, such as fire, high performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental damage to concrete structures. To prevent concrete from spalling, the mechanism should be understood. In this paper, an anisotropic damage model, in which both the thermal stress and vapor pressure are incorporated, is presented to analyze the spalling mechanism. The spalling phenomenon is studied based on two cases of different moisture contents. It is concluded that when the vapor pressure is present, concrete will behave much more brittlely.
Behavior of the Overtaking Problem for Isentropic Gas Dynamics Equations with Polytropic Gas in Exponent γ=3
Authors: Pan Tao
Published: March 2011

The entropy weak solution of the isentropic gas dynamics system has the important background of physics and mechanics, and the study on the interaction of nonlinear elementary wave not only had direct mechanics significance, but also was an effective method to clarify the structure of the weak solution. We explored the overtaking problem of the centred rarefaction wave and the shock wave for isentropic gas dynamics system with polytropic gas in γ=3. By using Riemann invariants, the characteristic method and convexity analysis for the envelope of compression waves, we clarified the physical state after interaction for the overtaking problem in the interaction location, and proved that the locally structure of the entropy weak solution was piecewise smooth.
Research on the Posture Kinematics Model of Multi-Joint Caterpillar Robot and its Motion Control
Authors: Li Xiao Peng , Ma Hong Wei , Li Wei Jian , Wang Chuan Wei
Published: March 2011

It is higher superior of the caterpillar mobile robots to others types of robots in unknown complex environment, the advantage is apparently; but the issue is, it is difficulty in exact analyzing the posture of the robot kinematics model. In this paper, the new ideas proposed in the view of this issue, on the solution of posture motion model in the non-structural environment, motion agencies is transformed by the equivalent mechanism transformation, a fixed posture on the ground movement model is established by the screw theory. The posture model of non-holonomic constraints multi-joint caterpillar robot could be transferred into a kinematics model of parallel mechanism posture. Besides, the posture control method on over-obstacle stability is proposed, analyzing with the controlling experiment.
Test and Analysis of Bush Roller Chains for Noise Reduction
Authors: Liu Xiao Lun , Sun Wei , Ding Song , Liu Jian Fang , Wang Yu Ying , Jiang Bin
Published: March 2011

A low noise duplex bush chains with split rollers was developed through changing roller structure to reduce noise of bush roller chains. The split rollers could absorb more impact energy, mitigate meshing impact and reduce chain drive noise. The noise generated by different types of duplex bush roller chains was carried out to test in same speed, low noise characteristics of duplex sleeve chains with split rollers was verified. By analysis of testing data, noise level of duplex sleeve chains with split rollers compared with that of the other duplex bush roller chains was reduced by the average 3 ~ 8dB, and low 10 ~ 13dB than that of 16A simplex sleeve roller chains. The chains made chain drive significantly improve in the working environment, with steady transmission, strong bearing, low noise, and a significant noise reduction was achieved.
Study of Thermal Cycle and Cooling Rate of Steel 30XГCA Single-Pass Weld Joints
Authors: Chinakhov D.A.
Published: March 2011

The given article studies the changes in thermal cycle and cooling rates of steel 30ХГСА weld joints at various distances from the weld center using modern thermal imaging equipment. The analysis of the experimentally obtained and calculated thermal cycles showed that the calculated cycles almost match the experimental ones in terms of quality but the time distribution of calculated values is 4-5 times smaller than that of the experimental ones. On the base of experimental results and theoretical investigation of the thermal cycles for fusion-welding in СО2 we have developed an improved formula for calculating heat conduction for machine single-pass welding. The difference between the calculated and experimental values of thermal fields does not exceed 10%.
Water Hydraulic Synchronous System Position Control of Modeling and Simulation
Authors: Yuan Rui Bo , He Min , Zhang Zong Cheng
Published: March 2011

Introduction of a water synchronous hydraulic system , the special physical and chemical properties for water and the position requirements in Synchronous control , mathematical models is based on the system and simulate the position control performance of the system . there is a reference value of water hydraulic field application of synchronous controlling.
Study of Fault Classification Based on PSO Wavelet Neural Network
Authors: Pan Hong Xia , Huang Jin Ying
Published: March 2011

In this paper, a novel studying-training algorithm of wavelet neural-network based on particle swarm optimization (PSO) was presented. Then it was compared with the traditional gradient descent algorithm by the fault classification experiment. The simulation result get a conclusion that the wavelet neural-network trained by PSO not only reduces the iterations, but also get the better convergence precision. It is further indicated that PSO algorithm is fit to train the wavelet neural-network and the optimized network has good signal classification ability.
Modeling and Simulation of Airport Runway Frictional Coefficient Measuring Vehicle Based on Bond-Graph Method
Authors: Shi Xu Dong , Shi Shou Wen , Zhang Lu , Li Jian Li
Published: March 2011

An airport runway frictional coefficient measuring vehicle is the important ground support equipment which is essential to the aircraft safety of taking off and landing. The modeling method of the measuring vehicle affects the measure result directly. The bond-graph modeling method is used to model the hanging system and measuring system of the measuring vehicle, the surface roughness of the runway produced by power spectral density and the discrete Fourier inverse transformation is utilized as the input excitation. The validity of the system models is verified based on the simulation.
Parameter Identification for Nonlinear Dry-Friction Structure of Metallic Rubber
Authors: Li Yu Yan , Huang Xie Qing , Song Kai
Published: March 2011

In order to reduce workload of parameter identification for nonlinear mechanical model of metallic rubber, in this paper, based on parameters identification method of static experimental curves, experiments were designed, and data were processed, further aimed at hollow cylindrical metallic rubber, nonlinear dry-friction structural element model’ parameters were identified, what’s more, friction coefficient, radial stiffness, axial stiffness, and friction angle of stainless wire under room temperature were obtained. It was proved by simulation that parameters identification method in this paper was effective and accurate. Based on this, errors of simulation were analyzed elaborately.
Computational Study of Streamfunction-Vorticity Formulation of Incompressible Flow and Heat Transfer Problems
Authors: Borah Arup Kumar
Published: March 2011

In this paper we have studied the streamfunction-vorticity formulation can be advantageously used to analyse steady as well as unsteady incompressible flow and heat transfer problems, since it allows the elimination of pressure from the governing equations and automatically satisfies the continuity constraint. On the other hand, the specification of boundary conditions for the streamfunction-vorticity is not easy and a poor evaluation of these conditions may lead to serious difficulties in obtaining a converged solution. The main issue addressed in this paper is the specification in the boundary conditions in the context of finite element of discretization, but approach utilized can be easily extended to finite volume computations.
Research on Pile-Soil Stress Ratio of DJM Pile Composite Foundation
Authors: Yan Qing Zhi , Wang Yan Hua
Published: March 2011

Pile-soil stress ratio is defined as the average stress ratio of the head of pile to the soil around of piles, which is a very important indicator to reflect the level of the together-work of pile and the soil, also a major parameter of calculation of capacity of composite foundation and settlement. How to choose pile-soil stress ratio is still a problem unsolved. Bearing performance of the DJM pile composite foundation is studied by way of field static load tests and pile-soil stress ratio tests. This paper is to analyze the bearing performance of the DJM pile composite foundation in the Yellow River Delta region with the plane strain finite element method and gain the load-sharing ability of soil and regulations of pile-soil stress ratio with the changes of effecting factors.
Optimization of Parameters Estimation for Normal Distribution Based on Bootstrap Method
Authors: Xin Shi Bo
Published: March 2011

According to sample mean submits normal distribution which is extracted from normal distribution, we give the equation of parameters estimation for normal distribution by bootstrap method, then we make a simulation analysis and compare the effect of parameters estimation which uses traditional maximum likelihood method and bootstrap method.
Static Load Capacity of Three-Row Roller Slewing Bearing Considering Clearances
Authors: Li Yun Feng
Published: March 2011

A calculation method of static load capacity for three-row roller slewing bearing considering clearances was proposed. The statics models of the slewing bearing in the radial direction and the axial direction were established respectively. By solving the equilibrium equations of the models, the rolling element loads were calculated. Based on the load distribution of the rollers, the static load capacity of the bearing was calculated and the influences of the clearances on it were researched. Results show that slight negative axial clearance is favorable for the static load capacity of the bearing.
Influence of Outer Rubber Bushing Stiffness of the under Control Arm on Multi-Link Independent Suspension Performance
Authors: Liu Xin Tian , Zhao Li Hui , Huang Hu , Wang Yan Song , Chen Hao
Published: March 2011

Multi-link independent suspension is built according to the hard point parameters of a car. According to the multi-body dynamics and Suspension Kinematics theory, with the working condition of wheel travel and braking, the suspension performance is analyzed and discussed by changing rubber bushing stiffness of under control arm. The conclusion is drawn that axial stiffness of rubber bushing has almost no effect on the suspension performance, but radical stiffness has a little effect and torsion stiffness has the biggest effect on the suspension performance of these three parameters.
Research and Design of Mechanical System Virtual Prototyping
Authors: Ma Chang Qing , Liu Xian Xi , Dai Bao Qing
Published: March 2011

The effectiveness and actualities of mechanical system virtual prototyping software were summarized. The process from prototype to utility, commercialization and industrialization were analyzed in software engineering. The basic concept of practical improvement for a mechanical system virtual prototyping software was presented. The key points of the mathematical model, topology structure, constraint type, kinematic and dynamic simulation and data exchange were discussed by the theory of multibody system dynamics and the technique of object-oriented.
Preparation of Zirconia Nanoparticles in Ionic Liquid –Water and Characterization
Authors: Ma Xiang Dong , Liu Fei Lei , Zhang Hui , Xu Liu Jie , Wei Shi Zhong , Li Ji Wen , Zhang Guo Shang
Published: March 2011

Zirconia nanoparticles were prepared in ionic liquid BMIMBF4-water using zirconium salt (ZrOCl2•8H2O), urea as raw material by hydrothermal synthesis method. The structure and morphology of zirconia were characterized by XRD and TEM. The experimental results showed zirconia nanoparticles could be prepared at 170°C for 24 hours in a hydrothermal kettle. Its size was about 10-30nm and the particles dispersed uniformly, and had no agglomeration phenomenon.
Research on Multi-Motor Synchronization Control Based on the Ring Coupling Strategy for Cutterhead Driving System of Shield Machines
Authors: Liu Ran , Sun Jian Zhong , Luo Ya Qin , Sun Wei , Li Wei Dong
Published: March 2011

With the research object of cutterhead rotation electric drive system, influencing factors of the system synchronous coordination and the multi-motor torque synchronization control strategy is studied. The paper analyzes the dynamics of the cutterhead rotary motors-driving system, discusses the interaction mechanism between motors and gear nonlinear transmission unit, and then the mathematical model of the cutterhead rotary driving system with consideration of gear frequency cycle error and backlash is presented. Based on that, the multi-drive synchronization control based on the ring coupling strategy is given. Simulation results using Matlab platform show the effectiveness of the proposed strategy.
Evaluating the Impact of Coarse Aggregate Content on Properties of Cement Treated Base
Authors: Hu Li Qun , Sha Ai Min
Published: March 2011

This paper mainly presents the study on the properties of cement treated aggregate with different coarse aggregate content. The test specimens which contain 75%, 70%, 65%, 60% and 55% of coarse aggregates were made and the 7d, 28d, and 90d unconfined compressive strengths (UCS), 28d thremal shrinkage coefficient, as well as 90d anti-erosion performance were tested. Results show that with the increase of coarse aggregate, the maximum dry density (MDD)of the cement treated aggregate mixture increased slowly at first to reached the peak value and then decreased rapidly; The optimum moisture content (OMC) declined with the increase of coarse aggregate content; In order to enhance the UCS of cement treated aggregate, coarse aggregate of mixture can be increased to some extent, but too much coarse aggregate will increase the void of the specimen and lead to lower UCS; Increasing the content of coarse aggregate is able to decrease the thermal shrinkage coefficient and erosion quantity of 30 min of the specimens. This is favourable to enhance the cracking resistance and anti-erosion performance of cement treated aggregate base course.
Microstructure and Properties of In Situ Al-Si-Mg2Si Composite Prepared by Melt Superheating
Authors: Liu Zheng , Xie Min , Liu Xiao Mei
Published: March 2011

Mg2Si particle reinforced in-situ Al-Si composite is prepared by melt superheating, and the microstructure and properties of the composite are researched. The results indicate that it is feasible that the melt superheating is applied to preparing Mg2Si particle reinforced in-situ Al-Si composite, and the suitable preparing parameters of melt superheating on the alloy are obtained. When the superheating temperature is 860°C and holding time is 25 min, the average size of Mg2Si particle in the alloy will be reduced to 11μm compared with 34μm without melt superheating, and the mechanical properties of the composite is obviously improved.
The Researches on the Green Construction Model of the Steel Building System of Residence Project
Authors: Chen Wei , Duan Li Jie , Cai Yu Chun
Published: March 2011

The steel building system of residence project has more advantage in environment protection and project management than the traditional residence project construction. The main steel structure residence components can be manufactured in the green construction base as the manufacturing industry. The key issue to realize the green construction model of steel building system of residence project is to apply with a suitable model of green construction base. This paper introduced four types of green construction base which are different levels related with project, enterprise, industry and region to combine construction industry with manufacturing. The TOPSIS method was applied to evaluate and analyze to figure out the optimization model of green construction base in steel building system of residence project.
Study on Classification of Rock Pile
Authors: Huang Ming Kui
Published: March 2011

Rock pile is a typical kind of adverse engineering geologic phenomenon in mountainous engineering construction. In this paper, according to the main factors influencing the engineering properties of rock pile, the classification of the rock pile are studied. Based on the physico- mechanical properties of rock pile, the multi-hierarchy classification method is proposed. The suitability of the process is verified by classifying the typical rock pile on the Shui-ma(from Shuifu to Maliu Bay) expressway. The relevant results can provide reference to other classification study of rock pile.
Oscillation Analysis in a System of Coupled Oscillators with Delays
Authors: Feng Chun Hua , Pettis Carl S.
Published: March 2011

In this paper, a system of coupled oscillators with delays is investigated. Some sufficient conditions to guarantee the existence of oscillations for the model are obtained. Examples are provided to demonstrate the proposed results.
Study on Efficiency Character of Axial Internal Combustion Fluid Pump
Authors: Huo Wei , Zhang Tie Zhu , Zhang Hong Xin , Xing Bo Bo
Published: March 2011

Integrating traditional engine and plunger pump, a new type power equipment─Internal Combustion Fluid Pump(ICFP) was developed, through which thermal energy can be turned into hydraulic pressure directly. As a main factor affecting ICFP’s performances, efficiency is the basis to design its structure. For three-cylinder axial ICFP, it’s dynamics model was setup, and its efficiency character was studied. The simulating results show that ICFP’s effective thermal efficiency is 37.44% at calibration condition, which is higher than engine-pump system by 23.06%. For the three-cylinder ICFP, the effective thermal efficiency experiments are done. Errors are within 5%, and it proved that the simulation results are correct.
Stability Research of Laser Confocal Probe for Measuring the Micro-Shpere
Authors: Wang Ting , Zhu Yu , Yang Kai Ming
Published: March 2011

Laser confocal probe, on an active focus adjusting principle, was introduced in this paper. This kind of non-contact laser probe has the abilities to do the detection on strong reflection of the surface of high precision metal parts and optical devices. So, a problem of shape inspection detection was resolved. The micro-sphere is the key element in the ICF (short for inertial confinement fusion) system. The success or failure of "Ignition" is directly related to the accuracy of the assembly location of micro-sphere in the micro-target. Because of the particularity of the micro-sphere, laser confocal probe is used to do the detection of the center error of micro-sphere. The required measurement precision is less than 3µm. The mathematical formula between the height defference or the displacement value of measured surface and the displacement valued of the tuning fork can be gotten by the time different principle. Good stability of frequency and the swing of tuning fork, which approved through the experiments, have little influence to the time different Δt and the final measurement results.
Thermal and Stability Analysis of Formed Platelet in Platelet Transpiration Cooling
Authors: Hou Yong Fa , Liu Wei Qiang
Published: March 2011

Platelet transpiration cooling is one of the key techniques for the developing reusable launch vehicle. The thinner of the platelet, the better effect plate transpiration will gain. Meanwhile, the platelet unit may get wrinkled if thermal stress is large enough. One-dimensional non-equilibrium model is adopted to analyze the heat transfer characteristics of platelet transpiration cooling. The assumption of rectangular plate with three-side simple supported and one-side free is taken and Galerkin method is applied for analyzing the stability of platelet unit. Analysis indicates that as the heat transfer intensity increases, the thermal soaking depth decreases, while more coolant is needed to keep the heated wall at design temperature. Also, the critical thickness for the platelet not to get wrinkled gets larger with the increasing thermal soaking depth.
Sizing Detection of a Surface-Breaking Crack by Ultrasonic Technique
Authors: Her Shiuh Chuan , Lin Sheng Tung
Published: March 2011

Ultrasonic is one of the most common uses of non-destructive evaluation technique. It could detect flaws inside the structure and on the surface such as voids, holes and cracks. In this investigation, a 304 steel block with a surface-breaking crack was fabricated. A series of test specimen with different depths of surface-breaking crack ranging from 2mm to 9mm was fabricated. The depth of the surface crack was evaluated by the pulse-echo ultrasonic technique. In this work, 2.25MHz, 5MHz and 10MHz of incident waves were employed to detect the depth of the surface-breaking crack. The effect of incident angle on the measuring accuracy was investigated. Experimental results showed that the accuracy of crack sizing detection by ultrasonic technique is not only dependent on the frequency of the incident wave but also dependent on the incident angle.
Stress Analysis of Proton Exchange Membrane Fuel Cell
Authors: Miftah Kurniawan , Wan Daud Wan Ramli , Majlan Edy Herianto
Published: March 2011

The assembly of proton exchange membrane fuel cell (PEMFC) is the important factor for the performance. The achievement of proper design will improve the pressure distribution and the electrical contact resistance between fuel cell parts. The assembly pressure affects the contact behavior between of bipolar plate and gas diffusion layer (GDL). In this study, finite element analysis (FEA) was used to analyze the behavior of single cell fuel cell under the variation of assembly pressure. It shows 3D of deformation, and the compression pressure every part of the fuel cell components. The simulation varied the torque assembly from 1 Nm to 3 Nm with increment 0.5 Nm. The simulation using FEA shows that high assembly pressure also affects to the high deformation and stress in the components of fuel cell. This phenomenon affects to the performance of PEM fuel cell.
Parameterize the Center of the Trust Region for Solving Quadratic Interpolation Models
Authors: Zhou Qing Hua , Geng Yan , Zhang Ya Rui , Xu Feng Xia
Published: March 2011

The derivative free trust region algorithm was considered for solving the unconstrained optimization problems. This paper introduces a novel methodology that modified the center of the trust region in order to improve the search region. The main idea is parameterizing the center of the trust region based on the ideas of multi-directional search and simplex search algorithms. The scope of the new region was so expanded by introducing a parameter as to we can find a better descent directions. Experimental results reveal that the new method is more effective than the classic trust region method on the testing problems.
A Note on Wedge Trust Region Radius Update
Authors: Zhou Qing Hua , Xu Feng Xia , Geng Yan , Zhang Ya Rui
Published: March 2011

Wedge trust region method based on traditional trust region is designed for derivative free optimization problems. This method adds a constraint to the trust region problem, which is called “wedge method”. The problem is that the updating strategy of wedge trust region radius is somewhat simple. In this paper, we develop and combine a new radius updating rule with this method. For most test problems, the number of function evaluations is reduced significantly. The experiments demonstrate the effectiveness of the improvement through our algorithm.
Optimal Mechanism Design of a Shearing Machine Using an Ant Colony Optimization Algorithm
Authors: Huo Jun Zhou , Chen Jing , Li Zhen
Published: March 2011

The shearing machine is an important and complex accessory equipment of the continue-mode rolling mills. Its mechanism design scheme determines the shearing quality of steel. The shearing machine mechanism design (SMMD) contains multi conflicting technical requirements and belongs to a multi objective optimization problem with the nonlinear constraints. Recently, ant colony optimization (ACO), a swarm based computing methods, has demonstrated its superiority in many complex optimization problems. This paper presented a quasi TSP-based SMMD model and an ACO algorithm for the SMMDP. The presented method dispersed the searching space of the design variables by setting several different search steps, and an ACO algorithm was adopted to search the best searching step of each design variable dynamically during the whole optimization process. Computational results showed that the proposed method can improve the computational accuracy and produce better solutions within short running times.
Study on Characteristics of Quercus aliena var. acuteserrata Community in Mt. Qinling
Authors: Zhao Yong Hua
Published: March 2011

In Quercus aliena var. Acuteserrata community, phanerophytes (Ph) accounting for 58.7% was main Life form. Hemicryptophytes (H) with 28.1% was the second in Qinling Mountains. Mesophyll which accounted for 61.64% was major leaf physiognomy, and microphyll the second accounting for 27.40%. Simple leaf taking 84.93% was primary leaf-form. Herbaceous leaf accounted for 80.82% and was a major type of leaf property. The temperate elements, which were 43.17% of the genera, were in dominant position and were consisted of 98 genera; the tropical areal types including 58 genera accounted for 25.55%. These showed that Quercus aliena var. Acuteserrata community has the transitional character, that is, it is in the ecotone.
The Design and Implementation of Agricultural Production Data Warehouse
Authors: Zhou Li Juan , He Xiao Xu , Li Kang
Published: March 2011

This paper designed a data warehouse model of agricultural production. And it built an effective and viable agricultural production data warehouse, by using some key technologies: multidimensional data analysis, cube, materialized view selection, materialized view maintenance. Finally, it provided a solution for the effective management and maintenance problems about high-capacity heterogeneous data.
Stamping and Springback of PEMFC Metal Bipolar Plate
Authors: Chen T. , Gu Y.F. , Li C.P. , Qiao Y.Q.
Published: March 2011

Recently, the key obstacle of proton exchange membrane fuel cell (PEMFC) development is the higher manufacturing cost. In a PEMFC stack, bipolar plate is a main and multifunctional component, which accounts for the 60%-80% of total weight and 30%-45% of stack cost. So the forming cost of bipolar plate will influence the entire PEMFC manufacturing costs. Metal bipolar plate, which can satisfy the requirement, can be used for mass production to reduce the cost. Finite element analysis (FEA) of stamping and springback for metal bipolar plate is studied by ANSYS/LS-DYNA to be feasible.
Research on Improved Control Method of Electromagnetic Clutch in the Tufted Carpet Jacquard System
Authors: Qiao H.Y. , Sun Yi Ze , Xu Yang , Sun Zhi Jun
Published: March 2011

Focusing on the high poitr consumption and slow dynamic response of the electromagnetic clutch in the tufted carpet jacquard system, this paper proposes an improved control method. Firstly, the numerical relationship betiten electromagnetic force, gap size and current are analyzed through the finite element method, and the relationship surface is described. Then the math model of the electromagnetic clutch is constructed and the circuit current variation is solved. At last, the improved control method with PWM is verified by experiment. The results show that the method is effective and reliable.
Study on the Leisure Chair Design of Elderly People
Authors: Guan S.
Published: March 2011

Through the survey of the use of leisure chair in elderly people’s leisure life, we grasp the needs features of elderly people for leisure chair and the product features at present, and propose some unreasonable factors of leisure chair; On the basis of survey, we analyze the characteristics of elderly people’s leisure behavior, and discuss the design trend of elderly people’s leisure chair in future, from the perspective of physiological characteristics of elderly people and the use of Human Engineering in chair design, etc. The research may provide some suggestions and references for the development of elderly people’s leisure products.
Working Space Solution and Scale Fitting of a 5-Strut Parallel Machine with Swivel Joints
Authors: Xie H. , Zhang K.M. , Li Q.
Published: March 2011

Taking a 5-axis-5-swivel parallel machine tool with swivel joints as an example, a geometric method is put forward in the paper to solve this kind of parallel machine working space. In this method, the border of the working space is found when several curves cap. This geometric mathematical model reveals the relationship betiten the structure parameters and the working space. The maximum proportion of the volume of working space is used as a target of evaluation ,and how scale parameters affect this target is also discussed. With this method, the condition of constraints could be got from the machine principles and the working space is also directly calculated. Hence, no more complex derivation process is needed.
Parameterization Design and Virtual Assembly of a Jet Pump
Authors: Wang Chao , Zhang J. , Liu J.J.
Published: March 2011

The jet pump is widely applied to industry fields. The nozzle, throat tube, and diffusion tube of the jet pump is variable to meet different working conditions. Parameterization design of a jet pump can be used to design the throat tube and diffusion tube via a given nozzle diameter and sectional area ratio. The virtual assembly of the jet pump, which consists of upper body, pump core, under body, and pump shell, is used to verify the fitting allowance of parts. The result provides an anticipated inspection for manufacture and improves the design efficiency.
Study of Product Innovative Design Methods Based on Idea Emergence Mechanism
Authors: Zhao Feng , Yang Hao Zhong , Liu Xiao Xia
Published: March 2011

From the essential characteristics of user needs and user knowledge’s inspiration and guidance to product innovation and in accordance to the thinking features of human experts on the concept innovation stage, this paper raises and constructs a innovative thinking generator which is based on Internet and orients to product concept innovation. An analogue of innovative thinking emerging process on the stage of product concept innovation is achieved. This establishes the foundation for the realization of computer-aided thinking on the product concept innovation stage, and provides referential thoughts and methods for product innovation.
Dynamic Characteristic Difference on Two Kinds of Broading Machine on the Similar Configuration
Authors: Li Zhi Xin , Ji Shi Ming , Yuan Qiao Ling , Zhang Li , Jin Ming Sheng
Published: March 2011

This paper focuses on the dynamics characteristic difference on the two kinds of broading machine, the workpiece moving and the cutting-tool moving. There is 0.002mm thickness of oil-film clearance between the mobile and immobile components of the broading machine. Hydraulic pressure derived from the driving oil cylinder drives the workpiece or cutting-tool moving, while the material on the workpiece is cutting. Cutting-tool of the machine is an external expand cutter with the groove for breaking the cutting waste, the manufacturing phase is a pulse impact cutting exciting applying on the broading machine correspondingly. On manufacturing, natural characteristic of the broading machine is approximately the pulse impulsion frequency of the machine;response amplitude of the lather is increasing manifesting. The study is focused on the dynamics characteristic of two kinds of broading machine, the difference is workpiece or cutter moving, to predict the manufacturing performance.
Numerical Simulation of a Novel Bipolar Plate Flow Field of Proton Exchange Membrane Fuel Cell
Authors: Lu Chong Da , Gao Peng Fei , Wang Wei Fang , Wen Dong Hui
Published: March 2011

This paper proposes a novel bipolar plate flow field of PEMFC with the intersectant microstructure. Numerical simulation about both the flow velocity distribution and the pressure distribution for the reactive gas were accomplished according to the model building by Pro/E, grid meshing and boundary condition specifying by Fluent. Compared to traditional serpentine flow fields, the gas pressure difference between the inlet and the outlet of this novel flow field is appropriate to promptly discharge the water produced during the operation of the PEMFC, and the flow velocity of the reactive gas among all the flow field is well-distributed, which assures reactions occurring uniformly in the flow field under the bipolar plate. All the properties of this novel flow field make a great sense to improve the integrated performance of the PEMFC.
Numerical and Flow Field Simulation of Acoustic Levitation Polishing
Authors: Wang Wei Fang , Zhang J. , Wen Dong Hui
Published: March 2011

Based on a novel polishing method named as acoustic levitation polishing. Analysis of the basic principles of acoustic levitation polishing. Through the simulation of fluid field in polishing, by the case that in a single or multiple sound source vibration, contrast the flow field of slurry. Analysis of the effect of the movement of slurry in the container to the surface uniformity.
Product Design of Master Part Based on PRO / E
Authors: Feng Fang , Hu Guo Jun , Pan Hui
Published: March 2011

In this paper, using PRO / E Master Part to top-down design of parts and products. Adoption of this approach can be consistent with the requirements of customers timely, so it can improve the design efficiency and working methods.
Development and Research of LED Outdoor Lighting Based on Leisure Park Environment
Authors: Liu Y.T. , Lu C.F.
Published: March 2011

LED is getting more and more attention in the application of LED outdoor lighting design, this articles focus on the irrationality of structure and sculpture design about LED outdoor lighting, design a plan of LED lawn lamp based on the leisure park environment through deeply analyzing the design standard of outdoor lighting, application environment and customer psychology demand, to provide reference for better promoting and usage in LED outdoor lighting.