bluuebunny/crossref_metadata_2025 huggingface dataset:
Methods of Shoes Style Creation Design
Authors: Peng Wen Li , Jin Hai Ming , Dong Xiao Wei
Published: January 2012

As the economics developing, the traditional design can not meet the changeable customers demand. So the research on methods of new products design becomes valuable. In this paper, the methods of shoes style creation design were discussed. On the base of knowledge, several kinds of methods were put forward to realize shoes style creation design, including exciting creation-intelligence encouragement, expanding creation thought and way, analyzing style, reverse design, series design by analogy and judgment and part modification, reference and association. And a standard for shoes style creation design was also raised. The research mentioned above offers a new thought of shoes style creation design.
A Numerical Simulation of Surface Deformation due to Ore Drawing Perturbation
Authors: Li Hong Shuang , Du Jian Hua , Du Cui Feng
Published: January 2012

Based on the feasibility of ore drawing simulation with PFC, a PFC numerical simulation was performed on the surface deformation problem in Jinshandian mine. With PFC numerical simulation software, ore drawing simulations were carried out under four covering layer thicknesses of 15 meters, 20 meters, 25 meters and 30 meters. By comparing the deformations of surface loess layer according to the simulation results of four groups, related equation was obtained.
Quantitative Study on the Relation between Water Disaster and Grain Production of Hubei Province
Authors: Li Tao , Wang Xue Lei , Wen Wei , Li En Hua
Published: January 2012

The grain fluctuation situation of Hubei was analyzed by calculating the grain fluctuation coefficient from 1990s. And the quantitative correlation between grain production and the water disaster was studied by grey correlation analysis. The results were shown as follows. The main water disaster factors impacting grain production were effective irrigated area and planting structure, the relationship degree of which with grain yield is respectively 0.91 and 0.85 ranking the first two among all the selected factors. It was shown that water disaster influenced the grain yield heavily
Tuning Algorithm for Modeling and Controllability of Fractional-Order Control Systems
Authors: Yan Zhe , Che Shu Tao , Cui Xiao Ming , Zhang Zhi Qiang , Zhang Chao
Published: January 2012

A new analytical method on the controllability and modeling of systems is presented in this paper. For a given classical Transfer function in the complex frequency domain, we can transform it into fractional-order domain by using Laplace or Z transform and inverse transform, Trapezoidal Rule are applied. State space based on the complexity of the order, Caputo fractional derivative defined as state variables, it will be the state equation of the system. Simulation results show the feasibility of modeling
Application of Organic Inclusion in Hydrocarbon Exploration
Authors: Liu Hui Qing , Zhong Yu Yuan
Published: January 2012

Inclusion as a research method was mainly applied in the study of mineral deposit geology in the beginning. In recent years, organic inclusion research has become one of the important means in hydrocarbon exploration. The study of the inclusion can determine the role of diagenesis and reservoir of time and temperature, infer hydrocarbon migration, tectonic movement and paleo-heat flow history, in order to better guide hydrocarbon exploration. This paper mainly discussed research method of hydrocarbon inclusions type and oil and gas inclusion, and summarizes the inclusion of the fracture structure used to study and hydrocarbon accumulation relations, determines the gas accumulation time, evaluate hydrocarbon, calculate fluid potential, predict oil and gas accumulation zones, and other aspects of the role. Inclusions found early, at first is mainly applied in the study of mineral deposit geology. Since Marray (1957) discovered larger hydrocarbon inclusions in quartz especially[1], in the 70 s, with the development of oil geochemical, the minerals fluid inclusions in the oil field geological research has been widely used. G. m. Gigashvili and v. p. Kalish in 1977 are the first to report the use of mineral inclusions as the hydrocarbons containing hydrocarbon migration of physical and chemical condition of fluid of the index. At the beginning of the 80's, the technology has already been foreign research institutions and oil company are widely used in reservoir the diagenesis of research and oil and gas exploration [2,3,4]. China has begun to set up in the 1960 s, the early main inclusions laboratory to research various metal hydrothermal ore deposits in the ore-forming temperature and the composition of the ore-forming fluid. ShiJiXi (1985,1987) will fluid inclusions method is used to study the carbonate formation of China and the thermal evolution degree, division of hydrocarbon generation evolutionary stages, according to package the body type, distribution, homogenization temperature, salinity, gas organic composition various inclusions observation and analysis data put forward the carbonate hydrocarbon source rocks and oil and gas reservoir has performance evaluation method and hydrocarbon index[2,5,6]. In petroleum exploration, through[[ First Author: Huiqing Liu (1980－), male, doctoral students, Major: mineralogy petrology mineralogy,E-mail:liu8935959@163.com]] the study of the sandstone reservoir formation of diagenetic minerals fluid inclusions, and combining with the chip observation to judge whether have oil and gas migration to reservoir, and oil and gas accumulation of time, ancient geothermal, formation water such as the salinity has a very important significance
Research on the Performance of the Autoclaved Fly Ash Common Brick
Authors: Pan Lin , Han Chun
Published: January 2012

Based on the experimental study foundation of setting altogether 10 bearing axially loaded long column of the autoclaved fly ash solid bricks. We had a comparative analysis on the fly-ash common brick with existing norms. At last, we get that ultimate bearing experimental value of autoclaved fly ash-lime brick masonry is higher than Theoretical ultimate bearing through research and analysis. It was said that it is reliable to calculate the load-bearing capacity of autoclaved fly ash-lime brick and column by design standard formula of masonry.
A Measurement and Analysis Technique of Curves of Metal Parts
Authors: Shao Wei , Hua Deng Xin
Published: January 2012

Metal parts with large and complicated curved surfaces used widely have some characteristics such as a great volume, a big area, distorting easily. It is very difficult to measure and evaluate accurately the parts. Taking measurement of the parts as a purpose, a new measurement method called On-Line Shape Measurement System (OSMS) is put forward.Error analysis of curves is a requirement to assure quality and to reduce manufacturing costs and rework. This paper proposes a new approach and algorithms for the error analysis of curves.the system applies a robust mathematic model, Implicit polynomials (IP), to construct the model of the test-points. Once the CAD model is adjusted, it is compared with input to reveal the errors between their shapes. To accomplish this task a new shape matching algorithm is developed. Experimental results on error analysis of a variety of the machined metal skin of aircraft are reported to show the validity of the proposed methodology.
Three Layers Optimization Model for Time-of-Use and Interruptible Price Based on Fuel Saving and Emission Reducing
Authors: Zhao Yin Hui , Tan Zhong Fu , Song Yi Hang
Published: January 2012

Based on fuel saving and emission reducing, this study establishes three layers optimization model for time-of-use and interruptible price. At first, a model to minimize total cost, including power purchase cost, emission cost and reserve cost was set up. Based on model 1, the time-of-use price optimization model was put forward afterwards. Finally, the three layers optimization model for time-of-use and interruptible price was established
Laser-Induced Electroless Copper Deposition on Modified Plastic Surface
Authors: Peng Xiao , Jiang Kai Yong
Published: January 2012

Metallization treating on the plastic surface without the mask technology was created by using a new method combining the laser technique with the electroless copper deposition,this method get rid of palladium as catalyzer in the traditional chemical plating which is high cost and environment unfriendly. The samples are examined carefully by the scanning electron microscopy; resistance and adherence of the Cu plating were inspected and analysised. The result indicated that it was feasible to fabricate compact,uniform,and good conductive Cu plating on the plastic substrate by using potassium sodium tartrate and EDTA2Na as chelating agent; the resistivity of plating is related to the deposition time; adherence is influenced by laser power,the excellent adherence to plastics surface are obtained when the laser power exceeds 5W.
Operation Mode and Cost Analysis of Pure Electric Vehicle Charging System with Polymer Insulation Materials in China
Authors: Qiu Fei , Han Ying , Liu Yan , Zhang Bao Zhong , Zhou Xue Jie , Zhang Guo Qiang , Zhao Xiang
Published: January 2012

As rapid economic and social development, energy demand will be showing a simultaneous increase in momentum. China's energy development process shows that the development of pure electric vehicle to China's energy structure optimization and the construction of the ecological environment have a crucial role in promoting. The paper discusses the operation mode of charging system with polymer insulation materials, risk assessment and cost analysis of electric vehicle charging mode. It is shown that the cost is a barrier of the marketization and commercialization of electric vehicle.
Study on Slag Entrapment of Molten Steel in Mold with Electromagnetic Stirring Technology
Authors: Yang Mao Lin , Li Zheng Song , Wei Fu Long , Cheng Chang Gui , Chen Xiong , Qi Shi Bing
Published: January 2012

Considering the process conditions of the continuous billet casting, this paper has studied the slag entrapment behavior of molten steel in mold by using of a water model, and analyzed the influence rules of the submerged nozzle immersion depth, the electromagnetic stirring intensity and the mould flux viscosity on the slag entrapment in mold. The results show that the surface velocity in meniscus gradually increases with the stirring intensity increasing and the submerged nozzle immersion depth decreasing. When the submerged nozzle immersion depth is shallower, the mould flux viscosity is lower, and the stirring intensity is high, the interface turbulence of the liquid steel and slag is more severe, slag entrapment may occur in the extreme state. In order to avoid the slag entrapment in the working condition, it is necessary to increase the submerged nozzle immersion depth and decrease stirring intensity mildly.
Design of Mould on Cold Rolling for CARB Bearing’s Arc Roller
Authors: Zhang Luo Ping , Ma Bo , Fu Jing
Published: January 2012

CARB bearing is a kind of compact aligning roller bearing with internal contact and slightly curved surface, which is the most important breakthrough of bearing technology in rencent 50 years. CARB bearing’s special structural design make it has unique advantages, for example, reducing the mechanical structure size, reducing cost, extending bearing life, reducing noise, improving radial load capacity and high temperature stability, etc, so it is widely used in the manufacturing industry. CARB bearing’s roller is cylinder with arc, this unique structure is suitable for adopting cold rolling technology
Hydroxyapatite–Carbon Nanotubes Composite Coatings on Ti Substrate
Authors: Liu Jin Song , Ji Xiao Li
Published: January 2012

Carboxyl multi-walled carbon nanotubes (MWCNTs) as the second phase in the hydroxyapatite(HA) composite coatings on Ti substrate, produced by a sol–gel route, were developed for biomedical applications. The crystallization of hydroxyapatite phase was investigated with X-ray diffraction(XRD) and the microstructure of the obtained composite coatings were studied by scanning electron microscopy (SEM). Bonding strength between coating and substrate were also investigated. The surface of the composite coatings were dense and uniform. The coatings had good adhesion to the substrate. As-prepared HA-MWCNTs composite coatings combining the osteconductive property of HA and the excellent mechanical property of MWCNTs will provide a promising material for potential bone replacements.
Kinematic Analysis of Humanoid Based on Screw Theory
Authors: Wang Xiao Rong , Wang Zhao Qin
Published: January 2012

It is more difficult and sophisticated to analyze the humanoid kinematics than the common industrial serial manipulator’s because of its high number of DOF, complex model, and balance constraints. Taking the advantages of the characteristics in the configuration of leg’s joints of humanoid, based on the screw theory, according to the trajectory planning of the center of mass and the feet, a method is proposed to solve the kinematics of humanoid’s legs using Paden-Kahan sub-problems approach. The solving process indicates that the mathematical modeling is of simpleness and briefness, while it is of convenience to solve the inverse kinematics
The Application of the Fuzzy-PID in the Circulating Water Control System with Constant Pressure
Authors: Meng Xiang Ping , Xu Hai Jun , Zhao Wei Na , Wang Hui
Published: January 2012

By analyzing the characteristics of the circulating water control system with constant pressure, we established the mathematical model of the system. However, the system with conventional Proportional-Integral-Differential (PID) controller can not achieve excellent dynamic and static performance. An adaptive Fuzzy-PID controller was designed by combining Fuzzy and PID control methods. And we simulated the system in MATLAB/Simulink with the methods of conventional PID and Fuzzy PID respectively. Compared with the method of conventional PID, the results showed that the method we had proposed has the better effect than conventional PID
Physical Field Evaluation Model of High Speed Ball-End Milling Hardened Steel
Authors: Jiang Bin , Xia D.H. , Zheng Min Li , Li Y. , Liu X.C.
Published: January 2012

Based on the experiment of high speed ball-end milling hardened steel, investigated the distribution characteristics of cutting force and cutting heat and wearing character of cutter, and set up analysis model of cutter physical field. Using failure criterion and safety margin of cutter, founded physical field evaluation model of high speed ball-end milling cutter. By means of physical field analysis and experiment, explored the influence of cutting parameters on cutting property during cutter wear. Results indicate that the method of safety margin and physical field evaluation model can evaluate cutting property of cutter effectively, the impact of feed per tooth on physical field and safety margin is noticeable, and high speed and small feed are helpful to improve safety margin and cutting performance of cutter.
Constitutive Relation Study for Vibration Isolation Rubber of Geometric Nonlinearity and Material Nonlinearity Based on Experimental Data Support
Authors: Zhu Cong Ling , Ding Zhi Gang , Xiao X.Q. , Wu S.T.
Published: January 2012

Static and quasi-static isothermal experiments were carried out on vibration isolation rubber sample pieces whose main raw material were nitrile rubber, Enhanced nitrile rubber and reclaimed rubber, then analysis and comparison on the acquired experimental data were carried out in detail. The causes of these phenomena were analyzed from macromolecules structure system entropy change. Mathematical model of the third time static loading of the above vibration isolation rubber sample pieces was established based on polynomial constitutive theory, considering softening effect and utilizing nonlinear data fitting technique. Mechanical performance parameters of the vibration isolation rubber material were studied in quasi-static cyclic loading condition, and vibration isolation performance was compared and analyzed.
Study on the Microstructure and Mechanical Properties of TiB2-Ti(C,N) Composite Ceramic Tool Materials
Authors: Liu Lin , Huang Chuan Zhen , Zou Bin , Xu Liang , Liu H.L. , Zhu H.T.
Published: January 2012

TiB2-Ti(C, N)-(Ni, Mo) composite ceramic tool materials were fabricated by the hot-press sintering technology. The effects of the content of Ti(C, N) on the microstructure and mechanical properties were investigated by XRD and SEM observations. It is shown that the grain size of the composites is small, the fracture surface is irregularity, the grain boundaries of TiB2 and Ti(C, N) are connected tightly, and a new crystalline phase of MoNi is formed. A small amount of Ti(C, N) is decomposed into TiN, and the decomposition of Ti(C, N) is intensified as the content of Ti(C, N) is increased during the sintering process. The fracture pattern is the combination of the intergranular mode and transgranular mode. It is found that the flexural strength and fracture toughness of TiB2-Ti(C, N)-(Ni, Mo) composites increase consistently owning to the addition of Ti(C, N), the maximum resultant mechanical properties of TiB2-Ti(C, N)-(Ni, Mo) composites are 1019.53MPa for the flexural strength, 6.89MPa•m1/2 for the fracture toughness and 23.65GPa for Vickers hardness.
The Influence of High-Speed Cutting Technics Parameter No Materials Removal in Turning High Alloy Antifriction Cast Iron
Authors: Ma L.J. , Gong Y. D.
Published: January 2012

Though the high-speed cutting experimentation of high alloy antifriction cast iron, the materials performance and request on tools in cutting were analyzed. Though single-factor experimentation, the factors of affecting on cutting efficiency were discussed, such as tools materals, cutting speed, feed speed and cutting depth. The results show that the durability of PCBN tools is higher, but the durability of ceramics and tungsten-cobalt carbide tipped tools is low. The influence curve of cutting speed to machining efficiency is a part of parabola. And the influence curve of cutting depth to machining efficiency can be divided two parts of materials removal and tools wear. In the ensuring of technical requirements of work-piece machining. The high cutting efficiency can be obtained, when cutting speed vc=75~100m/min, feed speed f≤8mm and cutting depth ap =0.1~0.3mm.
The Influence of Residual Stress on the Machining Deformation
Authors: Guo Hun
Published: January 2012

The key problems in 2D FEM simulation such as the establishment of finite element model, the initial stress loading, the distortion appraisal are solved and 2D FEM simulation model is built to analyze the milling distortion caused by the residual stress. The FEM model is verified by the elasticity theory. Some machining cases are simulated by using of the FEM model. The machining distortion caused by residual stress are analyzed and summarized using the simulation results.
The Performance Research of Automotive Crankshaft Based on ANSYS Workbench Collaborative Platform
Authors: Yu Qing
Published: January 2012

Crankshaft is widely used in the automotive industry, its quality has a direct impact on engine and vehicle performance. This paper the finite element analysis of crankshaft is discussed by using four different loads based on ANSYS workbench collaborative platform, thus the distribution of stress and strain is obtained and the relationships between arc radius and crankshaft stress is studied by changing the value of arc knuckle radius between the connecting rod journal and the crank at the junction of the transition, lastly the intrinsic mode of the crankshaft is analyzed. The results for the crankshaft provide a theoretical basis for designers and reference.
Cutting Properties on Interpenetrating Network Composites by Cutting Simulation
Authors: Fan N. , Guo P. Q. , Wang S.R. , Fu X.L.
Published: January 2012

A simplified model with periodicity space characteristics is presented to simulate interpenetrating network composites. The cutting process on this material is analysed by FEM. The results show that reinforced phase volume percentage(V%) has great effects on cutting deformation. When reinforced phase V% is larger, the cutting forces especially back force Fp fluctuate obviously which causes the whole manufacturing system to vibrate intensely.
Cutting Thickness of High Speed Ball-End Milling Hardened Steel
Authors: Yang Shu Cai , Jiang Bin , Li H.Y. , Zheng M.L. , Wang S.J.
Published: January 2012

In order to solve the problem of machined surface damage and machining efficiency decline that caused by the decrease of effective cutting thickness in high speed ball-end milling hardened steel, using high speed cutting adiabatic shearing model, analyzed the adiabatic shearing deformation on hardened steel, and proposed the criterion of chip separating position. Analyzed the force in the transformation process from cutting to plowing, the influence of cutter deformation on cutting thickness was studied, and established the minimum cutting thickness model. Having done finite element analysis of cutter and experiment of high speed milling hardened steel, the validity of the minimum cutting thickness model was proved. The results show that cutting thickness changes from small to large, and then from large to small under the influence of cutting trajectory and tool edge radius. The deformation of cutter leads to the increase of the minimum cutting thickness, and further enhances chip thickness thinning effect. High feed can compensate cutting thickness thinning and the minimum cutting thickness model provides an effective way to restrain the damage of machined surface and cutter caused by cutter plowing.
Structure Design and Simulation of Viscometer Based on Velocity Attenuation
Authors: Wang Hong Bo , Yao Ying Xue , Geng H.W. , Geng H.D.
Published: January 2012

A viscometer based on velocity attenuation is presented. It is used to measure viscosity of liquid at an arbitrary velocity. Structure of the viscometer is designed. A motor designed specially called Series-Motor is used as driven motor of the viscometer to keep the flow stability of test liquid. A solid rotor motor is adapted to reduce the cogging effect. Pressure-feed air bearing is adapted as support to minimize the resistance torque. Simulation is made in MATLAB. Results show that Series-Motor reduces the resistance torque besides the viscous torque and it provides slow speed motor to keep the flow stability.
Microstructure and Properties of 7A04 Alloy Prepared by Thixo-Forging
Authors: Tian Wen Tong , Cao Xia , Li Yi
Published: January 2012

The effect of thixo-forging process on morphologies of particles that affect fracture mode of 7A04 alloy was studied. Microstructure and fracture surfaces of thixo-forged samples were investigated by image analyzing technique and scanning electron microscopy. The analyses of the ruptured surface were conducted with specimens taken in-situ from ruptured surfaces of thixo-forged parts. It is suggested that samples fractured in an area with higher liquid fraction have superior mechanical properties, especially elongation, and consequently a failure type of inter-crystalline cracking could be the main fracture mechanism. On the contrary, samples fractured in an area with lower liquid fraction have inferior mechanical properties and the principal resistance force is created by the contacting solid particles, a failure type of trans-crystalline rupture could be the main fracture mechanism.
The Influence on Electrical Characteristics of Contact WCu and Ti3SiC2 Material
Authors: Li Zhan Kai , Wang Jing Qin , Zhang Fu Min , Li Meng Yu , Li Hao Hua , Li Si , Sun Yong Cui
Published: January 2012

Electrical contractor affects reliability and working life of switches and electrical equipment directly, which is the key component of high-voltage and low-voltage apparatus. Nowadays, all fields of mid-voltage and above are occupied by vacuum switch. The invention of contactor material CuCr promotes the development of electrical contractor material and vacuum switch though the weakness can not be ignored. This paper makes a study and analysis about the performance of traditional electrical contractor material WCu. Its believed that alloy WCu has the high conductivity and high thermal conductivity of W, and the ability to improve applying condition and reduce electrical corrosion of Cu. So the experiment is made to test electrical characteristics of material WCu which is doping with different element. The performance of a new electrical contractor material, named Ti3SiC2, which is better than alloy WCu is put forward. This material meets the requirement, including high voltage, huge capacity, small scale, for switching equipment to develop grid, as the new material has advantage of low density, high modulus, high melting point, and antioxidant and so on. The successful application improves its superiority in the field of electrical contractor material.
Zeta Potential of Sepiolite in Aqueous System
Authors: Chen Cong , Wang Fei , Liang Jin Sheng , Tang Qing Guo , Chen Ya Lei
Published: January 2012

Zeta potential of purified sepiolite in aqueous system was studied as a function of pH and solid content. From the experimental results, it was found that sepiolite surface acquired a negative charge in water at natural pH, and the value of zeta potential decreased with the increase of pH value. Solid content had effect on zeta potential, but it can be minimized by the increase of time.
Methods of Creation and Invention
Authors: Chen Ming Baio , Li Qing Shan , Wang Xiao Min , Yang Qing Xiang , Liu Wen Chang , Hong Wei
Published: January 2012

The paper discusses the creation and invention methods for materials creation and invention. There are many routes and methods for materials creation and invention. The invention and innovation of materials needs the innovation of materials theory; the theory of materials may use for direction the materials creation and invention. The innovation and invention includes the category, made, process, inspect and application, etc. of materials. The creation and invention of materials should process according to the need at present and in future; May-be using the creation and invention can induct the requirement for mew materials. It may study and learn about the ability of materials creation and invention. The space of materials creation and innovation is extensive. There are many routes and methods for materials creation and invention.
Enhanced Electrochemical Performance of Li4Ti5O12/C Composite Prepared by Solid-State Method
Authors: Wang Li , Shan Yu , Liang Guang Chuan , Ou Xiu Qin , Yu Guang Chao
Published: January 2012

Phase pure Li4Ti5O12/C composite was synthesized by solid-state method using Li2CO3and anatase TiO2as starting materials, and glucose, citric acid and oxalic acid as carbon sources, respectively. The effects of different carbon sources and various glucose amounts on the microstructure and electrochemical properties were systematically investigated. The as-prepared samples were characterized by means of XRD, SEM and particle size analysis. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling tests. The results showed that the Li4Ti5O12/C composite with 2wt% glucose exhibited the optimal electrochemical performance with a specific discharge capacity of 190.8mAh/g at 0.2C rate. The discharge capacity could still reach 151.0mAh/g after 80 cycles at 1C rate, exhibiting excellent cycling performance.
Interfacial Morphologies of Methanol-Melamine-Formaldehyde (MMF) Shell MicroPCMs/Epoxy Composites
Authors: Su Jun Feng , Wang Sheng Bao
Published: January 2012

The aim of this work was to fabricate novel microPCMs containing dodecanol by an in-situ polymerization using methanol-modified melamine-formaldehyde (MMF) prepolymer as shell material and investigate the interface morphologies of microPCMs/epoxy composites treated by a simulant thermal process with a 10 times repeated temperature variation. A series of microPCMs were fabricated by 1000-3000 r·min-1 emulsion speed with the PCM contents of 40-70%. Micro-cracks and gaps occurred after a thermal treatment in the interface of microPCMs and epoxy matrix obviously. The internal stress generated by the expansion or shrinking of the microPCMs was the main factor leading to the interface morphology changes and damaged of composites.
Determination of Reasonable Scope of Self-Stress for Concrete Filled Steel Tubular Arch Bridge
Authors: Zhou Shui Xing , Li Ling Jun , Ma Yue , Li Lu
Published: January 2012

According to the requirement of specification that steel tube of concrete filled steel tubular (CFST) arch bridge should be among elastic state in service stage, this paper obtained a maximum limit value of steel tube circumferential stress.Then based on the Von Mises yield criterion and principle of static equilibrium, the formula of the circumferential stress of steel tube and self-stress of concrete was built. The equation of restrained expansion rate and self-stress of concrete in accordance with general stress-strain relationship was established. The reasonable scope of self-stress should be controlled in MPa, which could ensure to reach the restrained expansion rate of concrete in closed condition.
Numerical Analysis of a Crack Emanating from Semicircular Notch with Connection to a Pre-Existing Crack
Authors: Sahnoun Mohamed , Ouinas Djamel
Published: January 2012

The real structures are of complex geometrical forms containing numerous zones of stress concentrations. These sites are characterized by weak sections due to the presence of notches which are the main causes of cracks initiation. The knowledge of the distribution of the stress field in the neighborhood of a notch is of an extreme importance for the analysis of the variation of the stress concentration factor with respect to the geometry of the notch. In this paper, the finite element method is used to study the effect of the existence of a microcrack on the behaviour of a notched structure. Then the behaviour of a crack emanating from the notch with the presence of the pre-existing crack is also investigated. It requires estimating the stress intensity factor at the crack tip, the length of the crack, the notch diameter and the angle between its bisecting line and the crack direction.
Study on the Influence of Process Parameters on the Distribution of Macro-Particles on the Surface of Films
Authors: Lang Wen Chang , Song Rong , Gao Bin
Published: January 2012

This paper systematically studies the distribution of macro-particles on the surface of film influenced by the substrate position under conditions of the same magnetic field, different pulsed bias voltage and reaction gas partial pressure, and analyzes the mechanism of macro-particles influenced by different parameters. This study indicates that the substrate position has a better effect on decreasing macro-particles than that of the pulsed bias voltage and particles in different substrate position are very different in their forms and appearances, which easily leads to uneven deposition; under the same bias, the number of particles firstly increases and then decreases with the increasing the distance from substrate position to the center, and the number of particles with over 2μm diameter largely decreases with the increasing the distance from substrate position to the center, so surface morphologies of films are improving; under the lower intensity of magnetic field, the distribution of macro-particles has a great change with the increasing the distance from substrate position to the center, and under the higher intensity of magnetic field, the substrate position has little influence on the distribution of macro-particles on the surface of film. Under the higher intensity (30G) of magnetic field, the distribution of macro-particles on the surface of film has minor change whatever reaction gas partial pressure and substrate position increase, and most particles are small in sizes and are solid spherical in shape. The higher intensity (30G) of magnetic field enhances the uniformity of film deposition and decreases the dependency of macro-particles distribution on other parameters.
Dielectric and Impedance Spectroscopic Studies of SrBi4-xLaxTi4O15
Authors: Ashok K. , Sarah Pasala , Raju V.S.
Published: January 2012

Ceramic samples of SrBi4-xLaxTi4O15with x=0.025 is prepared by standard solid state reaction method. The phase formation is confirmed by X-ray diffraction (XRD) studies. The Dielectric and Impedance measurement has been performed in the temperature range 50°C to 600°C and the frequency range 1Hz to 1MHz. The Curie temperature is found to decrease from 535°C to 505°C. The Cole-Cole plots are semi circles in the temperature range 450°C to600°C. The relaxation time is decreased with increase of temperature. The investigations on this material at high temperatures and frequencies reveal its stable behavior.
Solid Modeling and Motion Characteristics Analysis of Oval Gear Pair Based on the Tooth Profile Conversion Method
Authors: Yang Shi Ping , Zou Bao Jun , Sun Quan Min , Liu Jin Gang , Jiang Sheng Qiang
Published: January 2012

Based on the function of Chooks in MasterCAM, the section of a oval gear is generated. An oval gear 3D Model is established using the section in UG, then a pair of assembling oval gear in UG is imported into ADAMS, motion simulation results are validated and compared with the theoretical value. The results indicate that the profile conversion method can meet the design requirements in certain conditions of transmission accuracy, and effect of eccentricity to the transmission of oval gears is summarized.
Numerical Simulation of the Aerodynamics and Aerothermal Heating for a Hypersonic Vehicle
Authors: Liu Hai Yong , Qiang Hong Fu
Published: January 2012

A hypersonic forebody based on waverider and liftbody concept was presented. The configuration of a new hypersonic vehicle was designed by taking the configuration of X43A. Numerical simulation was conducted on the two-dimensional and three-dimensional models of the vehicle using CFD software of Gambit and Fluent. The effects of Mach number and attack angle on the aerodynamics and heat transfer were considered. The results of simulation investigation showed that: High compressed air was constrained beneath the pre-compressed surface of the forebody. The computational data on central cross section of the three-dimensional model for the vehicle was similar to that of the two-dimensional model. But great pressure gradient existed between the pre-compressed surface and side surface of the forebody which would lead to severe air leakage and pressure loss. The increasing of attack angle and Mach number enforced the stagnation of shock wave on the side walls of the engine. The thermal environment of the vehicle was deteriorated rapidly with increasing Mach number. But the viscous heating was overrated which lead to unbelievable high temperature. The software Fluent was more suitable to predict the aerodynamics than the heat transfer for hypersonic flow.
Study on Safety Assessment Modeling in Sijiaying Open-Pit Iron Mine
Authors: Lu Ming Juan , Zhu Ming , Liu Wen Sheng , Zhang Ai Xia , Ai Li Xin , Peng Ji Huan , Ning Lian Guang , Li Hua
Published: January 2012

Based on the analysis of potential safety problems and main factors effecting on safety in mining process, safety evaluation index system was constructed for Sijiaying Open-pit Iron Mine. The fuzzy subjection degrees are determined by setting up the fuzzy membership function, numerical value statistic and expert evaluation method. Analytic hierarchy process and fuzzy set method have been used to build the mathematic model, and then the evaluation results were given for reveal the disfigurement in mining process.
A New Pulse Modulator for Solid Propellant Attitude Control Motors
Authors: Sun Qi , Zhou Jun , Ge Zhi Lei
Published: January 2012

Antimissile interceptors with the attitude control motors (ACM) were researched. For solid propellant ACM, a pulse frequency modulation scheme is proposed, which is based on conventional PWPF modulator. The modulator extends the application of modulation control method to solid propellant ACM, and integrates it with a feedback of thrust estimation which is decided by location and thrust interaction factors. The stability of the new modulator was analyzed by Lyapunov method and a stability margin was given. Simulations show that the stability margin is conservative, but acceptable. Interceptor simulations using the modulator indicate that this technique provides closer-to-linear actuation than conventional bang-bang thruster control methods.
An Improved EMD Method and its Application in Nonstationary Signals Analysis
Authors: Chen Jian Hui
Published: January 2012

Empirical mode decomposition (EMD) method based on HHT has exhibited unique advantages such as adaptability and highly efficiency in many nonlinear, nonstationary signals processing applications. It breaks the uncertainty principle limit, but the traditional EMD still has its deficiencies. In this article, we construct a new wavelet which has excellent decomposing-frequency performance and energy concentration, and then an improved EMD method based on this wavelet is presented. Results of numerical simulation show the validity and efficiency of the method proposed in paper are better than traditional one. Furthermore, some foreseeable trends of time-frequency distribution technologies are described. The systems in reality, strictly speaking, tend to non-linear, so most practical signals are non-stationary random signals. Nonlinear, nonstationary signals analysis is a very significant and difficult problem in almost all technical fields such as automation, communication, aerospace- engineering, biomedicine, structural fault diagnosis and so on. Owed to the rapid development of large scale integrated circuit technology and artificial intelligence, the exploration of signal processing theories have got a sharply impetus. A series of new modern signal processing theories and methods have appeared to meet the need of time-frequency joint analysis of nonlinear, non-Gaussian and non-stationary signals, including discrete short-time Fourier transform, wavelet transform, Hilbert-Huang transform and so on. Time-frequency joint analysis can observe the evolution of the signal in the time domain and the frequency domain simultaneously, provide local time-frequency characteristics of the signal.
A New Roadside Detection Method Based on Obstacle Detection
Authors: Yu Chun He , Zhang Dan Ping , Guo Rui
Published: January 2012

In order to provide road information for outdoor mobile robot in a complicated environment, a new roadside detection method is proposed based on obstacle detection by applying a four-layer laser radar LD_ML. Because roadside obstacles distribute alone a road, theirs fitting straight lines are parallel to the road. The roadsides detection algorithm includes four steps: first, judge if there are obstacles along roadside or not; second, extract obstacles which belong to roadsides; third, build fitting straight lines through the roadside obstacles; at last, in order to obtain steady and precise roadsides, a EKF method is performed to track the roadsides. The results of experiment have testified the road roadsides detection algorithm has high stability and reliability.
Mechanical and Electrical Information Aggregation through Semantic Combining of Concepts
Authors: Peng Zhao Yang
Published: January 2012

In order to compute intelligent answers to complex mechanical and electrical information processing questions, using information existing in the Web, computers have (1) to translate such mechanical and electrical information, typically from text service, into a data structure suitable for semantic development; (2) to aggregate enough mechanical and electrical information about a certain topic or area by integrating these data structures, taking into account new mechanical and electrical information, additional details, better accuracy, and contradiction found in the incoming data structures to be added.This article seeks to solve point (2) by using a method CC(Concept Combining), with its algorithm and implementation, to integrate two concepts (coming from Web service) without human participation, producing a third concept. Results of CC working on concepts extracted from Web service are shown.
Performance of Reactive Plasma Cladding TiC Particle Reinforced High Chromium Fe-Based Ceramics Composite Coating
Authors: Wang Li Mei
Published: January 2012

TheIn SituSynthesized Tic Particle Reinforced High Chromium Fe-Based Ceramics Composite Coating Was Fabricated on the Substrate of Q235 Steel by Plasma Cladding Process Using Fe-Cr-Ti-C Composite Powder as Reactive Material. Microstructure of the Coating Was Observed by Scanning Electron Microscope (SEM), the Phases Were Determined by X-Ray Diffraction (XRD), and the Wear Resistance Was Evaluated under Dry Sliding Wear Test Conditions at Room Temperature. Results Indicate that the Composite Coating Consists of the Reinforcing Tic Carbide, (Cr,Fe)7C3Eutectic as Well as Austenite, and Is Metallurgically Bonded to the Q235 Steel Substrate. the Gradient Distribution of Tic Carbides Is Observed. Tic Particles Present in the Granular Shape in the Fusion Zone and Central Zone while Present in the Dendritic Shape on the Surface of the Composite Coating. Hardness of the Coating from Surface to Fusion Zone Varies a Little; the Average Hardness of the Coating Is about HV0.2750 which Is 3.2 Times as much as that of the Base. the Wear Mass Loss of Q235 Base Material Is 13 Times Higher than that of the Composite Coating.
Experiment and Research on Mechanic Behavior of Concrete with Different Addition Amounts of Polypropylene Fibers
Authors: Chen Yu Zhi , Xuan Wei Hong , Chen Xiao Hong
Published: January 2012

The effect of the different addition amounts of polypropylene fibers on the basic mechanical properties of concrete were investigated in this paper. The results show that the flexural tensile strength of concrete changed slightly after adding low-dosage polypropylene fiber(0.04%～0.16%); Axial compressive strength and flexural tension modulus decreased, limiting flexural strain increased gradually with the amounts of fibers rising.
Starch/SBR Biocomposites Prepared by Solid Blend Method: Effect of Surface Modification and Coupling Agent
Authors: Li Mei Chun , Ge Xin , Lim Jong Hyuk , Kim Min Su , Cho Ur Ryong
Published: January 2012

Starch/Styrene Butadiene Rubber (SBR) biocomposites were prepared by directly blending of starch and SBR on a two-roll miller. Two types of starch: pure starch and modified starch (M-starch) were used as rubber fillers. M-starch were synthesized by grafting of methyl methacrylate (MMA) monomer onto starch backbone using ceric ammonium nitrate-initiated radical polymerization. Coupling agent styrene-g-(maleic anhydride) (SMA) was used to further improve the interfacial interaction between the filler and rubber matrix. The morphology and mechanical properties of unmodified starch/SBR and M-starch/SBR biocomposites with SMA content of 0, 1, 3, and 5 phr were investigated. SEM observations showed the particle size of M-starch decreased and their dispersion in the SBR matrix significantly improved than unmodified starch. Mechanical properties of M-starch/SBR biocomposites were superior than those of unmodified starch/SBR biocomposites.
Design and Analysis of the Digging Spring Tooth of Stubble Harvester
Authors: Shao Dong Wei , Wang Jun Fa , Jiang Dong Hua , Wu Gui Fu
Published: January 2012

The developed corn stubble harvester can simultaneously finish such as the digging, picking up, cleaning, collection and Stripy laying stubble process and so on, but it cost more man-hour time because of the high digging resistance and high engine power consumption in digging stubble works. The digging spring tooth for corn stubble harvester including self-exited vibration S-shaped spring handle and curved chisel-shaped bionic tooth is designed based on the mechanism of drag reduction of self-excited vibration and bionic drag reduction for reduce digging resistance and power consumption, and the statics analysis of digging spring tooth is done by ANSYS software, the stress and strain distribution diagrams show the design is reasonable.
Research of Telecommunications Access Pricing Based on Evolutionary Game Theory
Authors: Li Nan
Published: January 2012

Telecommunications access price is the focus of interests and conflicts of all parties involved in interconnection, which involves the distribution of economic benefits. It is necessary to introduce government regulation to promote the smooth development of interconnection in order to guarantee interests of all parties. This text discusses the issue based on evolutionary game theory.
A Design of Intelligent Family Network Based on Distributed Control System
Authors: Mei Lu Hai
Published: January 2012

In order to promote the development and application of family intelligent network technology, in this paper, a design of intelligent family network based on distributed control system is introduced. The network communication and control structure of systems makes use of a distributed control system, the gateway makes use of construction of embedded systems, remote control design makes use of browser/server to achieve. The programming provides stronger advancement, creation, flexibility and reliability with great research significance and application value.
Magnetic Properties of Sm-Fe-N Prepared by Melt-Spun in Liquid N2 and High Gas Pressure Nitrogenation
Authors: Jiang W. , Si P.Z. , Wang H.X. , Lee J.G. , Choi C.J. , Liu J.J. , Zhong M. , Li Z.F. , Ge H.L.
Published: January 2012

Sm-Fe-N was prepared by melt-spun Sm-Fe with liquid-N2-cooled copper wheel and nitrogen absorption under N2 gas pressures up to 25 MPa. The structure and magnetic properties of the Sm-Fe-N prepared under varied temperatures, N2 pressures and nitrogen absorption time have been investigated systematically. The liquid N2 melt-spun process improves the homogeneity of the samples while the high N2 pressure increases the efficiency of the nitrogenation process. The Sm-Fe-N decomposes under 25 MPa N2 at temperatures above 743 K.
Real-Time Visual Analyses on Failure Criteria of Slope Stability in Strength Reduction Finite Element Method
Authors: Li Rong Jian , Zheng Wen , Liu Jun Ding , Xie Tao
Published: January 2012

The failure criteria in strength reduction FEM are not unified and often affected greatly by researcher’s experience and judgment, so it is necessary to discuss the applicability and the difference of some various criteria of instability of slope. According to the thought of visualization in real time computing, the corresponding visual program is developed based on some common failure criteria adopted simultaneity in the strength reduction FEM. Then, through the real-time visual interface, the comparisons of the common failure criteria are conducted. The results show that, the safety factor of a simple slope can be determined clearly from the inflection point of the computational curve based on the criterion of the characteristic nodal displacement and the criterion of equivalent plastic strain exceeding a certain value, by contrast, the safety factor which based on the criterion of the iteration non-convergence lag behind the others in the same condition.
Hardware Design of Ultrasonic Ranging System in Agricultural Robot
Authors: Zhang Fu , Fu San Ling
Published: January 2012

The hardware system of ultrasonic ranging system in agricultural robot was designed. This ultrasonic ranging system has two most components including the work machine and the receiver. The ultrasonic ranging system hardware design of the agricultural robot included the ranging module and the wireless transceiver module was researched, and the ranging module mainly included the sensors, the processor, the transmitters, and the receiving module mainly includes the receiver, the LCD display module, and the clock chip was analyzed. The result showed that the hardware system of ultrasonic ranging system can satisfy the function requirement of the agricultural robot.