bluuebunny/crossref_metadata_2025 huggingface dataset:
The Finite Element Analysis of Different Materials’ Anti-Seismic Performance of NC Tool Rods
Authors: Rong Ji Xu , Zhang Xin , Ji Jun
Published: September 2011

In order to improve the anti-seismic performance of the NC tool rods in the cutting processing, it’s necessary to study the knife shaft material’s influence to its anti-seismic performance. Based on the finite element analysis of the different materials’ NC tool rods, the study obtains their distribution diagrams of the displacement distribution and the maximal displacement parameters by simulation of the actual processing. And the results show that the material of the NC tool rods has an important influence on their anti-seismic performance, thus it provides a basis for the material of the NC tool rod’s choice and using.
Fire Investigations and Analyses for a Typical Agricultural County in Yunlin, Taiwan
Authors: Wang Yaw Long , Chang Yi Ming , You Mei Li , Chen Kun Yue , Lin Chun Ping , Shu Chi Min
Published: September 2011

Investigation of fire accidents is a primary and imperative procedure for human disaster prevention. It engages with the development on the planning program for disaster preventive-remedy and salvage in a city (or a county), and helps to mitigate this calamity effectively in the future, even for a nation. In this study, we investigated and analyzed fire accidents for one of typical rural areas in Asia–Yunlin county, Taiwan, from January, 2003 to August, 2005. This study deals with the statistical data from the Fire-Fighting Department, Yunlin county, Taiwan, including the frequency/probability, potential hazard grades of fire cases within its 20 administrative divisions, and fire occurrence causes, locations, times, divisions, etc., along with comprehensive surveys on the property damage and casualties in Yunlin county during these years. The analytical outcomes indicated that the higher the population concentration (Douliou city, Huwei town, Siluo town and Beigang town), the greater the probability for fire disasters for Yunlin county. This study could help develop corresponding strategies of fire prevention for an agricultural county and even promulgate related regulations to avoid future fire mishaps.
Study on Efficient Approach on Cost Control in the Stage of Architecture Engineering Design
Authors: Cui Cai Yun , Liu Yong , Yu Ning
Published: September 2011

In allusion to the significance of design stage to cost control in the engineering and based on analyze present problems in the design stage, it is a feasible way to put forward four efficient approaches in the design stage to control construction cost including quota design, design biding, value engineering and standardized.
The Web Classification Based on ROUGH-GA-BP
Authors: Duan Long Zhen , Zou Zhi Xin , Wang Gui Fen
Published: September 2011

The shortcomings of the BP algorithm are analyzed, and a text classification algorithm based on rough-GA-BP is constructed by combining the genetic algorithm with the rough sets theory. This algorithm reduces the data of the text input vector by the data reduction method based on rough sets theory, and presenting a genetic algorithm approach for feature selection. Experimental results indicate this method is more effective than traditional methods.
Temperature Fields Characteristics on Removal Rock by High-Energy Lasers
Authors: Yi Xian Zhong , Ma Wei Guo , Cai Zi Long , Jiang Sheng Zong
Published: September 2011

Laser drilling technology is a new feasible and developing method of rock destruction. The unified modeling method of laser and rock interaction is a complicated subject of heat transfer science. According to the energy conservation law, the fundamental equation of heat transfer is established. Some primary parameters such as enthalpy, thermal conductivity and specific heat are simplified respectively on the liquid-gas interface or the liquid-solid interface. The general mathematical model of temperature fields on laser drilling process is proposed. Using the Galerkin method, the numerical investigation of a practical example in laser drilling rock is analyzed.
Efficient Design of a Torque Actuator for Lower Extremity Exoskeleton Based on Muscle Function Analysis
Authors: Safavi Sahba , Selk Ghafari A. , Meghdari A.
Published: September 2011

Several lower extremity exoskeletal systems have been developed for augmentation purpose. Common actuators, have important drawbacks such as complexity, and poor torque capacities. The main scope of this research is to propose a series elastic actuator for lower extremity exoskeletal system which was designed based on muscle functional analysis. For this purpose, a biomechanical framework consisting of a musculoskeletal model with ten degrees-of-freedom actuated by eighteen Hill-type musculotendon actuators per leg is utilized to perform the muscle functional analysis for common daily human activities. The simulation study illustrated functional differences between flexor and extensor muscles and the results were utilized for efficient design of the series elastic torque actuator employed in lower extremity exoskeletons.
The Evaluating and Quantizing of Human Factors at Workplace
Authors: Li Pu Hong , Zhou Jun , Deng Jian Xin , Fan Zhi Jun
Published: September 2011

This paper is focused on the human factors and assessment methods at workplace firstly. Then the human factors are analysed and evaluated to quantized by Analytic Hierarchy Process and Entropy method. On that basis, the multicriteria quantizing model is build, at last the human factors at piston production line as an example is given. According to the result of model, it provides a scientific evidence to make the human factors in difference processes perfect: improving operating efficiency, optimizing working posture.
The Framework and Construction Rural Science and Technology Information System
Authors: Wang Shu Rong , Zhao Jin Song
Published: September 2011

In order to meet the rural science and technology information resource needs in the agricultural informatization process, adhere to construct and share the agricultural technical information resource. This paper designs a rural science and technology information management and sharing service system which has a reasonable structure, and faces the society, the network, intelligent, hopes to establish and perfect the share of long-term cooperation mechanism in the provinces.
Study on Preparation and Performance of MRF for Torque Transmission
Authors: Dong Zi Xin , Guo Chu Wen , Hou You Fu , Meng Qing Rui , Li Fei Hu
Published: September 2011

Based on the requirements of torque transmission for stability and saturation magnetization of magnetorheological fluid (MRF), an orthogonal test was designed to arrange for the preparation of MRF. MRF was prepared by chemical co-precipitation method, in which Fe3O4 nano-particles were coated with polyethylene glycol(PEG-4000). The size and distribution of particles were observed by transmission electron microscope (TEM). The saturation magnetization was measured by vibrating sample magnetometer(VSM). Through analysis of variance of orthogonal test,an optimal method for preparing a highly stable and saturation magnetization MRF was summarized. Four main parameters in preparation of MRF were discussed, including the rate of amount of substance between Fe2+and Fe3+, the rate of amount of substance between PEG-4000 and Fe2+, reaction time and the reaction temperature. It has important practical significance on the study of magnetorheological transmission device.
Small Problem, Big Crisis: A Study on the Importance of Fire Separation in Tall Buildings
Authors: Wang Yaw Long , Shu Chi Min
Published: September 2011

Risk is a concept that denotes the probability of the occurrence of dangers. The factors that generate fires and dangers are numerous, and always emerge in unapparent places. Once these factors are identified, a fire accident would happen and lead to great loss. For the fires happening in tall buildings that caused immense loss, the function of planned fire separation system was destroyed because the users had weak fire prevention concepts. One of the typical examples is the fire that happened and spread over Don-ke Building in Sijhih City, Taipei County, Taiwan. Based on the damage prevention concepts of property insurance agents, the study focused on the importance of the fire prevention management in tall buildings. The other part that was paid attention to is the Fire Safety Building strongly encouraged and propelled by the Architecture and Building Research Institute of Ministry of the Interior, with which the study conducted an investigation on fire risk management.
The Remote Fault Intelligent Diagnosis System Based on B/S Structure
Authors: Liu Jia , Zhang Chun Liang , Li Jian , Li Sen , Xiong Yue Hua
Published: September 2011

The feasibility and superiority of the remote fault diagnosis system based on B/S structure is analyzed in this paper. The B/S structure is introduced and compared with C/S structure briefly. The paper summarize frame and main function module of the remote fault diagnosis system and introduce its key technology, such as data acquisition technology, data transmission technology between server and client, intelligent diagnosis technology, database technology etc. The hybrid model of support vector machine (SVM) and hidden markov models(HMM) is used as a intelligent diagnosis method of the system, and a new design which could improve the integrity and privacy of the system database data is applied. According to the diagnostic results to all kinds of simulated faults in the Bently vibration test bed, it shows the system is not only stable, reliable and high accuracy, but also has a certain application value to engineering.
Amplitude Frequency Response Characteristics of Fe-Based Damping Alloy Simple Beams under Forced Vibrations
Authors: Huang Shu Ke , Zhou Dan Chen , Liu Jian Hui , Teng Jin , Li Ning
Published: September 2011

The amplitude frequency response characteristics of simple beams made by Fe-Mn damping alloy, Fe-Cr-Mo damping alloy and 0.45C-steel under forced vibrations were studied using forced vibration measurement instrument. The results indicated that at forced vibration condition, the damping behaviors of Fe-Mn and Fe-Cr-Mo alloy beams were that the resonance amplitude and the resonance frequency range were reduced. The higher the exciting force was, the better the damping capacity of Fe-Mn alloy beam was, so it was suitable for the environment where higher vibrating force and shock existed. Whatever the exciting force was high or low, the damping capacity of Fe-Cr-Mo alloy beam was higher than 0.45C-steel, so it was more suitable for the environment where the strain amplitude changed in a wide range.
Toughness and Internal Friction of Weld Metal Welded by High-Current MAG Welding
Authors: Pan An Xia
Published: September 2011

Low-temperature impact test on four different kinds of weld metal welded by different technologies of high-current MAG welding was carried out in this paper. The results show that different materials and different welding parameters have different effect on impact energy. As the chemical analysis and observation from the optical microscope show that When welding material contains appropriate C, Si, Ti, fine acicular ferrite forms in it; on the contrary, crisp and thick bainite appears. Compares to acicular ferrite which has an Akv>27J at -27°C and better toughness, bainite has a poor toughness and an Akv<27J. The internal friction experiments show that there are two internal friction peaks - Snoek and SKK. The peak is clear when the microstructure is bainite, on the other side, the microstructure is acicular ferrite.
Experimental Study on Bionic Screw Pile of Reducing Adhesion and Resistance
Authors: Zhang Dian Wu , Wang Yu Xing , Tang Yan Qin , Zeng Wen
Published: September 2011

The surface of compound eye of ant was observed by using scanning electron microscopy technology. These characteristics on the surface were applied on cone of screw pile for preventing flood and rushing to deal with an emergency. Comparing experiments of piling were conducted before and after the bionic surface was made, and these experiments were conducted under three different soil environments, including soil among the Yellow River, the Yangtze River and the Pearl River. In the experiments, data of strain was tested and collected by dynamic strain gauge RA2300 style. The output was recorded on disc and later the data were processed by computer. The observation results showed that the compound eye of ant was made of a lot of small convex eyes. These small convex eyes were arranged in dense style. They had the characteristics of convex dome. The results of piling experiments showed that the bionic screw pile with bionic surface of cone produced better effect of reducing soil adhesion and resistance than the common screw pile with no bionic surface of cone.
The Involvement of Coloring Agent, Cu, and its Effects on the Optical Performance for Color Glass
Authors: Bai Xiao Hua , Hao Xiao Guang , Li Shu Jing , Dai Li Ping
Published: September 2011

The paper presents the study by changing of Oxidizability –Reducibility of mixed batch glass material and changing the quantities of Coloring agent, Cu, in glass melting. The analysis of Spectrum Transmittance and Chroma Index have been carried out on the different sample plates obtained in the glass melting. The test results indicate: The wavelength T≥52.73% shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 473.06( i.e. the quantity amount of CuO in percentage is 0.3%) . b) When a= 0.596 and b=6.560 was shown in the Chroma Index of glass. The wavelength T = 10.33% at lowest shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 160.23( i.e. the quantity amount of CuO in percentage is 0.3% as well) b) When a= - 18.039 and b= - 9.178 was shown in the Chroma Index of glass.
ABS Fabrics Chemically Plated by Cu/Ni-P as Electromagnetic Shielding Material
Authors: Yu Cheng Da , Li Ping , Wang Yong Feng , Tang Lei
Published: September 2011

In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) was increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE increased gradually, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.
Effect of Lorentz Force on Non-Axisymmetric Thermo-Mechanical Behavior of Functionally Graded Hollow Cylinder
Authors: Jafari Fesharaki J. , Golabi Saeid , Atrian Amir
Published: September 2011

This paper presents the effect of the non-axisymmetric magnetic and steady state thermal load on thermo magneto mechanic functionally graded (FG) hollow cylinder. An analytical solution for stresses and Lorentz force were determined using the separation of variables and complex Fourier series and the power law functions for material, except Poisson’s ratio, through the thickness of the cylinder. The results show that the magnetic field has a significant effect on stresses and displacements along the cylinder and with the specific magnetic field vector the stresses and displacements along the cylinder can be controlled and optimized. The aim of this work was to understand the effect of Lorentz force on a functionally graded hollow cylinder subjected to mechanical, thermal and magnetic load. The magnetic field decrease circumferential displacements and stress and increase the radial displacements and stress due to thermo mechanical loads.
The Effect of Titanium Addition on Microstructure and Properties of Laves Phase Cr2Nb Alloy Synthesized by Hot Pressing
Authors: Xiao Xuan , Lu Shi Qiang , Dong Xian Juan , Huang Ming Gang , Liu Jun Wei
Published: September 2011

The composite materials with a nominal composition of Cr2Nb-24wt.%Ti were fabricated by mechanical alloying followed by hot pressing. The microstructures and properties were investigated on the composites contained with Laves phase prepared through 20 hours mechanical alloying of chromium, niobium and titanium elemental powders and hot pressing at 1250°C for half an hour. The results indicate that the near full-dense Laves phase Cr2(Nb,Ti) based alloy with homogeneous composition and microstructure is obtained by mechanical alloying and hot pressing techniques. The dispersed soft second phase Nb solid solutions with the fine grain size less than 1μm are distributed uniformly on the matrix. The sample has a relative density of 99%, fracture toughness of 5.32MPa•m1/2 and compress strength of 2080MPa. Due to the effect of fine-grain and alloying addition, the toughening of the Cr2(Nb,Ti) based alloy has been fully realized.
The Application of Blast Furnace Slag in Cementitious Self-Leveling Mortar
Authors: Yang Xin Ya , Li Chao , Wu Jiang Hong
Published: September 2011

This article presents a study on the adequate application of blast furnace slag to replace quartz sand in cementitious self-leveling mortar. The results show that the strength of mortar decreases slightly, because slag sand can drag in some air bubbles which can form holes in the harden mortar. And compared with quartz sand, its compression strength loses only 4.6 % on 28d age. the proportion of 75 % slag sand and 25 % quartz sand was the best proportion as coarse filler.
Defect-Related Photoluminescence from SiO2 Thin Films by Si-Ge Ions Doped
Authors: Zhong Kun , Xia Yan Dong , Miao Ju Hong , Fu Jiang
Published: September 2011

Si and Ge ions are implanted into SiO2 thin films, subsequently the annealing treatment are carried out. The samples exhibit photoluminescence (PL) peaks at 400, 470, 550 and 780 nm. With the annealing temperature increasing, the intensity of 400-470 nm PL band increases remarkably. After oxidation annealing treatment, the intensity of 400-470 nm PL band decreases, and that of 550 nm and 780 nm PL peaks rises. Combing with the results of X-ray photoelectron spectroscopy(XPS), X-ray diffraction (XRD) and PL measurement, we propose that the PL peaks at 400 nm, 470 nm, 550 nm and 780 nm originate from ≡Ge−Si≡ center, ≡Si−Si≡ center, SPR center and GeO center, respectively.
The Critical Conditions of Ferroelectric Domain Switch with Different Porosity and Pressure
Authors: Wu Jing , Li Wen Fang
Published: September 2011

This paper carries out the research on the critical conditions of ferroelectric domain switch with different porosity and pressure. A micromechanics model is established with the influence of external electric field, stress load, domain wall energy and depolarization energy, etc. The results show that the domain switch critical dimension and nucleation energy decrease fastly in the initial stage and then decrease slowly as the reversed electric field evenly increases. The critical dimension and nucleation energy with different porosity and pressure are studied, too.
Study on Coating and Technological Conditions of LLM-105
Authors: Wang Hong Jie , Liu Shan Shan
Published: September 2011

For the study of new insensitive energetic material LLM-105`s coating and techniques, by means of theory analysis through the interface, calculation of the contact angle test, verified that EPDM can coat LLM-105. Booster samples were prepared by adopting water suspension method with EPDM is the adhesive. And the coating’s optimal technological condition is also be verified. The results showed that, the obtained LLM-105/EPDM booster can be coated better. The final results of the improved optimal technological condition is with vacuum degree is 0.03mpa, stirring speed is 430r/min, dropping speed is 0.06ml/min.
Effect of Air Position to the Mechanism of Air-Decked Blasting
Authors: Wu Liang
Published: September 2011

Based on the JHC model of concrete damage evolution, the dynamic stress characteristics and failure mechanism of blast-hole near-field about different air-decked charge structures are studied by numerical simulation. Result shows that the failure mechanism of typical elements changes from compression-shear failure into shear-tensile failure gradually with the increase of their position in indirect initiation of both top-air-decked and bottom-air-decked charges, because of the affecting factors of the freedom and the loading from the hole. If middle-air-decked charges detonate from the top and bottom at the same time, loading and unloading waves in blasting hole are more influential to the damage of bottom elements than the surface freedom, because detonation waves of both top and bottom meet at the middle hole, so it is conducive to the media failure at the bottom hole, the elements of freedom surface have the same failure properties to top-air-decked charge.
Analysis of Temperature Field on Infrared Active Detection of Heavy Pressure Vessels Wall Surface Defect
Authors: Wu Guo Zhong , Song Fen Fen , Li Dong
Published: September 2011

Infrared thermal imaging technology is a new nondestructive detection technology, which is widely used in pressure vessel detection. In this paper, three-dimensional temperature distribution model of pressure vessel with defects is established, and the influence factors on infrared detection of pressure vessel defect are researched. The influence of environmental factors, thermal excitation strength, thermal excitation time and defect size on infrared detection is analyzed. The results show that: (1) increasing thermal excitation can degrade the maximum reduced temperature when infrared radiation thermal excitation temperature is lower than 200°C, while the reduced temperature can be raised with the increased thermal excitation when the temperature is higher than 200°C. (2) the maximum comparison temperature increased first and decreased afterwards with the increasing thermal excitation time, finally reduce to the comparison temperature under steady state. (3) the influence of wind speed and surface blackness in environmental factors on infrared detection precision is greater.
Fabrication and Application of CVD Diamond-Coated Copper Wire Drawing Die
Authors: Tang Qing Shun , Yang Yuan Hui
Published: September 2011

To improve the surface quality and adhesion of diamond film is the key factors to realize CVD diamond coating widely applied in the wear-resistance parts field. Through optimizing deposition process parameters, the article used the straight wiredrawing chemical vapor deposition to depose the diamond film in the bore surface of WC-CO carbide wiredrawing mould. The surface topography of the coating, film quality and surface roughness were detected and the preparation of CVD diamond film coated wire drawing mould in drawing copper wires production line was applied. The experimental results show that working life of diamond film coated wire drawing mould improved to 40~ 50 of that traditional hard alloy mould, and the controlled copper wire had the better precision and surface quality.
The Study of Hot Embossing and Bonding Machine for Microfludic Chips Fabrication
Authors: Zhang Feng Lian , Zhu Jing
Published: September 2011

With the development of science and technology, microfludic chip has become the leading edge in biochip research field, representing major development trend of micro-total analysis system (μ-TAS).Having features of high speed, high efficiency, low consumption etc., it possesses extensive application prospect in fields of gene analysis, disease diagnosis, drug screening etc.. Traditional microfludic chip adopts silicon slice, glass etc. materials to conduct processing with complex technique and high cost chip, thus it is not in favor of promotion and application of chip. The research on hot embossing and bonding machine for plastic microfludic chips fabrication is that to provide efficient processing machine for chip market which is expanded with each passing day. Based on present hot embossing technology of plastic microfludic chips and aimed to realize automation and batch process, the thesis conducts design research on mechanical construction of hot embossing and bonding machine for chips.
Efficiency Comparison of some Natural Products on Corrosion Inhibition of Al-Mg-Si Alloy
Authors: Rosliza R. , Wan Nik Wan B. , Izman Sudin
Published: September 2011

The comparison of the efficiency of some natural products (natural honey, vanillin and tapioca starch) on corrosion inhibition of Al-Mg-Si alloy is investigated in seawater solution at room temperature, using potentiodynamic polarization (PP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. The evolution of the corrosion potential (Ecorr) and corrosion current density (icorr) obtained from Tafel extrapolation of polarization curves, and the polarization resistance (Rp) values determined from LPR and EIS measurements indicate that the corrosion rates of Al-Mg-Si alloy decrease with the increasing the natural products concentration. In all cases, the increasing order of inhibition efficiency is: Natural honey < Vanillin < Tapioca starch.
Design of Mobile Jumping Robot Based on DSP2407
Authors: Fu Xiu Hui , Mu Jun
Published: September 2011

The paper designs a kind of mobile jumping robot that can choose different movement strategies according to different surroundings. In order to achieve the purpose, we provide the integrated design of the robot which contains the information collection system and the mobile system. Then we describe the hardware structures and the control process in detail. First, we create the mechanical structure and analyze the kinematics model of it. Second, we give the specific design of the mobile actuating mechanisms. At last, we design the hardware circuits and control system of the robot based on TMS320LF2407A chip and put the robot into the experiments. Through the experiments, robot combines the wheeled movement and jumping movement effectively. The ultrasonic sensor is added to robot, and it makes the one smarter than any other traditional robots. The diversity of movement enhances the robot environmental adaptability and expands the range of application.
The Deposition Rate of Ti Film by Plasma
Authors: Huang Shuang Hua , Lai Qi
Published: September 2011

Ti film on AISI 201 was prepared by plasma. The film was characterized by SEM. Their deposition rates were measured by measure the mess of Ti film(m) and the preparation time(t). SEM show that the more time is, the thicker Ti films is. The stronger power is, the thicker Ti films is. And the far the distance is, the more thin Ti films is. It was found that the deposition rates range from 0.02 mg.min-1 to 0.025 mg.min-1 at the area of 6.25cm2. The deposition rate of titanium film change with the deposition power range from 0.021 mg.min-1 to 0.163 mg.min-1. The deposition rate of titanium film change with the deposition power range from 0.096 mg.min-1 to 0.130 mg.min-1. The deposition rate of titanium film change with the deposition negative bias range from 0.008 mg.min-1 to 0.02mg.min-1 at the area of 6.25cm2.
Research on Changing Regularity of Green Sand Properties
Authors: Sun Qing Zhou , Jing Jian , Zhang Pu Qing , Huo Yu Shuang , Zhao Zhong Kui , Wang Jian
Published: September 2011

The research represents the actual effect of clay and core sand content on the permeability, compressive strength and hot wet tensile strength of green sand by adding clay and core sand into green sand mixture in order to simulate the actual situation of clay and core sand continuously increasing in the used sand during the foundry production. It was found that the content of clay and core sand affect the permeability, compressive strength and hot wet tensile strength of molding sand. With the content of clau and core sand increasing, the permeability of molding sand reduces and has a peak when core sand reaches certain content; the strength of molding sand is high and stable when the content of clay and core sand is below certain amount, and then decreases with the content of clay and core sand increasing. For green sand with resin bonded sand, the effect of clay on hot wet tensile strength appears a curve of “Peak shape”, while for green sand with sodium silicate bonded sand, the effect of clay and core sand on hot wet tensile strength appears “Annual Ring shape” as whose center is the coordinate’s dot.
Experiment of Gray Iron Abrasive Wear for Wheat Grain Powder
Authors: Zhang Ke Ping , Huang Jian Long , Wu Jing Feng
Published: September 2011

In this study, the abrasive testing machine which was similar to the roller mills was used. It used orthogonal test design and cast iron as the wear material. The main factor effected wear results such as abrasive particle size, rotation speed and rolling gap between the metal materials surface of two rollers were considered in order to find out the best value of each factor and optimize the condition of wheat grinding. Furthermore the wear properties of grain powder on cast iron and wear mechanisms were discussed. The results showed that powder size is the most important factor of the wear properties, the gap is the secondary factor and rotation speed is third. The wear loss is minimal while size is 0.2mm, gap is 0.5mm and rotation speed is 181± 2r/min.
Study on Thermodynamic Principle of Preparation of VC by Carbon-Heat Reducing
Authors: Li Ze Rong , Cao Zhi Qin , Fang Min Xian
Published: September 2011

This paper analyzed thermodynamic principle of preparation VC,VN and V(C,N) with V2O5 and C by carbon-heat reduction. The results show that synthesizing process includes phase change and the vanadium oxide is reduced gradually. And because of the reaction kinetics, there are no obvious boundaries between each reaction. There are two principles for V2O5 reducing by carbon thermal method. One reaction depends mainly on CO/CO2 gas-solid transmitted and another reaction depends mainly on the solid-solid reaction between carbon and vanadium oxide. But no matter what kind of mixing method, two kinds of reaction mechanism are also present in different degree. The reacting principle which is primary is depended on original mixed condition between V2O5 and C. It is propitious to reducing process by increasing temperature. The preparation of VC should be done at the condition with CO or vacuum.
Effects of Alloy Powder for WC/Steel Base Surface Composite Structure and Interface
Authors: Sui Yu Dong , Jiang Ye Hua , Li Zu Lai , Shan Quan , Liu Fei
Published: September 2011

Use Cr15 high chrome steel as base, WC particles as reinforcing particles, and adopting casting-infiltration method, a kind of quite steel-base surface wear-resistant material was prepared. The effect of Alloy powder for WC/steel base surface composite structure and interface was tested by OM, SEM and EDS. The results showed that after adding nickel powder into the composite layer, martensite, austenite, pearlite and eutectic carbide distributed in the matrix; after adding tungsten iron powder into the composite layer, more martensite distributed in the matrix; after adding molybdenum iron powder into the composite layer, martensite, austenite, pearlite and carbide distributed in the matrix. If the base material was high chrome (Cr15) and adds molybdenum iron powder in the composite layer, composite layer interface transition is good, more WC particles and irregular small carbide particles in composite layer.
Experimental Study on CTOD Fracture Toughness of Welded Joints of Low Temperature Steel
Authors: Fang Zong Tao , Sun Bo , Li Chun Run
Published: September 2011

According to BS7448 fracture toughness test standard, crack tip opening displacement (CTOD) for ASTM A333 Gr.6 low temperature steel which is used in offshore platform were carried out in low temperature (0°C, -29°C). Three point bending tests were conducted on the specimens, the dimension of which is B×2B (B is the thickness) and notch direction is NP. The final value of CTOD was calculated by P-V curves of both the welds and HAZ (heat affected zone). And the experimental results were analyzed and discussed in the paper. The low temperature steel welded joints show good low temperature toughness, the selected welding procedure is applied to construction of pipelines.The CTOD value of HAZ is larger than weld metal and weld is the weakest position in the whole structure. The experiment results provide an important basis for the choice of welding method and welding process parameters, ECA assessment and construction of offshore platform.
Fabrication and Properties of Al2O3 Short Fiber Reinforced Aluminium Matrix Composites
Authors: Yang Yong Shun , Feng Ke , Zhao Wen Xia
Published: September 2011

The Poly-crystal alumina short fiber reinforcing 2024 matrix composites was produced by the gas pressure infiltration, and a new apparatus has been developed for the infiltration of MMCs by the gas pressure infiltration technique. The reasonable sintering parameter for the preform were determined.The preform was heated at 450°C to remove the organic binder and pore-forming material, and then heated at 1050°C for 2.5h to obtain the comprehensive properties.Scanning electron microscope was used to observe the tensile fracture of Aluminum matrix composites, and the fracture feature of composites produced in different temperature was analyzed. The melting temperature of 2024Al was 800°C and holding time was 20mins; the infiltration gas pressure was 0.5Mpa and holding time was 20s.And then interface reaction is appropriate between the fiber and matrix ,a good performance of composites was produced.
Research on the Stress Fatigue Assessment about the Hot Spot Stress on the Bogie Frame
Authors: Wang Bin Jie , Li Qiang , Liu Zhi Ming
Published: September 2011

As the loading conditions for the railway vehicles are becoming more and more complex, nominal stress has been unable to fully satisfy the requirements for assessing fatigue strength for weld structures. Hot spots stress is much more closer to the actual stress of a weld structure, it can suit the demand of high speed trains’ fatigue evaluation better. In this paper, on the basis of UIC615-4 standard, the nominal stress of the welded bogie frame was calculated and its fatigue strength was assessed using FEA method. Also, set the joint section between drawbar seat and the transom bottom flange as the object of the study, succeeded in evaluating the hot spot stress of the welded bogie frame. Compared the hot spot stress calculation result with the nominal stress from shell elements, the result shows that hot spot stress is higher than the nominal stress. Using the hot spot stress to assess fatigue has the higher reliability
The Formation of Super-Thin Dielectric Film on Porous Substrate and its Stopping – Transmittance Characteristics for Particles
Authors: Chen Li , Li Ye , Qin Xu Lei , Wu Kui , Jiang De Long , Tian Jing Quan
Published: September 2011

The formation of super-thin continuous dielectric film (e.g. the ion barrier film-IBF) on microchannel plate (a kind of porous substrate) is most important for prolonging the operating life of the third generation micro-light image tube. In this paper, firstly, the formation of Al2O3 ion barrier film on microchannel plate (MCP) using a new contamination-free technology was introduced. According to the analysis and the comparison with the traditional direct formation technology, it was found that the productivity of the new technology is better (90%) and the carbon contamination can be minimized. Next, the stopping and transmittance characteristic of the film for electrons were studied and the measurement principle was shown. In this measurement, the concepts of “dead-voltage” and “electron transmittance” were proposed to evaluate the stopping and transmittance of the film for electrons. The dead-voltage was 220V for the MCP covered the ion barrier film with a thickness of 5nm and the electron transmittance was over 90%.
A Method of MEMS Package Using Local Laser Bonding
Authors: Cheng Li , Zhang Yi Xin , Xu Jiao , Yan Ming
Published: September 2011

The negative effect of the conventional laser bonding caused by high temperature has been analyzed in the Si-glass bonding process. A new method which is the combination of chip surface activated pre-bonding and laser bonding has been proposed. The method has been used for Micro Electro Mechanical System package experiment. The process is: firstly, a hydrophilic surface was formed by using a special chemical method. Secondly, Si and glass were pre-bonded at room temperature. Finally, the laser with the wavelength of 1.070 μm, spot diameter of 480 μm, power of 70 W was local heated by the laser. This method achieves low-temperature bonding without external press. And the tensile test also shows that the strength of sample bonding reaches 2.8 MPa~3.2 MPa. So it not only ensures the quality of MEMS chip, but also reduces the cost of the package.
Synthesis and Properties of a Modified Sponge Iron for Removing Dissolved Oxygen
Authors: Xu Bo , Jia Ming Chun , Men Jin Feng
Published: September 2011

In order to improve the performance of sponge iron for removing dissolved oxygen, sponge iron was originally modified by chemical replacement copper plating and the optimum modifying condition was obtained by orthogonal experiments. The effect of each modifying condition on the dissolved oxygen (DO) level in the outlet treated by modified sponge iron was investigated. The operating condition of packed bed was also investigated. The results showed that the performance of modified sponge iron for removing DO was improved obviously. The optimum modifying conditions were as followed: the concentration of CuSO4·5H2O was 40 g/L, citric acid was 80 g/L, the concentration of sodium tartrate was 45 g/L, the concentration of H2SO4 was 60 ml/L, modifying time was 120 s and temperature was 50 °C. DO in outlet water from optimum modified sponge iron packed bed increased initially and then decreased with increasing each modifying condition respectively. DO in outlet increased by increasing the flow rate or decreasing the bed height, and there were no DO detected when the packed height was 35 cm and the flow rate was not above 32 L/h.
Fatigue Analysis of Pure Waterjet Nozzle-A CFD and FEA Approach
Authors: Li Quan Chang , He Kai , Du Ruxu
Published: September 2011

The utilization of pure waterjet for Incremental Sheet Metal Forming (ISMF) is growing. However, the fatigue of pure waterjet nozzle is not fully clear. In the current study, based on the computational fluid dynamics (CFD) and finite element analysis (FEA), the fatigue failure of pure waterjet nozzle was simulated and analyzed. The influence of uneven equivalent stress distribution and generation of cavitation on nozzle fatigue failure was discussed. The results obtained from two simulations (velocity, pressure) show a good agreement with the theoretical predictions, which indicates that the approach based on CFD and FEA is absolutely feasible. Due to the uneven equivalent stress distribution, there is the first failure point inside the nozzle, which reduces the whole life of the nozzle. The unreasonable nozzle structure is one of main causes of cavitation generation; cavitation damage is reduced by optimizing the structure to improve the overall life of the nozzle.
The Manufacturing of the Bamboo Buffer Packaging Material
Authors: Liu Ye , Wang Shi Hang
Published: September 2011

At present work, to make cushioning packaging material from the bamboo fibers. Change the time of the surface treatment and the component contents of foaming agents, adhesives, plasticizers, cross-linking agents, etc. to analyze the effects on the foam density, foaming rate, elasticity, and bubble diameter. The best reagent and the optimal ratio of the various components have been identified. Determined the parameter of foaming techniques based on the high efficiency and no polluting foaming mechanism. Experiment with the impact testing machine to obtain the maximum acceleration - static stress curve, dynamic stress - strain curves, dynamic buffer factor - stress curve, Analyzed the dynamic buffer performance on the of changing the drop height and compared with other cushioning material. we know that: at height of 450mm, the product had lower peak acceleration value than EPE and EPS during the stress area of 2.8-5.4kpa, which means the cushioning property of the bamboo pulp product is better at that time.
Research on Impact Factors of Thermal Insulation Material Based on Grey Relational Analysis
Authors: Zhao Xiao Gang , Zhou Yi , Pan Shi Xiang
Published: September 2011

According to application of thermal insulation materials in the practical construction of electrical heat tracing in viscous oil pipeline, impact factors of rigid polyurethane foam widely used as new insulation material are systemically analyzed by Grey Relational Analysis (GRA) in the theory of Grey System to find out priorities among those factors. To further study their performances and to improve the quality of constructions, ten field experiments were carried out in Tanggula Mountain. The foaming conditions and the performances of the rigid polyurethane foam were recorded to be analyzed by GRA. The analysis results, acting as scientific guidance for construction, show that the insulation quality of rigid polyurethane foam is mainly determined by the ratio of components, thus the priority is to control such dominant factor and overall consideration of other factors should be taken to ensure insulation quality in the foaming process. More field experiments prove that the ratio should be controlled between 1.15 and 1.18 to ensure the thermal insulation.
Deformation Behaviors of Tube Rotary-Draw Bending Filled with Steel Balls
Authors: Shi Song Chao , Yang Lian Fa , Guo Chen
Published: September 2011

Wrinkling, wall thickness overthinning and cross-section distorting are main defects that seriously affect the forming quality of the tube in bending process. In this paper, numerical simulation based on PAM-STAMP 2G is conducted for the tube rotary-draw bending filled with steel balls as pressure transferring medium to analyze the deformation behaviors under various internal pressures. The results show that, tube bending filled with steel balls as pressure transferring medium can effectively restrain the defects of wrinkling and cross-section distorting. In addition, wrinkling and cross-section distorting of the bent tube decrease, the wall thickness thickening at the intrados of the bent tube decreases while the wall thickness thinning at the extrados increases with the internal pressure.
The Surface Hydrophilicity of Polypropylene Non-Woven Treated by Atmospheric Glow Plasma
Authors: Zhang Yan , Liu Rui Juan , Shang Zhong Xuan , Lv Yin Ding , Gu Biao
Published: September 2011

In this paper, polypropylene (PP) melt blown non-woven fabric is treated by atmospheric He, He/O2 or He/CO2 glow discharge plasma. The variation of the surface hidrophilicity of PP sample is experimentally investigated by the surface water contact angle. The results show that the surface water contact angle firstly has a sharp decline and then up to saturation. It is worth noting that the time the water contact angle is up to saturation greatly shortens when a spot of O2 or CO2 are added into the atmospheric He. In addition, when the PP samples are treated by the atmospheric glow discharge plasma, it is necessary of selecting a right applied voltage.
Finite Element Simulation of Temperature Field on Laser Cladding Layers Regulated by Micro-Forging
Authors: Zhou Ju , Qiu Chang Jun , Cheng Xi Yang
Published: September 2011

Micro-plastic deformation was produced on the surface of the laser cladding layer by micro-forging, thus cracks were healed in cladding layer; in order to reduce the thermal stress, preheating the substrate was needed to reduce the temperature gap between cladding layer and substrate. In this paper, temperature field by micro-forging on laser cladding Ni60 layer was simulated on software named DEFORM-2D. Compared the width of cracks, the results showed that reasonable and effective preheating temperature could ensure to reduce or eliminate cracks on laser cladding layer.
Design of the Inversion Power-Supply Control System Based on DSP
Authors: Wang Quan , Qin Juan Ying , Qin Xing
Published: September 2011

This paper presents the inversion power-supply control system with the software of dual SPWM modulation system and voltage closed loop PI control strategy and the hardware foundation of DSP TMS320LF2407A. Aiming at the requirements of rapidity of system, it adopts the feedforward and amplitude control strategy on aspect of control strategy to reduce the dynamic response error. Aiming at the requirements of stability and stationarity, it takes the segmentation intelligent PI control strategy. In order to avoid the system oscillation caused by the input direct current voltage fluctuation, it designs the voltage sluggish loop in the software. It has significant effects in improving the inversion wave form, anti-interference and anti-bias magnet, ensuring the stability of system, reducing the harmonic wave and undesired sound, and improving the wave form quality and the adaptation to load, etc.
Design of New Metal Detector
Authors: Fu Xiu Hui , Xu Lai Bao
Published: September 2011

Metal detector is used more and more widely in the modern social life, it acquires much attention because of its powerful detection capabilities. This article introduces the design and implementation of an intelligent metal detector which is based on TMS320LF-2407.Adopt giant magneto resistive (GMR) sensor with the type of AA006-02. Describe the hardware component, software design, working principle and main functions of the system in detail. The core of the whole contains the probe design and control circuits. The probe: oscillator circuit is constituted by the 555 timer, it provide the sine wave signal for the coil. The control circuits: the signal which is collect by the GMR sensor is processed by voltage amplifier and filtering circuit, the peak detection circuit and A / D conversion, The signal can accurately reflect the characteristic parameters of the received signal, stability, and can eliminate interference.Practice shows that this metal detector with the method can greatly reduce the malfunction rate on the base of meeting the sensitivity.
Improved Rotative Mid-Point Mensuration and Newton-Raphson Method in 2-D Flat Rolling Simulation
Authors: Song Shu Ni , Liu Jing Yi
Published: September 2011

Newton-Raphson (N-R) method has been employed to solve the system of simultaneous equations arising in Rigid-Plastic finite element simulation. The combination of the improved rotative mid-point mensuration and the N-R method, named the M-P method is designated to solve the equations of velocity increment in Rigid-Plastic FEM. The CPU times required for calculation by the M-P method and the N-R method are compared and it is found that the CPU time required for calculation of the N-R method is more than the M-P method. The calculated rolling forces by the M-P method and the N-R method are compared and it is found that the former correlates better with the measured value. Numerical tests and application show that the M-P method is feasible and steady.