bluuebunny/crossref_metadata_2025 huggingface dataset:
Micro-Hole Machined by Electrochemical Discharge Machining (ECDM) with High Speed Rotating Cathode
Authors: Huang Shao Fu , Zhu Di , Zeng Yong Bin , Wang Wei , Liu Yong
Published: July 2011

Electrochemical discharge machining (ECDM), based on electrochemical machining (ECM) and electrodischarge machining (EDM), is an unconventional micro-machining technology. In this paper, with the use of water, the process of micro hole on ANSI 304 stainless steel machined by micro-ECDM with high speed rotating cathode is studied. The effects of machining conditions such as the cathode rotating speed and cathode diameter on the surface quality and accuracy of the shape are investigated. The results indicate that a relatively higher electrode rotating speed can improve the machining accuracy of the micro-holes and reduce the electrodes wear.
Experimental Research on the Screening Efficiency of Particle Impact Drilling Separation System
Authors: Zhang Yang , Wang Bin Bin , Wang Yi Xiao
Published: July 2011

PID (Particle Impact Drilling) is a new drilling technology which has been developing in the near decades. Utilizing steel particles with high speed to impact the rock stratum, this technology could be used in hard terrane. Compared with ordinary drilling technologies, PID has many advantages, such as long service life, high drilling speed, and low duty cycle, etc. During the process of recycling and separating, the steel particles will inevitably encounter a part of loss. In order to keep the sum of steel particle and working efficiency, the loss rules should be intensively studied. Based on experimental studies, this paper mainly works on the screening efficiency under various conditions including volumetric flow rate of drilling fluid, viscosity and steel particle ratio, etc. It was found that the loss rate of steel particle would increase with the increasing volumetric flow rate, viscosity and steel particle ratio. Furthermore, dimensional analysis was employed to analysis the relationship between loss rate and these factors and one empirical formula was proposed.
An Improved Active Queue Management Algorithm Based on Nonlinear Smoothing
Authors: Zhang Jing Jun , Xu Wen Long , Wang Li Guo
Published: July 2011

According to the limitations of calculation of the original random early detection (RED) algorithm in linear packet loss rate. This paper proposes an improved algorithm which imposes nonlinear smooth for packet loss rate function of RED algorithm. The speed of growth of packet loss rate is relatively slow near the minimum threshold, while near the maximum threshold the speed of growth of packet loss rate is relatively faster. In this case, using the trend of the average queue length to dynamically adjust the parameters of the RED algorithm, it reduces the dependence on the parameters of the RED algorithm and enhances the stability of the algorithm. NS simulation shows that this algorithm has been significantly improved for packet loss rate, throughput and other performance.
Optimization of Chlorella pyrenoidosa Removal by Low Frequency Ultrasonic Irradiation Using Response Surface Design
Authors: Zhang Zhi , Liu Chao , Fan Gong Duan , Luo Jing , Wang Yan Dong
Published: July 2011

The control parameters of the removal ofChlorella pyrenoidosa, which was irradiated by low frequency ultrasonic, is optimized by using single factor experiments and response surface methodology (RSM). First of all, the approximate ranges of the ultrasonic frequency, the ultrasonic power and the irradiation time were estimated with single factor experiments for the further experiments. And then the optimized values of the three control parameters were determined, which were analyzed by using central composite design (CCD) and RSM. The results showed that the removal rate of chlorophyll-a could reach to 64.1% after the irradiation for 6.34min by using ultrasonic of 77.7 kHz and 250W. Ultrasonic technology can removeChlorella pyrenoidosacells in water quickly and effectively, so as to achieve the purpose of water purification.
Deformation Characteristics Research of Large Span Aqueduct under Impounding Conditions
Authors: Deng Hua Feng , Zhu Min , Guo Jing , Cheng Zhuang
Published: July 2011

Cao River aqueduct is the large-scale aqueduct that has been designed and constructed for the first time in China, for the great technical difficulties in structure form, there's no engineering experience or theoretical method for reference in domestic and abroad. Therefore, for mastering the stress characteristics and deformation law of aqueduct structure more overall and deeply, the impounding test of trial span was carried out before formal operation. Deformation characteristics of the aqueduct under impounding condition were analyzed in detail. The maximum deflection at mid-span of longitudinal beam was 0.98mm when three aqueducts all impound to 5.4m, the change range is small and in the allowable range of design and specification , which means the structure of aqueduct was reasonably designed and also provided important reference for the later operation and management.
Research on Ultra-High Cycle Fatigue Property of 45 Steel
Authors: Jin Ling Ling , Deng Cai Yan , Wang Dong Po , Tian Rui Ying
Published: July 2011

Fatigue property of 45 steel was studied in this paper with the method of ultrasonic fatigue testing, and SEM was used to analyze microscopic characteristics of the fatigue fracture. Fatigue test results show that: S-N curves descend continuously after 108 cycles, there is no fatigue limit as the traditional fatigue conception describes. Therefore, it is very dangerous to design welded structure working in the ultra-high cycle interval with the fatigue strength corresponding to 5×106 cycles. In the super-long life range, the fatigue property of welded joints is worse than the base metal. SEM analysis shows that: fatigue crack mainly initiates from the defects in the surface or sub-surface.
Mechanical Property of Friction Stir Welded Retardant Magnesium Alloy Joint
Authors: Tu Yi Min , Qiu Ran Feng , Shi Hong Xin , Zhang Xin , Zhang Ke Ke
Published: July 2011

In order to obtain better understanding of the friction stir weldability of the magnesium alloy and provide some foundational information for improving mechanical properties of retardant magnesium alloy joints. A retardant magnesium alloy was weld using the method of friction stir welding. The influence of welding parameters on the strength of the joint was investigated. The maximum strength of 230 MPa was obtained from the joint welded at the tool rotational speed of 1000 r/min and welding speed of 750 mm/min.
Research on Surface Cracks of Thin Slab
Authors: Wang Shuo Ming , Ji Dan Dan , Zhu Li Guang , Zhang Cai Jun , Liu Qing Gang
Published: July 2011

This paper probes into the reasons about surface crack on the SS400 steel through analyzing FTSC. The results show that: the surface crack is mainly produced by the high content inclusion in SS400 steel and the fluctuation of inclusion makes the mould flux have bad performance. The protective slag is not filled fully which worsens the condition of heat transfer and makes the solidified shell uneven, thus it is easy to produce crack in the normal forces. Secondly , the slag entrapment and high content of sulfur is the another reason . There are a lot of calcium-aluminate ,silicates, sulfides which have high melting point and low plasticity in crack inside and around and their content gravely deviates from normal state. The effect of inclusion to crack is three times than the slag entrapment and just as the slag entrapment to high sulfur content
Modeling and Simulation Study on the Complex Seepage Mechanism of Porous Electrode for a Proton Exchange Membrane Fuel Cell
Authors: He Hui , Sun Peng Tao , Xu You Sheng
Published: July 2011

In this paper, a three-dimensional, complex seepage model of a proton exchange membrane fuel cell (PEMFC) is studied, the corresponding finite element method and numerical simulation are given as well, where species transport, fluid flow, charge transport, heat transfer and electrochemical reaction in the PEMFC are simultaneously addressed. The domain to be studied includes porous gas diffusion layers, catalyst layers, gas channels, bipolar plates, and membrane. The fluid transportation phenomena arising in the whole fuel cell are described by the referred model, different physical parameters and source terms are reflected in different areas. The chemical components, flow characteristics and distributions of temperature in the 3-D space are obtained by resolving the seepage control equation system coupled with electrochemical equations. The induced methods and results can guide the optimal design of PEMFC.
Experimental Study of Heat Pipe Exchanger for High Power LED Cooling System
Authors: Gou Yu Jun , Liu Zhong Liang , Zhong Xiao Hui
Published: July 2011

A new cooling concept for high power LED by combining the heat release of high power LED with two-phase heat transfer heat pipes was proposed, and in this study a new type of heat pipe with specific fins structure was developed. Through experimental results, we found the new heat pipe heat exchanger has the features of high efficiency of heat dissipation and compact construction which meets the demand of heat dissipation for high power LED. We also found the heat dissipation performance of the HP heat exchanger changed with the work angle.
Effects of Temperature on the Impedance of PEM Fuel Cell
Authors: Liu Qian , Sun Hong , Jin Zheng Nan , Luan Li Hua
Published: July 2011

Electrochemical impedance (EI) plays a very important role on the characteristics of proton exchange membrane (PEM) fuel cell. In this paper, the effects of the cell temperature and the humidification temperature on the electrochemical impedance are analyzed by the equivalent circuit. The results show: when the cell temperature is higher than the gas humidification temperature, ohms impedance and Faraday impedance increase markedly, and electric double layer in the PEM fuel cell inclines to the specialty of capacitive reactance; the more than the cell temperature the gas humidification temperatures is, the more the extent of specialty of capacitive reactance the electric double layer shows. These results are very helpful to understand the operating principle of PEM fuel cell and improve its performance.
Effect of Thermal Load on Mechanical Properties of Ni/YSZ Anode Support Micro Tubular Solid Oxide Fuel Cell
Authors: Xu Ying Qiang , Wang Lei Lei , Zhang Qiong Wei
Published: July 2011

The most commonly used Micro tubular solid oxide fuel cell (MT-SOFC) anode material is a two phase nickel and yttria stabilized zirconia (Ni/YSZ) cermet. And the mechanical stability of anode support layer, in anode-supported electrolyte designs, is very important for large scale applications. During the assembly of stack and normal operation, MT-SOFC is easy to crack under the fuel pressure and thermal loading due to various mechanical properties. In this study, MT-SOFC model was founded on the background of MT-SOFC stack of electric vehicle and was analyzed by finite element method, based on theories of elasto-plasticity, thermo-mechanical coupling. The effect of thermal load was investigated. It concluded that the failure of the micro-tubular cell occurs mainly because of the residual stress due to the mismatch between the coefficients of thermal expansion of the materials of the electrode assembly. The results are important for studying the life and final spallation of MT-SOFC of electric vehicle.
Synthesis, Optoelectronic Properties of a New Photochromic Diarylethene Bearing Benzothienyl and Malononitrile Group
Authors: Fan Cong Bin , Pu Shou Zhi , Liu Wei Jun , Cui Shi Qiang
Published: July 2011

An unsymmetrical diarylethene derivative bearing both benzothienyl and thienyl moieties, in which a malononitrile group was substituted at the 5-position of the thienyl ring, was synthesized. This compound undergo a reversible electrocyclic rearrangement, generating strongly colored closed-ring isomer upon irradiation with UV-light which show nonfluorescence, while exposure to light in the visible range triggers the cycloreversion to the colorless open-ring form that exhibits strong fluorescence properties. This properties of molecular photochromism were developed that showed both photo switches and fluorescence switches. The erasable and rewritable photo-images on this photochromic diarylethene were successfully demonstrated. This developments are crucial for fundamental research and eventual technical application for high-density optical data storage.
Study on the Separation of Waste Polyester-Cotton Fiber with Dilute Acid
Authors: Kong Wei , Yu Yong Ling , Lv Li Hua
Published: July 2011

Process of the separation of waste polyester-cotton fiber with dilute hydrochloric acid was studied. Acid mass fraction, reaction time, reaction temperature and solid-liquid ratio were studied on the effect of separation with the method of Orthogonal experiment. The results showed that the priority order of the factors was reaction time > acid mass fraction > reaction temperature > solid-liquid ratio. The optimal conditions through serious research on such factors were: acid mass fraction 10%, solid-liquid ratio 4g/100ml, reaction temperature 95°Cand reaction time 90 minutes. Through the microscope, polyester and cotton fibers were separated completely in which polyester into fibrous and cotton fibers were hydrolyzed into tiny powder.
Research on In Situ Anionic Polymerization of PA6/PI Alloy
Authors: Zhao Hong Kai , Xiao Li Guang , Wang Hong Jie
Published: July 2011

High performance trend of plastics has become a hot spot of current research. Select bisphenol A dianhydride and bisphenol A diamine with excellent water resistance as the reactant monomers to obtain anhydride-terminated polyimide with very high molecular weight by two-step polymerization, graft the active radicals of acyl caprolactam using the activity of anhydride and obtain PI modified nylon resin by polymerization.When the system temperature is above 160 °C and the added modifiers are greater than 10%, the system viscosity increases very fast; when the system temperature reaches 140 °C and the added modifiers are at 5%, the system viscosity increases very slowly. It is proved that the reaction in each above step is successful through infrared analysis. The mechanical properties of modified PI nylon increases with the increase of consumption and molecular weight of polyimide, when the molecular weight is selected to be about 8000~10000 and the adding amount is 10wt%~15 wt%, the tensile strength reaches over 85MPa, the notch impact strength is increased to 19.6kJ.m-2 and the elongation at break reaches 18%, which are remarkably better than general engineering plastics.Through microscopic analysis, the molecules of polyimide does not enter crystallization phase of nylon resin, but forms compact lamellar crystals existing in nylon matrix.
Study on the Impact of Wind Load on Large Crawler Crane Typical Truss Structure
Authors: Jiang Tao , Xue Guang Yan , You Yi Ping
Published: July 2011

In order to satisfy the development trend of light-weighting design of large crawler crane, beginning with analysis of the influence of wind load on the performance of large crawler crane truss structure, the numerical simulation of the crawler crane typical truss structure is carried out by fluid dynamic analysis software. Under the limit working condition of wind blowing, the impacts of steady-state wind field and dynamic-state wind field to the performance of truss structure are calculated separately and the coupling effects of various rods of truss structure in the wind field are analyzed. The simulation and calculation results indicate that the wind load calculation method for the crane truss structure in the existing design criterion of crane truss structure is too conservative, which make the self-weight of the truss structures much bigger. Research results in the paper provide certain reference for the light-weighting design of large-scale crawler crane truss structure.
Consistency Assessment Method for Granular- Cement Paste Systems
Authors: Hoornahad H , Koenders E. A. B.
Published: July 2011

Fresh granular-pasty materials are considered as an intermediate class between solid and fluid. These materials are capable of showing their rheological behavior which can be close to either a pasty or granular system depending on properties and proportion of ingredients in the mixture. Therefore, quantification of such dependencies is a crucial factor in order to be able to predict the performance of this type of material. In this study a two phase model is considered in which a mixture is decomposed into a paste and a granular phase. The relation between the aggregate grading and the consistency of the mixture has been investigated for a concrete in which the pasty behavior is dominant. It was found that if the volume and property of the paste that remains after filling the space in between the aggregates in compacted state is kept constant, the consistency of a mixture can be characterized by the number of aggregates corresponding to each grain size regarding the sieve analysis test. The paper presents a modelling approach and experimental results.
The Research of Angle Measurement between Cone and Support Rods Located at ICF Target
Authors: Xu Xiao Jie , Dong Xi Yan
Published: July 2011

Aiming at the installation location measuring requirement of cone rod located at some kind of laser target for inertial confinement fusion, a non-contact five-coordinate measuring machine is exploited and built. According to the projection characteristic of spatial line, the mathematical model of spatial angle between the cone rod and support rod is established. Based on this projection method, the direction vector of cone rod centerline can be obtained by testing the cone rod from two perpendicular directions with CCD camera. LOG operator is applied to detect the edge of image. The experiments illustrate the measuring accuracy of angle can reach 0.1 degree with the projection method.
Numerical Simulation and Analysis of Hydraulic Excitation System Based on Water Hammer by the Method of Characteristics
Authors: Zhang Hui Xian , Kou Zi Ming , Wu Juan , Lu Chun Yue
Published: July 2011

To study artificially produced and actively controlled water hammer wave caused by hydraulic vibration exciter, a mathematical model was established and an experimental system was designed to verify it. Through the given partial differential equations, a computer code based on the method of characteristics was developed to calculate transient pressure distributed along the pipe under different rotational frequency of vibration exciter. The numerical simulation indicates that there is a simple harmonic vibration rising at the cross sections along the pipe, corresponding to different excitation pressure at every cross section. In addition, the excitation pressure can also be adjusted by system pressure via overflow valve. So, this work is expected to serve for the optimum design of the hydraulic excitation system and play a theoretical guiding role to experimental research in future.
Synthesis, Properties and Application in Optical Memory of a Photochromic Diarylethene Based on Benzene Ring
Authors: Liu Ming , Wang Ren Jie , Liu Gang
Published: July 2011

A new photochromic diarylethene compound, 1-(2-methyl-5-(2,4-difluorophenyl)-3-thienyl)-2-(2-cyanophenyl)perfluorocyclopentene (1a), was synthesized and its photochromism and photo-induced anisotropy was investigated. The results showed that this compound exhibited reversible photochromism, changing from colorless to purple after irradiation with UV light both in solution and in PMMA amorphous film. In hexane, the open-ring isomer of the diarylethene 1a exhibited relatively strong fluorescence at 459 nm when excited at 316 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring isomer showed weak fluorescence.
Recovery Methods of Germanium
Authors: Wang Wan Kun , Peng Jin Hui , Zhang Ze Biao
Published: July 2011

The paper overviewed the recovery methods of germanium, summarized the feature of those methods such as leaching with sulphuric acid, chlorination leaching- distillation, alkali decomposion, leaching with hydrofluoric acid, extracting, reduction and leaching germanium with microorganism. And introduced the principles ,technologies and disadvantages of those methods. Finally, prospected that microwave pretreatment technology and microwave directly leaching can be used in traditional methods such as acid leaching and alkali decomposion to improve the recovery rate of germanium by change insoluable germanium into soluble germanium and upgrade the leaching rate of germanium.
Effect of Oxygen Partial Pressure and Temperature on Liquidus for the CaO-SiO2-FeOx-Al2O3 System
Authors: Wang Nan , Zou Zong Shu , Zhang Zhan , Xiao Yan , Yang Yong
Published: July 2011

To provide essential data for an efficient utilization of vitrified bottom ash slag, the thermodynamic properties of the CaO-Al2O3-SiO2-FeOx-MgO-Na2O oxide system is highly required. As one of the related oxide subsystems, the equilibrium phase relations and liquidus of CaO-SiO2-FeOx-Al2O3 system is of great significance to interpret and predict the thermodynamic properties in multi-component oxide systems. In this paper, phase diagrams for the CaO-Al2O3-FeOx and SiO2-Al2O3-FeOx systems were calculated by using CALPHAD method with FactSage program. The liquid phase area changed with changing oxygen partial pressure from 1Pa to 10-3Pa and temperature from 1673K to 1773K. The equilibrium phase relations of CaO-Al2O3-FeOx and SiO2-Al2O3-FeOx systems were discussed.
On the Tensile Stress and Damage Accumulation during Equal Channel Angular Extrusion
Authors: Zhang Zhi Jian , Park Joong Kuen
Published: July 2011

The Cockcroft-Latham (CL) damage factor has been calculated, using FEM simulation, during equal channel angular extrusion (ECAE) of strain hardening materials. A high CL damage factor was predicted inside the billet and the damage was increased with the increasing strain hardening coefficient. This was closely related to a generation of increasingly high tensile stress in the deformation zone inside the billet due to an inhomogeneous deformation. The possibility of cracking inside the ECAE billets was confirmed in the ECAE processing of Ti-0.34O-0.95Fe and Ti-0.5Fe billets. The simulation further predicted that CL damage factor can be reduced by applying back pressure or friction force.
Study of the Multiaxial Fatigue Life Influencing Factors Based on the Critical Plane Approach
Authors: Lv Peng Min , Shi Chun Juan
Published: July 2011

The tension-torsion thin walled tube specimens were used as the researching object in this paper. The method of determination to the critical plane which has the maximum normal strain and maximum shear strain was expounded. The strain state on the critical plane under non-proportional loading was analyzed, and the unified prediction model was used to calculate the fatigue life. In order to research the influence of phase difference on fatigue life under the non-proportional loading, the relation of the equivalent strain and the phase difference in different positive strain amplitude and different strain amplitude ratio were analyzed. It’s found that the dangerous phase difference which has the shortest fatigue life is in direct relation with the strain amplitude ratio. The general formula of dangerous phase difference is presented. Through the material mechanics performance and fatigue parameters of uniaxial stress state, the coefficients in the formula can be obtained and the coefficients of 15 kinds of common materials are given for practical application.
Recycling of Fiber-Metal Laminates
Authors: Yang Yong Xiang , Zhu Guo Liang , Xiao Yan Ping
Published: July 2011

Fiber metal laminates provide superior mechanical properties over conventional metal alloys. However, they show a very poor recyclability due to its composite nature. Unique recycling technique is developed to recycle both the glass fiber and the aluminum alloy. The process consists of a thermal delamination and an alloy refining step. In this paper, two fiber metal laminates were presented for their thermal delamination behavior and metal recyclability: Lacomet and GLARE. The results indicate that the thermal delamination is robust and energy-efficient, and the aluminum alloy has very high recovery rate and can be used in its original applications. The recovered glass fiber can be re-used in similar or non-critical applications.
Na-Bentonite Anti-Seepage’s Ecological Technology and Ecological Effects in Urban River Bio-Remediation
Authors: Qi Qing Qing , Zhu Wei Rui
Published: July 2011

Bio-remediation of urban rivers is an important issue that has aroused extensive attention both at home and abroad. The ecological anti-seepage technology of Na-bentonite is becoming the most environment-friendly technologies. The ecological anti-seepage technology is stated and its the ecological effects is analyzed based on the principles of the eco-hydraulic engineering. The ecological effects is in a word, it is that river shapes naturalized, river channel sections diversificated, reiver bed anti-seepage naturalized, surface water and underground water connected, and interfering ecosystem minimized. It is showed that the ecological anti-seepage technology of the Na-bentonite is accord with the ecological hydraulic engineering principles perfectly and is worth making more spread rapidly.
The Influence of Seismic Motion Input Direction and Damping on the Dynamic Analysis of Mega Steel-Frame Structure
Authors: Xu Guo Lin , Bai Ya Shuang , Chen Wen Gang
Published: July 2011

A more accurate simulation of the response to the structure under seismic load action can be generated through taking bi-directional seismic motion input into consideration. The commonly used four calculation methods of bi-directional input are adopted in this paper to compare the different dynamic responses of mega steel-frame structure to seismic load action. The paper also provides a method for choosing Raleigh damping coefficients applicable to the dynamic analysis of mega steel-frame structure.
Microstructure and Fracture Behavior of Ceramic Particle Reinforced Composite Bond with the Assistance of Ultrasonic Waves
Authors: Zhang Yang , Qi Hai Bo , Zhu Hao
Published: July 2011

Composite materials (55 vol.% SiCp/A356) were brazed by filling with a Zn-based alloy with the assistance of ultrasonic waves. 37 vol.% SiC particles composite bonds were produced and their structural features as well as mechanical properties were obtained. The crack initiation and propagation behavior of the composite bonds were examined using in situ SEM and SEM fractographic observations. The shear strength of the brazed bonds containing ~37 vol.% SiC particles was 37% higher than the 55%SiCp/A356 composites and 48% higher than the un-reinforced bond. There are two mechanisms of crack initiation in metal matrix composite. In the first cracks may initiate at in the eutectic phase in the composite bond. In the second cracks may also initiate due to cracking of the particles.
Research of FWP Process Deformation Compensation Forecasting on the Basis of TS-FNN
Authors: Deng Yao Hua , Liu Gui Xiong , Liao Qing Fu , Zeng Lei , Wu Li Ming
Published: July 2011

After analyzing the influencing factors of flexible workpiece path(FWP) process deformation, this article proposes the basic conception of process deformation intelligent forecasting and compensation, start from the process modeling method of Takagi-Sugeno fuzzy neural network, to modify the classic FNN model and construct the multiple input/output TS-FNN model for FWP process control; with LMS law and steepest descent method, antecedent network membership function parameter adjustment and descent network parameter study method of TS-FNN model is deduced; finally to carry on comprehensive simulation on TS-FNN model, the result shows the constructed model is better than BP neural network and RBF neural network for an order of magnitude on predication accuracy; in the quilting process of flexible objects, compensated by TS-FNN, the path processing obtains good approaching effect, testing result indicates that the position error scope of quilting is from 0.078 to 0.162(mm), the accuracy is higher than excellence grade of quilting which refers to national standard FZ/T81005-2006.
Study on Earthquake Response Analysis of Reinforced Concrete Masonry Structure
Authors: Yang Hai Xu , Shen Tong , Yao Jian Gang
Published: July 2011

According to the analysis of a six-story reinforced concrete masonry building model with the methods of nonlinear time history analysis, the seismic performance of structure has been studied in this paper. The interstory shear-deformation and stiffness of linear elastic model is established. The availability of the analysis model, hysteretic model and relevant parameters adopted and the computation program developed are verified. The longitudinal deformation of structure is bigger than the lateral deformation under different earthquake waves, from this it can be showed that longitudinal seismic performance is smaller than lateral wall; for seven-story concrete block building with core-and tie-columns, the requirement of the seismic fortification intensity can be met. The analysis of this paper provides a reference for reinforced concrete block buildings.
Wireless Monitoring and Scheduling System of Urban Water Supply Network
Authors: Yu Ying , Luo Lu Qin , Lv Da Yong
Published: July 2011

Currently, data communications used in the monitoring and scheduling system of urban water supply network can be simply divided into wireless and wired. While the wireless data communications with network flexibility, less investment, easy maintenance, cost-effective advantages. Therefore, the wireless data communications has become a major data transmission in urban water supply scheduling. The wireless transmission of state parameters in urban water supply pipe network was studied in this paper. This paper presents a wireless monitoring and scheduling scheme based on the short message transmission technology in urban water supply network. It introduced the hardware components of the system, and wireless data transmission software.
Finite Element Optimization Design of the Drum of Storage Winch
Authors: Yu Kai An , Wang Yu Yu , Chen Ke Yu
Published: July 2011

In order to make the structure design of winch drum reasonable and reduce the gross mass of winch, the main components of storage winch were optimize designed on the premise of not affecting the safety use of storage winch. By applying the SoildWorks software, the storage winch model was established, and finite element analysis for the model was also carried out by Simulation. The maximum principal stress of drum under the most dangerous operation condition was obtained, and wall thickness of drum, web thickness, web position and hub thickness were all optimized. After the optimization analysis, it was found that the maximum stress on the drum decreased but then increased along with the increase of the wall thickness of drum. Meanwhile, the unreasonable structure was improved and the gross mass of drum of storage winch was reduced. Furthermore, the more reasonable structure design was achieved. The study provided important theoretical basis for the product design.
Simulation of Kinematic Movement for Invert Arch Floor of Plunge Pool with Numerical Manifold Method
Authors: Zhang Yang , Wu Ai Qing , Dong Zhi Hong
Published: July 2011

The invert arch floor of large plunge pool is composed of some discrete arch blocks divided by construction joints. The joint is only 1 mm wide. Under the uplift pressure, the mechanical behavior belongs to highly nonlinear problem, which is difficult to simulate by finite element method. Based on NMM (numerical manifold method), the kinematic motion process of the invert arch floor is simulated under the different uplift pressure. Calculation results show that: as the uplift pressure increasing, each arch block gradually rises, rotates, contacts with adjacent blocks and the expansion joint width between adjacent blocks reduces. When uplift pressure reaches 85Kpa, the mutation of expansion joint width emerges and the invert arch floor finishes self-lock process which indicating the invert arch floor start playing statically indeterminate role to keep stable. The bearing capacity of the floor is determined by concrete compressive strength and anchoring strength of two arch abutments.
A Novel CNC Grinding Method for Relief Surface Based on a CAM System
Authors: Yue Xiao Feng , Tang Fei , Li Shu Zhe , You Zhan Hua , Wang Xiao Hao
Published: July 2011

A novel algorithm for the ball-end mill relief using a five-axis computer numerical control (CNC) grinding machine and the simulation of the ball-end mill based on a CAM system is presented in this paper. In this study, In order to obtain an accurate normal relief angle, which is one of the key factors affecting tool cutting performance, a tool coordinate system based on the required relief angle and the cutting edge was established. Then, by the proposed tool coordinate system, an algorithm to determine the position between the grinding wheel and the tool is proposed, and then the relevant formulations are deduced. The coordinates of grinding point when the step of relief surface is grinded are calculated.Using the input data of a ball-end mill geometry, wheels geometry, wheel setting and machine setting, the NC code for machining will be generated. Then the code will be used as input to simulate the ball-end mill machining in 3 Dimension before real machining. The algorithm of ball-end mill relief can be authenticated by the 3D simulation system.
Wear and Mechanical Properties of Fe-28Al and Fe-28Al-10Ti Alloys
Authors: Li Jing , Zhao Jin Shan
Published: July 2011

Fe-28Al and Fe-28Al-10Ti alloys were prepared by mechanical alloying and hot pressed sintering. The mechanical properties and wear resistance were studied. The results show that Fe-28Al bulk material is mainly characterized by the low ordered B2 Fe3Al structure with some dispersed Al2O3 particles. The mechanical properties such as the hardness and strength of Fe-28Al-10Ti are significantly improved compared with Fe-28Al, which is attributed to the grain refinement and solid solution reinforcing with the addition of Ti element. The fracture mode is mainly the intergranular fracture. Fe-28Al-10Ti exhibits more excellent wear resistance than Fe-28Al, especially after long distance sliding wear test. There is difference in wear mechanisms of Fe-28Al and Fe-28Al-10Ti alloys. Under the load of 100N, there is obvious plastic deformation on the worn surface of Fe-28Al. Micro-crack and layer splitting occur on the surface of Fe-28Al. The main wear performance of Fe-28Al-10Ti is particle abrasion, the characteristics of which are micro cutting and micro furrows.
Design of Experiment, Approximate Model and Optimization of a Muzzle Brake
Authors: Jiang Kun , Wang Hao
Published: July 2011

The approximate model of the muzzle brake performance was set up and evaluated to simplify the analysis process. LHS(Latin Hypercube Sampling) and numerical simulation of inviscid muzzle flow field were applied to obtain some samples of the muzzle brake performance. The performance was weighted with the impact force on the muzzle brake. Then RSM(Response Surface Method) was adopted to get the approximate model of the muzzle brake performance to establish a mapping of muzzle brake shape parameters and the impact force. In the end GA(Genetic Algorithm) was applied to perform the optimization of the muzzle brake shape parameters with the approximate model.
The SINS Algorithm Simulation Based on GUI
Authors: Li Gui Zhen , Li Jie , Jiang Qiao , Liu Jun
Published: July 2011

SINS algorithm and its application have made rapid development. The application of hardware simulation of strap-down navigation algorithm consumes too highly and the research phase in the laboratory is difficult to achieve, so this paper adopts computer simulation to test the algorithm. This article firstly constructed a track simulator which provides the information of the inertia device (the force and angular velocity). The data gained from the simulator is the source of SINS algorithm. In this paper, a Graphical User Interface was designed .We can enter different parameters for different trajectory to test the Euler angle algorithm, direction cosine algorithm ,quaternion algorithm and rotary normal vector algorithm .This method is simple and flexible .
Research on Parametric Design of Customized Products Based on Database
Authors: Li Xue Mei , Yan Fan Zhang , Xu Kun
Published: July 2011

Mass Customization (MC) has already become a main production mode of enterprises. In this production mode, enterprises can meet the requirement of individuals at the same price and time of delivery as mass production did. Parametrical rapid design is the key technology in realizing MC. The paper proposed a parametric design method based on database system and Solidworks API function, applying VC++ and Access, a parametric design application system based on Solidworks is developed. As an example, this method is applied to bearing part product, and the method is verified
Discussion on the Modeling Design of New Times Table Lamp
Authors: Jiang Xiao Wei
Published: July 2011

Since the modeling design of table lamp is ignored for a long time, this paper analyzes the significance of modeling design of table lamp. In view of the existing design problems of traditional table lamp, this paper states the function of modeling design of table lamp, the color of table lamp, the shape and texture effect of table lamp, among them the function mainly expounds its using function and artistic function, the color emphasizes the harmonization, and the shape and texture effect indicates that it should be different according to the different target people. Furthermore, the Era characteristics of modeling design of table lamp are analyzed. At last, the corresponding summary is made.
Design and Research on New Type Fitness Washing Machine
Authors: Cheng Xian Chun , Jiang Xiao Wei , Liu Shao Jun
Published: July 2011

Since the fitness washing machine can combine the fitness movement with the housework, this paper analyzes the design purpose and meaning of fitness washing machine. In view of the design problem of the existing fitness washing machine, this paper designs a new type fitness washing machine and states the specific design scheme, related calculation and structure, application method and innovation points, among them the part of design methods mainly expounds the technical key points, technical index and transmission line, and the part of related calculation and structure mainly expounds the human calculations, design main parameter selection and washing machine connection part structure. Furthermore, the application method is introduced. At last, the innovation points have been pointed out.
Research on Brushless Permanent-Magnet DC Motor of Electric Scooter Based on Ansoft
Authors: Chen Qi Ping , Shu Hong Yu , Ren Kai , Peng Lai
Published: July 2011

In order to obtain good starting performance of the electric scooter driven by brushless permanent-magnet direct circuit motor(BLPMDCM)，modules of RMxprt and Maxwell 2D in Ansoft software are used to build finite element simulation model of BLPMDCM. We simulated and studied the basic features and starting process of BLPMDCM. The results of internal magnetic field distribution and dynamic performance simulation are obtained when the motors are in different positions. The results provide a theoretical basis to further optimize the design, improve the starting torque and reduce torque ripple for this new type of permanent magnet motor and its control system.
The Application of 2nd Derivative in NIR and MIR Micro-Imaging of Two Plastic Materials
Authors: Wang Dong , Ma Zhi Hong , Pan Li Gang , Han Ping , Zhao Liu , Li Xiao Ting , Wang Ji Hua
Published: July 2011

MIR/NIR micro-imaging can supply not only the spectra information but also the spacial distribution information, which is superior to the traditional MIR/NIR spectroscopy analysis. The definition of near/min-infrared micro-imaging is one of the important factors which will influence the correctness of imaging result. In this thesis, two kinds of plastic film which were similar to each other in appearance were regarded as the research object, of which the MIR and NIR micro-images were collected. The raw compare correlation images, 2ndderivative compare correlation images, raw chemimap images and 2ndderivative chemimap images of the MIR/NIR micro-images of the two materials were studied respectively. The result indicated that not only can the preprocessing of 2ndderivative enhance the discrimination of the spectra so as to enhance the image feature but also eliminate the nonuniformity of the compare correlation images. Both the MIR and NIR chemimap images will be inverted after the preprocessing of 2ndderivative. This study will, to some extent, provide some reference to the manufacturing process quality inspection and control and rapid discrimination of the safety of agricultural products and food packaging and the imaging methods of MIR/NIR micro-image.
Research on Defect Detection Technology of C/C Composite
Authors: Zhao Wei Guo , Dong Ji Hong , Li Wei , Wang Hai Ping , Guo Quan Feng
Published: July 2011

Carbon matrix/Carbon fibre reinforced composite(C/C composite) has many special characteristics such as high strength, high elastic modulus, high temperature resistance and ablation resistance. So it is used to manufacture rocket engine nozzle in aerospace filed. But its security will be seriously effected during rocket engine working due to the manufacturing defects. Based on analyzing defect types and structure characteristic of C/C composite, the ultrasonic and infrared testing methods on C/C composite are further studied in this thesis. And effective defect detection has been achieved.
Analysis of Aromatic Volatiles Utilizing a MEMS-Based Gas Chromatography Column
Authors: Su Yu Hao , Lee Chia Yen , Yang Ruey Jen
Published: July 2011

The purpose of this study is to propose and apply a MEMS-based gas chromatography (GC) device comprising a miniature serpentine column. A 2 m long, 200 μm wide and 250 μm deep column was fabricated using a wet etching process and bonded to a Pyrex cover plate. After the GC column was coated with Carbowax 20M as the stationary phase, the concentrations of benzene, toluene, Ethylbenzene and m-Xylene were successfully detected in the mixed sample. The leakage test and mixed gas separation test achieved a useful separation result for Ethylbenzene-Xylene and Benzene-Toluen mixture at a 17.1 cm/s linear flow rate in a GC chip column.
Application of Six Sigma Method in Improving the Quality of the Spiral Bevel Gear
Authors: Meng Li Li , Lu Chun Guang , Xi Xiao Yan , Zhao Hui Zhen
Published: July 2011

According to the quality problems in one gear enterprise, the DMAIC method which is the core application of the six sigma theory is used to improve the quality of the spiral bevel gear, and the quality data is analyzed by using Minitab software. Firstly, the quality problem is defined in accordance with the DMAIC procedures and the main reasons for quality problems in spiral bevel gears are determined. Secondly, measurement systems and process capability are analyzed. Then, we set a specific program for the improvements for the main causes of quality problems. Through the successful implementation of this project, the quality of spiral bevel gears is greatly improved, and the production cost is greatly reduced. The effect is very significant.
The Configuration and Evolution of Ti-Si-N Island on TiN(001) Surface: Ab Initio Study
Authors: Liu Xue Jie , Zhao Ling Ling , Ren Yuan , Westkaemper Engelbert , Tan Xin , Jia Hui Ling
Published: July 2011

In order to study the evolution of Ti-Si-N film growth, the total energies and absorption energies of the Ti-Si-N islands on TiN(001) surface and the activation energy of the configuration evolution have been calculated with the first principle method. Four configurations of Si-2Ti-2N island have been studied, which are a silicon atom in a 2Ti2N island (Si-in-2Ti2N), a silicon atom by a 2Ti2N island (Si-by-2Ti2N), a titanium atom by a 2N1Ti1Si island (Ti-by-2N1Ti1Si), and a nitrogen atom by a 2Ti1N1Si island (N-by-2Ti1N1Si), respectively. The investigation presents some results. In the growth process of Ti-Si-N film, (1) the Ti and N atoms bonding together to form islands and Si atoms staying outside of TiN islands will lead to the most stable configuration; (2) the Si atom tends to separate from TiN phase, but the configuration evolution is not very easy, the activation energy of the transition from Ti-by-2N1Ti1Si to Si-2Ti2N is about 1.94eV; (3) it shows a tendency for Si atoms to bond with N atoms, rather than with Ti atoms.
The Enhanced H2S Sensing Behavior of Ag-Doped Porous SnO2 Nanopowders Prepared by Template Method
Authors: Li Chao , Xue Hai Yan , Zhu You Qi , Wang Yu Ting
Published: July 2011

Ag-doped porous SnO2 nanopowders were synthesized via a facile glucan-assisted template method combined with subsequent calcinations. Morphology, crystal structure, and H2S gas sensing properties of pure and Ag-doped porous SnO2 nanopowders were investigated. In comparison with undoped SnO2 nanopowders, the Ag-doped porous SnO2 nanopowders demonstrated enhanced H2S sensing behavior with high sensitivity, short response and recovery time, relatively low response concentration of 50 ppm, and good selectivity. The dramatic improvement in H2S gas sensing characteristics was explained in terms of rapid gas diffusion onto the entire sensing surface due to the less-agglomerated and porous structure of SnO2 nanopowders and the catalytic effect of doped-Ag element. The main objective of this research is to develop a new method to introduce catalysts on gas-sensing materials with less-agglomerated and porous structure.
Synthesis of VO2(A) Nanostructures by a Hydrothermal Method and their Transition to VO2(M)
Authors: Zhong Ya Lan , Zhang Yi Fu , Liu Xin , Liu Xing Hai , Huang Chi , Li Hou Bin
Published: July 2011

VO2(A) nanobelts have been synthesized using V2O5, H2O2, ethanol, H2O as the starting materials through a facile hydrothermal method. The as-obtained products were characterized by X-ray powder diffraction (XRD), X-ray photoelecton spectroscopy (XPS), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Some parameters, such as, the reaction time, reaction temperature and the ratio of EtOH/H2O, have greatly influenced on the phases and morphologies of the final products. It was found that VO2(A) can be converted to VO2(M) at 700 °C for 2 h for the first time. Furthermore, the phase transition properties of VO2(A) and VO2(M) phases were respectively studied.
The Rockburst Experiment Usage of Similar Material and the Mechanism of the Energy Releasing
Authors: Li Jie , Qian Yue Hong , Li Da Peng
Published: July 2011

As one of the geological disasters, rockburst is often generated in underground engineering under excavation unloading conditions in high geostress areas. Taking advantage of the simulation test especially for the rock mass under high hydrostatic stress, the dynamic failure rockburst style resulted from instantaneous unloading in one direction was studied, whose peak velocity and acting time are analyzed. The results indicate that the formula for calculating peak velocity and the kinetic energy is proper and the kinetic energy is little portion of the recovery strain energy, most of which is dissipation in different ways; the unloading time at different positions apart from the free surface is nearly the same and more larger than the unloading wave’s disturbance time.