bluuebunny/crossref_metadata_2025 huggingface dataset:
Electron Transport of Right-Angle Graphene Nanoribbons
Authors: Li Hai Dong , Niu Jin Zhong
Published: July 2011

By the tight-binding method, we study the transport properties of right-angle L-shaped graphene nanoribbons. We found a universal conclusion is that the resonance of electron tunneling will present at the Dirac point when the system is metallic and the ribbons widths satisfy (NBAB=2NBZB-1). Further research suggests that the conductance resonance effect will be destroyed by impurity scatterer, especially the impurity concentration and strength are nontrivially large. We also found that antiresonance effect will result in a strong conductance suppression when the width difference () of the two ribbons is very big. In addition, when the system is semiconducting, the center of the well-defined insulating band can be easily tuned by a gate bias exerted on the armchair-edged graphene nanoribbon.
Martensitic Transformation in a Low-Alloy Ultra-High-Strength Steel
Authors: Qiao Zhi Xia , Zhang Dan Tian , Liu Yong Chang , Yan Ze Sheng
Published: July 2011

Martensitic transformation is the most important phase transformation strengthening the 30CrNi3MoV ultra-high-strength steel during heat treatment process. Characteristics of the martensitic transformation in the 30CrNi3MoV steel were investigated by means of dilatometric measurements and microstructural observations. The results showed that the starting and finishing martensitic transformation temperatures of the 30CrNi3MoV explored steel are 317°C and 167°C respectively, which are hardly influenced by the cooling rate from austenite region. Such a wide temperature range of martensitic transformation in the 30CrNi3MoV steel results into the diversity of martensite microstructures. The microstructures in all the quenched 30CrNi3MoV samples are composed of mixture of lath and acicular martensite, corresponding to low-carbon and high-carbon martensite respectively. The transformation rate of acicular martensite is much slower than that of lath martensite, which can be attributed to the stabilization of the rest high-carbon austenite after the formation of lath martensite.
Structure Characterization of Mg-Al Spinel Synthesized from Industrial Waste
Authors: Luo Xu Dong , Qu Dian Li , Zhang Guo Dong , Liu Hai Xiao
Published: July 2011

Mg-Al spinel has been synthesized by using industrial waste from ferroalloy plant, decomposed magnesite and used MgO-C brick as the main raw materials. The influence of decomposed magnesite and used MgO-C brick addition on crystalline structure, micro-morphology and properties of synthesized Mg-Al spinel are discussed. The synthesized product was characterized by XRD and SEM, and the crystallinity of each crystalline phase is calculated by relevant analytical software such as X'Pert plus and so on. The experimental result show the crystalline phase periclase increase with the increasing of decomposed magnesite and used MgO-C brick powder. The crystallinity of crystalline phase is highest when the addition of decomposed magnesite is 40wt%. Activity magnesia generated by decomposed magnesite powder decomposition has helped to improve the crystallinity of Crystalline phase. The energy provided by oxidization of the residual carbon promotes Mg-Al spinel grain growth.
α–Pinene Isomerization Catalyzed by a Nanometer Solid Superacid
Authors: Wu Chun Hua , Zhao Qian Rong , Zhang Jia Yan , Zhu Dan Dan , Du Guan Ben
Published: July 2011

Nanometer composite S2O82-/SnO2-TiO2, a novel solid superacid, was prepared by the sol-gel method and its structure was characterized by XRD, TEM, FT-IR and nitrogen adsorption. Results indicated that the composite S2O82-/SnO2-TiO2 had a narrow particle size distribution with an average particle diameter about 15~20nm. S2O82- combined with SnO2-TiO2 resulted in formation of strong acid sites on the surfaces. The surface area of catalysts obviously increased after incorporating SnO2. Nanometer S2O82-/ SnO2-TiO2 composite was used as a catalyst for a-pinene isomerization and the influence of catalyst preparation conditions on its performances were investigated. The optimum condition for superacid catalyst preparation was found to be with 2:1 Sn/Ti mole ratio, S2O82- 1 mol · L-1 of impregnation consideration and toasting temperature of 773K. With 3% of S2O82-/SnO2- TiO2 catalyst dosage at a reaction temperature at 403K for 2 h, the conversion of a-pinene was 98 % and the selectivity to camphene was 62 %.
Preparation of Controlled Microporous High Speed Steel and its Composite Self-Lubrication Materials
Authors: Wang Yan Jun , Yang Li Ying , Wang Bin , Wang Shou Ren
Published: July 2011

High speed steel (HSS) with controlled micropores was prepared via vacuum sintering process, using the mixture of stearic acid, TiH2 and CaCO3 compound as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preform with 60Pb40Sn40-15Ag-0.5RE solid lubricants to create self-lubrication composite where both solid lubricant phase and matrix phase were interpenetrating throughout the microstructure. Effects of pore-forming agent on micropore structure and porosity of the prepared microporous HSS preforms were investigated. The scanning electron microscope (SEM) observation was applied to the test samples and it revealed that the micropores of the microporous materials exhibited a uniform distribution and the apertures were of almost same size in principle. The friction and wear behaviors of the composite sliding against ZrO2 ceramic under a load of 50 N at 600 °C were investigated using a pin-on-disk wear tester and the results showed that this kind composite possessed excellent high temperature self-lubrication properties.
Analysis of Forward Spinning for Aluminium Alloy Tube
Authors: Mei Ying , Liu Bo , Niu Zhao Bo , Zhang Chen Ai
Published: July 2011

In order to obtain actual preferred principle of processing parameter about three-roller forward spinning of aluminium alloy tube, take the aluminium alloy tube that spun by Jiangyang chemical plant as a research object, based on nonlinear FEA software ANSYS/LS-DYNA, carried on 3D dynamic simulation, spinning force and stress-strain analysis to three-roller forward spinning of aluminium alloy tube under different processing parameter. Analysis results indicate: When feeds of spinning roller take 0.66mm/r~1.58mm/r(except 0.97mm/r), spinning force, component forces of spinning force, stress and strain have minimal change. Rounded angle radius of spinning roller should be greater than 60% and less than 125% blank thickness of aluminium alloy tube. Forming angle of spinning roller should take 22°~24°. Diameter of spinning roller should take 220mm~240mm. The conclusion has important meaning to further studies and actual manufacture about three-roller forward spinning of aluminium alloy tube.
On Formability of MoNiCr Alloy
Authors: Novy Zbysek , Džugan Jan , Motycka Petr , Podany Pavel , Dlouhy Jaromir
Published: July 2011

The paper deals with recrystallization conditions monitoring for MoNiCr nickel superalloy. The alloy is determined for modern concepts of nuclear reactors in which molten fluoride salts are used in the primary and/or secondary circuit as coolants. It represents a material with high corrosion resistance against fluoride salts and it has very good creep properties in the temperature range of interest for such a kind of reactors between 650 – 800 °C as well. The manufacture of vessels and fittings from MoNiCr alloy requires appropriate forming technology for this high-alloyed material. The key moment seems to be forming of the material cast state to the state of cast recrystallized microstructure with a homogenous fine grains. A kind of stress condition is besides temperature very important in the course of a hot forming of this type of hardly deformable materials. Forming with prevailing pressure state of stress increases probability that material can attain level of deformation allowing recovery and recrystallization processes without the material failure. Preceding cold deformation can essentially accelerate the recrystallization process. Investigation of forming condition influence on MoNiCr microstructure and thus its formability is performed here.
Dynamic Instability of Spatial Structures under Typical Wind Flow
Authors: Huang You Qin , Fu Ji Yang
Published: July 2011

The mechanism of dynamic instability of large span spatial structures under high wind speed should be studied carefully, but it has seldom been done before. In this paper, a double-layer cylindrical reticulated shell under a typical wind flow is taken as an example to study the dynamic instability of large span spatial structures under wind flows. The interaction of the shell and the flow is ignored and unsteady wind forces on the shell are obtained from wind tunnel tests. The dynamic instability status of the shell is determined by the Budiansky-Roth criterion. The results show that the double-layer cylindrical reticulated shell will become dynamically instable under high wind speed.
A Steering Wheel System and Controller for the Driving Simulator
Authors: Xie Ming Xiang , Wei Yan Ding , Zhou Xiao Jun , Wei Chun Yu , Tang Fang , Li Pei Xin
Published: July 2011

In driving simulator, the driver manipulating the steering wheel can not only be feeling authentic as the real vehicle but also get additional information of the vehicle state and road conditions. For this purpose, a steeling wheel system was detailed designed. A bicycle model was used to analyze the dynamic behaviour of a simplified four-wheel vehicle model and applied to compute the reaction torque. After modeling the steering column and the feedback motor, the state equation of the steering wheel was deduced. The control without PID, with ordinary PID and RBF network PID were adopted to control the feedback motor to generate desired torque. Simulation in matlab/simulink shows that the steering wheel has good performance and the RBF network PID controller has better performance and can satisfy the requirement of the reaction torque. This study will be a guide research for future driving simulator.
The Study and Realization of Online Submission and Peer Review System Based on AOP
Authors: Zhang Jing Jun , Wang Lei , Li Hui , Liu Guang Yuan
Published: July 2011

Aspect-Oriented Programming (AOP) is a new programming technology. It compensates the weakness of Object-Oriented Programming (OOP) at applying common behavior that spans multiple non-related object models. Interceptor adopts the logos of AOP and uses a way of hot swap solving these problems. At this issue, we research the AOP technology of Java Web called Struts interceptor. We show the advantage of this new programming method through an online submission and review system which using AOP method in the authentication and authorization.
Role of Shear Strain for a General Modeling of Magnetostrictive Film-Substrate System
Authors: Li Ming , Zheng Hui Ming
Published: July 2011

An approximate approach was presented to investigate the role of shear strain in calculation deflection of a magnetostrictive thick film-substrate plate-type system. Under provided assumptions, the present model can be reduced as the previous models including thin film,long thick film with both free ends.The obtained results shows shear strain plays an important role in calculation for short and wide cantilever specimen. It is also confirmed that the present model provides a general method of calculating deflection of a film-substrate cantilever system.
Different Management Goal of the Coal Enterprise Marketing Strategy
Authors: Bao Huai Qian , Wang Chang Tian , Zhang Ning
Published: July 2011

The demands of the consumers’ have always been diverse, and such different needs have attracted business-to-product updates desire. Thus the difference needs of enterprise product to meet the objective requirements of consumer demand. Only accurately identify the objective requirements can they established the right marketing strategy to seek competitive advantage and long-term interests for the company.
Study on Fast-Releasing Calcium Phosphate Cement for Accelerating the Release of Antibiotic
Authors: Li Mao Hong , Qu Shu Xin , Yao Ning , Wang Yu Suo , Zhao Ju Mei , Li Guo Qing
Published: July 2011

The long-retention of antibiotics in Calcium Phosphate Cement (CPC) may induce the development of drug resistance. Fast-releasing CPC containing antibiotics (FRCPC) was proposed as a solution to this problem and studied in this work. The FRCPC containing different proportions of soluble component were prepared and characterized. The setting time, compressive strength, degree of the conversion,in vitroantibiotic release and fracture surface morphology of FRCPC were studied. The results showed that the setting time increased, the compressive strength decreased, the in vitro antibiotic release accelerated with increasing fraction of soluble component in FRCPC. The setting time and compressive strength of FRCPC containing 20 wt% soluble components were close to the requirements of clinical applications, and thein vitrorelease was completed within 7 d. These results mentioned above showed that the FRCPC with suitable proportions of soluble components may prevent the development of drug resistance and may find applications in clinics.
Effect of Ar-N2 Mixed Gas on Morphology and Microstructure of Type 316L Stainless Steel TIG Weld Metal
Authors: Tseng Kuang Hung , Hsien Kai Chieh
Published: July 2011

The aim of the present work was to investigate the effects of specific nitrogen gas additions to argon shielding gas on morphology and microstructure of austenitic stainless steel TIG welds. An autogenous TIG welding process was applied on type 316L stainless steel to produce a bead-on-plate weld. The ferrite content of weld metal was measured using a Feritscope. The results indicated that the arc voltage increase as the amount of nitrogen gas added to the argon atmosphere increases. The retained ferrite content of type 316L stainless steel TIG weld metal decreased rapidly as nitrogen gas addition to the argon shielding gas was increased.
Study on Seismic Performance of Single Pylon Cable-Stayed Bridge at High Intensity Seismic Region
Authors: Hu Da Lin , Zhang Yong Wang , Chen Feng , Chen Long Gang
Published: July 2011

Seismic design of long-span single pylon cable-stayed bridge at high intensity seismic region has been a difficult issue for designers. There is few references in this aspect at present. Based on the research achievements and the engineering background of a single pylon cable-stayed bridge at high intensity seismic region of East China, a full bridge model is established to analyze dynamic characteristics and seismic responses of the structure. According to the characteristics of excessive displacements of the pylons and main beams and greater plastic deformations of the pylons and the piers when the bridge is under strong earthquake, the damping effect of viscous dampers on the bridge is discussed. The results show that it is necessary to take measures to absorb seismic shocks. The results of this study can be as a reference for seismic design of similar bridges.
Researches on the Treatment of the Row Hemp
Authors: Jiang Yan , Wang Ye Hong , Jiang Li
Published: July 2011

The length of a single fiber of hemp is 18mm or so, which is somewhat lower than that of flax. So it is possible to make the spun yarn with hemp. For the sake of high 7%~8% content of lignin in row fiber, even worse, it can not drop under the degree of 0.8% when treated by classical boiling off. That’s why the coarse stiff hemp fiber can not ever answer the demand of its spun yarn processing. The so called non-acid re-double-boiling out process developed on the renovation to the classic chemical boiling off of raw hemp can prevent the lignin from further fasculation under the inorganic acid preparation. At the same time, the OH— boiling off agent and HS— boiling off agent can cause a rapid thorough hydrolization of lignin, this undoubtedly will ensure the being of high quality refined dry hemp.
Effects of the Velocity of Ink Distributing Roller on Ink Tack Value
Authors: Yang Yong Gang , Hu Shu Hua , Liu Fu Ping
Published: July 2011

In order to find out the variation law of ink tack during the printing, the ink tack value under 9 different linear velocities of ink distributing roller was tested with an electric ink tack-o-meter in this article, and the relation equations between tack value and the roller linear velocity were built up. The study results showed that the higher the linear speed was, the larger the tack value was, and it would stay in a relatively high tack value (regarded as infinite tack value). At the same time, the relationships between ink tack and the roller linear velocity was different for various inks, so did the infinite tack value.
Synthesis of NiCr Nano Oxides as Anode Electrocatalysts for Direct Methanol Fuel Cell
Authors: Ren Chen Hong , Gu Ying Ying , Guo Zhi Wei , Feng Kai
Published: July 2011

NiCr nano oxides have been synthesized by impregnation method and were used as the anode electrocatalysts for direct methanol fuel cell(DMFC). The catalysts were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The activity of catalysts with different metal molar ratios and calcination temperatures on the methanol oxidation reaction were investigated by cyclic voltammetry(CV) and bulk electrolysis with coulometry. The results show that the NiCr nano oxides calcined at 500°C for 6h gave an excellent electrocatalytic performance in the anodic oxidation of methanol.
Research Progress of Stress Superimposing Method for Residual Stress Determination
Authors: Xue Huan , Li Rong Feng , Ge Rui , Zhu Hong Chuan , Peng Wen Jie
Published: July 2011

The stress superimposing testing method of residual stress is different from the stress releasing way. A new stress field is introduced adding on the initial state. The residual stress is indentified by the strain increment differences of the material detected in the stress superimposing process. The traditional stress superimposing testing method including hardness and indentation method are reviewed. The principle and application of two new type of stress superimposing testing methods of residual stress are introduced, their disadvantages are also indicated.
Acoustic Property Prediction of an Automobile Air Filter with Acoustical BEM
Authors: Xu Hai Qing , Zhou Hong , Jin Chang
Published: July 2011

In this paper, we use Acoustical BEM to predict the muffling effect of an air filter improvement with Helmholtz resonator of a domestic commercial vehicle. The result shows that the method works at some frequency range, which means there is a peak value of transmission loss close to the wanted frequency. And the position of the Helmholtz resonator is optimized.
The Investigation of the Influence of Dynamics Parameters on the Friction-Induced Self-Excited Vibration
Authors: Meng Xian Jie
Published: July 2011

A one degree of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction is built firstly, the numerical method is taken to study the impacts of dynamics parameters on self-excited vibration. The calculation result shows that Along with the variation of system dynamics parameters such as initial velocity or normal pressure the self-excite vibration has the weakened trend or the enhanced trend, so the self-excite vibration could be controled through the control of dynamics parameters.
Effect of Pre-Strain and Roller Working on Torsional Fatigue Properties of a Structural Steel
Authors: Zhou Cong Ling
Published: July 2011

In this study, fatigue tests have been performed using two kinds of specimens made of 25 steel. One is pre-strained specimen with pre-strain ratio changing from 2% to 8% by tension, the other is roller worked with deformation of 0.5 mm and 1.0 mm in diameter direction. In the case of pre-strained specimen, the fatigue limit increases according to increase of tensile pre-strain, the fatigue limit of 8% pre-strained specimen is 25% higher than that of non-pre-strained one; in the case of roller worked specimen, the fatigue limit of R05 and R10 is 126% and 143% to that of non-roller worked specimen, respectively. These remarkable improvements of fatigue limit would be caused by the existence of compressive residual stress, work-hardening and the elongated microscopic structures.
The Research of the Influence of Damping on Automonile Brake Groan
Authors: Meng Xian Jie , Li Jun Wei
Published: July 2011

A two degrees of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction of brake disk and pads is built firstly, the numerical method is taken to study the impacts of damping on automobile brake groan. The calculation result shows that the variation of damping coefficient and has different influence on automobile brake groan. and all have A critical value, when damping coefficient greater or less than the critical value the brake disk and pad possess the different vibration state respectively.
Potential Routes for Recycling and Reuse of Silicon Kerf
Authors: Xiao Yan Ping , Yang Yong Xiang
Published: July 2011

In photovoltaic industry during wafer sawing significant amount of solar grade silicon is getting lost into sawing slurry. In the present paper, potential approach and routes for recycling and reuse of silicon wafer sawing slurry are explored. Various techniques were used including distillation, heavy liquid separation, acid leaching and high temperature processing. After distillation, the polyethylene glycol (PEG) can be separated and reused as lubricant. By dissolving silicon at high temperatures from the kerf into a clean molten pool of silicon metal or scrap, or into an alloying metal like Cu, SiC can also be separated and recovered. Depending on the impurity level, solar grade silicon can be finally produced from this waste stream in combination with necessary refining treatment for the applications in the PV industry. Furthermore, converting the kerf into SiC or Si3N4 particles as technical ceramic products is also explored. It is expected that the present research can pave a way to develop a total recycling route for an optimum use of this resource, and to minimize the environmental risk of the waste disposal.
An Approach to Real Exhibition of the Yarn Texture in the Simulation of the Fabric Appearance
Authors: Tong Xiao Su
Published: July 2011

luster is an important surface property of the fabric material. Even if the same weave and color of the fabrics, the different appearances could be exhibited when the fabrics are made from different materials. In this paper, we analyzed the different characteristics of pictures taken from real yarns made from different fibers (mainly cotton, bast, silk and wool), and extracted the brightness distribution properties of the pictures. For the yarn luster is highly dependent on the material, we used the method of Shepard interpolation to fit the brightness characteristics of the yarns, so as to set up the specific fitting function. Such fitting function was used to simulate the real texture of the yarn. At the same time, we use the factor of elliptic lighting model to revise the yarn brightness in the fabric. Experiment results show that the method deduced in this paper could exhibit the different appearances of the yarns, and obtain a relative real simulation of the fabric.
AR Bispectrum Characteristics of Block Forming Machine’s Vibration Driven by Hydraulic Exciter
Authors: Zhuang Jin Song , Huang Yi Jian , Wu Fu Sen
Published: July 2011

Block forming machine, as a kind of automatic equipments, can quickly compact blocks. Higher-order spectrum analysis emerges as a new effective method in signal processing, which can describe nonlinear coupling, restrain Gaussian noise and reserve phase components. In the paper, a hydraulic exciter applying to block forming machine will be introduced. Then block forming machine’s random vibration signals during the compacting process would be collected, in order to make use of the sample data to build up a time series autoregressive model and bispectrum of three-order accumulation, to analyze AR bispectrum characteristics of the machine’s vibrate signals under different work conditions.
Study on Seismic Response Reduction of a Long-Span Cable-Stayed Bridge by Adding Viscous Dampers at the Different Positions
Authors: Li Zi Qi , Fan Yan Yan
Published: July 2011

Bridge is an important part of transport system, especially for the long-span bridges of important route. And it belongs to the lifeline project. It is an important measure for reducing the secondary disaster to ensure bridge’s normality in traffic after the earthquake. Currently, the isolation seismic design of long-span bridges with the special structure is used to reduce damage of bridges by the reason of the earthquake. Based on damping principle of the viscous dampers, the calculation and analysis of what the effect of shock absorption done by damper in decorate position of long-span cable-stayed bridge to structure of bridges are formulated in this paper.
Synthesis，Properties and Application in Optical Memory of a Novel Photochromic Diarylethene Bearing a Six-Membered Aryl Unit
Authors: Tong Zhi Peng , Liu Gang , Cui Shi Qiang , Liu Wei Jun
Published: July 2011

A new unsymmetrical photochromic diarylethene 1-(2-ethyl-3-benzothienyl)-2-[2-octyl-5-formyl-3-thienyl]perfluorocyclopentene (1a) has been synthesized. Its photochromic properties in solution and PMMA film were investigated. Diarylethene 1a changed the color from colorless to blue upon irradiation with 297 nm UV light, in which absorption maxima were observed at 581 nm in hexane and at 582 nm in PMMA film, The results demonstrated that it can be potentially used as polarization holographic optical recording medium.
Simulation of the Temperature Distribution of Gradient Ti-TiB Composites Prepared by Spark Plasma Sintering Process
Authors: Wei Sai , Zhang Zhao Hui , Shen Xiang Bo , Wang Fu Chi , Li Shu Kui
Published: July 2011

An electrical – thermal coupled finite element model (FEM) is developed to investigate the temperature distribution during spark plasma sintering (SPS) with a pre-designed graded graphite die. The sample used in this investigation consists of five layers with different contents of Ti and TiB (45 wt % Ti, 55 wt %Ti, 65 wt % Ti, 75 wt % Ti and 85 wt % Ti). The temperature distribution in gradient Ti-TiB composites was obtained. Owing to the use of the die with changing cross section, a temperature difference of 142K in the axial direction inside the sample is achieved, while the maximum radial temperature difference is 6.2 times less than the axial one.
Broadband Tunable Infrared Source and its Harmonic Generation
Authors: Wei Peng Fei
Published: July 2011

A self-built broadband tunable infrared source is introduced here, and its notable merits are all-optical and high-conversion-efficiency. This infrared source contains an internal signal seed and two noncollinear optical parametric amplifiers. Based on this infrared source, we demonstrate the high harmonic generation from the different atomic and molecular gases using the different driving wavelengths. These results indicate that such system is ideally suited to be used as a tunable source for the laser processing and the physical science.
Dissimilar Laser Welding of Ti-6Al-4V to Ti-6Al-6V-2Sn
Authors: Chiu C. Y. , Lu M.Y. , Tsay L.W.
Published: July 2011

Notched tensile strength (NTS) of the Ti-6Al-4V (Ti-6-4) to Ti-6A16V-2Sn (Ti-6-6-2) dissimilar laser welds were determined, which had been subjected to post-weld heat treatment (PWHT) over the temperature range of 482-704°C. The results indicated for the weld with the PWHT at 482°C the fusion zone (FZ) and heat-affected zone (HAZ) showed a peak hardness, as compared with other welds at the counterpart regions, whereas, the weld with the PWHT at 704°C had the lowest hardness among the welds. In all the welds, the FZ of the weld subjected to PWHT at 482°C possessed the lowest NTS, while the as-welded and the weld with PWHT at 704°C had superior NTS to others. The presence of grain boundary α, which promoted grain boundary shear, accounted for the typical features of mainly transgranular fracture with intergranular dimples of the welds.
Parametric Study on Fatigue Life Design of Shaft with Holes
Authors: Wang Xing Guo , Li Ran , Sun Wei , Hyde Thomas H.
Published: July 2011

The prevention of fatigue failure is an important consideration in the design of aeroengine shafts. In this paper, based on the elastic and elstic-plastic finite element analyses, for a series of small-scale hollow shafts with transverse holes, the maximum princple stress and von Mises stresss around the hole have been obtained. Hence, using McDiarmid and Von Mises criteria, the fatigue crack initiation site and life can be determined. The hoop stress, which is the driving force for the Mode I growth of short cracks initiated around the hole, has been characterised as well.
Synthesis and Characterization of Highly Cross-Link Polysiloxane Based on 2,4,6,8- Tetramethyl-2,4,6,8- Tetravinylcyclotetrasiloxane
Authors: Looi Yien Tyng , Ramli Rafiza , Othman Muhammad Bisyrul Hafi , Ahmad Zulkifli
Published: July 2011

A series of hydrosilyl-terminated polydimethyl-siloxane (HTP) of different molecular weight was cross-linked with 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl-cyclotetra siloxane (D4V) to afford a three dimension cross-link network. They were systematically synthesised through acid-catalyzed ring opening polymerization of octamethyl-cyclotetrasiloxane (D4) followed by hydrosilylation reaction using Platinum complex catalyst. Chemical structure of HTP was characterized using FTIR and H-NMR. Mechanical properties were established using Shore A hardness which were closely related to the cross-link density.
Study on Laser Welding Technology of Diamond Core Drill Bit
Authors: Sun Zhong Qiang , Jiang Zhong An , Wang Li Wei , Yu Tao
Published: July 2011

Comparing with the traditional welding technology, laser welding of the diamond core drill bit has much merit that easy to realize automatic control and the production efficiency is high. It is the important direction of originality innovation on the diamond tool. Aim at the characteristics that more specification, higher accuracy and bad welding of diamond core drill bit, the laser welding technology was designed by “uniform design”. The technological parameter of experiment was presented by uniform design software and abundant experience. The experiments show that the welding seam is smooth and the flexural strength is 2000 N/mm2 which is higher as the European Designing Standard for the same product, and it is better than others in reliability safety and stabilization, when the welding speed is 1600 mm/min and the welding power is 1700 W. The study has significance of guiding and reference to the industrial production of diamond core drill bit.
Research of Stress and Deformation Distributions in Central Incisors Restored with Different Glass Fiber Post Types
Authors: Huang Zhi Xin , Qian Cai Fu , Liu Peng , Deng Xu Liang , Cai Qing , Yang Xiao Ping
Published: July 2011

Three-dimensional digital oral treatment technology based on anatomical features of jaw bone and teeth was applied for modeling. Three dimensional finite element models for the restorative systems with straight glass fiber post, screw glass fiber post and one-piece glass fiber post-and-core were established. Stress and deformation under external bite force were calculated and compared among different post types. Comparing the maximum von Mises equivalent stress in the whole restorative system for the straight post, the screw post and the one-piece glass fiber post-and-core finds that the one-piece glass fiber post-and-core is effective to lower the maximum stress and obtain uniform stress distribution of the teeth. Even in each part of the restorative system like post, crown and root, the maximum stress in the case of one-piece glass fiber post-and-core is still lowest. Using one-piece glass fiber post-and-core, the overall deformation of the restorative system is decreased greatly.
Simulative Analysis for Reinforced Concrete Face Rockfill Dam of Qianqiao Reservoir
Authors: Ji Dong Yu , Ma Wen Liang
Published: July 2011

In this paper, finite element simulative analysis is proceeded for reinforced concrete face rockfill dam of Qianqiao reservoir. Deducing variation law of the dam’s stress and displacement in construction process and operational process. The analytic results are shown：reinforced concrete face rockfill dam of Qianqiao reservoir is reasonable structure, and every index meets the requirements for design.
Blast Pressure Analysis of a Pressure Vessel
Authors: Yu Shao Rong , Yin Yi Hui , Xu Bing
Published: July 2011

The sensitivity of blast pressure of a pressure vessel to the material strength, the effective welding depth and the relative radius is studied by finite element simulations and single-factor sensitivity analyses. And the sensitivity coefficients are obtained by normalization procession. Furthermore, a three-factor regression model is obtained by multi-factor numerical experiments. The investigation of this paper provides guidelines for further researches of relating problems.
Concurrent Design of the Petroleum Drilling Machine Based on PDM Platform
Authors: Sun Yan Ping , Bao Ze Fu , Wu Chun Yan , Kang Xiao Qing , Sun Wen
Published: July 2011

Through to the petroleum drilling machine serial design pattern malpractice's analysis, this article proposed petroleum drilling machine's concurrent design uses in the petroleum drilling machine enterprise based on PDM the platform. Elaborated the concurrent design in the petroleum drilling machine production process's application, analyzed PDM and the concurrent design relational model as well as PDM and the petroleum drilling machine's concurrent design key technologies.
Optimum Design Study of Hydraulic Hatch Cover on Buckling Strength
Authors: Zhang Yu Lian , Zhang Hai
Published: July 2011

The hydraulic hatch cover is used to seal rainwater and to carry container and weather loads. The method of optimization theory based on dual method has been transplanted to optimize hatch cover structure in the present paper, and the numerical calculation model of hatch cover structure was established. The target function is the structure gravity of hatch cover, there are three kinds of constraints: yielding strength, rigidity and buckling strength. The hydraulic hatch cover has been optimized under multiple loads, the numerical calculation results meet the design requirements.
The Monitoring System of the Hoister Based on Virtual Instrument
Authors: Yang Jun
Published: July 2011

In order to increase the safety and reliability of hoister in operation, this paper studies a new monitoring system for mine hoister, and G programming language is used on the LabVIEW tool platform, emphatically introduces the main function and characteristics of the system. Due to the superiority of the virtual instrument technology, the system can achieves the hoister’s position, velocity and so on, also the data analysis are achieved conveniently. The system has the advantages of simply operation, friendly interface and powerful adapting.
An Accurate Exposure Time Measurement Method of CCD Cameras
Authors: Luo Hong E , Gu Jin Liang , Chen Ping , Xia Yan , Li Bao Ming
Published: July 2011

In the shadow photograph system in ballistics range, the exposure time of the CCD cameras is a very important parameter. The method to measure the accurate exposure time of the CCD camera is suggested based on the short pulsed laser source, timing sequence control system, high speed photo- detector and oscilloscope with the precision of 0.1μs. This method solved the problem of no effective measurement method with high precision for this parameter. The accurate minimum exposure time of IGV-B4820 of company Imperx was tested by this method successfully.
An Improved Genetic Algorithm Based on K2(m) Triangulation of Continuous Self-Mapping
Authors: Zhang Jing Jun , Chen Huan , Gao Rui Zhen
Published: July 2011

In this paper an improved genetic algorithm based on the simplex self-mapping fixed point algorithm is proposed. With this algorithm, the optimal problem of n-dimensional closure function will be transformed as the solution of approximate fixed point problem of n-dimensional standard simplexes by homeomorphism mapping. The genetic operators relying on the integer labels are designed. In this case, whether every individual loading simplex of the population is a completely labeled simplex can be used as an objective convergence criterion. The simulation results demonstrate that the proposed algorithm is valid and effective.
Structural Optimization Based on Stochastic Finite Element Analysis and Optimality Criteria Methods
Authors: Zhao Wei , Liu Ji Ke , Lu Zhong Rong
Published: July 2011

An approach for structural optimization with uncertainty is proposed in this paper, which is based on stochastic finite element analysis and an optimality criteria method. The sensitivity analysis of the structural failure probability via design variables are performed by difference method according to stochastic finite element analysis. The information of the partial derivatives is incorporated into the optimality criteria method. The optimization of the section of a beam with uncertainty, as a numerical example, is illustrated by the approach. The results demonstrate the efficiency of the approach.
Wave-Induced Load Study on a Deck Barge
Authors: Xie Yong He , Wang Wei , Li Gang Qiang
Published: July 2011

There are wide molded breadth and molded depth of the deck barge, so the ship specification cannot be used to calculate the deck barge’s wave-induced load[1]. According to the deck barge’s characteristics its wave-induced load has been calculated using 3D-dimensional hydroelasticity theory in the present paper, the dry-modal model and panel model have been established, and the oscillating pressure and wave-induced load have been calculated. The calculation results show that the method is reasonable to calculate the wave-induced load of the deck barge.
The Virtual Prototyping Design for AKD Rolled Steel Bundling
Authors: Wang Feng Hui , Ma Bei Yi , Gao Xing Qi
Published: July 2011

AKD Rolled Steel Bundling is automatic equipment which is suitable to bundle and pack the clavate or tubular steel. It is developed by Technical Garden Company affiliated University of Science and Technology Liaoning. The design of this type equipment involves multitudinous domain knowledge such as Hydraulic transmission, Electrical Control and Machinery. Therefore, an advanced design technology for virtual prototype is introduced into it. A comprehensive test is carried out on the virtual machine model without the physical prototype.
Research and Creation of Printing-Like Effect Digital Jacquard Fabric
Authors: Zhou Jiu
Published: July 2011

In this paper, innovative design of printing-like effect digital jacquard fabric based on layered-combination design mode is introduced with proper design illustrations. Directly borrowed from layered design method of digital image and corresponding color theory, the innovative design method theoretically can be divided into colorless mode and colorful mode two parts. Following design method of full-color compound structure invented specially for layered-combination design mode, several colorless single-layer structures can be combined to form a full-color compound structure, which enables digital jacquard fabric to express printing-like effect with mega-level mixed colors. The results of study provided the possibility of opening creative horizon and aesthetical dimension for jacquard fabric design.
Quadruple-Arc Gear Design, Digital Processing and Carrying Capacity Test
Authors: Ren Zhong Yi
Published: July 2011

Both the industrial sector and the academic study is the single-arc and double-arc gear at present, that is, tooth profile curve are composed by one or two arc. This paper propose a new arc gear —, which tooth profile curve are composed by four arcs, and gain a invent patent (patent number is 200810212732.1). Finite element analysis and tests conformed that qssuadruple-arc gear carrying capacity is more than 30% higher than double-arc gear. Tests also confirmed that quadruple-arc gears are smooth and have less noise compared with double-arc gears when running.
Quality Control in the Process of Drying Forming of Water-Soluble Plastic Film
Authors: Hao Xi Hai , Xiao Ying Zhe
Published: July 2011

We analyzed systematically the causes of various defects of water-soluble plastic film by the production process, and comprehensively discussed the corresponding treatments to reduce or eliminate the defects, to offer theoretical basis and practical methods to the quality control in the production of water-soluble plastic film.
Research on Point-by-point Calculation Compensation Algorithm for Scanning Contours of Rapid Prototyping
Authors: Liu Hong Jun , Gao Hui
Published: July 2011

Applicable and effective compensation algorithm can improve the precision of rapid prototyping manufacturing. Based on analysis of present compensation algorithms, a point-by-point calculation compensation algorithm is developed in this paper. The rationality of intersection points of segments of compensation contour is checked point by point, and then the unreasonable points are adjusted. The compensation contours can be gotten. The calculation process of point-by-point calculation compensation algorithm is detailed introduced in this paper. The practicality of algorithm is tested and verified by examples.
Effect of B2O3 and CaF2 on Viscosity of Ladle Refining Slag
Authors: Wang Hong Ming , Zhang Ting Wang , Zhu Hua , Yan Yong Qi , Zhao Yi Nan
Published: July 2011

To avoid slag sticking onto the snorkel during CAS-OB ladle refining process, B2O3-CaO(mass ratio equals 1:1) and CaF2-CaO(mass ratio equals 1:1) were respectively employed as modifiers added to decrease the viscosity of ladle slag. The rotary cylinder method was adopted in the viscosity measurements. The results showed that the modifiers could decrease the viscosity of ladle refining slag remarkably. At 1500°C, the viscosity of ladle slag without any modifiers is about 6.0 Pa·s. But by adding more than 10mass% CaO-B2O3 or CaO-CaF2, the slag viscosity at 1500°C could be decreased lower than 1.0 Pa·s. The mechanism of modifiers decreasing the slag viscosity was analyzed.
Effect of Micro Scale on Prediction of Thermal Residual Stresses in Multilayer Ceramic Capacitors (MLCCs)
Authors: Jiang Wu Gui , Li Gang Long , Gu Yuan Tong
Published: July 2011

The conventional finite element method (FEM) cannot investigate the size effect on thermal residual stresses induced by the sintering process in micro multilayer ceramic capacitors (MLCCs). In this paper, a FE two-dimensional single layer model is developed for investigation of the effect of the micro scale on prediction of the residual thermal stresses in MLCCs. In this FE single layer model, the strain gradient effect is considered. It is found that with decreasing single layer thickness, the shear stress increases significantly in the ceramic layer near the electrode tip, which might cause cracking of the ceramic layer near the electrode tip. The numerical results also show that the predictions of the thermal residual stresses in MLCCs are strongly dependent on the micro scale. The residual thermal stresses induced by the sintering process exhibit strong size effects and, therefore, the strain gradient effect should be taken into account in the design and evaluation of MLCC devices.
Water-Based UV-Curable Polyurethane Based on Wheat Straw Lignin Obtained by Ethanol Extraction
Authors: Chu Fu Qiang , Wu Xiang Jiao
Published: July 2011

The aim of this paper is to discuss the application of ethanol-dissolved lignin in preparing high value products. Lignin was extracted from wheat straw by ethanol and used to prepare water-based UV-curable polyurethane. The preparation of water-based UV-curable polyurethane was completed by a three-step reaction. Besides lignin, toluene- 2, 4- diisocyanate (TDI), dimethylolpropionic acid (DMPA), 2-hydroxyethyl acrylate (HEA) and polyether glycol (PPG) were used. The effect of lignin content on the synthesis process was studied. The prepared lignin polyurethane was neutralized with tertiary amine (TEA) and dispersed in water. The properties of the final product, for example, rheological property, average particle size, UV-curing ability and mechanical property, etc. were characterized. Results indicated that the lignin polyurethanes could cure quickly and the presence of lignin with a proper proportion during the synthesis had a positive effect on the tensile strength of cured film.
Preparation and Characterization of Hydrophilic PVDF Membrane via Graft Modification by Maleic Anhydride
Authors: Wang Li Guo , Zhang Xiao Guang , Hou Shu Fang , Wang Xiu Ju , Wang Ai Min , Liu Si Quan
Published: July 2011

Hydrophilic polyvinylidene fluoride (PVDF) flat ultrafiltration membranes were prepared by wet-spinning method. The effects of technical parameters of maleic anhydride grafted onto PVDF on the performance of hydrophilic PVDF membranes were investigated, the preparation technical parameters were determined, and the hydrophilic PVDF flat membranes were prepared. Then, hydrophilic PVDF membranes were characterized in terms of pure water flux, contact angle, infrared spectroscopic analysis and scanning electron microscope(SEM). The results showed that maleic anhydride had been grafted onto PVDF, and the hydrophilic performance of the modified membrane was better than the traditional one.
Synergistic Effect between Montmorillonite Intercalated by Melamine and Intumescent Flame Retardant (IFR) on Polypropylene
Authors: Zhu Hong Fang , Li Juan , Xu Liang , Tao Kang , Xue Li Xin , Fan Xin Yu
Published: July 2011

This Montmorillonite modified by melamine (MA-MMT) was prepared via cation exchange reaction by using melamine salt as intercalation reagent. MA-MMT and Na-MMT was combined with intumescent flame retardant (IFR) to be adopted into polypropylene (PP), respectively. The synergistic effect between MA-MMT and IFR and the influence of melamine in MMT layers on fire-resistant performance was evaluated. Results of limited oxygen index (LOI) tests and UL-94 tests indicate that melamine salts in MMT layers behaved better than Na-MMT in PP/IFR system. According to the results of cone calorimeter tests and scanning electron microscope (SEM), it concludes that melamine salts act as gas agent to provide migration impetus and expanded power, which caused a well-structured and strong char that had better ability to endure heat erosion. A good synergistic effect between MA-MMT and IFR is constructed.
Solvothermal Synthesis of the SnO2 Nanomaterial for Highly Reversible Lithium Storage
Authors: Li Chao , Zhu You Qi , Xia Tong Chi , Wei Ying Liang
Published: July 2011

The SnO2nanomaterial for highly reversible lithium storage was successfully synthesized via a simple solvothermal route at a low temperature. According to the XRD and TEM analysis, the nanostructure and the morphology of the obtained samples were constructed by ultrathin SnO2nanorods with diameter of about 10 nm and length of 30 nm. When used as anode materials for lithium ion batteries, the prepared SnO2nanomaterial exhibited a relatively high reversible capacity of 950.9 mAh·g-1and excellent cycling stability. The enhanced electrochemical performance of the SnO2nanomaterial could be attributed to the unique nanostructure, which could accommodate the large volume change during cycling and provide an excellent electronic conduction pathway.