bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Enzymatic Modification of Masson Pine Mechanical Pulp on Fiber Morphology and Pulp Properties
Authors: Luo Qing , Li Xin Ping , Liu Ye , Liu Jun Hua
Published: October 2011

Mechanical pulping is a kind of high yield pulping that comes with the comprehensive utilization of plant material. Mechanical pulp has lots of benefits, such as simple process, low pollution, good bulkiness, fine stiffness, excellent optical performance and good printability. However, it also has disadvantages of lower paper physical strength and higher refining energy. In this paper, AU-MTPE90 enzyme and acid xylanase were used to modify the masson pine mechanical pulp before refining. The effects of modification on the shape parameters of masson pine mechanical pulp fiber and pulp properties were studied. The results showed that after modified by AU-MTPE90 enzyme and acid xylanase，the drainability of the refined pulp increased, the average fiber length increased and the fines percent decreased. The curl index and kink index increased slightly after modified by AU-MTPE90 enzyme，while the kink index decreased after modified by xylanase.
Finite Element Analysis of Materials Flow Behavior in Friction Stir Welding of 7075 Aluminum Alloy Plate
Authors: Guo Zheng Hua , Zhao Gang Yao , Ke Li Ming , Xing Li , Zhu Shun Feng
Published: October 2011

A 3D elastic-plastic and coupled thermo-mechanical FE model for friction stir welding(FSW) of 7075 aluminum alloy plate was developed based on the dynamic explicit code ABAQUS/explicit, then the FSW process of 7075 aluminum alloy plate was simulated and the materials flow behavior was analyzed. The results show that in the horizontal direction of the plate, two patterns of materials migration are produced: (1) the material rotates with the tool and finally deposits the tentative cavity behind the pin; (2) the material transfers in the mode of laminar flow. Furthermore, the streamlines of material in advanced side (AS) are bent along the reverse welding direction. After bypassing the pin, the material of retreating side (RS) moves backward it, and extends to AS.
A New Porous Mullite Nozzle for Refining Molten Aluminum
Authors: Zhan Hai Hong , Zeng Jian Min , Chen Ping , Lin Zhuo Yi
Published: October 2011

A new porous nozzles for refining molten aluminum were made from mullite，graphite powder, red mud and sodium silicate. The relationships between graphite content and permeability, sintering parameters and permeability, graphite content and compressive strength were investigated, respectively. The internal structures of the nozzle before and after sintering were observed by SEM. The experimental results show that the permeability of sample can be improved by sintering at temperature of 1000°C for 2 hours. As graphite content increases, the permeability of sample increases, yet the ultimate compressive strength decreases. The compressive strength can be enhanced by using combination of different sizes of mullite particles.
Study on Simulation of Dispersing Uniformity of Aluminum Alloy Melt in Rheo-Casting Mold
Authors: Xia Jian Sheng
Published: October 2011

Based on the soft of FLOW3D, the numerical simulation was study the effect of runner-reduction ratio on the dispersing uniformity of added powders inside alloy melt. The parameters studied were gating shape and reduction ratio in cross section area. The results revealed that dispersing uniformity of powders, the flat gating system is better than the comb one, and the best dispersing uniformity was achieved when the reduction ratio was up to 50%.
The Experiment of CO2 Pollution and Treating in Silicate-Based Drilling Fluids
Authors: Sun Yu Xue , Jiao Chun Xue , Fu He
Published: October 2011

Through simulation experiment of CO2 invading into drilling fluids that viscosity and yield point are increased dramatically and drilling fluids is in a bad rheology. The concentration of HCO3- and CO32- both are increased, the concentration of OH- and pH value of drilling fluid both are reduced. It does not meet the drilling requirement as the concentration of CO2 is too high, so we must eliminate it as soon aspossible. The glue soluting with KOH and CaO through some Lab experiments have optimized, which has a better performance for prevention and management of CO2 pollution.
Influence of Microstructure of TC4 Titanium Alloy on Ultrasonic Velocity and Attenuation
Authors: Ai Yun Long , Liu Li , He Wen , Liang Bing Liang , Xu Ji Lin
Published: October 2011

Primeval TC4 titanium alloy was subjected to solution treatment at 1150°C for 1h, followed by water quenching, oil quenching, air cooling and furnace cooling, respectively. The pulse-echo method was carried out to measure ultrasonic longitudinal wave velocities (ν) and attenuation coefficients (α) of these heat-treated samples. The relationship between microstructures of different cooling rates and ultrasonic parameters such as ultrasonic longitudinal wave velocities (ν) and attenuation coefficients (α) was investigated. The results show that the microstructures of heat-treated TC4 alloy were α phase and β boundaries, and the ultrasonic longitudinal velocities and attenuation coefficients of these heat-treated samples, in turn, increased with reducing the cooling rate from water quenching to furnace cooling.
Study on Determination of Friction Model at the Tool-Chip Interface of Titanium Alloy Ti6Al4V Based on Orthogonal Cutting
Authors: Yuan Yue Feng , Chen Wu Yi
Published: October 2011

It is necessary for cutting simulation to determine the friction model at the tool-chip interface suitable for metal cutting process. Cutting force experiments in orthogonal turning titanium alloy TI6AL4V are carried out with cement carbide tool KW10. The Coulomb frictions at the tool-chip interface are calculated based on measured cutting force, and the friction model is regressed, where cutting speed and feed rate are presented.
Effect of Cold Reduction Ratio and Annealing Temperature on Microstructure and Mechanical Property of Added Phosphorus High Strength Nb-IF Steel
Authors: Wang Min Li , Xiao Li , Zheng Zhi Wang
Published: October 2011

Hot rolled added phosphorus high strength IF steel was used to study the effect of cold reduction ratio and annealing temperature on the microstructures and mechanical properties of experimental steel. The experimental results showed that the recrystallization has finished under 840°C to 880°C annealing temperature followed 65% to 75% cold reduction ratio. Under 600°C coiling temperature, 840°C annealing temperature and 65% to 75% cold reduction ratio, the yield strength, tensile strength ,elongation percentage, yield point elongation, the plastic strain ratio and strain hardening exponent were approximate 240MPa, 410MPa, 36.0%, 1.6%, 0.26 and 1.9. Under 650°C coiling temperature, 860°C annealing temperature and 65% to 75% cold reduction ratio, and that were approximate 240MPa, 415MPa, 35.0%, 2.0%, 0.24 and 1.9. Under 700°C coiling temperature, 880°C annealing temperature and 65% cold reduction ratio, and that were approximate 190MPa, 380MPa, 35.0%, 0.8%, 0.26 and 2.0. Therefore, the suggested the optimal coiling temperature6 is 600°C, cold reduction ratio is 65% to 75%, annealing temperature is 840 °C, and it obtains optimally match of high strength and punching property.
One Numerical Simulation Method and its Applications for Fatigue Crack Growth
Authors: Chen Long , Cai Li Xun , Huang Xue Wei , Bao Chen
Published: October 2011

Abstract: Based on the Miner′s linear accumulative damage theory and the low cycle fatigue damage parameter that is relative to the total strain amplitude and the mean stress of the plastic zone near crack tip, a new numerical simulation method to predict the fatigue crack growth (FCG) of materials is presented. The numerical FCG results for middle-cracked tension (MT) specimens of Cr2Ni2MoV steel, TA12 and TC4 alloys by ANSYS are closed to those by tests. Therefore, the new method has capability to give good FCG prediction accuracy for different materials. Furthermore, the Paris FCG models of TA17 and TC11 alloys were predicted by this method and can be referred to the key engineerings.
Study on the Influence of Deforming Velocity on Steel Ball Quality Based on DEFORM
Authors: Ren Xiao Zhong , Liu Yong Qing
Published: October 2011

The ball defects generated in skew rolling process have restricted to large extent the further application of skew rolling technology in ball manufacturing industry. Research was carried out so as to find the factors and laws of influencing on skew rolling ball quality. It was found by analyzing the forces exerting on the ball that the deforming velocity of ball had the largest influence on the resistance to deformation. Simulations were done respectively under different roller obliquities, different distances between two guide plates, and different rotation speeds of rollers by means of DEFORM-3D software. Finally, the influencing factors and laws on ball quality were discovered.
Carbonation of High Strength Concrete
Authors: Khan Mohammad Iqbal
Published: October 2011

High strength concrete consisting of binary and ternary blended cementitious systems based on ordinary Portland cement, pulverised fuel ash and silica fume were investigated for carbonation. PFA up to 40% was used and to these blends 0, 5, 10, and 15% SF was incorporated as partial cement replacement. Results of carbonation of concrete cured in mist and air are reported. It was found that carbonation linearly increases with an increase in PFA content. Concrete with OPC only and concrete with 10% SF content showed insignificant change in carbonation when comparing air cured and mist cured concrete. The maximum carbonation depth observed for air cured concrete (containing 40% PFA) was less than 4 mm while in the case of mist cured concrete it was less than 2 mm. This depth is still far less than the cover of reinforced steel bars to cause corrosion.
Analysis of the Relationship between CTOD Toughness and Micromechanism of Marine Steel Weld Joints
Authors: Leng Shu Wei , Miao Zhang Mu , Qiu Fu Xiang , Niu Li Na , Miao Ting
Published: October 2011

Several tests including CTOD and Charpy impact have been performed on the weld joints of high strength low alloy steel S335G10+N to identify the toughness. The fracture surface and microstructure of samples extracted from the weld joints are characterized using scanning electron microscopy. Based on all data obtained some relationships between toughness and microstructure has been detected. (1) The tendency of Charpy impact energy distribution with the position of notch is similar to the CTOD values in WP and FL but different in FL+2.CTOD values of FL+2 are greater than those of FL, but the Charpy impact energy has an opposite tendency. (2) The appearance of Pearlite and upper bainite found in WP sample S3554 is regarded as one of the reasons for the lowest CTOD values. The cavity and quasi-cleavage in S35510 fracture surface indicate an inferior toughness compared with some dimples and ripple morphology of slip separation in S3552. (3)Grains close to the fracture surface in the 35511 (Stable crack growth) of FL +2 were elongated owing to plastic deformation caused by crack growth. (4)Hardness of the HAZ is equal to fusion zone and lower than base metal or weld position in S35511. Hardness of fusion zone increases with the depth. (5)A big difference of Average Grain Size is found in microstructure close to the fracture surface among S3557, S3556 and S3559.The greater the Average Grain Size is, the lower the CTOD value will appear.
Effect of Activating Flux and Welding Parameters on Performance of Aluminum Alloy Weldment in GTA Welding Process
Authors: Lin Hsuan Liang , Juang Hung Wei , Yan Jia Ching
Published: October 2011

The purpose of this work was to investigate the effect of activating fluxes and welding parameter to the penetration and depth-to-width ratio (DWR) of 6061 aluminum alloy welds. Bead-on-plate argon gas tungsten arc (GTA) welding process was made on 6061 aluminum alloy of plate without filling metals. The activating fluxes used in the experiment were CaO, ZnO, SiO2, TiO2, Al2O3, Cr2O3, CaF2 and Na2CO3. Based on the higher penetration of weld bead and welding arc voltage, four fluxes were selected to create three new mixtures using 50% of each original fluxes. The mixed fluxes were used to investigate the effect to the welding penetration. Finally, The Taguchi method was employed to achieve optimal DWR of weld bead and investigate the welding parameters that significantly affect welding quality. The experimental procedure of GTA welding with activating flux via the Taguchi method produced full penetration of weld bead on a 6.35 mm thickness of 6061 aluminum alloy plate with single pass weld.
Numerical Simulation of Cu-Cu Interface Thermal Resistance by Utilizing Laser Photothermal Method
Authors: Zhang Qing Zhi , Wu Gang , Pang Zhi Yang , Chen Jin Zeng , Li Guang Hua , Bi Ke
Published: October 2011

By using the high purity Cu samples as the study objects and based on the experimental measurement results of the interface thermal resistance, the study on the relations between the interface thermal resistance, the laser modulation frequency and the phase lag under different temperatures has been carried out through the Matlab numerical simulation. It is shown that the corresponding phase lag is increasingly bigger but the interface thermal resistance is increasingly smaller while the interface temperature become higher at a certain pressure; furthermore, the study on relation between the interface thermal resistance and the temperature variation has been carried out and it may be concluded based on the analysis that the interface thermal resistance changes remarkably while the temperature scope is from 20K to 60K and the interface thermal resistance varies slightly while the temperature scope is from 60K to 120K.
Model Test Research of the Influences of Rock-Fall Impaction on Accelerations of the Cut-and-Cover Tunnel Structure
Authors: Wang Yu Suo , Zhang Ke Yue , Tang Jian Hui , Liang Dong
Published: October 2011

On conditions of different weight and height, the tunnel portal structure’s accelerations evoked by rock-fall impaction have been researched in laboratory by using a 1/30 scale similar model. The study shows that the normal acceleration value is the biggest, the lateral acceleration is second and the longitudinal acceleration is the minimum. There is a simple linear relationship between the structure’s acceleration, the rock weight and the rockfall height when the slope gradient is 1:0.5 and the slope surface is slippery. The multiple linear relationship between the structure’s normal acceleration, the rock weight and the rockfall height has been obtained.
Dynamic Responses of a Simply Supported Bridge to Moving Vehicle Loads
Authors: Lin Jeng Hsiang
Published: October 2011

The estimation of dynamic responses of a bridge under vehicle loads moving along the bridge is frequently a problem of great interest for bridge engineers. Presented herein is an analytical approach to estimate the dynamic responses of a simply supported Euler-Bernoulli bridge under a set of vehicle axle loads moving along the bridge at constant speed. The approach involves convolution of the vehicle axle loads with modal responses of the bridge. The convolution integral is solved in time domain by a numerical integral approach. The solution was verified and good agreement was found.
Dynamic Analysis of Axially Loaded Beams under Arbitrary Transverse Force
Authors: Zhang Yi , Chen Li , Zhao Jian Kui , Peng Chun Lin
Published: October 2011

A theoretical analytical solution on the linear responses of axially loaded beams subjected to arbitrary transverse impulsive loads was proposed in this paper, based on the Timoshenko’s beam theory. The equivalent matrix of frequency, matrix of loads and modified matrix of mass were established respectively. Furthermore, the affecting parameters of the beams such as length-depth ratio, axial compression ratio, boundary constraints and load conditions were discussed based on the analytical solution developed above, which were assumed subjected to the typical triangle impulsive loads. The results and conclusions were also helpful to the anti-blast analysis of columns
Finite Element Analysis of Ice-Cone Interaction
Authors: Wang Gang , Yu Chi
Published: October 2011

A numerical simulation model which describes the ice-cone interaction process is presented. The model is based on the field observation which was made on the prototype platform named JZ20-2 MUQ. The dynamic numerical simulations are performed by using the LS-DYNA program and the present model. The failure evolutionary processes are analyzed between ice and conical shaped structure according to the stress distributions in the ice sheet. The distributions of the ice energy and contact force during the ice-cone interaction are also presented. The numerical results indicate that the present model and the modeling method are validated and reliable in describing the dynamic processes of the ice-cone interactions. Furthermore, the results could also provide the references for the ice resistant design of conical structure.
The Performance and Strength Mechanism of Stabilized Aggregate Containing Special Cement with Desulfurization Residue
Authors: Zhou Ming Kai , Zhao Qing Lin , Chen Xiao , Fan Zhi Yong
Published: October 2011

Stabilized aggregate containing Special cement with desulfurization residue is characterized by long setting time, slight expansion, and retarded inducing strength, therefore, research was conducted on its performance. Research results show that when on 28d and compared with stabilized aggregate of PC 32.5 cement, the stabilized aggregate of special cement’s unconfined compressive strength increased by 17%, dry shrinkage energy anti-cracking coefficient by 78%, whereas resilient modulus and splitting strength indicated small changes, whilst the performance of special cement materials showed vast improvements through significant increases in the stabilized aggregate’s mechanic and shrinkage performances. The strength of stabilized aggregate from special cement containing desulfurization residue mainly comes from AFt, Ca(OH)2 and the C-S-H gel formed in the hydration of the special cement and also with the continuing dissolution of CaSO3. The resultant new phase of C3A•CaSO3•11H2O is formed after the 7d hydration period. Desulfurization residue in cement consists of a significant amount of Ca(OH)2, therefore, the alkali content in the hydration phase is maintained at a very high level, which affects the consistency of ettringite through the formation of higher-quality needle-like crystals during hydration, which in turn is beneficial to reduce the base material’s self-shrinkage capability and improve its anti-cracking performance. At the same time, stimulated by Ca(OH)2-CaSO4, the hydration of fly ash and ground granulated blastfurnace slag is also improved, which is advantageous for further improving the cement’s strength and anti-cracking performance at a later stage in the curing process.
Three Dimensional Cosserat Continuum Model and its Application to Analysis for the Cantilever Beam
Authors: Tang Hong Xiang , Hu Zhao Long
Published: October 2011

A basic 3D Cosserat continuum theory and corresponding finite element formulations are deduced. The deflections of a cantilever beam are analyzed by the 20-nodes solid elements based on the classical continuum theory and Cosserat continuum theory respectively. Compared with analytical solution brought forward by Timoshenko and Goodier, it illustrates that the numerical results based on Coseerat FEM are effective and more accurate and closer to the analytical solutions by choosing an appropriate value of the characteristic internal length, which also testifies the capability of reflecting the intrinsic property of the cantilever beam.
Green Quasifunction Method for Bending Problem of Clamped Orthotropic Thin Plates with Trapezoidal Boundary Shape
Authors: Li Shan Qing , Yuan Hong
Published: October 2011

The Green quasifunction method(GQM) is employed to solve the bending problem of clamped orthotropic thin plates with trapezoidal boundary shape. Firstly the governing differential equation of the problem is reduced to the boundary value problem of the biharmonic operator, and then it is reduced to the Fredholm integral equation of the second kind by Green’s formula. A Green quasifunction is established by using the fundamental solution and the boundary equation of the problem. This function satisfies the homogeneous boundary condition of the problem. The irregularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. A numerical example demonstrates the feasibility and efficiency of the proposed method, and it is a novel mathematical method.
Dynamics Optimization for the Valve Train of a Diesel Engine
Authors: Liu Hai Yan , Wang Xiao Bo , Qin Wen Jie
Published: October 2011

The parameterized multi-body system dynamics model of the valve train of a diesel engine is built in ADAMS. The spring stiffness, spring force, valve mass and valve stiffness are set as experimental factors, and valve seat force and maximum acceleration are set as responses. Dynamic simulation experiments are carried out using design of experiment (DOE) method, from which the notable factors are obtained. The functions of response surfaces on notable factors are gotten, and then optimization design is implemented based on response surfaces.
Research on of Litterfall Production of Eucalyptus Globulus Plantation
Authors: Deng Rong Gen , Liao Wei Ming
Published: October 2011

Based on field investigation and lab analysis, litter production and season dynamic in the different ages of Eucalyptus plantation (2006, 2005, 2004, 2003, 2002) were studied in this paper. Based on litter collection during 1 years, the annual litter production was estimated to be 2797 kg•hm-2, 4489 kg•hm-2, 3098 kg•hm-2 and 3692 kg.hm-2 for 2006, 2005, 2004, 2003 and 2002. Variance analysis showed that the difference of the litter production of the eucalyptus plantation between 2006 and 2003, 2005 reached the extremely significantly level (p<0.01). Monthly litter production showed seasonal dynamics to some extent. There were two peaks for 2006 and 2002, with occurring in April, September and, February and April respectively and three peaks for 2004 and 2003, with occurring in in February, April and June. But there was only one peak appearing in June. Synthetically, the litter production of 2006, 2002 achieved maximum in April accounting for 13.50% and 28.09% of the total but 2005, 2004 and 2003 achieved in June accounting for 23.83%, 21.33% and 19.23% respectively. Fallen leaves accounted for 84.86%~90.04% of the total litter, droppings for 5.01%-6.70%, branches for 2.95%-4.52%, barks for 2.64%-3.62%, and fruits for 0.00%-0.55%%.
Microstructure and Temperature Stability of Ca Substituted Forsterite Ceramics
Authors: Song Kai Xin , Zheng Peng , Hu Xiao Ping , Deng Jiang Xiang , Wu Jun , Xu Jun Ming , Ying Zhi Hua , Zheng Liang , Qin Hui Bin
Published: October 2011

In this paper, the dependance of microstructures on temperature stability of the (Mg1-xCax)2SiO4 (0≤x≤0.5) ceramics prepared by the conventional solid-state route were investigated. The XRD and SEM testing results showed the (Mg1-xCax)2SiO4 ceramics were mainly composed of both forsterite (Mg2SiO4) phase and Monticouite (MgCaSiO4) phase. Significantly, with increasing x, the ceramic temperature coefficients of resonant frequency (τf) were strongly correlated to the ceramic crystalline phase compositions and could be adjusted to near zero value through changing the contents of both phases. And its dielectric constants (er) were kept in the range of 6.8 to 8.7, and the quality factors (Q×f value) in the range of 18, 080 GHz to 55, 840 GHz at 15GHz.
Analysis and Improvement of Mobile Payment Security Based on SET Protocol
Authors: Li Xiao Min , Liang Bing , Wang Jian Ping
Published: October 2011

In order to improve the performance of SET protocol based on the original one, such as security and integrity of information, non-repudiation etc, a improved SET protocol is used in this paper. By introducing client wallet and server wallet, the improved SET protocol can rationally solve the conflicting decision analysis problem between the businesses and customers. The mobile payment based on the improved SET protocol has many features such as confidentiality, integrity, transaction atomicity and goods atomicity etc. Mobile payment based on SET protocol will be a very popular payment way in the future.
Cutting Force Impact to Tool Life of CT5015 in High Speed Machining by Applying Negative Rake Angles
Authors: T. Adesta Erry Yulian , Riza Muhammad , Ali Mohammad Yeakub
Published: October 2011

Cermets become increasingly popular cutting insert in recent years. They are generally good when accuracy and finish are criteria for the operation. Several improvements have been made to increase their performance in machining process such as higher resistance to thermal deformation and lower conductivity than carbide tools that wear rapidly. This study is to investigate cutting force and tool wear under different rake angles in high speed machining process. Experiments were carried out by using cermet insert (CT5015). Different rake angles have been applied in the experiments which are 0o, -3o. -6o, -9o and -12o respectively with cutting speed 1000 m/minute and feed rate 800 mm/minute. For every single pass of cutting, cutting force, wear rate and cutting temperature were measured respectively by surface roughness tester, dynamometer, Scanning Electron Microscope (SEM) and infrared thermometer. The experimental results showed that the more negative angles the higher cutting force produced. Simultaneously, cutting temperature increases following the incremental of cutting force. It caused wear occurred faster and lead to reduce the life of cermet inserts.
Generalized Reynolds-Orr Energy Equation with Wall Slip
Authors: Ren Ling , Xia De Hong
Published: October 2011

The Reynolds-Orr energy equation is generalized to include the velocity slip effect at the walls, for investigating the energy gain or loss in the disturbed slip flow. Taken the Poiseuille flow, typical prototype of parallel shear flows as an example, it is found that for the very weak effect of wall slip, the disturbance energy being transferred from the basic flow overcomes the viscous dissipation, resulting in the growth of disturbance energy and the destabilizing role of wall slip. Otherwise, the viscous dissipation overcomes the energy production resulting in the decay of the disturbance energy and the stabilizing role of wall slip.
Preparation and Application of Titanate Nanotubes on Methylene Blue Degradation from Aqueous Media
Authors: Lin Wen Churng , Yang Wein Duo , Chung Zen Ja , Chueng Hui Ju
Published: October 2011

Titanate nanotubes were synthesized at various hydrothermal temperatures and reaction times by the hydrothermal process and used as photocatalyst. BET analysis was conducted in order to find out the surface area of these as-prepared samples and it was found that the surface area increases with rise in temperature till 130 oC. Synthesized as-prepared titanate nanotubes were applied on methylene blue degradation from aqueous media by UV irradiation. It was observed that dye removes ~99% from the aqueous media at a titanate nanotubes dose of 2 g/L.
Study on Thermal Fatigue Performance of Cold Work Roll Steel
Authors: Wu Guo Sheng , Wang Yu Tao
Published: October 2011

Thermal stability and thermal fatigue performance tests of four kinds of cold work roll steels were done. There are indications that after isothermal 2～6 hours under conditions of 400°C～720°C, the best is 8Cr5SiMoV steel, its thermal stability grows up as isothermal time increase; the second is 8Cr4MoV steel; the worse are 8Cr5MoV steel and 9Cr3MoV steel; and all the thermal stability of four kinds of cold work roll steels are lower than 400°C. Thermal fatigue performance of four kinds of cold work roll steels are basically same as their thermal stability, i.e. the best is 8Cr5SiMoV steel, and the second is 8Cr4MoV steel.
Highly Sensitive and Selective Pymetrozine Colorimetric Sensor Based on P-Aminobenzenesulfonic Acid Modified Ag NPs
Authors: Chen Jun , Dong Cai Xia , Zhang Yi Jun , Zhou Xiao Mao , Bai Lian Yang
Published: October 2011

This paper reports a novel colorimetric sensor for pymetrozine based on p-aminobenzenesulfonic acid functionalized silver nanoparticles (p-ABSA-modified Ag NPs), which were characterized by IR spectroscopy, ultraviolet–visible spectroscopy (UV–vis), and transmission electron microscopy (TEM). The newly synthesized p-ABSA-modified Ag NPs are yellow in color due to the intense surface plasmon absorption band centered at 400nm. In the presence of pymetrozine, the yellow p-ABSA-modified Ag NPs solution turns to dark green, with a dramatic surface plasmon absorption band centered at 660nm. Moreover, high selectivity for pymetrozine was approved by the comparative experiments with an absorption ratio of A660/A400 more than 0.7. This highly sensitive sensor allows a direct and rapid quantitative assay of pymetrozine with a colorimetric limited detection concentration of 0.01mg/L.
Experimental Tensile Study on the Behavior of Composite Material with Roving Waviness
Authors: Almurib Haider A. F. , Al-Qrimli Haidar Fadhil , Kumar Nandha
Published: October 2011

This paper describes the materials and the methods used to make a tensile test of composite materail. The experimental study is conducted to observe the crashing behavior of composite material using different types of material namely; glass/epoxy carbon/epoxy and jute/epoxy specimens. Then, the behavior of the composite specimens is observed to determine the best material that produced the highest mechanical properties to be used as a material for a straight bevel gear in robotic arm application. The experimental work has been divided into two stages. The first stage is the experimental process, which involves fabrication of the specimens for the tensile test. The second stage is the preparation of specimens for the tensil test.
Formation of Intermetallic Compounds on the Bond Interface of Aluminum-Clad Copper and its Influence on Bond Tensile Strength
Authors: Xie Wei , Tomiko Yamaguchi , Kazumasa Knishio
Published: October 2011

Production of aluminium-clad copper has been performed using vacuum roll bonding, hundreds nm of intermetallic compounds are formed on the bond interface. On the tensile testing, it is broken from the base metal of aluminium and high bond tensile strength is available. In this study, heat treatment has been taken to aluminium-clad copper produced by vacuum roll bonding. Microstructure observation, EPMA, EDS and XRD have been carried to the investigation of the formation of intermetallic compounds. As a result, 3 types of intermetallic compounds such as CuAl2, CuAl and Cu9Al4 were formed at the bond interface of aluminium-clad copper. And it was clarified that the apparent activation energy for growth behavior of CuAl and Cu9Al4 is lower than CuAl2. The effect of intermetallic phases on bond strength has also been investigated with the growth of intermetallic compounds. The decrease of tensile strength has been clarified. The broken position is near the interface between CuAl2 and CuAl. Furthermore, the bond strength of aluminum-clad copper is seriously affected by the thickness of CuAl2.
Integration System of Intelligent Design and Modeling Oriented to Requirement Configuration for Palletizing Robot
Authors: Li Zhong Ming , Liu Wei , Li Jin Quan
Published: October 2011

The method of computer-aided conceptual design is present for the palletizing robot. Intelligent design and modeling are integrated in this system. Index of design requirement is quantified hierarchically and various kinds of attributes of function carriers are digitized. The analytic hierarchy process is used for reference to check the consistency of quantitative value of attributes and the rationality is ensured. Design requirement can be configured flexibly in man-computer interaction module and the optimal scheme is generated automatically according as the computation of evaluation function. Model file of virtual prototype for ADAMS can also be generated automatically by auto-modeling module. Software system of computer-aided conceptual design for palletizing robot is developed based the method mentioned above.
A Study for the Mirror Surface Polishing by Using the Ring Shaped Tool
Authors: Wang Shuh Yi
Published: October 2011

The feasibility of mirror surface polishing by using the ring shaped tool (abbreviated as the RST) is studied. This novel polishing process is expected to apply in the fabrication of precise mold and optics. In order to reduce the tool wear effect, the semi-spherical tool was replaced by the ring shaped tool. The experimental results show that the machining rate is not affected by the tool wear, That is, this new process provides excellent machining repeatability. On the other hand, the mirror surface with Ra 4.4nm was yielded in the lager area polishing.
Kinematics Analysis of on-Off Pressure Mechanism with Flexible Link for Offset Press
Authors: Guo Jun Zhong , Cai Tian Tian , Yang Jun Ping
Published: October 2011

In order to analyze the influence on the motion state of on-off pressure mechanism with flexible link of offset press, pneumatic on-off pressure was as the research object, the three-dimensional model of on-off pressure mechanism was established by using ADAMS, the kinematics simulations of the on-off pressure process was carried out, the curve of the angular velocity, angle acceleration and displacement between rollers of eccentric bushing in both rigid and the rigid-flexible coupled system was got, the significant basis of optimal design for on-off pressure mechanism was provided.
Calculation and Experimental Study of Fastening for Disc-Rotor
Authors: Lu Ming Jian , Geng Hai Peng , Xu Guo Hui , Lie Yu
Published: October 2011

Disc-rotor is composed of certain number of discs which are fastened as a single-shaft rotor by tie-rods. The rods must be very carefully tensioned in the course of rotor assembly to ensure a circumferentially uniform prestress, thus acceptable run-out value, as otherwise the rotor will be susceptible to vibrations particularly during start-up. Uniform prestress is also beneficial to improve the fatigue life of the rods. Initial preload for one rod is calculated and the appropriate tightening scheme is determined by finite element analysis, considering relaxation and elastic interaction. A kind of hydraulic tensioner is designed to assemble the disc-rotor. The experiment to fasten the disc-rotor by the tightening scheme above mentioned is presented.
Established and Experimental Study of ELID-Ultrasonic Honing System
Authors: Kuai Ji Cai
Published: October 2011

The electrolytic in-process dressing (ELID) technology was combined with ultrasonic honing technology and ELID-ultrasonic honing system was proposed. And the electrolysis parameters, ultrasound parameters, honing parameters reasonable were matched for ELID- ultrasonic honing system and the honing processing experiments were carried out. Studies have shown that parameters in ELID-ultrasonic honing system are independent without disturbing each other. Compared to traditional honing and ultrasonic honing, ELID-ultrasonic honing system has a significant advantage in machining accuracy, surface roughness, processing efficiency and so on. The feasibility of ELID- ultrasonic honing system is validated, which provided a new compound method of honing for ultra-precision honing machining.
Seismic Damage Analysis of RCC Gravity Dams Using 3D Nonlinear FEM
Authors: Li Ze , Zhang Li Xiang
Published: October 2011

The earthquake-resistance performance of gravity dam is an important indicator of dam safety. The earthquake-resistance performance of non-overflow monolith for Guanyinyan gravity dam is evaluated in this paper. First of all, the three-dimensional finite element model of dam is established by ABAQUS software. And then, the seismic response of gravity dam is analyzed by nonlinear finite element method, while the concrete damage plasticity constitutive model is adopted to describe the tensile characteristic of concrete. The seismic response and the damage evolution of dam are obtained. The results show that the dam has formed a crack-like band damage area at the end of earthquake, which are located in the dam along the dam-foundation boundary near the upstream face. At last, according to the results of simulation, the safety and the damage range are investigated.
Product Life Cycle-Oriented Cloud Process Management Research
Authors: Sun Li , Fan Jian Min , Ma Zi Qin , Wang Xiu Lun , Tan Hao , Sun Ai Qiao , Xu Ting Ting
Published: October 2011

Based on the philosophy of cloud computing and cloud manufacturing, cloud process management, a new intelligently network process management model, is proposed. And it is service-oriented, highly efficient, and knowledge-based. On the base of the study of contemporary process management, cloud computing, and cloud manufacturing, product life cycle-oriented cloud process management is researched with the survey of a large state-owned enterprise. The cloud process management is initially defined. The structure model of cloud process management is expounded. And the application mode of product life cycle-oriented cloud process management is initially put forward. These establish the foundation for further research.
Effects of Sb on Microstructure and Mechanical Properties of Magnesium Alloy ZA63
Authors: Wang Yao Gui , Li Quan An , Zhang Qing
Published: October 2011

The effects of antimony on the mechanical properties of magnesium alloy ZA63 have been investigated. The results show that the addition of 0.75wt.% antimony can cause the formation of Mg3Sb2 phase and enhance the mechanical properties of magnesium alloy ZA63 at room temperature and elevated temperature.
Inside Temperature Monitoring System of Marine Reefer Containers Based on RFID
Authors: Ji Jun , Han Hou De
Published: October 2011

The inside temperature monitoring system of marine reefer containers based on RFID is developed to make up for the shortcomings that the traditional system only depended on supply air temperature or return air temperature of the container to reflect the cargo temperature. The RFID temperature collection tags, the RFID reader and the software are designed and developed. Results of the inside temperature monitoring experiment showed that the system featured multi-points real-time monitoring, 100% readability, long reading distance and rapid reflection of the temperature variation, which may effectively solute the problem of cargo damage caused by uneven temperature distribution inside the container.
A Force-Feedback Assembly Method for Micro Parts Based on SRNN
Authors: Zhao Lin Hui , Zhang Jian Cheng
Published: October 2011

Force-feedback information is usful for micro-assembly system to enhence its contact sensing capability. On the basis of this view, a 3D force-feedback assembly method is proposed in this paper. It uses coordinate conversion to combine ideal pose data with pose error vector for assembly control. A kind of simple recurrent neural network (SRNN), whose weights is modified by using Levenberg-Marquardt (LM) algorithm, is applied to establish the mapping relationship between pose error vector and 6-DOF contact force/toque feedback form sensor. Experiments are carried out on backlash slider and base parts assembly to verify the performance of this method. It is proved that SRNN based on LM algorithm has good convergence ability and good fitting effects. Also,pose error can be accurately estimated and assembly searching times can be greatly reduced.
Ionizing Radiation Testing System for Emerging Semiconductor Materials and Devices
Authors: Hu Xin Li , Gui Jing Kang , Zhao Ce Zhou
Published: October 2011

A technical design and implementation method of a ionizing radiation testing system, which is especially applicable to conduct experiments of studying X-ray and γ-ray radiation effects in emerging semiconductor materials and devices, has been demonstrated by connecting components of a PC, a KEITHLEY 487, a HP 8110A, an Agilent 4284A, and a probe station together. The lead thickness of the lead shielding cylinder container is obtained numerically at least 2.1cm for safely holding a 1 GBq Cs137 γ-ray source.
Study on Establishing Regression Model to Predict Leg Girth of Young Women
Authors: Zhang Yi Jie , Yuan Fei , Sun Jie , Jin Juan Feng , Zou Feng Yuan
Published: October 2011

Using Martin Meter from Japan to measure 110 young women body. Using SPSS software for correlation analysis of measurement data, then selecting width, thickness and weight as elements used for establishing leg girth regression models. Adopting backward regression method to choose variable further, and establishing Multiple Linear regression model, Multivariate Quadratic regression model, Multivariate Cubic regression model to predict the girth of each part of leg which related to clothing. After testing and comparing the effect of each model, choosing out the best fitting modle for each part. The validity of modles were tested by randomly selecting 20 young women’s leg data,comparing with manual measurements, gaining satisfactory results. So as to provide an important technical support for human leg two-dimensional non-contact measurement and be further applied to research on medical compression stockings.
Research on Joint Simulation and Modeling of Electro-Hydraulic Position Servo System Based on Simulink and AMESim
Authors: Jin Bao Quan , Chen Dong Bing , Cheng Hang
Published: October 2011

The uncertainty of system parameters is not considered in traditional transfer function model of electro-hydraulic servo system, and then the accuracy of analysis is affected. Therefore the physical model of electro-hydraulic servo control system is established in simulation software AMESim platform. The system controller model is builded in the control simulation software Matlab/Simulink platform. The co-simulation interface technology is used to achieve joint simulation of electro-hydraulic servo control system.
FEM Analysis on a Rear Axle Housing Oil-Leakage Prediction of Four-Wheel Farm Transporters Based on COSMOS
Authors: Lu Sen Kai , Su Jian Huan , Liao Shu De , Su Jia Qiang , Wang Bo , Yu Liang , Jiang Yan Li , Wen Shou Hong
Published: October 2011

A finite element method (FEM) analysis based on COSMOS study with the aim to find the causes and effects of deformations in the interface between the rear axle housing and the central gear house of the four-wheel farm transporters during operation has been performed. The present design is analyzed with the aid of a mixed-fidelity, or mixed-grain, FE-model. Boundary conditions are defined on the bushings in front of the rear axle and on the air bellows behind the rear axle. The different load scenarios are represented by forces either on the wheels, the central gear or on the rear axle housing. The simulated results showed that with the worst combined load case for the different proposed design solutions suggested that modified design with a thicker flange and a removed stiffener would be significantly better than the present design; the simulated max displacement is about 0.5 mm and satisfied the design requirement. It indicated that the proposed method of finite element analysis was a good and efficient method predicts the oil leakage of rear axle housing, which can increased the knowledge of how oil leakage from the rear axle central gearbox can be controlled by design measures.
Effect of Black Plate on Growth Action and Corrosion Resistance of Sn-Fe Alloy Film
Authors: Li Jian Zhong , Tian Yan Wen , Li Ying , Wang Yu Cheng
Published: October 2011

Effect of black plate on growth action and corrosion resistance of Sn-Fe alloy film was investigated by means of metallurgical microscope, scanning electron microscopy (SEM), salt spray corrosion test and electrochemistry methods. The results show that the different modes of annealing and rolling have a remarkably effects on the surface morphology and grain size of Sn-Fe alloys. Crystalline grain of Sn-Fe alloy film for T4-CA or T2.5-BA is relatively continues, homogeneous and denser, but that for DR materials exists obviously surface inhomogeneity sizes and even void space of interweave. Rust spot easily generate on discontinuous alloy films or void space of interweave growth and gradually cover on the surface of Sn-Fe alloy films without corrosion damage. Corrosion resistance of BA materials is better than that of CA materials. Under the same annealing mode, corrosion resistance of DR materials is worse.
Optimization Design on Headstock of Shape High-Speed Vertical Machining Center
Authors: Zhang Chun , Li Zhi Yuan
Published: October 2011

Optimization design was a technology that searched and determined the optimal design. Parametric model of headstock was established in Pro/E, and the parametric model was imported into the ANSYS Workbench. Then multi-objective optimization design was carried out in DesignXplorer module based on test technology, response surface that the combinations of design variables aimed at the objective function was obtained, the situation which design variables changes impacted on performance parameters from the response surface was viewed, a relatively ideal optimal design result was chosen. The mass of improved headstock was reduced, under the condition that performance in all aspects was not diminished.
The Motion-Overlap Scheme for Reducing the Time between Continuous Scans of Wafer Stage for Step-and-Scan Lithography
Authors: Pan Hai Hong , Chen Lin , Zhou Yun Fei
Published: October 2011

During the exposure process of a step-and-scan lithography, the transitional time between continuous scans does not produce production efficiency in which no scanning occurs. To minimize the transitional time and therefore to improve the productivity we introduce the motion-overlap scheme, which inserts a step-move between the overrun phase and the phase before exposure of next field along the scanning direction for wafer stage during the continuous exposure process. The simulation results show that the motion-overlap scheme enables the total time of two continuous scans of four different exposure field sizes reduce 8.28%, 7.11%, 5.87% and 4.53%, respectively, compared with the conventional motion planning method. This indicates that the theoretical derivation of motion-overlap planning method is effective.
The Research of Teaching Reform on Innovation Experiment Mode of Civil “Whole Process”
Authors: Guo Yong Chang , Li Li Juan , Xie Zhi Hong , Zhu Jiang , Xie Jian He
Published: October 2011

The “Whole Process” experimental model of experimental teaching was proposed in this paper to solve the problems in experiment curriculum of civil engineering. This experiment educational model has several advantages, such as closely related to the experiment content, the experimental instructors can work cooperatively, and the high efficiency of equipment use.
The Visual Sense Creation Strategy of Natatorium Arena which Consideration to Leisure
Authors: Zhang Wen Long , Liu Xiao Hui , Liu De Ming
Published: October 2011

The natatorium arena as a regular competitions and a swimming fitness place makes the formation of its users’ visual sensory to correspond with characteristics and regulations. Though the analysis of a design case—the Swimming Natatorium of Yueyang Sports Center , this article puts forward a design strategy of creating the visual senses of the swimming natatorium arena which gives consideration to both competition events and leisure.