bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Compression Behaviour of AZ31 Magnesium Alloy at Room-Temperature
Authors: Sun Jia Le , Li Rui Chun , Quan Gao Feng , Liu Zhao Ming
Published: February 2012

The microstructure, surface morphology, compression properties, deformation behaviour and strain hardening exponent of as-cast and as-extruded AZ31 Mg alloy after different annealing treatments were investigated. The results show that the compression properties are great different between cast AZ31 alloy and extruded AZ31 alloy. Extruded AZ31 alloy is discontinuous yield and on the surface no signs of damage have been observed; on the contrast, cast AZ31 alloy is continuous yield and shows wavy patterns, and the surface cracks can be easily found. In addition, there is a linear relationship between the strain hardening exponent in first deformation stage and the yield ratio. Further more, the twinning mechanism plays very different role in cast AZ31 alloy and extruded AZ31 alloy.
Adsorption of As (v) from Water by Activated Aluminum Oxide
Authors: Zhang Da Lei , Qiao Fan , Lv Mou , Sun Ying Jie , Guo Qing Yuan
Published: February 2012

In this paper the adsorption properties of activated aluminum oxide (AAO ) to As(V) were researched. The effect of operating factors such as pH, contact time and initial As(V) concentration was investigated and the optimum operating conditions were established. Experimental results indicated that the optimal pH value adsorption of As(V)by activated aluminum oxide was from 4 to 6, and the optimum initial pH values was 5.5.The adsorption equilibrium was achieved within 5h.The adsorption capacity for As(V)increased with increasing concentration and the adsorption date was well fit by the Langmuir isotherm model. It is believed that activated aluminum oxide (AAO) is environmentally acceptable and industrially application for utilization in arsenic-containing wastewater treatment.
One-Pot Synthesis of Mesoporous MCM-41 with Different Functionalization Levels and their Adsorption Abilities to Phosphate
Authors: Huang Wei Ya , Yang Jun , Zhang Yuan Ming
Published: February 2012

Ethylenediamine (EDA) functionalized mesoporous MCM-41 particles displaying various functionalization levels have been prepared by one-pot method. The prepared samples were treated with Fe(III) to form cationic complexes inside MCM-41 pores (MCM-41-NN-Fe-x%, x=10, 20 and 30) for trapping phosphate from water. The prepared adsorbents were characterized by XRD, BET, TGA and elemental analysis, and their phosphate adsorption performances were studied. The results showed that the phosphate removal rate of all the prepared adsorbents were higher than 95% at the initial phosphate concentration of 2 ppm. Additionally, the Langmuir model was used to simulate the sorption equilibrium, and the results indicated that the experiment data agreed well with the Langmuir model. The maximum adsorption capacities calculated from the Langmuir model increased with the increase of diamino loadings in adsorbents, and the maximum adsorption capacities of MCM-41-NN-Fe-30% was 52.5 mg/g.
The Wear Mechanism Comparison between MgO-Based Chrome-Free Brick and MgO-Cr2O3 Brick in the Lower Part of RH Vacuum Degasser
Authors: Yin Guo Xiang , Li Yong , Chen Jun Hong , Gao Xin Kui
Published: February 2012

The damage and improvement mechanism of rebonded MgO-Cr2O3 brick and MgO-ZrO2 brick used in the lower part of RH vacuum degasser were studied. The results show that the main damage of rebonded MgO-Cr2O3 brick is structure spalling because of the penetration of slag. MgO-ZrO2 brick has characteristics of high direct-bonding degree, small air permeability and making the viscosity of penetrated slag increased by means of ZrO2 absorbing CaO in slag to form CaZrO3 or ZrO2 solid solution, which make the degree of slag penetration decrease and improve the structure spalling resistance. MgO-ZrO2 brick has the defect of poor thermal shock resistance in use, the incorporation of MgO-rich spinel into MgO-ZrO2 brick significantly improved both thermal shock resistance and hot modulus of rupture because of the formation of eutectoid structure of grain-refining spinel and zirconia, which also improved structure spalling resistance because air permeability was decreased to 5% of MgO-ZrO2 brick
Intelligent Job Shop Scheduling in Auto Blanking Plant
Authors: Cheng Nian Sheng
Published: February 2012

Job shop scheduling belongs to the large class of NP-complete (nondeterministic polynomial time complete) problems and the complexity of job shop scheduling characterizes many real-life situations. In auto blanking plant, intelligent scheduling system is needed to deal with the automation of production. The core structure of job shop scheduling system is designed. The scheduling rules such as mission-critical priority rule, first come first serve rule, the highest task priority rule and the urgent tasks priority rule are built with the definitions of express tasks, urgent tasks, middle urgent tasks and normal tasks according to the time features of tasks. The heuristic optimization algorithm is designed to follow the above rules. The intelligent logistics management system is built to optimize job shop scheduling in auto blanking plant.
Study on Chain Extension and Modification of Poly(Lactic Acid) by Isophorone Diisocyanate /Polyethylene Glycol
Authors: Zhang Zhao , Fan Guo Dong , Yang Hai Yan
Published: February 2012

Poly(lactic acid)(PLA)was end-capped by isophorone diisocyanate(IPDI) to get PLA-IPDI under the condition of temperature of 176°C and pressure of 0.090 MPa for 13 mins, and then the PLA-IPDI was chain-extended with different molecular weights polyethylene glycol (PEG)-400, PEG-600, PEG-800, PEG-4000 and PEG-6000 to produce a series of block copolymer PLA-IPDI-PEGs. when n(–OH)/n(–NCO)=1.5:1, the molecular weight of PLA-IPDI is maximum. All the copolymer PLA-IPDI-PEGs were characterized by GPC, FTIR, DSC and contact angle testing. The results show that the polymeric degree of PLA-IPDI-PEG-800 is the best and its molecular weight is the biggest. Tg of PLA-IPDI-PEG-800 is the lowest and its hydrophilicity is better than the others modification PLA-IPD-PEGs and pure PLA.
Simulation Analysis of Drive System of Wind Turbine Gearboxes
Authors: Liu Zi Xu , Chen Fu Kun , Wang Bo , Zhou Guo Dong , Yu Tian Biao , Wang Wan Shan
Published: February 2012

Based on three dimensional modeling software Solidworks, the physical model of 2MW wind turbine’s gear box is constructed and transferred into ADAMS, and then the virtual prototype model of the gearbox is established by adding constraint and load. According to the working state of the gearbox in different wind, the dynamic simulation is carried out, obtaining the revolution of the output shaft and mesh force of all gears. The simulation results compared with the theoretical values to verify the accuracy of the simulation.
An Optimized Dynamic Join Query Method for Multi-Hop Wireless Sensor Networks
Authors: Ge Mao Song , Fu Chun Yan , Tai Xue Li , Guo Ji Ping
Published: February 2012

Recently some existing works have developed computing Join query technology over wireless sensor networks. But these techniques are static, and are only used in special application designated connection rate. In order to construct the data query method that suits environment, this paper proposes an optimization join query method that is applicable to limited bandwidth context. The dynamic join optimization problem in multi-hop wireless sensor network is resolved and a cost-based model is designed. This algorithm can predict the selectivity in advance, and can optimize the pairs of data streams. Experimental verification on standard data sets verified the effectiveness of the proposed method.
Trapping Yeast Cells on PDMS Micropillar Array
Authors: Zhang Wei , Zhang Bo , Zhang Yu Long , Han Da , Zhou Yong Liang
Published: February 2012

A selectively yeast cell trapping and arraying method was presented, utilizing PDMS micropillar array combining with chemical adhesion. Yeast cells were trapped on the top of micropillar array while swept on the flat area for the pinning of liquid/surface contact line on the micropillars and moving on the flat surface. And the modification of poly-L-lysine on the yeast cells improved the immobilization of cells on the surface of PDMS surface. Both of simulation and experiment results shows that by adjusting the diameter of micropillars, the number of yeast cells on each pillars could be controlled. Single cell array was formed with a 8.3 μm micropillar array, and majority yeast numbers of 3,4,5 was got for the 13.7 μm、18.0 μm and 18.8 μm micropillar array.
Preparation and Properties of Pullulan Composite Films
Authors: Yan Jian Jun , Li Zheng , Zhang Jian Fei , Qiao Chang Sheng
Published: February 2012

In the paper, preparation and properties of pullulan composite films were studied. Several kinds of materials (glass, iron, steel, propene polymer and polyvinyl chloride plates) were chosen for preparing films. The results showed that the steel plate was the most suitable material for preparing film. The tensile strength of pullulan film was significantly reduced when the drying temperature was higher than 50°C. The time of dissolution observably decreased, whereas water vapor permeability increased with increasing drying temperature. Pullulan film has higher tensile strength, better water barrier properties, shorter solubilization time and lower elongation at break than those of hydroxypropylmethylcellulose film, respectively. The composite film (Pullulan and hydroxypropylmethylcellulose) with weight ratio (1/2) has higher tensile strength, better water barrier properties, longer solubilization time than those of other ratios. Difference properties of films could be obtained in different weight ratio (Pullulan and hydroxypropylmethylcellulose).
Influence of the 2,2-Dimethylol Propionic Acid Content on the Structure-Properties of Waterborne Polyurethane
Authors: Wang Zheng Xiang , Wang Jian Long , Gu Li Zheng
Published: February 2012

Abstract. Series waterborne polyurethane (WPU) dispersions with different 2,2-dimethylol propionic acid (DMPA) content were synthesized by the prepolymer method. Different configurations in the waterborne polyurethanes were obtained by varying the DMPA content. The structure-properties of the WPU dispersions were characterized by Fourier transformed infrared spectroscopy, Thermogravimetric analysis, differential scanning calorimetry, Zetasizer nano etc. The results indicated that the amount of urethane and urea groups (hard segment) increased in the structure of WPU chains with the increasing content of DMPA. In the meantime, the degree of micro-phase separation increased. On the other hand, as the content of DMPA increased, the particle size, the thermal stability and T-peel strength decreased. Moreover, the increased content of DMPA resulted in higher tensile strength and hardness, but lower elongation at break.
The Influence of Microstructures on the Corrosion Properties of X80 Pipeline Steel in Near-Neutral pH Soil
Authors: Luo Jin Heng , Xu Cong Min
Published: February 2012

The influence of microstructures with different heat treatments on corrosion properties of X80 pipeline steel was investigated in near-neutral pH soil using electrochemical measurement and surface analysis(SEM, EDS and XRD). The results showed that the microstructure of X80 steel affected the properties of corrosion product layers. Generally, X80 steels with heat treatments had a higher corrosion rate than the as-received steel. The increase of pearlite content enhanced the corrosion of ferrite through a galvanic effect. The appearance of upper bainite and martenite increased further the activity of the steel. The corrosion product layer formed on as-received X80 steel was compact and complete, provided an effective protection to the underneath steel. However, the corrosion product layers on the heat-treated X80 steels were generally inhomogeneous, loose, porous and defective, and provided minor protectiveness. The cathodic/anodic reactions of X80 steel are dominated by the oxygen reduction and formation of iron oxides that deposit on the steel surface which was through a physical block effect to afford the protection.
Towards Web-Based Adaptive Learning Assistant Approach
Authors: Wang Hua
Published: February 2012

With consideration of the impact on adaptive teaching strategy of constructivist learning theory, we put forward essential elements of the smart learning system to achieve individualized teaching. Adaptive learning is coined as a learning method through existing knowledge and experience of learners and interacting with the adaptive learning system to obtain knowledge and gain the ability. An adaptive learning framework is presented by employing fuzzy method and rule reference model. By employing Cognitive Knowledge and Self-feedback, the proposed approach improves the efficiency of learning.
The Application of Infrared Sensors Integrating Stepper Motor Based on C8051F120
Authors: Xin Zheng Hua , Hu Liang Yi , Li Hong
Published: February 2012

This work uses infrared physical properties to induce objects. And test results determine whether stepper motor wil run. The infrared sensor is not direct in contact with the measured object. There is no friction. The system has high sensitivity and accuracy. So it can be applied in production lines and to monitor the status of devices which is sensitive of temperature, such as engines.
Reserach on the Feeding Model and Residual Error Model of a New Polishing Device
Authors: Li Ying Chun , Lin Jie Qiong , Lu Ming Ming , Li Feng
Published: February 2012

Based on a new polishing device, the feeding model and residual error model are established according to the movement relationship of the polishing tool and the workpiece in the process. From the feeding model we can get the feed of the polishing tool in the process. And the residual error model can be used to obtain the scallop height after polishing and we can adjust the polish-step length rationally to improve machining accuracy. The two models can provide the theory basis for polishing aspheric. It confirms the exactitude and effectiveness of the two models through the simulation analysis results.
Slice Spectrum of AR Trispectrum for the Fault Diagnosis of the Hydraulic Control Valves
Authors: Chen Bing San , Jiang Ji Bin , Li Chun Yu
Published: February 2012

Slice specturm is investigated as data mining techniques in the fault diagnosis of hydraulic control valves in this paper. The characteristics of vibration signals obtained from the control valves have been extracted by means of analyzing the 2-dimensional of trispectrum, with the main goal of detecting a possible working condition including the normal and fault conditions. The experimental analysis shows that there are distinct bump values in the center of the two-dimensional slices of trispectrum space in the fault conditions, on the contrast, the bump values disappear in normal condition. The experimental and theoretical results have indicated that trispectrum is a more suitable tool for diagnosing the faults of the hydraulic control valves.
Electronic Effect of Fluoro Substituents on Chromium(III) Complexes bearing β-Diketiminate Ligands for Ethylene Polymerization
Authors: Xie Guang Yong , Zhang Xiang , Xu Xiao Hang , Li Ting Cheng , Zhang Ai Qing
Published: February 2012

A series of new chromium(III) complexes bearing fluoro-substituted β-diketiminate ligands have been synthesized and characterized by IR and elemental analyses. When activated by modified methylaluminoxane (MMAO), these Cr complexes exhibited moderate or high activities for ethylene polymerization (up to 370 g.mmol-1.h-1). Various reaction parameters such as reaction temperature and Al/Cr ratio were investigated in detail. Further more, it was found for the first time that the catalytic behaviors of Cr complexes can be greatly influenced by the electronic effect of fluoro substituents. The introduction of electron-withdrawing fluoro groups to ligands can improve the catalytic performances compared with those bearing alkyl groups, but incorporation of more fluoro atoms would then decrease the catalytic activities.
Real-Time Monitoring Device and Method of the Compression Stress of Rubber Materials
Authors: Yang Ming Yuan , Zhang Wei Fang , Chen Yu , Zhao Li , Ding Mei Li
Published: February 2012

An accelerated ageing test equipment with the pressure transducer and digital indicator is designed in the light of the features that the rubber seal used in aviation industry always stand compression stress. This equipment can do real-time monitor on the compression stress of rubber materials in accelerated ageing test. The stress measurement range is 0～980 N, and the temperature fluctuation range is 0～200°C. With this equipment, the compression stress relaxation and stress permanent set can be tested and the relationship between them in 100°C can be found.
Biosorption of Food Dye onto Gelatin Microspheres: Equilibrium Isotherm and Thermodynamic Analysis
Authors: Xue Hai Yan , Han Fang , He Bao Yuan
Published: February 2012

Gelatin microspheres (GMSs) were prepared by the inverse suspension cross-linking reaction, using glutaraldehyde as the cross-linking reagent. The GMSs was characterised by scanning electron microscopy and FTIR spectra. Langmuir, Freundlich isotherms were used to analyze the adsorption equilibrium of the food red 3 (FR3) onto GMSs and related correlation coefficients have been determined at different temperatures. The adsorption data fitted well with Langmuir isotherm model and the adsorption of FR3 onto GMSs is a favorable process. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° have also been evaluated and it has been proved that the adsorption process is spontaneous and endothermic.
Effect of Gamma Irradiation Crosslinking on PA6 Fibers
Authors: Zhu Shi Feng , Shi Mei Wu , Dai Guo Liang
Published: February 2012

Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.
Analysis of Wet Etching Characteristics of a-IGZO Thin Film
Authors: Chen Long Long , Li Xi Feng , Shi Ji Feng , Zhang Hao , Li Chun Ya , Zhang Jian Hua
Published: February 2012

Amorphous InGaZnO (a-IGZO) films are deposited on the glass substrate by RF sputtering and the influence of wet etching of a-IGZO films, etching rate, over etching features and TFT structure chose are investigated. The results show that Oxalic acid is best chose for IGZO film etching for side etching is about 0.1um , etching rate is 7.42 A/s which is easy to control and taper angle is acute. The traditional G-I-D type structure has been confirmed is not fit for the condition where the IGZO based TFT manufacture. G-D-I structure is tested and can be used in the TFT array manufacture.
Preparation and Characterization of TiO2 Photocatalytic Thin Film Prepared by Sol-Gel Dip Coating
Authors: Wang Jiao Jiao , Zheng Kai , Rüssel Christian , Liang Wen
Published: February 2012

Titanium dioxide thin films have been prepared from tetrabutyl-orthotitanate solution and methanol as a solvent by sol-gel dip coating technique. The thermal properties of TiO2 gel were analyzed by thermogravimetry and differential thermal analysis (TG-DTA). Structural properties of TiO2 thin films at different heat treatment temperatures were analyzed by X-ray diffraction (XRD), Infrared Raman spectroscopy and scanning electron microscopy (SEM). The results show that the TiO2 thin films crystallize in anatase phase at 400 °C and the crystallinity of anatase phase was improved with increasing temperature. The TiO2 thin films crystallize into the anatase-rutile phase at 600 °C and further into the rutile phase at 800 °C. The photocatalytic performance of TiO2 film was tested for the degradation of 2×10-5 mol/L Rhodamine B. The degradation of Rhodamine B solutions reached 0.9×10-5 mol/L after irradiated for 8 h under UV light. The TiO2 thin film exhibited relatively high photocatalytic activity towards degrading Rhodamine B.
Wuxi Hui-Quan Substation Three-Dimensional Modeling and GIS System Implementation
Authors: Liu Qiu Long , Hu Wu Sheng
Published: February 2012

3D (three-dimensional) laser scanning can be used to collect spatial location of points rapidly and abundantly, and obtain three-dimensional coordinates of the target surface, which provides new technical means for the rapid creation of three-dimensional image model of the object. A three-dimensional modeling study on spatial object was carried out using the spatial data captured via ground-based 3D laser scanner in the Hui-Quan substation. The experiment result shows that rapid 3D visualization modeling on buildings can be achieved via the methods and procedures mentioned above. It has solved that the traditional equipment and the measuring technique is insufficiency in the special domain. It will bring the application mode and technical advantage, which tradition mapping way can not have. A platform for three-dimensional model of the substation can be achieved for the resources, landscape, security, environmental management and other social resources of digital, networked and dynamic visualization.By taking WuXi Hui-Quan Substation as the research object, building 3D models by Three-dimensional laser scanning technology and embedding 3D-GIS, Meanwhile, combining existing 2D-geographical spatial data, data preparation, construction of 3D-model, 3D-visualization, space inquiry and analysis, information management are given systematic analysis and research. In the end, in the programming environment of C#2.0, Skyline software is employed with its open Application Programmed Interface (API), which constructs 3D-scenes and 3D-terrain models of WuXi Hui-Quan Substation and comes to the realization of 3D-visualization, property inquiry and edit of Attribute data.
An Integrated Evaluative Function and Water Bloom Predicting and Prewarning System
Authors: Liu Zai Wen , Wang Xiao Yi , Wu Qiao Mei
Published: February 2012

An integrated evaluative function and prediction model and prewarning system for water bloom in lakes based on Elman neural network is proposed in this paper, in which main influence factor of outbreak of water bloom is analyzed by rough set theory. The study of the function involves some aspects: algal average activation energy of photosynthesis, integrated nutritional status index, and transparency, which are considered from the microcosmic level, the macroscopic level and the intuitionistic level respectively. The values of the function are classified properly. Combined with the basic features of outbreak of water-bloom, Elman network is studied from the angles of theory and experiment and a water-bloom prewarning system in short term based on Elman network is established. The results of simulation and application show that: Elman neural network improves the algorithm of BP neural network, it has long-term prediction period, strong generalization ability， high prediction accuracy; and needs a small amount of sample and this model provides an efficient new way for short-term water bloom prediction, And approaching ability of Elman network is more superficial than common static networks and its velocity of convergence is faster.
Studies of Ti-15V-3Cr-3Al-3Sn after Thermohydrogen Processing
Authors: Huang Rong Tan , Tsay Pei Chiao , Chen Wen Han
Published: February 2012

Ti-15V-3Cr-3Al-3Sn, β-phase titanium alloy, is subjected to study the microstructure and mechanical behavior after thermohydrogen processing. It aims to study the relationship between microstructure modification and notched tensile test at room temperature. Meanwhile, the notched tensile test and fracture features of Ti-15-3 alloy without THP is also discussed. It follows that the hardness of Ti-15V-3Cr-3Al-3Sn would be clearly enhaced up to Hv 499 after thermohydrogen processing due to grain refinement. Besides, the notched tensile strength of the as-received specimen is about 904 MPa, and is increased to 959 MPa after THP, that is, Ti-15-3 alloy after THP shows higher hardness and notched tensile strength than as-received alloy. The enhanced high hardness does not induce a significant notched embrittlement effect.
A Fractal Study on Collective Evolution of Short Fatigue Cracks under Various Strain Amplitudes
Authors: Wang Zheng , Xie Wei Yun , Wang Lu , Liu Jian Xiong
Published: February 2012

The fractal dimension is a basic parameter to indicate the random self-similar shape and phenomena. The damage process is the result of co-effect of all the cracks, which shows a good collective behavior and random statistical complexity. The collective evolution of short fatigue cracks was experimentally studied through cylindrical specimens with annular notches with respect to the variation of nominal strain amplitudes. The maximum between-class variance method (Otsu's method) was adopted for the denoised image binarization and the fractal dimensions were obtained. The results show that: the collective behavior of short fatigue cracks possesses good fractal characteristics; as the evolution of the short fatigue cracks, fractal dimensions underwent two stages: a primary stage of high growth speed, a relatively stable stage of almost to zero growth speed; the critical cut-off point at about 30% of the fatigue life according to the experimental results can be used to represent a threshold value of the MSC and PSC of short fatigue cracks.
An Investigation on the Shear Toughness for Sn/3.0Ag/0.5Cu and Sn/37Pb Solder Ball Joints
Authors: Hsu Chao Ming , Hung Tsung Pin , Lin Ah Der , Kuang Jao Hwa
Published: February 2012

Both experimental and numerical analyses into the shear toughness parameter for Sn/3.0Ag/0.5Cu and 63Sn/37Pb solder ball joints are performed. The ball shear tests are conducted at the loading speeds of 200μm/s and 300μm/s using ball joint specimens with diameters of 300, 600 and 760 μm. The failure behavior of the solder joints is quantified in terms of their fracture toughness. The results show that the shear toughness increases with an increasing solder ball diameter. Furthermore, it is shown that the Sn/3.0Ag/0.5Cu solder ball has a greater ductility than the eutectic 63Sn/37Pb solder ball. It is found that the shear toughness with great differentiability is relatively insensitive to the loading speed, and is therefore a suitable parameter with which to evaluate the ductility of solder ball joints in ball shear tests. Finally, the finite element analysis is further employed in the simulation with the software of MSC, Marc. Numerical predictions have good agreements compared with experiment ones.
Correlation between NDT and Tensile Strength of Structural Larch Sawn Lumber
Authors: Chen Yong , Li Wei Na , Wang Xi Jun , Shen Shi Jie
Published: February 2012

With Larch timber as the experimental subject, according to the visual grading-related rules in ASTM D245, four-point bending edge-wise in ASTM D4716-05 and axial strength in tension, the regression analysis is conducted; investigate the correlation relationship of Kus, E4s and σw. The result demonstrates that the combination of visual grading, density and four-point bending MOE, the predict of the parallel tensile strength will be more exactly whose correlation coefficient is 0.750.
The Influence of Pore Defects Distribution Characteristic on Casting Service Performance and Fatigue Life
Authors: Rao Lei , Zhu Lian Bing , Hu Qi Yao , Li Xiao Long
Published: February 2012

Pore defect is a kind of typical non-continuous casting defect. It always brings local stress concentration and fatigue crack. The distribution charactersic of pores has greatly influence on the fatigue life. In this study, distribution characterstic of pore has described by pore to surface distance (S) and pore dispersion coefficient (r). By numerical simulation method, stress and fatigue life distribution law in the test bar have been studied under different and . Under the same load condition and pore volume fraction, the stress concentration factor (Kt) will increase and fatigue life will decrease following pore to surface distance (S) decreasing and dispersion degree (r) increasing within a limitation. The influence of pore to surface distance (S) is more obvious than the pore dispersion coefficient (r) on fatigue life of the casting.
Failure Prediction of Laminated Composites with the Hole under in-Plane Compressive Loading
Authors: Yang Yin Huan
Published: February 2012

Failure process of laminated composites with the hole under in-plane compressive loading is performed by progressive failure analysis method. A modified form of Hashin’s failure criterion by Shokrieh is used to investigate the failure, where a sudden degradation model is proposed to reduce engineering material constants. The numerical study of laminated composites is implemented in ANSYS Parametric Design Language (APDL). The initiation and propagation of local damage and response of laminated composite structures from initial loading and ultimate failure are predicted. The model has been validated by comparing numerical results with existing experimental results. And then failure analysis of specimen fabricated from M40J/Ag80 on influence of the hole under compressive loading has been performed by the proposed model.
Analysis on Test Method of Metal Magnetic Memory Mechanism of Ferromagnetic Materials Based Plastic Deformation
Authors: Gou Rui Bin , Zhang Yi Liang
Published: February 2012

A new test method of metal magnetic memory (MMM) was designed and was applied to study the relationship between MMM signals distortion and uneven plastic deformation so as to obtain the direct evidence of the result that MMM signals change unevenly causing by the unevenly plastic deformation in tensile test. Macro magnetic memory measurement were done to capture the occurrence time and position of MMM signals’ distortion during the period of plastic deformation, strain measurement were done before each MMM measurement and micro slip lines were observed after each time when MMM signals were measured to capture the occurrence time and position of plastic deformation. Then direct evidence can be obtained by compared the consistency of the time and positions. Preliminary tests were done to prove the rationality and feasibility of the new test method. The results show that the evidence can be obtained effectively and change law of MMM signals were reproduced by this new test method.
Solubility Product of MoC with NaCl Type Cubic Crystal Structure in Iron
Authors: Cao Jian Chun , Zhou Xiao Long , Deng Lei , Yong Qi Long , Sun Xin Jun , Liu Qing You
Published: February 2012

In this paper, firstly, the equilibrium solubility product formula of MoC with NaCl type cubic crystal structure in ferrite has been deduced by thermodynamic method, according to the free energy change of molybdenum and carbon dissolved in ferrite and the formation energy of MoC. On the basis of deducing activity coefficients of Mo in iron, the solubility product formula of MoC in austenite has been obtained according to the relationship of solubility product of MoC in austenite and ferrite. Finally, the solubility products for MoC and NbC in iron are compared. The solubility product formulae of MoC deduced would play an important role in related theoretical research and practical production.
Damping Properties of AZ91D Magnesium Alloy with Y Addition
Authors: Chen Hang , Dong Xuan Pu , Xiong Xiao Qing , Ma Rong , Chen Shu Qun , Fan Zi Tian
Published: February 2012

The influence of Y on the microstructure and damping capacity of AZ91D based alloys was investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and dynamic mechanical analysis. The results show that, with increasing Y content, the grain size of α-Mg matrix decreases tremendously and the distribution of β-Mg17Al12 phase is transformed from discontinuous network to fine particles. Meanwhile, a needle-shaped Al4MgY phase mainly distributing at the grain boundaries is identified. The damping capacity of the studied alloys shows sustained enhancement with increasing temperature. As to the strain dependent damping capacity, with the increase of Y content, the damping value of AZ91D alloy decreases gradually before Y content reaches to 0.5wt.%, and fluctuates when Y addition is between 0.5wt.%~0.9wt.%. G-L dislocation model was employed to explain the effects of parameters on damping capacity of magnesium alloy.
Comprehensive Influence of Cr and Si on Hardness and Wear Resistance of Cold Roll Steel
Authors: Xu Jing , Yang Yi Tao
Published: February 2012

To improve the service performance of Cr-series steel for cold roller, the combined effects of chromium and silicon on hardness and wear resistance of cold roll steel had been studied in this paper on the basis of MC5 cold roll steel. The results showed that, with increasing Si content the hardness tended to decrease when Cr content was about the same. The hardness was the highest and the wear resistance was the best when Cr content was about 6.7% and Si content about 0.6%. The reason for this found by microscopic analysis was that the carbide size was the finest and carbides were the most dispersively distributed. Meanwhile, the amount of carbides was also the largest.
Crosslink Effects of Octavinyl Polyhedral Oligomeric Silsesquioxane on the Mechanical and Thermal Properties of Polyacrylate Nanocomposites
Authors: Su Chang , Zhao Cun Bin , He Pan , Zhang Cheng
Published: February 2012

Poly(butyl acrylate-co-methyl methacrylate-co-octavinyl polyhedral oligomeric silsesquioxane) (OVPOSS-P(BA-MMA)) nanocomposites were synthesized by emulsion polymerization. The structures of nanocomposites were characterized by Fourier transform infrared spectrum (FTIR) and solubility experiment. It was shown that the network structures have been formed during the copolymerization. Dynamic mechanical analysis (DMA) was used to investigate the dynamic mechanical and thermal properties. The data indicate that the crosslinking density apparently affects the mechanical and thermal properties of OVPOSS-P(BA-MMA).
Effect of Aging Condition on the Mechanical Properties of an Al-Cu-Mg-Ag Alloy
Authors: Gu Yan Xia , Liu Zhi Yi , Yu Di Er , Zhou Xuan Wei , Chen Qian Qian , Jiang Lin
Published: February 2012

The effect of aging condition on elevated temperature tensile strength and microstructure of an Al-Cu-Mg-Ag alloy was investigated. The tensile strength of 165°C/14h samples was greater at room temperature and 200°C, while the 165°C/2h samples got superior tensile properties at 250°C and 300°C. The microstructure contained mainly of Ω plates in both conditions, and as the increasing of exposure temperature, the coarsening of Ω precipitates occurred by the solution of small particles and the growth of large particles, resulting in an increase in the average particle size, and the decrease in the number of precipitates.
Effects of Hot Deformation Process on the Microstructure and Hardness of AZ80 Magnesium Alloy
Authors: Huang Xiao Ting , Cai Gang Yi , Qiu Wen Biao
Published: February 2012

AZ80 magnesium alloys were deformed at different temperature (270°C, 300°Cand 330°C)with different deformation ratio from 10% to 50%. The influence of varying the deformation temperature and ratio on the microstructure and hardness of AZ80 magnesium alloy was studied. The experimental results show that the hardness increased with the increasing of deformation and the hardness is up to the peak value with 40% deformation at 300°C. The microstructure was homogeneous and the grain was refined after hot deformation.The roles of both deformation strengthening and dispersition strengthening were to im prove the mechanical property of AZ80 magnesium alloy.
Application of Centroidal Voronoi Diagram in Numerical Model of Microforming Process
Authors: Lu Hai Na , Wei Dong Bin , Jiang Zheng Yi
Published: February 2012

Grain size, shape and orientation play an important role on the deformability of micro workpiece as the geometrical dimensions approach to a characteristic scale in micro-forming process. This paper addresses the three-dimensional (3D) finite element (FE) model with weighed centroidal voronoi diagram (WCVD). Steady-state grains are generated when the voronoi generating points approach the grain centroid utilising a simplex integration algorithm. As a result of the centroidal process, the topological features of grains advance the uniform and steady state gradually, which may cause a decrease of interfacial energy. The grain size distribution is compared between the 3D domain and random cross-sectional plan. The effects of centroidal process on the distributions of grain size and number of grain corners, facet and edge are analysed.
Study on the Interface Parameters of Composite Materials with Consideration of the Effect of Thermal Stresses
Authors: Xie Zhi Min , Weng Yan Yan , Pu Shou Wu
Published: February 2012

How to design the interface is a fundamental issue for the composite materials. Although a little work was concerned with the mechanical design of the interface, the effect of the initial thermal stresses has not been taken into account in those studies. While the thermal stresses due to the manufacturing process and the difference in coefficient of thermal expansion between matrix and reinforcing phase, do play an important role in the properties of the composites. In terms of a concept of the neutral inclusions that do not disturb the prescribed uniform stress field in the surrounding elastic body, the interface parameters are studied with consideration of the effect of an initial thermal stress field in this paper, indicating that the effect of thermal stresses may be eliminated by the design of interface parameters.
Comparative Study the Effect of Different Raw Powder on Foaming Process during Sandwich Rolling
Authors: Zhang Min , Chen Chang Jun , Zu Guo Yin , Yao Guang Chun
Published: February 2012

An element powder-Al plate sandwich rolling processing is proposed for preparation of aluminum alloy foam sandwich with a metallurgy bonding interface. By comparing the deformation characteristic and it’s effect on foaming processing by using Al, Si elements and AlSi alloy powder, and to explore the effect of different powder as raw material on preparing foam aluminum sandwich. It was found that the densification of precursor using element powder is higher than using alloy powder, and rolling deformation resistance is smaller. And it was more suitable to manufacture different types of foam core material by using element powder as raw material.
Research on Segregation at Interface in Al2O3/Al-Cu Composites
Authors: Liu Xiao Mei , Liu Zheng
Published: February 2012

Al2O3/Al-4%Cu alloy composites were manufactured by squeeze casting. Segregation at the interface between fiber and matrix in the composites was researched. The results indicated that at the end of solidification of the composites, the change of the solute in the surplus liquid phase resulted in the type of matrix alloy being changed because of the selecting crystallization, and the segregation at the interface was finally formed. There might be the dual effect of the segregation on structures and property of the composites.
Thermodynamic Application of Predicting the Effect of Trace Element of Ag on Reinforced In Situ Particles in Al-Cu/TiB2 Composites
Authors: Yu Di Er , Liu Zhi Yi , Gu Yan Xia , Xia Lin Yan , Zhou Yun Dong , Wen Li
Published: February 2012

Using the Wilson equation and an extended Miedema model, the thermodynamic effect of silver on the stability of reinforced particles in the Al and Al-Cu matrix were evaluated. The formation of Al3Ti, AlB2, and TiB2 phases are promoted with the addition of silver atoms in Al matrix. Minimum values of excess free energy of reinforced particles were found in the Al-Cu-Ti-B-Ag system. Evidently, Low content of silver atoms actually has the profound effect in promoting the reinforced particles in Al-Cu matrix.
Influence of Annealing Treatment on Precipitation of β-Mg17Al12 Phase of AZ80 Magnesium Alloy
Authors: Zhang Ju Mei , Wang Zhi Hu , Jiang Bai Ling , Chen Zi Shan , Niu Li Bin
Published: February 2012

The microstructure and element distribution of AZ80 magnesium alloy as-cast and after annealing treatment were studied by OM, SEM, XRD, EDS and TEM. The results show that the coarse divorced eutectic phase distributed along the grain boundary dissolve into Mg matrix during the isothermal process at 415°C for 24h. During the cooling process of annealing treatment, the lameller-shape β-Mg17Al12 nucleated preferentially in the grain near the boundary, then grows towards the neighbor grains with longitudinal direction, which precipitated from magnesium solid solution as perlite-type precipitation. When cooled to room temperature, the lameller-shape β-Mg17Al12 was uniformly distributed in the matrix, and the lamellar spacing inside β phase is about 1-2μm.
Effects of Interface on Wear Resistance in Fiber Reinforced Composites
Authors: Liu Zheng , Liu Xiao Mei
Published: February 2012

The effects of the interface in alumina fiber reinforced Al-Si alloy composites prepared by squeeze casting on the wear resistance of the composites were studied. The results indicated that the fiber combined with the matrix well in the composites and had reinforcing effect on the alloy. The interface in the composites could hold back crack propagation, and the composites had the excellent wear resistance. The alloy elements in the matrix were favourable to forming the good interface to improve wear resistance of the composites.
The Monitoring Elements Structure of Process of Requirement Integrated & Dynamic Espial for Complex Products RMS
Authors: Ren Yi , Zhou Xuan , Yang De Zhen , Liu Lin Lin
Published: February 2012

Aiming at the disadvantages of traditional process of achieving the RMS requirements, which the less of monitoring points, hardly controlling this process and easily leading to the iterative design, etc. are included. A methodology, Process of Requirement Integrated & Dynamic Espial (PRIDE), for the achievement of equipment RMS requirements was proposed at first, and its framework was given subsequently. Then a set of elements structure of PRIDE, based on the monitoring space model of the overall system, overall process and overall properties (three-A), was built, which lay the foundation for the realization of the PRIDE in achieving equipment RMS requirements. Finally, a certain type of aircraft was taken as the case to verify the feasibility of the monitoring elements structure.
Hygrothermal Behavior of T700 and T300 BMI Used for Advanced Polymeric Composite
Authors: Wang Shuang , Zhang Wei Fang , Chen Yu , Wu Yu Fen
Published: February 2012

The mechanism of hydrothermal ageing was investigated for T700/ BMI 5428 and T300/QY8911 by studying its glass transition temperature, tensile/compressive properties, changes of surface morphology absorbed in water with 100°C temperature. Results show that the glass transition temperature getting lower with the rate of water absorption. The tensile/compressive strength of composite decreased in the humid and heat environments, although with the identical failure mode.
Predictive Maintenance through Condition Monitoring at Diffusion Equipment of a Solar Cell Manufacturing Environment
Authors: Nurhaiza Shahrir , Mohd Arrifin Mohd Khairol Anuar
Published: February 2012

This paper analyzes failures at diffusion equipments in a solar cell manufacturing. The history was gathered and analyze. This paper starts with prioritizing the frequent failures through Pareto Analysis and starts to discuss potential method to reduce its failure. The Root Cause Analysis with probability ratio was created by the team and they had identified potential Condition Monitoring. This diffusion equipment stores most parameter and process readings that makes the automatic Condition Monitoring possible. The Condition Monitoring on one of the parameter readings was implemented and it has shown a high reduction in that equipment failures.
The Synthesis of Eco-Friendly Silicone-Modified Polyacrylate Pigment Printing Binding Agent
Authors: Chen Jian Ping , Quan Heng , Shi Wei Li , Ni Li Jie , Lei Kai Chen , Zhang Jing , Li Xin Ping
Published: February 2012

The environment-friendly silicone-modified acrylate is made through the emulsion of the polymerization. Research shows that time of organic silicon prepolymerization, quantity of organic silicon graft copolymerization, catalysts and its dosage, dosage of the coupling agent have significantly effect on the acrylate adhesives polymerization process and performance of product. The polysiloxane can resistant to heat and is hydrophobic, breathe freely and feels soft smooth. It can improve the water resistance of the film, and stanning resistance, softness and significant flexibility and wet rubbing fastness and so on.
The Brazing of Copper Pipe and Aluminum Pipe Based on the 4R
Authors: Xia Tian Dong , Liu Xiao Li , Li Qing Lin , Yu Wei Yuan
Published: February 2012

The copper-aluminum pipe has been widely used in the refrigeration industry. With the increases of the scrap rate in electronic products, the recycle and remanufacturing of Cu-Al brazed joints becomes the focus. In this study, introduced the green welding, which will improve the recycle ability of the Cu-Al brazed joints from technological design source. The experiment results shows that it is possible to improve the remanufacturing and the mechanical properties of Cu-Al brazed joints with the appropriate lap length,and it complies with the green welding design concept when the lap length of Cu-Al brazed joints is 5 mm.
Study on Technology of Ultrasound-Microwave Assisted Improves Preparation of Porous Starch
Authors: Liu Zhong Dong , Yang Yong Mei , Liang Hui , Bi Li Zheng , Gong Beng Qian
Published: February 2012

Porous starch as a kind of high efficiency, non-toxic and safe new organic adsorbents are extensively used in food, medicine, agriculture, cosmetics, paper and other industries. Recently the preparation method is amylase in starch gelatinization temperature of less than hydrolysis. In the conditions of ultrasound (physics) and microwave (electromagnetic fields), we could improve the yield of the traditional method of enzyme hydrolysis corn starch. First, the results show that: the time at 45 min, microwave power 150W, ultrasonic power 400W, temperature 56°C, α-amylase enzyme quantity 8 U/g, glucoamylase and α-amylase ratio 6:1, citric acid buffer liquid pH 5.4, the absorption rate of porous starch is best. Ultrasonic- microwave improves the quality of customary enzymatic hydrolysis starch, by SEM observation, found that: There are a lot of table face holes which are uniform pore density, particle more complete.
PHC Pile Bearing Capacity and Application
Authors: Su Er Wei
Published: February 2012

This essay introduces the PHC pile of vertical bearing capacity, level of capacity, capacity and final pressure values, tensile properties, pile the stress mechanism, and the factors that influence bearing capacity, then the useful suggestions of how to design and construct are given. It has vital significance to direct engineer practice, optimize static-pressed pipe-pile foundation design.