bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction Control Method of Spot Welded Nugget Size Based on Finite Element Analysis of Thermo-Electricity Transient
Authors: Cai Hu , Zhang Peng , Wang Yuan Xun
Published: December 2011

Dual-phase steel is a type of sheet material newly developed to adapt to the lightweight and safety needs of vehicle. In this paper, 1.7 mm thick dual-phase steel DP600 was taken as the object of study, its resistance spot welding performance characteristics and welding mechanism was studied in detail. The thermoelectricity transient process of welding was simulated with the finite element software and the experiment under corresponding welding parameters. It’s found that, under proper current circumstances, the simulated nugget size and the experimental result is in good agreement except the large current, the simulated deformation morphology and experimental result can be consistent, which indicates the good accuracy of analysis on resistance spot welding mechanism of dual-phase steel DP600. According to the results, the specific method and theoretical basis about nugget size and welding deformation predictive control was discussed, created the mutual relations between the resistance spot welding performance characteristics and welding mechanism of dual-phase steel DP600. The study effort has practical significance in comprehensively understanding the resistances spot welding mechanism of dual-phase steel, as well as in application and quality control of duplex steel in automotive body welding.
Improved the Physical and Electrochemical Hydrogen Storage Kinetics of Mg2Ni-Type Alloys by Substituting Ni with Co and Melt Spinning
Authors: Ma Zhi Hong , Li Bo , Zhao Dong Liang , Ren Hui Ping , Zhang Guo Fang , Zhang Yang Huan
Published: December 2011

In this paper, melt-spinning technology was used for preparing Mg20Ni10-xCox (x = 0, 1, 2, 3, 4) hydrogen storage alloys. The influences of both the Co substitution and the melt spinning on the the physical and electrochemical hydrogen storage kinetics of the alloys were investigated. The XRD, SEM and TEM characterization exhibits that the as-spun Co-free alloy holds a typical nanocrystalline structure, whereas the as-spun alloys substituted by Co display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The Co substitution gives rise to forming secondary phase MgCo2 without altering the Mg2Ni major phase of the alloys. The measurement of the physical and electrochemical hydrogen storage kinetics of the alloys shows that both the melt spinning and the substitution of Co for Ni markedly improve the physical hydriding and dehydriding kinetics and the electrochmeical kinetics (HRD) of the alloys.
Study on the Effect of Carboxyl Bagasse Hemicellulose on Heavy Metal Adsorption
Authors: Wang Li Jun , Liu Xin Liang , Zhu Hong Xiang , Weng Meng Ling , Li Zhou Jun , Lu Yi Guan , Wu Fu Sheng , Wang Shuang Fei
Published: December 2011

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the carboxyl bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+and Cd2+ are 5.5, 5.5 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the carboxyl bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+and Cd2+ were determined to be 20.28 mg/g, 82.64 mg/g and 30.58 mg/g, respectively.
Study on the Performance of the Modified Single Base Gun Propellant
Authors: Liu Bo , Wang Qiong Lin , Liu Shao Wu , Yu Hui Fang , Li Da , Yao Yue Juan
Published: December 2011

The modified single base gun propellant was prepared from single base propellant grain by impregnation with blasting oil, followed by deterring with deterrent in water medium. The concentration profile of function component in the propellant was studied by Fourier Transform Infrared (FTIR) Microspectroscopy. The combustion performance of the propellant was investigated by means of closed-bomb test and interior ballistic test. The barrel erosion was characterized by erosion tube test. It is found that the curve of nitroglycerine concentration is just like a parabola along the radius and the polymer ester concentration in the near surface of propellant decreases exponentially from the surface inwards. Compared with the single base gun propellant, the modified single base gun propellant burns more progressively and the value of Pr increases from 0.097 to 0.424. The interior ballistic performance for this propellant charge is improved obviously. The muzzle velocity increases by 5.0% from 886.6 m/s to 931.3 m/s. The modified single base gun propellant has the characteristic of low temperature sensitivity and the barrel erosion of this propellant decreases by 26.6% at least. The modified single base gun propellant has the advantages of higher muzzle velocity, higher combustion progressivity, low erosion and low temperature sensitivity.
Phase and Electrical Properties of [Li0.065(Na0.535K0.48)0.95]NbO3 Lead-Free Piezoelectric Ceramics Sintered at Low Temperature
Authors: Li Hai Tao , Zhang Bo Ping , Li Qian , Xu Rong Hui
Published: December 2011

Li-doped (Na, K)NbO3lead-free piezoelectric ceramics with nominal composition of [Li0.065(Na0.535K0.48)0.95]NbO3were prepared by normal sintering method, and its phase structure, microstructure and electric properties were studied with a special emphasis on the influence of sintering temperature in the range of 950-1020 oC. The result of XRD analysis indicates that a polymorphic phase transition (PPT) separating orthorhombic and tetragonal phases was found at the temperature of 950 oC, whereby enhanced piezoelectric properties of d33=255 pC/N and kp= 44.5% were obtained although the density was low. Our study indicates that the importance of PPT for enhancing electric properties in niobate-based ceramics at low temperature.
Study on the Influence Factors of Desilication in Bioleaching by B. Mucilaginosus
Authors: Zeng Xiao Xi , Zhou Hong Bo , Hu Yue Hua , Tang Jian Xin , Jiang Pei , Li Wen
Published: December 2011

Bioleaching is an environmental friendly technology with many potential advantages such as few pollution and low energy requirement. The factors which affected the silicate-dissolving ability of Bacillus mucilaginosus Lv1-2on illite were investigated. The results showed that the optimum inoculum amount was 2%.The best carbon source and nitrogen source were glucose and (NH4)2SO4respectively. The silicon dissolution increased with the powder diameter decreased. The optimal temperature and shaking speed were 30°C and 220 rpm. The proper conditions were consistent with that of the growth of the strain,which confirmed that the strain played an important role in bioleaching.
The Biocompatibility and Bioactivity of Gradient Composite Bioceramic Coating with Different Content of Nd2O3 Fabricated by Wide Band Laser Cladding
Authors: Xiao Ming , Liu Qi Bin , Zhu Yi Zhi
Published: December 2011

To eliminate thermal stress during laser cladding and to raise the bonding strength between substrate and coating, composition gradient coatings are designed and fabricated by using wide-band laser cladding technique on a Ti alloy. The rare earth Nd2O3 was added to improve the properties of the bioceramic coating. The experimental results indicate that when the adding of Nd2O3 reaches 0.6wt%, the characteristic peaks of HA and β-TCP are the highest, which demonstrates the amount of HA and β-TCP is the largest. However, when the content of Nd2O3 is up to 0.8wt%, the peaks of HA and β-TCP conversely goes down. The biocompatibility and bioactivity are related to the amount of HA and β-TCP catalyzed by Nd2O3. When the content of Nd2O3 is 0.6wt%, the number of cells proliferated and the ALP secreted on coatings is the most, which indicate the biocompatibility and bioactivity of gradient bioceramic coating is the best.
Effect of Neodymium Salt in the Anodization of Aluminum in Sulphuric Acid
Authors: Liu Xiao Zhen , Gen Jian Qiang , Yu Ai Bing , Wang Gang , Song Ling Ling , Zhang Xiao Li
Published: December 2011

Neodymium salt was used as additives for the first time in preparing anodic aluminum oxide (AAO) films to improve its performance. AAO films were prepared by anodization method from a 15 vol. % sulphuric acid solution containing neodymium salt; the effects of concentration of neodymium on microhardness and thickness of AAO film were researched, respectively. The effect of heat treatment temperature on structure of AAO film was researched. AAO films were characterized by XRD, EDAX and SEM techniques. The microhardness and thickness of AAO film were 377.2HV and 85μm respectively, which were higher 12.60% and 21.43% than those of the film prepared in electrolyte of nothing addition neodymium salt, respectively. The surface of AAO film was smoother and the aperture of AAO film was more uniform than those of films prepared in electrolyte of nothing addition neodymium salt. The apertures of AAO film were in 25～30nm. There was not neodymium in AAO film. AAO films were amorphous when heat treatment temperatures of AAO film were below 800°C, heat treatment temperature of AAO film were 850°C and 1000°C respectively, AAO films were γ-Al2O3and α-Al2O3film respectively.
Study on a New Method to Produce NiTi Thin Film
Authors: Zhu Yi Guo , Mao Wen
Published: December 2011

A new method to prepare NiTi thin film with two separate targets is presented. In this technology, two pure Ni target and pure Ti target are fixed and the substrate is rotating. The final thin film structure is analyzed by Scanning Electron Microscope. Results show that there is no layer structure in the film; the sputtering power and the substrate temperature have great influence to the morphology of the film; all the grain pattern are column under different technological parameters.
The Effects of Substrate Material and Surface Roughness on the Structure of SnO2 Films
Authors: Li Chun Fang
Published: December 2011

The optical and electrical properties of Tin oxide (SnO2) tranparent conducting film are related to its structural properties. The films were grown by chemical vapor deposition on four different substrates at atmospheric pressure and temperatures of 420°C to investigate the effects of substrate material and surface roughness on their structure. A homemade vertical reactor was used for deposition from SnCl4 + 2H2O precursors. The structure were analyzed by X-ray diffraction (XRD), scanning electron microscopy( SEM). The results indicated that substrate material influenced the crystal size, compactedness and predominant planes of SnO2 films while surface roughness influenced crystallization and compactedness of the films.
Studying on Thickness Control of ITO Films Deposited Using RF Magnetron Sputtering
Authors: Ma Wei Hong , Cai Chang Long
Published: December 2011

Indium tin oxide (ITO) films are widely applied as the transparent electrode in the photoelectric device because of its high conductivity and high transmittance in the visible wavelength. But the resistivity and position of transmittance peak of ITO films were influenced by the thickness of ITO films, so it is important significant to study the deposition rate of ITO films deposited using RF magnetron sputtering. In this paper, ITO films were prepared by RF magnetron sputtering method on K9 glass substrate, the influence of RF power, sputtering pressure, oxygen ratio, and substrate temperature on the deposition rate of ITO films was mainly studied, meanwhile, the influence of annealing temperature on the film thickness and the process stability depositing ITO using RF magnetron sputtering was studied, and the influence mechanism of technique parameters was analyzed.
Preparation of FePt Film via Electrochemical Deposition Method
Authors: Shen Ying Ying , Du Xue Yan , Shi Shi Yi , Li Cui Xia
Published: December 2011

Abstract. A FePt codeposition film was prepared via electrochemical codeposition process, where FeSO4•7H2O and H2PtCl6•6H2O were used as Fe source and Pt source，respectively. The composition and morphology of the FePt film were determined by the applied pulse potentials. Vibrating Sample Magnetometer (VSM) study show that the FePt film with Fe/Pt=1:1 was of soft magnetic properties, and its structure transformed from face-centered-cubic (fcc) to face-centred-tetragonal (fct) structure partly after it was annealed at 550°C for 30min in hydrogen (H2).
High Saturation Magnetization Fe-Co-N Thin Film Deposited by Facing-Target Direct Current Magnetron Sputtering
Authors: Yang Kai Yu , Gao Yin Han , Zhao Cui Mei , Wang Xin , Zheng Wei Tao
Published: December 2011

Magnetic materials have long been used for signal processing structures in the microwave range. High-frequency signal processing as for band-stop or notch filters, ferromagnetic resonance frequency can be adjusted or set by magnetic properties, such as saturation magnetization Ms. In this work, Fe-Co-N thin films have been synthesized using an improved facing-target magnetron sputtering system, where the sputtering current on Co and Fe targets can be regulated independently. During deposition of Fe-Co-N thin film, parameters on Fe target followed the one for synthesis of ε-Fe3N, while changing the input current on Co target. It was found that on an unheated substrate, with the Co content of about 7 at.%, high value of Ms(265.08Am2kg-1) could be obtained in the Fe-Co-N film, which contained α"-(Fe,Co)16N2nanoparticles with the average size of 7 nm.
Resistivity Control in Unintentionally Doped GaN Films Grown on Si (111) Substrates by MOCVD
Authors: Wang Yong , Yu Nai Sen , Li Ming , Lau Kei May
Published: December 2011

Unintentionally doped GaN were grown on Si (111) substrates by metal organic chemical vapor deposition (MOCVD). The high-resolution X-ray diffraction (HRXRD) and Lehighton contactless sheet resistance measuring systems were employed to characterize the quality and sheet resistance (Rs) of GaN epilayer. The threading dislocation density (TDD) was estimated by calculating the full width at half maximum (FWHM) of GaN (0002) and (10-12) diffractions measured by HRXRD. The relationship between Rs and TDD in GaN epilayer was investigated. The influence of growth conditions of bottom GaN initial layer including carrier gas category (H2 or N2), growth temperatures, and growth pressures on the quality or resistivity of top GaN epilayer was discussed and analyzed. As a result, the improved resistivity was achieved in top GaN epilayer with low TDD by using H2 carrier, low growth temperature of 1050°C, and high growth pressure of 400mbar during the growth of bottom GaN initial layer.
The Research Situation and Development Trend of Energy Saving Phase Change Materials
Authors: Yang Bao Ping , Li Yan Hua , Cui Jin Feng , Guo Jun Hong , Zhou Ying Ping , Zhang Peng Fei , Liu Yong Liang , Ma Yong Qiang
Published: December 2011

The energy saving principle of phase change materials is introduced briefly， the current status of the energy saving phase change materials and the newest progress are also discussed. The promising development trend of the energy saving phase change materials is prospected. With the effect of energy crisis, the difficult problem which we face is the energy consumption, energy saving and emission reduction is the first question that should be solved in all works of life. As the living standard improved, the human comfort require of indoor environment become more strict. Because of air conditioning making the power system load too large, energy saving technology has been paid a high degree of attention, and energy saving phase change materials ,as a new materials, has gradually become a focus in the study of energy utilization and material science.
Effect of Al Ions on Adsorption Efficiency of Mesoporous Organosilica for Water Treatment
Authors: Mohd Hanafi Ani , Mohd Hatta Maziati Akmal , Othman Raihan
Published: December 2011

Porous organosilica is a promising material to be applied in water treatment due to high adsorption capacity of contaminants. Sol-gel method was used to fabricate mesoporous organosilioca from triblock copolymers, poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) as the template and tetraethylorthosilicate as silicate source. The organosilica is doped with Al powder and Al2SO3 in order to evaluate the effect of ions on their adsorption capacity. It was demonstrated that the adsorption capacity is proportional to Al concentration, and inversely proportional to porosity. Metallic compound doped in organosilica enhances the remediation process and optimize the water treatment process. Moreover, impregnation the samples into cellulosic sponge improves the adsorption efficiency by 25%.
Dynamic Analysis and Simulation of Variable Topology Parallel Tire Building Drum Mechanism
Authors: Sun Shu Hua
Published: December 2011

A new type of parallel tire building drum mechanism is proposed. The structure of the mechanism is analyzed, and the degree of freedom is calculated .The solid model of the mechanism is established by UG, and then the kinematics of the mechanism is analyzed through the establishment of the Lagrange Dynamic Equations. The kinematics simulation is conducted using software code of ADAMS.
TiCl4 Treatment to the Substrate of Dye-Sensitized Solar Cell for the Applications on BIPV
Authors: Tian Han Min , Yang Rui Xia , Tian Feng Lan
Published: December 2011

The process of TiCl4 treatment on the FTO substrate of DSSC were analyzed and the microstructures of substrates before and after treatment were observed. Further more, the influence of TiCl4 treatment on the substrate of Dye-sensitized solar cell to photo-current voltage performance was numerical analyzed.
Metallographic Study of Laser Thermal Fatigue Damage on Piston
Authors: Liu Zhen Tao , Pang Ming , Tan Jian Song , Liu Xiu Bo
Published: December 2011

The experiments of thermal fatigue damage on piston were conducted by shaped high power laser. Microstructure of thermal fatigue damaged specimen was characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The mechanical properties of thermal fatigue specimen were evaluated by microhardness and the corresponding damaged mechanisms were discussed. The results show that cracks originated from the interface of Al-matrix and intermetallic phase due to the thermal and mechanical mismatch between the brittle components of the microstructure and the surrounding ductile matrix. Oxides of thermal fatigue crack can accelerate the damage of piston. There exists a decline tendency in the microhardness of piston at all locations after thermal fatigue tests due to the comprehensive effects of nonequilibrium distribution of temperature and cooling method.
Experiment Study on Aviation Kerosene's Flash Point Temperature of Low Pressure Environment
Authors: Tang Yan Fei , Yin Lei , Niu Yi , Wang Jian
Published: December 2011

Flash point is one of the major physical and chemical properties used to determine the fire and explosion hazards of liquids; therefore, the prediction of flash point is an important safety consideration. However, the study on flash point and the correlation between flash point and pressure has been inadequate, and needs further investigation. So in this paper, the experimental method is adopted to study the correlation between the closed flash point temperature of RP-5 Aviation Kerosene and low pressure environment. In the experiments, use the BS-1 closed bomb apparatus to measure the oil samples and use the hypobaric chamber to change the environment pressure from 50kPa to 101.3kPa. Through the experiment data, it indicates that the atmospheric pressure is much lower than the normal atmosphere, there is a quadratic function relation between the reciprocal Aviation Kerosene's flash points and logarithm of environment pressure, therefore the relationship between the reciprocal Aviation Kerosene’s flash points and altitude is reciprocal. Compared the experiment results with theoretical results, it finds that the experiment result is closed to reality. The experiment results will provide the scientific data for the safety of aircraft tank, and benefit the fire protection, such as inflammable liquid production, transport, storage et al in oil pipeline management.
Study on a Anti-Optimization Method to Identify the Parameters of the Frequency Correlation Viscoelastic Model for Rubber
Authors: Liu Wen Wu , Jiang Rong Jun , Lou Jing Jun , Wu Hai Ping
Published: December 2011

The key to analyze the dynamic characteristics of rubber products in frequency domain is to obtain the frequency correlation viscoelastic models of rubber. Firstly, an improved anti-optimization method using the parallel computing module of ISIGHT integrated ANSYS and MATLAB was proposed to identify the parameters of frequency correlation viscoelastic model for rubber. Secondly, the method is applied to obtain the viscoelastic model of a rubber metal ring, of which the frequency range is from 2Hz to 10Hz, and comparison between the results and the experimental results shows that the proposed method is effective.
A Empirical Study of Industrial Design Contribution to Advances in Timber Materials Science
Authors: Thong Christine , Kuys Blair
Published: December 2011

Materials Science typically engages research expertise from fields such as engineering, chemistry and physics. This paper will examine how industrial design successfully contributed to timber materials science in the initial phases of basic research. Research from two PhD studies, completed in conjunction with the Australian Cooperative Research Centre (CRC) for Wood Innovations, will be used as case studies. These case studies discuss examples from research projects investigating new Microwave Modified Timber (MMT) materials development along with surface modified timber. Findings concur that industrial design research was beneficial to early scientific experiments.
Epoxy Cured with Anhydride Terminated Polydimethylsiloxane: Cure Kinetics and Thermal Properties
Authors: Ren Yuan , Xi Zheng , Gan Wen Jun , Zhang Liang , Zhang Jing , Zhang Xin Yu
Published: December 2011

A siloxane-containing dianhydride, succinic anhydride terminated polydimethylsiloxane (DMS-Z21) was selected to cure diglycidyl ether of bisphenol-A based epoxy resin (DGEBA). The cure kinetics and thermal properties were investigated by nonisothermal and isothermal differential scanning calorimetry (DSC) and thermogravimetric analyses (TGA), respectively. The activation energy (Ea) of the curing reaction was obtained based on the methods of Kissinger and isothermal measurements. The results of the thermogravimetric analyses of the DGEBA/DMS-Z21 system showed that the thermal stability of the DGEBA/DMS-Z21 system was slightly higher than the DGEBA/MeTHPA system.
The Experimental Study of TiO2 Nano Compound Coating Applied in Air Conditioner
Authors: Wang An Ling , Xiong Li Gui , Chen Wei Dong , Liu Xiang Yun
Published: December 2011

Experimental study was carried out with TiO2 Nano-sized compounds coated on aluminum foil to study the cleaning properties and heat transfer effect. The experiments were also carried out for air conditioners which fins of evaporator and condenser were coated with TiO2 nano compound coating. Results show that the foils with TiO2 nano compound coating presents better self-cleaning property and improved heat transfer effect. Air conditioner’s properties with TiO2 nano compound coating evaporator and condenser is higher than that without coating. The maximum heat capacity was found to be increased 8%. The nano-sized liquid showed better synthetic function such as excellent hydrophilic, better cohesion, water flushing resistance.
Enhancement of Machinability of Inconel 718 in End Milling through Online Induction Heating of Workpiece
Authors: Amin AKM Nurul , Hossain Mohammad Ishtiyaq , Patwari Anayet Ullah
Published: December 2011

Abstract. This paper presents the outcome of a study on heat assisted end milling of Inconel 718 using inducting heating technique conducted to enhance the machinability of the material. The heating temperature maintained below the phase transformation temperature was aimed at softening the top removable material layers. The experimental results of both conventional and heat assisted machining were compared. The machinability of Inconel 718 under these conditions was evaluated in terms of tool life, tool wear morphology and chatter. The advantages of Induction heating is demonstrated by an longer tool life and lower chatter. The study showed that preheated machining facilitates up to 80% increase of tool life over conventional machining conducted using TiAlN coated carbide inserts.
Characterization of LiClO4-SiO2 Composite Electrolyte Prepared by Modified Sol-Gel Method
Authors: Mat Hafizul , Nor Sabirin Mohamed , Subban Ri Hanum Yahaya
Published: December 2011

(100-x) LiClO4-xSiO2(x is mol %) solid composite electrolytes in various compositions were synthesized by modified sol-gel process with sintering at 200 °C. The electrical and structural properties of the composites were investigated. The ionic conductivity of the composites increased with mol % of the dispersoid and then decreased. The highest conductivity was obtained for x = 50 mol % with a value of 4.06 × 10-7S cm-1at room temperature. The enhancement in conductivity was more than two orders of magnitude when compared to the host material. The higher conductivity in the SiO2dispersed system was interpreted in terms of space charge layer and percolation theory. The temperature dependence of conductivity of all samples were Arrhenian in nature and exhibited a maximum of 10-3S cm-1at T = 140 °C for x = 50 mol %. XRD spectra showed presence of heterogeneous phase of LiClO4-SiO2crystalline peaks.
Preparation and Thermoelectric Characteristics of SiO2/Mg2Si0.8Sn0.2 Bulk Nanocomposite
Authors: Zhang De Hua , Fan Wen Hao , Zhang Feng , Chen Shao Ping , Meng Qing Sen
Published: December 2011

In the present study, Mg2Si nanoparticles of high purity were successfully synthesized through low-temperature reaction by using MgH2and Si powders as rawmaterials. The size of Mg2Si particles is about 50nm. The bulk nanocomposites xSiO2/Mg2Si0.8Sn0.2(x = 0, 0.1, 1 and 2wt. %) were followed by field-Activated and pressure-assisted synthesis (FAPAS). The effects of SiO2addition on the microstructure and thermoelectric properties of Mg2Si0.8Sn0.2were studied. The field emission scanning electron microscopy shows that the nanometer-sized SiO2particles disperse homogeneously in Mg2Si0.8Sn0.2matrix. Among all of the samples, 1wt. % SiO2/Mg2Si0.8Sn0.2exhibits the best figure of merit (ZT = 0.25 at 573 K), which is 24% higher than that of the sample without SiO2, indicating that the thermoelectric properties of Mg2Si0.8Sn0.2can be enhanced effectively by the dispersion of nanometer-sized SiO2.
Study on Pr-Substituted Bismuth-Iron Garnet Crystallite and its Magnetism
Authors: Sun Yu Xia , Yu Hua , Liu Hong Ri , Zhou Yong , Xia Zhao
Published: December 2011

Pr substituted Bi3Fe5O12crystallites were prepared by a hydrothermal method using Pr(NO3)•6H2O, Fe(NO3)•9H2O and Bi(NO3)3•5H2O as raw materials. XRD, SEM and PPMS were used to analyzed crystal phase, morphology and magnetism of the crystallites, respectively. XRD result showed that the Pr-substituted crystallites of different ratio present cubic garnet phase without impure phase; SEM result showed that morphology of the crystallites varies with the substitution ratio of Pr. Moreover, magnetism of the crystallites was studied. The crystallites present antiferromagnitsm.
The Geometrical Feature Recognition Method of Part Drawing
Authors: Dong Yan , Li Mei
Published: December 2011

This paper put forward a geometry feature recognition method of part drawing based on graph matching. Describe the constraints structure of geometric feature in geometric elements and those constraint relationships. Match sub-graph in contour closure graphics and those combination. Using linear symbol notation of chemical compounds in chemical database for reference, encode to constraint structure of geometry graphics, establish recognition mechanism of geometric characteristics by structure codes. Taking the fine-tune screw and fork parts for example, this method has been proved to be effective.
Electrical-Pumped Active Plasmonic with InP-Based Quantum Wells
Authors: Li Te , Hao Er Juan
Published: December 2011

The InP-based wafers with InGaAsP multiple Quantum Wells (QWs) were designed for the loss compensation of surface plasmon polaritons (SPPs). Electrical-pumped device was fabricated by conventional III-V processes and e-Beam lithography (EBL) technology. When forward voltage is added on the device, it is observed that the gain of the quantum wells at 1.55μm assist the propagation of SPPs.
Random Response Analysis for Nonlinear Systems of Composite Laminates
Authors: You Feng Xiang , Zhang Fei , Zuo Buo Lei
Published: December 2011

Geometric parameters of composite materials often have a random nature in engineering structures. How to study random response and statistical properties of nonlinear systems with random parameters has a very important significance for reliability and optimization of structural design. In this paper, perturbation method and random central difference method are explored to establish composite nonlinear vibration equations and computational model to study random responses of nonlinear systems with random parameters under deterministic loading of the composite laminates, numerical examples illustrate the correctness of the algorithm.
Study on the Morphology of Nano-ZnO in Foam Glass
Authors: Yu Fang Yun , Sun Qing Chi , Ma Wei Bing , Lv Dong Sheng , Li Xiu Hua
Published: December 2011

Nanoscale ZnO has received considerable attention due to its remarkable properties like absorbing wave. Foam glass containing nano-ZnO can enhance the property of wave absorbing. Investigating the morphology of nano-ZnO and researching the moderate amount of Zn filler in the foam glass are important. In the work, Zn filler was added into the porous glass to grow the nano-ZnO with no catalyst by Vapor-Solid mechanism. Foam glasses were fabricated by sintering mixture of pure foam glass raw material and Zn powder. The patterns of nano-ZnO were investigated by scanning electron microscope (SEM). Meanwhile, the detail of the growth mechanism of ZnO in foam glass was analysed. The results indicate that with the content of Zn increased, the granular nano-crystals become more, and the crystal whiskers become less, shorter, and a little thicker in pores. The diameter of the whiskers is about 50 nm. What’s more, the size of pores become small as Zn mass ratio increasing.
Optimizing Preparation Technological Parameters of Nano-LiAlO2 Powder by Orthogonal Experiment
Authors: Cui Sheng , Lin Ben Lan , Gao Zhi Qiang , Shen Xiao Dong
Published: December 2011

Citrate hydrolyzing method was used to prepare nano-LiAlO2 powder, and the technological parameters were optimized by orthogonal experiment. The minimum size of LiAlO2 powder was about 100nm, obtained when the green performs were sintered at 690°C for 2h, with the molar ratio of citric acid and metal-salt of 1:1 and concentration of Li+ of 0.5mol/L. XRD and SEM were used to examine the phase composition, particle size and microstructure. The LiAlO2 powder had been agglomerated during the sintering process.
Harmful Gas Measured Research for GuanJiao Tunnel on Qinghai-Tibet Plateau Region
Authors: Xie Zun Xian , Sun San Xiang , Li Guo Liang , Zhao Dong
Published: December 2011

Under the natural ventilation conditions, two stage nitrogen oxides (NOx), carbon monoxide (CO) and total suspended particles (TSP) in the air of GuanJiao tunnel were monitored. GuanJiao tunnel is located in plateau region and diesel traction trains run through it. Time and space distribution of NOx, CO and TSP content in the tunnel were analyzed. The results show that the harmful gas concentration of freight train is higher than passenger train under the natural ventilation conditions. 15 min after the train run through the tunnel, NOx concentrations were less than 2 mg/m3, CO concentrations were less than 3mg/m3, which meet the standard operating ventilation of the ‘operational railway tunnel ventilation design specifications’ (TB10068-2000).
A New Fuzzy Parameters Reliability Analysis Model
Authors: Chen Hai Jun , Lou Xi Juan , Liu Jie
Published: December 2011

The most difficult form of its periodicity is one of the conditions of the elements which traversing the entire results of the corresponding operations, when the fuzzy numbers in the use of traditional methods of operation principle of extension to express problems. The operation to fuzzy analysis of the process of application of the theory has brought great difficulty, and which making the actual operation can not proceed. Fuzzy parameters of the reliability of the system had been studied, and it had been compared with the traditional fuzzy reliability analysis. We proposed a new reference to the reliability of fuzzy membership function and its form of expression. And it reached a more precise definition of fuzzy reliability of confidence interval type. It solved some problems such as the traditional fuzzy reliability analysis in the mass caused by the calculation of fuzzy computing complexity and low-precision. Hydraulic systems as an example of fuzzy parameters based on the reliability of the information model have proved that the model has good application value.
Micro Cantilever Beam Theory for Transverse Dynamics Using a Continuum Mechanics Model
Authors: Li Cheng , Huang Wei Guo , Yao Lin Quan
Published: December 2011

The vibrational characteristics of cantilever beams with initial axial tension were studied using a nonlocal continuum Euler-Bernoulli beam model. Small size effects are essential to nanotechnology and it can not be ignored in micro or nano scale. Nonlocal elasticity theory has been proved to work well in nanomechanics and it is considered into the governing equation which can be transformed into a fourth-order ordinary differential equation together with a dispersion relation. Boundary conditions are applied so as to determine the analytical solutions of vibrational mode shape and transverse deformation through a numerical method. Relations between natural frequency and the small scale parameter are obtained, including the fundamental and the second order frequencies. It is found that both the small scale parameter and dimensionless initial axial tension play remarkable roles in dynamic behaviors of micro cantilever beams and their effects are analyzed and discussed in detail.
Effect of Cold Reduction Ratio on Deep-Drawing Performance of High Strength Ti-Nb-If Steel Sheets
Authors: Wang Min Li , Zheng Zhi Wang , Xiao Li
Published: December 2011

Hot rolled high strength Ti-Nb-IF steel sheet was used to study the effect of cold reduction ratio on the microstructures, mechanical properties and textures of experimental steel. The experimental results showed that the recrystallization has finished under different cold reduction ratio. The yield strength, tensile strength, elongation, the plastic strain ratio and strain hardening exponent were approximate 242MPa, 408MPa, 39.5%, 1.8, 0.26. With the cold reduction ratio increase, the textures strength increase, and the α textures have a trend with {111} texture. Therefore, the suggested the optimal cold reduction ratio is 75%, and it obtains optimally match of high strength and punching property.
The Influence of the Residual Mg Content in the Ductile Cast Iron on the Formation Law of Spherodial Graphite
Authors: Shen Zhi Qing , Zheng Hong Liang , Li Tong Tong , Xu Yan , Xu Rong Fu , Tian Xue Lei
Published: December 2011

The residual Mg content ,spherodize ratio and nuclei of spherodial graphites(abbreviated SG) were studied by casting a series of similar composition ductile iron rods and white samples with different holding time of spheroidizing. The results indicate that the residual Mg content in the ductile iron was less and less as the holding time grows ,which causing the morphology of graphites transfer from spherodial to oval. Spherodize ratio change law is not continuous as increasing the residual Mg content which is divided at the 0.02%. The morphologies of nuclei of SGs core are typical examples of the highly magnified structure of spherical and irregular polygons; the diameters are about 0.5~2μm, consisting of (Mg, Ca)S along with CeO2and MgO. Disregistry δ between the nucleus compounds and graphite are low,which indicates that nucleus compounds are good nucleating site for SGs.The Mg element in nuclei of SG just act as nucleation substrates.it is the Mg which maybe simple substance in the metallic matrix that act as the role of spherodizer determines the graphite shape.
Backpressure of Three-Dimensional Reticulated Structure Silicon Carbide Ceramics Foam Filter
Authors: Du Qiny Yang , Bai Jia Hai , Xu Hui Jun
Published: December 2011

Three-dimensional reticulated structure silicon carbide ceramics foam is used as filter element materials of diesel exhaust particulates filter. According to the flow state of diesel exhaust, adopting Navier-Stokes equation calculating analysis and combining with experimental results, the backpressure formula of diesel exhaust filter whose element is silicon carbide ceramics foam is determined. The calculation data agree with the experimental results very well.
Deformation and Heat Transfer Analysis for High Speed Dieless Drawing of AZ31 Magnesium Alloy Tubes
Authors: Furushima Tsuyoshi , Ikeda Takuma , Manabe Kenichi
Published: December 2011

The effect of drawing speed and heating length on deformation behavior was investigated by numerical approach for AZ31 magnesium alloy tubes to realize high speed dieless drawing process. The length of deformation zone expands with increasing the feeding speed. The increase in heating length leads to expanding length of deformation zone. The mean strain rate increases with increasing the feeding speed firstly, and then rate of increase in the strain rate becomes gradual under condition of any length of heating band. Based on these results, a limiting reduction in area of 52.5% under higher speed and larger heating length conditions can be realized experimentally.
Effect of Ni-Coated Carbon Nanotubes on the Corrosion Behavior of Sn-Ag-Cu Solders
Authors: Tang Si Yi , Jing Hong Yang , Xu Lian Yong , Han Yong Dian , Lu Guo Quan
Published: December 2011

In this paper, varying weight percentages of Ni-coated carbon nanotubes (Ni-CNTs) was incorporated into Sn-Ag-Cu (SAC) solder matrix, to form composite solder. Up to 0.05% of Ni-CNTs were successfully incorporated. After that, the electrochemical behavior of Sn-Ag-Cu with varying weight percentages of Ni-coated carbon nanotubes (Ni-CNTs) composite solder were investigated in 0.3% Na2SO4 solution by using potentiodynamic polarization method. Scanning microscopy was used to characterize the samples after the electrochemical tests. It was observed that the corrosion resistance decreased when the content of Ni-CNTs reached a certain level.
Picosecond Laser Microstructuring for Black Silicon Solar Cells
Authors: Zhu Xiao Ning , Zhu Hong Liang , Liu De Wei , Huang Yong Guang , Wang Xi Yuan , Yu Hai Juan , Wang Shuai , Lin Xue Chun , Han Pei De
Published: December 2011

Sulfur-doping and broad band absorptive black silicon materials were fabricated by picosecond laser irradiation. Two kinds of microstructures, laser induced periodic surface structure (LIPSS) and conical spikes were obtained by changing parameters of laser scanning. Black silicon solar cells with back surface field were explored. Influences of different rear side structures to devices were presented and conversion efficiency of 9% is available.
Increasing Solubility of Poorly Water Soluble Drug Resveratrol by Surfactants and Cyclodextrins
Authors: Kumpugdee-Vollrath Mont , Ibold Yvonne
Published: December 2011

Resveratrol (Res) is a polyphenolic secondary natural substance and can be used as anti-inflammatory, anti-aging, anti-heart disease and anti-cancer agent. However, Res has low water solubility which causes a low bioavailability in human body. In order to increase solubility we have prepared different inclusion complexes with native ((α, β, γ) and modified (2-hydroxypropyl-beta, dimethyl-beta) cyclodextrins (Cd) as well as solid dispersions using several surfactants (Imwitor 742, Imwitor 928, PEG 6000, Span 40, Span 60, Solutol HS15) with Res. The solubility of all mixtures was determined by UV-VIS spectroscopy at the wavelength of 305 nm. Regarding the Cd, the complex of Res with 2-hydroxypropyl-beta-Cd at a ratio of 1:3 showed the highest water solubility (248210 g/l). Concerning the surfactants, the solid dispersion from Res and Solutol HS15 showed the highest water solubility (16140 g/l). The complexation and the solid dispersion phase were confirmed by DSC. The results will be a basis for better formulation of resveratrol with higher bioavailability.
Investigation of the Bird Shape Effects on the Simulation Results of Bird Striking Laminated Aircraft Windshields
Authors: Liu Li Zhong , Ma Zhen Zhu , Pang Shi Hong , Zang Shu Guang , Ou Ying Chun , Zuo Yan
Published: December 2011

Finite element simulations are widely used in the analysis of bird strike events in the literatures. While the shapes of the artificial birds used in the simulations are not indentical. In order to investigate the effects of artificial bird shapes on the response of laminated aircraft windshield, the often used shapes including hemispherical-ended cylinder, straight-ended cylinder and ellipsoid are modeled in this work. The striking velocity is 80.6 m/s and the SPH method is adopted. Based on the calculation results, the impact force, dissipated energy and major principle stress in the glass are analyzed. The analysis shows that the initial contact area would affect the values of these results. The shapes and aspect ratios affect the results through the initial contact area.
Study on the Treatment of High Salinity Oil Waste Water by Reverse Osmosis Technology
Authors: Ji Lin , Liu Ying , Zhang Yu Feng , Liu Xun Dao
Published: December 2011

Taking reverse osmosis (RO) technology for the treatment of high salt containing oil waste water as the example, this study investigated the relationship between the pressure and the permeate flux, the stability of the membrane module and the membrane cleaning cycle. The results show the feasibility of RO technology for the treatment of high salt containing oil waste water.
Dynamic Simulation for Driver-Tricycle-Road System with Rigid-Flexible Coupling
Authors: Han Xiang
Published: December 2011

Performance simulation for driver-tricycle-road hasn’t been reported currently. According to rigid-flexible coupling dynamic theory, this article took the frame and the spring as the spatial flexible body, used the UA tire model, considered the engine and the road surface drove, established tricycle rigid-flexible coupling dynamic model based on driver-tricycle-road environment and simulated its system modality, acceleration and brake dynamic characteristic. The simulation result indicated this tricycle has the good dynamic performance and the conclusion has the important project practical value.
Heating Path Generation and Simulation for Ship Plate Steel
Authors: Zhu Hu , Yang Xiao Guang
Published: December 2011

To lay the foundation of the automation for line heating forming, a method for heating path generation and simulation for ship plate steel base on STL mode was proposed in this paper. The line heating path was generated by slicing the STL model of the steel plate using a series of planes, and the models of the heating equipment of ship plate steel were build, and the heating process of ship plate steel can be simulated by inputting the models of the heating equipment into the simulation system that was built by using VC++ and OpenGL. The case study shows that the method can primely solve the inconvenient of manual heating and the whole heating process can be observed by the simulation so that the heating process can be made a reasonable monitoring, and the heating path generation and simulation software are runs stably and reliably.
Research on Automation of Simulation Analysis
Authors: Zhu Lin , Wang Chun Jie
Published: December 2011

CAE software is used to help mechanical engineers design complicated products. There are many problems in this process, for example lack of analysis theory, lack of experience in simulation analysis and lots of repeated manual operations. To solve these problems, this paper studies the process of simulation and puts forward an automatic method of simulation analysis to realize the automatic simulation analysis. This method contains two parts: databases and automatic analysis flow. To make this method easy and universal, several principals are established. Through this method, mechanical engineers can draw their attention to mechanical design instead of simulation analysis.
Component-Based Modelling and Revising Method for Micro Device
Authors: Liu Zheng , Chen Hua
Published: December 2011

The top-down design method is effective to improve the designing efficiency of micro device. The manufacturability of the derived physical level model is the key point for the designing flow. A method to optimize the fabricating information of micro device from a feature-based design model is presented. The component-based constructing method involves functional components mapping, template based designing and 3D features constructing technique. Along with the designing flow, the vertical and horizontal parameters of the original model are revised by the key enabling technologies that are introduced briefly. With cooperative design mode, the process model derivation and optimization are accomplished simultaneously. This work provides designer a more intuitive way to design product by means of process verification to improve manufacturability.
A Computer Aided Assembly Sequence Evaluation Method Based on the Fuzzy Theory for the Complex Products
Authors: Zhao Lei , Li Yuan , Wang Yan Ping
Published: December 2011

Aim at the characteristic of airplane assembly sequence evaluation, which has too many rules, and the quantity process of qualitative rules is too complicated, this paper presents an evaluation mode based on the fuzzy theory and the multi-index progressive model. According to the evaluation rules space and the coefficient distributed method of rules compared, it divides the rules space into force associated decision-making gather and weak associated decision-making gather by defining the cut value. Then it adopts the maximal subjection fundamental to implement the function of assembly sequence evaluation. An instance about airplane sub-assembly is used to prove this method can solve a practical application availably.
Remanufacturing Technology Analysis of Construction Machinery and Equipment
Authors: Tian Guo Fu , Zhang Zhi Sheng , Jin Fan Zhi , Qiao Yang Yang
Published: December 2011

The structure, working characteristics and main parts failure types of construction machinery were discussed in this paper. The reasons of failures are analyzed too. Based on producing theory, the remanufacturing technology of different failures for construction machinery is discussed. It was proved that the remanufacturing technology is feasible and practical, and has theoretical and applicable values.