bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of Corundum/Mullite Composites by Sintering
Authors: Yang Zhong Zheng , Li Ke Liang , Zhao Wen Xuan , Zhang Yue
Published: August 2011

Mullite/corundum composites synthetized by sintering with bauxite as raw material was researched. The sintering temperature, main crystal phase, microstructure and fracture mode of the composites synthetized by sintering are different with change of ratio of Al2O3 and SiO2 and content of Al2O3: (1) If the ratio of Al2O3 and SiO2 and content of Al2O3 is low, sintering temperature of the composites is high, the main crystal phase is mullite, microstructure shows interlocking network structure formed by columnar mullite, the fracture mode of composites shows that mullite appears in the pulled out state; (2) If the ratio of Al2O3 and SiO2 content of Al2O3 is high, sintering temperature of the composites is low, the main crystal phase is corundum, microstructure shows the skeleton structure formed by granulous corundumthe, the fracture mode of composites shows intergranular fracture formed by corundum, occasionally transcrystalline fracture. The major reason of different sintering temperature of the composites is concerned with mullitization degree and content of glass phase.
The Viscosity Measurement of Polyethylene Glycol Dilaurate
Authors: Chen Tong Yu , Liu Yan Jun , Zhu Qing
Published: August 2011

This paper mainly studied the Viscosity of polyethylene glycol dilaurate and the surface tension, discussing the effects of temperature, concentration, rotate speed on the viscosity. The results show that the viscosity of the long carbon chain fatty acid was higher than the short carbochain, and the viscosity decreasing trend with increase of the temperature. The internal structure of emulsion may take place changing due to the temperature changing. The liquid crystal disintegration or occurred phase change could result that the viscosity appeared the abrupt peak. The viscosity of emulsion maybe appear one or two peaks with the changing of concentration, that the viscosity decreasing with increase of the temperature and rotate speed.
First Principle Investigation of O2 Adsorption on the LaMnO3 (001) Surface
Authors: Yan Zhi Guo , Hui Wang , Xuan Ai Guo , Wu Yuan Xin
Published: August 2011

The first-principle method based on the pseudopotential plane-wave is adopted to analyze O2 adsorption on the LaMnO3 (001) surface. The calculated results indicate that, LaMnO3 presents half-metal properties by calculating the band structure and density of states (DOS). In the MnO6 octahedron, the O-Mn-O bond is mainly covalent, on the contrast, O-La-O bond is mainly ionic. Molecular oxygen can adsorb on the LaMnO3 (001), M2 may be the most favourable adsorption mode. The adsorption mode leads to the formation of .The valence of Mn in the adsorption sites after adsorption of M1 and M2 is Mn3+0.25, Mn3+0.31, respectively. M2 may be the most adsorption mode that can make Pd 0 to shift Pd2+ more quickly in the process of direct synthesis of diphenyl carbonate (DPC) using the catalyst -Pd supported on the LaMnO3.
Modification of Asphalt by Montmorillonite
Authors: Zhang Zeng Ping , Wen Yong , Pei Jian Zhong , Chen Shuan Fa
Published: August 2011

Montmorillonite (MMT) modified asphalts are prepared by melt blending with the help of high-speed shear mixer. The dispersion of MMT layers in the asphalt matrix are characterized by X-ray diffraction (XRD). The effect of different contents of MMT on physical properties of the base asphalt is studied. These properties include penetration, softening point and ductility. The results indicate that MMT/asphalt may form a nanocomposite structure with MMT layers intercalated by the asphalt molecules. MMT can improve the high temperature performance and temperature sensitivity of the base asphalt. And it can slightly reduce the low temperature performances of matrix asphalt. It is found that low temperature performances, high temperature performance and temperature sensitivity of the modified system achieved balance when the content of MMT is 4 wt%.
Effects of Mg Substitution on the Thermoelectric Properties of Ca3Co4O9-Based Materials
Authors: Qi Xiao Ling , Fan You Yu , Zeng Ling Ke , Zhu Dong Sheng
Published: August 2011

Polycrystalline Ca3-xMgxCo4O9(x=0-0.3)ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermoelectric properties were measured from room temperature to 673 K. The substitution of Mg2+for Ca2+had a greater impact on the thermoelectric properties of Ca3Co4O9. The electrical conductivity and the thermal conductivity reduced significantly with increasing Mg content, and the Seebeck coefficient increased simultaneously. The influence of Mg doping on the thermal conductivity is mainly embodied in the lattice thermal conductivity of Ca3Co4O9. The lattice thermal conductivity showed a significant change with the increase of the dopant content, while the carrier thermal conductivity had no obvious change with the doping increasing. These results indicated that the thermoelectric properties of the material could be optimized remarkably with the substitution of Mg. The figure of meritZreached 1.08×10-4K-1at 573 K for the sample of Ca2.8Mg0.2Co4O9.
Calculation and Analysis on PM Thermal Characteristics Influence Performance of PMSM Based on FEM
Authors: Liu Ji Zhu , Yu Xiao Hui , Wang Shao Hua , Chen Tao , Long Rui Zheng
Published: August 2011

The irreversible demagnetization of Nd-Fe-B permanent magnet (PM) material appears during the use of Nd-Fe-B permanent magnet synchronous motor (PMSM) has been blocking this kind of motor towards the direction of large-scale. Demagnetization of PM is mainly affected by the working temperature and the reverse magnetic field of stator armature, and the accurate calculation for the demagnetization characteristics of PMSM is usually difficult by using the analytical method. In this paper, we derive the calculation formula of the knee point under a working temperature for permanent magnets in PMSM firstly, then calculate and analyze the demagnetization characteristics of PMSM under different working temperatures and loads by using the Finite Element Method (FEM), Thereby more accurately reflect the working characteristics of PM and the overload capability of motor. This paper provides theoretical basis for the selection of PM materials and the calculation of PM thickness in the PMSM design.
Marine Growth Effect on the Vibration Characteristics of Offshore Wind Turbine with Jacket Foundation
Authors: Shi Wei , Park Hyun Chul , Chung Chin Wha , Kim Young Chan
Published: August 2011

Due to the energy crisis and greenhouse effect, wind energy is becoming one of the most attractive renewable energies during last three decades. Especially them offshore wind energy gets more attention because it could provide better wind condition with less turbulence and no visual impact and land limitation. Different foundation types could be used for offshore wind turbine. Jacket foundation is regarded as a suitable solution for the intermediate water depth ranging from 30 to 80 meters. On the submerged members of jacket, numerous type of marine fouling organism may be found. They may increase the diameter of the members, change the surface roughness and influence the hydrodynamic loads of structures. In this paper, the types and distribution of marine growth are presented. Effects of marine growth thickness, density and hydrodynamic coefficients on vibration characteristics of offshore wind turbine are discussed. The natural frequencies of the coupled system are compared.
Numerical Simulation on the Static Torque Performance of Vertical Axis Wind Turbine with Different Blade Airfoils
Authors: Li Yan , Feng Fang , Tian Wen Qiang , Tagawa Kotaro
Published: August 2011

Recently, the straight-bladed vertical axis wind turbine (SB-VAWT) receives more and more attentions for its simple design, low cost, and good maintenance. The torque performance of the SB-VAWT is greatly affected by the blade airfoil. In order to research the static torque characteristics of SB-VAWT with symmetrical and non-symmetrical blade airfoil, numerical simulations by 2D CFD method were carried out on three kinds of blade airfoils including NACA0018, NACA2418 and NACA4418 at different azimuth angles. Furthermore, the static torque coefficient of the SB-VAWT with four blades with the three kinds of blade airfoils was calculated. The pressure and velocity fields were also obtained to analyze the static torque performance. Based on these results, the effects of blade airfoils on the starting torque performance of the SB-VAWT were compared and discussed.
Analysis on Proportion and Development of Steel Workers’ Hospitalization Costs
Authors: Yin Su Feng , Li Sha , Zhao Ying , Wang Xiao Jing , Wu Jian Hui
Published: August 2011

In order to understand the distribution of hospitalization costs and development trends in Steel worker hospital, we used the proportion, the dynamic series and other indicators to analyze the Proportion and the developments of all medical costs spent by inpatients in a hospital during 2002 to 2009. As a result, expenditure on medicine obtained the largest proportion of the hospitalization costs. In the observation period, the proportion of medicine and laboratory tests kept growing, particularly of the medicine costs. While the blood transfusion costs decreased. The results indicated that we should focus on medicine costs firstly and then on laboratory tests fees to control the growth of hospitalization costs of steel workers.
Integrated Automation Monitoring System in the Application of 220kV Substation
Authors: Yan Yan , Ma Xing Hua , Ji Fei Fei
Published: August 2011

This paper introduce a substation integrated automation control system of 220kV structures, characteristics and functions of the system, which discuss and analysis the engineering problems in practical application and points out the system still must perfect place, and put forward to some suggestions of the system construction.
Application of GM (1, N) Model on Slope Stability Analysis in Open Pit Mine
Authors: Guo Jun , Gan De Qing , Zhang Yu , Zhang Wei Hang
Published: August 2011

The paper analyzed major factors that influence the stability of open-pit slope and established the GM (1, N) model based on the program of Xingshan strip mine, which provided an effective method for evaluating the slope stability.
Analysis of Energy Consumption Efficiency Based on DEA-Tobit
Authors: Jia Zheng Yuan , Li Chuan Cai , Yuan Di
Published: August 2011

This template takes the data of energy consumption indicators in Jiangsu Province from 1996 to 2009 as the object of study, evaluated its energy efficiency and analyzed the influencing factors using DEA-Tobit model. The conclusion believed that the energy efficiency has a downward trend in Jiangsu Province after 2000. The energy efficiency has positive correlation with population, fixed assets investment and energy consumption.
The Design of a Central Air Conditioning System for a Rebuilt Commercial Building
Authors: Zhou You Yuan
Published: August 2011

An example of a central air-conditioning project of a rebuilt department store is described in this paper. The design of air system, water system, layout and operations for the air conditioning system is presented in this paper. The system is different form ordinary ones because the floor height is lower; so many special considerations must be taken during the design. In addition, the low cost and easy maintenance place an important role in the design. The operational result of the design is promising and it can be referenced by other designers.
Analysis of Total Factor Energy Efficiency of Manufacturing Industry in Shandong Province Based on Malmquist Index Empirical Study
Authors: Jia Zheng Yuan , Li Chuan Cai , Yuan Di
Published: August 2011

This document takes the 30 completely state-owned manufacturing industry professions in Shandong Province as the object of study, has surveyed the total factor energy efficiency, the technology advancement index and the technology efficiency index of the manufacturing industry with the Malmquist productivity method. The conclusion believed that the value of the manufacturing total factor productivity in Shandong Province is relatively stable in recent years. Light industry or heavy chemical industry which is labor-intensive has lower total factor energy efficiency in various industries.
Decoupling Analysis of Economic Growth and Total Primary Energy Supply for the BRICS: 1971-2008
Authors: Wang He Ming , Yue Qiang , Lu Zhong Wu
Published: August 2011

The decoupling conditions of GDP and Total Primary Energy Supply (TPES) for the BRICS in the period 1971-2008 were analyzed. It is concluded that in the studied period, the decoupling indicators of China and Russia are relatively higher than that of Brazil, South Africa and India. The BRICS’s decoupling distribution is similar to China, because China accounts for most part of TPES and GDP of the BRICS. To restrain the total resource or energy consumption from increasing too fast, it is suggested to match the indicators of GDP growth and the decreasing rate of resource consumption per unit of GDP appropriately.
Comparative Study on Carbon Emission and Energy Consumption of the Textile Industry in Henan Province
Authors: Li Hong Yan
Published: August 2011

Selects 9 industries as the comparison of textile industry, estimates the and the industry's carbon emission amount in China and energy consumption levels in Henan Province in recent years, and compare the energy consumption levels of Henan in 2007 and 2008 with the other central provinces: Hunan Province, Jiangxi Province and Shanxi Province. The results show that: in China, the carbon emission of textile industry is less, but in Henan Province is relatively large. Especially in these two years, there is rapid growth in energy consumption of textile industry, which results in great pressure on the environment. Finally recommend to implement energy saving and realize low-carbon economy.
Experimental Research of the Anodic Bonding in the Si-Glass-Si 3-Layer Structure
Authors: Liu Xiao Wei , Tang Jia Lu , Chuai Rong Yan , Zhang He
Published: August 2011

3-layer anodic bonding is one of the key technologies in the manufacture of complicated structure. The microcosmic process and current model of the 3-layer anodic bonding was investigated, and a new technology scheme with better bonding effect was developed. Using the experiment device, quantities of bonding current curves were obtained by the data collecting system. Under tensile testing device, intensity of the bonding was tested. By analysis of the data collected, the 3-layer bonding model was inspected, and the efficacy of the new technology scheme was proved.
Influence of Depositing Parameters on Microstructure of Ni-Co Pulse Plating
Authors: Gao Ji Cheng , Jin Hui Ming , Zhang Ji Qun , Shi Jun , Li Lu
Published: August 2011

Influence of the pulse currents, the pulse frequency and CoSO4 content of plating solution on Co content of Ni-Co alloy coatings are investigated by environmental scanning electronic microscopy and field emission scanning electronic microscope. The result shows that Co content of Ni-Co alloy coating increases as the increase of CoSO4 content and pulse frequency. Co content of Ni-Co alloy coating increases when the current density decrease. When CoSO4 content of plating solution and the pulse frequency increase, the coating surface become smoother, microstructure become denser and coating grain refinement. when current density is small, coating crystalline grains size are tiny and the coating crystalline grains arrangement is relatively close. In the Ni-Co electrodepositing process, the combining of Ni2+ and Co2+ generates [CoNi (Ⅱ)] intermediate products, then the decomposion of [CoNi (Ⅱ)] generate Co and Ni2+. This hinders sedimentation of Ni2+ ions and increases sedimentary speed of Co2+ ion. Polarization of electrodeposited cobalt is lager than polarization of electrodeposited nickel. So as the current density increases, nickel deposition relative faster than cobalt, thus leads to the cobalt content of coating decreased. The recovering frequency of metal ion concentration in pulse spread layer rise at the fixed time as pulse frequency increases.
Fine Particle Dispersion and Deposition in Three Different Square Pore Flow Structures
Authors: Li Qi , Dai Chuan Shan , Jiao Wen Jing
Published: August 2011

This paper investigates numerically the motion and deposition behaviors of micro- or nano-scaled particles in fluid passing three different kinds of square pores. The three kinds of square pores represent different pore structures in porous medium. The flow fields are numerically simulated by lattice Boltzmann method (LBM). The computation procedure code was validated by comparing the results with those of the previous works for the case of particle fluid passing a square block in a two dimensional channel flow. The results show that the dispersion of particles in three different square pore structures are much different, and vary with Stokes numbers for the same square pore even the Reynolds numbers are the same. In addition, the number and the position of deposited particles are analyzed. It shows that the deposition characteristics of each wall are mainly influenced by Stokes number, Reynolds number and the pore structure.
Some Research on the Medical Materials
Authors: Li Hui Lan , Zhou Lei , Sun Chun Ling
Published: August 2011

Curriculum, teaching methods, clinical practice ability, dissertations and assessment methods were investigated to discuss and analyze the present cultivating situation and its problems of clinical professional degree graduates in order to provide the basis for reform of cultivation modes. Methods: Clinical professional degree graduates, supervisors, training institutions and employing units were treated with sample surveys, interviews and literature research. All the data were dealt with statistical analysis. Results: The cultivation mode of clinical professional degree graduates has been constructed gradually. But there still existed some difficulties and problems in terms of course construction, cultivation methods and assessment system and so on, which were needed to be strengthened.
Temperature Compensation of RLG’s Bias Based on LS-SVM
Authors: Wei Guo , Zhang Peng Fei , Jin Xun , Long Xing Wu
Published: August 2011

. Bias of ring laser gyro (RLG) changes with temperature in the non-linear way, which is an important restraining factor for improving the accuracy of RLG. For the deficiency of least squares regression and neural networks, a new method of temperature compensation of RLG’s bias was proposed, that is, building function regression model by using Least Squares-Support Vector Machine(LS-SVM). Static and dynamic temperature experiments of RLG’s bias are carried out. The results show that: after static temperature compensation, the maximum error of RLG’s bias has dropped from 0.0413º/hr to 0.00073º/hr; while after dynamic temperature compensation, the gyro precision has increased from = 0.0102º/hr to = 0.0011º/hr. It indicates that this method has improved the laser gyro’s accuracy considerably.
Gas-Sensitive Behavior Based on Charge Transfer Processes of a Novel Polyoxometalate (POM)/TiO2/SiO2 Composite Film
Authors: Li Dan Feng , Liu Yan
Published: August 2011

The POM/TiO2/SiO2 Supermolecule composite based on POM films were synthesized via an easy liquid phase deposition method (LPD) at low processing temperature for the first time and employed for studying the charge transfer processes between the film and ambient atmospheres. Here the POM is the Keggin type lacunary FeW11O399- (FeW11) polyanion. Gaseous adsorption properties of the films to noxious gases such as NH3 show that the composite is much better than that of the TiO2/SiO2 films, which may be attributed to the enhancement of the gaseous adsorption ability on the film surface as well as the modified charge transfer process between the adsorbed gases and the films due to the inducing of POM into TiO2/SiO2 matrix. In addition, more importantly, compared with the TiO2/SiO2 films, the POM/TiO2/SiO2 films showed relative faster response and recovery time at optimal working temperature of 440 K, indicating that the films have great potential to be designed as gas sensor used at low temperature.
Application of FXL Series High-Speed Gilling Machine on Flax Short Spinning
Authors: Wang Rui , Ji Yi Ping
Published: August 2011

Selection and configuration of equipments in flax short spinning, performances of FXL series gilling machine, and its main parameters during processing were introduced in this paper. Discussion was also made on quality of sliver, machine operation and its deficiencies. Results show FXL series gilling machine could be used to produce flax short spinning generation-change products.
DNA Electrochemical Biosensor Based on Chitosan and Gold Nanoparticles Using Methylene Blue as Electrochemical Indicator
Authors: Zhang Ai Chun , Zhou Cun
Published: August 2011

In this paper, a novel DNA electrochemical biosensor based on layer-by-layer self-assembled technology was reported. Gold nanoparticles were firstly immobilized on chitosan modified gold electrode by large amino of chitosan because of strong electrostatic adsorption effect between amino and gold atom, and thoil group modified DNA (SH-ssDNA) probe sequence was then self-assembled onto the electrode. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were applied to investigate the electrochemical behavior of different modified electrodes with methylene blue as hybrid indicator. The results in optimization experiment condition show that: The peak current difference value pre and post hybridization was linearly related to the logatithmic value of the target DNA concentration ranging from 10-8~10-5mol/L.A detection limit of 3.55×10-9mol/L can be estimated.
Converse Magnetoelectric Coefficient of Terfenol-D/PZT/Terfenol-D Laminated Magnetoelectric Composite
Authors: Zhang Na , Wang Bo Wen , Huang Wen Mei
Published: August 2011

The converse magnetoelectric coefficient (CME coefficient) of LT（The magnetization direction of Terfenol-D is vertical with the polarization direction of PZT) Terfenol-D/PZT/ Terfenol-D magnetoelectric composite is calculated by means of equivalent circuit method. The CME coefficient equation shows that ME coefficient is decided by performance parameters and the volume ratio of Terfenol-D and PZT. The calculation results predict that when the PZT thickness ratio n is 0.44, the maximum CME coefficient is 0.047G/V. And the equation is applied to the CME coefficient calculation of the same specifications and different structure of LT laminate magnetoelectric composites.
Effect of Binder Materials on Magnetic Properties of Amorphous Fe78Si9B13 Powder Core
Authors: Tang Jian , Lian Fa Zeng , Yu Min
Published: August 2011

The different binder materials and additive amount affected the magnetic permeability, quality factor and losses of amorphous Fe78Si9B13 powder core are studied. The results show that the category and additive amount of binder have strong effects on the magnetic properties of the powder core, in which 2% of epoxy resin binder addition is the best.
Research on Preparation and Properties of Fe-Si-Al Soft Magnetic Composites
Authors: Li Qing Da , Dong X.W. , Liu T.X. , You Jun Hua , Lian Fa Zeng
Published: August 2011

The Fe-Si-Al soft magnetic composites were produced by cold pressing of water-atomized Fe-Si-Al powder using organic binder. The effect of shaping pressure, annealing temperature, magnetic annealing and dielectric content on properties of Fe-Si-Al soft magnetic composites was investigated. The results showed that increasing shaping pressure increases density and radial crushing strength of Fe-Si-Al soft magnetic cores, and decreases coercivity and total loss. Increasing annealing temperature can increase effective permeability and decrease total loss owing to decreasing hysteresis loss, and over-annealing (＞660°C) can deteriorate magnetic properties. The magnetic annealing can decrease total loss of Fe-Si-Al magnetic powder core. Increasing dielectric content can reduce the eddy current loss of Fe-Si-Al magnetic powder core and decrease the real part of permeability. Fe-Si-Al magnetic powder core with shaping pressure of 1800 MPa, annealing temperature of 660 °C and dielelctric content of 0.7% presented the optimum magnetic properties with an effective permeability of 127, a total loss of 78mW/cm3 and a radial crushing strength of 18MPa.
Synthesis, Characterization and Photocatalytic Property of Magnetic Titania Hollow Sphere Composite
Authors: Zhang Cong , Hou Rong , Zhang Hui
Published: August 2011

The magnetic anatase titania (TiO2) hollow spheres have been fabricated as magnetic photocatalyst by template (polystyrene)-sacrificed method, in which cobalt ferrite and titania was sequentially deposited on the surface of polystyrene spheres via coprecipitation and sol-gel process followed by calcinations. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) were employed to characterize the products, and the photocatalytic activities were evaluated by photodegradation of methyl orange (MO) under UV illumination. The results indicate that the as-prepared magnetic titania hollow spheres exhibit magnetic property and high photocatalytic activity.
The Surface Weak Magnetic Signals of Low Carbon Steel under Cyclic Loads
Authors: Yuan Jun Jie , Zhang Wei Min
Published: August 2011

The magnetization induced by applied cyclic stresses on low carbon steel samples was studied through experiments by using a high sensitive magnetic sensor. The stress-magnetic coupling under cyclic tensile stress was researched during static, cyclic and fatigue loading process respectively. The results indicate the consistency and also some contradiction with existing conclusions of metal magnetic memory theory or magneto-mechanical researches. It is put forward that the stress induce magnetization is dependent on both applied stress and micro structure abnormality in ferromagnetic materials. Then the potential applications of the stress-magnetic coupling behavior were proposed.
Mechanical Alloying for Fabrication of Fe50Ni30B20 Amorphous Alloys Powder
Authors: Wang Ge , Chao Zhi Gang , Zhu Yu Ying , Hu Dong Dong , Wang Xing Hua , Li Qiang
Published: August 2011

Fe50Ni30B20 amorphous Alloys powder was prepared by mechanical alloying (MA) with a high-energy planetary ball mill. The composition and non-crystallization changing process of the as-milled powder were studied by X-ray diffractometry (XRD). The microstructure and shape of the amorphous alloys powder was observed by scanning electron microscope (SEM). Thermodynamic properties and crystallization kinetics behavior of the as-milled amorphous alloys powder were measured by differential scanning calorimeter (DSC).
The Design and Simulation of a Switch Reluctance Motor for the Transmission Auxiliary Start up and Brake
Authors: Liu Ben Dong , Li De Sheng , Yang Jia Hui , Cai Ping
Published: August 2011

The equipment structure of auxiliary start up and brake for transmission is designed in this paper. The switch reluctance motor is selected because its advantages. The reluctance motor for transmission is designed roughly with empirical formula firstly. The characteristics of the switch reluctance motor are simulated with the design software of the Rmxprt for rotating motor. The power of the switch reluctance motor be designed is 26.85 kW with make full use of installation space. The software simulation results are close to the empirical design.
Characterization of TiO2 Film Prepared by Sol-Gel Method Using Ti(OC4H9)4
Authors: Yang Li Li , Bai Jia Wei , Zhang Wen Jie
Published: August 2011

TiO2 film was dip-coated on glass substrate by a sol-gel process. Ti(OC4H9)4 was used as the titanium source. Surface morphology, crystallite phase, UV-Vis transmittance spectrum and pore size distribution of TiO2 powder prepared under the same conditions of the film were investigated. Surface of TiO2 film is fairly smooth with very slight roughness. No obvious hole or pore is found on the surface of the film. The strongest diffraction peak situated at 2θ=25.3o is the characteristic of anatase TiO2. The absorption edge of the TiO2 film is around 350 nm, while the transmittance fluctuates between 50% and 90%. The average pore size of the TiO2 particles calculated by BJH method is 23 nm. The total pore volume and specific surface area are 0.16 ml/g and 27 m2/g, respectively.
The Logarithmic Amplifier with I/O Characteristic Approaching Horizontal Line
Authors: Wang Heng , Liu Gui Hua
Published: August 2011

A special logarithmic amplifier, which input signal dynamic range is 0-90 dB and output signal dynamic range is 1-1.2 times, is described in the key point of the current design compared with conventional methods. The I/O characteristic of the logarithmic amplifier shows approximately a horizontal line. Instead of the main intermediate frequency amplifier circuit with automatic gain control of radar, the special logarithmic amplifier was applied to track the plane and test it in airport. It is superior to common automatic gain control circuit for its much lower failure rate, inexpensive in some occasion, especially the perfect function of anti-jamming ability. Experimental results and data analysis illustrating the performance of the design are presented. Meanwhile, this circuit can be applied in military and civil products that need automatic control system of open loop.
Simple Synthesis of Micrometer Fe3O4 Particles with Controlled Magnetic Behaviors
Authors: Zhao Gui Zhe , Zhou Xing , Liu Ya Qing , Sun You Yi
Published: August 2011

Fe3O4 particles were prepared by the co-precipitating method in the presence of polyethylene glycol (PEG). They were characterized by the Transmittance electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscope, which indicate the formation of spherical Fe3O4 particles with a wide range of sizes (up to 200 nm in radius) and the polydispersity of particle size below 20%. Furthermore, the magnetic properties of Fe3O4 particles were measured using a vibrating sample magnetometer (VSM), indicating that the particles possess high saturation magnetization at room temperature. These results are attributed that the Fe3O4 particles were directly coated with PEG in a seeded growth Sto¨ber process.
Three-Dimensional Automatic Measurements System for RFID Magnetic Field
Authors: Hu Wei Dong , Wu Pei Juan
Published: August 2011

RFID has been applied extensively, but there is no an effective method to measure the electromagnetic distribution above the reader. In order to give the accurate value of the electromagnetic field, a three-dimensional automatic measurements system is designed. Both theoretic simulation and experimental measurements have shown that the system will play an important role in RFID technology.
Modeling and Simulation of the Membrane-Type Actuator Based on E-ACE
Authors: Zhu Xi Lin , Hui An Feng , E Shi Ju , Cao Jian Bo , Zhu Li Hui
Published: August 2011

E-ACE material membrane drive is studied. Firstly, the three existed strain energy function model are analysised by theroy under uniaxial tension and biaxial tension，then building model and simulation study for it with ANSYS software to compare to experimental results. The result indicate that their curve are almost same.
The Transition from Normal Ferroelectric to Relaxor Ferroelectric and Evidences of Polar Nanoregions Combination in Sr1-xPbxTiO3
Authors: Wei Tong , Yan Hui Yu , Chen Yi Fei , Qi Xue Lian , Guo Song Qing , Zhao Chuan Zhen , Liu Jun Ming
Published: August 2011

We synthesize polycrystalline Sr1-xPbxTiO3 (SPT) (0<x<0.3) samples by solid-state reaction method. The transition from typical ferroelectric state to relaxor ferroelectric phase is demonstrated with decreasing x by using HP4294 impedance analyzer. Most importantly, we display the dynamics of local polarized nanoregions and evidences for the combination of polarized nanoregions through low temperature dielectric, Raman, polarization, and pyroelectric current measurements.
Novel DNA Electrochemical Biosensor Using Anthraquinone-2-Sulfonic Acid Sodium Salt as Hybridization Indicator
Authors: Ma Mei , Fan Xiao Ping , Dai Zhao , Wang Xiao Qing , Zhang Qing Yin
Published: August 2011

A novel DNA biosensor based on layer-by-layer self-assembled multi-walled carbon nanotubes (MWNTs) functionalized with a mercapto group (SH-MWNTs) and gold nano-particles (GNPs) was presented, where anthraquinone-2-sulfonic acid sodium salt (AQMS) was used as hybridization indicator. The differential pulse voltammetry responses demonstrated that this DNA/GNPs/SH-MWCNTs/Au biosensor was enabled to specifically detect the single-base mismatch DNA sequence in phosphate buffer solution with pH 7.4 containing 0.3 mol/L Na+ and 1.0 mmol/L AQMS. The result showed that when the target DNA concentration was 1.0×10-10 to 1.6×10-5 mol/L, the cathodic peak current of Au electrode system with AQMS as indicator was linearly related to complementary NDA concentration, and the detection limit was about 3.82×10-11 mol/L and had good stability and specificity.
Research on FBG in 3-D Braided Composite Structure Health Monitoring
Authors: Ding Ming Wei , Wan Zhen Kai , Ma Yong Xin
Published: August 2011

In this work, the application status and significance of Fiber Bragg Gratings（FBGs） and Three-dimensional (3-D) braided composites were briefly introduced, so were the fundamental structure of 3-D braided composites and the sensing mechanism of FBGs in them. Combined with the characteristics of 3-D braiding technology, this paper presents a primary theoretical solution for synchronously monitoring temperature and strain inside Three-dimensional (3-D) braided composites, and further analysis were made about it. It was shown by experiment that the application of FBGs in the structure health monitoring in 3-D braided composites has great potential.
A New Model of Discribing the Band Gap Bowing of III Nitride Alloys
Authors: Zhao Chuan Zhen , Yu Li Yuan , Tang Chun Xiao , Li Ming , Zhang Jian Xin
Published: August 2011

In the paper, a model is developed to discribe the band gap energy of Ⅲ nitride alloys. A new parameter A is used to discribe the band gap bowing. The new bowing parameter A is obtained by fitting the experimental values of the band gap energy. AAlGaN =0.46, AInGaN =0.59 and AInAlN =1.90 are obtained by fitting the experimental values of the band gap energy for AlGaN, InGaN and InAlN, respectively. The model is also suitable to discribe the band gap energy of other Ⅲ-Ⅴ ternary alloys.
DNA Electrochemical Biosensor Based on Au Nanoparticles Self-Assembled Au Electrode
Authors: Liu Yan , Dai Zhao , Xu Shi Chao , Zhang Ji Mei , Zheng Guo , Zhang Qing Yin , Chen Guang Ping
Published: August 2011

A novel electrochemical DNA biosensor system based on Au nanoparticles (AuNPs) modified Au electrode and anthraquinone-2,6-disulfonic acid (AQDS) as hybridization indicator was presented in this paper. AuNPs with different particle sizes were prepared from gold chloride by reduction, and self-assembled on Au electrode (AuNPs/Au electrode) by cysteamine as linker. Then, 5’ end –SH modified DNA (HS-DNA) as nucleotide probes were self-assembled onto the surface of AuNPs modified Au electrode (HS-DNA/AuNPs/Au electrode), and the HS-DNA/AuNPs/Au electrode could detect target DNA (completely complementary with HS-DNA). Because AuNPs were on Au electrode, the surface of Au electrode was increased. Therefore, this would result in the increase of electrochemical signal and increase the sensitivity of biosensor. If a completely complementary single stranded DNA (ssDNA) as target existed in the detection system, the cathodic peak current (△Ip) of AuNPs modified Au electrode was increased about 3 times than the HS-DNA/AuNPs/Au electrode because of the hybridization between HS-DNA and complementary DNA target and the formation of double stranded DNA (dsDNA), and if the target was a mismatching base-pair with HS-DNA, the electrochemical signal of electrode would have no obviously change. These results showed that this DNA biosensor system based on AuNPs self-assembled Au electrode had an excellent sensitivity with a complete complementary DNA sequence.
3D Numerical Simulation of Point Impact Breakage of a Glass Ball
Authors: Yang Yun Chuan , Wang Xu
Published: August 2011

Based on the 3D plane impact and 2D MCA numerical simulation, the 3D ANSYS/LS-DYNA software is applied to conduct numerical simulations on two kinds of impact breaking process of a glass ball, during which spallation phenomenon occur. The Von Misses stress of each node changes with the time as the result of the stress waves spreading, reflecting and overlapping within the material. The stereograms and profiles from the simulation results reveal that the stress of each node changes with the time. By comparing the simulation results of plane impact and 2D point impact, differences and similarities between these processes are illustrated in this paper, which reflects the complexity of mechanics in the processes.
Surface Quality of Pulsed Laser Cutting of Difficult to Machine Steel
Authors: Li Tie Jun , Tang Jing , Yan Li Jun , Wang Yang
Published: August 2011

This paper presented the experiments of Nd:YAG pulsed laser cutting of titanium alloy, super-alloy and stainless steel sheet, and investigated the influences of different laser cutting parameters on the surface quality factors focusing surface morphology. In comparison with air-, argon- and nitrogen-assisted laser cutting, argon-assisted laser cutting comes with unaffected surface quality and is suitable for laser cutting with subsequent welding requirement. With analyzing the interaction between pulses overlapping rate and energy, the results show that medium pulse overlapping rate and lower pulse rate helps to improve the surface roughness with pulsed laser cutting. And the results would be beneficial to find optimum cutting parameters for good separation surface.
The TPB and Tribological Properties of Short Carbon Fiber Reinforced Polyimide Composite
Authors: Cai Zhi Yong , Bao Jun
Published: August 2011

The interfacial interaction of carbon fiber reinforced polyimide(PI) composites is a very important issue because it is one of the key factors to influence the mechanical properties of materials. In this article, the interfacial interaction among the components in the composites has been studied by three point bending tests. The fracture surface analysis showed the fiber matrix interface dominates the mechanical and tribological properties.
Carbon Nanotube Templated Growth of Nano-Crystallinity ZSM-5
Authors: Tang Ke , Hong Xin
Published: August 2011

MFI-type(ZSM-5) zeolite nanocrystals with SiO2/Al2O3ratios of 100 has been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with internal diameter of 20~30nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) and scanning electron microscope (SEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites. Compared with those of the corresponding sample synthesized in hydrothermal system, the bands of the nanosized sample are shifted slightly to lower or higher wavenumbers. The TEM images of the purified carbon nanotubes and nanosized ZSM-5 crystals after the removal of the carbon matrix suggest that clean and homogeneous carbon nanotubes have internal diameters of approximately 20~30 nm and the most crystal sizes are in the range 30~60nm. The SEM photograph verifies the existing of nanosized ZSM-5.
Study on Web-Based Collaborative Design of Air-Hydraulic Intensifier
Authors: Xie Hong Jie , Guo Hong Wei
Published: August 2011

In this paper, CAD technology and the network technology were unified, which used ASP technology to construct the different network coordination platform. The platform implemented air-hydraulic intensifier coordination design based on the network. Air-hydraulic intensifier design system realization based on the network and the key technology were described.
Discussion on Binding Additives and Binding Process in Selective Laser Sintering
Authors: Xie Wen Juan , Zhao Wei Ling , Zhang Jia , Liu Jin Hui
Published: August 2011

Binding additives used in selective laser sintering (SLS) of metal powders determine the vital performance of untreated metal prototypes. The types of polymer binding materials were presented in this work. The binding conditions and processes were represented. The thermal variations of binding additives and interfaces actions between polymer and metal were discussed. This work provides a reference for the selection of polymer binding additives in SLS.
Preparation of High Surface Area Anatase TiO2 by a Low Temperature Hydrothermal Process
Authors: Gao Mei Zhen , Zhang Zhi Rong , Li Wen , Liu Wen Bao , Yang Bing Jun
Published: August 2011

Pure anatase TiO2spheres with mesoporous structure were prepared by a simple urea assisted hydrothermal process at low temperature. The characterization of TiO2was examined by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N2adsorption-desorption and ultraviolet visible spectrophotometer (UV-VIS). The TEM and N2adsorption-desorption results confirmed that TiO2spheres has a mesoporous structure. The surface area of TiO2annealed at 400 °C is up to 302.3 m2/g with average pore diameter about 4.1 nm. While after annealed at 500 °C, the average pore diameter of TiO2is about 6.8 nm, but the surface area reduces to 142.6 m2/g
Structure Analysis of Hybrid Self-Reconfigurable Modular Robot
Authors: Fei Yan Qiong , Yang Wei , Yu Jiang
Published: August 2011

Self-reconfigurable modular robots consist of many identical modules. By changing the connections among modules, the whole configuration of the robot can transform into arbitrary other configurations. In this paper, a hybrid self-reconfigurable modular robot is designed, which is composed of a master module and a slave module. Then, the docking process is analyzed with the geometric method. The docking states between two modules are presented. It is a complicated multi-peg-in-hole process.
Nano-Particle Manipulated with Near-Field Optical Tweezers
Authors: Tang Jing , Yang Li Jun , Liu Bing Hui , Wang Yang
Published: August 2011

By applying the direct calculation of Maxwell stress tensor using three-dimensional finite difference time domain method, the feasibility of using a metal-coated fiber probe to create near-field optical tweezers is investigated. Numerical results indicate that these schemes are able to trap nano-particles with lower laser intensity than that required by conventional optical tweezers. The near-field optical trapping systems that are more flexible than conventional optical tweezers are built. In experiments, 120-nm polystyrene particles are trapped in a multi-circular shape with a minimum size of 400 nm. The realization of trapping particles in the range of tens of nanometers largely promotes the role of near-field optical manipulation at the nanometer scale.
Simulation Analysis of an Eddy Current Sensor Array Based on Finite Element Method
Authors: Du Jin Qiang , He Yu Ting , Ding Hua , Zhang Hai Wei , Wu Li Ming
Published: August 2011

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of crack length and frequency on sensor’s output characteristics are analyzed by this model. It is shown that the model established in this paper is reasonable. There would be a change on amplitude and phase when a crack appears below the footprint of sensing coil in metal plane, and the amplitude and phase of sensor coil are increasing gradually as crack propagation. As frequency increased, the differences between the sensing coils’ output become obvious. However, the differences begin decreasing while the frequency above 3MHz approximately. These results will provide a reference for further research and application of the sensor.
Application of Yolico YD5200 Frequency Converter in Mine Hoist
Authors: Chen Guo Jie , Wang Chun Xia
Published: August 2011

The application of Yolico YD5000 series YD5200 frequency converter in mine hoist is presented. The parallel Yolico YD5200 energy feedback unit is adopted to overcome the traditional hoist disadvantages, such as discontinuity of running speed and being unsatisfied with speed adjustment. From the local records of debugging, hoist system running steady, the design requirements are satisfied.
Effect of Bending Direction on Springback of High Strength Steel Sheet
Authors: Premanond Varunee , Kaewtatip Pongpan , Moolsradoo Nutthanun , Khantachawana Anak , Lawanwong Komgrit
Published: August 2011

Anisotropic behaviors of high strength steel grade SPFH590 and HPFC780 used extensively in automotive industry are explored. V-bending tests were carried out on various bending direction. It was found that the investigated material showed little differences in the resistance to deformation and resistance to thinning from all directions. Thereafter, negligible effect of the bending direction on the degree of springback was detected. Large bend radius caused high level of springback. However, the increasing rate of springback is decreased with larger radius.
Underground Tunnel Development Survey of Shield Tunnelling Machine
Authors: Chang Xue Sen
Published: August 2011

In this paper, the technology based on site investigation adequately, through reading, analysis and comprehensive vast literature of shield lining segments, installed spelling were analyzed, and the conclusion that some valuable conclusions. Summarizes the construction process of shield technology, and introduces the earth pressure balance type shield construction machine structure and working principle. Shield technology is with modern transportation, underground engineering, mining, water conservancy projects and municipal construction needs and developed advanced tunnel construction technology. With China's urban underground transportation facilities, the quickening of the process of shield technology has become the hotspot of domestic engineering.
Study on Identification Method of Geometric Parameter Errors of 6-DOF Parallel Machine Tool
Authors: Shan Peng , Xie Li Yang , Shi Jia Liang , Sun Ming Fei
Published: August 2011

A computational model for position and posture error of 6-DOF parallel machines is proposed based on D-H transformation matrix and the inverse kinematics. The model is used to construct a linear least-square identification model for geometric parameter errors. Error identification program and compensation method are also presented. Simulation results indicate that the effects on position and posture of machines are almost equivalent from calculated least-square solution and from real values. The pose error of moving platform can be decreased up to 90% if error compensation is performed by modifying the input kinematic parameters of driving joints.
Research on Seamless INS/GPS Integrated Navigation Algorithm
Authors: Xu Tian Lai , Tian Yang
Published: August 2011

This paper proposed and discussed an INS/GPS integrated navigation method based on radial basis function neural network (RBFNN) to fuse INS and GPS data. When GPS signals were available, an adaptive Kalman filter was used to improve the estimation accuracy of INS errors, and then the RBFNN structure was trained to mimic the dynamical error model of INS. If GPS signals were unavailable, the trained RBFNN structure was utilized to bridge the GPS outages to achieve seamless navigation. Simulations in INS/GPS integrated navigation system showed the proposed method can reduce the positioning error during GPS outages.