bluuebunny/crossref_metadata_2025 huggingface dataset:
Vibration Analysis and Optimal Design in Hydraulic Leveling System
Authors: Gao Qiang , Zhang Meng
Published: September 2012

In the process of launching, some launch bearing platforms will bear large impact force, thus causing severe vibration of the platform. There exists coupling relationship between this kind of vibration and the hydraulic system. In this paper, we established the vibration model according to the coupling vibration system in bearing platform and hydraulic system, and realized decoupling. Then we derived the vibration controlling equation and transfer function of coupling vibration between bearing platform and hydraulic system. Further more, we simulate the actual situation in software Simulink, and it gave vibration response curves under different parameters. In this way, it provides basis for reducing platform vibration.
A Review of Man-Machine Interface Design Research in China
Authors: Sun Ying Li
Published: September 2012

Talking from the meaning and importance of man-machine interface design, this article analyzes the current development situation of electronics’ man-machine interface market in our country, combines and further dissects the problem of man-machine interface development in our country, discusses the development tendency of man-machine interface through the analysis of the main principles of man-machine interface design, and draws a conclusion that “the interactive mode of basing on nature” of the “man machine harmony”and“human-centricaccommodation” is the inexorable trend of future development.
Finite Element Model and Analysis for Micro-Cutting of Aluminum Alloy 7050-T7451
Authors: Wang Fu Zeng , Sun Jie , Sun Pei Qin , Zhou Jun
Published: September 2012

In this paper, a finite element model with respect to actual state of micro-cutting is established by adopting software of ABAQUS/Explicit. Based on the FE model, the cutting force and specific cutting force with various uncut depth of cut with different cutting edge radius are compared and then analyzed with regard to this simulation. In micro-cutting, the nonlinear scaling phenomenon is more evident with the decreasing of uncut chip thickness. The likely explanations for the size effect in small uncut chip thickness are discussed in this paper.
Early Stages of the Wear Behavior of AISI 440C Stainless Steel under Rolling Contact in Water
Authors: Honda Takashi , Kida Katsuyuki , Santos Edson Costa , Shibukawa Takuya
Published: September 2012

In the present work, rolling contact fatigue (RCF) tests in water were performed on AISI 440C stainless steels under different loading. Each test was interrupted at 3.6×104, 7.2×104, 1.44×105, 2.16×105, 2.88×105 and 2.88×105 rotating cycles and the wear track at different stages was observed by using a 3D laser confocal microscope. The wear loss at 2100 N was a significantly higher compared to 500 N or 1000 N. The contact surface roughness in samples tested at 2100 N increased during the rolling contact and severe adhesion wear was present at the entire surface. In case of 500 and 1000 N tests, the surface roughness remained low with mild adhesion wear occurring. It is concluded that adhesion force levels are higher under high load rolling contact. They greatly influence the surface conditions and cause high wear loss.
Study on Automobile Body Performance of Honeycomb Sandwich Composite Material
Authors: Fan Xue Mei , Wang Jian Feng , Duan Cheng Jin , Xia Xiang Xin , Wang Zhao Hui
Published: September 2012

In order to analyze the mechanical properties of Carbon/epoxy facings-Aluminum honeycomb sandwich structure, we simulated panels of different layers and core thickness using ABAQUS finite element analysis program. And three-point bending tests and shear tests were made on the same panels using electronic universal testing machine. In addition, we also made the same three-point bending tests on steel tubes to get a comparison with honeycomb sandwich panels. It could be seen that, the simulated results were basically identified with experimental results. The results indicated that core thickness played an important role in the panels’ bulking modulus, and number of carbon fiber layers decided the shear strength. As a whole, honeycomb sandwich structure was suitable for use in the car body with good mechanical properties under premise of lighter.
A Method for Predicting the Onset and Expanding of the Damage during CFRP Interference-Fit Joining Process
Authors: Luan Chao , Zhang Kai Fu , Li Xiao Ge , Li Yuan
Published: September 2012

Interference-fit is the main joint mode of the aircraft composite components, however, improper interference-fit percentage will lead to the onset and the expanding of the damage around the hole. Currently, the interference-fit percentage is decided only through experience, and theoretical foundation is lacked. This paper first analyzes the stress condition of the interference-fit joining process, and constructed the stress distribution model based on interference-fit percentage. Based on this, damage onset model is constructed combined with the Yamada criterion, and the damage expanding model is constructed with the help of the Characteristic curve method; Secondly ABAQUS is used to simulate the interference-fit joining process; Finally contrast is made between the numerical and experimental of joints with different diameters, and the result of the contrast shows that the damage region onset and expanding model and the degeneration model are good.
Comprehensive Mathematical Model of Full Oxygen Blast Furnace and its Solution
Authors: Meng Jia Le , Guo Zhan Cheng , Tang Hui Qing
Published: September 2012

A comprehensive mathematical model of full blast furnace with top gas recycling was established. The model consists of the calculation equations for gas composition of four zones (hearth, belly, lower shaft. top) in the blast furnace, the thermo-chemical balance model, the energy balance model of hot stand-by zone of the blast furnace and the shaft efficiency model. By using the model, the new process was calculated. The results show that coke rate and coal rate of the new process are both 200 kg/thm, fuel rate is decreased by 22.8% compared with that of conventional blast furnace. In addition, theoretical combustion temperature decreases with increasing hearth-recycle gas quantity. Increasing of hearth-recycle gas quantity by 10 m3/thm decreases theoretical combustion temperature by 10.0 K. Furthermore, the model could be applied to calculate the operating parameters when the raw materials and fuel conditions are different, and the change laws of operating parameters under the same raw materials and fuel conditions could also be studied with this model.
Microstructure and Mechanical Property along 3D Directions of AZ31 Magnesium Joint Welded by FSW
Authors: Lu Sheng , Xiao Shi Yu , Qi Fang , Chen Jing
Published: September 2012

As-cast AZ31 magnesium alloys was fabricated with travel speed of 50 mm/min and rotating rate of 1500 r/min by means of friction stir welding (FSW). The microstructure and mechanical property of the joint along three dimensions (3D) directions were investigated by optical microscopy (OM) and tensile experiment. The results show that the FSW joint is characterized with asymmetric gradient in 3D. The mechanical properties of the slice decrease from the top to the bottom of joint and starting part is the weakest unit, while middle part corresponds to the strongest one.
Computational Aspects in the Elasto/Viscoplastic Material Behavior of Solids
Authors: de Angelis Fabio
Published: September 2012

In the present paper a computational algorithmic procedure is presented for modeling the elasto/viscoplastic behavior of solid materials. The effects of different loading programs on the inelastic behavior of rate-sensitive materials are analyzed with specific numerical examples. An appropriate solution scheme and a consistent tangent operator are applied which are capable to be adopted for general computational procedures. Numerical computations and results are reported which illustrate the rate-dependence of the constitutive model in use.
Mössbauer and Magnetic Property Study on Cyano-Bridged Complex [Gu(en)x]yMA[Fe(CN)6]z·nH2O(MA=K+)
Authors: Ye Zhong Hui , Lin Qing , Huang Hai Fu , He Yun , Chen Shao Hong
Published: September 2012

The cyano-bridged complexe [Gu(en)x]yMA[Fe(CN)6]z·nH2O(MA=K+) have been synthesized. In the compound [Cu(en)2][KFe(CN)6]·H2O, we shows firstly a weak intramolecular anti-ferromagnetic coupling between Fe3+(ground state 5T2g, S=1/2) and Cu2+(ground state 6T2g3eg, S=1/2) through the long- range cyano bridges. The magnetic susceptibility obey the curie-weiss law [χ=C/(T-θ)] with a negative weiss constant,the curie constant C=0.42cm3·k·mol-1, the compound exists a strong Cu2+–CN–Fe3+ ferromagnetic interaction and a weak Cu2+(ground state 6T2g3eg, S=1/2)–Cu2+(ground state 6T2g3eg, S=1/2) antiferromagnetic interaction, through long range of NC-Fe-CN. At the same time, we have given an explanation from magnetic properties and struction of compounds.
Simulation Study of the Strength of Pick Based on LS-DYNA in Different Hardness of Rock
Authors: Zhang Qiang , Li Shou Ju
Published: September 2012

In order to study strength characteristics of pick when cutting different hardness of rock,according to current situation that actual external load can not be obtained easily and load characteristics can not be grasped correctly, establishing flexible entity model of pick based on LS-DYNA,building constitutive model of rock based on SPH theory.Making simulation for the progress of cutting three different hardness (sturdiness coefficient )of rock to get stress changes and statistical data of carbide cutter head of pick.The results of simulation show: the body of carbide-tipped teeth were severe stress concentration ,while ，the corresponding maximum stress is between 365 ~ 628MPa， it can meet the strength requirements，so damages were caused by fatigue；The results provide the theory basis for studying wreck and improving the woking life of pick.
Synthesis of ZnO Nanoparticle by Solid State Reaction and its Influence on Zinc Electrode
Authors: Wang Hua Qing , Li Rui , Xiang Cheng Xuan
Published: September 2012

Nanosized ZnO was prepared successfully by solid phase coordination chemistry reaction and characterized by XRD and TEM techniques. The results of CV testing indicated that the peak shapes in CV diagrams were differed for the three electrodes when the scan rate was 1 mV s-1. The mixture electrode (sample D) that nanosized ZnO additives were 50% exhibited remarkable cyclic reversibility. The results indicated that the optimum ratio of ZnO additives were 50% by means of constant current charge-discharge. The rechargeability of the Zn electrode could be improved. But the nanosized ZnO were more effective in modifying Zn electrode than the common ZnO particles. Its discharge capacity at 25th and 30th charge-discharge cycle achieves 220 mAh g-1and 198 mAh g-1, respectively.
Optimal Design of Tooth Profile for Sprocket Wheel on No Arching Sintering Machine
Authors: Ren Su Bo , Bai Ming Hua
Published: September 2012

Aimed at the instability factors of no arching sintering machine in the operation, their causes is analyzed, from the theoretical design, the composite tooth profile curve of sprocket wheel is optimized. Combined with the motion characteristics of the pallet car and the conditions required, by choosing proper motional parameters, a unified curve equation of tooth profile is gained. According to the actual size of the sprocket wheel, the two composite tooth shape of sprocket wheel before and after optimization is compared, and the velocity and acceleration characteristics of the composite tooth profile curve are analyzed. The results show that the optimized composite tooth profile curve of the sprocket wheel is more simple and reasonable, and can improve the engagement condition of the sprocket wheel and the pallet car, easy to manufacture, these provide a theoretical basis for the stability operation of no arching sintering machine.
Magnetic Studies in Mixed-Metal Valency Molecule Magnets NBu4FeιιnMnιι1-n[Feιιι(OX)3](n=0.03, 0.10, 0.15, 0.97)
Authors: Lin Qing , Chen Shao Hong , He Yun , Li Xiao Gang , Huang Hai Fu
Published: September 2012

The mixed valency character and antiferromagnetic coupling in Molecule magnets Materials NBu4FeIInMnII1-n[FeIII(OX)3]（n=0.03、0.10、0.15、0.97） were investigated by magnetic measurements.The values of M increase and exhibit weak irreversibility in the field-cooled (FC) magnetization curves. There are a clear bifurcation phenomenon of the field-cooled (MFC) and Zero-field-cooled (MZFC) magnetization curves.In the Molecule magnets Materials NBu4FeII0.10 MnII0.90[FeIII(OX)3],the Ne´el temperature is 34 K.And the Ne´el temperature of NBu4FeII0.15MnII0.85 [FeIII(OX)3] is 28 K.In the sample NBu4FeII0.03 MnII0.97[FeIII(OX)3],,the bifurcation of the ZFC and FC plots below the Ne´el temperature of 30 K indicates irreversibility.The oxalate group has been shown to be an excellent bridging ligand in supporting the magnetic exchange interaction.
Numerical Algorithms for J2 Viscoplastic Models
Authors: de Angelis Fabio
Published: September 2012

An algorithmic scheme is illustrated for the numerical integration of evolutive problems in viscoplasticity. The analysis is restricted for brevity to J2 models in viscoplasticity by presenting a unified treatment of different elasto/viscoplastic constitutive models. An appropriate consistent tangent operator is applied which is suitable to be adopted for general numerical schemes. The treatment can be applied to different constitutive models by simply specializing the flow function. Computational results and examples are also illustrated in order to show the effectiveness of the presented algorithmic procedure.
M-T Transformation Control Synchronization Strategy for Single-Mass Nonlinear Harmonic Vibration System
Authors: Li Xiao Hao , Zhao Qun Chao
Published: September 2012

Based on dynamic model of the single-mass nonlinear harmonic vibration system and the electrical characteristics of two driving motors, the state space equations of the rotate speed and phase for the two driving motors had been deduced, and the harmonic control synchronization condition for the two driving motors had been discussed also. Then, based on the M-T transformation, the control synchronization scheme for the two driving motors to realize the synchronous movement under the conditions that the nonlinear vibration system harmonic vibrated had been designed in the paper. Based on the M-T transformation control synchronization simulation model of the single-mass nonlinear harmonic vibration that established in the paper, and by the simulation experiments, the validity of the M-T transformation control synchronization strategy had been verified.
Mechanical and Microstructural Properties of Al-Added ODS Ferritic Steel
Authors: Lee Jae Hoon
Published: September 2012

18%Cr-oxide dispersion strengthened (ODS) ferritic steels with and without 5%Al have been produced by mechanical alloying and hot-extrusion. The microstructure of the ODS steels has been characterized by means of electron microscopy (SEM, TEM), showing that in the Al-added ODS steel, the semi-coherent and coherent oxide particles are about 75% and 10%, respectively. It was found that the coherency of oxide particles depends on the size of dispersed particles. Tensile tests performed between room temperature and 973 K denote that the ultimate tensile strength of Al-free ODS steel is higher than that of Al-added one. The ductility values of both materials are sufficiently high. Impact tests reveal that the ductile-to-brittle transition temperature of Al-free ODS steel are higher than that of Al-added ODS steel; however, the upper shelf energy of 18%Cr-ODS steel is substantially smaller in comparison to the Al-added one. It is considered that the difference in mechanical properties between Al-free and Al-added ODS steels is caused by the smaller, stable titania + yttria complex oxides dispersed in the Al-free ODS steel.
The Effect of Isothermal Treatment on the Microstructure and Properties of High Performance Steels
Authors: Wang Xue Min , Zhao Yan Qing
Published: September 2012

The microstructure and properties of 600MPa grade steels produced by isothermal treatment has been studied. The influence of isothermal treatment temperature on the microstructure of steels has been investigated by the aid of Optical microscopy and TEM. The results show that after various isothermal treatments the microstructure of steels varies with the isothermal temperature. When the temperature is lower than 530°C the microstructure is mainly composed of granular bainite and lath bainite. Whereas when the temperature is higher than 580°C the polygonal ferrite and quasi polygonal ferrite appears and the microstructure consists of ferrite and fine lath bainite. Since the microstructures are complex and the yield ratio of steels under these conditions are all lower than 0.8. The strength of sample for 630°C isothermal treatment is the highest. The yield strength is over than 800MPa and the tensile strength is over than 1000MPa due to the fine precipitates containing copper. These copper containing precipitates formed during the isothermal transformation by the way of inter-phase precipitation.
Effect of the Inhomogeneity of a Substratum Soil on Longitudinal Settlements of a Shield Tunnel
Authors: Yang Qian , Zhang Jun Xing , Zhang Geng Ning
Published: September 2012

In this paper, we perform a 3D finite element analysis for the longitudinal settlement of a shield tunnel in soft soil, where a substratum soil contains a soft layer. The Mohr-Coulomb model is used for the substratum soil and soft layer. The longitudinal settlements are calculated for different elastic modulus and longitudinal length of the soft layer. The results show that a softer and longer layer will result in the larger settlement. It is also found that the maximum of the longitudinal settlements is linear function of the elastic modulus of the soft layer.
Study on the Pyrolysis Kinetics Characteristics of the Wood from the Ancient Buildings
Authors: Zhang Xiang , Zhang Fan
Published: September 2012

The pyrolysis kinetics properties of three kinds of woods, pinus koraiensis, hemlock and spruce, which were taken from the ancient building, the Potala Palace in Lhasa of China, were investigated by using thermogravimetric analysis method. And the Kissinger method was applied to calculate the degradation activation energy of the lignin of these three kinds of wood. The degradation activation energy of the lignin in pinus koraiensis, hemlock and spruce woods was 218kJ/mol, 146kJ/mol and 188kJ/mol, respectively, which showed that the degradation order from hard to easy for these three kinds of wood was pinus koraiensis, spruce and hemlock.
Effect of Dynamic Loading on Mechanical Properties of Concrete
Authors: Deng Ji Wei , Liu Chang Wu , Liu Jian Feng
Published: September 2012

Concrete structures have to bear dynamic loads in daily work, strength and deformation characteristics of concrete under dynamic loads differ from the characteristics under static loads, and this difference may become a key factor to restrict the structural safety under certain conditions. Using the MTS815 test system, the dynamic uniaxial compression tests of concrete specimens were conducted. The mechanical characteristic parameters of strength, elastic modulus, peak strain and the stress-strain curves at different loading rates of concrete specimens have been studied. The results reveal that concrete is a rate-sensitive material, as a small loading rate may lead to the rapid growth of strength; the variation rule of peak strain is not obvious with the increase of loading rate, thus the peak strain can be regarded as a fixed value in actual projects; the higher the loading rate is, the greater the concrete strength and the elastic modulus are; the elastic modulus increases essentially due to the improvement of structural stiffness; concrete specimens with the same mix proportion have similar stress-strain curves and the loading rate has little effect on the shape of the curve.
Material Mechanical Performance about Worm Bending and Twisting Deformation for Civil Engineering
Authors: Chen Xu Qin , Jiang Gui Lan , Cheng Guang Zhen
Published: September 2012

On the condition of line elastic and small deformation, more than 80% failure of the drive shaft is due to fatigue damage. It relates to the alternating stress of the drive shaft under the combination effect of bending and twisting. When drive shaft is under the combination effect of bending and twisting for civil engineering, torsion shear stress is perpendicular to bending normal stress. They can’t be simply stacked. Combining with the belt conveyor tension device of the worm transmission, first, simplify the external force; do stress analysis in horizontal plane and vertical plane respectively. Then make corresponding bending moment figure and separately calculate the internal force, stress of each basic deformation and make comprehensive bending moment figure and torque figure. Then use the application of superposition principle, the fourth strength theory to calculate worm transmission’s strength. The method makes senses to other transmission mechanism shaft bending and twisting combination strength analysis as a reference.
Study on the Effective Slab Width of Composite Cable-Stayed Bridge under Axial Force
Authors: Wu Xiang Nan , Zhai Xiao Liang , Zhou Ming Min
Published: September 2012

There exist evident shear-lag phenomena in large-span composite cable-stayed bridges under the action of axial force, especially in the deck with double main girders. In order to discuss the distribution law of the effective flange width coefficient along the span, caused by axial force, finite element computations of five composite cable-stayed bridges and theoretical analysis have been performed. The transmission angle of axial force caused by the axial compression of stay cables was given, meanwhile the formulas for computation effective slab width coefficient under axial force were suggested.
Numerical Analysis of Shear Stress on Adhesive Joint between FRP and Steel Structure in Civil Engineering
Authors: Zhang Shu Kuan , Huang Pei Yan , Zhou Hao , Zhao Chuan Yu
Published: September 2012

Fiber reinforced polymer (FRP) is widely applied in the concrete and steel structure reinforcement field because of its high strength and convenient constructability in civil engineering. The adhesive joint is the weakness of the reinforced structure, but with the complicated stress distribution for analytic method. Numerical method provides the best solution to the further analysis. In this paper, a finite element method (FEM) of double lap joint model was established with ANSYS to investigate the shear stress in the adhesive joint of the reinforced structure, the shear stresses were analyzed in detail in both length and thickness direction in civil engineering. The results show that, 1) the FEM calculation results of shear stress of adhesive and the theoretical calculation values are consistent within the main part of the adhesive; 2) FEM is the effective method to further study the shear stress distribution of the adhesive, meshing size has great influence on the results of calculation; 3) to obtain more accurate analysis of shear stress distribution, the non-linear characteristics of the adhesive should be considered
Research on Influence of the Bank Slope on the Acceleration Distribution of the Central Points of Concrete-Faced Rockfill Dam
Authors: Zhou Hui , Hu Ping , Xiao Ren Cheng
Published: September 2012

3-D dynamical response analysis of concrete-faced rockfill dam is presented. Using equivalent-linear model, based on different dam heights and different shapes of river valley, the responses of dam subjected to different seismic intensity inputs have been studied. Especially the systematic analysis about the influence of the bank slope on the distribution of the acceleration at the central points the bank slope is conducted. The results show that, the distribution of the horizontal acceleration along the dam heights at the central points on the central section of concrete-faced rockfill dam performs that the acceleration magnification which increases remarkably over 0.8H is a little smaller during 0~0.8H. For high concrete-faced rockfill dam, with the base acceleration excitations unchanged and the bank slope becoming gentle, the maximum acceleration on the top of the dam reduces. Under various seismic intensities, for non-high dams in the broad river valley the slope has almost no impact on the magnification of the horizontal acceleration.
Study on the Thermal Properties of the Wood from the Ancient Buildings
Authors: Zhang Xiang , Zhang Fan
Published: September 2012

The thermal properties of three kinds of woods, pinus koraiensis, hemlock and spruce which were taken from the Potala Palace, an ancient building in Lhasa of China, were investigated by using thermogravimetric analysis method carried out in air and nitrogen atmosphere. The results showed that there were three degrading stages for three kinds of woods in air, which corresponded to the water loss in woods, the degradation of the hemicelluloses, celluloses and lignin and oxidation of charred residues. However, there were only two degrading stages of the woods in nitrogen atmosphere, which corresponded to the water loss in woods, the degradation of the hemicelluloses, celluloses and lignin, because the charred residues of the wood could not be further oxidated in inert atmosphere.
Effect of NaH2PO4, Na2HPO4, MgSO4, and Ascorbic Acid on Survival of Lactobacillus acidophilus during Freeze-Drying
Authors: Chen He , Ma Zhen Xing , Shu Guo Wei , Qin Tao
Published: September 2012

Effect of NaH2PO4, Na2HPO4, MgSO4, and Ascorbic acid on survival of Lactobacillus acidophilus was investigated before and after freeze-drying. Editing different concentrations of protective agents respectively during freeze-drying. After completion of the pilot, the survival ratio of Lactobacillus acidophilus and the number of viable cells were being measured. Results were as follows: the highest survival rate and the largest number of viable cells was Na2HPO4as the protective agent.
Research on Oxyfluoride Glasses in Material Engineering with Optical Basicity and Electronic Polarizability
Authors: Wang Xiao Li , Yu Da Wei , Han Xu , Zhao Xin Yu
Published: September 2012

In material engineering, oxyfluoride glasses have a great important potential application in NLO. The optical basicity and electronic polarizability of oxyfluoride glasses have been evaluated on the basis of the optical electronegativity. The estimated values are in good agreement with previous experimental values. Furthermore, we introduce optical electronegativity of oxyfluoride glasses to predict the glass transition temperature Tg of oxyfluoride glasses. The present investigation suggests that the glass transition temperature Tg decreases with increasing optical electronegativity.
Study on Indoor Thermal Environment with Building Materials of Urban Residences in Zhejiang Region: Summer Investigation
Authors: Ma Jing Hui , Gao Yan
Published: September 2012

The aim of the present study is to clarify the actual conditions of indoor thermal environment with building materials, which built after 1980 years in urban areas of Zhejiang Province. In this paper, the investigations about building characteristics and indoor thermal environment were carried out in Hangjiahu Plain, Zhenan hills and mountains etc. The results show that the wall materials of the most residential buildings are clay solid bricks, the most windows type is aluminum alloy, and the most buildings are uninsulated. In summer, over half of the air- conditions operate more than 6 hours in residential buildings. The indoor thermal comfort is strongly affected by thermal performance of windows.
The Synthesis and Characterization of ZnO-Tubular Nanostructures
Authors: Xu Shuang , Wang Jian Feng , Zhang Yao Ping , Qiu Chang Li
Published: September 2012

Using Zn nanowires as a self-sacrificed template, hierarchical tubes constructed by zinc oxide (ZnO) nanoflakes and ZnO nanotubes have been successfully fabricated by two different thermal-oxidation modes. The products were characterized by the X-ray powder diffraction, transmission electron microscopy and field-emission scanning electron microscopy. The experimental results show that the formation processes of ZnO nanostructures are sensitive to the growth temperature, which is lower or higher the melting point of Zn (419 °C). Our method provides an easy and convenient way to prepare metal oxides tubular nanostructures with different morphologies through self-sacrificed template method via adjusting the heat-treatment process.
Selective Synthesis and Photocatalytic Activity of PbTiO3 Nanoparticles with Different Crystal Structures
Authors: Li Wei , Zhong Yu Shu
Published: September 2012

Subscript textPbTiO3 nanometre material with distinct crystal phase were synthesized selectively with different Na2Ti4O9 precursors and their photocatalytic activities were investigated for 2-propanol degradation in gas phase.
Preparations and Photocatalytic Properties of Visible-Light-Active Nitrogen-Doped TiO2
Authors: Li Yan Hong , Tan Dong Dong , Bi De Fu , Lu Wei , Xu Shi Hong
Published: September 2012

A visible-light-active N-TiO2photocatalyst was prepared by a simple method: TiN nanoparticles were calcined in the O2/N2atmosphere. The prepared N-TiO2shows high photocatalytic activity for the degradation of methyl orange in water under visible light irradiation. The photodegradation results indicate that the prepared photocatalysts have the best photocatalytic activity when TiN was calcined at 650 °C for 15 min in the O2/N2atmosphere with 1:15 (volume) of O2/N2.
Photophysical Properties and Performance of Semiconducting Block Copolymers
Authors: Guo Li , Zhang Yong Guo , Hu Jian Qiang
Published: September 2012

The covalent incorporation of C60 into one block of a poly(1,4-(2,5-dioctyloxy)phenylene vinylene)-based diblock copolymer resulted in a donor–acceptor diblock copolymer, which demonstrated a very efficient electron transfer upon excitation of the PPV block. The strong quenching of the photoluminescence from the PPV block indicated an efficient electron transfer at the donor–acceptor interface.
Synthesis of an Intumescent Flame Retardant and its Application to Fireproof Coatings of Steel Structures
Authors: Zhang Xiang , Zhang Fan , Yin Chao Lu
Published: September 2012

A phosphoru-nitrogen intumescent flame retardant (SCF101) consisting of acid source, carbon source and gas source, was synthesized by phosphoric acid, phosphorus pentoxide, pentaerythritol and melamine (MA). TGA and SEM results showed that decomposition temperature range of SCF101 was from 100°C to 700°C, and the residual char yield ratio was 30-40%, and the char layer was uniform and compact. As a substitute of traditional flame retardant, namely, ammonium polyphosphate (APP), melamine (MA) and pentaerythritol (PER), the SCF101 used in fireproof coatings of steel structure can improve residual char yield about 10%. The gasoline blowtorch experiments showed that the foam expansion of the coating containing SCF101 was higher, and char layer structure was compact and continuous, while the coating containing APP, MA and PER can not foam uniformly and the foam was cracked under the action of flame.
Test of Solidification Characteristics of Grouting and the Effect on Strata Deformation in Shield Tunnelling
Authors: Zhong Xiao Chun , Qin Wei Ke , Wang Hai
Published: September 2012

Back-fill Grouting is a key procedure for the active control of strata settlement during shield tunnelling in civil engineering. The paper studies the stress - strain characteristics of grouting and the state of grout, which changes from liquid to solid over time and is simulated by variable rigid body. The model of flowing state are divided in four phases from liquid-plastic to rigid state. The paper establish a numerical model of shield tunnelling in civil engineering with the consideration of characteristics of grout deformation, and has analyzed law of strata settlement. The test results show that the calculation method can well accord with the four stages of strata deformation, and can more accurately reflect the process of strata deformation caused by shield tunneling.
Influence of C/N Ratio on SND and Microbiological Analysis in Catching Bed Biofilm Reactor Using Acrylic Resin Fiber as Carrier Materials in Civil Engineering
Authors: Zhang Yan , Yang Zheng Yang , Wang Li Li , Zhao Xu Ying , Liu Huan Guang , Zhu Min
Published: September 2012

In this study, effect of C/N ratio on denitrification were investigated using four sets of parallel catching bed reactors, which were using acrylic resin fiber (ARF) as carrier materials. The results indicate that this process which was used in wastewater treatment of civil engineering can get better COD and nitrogen removing performance. NH4+-N removal rate reduced with the increasing of C/N ratio, and the average removal rate of COD and the total nitrogen (TN) increased when C/N ratio is increased. When C/N ratio exceeded 12, TN removal rate has no obvious growing. Meanwhile, fluorescent in situ hybridization (FISH) analysis indicated that the biomass in the biofilm were much richer than which in the suspension, and the ammonia oxidizing bacteria have a easy access to be dominant bacterial community in lower C/N ratio.
Measurement of the Electric Initiating Device Temperature Using Infrared Microscopic Thermographer
Authors: Zhang Wen Chao , Wang Xiao Wei , Xu Bo , Zhang Dong Ping
Published: September 2012

The temperature of electric initiating device under constant current has the vital significance to the security and the firing performance of electrical explosive initiator. In this paper, the temperature of bridgewire and semiconductor bridge which were representative in electrical explosive devices (EED) was studied using the infrared microscopic thermographer. The curve of temperature with current change is obtained. The resluts indicate that the temperature increases with the current in the form of quadratic parabola and the temperature of semiconductor bridge rises slower than that of bridgewire. According to the experimental analysis, it is found the reason that the temperature of semiconductor bridge increases slower is attributed to the better heat conduction property due to the close-contact silicon between substrate and bonding pad.
Optimization of the Composite Cure Process Based on the Thermo-Kinetic Model
Authors: Shevtsov S. , Zhilyaev I. , Soloviev A. , Parinov I. , Dubrov V.
Published: September 2012

High performance composite structures produced by the processes at which the consolidation of the fibres and matrix is done at the same time as the component is shaped. Full curing schedule include a pre-warming for resin liquefaction, next apply of pressure to remove the gas bubbles, and finally consolidation of resin at elevated temperature to its full polymerization. The change in the state of the composite should be made as possible uniformly across the thick-walled products. The complexity of process control is due to unobservability of the rheological state of material in a closed volume of a mould. In this paper we propose a mathematical model of epoxy-based thick-walled composite structure curing. PDE system linking a kinetic equation of the resin cure with heat transfer equation, take into account a phase transition from liquid to gel and further to the solid state. On the basis of transient analysis of the developed model we optimize the temperature control law.
Preparation and Catalytic Activity Analysis of TiO2
Authors: Han Shi Yan , Liu Zhi Ming , Wang Di , Zhu Ming Hua , Ma Yan Li , Zao Yan Yan
Published: September 2012

Three kinds of TiO2 materials named Ti0, Ti0.5 and Ti1.0 were prepared via hydrothermal synthesis method using Tetrabutyl titanate (TNB) as the material and different amounts of Gemini Surfactant we prepared as the template. Then the prepared TiO2 nanoparticle was characterized by Scanning electron microscope(SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Taking the UV light as the light source ,the photocatalytic activity of TiO2 to rhB was studyed . The results showed that the degradation rate of Ti0, Ti0.5 ,Ti1.0 to RhB respectively was 93.6 % , 93.9 %, 99.7 % at the time of 3 hours. The catalytic activity of Ti0.5 and Ti1.0 was obviously better than Ti0, what’s more, Ti1.0 almost made RhB completely degradated at the time of 3 hours.
Investigation on the Simulation of SCR Chemical Reaction
Authors: Wang Wei , Xiao You Hong , Tian Xin Na
Published: September 2012

Abstract. With the global environment worsening and the consciousness of protecting environment strengthening, the limitation of noxious gas from diesel engines is becoming more and more strictly. Selective catalytic reduction (SCR) aftertreatment system has been applied to reduce Nitrogen Oxides (NOx) as a key technology. The urea solution injected into the tailpipe decomposes to ammonia, which will react with NOx on the surface of SCR catalyst. The main purpose of this paper is to study the effect of different concentrations of NO, NO2 and NH3 on the reactions taking place with SCR catalyst by simulation. Based on mass transfer equations and chemical kinetics the simulation results predict the concentrations of NO, NO2 and NH3 accurately. The mass conservation equations of species are solved by the software MATLAB. Some regulations can be revealed to improve the NOx conversion efficiency and reduced the NH3 slip.
Modelling of Electroelastic Behaviour of Embedded Piezoelectric Actuators in Smart Structures: 2D and 3D Effects
Authors: Zhao Bin , Wang Xiao Dong
Published: September 2012

A two-dimensional electroelastic model of embedded piezoelectric actuators was proposed to study the coupled electromechanical behaviour of a thin piezoceramic actuator embedded in an elastic host structure under applied stresses. Interfacial normal and shear stresses for both plane stress and plane strain deformations were calculated to evaluate the actuation effects transferred from the actuator to the host structure. Three dimensional analyses were also conducted using the finite element method to validate the present model by comparing the two results for specific examples. It was observed that the current model provided reasonable prediction of the load transfer by the actuator.
Effects of Various Parameters on the Coating of Substrates with Trenches
Authors: Mazloomi Ali , Moosavi Ali
Published: September 2012

We investigate thin liquid film coating of substrates with trenches via lattice Boltzmann method. The effects of different parameters such as the capillary number, the contact angles and geometric parameters on the results are studied. Our results indicate that for trench depths greater than a critical size coating of the trench is not successful. The critical depth increases by decreasing the capillary number. Moreover we find height, width, capillary number and contact angle under which the coating is successful. The results have been compared with the available results and very close agreement has been achieved.
Application of Acoustic Emission Technology in Material Detection
Authors: Zhang Chun Lei , Qiao Kun , Zhu Bo , Xie Ben , Lin Zhi Tao , Zhang Shi Lei , Huang Xiao Xiao , Zhong Fei
Published: September 2012

The principle of acoustic emission (AE) technology was introduced in this work, as well as the application and the achievements of AE in recent years, such as the utilization in unidirectional carbon fiber reinforced composite. References for in-depth research of material properties and failure mechanism were provided in this article.
Oil Depot Foam Fire Extinguishing System Design Research
Authors: Zhao Jun Hai , Zhang Hong Sheng
Published: September 2012

With reference to fire system design norm, the analysis of the traditional fixed foam extinguishing system principle of work, see the shortcomings. The foam fire pump and fire pump separate hydraulic driven equilibrium pressure foam mixer device system; a detailed analysis of the main composition and characteristics of the system, and the design of the notes.
Research on the Capacity Promotion of Chemical Logistics Based on the Material Resources
Authors: Chen Yong Ping
Published: September 2012

The material resources are the important contents of the development of the modern chemical logistics industry. The logistics is the component of the development of the chemical industry. Modern chemical industry has been developing very quickly. The rapid development of the chemical industry needs more support of many logistics resources for the capacity promotion of the logistics service capacity. The abundant logistics material resources could contribute to the promotion of the operation efficiency in the chemical industry. The aim is to contribute to the rapid development and the capacity promotion of the chemical industry for the purpose of the better economic benefits.
Effect of Ge Incorporation on Hydrogenated Amorphous Silicon Germanium Thin Films Prepared by Plasma Enhanced Chemical Vapor Deposition
Authors: Yan Bao Jun , Zhao Lei , Zhao Ben Ding , Chen Jing Wei , Diao Hong Wei , Wang Guang Hong , Wang Wen Jing
Published: September 2012

Hydrogenated amorphous silicon germanium thin films (a-SiGe:H) were prepared via plasma enhanced chemical vapor deposition (PECVD). By adjusting the flow rate of GeH4, a-SiGe:H thin films with narrow bandgap (Eg) were fabricated with high Ge incorporation. It was found that although narrow Eg was obtained, high Ge incorporation resulted in a great reduction of the thin film photosensitivity. This degradation was attributed to the increase of polysilane-(SiH2)n, which indicated a loose and disordered microstructure, in the films by systematically investigating the optical, optoelectronic and microstructure properties of the prepared a-SiGe:H thin films via transmission, photo/dark conductivity, Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) measurements. Such investigation provided a helpful guide for further preparing narrow Eg a-SiGe:H materials with good optoelectronic properties.
The Integration of Taguchi Method and FAHP Method to Improve the SMT Solder Paste Printing Thickness Processing Capability
Authors: Hung Tsung Hsin
Published: September 2012

In response to the trend of miniaturization of electronic components, SMT (Surface Mount Technology) technology is become increasingly important. According to statistics, more than 70% of SMT defects occur in the solder paste printing process; hence, provided the solder paste printing process is completed correctly, the SMT yield can be maintained at a certain level. The solder paste printing process is the core of SMT technology; inability to control the process parameters may easily lead to poor solder results, which reduce product quality and increases production costs. By integrating the Taguchi and FAHP (Fuzzy Analytic Hierarchy Process) methods, this study attempted to obtain the solder thickness Cpk optimal parameters and apply DOE (Design of Experiments) in experimentation to determine the optimum SMT solder thickness parameter combination for process engineers to rapidly implement and control the SMT solder thickness process according to the optimal SMT process parameters. The empirical results suggested that, the SMT solder printing thickness processing capability Cpk value has been improved from 0.58 to 1.47, which could improve the quality of relevant electronic products.
Preparation of Gradient ZTA Ceramic by Centrifugal Slip Casting Method
Authors: Wang Si Kun , Yu Jing Yuan , Li Qiang , Zheng Er Yong , Duan Yong Gang , Qi Guo Chao
Published: September 2012

Gradient Zirconia toughened alumina (ZTA) ceramics with high fracture strength and toughness were prepared using centrifugal slip casting method. Aqueous Al2O3-20vol% ZrO2 slurries with different solid contents were prepared and the rheological characteristic of the slurries were investigated. The effect of solid loading of slurries on green density difference of ZTA ceramic compacts was observed. Mass segregation of Al2O3 and ZrO2 particles were studied. Microstructure and bending property of the sintered ZTA ceramics were investigated. The results show that the segregation phenomenon of Al2O3-ZrO2 slurries comes form the difference of settling velocity of Al2O3 and ZrO2 particles. With the increase of solid content of slurries, the gradient distribution of green density becomes unconspicuous. After sintered at 1550○C for 2 h, the gradient ZTA ceramics centrifuged with 20vol% slurries have high sintered density (99.2% TD) and continuous gradient distribution of Al2O3 and ZrO2 particles. The fracture strength and toughness of gradient ZTA ceramic are 732MPa and 5.4MPam1/2, respectively.
A Novel Three-Dimensional Gait Analysis System
Authors: Liu Tao , Inoue Yoshio , Shibata Kyoko , Shiojima Kozou , Yin Ji Bin
Published: September 2012

Three-dimensional (3D) lower limb kinematic and kinetic analysis based on ambulatory measurements is introduced in this paper. We developed a wireless sensor system composed of a mobile force plate system, 3D motion sensor units and a wireless data logger. 3D motions of body segment and triaxial ground reaction force (GRF) could be simultaneously measured using the system, and the data obtained from sensor units on thighs, shanks and feet could be transferred to a personal computer by wireless local area network (LAN). An inverse dynamics method was adopted to calculate triaxial joint moments. The accuracy of kinematics and kinetics (joint moments) assessment is validated against results obtained from the stationary measurement system based on camera movement analysis and force plates.
Permanent Magnets Design and Magnetic Field Analysis of a Novel Permanent Magnet Linear Motor
Authors: Zhang Gong , Xie Zhan Gong , Chen Xian Shuai , Zhou Xue Feng
Published: September 2012

In order to improve the output force characteristics of permanent magnet linear motor (PMLM), studied from permanent magnets (PMs) structure that is the key component of PMLM, different magnetization methods of single PM and different array structures of multiple PMs are compared, and a novel PMLM magnetized alone the external field force lines using 8 pieces tegular Halbach magnet array with air gaps is proposed as well. The analysis on magnetic field of PMLM shows that the force between the coil and the single PM increases by more than 40%, and the average magnetic induction in coil centre generated by the 8 pieces Halbach magnet array arrives at the maximum value, 10% higher than that of 1 piece structure.
A Multi-Dimensional Coupled Electro-Thermal Model of a LFP Battery
Authors: Cen Hong Zhang , Wei Xue Zhe , Dai Hai Feng , Song Li
Published: September 2012

In this article a multi-dimensional coupled electro-thermal model of a LFP battery is proposed. The model includes a 1-d model based on porous-electrode theory and a 3-d battery model solving the temperature distribution of the battery. These models are coupled through heat generation rate during discharging process. Moreover, an experiment is designed to check the inside temperature information of the battery.
Energy-Saving Rare Earth Lifting Permanent Magnet
Authors: Ding Ning , Zhang Ding Tong
Published: September 2012

At present, the lifting electromagnet is widely used in almost all the countries in the world. But it has some fatal disadvantages related to the electrical power input that it requires among other things. To eliminate these disadvantages, a Rare Earth lifting permanent magnet was designed. This paper introduces the magnetic circuit design of lifting permanent magnet. At the same time, a perfect self-acting driving system has been invented, which guarantees that the attracted cargoes can be lifted or unloaded fast and conveniently without using any electricity at all.