bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation SiC Ceramic Composite Filtration Membrane Materials by Dry Pressing and Synchronous Sintering Method
Authors: Su Kui Fan , Wang Li Ming , Deng Xiang Yun , Li Jian Bao , Wang Chun Peng , Zhang Guo Qing , Jing Ya Ni , Bai Cheng Ying
Published: May 2013

Silicon carbide ceramic composite filter membrane materials were prepared by dry pressure molding and synchronous sintering process at sintering temperature of 1300oC for 3h. and research the influence of on the molding pressure structure of SiC filtration membrane,effect of particle size on porosity, average pore size and filter pressure drop of filtration membrane, SEM was performed to examine the morphology, The porosity ,average pore size and filter pressure drop of filtration membrane were tested by Archimedes method ,bubble point method and filter pressure drop instrument. It is demonstrated that while the molding pressure (F) varied from 1MPa to 10MPa, the filter membrane material achieved preferable morphology and best performance when F equals to 5MPa. Under this modeling pressure, while silicon carbide particle size increased from 1 to 23μm, the pore ratio decreased from 48.0% to 36.2% and the average pore size increased from 0.35μm to 9.4μm, while the air gas velocity changed from 0 to 0.112m/s, the filter pressure drop increased, when the velocity is stable, the filter pressure drop reduced as the silicon carbide particle size.
The Research Progress of Nitinol Vascular Stent
Authors: Ma Jia Li , Zhu Ming , Miao Wei Dong , Li Jun Tao , Kou Ya Ming
Published: May 2013

Nitinol alloy is used widely in biomedical science because of their good performances. The radial support force, biocompatibility and fatigue performance of nitinol alloy blood stent meet the requirement correctly. With the development of computer simulation technology, the stent structure, materials and so on will get further improvement and innovation under the help of statuses on the finite element analysis and blood flow dynamics simulation of nitinol alloy stent.
Study on Microstructures and Mechanical Properties of Die Casting Mg-xGd-3Y-0.5Zr Alloys
Authors: Wang Feng , Wang Zhi , Liu Zheng , Mao Ping Li
Published: May 2013

In this paper, developed a non-aluminum die casting magnesium alloys were studied based on Mg-xGd-Y-Zr（x=6, 8, 12 wt.%）alloys in cold chamber press. The microstructures and mechanical properties of die casting GWK alloys have been investigated using OM, SEM, XRD, EDS and mechanical property test. The experimental results show that with increasing Gd content of Mg-xGd-Y-Zr alloys, the tensile strength increase, but elongation decrease. In particular, die casting GWK alloys after short-term and low-temperature solid solution treatment (T4) have a small variation in grain size and more uniform microstructures, and the second phases distribute at the grain boundaries in form of discontinuous rod shape or granule shape, which result in an obvious improvement in tensile mechanical properties of alloys. The Mg-12Gd-3Y-0.5Zr die casting alloy exhibit maximum tensile strength after solution heat treatment, and the value is 269MPa at room temperature. The effect of solution heat treatment on die casting Mg-xGd-Y-Zr alloys was also discussed.
Enhanced Field Emission from Carbon Nanotubes Coated by Nanoparticles of Turbostratic Stacked Graphenes
Authors: Li Qin Tao , Hu Rong , Zhao Xian Rui , Li Zhi Gang , Liu Yan Ping
Published: May 2013

The field emission (FE) of the carbon nanotubes (CNTs) modified by hydrocarbon ion treatment with an energy of 80 eV has been demonstrated. Compared with untreated CNTs, the turn-on field and the threshold field of the modified CNTs decreased significantly. Scanning electron microscopy and transmission electron microscopy indicate that, after hydrocarbon ion treatment, the CNTs are coated by amorphous carbon layer at 300°C of substrate temperature and nanoparticles of graphene stacks at 700°C. It is considered that both amorphous carbon and stacked graphene coating layer can decrease the effective surface work function of CNTs and thus increase FE.
Preparation of Aluminum Nanoparticles and Oxidation Mechanism of Nano- and Micro-Particles
Authors: Chen Liang , Liu Lei , Li Zhen , Xiao Cheng Jing , Wei Tao
Published: May 2013

Aluminum nanoparticles were prepared by laser and inducting heating methods, then the phase, structure and thermal properties of them were characterized by X-ray diffraction, electron microscope and simultaneous thermal analyzer, respectively. The results showed that there was great difference between micro- and nanoparticles in oxidation behavior. Aluminum micron particles had a very strong endothermic peak at the temperature of about 660°C and the absorption heat enthalpy is 328J/g.The release heat enthalpies of aluminum nanoparticles oxidized by oxygen are 4.219 kJ/g and 3.584 kJ/g. Because of the size decreases to nano-size, the aluminum nanoparticles can be oxidized directly by oxygen and release a large amount of heat, which is beneficial to the propellants when it been burn. However, the micro-particles should absorb heat which other components released, and release heat slowly after melted, which are not as good as the nano-ones.
The Preparation and Properties of Porous Scaffold Made of Nano-Hydroxyapatite/Polyamide66
Authors: He Yun , Lan Hong , Liu Juan , Guo Ling
Published: May 2013

In this study, we prepared porous nano-hydroxyapatite/ polyamide 66 (n-HA/ PA66) porous scaffolds by injection molding method. The morphology, macrostructure and mechanical strength of the scaffolds were characterized. Osteoblasts (OBs) derived from cranial bone of SD rats were cultured and seeded on n-HA/ PA66 scaffolds. The OB/scaffold constructs were cultured for up to 18 days and the adhesion, proliferation and osteogenic activity of OBs were observed by scanning electron microscope and detected by alkaline phosphatase activity. The results showed that the porous n-HA/PA66 porous scaffolds are biocompatible and have no negative effects on the OBs in vitro. The scaffolds fulfill the basic requirements of bone tissue engineering scaffold, and have the potential application in orthopedic, reconstructive and maxillofacial surgery areas.
Thin Film Microcircuit Preparation in a Diamond Anvil Cell
Authors: Wang Jia , Wu Bao Jia
Published: May 2013

An effective and convenient method about molybdenum metal thin film microcircuit was developed on diamond anvil cell(DAC) under high pressure. Alumina film was used as the protective layer and sputtered on DAC. By using this method, we studied the electrical resistance variation about nanoparticles ZnS power up to 36GPa. The reversible phase transition had been reflected clearly by the electrical resistance measurements with sample.
A Novel 5-Fluorouracil-Loaded Polyelectrolyte Nanoparticle Formulation
Authors: Fan Yu Ling , Fan Bing Yu , Li Qiang , Leng Shuang , Ma Li Hua
Published: May 2013

To successfully prepare drug delivery system, nanoparticles (NPs) with simple and effective method avoiding use of potentially toxic solvent and components, 5-fluorouracil (5-Fu) was chosen as a model low molecular weight chemotherapeutic drug and 5-Fu- loaded NPs were prepared with the lecithin emulsified method following the alginate solidification and chitosan aggregation. Prescription was optimized by orthogonal experiment. The resultant 5-Fu NPs had a spherical structure with a diameter about 200 nm. The encapsulation efficiency of 5-Fu NPs is 55.36 ± 1.10%. The loading capacity is 4.22 ± 0.14%.
Emission Color Variation of Sr3SiO5:Ce3+, Li+ Phosphor for Near-UV Light-Emitting Diodes by Co-Doping with Mg2+ and Ba2+
Authors: Zhu Ping Ping , Huang Tong Wen , Wang Xiao Jun , Li Hui Li , Sun Zhuo
Published: May 2013

This paper reports the spectral variation of Sr3SiO5: Ce3+, Li+ phosphor. It was synthesized by the conventional solid state method. The effects of calcining temperature and codoption of Mg2+ and Ba2+ on phase composition, structure, photoluminescence and thermal stability were firstly investigated in detail. Under the near-UV excitation of 415 nm, Sr3SiO5: Ce3+, Li+ emits a bright greenish-yellow color centered at 532nm, which originates from 5d to 4f (2F7/2 and 2F5/2) transition of Ce3+. The PL spectra show the different emission color variation with substituting Sr2+ cations with smaller Mg2+ or larger Ba2+, which makes it be applied as a color-tunable phosphor for LED based on near-UV chip/phosphor technology. Simultaneously, the thermal stability of (Sr,Ba)3SiO5: Ce3+, Li+ phosphor is improved markedly.
Influence of Deposition Temperature of ZnTe Films on Silicon by Thermal Evaporation
Authors: Lin Jenn Sen , Wei Shih Syun , Yu Yi Ting , Hsu Cheng Hsing , Kao Wen Hua , Chen Wen Shiush , Tseng Ching Fang , Lai Chun Hung , Lu Jian Ming , Ju Shin Pon
Published: May 2013

The microstructure and electrical properties of ZnTe films were investigated by using thermal evaporation with emphasis on the effects of a deposition temperature. Microstructure, crystallinity, carrier concentration, resistivity, and mobility are shown to be dependent on the deposition temperature. The highest carrier concentration of 9.1×1014 cm-3, the lowest resistivity of 9.9 Ω-cm and the largest mobility of 667 cm2V-1S-1 are presented at a deposition temperature of 580oC, respectively. The ZnTe thin films using thermal evaporation can find applications in solar cell or light emitting diodes.
Casted Strip Character of Twin-Roll Casted High Strength Non-Oriented Electrical Steel
Authors: Wang Yu Qian , Zhang Xiao Ming , Zhang Ting , Fan Zhong Mian
Published: May 2013

A twin-roll casting process was used to produce high strength non-oriented electrical steel casted strips. The typical character in chemical composition is the adding of Ni and Cr.The main role of Ni and Cr is solution strengthening. MEM, SEM, and TEM were used to observe microstructure, texture, and precipitate characteristics of a casted strip. The casted strip character under different secondary cooling process was compared. The results show that water-cooled as-cast strip is composed of the equiaxed grains, air-cooled as-cast strip is characterized by a mixture of the quiaxed and columnar grains. The texture of water-cooled as-cast strip is weaker and diffuser than air-cooled as-cast strip. Precipitates mostly are AlN and MnS, which mostly precipitate in the grain. The precipitates of Ni and Cr is not observed. The size distinction of MnS between two secondary cooling process is not remarkable. The size of AlN in water-cooled process is smaller than in air-cooled process.
Magnetic Material Based on Full-Heusler Alloy Co2CrGa
Authors: Han Hong Pei
Published: May 2013

By means of the full potential linearized augmented plane-wave method based on the first-principle study, we calculate the structure, electronic and magnetic properties of full-Heusler alloy Co2CrGa. Our results show that full-Heusler alloy Co2CrGa is ferromagnetic ground state with a magnetic moment of 3.03774μBper formula unit. Importantly, the calculated spin polarization around the Fermi level is very high up to 93.2%, which indicates that full-Heusler alloy Co2CrGa would be possibly applied to the field of the material engineering and spintronic devices.
Study of Optical Characteristics of H2S Molecule Adsorption on Agn (n=3,5) Clusters
Authors: Zhou Hong , Wen Jun Qing , Wang Jun Feng , Wang Jun Fei
Published: May 2013

All electronic structures and infrared adsorption spectra of AgnH2S (n=3, 5) clusters have been performed by using density functional theory. We obtain the lowest-energy structures of Ag3, Ag5, Ag3H2S and Ag5H2S clusters. The calculation results show that the lowest-energy structures of Ag3 and Ag5 clusters are planar geometries. The lowest-energy structures of Ag3H2S and Ag5H2S can be obtained by adsorbs immediately H2S on Ag3 and Ag5 clusters. The peak of infrared spectrum is 120cm-1 for Ag3 cluster, which is smaller than that of Ag5 cluster (180 cm-1). The peak of infrared spectrum is 350cm-1 for Ag3H2S cluster, which is larger than that of Ag5H2S cluster (290 cm-1). The comparison illustrates that adsorption H2S molecule make the peak of infrared spectrum shifting to shortwave.
Investigation on the Creep property of Theoretical Composition Magnesia Alumina Spinel Bricks
Authors: Hong Shan Shan , Li Yong
Published: May 2013

Using alumina-rich MgAl2O4 spinel AR78 and 97 fused magnesite as raw materials, brine as the binder, magnesia alumina spinel bricks close to theoretical composition have been prepared. Then the high temperature creep experiments are carried on. The creep property is analyzed by microstructure and creep curve. The results show that: (1) The magnesia alumina spinel bricks close to theoretical composition prepared have well sintering performance and compact structure.(2) The specimen 1# has the best creep property, of which the final creep rate was -1.45% after creep experiment for 50h. (3) Under high temperature and pressure for a long time in creep experiment, the internal of spinel is further sintered, the pores of the specimens are rearranged.
Built-In Spiral Ripe Thin-Walled Square Steel Tube Concrete Column of Nonlinear Finite Element Analysis
Authors: Wang Li Sha , Li Bai Shou
Published: May 2013

For the problem of square concrete-filled steel tube (CFST) under the action of axial pressure, concrete received local compression and buckling occurred in the application of thin-walled steel pipe.Using built-in spiral reinforcement to strengthen the constraints of thin-walled square steel tube to core concrete. And by using ANSYS program established the built-in spiral reinforcement of thin-walled square steel tube concrete composite column 3 d finite element model, and the results show that spiral reinforcement strengthen the constraint effect, increase the ultimate bearing capacity of the composite columns of square steel tube by 7.41%; And with stiffening rib and rod measures were compared, built-in spiral ripe construction is convenient, easily applied.
Preparative Techniques and its Performance of Chemically Foamed Cement Paste
Authors: Ma Xin Wei , Li Xue Ying
Published: May 2013

The foamed cement paste (FCP) is a kind of inorganic insulation material. It is characterized by its light weight, heat-insulating and fire-proofing properties, and the thermal conductivity is close to that of expanded polystyrene (EPS). The foamed cement paste is achieved by means of chemical reaction. The mixture proportion, the preparation process, mechanical and thermal properties are investigated in this paper. The results show that properly mixed paste foams stably, and the bulk density could be controlled. The hardened FCP could be used as insulating filler material in composite walls, as well as blocks for Thermal insulation walls.
Short- and Long-Term Deflection of Concrete Structures
Authors: Zhang Lei , Tian Jin
Published: May 2013

The general concepts of two basic forms of deflection are summarized and the existing calculation theories of deflection are introduced; two cases of concrete structure deflection, which are short-and long-term deflection, are discussed through comparison. Further, the basic theories of deflection calculation and deflection control methods are indicated based on two different cases in this paper.
Stability Bearing Capacity of Concrete Filled Thin-Walled Circular Steel Tubular Column under Axial Compression
Authors: Zhang Xue Peng
Published: May 2013

The bearing capacity formula of concrete filled thin-walled steel tubular (CFTST) short column was established based on limit equilibrium method, and the reasonable value fork1in Richart Strength Model was regression introduced adapted with concrete stress-strain relations. According to the elasticity modulus theory, the calculation formulas of stability bearing capacity of CFTST slender column were deduced, reasonable considering the interactions between steel tube and concrete. And the calculation process is relatively simple which avoiding complicated iterations used in the conventional calculation method. Finally, the comparative evaluation on calculation formula was done based on 79 groups of test results of concrete filled steel tubular column at home and abroad. Results of calculation formula agree well with the test results in safe range.
Study on Clinker Production Using Magnesium Slag on a 4500tpd Line
Authors: Lu Feng , Bai Rui Ying , Cai Ji Wei
Published: May 2013

Magnesium slag was used to produce cement clinker replacing part of limestone and sandstone with 11% content. The results show that the magnesium slag can significantly improve the grindability and burnability of Portland cement raw materials. The 28d compressive strength of this clinker is 58.9MPa and the physical performance can satisfied the requirements of 52.5 strength grade according to GB 175-2007.
Test of Dynamic Strength Characteristics of Paleosol
Authors: Wang Nian Qin , Liu Xiao Ling , Xue Yao Qiong , Jiao Xu Peng
Published: May 2013

Paleosol is an important factor affecting the stability of loess slope, and its mechanical properties, deformation and failure mechanism are still under in-depth exploration and research. Here based on the GDS Lab System, using equivalent sine wave progressively loading mode of strain controlling, in order to reveal the dynamic strength characteristics of Paleosol under the vibration effect. The result show that:① there is an obvious phenomenon of stress relaxation during the cyclic loading test on Paleosol; Paleosol is high-consolidated clay, when the given confining pressure less than the natural confining pressure, the degree of stress relaxation increased at first and then decreased,to the contrary first decreased and then increased.② under the 50kPa、80kPa、100kPa confining pressure, the dynamic failure stress of Paleosol is 0.176kN、0.2302kN、0.2555kN,the dynamic failure stress increases linearly with the increase of confining pressure. The correlation coefficient is 0.9009 and the linear regression equation is бd=0.001б3+0.0958.③ On the basis of Molar Coulomb failure criterion, We obtained the index of dynamic strength of Paleosol, which was C=25.63kPa and φ=14º, by Molar Circle. In comparison with the static strength, the internal friction angle and cohesion decreases significantly, show that the Paleosol have obvious characteristic of brittle.
The Inhibition Studying of Single-Doped Mineral Admixture for Concrete Alkali Silicate Reaction
Authors: Zhu Xun Guo , Chen Gen Sheng
Published: May 2013

The research uses Mortar bar rapid method. The experiment of single-doped mineral admixture such as fly, slag and silica fume has been done on the base of the theory of mineral admixture suppressing concrete alkali silica reaction (ASR).The effect of each mineral admixture on suppressing concrete ASR has been analysis ed. It shows that the inhibition for suppressing concrete ASR was the most beneficial when the addition of fly is 50% and the more the dosage is, the better the inhibition is. The silica fume is more beneficial for suppressing concrete ASR relatively and it also needs less addition. The effect of slag is the poorest and it also needs more addition.
Method and Trend of Residential Landscape Design
Authors: Guo Hong Yu , Cai Yun Nan
Published: May 2013

The article expounds some kernel methods of residential landscape design through three aspects: themes, order of scenes and organization of landscape elements, and discuss future trend and characteristics of residential landscape design according to development stage of city and innovations on landscape concepts.
Research on Spacial Displacement Regulations in Soft Surrounding Rock Tunnel
Authors: Lin Bao Long
Published: May 2013

Based on the engineering background of Dongkeling tunnel of Guizhou-Guangzhou high-speed rail, construction process in soft surrounding rock is simulated by using finite difference software——FLAC according to large-deformation characteristics in water-rich and weathering altered granite weak surrounding rock. Several aspects, such as vault settlement, invert uplift, clearance convergence, surface settlement, the maximum and minimum principal stress of the initial support and plastic zone of surrounding rock, are analyzed to determine the tunnel stability with different construction methods.
Thermal Conductivity of Fired Clay Bricks Incorporated with Cigarette Butts
Authors: Sarani Noor Amira , binti Abdul Kadir Aeslina
Published: May 2013

Billions of cigarette butts (CBs) were discarded by smokers directly into the environment. It is known that CBs are one of the environmental pollution that could caused contamination on the street, sidewalks, waterways, beaches and public areas. Due to its small size but large in volume, CBs cannot be collected easily and most of it will be disposed directly to the landfill. Moreover, there is no easy mechanism to ensure the separation of the chemicals trap inside the CBs which is toxic to the environment. Therefore, by incorporating CBs into brick bodies will be an alternative solution to CBs littering and pollution problems. In this study, different percentages of CBs (0%, 2.5% and 5.0%) were incorporated into fired clay brick. Different heating rates were applied during firing stage which are 1oC/min, 3oC/min and 5oC/min respectively. All samples were fired at 1050oC. Thermal conductivity for cigarette butt brick (CB Brick) were tested using Hot Guarded Plate Method. From the results obtained, it could be concluded that; with higher percentages of CBs, the thermal conductivity properties were also improved which is desired but most of the brick manufacturers. CBs incorporated could be an alternative pore formers to improve the thermal properties of fired clay brick. At the same time, the porosity is also increased thus the density was significantly reduced to become lightweight brick.
The Evaluation System of Urban Low-Carbon Level
Authors: Ma Yan Ting , Ma Chun Jie
Published: May 2013

Since the country put forward the construction of low carbon city, government and citizens begin to make energy saving, environmental protection, and low carbon consciousness into their daily life. Construct the overall evaluation system of urban low-carbon level helps accurate understanding and quantifying citys low-carbon level, thus promotes its construction and development. Based on the analysis of the connotation of low carbon city, this paper selects indicators from six aspects, which are low-carbon economy, low-carbon construction, low-carbon traffic, low-carbon life, low-carbon environment and low-carbon society, to construct the evaluation system of urban low-carbon level, and assess whether the city had done a good job on low carbon development.
Effect of Sodium-Based Slag Treatment on the Distribution of Impurities in Metallurgical Grade Silicon
Authors: Fang Ming , Lu Cheng Hao , Lai Hui Xian , Huang Liu Qing , Chen Juan , Li Jin Tang , Ma Wen Hui , Wei K.X. , Sheng Zhi Lin , Shen Jian Ning , Luo Xue Tao
Published: May 2013

The distribution of impurities in metallurgical grade silicon before and after slag treatment was investigated for the purpose of upgrading metallurgical grade to solar grade silicon. It was found that metal impurities co-deposited with silicon and formed different intermetallics in the precipitated phase, and these intermetallics such as Si-Fe, Si-Ni, Si-Ti-V and Si-Ca-Al-Fe were substituted by Si-Fe-Ti-V after treatment of Na2CO3-SiO2 slag. Non-metallic impurities B and P were nearly homogeneous distribution in metallurgical grade silicon before and after slag treatment. Moreover, a particular analysis of the microstructure of slag has been carried out, it was determined that metal impurities Al and Ca could easily migrate from silicon to slag phase in the refining process.
Maximized On-Demand Hydrogen Generator Design
Authors: Chao Chung Hsing , Jen Tien Chien
Published: May 2013

In this paper, magnesium hydride was used to react with water using a new design of control strategy to produce maximized on-demand hydrogen generation from the hydrolysis reaction. Magnesium hydride is the chemical compound MgH2, which contains 7.66% by weight of hydrogen and as a potential hydrogen source. Although the concept of reacting chemical hydride with water to produce hydrogen is not new, there have been a number of recent published papers which might be employed as on site generation of hydrogen for fuel cell applications. Under room temperature, the hydrolytic reaction between magnesium hydride and water to form a thin-layer of magnesium hydroxide on the outer surface impedes water from coming into direct contact with the magnesium hydride. The key to continual removal of this coherent magnesium hydroxide layer can induce the reaction of magnesium hydride with water near room temperature by the addition of citric acids. These additions act to disrupt the magnesium hydroxide layer on the magnesium hydride. This concept of using the magnesium hydride reaction with water to produce hydrogen has the following conclusions. This study presents a maximized on-demand hydrogen gas generator capable of producing hydrogen at an almost-constant H2 rate, which using this approach can reach the 6.4% by weight of hydrogen. In addition, based on the kinetics of magnesium hydride-water reaction, it does not need any noble-metals catalysts to meet the minimum hydrogen flow rate for fuel cell power systems. Finally, the cost of producing hydrogen from magnesium hydride-water approach would cost approximately $15 per kg hydrogen.
Purification of Silicon by Solvent Refining with Si-Sn Alloy
Authors: Lu Cheng Hao , Fang Ming , Lai Hui Xian , Huang Liu Qing , Chen Juan , Li Jin Tang , Sheng Z.L. , Shen J.N. , Luo X.T.
Published: May 2013

Silicon was purified by solvent refining with Si-Sn binary alloy system. Two descend mold velocities, 10mm/h and 100mm/h were tested in directional solidification of the alloy melt. The morphology, structure and the ingredient of the ingots have been investigated by SEM, XRD, EPMA, GDMS and ICP-MS. The contents of Fe, N, C , Ca, Mn, Cu, P and B are significantly lower than that in raw silicon. Furthermore, the acid leaching experiments were introduced to remove tin from silicon. The temperature of acid leaching and the type of acids were the predominant conditions in tin separation from silicon by acid leaching.
Summarize the Studies on Improving the Electrochemical Performance of Spinel LiMn2O4
Authors: Wang Fu Li , Xue Hong Dan , Wang Ke , Liu Pu , Bai Yong Qing
Published: May 2013

Many studies show spinel LiMn2O4 is one of the most promising cathode materials for lithium ion batteries. At present, urgent need is that capacity attenuation in the process of charge / discharge and cycle stability at high temperature are developed. The methods can be classified into bulk doped, surface coated and nanometer particles. Research progress about improving the electrochemical performance of spinel LiMn2O4 is summarized and further research trend is pointed out in this paper.
Mathematical Modeling of a DMFC Cathode with a Double Catalyst Layered Structure Membrane Electrode Assemblies
Authors: Suo Chun Guang , Zhang Wen Bin , Wang Da Da
Published: May 2013

Membrane electrode assemblies (MEA) is the key component of a direct methanol fuel cell (DMFC) and its structure and fabrication technology influenced the performance of DMFC a lot. A novel structured MEA including a hydrophilic inner thin catalyst layer and a traditional outer catalyst layer, provide higher performance. To optimize the combination of the two catalysts layer a mathematical model based on Tafel type kinetics and semi-empirical mass transport coefficient was applied. The simulation of cathode overpotential results showed a DMFC with a 5μm thick inner Pt Blk catalyst layer and an 8μm thick outer 40wt%Pt/C catalyst layer as cathode electrode was the best.
Millimeter Wave Radar for Automotive Blind Spot Detection System
Authors: Li Shou Xiao , Cao Yun Xia , Bi Xin
Published: May 2013

Considering the problem of rearview mirror blind spot during driving, the paper studied and designed the blind spot detection system based on MMW radar. Radar was installed at an appropriate position on the detection target signal by transmitting, when another car enter the detecting area, the small alarm light beside A pillar would shine or alarm few times, to remind drivers careful change road. And the effect would not effect by weather or time. For the radar sensor application environment, triangle wave LFMCW can effectively solve the speed from the coupling phenomenon. The paper showed experimental and simulation data.
MSAHRS Online Calibration Method Aided by Star Sensors
Authors: Zheng Zhen Yu , Gao Yan Bin , He Kun Peng
Published: May 2013

In order to maintain the stability of precision of marine SAHRS, calibration should be made periodically. The paper proposed an online calibration method aided by star sensor.with the reference frame of boat frame on the beginning of calibration. By using the inertial attitude provided by star sensor as the attitude reference, the gyroscope constant drift can be estimated and attenuated. The difference of the integral of special force and projection of gravity on inertial space taken as the measurements,the zero bias of accelerometer can be calibrated.The method need not the disassembly of system,which is well suitble for online calibration.The computer simulation verify that the method can identify all the constant errors of SAHRS online not only in moorage but also on rocking base.
Sensor Noise Compensation for a Remote Controlled Sprayer Using EKF
Authors: An Juh Yun , Lee In Nam , Kim Ki Ho , You Kwan Ho
Published: May 2013

The dynamic model of a remote controlled sprayer using skid-steering method is presented as a state equation. The precision tracking of the remote controlled sprayer is difficult to realize due to sensor noise. In this paper, we propose the extended Kalman filter (EKF) algorithm to compensate for the odometric sensor noise. To demonstrate the performance of the proposed algorithm, simulations which represent a real working sprayer in a greenhouse are performed. The results show the improved localization accuracy obtained by using the proposed algorithm.
Model and Dynamics Analysis of a New Oscillator under Gravity
Authors: Liang Lin , Guo Tao , Su Shi Qi , Bai Bing
Published: May 2013

A mathematical modal for a new oscillator under Gravity is gived by The Second Law of Neton and proved the correctness by The Energy Method .We obtained a equation for the equilibrium point of system by the definition .We observe the dynamics action by the Hamilton function.Meanwhile the phase trajectories and the Poincaré sections are also presented. The analysis shows the complicated nonlinear dynamics with periodic motion in some special case.
Node Location Model and Simulations in Matlab for Wireless Sensor Networks
Authors: Liu Fang Wei , Shan Zhi Long
Published: May 2013

The locations of sensor nodes are essential to Wireless Sensor Networks applications. Researchers have proposed many localization algorithms for Wireless Sensor Network and verified them through simulators. In this paper, a system-level node location model that aims to validate proposed algorithms for wireless sensor networks in Matlab environment is proposed. This model can reflect the reality networks effectively. Using this model, researchers can verify the performance of the localization algorithms including run time, location error, and location node numbers.
Parameter Optimization Design and Stress Analysis of ANSYS in Inclined Gear Transmission System of Wind-Turbine
Authors: Yang Zhi Bang , Zhu Yue Feng , Chen De Lin
Published: May 2013

ncreasing speed Gear-box is one of the most important components of wind-turbine. Gear design directly affect the operating life and reliability of gear-box. Based on the 1.5MW wind-turbine as the research object in this paper, we optimized the design parameters of Inclined gears, analysed its bending stress reliability, further verified the gear maximum stress and stress position, to provide a scientific reference for making Inclined gears later.
Dynamic Mechanical System Analysis-Empirical Research of Wooden Window Enterprise
Authors: Zhao Jie , Xu Xin , Ding Yun Long
Published: May 2013

Competitive advantage is influenced by dual mechanical system: endogenous system and exogenous competitive system. Compared with uncontrollable exogenous competitive elements, endogenous competitive elements exerting structural competitive advantage is of vital importance for companies to battle against disadvantages and achieve competitive advantaged independently. Endogenous competitive elements comprise: firm culture, dynamic capabilities, and complementary assets. At the strategic level, firm culture influences firm decisions; at the organizational level, dynamic capabilities create core competence of a corporation; at the practice level, complementary assets erect barriers to competitors. This study empirically analyzed Firm Sayyas, a leading firm in wooden windows industry having encountered countless structural changes of competitive elements, to uncover how SMEs can achieve competitive advantage. The empirical analysis shows that, cultivating endogenous competitive elements based on “firm culture, dynamic capabilities, and complementary assets” in the dynamic competition is an effective way to maintain SMEs’ competitive advantages.
By Using SOM Network Visualization Methods for Diesel Engine Fault Diagnosis
Authors: Wang Guang Hui , Ren Qiu Ping
Published: May 2013

SOM neural network is of strong non-linearity mapping capacity and flexible network structure. Use this algorithm for training, form a scientific and rational classification of training samples, which draw the corresponding cause of the malfunction. Use a diesel engine system fault diagnosis model is established and the related parameters as the training sample, SOM network input layer neuron number parameter dimension 8, competition with 10 ×10 layer structure to establish the diagnosis model, through the simulation test, verify the validity and practicability of SOM neural network in fault diagnosis
Design of Wind Turbine Vibration Monitoring System
Authors: Wang Shou Bin , Gong Wei
Published: May 2013

In order to ensure safety of wind turbine operation and to reduce the occurrence of faults as well as to improve the reliability of wind turbine operation, a vibration monitoring for wind turbine is developed. In this paper, it analyses the enlargement of all the parts of the structure and the working mechanism, the research method of wind turbine operation vibration is introduced, with the focus being the use of the sensor principle. Finally the hardware design and software of this system is introduced and the main function of this system is described, which realizes condition monitoring of the work state of wind turbines.
Intelligent Gear Fault Identification Method Based on Harmonic Wavelet Package Energy Distribution and Grey Incidence
Authors: Zhang Wen Bin , Su Yan Ping , Zhou Yan Jie , Pu Ya Song
Published: May 2013

In this paper, a novel intelligent method to identify gear fault pattern was approached based on morphological filter, harmonic wavelet package and grey incidence. At first, the line structure element was selected for morphological filter to denoise the original signal. Secondly, different gear fault signals were decomposed into eight frequency bands by harmonic wavelet package in three levels; and energy distribution of each band was calculated. Finally, these energy distributions could serve as the feature vectors, the grey incidence of different gear vibration signals was calculated to identify the fault pattern and condition. Practical results show that this method can be used in gear fault diagnosis effectively.
A Study on Detection of Biased Gait by Using Acceleration Signal
Authors: So Ha Ju , Oh Han Yeong , Kim Seong Hyun , Kim Dong Wook
Published: May 2013

This study was performed in order to detect biased gait being occurred due to vestibular abnormality by using a data of acceleration being generated at foot during gait. Characteristics of acceleration being generated during gait was observed by comparing movement analysis data that was collected in a process of performing biased gait and general gait through induction of galvanic vestibular stimulation with acceleration data and biased direction and degree could be inferred through cumulative value of acceleration data by integrating it. As a result, it could be inferred that detecting gait bias after analyzing gait trajectory by using acceleration of left, right direction would be a feasible method. A significance of this study could be found in that a new possibility of utilizing acceleration was presented in an analysis of gait utilizing acceleration data. It is expected that the result of this study would be utilized for detecting abnormal gait that may be taken place by malfunction or damage of sensory receptor such as vestibular organ.
Defect Identification and Classification for Plasma Display Panels
Authors: Cho Du Hyung , Lee Seok Lyong
Published: May 2013

The defect inspection is a crucial process for the plasma display panel (PDP) production that significantly influences the quality of final products. In this paper, we propose a defect identification and classification method that extracts and classifies defects using various image analysis techniques. First, we identify defects through binarization of images using Gaussian filter. Then, those defects are classified into seven different types by analyzing geometric characteristics of defects and utilizing a support vector machine (SVM) classifier. The experimental results using separate sets of training and test PDP images obtained from production lines are quite promising. Our method identifies defects effectively enough to be used in the real environment. It also achieves a high correctness in classifying various types of defects.
Design of Test System for X Aero-Engine Synthesis Adjuster
Authors: Zhou Yi Lin , Zhang Tong Hua , Gong Bin
Published: May 2013

Based on the use of exiting testing equipment research, summarize the request of detection and analyze the existing problems. According to the signal characteristics of the aero-engine synthesis adjuster, designed a kind of test system based on virtual instrument for it, and developed a software system used for the adjuster in situ detection and offline testing. National Instruments launched Compact RIO platform. Adopted this platform as hardware system can realize test system open and integration designed very well, and simulated sensors for the offline test part of the system. This test system realized parameters calibrating, channel testing and fault diagnosis function etc. for the adjuster.
Research on Ferroresonance Detection in Small Current Neutral Grounding System
Authors: Zhang Qing Chao , Jia Xin Hua , Jia Peng , Wei Chao
Published: May 2013

A novel method to detect ferroresonance was proposed based on the drastic characteristics of the electromagnetic voltage transformer (PT) current rate. This scheme takes current rate which is greater than a threshold value as starting signal and judges the occurrence of resonance by detecting duty ratio of the peaks and interval angles. Then, it identifies the periods and patterns established on the interval time of spikes. Through simulation testing of MATLAB, it can distinguish the occurrence and types of ferroresonance accurately, which verifies the validity of the detection method.
Study on Dependability and Repeatability of Measurement Method of Mean Linear Thermal Expansion Coefficients of Glasses
Authors: Tian Ying Liang , Cui Zhu , Yuan Chun Mei , Liang Xin Hui , Sun Shi Bing , Fan Ji Ye
Published: May 2013

Coefficient of mean linear thermal expansion is an important physical property of glasses. It is the key thermodynamic property to evaluate the thermal stability and matching sealing of glasses. The measurement results of coefficient of mean linear thermal expansion obtained by different dilatometers showed that glass expands slowly with nonlinearity below 50 °C. It suggested that the initial temperature of measurement would be set above 50 °C, as behaves better repeatability and reliability of measurement than 20 °C as standard method set.
Design and Research on the Clutch Mechanism in Modern Offset Printing Machine
Authors: Wang Fang , Chen Hong
Published: May 2013

The clutch mechanism is the important part of printing machine. At present, cam connecting rod type mechanical clutch mechanism has been used by most of the domestic offset printing machine and its mechanical structure is very complex and its reliability is very poor. So a new type of pneumatic clutch mechanism is designed to meet its technological requirements. For the new mechanism, the motion law of the blanket cylinder can be calculated in the pressing process by complex number vector method and the finite element model has been established, natural frequency, maximum amplitude and mode of vibration of the cylinder can be calculated based on Block Lanczos method. The analysis results show that the relationship between the cylinders is flexible impact at the pressing instant, positioning is accurate, stable and reliable, which meets flexible design requirements. Thus it is important significance to improve design level and the product quality of the domestic printing machine and shorten the gap with foreign advanced printing machine.
Precision Analysis of Free-Station Positioning in Total Station
Authors: Sun Heng
Published: May 2013

This paper examines the precision analysis model provided according to the principle of indirect adjustment, to simulate the positioning accuracy at all different conditions including the location of station in total station, the accuracy of angular and side surveying, and compares the accuracy of free-station positioning for only two back-sight points. The results shown that the accuracy of side surveying for instrument has significant influence on positioning accuracy greater than that of angular survey, and the location of stationing points near to the connection line between two back-sight points was benefit for improving the accuracy of positioning.
Cylinder Micro Leakage Testing System
Authors: Dai Jia Yu , Xing Ke Li , Xu Bing Hui
Published: May 2013

In order to improve the testing efficiency of the cylinder leakage, a measure and control system based on LabVIEW is put forwards into application. This paper introduces a method of cylinder leakage calculation and proposes a cylinder leakage standard curves analysis method, and designs the hardware system mainly using the Mitsubishi PLC and the Art USB5935 acquisition card and the software system based on LabVIEW.
Prediction of Nonlinear Distortion due to Acousto-Optic Interaction
Authors: Wu Jin Ling , Yu Hua Long , Huang Zhan Hua
Published: May 2013

Using the elementary theory of the acousto-optic nonlinear interaction,an empirical formula is developed for the diffracted light in terms of the acoustic power. Using this formula, closed-form expression, in terms of the modified Bessel functions, are obtained for the diffracted-light components resulting from interaction with a multisinusoidal acoustic wave.
The Vehicle Stability Test System Based on Active Brake Control for Overturning Prevention
Authors: Zhao Jian Zhu , Zhang Lu , Zhang Zhong Fu , Wang Guo Ye , Chen Yan
Published: May 2013

Design the structure of the vehicle system for overturning prevention and set up the system dynamic model. Based on the Matlab/Simulink, establish the dynamic simulation system of the vehicle system for overturning prevention for the Chery A3 car. Using the brake / drive integrated ESP control principle, based on the simulation model, respectively simulate and analyze the ESP control performances of the vehicle system and the vehicle system for overturning prevention on different simulation conditions. The study results indicate that when there is no ESP control or ESP control system failure, the vehicle system for overturning prevention can simulate the ESP control performances of the vehicle system effectively, the ESP control performances of the vehicle system and the vehicle system for overturning prevention have remarkable consistency. The theory of the vehicle system for overturning prevention for the ESP control performances test provides a basis for the vehicle stability control performance research.
Comparatively Study of Coaxial Waveguide and Open Coaxial Cavity
Authors: Xie Yong Chao , Shi Jin Yan , Ding Xue Yong
Published: May 2013

In this paper, the computational formula of field distribution in a coaxial waveguide and the field distribution, resonant frequency and Q factors of open coaxial resonator are introduced. The S21 and the field profile of the TEM mode in a coaxial waveguide, and the field profile and E-field of the mode in a coaxial resonator is gained by the software CST microware studio. The truth that an open coaxial cavity is virtually a slow-varied section coaxial waveguide is gained.
Design of Intelligent Hanger Based on AT89C52 Single-Chip Microcomputer
Authors: Jia Xing Jian
Published: May 2013

A new type of intelligent hanger was designed. Wings structure of hanger mechanical part was adopted,screw rod and motor combination of the lifting mechanism can make the wings outspread and fold, unique cover curtain structure was adopted. Cover curtain roll up and down through the motor driving.The control system adopts AT89C51 single-chip microcomputer. According to the information that coming from the rain sensor and the temperature sensor, two stepper motor’s positive and negative rotational motion was controlled.So as to realize automatic adjustment when it rains. The hanger will be automatically closed when the temperature is higher than expectation, and the hanger will be automatically opened when the temperature is less than expectation.The hanger has been produced and has a good performance.
Optimze the Structure of Impeller for Stirred Bioreactor
Authors: Zhu Li Kuan , Song Bo Yan , Wang Zhen Long , Wang Yu Kui
Published: May 2013

This paper mainly makes comparative analysis on four main types of blade in stirred bioreactor by Computational Fluid Dynamics(CFD) simulation. Firstly we establish simulation method suited for stirred bioreactor, then simulate the velocity and shear force of flow field in the bioreactor. No matter from flow field mixing or shear force aspect, Elephant Ear blades is the most suitable for cell large scale culture. At last, it optimizes the installation method and angle of Elephant Ear blades. It concludes that anticlockwise rotation and 45°installation angle is the optimum.
Feed-Forward Integrated with Fuzzy-PID Feed-Back Control of Electronic Throttle Valve
Authors: Wu Jian , Geng Shi Feng , Han Jia Jun , Cheng Yu
Published: May 2013

Nonlinearity of return spring and friction makes the response characteristics of electronic throttle valve difficult to be promoted. In mainly consideration of calls for response rate and dynamic error, we designed the controller which adopting feed-forward control (FFC) and self-tuning fuzzy-PID as feed-back control (FBC) , a simplified electronic throttle model is also used to decrease computation time. As test for the controller, off-line simulation and Rapid Control Prototyping (RCP) technique are both taken. Via substantial measurements and continuous modulation the designment demonstrated excellent behavior.
Feasibility Study on the Boiler Induced Draft Fan Energy Saving Frequency Conversion Retrofit
Authors: Zhao Chuan Zun , Yan Zi Han
Published: May 2013

Aiming at the badly needed goal of energy saving, the retrofit is implemented by adopting the stepless speed regulation of motor driving by the high-voltage inverter to regulate the air quantity. The inverter is taken its character of easy manipulation, small maintenance, high control precision as the advantage to replace the traditional device like air door operated and wind deflector operated methods. Furthermore, the feasibility analysis for the energy-saving effect after retrofit will be conducted. It has been concluded that there are obvious improvements both in energy saving and operational stability after the frequency conversion retrofit on the machine.