bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Influencing Factors of Adiabatic Coating Performance
Authors: Cao Guang Yuan , Guo Han Jie , Li Lin , Li Yong Qi , Peng Jie
Published: June 2014

Microcosmic features of adiabatic coating was observed, influencing factors of adiabatic coating performance were studied by 4 types of agglutinating reagents when the size of hollow tiny bead was 2.5-60μm. Next, carboxymethyl cellulose was introduced, 2.6μm hollow tiny bead was selected to testify antifatigue performance of coating, transmission principle was applied to build one-dimensional mathematic model of adiabatic coating for testifying experimental value, industry test was conducted to check performance of coating in 30t ladle.
Preparation and Tribological Property of Novel Self-Assembled Composite Films on Silicon
Authors: Teng Shu Hua , Pan He
Published: June 2014

Self-assembled composite films of APTES-GA-APTES were successfully prepared on single-crystal silicon substrates through the cross-linking reaction between glutaraldehyde (GA) and two layers of 3-aminopropyltriethoxysilane (APTES). The optimal time to deposit the GA layer on the APTES monolayer was 3 h, during which most amino groups of APTES reacted with the aldehyde groups of GA to form smooth and uniform APTES-GA composite films. The further deposition of another APTES layer led to the generation of three-layer APTES-GA-APTES composite films. Compared to the APTES self-assembled monolayers, the three-layer films displayed a similar surface morphology but a reduced friction coefficient from 0.23 to 0.15 and an extended wear life from 50 s to 820 s due to the introduction of GA.
Microstructure and Properties of Laser Surface Carburized Titanium and Titanium Alloys
Authors: Dai Jing Jie , Chen Chuan Zhong , Li Shou Ying , Zhuang Lei
Published: June 2014

Titanium and titanium alloys are widely used in many fields due to their some characteristics such as light density, high strength and excellent corrosion resistance. However, their practical applications are limited by their poor surface mechanical properties. Laser surface carburizing can improve the surface properties of titanium and titanium via the formation of titanium carbide and other reinforcing phases. In this paper, the properties of the alloyed coatings, the growth morphologies and the formation mechanism of titanium carbide are discussed.
A Study of the Corrosion Resistance of M50NiL Bearing Steel by Ion Implantation
Authors: Jin J. , Chen Y.B. , Gao K.W. , Huang X.l.
Published: June 2014

The corrosion resistance of metal-N double-element alternate implanted M50NiL bearing steel was investigated by potentiodynamic polarization and detection methods of SEM, XPS, AES and TEM. The results showed that ion implanted M50NiL can increase the corrosion potential of substrate, reduce the corrosion active points and inhibit the corrosion reaction induced at the grain boundaries. The formed amorphous layer and strengthening phases take main roles in improving the corrosion resistance of M50NiL bearing steel.
Microstructure Evolution Characterization of Multi-Pass Hot Rolling Simulation of Nb-Ti Microalloyed Steel
Authors: Shen Bin , Zhu Song He , Zhang Heng Hua
Published: June 2014

In this study, a improved mathematical model was developed for Nb-Ti microalloyed steel during hot rolling simulation. Using the compression test, the dynamic and static recrystallization characteristics of Nb-Ti microalloyed steel were studied. Though multi-pass hot rolling simulation, it is found that the recrystallization during hot rolling can play an important role, it can make the mean flow stress lower and refine the grains. And respective comparison between calculated and measured data of microstructure showed some of the validation of the built model. Meanwhile, the evolution characteristic of average austenite grain size during hot rolling can be achieved by theoretical model and experiment.
Effect of Dielectric Properties and Elastic Strain Behavior on x/65/35 PLZT Ceramics in Lanthanum (x) Ions Contents
Authors: Chumprasert Ladapak , Larwongsa Pranod , Limpichaipanit Apichart , Ngamjarurojana Athipong
Published: June 2014

In this paper the effect of lanthanum addition on the phase formation, dielectric and ferroelectric characteristics of x/65/35 PLZT. This ceramics were prepared using mixed-oxide synthetic route via a rapid vibro-milling method. All samples were sintered at 1200°C for 12 h. X-ray diffraction was used to observe the crystal structure. It was found that when increasing lanthanum content, the structure remained rhombohedral. It can be seen that the change of behavior to ferroelectric relaxor with the increasing of lanthanum content resulted in the change of elastic strain
Preparation of Ti-Fe Alloy from Titanium Concentrate by Electro-Deoxidization in CaCl2
Authors: Shi Rui Meng , Bao Long Fei , Zhang Bo
Published: June 2014

Ti-Fe alloy is prepared by the electrolytic reduction of titanium concentrate in molten CaCl2 under argon atmosphere. The formation mechanism of Ti-Fe alloy is discussed. The impact of electrolytic time on product is studied when electrolytic voltage is 3.1V and electrolytic temperature is 900°C. Results show that Ti-Fe alloy with uniform composition can be obtained by this method. The deoxidize product is iron and TiFe alloy by order. The reduction of Ti is a multi-step process and the intermediate products include CaTiO3,TiO2, Ti2O3, TiO,Fe, TiFe2.
Fabrication and Properties of Composites of Linear Polyacrylamide and Functionalized Carbon Nanotubes
Authors: Yang Run Miao , Liu Yu Hai , Dong Guan Xiu , Zhao De Jian
Published: June 2014

Polyacrylamide (PAM) was chemically anchored to the surface of multi-walled carbon nanotubes (MWCNTs) by atom transfer radical polymerization (ATRP) of acrylamide (AM). It started from the functional groups such as –COOH on the sidewall of MWCNTs, which derived from the oxidation of carbon nanotubes. FT-IR and 1H NMR results shown that the multi-walled carbon nanotubes grafted PAM (MWCNT-g-PAM) have been successfully carried out. The MWCNT-g-PAM showed different relative weight loss kinetics with PAM determined by thermal gravimetric analysis (TGA). The transmission electron microscopy (TEM) shown that the PAM grafted polymer was wrapped on the surface of carbon nanotubes.
Effect of Mineral Admixtures on Rheological Properties of Cement Paste
Authors: Zhang Lin Chun , Zhang Ai Lian
Published: June 2014

The Marsh cone method and rotary viscosimeter are used to study the effect of mineral admixtures such as ultra-fine fly ash, ultra-fine slag, zeolite powder and silica fume on rheological properties of cement paste. Test results show that the optimal ratio of ultra-fine fly ash, ultra-fine slag, zeolite powder and silica fume are respectively 20%, 20%, 10% and 8%. And the optimized mix proportion is the composition of 8% silica fume and 12% slag. By using water reducing agent and mineral admixtures we could get the cement paste which has good liquidity and no bleeding.
Effect of the Composite of Fly Ash and Slag on Alkali-Silica Reaction
Authors: Liu Tong Chao , Xiao Bo , Li Gu Hua , Luo Nian Hong , Zhang Long Sheng
Published: June 2014

The study used the method of accelerated mortar bar test to study alkali aggregate reaction (ASR) with sandstone aggregate. Both fly ash and slag can inhibit the expansion of mortar bar. Results show that 50% slag can inhibit ASR reluctantly, but 10% fly ash and 20% slag can inhibit ASR very well, and the inhibitory effect of fly ash is far better than slag. Because of the high content of CaO in slag, it has inhibit and promote aspects, when the ASR is fierce, slag can inhibit ASR, otherwise slag can promote ASR.
Analysis of the Influence of Clay Dosage and Curing Age on the Strength of Plastic Concrete
Authors: Hu Liang Ming , Lv Xue Liang , Gao Dan Ying , Yan Ke Bing , Song Shuai Qi
Published: June 2014

This test is sand coarse aggregate ratio, ratio of water to cementitious material, cement dosage, bentonite dosage, type of sand and type of bentonite in certain cases, studied the influence of clay dosage and curing age on the basic mechanical properties of plastic concrete, it is concluded that the best clay dosage; the clay dosage has a great influence on all the strength of plastic concrete (compressive strength, splitting tensile strength, rupture strength), with the increase of clay dosage and all kinds of strength decreased; when clay dosage is certain, various strengths of plastic concrete are increased with the increase of curing age, curing age has a great influence on various strengths of plastic concrete. If the long curing age (540d) intensity values as the actual strength of plastic concrete, growth rate of strength of 540d long age relative to the 28d age about 120%, this shows that plastic concrete has a higher late strength, plastic concrete curing age longer than concrete curing age.
Research on Improving Shrinkage Performance of Cement Stabilized Gravel with Waste Rubber Particles
Authors: Liu Qi Yang , He Min , Wang Jue
Published: June 2014

Cement stabilized gravel has good characters like high strength, good stability, anti-erosion properties and better anti-fatigue property, but it is easy to produce desiccation cracks when humidity changes (caused by evaporation), resulting in reflection crack on the bituminous pavement surface, and then influences performance and the service life of the pavement. Along with the changes in traffic conditions, seme-rigid asphalt concrete pavement meet the two major challenges as early damage and heavy traffic. It has significant economic and social significance that support a method of construction and conserve of seme-rigid pavement which accommodate heavy traffic highway and has guidance and reference value in other conditions.It is analyzed by comparison between the performances of mixture with best amount of admixture which obtained by shrinkage test and mixture without admixture.
Study on the Key Technology of Hot Regeneration of Plant-Mixed Asphalt Material
Authors: Jin Qing , Cui Xin Zhuang , Lou Jun Jie , Tang Wei Ze , Sui Wei , Gao Zhi Jun
Published: June 2014

It is necessary to mend the shattering process and heating technique in order to improve the technology of hot regeneration of plant-mixed old asphalt. The temperature and the reactivation of old asphalt material is supposed to be better controlled as well as the process of mixing and paving roadways as a result of technological improvement. With the reconstruction works of the highway G205 from the Yellow River Bridge to the Liuqiao roundabouts, research of old asphalt mixture has been carried out and all the products turned out to meet the design requirements, according to the results of thimble test, water stability test and tension test in low temperature of Marshall specimen.
A Novel Model for Predicting the Thermal Conductivity of Fiber Reinforced Ceramic Materials
Authors: Xu Rui , Mao Jun Kui , Zhang Jing Yu , Lou De Cang , Guo Wen
Published: June 2014

The prediction of fiber reinforced ceramic is one of the most important procedure when investigating the application of ceramic composite. Numerical simulations were applied and a novel model was brought out in this paper. Firstly, four different models for predicting thermal conductivities of unidirectional fiber reinforced materials were compared, which include the Rayleigh,LN,ST and TE model,. It shows that Rayleigh model and LN model have good precision only in low fiber volume content cases. There existed big differences between the experimental and numerical results if predicted the high fiber volume content with either these four models. Then a novel model based on LN model was studied with the correction of the representative volume element method. Further comparison results indicate that the error can be reduced as 55.6% with this novel model. At the same time, the longitudinal (k11) and transverse (k22) thermal conductivities predicted by the novel model were also analyzed. It was found that k11 had a linear relationship with fiber volume fraction and thermal conductivity ratio (p). But k22 had a nonlinear relationship with fiber volume fraction, which increased much greatly when fiber volume fraction increasing at high fiber volume fraction and p>1.
Research Progress of Thickening Agents for Supercritical CO2
Authors: Sun Wen Chao , Sun Bao Jiang , Fan Zhi
Published: June 2014

Although supercritical CO2 fracturing has incomparable advantages compared to hydraulic fracturing as a new recreating technology of shale gas reservoir, the application of this technology has been limited by the low viscosity and weak carrying capacity of proppant. It’s critical to enhance the viscosity of supercritical CO2 by adding thickening agents. Thickening agents for supercritical CO2 thathave been studied by researchers mainly contained polymers, small molecular compounds and surfactants. Thickening agents that match with CO2 are characterized by low cohesive energy density, low polarity, high free volume and Lewis base. It’s necessary to study the interaction between thickening agents and CO2 by molecular simulation to design inexpensive, green thickening agents which could increase the viscosity of supercritical CO2 remarkably under low concentration.
Stress-Stain Response of PVC Geomembrane under Uniaxial Tension Test
Authors: Wu Hai Min , Shu Yi Ming
Published: June 2014

The mechanical property of polyvinyl chloride (PVC) geomembrane was usually expressed using engineering stress-strain response in traditional uniaxial tension test. By failing to account for deformation of specimen during the test, the deviation of true stress and strain maybe caused from the test results. In this paper, the true stress-strain response of PVC geomembrane was investigated using uniaxial tension test. The photographic analysis method was used to measure axial and lateral true strain of specimen. The Poissons ratio and true stress were also acquired based on measured true strain in the test. Then the true stress-strain relationship was obtained from the test results. By comparing with the engineering stress-strain results expressed by traditional method, it can be found that the engineering stress-strain result is unreasonable. The engineering stress-strain expression easily leads to the underestimation of the true stress.
Applying BP Neural Network Model to Forecast the Largest Coiling Torque of down Coilers
Authors: Zhao Ke , Wang Zhi Gang , Liu Chang Ming
Published: June 2014

Down coiler is an important equipment of hot rolling mill. The coiling torque is changing constantly in the process of strip steel coiling, and the largest coiling torque depends on several factors, such as the material and specification of coiling strip, the coiling temperature and the process parameters and so on. Only when the largest coiling torque is less than the carrying capacity could the coiler work in security. A topology relationship of the largest coiling torque among the materials, the specification of the strip and the coiling temperature is established. Based on the BP(backward propagation of errors) artificial neural network, a predicted formula model of the largest coiling torque in coiling high strength strip is built, which provides a theoretical basis for the development and utilization of the largest working potential of the down coiler. Keywords: Down Coiler; BP Neural Network; Coiling Torque; Forecast
Microstructure and Mechanical Properties of High-Entropy Alloys CoCrFeNiAl by Welding
Authors: Cui Lang , Ma Bing , Feng Sheng Qiang , Wang Xiu Ling
Published: June 2014

Five common elements Co, Cr, Fe, Ni and Al were selected, and CoCrFeNiAl was prepared by arc-melting. The microstructure and mechanical properties after spot welding were studied. The results show that the cast microstructure of high entropy alloy CoCrFeNiAl is relatively uniform with a dendritic morphology. The heat is inversely proportional with the alloy grain sizes. The greater the heat is, the smaller the grain size is, which leads to the higher hardness and more uniform tissue. But there is a critical value of the heat(Hcrit) in spot welding. When Hactu(actual heat) exceeds Hcrit, it will adversely affect the performance, resulting in crack, splash and other defects.
Microstructure and Mechanical Properties of Brazed Joints Used in Electronic Devices
Authors: Wu Xue Rui , Qu Wen Qing , Li Hai Tao
Published: June 2014

The microstructure and mechanical properties of brazed joints of oxygen-free copper and oxygen-free copper, nickel-plated kovar, monel, nickel-plated stainless steel were respectively studied by using AgCu28 and AuCu20 filler metal. Effects of different filler metal on microstructure of the brazed joints were analyzed through metallurgical microscope, SEM, EPMA. The brazed joints tensile strengths were analyzed through tensile test. The results indicate that the brazing process of oxygen-free copper and nickel content alloy used AgCu28 filler metal, nickel element is easy to diffused into AgCu28, AgCu28 filler metal with nickel element wetting spreadability along grain boundary of the oxygen - free copper, resulting in the penetration of the grain boundary of the oxygen-free copper. The joints brazed by AuCu20 filler metal have the better performance than the joints brazed by AgCu28 filler metal.
Numerical Simulation and Optimization Technology of Lost Foam Casting
Authors: Chen Hong Ze , Dong Hong Zhao , Shan Zhong De
Published: June 2014

The filling and solidification process of casting that is closely related to lots of casting defects and has significant effect on the mechanical properties of castings. In this paper, the research status and development direction of numerical simulation technology of casting, especially of lost foam casting were reviewed and discussed. Also a brief introduction of the basic situations and product characteristics of several outstanding cast filling and solidification simulation softwares were summarized. In addition, the actual domestic application status of numerical simulation technology of lost foam casting in the foundry enterprises was analyzed and some suggestions were given as well.
Thermal Degradation Behavior of Polypropylene and Ethylene Vinyl Acetate Copolymer Treated with Intumescent Flame Retardants Containing Caged Bicyclic Phosphates
Authors: Li Xin , Ou Yu Xiang
Published: June 2014

Polypropylene (PP) and ethylene vinyl acetate copolymer (EVA) were treated with intumescent flame retardants containing caged bicyclic phosphates. The behavior of thermal degradation of the flame-retarded PP and EVA were studied by TG, DSC, and the FTIR spectra of PP’s residues at different temperature were recorded. In addition, the possible thermal degradation and char formation mechanisms were analyzed and discussed.
Experimental Research on Grinding Surface Layer Behavior and Process Parameter Optimization of Spiral Bevel Gears
Authors: Ming Xing Zu , Li Zhong Gun , Xiong Xian Wen , Zhou Jing
Published: June 2014

Based on the test analyses of grinding surface layer behavior of spiral bevel gears, many conclusions are gotten. Compressive residual stresses are occurred on grinding tooth surface, tensile residual stresses are located in tooth layer, and change laws of grinding residual stresses are different from ones of grinding surface roughness Ra as the grinding process parameters. A temper layer is occurred in tooth layer after normal grinding, and the micro-hardness of grinding surface is lower. When arriving at the critical condition, namely grinding temperature is above 600 degree Celsius, and metamorphic layer depth is greater than 0.2mm, different degree of grinding burn is produced, and their microstructures are changed. Based on grinding orthogonal test L16(45), the optimizing configuration of grinding process parameters of spiral bevel gear is obtained by using a mean variance analysis of integrated balance method. Based on the test optimization of grinding surface layer behavior, the comprehensive performances of grinding surface, such as grinding residual stresses, surface roughness, micro-hardness and structure, metamorphic layer depth et al, are better. These provide a basis for improvement of grinding surface quality of spiral bevel gears.
A Study on Development of the Optimal Neural Network in GMA Welding Process
Authors: Wu Qian Qian , Lee Ji Hye , Lee Jong Pyo , Park Min Ho , Kim Young Su , Kim Ill Soo
Published: June 2014

Gas Metal Arc (GMA) welding is considered as a multi-parameter process that it’s hard to find optimal parameters for good welding. To overcome the problem, an artificial neural network based on the backpropagation algorithm was built to realize the relationships between process parameters and welding quality as output parameter. In this study, Mahalanobis Distance (MD) was employed to evaluate the availability of a given welding parameters which was proved to performance well in multivariate statistics. Input parameters such as welding current and arc voltage were chosen due to their significant influence on the welding quality. To improve the precision of given parameters’ evaluation, neural networks with different configurations were verified. The analyses on the measured and predicted MD by the proposed neural network were conducted. The proposed neural network based on the error backpropogation algorithm was proved to have high reliability to evaluate process parameters, which further makes it available in on-line monitoring system.
Fabrication and Characterization of SiC-Coated Multi-Walled Carbon Nanotubes Reinforced Reaction Bonded SiC Composite
Authors: Song Ning , Liu Hong , Yuan Yong Tao , Fang Jing Zhong
Published: June 2014

SiC-coated multi-walled carbon nanotubes (SiC-coated MWNTs) made by RF magnetron sputtering were introduced into the SiC suspensions to enhance the mechanical behaviors of reaction bonded silicon carbide ceramics. The composites were prepared by the epoxy resin curing and liquid silicon infiltration at 1550°Cfor 60min. The distribution, morphology, and reinforcing behaviors of MWNTs were investigated. X-ray diffraction (XRD) reveals that the MWNTs were reserved during the reaction sintering. The flexural strength and fracture toughness increase with MWNTs ranging from 0wt% to 0.5wt%, reaching the peaks value of 347MPa and 4.3MPam1/2 respectively at the MWNTs fraction of 0.5 wt%. This improvement derives from the MWNTs pullout. The consequent decline at MWNTs fraction of 1wt% is resulted from the corrosion of agglomerated MWNTs and the increase of residual silicon.
Optimization of Drafting Conditions in the Break Drafting Zone Additional Pressure Bar on INA-V Spinning Frame
Authors: Feng Qing Guo , Ren Jia Zhi , Zhang Yi Feng
Published: June 2014

To improve the yarn quality, the pressure bar was installed in the break drafting zone of the INA-V spinning frame. The process parameters were optimized in the break drafting zone with pressure bar of the INA-V spinning frame, the drafting principle in the break drafting zone with pressure bar of INA-V spinning frame was analyzed, and the sliver configuration was observed in the break drafting zone with pressure bar. The result revealed that installed the pressure bar in break drafting zone after, when the roving twist factor was small, CV%, thinness, thickness and neps of the yarn spun decrease as the break drafting ratio increase; when the twist factor of roving was larger, the break draft ratio as 1.3 time was optimum drafting conditions. The yarn quality was improved as roving twist increased.
Non-Isothermal Resistance Heating for Hot-Stamped Parts with Tailored Properties and Tempering Treatment on Directly Hot-Stamped Parts
Authors: Sun Cai Na , Zhang Heng Hua
Published: June 2014

Non-isothermal resistance heating in the hot stamping of quenchable steel sheets was developed to produce ultra-high strength steel formed parts with tailored properties. The heating temperature of parts is related with width of samples heated by resistance heating. With the same input energy, the strength in the narrow portions is high owing to the high energy density and that in the wide portions is low owing to the low energy density. Hat-shaped products having a tensile strength arrange from 600 MPA to 1800 MPa were formed. The tempering treatment on the directly hot-stamped boron steel resulted in better mechanical properties and higher formability index. The SEM figures indicates that the nano-carbide formation during the tempering treatment were suggested as the evident reasons for the occurrence of the mentioned robust properties. Finally the combination of temperature 250 ℃ and holding time 45 min can achieve the best comprehensive mechanical properties.
Research on the Ni-Cr Alloy Coatings on the Hydraulic Prop by High-Frequency Induction Cladding
Authors: Zhu Fu Dong , Zhu Bi Yun , Liu Juan
Published: June 2014

Ni-based cladding coatings are prepared on the surface of hydraulic prop mobile column by high-frequency induction cladding with different current. Microstructures of coatings are analyzed by metallographic microscope as well as SEM, while coatings and matrix elements are analyzed by EDS. The results show that metallurgical bonding is formed among transition regions of matrix and coatings with obvious white band, when cladding frequency is 250KHz and current is 1160A. The microstructures of coatings are eutectics of austenite + carbide, relatively uniform. During the process of cladding, Fe as well as Mn in matrix permeats to coatings; while Si element in coatings permeats to matrix. As a result, the Fe content of trasition regions is raised, and the contents of Ni and Cr is comparatively reduced.
Evaluation of Thermal Fatigue Crack States of Super-Hard Cutting Tools Based on the Extension Theory
Authors: Guo Cai Fen , Dong Zhi , Wan Chang Dong , Zhang Yong Kang
Published: June 2014

A monitoring system is set up to get the machining process where super-hard cutting tools are used under surveillance. Signals such as the milling force signal, the acoustic emission signal, the vibration signal and the temperature signal are all collected to reflect tools practical conditions. Based on the extension theory, the partial-field matter-element, the full-field matter-element and the awaiting one are formed to evaluate the thermal fatigue crack states with the help of the relating function and the relating degree equation. Results show that this method is very reasonable and practical.
The Swelling Properties of Nitrile Rubber with Different Acrylonitrile Contents in Cyclohexane Medium Research
Authors: Wang Hui Ming , Lv Xiao Ren , Wang Shi Jie
Published: June 2014

By the research of swelling and mechanical properties of nitrile rubber with different acrylonitrile contents in cyclohexane medium, the influences of physical and mechanical properties with diffrent acrylonitrile contents is analyzed. The results indicated that: the quality of all the nitrile-butadiene rubbers with different acrylonitrile contents is increasing with the increase of soaking time. It increases rapidly in the first 24 hours then gently. With the increase of the acrylonitrile content, the increasing proportions of swilling quality is reduceing. But N40 cyclohexane performance is better relatively. After drying the three kinds of rubber in 110 degrees Celsius, all the qualities is lower than the original value. It means that in swelling process, the material in rubber is pulled out and the distance between the rubber molecules decreases. After swilling the three kinds of rubber, their hardness decreases and the decline proportion is reducing by the increase of acrylonitrile content. With different acrylonitrile contents and swilling times the nitrile rubber shows different mechanical properties. After soaking three kinds of rubber their tensile strengthes are on the decline by swilling time and their rates of permanent deformation are on the rise. It shows that as the swelling time extended, the mechanical properties descends and the corresponding indicators after soaked and dried is lower than the quantitative values after soaked. The study has a certain reference of design of ESPCP stator under certain operating conditions.
Microstructural and Mechanical Properties of 9%Ni Steels Used for the Construction of LNG Storage Tanks
Authors: Hany Sara , Duponchel Benoit , Poupin Christophe , Kais Antoine Abou , Dewael Dorothee , Vogt Jean Bernard , Bouquerel Jeremie , Kacem Hassine , Mouftiez Anne , Hariri Said , Milochova Mariana , Bychkov Eugene , Aad Edmond Abi
Published: June 2014

The growing needs for energy combined with the will to reduce CO2 emissions lead to the increase of the demand for liquefied natural gas (LNG), which will be stably available for many decades to come. Cryogenic materials used for the manufacture of the inner tanks for LNG storage are composed of 9% Ni steel plates with excellent low-temperature toughness, great ductility and crack resistance for a high safety level. To guarantee the reliability and safe operation of large-scale metallic structures exposed to cryogenic temperatures for extended periods, it is important to evaluate structural and mechanical properties of the metal base as well as the welded zone in their own operating conditions in order to prevent damages that could occur.
Influence of Si Content on the Characteristics of Al-Zn-In-Mg-Ti Sacrificial Anode
Authors: Wang Shu Sen , Liang Cheng Hao , Huang Nai Bao
Published: June 2014

The influence of Si on the corrosion behaviour of Al-Zn-In-Mg-Ti alloy was investigated by the microstructure observation and electrochemical measurements in order to improve its corrosion non-uniform and electrochemical properties. The results show that the current efficiency of Al-5Zn-0.02In-1Mg-0.05Ti-0.09Si (wt.%) alloy corroded uniformly reaches 92%. It presents the property of low resistance and high capacitance. While the Si content exceeds 0.12 wt.%, the resistance of active dissolution increases gradually. The current efficiency decreases obviously. The results indicate that the electrochemical characteristics and corrosion uniformity can be improved significantly after adding 0.09 wt.% Si into Al-Zn-In-Mg-Ti alloy.
Study of Surface-Enhanced Raman Spectroscopy of Crystal Violet in Acid Aqueous
Authors: Jia Xin , Dong Ling Ling
Published: June 2014

We reported the spectra intensity of surface enhanced Raman scattering (SERS) for crystal violet with changing the acid concentration. The SERS signals of crystal violet ascended firstly and then descended with the acid concentration increasing when we put the nitric acid into the crystal violet-silver colloid system. The phenomenon was considered to be associated with the interaction between hydrogen ions and crystal violet, which may influenced the SERS signals.
Investigation of the Fluorescence Spectra of the Fluorescent Dyes
Authors: Sukprasong Saksit , Promjun Tanabat , Chokethawai Komsanti , Ngamjarurojana Athipong
Published: June 2014

The experiment was conducted to study the effects of concentration, temperature and solvent on the luminescence decay curves obtained in laser-induced fluorescence (LIF) experiment from fluorescent orange dye. Sample solutions of fluorescence dye were prepared by mixing with ethanol solvents at different concentration. The sample was illuminated with a radiation of 470 nm using a blue laser excitation source. Luminescence spectra were recorded using a compact fiber coupled CCD spectrometer and the results were analyzed.The results showed that both concentration and temperature affected the luminescence decay of orange dye in the same way. The luminescence decay was decreased when the concentration and temperature were increased.The appearance of peak positions was slighly shifted to higher wavelength (lower photon energy) when concentration were varied. Then the results of concentration effect were analyzed using peak fit, the appearance of peak positions was slightly shifted from 601.51 to 604.12, 607.64, and 618.44 nm at the concentration of 50, 60, 70 and 80 % by volume, respectively.
A Computational Fluid Dynamics Method for Resistance Prediction of the Floating Hull of Wave Glider
Authors: Elhadad Aladdin , Duan Wen Yang , Deng Rui
Published: June 2014

The wave glider is a surface vehicle with an attached sub-surface wing system which propels the surface component forward, negating the need for a motor. Wave glider could be used for intelligence, surveillance, passive monitoring of marine life, monitoring exclusive economic zones for fishing and other economic resources that are important and useful to coastal countries. Monitoring of coastal waters normally requires large amounts of expensive surveillance. They can be used to find and research resources and fisheries at a fraction of the cost of other methods. Since the wave glider can either be programmed for a journey or to keep station, it is looked at as an alternative for expensive moored buoys. In this paper we present a method focused on the mesh generation to predict calm water resistance for the floating part of the wave glider (the hull).
In this study a wigley hull form (4m) used as the floating hull has been investigated in order to predict the fluid flow of the ship using computational fluid dynamics (CFD). Calculations for total resistance are carried out for Froude numbers in the range of 0.10 to 0.40. Commercial CFD software fluent is used to investigate the fluid flow of wigley hull. Three different mesh sizes are used in this study to calculate the mesh effects. The results obtained from CFD calculations for total resistance are compared with the experimental results for accuracy of the solution parameters. The comparison shows a good agreement between experimental and CFD results.
The method is evaluated by comparing the numerical predictions for wigley hull form (2m) with wigley hull form (4m) using the same mesh sizes under the same conditions in an attempt to design the floating hull of wave glider . The results obtained from CFD calculations are compared for accuracy of the solution parameters and the method is useful and acceptable.
Optimization Design of Transverse Flux Permanent Generator Based on Response Surface Method
Authors: Gao Zhong Yong , Xie Jia , Wang Shi Ming
Published: June 2014

To consider the complicated situation fully such as saturation, leakage flux and so on, and to make the generator size to meet the design requirements, we use the methodology of response surface method combined with center combination design to optimize the transverse flux permanent generator. At first, the optimization goals and the optimization design variables are set on the basis of the finite element model in the initial design. Then an optimized design model of the generator is built by the variable sequential combination response surface methodology. Experiment is arranged by the center combination design methodology, and optimal parameters are selected through response surface method. At last, we get all the structural dimensions of transverse flux permanent generator. The optimization makes the output voltage meet the design requirement.
Energy Control of HEV Based on Fuzzy Controller Optimized by Particle Swarm Optimization
Authors: Zhao Li Yan , Zhang Niao Na
Published: June 2014

Energy control of HEV plays a very important role in the process of HEV design, which is directly related to the safety and feasibility. Considering the drive system of HEV is nonlinear and complex, a fuzzy control strategy which is combined with particle swarm optimization algorithm is designed to realize the energy control of HEV. Fuzzy control strategy does not need to built accuracy mathematics model and has good robustness, but it mostly depends on engineering experience and has poor ability of self-learning. So particle swarm optimization algorithm has been added to solve these disadvantages of fuzzy control strategy. In conclusion, this method can not only keep the advantage of fuzzy control strategy, but also has ability of self-learning and self-adapt because of particle swarm optimization added. And the simulation proves that this method is feasible and effective.
Non-Ideal Excitation Approach for Piezoelectric Vibration Based Energy Harvesting
Authors: da Costa Ferreira Douglas , Chavarette Fábio Roberto , Henrique Cerqueira Costa Basquerotto Cláudio , Peruzzi Nelson José
Published: June 2014

Common solution for energy harvester device is project design according harmonic excitation around natural frequency matching excitation source. Environment vibration is random and wide band causing short time of resonance in disagreement of project objectives. Control driven of energy harvesting to take advantage of the higher vibration range can results in greater energy converted. This study investigates a non-ideal excitation behavior and their efficiency in convert electricity via piezoelectric direct effect from the available system energy compared to harmonic excitation source. Numeric evaluation was performed based in bimorph piezoelectric beam in dimensionless consideration. Chaos behavior and harvest energy capability were compared from non-ideal to harmonic excitation. Results demonstrate considerable higher quantity of energy available for non-ideal approach compared to harmonic resonant design and encourages advance study to control and enhance energy from random and wide band vibration source.
Photovoltaic Power Generation Data Preprocessing Using Wavelet Thresholding
Authors: Bai Kai , Qu Hong Da , Zong Jin , Li Zhi , Zhai Hua Xin , Zhao Zhou
Published: June 2014

The accuracy of power prediction of photovoltaic power generation will be reduced if there are noises in the historical data of photovoltaic power generation. It is necessary to eliminate noises in the historical data. First, the power generation can be arranged in a two-dimensional data set by date. Secondly, the grayscale image matrix will be obtained after data normalized. Thirdly, two-dimensional wavelet based image de-noising method will be used in the matrix de-noising. Finally the real historical data will be obtained through anti-normalization the matrix which is already de-noised. We will analyze its results feasible and effectiveness.
Application of AM-OLED Micro-Display in Stereo Display System
Authors: Tai Yong Hang , Shi Jun Sheng , Chen Zai Qing , Li Qiong , Zhuo Bin
Published: June 2014

OLED micro-display is applied widely in the HMD stereo display field. Based on dual 0.5 inch 800×600 high resolution AM-OLED displays, we proposed a 3D circuit design scheme which used PCs VGA interface as video input, PIC18LF2550 as the MCU. According to the principle of the human eye binocular disparity, PC stereo video sources achieved odd frames and even frames displaying simultaneous in two AM-OLED panels, which implemented the 3D function. Display system has been tested by playing the stereoscopic video source of the left and right sides format form the PC and the effect presented a good performance which verified the effectiveness of the proposed scheme.
Modeling and Simulation Method of Component Based Petri Net
Authors: Zhang Yao Hong , Zhang Xian Feng
Published: June 2014

The structure of Petri net model is relative fixed after it is built, so it cant describe dynamic change behavior of real system structure easily. Description formalness, coupling mechanism and simulation method were presented, the dynamic change of Petri net structure in simulation run was realized based on the idea of software component design. The reuse capability of Petri net model is enhanced, integration with other models is convenience and hierarchical modeling mode is realized, and the capability of modeling and simulation of Petri net is improved.
Numerical Movement Tracking of Mitral Valve Annulus
Authors: Zhang Wan , Yin Ran , Deng Yu Xiao , Zeng Jun Yi , Ding Lu , Li Yi Peng
Published: June 2014

Clinical diagnosis and therapy planning are increasingly often supported by 3D imaging modalities. Visual and quantitative evaluation of the valve is an important step in the clinical workflow according to experts as knowledge about mitral morphology and dynamics is crucial for interventional planning. We consider optimal matching of the annulus curves as sub-manifolds by a variational approach based on diffeomorphic transformations.The performance of the algorithm is illustrated by numerical results for examples from medical image analysis.
Simulation of Ising Model by Monte Carlo Method
Authors: Song Cui Ying , Li Chuan Dong
Published: June 2014

Simulating Ising model to calculate magnetization intensity by Monte Carlo method. The Ising model was introduced simply, sampled importantly, and calculated with programming. It shows the dependency relationship between the magnetization intensity and the size of dot-square line in different temperatures for Ising model. It cans edulcorate the approximation of analytic method by computer simulating. It obtains a method to appraise a model right or wrong by comparing the model and the experimental data.
Background Extraction by Fast Independent Component Analysis in Video Surveillance
Authors: Rui Ding , Jin Tang , Wei Wang
Published: June 2014

To solve dynamic background extraction in complicated outdoor surveillance, a method of background extraction based on fast independent component analysis (FastICA) is presented. Since foreground regions and background in an image are considered to be independent, and background images in video show a high correlation coefficient, the method can directly recover the background signal without recover other source signals. In this paper, the principle of FastICA are introduced, and the detailed processes of the method and results are given, which show that the method can realize extracting background image .
Construction and Sharing of Library Digital Resources in China and Southeast Asia
Authors: Thuy Do Thi Thanh
Published: June 2014

Resources development & sharing has become an important subject of widespread concern in the world and it is the inevitable demand of information society development. Sharing is not only a useful way to save money, reduce duplication of investment, improve resource utilization and realize resources complement, but also an important way to greatly improve the information flow and information services support capabilities, and promote society access to information in general. This paper introduces the importance of resources sharing between the libraries of China and Southeast Asian and it refers to the cooperation ways of digital resources sharing.
The Design and Simulation of Collision Avoidance System Based on Dual-Mode Collaborative
Authors: Chen Shuo , Yu Ji Ming , Liu Yan
Published: June 2014

This article establish a model to give a detailed analysis of road vehicle collision avoidance systems according to the angle between vehicle and obstacle, and raise a vehicle collision avoidance detecting mechanism based on location mapping and distance detecting; furthermore, The authors combined this mechanism and BP artificial neural network to establish a new vehicle collision avoidance systems which is based on the collaboration between precise distance angle model and BP artificial neural network. We called this mechanism as BP artificial neural network vehicle collision avoidance model, the abbreviation is BP collision model. The convergence simulation of such model present that this model can resolve problem of collision avoidance and plan driving Path very well.
Comparison of Hydrogen Sulfide Sensing Properties between Multiple-Walled Carbon Nanotubes (MWNTs) and MWNTs-HAuCl4 Materials
Authors: He Si Xuan , Xie Guang Zhong , Jiang Ya Dong , Zhang Guang Di , Zhou Yong
Published: June 2014

The rapid and precise detection of hydrogen sulfide (H2S) has great significance due to its high toxicity. In this work, the response properties of multiple-walled carbon nanotubes (MWNTs) and MWNTs-HAuCl4 to H2S at room temperature were compared. Scanning electron microscopy (SEM) technique was used to characterize MWNTs and MWNTs-HAuCl4 films. It was found that sensors with MWNTs-HAuCl4 exhibited much higher response value. On the other hand, sensors with MWNTs were observed to have faster response time and better recovery properties.
Hyaluronic Acid Functionalized Porous Silica Nanoparticles for Drug Delivery and Release
Authors: Cui Ling Yuan , Li Yan Hui , Zhang Wei , Zhang Jing Peng , Duan Qian
Published: June 2014

In this paper, we reported a facile strategy to synthesize hyaluronic acid (HA) conjugated porous silica nanoparticles (pSiO2) as drug carrier. The pSiO2 were prepared by solid nano-silica nanoparticles with “surface-protected etching”. Morphologies of solid and porous silica nanoparticles were characterized by SEM and TEM. Amino groups were introduced on pSiO2 to graft HA as cancer targeting ligand. Then rifampicin used as model drug was loaded in pSiO2-HA. The results indicate that pSiO2 can perform a certain degree of slow release. Overall, the system might open the door to a new generation of carrier system for site-selective, controlled-release delivery of anticancer drugs.
Preparation and Characterization of Fibrillated Nanofibrous Filter Material
Authors: Yu Tian , Jiang Yan Bin , Hu Jian
Published: June 2014

The nanofiber, which diameter less than 1000 nm, has been discovered as advanced fiber material for high efficiency filtration. Tencel fiber is a new kind of regenerated fiber which can be easily fibrillated by a mechanical beating process to form nanofiber morphology. The present study shows the nanofiber morphology of Tencel fiber and investigates how the structure and properties of filter material change with the impact of fibrillated nanofiber. The results show a mass of nanofibril appeared after the Tencel fiber is intensively beat. At the same time, the air permeability and pore size of filter material is decreased with the decrease of fibrillated nanofiber content while the strength gets an opposite trend. Whats more, the filtration efficiency of the filter material is significantly enhanced by fibrillated nanofiber which filtration rate achieves 6.3 for particles bigger than 4 μm at 20 wt%. This paper has shed some light on the application of fibrillated fibrillated nanofiber to enhance the efficiency of filter material effectively.
Graphene/Sulfur Nanocomposite for High Performance Lithium-Sulfur Batteries
Authors: Ma Shao Wu , Zhao Dong Lin , Yao Ning Na , Xu Li
Published: June 2014

The graphene/sulfur nanocomposite has been synthesized by heating a mixture of graphene sheets and elemental sulfur. The morphology, structure and electrochemical performance of graphene/sulfur nanocomposite as cathode material for lithium-sulfur batteries were systematically investigated by field-emission scanning electron microscope, X-ray diffraction and a variety of electrochemical testing techniques. The graphene/sulfur nanocomposite cathodes display a high reversible capacity of 800-1200 mAh g-1, and stable cycling for more than 100 deep cycles at 0.1 C. The graphene sheets have good conductivity and an extremely high surface area, and provide a robust electron transport network. The graphene network also accommodates the volume change of the electrode during the Li-S electrochemical reaction.
Effects on Characteristics of the SiO2-to-Na2O Ratio on Nano-SiO2 Metakaolin-Based Geopolymers
Authors: Lin Kae Long , Gao Kang , Wang De Ying , Luo Kang Wei , Chang Wen Hsuan , Huang Dian Yi , Cheng Hui , Cui Rong
Published: June 2014

This study explores the effects of the SiO2/Na2O molar ratio (1.0-2.0) on the properties of 1% nanoSiO2 metakaolin-based geopolymers. The porosity, flexural strength, DTA/ TGA, and NMR are investigated to study the mechanical and microstructure properties of the geopolymers. The results show that the flexural strength increased, and that the products of geopolymerization filled pores with curing time, causing the microstructure to become denser. Moreover, a nanoSiO2 metakaolin-based geopolymer sample with a SiO2/Na2O ratio of 1.5 exhibited more strength and less porosity. Applying the 1% nanoSiO2 to a geopolymer enhances compactness, improves uniformity, and increases strength.