bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of Structural Degradation of AlCu4Mg1 for Extruded Stringer Type Specimens Exposed to EXCO Solution Environment
Authors: Eremiáš Boleslav , Kubatík Tomáš , Kalabisová Eva
Published: July 2011

Results are summarized of feasibility of using model for description of exfoliation corrosion (EC) in modeling of structural degradation of AlCu4Mg1 (Al2024) on extruded stringer type specimens in EXCO solution for different times of exposure. The effect of time for time development of this localized form of corrosion was assessed by using the approach of Robinson. Briefly, this approach makes possible description of intergrannular penetration observed under blisters formed by voluminous corrosion products. However, intergrannular stress supposed to be resulting from the expansion of corrosion products along dissolved grain boundaries is not taken into account in this model. Possible application of concept of intergrannular stress incorporation into EC model is discussed for modeling of structural degradation of Al2024 in EXCO tests.
The Metallographic Structure and Mechanical Properties of the Brazing Weld of 3003 Aluminum Alloy
Authors: Liang Xing Hua , Jie Xiao Hua
Published: July 2011

The microstructure and properties of brazing weld of 3003 Aluminum Alloy has been studied by using the methods of microstructure observation(SEM), and mechanical-ability was tested. The results showed that the tensile strength reaches 146.2MPa which is close to that of the parent metal. The metallographic structure is α(Al) and α(Al)+Si eutectic structure. The metallographic structure affect the tensile strength and rigidity of the weld joint.
Taguchi Method for 304 Stainless Steel Nd-YAG Laser Beam Welding
Authors: Kuo Tsung Yuan , Lin Huan Chang , Liao Tze Yuan , Kuo Chih Hua , Han Tsung Jen
Published: July 2011

This study uses the relative tensile strength of weld and base metal as a quality factor for the Taguchi analysis in laser beam welding of stainless steel. The result shows that the optimum process parameters can be obtained reasonably even in the case of the base metals have a larger property variation or the operation setup is not controlled well properly.
Study on a Self-Diverting Acid System for Well Stimulation Based on Novel Visco-Elastic Surfactant
Authors: Zhou Fu Jian , Xiong Chun Ming , Shi Yang , Yang Xian You , Lian Sheng Jiang , Liu Xiong Fei , Li Xiong Dong
Published: July 2011

Carbonate reservoir, widely distributed in china, is an important resource of oil and gas. Most of carbonate reservoir are very tight and need to be stimulated to increase the permeability for the flowing of oil/gas. Acid treatment is a kind of stimulation. However, the ordinary acid system cannot stimulate carbonate reservoir effectively because of the heterogeneity among formations. Based on a novel visco-elastic surfactant, this paper develops a self-diverting acid system (DCA) for carbonate formations. This system had been applied in the treatment of carbonate reservoirs successfully. Experiments studying the diverting mechanism had been conducted with HTHP Rheometer, parallel core flooding system and MRI Scanning system. The results indicate that: the viscosity of reacted acid can reach to 200 times higher than that of fresh acid. The injecting pressure of DCA is 20 times higher than that of ordinary acid (HCl) during the parallel core flooding experiment. MRI scanning images of the cores after acid flooding show that DCA can stimulate the cores with middle and low permeability more effectively. In middle and low permeability cores, the length of wormhole created by DCA is 4-8 times longer than that created by ordinary acid. At the same time, the relationship between flooding pressure and core permeability is also studied. This paper reveals the diverting mechanism of DCA through these experiments.
Laboratory Study on Low Temperature Rapid Strength Cement Slurry
Authors: Li Zao Yuan , Zhou Chao , Li Jia Ying , Wu Qi Bing , Guo Xiao Yang
Published: July 2011

In the construction of the conductor casing and surface casing cementing, due to the low bottom hole circulating temperature(BHCT), the compressing strength of oil well cement development slowly, waiting on cement(WOC)need a long time, an increase of drilling costs, could easily lead to annular gas channeling, and have a bad effect on cement job quality and safety of operations. For the type of current domestic oil well cement early strength agent are few, The effective of some early strength agent are not satisfied. Some are Corrosive to the casing, and have a great influence on slurry rheology and other issues. Laboratory selected a new compound early strength agent with on chlorine and containing crystal seed.The thickening time, compressive strength, settlement stability properties, anti-gas channeling ability and other parameters of the slurry are tested. The results show that: There are some advantages of the cement slurry like right-angle-set, low temperature rapid strength, excellent settlement stability properties, and strong ability of anti-gas channeling and form a low density cement slurry which density range from 1.30 to 1.90g/cm3, it provide a reliable guarantee to cementing operation in shallow well with low-temperature under the different reservoir pressure.
3D Dynamic Analysis of a 270m Concrete Faced Rockfill Dam
Authors: Sun Da Wei , Wang Kang Ping , Zhang Guo Dong , Yao Hui Qin
Published: July 2011

3D finite element mesh for a 270m high CFRD was generated with advanced grid discretion technology. Adopting EI-Centro seismic wave with maximum horizontal acceleration 0.277g, dynamic response of this 270m high concrete faced rockfill dam was obtained by equivalent linearization method. Using residual strain model, the permanent deformation of the dam was obtained. Calculation results showed that the maximum acceleration and displacement of dam body, dynamic stress of face slab and deformation of joints are all within normal range. Therefore, the safety of dam would be guaranteed when it is subjected to 7 degree earthquake.
Cytotoxicity of Single-Walled Carbon Nanotubes with Human Ocular Cells
Authors: Yan Lu , Zhang Shu , Zeng Chao , Xue Yu Hua , Zhou Zhong Lou , Lu Fan , Chen Hao , Qu Jia , Dai Li Ming , Liu Yong
Published: July 2011

In this paper, we report the first study on cytotoxicity of single-walled carbon nanotubes (SWCNTs) and theirs derivatives with human ocular cells, such as ARPE-19 cells. In particular, we have systematically investigated the cytotoxicity of SWCNTs, hydroxyl-functionalized SWCNTs (SWCNT-OH), and carboxylic functionalized SWCNTs (SWCNT-COOH) with ARPE-19 cells by examining their influence on the cell morphology, viability, oxidative stress, membrane integrity and apoptosis. To this end, various methods, including optical micrography, CCK-8 assay, LDH assay, SOD assay, TEM and Apoptosis assay, have been used in this study. Our results suggest that SWCNTs could cause an decrease in the cell survival rate, changes in the SOD level, membrane integrity and cell apoptosis, indicating a high toxicity to ARPE-19 cells. However, chemical functionalization of SWCNTs with –OH and –COOH groups was found to significantly improve the biocompatibility of SWCNTs. Among the SWCNTs and their derivatives studied in this work, the SWCNT-COOH exhibits the best biocompatibility to ARPE-19 cells.
Effect of Pulse Electric Discharging on the Directional Solidification Structure of Pure Aluminum
Authors: Ren Hai Guo , Su Jian , Zhao Zhi Long , Ai Chang Hui
Published: July 2011

The effect of the pulse electric discharging (PED) on the solidification structure of pure aluminum during the directional solidification was investigated. Experimental results showed that fine microstructures were generated by exerting PED, and the cellular spacing decreased greatly with increasing current density. The effect of pulse electric discharge on the temperature gradient in front of the solid-liquid interface was analyzed, the cellular spacing was measured and expressed as the function of solidification processing parameter by using a nonlinear regression analysis, and the refinement mechanism using the PED treatment was also discussed.
Prediction of Orthotropic Mechanical Behaviors of Hot-Pressing Weft-Knitted Flax/PP Composites
Authors: Shen Min , Wang Wen Liang , Xu Rui , Tong Jing Wei , Li Hong Xia
Published: July 2011

The orthotropic mechanical behaviors of weft-knitted flax fiber fabric reinforced polypropylene (PP) composites, which were produced by hot pressing of knit layers composed of a commingled yarn with a flax fiber content of 50vol.%, are investigated in both meso- and macro-scales. In meso-scale, the repeating unit cell (RUC) finite element (FE) model is developed, in which impregnated yarns are assumed to be isotropic elastic while the matrix is modeled as an elastoplastic, isotropic solid. Then, stress-strain curves of the RUC are simulated for its elastoplastic orthotropic parameters. Finally, in macro-scale of its specimen, the tensile behavior of the composite laminates with six parallel plies is simulated by means of 3D elastoplastic FE method. The applicability and limitation of this model have been discussed.
Preparation of Ag Nanoparticles by Particulate Radiation of Pulsed Electron Beam
Authors: Uhm Young Rang , Rhee Chang Kyu , Sokovnin Sergei , Balezin M.E
Published: July 2011

Nano metal Ag nanoparticles were synthesized by pulse electron beam (e-beam) irradiation at room temperature and the atmospheric pressure. The staring materials were AgNO3, toluene, ethanol and ethylene glycol. The ethanol and ethylene glycol plays a role of prohibiting agglomeration of metal ions. Energy dispersive X-ray spectrometer (EDX) was used to characterize the elements. Transmission electron microscopy (TEM) images were used to determine the shape and diameter. The time of e-beam irradiation affect to the particle size and aggregation. The average particle size was 10 nm and 30 nm for the dose time of 1 and 5 min, respectively. The shape of particles were changed from spherical to disk-like to coral-like, with increasing the irradiation time from 1 to 5 to 10 min.
Aqueous Synthesis of Highly Luminescent CdTe/CdS/ZnS Core-Shell-Shell Quantum Dots with Biocompatibility
Authors: Huang Huai Qing , Liu Jin Ling , Han Bao Fu , Xu Shu Kun
Published: July 2011

CdTe/CdS/ZnS core-shell-shell (CSS) quantum dots (QDs) were synthesized in aqueous solution via water-bathing combined hydrothermal method using L-cysteine (L-Cys) as a stabilizer. This method possesses both the advantages of water-bathing and hydrothermal methods, and thus can prepare CSS QDs with markedly reduced synthesis time than previously reported methods. The as-prepared QDs display a higher fluorescent intensity than bare CdTe or CdTe/CdS. After co-cultured with yeast at different growth phase, the as-prepared L-Cys capped CdTe/CdS/ZnS QDs showed much less toxicity than the other CdTe or CdTe/CdS QDs. Our results demonstrate that the CSS QD would have a promising potential in fields of bio-labeling and cell imaging.
Investigation of the Curing Residual Stress in Gr/Epoxy Laminated Composites by Using Embedded Fiber Bragg Grating Sensor
Authors: Chiang Chia Chin
Published: July 2011

The curing monitoring of the polymeric composite materials has attracted wide interests recently. In order to improve the performance of Gr/Epoxy composites, monitoring the curing process is a demand, especially for the characterization of residual stress after manufacture. The main objective of current research is to explore the application potential of embedded fiber Bragg grating (FBG) to monitor the characterization of the curing process in a Graphite/Epoxy composite. The changes in the shape of the optical spectra, intensity attenuation as well as wavelength shifts in the optical fiber sensors were utilized to assess the curing development and residual stress measurement. The residual stress yielding during curing process was analyzed and presented systematically in this paper.
A Novel Carbon Quantum Dots-Ionic Liquid Hybrid with Strong Photoluminescence
Authors: Zhang Qing Guo , Shi Li Min , Zhang Cheng Li , Wang Shuang Long
Published: July 2011

A new fluorescent Carbon Quantum Dots-Ionic Liquid (CQDIL) hybrid was synthesized by simple method. This CQDIL exhibited extraordinary stability and enhanced photoluminescence .
Electromagnetic Bandgap Structure by Low Temperature Co-Fired Ceramics Technology
Authors: Zhang Xiao Qing , Li Bo , Pang Xin Feng , Sun Jing Bo , Wu Jun , Chen Bing Yang , Guo Hai , Zhou Ji , Li Long Tu
Published: July 2011

A EBG（Electromagnetic Bandgap） structure was prepared based on the theory of the high impedance surface photonic crystal and the HFSS emulating results. The measurement result showed that the bandgap of the EBG structure was in the Ultra Wideband range. The designed structure was fabricated by a method of low temperature co-fired ceramics technology（LTCC） using ceramics as the matrix and silver as the coils. The micro-structure was analyzed by microscope and scanning electron microscope which showed that these two kinds of materials were well connected. A bandgap between 4GHz~5.5GHz was found by the Vector Network Analyzer which was accord to the emulation.
Preparation and Performance of Infrared Radiation Ceramic Using Blast Furnace Dust
Authors: Yang Jin Ping , Wei Heng Yong , Lu Xiang , Li Peng
Published: July 2011

Blast furnace dust was used to synthesize ferrite, which could not only increase the economic value of mineral resources, but also reduce the production cost. High infrared radiation ceramic was prepared using cordierite and ferrite FeMnCuO4 by high temperature solid state sintering method. The phase composition and the microstructure of the sample were investigated using XRD analysis and SEM. The infrared emissivity of the infrared radiation ceramic was 0.88. Ferrite and cordierite form replacement type sosoloid at high temperature, which can greatly improve the infrared radiation property of ceramic.
Research on Morphology Control of PVA/Na-MMT Composite During Preparation
Authors: Li Zhen , Yang Chang Hui , Yang Kui , Wang Chong
Published: July 2011

The morphology of PVA/Na-MMT composite under different freezing technology conditions was studied. Inlfuence of PVA content and frozen conditions on microstructure and formation mechanism of PVA/Na-MMT composite materials were analyzed using scanning electron microscopy(SEM). The experiment results show that the structure of freeze-dried PVA/Na-MMT composite is influenced by both frozen technology and PVA dosage. PVA/Na-MMT composite frozen in Low-temperature refrigerator presented honeycomb-like structure when PVA dosage was 1%, and when the dosage of PVA was 2%, 3%, 4% respectively, the composite exposed wrinkle superposition structure. In liquid nitrogen frozen, Fiber-like structure of PVA/Na-MMT composite was obtained when the PVA content more than 3%.
Design of an Eco-Power Automobile Body Made from Green Composite and its Structural Optimization in FEA
Authors: Luan Kun , Sun Bao Zhong , Gu Bo Hong , Zhang Jia Jin
Published: July 2011

Ramie (Boehmeria nivea) is a kind of natural fiber that has good mechanical and environmental friendly properties. The fabric woven by ramie yarns shows excellent dimensional stability. Polypropylene (PP) was used as matrix for its recyclable and thermoplastic properties. PP is the widely used thermoplastics for composite and currently it is very common in building, construction, furniture and automotive products. Since the eco-power automobile body was designed for light-weight and low fuel consumption, there seems to be high potential application to automobile industry for ramie-PP composite. Therefore, in this paper, we developed a constitution of fabric to form stable structure reinforcement. The reinforcement and PP particles were treated in vulcanizer by thermo-compression technology. The fundamental mechanical properties of the composite were tested for finite element analysis (FEA). An eco-power automobile body was designed in Pro/E® Wildfire 5.0 and transferred to Finite Element Analysis Software for material and structural simulation analysis. Structural improvement and sizing optimization of the eco-power automobile body model were simulated to judge the material application and its structure effectiveness.
Experimental Study of Restraining Frost Formation on Hydrophilic Surface under Natural Convection Conditions
Authors: Gou Yu Jun , Zhong Xiao Hui , Liu Zhong Liang
Published: July 2011

A series of tests was carried out on the hydrophilic surface that was made of a new hydrophilic anti-frosting paint with the character of restraining frost growth. Compared the result with prevenient hydrophilic paint, the new paint presented in this paper has better effect on retarding frost formation under low and high relative humidity environment and the thickness of the coat made by the new paint was only 0.06mm, that was only 20 percentage of film thickness of prevenient paint.
Hydraulic System Simulation of Heavy Horizontal Directional Drilling Head
Authors: Fei Ye , Cong Shu Yang , Bian Bin
Published: July 2011

According to the features of heavy horizontal directional drill hydraulic system, power head hydraulic system which is the main working mechanism of the 280t horizontal directional drilling is modeled and simulated base on Amesim. On that basis, we adjust working characteristics of this model and make the point of view that feedback control parameters which is the hydraulic system of heavy drill should be adjusted according to the soil conditions. So that it can enhance the utilization rate of the machine power and drilling efficiency in different operating modes.
Effect of Temperature on Microstructure and Mechanical Properties of Spray Forming Al-8.5Fe-1.3V-1.7Si Alloys
Authors: Zhang Rong Hua , Zhu Bao Hong , Zhang Yong An , Wu Biao
Published: July 2011

Heat-resistant Al-8.5Fe-1.3V-1.7Si alloys were prepared by spray forming technique. The effect of temperature on microstructure and mechanical properties of the alloys was studied by optical microscope(OM), transmission electron microscope(TEM) with energy dispersive spectrometer(EDS), X-ray diffraction(XRD), differential scanning calorimeter(DSC) in this paper. The research results show that the microstructure of the material doesn’t change obviously after being hold for 3 hours at 420°C temperature. When the temperature is over 420°C, the second coarse phases are found in the alloy. The study on the microstructure of the alloy exposed at 400°C for 100 hours shows that the alloy has excellent high temperature stability. And the main second phase in the alloy is spherical a-Al12(Fe,V)3Si, with a little other phases such as Al13Fe4, Al6Fe, Al9FeSi3 and so on.
Melting,Crystallization and Thermal Degradation of Fly Ash/Lldpe Blends
Authors: Cao Xin Xin , Gao Jun Gang , Hu Lei Yang , Dai Xin , He Xiao Fang , Dai Ya Hui
Published: July 2011

Fly ash/LLDPE composite material was obtained by using the molten blending. The melting, crystallization and thermal degradation of fly ash/LLDPE blends were investigated. The results indicate that the addition of fly ash increases the molten peak of blends, which shows that fly ash has the function to prevent heat transfer. The addition of the powder of fly ash has prevented the regular spread of LLDPE molecue and has impact on the regular spread when the segmer crystallizes, spreads and moves, which slows LLDPE's crystallization rate, and has an inhibitory action to LLDPE crystalloid's growth; the starting degradation tempreture (T0, 5%weight loss ) of complex system is lower than that of pure LLDPE, but the tempreture at maximum egradation rate increases with the quantity of fly ash increasing.
Synthesis of MgAl2O4 Spinel-Corundum Composite with Waste Refractory
Authors: Bi Wan Li
Published: July 2011

Magnesia-alumina spinel-corundum composite was prepared with waste slide plate and waste magnesia carbon brick. The magnesia-alumina spinel-corundum composites were investigated with XRD, SEM, DSC/TG. With the increasing amount of the waste slide plate used and increasing of synthesis temperature, the bulk density of the sample increase and the apparent porosity decrease, but the crystallinity of the sample decrease and the magnesia-alumina spinel phase increases. The obtained composite contained 72 wt % spinel, corundum 26 wt %. Primary and secondary phase were bonded by glass phase. The results shows that it is feasible to synthesis magnesia-alumina spinel-corundum material with waste slide plate and waste magnesia carbon brick.
The Effects of Bi2O3 Doping on the Electrical Characteristics of SnO2 Based Varistors
Authors: Fan Ji Wei , Zhang Zhen Guo , Li Xiao Peng , Liu Xiang Yang , Li Tian
Published: July 2011

Bi2O3 is an important additive in the composition of ZnO varistors. However, the effect of Bi2O3 on novel SnO2 based varistors is still unclear. This paper reports the nonlinear electrical characteristics of (98.95-x)mol%SnO2-0.5mol%CoO-0.05mol%Nb2O5- xmol% Bi2O3 (x = 0, 0.05, 0.1, 0.5 mol%) system, and the influence of sintering temperature is also investigated. The addition of Bi2O3 can improve the electrical nonlinearity of SnO2-CoO-Ta2O5 based varistors, this may be due to the higher barrier height and barrier voltage. The optimum Bi2O3 doping level is between 0.1-0.5mol% and the optimum sintering temperature is 1350°C.
Preparation and Up-Conversion Luminescence of Yb3+ and Er3+ Co-Doped BaF2 Phosphor
Authors: Cheng Li Qun , Cheng Guang , Dong Rui , Zhang Xi Yan
Published: July 2011

Yb3+and Er3+ co-doped BaF2 phosphors were prepared by high temperature solid reaction method. Effects of mol content ratios of Yb3+ ion to Er3+ion (CYb3+∶CEr3+) and charge compensation agent Na2SiF6 contents on the up-conversion luminescence of the samples were studied. The XRD and PL were carried out to investigate the phases and the up-conversion luminescence. Three up-conversion emissions were observed with peaks at 460nm, 548nm and 660nm respectively. The up-conversion luminescence intensity increases firstly, and then decreases with increasing CYb3+∶CEr3+ and the optimal ratio was found to be at 12:2 with fixed Er3+ contents 2mol%. The up-conversion emission intensity was enhanced by introducing Na2SiF6 as the charge compensation agents and its optimal content was found to be 2mol%.
The Influence of Water Content on the Morphology and Magnetic Properties of Nickel Nanoparticles Prepared in Reverse Microemulsion
Authors: Zhou Qiong , Hu Yin Chun , Ma Yu Liang , Weng Yong Ji
Published: July 2011

Magnetic nickel nanoparticles are prepared by NaBH4 reducing agent in AOT reverse microemulsion, the influence of water content on the morphology and magnetic properties of nickel nanoparticles are investigated by TEM study, size distribution, XRD characterization and magnetization curves. The results show that spherical and polydispered particles are obtained in microemulsion. The dimension and polydispersity of particles increased with the increasing of water content. Magnetization curves clearly indicate a ferromagnetic behavior with high coercivity values. At water content of W0=41.7, the product has a high saturated magnetization 70.68 emu/g with its residual magnetizations 28.02 emu/g, higher than the sample obtained at water content of W0=13.9.
Morphological and Adsorptive Characteristics of Hydrogen Sulphide on Zinc Oxide Nanoparticles Modified SBA-15
Authors: Wang Xiao Hui , Ding Hui
Published: July 2011

Using microwave-assisted solid-state method, a series of zinc oxide-modified mesoporous SBA-15 materials were synthesized. The desulphurization test with a gas mixture containing 0.1 vol % hydrogen sulfide was carried out on these materials. Chemicals before and after the desulphurization test were analyzed using nitrogen adsorption, XRD, EDS, TEM, ICP and other standard methods. The results suggest that zinc oxide modification can accelerate the transformation from a mesoporous to a zeolite phase. The different zinc loading results in different zinc-phase dispersions on the materials.
Study on Preparation of Nano-Silicon Dioxide and the Influencing Factors of Particle Size Growth
Authors: Wang Li , Meng De Qin , Zhuang Chun Yan
Published: July 2011

Nano-silica sol with average particle size of 20-30nm has been prepared by the hydrolyzation method of elemental silicon powder with addition of MD-01. The influencing factors of nano-particle size growth such as reaction time, reaction temperature, dosages of sodium hydroxide and additive MD-01 were investigated in this paper, and the forming process of nano-silicon dioxide was also analysed.
Static Design Based on Hierarchy Optimization Associating Materials and Structures
Authors: Liu Yuan Dong , Yin Yi Hui , Lu Ying Chun
Published: July 2011

In order to study the comparison of material design, structure design and integrated design about the porous material, a concurrent topology optimization design model associating materials and structures with periodical microstructures is presented. The sensitivity formulae of hierarchy optimization are given based on the integrated design model and related numerical experiments were carried out. The applicability of hierarchy optimization is discussed and their advantage and disadvantage are analyzed through numerical examples which provide some useful opinions about the porous material design.
Optimization of Typical Grinding Model and the Simulation of Grinding Process Numerical
Authors: Wang Guang Hui , Chen Xue , Wang Chuan Zhen
Published: July 2011

Based on the actual conditions during industrial production, this paper proposes an improvement method and solution to the typical grinding process model and derives a mathematical model of grinding process that’s suitable for industrial production. Sampling analysis and laboratory experiments of the production process were conducted, the derived model was tested, and the results show that particle size distribution curve obtained from the improved model is similar to the actual product, which means that the improved model can be applied to simulate industrial grinding process.
Conductive Ink and Applications in Printing Antenna of RFID Tag
Authors: Hu Xu Wei , Li Lu Hai , Zhao Sheng Min , Leng Xian
Published: July 2011

Antenna of RFID tag is used to spread frequency signals and build wireless connection between the tag and reader. High cost, low production speed and environment pollution exist in the traditional methods of manufacturing antenna. In order to overcome the disadvantages above, the method of printing antenna with conductive ink is being widely researched. So, conductive ink gets more and more attention. In order to study the performances of conductive ink better, conduction mechanism of conductive ink are mainly discussed. The requirements of conductive ink to print antenna are described. The present status of conductive ink in printing antenna is introduced, and research directions in future are also predicted.
The Study of TiO2 Whiskers Prepared by Melt Phase-Splitting Method and their Photocatalytic Properties
Authors: Gao Shui Jing , Zhang Wen Li , Hou Gui Qin
Published: July 2011

This paper studied the preparation of TiO2 whisker with melt phase-splitting method, which used tataniferous blast-furnance as the main raw materrial. XRD and SEM were used to research the phase and morphology of the sample, and by the same time, the photocatalytic properties of TiO2 crystal-beards was tested.The result have shown:the size of TiO2 crystal-beards was sub-micron rank, the crystal type wasβ-TiO2 of orthorhombic high-pressure phase. The generation of TiO2 crystal-beards were effected mainly by the content of Na2O and TiO2, and the heat treatment temperature. The sample had certain photocatalytic properties and the highest photocatalytic efficiency was 56%.
Preparation and Performance of Radiation Grafted Poly(methyl methacrylate)-Graft-Polyimide Pervaporation Membranes for Thiophene/Hydrocarbon Separation
Authors: Lin Li Gang
Published: July 2011

Radiation grafted poly(methyl methacrylate)-graft-polyimide membranes were prepared for thiophene/hydrocarbon separation. The effects of various grafting conditions such as reaction time, monomer concentration, diluting solvent and initiator amount on the grafting level were investigated. ATR-IR analyses verified the grafting process. Prepared graft modified membranes showed thiophene permselectivity for thiophene/hydrocarbon mixture on pervaporation. At 3.7 % of grafting rate, flux (1.79kg/(m2·h)) and sulfur enrichment factor (3.81) were obtained with 400μg/g feed sulfur content level.
Experimental Research on the Magnetic Field Sensitive Polymeric Actuator
Authors: Xia Chun Lin , Wu Yang Fang , Lu Qian Qian
Published: July 2011

Using domestic MFSP membrane as a medium of energy conversion, a kind of MFSP actuator was designed. The dedicated test equipment was constructed for experimental research, and the experimental results were given. The strip and circular MSFP membrane were analyzed qualitatively to obtain the deformation characteristics of membrane by finite element analysis software.
Study on the Methods Evaluating the Stability of a New Type of Energetic Material
Authors: Lu Gui E , Jiang Jin Yong , Chang Wen Ping
Published: July 2011

171 propellant is a new type of energetic material, extensive research indicates that the traditional methods evaluating the stability of this propellant are unsuitable. So in this article, the stability of this material was studied by aging test, methyl-violet test and gas phase chromatography test. The results show that gas phase chromatography test is feasible for evaluating the stability of this material, but methyl-violet test is unsuitable.
Generalized Regression Neural Network Cargo Flow Forecast Model in Logistics Park Based on Radial Basis Function
Authors: Zhang Qin , Liang Yin Kui , Yu Wen Xia , Zhang Qiang
Published: July 2011

According to cargo flow, the strength of the logistics supply need could be predicted. Improving predicting accuracy can provide a scientific basis for the construction and operation on the logistics park. Generalized regression neural network model of logistics park is introduced under the impact of supply chain management, and designing steps about the prediction model is given. And the prediction model predicts Jinan Gaijiagou Logistics Park well.
Influence of the PH Value of Comb-Shaped Polymer on the Adsorption between the Polymer and Ca2+ Ions
Authors: Duan Guo Rong , Wang Xin , Huang Guo Hong , Gong Ying
Published: July 2011

Comb-shaped hyper-branched polycarboxylate admixture polymers, both the water-reducing-type JS and slump-retaining-type BT, were prepared, and their adsorption characteristics with Ca2+ ions were studied by conductivity loss experiments. The results indicated that, both the water-reducing-type JS and slump-retaining-type BT, would generate certain electrical conductivity loss in CaCl2 aqueous solutions, suggesting that there was some close adsorption between the polymer and Ca2+ ions, the adsorption was closely related with the pH value of the polymers, the neutral and alkaline samples neutralized by NaOH show an higher adsorption than that non-neutralized. The adsorption was achieved by the strong interaction between carboxylic acid groups in the polymer backbones and Ca2+ ions (rather than Cl- ions)
Applied Research on Contractive Rate Inspecting Testing Mould of Pressure Casting Alloy
Authors: Liu Geng Wu
Published: July 2011

As we know , the materials will swell and contract when it is heated or cooled . A kind of method for mastery the real contractive rate of alloy was bring forward through researching the contractive rate of alloy. Using the method a inspecting testing mould of alloy was designed , and the real contractive rate was mastered by the mould . And this provides the reliable contract date for the design of mould cavity dimension , and reduces the work of mould repair , and also save a lot of money and labor.
Progress in Research on Mo-MoSi2 Functionally Gradient Material
Authors: Zhang Ying Yi , Li Yun Gang , Chen Jin , Tian Ying
Published: July 2011

By summarizing the research and development status in recent years, this thesis especially introduces the preparation method and enhancement mechanism of the functionally gradient material of Mo-MoSi2. Results of experiments show that: alloying and compounding can significantly improve the room-temperature brittleness and high temperature strength；and the application of Chemical Vapor Deposition (CVD) method in the preparation of Mo-MoSi2 multiphase anti-oxidation coating, has obvious advantages in that it reduces cracking and improves the coating quality. Finally, the developing trend of Mo-MoSi2 and its prospected difficulties and hot issues are also pointed out.
Effect of Cd on Microstructure and Damping Capacities of Mg-Zr PM Alloy
Authors: Liu Zi Li , Zhou Gui Bin , Shen Ping , Liu Xi Qin , Wang Huai Tao
Published: July 2011

Mg-1.5%Zr-x%Cd alloys (x=0, 0.5, 1.0, 1.5, mass%) were prepared by PM (powder metallurgy) technology, and the microstructure, mechanical properties and damping capacities of the alloys were researched by OM, three-point bending test and DMA, etc. The results show that the microstructure becomes into strip or block shaped morphology, granular particles Zr appear at grain boundaries or inside grains, and the grains are more refined with the increase of Cd additions. Micro-hardness(HV) and bending strength(σbb) of the alloys increase with increasing addition of Cd. Damping capacities of the Mg-1.5%Zr-x%Cd alloys improves with Cd additions, and increase with the temperature. The damping peak temperature increases with increasing frequencies, showing the characteristic of relaxation damping.
Experiment on Thermal Conduction of Compacted Bentonite Blocks
Authors: Ren Guang Yuan , Chen Quan Shui , Zheng Ju Gong
Published: July 2011

Bentonite has been regarded as buffer material for high-level radioactive waste (HLW) disposal all over the world, plenty of decay heat released from HLW is conducted through butter material, therefore, thermal conduction of compacted bentonite is very important. This study presents compacted GMZ Na-bentonite(with 8.9% water content, 1.8 g/cm3 compacting density) temperature and relative humidity change pattern with time and position variation taking intermittent warming method and using thermal conduction equipment, it is designed according to the conceptual model of HLW geological disposal repository. The results show that the temperature achieve a balance quickly, the temperature of compacted bentonite block which the distance is 2 cm to heat source reaches the first about 55°C balance stage after about 40 hours, radial temperature gradient (GT) increases with the temperature rising, average of GT during the first stage is 0.85°C/cm, average of GT during the second balance stage about 82°C is 1.57°C/cm; Affected by temperature, relative humidity increase rapidly at the beginning with the temperature rising, when the temperature reaches equilibrium, the relative humidity decreases slowly, the higher temperature of the compacted bentonite block is, the lower relative humidity is, the radial gradient of relative humidity (GHR) increase with heating time, average of GHR during the first stage about 55 °C is 1.32%/cm, average of GHR during the second stage about 82°C is 1.89 %/cm.
SHS and Properties of Perovskite La0.7Sr0.3MnO3 Powders by Using Dual Oxidants
Authors: Yan Xue Min , Mi Yuan Zhu , Xiong Lin
Published: July 2011

Self-propagating High-temperature Synthesis (SHS) was used to prepare complex oxide La0.7Sr0.3MnO3, which is used as the cathode in solid oxide fuel cells (SOFCs). Experiments show that La0.7Sr0.3MnO3 can be prepared via SHS under moderate conditions from a mixture of La2O3-SrO2-Mn-NaClO4-KMnO4，using NaClO4-KMnO4 as dual oxidants. The proper addition of the second phase oxidant KMnO4 makes the combustion wave movement stable. The product powders have an average particle size of 1-2μm and the particles are small aggregate. Pellets were sintered at 900 °C, 30 MPa for 10 min by spark plasma sinter (SPS). The electrical conductivity of sintered sample was 170 S•cm-1 at 1000 °C in air.
The Research on the Tribological Properties of C/C Composites
Authors: Wang Wen Xia
Published: July 2011

The mechanical and tribological behaviors of the carbon/carbon (C/C) composites were evaluated by three-point bending and sliding wear tests. The effect of carbon fiber content on their mechanical behavior was also investigated. To produce the C/C composites, the precursor was introduced to the preforms by impregnating with phenolic solution. The C/C preforms were densified by thermal gradient chemical vapor infiltration. Results indicated that, the C/C composites show excellent mechanical and tribological properties. A kind of high performance brake materials was obtained.
Developing an Iron-Carbon Nitride Complex as Photocatalyst with Response to Visible Light
Authors: Yang Jun Cheng , Guo Yong , Luo Lei Lei , Kong Fei , Chu Sheng , Wang Ying , Zou Zhi Gang
Published: July 2011

In this article, we synthesized a porphyran-like complex composed of iron chloride and carbon nitride polymer (CNP) as a new photocatalyst with visible light response. Several chemical reactions were carried out to confirm it to be a complex, while FTIR, XRD, XRF were used to further prove its structure. According to the UV-Visible diffuse reflectance spectra, the absorption had been extended to visible light region. Photodegradation of methyl orange (MO) on this novel Fe-CNP complex confirmed it possesses high activity under visible light irradiation.
Synthesis of Magnesium Borate (Mg2B2O5) Whisker by Flux Method
Authors: Wang Li Cong , Zhang Yu Shan , Wang Yu Qi , Cao Dong Mei , Huang Xi Ping , Liu Yuan
Published: July 2011

Magnesium borate (Mg2B2O5) whisker was successfully synthesized by high temperature flux method using Magnesium chloride, boric acid, sodium hydroxide and sodium chloride as raw materials.The as-prepared product was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy(SEM), Transmission Electron Microscope (TEM) and X-Ray Photoelectron Spectrometry (XPS). The results showed that the as-prepared sample had triclinic structure and consisted of whisker-like particles with an average diameter about 1.25 μm and length up to 40μm. XPS results confirmed that the molar ratio of each atom agreed with the stoichiometric composition of Mg2B2O5. The growth mechanism was briefly discussed.
Synthesis of Bis(2, 4-Dihydro-2H-3-(4-N-Maleimido) Phenyl -1, 3-Benzoxazine)Isopropane
Authors: Tao Guo , Xu You Hui , Yang Gang
Published: July 2011

The novel bis(2, 4-dihydro-2H-3-(4-N-maleimido) phenyl-1, 3-benzoxazine)isopropane (BMIPBI) was synthesized from maleic anhydride, p-nitroaniline, formaldehyde and 2,2-bis(4-hydr -oxyphenyl)propane by a few steps reactions via the N-(4-nitrophenyl)maleimide(NPMI), N-(4-amin -ophenyl)maleimide(APMI),1,3,5-three(4-(maleimido)phenyl)-1,3,5-triazine(TMIPT)intermediate production. The chemical structures of BMIPBI were confirmed by 1H-NMR, FT-IR and EA. The results show that the production was the target object BMIPBI. The synthesized condition had been studied too. The BMIPBI was a loosened yellow solid and the yield of product was 58.8%.
Bioactivity of TiO2/Ti Composite Membrane with Different Crystral Phase
Authors: Zhan Min Jing , Li Gang , Wei Qiang , Cui Hua Lei , Lin Ling
Published: July 2011

The bioactivity of TiO2/Ti composite membrane with different crystral phase was studied by the culture of hypothalamic neurons in vitro for the application of immunoisolation. The kind of membrane supported on porous Ti has been prepared by sol-gel technique and the crystral phase was controlled by different sintering temperature. The crystral phase of TiO2, morphology and function of hypothalamic neurons were observed by X-ray diffraction (XRD), enzyme-linked immunosorbent assay (ELISA) and environmental sanning electron microscope (ESEM). The results showed that neurons could attach well to the TiO2 /Ti composite membranes with rutile phase and became bipolar. The long axon and dendrite with dendrite spine were interconnected by synapses. A complicated neural net were easily observed. The secretory level of β-endorphine remained between 51.3pmol/L and 40.6pmol/L all the times. However, the neurons in membranes with anatase were transformed into an umbilicate structure without processes. The secretory function of neurons also died out in 4 days. These results indicated that the TiO2 /Ti composite membranes with rutile phase were propitious to the neuron’s growth than the composite membranes with anatase phase and could be used as immunoisolation membranes.
Experimental Study on Seismic Performance of HRB400 Reinforced Concrete Columns under Cyclic Loading
Authors: Han Yan , Guan Hong Cheng , Li Zhen
Published: July 2011

Through experimental study on three HRB400 steel bar reinforced concrete columns subjected to low cyclic reversed loading, the failure patterns, hysteretic curves and skeleton curves were obtained. The influence of longitudinal high-strength reinforcement ratio upon the hysteretic characteristics, ductile behavior and ability of energy dissipation were analyzed. The results show that the main failure pattern was bending failure; and with the increscent of the longitudinal high-strength reinforcing steel bar ratio, the columns can endure larger seismic loads and displacement; the seismic performance of the whole reinforced concrete columns can be effectively improved by arranging reasonable high-strength steel bars.
Control of Electronic Properties of Organic Semiconductor
Authors: Tan Ke Jie , Zhang Ke Ke , Liang Shu Qin , Kan Wai Hoong , Mhaisalkar Subodh G , Kloc Christian
Published: July 2011

The electronic properties of organic field effect transistors limit the efficiency of integrated circuits build on basis of printed organic semiconductors. In order to control the mobility of high efficient semiconductors, like rubrene, tetracene, tetracyanoquinodimethane (TCNQ), copper phthalocyanine and many others, single-crystal field-effect transistors have been prepared on surfaces of single crystals and characteristics have been measured. The highest mobility has been measured on rubrene single crystals. The mobility of as-grown crystals measured by air-gap field effect transistor is in the range of 10 cm2/Vs but falls below 1 cm2/Vs during reduction. It was observed that the measured mobility depends on the dielectric used for field effect transistors.
Inhibition of the Expansion of CFBC Ash
Authors: Song Yuan Ming , Wang Bo , Xu Hui Zhong , Wang Zhi Juan
Published: July 2011

The destructive expansion of CFBC ash is the bottleneck problem for its utilization in building materials. The addition of chemical substances and autoclave curing were used to inhibit the expansion in the paper. The results show that the addition of 1% CaCl2 or 1% Na2CO3 can decrease the 28 d linear expansion ratio of CFBC ash-water mortars by about 19%, with no disadvantage influence on the compressive strength. Moreover, the linear expansion ratio of CFBC ash-clinker-water pastes was below 5×10-4 after autoclave curing. The work confirms that the expansion of CFBC ash can be inhibited effectively by the way of autoclave curing.
Experimental Research on Road Performance of Natural Asphalt Modified Asphalt Mixtures
Authors: Fan Liang , Song Xiao Jin , Zhang Yu Zhen
Published: July 2011

This report mainly evaluated the pavement performance of natural asphalt from Albania. Firstly, base asphalts were processed with natural asphalt by “wet method” modification technique to obtain modified asphalt; and mixture are produced with these modified asphalt binders, and then high temperature performance and moisture stability properties are evaluated by some standard methods. Analysis shows that this natural asphalt can remarkably improve the high temperature and moisture stabilities of asphalt mixture, and own cost-effective advantage.
Thermal Resistance and Heat Dissipation of LED PCB with Thermal Vias
Authors: Shin Hyung Won , Lee Hyo Soo , Jung Seung Boo
Published: July 2011

Light Emitting Diode (LED) has been already familiar that is used as lighting sources of general electronic devices and various displays. LED has many advantages such as long life, low power consumption and high reliability. In the future, as alternative to fluorescent lighting, it is sure that LED in lighting products is expected to receive much attention. However, the components related with advanced LED packages or modules have been issued on the heat from LED chip. And the LED chip is still being developed to the high power devices which are generating more heat. In this study, we investigated the variation of thermal resistance in LED modules embedded with thermal via. Through the analysis of thermal resistance with various test vehicles, we could obtain the concrete relationship between thermal resistance and structure of thermal via.
Compressive Strength of High Volume Slag Cement Concrete in High Temperature Curing
Authors: Parniani Sasan , Warid Hussin Mohd , Rahimi Mansour Farnoud
Published: July 2011

Recent consideration has been given to use of GGBFS as separate cementitious material mixed along with Portland cement in production of concrete. Problems are frequently encountered in producing good-quality concrete specially slag cement concrete in hot climates.Curing problems are exaggerated when concreting in hot weather, as a result of both higher concrete temperatures and increased rate of evaporation from the fresh mix. The disadvantage of GGBFS concretes is that they proved to be more sensitive to poor curing than OPC Therefore, special care must be taken when using this type of concrete, especially on site, where the working conditions and the application of curing are not as easy to control as in the laboratory concrete. The purpose of this paper is investigation and evaluation strength loss in slag cement concrete in poor curing situation. To carry out this aim, 72 cube specimens with three different proportion of slag are made and cured in two different conditions. And result of compressive tests compared together to determine susceptibility of GGBFS concrete in hot-dry condition.
Effects of AgSbO3 on the Piezoelectric/Dielectric Properties and Phase Transition of Li2O Doped NKN Lead-Free Piezoelectric Ceramics
Authors: Yoon Man Soon , Khansur Neamul Hayet , Lee Woong Jae , Lee Young Geun , Ur Soon Chul
Published: July 2011

The effect of AgSbO3 on the piezoelectric properties of (K0.5Na0.5)0.95Li0.05NbO3 was examined. The AgSbO3 doped KNLN samples sintered at 1050°C showed the maximum values of the sintering density of 4.56 g/cm3 compared to un-doped KNLN samples sintered at same temperature with 4.25 g/cm3. Moreover, the addition of AgSbO3 enhanced the piezoelectric and dielectric properties. Piezoelectric constant (d33), the planar electromechanical coupling factor (kp) and the relative dielectric permittivity (K33T) increased up to 230pC/N, 43.5%, 1080, respectively, with addition of AgSbO3.
Vibration Properties of Multi-Layered Graphene Sheets
Authors: Tian Mei Ling , Wang Jin Bao , He Xiao Qiao , Sun Yu Zhou
Published: July 2011

Based on an explicit formula used for describing the van der Waals (vdW) interaction between any two layers of multi-layered graphene sheets (MLGSs), the vibration properties of five- and eight-layered graphene sheets are analyzed with considering the influence of vdW interaction on the natural frequences. The present study shows that for a given combination n and m the lowest natural frequency (classical natural frequency) of a MLGSs is independent of vdW interaction, but that it is very significant for the influence of vdW interaction on the other higher frequencies (resonant frequencies). The different vibration modes, including in-phase and anti-phase ones, are given for exhibiting clearly the influence of vdW interaction.