bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Pulling Velocity on the Unidirectional Solidification Phenomenon of DZ417G Superalloy
Authors: Li Xiang Mei , Zhang Jie Yu , Liu Chun Tao , Xu Ji Fang , Ren Zhong Ming
Published: November 2010

In this study, the influence of pulling velocity on temperature field, fluid field and grain structure of a unidirectionally solidified superalloy DZ417G cylindrical casting was investigated by using a 3D cellular automaton finite element (CAFE) model within commercial software CALCOSOFT. The predictions show that temperature distribution in the casting is well in accordance with the experiment result. The solidification front and fluid field are sensitive to changes in pulling velocity. And the pulling velocity should be controlled less than 0.5 mm/s in our experiment so as to effectively decrease the grain number and mean grain deviation.
Dynamic Response of the Steel Bridge Deck Thin Surfacing due to Vehicle Load
Authors: Xu Xun Qian , Ma Ye Yuan , Wu Guo Qing , Gao Xiu Mei
Published: November 2010

Basing on the coupled vibration theory, dynamic behavior of steel bridge deck thin surfacing under rand moving vehicles is studied. A three-dimensional coupled model is carried out for the steel bridges deck thin surfacing and vehicle. A method based on modal superposition and state space technique is developed to solve dynamic response generated by vehicle-surfacing interaction. The dynamic responses of an actual steel bridge deck thin surfacing are studied. The results show that adding epoxy asphalt as a sub coat can improve interface adhesion strength, which would be designed as the interface layer of steel deck thin surfacing.
Development and Application of Dynamic Secondary Cooling Control Model for Beam Blank Casting Based on FEM
Authors: Chang Yun He , Zhang Jia Quan
Published: November 2010

A mathematical model for thermal transfer and solidification of beam blank casting has been established, which is solved by FEM. A dynamic secondary cooling control model is developed accordingly, and it can meet the need of online calculation for the entire temperature field of the beam blank casting, in which the amount of water for secondary cooling is set up and optimized by using effective casting speed and target surface temperature strategy. The dynamic secondary cooling control system is programmed by using Visual C++ 6.0 with friendly operation interface, which can be adopted not only for the online cooling control of beam blank casting but possibly for lab calculation of water table as well.
Effects of Wettability and Zeta Potential of Filter Medium on Oil Removal
Authors: Chang Qing , Yang Bin Wu , Wei Bi Gui
Published: November 2010

The methods and devices which can be used to determine the wettability and zeta potential of filter medium were developed according to the principles of capillary rise and streaming potential respectively. Lipophilic Hydrophilic Ratio (LHR) was defined based on Washburn equation. LHR values and zeta potentials of some conmen filter media were measured respectively, and the oil removal efficiencies of these filter media were also tested. The result shows that the effect of wettability on oil removal efficiency is much greater than that of zeta potential in conmen condition. The oil removal efficiency mainly depends on LHR value of filter medium, not on zeta potential of filter medium.
Numerical Study on Influences of Process Parameters on Laser Tube Bending
Authors: Guan Yan Jin , Zhang Hong Mei , Sun Sheng , Zhao Guo Qun
Published: November 2010

Laser bending process of tubes is a new flexible forming process without rigid tools and external forces. The tube is formed by internal thermal stress induced by laser irradiation. The process simulation of laser bending of tubes is realized numerically. When the other parameters remain invariable, the laser bending angle augments with the increase of the laser power. The laser bending angle decreases with the increase of the scanning velocity. Meanwhile, the bending angle varies with the diameter of the laser spot. The angle begins to decrease when the laser spot diameter get to an optimum value. The bending angle enlarges if the scanning wrap angle augments. The bending angle is largest when the scanning wrap angle is 180°. When the scanning wrap angle is over 180°, the bending angle decreases with the increase of the scanning wrap angle. The relationship between the number of scans and the bending angle is about in direct ratio. The bending angle induced by the first irradiated time is the largest.
Finite Element Analysis and Structural Optimization of Heavy-Duty Truck's Carriage
Authors: Wang Xiao Nan , Du Lin Xiu , Di Hong Shuang
Published: November 2010

The purpose of this paper was the optimization design of heavy strength carriage for 50t heavy-duty truck. Two optimization schemes B and C were provided based on original scheme A, which have different thickness of sole/side plate and main longitudinal girder and different number of strengthening ribs. ANSYS was used to do the finite element analysis of equivalent stress and elastic displacement of truck carriages. The equivalent stress of main longitudinal girder, soleplate and transverse bars of soleplate will increase when the soleplate’s thickness was reduced. The maximum of equivalent stress will increase 13%~15% with 1mm reduction. When the thickness of side plate or the number of side plate’s strengthening ribs was reduced, the elastic displacement of side plate would increase. Scheme C fulfilled the requirement of structure strength, in which the elastic displacement increases in the allowable range and the lightening ratio was 12.6%. Scheme B didn’t fulfill the requirement of structure strength. The numerical results provided theoretical foundations for optimization design of carriage in actual production and the solutions of expansion of carriage.
Effect of Incident Angle on Laser Transformation Hardening Layer Microstructure and Properties
Authors: Qiu Xing Wu
Published: November 2010

Laser transformation hardening was carried out by HL-1500 CO2 laser on 40Cr steel. The macroscopic and properties were analysised by scanning electron microscope, X-ray diffractometer, microhardness meter and potentiostat. The result indicated that, the hardening layer is mainly constitute by Fe-Cr, C0.09Fe1.91, Fe2Si. After laser transformation hardening the hardness enhanced greatly, the maximum of hardness appears in the subsurface, which value is as about four times as that of the substrate, both wear resistance and corrosion resistance are improved. With the increase of the laser incident angle, microstructure’s inhomogeneity becomes larger, properties become decreased.
An Extended Design Platform Identification Method
Authors: Lin Kang , Wang Hui , Li Jin Guo
Published: November 2010

Nowadays a general platform has played an important role in the product design process. As the traditional similarity measure used in module division is to the design stage in which the features and set are static, it is impossible to find the similar components in alterative design stages. For this reason, a new common platform design method on extension-distance is presented. According to build the relative function, the threshold used in the key module identification is easy to generate. Then the tolerance-constraint functions in the customized components division for the common platform generation. Then the adaptability measure is used to find the optimal case in the database. The measure has been used in the gasoline saw common platform design process.
Study on Friction and Wear Properties of Plasma and Laser Coatings of Aluminium Bronze Powder
Authors: Wang Huai Zhi , Wang Zhi Ping , Lu Yang , Li Ya Fei , Tian Guo Qing
Published: November 2010

Cu-14Al-X alloys was made into powder and then the powder was coated onto the surface of AISI 1045 steel respectively via plasma spraying and laser cladding technologies. Microstructure and phases of the coating were investigated by EPMA, XRD, SEM et al. Friction and wear properties of the two coatings were tested by RFT- friction and wear testing machine. The results indicates that the two coatings all consists of β′, α, K and γ2 phases and the structure of laser cladding is more evenly distributed. Under the condition of boundary lubrication, abrasion mechanism of laser coating remains abrasive grain abrasion. There is also adhesion abrasion under the condition of high load. While abrasion mechanism of plasma coating is slight abrasive grain abrasion and adhesion abrasion under low load. With the load increasing, adhesion abrasion intensifies. In a word, microstructure of laser coating is more even and compact.
Numerical Approach in Predicting the Formation Process of Tandem Explosively Formed Projectile
Authors: Zheng Yu , Li Song Da , Wang Xiao Ming , Li Wen Bin , Li Wei Bing
Published: November 2010

In order to find a proper resolution scheme for the formation process of tandem Explosively Formed Projectile (EFP) from shaped charge with double liners (SCDLL). 2D hydrocode was used to study the formation and penetration of SCDLL impelled by detonation products. The simulation is conducted to compare the effect of the following three resolution techniques on the prediction of velocity and shaped of EFP: Lagrangian, Eulerian-Lagrangian Coupling and Eulerian. In the simulation, shaped charge with one high explosive and two liners, ignited at the center point is studied. The results obtained from simulations are compared to experimental X-ray pictures. The simulation results including the Lagrangian resolution applied on liners agree well with experimental results when the friction coefficient between two liners is set to 0.28. The study results can provide important reference for engineers to analyze and design the tandem EFP.
Effect of Melt-Casting Temperature on Bonding Zone of CuNiMnFe30CrMnSi Integral Material
Authors: Zou Jun Tao , Liu Yan Feng , Wang Xian Hui , Liang Shu Hua
Published: November 2010

The effect of melt-casting temperature on the microstructure and properties of transition interlayer for CuNiMnFe/30CrMnSi material was investigated in vacuum condition. The results show that the thickness of the transition layer and its bond strength increase, and then decrease with increasing temperature. At 1130 , the intermediate transition layer has the largest width, which is 132μm, and the tensile strength can reach up to 1322Mpa. In the intermediate transition layer, mutual diffusion occurs among these alloying elements. These elements, such as Cu, Ni and Mn, diffuse into 30CrMnSi and results in the formation of Fe base solid solution, and no harmful brittle phases are produced in the proximity of bonding interface, thus it has a good metallurgical bonding for the two materials.
Study on Chemical Conversion Treatment and Electroless Nickel Plating on AZ91D Magnesium Alloy
Authors: Qiu Xing Wu
Published: November 2010

AZ91D magnesium alloy were used as the materials in this experiment. The directly electroless nickel plating, the stannate conversion processing and the electroless nickel plating on the surface of the magnesium alloys that have formed the stannate chemical conversion film on their surface were researched. The morphologies, anticorrosion ability and the hardness of plating of the magnesium alloys after chemical conversion processing and plating nickel were analysed by scanning electron microscope, salt droplet experiment, microhardness survey etc. The result of the experiment showed that, the conversion film unions with the substrate well, the conversion coating can avoid intense galvanic corrosion after the expiration of the plating, and enhanced the corrosion resistance of the plating. The nickel plating deposited on the conversion coating has high microhardness which could provide good protection for the magnesium alloys.
An Approach Based on the Classical Free-Electron Theory to Study Electroplastic Effect
Authors: Li Da Long , Yu En Lin
Published: November 2010

Based on the classical free-electron theory, the mechanism of electroplastic effect is studied at a microscopic level. A method is presented for calculating the amount of metal’s flow stress for electroplastic effect. This calculation method takes into account the free electrons exchange energy with metallic ions with a current pulse applied and considers the energy cause the change of the dislocation Gibbs free energy of activation. The results indicate that the metal’s flow stress drop associates with an enhanced plastic strain rate. At last, the effects of current parameters and microscopic parameters on the metal’s flow stress for electroplastic effect are discussed.
Synthesis and Magnetic Properties of La-Doped Ni Ferrites
Authors: Luo Ju Hua
Published: November 2010

Ni ferrites doped with lanthanum with a nominal composition of NiFe2-xLaxO4(x=0.05) were obtained by mechanochemical treatments using NiCO3•2Ni (OH)2•4H2O , La2O3 and Fe2O3 as raw materials. Both series of materials were characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM). The results indicated that the mixture became amorphous stage after ball-milled for 30 h, and single phase NiFe1.95La0.05O4 could be obtained after calcined at 700 for 2 h. The addition of lanthanum resulted in a reduction of all the magnetic parameters evaluated.
Design of the Parametric Simulation Program for Multi-Point Forming Based on APDL
Authors: Ma Hao , Wang Wei Wei , Yu Jing Bo
Published: November 2010

Two difficulties exist in the finite element analysis of multi-point forming: the complicated modeling process and the difficulty to control the movement pattern of more punches simultaneously. In the present paper, the design process of parametric simulation program for multi-point die forming and force-displacement separated control forming by using ANSYS parametric design language (APDL) is described. The rapid modeling is realized by use of the parameter input dialog box. The calculation program for the original position of each punch is designed, and then the stroke of each punch is determined. The process of model definition, loading and analysis is controlled by customized multi-point forming toolbar. The parametric finite element analysis process for spherical surface forming with the force-displacement separated control forming method is described in the paper. The results indicate that the simulation requirements for different parameters and different forming modes can be satisfied by the designed parametric simulation program.
Synthesis of Tetrapod ZnO by Direct Oxidation of Zinc Metal at Elevated Temperature
Authors: Li Dun Fang , Wang Cheng Yan , Yin Fei , Chen Yong Qiang , Liu Quan Ming , Jie Xiao Wu
Published: November 2010

ZnO product with tetrapod-shaped morphology was simply synthesized by controlling the evaporation and oxidation process of zinc metal. Pure bulk industrial zinc (99.995%) was first cast into small zinc pieces with a weight about 10～50g and then was heated in an alumina crucible in a furnace from room temperature to 1000～1250°C holding temperature, where the zinc pieces were vaporized and oxidized into zinc oxide products. The effects of zinc amount and holding temperature on the morphology of zinc oxide were investigated in this study. The products were confirmed to be zinc oxide with hexagonal wurtzite structure by X-ray diffraction analysis (XRD). Scanning electronic microscopy (SEM) analysis indicated that the morphologies of the products were T-ZnO whisker when the adding amounts of the zinc pieces were 20g and 30g, respectively. Based on the experimental results, it was speculated that crystal growth of T-ZnO comprised the formation of nuclei and the growth of need-like whisker.
Microwave-Irradiated Preparation of Super Absorbent Resin by Graft Copolymerization of Cellulose and Acrylic Acid/Acrylamide
Authors: Shu Jing , Li Xiao Jing , Zhao Da Biao
Published: November 2010

Graft copolymerization of acrylic acid(AA) and acrylamide(AM) on cellulose to prepare super absorbent resin (SAR) under microwave irradiation were investigated using N,N-methylene bis-acrylamide as crosslinking agent, and potassium persulfate/sodium thiosulfate as initiator. The results indicated that it only needed 5min under the microwave level of 320W to obtain the resin with the maximum absorption amount of 1388g•g-1 , under the conditions that the ratio of acrylic acid to cellulose of 14:1, 0.25wt% initiator to AA, 0.25wt% crosslinking agent, 70% neutralization degree of AA. Under microwave irradiation, the preparation of SAR could be completed without the protection of nitrogen. Compared to conventional heating method, the methods had the striking advantages of short reaction time, simple process and low cost.
Numerical Simulation of Fracture Propagation of Concrete on Meso-Level
Authors: Wu Feng
Published: November 2010

In the paper, concrete on meso-level is taken as three phases composites consisting of aggregate、matrix and bond between matrix and aggregate. Model and arithmetic of Interface Element Method (IEM) is introduced and used to study the fracture characteristic and process of concrete under uniaxial load.
Direct Slicing Cad Models with Solidworks for Integral Stereolithography System
Authors: Xu Guang Shen , Zhang Jian Ping , Luo Sheng , Jin Jing
Published: November 2010

According to the requirements of integral Stereolithography (integral SL) System, a new direct slicing method with SolidWorks for integral Stereolithography System is developed. Slicing function of SolidWorks is employed to slice CAD models directly, and section image of 3D models can be obtained and saved as image format. Dynamic graphic masks for the integral SL System are created according to the cross-section images that obtained through the slicing method, and then 3D real prototyping can be fabricated conveniently. A 3D cup model is sliced with this method, and the cup prototyping also is built with integral SL System. This experiment shows that direct slicing CAD models with Solidworks can be used for integral SL system, and the method of direct slicing CAD models can improve the efficiency of slicing process. Compared with the STL format files slicing method, the new method does not need to inspect and repair models data, and it can achieve high accuracy of layer section profile. The direct slicing method provides a basis for integral SL system to fabricate objects with high accuracy.
Nano-Al2O3 Film Prepared on Porous Silicon by Sol-Gel Method
Authors: Zhong Fu Ru , Tie Chang Jun , Lv Xiao Yi , Mo Jia Qing , Jia Zhen Hong , Jiang Tao
Published: November 2010

We report the structural and optical properties of a-Al2O3 film grown on porous silicon substrate using sol-gel method. The results indicated that a-Al2O3 film were grown after it sintering at 1200 °C for 1 hour and the scanning electron microscopy image shows the a-Al2O3 film has a nanostructure. From the photoluminescence spectrum, it shows that a narrow purple emission peak. This proved porous silicon is a good substrate to grow a-Al2O3 film.
Removal of Heavy Metal Ions from Water Using Porous Nano-Barium-Stroutium Titanate as an Adsorbent
Authors: Zhang Dong
Published: November 2010

The ability of porous nano-barium-stroutium titanate (PBST) to remove heavy metal (lead, nickel and zinc) ions by sorption from aqueous solution was assessed. The effects of process parameters such as pH, contacttime, regeneration conditions and the effects of common coexisting ions on heavy metal (lead, nickel and zinc) ions uptake were investigated. The results showed that the lead, nickel and zinc ions studied could be quantitatively retained at a pH value range of 5~8. The adsorption capacities of PBST for lead, nickel and zinc were found to be11 6.5mg•g-1, 4.8mg•g-1 and 8.3 mg•g-1, respectively. Desorption studies were carried out successfully with diluted HNO3 solutions. The results indicate that PBST can be used as an effective adsorbent for the treatment of wastewaters contaminated with lead, nickel and zinc ions.
Allometric Scaling Relationship between Solution Concentration and Nanofiber Diameter in Bubble Electrospinning and its Experimental Verification
Authors: Liu Yong , Dong Liang , Fan Jie , Wang Rui , Chen Ru Dong
Published: November 2010

An allometrical scaling relationship between the solution concentration and the nanofiber diameter in bubble electrospinning was established. The scaling law was validated with experimental results using bubble-electrospun Polyvinylpyrrolidone (PVP) nanofibers at different concentration PVP solutions. The results showed that the average diameter of PVP nanofibers increased approximately exponentially with solution concentration in bubble electrospinning process. The experimental data agreed well with the theoretical predictions, and showed that the present model had high prediction accuracy.
Analysis and Design of Magnetorheological Damper
Authors: Huang Jin , He Jian Min , Lu Guo Ping
Published: November 2010

Magnetorheological (MR) dampers are the semi-active control devices that use MR fluids to produce controllable dampers. In this paper, the design method of the cylindrical MR damper is established. Bingham model is used to describe the constitutive behavior of MR fluids subject to an applied magnetic field. The equation for the damping force is derived to provide the theoretical foundation for the design of the damper. Based on this equation the engineering expressions for the gap and effective length of the annular MR fluid between the piston and the outer cylinder are derived. The result shows that with the increase of the applied magnetic field strength, the damping force is increased. The dimensions of the gap and length can be calculated when the required damping force, the velocity of the piston, and the desired control damping force ratio are specified.
Hydrothermal Synthesis and Characterization of PbTiO3 Microrods
Authors: Yang Lin Lin , Wang Yong Gang , Wang Xiao Feng , Wang Yu Jiang , Han Gao Rong
Published: November 2010

PbTiO3 microrods were successfully synthesized via a surfactants-free hydrothermal method. The powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and photoluminescent spectra techniques (PL). It was found that the precursor played a key role in the formation of PbTiO3 microrods.
Preparation and Capacitance Properties of Titania Nanotube Arrays
Authors: Xie Yi Bing
Published: November 2010

The well-defined titania nanotube arrays with a tunable pore size and tube length have been fabricated in an organic medium-assisted anodization process. The obtained titania nanotubes have been applied for electric double layer capacitor applications. The electrochemical capacitance performance is highly dependent on the pore size and tube length of nanotube arrays. The increase of pore size can significantly enhance specific capacitance of titania nanotube arrays. Comparatively, the increase of tube length can only improve specific capacitance to a small degree. In addition, a higher specific capacitance of titania nanotube array can be achieved in an acidic solution rather than an alkali solution.
Preparation of CuO-CoO-MnO/SiO2 Nanocomposite Aerogels and the Effect of Synthesis Conditions on Gelation
Authors: Zhao Yue Qing , Liang Ying Hua , Li Feng Feng , Chen Hong Ping , Liu Xin Hua , Guo Hong Xia
Published: November 2010

CuO-CoO-MnO/SiO2 nanocomposite aerogels were prepared by using tetraethyl orthosilicate (TEOS) as Si source, and aqueous solution of Cu, Co and Mn acetates as transition metal sources via sol-gel process and supercritical drying (SCD) technique. The effect of synthesis conditions on gelation was investigated. The composition of the nanocomposite aerogels was characterized by electron dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The specific surface area of the nanocomposite aerogels was determined by the Brunauer-Emmett-Teller (BET) method. The results show that the range of optimal temperature for gelation is 30-45 °C, and the pH is 3.0-4.5. CuO-CoO-MnO/SiO2 nanocomposite aerogels are porous with a specific surface area of 384.9-700.6 m2/g. Compared to CO2 SCD, ethanol SCD is even favorable to the formation of aerogel with high specific surface area. The transition metals content in the nanocomposite aerogels can be controlled to be 0.71-13.77 at.%.
Effect of Preparation Methods of HPW/SiO2 Mesoporous Composites on its Catalytic Performance in Fuel Oils Desulfurization
Authors: Yan Xue Min , Mi Yuan Zhu
Published: November 2010

Two kinds of mesoporous HPW/SiO2 composites, which have been synthesized respectively by the amino-functionalized (AF) method and evaporation-induced self-assembly (EISA) method, have been used as catalysts in the oxidative desulfurization process of dibenzothiophene(DBT). The catalytic performance results show that the catalyst synthesized by EISA method holds higher catalytic activity than that synthesized by the AF method. The difference of catalytic activity can be attributed to the different synthesis mechanism of two kinds of composites. In the AF method, the bonding force between HPW and SiO2 is strong acid-base interaction, which damages the Keggin structure. Whereas in the EISA process, electrostatic force and hydrogen bonds between W=O groups and Si-OH groups are main bonding forces. The hydrogen bond holds the electron-withdrawing effect, which increases the activity of nonbonding W=O groups in HPW and then results in the enhancement of the catalytic activity.
Template Assisted Ultrasonic Process Synthesis and Luminescent Properties of Eu3+ Doped LaPO4 Nanocrystals
Authors: Wu Yan Bo , Sun Peng , Yu Hong Quan , Zeng Si Si
Published: November 2010

Polyvinglpyrrolidone (PVP), cetyltrimethylammonium bromide (CTAB), and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123) were used as templates, respectively. The morphology, structure and luminescent properties of the products were characterized and studied. The results show that all the products are pure LaPO4 with hexagonal structure. Comparing with the morphologies of LaPO4:Eu3+ nanocrystals prepared with PVP and CTAB as templates, the LaPO4:Eu3+ nanocrystals with P123 as template present regular spherical structure. The sizes of all products are in the range of 50–120 nm. When ultrasonic time was 2 h, the tendency, intensity and stability of fluorescent irradiation is obviously difference with different templates. In addition, the luminescent intensity of the LaPO4:Eu3+ nanocrystals using PVP as template is the strongest and using P123 as template is the weakest. All above results indicate that the template kinds have played an important role in the morphology and luminescent properties of the LaPO4:Eu3+ nanocrystals.
Analyzing and Counter Plan Researches on Technical Index of Wire Electric Discharge Machining Based on the Surface Quality Issues
Authors: Feng Jin Chun , Wu Xian Wen , Li Deng Wan
Published: November 2010

In this paper, the writers analyze some issues that influence parts surface quality on HS- WEDM and its related counter plan, which are Summed up from practice and producing experiences. It has certain guiding significant to improve surface quality of part in practice production.
Magnetic Nanoparticles Derivatized with Dual Functional Groups for Environmental Applications
Authors: He Hai Bo , Guo Qing Zhong
Published: November 2010

In this study, the magnetic nanoparticles derivatized with dual functional moieties of dodecyl and mercapto were prepared, which characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), surface area and pore size determination, fourier transform infrared spectrometry (FT-IR) and water contact angle analysis. The new material was proved to be an effective sorbent for environmental remediation.
Synthesis of Tungsten Oxide Nanorods as Visible-Light-Driven Photocatalysts
Authors: Chang Xue Ting , Sun Shi Bin , Yin Yan Sheng
Published: November 2010

Non-stoichiometric tungsten oxide nanorods with length up to few microns and diameters of 5-20 nm were initially prepared using a simple solvothermal method. The as-synthesized tungsten oxide nanorods were found to exhibit excellent photocatalytic properties under visible light irradiation. The degradation ratio of the methyl orange solutions by the tungsten oxide nanorods was as high as 98% under irradiation for 2.5 h. The excellent visible-light-driven photocatalytic properties of the hydrothermally-prepared nanorods may be due to a combination of their unique structure, outstanding light adsorption feature and high specific surface area.
Synthesis of Highly Mono-Dispersed Mesoporous Silica Spheres
Authors: Zhu Gui Ru , Wang Li , Wang Duo , Gao Cong Jie
Published: November 2010

Mono-dispersed mesoporous silica spheres with highly ordered hexagonal regularity were synthesized by hydrothermal method with tetraethoxysilane (TEOS) as silica source, cetyltrimethylammonium chloride (C16TAC) as template, methanol as co-solvent, and sodium hydroxide as alkali source. The influence of the C16TAC concentration, TEOS concentration, methanol/water ratio and the synthesis temperature on morphology and mesostructure of the prepared silica particles were investigated in detail. The results showed that the synthesized mono-dispersed spherical silica particles have ordered hexagonal mesoporous structure, high specific surface area and uniform pore size distribution.
Manufacturing the Hybrid Materials of Polypropylene/Nano Poly(Phenylsilsesquioxane) with Good Thermal Stability
Authors: Wang Xin Long , Li Jin
Published: November 2010

The nano poly(phenylsilsesquioxane) particles (nano-PPSQ) were prepared with both basic and acidic catalyzed processes and the PP/nano-PPSQ composites were prepared by melt blending method. The morphology and thermal stability of PP/nano-PPSQ composites were characterized by SEM, XRD and TGA. The SEM results showed that the particles were well dispersed in the PP matrix and the XRD revealed that the addition of nano-PPSQ influences the crystallinity of PP. The thermogravimetric analysis results of the PP/ nano-PPSQ composites indicated that the incorporation of nano-PPSQ can improve the thermal stability of PP obviously.
Investigation into the Effect of the Nut Thread Cutting on the Stress Distribution in a Bolt Using the Finite Element Method
Authors: Duan Zhi Dong , Gao Jun Feng , Su Tie Ming
Published: November 2010

In order to abate fatigue fracture at roots of the first or the second hackle thread of bolt used for hydraulic press ,law of stress and load distribution in bolt threads suffered the axial forces were researched by using nonlinear finite element method.It was found that Peak equivalent stress in roots near axial force are abviously greater than these far away axial force when nut threads are in elastic range,but almost are equial to stress in roots far away axial force when 70% nut threads are in plastic region.Nut thread cutting to the fisrt two teeth can improve stress distribution in a bolt ,but these improvement recede quickly as plastic rigions of nut threads extend.
Drug Release Behaviors of a Novel Ph/Temperature Responsive Hydrogel with Jujube Cake-Like Structure
Authors: Deng Kui Lin , Li Qian , Li Xiao Hua , Gou Yu Bo , Dong Li Rong , Huang Chun Yuan
Published: November 2010

A novel jujube cake-like pH/temperature responsive hydrogel, as a drug delivery system, was prepared by two steps in this paper. The intelligent copolymer hydrogel (PME) was obtained from N-acryloylglycinate methyl ester (AGME) and N-acryloylglycinate ethyl ester (AGEE), using sodium laurate (SL) as an emulsifier and N, N '-methylenebisacrylamide (NMBA) as a crosslinking agent. Selecting indomethacin as a model drug, in vitro drug release behaviors were investigated at different temperatures, phosphate buffer solutions (PBS) and emulsifier content. The cumulative release of indomethacin from the pH/temperature sensitive hydrogel was apparently increased as the emulsifier content increased, the pH value increased and the temperature decreased. 48% indomethacin from the hydrogel PME was released in pH 7.4 PBS at 18 oC within 600 minutes, whereas only 17% indomethacin diffused into pH 2.1 PBS.
A Hot-Melt Thermosetting Phenolic Prepreg and its Composites
Authors: Liang Bin , Chen Li Xin , Dong Jian Na , Zhao Hui Xin , Liang Feng Fei
Published: November 2010

A novel phenolic resin suitable for hot-melt impregnation process was developed through copolymerization. The curing reactivity, gel properties and viscosity of the resin were tested to evaluate the resin reaction process. A prepreg of this resin and glass fabrics was developed with hot-melt process. The cured phenolic prepreg laminates havebalanced mechanical properties. It can be used to manufacture interior structures for airplanes and high-speed trains or other applications with flame retard requirement.
Regeneration of IMAC-Cu Proteinchip by Borate Eluent
Authors: Cai Yu , Du Tao , Zhao Sheng Li , Wen Jiu Ba
Published: November 2010

Influence of borate eluent pH value and competition eluant on regeneration of the used IMAC-Cu proteinchip is investigated by SEM and SELDI-TOF-MS proteinchip detection system. The results show that proteins are easier to be removed from the used proteinchip surface with the decreasing of borate eluent pH value, but its destruction to the chemical structure of the proteinchip also grows in intensity. The elution effect of protein on IMAC-Cu proteinchip can be significantly enhanced when the competition eluant Gly or EDTA is added to borate eluate. However, comparing with Gly, EDTA as competition eluant has generation effect. The absorption protein quantity and type of the regenerated IMAC-Cu proteinchip by the pH 8 borate eluent added 0.02mol/L EDTA for 72h is very similar to the fresh chip after absorbing same serum of cancer patients.
Effect of Sintering Temperature on the Properties of Sludge Ceramics and Fly-Ash Ceramics
Authors: Yue Min , Yue Qin Yan , Qi Yuan Feng
Published: November 2010

The object of this study is to investigate the sintering mechanism of lightweight ceramic by different sintering temperature. The raw materials were sewage sludge and fly-ash, and clay was added as cementing agents (by ratio of 50wt% in each sample). The raw materials were mixed and pressed into raw pellets. After drying and preheating treatment, the raw pellets were sintered at temperatures ranging from 1050 to 1150 , in 25 increments for 10min. The physical properties (bulk density, grain density, water absorption and rate of expansion) were the indexes used to determine the technical parameters for the preparation of lightweight ceramic pellets and investigate the sintering mechanism of bloating. The results suggested that temperature was the key control factor of sintering process, and 1150 was the starting point of bloating reaction. Observation of the microstructure by SEM indicated that a higher flux content in the raw materials could lower the melt point during sintering process.
Study of the Bonding Property between Flanges and Web Plates of Wood I-Joist
Authors: Zhang Xu Jie , Hu Ying Cheng , Fang Ye Cheng
Published: November 2010

Wood I-joists is a kind of wood-based engineering material which was widely used in wood construction. As it is in fact, the property of I-joists are influenced not only by normal stress but also by a part of shear stress when they are taking into application. In this study, the effects of different factors were evaluated on the tensile property of the wood I-joists. The factors include the depth of the tanks on the flanges, the length of joint and different kinds of flanges. The method of control test was used in the process of the experiment design, and tensile shear test were taken during the experiment at the aim of testing the bonding property of the I-joists using a universal mechanical testing machine. Ultimately, it has been discovered that the factor of depth of the tanks and the length of the joint influence the bonding property mostly. So this paper offers the optimal fabrication technology of the I-joists to make it is possible for the increase of reliability when wood I-joists are taken into application.
Effect of the Simplifcation to Structural Systems on Nonliner Performance of Tall Buildings
Authors: Du Wen Xue , Zhang Ling Xin
Published: November 2010

In order to obtain correct nonlinear performance of tall building at seismic zone, several typical planar and elevation irregular tall buildings with different structural system are mainly discussed in the paper. Effect on the seismic response of structures due to the hazard bearing structure simplification are analyzed so as to obtain nonlinear performance accurately of structures for the seismic risk analysis, important influencing factors are also discussed followed. The results show that it is efficient to forecast the performance of tall buildings for the seismic risk analysis at seismic zone after Wen-Chuan Earthquake in China cities.
Preparation and Properties of Rigid Polyurethane-Imide Foams
Authors: Sang Xiao Ming , Chen Xing Gang , Yu Shou Wu , Hou Gui Xiang
Published: November 2010

A series of rigid polyurethane foams are synthesized via the reaction of isocyanate terminated polyimide prepolymers with polyether polyol. Deionized water and n-pentane are used for blowing agents. The prepolymers and polymers are characterized by conventional methods, and physical, mechanical and thermal properties are studied. The results show that in comparison to pure polyurethane foams, these rigid polymer foams exhibit improved thermal stability as well as good compressive property. SEM of the compressed body of rigid polyurethane-imide foams show that the destructive forms are open-type tear of the film and the breakdown of the cell body wall.
Effect of Film Thickness on Structure and Property of Pb(Zr0.53Ti0.47)O3 Thin Film
Authors: Shi Min Xian , Mao Wei , Qin Yan , Huang Zhi Xiong , Guo Dong Yun
Published: November 2010

Pb(Zr0.53Ti0.47)O3 thin films with thickness of 120nm, 190nm, 310nm, 440nm and 630nm were deposited on Pt/Ti/SiO2/Si substrates by sol-gel process through repeating spining process 2 times, 4 times, 6 times, 8 times and 10 times respectively. The structures of PZT films were investigated by SEM and XRD analysis. The ferroelectric hysteresis loops were recorded by Radiant Precision Workstation and dielectric properties were measured using an Agilent HP4294A impedance analyzer. X-ray diffraction indicated that with the film thickness increasing, the diffraction intensity increased. The thickness of PZT film had great effect on ferroelectric and dielectric properties. Conclusively when the film thickness was about 310nm, the PZT thin films possessed better ferroelectric and dielectric properties.
Kinetic Study on the Preparation of Poly(Phenylene Sulfide Ether)
Authors: Gu Ai Qun , Li Zuo Cai , Xu Lin Jie , Yu Zi Li
Published: November 2010

The polycondensation kinetics of 4,4’-dihydroxydiphenyl sulfide (DHPS) with 4,4’-dichloro diphenylsulfide (DCPS) was investigated in the presence of catalyst 2A. The reaction follows second-order kinetics and the reaction rate is a bimodal, a relatively lower rate initially and a faster rate after 3h. The initially lower rate is attributed to the lower solubility of DHPS salt in organic solvent. The results show higher polymerization temperature leads to higher conversion and finial reaction extent after 7h. In the present work, catalyst 2A/DHPS molar ratio of 0.17 is considered more suitable for PPSE preparation. The activation energy of two-stage polymerization of PPSE is 104.5kJ/mol and 79.33kJ/mol, respectively. According to obtained kinetics parameters, curves of fractional conversion versus reaction time were simulated and compared with experimental curves at different temperatures.
The Effect of Thermal Aging on Tensile Strength of Three-Dimension and Five-Direction Braided Carbon Fiber/BMI Composites
Authors: Guo Qi Wei , Li Jia Lu , Zhang Guo Li , He Ye Hong , Zhang Ming , Chen Li
Published: November 2010

This work aims at investigating the effect of thermal aging on tensile properties of three-dimension (3D) and five-direction braided carbon fiber/BMI resin composites prepared by resin transfer molding (RTM) process. The influence of high temperature on the tensile strength and the failure mechanisms of un-aged and aged composites were studied, respectively. As for the thermal aging condition, 180 for 24h was selected. The tensile strength of both un-aged and aged specimens were tested by SHIMADZU universal material testing machine at room temperature. The fracture modes of specimens were observed by scanning electron microscopy (SEM). It was found that the tensile load at break and tensile strength decreased after ageing. From the SEM views of the failed samples, the fracture surface presented hackles which were specific to the debonding of the interface between fibers and matrix. A lot of fibers were pulled-out in the aged state specimen. It can be confirmed that the failure occurred at the fiber/matrix interface and the fiber/matrix interface seemed to be weak in aged carbon fabrics reinforced BMI composites.
Decoloration of Methyl Orange by Mineral-Catalyzed Fenton-Like System of Natural Schorl and H2O2
Authors: Li Yan , Xu Huan Yan
Published: November 2010

The decoloration of methyl orange (MO) dyeing wastewater by mineral-catalyzed Fenton-like system of schorl and H2O2 was conducted in this study. The experimental results showed that schorl could efficiently make MO decolor in the presence of H2O2. Through a number of batch decoloration experiments under various conditions, it was found that the MO decoloration ratios increased by increasing the reaction temperature and the optimum addition of schorl and H2O2 was 1g and 1mL, respectively. At pH=2, a maximum of MO decoloration ratio could reach 99%. About 99.61% of MO decoloration ratio could be achieved in presence of schorl and H2O2, which was much higher than that in presence of schorl or H2O2 only, with MO decoloration ratio of 60.88% and 52.8, respectively, which suggested the schorl-catalyzed Fenton-like reaction governed the MO decoloration process. Otherwise, the MO decoloration ratio could be enhanced under the condition of agitation or UV-irradiation. The decoloration mechanism analysis revealed that the MO decoloration process was governed by a mineral-catalyzed Fenton-like reaction. Fe2+/Fe3+dissolved from the surface of schorl catalyzed the decomposition of H2O2 to produce OH radical, which then oxidized the MO.
A New Formula of Voids in the Mineral Aggregate (VMA) of Hot Mix Asphalt (HMA) and its Application
Authors: Liu Shu Tang , Shao Chang Shun , Cao Wei Dong , Liu Xiao
Published: November 2010

Voids in the mineral aggregate (VMA) is an important volume index for hot mix asphalt (HMA). In the popular HMA design methods such as Superpave system and Marshall Method an accurately calculated VMA is a crucial selection index for the aggregate gradation design. In this article a new formula for calculating VMA is established from the mathematic deduction based on the air voids and traditional VMA formulas. The new built VMA formula can be used to examine the result of the existing empirical equation in the aggregate gradation design process of Superpave. In fact, when the estimated asphalt content is determined according to the initial asphalt content the new formula can completely replace the empirical one for estimating VMA, offering conveniences to calculating.
Carbon Nanotubes Reinforced Aluminum Matrix Composites by High-Energy Ball Milling
Authors: Wang Xiao Fei , Cai Xiao Lan
Published: November 2010

CNT-reinforced aluminum matrix composites was produced by high-energy ball milling, the effect of rotary speed and milling time on the particle size distribution,the density and hardness of CNT-aluminum matrix composites were studied,it was observed that the rotary speed and milling time have an important effect on the mechanical properties of the CNT-aluminum matrix composites.
Transformation Induced Plasticity Behaviors of TRIP Steels with Different Heat Treatment Processes
Authors: Zhu Fu Xian , Zhang Ming Ya , Zheng Dong Sheng
Published: November 2010

Two-stage heat treatment process which has guiding significance for continuous annealing TRIP steel producing was applied in this research. Different matrixes such as polygonal ferrite matrix, bainite ferrite matrix and annealed martenite matrix were obtained through different heat treatment processes. Compared the transformation-induced plasticity (TRIP) behaviors of three different tested samples，and the corresponding process for required product properties can be chosen. It was found that the needle-like retained austenite obtained in AMT steel was isolated from other microstructures while the retained austenite in the other two samples appeared to be equiaxed or network structure. The elongation, yield ratio and stability of retained austenite in AMT steel were all higher than that in PFT or BFT steels. BFT steel possesses highest tensile strength and lowest elongation while the yield ratio, RA content and carbon concentration in RA were all lowest for PFT steel.
The Investigation of Ultrahigh Pressuer Sintering of Cubic Boron Nitride with the Binding Agent of Si3N4
Authors: Lin Shao Jie , Wu Yi , Zou Zheng Guang , Shen Yu Fang
Published: November 2010

Selecting Si3N4 as binding agent and Al2O3–Al–Y2O3 as sintering additives, the sintered compact of polycrystalline cubic boron nitride (PcBN) was studied . By modifying the ratio of each component and the parameters of the sintering process, the compact sintered at 4.5 GPa and 1650 °C showed good mechanical properties.The phase constitution, microstructure of the sintered compact were characterized by XRD and SEM respectively. The degree of phase transformation of Si3N4 , the chemical reaction during the sintering process, and the sintering mechanism of the additives were discussed . The best relative density is more than 97 % , the flexural strength is more than 650 MPa, the Vickers hardness Hv is more than 8.7 GPa.
Preparation and Characterization of LPAAM Superabsorbent Composite
Authors: Xie Jian Jun , He Xin Jian , Zhang Hui Ying , Han Xin Qiang
Published: November 2010

Kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbents composites(LPAAM) were prepared by solution polymerization using sodium lignosulfonate, acrylic acid and acrylamide as raw materials, kaolin as inorganic filler, potassium peroxydisulfate as initiator, N,N’-methylene-bis-acrylamide as crosslinker and by saponifying 2h under 90 , 0.10mol/L NaOH solution. Its equilibrium absorbencies in distilled water and 0.9%NaCl solution are 1003g/g and 89g/g, respectively. The structure, morphology and thermal property are testing by FTIR, SEM and TG, respectively.
Effect of Super Slag Powder on Pore Structure and Compressive Strength of RPC
Authors: Zhang Ping , Li Qiu Yi , Zhao Tie Jun , Xue Xiang Xin
Published: November 2010

This paper deals with RPC produced by superfine slag powder(measured specific surface area is 1824 m2/kg) and natural sands with a low water-binder ratio(0.2 or so),which strength can achieve 100MPa after 28d standand curing. An analysis,based on the mercury intrusion porosimetry,is made of the relationship between strength and pore structure parameters.The results show that the strength can be improved in the range of 30～45%, when the dosage of superfine slag powder varied from 5% to 15%；the linearity between compressive strength,water-binder ratio and the hole with a daimetre larger than 100nm are 0.72 and 0.92 respectively;and the RPC’s 28-day compressive strength produced by the natural sands, with a maximum grain size of 4.75 mm,is almost equal to the RPC produced by standard sands.