bluuebunny/crossref_metadata_2025 huggingface dataset:
Eshelby-Kröner Viscoelastic Self-Consistent Model Multi-Scale Behavior of Polymer Composites under Creep Loading
Authors: Yousfi A. , Fréour Sylvain , Jacquemin Frédéric
Published: April 2013

The mechanical response of the composite structure in T650-35/PMR-15 aged at different temperatures was studied numerically. The time-dependent internal stresses in the composite ply and its constituents were computed during the creep process. In order to predict the effective properties of PMR-15/T650-35 composite ply in the temperature range [250-350°, the time-dependent mechanical properties of PMR-15 matrix determined experimentally [, were considered. The mechanical properties of the fibers do not experience any change due to the aging process in such a temperature range [2, . In order to achieve the computations, the visco-elastic Eshelby Kröner self-consistent model was used.
Elastic and Elasto-Plastic Study for Bucket Tooth - Contribution to the Increase for Resistance of Collapse -
Authors: Zamma Abdellah , Jalal Salah Eddine , Boubeker Brahim
Published: April 2013

The bucket is a metal entity, linked to a machine called DRAGLINE, used for loading the different sizes of granular materials in large quantities. Each bucket is provided with six teeth which in contact with materials to be discharged, in order to extract the mineral. These teeth are connected to the bucket via a semi-rigid connection. In operation, except for the wear phenomenon "normal", some teeth break after a few hours of operation at the fixed portion in the singularity region (radius of curvature equal to zero). We observed via elastic numerical simulation in quasi-static regime, performed using PATRAN and NASTRAN software, that hot spots are located at the singularity region. We also used this numerical calculation for analyzing the effect of the variation radius of curvature on the stress concentration factor by plotting the variation of this factor vs of said radius.
To deepen, we repeated the same study but this time considering the material of the tooth as elastic perfectly plastic for seeking the limit load. For each value of the radius of curvature, was plotted the variation of the elasto-plastic external force according to the displacement of the front end of the tooth, knowing that the other end is fixed.
Analysis of Design Parameter Influence on the Dynamic Frequency Response of CFFF Honeycomb Sandwich Plate
Authors: Mankour A. , Boudjemai A. , Amri R. , Salem H.
Published: April 2013

In the aerospace domain, sandwich plates represent an efficient structural element, providing a high stiffness/weight ratio characteristic. Moreover, when using this structural element, different design parameters and materials of the core can be adopted in order to obtain desired properties. When the dynamic analysis of the spacecraft structure made up of the honeycomb sandwich plates is performed in MSC Patran/Nastran. In this study a three dimensional finite elements of a clamped-free (CFFF) honeycomb plate under dynamic vibrations loading had been analysed. Geometric parameters of hexagonal plate is specific to absorb vibrations, hence the effect of each parameters is crucial to determine the rigidity of plates under a single-point cyclic loading. The effect of honeycomb core thickness, unit cell size, and the materials contribute to determine the rigidity of honeycomb plate. Therefore, all of the analysis results can accommodate bases for structural design and optimum design of the spacecraft structure.
Fatigue Behaviour of the Laminates Jute/Epoxy
Authors: Mir A. , Aribi C. , Bezzazi B.
Published: April 2013

Work presented is interested in the characterization of the quasistatic mechanical properties and in fatigue of a composite laminated in jute/epoxy. The natural fibres offer promising prospects thanks to their interesting specific properties, because of their low density, but also with their bio deterioration. Several scientific studies highlighted the good mechanical resistance of the vegetable fibre composites reinforced, even after several recycling. Because of the environmental standards which become increasingly severe, one attends the emergence of eco-materials at the base of natural fibres such as flax, bamboo, hemp, sisal, jute. The fatigue tests on elementary vegetable fibres show an increase of about 60% of the rigidity of elementary fibres of hemp subjected to cyclic loadings. In this study, the test-tubes manufactured by the method infusion have sequences of stacking of 0/90° and ± 45° for the shearing and tensile tests. The quasistatic tests reveal a variability of the mechanical properties of about 8%. The tensile fatigue tests were carried out for levels of constraints equivalent to half of the ultimate values of the composite. Once the fatigue tests carried out for well defined values of cycles, a series of static tests of traction type highlights the influence of the number of cycles on the quasi static mechanical behavior of the laminate jute/epoxy.
Resonant Scattering and Absolute Phase Applied to Cylindrical and Spherical Hollow Fluids Embedded in an Elastic Medium: A Numerical Simulation
Authors: Rezzoug R. , Djelouah H. , Louni L.
Published: April 2013

This paper is based on the study of acoustic scattering classic RST, in which it was introduced the method of MRST (multichannel resonant scattering theory) to study the problem of interaction of acoustic waves normal incidence in environments consisting of a biphasic isotropic elastic matrix in which is inserted a fluid inclusion (cylindrical or spherical). Initially we implement the transition matrix S containing the mode n of the longitudinal (L) and transverse (T) of the wave in the elastic medium. The isolation of resonances characteristic of the fluid inclusion is done via the S-matrix factorization as a product of the matrix of soft bottoms no resonant matrix and resonances. To improve the localization of the resonances we undertake a study of the absolute phase in connection with MRST. A numerical simulation of cavity fluid (water) cylindrical and spherical copper in a matrix, showed the effectiveness of the absolute phase spectra for the exact determination of the resonances.
Phase-Change Materials and Building Energy Saving
Authors: Zhao Xiao Gang , Pan Ying
Published: April 2013

Phase change materials, abbreviated as PCM, due to the excellent heat storage performance, have been used as building materials and got more and more attention in recent years. The article introduce the building application of phase change material, and discuss its contribution to the building energy saving.
Second-Order Non-Linear Optical Properties of Y-Type S-Triazine Based Derivatives
Authors: He Zhan Rong , Chen Zi Ran , Xu You Hui
Published: April 2013

Six modules (Y1~Y6) containing Y-type s-triazine based derivatives were optimized using density functional theory at B3LYP/6-31+G* level. On the basis of the optimized structure, electronic absorption spectrum was calculated with TD-DFT(TDB3LYP/6-31+G*) and the second-order nonlinear optical properties (NLO) were calculated with finite field (FF) method and coded programs. The results indicated that these molecules had good nonlinear optical properties with 106 order of magnitude a.u. (10-27 esu) of 0 value. Introducing different electron groups to the end of the tri-branched chain of this derivative would cause different results. Introduction of strong electron donating group would make a relatively large increase of u thus improving their second-order nonlinear optical properties, and making this derivative a good non-linear optical material.
Developing a Wearable Multifunctional Composite Component
Authors: Makki Noaman , Pop-Iliev Remon
Published: April 2013

This paper focuses on the design and development of a low-cost multifunctional composite component integrated into a shoe hill that generates power in the order of milliwats (mW) through piezoceramic (PZT) stacks and stores this harvested energy in a capacitor integrated into the composite. The use of a thin-film lithium battery integrated into the composite is also explored as a means of permanent power storage. PZT bimorph elements are stacked in a cantilever manner. The space in-between and around the elements is being filled with foam, which provides structural support as well as walking comfort. An insole composite with a PZT layer is also developed that is capable of producing 2.2mW of power to give a total power output of 12.2mW for the in-heel insole combination. The experimental results revealed that the use of PZT bimorph elements (d33=110) instead of polyvinylidene difluoride PVDF sheets (d33=20) increased the power generation potential over five folds, which is further compounded by stacking the PZT elements.
Effect of Dynamic Strain Aging on the Mechanical Performance in Ti/STS439 Clad Materials
Authors: Ha Jong Su , Kim In Kyu , Hong Sun Ig
Published: April 2013

The effect of dynamic strain aging on the mechanical performance of Ti/STS439 clad material produced by hot rolling process was studied. A reaction layer with the thickness of approximately 3㎛ was formed during hot roll bonding process. The total elongation to fracture attains minimum values at about 400oC. The decrease of the ductility was accompanied by stress serrations in the stress-strain curves. At 400 oC, highly ductile and localized fracture with pin-point fracture surface occurred, suggesting the ductility minimum at 400 oC is extreme strain localization in the necked region due to low strain rate sensitivity
Effect of Size on Average Molecular Weight of Poly(Methyl Methacrylate) Micropattern during Hot Embossing
Authors: Lin Ching Bin , Chang Zue Chin , Ho Jin Shin , Hsiao C.F.
Published: April 2013

Hot-embossing experiments were conducted on poly (methyl methacrylate) orthogonal arrays with base widths of 1μm, 3μm, 5μm, 10μm, and 50μm. The relationship between the base width with respect to average molecular weight and number average molecular weight of micropattern were also investigated. It was discovered that the average molecular weight and number average molecular weight decreased as the base width increased.
Mechanical and Biological Characteristics of Electrospun PCL Meshes – the Influence of Solvent Type and Concentration
Authors: Dias Juliana , Gloria Antonio , Bártolo Paulo J.
Published: April 2013

Non-woven scaffolds, with fiber dimensions at a nanometer scale, can mimic the physical structure of natural extracellular matrices, being ideal construts for Tissue Engineering applications. This research work explores solution electrospinning to produce nanoscale meshes. Different Poly (ε-caprolactone) (PCL) solutions were considered and the influence of both polymer concentration and type of solvent studied regarding the fabrication of polymeric meshes and their mechanical and biological properties. PCL solutions were prepared using two different solvents: glacial acetic acid with triethylamine (AA/TEA)) and Acetone (DMK) at different concentrations. PCL/AA/TEA meshes present better mechanical properties and good cell viability and proliferation.
Ageing Effect on Mechanical Properties of Machined Nanostructures
Authors: Hu Xing Lei , Sun Ya Zhou , Liang Ying Chun , Chen Jia Xuan
Published: April 2013

Monte Carlo (MC) method and molecular dynamics (MD) are combined to analyze the influence of ageing on mechanical properties of machined nanostructures. Single crystal copper workpiece is first cut in MD simulation, and then the machined workpiece is used in MC simulation of ageing process, finally the tensile mechanical properties of machined nanostructures before and after ageing are investigated by MD simulation. The results show that machining process and ageing have obvious influence of tensile mechanical properties. After machining, the yield strength, yield strain, fracture strain and elastic modulus reduce by 36.02%, 28.86%, 20.79% and 7.16% respectively. However, the yield strength, yield strain and elastic modulus increase by 4.84%, 1.41% and 1.02% respectively, fracture strain reduce by 24.53% after ageing process. To research the ageing processes of machined nanostructures by MC simulation is both practical and meaningful.
Density Functional Theory Studies of Substitutionally Si-Doped Single-Walled Carbon Nanotubes
Authors: Yuan Ni Ni , Bai Hong Cun , Wu Yu Hua , Li Jun , Ji Yong Qiang
Published: April 2013

The hybrid nanostructures made of single-walled carbon nanotubes substitutionally doped with silicon atoms were investigated by quantum chemistry calculations based on density functional theory in this paper. The zigzag (12, 0) tube was considered to construct the Si-doped tubes. The geometrical structures, relative stabilities and electronic properties of the doped tubes were studied in details and compared with those of the pristine nanotubes. It is found that the Si-doped nanotubes exhibit lower thermodynamic stability than those of the undoped tubes from viewpoint of cohesive energy. The energy levels of the frontier orbitals vary very little when the silicon atom is introduced into the nanotubes. However, most doped tubes present larger Eg than those of the pristine ones.
Synthesis of SnO2 Nanotubes as High Performance Energy Storage Material for Photocathodic Protection of Metals
Authors: Zhang Na , Zhou Min Jie
Published: April 2013

SnO2 nanotubes were synthesized by a layer-by-layer technique on carbon nanotubes template. The obtained SnO2 nanotubes were characterized by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM). The as-synthesized SnO2 nanotubes coating exhibits high energy storage ability and good photocathodic protection property for metals.
Surface Morphology in Milling Multidirectional Carbon Fiber Reinforced Polymer Laminates
Authors: Gong You Hong , Yang Ni Hong , Han Shu , Chen Yan , Fu Yu Can , Han Sheng Chao
Published: April 2013

Carbon fiber reinforced plastics (CFRP) use in many industries applications has seen a dramatic increase over the last decade. Milling is the most practical machining operation for removing excess material. The work presented details the effect of different cutting parameters on the surface roughness and integrity of machined multidirectional CFRP laminates. The results indicate that the surface morphology mainly relates to the fiber orientation. Increasing cutting speed leads to severe softening, degradation and burning of the matrix material that binds fibers together. The feed speed has little effect on the surface morphology. And the roughness value Ra increases with the feed rate, and decreases with the cutting speed.
Investigation for the Fracture Process of WCp/Cu Functionally Graded Materials under Three-Point-Bending
Authors: Xia Hai Ting , Guo Rong Xin , Yan Feng , Yu Hai , Zhang Yu Bo
Published: April 2013

In this paper, the fracture process of WCp/Cu functionally graded materials(FGMs) was investigated. The used materials were fabricated by powder metallurgy using tungsten carbide(WC) particles and copper(Cu) matrix, and had functionally graded layers. In order to investigate the fracture process of the FGM, three-point-bending tests of rectangular specimens were carried out. From the results, it can be seen that the bending performance of FGM structures with increasing WC content from head layer to the bottom layer excels that of FGM structures with decreasing WC content in three-point-bending tests.
Quantum Cutting Downconversion in Tb3+,Yb3+ Codoped Sr3AlO4F Phosphor
Authors: Sun Jia Yue , Sun Yi Ning , Zeng Jun Hui , Zhu Ji Cheng , Du Hai Yan
Published: April 2013

A near Infrared (NIR) quantum cutting (QC) Sr3AlO4F:Tb3+,Yb3+ phosphor was synthesized by the conventional high temperature solid-state reaction. The luminescence spectra both in visible (VIS) and NIR regions and decay lifetime curves of Tb3+ have been measured to prove energy transfer (ET) from Tb3+ to Yb3+. Quantum efficiency (QE) related to Yb3+ concentration was calculated and the highest QE was found to be 135% hen Yb3+ doped concentration at 20%. The present Tb3+ and Yb3+ co-doped Sr3AlO4F phosphor may be a promising candidate to modify the spectral of the solar light.
Elastic Ply Damage Mechanics Modeling of Glass/Epoxy Laminated Composite
Authors: Chen Yong , Pang Bao Jun , Zheng Wei
Published: April 2013

In order to establish an elastic damage model for S2-glass/epoxy composite and identify the input parameters, in-plane behaviour of the composite including tensile, compression and tensile shear were investigated through series of tests. Concerning no plasticity, a simple elastic ply damage mechanics model for this composite was characterized based on Continuum Damage Mechanics Model (CDM) and the input parameters were obtained. The model was then implemented into ABAQUS/EXPLICT and the results show the model can capture most of the in-plane behaviour of the composite material.
The Yield Effect on Soil Improver and Straw Mulch Coupling in Inland Saline Areas
Authors: Yin Guang Hua , Gu Jian , Liu Zuo Xin , Sun Yi , Hao Liang , Cong Pei Fei , Ming Yang
Published: April 2013

A field trial of the effect of production research was carried out from 2010- 2011 in the northern of Liaoning province’s inland saline areas. The results showed that under the test conditions, soil improver and straw mulching had both a significant impact on yield, the interaction of the two factors application performed parabola opening down, the application program for the highest production, 10316.5kg/ hm2, was that soil improver was 1416.0kg/ hm2, straw mulching quantity was 4200.0kg/ hm2.
Luminescence Properties and Energy Transfer from Eu2+ to Tb3+ in Sr5(PO4)3F Phosphor
Authors: Sun Jia Yue , Cui Dian Peng , Xue Bing , Sun Guang Chao , Du Hai Yan
Published: April 2013

A series of single-phase Sr5(PO4)3F: Eu2+, Tb3+, Na+ phosphors have been synthesized by high temperature solid-state reaction. The photoluminescence excitation and emission spectra, concentration effect and energy transfer from Eu2+ to Tb3+ are investigated in detail. The work shows that there is an effective energy transfer from Eu2+ to Tb3+, where Eu2+ reveals an intense excitation band from 280 nm to 400 nm, matching well with the emission of n-UV chips, and Tb3+ emits an intense green emitting light.
Synthesis and Characterization of SrSO4:Sm3+ Phosphor with Hierarchical Structures
Authors: Sun Jia Yue , Sun Guang Chao , Cui Dian Peng , Xue Bing , Du Hai Yan
Published: April 2013

The SrSO4 spherical aggregates with hierarchical architecture was fabricated by using Sr(NO3)2 react with Na2SO4 aqueous solution under ambient conditions at room temperature. The SrSO4 spherical aggregates have a uniform diameter of about 10μm, which are composed of numerous well-aligned single tablet-like SrSO4 crystalline oriented radially to their centre. The phase structure, microstructure and luminescence properties were characterized by XRD, SEM, PL and DRS, respectively.
Design and Analysis of Optical-Communication-Band Sub-Wavelength Grating Polarizer
Authors: Cai Er Fei , Huang Yong Qing , Duan Xiao Feng , Ren Xiao Min
Published: April 2013

According to the requirement of the optical communication devices, sub-wavelength grating polarizer was studied based on rigorous coupled-wave analysis (RCWA) and designed with SOI materials. The paper analyzes the grating parameters such as the period, depth, fill groove that influence the diffraction efficiency of the grating. The TM mode diffraction efficiency is more than 95%, and the TE mode diffraction efficiency is less than 5%, the pyramidal sub-wavelength polarizer grating has good polarizer performance than others shapes in the optical communication band of 1550nm. In this paper, we designed this kind of sub-wavelength grating polarizer has great potential applying in optical switching, optical memory, optical detectors and other photo-electronic devices.
Properties and Performance Analysis of Woven Roving Composite Laminates for Automotive Panel Board Applications
Authors: Niranjan Raja R. , Kokan S. Junaid , Narayanan R. Sathya , Rajesh S. , Elanchezhian C. , Vijaya Ramnath B.
Published: April 2013

Now-a-days natural Fibers are employed in various engineering applications because of their high tensile strength, low thermal expansion, high strength to weight ratio and good corrosion resistance. In this paper, woven roving composite laminates are prepared to produce automotive panel boards. Even though, various methods are available for preparing composites like Pultrusion method, filament winding method and hand layup method, hand lay method is used in this paper. The bundles of woven roving are alkalized at concentration between 1.2 and 6% of NaoH. Then, the treated fibres with increased strength are used as reinforcement with Epoxy LY556 resin with HY951 hardener under room temperature. The tensile analysis is conducted for the specimens like plain specimen, specimen with circular central hole and specimen with rectangular central hole. The results show that plain specimen is having more strength followed by circular hole and then rectangular hole specimens. It suggested that the case industry can make near optimal circular hole for its components by replacing rectangular hole.
The Effects of Initiator Content on Sago (Metroxylon rottb.) Starch-G-PAN Hydrogel
Authors: Omar Nurizan , Ahmad Zuraida
Published: April 2013

This paper explores the effects of ammonium persulphate (S-PANHs) content (1wt % - 5 wt %) to the properties of sago starch-graft-polyacrylonitrile hydrogels (S-PANH). S-PANHs were prepared via graft copolymerization of polyacrylonitrile (PAN) onto sago starch in the presence of ammonium persulphate (APS) as initiator and N, N-methylenebisacrylamide (MBA) as crosslinker. The percentage of water absorbency is observed to increase with increasing initiator content from 1wt% until reaching optimum point of 3 wt% APS. 48.78 % water absorbency was recorded at 3 wt% APS sample. The morphology of the hydrogels from the micrographs captured via scanning electron microscope (SEM) revealed the existence of pores and matching with the results of percentage water absorbency. Fourier transform infrared (FTIR) spectroscopy proved that the grafting process had occurred in S-PANH.
Study on the Hydrolysis of Pollen in Pure Water under Microwave Irradiation
Authors: Wang Huan , Geng Li Li , Wu Bo , Liu Na , Zhang Dong
Published: April 2013

Pinus massoniana pollen was hydrolyzed by using the method of orthogonal experiment in pure water under microwave irradiation. The main influence factors of pollen microwave hydrolysis reaction was confirmed as temperature, weight ratio of pollen to water, microwave power and the reaction time, and its effects on the pollen microwave hydrolysis reaction was studied in detail. The results showed that the sequence of influence factors was reaction temperature>weight ratio of pollen to water>microwave power>reaction time. The optimal reaction conditions was that the temperature, 120oC; the power, 120W; the reaction time, 150min; the weight ratio of pollen to water, 1:10.
Study on a Structure of 2,6-Pyridine-Dicarboxylic Acid Lead, Pb(C7H3NO4)
Authors: Liu Hai Xing , Yang Ping , Guo Huan Mei , Yu Zhang Xue , Zhang Qing Hua , Zeng Guang
Published: April 2013

A novel Pb metal complex Pb(C7H3NO4) has been synthesized from a solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Pb atom is seven-coordinated by one N atom and six O atoms. The crystal packing is stabilized by O-H...O and O-H...N hydrogen bonding interactions.
Microstructure and Texture Characterstics of a Near-Alpha Titanium Alloy Tube
Authors: Zuo Yu Ting , Liu Shu Feng , Zhang Zhi Hui , Ma Hui Na , Xia Wen , Liu Ye , Zhao Qian Qing
Published: April 2013

A near-alpha type titanium alloy Ti-4Al-1.5Mn tube was analyzed after extrusion deformation and annealing treatment. Electron backscattered diffraction is employed to explore the Microstructure and texture characteristic of the recrystallization alloy. The alloy is consisted of equiaxed α grains and fine β phase with {1 0-1 2} twins .It was found that the (10-10) fiber texture along the extrusion direction was the dominate texture in this alloy and the volume fraction was 40.7%.
Photo Polymerization of Thiol-Hyperbranched Polysilazanes
Authors: Song Jia Le , Hao Peng Wei , Ye Chao Qiang , Chen Li Xin , Li Wei Guang
Published: April 2013

The kinetics of UV curable thiol-hyperbranched polysilazanes (HBP) was studied by differential photo-scanning calorimeter (DPC) technology. The effects of photo initiator concentration [I], light intensity I0 and temperature on the UV curing rate and the final unsaturated double bond conversion of thiol-HBP were investigated. The results indicate that the dependence of polymerization rate Rp on [I] and I0, respectively, was found to fit with theoretical predictions very well at [I] no more than 0.50wt% and I0 lower than 19.40mW/cm2. The kinetic parameters were calculated by autocatalytic model, and correspondingly, the total apparent reaction exponent and apparent activation energy are 8.76 and 13.97kJ/mol, respectively.
In Situ Modulation Excitation IR Study on the Dominant Product of Pt-Catalyzed Aromatic Ketone Hydrogenation
Authors: Chen Meng Meng , Maeda Nobutaka , Baiker Alfons , Huang Jun
Published: April 2013

Chemoselective hydrogenation of aromatic ketones plays an important role in producing fine chemicals and pharmaceuticals. One of the simplest model reactions is acetophenone (AP) hydrogenation to corresponding alcohol 1-phenylethanol (PE). We studied the role of dominant product 1-phenylethanol (PE) on a Pt/Al2O3 catalyst. In situ attenuated total reflection infrared spectroscopy (ATR-IR) in combination with modulation excitation spectroscopy (MES) and phase sensitive detection (PSD) revealed that PE was more strongly adsorbed on Al2O3 than on Pt. PE was hardly hydrogenated to 1-cyclohexylethanol (CE) on the support. CO from AP decomposition didn’t inhibit PE adsorption on the support. The strong adsorption and accumulation of PE on the support allows active sites on Pt always accessible to AP, achieving efficient Pt-catalyzed catalysis.
Numerical Simulation of the Transient Temperature Field during Gas Quenching
Authors: Li Zi Liang , Liu Mei Hong
Published: April 2013

Based on the theory of heat transfer, phase transformation and thermal non-elasticity, a nonlinear coupling heat-conduction equation considering phase transformation, nonlinear surface heat transfer coefficient and variable physical properties during gas quenching is proposed and solved by means of Finite Element Method (F.E.M). The transient temperature field is obtained and the influencing factors are analyzed and discussed. It might be valuable for some practical applications and for the development of theory.
Synthesis of sp3C1-Bridged Constrained Geometry Complexes and their Application for Copolymerization of Ethylene and 1-Octene
Authors: Mi Pu Ke , Kong Xiao Juan , Xu Sheng , Zhu Yu Lling , Cheng Lin
Published: April 2013

Novel sp3C1-bridged constrained geometry complexe(CGC) were synthesized, and fulvene was used as initial stuff, they were characterized by 1H-NMR, 13C NMR, MS and EA. The CGC/methylaluminoxane (MAO) system show activation for copolymerization of ethylene and 1-octene under 1.0 atmospheric pressure (Complex 2/MAO, 1.196 × 106 g-Polymer /mol-Zr•h, Pethylene = 1.0 atm, Al/Zr = 1000, time = 30 min,1-Octene content in polymer = 5.46 mol%).
Optimization of Micro-Arc Oxidation Electrode Structure by Finite Element Analysis
Authors: Wang Gui , Xu Jin Yong , Tang Yan , Gao Cheng , Shi Xiao Chao
Published: April 2013

In order to realize the application of finite element analysis in structural optimization of micro-arc oxidation electrode, effects of two kinds of electrode mode (one and two cathodes) on thickness and surface morphology of ceramic coatings prepared by micro-arc oxidation on aluminum alloy were researched by experiment. Meanwhile, Ansoft Maxwell finite element software was used to analysis the main influence factor (electric field intensity). We contrasted the analysis conclusion above with the forecast results in experiment. Effect of electric field intensity on thickness and surface morphology of ceramic coatings were explained from micro level, the correctness of the finite element analysis software was verified. The results show that three electrodes mode is better than two electrodes mode, the former can not only make the thickness of ceramic coatings thicker, but also make sure the size and quantity of discharge channel bigger and more, and growth power enough.
The Study on the Synthesis and Luminescent Properties of the Phosphor La2O3: Dy3+
Authors: Tang Wei Wei , Zhao Wen Yu , Fan Bin
Published: April 2013

In this paper, the phosphor La2O3: Dy3+ was synthesized by a gel-sel method and its structure, morphology, particle size, Photoluminescence (PL) and Cathodoluminescence (CL) properties were characterized by X-Ray powder diffraction (XRD), scanning electron microscopy (SEM),laser particle size analyzer, Photoluminescence (PL) and Cathodoluminescence (CL) spectra, respectively. The results indicate that the Dy3+ as luminescent centers substituted La3+ ions into the single crystal lattice of La2O3 and located in the sites of C3. The size of particles was nearly spherical with the diameter of about 1μm. The sample can be 350~500nm light into visible light. Whether Photoluminescence (PL) or Cathodoluminescence (CL), Two emission peaks at about 489 nm (blue) and 575 nm (yellow) were corresponding to 4F9/2-6H15/2 and 4F9/2-6H13/2 transitions with the maximum emission wavelength at about 575 nm. This white phosphor can be applied both in LEDs and in the field emission devices.
Investigation of Hot Deformation Characteristics of AISI 4340 Steel Using Processing Map
Authors: Sanrutsadakorn Apichat , Uthaisangsuk Viton , Suranuntchai Surasak , Thossatheppitak Borpit
Published: April 2013

Uniaxial compression tests at various temperatures from 850°C to 1200°C and strain rates between 0.01 s-1 and 10 s-1 were carried out in order to determine hot working characteristic of the AISI 4340 steel. The plastic stress-strain responses at high temperatures of the steel were provided. Constitutive relationship between the flow stresses and the Zener–Hollomon parameters was primarily established by means of a hyperbolic sine function for the entire range of the investigated conditions. Afterwards, the power dissipation map and instability map were developed on the basis of the Dynamic Materials Model (DMM). The variation of efficiency of the power dissipation calculated as a function of strain rate sensitivity represented material behaviors according to the microstructure evolution. The peak efficiency indicated an optimum processing window for hot working. In this study, processing map was obtained by a superimposition of the power dissipation and the instability criterion. The domains of temperature and strain rate, in which material flow stability occurred, were determined. For the AISI 4340 steel, the processing maps exhibited a distinct domain with its peak efficiency at about 1050-1200°C and 0.01-0.1 s-1, in which the peak efficiencies of about 40-50% were shown for different strains. In combination with microstructure observations after hot deformation, dynamic recrystallization zone could be identified in the processing map at a certain strain.
Cyclic Stress-Strain Response and Dislocation Configuration of a Beta Phase Containing TiAl Alloy during Isothermal Fatigue Tests under Different Strain Rate
Authors: Xiang Hong Fu , Tao Jing Hai , Wang Ji Heng , Li Hui , Dai An Lun
Published: April 2013

A beta phase containing titanium aluminum compound was prepared. Isothermal Fatigue(IF) were subjected at 650 °C at three strain rates, such as 6.67×10-3 s-1, 6.67×10-4 s-1, 6.67×10-5 s-1 to determine the effect of strain rate on cyclic stress-strain response (CSSR) of TiAl alloy during IF tests. The curves of cyclic stress-strain response were discussed and dislocations configuration were also observed by TEM. The results show that strain rates have an apparent effect on CSSR of TiAl alloy during IF tests and CSSR was identified that it had a close relationship with dislocation configuration and deformation twin.
Mechanical Properties and Microstructure of Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn Clad Plate Processed by High Pressure Torsioning (HPT)
Authors: Kim Hob Yung , Ha Jong Su , Oh Ki Hwan , Hong Sun Ig
Published: April 2013

Cu-1 wt. % Cr was clad between Cu-Ni-Zn plates to form 3-layered composite by high pressure torsioning (HPT) at room temperature and theirmicrostructure and mechanical propertieswereexamined. No intermetallic compounds were observed at the interfaces in the as-HPTed and heat-treated 3-layered composite plates. The strength of as-HPTed composite plate reached up to 650 MPa with the ductility of 7 %. After heat treatment at 500oC, Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn clad plate exhibited the strength up to 420 MPa and the ductility of 32 %. The clad plate fractured all together at the same time without discontinuous drop of the stress until final fracture. The excellent mechanical reliability and the good interfacial bonding strength can be attributed to the absence of detrimental interfacial reaction compounds between Cu-Ni-Zn and Cu-Cr.
Research on the Electro-Exploding Mechanism of Semiconductor Bridge
Authors: Li Yong , Zhou Bin , Qin Zhi Chun , Jia Xin , Wen Lei Ming
Published: April 2013

In an effort to elucidate the electro-exploding mechanism of semiconductor bridge (SCB), constant current was forced to flow through polysilicon bridge with a resistance about 1 Ω, while the response of voltage and current was measured to obtain its electro-exploding performances. The rise platform and subsequent peak in the current-time curve were observed. It is inferred from the optical signal that the first peak in the current curve results from the plasma generation of the bridge material. The entire electro-exploding process includes Joule heating, melting, vaporizing and plasma generating stage. The laws between performance parameters and the size or shape of bridge area were analyzed; it demonstrated that V-type angles on both ends of bridge were helpful for function time reducing, which provided an experimental basis for SCB design.
Wear Resistance of Graphite / Aluminium Composites that Prepared by Stirring Casting
Authors: Wu Lin Li , Yang Wen Jing , Xu Jian Rong , Yao Guang Chun
Published: April 2013

The graphite reinforced aluminum matrix composites were prepared by using stir-casting in this paper, with bulk alloy of ZL111, reinforcement of graphite particles coated with oxide, and the friction behavior was investigated perfectly. The results indicated that, the aluminum matrix composites reinforced with 6 wt.% graphite particles coated with oxide have a good property of self-lubrication under the condition of dry friction with a pressure of 40 N, a relative rate of 2.62 m/s of frictional backing gear, a wear time of 60 min, in addition, the friction factor and the wear capacity of the graphite / aluminum matrix composites were less than those of bulk alloy. Moreover, the friction factor and the wear capacity of the graphite / aluminum matrix composites decreased with an increase in mass fraction of the graphite coated with oxide, and the friction factor of composites became bigger while the fraction of the graphite particles was over 6wt.%.
Adsorption of Zearalenone by Montmorillonite
Authors: Zeng Lu , Wang Shu Ping
Published: April 2013

In vitro adsorption of zearalenone (ZEA) by montmorillonite (MONT) and organomodified MONT was investigated. Effects of dioctadecylmethylbenzyl ammonium chloride (DOMBAC) amount and interaction temperature were studied and when the MONT was reacted with DOMBAC of 1.44 mmol g-1 at 90 °C, the sample exhibited the highest adsorption capacity of ZEA (93.6%) that was much higher than MONT (10.5%). Both of them were characterized by XRD. The obtained results showed that the great difference of adsorption capacity between MONT and organomodified MONT mainly due to the greater surface area, higher porosity and hydrophobicity. These results suggest that organomodified MONT has the potential to be used as a promising adsorbent to bind the ZEA effectively and reduce its contamination.
Study of the Erosion-Corrosion Behavior of P110, N80 and VM140 Steel in 3.5wt.%NaCl Solutions with Sand
Authors: Dou Yi Hua , Li Yang , Wang Zhi Guo , Li Zhen
Published: April 2013

With the development of hydraulic fracturing technology, the failure of the equipments during production test and completion well becomes more and more severe due to the behaviors of erosion-corrosion. In this paper, the erosion-corrosion behaviors of N80, P110 and VM140 materials were investigated with the jet impingement experimental device. The corrosive rate of these materials by the weight loss method was carried out under different flow velocities and jet angles. It was observed that the weight loss of the three materials is increased by the rising of the impact velocity. The relation of erosion-corrosion weight loss to impact velocity is well described as the equation E=KVn (E is the speed, V is fluid velocity, k and n are the fitting parameters). As a results, the resistance ability for corrosion-erosion under experimental conditions is P110>N80>VM140.
Crystal Structure of Ytterbium Chloride Phenanthroline: [YbCl4]·[C12H8N2]·(H2O)
Authors: Liu Hai Xing , Xiao Jing Zhong , Yang Ping , Yu Zhang Xue , Zhang Qing Hua , Zeng Guang
Published: April 2013

A novel ytterbium chloride phenanthroline [YbCl4]·[C12H8N2]·(H2O) has been synthesized from a single solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Yb atom is coordinated by six Cl atoms. The plane quadrilateral is formed by two Cl2 and two Yb atoms. Molecules form O—H…Cl , O—H…O , O—H…N intramolecular and intermolecular hydrogen bonds and stabilized the molecular structure.
Effect of Transition Metal on the Thermal Degradation of Cotton Cellulose Modified with THPC
Authors: Sun Chun Feng , Gao Ming
Published: April 2013

The thermal decomposition of cellulose treated with tetrakis(hydroxymethyl) phosph- onium chloride (THPC), urea and ammonium dihydrogen phosphate (ADP) and its metal complexes was studies by TG, DTA and CONE. The activation energies for the second stage of thermal degradation have been obtained by following the Broido equation. Experimental data show that for the complexes of cell-THPC-urea-ADP with metal ions, the activation energies and thermal decomposition temperatures are higher than those of cell-THPC-urea-ADP, which shows these metal ions can increase the thermal stability of cell-THPC-urea-ADP. Moreover, Ni(Ⅱ), and Zn(Ⅱ) can more increase thermal stability of samples than Co(Ⅱ). The CONE data indicate that the transition metals have smoke suspension on cell-THPC-urea-ADP. Moreover, Co(Ⅱ) has more effect than Ni(Ⅱ), and Zn(Ⅱ) in the smoke suspension.
The Application of Large Particle Size Hot Mix Asphalt Macadam Roadbase Structure in the Maintenance Overhaul Engineering
Authors: Xia Hai Yan , Yang Zi Jiang , Yi Xiao Wei , Tan Jie
Published: April 2013

In recent years because of the growing volume of traffic, axle load and tire unit pressure increases, as well as in rough weather, under the action of the traditional cement stabilized macadam roadbase structure is easy to cause more reflection crack, rutting, pumping the asphalt such as early diseases, seriously affect the service life of pavement, and in the construction process for keeping in good health cycle is long and bring greater side to traffic edge construction of traffic organization pressure. Xiaogan belongs to the area of low winter air temperature and the high summer air temperature, traffic flow, high underground water level, the large size macadam base can reduce pavement cold cracking diseases, improve the pavement anti-rutting ability, so as to improve the durability of asphalt pavement.
Magnetic Dual-Phase State of Superparamagnetic Particles in the Field of Mechanical Stresses
Authors: Afremov Leonid , Ilyushin Ilia
Published: April 2013

The set of equation has been worked out, allow to study the effect of mechanical stresses on distribution of two-phase superparamagnetic particles over equilibrium magnetic states. The method of analysis of mechanical stresses effect on metastability of magnetic states of superparamagnetic two-phase particles system has been developed.
TiO2 Immobilized in RPF-AA Fiber for Photocatalytic Degradation of Low Concentration Methylene Blue in Aqueous Solution
Authors: Zhang Liu Xue , Xu Hong Wu , Wang Xiu Lian , Zhao Liang
Published: April 2013

The reactive polymer fiber with high adsorption capacity and good mechanical properties, RPF-AA, was prepared by the processes of pre-treatment, modification of the commercial PAN fiber. In order to improve the repeating circles of the semiconductor titania photocatalyst and broaden its applications, fine titania particles immobilized in RPF-AA fibers (TiO2/RPF-AA) were prepared successfully at room temperature by a dip-coating method. Tetrabutyl orthotitanate (TBOT) was hydrolyzed in presence of hydrolysis control agent tetrabutylammonium hydroxide (TBA)OH and the TiO2 fine particles were crystallized under microwave (MW) irradiation. The X-ray diffraction (XRD) analyses indicated that the fine particles obtained with MW irradiation have much higher crystallinity with a single phase anatase compared with the non-MW-treated solution. The continuous layers of titania were found on RPF-AA fibers by the scanning electron microscopy (SEM) analysis. The fibers with anatase coatings showed high photocatalytic property and better repetition on the photodegradation of MB. The coated fibers were scattered on the water surface and the catalytic reaction proceeded. After completion the decomposition process, the coated fibers were easily recovered using a filter.
Experimental Study on Bonding Interface between CFRP and Concrete under Fatigue Load
Authors: Zheng Xiao Hong , Huang Pei Yan , Guo Xin Yan , Han Qiang
Published: April 2013

Peeling along the interface between FRP and concrete under fatigue load is the common failure pattern for the RC structures strengthened with FRP. In this paper, five groups specimens were subjected to fatigue load to study the fatigue mechanism for bonding interface between carbon fiber laminate (CFL) and concrete. The Δσ~N curves for the bonding interface were derived from the experiments, the laws of strains and slip on interface were analyzed in this paper.
Observation of Wear on PEEK-PTFE Hybrid Radial Bearings
Authors: Koike Hitonobu , Mizobe Koshiro , Oyama Shunsuke , Kashima Yuji , Kanemasu Kenji , Kida Katsuyuki
Published: April 2013

In this paper, the wear performance of hybrid radial bearing (PEEK-PTFE and alumina ball) was investigated. For effective operation of equipment in clean energy facilities environment, the PEEK-PTFE hybrid bearings was developed. Radial PEEK-PTFE hybrid bearings were produced by machining and their rolling contact fatigue (RCF) behavior under non-lubricated condition was carried out. PEEK accumulation layer with PTFE and graphite appeared on the bearing's inner ring under 600-3000 rpm rotation speed. Due to the self-lubrication of PEEK layer, the wear loss of hybrid bearing cycles was lower than in the case of neat PEEK radial bearing. Moreover, It was found that the thin PEEK layer protected the raceway from the friction heat and wear.
Surface Profile Observation of PTFE Thrust Bearings under Rolling Contact Fatigue in Water
Authors: Itakura Kiyoto , Honda Takashi , Oyama Shunsuke , Kida Katsuyuki , Hazeyama Shintaro , Kashima Yuji
Published: April 2013

The life of the PTFE thrust bearing under rolling contact fatigue (RCF) was investigated. The different conditions of axial loads and the rotating speeds under water were applied. The shapes of the bearing race before and after the tests were measured by a two-dimensional shape measurement sensor. The wear loss of PTFE bearing was rarely generated and the shape of the bearing changed slightly in the test. However, it was found that the lifetime of PTFE bearing depended on the temperature generated in the contact surface. In our testing machine condition, the bearing was collapsed over a load of 1600 N.
Experimental Research of Foam Concrete with Different Fly Ash Level
Authors: Yue Jian Wei , Sun Zan Li , Wang Yong Feng
Published: April 2013

Based on the analysis of structure formation mechanism of foam concrete prepared with chemical method, investigations by a large number of comparative tests and quantitative analysis, quantitative relationship of compressive strength and fly ash dosage on 3d, 7d and 28d foam concrete specimens are analyzed. This investigation examined effect of fly ash that mixed into admixture concerning strength of low –density foam concrete. Mechanical test were performed to measure effect of fly ash on affecting compressive. Results indicate that fly ash significantly reducing compressive strength and increasing thermal conductivity of low-density foam concrete. Moreover, experimental results show that compressive strength of each group is more and smaller with the increase of the curing time.
Surface Morphology Investigation of Poly(ether ether ketone) Immobilized with Heparin and Bovine Serum Albumin
Authors: Sun Hui , Chen Rui Chao , Yang Biao , Xu Guo Zhi
Published: April 2013

The surface topography of poly(ether ether ketone) (PEEK) film immobilized with heparin and Bovine Serum Albumin (BSA) was characterized via scanning electron microscopy (SEM). Compared with the unmodified film, the surface of modified film changed and become rough, which indirectly proved the successful introduction of monomer and biomolecule on PEEK
Analysis of Relationship between Porosity and Roughness of Surface Based on Fractal Model
Authors: Chen Jin Qiang , Liu Xuan Zuo , Ridolfi Luca , Du Bei , Wang Hui Min , Zhang Fei
Published: April 2013

Based on fractal geometry, this paper established an experimental model of ballistic deposition using the two-dimensional teflon surface composed of particles, in order to probe into the relationship that the roughness and porosity of the surface correspond to the friction and gravity forces in the cases of varying slopes. The experiment tested the nonlinear growing, roughening and dynamic scaling record of the surface deposition image. 4,000 M6 nuts in a line were slid on a 1m×1m Teflon board placed in an angle to the horizontal plane and a photograph was taken for every falling. Then, the photographs were analyzed with digital image processing and photo calibration in MATLAB. The photo calibration and object detection have tried polynomial algorithm and Hough transform method. Also, the exponents for self-affine interfaces were verified according to the digital photography analysis. To an extent, the experimental study might reveal the relationships between roughness and porosity of a physical surface, which provided a first basis to conduct the mechanical analysis of relationship.
Two Dimensional Photonic Crystal Biosensors
Authors: Wang Hui Bo , Tong Kai , Gu Chao Cong , Zeng Weng Zhi , Lu Jian Ru
Published: April 2013

Based on the rigorous coupled wave theory, the narrowband reflect spectral imaging characteristics on two-dimensional photonic crystal are analyzed, and two-dimensional photonic crystal sensor probe biological structure and photonic crystal biosensor system are constructed. The simulation proved that, when the adsorption medium at the surface of two-dimensional photonic crystal are different, the white light narrowband reflection resonance mode peak wavelength would drift, and the drift quantity of the peak wavelength and the refractive index of the adsorptive medium is in a linear relationship. Colored the space imaging spectra of photonic crystal, the changes of the adsorbate refractive index in different area of the photonic crystal surface can be observed , the adsorbate concentration changes can also be got. This conclusion can be applied to biochemical substances, pharmaceutical, biological molecules and environmental pollution detection.