bluuebunny/crossref_metadata_2025 huggingface dataset:
A Coupled Sensitivity Method for Structural Damage Detection
Authors: Li Jing , Wei Pei Jun
Published: April 2013

Based on the vibration information, a mixed sensitivity method is presented to identify structural damage by combining the eigenvalue sensitivity with the generalized flexibility sensitivity. The sensitivity of structural generalized flexibility matrix is firstly derived by using the first frequency and the corresponding mode shape only and then the eigenvalue sensitivity together with the generalized flexibility sensitivity are combined to calculate the elemental damage parameters. The presented mixed perturbation approach is demonstrated by a numerical example concerning a simple supported beam structure. It has been shown that the proposed procedure is simple to implement and may be useful for structural damage identification.
Numerical Analysis on Steel-Kevlar-Steel Sandwich Structure under Contact Explosion
Authors: Wei Ji Feng , Yang Guo Shan , Li Yuan , Wang Shu Shan
Published: April 2013

The damage characteristics of the steel-Kevlar-steel structure are studied by nonlinear dynamics software. The whole destruction process of the sandwich structure is simulated. Moreover, the transmission and reflection of the shock wave in the structure are analyzed. It shows that the damage zone of the structure is just under the explosive. It is significantly different from the damage under non-contact explosion. The composite material has an effect on the spread of the shock wave, and effectively reduces the peak pressure. The sandwich structure has a good anti-impact performance. The results help to design and assess blast-resistant structures under contact explosion.
Analysis of Thermal Stresses in 304 Stainless Steel Plate-Fin Structure
Authors: Cao Huai Xiang , Qiu Xing Qi , Jiang Wen Chun
Published: April 2013

Thermal stresses in 304 stainless steel plate-fin structure at steady condition were calculated by finite element method. A squential coupling calculation procedure was developed to obtain the temperature and thermal stress distribution. The effects of plate thickness, fin thickness and filler metal thickness on thermal stresses were discussed. The results show that the thermal stresses in plate-fin structure are complex and nonuniform. The peak thermal stresses are shown in the fillet. With the plate thickness and fin thickness increasing, the thermal stresses are increased. The peak stresses are decreased as the filler metal thickness increasing.
Strong and Weak Ion Exchange Resin in Chemical Desalting Process Combined Application
Authors: Wang Shi Rong
Published: April 2013

This paper describes the strong, weak ion exchange resin in combined application of the principle, calculation method, and combined with the actual introduction of the combined application of the equipment and operation mode.
Rapid Laminated Manufacturing for Metallic Parts Based on Resistance Welding Double-Station LOM
Authors: Cheng Rong , Wu Xiao Yu , Luo Wei Hong
Published: April 2013

The adhesive strength between the metallic sheets and the way to remove the waste are the key problems of the laminated object manufacturing (LOM) for metallic functional parts. To solve these problems, a novel resistance welding double-station LOM was presented in this paper with its basic principles and implementation approach introduced. With 302 stainless steel sheets of 0.1mm in thickness as the model material, the rapid laminated manufacturing for metallic parts was conducted. As a result the plastic rapid injection mold shows its diffusion welding effect between sheets up to complete combination and its strength is more than 600MPa. The surface of plastic product injected according to the mold reaches the standard in dimensional accuracy and surface finish. The experiment has proved that the resistance welding double-station LOM is an effective method of the direct rapid manufacturing for metal parts of high strength.
The Optimization of Carbon Fiber Drawing Process Based on Cooperative Immune Clonal Selection Algorithm
Authors: Chen Jia Jia , Ding Yong Sheng , Hao Kuang Rong
Published: April 2013

Drawing is an important process during carbon fiber production. How to obtain the fittest drawing ratios distribute scheme is a typical multi-objective optimization problem. We propose a novel cooperative immune clonal selection algorithm (CICSA) to obtain the optimal linear density and breaking elongation ratio. The CICSA features in synergetic evolution, clonal operation and mutation operation. Compared with the immune algorithm and the genetic algorithm, it has the best performance in precision and convergence time.
NbF5 and CrF3 Catalysts Effects on Synthesis and Hydrogen Storage Performance of Mg-Ni-NiO Composites
Authors: Wan Qi , Li Ping , Wang Teng , Qu Xuan Hui
Published: April 2013

Two kinds of novel materials, Mg-1.6mol%Ni-0.4mol%NiO-2mol%MF (MF=NbF5, CrF3), along with Mg-1.6mol%Ni-0.4mol%NiO for comparison, were examined for their potential use in hydrogen storage applications, having been fabricated via cryomilling. The effects of NbF5 and CrF3 on hydrogen storage performance were investigated. A microstructure analysis showed that, aside from the main phase Mg, Ni and NiO phases, NbO, MgF2 and Mg2Ni were present in all samples after ball milling, MgH2 and NbH2 were observed in all samples after absorption. The CrF3-containing composite exhibited a good PCT results and a low onset desorption temperature under 0.1 MPa. The NbF5-containing composite exhibited a low absorption temperature of 323 K, a high hydrogen storage capacity of 4.03wt% at 373 K under the hydrogen pressure of 4.0 MPa, and it absorbed 90% of its full hydrogen capacity in 2700 sec and 100% in 5100 sec, it desorbed more than 1.8wt% in 3600 sec under vacuum environment. The CrF3-doped sample exhibited a low onset desorption temperature of 543 K under 0.1 MPa, and a low hysteresis coefficient of 0.25 at 573 K, and lower than 0.2 when temperature was 623 K. NbO and NbH2 played an important role in improving the absorption and desorption performance.
Heat Transfer Modeling for Vaporizing in Vacuum Electron Beam Welding on Magnesium Alloy
Authors: Luo Yi
Published: April 2013

A heat transfer model for vaporizing in vacuum electron beam welding on magnesium alloy is developed based on the laws of heat conduction and energy conservation. The vaporizing time of the main metal elements in AZ series magnesium alloy is calculated using the model. The results show that the vaporization of Mg element will precede the Zn element under the affecting of high energy density electron beam. The vaporizing times of alloying elements are not entirely dependent on the level of the boiling point, to a certain extent, also dependent on the thermal diffusivity and are closely related to the latent heat of vaporizing and melting of the materials. The change of beam spot diameter of electron beam also greatly alters the heat transfer characteristics of electron beam heat source beam. As the strong vaporizing effect of Mg element will occur within several milliseconds, the keyhole induced by the metal elements vaporizing is formed only within several milliseconds, but also the deep penetration welding effect of vacuum electron beam welding of magnesium alloys will be obtained in a very short period of time.
The Construction of Three-Dimensional Finite Element Model of TKA Knee
Authors: Jiang Bin , Dong Yue Fu , Hu Yang , Xu Qing Rong , Hu Guang Hong
Published: April 2013

The goal of this study is to construct a three-dimensional (3D) finite element model (FEM) of total knee arthroplasty (TKA) knee including bones, collateral ligaments and total knee prosthesis. Computed tomography (CT) and magnetic resonance imaging (MRI) image data of normal knee joint are imported into MIMICS software. The 3D models of bones and collateral ligaments are respectively reconstructed from CT and MRI image data. Then the reconstructed models are registered and fused together based on external landmarks. The virtual osteotomy and total knee prosthesis implantation are performed to establish the 3D model of TKA knee. Ultimately, A elaborate 3D FEM of TKA knee including anatomical structures and total knee prosthesis is obtained by meshing the 3D model of TKA knee and setting material properties, loading and boundary conditions. The obtained von Mises stress on the polyethlene insert confirms to the clincial mechanical distribution characteristics after TKA. The 3D FEM of TKA knee retains the integrity and accuracy in the anatomical features and provides a foundation for accurate research on the TKA knee biomechanical behaviors.
Analysis of Thermal Deformations of FGM Thin Plates
Authors: Wang Ming Lu
Published: April 2013

The governing equation of thermoelastic FGM thin plates was obtained by degenerating the governing equation of thermoviscoelastic FGM thin plates. A Navier solution of a simply supported FGM rectangular plate under thermal loads was get. Based on the Navier solution, the influence of considering and ignoring mid-plane stain, due to the inhomogeneous property of the functionally graded materials, on the maximal deflection and thermal stress of the functionally graded materials thin plate is investigated.
Combined Diagnosis Study for Terminal Main Insulation Hole Defect in 10kV Cross-Linked Polyethylene Cable
Authors: Cheng Zhi Wan , Yu Hong , Dong Tao , Zhao Xian Ping
Published: April 2013

In order to study the main insulation of cable terminal hole defect, using visual detection, infrared imaging spectrometer, ultraviolet imaging instrument and pulse current method for the defects of various means such as joint detection. The experimental results show that several ways in which judge cable terminal hole defects that is feasibility, reliability and validity.
Coal Metamorphism’s Influence on Coalbed N2 Concentration in Mining Area
Authors: Liu Chun Yan
Published: April 2013

Based on the systematic analysis of the data of 46 coalbed gas samples, this paper discusses the coal metamorphism’s influence on coaled N2 concentration in Mining Area . The results show that:Yanshanian magma’s "baking" is the main reason for the high N2 concentration; The coal metamorphic degree enhanced, ratios of N2/CH4 present the changing rule of "increase-decrease-increase"; In coking coal stage, the liberation rate of N2 by thermal ammonization is faster than the liberation rate of CH4, so ratios of N2/CH4 increase; In meager coal stage, NH3 generated by thermal ammonization participates in the formation of ammonium illite in the form of NH4+, thus the liberation rate of N2 decreases relatively, so ratios of N2/CH4 decrease; In the lean coal stage, organic nitrogen liberates N2 by thermal cracking effect, N2 concentration increases relatively again, so ratios of N2/CH4 increase.
Formation Energy Calculations of Impurity Elements at Substitutional or Interstitial Sites in Silicon
Authors: Hatanaka Hiroyuki , Hayafuji Yoshinori
Published: April 2013

One of promising candidates as dopants for forming ultra-shallow and high conductive source/drain in future silicon devices has been proposed to be dimer or trimer co-dopants containing pairs or trios of different impurity elements. Making choice of a combination of the impurity elements with a small ionization energy is essential for the appropriate dimers and trimers. In this work we calculated total energies of silicon with substitutional or ineterstitial impurity elements and derived formation energies for the substitutional and interstitial impurity elements for the atomic number 1 to 83 with the exception of inert gas and lanthanum series elements. We present here the periodic table with the formation energies of the substitutional and interstitial impurity elements for determining the most stable site of the impurity elements in Si lattice. We can use this table as a database for calculating ionization energies of the impurity element.
Controller Gain Design of 2-D Linear Systems Based on the Existing 1-D Analytical Solution
Authors: Liu Wen Jeng
Published: April 2013

Abstract. A controller gain design problem of two-dimensional (2-D) linear systems is proposed in this paper. For one-dimensional (1-D) systems, the necessary and sufficient conditions have been established for the problem, and an analytical solution for the feedback gain is given by [1]. Based on the existing 1-D analytical solution, a 2-D state feedback controller gain can be designed to achieve the desired poles. Finally, two numerical examples are shown to exhibit the validity of the proposed approach.
Calculation of VaR with the Bootstrap Method Based on Experts Predict in Mechanical Engineering
Authors: Shi Xia
Published: April 2013

Based on GARCH model to catch the financial data of auto correlation and volatility clustering, while the use of expert predictive value and the short term newer data using the Bootstrap method for Vary estimation. Through the SSE Composite Index of empirical research, the results show that this method can avoid the old data invalid information, at the same time the financial experts forecast was introduced risk management, improve the accuracy of the computation
The Research on Embedded Real-Time System Security Issues in Mechanical Control
Authors: Wang Xu Hui
Published: April 2013

Embedded real-time systems are facing more and more security problems. Malicious attacks on the system from suspicious or malicious code and the change of system hardware state could lead to system exception, resulting in system reliability and security deteriorated. This paper summarizes the characteristics of embedded real-time system and its special requirements for security, analyses security problems faced by embedded real-time system and defects of programming languages. And then put forward methods to improve the safety of embedded real-time system, providing a new security the idea for solving the embedded real-time system security.
The Effect of Non-Normality of Navier-Stokes Operator Mechanism on Dynamics of an Axisymmetric Swirling Flow
Authors: Chen Cheng , Shi Ya Yong
Published: April 2013

The effect of non-normality of the Navier-Stokes operator on the dynamics of an axisymmetric swirling flow, namely, the Oseen vortex, has been investigated. The eigenvalue analysis and transient growth analysis have been employed in order to obtain the least stable eigenmode and the global optimal perturbation, which are both considered as the initial perturbation. Three stages of dynamic process have been put into evidence for the evolution of the optimal perturbation. The early (linear) stage is characterized by the amplification of radial perturbation, consistent with the prediction of transient growth theory. Having come into the nonlinear stage, the perturbation energy growth is suppressed by the interaction between the vortex ring and the Oseen vortex core. Finally, the phenomena of secondary energy growth are also observed. Compared with the results obtained by applying the least stable eigenmode as the initial disturbance, the nonlinear behavior of the optimal perturbation features radial fluid motion and the rapid production of small eddies, which are both thought to be beneficial to fluid entrainment or mixing. The effect of perturbation amplitude on the nonlinear evolution of flows is also studied.
The Application of Web Data Mining System Model in Mechanical Engineering
Authors: Feng Cao
Published: April 2013

Web Data Mining is a new research field combining Data Mining with Internet, this paper introduces the significance, signification, and classification of Web Data Mining, then discusses the representative process of Web Data Mining based on XML detailedly, designs a material Web Data Mining system model and presents the structure frame and working mechanism of the system model for offering a competitive processing environment, it is advantageous to improving the whole performance of Web Data Mining.
Adaptive Selection of Processing Nodes for Spatiotemporal Query Algorithm Based on Agent in Mechanical Engineering
Authors: Jiang Wei
Published: April 2013

This paper on the existing spatio-temporal query processing algorithm for analysis and improvement of foundation, proposed an adaptive selection processing node algorithm and real-time aggregation method, combined with the STWin algorithm proposed a general framework, presents the adaptive selection of processing nodes for spatiotemporal query algorithm and APSTQ algorithm. The algorithm adopts adaptive strategy selection and rotation processing node, using active transfer method of real-time aggregation, which makes the algorithm of reducing energy consumption, prolonging the life cycle of sensor networks, to reduce the response time, improve the query efficiency and real time.
Optimizing Textile-Reinforced Composites for Pipe Connections
Authors: Karama Moussa , Mistou S.
Published: April 2013

The use of multi-layered composite materials in the confection of industrial pipe connections (elbows, reduction pipes, flanges etc.) is often put off because of the high cost of manufacture. The aim of this study is to replace the multi-layer process (woven reinforcement-organic matrix) by sandwich process with a view to reducing the cost of manufacture. Validation is carried out on different structures: ring, cylinder with and without end effect, elbows and floating flanges.
Analytical Solutions of Loaded Multifunctional Multilayered Plates
Authors: Ajdour M. , Azrar L.
Published: April 2013

Analytical solutions are derived for multifunctional N-layered rectangular plates. The multilayered plate may consist of linear elastic or piezoelectric laminates of arbitrary thickness. The related equations and formulae are developed based on the Stroh like formalism. Solutions for multilayered plates are expressed in terms of the propagator matrix and satisfy the continuity conditions of material layers. Various types of electrical and mechanical loading may be considered. Numerical results of stresses, electric potential and displacement for some multifunctional multilayered plates are analyzed
Optimization for an Electronic Card with a New Hybrid Method
Authors: Assif S. , Hachimi H. , Agouzoul M. , Ellaia Rachid , El Hami A. , Aoues Y.
Published: April 2013

Embedded electronic systems are playing a very important role in several areas, such as in automotive, aerospace, telecommunications and medical sectors. To properly perform their functions, electronic systems must be reliable [2. So in this paper, we present a new hybrid method of optimization by the heuristics algorithms to evaluate the reliability of the electronic card by simulating its thermo-mechanical behavior. A model of simulation by finite element is developed to consider the maximal deformations due to the temperature; a mechanico-computing coupling is used to find the optimal structure. This powerful and robust algorithm which is based on hybridation of Genetic algorithm with Particle swarm optimization PSO gives performance results.
Dynamics Instability Analysis of Multi-Walled Carbon Nanotubes Conveying Fluid
Authors: Azrar A. , Azrar L. , Aljinadi A.A. , Hamadiche M.
Published: April 2013

The dynamic instability analysis of conveying fluid multi-walled carbon nanotubes (MWCNT) is analyzed. Based on the nonlocal elasticity theory, Donnells shell model, potential flow theory and the van der Waal interaction between walls, the governing equations are formulated. The small scale parameter and the internal fluid interaction effects on the dynamic behaviors of the MWCNT-fluid system as well as the instabilities induced by the fluid velocity are investigated. The critical velocity and the frequency-amplitude relationships are obtained with respect to physical and material parameters.
Notch Fatigue Crack Initiation and Propagation Life under Constant Amplitude Loading through Residual Stress Field
Authors: Benachour Mustapha , Benguediab Mohamed , Benachour Nadjia
Published: April 2013

The purpose of this paper is to estimate the number of cycles for fatigue crack initiation in notched plate under constant amplitude loading through tensile residual stress field of Aluminum alloy plate. Residual stress field was generated by plastic deformation using finite element method. Simulation of fatigue behavior was made on AFGROW code. It was shown that the fatigue crack initiation and propagation were affected by level of residual stress filed. In this investigation, the presence of tensile residual stresses reduces considerably the total fatigue life. Loading parameter namely stress ratio was studied. The decreasing in this parameter reduces the fatigue crack growth rate (FCGRs).
Analysis of Multilayered/Sandwich Shells Using a New Discrete Finite Element Model
Authors: Sakami S. , Sabhi H. , Ayad R.
Published: April 2013

The model DDM (Discrete Displacement Mindlin), leads to a finite element which is geometrically simple: 4-node quadrilateral with 5 doffs per node for a shell and efficient. The mid-side rotational nodes, derived from a quadratic interpolation of normal rotations, are eliminated using a combination of local discrete kinematic and constitutive Mindlin hypotheses. The derived 4-node element is free of shear locking and passes all patch tests for thick and thin plates in arbitrary mesh. The applications concern the static and dynamic analysis of sandwich and multilayered shells.
SEM-EBSD Observations of Crack Initiation and Propagation due to Orientation Changes during Forming in Mild Steel
Authors: Boumaiza A. , Rouag N. , Baudin T. , Penelle R.
Published: April 2013

The change in crystallographic orientation distribution during deformation by deep drawing in mild steel has been investigated in order to understand their role in initiation and propagation of crack. The results show that the change of grain orientation from the initial recrystallization texture component of {111}<112> to deformation orientation {111}<110> incites the initiation and propagation of transgranular cracking in the region of {111}<112> small grains. Moreover, the transgranular misorientation and local orientation are analyzed in detail to discuss the change from {111}<112> to {111}<110>. The SEM-EBSD technique was used to reveal that change of orientationm, XRD was performed for the characterization of the global evolution of texture for deformed samples.
Mechanical Behavior of a Sandwich Composite with Cardboard Core Reinforced Fabric
Authors: Saidani K. , Ait Tahar Kamal , Merakeb S.
Published: April 2013

A sandwich structure is obtained from two skins or soles, with good mechanical characteristics, bonded to a core made of a lightweight material of low resistance. Glued to a core made of a lightweight material of low resistance. The strength and modulus of elasticity of the skin condition the bending behavior of a sandwich. Bending, the skins of the sandwich are solicited in traction and in compression, while the core is subjected to shear.
Our study focuses on the experimental characterization under flexural load of new composite sandwich combined. The sandwich proposed constituted of two skins armed by metal grids impregnated with epoxy matrix type STR and souls composed of hybrid corrugated cardboard reinforced by fabric. Several configurations of souls made from cardboard cellulosic and fabrics were taken into account.
An experimental and numerical investigation is conducted to analyze the behavior of these structures. The results show that the failure mode is strongly influenced by the stacking sequence considered.
Preparation and Purification Properties of Poly(Vinyl Alcohol) Nano-Fibers Based Sandwich Structure Material
Authors: Liu Rui Xue , Liu Tai Qi , Cao Bin Bin , Ma Fu Rui , Zhao Na , Zhao Xiao Long , Gao Ning
Published: April 2013

Electrospinning of PVA can be performed from aqueous solution leading to the generation of homogenous nanofiber webs. PVA nanofibers are generally required to be modified because of its poor stability in water. The water stability of PVA nanofibers was improved by heat treatment in this paper. The test results showed that the crystallinity of the PVA nanofibers increases after heat-treatment. The crystallinity which is the largest increased by 12% when they were treated at 150°C for 10 min. The heat-treated fibers don’t dissolve in water and show certain degree of agglutination and swelling. PVA nanofibers were taken as the inner layer of the sandwich structure purification material prepared with the hot pressing technology. The filtering experiment showed that the filtration properties were better when the area density of PVA nanofibers is 2.5g/m2. The filtration efficiency of materials and retention rate of PVA nanofibers decreased after being used for 5 times.
Preparation of Carbon Fiber Reinforced SiC Matrix Composites by PIP Process
Authors: Zhang Quan Qing , Zeng Tao , Cheng Su
Published: April 2013

The precursor infiltration pyrolysis technology for preparation of ceramic matrix composites (CMCs) is both flexible and tailorable to shape and engineering requirements. During sintering process, PCS experienced an organic–inorganic transformation and acted as the bonding material between Carbon fiber. Compare to PCS, the ceramic conversion rate of PCS-DVB increased to 70-75%, the main reaction zone temprerature reduced to 400-800°C, which is in favor of protecting carbon fiber.
Interfacial Microstructure of Diffusion-Bonded Cu/Cu-Ag/Al Hybrid Alloy
Authors: Lee In Ho , Lee Kap Ho , Hong Sun Ig
Published: April 2013

Cu and Al6061 alloys were diffusion-bonded at 530°C with Cu-15 wt. % Ag alloy as an intermediate layer and the interface microstructure were analyzed. The presence of Cu9Al4, CuAl and CuAl2 intermetallic layers were confirmed along with Ag3Mg and AgMg intermetallics. Ag was found to diffuse into Al, forming needle-shaped Ag2Al precipitates in Al substrate close to Al/Cu-Ag interface region. Micro-Vickers indentation aimed at the interface regions, CuAl/CuAl2 and CuAl2/Ag3Mg-AgMg lamella revealed that cracks were formed mostly around the indenter mark in CuAl2 layer more than in CuAl and no cracks in the Ag3Mg-AgMg lamella region, suggesting CuAl2 is more brittle than CuAl and Ag3Mg-AgMg lamella is rather ductile. Ag3Mg-AgMg lamella was found to be formed at the interface between Al and CuAl2. The formation of ductile Ag3Mg-AgMg lamella at the Al interface suggests that the diffusion bonding Cu and Al with Cu-Ag or Ag as a intermediate layer may increases the interface reliability of Cu/Al hybrid alloy.
Evaluating the Properties of an Alginate Wound Dressing for Skin Repair
Authors: Pereira Rúben , Mendes Ausenda , Bártolo Paulo J.
Published: April 2013

The treatment of skin lesions is a costly and complex process, for which different strategies are currently available. In this study, we investigated the properties of novel films composed of alginate and aloe vera gel for application as wound dressing material. The films combine the occlusive and haemostatic properties of calcium alginate gels with the therapeutic properties of aloe vera. We expect that these films may improve the healing process through the release of aloe vera compounds directly into the wound bed and could be an alternative to the administration of synthetic drugs to infected wounds. The films exhibited high transparency in both dry and wet state, as well as adequate mechanical properties for skin use. The results indicated that the films present great potential to be explored as wound dressing material.
Investigation on Transmittance and Uniformity of Light Diffuser Plate of Filling Coefficient of Microstructure
Authors: Gao Xiao Long , Wu Da Ming , Zhang Ya Jun , Zheng Xiu Ting , Liu Yan
Published: April 2013

In this paper, the filling coefficient is defined by the ratio between effective by light area and the total area of the light diffuser when a beam of light strikes it, namely micro lens array structure of configuration density. In order to analyze the relation between the filling coefficient of the microstructure and the optical properties of the diffuser, the filling coefficient is expressed as center-to-center spacing of the microstructure.As the the center-to-center spacing increases,the filling coefficient becomes smaller.and the relation between the filling coefficient of the diffuser microstructure and the optical properties of diffuser have also been simulated by the Light Tools software based on the Monte-Carlo Method. Then the test sample which has the same aspect ratio and filling coefficient with the simulation sample has been obtained by using micro injection casting, Comparing the haze and transmittance of the experimental diffuser with the simulation result, the relation between the filling coefficient of the diffuser microstructure and the optical properties of diffuser have been gotten.
Application of HVFA Concrete in Massive Structure
Authors: Li Xiang , Yan Jian Jun , Peng Shang Shi
Published: April 2013

C40R60 High volume fly ash (HVFA) concrete were adopted for the continuously casting massive foundation slab of Tianjin Tower, which has a volume of about 20 000 m3, to decrease the risk of cracking during the construction process. Suitable raw materials and mix proportion were chosen. The properties of hardened concrete cured under different conditions were investigated. The temperature development in the core of structure was measured. The results show that the temperature rise in the core is relatively low and the compressive strength curing under the standard condition for 60 days is 54.3MPa. HVFA concrete is much suitable to the massive concrete structure in which elevated temperature would be kept for a long time.
The Effect of Spin-Orbit Coupling on the Electronic Structures and Half-Metallicity of Heusler Compounds: V2ReZ (Z=Al, Ga, ln)
Authors: Jia Hong Ying , Dai Xue Fang , Wang Li Ying , Wang Fang , Chen Lei , Liu Xiao Chuang , Liu Guo Dong
Published: April 2013

We have studied the influence of spin-orbit coupling (SOC) on the electronic structures and half-metallicity for the V2ReZ (Z=Al, Ga, In) compounds. It was found that the SOC has a slight influence on the whole configuration of the electronic structure and the degenerated states were split into several singlet states at the high-symmetry points. The eg and t1u states near the Fermi level are not sensitive to the SOC. The t2g states composed of the side of half-metallic gap are sensitive to the SOC. The dispersivity of t2g states was strongly reduced, which lead to an increase of the valence electron effective mass and the width of half-metallic gap. The SOC can slightly increase the spin splitting of Re and V(B) atoms. The Z atom has an influence on the intensity of SOC to act on half-metallic gap.
Characterization of Contact Resistance between Carbon Nanotubes Film and Metal Electrodes
Authors: Han Ki Bong , Choi Yong Ho
Published: April 2013

Carbon nanotube has attracted great research attentions due to its outstanding electrical, physical, mechanical, chemical properties. Based on its excellent properties, the carbon nanotube is promising nanoscale material for novel electrical, mechanical, chemical, and biological devices and sensors. However, it is very difficult to control the structure of carbon nanotube during synthesis. A carbon nanotubes film has 3 dimensional structures of interwoven carbon nanotubes as well as unique properties such as transparency, flexibility and good electrical conductivity. More importantly, the properties of carbon nanotubes are ensemble averaged in this formation. In this research, we study the contact resistance between carbon nanotubes film and metal electrode. For most of electrical devices using carbon nanotubes film, it is necessary to have metal electrodes on the film for current path. A resistance at the contact lowers the electrical efficiencies of the devices. Therefore, it is important to measure and characterize the contact resistance and lower it for better efficiencies. The device demonstrated in this study using classical technique for metal contacts provides relatively reliable contact resistance measurements for carbon nanotubes film applications.
Analysis of the Effect of Temperature on Thermal Conductivity of the Insulation Block Made from Secondary Raw Materials
Authors: Kalužová Alena , Pěnčík Jan , Matějka Libor , Matějka Libor , Pospíšil Tomáš , Dostálová Darina
Published: April 2013

The increasing requirements for thermal protection of buildings results in promotion of the development of structural and material design of building facilities. Proper structural design of details then leads to elimination of thermal bridges and to improvement of the indoor environment. Waste management is one of the main features of sustainable construction. The solution of this problem is to extend the product life cycle by recycling. The contribution discusses the development of thermal insulating material block made of secondary raw materials - a thermal insulation composite material - TICM [1]. Uniform dispersion of grains of foamy glass waste (filler) in polymer filling from recycled thermoplastics (PP, HDPE) induces formation of particle composite. Decisive properties in choosing the materials to be applied include mainly the coefficient of thermal conductivity, volume density, compressive strength and water absorption. The coefficient of thermal conductivity λ [W/mK], however, varies depending on surrounding temperature and humidity.
Experimental Investigations on the Characteristics of Biomass and Coal-Biomass Fuel Briquettes
Authors: Sing Chin Yee , Aris Mohd Shiraz , Al-Kayiem Hussain Hamoud
Published: April 2013

Combustion of coal, a fossil fuel, in power plant, is a major source of carbon dioxide emission, a greenhouse gas that causes global warming. Malaysia is one of the major exporters of palm oil and has 421 palm oil mills operating in 2010. Some of the residues from these mills like palm kernel shell and palm mesocarp fibre were converted into value-added products. An optimum biomass fuel briquette was obtained with palm kernel shell and palm mesocarp fibre as the major ingredients. Co-firing coal with biomass is a possible approach for power plant to curb the excessive emission of carbon dioxide. In this study, bio-briquette having 50% coal and 50% biomass which consisted of the ingredients of optimum biomass fuel briquette were studied in details. Comparison of the fuel properties, combustion characteristics and carbon dioxide emission between the optimum biomass fuel briquette and bio-briquette was made.
Medium Optimization for Active Substance Production of Streptomyces alboﬂavus TD-1 Using Response Surface Methodology
Authors: Wang Zhi Fang , Zhang Hong , Wang Chang Lu , Li Zhen Jing , Li Feng Juan , Chen Mian Hua , Wang Yu Rong , Huang Yu Fang
Published: April 2013

To increase the production of active substances, response surface methodology (RSM) was employed. The results showed that the inoculation size, concentrations of MgSO4•7H2O and KNO3 in medium had signiﬁcant effects on yields of active substances and the ﬁnal values optimized with RSM were 12.75 % inoculation size, 0.34 g/L MgSO4•7H2O and 0.13 g/L KNO3, respectively, which increased 1.96 fold production of active substances in comparison to the production of initial fermentation conditions.
Molecular Weight and its Distribution of PET Depolymerization Catalyzed by Zn(Ac)2 under Microwave Irradiation
Authors: Shu Ke Wen , Tang Qing Hua , Wang Huan , Liu Na , Zhang Dong
Published: April 2013

In this paper, the molecular weight and its distribution of PET during the process of the PET depolymerization catalyzed by Zn(Ac)2 under microwave irradiation were determined and studied via the method of GPC in 180°C, 190°C and 200°C respectively. The morphologies of the undepolymerized PET observed by SEM was used for the comparation of using or no catalyst. The results shown that Zn(Ac)2 could accelerate the depolymerization rate significantly, and the catalytic effect in lower temperature was better than that in higher temperature.
Experimental Research on Properties of Low-Density Foaming Concrete
Authors: Yue Jian Wei , Yue Ting Ting , Wang Yong Feng , Gu Li Hua
Published: April 2013

Low-density foam concrete is inorganic material that can replace traditional organic materials for external wall insulation system. Based on the analysis of structure formation mechanism of foam concrete prepared with chemical method, investigation 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 CaO, blowing agent, fly ash that mixed into admixture concerning strength of low –density foam concrete. Results indicate that CaO, blowing agent, fly ash significantly affecting compressive strength ,density, thermal conductivity of low-density foam concrete. Especially, CaO, blowing agent and water play an important role in manufacturing operation 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. This phenomenon is different from common cement specimens and is disadvantage to engineering.
Numerical Simulation and Monitoring of Mass Concrete Wall Temperature Field
Authors: Wang Yan , Pang Er Bo , Zhang Heng Chun , Yang Long
Published: April 2013

This paper investigated the calculation of mass concrete wall temperature field by ANSYS and compared the results with measured results, based on radiation protection mass concrete wall of medical linear accelerator in Wuhan Union Hospital.The solid70 was selected as the concrete element and reasonable boundary conditions and environmental conditions were set in the analysis of ANSYS.The results shows that temperature field distribution and development law obtained through numerical simulation analysis are consistent with measured results,which can help set up the temperature monitoring points.
Rheological Properties of Polysulfonamide Spinning Solutions with Higher Ratios of p-Phenylene Segments
Authors: Li Hu Min , Peng Xiao Jie , Zhao Jiong Xin
Published: April 2013

Polysulfonamide (PSA) fiber is a kind of synthetic fiber with excellent high temperature resistance properties. However, the poor mechanical property has limited its application. In our previous research, we have concluded that the presence of more rigid segments of p-phenylene in the PSA copolymer backbone enhanced the strength and modulus of the fiber. In this paper, the rheological properties of PSA spinning solutions with higher contents of 4,4'-diaminodiphenylsulfone (4,4'-DDS) were investigated. Static state rheological properties of PSA spinning solutions were investigated by measuring the apparent viscosity versus shear rate at different temperatures. The results showed that three types of PSA spinning solutions were typical shear thinning fluid. And the spinning solutions of PSA with different ratios of 4,4'-DDS and 3,3'-diaminodiphenylsulfone (3,3'-DDS) showed the similar rheological properties, which meant that the spinning equipment and technologic parameter did not need to be updated to produce new PSA fibers.
Blue Upconversion Luminescence from Phosphor Tm3+/Yb3+ Co-Doped Gd2Mo3O9
Authors: Sun Jia Yue , Xue Bing , Sun Guang Chao , Cui Dian Peng , Du Hai Yan
Published: April 2013

The upconversion (UC) luminescence properties of phosphor Tm3+/Yb3+ co-doped Gd2Mo3O9were investigated in detail. Tm3+/Yb3+ co-doped Gd2Mo3O9was prepared by solid-state reaction method using Na2CO3 as flux and characterized by powder X-ray diffractometry. Under 980nm excitation, Tm3+/Yb3+ co-doped Gd2Mo3O9has exhibited a weak red emission near 651nm and strong blue emission at 476nm. Tm3+/Yb3+ co-doped Gd2Mo3O9phosphor has been considered as a better candidate in solid-state lighting applications.
Synthesis of SiO2/CeO2 Nanopaticles with Core/Shell Structure and Their Polishing Performance
Authors: Mu Li Juan , Zhang Zhong Yi , Zhang Li Ye , Chen Chuan Dong , Zhao Zeng Qi
Published: April 2013

CMP is commonly recognized to be the most effective technique of achieving global planarization. SiO2 and CeO2 abrasives are the most commonly used in CMP slurries due to their good polish performance. To consider respectiveSubscript text advantages and synergistic effect, preparation of SiO2/CeO2 composite nanoparticles with core/shell structure have become a hot topic in CMP field. We introduced the preparation technology of SiO2/CeO2 and their applications in CMP in recent years.
Synthesis and Electrochromic Properties of Crystalline 3D Urchin-Like Nanostructures
Authors: Jung Jin Joo , Kim Do Hyung
Published: April 2013

Novel 3D (three-dimensional) urchin-like WO2.72 nanostructures were prepared by a template-free hydrothermal synthetic route using W(CO)6 and ethyl alcohol reagents. The detailed morphology and crystallinity were dependant on the synthesis temperature and synthesis time. The potential use of WO2.72 nanourchins as a cathode electrode for electrochromic devices was assessed. The WO2.72 electrochromic films exhibited a rapid switching response time (coloring time ~5 s, bleaching time ~1.6 s), outstanding high coloration efficiency (~116 cm2/C), and durability in an acidic electrolyte. This performance was attributed to the high diffusion coefficient [~6.43×10-9 cm2/s (in the intercalation)] of the urchin-likeWO2.72 with a high surface area to volume ratio and high crystallinity
Solvothermal Synthesis and Detailed Analysis of Hydroxyapatite Nanostructure
Authors: Nathanael A. Joseph , Lee In Ho , Lee Kap Ho , Hong Sun Ig
Published: April 2013

Hydroxyapatite (HA) nanostructures may be an advanced candidate in biomedical applications for an apatite substitute of bone and teeth than other form of HA. In contrast, well-defined size and shape control in synthesizing HA nanostructures is always difficult. Solvothermal synthesis method was adopted to prepare highly ordered hydroxyapatite nanostructures. The morphological analysis by FESEM confirms that the preparation conditions greatly influences the morphological characterization. X-ray Diffraction (XRD) measurements indicate the formation of crystalline hexagonal hydroxyapatite. The crystillinity of HA decreased with increasing ethyline glycol.
Coordination of Polyacrylic Grafted Polytetrafluoroethylene Fiber with Fe (III) Ions in Aqueous Solution
Authors: Li Bing , Dong Yong Chun
Published: April 2013

The grafted polytetrafluoroethylene (PTFE) fibers were prepared with acrylic acid and then coordinated with Fe (III) ions. The effect of initial Fe (III) ion concentration and temperature on coordination process was investigated. In addition, the kinetics of the coordination process was also evaluated. The results indicated that increasing initial Fe (III) concentration and temperature significantly improve the amount of Fe (III) ions coordinated onto the fiber. The coordination between them can be described by Langmuir and Freundlich isotherm equations. On the other hand, coordinating process also follows a pseudo-second order model. Moreover, a higher initial Fe (III) ion concentration gives rise to an enhanced initial Fe (III) ion coordination rate.
Design, Synthesis and Biological Activity Evaluation of Novel N-Acylation Substituted Isatin Derivatives
Authors: Zeng Bin , Zhu Xiao Hua
Published: April 2013

Isatin, an endogenous compound existent in many organisms, shows a wide range of biological activities. In this paper, we like to report the design and synthesis of several isatin derivatives through the acetalization and N-Acylation. Six newly synthesized compounds were characterized on the basis of 1H NMR, and those compounds were determined using two different human cancer cell . Anti-cancer activity showed those compounds IC50＜50 μm.
Molecular Dynamics Simulation of Structural Changes of Ag965 Clusters during Freezing
Authors: Xia J.H. , Cheng Zheng Fu , Xiao Xu Yang
Published: April 2013

The structural transitions of Ag965 clusters during two different quenching processes (Q1:1.0×1014 K/s, Q2: 1.0×1012 K/s) were studied using molecular dynamics simulations. This work gives the structure properties including the variations with temperature of pair-correlation function, bond-angle distribution function, bond pairs and bond orientational order parameters in both rapid quenching processes. Our results indicated that the liquid Ag965 was frozen into amorphous structure at 100 K under the quenching condition Q1. While the liquid Ag965 transformed to hexagonal close-packed (hcp) phase at the temperature 100 K under the quenching condition Q2.These instructions give you basic guidelines for preparing papers for conference proceedings.
Analysis on the Non-Arrhennius Life Prediction Method of Rubber
Authors: Wang You Shan , Wang Wei , Liu Qiang , Cui Zhi Bo , Wang Jun
Published: April 2013

In the present paper, butadiene rubber is analyzed. The activation energy variation of butadiene rubber material has been studied and found that non-Arrhenius behavior. On this basis, the life prediction model of the rubber sealing material has been established, in which the activation energy is the characterization parameters. The storage lifetime of the conducted rubber seal material has been calculated. Under the same conditions, the storage lifetime are 7 years, while according to the GB the storage life are 20.25 years, with comparing the actual storage of the material life of 3-5 years, could prove more accurate modeling and prediction methods established in this study. This would provide a theoretical basis for more accurate life prediction of rubbers.
Study on the Flow- Induced Corrosion of P110 Oil Tube with an Electrochemical Method
Authors: Wang Zhi Guo , Li Zhen , Liu Xiao Yan , Dou Yi Hua
Published: April 2013

P110 Steel Flow-induced corrosion Electrochemical Method Abstract. Electrochemical measurements have been used to investigate the flow-induced corrosion behaviors of P110 oil tube in 3.5wt% NaCl solution. The corrosion rates were calculated by linear polarization resistance method and weak polarization method respectively. The results demonstrated that corrosion rate of P110 steel increases sharply with the flow velocity increase when the impact angle is 30°, but it reach the first plateau when the fluid velocity changes from 5.6 m/s to 7.8 m/s and the corrosion rate increases sharply again when the velocity beyond 7.8 m/s. After that, corrosion rate decrease when the velocity is more than 10.0m/s. It is demonstrated that the corrosion rate of steel P110 is controlled by cathode reaction of oxygen diffusion in the 3.5 wt % NaCl solution when the flow velocity is over 10.0m/s.
Research Status and Prospect of Constitutive Relation for Concrete after Freeze-Thaw Damage
Authors: Xu Jing , Tian Bin , Xu Gang , Lu Xiao Chun
Published: April 2013

Frost resistance is one of the most important indexes of concrete durability, therefore it is essential for the research of constitutive relation for concrete after freeze-thaw damage. The constitutive relation for concrete is directly related to the rationality and security of the structural design. The existing research mainly includes experimental and theoretical simulation, and has made several progresses. Based on the summary of the existing constitutive relation for concrete after freeze-thaw damage, this article puts forward its own idea on the development tendency. And it provides reference for the further study of the constitutive relation for concrete after freeze-thaw damage.
Flex Fatigue of Side Emitting Optical Fiber
Authors: Huang Juan , Kremenakova Dana , Militky Jiri
Published: April 2013

Side emitting plastic optical fibers can be used in textile structures for some special optical activities due to the light leaking out from their surface. One significant characteristic of plastic optical fibers is their tendency to weaken side emitting capability under mechanical deformation, which can be simulated as repeated bending cycles under prescribed pretension. The principle of evaluation of flex fatigue was based on the repeated bending cycles until break. Q-Q plot and three-parameter Weibull distribution were used for estimation of numbers of bending cycles of plastic optical fibers with different diameters. The relationship between flex fatigue and flexibility were analyzed and compared with logarithmic values.