bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Research on Static Behavior of Stiffened Square Concrete-Filled Steel Tubular Columns Subjected to Axial Load
Authors: Yang Yuan Long , Zhang Jing Shu , Wang Yu Yin
Published: March 2013

Square concrete-filled steel tubes (CFSTs) are gaining increasing usage in modern construction practice, offering improved mechanical properties and increased material efficiency compared with the individual steel and core concrete components. However, the cross-section slenderness of the encasing steel is, although more inflexible than a comparable hollow steel tube, restrained due to local buckling. A number of innovative kinds of reinforcement stiffeners have been put forward particularly for the square CFSTs with slender sections of encasing steel. To investigate the mechanical effect of the reinforcement stiffeners and compare them with traditional ones in practice, four square CFSTs welded with various reinforcement stiffeners and one reference CFST have been tested, and are presented in this paper. The mechanical behaviors such as the resistance, ductility and failure mode investigated during the test were also studied in the theoretical research, which was carried out to predict and summarize the comprehensive properties of the specimens.
Structural Strength Analysis of FRP Yacht by FEM
Authors: Ye Yong Qing , Chen Chao He , Liu Xiao
Published: March 2013

This paper discusses the laminated structure and sandwich structure by finite element modeling, the process of finite element modeling of composite panel with top-hat stiffeners and finite element analysis of the whole hull. The result shows that the method and steps of modeling FRP yacht based on FEM to directly calculate the hull structural strength are instructive.
Application of Prestressing Technology for Strengthening Space Grid Structure
Authors: Qiao Zi Long
Published: March 2013

In a grid renovation project, the use of prestressed reinforcement technology, using SAP2000 software analysis, puts forward the reinforcement scheme, so that the grid to meet the use requirements.
Dynamic Load Test Analysis for Continuous Steel Bridge
Authors: Ma Min Jing
Published: March 2013

Bridge dynamics is an important topic in the development of the modern Bridges. It not only can reflect the mechanical performance of the bridge structure under the action of vehicle load, but also reveals system influences on the bridge structure under seismic action. But in order to supplement the shortage of the pure theoretical mechanics model, we need to do some tests to improve the research that is also the most reliable method. Illustrated by the example of a viaduct (continuous steel box girder-bridge) in Taiyuan, the testing span is loaded and tested. We analyze the structure using the bridge calculation common software Midas. The existing Bridge in dynamic test loads is analyzed to research that if their vibration characteristics and dynamic response and dynamic performance can meet the requirements of normal use.
Second-Order Effects of Shanxi Tall Steel Framework Sway
Authors: Kang Ting Ting
Published: March 2013

Structure in horizontal wind load produce lateral displacement, vertical load may have caused additional effects due to the lateral displacement and deformation of the cumulative increase leads to structural instability collapse. Due to the characteristics and problems of the structure, utilizing SAP2OOO finite element software, this paper consider the deformation of the lateral displacement of the second-order effects under wind loads and loads of the Shanxi Taiyuan Xiaodian a tall steel frame structure.
Singularity Analysis for Plane Tri-Material Junctions
Authors: Tian Shu Ai , Wu Zhi Xue
Published: March 2013

Stress singularities exist on the interface endpoint or internal point, consisting of dissimilar linear elastic bonded wedges. The eigenvalue λ is an important parameter to represent the stress singularity on the interface singular point. And smaller eigenvalue represent stronger stress singularities on the interface singular points. The angular function is another parameter to represent stress singularities around singular points. It is known that the eigenvalue is influenced by the Young’s modulus, Poisson’s ratio and interface angles. The Airy stress eigenfunction method has been used to solve the eigenvalue on the bi- and tri-material junctions by verifying the Young’s modulus. And then talk about angular functions around the bi- and tri-material junctions’ singularity point. At last discuss the feasibility of enhancing the interfacial bonding strength in engineering practice.
A Finite Element Method with Six-Node Isoparametric Element for Nonlinear Analysis of Cable Structures
Authors: Wang Yang , Zuo Sheng Rong , Wu Chong
Published: March 2013

This paper applied nonlinear elastic theory to the cable structures, presented a finite element method with six-node isoparametric element, used the polynomial of degree five as displacement functions and initial curve of the element. Assuming the cable to be ideal flexible, by means of Lagrangian method, the finite element equations has been derived, so can use this method to compute cable structures.
Monitoring and Evaluation on Girder Alignment of Suspension Bridge Based on MATLAB
Authors: Yang Xia Lin , Wei Guo Xiang , Zhang Wei
Published: March 2013

In order to find out a new way to get the principles of the main girder alignment long-term changes and estimate the technology level, the main girder alignment variation was monitored by the real time monitoring system. Then the monitoring data was analyzed depend on the assessment theories which based on the statistical characteristics of the monitoring data. For the large amount of collection data, the convenient of monitoring data and fast processing could be realized by using the Matlab programming software. The analysis results show that the assessment theories can well realize the girder alignment evaluation; the main girder in the monitoring period shows a small alignment changes, girder technology level is in a good condition.
Research on Large-Scale Structure Analysis Considering Time Effect and Route Effect (II): Engineering Example
Authors: Gu Wei , Xiong Xue Yu
Published: March 2013

Taking an large-scale PC frame structure as example, the Finite Element simulation of structure construction procedure are performed, prestressing restraint effect, seasonal temperature variation and concrete shrinkage & creep effects are considered. The results show that the displacement and interior force of structural members can be significantly influenced by taking different construction procedure.
Finite Element Analysis on Orthotropic Deck with Composite Pavement Layer
Authors: Zhu De Rong , Yang Zi Jiang , Zhang Hui , Liu Shi Zhong , Ning Gui Xia
Published: March 2013

Orthotropic steel deck; Shear nail; Steel fiber concrete pavement layer; Stress analysis. Abstract. Aiming at the optimization design of composite pavement on orthotropic deck in a streamlined steel box girder with lager wide-to-span ratio, finite element analysis is taken under various loads supplemented with static model; the stress distribution is analyzed in each part of the pavement layer. The theoretical results show that the deck of the bridge displays obviously orthotropic features; shear nails with reasonable density can increase the binding capability of each part of deck pavement and overall mechanical performance. It can be concluded that the service life of the deck pavement can be extended by the use of steel fiber concrete layer.
A Study of the Relationship between Fabric Property and Clothing Pressure of Knitted Underwear
Authors: Xia Lei , Yin Ling , Zhang Yan Fei
Published: March 2013

The objective of this study was to investigate the relationship between fabric property and Clothing Pressure of knitted underwear, using objective pressure evaluates method. Eight kinds of fabric for knitted underwear were tested on the stretching property and elasticity property, and then eight same style of underwear which were made by Eight kinds of fabric were tried on by pressure dummy. Clothing pressure of seven different points was measured and recorded. The linear relationship between fabric property and Clothing Pressure of knitted underwear was obtained. Results showed that Clothing Pressure of knitted underwear was negative correlation with elastic recovery rate of knitted fabric, and was positive correlation with tensile stretch rate.
Analysis on the Mechanical Behavior of the Pile Base of Integral Abutment Skew Bridge
Authors: Chen Chao Wei
Published: March 2013

Ansys, the large-scale general FE program, was used to establish computational models of 3×16m-long integral abutment skew bridge with different skew angle to analyze the mechanical characteristics of pile base under the temperature load. Through the analysis of parameters, some helpful conclusions, which would pave the way for further exploration on mechanical behavior of integral abutment skew bridge, were reached.
Nonlinear Finite Element Analysis of Adaptive-Slit Shear Walls
Authors: Yin Ying Ying , Chu Ming Jin
Published: March 2013

In order to further study the mechanism of adaptive-slit shear walls under horizontal loads, and facilitate it better applied to practical engineering. On the basis of experimental studies, the ABAQUS finite element analysis software is used to establish the finite model of adaptive-slit shear. The finite element model accuracy is verified by comparing the model and test results. A validated model is used to study the mechanical property of adaptive-slit shear walls under monotonic loads.
The Two-Stage Design Method of Isolated Structures Based on New Code for Seismic Design of Buildings
Authors: Zhang Qiang Qiang , Pan Wen , Sun Bai Feng
Published: March 2013

Two-stage design method for base isolation structures includes simplified estimation and time history analysis. Simplified estimation is used in preliminary design stage for estimating the weight and the first period of an isolated structure, the upper structure is simplified as a SDOF system. According to the expected response reduction goals and response spectrum, the first period of the isolated structure, stiffness of isolation device and number of isolation bearing can be induced. Time history analysis is employed in detail design stage, for determination and optimization of isolation device based on current standards. The author has made it realized based on the old Seismic Code. As there are some changes of provision on base isolation analysis in new code, including the value of bearing stiffness and safety factor, etc., the method mentioned above should be updated. Numerical investigation shows that for regular multi-storey frame structures, the difference of the maxium ratio of floor shear between the old and new Seismic Code increase with fortification intensity.
Research on Corrosion Resistance Properties of Post-Tensioned Prestress Duct Grouting
Authors: Feng Xiao Wei , Wang Yong
Published: March 2013

The corrosion resistance of post-tensioned prestress grout is considered an important indicator to structural safety and durability, based on some current specification on slurry anti-corrosion requirements of prestressing tendons at home and abroad, through laboratory accelerated corrosion test this paper mainly analyzes the diffusion way of harmful substances in the slurry, the relationships between rust time and prestressing tendons protective layer thickness, and then according to selected materials with different proportions have different corrosion time, take QL + ZQ is the best choice in anti-corrosion.
Numerical Simulation of Intra-Explosion in Multilayer Medium
Authors: Wang Shu You , Jiang Jian Wei , Men Jian Bing , Kang Yan Long
Published: March 2013

Numerical simulation of intra-explosion in multilayer medium is computed by using of AUTODYN-2D code based on TCK subroutines. To investigate phenomena of conical crater damage in multilayer medium, the intra-explosion efficiency law of different weight and depth of explosive charge is studied, and relation of explosive weight and detonation depth with thickness of cover medium is modeled to predict the optimal detonation depth.
Effect of Random Material Parameter in the Shell Structures
Authors: Noh Hyuk Chun
Published: March 2013

The random nature of structural parameters is to affect the behavior of the structure which cannot be detected in the context of deterministic analyses. Taking into account the randomness in the material parameter, we evaluate probabilistic behavior of the shell structures made of isotropic material. Specifically, the elastic modulus is taken to be random since the parameter plays an utmost important role in the behavior of structures. The results of the proposed scheme are compared with those based on Monte Carlo simulation. It is observed that the proposed scheme is in good agreement with the MCS, which shows the adequacy of the proposed scheme.
Seismic Response Analysis on RC Frame Strengthened with Viscoelastic Damper
Authors: He Jian Ping , Wang Ya Li , Liu Yong
Published: March 2013

In this paper,time-history analysis comparison of different parts of the displacement on eight floor three span Frame Strengthened with viscoelastic damper under the action of EI Centro earthquake wave .The results indicate that setting viscoelastic damper Strengthened structure can well inhibition Seismic response function, reducing the earthquake response of the structure,decreasing amplitude are relatively obvious, achieving a better seismic condition, meeting the needs of the standard, it is a kind of performance very good seismic energy dissipation strengthening methods.
An Unstructured Moving Grid Scheme for Shock Impacting on Material Interface
Authors: Wang Bing , Si Hai Qing
Published: March 2013

An unstructured moving grid scheme is applied to track the real-time motion state of the material interface with large-scale deformation induced by shock in the compressible multi-material flow. The material interface is denoted as a special internal boundary which is made up of unstructured grid edges, and on both sides of that there exist grids used for the two different materials. Riemann problem is solved in order to track the motion of the grid points on the material interface, and the local re-meshing technique is also applied to cope with the large-scale deformation of the moving grids near the interface, especially for the case of strong shocks existing in the multi-material flows. Simultaneously, the material interface is also defined as a kind of grid-deforming boundary in case grid volumes are negative. To obtain the resolution of the whole multi-material flow domain, the arbitrary Lagrangian-Eulerian (ALE) is discretized using Harten-Lax-van Leer-Contact (HLLC) scheme. Several numerical calculations from shock-interface examples demonstrate that this moving grid technique is feasible and effective in tracking the real-time motion state of the material interface.
Effect of Ground Motion Characteristics on Seismic Response of Large Span Bridge
Authors: Liu Hai Ming , Tao Xia Xin , Wang Liang , Tian Shou Long
Published: March 2013

Result of seismic response analysis of a large span cable based bridge with inconsistent inputs is presented in a conjugated paper and is further deal with in this paper. The results from synthesized motions for the same earthquake source and same distance to the rupture show a large difference. They are compared with characteristics of the inputs in this paper. The effect of the motion amplitudes and the coherency between the input motions at the two ends of the main girder on the maximum response displacements and internal forces are pointed out.
Frost-Heaving Pressure on Lining of Tunnel Constructed in Severe Cold Regions
Authors: Deng Gang , Wang Jian Yu , Zheng Jin Long
Published: March 2013

A 3D water contained space model for calculation of frost-heaving load on lining is presented in this paper. After the calculation and analysis some key points on characteristics of frost-heaving pressure up on lining of rock tunnel constructed in severe cold regions are concluded.
A Mathematical Model for the Pipeline Transportation of Soft Clay
Authors: Zhu Wan Zhen , Wu Shu Hui , Tao Song Lei
Published: March 2013

We have found a way of a pipeline transportation of soft clay in order to overcome the difficulties to transport soft clay so that the long distance transportation of soft clay becomes true in Engineering. By analyzing the properties of soft clay and pipeline transportation, the rules of decreasing energy through the pipeline transportation, and the characters of flow field with gas, liquid and mud, we have obtained a mathematical model for the pipeline transportation of soft clay. The model not only builds up a theory for the non-continuous soft clay column pipeline transportation techniques but also leads to further developments and wider applications of the pipeline transportation of soft clay.
Analysis of Fissured Expansive Soil Slope Stability and its Reinforcement with Anti-Slippery Piles
Authors: Sun Hui , Hu Bo , Zhang Guo Qiang
Published: March 2013

Fissure is one of the most important characteristics in expansive soil. It’s an important factor affecting slope stability in the expansive soil area. With the study of expansive soils typical channel slope fissured characters in the South-to-North Water Diversion Project, different impaction on slope stability such as location and inclination of the fissure are analyzed. By using the limit equilibrium method, the stability of expansive soil slope is analyzed; the most adverse condition of expansive soil slope is concluded. Then anti-slippery pile reinforcement in expansive soil channel slope is studied by using finite difference method. The research is of great significance to the construction and reinforcement of expansive soil slopes in South-to-North Water Diversion Project.
Analysis of the Deformation Field in the Direct Shear Test with Use of DPDM
Authors: Zhang Jie , Liu Wen Bai , Su Li Juan
Published: March 2013

To study the deformation of soil when interacting with structure, this paper macroscopically analyzes sand deformation field through the direct shear test with sand and steel plate. The test used the invisible semi-model shear device to take photo of experimental process for analysis by digital photography-based deformation measurement(DPDM) technique. The results show that during the process of interaction between dense sand and structure, the influence made by normal stress is more significant than that of compactness. As the normal stress grows, the compactness, the maximum shear stress and the bulk strain of medium sand correspondingly increases. At the beginning of shear, sand far from the plate displays shear shrink while sand close to the plate shows partial shear dilatancy.
Research of Embankment Dam Structural Safety
Authors: Ding Xiu Ying , Zhang Ya Kun , Zhang Di
Published: March 2013

A concrete embankment dam, for example, to run for the water control dam for many years conducted a vertical displacement, horizontal displacement data analysis and research; and the review of the dam slope stability, structural stability of the main dam crest review, analysis and research of the results,give the conclusion of the reasonable evaluation. Provide reference for the safety evaluation about the aging and dangerous water Construction.
The Seismic Analysis of an Exhibition in Shanxi
Authors: Lv Zhao
Published: March 2013

In order to quantify the goal of earthquake-proof, such as minor earthquake, earthquake repair and earthquake does not fall, the project will analyze the seismic performance in three stages according to the sub-structure of small earthquakes, moderate earthquake, large earthquake. First, in the small earthquakes stage the method of MIDAS finite element analysis software will be used to calculate and analyze, meanwhile, the method of flexible schedule analysis will be as a supplementation to seismic checking. Second, in the stage of moderate earthquake, the data is calculated by adjusting the corresponding parameter values. Third, in the large earthquake stage, Pushover Analysis will be adopted. The aim is to identify weaknesses and to propose corresponding seismic measures in the structure by the Seismic performance analysis.
Study on the Supporting Method of Crossheading in Shallow-Buried Coal Seams Working Face Using FLAC Simulation
Authors: Luo Jian Feng
Published: March 2013

Taking 1403 coal face of Fengjia coal mine in northern Shaanxi as background, put forward three supporting schemes of crossheading according to different buried depth and coal seam interval. Applying FLAC software, established relevant calculating model, analyzed the stress field and surrounding rock deformation caused by shallow seam mining before and after supporting. Combining the result from site monitoring, obtained the deformation law of crossheading surrounding rocks in the short distance seam: the vertical deformation is the main deformation under the A support scheme. The field tests showed that: the supporting schemes according to the section of crossheading is feasible and it ensured haulage gate roadway’s surrounding rocks stability , met the requirements of safety production in the coal mine, the supporting schemes of crossheading proposed in this paper has reference value to similar project.
Chronology Research on Eocene Trachyte in Zoumaying, Sanshui Basin
Authors: Wei Zhang , Fang Nian Qiao
Published: March 2013

Trachyte in Zoumaying was erupted in Eocene by 40Ar-39Ar age-dating in previous studies. Multielement Geochemistry analysis and U-Pd radiochronology were introduced on zircons from trachyte in Zoumaying in this paper. The SiO2 and K2O+Na2O contents of trachytes vary between 58.59% to 68.99%, and 10% to 11%. About twenty zircons were selected from trachyte sample with fractures and zonal structure, and most of them were inheritable magmatic zircons. The result of radiochronology on zircon is 60Ma which is similar with the former result as 53.2±0.2Ma.
Semi-Geodesics-Based Dome Design for Filament Wound Composite Pressure Vessels
Authors: Zu Lei , He Qin Xiang , Shi Jun Ping
Published: March 2013

In this paper we apply semi-geodesic trajectories to the creation of isotensoid domes for filament wound pressure vessels. The governing equations for the determination of the meridian shapes and related winding angle distributions of domes are derived using the netting analysis and the semi-geodesic winding law. The effects of the slippage coefficient on the geometry and fiber trajectories of the domes are respectively evaluated in terms of the resulting meridional curves and fiber angles. It is revealed that the semi-geodesic angles and the dome depth have an overall decrease with increasing the slippage coefficient. The results also demonstrate that the use of semi-geodesics significantly enlarge the design space for the geometry and adapted fiber trajectories of the domes. The present method can provide a significant reference for the design and production of the domes for semi-geodesically overwound pressure vessels.
Effect of TiC Intermediate Layers on the Thermal Conductivity of Copper/Diamond Composites
Authors: Kang Qi Ping , He Xin Bo , Ren Shu Bin , Jia Bao Rui , Qu Xuan Hui
Published: March 2013

TiC intermediate layers were formed on the surface of diamond particle with reaction of Ti powders in mixed molten NaCl-KCl salts. The copper/diamond composites with TiC-coated diamond particles were fabricated by pressure infiltration. Then the microstructure and thermal conductivity of the obtained copper/diamond composites were studied. The results showed the thermal conductivity of the composites with a density of 5.65 g/cm3reached 514 Wm-1K-1, which is much higher than with uncoated diamond. The TiC layers synthesized on diamond particles is shown to be an effective way to enhance the thermal conductivity of copper/diamond composite.
Study of a Sound Absorbing Polyurethane Based on Porous Composite Material
Authors: Zhang Xin Liang , Liu Cun Ping
Published: March 2013

A new type of sound absorbing material, which was made from super strength polyurethane and mass fiber, was investigated. And the sound absorption coefficient of the material was tested by standing wave tube method. Experiment results manifested that content of glass fibers, blowing agent and thickness have great effects on the sound absorbing performance of the sample. When the content of glass fiber and blowing agent are separately 3% and 0.4%, the performance of the material reaches optimum. The noise reduction coefficient of the material is 0.6, and the sound absorption property at middle-low frequency is good.
Detection of the Intermediates in Preparation of Ammonium Polyphosphate by Temperature Raising Rate Factor
Authors: Liu Yue Long , Liu Gou Sheng
Published: March 2013

Detection of intermediates is the general way to investigate a reaction mechanism, because the intermediates connect the reactants and the products, the intermediates can reflect some internal relationships between the reactants and the products. By studying the the structures of intermediates, the reaction process and reaction mechanism can thus be understood. Ammonium polyphosphate (APP) is an effective material as halogen-free flame retardants, it has six crystalline forms.In preparation of APP, the factor of temperature raising rate is investigated, some intermediates are detected, the XRD spectra of these intermediates are discussed. The results are informative for controllable preparation of APP in industrial production.
Comparison of the Flame Retardant Properties of Ammonium Polyphosphates with Crystalline Forms II and V
Authors: Liu Yue Long , Liu Gou Sheng
Published: March 2013

Ammonium polyphosphate have six crystalline forms, of them, form I and form II have industrial uses, their flame retardant properties have been studied extensively. Form V is seldom studied, its flame retardant is not fully known. In this paper, the flame retardant effects of ammonium polyphosphate with crystalline form II (APP-II) and crystalline form V (APP-V) in polypropylene were tested. Results show that the flame retardant effect of APP-V is better than APP-II, and has better mechanical strength that APP-II, meaning it should has a good market perspective in field of halogen-free flame retardation.
Wear Process and Analysis of Lubrication Failure about Sputtering MoS2 Composite Solid Films Applied to Spacecraft
Authors: Wan Zhi Hua , Zhao Yun Ping , Cai Miao Miao , Zhou Hui , Hu Han Jun , Zheng Jun
Published: March 2013

The solid MoS2composite films which were doped with Sb2O3were investigated by means of UMT-2 tribometer. The worn surface morphology of balls and discs during different worn phases were measured on a high resolution microscope. The main chemical elements S,Mo in the worn surface were analyzed with PHI-5720 XPS. The worn areas of discs during different worn phases were measured with the aid of a nano scratch meter(CSM,Switzerland) .The results showed that the MoS2/Sb2O3composite films had better oxidation resistance properties and longer wear-life(6.5×105r).The model of contact between the ball and its counterpart (steel disc) was converted into flat contact during the wear test. The MoS2transferred from discs to the surface of the balls helped to contribute their longer wear-life. Continually accumulated wear at the interface between balls and their respective counterpart discs resulted in their lubrication failure, and the accompanying oxidation of MoS2occurring partially accelerated lubrication failure of the solid MoS2composite lubrication films.
Formulation and Evaluation of Novel Starch-Based Microspheres for Adsorption of Ascorbic Acid
Authors: Yu Li Li , Yang Li Yan , Yao Lin
Published: March 2013

The microspheres(SBM) was prepared using N, N'-methylene-bis-acrylamide (MBAA) as cross-linker and K2S2O8-Na2SO3 as initiator in water-in-oil emulsion. And then the effects of the O/W ratio (v/v), the amount of cross-linker and the amount of K2S2O8-Na2SO3 on particle size and swelling ratio were investigated. An increase in particle size was observed by increasing the amount of cross-linker and the amount of K2S2O8-Na2SO3, while with decreasing the O/W ratio and the amount of K2S2O8-Na2SO3 particle size was found to decreased, which was just opposite to the trend of swelling ratio. Particle size of the microspheres is 12-65μm. Ascorbic acid was selected as a sample drug, and the function between ascorbic acid and SBM was illustrated by the three-electrode equipment. The absorption mechanism suggested that the absorption of ascorbic acid on SBM is exist and ascribes to hydrogen bond for－OH and－NH2 of SBM and －OH of ascorbic acid.
Growth and Microstructure of Submicro-Scaled Graphitic Flakes on Carbon Fibers by Catalytic Chemical Vapor Deposition
Authors: Zhang Hai , Guo Ling Jun , Fu Yang Xi , Li He Jun , Li Ke Zhi
Published: March 2013

Submicro-scaled graphite flakes with uniform distribution on the surface of carbon fiber were grown in situ by catalytic chemical vapor deposition with natural gas as feedstock. Morphology and structure parameter of graphite flakes were characterized by scanning electron microscope and Raman spectroscopy respectively. The results show that graphite flakes with assistance of iron hydroxide aqueous collosol had better shape, higher density and graphitization degree compared with specimen prepared with ferric chloride solution. The size in plane of as grown graphite flakes is in the range of 1-3 μm. Microcrystal domain size of graphite flakes is calculated about 5 nm according to ration of intensity of D band to G band in Raman spectra.
Synthesis and Characterization of Neodymium Zirconate Nanocrystals Doped with Aluminium Ions by a Salt-Assistant Combustion Method
Authors: Bai Yun Shan , Shao Rong , Lu Lu De , Bao Jian Chun
Published: March 2013

Neodymium zirconate nanocrystals doped aluminium ion NdxAl2-xZr2O7 with pyrochlore structure were prepared by a salt-assistant glycine combustion method. Zirconium nitrate, aluminium nitrate and neodymium nitrate were used as chemicals, and glycine was used as burning agent. The as-prepared NdxAl2-xZr2O7 nano-crystals were characterized by XRD, FT-IR, TEM and HRTEM. The results showed the Nd ions can be partially replaced by Al ions. For crystalline Nd1.9Al0.1Zr2O7, there are four strong diffraction peaks at 2θ = 29.02°, 33.70°, 48.37° and 57.37° corresponding crystal faces are 0.308nm, 0.266nm, 0.188nm and 0.161 nm, respectively, which indicates that the interstices of corresponding crystal faces are smaller than that of Nd2Zr2O7. Furthermore, the fluorescent properties of Nd1.9Al0.1Zr2O7 nano-crystals evaluated by the fluorescence spectra indicate that the prepared nano-crystals are a kind of potential fluorescent-emitted material.
Influence of RE Elements on Corrosion Rust Layer of Low Carbon Steel in CSP in Simulated Coastal Atmosphere
Authors: Li Tao , Qin Meng , Zheng Hui , Jin Zi Li , Ren Hui Ping , Li Wei Xiao
Published: March 2013

The influence of RE on corrosion rust layer of low carbon steel in CSP in a simulated coastal-industrial atmosphere was investigated by weight loss, SEM, XRD, and electrochemical measurements. The results demonstrate that the corrosion rate of low carbon steel in CSP with RE is higher at the initial stage and then lower in the late stage than that of samples without RE, which is caused by the formation of a compact and continuous rust layer with the addition of RE. The relative content of α-FeOOH and Fe3O4 in rust increased in the low carbon steel with RE indicates an improved protective ability of the rust. Using the analysis of resistance, the EIS results also indicate that the enhancement of protective ability of the rust layer by the RE is the main reason for increasing corrosion resistance of low carbon in CSP in simulated coastal atmosphere.
Experimental Study on the Forming Limit Diagram of QP980 under Variable Pressing Velocities
Authors: Ding Lei , Lin Jian Ping , Pang Zheng
Published: March 2013

QP steel has great application potential for automotive industry for its ultrahigh strength and good plasticity. In this paper, the forming limit diagram (FLD) of QP steel was experimentally studied using spherical punch test. The forming limit curves (FLC) of QP steel in room temperature under two pressing velocities (20mm/s, 2mm/s) were obtained. It has been found that the deformation velocity affects the FLC obviously; the FLC declines with the increase of pressing velocity. Compared with other AHSS under the same strength grade, QP steel keeps high strength without a significant loss of plasticity.
Effect of Tungsten Addition on Microstructure and Mechanical Properties of TiAl-Based Alloy
Authors: Sun Hong Liang , Huang Ze Wen , Zhu De Gui
Published: March 2013

The effect of different tungsten addition on microstructure and mechanical property of TiAl-based alloy was investigated. The results indicate that the size and amount of β (B2) phase and equiaxed γ phase gradually increase with increasing content of tungsten. The grain size and lamellar spacing obey a parabolic law. The tungsten addition can increase the room temperature strength, high temperature strength but have a little effect on the ductility. The creep rupture life has inverse correlation relationship with the content of tungsten.
Preparation of Bromine Carbon Alkyd Resin Retardant Coatings for Steel Structure
Authors: Cui Jin Feng , Chen Bi Bi , Guo Jun Hong , Zhou Ying Ping , Yang Bao Ping
Published: March 2013

Bromine carbon alkyd resin was synthesized with soya oil acid, pentaerythritol, phthalic anhydride and brominated epoxy resin as materials under the condition which reaction temperature for 200 °C, usage of catalyst was 0.1% and period of esterification reaction lasted 3 h. And then bromine carbon alkyd resin retardant coatings for steel structure was prepared using bromine carbon alkyd resin as binder which compounded with flame retardant additives through stirred, grinded and dispersed homogeneously. Resin and coatings were analyzed by infrared spectroscopy and TG-DSC. The optimal formula of bromine carbon alkyd resin retardant coatings for steel structure was achieved through testing impact resistance, adhesive force, hardness, gloss, drying time and fire resistance time of film.
Study on Effect of Cycle Counting Correction Factors in Spectral Based Fatigue Computation
Authors: Shehzad Khurram , Huilong Ren , Khan Rehan , Khurram Asifa
Published: March 2013

This paper investigates the effect of various cycle counting correction factors in spectral fatigue damage calculations. Spectral fatigue calculations are based on complex stress transfer functions established through direct wave load analysis combined with stress response analysis. Cycle counting correction factors are introduced in the computation process to cater swell’s effect and to reduce the conservatism in the results due to narrow band approximation for a wide band random process. In this study, fatigue life of a ship structural detail is predicted by spectral method utilizing ANSYS software along with 3D liner sea-keeping code AQWA. Cumulative fatigue damage is calculated by a MATLAB program based on direct calculation procedure of spectral fatigue using cycle counting correction factors proposed by Wirsching, Rice and Dirlik. The results show an overall decrease in the computed fatigue damage and a corresponding increase in the expected fatigue life of the structure.
Substrate Temperature Effects on the Structural and Optical Properties of TiO2-Doped ZnO Films for Organic Photovoltaic Devices
Authors: Zhang T. , Zhong Z.Y. , Zhou J. , Sun F.L.
Published: March 2013

TiO2-doped ZnO thin films with highly (002)-preferred orientation were grown on glass substrates by RF magnetron sputtering. The effect of substrate temperature on structure and optical properties of the films were investigated by X-ray diffractometer and spectrophotometer. The results show that the polycrystalline TiO2-doped ZnO films consist of the hexagonal crystal structures with c-axis as the preferred growth orientation normal to the substrate. The substrate temperature significantly affects the crystallite size and optical transmittance of the deposited films, but slightly influences the refractive index and optical bandgap of the deposited films. The TiO2-doped ZnO film grown at substrate temperature of 470 K possesses the maximum crystallite size, an average transmittance of 76.2 % in the visible light range, and an optical bandgap of 3.46 eV.
Research on Accumulation PMOS Capacitors Based on Strained-Si/SiGe Material
Authors: Wang Bin , Zhang He Ming , Hu Hui Yong , Zhang Yu Ming , Shu Bin , Zhou Chun Yu , Li Yu Chen
Published: March 2013

This paper presents a physical-based model for accumulation PMOS capacitor based on strained-Si/SiGe material. With this model, the physical mechanism of the “plateau”, observed in accumulation region of the C-V characteristics of the strained-Si(SSi)/SiGe PMOS capacitor, is studied. The results from the model show excellent agreement with the experimental data. The proposed model can provide valuable reference to the strained-Si device design and has been implemented in the software for extracting the parameter of strained-Si MOSFET.
Improvement of the Absorbing Properties of Single Layer Microwave Absorbing Materials via Frequency Selective Surface
Authors: Tian Hao , Liu Hai Tao
Published: March 2013

The absorbing properties of single layer microwave absorbing materials containing frequency selective surface have been analyzed by a finite element method. Absorbing materials with optimum absorbing performances are fabricated according to the numerical simulation results. Experiments are carried out to validate the analytical method. The results show that the presence of the frequency selective surface can significantly improve the absorbing properties of the single layer microwave absorbing materials if proper parameters are chosen, promising great potentials in the microwave absorption applications.
The Study on Surface Morphology and Residual Stress of Al2O3 Film
Authors: Pu Ying Dong , Tang Wu , Yang Yu Tong
Published: March 2013

The aluminum oxide (Al2O3) films are grown on n-type Si-(100) substrate by electron beam evaporation at substrate temperature 500°C~800°C. The Al2O3film surface morphology is characterized by atom force microscopy (AFM) to evaluate the grain microstructure, and the residual stress was investigated by wafer stress analyzer. The results show that different substrate temperature is important condition to the properties of Al2O3film. Microstructure characterization indicates that the film surface at low substrate temperature is smoother, and the surface roughness of these Al2O3films is in the range 1-6 nm. The residual stress increases with increasing the substrate temperature, while the stress decreases after annealing in N2condition. It also can be concluded that the microstructure is correlated with residual stress.
Hydrothermal Preparation of Flower-Like CuS Superstructure and its Optical Property
Authors: Jia Bao Rui , Qin Ming Li , Chu Ai Min , Liu Ye , Kang Qi Ping , Qu Xuan Hui
Published: March 2013

The CuS flower-like superstructures were selectively and facilely synthesized by a hydrothermal method at 120 °C. The EDS, SEM, HRTEM and FFT results show that the CuS superstore has a well-defined uniform 3-dimensional flower-like morphology. These superstructures have sizes of about 500 nm and are built from several intersectional nanoplates, which have a mean length of about 500 nm and an average thickness of about 50 nm. Optical absorption spectrum of the CuS superstructure shows it has good absorption in the near-IR region and the band gap is 2.08 eV.
Investigation on the Properties of Sb-Doped CdTe Thin Films
Authors: Feng Song , Li Rong Ping , Tian Lei , Zou Kai , Liu Yong Sheng
Published: March 2013

Pure CdTe thin films and metal Sb-doped CdTe thin films are prepared on soda lime glass substrates by vacuum evaporation method. The prepared films have a cubic crystal structure with a preferential growth orientation along CdTe (111) crystal orientation. The experimental results show that the film surface doped Sb is more compact and uniform. And doping Sb in pure CdTe thin films significantly enhance the optical absorption and reduce the width of the band gap, which means that the optical absorption range of CdTe thin films can be widened. Finally, on the aspect of electrical properties, the resistivity of the thin films has significantly been lower.
Characterization of Defects in Gallium Nitride Thin Films by SEM
Authors: Jiang Ai Hua , Jiang Hao Yu , Zhao Hang , Xiao Jian Rong
Published: March 2013

Gallium nitride (GaN) thin films samples were grown by metal-organic chemical vapor deposition (MOCVD) with ammonia and trimethyl-gallium, and the samples were annealed rapidly at different temperature. The scanning electron microscope (SEM) analysis was employed to study the surface morphology and lattice defects of the GaN thin films. The surface morphology of the thin films prepared at different condition was uniform and smoothly. The relationship of the films defects and the annealed temperature were summarized.
Study on Anti-Sliding Performance of Asphalt Pavement with Mafilon Thaw Material
Authors: Song Yun Lian , Liu Peng , Ren Huang
Published: March 2013

For improving the anti-sliding performance of asphalt pavement in ice-snow areas, a new structure is constructed by using the saline content snowmelt agent- Mafilon, and its mix proportions and construction technology are researched. The experiment result shows that Mafilon material replaces the mineral powder in asphalt concrete with 5%, and this new pavement has good anti-sliding performance in frozen zone. This new pavement is used on the freeway with long and continuous steep vertical slope, and the result shows that the ice and snow landing on the pavement will melt instantly, and don’t ice, so the vehicles may not slipping. The traffic safety is greatly improved. Thereby, the design of mix proportions and construction technology given in this article can be taken as reference for the extending using of asphalt pavement with anti-sliding performance.
Short-Term Ageing Influence on the Creep and Recovery Characteristics of Asphalt Binders
Authors: Wang Chao , Zhang Jin Xi , Song Ping Ping
Published: March 2013

This paper focused on the short-term ageing influence on the creep and recovery characteristics of neat and SBS modified asphalt binders at two different stress levels. Using the MSCR test conducted on dynamic shear rheometer (DSR), it can be concluded that the RTFOT short-term ageing process was observed to decrease the nonrecoverable compliance (Jnr) and increase the average recovery percent (R) for almost all binders, which was more notable at a high stress level especially for SBS modified binders. Additionally, stress level applied in test played a key role in evaluating the viscoelastic properties of different asphalt binders, and SBS modified binder exhibited more stress sensitive than neat binders.
Damage of Cement Paste in Sulfate Environment with Different Temperature and Drying-Immersion Cycles
Authors: Wu Xue Feng , Jin Zu Quan , Zhao Tie Jun , Gao Song
Published: March 2013

Damage of cement paste under attack of sodium sulfate solution with different temperature and regime were carried out in this paper. Experimental study was executed on cement paste admixed by fly ash and GGBS. Sulfate concentration is 33.8g/l SO42- solution (5% by mass of Na2SO4). Two exposure regimes are employed in this study including immersion and drying-immersion cycles. In immersion regime, the temperature of sulfate solution is room temperature, 50°C and 80°C. Physical properties and sulfate ion distribution of paste were systematically tested during 150 days of sulfate exposure. And effects of raised temperature and drying-immersion cycles on deterioration of paste were also determined. The experimental results show that the strength, mass and expansion rate of paste improves initially and then progressively degrade until failure in sulfate environment. Beside chemical attack, which is major damage factor to paste in immersion regime, crystallized thenardite results in surface scaling of paste in drying-immersion cycles. Raised temperature and drying-immersion cycles accelerate the physical properties evolution process and increase the effective sulfate diffusion coefficient.
Experiment Research on Plastic Strength of Grouting Materials of Desulfurization Denitration Ash
Authors: Zhang Hong Hai , Gong Ai Min , Wang Chun Yan
Published: March 2013

Derived calculation formula of plastic strength, and used mortar consistency instrument to determine plastic strength. Through experiment, the fly ash and silicon powder that desulfurized or denitrated as grouting materials, its change rules of plastic strength were studid under different water cement ratio and different dosage conditions. Results shows that, between the two factors of water cement ratio and dosage, the water cement ratio affect significantly the plastic strength. The smaller the water cement ratio, the more obvious the increase of the plastic strength as time growth. Early plastic strength of silicon powder grouts is growing rapidly.
Study on Heat Conductivity Coefficient Value of Thick-Typed Fireproofing Coating for Tunnel at Elevated Temperature
Authors: Wan Fu Xiong , Zheng Wen Zhong
Published: March 2013

In view of the issue that Heat Conductivity Coefficient (HCC) value of Thick-typed Fireproofing Coating (TFC) for tunnel at elevated temperature is not unknown, which makes researchers unable to make right fireproofing design and analysis for structure, starting from composition of TFC for tunnel, regarding it as complex of insulation aggregate and adhesive material, and using series model and parallel model, formulas of HCC at elevated temperature are established. The temperature field in three specimens is calculated by above HCC value, and is compared with testing results. Analysis result shows that HCC value from series model is the most reasonable. This paper provides an effective Solution for HCC value of TFC for tunnel at elevated temperature.
Effect of Slate Powder on Alkali Activity of Slate Aggregate
Authors: Peng Xian Xiao , Li Gu Hua , Huang Wu , Li Fu Hai , He Xiao Chun
Published: March 2013

In order to study the effect of manufactured-sand’s feature on the alkali activity of slate aggregate, refer to the accelerated mortar bar test in the “Standard for Constructional Quality Acceptance of Railway Concrete Engineering” TB 10424-2010. The text has studied the expansion of the specimens that are made from slate aggregate with different powder contents or different particle size distribution. The results show that: When the content of powder in slate aggregate is less than 10%, the powder dose not have adverse effects on the expansion of specimens, and when the powder content is 15% to 20%, the expansion has downward trend. Slate powder is an active powder. It can not suppress the alkali-aggregate reaction of slate aggregate, but it can reduce the expansion of specimens. Particle size has influence on the expansion of specimens. The most unfavorable particle size of slate aggregate for the alkali activity is 0.16~0.315(mm).
Finite Element Analysis of Wear in Piercing
Authors: Yang Yu , Liu Cun Ping , Yuan Yong Fu , Guo Sheng
Published: March 2013

Present work describes a piercing process using the finite element method in order to investigate the wear of mold punch. In present investigation, the piercing clearance and punch fillet radius was studied by simulating the piercing operation of an AISI 1035 sheet. Simulation used the FEM program ANSYS/LS-DYNA. The results show that the best resistance of the mold punch is reached when the punch round radius reached 0.03mm and piercing clearance reached 0.15mm.