bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research of Bivariate Minimum-Energy Wavelet Frames and Pseudoframes
Authors: Wang Ping An
Published: December 2010

Frames have become the focus of active research, both in theory and in applications. In the article, the notion of bivariate minimum-energy wavelet frames is introduced. A precise existence criterion for minimum-energy frames in terms of an inequality condition on the Laurent polynomial symbols of the filter functions is provided. An explicit formula for designing minimum-energy frames is also establish- ed. The sufficient condition for the existence of a class of affine pseudoframes with filter banks is obtained by virtue of a generalized multiresolution analysis. The pyramid decomposition scheme is established based on such a generalized multiresol- -ution structure.
A High Performance/Price Ratio Cluster Computing Platform for Simulation Design
Authors: Zeng Xiao Hui , Guo Ming , Liu Jun Rui , Luo Wen Lang , Kang Ji Chang
Published: December 2010

Based on our Fibre-Channel Token-Routing Switch-Network, a high performance/price ratio cluster computing platform is put forward and developed for simulation design which needs large-scale parallel computation. According to the feature of our cluster computing platform, the cluster computing software platform is proposed and implemented. The cluster computing software platform has two parts: the cluster management scheduling sub-platform and the cluster tasks running sub-platform. The cluster management scheduling sub-platform is composed of the cluster management system and the task scheduling system, and the cluster tasks running sub-platform includes the FC-TR communication software and the FC-TR parallel programming environment. The FC-TR communication software provides high-bandwidth, low-latency communication services for the parallel programming environment on the upper layer, while the parallel programming environment makes a number of large-scale-computation simulation design applications run on our network seamlessly. The experiment results show that our cluster computing platform has achieved better performance than the Scali cluster computing platform.
Gate-Length Biasing Technique of Complementary Pass-Transistor Adiabatic Logic for Leakage Reduction
Authors: Hu Jian Ping , Zhang Yu
Published: December 2010

Scaling down sizes of MOS transistors has resulted in dramatic increase of leakage currents. To decrease leakage power dissipations is becoming more and more important in low-power nanometer circuits. This paper proposes a gate-length biasing technique for complementary pass-transistor adiabatic logic (CPAL) circuits to reduce sub-threshold leakage dissipations. The flip-flops based on CPAL circuits with gate-length biasing techniques are presented. A traffic light controller using two-phase CPAL with gate-length biasing technique is demonstrated at 45nm CMOS process. The BSIM4 model is adopted to reflect the characteristics of the leakage currents. All circuits are simulated using HSPICE. Simulation results show that the CPAL traffic light controller with the gate-length biasing technique attains 20% to 5% energy savings compared with the one using the original gate length 25MHz to 200MHz.
Study on a Real-Time Corner Detection Algorithm
Authors: Guo Yong Fang , Yu Ming , Sun Yi Cai
Published: December 2010

Conventional Harris corner detector is a desirable detector but it requires significantly more computation time. For MIC detector proposed by Trajkovic, the minimal computational demands of its operator make it well-suited for real-time applications, however the Trajkovic’s operator responses too readily to certain diagonal edges. For this reason, the paper proposed a new corner detection algorithm. The new corner detection algorithm adopted multigrid algorithm and preprocessed the lower resolution revision of the original image to obtain the potential corners, subsequently used autocorrelation matrix to get the corner response function for the corresponding points of the potential corner. The test results indicate the new corner detection algorithm can decrease edge responses and the number of textural corners effectively. Furthermore, it can satisfy the demands of real-time applications.
Continuous Wavelet Transforms of Multivariable Abstract Function Spaces
Authors: Qu Han Zhang , Yang Jing
Published: December 2010

An abstract function space is proposed and discussed. One-dimensional continuous wavelet transform is applied to the continuous wavelet transforms of the multivariable abstract function spaces .The reconstruction formulas of it produced by the integral kernel of the transform multivariable abstract functions and those of it produced by the integral kernel of the multivariable abstract functions which are difference from the transform multivariable abstract functions are obtained in the weak topology as well as in the sense of norm convergence.
Research on Personalized Learning Service Based on Collaborative Filtering Method
Authors: Xu Min , Fang Mei Qi , Yang Pan Pan , Chen Yu
Published: December 2010

In this paper, we discussed various personalized learning recommendation service and their advantages and disadvantages. On the basis of these methods, we proposed the similarity degree computing algorithm and user community discover algorithm. After verifying, analyzing and evaluating these algorithms and the recommendation model, we applied it as a recommendation service in SGCL (Social Group Collaborative Learning) System. Using the model in SGCL system, the system can recommend user personalized information and practical data proves that it can improve the learning quality effectively.
Refitting Sites Selection of Ocean Trawler Based on Fuzzy Matter-Element Model and Information Entropy Theory
Authors: Shao Fei , Li Feng , Jiang Ke Bin , Li Pei
Published: December 2010

Refitting sites selection of ocean trawler in wartime, is affected by a variety of technical factors and other factors such as organization, planning, management, and so on. The index system is given by detailed analysis of the influence factors. A fuzzy matter-element model is built up in view of the fuzziness and incompatibility of the indexes, combining quantitative analysis with qualitative analysis, with quantifying the qualitative indexes by linguistic variables and fuzzy numbers. The information entropy theory is used to calculate the value of index weights, to reduce the subjective randomness. The multi-objective selection problem is transformed into the single-object decision by Euclid approach degree. The example shows that the method is very practical and the result is objective.
Analyses and System Implement to Fingerprint Image Segmentation Algorithm Based on Field
Authors: Wang Yan Bai , Tan Lu , Li Nian Feng , Liu Wei
Published: December 2010

Introduced the fingerprint segmentation algorithm based on strength field and gradient field and designed the experimental system for the algorithm. The method is used to carry on the massive tests with fingerprint images by APC fingerprint gathering. The experimental results show that this method achieved a good fingerprint image foreground and background separation zone.
Room Temperature Synthesis and Characterization of Au Nanoparticles
Authors: Haq Sharmin , Ashrafee Tasnuva , Begum Mahmuda , Sharmin Tasmia , Bhowmick Nirban , Mahmood Zahid Hasan
Published: December 2010

The new emergent properties of nanoparticles include quantam size effect, nonlinear optical properties and thus the nanomaterials have extensive applications in microelectronic, bacteriostatic and catalytic or magnetic recording materials. Nanoparticles find potential applications in DNA detection and photo detection. Gold nano particles (AuNPs) are useful in nanoscale devices and systems due to its resistance to oxidation. In this paper a cost effective, versatile and simple one step room temperature synthesis of highly stable and freestanding Au quantum dots capped by TTAB (Tetradecyltrimethyl Amonium Bromide) in the range of 10-90 nm is reported. Ultraviolet- visible spectroscopy (UV-VIS), Fourier transformation infrared spectroscopy (FT-IR) was carried out to characterize these samples. Scanning Electron Microscopy (SEM) confirms the AuNPs sizes of about 80 and 88 nm.
Displacement Amplification of Electrostatically-Driven Microgripper in a Hybrid Design with Electrothermal Actuation
Authors: Hamedi Mohsen , Salimi Parisa , Vismeh Milad
Published: December 2010

By the growing development of micro electromechanical systems, the application of microgrippers for handling and assembling of microparts attracts more attention. In this paper, an electrostatic microgripper using comb drive mechanism is designed and a formulation is presented to predict the critical voltage for pull-in instability threshold. Then the advantages of a modified model of electrothermal U-shape actuator with large forces and bilateral displacement are utilized to amplify the output displacement range of microgripper prongs. To show this amplification, finite element simulations are performed on the primary and modified microgripper proposed models.
Physicochemical Properties of Porous Starches from Different Botanical Origin
Authors: Xiao Hua Xi , Lin Qin Lu , Wu Yue , Tian Wei , Wu Wei
Published: December 2010

Rice, maize and potato starches were hydrolyzed by amylase to obtain porous starches as final product. The adsorptive capacity, desorbed rates, degree of crystallinity and retrogradation properties of native and porous starches were investigated. The results showed that porous starches had the stronger adsorptive capacity and slower desorbed rate compared with native starches. In the three starch materials, the adsorptive capacity of rice starch for liquids was the strongest; the adsorptive capacity of potato starch for liquids was the weakest. the more flavors adsorbed, the more flavors desorbed. X-ray diffraction showed that Enzyme hydrolysis did not result in any significant changes in the degree of crystallinity of starch. The porous starches exhibited lower tendency of retrogradation as assessed by differential scanning calorimetry (DSC).
Underwater Docking of AUV with the Dock and Virtual Simulation
Authors: Zhang Xun , Bian Xin Qian , Yan Zhe Ping
Published: December 2010

To expand the working field of AUV, a kind of underwater docking technology of AUV with the dock is introduced which has an acoustic short baseline positioning system and visual guiding system. The short baseline system can guide the AUV to implement long range navigation. And the visual guiding positioning system can guide the AUV’s underwater close docking. To get intuitive demonstration on surface workstation, the virtual simulation module using creator and Vega Prime software was developed. Through pool experiments, it shows that the docking mode is feasible and the simulation is intuitive, effective.
A Fast Algorithm for the Inverse of a Tridiagonal Period Matrices in Signal Processing
Authors: Fu Xi Lian
Published: December 2010

The theory and method of matrix computation, as an important tool, have much important applications such as in computational mathematics, physics, image processing and recognition, missile system design, rotor bearing system, nonlinear kinetics, economics and biology etc. In this paper, Motivated by the references, especially [2], we give the estimates for the lower bounds on the inverse elements of strictly diagonally dominant tridiagonal period matrices.
Research of Tree Modeling and Rendering in Virtual Reality
Authors: Li Yao , Yu Chen
Published: December 2010

In the field of virtual reality, tree modeling and rendering technique is a hotspot. This paper summarizes the current basic methods of tree modeling and rendering. At first, we present basic principles of making tree models, then show the two methods of tree modeling and rendering used in game scenes in virtual reality. One is the tree modeling technique based on 3Dmax, the other is the tree rendering technique based on OpenGL. At last we give the application examples of these two methods and compare the two methods in navigation system project.
Research on HLA Optimistic Time Advance Mechanism Based on FQR
Authors: Li Xiang Ning , Ma Jing
Published: December 2010

With the widely application of High Level Architecture (HLA) standard that supports interoperability and reusability, correct understanding of time management and advance mechanism in HLA has been a concerning difficult problem in the field of distributed simulation. Aiming at the problem, the paper analyzed and compared difference between conservative time advance mechanism and optimistic time advance mechanism. The rollback manager was introduced to implement the optimistic time advance mechanism. The middleware was also applied to deal with the rollback process in simulation model. In order to make fully use of advantages of optimistic synchronization mechanism, Flash Queue Request (FQR) service that provided by HLA was used to arrive at an improved time advance algorithm.
Design of Video Sensor Based on Wireless Sensor Networks
Authors: Bai Zhan Yuan , Xu Ai Dong
Published: December 2010

Introduces a wireless video sensor, which is based on wireless sensor networks technique. It can be widely used including battlefield intelligence, security monitoring, and environmental tracking. The Zigbee communication protocols is based on the IEEE 802.15.4-2003 standard. With JPEG compression, the video can be transmitted through the low rate wireless network. Wireless video sensor nodes form mesh networks, and transmit video information to coordinator. The coordinator connects to monitor station, and the monitor software display the video from the nodes in the wireless networks.
Computer Simulation of Temperature Induced Spectra Broadening and Shift in Y3Al5O12:Ce Phosphor
Authors: Ji Ting , Xi Qun , Zhang Yan Fang
Published: December 2010

Y3Al5O12:Ce phosphor was prepared by solid-state method, and the XRD pattern is consistent with the standard phase of YAG. Temperature dependence photoluminescence (PL) measurements of Y3Al5O12:Ce excited at 342 nm only show a broad emission band with peak at 532 nm is assigned to the combination of the lowest energy of 5d bands and the 2F5/2 and 2F7/2 states respectively. And full widths at half maximum (FWHM) and emission energy of Y3Al5O12:Ce emission increase with increasing temperature. The red shift and FWHM in the PL spectra with the temperature increasing are simulated by equations for the temperature dependence using LM, BFGS, DE, GA and SA algorithms, and compared the RMSE, SSE, R, R^2, DC and Chi-Square of each result respectively. Moreover, comparison of the result from the computer simulation in LM, BFGS, DE, GA and SA methods through compared values of the RMSE, SSE, R, R^2, DC and Chi-Square parameters are discussed.
Gas Sensitivity of MnO2 Doped Nano ZnO Coplanar Plate-Type Gas Sensor Arrays
Authors: Huang Kai Jin
Published: December 2010

Based on the integrated technologies of screen printing and hydrothermal method, this paper introduced a new integrative method with materials microstructure controlled growth and gas sensor fabrication. For example,based on space positioning using screen printing and ZnO nanwall with large specific surface area induced by hydrothermal method on the surface of ZnO film, the MnO2 doped nano ZnO coplanar plate-type gas sensor arrays with a good gas sensitivity to formaldehyde were fabricated successfully. The results show that the sensitivity to formaldehyde of MnO2 doped nano ZnO gas sensor arrays fabricated by hydrothermal method in 0.01mol/L Zn(NO3)2 solution, 95°C for 5h on the surface of MnO2 doped nano ZnO film and sintering at 500°C for 2h is higher than that of in distilled water. The existence of ZnO nanwall with large specific surface area induced by hydrothermal method on the surface of MnO2 doped nano ZnO film is the important reason of improvement for the sensitivity to formaldehyde.
A Content-Based Image Retrieval System with Image Semantic
Authors: Ma Ying , Zhang Lao Mo , Ma Jin Xing
Published: December 2010

With the development of information technology and multimedia technology, more and more images appear and have become a part of our daily life. Efficient image searching, storing, retrieval and browsing tools are in high need in various domains, including face and fingerprint recognition, publishing, medicine, architecture, remote sensing, fashion etc. Thus, many image retrieval systems have been developed to meet the need. The aim of content-based retrieval systems is to provide maximum support in bridging the semantic gap between the simplicity of available visual features and the richness of the user semantics. In this paper, we discuss the main technologies for reducing the semantic gap, namely, object-ontology, machine learning, relevance feedback.
DSAR: A New Segmentation Scheme for Input Buffered Switches
Authors: Gao Zhi Jiang , Zeng Hua Xin , Xia Yu
Published: December 2010

Input Buffered switches can not directly deal with variable size packets. The variable length packets need to be segmented into fixed length cells before scheduling. Then segmentation and reassembly (SAR) must be used. The traditional SAR scheme can lead to significant loss of fabric bandwidth due to the padding bytes, which requires speed up in switch fabric to compensate for this bandwidth loss. The improved scheme called cell merging can reduce the bandwidth loss greatly but it has low scalability and it is difficult to select suitable merging size. In this paper, we propose a new method of SAR for Input buffered switches using the queue information of switches and can adjust the segment size dynamically. New scheme is suitable for different traffic model and can provide an excellent delay performance. We evaluate DSAR scheme using simulation, the results show that it outperforms existing segmentation schemes in Input Buffered switches.
A Finite Element Analysis Simulation Model of one-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Analysis
Authors: Zhou Ying , Shuai Ci Jun , Feng Pei
Published: December 2010

To explore fluid-thermal analysis of the flow fields of front-box and One-spacer nozzle of aluminum roll-casting, a three-dimensional finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of outlet of nozzle, by using coupled fluid-thermal FEM simulation of FLOTRAN module in ANSYS 6.0. Stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of one-spacer nozzle was able to match cooling capacity of cast rollers, and one-spacer nozzle could be optimized to work in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.
Simulation of Nine-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Finite Element Analysis
Authors: Zhou Ying , Tan Ya Xi
Published: December 2010

A three-dimensional coupled fluid-thermal finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of nine-spacer nozzle by using FEM simulation of FLOTRAN module in ANSYS 6.0. To explore fluid-thermal analysis of the flow fields of nine-spacer nozzle of aluminum roll-casting, stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of nine-spacer nozzle was able to match cooling capacity of cast rollers, but nine-spacer nozzle’s geometric flaw didn’t suit for working in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.
The Fine Characters of a Sort of Biorthogonal Four-Dimensional Nonseparable Wavelet Packs
Authors: Guo Hong Lin , Yu Yu Min
Published: December 2010

In this article, the notion of orthogonal nonseparable four-dimensional wavelet packs, which is the generalization of orthogonal univariate wavelet packs, is introduced. A new approach for constructing them is presented by iteration method and wavelets as well wavelet frames. The biorthogonality properties of four-dimensi- -onal wavelet packets are discussed. Three biorthogonality formulas concerning these wavelet packs are estabished. A necessary and sufficient condition for the existence of the pyramid decomposition scheme of space is presented.
Research on Network Intrusion Detection System
Authors: Xu Jiang , Cao Zhong Wei
Published: December 2010

This paper firstly introduces the status of network safety, network safety aim, traditional network safety technology and necessity of network intrusion detection system (NIDS). Secondly, this paper discusses the concepts and definitions of NIDS. Thirdly, this paper analyzes structure and key technologies of NIDS. Finally, introduces an example software of NIDS –snort.
Research on Multi-Agent Automated Negotiation & Dynamic Cooperation
Authors: Zhang Lian Mei , Yao Li Na , Luo Xin Mi
Published: December 2010

This paper presents a distributed multi-agent dynamic cooperation method. In the system, the communication between agents has some special requirements. One of them is asynchronous communication. Communication sequence process (CSP) is used to descript a model of agents’ communication with shared buffer channel. The essence of this model is very suitable for the multi-agents communication, so it is the base for our next step job. Based on the communication model, the figure of agents’ organization is given by exploring the distributed tasks dealing method among joint intention agents and with description of relation between tasks. Agents communicate with each other in this kind of organization. The semantics of agent communication is another emphasis in this paper. With the detailed description of agents’ communication process, given a general agent automated negotiation protocol based on speech act theory in MAS, then we use CSP to verify that this protocol has properties of safety and aliveness. So it is proved it is logic right. At last a frame of this protocol’s realization was given.
Uniaxial Stress-Strain Model for Concrete Confined by Rectangular Steel Tubes
Authors: Long Yue Ling , Cai Jian
Published: December 2010

This paper presents a new model for uniaxial stress-strain relationship of concrete confined by rectangular steel tubes. The difference between concrete confinement effect provided by broad faces and that provided by narrow faces of steel tube is considered in the proposed model. The failure criteria for concrete subjected to triaxial compression is applied to estimate the ultimate strength of concrete core. The parameters of the model are determined based on the test results and the calculation of complete load-stress relationship curves is conducted for axially loaded rectangular CFT specimens using the model proposed in the paper. The concrete core strength and stress-strain behavior of rectangular CFT columns is found to exhibit good agreement with test results.
Finite Element Analysis of Axially Loaded Confined Concrete Columns
Authors: Meng He , Yang Kun , Shi Qing Xuan , Men Jin Jie
Published: December 2010

The finite element analysis of high-strength concrete columns confined by high-strength spiral lateral ties under concentric compression is introduced in this paper. The variables of tie strength, tie spacing and tie configuration influencing the characteristics of confined concrete are discussed; and the stress distributions of lateral ties and concrete at cross-section are analyzed. Compared with the test results, this finite element analysis can predict well the behavior of axially loaded concrete confined by lateral ties. It’s indicated that after peak load, normal stirrups loss the effective constraint on concrete due to yielding early, while the high-strength stirrups can continue to provide larger constraint which can improve significantly the ductility of confined concrete.
Seismic Behavior Analysis on Reinforced Concrete Core Walls Based on Fiber Model
Authors: Hou Wei , Shi Qing Xuan , Ma Zhi Lin
Published: December 2010

Reinforced concrete core walls with good anti-side rigidity and spatial rigidity is used widely in high-rise buildings. Elasto-plastic static analysis of core walls are be realized by the program CANNY based on the theory of fiber model. Compared with the tests, Results from the simulation anlysis match well with those from the tests. The influence of axial compression ratio and height-width ratio on the bearing capacity and deformation of core walls are analyzed systemically. It is shown that the fiber model is available and successful for the numerical simulation of core walls. The axial compression ratio has distinct affect on the elastic and inelastic behavior of RC core walls. The ratio of height to width not only has effect on the bearing capacity and deformation performance, but also changes the failure mode of RC core walls. The numerical results confirmed the accuracy of this analysis procedure in representing the nonlinear behavior of core walls.
Analysis of the RC Slab under Gas Explosion Load
Authors: Han Yong Li , Chen Long Zhu
Published: December 2010

In order to put forward protective measures and reduce the hazards caused by gas explosion events, it is significantly important to analyze the antiblast properties of the slab. According to the precast slab and poured slab that badly damaged in this two accidents, the antiblast ability of the slabs and explosion overpressure were analyzed. The overpressure differs little but the destruction differs much of the two accidents, so effects of some parameters on the the antiblast ability of the slab were calculated based on multigroup models. The results show that, boundary condition is the primary influence factor, the next is thickness, while the influence of reinforcement ratio is comparatively lower. Based on the calculation results, some protective measures were put forward. The analysis methods and conclusions can offer certain reference to the housing protection design and study.
Study on Rutting of Asphalt Pavement
Authors: Yi Wen , Wang Yong He , Zhou Rui
Published: December 2010

Rutting is one of the major damage modes in asphalt pavement. Many management departments need to conduct a reasonable assessment of rutting and damage cause analysis to roads. We often use on-site observed means for assessment of road surface rutting. We use methods of on-site core and cutting specimens for laboratory analysis. This paper tell this method of determining the reasons for rutting damage by analyzing the porosity, sub-layer uplift factor, size distribution, whetstone ratio and rutting test results.
Experiment Research on Performance of Low-Temperature Crack Resistance of Reinforced Asphalt Mixtures
Authors: Zhong Yu Xia , Wang Xian Li , Liao Ming Jun
Published: December 2010

According to the phenomenon of pavement cracking in low temperature in Northeast China, AC-13I and AK-13I of the two gradations, SBS, Methyl Cellulose fiber and steel fiber are adopted to research the mechanics parameters of reinforced asphalt mixture by Indirect tension test at minus 10 degrees centigrade entering on pavement material. Improvement of the low-temperature indirect tensile strength, stiffness and deformation capacity of asphalt mixture is analyzed and mechanisms are revealed. The results indicate that low-temperature crack resistance of steel fiber-reinforced AC-13I asphalt mixture is improved significantly, it is better for the cold area in Northeast.
Performance Index Limits of Medium-Height RC Shear Wall Components
Authors: Lao Xiao Chun , Han Xiao Lei
Published: December 2010

In order to determine the deformation performance index limits for medium-height RC shear wall components based on Chinese codes with the shear span ratio between 1.0 and 2.0, the reliability of the nonlinear finite element method was first verified by four typical medium-height shear wall components experiments in some literatures. Then, the nonlinear finite element method was applied to analyze a set of medium-height RC shear wall components designed according to current Chinese codes. Parametric studies were made of the influence of shear span ratio λ, axial compression ratio μ and main flexural reinforcement ratio of confined boundary members ρflex. Finally, the deformation performance index and its limits of the medium-height RC shear wall components under severe earthquakes are presented by the finite element model results.
The Effect of Fly Ash on Calcium Leaching Properties of Cement Pastes in Ammonium Chloride Solution
Authors: Yang Hu , Jiang Lin Hua , Zhang Yan
Published: December 2010

The damage process of pure cement pastes with water to cementing material ratios of 0.30, 0.40, 0.50 and 0.60 and fly ash modified pastes with mass fraction of 10%, 30%, 40% and 55% were studied by using ammonium chloride solution with concentrations of 6 mol/l. The total leaching depth, leaching depth, porosity and compressive strength of these pastes leached for 14, 28, 56, 91 and 140 days were tested. The influences of W/C ratio and fly ash content on these properties were analyzed, the relationship between the two factors and the corrosion resistance of pastes was summarized. The results show that the total leaching depth of fly ash modified paste is larger than that of pure cement paste. However, the fly ash modified paste suffers various degree of lowered increment in porosity and strength loss (in percentage) in connection with the added content.
Study on Effects of Soil-Structure Interaction to Earthquake Resistance of Bridge
Authors: Fan Yan Yan , Li Zi Qi
Published: December 2010

As a steel pipe concrete arch bridge for example, the difference of earthquake response is analyzed and studied by considering and not considering soil-structure interaction according to software ANYSY. It provides a reference for the design of the large bridge.
The Properties of Oxidated Carbon Fibers Reinforced Cement
Authors: Xu Xian Feng , Hu Yan Yan
Published: December 2010

Carbon fiber (CF)is the most important reinforcement in advanced composites.Carbon fiber-reinforce cement（CFRC）possess all right mechanical properties.Carbon fiber-reinforce cement（CFRC）was produced after Carbon fibers (T700) were slightly oxidized by the method of oxidation treatment at 773K in air for a short time. The result indicates that the density of CFRC reduces, porosity enhances, the bending strength and the compressive strength enhance when carbon fibers increases,by detecting the pre-and post-treatment physical and mechanical properties of CFRC, observing the microstructure of the fracture of the Side Bend Test samples. SEM morphology shows that the fracture of carbon fibers without oxidation is pull-out failure mainly while these with oxidation is pull- cut failure mainly. In a word,Carbon fibers with slight oxidation can improve the combine state of the interface between the fibers and the matrix, and accordingly improve the mechanical properties of the CFRC.
Study of Shear Capacity in Brazilian Prestressed Hollow Core Slabs
Authors: Catoia Bruna , Ferreira Marcelo De Araujo , Pinheiro Libanio Miranda
Published: December 2010

Hollow core slabs have a bold design and can be used in a wide variety of structural systems, performing like floor slabs or wall panels. These slabs are economical due to geometrical and mechanical efficiency of its cross sections, allowing the rationalization of materials consumption (concrete and prestressed strands). The increase of the use of hollow core slabs within the Brazilian construction market has caused a significant boost of production, demanding the assessment of the actual strength capacity of these elements. This paper presents results relative to several hollow core slabs produced in a Brazilian factory, subjected to shear tests according to FIB recommendations. The experimental results were compared with those obtained with the equations from the Guide to Good Practice: Special Design Considerations for Precast Prestressed Hollow Core Floors, published by FIB in 2000.
Nonlinear Seismic Response of Special-Shaped Column Frame Structures
Authors: Han Xiao Bin , Bao Chun Sheng , Gao Ying , Bian Jian Min
Published: December 2010

The spatial analysis model of special-shaped column frame structure is established in ANSYS. The nonlinear dynamic analysis is carried out for the structure by inputting ground motions in one direction. The seismic performance of the structure under rare seismic actions was examined and whether the structure achieved the predetermined seismic aims is evaluated. The results indicates that the structure which under the 8-degree zone designed according to the codes can achieve the predetermined seismic aims under the rarely occurred earthquake actions.
Analysis on Effectiveness of Landslide Control Based on Internal Force Monitoring of Anti-Slide Piles
Authors: Deng Qing Lu , Zhu Da Peng
Published: December 2010

Landslide, rock falling, river erosion are the serious geological disasters that make effect on Zhongxian-Wuhan gas pipeline safety, and the landslide is the most outstanding disasters among them, and anti-slide pile was often used to reinforce landslide mass. However, computation and design of anti-slide pile approximation in actual`dge issues that worth further studying. Irrational design of anti-slide pile can result in landslide risk still exist, landslide is still possible to failed, and conservative design although eliminate landslide risk, and at same time it causes waste of money. So it has important theoretical and engineering significance to verify the accuracy of the design and assess control effectiveness of landslide based on internal force monitoring of anti-slide pile. Based on axial force monitoring main reinforcement inner anti-slide pile, this paper gets the factual moment variation of anti-slide pile of Shunxi No.1 at different times, and compared factual moment with theory moment calculated by the commonest M method. The result showed that the theory measurement calculated by M method is much more then factual moment, so it is safe to compute internal force of piles by M method. Currently, it indicates that the landslide after treatment is under a stable state because of less stress acting on the pile, and the main threat to the gas pipeline will vanished, and the expected control aim is achieved. It has great reference for internal force design of anti-slide pile retaining structure and control effectiveness evaluation.
Experiment Study on Concrete Block Model Shaft Lining Used in Freezing Shaft
Authors: Jiang Hao Liang , Liu Ri Hui
Published: December 2010

The deformation characteristic load-deformation curve, failure Patten and the load bearing capacity of concrete block shaft lining under uniform and non-uniform load condition are presented. They were got from the mechanical property test of layered concrete block masses. And the large Structure test of concrete block lining series of test data are provided for the design and calculation of concrete block lining, and the deformation control under sinking of freezing shaft in which this kind of lining is utilized.
A Stress Analytical Solution of Steel Reinforced Concrete Transfer Beam
Authors: Liang Bin , Yang Meng
Published: December 2010

The structural behavior of a steel reinforced concrete (SRC) transfer beam in high-rise building is studied in the paper. Mechanical properties and deformation characteristics between transfer beam and shear wall are analyzed by an analytic approach and the nonlinear finite element method. The stress analytical solutions for the SRC transfer beam are obtained and agree with finite element calculation data in an actual project. The results show that the beam can be as an eccentric tension member, meanwhile the performance of shear wall must be considered. And it also shows that the shear stress and vertical compressed stress must be considered in end both transfer beam and shear wall and there is interaction between the beam and the shear walls above. The results can be used to describe the behavior of the SRC transfer beam under complicated loads.
Calculation and Analysis on Out-Plane Force of Hollow-Shearwall in Large Space Residence
Authors: Cao Lang , Weng Wei
Published: December 2010

For new large space plate-wall structure, the out-of-plane problems of shearwall caused by vertical loads cannot be ignored. The out-of-plane stiffness can be increased by introducing Hollow-shearwall. However, currently rare attention has been focused upon research on the out-of-plane problems of hollow-shearwall. Based on the theory of elastic thin plate，the hollow-shearwall is regarded as an orthotropic plate in this paper. According to the actual situation of the loading on the shearwall, it is the first time that the analytic solution of the hollow-shearwall with different boundary constraints under the combined action of the end moment and vertical pressure has been derived in this paper. The numerical results by the program developed with Mathematical based on the analytic solution are compared with those obtained with ANSYS and it shows that this method is correct and reliable. Under various operating conditions, it is easy to apply this program for the out-of-plane force analysis, which can provide reference for the further research on the out-of-plane capacity and a reliable basis for engineering design.
Performance of Rubberized High Strength Concrete after Fire
Authors: Liu Feng , Chen Gui Xuan , Li Li Juan
Published: December 2010

The effects of recycled rubber powder on working abilities, density and compressive strength of high strength concrete (HSC) at room temperature were studied in this paper. The characteristics of rubberized high strength concrete (RHSC) after fire was investigated by surface observation, weight loss and retained strength testing. The sieve number of rubber powder used in test is No.40 (420μm), No.60 (250µm) and No.80 (178µm), and the content of rubber powder filled in RHSC is 1%, 2%, 3% and 4% with respect to cementation material respectively. Test results show that the increase in rubber powder content reduces the concrete strength, while the decrease in compressive strength of RHSC is less than 10% when the content of rubber powder is within 2%. RHSC with small content of rubber (1%) can restrain the spalling failure of concrete under high temperature.
Nonlinear Static Analysis of RC Shear Wall Structure Based on Opensees
Authors: Pan Zhi Hong , Li Ai Qun , Sun Yi Gang
Published: December 2010

To study the seismic performance of RC shear wall, and to develop its fine nonlinear analysis method, systemic studies on nonlinear static analysis and it’s realization method are carried out. Beginning with rotating-angle softened-truss model for coupled shear and flexural responses, analytical model of solid wall is presented based on the comparative study on four types of constitutive law of concrete for confined concrete of boundary zone. Good agreements between analytical and experimental results of load-displacement relation are found, which indicates that the proposed analytical method can reflect the global mechanical behavior of shear wall well. Studies on coupling beam and global perforated wall modeling are implemented, then modeling approach and nonlinear static analysis method for perforated wall are proposed. Comparing analytical load-displacement curve to experimental, initial stiffness and first turning point agree well and analytical ultimate capacity is close to experimental, which is shown that the load-displacement curve can actually exhibit the general load-displacement trend of perforated wall.
Discussion on Several Problems of Designing Steel Tubular Joints
Authors: Wang Fan , Luo Min , Zhang Zhi Gang
Published: December 2010

This paper investigated some problems in steel tubuar joints design.The joint stiffness has played an important role in evaluating the whole stability of the structure. Currently there is no clear standard for judging joint stiffness, this paper presents a way to identify the steel joints stiffness. Accordingly, the analysis results of joint stiffness can be directly applied to practical engineering. This paper also proposed new steel welded joints which adapt to space slant and twisted surface for solving problem about square steel pipe joints design. This joints not only ensure regional stiffness and have an attractive appearance, simple structure, but also apply to engineering very well. The result of the research has a certain value to practical engineering design.
Bending of Thick Rectangular Plates with Different Boundaries under Concentrated Load
Authors: Chen Ying Jie , Li Gang , Zhang Zhen Xian , Fu Bao Lian
Published: December 2010

Reciprocal theorem method (RTM) is generalized to solve the problem of bending of thick rectangular plate under concentrated load with four edges fixed and with two opposite edges fixed, the third edge simply supported, and the fourth edge free based on Reissner’s theory. The analytical solutions of the thick plate are given, and the relevant date and diagram are given to guidance engineering application.
Investigation on Flexural Behavior of Reinforced Concrete Beams Flexurally Strengthened by Different Methods
Authors: Li Gui Bing , Zhang Ai Hui , Jin Wei Liang
Published: December 2010

Externally bonding fiber reinforcement polymer (FRP)laminate to the soffit of reinforced concrete (RC) beam is an effective way to increase its flexural strength. However, there is little investigation on flexural behavior of RC beam by side-bonding FRP laminates.To investigate the difference of flexural behavior between soffit-bonding and side-binding FRP laminates RC beams,a total of 9RC beams were tested, including 8 strengthened beams and 1 control beam. The test results showedthat:1) As fiber reinforced concrete, side-bonding FRP laminates can also effectively increase the first crack strength of RC beams.The first crack load improved significantly; 2) side-bonding FRP laminates is not a good method to improve the flexural behavior of RC beam at the yield stage and the post yield stage. 3) Side-bonding of CFRP laminates is a good way for existing RC beams to control its crack width and deflection.
Research on Mechanical Behaviours of Three-Tower Suspension Bridges from the Perspective of Influence Line
Authors: Liang Peng , Wu Xiang Nan , Li Wan Heng , Xu Yue
Published: December 2010

Mechanical behaviours of three-tower suspension bridges from perspective of influence line help insight into mechanical behaviour nature, and grasp the differences between two-tower and three-tower suspension bridges in Static and dynamic behaviours. Based on the Taizhou Yangtze River Bridge, three dimensional space finite element models of two-tower, three-tower with floating system and three-tower with elastic cables between mid-tower and the girder were constructed. Through analysis of influence lines characteristics of different key effects and effect envelop under vehicular load, main conclusions are got as follows: Some factors such as deflection-to-span ratio of girder, anti-slipping safety factor between the main cable and saddle of the mid-tower and force in the mid-tower, horizontal displacement at the end of girder, which are not important in two-tower design, become controlling ones in three-tower suspension bridges and effects under vehicular load is the most important. When live load acts on all or part of one main span, the four control factors reach the worst case, but in very low probability. Code restriction on deflection-to-span ratio of girder can be flexible to relax restriction to 1/220, and riding comfort is still guaranteed. Stresses of mid-tower under vehicular load plus dead load are in a state of compressive stress in the majority of operating conditions and fatigue problem is not obvious.
Study on the Seismic Behavior of Hollow R.C Shear Wall Model Building with and without Seams
Authors: Wang Gang , Hu Xiao , Wang Qiong Mei , Gao Yong Tao
Published: December 2010

Based on the pseudo-dynamic and pseudo-static under low-cycle test of 10-storey model building without seams and 6-storey model building with seams, the change of dynamic characteristics, the failure mechanism, the deformation feature and ductility of two type structures are discussed. The result of experimental study proves that the capacity of hollow shear wall is well; In elastic stage, the hollow shear wall and common shear wall are similar: high stiffness and little deformation; In elastic-plastic stage, the deformation is increasing, and the slit hollow shear wall are divided into several little walls, the property of energy dissipation of hollow shear wall structure is good. The seismic behavior of the slit and integral hollow shear walls are used in the multi-story and low high-rise building.
Parameter Sensitivity Analysis of Vertical Deflection for Long-Span Continuous Rigid-Frame Bridge
Authors: Zheng Heng Bin , Yu Xiao Lin , Hu Jun Liang , Yan Quan Sheng
Published: December 2010

The excessive long-term deflections of a long span continuous girder bridge may induce vehicles to move unsafely and hazard to the bridge operation, thus to limit the development of this bridge type. In this paper the main parameters influencing the long-term deflections of a continuous rigid-frame bridge, such as pre-stressed losses, mass distribution of the box girder and Young’s modules of concrete etc., were investigated. With the establishment of the finite element model of a real bridge and the premise of describing mechanism of each parameter, detailed parameter sensitivity analysis of long-term deflections were carried out with numerical simulation method. The results of this study may help to understand the main mechanism about the long-term deflection of continuous rigid-frame bridge and provide some reference for the wide use of this type of bridges.
Effect of Detailed Formations on the In-Plane Shear Capacity of Hairpin Connectors in Precast RC Floor Slabs
Authors: Pang Rui , Liang Shu Ting , Zhu Xiao Jun , Meng Yao
Published: December 2010

Detailed formation of precast floor slab connectors has significant effect on their shear capacity, but there is no such specific provision on it at present. The effects of detailed formations on the shear strength, stiffness and deformation capacity of hairpin connectors(HPC) were studied, through numerical simulation analysis under in-plane shear force. The imbedded depth (d), slug length (h), steel plate thickness (t) and its stickout(s) were taken as parameters. The analysis results show that: ⅰ) the increase of imbedded depth can improve the bearing capacity and stiffness of HPC, but decrease the deformation capacity; ⅱ) with the increase of slug length, the HPC strength, stiffness and deformation capacity raised a lot; ⅲ) the steel plates’ thickness has small effect on the stiffness, but has strong impact on the strength and deformation capacity of HPC. ⅳ) the stickout can affect the initial stiffness and yield strength of HPC slightly, but has a considerable impact on its ultimate strength and deformation capacity. On the basis of analysis, recommendations on formation details of HPC are proposed for design and construction.
Long Term Deformation Control of Long-Span Pre-Stressed Concrete Continuous Rigid Frame Bridge with Ballastless Track
Authors: Cao Jian An , Ye Mei Xin , Hou Wen Qi
Published: December 2010

Aiming to Ronggui Bridge (RGB) on Guangzhou-Zhuhai Intercity Rapid Rail Transit (GZIRRT), long term deformation control of long-span pre-stressed concrete continuous rigid frame bridge with ballastless track was studied. Comparing with the non-controlled deformation, extend track laying six months later after bridge construction, reserve 48 post-tensioned cables in middle spans and tension 12 external tendons after tracking laying were all effective in decreasing the long term deformation of RGB with individual application. Taking bridge construction and railway service in consideration, applying the foregoing three measures in combination, deformation of RGB 20 years later after track laying was effectively controlled within 12.8mm in the side spans and 21.9mm in the middle spans, which is less than the deformation limitation of bridges with ballastless track. The combined measure has been adopted in the actual construction of RGB.