bluuebunny/crossref_metadata_2025 huggingface dataset:
Neutral Mechanical Alignment: A Requirement for Successful TKA: Affirms
Authors: Lombardi Adolph V. , Berend Keith R. , Ng Vincent Y.
Published: September 2011

Restoration of an overall neutral mechanical axis has been a long-held tenet in total knee arthroplasty (TKA). Numerous biomechanical, finite element, and clinical studies have demonstrated that coronal malalignment, particularly varus, is associated with increased strain, higher failure rates, and, in some cases, poorer outcomes. With advances in computer-assisted navigation, 3-dimensional imaging, and patient-specific positioning guides, the potential for greater precision in bone resection and component positioning has rekindled interest in this important issue. Several recently published studies demonstrating no difference in survivorship for malaligned TKAs have challenged the concept of an alignment safe zone. Some surgeons have discussed a paradigm shift in defining optimal alignment. While we agree that compared to several decades ago, there is greater understanding of TKA kinematics and that broad targets for alignment may not impart significant benefit as a dichotomous variable, there are multiple reasons why neutral alignment and classic bone cuts remain valid and important in delivering a successful TKA. In comparison to the preponderance of evidence advocating a neutral mechanical axis and approximately 5° to 7° valgus anatomic alignment, there is insufficient support for reasonably choosing any other target. Although technology has improved surgical precision, it has not eliminated the human factor, and aiming for neutral provides the safest margin for error. The foremost objective of TKA is a durable and well-functioning joint, not necessarily one that replicates normal or the patient’s native condition. While the latter goal is certainly desirable, the priority of the former should never be overlooked.
Potential Positive Effects of Fire on Juvenile Amphibians in a Southern USA Pine Forest
Authors: Brown Donald J. , Baccus John T. , Means D. Bruce , Forstner Michael R.J.
Published: September 2011

Prescribed fire is a common tool used to conserve and manage the integrity of forest ecosystems. We investigated short-term juvenile amphibian capture and body condition changes subsequent to fire (i.e., one prescribed burn and two wildfires) in a southern United States pine forest. We surveyed amphibians and predatory invertebrates before and after fires occurring during summer 2010. We tested for treatment (i.e., control, wildfire, or prescribed burn) and status (i.e., preburn or postburn) differences in 1) genus-level captures, 2) amphibian health (inferred through a body condition index), and 3) predatory invertebrate captures. Bufo and Scaphiopus captures increased in the prescribed burn treatment; whereas, no differences in Gastrophryne captures were observed. We did not detect a burn status effect on amphibian body condition. Predatory invertebrate captures were higher postburn in the control and wildfire treatments. Neither a low-intensity prescribed burn nor high-intensity wildfires negatively impacted short-term juvenile amphibian captures. Further, we speculate that Bufo and Scaphiopus survivorship may have been higher after the prescribed burn.
Reverse Engineering in the Manufacturing of Forming Die
Authors: Yan Zhi Bo , Chen Hong Wei
Published: September 2011

Reverse Engineering, also known as reverse engineering, new products has become an important way for design and development is one of the field of advanced manufacturing in recent years, the research focus. This paper discusses the surface information acquisition, surface reconstruction, CAD model creation and stamping blank reverse key technologies to solve the conventional time-consuming measurements, detection is difficult and costly problem; more complete establishment of a suitable complex stamping die reverse engineering methods and tools, dies for similar products in reverse reference.
PID Parameters Optimization of Pressure and Phear Testing Controller Based on CLPSO Algorithm
Authors: Wu Hong Ji , Hu Zhen Qiu
Published: September 2011

This paper presents an improved algorithm which is Comprehensive Learning Particle Swarm Optimization(CLPSO).CLPSO utilizes a new learning strategy have achieve the goal to accelerate the convergence of the classical PSO.CLPSO algorithm is effective to optimize PID controller’s parameter.The simulation results show its better performance than traditional ways in the PID parameter optimization of a hydraulic system controller.
Research of Computer Aided Design for Anti-Aliasing Filter Based on MATLAB
Authors: Jiang Xi Meng
Published: September 2011

Anti-aliasing filter is widely used in the field of communication and the information collecting system. Generally, anti-aliasing filter is consisted with a low-pass filter, which possesses rapid roll-off rate. In order to ensure that there will be a very smooth amplitude frequency characteristic, the high order Butterworth low-pass filter is adopted to work as anti-aliasing filter. As we know, to design this kind of high order low-pass filter will involve large amount of manual calculation. In order to reduce the manual calculation job, which is meaningless and reduplicated, in this paper, a MATLAB scripts is proposed to establish a model of computer aided design for anti-aliasing filter. To use this MATLAB scripts, the value of parameter for the filter can be easily got according to the design specification.
The Design of Earthquake Engineering Spatial Database Based on GIS Platform
Authors: Ren Ze , Meng Rui
Published: September 2011

GIS (Geographic Information System) is a powerful tool for handling spatial information, and a set of safe and efficient information spatial database is essential for a complete earthquake engineering GIS platform. This article introduces an established method and basic composition for the GIS-platform-based earthquake engineering spatial database.
Sensorless Position Control of Surface Permanent Magnet Linear Synchronous Motors
Authors: Lu Hua Cai , Jiang Ming , Chen Qi Gong , Wei Li Sheng
Published: September 2011

In this paper, a novel sensorless position control for a surface permanent magnet linear synchronous motor (SPMLSM) is presented. The position and speed of the SPMLSM drive is obtained through a closed loop observer by only measuring phase voltages and currents. Estimation of speed is done using difference between estimates of the current derivatives in the dq frame, which calculated two different ways: first using a high-gain observer, and then using the motor model. Estimation of the mover position is done through integrating the estimation of speed. The proposed scheme works in a closed loop fashion. It enhances the allowable initial position error; can be used without any physical modification; does not rely on motor saliency and requires no knowledge of the load. Results from numerical simulations and practical implementation are presented to validate the proposed schemes.
A Novel Apparel Designing Method Based on Graphic Image
Authors: Zheng Qin , Cheng Chuan Qing , Zhu Xiang
Published: September 2011

This article aimed to find a new way to transform the graphic image (drawing, photos, etc) to the pattern parameters of female apparel with raglan sleeve. The correlation and regressive analysis were used to the data in order to find the existing laws between them. The practical examinations demonstrated the good predictability of equations established.
Control Software Development of a Novel Rapid Prototype Laser Sintering System for Fabricating Artificial Bone
Authors: Shuai Ci Jun , Nie Yi , Gao Cheng De , Hu Huan Long , Zhuang Jing Yu , Mao Zhong Zheng , Peng Shu Ping
Published: September 2011

An open motion control software for a novel selective laser sintering system has been developed to fabricate a three-dimensional porous artificial bone with complex shape. It adopts the library functions provided by a motion control card in Delphi 2006. It focuses on the realizations of control for ‘sintering a dot’, ‘sintering a line’ and ‘sintering a surface’ aiming at the characteristics of selective laser sintering. A problem that the transmission length of interpolation commands can not exceed certain value at a time due to constriction by the register capacity of the motion control card has been resolved. The control software has been successfully used in the experiment of laser sintering for fabricating artificial bone. The results show that the selective laser sintering system has high stability and accuracy.
Research on Configuration Design Method of Mass Customization Product Based-on Function-Structure Model
Authors: Yin Qian , Sun Yong Jian , Zhou Wei Zong , Ni Xia Jing , Chen Kun Chang , Li Ren Wang
Published: September 2011

Considering the problem that current configuration design method is mainly faced for professionals, based-on the analysis of different customers’ respective understanding of products and configuration methods, a function-structure configuration method of mass customization product is proposed according to the general design process from function to structure. Meanwhile, in the configuration real-time related analyses and advices are provided customers, which would guide customers to complete configuration design of personal product rapidly. Finally, a wheel lock configuration case is given to illustrate the proposed method.
Assembly Sequence Planning for Aircraft Component Based on Improved Clashes Matrix
Authors: Yang Liu Ying , Zhao Gang , Wu Bin Bin , Yan Guang Rong
Published: September 2011

The aircraft parts contain the information of a great number of curves and surfaces, which makes it a big challenge for the aircraft components’ Assembly Sequence Planning (ASP) processes. The traditional interference matrix has limitation of expressing the assembly direction and can easily lead to the failure of ASP optimization. Hence, an improved interference matrix is provided in this paper to deal with the aircraft ASP problem based on the Genetic Algorithms (GA). With the mainly consideration of assembly time according to the assembly sequence evaluation criteria, the objective function is established and evaluated. This paper presents an application of the method in the aircraft cabin door assembly process supported by an 863 program. Meanwhile, the verification of the approach is shown in the practical example on MATLAB platform.
Prosthetic Modeling of the Femoral Head Based on Reverse Method
Authors: Liu Bin , Huang Zhi Huan , Fan Xin , Li Hao Jie
Published: September 2011

In this paper, a new method for reconstructing the model of the necrotic femoral head is presented. It can reconstruct the optimal femoral head prosthesis model utilizing the reverse technology. This new method not only affords a theoretical model for the accurate operation position fixing in orthopaedic clinic, but also provides an innovative practical means for the individualized manufacturing of artificial femoral head prosthesis.The femoral head is regarded as a sphere. Then, the femoral head's configuration is reconstructed by means of fitting using the data points on the unspoiled acetabulum lunate surface. A spatial dynamic analysis is implemented, it is proved that the sphere fitting model can well satisfy the spatial motion relation between the femoral head and the acetabulum. The experiment results show that this method can well reconstruct the femoral head model of the target patient.
Researches on Modeling and Simulation of Continuous Wave Mud Pulser
Authors: Yuan Fang , Gong Xian Feng
Published: September 2011

Computer simulation of flow fields about “mud pulser” used in Drilling are studied using a dynamic formulation that models the effects of key design variables on rotor torque. Well known field problems are reviewed and aerodynamically based solutions are explained in detail. The solution of problem is studied numerically and the computer model show replicate the main physical features. The simulation focuses on techniques that ensure fast stable rotary movements for supporting fast transmissions of future drilling and logging working.
Numerical Study of a Flap Rudder Based on Turbulence Model LES
Authors: Wu Shu Guang , Liu Hean
Published: September 2011

The flap rudder flow field at Re 1.4×106is calculated using computational fluid dynamics (CFD) method. Large eddy simulation (LES) turbulence model is adopted. The results shows that boundary layer separation phenomenon appears in flap after the gap, and as angle of flap (AOF) is increased, the separation tends to asymmetry, the pressure fluctuation range is becomes higher. There is no eddy in gap when AOF is 0°, but as AOF increases, the eddy in gap appears because of the pressure difference between two sides of the rudder.
A Web-Based Platform for Modular Design of Intelligent Instrument Based on Improved Genetic Algorithm
Authors: Pan Jian , Mao Guo Hong , Dong Jin Xiang
Published: September 2011

The design of new products is a creative work based on designer’s knowledge or experience. This paper develops a web-based design platform for intelligent instrument with the technology of Java and web database. It aims at offering near-optimal solutions of product design scheme that meets user requirement with the selection of module. An improved genetic algorithm with a binary encoding scheme is proposed to accomplish the selection of module more effectively.
Research on the Shortest Path of Mine Emergency Rescue Based on Path Weight Adaptive Ant Colony Algorithm
Authors: Wang Kai , Jiang Shu Guang , Wu Zheng Yan , Zou Wei
Published: September 2011

Finding the shortest path is an important issue of coal mine emergency rescue. In this paper, based on Analytic Hierarchy Process theory, the roadway path weight is calculated, thus, influential factors weight on walking speed by roadway attribute is obtained. The establishment of the roadway equivalent length system constitutes roadway equivalent length adjacency matrix combined with path weight. Using adaptive ant colony algorithm and MATLAB software to simulate local roadway of a coal mine domestic, we get the shortest path in mine emergency rescue system, which is more reasonable and less time needed.
Researching on Synthesis of Epoxy/Montmorillonite Composite Material and Dielectric Property
Authors: Feng You Li , Yu Li Jing
Published: September 2011

Epoxy/montmorillonite composite material was synthetized through intercalated and triethylene tetramine EPIKURETM 3234 was curing agent. A series of nanometer composite material with different amount of montmorillonite were synthetized at certain technology. The dielectric property of composite material was studied. The results show that the dielectric constant increasing with the amount of montmorillonite below 7%; it reaches maximum at 7% montmorillonite, after that, the dielectric constant decreases with the montmorillonite amount increasing.
The Stochastic Resonance Driven by Two Frequency Signals and its Application
Authors: Zhang Mei Li , Lin Min
Published: September 2011

The relationship between the amplitude of the control signal and the barrier height of the bistable system is analyzed. The method of detecting weak periodic signal is proposed using additional control signal constituted stochastic resonance (SR) driven by two-frequency signals. The theoretical analysis showed that adjusting the amplitude of the control signal can change the barrier height of the bistable system and purposely produce stochastic resonance or make stochastic resonance more intense. The simulation and experiment results showed that the method is feasible. An effective method is provided to detect the weak periodic signal in the application of incipient fault diagnosis in machine.
Study on Heterodyne Stochastic Resonance System for Weak Signal Detection
Authors: Yao Jun Jun , Huang Yong Mei , Hu Li Qing , Lin Min
Published: September 2011

The method based on stochastic resonance is a newly developed signal processing technology. Different from other methods by restraining the noise, it takes full advantage of the noises to strengthen the weak signal to improve SNR of the system. Based on stochastic resonance theory, a heterodyne system is presented in the paper to detect the frequency of the weak periodic signal. The simulation results manifest that the method is effective and the system parameters have extensive influence for frequency measurement. The parameters of the system are investigated for optimizing system design and weak signal detection.
The Realization and Application of Mineral Resources and Reserves Estimation Based on MapGIS
Authors: Zhang Jian Keng , Wu Qian Hong , Deng Ji Qiu
Published: September 2011

In terms of the reality that the immature and simple manipulations of MapGIS, the expensive price, complicate operations and calculations of foreign software on reserves estimation as well as the limit of the mine techniques, an estimated module of minerals reserves is made in correspondence with the actual demand. This module is developed through MapGIS re-develop tools and relevant GIS techniques on ".Net" platform and with the utilization of visual programming language C#, in order to realize the functions of automatic mapping and output of prospecting line profile map, the interactive delineation of ore bodies, the estimates of the mineral reserves and the interactive display between map and attribute data, which will greatly improve work efficiency of disposal of the geological data and estimation of resources and reserves.
Preliminary Analysis on Inclined Concrete-Filled Steel Tubular Stub Columns with Circular Section under Axial Compression
Authors: Ren Qing Xin , Lv Yan Bo , Jia Lian Guang , Liu De Qing
Published: September 2011

This paper reports a finite element analysis of the compressive behaviour of circular inclined CFST stub columns. A set of test data were used to verify the FE modeling. Typical curves of vertical load versus longitudinal strain, stress distributions of concrete, interaction of concrete and steel tubes, as well as effects of important parameters that determine failure modes of the composite columns were investigated. The results clearly show that the FE modeling is available for predicting the capacities of the circular inclined specimens.
Study on the Film Coating Methods on Inner Surface of Long-Straight Tubes
Authors: Zhang Shi Wei , Han Yong Chao , Han Jin
Published: September 2011

In this paper, a variety of previous coating methods are reviewed for the film coating on the inner surface of long-straight tubes. A new magnetron sputtering method is introduced for the film coating in the thin and long tubes made by the conductive and non-magnetic material. The coating process of this method is as follow: the long rod target connecting the cathode is penetrated in center of the coated tube connecting the anode; a solenoid coil with DC exciting current is set outside of the tube so the steady axial magnetic field is generated in the ring discharge area between target and the tube; the working gas flows through the tube from one end to the other, the gas discharge and the magnetron sputtering coating occures in the region corresponding to the solenoid coil; the homogeneous film is obtained on the whole inner surface of the tube when the solenoid coil moves along the tube. The principle and structure of the coating system are analyzed. The distribution of electromagnetic field and electron trajectory in the electromagnetic field are calculated within the discharge region. And distribution of the magnetic field is simulated by COMSOL multiphysicsn software.
High Order FE Analysis for Shear-Lag Effects of Wide Flange Box Girder
Authors: Cai Song Bai , Kim Chang Wan , Shen Pu Sheng
Published: September 2011

Although lots of methods have been developed for the analysis of shear-lag effects of wide flange box girder, so far not many have very successfully achieved both computational efficiency and generality of computational model yet. This paper presents formulation and computation of a high order, high performance element of 14 node, 56 DOF for large box girder. The structural analysis program has been completed in Fortran on the formulation of element stiffness matrix of folded membrane theory. The shear lag effects under concentrated loading, uniform loading and triangular loading has been calculated by the program and accurate result has been obtained for the wide flange box girder. This indicates that the formulation for the high order, high performance element is reliable, and efficient for application to high accuracy engineering analysis of membrane structures.
Analysis of Aircraft Composite Structural Health Monitoring and Life Prediction Technology
Authors: Tao Xiao Chuang , Lu Chen
Published: September 2011

Along with the constantly updated aircraft structure design, higher performance and reliability design indexes as well as usage of a large portion of new materials especially lightweight composite materials put forward higher requirements for aircraft structure safety. The damage detection, diagnosis, forecast and management become an important part of aircraft Prognostics and Health Management(PHM).In order to better build the Structural Prognostics and Health Management system of a new generation aircraft for the improvement of security, task reliability and economy, this paper introduced the development situation of aircraft composite structural health monitoring and life prediction technologies, classified the existing technologies, and then discussed the principle, quality point, applicability and application situation, finally, pointed out several critical issues which still need further study.
MBD Based Automotive Products Process Planning Technology
Authors: Zhou Qiu Zhong , Deng L.Y.
Published: September 2011

Process planning is the important link in connection of automotive product development process design and production, and the expression and transfer of process planning information is a key affecting the development process. For promoting the process planning viability, this paper puts forward the idea of MBD based automotive products process planning information expression and its transfer method. The connotation and essence of MBD which completely expresses product definition with the integrated three-dimensional entity model and use the label and attributes solution to express the products non-geometrical manufacturing information in three-dimensional tagging, is expounded. Based on the analysis of process planning process, the concept of MBD process model and the joint expression way with mark and attributes to solve the expression of process planning information in the three-dimensional entity model was put forward. At the same time, the MBD based process planning process was expounded, as well as the expression method of all kinds of process planning information in MBD process mode.
Design and Realization of Automatic Mapping System for Borehole Data
Authors: Deng Ji Qiu , Zuo Zhong Hao , Yang Li , Wu Qian Hong
Published: September 2011

Drawing geologic maps (profile\plane\column map) are high-workload and low-accuracy task. Based on a series of research on previous study, system architecture, database and key algorithm, an auto-mapping system has been developed by interacting with MS SQL database, the framework of MAPGIS and visual programming tools. The actual-measured data in ZhiJiaDi district, Shanxi Province, China is chosen as a case study to demonstrate the validity and capability of the system. The test results compared with the manual-mapping one in GEMD method shows that the key algorithm are reliable, and this new system not only provide a user friendly interface, but also have the ability to satisfy requirement on the geologic maps with high accuracy, efficiency and conveniences.The geologic maps (profile\plane\column map) are the most basic forms of expression for the geological content, which play an important role in guidance of geological exploration, metallogenic prediction and decision-making [1]. In China, various maps are manually drawn in MAPGIS platform according to the paper map provided by the geologists, which results in large workload, complicated process and inaccuracy. It seriously affects the quality of work for computing of resources amount, metallogenic prediction and mine design, etc. Therefore, research on a new automatic mapping system which is convenient, efficient and accurate becomes the urgent need for domestic mineral system.
Simulation of Liquid Flowing over Surfaces with Micro-Structure
Authors: Xi Zhi Jun , Li Gang
Published: September 2011

The exist shear-free air-water interface at the fluid-solid houndary is one important reason for drag reduction of ultrahydrophobic surface. Rectangular microchannel flows with various periodic micro-structured wall by introducing velocity slip boundary condition at low Reynolds number is investigated through computational fluid dynamics simulations(CFD). The purpose of the current study is to numerically find out the effects of periodic micro-structured wall on the flow resistance in rectangular microchannel with the different spacings between microridges ranging from 15 to 60 μm. The simulative results indicate that pressure drop with different spacing between microridges increases linearly with flow velocity and decreases monotonically with slip velocity; pressure drop reduction also increases with the spacing between microridges at the same condition of slip velocity and flow velocity.
FEM Simulation of Anisotropic Parameters Influencing the Earing in Sheet Metal Deep Drawing Process
Authors: Chen Lei
Published: September 2011

Earing is often undesirable in the production of deep drawn containers because it results in a nonuniform cup height. A finite element model for earring analysis is developed considering only the flange area of the sheet. It was found that the draw-in depth of the flange increases with the increase of the r value, and it remains invariable when r value is larger than 2. With the increase of the r value, the max thickness decreases and the min thickness increases. If △r>0, four earings are formed. If △r =0, the material characteristics in all the planar directions are same. The flange uniformly flows into the die cavity, no earing is formed. If △r<0, four earings are formed. The earing distribution is dominated by r0, r45 and r90. Both r and △r have much effect on the earing distribution.
Simulation Analysis on a Special Air-Heating Collector
Authors: Qiu Lin , Zou Yue , Huang Li
Published: September 2011

It is the numerical simulation of the thermal properties of a special polygonal collector plate with hole in air-heating. With the ray-tracing solar load model provided by Fluent, use radiation heat transfer equation to solve the solar radiation, and then consider loading radiation heat into the source terms of the energy equation. In the transition season, under the mode of operation of complete new wind, through the study of air flow and heat transfer in the collector box, the paper discusses and analyzes the temperature and velocity fields, thermal effects, as well as the wind speed and solar radiation and other related factors in different collector modules of the collector plate.
Adaptive Friction Compensation for Mechanical Systems with Unknown Deadzone
Authors: Cai Jian Ping , Zhang Yi Jun
Published: September 2011

Friction exists in a wide range of physical systems. On the other hand, deadzone hysteresis nonlinearities seem inevitable in practice especially in mechanical system. In this paper, a class of mechanical systems with dynamic friction and unknown deadzone hysteresis are considered . A state feedback control scheme is proposed by using backstepping techniques. In this control scheme, an approximation of deadzone model is constructed and we use a linear part and a bounded part to approximate hysteresis input. The stability of closed-loop system and output tracking performance can be ensured by this control law and update laws of unknown parameters and the upper bound of external disturbance.
Dynamic Modelling and Simulation of Pneumatic Actuators
Authors: He Yi Fang , Yu Sha Nen , Shang Qun Li , Deng Fu Kai
Published: September 2011

Pneumatic operated spring-diaphragm actuator is the most popular acting device in industrial applications. Precise modelling of pneumatic actuator continues to remain a major challenge because of its nonlinear characteristic. In this work, the characteristics of pneumatic actuator are analysed in details, and then the dynamic model, which considers effects of stem friction and compressibility of air, is developed. Computer simulation and experimental tests have been carried out on the developed model. The results show the model has a better performance.
An Experiment-Based Comparative Study between Mechanical Testing and Artificial Testing for Putonghua Proficiency Test
Authors: Jiang Lan , Wang Xiao Nong , Liu Hong Chao , Zhang Chuan Dong , Kang Shi Yong
Published: September 2011

This paper attempts to research the main differences between mechanical testing and artificial testing for Putonghua Proficiency Test by comparing the data acquired through experiments, with an analysis of the advantages and disadvantages of the two testing forms respectively. The findings may serve as a reference for future efforts to make Putonghua Proficiency Test more standard, scientific, and modernized.
A FPGA-Based Motion Control IC for X-Y Table
Authors: You Bao Shan , Liu Kai Feng , Zeng Feng Lian , Pei Li Ying
Published: September 2011

The new generation of Field Programmable Gate Array (FPGA) technology enables to embed a processor to construct a System on a Programmable Chip( SoPC). A stepper motion control IC for X-Y table using SoPC technology is proposed in this thesis. The proposed motion control IC contains two modules. One module performs the functions of schedule and logic control. Due to the need of complicated control algorithm, it is implemented by software using Nios II embedded processor. The other module performs the functions of interpolation, acceleration and deceleration. Due to the need of high performance, this module is implemented by Programmable Logic Device (PLD) in FPGA. The use of SoPC technology can make the motion control IC of X-Y table more compact, high performance and low cost .
A New Approach to Reconstructing 3D Solid from the Two 2D Views Based on AutoCAD
Authors: Zhao Hong Sheng , Wu Ya Xian , Wu Yun Zhen
Published: September 2011

This paper presents a new approach to reconstructing 3D solid model from the two given 2D orthographic views based on AutoCAD, which is much more effective and high efficient for a special kind of compound object than the currently existing ways. The approach emphasizes integrated operating of AutoCAD software and basic knowledge of engineering drawing with no needs for complicated computation and 3D rich imagination and reconstruction. Using this approach, the 3D solid model can be reconstructed effectively and efficiently from the two given 2D orthographic views by several steps of simple operation on computer on the basis of judgment. The research work provides a theoretical possibility for the automatic reconstruction of 3D Solid model of such compound objects, and a simple and practical 3D solid model-reconstructing method for engineers and learners of engineering drawing.
Multiple Digital Watermarking Techniques for CAD Models
Authors: Liu Nan , Zhang Yin , Zhang San Yuan
Published: September 2011

Digital watermarking technique is becoming one of thehot research fields of copyright protection for CAD graphic data under the network environment. Along with its development there came a new technique called multiplewatermarking. It combines several single watermarkingalgorithms and has lots of advantages such as high capacity, good robustness and various functions. In this paper we will discuss several watermarking techniques for CAD models and eventually propose a multiple watermarking-based digital rights management system that would test our techniques.
Research of the Finite Element Method to Welding Simulation in Virtual Manufacture Environment
Authors: Yang Jian Guo , Fu Wei , Gao Jia Shuang , Liu Xue Song , Dong Zhi Bo , Fang Hong Yuan
Published: September 2011

A new thinking was introduced that combine finite element analysis(FEA) for welding process simulation with virtual manufacture(VM), it is significant research according to comparison of FEA for welding process and VM, parameters input by FEA pre-processor and by VR technology, FEA results cab be shown by FEA post-processor and by VR technology. The framework for welding FEA based on VM was proposed and some key technologies were also discussed.
Systematization Education Discussion and Application Research of Architecture Major in Higher Education
Authors: Wang Bin , Zhao Xia , Bian Xiao Wen , Li Jian Guo , Ren Zhao Jun , Liu Wei
Published: September 2011

In the industry division standard GB/T 4754-2002, construction includes two types. They are E- construction and K-construction, especially the booming real estate has been the first pillar industry in recent years. The industry development provide capacious space for the talents that express in the enrollment amount of colleges and universities and the incrementary ratio is 20% higher than other traditional professions. As the important education combination of architecture professional ability, people with professional skill needs to grasp opportunity of high-speed development to adjust the industry requirement. That will train students to reach professionalization, specialization and pay attention to the talents training systematization that students can express their innovation and business establishment in the architecture industry. This article will emphasize in the systematization education mode and application of architecture major in higher education, describe the establishment of projectization education platform, sectional type education application and courses resource accumulate and integration then to provide new opinion and method to the higher education revolution.
Effect of Limestone Powder on Autogenous Shrinkage of Concrete
Authors: Wang Bin , Ding You Ping , Gao Jing , Sun Jin Fang , Cui Miao Miao , Han Long
Published: September 2011

The effect law and mechanism of limestone powder on autogenous shrinkage of concrete was studied. The results indicate that limestone powder accelerates autogenous shrinkage speed of concrete on which effect of fineness is little, and limestone powder reduces autogenous shrinkage which decreases with the increase of fineness. The change law of autogenous shrinkage of concrete is consistent with that of chemically combined water of paste. Autogenous shrinkage of concrete is also divided into 2 stages according to the initial vapor saturated stage and subsequent reduction stage of interior relative humidity, with both showing a good linear correlation at each stage.
The Study of Foamed Concrete with Polypropylene Fiber and High Volume Fly Ash
Authors: Sun Hai Yan , Gong Ai Min , Peng Yu Lin , Wang Xin
Published: September 2011

The physical, mechanics, deformation, heat properties, pore structure of foamed concrete with polypropylene fiber and high volume fly ash were tested with the different water/binder ratio, perlite, foaming agent, polycarboxylate water reducer. The results showed that when adding foaming agent, PCA into foamed concrete with lower W/B ratio, it is possible to research the function integration foamed concrete with lower bulk density, higher compressive strength, smaller drying shrinkage, thermal insulation and waterproof.
Analysis on Reasonable Structure of Main Girder of Harp Shaped Cable-Stayed Bridge without Backstays
Authors: Chen Ai Jun , He Guo Jing
Published: September 2011

Harp shaped cable-stayed bridges without backstays are popular due to their beautiful and unique styles; they employ leaning tower columns to balance the constant and movable loads on the decks and are not provided with backstays, so they are beyond the traditional bridge design philosophy. In this paper, we discussed the reasonable structure of the main girder of Changsha Hongshan Bridge – a harp shaped cable-stayed bridge without backstays through changing the design parameters of the main girder in respect of design so as to provide important reference for design of this kind of bridges, and the research mainly related to such aspects as the structure selection for and section design of the main girder, the influence of overweight of main girder on the force on the structure, the length of non-cable area of the main girder, the span of auxiliary hole, etc.
Model Test for the Pylon of Cable-Stayed Bridge with Double-Tower-Connected and Four Cable Planes
Authors: Xu Zhou Yuan , Zhao Ren Da , Wang Xiao Yang
Published: September 2011

Yongjiang Bridge in Ningbo is a double-tower-connected cable-stayed bridge which new structure system is very complex and the first one in China. In order to roundly investigate the structural behavior of the double-tower-connected, 3:40 scaled-down model test and space finite element analysis were presented. Test objective, model design principle, the ratio of similarity, test cases, loading method and the strain test point arrangement were introduced in detail. By comparison of two unfavorable test cases, most test data were quite agreeable with the theoretical data, which verified the design concept. The results indicate that the whole resistant behavior is well and the structure is safe and reliable.
Construction and Quality Evaluation of Prestressed High-Strength Concrete Hollow Slabs
Authors: Zhao Shun Bo , Liu Chun Jie
Published: September 2011

Combined with the application of high-performance concrete in bridge engineering, the construction technics of pretensioned prestressed high-strength concrete (PPHC) hollow slabs with new section is summarized. The qualities of concrete in C80 strength grade are statistically analyzed based on the precast of 75 PPHC hollow slabs for two bridges. The results show that it is reliable to precast PPHC hollow slabs for bridge construction.
Experimental Study on Ductility and Dissipative Capacity of AAC Block Load Bearing Walls
Authors: Yu Jing Hai , Wu Shou Xiang
Published: September 2011

Based on the experimental investigation of quasi-static test of 6 AAC block walls and obtain the load-displacement experimental results, the deformation behavior and dissipative capacity of the walls due to different height to width ratios and vertical pressing stresses are studied and analyzed, the comparisons and analyses with other block walls’ deformation behavior are also carried out. The results indicate that AAC block walls’ dissipative capacity is directly proportional with vertical pressing stresses and the deformation behavior is otherwise, the diversification of height to width ratios can change the breaking form of block walls and affect on ductility and dissipative capacity. The ductility of AAC block walls is better than other block walls.
Study on Dynamic Characteristic of 64m Railway Steel Truss Bridge on Expanding Heavy-Load Transport Condition
Authors: Sun Zhi Jie , Shen Jun Min , Zhao Jian Bin , Su Zhong Ming
Published: September 2011

Through theoretical calculation, systemic analysis of dynamic performance of the 64m single and double line railway steel truss bridges on the expanding condition and conventional condition. Contrast and analysis the main dynamic performance parameters of bridges on the two kinds of operating condition. In 64m steel truss bridges of Shuozhou-Huanghuagang Railway application practice proves that on expanding heavy-load condition, the main dynamic performance parameters of bridges are slightly larger than conventional condition, but the variation law of vertical acceleration of mid-span is different.
Structural Optimization of Prestessed Concrete Continuous Box Girder Bridges in Highway Viaduct
Authors: Xing Hong Yan , Peng Wei
Published: September 2011

According to using status of short span concrete bridges commonly used in highway viaduct, structural finite element analysis taking account of some parameters like connection between pier and beam, pier height, transverse bearing spacing and early support differential settlements was given based on existing cracking beams of small box girders during construction and operation. Some structural optimization recommendations and construction control suggestions was proposed. The study results are constant well with the data of the survey results and the actual status of projects, which may be taken as reference for similar projects in the design and construction.
Analysis of Dynamic Characteristics and Influence of Parameters on Suspension Arch Bridge
Authors: Miao Tong Chen , Xu Wen Tao , Zhang Xu
Published: September 2011

In this paper, the dynamic characteristics of short-span suspension arch bridge are analyzed, and the influence of parameters for constant-load variation, stiffness condition and displacement boundary condition to the dynamic characteristics is studied; the main design parameters of influencing dynamic characteristics of suspension arch bridge are put forward. The study results provide the theoretical basis for the optimization design of suspension arch bridge.
Evaluation for Flood Control Influence on Niujiazhuang Bridge
Authors: Zhang Xin Zhong , Jing Rui Li , Tang Ke Dong
Published: September 2011

It is necessary to evaluate the flood control impact of a river-crossing bridge . Aiming at the problems exited in the evaluation,the analysis and discussion on the procedures,methods contents and related issues of the evaluation are made here by taking a bridge over branches of the XiaoheRiver for example.At the same time,the feasible engineering measures are proposed for building of the bridge,which will be applied to similar projects in the future.
A New Moisture Keeping Method for Marine Concrete Curing
Authors: Guo Bao Lin , Kong Xiang Ming , Han Yu
Published: September 2011

Cover concrete quality is very important for marine structures, which determines the beginning time of reinforcement corrosion and the life of the structure. The very early age continuous moisture keeping is essential for cover concrete properties develop; otherwise the long-term performance will be reduced heavily. There are many moisture keeping curing methods, but the drawbacks of traditional curing methods make them confined to use in marine environment concrete structures. A kind of moisture keeping membrane which can absorb and hold 100～5000 times of dead-weight water, and impede water evaporating outside with polyethylene film. The results of mercury intrusion porosimetry test and scanning electron microscope show that the new curing product can improve the concrete density decrease the connection degree of pores and the quantity of harmful pores content. Compared with other product on sales, the wet-keeping time can be adjusted and can be used repeatedly and continuously are the distinguishing features, which make it popular in some marine projects.
Interpreting Ultimate Capacity of Driven Piles with S-lgt Curve and Davisson Offset Limit
Authors: Wang Dong Yuan , Zhao Jian Jun , Zhou Yu Ming , Lu Li Qiang
Published: September 2011

This paper explores the methods used widely in China and western world interpreting the ultimate capacity of driven piles based on axial static load tests. A database consisting of 57 prestressed high- compression-capacity concrete pipe piles, which are widely used in soft soil ground conditions for building and transportation projects in China, is built. Two methods widely used in China and western world to interpret the ultimate capacity of driven piles based on axial static load testing data, S-lg(t) curve and Davisson Offset Limit, are applied to the database. Findings indicate that both methods work well and reach almost the same estimation. Conclusions suggest that both academia and industry of China and western world should take the advantages of the methods and apply them to engineering practice.
Analysis of Pounding Response for Simply Supported Skew Girder Bridge under Earthquake
Authors: Sun Qing Kai , Qi Xing Jun , Liu Yi
Published: September 2011

Under the earthquake, pounding between the beam and the bridge abutment causes great damages to skew girder bridge, and current study on pounding response is still less as the collision effect is complex. In order to study the displacement and collision force under Elcentro and Tianjin ground motion, a three-dimensional finite element computational model for seismic pounding of a 16m simply supported skew girder bridge was established and nonlinear time-history analysis was carried out with pounding element designed to simulate the pounding effect between beam and abutment. The results show that the displacement of side beam is more than that of middle beam in simply supported skew girder bridge. The maximum collision force of the side beam is more than that of middle beam, and the beam pounds the abutment several times. Appropriate expansion joint width should be set according to the displacement of the side beam when the expansion joint designed.
Proposed Standard Fatigue Truck in Montane Speedway of Southwest China
Authors: Zhong Ji Wei , Huang Kun Quan , Li Xing Xin
Published: September 2011

The fatigue truck model is an important parameter in a fatigue evaluation, a 3-axle fatigue truck model was developed based on the weigh-in-motion traffic data and an analytical bridge model in the montane highway of Southwest China. The truck traffic data shows that the fatigue damage was dominated by the 6-axles trucks,a 3-axle fatigue truck model was developed based on the 6-axle truck statistic data,the damage accumulations caused by the Proposed fatigue truck righty meet the actual damage accumulations. Based on the cumulative probabilitie of the moment ranges, the peak stress range is suggested to be a stress level at 3 times of the effective stress range because of overload,however,the ratio of the effective stress in AASHTO was 2 times.The damage accumulations obtained from the simulation of the truck database were compared with BS5400,AASHTO and Proposed fatigue truck, Proposed fatigue truck and AASHTO fatigue truck with the actural daily flow of trucks are suggested in the montane speedway of Southwest China ,BS5400 is impropriety which relatively overestimate the damage.
The Link Dividing Method for Traffic Information Based on Floating Car
Authors: Cao Wen , Meng Wei Can
Published: September 2011

The technologies of traffic information collection based on GPS equipped floating car have been become one of the main important means for real-time collecting traffic information in intelligent transportation system. So, the electronic map of route network is important to collect traffic information. As present, the link dividing methods can’t take into account the different conditions of traffic flow and the different attributes of the route. This paper presents a novel link dividing method: Firstly, the speed of the floating car history track is regarded as a stochastic and its frequency spectrum is obtained using Fourier transform; Secondly, the optimal sampling intervals of the link dividing are obtained using the frequency spectrum of speed and Shannon sampling theory; Finally, the novel link dividing model is founded based on the optimal sampling intervals and the attributes of the routes. This method not only considers the different conditions of traffic flow, but also distinguishes the different traffic flow of the different places of a link, which can improve application effect of the route traffic conditions and vehicle dynamic navigation.