bluuebunny/crossref_metadata_2025 huggingface dataset:
Shafts Parameter Optimization Design for Lunar Rover Wheel-Leg Planetary Mechanism
Authors: Wang Yong Ming , Bao Chuan Hui , Fan Tong Hua
Published: November 2012

Taking the wheel-legged lunar rover based on double-half-revolution mechanism as a research object, this paper has made a dynamics simulation for the simplified virtual prototype model of lunar rover under several typical road conditions, with the purpose of obtaining the mechanical data of the wheel-leg planetary mechanism shafts. On this basis, this paper established the finite element analysis model of the wheel-leg planetary mechanism shafts, and analyzed their stress by using finite element analysis software ANSYS. Based on ANSYS Parametric Design Language (APDL), the optimization design for the above shafts were done combined with the least-square approximation optimization method. The results show that the optimized shafts not only meet the strength requirement, but also their weights are about 30% lower than the original, which will provide a new and effective way for optimizing the whole wheel-leg structure of lunar rover.
Study on Automatic Planning of Truck-Mounted Concrete Boom Pump System
Authors: Zhang Si Qi , Zhou Shu Wen , Sun Jun
Published: November 2012

In many cases, pouring concrete automatically instead of manually will lessen the operator’s labor intensity and increase productivity dramatically. An automatic pouring system was schemed in this paper, as well as the planning of pouring trajectory. A simulation model was built based on virtual prototyping, and the impact of new automatic pouring system on the boom system was verified with the co-simulation method. Since the complexity of the work environment, the obstacle avoidance of boom system was analyzed and planned. A 3D program based on virtual reality technology was built to simulate the automatic pouring process.
Numerical Simulation and Study on Three-Dimensional Flow Field of Wind Turbine Impeller
Authors: Wang Feng , Liu De You , Zhou Ling , Qian Xiang Dong
Published: November 2012

hree-dimensional aerodynamic performance of wind turbine impeller is one of the most important elements in the wind turbine design process; its accuracy directly impacts the efficiency and stability of wind turbine operation. As the current numerical simulation for three-dimensional aerodynamic performance of wind turbine impeller does not fully consider the impact of the rotation effect of the wind turbine and other factors, a relatively large calculation error can be resulted. In this paper, a 1.65MW Vestas wind turbine was taken as an model, and design process of wind turbine blade was made. Also, three-dimensional numerical simulation was made to get a comprehensive dynamic performance of the wind turbine, and the influence of wind turbine power and wind farm efficiency by the pitch angle and wind speed were made.
Poly Gate Proximity Effect Modeling for 40nm CMOS
Authors: Li Xi , Ren Zheng , Wang Ming Juan , Zhou Hui , Sun Li Jie , Hu Shao Jian , Shi Yan Ling
Published: November 2012

A new compact and scalable psp model for the layout proximity effect of poly gate in 40nm CMOSFET is proposed. This model takes into account the impact of gate space and neighboring gates number on mobility and flatband voltage. With the silicon verification, saturation current change up to 5%–7% and flatband voltage change up to 6-8mv is modeled in the constructed model. Vthlin, Idlin and Gmmax are also monitored. These good results show the importance of the new model for circuit design in advanced CMOS node.
A Novel Dual-Mode Microstrip Bandpass Filter with a Pair of Equal Crossed Slots
Authors: Li Su Ping , Chang Cheng Guo , Wu Wei
Published: November 2012

A novel dua1-mode microstrip bandpass filter with two triangle corner cuts and a pair of equal crossed slots is proposed. The performance of the designed filter is studied in detail. The proposed filter structure uses a single patch without coupling gaps. The center frequency is about 2.11GHz. The 3dB relative bandwidth is 9.95%, and the minimum insertion loss in the passband is 0.12dB. Two transmission zeros can be implemented on both sides of the passband. The insertion loss is l0dB within 2.04-2.18GHz. The effect on the filter’s performance by changing filter parameters is studied. The results show that this new filter can provide a low loss and make miniaturization easy.
The Pretreatment of Ramie Fiber Material with Supercritical CO2 Fluid
Authors: Zheng Guang Hong , Zhang Zhe Rong , Zhao Xi , Hori Teuro
Published: November 2012

This study presents a new application of supercritical CO2(scCO2) fluid technology for the pretreatment of ramie fiber materials. It was proved that the scCO2fluid could prominently eliminate the impurities of the ramie fibers. In particular, the lignin of ramie fibers, which usually needs to be removed in strong alkaline solutions, could be greatly eliminated by the scCO2fluid, especially in the presence of some swelling agent. The pretreatment with scCO2fluid resulted in the swelling and expansion of ramie fibers, which favors the further dyeing or finishing of ramie fabric.
Study of Impact of Gas Cooler Cooling Circuit on Heat Transfer Performance
Authors: He Bing Qiang , Liao Chun Ling
Published: November 2012

Experimental study on the structure and characteristics of cooling circuit of full-aluminum parallel flow gas cooler. The experimental tests on the built cell-type and ternary GCMCPF are conducted. In the heat transfer processes of the cooler with different circuit structures, the impact of CO2 refrigerant side flow resistance and the mass flow on the heat transfer performance of gas cooler is measured. The results show that the ternary type GCMCPF structure can enhance the heat transfer for CO2 fluid at the weak heat transfer area in the cell-type GCMCPF. Within a certain range of mass flow, the former heat transfer is 1.5 times the later one, and the structural sizes of GCMCPF can be reduced in the same requirements for heat transfer.
Dynamic Anti-Windup Design for Missile Overload Control System
Authors: Shi Xian Jun , Zhao Hong Chao , Xu Ke Wen
Published: November 2012

The former research on the overload control system of a supersonic missile didn’t consider actuator saturation. In order to reduce the windup effect caused by actuator saturation, we developed a dynamic anti-windup compensator. The overload control system design adopted a two-step approach. Firstly a sliding mode controller was designed ignoring the saturation. Secondly a dynamic anti-windup compensator was designed. It added to the control system to reduce the windup effect. It disengaged the actuator fast from saturation phase after the actuator entered saturation. Simulation results showed that the dynamic anti-windup compensator reduced 52% of saturation time of the control system. Hence the performance of the overload control system is improved effectively.
Research on the Algorithm of Aviation Emergency Rescue under Major Disasters
Authors: Xia Zheng Hong , Pan Wei Jun
Published: November 2012

The reason of inefficient of current aviation emergency rescue was analyzed in this paper, and the establishment of a three layers of emergency rescue system with the background of civil aviation management system was proposed, under which the aircraft allocation algorithm between rescue center and disaster was studied, and also the course design algorithm and aircraft flight algorithm. These algorithms can improve the efficiency and safety of aviation rescue greatly, which laid a significant basis for the establishment of the emergency rescue plans under major disasters.
Based on the Topography Image Segmentation Level Set Method
Authors: Zhao Min Rong , Zhang Xi Wen
Published: November 2012

Image segmentation is a classical problem in image processing and image analysis, image-based 3D reconstruction techniques has become a hot research topic segmentation effect directly affects the accuracy of the model after the three-dimensional reconstruction. The complex topography, constitute the main part of the contour of the topology change of the complexity and randomness, it is powerless to describe the shape of the change process parameters of the curve or surface. Thesis level set theory to split the topography image, and laid the foundation for image-based 3D terrain reconstruction.
Application of Adaptive Enhancement Means in Head and Neck CR Image
Authors: Zhang Ming Hui , Zhang Yao Yu
Published: November 2012

Digital CR of head and neck overcomes the disadvantage of regular X-ray radiography, which can not reveal bone and soft tissue position deficiency in one exposing, and reduces the X-ray radiation dose. Meanwhile, various factors cause the decline of image quality, and images must be enhanced in order to meet demands of doctor's clinical diagnosis. The general enhancement algorithms don’t consider body's structure differences and density characteristics. A new adaptive CR enhancement algorithm was proposed in this article, and head and neck CR images were processed with this method and compared with linear unsharp masking method. The experiment proves that the details of CR image enhanced were abundant and enhanced CR image had good visual effect, SNR was high, as well as detail variance /background variance (DV/BV) indicating that this algorithm is suitable for head and neck CR medical images
Numerical Analysis of Ferrofluid Based Leaning Sensor
Authors: Cui Hai Rong
Published: November 2012

Ferrofluid is usually used as an inductive core in leaning measurement sensor because it is provided with both liquidity and magnetism. This paper presents a ferrofluid based leaning sensor, detecting small inclination angles against horizontal plane. An approach of numerical simulation for simulating output characteristic of this kind sensor is proposed. From the result of simulation, it shows, after structural parameters are decided, output voltage signal is linear with pumping frequency which appropriate span is 500Hz～2kHz while output voltage signal is linear with leaning angle.
The Design of TIG-AWP Based on Inverter and DSP
Authors: Li Chun Tian , Luo Yi , Du Chang Hua , Gan Gui Sheng
Published: November 2012

The main circuit of tungsten inert gas (TIG) arc welding power (AWP), which is mode of the inverter for intermediate frequency and full-bridge IGBT, is designed based on DSP (Digital Signal Processor). The control designing, also based on DSP, include the sampling signal circuit, the control circuit for external characteristics, the PWM (Pulse-Width -Modulation) control circuit of TIG-AWP, the IGBT drive circuit and etc. This designing can strengthen the reliability of feedback regulation property on TIG-AWP; can enhance the stability of the parameters from the power system. The experimental result shows that the designed TIG-AWP has good feedback regulation and stability properties during the TIG welding process.
On Sonar Image Processing Techniques for Detection and Localization of Underwater Objects
Authors: Weng Li Yuan , Li Min , Gong Zhen Bang
Published: November 2012

This paper presents an underwater object detection and localization system based on multi-beam sonar image processing techniques. Firstly, sonar data flow collected by multi-beam sonar is processed by median filter to reduce noise. Secondly, an improved adaptive thresholding method based on Otsu method is proposed to extract foreground objects from sonar image. Finally, the object’s contour is calculated by Moore-Neighbor Tracing algorithm to locate the object. Experiments show that the proposed system can detect underwater objects quickly and the figure out the position of objects accurately.
Research of Image Acquisition and Processing System of the Flow Meter Verification Equipment Based on Embedded Linux System
Authors: Sun Lu Yong , Lin Chun Kuan , Chen Kai
Published: November 2012

Aiming at the requirement of technique improvement for the flow meter verification equipment, the image acquisition and processing technology is combined with the embedded Linux system for obtaining the reading value of the verifying flow meter. A low-cost and moderate function image acquisition and processing embedded system was designed. The system runs on the ARM9 which is embedded with Linux operation system. It can realize the image acquisition of the reading value of the meter, image preprocessing, character positioning, segmentation and recognition based on OpenCV advanced programming, and then display the recognized data results. The research of our project may have a certain reference value for the application and exploring of the image acquisition and processing based on embedded systems in the instrument application.
Numerical Simulation of Projectile Accelerating Process in Aftereffect Period
Authors: Zhong Yang , Wang Liang Ming
Published: November 2012

The initial velocity of a projectile has great effects on the weapon performances and it influences firing accuracy. It is meaningful to know the motion of projectiles in after-effect period. This article studies the motion of the projectile by using a Six Degrees-of-Freedom rigid model and chimera method, which is suitble to simulate large-scale deplacemengt of projectiles. The results of the simulation show that the velocity of the projectile increases rapidly first and decreases slowly after reaching the peak value.
Static Finite Element Model Updating for Special-Shaped Bridge Based on Response Surface Method
Authors: Liu Han Bing , Song Yan Jun , Gong Ya Feng
Published: November 2012

The establishment of an effective finite element model for bridge structure is essential in the health monitoring system for Bridge. A new updating method for static model using response surface method is proposed in this paper, and the main procedures are given with an example of a special-shaped bridge. Firstly, the bridge deflection and strain data in designed load case are obtained. Several groups of combined parameters which are chosen based on the principle of uniform design method are selected to conduct calculation through finite element software. Finally through response surface fitting and optimization, the updated bridge finite element model is obtained. The results show that the updated model is approximate to the real bridge and this updating method is rational and practical.
Pedestrian System of Singapore and its Enlightenment
Authors: Zhang Li Chao , Li Chao Yang
Published: November 2012

Walking, as the most fundamental trip mode of humanity, is also a trip mode with no energy consumption, no emission and good for health. With the deterioration of the environment of pedestrian transportation in China, the citizens are looking forward to building a safe, harmonious, high-quality pedestrian environment. By analyzing the successful experience in planning, design, construction, management and other aspects of pedestrian system in Singapore, the paper has summarized the beneficial enlightenment on propaganda, education, land use, planning, design, laws and regulations, which will provide reference to green transportation and living trips of citizens for the cities in developing countries.
Development and Evaluation for Improvement of a Beam-Form Support in Korean Building Constructions
Authors: Kim Jae Yeob , Choi Jong Won
Published: November 2012

This study developed the improvements to supplement problems of the existing beam-form support, which was evaluated by experts. By evaluating Improvement 3 and the existing support in the aspect of performance and construction cost, its applicability was reviewed in the field of construction work. Comparing the developed beam-form support with the existing support, thus, its constructability, safety and durability were more excellent while the construction cost was similar to each other, which means that it is possible to be applied to the field. However, it is considered that we need to have more additional researches on construction procedures that can be applied to building beam-form and development of members with economic feasibility.
Design and Implementation of Langfang Earthquake Disaster Prediction System Based on GIS
Authors: Huang Meng , Feng Ji Lin
Published: November 2012

In view of the country needs to improve earthquake disaster prevention ability of the city, this essay provided the design plan of Langfang Earthquake Disaster Prediction System(EDPS) Based on GIS. Using the GIS technology, data conversion technology and software development technology, the system established the earthquake damage prediction of spatial database and unified file data conversion interface and coordinate system, the system achieved the Langfang map visualization management and earthquake damage prediction of thematic map management system. The realization of the system provides effective technical support and improves the Langfang earthquake disaster prevention capacity.
Research on the Effect of Governor System to Low-Frequency Oscillation of Power System
Authors: Liu Zhi Jian , Zhou Shu Ming , Huang Rong
Published: November 2012

According to forced power oscillation theory, the opening of flow guide vane varies dramatically, when governor system occurs oscillation. At serious condition, prime mover’s output is affected, consequently the power system loses stability. Constructing generator and governor system modal, and then discussing the transfer function of each part, the statement indicates that dynamic characteristic can be rectified though phase compensation. as result the stability and dynamics characteristic of power system is also enhanced. Building a single-machine infinite-bus simulation model based on MATLAB, results verify the correctness of the theory analysis.
Application and Research on Reducing Reaction of Boron Slag in the Steelmaking Engineering
Authors: Zhao Ding Guo , Wang Shu Huan , Cui Xiao Jie , Zhang He Jun
Published: November 2012

Analyzed the reaction between slag and liquid iron and done a lot of experiments in the Lab to find the effect of many factors. It shown that putting into CaO to low the reaction activity with small amount of calcium oxide added, it can make the expansion in reaction to be inhibited, and improve the content of CaO in further. Silicate is high melting point material in the reaction product. After the reaction it reduce the slag fluidity to the slag with addition of CaF2, which can further improve the effect of reduction reaction.
Thermodynamic Research of Boron Oxide Reducing with Carbothermic Method
Authors: Zhao Ding Guo , Wang Shu Huan , Cui Xiao Jie , Zhang He Jun
Published: November 2012

Based on the phase diagrams analysis, the activity model of Fe-C-B ternary system was established with the ion and molecule coexistence theory. The activities of Fe, C, B, Fe3C, FeB, FeB2 and B4C in melt were calculated by analyzing the model. We have researched the thermodynamic condition of boron oxide reducing with carbothermic method and analyzed the effects of CO partial pressure, B2O3 content and slag type for the lowest smelting temperature. In normal pressure, the carbon content is high in melt, so it needs 2000°C for decarbonizing and chrome remaining. When CO partial pressure is 0.1 kPa and CaO content is less 60%, the lowest temperature of smelting ferro boron could be below 1600°C.
A SiGe RF Power Amplifier for TD-SCDMA Application
Authors: Li Wen Yuan , Zheng Sheng
Published: November 2012

A SiGe HBT power amplifier for Time Division Synchronous Code-Division Multiple-Access (TD-SCDMA) application with a single positive 3.3V supply has been demonstrated in this paper by adopting a newly proposed usage of the bonding wire. Though the emitter bonding wire may decrease the power gain, it can also decrease the effect of the knee voltage, thus increase the efficiency of the power amplifier. The post-simulation result shows that it can exhibit a linear gain of 29dB, output power of 30dBm, power-added efficiency of 38.49%, and -43dBc suppression at the second harmonic for TD-SCDMA application.
The Design and Optimization of Optic Fiber Isolation Amplifiers for EAST Quench Detection System
Authors: Zheng Long Gui , Hu Yan Lan , Lv Huan Yu , Lu Jian Hua , Pan Chao , Xiao Ye Zheng
Published: November 2012

Quench detection signals could associated with several thousands high volts to ground at some fault cases during EAST operation process .Detection system should be withstood 10 kV to ground and isolated with followed control units safety according to the design standards.Optical fiber amplifiers could be isolated high volts with control units and also eliminated noise effectively in long-distant transmission. The following optimization design had been realized to improve their electrical performance greatly .The design principles & the following optimization design of the amplifiers and related experiments results had been covered in the paper. Amplifier is the loss of the protection unit of the top class of ultra-protection, the voltage signal to the cable in a superconducting device voltage is very small, once quench 10KV high-voltage ground, if you do not take the high pressure and isolation of high-handed measures,strong high pressure will bash our class after the second compensation equipment, hardware equipment and acquisition system, power supply circuit, the amplifier performance stability, reliability and lasting protection play a crucial role in the loss of ultra-protection system, it acts as a striker's role, to play the role of ties also signal down-level transmission.
Design of Electronic Sphygmomanometer Based on Oscillography
Authors: Li Xin , Xu Jun , Duan Jin Hua , Han Leng
Published: November 2012

The appropriate blood pressure, as an important physiological parameter for reflecting the status of cardiovascular system, can maintain the normal metabolism of human body. In this paper, the electronic sphygmomanometer system based on the oscillometry adopts the MSP430 microcomputer as the core microprocessor, the pressure sensor as signal collector, LM324 as the core analog signal processing chip. The system consists of the cuff with inner air bag, baroceptor, signal processing unit, gas-charging or degassing unit and microprocessor. Controlled by the microprocessor the gas-charging or degassing unit can inflate or deflate the cuff, and the pressure signal from the pressure sensor is processed by the signal processing unit to become the blood pressure value by using oscillography. The system can reduce the number of chips and components as far as possible, featuring low cost and consumption.
Design of Frequence and Angle Measurement System Based on FFT and Monbit Receiver
Authors: Zhang Xiu Qing , An Guo Chen , Wang Xiao Jun
Published: November 2012

In this paper, a design method of high-speed, real-time digital pulse compression module based on Xilinx FPGA devices and Monbit receiver is introduced. A novel changeable-points of 256 or 1024 for three channels Digital Pulse Compression(DPC) with realizing FFT , complex-multiplication and IFFT function are presented which is accomplished by FPGA. A top-down flow has been used in the system. The whole design, which characters high stability, small logic resource occupation, low power consumption, is implemented with only one chip of FPGA XC2V500-5 for one channel. It takes 73.31us to complete a 1024-point DPC. Compared with the MATLAB simulation results, our module can accomplish function of 32k points digital pulse compression of 200MSPS throughput.
A 40Gb/s Transimpedance Amplifier Using Modified Regulated Cascode for Optical Fiber Communication
Authors: Chen Ying Mei , Wang Tao , Wang Jin Fei , Gong Jian Wei , Zhu Lei
Published: November 2012

This paper describes the design of a 40 Gb/s transimpedance amplifier (TIA) for high-density optical fiber communication system. This TIA incorporates modified regulated cascode (RGC), three order intersecting active feedback and passive feedback. Consuming a DC power of 14.5 mW, the single-ended circuit provides a transimpedance gain of 49.5 dB and a -3dB bandwidth up to 40 GHz in IBM 90-nm CMOS technology with a 1.2 V supply. Simulation results show the equivalent input noise current integrated from 1 MHz to 30 GHz is about 6.6 Arms
Preparation of PZT Material with Different Zi/Ti Ratio by Sol-Gel Method
Authors: Chen Xi
Published: November 2012

Lead zirconate titanate powders (PZT) with different Zi/Ti values 52/48, 53/47, 54/46 and 55/45 were prepared by sol-gel technique. The sol was prepared by mixing stable solutions of Zr-nitrate, Pb-acetate and Ti (OC4H9)4 precursors. The decomposition of precursors above 773 K, 923 K and 1073 K for Zi/Ti value equls to 52/48; 53/47 and 54/46; 55/45 leads to the formation of pure perovskite phase, respectively. X-ray diffraction analysis was carried out to confirm the phase formation of PZT. The relationship of synthesis temperature and Zi/Ti ratio value is disscused and it is found that higher synthesis temperature is needed to prepare pure PZT with increasing Zi/Ti ratio.
Soil Stabilizer Prepared with Saline Soil and Industrial Solid Wastes
Authors: Zhang Xu Fang , Wang Jing , Ni Wen
Published: November 2012

A soil stabilizer was prepared by mixing saline soil, slag, desulfurization gypsum and clinker. The compressive strengths of samples is up to 6.11MPa when the mixing amount of slag, desulfurization gypsum and clinker at 14% after 7 days curing. Results show that the stabilizer can meet the sub-base engineering applications, is an ideal stabilizer.
An Improved Method to Calculate the Direction and Weight in Microplane Constitutive Model
Authors: Jia Ming Xiao , Li Shu Shan , Xie Wei
Published: November 2012

This paper analyzes the calculation method on microplane direction and weight in current literature based on introducing numerical discretization algorithm in the microplane model. The characteristics and disadvantages of current methods are given out. In response to the issue that the orientation of microplane is not enough uniform and the shape and physical meaning of microplane is not clear, it is given out a kind of method that carrying out projection on the spherical surface after dividing the surface grid of regular polyhedron to calculate the orientation of microplane, then using the knowledge of spherical geometry to calculate the weight of microplane. Comparing and selecting the dividing scheme of microplane that obtained by different regular polyhedron and the grid levels, the optimization objective of fitting macroscopic elastic stiffness matrix is given out. The calculation results indicate that the method provided in this paper can obtain the dividing scheme that the shape and size of microplane are fully uniform, and the calculation result is more accurate than the optimal solution in the literature.
Bond-Slip Relation of Plain Steel Bar in Concrete with Machine-Made Sand
Authors: Zhao Shun Bo , Ding Xin Xin , Li Chang Yong
Published: November 2012

To meet the requirement of machine-made sand application in concrete structures, experimental studies were carried out on the bond of plain steel bar with Machine-made Sand Concrete (MSC) by the central pull-out test method. Three specimens were cast as one group, 14 groups were tested considering the influence of concrete strength, bond length and stone powder content in machine-made sand. Based on the experimental research, the characteristic values of bond-slip curve such as the initial-slip and ultimate bond stresses with corresponding slips are statistically analyzed, the bond-slip constitutive relations between plain steel bar and MSC were obtained.
Investigation of Corrosion of Cement-Based Materials by Using of Rotating Disc Method
Authors: Dobiáš Daniel
Published: November 2012

The paper introduces the rotating disk method, its features and the scope of application. It also describes the application of this technique in the research of corrosion of cement-based materials caused by aggressive liquid solutions and the effect of flow of solutions on the corrosion rate
Brief Analysis on Crack of Unbonded Partially Prestressed RPC Beam
Authors: Fu Qiang , Lv Bing Feng , Cao Xia , Jin Ling Zhi , Deng Ning
Published: November 2012

Reactive Powder Concrete (RPC) has excellent properties such as high toughness and high durability. In this paper, based on the experimental research of the different unbonded prestressed tendons of the unbonded partially prestressed RPC beams, the crack calculation of prestressed RPC beams is analyzed. The results show that the crack regulation is special in some extent of the unbonded partially prestressed RPC beams. It is suggested that the crack width of unbonded partially prestressed RPC beams calculated in accordance with the specification for unbounded partially prestressed concrete structure should multiply the reduction factor of 0.7.
Analysis on Load Stress of Asphalt Pavements with Different Crack States
Authors: Wang Yan , Liu Zhi Feng
Published: November 2012

Semi-rigid base asphalt pavement has well load-bearing capacity if no cracks occur. But cracks appear inevitably at the weak part of the structure. Models under different working conditions are set up with the finite element method (FEM) to analyze the stress distribution in the structure while the cement-stabilized macadam-base asphalt pavement encounters different crack states and interface conditions. The analysis indicates that the interlayer cohesion is the key factor affecting the spread of cracks. When the cohesion between the surface and base is weak, the tensile and shear stresses at the bottom of the surface course increase rapidly and both transverse cracks from the bottom to the top and longitudinal cracks in traffic direction come into being in the asphalt surface even though the base doesn’t crack; those transverse cracks which haven’t spread through the base in depth direction will reflect to the surface course under load. The reflected cracks can be reduced and stayed if the surface course is covered after the shrinking cracks in the base course have fully spread and been cured.
Research of Viscous-Spring Artificial Boundary in Dynamic Analysis
Authors: Zhang Hong Yang , Han Li Wei , Tao Zong Tao , Yao Liang , Li Song Ping , He Xiang Dong
Published: November 2012

Some dynamic artificial boundaries were summarized, including the local boundary and the global boundary. The viscous-spring artificial boundary is introduced in dynamic analysis, and the wave input method is analyzed. Finally, the precision and stability of visco-spring artificial boundary is proved by the example.
Stress Calculation of Gravity Dam Based on Elastic Mechanics
Authors: Cui Hai Bo , Zhu Hai Tang , Yue Jin Chao
Published: November 2012

Based on the elastic mechanics theory, combined with Saint-Venant principle and the superposition principle, the calculating method for the stress of gravity dam in arbitrary storage water lever were put forward by means of the equivalent stress method and the dimensional analysis method through the conversion between a Cartesian coordinate system and Polar coordinate system. The method not only offers a new idea for calculating the stress of gravity dam, but also presents research bases for evaluating synthetically the strength of gravity dam.
Dynamic Analysis of Face Rockfill Dam Based on Finite Element Theory
Authors: Zhao Yu , Cheng Sheng Zhao , Zhang Jian Wei
Published: November 2012

Concrete face rockfill dam is an important type of dam. Dynamic analysis of the dam under seismic conditions is important for researching the safety degrees of face rockfill dam under unusual conditions. This paper takes practical engineering project, Henan Tianchi pumped storage power station, as an example, makes dynamic calculation under seismic conditions, and analyzes the dynamic response of the face slab. This paper has reference meaning for face rockfill dam's design and construction.
Study on Fundamental Frequency of Runway Based on Winkler Model
Authors: Zhang Xian Min , Liang Liang , Wei Zhang
Published: November 2012

The change mechanisms of fundamental frequency of runway under different conditions are discussed in this paper. A full scale cement concrete slab finite element model is built to analyze the relationship between foundation modulus and the fundamental frequency of runway. The results show that the coupling effect of runway plates can not be neglected. The minimum area affecting the fundamental frequency of runway is 45m in longitudinal and 15m in transversal according to the analysis of fundamental frequency of different size runway. The fundamental frequency of runway ranges from 7.5Hz to 23.6 Hz when the foundation modulus increases.
System Identification Applications in Pavement Permittivity Back-Calculation
Authors: Meng Mei Li , Cai Ying Chun , Zhang Bei
Published: November 2012

The Ground Penetrating Radar (GPR) has been widely used in the road quality control of construction, maintenance management and deterioration investigation for its rapid, nondestructive and high efficient advantages. Whereas, the pavement layer thickness accuracy measured by GPR is not satisfied under any conditions, and the coring calibration must be done. Based on System Identification (SI) theory, sensitivity analysis method and the singular value decomposition of matrix technology, an inverse method is presented to back-calculate pavement permittivity and analyze layer thickness used the GPR waveform reflected by pavement structure. The experiments show the algorithm is faster, more stable and more accurate in thickness calculation. When it is used in GPR data analysis, the traditional coring calibration will be reduced or avoided.
Research on the Relationship between Effective Porosity and Ratio of Cement to Stone of Non-Sand Concrete Well Pipe
Authors: Yan Chao Jun
Published: November 2012

Non-sand concrete well pipe is widely used in dewatering construction of deep foundation pit, the running effect of water-filtration well pipe have a close relationship with casting-pipe porosity, material ratio and casting-pipe time. With a long term test, the indicators' critical values of casting-pipe based on maximum porosity is proposed, which is under a condition of ensuring the adequate strength of non-sand pipe and different proportion of limestone cement and stones. The critical values have a great significance to improving non-sand pipe effective porosity, reducing permeation resistance and increasing infiltration capacity, and also can provide a reference for the design and constriction of similar projects.
Rural Drinking Water Security Evaluation and Simulation Based on MATLAB Digital and Vector Processing Technology
Authors: Pan Hong Wei , Xi Bei Dou , Lei Hong Jun , Wei Zi Min , He Xiao Song , Jiang Yong Hai
Published: November 2012

MATLAB software is widely used in scientific computation and simulation area, and has also been increasingly used in the water science and related fields. In this paper, the FUZZY-AHP toolbox was developed based on MATLAB digital and Image processing technology. As an example the rural drinking water safety assessment was tested by the use of FUZZY-AHP toolbox. This study could also provide some new ideas for rapid assessment in drinking water safety & other related issues and a visualization method for evaluation results exhibition.
Experimental Study of Ultrafiltration of Eutrophicated Source Water in Combination with Sand Filter and Biological Contact Oxidation
Authors: Li Fa Zhan , Cheng Dong , Lv Xi Wu
Published: November 2012

The experiments of ultrafiltration of Taihu Lake water with sand filter and water- dropping aeration biological contact oxidation combinations were evaluated. The experiment results showed that under the conditions of the average water temperature was 19.8°C and the HRT of the biological contact oxidation was 1.5h, the removal rates of turbidity, ammonia nitrogen, CODMn and algae by technological purification process were 99.1%, 85.2%, 53.6% and 98.7% respectively. As a comparison, the removal rates of turbidity, ammonia nitrogen, CODMn, algae, UV254 by routine purification process respectively were 96.6%, 16.3%, 35.8% and 95.5% separately in Wuxi Chongshan waterworks at the same water temperature. Under the conditions of approximately equivalent in investment and running expenditure by technological and economical analyses, the efficiency of technological purification process was higher than that of routine purification process.
Study on Reasonable Feature of Compaction Loess with Air Porosities
Authors: Yang Jing , Wang Ling Hao , Ma Fu Li , Bai Xiao Hong
Published: November 2012

The degree of compaction is usually used as the compaction quality and control indicator of backfill in practical project. However, as the degree of compaction is affected by various internal and external factors, its accuracy is difficult to guarantee. In this paper, compacted loess samples were prepared under different compaction energies by normal compaction method. The curves of compression coefficient and dry density, the compression coefficient and porosity of compaction loess samples under different compaction energy are analyzed while the water content is constant. The air porosities of compaction loess samples under different compaction energy and water content are calculated and summed up. The air porosity of compaction loess samples under different compaction energy is more stable than the degree of compaction when the water content is exactly equal to the optimum water content. The rationality of using air porosity as the loess compaction quality control indicator is discussed. It is proposed using air porosity as additional indicator of compaction quality control on the condition of the loess compacted dry density meeting the requirements. The air porosity less than 6.5% is suggested as the additional quality control indictor for region backfill compaction.
Research of Highway Alignment Design Safety Evaluation Using Curvature Change Rate
Authors: Hu Sheng Neng
Published: November 2012

Aiming at the disadvantages of traditional design method of highway alignment and existent problems including subjectivity, reliability index, comprehensive, applicability etcetera in highway alignment evaluation with running speed. On the basis of the “safety first” idea for highway design, the concept of change rate of curvature has been proposed. Curvature change rate is the clear factor impacting on road traffic safety. Road quality evaluation standard is established based on the curvature change rate and its application method in highway alignment design method. The method not only effectively evaluates highway alignment quality, but also may be used as the basis for the selection index of highway geometric design.
Compensation Design of Highway Landscape
Authors: Hu Sheng Neng , Fan Qin Dong , Hu Zhong Huang , Xiao Xin Hua
Published: November 2012

By summarizing the landscape design situation at present in China and overseas, this paper analyzes the problems and defects existed in the Chinese highway landscape design. The compensation design method of highway landscape is put forward, which contains the road side slop, the central dividing strip, the intercommunication grade separation and the service area.
Some Points about the Local Living Environment Research
Authors: Li Hong Guang , Liu Yu Qing , Ding Yi
Published: November 2012

By the analysis of the direction and situation of traditional inhabited region and the local living environment research, this paper points out that the weakness and shortage of extent and effects had been quite serious. Some advices are given out to rediscover researching ranges, targets and methods, and make alive develop traditional culture of architecture
Planning and Design of Urban Barrier Free Building Environment with Aging of Population
Authors: Song Ling , Zhang Shao Wei , Li Zhi Min
Published: November 2012

With the development of the times, the quality of human life and environment gets ameliorative ceaselessly. It is the main goal for ensuring every public safety, health, comfort and convenience of modern society civilization and city construction, and "concern for people" is the most basic principles. On the basis of helping the different application groups, such as different age, different view of life and physical condition to set up independent life, this paper proposes the ideas and methods for planning and design humane architecture and city environment with complete and perfect building facilities.
A Tentative Research on Site Selection of Shanxi Buddhism Temple Architecture
Authors: Li Yuan Xin , Zhu Xiang Dong , Wang Chong En
Published: November 2012

Buddhist architecture which was introduced to China from India had become an important component of traditional Chinese architecture, and the characteristics of different regions had formed after the long-term development. This article starts from Shanxi’s location environment, analyzes the considerations of geographical environment of Shanxi temple construction’s site selection and the historical regularity of their distributioncombining with the site selection factors of traditional Chinese architecture. Thus, the general rules of site selection of Shanxi temples and its particularity of distribution are revealed preliminarily from the viewpoint of space and time.
Toughness of ECC Evaluated by Nominal Fracture Energy
Authors: Gao Shu Ling , Shao Wei , Qiao Jin Li , Wang Ling
Published: November 2012

ECC (Engineered Cementitious Composites) has ultra-high toughness and can be used in the zone needing the ultra-high tensile strain and very high durability. In order to investigate the toughness of ECC, the normal fracture energy GF is calculated and compared with ordinary concrete. The influence of the matrix (fly ash, silicon fume), the fiber (glass fiber, steel fiber and PVA fiber) and the fiber volume ratio on the GF of ECC are analyzed. The research indicates that silicon fume and glass fiber, steel fiber are all not able to be used in ECC. But flash ash and PVA fiber are very suit for using in ECC, the toughness of ECC increases with the increase of their content.
Development and Application of the Virtual Simulation Teaching System of Steel Structure Construction
Authors: Tang Zhong Ping , Xu Yong Chun
Published: November 2012

This paper introduces the concept and application of virtual simulation technique, faced to the problems in teaching steel structure construction, develops the virtual simulation teaching system of steel structure construction with virtual simulation technique and 3D production technique. After that, it introduces the software’s system structure, content structure, interface design and application in teaching. The development of this system, not only change the traditional teaching model and studying style, but also promote the teaching efficient, save the teaching time and costs.
Application of Improved Response Surface Method Based on Kriging Model to Structural Reliability Analysis
Authors: Jia Bu Yu , Yan Quan Sheng , Yu Xiao Lin
Published: November 2012

The paper aims to do the reliability analysis by the Kriging model. Its excellent approximating capability is taken into consideration, which is superior to traditional response surface method. An improved response surface method has been proposed based on the Kriging model. The seismic response of structure is characterized by nonlinear and complexity, more difficulties in the reliability analysis have been found as well. Compared to other methods of reliability analysis, the response surface method is regarded as an effective way to solve such problems. Thus the improved response surface method based on the Kriging is utilized to analyze the structural first excursion dynamic reliability problem under random seismic excitation. Meanwhile, the influence on the reliability due to the randomness of structural parameters is analyzed.
Free Vibration Analysis of Frame-Core Tube Structures Attached with Damped Outriggers
Authors: Wang Zhi Hao
Published: November 2012

The classical outrigger in frame-core tube structure cantilevering from the core tube or shear wall connected to the perimeter columns directly, which can effectively improve the lateral stiffness of the structure. A new energy-dissipation system for such structural system is studied, where the outrigger and perimeter columns are separate and vertical viscous dampers are equipped between the outrigger and perimeter columns to make full use of the relative big displacement of two components. The effectiveness of proposed system is evaluated by means of the modal damping ratio based on the proposed simplified model. The mathematic models of the structural system are obtained with both the assumed mode shape method and finite element method according to the simplified calculation diagram. Based on the modal damping ratio, the optimal damping coefficients of linear viscous dampers are determined, and effectiveness of proposed system is confirmed.
Checking Computation for Bracket Structure of Jinqinggang Bridge
Authors: Liu Shi Ming , Zhao Hui , Yang Zu Lin
Published: November 2012

In order to ensure the safety of bracket structure during the cast-in-place construction of No.0 and No.1 piece concretes, this paper makes use of probabilistic limit state method to do the checking computation. According to the design drawings of bracket structure of the Jinqinggang bridge and the actual load case, the analytical model is founded by the finite element analysis software MIDAS/CIVIL. The results show that the stresses of all parts of the bracket structure including the concrete local compressive stress and the tensile stress of embedded steel bar are less than the allowed value of corresponding materials, but the deformation of the steel moulding plate is larger than standard allowance value. The weld joint between upper chord and slanting pole with embedded steel plate satisfies the design requirement.
Full-Scale Model Test for Anchorage Zone of Pylon of Cable-Stayed Bridge
Authors: Yu Xiao Lin , Jia Bu Yu , Wang Wei Feng , Yan Quan Sheng
Published: November 2012

In this paper, the construction technology for main pylon of cable-stayed bridge is researched through test of full-scale model of anchorage zone of pylon of Guangzhou Bridge. Stress distribution and deformation condition of model under prestressed tendons and cable force are analyzed. Numerical simulation on this anchorage zone model is carried out. By comparing FEM results to the test results, some important conclusions are drawn out and give some advices to the optimum design of the bridge pylon. Parts of the achievements have been applied to actual bridge work and obtained successful engineering experience.
Mechanical Behaviors and Chloride Permeability of Rice Husk Ash Concrete
Authors: Wang Hai Long , Peng Qi Wen , Sun Xiao Yan
Published: November 2012

Rice husk ash (RHA) was used as a mineral additive in concrete and replaced the ordinary cement by 0-30% in this study. The fresh concrete properties, compressive strength, split tensile strength, and elastic modulus as well as the chloride permeability of concretes mixed with different RHA contents was tested. The experimental results reveal that the fluidity, the mechanical behaviors and the chloride ion resistance of rice husk ash concrete decrease with the increasing replacement rate of RHA. The particle size of RHA limits its pozzolanic activity, which indicates that the controlled burning temperature and the fineness of RHA have significant impact on the properties of rice husk ash concrete.