bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Durability of Recycled Concrete under the Environment of the Acid Rain
Authors: Zha Xiao Xiong , Lu Jun Kai
Published: August 2011

Due to the rough surface of the recycled concrete aggregates, low modulus of elasticity and large porosity, these properties led to that the apparent density, strength, physical properties and durability of the recycled concrete made by recycled aggregates are different from the Portland cement concrete, so that the standards and requirements formed about the Portland cement concrete are not entirely suitable for the recycled concrete. On the basis of the experimental studies, this paper analyzes the differences of mass loss, crushing strength and neutralization depth between the ordinary Portland concrete and recycled concrete under the influence of simulation acid rain. The results showed that there are different degrees of change between the concrete with 100% aggregates instead of recycled aggregates and the Portland concrete in mass loss, crushing strength and neutralization depth under the influence of simulation acid rain.
Experimental Study on Seismic Behavior of Pre-Cast Concrete Structure with Cast-In Situ Integral Beam-Column Joint Sub-Assemblage
Authors: Zhang Ji Chao , Li Nan , Ji Lei
Published: August 2011

Based on the need of housing industrialization, using full-scale models, this paper investigated the seismic behavior of pre-cast concrete beam-column subassemblies with cast-in-situ monolithic joints under low-cycle reversed loading. The failure pattern, hysteretic characteristic, skeleton curve, ductility and energy dissipation were also analyzed. The result indicated that beam-column joints with longitudinal bars welded at the bottom of beams can meet the requirements of “strong column-weak beam, stronger joint”.
Study on Geology Model of Ge-He-Yan's Back Rock Mass Slope
Authors: Liu Jie , Luo Shi Wei , Wan Liang Peng , Zhu Min
Published: August 2011

According to the research of geology condition in Ge-he-yan's back rock mass slope,set up the homologous engineering geology model, carried on parts of qualitative analysises, combined with numerical analysis method based on the unloading rock mass theory, gave the quantitative analysis of the engineering geology model, then got the special deformation mechanism of this slope.
Analysis Coupling Vibration Characteristic of HVAS Droplets Based on Wave-Like Disturbance
Authors: Chen Bin , Liu Ge , Zhang Xian Ming , Huang Lang
Published: August 2011

Characteristics of vibration molten metal droplets are decisive importance to performance of high velocity arc sprayed coating, it is hardly that detected the dynamic action of liquid droplets owing to the limitation of experimental technique. The gas fluid-liquid droplet coupling vibration system of equations were established based on wave-like disturbance, the governing equation for fastest-growing wave number is derived. The agreement of predicted fastest-growing wave number and data of Bradley, which has the deviation within the±2% limits,indicares that the gas fluid-liquid droplet coupling vibration system of equations is effective. By the use of the coupling vibration system of equations, the effects of gas velocity, gas type and molten metal type to vibration characteristics of HVAS droplets is researched. The results show that selected N2gas sprayed and increasing the gas velocity would be raise adhesive strength of the spraying coating, and provides theoretical evidence for choice of spraying materials and control in HVAS.
Research on Ergonomic Evaluation of Interior Design of ATC Cab
Authors: Yu Shu Lan , Chen Liu
Published: August 2011

The rationality of spatial environment design and operational parts’ layout design in ATC (All Terrain Crane) cab needs to provide a quantitative basis through objective evaluation and analysis. In this paper, 3-D space model of ATC cab is constructed in accordance with data provided by a new type of ATC in a famous domestic crane enterprise, and the Chinese human database is established based on Human Dimensions of Chinese Adults(GB10000-88). Besides, the interior design ergonomic evaluation system of ATC cab is created by customizing specific toolbars and dialog boxes with VB language secondary development on CATIA software platform. This system can evaluate comfortable areas and reaching scopes of joystick, seat, pedal, steering wheel and other operating devices and give the evaluation conclusions. This provides a feasible and effective design evaluation method for computer-aided interior design of ATC cab.
Calculation Method of Flexural Bearing Capacity of Carbon Fiber Reinforced Concrete Beam
Authors: Zhou Le , Liu Hong Tao
Published: August 2011

To study further mechanical behavior of flexural members of carbon fiber reinforced concrete, this text uses the methods of fiber materials composite principles and balance equations, and derives the elastic modulus of the carbon fiber concrete. The acting principle of carbon fiber in the concrete is analyzed. Based on three bearing stages of carbon fiber reinforced concrete beam, the calculation formulas to flexural bearing capacity of carbon fiber reinforced concrete are given. It is theoretical basis of implication of carbon fibers in civil engineering.
Study on Fresh Air Demand of a Long Highway Tunnel
Authors: Ding Chao , Zhang Xu
Published: August 2011

On the basis of a long highway tunnel, this paper has worked out different fresh air demands in tunnel under various conditions—different driving speed; renewal of vehicles; different combination of motor vehicle emission standards; emission of NOx considered or not considered. From three aspects (calculation methodology, exhaust emission, design concentrations of pollutants) this paper has made a comparative analysis between the results calculated according to JTJ026.1-1999 and PIARC2007. The research findings show that there still exists a huge gap between JTJ026.1-1999 and PIARC2007. Domestic specifications should be adjusted and improved in terms of exhaust emissions and design concentrations of pollutants, so as to achieve the purpose of determining reasonable fresh air demand.
Installation Technology of Mega Complex Steel Frame Structure in Guangdong Science Center
Authors: Zhang Ji Chao , Zhou Guan Gen , Ma Xu , Min Shan
Published: August 2011

Based on the installation process of mega complex steel frame structure in Guangdong Science Center, the engineering features and difficulties are introduced. Then the installation schemes and technologies are described in detail, including installation stages division, installation sequences, installation technology of steel column, main or secondary truss and bow truss. The result indicates that the effect of the installation technology is perfect. The application of this installation technology effectively ensures construction progress, quality and safety.
Application of Plants of Adaptability to Karst in Green Building
Authors: Wu Yan You , Zhao Hong Peng , Zhu Yong Li , Zhao Kuan
Published: August 2011

Concrete is the most common material used in buildings and its performance is improving. The plant-growing concrete was developed for conveniently greening. The plant species to able to grow in the plant-growing concrete was few. The habitat of plants grown in the plant-growing concrete is very similar to Karst soil environment. The plants of adaptability to Karst were adapted to the Karst stresses of high calcium and pH, low nutrition and drought. The plant-growing concrete combined with the plants of adaptability to Karst can apply in ecological slope protection, roads and roofs greening, and vertical greening. The vertical greening by the plant-growing concrete combined with the plants of adaptability to Karst will enlarge the green areas, beautify the cities and increasing landscape diversity.
Study on the Decorative Art of Huizhou Ancient Folk Houses
Authors: Zhang Quan , Chen Gang , Zhang Xiao Rui
Published: August 2011

Architecture is a carrier of culture, as well as a product of one certain historical period. Influenced by the traditional culture over a long period of time, Huizhou folk houses have formed their own decorative design style with unique regional features. The article explores the design ideas on the decorative art of Huizhou ancient folk houses through formation and development of the decorative style, decorative characteristics, adornment subjects and decorative crafts. Based on it, the article excavates modern significance and value of the decorative art of Huizhou ancient folk houses, trying to get some references and enlightenments on modern architectural decorative design.
An Air Conditioning Energy Optimization Control System for a Telecom Building
Authors: Yan Jun Wei , Gao Zhi Ming , Xu Hai Hang , Zhong Lei
Published: August 2011

According to the problems of the existing air conditioning system of the telecom building, a new air conditioning energy optimization control system was designed and constructed. In this system, a refined control that covers from the cold source to the air conditioning terminal units can be achieved. The system worked efficiently by applying various control technologies. It is reliable and easy to operate. Significant energy savings has been achieved since its application in 2010.
Influencing Factors of Partnership Formation in Construction Industry
Authors: Pei Xu Dong
Published: August 2011

The influencing factors of partnership formation in construction industry are studied using a meta-analysis. The results show that trust, commitment, interdependence, joint problem solving, information sharing, conflict resolution and joint action are positively associated with partnership formation in construction industry.
Spatial Change of Salinity at Kuroshio in East China Sea with Seasons
Authors: Li Yan , Kang Jian Cheng , Liu Chao
Published: August 2011

Kuroshio influences hydrological-climate environment of East China Sea by exchanging heat and salinity. It has great influence on climate-environment in East China. Understanding of seasonal variability of salinity at Kuroshio in the East China Sea (ECS Kuroshio) can provide a scientific basis to reveal the climate-environment change in East China. In this paper, Using salinity database of World Ocean Atlas 2009(WOA09) issued by NOAA in 2010, the change of salinity distribution and the high-salt areas at ECS Kuroshio with seasons have been analyzed, the results show that: upper low-salinity water between 0~125m is obviously changing with seasons. From spring to winter, the horizontal stratification at upper low-salinity water first increases and then decreases, but the phenomenon of vertical mixing is opposite with the horizontal stratification. The horizontal stratification is the most obvious in summer, it forms 0.33/m of halocline strength above 10m; the vertical mixing is the strongest in winter, upper low-salinity water mixes with higher-salinity water in Okinawa trough, and salinity is homogenous in vertical above 250m. There are seasonal variations of depth and range of the high-salt areas in different segments along ECS Kuroshio, and there are three high salinity cores in the high-salt areas: two of the high salinity cores appear in the sea area east of Taiwan in autumn and winter, the third core appears in the sea area northwest of Miyako-jima in spring.
Study on the Application of Lightweight Aggregate Ceramsite Concrete in Building
Authors: Nie Lu , Zhang Yuan
Published: August 2011

This article mainly narrated the ceramsite concrete thick aggregate, the performance and the application situation. Domestic and foreign has conducted a series of research to ceramsite concrete's application, in applies and in the promotion, compares with the developed country, our country also has certain disparity.
A Study of HOPSCA Development under the Intensive Land Use
Authors: Hu Mo Zhong , Fan Yan Hua , Zhao Qiu Quan
Published: August 2011

The emergence of urban complex is a necessity of the generally accepted concepts--moderate concentration of the city, compact development of space and organic mixture of function. It explains the nature of city development on the level of "Urbanism, Openness and Intensivism”, and it is an urban entity combining the internal logic dynamically between city function and city development by city architecture and city space. In the real HOPSCA time, what we concern is the city rather than the architecture.
F²TE³: a Transparent Semi-Monocoque VIP Envelope
Authors: Alonso L. , Bedoya C. , Lauret B. , Alonso F.
Published: August 2011

This article examines a new lightweight, slim, high energy efficient, light-transmitting, self-supporting envelope system, providing for seamless, free-form designs for use in architectural projects. The system exploits vacuum insulation panel technology. The research was based on envelope components already existing on the market and patents and prototypes built by independent laboratories, especially components implemented with silica gel insulation, as this is the most effective transparent thermal insulation there is today. The tests run on these materials revealed that there is not one that has all the features required of the new envelope model, although some do have properties that could be exploited to generate this envelope, namely, the vacuum chamber of vacuum insulation panels, the use of monolithic aerogel as insulation in some prototypes, and reinforced polyester barriers. These three design components have been combined and tested to design a new, variable geometry, energy-saving envelope system that also solves many of the problems that other studies ascribe to the use of vacuum insulation panels.
Vacuum Insulation Panel for Green Building
Authors: Chen Zhou , Chen Zhao Feng , Qiu Jin Lian , Xu Teng Zhou , Zhou Jie Ming
Published: August 2011

Vacuum insulation panel is regarded as one of the most promising high performance thermal insulation materials for green building. It has extremely low thermal conductivity and its insulation performance is a factor of four to eight times better than that of conventional insulation such as mineral wool or polymer foams. The high thermal resistivity of VIP provides new solutions for slim but still energy efficient building envelopes. Although VIP has widely been used in refrigerators and freezers for a long time, it has only recently been discovered by the building sector. There is not yet any alternative for conventional thermal insulation materials in many countries, especially in China. This paper attempts to investigate the components, features and advantages of VIP for building, it will be helpful to the development of green building.
Passive Solar House Design Strategy in the North-East of China
Authors: Wang Xue Ying , Wu Ya Jun , Xu Dong
Published: August 2011

Proceed with basic passive solar construction parts,analysis and state thermal storage,heating accumulation and consumption process of passive solar energy.Put forward several effective measures to strengthen thermal storage and heating accumulation and reduce thermal loss in the northeast area.Lay the foundation for the green house design in the north-east of China.
Kinetic Building Envelopes for Energy Efficiency: Modeling and Products
Authors: Miao Zhan Tang , Li Jing , Wang Jia Liang
Published: August 2011

Adaptive Building Envelope was discussed in recent years and became a possible solution for energy efficiency. We conducted a study of kinetic building envelopes for energy efficiency in the context of an interdisciplinary design & modeling course in 2010 Fall. The goals of these experimental design & modeling projects are to explore the possibilities of motion modes, the integration with whole envelopes and the potentials of applications, and to provide insight into sustainable design. This paper provides an experimental account of kinetic logics and products, and summarizes kinetic motion patterns and potential applications.
Seismic Strengthening on Masonry Structure of Primary and Secondary School Buildings
Authors: Zhou Xue Feng , Chen Xiang
Published: August 2011

It is an important issue for engineers and technicians that how to conduct safe identification and earthquake resistant strengthening of the primary and secondary school buildings after Wenchuan earthquake. The paper comprehensively reviewed aspects of quality detection, safety identification and strengthening design of the primary and secondary school buildings in Xi’an district. To address existed security risks, construction progress, construction complexity and period were comprehensively considered to choose corresponding seismic strengthening method based on seismic qualification and site survey. Project proposal was given according to problems in the design, which provides reference to design and construction of following similar projects.
Research of Preparation and Characterization of PP/EPDM/CaS Composites
Authors: Zhao Ming , Lu Xiao Zhong , Gu Kai , Sun Xiao Min , Ji Chang Qing
Published: August 2011

A series of polypropylene/ethylene-propylene-diene monomer / calcium silicate (PP/EPDM/CaS) composites with different contents was prepared by melt processing using a twin-screw extruder. The composites were characterized. The results showed the particle shape of calcium silicate is honeycomb structure . The heat deflection temperature of PP/EPDM/CaS composite increased with increasing CaS content. The composites had highest tensile strength and the lowest when CaS content was 9.5 phr and 35 phr respectively.
Circuit Fault Diagnosis Interface Software Design
Authors: Fan Tong Shun , Wang Yu Ping , Luo Li Ming
Published: August 2011

On the basis of research on digital circuit fault diagnosis system for missile launch and control system – one research project recently completed by the author ,and through analysis for the first and foremost problem of interface circuit, this paper makes a detailed description of digital circuit fault diagnosis interface circuit software design based on LabWindows/CVI, and gives major steps of the development for interface circuit software.
Interior Proliferation and its Improvement of Hydrogen Sulfide from Hot Springs Gas
Authors: Huang Chih Hong , Pei Sen Chi
Published: August 2011

For a healthy environment for hot spring recreation, this study discussed the diffusion in the bathroom of hydrogen sulfide gas from hot sulfur springs for an improvement of this harmful situation. Based on empirical measurements and then comparing the results with CFD simulation, the analysis exposed the distribution status of indoor hydrogen sulfide and its diffusion behavior. Results indicate that sulfur springs produce high levels of hydrogen sulfide that are hazardous. And the high concentrations can be improved under ideal ventilation, which was determined by the air exchange rate, flow field efficiency, turbulence and vortex phenomena.
Acid Leaching Aluminum from Boiler Slag - Effect of Fluoride Additives on the Aluminum Dissolution
Authors: Li Jin Ping , Gan Jin Hua , Chen Ying Ming
Published: August 2011

The objectives of this work are to study the influence of fluoride additives on aluminum recycling from the boiler slag. The effect of adding different amounts of fluoride, such as NaF, NH4F, KF and CaF2, was investigated. An elemental analysis of aqueous solutions leached by sulfuric acid and hydrochloric acid was determined by EDTA-Na2-ZnCl2 titration method. The components and microstructures of the samples were examined by means of XRF, XRD and SEM. Acid strength, leaching time, solid/liquid ratios and different additives were conducted in this experiment. The fluoride additives have a significant effect on the leachability of alumina in the boiler slag. NH4F is the best choice economically because of low dosage and high efficiency.
Flexural Behaviour of Reinforced Concrete Members Subjected to Freeze-Thaw Cycles
Authors: Duan An , Jin Wei Liang
Published: August 2011

The purpose of this research is to investigate the influence of the freeze-thaw cycles on the flexural behavior of reinforced concrete members. The variation of the concrete stress-strain relationship due to frozen-thawed deterioration was considered. The temperature distribution was calculated based on the heat conduction theory, and the damaged region affected by freeze-thaw cycles was determined. By using Reponse-2000 program, the flexural behaviour of a reinforced concrete slab was analyzed and predicted. The analytical results show that with increase of number of freeze-thaw cycles, the yield moment, the ultimate moment and the curvature ductility decreased, while the relative depth of neutral axis and the midspan deflection increased.
Damage and Chloride Penetration of Cement Mortar under Conventional Triaxial Compression
Authors: Jin Zu Quan , Li Qiu Yi , Li Chuan , Zhao Tie Jun
Published: August 2011

In this paper, the influence of conventional triaxial compression on damage and chloride ion penetration of cement mortar are investigated. Conventional triaxial compression experiment was carried out with confining loading of 10Mpa. And the stress-strain curve was measured when axial stress was 50%, 80% and 100% of peak axial loading, and 80% axial loading post-maximum. Then the damaged cement mortars was stored in Qingdao sea water for 30 days, and the free chloride content as well as chloride diffusion coefficient of damaged mortars were quantitatively determined. The experimental results show that the cement mortar is compacted in the end, and shear damaged in the middle under conventional triaxial compression. Compared to cement mortar under uniaxial compression, its compressive strength and axial deformation increases by 1.94 times and 5.6 times when cement mortar under conventional triaxial compression. When the axial stress is less than 48% of peak axial loading, and the axial deformation is less than 0.63mm, the mortar is compacted and its relative dynamic elastic modulus increases with raising axial loading and deformation. The free chloride content in the pressure-bearing side is higher than that in the bottom side. And the free chloride content in the interior of mortar increases with raising axial loading. The chloride diffusion coefficient and axial loading are related in quadratic function. When the axial deformation of mortar is higher than 0.72mm and 1.57mm, the chloride diffusion coefficient of non-load mortar, is less than that of loaded mortar in the pressure-bearing side, and in the bottom side, respectively.
SHPB Test on Dynamical Mechanical Behavior of Concrete with High Temperature
Authors: Jia Bin , Li Zheng Liang , Yao Hua Chuan , Tao Jun Lin
Published: August 2011

An experimental system is designed by combining the split Hopkinson pressure bar (SHPB) with microwave heating device, based on stress wave theory, availability of the experiment technique is analyzed. Tests of concrete whose temperature changes from room temperature to 650°C and impact velocity from 5m/s to 12m/s are completed and for the first time high-temperature dynamical damaging phenomena of concrete are obtained. Based on data analysis, the dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect whose influence keeps on decreasing with temperature increasing, but also the high temperature weakening effect. And the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence.
Study on Stress and Deformation Performances of the Spliced Cement Formwork Reinforced by FRP
Authors: Song Xiao Ruan , Zhang Xiao Yun , Dai Wei , Qu Yu Ting , Xu Zi Liang
Published: August 2011

For permanent cement-base formwork, due to stay-in-place with concrete during all the service life and minor size of the end surface, the splicing methods of traditional formworks are not adapted to be used. In allusion to natures of the cement-base formwork, this paper presents ten types of splicing methods. For each method, a group of specimens are prepared and whose capacity and deformation performance are investigated. And meanwhile, stress and deformability of the full specimens without joint are researched under the same conditions. Through above splicing experiments, some reliable splicing method is obtained. The experimental results provided by this paper present a gist for investigation and application of the permanent cement-base formwork.
Comprehensive Assessment of Green Degree of Building Material Using Fuzzy AHP
Authors: Yi Cheng , Shi Jing , Zhao Xiao Long , Zhao Wen Hai , Liu Qiang , Liu Hui Xin
Published: August 2011

As pointed out in this paper that, for a common building material, it is relatively difficult to judge its green degree in comparison with that for a special function material because the judgment factors are comprehensive. The relevant factors which affect the greenness index such as physic expenditure, pollution, economic are analyzed and all influential factors are discussed. For the common building materials, their different inter-restrain factors are divided in administrative level and the weight of factors is determined according to the AHP theory. Meanwhile, the assessment scale and criteria for the factors, and the grading standard for the material green degrees are given in the paper. Based on the fuzzy comprehensive evaluation theory, a green degree evaluation model is established. Finally, the reasonability of the model is testified with the instances introduced in the paper.
A Study on Traditional Craftsmanship of Wuxi Dayao Bricks and Tiles
Authors: Zhu Yun Feng
Published: August 2011

Wuxi Dayao bricks and tiles are famous for their elegant form and durable quality, but they have gradually withdrawn from historical stage because of lack of innovation of modern technology. They are the crystallization of ancient peoples’ wisdom in transforming nature and improving their living qualities with over six hundred years’ traditional craftsmanship, and have profound significance for prolonging Chinese traditional architectural culture and improving existing building materials. Therefore, it is necessary to carry out researches and inheritance.
Research the Traditional Building Materials in Restoration of Huishan Ancient Town
Authors: Zhu Yun Feng
Published: August 2011

Huishan Ancient Town is a key heritage conservation unit in China which has the rare ancient shrine buildings. Currently, the Wuxi government has started the restoration project in Huishan Ancient Town which used a large number of traditional building materials. The purpose of this report is to research and analyze the use of these traditional building materials, which provide a valuable reference for other ancient buildings repair in the future.
Predictive Analysis of Demand for Chinese Industrial Design Industry
Authors: Zhu Yun Feng
Published: August 2011

Industrial design education has a big scale in China, which cultivates a large number of talents who have made a mass of contribution to enhance Chinese industrial competitive power. Currently, the domestic industrial design education is undergoing a transformation from quantity to quality, thus, it is necessary to do predictive analysis of demand for industrial design industry.
Study on Properties and Pavement Performance of Anti-Flaming and Warm-Mix Asphalt
Authors: He Zhao Yi , Huang Yang Cheng , Huang Gang
Published: August 2011

In order to solve the problems of environmental contamination, large resource consuming and inflammability of asphalt mixture, this research chooses warm-mix agent and fire retardant to double modify the asphalt. After obtain the method to produce the anti-flaming and warm-mix asphalt through orthogonal experiment, its road property and anti-flaming property are valued. According to the experiment result, under the condition of cooling down 30°C of the mix temperature, the modified anti-flaming and warm-mix asphalt can increase the high temperature property of the asphalt mixture, but decrease the low temperature property and water stability characteristic of it. This asphalt has excellent anti-flaming characteristic, so it can decrease the property loss after being burnt.
Effect of Added-Calcium Thermal Activated Coal Gangue on Cement Hydration
Authors: Song Xu Yan , Han Jing Yun , Gao Zhi Hai
Published: August 2011

Through determining Ca(OH)2content and chemically combined water content, hydration degree of cement with added-calcium thermal activated coal gangue may be analyzed. Variation of mineral composition during hydration process of system was analyzed by X-ray diffraction(XRD) method. Simultaneously, specific strength index was applied to study pozzolanic effect of activated coal gangue. The results can show high contribution of added-calcium coal gangue calcined at 1050°C for pozzolanic properties and high hydration reaction degree in this kind of activared coal gangue cement system, with fewer Ca(OH)2content, more chemically combined water content and obviously reduced hydration product Ca(OH)2at each age.
Study on the Influence of Cooling Rate on the Property of Non-Quenching and Non-Tempering Steel OCTG
Authors: Fang Jian , Li Yang Hua , Xie Kai Yi , Zou Xi Yang , Zhou Meng Xiong , Yuan Ze Xi
Published: August 2011

Two industrial produced non-quenching and non-tempering steels 40Mn2V and 36Mn2V had been tested by Gleeble-1500 thermal simulation machine to simulate MPM rolling, sizing and cooling process. The cooling rate in the air noticeably affected the final property of different size pipes. According to the measured practical cooling rates of different size pipes, appropriate size pipes with cooling rate at range of 0.9°C/s~1.6°C/s and 1.6 °C/s~2.1°C/s can be picked out to use steel 40Mn2V and 36Mn2V to produce grade N80 OCTG(Oil Country Tubular Goods) with steady property respectively. This result had been used in practical production, which greatly improved the property stability of grade N80 OCTG.
Calculation of Load-Carrying Capacity of Square Concrete Filled Tube Columns Based on Neural Network
Authors: Gao Hua Guo
Published: August 2011

Concrete filled steel tubes of square columns under axial load are in complicated stress, the influence of every factor on mechanics performance is difficult to ascertain accurately. Neural network performs well obtaining the relationship between input and output variables by self-studying, self-organizing, self-adapting and nonlinear mapping. In this paper a three-layer back-propagation model of network is successfully trained and set up according to experimental data of square CFT columns under load. Ten groups of experimental data were verified by the model, the results show the predicted values are in accord with test values, precision in calculation is good enough for structure design. So the neural network model can be used as an auxiliary method to calculate the capacity of square concrete filled tube columns in the project. With the increase of experimental data, the neural network precision of prediction will be improved in the future.
Low-Carbon Communities and Eco-Building Planning and Design Strategies and Practices in MianYang City,China Science-Technology City
Authors: Nie Kang Cai , Shi Bin , Pan Le
Published: August 2011

The concept of low-carbon city, low-carbon communities is increasingly well known, the relevant theory of low-carbon, low carbon planning studies have also appeared. The text starting from the concept and characteristic of low-carbon communities, based on the case of low-carbon community in Mianyang City, China science-technology, in terms of community, from planning perspective, has a practice attempt on content and strategy of low-carbon planning and design.
Design and Analysis of Section-III Cable Net Curtain Wall of Hefei Xinqiao International Airport Terminal
Authors: Ding Da Yi , Shu Chang , Gao Yang , Wang Yuan Qing , Pei Da Peng , Tang Yan
Published: August 2011

Section-Ⅲ landside curtain wall of Hefei Xinqiao International Airport terminal adopted single layer cable net curtain wall, while others adopted stick-system curtain wall structure. In this paper, the section-Ⅲ overall structure model of Hefei Xinqiao International Airport terminal was established by using the finite element method (FEM) software ANSYS. The load bearing capacity and deformability of landside curtain wall under load cases with seismic loads and wind loads were analyzed. Also the cable net curtain wall’s effect on the main structure was discussed. The results showed that the displacements of curtain wall and the internal forces of cables met the requirements, and the cable net curtain wall had little effect on the main steel structure.
Species Distribution of Heavy Metals in Enhanced Electrokinetic Removal Process
Authors: Xu Zhong Hui , Li Dong Wei , Peng Xi
Published: August 2011

In this study, in order to evaluate the migration of heavy metals in enhanced electrokinetic removal，visual minteq was adopted to calculate the species distribution of heavy metals in different pH. Most of the heavy metals except arsenic generated the enrichment near the cathode area. Arsenate always existed as anion such as AsO43-、H2AsO4-、HAsO42-. Near the alkaline area ,the main form of heavy metals were alkali metal hydroxides and seriously restricted the migration and removal of heavy metals. The addition of potassium tetroxalate did not change the species distribution of heavy metals obviously.The nitric acid was more efficient than potassium tetroxalate to condition enhanced electrokinetic removal. Nevertheless ,both of two enhancement still need to be impoved to promote the removal efficiency.
Study on the Biodegradation Strength Properties for Municipal Solid Waste with Higher Content of Organic Matter
Authors: Zhang Zhen Ying , Wu Da Zhi
Published: August 2011

Basing on the new developed direct shear testing instrument, the biodegradation strength properties and strength parameters of municipal solid waste with higher content of organic matter have been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. The proportions of these three parts are 80%, 5% and 15%, respectively. A series of laboratory tests have been performed for different initial void ratios and different vertical pressures applied on the test specimen. Testing results show that the initial void ratio is the main influence factor for the biodegradation strength of the municipal solid waste, the relationship between the biodegradation shear stress and the shear strain is a strain hardening curve, the biodegradation shear stress gradually increases with the shear strain. Besides, the biodegradation shear strength shows a linear relationship to the vertical pressure applied on the test specimen, and it is in accordance with the law of coulomb. According to the testing results, the biodegradation shear strength parameters of municipal solid waste are obtained. The cohesion varies from 11.5 to 24.0kPa, and the internal friction angle varies from 8.3 to 29.0 degree.
The Summary of the Durability of Concrete Parameters Calculation Models
Authors: Cheng Ping Jie , Hu Han Zhou , Hu Shu Guang
Published: August 2011

The durability of concrete structure has become an important field of civil engineering at home and abroad, and how to determine the environmental effects of typical durability of concrete structure key parameters become the key. Proposed by different domestic and foreign scholars to study durability parameters of concrete structure of different models, different models are different in the source, type, model parameters and applicable conditions. In this paper, some typical models are reviewed and analyzed from two major aspects of the durability of concrete, the deterioration of concrete and the steel corrosion.
Study on Heat Transfer Capacity Calculation of Multi-Hole Heat Source for Vertical U-Tube Ground Heat Exchangers
Authors: Zhang Dan , Wang Fa Hui , Lei Bo , Yuan Yan Ping , Cao Xiao Ling
Published: August 2011

By studying the features of vertical u-tube ground heat exchangers, with the consideration of the mutual interference between heat exchanger wells on heat transfer, this thesis puts forward the numerical model and calculation method for the heat exchange study of the well group, on the basis of analyzing heat exchange for single well. The paper adopts a nine-well model which is convenient and represents the general patterns of the heat exchange between well groups. The amount of the heat exchange between well groups can be calculated through testing the heat exchange of the single well by means of the heat exchange correction coefficient.
Experimental Research on the Composite Steel-Concrete Beams with Partial Shear Connection
Authors: Fu Guo , Cui Wei
Published: August 2011

Experiments were conducted on 5 simply-supported composite steel-concrete beams (SCB) with compact steel sections to investigate their deflection behaviors. The influences of degree of shear connection and stud arrangement are discussed. The load-deflection relationships and the interface slip distribution along the span of the beam are analyzed. Based on the experimental research and theoretical analyses, the formulae are derived for the rigidity of the composite steel-concrete beams with partial shear connection. The predicted of deflection values are in good agreement with the experimental results.
Thermal Transport Properties of Ca3Co4O9 with Mg Substitution
Authors: Qi Xiao Ling , Zeng Ling Ke , Fan You Yu
Published: August 2011

Polycrystalline Ca3-xMgxCo4O9（x=0-0.3）ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermal conductivities were measured from room temperature to 673 K. The influence of Mg2+ substitution for Ca2+ on the thermal conductivities of Ca3Co4O9 ceramics was investigated systematically. The influence of Mg doping on the thermal conductivities is mainly embodied in the lattice thermal conductivities, which shows a significant decrease with the increase of the dopant content for the samples with x ≤ 0.2, while the carrier thermal conductivity had no obvious change with Mg doping increasing. These results indicated that the thermal conductivities of the material could be reduced remarkably with the substitution of Mg from 1.427 W/m·K to 0.731 W/m·K at 573 K with x = 0.2.
Experimental Study of Shear Strength of Modified Grout Masonry
Authors: Xue Peng Fei , Mao Da Ling
Published: August 2011

The deficiency of bond capacity of traditional cement mortar was exposed as the new wall materials were used widely. The polyvinyl-butyral(PVB) and methyl cellulose(MC) were chosen as chemical additives to amend the property of normal mortar, the orthogonal tests of 96 pieces of shear specimens were carried out, and the orthogonal analysis of test results was performed. The results indicated that the sort of wall material was the most important factor in bond capacity of mortar, the mixed quantity of polymer and mortar strength follows, and there was a remarkable increase in mortar bond strength when the mixed quantity of PVB and MC was 20%~30% and 0.05%~0.1% respectively.
Flexural Behavior of Concrete One-Way Slab Externally Prestressed with GFRP Tendons
Authors: Gao Dan Ying , Zhu Yu Bin
Published: August 2011

To study flexural performance of one-way slabs externally prestressed with GFRP tendons, a series of experiments were carried out. Based on the results, the load-deflection responses and bending capacities were presented in this paper. Moreover, the influence factors, including the quantity of GFRP tendons and prestressing force, were discussed. Comparison tests proved that the slabs externally prestressed with GFRP tendons will be improved in some aspects, such as ultimate deflection, flexural stiffness, bending capacity, larger deformation before failure.
The Simplified Method to Calculate Two-Dimensional Heat Conduction Equations of Heating Slab
Authors: Li Guo Jun , Li Xiao Ting , Chen Hai Geng
Published: August 2011

The most eﬀective way of determining the whole billet temperature ﬁeld is to use a simulation model. Large amount of calculation as well as computational time is consumed to employ two-dimensional finite difference method since the heating process is extremely complex, then it’s necessary to simplify the calculation process. In this paper, a simplified method in one-dimension format was presented to calculate two-dimensional heat conduction equations of heating slab. The billet simulated was placed in a changeable thermal flux boundary environment, in which the thermal flux was proportional to fourth power of temperature. During the heating process, the changeable parameters were taken into account: i. e different billet dimensions, different billet thermal conduction, different specific heat, etc. The comparision between results of two-dimensional finite difference method and the simplified method verified that the simplified method can satisfy accuracy requirement as well as calculation time saving, which enable the simplified method online using.
The Effect of Electrodes’ Making Methods on the Electrochemical Performance of Nano-Ni(OH)2
Authors: Zheng H. Z. , Zhu Y. J. , Zhang Z. J. , Lin X. R. , Zhou Z. J. , Ye X. C. , Wu S. G.
Published: August 2011

Nano-Ni(OH)2 doped with special elements were prepared by supersonic co-precipitation method. Complex electrodes were prepared by immersion method and handwork method by mixing 8wt.% nickel hydroxides with commercial micro-size spherical nickel as the positive material of Ni-MH battery. The electrochemical performance and cyclic character affected by different electrodes’ making methods were characterized in this article. The result indicates that the discharge capacities of IM electrodes (IM electrodes mean electrodes made by handwork method) are higher than that of HM electrodes (HM electrodes mean electrodes made by handwork method). Furthermore, IM electrodes have better reversibility and higher charge efficiency than HM electrode, and lower charge potential and higher discharge plateau were also observed for IM electrodes. It's worth noting that the phenomenon is more obvious at high charge/discharge rate. When the discharge rate is 0.5C，the discharge capacity of IM electrode is higher 67.1 mAh•g -1 than that of HM electrode.
Effect of Welding Parameters on Stress Distribution of Weld-Bonded Joints
Authors: Zhang Bao Wen , Lin Jian Ping , Lu Zhi Guo
Published: August 2011

In the weld-through technique of weld-bonding process, adhesive usually suffers extremely high temperature, causing damage to adhesive and consequently the joint strength. The present work studied the effect of welding parameters on the stress distribution of weld-bonded joints under tensile loading. The adhesive properties at elevated temperatures were first presented based on the experiments. Then a finite element model was developed to predict the temperature distribution of weld-bonded joint in the welding process. Effect of welding parameters on the dimensions of weld nugget and adhesive failure zone was obtained. At last, the stress distribution of weld-bonded joint under tensile loading was studied through finite element method. It has been found that both the stress near the adhesive failure zone and the maximum stress of weld nugget decrease when the welding current increases.
Forward Kinematics Analysis of a Four-Cable-Driving Parallel Robot
Authors: Shao Xing Guo , Zhu Zhen Cai , Cao Guo Hua , Li Yi Lei
Published: August 2011

This paper studies the forward kinematics of a sinking winch mechanism, which is in category of four-cable-driving parallel robot. Thetension states (tautness or slackness) of cables are firstly taken into consideration in the forward kinematics model. We propose atraversalalgorithmto solve the model. Both pose of platform and the tensions in cables can be solved if the lengths of four cables are given. The effectiveness of the algorithm is demonstrated by three examples. The results of this paper can be used to measure the pose of platform and the tensions of cables from the lengths of four cables.
Delayed-State-Feedback Fault-Tolerant Control for Fuzzy Markovian Jumping Systems
Authors: Liu Chuan Xi
Published: August 2011

This paper is concerned with the robust delayed-state-feedback fault-tolerant control problem for fuzzy markovian jump systems with time-varying delay. A new criterion of delayed-dependent robust fault-tolerant stabilization for such systems is established in terms of linear matrix inequalities (LMIs) by using Lyapunov stability theory and free-weighting matrix methods. Based on the obtained criterion, designed hybrid controller combining state feedback and delayed state feedback can guarantee robust asymptotic stability in mean square sense for the resulting closed-loop system not only when all control components are operating well, but also in the presence of some outages of actuators within a prespecified subset of actuators.
Research on the Microstructure and High Temperature Creep Behavior of In Situ TiC/Ni Composite
Authors: Zhao Li Ping , Liu Zong De , Wang Song , Liu Jun Peng
Published: August 2011

TiC/Ni composite material was synthesized by melt in-situ reaction from mixed Ti, C, Mo and Ni powders. Microstructure and phase composition of the composite were characterized by SEM and XRD. Creep behavior of the composite had been investigated under constant tensile stress, and the creep damage of the creep specimen was characterized by elastic modulus. The results show that the composite consists of nearly spherical TiC particle and Ni, the addition of Molybdenum has effect on refining the size of TiC particle; the mechanism of creep fracture is inter-granular fracture; relative variable curve of modulus resemble to creep curve, the method of elastic modulus is well to characterize the creep damage.
Research on Lubrication Properties of Water-Lubricated Rubber Bearing Based on Fluid Structure Interaction
Authors: Wang Ru Yi , Liu Zheng Lin , Jin Yong
Published: August 2011

The 3D computational fluid dynamics (CFD) model and fluid structure interaction (FSI) model of water-lubricated rubber bearing with 10 axial grooves was built by ADINA and the influences of axial velocity, rotating speed on deformation of bearing bush and distribution of water film pressure are researched in this article. The results show that elastic deformation of bearing bush reduces water film pressure relative to rigid assumption; with the increasing of axial velocity, the deformation of bearing bush and water film pressure increases; and the axial velocity has a obvious influence on the front of bearing bush and water film pressure; with the increasing of bearing rotating speed, the deformation of bearing bush and water film pressure raises, but the deformation of bearing bush and water film pressure in water grooves are almost close to zero.
A Modified Dynamical Ternary Model
Authors: Yi Zhi , Zhang Wei Jun , Cui Miao , Li Guo Jun , Chen Hai Geng
Published: August 2011

A Ternary Model is established for heat transfer in a reheating furnace. Temperature field for furnace walls was solved by implicit difference of non-uniform gridding. The temperature of billet surface was dealt with for coupling the finite difference method with the Ternary Model reasonably. Finally the 3# reheating furnace in Baosteel was simulated. Temperature fields of billet and walls are solved by the proposed approach, and the results are analyzed, which provides theoretical basis for thermal operations as well as the online applications of the Ternary Model.
The Effect of Particle Size on the Properties of Alumina-Based Ceramic Core
Authors: Bin Zuo , Wang Li Ge , Yang Gong Xian , Zhou Yong Sheng , Wang En Ze
Published: August 2011

As source of ceramic core, the raw materials play an important role in determining the properties of ceramic core. In this paper, the effect of matrix Al2O3 particle size on the properties of ceramic core during fabricating is mainly studied and discussed, the test results show that reasonable particle size match of coarser, middle and finer matrix Al2O3 will be beneficial for properties of ceramic core. Matrix Al2O3 powders with double peak or multi-peak can form denser packing and help to increase the ceramic core’s strength than powders with single peak can. The influence of middle Al2O3 particle size is great for its large proportion in matrix materials, and its optimal particle size range is between 23~28µm.