bluuebunny/crossref_metadata_2025 huggingface dataset:
Fatigue Damage Analysis of Monolithic Joint of Steel Truss Bridge Considering Welding Residual Stresses
Authors: Wang Wen Li , He Jie , Zhang Mang Mang
Published: August 2011

This investigation firstly performs a thermal elasto-plastic analysis using finite element techniques to evaluate residual stresses in monolithic joint weldments, then develops an effective procedure by combining the welding residual stress and dynamic responses by moving train loads , finally calculates the stress history of hot spots in local weldments .The results showed that the stresses of some hot spots in weldments had exceeded the yield stress of steel , so the fatigue of these spots should be categorized into low cycle fatigue; the load application on the welded bridge produces a reassessment of the stress field in the weldments and, in particular, a relaxation of the maximum stress.
Variation Characteristics of Sunshine Time in Changjiang River Valley in Recent 50 Years
Authors: Han Shi Gang
Published: August 2011

By using the sunshine time data from 260 meteorological observation stations in Changjiang river valley from 1960 to 2009, the features of sunshine time in this area are studied. The results show that the highest sunshine time place is Qinghai-Tibet Plateau which is located in the source of the Changjiang river, and the sunshine time is about 2200-3000 h.a-1. The lowest sunshine time place is Sichuan Basin , and the sunshine time is about 1000-1600 h.a-1. The place of middle sunshine time is the midstream and down stream of Changjiang river, and the sunshine time is about 2000 h.a-1. There is a trend of decreasing with the sunshine time in zone 1, and the value is 54.2 h.10a-1. The decreasing value of zone 2 is 38.3h.10a-1. There is a trend of “rise first, down after” with sunshine time in zone 3. There is obvious seasonal difference in sunshine duration，with bigger decreasing amplitude in summer and winter than that in autumn. The variation trend of sunshine time is not obvious in spring.
Effect of Melamine Content in MUF Resin on the Durable Properties of Plywood
Authors: Liu Xiao Ying , Zhang Ji Zhi , Yang Yong Lin , Zhang Shi Feng , Li Jian Zhang
Published: August 2011

The effect of melamine content in melamine modified urea formaldehyde (MUF) resin on durable properties of plywood was investigated using ammonium chloride (NH4Cl) with different melamine/urea (M/U) ratios. The plywood specimens were exposed to laboratory accelerated aging and/or cyclic soak-dry (SD). The experiment results indicated that the melamine contents in MUF resin showed an unobservable effect on the durable properties of MUF resin bonded plywood. The mechanical properties of plywood decreased more severely after accelerated aging test in acidic condition. However, the influence of different curing catalyst contents on mechanical properties and formaldehyde emission of UF resin can be minimized by adding melamine to the resin.
Study on Enhanced Pretreatment Process of Coagulation Sedimentation by BAF
Authors: Shen Liang , Wang He Li , Qi Jing Xian , Sun Hun Chao
Published: August 2011

Using coagulation sedimentation process in the advanced treatment of urban secondary effluent which can be recycled to circulating cooling water system in power plant is only perform well on turbidity removal. But the concentrations of organic matter and NH3in effluent can not meet the requirements of circulating cooling water. Therefore, the feasibility of biological aerated filter (BAF) as a pretreatment enhancing coagulation sedimentation process was studied. The results show that the BAF pretreatment removes NH3effectively, and the turbidity and CODCrof effluent of BAF-coagulation sedimentation process is much lower than individual coagulation sedimentation process. The final effluent qualities meet the requirements of circulating cooling water system in power plant.
Analysis and Research of Biofilter Clogging at Low Temperature
Authors: Liu Bing Tao , Wang Hai Rong , Zhang Li
Published: August 2011

Workmen for the wastewater treatment advocated wastewater reusing in the conference which the technically development and strategic research of China are main topic.Biofilter is useful as tertiary biofilm reacter.However, it often accrues clogging during cold period and needs frequent backwashing. Backblowing and partial backwashing can slow it. The average flux rised from 2.65 m3/m2.h to 2.84 m3/m2.h. The removal of NH3-N of cocurrent-flow and counter-flow biofilter can be improved. The parameter of partial backwashing depended on the rate of expanding.of counter-flow biofilter.The effect of different backblowing parameters on flux of cocurrent-flow biofilter would be described in this paper. From the parameters studied the bioifiltration time is the most important factor affecting the flux. The results show that the best flux is obtained when backblowing was made for 60s every 12h during 72h where the air pressure was 63 m3/m2.h and water pressure was 25.2 m3/m2.h.
A Study on the Sharing Mechanism of the Building Energy-Saving Efficiency of the EPC Project in China
Authors: Yang Xin Yuan , Zhou Jing Hai
Published: August 2011

With the development of building energy-saving in China, energy performance contracting, a new energy management system is introduced. Through the analysis of current situation and trends based on domestic and international energy service industry, and also through the research of benefits sharing model between the Energy Service Company and its customers, the author establishes an energy efficiency sharing model, which contributes to the Energy Service Company to avoid operational risks, ensure its operating income, and finally promote the scientific development of energy industry. The advanced EPC model is of great importance in promoting the work of building energy in our country.
A Study on Response to Global Climate Change the Community Environment of Taiwan in the Construction of Evaluation System
Authors: Chiang Che Ming , Kuo Yi Chun , Chou Po Cheng
Published: August 2011

The frequent occurrence of extreme climate phenomena around the world has not only resulted in rainstorm, snowstorm and other abnormal environmental phenomena, but also threatened the economy and lives of people; therefore, this study, oriented by the development of environmental assessment mode in residential communities in Taiwan under the changes of climate, based on SBTOOL, increased dimensions like “Community Symbiosis Environment and Life” and “Disaster Prevention and Community Security” for the assessment and obtained relative weights between different assessment indices, and, according to opinions of experts in Taiwan and analysis results, besides “Consumption of Energy and Resources” and “Environmental Load”, domestic experts also pay attention to the development of “Community Symbiosis Environment and Life” and “Disaster Prevention and Community Security”.
Preparation and Performance Study of Nano-Titanium Dioxide
Authors: Huang Ling , Wei Zi Hui , Ji Shu Liang
Published: August 2011

To study the photocatalytic of nano-crystalline TiO2 and P/TiO2, nano-TiO2 and P/TiO2 photocatalyst was synthesized by sol-gel process. In the examination, with C2H5OH as solvent, Ti(OBu)4 as precursor and glacial acetic acid as inhibitor. The effect of gelation time by different reaction factors was studied during the examination. The optimum reaction conditions for preparing transparent stable TiO2 gelation are that the temperature is kept at 40°C, the pH value of solution is 2.5，and the molar ration of Ti(OBu) 4:C2H5OH:H2O:CH3COOH is 1:2.5:5:1.5.On this basis, the P/TiO2 composite materials were prepared. The microstructure，morphology and photocatalytic activities of as-prepared nano-TiO2 were studied using X-ray diffraction (XRD) and ultraviolet-visible (UV-vis) spectrophotometer,the photocatalytic efficiency was studied by investigating the photodegradation of methyl orange. Compared with pure nano-TiO2,P/TiO2 had better photocatalytic activities under UV, but little improved under Vis.
Special Rice Husk Concrete in Egypt
Authors: Al Sheikh Saeed Ahme
Published: August 2011

In the late few years, Egypt has been suffering from a dark clouds resulting from burning rice husk. Studies have been undergoing to study the possibility of using rice husk instead of burning it and soiling environment. The construction industry plays an important role in many countries. Waste materials are new challenge choice for use as construction materials, because construction materials coming from a natural source are irreversible. Rice Husk Ash (RHA) is one of waste materials from agricultural industry. It has some special characteristics that can enhance the properties of concrete, when it is used as a part of the ingredients in concrete mixes. The objective of this paper is to study the mechanical properties of concrete containing ordinary Portland cement, rice husk ash and super plasticizer compared to the silica fume concrete. The water cement ratio was equal to 35% by weight for all tested specimens whereas the slump was constant at 100 +/- 20 mm.
Fully Coupled Dynamic Analysis of Earth and Rock-Filled Dam
Authors: Hu Jun , Xu Xu Ling
Published: August 2011

The coupled 3D Dynamic Mechanical/Fluid is performed for the Nuozhadu earth and rock-filled dam by FLAC3D, but literature on the fully coupled of fluid-solid under earthquake is not too much. This paper gives a good example of applying FLAC3D to do the fully coupled simulation, and after a system in mechanical and fluid is got, the dynamic simulation can be done. A more accurate estimation of pore water pressure and the distribution of acceleration and irrecoverable displacement of the dam under dynamic are obtained. The result shows that permanent displacement would occur in the potential slide mass of the slope under earthquake. Finally the method to improve the slope stability is suggested. The results provide important references to the design.
Research on Numerical Computation of Natural Frequency of Transverse Vibration for Simply Supported Beam of Non-Uniform
Authors: Qian Bo
Published: August 2011

Recursive and inexplicit differential equation of the second order with variable coefficients is derived from the fourth order linear homogeneous differential equation with variable coefficients of transverse vibration of non-uniform beam, which is about deflection and bending moment according to boundary conditions and order reduction. By finite difference method, numerical computation and accuracy are studied for natural frequency of transverse vibration for simply supported beam of non-uniform. Theoretical analysis and orthogonal computation examples show that numerical computation algorithm is very simple, and accuracy of computation depends on variety rate of gradually changed cross section in vertical direction and numbers of computation step, which is independent of width and length of beam; numerical accuracy of computation is estimable for given length or numbers of computation step; and reasonable length or numbers of computation step is determinable for given accuracy demand.
Finite Element Modeling for RC Hollow Columns Wrapped with FRP Laminates
Authors: Mahmoud Ashraf Mohamed
Published: August 2011

A finite element reinforced concrete model has been analyzed by the author with Ansys v.9 finite element program for both unstrengthened and CFRP-strengthened hollow columns using solid65 concrete element, its size 24x26x24 mm and Link8 discrete steel distribution element. The CFRP has been modeled using Solid46 element, which has orthotropic properties. The deflection results have been compared with an experimental and other finite element model which are performed by Lignola [6], in which using Tno Diana v. 9.1 finite element program for modeling concrete using three-dimensional solid brick element type Chx60, steel using embedded reinforcement truss element and CFRP using three-node plane bonded element. These results show that the author's model is much better than the Lignola's [6] model comparing with the experimental one. A parametric study has been done on the proposed model for obtaining the effect of using the GFRP instead of the CFRP in column strengthening by comparing the failure loads and the concrete and steel properties at failure. This study show a reduction in the failure load values by an amount 0.6 to 2.8% when using GFRP, indicating that the CFRP is more preferable in strengthening of the hollow column than the GFRP.
Strategy of Transformation on Existing Residential Buildings for Energy Saving in the North of China
Authors: Wang Xue Ying , Xu Dong , Wu Ya Jun
Published: August 2011

A general numerical simulation method is presented for the analysis of the dynamic interaction problem between a large-span concrete culvert, discretized by a plane strain finite element model (FEM), and a dynamic system of vehicle traversing at various speeds. The vehicle is represented as a mass-spring-damper FEM system with seven degrees of freedom. The time-variable coupled dynamic system is solved by a step-by-step solution technique using Newmark’s integration scheme. The backfill soil elastic modulus is modeled as varying linearly with depth below the ground surface. Several numerical examples are investigated by modifying different parameters such as backfill height and road surface stiffness, respectively. The dynamic displacement response for the mid-span point of the concrete culverts is analyzed, as well as the displacement impact factor. The research results demonstrate that the impact factor changes with the vehicle speed and strongly depends on the road surface roughness conditions.
Finite Element Analysis of Abutment Pressure Distribution Characteristic of Working Faces in Fully Mechanized Sublevel Caving Face
Authors: Xia Hong Chun , Song Zhen Qi , Ru Li Jing
Published: August 2011

The elastic-plastic constitutive relationship and the Drucker-prager yielding criterion are used to simulate the behaviour of non-linear geo- materials. Dynamic change laws of abutment pressure of S2S2 work face of xiaokang coal mine is simuluted by the ansys program. It is shown that the distribution of abument pressure can be divided into two zones, elastic region and plastic region. The front inside the 13m distance is plastic zone. The zone outside 13m distance is elstic zone. The affecting scope is 144m when the concentrated coefficient of abutment pressure is 5%. The affecting scope is 160m when the concentrated coefficient of abutment pressure is 3%. The simulation provides a reference bases for the application and promotion of thick seam mining technology.
The Forming Principle of Reflection Cracks of Composite Lay in Old Bridge Reinforcement
Authors: Zhang Dao Ming , Guo Xue Dong , Zhang Ming Liang
Published: August 2011

In order to study the transverse reflection crack of concrete composite lay in old bridge reinforcement, aiming at the forming process of the reflection crack, the theoretical model of its peak tensile stress and its separation distance is presented, and its forming mechanism is analysed. Based on the theoretical model, the influence of the thickness overlay, and constraint under the concrete composite lay are studied to the transverse reflection crack. Based on these researched results, the peak tensile stress and its separation distances is calculated by given theoretical model , and the results reveal shrinkage cracks rely on the restraint condition , elastic modulus, shrinkage ratio and the thickness of the composite-slab.
A Plastic Deformation Behaviour of PVC Coated Plain Weave Membrane under Relaxation Condition
Authors: Zhang Wu Lian , Ding Xin , Yang Xu Dong
Published: August 2011

To recognize the interrelationship of plastic deformation with strain and time, uniaxial tension relaxation experiments of PVC coated plain weave membrane were executed along the warp and weft direction, while plastic deformation of the specimen were measured in 1 year. Using multiple functions from the product of both the strain difference (strain- critical strain) power function and the time power function, the experimental data was studied on a multiple regression analysis. It was concluded that the model had better fitting results. At the same time, an instantaneous plastic and a relaxed plastic term of the total plastic deformation were analyzed. It was showed that the instantaneous deformation was the main part of the plastic deformation, that the relaxed plastic deformation was the minor part of the plastic deformation, and the relaxed plastic deformation would become smaller and smaller with time extension.
Effect of Adjustable Deflectors on Building Facade on Diverting the Distribution of Aerosol in Micro Climate Wind Field
Authors: Huang Chih Hong , Wang Kuang Yu
Published: August 2011

Aerosol particles in urban areas are deposited in street canyons due to the wind field generated by building blocks. The purpose of this study was to discuss with CFD software the effect on lowering the aerosol concentration in urban space by means of active and auxiliary adjustable wind deflectors installed on the building facade to divert and control the micro-climate wind environment surrounding the buildings. The results suggested that, the wind deflector could produce an enormous improving efficiency for channelizing the particles.
Study and Analysis: Mechanism of Vacuum Preloading, Stress of Soil
Authors: Lei Ming
Published: August 2011

Several viewpoints of vacuum preloading mechanism were analyzed. Action process of vacuum preloading was compartmentalized three phases. They were seepage consolidation in shallow soil and “surcharge” effect in deep soil by vacuum suction, consolidation stabilization in the shallow soil and transformation of “surcharge” to “negative pressure” in deep soil, seepage consolidation in deep soil under “negative pressure” and to balance. Action mechanism root of vacuum preloading was not negative pressure difference solely, which was produced by seepage field. The root was “positive pressure” and “negative pressure” together during different stage. The root also included the two pressures superposition under the especial phenomenon of vacuum preloading: water level falling. Under the mechanism, stress of soil was analyzed. Effective stress path began from line resembling that under surcharge in q-p plane. It would never reach line and after a short period it would develop paralleling p-axis. Horizontal contractive displacement of soil took place because “negative pressure” intensity was much stronger than “positive pressure” intensity. If surcharge effect equal vacuum preloading effect, soil under vacuum preloading reached yield more difficultly. Last, measured value was analyzed and the analysis of mechanism, stress was validated.
Tentative Search on Green Design of Contemporary Urban Garden Landscape
Authors: Huang Wei Yong , Wang Li
Published: August 2011

The paper summarized and thought problems existing in construction of the urban garden landscape, and analyzed the applicable advantages, technical characteristics and implementation plans of green materials and the renewable energy in the construction of the urban garden landscape. That guided by Evaluation Standard for Green Building and ecological theory, with a view to have implication for the construction of the urban garden landscape.
Ultra-Long Well-Orderly Organic Nanowires Arrays Based on Solution Process
Authors: Liu Nan Liu , Xu Wei
Published: August 2011

Ultra-long highly ordered organic nanowires arrays were in situ self-assembled directly on the silicon substrate over a large area based on solution process. The location and the orientation of the nanowires arrays can be easily tuned and controlled by optimizing the motion of the substrate and the solvent evaporation rate during dip-coating process. By precisely adjusting the motion of the substrate, the length limits for nanowires in array caused by the sticking-slipping motion of the contact line in a concentrated solution have been successfully broken through. The longest nanowires array with a length of around 1000µm was obtained from concentrated solution.
Determination of Trace Silver in Water by FAAS after Concentration and Separation by the Modified Organobentonite Using Dithizone
Authors: Zhang Dong , Zhang Yan Li
Published: August 2011

A new modified organo-bentonite using dithizone(D-O-bentonite) was used for preconcentration, separation and determination of silver(I) in natural water by flame atomic absorption spectrometry (FAAS). The experimental conditions for effective adsorption and elution of trace levels of silver (I) were optimized with respect to different experimental parameters. The influences of some common coexisting ions were also examined. The results show that the silver ion could be adsorbed on the D-O-bentonite. The adsorbed quantitively was affected by the pH value of medium and contact time. In the medium of pH 4-8, the contact time was 15 min, and capacity of the sorbent was 19.7 mg·g-1. The silver(I) adsorbed on the sorbent could be completely eluated by using 1 mol·L-1HNO3. The preconcentration factor is 100. The detection limit of the method for silver was 0.02 µg·L-1. The method was applied to the pre-concentration/separation of silver in the environmental water with satisfactory results.
Removal of Hg (II) from Waste Water Using Nano-Barium-Strontium Titanate Coated by Dithizone
Authors: Zhang Dong , Zhang Yan Li
Published: August 2011

The adsorption capability of nano-barium-strontium titanate coated by dithizone(BST- dithizone) for mercury in environmental water samples was studied. The optimum experimental parameters for the adsorption and desorption of the mercury, such as pH values, contact time and eluent, have been investigated. The results showed that the mercury ion in water could be adsorbed on the BST- dithizone. The adsorption capability was affected by the pH value of medium and contact time. In the medium of pH 3-8, the adsorption time was more than 15 min, and capacity of adsorption was 15.3 mg·g-1. The used adsorbent could be completely regenerated using 2 mol·L-1 HNO3. A new method for the removal of mercury in water samples was proposed. The method has been applied to the removal of mercury in waste water samples with satisfied results.
Analysis of Mechanical Property of Taniguchi Bridges in Mountainous Areas Loaded by Fluctuating Wind
Authors: Wang Zi Jian , Wu Li Ming , Xiong Huan
Published: August 2011

Besides live loads like cars,earthquakes and people,wind loads should not be neglected on small bridges in mountainous areas,especially by taniguchi and mountain pass.This text does an analogue computation taking a typical slant legged rigid frame bridge in a mountainous area of Chongqing. This bridge lies in the taniguchi of mountainous area where wind condition is complicated.Mathematical model conforming to the local wind load should be established according to the meteorological and hydrological conditions of the bridge site and hydrodynamics and energy conservation principle in order to truly reflect the actual condition of wind in bridge site. Comparing with the calculating result by ANSYS and model of static wind load for normal design, it shows that model of fluctuating wind load established almost accords with the model of static wind load which provides a new train of thoughts and method for further promoting the model of wind load to lead the wind-resist design of bridge construction of taniguchi in mountainous area to better approximate to the real facts.
Performance Evaluation of Ground Heat Exchanger by Changing Water Volume
Authors: Li Qiong , Liu Hong Wei , Cui Lei , Pan Tian Quan
Published: August 2011

This paper summarizes existing evaluation methods of ground heat exchanger performance. Based on the characteristics of heat transfer in variable flow, comprehensively considering the similarity law of momentum transfer and heat transfer law, the performance of ground heat exchanger was evaluated in winter conditions by a comprehensive heat performance evaluation method – a combination of unit tube length for heat and pumps power consumption.
The Experiment and Theoretical Analysis of Reusing Waste Cement Mortar
Authors: Zha Xiao Xiong , Zhang Kai
Published: August 2011

This paper presents the idea of mixing waste cement mortar into foam concrete block, and gets the foam concrete testing models with the values of dry density at 700 to 1000 kg/m3 , and the compression strength at 0.5-2.5MPa, which are met to foam concrete block standard. At the same time, the power formulas for calculating the dry density and compression strength of concrete cubes doped with waste cement mortar have been brought up, which are coincided with the experiment results well. An initial discussion about microcosmic composition has also been given, which has rather high practical application values since it offers experimental and theory foundations for reusing the waste cement mortar. The innovation significance should not be neglected, since it is the first time doing research on these aspects.
Energy-Dissipation Mechanisms and Seismic Design Recommendation of Eccentrically Braced Steel Frames
Authors: Zhao Bao Cheng , Gu Qiang
Published: August 2011

Eccentrically braced steel frames are a lateral load-resisting system which apply high intensity area and it can provide the high elastic stiffness that met higher steel building drift requirement. This paper first provides an introduction of Forces in links and Energy dissipation mechanisms of eccentrically braced steel frames. In that Eccentrically braced steel frames will collapse after the link beams go into plastic deformation under earthquake load, A new analytical model which include shell element apply to link beams with large deformation and plastic deformation and beams element apply to other parts of structure is presented in this paper for analyzing eccentrically braced steel frames energy-dissipation behavior and collapse mechanism. Computer program is complied. After this paper applies nonlinear finite element program to analyze the behaviors of eccentrically braced steel frames under cyclic load, the seismic design recommendations of eccentrically brace are presented.
In-Plane Buckling Analysis of Gabled Arch Frame Steel Building
Authors: Li Jun , Wang Yuan Qing , Chang Ting , Shi Fei
Published: August 2011

In order to study characteristics and rules of the in-plane stability for gabled arch frame steel building, a well-known FEA software package ANSYS has been used to calculate the in-plane buckling of a gabled arch frame which has a span of 30m. The linear and extreme point buckling loads have been obtained under the circumstances of different rise-span ratio, full-span and half-span distributed load and initial deficiency. Then the buckling path for this kind of structure has been given. Finally, the buckling deformation rules were proof and the influence of rise-span ratio, load conditions and initial deficiency were also discussed.
Mechanical Properties of Adobe Masonry in Shear Test
Authors: Wu Feng , Li Gang , Jia Jin Qing , Li Hong Nan
Published: August 2011

There are many adobe buildings in small towns and villages of China, which have low shear strength of mud in joints and suffer great damages in big earthquakes. Mud with three different proportions of soil and sand are used in adobe masonry to discuss shear behavior and strength in this paper. Adobe samples in tests were laid by mud with clay-silt soil: construction medium sand at ratios of 1:0.8, 1:1.0 and 1:1.2 respectively, and adobe brick at ratio of 1:1.0 which has good workability. Short straws are mixed into mud and brick at 0.5% by weight. By monotonous loading procedure parallel to bed joint, two bed joints in prisms behave double shear failure in sequence. Meanwhile shear strengths and force-displacement curves are also obtained. Fitting equation for adobe shear strength is calculated, and the calculated results are agree with test results well. Shear failure of adobe masonry behaves brittle from force-displacement curves.
Cement Concrete Pavement Cracks and Prevention
Authors: Wang Yu Qiang , Qiu Jian , Deng Cun Guo
Published: August 2011

The cement concrete pavement surface are high, and its rigid structural integrity depends on the integrity of institutions and the plate itself, the overall rigidity of the lower body performance. However, the current board of cement concrete pavement breaking, cracking of roads has become an important common quality problems. For cement concrete road surface plate, the type of cracking, resulting in destruction of the reasons, etc., proposed prevention measures and precautions for disposal for the relevant officers.
Study of Effect of Chemical Activators and Mineral Admixtures on the Strength of HFGD Gypsum - Fly Ash Cementing Material
Authors: Wang Xin Tang , Zhang Yi , Yin Jie , Xie Zhi Guo
Published: August 2011

A kind of FGD gypsum from Ningbo Beilun Power Plant of China and fly ash were used as the raw materials with which a complex cementing material was made. Effect of the related factors such as water proportion, mineral admixtures and chemical activators on characteristics of Hemi-hydrate FGD gypsum-fly ash complex cementing material is studied through a number of single factor experiments. The experimental results show that an appropriate amount of admixtures can effectively improve the strength of the Hemi-hydrate FGD gypsum–fly ash complex cementing material presented here. It is concluded that the strength of HFGD-FACM is best as the ratio of HFGD gypsum and fly ash is 1:1 and proper water aggregate proportion is 0.45~0.50.
Experimental Study of Post-Fire Performance of Ceramsite Concrete Filled Steel Tabular Columns
Authors: Wang Xin Tang , Yin Jie , Zhou Ming , Wang Jian Min
Published: August 2011

The post-fire performance of a set of ceramsite concrete filled steel tabular short columns (noted as CCSSC) after exposure to fire are experimentally studied. Effect of the maximum value of fire response temperatures and geometrical parameters of the composite columns on the strength and ductility of the specimens were especially discussed. The test results show that the specimens of CCSSC have higher post-fire bearing capacity and better ductility, and both of maximum response temperature and geometrical parameters of the specimens presented here have great effect on the post-fire bearing capacity and ductility of ceramsite concrete-filled steel short columns after exposure to fire.
Study on Mechanisms of Rare Earth Elements on Improving Thermoelectric Properties of RExCo4Sb12
Authors: Liu Ke Gao , Li Jing
Published: August 2011

It is the important way to improve thermoelectric properties of skutterudite materials by doping with rare earth elements. The mechanisms of improving properties of bulk RExCo4Sb12materials prepared by mechanical alloy and spark plasma sintering (MA-SPS) at 650°C were investigated by analyzing the composition, microstructure and atomic occupying locations. According the results it can be considered that the mechanism to improve the thermoelectric properties of rare earth elements is that rare earth element Ce in the samples mainly plays the doping role in reducing the resistivity of the sample and improving the conductivity, so that it makes the figure of merit ZT of samples increase significantly.
Vibration Analysis of a Flexibly Connected Double Span Beam Traversed by Uniformly Distributed Moving Load
Authors: Yang Yu , Yang Yun Fang , Cai Qi Mao
Published: August 2011

Considering the engineering background of high speed transportation systems such as maglev, vertical vibration of a flexibly connected double span beam is studied. The beam can be taken as two Euler-Bernoulli beams flexibly connected by an elastic joint and the model of it bearing moving distributed load with constant speed is then established. Duhamel integral as well as mode superposition method is applied to solve the dynamic responses of the beam. Numerical analysis base on different parameters such as the length of the train, the span of the beam and the velocity of the train are compared. The following conclusions are made:(1) the left span and right span’s dynamic responses is different so that each span should be analyzed separately; (2)the dynamic response of the beam is tied up with the factors such as the frequency of the beam, the moving frequency of the load and the relative bending stiffness of the joint.
The Presentation Research of Architectural Shock-Isolation Technology in Guangdong Science Center
Authors: Zhang Ji Chao , Ji Lei
Published: August 2011

It is the first time to adopt shock-isolation technology in giant steel frame structure in Guangdong Science Center E area, by using remote wireless automatic monitoring system, it executes health monitoring of isolation bearings. Based on the platform of Guangdong Science Center, it shows scientific presentation of new technology and plays a key role in popular science education, which will promote the application of shock-isolation technology in structural engineering field.
Measurement and Analysis of Multi-Functional Stadium of Guangdong College of Pharmacy
Authors: Zhang Lei , Meng Qing Lin , Li Jin
Published: August 2011

As stadiums have high energy consumption in architectural lighting and air conditioning, how to make full use of natural lighting and natural ventilation is the key to architectural energy conservation. To this end, many passive energy conservation measures have been taken into account in designing Multifunctional Stadium of Guangdong Pharmaceutical University. For instance, strip light windows with vertical shading have been installed on east and west facade, open external windows on south and north facade, and green roof on Auxiliary Stadium etc. Test result of the Stadium shows that the above-mentioned passive design methods are able to increase natural light intensity of the playing field and prevent glare, improve wind velocity of natural ventilation and comfort in spectator areas, reduce inner surface temperature and thermal radiation of the roof on Auxiliary Stadium.
Optimization Design of Anti-Sliding Pile Based on Genetic Algorithm
Authors: Xu Yin , Xu Qing
Published: August 2011

It is important to search the position of the dangerous sliding surface and to design the reinforcement measures in the study of the slope stability. At present, anti-sliding pile is one of the popular reinforcement measures. In this paper, to optimal design the anti-sliding pile, the residual thrust method (RTM) and genetic algorithm are carried out, while the idea that based on the position of the largest anti-sliding force rather than the most dangerous sliding surface to design the anti-sliding piles is presented. The new idea eliminates the possible unsafe situation. In the process of the optimization design of anti-sliding pile, firstly, chromosomes in the genetic algorithm are coded by using decimal method. Secondly, taking the residual thrust as the fitness function in the genetic algorithm, cross probability and mutation probability are all adjusted according to the fitness of individual population, while the best individual population is saved as population of the next step so that to improve the efficiency. Finally, the sliding surface which needs the largest anti-sliding force is searched out. The reasonability and the reliability of the idea are verified by an example.
The Analysis of Ballast Settlement Data Based on Time Series
Authors: Ni Tie Shan
Published: August 2011

The stability of ballast is the key to guarantee the traffic safety. This paper is on the back -ground of ballast settlement monitoring of a bridge constructed by jacking method. And the bridge is located at the 1094 kilometers in Jingha railway line. Monitoring data is analyzed by the time series method. Then we build an ARIMA model for these data. Through the AIC principle, the orders of the model are obtained. Then we predict the settlement of the ballast. By the comparison of predictive value and the true monitoring data, it shows that using time series to analyze the settlement of ballast is reasonable and reliable. Therefore it is a new method to analyze the settlement of ballast. At the same time, this method only relay on the monitoring dates but not on other conditions.
Experiment Study on the Performance of Manganese Slag Powder Asphalt Mixture
Authors: Qin Feng , He Zhuang Bin , Huang Qiong Nian , Su Lin Qi
Published: August 2011

In order to inquiry the effect of manganese slag powder on the asphalt mixture pavement performance, With the asphalt mixture specimens produced by adding manganese slag powder of 1.5, 3.0, 4.5and 6.0 % into AC-16I asphalt mixture, the Marshall test, freeze thaw split test and rutting test were conducted. From the diagrams the corrosion resistance and high temperature stability performance and low temperature anti-cracking performance of these manganese slag powder asphalt mixture were determined. It was observed that high temperature stability performance and corrosion resistance began to significantly increase by adding rubber. By the analysis for the pavement performance mechanisms of manganese slag powder asphalt mixture, the change relation between manganese slag powder mixing amount and asphalt mixture pavement performance is presented.
Implementation Technique and Application of Panoramagram Mosaic
Authors: Cao Yu
Published: August 2011

Panoramagram is the important research field based on image rendering technology in recent years. It is a new exploratory subject of computer image processing. This article describes the characteristics of panoramagram, application technique and the application area of panoramagram mosaic.
Exploration and Practice on Learning Field-Based University Basic Computer Course Reform
Authors: Liu Xing Yi
Published: August 2011

Learning field curriculum program is a curriculum model in which thematic unit are designed and organized according to the process of professional task and work, which is a core in curriculum development of modern vocational education in German. This article describes the curriculum reform in learning field and its three basic elements in curriculum model concerned. Moreover, taken Basic Computer course as an example, the paper details the whole process of organization of the learning field curriculum model, such as teaching content designing, teaching and implementing.
Radar Electronic Opposed System Simulation
Authors: Wu Zhong , Jia Meng
Published: August 2011

Seen from the latest local war, the air-lined radar opposition has become a key instrument through out the war. It effects on the process and results. The air-lined radar opposition is not only a guarantee of the war, but also a military hit force. So the study of air-lined radar opposition is good for the victory of the war. The paper has concluded and created the criteria of the radar, constructed the model of foil opposition and proved that the capability had decreased apparently. The paper has studied the air-lined radar electronic opposed simulation system, simulated the platform of air-lined radar electronic opposed system. The system is a good tool to train the talents of electronic opposition.
Research on Prediction of Excavation Deformation Based on Fuzzy Neural Network
Authors: Chen Xiang , Zhou Xue Feng
Published: August 2011

Seeing that there are a lot of uncertain and fuzzy factors in the deformation control system of excavation, in this paper, the author combined the fuzzy theory with neural network technology, adopted the ordinary non-linear structure as the fuzzy neural network of neural network structure formed of neuron directly, and it is under the degree fuzzy number which inputs and export the information to import the corresponding network. Thus according to fuzzy neural network, displacement prediction model has been set up.
Aerodynamic Shape Optimization of Shenzhen Kingkey Financial Tower
Authors: Shi Bi Qing , Xie Zhuang Ning , Ni Zhen Hua
Published: August 2011

A study of approach aerodynamic shape optimization of a high-rise building, Shenzhen Kingkey financial tower, was performed in a boundary layer wind tunnel at Shantou University. Building shape has significant effects on the wind load forcing on the structure. The peak overturning moments about x-axis and the peak accelerations at the top of building are presented in this paper. Compared with the experimental results, one case is considered as the optimal case for structural design.
The Innovation of Knowledge Service for Network-Based Engineering Consulting Industry in China
Authors: Zhao Yu Xiang , Hao Sheng Yue
Published: August 2011

With the sustainable development of China's economy, the engineering consulting industry plays an important role in various types of construction, in particularly in the huge construction projects. The purpose of the paper is to research the innovation of knowledge service for network-based engineering consulting industry. With the method of combining theory with practice and the application of connecting advance with feasibility, the situations and challenges of the network-based engineering consulting industry are introduced in this paper. What is more, the development strategy in the innovation of knowledge service for network-based engineering consulting industry is summed up, which can provide supports to adapt to the new situations for the engineering consulting industry.
Structural Morphology Design of Muping Sports Center Based on Bionics and Digital Technology
Authors: Su Chao Hao , Xiang Ke
Published: August 2011

Based on bionics and digital technology, the efficient methods to create and control architectural bionic forms through parametric technology are discussed. The harmonic integration of morphological bionics with mechanical logics in the digital space, is considered as the key point in structural morphological design with the structural mechanics theory.
Construction Site Safety Control by ACO Model
Authors: Yang Qing , Liu Wen Han , Ning Xin
Published: August 2011

Good construction site safety control lead to successful project management, while, the layout of a construction site plays a major role in the safety. The paper aims to reduce the likelihood of accident happened by optimization construction site layout via ant colony optimization (ACO) model. A case of residence building was used to evaluate proposed ACO model. The results showed that the feasibility and effectiveness of the proposed ACO model.
Development and Validation of Mathematical Model for Tailrace Tunnel Ventilating Process in Hydropower Station
Authors: Yu Yan Shun , Qian Pu Hua , Zhang Shao Fan
Published: August 2011

When outdoor air flowing through the tailrace tunnel, it will be handled and its thermodynamic conditions will change under the differences of temperature and water vapor pressure between air and water surface, air and tunnel wall. Utilizing the handled air for space cooling in hydropower station is an energy saving, environmental protection and renewable application of natural cold source. In this paper, a detailed quasi-three-dimensional mathematical model of heat and moisture transfer of tailrace tunnel ventilating was developed and validated against the field test data from Yingxiuwan hydropower station, and the validation shows that the model predicts the test results very well. The model can be used to predict the heat and moisture performance of tailrace tunnel ventilating system.
Research on Product Oil Distribution Logistics Vehicle Configuration
Authors: Zhu Min Jie , Zhang Jian Wei , Bao Sheng Hua
Published: August 2011

There is he bigeer product oil distribution district and the more complex distribution goods, a wide variety, quantity, and so on. Vehicle is a necessary factor about product oil logistics distribution , and reasonable vehicle configurations on logistics distribution and service level will have direct influence. The research of the vehicles in product oil logistics and distribution is Combined with product logistics distribution and logistics service system of allocation problem. Through the research we can draw reasonable vehicle configuration. It can improve service quality, meet customer needs , reduce distribution costs and improve the competitiveness of enterprises. The research provide decision support for oil distribution center vehicles allocation problems.
A Study on Transport Monitoring and Emergency Rescue Management System of Dangerous Goods
Authors: Chen Yong Guang , Wang Qing Juan , Yan Li Yong , Cai Wei Ming
Published: August 2011

The accidents such as explosion, leakage, poisoning and fire happened constantly in dangerous goods' transportation. The consequences of the accidents are serious. This article has statistically analyzed 485 transportation accidents of dangerous goods. It shows that the main reason causing dangerous goods accidents is road traffic accidents. The key to ensure the seasonable rescue is effective visual monitor using GPS, modern communication technology, GIS to dangerous goods transport vehicles. So we construct the transportation monitoring system. When the accident inevitably occurs, we propose the rescue mission and response program. Only effective monitoring and timely rescue, can we reduce the rate of accidents and ensure our safety.
Field Monitoring of PM10 Dispersion at Street-Canyon Road Intersection
Authors: Xiong Sheng Yi , Zhang Hong Yan , Jiao Li Hui , Zhang Yao
Published: August 2011

In order to research the harm of particle matter to human health, the TSI dust instrument, particle counter and miniature meteorological instrument were used in this paper to monitor the PM10 concentration of one typical cross road in Xi’an city. The affect factors of the PM10 concentration were also discussed. The results provided that: there is weak linear relationship between sample concentration of PM10 and wind velocity because of the complex shape of the buildings. The fine particles (<1.0μm) mainly come from vehicle emission in the cross road,and the sample concentration of PM10 has a significant relationship with the fine particles under high humidity conditions, while it has weak correlation with traffic flow. The fine particles from vehicle emission and the high humidity condition is the primary cause of the high PM10 concentration, while the temperature and airflow caused by the building shape affect the diffusion and distribution of the PM10.
Backfilling Filter Deployment for Groundwater Monitoring Well
Authors: Hong Yao Ming , Lin Hsueh Chun , Kan Yao Chiang
Published: August 2011

This study composed the well-known criteria to design the grain size distribution of backfilling filter for groundwater monitoring well (GMW) under the sand and gravel layer. With an assumption of linear logarithmic scale distribution from D10to D90, the coefficient of uniformity Cucan be formulated for D10, D60, and D90corresponding to D15. Then, D0and D100can be obtained by linearity relationship. The method of backfilling filter deployment was then demonstrated by a practical application, which validates the procedures of existing filter design.
The Fuzzy Comprehensive Evaluation of Hydropower Plant Production and Operating Conditions Based on the BP Neural Network Improved
Authors: Liu Shu Liang , Song Yun Xia , Hao Peng Liang
Published: August 2011

With the rapid economic growth, the resources and environment condition gradually tightens. We need to accelerate the development of hydropower resources. The electric power produced by the hydropower plants is a kind of green power energy. The quality analysis of hydropower production operation condition will become the focus of our researching. In paper we construct a reasonable set of evaluating indicator system of hydropower production operation and have used the BP neural network and fuzzy quality synthetic to analyze the production and operation condition of several hydropower plants. Help hydropower to summarize experience.