bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Geological Disaster Information System Based on Skyline
Authors: Xu Fei Fei , Liu Tie Ping , Zhang Ye Ming
Published: October 2012

The Wudongde reservoir area 3D visualization geological disaster information system is designed in this paper, based on the superiority of Skyline software and Skyline TerraExplorer API. It consists of two parts: retrieval browsing system and spatial analysis system. Retrieval browsing system has several functions, such as displaying, browsing, information retrieval, data statistics, querying, searching and printing. Spatial analysis system sets the core modules, including spatial calculation, terrain analysis and flood-inundated simulation. It is verified by application that this system can be used for displaying 3D scene of the Wudongde reservoir area terrain, providing decision support for the governor, reaching the design requirements wholly.
Study on Interpretation of Landslides Based on Gis — Taking New Fengjie County in Chongqing as an Example
Authors: Yang Le , Lu Rui Na , Tan De Jun , Xie Hong Bin , Luo Zhen Fu
Published: October 2012

The paper chooses new Fengjie county with the area of 66.90 km2 as research region to interpret landslide that picked with the proportion of 1/1000 by remote sense technique. Interpretation results of landslide are basically consistent with the results of field survey. It proves that the remote sensing technology in the landslide investigation is feasible and effective,which have strong practicability and guidanciality to engineering construction of the three Gorges Reservoir.
Study on Hazard Analysis Method of Earthquake Secondary Fire Disaster in Urban Area Based on GIS
Authors: Li Tian Qi , Geng Fei
Published: October 2012

In order to study the probability of occurrence of secondary fire after the earthquake in urban areas, the probability model of the hazard analysis that the fire occurred and the spread is established and applied. Probability models need to consider the destruction level of buildings under earthquake excitation as well as the probability of the leakage and diffusion of combustible material in the buildings in the corresponding destruction level, combination of weather, season, housing density and other factors to determine the probability of the single building earthquake secondary fire. On this basis , the natural administrative areas in the city as a unit , considering the factors of regional hazard analysis such as population density , property distribution and density within a region , to calculate the hazard indicator and determine the high hazard areas of secondary fire in the city. The Geographic Information System was used as the platform, to division of urban earthquake secondary fire high-hazard areas.
Lessons Learned From Major Environmental Accidents and Regulations on Hazard Control in China
Authors: Xue Peng Li , Sun Xiao Feng , Song Yun , Cheng Yan Jun , Sun De Zhi
Published: October 2012

China is suffering from severe environmental accidents that many have catastrophic impacts on public health and the environment. It is urgent to update the standards for environmental accidents prevention in China. This paper analyses the causes of fifty-three major accidents that happened in 2008 to obtain insight to help prevent similar events in the future. The results show that production accidents, which were mainly triggered by process analysis, training and human error, were the dominant causes of environmental accidents in China. In addition, current regulations on the control of environmental accident hazards and their implementation are also presented in this paper, which comprise legal requirements centering on hazardous chemicals, industrial safety evaluation, risk analysis and preparation of emergency plans. Based on our analysis, some key points that should be developed in future environmental accident hazard control measures are put forward with the aim of shedding light on decision making and risk management in China.
The Application of Gas Drainage Technology in the Workface of "Three Soft" Specially Thick Coal Seam
Authors: Lu Guo Liang , Wang Chen , Jiang Yao Dong , Wang Hong Wei
Published: October 2012

In order to improve the gas drainage effect of "three soft" coal seam with low-permeability and eliminate the gas overrun in the upper corner and return air during the production process, this paper did an exploration on the comprehensive gas management on the fully mechanized caving face of gassy mines in Xuangang mine area and its application achieved a good result.
Dynamic Responses of Buried Pipelines Under Impact Loading Caused by Landslide
Authors: Zhu Xiu Xing , Xue Shi Feng , Tong Xing Hua , Liu Chuan Qi
Published: October 2012

Cases of pipeline damage caused by landslide are common in coastal or mountainous regions, where the design of buried pipelines should be improved in order to reduce the risk of damage or failure. Dynamic responses of large diameter thin wall steel pipes under impact loading were analyzed using a nonlinear contact model of pipe-soil coupling in this paper. Several influence factors were studied, such as the impact velocity of rockfall, buried depth of pipeline, ratio of diameter to thickness and style of soil. The results show that an ellipsoid induces much more impact force than a sphere which has the same volume, and the larger one in volume have greater impact force for two spheres. Dangerous compressive areas of pipeline occupy 1/6 of the whole area, so the pipelines subject to landslide occur local failure. Based on results, some useful suggestions for the design of pipelines in landslide region are given
Study on Early Warning of Slope Safety Based on Field Monitoring
Authors: Sun Jian Hui , Jiang Long , Wang Wan Shun
Published: October 2012

The paper has systematically studied stability, deformation property and early warning of high engineering slope in depth, and established the early-warning monitoring system of slope. The results show that: ① The time of displacement deformation is more consistent with the slope treatment, as well as the position of dislocation more consistent with geological conditions, and displacement deformation is less below the position and basically unchanged below a certain depth. ② Lateral deformation increases with increasing reduction factor. Lateral deformation has smaller increment with smaller strength reduction factor, and has a larger increment with larger strength reduction factor. ③ The early-warning monitoring system of slope safety based on deformation amount and safety factor is established.
A New Method of Simulating Arbitrary Slip Surface in Soil Slope
Authors: Zhou Yuan Wu , Cai Xue Ji , Chen Jin Biao
Published: October 2012

The paper proposed a simulating arbitrary slip surface method. For simulating slip surface, select 7 control points, then connect to broken line which is assumed slip surface. Horizontal spacing between 7 control points is not equal, the spacing is arbitrary. Horizontal spacing of general simulating slip surface method is equal. So the proposed method is closer to the actual. For search method, particle swarm algorithm is not easy to fall into local minima, as a global intelligent optimization method, particle swarm algorithm is suitable for search the most dangerous slip surface. Based Janbu method, the paper computed two examples for simple slope and complex slope. The results show that the proposed method is effective.
Discussion on Construction of Control System of Environmental Risk Source for Expressway Transportation Accidents of Dangerous Chemicals in Water Environmental Sensitive Areas
Authors: Shao She Gang , Shen Yi , Yu Wen Sheng , Fu Ke Jian , Yan Shao Yang
Published: October 2012

Based on the analysis of the environmental risk characteristics of freeway dangerous chemicals transportation accidents, the environmental risk source control system, which combined the initiative prevention system and passive protection system, are proposed, and the relative subsystems are also elaborated in this article. The risk sources information transfer subsystem is composed by the security regulation platform of regional dangerous goods transportation and highway monitoring and communication system, and the function of the subsystem is transferring the public information between the highway and regional dangerous goods transportation security supervisory. Environmental risk sources prevention subsystem is comprised by the main engineering structures and traffic safety facilities, and the services of environmental accident risk defending platform, which composed by the runoff gathering facilities and reservoir.
GPS Monitoring and Warning on Bazimen Landslide
Authors: Wang Neng Yong , Wu Jian , Xia Lang , Zhao Jin Bao
Published: October 2012

Our country is one of the countries that with serious geological disasters,every year we loss nearly twenty billion yuan and hundreds of people dead because of it. Bazimen landslide is one of them.Based on the research of Engineering geological characteristics，formation mechanism，failure mode and later change trend of Zigui county Bazimen landslide in Three gorges reservoir area,we put forward the warning construction scheme of landslide monitoring, introduce the layout of monitoring network and the construction technical requirements of all kinds of deformation monitoring,it can be refered to by other landslide monitoring projects.
Analysis of the Bond Strength Influence to the Impact Force of Landslip-Collapse Soil
Authors: Ji Xian Jun , Ou Guo Qiang , Yang Shun , Wang Jun
Published: October 2012

The bond strength between particles influences the impact process of the landslip-collapse soil and the impact forms to the monitor wall. The first time of impact force to the monitor wall is same basically since the landslip-collapse soil moves along slope from the same position, but there is some difference since the difference of the bond strength between particles. The starting time of continue impacting to the monitor wall is delayed with the increating of the bond strength, but which is bring forward when the bond strength over 103kPa. The max impact force increases with the bond strength increasing.
Preliminary Research on Design Method of Sustainable & Open Residence
Authors: Tan Zheng , Wang Ai Feng
Published: October 2012

The residential building is a critical factor to reflect the relations between human and natural environment, and it is required that the residential design is more flexible, healthier and more environmentally friendly and is capable of fully responding to the demands and changes in family life and harmonizing with the environment, as the time goes on and progresses, the concept of “Sustainable & Open Residence” (SOR) has been promoted and applied by many countries, also attracted considerable attentions in the process of the China's Housing Industrialization. The paper discusses how to achieve such the “Sustainability” and “Open” in residential design based on the author’s understanding on SOR under the current conditions in China, a architect should take the initiative to adopt a number of architectural design method to achieve the sustainability and open in residential building design.
Transformation on the Design for Sustainable of High-Rise Residential Buildings – The Case Study of Shanghai Combined Apartment Building
Authors: Ngo Le Minh , Li Zhen Yu
Published: October 2012

In the recent years, the design for high-rise residential buildings in Shanghai has been changing in floor plan. It is the transformation in the shape of the house from residential tower-shaped buildings into combined apartment buildings; the transformation in constitution of floor plan, the number of apartment in each floor; the transformation in area and function of each apartment and even in living habits. Studies of the transformation in shape mentioned above were carried out by the morphology methodology. Combined apartment buildings in Shanghai combined together leads to high economic benefit, and the number of floors is up to 34 floors. Auxiliary area which is shared equally to each apartment, accounts for an approximately large portion of a typical floor plan. Each apartment in Shanghai must be added 12-18% of external auxiliary area. The cause and effect of the transformation in the design for high-rise apartment buildings are valuable experiences for other developing metropolitans in China, so as other countries in region.
Expansive Soil Damage to Buildings and the Treatment Methods in Jijie
Authors: Gong Han Mei , Liu Wen Lian , Dong Feng Qiang , Li Xin
Published: October 2012

By means of field sampling , laboratory test , field survey and data collection methods. The characteristics of expansive soil were studied. After analyzing the reasons for deformation and failure of expansive soil to buildings, effective treatment methods were put forward. Under the extreme drought climate condition, the buried depth of the foundation should be appropriately increased.
Cement Hydration Models Research Based on Composition Content of each Phase of Minerals
Authors: Rao Chun Hua , Wu Lang , Lei Bin
Published: October 2012

Abstract: Based on the cement hydration kinetics model proposed by R.Berliner, taking into account the factors such as each chemical phase of minerals, curing temperature, water-cement ratio, the final hydration degree and fineness of cement, a theoretical hydration kinetics equations was established in this paper. It can be used to predict the hydration rate and the change of hydration degree.
Study on Influence of Composite Ultra-Fine Fly Ash on Crack Resistance of Pavement Concrete
Authors: Qin Qi Tao , Li Yi Jin
Published: October 2012

The crack resistance evaluation indexes of concrete were chosen, which were used to study the influence of ultra-fine fly ash on the crack resistance of pavement concrete. The concrete flat test was made to testify the concluded law. The test results show that composite ultra-fine fly ash improves the crack resistance of pavement concrete. The main reason is that it reduces the elastic modulus and drying shrinkage of concrete and improves the ultimate tensile deformation capacity.
Finite Analysis on Performance of Joint between Gangue Concrete Filled Steel Tubular Column with through Rebar and Gangue Concrete Beam under the Monotonic Loading
Authors: Li Guo Chang , Fang Chen , Yu Hong Ping
Published: October 2012

In order to study the performance of the joint between gangue concrete filled steel tubular column with through rebar and gangue concrete beam under the monotonic loading, element analysis model, which is taken into consideration the material nonlinearity, the geometrical nonlinearity and the contact nonlinearity, is established by finite element analysis software ABAQUS. The results show the force transferring mechanism, the stress distribution, the failure model and the load-displacement curve of the joint under the monotonic loading. It indicates in this paper that the joint between gangue concrete filled steel tubular column with through rebar and gangue concrete beam has such numerous advantages as high bearing capacity, large stiffness and good performance. Meanwhile, the paper provides the calculation evidences to analyze the composite construction of gangue concrete filled steel tubular column and the results can be used to make the analysis on the practical structures.
Influence of Sulfate Attack and Drying-Wetting Cycle on Properties of Mortar
Authors: Chen Da , Wang Na , Jiang Chao Hua
Published: October 2012

This paper presents the study on mortar specimens exposed to three kinds of Na2SO4 solution(0.5%,5%and10%)and different drying-wetting cycles(20,30,40and75). Influence of cycle number and solution concentration on mechanical behavior, mass and appearance of mortar specimen was analysis. The results show that surface of specimen in 5% and 10% solution shows obvious desizing, sandiness and some crack at 75 drying-wetting cycles. In different solution concentration, mass of specimen shows a trend to increase firstly then decrease lately. The increasing and declining separately of specimen mass are more obvious in high concentration solution. In three kinds concentration of solution, peak stress and modulus of elasticity of specimen show the same trend to increase in early erosion stage and decrease in late erosion stage. Change rate of mechanical behavior of specimen in high concentration solution is larger than that of in low concentration solution at early and later stage separately. On the contrary, peak strain show a trend to decline firstly then increase lately.
Rutting Resistance Property of Warm Recycled Asphalt Mixture
Authors: Yang Li Ying , Tan Yi Qiu , Dong Yu Ming , Li En Guang
Published: October 2012

Warm recycled asphalt mixture can reuse the waste asphalt mixture via warm technology. In this paper, the waste mixture was reclaimed and analyzed. Warm recyclings with different propotion of reclaimed mixtures were designed. With the standard rutting test and Hamburg rutting test, the hot temperature stability of the warm recycling was evaluated. Conclusions on rutting resistance stability of warm recycling are drawn.
The Influence of KCl on the Performance of Oil Well Cement Slurry
Authors: Cheng Xiao Wei , Huang Sheng , Yang Yuan Yi , Li Zao Yuan , Guo Xiao Yang
Published: October 2012

The influences of KCl on the performance of G-Grade oil-well cement are discussed in this article. The macro performances including the rheological property, filter loss of slurry and the thickening time, strength and shrinkage of cement are tested. And the reasons why those influence could happen are explained by analyzing the microscopic structure of the cement. The results show that: KCl takes participation in hydration reaction of cement, KAlSiO3 and Ca4Al2H0.34O6.34Cl1.67 are generated in the reaction that could improve the compressive strength of the cement and reduce the shrinkage of the cement, but there is a limited added amount, less than 12% (BWOW) is the best.
New Advance of the Rheological Properties Test of Fresh Self-Compacting Concrete Based on V-Funnel
Authors: Wu Xian Lei , Shi Jian Jun , Shan Zhi
Published: October 2012

This template is mainly about the analysis of mechanical property of SCC in a flow state in the V-Funnel. It aims to establish the testing formula of rheological constants by Engineering Fluid Mechanics, which can provide academic basis for V-Funnel test of SCC properties. MATLAB image process technique was introduced in the process which can greatly improve its precision and reliability. It can also provide a new train of thought to experimental data.
Study on Dynamic Performance of Silica Fume Concrete
Authors: Wu Wei , Zhang Chao , Wu Kai Hang
Published: October 2012

Do static load compression tests and dynamic impact tests on concrete specimens containing different silica fume contents with universal testing machine and SHPB experiment device to study strength mechanism of silica fume concrete. The results show that silica fume can significantly improve compressive strength of concrete. The best content is 16% and its impact resistance increases by 27% compared with plain concrete.
Application of Epoxy Resin Concrete in Covers
Authors: Jin Yu Jie , Yin Xin Sheng , Xiao Li Guang
Published: October 2012

In this paper,it discusses the application of epoxy resin concrete,introduces the ultimate bearing capacity of covers of epoxy resin concrete and analysis of capacity theory and experiment result on covers of epoxy resin concrete.High performance polymer concrete is used to make the manhole cover instead of iron’s nowadays,and the paper analyzes the theory and test results of epoxy resin concrete,the performance of epoxy resin concrete is superior in fact,this kind of covers is the thinnest in all the covers.
Effects of RE on Inclusions and Mechanical Properties of Weathering Steel
Authors: Liu Xiao , Zhang Hu Fei
Published: October 2012

The effects of RE on the inclusions and the mechanical properties of 10PCuRE steel were studied. The results show that the morphologies and sizes of inclusions in 10PCuRE steel are changed, and RE played a very good role of modifying inclusions. Fracture is changed from cleavage to ductile fracture by adding RE to 10PCuRE steel. And the mechanical properties of 10PCuRE are improved. In comparison with 10PCuRE steel without RE, the transverse impact toughness of 10PCuRE steel with RE is increased 30.15% at -20°C, and the tensile strength and reduction of area have been improved 27.14%, 8.9%, respectively.
Research on Mechanical Properties of Solidification Agent Stabilized Iron Tailing Gravel
Authors: Yin Song , Xiao Chang Li , Yue Jin Chao
Published: October 2012

Based on the method in Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering, the unconfined compressive strength, the splitting strength and the resilient modulus were tested to research the mechanical properties of solidification agent stabilized iron tailing gravel. Meanwhile the influences of solidification agent content and curing age on the mechanical properties of solidification agent stabilized iron tailing gravel were investigated. The results show that solidification agent stabilized iron tailing gravel has better mechanical properties. The mechanical properties of solidification agent stabilized iron tailing gravel conform to the current specification, so it can be used as highway sub-base material.
Application of Prepacked Aggregate Concrete Technology in Gravity Wharf Reinforcement
Authors: Li Shu Min , Chen Ting Guo , Wang Ke , Ma Gao Feng
Published: October 2012

To improve the production capacity, a special area of the wharf’s working face is needed for production and shipment at the construction field of Offshore Oil Engineering (Qingdao, China) Co., Ltd. However, the load acted on the working face increases too much and the bearing capacity of the wharf structure is insufficient. In comprehensive consideration of the construction quantity, period and cost, and to make full use of the present structure, the prepacked aggregate concrete technology is applied to reinforce the rubble-mound foundation and the caissons. With significant improving of the load-carrying capacity, the wharf is available for the new production process. The practical application shows that the technology can be applied to the reinforcement of the gravity wharf. And for very good effect and lots of advantages, it is worth to be widely applied.
Synthesis and Characterization of SrSiO3 by Chemical Deposition Method
Authors: Zhang Zheng Quan , Wang Yu Ling , Yue Xiao An , Wang En Ze , Zou Li Zhen
Published: October 2012

Nitric acid strontium and potassium silicate as raw material, the strontium silicate was synthesized preparation the strontium silicate was synthesized by chemical deposition method， and the strontium silicate was sintered for three hours in 850 °C, 1000 °C and 1150 °C. The effect of sintering temperature on phase composition, microstructure and the influence of purity of strontium silicate was studied using X-ray diffraction and electron scanning electron microscope and differential thermal-hot heavy analyzer. The formation mechanism of strontium silicate by chemical deposition method was analyzed. The results show that: the sintering temperature is effect on phase composition and microstructure of the strontium silicate, Compared with traditional high temperature solid reaction process, the chemical deposition method could greatly reduce the sintering temperature, and improve the powder purity.
Study on Horizontal Wells and ERW Drilling Technology of Carrying Cuttings
Authors: Ma Cha , Li Long , Yang Yu Ping
Published: October 2012

Hole cleaning was very difficult in horizontal wells and extended reach wells (ERW), which was the technical bottleneck in raising the progress and success rate of petroleum exploration and production at present. A new type of treating agent for drilling fluid (CNRJ), designed for horizontal wells and extended-reach wells, was synthesized. CNRJ was added to drilling fluids, and the rheological properties, temperature-resisting property and suspension performance of drilling fluid system were analysed. The results indicate that CNRJ has good compatibility with drilling fluid system, and the dynamic plastic ratio of drilling fluid system can be adjusted from 0.20 to 1.12. In addition, the drilling fluid system has good static suspension ability for cuttings, good heat resistance and pollution resistance.
Fabrication and Study of Abandoned Glass Fiber/Polypropylene Flame-Retardant Fiberboard
Authors: Lv Li Hua , Zuo Min , Su Xing Gen
Published: October 2012

In this paper, flame-retardant fiberboard was prepared by blend mastication and hot-pressing method, using abandoned glass fiber and polypropylene as raw materials and magnesium hydroxide as flame-retardant reagent. The optimized processing conditions were concluded through orthogonal experiment and the range analysis: magnesium hydroxide mass fraction 25% , polypropylene mass fraction 70% , hot-pressing temperature 180, hot-pressing pressure 10 Mpa. Under these conditions, properties of fiberboard were as follow: tensile strength 20.55 Mpa , bending strength 30.98 Mpa , impact strength 3.65 Mpa , limiting oxygen index 28.2%.
Thermal Properties and Morphology of Electrospun PEG/PVP Composite Fibers as Novel Phase Change Materials
Authors: Shi Qi Song
Published: October 2012

The ultrafine fibers based on the composites of polyethylene glycol(PEG) and polyvinylpyrrolidone(PVP) were prepared successfully via electrospinning as phase change materials. The thermal properties and morphology of the composite fibers were studied by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM), respectively.
Durability of Cement Mortar with Surface Treated by Superabsorbent Resin Synthesized In Situ
Authors: Zhang Dan , Song Xue Feng , He Ting Shu
Published: October 2012

The deterioration of concrete durability seriously affects utilization and lifespan of concrete constructions. This paper presented a novel method to improve concrete durability by synthesizing Super-absorbent Resins (SAR) in micro-cracks or capillary-pores of concrete, i.e., the synthesized SAR swell after absorbing water, fill micro-cracks or capillary-pores and prevent water penetration into concrete. The main performance of impermeability, freeze resistance and sulfate resistance related to concrete durability were studied. The results show that the impermeability, freeze resistance and sulfate corrosion resistance of cement mortar handled by SAR are obviously better than cement mortar unhandled by SAR.
Development of the Propertie and Process of Slot Wedge Cunibezrsi Copper Alloy Heat-Treatment Strengthening
Authors: Li Hui , Ma Ze Bang , Bu Fu Xing , Li Tian Xing
Published: October 2012

Strengthening process tests were carried out on the CuNiBeZrSi alloy used for slot wedge in turbo-generator rotor. By EM, XRD anasys ，The results show that: in this experimental conditions, to obtain better overall performance, the heat treatment process of slot wedges copper alloy is: forging - water quenching solution-aging. CuNiBeZrSi alloy got a better overall performance after solid solution 950°C×1.5h+460°C×3h aging. And the values of hardness and electrical conductivity of the alloy are HB 259 and 56 %IACS. It can meet the requirement of slot wedge copper alloy working, with better economic benefits.
The Use of Nanosilica for Improving of Concrete Compressive Strength and Durability
Authors: Bi Jon , Pane Ivindra , Hariandja Binsar , Imran Iswandi
Published: October 2012

The development of construction materials technology, particularly concrete is growing very rapidly in the presence of nanotechnology. One material that deserves the attention of researchers is nanosilica. Silica has been used on concrete, starting from silica sand as a filler to microsilica (silica fume) as a reactive pozzolan. Based on previous research, silica fume is proven effective to improve the mechanical properties and durability of concrete. A novel nanotechnological process allows producing amorphous nanosilica with high reactivity from locally available silica sand. In this study a locally available nanosilica is used on mortar and concrete thereby limiting the use of commercial nanosilica materials from semiconductor industry waste. To obtain sustainable concrete, the mix is design to have high strength as well as low permeability using as much possible local sources. This study also make use of commercial, regular silica fume combined with the locally produced nanosilica. The results show that combined use of nanosilica with silica fume can increase the compressive strength and durability.
A Review of Smart Material and Vibration Control for Civil Engineering Structure
Authors: Qin Li Ping , Yan Yuan Jun
Published: October 2012

Intelligent control for structural vibration is the international research frontiers in vibration control. The intelligent material and intelligent adjustable dampers and smart material actuator has the advantages of simple structure, easy adjustment, small energy consumption, driving the rapid response, almost without delay, in active structural control, semi-active control and passive control, has broad application prospects. The actuator is setted on the structure as a control mechanism, the control mechanism and the structure resist the vibration dynamic loads together, reduce the dynamic response of structure, improve the shock resistance performance of the structure.
Finite Element Study on Influence of Ring Beam at Top Window Sill Elevation on Temperature Effect of Masonry
Authors: Yang Wei Jun , Guo Ning , Zhang Hai Dian
Published: October 2012

This paper mainly studies on the problem of the temperature cracks of the concrete perforated brick masonry structure by finite element model simulation and the stress distribution of masonry at the top window sill elevation under temperature difference effect. Analysis the influence of setting ring beam at the top window sill elevation on temperature stress of masonry, Summed up some measures about control and prevention of masonry temperature cracks at the top window sill elevation, it can be referenced for concrete perforated brick masonry structure design and construction.
Analysis of New Construction Materials and its Development
Authors: Wang Bo , Cheng Ji , Zhang Xiao Han
Published: October 2012

New construction materials are the new generations of construction materials which are on the basis of the traditional construction materials, including the new wall materials, thermal insulation materials, water sealing materials, decoration materials and etc. New construction materials industry is developed with the deeply reforming and opening of China. This paper introduces the basic concepts and characters of the new construction materials, analyzes the development and application of the new construction materials, and then discusses countermeasures and suggestions of the development of the new construction materials.
The Properties and Influence of Dirt Band during the Fully Mechanized Top Coal Caving in Thick Coal Seams
Authors: Shen Jie , Pan Wei Dong , Lin Li , Li Xiao Meng , Fan Lu Jia
Published: October 2012

In the coal mine of Huaibei Mining Area, based on the character of thick dirt band in the coal seams and the influences to top coal caving, the physical and mechanical properties of dirt band were analyzed. In order to improve the recovery rate of top coal, the failure mechanism of dirt band was analyzed through the cantilever beam model, and the sensitivity analysis to the length of dirt band overhang was done in the conditions of different mining height and dirt band thickness. The results show that, the average water absorption of dirt band samples is 3.5%, and the soften coefficient is 0.71, which presents that the dirt band have large softening property and poor engineering geological property. When the thickness of dirt band was more than 3.5 m, the top coal could not be caved smoothly. However, the bigger underground pressure would be helpful to the broken of dirt band and top coal seams, and the recovery rate of top coal was improved.
Synthesis and Performance Research of Ester Polycarboxylate Superplasticizer
Authors: Chen Xiao Lu , Fang Yun Hui , Lan Zi Dong , Jiang Zhuo Jun , Ke Yu Liang , Guan Meng Qin
Published: October 2012

Using methoxy polyethylene glycol methacrylate (MPEGMA), butyl acrylate (BA), Methyl allyl sulfonate (SMAS) as the raw materials, we can compose them to multipolymer in redox system. Through analyzing the factors and adjustment of orthogonal experimental results, the optimum technology of synthesis are shown as follows: n(MPEGMA):n(BA):n(SMAS)=5:12:2, n(H2O2)/n(Vc)=6, and the reaction temperature is 30°C. When the volume of superplasticizer is 0.42%, water cement ratio is 0.3; the initial fluidity of cement paste can get to 238mm, and within 1 hour without any loss.
Effect of Fly Ash on Thermal and Mechanical Properties of Expanded Perlite Insulation Product
Authors: Li Zhan Bing , Wu Xiu Wen , Chen Xiao Chao
Published: October 2012

Expanded perlite insulation samples were prepared with expanded perlite as aggregate, aluminum dihydrogen phosphate as binder and fly ash as addition by mixing, molding, drying and calcination. The effects of fly ash mass percentage on the compressive strength, thermal conductivity, moisture content and density of the samples were studied. The results indicated that the combination properties of adding 10 % fly ash were the best among the all samples according to the national standards (GB/T10303-2001) No 350 Qualified of expanded perlite insulation products. Its compressive strength, thermal conductivity, moisture content and density were 0.456 Mpa, 0.08165 W/ (m K), 0.02 mass % and 259 kg/m3, respectively.
Innovative Use of Wood Materials in Modern Home Design
Authors: Gui Qiao Ling , Su Feng , Hu Rui Bo , Liu Xiao Yan
Published: October 2012

Under the premise of human-oriented design philosophy and sustainable development, wood is widely used in home decoration industry both home and abroad. The applications of wood not only meet the needs of different people’s requirement in style but have played a basic role in tracing the origin of the ecological and environmental protection as well. The innovative thinking of the usage of wood in home design brings its unique material properties into play and reflects its humane features and returning-to-nature eco-consciousness. This paper is to elaborate utilizing wood into its utmost property. Through introducing the innovative use of the combination among wood, new materials and modern technology, the paper advocates to maximize the practical value, aesthetic value and the technical beauty of the timber so as to bring about the needs of many usages of wood.
Study on Influence Factors of Rubber Concrete Compressive Strength
Authors: Wu Wei , Zhang Chao , Li Yong
Published: October 2012

Rubber is mixed into concrete replacing sand, gravel and both sand and gravel with the same volume. Test compressive strength change trend of 7d and 28d concrete mixed into different volume rubber of 20 mesh, 40 mesh, 60 mesh and 80 mesh and study influence of different way, powder size and dosage on rubber concrete compressive strength. The results show that tenacity, cracking resistance and failure characters of rubber concrete are significantly better than that of ordinary concrete and that compressive strength of rubber concrete declines with increase of rubber dosage.
Test Analysis of Groundwater Withdrawal and Land Subsidence in Tianjin Airport Project
Authors: Xiong Chun Bao , Xiao Mei Jiao , Shi Xiao Rui
Published: October 2012

The pumping tests on the hydrogeology, including single well tests, group wells tests and land subsidence analysis, were carried out for Tianjin transportation center project. The straight-line graphical method, curve fitting method, formula method and infiltration curve extrapolation method were applied to obtain the permeability coefficients and influence radius of the main aquifers, and to obtain the mutual influence between the aquifers. The results of the land subsidence observations indicate that amount of land subsidence decreases with increasing distance from the wells. And it is also found the land subsidence of a band range is obvious, and its distribution changes unregulated. It could be preliminarily inferred that this anomaly is due to the venue internal west alkali river that has been recently backfilled.
Preparation and Properties of Microencapsulated Phase Change Materials
Authors: Liu Tai Qi , Yang Li Yan , Ma Fu Rui , Liu Rui Xue , Wen Yu Quan , Wu Xiao
Published: October 2012

Microencapsulated phase change materials were prepared by the interfacial polymerization method with polyurethane resin as the shell and disodium hydrogen phosphate dodecahydrate as the core. The factors which affect the diameter distribution, surface morphology and thermal properties of microencapsules were investigated by the means of SEM, DSC and TG. The results show that the diameter distribution is uniform and the microencapsules have high compactness. The particle size is centralize with the stirring rate of 8000r/m and emulsifying time for 30 minutes. The DSC results show that the melting point of the phase change material does not have much change and phase change thermal storage is obvious
Experimental Study of the Effect of Different Well Flow Quota on Groundwater Thermal Flow Transport Variation
Authors: Zhou Xue Zhi , Gao Qing , Ma Chun Qiang , Zhao Xiao Wen
Published: October 2012

In earth energy utilization, different multi-well flow match modes determine the different groundwater thermal flow transport characteristic. In this study, a laboratory experimental system was designed and set up to study the aquifer heat transfer performance and temperature field variation in different multi-well flow match modes. The experimental results show that under the condition of certain total flow rate, different multi-well flow match modes have great effects on the change of groundwater seepage field and temperature field. The bigger the flow rate, the greater the heat transfer per unit time and temperature field variation, and the closer the occurrence time between cold water frontal and cold water effect frontal, which is not conducive to the active control of aquifer temperature field.
New City Gas Leak Detection Method and its Application
Authors: Wu Xiao Nan , Hu Mei Lin , Shang Bo Jun , Xian Yan
Published: October 2012

In city gas leak detection, common methane detector is vulnerable to gases such as CO, CO2,H 2O and actual conditions of interference (such as humidity, coverings and wind direction), causing false detections and failure judgment. we put the optimization of optical methane detector with infrared absorption principle to replace the traditional combustible gas detector. In order to improve accuracy and efficiency of the gas leak detection, we put forward vehicle-mounted OMDTM optical methane detectors and complementary methane portable RMLDTM laser distance measuring instrument using a new method for gas leak detection. This method is effective to exclude other combustible gases such as methane to leak detection of interference effects, it not only covers the whole of the city gas network, proactively preventing leakage accidents from happening. In the leaks rescue operation, with it, testing vehicles can quickly arrive at the scene to participate to find the leaks, and deal with the leaks as soon as possible. Engineering field application effect suggests that the gas leak detection accuracy rate is higher, low false positive rates, fast response, and it meets the needs of modern urban gas leak detection.
Simulation of Transient Heat Transfer Based on Element-Free Galerkin Method and Increment-Dimensional Precise Integration Method
Authors: Mei Fu Liang , Li Gui Ling
Published: October 2012

There were many issues in numerical methods of heat transfer problems such as instability at a big time step length or grid size and no-existence of inverse matrix by time-precise integration method. For sake of avoiding instability and calculating an inverse matrix, a coupling method was put forward based on EFGM and IDPIM. Formulae were deduced according to EFGM and IDPIM. Results show that the coupling method has a higher accuracy and its stability is small subjected to the time step length or grid size, and is to deserve to be popularized.
Modeling and Simulation of Chilled Water System for Central Air Conditioning
Authors: Sun Jian Min , Zhang Chun Dong , Zhou Ze Yang
Published: October 2012

Considering the central air conditioning system is highly susceptible to interferences from external environment, this paper established a dynamic mathematical model for chilled water system with the air conditioning area, fan coil unit and air conditioning area interference factors. Selection of chilled water system as a controlled object, designed the energy saving control system for central air-conditioning. The inputs of PID controller are deviation of actual temperature and setting temperature, and the change rate of the deviation; output is operation frequency of pump. Experiment shows that, PID control system in 90% time operating at a frequency of 10Hz-40Hz, average is 32.5Hz. Compared with no control system, the pump power consumption was reduced 33.9%.In conclusion, PID control in the central air conditioning system have a good energy saving effect.
Using CFD Method to Simulate Respiratory Aerosols Transportation in Ventilated Built Environment
Authors: Feng Guo Hui , Zhang Yi , Lan Xin Ying
Published: October 2012

A brief review on the respiratory aerosols transportation in ventilated built environment using CFD method was carried. Performs in-depth literature study about room model, manikin, respiratory aerosols, ventilation type and aerosol particulate matter model. Based on this study, summarizes the research status in quo and the main problem existed at home and abroad. The results showed that (1) recent studies mainly concerned on specific environment such as treatment room, aircraft cabin mock-up, office room, bus and high-speed rail cabin and based on the specific environment to simulate, (2) some studies put emphases only on droplet or droplet nuclei, and at the same time, evaporation, deposition and coagulation were neglected sometimes, (3) there were lack of studies on moving manikins (4) there was no finial conclusion about which ventilation pattern was better for reducing the risk of cross-infection from airborne transmission diseases in a certain place, (5) to choose the Lagrangian method or the Eulerian method for a certain problem generally depends on the subjects, targets, and the computer resources available.
Ventilation Technology and Low Temperature Storage of Granary in China
Authors: Tang Wen Liang , Di Yu Hui
Published: October 2012

With the growth of population and improvement of people’s life quality in our country ,the grain storage requirements are also gradually improving.This paper introduces the development of granary in different times in China,analyzed the advantages and disadvantages of the way of the grain storage and ventilation mode briefly,then introduce the current situation and prospects of the domestic low temperature grain storage.
A New Model of Orthotropic Bodies
Authors: Ke Jiang
Published: October 2012

The solution of linearly elastic and orthotropic solid bodies is very complicated, thus a new element model for solving linearly elastic and orthotropic bodies is presented by using the generalized Hooke's law and the superposition principle. This new model is a simple truss consisting of some bars, and then the solution of orthotropic body becomes simple. Furthermore, this new model reveals the physical mechanism of a solid body under the action of applied forces.
Research of the Pile Bent Property under the Horizontal Load
Authors: Tang Jie Ping , Xie Yao Feng , Liu Ru , Tang Wei Qing
Published: October 2012

The ship impact is one of the main reasons, causing damage to pile wharf. In order to explore the pile bent property under the horizontal load, the finite element numerical analysis software was used to construct the model of the bent, and the data of each pile of the bent has been obtained. According to this data, the basic changing rule of the bending moment and displacement of piles along the pile length was found. Comparing a single vertical pile and fork piles, the difference between them was got. And on that basis, this article preliminarily researched the elastic-plastic characteristics of pile bent.
Outline of Electromagnetic Damper and Further Research on Theoretical Model
Authors: Zou Xiang Yang , Wang Xiao Tian , Yang Guang , Liu Bo , Zhao Zong Yuan , Su Jing Ming , Zhou Ying Chun , Gao Hong Fei
Published: October 2012

The author firstly summarized the principles, performance and theoretical resilience model of the new type electromagnetic damper. The theoretical resilience model is further improved on this basis—normalizing the impact of vibrant frequency and vibrant amplitude on resilience as the impact of single parameter velocity amplitude. The results show that improved model can give a better effect as shown in experiment. This lays a sound foundation for simulation calculation in developing products using for practical engineering and installing the structural vibration reduction system of electromagnetic damper.
Wavelet De-Noising Method of Blasting Vibration Signal Considering Different Level Noise
Authors: Song Bo , Cao Ye , Gao Hong Biao
Published: October 2012

The original signals always mix with certain noise through blasting engineering test of underground structure, such as fan noise, environmental noise and mechanical noise. That makes the useful information of signal characteristics hidden in the noise signal to cause major error for the site test. The superposed signals of the original signal got by using numerical simulation and artificial white noise signal were processed through different de-noising methods based on wavelet transform. After the de-noising effects were evaluated by the evaluation standard signal de-noising performance, the best wavelet function, the effective scale of wavelet decomposition, and the threshold estimation rules were got settled on. Finally, the best de-noising method of blasting vibration signal is got to lay the foundation for the underground structure safety evaluation based on the wavelet transform theory.
Stress Distribution of Aluminum Alloy Thick-Plate under Abnormal Pre-Stretching
Authors: Liao Kai , Wu Yun Xin
Published: October 2012

Abnormal pre-stretching of aluminum alloy thick-plate is simulated by using Marc FEM software to obtain the stress distribution of the plate under non-uniform clamping condition and material macroscopic deficiency. By analyzing the distribution contours, stress distributing characteristics of the pre-stretched thick-plate and their effects to rolling yield of thick plates under several typical cases are classified and summarized. Moreover, solving measures and advices are presented to reduce the negative effects.
The Numerical Research of Two-Degrees-of-Freedom Vortex-Induced Vibrations of Circular Cylinders
Authors: Fan Jie Li , Huang Wei Ping
Published: October 2012

The two-degrees-of-freedom of vortex-induced vibration of circular cylinders is numerically simulated with the software ANSYS/CFX. The VIV characteristic, in the two different conditions (A/D=0.07 and A/D=1.0), is analyzed. When A/D is around 0.07, the amplitude ratio of the cylinder’s VIV between in-line and cross-flow direction in the lock-in is lower than that in the lock-out. The in-line frequency is twice of that in cross-flow direction in the lock-out, but in the lock-in, it is the same as that in cross-flow direction and the same as that of lift force. When A/D is around 1.0, the amplitude ratio of the VIV between in-line and cross-flow in the lock-in is obviously larger than that in the lock-out. Both in the lock-in and in the lock-out, the in-line frequency is twice of that in cross-flow direction.