bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Retarders on the Microstructure of Hardened Building Gypsum Paste and the Mechanism of its Strength Loss
Authors: Qu Jin Dong , Li Bai Zhan , Peng Jia Hui
Published: May 2011

In this paper, by using scanning electric micrograph and mercury intrusion porosimetry, the effects of three types of retarders such as citric acid, sodium polyphosphate, as well as bone glue on crystal morphology and pore structure of hardened gypsum paste have been systemically studied and then the internal cause of strength loss are put forward. The results show that the addition of retarders reduces supersaturation degree in liquid phase during early hydration of hemihydrates, and causes the change of the growth habits and transformation of crystal morphology of dihydrate gypsum from need-like to short prismatic, which correspondingly leads to large size crystals and weakening of the interlacing together of individual crystals. As a result, pore structure of hardened gypsum paste is worsened, which is mainly embodied in the increase of pore size and macro-pore (＞1μm ) fraction to a large extent, ultimately leading to the strength loss of hardened gypsum paste.
The Optimization of Temperature and Relative Humidity Control in Cushing Library
Authors: Liu Cheng Gang , Bruner Homer L.
Published: May 2011

Cushing Library located on Texas A&M University campus is a special building, which needs precise temperature and relative humidity control, because it stores a number of rare collections and memorial books. This paper will concentrate the unit, which serves the book stacks. This AHU is a multiple zone, constant air volume (MZCAV) system, with reheat and direct digital control (DDC). It has a standard cooling coil, glycol cooling coil, steam humidifier, and heat recovery. Because of programming problems and hardware problems, the relative humidity was not controlling properly. In this paper, the new control program for temperature and relative humidity control is implemented and the energy savings from the new control program is estimated.
Optimization and Analysis of HVAC Systems for a Multi-Functional Institutional Building
Authors: Liu Cheng Gang , Bruner Homer L.
Published: May 2011

A multi-functional institutional building often has ventilation and comfort requirements that vary widely from zone to zone. When we commissioned the Reed McDonald building on the main campus of Texas A&M University (TAMU), efforts were made to control its environment according to the zone functions so that occupants can be satisfied with the comfort, and provided with a healthy and safe teaching and working environment. This paper presents a case study of the problems encountered and solutions implemented when recommissioning a multi-functional institutional building.
An Experimental Study on the Luminance Perception of Lighting Environment
Authors: Sun Li Ye , Liu Gang , Hai Hong
Published: May 2011

Considering the characteristics of vision in the low luminance and weak contrast environment, this research obtains a series of simulant scenes. By means of experiment observation, quantification analysis and subjective evaluation, this research proposes a kind of scientific and controllable methods and modes, then relates the quantitative index and the qualitative description in order to take physics and psychological factor into the comprehensive consideration in lighting environment. Finally, it obtains the scope of luminance stimulus and the quantification relations. The results of this research can provide theoretical basis, model and quantitative suggests for corresponding standards. It has significance to urban lighting planning, design and management.
Road High Cutting Slope Stability Analysis under the Influence of Blasting for Excavation
Authors: Gao Wen Xue , Zhuo Zu Cheng , Hou Bing Hui , Chen Ning Ning
Published: May 2011

The impact of blasting effect is an important factor of dynamic stability in the excavation of rock slope. Based on the sub-grade engineering in Jin-hai Lake of the New Countryside Construction Project, this paper sets up a finite element analysis model for the dynamic response of the cutting slope under the blasting loading. It discusses the stress field, displacement field and the propagation law of the blasting seismic wave, and analyzes the security evaluation criteria of the dynamic stability of cutting slope. What’s more, it makes a systematic analysis on the effects of blasting excavation on the stability of the cutting slope according to blasting vibration monitoring. The research provides referential value to form a correct understanding towards slope damage caused by blasting excavation.
A Study on the Urban Community Planning Based on the Idea of Life Quality
Authors: Liu Xiao Xia , Wang Xing Zhong , Zou Xiao Hua
Published: May 2011

The pursuit of life quality is the ultimate goal of the post-modern society. On the basis of the idea of life quality, and through meeting the basic needs of the life space, urban community planning regards the improvement of the life quality in urban community as its ultimate goal. This paper summarizes the core ideas and planning patterns of the current research on the theory of (spatial) quality of life and the relationship between community planning and spatial quality of life both in and abroad, and analyzes the factors that influence life quality in urban community. On this basis the allocation of community space based on the idea of (spatial) quality of life is discussed and relevant principles and processes of community planning are raised.
The Study on Inverse System Decoupling and PDF Control Used in Power Magnetic Pump
Authors: Wang Jun , Zeng Li
Published: May 2011

In this paper, the coupling magnetic field model which the power magnetic pump generated by interference between the rotation and levitation force is linear inverse system decoupling, and study pseudo-derivative feedback control strategy on decoupling linearization system. According to the performance analysis and simulation of pseudo-derivative feedback control system, it can be concluded that pseudo-derivative feedback control system has quick response, high control precision, good control ability, and excellent robustness. It doesn’t ask the controlled object for a exact math model. Little warp will not influence system performance. It can be applied to project system.
Secondary Evacuation Systems for Skyscrapers: Post 9/11 Tall Building Safety Research
Authors: Liu Chang An , Kong Ya Wei , Zhao Ji Long
Published: May 2011

Skyscrapers are playing a more and more important role in modern life and definitely more and more tall buildings will be built in the future. But at the same time they are facing more threats from terrorists, fire, earthquake and other unforeseeable factors than before. This paper presents the idea of providing a secondary evacuation system in tall buildings, as a supplement to the existing primary means of evacuation especially when they are damaged or unusable in an extreme event. It illustrates the design flaws inherent in high-rise buildings today and the inadequacy of their primary evacuation systems and introduces some new mechanisms currently used as a secondary evacuation system. The paper thus serves as an introduction to this area and produces some useful advice for increasing the safety of tall buildings.
Study on Cold-Formed Steel of Thin-Walled Housing for Dynamic Performance
Authors: Yao Yong , Chu Yun Peng , Wang Li , Zhao Rui
Published: May 2011

Cold-formed steel structure is suitable for post-earthquake reconstruction since its good seismic performance and construction speed. Analyzing the dynamic characteristic of a two story office building by using the finite element software ANSYS. And the results show that: (1) in the time history analysis based on three types of seismic waves the lateral displacement of the structure and rotation between layers to meet the relevant specifications when confront the rare earthquake (2) Under the seismic loads, earthquake response acceleration amplification factor is smaller which indicating better seismic performance and it can be used in areas with high seismic intensity.
Spark Plasma Sintering TiAl Alloy from Mechanically Activated Powders
Authors: Wang Zhi Wei , Cheng Hong , Cheng Hui Ming
Published: May 2011

Powder of Ti-46at%Al alloy was synthesized through mechanical activation (MA) and then sintered and concurrently consolidated in a short sintering time of 900 s by using spark plasma sintering (SPS) process. The XRD and SEM profiles show that the microstructures of TiAl alloys contained γ TiAl and small amount α-2 Ti3Al phase, whose amount can be controlled by the sintering temperature. The compacts retained the original fine-grained fully densified bodies by avoiding an excessively high sintering temperature. The alloys sintered at higher temperature with this process showed a coarser microstructure. So it is possible to produce dense nanostructured TiAl alloys by mechanically activated spark plasma sintering (MASPS) within a very short period of time.
Finite Element Analysis of Compressive Strength of Recycled Coarse Aggregate-Filled Concrete
Authors: Li Jing , Liu Zhen , Qu Xian Feng , Zhu Chong Qiang , Zhang Yuan
Published: May 2011

In order to study prism compressive strength of recycled coarse aggregates-filled concrete, recycled coarse aggregates of particle size for 40-80mm were made from abandoned brick and concrete blocks. 4 groups of recycled coarse aggregates-filled concrete prism objects were made, and the compressive strength of the specimens were done. Using the finite element analytical software(ANSYS) , the stress nephogram and fractured condition of recycled coarse aggregate-filled concrete were obtained after the establishment of the geometric model, calculational model and mechanical model. The results showed that numerical simulation results were good agree with the actual experimental results.
Preparation of Mullite Nanocomposites Powders from Coal Fly Ash via Hydrothermal Crystallization
Authors: Tong Lin Xin , Li Jin Hong , Shen Jie , Jiang Xiao Qian
Published: May 2011

Mullite nanocomposites powders have been successfully synthesized from high-aluminium coal fly ash via hydrothermal crystallization process. The mullite nanocomposites powders are investigated and charactered by laser particle size analysis, BET surface area analysis, X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) analysis, selected area electron diffraction (SAED) analysis and energy-dispersive X-ray (EDX) analysis. Moreover, the reaction mechanism is speculated according to MAS-NMR results. The experimental results show that mullite nanocomposites powders can be prepared at 80-90 °C for 3 h with NaOH concentration of 2-4 mol/L and L/S ratio (liquid/solid ratio in mass) of 10 mL/g. The powder size of D50is about 1.88-3.27 mm. Mullite nanocomposites are mainly rod-like, acicular and fibroid in shape with an range of 30-80 nm in length and an range of 4.5-30 nm in diameter. MAS-NMR analysis indicates that the nano-size mullite grow around the central atom-Al, Si of [AlSi]O4tetrahedral and the growth unit Al[OH]4-is existed in this process definitely.
Earthships-Scrap Tires Recycling in Building Design
Authors: Kang Zhen Zhen , Li Xiao Jun , Liu Cong Hong
Published: May 2011

With rapid development in automobile industry and increasing environment problems, a difficulty confronting many countries is how to recycle scrape tires. The earthship comes out as an effective way to make full use of scrap tires in building design. By introducing its construction procedure, current conditions at home and abroad, and two case studies abroad, the paper concludes its advantages in environment protection, building performance, economy and technology. Besides, in view of the present condition in China, It suggests to first build earthships in less developed areas, or areas with extreme weather conditions, and try to popularize them in temporary structures, garden buildings, or special buildings.
The Some Concept Design’s Typical Characteristics of Building Structure
Authors: Ding Ting , Li Qi Wen , Ding Sheng Guo
Published: May 2011

The characteristics of effect are expounded for different structure under the specific load. These internal force and deformation characteristics in conceptual design should be caused take attention seriously. After summing up a lot of engineering structure calculation based on the results of different structure, some typical characteristics of load effect can be reduced , usually these typical effects called conceptual design features. Understanding of these internal force and deformation characteristics of structures is beneficial for deepening professional quality, and improving the professional foundation. Readers with diligence paid to various structure and further study, will be able to cognitively find more conceptual design features, make innovations, and constantly enrich itself the experience of conceptual design.
Structure Response of Cable-Stayed Bridge that Is Used with a Known Earthquake Spectrum
Authors: Ma Yong Bin , Du Yong Feng
Published: May 2011

A spectrum analysis is one in which the results of a modal analysis are used with a known spectrum to calculate displacements and stresses in the model. It is mainly used in place of a time-history analysis to determine the response of structures to random or time-dependent loading conditions such as earthquakes, wind loads, ocean wave loads, jet engine thrust, rocket motor vibrations, and so on. The paper is to analysis displacements and stresses of a cable-stayed bridge that is used with a known earthquake spectrum.
Concept and Practice of Landscape Planning and Designing on Ancillary Buildings in Kizil Reservoir in Kuqa, Xinjiang
Authors: Chen Ying Jie , Hu Xiang Hong , Xia Xin Li , Mu Jun Jing , Zhao Heng
Published: May 2011

Landscape design of reservoir buildings is an important part modern hydraulic engineering. Besides specific functions, all buildings in the reservoir should be carriers of histories, cultures, ethical customs and modern technologies. In the present paper, engineering characteristics of Kizil reservoir, combined with specific human geography environment was comprehensively analyzed based on principles of landscape. Corresponding concept, design and program of landscape are proposed, so as to provide an important foundation for the construction of reservoir landscape ecology and development of local tourism resources.
Formation of HAAs during Chlorination of Aspartic Acid in Drinking Water
Authors: Chen Zhong Lin , Li An , Wang Sheng Jun , Han Ying , Liu Feng , Shen Ji Min
Published: May 2011

As a traditional disinfection method, chlorination disinfection is used generally in the plants ,however, disinfection by-products (DBPs) during chlorination process generate accordingly. Nitrogenous organic compounds is a kind of important precursors of DBPs. Haloacetic acids (HAAs) is one kind of the main DBPs. Aspartic acid (Asp) is one kind of elementary amino acids,which are typical nitrogenous organic compounds.In this paper, the formation characteristics of HAAs by Asp under different chlorination disinfection conditions have been researched, such as reaction time, chlorine dosage, pH, temperature and Br- . The results show that the yields of dichloroacetic acid(DCAA) and trichloroacetic acid(TCAA) are both increased with the reaction time increasing,and the formation rates is accelerated at the initial period; With the increase of chlorine dosage, the yields of DCAA and TCAA increased; The yield of DCAA and TCAA are both low in the acidic condition and high in the conditions of neutral and alkaline conditions. The yield of DCAA and TCAA increased with the increase of temperature. When there is Br- in water, bromided-HAAs can be formed.The total HAAs yield and BIF both increase with the increase of Br- concentration. The HAAs constituents contain DCAA,TCAA,BCAA,DBCAA, DCBAA, DBAA and TBAA. At low Br- concentration,the order of HAAs constituents yields is DCAA>BCAA>DCBAA>TCAA>DBCAA> DBAA>TBAA.
Runoff Quantity Dynamic from an Extensive Green Roof during Individual Rainstorms
Authors: Ye Jian Jun , Zhang Hua , Yu Shi Xiao , Guo Sheng Bo , Xu Wen Nian , Li Heng Wei
Published: May 2011

This study evaluates the influence of an extensive green roof on runoff quantity dynamic during individual rainstorms in Central China. Controlled experiments on a simulated extensive green-roof plot were carried out firstly to produce a unit hydrograph (UH) by the methods of S-curve linearization treatment and curve fitting. Then in situ tests were conducted to compare runoff quantity per minute from the green roof plot and a conventional roof plot to verify the obtained UH and compare their runoff quantity dynamic during two rain storms in the year of 2009.The obtained UH is able to predict accurately peak flows and runoff volumes for any rain input. When the initial water content of the substrate was dry, the 7 cm thick green roof can delay the runoff initiating for nearly 8 minutes, lower runoff peak and volume by about 50% compared with conventional roof during a 10.1mm rainstorm on 7 June; and even when the substrate was wet, the extensive green roof can detain runoff effectively by 129 min longer than conventional roof and thus lower the peak flow of runoff by 43% during a 6.3 mm rainstorm on 12 March.
The Application and Research of Rural Landscape Element in Environmental Design of Small Towns
Authors: Liu Qing Qing , Yuan Li
Published: May 2011

Rural landscape elements reflect lifestyle and cultural awareness of local residents, people can capture the characteristics of cultural identity within the territory clearly; the other hand, people can live their own lives, accurate positioning of space activities, and handle the relationship between culture and nature on the sustainable development of modern town planning and design of great significance. The article is gonging to focus on the local environment and landscape elements to create a small town in the theoretical basis, practice application methods were studied.
A Research into the Regional Characteristics of Log Construction in Changbaishan Area
Authors: Yu Wei , Liu Si Duo
Published: May 2011

By studying log construction in Changbaishan area, this article sets to analyze the architectural characteristics of log construction in the process of adjusting to the regional characteristics in Northeast China and therefore, provides references for designing modern architecture with local features under the backdrop of economic and cultural globalization.
Application of the Water Poverty Index at the Districts of Yellow River Basin
Authors: Li Xin , Wan Jun , Jia Jie Lin
Published: May 2011

As one assessment method of the water resources, Water Poverty Index has become an available tool in water resources management for it simply calculation process, comprehensive understanding of the results. This paper introduces the concept of the Water Poverty Index, and applies it at these districts of Yellow River Basin by using equal weightings methodology. During the process of calculating it, some component variables of the WPI have been improved and the data addressed standardization. The result shows that the water resources of Shandong is safe, Sichuan and Henan province is middling safe and low safe, while the WPI of the other six provinces is so low which reflects water resources shortage is very severe. The same time, this paper analysis the main reasons of water poverty, which provides the access to improve the water resource management in these districts.
Analysis of the Sediment Characteristics of the Caofeidian Sea Area
Authors: Kuang Cui Ping , Hu Ying , Gu Jie , Huang Jing , Liu Xu
Published: May 2011

Caofeidian harbor is a large size deep-water harbor currently under construction in the eastern coast of north China. The construction began in 2003. Based on the measurements and analysis of the sediment samples collected from 2008 to 2010, the characteristics of suspended sediment concentration, suspended sediment and bed material grain diameter of the Caofeidian sea area with the progress of the engineering are presented. The measurements and analysis reveal that i) the suspended sediment concentration is low and decreases with the engineering progress; ii) the suspended sediment is very fine and becomes coarse in the deep-water channel; iii) the bed sediment in the east of Caofeidian foreland is much coarser than that in the west part.
Analysis on the Development Mechanism and Failure Modes of Rainstorm-Induced Road Hazards
Authors: Tang Lian Sheng , Lin Pei Yuan , Wang Zhi Qiang , Li Xin , Wu Ke , Hu Hui
Published: May 2011

According to the limitation on applying the research achievement on regional rainstorm-induced road hazard into practice, formation mechanism and development patterns are analyzed and investigated deeply, then two stages on forming the rainstorm-induced road hazard are verified: ① The hydrodynamic action stage, including the rainstorm splash-wash erosion process and infiltration-seepage process; ② The hydrostatic action stage, including rainwater immersion-softening process. They are combined to establish a series interaction processes termed "splash-wash-infiltration-seepage-immersion-softening" to define the formation mechanism mode for the rainstorm-induced road hazard. full cut,full fill,cut and fillare considered to be the three typical failure patterns for the rainstorm-induced road hazard and all types are boiled down to "cumulative deformation failure → developing and catastrophe failure → hysteretic deformation failure" three failure process, in order to reflecting the occurring and evolving law for the rainstorm-induced road hazard, comprehensive and systematic analysis are implemented into every single failure mode and process. The study achievements indicate a new clue for approaching the formation mechanism and developing mode of rainstorm-induced road hazard, and are of value to disaster prevention and reduction in road engineering.
Strength of Interior Reinforced Concrete Beam-Column Assembles
Authors: Lee Jung Yoon , Park Jong Wook , Cha Sang A
Published: May 2011

This paper provides a method to predict the strength of interior reinforced concrete beam-column joints that fail in shear before the plastic hinges occur at both ends of the adjacent beams. The proposed method takes into account the axial force ratio, the compressive strength of concrete, and the shear strength deterioration in the beam-column joints. In order to verify the shear strength of the proposed method, the behaviors of 38 interior beam-column joints were compared. Comparisons between the observed and calculated shear strengths of the tested beam-column assembles, showed reasonable agreement.
Elasto-Plastic History Analysis of Reinforced Concrete Frame Structure Based on Fiber Beam-Column Model
Authors: Tang Cao Ming , Nie Qi
Published: May 2011

The three parameters of the earthquake ground motions(peak amplitude, spectrum and duration) and dynamic elasto-plastic properties of the building structure can be considered in elasto-plastic history analysis method, therefore it is significant for seismic performance assessment, nonlinear development progress and failure mechanic analysis of building structures under different level earthquake. The accuracy and availability for constitutive model of concrete and reinforcement subjected to cyclic loading have an important influence on reliability of the elasto-plastic history analysis of building structure based on material model. However, due to the complexity of concrete material, there is no unified constitutive model can be used to analyze nonlinear mechanical behavior of concrete until now. In this paper, a practical uniaxial hysteretic constitutive model of concrete and reinforcement is proposed, a computer program of material model is developed and the model is inserted into ABAQUS software with the user subroutine, using fiber beam element model and explicit time integration method, a elasto-plastic history analysis for shaking table test model of 12-story reinforced concrete frame is carried out. The comparison between computation analysis and experimental results shows that the model has a higher accuracy, efficiency and better availability, it is suitable for the constitutive model of concrete and reinforcement used in elasto-plastic history analysis of building structure.
Effect Evaluation on CFG Pile Consolided Foundation of the Red Clay Being Polluted by Organic Matter
Authors: Mu Chun Mei , Liu Bao Chen , Liu Zhi Kui
Published: May 2011

Lots of “problematical piles” have been discovered during inspection of core-pulling to cement mixing piles, and the layout of the problematical piles are not uniform. Emergence of the problematical piles have conduced invalidation of the cement mixing piles. Combining practical works of the engineering unit, a series of tests and studies have been done, for example, inspection of core-pulling and excavation, static loading test, testing the indexes of physical and mechanical properties with the decrease of the distance between cement mixing piles and septic tank, compressive strength test,etc.The research indicates that all test result have contented design demand and attained prospective effect. These studing have an important significance on the reinforcement design and engineering practice of red clay being polluted by organie matter.
On the Nonlinear Effect of Joint Work of the Basis, Foundation Slab and the Structure
Authors: Andreev Vladimir I. , Barmenkova Elena V. , Matveeva Alena V.
Published: May 2011

We have already considered the problem of joint work of structure, foundation slab and basis in [1, 2] (two-layer beam or slab on elastic basis). The distinctive paper is devoted to analysis of two-layer beam-strip on elastic basis, which corresponds to the problem of the plane deformed state. Nonlinear dependence of internal forces on structure height is presented.
Analysis of the Problem of Construction Enterprise's Human Resources Structure Optimization
Authors: Ou Ying
Published: May 2011

The human resources structure situation and its the subject problems of the Chinese construction enterprises were analyzed, The reasons were studied from the aspect of the planned economy system, human affairs system, internal management system and enterprise human capital investment. The target-oriented measures were proposed to optimize the human resources structure of the chinese construction enterprise and enhance the enterprise competitiveness.
A Case Study on the Design of Green Building in Expo 2010 Shanghai
Authors: Fan Jun Jie
Published: May 2011

A good many ideas, strategies, cases and technologies of green building were brought forth in Expo 2010 Shanghai on the theme of “Better City, Better Life”. This papers deals with the analyze of these cases, and study how to put the application of green technologies and strategies into the urbanism of China base on the situation of the country, It could be significative and necessary for China when we want to create a resource-conserving and environment-friendly society and realize sustainable development.
Numerical Simulation of Temporal Evolution of Local Scour in Bridge Pier with Nonuniform Sediment
Authors: Aarabi Mohammad J. , Chamani Mohammad R. , Dehghani Amir A. , Asghari Keyvan
Published: May 2011

Due to economical and serviceability reasons, local scour must be considered in the design of bridge piers. Although beds of natural rivers consist of nonuniform sediments, but most researches in this subject were carried out with uniform sediments. In nonuniform sediments case, the effect of sheltering of the finer particles by the coarser ones may alter the scour process. In this paper, the time-variation of local scour with nonuniform sediments around a cylinder pier is simulated using SSIIM software. This study shows that the SSIIM is capable of predicting the temporal evolution of local scour in bridge piers with nonuniform sediments.
Simulation of Crater’s Formation Mechanism on Target GH3536 Surface Irradiated by High Intensity Pulsed Ion Beams
Authors: Mo Chun Li , Wang Chen Yuan
Published: May 2011

Body Heat Flux Mode characterised by Element Birth and Death method is built to simulate the thermal effect of target GH3536 irradiated by HIPIB with different energy parameters using the FEM (Finite Element Method) software. The thermal data of the metal surface irradiated by HIPIB is obtained. The simulated result has proved that the explosive eruption of the inner surface is the dominant mechanism of the formation of dense craters with large sizes when the ion current energy input is high.
Numerical Simulation of Single Box Floating Breakwater in Time Domain
Authors: Zheng Yan Na , Dong Guo Hai , Guo Ben Chao , Chen Chang Ping
Published: May 2011

Based on boundary element method, a mathematical model of single box floating breakwater with mooring chain under regular wave is developed in time domain. From the comparison with the experimental data, the numerical program can simulate the transmission coefficient variaty tendency well, while on the aspect of the quantity, the numerical result is always larger than the experimental one, for the ignorance of the friction and dissipation energy.
The Integrative Application of GAHP and FCE Method in Real Estate Investment Decision
Authors: Feng Jun
Published: May 2011

Based on analysising the influence factors of real estate investment decision, the paper establishes an evaluation index system of real estate investment decision, and applies integratively Group analytic hierarchy process(GAHP) and Fuzzy comprehensive evaluation(FCE) method to analysis the decision-making of real estate investment, to provide a more scientific quantitative basis for the decision-maker of real estate investment, so real estate investment decision has stronger scientificity.
Study on the Investment Options Worth and Decision of Real Estate Enterprise under Limited Investment Time Limited
Authors: Feng Jun
Published: May 2011

Based on the insufficient of indefinitely suppose on Project investment in general real option study, the paper studies Investment option evaluation problem of project, which has deadline requirements for Investing time. This paper is based on investment policy of real estate in China, and establishes a model, and the study give valid investment opportunities within time T, investors in which has investment flexible management of investment projects value evaluation.
Modification Mechanism of SEAM-Added Asphalt Mixture and its Application in Severely Frigid Zone
Authors: Zhao Bin , Ma Shu Xun , Hao Pei Wen
Published: May 2011

Sulfur extended asphalt technique is an effective technical means as it uses SEAM as an additives of asphalt mixture. According to the analysis of SEAM modified asphalt mixture mechanism and the functions of SEAM in asphalt mixture, SEAM has a well modification. The application of SEAM in severely frigid area researchs the major parameters of mix design for AC–25 SEAM.
Correct Method of Analytical Solution of Multipoint Boundary Problems of Structural Analysis for Systems of Ordinary Differential Equations with Piecewise Constant Coefficients
Authors: Akimov Pavel A. , Sidorov Vladimir N.
Published: May 2011

This paper is devoted to correct method of analytical solution of multipoint boundary problems of structural analysis for systems of ordinary differential equations with piecewise constant coefficients. Its major peculiarities include universality, computer-oriented algorithm involving theory of distributions, computational stability, optimal conditionality of resultant systems and partial Jordan decomposition of matrix of coefficients, eliminating necessity of calculation of root vectors.
Analyzing Space and Psychology Rules for Designing the Senior Apartments of Old Urban People
Authors: Xu Hong
Published: May 2011

This paper analyzed the space and physiological design rules for the senior apartments. Then this paper proposed an integration design approach of these space and physiological design rules based on Soil Building- a kind of Chinese traditional apartment design style. The results show promising value of this integration in designing the senior apartments for the old urban people.
Simulation of Welding Residual Stress to the Fracture Strength of Steel Moment-Resist Frame Connection
Authors: Fan Te Wei
Published: May 2011

Inspection made for moment-resist frame connection assembled by welding found that most failures occurred in weld zone between beam and column flange connections, and these failures were caused by cracks initiated at the root of weld. The main reason for the crack initiation is not plastic deformation as expected, and the evaluation results indicated that the major failure mechanism for the brittle failure behavior of moment-resist frame (MRF) connection is caused by the residual stress induced by welding. This paper use finite element method to simulate welding residual stress, and apply them into 3D fracture models. With fracture parameters calculated in finite element analysis, information about fracture strength of MRF connection is acquired.
The Fehleranalyse Error Analysis of Fully Characteristic Curve of Pump to Be Nominalization and Study for the Influence on Result of Hydraulic Transients Calculation
Authors: Yang Yu Si , Dong Ru , Gao Jie
Published: May 2011

In this paper，by transforming the fully characteristic curve of pump with eighty specific speed to be numeralization he obtained fehleranalyse error of discrete data were analyzed based on the pump similarity theory and the difference between certain assumed condition and real situation in numeralization process. Then the influence of the fehleranalyse error of numeralization method on the pressure boost caused by Pump-off water hammer was computed by a Pump-off water hammer calculation within an real engineering project. The reliability of numeric calculation method of fully characteristic curve of Pump is proved.
Building Equipment Life Cycle Cost Studies
Authors: Zhang Zhao
Published: May 2011

The summary of building equipment life cycle cost of the meaning and detailed analysis of the life cycle cost of building equipment, and the establishment of the life cycle cost of building equipment, all the models. An engineering example life cycle cost of building equipment, the analysis shows that the whole life cycle cost method of building equipment and analysis of the scheme to reduce the cost of system, to enhance the system provided on the economy.
Research on the University Inventory Control of Diet Low Maintenance Materials
Authors: Lu Qing , Lin Jin Zhong , Liu Qi Hui
Published: May 2011

The current management situation of the diet low-cost materials inventory in the university is analyzed in this paper and two solutions are given: ABC inventory analysis method and inventory control strategies. The calculation method of the ABC inventory analysis method is introduced through the management data of the low-cost materials inventory in some university, and the different control strategies are also explained according to different raw materials in the inventory control strategies. The order place and the calculation method of order quantity are given under the condition of determining the demand and lead time, and under the condition of uncertain of the demand and lead time, that provide a theoretical basis for the inventory control management.
Study on the Performance and Application of Interior Moisture Buffering Materials for the Typical Housing in Taiwan
Authors: Yeh Yu Chun , Tsay Yaw Shyan , Chiang Che Ming
Published: May 2011

The humidity issue is one of the essential factors regarding the indoor environment quality. Researchers attempt to control the moisture in different methods, and the quantity of the researches keeps rising, which indicates the importance of the moisture buffering effect. The moisture buffering effect is a kind of passive design method, which is considered as more sustainable, compared to mechanical and chemical solutions. Taiwan locates in subtropics. However, the local researches concerning the moisture buffering effect in Taiwan are relatively fewer than those countries, which have lower temperature and humidity climate conditions than Taiwan. In addition, the general dehumidifying methods used in Taiwan are more concentrated in mechanical or chemical dehumidifying solutions. Moreover, typical town house in Taiwan usually represents as a north-south or east-west long axis living system without opening at the opposite axis, which leads the closed spaces with less openings for ventilations in the typical Taiwan town house, and those closed spaces are the main areas where the moisture accumulates. Therefore, this study follows the JIS A1470-1:2008 standard testing the MBV(Moisture Buffering Value) of 4 plate building and interior materials (Paulownia wood, Plywood, Pinewood, and Moisture Buffering Tile) and 3 Granular building and interior materials (Bamboo Charcoal, Activated Charcoal, and Silica Gel), and proposed design strategies along with moisture buffering materials (Double Wall System and Raised Floor System for existing building, and Counter-Beam System and Vertical Ventilation Duct for new construction) to provide local examples or references to Architects and interior designers in Taiwan.
Comparison for Different Circumferential Weld-Induced Imperfections on Steel Silos
Authors: Chen Xiang Rong , Jiang Yuan Yuan , Zhao Zhi Yun
Published: May 2011

As the thin-walled structure,the buckling of steel silos is very sensitive to the initial geometric imperfections. However, these imperfections are uncertain to the shape and amplitude, so the studies of the initial geometric imperfections have important practical significance. Over the years, the circumferential imperfections have been known to result in the most important influence on the buckling of steel silos, which is also the most common defect in practical engineering. Using the existing research results, this paper analyzes three different imperfection shape functions and compare to the result of experiment in order to identify a function for the finite element analysis.
Study on the High Bench Cast-Blasting Effects Influenced by Explosive Specific Charge
Authors: Li Xiang Long , Liu Dian Shu , Luan Long Fa , Yang Yi , Zhang Zhi Yu
Published: May 2011

Explosive specific charge is the key to the high level of casting blast. In order to study how the explosive specific charge affects the high bench cast blasting, theoretical analysis and experimental study were used in the Hei Dai-gou open pit cast blasting. Experimental study shows that: under the same engineering geological conditions and blasting parameters, the throw distance increases as the average explosives specific charge increases, and this trend slows down gradually. Settlement muck-pile height increases as explosives specific charge increases, and then gently muck-pile shape tends to be more conducive to the work platform dragline flat-field and inverted reactor efficiency. Whenq> 0.65 kg/m3, the cast percentage can reach more than 30%, as 0.67 kg/m3<q<0.70 kg/m3, the cast percentage increases with a significant effect as the explosives specific charge increases; whenq> 0.74 kg/m3, the increasing rate of the cast percentage with the increase of explosive specific charge decreases.
Experiment Study on One Dimensional Vertical Soil Pole Seeper Infiltration of Unsaturated Clayey Sand
Authors: Miao Qiang Qiang , Chen Zheng Han , Zhu Qing Qing , Yao Zhi Hua , Zhang Jun Hao
Published: May 2011

Measuring system of soil moisture and water bedload LGD-Ⅲ was used in those tests . Infiltration law of one dimensional vertical soil poles were carried out profound studies,under different density and a constant water head . At the same time,the course of wetness front along with time pass away, infiltration law along with time pass away and different high water content along with time pass away were made a comprehensive studies , under different dry density. According to a great deal of test data, the relationship between wetness front and time was given to a function under different dry density.
Experimental Study on Reinforcement Ratio of RCFT Columns under Axial Compression
Authors: Xiamuxi Alifujiang , Hasegawa Akira
Published: May 2011

It is clear from the former researches on reinforced concrete filled tubular steel (RCFT) structures that RCFT structures have better performance than concrete filled tubular steel (CFT) structures, in other words, because of the existence of reinforcement, the performance of RCFT differed from that of CFT. Therefore, to clarify the effect of axial reinforcement on mechanical properties of RCFT, compression tests of RCFT columns with different ratio of axial reinforcement were carried out, meanwhile, corresponding tests of CFT, reinforced concrete (RC), pure concrete, and steel tube columns were done to compare with RCFT. By a series of comparison and analysis, effect of axial reinforcement on RCFT columns were discussed, and following conclusions were drawn: reinforcement ratio has direct effect on performance of RCFT. Over arranged reinforcement will cause pre-failure of concrete without exerting strength of reinforcement, and not only may cause brittle-failure or lower performance of the structure, but also cause the increase of construction cost. On the contrary, proper ratio of reinforcement can make the RCFT possess better confined effect, improve overall performance of the RCFT structure; furthermore, whatever the ratio of reinforcement, RCFT has better performance than both CFT and RC, especially possesses more brittle-failure resistance than CFT.
Shrinkage Cracking Resistance Property of Self-Compacting Concrete
Authors: Jin Xian Yu , Fu Chuan Qing , Jin Nan Guo , Ge Fan , Zhao Yi Bing
Published: May 2011

Based on the project requirement of a nuclear power plant, using the method of free shrinkage test and ring cracking test, shrinkage cracking resistance property of grade C35 and C50 self-compacting concrete (SCC) with the optimized mix proportion was studied. The test results between SCC and ordinary vibrated concrete afforded by nuclear power plant project with the same grade were compared. The results indicated that the shrinkage cracking resistance property of SCC is prior to the ordinary vibrated concrete with the same strength grade. This kind of SCC can satisfy the nuclear power plant project, also the test results can be a reference of SCC design theory.
Inhibiting Sulphate Attack on Concrete by Hydrophobic Green Plant Extract
Authors: Abdulrahman A.S. , Ismail Mohammad , Hussain Mohammad Sakhawat
Published: May 2011

Organic base (Amine) and inorganic base (Nitrite) have been known for protection of concrete structures but are not commercially indigenous to most developing economies due to manufacturing difficulties and are toxic to the environment. Also inhibitors are not known to stop sulphate attack in concrete. Hence, the objective of the present investigation was to study a novel, eco-friendly and hydrophobic green plant extracts inhibitor and compares its effectiveness with established calcium nitrite and ethanolamine inhibitors. Bambusa Arundinacea (Green plant extracts), calcium nitrite and ethanolamine corrosion inhibitors were selected for the present investigation. Compressive strength of 100×100×100mm concrete cubes after 7, 28 and 90 days of curing test was used. The results of the inhibitors studied showed that Bambusa Arundinacea has superior compressive strength compared to calcium nitrite and ethanolamine. Bambusa Arundinacea may be considered a better substitute for nitrite and amine- based corrosion inhibiting admixtures for durable concrete structures due its pore blocking effects.
Concrete Structure with Random Material Properties Undergoing Thermal Loading
Authors: Kowalik Malgorzata
Published: May 2011

Stochastic finite differences are proposed for analysis of pore pressures in concrete structure with random material properties subjected to fire loadings. The theoretical formulation of the problem is described. A system of partial differential equations is obtained and solved for first two probabilistic moments of the random pressure field. Example of stochastic analysis in concrete structure with random material parameters is given.
Precaution Policy and Investigation on Pollution Status of Rural Domestic Waste in Beijing
Authors: Li Ying , Xv Shao Hua , Zhou Jing
Published: May 2011

By investigating 18 villages of a town in Beijing, some pollution problems are shown as follows: collection and management system of waste is incomplete and the villagers know little about environment protection; garbage cans, many of which are damaged and lost, are far more to meet the disposal demand of increasing solid wastes; insufficient collecting vehicles run inefficiently, and simple landfill is the only disposal way. In the end, related countermeasures are put forward basing on analysis of region status.
The Study on Chemical Weapons Abandoned by Japanese in China: Aim to Ascertain the Burial Sites and Pollution Disposal
Authors: Zhang Fu Cun , Wang Yu Shan , Shi Feng Hua , Li Xu Feng , Zhang Meng Nan
Published: May 2011

Lots of chemical weapons abandoned by Japanese in China during World War II lead to serious harm to human health as well as inducing abrupt casualty accidents. It is put forward that some geophysical methods such as low-altitude thermal infrared remote sensing, 3D high density electrical method and 3D geological radar combined with small-diameter exploratory hole method can be used for detailed detection, to ascertain the burial sites, spatial distribution and pollution degree of approximate confirmed weapons in this paper. Then, on the basis of this, take safety assessment and make programs to manage and prevent collision pertinently in order to establish technique method system of pollution investigation and disposal which is suitable for various conditions and different pollution degree.
Buckling Analysis of Sway Steel Frames with Semi-Rigid Connections
Authors: Wang Wan Zhen , Xu Ji Xiang , Chen Fei Yi
Published: May 2011

The modified factor formulas, which are applicable to sway steel frames, are derived by considering joint relative rotational stiffness and adopting the modified stiffness factor. The finite element models of steel frames with semi-rigid and rigid connections are established using ANSYS program. Nonlinear finite element analysis of steel frames with two web and top-seat angles steel semi-rigid connections is conducted. Through bulking analysis of sway steel frames with semi-rigid connections, the effective length factor of sway steel frames is derived, which considers nonlinear rotation of two web and top-seat angles steel semi-rigid connections.
On Campus Communication - Take South China University of Technology for Example
Authors: Xue Ju
Published: May 2011

Nowadays high-quality and versatile-quality talents are in demand and study place is no longer confined to classroom, which makes people realize the importance of campus communication space for cultivating people. How to create a special and connotative campus environment with culture foundation by combining the space design is the focus of this paper, and take South China University of Technology for example, I will discuss how the campus public open space help the development of students in order to find a design method suitable for campus public open space.
Thought on Architecture Specialty Course Construction of China Three Gorges University
Authors: Xue Ju
Published: May 2011

After the release of “The outline of the state medium and long term education reform and development plan” (Outline), all the domestic colleges and universities are thinking about their future development in education. In this background, by learning the Outline, the author puts forward the target of architecture undergraduate education development in CTGU from the aspects of specialty assessment, talented people training, course construction and teaching reform.