bluuebunny/crossref_metadata_2025 huggingface dataset:
Finite Element Analysis of Plane Shear(Mode II) Fracture Mechanism of Brittle Rock at High Temperature
Authors: Wang Zhi , Sun Hai Wei , Shang Shi Peng , Shi Wei Xing
Published: February 2012

Finite element method is used to calculate the crack-tip stresses of rock specimens under plane compression-shear loading in order to study the mechanism of plane shear(Mode II)fracture. Numerical results show that both the tensile and shear stresses exist at the crack tip and the ratio of maximum shear stress to maximum tensile stress,τmax/σ1,is about 3-6. Since the additional compressive can restrain tensile stresses at the crack-tip, τmax can easily reach its limited value before σ1 and cause plane shear(Mode II)fracture. Plane shear-box test is a potential method for obtaining Mode II fracture of rock and determining Mode II fracture toughness KIIC of rock.
Nonlinear Mechanical Characters of Shallow Reticulated Spherical Shells with Initial Damage
Authors: Li Lei , Hao Ji Ping , Huang Yi
Published: February 2012

Based on theory of Lematire’s equivalent strain of the damage and with the damage of bars of the shallow reticulated spherical shell, on the basis of the nonlinear dynamical foundational equations and introducing dimensionless quantity of shells with uniform thickness, the nonlinear dynamic equation of the shallow spherical shells with initial damage were established by the method of quasi-shells. Then, the critical conditions of that chaos motion of the structure with initial damage are given by the Melnikov function. Finally, further using the digital simulation plotted the plane phase and it approved existence of the chaotic motion. It is found that the natural frequency of shallow reticulated spherical shells considering initial damage becomes bigger and the critical value of chaotic motion is smaller.
The Study of the Confinement Velocity in the Longitudinal Ventilation Tunnel Fire
Authors: Sun Ke Qing , Yang Hui
Published: February 2012

For the situation that the smoke exhaust vents are located on both sides of the fire source, critical ventilation velocity is not appropriate to evaluate the smoke control effect. “Confinement velocity” is proposed as the characteristic parameter to study the longitudinal ventilation by O.Vauquelin in this situation. However, there have been few studies on confinement velocity. An experimental study was carried out on two reduced scale tunnel models. The main objective is to analysis the relationship between confinement velocity and fire heat release in this situation. Helium and air in different ratio was used as the smoke, and the "cold smoke" produced by smoke generator was put into the mixed gas in order to measure the length of smoke layer. The experimental models were based on the half tunnel as flow field at two sides of fire is symmetrical. The CFD model was created on the basis of the experiment, and the results were basically accord with the experimental results. It was shown from the experimental results that the critical point of the confinement velocity is between L / H = 2 to L / H = 4 in section 1, between L / H = 1 to L / H = 2 in section 2, rather than a fixed value; Two tunnel models had similar dimensionless confinement velocity, but the dimensionless total confinement velocity was different.
Upper Cantilevered Scaffold Construction Technology Analysis of Ultra-High Tower
Authors: Yan Xiang Mei
Published: February 2012

Each layer of super high tower body is outwards protuberant, scaffoldding cantilevered end larger. This paper analyzes and researches the ultra-high tower overhanging scaffolding construction preparation, high scaffold material requirements, construction requirements, scaffold erection and dismantling construction technology and other aspects, it solves the high difficulty in construction, and provides practical basis and construction experience for super high steel tower mast structure.
Introduction of Vertical Mine Shaft Sinking by Full Section Boring Method
Authors: Jiang Hao Liang
Published: February 2012

The shaft drilling method is a fully mechanized operated mine shaft sinking method when shaft sinking through the soft and weak overburden layer. the new full section boring method can reduce the number of reaming, the number of bits, energy consumption and increase completed advance rate of shaft over 20%, reduce emissions of waste drilling mud by 20% . The paper in detail stated the features of the Full Section boring method operation，the implementation mode，design principle and support technology．
The Study on 3D Urban Planning Based on VR and GIS
Authors: Zhu Bing Si , Bi Fang
Published: February 2012

This paper is focus on visualization technology in the application of urban planning. The 3D urban planning system is realized for planning design and exhibition. The author has made a small attempt in the field of urban planning visualization. Some techniques based on experience before can be shown intuitively in 3D urban planning system. This system has a very important significance and application value for increasing urban planning design level and research on rebuilding of the old cities. However, 3D urban planning system as a new technology platform has just begun in the field of application science. It is also a bold attempt, and there are many problems to be resolved in the techniques and methods. Of course, we can believe that 3D urban planning system will add a brilliant for urban planning.
Fracture Model of the Failure Wave in the Shocked Brittle Materials
Authors: Yao Guo Wen , Zhou Zheng Jie , Feng Xiao Wei
Published: February 2012

A new failure model was developed to describe the failure wave formation and propagation in shocked glass. The progressive percolation of microcracks into the stressed body gives rise to the failure wave phenomenon which could be regarded as a diffusion process. The propagation of failure front is governed by a nonlinear diffusion equation. The dynamic damage constitutive relation is built up to compute the stress state in the material through the failure process. Numerical results are presented and compared to lateral stress gauge measurements in shocked glasses. It is shown that the proposed model can capture the essence of the failure wave phenomenon.
Experimental Study on Compressive Behavior of CFRP Confined Concrete Columns
Authors: Ma Wei Hua , Kang Hong Zhen
Published: February 2012

Compressive tests of 30 concrete column specimens with three concrete strength grades are carried out in this paper to study ultimate compressive strength of specimens. The specimens are divided into three groups, that is, unconfined, confined by CFRP with no initial compression and confined by CFRP with various initial compressions. The different initial compressions’ influence on ultimate stresses and strains are investigated. The decrease of CFRP reinforcing effect due to pre-compression are analyzed. The research results provide experimental datum for reinforced design of existing concrete columns.
Shaking Table Test Study on Mid-Story Isolation Structures
Authors: Jin Jian Min , Tan Ping , Zhou Fu Lin , Ma Yu Hong , Shen Chao Yong
Published: February 2012

Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with lead rubber bearing are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.
Forecast on Payback Period of Restaurant Projects Investment by Computer Simulation
Authors: Zhang Meng Fang , Huang Liang , Cai Yi Ping
Published: February 2012

Investment projects of the civil engineering have many characteristics,such as large scale of construction,tremendous investment cost,long payback period of investment, and bad risk. For investors, the investment payback period of construction projects is an important index that evaluate and measure economic effect of project investment. The investment capital can be recovered in the operation of actual projects by the influence of random factors, it is difficult that the investment payback period of construction projects is calculated generally using analytic method. Combined with restaurant project in this paper, set up the mathematical model of the payback period of investment, find out random factors that influence its cash flow of restaurant project, to research and measure the data of random factors on existing similar projects, to determine the probability distribution of random parameters,and Statistical data processing, make use of the computer simulation, set up the simulation model of the payback period of investment, to forecast the static and dynamic payback period of construction projects,provided decision-making with scientific base and meaningful reference.
Research on Random Continuous and Cellular Green Concrete
Authors: Guan Bin Jun , Xing Shuang Jun
Published: February 2012

To the question of high alkali environment of green concrete caused by the cement hydration products, some measures such as optimizing the mixture ratio of concrete, reducing the total amount of cementing material, mixing with fly ash were taken on to decrease the high alkali of green concrete. The Experiments showed that the random continuous and cellular green concrete was a new-style ecological green concrete which combined with cellular concrete and alkali resistance of green plants. It had some performances such as convenient construction, low cost and it was suitable for large and rugged green area.
Research on Establishment and Analysis of the System of Affordable House Supply System
Authors: Liu Hong Yong , Zheng Jun Wei
Published: February 2012

The plan of “12•5” reflects the importance of the people’s livelihood, and the congress put forward to some measures about housing safeguard. When the central government vigorously promotes the policy of housing, it analyzes the group game among the large listed companies, the local government and the central government to obtain that the large listed companies can gain the benefit from the field of economically affordable housing and capped-price housing, analyzing the cooperative game among the state-owned enterprises, advising the government can cooperative with the state-owned enterprise to build the rental housing and mutually surrender part of the profits based on the credible commitment and the precondition of a series of preferential policies about tax reduction, analyzing the expectation of the consumer about buying or renting and the expectation of the company about the building of rental housing or the general commercial house to obtain that the consumer like to rent a house firstly and adjust their psychology, entering into the model of renting firstly and buying secondly. Establishing the system of housing safeguard with the above-mentioned analysis based on the game theory, the system of housing safeguard is improved with the adding of the large state-owned, privately-owned listed companies and the state-owned enterprises to provide a reference for the construction of housing safeguard.
Study on the Relationship between Factor of Safety and Angle of Dip of Bedding Rock Slope when Exposed to Reservoir Water Level Fluctuation
Authors: Li Yao , Wang Shu Ping , Zhang Zhen Hua , Li Shao Jun
Published: February 2012

The impoundment and running of Three Gorges Reservoir makes the water level fluctuate between 175m and 145m, and the water level fluctuation has been leading to the seepage field variation of bank slopes, which will bring out the stability change of bank slopes. In order to obtain the relationship between the angles of dip and factors of safety of bedding rock slopes which are generalized slope models from some bedding rock slopes failure in some reservoirs, the finite element method based on Darcy seepage theory was taken to simulate the seepage field variation of this type of bedding rock slopes when exposed to water level fluctuation, then the underground water tables of the bedding rock slopes with different angles of dip were obtained, finally the factors of safety of bedding rock slopes when water level rose and fell at speed of 0.2m/d were calculated by limit equilibrium method. Through the regulation analysis of factors of safety with the increase of angles of dip of bedding rock slopes when exposed to reservoir water level fluctuation, the relationship between factors of safety and angles of dip of bedding rock slopes was obtained.
Analysis of the Damage of Decompression Cone’s Column in the Silos
Authors: Wei Ying Le
Published: February 2012

In the cement silos of a factory, decompression cone’s column have a lot of damage in the process of using, which occurred mainly in the form of vertical, crossing, horizontal cracks or partial crush, according to the scene of the accident situation. Therefore, we put forward a set of approximate calculation method, and find out that the main reason is the insufficiency of the bearing capacity in original design.
Research on Short Term Flexural Stiffness of Concrete Beams with High Strength Steel Bars
Authors: Zhou Jian Min , Chen Shuo , Wang Xiao Feng , Zhao Yong , Tan Yun
Published: February 2012

Several batches of reinforced concrete (RC) and prestressed reinforced concrete (PRC) beams with 500MPa steel bars were tested in Tongji University, recently. The results indicated that the development of flexural stiffness after concrete cracking was influenced mainly by three parameters including initial elastic flexural stiffness, longitudinal reinforcement ratio and load level. Based on our 20 years' systematic research on crack and stiffness, a simpler unified formula is suggested after theoretical analyses for predicting short term flexural stiffness of concrete beams using high strength steel bars. Comparison with calculations from different codes at home and abroad exhibits that the suggested formula is precise and practical for both RC and PRC beams.
Compound Modified Asphalt Performance Research
Authors: Yi Wen , Hu Huai Wei , Wang Yong He , Qu Chang Zi
Published: February 2012

The scrap rubber powder and the waste plastic compound modified bituminous mixture are used in the first-class highway asphalt concrete pavement. They can not only reduce the environment pollution, but also enhance the operational performance of bituminous pavement. It has the economical, social and the environment three aspect remarkable benefit. This article uses the appraisal system of the rubber asphalt to test the compound modified asphalt performance with the different rubber powder quantity and the waste plastic quantity in different mixture temperature and the time. By text, we can determine the best quantity of the waste plastic.
Study on Semi-Rigid Roadbase Material Diseases Damage
Authors: Zhang Feng Chun
Published: February 2012

Abstract: the cracking of semi-rigid material may be believed for fatigue damage, temperature and dry shinkage, from above the analysis, and based on the disease prevention of the semi-rigid pavement, some treatment measures have been devoted, this study results for the semi-rigid material can provide a better technical support.
Research on Blasting Vibration Safety Assessment Parameters
Authors: Chen Ming , Lu Wen Bo , Shu Da Qiang
Published: February 2012

Based on the fluctuation or vibration failure mechanism of structures under blast vibration, the relationship between the amplitude, frequency of blasting vibration and the stress, strain (deformation) of structures is studied. The assessment method of blasting vibration effects is determined. The results indicate that under the fluctuation failure mechanism, the peak stress and strain of structures are proportional to the peak particle vibration velocity. The peak particle velocity (PPV) can be used to evaluate blasting vibration effects, while under vibration failure mechanisms, PPV, the main frequency and the natural frequency of structures must be considered for blasting vibraton effect safety assessment. The peak particle vibration acceleration should not be a separate evaluation parameter for blasting vibraton effects.
Improved Knapsack Problem Algorithm Based on Greedy Strategy for Tower Nesting
Authors: Cai Li Bin , Wei Shen , Yuan Jing Hua , Li Li
Published: February 2012

Tower nesting is a classic NP-hard problem, which is always solved in manual method or manual method combined with computer in production practice. The manual method is inefficient and impossible to process large amount of data accurately. Furthermore, the utilization rate of materials is not satisfactory. In this paper, we present a strategy based on an improved greedy algorithm to solve the nesting problem. Experimental results show that this algorithm has advantages of time efficiency and utilization rate of material.
Advanced Analysis of Staggered Truss of Steel Structure
Authors: Yang Wen Wei , Zhou Xu Hong
Published: February 2012

Based on refined plastic hinge, this paper considers the effects of second-order effects of structure plastic strength, geometric imperfection ,residual stresses to the structure stability by modifying the element stiffness matrix. Use the modified element stiffness matrix to analyze the force of the staggered truss of steel sturcture and compare the calculation results with ANASYS’s. Use the modified element stiffness matrix to analyze interstory drift of the staggered truss of steel sturcture and compare the calculation results with K Jim’s. The result shows that the developed element matrix can accurately calculate the stability capacity and interstory drift of the staggered truss of steel structure. Design by advanced analysis method is the direction of the analysis and design of modern steel structure.
Softening Curve of Dam Concrete by Inverse Analysis and Size Effect of Softening Curve
Authors: Zhao Zhi Fang , Wang Qiu Yu , Yang Zhi Hua , Yang Yang
Published: February 2012

The softening curves of four groups specimens with different sizes were obtained by inverse analysis based on the fictitious crack model（FCM）and the P-CMOD curve achieved by a three-point bending notched beam (TPB) test. According to the softening curves obtained by inverse analysis, size effect of softening curves was investigated，which shows both the tail of calculated softening curve, namely the maximum crack width wcand fracture energy GFhave an increasing trend with the increase of the specimen size, but no longer to increase when the specimen size attains to a certain level.
Experimental Study on Seismic Behavior of Cold-Formed Thin-Walled Steel R.C.Shear Wall
Authors: Xu Ming , Yao Yong Qin , Chen Liang , Chen Zhong Fan
Published: February 2012

CTSRC (cold-formed thin-walled steel reinforced concrete) shear walls system studied herein is made up of cold-formed steel and concrete. Five shear walls were tested quasi-statically under low cyclic lateral loads. The characteristics including failure modes, hysteretic characteristics, ductility and stiffness degradation are investigated. Analytical result indicates that, the CTSRC shear wall structure possess adequate bearing capacity, good seismic performance and high ductility. Stirrup ratio of the restrained side columns had no significant influence on wall’s bearing capacity, but walls with higher stirrup ratio show higher ductility.
Flexural Strength and Stiffness of High Strength Concrete Beams with Exposed Main Steel
Authors: Azizipesteh Baglo Hamid Reza , Raoof Mohammed
Published: February 2012

In a number of previous publications, results were reported for a series of extensive and carefully conducted tests on large scale reinforced concrete (R.C.) beams with various extents of loss of concrete cover and exposure of main reinforcement along their spans, with such areas of simulated damage being located within their regions which are dominated by either shear or flexure. These tests on R.C. beams made with normal strength concrete have covered a wide range of first order beam design parameters, with their results used to verify the generality of various theoretical models. In the present paper, much attention will be devoted to various structural characteristics (such as ultimate strength, flexural stiffness, etc.) of similar damaged R.C. beams with the proviso that, instead of the previously used normal strength concrete, the beams are made with high strength concrete. No such results (for high strength R.C. beams) have previously been reported in the public domain.
Research on Peak Stress of CFRP Confined Concrete Columns under 2 Times Compression
Authors: Ma Wei Hua
Published: February 2012

Three series compressive tests of concrete columns, CFRP constraint concrete columns and CFRP constraint concrete columns under compression are carried out to study the influence of initial stresses on strengthening effect. Through comparing the data of experiments, initial stresses’ influence on stress peak of 2 times compressive specimens is analyzed and the calculating formula of peak stress is proposed considering the pre-compression ratio, aiming at providing experimental dependences for strengthening design.
Research on Denoising of GPS Data Based on Nonlinear Wavelet Transform Threshold Method
Authors: Yuan De Bao , Cui Xi Min , Wang Guo , Jin Jing Jing , Xu Wan Yang
Published: February 2012

Signal denoising is one of the classic problems in the field of signal processing. As a new kind of signal processing tool, the good denoising performance of wavelet analysis has caused public growing concern and attention. The paper does systematic research on nonlinear wavelet threshold denoising method. And the wavelet denoising method has been used on GPS signal, and good results have been achieved.
A Research on the Change Law of Small Wastewater Amount
Authors: Shi Ming Yan , Gao Yan
Published: February 2012

In order to frame a perfect formulation called ‘The rule of small sewage amount treatment engineering design’, it has been investigated into the life wastewater discharge in some typical residential areas in Nanjing and Yangzhou, China. Also, the effect of economy level on daily discharge amount of life wastewater has been investigated. During the investigation, the effects made by temperature and economy level on daily discharge amount of life wastewater are emphasized. And the results show that, the hourly and daily fluctuations of life wastewater discharge are closely related to people's life habit, temperature and income level.
Based on the Series System Initial Tunnel Lining Supporting System Reliability Analysis
Authors: Chen Si Yang , Li Zhong , Zhu Yan Peng , Zhang Tian Yu , Ou Hua Wen
Published: February 2012

For the initial lining structure of tunnel , constructing an consider integrated safety factor function.Consider the initial shotcrete tunnel support structure as a series system, using the interval estimation of the "wide boundaries of law" system of tunnel lining structure analysis, on this basis to determine the system failure mode. Using the limit displacement under the condition of axial force and bending moment of the corresponding displacement and construction monitoring of displacement are analyzed, considering the material properties, geometry and random effects. Using the Monte Carlo finite element method, combined with a typical project example to tunnel structural system reliability index were calculated. The calculation results show that in the engineering example, tunnel lining structure in some local section of the reliability index is smaller, but the whole support system reliability indexes meet the design requirements, the whole tunnel lining structure in a safe state.
Campus Planning and Design Research Based on College Students' Happiness Rating - Case Study of Shandong Jianzhu University Campus
Authors: Zhang Jun Min , Lu Jing , Sui Wen Jun
Published: February 2012

Combining the study of college Students' happiness，this text establishes a set of campus planning and design evaluation system related to college students' happiness degree from the perspective of student's personal use. Also a practical example is evaluated.
Highway Construction under Land Restriction and Space Development along Lines -Exemplify by Shandong Province
Authors: Zhang Jun Ming , Zhang Yu Min , Liu Zhao De
Published: February 2012

China has in a stage of rapid development, Land occupation of urbanization is traffic and urban construction, while the contradiction of land resource utilization that brought about by large-scale construction of highway becomes more and more obvious. This paper takes Shandong as an example, shortland resource as the background, analysises the feasibility of large scale construction of highway in the prospect of transportation efficiency and land supply. From regional urban system development, it analysises the important impact of expansion in urban built-up area and space layout, and distribution of GDP-scale, to illustrate the highway construction can bring about the tendency of flatten development in region stronger. It concludes that Shandong should control the moderate scale of highway, improve comprehensive benefit, pay close attention to the development of cities along lines, prevent disordered spread, adopt metropolitan area development strategy, save resources.
The Significant and Acceptable Features of Urban Public Vehicles for Travellers in Terms of Urbanization
Authors: Kohzadi Seifabad Omran , Ismail Amiruddin , Matinrad Samira , Hafezi Mohammad Hesam
Published: February 2012

Good decisions about transportation investments and policies require accurate information to the characteristic of transportation system alternatives that are acceptable to individual and social are most important and necessary to identification and consideration. The primary aims of this research are to clarify the relationships between urban vehicle’s traits that are acceptable for individual and social from urban planning perspective. The study finds that are acceptable vehicle’s characteristics and do effects on individual or traveller include travel time, travel costs, safety and security, convenience, available and assurances. It is worth mentioning factors such as climate, geographic location, cultural factors and economic status are factors that will be affecting on the urban transportation traits from individual and society perspective. Methodology of this research is on based of field study (field observation, data collection, take photo and some interview) and library study (literature review, study about title and else). The study wants to do discuss via analytically and descriptively methods. The aims here are to gain a better understanding of the variables that effect on the acceptable urban vehicle traits for individual. Therefore, research will focus on identification and consideration of most important traits of the urban vehicles that is acceptable for the passenger or individual perspective. This is not only solving way to global problems about urban vehicle's traits from individual and society perspective because of various factors with different traits will become in order to play.
Design and Implementation of Combined Temporary Road and Permanent Road Construction
Authors: Guan Bin Jun , Xing Shuang Jun
Published: February 2012

Through designing of combined temporary road and permanent road construction, analyzing the main existed problems and providing the relevant measure, the case of implementation of a new large workshop district is introduced. It is favorable to rationally use of the existing resources, save construction investment and construction time.
Look from Ningbo Laowaitan Block of Renovation and City Design of Modern History Block in Ningbo
Authors: Xing Shuang Jun , Wang Ya Sha , Guan Bin Jun
Published: February 2012

Ningbo Laowaitan block was one of the most famous modern history blocks in Ningbo city. The regeneration and renovation of Ningbo Laowaitan block had important effect to Ningbo city construction. Under the double pressures of city history preservation and high cost commerce operation, the urban designs has been applied a lot of methods, such as style of protection and rehabilitation, style of implantation and collage during the regeneration and renovation of such historical block. A multiple city space has been made by a series of contradictions and opposition.
Research on Effects of Urban Space on Economy and Society
Authors: Ji Lei , Huang Jiang
Published: February 2012

The internal energy of urban development is the improving society and economy. Thus, the planning of urban space should be based on the study on the development of society and economy, which guarantee the scientific. Moreover, space has obvious effects on the social development, human activities and economic operation. The article makes a research on the effects of urban space on economy, society and human activities while attaching importance to the planning of urban space within the background of economic globalization, informatization and sustainable development.
Land Use Assessment Model of the Development of Low-Slope Hilly Land and its Application of the Changjiang Delta Region of China
Authors: Huang Shan , Chen Qian Hu
Published: February 2012

Based on describing the environment characters of Low-slope hilly land of the Changjiang Delta Region of China and the development problems in Zhejiang Province, an optimized model of suitability assessment of urban land use was supplied. With this model，an ecological security threshold was set by using pass/fail screening. Furthermore, a comprehensive evaluation index system was established using documentation, GIS analysis to lay of all single factor assessment layers，map of suitability assessment of urban land use could be generated, and then using land consolidation engineering calculation to extend and revise the assessment unit. It is concluded that the optimized model is more pertinent and enhance the rationality and can contribute to other similar areas in Asia.
Effect of Loading Rate on the Bonding Strength between Rebar and Concrete
Authors: Yan Dong Ming , Chen Gen Da
Published: February 2012

In this study, the effect of loading rate on the bonding strength between rebar and concrete substrate is investigated through pull-out test on 24 concrete cylinders. The load capacity, shear deformation and fracture characteristics of the interface are examined carefully. It is found that with the increase of loading rate, the load capacity increases correspondingly and their relationship can be characterized with a semi-logarithm equation. The load-deflection curves expand with the increase of loading rate, which is an indication of a gradually increasing energy absorption capacity with the increase of loading rate. Generally, with higher loading rate, more energy is dissipated.
Video Compression by Computer and its Application
Authors: Hu Yu
Published: February 2012

Future video compression algorithms may employ more adaptability, in this paper, we will focus on the block-based MC/DCT hybrid coding schemes, give a review of the technologies involved in predictive coding, transform coding, quantization and entropy coding, and based on this analyze the development trends and perspectives of video compression, highlighting problems and research directions. The rest of the paper is organized as follows. Development trends and perspectives of video compression analyzed in the following paper, highlighting problems and research directions are also analyzed.
In Situ FT-IR Studies on the Catalytic Reaction Kinetics of 1,2-Propanediol with Phenyl Isocyanate
Authors: Yang Peng Fei
Published: February 2012

Phenyl isocyanate is used to react with 1,2-propanediol in different temperatures. Toluene is used as solvent and triethylamine is used as catalyst. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction are calculated out, which are 74.1 kJ•mol-1, 71.3 kJ•mol-1 and -30.5 J•mol-1•k-1, respectively. They are very useful to reveal the reaction mechanism.
Investigation of Environment of Residential Districts “Zhongyi•Arkadia” in Zhengdong New Zone of Zhengzhou City in China
Authors: Zhu Li Juan
Published: February 2012

Through the investigation of landscape of “Zhongyi•Arkadia” in Zhengdong New Zone of Zhengzhou City, characteristics of its landscape environment had been summarized. The plants pattern, the square the diversified waterscape was the most characteristic landscape in the residential area. Meanwhile, it had found some insufficiencies. It was lack of native characteristic and landscape environments of other areas had been simulated blindly. Waterscape design had overlooked sustainability and overly emphasized artistry. It hoped to provide reference for planning design and construction of landscape environment in newly-built residential areas in other cities based on the investigation and analysis.
A Comparative Study on Environmental Behavior of Two Kinds of Typical Urban Plazas: Taking the Municipal Plaza and the Commercial Plaza in Jinniu District as Examples
Authors: Wang Wei , Dong Liang
Published: February 2012

The urban plaza is an important constituent of the big system of the city. It makes a prominent contribution to improve the overall environment quality of the city. With different users and using behaviors, the planning and design of urban plazas with different qualities are also different. Based on environmental behavior studies and POE (post occupancy evaluation), the present thesis takes the Municipal Plaza and the Commercial Plaza in Jinniu District as investigating subjects. From June 30th to July 10th in 2011, the investigation was carried out for user groups of different ages, different genders and different activity preferences during different time intervals in working days and at weekends. The researcher carries out a comparative study on using time features, user group features, spatial behavioral features of users, and activity expectations and behavioral modes of users. The researcher explains the importance of paying attention to spatial environment and the humanized design of user behavioral need. The researcher also points out its realistic significance for plaza construction in China.
Mechanical Behaviors of Structural Concrete Using Recycled Aggregates from Repeatedly Recycling Waste Concrete
Authors: Feng Jin Cai , Zhu Ping Hua , Xia Qun
Published: February 2012

This paper reports an expermiental study on mechanical behaviors of structural concrete using recycled aggregates from repeatedly recycling waste concrete. Five series of natural aggregate concretes with compressive strengths of 25MPa, 30MPa, 40MPa, 50MPa and 60MPa were used as recycled coarse and fine aggregates to produce recycled concrete with an objective compressive strength of 30MPa after they were cured for 28d. These recycled concretes were used as aggregates to produce concrete with the same objective compressive strength of 30MPa. The cycles were carried on until the indices evaluating the quality of recycled coarse or fine aggregate exceeded the tolerance. The mechanical behaviors of these concrete were tested. The results indicates that that with the increase of the cyclic number, the mechanical properties of recycled concrete, including compressive strength, tensile splitting strength, modulus of elasticity, gradually stabilize after obviously decreaing in the first instance.
3D-Modeling and Numerical Analysis of Fracture Behavior in AFM-Specimen on Mixed-Mode I-II Loading Condition
Authors: Li Qing Fen , Zhu Li , Jin Guo , Cui Xiu Fang
Published: February 2012

The computational analysis of a three-dimensional (3D) finite element model of all fracture modes (AFM) specimen on mixed-mode I-II fracture was presented in this paper. The separated energy release rates (SERRs) along the crack front of the AFM-model were calculated by the modified virtual crack closure integral (MVCCI)-method and commercially available software ANSYS. The influence of finite geometry and loading angles on mixed mode I-II fracture was investigated.
Research on the Effect of Concentration and Type of De-Icing Salt on Concrete Salt-Scaling
Authors: Li Qiang , Zhou Zhi Yun
Published: February 2012

To study the effect of concentration and type of de-icing salt on salt scaling based on the mechanism of glue spaling proposed by John J. Valenza II and George W. Scherer, the de-icing solution of NaCI andCaCI2 on the concentration of 1%、3%、5% and 7% were frozen into brine ice . Order to obtain the relationship of elastic modulus between the type and concentration of de-icing ,all brine ice specimens were tested under uni-axial compressive loading. The test results show: with the increase of concentration, the elastic modulus and peak stress of bring ice were decreased;when the same concentration ,the elastic modulus and peak stress of NaCl brine ice were higher than CaCI2.Based on the test results ,a reasonable explanation of the following phenomenon were given:The different type of de-icing salt all can lead to salt scaling of concrete;when the concentration of de-icing salt is moderate,it is will occur the most serious salt scaling.
Diagnosis of Current Employment in Architectural Student Responding to Korean Construction Market
Authors: Kim Sang Chul , Lim Jae Hyun , Park Jun Ho , Jung Tae Hwa
Published: February 2012

Construction market in Korea has been decreased for 3 or 4 years, and it brought the problem in supply and demand of workforce. Therefore, new workforce in construction industry could not been enter, and some of them have been employed in non-major area. This research intends to analyze construction industry as well as demand and status of construction companies and to diagnose status of new workforce for architectural works, and a survey is conducted for enrolled students and graduates to diagnose problems of current status in order to suggest the alternatives in Korea.
Influence of the Operating Temperature on the Ultrafine Grinding in Superheated Steam Jet Mill
Authors: Li Xue Lin , Li Jun , Niu Yun Hui , Qiu Tian
Published: February 2012

Effects of operating temperature on the fineness and yields of the ultrafine circulating fluid bed fly ashes (CFBAes) have been studied. Results show that the temperature of selection zone increased faster than that of crushing zone. Introduction of secondary air decreased the temperature of crushing zone, which would make the classifier invalid. Also, ambient temperature and insulation measures have a great impact on the ultrafine grinding in superheated steam jet mill
Demonstration Project Analysis of Energy Saving Renovation for Existing Building
Authors: Wang Ling , Tian Wen Ling , Zhang Yi , Chen Pei
Published: February 2012

Building energy efficiency is quite important for the sustainable development of our community.Based on the analysis of the building environment,building envelope,energy consumption of existing buildings and the economic condition of the region in Tangshan,the energy - saving renovation measures of building envelope and heat supply system is decided. Then the energy consumption of the energy - saving renovated building is analysed to verify the renovation results. The measures proposed can be one solution of energy-saving renovation in north region.
The Analysis of Coupled Heat and Moisture Transfer in Building Envelop Based on Numerical Simulation
Authors: Yu Shui , Zhang Xu
Published: February 2012

The research of coupled heat and moisture transfer is a complex process, which is the fundamental of decreasing building energy consumption; improving IAQ and increasing the durability of building envelop. CHAMPS-BES software is an outcome of a joint effort between Building Energy and Environmental Systems Laboratory (BEESL) and Institute for Building Climatology (IBK). This software is used for analysis and prediction of hygrothermal performance of building enclosures; impact of outdoor climate and pollution on indoor environment; impact of VOC emissions from building materials and indoor furnishings on indoor air quality. This paper introduces the basic mathematic and physic model, boundary condition, climate condition etc, and analyzes the coupled heat and moisture transfer through common structure of building envelop in Shanghai. According to simulation results, main materials of the wall in ITIS have to endure larger range of temperature than ETIS that leads to the life of materials shorter. Capillary condensation occurs on inside surface of the wall easily when RH is larger than 70% and the minimum pore size of finish layer is around 5×10-9m avoiding capillary condensation and mold growth
Diagrid Structures for Complex-Shaped Tall Buildings
Authors: Moon Kyoung Sun
Published: February 2012

Diagrid structures are widely used for today’s tall buildings due to their distinguished architectural aesthetics in any existing urban context and structural efficiency in carrying lateral loads. With prevalent emergence of complex-shaped buildings throughout the world, this paper investigates structural efficiency of diagrid structures employed for complex-shaped tall buildings, such as twisted, tilted and freeform towers. For each complex form category, tall buildings are designed with diagrid systems, and their structural efficiency is studied in conjunction with building forms. In order to investigate the impacts of various important geometric configurations of complex-shaped tall buildings, parametric models are generated using appropriate computer programs, and the models are exported to structural engineering software for design and analyses. Based on the study results, structural efficiency of diagrids for tall buildings of each complex form category is estimated.
The Modeling of TEM Responses Simulated by Multi-Transmitter
Authors: Tang Xin Gong , Hu Wen Bao , Yan Liang Jun
Published: February 2012

Using one or two electric dipole transmitters in the Controlled source electromgnetic method, this paper calculate the transient electromagnetic responses of one and two 3D conductive anomalous bodies in the layered earth by varying the number and intensity of the dipole sources. The results of the models show that satisfactory resolution can be achieved when only one dipole source is used. The stronger the intensity of the electric dipole source, the better resolution for the anomalous body for the same offset. When two electric dipole transmitters laid each side of one 3D body, it means that the anomalous body locates in the middle of the sources and the resolution to the target becomes poor. The numerical results of the transient electromagnetic responses of two 3D bodies also support the idea that resolution is not good when two transmitters are used in each side of the targets simultaneously. As the conclusion, in order to get good resolution to the target, multi transmitters laid different side of the geological target should not be used the same time in the field survey.
Influence of Permeated Crystalline Materials on Durability of Hydraulic Concrete
Authors: Wang Ke Liang , Hu Ting Zheng , Liu Ling
Published: February 2012

Influence of permeated crystalline materials on durability of hydraulic concrete was studied by impermeability test methods after sulfate attack and freeze-thaw cycling. Microstructure of concrete was analyzed and characterized with SEM and MIP. The results showed that impermeability pressure of concrete with permeated crystalline materials was more than that of standard concrete after sulfate attack and freeze-thaw cycling. Permeated crystalline materials improved on performance of concrete for sulfate attack and freeze-thaw, because that microstructure of interfacial transition zone of concrete with permeated crystalline materials was compact and its pore size distribution was more than that of standard concrete. There were more content of less harmful pore with diameter 20nm~100nm and less content of harmful pore with diameter100nm~200nm and more than 200nm in concrete with permeated crystalline materials than in standard concrete.
A Resonant Gas Sensor Based on Micro-Cantilever
Authors: Li Shuang Mei
Published: February 2012

The static and dynamic properties of the mcrocantilever are presented in this paper, which provides theoretical ways to improve the sensitivity of mcrocantilever. Two methods of resonant excited and detecting mechanism are analyzed with examples. The probabilities of applying these mechanism in gas sensor are also discussed.
Effect of Interface Elastic Modulus on Damage Mechanism of the Fiber Reinforced Concrete
Authors: Tu Xiao Qing , Zhang Ya Fang , Liu Hao
Published: February 2012

This research focuses on the interface’s impact on the macro-mechanics and damage mechanism of the fiber reinforced concrete (FRC). In consideration of the mesoscopic nonhomogeneity of the interface, numerical test has been adopted to simulate failure procedure of fiber reinforced concrete samples. It can, therefore, be concluded, that, the interface elastic modulus have a great impact on the macro-mechanics of the FRC. With interfaces added into FRC, failure could present ductile properties, cracks could be developed horizontally, and then unbonded and slid along the interface. During the process, phenomenons such as interface debonding and sliding, crack deflection, fiber bridging and pulling out could be clearly observed. Under With the premise that strength for interface is adequate for stress transferring, the toughness of the FRC would be enhanced by the interface.
Research on Sustainable Development of Residence in Northwest China under the Urbanization Process
Authors: Jin Yi Bing , Zhang Cai Qing
Published: February 2012

The article is based on the circumstances of urbanization in process in Northwest China. The problems in the construction of village houses are analyzed and the rational strategy regarding the urbanization and its influence on constructing houses, so that the problems once harassed the developed area can be avoided. After through investigation and analysis, we propose that the local construction in the context of urbanization should conform to the following principles: First, house construction should go with the resource and technological condition. Second, the construction should accord with the climate and environment. Third, the reasonable principle uses the land. Last, Integration of architecture and green ecological technology. The synthesis of the four principles above is the apt choice of constructing residence in Northwest China, which is expected to lead the local village living environment onto a sustainable path.