bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study of the Tensile Bond Strength in Concrete Aggregate - Paste Interfacial Transition Zone
Authors: Pei Chao Wu , Yao Yong , Chen Dai Guo , Jia Bin , He Li Jun , Zhang Jiu Li
Published: August 2012

Study on the characteristics of tensile bond strength in concrete interfacial transition zone. Calculate the tensile bond strength of interfacial transition zone in concrete by the way of vertical drawing cobblestones of different grain size from C30 concrete by MTS hydraulic loading system .(the grain size include 50,70,90,100mm) results show that:1.when the cobblestones diameter is in a certain range(<90mm in this experiment)or the bonded area is in a certain range(<5251 mm2 in this experiment), The tensile bond strength of concrete interfacial transition zone nothing to do with the cobblestones diameter and the bonding area.2.If the cobblestones diameter or the bonded area is too large, it will affect the bonding effect of the cobblestones and concrete, and cause the depression of tensile bond strength, Therefore , In the actual engineering we should avoid the use of large diameter cobblestones .3. The tensile bond strength of C30concrete interfacial transition zone is approximately 4% - 10% of compressive strength of concrete.
Application Research of Prestressed High Strength Concrete Pipe Pile in Construction
Authors: Wu Zhi Peng , Yang Xue Dong , Bao Lei
Published: August 2012

Prestressed high strength concrete pipe pile (PHC pile), a new type of pile, due to outstanding performance, widely used in various aspects of national construction, this paper introduces the development situation of prestress high strength concrete pile in our country, aiming at proposing own opinion in existence question in the construction process of high strength prestressed concrete pipe pile.
Analysis on the Seismic Behavior of Extended End-Plate Connections of Steel Frame Structure
Authors: Yan Zhu Ling , Cui Bao Long , Zhang Ke
Published: August 2012

This paper conducts analysis on beam-column extended end-plate semi-rigid connection joint concerning monotonic loading and cyclic loading of finite element through ANSYS program, mainly discussed the influence of parameters such as the form of end plate stiffening rib on anti-seismic performance of joint.
Study of Solar Energy Floor Heating System in Cold Climate Zone
Authors: Zhang Ye , Qi Dian Wei , Wang Wan Jiang , Lv Zhi Yuan
Published: August 2012

Urumqi locates in Xinjiang province, which belongs to cold climate zone in China, the local heating period during the winter up to 6 months. The local solar energy is abundant; up to 130-140 Kcal/cm2·Y that can provides advantage condition for utilization of solar energy. Floor radiant heating system requires lower supply temperature compared with the traditional heating system, which provides an advantage condition for using solar energy as heat source since it is already widely used in Urumqi. Based on these, the study established a solar energy floor heating system in XinJiang University. The system’s components, operating principle and indoor air temperature profile had been introduced in this paper. Through the experimental study the research results shows that 40% time of winter period in cold climate zone, the solar energy floor system can working well without any auxiliary heat source, the heat generate from solar collect system can satisfied the indoor heating requirement. The application of this system can make energy saving and environmental protection become true.
Seismic Performance of Existing R/C Frames Strengthened by Steel Plate Shear Walls
Authors: Valente Marco
Published: August 2012

This study investigates an innovative method based on low yield steel plate shear walls for seismic retrofitting of existing reinforced concrete (R/C) structures. A simplified numerical model of steel shear panels is developed for global analyses of multi-story R/C frames. The seismic performance of a non-ductile five-story R/C frame retrofitted with steel plate shear walls is evaluated in terms of drift control and energy dissipation capacity using nonlinear dynamic analyses. The results obtained by the application of two different story-wise distributions of steel plates are compared. In case of retrofitted frames a considerable decrease of the maximum top displacements is registered and the energy dissipated by the primary structural elements is significantly reduced for severe seismic actions. The energy dissipation concentrates in the steel panels, reducing the plastic demand on the structural members, along with the potential for structural damage. The different story-wise distributions of the steel panels change the damage distribution throughout the frame. The uniform arrangement of the steel panel thickness along the height of the frame causes a concentration of damage in the columns of the first story. In case of steel panel distribution proportional to story shear, the energy dissipation results more uniform over the height of the frame and a significant decrease of damage is registered for the columns of all the storeys.
The Energy-Saving Analysis of District Heating System
Authors: Yang Xian Liang , Chen Juan Juan , Shi Guo Hua
Published: August 2012

This paper introduces the adjustment curve equations of district heating system commonly used in secondary network. On this basis, adjustment curve equations of the adjustment that combines quantity adjustment and quality adjustment are proposed. Then taken a community in Zhangjiakou as an example, we compare the power consumption of the adjustment scheme proposed in the paper with that of quality adjustment and quality adjustment with different quantitative ratio in each period. The analysis shows that the adjustment scheme has much more potential in energy-saving.
A Study on Green Building Design of Huizhou Traditional Dwellings
Authors: Ji Wen Mei
Published: August 2012

The green building design of Huizhou traditional dwellings isn’t the same as their external shape being dominant character, but being implicit among building itself, environment and building fabric of enclosure structures. The article analyses excellent ecological design of Huizhou traditional dwellings from three different aspects, settlement’s interior ecological environment, external ecological environment and building fabric gene of rounding to protect structure. At last, it expects to distill all of them and plant into modern architecture in order to explore a road of innovation suitable modern design for Huizhou residential district.
Selection of Dominant Plants at the Road Green Space in Longyan
Authors: Lv Guo Liang , Hu Xi Jun , Li Xu Sheng
Published: August 2012

As liaisons between “green spots” and “green areas”, road green space in unban play a decisive role on the improvement of urban style. In this thesis, AHP is applied in the comprehensive evaluation and hierarchical classification to the 198 types of garden plants in Longyan city. Based on evaluation results and the hierarchical classification, in the light of the characteristics of road planting and the present situation of Longyan, this thesis identifies the fundamental key tree species and backbone tree species of the unban road green space in Longyan to make contributions to the planning of tree species in Longyan.
Green Container Building’s New Design Concept
Authors: Wang Xue Ying , Wu Ya Jun , Xu Dong
Published: August 2012

The container building is emerging products on the container’s market. Container architecture reflects the low carbon building the "energy" and "low carbon" characteristics, it is sustainable. In the world, we hope a low carbon economy development, on this way, the design of the building with container transformation is a new design in the exploration of how to reduce building materials’ carbon emissions in the process. It emphasizes the construction of green concept container.
The Research on Heat Stability of Wood-Plastic Composites Added Four Different Stabilizers
Authors: Li Kai Fu , Xu Kai Meng , Xie Xue Tian , Xie Chen Ping
Published: August 2012

The influence of heat stability of wood-plastic composites (WPC) was researched effectively by adding the heat stabilizer composites of lead sulfate tribasic and dibasic lead phosphate, pure lanthanide, composites of zinc stearate and lanthanide and single BHT. The mechanism and factors of stability for different heat stabilizers were revealed by means of analyzing fourier transform infrared spectroscopy (FTIR). The result indicated that the rank of effective heat stability from high to low was composites stabilizer of lead, pure BHT, lanthanide added zinc stearate and pure lanthanide in sequence.
Research on the Centralized Procurement Mode of Construction Projects Materials
Authors: Li Li Xin , Zhang Yi Bo , Sun Hao
Published: August 2012

Aim: To strengthen management cost of construction projects, reduce procurement cost of materials, guarantee materials quality and to promote the profitability of the project. Approach:Adopt scientific centralized procurement implemented by construction enterprise headquarter.Result: It not only reduces materials procurement cost, but also improves the quality of procurement, which, guarantee the project quality and promote the profitability of both the project and the enterprise that carries it out. Conclusion: The centralized procurement mode of construction project materials can effectively reduce construction cost and promote the profitability of both the project and the enterprise that carries it out.
Measurements of VOC Emission from Polyurethane Varnish for Interior Use
Authors: Chen Jing , Zhu Neng , Shi Xin Li
Published: August 2012

The emission of volatile organic compounds (VOC) from single-component polyurethane varnish applied to beech plywood at two temperatures (33°C, 43°C) has been investigated in a small environmental chamber. The experimental results indicated that the concentration of each compound, as well as the total volatile organic compounds (TVOC), increased rapidly after the start of experiment, and attained their maximum values at 0.5 h. The concentrations decreased rapidly after 0.5 h, and then decreased more slowly in the period 2 – 24 h. The concentrations of isopropylbenzene, n-decane and TVOC were higher in the 43°C test than in the 33°C test within the first 1.5 h. The influences of temperature on the concentrations of these pollutants were different during the period 1.5 – 24 h.
Discussion of the Fireproof Wall Insulation Materials
Authors: Yao Hong Bo , Zhang Da , Zhu Wei
Published: August 2012

This article put forward several suggestions for the design of new type of fire insulation materials, and cited several new types of fire protection materials; advocate the use of fire insulation materials to prevent fires from the material roots.
Green Roof as a Green Material of Building in Mitigating Heat Island Effect in Taipei City
Authors: Sun Chen Yi , Lin Yi Jiung , Sung Wen Pei , Ou Wen Sheng , Lu Kang Ming
Published: August 2012

A large amount of research has been published in Taiwan on the reduction of the urban temperature for different strategies. The most important strategy for reducing ambient temperature is increasing green space in city. For analyzing the effect of the vegetation on the thermal environment, this paper collects temperature data from one green roof and one normal roof which are belong to a same office building to analyze the thermal influence of vegetation. The result of this research shows that in summer the maximum cool effect of green roof was -1.60 oC and -0.26 oC in average. Therefore, it can also provide useful data to governments for calculating the environmental benefit if they carry out a green roof policy in mitigating heat island effect in the future.
A New Type of Superplasticizer Performance and Applied Research
Authors: Ma Xiao Qiu
Published: August 2012

In the laboratory synthesis a colorless superplasticizer , through to the mixed quantity of it, whiteness value, decrease water rate and the strength of the performance test, get: this colorless superplasticizer excellent performance, accord with concrete superplasticizer performance index, and applied to the decoration of concrete flip chart, and good results have been achieved.
Strength and Resistance of Alkali-Activated Slag Concrete to High Temperature
Authors: Chi Mao Chieh , Huang Ran , Lu Wei Hsin
Published: August 2012

This study presents an investigation into high-temperature resistance of alkali-activated slag concrete (AASC). Sodium oxide (Na2O) concentrations of 4%, 5% and 6% of slag weight and liquid sodium silicate (SiO2) with modulus ratio of 0.8 ( mass ratio of SiO2 to Na2O ) were used as activators to activate granulated blast furnace slag (GBFS). All cylindrical specimens with the same binder content and liquid/binder ratio of 0.5 were cast and cured in the air, under the saturated limewater and in a curing room at relative humidity of 80% RH and temperature of 60 °C, respectively. Test results demonstrate that the high-temperature resistance of AASC decreased with an increase of temperature. The compressive strength and high-temperature resistance of AASC improved with an increase dosage of Na2O and AASC cured at relative humidity of 80% RH and temperature of 60 °C has the superior performance, followed the AASC by air curing and saturated limewater curing. The higher compressive strength and superior high-temperature resistance have been obtained in AASC than comparable OPC.
Application of Energy-Saving Building Materials and Economic Comparison
Authors: Liu Zhong Min , Gao Wei , Ji Jing
Published: August 2012

This article introduces several common building materials and new-style energy-saving materials, and their advantages and disadvantages are given. Reactive power concrete and FRP reinforcement will be applied widely in actual engineering. Through specific examples engineering cost of energy-saving materials is introduced, finally gives the building developments and future directions, these can provide reference for application of novel materials in construction project.
Developing a Healthy, Comfortable and Energy-Saving Office Building
Authors: Sung Wen Pei , Chi Yi Rou , Hong Lin Jun , Zhao Yu Kuang
Published: August 2012

How to maintain a comfortable indoor environment without excessively relying on mechanical HVAC (Heating, Ventilation, and Air Conditioning) is a target to be pursued for future living requirements. The results obtained in this research show that in an office environment, the room temperature monitored during winter is close to the comfortable temperature; however, the office occupants feel that a little warmer indoor temperature is comfort. During summer, the occupants prefer cooler temperature than the comfort temperature. Additionally, Taiwan is located in sub-tropical region with hot and humid summer. Even if the room temperature is maintained in a comfortable range, the occupants still feel not so comfortable because of high humidity. Hence, reducing the room temperature below 23 °C is inferred to make occupants feel comfortable. Questionnaire survey indicates that ventilation is preferred by 30.9% of the respondents for summer and 43.3% for winter as an effective method to improve the stuffy indoor air.
Microcrystal Growth in Heat-Treating Process for Europium Ions Doped Aluminosilicate Glasses
Authors: Guo Wan , Zhao Xin , Jiang Shu Wen , Wang Zhi Qiang , Zheng Li , Liu Ming , Lin Hai
Published: August 2012

Eu doped YAG glass ceramics containing single phase of YAG micro-cryatals have been obtained by heat-treating the aluminosilicate precursor glasses. The primary crystallite size of YAG phase is calculated to be ~46 nm and the crystal grains grow with preffered orientation (444) in the internal network. The average secondary particle size is estimated to be ~8μm and the larger grain size is due to the particle aggregation. The pilotaxitic texture of YAG glass ceramics presented in SEM micrograph, can increase yield strength and tensile strength of the sample effectively. The emission spectrum of Eu doped YAG glass ceramics consists of a broad blue emission band and several narrow emission bands, indicating the coexistence of Eu3+ and Eu2+ ions in YAG glass ceramics.
Numerical Stimulation Method of Chloride Concentration in the Concrete Structure Exposed to Chloride Aggressive Environment
Authors: Huang Ying , Wei Jun , Dong Rong Zhen , Yan Hui Huang
Published: August 2012

In this paper, based on the similarity between chloride diffusion equation in concrete and heat conduction equation the thermal analysis module of the ANSYS finite element software was used to carry out the numerical simulation for chloride ion diffusion process in concrete. And the numerical results were compared with the analytical solutions of chloride diffusion equation, which showed that the method is effective for the chloride diffusion analysis. Time-dependence of chloride diffusion coefficient in concrete was considered by amending the chloride diffusion coefficient with various parameters. Finally it is a feasible method that the chloride ion concentration in concrete structures was calculated by thermal analysis module of the ANSYS.
Experimental Study on APP Modified Asphalt Felt Used as Interlayer between Old Cement Concrete Pavement and Asphalt Overlay
Authors: Yuan Yu Qing , Li Xue Chan , Guo Tao , Li Wei , Wang Liu Yang
Published: August 2012

To study the mechanisms and effects of atactic polypropylene (APP) modified asphalt felt preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, authors carried through the tests of level tension, field road, and direct shearing. A new test-bed machine, named level tension for interlayer, was developed, and its mechanical composition and work principle were also set forth. Using the new machine, level tension tests were conducted with APP modified asphalt felt as interlayer materials, which indicated that the test-bed has favorable mechanical behaviors and the felt has better performance to prevent cracks than any other materials. APP modified asphalt felt was applied to field road, moreover, its favorable interlayer bonding and working performances were proved by field drill cores. The direct shear tests accounted that the shearing destruction displacement comes to 7.5mm, 3.0mm more than that without the specific interlayer, with the cores from the road. The test results showed that APP modified asphalt felt has good road service performances, with evident effect of anti-cracking when it is used as an interlayer material between asphalt overlay and old cement concrete pavement.
Mechanic Analysis of Continuous Bridge-Deck Pavement on Curved Slope in Qinling Mountains Expressway
Authors: Xu Wei , Li Shan Qiang , Wang Xuan Cang , Han Rui Min
Published: August 2012

This paper introduce the innovative application of finite element method in bridge-deck pavement on curved slope. Based upon Xi’an-Hanzhong Expressway in Qinling Mountains, the developed combination of FE models, including the overall and sub-model, study loading response of bridge-deck pavement on curved slope, and relate the mechanical analysis to structural parameters.
Study on Microstructure of Soil Using MATLAB
Authors: Yu Chuang , Wu Li Cai , Chen Zhang Long
Published: August 2012

This paper analyzed the feasibility of study on microstructure of soil using Matlab, and based on the theoretical model , introduced the fundamental principles, method and detailed process of dealing with soil SEM picture by making use of Matlab. Finally, through the processing and analysis of the model picture, we make a further explain for the operation procedure and approach. From the analytical results, we can draw the conclusion that making use of Matlab to deal with the soil SEM picture can accomplish a convenient and accurate study of soil microstructure.
The Numerical Analysis on Stability of Deep Roadway Support System
Authors: Xiao Zhen Yan , Liu Yu
Published: August 2012

The effect of the roadway with no supporting and roadway that was reinforcement by rock bolts and anchor robs, anchor rod combined bolting shoring, anchor rod combined anchor rope and lining timbering was simulated by using numerical simulation software FLAC3D. The results showed that the deformation of no supporting roadway is maximal, and the maximal position is vault. The displacement of top floor and two side decreases after supported, which can reinforce surrounding rock. The reinforcement effect of the anchor rod combined anchor rope and lining timbering is best.
Decision Model of the Soft Ground Improvement Based on Improved Sugeno Fuzzy Integral
Authors: Zhu Yan Zhi , Zhang Chun Li
Published: August 2012

In order to completely consider affects of various subjective and objective factors for decision of soft ground improvement, according to quantitative index and qualitative index influencing soft ground improvement, a fuzzy integral decision model about definitive set was presented, based on improved Sugeno fuzzy integral on the basis of fuzzy measure. A computer program for applying the model to solve multi-objective decision making problem was given. The feasibility of its model was verified through the optimal choice for decision of soft ground improvement in practical engineering. The given example shows this model can be successfully used to make decision about soft ground improvement method of the expressway. At the same time, the decisional model above is useful and effective for evaluating the other complicated systems.
Seismic Response Analysis on Two-Tower Isolated Structure with Enlarged Base
Authors: Pang Ying Bo
Published: August 2012

In this paper, the three-dimensional finite element method has been adopted to respectively establish the base isolation of the two-tower structure with enlarged base and the story-isolated vibration analysis model. Each model has been conducted the elastic-plastic time-history analysis under the horizontal earthquakes. The results show that the dynamic characteristics of the structure have been significantly changed through the arrangement of isolation layer; the seismic responses, such as the story drift, the seismic shear and the acceleration of the structure, have been also greatly affected and the damping effect of the structure is obvious.
Characteristics of Shuiboxia Landslide Triggered by the 2008 Wenchuan Earthquake in China
Authors: Xia Min , Ren Guang Ming , Lv Sheng Di
Published: August 2012

This paper presents a case study detailing the characteristics and mechanism of Shuiboxia landslide revival induced by the earthquake located in Bailongjiang River, 700 m upstream of the Shuiboxia Dam, in North West of China. After the“5.12”Wenchuan earthquake, landslide revived entirely and downstream zone cracked quite evidently. Based on the regional geology background, detailedly researched the deformation and mechanism of landslide. The research manifested that landslide revival is attributed to cumulative effect of seismic shaking resulting in reducing of strength parameters of the sliding zone, deformation were affected by the landform and evident amplification effect of landslide under the earthquake. Numerical simulation adequately explained the mechanism of landslide revival.
Impacts of Additional Columns on the Vertical Dynamic Response of Mega-Beam in MSCSS
Authors: Yang Tao , Zhang Xun An , Lian Ye Da , Wang Xian Jie , Wei Zheng
Published: August 2012

In order to solve the long span problem of mega-beam, arranging additional columns in MSCSS(Mega-Sub Controlled Structure System).Calculating vertical displacement and acceleration response of the mega-beam,which under vertical seismic, in order to discuss the mega-beam dynamic response that changing location, quantity and contact type of the additional columns. The results shows that: additional columns arranged in the middle of mega-beam , controlling the mega-beam vertical dynamic response is better; compared to the number of additional columns,the location of additional columns has a greater effect on controlling the mega-beam vertical dynamic response; contact type of additional columns has a little effect on controlling the mega-beam vertical dynamic response.
The Design of Mix Proportion of High-Performance Concrete for Passenger Dedicated Railway Based on Overall Calculation Method
Authors: Xie Xian Song
Published: August 2012

The main structure of passenger dedicated railway serves in complex physical environment, so its high durability is expected. In contrast to normal HPC applications, higher requirements are addressed for the application in passenger dedicated railway, which include control of raw material quality, selection of HPC design strength, and mix proportion design procedures. In this paper, the choice of HPC constituents, the principles of mix proportion design, and the design of HPC mix proportion for passenger dedicated railway based on overall calculation method are presented. Its application case in Quzhou Section of the Hangzhou-Changsha Passenger Dedicated Railway has shown that t the design of HPC mix proportion for passenger dedicated railway based on overall calculation method is effective and deserves popularization.
Testing and Evaluation of Frictional Lose for Strand with Multi-Curves
Authors: Li Xiao Ke , Zhao Shun Bo , Jiang Long , Hu Zhi Yuan
Published: August 2012

How to determinate the pre-stressing losses is a key issue for the pre-stressed concrete structure design and construction. Especially for the major engineering projects, the actual value of pre-stressing loss should be detected in site to check or revise the original design parameters and keep the engineering in safety. Compared with the straight strand, the frictional lose between strand with multi-curves and ducts would occupy the most part of all losses. It is a crucial ingredient to determinate the pre-stressing losses. This paper introduces the detection and evaluation results about frictional loss of a typical pre-stressed concrete invert siphon with multi-curve strands according to Chinese specification. The testing procedure is given and a formula is derived to calculate the frictional lose for the multi-curve strands. Then a simplified method is advised to evaluate the friction coefficient and wobble factor. The results show that the theoretical values recommended in the code fit with the testing deductive values and prove that the given values of friction lose for the design are reasonable as well. The conclusions would serve as a reference for similar engineering structures.
Covering and Reinforcement Key Technologies of Airport Old Cement Concrete Pavement
Authors: Shi Bao Hua , Ning Wen Pu , Wang Han Wei , Sun Tao
Published: August 2012

Cement concrete pavements were used in most airports built early in China. Nowadays the main task of airports is how to cover and reinforce damaged pavements. To ensure the life-span of pavement after covering, on the basis of analyzing the treatment methods of original cement concrete pavement, cement and asphalt concrete were used to realize the covering and reinforcement of old cement concrete pavement, and key technologies of Preventing reflective cracks of concrete pavement were put forward, which had a good result in practice
Discussion on the Green Building Design
Authors: Huang Yan
Published: August 2012

As environmental problems have affected people's livelihood, in the widespread concern about the environment today, as the architects ,we should raise the banner of green building, energy conservation, taking in the whole society in the forefront of ecological design.In this paper, some of the common energy strategy for the design to the summary, and briefly explain how these design strategies is combined together with the ultimate form of organic architecture, thus which enhancing the sustainability and ecological building design for the practice of understanding.
Design and Stability Analysis of Latticed Shell Structure in Site of Tianluoshan
Authors: Du Wen Feng , Sun Zhi Fei
Published: August 2012

The design and analysis of the large span steel latticed shell structure in site of Yuyao TianLuoshan is introduced, and some key problems are dwelled on in this paper. By the geometrical nonlinear finite element method, the nonlinear stability analysis is carried out. The buckling modal and the whole course of instability are shown by two analysis method, the eigen-buckling analysis and the geometrical nonlinear finite element method. The influence of spring support to the stability of the structure is analyzed. It is shown that the structure has good wind-resisting capacity, which is fit to the circumstance near sea with lots of typhoon. Large compressive membrane stresses arise in the structure under the condition of temperature rise, leading to a significant reduction in the stability load-carrying capacity of the structure.
Study and Application of the Self-Compacting Recycled Pavement Concrete of High early Strength
Authors: Liu Qing Tao , Cen Guo Ping , Cai Liang Cai , Wu Yong Gen , Wu He Sheng , Liu Xiao Jun
Published: August 2012

This paper aimed at the problem of how to rapid repair the military airfield pavement after it be demolished. It adopted the coagulate faster and early strength special cement, superplasticizer and mineral admixture, used the demolished pavement made recycled aggregates, optimized the mix proportion design and studied the performance of self-compacting recycled pavement concrete of high early strength. The laboratory tests and used in field both indicate that the workability of the self-compacting recycled concrete is well, could be constructed conveniently, the 4 hours’ flexural strength after it mixed could achieve more than 2.5MPa and ensure one type plane take off safely, which could fulfill the technique requirements of rapid repair the pavement. The flexural strength could achieve more than 5.5MPa at 28 days, and the recycled concrete felt with the existent pavement well, which could fulfill the long-term requirements of airfield pavement, the concrete also could be used in the rapid repair the cement concrete pavement of civil airfield and highway.
Energy-Efficient Curtain Wall Design for Super High Rise Building — A Case Study on Curtain Wall Design of Guangzhou Fortune Plaza
Authors: Lin Yi , Fei Yan
Published: August 2012

Taking the curtain wall design of Guangzhou Fortune Plaza, a high-rise in Guangzhou, as example, this paper discusses the technical approach for improving energy-efficient performance of curtain wall in terms of energy-efficient glass selection, the design of external sun-shading elements and the construction detail that can facilitate the natural ventilation, so as to enhance acclimatization of curtain wall in Lingnan Area
Unified Design of Tensile-Compression Prestressed Concrete Structure
Authors: An Jing Bo
Published: August 2012

Structural characteristics of tensile-compression prestressed concrete are introduced briefly in this paper. Firstly, with current concrete structure design code（GB50010）, requirements for materials used in tensile-compression prestressed concrete structure are put forward; and for prepressing stress steel pipe, strength value and basic types for structure design are determined. Secondly the calculation method of prestress loss is given during each work stage of tensile-compression prestressed concrete; and the basic measures of cracking control are concluded. Thirdly, bearing capacity formula of tensile-compression prestressed concrete structure and stress checking formula of menbers in construction stage are provided. Finally structure design of tensile-compression prestressed concrete is unified
Research on Damage Identification of Suspension Bridge by Wavelet Analysis of the Strain Mode
Authors: Guan De Qing , Tang Qi , Ying Hong Wei
Published: August 2012

The suspension bridge contained damage was made as the object of study. Three different damage conditions for suspension bridge were calculated(conditions 1, the left midspan contains a damaged zone, condition 2, the left end bay contains two damaged zone, condition 3, both sides midspan contains a damaged zone). Using the wavelet analysis theory, solving strain modal parameters of the suspension bridge with cracks by means of Lanczos method. Then the cracks location of the suspension bridges could be identified by the maximum of wavelet coefficients. It can be concluded that the method using wavelet analysis of strain mode is more accurate and more effective through the calculation and analysis of the suspension bridge damage identification. The method can be useful in the suspension bridge damage identification and diagnosis.
Research on Applicability of Group Form Theory in Contemporary Urbanism: A Case Study of Hillside Terrace
Authors: Jin Shan , Chen Ke Shi , Tong De
Published: August 2012

In the rush for modernization, many of the Chinese cities are in the abrupt disappearance of character and identity of the unique places. Urban open space has lost its sense of place. This paper analyzes the applicability of group form theory within today’s dynamic environment by taking Maki’s Hillside Terrace complex as an example. The development of Hillside Terrace complex is resilient and adaptable to changes over time. It preserves the original spirit and character by creating urban open spaces for all kinds of human interaction. It provides inspiration for today's urban design.
Effect Factors of SHS Combustion System in Thermit Welding
Authors: Luo Chuan Hong , Liu Mao Pin , Mao Yan , Hu Tian
Published: August 2012

The combustion stability of the self-propagating thermit reactions was analyzed, and the influence factors on combustion temperature and combustion speed were discussed in detail. Especially, a complex combustion system had an advantage in balancing the reaction heat. Through the welding experiment and result discussion, the control strategy for heat was verified in the complex combustion system of (CuO+Al)+( CuO+CaSi). The results indicated that the optimization of particle size and content rate about oxidizing agent, reducing agent and additive components had a significant effect in stable combustion, heat uniformity, beautiful forming and so on.
Anisotropy of Mechanical Properties and Microstructure Evolutions of Tensile AZ80 Magnesiumat Room Temperature
Authors: Zhang Dan Dan , Li Meng , Xiao Ya Chen , Ping Yang
Published: August 2012

It is obviously different mechanical properties of the rolled magnesium alloy plate when stretched along different directions at room temperature. In this study, three groups of samples for uniaxial tension were cut from the as-rolled AZ80 plate with their tension directions either at 0°, 45°or 90°to the rolled direction (RD) of the sheet. Results show that the ductility of the 45°samples was significantly better than that of 0°and 90°samples. The electron backscatter diffraction (EBSD) technique was used to investigate the microstructure and textures evolution. Along with the increase of deformation, more low-angle grain boundaries arise in the 0°and 45°samples than the 90°samples. At the same time, the texture components that {10-10} prismatic plane perpendicular to the tension direction were significantly enhanced in three groups of samples.
Electrochemical Cycle Stability and Kinetics of the As-Cast and Spun La0.75−xZrxMg0.25Ni3.2Co0.2Al0.1 (x = 0-0.2) Alloys
Authors: Zhang Yang Huan , Zhang Guo Fang , Liu Xiao Gang , Chen Le Le , Hou Zhong Hui , Zhao Dong Liang
Published: August 2012

The poor electrochemical cycle stability of Re-Mg-Ni system A2B7-type electrode alloys has limited their practical application as the negative electrode materials of Ni-MH battery. In order to improve the electrochemical cycle stability of the La-Mg-Ni system A2B7-type electrode alloys, the partial substitution of Zr for La has been performed. The La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1 (x = 0–0.2) electrode alloys were fabricated by casting and melt-spinning. The microstructures and the electrochemical cycle stability and kinetics of the alloys were investigated. The structure characterized by XRD, SEM and HRTEM reveals that the as-cast and spun alloys have a multiphase structure, composing of two main phases (La, Mg)2Ni7 and LaNi5 as well as a residual phase LaNi2. The as-spun Zr-free alloy displays an entire nanocrystalline structure, but a like amorphous structure is detected in the as-spun alloy substituted by Zr, suggesting that the substitution of Zr for La facilitates the formation of an amorphous structure. The electrochemical measurement indicates that both the substitution of Zr for La and the melt spinning remarkably ameliorate electrochemical cycle stability of the alloys. Furthermore, the high rate discharge ability (HRD), the electrochemical impedance spectrum (EIS) and the potential-step measurements all indicate that both of the melt spinning and the Zr substitution bring on a notable decline of the electrochemical kinetics of the alloys.
Dephosphorization Ability Estimation of FetO-Rich Demanganization Slag during Hot Metal Pre-Treatment
Authors: Zhu Cheng Yi , Liu Jun , Li Guang Qiang , Chen Zhao Ping
Published: August 2012

In order to find out the optimum thermodynamic conditions for hot metal dephosphorization and predict phosphorus content after demanganization pretreatment, thermodynamic equilibrium experiments between CaO-FetO-SiO2-MnO-P2O5 slag and silver/solid iron were carried out in an iron crucible at different temperature under pure argon atmosphere in an electric resistant furnace. The results indicate that phosphorus distribution ratios increase with an increase of basicity in the slag at the experiment temperature, and then they decrease with an increase of basicity at 1573K and 1623K. The phosphorus distribution ratios decrease with an increase of FetO content in the slag at 1573K, while they increase with an increase of FetO content in the slag and then decrease with an increase of FetO content in the slag at 1623K. The results indicate that the maximum phosphorus distribution ratio between slag and hot metal is 92.4 when basicity of the slag is 1.7 and FetO content in slag is 49.75 mass% at 1623K, and the correspondent phosphorus content in the carbon saturated iron is 0.019mass%. Dephosphorization is easier under low temperature. The equilibrium quotient of phosphorus obtained in the present work is formulated as a function of slag compositions and temperature using the multiple regression method which is used to predict phosphorus content equilibrium with the demanganization slag and optimum conditions needed for ideal phosphorus contents in demanganization pretreatment.
Preparation of Al/SiO2 Composite Coatings on the Surface of Aluminum Alloy through Atmospheric Plasma Spraying
Authors: Gao Pei Hu , Li Lei , Li Jian Ping , Yang Zhong , Guo Yong Chun
Published: August 2012

In this work, Al/SiO2composite coatings were deposited on the surface of aluminum alloy through atmospheric plasma spray. The effects of SiO2volume in Al/SiO2composite powders on the deposition behavior were investigated. It was found that the deposition of the Al/SiO2composite powder became more difficult through plasma spray with the increasing of SiO2contents. There were reactions between aluminium and silicon oxide during the deposition of Al/SiO2powders in the plasma flame. The reactions were helpful to interface cohesions between aluminium and silicon oxide. Al/SiO2(60:40, 80:20) composites were more suitable for deposition and well interface cohesion through atmospheric plasma spray.
The Diffusion Kinetics Equation of Microwave-Assisted Extraction
Authors: Liu Hai Li , Guo Ping Sheng
Published: August 2012

In order to make adequate use of microwave to enhance extraction efficiency, the diffusion kinetics equation of microwave-assisted extraction was established on the basis of the theory of the liquid lattice model. By simplifying the diffusion kinetics equation, three simple relational expressions were obtained, which contained three experimental parameters (the extraction time, the liquid/material ratio and the particle radius, respectively). The fitting results showed that the theory curves were consentaneous to experiment results and all the related coefficient in fitting results were above 0.97 , which indicated that the kinetics model established is adaptive and appropriate in some range. Through further analyzing the fitting curves, it was indicated that the relation curves had different characteristics that one characteristic was the extraction rate obviously changed and the other was the extraction rate changed very slowly, which could provide a definite guidance for selecting the experimental parameters such as extraction duration, liquid/material ratio and particle radius in the extraction process.
Molecular Dynamics Simulation of the Mechanical Properties of NR/TPI
Authors: Jiang Hao , Yue Hong , Zhao Jian Yong , Sha Qing E
Published: August 2012

This paper addresses the potential of molecular dynamics simulation for structure–property correlations in rubber. This is an important topic within a multi-scale framework to rubber blends. For that purpose, the Mechanical Properties of NR(Natural rubber)/TPI(Gutta percha) are studied by Molecular dynamics simulation method. The result indicates that the NR/TPI’s properties have been improved significantly. Compared to the pure TPI, the rubber blends’ Modulus and rigidity decrease while flexibility and strength are enhanced. Based on these, the pair correlation functions are discussed, the best simulation technique identified in this study reveal the nature of interactions between the components of the blends.
The Chemical Kinetic Numerical Computation and Kinetic Model Parameters Estimating of Parallel Reactions with Different Reaction Orders
Authors: Zhong Wei , Tian Zhou
Published: August 2012

Abstract. Parallel reaction is a common reaction of chemical kinetics, and there are two types of parallel reactions according to the reaction orders equivalence: parallel reactions with same reaction orders and parallel reactions with different reaction orders. For the reason that the reaction orders are different, the chemical kinetic numerical computation and kinetic model parameters estimating of parallel reactions with different reaction orders is more complicated than parallel reactions with same reaction orders. In this paper, the 4th order Runge-Kutta method was employed to solve the numerical computation problems of complex ordinary differential equations, which was the chemical kinetic governing equations of parallel reactions with different reaction orders, and also, the Richardson extrapolation and Least Square Estimate were employed to estimate the kinetic model parameters of parallel reactions with different reaction orders. A C++ program has been processed to solve the problem and has been tested by an example of parallel reactions with different reaction orders.
Multiscale Computational Model of Nitride Semiconductor Nanostructures
Authors: Abgaryan Karine , Mutigullin Ilya , Bazhanov Dmitriy
Published: August 2012

Theoretical multiscale model of nitride semiconductor nanostructure is proposed. The model combines various computational methods such as density functional theory, molecular dynamics and kinetic Monte Carlo. As a first step of implementation of proposed approach ab initio calculations of structural and electronic properties of two different structures InN/Si and AlN/AlGaN/GaN heterostructures were carried out. In particular, the influence of oxygen on InN/Si adhesion energy was studied. AlN, GaN, AlxGa1-xN (x=0.33) spontaneous and piezoelectric polarizations as well as sheet carrier concentrations at GaN/AlGaN interface were calculated. Obtained value for sheet carrier concentration at GaN/AlGaN interface is close to experimental data.
Second-Order Kinetic Model for the Sorption of Cu(II) Ions in Aqueous Solutions of Zeolite NaA
Authors: Georgiev Dimitar Petrov , Bogdanov Bogdan Iliev , Hristov Yancho , Markovska Irena
Published: August 2012

In this study, the sorption of Cu(II) ions in aqueous solutions of Zeolite NaA by performing batch kinetic sorption experiments. The equilibrium kinetic data were analyzed using the pseudo-second-order kinetic model. A comparison was made of the linear least-squares method and nonlinear method of the widely used pseudo-second-order kinetic model for the sorption of Cu(II) ions of Zeolite . Four pseudo-second-order kinetic linear equations are discussed. Kinetic parameters obtained from the four kinetic linear equations using the linear method differed but they were the same when using the non-linear method. Kinetic parameters obtained from four kinetic linear equations using the linear method differed. Equation type 1 pseudo-second-order kinetic model very well represented the kinetic of the adsorption Cu(II) ions by Zeolite NaA. Equation type 4 exhibited the worst fit. Present investigation showed that the non-linear method may be a better way to determine the kinetic parameters.
Numerical Simulation of Natural Convection in a Two-Dimensional Enclosure Filled with Nanofluids
Authors: Zhao Su Fen , Li Xin Fang
Published: August 2012

The natural convection of nanofluids in a two-dimensional enclosure is numerically simulated with Fluent software. The effect of copper particle concentration and Grashof number on heat transfer properties is investigated. The results indicate that the suspended copper nanoparticles substantially increase the heat transfer rate at any given Grashof number, and the heat transfer rate of the nanofluid increases remarkably with the mass fraction of nanoparticles. For a given initial Grashof number, as the mass fraction increases, the velocity components of nanofluid increase as a result of an increase in the energy transport through the fluid. In addition, the intensity of the streamline increase with the increases of the Grashof number, which indicate the heat transfer properties are enhanced. The heat transfer process is dominant with the heat exchange at low Gr, while the heat transfer process is dominant with the natural convection at high Gr.
The Permeation and Swelling Behaviors between DMC, DEC, PC, EC and P(VDF-co-HFP)
Authors: Ma Xiang Yu , Duan Yan , Cui Jin Gang
Published: August 2012

Recently, poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) has drawn the attention of many researchers as an excellent material for polymer electrolytes. In this paper, the homogeneous P(VDF-co-HFP) films were prepared by volatilizing solvent method. The swelling behaviors of P(VDF-co-HFP) films in four kinds of carbonate esters (dimethyl carbonate, diethyl carbonate, propylene carbonate, and ethylene carbonate) and the permeation behaviors of the four carbonate esters in P(VDF-co-HFP) films were investigated at 10, 20, 30, 40 and 50°C under atmospheric pressure. It was found that the liquid content and degree of elongation of P(VDF-co-HFP) films in the carbonate esters increased with the increasing temperature, following the order of DMC > PC > DEC > EC. The order of permeation flux of the carbonate esters in the P(VDF-co-HFP) films was DMC > DEC > PC = EC = 0. The swelling behaviors of P(VDF-co-HFP) films were explained by Hansen Solubility Parameter (HSP) theory.