Applied Mechanics and Materials Vols. 99-100

Abstract: Urban open space which maintaining the diversity of the urban ecosystem, is an important structural element of the city. Urban development led to the isolation of open space between one another, and the ecological function and environmental function of open space greatly reduced. This article pointing out that we should protect and restore urban ecological structure, improve the open space network, strengthen the links between open space, take low impact development approach to reduce the impact of urban development on the natural environment and restore the ecological functions of open space.

Abstract: This article argues the problems of ecological strategies in the planning of pedestrian street system, and the main contents of ecological strategies under the concept of low-carbon strategy. From a whole environmental ecosystem to an urban pedestrian ecosystem, some strategies of pedestrian zone are studied. The paper also discusses the contents of ecological strategies in the ecological design of pedestrian street system, the major controllable factor in the ecological strategies, the pedestrian street ecosystem and the urban spaces, the urban life etc. In addition to these, the article studies the composition of pedestrian street ecosystem, the relationship among the urban ecosystem and the pedestrian ecosystem, the planning and design integrated ecology, the method of interdisciplinary working. System theory is involved in this paper to discuss relevant questions.

Abstract: The public in China have a vague notion of architecture energy conservation, additionally the various and complex geographical position and climate, so the problem of architectural energy dissipation has deteriorated. In terms of architectural energy conservation, this design wholly considered energy conservation and emission reduction in the whole life cycle. The theory of “nonexistence-existence-nonexistence” should be carried out practically and low-carbon, ecological kindergarten will be founded in Huainan by studying and taking advantage all kinds of reasonable energy conservation technology. We should exert a subtle influence on cultivating children’s sense of energy conservation and emission reduction in order to make it be popular in the society which treats children as center.

Abstract: According to Xuanmei Yang and other scholars’ study, space heating and cooling together with water heating consist the majority of domestic energy consumption. This article analyzes the seven aspects of domestic energy consumption by heating or cooling. From the building envelope technology and low-carbon technology aspects, it provides numbers of feasible strategies to attain low-carbon residential design adapting to the energy consuming sources of the residential construction.

Abstract: This paper presents a novel design for dual buck half bridge five-level inverter (DBHBFLI), which based on field-programmable gate array (FPGA), and was used for photovoltaic power system. This topology is derived from dual buck half bridge inverter (DBHBI), which has the characteristics of no shoot-through problem, no body diode reverse-recovery problem, and current half-period work mode, these merits are retained in the proposed inverter. FPGA logic device is chosen for the hardware implementation of control circuit. The FPGA controller consists of six main modules: the sine wave generator module, the triangle wave generator module, the voltage proportion integration (PI) module, the current proportion (P) module, sinusoidal pulse width modulation (SPWM) module, and SPWM distribution module. VHDL is used in the design of each module. The simulation and experiment results which confirm the validity and performance of the design are shown in the paper.

Abstract: With the rapid development of new wall material in recent ten years, it is difficult to select the reasonable product. In order to guide the healthy and orderly development of energy saving wall material, all kinds of wall material are analyzed comprehensively basing on the various possible indexes which affect the performance of wall material. By evaluating, the leading product of energy saving wall material is obtained.

Abstract: In the rapid urbanization of rural western China, a variety of long-standing housing typologies are being replaced with energy consuming brick-concrete structures that have little connection to vernacular traditions. To improve this situation, this paper proposes an ecologically sensitive alternative, based on a case study of the design and construction of 44 new dwellings in Daping Village, Sichuan Province, after that area was devastated by the May 12, 2008 earthquake. We propose that this eco-approach may represent a generalizable approach for sustainable development of vernacular architecture in western China.

Abstract: In order to quantify energy saving effect of existing building envelope reconstruction, the paper makes the envelope reconstruction project of Jinan Lixia Office Building as a case, uses energy consumption simulation software DeST-C to make dynamic simulation analysis on several aspects such as natural room temperature, cold and hot load before and after reconstruction of experimental building in cold area. After reconstruction, accumulative hot load of building obtained by calculation decreases 33%, accumulative cold load decreases 15.67%, total load decreases 21.04% in the whole year, and the results show energy saving reconstruction effect of existing building envelope is remarkable.

Abstract: environmental pollution and resource scarcity have become urgent problems for the whole society to solve. Therefore, in the construction industry, to realize the ecological building of sustainable development has increasingly become the focus of attention. To apply ecological research theory into building design system, to build sound ecological architecture system, to realize the harmonious coexistence of human living space and natural environment are important development goals for future ecological architecture.

Abstract: The reutilization of waste concrete and fly ash produced by power plant is one way to develop green concrete. The addition of fly ash in recycled aggregate concrete has two methods, named equivalent replace and super-substitute technique. The workability of fresh concrete, compression strength, spilt and flexural strength of recycled aggregate concrete with different content of fly ash at different curing age are tested. Durability performance index such as sulfate attack, drying shrinkage and wear resistance is acquired base on the corresponding test. The result shows that the fluidity of fresh concrete is improved by the addition of fly ash. Before the age of 28d, the compression and flexural strength of recycled aggregate concrete with the contain of fly ash is lower than concrete without fly ash, after the age of 60d, the compression and flexural strength for FRC-10, FRC-10-2, FRC-10-4 are even higher than that of concrete without fly ash. The optimum equivalent replace ratio is 10%, and super-substitute ratio is 20% according to the compression and flexural strength. The performance of sulfate attack resistance, drying shrinking and wearing resistance of recycled aggregate concrete are significant improved as the containing of fly ash.