Frontiers of Green Building, Materials and Civil Engineering

Volumes 71-78

doi: 10.4028/

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Authors: Ai Hua Gao, Shui Jiao Yang, Shang Bin Hu, Xiao Qing He, Zhi Guo Lu
Abstract: The treatment of industrial wastewaters collected from petrochemical works, gypsum plant, and printing and dyeing mill, was investigated at atmospheric pressure in air discharge plasma. The degradation effects of organic contaminants in water were compared for the printing and dyeing wastewater under different discharging conditions and for the wastewater from the other two plants under the same discharging conditions. The influences of several factors on chemical oxygen demand (COD) remove rate were studied experimentally. The results showed that the treatment effects for the same industrial wastewater differed significant under different discharge conditions. There may be a suitable discharge plasma treatment to specific industrial wastewater. Due to the removal rates of COD of industrial wastewaters with discharge plasma isn’t very high, therefore the discharge plasma water treating needs to combine conventional water treating methods or addition other catalyst to effectively remove organic pollutants in wastewater and obtain the expected treatment effect.
Authors: Xin Dong Wei, Xue Feng Yun, You Ke Wang
Abstract: Based on the monitoring and analysis of field experiments, used the advanced auto-monitoring instruments, we studied the effect of air temperature and humidity near the ground under moisture conserving irrigation(MCI) of Straw Mulch in maize field. The result showed that the air temperature and humidity near the ground could be decreased and increased separately. The relationship between the air temperature and humidity near the ground can be expressed by Index equation. The view of this study is to provide a theoretical basis for promoting the technology of MCI of straw mulch.
Authors: Cai Zhi Zhao, Hua Qiang Zhou
Abstract: Aiming at the factors affecting the strength of coal paste filling material, the relation between affecting factors and strength of coal paste filling material was revealed on the basis of a lot of experiments in the lab, in which the river sand was used as skeletal material. The tests show that the strength is mainly affected by the slurry density, dosage of fly ash and cementation. However, the establishment of mathematical model between the strength and all affecting factors is very difficult. In order to more accurately forecast the strength of coal paste filling material, the model was established by applying BP networks. The results show that the model is feasible and scientifically justified to forecast the strength of coal paste filling material. The conclusions can provide some references for the practice of none-village-relocation coal extraction in the mine. Introduction
Authors: Yun Long Ma, Jian Wang
Abstract: Among researches on crowd flow evacuation under emergency, there are no deep touch of coordinating evacuation strategy of crowd and traffic, and also can not set models and simulate the whole picture of evacuation. The purpose of this research is to realize the coordinating evacuation of both traffic and crowd. The author divided the situations into Not Intervene and May Intervene, analyzed the coordination system and probed the model of coordinating evacuation. A series of coordinate evacuation method has been put forward based on swarm intelligence and simulation optimization. Based on the result of crowd simulation and Ant colony algorithm, in order to find the optimal traffic evacuation proposal, the author took use of the improved Genetic Algorithm as well as the distributed coordinating simulation, finally found a systematic optimal scheduling program. Also the internal regular pattern of coordinating evacuation has also been revealed. All these will provide support for emergency planning and decision making.
Authors: Qian Zhao, Huan Zhen Zhang, Fei Li
Abstract: With the world economic development, environmental pollution caused by contaminated sites has become a focused problem in the world. The backward remediation and management of contaminated sites in China make this problem more prominent. Based on the generalized understanding of "contaminated sites", the paper analyzed contaminated sites information and summarized types, characteristics and distribution of typical areas in China according to category.
Authors: Qian Zhao, Hong Bo Li, Quan Wei Wei, Huan Zhen Zhang
Abstract: As typical shallow lake of the north China plain, Baiyangdian plays an important role on water system composition and water amount adjustment. Its water storage and average annual rainfall of the basin does not exist directly relation and its maintenance of function water amount can only rely on unconventional water supplies and diversion support. The lack of natural entering water and frequent artificially diversion makes Baiyangdian gradually become "artificial lakes". In order to solve the current problems of Baiyangdian, the control of development indexes for Baiyangdian basin water resources urgently needs to be intensified, and water diversion mechanism of basin water amount based on Water subsidise cycle should be established.
Authors: Shi Sheng Jia, Mao Ying Zhou
Abstract: The sound gathering and broadcasting system in which the TMS320VC5416 is as the control center, the TLV320AIC23 as the codec and G.711 as coding standard is presented in this paper. The composition of the system, the design of the hardware circuit and the programming method of the software are proposed. The configuration mode of the Multichannel Buffered Serial Port (McBSP0 and McBSP1) of TMS320VC5416 and that of the control interface and the digital audio interface of the codec chip TLV320AIC23 are determined. The system realizes the storage and transmission of the digit audio signals well and obtains a high grade effect in time, with DSP chip processing the digit audio signals by means of the G.711 code standard.
Authors: Yu Qin Shao, Zi Long Zhao, Hui Zhou, Hui Min, Li Xin Wang, Ji Zhao
Abstract: In this study, the composition of dominant microorganisms, such as fungi and actinomycetes, in river wetland soil on typical steppe were measured through Spread-Plate-Technique; the divergent characteristics of these two floras at river wetland and typical steppe were analyzed; and several indicators of soil filamentous microorganisms, for example, diversity, richness, evenness, and dominance, were calculated. The results demonstrated that there is obvious divergence characteristics of terrestrial distribution for predominant flora, i.e. soil filamentous microorganisms, at river wetland on typical steppe. For fungi, there is significant difference between river center (HX), riverside (HB), low floodplain (DQ) & high floodplain (EQ), and typical steppe (DT) for diversity and richness; and there is significant difference between HX and DQ & EQ for evenness. For actinomycetes, there is significant difference between HX & HB, and EQ & DT for diversity and evenness; and there is significant difference between HX, HB, DQ & EQ, and DT for richness. There are certain differences between predominant floras at river wetland and typical steppe. At HX, the most dominant flora is Mucor to account for 100%. At DQ, the dominant floras are Mucor, accounting for 50%, and Cephalosporium, accounting for 50%. At EQ, Mucor accounts for 62.2% and Cephalosporium accounts for 21.1%. At DT, Penicillium has become the dominant flora to account for 69.2%. For actinomycetes, balding group accounts for 100% at HB and 66.7%. At DQ, two dominant floras are balding group and Griseofuscus to account for 38.5% and 41.3%, correspondingly. At DT, the dominant flora is Griseofuscus to account for 61.7%. For filamentous microorganisms at river wetland, two indicators, numbers and diversity, have shown the divergent characteristics that it evolves from humidogene to humidogene﹢terrestrial, then to terrestrial, where soil environment at DQ, EQ and DT are more suitable for the growth of filamentous microorganisms, and the decomposing processes from filamentous microorganisms have facilitated the development and succession process of river wetland. The results have demonstrated a better understanding toward the development and succession mechanisms of river wetland to provide the basis for protection and rational utilizations of river wetland.
Authors: Ji Qing Tan, Hui Qi Li, Zhao Xia Zheng
Abstract: A new conception, called the Most Direct Impact Area (MDIA) of typhoons, is put forward in this paper. After the computational method is explained in detail, the databank of 1955 typhoons of China Meteorological Administration (CMA) have been calculated on the Linux operational platform with a Fortran compiler in a computer. The results via calculating the geographic distribution of the MDIA of typhoons show that the characteristic of typhoon activity in a year can be easily identified in quantity. A most interesting feature has been found that typhoon activity is abnormally active over the ocean to the south of Japan in three typical El Niño years.
Authors: Wen Li Wang, Jie He, Mang Mang Zhang
Abstract: This investigation firstly performs a thermal elasto-plastic analysis using finite element techniques to evaluate residual stresses in monolithic joint weldments, then develops an effective procedure by combining the welding residual stress and dynamic responses by moving train loads , finally calculates the stress history of hot spots in local weldments .The results showed that the stresses of some hot spots in weldments had exceeded the yield stress of steel , so the fatigue of these spots should be categorized into low cycle fatigue; the load application on the welded bridge produces a reassessment of the stress field in the weldments and, in particular, a relaxation of the maximum stress.

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