Advanced Materials Research Vols. 671-674

Abstract: This study dealt with the indoor thermal environment of an university library in Nanning where is hot in summer and warm in winter. Measurements of air temperatures, relative humidity and air velocity etc. at selected points inside the library were conducted during a summer period. Analysis results of measurement data was described in the paper. Thermal comfort was analyzed based on questionnaire survery. This paper also provides suggestions for improving the indoor thermal environment and comfort as well as energy performance in library-like buildings in the hot-summer and warm-winter region.

Abstract: Base on the case of many water source water be polluted at present, the water eutrophication more and more serious tendency, many water sources was polluted seriously. We need to find a method of highly effective, the low-priced to processing water source water .Process the water source water by the zeolite especially the modified zeolite is the particular one method. In order to find out the best method of decontamination ammonia nitrogen from the tiny polluted water, adoption different temperature to heat; different density of HCl, different density of NaOH to modify zeolite. The result is that the best method is soaking in 0.1mol/L HCl 12h; the best quantity is adding 250mg modified zeolite to 250mL sample water.

Abstract: Nitrogen-fixing bacteria were screened from the rhizosphere soil of plants in Shaanxi in China. 36 free-living nitrogen-fixing bacterial strains were isolated and their nitrogenase activity were determined by acetylene reduction assay (ARA), two strains named FLNB03 and FLNB09 with higher nitrogenase activity were isolated and identified by 16S rRNA sequencing. The datum showed that FLNB03 was similar to Acinetobacter and their similarity reached 99%, FLNB09 was similar to Agrobacterium sp. and their similarity reached 99%. Then both of them were treated using Dielectric Barrier Discharge (DBD) plasma for mutation and their mutants called FLNB03-2 and FLNB09-3 were obtained. The nitrogenase activity of FLNB03-2 was 0.61±0.10 nmol•107cfu-1•h-1, and that of FLNB09-3 was 0.40±0.05 nmol•107cfu-1•h-1, their nitrogenase activity increased by 22.00% and 14.29% than their original bacteria respectively. FLNB03-2 and FLNB09-3 might be used as microbial fertilizer.

Abstract: The aim of our research was to find the better treatment progress for landfill leachate. It elaborated the source and the quality variation law with time change and harm to human body of the leachate. Listed all kinds of treatment methods, including physical, chemical, biological. Thought the development trends of landfill leachate treatment was the combination of multiple progress.

Abstract: Land subsidence and ecological problems caused by underground mining threaten seriously the sustainable development of mining areas. An example of coal mining areas in the northwest of Henan province is studied. The subsided areas amount to 70 km2 and the maximum subsided depth is more than ten meters. A series of serious problems, such as soil erosion, soil fertility declining and vegetation degeneration, are caused by land subsidence. Engineering measures are adopted for the subsided lands in hilly areas to rebuild the land as types of terrace and gentle slope, and that in the plain to renovate with methods, such as drainage, filling with coal waste rocks or fly ashes, deepening lower subsidence and filling higher subsidence. At the same time, biological measures, such as planting peanuts, soybean and other legume perennial or annual herbs, and adding organic fertilizer are used to improve the reclaimed soil quality.

Abstract: The large amount of waste lye was generated during hydrothermal synthetic zeolite from coal fly ash by microwave-assisted heating. The environment will be polluted, if the improper handing of waste lye, and discharged into the surface water. The washing process of the synthetic zeolite was studied in this paper. Rational recycling of waste lye and reduce the amount of it emissions in the washing process were found. By comparing the environmental effects and the technical and economic, the method of washing with water-acid-water was determined to be the best solution of the zeolite washed. The waste lye can be recovered in this method, and it will be used for preparation of lye in the next synthetic zeolite. Cost was saved, and emissions of waste lye was reduced, too.

Abstract: The 1,3-benzenediol and ethyl acetoacetate as raw materials were used to synthesize 7-hydroxy-4-methyl coumarin under microwave irradiation with Zirconium sulfate tetrahydrate as the catalyst. The effect of various reaction conditionson on the yield was explored.Experiment shows that the yield reached up to 87. 5%,when the reaction conditions are as follow:n(1,3-benzenediol):n(ethyl acetoacetate)1.0, Zirconium sulfate tetrahydrate 0.4g,10mL cyclohexane, the reaction time 12 min,microwave radiation power 500W.

Abstract: Because of global warming, research on carbon sink is increasingly gaining international attention, there are 1.3 GtC/year unknown sink in the continental biosphere. In this study, we will present the high-resolution data of the DIC(DIC=H2CO3+HCO3−+CO32−), pH, and Pco2(carbon dioxide partial pressure) measured during the storm scale of Maocun subterranean river in Guilin on June 13-17,2010, which shows a high response to the rainfall. Though monitoring the rainfall, water level, water temperature, PH, Ec(electrical conductivity) and calculating of SIc (saturation index) and Pco2, to analyze the dynamic behaviors of DIC and discharge in storm scale. Studies suggest that DIC, pH, SIc and PCO2 are highly sensitive to rainfall, Discharge obviously increases after precipitation and changes with the rainfall intensity. According to the comparision of carbon sink between March 7, 2010 and June 13, 2010 of Maocun subterranean river, the data presents that carbon sink is obviously increased. Furthermore, carbon sink changes with different seasons, the result shows that rainy season 's carbon sink is larger than dry season, the research presents that pecipitation is an important factor in influencing the karst carbon sink potential.

Abstract: The square is a public's activity center; it is the indispensable part of life, better to give citizens a sense of belonging. But our side of square have some inadequacy, how to improve it This article through to the space environment survey statistics on People's square Xiangan, to lead to these enlightenment, square design need to have advanced the idea, not only meet the current demand but also consider the long-term changes.

Abstract: Based on a situ experiment in the Yangtze River Region, the CO2 emission flux of the natural wetland and the different reclamation types of soil during the non-growth season were investigated in this paper. The results showed that the contribution of soil respiration (SR) to the atmospheric CO2 concentration is wetland＜dry land＜paddy field..Furthermore, there was a significant positive correlation between the soil respiration and air temperature and soil temperature in three soil type . It concluded that reclamation of fresh water wetland significantly increased SR and soil CO2 emission from soil which was affected greatly by environmental temperature and reduced soil sequestration.