检索结果-南通市图书馆

Journal of environmental sciences 1994年第4期6卷 478-485,485页

作者： Hu Dan (research Center for eco-environmental sciences ,{4. ,{5.)

Based on fundamental principles of ecology ,the ecological philosophy connotation of Feng-Shui(Wind and Water) concept from experiences of chinese agricultural culture was first discussed , and then hu-man-ecological implications of Feng-Shui environment architecture is analyzed. As a theoretical integrationbetween human ecology and Feng-Shui theory ,“environment” and “{5. design” concepts were re-examined and given new definitions. With holistic principles of human ecological design in the context ofFeng-Shui , essential technical ways of integrative human ecological design were explored in the presentationof a case study of an urban {5. design in east china.

关键词： integrative environmental design human ecology Feng-Shui environment architecture.

Hydrolytic　dynamics　of　pesticide　N＇－（2，4.dimethylphenyl）－N－methylformamidine　in　aquatic　solution

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1996年第2期8卷 185-190页

作者： Mo Hanhong Yang Kewu An Fengchun Liu Ye (research Center for eco-environmental sciences,{4.,{5.) Res. Ctr. for eco-Environ. sciences Chinese Academy of Sciences Beijing 100085 China

The hydrolytic dynamics of pesticide N' -(2,4.dimethylphenyl)-N-methylformamidine (DMA) in aquatic solution and its degradation in simulated aquatic ecosystem were investigated. The results showed that the compound was not very stable in aqueous solution and easily decomposed in alkaline solution. It was stable below pH5.and there was obvious tendency that the compound was easily decomposed when PH was greater than 6. The reaction rate constant of DMA increased with increasing of either pH value Or temperature of reaction medium. The half-life values of hydrolysis for DMA at 25. were 15. 92 days at pH 6, and 1. 4. days at pH 9 , respectively. The temperature coefficient and activation energy of hydrolysis for DMA was 2. 9 and 78. 74.J. mol-1 , respectively. The degradation of DMA in simulated aquatic ecosystem was similar to that in buffer solution in the laboratory. The half-life values of degradation for DMA at 26℃ in simulated aquatic ecosystem were 3. 23 days at pH 9. 13 and 1. 4. days at pH 8. 28 , respectively.

关键词： pesticide N'- ( 2,4.dimethylphenyl)-N-methylformamidine hydrolysis degradation.

Biologically effective radiation of solar ultraviolet radiation and the depletion of stratospheric ozone

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1994年第3期6卷 373-381页

作者： Wang Shaobin Su Weihan(research Center for eco-environmental sciences,{4. {5. of sciences),beijing 100085.china) Wei Dingwen(Institute of Atmospheric Physics,{4. {5. or sciences),beijing 100029,china)

Based on the biological action spectra and total UV-B radiation in the atmosphere,the effective UV-dose for DNA, erythema,and plant at different seasons in the last decade,and their future change in beijing area were *** results indicate that the maxi- mum of biologically effective radiation dose at noontime is in July and the minimum is in January. From 1980 to 1989 biologically effective radiation dose have increased with the average rates of about 0.6,0.7 and 1.1 mW/m￣2 per year for January, April and October,while in July the trend of radiation dose is not ln evidence. For 1% reduction of ozone concentration radiation amplification factor for DNA,erythema and plant are 2.3,2.3 and 1.4.and for 30% reduction of ozone concentration the RAF for DNA,erythema and plant are 4.2,4.0 and 2.1,respectively.

关键词： UV-B ozone depletion biological effects solar radiation.

A numerical simulation of kinetic constraint on evaporation of ammonium nitrate in diffusion denuder

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1998年第1期10卷 115-123页

作者： Shen Ji research Center for eco environmental sciences,{4.,{5.

A numerical simulation model has been developed to investigate the diffusion and reaction in diffusion denuder for reactive gases and aerosols. The analytical equation for equilibrium and kinetic equations of NH 4.O 3, NH 3 and HNO 3 system were presented. The model results of sampling efficiencies were agree with those calculated by Gormley Kennedy equation and other models. The evaporation of NH 4.O 3 aerosol has a kinetic constraint. The kinetic constant can be estimated from evaporation data. The model results showed that an annular denuder can separate reactive gases and aerosols.

关键词： kinetic constraint ammonium nitrate diffusion denuder.

Heavy metal adsorption on the Le An River sediment —The adsorption model

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1997年第1期9卷 59-70页

作者： Wen Xianghua Du Oing Tang Hongxiao research Centre for eco-environmental sciences,{4. {5. of sciences.beijing 100085.china Res. Ctr. for eco-Environ. sciences Chinese Academy of Sciences Beijing 100085 China

In this study,the surface properties and adsorption properties of the Le An River sedi- ment were modelled via surface complexation *** model parameters were determined based on the data of our potentiometric titration experiments and the metal adsorption experiments with the Le An River sediment ***,the surface complexation models for the natural sediment,in our case the Le An River sediments,which can interpret the experimental data very well were successfully *** typical surface complexation models that is the con- stant capacitance model,the diffuse layer model and the triple layer model,were considered in this *** work indicated that the consistency and the interdependency among model parame- ters together with the selection of the surface adsorbed species should be emphasized.

关键词： surface complexation model Le An River sediment potentiometric titration adsorption.

Levels and distributions of polychlorinated biphenyls in sewage sludge of urban wastewater treatment plants

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 2009年第4期21卷 468-473页

作者： GUO Li, ZHANG Bing, XIAO Ke, ZHANG Qinghua, ZHENG Minghui State Key Laboratory of environmental Chemistry and ecotoxicology, research Center for eco-environmental {5., chinese academy of sciences,beijing 100085. china [a]State Key Laboratory of environmental Chemistry and ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Concentrations of polychlorinated biphenyls （PCBs） have been measured in sewage sludge samples from 8 urban wastewater treatment plants in beijing, china. The PCB congeners were analyzed by isotope dilution high resolution gas chromatography/high resolution mass spectrometry method. The concentration of PCBs ranged from 65.6 to 15. ng/g dry weight （dw）, with a mean value of 101 ng/g dw. The dioxin-like PCB WHO-TEQs （World Health Organization-Toxic Equivalents） of the sludge were lower than 1 pg /g dw. Consequently, all the concentrations of PCBs in sludge samples were below the upper limit for land application according to the chinese legislation law for agriculture use. The PCB homologue profiles in sludge samples were dominated by tri-CBs and tetra- CBs. Similar distributions have been found in one of the chinese PCB commercial products. The patterns of dioxin-like and indicator congeners observed in this study were quite similar in all samples. The predominant congener for dioxin-like and indicator PCBs were PCB-118 and PCB-28, respectively, while PCB-126 had the highest TEQ value.

关键词： polychlorinated biphenyls wastewater treatment plant sewage sludge distribution

Evaluation on abundance or deficiency of avai－lable trace elements in soil of middle area in china and the effect of applying trace element fertilizer

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1994年第3期6卷 361-372页

作者： Li Jiyun Liu Xiudi Fan Lihong Tong Yiping Yang Junhui(research Center for eco-environmental sciences,{4. {5. of sciences,beijing 100085.china)

The authors selected the west part of Xinxiang City,Henan Province in the north china plain as a typical region and carried out assessments of the abundanca or deficiency of the trace ele- ments(B,Mn,Mo,Zn,Cu,Fe)in *** can be seen from results that more than 80% of the farmland is deficiency of zinc(4.% of molybdenum(0.15.pm),38% of boron(0.5.pm),29% of manganese(100ppm)and 13% of iron(7.0ppm)and that the content of available trace ele- ments in soil are related to the topography *** the proper application of trace elements on grain crops is presented.

关键词： evaluation available trace element soil type topography.

On the determination of nitrous oxide emission factor during biomass burning

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1994年第3期6卷 261-267页

作者： Cao Meiqiu Zhuang Yahui (research Center for eco-environmental sciences,{4.) P. O. Box 2871,{5. 100085.china

The emission factors of nitrous oxide have been determined during the combustion of rice straws, maize stalks and wheat stalks in an enclosed combustion system. They equal to 84.4.± 6.08g/t for rice straws,132± 8.63g/t for maize stalks,and 27.3 ±1.79g/tfor wheat stalks,respectively. The uncertainties in the determination of nitrous oxide have been discussed. The N_2O-N(nitrogen in nitrous oxide emission)accounts for 0. 5.% and 0. 87% of the total nitrogen in rice straws and maize stalks,respectively. An 1￣0 ×1￣0 grid map on the distribution of N_2O emission from biomass burning in china mainland was shown.

关键词： biomass burning,nitrous oxide emission factor

Synthesis of a magnetic micro/nano Fe_xO_y-CeO_2 composite and its application for degradation of hexachlorobenzene

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2010年第6期53卷 1266-1272页

作者： JIA ManKe,SU GuiJin,ZHENG MingHui,ZHANG Bing & LIN ShiJing State Key Laboratory of environmental Chemistry and ecotoxicology research Center for eco-environmental {5.,chinese academy of {5.,beijing 100085.china 1. State Key Laboratory of environmental Chemistry and ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

A micrometer-sized nanostructured,magnetic,ball-like FexOy-CeO2 composite was synthesized through an ethylene-glycol mediated *** synthesized samples were characterized by scanning electron microscopy combined with energydisperse X-ray analysis,transmission electron microscopy and X-ray powder *** the synthesis system,polyethylene glycol (PEG) and urea were found to play significant roles in the formation of the micrometer-sized spherical architecture of the *** details of morphology and particle size could be changed with the initial concentration of Fe(NO3)3-9H2O and Ce(NO3)3-6H2O as the *** magnetic FexOy-CeO2 composite with a similar morphology was readily obtained by calcination from the *** characterization of transmission electron microscopy showed the calcined ball-like architecture was a highly porous structure consisting of many *** of the micrometer-sized nanostructure and the multi-components as well as the magnetism,the as-obtained FexOy-CeO2 composite showed better activity and potentially easy recovery for the harmless degradation of hexachlorobenzene (HCB).

关键词： FexOy-CeO2 composite 3D micro/nanostructures degradation of hexachlorobenzene

Construction of WCB-11:A novel phiYFP arsenic-resistant whole-cell biosensor

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 2010年第9期22卷 1469-1474页

作者： Qing Hu ,Li Li,Yanjuan Wang,Wenjuan Zhao,Hongyan Qi,Guoqiang Zhuang Department of environmental Bio-Technology,research Center for eco-environmental {4.,{5. academy of {4.,beijing 100085.china. [a] Department of environmental Bio-Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

The prediction and assessment of environmental pollution by arsenic are important preconditions of advocating environmental protection and human health risk assessment. A yellow fluorescent protein-based whole-cell biosensor for the detection of arsenite and arsenate was constructed and tested. An arsenic-resistant promoter and the regulatory gene arsR were obtained by PCR from the genome ofEscherichia coli DH5.t, andphiYFP was introduced into E. coli DH5.t as a reporter gene to construct an arsenic-resistant whole-cell biosensor （WCB-11） in which phiYFP was expressed well for the first time. Experimental results demonstrated that the biosensor has a good response to arsenic and the expression ofphiYFP. When strain WCB-11 was exposed to As^3＋ and As^5., the expression of yellow fluorescence was time-dependent and dose-dependent. This engineered construct is expected to become established as an inexpensive and convenient method for the detection of arsenic in the field.

关键词： arsenic reporter gene whole-cell biosensor yellow fluorescent protein (phiYFP)