检索结果-内蒙古大学图书馆

Ecological thresholds of Suaeda salsa to the environmental gradients of water table depth and soil salinity

Acta Ecologica Sinica 2008年第4期28卷 1408-1418页

作者： Baoshan, Cui Qiang, He Xinsheng, Zhao State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

The responses of Suaeda salsa to the environmental gradients of water table depth and soil salinity in the Yellow River Delta, China were analyzed from the aspect of ecological thresholds which were developed from the Gaussian model. Based on the correlation analysis of population biomass, density, height, coverage and abundance of Suaeda salsa, population biomass was selected as the population index for further analysis. The results indicated that the optimum water table depth for the growth of Suaeda salsa was about -0.42 m, the ecological thresholds were from -0.92 m to 0.08 m, and the optimum ecological thresholds were from -0.67 m to -0.17 m. To the soil salinity gradient, the optimum was about 12.71 g/kg, the ecological thresholds were from 5.17 g/kg to 20.25 g/kg, and the optimum ecological thresholds were from 8.94 g/kg to 16.48 g/kg. However, the effect of water-salinity interaction seemed to be important to the growth of Suaeda salsa, which was discussed through analyzing the water table depth-soil salinity relationship and their interactions. By using Ward cluster analysis and Gamma distances, 69 sampling sites were classified into 7 kinds of Suaeda salsa communities. It was found that there was a remarkable response of the community structure of Suaeda salsa to the water table depth and soil salinity gradients, which can be a switchover from xeromorphic and saline-alkali plants to limnophytes, and vice versa. © 2008 Ecological Society of China.

关键词： ecological threshold Gaussian model Suaeda salsa wetland Yellow River Delta

来源：评论

学校读者我要写书评

暂无评论

Mineralogical characterizations and reaction path modeling of the pozzolanic reaction of fly ash-lime systems

Mineralogical characterizations and reaction path modeling o...

引用

作者： Lu, Peng Li, Qin Zhai, Jianping State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China Department of Geological Sciences Indiana University Bloomington IN 47405

Mineralogical studies show that fly ash-lime systems without NaOH produced Al-rich calcium silicate hydrates and a small amount of ettringite. The presence of NaOH accelerates the pozzolanic reaction of fly ash. Fly ash-lime systems with NaOH produced Al-rich calcium silicate hydrates, calcite, meixnerite, and NaX-type zeolite (or zeolite precursor) after 28 days of reaction time. Carbonation of alkali-activated fly ash-lime systems call for specific studies. The experimental work was supplemented with reaction path modeling, which provided a quantitative procedure to decipher the chemical nature of fly ash hydration and cementitious system formation. © 2008 The American Ceramic Society.

关键词： Fly ash

来源：评论

学校读者我要写书评

暂无评论

Application of the Export Coefficient Model in Estimating Nutrient pollution of Dahuofang Reservoir Drainage Basin, Daliao River, China

Application of the Export Coefficient Model in Estimating Nu...

引用

International Conference on Bioinformatics and Biomedical Engineering (ICBBE)

作者： Rui-min Liu Meng-chang He Xiu-juan Wang State Key Laboratory Of Environ. Simulation and Pollution Control School of Environment Beijing Normal University Beijing China

In this paper, using export coefficient model and RS and GIS techniques, the NPS pollution load of Drainage Basin of Dahuofang Reservoir in the year 2000 was estimated, and its spatial distribution was simulated. Results indicates that the total nitrogen load is 3.90X103 tons, and that of total phosphorus is 1.57X102 tons, in which cropland, Qingyuan County and Xinbin County are important contributories. Analysis on the intensity load of NPS pollution shows that Xinbin County is the highest NPS pollution load areas, and these areas should be paid more attention in the future.

关键词： Water pollution Reservoirs Rivers Geographic Information Systems Nitrogen Analytical models Remote sensing Water resources Data processing Predictive models

来源：评论

学校读者我要写书评

暂无评论

Modelling the Carrying Capacity of Urban Ecosystem

Modelling the Carrying Capacity of Urban Ecosystem

引用

The 2nd International Conference on Bioinformatics and Biomedical Engineering(iCBBE 2008)(第二届生物信息与生物医学工程国际会议)

作者： Linyu Xu Zhifeng Yang Wei Li State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing China

The urban ecosystem is a Social-Economic-Natural Complex consisting of human beings and their surrounding. Because resources and environmental quality are crucial to the existence and development of an urban ecosystem, the development of an urban ecosystem is necessarily built on the basis of interactions among environmental carrying capacity (ECC), resource carrying capacity (RCC) and social-economic development capacity (SEDC). A single component's capacity should not be studied without considering the integrity of the whole system. In this paper, the concept of 'Compound carrying capacity' (CCC) is introduced and studied as an index of the interactions among ECC, RCC and SEDC, as a basis for meeting the challenges of urban sustainable development and eco-city building. Using this index, it is discussed in both theory fundamentals and quantitative models how these three kinds of capacity function to sustain the urban ecosystem. The concept of CCC is introduced to improve the comprehensive understanding of this system's structure and functions. Compared with traditional concepts, the CCC of the urban ecosystem includes the ability to develop and thus is characterized by being more dynamic. This dynamism shows in the ability of cities to respond when put under pressure. Clearly, this dynamic is not endless, both environmental, resource and social-economic development capacities have limits. A comparative study of urban ecosystems and the human immune systems shows that both systems have similar features. Thus, the CCC model is discussed in this paper in light of the biology immunity theory. In this it is assumed that the urban ecosystem is the material input and its main function is to offer eco-services. The extent of these services is dependent on both the intrinsic carrying capacity and the acquired carrying capacity of the urban ecosystem. The methodology for both calculation and adjustment mechanism of the CCC is outlined, with reference to the urban ecosystem

关键词： Urban Ecosystem Carrying capacity Guangzhou

来源：评论

学校读者我要写书评

暂无评论

QSAR Study on the Non-Monotonic Dose-Response Curve of PCBs in Chicken Embryo Hepatocyte Bioassay

QSAR Study on the Non-Monotonic Dose-Response Curve of PCBs ...

引用

第五届全国环境化学大会会议

作者： Yunsong Mu Aiqian Zhang Changan Gao PENG SuFen WANG LianSheng State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing Univers State Key Laboratory of Pollution Control and Resource Reuse School of Environment NanjingUniversi

Endocrine disrupting chemicals（EDCs）in the natural environment exhibit aunique non-monotonic dose-response curve and it is impossible to select one simpleindex to characterize the biological activity of these ***-activity relationship（QSAR）study on non-monotonic dose-response curvehas become a real challenge *** order to explore the possible mechanism forthe non-monotonic dose-response curve of polychlorinated biphenyls congeners（PCBs）in chicken embryo hepatocyte bioassay,AM1 method of ChemOffice wasadopted to calculate necessary structure descriptors for PCBs,while the interactionsbetween PCBs and simulated AhR ligand binding domain（LBD）were analyzed byusing FlexX in *** binding modes for PCBs have been distinguishednot only from aligned conformation but also from free binding energy.

关键词：多氯联苯非单调剂量内分泌干扰物生物活性

来源：评论

学校读者我要写书评

暂无评论

Studies on Fe(II)/S2O82-- S2O32- degrading diuron in aqueous system

引用

Zhongguo Huanjing Kexue/China environmental Science 2008年第7期28卷 620-623页

作者： Zhang, Jin-Feng Yang, Xi Zheng, Wei Chen, Lei State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

In the aqueous system of initial pH value of 7.0 through orthogonal test and individual factor test, the optimal operation condition of Fe(II)/S2O82-- S2O32- degrading diuron was determined to be Na2S2O8 concentration 2.0 mmol/L, Fe(II) concentration 1.0 mmol/L, Na2S2O3 concentration 0.5 mmol/L under the condition of reaction time 120 min, 0.1 mmol/L diuron degradation rate reached 91.3%. The sulfate free racial and hydroxyl free radical produced in system were determined by molecular probes (ethanol and tert-butanol) methods, and the reaction mechanism of Fe(II)/S2O82-- S2O32- system produced sulfate free radical was discussed.

关键词： Diuron Fe(II) Hydroxyl free radical Persulfate Sulfate free radical Thiosulfate

来源：评论

学校读者我要写书评

暂无评论

Experimental study of bean stalks as bio-toilet conditioner for treating human feces

Experimental study of bean stalks as bio-toilet conditioner ...

引用

2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Liu, Yu-Ling Gao, Liang-Min Qian, Xin Lu, Gen-Fa School of Earth and Environment Science Anhui University of Science and Technology Huainan China State Key Laboratory of Pollution Control and Resource Reuse Environmental School Nanjing University Nanjing China

ISBN: (纸本)9781424417483

Employing S-15 - bio-toilet as the testing device and pulverized bean stalk particles as the conditioner, an experimental study is made on the aerobic reduction and changes of nutrient content of human feces. The index changes of PH value, organic matter, total nitrogen (TN), total phosphorus (TP) and total potassium (TK) etc. are measured. The results show that using bean stalks as the bio-toilet conditioner has a good treatment effect. The average decomposition rate of the dry weight of the mixture per week is 37.49% ,and the cumulative decomposition rate reaches 95.23%. In the resulting products, the PH value is 7.2, the total amount of organic matter is 71.02% and the content of TN, TP and TK is 3.72%, 1.53% and 4.71%, respectively. The resulting products can be recycled as an efficient organic fertilizer.

关键词： Biological materials

来源：评论

学校读者我要写书评

暂无评论

Approach to study bio-kinetic parameters in wastewater biofllms

引用

Zhongguo Huanjing Kexue/China environmental Science 2008年第8期28卷 679-682页

作者： Qiu, Yu-Qin Zhou, Xiao-Hong Shi, Han-Chang State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

When adequate substrate was provided to biofilm, the oxygen concentration in the biofilm became the only limited factor to the biofilm growth, under this condition, a separated oxygen microelectrode was used as detecting tool to detect the oxygen distribution in the biofilm. Based on the diffusion-reaction equation under the stabilizating condition, biofilm kinetic parameters were calculated by the method of hunting step by step. The results of the biofilm kinetic parameters calculated were qmax=10 mg O2/(gVSS·h), Ko=l2 mg/L. Compared with the activated sladge system, the qmax was smaller and the ko was higher.

关键词： Biofilm Diffusion-reaction Kinetic parameter Microelectrod

来源：评论

学校读者我要写书评

暂无评论

Use of gamma-irradiation pretreatment for enhancement of anaerobic digestibility of sewage sludge

引用

Frontiers of environmental Science & Engineering 2008年第2期2卷 247-250页

作者： Shoujun YUAN Zheng ZHENG Yanyan MU Xin YU Yongfu ZHAO School of Civil Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093China Zhongan Zhihuan Technology Assessment Center Beijing 100022China

The effects of γ-irradiation pretreatment on anaerobic digestibility of sewage sludge was investigated in this *** like solid components,soluble components,and biogas production of anaerobic digestion experiment for sewage sludge were *** values of these parameters were compared before and after γ-irradiation *** solid(TS),volatile solid(VS),suspended solid(SS),volatile suspended solid(VSS),and average floc size of samples decreased after cirradiation ***,floc size distribution of sewage sludge shifted from 80–100 mm to 0–40 mm after γ-irradiation treatment at the doses from 0 to 30 kGy,which indicated the disintegration of sewage ***,microbe cells of sewage sludge were ruptured by γ-irradiation treatment,which resulted in the release of cytoplasm and increase of soluble chemical oxygen demand(SCOD).Both sludge disintegration and microbe cells rupture enhanced the subsequent anaerobic digestion process,which was demonstrated by the increase of accumulated biogas *** with digesters fed with none irradiated sludge,the accumulated biogas production increased 44,98,and 178 mL for digesters fed sludge irradiated at 2.48,6.51,and 11.24 kGy,*** results indicated that γ-irradiation pretreatment could effectively enhance anaerobic digestibility of sewage sludge,and correspondingly,could accelerate hydrolysis process,shorten sludge retention time of sludge anaerobic digestion process.

关键词： γ-irradiation solid components soluble components anaerobic digestibility

来源：评论

学校读者我要写书评

暂无评论

Comparison of chemical-biological flocculation process model based on artificial neural network

Comparison of chemical-biological flocculation process model...

引用

2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Huang, Tian-Yin Xia, Si-Qing Li, Ning Huang, Yong School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou China State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai China School of the Environment Jiangsu University Zhenjiang China

ISBN: (纸本)9781424417483

Based on the experimental research on a pilot units of the chemical-biological flocculation process, the multi-input multi-output (MIMO) model and the multi-input single-output (MISO) model have been built followed by the back-propagation (BP) artificial networks. Trained by the data (water temperatures, flocculant dosages, recycle ratio, CODCr, TP, SS, etc.) from the six different operating modes of the processes, all of the two models achieved convergence well. The data of another two operating modes was used for the model prediction. The relative errors of the MISO model prediction were lower than those of the MIMO model prediction;and all of relative errors from the MISO model prediction were less than 9.0 %. As a result, the MISO model is an easy-to-use modelling tool to obtain a quick preliminary assessment for the effluent quality prediction of the chemical-biological flocculation process. © 2008 IEEE.

关键词： Neural networks

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：