检索结果-内蒙古大学图书馆

Impact of land-cover and climate changes on runoff of the source regions of the Yellow River

Journal of Geographical Sciences 2004年第3期14卷 330-338页

作者：李道峰田英刘昌明 HAO Fanghua State Key Joint Laboratory of Environmental Simulation and Pollution Control Key Laboratory for Water and Sediment Sciences of Ministry of Education Institute of Water Sciences Beijing Normal University Beijing 100875 China Dept. of Civil Engineering The University of Hong Kong Hong Kong China State Key Joint Laboratory of Environmental Simulation and Pollution Control Key Laboratory for Water and Sediment Sciences of Ministry of Education Institute of Water Sciences Beijing Normal University Beijing 100875 ChinaInst. Of Geographic Sciences and Natural Resources ResearhCASBeijing 100101China

After dividing the source regions of the Yellow River into 38 sub-basins, thepaper made use of the SWAT model to simulate streamflow with validation and calibration of theobserved yearly and monthly runoff data from the Tangnag hydrological station, and simulationresults are satisfactory. Five land-cover scenario models and 24 sets of temperature andprecipitation combinations were established to simulate annual runoff and runoff depth underdifferent scenarios. The simulation shows that with the increasing of vegetation coverage annualrunoff increases and evapotranspiration decreases in the basin. When temperature decreases by 2℃and precipitation increases by 20%, catchment runoff will increase by 39.69%, which is the largestsituation among all scenarios.

关键词： distributed hydrological model source regions of the Yellow River scenariosimulation changing environment

来源：评论

学校读者我要写书评

暂无评论

Structural characteristics andoil-removal mechanisms of the adsorbentsmade from petrochemical sludge

引用

Journal of China University of Mining and Technology 2004年第2期14卷 170-173页

作者：刘建斌桑义敏谭文捷何绪文李发生 School of Environmental Science Beijing Normal University State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing 100875 China School of Chemical and Environmental Engineering CUMT Beijing 100083 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

A new type of carbon-inorganic absorbent with good oil-removing performance is prepared by sintering and activating petrochemical sludge. Of the absorbents prepared by three different methods (non-activated, vapor /840 ℃/6 h, CO2/1 000 ℃/2 h), the one prepared by the second method is the best in oil-removing, which can remove 60% of oil from petrochemical wastewater with a concentration of 76.42 mg/L. X-ray Diffraction (XRD) analysis shows that the constituents of the adsorbents are basically similar to those of inorganic granulating materials, such as SiO2, Al2O3, orthoclase feldspar, iron ore, etc. Composition analysis reveals that the activated absorbent has a large specific surface area with a high carbon content in activated compositions and a good oil-removing capability.

关键词： carbon-inorganic adsorbent granulating microstructure

来源：评论

学校读者我要写书评

暂无评论

PROPERTIES AND THERMODYNAMICS OF ADSORPTION OF BENZOIC ACID ONTO XAD-4 AND A WATER-COMPATIBLE HYPERCROSSLINKED ADSORBENT

引用

Chinese Journal of Polymer Science 2003年第3期21卷 317-324页

作者：刘福强 State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

The adsorption behavior of benzoic acid onto a water-compatible hypercrosslinked polymeric adsorbent NJ-8 wascompared with that onto macroporous Amberlite XAN-4. This paper focuses on the static equilibrium adsorption behaviors,the adsorption thermodynamics and the column dynamic adsorption profiles. Five isotherm models are used to fit the *** shows that the Freundlich equation can give a perfect fit. The specific surface area of NJ-8 is about as high as that ofAmberlite XAD-4, but the adsorbing capacity for benzoic acid on NJ-8 is about 14.9%-64.8% higher than that on AmberliteXAD-4, which is attributed to its microporous mechanism and partial polarity. The negative values of the adsorptionenthalpy are indicative of an exothermic process. Both enthalpy and free energy changes of adsorption manifest a physicalsorption process. The negative values of the adsorption entropy indicate that adsorption is well consistent with the restrictedmobilities and the configurations of the adsorbed molecules on the surface of the studied adsorbents with superficialheterogeneity. Both adsorbents were used in mini-column experiments to demonstrate the higher breakthrough adsorbing capacity of the hypercrosslinked polymeric adsorbent NJ-8 to benzoic acid, as compared with that of Amberlite XAD-4.

关键词： Hypercrosslinked polymeric adsorbent Benzoic acid Adsorption behaviors Thermodynamic properties Minicolumn adsorption

来源：评论

学校读者我要写书评

暂无评论

Distributions of dimethylsulfide in the Bohai Sea and Yellow Sea of China

引用

Journal of environmental Sciences 2003年第6期15卷 762-767页

作者： HU Min TANG Xiao-yan LI Jin-long MA Qi-ju State Joint Key Laboratory of Environmental Simulation and Pollution Control Center for Environmental Sciences Peking UniversityBeijing 100871China.

Dimethylsulfide(DMS) measurements in the surface seawater of China eastern coastline were conducted during March 9—10, 1993 in Bohai Sea along the cruise from Dalian to Tianjin and during September 24—25, 1994 in Yellow Sea along the cruise from Shanghai to Qingdao. On the cruise in Bohai Sea DMS concentrations varied from 0.11 to 2.63 nmol/L with an average of 1.31 nmol/L, while DMS flux was estimated to be 0.85 μmol/(m 2·d) with the range of 0.04—3.12 μmol/(m 2·d). On the cruise in Yellow Sea DMS concentrations varied from 0.95 to 7.48 nmol/L with an average of 2.89 nmol/L, and DMS flux was estimated to be 7.94 μmol/(m 2·d) with the range of 0.11—18.88 μmol/(m 2·d). Variations in DMS concentrations along the latitude in Yellow Sea were observed larger than those along the longitude in Bohai Sea. DMS concentrations and fluxes had a similar spatial trend both in Bohai Sea and Yellow Sea with the correlation coefficients of 0.75 and 0.64, respectively.

关键词： dimethylsulfide sea-to-air flux China Bohai Sea China Yellow Sea

来源：评论

学校读者我要写书评

暂无评论

Heterogeneous reactions on the surface of fine particles in the atmosphere

引用

Chinese Science Bulletin 2003年第21期48卷 2267-2276页

作者： DING Jie & ZHU Tong state key Joint laboratory of environmental simulation and pollution control, College of environmental Sciences, Peking University, Beijing 100871, China Correspondence should be addressed to Zhu Tong (e-mail:tzhu@ ***) State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences Peking University China

Fine particles play an important role in the atmosphere. Research on heterogeneous reactions on the surface of fine particles is one of the frontier areas of atmospheric science. In this paper, physical and chemical characteristics of fine particles in the atmosphere and the interactions between trace gases and fine particles are described, methods used in heterogeneous reactions research are discussed in detail, progress in the study of heterogeneous reactions on the surface of fine particles in the atmosphere is summarized, existing important questions are pointed out and future research directions are suggested.

关键词：细微颗粒大气科学多相反应空气动力学

来源：评论

学校读者我要写书评

暂无评论

RESEARCH ON HYDRODYNAMIC AND WATER QUALITY MODEL FOR TIDAL RIVER NETWORKS

引用

Journal of Hydrodynamics 2003年第2期15卷 64-70页

作者： Xu Zu xin, Lu Shi qiang School of environment Science and Engineering, state key laboratory of pollution control and Resource Reuse, Tongji University, Shanghai 200092, China School of Environment Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

Hydrodynamic and water quality model for tidal river network is set up withMIKE11 modeling system, according to the features of tidal river networks in plain area. The modelwas calibrated using the hydrological and water quality data of 1999, and the results show that thesimulated values agree with the measured data very well. This model is used to numerically analyzethe effects of low flow augmentation on hydrodynamic and water quality conditions of Suzhou *** simulation results show that the flow augmentation can increase net discharge of Suzhou Creekand improve its ability of re-aeration; and its concentration of dissolved oxygen in the rivernetworks can also increase correspondingly.

关键词： tidal river network water quality model suzhou creek low flow augmentation

来源：评论

学校读者我要写书评

暂无评论

QSAR Studies on the COX-2 Inhibition by 3,4-Diarylcycloxazolones Based on MEDV Descriptor

引用

Chinese Journal of Chemistry 2003年第11期21卷 1510-1516页

作者：刘树深崔世海尹大强施蕴渝王连生 State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing University Laboratory of Structural Biology University of Science and Technology of China

Selective inhibition of cyclooxygenase-2 (COX-2) might avoid the side effects of current available nonsteroidal antiinflammatory drugs while retaining their therapeutic efficacy. A novel variable selection and modeling method based on prediction is developed to construct the quantitative structure-activity relationships (QSAR) between the molecular electronegativity distance vector (MEDV) based on 13 atomic types and the biological activities of a set of selective cyclooxygenase-2 inhibitory molecules,3,4-diarylcycloxazolones (DAA) plus indomethacin,naproxen,and celecoxib. Using multiple linear regression,a 5-variable linear model is developed with the calibrated correlation coefficient of 0.9271 and root mean square error of 0.17 in modeling stage and the validated correlation coefficient of 0.9030 and root mean square error of 0.20 in leave-one-out validation step,respectively. To further test the predictive ability of the model,20 DAA compounds are picked up to construct a training set which is used to build a QSAR model and then the model is employed to predict the biological activities of the balance compounds. The predicted correlation coefficient and root mean square error are 0.9332 and 0.19, respectively.

关键词： variable selection molecular electronegativity distance vector 3 4-diarylcycloxazolones COX-2 inhibitor QSAR

来源：评论

学校读者我要写书评

暂无评论

Microbial dehalogenation of trichlorophenol by a bacterial consortium: characterization and mechanism

引用

Science China Chemistry 2003年第2期46卷 207-215页

作者：王建龙 Laboratory of Environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China

Chlorinated phenolic compounds are a class of toxic and refractory organic pollutants. The pollution caused by chlorophenols poses serious ecological and environmental problems. A stable bacterial consortium capable of reductively dechlorinating trichlorophenol was isolated using chlorophenol as the sole source of carbon and energy. The physiological characteristics of the mixed cultures were studied and the results show that the consortium could use pyruvate as the carbon and energy source. The fermentation of pyruvate, sulfate reduction and dechlorination process proceeded strictly in succession within this consortium. The effect of specific inhibitors on the dechlorinating activity of the consortium was investigated, and the results indicate that sulfate and molybdate (1 mmol/L) have a strong inhibitive influence on the dechlorination activity. Fluo-rescence in situ hybridization (FISH) technique was applied to analyzing the composition of the consortium and the results reveal that one major subpopulation within the consortium was phy-logenetically affiliated to gamma and delta subclass of Proteobacteria.

关键词： chlorophenol biodegradation sulfate-reducing bacteria methanogenic bacteria specific inhibitor persistent organic pollutants. Chlorinated aromatic compounds are a class of widely used toxic and refractory organic

来源：评论

学校读者我要写书评

暂无评论

Holographic QSAR of estradiol derivatives

引用

Chinese Science Bulletin 2003年第7期48卷 642-645页

作者： CUI Shihai, LIU Shushen, WANG Xiaodong & WANG Liansheng state key laboratory of pollution control and Resource Reuse, School of environment, Nanjing University, Nanjing 210093, China 1. State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210093 China

Holographic QSAR model is constructed to predict relative binding affinities of estradiol derivatives with lamb uterine estrogen receptor. The method does not require the generation of three-dimensional structure of the compounds. The factors that influence the quality of QSAR model are discussed. The result indicates that the model has good predictability and yields a high q2LOO value of 0.897. Compared to other QSAR methods, the HQSAR technique is suitable for use in screening large database of chemicals.

关键词：雌二醇衍生物全息结构性质相关性内分泌紊乱化合物紊药物分析

来源：评论

学校读者我要写书评

暂无评论

Multi-objective Modeling and Assessment of Partition Properties: A GA-Based Quantitative Structure-Property Relationship Approach

引用

Chinese Journal of Chemistry 2003年第9期21卷 1150-1158页

作者：印春生刘新会郭卫民刘树深韩朔睽王连生 School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 ChinaState Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210093 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210093 China Department of Applied Chemistry University Science and Technology of China Hefei Anhui 230026 China

In this work a multi-objective quantitative structure-property relationship (QSPR) analysis approach was reported based on the study on three partition properties of 50 aromatic sulfur-containing carboxylates. Here multi-objectives (properties) were taken as a vector for QSPR modeling. The quantitative correlations for partition properties were developed using a genetic algorithm-based variable-selection approach with quantum chemical descriptors derived from AM1-based calculations. With the QSPR models, the aqueous solubility, octanol/water partition coefficients and reversed-phase HPLC capacity factors of sulfur-containing compounds were estimated and predicted. Using GA-based multivariate linear regression with cross-validation procedure, a set of the most promising descriptors was selected from a pool of 28 quantum chemical semi-empirical descriptors, including steric and electronic types, to integrally build QSPR models. The selected molecular descriptors included the net charges on carboxyl group (Q OC), the 2nd power of net charges on nitrogen atoms (Q 2 N), the net atomic charge on the sulfur atoms (Q S), the van der Waals volume of molecule (V), the most positive net atomic charge on hydrogen atoms (Q H) and the measure of polarity and polarizability (π), which were main factors affecting the distribution processes of the compounds under study. The statistically best QSPR models of six descriptors were simultaneously obtained by GA-based linear regression analysis. With the selected descriptors and the QSPR equations, mechanisms of partition action of the Sulfur-containing carboxylates were able to be investigated and interpreted.

关键词： multi-objective QSPR partition property quantum chemical semi-empirical descriptor sulfur-containing carboxylate genetic algorithm

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：