首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   449篇
  免费   49篇
  国内免费   94篇
安全科学   65篇
废物处理   9篇
环保管理   97篇
综合类   228篇
基础理论   83篇
污染及防治   18篇
评价与监测   45篇
社会与环境   31篇
灾害及防治   16篇
  2023年   20篇
  2022年   12篇
  2021年   20篇
  2020年   17篇
  2019年   21篇
  2018年   23篇
  2017年   12篇
  2016年   18篇
  2015年   28篇
  2014年   22篇
  2013年   29篇
  2012年   36篇
  2011年   26篇
  2010年   23篇
  2009年   23篇
  2008年   17篇
  2007年   43篇
  2006年   24篇
  2005年   23篇
  2004年   16篇
  2003年   13篇
  2002年   15篇
  2001年   10篇
  2000年   7篇
  1999年   8篇
  1998年   9篇
  1997年   6篇
  1996年   6篇
  1995年   3篇
  1994年   7篇
  1993年   2篇
  1992年   4篇
  1991年   3篇
  1988年   2篇
  1987年   2篇
  1986年   2篇
  1984年   1篇
  1982年   2篇
  1981年   1篇
  1980年   5篇
  1979年   1篇
  1978年   4篇
  1977年   1篇
  1976年   4篇
  1975年   2篇
  1974年   1篇
  1973年   3篇
  1972年   6篇
  1971年   4篇
  1970年   1篇
排序方式: 共有592条查询结果,搜索用时 31 毫秒
41.
All economic sectors are associated with energy use; therefore, government organizations aim to supply sustainable energy for human needs and economic growth. In particular, increased environmental concerns of the public in Turkey have impacted policymaking for renewable energy (RE) management in Turkey. The primary objective for RE sources of the Turkish Ministry of Energy is to ensure that 30% of the share of electricity production is from RE resources in 2023. In this paper, the integrated multi-objective, multi-period linear programming model is presented to determine effective allocation of RE supply for seven different geographical regions in Turkey for the period of 2017 to 2024. The integrated model consists of two different stages. The first stage involves qualitative evaluations of RE sources for seven geographical regions. Analytical Hierarchy Process (AHP) is applied to determine criteria priorities and overall ratings of geographical regions across determined criteria for RE sources are computed. The second stage of the integrated model consists of a multi-objective, multi-period linear programming model. The proposed multi-objective linear programming model is coded in MPL (Mathematical Programming Language) and solved using the GUROBI 5.1.0 solver. The output of the integrated model presents the total supply amount of RE sources for geographical regions in planning period. The ε-constraints method is applied to compute the total supply amount of RE from geographical regions for the period of 2017 to 2024. In this study, a systematic decision-making model is generated to allocate renewable energy sources to the geographical regions. The presented model integrates qualitative evaluations and quantitative parameters of different geographical regions to determine the optimal supply amount of RE. The obtained results are consistent with the potential quantities of RE alternatives in geographical regions, regional specifications, and social requirements.  相似文献   
42.
ABSTRACT: Linear programming is the simplest of all the optimization techniques used in regional water quality management studies; but the technique can optimize only one goal. When there are multiple goals with the same or different priorities, goal programming is a useful decisionmaking tool. This paper illustrates the application of goal programming to a regional water quality management problem where the following two goals are considered: (1) minimize the total cost of waste treatment, and (2) maintain the water quality goals (dissolved oxygen) close to the minimum level stated in the stream standards.  相似文献   
43.
ABSTRACT: Decisionmaking associated with the Nation's 1.7 billion acres of forest and range land has become increasingly complicated because of the rise in competition for resource use and in the awareness of environmental and social effects. This system analysis approach uses four models to synthesize pertinent masses of information into measures of economic, environmental, and social impacts. The system results can be used to help evaluate alternative national programs. The models are:
44.
ABSTRACT. Unit hydrographs derived by using two methods, linear programming and least squares, are compared. Test data comprise rainfall and runoff information from four storms over the North Branch Potomac River near Cumberland, Maryland. The mathematical bases of these methods for unit-hydrograph derivation are explained. The linear programming method minimizes the sum of absolute deviations, and the least squares method minimizes the sum of the squares of deviations. Computer subroutines are readily available for application of these methods. The unit hydrographs derived with the two methods are practically the same for storms 2 and 3, but differ somewhat for storms 1 and 4. However, the reconstituted direct surface runoff hydrographs are similar to those observed with the exception of the hydrograph for storm 4 which had a relatively more non-uniform rainfall excess of a considerably larger duration.  相似文献   
45.
ABSTRACT: This paper describes a mathematical model, an algorithm and a computer program that were specially developed to study the problem of a water quality management system undergoing a rapidly increasing environmental stress. The model output will determine the locations, sizes and the timing of construction of new treatment plants plus an overall treatment plant operating policy so that environmental standards are maintained at a minimum cost. The model, as formulated, is a 0-1 mixed integer programming problem which is solved by decomposing it into a capital budgeting problem (solved by Little's branch and bound algorithm) and an operational policy problem (solved by linear programming). The coded algorithm (in FORTRAN 10) has been tested with a semi-realistic example.  相似文献   
46.
关于植物中氟化物测定结果的计算   总被引:1,自引:0,他引:1  
李运玲 《干旱环境监测》2001,15(3):189-190,F001
针对植物中氟化物测定时由于绘制校准曲线的标准溶液体积与分析样品的定容体积不一样而引出的结果计算时的某些问题,提出了正确的计算方法和建议。  相似文献   
47.
王雷 《干旱环境监测》2010,24(3):171-175
线性修正趋势分析法根据历年数据建立线性模型并进行修正,预测年度、季环境要素污染物变化情况,可应用于空气质量、水环境质量、噪声环境质量、污染源污染物排放等预警预测数据统计分析评价,为环境决策提供技术支持。本文通过实例论述了该方法在实际工作中的应用。  相似文献   
48.
戴家银  靳立军 《环境化学》1998,17(4):360-364
本文采用摇瓶法测定了14各甲酰苯胺类化合物的溶解度及正辛醇/水分配系数,二者之间具有较好的相关性,应用线性溶剂化相关方法获得的相关方程,能更好地预测测苯甲酰苯胺类化合物的的水溶解度和正辛醇/水分配系数。  相似文献   
49.
Safety and security are of paramount importance, it is important to optimize and improve the routes of trucks that carry hazardous materials. In this study, we not only ensure the risk in the network, but also consider the transportation cost and the factors such as buildings and emergency facilities around the routes. The Geographic Information System (GIS) is used to quantify the factors on each section in the network. We present an epsilon constrained multi-objective mixed-integer linear programming optimization model to find the robust and stable transportation optimization solutions. At the end, we complete a case analysis of the proposed methodology to determine the motorway segments in Jiangsu province, China and test the above algorithm on the network, which has 144 nodes and 388 sections. The results we get show that the factors of buildings play a very important role in the model, and the multi-objective mixed-integer linear optimization model is reasonable and performs good quality.  相似文献   
50.
基于数据驱动思想,以城市内部环境空气质量监测站点为研究对象,建立了目标站点与周边站点间PM2.5浓度、风向、风速、欧几里得距离等参数的多元线性关联回归模型,使用梯度下降算法学习得到各参数权重系数,计算得出周边站点对目标站点PM2.5传输贡献,并评估了模型的可行性.以北京市丰台花园(FT)为目标站点的应用研究结果显示,2016年FT站点PM2.5浓度为82μg/m3,周边站点大兴(DX)、房山(FS)、亦庄(YZ)、东四环(DS)、古城(GC)和万柳(WL)浓度分别为93,82,80,79,77,71μg/m3;FT站点PM2.5浓度与上一时刻周边站点WL、GC、DX、YZ的相关性分别为0.634、0.631、0.608和0.601,显示其对FT站点PM2.5污染传输显著;建立的4个季节关联回归模型RMSE值分别为13.22、11.74、12.51和13.22,PM2.5模拟浓度与监测浓度变化趋势一致,验证了模型的可行性;WL、DX、YZ、GC分别是对应春、夏、秋、冬4个季节对FT站点PM2.5污染传输贡献较大的站点,其贡献值分别为1.61%、1.71%、2.20%和8.57%.该模型解析的结果可为北京市未来城市规划、建设提供依据,提出的PM2.5传输多元线性关联回归方法同样可用来解析其他城市内部尺度PM2.5传输关联,为挖掘城市内部PM2.5传输路径、精准溯源提供基础.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号