全文获取类型
收费全文 | 11806篇 |
免费 | 106篇 |
国内免费 | 743篇 |
专业分类
安全科学 | 176篇 |
废物处理 | 891篇 |
环保管理 | 1366篇 |
综合类 | 2167篇 |
基础理论 | 3473篇 |
污染及防治 | 2395篇 |
评价与监测 | 1079篇 |
社会与环境 | 951篇 |
灾害及防治 | 157篇 |
出版年
2023年 | 42篇 |
2022年 | 118篇 |
2021年 | 106篇 |
2020年 | 62篇 |
2019年 | 71篇 |
2018年 | 1542篇 |
2017年 | 1467篇 |
2016年 | 1294篇 |
2015年 | 262篇 |
2014年 | 172篇 |
2013年 | 230篇 |
2012年 | 632篇 |
2011年 | 1523篇 |
2010年 | 837篇 |
2009年 | 718篇 |
2008年 | 1023篇 |
2007年 | 1344篇 |
2006年 | 105篇 |
2005年 | 98篇 |
2004年 | 99篇 |
2003年 | 135篇 |
2002年 | 159篇 |
2001年 | 71篇 |
2000年 | 70篇 |
1999年 | 81篇 |
1998年 | 70篇 |
1997年 | 56篇 |
1996年 | 49篇 |
1995年 | 49篇 |
1994年 | 27篇 |
1993年 | 38篇 |
1992年 | 31篇 |
1991年 | 24篇 |
1990年 | 14篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1984年 | 14篇 |
1983年 | 8篇 |
1981年 | 2篇 |
1958年 | 1篇 |
1935年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
81.
Gottfried Tappeiner Ulrike Tappeiner Janette Walde 《Environmental Modeling and Assessment》2007,12(4):253-256
The complexity of today’s research problems increasingly demands that scientists move beyond the confines of their own discipline.
In this special issue, the basics of a transdisciplinary framework are established and problems analyzed in a specific discipline
are successfully integrated in this transdisciplinary network. The intent has been to go beyond only statements about the
importance of enabling early stage researchers to work across disciplinary boundaries, and to show that important discoveries
are being made at the intersection of disciplines. Embedding various research projects in a more global framework can meet
the demands of an interdisciplinary or transdisciplinary approach (especially for early stage researchers) and contribute
significantly to sustainable research. 相似文献
82.
A study on the orbit of air temperature movement 总被引:1,自引:0,他引:1
Zong-Chang Yang 《Environmental Modeling and Assessment》2007,12(2):131-143
In this paper, we describe an air temperature movement by mapping its time series to the polar coordinates: the value of the
time series is plotted on the radial coordinate and the time on the angular coordinate. In this way, both the yearly and daily
air temperature movements from five different locations of China are used to demonstrate that, in an intuitionistic view,
air temperature movement is neither random nor chaotic, but has its own orbit. We then propose an elliptic orbit model for
the air temperature movement. Our proposed model provides quite good results when it is applied to the evaluation of yearly
air temperature movements in eight locations in various parts of the world, and the evaluation of daily air temperature movements
in five locations in Hunan Province of China on December 17, 2005. Results show that our approach provides a concise and helpful
model for air temperature analysis. 相似文献
83.
根据塔里木油田1993-1996年环境空气监测数据,对其环境空气质量状况进行了分析和评价。 相似文献
84.
运用灰色系统理论,结合实例详细介绍了GM(1,1)模型在大气环境浓度预测中的应用。 相似文献
85.
Assessing land use impacts on flood processes in complex terrain by using GIS and modeling approach 总被引:1,自引:0,他引:1
Y. B. Liu F. De Smedt L. Hoffmann L. Pfister 《Environmental Modeling and Assessment》2005,9(4):227-235
A distributed hydrologic modeling and GIS approach is applied for the assessment of land use impact in the Steinsel sub-basin, Alzette, Grand-Duchy of Luxembourg. The assessment focuses on the runoff contributions from different land use classes and the potential impact of land use changes on runoff generation. The results show that the direct runoff from urban areas is dominant for a flood event compared with runoff from other land use areas in this catchment, and tends to increase for small floods and for the dry season floods, whereas the interflow from forested, pasture and agricultural field areas contributes to the recession flow. Significant variations in flood volume, peak discharge, time to the peak, etc., are found from the model simulation based on the three hypothetical land use change scenarios. 相似文献
86.
Application of a checklist for quality assistance in environmental modelling to an energy model 总被引:2,自引:0,他引:2
James Risbey Jeroen van der Sluijs Penny Kloprogge Jerry Ravetz Silvio Funtowicz Serafin Corral Quintana 《Environmental Modeling and Assessment》2005,10(1):63-79
Large, complex energy models present considerable challenges to develop and test. Uncertainty assessments of such models provide only partial guidance on the quality of the results. We have developed a model quality assistance checklist to aid in this purpose. The model checklist provides diagnostic output in the form of a set of pitfalls for the model application. The checklist is applied here to an energy model for the problem of assessing energy use and greenhouse gas emissions. Use of the checklist suggests that results on this issue are contingent on a number of assumptions that are highly value-laden. When these assumptions are held fixed, the model is deemed capable of producing moderately robust results of relevance to climate policy over the longer term. Checklist responses also indicate that a number of details critical to policy choices or outcomes on this issue are not captured in the model, and model results should therefore be supplemented with alternative analyses. 相似文献
87.
灰色系统模型在总悬浮物预测中的应用 总被引:1,自引:0,他引:1
以1986-1994年东北某城市总悬浮物统计资料为依据,应用灰色系统理论GM(1,1)模型对总量浮物数值进行预测分析。 相似文献
88.
余氯在pH6.5条件下与PADA发生显色反应,本文根据稳定悬浮颗粒对光的吸收行为研究选择波长测定水体中余氯,实验证明在450~515nm波长范围内任意选择两波长比色按照推导公式和模型计算余氯浓度,测定方便结果准确,且计算模型稳定,几乎不受操作环境影响。适合于废水和天然水的监测。 相似文献
89.
90.
多介质环境目标值的应用 总被引:1,自引:0,他引:1
本文概述了多介质目标德的SAM/Ⅰ的方法。多介质目标值包括环境目标值和排放目标值。点源分析包括SAM/ⅠA,SAM/ⅠB,SAM/Ⅰ,SAM/Ⅱ。在缺少环境质量标准的情况下,使用多介质环境目标值有较强的适用性,且具有省时、省力、经济等特点。本文将多介质目标值的SAM/ⅠA点源分析方法引入聚氯乙烯生产废水的环境评价中,取得较为满意的结果。 相似文献