全文获取类型
收费全文 | 2999篇 |
免费 | 253篇 |
国内免费 | 583篇 |
专业分类
安全科学 | 362篇 |
废物处理 | 88篇 |
环保管理 | 712篇 |
综合类 | 1626篇 |
基础理论 | 303篇 |
环境理论 | 19篇 |
污染及防治 | 152篇 |
评价与监测 | 133篇 |
社会与环境 | 384篇 |
灾害及防治 | 56篇 |
出版年
2024年 | 13篇 |
2023年 | 57篇 |
2022年 | 80篇 |
2021年 | 106篇 |
2020年 | 141篇 |
2019年 | 128篇 |
2018年 | 128篇 |
2017年 | 194篇 |
2016年 | 223篇 |
2015年 | 203篇 |
2014年 | 149篇 |
2013年 | 335篇 |
2012年 | 258篇 |
2011年 | 313篇 |
2010年 | 214篇 |
2009年 | 168篇 |
2008年 | 126篇 |
2007年 | 162篇 |
2006年 | 136篇 |
2005年 | 98篇 |
2004年 | 71篇 |
2003年 | 82篇 |
2002年 | 53篇 |
2001年 | 64篇 |
2000年 | 57篇 |
1999年 | 54篇 |
1998年 | 26篇 |
1997年 | 25篇 |
1996年 | 25篇 |
1995年 | 14篇 |
1994年 | 26篇 |
1993年 | 11篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 9篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 10篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1971年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有3835条查询结果,搜索用时 15 毫秒
761.
762.
通过模拟试验修正非点源污染模型;利用GIS技术建立非点源污染信息数据库,并对研究区域和苏州河进行网格和河网概化;以CODCr为控制因子,根据各断面的水环境目标,计算其水环境容量,以确定其削减量.结果表明,为达到苏州河2010年总量控制目标,各种非点源污染均须不同程度地削减,以村镇用地和畜禽养殖的污染负荷削减为主,村镇和鱼塘的单位网格削减量较高.最后提出非点源污染的总量控制对策,寻求目标总量控制和容量总量控制的有机结合. 相似文献
763.
Pinho P Augusto S Martins-Loução MA Pereira MJ Soares A Máguas C Branquinho C 《Environmental pollution (Barking, Essex : 1987)》2008,154(3):380-389
With the aim of determining the main drivers of changes in nitrophytic and oligotrophic macro-lichen communities in an industrial region with a Mediterranean climate, we considered both land-cover types and atmospheric pollutants. We determined the relation between the abundance of nitrophytic and oligotrophic species with environmental factors considering the distance of influence of land-cover types. The results showed that oligotrophic species decreased in the proximity of artificial areas, barren land and agricultural areas, associated with higher concentrations of NO2 and Zn, and Ti, probably dust of industrial and agricultural origin. Nitrophytic species were positively related to all the mentioned land-cover types, and with higher concentrations of Fe and N. Magnesium, probably from ocean aerosols, was negatively related to oligotrophic species and positively to nitrophytic. 相似文献
764.
Validation of a hybrid life-cycle inventory analysis method 总被引:2,自引:0,他引:2
Crawford RH 《Journal of environmental management》2008,88(3):496-506
The life-cycle inventory analysis step of a life-cycle assessment (LCA) may currently suffer from several limitations, mainly concerned with the use of incomplete and unreliable data sources and methods of assessment. Many past LCA studies have used traditional inventory analysis methods, namely process analysis and input-output analysis. More recently, hybrid inventory analysis methods have been developed, combining these two traditional methods in an attempt to minimise their limitations. In light of recent improvements, these hybrid methods need to be compared and validated, as these too have been considered to have several limitations. This paper evaluates a recently developed hybrid inventory analysis method which aims to improve the limitations of previous methods. It was found that the truncation associated with process analysis can be up to 87%, reflecting the considerable shortcomings in the quantity of process data currently available. Capital inputs were found to account for up to 22% of the total inputs to a particular product. These findings suggest that current best-practice methods are sufficiently accurate for most typical applications, but this is heavily dependent upon data quality and availability. The use of input-output data assists in improving the system boundary completeness of life-cycle inventories. However, the use of input-output analysis alone does not always provide an accurate model for replacing process data. Further improvements in the quantity of process data currently available are needed to increase the reliability of life-cycle inventories. 相似文献
765.
Mhairi Aitken Seonaidh McDonald Peter Strachan 《Journal of Environmental Planning and Management》2008,51(6):777-799
There have been conflicting accounts of the role and influence of local opposition within planning application outcomes for wind power developments. There is an expanding literature that considers public responses to proposed renewable energy developments and much of this suggests that public opposition is a key factor in the slow growth in renewable energy capacity. However, this paper will show that local opposition groups' power over such planning processes is very limited, and in fact extends only so far as delaying an outcome. Through a thematic content analysis of objection letters to one particular proposed wind power development, the key issues raised in connection with the development will be highlighted. Subsequently, these issues will be compared with those discussed in the official report of the planning appeals process, and it will be shown that the concerns of local objectors had little influence over the eventual verdict. 相似文献
766.
毛竹林各组分能量估算模型的研究 总被引:5,自引:0,他引:5
在建瓯设置40块毛竹林标准地,分别测定了毛竹单株各部分干重与能量,建立了各部分生物量模型,并在此基础上,运用人工神经网络方法对毛竹林各组分能量进行估测.结果表明毛竹林各组分秆、枝叶和地下部分的平均能量依次为4.23225×10 相似文献
767.
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
768.
769.
770.
能源规划环境影响评价内容框架实践与探讨 总被引:1,自引:0,他引:1
规划环评是环评领域一个新方向。虽然环评法已经实施,但目前在实际执行过程中,对编制的规划如何按照规划环评导则组织规划环评以及对规划环评思路和内容框架尚没有具体的研究。从实践出发并结合环境与发展综合决策的角度,以浙江省2010年电力发展规划及2020年展望的能源类规划环评为案例,对能源类规划环评的内容框架作初步研究。 相似文献