全文获取类型
收费全文 | 24166篇 |
免费 | 1750篇 |
国内免费 | 4265篇 |
专业分类
安全科学 | 2755篇 |
废物处理 | 326篇 |
环保管理 | 3918篇 |
综合类 | 14275篇 |
基础理论 | 2696篇 |
环境理论 | 16篇 |
污染及防治 | 1538篇 |
评价与监测 | 1796篇 |
社会与环境 | 1793篇 |
灾害及防治 | 1068篇 |
出版年
2024年 | 89篇 |
2023年 | 341篇 |
2022年 | 589篇 |
2021年 | 778篇 |
2020年 | 766篇 |
2019年 | 660篇 |
2018年 | 573篇 |
2017年 | 802篇 |
2016年 | 902篇 |
2015年 | 1032篇 |
2014年 | 1106篇 |
2013年 | 1406篇 |
2012年 | 1614篇 |
2011年 | 1823篇 |
2010年 | 1362篇 |
2009年 | 1340篇 |
2008年 | 1110篇 |
2007年 | 1658篇 |
2006年 | 1678篇 |
2005年 | 1305篇 |
2004年 | 1121篇 |
2003年 | 1256篇 |
2002年 | 1033篇 |
2001年 | 901篇 |
2000年 | 858篇 |
1999年 | 730篇 |
1998年 | 556篇 |
1997年 | 465篇 |
1996年 | 395篇 |
1995年 | 345篇 |
1994年 | 330篇 |
1993年 | 269篇 |
1992年 | 220篇 |
1991年 | 168篇 |
1990年 | 118篇 |
1989年 | 63篇 |
1988年 | 55篇 |
1987年 | 47篇 |
1986年 | 33篇 |
1985年 | 40篇 |
1984年 | 20篇 |
1983年 | 19篇 |
1982年 | 27篇 |
1981年 | 29篇 |
1980年 | 21篇 |
1979年 | 21篇 |
1978年 | 20篇 |
1977年 | 16篇 |
1973年 | 16篇 |
1971年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
311.
重庆近11年大气混合层厚度研究 总被引:5,自引:0,他引:5
根据新闻颁国家标准GB/T13201-91的规定,计算了重庆地区近11年大气混合厚度,分析结果表明,重庆地区大气混合层厚度有明显日变化和季节变化,大气稳定度是混合层厚度的主要决定因子。 相似文献
312.
313.
Atmospheric particulate pollution of Lanzhou using magnetic measurements 总被引:13,自引:0,他引:13
1 IntroductionAtmosphericparticulateisoneofthemainatmosphericpollutantsinChina.Itmaybeharmfulitselfandcanactasacarrieroftoxicmatterswhichmayhaveremarkableimpactsonhumanhealthandatmosphericenvironmentquality.Combustionofcoal,whichstillservesasprimarye… 相似文献
314.
顾国培 《石油化工环境保护》1996,(4):40-46,55
镇海炼化股份有限公司化肥厂针对装置区噪声污染严重这一现状,积极开展噪声源防治工作经过几年来的噪声综合治理,提高了化肥厂噪声合格率,改善了厂区环境。 相似文献
315.
Much investigation supports a high incidence of disease and death rates when people live in ambient polluted air for a long time. Thus, the location of residential sites is important from a public health viewpoint. The method outlined in this paper is useful for determining the location of residential sites based on pollution sources assessment. 相似文献
316.
上海市大气中NMHC,NOx,O3和SO2变化规律 总被引:7,自引:0,他引:7
通过对上海市大气中光化学主要污染物如NMHC、NOx、O3及SO2等的日变化监测,发现NOx、O3的日浓度变化与气象条件密切相关,高浓度O3多出现在晴朗少云,气温较高的大气条件下同步监测发现,O3与NOx呈负相关,相关系数r=-0.785;dmj SO2gn NMHCe tve vb r ghd sh ud ,sh ud txi ovt r= 相似文献
317.
战略环境评价及其应用初探 总被引:1,自引:0,他引:1
概述了战略环境价的概念、产生原因、研究现状及其工作程序,结合川南矿肥工程项目对它进行了应用初探,提出了计划、规划层次SEA的方法和指标,并对我国环评工作提出了建议。 相似文献
318.
Prenatal counselling for fetal agenesis of the corpus callosum is difficult as the prognosis until now has been so uncertain. We have reviewed the current world English literature to provide the best probabilistic information for prospective parents. In total, there are 70 cases where the diagnosis was made prenatally. The diagnosis of apparently isolated agenesis of the corpus callosum (in the absence of other sonographically detectable anomalies) appears to carry an excellent prognosis, with an 85 per cent chance of a normal developmental outcome and a 15 per cent risk of handicap. Fetal karyotyping is recommended as there is a 1 in 10 risk of aneuploidy. If other anomalies are detected prenatally, the outcome is very poor. Termination of pregnancy is advised in these circumstances. 相似文献
319.
Mitigation and adaptation synergy in forest sector 总被引:1,自引:1,他引:1
N. H. Ravindranath 《Mitigation and Adaptation Strategies for Global Change》2007,12(5):843-853
Mitigation and adaptation are the two main strategies to address climate change. Mitigation and adaptation have been considered
separately in the global negotiations as well as literature. There is a realization on the need to explore and promote synergy
between mitigation and adaptation while addressing climate change. In this paper, an attempt is made to explore the synergy
between mitigation and adaptation by considering forest sector, which on the one hand is projected to be adversely impacted
under the projected climate change scenarios and on the other provide opportunities to mitigate climate change. Thus, the
potential and need for incorporating adaptation strategies and practices in mitigation projects is presented with a few examples.
Firstly, there is a need to ensure that mitigation programs or projects do not increase the vulnerability of forest ecosystems
and plantations. Secondly, several adaptation practices could be incorporated into mitigation projects to reduce vulnerability.
Further, many of the mitigation projects indeed reduce vulnerability and promote adaptation, for example; forest and biodiversity
conservation, protected area management and sustainable forestry. Also, many adaptation options such as urban forestry, soil
and water conservation and drought resistant varieties also contribute to mitigation of climate change. Thus, there is need
for research and field demonstration of synergy between mitigation and adaptation, so that the cost of addressing climate
change impacts can be reduced and co-benefits increased. 相似文献
320.