全文获取类型
收费全文 | 20477篇 |
免费 | 170篇 |
国内免费 | 118篇 |
专业分类
安全科学 | 469篇 |
废物处理 | 771篇 |
环保管理 | 2076篇 |
综合类 | 6347篇 |
基础理论 | 4284篇 |
环境理论 | 10篇 |
污染及防治 | 4949篇 |
评价与监测 | 1033篇 |
社会与环境 | 759篇 |
灾害及防治 | 67篇 |
出版年
2018年 | 273篇 |
2017年 | 264篇 |
2016年 | 368篇 |
2015年 | 294篇 |
2014年 | 408篇 |
2013年 | 1321篇 |
2012年 | 458篇 |
2011年 | 678篇 |
2010年 | 591篇 |
2009年 | 657篇 |
2008年 | 751篇 |
2007年 | 739篇 |
2006年 | 655篇 |
2005年 | 569篇 |
2004年 | 587篇 |
2003年 | 535篇 |
2002年 | 542篇 |
2001年 | 675篇 |
2000年 | 462篇 |
1999年 | 312篇 |
1998年 | 234篇 |
1997年 | 226篇 |
1996年 | 227篇 |
1995年 | 257篇 |
1994年 | 274篇 |
1993年 | 225篇 |
1992年 | 255篇 |
1991年 | 261篇 |
1990年 | 275篇 |
1989年 | 252篇 |
1988年 | 199篇 |
1987年 | 191篇 |
1986年 | 198篇 |
1985年 | 195篇 |
1984年 | 215篇 |
1983年 | 201篇 |
1982年 | 211篇 |
1981年 | 222篇 |
1980年 | 182篇 |
1979年 | 195篇 |
1978年 | 164篇 |
1976年 | 161篇 |
1974年 | 161篇 |
1973年 | 165篇 |
1968年 | 166篇 |
1967年 | 202篇 |
1966年 | 174篇 |
1965年 | 186篇 |
1964年 | 171篇 |
1963年 | 169篇 |
排序方式: 共有10000条查询结果,搜索用时 29 毫秒
1.
Rudra P. Pradhan Mahendhiran S. Nair Mak B. Arvin John H. Hall 《Natural resources forum》2023,47(3):435-483
This article postulates strong endogenous relationships in lower income countries between institutional quality, financial development and sustained economic growth. These associations were investigated using the vector-error correction model (VECM) and Granger causality method for a sample of 79 countries from 2005 to 2022. The findings show that (1) these variables reinforce each other in the short run. (2) In the long run, both institutional quality and financial development can fuel economic growth. (3) The positive effect of institutional quality on economic growth is greater than that of financial development. Policy implications of these findings are that careful attention should be paid to co-development policies to enhance the institutional quality and the financial system in these economies. Policies should also consider economic growth strategies to enable sustainable economic growth rates. 相似文献
2.
David M. Lapola José Maria C. da Silva Diego R. Braga Larissa Carpigiani Fernanda Ogawa Roger R. Torres Luis C. F. Barbosa Jean P. H. B. Ometto Carlos A. Joly 《Conservation biology》2020,34(2):427-437
Brazil hosts the largest expanse of tropical ecosystems within protected areas (PAs), which shelter biodiversity and support traditional human populations. We assessed the vulnerability to climate change of 993 terrestrial and coastal-marine Brazilian PAs by combining indicators of climatic-change hazard with indicators of PA resilience (size, native vegetation cover, and probability of climate-driven vegetation transition). This combination of indicators allows the identification of broad climate-change adaptation pathways. Seventeen PAs (20,611 km2) were highly vulnerable and located mainly in the Atlantic Forest (7 PAs), Cerrado (6), and the Amazon (4). Two hundred fifty-eight PAs (756,569 km2), located primarily in Amazonia, had a medium vulnerability. In the Amazon and western Cerrado, the projected severe climatic change and probability of climate-driven vegetation transition drove vulnerability up, despite the generally good conservation status of PAs. Over 80% of PAs of high or moderate vulnerability are managed by indigenous populations. Hence, besides the potential risks to biodiversity, the traditional knowledge and livelihoods of the people inhabiting these PAs may be threatened. In at least 870 PAs, primarily in the Atlantic Forest and Amazon, adaptation could happen with little or no intervention due to low climate-change hazard, high resilience status, or both. At least 20 PAs in the Atlantic Forest, Cerrado, and Amazonia should be targeted for stronger interventions (e.g., improvement of ecological connectivity), given their low resilience status. Despite being a first attempt to link vulnerability and adaptation in Brazilian PAs, we suggest that some of the PAs identified as highly or moderately vulnerable should be prioritized for testing potential adaptation strategies in the near future. 相似文献
3.
4.
5.
Large Estimates of Minimum Viable Population Sizes 总被引:2,自引:0,他引:2
6.
7.
8.
9.
Frank Eierdanz Joseph Alcamo Lilibeth Acosta-Michlik Dörthe Krömker Dennis Tänzler 《Regional Environmental Change》2008,8(4):197-205
This paper presents the technical aspects of a new methodology for assessing the susceptibility of society to drought. The
methodology consists of a combination of inference modelling and fuzzy logic applications. Four steps are followed: (1) model
input variables are selected—these variables reflect the main factors influencing susceptibility in a social group, population
or region, (2) fuzzification—the uncertainties of the input variables are made explicit by representing them as ‘fuzzy membership
functions’, (3) inference modelling—the input variables are used to construct a model made up of linguistic rules, and (4)
defuzzification—results from the model in linguistic form are translated into numerical form, also through the use of fuzzy
membership functions. The disadvantages and advantages of this methodology became apparent when it was applied to the assessment
of susceptibility from three disciplinary perspectives: Disadvantages include the difficulty in validating results and the
subjectivity involved with specifying fuzzy membership functions and the rules of the inference model. Advantages of the methodology
are its transparency, because all model assumptions have to be made explicit in the form of inference rules; its flexibility,
in that informal and expert knowledge can be incorporated through ‘fuzzy membership functions’ and through the rules in the
inference model; and its versatility, since numerical data can be converted to linguistic statements and vice versa through
the procedures of ‘fuzzification’ and ‘defuzzification’. 相似文献
10.
E Enan I G Berberian S el-Fiki M el-Masry O H Enan 《Journal of environmental science and health. Part. B》1987,22(2):149-170
Male Baladi rabbits were acutely and sub-chronically intoxicated with cyanofenphos and profenophos. The levels of cholesterol, triglycerides, B-lipoproteins and total proteins were determined in the serum, brain, spinal cord and sciatic nerve of rabbits. Moreover, the activities of alkaline phosphatase, acid phosphatase and glutamic-pyruvic transaminase were determined in the liver of the animals. The whole studies revealed that the biochemical constituents were highly affected by the tested insecticides. Also, the liver function suffered from adverse effects of the tested insecticides. 相似文献