全文获取类型
收费全文 | 13634篇 |
免费 | 42篇 |
国内免费 | 58篇 |
专业分类
安全科学 | 117篇 |
废物处理 | 948篇 |
环保管理 | 1689篇 |
综合类 | 1703篇 |
基础理论 | 3920篇 |
环境理论 | 4篇 |
污染及防治 | 2891篇 |
评价与监测 | 1291篇 |
社会与环境 | 1137篇 |
灾害及防治 | 34篇 |
出版年
2023年 | 40篇 |
2022年 | 105篇 |
2021年 | 132篇 |
2020年 | 72篇 |
2019年 | 65篇 |
2018年 | 1545篇 |
2017年 | 1458篇 |
2016年 | 1331篇 |
2015年 | 250篇 |
2014年 | 195篇 |
2013年 | 252篇 |
2012年 | 646篇 |
2011年 | 1567篇 |
2010年 | 877篇 |
2009年 | 781篇 |
2008年 | 1048篇 |
2007年 | 1399篇 |
2006年 | 158篇 |
2005年 | 191篇 |
2004年 | 259篇 |
2003年 | 250篇 |
2002年 | 241篇 |
2001年 | 151篇 |
2000年 | 69篇 |
1999年 | 49篇 |
1998年 | 38篇 |
1997年 | 46篇 |
1996年 | 32篇 |
1995年 | 49篇 |
1994年 | 35篇 |
1993年 | 15篇 |
1992年 | 25篇 |
1991年 | 36篇 |
1990年 | 20篇 |
1989年 | 28篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 12篇 |
1985年 | 15篇 |
1984年 | 25篇 |
1983年 | 19篇 |
1982年 | 15篇 |
1981年 | 15篇 |
1979年 | 14篇 |
1975年 | 6篇 |
1970年 | 10篇 |
1969年 | 6篇 |
1966年 | 6篇 |
1965年 | 6篇 |
1964年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
欧洲的氮状况 总被引:5,自引:0,他引:5
Klaas van Egmond Ton Bresser Lex Bouwman 《Ambio-人类环境杂志》2002,31(2):72-78
欧洲(不包括前苏联)的氮收支表明,欧洲氮循环加速的三个主要驱动力是肥料生产(14MtN/a)、矿物燃料燃烧及其它工业(3.3MtN/a)和各种产品中的氮输入(7.6MtN/a).本文估计了欧洲粮食、能源和工业产品系统中活性氮元素的各种泄漏,评估了它们对人类健康及水陆生态系统的影响.考虑到氮流转中的可能后果,未来欧洲有关封闭氮循环和减少活性氮泄漏的环境政策措施最好集中于三个主要驱动力.在确定氮排放上限和制定氯流控制的综合政策方面,如肥料使用、输入和氮水平,临界负载可能是非常有用的工具. 相似文献
73.
74.
Gamergates (i.e. mated reproductive workers) are mostly known from ant species within the Ponerinae. We report here the discovery of gamergates in two species of the subfamily Myrmicinae. Until now, mated reproductive females in colonies of myrmicine species have been considered morphologically distinct from the worker caste. However, in two species of the myrmicine Metapone (Metapone madagascarica and a newly discovered, not yet described Metapone species) all workers have six ovarioles and a spermatheca; and some of them are mated. There are no morphological differences between mated and non-mated workers. Field observations and laboratory studies indicate that colonies of the Metapone species can reproduce with gamergates only. 相似文献
75.
Although amphibians are highly vocal, they generally emit only a limited number of acoustic communication signals. We report here the extraordinarily rich vocal repertoire of Amolops tormotus, a ranid species in China. These frogs produce countless vocalizations, some of which share features of birdsong or primate calls, e.g., ultrasonic frequency components, multiple upward and downward FM sweeps, and sudden onset and offset of selective harmonic components within a call note. Frame-by-frame video analysis of the frog's calling behavior suggests the presence of two pairs of vocal sacs that may contribute to the remarkable call-note complexity in this species. Electronic supplementary material to this paper can be obtained by using the Springer LINK server located at http://dx.doi.org/10.1007/s00114-002-0335-x. 相似文献
76.
Aysen Müezzinoğlu Tolga Elbir Abdurrahman Bayram 《Environmental Engineering and Policy》1998,1(2):109-116
In this study, an inventory of air pollutant emission estimates from major air polluting sources in Turkey for period between 1985 and 2005 with 5-year intervals were estimated. Inventory covers anthropogenic sources of five major air pollutants of particulate matter, sulfur dioxide, carbon monoxide, nitrogen oxides and non-methane volatile organic compounds. Their break-down with respect to main activity sectors were shown and their distribution by the largest industrial source categories were worked out as annual estimates. This inventory and its analysis point to serious environmental implications of air pollutants and a need to develop a policy plan for reducing these emissions. 相似文献
77.
78.
79.
80.
Flamos Alexandros Anagnostopoulos Konstantinos Askounis Dimitris Psarras John Butzengeiger Sonja van der Gaast Wytze 《Mitigation and Adaptation Strategies for Global Change》2004,9(2):103-120
This paper presentse-SEREM (Smart Emission ReductionEstimation Manual), a cost-free, easilyaccessed and updated, web-based manual forestimating emission reductions from Joint Implementation (JI) andClean Development Mechanism (CDM) projects. e-SEREM's main functions arethe selection of a benchmark for a specificproject type in the power or heat sectorand the calculation of the annual andcumulative emission reductions accrued bythis project for its crediting lifetime.e-SEREM was developed in order to test itsapplicability and practicality in assistingproject developers and evaluators toelaborate baselines easily and calculatethe emission credits earned by candidate JIor CDM projects hosted in several countries. 相似文献