全文获取类型
收费全文 | 17865篇 |
免费 | 155篇 |
国内免费 | 122篇 |
专业分类
安全科学 | 427篇 |
废物处理 | 681篇 |
环保管理 | 2050篇 |
综合类 | 5383篇 |
基础理论 | 3707篇 |
环境理论 | 5篇 |
污染及防治 | 4245篇 |
评价与监测 | 930篇 |
社会与环境 | 645篇 |
灾害及防治 | 69篇 |
出版年
2018年 | 210篇 |
2017年 | 202篇 |
2016年 | 307篇 |
2015年 | 226篇 |
2014年 | 340篇 |
2013年 | 1245篇 |
2012年 | 385篇 |
2011年 | 547篇 |
2010年 | 513篇 |
2009年 | 578篇 |
2008年 | 595篇 |
2007年 | 632篇 |
2006年 | 549篇 |
2005年 | 486篇 |
2004年 | 519篇 |
2003年 | 479篇 |
2002年 | 458篇 |
2001年 | 623篇 |
2000年 | 427篇 |
1999年 | 291篇 |
1998年 | 208篇 |
1997年 | 199篇 |
1996年 | 201篇 |
1995年 | 239篇 |
1994年 | 256篇 |
1993年 | 209篇 |
1992年 | 231篇 |
1991年 | 237篇 |
1990年 | 257篇 |
1989年 | 232篇 |
1988年 | 185篇 |
1987年 | 186篇 |
1986年 | 185篇 |
1985年 | 187篇 |
1984年 | 208篇 |
1983年 | 192篇 |
1982年 | 202篇 |
1981年 | 217篇 |
1980年 | 175篇 |
1979年 | 185篇 |
1978年 | 151篇 |
1977年 | 142篇 |
1976年 | 141篇 |
1974年 | 150篇 |
1973年 | 147篇 |
1968年 | 157篇 |
1967年 | 184篇 |
1966年 | 154篇 |
1965年 | 148篇 |
1964年 | 151篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Pelgrom SM Lamers LP Lock RA Balm PH Bonga SE 《Environmental pollution (Barking, Essex : 1987)》1995,90(3):415-423
Sexually mature female tilapia were exposed to sublethal concentrations of waterborne Cu and/or Cd over 6 days, and subsequent body concentrations of these metals were determined in several organs. The results show that the distribution of Cu and Cd was metal and organ specific. This is demonstrated, for example, by the observation that in tilapia, Cu exposure did not result in Cu accumulation in the liver, whereas in the intestinal wall, notably high concentrations of Cu and Cd were measured in metal exposed fish. In addition to single metal exposed fish, we also determined Cu and Cd body distribution in Cu?Cd co-exposed fish. The observed interactions in metal accumulation were most pronounced in the organs of fish exposed to low, environmentally realistic, metal concentrations. 相似文献
42.
J. Altenburger Th. Dielacher P. Eder H. Ferner M. Fegerl J. Fresner O. Gelinek A. Kogler J. Jantschgi M. Nussbaumer B. Russegger H. Schnitzer K. Schauer B. Sebesta J. Seiler F. Sprenger H. Widenmeyer 《Journal of Cleaner Production》1994,2(3-4)
The paper focuses upon the organization of a federal state-funded pollution prevention project in the Styrian industry. The project includes 13 companies from the textile, pulp and paper, machine building, wood working and printed circuit board manufacturing industries, covering most of the sectors and sizes in the Styrian industry. It started in January 1994 and will last for one year. It will demonstrate the possibilities of pollution prevention and the need for further research work. This project will make use of the methods and tools that were refined in the Austrian Prepare project. As a first step, a systematic balance of all the inputs and outputs of a company is made, after which the weak points and inefficiencies of material and energy use are identified and the options for improvements, both economical and ecological, are defined. Consequently, modifications in products and production lead to a situation with less waste and emissions. The preliminary lessons from these projects are presented: as a rule, the utilities (consumption of process materials and water, cleaning, energy, preparatory and finishing steps) are treated as black boxes and usually represent a considerable optimization potential. In these areas especially there is usually a lack of information and coordination as well as a need for a systematic and comprehensive approach. Leadership in the company and creative consultants are needed for starting lasting successful pollution prevention projects. 相似文献
43.
The Science of Nature - 相似文献
44.
45.
The Science of Nature - 相似文献
46.
Defense Mechanisms of Arthropods, no. 96; no. 95: Eisner et al.: Chemoecology (in press) 相似文献
47.
48.
J. Heinze H. Remmert F. L. Boschke D. Reinen L. Jaenicke 《Die Naturwissenschaften》1983,70(11):575-576
49.
Pheromones — semiochemicals used by insects for intraspecific chemical communication — can be isolated and with special analytical techniques their chemical structure elucidated. With stereoselective synthesis methods, presented by the preparation of sex attractants and aggregating pheromones of moths and beetles, respectively, a synthetic access to compounds is given which can be used for behavior manipulation of insects. Aside the importance of these compounds for investigations of the sensoric process the possibility of their application in an integrated and biological pest control is discussed. 相似文献
50.