全文获取类型
收费全文 | 17554篇 |
免费 | 145篇 |
国内免费 | 114篇 |
专业分类
安全科学 | 426篇 |
废物处理 | 661篇 |
环保管理 | 1957篇 |
综合类 | 5397篇 |
基础理论 | 3617篇 |
环境理论 | 2篇 |
污染及防治 | 4157篇 |
评价与监测 | 896篇 |
社会与环境 | 637篇 |
灾害及防治 | 63篇 |
出版年
2018年 | 214篇 |
2017年 | 206篇 |
2016年 | 303篇 |
2015年 | 225篇 |
2014年 | 325篇 |
2013年 | 1183篇 |
2012年 | 383篇 |
2011年 | 534篇 |
2010年 | 506篇 |
2009年 | 566篇 |
2008年 | 581篇 |
2007年 | 611篇 |
2006年 | 540篇 |
2005年 | 472篇 |
2004年 | 508篇 |
2003年 | 462篇 |
2002年 | 443篇 |
2001年 | 620篇 |
2000年 | 414篇 |
1999年 | 284篇 |
1998年 | 203篇 |
1997年 | 199篇 |
1996年 | 195篇 |
1995年 | 236篇 |
1994年 | 243篇 |
1993年 | 207篇 |
1992年 | 223篇 |
1991年 | 235篇 |
1990年 | 256篇 |
1989年 | 232篇 |
1988年 | 184篇 |
1987年 | 184篇 |
1986年 | 181篇 |
1985年 | 182篇 |
1984年 | 199篇 |
1983年 | 187篇 |
1982年 | 195篇 |
1981年 | 209篇 |
1980年 | 169篇 |
1979年 | 181篇 |
1978年 | 149篇 |
1977年 | 139篇 |
1974年 | 147篇 |
1973年 | 146篇 |
1968年 | 156篇 |
1967年 | 184篇 |
1966年 | 154篇 |
1965年 | 148篇 |
1964年 | 151篇 |
1963年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
961.
In this paper we describe the use of five-colour fluorescence in situ hybridization for prenatal diagnosis of aneuploidy using uncultured amniotic fluid cells. The analysis is based on ratio mixing of dual-labelled probes and digital imaging for the detection and visualization of five different probes specific for the five target chromosomes, 13, 18, 21, X, and Y. A retrospective blind analysis of 30 coded uncultured amniotic fluid samples correctly detected fetal sex and five trisomy 21 cases. Multicolour fluorescence in situ hybridization used in this way allows rapid and simultaneous detection of the most frequent aneuploidies. 相似文献
962.
Aloys Hüttermann 《Die Naturwissenschaften》1993,80(4):147-156
963.
964.
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
965.
966.
967.
968.
969.
970.