全文获取类型
收费全文 | 735篇 |
免费 | 3篇 |
国内免费 | 31篇 |
专业分类
安全科学 | 22篇 |
废物处理 | 32篇 |
环保管理 | 47篇 |
综合类 | 231篇 |
基础理论 | 185篇 |
污染及防治 | 203篇 |
评价与监测 | 32篇 |
社会与环境 | 17篇 |
出版年
2021年 | 5篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 13篇 |
2016年 | 28篇 |
2015年 | 12篇 |
2014年 | 16篇 |
2013年 | 41篇 |
2012年 | 33篇 |
2011年 | 45篇 |
2010年 | 25篇 |
2009年 | 32篇 |
2008年 | 35篇 |
2007年 | 43篇 |
2006年 | 51篇 |
2005年 | 30篇 |
2004年 | 16篇 |
2003年 | 22篇 |
2002年 | 16篇 |
2001年 | 18篇 |
2000年 | 11篇 |
1999年 | 21篇 |
1998年 | 11篇 |
1997年 | 11篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 10篇 |
1993年 | 9篇 |
1991年 | 5篇 |
1989年 | 5篇 |
1983年 | 6篇 |
1979年 | 3篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1967年 | 3篇 |
1966年 | 10篇 |
1965年 | 4篇 |
1964年 | 10篇 |
1963年 | 7篇 |
1962年 | 3篇 |
1961年 | 5篇 |
1960年 | 7篇 |
1959年 | 5篇 |
1958年 | 3篇 |
1957年 | 7篇 |
1956年 | 5篇 |
1955年 | 6篇 |
1954年 | 6篇 |
1953年 | 7篇 |
1950年 | 3篇 |
排序方式: 共有769条查询结果,搜索用时 203 毫秒
181.
Peter Witzgall Jean-Pierre Chambon Marie Bengtsson C. Rikard Unelius Monica Appelgren Gyorgy Makranczy N. Muraleedharan Darwin W. Reed Klaus Hellrigl Hans-Ruedi Buser Eric Hallberg Gunnar Bergström Miklos Tóth Christer Löfstedt Jan Löfqvist 《Chemoecology》1996,7(1):13-23
Summary The geometric isomers (E,E)-, (E,Z)-, (Z,E)-, and (Z,Z)-8,10-dodecadien-1-yl acetate were identified as sex pheromone components or sex attractants in the tribes Eucosmini and Grapholitini of the tortricid subfamily Olethreutinae. Species belonging to the more ancestral Tortricinae were not attracted. Each one isomer was behaviourally active in males ofCydia andGrapholita (Grapholitini), either as main pheromone compound, attraction synergist or attraction inhibitor. Their reciprocal attractive/antagonistic activity in a number of species enables specific communication with these four compounds.Pammene, as well as otherGrapholita andCydia responded to the monoenic 8- or 10-dodecen-1-yl acetates. Of the tribes Olethreutini and Eucosmini,Hedya, Epiblema, Eucosma, andNotocelia trimaculana were also attracted to 8,10-dodecadien-1-yl acetates, but several otherNotocelia to 10,12-tetradecadien-1-yl acetates. The female sex pheromones ofC. fagiglandana, C. pyrivora, C. splendana, Epiblema foenella andNotocelia roborana were identified. (E,E)- and (E,Z)-8,10-dodecadien-1-yl acetate are producedvia a commonE9 desaturation pathway inC. splendana. CallingC. nigricana andC. fagiglandana females are attracted to wingfanning males. 相似文献
182.
183.
184.
185.
186.
187.
Regeneration of pure water is an important issue not only for the healthy life but also for the fine control of precise processes in various industries.One important issue in ultrahigh purified water is to reduce the amount of total organic carbon(TOC).Herein,we introduce a new approach to reduce the TOC using the surface silanized nanoparticles,in which the magnetic nanoparticles(mNPs) are silanized and then complexed with ion exchange resin(IER) beads.The Fe_3O_4 mNPs are surface modified by using high concentrated vinyltrimethoxysilane(VTMS) and then adhered on the surface of IER beads.The surface modified mNPs have a thick-shell of polysiloxane layer varying from 5 to 22 nm depending on the amount of VTMS used,which leads the significant increase of specific surface area.The IER beads embedding VTMS-silanized mNPs achieves about 7 μg/L of the TOC level in ultrapure water system,which is two orders less than 228 μg/L of the feeding water and one order less than 96 μg/L from the system using pristine IER beads.This result is mainly attributed to the polysiloxane layer forming broccoli-like surface structure and some part by the vinyl group of VTMS exposed to the amines in the water. 相似文献
188.
189.
190.
The Science of Nature - 相似文献