首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   140篇
  免费   3篇
安全科学   2篇
废物处理   2篇
环保管理   15篇
综合类   50篇
基础理论   20篇
污染及防治   40篇
评价与监测   6篇
社会与环境   8篇
  2023年   1篇
  2021年   4篇
  2020年   7篇
  2019年   1篇
  2018年   3篇
  2017年   11篇
  2016年   6篇
  2015年   3篇
  2014年   7篇
  2013年   8篇
  2012年   5篇
  2011年   8篇
  2010年   5篇
  2009年   6篇
  2008年   10篇
  2007年   6篇
  2006年   5篇
  2005年   7篇
  2004年   3篇
  2003年   8篇
  2002年   3篇
  2001年   2篇
  1998年   2篇
  1997年   1篇
  1995年   1篇
  1990年   2篇
  1988年   1篇
  1986年   1篇
  1985年   2篇
  1984年   2篇
  1983年   1篇
  1982年   1篇
  1963年   1篇
  1944年   4篇
  1943年   2篇
  1936年   1篇
  1935年   1篇
  1924年   1篇
排序方式: 共有143条查询结果,搜索用时 89 毫秒
141.
Niels Nyholm 《Chemosphere》1990,21(12):1477-1487
Manometric respirometry (UK-MITI test) was found convenient for biodegradability testing of poorly soluble chemicals. Various dispersion techniques were evaluated with anthraquinone (solid) and di-isooctylphtalate (liquid). Application on silica gel via a solvent (dichloromethane) was found generally suitable. Ultrasonic dispersion was found suitable only if a stable emulsion forms.  相似文献   
142.
In the light of the prevailing goal to keep global temperature increase below 2° and recent challenges to reach a global climate agreement in the near term, linking emissions trading schemes has emerged as a prominent complementing policy option. To this end, we explicitly assess (1) the macroeconomic welfare impacts and (2) the trade-based competitiveness effects of linking the European Union (EU) Emissions Trading Scheme in the year 2020. A stylized partial market analysis suggests that, independently of regional cost characteristics, the integration of emissions trading schemes (ETS) yields economic welfare gains for all participating regions. A computable general equilibrium analysis confirms these findings at the macroeconomic level: The economic efficiency losses from emissions regulation are diminished for both EU Member States and non-EU regions by linking ETS. However, the quantitative analysis suggests opposite trade-based incentives for linking up: while EU Member States improve their terms of trade by integrating with emerging ETS, non-EU linking candidates face competitiveness losses by linking. We conclude that, for non-EU regions, the attractiveness of linking ETS is a matter of priorities for economic welfare or international competitiveness. If these priorities are hierarchized in favor of welfare, the globalization of the carbon market could become a promising policy option complementing the efforts to reach a global climate agreement in 2015.  相似文献   
143.
Although sex pheromone communication in the genus Ostrinia (Lepidoptera: Crambidae) has been studied intensively, acoustic communication in this genus has not been explored. In this study, we report that male-produced ultrasound serves as a courtship song in the Asian corn borer moth, O. furnacalis. Upon landing close to a pheromone-releasing female, a male showed a series of courtship behaviors involving emission of ultrasound. The sounds were produced when the wings were vibrated quickly in an upright position. The male song was composed of chirps, i.e., groups of pulses (duration of a chirp = 58.9 ms, 8.8 pulses/chirp), with a broadband frequency of 25–100 kHz. In flight tunnel experiments, deaf and hearing females showed a significant difference in the incidence of three behavioral responses to courting males, i.e., immediate acceptance, acceptance after walking, and rejection. Deaf females showed more ‘rejection’ and less ‘acceptance after walking’ than hearing females, indicating that the detection of male-produced ultrasound plays an important role in the acceptance of a male. The findings are discussed in the context of exploitation of receiver bias and mate choice.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号