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   428篇
  免费   3篇
  国内免费   9篇
安全科学   5篇
废物处理   25篇
环保管理   29篇
综合类   84篇
基础理论   78篇
污染及防治   155篇
评价与监测   36篇
社会与环境   24篇
灾害及防治   4篇
  2023年   4篇
  2022年   20篇
  2021年   12篇
  2020年   4篇
  2019年   6篇
  2018年   16篇
  2017年   19篇
  2016年   26篇
  2015年   17篇
  2014年   25篇
  2013年   27篇
  2012年   30篇
  2011年   43篇
  2010年   24篇
  2009年   22篇
  2008年   23篇
  2007年   37篇
  2006年   20篇
  2005年   20篇
  2004年   12篇
  2003年   8篇
  2002年   9篇
  2001年   1篇
  2000年   4篇
  1997年   1篇
  1996年   3篇
  1995年   2篇
  1994年   3篇
  1993年   1篇
  1982年   1篇
排序方式: 共有440条查询结果,搜索用时 15 毫秒
431.
In goitred gazelles (Gazella subgutturosa), sexual dimorphism of larynx size and position is reminiscent of the case in humans, suggesting shared features of vocal ontogenesis in both species. This study investigates the ontogeny of nasal and oral calls in 23 (10 male and 13 female) individually identified goitred gazelles from shortly after birth up to adolescence. The fundamental frequency (f0) and formants were measured as the acoustic correlates of the developing sexual dimorphism. Settings for LPC analysis of formants were based on anatomical dissections of 5 specimens. Along ontogenesis, compared to females, male f0 was consistently lower both in oral and nasal calls and male formants were lower in oral calls, whereas the first two formants of nasal calls did not differ between sexes. In goitred gazelles, significant sex differences in f0 and formants appeared as early as the second week of life, while in humans they emerge only before puberty. This result suggests different pathways of vocal ontogenesis in the goitred gazelles and in humans.  相似文献   
432.
Environmental Science and Pollution Research - Sharks are top predators and play an important role in the regulation of marine ecosystems at lower trophic position. Mustelus californicus, Sphyrna...  相似文献   
433.
Environmental Science and Pollution Research - This study investigated the occurrence of selected metals and metalloids (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) in radio-dated sediment cores from a coastal...  相似文献   
434.
Journal of Polymers and the Environment - In this work new biodegradable composite materials based on poly(butylene-adipate-co-terephthalate) (PBAT) reinforced with water-soluble calcium-phosphate...  相似文献   
435.
Journal of Polymers and the Environment - Grape pomace, as by-product of wine making, is a source of polyphenols, fibers, fatty acids, metals, and organic acids, which could be used as raw...  相似文献   
436.
437.
Environmental Science and Pollution Research - Pethoxamid is chloroacetamide herbicide. Pethoxamid is commonly used to kill different weeds in various crops. Pethoxamid can leach in the water and...  相似文献   
438.
439.
Journal of Polymers and the Environment - Bio-based non-isocyanate poly(hydroxyurethanes) (NIPUs) have recently gained significant interest due to increasing awareness of the health and...  相似文献   
440.
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