首页 | 官方网站   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   224篇
  免费   1篇
  国内免费   2篇
环境安全   227篇
  2023年   2篇
  2022年   3篇
  2020年   2篇
  2019年   2篇
  2018年   2篇
  2016年   4篇
  2015年   2篇
  2014年   3篇
  2013年   6篇
  2012年   8篇
  2011年   7篇
  2010年   9篇
  2009年   11篇
  2008年   5篇
  2007年   15篇
  2006年   13篇
  2005年   6篇
  2004年   4篇
  2003年   9篇
  2002年   11篇
  2000年   4篇
  1999年   2篇
  1998年   3篇
  1997年   6篇
  1996年   6篇
  1995年   5篇
  1994年   5篇
  1993年   7篇
  1992年   3篇
  1991年   2篇
  1990年   5篇
  1988年   3篇
  1987年   2篇
  1986年   2篇
  1985年   2篇
  1983年   2篇
  1981年   2篇
  1976年   3篇
  1973年   2篇
  1966年   2篇
  1962年   2篇
  1961年   3篇
  1958年   3篇
  1956年   2篇
  1930年   2篇
  1923年   1篇
  1921年   1篇
  1916年   1篇
  1914年   2篇
  1913年   2篇
排序方式: 共有227条查询结果,搜索用时 15 毫秒
1.
2.
Immer nur Dinge?     
B.C. . Only with the experiment of Torricelli in 1644, however, did it become possible to distinguish questions of empty space clearly from implications of air pressure. The natural sciences subsequently developed on the basis of the ancient atomists‘ concept: the world is made up exclusively of unbreakable atoms and the empty space between them. In contrast to this, modern physics has confirmed another kind of ancient speculation to the effect that there cannot be empty space anywhere at any time. However, this approach has failed to answer the questions addressed with it. Beginning with a historical review, the article describes present-day answers to the ancient question of the void.  相似文献   
3.
4.
5.
6.
7.
8.
One of the most important endemic tree species of Chile and at the same time one of the most endangered ones is Araucaria araucana (Mol.) C. Koch, the monkey‐puzzle tree. It grows in the Andes Mountains, homeland of the indigenous Mapuche Pewenche people who depend on this tree. This paper is based on field research that investigated the ecological knowledge, uses and management of the Araucaria araucana forest by indigenous Mapuche Pewenche people based on the socio‐cultural, spiritual and ecological relationships they have with the Araucaria forest, to find out how indigenous people and their knowledge could contribute to sustainable Araucaria forest management. A Mapuche Pewenche community located in the IX region of Chile contributed to this study. Based on the analyses this paper illustrates the nature of indigenous ecological knowledge of Araucaria araucana on the one hand, and its utility in native forest management on the other. The research shows that the Mapuche Pewenche hold ecological knowledge and conduct practices to manage their Araucaria forest in a balanced way. They conserve and use forest biodiversity at one and the same time. This paper provides recommendations for sustainable Araucaria forest management and conservation strategies ex‐situ and in‐situ incorporating indigenous knowledge and scientific knowledge and for promoting a collaborative natural resources management.  相似文献   
9.
Many argue that monitoring conducted exclusively by scientists is insufficient to address ongoing environmental challenges. One solution entails the use of mobile digital devices in participatory monitoring (PM) programs. But how digital data entry affects programs with varying levels of stakeholder participation, from nonscientists collecting field data to nonscientists administering every step of a monitoring program, remains unclear. We reviewed the successes, in terms of management interventions and sustainability, of 107 monitoring programs described in the literature (hereafter programs) and compared these with case studies from our PM experiences in Australia, Canada, Ethiopia, Ghana, Greenland, and Vietnam (hereafter cases). Our literature review showed that participatory programs were less likely to use digital devices, and 2 of our 3 more participatory cases were also slow to adopt digital data entry. Programs that were participatory and used digital devices were more likely to report management actions, which was consistent with cases in Ethiopia, Greenland, and Australia. Programs engaging volunteers were more frequently reported as ongoing, but those involving digital data entry were less often sustained when data collectors were volunteers. For the Vietnamese and Canadian cases, sustainability was undermined by a mismatch in stakeholder objectives. In the Ghanaian case, complex field protocols diminished monitoring sustainability. Innovative technologies attract interest, but the foundation of effective participatory adaptive monitoring depends more on collaboratively defined questions, objectives, conceptual models, and monitoring approaches. When this foundation is built through effective partnerships, digital data entry can enable the collection of more data of higher quality. Without this foundation, or when implemented ineffectively or unnecessarily, digital data entry can be an additional expense that distracts from core monitoring objectives and undermines project sustainability. The appropriate role of digital data entry in PM likely depends more on the context in which it is used and less on the technology itself.  相似文献   
10.
In order to evaluate the leading and lagging effects of process safety climate on incidents, we correlated safety climate survey data with organizational safety records from before and after the survey time period. We obtained data from a large, multinational organization with manufacturing operations involving a number of complex processes, chemicals, and hazardous substances. A total of 7728 employees from 62 sites responded to a safety climate survey in 2007. Individual responses were aggregated to the site-level and matched to site-level organizational records of process safety incidents 1 year before and 1 year after survey administration. Employees’ perceptions of good routine housekeeping were significantly related to environmental impact incidents as both a leading and a lagging indicator, as well as fires/explosions and property damage outcomes. Employees’ perceptions of systems to prevent backlogs and the extent to which health and safety problems are promptly corrected were also related to environmental releases and fires/explosions. Implications for process safety climate research, organizational survey strategies, and organizational climate change are discussed.  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-23

京公网安备 11010802026262号