全文获取类型
收费全文 | 285篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 6篇 |
环保管理 | 11篇 |
综合类 | 193篇 |
基础理论 | 23篇 |
污染及防治 | 33篇 |
评价与监测 | 3篇 |
社会与环境 | 14篇 |
出版年
2022年 | 5篇 |
2018年 | 9篇 |
2015年 | 3篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 5篇 |
2009年 | 6篇 |
2008年 | 4篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1994年 | 3篇 |
1992年 | 5篇 |
1985年 | 3篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1967年 | 3篇 |
1963年 | 5篇 |
1962年 | 8篇 |
1961年 | 4篇 |
1960年 | 6篇 |
1959年 | 3篇 |
1958年 | 10篇 |
1957年 | 12篇 |
1956年 | 13篇 |
1955年 | 17篇 |
1954年 | 6篇 |
1953年 | 6篇 |
1952年 | 4篇 |
1950年 | 5篇 |
1942年 | 2篇 |
1941年 | 2篇 |
1939年 | 4篇 |
1938年 | 4篇 |
1937年 | 3篇 |
1935年 | 5篇 |
1933年 | 2篇 |
1931年 | 3篇 |
1930年 | 5篇 |
1929年 | 3篇 |
1924年 | 2篇 |
1922年 | 2篇 |
1920年 | 2篇 |
1913年 | 3篇 |
排序方式: 共有286条查询结果,搜索用时 15 毫秒
11.
12.
Phase relations between a circadian rhythm and its zeitgeber within the range of entrainment 总被引:1,自引:0,他引:1
The regular day-night changes in tissues, physiologic functions, and behavior of organisms are based on endogenous rhythmic processes which under constant conditions continue with periods slightly deviating from 24h. These ‘arcadian’ rhythms have properties of self-sustained oscillators. Under natural conditions, circadian rhythms are synchronized (entrained) to 24 h by periodic factors in the environment, the so-called ‘Zeitgebers’. In the laboratory, circadian rhythms can also be entrained to periods other than 24 h within certain limits. Data on the phase relationship between the circadian rhythm and an entraining light-dark cycle for vertebrates, insects, plants, and unicellular organisms are reviewed. 相似文献
13.
Hermann Comoé Robert Finger Dominique Barjolle 《Mitigation and Adaptation Strategies for Global Change》2014,19(2):123-142
This paper investigates threats to farm management in the northern and central region of Côte d’Ivoire, with a particular focus on climate-related threats. To this end, farmers’ perception and adaptation strategies for climate change have been analyzed. The data were collected from 205 respondents by means of the Focus Groups method, and they were evaluated using a framework analysis. The main reported threats related to the implementation of farming activities are the high cost of inputs and the lack of technical support, which are followed by diseases, insects, and climate variations (scarcity of rains, strong winds, and high temperature). We find that most farmers have a strong perception of changes in climatic conditions. Their perceived impacts on the local environment through evidences like the disappearance of certain farming practices, occurrence of new insects, and the disruption of key time reference periods. Farmers mainly attempt to adapt by adjusting their agricultural calendar, adopting new short-season varieties, and using mixed cropping. We find that the most influential factors for farmers’ adaptation behavior is lack of contact with extension services and the scarcity of rainfall. Our suggestions for future agricultural policies for better adaptation to climate change are to take into account farmers’ perception, to provide suitable climate forecast, and to improve local technical support. 相似文献
14.
15.
Hermann Zabel 《Environmental Sciences Europe》2000,12(3):121-121
16.
17.
18.
19.
20.