全文获取类型
收费全文 | 173篇 |
免费 | 6篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 4篇 |
环保管理 | 53篇 |
综合类 | 44篇 |
基础理论 | 38篇 |
环境理论 | 2篇 |
污染及防治 | 24篇 |
评价与监测 | 5篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2022年 | 5篇 |
2021年 | 3篇 |
2020年 | 10篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 20篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 6篇 |
2007年 | 6篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 4篇 |
1999年 | 4篇 |
1996年 | 2篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1988年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1972年 | 1篇 |
1966年 | 2篇 |
1961年 | 1篇 |
1954年 | 1篇 |
1953年 | 1篇 |
1946年 | 1篇 |
1942年 | 1篇 |
1940年 | 1篇 |
1938年 | 2篇 |
1937年 | 3篇 |
1936年 | 1篇 |
1935年 | 1篇 |
1934年 | 2篇 |
1933年 | 2篇 |
1931年 | 2篇 |
1930年 | 1篇 |
1929年 | 3篇 |
1928年 | 2篇 |
1927年 | 1篇 |
1926年 | 1篇 |
1925年 | 1篇 |
1913年 | 1篇 |
排序方式: 共有182条查询结果,搜索用时 31 毫秒
111.
112.
113.
In what circumstances do organizations react to changes in their operating environment by adopting proportionate policy responses? And drawing on institutional theory, what expectations can we formulate in relation to the proportionality of policy responses to climate change? These two research questions frame this article, which seeks to make new connections between the emerging perspective of proportionality in policy-making and existing institutional theories. We find that institutional theories are well suited to formulating expectations concerning the (dis)proportionality of policy responses, but their explanatory power can be further improved by taking the characteristics of specific climate policy problems into account. While there are many different problems nested in the ‘meta’ problem of climate change, we find that most of them have characteristics which suggest that policy under-reactions are more, not less likely. Amongst institutional theories, rational choice institutionalism provides the clearest expectation that proportionate policy responses are unlikely. Policy entrepreneurship is identified as one obvious way in which to stimulate proportionate policy responses, through fostering new ways of thinking within organizations. 相似文献
114.
115.
116.
Jeffrey L. Jordan 《Journal of the American Water Resources Association》1994,30(5):871-877
ABSTRACT: Economic theory clearly indicates that the use of increasing rate structures will reduce the demand for water and produce monetary incentives for consumers to conserve. One problem with estimating the effectiveness of using rate structures as a conservation program is that they are usually accompanied by other conservation efforts. Thus, it is difficult to determine the effectiveness of any one conservation component. This paper examines the effectiveness of increasing rate structures in a situation where no other conservation program was introduced. The paper uses customer data from the Spalding County (Georgia) Water Authority where an increasing rate structure replaced a descending rate structure in January 1991. Since the imposition of the increasing rate structure, the number of customers has increased 21 percent while total water demand has gone up only 15 percent and per customer water use has declined 5 percent. The daily water use per connection has declined from 243 gallons in 1990 to 231 in 1993, and monthly use has gone from 7,381 gallons to 7,028 per connection over the same period. Statistical tests indicate that water consumption during the two periods was significantly different while weather factors were not. 相似文献
117.
Syed R. Qasim Andrew T. Armstrong John Corn Betty L. Jordan 《Journal of the American Water Resources Association》1980,16(3):522-531
ABSTRACT: Data were developed to determine the quality of water and bottom sediments in the Trinity River, and the mobility of various contaminants when bottom sediments were mixed with the river water under simulated dredging conditions. Thirteen sampling sites were selected. A number of chemical tests including heavy metals and pesticides were conducted on river water, elutriates, and bottom sediments. Statis bioassays using Daphnia magna were conducted on river water and elutriates. Results indicated that the river in the upper reach is grossly polluted due to discharge of waste water effluents from several large treatment plants. High concentrations of nitrogen, phosphorus, organic carbon, COD, heavy metals, and pesticides were found in water and bottom sediments. The concentrations of most of these pollutants exceeded the EPA recommended limits. Elutriation gave no consistent results, perhaps because of release or uptake of contaminants from the sediments. High mortality of D. magna were also recorded in the upper reach of the river. The quality of water and bottom sediments gradually improved in lower reaches. 相似文献
118.
Stout JH Trust KA Cochrane JF Suydam RS Quakenbush LT 《Environmental pollution (Barking, Essex : 1987)》2002,119(2):215-226
Population declines in four species of eider; common (Somateria mollissima), king (Somateria spectabilis), spectacled (Somateria fischeri) and Steller's (Polysticta stelleri), have raised concerns about exposure to contaminants. Livers and kidney tissues were collected from eiders in Alaska and Russia for organic and elemental analyses. Results showed that organochlorine and many elemental levels were below toxic thresholds; however, in many cases, cadmium, copper, lead and serenium appeared high relative to other waterfowl and may warrant concern. With the exception of lead, local anthropogenic sources for these elements are not known. Although adverse physiological responses have not been documented in eiders, these four elements cannot be ruled out as contaminants of potential concern for some eider species. 相似文献
119.
L. Meitner P. Jordan W. Grotrian I. Koppel A. Rosenheim 《Die Naturwissenschaften》1931,19(30):660-664
120.