全文获取类型
收费全文 | 16561篇 |
免费 | 212篇 |
国内免费 | 143篇 |
专业分类
安全科学 | 516篇 |
废物处理 | 615篇 |
环保管理 | 2279篇 |
综合类 | 3201篇 |
基础理论 | 4125篇 |
环境理论 | 10篇 |
污染及防治 | 4049篇 |
评价与监测 | 1008篇 |
社会与环境 | 981篇 |
灾害及防治 | 132篇 |
出版年
2022年 | 125篇 |
2021年 | 136篇 |
2020年 | 122篇 |
2019年 | 140篇 |
2018年 | 215篇 |
2017年 | 271篇 |
2016年 | 356篇 |
2015年 | 309篇 |
2014年 | 400篇 |
2013年 | 1381篇 |
2012年 | 501篇 |
2011年 | 680篇 |
2010年 | 531篇 |
2009年 | 603篇 |
2008年 | 676篇 |
2007年 | 715篇 |
2006年 | 648篇 |
2005年 | 529篇 |
2004年 | 511篇 |
2003年 | 524篇 |
2002年 | 454篇 |
2001年 | 558篇 |
2000年 | 434篇 |
1999年 | 252篇 |
1998年 | 203篇 |
1997年 | 196篇 |
1996年 | 212篇 |
1995年 | 222篇 |
1994年 | 218篇 |
1993年 | 209篇 |
1992年 | 218篇 |
1991年 | 205篇 |
1990年 | 208篇 |
1989年 | 177篇 |
1988年 | 154篇 |
1987年 | 135篇 |
1986年 | 157篇 |
1985年 | 159篇 |
1984年 | 165篇 |
1983年 | 164篇 |
1982年 | 157篇 |
1981年 | 164篇 |
1980年 | 151篇 |
1979年 | 145篇 |
1978年 | 109篇 |
1977年 | 121篇 |
1974年 | 110篇 |
1973年 | 92篇 |
1972年 | 107篇 |
1971年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Anne DePiante Henriksen 《补救:环境净化治理成本、技术与工艺杂志》1997,7(3):39-61
This article illustrates how two different decision analysis (DA) methods can be used to assist in making environmental remediation decisions. The two DA methods are Multiattribute Utility Theory (MAUT) and the Analytic Hierarchy Process (AHP). MAUT and AHP differ greatly in their underlying philosophies. MAUT employs an interval scale and constructs utility functions that quantify the total utility to the decision maker of each technology alternative; AHP employs a ratio scale and uses pairwise comparisons to produce a final ranking of the alternatives that reflects the decision maker's comparative preferences. In this study, the same technology was ranked first by both methods; however, the remaining rankings did not agree. Also, statistical analysis indicated that some score differences may be statistically insignificant. These results are presented and discussed along with a comparison of the features, advantages, and disadvantages of these two DA approaches. 相似文献
6.
I Chu D C Villeneuve B McDonald V E Secours V E Valli 《Journal of environmental science and health. Part. B》1987,22(3):303-317
Pentachlorotoluene (PCT) and pentabromotoluene (PBT) are environmental contaminants detected in the Great Lakes ecosystem. In view of the paucity of toxicity data and the potential for human exposure, a subacute (28 day) and a subchronic (91 day) study were conducted in the rat. In the subacute study, groups of 10 male and 10 female rats were fed the diet containing PCT or PBT at 0, 0.5, 5.0, 50 or 500 ppm for 28-days. In the subchronic study, the group size was increased to 15, the dose levels were 0, 0.05, 0.5, 5.0, 50 and 500 ppm in the diet and the exposure period was 91 days. Growth rate and food consumption were not affected by exposure to either chemical in the subacute and subchronic study. Clinical observations revealed no abnormalities. Decreased hemoglobin was observed in female rats fed 5.0 ppm PCT and higher levels in the subacute (28 day) study. In the same study the hematocrit value and erythrocyte numbers of females fed 5.0 or 500 ppm PCT diets were significantly lower than the control. In both subacute and subchronic studies mild dose-dependent histopathological changes were observed in the thyroid, liver and kidney of rats fed PCT and PBT diets. In general male rats were more susceptible than females to the treatment of PCT and PBT. Based on these data, it was concluded that the no observable adverse effect level for PCT was 50 ppm in the diet (3.5 mg/kg b.w./day) and that of PBT was 5.0 ppm (0.35 mg/kg b.w./day). 相似文献
7.
8.
E Enan I G Berberian S el-Fiki M el-Masry O H Enan 《Journal of environmental science and health. Part. B》1987,22(2):149-170
Male Baladi rabbits were acutely and sub-chronically intoxicated with cyanofenphos and profenophos. The levels of cholesterol, triglycerides, B-lipoproteins and total proteins were determined in the serum, brain, spinal cord and sciatic nerve of rabbits. Moreover, the activities of alkaline phosphatase, acid phosphatase and glutamic-pyruvic transaminase were determined in the liver of the animals. The whole studies revealed that the biochemical constituents were highly affected by the tested insecticides. Also, the liver function suffered from adverse effects of the tested insecticides. 相似文献
9.
10.
E.W. Lees 《Natural resources forum》1993,17(4):288-293
Energy efficiency is often stated to be the most cost-effective measure for satisfying our energy demand with minimal environmental damage. However, the potential energy savings attainable in 'the real world' are frequently overestimated, as is shown in an industrial case study of the glass industry. Nevertheless, there are significant energy savings to be realized, and the role of new technologies in this is important. However, the key to the effective use of new technology for improved energy efficiency is good management and. for best effect, it must be integrated into the normal resource management activities of a company. 相似文献