全文获取类型
收费全文 | 1001篇 |
免费 | 55篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 56篇 |
废物处理 | 34篇 |
环保管理 | 224篇 |
综合类 | 115篇 |
基础理论 | 310篇 |
环境理论 | 3篇 |
污染及防治 | 195篇 |
评价与监测 | 58篇 |
社会与环境 | 43篇 |
灾害及防治 | 29篇 |
出版年
2023年 | 12篇 |
2022年 | 6篇 |
2021年 | 14篇 |
2020年 | 21篇 |
2019年 | 28篇 |
2018年 | 41篇 |
2017年 | 34篇 |
2016年 | 50篇 |
2015年 | 37篇 |
2014年 | 43篇 |
2013年 | 91篇 |
2012年 | 51篇 |
2011年 | 70篇 |
2010年 | 42篇 |
2009年 | 40篇 |
2008年 | 55篇 |
2007年 | 61篇 |
2006年 | 43篇 |
2005年 | 45篇 |
2004年 | 29篇 |
2003年 | 26篇 |
2002年 | 38篇 |
2001年 | 17篇 |
2000年 | 15篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 11篇 |
1995年 | 8篇 |
1994年 | 7篇 |
1993年 | 14篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 8篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1975年 | 5篇 |
1973年 | 2篇 |
1967年 | 2篇 |
1913年 | 1篇 |
排序方式: 共有1067条查询结果,搜索用时 46 毫秒
1.
2.
V. Thomas Parker 《Conservation biology》2002,16(5):1444-1446
3.
Henrietta M. Lidiard Joy E. Rae Andrew Parker 《Environmental geochemistry and health》1993,15(2-3):93-104
A number of Mn-oxide minerals in soils from a farm in North Devon have been tentatively identified using a combination of
advanced analytical techniques: scanning electron microscopy (SEM), scanning electron microprobe (SEMP), X-ray diffraction
(XRD) and bulk chemical analysis by wet digestion followed by inductively-coupled plasma spectrometry (ICP). The minerals
lithiophorite and hollandite are thought to occur throughout the study area although there is considerable geographical variation
in the proportions of minerals present. Bimessite, vernadite, romanechite, todorokite and cryptomelane may also be present,
although in smaller amounts.
The use of SEMP, together with a simple sorption experiment, has allowed a study of the extent of uptake of Co and Cu by different
Mn-oxide minerals. Lithiophorite appears to take up Co and Cu more effectively than hollandite within a pH range of 4–6. 相似文献
4.
5.
6.
7.
8.
Twenty-seven polycyclic aromatic compounds (PAC) including polycyclic aromatic hydrocarbons (PAH) and polycyclic aromatic sulphur heterocycles were analysed in muscle, liver and ovaries of cod (Gadus morhua) from the Northwest Atlantic. These PAC include the 16 PAH priority pollutants (EPA recommendation), alkylated naphthalenes, phenanthrene-anthracenes as well as dibenzothiophenes (DBT). Aromatics were undetectable in muscle. One of the analysed PAC was detected in one ovary and six in another ovary sample. Liver samples contained between 1 and 9 PAC. Of the parental PAH, only acenapthene (18 ng/g, dry weight), fluorene (28 ng/g) and chrysene (22 ng/g) were detected once each in two liver samples, while fluorene (72 ng/g) was detected once in one of the ovaries. C-2 DBT was the major component in ovaries and liver (8-86 ng/g), while C-3 and C-4 alkylated phenanthrene-anthracene (12-78 ng/g) were the next major components detected in the liver samples. This is the first detailed study of PAH and PAC in finfish from the Northwest Atlantic. 相似文献
9.
Two linked probes were used to determine the Huntington's disease status of the fetus conceived by a woman affected with the condition. The fetus was found to be unaffected with a certainty of 97 per cent. The ethical issues associated with presymptomatic testing were avoided since the mother presented with initial symptoms of Huntington's disease, but other psychological and ethical issues arose. The concerns of an affected woman planning a pregnancy, and the dilemmas involved in decision-making regarding prenatal diagnosis and possible selective abortion were exposed and explored with the patient and her husband. 相似文献
10.
We describe a new method for the post-mortem examination of the fetal central nervous system. The brain is immobilized in gelatin prior to ultrasonic examination. Correlation with prenatal ultrasound is excellent and subsequent pathological examination is enhanced and facilitated. 相似文献