全文获取类型
收费全文 | 4281篇 |
免费 | 31篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 85篇 |
废物处理 | 162篇 |
环保管理 | 204篇 |
综合类 | 1544篇 |
基础理论 | 889篇 |
环境理论 | 8篇 |
污染及防治 | 1050篇 |
评价与监测 | 203篇 |
社会与环境 | 170篇 |
灾害及防治 | 7篇 |
出版年
2022年 | 32篇 |
2019年 | 41篇 |
2018年 | 82篇 |
2017年 | 92篇 |
2016年 | 102篇 |
2015年 | 96篇 |
2014年 | 107篇 |
2013年 | 199篇 |
2012年 | 114篇 |
2011年 | 196篇 |
2010年 | 133篇 |
2009年 | 129篇 |
2008年 | 207篇 |
2007年 | 176篇 |
2006年 | 157篇 |
2005年 | 125篇 |
2004年 | 111篇 |
2003年 | 107篇 |
2002年 | 137篇 |
2001年 | 81篇 |
2000年 | 74篇 |
1999年 | 50篇 |
1998年 | 41篇 |
1997年 | 38篇 |
1996年 | 48篇 |
1995年 | 48篇 |
1994年 | 47篇 |
1993年 | 32篇 |
1992年 | 45篇 |
1991年 | 37篇 |
1990年 | 37篇 |
1989年 | 32篇 |
1981年 | 31篇 |
1976年 | 32篇 |
1973年 | 29篇 |
1968年 | 29篇 |
1967年 | 34篇 |
1966年 | 30篇 |
1965年 | 48篇 |
1964年 | 37篇 |
1963年 | 36篇 |
1962年 | 31篇 |
1961年 | 44篇 |
1960年 | 40篇 |
1959年 | 41篇 |
1958年 | 45篇 |
1957年 | 39篇 |
1956年 | 40篇 |
1955年 | 37篇 |
1954年 | 40篇 |
排序方式: 共有4322条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
Uncertainty is definitely one of the key topics in environmental assessment and management. Typically, attempts to reduce uncertainty are subject to expenses. But how to compare and trade-off expenses and the reduced uncertainty? They only seldom allow the use of a single unit. Instead, the whole analysis and decision procedure is very subjective. This paper presents one approach to handle such problems, namely the combined use of Bayesian influence diagrams, and probabilistic risk attitude analysis. The approach was used in the evaluation of three alternatives for a real time river water quality forecasting system. A trade-off analysis of risk attitudes, costs and uncertainty indicated the levels of socioeconomic utility required for investments in the respective systems, and accordingly illuminated the impact of the uncertainties involved on inference and decision-making with various risk attitudes and discount rates. 相似文献
6.
Development and validation of methods for environmental monitoring of cyclophosphamide in workplaces
Methods to monitor contamination of workplaces with antineoplastic drugs have been developed and validated. Cyclophosphamide (CP) was used as a model compound as it is one of the most commonly used antineoplastic drugs. A wipe sampling method to detect contamination with CP at surfaces was developed. A personal air sampling method to sample gas and vapour on solid sorbent tubes and particles with filters was also developed. Wipe and filter samples were extracted and sorbent samples were eluted, all with ethyl acetate. The samples were analysed with liquid chromatography tandem mass spectrometry. (2)H(6)-labelled cyclophosphamide was used as an internal standard. The between-day precision was 2-5% for wipe samples, 4-6% for sorbent samples and 3-8% for filter samples. The limit of detection was 0.02 ng CP per sample for the wipe and filter methods and 0.03 ng CP per sample for the solid sorbent method. Wipe sampling on surfaces made of different materials resulted in mean recoveries between 78-106%. The desorption recovery was between 97-102% for the wipe samples, 97% for the sorbent samples and 101% for the filter samples. Samples were stable for up to 2 months at 5 degrees C and -20 degrees C and for about 2 d at room temperature. The developed methods were applied to the measurement of contamination with CP in a hospital pharmacy. Trace amounts of CP, 1.3 and 1.4 ng, were detected on surfaces in the pharmacy. 相似文献
7.
B. Beck-Friis M. Pell U. Sonesson H. Jönsson H. Kirchmann 《Environmental monitoring and assessment》2000,62(3):317-331
Composting can be a source of N2O andCH4 production. In this investigation, differentcompost heaps of organic household waste weremonitored with the focus on potential formation ofCH4 and N2O in the heaps and emission ofthese gases from the heaps. The studied compost heapshad different compost ages, turning intervals andcompost sizes. The analysed compost gases containedbetween 1–3421 L of N2O-N L-1 and 0–470 mL of CH4 L-1. The emission rates ofN2O and CH4 from the compost heaps werebetween 1–1464 mg N2O m-2 day-1 and0–119 000 mg CH4 m-2 day-1. These verylarge differences in compost gas composition andemission indicate the importance of compostmanagement. The results also give an understanding ofwhere in the composting process an increasing emissionof N2O and CH4 can occur. 相似文献
8.
9.
The importance of selenium as an essential trace element has progressively emerged during the last years due to the analysis of selenium deficiency diseases and to the identification and characterization of a number of selenoenzymes. Selenium is incorporated in the catalytic site of the enzymes as an integral selenocysteine residue. The pathway of selenocysteine biosynthesis and incorporation has been elucidated recently for Escherichia coli. This article presents an overview on these subjects and describes the mechanisms which confer selenocysteine specificity in the framework of protein biosynthesis. In addition, some considerations concerning the phylogeny of selenocysteine incorporation are presented and a model for the evolution of the selenocysteine pathway is proposed. 相似文献
10.
Counselling in connection with prenatal diagnosis (PND) is a common task for the obstetrician and the midwife. However, the decision making processes of pregnant women are not completely known, for instance, the questions of women's autonomy, the decision on how to act in the case of an abnormal test, and the partner's participation in the decision. A questionnaire and interview study was carried out among 211 women undergoing PND by amniocentesis or chorionic villus biopsy. Most women in the sample indicated that PND was completely voluntary. However, at the same time almost every woman reported that it was difficult to decline from PND when offered. Even before the visit to register at the antenatal clinic, most of the women (83 per cent) had made up their minds to have PND. At the time of the test, many of the participants (62 per cent) had decided in favour of a legal abortion if the test indicated an abnormality in the fetus. At the same time, however, the data indicate a need for reflection and ambivalence, which the medical staff have to accept. In the questionnaire most of the women stated that they and their partners had similar attitudes towards PND, but when interviewed 38 per cent of the women admitted some differences between their own attitudes and their partners'. Although some women reported considerable deliberation and ambivalence, most of them said that they would undergo PND in another pregnancy. 相似文献