全文获取类型
收费全文 | 1055篇 |
免费 | 3篇 |
国内免费 | 14篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 21篇 |
环保管理 | 62篇 |
综合类 | 539篇 |
基础理论 | 168篇 |
环境理论 | 3篇 |
污染及防治 | 199篇 |
评价与监测 | 31篇 |
社会与环境 | 31篇 |
灾害及防治 | 4篇 |
出版年
2019年 | 10篇 |
2018年 | 20篇 |
2017年 | 30篇 |
2016年 | 12篇 |
2015年 | 18篇 |
2014年 | 12篇 |
2013年 | 48篇 |
2012年 | 24篇 |
2011年 | 34篇 |
2010年 | 30篇 |
2009年 | 30篇 |
2008年 | 32篇 |
2007年 | 33篇 |
2006年 | 21篇 |
2005年 | 14篇 |
2004年 | 14篇 |
2003年 | 24篇 |
2002年 | 27篇 |
2001年 | 14篇 |
2000年 | 9篇 |
1999年 | 24篇 |
1998年 | 12篇 |
1996年 | 15篇 |
1995年 | 10篇 |
1994年 | 12篇 |
1992年 | 11篇 |
1991年 | 11篇 |
1990年 | 16篇 |
1989年 | 14篇 |
1981年 | 9篇 |
1979年 | 10篇 |
1978年 | 10篇 |
1973年 | 12篇 |
1966年 | 10篇 |
1965年 | 12篇 |
1964年 | 11篇 |
1963年 | 9篇 |
1962年 | 10篇 |
1961年 | 15篇 |
1960年 | 11篇 |
1958年 | 9篇 |
1957年 | 11篇 |
1955年 | 9篇 |
1954年 | 9篇 |
1941年 | 9篇 |
1940年 | 9篇 |
1937年 | 13篇 |
1936年 | 10篇 |
1935年 | 9篇 |
1934年 | 11篇 |
排序方式: 共有1072条查询结果,搜索用时 31 毫秒
1.
Jürgen Breitung Dirk Bruns-Nagel Eberhard von Löw Klaus Steinbach Lothar Kaminski Rainer Haas Diethard Gemsa 《Environmental Sciences Europe》1995,7(4):195-200
Within the limits of a feasability study abouton-site bioremediation methods for TNT-contaminated soils, composting was chosen as a very promising and cheap method. This method was critically compared with those described in the literature and was primarily rated under ecotoxicological aspects. The investigated location is the former munition plant «Tanne» in the aerea of Clausthal-Zellerfeld in Lower Saxony, Germany. To estimate the autochtonic microflora, we assessed the number of aerobic heterotrophic bacteria and determined their respiration activity in soils. In addition, we isolated bacteria and examined their capacity to metabolize TNTin vitro. Both the amount of autochtonic microrganisms (4.7×108 to 1.2×1010 colony forming units (cfu)/kg dryweight) as well as their respiration activity did not correlate with the concentrations of nitrotoluenes in the soils. With high contaminated soil (20 g TNT/kg dry weight) we carried out a small compost in the range of 10 liters. During 28 days of composting TNT-concentration decrease over 90% and only minor amounts of monoaminodinitrotoluenes were generated. However, an acidic pretreatment of the compost material at the end of the reaction showed that TNT could be partially resolved under these extreme conditions and that an ecotoxicological risk may still exist. Possible changes in the realization of the composting process in order to make sure that the contaminants are savely bound to the humin matrix are discussed. 相似文献
2.
3.
Helena Nordström Källström Magnus Ljung 《Ambio-人类环境杂志》2005,34(4):370-376
社会层面在农业一食品系统的可持续发展中占中心地位.如果农民对他们的现状不满意或者丧失了继续从事农业的动力,那么现有的很多环境目标将不可能实现.在1997~2003年间,对社会可持续性、认可在农业系统中的重要性、行为者之间逐渐增加的合作的潜在作用进行了一些案例研究.研究的主要假定是,不断增加的社会认可是可持续社会环境的基础.我们的研究结果表明,现在许多农民认为他们社会地位低下.他们认为自己缺乏对决策的控制权,因而制约了他们继续从事农业生产的能力.公众对他们的印象和政治决策的制定过程都显得缺乏对农民技巧和知识的尊敬.但是,行为者之间日增曾的合作被认为是重大的进步,因为它创造了一个强大的关系网,给农民以一个较强势的身份.我们发现,在社会生态可持续性的合作学习和决策制定过程中最重要的是,农民需要官方和其它组织的支持、提供帮助,这样该过程才会更容易完成. 相似文献
4.
von Zweigbergk P Lindahl R Ostin A Ekman J Levin JO 《Journal of environmental monitoring : JEM》2002,4(5):663-666
A diffusive sampling method for determination of methyl isocyanate in air has been developed. A glass fibre filter impregnated with 1-(2-methoxyphenyl)piperazine in a commercially available diffusive sampling device was used to collect methyl isocyanate and the derivative formed was analysed with LC-MS/MS. The sampling rate was determined to be 15.6 ml min(-1), with a relative standard deviation of 7.3%. The sampler was validated for sampling periods from 15 min to 8 h, for relative humidities from 20% to 80% and for concentrations from I to 46 microg m(-3). A field validation was also made and the diffusive sampling results showed no difference compared to a pumped reference method. The impregnated filters have to be stored apart from the diffusive sampler housing and loaded into the sampler prior to each sampling. 相似文献
5.
Yu.M. Svirezhev W. von Bloh H.-J. Schellnhuber 《Environmental Modeling and Assessment》1999,4(4):287-294
A novel approach to the problem of estimating climate impact on social systems is suggested. This approach is based on a risk concept, where the notion of critical events is introduced and the probability of such events is estimated. The estimation considers both the inherent stochasticity of climatic processes and the artificial stochasticity of climate predictions due to scientific uncertainties. The method is worked out in some detail for the regional problem of crop production and the risks associated with global climate change, and illustrated by a case study (Kursk region of the FSU). In order to get local climatic characteristics (weather), a so-called statistical weather generator is used. One interesting finding is that the 3% risk level remains constant up to 1.0–1.1°C rise of mean seasonal temperature, if the variance does not change. On the other hand, the risk grows rapidly with increasing variance (even if the mean temperature rises very slowly). The risk approach is able to separate two problems: (i) assessment of global change impact, and (ii) decision making. The main task for the scientific community is to provide the politicians with different options; the choice of admissible (from the social point of view) critical events and the corresponding risk levels is the business of decision makers. 相似文献
6.
Bridget N. Bero Margrit C. von Braun Charles R. Knowles John E. Hammel 《Environmental monitoring and assessment》1995,36(2):123-138
The sampling of carpeted surfaces to test for lead contamination primarily focuses upon vacuum techniques. Vacuum sampling techniques, however, require time-consuming, expensive laboratory analysis of the dusts obtained and are unable to determine total lead load on the carpet. X-ray fluorescence (XRF) analysis is an on-site, inexpensive, non-destructive, quick technique for predicting metals levels in a variety of media, such as water, soil, filter paper and painted surfaces. A 1992 study of the feasibility of XRF to analyze for lead and soil loadings on carpeted surfaces indicated that XRF can detect lead at a low enough level to warrant further study. This paper expands this earlier study and developes lead and soil loading calibration curves for three different carpet types based upon XRF lead L-beta peak areas and XRF iron and barium K-alpha peak and background areas. Results indicate that variation in the data can be reduced through modifications of the XRF analysis technique, thus reducing the statistically determined detection level, and that carpet type does affect the calibration. Detection levels of approximately 70 mg/m2 for lead and 5 g/m2 for soil were obtained. Overall, good agreement was found between results of this study and the earlier one. XRF shows excellent potential for quantitative analysis of lead on carpeted surfaces. 相似文献
7.
8.
9.
10.