全文获取类型
收费全文 | 512篇 |
免费 | 9篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 28篇 |
废物处理 | 27篇 |
环保管理 | 72篇 |
综合类 | 139篇 |
基础理论 | 75篇 |
污染及防治 | 92篇 |
评价与监测 | 65篇 |
社会与环境 | 23篇 |
灾害及防治 | 8篇 |
出版年
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 10篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 16篇 |
2017年 | 14篇 |
2016年 | 16篇 |
2015年 | 16篇 |
2014年 | 15篇 |
2013年 | 38篇 |
2012年 | 19篇 |
2011年 | 18篇 |
2010年 | 14篇 |
2009年 | 23篇 |
2008年 | 16篇 |
2007年 | 26篇 |
2006年 | 15篇 |
2005年 | 21篇 |
2004年 | 10篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 10篇 |
2000年 | 17篇 |
1999年 | 10篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 14篇 |
1992年 | 8篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1985年 | 3篇 |
1983年 | 3篇 |
1976年 | 7篇 |
1975年 | 3篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1964年 | 4篇 |
1963年 | 4篇 |
1960年 | 3篇 |
1956年 | 3篇 |
1952年 | 3篇 |
1950年 | 5篇 |
1932年 | 3篇 |
1930年 | 4篇 |
1926年 | 2篇 |
1925年 | 2篇 |
排序方式: 共有529条查询结果,搜索用时 515 毫秒
51.
52.
53.
54.
Because they are used in a number of commercial preparations phenoxyacetic acids and their salts can occur in wastewater. During their degradation genotoxic substances may be created. The results of investigations of biodegradability and genotoxicity of some phenoxyherbicides are presented. Commercial formulations of 2,4-D (Aminopielik 720) and MCPA (Chwastox Extra) were the substrates studied. Biodegradation tests were conducted according to OECD guidelines for testing of chemicals--confirmatory test (OECD Method 303 A). Genotoxicity tests were conducted with Bacillus subtilis strains according to the method of [Chemical Mutagens, vol. 6, Plenum Press. New York, 1980, p. 149]. Genotoxicity of biodegradation products was also studied. Both commercial formulations were biodegradable. Aminopielik 720 was potentially genotoxic but only at great concentrations while Chwastox Extra was not genotoxic. Biodegradation products of neither compound were genotoxic. 相似文献
55.
Compliance and Emissions Trading under the Kyoto Protocol: Rules for Uncertain Inventories 总被引:1,自引:0,他引:1
Zbigniew Nahorski Joanna Horabik Matthias Jonas 《Water, Air, & Soil Pollution: Focus》2007,7(4-5):539-558
A solution is proposed for proving compliance with emission targets and for emissions trading in the event of uncertainties
in reported emission inventories. The solution is based on the undershooting concept, from which the mathematical conditions
for both proving compliance with a risk α and calculating effective emissions for trading are derived. Based on the reported emission units, the number of permits
granted is reduced in proportion to the uncertainty in the inventory. A country whose inventory has higher uncertainty is
thereby allotted fewer permits than a country with the same inventory but smaller uncertainty. 相似文献
56.
Joanna Burger 《补救:环境净化治理成本、技术与工艺杂志》2007,17(2):71-96
This article discusses a framework and tools for evaluating ecological resources and the effects of cleanup on hazardous waste sites, particularly those with ecological buffer lands. Environmental professionals are faced with assessing the risks of contamination to humans and ecological receptors (organisms and ecosystems) at hazardous waste sites. While exposure assessment has focused largely on human receptors, environmental managers have recently taken a broader view, recognizing the intrinsic value and aesthetic importance of ecological resources and services, and of including a range of stakeholders in remediation decisions. The assessment process involves understanding exposure pathways from source to receptor, and determining how best to interdict these pathways. Environmental characterization and exposure assessment, indicator and biomarker identification, and biomonitoring and surveillance are the major components of ecological assessments. Using the Department of Energy as a case study, this article offers a framework for ecological exposure assessment, recognizing that humans are important components of ecosystems and, like other biota, are exposed to contaminants that move through environmental media. © 2007 Wiley Periodicals, Inc. 相似文献
57.
Energy-return-on-investment (ERI) analysis is a variation of more traditional cost-benefit analyses, a variation that is particularly important in times of diminishing fuel resources. We present a simple set of procedures for ERI analysis and apply those procedures to central New York State, where there is a proposal for a new 870 MWe coal-fired generating station. We compared the energy and dollar costs of building that facility with the costs of an alternative comprehensive regional program of insulation. The analysis showed that regional insulation was more efficient in conserving energy than the plant was in providing it by at least a factor of 4 in economic terms and by a factor of more than 15 when viewed as energy returned on energy invested. 相似文献
58.
Robert E. Markland L. Douglas Smith Jack D. Becker 《Journal of the American Water Resources Association》1976,12(3):577-600
ABSTRACT This paper describes the development and use of a mixed integer programming model for the planning of land disposal wastewater treatment facilities. Consideration is given to relevant construction and operating costs for land sites, transmission arteries, land acquisition costs, tangible benefits from land use, controls on aquifers, and various other engineering and technical constraints The model is used to determine which land disposal sites should serve which treatment plants, when initial construction should be initiated and completed, and when capacity expansion should occur. The model's application to the St. Louis Standard Metropolitan Statistical Area is illustrated and discussed. 相似文献
59.
Jolanta Liwkowicz Joanna Kowalska 《International journal of occupational safety and ergonomics》2013,19(1):81-88
Because they cause burns that are difficult to heal, acids are dangerous, and steps should be taken to ensure that the human skin does not come into contact with them. For this purpose safety gloves are generally used by workers who have to handle acids. Such gloves need to be tested to ensure that they are acid resistant. Standard EN 374 (European Committee for Standardization [CEN], 1993c) specifies a method of testing the permeation of liquid chemicals, on a molecular level, through glove material, but it may be difficult to ensure the fitness of the joints of a two-compartment cell, when gloves are lined with jersey. To deal with this a simple pH-meter method to test the permeation of acid and alkali solutions through safety gloves has been developed. The permeation of H2S04, HCI, HN03, and CH3COOH through gloves made from neoprene, nitrile, and PVC was tested. This method seems to be simple and economical. 相似文献
60.