全文获取类型
收费全文 | 517篇 |
免费 | 5篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 28篇 |
废物处理 | 13篇 |
环保管理 | 103篇 |
综合类 | 85篇 |
基础理论 | 119篇 |
污染及防治 | 108篇 |
评价与监测 | 55篇 |
社会与环境 | 19篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 21篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 45篇 |
2012年 | 40篇 |
2011年 | 37篇 |
2010年 | 13篇 |
2009年 | 25篇 |
2008年 | 35篇 |
2007年 | 22篇 |
2006年 | 33篇 |
2005年 | 21篇 |
2004年 | 21篇 |
2003年 | 22篇 |
2002年 | 16篇 |
2001年 | 1篇 |
2000年 | 8篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 5篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 6篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1978年 | 2篇 |
1977年 | 2篇 |
排序方式: 共有532条查询结果,搜索用时 453 毫秒
41.
Patricia M. Dooris Dean F. Martin 《Journal of the American Water Resources Association》1978,14(5):1088-1093
ABSTRACT: Iron, added as (Fe-EDTA)-, was found stimulatory to V. spiralis at a concentration of 0.05 ppm. (Fe-EDTA)- had no effect upon growth of V. neotropicalis as measured by changes in dissolved oxygen and dry weight. Results are compared with those derived from similar studies with Hydrilla verticillata and Egeria densa. The implications of lake drawdown and aeration are discussed. 相似文献
42.
Patricia M. Dooris Vance Ley Dean F. Martin 《Journal of the American Water Resources Association》1982,18(4):599-604
ABSTRACT: The choice of a lake rehabilitation technique can be assisted by laboratory experiments concerned with the composition and properties of the sediments. This work on Sawgrass Lake, Pinellas County, Florida, provides an example of the type of laboratory information that can be useful towards making decisions regarding the most effective restorative techniques. Experiments include chemical analysis of sediment (water content, organic content, pesticides, nutrients), rate of sediment compaction and rehydration at ambient conditions, and the effect of treatment with alum and other chemicals. 相似文献
43.
44.
45.
46.
Robin Hickman Patricia Austin David Banister 《Journal of Environmental Policy & Planning》2014,16(3):419-435
AbstractA number of cities around the world are associated with very high levels of private motor car usage, and Auckland provides an example of one of these ‘hyperautomobile’ cities. There are many problems with this system of transportation and dependence on the private car, including environmental, social and city design dimensions. Though there is a clear aspiration to move towards reduced levels of car usage in the city's transport and spatial planning strategies, there are major difficulties in implementation terms. We develop and consider future scenarios to 2041 to reduce these levels of motorization, and subsequent transport CO2 emissions, with a much greater use of public transport, walking and cycling, urban planning, and low emission vehicles. The current implementability of such a ‘sustainable mobility’ future is however questioned in the current political and social context, and critically debated in terms of the available governance mechanisms and the limited attempts to shape the behaviour of the public. We conclude by calling for a reconsideration of the policy measures being considered, including the range and levels of application and investment; with a much wider framing of the transport planning remit, and carried out within a much stronger participatory framework for decision-making. 相似文献
47.
Adriana Melo Jousilene de Sales Tavares Marianny de Assis Costa Renato Santana de Aguiar Gustavo Malinger Fabiana de Oliveira Melo Mariana Balbino da-Silva Bruno Luiz Fonseca Schamber-Reis Gabriela Gama Amilcar Tanuri Leila Chimelli Patricia Oliveira-Szejnfeld Melania M. Ramos de Amorim 《黑龙江环境通报》2020,40(13):1732-1740
48.
Extracts of 19 of 24 species of sponge collected from Queensland. Australia, inhibited the growth of test microorganisms in in-vitro assays. A similar result has been obtained by earlier workers for extracts of species of sponge obtained from temperate waters. Some of the extracts, including extracts of Thorecta vasiforis, Arenochalina mirabilis and Acanthella kleutha, showed activity against bacterial strains that was comparable with that exhibited by penicillin G and streptomycin against these strains. Gram-positive bacteria were expecially sensitive to many extracts. Little activity was exhibited by any extract against four species of fungi tested. Some of the extracts were markedly toxic to one or more of the test organisms (a fish, a crustacean and a hydroid) used, but no clear pattern linking toxicity to these organisms with antimicrobial properties of the extracts emerged. In general, there bas a negative correlation between antimicrobial activity and surface-fouling, raising the possibility of using freedom from surface-fouling as an indicator of antimicrobial activity. Four of five encrusting species from the undersides of coral boulders showed antimicrobial activity. This study confirmed the value of using methanol-toluene extracts in field-based screening programmes, but emphasised the need to use additional extracting media such as methylene chloride in order to augment the number of antimicrobial compounds detected. There are indications that antimicrobial activity may be widespread in the order Dictyoceratida, in the order Verongida and in the order Axinellida, but sporadic in other orders of Porifera. 相似文献
49.
Patricia Barnett 《生态毒理学报》2002,(4):18-19
旅游业关注组织 ( Tourism Concern) 意识到在必然的旅游程序中 , 存在着一连串错误的解释 , 它们都在暗示自己才是旅游开发所产生问题的解决方案 . 就我们所见 , 它们被冠以的名目 有 : “ 责任心之旅 “ 、 “ 绿色之旅 “ 、 “ 亲近贫困之旅 “ 、 “ 民俗特色之旅 “ 、 “ 社区之旅 “ 、 “ 生态之旅 “ 等等 , 不一而足 . 它们把我们的视线从关注真正的需求 , 切换到旅游结构 与发展中基本原则的改变 .
…… 相似文献
50.
Patricia Cortijo 《生态毒理学报》2004,(3):28
ACCor是欧洲最大的旅行、旅游和团体服务集团.它有150000名员工,分布在140个国家.将近有4000个Accor旅馆(443000个房间)分布在90个国家.…… 相似文献