全文获取类型
收费全文 | 20520篇 |
免费 | 325篇 |
国内免费 | 411篇 |
专业分类
安全科学 | 797篇 |
废物处理 | 835篇 |
环保管理 | 3410篇 |
综合类 | 3253篇 |
基础理论 | 5200篇 |
环境理论 | 14篇 |
污染及防治 | 5282篇 |
评价与监测 | 1182篇 |
社会与环境 | 1130篇 |
灾害及防治 | 153篇 |
出版年
2023年 | 109篇 |
2022年 | 193篇 |
2021年 | 193篇 |
2020年 | 212篇 |
2019年 | 183篇 |
2018年 | 321篇 |
2017年 | 324篇 |
2016年 | 483篇 |
2015年 | 386篇 |
2014年 | 510篇 |
2013年 | 1784篇 |
2012年 | 734篇 |
2011年 | 1035篇 |
2010年 | 770篇 |
2009年 | 872篇 |
2008年 | 965篇 |
2007年 | 1024篇 |
2006年 | 838篇 |
2005年 | 707篇 |
2004年 | 727篇 |
2003年 | 671篇 |
2002年 | 631篇 |
2001年 | 697篇 |
2000年 | 578篇 |
1999年 | 356篇 |
1998年 | 257篇 |
1997年 | 267篇 |
1996年 | 272篇 |
1995年 | 313篇 |
1994年 | 265篇 |
1993年 | 255篇 |
1992年 | 213篇 |
1991年 | 217篇 |
1990年 | 212篇 |
1989年 | 207篇 |
1988年 | 188篇 |
1987年 | 162篇 |
1986年 | 183篇 |
1985年 | 169篇 |
1984年 | 214篇 |
1983年 | 180篇 |
1982年 | 214篇 |
1981年 | 192篇 |
1980年 | 153篇 |
1979年 | 173篇 |
1978年 | 118篇 |
1977年 | 123篇 |
1975年 | 96篇 |
1974年 | 100篇 |
1972年 | 104篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
202.
203.
F.L. Voelz S.I. Weinberg B.G. Gower 《Journal of the Air & Waste Management Association (1995)》2013,63(12):935-942
Gross average automotive exhaust emissions data collected by the Atlantic Richfield Clean Air Caravan during the summer of 1970 showed only slight geographical variations when the specific makes were ignored. When considering specific makes, significant differences were found on an average emissions basis. Vehicle population—emission distributions showed wide variations in the 50% population levels and in the percent of vehicles with emissions greater than specified values. Hydrocarbon (HC) and carbon monoxide (CO) data are given on a gross basis for the 1970, 1968-69, 1966-67, and pre-1966 model year group vehicles. Average HC and CO emissions and vehicle population-Idle emissions distribution curves are included for specific make vehicles in selected areas. 相似文献
204.
D.P. Hoult S.R. O'Dea G.L. Touchton R.J. Ketterer 《Journal of the Air & Waste Management Association (1995)》2013,63(1):56-60
Plume rise downwind of a large stationary gas turbine was measured in the field and the conditions were then scaled in the laboratory. For the laboratory, the plume exit conditions, wind velocity and temperature profiles, and wind direction were matched. It was found that for high temperature exhaust, the buoyancy is best matched by calculating a dimensionless density difference. With properly calculated buoyancy length scales, the plume trajectories were compared and were found to agree quite well. The probability distributions of the entrainment constant and the average values of the entrapment constant with downwind distance were compared. The field data showed about 15% greater plume rise. The median entrainment constant was about 10% greater for the lab test and the shape of the probability distribution matched very closely. 相似文献
205.
While the United States is the largest single market for air pollution control equipment, it constitutes only about one-third of the total world market. This overview explores the legislative, economic, and technological factors that affect those markets. 相似文献
206.
207.
Urgent transformation is required in Ireland to divert biodegradable municipal waste (BMW) from landfill and prevent increases in overall waste generation. When BMW is optimally managed, it becomes a resource with value instead of an unwanted by-product requiring disposal. An analysis of survey responses from commercial and residential sectors for the Dublin region in previous research by the authors proved that attitudes towards and behaviour regarding municipal solid waste is spatially variable. This finding indicates that targeted intervention strategies designed for specific geographic areas should lead to improved diversion rates of BMW from landfill, a requirement of the Landfill Directive 1999/31/EC. In the research described in this paper, survey responses and GIS model predictions from previous research were the basis for goal setting, after which logic modelling and behavioural research were employed to develop site-specific waste management intervention strategies. The main strategies devised include (a) roll out of the Brown Bin (Organics) Collection and Community Workshops in Dún Laoghaire Rathdown, (b) initiation of a Community Composting Project in Dublin City (c) implementation of a Waste Promotion and Motivation Scheme in South Dublin (d) development and distribution of a Waste Booklet to promote waste reduction activities in Fingal (e) region wide distribution of a Waste Booklet to the commercial sector and (f) Greening Irish Pubs Initiative. Each of these strategies was devised after interviews with both the residential and commercial sectors to help make optimal waste management the norm for both sectors. Strategy (b), (e) and (f) are detailed in this paper. By integrating a human element into accepted waste management approaches, these strategies will make optimal waste behaviour easier to achieve. Ultimately this will help divert waste from landfill and improve waste management practice as a whole for the region. This method of devising targeted intervention strategies can be adapted for many other regions. 相似文献
208.
209.
D. González-Zeas S. Quiroga A. Iglesias L. Garrote 《Regional Environmental Change》2014,14(5):1983-1993
The effects of climate change on agriculture are often characterised by changes in the average productivity of crops; however, these indicators provide limited information regarding the risks associated with fluctuations in productivity resulting from future changes in climate variability that may also affect agriculture. In this context, this study evaluates the combined effects of the risks associated with anomalies reflected by changes in the mean crop yield and the variability of productivity in European agro-climatic regions under future climate change scenarios. The objective of this study is to evaluate adaptation needs and to identify regional effects that should be addressed with greater urgency in the light of the risks and opportunities that are identified. The results show differential effects on regional agriculture and highlight the importance of considering both regional average impacts and the variability in crop productivity in setting priorities for the adaptation and maintenance of rural incomes and agricultural insurance programmes. 相似文献
210.
N. Dolgener L. Freudenberger N. Schneeweiss P. L. Ibisch R. Tiedemann 《Regional Environmental Change》2014,14(3):1063-1072
Environmental change is likely to have a strong impact on biodiversity, and many species may shift their distribution in response. In this study, we aimed at projecting the availability of suitable habitat for an endangered amphibian species, the Fire-bellied toad Bombina bombina, in Brandenburg (north-eastern Germany). We modelled a potential habitat distribution map based on (1) a database with 10,581 presence records for Bombina from the years 1990 to 2009, (2) current estimates for ecogeographical variables (EGVs) and (3) the future projection of these EGVs according to the statistical regional model, respectively, the soil and water integrated model, applying the maximum entropy approach (Maxent). By comparing current and potential future distributions, we evaluated the projected change in distribution of suitable habitats and identified the environmental variables most associated with habitat suitability that turned out to be climatic variables related to the hydrological cycle. Under the applied scenario, our results indicate increasing habitat suitability in many areas and an extended range of suitable habitats. However, even if the environmental conditions in Brandenburg may change as predicted, it is questionable whether the Fire-bellied toad will truly benefit, as dispersal abilities of amphibian species are limited and strongly influenced by anthropogenic disturbances, that is, intensive agriculture, habitat destruction and fragmentation. Furthermore, agronomic pressure is likely to increase on productive areas with fertile soils and high water retention capacities, indeed those areas suitable for B. bombina. All these changes may affect temporary pond hydrology as well as the reproductive success and breeding phenology of toads. 相似文献