全文获取类型
收费全文 | 2888篇 |
免费 | 236篇 |
国内免费 | 559篇 |
专业分类
安全科学 | 264篇 |
废物处理 | 21篇 |
环保管理 | 385篇 |
综合类 | 1818篇 |
基础理论 | 440篇 |
污染及防治 | 97篇 |
评价与监测 | 172篇 |
社会与环境 | 315篇 |
灾害及防治 | 171篇 |
出版年
2024年 | 9篇 |
2023年 | 64篇 |
2022年 | 107篇 |
2021年 | 136篇 |
2020年 | 108篇 |
2019年 | 99篇 |
2018年 | 91篇 |
2017年 | 104篇 |
2016年 | 142篇 |
2015年 | 132篇 |
2014年 | 139篇 |
2013年 | 167篇 |
2012年 | 237篇 |
2011年 | 248篇 |
2010年 | 173篇 |
2009年 | 174篇 |
2008年 | 160篇 |
2007年 | 211篇 |
2006年 | 155篇 |
2005年 | 140篇 |
2004年 | 127篇 |
2003年 | 113篇 |
2002年 | 98篇 |
2001年 | 82篇 |
2000年 | 95篇 |
1999年 | 66篇 |
1998年 | 56篇 |
1997年 | 42篇 |
1996年 | 41篇 |
1995年 | 46篇 |
1994年 | 24篇 |
1993年 | 25篇 |
1992年 | 16篇 |
1991年 | 12篇 |
1990年 | 10篇 |
1989年 | 2篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1975年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有3683条查询结果,搜索用时 109 毫秒
971.
Despite increasing attention to management of headwater streams as sources of water, sediment, and wood to downstream rivers,
the extent of headwater channels and perennial flow remain poorly known and inaccurately depicted on topographic maps and
in digital hydrographic data. This study reports field mapping of channel head and perennial flow initiation locations in
forested landscapes underlain by sandstone and basalt lithologies in Washington State, USA. Contributing source areas were
delineated for each feature using a digital elevation model (DEM) as well as a Global Positioning System device in the field.
Systematic source area–slope relationships described in other landscapes were not evident for channel heads in either lithology.
In addition, substantial variability in DEM-derived source area sizes relative to field-delineated source areas indicates
that in this area, identification of an area–slope relationship, should one even exist, would be difficult. However, channel
heads and stream heads, here defined as the start of perennial flow, appear to be co-located within both of the lithologies,
which together with lateral expansion and contraction of surface water around channel heads on a seasonal cycle in the basalt
lithology, suggest a controlling influence of bedrock springs for that location. While management strategies for determining
locations of channel heads and perennial flow initiation in comparable areas could assign standard source area sizes based
on limited field data collection within that landscape, field-mapped source areas that support perennial flow are much smaller
than recognized by current Washington State regulations. 相似文献
972.
To investigate how the perceptions and behaviour of visitors to coral reefs are influenced by their prior experience and knowledge
of marine life, a questionnaire-based study was undertaken at sites in the Ras Mohammed National Park and at Sharm El Sheikh,
South Sinai, Egypt. It was evident that over the 10–20 years during which these reefs have deteriorated (mainly due to reef-flat
trampling), there have been interrelated shifts in the nature of visitors making use of them. First, there has been a shift
from experienced divers and snorkellers to inexperienced snorkellers and non-snorkellers with a poorer knowledge of reef biology.
Second, there has been a shift in the predominant nationalities of visitors, from German and British, through Italian, to
Russian. More recent user groups both stated and showed that they had less experience of snorkelling; they also showed less
knowledge of marine life and less interest in learning about it. Visitor perceptions of both the state of the marine life
on the reefs and the acceptability of current visitor numbers also varied between groups. More recent visitor groups and visitors
with less knowledge were more satisfied with reef health. In general, however, visitor perceptions of reef health did not
correlate well with actual reef conditions, probably because more experienced visitors preferred less impacted sites with
which they were nevertheless less satisfied than inexperienced visitors at heavily impacted sites. More recent visitor groups
were also less bothered by crowding on the shore or in the water. Consequently, the apparent “social carrying capacity” of
sites seems to be increasing to a level well above the likely “ecological carrying capacity”. 相似文献
973.
Introduction Landfill is still the m ost com m on w ay to treat m ore and m ore m unicipal solid w aste (M SW ) in all over the w orld, especially in C hina (Feng and C hen, 2000). H ow ever, the leachate produced from landfill is very com plicated and va… 相似文献
974.
975.
Cities are developing innovative strategies to combat climate change but there remains little knowledge of the winners and losers from climate-adaptive land use planning and design. We examine the distribution of health benefits associated with land use policies designed to increase vegetation and surface reflectivity in three US metropolitan areas: Atlanta, GA, Philadelphia, PA, and Phoenix, AZ. Projections of population and land cover at the census tract scale were combined with climate models for the year 2050 at 4 km × 4 km resolution to produce future summer temperatures which were input into a comparative risk assessment framework for the temperature-mortality relationship. The findings suggest disparities in the effectiveness of urban heat management strategies by age, income, and race. We conclude that, to be most protective of human health, urban heat management must prioritize areas of greatest population vulnerability. 相似文献
976.
Ecosystems are essential in providing multiple services to society. However, understanding ecosystem services (ESS) in terms of spatial distribution and trade-offs still remains a challenge for landscape planners and natural resource managers. In this paper, we analyzed the supply of a set of ESS – carbon storage, soil erosion protection, biodiversity, and recreation – within the landscape surrounding the city of Bari in Southern Italy. Through an analysis of this landscape, which includes natural protected areas, such as Natura 2000 Network sites, national and regional parks and nature reserves, and in view of the recent Fitness Check of the Nature Directives, we aimed to provide answers to the following questions: (i) Where are the areas of high and low supply of individual ecosystem services located?; (ii) Where do ecosystem service trade-offs (i.e., ‘hotspots’ and ‘coldspots’) occur?; and (iii) To what extent are ecosystem service hotspots and coldspots located within or outside of natural protected areas? Results show that most of the landscape in the study area supplied at least one of the selected ESS and that ESS hotspots were mostly located within forested and/or natural areas. Hotspots occupied 8.0% of the total landscape, with 23.7% located in natural protected areas. Coldspots were scarce and equal to 2.4%; they constituted only 0.1% of natural protected areas. Almost all of the landscape (89.6%) consists of intermediate areas (i.e., between hotspots and coldspots); 76.2% of natural protected areas consists of intermediate areas. This latter finding is relevant because the high intermediate classes are potentially high-performing areas, which lie mainly on the borders of protected spaces; they can positively influence ecological processes and thus enhance a wide-ranging provision of ESS. Our results highlight the importance of analyzing landscapes to facilitate the selection of priority areas where management efforts would yield maximum benefits. 相似文献
977.
基于多米诺效应的油品储罐区个人风险研究 总被引:1,自引:1,他引:0
介绍了多米诺效应的基本原理和多米诺事故发生的概率分析方法。提出在一定条件下进行储罐区风险评价时,多米诺效应对个人风险值的影响不容忽视,并给出了考虑多米诺效应的个人风险计算方法。最后利用开发的个人风险计算软件通过分析计算,给出了某储罐区的个人风险等值线分布图。结果表明,该罐区正北方向相邻的一劳动密集型工厂需搬迁,或采取相应安全保护措施降低风险。该方法考虑了多米诺效应对装置事故发生概率的影响,能提高个人风险计算结果的真实性与准确性。 相似文献
978.
采用臭氧氧化法对某厂染料废水生化出水进行深度处理,考察了废水初始pH值和臭氧气泡大小对废水处理效果的影响,研究了臭氧微气泡对气液传质的影响。结果表明,在pH 2.5~11范围内,废水初始pH值越大,处理效果越好;加载微孔膜片后,臭氧气泡粒径变小,增大了臭氧的传质比表面积,延长了臭氧气泡在反应柱内的停留时间,强化了传质效果,处理废水的臭氧利用率可增大10%~30%,强化了臭氧氧化作用。加载5 μm孔径的膜片相比无膜片的情况,COD去除率提高了近30%,TOC去除率提高了16%。 相似文献
979.
Leila T. Hatch Christopher W. Clark Sofie M. Van Parijs Adam S. Frankel Dimitri W. Ponirakis 《Conservation biology》2012,26(6):983-994
The effects of chronic exposure to increasing levels of human‐induced underwater noise on marine animal populations reliant on sound for communication are poorly understood. We sought to further develop methods of quantifying the effects of communication masking associated with human‐induced sound on contact‐calling North Atlantic right whales (Eubalaena glacialis) in an ecologically relevant area (~10,000 km2) and time period (peak feeding time). We used an array of temporary, bottom‐mounted, autonomous acoustic recorders in the Stellwagen Bank National Marine Sanctuary to monitor ambient noise levels, measure levels of sound associated with vessels, and detect and locate calling whales. We related wind speed, as recorded by regional oceanographic buoys, to ambient noise levels. We used vessel‐tracking data from the Automatic Identification System to quantify acoustic signatures of large commercial vessels. On the basis of these integrated sound fields, median signal excess (the difference between the signal‐to‐noise ratio and the assumed recognition differential) for contact‐calling right whales was negative (?1 dB) under current ambient noise levels and was further reduced (?2 dB) by the addition of noise from ships. Compared with potential communication space available under historically lower noise conditions, calling right whales may have lost, on average, 63–67% of their communication space. One or more of the 89 calling whales in the study area was exposed to noise levels ≥120 dB re 1 μPa by ships for 20% of the month, and a maximum of 11 whales were exposed to noise at or above this level during a single 10‐min period. These results highlight the limitations of exposure‐threshold (i.e., dose‐response) metrics for assessing chronic anthropogenic noise effects on communication opportunities. Our methods can be used to integrate chronic and wide‐ranging noise effects in emerging ocean‐planning forums that seek to improve management of cumulative effects of noise on marine species and their habitats. Cuantificación de la Pérdida de Espacio de Comunicación Acústica para Ballenas Francas Dentro y Alrededor de un Santuario Marino Nacional en E. U. A. 相似文献
980.