全文获取类型
收费全文 | 987篇 |
免费 | 20篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 45篇 |
废物处理 | 45篇 |
环保管理 | 253篇 |
综合类 | 85篇 |
基础理论 | 254篇 |
污染及防治 | 225篇 |
评价与监测 | 65篇 |
社会与环境 | 33篇 |
灾害及防治 | 14篇 |
出版年
2023年 | 4篇 |
2022年 | 14篇 |
2021年 | 12篇 |
2020年 | 11篇 |
2019年 | 11篇 |
2018年 | 21篇 |
2017年 | 19篇 |
2016年 | 30篇 |
2015年 | 25篇 |
2014年 | 35篇 |
2013年 | 106篇 |
2012年 | 35篇 |
2011年 | 56篇 |
2010年 | 39篇 |
2009年 | 36篇 |
2008年 | 53篇 |
2007年 | 47篇 |
2006年 | 44篇 |
2005年 | 30篇 |
2004年 | 26篇 |
2003年 | 36篇 |
2002年 | 33篇 |
2001年 | 16篇 |
2000年 | 20篇 |
1999年 | 20篇 |
1998年 | 5篇 |
1997年 | 17篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 15篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 6篇 |
1987年 | 10篇 |
1986年 | 8篇 |
1985年 | 13篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 15篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 3篇 |
排序方式: 共有1019条查询结果,搜索用时 15 毫秒
851.
L.-J. Sally Liu Harish C. Phuleria Whitney Webber Mark Davey Douglas R. Lawson Robert G. Ireson Barbara Zielinska John M. Ondov Christopher S. Weaver Charles A. Lapin Michael Easter Thomas W. Hesterberg Timothy Larson 《Atmospheric environment (Oxford, England : 1994)》2010,44(28):3422-3431
We monitored two Seattle school buses to quantify the buses’ self pollution using the dual tracers (DT), lead vehicle (LV), and chemical mass balance (CMB) methods. Each bus drove along a residential route simulating stops, with windows closed or open. Particulate matter (PM) and its constituents were monitored in the bus and from a LV. We collected source samples from the tailpipe and crankcase emissions using an on-board dilution tunnel. Concentrations of PM1, ultrafine particle counts, elemental and organic carbon (EC/OC) were higher on the bus than the LV. The DT method estimated that the tailpipe and the crankcase emissions contributed 1.1 and 6.8 μg m?3 of PM2.5 inside the bus, respectively, with significantly higher crankcase self pollution (SP) when windows were closed. Approximately two-thirds of in-cabin PM2.5 originated from background sources. Using the LV approach, SP estimates from the EC and the active personal DataRAM (pDR) measurements correlated well with the DT estimates for tailpipe and crankcase emissions, respectively, although both measurements need further calibration for accurate quantification. CMB results overestimated SP from the DT method but confirmed crankcase emissions as the major SP source. We confirmed buses’ SP using three independent methods and quantified crankcase emissions as the dominant contributor. 相似文献
852.
The International Joint Commission has recently completed a five-year study (2000–2005) to review the operation of structures controlling the flows and levels of the Lake Ontario – St. Lawrence River system. In addition to addressing the multitude of stakeholder interests, the regulation plan review also considers environmental sustainability and integrity of wetlands and various ecosystem components. The present paper outlines the general approach, scientific methodology and applied management considerations of studies quantifying the relationships between hydrology and wetland plant assemblages (% occurrence, surface area) in Lake Ontario and the Upper and Lower St. Lawrence River. Although similar study designs were used across the study region, different methodologies were required that were specifically adapted to suit the important regional differences between the lake and river systems, range in water-level variations, and confounding factors (geomorphic types, exposure, sediment characteristics, downstream gradient of water quality, origin of water masses in the Lower River). Performance indicators (metrics), such as total area of wetland in meadow marsh vegetation type, that link wetland response to water levels will be used to assess the effects of different regulation plans under current and future (climate change) water-supply scenarios.The Canadian Crown reserves the right to retain a non-exclusive, royalty free licence in and to any copyright. 相似文献
853.
Geraint A. Tarling Jennifer J. Freer Neil S. Banas Anna Belcher Mayleen Blackwell Claudia Castellani Kathryn B. Cook Finlo R. Cottier Malin Daase Magnus L. Johnson Kim S. Last Penelope K. Lindeque Daniel J. Mayor Elaine Mitchell Helen E. Parry Douglas C. Speirs Gabriele Stowasser Marianne Wootton 《Ambio》2022,51(2):333
The changing Arctic environment is affecting zooplankton that support its abundant wildlife. We examined how these changes are influencing a key zooplankton species, Calanus finmarchicus, principally found in the North Atlantic but expatriated to the Arctic. Close to the ice-edge in the Fram Strait, we identified areas that, since the 1980s, are increasingly favourable to C. finmarchicus. Field-sampling revealed part of the population there to be capable of amassing enough reserves to overwinter. Early developmental stages were also present in early summer, suggesting successful local recruitment. This extension to suitable C. finmarchicus habitat is most likely facilitated by the long-term retreat of the ice-edge, allowing phytoplankton to bloom earlier and for longer and through higher temperatures increasing copepod developmental rates. The increased capacity for this species to complete its life-cycle and prosper in the Fram Strait can change community structure, with large consequences to regional food-webs.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01667-y. 相似文献
854.
Michael R. Heath Dborah Benkort Andrew S. Brierley Ute Daewel Jack H. Laverick Roland Proud Douglas C. Speirs 《Ambio》2022,51(2):456
Projecting the consequences of warming and sea-ice loss for Arctic marine food web and fisheries is challenging due to the intricate relationships between biology and ice. We used StrathE2EPolar, an end-to-end (microbes-to-megafauna) food web model incorporating ice-dependencies to simulate climate-fisheries interactions in the Barents Sea. The model was driven by output from the NEMO-MEDUSA earth system model, assuming RCP 8.5 atmospheric forcing. The Barents Sea was projected to be > 95% ice-free all year-round by the 2040s compared to > 50% in the 2010s, and approximately 2 °C warmer. Fisheries management reference points (FMSY and BMSY) for demersal fish (cod, haddock) were projected to increase by around 6%, indicating higher productivity. However, planktivorous fish (capelin, herring) reference points were projected to decrease by 15%, and upper trophic levels (birds, mammals) were strongly sensitive to planktivorous fish harvesting. The results indicate difficult trade-offs ahead, between harvesting and conservation of ecosystem structure and function.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01616-9. 相似文献
855.
de Oliveira Maria Rayane Correia de Lima Silva Maria Gabriely Alcântara Isabel Sousa Filho Jaime Ribeiro Tintino Cícera Datiane de Morais Oliveira Magalhães Francisco Ernani Alves Martins Anita Oliveira Brito Pereira Bezerra Pessoa Renata Torres Duarte Antonia Eliene da Costa José Galberto Martins de Lima Sidney Gonçalo Coutinho Henrique Douglas Melo Capasso Raffaele de Menezes Irwin Rose Alencar 《Environment, Development and Sustainability》2021,23(10):14958-14981
Environment, Development and Sustainability - This work aimed to analyze the chemical composition and evaluate the anti-inflammatory and antinociceptive properties of the essential oil obtained... 相似文献
856.
857.
Robert A. Swett Charles Listowski Douglas Fry Stephen Boutelle David Fann 《Environmental management》2009,43(6):962-971
Florida’s coasts have been transformed over the past three decades as population growth and unprecedented demand for individual
shore access to bays and estuaries led to the creation of residential canal developments. Thousands of miles of channels and
basins were dredged as a by-product of this urbanization process. The navigable waterways that resulted are now being stressed
by increasing boat traffic and canal-side activities. Recognizing their common goal to preserve the recreational and ecological
value of southwest Florida waterways, the Florida Department of Environmental Protection, the four-county West Coast Inland
Navigation District, and the University of Florida Sea Grant College Program signed a Memorandum of Agreement. The signatories
agreed to develop a science-based Regional Waterway Management System (RWMS), which is a new approach to waterway planning
and permitting based on carefully mapped channel depths, a census of actual boat populations, and the spatial extent of natural
resources. The RWMS provides a comprehensive, regional overview of channel conditions and the geographic distribution and
severity of existing impediments to safe navigation and resource protection. RWMS information and analyses result in regional-scale
permitting to accommodate water-dependent uses while minimizing environmental impacts and reducing public expenditures. Compared
with traditional approaches to waterway management, the science-based RWMS is relatively unbiased, objective, transparent,
ecologically sound, and fiscally prudent. 相似文献
858.
Humans sometimes forage or distribute the products of foraging in ways that do not maximize individual energetic return rates. As an alternative to hypotheses that rely on reciprocal altruism to counter the costs of inefficiency, we suggest that the cost itself could be recouped through signal benefit. Costly signaling theory predicts that signals can provide fitness benefits when costs are honestly linked to signaler quality, and this information is broadcast to potential mates and competitors. Here, we test some predictions of costly signaling theory against empirical data on human food acquisition and sharing patterns. We show that at least two types of marine foraging, turtle hunting and spearfishing, as practiced among the Meriam (a Melanesian people of Torres Strait, Australia) meet key criteria for costly signaling: signal traits are (1) differentially costly or beneficial in ways that are (2) honestly linked to signaler quality, and (3) designed to effectively broadcast the signal. We conclude that relatively inefficient hunting or sharing choices may be maintained in a population if they serve as costly and reliable signals designed to reveal the signaler's qualities to observers. 相似文献
859.
Monitoring of ambient air PCDD/F levels in Portugal 总被引:3,自引:0,他引:3
As part of a monitoring program conducted by IDAD--Institute for Environment and Development and supported by regional municipal solid waste (MSW) management authorities, dioxin concentrations in ambient air were measured in three regions of Portugal: Porto, Lisbon and Madeira. These independent studies were performed with the intention of providing data as a basis for the evaluation of potential impacts of the operation of recently built MSW incinerators. Thus, 170 samples were collected in nine different sites from January 1999 till present. The measured levels revealed an extremely variable content of PCDDs/PCDFs depending both on the area and the season of the year. Samples taken in Porto and Lisbon reveal a similar homologue structure even if concentrations measured in the Porto region are significantly greater. Data from Madeira is characteristic of a remote site with some of the congeners concentrations below the detection limit. 相似文献
860.
Cadle SH Ayala A Black KN Fulper CR Graze RR Minassian F Murray HB Natarajan M Tennant CJ Lawson DR;Coordinating Research Council 《Journal of the Air & Waste Management Association (1995)》2007,57(2):139-145
The Coordinating Research Council held its 16th workshop in March 2006, with 83 presentations describing the most recent mobile source-related emissions research. In this paper, we summarize the presentations from researchers who are engaged in improving our understanding of the contribution of mobile sources to air quality. Participants in the workshop discussed evaluation of in-use emissions control programs, effects of fuels on emissions, emission models and emission inventories, results from gas- and particle-phase emissions studies from spark-ignition and diesel-powered vehicles, and efforts to improve our capabilities in performing on-board emissions measurements, as well as topics for future research. 相似文献