全文获取类型
收费全文 | 3776篇 |
免费 | 85篇 |
国内免费 | 37篇 |
专业分类
安全科学 | 183篇 |
废物处理 | 138篇 |
环保管理 | 942篇 |
综合类 | 364篇 |
基础理论 | 945篇 |
环境理论 | 3篇 |
污染及防治 | 914篇 |
评价与监测 | 237篇 |
社会与环境 | 148篇 |
灾害及防治 | 24篇 |
出版年
2023年 | 43篇 |
2022年 | 53篇 |
2021年 | 42篇 |
2020年 | 44篇 |
2019年 | 65篇 |
2018年 | 77篇 |
2017年 | 87篇 |
2016年 | 132篇 |
2015年 | 83篇 |
2014年 | 107篇 |
2013年 | 376篇 |
2012年 | 139篇 |
2011年 | 238篇 |
2010年 | 173篇 |
2009年 | 175篇 |
2008年 | 185篇 |
2007年 | 201篇 |
2006年 | 183篇 |
2005年 | 109篇 |
2004年 | 138篇 |
2003年 | 135篇 |
2002年 | 122篇 |
2001年 | 75篇 |
2000年 | 48篇 |
1999年 | 47篇 |
1998年 | 50篇 |
1997年 | 52篇 |
1996年 | 59篇 |
1995年 | 58篇 |
1994年 | 48篇 |
1993年 | 45篇 |
1992年 | 29篇 |
1991年 | 31篇 |
1990年 | 40篇 |
1989年 | 25篇 |
1988年 | 38篇 |
1987年 | 28篇 |
1986年 | 41篇 |
1985年 | 23篇 |
1984年 | 38篇 |
1983年 | 32篇 |
1982年 | 34篇 |
1981年 | 32篇 |
1980年 | 21篇 |
1979年 | 20篇 |
1978年 | 12篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1974年 | 8篇 |
1972年 | 9篇 |
排序方式: 共有3898条查询结果,搜索用时 765 毫秒
501.
Garnaga G Wyse E Azemard S Stankevicius A de Mora S 《Environmental pollution (Barking, Essex : 1987)》2006,144(3):855-861
Arsenic occurs as a persistent constituent in many of the chemical weapons dumped into the Baltic Sea; it can be used as an indicator of leakage and dispersal of released munitions to the marine environment. Total arsenic was analysed in sediment samples taken from the Lithuanian economic zone in the Baltic Sea, which included samples from the chemical munitions dumpsite in the Gotland Basin and national monitoring stations in the southeastern Baltic Sea. Arsenic concentrations in sediments ranged from 1.1 to 19.0 mg kg(-1), with an average of 3.4 mg kg(-1). Although there was evidence of slightly elevated arsenic content in sediments near the weapons dumpsite, arsenic concentrations were nevertheless quite low relative to other investigations in the Baltic and North Seas. 相似文献
502.
Schwab JJ Felton HD Rattigan OV Demerjian KL 《Journal of the Air & Waste Management Association (1995)》2006,56(4):372-383
Field evaluations and comparisons of continuous fine particulate matter (PM2,5) mass measurement technologies at an urban and a rural site in New York state are performed. The continuous measurement technologies include the filter dynamics measurement system (FDMS) tapered element oscillating microbalance (TEOM) monitor, the stand-alone TEOM monitor (without the FDMS), and the beta attenuation monitor (BAM). These continuous measurement methods are also compared with 24-hr integrated filters collected and analyzed under the Federal Reference Method (FRM) protocol. The measurement sites are New York City (the borough of Queens) and Addison, a rural area of southwestern New York state. New York City data comparisons between the FDMS TEOM, BAM, and FRM are examined for bias and seasonality during a 2-yr period. Data comparisons for the FDMS TEOM and FRM from the Addison location are examined for the same 2-yr period. The BAM and FDMS measurements at Queens are highly correlated with each other and the FRM. The BAM and FDMS are very similar to each other in magnitude, and both are approximately 25% higher than the FRM filter measurements at this site. The FDMS at Addison measures approximately 9% more mass than the FRM. Mass reconstructions using the speciation trends network filter data are examined to provide insight as to the contribution of volatile species of PM2.5 in the FDMS mass measurement and the fraction that is likely lost in the FRM mass measurement. The reconstructed mass at Queens is systematically lower than the FDMS by approximately 10%. 相似文献
503.
504.
Morin-Crini Nadia Loiacono Sonia Placet Vincent Torri Giangiacomo Bradu Corina Kostić Mirjana Cosentino Cesare Chanet Gilles Martel Bernard Lichtfouse Eric Crini Grégorio 《Environmental Chemistry Letters》2019,17(1):393-408
Environmental Chemistry Letters - With the increasing focus on renewable materials and sustainability issues, the development of non-conventional materials from natural resources and possessing... 相似文献
505.
Kumar P. Senthil Suganya S. Srinivas S. Priyadharshini S. Karthika M. Karishma Sri R. Swetha V. Naushad Mu. Lichtfouse Eric 《Environmental Chemistry Letters》2019,17(4):1707-1726
Environmental Chemistry Letters - Delivering the right amount of fluoride to drinking water protects the teeth from decay and reduces the risk of cavities. Nonetheless, fluorosis has been... 相似文献
506.
Environmental Fluid Mechanics - The flow conditions in and around a suspended canopy, resembling those formed by aquaculture structures such as rafts cages and longlines, were modeled using an... 相似文献
507.
Caitlin D. Kuempel Kendall R. Jones James E.M. Watson Hugh P. Possingham 《Conservation biology》2019,33(6):1350-1359
Marine protected areas (MPAs) are a critical defense against biodiversity loss in the world's oceans, but to realize near-term conservation benefits, they must be established where major threats to biodiversity occur and can be mitigated. We quantified the degree to which MPA establishment has targeted stoppable threats (i.e., threats that can be abated through effectively managed MPAs alone) by combining spatially explicit marine biodiversity threat data in 2008 and 2013 and information on the location and potential of MPAs to halt threats. We calculated an impact metric to determine whether countries are protecting proportionally more high- or low-threat ecoregions and compared observed values with random protected-area allocation. We found that protection covered <2% of ecoregions in national waters with high levels of abatable threat in 2013, which is ∼59% less protection in high-threat areas than if MPAs had been placed randomly. Relatively low-threat ecoregions had 6.3 times more strict protection (International Union for Conservation of Nature categories I–II) than high-threat ecoregions. Thirty-one ecoregions had high levels of stoppable threat but very low protection, which presents opportunities for MPAs to yield more significant near-term conservation benefits. The extent of the global MPA estate has increased, but the establishment of MPAs where they can reduce threats that are driving biodiversity loss is now urgently needed. 相似文献
508.
509.
Environmental Chemistry Letters - During the last 30 years, environmental issues about the chemical and biological contaminations of water have become a major concern for society, public... 相似文献
510.
Alexander L. Metcalf Conor N. Phelan Cassandra Pallai Michael Norton Ben Yuhas James C. Finley Allyson Muth 《Conservation biology》2019,33(5):1141-1150
Widespread human action and behavior change is needed to achieve many conservation goals. Doing so at the requisite scale and pace will require the efficient delivery of outreach campaigns. Conservation gains will be greatest when efforts are directed toward places of high conservation value (or need) and tailored to critical actors. Recent strategic conservation planning has relied primarily on spatial assessments of biophysical attributes, largely ignoring the human dimensions. Elsewhere, marketers, political campaigns, and others use microtargeting—predictive analytics of big data—to identify people most likely to respond positively to particular messages or interventions. Conservationists have not yet widely capitalized on these techniques. To investigate the effectiveness of microtargeting to improve conservation, we developed a propensity model to predict restoration behavior among 203,645 private landowners in a 5,200,000 ha study area in the Chesapeake Bay Watershed (U.S.A.). To isolate the additional value microtargeting may offer beyond geospatial prioritization, we analyzed a new high-resolution land-cover data set and cadastral data to identify private owners of riparian areas needing restoration. Subsequently, we developed and evaluated a restoration propensity model based on a database of landowners who had conducted restoration in the past and those who had not (n = 4978). Model validation in a parallel database (n = 4989) showed owners with the highest scorers for propensity to conduct restoration (i.e., top decile) were over twice as likely as average landowners to have conducted restoration (135%). These results demonstrate that microtargeting techniques can dramatically increase the efficiency and efficacy of conservation programs, above and beyond the advances offered by biophysical prioritizations alone, as well as facilitate more robust research of many social–ecological systems. 相似文献