全文获取类型
收费全文 | 698篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 21篇 |
废物处理 | 23篇 |
环保管理 | 223篇 |
综合类 | 59篇 |
基础理论 | 163篇 |
污染及防治 | 163篇 |
评价与监测 | 27篇 |
社会与环境 | 24篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 4篇 |
2022年 | 4篇 |
2021年 | 8篇 |
2020年 | 7篇 |
2019年 | 9篇 |
2018年 | 11篇 |
2017年 | 10篇 |
2016年 | 25篇 |
2015年 | 17篇 |
2014年 | 24篇 |
2013年 | 69篇 |
2012年 | 30篇 |
2011年 | 27篇 |
2010年 | 17篇 |
2009年 | 26篇 |
2008年 | 27篇 |
2007年 | 30篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 32篇 |
2003年 | 27篇 |
2002年 | 20篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 7篇 |
1998年 | 17篇 |
1997年 | 6篇 |
1996年 | 9篇 |
1995年 | 3篇 |
1994年 | 17篇 |
1993年 | 11篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 12篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 11篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1967年 | 2篇 |
排序方式: 共有710条查询结果,搜索用时 109 毫秒
401.
Samuel A. Miller Steve W. Lyon Richard H. Moore 《Journal of the American Water Resources Association》2023,59(1):161-177
In the early 2000s, a phosphorus nutrient trading plan (NTP) requiring best management practices (BMPs) to be installed as pollution abatement strategies to offset phosphorus waste from the Alpine Cheese Company was implemented in four subwatersheds of Sugar Creek in northeast Ohio. To assess the impacts of the Alpine NTP, 49 sites were sampled approximately biweekly from 2010 to 2018 for phosphate, total phosphorus, nitrate, ammonia, and total nitrogen. In addition, the Ohio Environmental Protection Agency conducted stream health surveys at 21 sites before and after the BMPs were implemented. This study evaluated the potential impact of 68 BMPs implemented under the NTP on the observed changes in nutrient concentrations and stream health indicators. Most nutrient concentrations observed during high discharge conditions showed significant declines from 2010 to 2018 for all subwatersheds, which was most likely due to BMPs that reduced erosion and surface runoff. However, there were fewer significant declines and some significant increases in nutrient levels during low discharge conditions, suggesting a possible contribution from legacy nutrient sources. Most sites reported increases in stream health indicators, but many streams are still below recommended levels. Collectively, the installation of BMPs and decreases in nutrient concentrations observed during high discharge conditions can be attributed to the NTP and likely contributed to improved stream health. 相似文献
402.
Withers Paul J. A. Forber Kirsty G. Lyon Christopher Rothwell Shane Doody Donnacha G. Jarvie Helen P. Martin-Ortega Julia Jacobs Brent Cordell Dana Patton Myles Camargo-Valero Miller A. Cassidy Rachel 《Ambio》2020,49(5):1076-1089
Ambio - The chaotic distribution and dispersal of phosphorus (P) used in food systems (defined here as disorderly disruptions to the P cycle) is harming our environment beyond acceptable limits. An... 相似文献
403.
Miller AL Drake PL Murphy NC Noll JD Volkwein JC 《Journal of environmental monitoring : JEM》2012,14(1):48-55
Miners face a variety of respiratory hazards while on the job, including exposure to silica dust which can lead to silicosis, a potentially fatal lung disease. Currently, field-collected filter samples of silica are sent for laboratory analysis and the results take weeks to be reported. Since the mining workplace is constantly moving into new and often different geological strata with changing silica levels, more timely data on silica levels in mining workplaces could help reduce exposures. Improvements in infrared (IR) spectroscopy open the prospect for end-of-shift silica measurements at mine sites. Two field-portable IR spectrometers were evaluated for their ability to quantify the mass of silica on filter samples loaded with known amounts of either silica or silica-bearing coal dust (silica content ranging from 10-200 μg/filter). Analyses included a scheme to correct for the presence of kaolin, which is a confounder for IR analysis of silica. IR measurements of the samples were compared to parallel measurements derived using the laboratory-based U.S. Mine Safety and Health Administration P7 analytical method. Linear correlations between Fourier transform infrared (FTIR) and P7 data yielded slopes in the range of 0.90-0.97 with minimal bias. Data from a variable filter array spectrometer did not correlate as well, mainly due to poor wavelength resolution compared to the FTIR instrument. This work has shown that FTIR spectrometry has the potential to reasonably estimate the silica exposure of miners if employed in an end-of-shift method. 相似文献
404.
Michael A. Miller Alison C. C. Colby Paul D. Kanehl Karen Blocksom 《Environmental monitoring and assessment》2009,150(1-4):75-89
The Wisconsin Department of Natural Resources (WDNR), with support from the U.S. EPA, conducted an assessment of wadeable streams in the Driftless Area ecoregion in western Wisconsin using a probabilistic sampling design. This ecoregion encompasses 20% of Wisconsin’s land area and contains 8,800 miles of perennial streams. Randomly-selected stream sites (n = 60) equally distributed among stream orders 1–4 were sampled. Watershed land use, riparian and in-stream habitat, water chemistry, macroinvertebrate, and fish assemblage data were collected at each true random site and an associated “modified-random” site on each stream that was accessed via a road crossing nearest to the true random site. Targeted least-disturbed reference sites (n = 22) were also sampled to develop reference conditions for various physical, chemical, and biological measures. Cumulative distribution function plots of various measures collected at the true random sites evaluated with reference condition thresholds, indicate that high proportions of the random sites (and by inference the entire Driftless Area wadeable stream population) show some level of degradation. Study results show no statistically significant differences between the true random and modified-random sample sites for any of the nine physical habitat, 11 water chemistry, seven macroinvertebrate, or eight fish metrics analyzed. In Wisconsin’s Driftless Area, 79% of wadeable stream lengths were accessible via road crossings. While further evaluation of the statistical rigor of using a modified-random sampling design is warranted, sampling randomly-selected stream sites accessed via the nearest road crossing may provide a more economical way to apply probabilistic sampling in stream monitoring programs. 相似文献
405.
Shape and efficiency of wood ant foraging networks 总被引:2,自引:1,他引:1
Jerome Buhl Kerri Hicks Esther R. Miller Sophie Persey Ola Alinvi David J. T. Sumpter 《Behavioral ecology and sociobiology》2009,63(3):451-460
We measured the shape of the foraging trail networks of 11 colonies of the wood ant Formica aquilonia (Formica rufa group). We characterized these networks in terms of their degree of branching and the angles between branches, as well as
in terms of their efficiency. The measured networks were compared with idealized model networks built to optimize one of two
components of efficiency, total length (i.e., total amount of trail) and route factor (i.e., average distance between nest
and foraging site). The analysis shows that the networks built by the ants obtain a compromise between the two modes of efficiency.
These results are largely independent of the size of the network or colony size. The ants’ efficiency is comparable to that
of networks built by humans but achieved without the benefit of centralized control. 相似文献
406.
Variation at five microsatellite loci (Sal1, Sal2, Sal3, Sal4 and Sal5) was examined in approximately 1300 Pacific ocean perch (Sebastes alutus) sampled from 14 coastal sites in British Columbia, Canada. Mean observed heterozygosities by locus ranged from 71% to 88%, and by sample ranged from 75% to 84%. Theta values ranged from 0 to 0.04 over the five loci, and averaged 0.015. Among Pacific ocean perch samples, ranged from 0.001 to 0.056. Canonical discriminate analysis of multilocus genotypes and neighbour-joining analysis of pairwise genetic distances between samples both indicated the presence of three populations, one off the west coast of Vancouver Island (the Vancouver Island population) and two co-existing populations in Queen Charlotte Sound, Dixon Entrance and along the west coast of the Queen Charlotte Islands (the eastern and western QCI populations). Pacific ocean perch of the eastern and western QCI populations were caught in close proximity to each other, but individual samples showed little evidence of admixture. Fall and spring samples collected within geographic areas were genetically similar, indicating seasonally stable population structure. Restricted gene flow between the Vancouver Island and the two more northerly populations may result from limited adult dispersal and larval retention within the California Current and Alaska Gyre, respectively, but the presence of two populations within Queen Charlotte Sound cannot be explained entirely by larval retention hypotheses. The presence of two Pacific ocean perch populations in central British Columbia has implications for fisheries management. 相似文献
407.
Arrival time and magnitude of airborne fission products from the Fukushima, Japan, reactor incident as measured in Seattle, WA, USA 总被引:2,自引:0,他引:2
Leon JD Jaffe DA Kaspar J Knecht A Miller ML Robertson RG Schubert AG 《Journal of environmental radioactivity》2011,102(11):1032-1038
We report results of air monitoring started due to the recent natural catastrophe on 11 March 2011 in Japan and the severe ensuing damage to the Fukushima Dai-ichi nuclear reactor complex. On 17-18 March 2011, we registered the first arrival of the airborne fission products 131I, 132I, 132Te, 134Cs, and 137Cs in Seattle, WA, USA, by identifying their characteristic gamma rays using a germanium detector. We measured the evolution of the activities over a period of 23 days at the end of which the activities had mostly fallen below our detection limit. The highest detected activity from radionuclides attached to particulate matter amounted to 4.4 ± 1.3 mBq m−3 of 131I on 19-20 March. 相似文献
408.
Yan B Kennedy D Miller RL Cowin JP Jung KH Perzanowski M Balletta M Perera FP Kinney PL Chillrud SN 《Atmospheric environment (Oxford, England : 1994)》2011,45(39):7478-7486
Exposure of black carbon (BC) is associated with a variety of adverse health outcomes. A number of optical methods for estimating BC on Teflon filters have been adopted but most assume all light absorption is due to BC while other sources of colored particulate matter exist. Recently, a four-wavelength-optical reflectance measurement for distinguishing second hand cigarette smoke (SHS) from soot-BC was developed (Brook et al., 2010; Lawless et al., 2004). However, the method has not been validated for soot-BC nor SHS and little work has been done to look at the methodological issues of the optical reflectance measurements for samples that could have SHS, BC, and other colored particles. We refined this method using a lab-modified integrating sphere with absorption measured continuously from 350 nm to 1000 nm. Furthermore, we characterized the absorption spectrum of additional components of particulate matter (PM) on PM(2.5) filters including ammonium sulfate, hematite, goethite, and magnetite. Finally, we validate this method for BC by comparison to other standard methods. Use of synthesized data indicates that it is important to optimize the choice of wavelengths to minimize computational errors as additional components (more than 2) are added to the apportionment model of colored components. We found that substantial errors are introduced when using 4 wavelengths suggested by Lawless et al. to quantify four substances, while an optimized choice of wavelengths can reduce model-derived error from over 10% to less than 2%. For environmental samples, the method was sensitive for estimating airborne levels of BC and SHS, but not mass loadings of iron oxides and sulfate. Duplicate samples collected in NYC show high reproducibility (points consistent with a 1:1 line, R(2) = 0.95). BC data measured by this method were consistent with those measured by other optical methods, including Aethalometer and Smoke-stain Reflectometer (SSR); although the SSR looses sensitivity at filter loadings above 90 ng/mm(2). Furthermore, positive correlations (R(2) = 0.7) were observed between EC measured by NIOSH Method 5040 on quartz filters and BC measured in co-located Teflon filter samples collected from both heating and non-heating seasons. Overall, the validation data demonstrates the usefulness of this method to evaluate BC from archived Teflon filters while potentially providing additional component information. 相似文献
409.
Around the globe, human behavior and ecosystem health have been extensively and sometimes severely affected by the unprecedented COVID-19 pandemic. Most efforts to study these complex and heterogenous effects to date have focused on public health and economics. Some studies have evaluated the pandemic’s influences on the environment, but often on a single aspect such as air or water pollution. The related research opportunities are relatively rare, and the approaches are unique in multiple aspects and mostly retrospective. Here, we focus on the diverse research opportunities in disease ecology and ecosystem sustainability related to the (intermittent) lockdowns that drastically reduced human activities. We discuss several key knowledge gaps and questions to address amid the ongoing pandemic. In principle, the common knowledge accumulated from invasion biology could also be effectively applied to COVID-19, and the findings could offer much-needed information for future pandemic prevention and management. 相似文献
410.
ObjectivesTo better understand the information that is used in business cases for employee health activities.MethodsInterviews with 18 occupational health and safety professionals at major organisations in the UK were conducted to explore attitudes, motivations, behaviours and information needs about employee health investment.ResultsThe occupational health and safety professionals interviewed for this study have described how employee health issues are discussed in their organisations. Ethical arguments about it being the ‘right thing to do’ are common and are believed to have impact. Unsurprisingly legal compliance is stated to be the driver of most employee health activity. Higher-level activities and resource do require a business case. It is suggested that currently business cases for employee health are often not overly empirical, with more intuitive arguments appealing to people management issues, notions of corporate reputation and alignment with business objectives. Data on benchmarking and some kind of return-on-investment assessment are normally required. Data on cost of illness (mostly expressed via sickness absence), direct health expenditure per employee and insurance premiums are also used. These data are mostly captured by existing sources and procedural systems, although sickness absence data especially is often thought to be unreliable. Data on staff retention and productivity were considered relevant but not currently used or analysed by this sample. There was support for the notion that more robust empirical business cases may help overcome some of the barriers that were identified, for example where costs are more quantifiable than benefits.ConclusionsThere is scope to make significant improvements to the business case for employee health investments in UK organisations through better measurement of impact on productivity and reputation risk and greater business-aligned communication by health professionals. More empirical business cases that meet the needs of decision-makers are more likely to attract investment into employee health activities. 相似文献