全文获取类型
收费全文 | 367篇 |
免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 6篇 |
环保管理 | 14篇 |
综合类 | 148篇 |
基础理论 | 67篇 |
环境理论 | 1篇 |
污染及防治 | 102篇 |
评价与监测 | 11篇 |
社会与环境 | 16篇 |
灾害及防治 | 2篇 |
出版年
2021年 | 5篇 |
2018年 | 9篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 9篇 |
2014年 | 16篇 |
2013年 | 26篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 9篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 11篇 |
2002年 | 9篇 |
2001年 | 3篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1996年 | 8篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1985年 | 4篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1966年 | 3篇 |
1965年 | 5篇 |
1963年 | 7篇 |
1962年 | 4篇 |
1961年 | 3篇 |
1959年 | 5篇 |
1958年 | 5篇 |
1957年 | 3篇 |
1956年 | 11篇 |
1955年 | 8篇 |
1954年 | 4篇 |
1953年 | 3篇 |
1952年 | 3篇 |
1950年 | 3篇 |
1940年 | 3篇 |
1939年 | 4篇 |
1938年 | 3篇 |
1934年 | 4篇 |
1933年 | 3篇 |
1918年 | 2篇 |
1914年 | 2篇 |
1913年 | 2篇 |
排序方式: 共有369条查询结果,搜索用时 343 毫秒
301.
Introduced Pacific oysters (Crassostrea gigas) have shown rapid expansion in the Oosterschelde estuary, while stocks of native bivalves declined slightly or remained stable.
This indicates that they might have an advantage over native bivalve filter feeders. Hence, at the scale of individual bivalves,
we studied whether this advantage occurs in optimizing food intake over native bivalves. We investigated feeding current characteristics,
in which potential differences may ultimately lead to a differential food intake. We compared feeding currents of the invasive
epibenthic non-siphonate Pacific oyster to those of two native bivalve suspension feeders: the epibenthic siphonate blue mussel
Mytilus edulis and the endobenthic siphonate common cockle Cerastoderma edule. Inhalant flow fields were studied empirically using digital particle image velocimetry and particle tracking velocimetry.
Exhalant jet speeds were modelled for a range of exhalant-aperture cross-sectional areas as determined in the laboratory and
a range of filtration rates derived from literature. Significant differences were found in inhalant and exhalant current velocities
and properties of the inhalant flow field (acceleration and distance of influence). At comparable body weight, inhalant current
velocities were lower in C. gigas than in the other species. Modelled exhalant jets were higher in C. gigas, but oriented horizontally instead of vertically as in the other species. Despite these significant differences and apparent
morphological differences between the three species, absolute differences in feeding current characteristics were small and
are not expected to lead to significant differences in feeding efficiency. 相似文献
302.
Li Bing Yang Guishan Wan Rongrong Hörmann Georg 《Environmental science and pollution research international》2017,24(23):19138-19148
Environmental Science and Pollution Research - Comprehensively evaluating water quality with a single method alone is challenging because water quality evaluation involves complex, uncertain, and... 相似文献
303.
304.
Sholtz RI McLaughlin KR Cirillo PM Petreas M Park JS Wolff MS Factor-Litvak P Eskenazi B Krigbaum N Cohn BA 《Environment international》2011,37(4):709-714
Conserving irreplaceable, archived serum samples may sometimes conflict with the objective of minimizing measurement error due to laboratory effects. We sought to determine whether we could successfully combine assay results for DDT-related compounds and polychlorinated biphenyls (PCBs) in serum from the same birth cohort obtained from different laboratories over time. Using the Child Health and Development Studies (CHDS) serum archive, we compared variability for assays of a quality control pool to variability for assays of subject serum. The quality control pool was created from native archived serum samples that were pooled, then aliquoted, blinded and inserted pair-wise into assay batches along with the subject serum for 5 studies using CHDS samples conducted over a 13year period by three different laboratories. We found that the variability between laboratory and over time within laboratory was small relative to inter-individual variability for p,p'-DDT (1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane), p,p'-DDE (1,1'-dichloro-2,2'-bis(p-chlorophenyl)ethylene) and o,p'-DDT (1,1,1-trichloro-2-(p-chlorophenyl)-2-(o-chlorophenyl)-ethane). Results were also consistent for most PCB congeners which were detectable in 85% or more of samples. Our results suggest that it is possible to combine assays for DDT and PCB congeners measured at positive levels as they are accumulated for cohort subjects without risking meaningful misclassification due to variation stemming from laboratory or time period. This has significant implications for future study costs, conservation of irreplaceable archived samples and for leveraging past investments for future research. For PCB congeners with very low levels, findings caution against pooling of assays without further exploration. 相似文献
305.
306.
George T. Wolff 《Journal of the Air & Waste Management Association (1995)》2013,63(9):935-938
This report summarizes the important results which were presented at an international symposium on particulate elemental carbon in the atmosphere. The “Particulate Carbon: Atmospheric Life Cycle” symposium was sponsored by General Motors Research Laboratories on October 12–14, 1980. Supplemental background data are included. 相似文献
307.
George T. Wolff Carrie M. Stroup David P. Stroup 《Journal of the Air & Waste Management Association (1995)》2013,63(8):746-750
The technique to measure the coefficient of haze (COH) was developed in 1953 and was widely employed as a surrogate technique to measure total suspended particulate matter (TSP) in the 1960s. Because of the physical design of the sampler (known as the AISI Tape Sampler) used to measure COH, it was postulated that COH was directly related to the mass of fine elemental carbon particles (EC) with diameters less than 2.5 μm. To test the hypothesis, simultaneous samples of COH and EC were collected and analyzed during the 1981 Summer Study in Detroit. Regression analysis indicates that the two quantities are linearly related over the concentration range observed. Additional analyses indicate that COH is not related to TSP, fine particle mass, or light-scattering aerosol. Calculation of specific light absorption coefficients for EC from the COH data support the hypothesis that the tape sampler responds only to fine EC. A brief examination of historical COH data from Detroit suggests that the EC concentration has declined since 1972. This should be regarded as a preliminary assessment, however, until further verification of the COH-EC connection can be made. 相似文献
308.
Tobias Schulze Sara Weiss Emma Schymanski Mechthild Schmitt-Jansen Georg Streck 《Environmental pollution (Barking, Essex : 1987)》2010,158(5):1461-1599
The pharmaceutical diclofenac (DCF) is released in considerably high amounts to the aquatic environment. Photo-transformation of DCF was reported as the main degradation pathway in surface waters and was found to produce metabolites with enhanced toxicity to the green algae Scenedesmus vacuolatus. We identified and subsequently confirmed 2-[2-(chlorophenyl)amino]benzaldehyde (CPAB) as a transformation product with enhanced toxicity using effect-directed analysis. The EC50 of CPAB (4.8 mg/L) was a factor of 10 lower than that for DCF (48.1 mg/L), due to the higher hydrophobicity of CPAB (log Kow = 3.62) compared with DCF (log Dow = 2.04) at pH 7.0. 相似文献
309.
Wim J. Wolff 《Conservation biology》2000,14(3):876-885
Abstract: The various causes of extirpation of marine and estuarine species were investigated for the Dutch Wadden Sea to gain an impression of their relative importance. I obtained data from geological, archaeological, historical, and biological publications. At least 10 species of algae, 10 invertebrates, 13 fishes, 5 birds, and 4 marine mammals became extinct during the past 2000 years. Habitat destruction played a part in at least 26 cases, overexploitation in at least 17, and pollution in at least 3. Causes of the disappearance of two species are unknown. Introduction of exotic marine species was not involved in any of the extirpations. I compared this pattern of extinction to that of worldwide extinctions of marine and estuarine species, which have been attributed to overexploitation, habitat destruction, and in two cases to the introduction of terrestrial predators to the breeding habitats of marine birds. The results imply that conservation of marine species should address overexploitation and habitat destruction as the main causes of extinction. 相似文献
310.
Uta Berger Marion Glaser Boris Koch Gesche Krause Rubén Lara Ulrich Saint-Paul Dirk Schories Matthias Wolff 《Journal of Coastal Conservation》1999,5(2):125-134
The main objective of the MADAM project (Mangrove Dynamics and Management) is to generate the scientific basis enabling the
sustainable stewardship of the resources of the Caeté mangrove estuary in Northeast Brazil in the sense of integrated coastal
(zone) management. To achieve this, it is necessary to acquire in-depth knowledge of natural processes as well as of the relevant
institutional, cultural, economic, social and political dynamics. Causal linkages within the ecosystem, as well as between
ecosystem, economy and society, are analysed and explained via dynamic and trophic modelling. Scenario construction is intended
to forecast the effects of acute or chronic interference on utilized resources, and to answer wider, management-related questions
(e.g. restoration of destroyed areas, utilization potential for aquaculture). This paper describes the project strategy as
developed and modified in the context of research results from the initial 2-yr project phase. It is argued that a continuous
discussion process is essential to assess the validity of the strategies formulated at the beginning of a medium-time project,
particularly if the project is of interdisciplinary nature. 相似文献