全文获取类型
收费全文 | 364篇 |
免费 | 1篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 12篇 |
环保管理 | 29篇 |
综合类 | 105篇 |
基础理论 | 67篇 |
环境理论 | 1篇 |
污染及防治 | 105篇 |
评价与监测 | 25篇 |
社会与环境 | 19篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 7篇 |
2022年 | 4篇 |
2021年 | 18篇 |
2020年 | 10篇 |
2019年 | 6篇 |
2018年 | 17篇 |
2017年 | 17篇 |
2016年 | 18篇 |
2015年 | 13篇 |
2014年 | 16篇 |
2013年 | 29篇 |
2012年 | 26篇 |
2011年 | 28篇 |
2010年 | 10篇 |
2009年 | 18篇 |
2008年 | 16篇 |
2007年 | 25篇 |
2006年 | 22篇 |
2005年 | 9篇 |
2004年 | 15篇 |
2003年 | 13篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1967年 | 1篇 |
1962年 | 1篇 |
1961年 | 2篇 |
1957年 | 2篇 |
1956年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有373条查询结果,搜索用时 15 毫秒
71.
Stéphanie Rossignol Florian Couvidat Caroline Rio Sébastien Fable Guillaume Grignion Savelli Olivier Pailly Eva Leoz-Garziandi Jean-Francois Doussin Laura Chiappini 《环境科学学报(英文版)》2016,28(2):92-104
Molecular speciation of atmospheric organic matter was investigated during a short summer field campaign performed in a citrus fruit field in northern Corsica(June 2011). Aimedat assessing the performance on the field of newly developed analytical protocols, this work focuses on the molecular composition of both gas and particulate phases and provides an insight into partitioning behavior of the semi-volatile oxygenated fraction. Limonene ozonolysis tracers were specifically searched for, according to gas chromatography–mass spectrometry(GC–MS) data previously recorded for smog chamber experiments. A screening of other oxygenated species present in the field atmosphere was also performed. About sixty polar molecules were positively or tentatively identified in gas and/or particle phases. These molecules comprise a wide range of branched and linear, mono and di-carbonyls(C_3–C7),mono and di-carboxylic acids(C_3–C_18), and compounds bearing up to three functionalities.Among these compounds, some can be specifically attributed to limonene oxidation and others can be related to α- or β-pinene oxidation. This provides an original snapshot of the organic matter composition at a Mediterranean site in summer. Furthermore, for compounds identified and quantified in both gaseous and particulate phases, an experimental gas/particle partitioning coefficient was determined. Several volatile products, which are not expected in the particulate phase assuming thermodynamic equilibrium, were nonetheless present in significant concentrations. Hypotheses are proposed to explain these observations, such as the possible aerosol viscosity that could hinder the theoretical equilibrium to be rapidly reached. 相似文献
72.
Eva S. Stangler Stefan Jarau Michael Hrncir Ronaldo Zucchi Manfred Ayasse 《Chemoecology》2009,19(1):13-19
Foragers of several species of stingless bees deposit pheromone spots in the vegetation to guide recruited nestmates to a
rich food source. Recent studies have shown that Trigona and Scaptotrigona workers secrete these pheromones from their labial glands. An earlier report stated that species within the genus Geotrigona use citral from their mandibular glands for scent marking. Since convincing experimental proof for this conjecture is lacking,
we studied the glandular origin of the trail pheromone of Geotrigona mombuca. In field bioassays, newly recruited bees were diverted by artificial scent trails that branched off from the natural scent
trail deposited by their nestmates only when they were baited with extracts from the foragers’ labial glands. Compounds extracted
from the mandibular glands, however, did not release trail following behavior. This demonstrates that the trail pheromone
of G. mombuca is produced in the labial glands, as in Trigona and Scaptotrigona. Furthermore, in chemical analyses citral was identified exclusively in the foragers’ mandibular glands, which disproves
its supposed role as a trail pheromone. The labial glands contained a series of terpene- and wax type esters, with farnesyl
butanoate as major constituent. We, therefore, postulate that the trail pheromone of G. mombuca is composed of a blend of esters. 相似文献
73.
Skeletal dysplasias are a heterogeneous group of conditions, many of which present unexpectedly in the prenatal period with a variety of ultrasound findings. Accurate prenatal diagnosis can now be facilitated using exome sequencing approaches, but in order to interpret results, accurate and detailed phenotyping is required. Here, we describe the sonographic approach to the prenatal diagnosis of skeletal abnormalities and illustrate how taking a systematic approach can facilitate diagnosis. 相似文献
74.
Markus Stumm Michael Entezami Karsten Haug Cornelia Blank Max Wüstemann Bernt Schulze Gisela Raabe-Meyer Maja Hempel Markus Schelling Eva Ostermayer Sabine Langer-Freitag Tilo Burkhardt Roland Zimmermann Tina Schleicher Bernd Weil Ulrike Schöck Patricia Smerdka Sebastian Grömminger Yadhu Kumar Wera Hofmann 《黑龙江环境通报》2014,34(2):185-191
75.
Lévêque Thibaut Dumat Camille Lagier Laura Schreck Eva Ruales Jenny Capowiez Yvan 《Environmental science and pollution research international》2019,26(20):20052-20063
Environmental Science and Pollution Research - At the global scale, urban agriculture is increasingly developing in cities due to demographic growth and sustainable food concerns. But, urban soils... 相似文献
76.
77.
78.
The magnitude of the environmental and social consequences of soil erosion and land degradation in semiarid areas of the Mediterranean
region has long been recognized and studied. This paper investigates the interrelationship between land use/cover (LULC) changes
and land degradation using remotely sensed and ancillary data for southeastern Spain. The area of study, the Xaló River catchment
situated in the north of the Alicante Province, has been subjected to a number of LULC changes during the second half of the
20th century such as agricultural abandonment, forest fires, and tourist development. Aerial photographs dating back to 1956
were used for the delineation of historic LULC types; Landsat ETM+ data were used for the analysis and mapping of current
conditions. Two important indicators of land degradation, namely, susceptibility to surface runoff and soil erosion, were
estimated for the two dates using easily parametrizable models. The comparison of 1956 to 2000 conditions shows an overall
“recuperating” trend over the catchment and increased susceptibility to soil erosion only in 3% of the catchment area. The
results also identify potential degradation hot-spots where mitigation measures should be taken to prevent further degradation.
The readily implemented methodology, based on modest data requirements demonstrated by this study, is a useful tool for catchment
to regional scale land use change and land degradation studies and strategic planning for environmental management. 相似文献
79.
Surface marine sediments from Ría de Arousa estuary were analyzed for humic and fulvic acids by UV-visible spectrometry and have been characterized using elemental analysis (carbon, hydrogen and nitrogen elemental composition) and spectrometric data (A2/A4 ratio, absorbancies at 270 and 407 nm and E4/E6 ratio, absorbancies at 465 and 665 nm). These variables have been used as discriminating factors to distinguish of marine and terrestrial origin of humic and fulvic acids in Ría de Arousa surface marine sediments. Principal component analysis, PCA, and cluster analysis, CA, have been used as unsupervised pattern recognition procedures. The half-range central value transformation was used as data pre-treatment to homogenize data. After a Varimax rotation, PCA applied to humic acid data has reveled that spectrometric A2/A4 and E4/E6 ratios are the main dominating features in the first principal component (48.6% of total variance), the humic acid content is the feature with the highest weight in the second principal component (22.9% of the total variability) and the carbon elemental composition domain in the third principal component (13.3% of total variance). Results from PCA have revealed that surface sediments collected at inner-left part of the estuary and at the mouth of the river Ulla belong to the same group. Similarly, PCA has shown that surface sediments from the right mouth of the estuary form a compact group. Taking in account the water circulation in Ría de Arousa estuary, these findings mean that the organic matter in surface sediments from the inner-left part of the estuary derived mainly from terrestrial organic matter while the organic matter in surface sediments from the right mouth of the estuary is mainly derived from marine sources. Finally, it must be noticed that any classification of surface sediments was assessed when applying of PCA and CA from fulvic acids data. 相似文献
80.
Establishment of Carex rostrata, Eriophorum angustifolium and Phragmites australis on weathered, acidic mine tailings (pH approximately 3) and their effect on pH in tailings were investigated in a field experiment. The amendments, sewage sludge and an ashes-sewage sludge mixture, were used as plant nutrition and their influence on the metal and As concentrations of plant shoots was analysed. An additional experiment was performed in greenhouse with E. angustifolium and sewage sludge as amendments in both weathered and unweathered tailings. After one year, plants grew better in amendments containing ashes in the field, also in those plants the metal and As shoot concentrations were generally lower than in other treatments. After two years, the only surviving plants were found in sewage sludge mixed with ashes. No effect on pH by plants was found in weathered acidic mine tailings in either field- or greenhouse experiment. 相似文献