全文获取类型
收费全文 | 136篇 |
免费 | 1篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 6篇 |
环保管理 | 9篇 |
综合类 | 31篇 |
基础理论 | 34篇 |
污染及防治 | 39篇 |
评价与监测 | 6篇 |
社会与环境 | 10篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 9篇 |
2012年 | 11篇 |
2011年 | 10篇 |
2010年 | 5篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 1篇 |
2006年 | 6篇 |
2005年 | 1篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 4篇 |
2001年 | 11篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
1961年 | 1篇 |
1956年 | 1篇 |
1938年 | 1篇 |
1937年 | 1篇 |
排序方式: 共有140条查询结果,搜索用时 0 毫秒
31.
The geochemistry, mineralogy, acidity and electric conductivity of sulphide-bearing postglacial sediments located on the coastal plains of western Finland were studied. Grain size and mineralogical analysis (eight samples studied) indicated that the sediments are silts dominated by primary minerals (quartz, feldspars), and that the clay fraction (<2µm), which made up less than one-third of the bulk samples, is enriched in phyllosilicates but depleted in quartz and feldspars, relative to bulk samples. As compared to the metal contents of the fine-fraction of glacial till (data of the Geological Survey of Finland), the fine sediments appear to be enriched in sulphur (median = 0.54%) and trace metals such as Ni (31 µg g–1), Zn (90 µg g–1), Co (13 µg g–1), Cr (48 µg g–1) and V (50 µg g–1). Statistical analysis indicated that aluminosilicates are the principal carrier phases of trace metals, and that sulphides and organic matter only partially control the distribution of elements other than S and C. A 3-g portion of 232 samples was oxidised in the laboratory by atmospheric oxygen for a period of 1 year. After this period of oxidation, 15 ml of water was added, after which pH and electric conductivity of the suspensions (sediment:water, 1:5) were measured. The quantities of elements mobilised by the oxidation was calculated from the dissolved concentrations found in 3 g of oxidised sediment suspended in 30 ml of deionised water (eight samples studied). The results of the experiment showed that the impact of sulphide oxidation on the pH and conductivity of the sediments is large, and that a high proportion (>13%) of the aqua-regia extractable contents of several elements (Co, Mn, Ca, Ni, Zn, Sr, Na and B) are mobilised at oxidation. Because of the high quantities of acidity and metals liberated at oxidation, it is argued that stream-water quality, which is poor in the study area, will not improve unless artificial draining is restricted in areas of sulphide sediments. 相似文献
32.
Åke Berg Bengt Ehnström Lena Gustafsson Tomas Hallingbäck Mats Jonsell Jan Weslien 《Conservation biology》1995,9(6):1629-1633
33.
Orientation can be difficult for nocturnal bird migrants at high northern latitudes because of the large changes of magnetic
declinations, rapid longitudinal time-shifts experienced during a long-distance flight and the invisibility of stars during
the polar summer. Both sunset cues as well as geomagnetic cues have been shown to be of great importance in the orientation
system of Savannah sparrows, Passerculus sandwichensis. We used clock-shift experiments to investigate whether geomagnetic and sunset cues were used for migratory orientation by
wild-caught young Savannah sparrows at high geomagnetic latitudes in Northern Canada. We exposed birds to a 4-h slow clock-shift,
expecting a 60° clock-wise shift in orientation after the treatment. Under natural clear skies in the local geomagnetic field,
the birds responded by showing a significant axial mean orientation directed towards the position of the setting sun in the
NW and towards their preferred migratory direction in the SE. After exposure to the clock-shift for 6 days and nights the
birds showed a clear response to the treatment and shifted significantly towards NNE. Birds that first oriented towards NW
in the experiments before clock-shift tended to shift clock-wise, thus reacted to the clock-shift in the expected way. The
reaction of the individual birds that originally oriented towards SE seems to vary. In summary, our birds did not select a
constant angle (menotaxis) in relation to the sun's position during the experiments, but presumably were affected by the sun
showing phototaxis or followed their magnetic compass. Possible explanations of the unexpected experimental results are discussed.
Electronic Publication 相似文献
34.
Two closely related forms ofOphrys insectifera were observed in the field to attract different pollinator species selectively.O. i. ssp.insectifera attracted males of two species ofArgogorytes (Sphecidae, Hymenoptera Aculeata) andO. i. ssp.aymoninii attractedAndrena combinata males (Andrenidae, Apoidea, Hymenoptera Aculeata). A third form,O. aff.i. ssp.insectifera, attracted none of these three species. Volatile compounds from flowers and inflorescences of the three forms (originating from Öland, Sweden, and Aveyron, France) were collected, using entrainment, enfleurage, and solvent extraction techniques, and identified by gas chromatography — mass spectrometry. Scent differences between the three forms were confirmed in the amounts of aliphatic hydrocarbons (C11–C19), methyl esters (C14–C18), short chain aliphatic 1-alcohols (C6–C12), and monoterpene alcohols (C10). 相似文献
35.
The aim of this study was to analyse the occurrence of corncrakes in two Swedish meadow sites managed by mowing and grazing, but also with abandoned meadows. Most corncrakes (58%) on meadows were found in unmanaged areas without subsidies to the farmers (i.e. areas with tall vegetation). Several corncrakes (62%) were found in restored areas, managed for less than 10 of the last 40 years, fewer (38%) in areas under continuous management. Vegetation height was negatively associated with number of years of management the last 40 years, and the continuously managed areas were avoided by corncrakes. Sites where corncrake territories occur regularly should be managed to maintain tall vegetation suitable for the species, which requires increased use of mowing. However, the results from our study also suggest that yearly mowing might result in a vegetation structure that is avoided by corncrakes. To achieve a balance between tall grassy vegetation and prevention of succession to scrub a possible management regime would therefore be mowing at intervals of a few years. 相似文献
36.
Pignon Baptiste Borel Cynthia Lajnef Mohamed Richard Jean-Romain Szöke Andrei Hemery François Leboyer Marion Foret Gilles Schürhoff Franck 《Environmental science and pollution research international》2022,29(59):88577-88586
Environmental Science and Pollution Research - Particulate matters with a diameter of less than 10 µm (PM10) or less than 2.5 µm (PM2.5) are major air pollutants. Their... 相似文献
37.
A sampling and analysis method for PAH from two-stroke engines is described. The method, which uses a standard glass fiber filter with a back-up section of Amberlite XAD-2 for sampling and GC or GC-MS for analysis, is suitable for both emission studies and occupational studies during logging. Filters and XAD-2 are desorbed with cyclohexane in an ultrasonic bath. After separation on a silica-gel micro column, the samples are submitted to analyses by capillary GC. The method is simple and covers both gaseous and particulate PAH. Naphthalene and alkyl substituted naphthalenes are also quantified. 相似文献
38.
工业开发区区域环评的特点 总被引:5,自引:0,他引:5
杨乃克 《城市环境与城市生态》2000,13(3):43-44
从工业区域开发与单项建设项目的区别入手 ,阐述工业开发区区域环境评价的特点 ,并提出区域环评中在技术方法上需要进一步丰富和发展的工作内容。 相似文献
39.
Occurrence and risk assessment of trace metals and metalloids in sediments and benthic invertebrates from Dianshan Lake,China 总被引:1,自引:0,他引:1
Wu Yan Zhou Yihui Qiu Yanling Chen Da Zhu Zhiliang Zhao Jianfu Bergman Ǻke 《Environmental science and pollution research international》2017,24(17):14847-14856
Environmental Science and Pollution Research - The present study measured concentrations of Cr, Ni, Cu, Zn, As, Cd, Sb, and Pb in surface sediments and two benthic invertebrate species (Anodonta... 相似文献
40.