全文获取类型
收费全文 | 101篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 11篇 |
环保管理 | 2篇 |
综合类 | 35篇 |
基础理论 | 33篇 |
污染及防治 | 12篇 |
评价与监测 | 5篇 |
社会与环境 | 3篇 |
出版年
2017年 | 3篇 |
2016年 | 3篇 |
2014年 | 2篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1960年 | 2篇 |
1958年 | 3篇 |
1957年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
排序方式: 共有103条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
August Kaiser Helfried Scheifinger Wolfgang Spangl Andrea Weiss Stefan Gilge Wolfgang Fricke Ludwig Ries Danijel Cemas Brigita Jesenovec 《Atmospheric environment (Oxford, England : 1994)》2007,41(40):9273-9287
The Alpine stations Zugspitze, Hohenpeissenberg, Sonnblick, Jungfraujoch and Mt. Krvavec contribute to the Global Atmosphere Watch Programme (GAW) of the World Meteorological Organization (WMO). The aim of GAW is the surveillance of the large-scale chemical composition of the atmosphere. Thus, the detection of air pollutant transport from regional sources is of particular interest. In this paper, the origin of NOx (measured with a photo-converter), CO and O3 at the four Alpine GAW stations is studied by trajectory residence time statistics. Although these methods originated during the early 1980s, no comprehensive study of different atmospheric trace gases measured simultaneously at several background observatories in the Alps was conducted up to present.The main NOx source regions detected by the trajectory statistics are the northwest of Europe and the region covering East Germany, Czech Republic and southeast Poland, whereas the main CO source areas are the central, north eastern and eastern parts of Europe with some gradient from low to high latitudes. Subsiding air masses from west and southwest are relatively poor in NOx and CO.The statistics for ozone show strong seasonal effects. Near ground air masses are poor in ozone in winter but rich in ozone in summer. The main source for high ozone concentration in winter is air masses that subside from higher elevations, often enhanced by foehn effects at Hohenpeissenberg. During summer, the Mediterranean constitutes an important additional source for high ozone concentrations.Especially during winter, large differences between Hohenpeissenberg and the higher elevated stations are found. Hohenpeissenberg is frequently within the inversion, whereas the higher elevated stations are above the inversion.Jungfraujoch is the only station where the statistics detect an influence of air rich in CO and NOx from the Po Basin. 相似文献
45.
A method for attaching acoustic transmitters externally to deep-water fishes in situ is described. Tags, each comprising
a transmitter connected to a dart, were fired at fish from a pneumatic gun held by the manipulator arm of a submersible. The
method was applied successfully for tagging coelacanths and may have application for use with other species of fishes living
at depths to about 1000 m. The usefulness of direct observation for monitoring the effects of tags on fish is evaluated in
relation to the effects of the tagging method on coelacanths.
Received: 3 January 1997 / Accepted: 25 January 1997 相似文献
46.
Ultrastructural evidence is presented of a chromatophoresystem in the zooxanthellae containing hermatypic, deep-water coral Leptoseris fragilis (Milne Edwards and Haime). It consists of multilobed cells which mainly occupy the intercellular space of the oral gastrodermis. The cellular processes are filled with electron-dense granules up to 1-m-long and 0.5-m-wide. Within the cytoplasm an elaborate system of microtubules is established. The ramifications of the pigment cells, containing the pigment granules, form a dense and nearly continuous layer close to the overlying zooxanthellae. It is speculated that host pigments may transform the violet portion of the incident light into longer wavelengths, thus increasing the photosynthetic efficiency of the zooxanthellae. 相似文献
47.
R. Fricke 《Die Naturwissenschaften》1941,29(24-25):365-365
48.
H. Fricke O. Giere K. Stetter G. A. Alfredsson J. K. Kristjansson P. Stoffers J. Svavarsson 《Marine Biology》1989,102(3):425-429
A new type of animal community has been found near hot vents in the subpolar Atlantic at 100 to 106 m depth off Kolbeinsey on the Jan-Mayen ridge. Incubation of high temperature fluids yielded cultures of undescribed hyperthermophilic eu- and archaebacteria, growing in a temperature range between 70° and 110°C depending on the isolates. Bacteria are closely related to species occurring within deep sea hydrothermal areas. In contrast to deep-sea vent sites of the Mid-Atlantic and other oceans, the Kolbeinsey macro- and meiofauna consists of species reported from non-vent areas in the boreal Atlantic and adjacent polar seas. The most abundant forms are a solitary hydroid polyp and two sponges. Kolbeinsey is an isolated and young area of hydrothermal activity at relatively low depth and in highly productive waters; these findings could indicate a model for an early evolutionary step towards the formation of a genuine specialized vent community. 相似文献
49.
Helge?SchlünsEmail author Gudrun?Koeniger Nikolaus?Koeniger Robin?F.?A.?Moritz 《Behavioral ecology and sociobiology》2004,56(5):458-463
Queen honeybees (Apis mellifera) mate with a large number of drones on their nuptial flights. Not all drones contribute equally to the queens offspring and the queens utilization pattern of spermatozoa from different drones has an important impact on the genetic composition of the colony. Here we study the consequences of sperm use for the fitness of the queens mates with microsatellite DNA-fingerprinting. Eight queens were instrumentally inseminated with semen of six or seven drones. Each drone contributed either 0.5 µl or 1.0 µl semen, respectively, and we analyzed both the impact of the insemination sequence and the amount of semen on the sperm utilization. Our data show no significant effect of the insemination sequence but a strong impact of the semen volume of a drone on the frequency of his worker offspring in the colony. This effect was not linear and the patriline frequencies of the drones contributing larger semen volumes are disproportionately enhanced. If these observations are also valid for natural matings, drone honeybees should maximize the number of sperm but not apply specific mating tactics to be first or last male in a mating sequence.Communicated by R. PageAn erratum to this article can be found at 相似文献
50.
Gudrun Fricke Jörg Hellhammer Andreas Klamt Jan Meerkamp van Embden Manfred Rose Birgit Sewekow Rolf Wittlinger 《Environmental Sciences Europe》1995,7(5):275-279
The substituent chlorine is generally considered to be an agent which reduces the reactivity of organic molecules with regard to the indirect photodegradation by OH radicals. A systematic study of selected, representative classes of compounds, however, reveals that the deactivating influence of chlorine on the OH radical reactivity is actually rather moderate. In individual cases, for instance, chlorine substitution can even lead to an increase in this reactivity. This study is based on both experimental data and on the molecular orbital calculations of OH radical reactivity. 相似文献