全文获取类型
收费全文 | 332篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 4篇 |
环保管理 | 48篇 |
综合类 | 89篇 |
基础理论 | 44篇 |
环境理论 | 1篇 |
污染及防治 | 114篇 |
评价与监测 | 18篇 |
社会与环境 | 11篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 3篇 |
2021年 | 3篇 |
2018年 | 15篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2014年 | 8篇 |
2013年 | 22篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 6篇 |
2009年 | 13篇 |
2008年 | 15篇 |
2007年 | 18篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 11篇 |
2001年 | 10篇 |
2000年 | 7篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1991年 | 4篇 |
1988年 | 3篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1972年 | 5篇 |
1968年 | 4篇 |
1964年 | 3篇 |
1961年 | 2篇 |
1960年 | 2篇 |
1957年 | 3篇 |
1956年 | 2篇 |
1955年 | 6篇 |
1954年 | 3篇 |
1953年 | 2篇 |
1940年 | 2篇 |
1939年 | 5篇 |
排序方式: 共有338条查询结果,搜索用时 15 毫秒
241.
242.
243.
244.
Sixty five per cent of the Paleozoic basement of western and central Europe is hidden by a sedimentary cover and/or sea. This work aims to remove that blanket to detect new structures which could used to build a more comprehensive model of the Variscan orogeny. It is based on the interpretation of various forms of data: (a) published gravity maps corrected for the effects of the crust–mantle boundary topography and light sedimentary basins; (b) aeromagnetic maps; (c) measurements of densities; and (d) induced and remanent magnetizations on rocks from Paleozoic outcrops of the upper Rhenish area. From the northern Bohemian Massif to the eastern Paris Basin, the Saxothuringian is characterized by a 500?km long belt of gravity highs, the most important being the Kraichgau high. Most of the corresponding heavy bodies are buried under a post-early Viséan cover. They are interpreted as relics of Late Proterozoic terranes overlain by an Early to Middle Paleozoic sequence, equivalent to the Bohemian terrane in the Bohemian Massif. The most probable continuation of these dense Bohemian terranes toward the west is the Southern Channel–Northern Brittany Cadomian terrane. The gravity lows are correlated with Variscan granites and pre- and early Variscan metagranites. Gravity and magnetic maps demonstrate large-scale displacement in Devonian–Early Carboniferous times along the parallel and equidistant, NW–SE striking, Vistula, Elbe, Bavarian, Bray and South Armorican dextral wrench faults. In the Vosges–Schwarzwald and Central Massif the faults continue with the east–west striking Lalaye-Lubine–Baden-Baden and Marche faults and with south vergent thrusts. The Bavarian faults shift the Kraichgau terrane by 150?km relative to the Bohemian terrane, whereas the offset of the Northern Brittany Cadomian relative to the Northern Vosges–Kraichgau terranes is estimated at 400?km along the Bray fault. Sinistral wrench faults are the NE–SW striking Sillon Houiller, Rheingraben, Rodl, Vitis and Diendorf faults. The southern Vosges–Schwarzwald Devonian–Dinantian basin is interpreted as a pull-apart basin at the south-easterly extremity of the Bray fault. The Bohemian and Kraichgau body form allochthonous terranes which were thrust over the Saxothuringian crust. Thrusting to the north-west was accompanied by back-thrusting and led to the formation of pop-up structures. Contemporaneous dextral and sinistral wrench faulting resulted in transpressive strain during collision. The zonal structure of the Variscides in the sense of Kossmat (1927) is relevant only to the Rhenohercynian Foreland Belt. Kossmat (1927) already spoke of a Moldanubian Region because it displays no real zonal structure. The Saxothuringian Zone was formed by terrane accretion. Their apparent zonal structure is not a pre-collisional feature, but only the result of accretion and collision. 相似文献
245.
246.
247.
248.
249.
Issues in natural resources management in developing countries 总被引:1,自引:0,他引:1
Recognizing the steady depletion of natural resources in developing countries, this study analyses its causes by focusing on the ownership of such resources. Resource degradation was found associated with an array of individual, socioeconomic, politicoeconomic and institutional factors. In the pursuit of sustainable regional resources management and conservation, it is necessary to analyse and incorporate these multifarious factors into the design of a comprehensive strategy. While local government should be responsible for devising management strategies, their implementation requires the interfacing of field agencies with local communities that are to be assisted in the short term and instructed in depth; their performance should be closely monitored over the long term. 相似文献
250.
Matthew Rees Lloyd Sansom Allan Rofe Albert L. Juhasz Euan Smith John Weber Ravi Naidu Tim Kuchel 《Environmental geochemistry and health》2009,31(Z1):167-177
The assessment of arsenic (As) bioavailability from contaminated matrices is a crucial parameter for reducing the uncertainty
when estimating exposure for human health risk assessment. In vivo assessment of As utilising swine is considered an appropriate
model for human health risk assessment applications as swine are remarkably similar to humans in terms of physiology and As
metabolism. While limited in vivo As bioavailability data is available in the literature, few details have been provided regarding
technical considerations for performing in vivo assays. This paper describes, with examples, surgical, experimental design
and analytical issues associated with performing chronic and acute in vivo swine assays to determine As bioavailability in
contaminated soil and food. 相似文献