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201.
202.
Johannes Methfessel 《Die Naturwissenschaften》1957,44(11):329-329
203.
204.
Erik Meers Pieter Vervaeke Filip M.G. Tack Noel Lust Marc Verloo Els Lesage 《补救:环境净化治理成本、技术与工艺杂志》2003,13(3):87-97
Remediation of heavy metal contamination in soil is a widespread environmental issue. Conventional remediation techniques are invasive and often too expensive, particularly if large areas of soil are contaminated. Phytoremediation is the use of plants to remediate soil and groundwater. Phytoremediation of inorganic comtaminants such as metals can be further catagorized into phytostabilization and phytoextraction. These techniques have gained an increasing amount of attention and research over the last ten years. Phytoextraction of heavy metals and periodical removal of harvestable plant parts results in a gradual decrease of pollutant levels in the top soil. Woody species such as Salix sp. (willow) do not represent the fastest phytoextraction procedure compared to uptake by herbaceous species; however, they offer the added advantage of possible reuse of the produced biomass (wood) for the production of renewable energy. Here we present the results of a field experiment conducted to evaluate the use of Salix to remediate soil contaminated with cadmium and zinc at a dredged sediment disposal site in Flanders, Belgium. © 2003 Wiley Periodicals, Inc. 相似文献
205.
The recycling sector in India, which consists of a comprehensive trade and production sector, is rather complex. Nevertheless, it creates important benefits for both the economy and the environment. In order to comprehend the system, a case study has been performed on the recycling sector (paper, plastic, glass and non-ferrous metal) in Bangalore (India), focussing on the market structure, the scale of operation, employment effects, constraints, and recent developments. It was found that this highly competitive and labour-intensive industry is largely dependent on cheap labour and the supply of solid waste from the local trade system. Its mostly informal nature results from the ‘unregisteredness’ of the materials. Consequently, government involvement is avoided as much as possible. With present growth rates, prospects of recycling in Bangalore are advancing. Yet, problems such as lack of supply and loss of quality emerge. Therefore, quality control and market conditions should be improved. 相似文献
206.
This paper discusses the major developments in regional policy in the Netherlands by relating the policy instruments and locations to stages in the socio‐economic and political development of the Netherlands from 1945 onwards. It concludes that, at present, the spatial dimension of economic policy has lost importance, and the support for peripheral regions is restricted. 相似文献
207.
Hanneke Kruize Peter P. J. Driessen Pieter Glasbergen Klaas Van Egmond Ton Dassen 《Journal of Environmental Planning and Management》2007,50(6):699-726
This paper examines the impact of the interplay between market forces and government policy on environmental equity in the vicinity of Amsterdam Airport in the Netherlands. Despite pressure on space and the presence of the international airport, exposure to the higher levels of traffic noise, NO2 and external safety risks, and accumulation of traffic noise and NO2 (‘bads’) was rather limited and generally distributed fairly equally among income categories, probably as a result of environmental regulations. However, lower-income categories had less access to lower levels of traffic noise, NO2 and public green space (‘goods’) than higher-income categories, which may be explained by both historical processes and market forces. Policy makers seem to accept a higher environmental burden on the regional population because of the benefits for the national economy generated by Amsterdam Airport. 相似文献
208.
Tobias Weil Katharina Hoffmann Johannes Kroiss Erhard Strohm Judith Korb 《Die Naturwissenschaften》2009,96(2):315-319
In social insects, it is assumed that signals of the queen inform nestmates about her reproductive status. Thus, workers forego
their own reproduction if the queen signals high fertility. In hemimetabolous termites, little is known about reproductive
inhibition, but evidence exists for a royal-pair control. Workers of lower termites exhibit a high developmental flexibility
and are potentially able to become reproductives, but the presence of a fertile reproductive restrains them from reaching
sexual maturity. The nature of this control, however, remains unknown. Here, we report on qualitative differences in cuticular
hydrocarbon profiles between queens and workers of the basal drywood termite Cryptotermes secundus. Queens were characterized by a shift to long-chained and branched hydrocarbons. Most remarkably, similar chemical patterns
are regarded as fertility cues of reproductives in social Hymenoptera. This might suggest that both groups of social insects
convergently evolved similar chemical signatures. The present study provides deeper insights into how termites might have
socially exploited these signatures from sexual communication in their cockroach-like ancestor.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
209.
High bat (Chiroptera) diversity in the Early Eocene of India 总被引:1,自引:0,他引:1
Smith T Rana RS Missiaen P Rose KD Sahni A Singh H Singh L 《Die Naturwissenschaften》2007,94(12):1003-1009
The geographic origin of bats is still unknown, and fossils of earliest bats are rare and poorly diversified, with, maybe,
the exception of Europe. The earliest bats are recorded from the Early Eocene of North America, Europe, North Africa and Australia
where they seem to appear suddenly and simultaneously. Until now, the oldest record in Asia was from the Middle Eocene. In
this paper, we report the discovery of the oldest bat fauna of Asia dating from the Early Eocene of the Cambay Formation at
Vastan Lignite Mine in Western India. The fossil taxa are described on the basis of well-preserved fragments of dentaries
and lower teeth. The fauna is highly diversified and is represented by seven species belonging to seven genera and at least
four families. Two genera and five species are new. Three species exhibit very primitive dental characters, whereas four others
indicate more advanced states. Unexpectedly, this fauna presents strong affinities with the European faunas from the French
Paris Basin and the German Messel locality. This could result from the limited fossil record of bats in Asia, but could also
suggest new palaeobiogeographic scenarios involving the relative position of India during the Early Eocene. 相似文献