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81.
针对拉萨市道路交通噪声污染问题,运用人工神经网络理论和方法对拉萨市道路交通噪声的等效连续声级进行预测。经检验,计算值与实测值接近,从而为道路交通噪声的预测提供了一种新的途径。 相似文献
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Summary Reoriented autumn migration of chaffinches and bramblings occurs regularly in southernmost Sweden. The reoriented birds fly in a northeasterrly direction from the coast and inland, i.e. approximately opposite to the normal autumn migration direction. The daily peak of reoriented finch migration, as observed at inland sites 20–40 km from the coast, occurs on average 3.5 h later than the early morning departure in the normal migratory direction, and 1 h later than the peak of migration at the coast. According to trapping data the average weight of reoriented migrants and birds interrupting their migration at the coastline is significantly lower than the weight of migrants proceeding in the normal direction, and the proportion of yearlings seems to be larger in the former category. Censuses of flocks of resting finches showed that they mainly forage at stubble fields of summer rape Brassica napus, preferably fields surrounded by wooded vegetation offering shelter from predator attacks. Preferred food and habitats are mostly located inland, 20 km or more from the coast. These findings are consistent with the interpretation that reorientation constitutes an adaptive response by migrants with small fat reserves. When confronted with an ecological barrier, they return to suitable resting sites for restoring the fat reserves before crossing the barrier. 相似文献
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Lorenz Poellinger Anna Wilhelmsson Johan Lund Jan-ke Gustafsson 《Chemosphere》1986,15(9-12):1681-1686
An assessment of the physicochemical characteristics of the rat hepatic receptors for 2,3,7,8-TCDD and for corticosteroid hormones reveals striking analogies between both receptor systems. 相似文献
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Karin Löfstrand Anna Malmvärn Peter Haglund Anders Bignert Åke Bergman Lillemor Asplund 《Environmental science and pollution research international》2010,17(8):1460-1468
Introduction
Naturally occurring hydroxylated polybrominated diphenyl ethers (OH-PBDEs), their methoxylated counterparts (MeO-PBDEs), and polybrominated dibenzo-p-dioxins (PBDDs), together with their potential precursors polybrominated phenols (PBPs) and polybrominated anisoles (PBAs), were analyzed in blue mussels (Mytilus edulis) gathered along the east coast (bordering the Baltic Sea) and west coast of Sweden (bordering the North Sea). Brown algae (Dictyosiphon foenicolaceus) and cyanobacteria (Nodularia spumigena) from the Baltic Sea, considered to be among the primary producers of these compounds, were also analyzed for comparison. 相似文献88.
利用模糊集理论与分形理论相结合的模糊分维方法 ,处理了山东聊古 1井水氡 1 0多年来的观测资料 ,找出了水氡模糊分维值的 3次较大变化与相应 3次地震的关系。在这 3次地震前水氡模糊分维值都出现明显地小于 0 5 7的低值异常变化。这可能反映了系统在较大地震前的明显降维特征 相似文献
89.
球形红杆菌废水除磷作用的研究 总被引:3,自引:0,他引:3
文章考察了磷源、碳源、硫源对废水生物除磷优势菌球形红杆菌磷代谢的影响,结果表明:在微好氧条件下,缺磷环境会使球形红杆菌产生过量摄磷现象;经无碳和无硫培养后,转移到富磷培养基内,也会产生过量摄磷现象,但随着培养时间的延长,菌体摄磷量下降;该菌体经预培养转入富磷培养基后,碳源不同其摄磷能力有所差异;以苹果酸为碳源时的摄磷量略大于以乙酸源时的摄磷量。 相似文献
90.
We summarize the latest results on the rapid changes that are occurring to Arctic sea ice thickness and extent, the reasons
for them, and the methods being used to monitor the changing ice thickness. Arctic sea ice extent had been shrinking at a
relatively modest rate of 3–4% per decade (annually averaged) but after 1996 this speeded up to 10% per decade and in summer
2007 there was a massive collapse of ice extent to a new record minimum of only 4.1 million km2. Thickness has been falling at a more rapid rate (43% in the 25 years from the early 1970s to late 1990s) with a specially
rapid loss of mass from pressure ridges. The summer 2007 event may have arisen from an interaction between the long-term retreat
and more rapid thinning rates. We review thickness monitoring techniques that show the greatest promise on different spatial
and temporal scales, and for different purposes. We show results from some recent work from submarines, and speculate that
the trends towards retreat and thinning will inevitably lead to an eventual loss of all ice in summer, which can be described
as a ‘tipping point’ in that the former situation, of an Arctic covered with mainly multi-year ice, cannot be retrieved. 相似文献