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排序方式: 共有215条查询结果,搜索用时 625 毫秒
181.
Gregor Kalinkat Juliano S. Cabral William Darwall G. Francesco Ficetola Judith L. Fisher Darren P. Giling Marie‐Pierre Gosselin Hans‐Peter Grossart Sonja C. Jähnig Jonathan M. Jeschke Klaus Knopf Stefano Larsen Gabriela Onandia Marlene Pätzig Wolf‐Christian Saul Gabriel Singer Erik Sperfeld Ivan Jarić 《Conservation biology》2017,31(2):481-485
182.
183.
Paíga Paula Sousa Sara Vera José Bitencourt Luciana Vieira Joana Jorge Sandra Silva Jaime Gabriel Correia Manuela Domingues Valentina F. Delerue-Matos Cristina 《Environmental science and pollution research international》2021,28(47):66787-66803
Environmental Science and Pollution Research - Three sampling campaigns were performed in the Lis River (Leiria, Portugal) in February of 2018, November of 2018, and May of 2019. River water and... 相似文献
184.
López Gabriela Riviello Martinez Leila Marina Freyre Laura Freire María Cecilia Vladimirsky Sara Rabossi Alejandro Cisterna Daniel Marcelo 《Food and environmental virology》2021,13(1):64-73
Food and Environmental Virology - Cosaviruses (CoSV) and Saffold cardiovirus (SAFV) are novel members of the Picornaviridae family. The Matanza-Riachuelo river basin covers a total area of 2200 km2... 相似文献
185.
Witold Gądor Elżbieta Jankowska 《International journal of occupational safety and ergonomics》2013,19(3):361-379
AbstractThis paper presents the results and conclusions from experimental investigations concerning filtration properties of nonwovens. The needled nonwovens were made from polyester fibres (PTE) with average fibre diameter 12 µm and polypropylene fibres (PP) with average fibre diameter 32 μm. Nonwovens were produced out of each of those fibres or out of a mixture of polyester and polypropylene fibres. This paper also presents investigations of nonwoven fabric made of polypropylene fibres (PP) with average fibre diameter 2.6 μm, which was formed according to melt-blown technology. Oil mist, as challenge aerosol, was used to evaluate the performance of filter media at various aerosol velocities. The average oil mist test aerosol particle diameter was 0.3 μm. Filter penetration was measured at oil mist concentration 0.24 g/m3. 相似文献
186.
Portable chainsaws are associated with substantial risk and can cause serious injury to operators, especially during kickback. This paper presents new results from research and analyses conducted regarding the impact between the different properties of wood on this occurrence. In an open area, such differences may include: wood species, humidity, temperature and the facing angle of the wood fibres in relation to the kerf and shape of the wood surface that comes in contact with the tip of the guide bar. This paper investigates chainsaw kickback including the research results on kickback and wood-cutting energy, saw chain speed and the efficiency of the chainsaw engine. It also presents conclusions drawn from the tests that can be useful for chainsaw users, showing the dependencies between the different properties of wood and the risk of injury. 相似文献
187.
Samples of small rodent populations inhabiting Crabapple Island on Beldany Lake in NE Poland revealed that Clethrionomys glareolus was continously present there, whereas Apodemus flavicollis and Microtus agrestis appeared, stayed for some period, vanished and reappeared. It appears that sexually mature females of the bank vole are strictly territorial, their numbers are limited, and immature individuals hardly disperse at high population size. Sexually mature females of the yellow-necked mouse seem to be territorial only at low population numbers, and their numbers increase linearly with population size. Sexually mature females of the field vole exhibit high level of aggregation, and their numbers increase in streight line with growing population size. We discuss the idea that different social organization of the rodent populations is connected with various strategies (sedentary and nomadic) supporting local population persistence. 相似文献
188.
Mariusz Dąbrowski Jarosław Górski 《International journal of occupational safety and ergonomics》2019,25(2):278-286
One of the most serious causes of accidents in furniture making is kickback of machined material. The aim of this study was to determine the influence of the milling tool setup on hazards associated with kickback in furniture making. The speed of kickback was accepted as the measure of these hazards. The experiment involved controlled changes in milling tool setup, projection of cutting knives over the body of the milling tool, number of cutting knives and clearance angle. Multifactor analysis of variance was applied to the results of individual experiments, showing statistically significant factors and their interactions. Inspection and analysis of traces left by the cutting knives of the tools on the test pieces made of wood materials supported inferential statistics. The obtained results verified some common opinions and ideas on the impact of the milling tool setup on the hazards resulting from kickback in furniture making. 相似文献
189.
A territorial male can shift the location of its territory from year to year in order to increase its quality. The male can
base its decision on environmental cues or else on its breeding experiences (when territory shift is caused by breeding failure
in previous seasons). We tested these possible mechanisms of territory choice in the sedge warbler (Acrocephalus schoenobaenus), a territorial migrating passerine that occupies wetlands. This species bases its territory choices on an environmental
cue: tall wetland vegetation cover. We found that the magnitude of territory quality improvement between seasons (measured
as the area of tall wetland vegetation) increased throughout the early stages of a male's breeding career as a result of territory
shifts dependent on the earliness of arrival. The distance the territory was shifted between seasons depended negatively on
the previous year's territory quality and, less clearly, on the previous year's mating success. On the other hand, previous
mating or nesting success had no influence on territory quality improvement between seasons as measured in terms of vegetation.
The results imply that tall wetland vegetation is a long-term, effective environmental cue and that a preference for territories
in which this type of landcover prevails has evolved into a rigid behavioral mechanism, supplemented by short-term individual
experiences of breeding failure. 相似文献
190.
Isabel Hilber Gabriela S. Wyss Paul Mäder Thomas D. Bucheli Isabel Meier Lea Vogt Rainer Schulin 《Environmental pollution (Barking, Essex : 1987)》2009,157(8-9):2224-2230
Activated charcoal (AC) amendments have been suggested as a promising, cost-effective method to immobilize organic contaminants in soil. We performed pot experiments over two years with cucumber (Cucumis sativus L.) grown in agricultural soil with 0.07 mg kg?1 of weathered dieldrin and 0, 200, 400, and 800 mg AC per kg soil. Dieldrin fresh weight concentrations in cucumber fruits were significantly reduced from 0.012 to an average of 0.004 mg kg?1, and total uptake from 2 to 1 μg in the 800 mg kg?1 AC treatment compared to the untreated soil. The treatment effects differed considerably between the two years, due to different meteorological conditions. AC soil treatments did neither affect the availability of nutrients to the cucumber plants nor their yield (total fruit wet weight per pot). Thus, some important prerequisites for the successful application of AC amendments to immobilize organic pollutants in agricultural soils can be considered fulfilled. 相似文献