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排序方式: 共有114条查询结果,搜索用时 31 毫秒
61.
Environmental Fluid Mechanics - In the present paper we study buoyant (plume) and non-buoyant (jet) fluid injection in a neutrally stratified uniform cross-flow. Both cases are of practical... 相似文献
62.
The ultimate and proximate causes of natal dispersal have been extensively investigated, but the behaviour of dispersers in
relation to social interactions has been largely neglected. Here, we investigated the social organisation of floating individuals
during their dispersal by analysing the behaviour of 40 radio-tagged eagle owls Bubo bubo during the wandering and stop phases of dispersal. Unexpectedly, eagle owl floaters mixed with conspecifics independently
of their sex, age, phase of dispersal, birthplace, health status and habitat features, showing an ‘underworld’ of interactions
characterised by the absence of obvious social organisation or short-term strategies. Non-breeding owls were not transient
floaters that occurred at numerous sites for short periods of time but rather had fairly stable home ranges: they attempted
to settle as soon as possible within well-defined home ranges. The spatial distribution pattern of floaters and high rates
of home range overlap support the prediction that floating individuals are not spatially segregated, challenging the expectation
that dominance by size, age and/or health status may determine the exclusive use of some portions of the dispersal area. Finally,
(1) the short distances among conspecifics and the extensive home range overlaps allowed us to discard the possibility that
neighbouring floaters represent a real cost during dispersal and (2) floater interactions showed a lack of clear mechanisms
for avoidance of kin competition among offspring or inbreeding. 相似文献
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Marco Ragazzi Paolo Tosi Elena Cristina Rada Vincenzo Torretta Marco Schiavon 《Waste management (New York, N.Y.)》2014,34(11):2400-2406
Mechanical–biological treatments (MBTs) of urban waste are growing in popularity in many European countries. Recent studies pointed out that their contribution in terms of volatile organic compounds (VOCs) and other air pollutants is not negligible. Compared to classical removal technologies, non-thermal plasmas (NTP) showed better performances and low energy consumption when applied to treat lowly concentrated streams. Therefore, to study the feasibility of the application of NTP to MBTs, a Dielectric Barrier Discharge reactor was applied to treat a mixture of air and methyl ethyl ketone (MEK), to simulate emissions from MBTs. The removal efficiency of MEK was linearly dependent upon time, power and specific input energy. Only 2–4% of MEK was converted to carbon dioxide (CO2), the remaining carbon being involved in the formation of byproducts (methyl nitrate and 2,3-butanedione, especially). For future development of pilot-scale reactors, acting on residence time, power, convective flow and catalysts will help finding a compromise between energy consumption, desired abatement and selectivity to CO2. 相似文献
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Rada Elena Cristina Ionescu Gabriela Ferronato Navarro Ragazzi Marco Raspanti Mario Conti Fabio Torretta Vincenzo 《Environmental science and pollution research international》2021,28(42):59076-59082
Environmental Science and Pollution Research - In the present paper, different types of pure and commercial plastic waste from different EU countries (UK, France, Italy, and Romania) were... 相似文献
68.
Vincenzo Torretta Marco Ragazzi Irina Aura Istrate Elena Cristina Rada 《Waste management (New York, N.Y.)》2013,33(1):117-122
The paper presents some data regarding waste electrical and electronic (WEEE) management in one of the founding countries of the EU, Italy, and in a recent entry into the EU, Romania. The aim of this research was to analyze some problems that countries entering the EU will have to solve with respect to WEEE management. The experiences of Italy and Romania could provide an interesting reference point. The strengths and weaknesses that the two EU countries have encountered can be used in order to give a more rational plan for other countries. In Italy the increase of WEEE collection was achieved in parallel with the increase of the efficiency of selective Municipal Solid Waste collection. In Romania, pilot experiences were useful to increase the awareness of the population. The different interests of the two populations towards recyclable waste led to a different scenario: in Romania all types of WEEE have been collected since its entrance into the EU; in Italy the “interest” in recycling is typically related to large household appliances, with a secondary role of lighting equipment. 相似文献
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Paolo Cabras Alberto Angioni Vincenzo L. Garau Marinella Melis Filippo. M. Pirisi Franco Cabitza 《Journal of environmental science and health. Part. B》2013,48(6):1189-1199
Abstract Residues of three pesticides (dimethoate, parathion, and pyrazophos) in two artichoke cultivars, Masedu and Spinoso sardo, were investigated. The amount of pesticides in artichokes was greatly affected by the head shape. In the case of the calix‐shaped Masedu artichoke, the residues in whole heads at commercial ripening were on average about twice higher than those of the pagoda‐shaped Spinoso sardo artichoke. In the heart this ratio was 4 to 42 times greater. Residue decay rates were very fast, mainly owing to the dilution effect due to head growth. 相似文献