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排序方式: 共有117条查询结果,搜索用时 62 毫秒
61.
Stranger M Potgieter-Vermaak S Sacco P Quaglio F Pagani D Cocheo C Godoi AF Van Grieken R 《Environmental monitoring and assessment》2009,149(1-4):411-417
A diffusive sampling method for the determination of gaseous acetic and formic acids, using a radial symmetry diffusive sampler, has been optimised for a 7-day exposure time in this study. Sampling rate determinations were performed on data obtained from a dynamic exposure chamber, simulating the indoor conditions of an empty, closed, room, at room temperature and minimal wind speed. Analysis has been performed by means of ion chromatography. The sampling rates for formic acid concentrations of 128 microg m(-3) and 1248 microg m(-3) were determined to be 91.2 +/- 3.9 ml min(-1) and 111.6 +/- 2.8 ml min(-1), respectively. The acetic acid sampling rate was independent of the concentration in the range 160 microg m(-3)-1564 microg m(-3), and amounted to 97.3 +/- 3.1 ml min(-1). Experimentally determined sampling rates showed deviations of 3% for acetic acid, and 3-21% for formic acid, in relation to theoretically derived values. The blank values were as low as 1.69 +/- 0.07 microg for formic acid and 1.21 +/- 0.14 microg for acetic acid, and detection limits lower than 0.5 microg m(-3) could be achieved, which is an improvement of 98-99% compared to previously validated diffusive sampling methods. This study describes the first step of an extended validation program in which the applicability of these types of samplers for the measurement of organic acids will be validated and optimised for the environmental conditions typical for museum showcases. 相似文献
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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
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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
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