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1.
Solution-Based Fabrication of Carbon Nanotube Bumps for Flip-Chip Interconnects
Xu Pingye, Fei Tong, Virginia Davis, Minseo Park, Michael Hamilton, 2014, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...Resists, Fabrication, Electrical resistance measurement, Substrates, Dispersion, Resistance, Surface treatment...
Ključne besede: Resists, Fabrication, Electrical resistance measurement, Substrates, Dispersion, Resistance, Surface treatment
Objavljeno: 16.01.2017; Ogledov: 1137; Prenosov: 0
.pdf Polno besedilo (4,51 MB)

2.
A study of pollutant concentration variability in an urban street under low wind speeds
Adrian Dobre, Graham Nickless, Iain R White, Catheryn S Price, Damien Martin, Dudley E Shallcross, 2008, izvirni znanstveni članek

Opis: The short time‐scale variability in pollutant concentrations in an urban street under very low wind speed conditions and short source–receptor distance has been investigated using the inert tracer sulfur hexafluoride (SF6) as a continuous point‐source (release times ≥ 5 min), and fast detection using separation by gas chromatography coupled with a μ‐electron capture detector (ECD). The results are complex but can be broadly interpreted in terms of horizontal wind speed and direction coherence. Comparisons with a simple dispersion model suggest that observed time‐averaged maximum concentrations approach predicted values, whilst instantaneous maximum concentrations vary greatly and would therefore be difficult to predict.
Najdeno v: ključnih besedah
Povzetek najdenega: ...and direction coherence. Comparisons with a simple dispersion model suggest that observed time‐averaged maximum concentrations...
Ključne besede: dispersion, tracer, intermittency
Objavljeno: 17.07.2019; Ogledov: 232; Prenosov: 12
.pdf Polno besedilo (289,67 KB)

3.
CityFlux perfluorocarbon tracer experiments
Fredrik K Petersson, Damien Martin, Iain R White, Stephen J Henshaw, Graham Nickless, Ian Longley, Carl J Percival, Martin Gallagher, Dudley E. Shallcross, 2010, izvirni znanstveni članek

Opis: In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at roof level. One receptor was located on the roof of Portland Tower which is an 80m high building in central Manchester. Source receptor distances in the two experiments varied between 120 and 600 m. The results reveal that maximum concentration was sometimes found at roof level rather than at ground level implying the effectiveness of convective forces on dispersion. The degree of vertical dispersion was found to be dependent on source receptor distance as well as on building height in proximity to the release site. Evidence of flow channelling in a street canyon was also found. Both a Gaussian profile and a street network model were applied and the results show that the urban topography may lead to highly effective flow channelling which therefore may be a very important dispersion mechanism should the right meteorological conditions prevail. The experimental results from this campaign have also been compared with a simple urban dispersion model that was developed during the DAPPLE framework and show good agreement with this. The results presented here are some of the first published regarding vertical dispersion. More tracer experiments are needed in order to further characterise vertical concentration profiles and their dependence on, for instance, atmospheric stability. The impact of urban topography on pollutant dispersion is important to focus on in future tracer experiments in order to improve performance of models as well as for our understanding of the relationship between air quality and public health.
Najdeno v: ključnih besedah
Povzetek najdenega: ...The main aim was to investigate vertical dispersion in an urban area during convective conditions,...
Ključne besede: air quality, atmospheric chemistry, concentration (composition), convective system, dispersion, public health, street canyon, tracer, urban area
Objavljeno: 18.07.2019; Ogledov: 217; Prenosov: 0
.pdf Polno besedilo (1,07 MB)

4.
Urban tracer dispersion experiments during the second DAPPLE field campaign in London 2004
Damien Martin, Catheryn S Price, Iain R White, Graham Nickless, K Fredrik Petersson, Rex E Britter, Alan G Robins, Stephen E Belcher, Janet F Barlow, Marie Neophytou, Samantha J Arnold, Alan S Tomlin, Robert J Smalley, Dudley E. Shallcross, 2010, izvirni znanstveni članek

Opis: As part of the DAPPLE programme two large scale urban tracer experiments using multiple simultaneous releases of cyclic perfluoroalkanes from fixed location point sources was performed. The receptor concentrations along with relevant meteorological parameters measured are compared with a three screening dispersion models in order to best predict the decay of pollution sources with respect to distance. It is shown here that the simple dispersion models tested here can provide a reasonable upper bound estimate of the maximum concentrations measured with an empirical model derived from field observations and wind tunnel studies providing the best estimate. An indoor receptor was also used to assess indoor concentrations and their pertinence to commonly used evacuation procedures.
Najdeno v: ključnih besedah
Ključne besede: Dapple, dispersion
Objavljeno: 18.07.2019; Ogledov: 207; Prenosov: 0
.pdf Polno besedilo (1,69 MB)

5.
Tracer concentration profiles measured in central London as part of the REPARTEE campaign
Damien Martin, K Fredrik Petersson, Iain R White, Stephen H Henshaw, Graham Nickless, Amy Lovelock, Janet F Barlow, Tyrone Dunbar, Curtis R Wood, Dudley E. Shallcross, 2011, izvirni znanstveni članek

Opis: There have been relatively few tracer experiments carried out that have looked at vertical plume spread in urban areas. In this paper we present results from two tracer (cyclic perfluorocarbon) experiments carried out in 2006 and 2007 in central London centred on the BT Tower as part of the REPARTEE (Regent's Park and Tower Environmental Experiment) campaign. The height of the tower gives a unique opportunity to study vertical dispersion profiles and transport times in central London. Vertical gradients are contrasted with the relevant Pasquill stability classes. Estimation of lateral advection and vertical mixing times are made and compared with previous measurements. Data are then compared with a simple operational dispersion model and contrasted with data taken in central London as part of the DAPPLE campaign. This correlates dosage with non-dimensionalised distance from source. Such analyses illustrate the feasibility of the use of these empirical correlations over these prescribed distances in central London.
Najdeno v: ključnih besedah
Povzetek najdenega: ...gives a unique opportunity to study vertical dispersion profiles and transport times in central London....
Ključne besede: advection, concentration (composition), dispersion, tracer, urban atmosphere, vertical mixing, vertical profile
Objavljeno: 18.07.2019; Ogledov: 201; Prenosov: 0
.pdf Polno besedilo (1,49 MB)

6.
A feasibility study of the use of reactive tracers to determine outdoor daytime OH radical concentrations within the urban environment
Iain R White, Damien Martin, K Fredrik Petersson, Stephen J Henshaw, Graham Nickless, Guy C Lloyd-Jones, Kevin C Clemitshaw, Dudley E Shallcross, 2014, izvirni znanstveni članek

Opis: Using a specifically designed chemical tracer to indirectly measure local atmospheric hydroxyl radical (OH) concentrations is a very appealing concept. Such a tracer will provide information on the amount of OH a tracer encounters, as it moves through the urban environment and provide a stringent test of models. However, to date an outdoor experiment such as this has not been conducted. This article discusses the reasons why this is so and examines the feasibility of using tracers to measure integrated urban OH levels over short (≤1km) distances.
Najdeno v: ključnih besedah
Povzetek najdenega: ...tracers, OH radicals, NO3 radicals, oxidising rate, dispersion, urban...
Ključne besede: reactive tracers, OH radicals, NO3 radicals, oxidising rate, dispersion, urban
Objavljeno: 18.07.2019; Ogledov: 212; Prenosov: 0
.pdf Polno besedilo (748,36 KB)

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