Št. zadetkov: 2.448
Izvirni znanstveni članek
Oznake:
dapple;dispersion;
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 scree ...
Leto:
2010
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Video in druga učna gradiva
Oznake:
computer science;machine learning
Infoville XXI is a citizen web portal of Valencia (Spain). This paper presents several approaches based on Machine Learning that help in improving the site. Three ways of improvement are taken into account: (i) user clickstream forecasting, (ii) user profiling by clustering and (iii) recommendation ...
Leto:
2005
Vir:
videolectures.net
Izvirni znanstveni članek
Oznake:
dispersion;tracers;intermittency;
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 usin ...
Leto:
2008
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
rotational line;cavity enhance absorption spectroscopy;adsorbent traps;trace atmospheric constituents;
Continuous wave cavity ring-down spectroscopy (cw-CRDS) coupled with sample pre-concentration has been used to measure acetylene (C2H2) mixing ratios in ambient air. Measurements were made in the near-infrared region (λ∼1535.393 nm), using the P(17) rotational line of the (ν1+ν3) vibrational combina ...
Leto:
2008
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
air quality;atmospheric chemistry;convective system;public health,;
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. Pai ...
Leto:
2010
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
adsorption-desorption system;anthropogenic halocarbons;biogenic halocarbons;electron capture detector;gas chromatography;methyl bromide;
The mixing ratios of 11 C1–C3 halocarbons have been measured using a GC–twin‐linked ECD system over the period from October 2004 to December 2005 at an urban site in Bristol, UK. Time series and seasonal variations of the halocarbons were analysed over the period to determine biogenic and anthropoge ...
Leto:
2009
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
concentration;dispersion;urban atmosphere;
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 ...
Leto:
2011
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
reactive tracers;OH radicals;NO3 radicals;oxidising rate;dispersion;urban;
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 te ...
Leto:
2014
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
ozone;indoor air pollution;indoor ozone;chemical tracers;
The hydroxyl radical (OH) plays a key role in determining indoor air quality. However, its highly reactive nature and low concentration indoors impede direct analysis. This paper describes the techniques used to indirectly quantify indoor OH, including the development of a new method based on the in ...
Leto:
2010
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Dudley E. Shallcross,
D. Martin,
C. S. Price,
Graham Nickless,
I. R. White,
F. K. Petersson,
R. E. Britter,
M. K. Neophytou,
J. E. Tate,
A. S. Tomlin,
S. E. Belcher,
J. F. Barlow,
Alan Robinson
Izvirni znanstveni članek
Oznake:
dapple;perfluorocarbon;tracers;mobile sources;
Four perfluorocarbon tracer dispersion experiments were carried out in central London, United Kingdom in 2004. These experiments were supplementary to the dispersion of air pollution and penetration into the local environment (DAPPLE) campaign and consisted of ground level releases, roof level relea ...
Leto:
2009
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)