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71.
A study of pollutant concentration variability in an urban street under low wind speeds
Damien Martin, Catheryn S Price, Iain R. White, Graham Nickless, Adrian Dobre, 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.
Ključne besede: dispersion, tracer, intermittency
Objavljeno v RUNG: 17.07.2019; Ogledov: 2985; Prenosov: 128
.pdf Celotno besedilo (289,67 KB)

72.
Evaluation of VOC denuder efficiency and positive artefactdue to denuder breakthrough using TCA08
Asta Gregorič, Gašper Lavrič, Martin Rigler, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: VOC denuder, TCA08, sampling artefact
Objavljeno v RUNG: 17.07.2019; Ogledov: 3126; Prenosov: 0
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73.
Trace detection of C2H2 in ambient air using continuous wave cavity ring-down spectroscopy combined with sample pre-concentration
Manik Pradhan, Ruth Lindley, Roberto Grilli, Iain R. White, Damien Martin, Orr-Ewing Andrew, 2008, izvirni znanstveni članek

Opis: 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 combination band, a region free from interference by overlapping spectral absorption features of other air constituents. The spectrometer is shown to be capable of fast, quantitative and precise C2H2 mixing ratio determinations without the need for gas chromatographic (GC) separation. The current detection limit of the spectrometer following sample pre-concentration is estimated to be 35 parts per trillion by volume (pptv), which is sufficient for direct atmospheric detection of C2H2 at concentrations typical of both urban and rural environments. The CRDS apparatus performance was compared with an instrument using GC separation and flame ionization detection (GC-FID); both techniques were used to analyze air samples collected within and outside the laboratory. These measurements were shown to be in quantitative agreement. The indoor air sample was found to contain C2H2 at a mixing ratio of 3.87±0.22 ppbv (3.90±0.23 ppbv by GC-FID), and the C2H2 fractions in the outside air samples collected on two separate days from urban locations were 1.83±0.20 and 0.69±0.14 ppbv (1.18±0.09 and 0.60±0.04 ppbv by GC-FID). The discrepancy in the first outdoor air sample is attributed to degradation over a 2-month interval between the cw-CRDS and GC-FID analyses.
Ključne besede: Rotational Line, Cavity Enhance Absorption Spectroscopy, Adsorbent Trap, Trace Atmospheric Constituent, CRDS Instrument
Objavljeno v RUNG: 15.07.2019; Ogledov: 3160; Prenosov: 0
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Paramagnetic centers in amorphous GeO2
Luigi Giacomazzi, Layla Martin-Samos, Nicolas Richard, 2015, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: Ge-E' centers, first-principles, EPR, GeO2
Objavljeno v RUNG: 25.10.2018; Ogledov: 3386; Prenosov: 0
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77.
Radiation Effects on Optical Fibers and Fiber-Based Sensors
Sylvain Girard, A. Boukenter, Youcef Ouerdane, Nicolas Richard, Philippe Paillet, Layla Martin-Samos, Luigi Giacomazzi, Claude Marcandella, 2015, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Ključne besede: Optical Fibers, radiation-induced point defects, dosimetry, ab-initio
Objavljeno v RUNG: 24.10.2018; Ogledov: 3613; Prenosov: 0
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78.
Radiation induced color centers in Silica: a first-principles investigation.
Luigi Giacomazzi, Layla Martin-Samos, Nicolas Richard, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: Silica, EPR, E' centers, ODC
Objavljeno v RUNG: 22.10.2018; Ogledov: 4065; Prenosov: 0
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79.
Paramagnetic H-related defects in silica: a first-principles investigation
Luigi Giacomazzi, Layla Martin-Samos, Nicolas Richard, 2016, objavljeni znanstveni prispevek na konferenci

Ključne besede: silica, EPR, E'beta, first-principles, hydrogen related defects
Objavljeno v RUNG: 16.10.2018; Ogledov: 3619; Prenosov: 0
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80.
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