2,222 research outputs found
Correction to 'Radiation belt electron precipitation into the atmosphere: recovery from a geomagnetic storm'
No full textInternational audienceCorrection to “Radiation belt electron precipitation intothe atmosphere: Recovery from a geomagnetic storm”Craig J. Rodger, Mark A. Clilverd, Neil R. Thomson, Rory J. Gamble, Annika Seppälä,Esa Turunen, Nigel P. Meredith, Michel Parrot, Jean‐André Sauvaud,and Jean‐Jacques BerthelierReceived 17 August 2010; accepted 19 August 2010; published 25 September 2010.Citation: Rodger, C. J., M. A. Clilverd, N. R. Thomson, R. J. Gamble, A. Seppälä, E. Turunen, N. P. Meredith, M. Parrot, J.‐A.Sauvaud, and J.‐J. Berthelier (2010), Correction to “Radiation belt electron precipitation into the atmosphere: Recovery from ageomagnetic storm,” J. Geophys. Res., 115, A09324, doi:10.1029/2010JA016038
Carbon and Hydrogen Isotope Fractionation of Benzene, Toluene, and o -Xylene during Chemical Oxidation by Persulfate
No full textExperiments were performed to investigate the carbon and hydrogen isotope fractionation of benzene, toluene, and o -xylene (BTX) during
chemical oxidation by unactivated persulfate at two concentrations (8 and 20 g/L). Carbon enrichment ( e
C
) values of −1.7 ± 0.1‰ for benzene,
−0.64 ± 0.1‰ for toluene and −0.36 ± 0.04‰ for o -xylene were obtained. No significant hydrogen enrichment ( e
H
) was observed for benzene,
while the hydrogen enrichment for toluene and o -xylene were −20 ± 3‰ and −23 ± 2‰, respectively. The dual isotope plot ( ∆ δ
13
C vs. ∆ δ
2
H) for
benzene and o -xylene revealed a distinct fractionation trend compared to the majority of the biodegradation data compiled from the literature;
however, no unique trend was observed for toluene. The significant carbon and/or hydrogen enrichment, and the distinct trend observed on the
dual isotope plot suggest that compound specific isotope analysis (CSIA) can potentially be used to monitor the chemical oxidation of BTX by
persulfate, and to distinguish treatment areas where persulfate or biodegradation reactions are occurring for benzene and o -xylene
Carbon isotope fractionation of chlorinated ethenes during oxidation by Fe 2+ activated persulfate
No full textThe increased use of persulfate (S 2O 82-) for in situ chemical oxidation to treat groundwater and soils contaminated by chlorinated hydrocarbon compounds (CHCs) requires unbiased methods to assess treatment performance. Stable carbon isotope analysis offers a potential tool for assessing the in situ treatment performance of persulfate at sites contaminated with CHCs. This study investigated the extent of C isotope fractionation during oxidation of tetrachloroethene (PCE), trichloroethene (TCE) and cis-dichloroethene (cis-DCE) by persulfate activated by ferrous ion (Fe 2+). An average carbon isotope enrichment factor ε bulk of -4.9‰ for PCE, -3.6‰ for TCE and -7.6‰ for cis-DCE were obtained in batch experiments. Variations in the initial S 2O 82-/Fe 2+/CHC molar ratios did not result in any significant differences in carbon isotope fractionation. The occurrence of carbon isotope fractionation during oxidation and the lack of dependence of enrichment factors upon the S 2O 82-/Fe 2+/CHC molar ratio demonstrate that carbon isotope analysis can potentially be used at contaminated sites as an additional technique to estimate treatment efficacy during oxidation of CHCs by Fe 2+ activated persulfate. © 2012 Elsevier B.V
Carbon isotope fractionation of 1,1,1-trichloroethane during base-catalyzed persulfate treatment
No full textThe extent of carbon isotope fractionation during degradation of 1,1,1-trichloroethane (1,1,1-TCA) by a base-catalyzed persulfate (S2O82-) treatment system was investigated. Significant destruction of 1,1,1-TCA was observed at a pH of ~12. An increase in the NaOH:S2O82-molar ratio from 0.2:1 to 8:1 enhanced the reaction rate of 1,1,1-TCA by a factor of ̃5 to yield complete (>99.9%) destruction. An average carbon isotope enrichment fractionation factor which was independent of the NaOH:S2O82-molar ratio of -7.0±0.2‰ was obtained. This significant carbon isotope fractionation and the lack of dependence on changes in the NaOH:S2O82-molar ratio demonstrates that carbon isotope analysis can potentially be used in situ as a performance assessment tool to estimate the degradation effectiveness of 1,1,1-TCA by a base-catalyzed persulfate system. © 2013 Elsevier B.V
The Seasons / By James Thomson
No full textVorlageform des Erscheinungsvermerks: Leipzig Printed For John Sommer MDCCXCIV.Frontisp
Chrysis brevitarsis Thomson 1870
No full textChrysis brevitarsis THOMSON,1870 Chrysis brevitarsis THOMSON, 1870: 107. Holotype ♀; Sweden: Nerike [= Närke] (Lund). Chrysis brevitarsis: VAN DER SMISSEN 2010: 33 (key), 52 (descr., var. 1 and var. 2: Kazakhstan: Koniptau Mts., 100 km NW Taldi-Kurgan [= Taldykorgan]; 200 km NE Tcherkaskoe; var. 3: Kazakhstan: Issik 3 km S; Kyrgyzstan, env. Frunze [= Bishkek], 10 km Con Arik, 10 km W Taldi-Suu, 42,9° N 78,0° E (Issik-Kul); Tash-Arik, 11 km E Talas; Ala-Archa riv., Kashka- Suu, 1700m. Uzbekistan: Sukok). R e m a r k s: identification by VAN DER SMISSEN (2010) to be confirmed. The author listed three colour variations, without any mention to other characters. However, several similar blue species are distributed in Central Asia and another examination of those specimens is needed. D i s t r i b u t i o n: Kazakhstan, Kyrgyzstan, Uzbekistan.Published as part of Rosa, Paolo, 2019, A new remarkable species in the Chrysis ignita group (Hymenoptera, Chrysididae) and an overview on Central Asian species, with new synonymies, pp. 397-417 in Linzer biologische Beiträge 51 (1) on page 405, DOI: 10.5281/zenodo.375837
On a Mechanical Representation of Electric, Magnetic and Galvanic Forces, by William Thomson: a commented reading
No full textWe present and comment the homonimous article originally published by William Thomson, in 1847, in which the author explores the analogy between the estates of deformation in an elastic solid and the configurations of Faraday's lines of force. In this article Thomson has introduced for the first time the magnetic potential vector, associated in this context with rotational deformations in the solid. We present as well, the historical context in which Thomson's original paper has been conceived.Apresentamos e comentamos o artigo homônimo de William Thomson, originalmente publicado em 1847, no qual o autor explora a analogia entre os estados de deformação em um sólido elástico e as configurações das linhas de força de Faraday. Nele Thomson introduz pela primeira vez o potencial vetorial magnético, associando-o à deformação rotacional de um sólido. Apresentamos também um apanhado histórico do contexto dentro do qual o original de Thomson foi concebido
Author reply to Hettiarachchi et al. (re Helicobacter pylori resistance in Australia…)
No full textLetter to the EditorJonathon P. Schubert, Paul R. Ingram, Morgyn S. Warner, Christopher K. Rayner, Ian C. Roberts-Thomson, Samuel P. Costello and Robert V. Bryan
(R)-salbutamol in the treatment of asthma and chronic obstructive airways disease
No full textAreas covered: In this review the authors show that (R)-salbutamol alone (generically known as levosalbutamol) provides beneficial beta beta(2)-agonist effects at a cellular level and in experimental models of airways disease. In addition the authors demonstrate that (S)-salbutamol opposes the desirable effects of (R)-salbutamol and can actually cause features of asthma and COPD in vitro and in experimental asthma. Expert opinion: Despite this strong body of experimental evidence, (R)-salbutamol has not shown consistent superiority over (S)- or racemic salbutamol in human asthma or COP
The generous Free-mason: or, the constant lady. With the humours of Squire Noodle, and his man Doodle. A tragi-comi-farcical ballad opera. In three acts. With the musick prefix'd to each song. By the author of The lover's opera:
No full text[4],51,[1]p., : music ; 8⁰.Author of The lover's opera = W. R. Chetwood.Reproduction of original from the British Library.English Short Title Catalog, ESTCT1755.Electronic data. Farmington Hills, Mich. : Thomson Gale, 2003. Page image (PNG). Digitized image of the microfilm version produced in Woodbridge, CT by Research Publications, 1982-2002 (later known as Primary Source Microfilm, an imprint of the Gale Group)
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