Institution
University of the Littoral Opal Coast
Education•Dunkirk, France•
About: University of the Littoral Opal Coast is a education organization based out in Dunkirk, France. It is known for research contribution in the topics: Catalysis & Dielectric. The organization has 1242 authors who have published 2383 publications receiving 46230 citations. The organization is also known as: ULCO.
Topics: Catalysis, Dielectric, Liquid crystal, Laser, Population
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors used an off-beam coupled quartz-enhanced photoacoustic spectroscopy (QEPAS) in conjunction with an external cavity quantum cascade laser (EC-QCL) for spectroscopic detection of short-lived gaseous nitrous acid (HONO).
Abstract: Spectroscopic detection of short-lived gaseous nitrous acid (HONO) at 1254.85 cm−1 was realized by off-beam coupled quartz-enhanced photoacoustic spectroscopy (QEPAS) in conjunction with an external cavity quantum cascade lasers (EC-QCL). High sensitivity monitoring of HONO was performed within a very small gas-sample volume (of ∼40 mm3) allowing a significant reduction (of about 4 orders of magnitude) of air sampling residence time which is highly desired for accurate quantification of chemically reactive short-lived species. Calibration of the developed QEPAS-based HONO sensor was carried out by means of lab-generated HONO samples whose concentrations were determined by direct absorption spectroscopy involving a ∼109.5 m multipass cell and a distributed feedback QCL. A minimum detection limit (MDL) of 66 ppbv (1 σ) HONO was achieved at 70 mbar using a laser output power of 50 mW and 1 s integration time, which corresponded to a normalized noise equivalent absorption coefficient of 3.6 × 10−8 cm−1 W/Hz1/2. This MDL was down to 7 ppbv at the optimal integration time of 150 s. The corresponding 1σ minimum detected absorption coefficient is ∼1.1 × 10−7 cm−1 (MDL ∼ 3 ppbv) in 1 s and ∼1.1 × 10−8 cm−1 (MDL ∼ 330 pptv) in 150 s, respectively, with 1 W laser power.
67 citations
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TL;DR: In this paper, an adaptive sampling clock is generated by dual terahertz-comb-referenced spectrum analysers and is used for a timing clock signal in a data acquisition board.
Abstract: Terahertz (THz) dual comb spectroscopy (DCS) is a promising method for high-accuracy, high-resolution, broadband THz spectroscopy because the mode-resolved THz comb spectrum includes both broadband THz radiation and narrow-line CW-THz radiation characteristics. In addition, all frequency modes of a THz comb can be phase-locked to a microwave frequency standard, providing excellent traceability. However, the need for stabilization of dual femtosecond lasers has often hindered its wide use. To overcome this limitation, here we have demonstrated adaptive-sampling THz-DCS, allowing the use of free-running femtosecond lasers. To correct the fluctuation of the time and frequency scales caused by the laser timing jitter, an adaptive sampling clock is generated by dual THz-comb-referenced spectrum analysers and is used for a timing clock signal in a data acquisition board. The results not only indicated the successful implementation of THz-DCS with free-running lasers but also showed that this configuration outperforms standard THz-DCS with stabilized lasers due to the slight jitter remained in the stabilized lasers.
66 citations
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TL;DR: In this article, the authors show that from a methodological and theoretical perspective, 'The Lighthouse' is consistent with 'The Problem of Social Cost' (Coase, R. H. 1989), and apply Coase's own method (historical case studies) to re-examine the respective roles and efficiencies of private initiative and government.
Abstract: In 'The Lighthouse in Economics' (Coase, R. H. Journal of Law and Economics, vol. 17, no. 2, 357-76, 1974), Coase reached the conclusion that in England there existed a relatively efficient privately financed lighthouse system, which would refute economists' traditional statements concerning the production of public goods. The purpose of this paper is to challenge his conclusion. We first show that, from a methodological and theoretical perspective, 'The Lighthouse' is consistent with 'The Problem of Social Cost' (Coase, R. H. Journal of Law and Economics, vol. 3, 1-44, 1960). Then, applying Coase's own method (historical case studies), we attempt to re-examine the respective roles and efficiencies of private initiative and government.
66 citations
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TL;DR: In this paper, the distribution of these populations among the four sub-environments reflects tide-and storm-dominated sorting and transport processes and a variable degree of mixing, and they are derived from a mixture of very fine-to very coarse-grained fluvial, outwash and paraglacial sediments deposited on the beds of the eastern English Channel and southern North Sea during the late Pleistocene lowstand.
66 citations
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TL;DR: The structure of the extracellular and cell wall teichoic acids of the Staphylococcus aureus MN8m strain was studied by NMR spectroscopy and capillary electrophoresis-mass spectrometry and found to be a mixture of two polymers.
66 citations
Authors
Showing all 1273 results
Name | H-index | Papers | Citations |
---|---|---|---|
Tong Wu | 66 | 591 | 19325 |
Bernard Coq | 50 | 148 | 7111 |
Antoine Aboukaïs | 43 | 218 | 6290 |
Karine Anselme | 43 | 139 | 9671 |
Edward J. Anthony | 43 | 215 | 5659 |
Pierre Collet | 41 | 322 | 7871 |
Jean-François Lamonier | 41 | 141 | 4625 |
Serge Berthoin | 41 | 140 | 6291 |
Jean Demaison | 39 | 409 | 6858 |
Guillaume Garçon | 39 | 102 | 3692 |
Pierre Hardouin | 38 | 93 | 6145 |
Sami Souissi | 38 | 197 | 8837 |
John C. Wenger | 37 | 112 | 6644 |
François G. Schmitt | 37 | 189 | 4953 |
Pirouz Shirali | 37 | 86 | 3253 |