The Experts below are selected from a list of 483369 Experts worldwide ranked by ideXlab platform
Sophie Fally - One of the best experts on this subject based on the ideXlab platform.
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fourier transform measurements of so2 absorption cross sections ii temperature dependence in the 29 000 44 000 cm 1 227 345 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Ann Carine Vandaele, Christian Hermans, Sophie FallyAbstract:Abstract This paper is the second of a series that reports results on the measurements of the absorption cross section of SO2 in the UV/visible region at high resolution and that investigates high temperatures in support to planetary applications. Absorption cross sections of SO2 have been obtained in the 29 000–44 000 cm−1 spectral range (227–345 nm) with a Fourier transform spectrometer at a resolution of 2 cm−1 (0.4500 cm MOPD and boxcar apodisation). Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. Temperature effects in this spectral region are investigated and are favorably compared to existing studies in the literature. Comparison of the absorption cross section at room temperature shows good agreement in intensity with most of the literature data, but shows that most of the latter suffer from inaccurate wavelength scale definition. Moreover, literature data are often given only on restricted spectral intervals. Combined with the data described in the first part of this series of papers on SO2, this new data set offers the considerable advantage of covering the large spectral interval extending from 24 000 to 44 000 cm−1 (227–420 nm), at the four temperatures investigated.
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fourier transform measurements of so2 absorption cross sections i temperature dependence in the 24 000 29 000 cm 1 345 420 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Christian Hermans, Ann Carine Vandaele, Sophie FallyAbstract:Absorption cross sections of SO2 have been obtained in the 24 000-29 000 cm � 1 spectral range (345-420 nm) with a Fourier transform spectrometer at a resolution of 2 cm � 1 . Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. This is the first time that temperature effects in this spectral region are reported and investigated. This paper is the first of a series that will report on measurements of the absorption cross section of SO2 in the UV/visible region at a higher than previously reported resolution and that will investigate temperature effects in support of tropospheric, stratospheric and astrophysical or planetary applications.
C A Loto - One of the best experts on this subject based on the ideXlab platform.
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corrosion behaviour of s43035 ferritic stainless steel in hot sulphate chloride solution
Journal of materials research and technology, 2017Co-Authors: Roland Tolulope Loto, C A LotoAbstract:Abstract The corrosion resistance of S43035 ferritic stainless steel at elevated temperatures of 308 K, 328 K, 348 K and 378 K was studied through potentiodynamic polarization test and optical microscopy analysis in 2 M H 2 SO 4 at 0%, 1%, 3.5% and 6% NaCl. Results show that increase in temperature and NaCl generally hinders the formation of the passive film. Changes in corrosion rate from 308 K to 378 K at 0% NaCl was marginal. Metastable pitting was absent until 378 K due to increased electrolytic action of SO 4 2− ions. In the presence of chlorides at 308 K metastable pitting is visible delaying the formation of stable passive film. Passivation behaviour was absent at temperatures above 308 K due to polarization similar to carbon steels and a strong decrease in hydrogen evolution over potential especially at 1% and 3.5% NaCl. Optical images showed mild deterioration at 378 K from 0% NaCl and the formation of corrosion pits at 308 K and 378 K from 6% NaCl. Negative enthalpy value at 0% NaCl implies exothermic nature of the steel corrosion reaction. Addition of chlorides changed the steel corrosion reaction to endothermic. Increase in NaCl concentration caused a decrease in activation energy and increase in entropy values due to decrease in passivation of the alloy and consequently increase in corrosion rate. Statistical analysis through ANOVA at confidence levels of 95% and 97.5% showed the strong influence of temperature variation on corrosion rate with F -values of 5.256 at 50.8% in contrast to the NaCl concentration whose value was below the significance level.
Ann Carine Vandaele - One of the best experts on this subject based on the ideXlab platform.
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fourier transform measurements of so2 absorption cross sections ii temperature dependence in the 29 000 44 000 cm 1 227 345 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Ann Carine Vandaele, Christian Hermans, Sophie FallyAbstract:Abstract This paper is the second of a series that reports results on the measurements of the absorption cross section of SO2 in the UV/visible region at high resolution and that investigates high temperatures in support to planetary applications. Absorption cross sections of SO2 have been obtained in the 29 000–44 000 cm−1 spectral range (227–345 nm) with a Fourier transform spectrometer at a resolution of 2 cm−1 (0.4500 cm MOPD and boxcar apodisation). Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. Temperature effects in this spectral region are investigated and are favorably compared to existing studies in the literature. Comparison of the absorption cross section at room temperature shows good agreement in intensity with most of the literature data, but shows that most of the latter suffer from inaccurate wavelength scale definition. Moreover, literature data are often given only on restricted spectral intervals. Combined with the data described in the first part of this series of papers on SO2, this new data set offers the considerable advantage of covering the large spectral interval extending from 24 000 to 44 000 cm−1 (227–420 nm), at the four temperatures investigated.
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fourier transform measurements of so2 absorption cross sections i temperature dependence in the 24 000 29 000 cm 1 345 420 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Christian Hermans, Ann Carine Vandaele, Sophie FallyAbstract:Absorption cross sections of SO2 have been obtained in the 24 000-29 000 cm � 1 spectral range (345-420 nm) with a Fourier transform spectrometer at a resolution of 2 cm � 1 . Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. This is the first time that temperature effects in this spectral region are reported and investigated. This paper is the first of a series that will report on measurements of the absorption cross section of SO2 in the UV/visible region at a higher than previously reported resolution and that will investigate temperature effects in support of tropospheric, stratospheric and astrophysical or planetary applications.
Christian Hermans - One of the best experts on this subject based on the ideXlab platform.
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fourier transform measurements of so2 absorption cross sections ii temperature dependence in the 29 000 44 000 cm 1 227 345 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Ann Carine Vandaele, Christian Hermans, Sophie FallyAbstract:Abstract This paper is the second of a series that reports results on the measurements of the absorption cross section of SO2 in the UV/visible region at high resolution and that investigates high temperatures in support to planetary applications. Absorption cross sections of SO2 have been obtained in the 29 000–44 000 cm−1 spectral range (227–345 nm) with a Fourier transform spectrometer at a resolution of 2 cm−1 (0.4500 cm MOPD and boxcar apodisation). Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. Temperature effects in this spectral region are investigated and are favorably compared to existing studies in the literature. Comparison of the absorption cross section at room temperature shows good agreement in intensity with most of the literature data, but shows that most of the latter suffer from inaccurate wavelength scale definition. Moreover, literature data are often given only on restricted spectral intervals. Combined with the data described in the first part of this series of papers on SO2, this new data set offers the considerable advantage of covering the large spectral interval extending from 24 000 to 44 000 cm−1 (227–420 nm), at the four temperatures investigated.
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fourier transform measurements of so2 absorption cross sections i temperature dependence in the 24 000 29 000 cm 1 345 420 nm region
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Christian Hermans, Ann Carine Vandaele, Sophie FallyAbstract:Absorption cross sections of SO2 have been obtained in the 24 000-29 000 cm � 1 spectral range (345-420 nm) with a Fourier transform spectrometer at a resolution of 2 cm � 1 . Pure SO2 samples were used and measurements were performed at room temperature (298 K) as well as at 318, 338 and 358 K. This is the first time that temperature effects in this spectral region are reported and investigated. This paper is the first of a series that will report on measurements of the absorption cross section of SO2 in the UV/visible region at a higher than previously reported resolution and that will investigate temperature effects in support of tropospheric, stratospheric and astrophysical or planetary applications.
Michael G. Malkowski - One of the best experts on this subject based on the ideXlab platform.
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The structure of NS-398 bound to cyclooxygenase-2.
Journal of structural biology, 2011Co-Authors: Alex J. Vecchio, Michael G. MalkowskiAbstract:The cyclooxygenases (COX-1 and COX-2) are membrane-associated, heme-containing homodimers that generate prostaglandin H(2) from arachidonic acid (AA) in the committed step of prostaglandin biogenesis and are the targets for nonsteroidal anti-inflammatory drugs (NSAIDs). N-(2-cyclohexyloxy-4-nitrophenyl) methanesulfonamide (NS-398) was the first in a series of isoform-selective drugs designed to preferentially inhibit COX-2, with the aim of ameliorating many of the toxic gastrointestinal side effects caused by conventional NSAID inhibition. We determined the X-ray crystal structure of murine COX-2 in complex with NS-398 utilizing synchrotron radiation to 3.0A resolution. NS-398 binds in the cyclooxygenase channel in a conformation that is different than that observed for other COX-2-selective inhibitors, such as celecoxib, with no discernible penetration into the side pocket formed in COX-2 by the isoform-specific substitutions of I434V, H513R, and I523V. Instead, the methanesulfonamide moiety of NS-398 interacts with the side chain of Arg-120 at the opening of the cyclooxygenase channel, similar to that observed for acidic, nonselective NSAIDs such as indomethacin and flurbiprofen. Our structure validates inhibitor studies that identified Arg-120 as a molecular determinant for time-dependent inhibition of COX-2 by NS-398.
