6 results on '"B. Brient"'
Number of results to display per page
Search Results
2. A new optical sensor for PCO2 measurements in seawater
- Author
-
Jean-Pierre Ciabrini, Liliane Merlivat, M. DuChaffaut, Nathalie Lefèvre, B. Brient, Gil Michard, Laboratoire de géochimie des Eaux (LGE), Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris, Laboratoire d'océanographie dynamique et de climatologie (LODYC), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences de l'Univers (INSU), Institut national des sciences de l'Univers (INSU - CNRS), and Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)
- Subjects
010504 meteorology & atmospheric sciences ,Chemistry ,Calibration curve ,Analytical chemistry ,Context (language use) ,[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] ,General Chemistry ,Thymol blue ,010402 general chemistry ,Oceanography ,01 natural sciences ,0104 chemical sciences ,Absorbance ,chemistry.chemical_compound ,13. Climate action ,Calibration ,Environmental Chemistry ,Seawater ,Fugacity ,14. Life underwater ,Absorption (electromagnetic radiation) ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
A knowledge of the distribution of the partial pressure of CO2 at the surface of the ocean is needed to quantify the absorption of atmospheric CO2 by gas exchange. Owing to the large space and time variability of this quantity at the surface of the ocean, an experimental approach aiming to make time-series measurements from unattended platforms must be envisaged. In this context we have developed a PCO2 sensor which meets the requirements for being installed on a buoy for approximately 1 year. The principle of the sensor is based on a colorimetric method. The selected dye is thymol blue. Its spectra and variation of its pK vs. temperature have been determined. A dedicated optical spectrophotometer has been built making absorbance measurements at three wavelengths. The sensor includes a sensitive volume enclosed with two silicone membranes and filled with thymol blue in an ionic medium. It is related to the spectrophotometer with silica fiber optics. Two calibration experiments were made over a fugacity of CO2 (fCO2) range extending from 340 μatm to 590 μatm. They lasted 3 and 4 days, respectively and showed that in the range 340–600 μatm a variation of ± 1 μatm is seen by the sensor and that the standard error of the fit of the two calibration curves is, respectively, ± 3 μatm and ±5 μatm.
- Published
- 1993
- Full Text
- View/download PDF
3. Interferometric Coupling of the Keck Telescopes with Single-Mode Fibers
- Author
-
Stephen T. Ridgway, F. Dauny, Olivier Guyon, Jean Guerin, J. Gathright, Peter Wizinowich, C. Collin, J. Nishikawa, Francois Rigaut, Katherine C. Roth, M. Hrynevych, D. Ziegler, Guy Perrin, P. Fédou, J. Crétenet, Sébastien Vergnole, Andrew J. Adamson, Laurent Delage, C. Berthod, C. Deléglise, M. Marteaud, B.-T. Melse, Julien Woillez, C. Marlot, Pierre Léna, T. Goeltzenlichter, Takayuki Kotani, D. Le Mignant, Alan T. Tokunaga, B. Brient, R. Hulin, Frederic H. Chaffee, Jean-Michel Reess, Olivier Lai, François Reynaud, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Astronomie du LESIA, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Ingénieurs, Techniciens et Administratifs, W. M. Keck Observatory, Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Institut de Recherche en Communications Optiques et Microondes (IRCOM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), United Kingdom Infra-Red Telescope, Hilo, Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Pôle instrumental, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Subaru Telescope, National Astronomical Observatory of Japan (NAOJ), National Optical Astronomy Observatory, Tucson (NOAO), Gemini Observatory, and Institute for Astronomy, University of Hawaii
- Subjects
Coupling ,Physics ,Multidisciplinary ,Wavelength range ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,Single-mode optical fiber ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Interferometry ,Optics ,Interference (communication) ,Mauna kea ,Observatory ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,business ,Astrophysics::Galaxy Astrophysics - Abstract
Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment demonstrates the potential of fibers for future kilometric arrays of telescopes and is the first step toward the 'OHANA (Optical Hawaiian Array for Nanoradian Astronomy) interferometer at the Mauna Kea observatory in Hawaii. It opens the way to sensitive optical imagers with resolutions below 1 milli‐arc second. Our experimental setup can be directly extended to large telescopes separated by many hundreds of meters.
- Published
- 2006
- Full Text
- View/download PDF
4. A fiber optic probe for spectrophotometric determination of p(CO2) in sea water. Preliminary investigations
- Author
-
B. Brient, Gil Michard, and Jean-Pierre Ciabrini
- Subjects
Geochemistry and Petrology ,Analytical chemistry ,Geology ,Seawater ,A fibers - Published
- 1988
- Full Text
- View/download PDF
5. Interferometric coupling of the Keck telescopes with single-mode fibers.
- Author
-
Perrin G, Woillez J, Lai O, Guérin J, Kotani T, Wizinowich PL, Le Mignant D, Hrynevych M, Gathright J, Léna P, Chaffee F, Vergnole S, Delage L, Reynaud F, Adamson AJ, Berthod C, Brient B, Collin C, Crétenet J, Dauny F, Deléglise C, Fédou P, Goeltzenlichter T, Guyon O, Hulin R, Marlot C, Marteaud M, Melse BT, Nishikawa J, Reess JM, Ridgway ST, Rigaut F, Roth K, Tokunaga AT, and Ziegler D
- Abstract
Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment demonstrates the potential of fibers for future kilometric arrays of telescopes and is the first step toward the 'OHANA (Optical Hawaiian Array for Nanoradian Astronomy) interferometer at the Mauna Kea observatory in Hawaii. It opens the way to sensitive optical imagers with resolutions below 1 milli-arc second. Our experimental setup can be directly extended to large telescopes separated by many hundreds of meters.
- Published
- 2006
- Full Text
- View/download PDF
6. Renal transplantation in children and adolescents.
- Author
-
Fennell RS 3rd, Garin EH, Pfaff W, Brient B, Iravani A, Walker RD, and Richard GA
- Subjects
- Adolescent, Adult, Cadaver, Child, Child, Preschool, Creatinine blood, Cushing Syndrome complications, Female, Follow-Up Studies, Graft Rejection, Graft Survival, Growth Disorders complications, Humans, Male, Postoperative Complications, Quality of Life, Transplantation, Homologous, Kidney Transplantation
- Published
- 1979
- Full Text
- View/download PDF
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.