Institution
Rensselaer Polytechnic Institute
Education•Troy, New York, United States•
About: Rensselaer Polytechnic Institute is a education organization based out in Troy, New York, United States. It is known for research contribution in the topics: Terahertz radiation & Finite element method. The organization has 19024 authors who have published 39922 publications receiving 1414699 citations. The organization is also known as: RPI & Rensselaer Institute.
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TL;DR: In this article, the spectral properties of CO2-ice absorption features at a resolving power of lambda/Delta lambda approximate to 1500-2000 are presented for 14 lines of sight with the ShortWavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO).
Abstract: Spectra of interstellar CO2 ice absorption features at a resolving power of lambda/Delta lambda approximate to 1500-2000 are presented for 14 lines of sight. The observations were made with the Short-Wavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO). Spectral coverage includes the primary stretching mode of CO2 near 4.27 mu m in all sources; the bending mode near 15.2 mu m is also detected in 12 of them. The selected sources include massive protostars (Elias 29 [in rho Oph], GL 490, GL 2136, GL 2591, GL 4176, NGC 7538 IRS 1, NCC 7538 IRS 9, S140, W3 IRS 5, and W33 A), sources associated with the Galactic Center (Sgr A*, GCS 3 I, and GCS 4), and a background star behind a quiescent dark cloud in Taurus (Elias 16); they thus probe a diverse range of environments. Column densities of interstellar CO2 ice relative to H2O ice fall in the range 10%-23%: this ratio displays remarkably little variation for such a physically diverse sample. Comparison of the observed profiles with laboratory data for CO2-bearing ice mixtures indicates that CO2 generally exists in at least two phases, one polar (H2O dominant) and one nonpolar (CO2 dominant). The observed CO2 profiles may also be reproduced when the nonpolar components are replaced with thermally annealed ices. Formation and evolutionary scenarios for CO2 and implications for grain mantle chemistry are discussed. Our results support the conclusion that thermal annealing, rather than energetic processing due to UV photons or cosmic rays, dominates the evolution of CO2-bearing ices.
292 citations
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TL;DR: Comparison of the rates of chromate reduction by chromate grown cells and cells grown without chromate indicated that the chromate reductase activity is constitutive, and studies with cell-free extracts show that the reduct enzyme is membrane-associated and can mediate the transfer of electrons from NADH to chromate.
Abstract: Pseudomonas fluorescens LB300 is a chromateresistant strain isolated from chromium-contaminated river sediment Chromate resistance is conferred by the plasmid pLHB1 Strain LB300 grew in minimal salts medium with as much as 1000 μg of K2CrO4 ml−1, and actively reduced chromate to Cr(III) while growing aerobically on a variety of substrates Chromate was also reduced during anaerobic growth on acetate, the chromate serving as terminal electron acceptor P fluorescens LB303, a plasmidless, chromatesensitive variant of P fluorescens LB300, did not grow in minimal salts medium with more than 10 μg of K2CrO4 ml−1 However, resting cells of strain LB303 grown without chromate reduced chromate as well as strain LB300 cells grown under the same conditions Furthermore, resting cells of chromate-sensitive Pseudomonas putida strain AC10, also catalyzed chromate reduction Evidently chromate resistance and chromate reduction in these organisms are unrelated Comparison of the rates of chromate reduction by chromate grown cells and cells grown without chromate indicated that the chromate reductase activity is constitutive Studies with cell-free extracts show that the reductase is membrane-associated and can mediate the transfer of electrons from NADH to chromate
292 citations
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TL;DR: Synthese et distribution de HCN: obtention de nitriles ou de liants oligomeres, role possible des composes cyano comme agents de condensation.
292 citations
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TL;DR: Estimates for the 1990s show a much more rapid decline than other global studies, reflecting the view that technological progress in reducing sulfur based pollution has been rapid and is beginning to diffuse worldwide.
291 citations
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Pennsylvania State University1, York University2, Princeton University3, University of Washington4, University of Arizona5, Fermilab6, Adler Planetarium7, University of Chicago8, New Mexico State University9, New York University10, University of Illinois at Urbana–Champaign11, Eötvös Loránd University12, University of Tokyo13, Microsoft14, Johns Hopkins University15, Pedagogical University16, University of Sussex17, Space Telescope Science Institute18, United States Department of the Navy19, Rensselaer Polytechnic Institute20, University of Portsmouth21, University of California, Santa Cruz22, Lawrence Berkeley National Laboratory23, Carnegie Institution for Science24, Max Planck Society25
TL;DR: The third edition of the Sloan Digital Sky Survey (SDSS) Quasar catalog as discussed by the authors contains 46,420 objects in the SDSS Third Data Release that have luminosities larger than Mi = -22 (in a cosmology with H0 = 70 km s-1 Mpc-1, ΩM = 0.3, and ΩΛ =0.7), have at least one emission line with FWHM larger than 1000 km-s-1 or are unambiguously broad absorption line quasars, are fainter than
Abstract: We present the third edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog consists of the 46,420 objects in the SDSS Third Data Release that have luminosities larger than Mi = -22 (in a cosmology with H0 = 70 km s-1 Mpc-1, ΩM = 0.3, and ΩΛ = 0.7), have at least one emission line with FWHM larger than 1000 km s-1 or are unambiguously broad absorption line quasars, are fainter than i = 15.0, and have highly reliable redshifts. The area covered by the catalog is ≈4188 deg2. The quasar redshifts range from 0.08 to 5.41, with a median value of 1.47; the high-redshift sample includes 520 quasars at redshifts greater than 4, of which 17 are at redshifts greater than 5. For each object the catalog presents positions accurate to better than 02 rms per coordinate, five-band (ugriz) CCD-based photometry with typical accuracy of 0.03 mag, and information on the morphology and selection method. The catalog also contains radio, near-infrared, and X-ray emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra cover the wavelength region 3800–9200 A at a spectral resolution of 2000; the spectra can be retrieved from the public database using the information provided in the catalog. A total of 44,221 objects in the catalog were discovered by the SDSS; 28,400 of the SDSS discoveries are reported here for the first time.
291 citations
Authors
Showing all 19133 results
Name | H-index | Papers | Citations |
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Pulickel M. Ajayan | 176 | 1223 | 136241 |
Zhenan Bao | 169 | 865 | 106571 |
Murray F. Brennan | 161 | 925 | 97087 |
Ashok Kumar | 151 | 5654 | 164086 |
Joseph R. Ecker | 148 | 381 | 94860 |
Bruce E. Logan | 140 | 591 | 77351 |
Shih-Fu Chang | 130 | 917 | 72346 |
Michael G. Rossmann | 121 | 594 | 53409 |
Richard P. Van Duyne | 116 | 409 | 79671 |
Michael Lynch | 112 | 422 | 63461 |
Angel Rubio | 110 | 930 | 52731 |
Alan Campbell | 109 | 687 | 53463 |
Boris I. Yakobson | 107 | 443 | 45174 |
O. C. Zienkiewicz | 107 | 455 | 71204 |
John R. Reynolds | 105 | 607 | 50027 |