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Articles 61 - 82 of 82
Full-Text Articles in Physical Sciences and Mathematics
Sptizer And Jcmt Observations Of The Active Galactic Nucleus In The Sombrero Galaxy (Ngc 4594), G. J. Bendo, B. A. Buckalew, D. A. Dale, B. T. Draine, R. D. Joseph, R. C. Kennicutt, K. Sheth, J.D. T. Smith, F. Walter, D. Calzetti, John M. Cannon, C. W. Engelbracht, K. D. Gordon, G. Helou, D. Hollenbach, E. J. Murphy, H. Roussel
Sptizer And Jcmt Observations Of The Active Galactic Nucleus In The Sombrero Galaxy (Ngc 4594), G. J. Bendo, B. A. Buckalew, D. A. Dale, B. T. Draine, R. D. Joseph, R. C. Kennicutt, K. Sheth, J.D. T. Smith, F. Walter, D. Calzetti, John M. Cannon, C. W. Engelbracht, K. D. Gordon, G. Helou, D. Hollenbach, E. J. Murphy, H. Roussel
John Cannon
No abstract provided.
Hot Dust And Pah Emission At Low Metallicity: A Spitzer Survey Of Local Group And Other Nearby Dwarf Galaxies, D. C. Jackson, John M. Cannon, E. D. Skillman, H. Lee, R. D. Gehrz, C. E. Woodward, E. Polomski
Hot Dust And Pah Emission At Low Metallicity: A Spitzer Survey Of Local Group And Other Nearby Dwarf Galaxies, D. C. Jackson, John M. Cannon, E. D. Skillman, H. Lee, R. D. Gehrz, C. E. Woodward, E. Polomski
John Cannon
No abstract provided.
On Extending The Mass-Metallicity Relation Of Galaxies By 2.5 Decades In Stellar Mass, H. Lee, E. D. Skillman, John M. Cannon, D. C. Jackson, R. D. Gehrz, E. F. Polomski, C. E. Woodward
On Extending The Mass-Metallicity Relation Of Galaxies By 2.5 Decades In Stellar Mass, H. Lee, E. D. Skillman, John M. Cannon, D. C. Jackson, R. D. Gehrz, E. F. Polomski, C. E. Woodward
John Cannon
No abstract provided.
An Initial Look At The Far Infrared-Radio Correlation Within Nearby Star-Forming Galaxies Using The Spitzer Space Telescope, E. J. Murphy, R. Braun, G. Helou, L. Armus, J.D. P. Kenney, K. D. Gordon, G. J. Bendo, D. A. Dale, F. Walter, T. A. Oosterloo, R. C. Kennicutt, D. Calzetti, John M. Cannon, B. T. Draine, C. W. Engelbracht, D. J. Hollenbach, T. H. Jarrett, L. J. Kewley, C. Leitherer, A. Li, M. J. Meyer, M. W. Regan, G. H. Rieke, M. J. Rieke, H. Roussel, K. Sheth, J.D. T. Smith, M. D. Thornley
An Initial Look At The Far Infrared-Radio Correlation Within Nearby Star-Forming Galaxies Using The Spitzer Space Telescope, E. J. Murphy, R. Braun, G. Helou, L. Armus, J.D. P. Kenney, K. D. Gordon, G. J. Bendo, D. A. Dale, F. Walter, T. A. Oosterloo, R. C. Kennicutt, D. Calzetti, John M. Cannon, B. T. Draine, C. W. Engelbracht, D. J. Hollenbach, T. H. Jarrett, L. J. Kewley, C. Leitherer, A. Li, M. J. Meyer, M. W. Regan, G. H. Rieke, M. J. Rieke, H. Roussel, K. Sheth, J.D. T. Smith, M. D. Thornley
John Cannon
No abstract provided.
The Nature Of Infrared Emission In The Local Group Dwarf Galazy Ncg 6822 As Revealed By Spitzer, John M. Cannon, F. Walter, L. Armus, G. J. Bendo, D. Calzetti, B. T. Draine, C.W. Engelbracht, G. Helou, R. C. Kennicutt, C. Leitherer, H. Roussel, C. Bot, B. Buckalew, D. A. Dale, W. J.G. Deblok, K. D. Gordon, D. J. Hollenbach, T. H. Jarrett, M. J. Meyer, E. J. Murphy, K. Sheth, M. D. Thornley
The Nature Of Infrared Emission In The Local Group Dwarf Galazy Ncg 6822 As Revealed By Spitzer, John M. Cannon, F. Walter, L. Armus, G. J. Bendo, D. Calzetti, B. T. Draine, C.W. Engelbracht, G. Helou, R. C. Kennicutt, C. Leitherer, H. Roussel, C. Bot, B. Buckalew, D. A. Dale, W. J.G. Deblok, K. D. Gordon, D. J. Hollenbach, T. H. Jarrett, M. J. Meyer, E. J. Murphy, K. Sheth, M. D. Thornley
John Cannon
No abstract provided.
Microgravity Studies Of Aggregation In Particulate Clouds, Todd B. Sauke, J. R. Marshall, J. N. Cuzzi
Microgravity Studies Of Aggregation In Particulate Clouds, Todd B. Sauke, J. R. Marshall, J. N. Cuzzi
Todd B. Sauke
Aggregation in clouds of submillimeter quartz and volcanic ash particles was studied in microgravity. Particle clouds generated by pulses of air immediately formed electrostatic filamentary aggregates upon cessation of air turbulence. Manual agitation of experiment chambers produced cm-size loose grain clusters which voraciously scavenged free-floating material in their vicinity. A dipole model accounts for these observations. Experimental results have ramifications for the behavior of natural cloud systems and primary accretion of solids in the early solar nebula.
The Attitudes Of Educators To Information Technology Adoption In Schools Settings, Manoj Maharaj, Wesley Govender
The Attitudes Of Educators To Information Technology Adoption In Schools Settings, Manoj Maharaj, Wesley Govender
Manoj Maharaj
No abstract provided.
The Infrared Spectral Energy Distributions Of Nearby Galaxies, D. A. Dale, G. J. Bendo, C. W. Engelbracht, K. D. Gordon, M. W. Regan, L. Armus, John M. Cannon, D. Calzetti, B. T. Draine, G. Helou, R. D. Joseph, R. C. Kennicutt, A. Li, E. J. Murphy, H. Roussel, F. Walter, H. M. Hanson, D. J. Hollenbach, T. H. Jarrett, L. J. Kewley, C. A. Lamanna, C. Leitherer, M. Meyer, G. H. Rieke, M. J. Rieke, K. Sheth, J.D. T. Smith, M. D. Thornley
The Infrared Spectral Energy Distributions Of Nearby Galaxies, D. A. Dale, G. J. Bendo, C. W. Engelbracht, K. D. Gordon, M. W. Regan, L. Armus, John M. Cannon, D. Calzetti, B. T. Draine, G. Helou, R. D. Joseph, R. C. Kennicutt, A. Li, E. J. Murphy, H. Roussel, F. Walter, H. M. Hanson, D. J. Hollenbach, T. H. Jarrett, L. J. Kewley, C. A. Lamanna, C. Leitherer, M. Meyer, G. H. Rieke, M. J. Rieke, K. Sheth, J.D. T. Smith, M. D. Thornley
John Cannon
No abstract provided.
Probing The Multiphase Interstellar Medium Of The Dwarf Starbust Galaxy Ngc 625 With Fuse Spectroscopy, John M. Cannon, E. D. Skillman, K. R. Sembach, D. J. Bomans
Probing The Multiphase Interstellar Medium Of The Dwarf Starbust Galaxy Ngc 625 With Fuse Spectroscopy, John M. Cannon, E. D. Skillman, K. R. Sembach, D. J. Bomans
John Cannon
No abstract provided.
The Nature Of Radio Continuum Emission At Very Low Metallicity: Vla Observations Of I Zw 18, John M. Cannon, E. D. Skillman, L. Van Zee, F. Walter
The Nature Of Radio Continuum Emission At Very Low Metallicity: Vla Observations Of I Zw 18, John M. Cannon, E. D. Skillman, L. Van Zee, F. Walter
John Cannon
No abstract provided.
Spitzer Observations Of The Supergiant Shell Region In Ic 2574, John M. Cannon, F. Walter, G. J. Bendo, D. Calzetti, D. A. Dale, B. T. Draine, C. W. Engelbracht, K. D. Gordon, G. Helou, R. C. Kennicutt, E. J. Murphy, M. D. Thornley, L. Armus, D. J. Hollenbach, C. Leitherer, M. W. Regan, H. Roussel, K. Sheth
Spitzer Observations Of The Supergiant Shell Region In Ic 2574, John M. Cannon, F. Walter, G. J. Bendo, D. Calzetti, D. A. Dale, B. T. Draine, C. W. Engelbracht, K. D. Gordon, G. Helou, R. C. Kennicutt, E. J. Murphy, M. D. Thornley, L. Armus, D. J. Hollenbach, C. Leitherer, M. W. Regan, H. Roussel, K. Sheth
John Cannon
No abstract provided.
Extended Tidal Structure In Two Lyalpha-Emitting Starburst Galaxies, John M. Cannon, E D. Skillman, D Kunth, C Leitherer, M Mas-Hesse, G Östlin, A Petrosian
Extended Tidal Structure In Two Lyalpha-Emitting Starburst Galaxies, John M. Cannon, E D. Skillman, D Kunth, C Leitherer, M Mas-Hesse, G Östlin, A Petrosian
John Cannon
No abstract provided.
The Nature Of Radio Continuum Emission In The Dwarf Starburst Galaxy Ngc 625, John M. Cannon, E. D. Skillman
The Nature Of Radio Continuum Emission In The Dwarf Starburst Galaxy Ngc 625, John M. Cannon, E. D. Skillman
John Cannon
No abstract provided.
Hi Observations Of The Local Group Dwarf Wlm, D. Jackson, E. D. Skillman, John M. Cannon, S. Cote
Hi Observations Of The Local Group Dwarf Wlm, D. Jackson, E. D. Skillman, John M. Cannon, S. Cote
John Cannon
No abstract provided.
Potential Impact Of Subsonic And Supersonic Aircraft Exhaust On Water Vapor In The Lower Stratosphere Assessed Via A Trajectory Model, Gary A. Morris, Joan A. Rosenfield, Mark R. Schoeberl, Charles A. Jackman
Potential Impact Of Subsonic And Supersonic Aircraft Exhaust On Water Vapor In The Lower Stratosphere Assessed Via A Trajectory Model, Gary A. Morris, Joan A. Rosenfield, Mark R. Schoeberl, Charles A. Jackman
Gary A. Morris
We employ a trajectory model to assess the impact on the stratosphere of water vapor present in the exhaust of subsonic and a proposed fleet of supersonic aircraft. Air parcels into which water vapor from aircraft exhaust has been injected are run through a 6-year simulation in the trajectory model using meteorological data from the UKMO analyses with emissions dictated by the standard 2015 emissions scenario. For the subsonic aircraft, our results suggest maximum enhancements of ~150 ppbv just above the Northern Hemisphere tropopause and of much less than 50 ppbv in most other regions. Inserting the perturbed water vapor …
A Comparison Of Haloe V19 With Sage Ii V6.00 Ozone Observations Using Trajectory Mapping, Gary A. Morris, James F. Gleason, James M. Russell Iii, Mark R. Schoeberl, M. Patrick Mccormick
A Comparison Of Haloe V19 With Sage Ii V6.00 Ozone Observations Using Trajectory Mapping, Gary A. Morris, James F. Gleason, James M. Russell Iii, Mark R. Schoeberl, M. Patrick Mccormick
Gary A. Morris
We apply trajectory mapping to an 8-year intercomparison of ozone observations from the Halogen Occultation Experiment (HALOE) (V19) and Stratospheric Aerosol and Gas Experiment (SAGE) II (V6.00) for the months March, May, June, September, October, and December from the period December 1991 to October 1999. Our results, which represent the most extensive such intercomparison of these two data sets to date, suggest a root-mean-square difference between the two data sets of >15% below 22 km in the tropics and of 4–12% throughout most of the rest of the stratosphere. In addition, we find a bias with HALOE ozone low relative …
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Gary A. Morris
The problem of creating synoptic maps from asynoptically gathered trace gas data has prompted the development of a number of schemes. Most notable among these schemes are the Kalman filter, the Salby-Fourier technique, and constituent reconstruction. This paper explores a new technique called "trajectory mapping." Trajectory mapping creates synoptic maps from asynoptically gathered data by advecting measurements backward or forward in time using analyzed wind fields. A significant portion of this work is devoted to an analysis of errors in synoptic trajectory maps associated with the calculation of individual parcel trajectories. In particular, we have considered (1) calculational errors; (2) …
Multi-Ball Collisions, Terry L. Smith, Jay S. Huebner
Multi-Ball Collisions, Terry L. Smith, Jay S. Huebner
Terry L. Smith
Explanation to use the "double-ball" demonstration as a model for the supernova core bounce.
Stable Isotope Analysis Using Tunable Diode Laser Spectroscopy, Todd Sauke, J. Becker, M. Loewenstein
Stable Isotope Analysis Using Tunable Diode Laser Spectroscopy, Todd Sauke, J. Becker, M. Loewenstein
Todd B. Sauke
Measurements of ratios of stable isotopes are used in such diverse fields as petroleum prospecting, medical diagnostics, and planetary exploration. The narrow emission linewidth available from tunable diode lasers permits high-resolution infrared absorption measurements of closely spaced isotopic rovibrational lines. Our dual beam spectrometer uses the sweep integration technique in a spectral region where adjacent spectral lines are of approximately equal absorbance at the expected isotopic abundances. The experimental results reported here indicate that isotopic ratios of carbon in carbon dioxide can be measured to an accuracy of better than 0.4%. This laser spectroscopic spectrometric technique offers an alternative to …
Determination Of Rate Distributions From Kinetic Experiments, Todd B. Sauke, P. J. Steinback, K. Chu, H. Frauenfelder, J. B. Johnson, D. C. Lamb, G. U. Nienhaus, R. D. Young
Determination Of Rate Distributions From Kinetic Experiments, Todd B. Sauke, P. J. Steinback, K. Chu, H. Frauenfelder, J. B. Johnson, D. C. Lamb, G. U. Nienhaus, R. D. Young
Todd B. Sauke
Rate processes in proteins are often not adequately described by simple exponential kinetics. Instead of modeling the kinetics in the time domain, it can be advantageous to perform a numerical inversion leading to a rate distribution function f(lambda). The features observed in f(lambda) (number, positions, and shapes of peaks) can then be interpreted. We discuss different numerical techniques for obtaining rate distribution functions, with special emphasis on the maximum entropy method. Examples are given for the application of these techniques to flash photolysis data of heme proteins.
Inhomogeneous Broadening In Spectral Bands Of Carbonmonoxymyoglobin: The Connection Between Spectral And Functional Heterogeneity, Todd B. Sauke, P. Ormos, A. Ansari, D. Braunstein, B. R. Cowen, H. Fraunfelder, M. K. Hong, I. E. T. Iben, P. J. Steinbach, R. D. Young
Inhomogeneous Broadening In Spectral Bands Of Carbonmonoxymyoglobin: The Connection Between Spectral And Functional Heterogeneity, Todd B. Sauke, P. Ormos, A. Ansari, D. Braunstein, B. R. Cowen, H. Fraunfelder, M. K. Hong, I. E. T. Iben, P. J. Steinbach, R. D. Young
Todd B. Sauke
The rebinding kinetics of CO to myoglobin after flash photolysis is nonexponential in time below approximately 180 K; the kinetics is governed by a distribution of enthalpic barriers. This distribution results from inhomogeneities in the protein conformation, referred to as conformational substates. Hole-burning experiments on the Soret and IR CO-stretch bands test the assumption that an inhomogeneous distribution of conformational substates results in inhomogeneously broadened spectra. CO was slowly photolyzed at different wavelengths in the Soret band at 10 K. Both the Soret band and the CO-stretch band A1, centered at 1,945 cm-1, shift during photolysis, demonstrating that different wavelengths …
Microcomputer In An Introductory College Astronomy Laboratory: A Software Development Project, D D. Meisel, K F. Kinsey, Charles H. Recchia
Microcomputer In An Introductory College Astronomy Laboratory: A Software Development Project, D D. Meisel, K F. Kinsey, Charles H. Recchia
Charles H Recchia
No abstract provided.