Now showing items 6868-6887 of 18296

    • The H 2 SO 4 -HNO 3 -NH 3 system at high humidities and in fogs: 1. Spatial and temporal patterns in the San Joaquin Valley of California 

      Jacob, Daniel James; Munger, J. William; Waldman, Jed M.; Hoffmann, Michael R. (Wiley-Blackwell, 1986)
      A systematic characterization of the atmospheric H2SO4-HNO3-NH3 system was conducted in the fog water, the aerosol, and the gas phase at a network of sites in the San Joaquin Valley of California. Spatial patterns of ...
    • H(3)(+) emission in the ejecta of SN 1987A 

      Yan, Min; Dalgarno, A. (American Astronomical Society, 2009)
      We present a chemical and thermal model of the envelope of SN 1987A. We assume that half of the hydrogen envelope is broken into many dense clumps and mixed into the inner region. For a range of densities and energy ...
    • The H-beta emission line profile of Arakelian 120 

      Foltz, C. B.; Wilkes, Belinda Jane; Peterson, B. M. (IOP Publishing, 1983)
      A high-quality (S/N in the range from 30 to 100), high-resolution (approximately 1.8 A) spectrum of the photometrically and spectroscopically variable Seyfert 1 galaxy Arakelian 120 has been obtained in the wavelength ...
    • H-means image segmentation to identify solar thermal features 

      Stein, Nathan Mathes; Stein, Nathan; Kashyap, Vinay L.; Meng, Xiao-Li; van Dyk, David (Institute of Electrical and Electronics Engineers, 2012)
      Properly segmenting multiband images of the Sun by their thermal properties will help determine the thermal structure of the solar corona. However, off-the-shelf segmentation algorithms are typically inappropriate because ...
    • H. Gregg Lewis Memorial Comments 

      Ashenfelter, Orley; Rosen, Sherwin; Freeman, Richard Barry; McElroy, Marjorie B. (University of Chicago Press, 1994)
    • H2 excitation in turbulent interstellar clouds 

      Cecchi-Pestellini, C.; Casu, S.; Dalgarno, Alexander (Oxford University Press (OUP), 2005)
      We discuss the observational differences between lines of sight that intercept a group of turbulent dissipative structures and lines of sight that cross less-active regions. Using time-dependent calculations we show that ...
    • H2CO and N2H+ in Protoplanetary Disks: Evidence for a CO-Ice Regulated Chemistry 

      Qi, Chunhua; Oberg, Karin; Wilner, David J. (IOP Publishing, 2013)
      We present Submillimeter Array observations of H2CO and N2H+ emission in the disks around the T Tauri star TW Hya and the Herbig Ae star HD 163296 at 2"-6" resolution and discuss the distribution of these species with ...
    • H2CO Distribution and Formation in the TW HYA Disk 

      Oberg, Karin; Guzman, Viviana; Merchantz, Christopher; Qi, Chunhua; Andrews, Sean; Cleeves, Lauren; Huang, Jane; Loomis, Ryan; Wilner, David; Brinch, Christian; Hogerheijde, Michiel (American Astronomical Society, 2017-04-12)
      H2CO is one of the most readily detected organic molecules in protoplanetary disks. Yet its distribution and dominant formation pathway(s) remain largely unconstrained. To address these issues, we present ALMA observations ...
    • H2O Masers and Supersonic Turbulence 

      Strelnitski, V.; Alexander, J.; Gezari, S.; Holder, B. P.; Moran, James M.; Reid, Malcolm Jamieson (IOP Publishing, 2002)
      We use unpublished and published VLBI results to investigate the geometry and the statistical properties of the velocity field traced by H2O masers in five galactic regions of star formation — Sgr B2(M), W49N, W51(MAIN), ...
    • H3+ in Diffuse Interstellar Gas 

      Cecchi-Pestellini, C.; Dalgarno, Alexander (Oxford University Press (OUP), 2000)
      A model is constructed of the material in front of the star Cygnus OB2 no. 12 in which dense cores are embedded in diffuse clumps of gas. The model reproduces the measured abundances of Graphic C2 and CO, and predicts a ...
    • The \(H_2SO_4-HNO_3-NH_3\) system at high humidities and in fogs: 2. Comparison of field data with thermodynamic calculations 

      Jacob, Daniel James; Waldman, Jed M.; Munger, J. William; Hoffmann, Michael R. (Wiley-Blackwell, 1986)
      Concentrations of HNO(g) and NH(g) determined in the field were compared to predictions from aerosol equilibrium models. The products of HNO(g) and NH(g) concentrations measured under cool and humid nonfoggy conditions ...
    • The habenular nuclei: a conserved asymmetric relay station in the vertebrate brain 

      Bianco, Isaac; Wilson, Stephen W. (The Royal Society, 2009)
      The dorsal diencephalon, or epithalamus, contains the bilaterally paired habenular nuclei and the pineal complex. The habenulae form part of the dorsal diencephalic conduction (DDC) system, a highly conserved pathway found ...
    • Habitat use affects morphological diversification in dragon lizards 

      Collar, D. C.; Schulte, J. A.; O’Meara, B. C.; Losos, Jonathan (Wiley-Blackwell, 2010)
      Habitat use may lead to variation in diversity among evolutionary lineages because habitats differ in the variety of ways they allow for species to make a living. Here, we show that structural habitats contribute to ...
    • The Haitian Declaration of Independence in an Atlantic Context 

      Armitage, David R.; Gaffield, Julia (University of Virginia Press, 2016)
    • Haitian Migration and Danced Identity in Eastern Cuba 

      Viddal, Grete Tove (University Press of Florida, 2010)
    • Haiti’s progress in achieving its 10-year plan to eliminate cholera: hidden sickness cannot be cured 

      Koski-Karell, Victoria; Farmer, Paul E; Isaac, Benito; Campa, Elizabeth M; Viaud, Loune; Namphy, Paul C; Ternier, Ralph; Ivers, Louise C (Dove Medical Press, 2016)
      Since the beginning of the cholera epidemic in Haiti 5 years ago, the prevalence of this deadly water-borne disease has fallen far below the initial rates registered during its explosive outset. However, cholera continues ...
    • A Half-Century of Development 

      Cooper, Richard (Center for International Development at Harvard University, 2005)
      Development as a global policy objective dates from the 1940s. Relative to expectations then, the world economy performed outstandingly well during the second half of the 20th century. Worldwide growth in average per capita ...
    • Half-Cycle-Pulse-Train Induced State Redistribution of Rydberg Atoms 

      Mandal, Pankaj; Speck, Andrew J. (American Physical Society, 2010)
      Population transfer between low-lying Rydberg states independent of the initial state is realized using a train of half-cycle pulses with pulse durations much shorter than the classical orbital period. We demonstrate ...
    • Hall carrier density and magnetoresistance measurements in thin-film vanadium dioxide across the metal-insulator transition 

      Ruzmetov, Dmitry; Heiman, Don; Claflin, Bruce B.; Narayanamurti, Venkatesh; Ramanathan, Shriram (American Physical Society, 2009)
      Temperature-dependent magnetotransport measurements in magnetic fields of up to 12 T were performed on thin-film vanadium dioxide (VO(2)) across the metal-insulator transition (MIT). The Hall carrier density increases by ...