• Abundances Of Neutron-Capture Elements In Metal-Poor Stars 

    Gratton, Raffaele Gratton; Sneden, Christopher (1994-06)
    We use a large set of high S/N, high resolution spectra of 19 stars with -2.8 <[Fe/H]< 0 to study the abundances of neutron-rich elements in metal-poor stars. Basic data (atmospheric parameters, iron abundances, abundance ...
  • The Abundances Of Neutron-Capture Species In The Very Metal-Poor Globular Cluster M15: A Uniform Analysis Of Red Giant Branch And Red Horizontal Branch Stars 

    Sobeck, Jennifer S.; Kraft, Robert P.; Sneden, Christopher; Preston, George W.; Cowan, John J.; Smith, Graeme H.; Thompson, Ian B.; Shectman, Stephen A.; Burley, Gregory S. (2011-06)
    The globular cluster M15 is unique in its display of star-to-star variations in the neutron-capture elements. Comprehensive abundance surveys have been previously conducted for handfuls of M15 red giant branch (RGB) and ...
  • The Abundances Of Polyacetylenes Toward CRL618 

    Fonfria, J. P.; Cernicharo, J.; Richter, Matthew J.; Lacy, John H. (2011-02)
    We present a mid-infrared high spectral resolution spectrum of CRL618 in the frequency ranges 778-784 and 1227-1249 cm(-1) (8.01-8.15 and 12.75-12.85 mu m) taken with the Texas Echelon-cross-Echelle Spectrograph (TEXES) ...
  • Acceleration Of Protons To Above 6 MeV Using H2O >Snow> Nanowire Targets 

    Pomerantz, I.; Schleifer, E.; Nahum, E.; Eisenmann, S.; Botton, M.; Gordon, D.; Sprangel, P.; Zigler, A. (2012-11)
    A scheme is presented for using H2O >snow> nanowire targets for the generation of fast protons. This novel method may relax the requirements for very high laser intensities, thus reducing the size and cost of laser based ...
  • Accommodating flexible substitution patterns in multi-dimensional choice modeling: Formulation and application to travel mode and departure time choice 

    Bhat, Chandra R. (Elsevier, 1998)
    The nested logit model has been used extensively to model multi-dimensional choice situations. A drawback of the nested logit model is that it does not allow choice alternatives to share common unobserved attributes ...
  • Accommodating Multiple Constraints in the Multiple Discrete-Continuous Extreme Value (MDCEV) Choice Model 

    Castro, Marisol; Bhat, Chandra R.; Pendyala, Ram M.; Jara-Diaz, Sergio R. (Transportation Research Board of the National Academies, 2012)
    Multiple-discrete continuous choice models formulated and applied in recent years consider a single linear resource constraint, which, when combined with consumer preferences, determines the optimal consumption point. ...
  • Accommodating Spatial Correlation Across Choice Alternatives in Discrete Choice Models: An Application to Modeling Residential Location Choice Behavior 

    Sener, Ipek N.; Pendyala, Ram M.; Bhat, Chandra R. (Elsevier, 2011)
    This paper presents a modeling methodology capable of accounting for spatial correlation across choice alternatives in discrete choice modeling applications. Many location choice (e.g., residential location, workplace ...
  • Accretion Disk Temperatures Of QSOs: Constraints From The Emission Lines 

    Bonning, E. W.; Shields, Gregory A.; Stevens, A. C.; Salviander, Sarah (2013-06)
    We compare QSO emission-line spectra to predictions based on theoretical ionizing continua of accretion disks. The observed line intensities do not show the expected trend of higher ionization with theoretical accretion ...
  • Accretion Onto "Seed" Black Holes In The First Galaxies 

    Milosavljevic, Milos; Bromm, Volker; Couch, Sean M.; Oh, S. Peng (2009-06)
    The validity of the hypothesis that the massive black holes in high redshift quasars grew from stellar-sized "seeds" is contingent on a seed's ability to double its mass every few 10 million years. This requires that the ...
  • Accuracy of RNA-Seq and its dependence on sequencing depth 

    Cai, Guoshuai; Li, Hua; Lu, Yue; Huang, Xuelin; Lee, Juhee; Muller, Peter; Ji, Yuan; Liang, Shoudan (BMC Bioinformatics, 2012-08-24)
    Background: The cost of DNA sequencing has undergone a dramatical reduction in the past decade. As a result, sequencing technologies have been increasingly applied to genomic research. RNA-Seq is becoming a common technique ...
  • Accuracy of RNA-Seq and its dependence on sequencing depth 

    Cai, Guoshuai; Li, Hua; Lu, Yue; Huang, Xuelin; Lee, Juhee; Muller, Peter; Ji, Yuan; Liang, Shoudan (BMC Bioinformatics, 2012-08-24)
    Background: The cost of DNA sequencing has undergone a dramatical reduction in the past decade. As a result, sequencing technologies have been increasingly applied to genomic research. RNA-Seq is becoming a common technique ...
  • Acoustic Radiation Force On A Sphere In Tissue 

    Ilinskii, Y. A.; Zabolotskaya, E. A.; Hamilton, M. F. (2012-05)
    A theory is presented for the acoustic radiation force on a sphere embedded in a soft elastic medium that possesses a shear modulus several orders of magnitude smaller than its bulk modulus. Scattering of both compressional ...
  • The ACS Nearby Galaxy Survey Treasury. III. Cepheids In The Outer Disk Of M81 

    McCommas, Les P.; Yoachim, Peter; Williams, Benjamin F.; Dalcanton, Julianne J.; Davis, Matthew R.; Dolphin, Andrew E. (2009-06)
    The ACS Nearby Galaxy Survey Treasury (ANGST) has acquired deep ACS imaging of a field in the outer disk of the large spiral galaxy M81. These data were obtained over a total of 20 Hubble Space Telescope orbits, providing ...
  • The ACS Survey Of Galactic Globular Clusters. III. The Double Subgiant Branch Of NGC 1851 

    Milone, A. P.; Bedin, L. R.; Piotto, G.; Anderson, J.; King, I. R.; Sarajedini, A.; Dotter, A.; Chaboyer, B.; Marin-Franch, A.; Majewski, S.; Aparicio, A.; Hempel, M.; Paust, N. E. Q.; Reid, I. N.; Rosenberg, A.; Siegel, M. (2008-01)
    Photometry with the Hubble Space Telescope Advanced Camera for Surveys (HSTACS) reveals that the subgiant branch (SGB) of the globular cluster NGC 1851 splits into two well-defined branches. If the split is due only to an ...
  • The ACS Survey Of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster 

    Paust, Nathaniel E. Q.; Aparicio, Antonio; Piotto, Giampaolo; Reid, I. Neill; Anderson, Jay; Sarajedini, Ata; Bedin, Luigi R.; Chaboyer, Brian; Dotter, Aaron; Hempel, Maren; Majewski, Steven; Marin-Franch, A.; Milone, Antonio; Rosenberg, Alfred; Siegel, Michael (2009-01)
    We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic globular clusters (GCs) to construct a color-magnitude diagram for the bulge cluster, NGC 6366. The luminosity function derived ...
  • The ACS Survey Of Galactic Globular Clusters. VII. Relative Ages 

    Marin-Franch, Antonio; Aparicio, Antonio; Piotto, Giampaolo; Rosenberg, Alfred; Chaboyer, Brian; Sarajedini, Ata; Siegel, Michael; Anderson, Jay; Bedin, Luigi R.; Dotter, Aaron; Hempel, Maren; King, Ivan; Majewski, Steven; Milone, Antonino P.; Paust, Nathaniel; Reid, I. Neill (2009-04)
    The ACS Survey of Galactic globular clusters is a Hubble Space Telescope Treasury program designed to provide a new large, deep, and homogeneous photometric database. Based on observations from this program, we have measured ...
  • The ACS Survey Of Galactic Globular Clusters. VIII. Effects Of Environment On Globular Cluster Global Mass Functions 

    Paust, Nathaniel EQ; I. Neill Reid; Giampaolo Piotto; Antonio Aparicio; Jay Anderson; Ata Sarajedini; Luigi R. Bedin; Chaboyer, Brian; Dotter, Aaron; Hempel, Maren; Majewski, Steven; Marin-Franch, A.; Milone, Antonio; Rosenberg, Alfred; Siegel, Michael (2010-02)
    We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic Globular Clusters to construct global present-day mass functions for 17 globular clusters utilizing multi-mass King models to ...
  • The ACS Survey Of Globular Clusters. V. Generating A Comprehensive Star Catalog For Each Cluster 

    Anderson, Jay; Ata Sarajedini; Luigi R. Bedin; Ivan R. King; Giampaolo Piotto; I. Neill Reid; Michael Siegel; Majewski, Steven R.; Paust, Nathaniel E. Q.; Aparicio, Antonio; Milone, Antonio P.; Chaboyer, Brian; Rosenberg, Alfred (2008-06)
    The ACS Survey of Globular Clusters has used Hubble Space Telescope's Wide-Field Channel to obtain uniform imaging of 65 of the nearest globular clusters to provide an extensive homogeneous data set for a broad range of ...
  • Activation of Arabidopsis Seed Hair Development by Cotton Fiber-Related Genes 

    Guan, Xueying; Lee, Jinsuk J.; Pang, Mingxiong; Shi, Xiaoli; Stelly, David M.; Chen, Z. Jeffrey (Public Library of Science, 2011-07-11)
    Each cotton fiber is a single-celled seed trichome or hair, and over 20,000 fibers may develop semi-synchronously on each seed. The molecular basis for seed hair development is unknown but is likely to share many similarities ...