181,022 research outputs found
Theory of dielectric screening and electron energy loss spectroscopy at surfaces
No full textWe present an overview of theoretical techniques for describing electron energy loss processes in a reflection geometry. We start from a fundamental representation of the dielectric susceptibility tensor of the semi-infinite crystal, and illustrate how the screening becomes modified by the presence of the surface. A new formalism is also presented which improves upon existing techniques for modeling energy loss, is fully q-dependent, and accounts for nonlocality. The impact of nonlocality, local field effects and other many-body effects is discussed. The theory is supported by some explicit calculations on the GaAs(001)-c(4 x 4) surface. To cite this article: C Hogan et al., C R. Physique 10 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved
Hogan, R C, 18313
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/392742Surname: HOGAN. Given Name(s) or Initials: R C. Military Service Number or Last Known Location: 18313. Missing, Wounded and Prisoner of War Enquiry Card Index Number: SEA-2158.211592
Item: [2016.0049.25035] "Hogan, R C, 18313
[C. U. Hogan at a Pioneer Memorial]
No full textC. U. Hogan standing next to a Denton County Pioneers memorial headstone while saluting. He is wearing a suit and holding his hat in is right hand. The memorial reads: "1851 1857 Dedicated to the Memory of the Denton County Pioneers Who Founded Alton By the Benjamin Lyon Chapter Daughters of the American Revolution 1930." The writing in white ink reads, "To my good friend Mr. Will Williams a useful and lovable citizen of Denton With my best wishes, C. A.[Hogan?] Aug. 17, 1953" (text not entirely readable, Hogan is a guess on the name in the dedication)
Omer C. Stewart with Navajo and hogan
No full textBlack and white photograph of Omer C. Stewart with five Indians (probably Navajo) in front of a traditional hogan
Geometric structure and optical properties of the GaAs(001)-c(4 X 4) surface
No full textWe consider the electronic structure and optical properties for several geometries of the GaAs(001)-c(4x4) surface using first-principles calculations. We find strong evidence that the best agreement with photoemission and reflectance anisotropy spectroscopy experiments carried out on surfaces prepared under As-4 flux is obtained for a structure containing three Ga-As dimers per unit cell. The standard As-As dimer model yields similar, but distinguishable results, while an asymmetric dimer model is found to yield completely incompatible surface spectra
ROTC Cadets and CSM George C. Hogan
No full textJacksonville State University CSM George C. Hogan, Ranger program supervisor, and cadets Jamie Martin and Don Owens are shown outside during training.https://digitalcommons.jsu.edu/rotc_photos/1477/thumbnail.jp
Navajo Dwelling (Hogan) P.3
No full text14498 Navajo Indian hogan, San Juan Co., near Gouldings\u27 Trading Post. Photo: Robert C. Tyler, former member of the Utah Writers\u27 staff
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