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open access

Fundamental Investigations of Nanoscale Phenomena in Beam-Assisted Nucleation, Growth and Surface Smoothing, Using in situ LEEM

Description: The purposes for which this grant was provided were specifically (1) to construct a tandem instrument that combined a low energy electron microscope (LEEM) with an ion beam source capably of irradiating a sample during observation of the surface using LEEM; and (2) to employ the new machine to whatever degree possible to observe the evolution of clean crystal surfaces during ion beam irradiation. A principal motivation was to investigate the fundamental behavior of radiation damage under circum… more
Date: November 5, 2008
Creator: Flynn, Colin P.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: 4-alarm fire]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: July 5, 1979, 6:00 p.m.
Duration: 1 minute 09 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

Qualitative aspects of neutron moderation with respect to graphite damage

Description: Under simplifying assumptions, an expression is obtained relating the integrated kinetic energy transferred to moderator atoms to the thermal neutron exposure in adjacent fuel. Reactor-dependent factors are explicit in the expression which make it possible to compare graphite contraction data from different reactors or to estimate graphite damage in a new reactor based oil observed damage in existent reactors. Graphite temperature, which may be an important factor in graphite contraction, is no… more
Date: May 5, 1960
Creator: Nilson, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three-group NPR core flux levels

Description: In order to predict graphite damage rates for the NPE, it is necessary to have some knowledge of the neutron fluxes at various energy levels. In particular it is important to know flux levels relative to those existing where graphite samples have been irradiated experimentally. Three-group flux levels have been calculated for regions far from boundaries in the core of the NPR and of a K-reactor. The results reported here have been obtained from more detailed calculations using better cross sect… more
Date: January 5, 1960
Creator: Simpson, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Galveston water]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6 P.M.
Date: June 5, 1981
Duration: 1 minute 08 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

[News Script: Airport]

Description: Script from the WBAP-TV/NBC station in Fort Worth, Texas, covering a broadcast news story.
Date: June 5, 1965
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Script
Partner: UNT Libraries Special Collections
open access

Federal Flood Policy Challenges: Lessons from the 2008 Midwest Flood

Description: This report provides a primer on recent developments, the federal role in flood policy, and the limitations of levees and dams. It also discusses lessons from the 2008 Midwest flood compared to the 1993 flood, and the evolution of U.S. flood policy. It pays particular attention to the role of Congress and federal agencies and programs, and the available tools for addressing the nation's flood challenge.
Date: February 5, 2009
Creator: Carter, Nicole T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of high resolution scatter images from laser damage experiments performed on KDP

Description: Interest in producing high damage threshold KH{sub 2}PO{sub 4} (KDP) and (D{sub x}H{sub 1-x}){sub 2}PO{sub 4} (KD*P, DKDP) for optical switching and frequency conversion applications is being driven by the system requirements for the National Ignition Facility (NIF) at Lawrence Livermore National Lab (LLNL). Historically, the path to achieving higher damage thresholds has been to improve the purity of crystal growth solutions. Application of advanced filtration technology has increased the dama… more
Date: January 5, 1996
Creator: Runkel, M.; Woods, B. & Yan, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Influence of microstructure on laser damage threshold of IBS coatings

Description: Ion-beam sputtering (IBS) coatings were developed for the laser gyro industry to meet significantly different requirements than those of fusion lasers. Laser gyro mirrors are small (< 25 mm) and require low losses (< 30 ppm typical) and high stability with long exposures to low power laser energy. In contrast, fusion laser optics are large (< 1 meter), have significantly reduced loss requirements (< 5,000 ppm) and high damage thresholds (> 26 J/cm{sup 2} at 1,064 nm with 3-ns pulses). As part o… more
Date: January 5, 1996
Creator: Stolz, C. J.; Genin, F. Y.; Kozlowski, M. R.; Long, D.; Lalazari, R.; Wu, Z. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using time-frequency and wavelet analysis to assess turbulence/rotor interactions

Description: Large loading events on wind turbine rotor blades are often associated with transient bursts of coherent turbulent energy in the turbine inflow. These coherent turbulent structures are identified as peaks in the three-dimensional, instantaneous, turbulent shearing stress field. Such organized inflow structures and the accompanying rotor aeroelastic responses typically have time scales of only a few seconds and therefore do not lend themselves for analysis by conventional Fourier spectral techni… more
Date: January 5, 2000
Creator: Kelley, N. D.; Osgood, R. M.; Bialasiewicz, J. T. & Jakubowski, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of Silica overlayers on laser damage of HfO{sub 2}-SiO{sub 2}56{sup degree} incidence high reflectors

Description: A series of hafnia/silica, oblique incidence (56{degrees}), 1064 nm high reflectors (HRs) were prepared and coated with silica overlayers of varying optical thickness from {lambda}/2 to 4{lambda} in order to determine the effect of an overlayer on the laser-damage resistance of the HRs. The stress and laser damage thresholds for S and P polarization of the HRs were measured, and the damage sites for P polarization examined by Atomic Force Microscopy (AFM). All the multilayers were found to be i… more
Date: January 5, 1995
Creator: Walton, C. C.; Genin, F. Y.; Chow, R.; Kozlowski, M. R.; Loomis, G. E. & Pierce, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Car in House]

Description: Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a news story about Earnest Ray Clay crashing his car into the home of C. S. Grayson in North Dallas.
Date: December 5, 1955
Duration: 46 seconds
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: Flood Police]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: May 5, 1990, 10:00 p.m.
Duration: 1 minute 15 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: Boyd Damage]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: June 5, 1991, 10:00 p.m.
Duration: 1 minute 38 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
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