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The Clifton Record (Clifton, Tex.), Vol. 104, No. 28, Ed. 1 Wednesday, April 7, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 104, No. 37, Ed. 1 Friday, May 7, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 7, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 104, No. 54, Ed. 1 Wednesday, July 7, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
July 7, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Coffinitization of Uraninite: SEM/AEM Investigation and Geochemical Modeling
Coffinite (USiO{sub 4}) has been found in numerous sedimentary and hydrothermal environments including those considered as natural analogues of nuclear waste repositories. Scanning electron microscopy (SEM) and analytical electron microscopy (AEM) studies have been conducted on a uraninite sample from a U-deposit in Canada. It is observed that the uraninite (UO{sub 2+x}) is replaced by coffinite (U[SiO{sub 4}].nH{sub 2}O) and the replacing coffinite coexists with quartz. The TEM study shows {alpha}-recoil damage, lattice distortion, and low-angle boundaries among neighboring uraninite domains. Coffinitization seems more closely associated with {alpha}-recoil-damaged uraninite areas. Electron energy-loss spectroscopy (EELS) spectrum indicates that the ratio of U(+6)U(+4) in the uraninite is about 2/3, while the coffinite is dominated by U(+4). A thermodynamic calculation indicates that coffinitization can take place most likely at temperatures below 130 C if dissolved silica concentrations are limited by amorphous silica mineral phase. In a sufficiently high silica concentration environment, coffinite can form under the oxygen fugacity of 10{sup -65}-10{sup -55} atm. The equilibrium model, however, is not able to explain the coexistence of coffinite with quartz. A kinetic model that takes account of Ostwald processes is thus proposed. The kinetic model indicates that the presence of U(+6) in uraninite and the …
Date:
October 7, 1999
Creator:
Wang, Yifeng & Xu, Huifang
Object Type:
Article
System:
The UNT Digital Library
Cold Vacuum Drying Facility Final Hazard Analysis Report
This report describes the methodology used in conducting the Cold Vacuum Dlying Facility (CVDF) Hazard Analysis to support the CVDF Final Safety Analysis Report and documents the results. The hazard analysis was performed in accordance with DOE-STD-3009-94, ''Preparation Guide for U.S. Department of Energy Nonreactor Nuclear Facility Safety Analysis Reports,'' and implements the requirements of DOE Order 5480.23, ''Nuclear Safety Analysis Reports.''
Date:
June 7, 1999
Creator:
Powers, T. B.
Object Type:
Report
System:
The UNT Digital Library
The Collegian (Hurst, Tex.), Vol. 11, No. 22, Ed. 1 Wednesday, April 7, 1999
Weekly student newspaper published in Hurst, Texas serving the Tarrant County Junior College District that includes school news and information along with advertising.
Date:
April 7, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 18, No. 24, Ed. 1 Thursday, October 7, 1999
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 1999
Creator:
Fleming, Jackie
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier (The Colony, Tex.), Vol. 2, No. 22, Ed. 1 Wednesday, April 7, 1999
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 1999
Creator:
Chiniewicz, Susan
Object Type:
Newspaper
System:
The Portal to Texas History
Combating Terrorism: Need for Comprehensive Threat and Risk Assessments of Chemical and Biological Attacks
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO reviewed the scientific and practical aspects of a terrorist carrying out large-scale chemical or biological attacks on U.S. soil, focusing on the: (1) technical ease or difficulty for terrorists to acquire, process, improvise, and disseminate certain chemical and biological agents; and (2) extent to which the U.S. government has assessed the threats and risks posed by chemical and biological terrorism in the United States to serve as a basis for planned investments."
Date:
September 7, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
A Combinatorial Approach to Determine Mechanisms of Atmospheric Copper Sulfidation
Parallel microscopic experimentation (the combinatorial approach often used in solid-state science) was applied to characterize atmospheric copper corrosion behavior. Specifically, this technique permitted relative sulfidation rates to be determined for copper containing different levels of point defects and impurities (In, Al, O, and D). Corrosion studies are inherently difficult because of complex interactions between material interfaces and the environment. The combinatorial approach was demonstrated using micron-scale Cu lines that were exposed to a humid air environment containing sub-ppm levels of H{sub 2}S. The relative rate of Cu{sub 2}S growth was determined by measuring the change in resistance of the line. The data suggest that vacancy trapping by In and Al impurities slow the sulfidation rate. Increased sulfidation rates were found for samples containing excess point defects or deuterium. Furthermore, the sulfidation rate of 14 {micro}m wide Cu lines was increased above that for planar films.
Date:
October 7, 1999
Creator:
Barbour, J. Charles; Braithwaite, Jeffrey W.; Copeland, Robert Guild; Dunn, Roberto G.; Minor, Kenneth G.; Missert, Nancy A. et al.
Object Type:
Article
System:
The UNT Digital Library
Comparison of InP/InGaAs HBT and InAlAs/InGaAs HBT for ULP Applications
The increased demand for portable electronics has lead to the need for higher performance and efficiency. Devices operating at less than 50 {micro}W of power are defined as ultra-low-power (ULP) devices. New progress has been achieved on InP/InGaAs HBT and InAIAs/InGaAs HBT optimized for ULP applications. f{sub T} values of 2.2 GHz, and f{sub MAX} values of 20 GHz have been obtained for HBTs operating at less than 40 {micro}W. Current gain is greater than 45 with the device operating at less than 20 {micro}A on a 2.5 x 5 {micro}m{sup 2} device. These devices have been significantly improved over the previously reported MOCVD grown InP/InGaAs ULP HBT which has f{sub MAX} of 10 GHz operating in the ultra-low-power level. The improvements have been attributed to the reduction of base dopant diffusion associated with Zn doping.
Date:
July 7, 1999
Creator:
Ashby, C. I. H.; Baca, A. G.; Chang, P. C.; Hafich, M. J.; Hietala, V. M. & Klem, J. F.
Object Type:
Article
System:
The UNT Digital Library
Comparisons of cloud cover estimates and cloud fraction profiles from ARM's cloud-detecting instruments and GOES-8 data
The DOE's Atmospheric Radiation Measurement (ARM) Program employs both upward- and downward-looking remote-sensing instruments to measure the horizontal and vertical distributions of clouds across its Southern Great Plains (SGP) site. No single instrument is capable of completely determining these distributions over the scales of interest to ARM's Single Column Modeling (SCM) and Instantaneous Radiative Flux (IRF) groups; these groups embody the primary strategies through which ARM expects to achieve its objectives of developing and testing cloud formation parameterizations (USDOE, 1996). Collectively, however, the data from ARM's cloud-detecting instruments offer the potential for such a three-dimensional characterization. Data intercomparisons, like the ones illustrated in this paper, are steps in this direction. Examples of some initial comparisons, involving satellite, millimeter cloud radar, whole sky imager and ceilometer data, are provided herein. that many of the lessons learned can later be adapted to cloud data at the Boundary and Extended Facilities. Principally, we are concerned about: (1) the accuracy of various estimates of cloud properties at a single point, or within a thin vertical column, above the CF over time, and (2) the accuracy of various estimates of cloud properties over the Cloud and Radiation Testbed (CART) site, which can then be reduced …
Date:
May 7, 1999
Creator:
Krueger, S K & Rodriguez, D
Object Type:
Article
System:
The UNT Digital Library
Complex, Free-Boundary Problems in Materials Science. Final technical report for the period 2/1/95 - 1/31/98
None
Date:
December 7, 1999
Creator:
Davis, S. H.; Miksis, M. J. & Voorhees, P. W.
Object Type:
Report
System:
The UNT Digital Library
Computational Analysis of the SRS Phase III Salt Disposition Alternatives
Completion of the Phase III evaluation and comparison of salt disposition alternatives was supported with enhanced computer models and analysis for each case on the ''short list'' of four options. SPEEDUP(TM) models and special purpose models describing mass and energy balances and flow rates were developed and used to predict performance and production characteristics for each of the options. Results from the computational analysis were a key part of the input used to select a primary and an alternate salt disposition alternative.
Date:
October 7, 1999
Creator:
Dimenna, R. A.
Object Type:
Report
System:
The UNT Digital Library
Control of Growth Efficiency in Young Plantation Loblolly Pine and Sweetgum through Irrigation and Fertigation Enhancement of Leaf Carbon Gain
The overall objective of this study was to determine if growth efficiency of young plantation loblolly pine and sweetgum can be maintained by intensive forest management and whether increased carbon gain is the mechanism controlling growth efficiency response to resource augmentation. Key leaf physiological processes were examined over two growing seasons in response to irrigation, fertigation (irrigation with a fertilizer solution), and fertigation plus pest control (pine only). Although irrigation improved leaf net photosynthesis in pine and decreased stomatal sensitivity to vapor pressure deficit in sweetgum, no consistent physiological responses to fertigation were detected in either species. After 4 years of treatment, a 3-fold increase in woody net primary productivity was observed in both species in response to fertigation. Trees supplemented with fertigation and fertigation plus pest control exhibited the largest increases in growth and biomass. Furthermore, growth efficiency was maintained by fertigation and fertigation plus pest control, despite large increases in crown development and self-shading. Greater growth in response to intensive culture was facilitated by significant gains in leaf mass and whole tree carbon gain rather than detectable increases in leaf level processes. Growth efficiency was not maintained by significant increases in leaf level carbon gain but was possibly …
Date:
July 7, 1999
Creator:
Samuelson, L.
Object Type:
Report
System:
The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 119, No. 1, Ed. 1 Thursday, January 7, 1999
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
January 7, 1999
Creator:
Kisic, Theresa
Object Type:
Newspaper
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 119, No. 40, Ed. 1 Thursday, October 7, 1999
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 1999
Creator:
Kisic, Theresa
Object Type:
Newspaper
System:
The Portal to Texas History
The Correlation of Stress-State and Nano-Mechanical Properties in Au
A dependence of elastic response on the stress-state of a thin film has been demonstrated using the interfacial force microscope (IFM). Indentation response was measured as a function of the applied biaxial stress-state for 100 nm thick Au films. An increase in measured elastic modulus with applied compressive stress, and a decrease with applied tensile stress was observed. Measurements of elastic modulus before and after applying stress were identical indicating that the observed change in response is not due to a permanent change in film properties.
Date:
October 7, 1999
Creator:
Houston, Jack E.; Jarausch, K. F.; Kiely, J. D. & Russell, P. E.
Object Type:
Article
System:
The UNT Digital Library
The Cost of Being Here and There, Now: Implications for Communication in Computer-Mediated Collaborative Environments
None
Date:
September 7, 1999
Creator:
Raybourn, Elaine M.
Object Type:
Article
System:
The UNT Digital Library
Crime Technology: Federal Assistance to State and Local Law Enforcement
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the crime technology assistance provided by the federal government to state and local law enforcement agencies for fiscal years 1996 through 1998, focusing on the types and amounts of assistance provided by the Department of Justice (DOJ), the Department of the Treasury, and the Office of National Drug Control Policy (ONDCP)."
Date:
June 7, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Critique of a pion exchange model for interquark forces
The author describes four serious defects of a widely discuss pion exchange model for interquark forces: it doesn't solve the ``spin-orbit problem'' as advertised, it fails to describe the internal structure of baryon resonances, it leads to disastrous conclusions when extended to mesons, and it is not reasonably connected to the physics of heavy-light systems.
Date:
October 7, 1999
Creator:
Isgur, N.
Object Type:
Article
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 105, No. 14, Ed. 1 Wednesday, April 7, 1999
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas City Council Meeting: Inauguration 1999
Recording of the inauguration of new Dallas City Council members ...
Date:
June 7, 1999
Creator:
Dallas (Tex.). City Council.
Object Type:
Video
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 16, No. 1, Ed. 1 Friday, May 7, 1999
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
May 7, 1999
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library