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395 Matching Results
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The Baytown Sun (Baytown, Tex.), Vol. 78, No. 273, Ed. 1 Saturday, August 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 305, Ed. 1 Tuesday, September 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 335, Ed. 1 Thursday, October 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 366, Ed. 1 Sunday, November 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 30, Ed. 1 Tuesday, December 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Computer modeling of temperature prediction for electroconsolidation.
None
Date:
June 26, 2000
Creator:
Chang, F.-C.; Fessler, R. R.; Merkle, B. D.; Borton, J. M. & Goldberger
Object Type:
Article
System:
The UNT Digital Library
Single Transverse Mode Selectively Oxidized Vertical Cavity Lasers
Vertical cavity surface emitting lasers (VCSELs) which operate in multiple transverse optical modes have been rapidly adopted into present data communication applications which rely on multi-mode optical fiber. However, operation only in the fundamental mode is required for free space interconnects and numerous other emerging VCSEL applications. Two device design strategies for obtaining single mode lasing in VCSELs based on mode selective loss or mode selective gain are reviewed and compared. Mode discrimination is attained with the use of a thick tapered oxide aperture positioned at a longitudinal field null. Mode selective gain is achieved by defining a gain aperture within the VCSEL active region to preferentially support the fundamental mode. VCSELs which exhibit greater than 3 mW of single mode output power at 850 nm with mode suppression ratio greater than 30 dB are reported.
Date:
April 26, 2000
Creator:
Choquette, Kent D.; Geib, Kent M.; Briggs, Ronald D.; Allerman, Andrew A. & Hindi, Jana Jo
Object Type:
Article
System:
The UNT Digital Library
Absorptance Measurements of Optical Coatings - A Round Robin
An international round robin study was conducted on the absorption measurement of laser-quality coatings. Sets of optically coated samples were made by a ''reactive DC magnetron'' sputtering and an ion beam sputtering deposition process. The sample set included a high reflector at 514 nm and a high reflector for the near infrared (1030 to 1318 nm), single layers of silicon dioxide, tantalum pentoxide, and hafnium dioxide. For calibration purposes, a sample metalized with hafnium and an uncoated, superpolished fused silica substrate were also included. The set was sent to laboratory groups for absorptance measurement of these coatings. Whenever possible, each group was to measure a common, central area and another area specifically assigned to the respective group. Specific test protocols were also suggested in regards to the laser exposure time, power density, and surface preparation.
Date:
October 26, 2000
Creator:
Chow, R; Taylor, J R; Wu, Z L; Boccara, C A; Broulik, U; Commandre, M et al.
Object Type:
Article
System:
The UNT Digital Library
Special Analysis for Disposal of High-Concentration I-129 Waste in the Intermediate-Level Vaults at the E-Area Low-Level Waste Facility
This revision was prepared to address comments from DOE-SR that arose following publication of revision 0. This Special Analysis (SA) addresses disposal of wastes with high concentrations of I-129 in the Intermediate-Level (IL) Vaults at the operating, low-level radioactive waste disposal facility (the E-Area Low-Level Waste Facility or LLWF) on the Savannah River Site (SRS). This SA provides limits for disposal in the IL Vaults of high-concentration I-129 wastes, including activated carbon beds from the Effluent Treatment Facility (ETF), based on their measured, waste-specific Kds.
Date:
September 26, 2000
Creator:
Collard, L.B.
Object Type:
Report
System:
The UNT Digital Library
The Message, Volume 36, May 26, 2000
Newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants.
Date:
May 26, 2000
Creator:
Congregation Beth Yeshurun (Houston, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Liberia: Current Issues and United States Policy
None
Date:
September 26, 2000
Creator:
Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
Update on the National Center for Gear Metrology
Traceability to national or international standards is clearly required by commercial sector standards including ISO 9001:1994 (Ref. 1), ISO/IEC Guide 25 (Ref. 2), and the US equivalent of ISO/IEC Guide 25-ANSI/NCSL Z540-2-1997 (Ref. 3). In the draft replacement to ISO/IEC Guide 25-ISO 17025; measurements, not just equipment, must be traceable to SI units or reference to a natural constant. The implications of traceability to the US gear industry are significant. In order to meet the standards, either gear manufacturers must have calibrated artifacts or must establish their own traceability to SI units.
Date:
September 26, 2000
Creator:
Cox, B. L.
Object Type:
Article
System:
The UNT Digital Library
Review of Waste Retrieval Sluicing System Operations and Data for Tanks 241-C-106 and 241-AY-102
None
Date:
September 26, 2000
Creator:
Cuta, J. M.; Carothers, K. G.; Damschen, D. W.; Kuhn, W. L.; Lechelt, J. A.; Sathyanarayana, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Review of Waste Retrieval Sluicing System Operations and Data for Tanks 241-C-106 and 241-AY-102
Sluicing operations were performed to retrieve high-heat sludge from single-shell tank 241-C-106 and transfer it to double-shell tank 241-AY-102 using the Waste Retrieval Sluicing System. This eliminated the high-heat safety issue for C-106 and demonstrated a technology for retrieval of single-shell tank waste. Both AY-102 and C-106 were monitored during the waste transfer operations, providing a clear picture of general trends in each tank. Specific issues addressed were evaluation of the data for evidence of flammable gas accumulation in AY-102 and thermal performance of AY-102 under the increasing heat load.
Date:
September 26, 2000
Creator:
Cuta, Judith M.; Carothers, Kelly G.; Damschen, Dennis W.; Kuhn, William L.; Lechelt, Jeanne A.; Sathyanarayana, Kurabalakota et al.
Object Type:
Report
System:
The UNT Digital Library
Plutonium Finishing Plant (PFP) HVAC System Component Index
This document lists safety class (SC) and safety significant (SS) components for the Heating Ventilation Air Conditioning (HVAC) and specifies the critical characteristics for Commercial Grade Items (CGI), as required by HNF-PRO-268 and HNF-PRO-1819. These are the minimum specifications that the equipment must meet in order to properly perform its safety function. There may be several manufacturers or models that meet the critical characteristics for any one item.
Date:
July 26, 2000
Creator:
DIAZ, E.N. & DICK, J.D.
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY2001: Defense
Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year. It is designed to supplement the information provided by the House and Senate Defense Appropriations Subcommittees.
Date:
September 26, 2000
Creator:
Daggett, Stephen
Object Type:
Report
System:
The UNT Digital Library
Summary of ACSL Simulations of the MSRE Auxiliary Charcoal Bed Vacuum System
The simulation of the Auxiliary Charcoal Bed (ACB) Vacuum System was performed to evaluate the original vacuum system design, detect and identify design deficiencies, investigate the effects of proposed corrections on system performance, and generally aid in refining the system design before construction and mockup testing. The simulation was performed by using the Advanced Continuous Simulation Language (ACSL). The vacuum system design goals are to provide approximately 20 SCFM of both booster gas and purge gas through the system and maintain a flow of approximately 40 SCFM with a velocity of 50 to 75 f/sec at the entrance to the cyclone separator. The model results showed that the original system design was incapable of meeting the system performance goals. Further simulations showed that the following modifications to the original vacuum system design were required to make the system performance acceptable; (1) Remove valve PCV4. (2) Modify the flow controllers FTC3 and FTC4 from the original flow range of 0-17.6 SCFM (0-500 SLM) to 0-35.3 SCFM (0-1000 SLM). (3) Replace the bellows sealed valves SV-1, SV-3A, SV-3B, SV-4A, and SV-4B with less restrictive ball valves. The simulation results saved considerable time and effort by identifying flaws in the original system design. …
Date:
October 26, 2000
Creator:
Damiano, B
Object Type:
Report
System:
The UNT Digital Library
[Fax: Letter from Al Daniels]
Cover sheet for a fax sent from Al Daniels to Tim McMullen including a message: "Congratulations Tim on being our new President. Attached is a new Directors list, Minutes of our 11-21-99 meeting, and proposed Bylaws. Please review and give me a call."
Date:
January 26, 2000
Creator:
Daniels, Al
Object Type:
Letter
System:
The UNT Digital Library
Long wavelength GaN blue laser (400-490nm) development
Room temperature (RT) pulsed operation of blue nitride based multi-quantum well (MQW) laser diodes grown on c-plane sapphire substrates was achieved. Atmospheric pressure MOCVD was used to grow the active region of the device which consisted of a 10 pair In{sub 0.21}Ga{sub 0.79}N (2.5nm)/In{sub 0.07}Ga{sub 0.93}N (5nm) InGaN MQW. The threshold current density was reduced by a factor of 2 from 10 kA/cm{sup 2} for laser diodes grown on sapphire substrates to 4.8 kA/cm{sub 2} for laser diodes grown on lateral epitaxial overgrowth (LEO) GaN on sapphire. Lasing wavelengths as long as 425nm were obtained. LEDs with emission wavelengths as long as 500nm were obtained by increasing the Indium content. These results show that a reduction in nonradiative recombination from a reduced dislocation density leads to a higher internal quantum efficiency. Further research on GaN based laser diodes is needed to extend the wavelength to 490nm which is required for numerous bio-detection applications. The GaN blue lasers will be used to stimulate fluorescence in special dye molecules when the dyes are attached to specific molecules or microorganisms. Fluorescein is one commonly used dye molecule for chemical and biological warfare agent detection, and its optimal excitation wavelength is 490 nm. InGaN …
Date:
October 26, 2000
Creator:
DenBaars, S. P.; Abare, A.; Sink, K.; Kozodoy, P.; Hansen, M.; Bowers, J. et al.
Object Type:
Report
System:
The UNT Digital Library
Commercial cokes and graphites as anode materials for lithium - ion cells
Several types of carbonaceous materials from Superior Graphite Co. were investigated for lithium ion intercalation. These commercially available cokes, graphitized cokes and graphites have a wide range of physical and chemical properties. The coke materials were investigated in propylene carbonate based electrolytes and the graphitic materials were studied in ethylene carbonate/dimethyl solutions to prevent exfoliation. The reversible capacities of disordered cokes are below 230 mAh/g and those for many highly ordered synthetic (artificial) and natural graphites approached 372 mAh/g (LiC{sub 6}). The irreversible capacity losses vary between 15 to as much as 200% of reversible capacities for various types of carbon. Heat treated cokes with the average particle size of 10 microns showed marked improvements in reversible capacity for lithium intercalation. The electrochemical characteristics are correlated with data obtained from scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM), X-ray diffraction (XRD) and BET surface area analysis. The electrochemical performance, availability, cost and manufacturability of these commercial carbons will be discussed.
Date:
October 26, 2000
Creator:
Derwin, D J; Kinoshita, K; Tran, T D & Zaleski, P
Object Type:
Article
System:
The UNT Digital Library
Critical current variation of Rutherford cable of Bi-2212 in high magnetic fields with transverse stress
None
Date:
February 26, 2000
Creator:
Dietderich, Daniel R.; Hasegawa, T.; Aoki, Y. & Scanlan, Ronald M.
Object Type:
Article
System:
The UNT Digital Library
Desorption Kinetics of H2O from Cab-O-Sil-M-7D and Hi-Sil-233 Silica Particles
Temperature programmed desorption (TPD) was performed at temperatures up to 850K on Cab-O-Sil-M-7D and Hi-Sil-233 silica particles. Physisorbed water molecules on both types of silica had activation energies in the range of 9-14.5 kcal/mol. However, the activation energies of desorption for chemisorbed water varied from {approx} 19 kcal/mol to > 59 kcal/mol for Cab-O-Sil-M-7D, and {approx} 23-37 kcal/mol for Hi-Sil-233. Our results suggest that physisorbed water can be effectively pumped away at room temperature (or preferably at 320 K) in a matter of hours. Chemisorbed water with high activation energies of desorption (>30 kcal/mol) will not escape the silica surfaces in 100 years even at 320 K, while a significant amount of the chemisorbed water with medium activation energies (19-26 kcal/mol) will leave the silica surfaces in that time span. Most of the chemisorbed water with activation energies < 30 kcal/mol can be pumped away in a matter of days in a good vacuum environment at 500 K. We had previously measured about 0.1-0.4 wt. % of water in M9787 polysiloxane formulations containing {approx} 21% Cab-O-Sil-M-7D and {approx} 4% Hi-Sil-233. Comparing present results with these formulations, we conclude that absorbed H{sub 2}O and Si-OH bonds on the silica surfaces are …
Date:
January 26, 2000
Creator:
Dinh, L.; Balooch, M. & LeMay, J.D.
Object Type:
Report
System:
The UNT Digital Library
The Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 29, Ed. 1 Wednesday, January 26, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 46, Ed. 1 Sunday, March 26, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
March 26, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History