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Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 21, No. 74, Ed. 1 Wednesday, December 15, 1999
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Luminescence Investigation of SiO2 Surfaces Damaged by 0.35 mm Laser Illumination
Following initiation at absorbing surface flaws, UV laser-induced damage to polished fused-silica surfaces continues to grow upon subsequent illumination. In this study photoluminescence spectroscopy was used to detect the formation of a modified, absorbing layer of silica that could be responsible for the continued growth of the damage site. For damage sites created with pulsed 355 nm illumination, three characteristic photoluminescence peaks are detected within the damage sites when excited with a 351 nm CW beam. Two of the peaks are likely due to the well-known E' and NBOHC defects associated with oxygen vacancies and broken Si-0 bonds, respectively. The third, and dominant, peak at 560 nm has not been clearly identified, but is likely associated with a change in stoichiometry of the silica. The relative intensities of the peaks are non-uniform across individual damage sites. The photoluminescence data is being combined with insights from various optical and electron microscopies to develop an understanding of laser-induced damage sites. The objective is to develop strategies to slow or stop the growth of the damage sites.
Date:
December 15, 1999
Creator:
Kozlowski, M.; Battersby, C.L. & Demos, S.G.
Object Type:
Article
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 18, No. 42, Ed. 1 Wednesday, December 15, 1999
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mannford Star (Mannford, Okla.), Vol. 6, No. 15, Ed. 1 Wednesday, December 15, 1999
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mechanical deformations and coherent transport in carbon nanotubes
Article on mechanical deformations and coherent transport in carbon nanotubes.
Date:
December 15, 1999
Creator:
Buongiorno Nardelli, Marco & Bernholc, Jerry
Object Type:
Article
System:
The UNT Digital Library
[Mentor Review: Meeting with Principal and Assistant Principal of Greenbriar School by Nancy Walkup]
A document about the mentorship review conducted by Nancy Walkup, providing valuable insights into her recent meeting with the Principal and Assistant Principal of Greenbriar School.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Mercedes Enterprise (Mercedes, Tex.), Vol. 87, No. 50, Ed. 1 Wednesday, December 15, 1999
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Microstructure and Performance of Kovar/Alumina Joints Made with Silver-Copper Base Active Metal Braze Alloys
Poor hermeticity performance was observed for Al{sub 2}O{sub 3}-Al{sub 2}O{sub 3} ceramic-ceramic joints having a Kovar{trademark} alloy interlayer. The active Ag-Cu-Ti filler metal was used to braze the substrates together. The Ti active element was scavenged from the filler metal by the formation of a (Fe, Ni, Co){sub x}Ti phase (x= 2-3) that prevented development of a continuous Ti{sub x}O{sub y} layer at the filler metal/Al{sub 2}O{sub 3} interface. Altering the process parameters did not circumvent the scavenging of Ti. Molybdenum barrier layers 1000, 2500, or 5000 {angstrom} thick on the Kovar{trademark} surfaces successfully allowed Ti{sub x}O{sub y} formation at the filler metal/Al{sub 2}O{sub 3} interface and hermetic joints. The problems with the Ag-Cu-Ti filler metal for Kovar{trademark}/Al{sub 2}O{sub 3} braze joints led to the evaluation of a Ag-Cu-Zr filler metal. The Zr (active element) in Ag-Cu-Zr filler metal was not susceptible to the scavenging problem.
Date:
December 15, 1999
Creator:
STEPHENS, JOHN J.; VIANCO,PAUL T.; HLAVA,PAUL F. & WALKER,CHARLES A.
Object Type:
Article
System:
The UNT Digital Library
Modeling solute redistribution and microstructural development in fusion welds of multi-component alloys
Solute redistribution and microstructural evolution have been modeled for gas tungsten arc fusion welds in experimental Ni base superalloys. The multi-component alloys were modeled as a pseudo-ternary {gamma}-Nb-C system. The variation in fraction liquid and liquid composition during the primary L {r{underscore}arrow} {gamma} and eutectic type L {r{underscore}arrow} ({gamma} + NbC) stages of solidification were calculated for conditions of negligible Nb diffusion and infinitely rapid C diffusion in the solid phase. Input parameters were estimated by using the Thermo-Calc NiFe Alloy data base and compared to experimentally determined solidification parameters. The solidification model results provide useful information for qualitatively interpreting the influence of alloy composition on weld microstructure. The quantitative comparisons indicate that, for the alloy system evaluated, the thermodynamic database provides sufficiently accurate values for the distribution coefficients of Nb and C. The calculated position of the {gamma}-NbC two-fold saturation line produces inaccurate results when used as inputs for the model, indicating further refinement to the database is needed for quantitative estimates.
Date:
December 15, 1999
Creator:
Dupont, J. N.; Robino, C. V. & Newbury, B. D.
Object Type:
Article
System:
The UNT Digital Library
Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal With Waste Materials
In this reporting period the authors have continued their investigation of bimetallic nitride and carbide compounds for use in coprocessing of coal and waste plastics or rubber. Following up on their finding of a class of bimetallic nitrides, reported in the last period, they now report on a new family of bimetallic oxycarbides M{sup I}-M{sup II}-O-C (M{sup I} = Mo, W; M{sup II} = V, Nb, Cr, Fe, Co, Ni). They have carried out a preliminary test of the compounds with a model coal liquid feed and find that, in general, these carbides are even more active than the nitrides. They have identified Nb-Mo-O-C as the most promising catalyst, and this catalyst together with Mo{sub 2}C, the most active single-metal carbide are being investigated for the coprocessing reaction. Comparison is made to standard sulfide catalysts. The latter reaction is carried out in batch autoclave systems, so that preliminary tests are first carried out with a simpler five-component feedstock. The feedstock is a multi-component model mixture that simulates the combined feed of coal and waste materials. The idea is to use different compounds that are specific for each reaction type but have no overlapping products. The proposed design involves a 5-component …
Date:
December 15, 1999
Creator:
Oyama, S.Ted; Cox, David F.; Song, Chunshan & Allen, Fred
Object Type:
Report
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 126, No. 100, Ed. 1 Wednesday, December 15, 1999
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 89, No. 100, Ed. 1 Wednesday, December 15, 1999
Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Penny Record (Bridge City, Tex.), Vol. 38, No. 29, Ed. 1 Wednesday, December 15, 1999
Weekly newspaper from Bridge City, Texas that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 106, No. 244, Ed. 1 Wednesday, December 15, 1999
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1113.0348]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Alan and Tracy Runge hold their daughter, Julia, as she looks at their Christmas tree"
Date:
December 15, 1999
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Radiolytic gas generation in crystalline silicotitanate slurries
This study measured the impact of crystalline silicotitanate (CST) solids on the rate of formation and composition of radiolytically generated gases in simulated Savannah River Site liquid waste.
Date:
December 15, 1999
Creator:
Walker, D. D.
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 79, Ed. 1 Wednesday, December 15, 1999
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 17, Ed. 1 Wednesday, December 15, 1999
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
December 15, 1999
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Size reduction machine
The Size Reduction Machine (SRM) is a mobile platform capable of shearing various shapes and types of metal components at a variety of elevations. This shearing activity can be performed without direct physical movement and placement of the shear head by the operator. The base unit is manually moved and roughly aligned to each cut location. The base contains the electronics: hydraulic pumps, servos, and actuators needed to move the shear-positioning arm. The movable arm allows the shear head to have six axes of movement and to cut to within 4 inches of a wall surface. The unit has a slick electrostatic capture coating to assist in external decontamination. Internal contamination of the unit is controlled by a high-efficiency particulate air (HEPA) filter on the cooling inlet fan. The unit is compact enough to access areas through a 36-inch standard door opening. This paper is an Innovative Technology Summary Report designed to provide potential users with the information they need to quickly determine if a technology would apply to a particular environmental management problem. They also are designed for readers who may recommend that a technology be considered by prospective users.
Date:
December 15, 1999
Creator:
Fricke, V.
Object Type:
Report
System:
The UNT Digital Library
Small Business Administration: A Review of SBA's Estimate of Impact of Legislative Proposals for the 7(a) Loan Guarantee Program
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Small Business Administration's (SBA) estimate of the impact of legislative proposals on the 7(a) Loan Guarantee Program, focusing on: (1) how SBA prepared estimates of H.R. 2615's impact on the average size and number of loans SBA makes; (2) ways that SBA could have improved its estimates; (3) how SBA analyzed the impact of the legislative proposals on the credit subsidy rate for the 7(a) loan program; and (4) ways to improve this analysis."
Date:
December 15, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
The Stress-Relief Cracking Susceptibility of a New Ferritic Steel - Part I: Single-Pass Heat-Affected Zone Simulations
The stress-relief cracking susceptibility of single-pass welds in a new ferritic steel, HCM2S, has been evaluated and compared to 2.25Cr-1Mo steel using Gleeble techniques. Simulated coarse-grained heat-affected zones (CGHAZ) were produced under a range of energy inputs and tested at various post-weld heat treatment (PWHT) temperatures. Both alloys were tested at a stress of 325 MPa. The 2.25 Cr-1Mo steel was also tested at 270 MPa to normalize for the difference in yield strength between the two materials. Light optical and scanning electron microscopy were used to characterize the CGHAZ microstructure. The ''as-welded'' CGHAZ of each alloy consisted of lath martensite or bainite and had approximately equal prior austenite grain sizes. The as-welded hardness of the 2.25Cr-1Mo steel CGHAZ was significantly higher than that of the HCM2S alloy. Over the range studied energy input had no effect on the as-welded microstructure or hardness of either alloy. The energy input also had no effect on the stress-relief cracking susceptibility of either material. Both alloys failed intergranularly along prior austenite grain boundaries under all test conditions. The 2.25Cr-1Mo steel samples experienced significant macroductility and some microductility when tested at 325 MPa. The ductility decreased significantly when tested at 270 MPa but was …
Date:
December 15, 1999
Creator:
Nawrocki, J. G.; DuPont, J. N.; Robino, Charles V. & Marder, A. R.
Object Type:
Article
System:
The UNT Digital Library
Sugar Policy Issues
None
Date:
December 15, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Tax Administration: IRS' 1999 Tax Filing Season
A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, the GAO discussed the Internal Revenue Service's (IRS) performance during the 1999 tax filing season, focusing on: (1) telephone service; (2) availability of walk-in services; (3) other taxpayer service efforts; (4) Earned Income Credit (EIC) noncompliance; (5) electronic filing; (6) implementation of recent tax law changes; and (7) implementation of a new return and remittance processing system."
Date:
December 15, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Thermal and Fluid Flow Brazing Simulations
The thermal response of fixtured parts in a batch-type brazing furnace can require numerous, time-consuming development runs before an acceptable furnace schedule or joint design is established. Powerful computational simulation tools are being developed to minimize the required number of verification experiments, improve furnace throughput, and increase product yields. Typical furnace simulations are based on thermal, fluid flow, and structural codes that incorporate the fundamental physics of the brazing process. The use of massively parallel computing to predict furnace and joint-level responses is presented. Measured and computed data are compared. Temperature values are within 1-270 of the expected peak brazing temperature for different loading conditions. Sensitivity studies reveal that the thermal response is more sensitive to the thermal boundary conditions of the heating enclosure than variability y in the materials data. Braze flow simulations predict fillet geometry and free surface joint defects. Dynamic wetting conditions, interfacial reactions, and solidification structure add a high degree of uncertainty to the flow results.
Date:
December 15, 1999
Creator:
Hosking, Floyd Michael; Gianolakis, Steven E.; Givler, Richard C. & Schunk, P. Randall
Object Type:
Article
System:
The UNT Digital Library