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58
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10
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Year
Month
Day
Language
Mechanical properties and microstructural characteristics of laser and electron-beam welds in V-4Cr-4Ti.
Mechanical properties and microstructural characteristics of laser and electron-beam welds of a 500-kg heat of V4Cr4Ti were investigated in as-welded condition and after postwelding heat treatment by impact testing, microhardness measurement, optical microscopy, X-ray diffraction, and transmission electron microscopy (TEM). Ductile-brittle transition temperatures of the laser and electron-beam welds were significantly higher than that of the base metal. However, excellent impact properties could be restored in both types of welds by postwelding annealing at 1000 C for 1 h in vacuum. Analysis by TEM revealed that annealed weld zones were characterized by extensive networks of fine V(C,O,N) precipitates, which clean away O, C, and N interstitial from the grain matrices. This process is accompanied by simultaneous annealing-out of the dense dislocations present in the weld zone. This finding could be useful in identifying an optimal welding procedure by controlling and adjusting the cooling rate of the weld zone by an innovative method to maximize the precipitation of V(C,O,N).
Date:
May 18, 1998
Creator:
Chung, H. M.
Object Type:
Article
System:
The UNT Digital Library
Tensile impact properties of vanadium-base alloys irradiated at <430{degree}C.
Tensile and impact properties were investigated at <430 C on V-Cr-Ti, V-Ti-Si, and V-Ti alloys after irradiation to {approx}2-46 dpa at 205-430 C in lithium or helium in the Fast Flux Test Facility (FFTF), High Flux Isotope Reactor (HFIR), Experimental Breeder Reactor II (EBR-II), and Advanced Test Reactor (ATR). A 500-kg heat of V-4Cr-4Ti exhibited high ductile-brittle transition temperature and minimal uniform elongation as a result of irradiation-induced loss of work-hardening capability. Work-hardening capabilities of 30- and 100-kg heats of V-4Cr-4Ti varied significantly with irradiation conditions, although the 30-kg heat exhibited excellent impact properties after irradiation at {approx}390-430 C. The origin of the significant variations in the work-hardening capability of V-4Cr-4Ti is not understood, although fabrication variables, annealing history, and contamination from the irradiation environment are believed to play important roles. A 15-kg heat of V-3Ti-1Si exhibited good work-hardening capability and excellent impact properties after irradiation at {approx}390-430 C. Helium atoms, either charged dynamically or produced via transmutation of boron in the alloys, promote work-hardening capability in V-4Cr-4Ti and V-3Ti-1Si.
Date:
May 18, 1998
Creator:
Chung, H. M.
Object Type:
Article
System:
The UNT Digital Library
De Leon's Monitor (De Leon, Tex.), Vol. 3, No. 50, Ed. 1 Thursday, June 18, 1998
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
June 18, 1998
Creator:
Chupp, Charles & Chupp Bouchier, Tracy
Object Type:
Newspaper
System:
The Portal to Texas History
Liner Stability Experiments at Pegasus: Diagnostics and Experimental Results
A series of experiments to compare imploding liner performance with magneto-hydrodynamic (MHD) modeling has been performed at the Los Alamos National Laboratory Pegasus II pulse power machine. Liner instability growth originating from initial perturbations machined into the liner has been observed with high resolution. Three major diagnostics were used: radiography, Velocity Interferometer for a Surface of Any Reflector (VISAR), and fiber optic impact pins. For radiography, three flash x-ray units were mounted radially to observe liner shape at three different times during the implosion. Liner velocity was measured continuously with the VISAR for the entire distance traveled in two experiments. Optical impact pins provide a high-resolution measure of liner symmetry and shape near the end of travel. Liner performance has compared well with predictions.
Date:
October 18, 1998
Creator:
Clark, D.A.; Morgan, D.V. & Rodriguez, G.
Object Type:
Article
System:
The UNT Digital Library
Language interoperability mechanisms for high-performance scientific applications
Language interoperability is a difficult problem facing the developers and users of large numerical software packages. Language choices often hamper the reuse and sharing of numerical libraries, especially in a scientific computing environment that uses a breadth of programming languages, including C, c ++, Java, various Fortran dialects, and scripting languages such as Python. In this paper, we propose a new approach to langauge interoparability for high-performance scientific applications based on Interface Definition Language (IDL) techniques. We investigate the modifications necessary to adopt traditional IDL approaches for use by the scientific community, including IDL extensions for numerical computing and issues involved in mapping IDLs to Fortran 77 and Fortran 90.
Date:
September 18, 1998
Creator:
Cleary, A.; Kohn, S.; Smith, S. G. & Smolinski, B.
Object Type:
Article
System:
The UNT Digital Library
Composite Liner, Multi-Megabar Shock Driver Development
The multi-megabar shock driver development is a series of experiments in support of the Los Alamos High Energy Density Physics Experimental Program. Its purpose is to develop techniques to impact a uniform, stable, composite liner upon a high Z target to produce a multi-megabar shock for EOS studies. To date, experiments have been done on the Pegasus II capacitor bank with a current of {approximately}12MA driving the impactor liner. The driving field is {approximately}200 T at the target radius of 1cm. Data will be presented on the impactor liner. The driving field is {approximately}200 T at the target radius of 1 cm. Data will be presented on the stability and uniformity of the impactor liner when it impacts the target cylinder. Three experiments have been done with emphasis on liner development. Shock pressures greater than a megabar have been done with emphasis on liner development. Shock pressures greater than a megabar have been produced with an Al target cylinder. A Pt target cylinder should produce shock pressures in th e 5-megabar range.
Date:
October 18, 1998
Creator:
Cochrane, J. C. Jr.; Bartsch, R. R.; Clark, D. A.; Morgan, D. V.; Anderson, W. E.; Lee, H. et al.
Object Type:
Article
System:
The UNT Digital Library
Atlas Pulsed Power System: a Driver for Multi-Megagauss Fields
Atlas is a pulsed power machine designed for hydrodynamic experiments for the Los Alamos High Energy Density Physics Experimental program. It is presently under construction and should be operational in late 2000. Atlas will store 23 MJ at an erected voltage of 240 kV. This will produce a current of 30 MA into a static load and as much as 32 MA into a dynamic load. The current pulse will have a rise time of {approximately}5{micro}s and will produce a magnetic field driving the impactor liner of several hundred Tesla at the target radius of one to two centimeters. The collision can produce shock pressures of {approximately}15 megabars. Design of the pulsed power system will be presented along with data obtained from the Atlas prototype Marx module.
Date:
October 18, 1998
Creator:
Cochrane, J. C.; Bartsch, R. R.; Bennett, G. A.; Bowman, D. W.; Davis, H. A.; Ekdahl, C. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 98, No. 258, Ed. 1 Sunday, January 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 98, No. 284, Ed. 1 Wednesday, February 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 4, Ed. 1 Wednesday, March 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 56, Ed. 1 Monday, May 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 84, Ed. 1 Thursday, June 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 133, Ed. 1 Tuesday, August 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 160, Ed. 1 Friday, September 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 185, Ed. 1 Sunday, October 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 213, Ed. 1 Wednesday, November 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 239, Ed. 1 Friday, December 18, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 18, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Final Report
Final report of the Commission on Structural Alternatives for the Federal Courts of Appeals describing their activities and findings regarding its recommendations for changes concerning structure and circuit boundaries in the federal appellate system.
Date:
December 18, 1998
Creator:
Commission on Structural Alternatives for the Federal Courts of Appeals
Object Type:
Report
System:
The UNT Digital Library
The Message, Volume 34, September 18, 1998
Semi-monthly newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants. This issue discusses Rosh Hashanah, the High Holy Day services, and upcoming Sukkot events.
Date:
September 18, 1998
Creator:
Congregation Beth Yeshurun (Houston, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Vortex melting and the liquid state in YBa{sub 2}Cu{sub 3}O{sub x}.
The experimental vortex phase diagram of YBa{sub 2}Cu{sub 3}O{sub x} is reviewed, with emphasis on first order vortex melting, the upper and lower critical points on the melting line, and the effect of disorder arising from twin boundary and point defect pinning.
Date:
November 18, 1998
Creator:
Crabtree, G. W.
Object Type:
Article
System:
The UNT Digital Library
Facility effluent monitoring plan for the tank farm facility
A facility effluent monitoring plan is required by the US Department of Energy in DOE Order 5400.1 for any operations that involve hazardous materials and radioactive substances that could impact employee or public safety or the environment. This document is prepared using the specific guidelines identified in A Guide for Preparing Hanford Site Facility Effluent Monitoring Plans, WHC-EP-0438. This facility effluent monitoring plan assesses effluent monitoring systems and evaluates whether they are adequate to ensure the public health and safety as specified in applicable federal, state, and local requirements.
Date:
May 18, 1998
Creator:
Crummel, G. M.
Object Type:
Report
System:
The UNT Digital Library
TART97 installation
This document contains detailed instructions for the installation of the TART97 software.
Date:
May 18, 1998
Creator:
Cullen, D.E.
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY1999: Defense
This report is a guide to appropriations of Defense for FY1999.
Date:
December 18, 1998
Creator:
Dagget, Stephen
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY1999: 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 CRS reports that provide analytical perspectives on the 13 annual appropriations bills, and other related appropriation measures. It does not include a detailed explanation or description of the budget or appropriations processes. It is designed to supplement the information provided by the House and Senate Defense Appropriations Subcommittees.
Date:
December 18, 1998
Creator:
Daggett, Stephen
Object Type:
Report
System:
The UNT Digital Library