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Approaches to large scale unsaturated flow in heterogeneous, stratified, and fractured geologic media
This report develops a broad review and assessment of quantitative modeling approaches and data requirements for large-scale subsurface flow in radioactive waste geologic repository. The data review includes discussions of controlled field experiments, existing contamination sites, and site-specific hydrogeologic conditions at Yucca Mountain. Local-scale constitutive models for the unsaturated hydrodynamic properties of geologic media are analyzed, with particular emphasis on the effect of structural characteristics of the medium. The report further reviews and analyzes large-scale hydrogeologic spatial variability from aquifer data, unsaturated soil data, and fracture network data gathered from the literature. Finally, various modeling strategies toward large-scale flow simulations are assessed, including direct high-resolution simulation, and coarse-scale simulation based on auxiliary hydrodynamic models such as single equivalent continuum and dual-porosity continuum. The roles of anisotropy, fracturing, and broad-band spatial variability are emphasized. 252 refs.
Date:
August 1, 1991
Creator:
Ababou, R.
Object Type:
Report
System:
The UNT Digital Library
[Abilene City Resolutions: 1991]
Ledger containing ordinances/resolutions passed by the city of Abilene, Texas during calendar year 1991.
Date:
1991
Creator:
Abilene (Tex.)
Object Type:
Legal Document
System:
The Portal to Texas History
Catalog of Abilene Christian University, 1991-1992
Undergraduate catalog describes the governance, history, course offerings, and campus life of Abilene Christian University in Abilene, Texas.
Date:
1991~
Creator:
Abilene Christian University
Object Type:
Book
System:
The Portal to Texas History
Prickly Pear, Yearbook of Abilene Christian University, 1991
Yearbook for Abilene Christian University in Abilene, Texas includes photos of and information about the school, student body, professors, and organizations. Index starts on page 354.
Date:
1991
Creator:
Abilene Christian University
Object Type:
Yearbook
System:
The Portal to Texas History
Security guide for subcontractors
This security guide of the Department of Energy covers contractor and subcontractor access to DOE and Mound facilities. The topics of the security guide include responsibilities, physical barriers, personnel identification system, personnel and vehicular access controls, classified document control, protecting classified matter in use, storing classified matter repository combinations, violations, security education clearance terminations, security infractions, classified information nondisclosure agreement, personnel security clearances, visitor control, travel to communist-controlled or sensitive countries, shipment security, and surreptitious listening devices.
Date:
January 1, 1991
Creator:
Adams, R.C.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of weldments in Type 21-6-9 stainless steel for Compact Ignition Tokamak structural applications: Phase 1
Primary design considerations for the Compact Ignition Tokamak toroidal field-coil cases are yield strength and toughness in the temperature range from 77 to 300 K. Type 21-6-9 stainless steel, also still known by its original Armco Steel Company trade name Nitronic 40, is the proposed alloy for this application. It has high yield strength and usually adequate base metal toughness, but weldments in thick sections have not been adequately characterized in terms of mechanical properties or hot-cracking propensity. In this study, weldability of the alloy in heavy sections and the mechanical properties of the resultant welds were investigated including tensile yield strength and Charpy V-notch toughness at 77 K and room temperature. Weldments were made in four different base metals using seven different filler metals. None of the weldments showed any indication of hot-cracking problems. All base metals, including weldment heat-affected zones, were found to have adequate strength and impact toughness at both test temperatures. Weld metals, on the other hand, except ERNiCr-3 and ENiCrFe-3 had impact toughnesses of less than 67 J at 77 K. Inconel 82 had an average weld metal impact toughness of over 135 J at 77 K, and although its strength at 77 K is …
Date:
June 1, 1991
Creator:
Alexander, D. J.; Goodwin, G. M. & Bloom, E. E.
Object Type:
Report
System:
The UNT Digital Library
Experimental results of direct containment heating by high-pressure melt ejection into the Surtsey vessel: The DCH-3 and DCH-4 tests
Two experiments, DCH-3 and DCH-4, were performed at the Surtsey test facility to investigate phenomena associated with a high-pressure melt ejection (HPME) reactor accident sequence resulting in direct containment heating (DCH). These experiments were performed using the same experimental apparatus with identical initial conditions, except that the Surtsey test vessel contained air in DCH-3 and argon in DCH-4. Inerting the vessel with argon eliminated chemical reactions between metallic debris and oxygen. Thus, a comparison of the pressure response in DCH-3 and DCH-4 gave an indication of the DCH contribution due to metal/oxygen reactions. 44 refs., 110 figs., 43 tabs.
Date:
August 1, 1991
Creator:
Allen, M.D.; Pilch, M.; Brockmann, J.E.; Tarbell, W.W. (Sandia National Labs., Albuquerque, NM (United States)); Nichols, R.T. (Ktech Corp., Albuquerque, NM (United States)) & Sweet, D.W. (AEA Technology, Winfrith (United Kingdom))
Object Type:
Report
System:
The UNT Digital Library
Chemical Information Bulletin, Volume 43, Number 2, Summer 1991
Periodic supplement for "the regular journals of the American Chemical Society," containing annotated bibliographies of chemical documentation literature as well as information about meetings, conferences, awards, scholarships, and other news from the American Chemical Society (ACS) Division of Chemical Literature.
Date:
Summer 1991
Creator:
American Chemical Society. Division of Chemical Information.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Tracings, Volume 10, Number 1, January 1991
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
January 1991
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Tracings, Volume 10, Number 2, June 1991
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
June 1991
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Tracings, Volume 10, Number 3, October 1991
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
October 1991
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Nuclear models relevant to evaluation
The widespread use of nuclear models continues in the creation of data evaluations. The reasons include extension of data evaluations to higher energies, creation of data libraries for isotopic components of natural materials, and production of evaluations for radiative target species. In these cases, experimental data are often sparse or nonexistent. As this trend continues, the nuclear models employed in evaluation work move towards more microscopically-based theoretical methods, prompted in part by the availability of increasingly powerful computational resources. Advances in nuclear models applicable to evaluation will be reviewed. These include advances in optical model theory, microscopic and phenomenological state and level density theory, unified models that consistently describe both equilibrium and nonequilibrium reaction mechanism, and improved methodologies for calculation of prompt radiation from fission. 84 refs., 8 figs.
Date:
January 1, 1991
Creator:
Arthur, E. D.; Chadwick, M. B.; Hale, G. M. & Young, P. G.
Object Type:
Article
System:
The UNT Digital Library
The Hornet, Yearbook of Aspermont Students, 1991
Yearbook of students in Aspermont, Texas includes photographs of and information about the school, student body, teachers, and organizations.
Date:
1991
Creator:
Aspermont High School
Object Type:
Yearbook
System:
The Portal to Texas History
Journal of Advanced Composition, Volume 11, Number 2, 1991
The Journal of Advanced Composition contains a collection of papers regarding writing and rhetoric: "The JAC is a forum for theory, research and pedagogy regarding (1) those writing courses beyond the freshman courses, excluding technical and creative writing, (2) writing in courses which are not themselves writing courses, particularly in the liberal arts and sciences, and (3) work in theory, research or pedagogy which is advanced or progressive and will shed light on the field as a whole while at the same time providing insights for advanced composition" (volume 1, number 1).
Date:
1991
Creator:
Association of Teachers of Advanced Composition (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
A Texas Scrap-Book: Made up of the History, Biography, and Miscellany of Texas and its People
Re-print of a historical and biographical account of the earl history of Texas until around 1846; the book is divided into four parts: historical, biography, miscellany, and statistical. Index begins on page 659.
Date:
1991
Creator:
Baker, D. W. C. (De Witt Clinton), 1832-1881
Object Type:
Book
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 137, Ed. 1 Wednesday, April 10, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
April 10, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 139, Ed. 1 Friday, April 12, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
April 12, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 140, Ed. 1 Monday, April 15, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
April 15, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 141, Ed. 1 Tuesday, April 16, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
April 16, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 143, Ed. 1 Thursday, April 18, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
April 18, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 157, Ed. 1 Wednesday, May 8, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
May 8, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 159, Ed. 1 Friday, May 10, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
May 10, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 169, Ed. 1 Friday, May 24, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
May 24, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wave (Port Lavaca, Tex.), Vol. 100, No. 172, Ed. 1 Wednesday, May 29, 1991
Daily newspaper from Port Lavaca, Texas that includes local, state, and national news along with advertising.
Date:
May 29, 1991
Creator:
Bales, Steve & Fortney, Paul, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History