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Composition and structure of sputter deposited erbium hydride thin films
Erbium hydride thin films are grown onto polished, a-axis {alpha} Al{sub 2}O{sub 3} (sapphire) substrates by reactive ion beam sputtering and analyzed to determine composition, phase and microstructure. Erbium is sputtered while maintaining a H{sub 2} partial pressure of 1.4 x 10{sup {minus}4} Torr. Growth is conducted at several substrate temperatures between 30 and 500 C. Rutherford backscattering spectrometry (RBS) and elastic recoil detection analyses after deposition show that the H/Er areal density ratio is approximately 3:1 for growth temperatures of 30, 150 and 275 C, while for growth above {approximately}430 C, the ratio of hydrogen to metal is closer to 2:1. However, x-ray diffraction shows that all films have a cubic metal sublattice structure corresponding to that of ErH{sub 2}. RBS and Auger electron that sputtered erbium hydride thin films are relatively free of impurities.
Date:
May 10, 2000
Creator:
Adams, David P.; Romero, Juan A.; Rodriguez, Mark A.; Floro, Jerrold A. & Banks, James C.
Object Type:
Article
System:
The UNT Digital Library
Experience with copper oxide production in antiproton source components at Fermi National Accelerator Laboratory
The Antiproton (Pbar) Source at Fermi National Accelerator Laboratory is a facility comprised of a target station, two rings called the Debuncher and Accumulator and the transport lines between those rings and the remainder of the particle accelerator complex. Water is by far the most common medium for carrying excess heat away from components, primarily electromagnets, in this facility. The largest of the water systems found in Pbar is the 95 degree Fahrenheit Low Conductivity Water (LCW) system. LCW is water which has had free ions removed, increasing its resistance to electrical current. This water circuit is used to cool magnets, power supplies, and stochastic cooling components and typically has a resistivity of 11--18 megaohms-cm. For more than ten years the Antiproton rings were plagued with overheating magnets due to plugged water-cooling channels. Various repairs have been tried over the years with no permanent success. Throughout all of this time, water samples have indicated copper oxide, CuO, as the source of the contamination. Matters came to a head in early 1997 following a major underground LCW leak between the Central Utilities Building and the Antiproton Rings enclosures. Over a span of several weeks following system turn-on, some twenty magnets overheated …
Date:
May 10, 2000
Creator:
Ader, Christine R.; Jr., Elvin R. Harms & Morgan, and James P.
Object Type:
Article
System:
The UNT Digital Library
Investigation of Mixed Metal Sorbent / Catalysts for the Simultaneous Removal of Sulfur and Nitrogen Oxides
Simultaneous removal of SO{sub 2} and NO{sub x} using a regenerable solid sorbent will constitute an important improvement over the use of separate processes for the removal of these two pollutants from stack gases and possibly eliminate several shortcomings of the individual SO{sub 2} and NO{sub x} removal operations. The work done at PETC and the DOE-funded investigation of the investigators on the sulfation and regeneration of alumina-supported cerium oxide sorbents have shown that they can perform well at relatively high temperatures (823-900 K) as regenerable desulfurization sorbents. Survey of the recent literature shows that addition of copper oxide to ceria lowers the sulfation temperature of ceria down to 773 K, sulfated ceria-based sorbents can function as selective SCR catalysts even at elevated temperatures, SO{sub 2} can be directly reduced to sulfur by CO on CuO-ceria catalysts, and ceria-based catalysts may have a potential for selective catalytic reduction of NO{sub x} by methane. These observations indicate a possibility of developing a ceria-based sorbent/catalyst which can remove both SO{sub 2} and NO{sub x} from flue gases within a relatively wide temperature window, produce significant amounts of elemental sulfur during regeneration, and use methane for the selective catalytic reduction of NO{sub x}. …
Date:
April 10, 2000
Creator:
Akyurtlu, Ates & Akyurtlu, Jale F.
Object Type:
Report
System:
The UNT Digital Library
Tanks Focus Area Site Needs Assessment FY 2000
This document summarizes the Tanks Focus Area (TFA's) process of collecting, analyzing, and responding to high-level radioactive tank waste science and technology needs developed from across the DOE complex in FY 2000. The document also summarizes each science and technology need, and provides an initial prioritization of TFA's projected work scope for FY 2001 and FY 2002.
Date:
March 10, 2000
Creator:
Allen, Robert W.
Object Type:
Report
System:
The UNT Digital Library
The effect of bulk composition on swelling and radiation-induced segregation in austenitic alloys.
None
Date:
October 10, 2000
Creator:
Allen, T. R.; Cole, J. I.; Dietz, N. L.; Wang, Y.; Was, G. S. & Kenik, E. A.
Object Type:
Article
System:
The UNT Digital Library
Color transparency and pion valence quark distributions from di-jet events in Fermilab E791
Diffractive, exclusive di-jet events produced by 500 GeV/c {pi}{sup {minus}} scattered off nuclei were used to measure their A-dependence, and to make the first direct measurement of the valence-quark momentum distribution in pions. Data on the latter are compared to two limiting predictions for the pion light-cone wave-function. The results show that the asymptotic wave-function of perturbative QCD describes the data well for Q{sup 2} of 10 GeV{sup 2} and above. The measured A-dependence is consistent with observation of point-like configurations in the pion and color-transparency calculations.
Date:
October 10, 2000
Creator:
Appel, Jeffrey A.
Object Type:
Article
System:
The UNT Digital Library
Neutrino masses at v3/2
Theories in which neutrino masses are generated by a conventional see-saw mechanism generically yield masses which are O(v{sup 2}) in units where M{sub Pl} = 1, which is naively too small to explain the results from SuperKamiokande. In supersymmetric theories with gravity mediated supersymmetry breaking, the fundamental small parameter is not v/M{sub Pl}, but m{sub I}/M{sub Pl}, where m{sub I} is the scale of supersymmetry breaking in the hidden sector. We note that m{sub I}{sup 3}/M{sub Pl}{sup 2} is only slightly too large to explain SuperKamiokande, and present two models that achieve neutrino masses at this order in m{sub I}, one of which has an additional suppression {lambda}{sub {tau}}{sup 2}, while the other has additional suppression arising from a loop factor. The latter model shares a great deal of phenomenology with a class of models previously explored, including the possibility of viable sneutrino dark matter.
Date:
October 10, 2000
Creator:
Arkani-Hamed, Nima; Hall, Lawrence; Murayama, Hitoshi; Smith,David & Weiner, Neal
Object Type:
Report
System:
The UNT Digital Library
Tank 241-SY-102 February 2000 Compatibility Grab Samples Analytical Results for the Final Report [SEC 1 Thru SEC 3]
None
Date:
July 10, 2000
Creator:
BELL, K.E.
Object Type:
Report
System:
The UNT Digital Library
Today Cedar Hill (Duncanville, Tex.), Vol. 35, No. 20, Ed. 1 Thursday, August 10, 2000
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
August 10, 2000
Creator:
Balentine, Kevin
Object Type:
Newspaper
System:
The Portal to Texas History
The use of rotating shadowband radiometers and microwave radiometers to obtain cloud properties in arctic environments.
None
Date:
October 10, 2000
Creator:
Barnard, J. C.; Liljegren, J. C.; Min, Q. L. & Doran, J. C.
Object Type:
Article
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 42, No. 6, Ed. 1 Thursday, February 10, 2000
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 10, 2000
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
News Bulletin (Castroville, Tex.), Vol. 42, No. 32, Ed. 1 Thursday, August 10, 2000
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 10, 2000
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
BF 4912 - Huey II: The Legend Continues
Promotional film for the Huey II upgrade package for the UH-1 helicopter.
Date:
August 10, 2000
Creator:
Bell Helicopter Textron
Object Type:
Video
System:
The UNT Digital Library
Paying Down the Federal Debt: A Discussion of Methods
None
Date:
August 10, 2000
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Value-Added Tax as a New Revenue Source
Some Members of Congress have expressed interest in the feasibility of using a value-added tax (VAT) to either replace all or part of the income tax or finance health care reform. A VAT is imposed at all levels of production on the differences between firms' sales and their purchases from all other firms. Policymakers may be interested in the following aspects of a VAT: revenue yield, international comparison of composition of taxes, vertical equity, neutrality, inflation, balance-of-trade, national saving, administrative cost, intergovernmental relations, size of government, and public opinion.
Date:
July 10, 2000
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Nanocluster formation during ion irradiation of SiO{sub 2}Ag/SiO{sub 2} multilayers.
None
Date:
October 10, 2000
Creator:
Birtcher, R. C.; Donnelly, S. E.; Rehn, L. E. & Thome, L.
Object Type:
Article
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 70, No. 39, Ed. 1 Tuesday, October 10, 2000
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
October 10, 2000
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Dark matter distribution in the universe and ultra-high energy cosmic rays
Two of the greatest mysteries of modern physics are the origin of the dark matter in the universe and the nature of the highest energy particles in the cosmic ray spectrum. The authors discuss here possible direct and indirect connections between these two problems, with particular attention to two cases: in the first they study the local clustering of possible sources of ultra-high energy cosmic rays (UHECRs) driven by the local dark matter overdensity. In the second case they study the possibility that UHECRs are directly generated by the decay of weakly unstable super heavy dark matter.
Date:
October 10, 2000
Creator:
Blasi, Pasquale
Object Type:
Article
System:
The UNT Digital Library
COPS: Large-scale nonlinearly constrained optimization problems
The authors have started the development of COPS, a collection of large-scale nonlinearly Constrained Optimization Problems. The primary purpose of this collection is to provide difficult test cases for optimization software. Problems in the current version of the collection come from fluid dynamics, population dynamics, optimal design, and optimal control. For each problem they provide a short description of the problem, notes on the formulation of the problem, and results of computational experiments with general optimization solvers. They currently have results for DONLP2, LANCELOT, MINOS, SNOPT, and LOQO.
Date:
February 10, 2000
Creator:
Bondarenko, A. S.; Bortz, D. M. & More, J. J.
Object Type:
Report
System:
The UNT Digital Library
University Press (Beaumont, Tex.), Vol. 76, No. 39, Ed. 1 Friday, March 10, 2000
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
March 10, 2000
Creator:
Bordeman, Christina
Object Type:
Newspaper
System:
The Portal to Texas History
Grandview Tribune (Grandview, Tex.), Vol. 105, No. 30, Ed. 1 Friday, March 10, 2000
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
March 10, 2000
Creator:
Bosher, Casey & Marten, Donna K.
Object Type:
Newspaper
System:
The Portal to Texas History
Grandview Tribune (Grandview, Tex.), Vol. 106, No. 13, Ed. 1 Friday, November 10, 2000
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
November 10, 2000
Creator:
Bosher, Casey & Marten, Donna K.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 105, No. 29, Ed. 1 Thursday, February 10, 2000
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 10, 2000
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 106, No. 3, Ed. 1 Thursday, August 10, 2000
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 10, 2000
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History