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Advanced Low-Temperature Fluid Bed Sorbents

Description: This paper discusses the results obtained in an ongoing study geared towards developing advanced mixed-metal oxide sorbents for desulfurization of coal-derived fuel gases in the temperature range of 350 to 550{degrees}C. The paper focuses on the study related to the development of durable sorbents suitable for fluidized-bed application and addresses thermodynamic considerations, sulfidation kinetics, regenerability, and the physical and chemical characteristics of a number of novel sorbents.
Date: December 31, 1996
Creator: Abbasian, J.; Slimane, R. B. & Wangerow, J. R.
Partner: UNT Libraries Government Documents Department
open access

Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200GeV

Description: We present strange particle spectra and yields measured atmid-rapidity in sqrt text s=200 GeV proton-proton (p+p) collisions atRHIC. We find that the previously observed universal transverse mass(mathrm mT \equiv\sqrt mathrm p_T 2+\mathrm m2) scaling of hadronproduction in p+p collisions seems to break down at higher \mt and thatthere is a difference in the shape of the \mt spectrum between baryonsand mesons. We observe mid-rapidity anti-baryon to baryon ratios nearunity for Lambda and Xi baryo… more
Date: July 31, 2006
Creator: Abelev, B. I.; Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Partner: UNT Libraries Government Documents Department
open access

The Nimrod computational workbench: a case study in desktop metacomputing

Description: The coordinated use of geographically distributed computers, or metacomputing, can in principle provide more accessible and cost- effective supercomputing than conventional high-performance systems. However, we lack evidence that metacomputing systems can be made easily usable, or that there exist large numbers of applications able to exploit metacomputing resources. In this paper, we present work that addresses both these concerns. The basis for this work is a system called Nimrod that provide… more
Date: December 31, 1996
Creator: Abramson, D.; Sosic, R.; Foster, I.; Giddy, J.; Lewis, A. & White, N.
Partner: UNT Libraries Government Documents Department
open access

Chronic lung injury risk estimates for urban areas having ozone patterns similar to those in the Northeast

Description: This paper describes the approach and result of an assessment of health risks associated with long-term exposure to ozone. The health endpoint of interest is the probability of formation of mild lesions in the centriacinar region of the lung among children living in New York City. The risk model incorporates an exposure model and a health model. The exposure model is preliminary results of the probabilistic NAAQS Exposure Model (P-NEM) for ozone, and the health model is the judgments of active … more
Date: December 31, 1991
Creator: Absil, M.; Narducci, P.; Whitfield, R. & Richmond, H. M.
Partner: UNT Libraries Government Documents Department
open access

Kahler Independence of the G2-MSSM

Description: The G{sub 2}-MSSM is a model of particle physics coupled to moduli fields with interesting phenomenology both for colliders and astrophysical experiments. In this paper we consider a more general model--whose moduli Kahler potential is a completely arbitrary G{sub 2}-holonomy Kahler potential and whose matter Kahler potential is also more general. We prove that the vacuum structure and spectrum of BSM particles is largely unchanged in this much more general class of theories. In particular, gau… more
Date: October 31, 2008
Creator: Acharya, Bobby S. & Bobkov, Konstantin
Partner: UNT Libraries Government Documents Department
open access

Redefining design criteria for Pu-238 gloveboxes

Description: Enclosures for confinement of special nuclear materials (SNM) have evolved into the design of gloveboxes. During the early stages of glovebox technology, established practices and process operation requirements defined design criteria. Proven boxes that performed and met or exceeded process requirements in one group or area, often could not be duplicated in other areas or processes, and till achieve the same success. Changes in materials, fabrication and installation methods often only met imme… more
Date: December 31, 1998
Creator: Acosta, S.V.
Partner: UNT Libraries Government Documents Department
open access

Activity Coefficients at Infinite Dilution for Organic Compounds Dissolved in 1-Alkyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquids Having Six-, Eight-, and Ten-Carbon Alkyl Chains

Description: Article on activity coefficients at infinite dilution for organic compounds dissolved in 1-alkyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquids having six-, eight-, and ten-carbon alkyl chains.
Date: October 31, 2012
Creator: Acree, William E. (William Eugene); Baker, Gary A.; Revelli, Anne-Laure; Moïse, Jean-Charles & Mutelet, Fabrice
Partner: UNT College of Arts and Sciences
open access

Construction features of the exploratory shaft at Yucca Mountain

Description: The Exploratory Shaft (ES) at Yucca Mountain is planned to be constructed during 1985 and 1986 as part of the detailed site characterization for one of three sites which may be selected as candidates for location of a high-level radioactive waste repository. Conventional mining methods will be used for the shaft sinking phase of the ES project. The ES will be comprised of surface support facilities, a 1480-ft-deep circular shaft lined with concrete to a finished inside diameter of 12 ft, latera… more
Date: December 31, 1984
Creator: Adair, G.W. & Fiore, J.N.
Partner: UNT Libraries Government Documents Department
open access

Environmental impacts of ocean disposal of CO{sub 2}

Description: This project has examined the impacts from the marine disposal of carbon dioxide based on the current state of knowledge.
Date: December 31, 1995
Creator: Adams, E.; Herzog, H.; Auerbach, D. & Caulfield, J.
Partner: UNT Libraries Government Documents Department
open access

Comparison between S/1 and R/1 tests and damage density vs. fluence (rho(phi)) results for unconditioned and sub-nanosecond laser-conditioned KD2PO4 crystals

Description: We present S/1 and R/1 test results on unconditioned and 355 nm (3{omega}), 500 ps laser conditioned DKDP. We find up to {approx}2.5X improvement in fluence in the S/1 performance after 3{omega}, 500 ps conditioning to 5 J/cm{sup 2}. For the first time, we observe a shift to higher fluences in the R/1 results for DKDP at 3{omega}, 7 ns due to 500 ps laser conditioning. The S/1 results are compared to {rho}({phi}) results previously measured on the same DKDP crystal [1]. A consistent behavior in… more
Date: October 31, 2007
Creator: Adams, J. J.; Jarboe, J.; Feit, M. & Hackel, R.
Partner: UNT Libraries Government Documents Department
open access

An analytical assessment of the chemical form of fission products during postulated severe accidents in the SRS production reactors

Description: An analysis has been performed to determine the principal chemical forms for the structural and fission product elements during a postulated severe core damage accident in tritium powered core in the Savannah River Site (SRS) reactors. These reactors are powered with UAl{sub x} fuel and are used for the production of weapons materials. Six core elements, cesium, iodine, tellurium, strontium, barium, and lithium, were emphasized in this analysis. Other elements also included were aluminum, hydro… more
Date: December 31, 1991
Creator: Adams, J. P.
Partner: UNT Libraries Government Documents Department
open access

Fission product transport and behavior during two postulated loss of flow transients in the air

Description: This document discusses fission product behavior during two postulated loss-of-flow accidents (leading to high- and low-pressure core degradation, respectively) in the Advanced Test Reactor (ATR). These transients are designated ATR Transient LCPI5 (high-pressure) and LPP9 (low-pressure). Normally, transients of this nature would be easily mitigated using existing safety systems and procedures. In these analyses, failure of these safety systems was assumed so that core degradation and fission p… more
Date: December 31, 1991
Creator: Adams, J. P. & Carboneau, M. L.
Partner: UNT Libraries Government Documents Department
open access

Multi-strange baryon production in Au-Au collisions at sqrt(sNN) = 130 GeV

Description: The transverse mass spectra and mid-rapidity yields for {Xi}s and {Omega}s plus their anti-particles are presented. The 10% most central collision yields suggest that the amount of multi-strange particles produced per produced charged hadron increases from SPS to RHIC energies. A hydrodynamically inspired model fit to the spectra, which assumes a thermalized source, seems to indicate that these multi-strange particles experience a significant transverse flow effect, but are emitted when the sys… more
Date: July 31, 2003
Creator: Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Partner: UNT Libraries Government Documents Department
open access

Critical Protection Item Classification for a waste processing facility at Savannah River Site. Revision 1

Description: As a part of its compliance with the Department of Energy requirements for safety of nuclear facilities at the Savannah River Site (SRS), Westinghouse Savannah River Company (WSRC) assigns functional classifications to structures, systems and components (SSCs). As a result, changes in design, operations, maintenance, testing, and inspections of SSCs are performed and backfit requirements are established. This paper describes the Critical Protection Item (CPI) Classification for waste processing… more
Date: December 31, 1993
Creator: Ades, M. J. & Garrett, R. J.
Partner: UNT Libraries Government Documents Department
open access

Deflagration-induced pressure and temperature transients in a waste storage facility

Description: This paper presents a study for a facility where a deflagration of flammable vapors takes place, and the generated pressure and temperature transients are analyzed to evaluate the pressure differentials induced on the various components of the facility to assesses their structural integrity. The temperature profiles are also analyzed to assess the qualification of the equipment that is required to operate during and after such an accident.
Date: December 31, 1995
Creator: Ades, M. J. & Polizzi, L. M.
Partner: UNT Libraries Government Documents Department
open access

Silicon heat pipes for cooling electronics

Description: The increasing power density of integrated circuits (ICs) is creating the need for improvements in systems for transferring heat away from the chip. In earlier investigations, diamond films were used to conduct heat from ICs and spread the energy across a heat sink. The authors` investigation has indicated that a 635 {mu}m (25 mil) thick silicon substrate with embedded heat pipes could perform this task better than a diamond film. From their study, it appears that the development of a heat-pipe… more
Date: December 31, 1994
Creator: Adkins, D. R.; Shen, D. S.; Palmer, D. W. & Tuck, M. R.
Partner: UNT Libraries Government Documents Department
open access

Atomic structure of active sites in O{sub 2} reduction on Au(111)/Tl{sub ad} electrodes in acid and alkaline solutions

Description: Surface x-ray scattering has been used to determine the structure of Tl adlayers on the Au(111) electrode surface during the course of 0{sub 2} reduction. 0. reduction is considerably catalyzed by Ti adlayers on Au(111). The half-wave potential is shifted to more positive values in the presence of the Ti adlayer. In both, acid and alkaline solutions TI causes a change in the reaction mechanism from a 2-ereduction to a 4e-reduction in a limited potential range. The in-plane X-ray diffraction mea… more
Date: December 31, 1995
Creator: Adzic, R. R. & Wang, J. X.
Partner: UNT Libraries Government Documents Department
open access

Timelike Virtual Compton Scattering from Electron-Positron Radiative Annihilation

Description: We propose measurements of the deeply virtual Compton amplitude (DVCS) {gamma}* {yields} H{bar H}{gamma} in the timelike t = (p{sub H} + p{sub {bar H}}){sup 2} > 0 kinematic domain which is accessible at electron-positron colliders via the radiative annihilation process e{sup +}e{sup -} {yields} H{bar H}{gamma}. These processes allow the measurement of timelike deeply virtual Compton scattering for a variety of H{bar H} hadron pairs such as {pi}{sup +}{pi}{sup -}, K{sup +}K{sup -}, and D{bar… more
Date: March 31, 2009
Creator: Afanasev, Andrei; Brodsky, Stanley J.; Carlson, Carl E. & Mukherjee, Asmita
Partner: UNT Libraries Government Documents Department
open access

Structural characterization of a polymer substituted fullerene (flagellene) by small angle neutron scattering

Description: Small-angle neutron scattering (SANS) can structurally characterize fullerenes in solvents with strong SANS contrast (e.g. CS{sub 2}). Deuterated solvents (e.g. toluene-d{sub 8}) have a high scattering length density (SLD), which is close to that of C{sub 60} and C{sub 70} moieties. Hence, there is virtually no SANS contrast with the solvent and these particles are practically ``invisible`` in such media. On the other hand, the negative scattering length of hydrogen means that the SLD of H{sup … more
Date: December 31, 1994
Creator: Affholter, K. A.; Bunick, G. J.; Wignall, G. D.; Desimone, J. M.; Hunt, M. O., Jr.; Menceloglu, Y. Z. et al.
Partner: UNT Libraries Government Documents Department
open access

Growth and mechanical and tribological characterization of multi-layer hard carbon films

Description: Vacuum-arc deposition is used to deposit multilayer C films by modulating the sample bias during deposition. Effect of varying the sublayer thickness in multilayer films consisting of alternating layers of ``hard`` (68.4 GPa, -100 V bias) and ``soft`` (27.5 GPa, - 200 V bias) was investigated. Films consisting of equal thickness layers of hard and soft material and an individual layer thickness varying from 10 to 35 nm were deposited. Mechanical property measurements were obtained by finite ele… more
Date: December 31, 1996
Creator: Ager, J.; Brown, I.; Monteiro, O.; Knapp, J.A.; Follstaedt, D.M.; Nastasi, M. et al.
Partner: UNT Libraries Government Documents Department
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