UNT Libraries Government Documents Department - 227 Matching Results

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Enhanced durability and reactivity for zinc ferrite desulfurization sorbent

Description: AMAX Research Development Center (AMAX R D) has been investigating methods for enhancing the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. For the present program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-… more
Date: August 28, 1987
Creator: Jha, Mahesh C.; Baltich, Linda K. & Berggren, Mark H.
open access

Transverse energy distributions in Si + nucleus collisions at 10 GeV/nucleon

Description: Transverse energy distributions have been measured for collisions of 10 GeVnucleon Si with targets of Al, Cu and Pb using a combination of a NaI wall and a uranium based sampling calorimeter. The measured cross sections d..sigma..dE/sub T/ and dE/sub T/d)eta are consistent with full stopping and an increase, with increasing values of E/sub T/, of energy flow into large angles. 4 refs., 7 figs., 2 tabs
Date: August 1, 1987
Creator: Bassalleck, B; Braun-Munzinger, P.; Cleland, W.; G., David; Farooq, A.; Fatyga, M. et al.
open access

Development of highly polished, grazing incidence mirrors for synchrotron radiation beam lines at SSRL

Description: New platinum-coated grazing incidence mirrors with low surface roughnesses have been developed to focus bending magnet radiation from the SSRL/SLAC SPEAR storage ring on the entrance slits of two Beam Line VIII grating monochromators. The first mirror in the toroidal grating monochromator (TGM) branch is a cooled SiC cylinder capable of absorbing synchrotron radiation power levels of up to 260 watts without excessive distortion. This mirror deflects the beam vertically through a 12/degree/ angl… more
Date: August 1, 1987
Creator: Tirsell, K. G.; Berglin, E. J.; Fuchs, B. A.; Holdener, F. R.; Humpal, H. H.; Karpenko, V. P. et al.
open access

Similarity solutions of nonlinear partial differential equations invariant to a family of affine groups

Description: Problems of technological interest can very often be described by partial differential equations (PDEs) with one dependent and two independent variables (call them c, z, and t, respectively). Many such PDEs are invariant to one-parameter families of one-parameter affine groups. Similarity solutions are solutions of the PDE that are invariant to one group of the family. The great utility of similarity solutions is that they may be calculated by solving an ODE rather than a PDE and are thus much … more
Date: August 1, 1987
Creator: Dresner, L.
open access

Mirror theory applied to toroidal systems

Description: Central features of a mirror plasma are strong departures from Maxwellian distribution functions, ambipolar potentials and densities which vary along a field line, and losses, and the mirror field itself. To examine these features, mirror theorists have developed analytical and numerical techniques to solve the Fokker-Planck equation, evaluate the potentials consistent with the resulting distribution functions, and assess the microstability of these distributions. Various combinations of mirror… more
Date: August 25, 1987
Creator: Cohen, R.H.
open access

A Review of Two-Phase Flow-Induced Vibration

Description: Two-phase flow exists in many shell-and-tube heat exchangers and power generation components. The flowing fluid is a source of energy that can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities. In fact, many practical system components have experienced excessive flow-induced vibrations. To prevent unacceptable flow-induced vibration, we must understand excitation mechanisms, develop analytical and experimental techniques, and provide reliable design guide… more
Date: August 1987
Creator: Chen, Shoei-Sheng
open access

A Review of Parameterizations of Microphysical Processes in Clouds for Application in Models of Regional Atmospheric Deposition

Description: The literature on parameterizations of cloud microphysical processes was reviewed to examine the theoretical bases of those parameterizations and to evaluate their applicability to regional models. New parameterizations were produced by multiple regression upon the solution fields derived from simulations of a cloud model incorporating sophisticated microphysics. The currently available rates for cloud microphysical interactions were generally derived under the assumption that the size distribu… more
Date: August 1987
Creator: Lee, L. Y. & Hong, M. S.
open access

Weight Losses of Marble and Limestone Briquettes Exposed to Outdoor Environments in the Eastern United States

Description: Weight losses of marble and limestone samples exposed to outdoor environments at field sites in the eastern United States have been monitored in studies initiated in 1984. The procedures are described, and the results are tabulated and discussed. A rate of marble loss approximately equivalent to 16 micrometers of surface recession per year was found in North Carolina, and losses of this order were also observed in New Jersey, New York, and Washington, DC. Limestone weight losses were much highe… more
Date: August 1987
Creator: Youngdahl, C. A.
open access

Application of microwave energy for in-drum solidification of simulated precipitation sludge

Description: The application of microwave energy for in-container solidification of simulated transuranic contaminated precipitation sludges has been tested. Results indicate volume reductions to 83% are achievable by the continuous feeding of pre-dried sludge into a waste container while applying microwave energy. An economic evaluation was completed showing achievable volume and weight reductions to 87% compared with a current immobilization process for wet sludge. 7 refs., 15 figs., 16 tabs.
Date: August 17, 1987
Creator: Petersen, R. D.; Johnson, A. J.; Swanson, S. D. & Thomas, R. L. (ed.)
open access

Monopole strength as a probe of nuclear shape mixing

Description: The monopole strength, MS, within a single set of nuclear shape excitations is compared with the MS between different shapes. After misconceptions are pointed out concerning the spin dependence of B(E2) values, MS properties are juxtaposed with gamma-ray and beta-decay properties of /sup 70/Se, /sup 96/Zr, /sup 102/Pd, and the N = 60 isotones to illustrate the utility of combined investigations and evidence is given for the observation of a two-phonon octupole multiplet. Finally, consideration … more
Date: August 17, 1987
Creator: Meyer, R.A.
open access

Gasification of char in a membrane filter: Final report

Description: This report deals with the feasibility of reducing the amount of char on a barrier filter by in-place gasification. Compared to the very rapid pyrolysis step, the gasification of char on a filter requires substantial time under conditions that favor the gasification reactions. Three categories of information were of greatest interest: (1) The origin, characteristics and properties of the char. (2) The conditions under which the char was gasified and the rates and extents of the gasification rea… more
Date: August 1, 1987
Creator: Hess, M. & Di Bella, C.A.W.
open access

Conceptual design of a black liquor gasification pilot plant

Description: In July 1985, Champion International completed a study of kraft black liquor gasification and use of the product gases in a combined cycle cogeneration system based on gas turbines. That study indicated that gasification had high potential as an alternative to recovery boiler technology and offered many advantages. This paper describes the design of the plant, the construction of the pilot plant, and finally presents data from operation of the plant.
Date: August 1, 1987
Creator: Kelleher, E. G.
open access

Neutron Production of Charm Particles in Fermilab E-400

Description: Results are presented from Fermilab E-400 on the production of charmed baryons and mesons using incident neutrons. We show evidence for the charm-strange baryon, ..xi../sub c//sup +/, and present our measurements of its mass, width, lifetime, cross section and relative branching fractions, and the A, x/sub f/, p/sub t/, and particle/antiparticle dependence of the state. We show evidence for both the ..sigma../sub c//sup + +/ and ..sigma../sub c//sup 0/, and present measurements of three mass di… more
Date: August 20, 1987
Creator: Cumalat, J. P.; Binkley, M.; Bossi, F.; Butler, J.; Coteus, P.; DiCorato, M. et al.
open access

Ultrasonic beam distortion in transversely isotropic media

Description: The distortion of beam profiles and skewing of beam energy observed in transmission of ultrasound into a transversely isotropic medium can lead to erroneous interpretations of NDE data for materials such as columnar-grain steels and fiber-reinforced composites. In this paper, results are presentd for the numerical evaluation of the exact Fourier integral representation of transmission of an arbitrary incident field from an isotropic into a transversely isotropic half-space. The problem is fully… more
Date: August 1, 1987
Creator: Roberts, R. A. & Kupperman, D. S.
open access

Comparative studies in direct slow-neutron capture calculations

Description: Primary E1 transitions due to thermal neutron capture by the nuclides /sup 9/Be, /sup 32,34/S, /sup 40,42,44,46,48/Ca, and /sup 58/Ni are quantitatively interpreted by the Lane-Lynn formula and are compared with recent optical model calculations. The two approaches are equivalent provided the internal region of the nucleus is excluded in the optical model approach. Theoretical justifications for such a procedure are briefly presented. 32 refs., 4 tabs.
Date: August 1, 1987
Creator: Mughabghab, S. F.
open access

Technical data summary: Plan for closure of the 643-G burial ground

Description: This report involves the actions of closing the 643-G burial ground which involves waste removal, stabilization, and capping. Remedial action involves the removing of the transuranic waste and closing of the grid wells. The closure cap for the burial site will consist of native soil, clay, and gravel. This will assure long-term physical and chemical stability. (MB)
Date: August 17, 1987
Creator: Cook, J. R.
open access

Corrosion behavior of vanadium alloys in flowing lithium

Description: Corrosion data are presented for several vanadium alloys exposed to flowing lithium at 427, 482, and 538/sup 0/C. The corrosion behavior is evaluated by weight change measurements. Metallographic results and data on the nonmetallic element transfer in lithium-exposed specimens are also presented. The influence of alloy composition and exposure conditions on the corrosion behavior of vanadium alloys is discussed. 6 refs., 9 figs., 2 tabs.
Date: August 1, 1987
Creator: Chopra, O. K. & Smith, D. L.
open access

An overview of environmental degradation of materials in nuclear power plant piping systems

Description: Piping in light water reactor (LWR) power systems is affected by several types of environmental degradation: intergranular stress corrosion cracking (IGSCC) of austenitic stainless steel piping in boiling water reactors (BWRs) has required research, inspection, and mitigation programs that will ultimately cost several billion dollars; erosion-corrosion of carbon steel piping has been observed frequently in the secondary systems of both BWRs and pressurized water reactors (PWRs); the effect of t… more
Date: August 1, 1987
Creator: Shack, W.J.
open access

Environmentally assisted cracking in light water reactors

Description: Cracking in sensitized austenitic stainless steel (SS) piping and associated components in boiling water reactors (BWRs) has been observed since the mid-1960s. Proposed remedies include procedures that produce a favorable residual stress state in the weld regions, replacement of the piping with materials that are more resistant to SCC, and modification of the reactor coolant environment. During this year, studies that have important implications for all three classes of proposed remedies have b… more
Date: August 1, 1987
Creator: Shack, W. J.; Kassner, T. F.; Maiya, P. S.; Park, J. Y.; Ruther, W. E.; Kuczay, T. M. et al.
open access

Use of a United States mid-Pacific Island territory for a Pacific Island Repository System (PIRS): Extended summary

Description: The concept of using a mid-ocean island for a geologic high-level waste repository was investigated. The technical advantages include geographical isolation and near-infinite ocean dilution as a backup to repository geological waste isolation. The institutional advantages are reduced siting problems and the potential of creating an international waste repository. Establishment of international waste repository would allow cost sharing, aid US nonproliferation goals, and assure proper disposal o… more
Date: August 1, 1987
Creator: Forsberg, Charles W.
open access

Process monitoring in support of International Atomic Energy Agency safeguards

Description: A review of previous efforts in process monitoring for safeguards was conducted. Previous efforts touched on various concepts and a few specific applications, but none was comprehensive in addressing all aspects of a process monitoring application for safeguards. This report develops prototypical process monitoring concepts that can be incorporated into the International Atomic Energy Agency's (IAEA's) general safeguards approach for fuel reprocessing plants. This effort considers existing appr… more
Date: August 1, 1987
Creator: Ehinger, M. H.; Wachter, J. W.; Hebble, T. L. & Kerr, H. T.
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