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Effects of catalytic mineral matter on CO/CO sub 2 , temperature and burning time for char combustion

Description: The temperature of a char particle burning in an oxygen containing atmosphere is the product of a strongly coupled balance between particle size and physical properties, heat transfer from the particle, surface reactivity, CO/CO{sub 2} ratio and gas phase diffusion in the surrounding boundary layer and within the particle. CO{sub 2}/CO ratios can be strongly influenced by catalytic material in the carbon and by the char temperature. In this program we are measuring the CO{sub 2}/CO ratio for bo… more
Date: May 4, 1992
Creator: Longwell, J. P.; Sarofim, A. F.; Lee, Chun-Hyuk & Modestino, A. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surfaces and Thin Films Studied by Picosecond Ultrasonics

Description: This research is the study of thin films and interfaces via the use of the picosecond ultrasonic technique. In these experiments ultrasonic waves are excited in a structure by means of a picosecond light pulse ( pump pulse''). The propagation of these waves is detected through the use of a probe light pulse that is time-delayed relative to the pump. This probe pulse measures the change {Delta}R(t) in the optical reflectivity of the structure that occurs because the ultrasonic wave changes the o… more
Date: May 1, 1992
Creator: Maris, J. H. & Tauc, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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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: May 18, 1987
Creator: Jha, M. C.; Baltich, L. K. & Berggren, M. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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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: May 2, 1989
Creator: Jha, M. C. & Berggren, M. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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: May 2, 1989
Creator: Silaban, A. & Harrison, D.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Shining On: A primer on solar radiation data

Description: This document is a primer on solar radiation data. General uses of solar energy are presented. The manner in which solar radiation data is used to aid engineers in optimizing the use of solar thermal conversion and photovoltaic conversion is discussed. Methods for acquiring and assimilating the solar radiation data are illustrated. This would include the design and use of pyranometers and pyrheliometers. Seasonal and geographical variations in solar flux reaching the earth are evaluated. Other … more
Date: May 1, 1992
Creator: Dunlap, M.A.; Cook, G. (eds.); Marion, B.; Riordan, C. & Renne, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pore structure and reactivity changes in hot coal gas desulfurization sorbents

Description: The primary objective of the project was the investigation of the pore structure and reactivity changes occurring in metal/metal oxide sorbents used for desulfurization of hot coal gas during sulfidation and regeneration, with particular emphasis placed on the effects of these changes on the sorptive capacity and efficiency of the sorbents. Commercially available zinc oxide sorbents were used as model solids in our experimental investigation of the sulfidation and regeneration processes.
Date: May 1, 1991
Creator: Sotirchos, S.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Annular air space effects on nuclear waste canister temperatures in a deep geologic waste repository

Description: Air spaces in a deep geologic repository for nuclear high level waste will have an important effect on the long-term performance of the waste package. The important temperature effects of an annular air gap surrounding a high level waste canister are determined through 3-D numerical modeling. Air gap properties and parameters specifically analyzed and presented are the air gap size, surfaces emissivity, presence of a sleeve, and initial thermal power generation rate; particular emphasis was pla… more
Date: May 13, 1980
Creator: Lowry, W.E.; Cheung, H. & Davis, B.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical simulations of mesoscale precipitation systems. Final progress report, 1 April-30 June 1981

Description: A numerical model designed for the study of mesoscale weather phenomena is presented. It is a three-dimensional, time-dependent model based upon a mesoscale primitive-equation system, and it includes parameterizations of cloud and precipitation processes, boundary-layer transfers, and ground surface energy and moisture budgets. This model was used to simulate the lake-effect convergence over and in the lee of Lake Michigan in late fall and early winter. The lake-effect convergence is created in… more
Date: May 12, 1982
Creator: Dingle, A. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gaseous phase coal surface modification

Description: In this report, we present an improved, feasible and potentially cost effective method of cleaning and beneficiating ultrafine coal. Increased mechanization of mining methods and the need towards depyritization, and demineralization have led to an increase in the quantity of coal fines generated in recent times. For example, the amount of {minus}100 mesh coal occurring in coal preparation plant feeds now typically varies from 5 to 25% of the total feed. Environmental constraints coupled with th… more
Date: May 7, 1992
Creator: Okoh, J.M.; Pinion, J. & Thiensatit, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surface extended x-ray absorption fine structure of low-Z absorbates using fluorescence detection

Description: Comparison of x-ray fluorescence yield (FY) and electron yield surface extended x-ray absorption fine structure spectra above the S K-edge for c(2 x 2) S on Ni(100) reveals an order of magnitude higher sensitivity of the FY technique. Using FY detection, thiophene (C/sub 4/H/sub 4/S) chemisorption on Ni(100) is studied with S coverages down to 0.08 monolayer. The molecule dissociates at temperatures as low as 100K by interaction with fourfold hollow Ni sites. Blocking of these sites by oxygen l… more
Date: May 1, 1985
Creator: Stoehr, J.; Kollin, E.B.; Fischer, D.A.; Hastings, J.B.; Zaera, F. & Sette, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surface treatment of lead glass microsphere

Description: The structural arrangement of a hydrated glass surface depends on the composition, thermal history and surface treatment. This paper considers the surface treatment of a lead glass with weak and strong acid solutions and in particular hydrogen peroxide, to give a microscopically clean microsphere.
Date: May 21, 1980
Creator: Andrews, J.E. Jr. & Koo, J.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cesium diffusion in graphite

Description: Experiments on diffusion of /sup 137/Cs in five types of graphite were performed. The document provides a completion of the report that was started and includes a presentation of all of the diffusion data, previously unpublished. Except for data on mass transfer of /sup 137/Cs in the Hawker-Siddeley graphite, analyses of experimental results were initiated but not completed. The mass transfer process of cesium in HS-1-1 graphite at 600 to 1000/sup 0/C in a helium atmosphere is essentially pure … more
Date: May 1, 1980
Creator: Evans, R. B., III; Davis, W., Jr. & Sutton, A. L., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Desiccant cooling using unglazed transpired solar collectors

Description: The use of unglazed solar collectors for desiccant regeneration in a solid desiccant cooling cycle was investigated because these collectors are lower in cost than conventional glazed flat-plate collectors. Using computer models, the performance of a desiccant cooling ventilation cycle integrated with either unglazed transpired collectors or conventional glazed flat-plate collectors was obtained. We found that the thermal performance of the unglazed system was lower than the thermal performance… more
Date: May 1, 1992
Creator: Pesaran, A. A. & Wipke, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Method for cleaning solution used in nuclear-fuel reprocessing.

Description: A nuclear fuel processing solution containing: (1) hydrocarbon diluent; (2) tri-n-butyl phosphate or tri-2-ethylhexyl phosphate; and (3) monobutyl phosphate, dibutyl phosphate, mono-2-ethylhexyl phosphate, di-2-ethylhexyl phosphate, or a complex formed by plutonium, uranium, or a fission product thereof with monobutyl phosphate, dibutyl phosphate, mono-2-ethylhexyl phosphate, or di-2-ethylhexyl phosphate is contacted with silica gel having alkali ions absorbed thereon to remove any degradation … more
Date: May 12, 1981
Creator: Tallent, O. K.; Dodson, K. E. & Mailen, J. C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Solar Pilot Plant, Phase I. Preliminary design report. Volume III. Collector subsystem. CDRL item 2

Description: The Honeywell collector subsystem features a low-profile, multifaceted heliostat designed to provide high reflectivity and accurate angular and spatial positioning of the redirected solar energy under all conditions of wind load and mirror attitude within the design operational envelope. The heliostats are arranged in a circular field around a cavity receiver on a tower halfway south of the field center. A calibration array mounted on the receiver tower provides capability to measure individual… more
Date: May 1, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Scaleup tests and supporting research for the development of duct injection technology

Description: Gilbert Commonwealth, Southern Research Institute and the American Electric Power Service Corporation have embarked on a program to convert DOE's Duct Injection Test Facility located at the Muskingum River Power Plant of Ohio Power Company to test alternate duct injection technologies. The technologies to be tested include slurry sorbent injection of hydrated lime using dual fluid nozzles, or a rotary atomizer and pneumatic injection of hydrated lime, with flue gas humidification before or afte… more
Date: May 1, 1989
Creator: Gooch, J. P.; Dismukes, E. B.; Dahlin, R. S.; Faulkner, M. G.; Klett, M. G.; Buchanan, T. L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of the total hemispherical emittance of copper and of spectrally selective surfaces. Report No. 2992

Description: The transient calorimetric technique is used to measure the temperature dependence of the total hemispherical emittance of polished copper, solar selective thin films on copper and a solar selective thin film on a metal film on quartz. Experimental results on copper do not agree with the predictions of the Davisson and Weeks theory. A new theory of the emissivity of metals based on the Drude Free Electron model is developed and compared with the expermental data on copper. With no adjustable pa… more
Date: May 1, 1978
Creator: Smalley, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Inverse problem in neutron reflection

Description: Reflectance and transmittance of neutrons from a thin film deposited on a bulk substrate are derived from solution of Schroedinger wave equation in the material medium with an optical potential. A closed-form solution for the complex reflectance and transmittance is obtained in an approximation where the curvature of the scattering length density profile in the film is small. This closed-form solution reduces to all the known approximations in various limiting cases and is shown to be more accu… more
Date: May 1, 1991
Creator: Zhou, Xiao-Lin; Felcher, G.P. (Argonne National Lab., IL (USA)) & Chen, Sow-Hsin (Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Nuclear Engineering)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laboratory studies of radionuclide distributions between selected groundwaters and geologic media. Progress report, January 1--March 31, 1979

Description: The Los Alamos Scientific Laboratory contribution to the Waste Isolation Safety Assessment Program, Task 4, for the second quarter of FY-79 involved plutonium, americium, and uranium (VI) batch sorption studies on argillite, is presented. The behavior of plutonium and americium in aqueous solutions at pH approx. = 8 with respect to container sorption, filtering, and centrifuging was also investigated. Studies of the variability of the sorption behavior for tuff were completed. Migration rate st… more
Date: May 1, 1979
Creator: Aguilar, R. D.; Bayhurst, B. P. & Bentley, G. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some characteristics of potential backfill materials

Description: A backfill material is one of the multiple barriers that may be involved in the disposal of nuclear waste. Such backfill should be a desiccant with the hydrous product having acceptable stability; it should sorb any released radioisotopes, and it should reseal any breached site. The backfill must also have acceptable thermal conductivity. This report presents data on the rate of hydration and the nature of the product of reaction of some candidate backfill materials with water and with brine. T… more
Date: May 1, 1983
Creator: Simpson, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Life cycle test of the NOXSO process

Description: This paper summarizes the data generated by the NOXSO Life Cycle Test Unit (LCTU). The NOXSO process is a dry flue gas treatment system that employs a reusable sorbent. The sorbent consists of sodium carbonate impregnated on a high-surface-area gamma alumina. A fluidized bed of sorbent simultaneously removes SO{sub 2} and NO{sub x} from flue gas at a temperature of 250{degrees}F. The spent sorbent is regenerated for reuse by treatment at high temperature with a reducing gas. This regeneration r… more
Date: May 1, 1990
Creator: Ma, W.T.; Haslbeck, J.L. & Neal, L.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fractal characteristics of fracture roughness and aperture data

Description: In this study mathematical expressions are developed for the characteristics of apertures between rough surfaces. It has shown that the correlation between the opposite surfaces influences the aperture properties and different models are presented for these different surface correlations. Fracture and apertures profiles measured from intact fractures are evaluated and it is found that they qualitatively follow the mathematically predicted trends.
Date: May 1, 1991
Creator: Kumar, S.; Bodvarsson, G. S. & Boernge, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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