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A comparison of three self-tuning control algorithms developed for the Bristol-Babcock controller

Description: A brief overview of adaptive control methods relating to the design of self-tuning proportional-integral-derivative (PID) controllers is given. The methods discussed include gain scheduling, self-tuning, auto-tuning, and model-reference adaptive control systems. Several process identification and parameter adjustment methods are discussed. Characteristics of the two most common types of self-tuning controllers implemented by industry (i.e., pattern recognition and process identification) are su… more
Date: April 1, 1992
Creator: Tapp, P.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evapotranspiration studies for protective barriers: FY 1990 status report

Description: Pacific Northwest Laboratory (PNL) and Westinghouse Hanford Company (Westinghouse Hanford) are working together to develop for the US Department of Energy (DOE) protective barriers for the near-surface disposal of hazardous waste at the Hanford Site. The proposed barrier design consists of a layer of fine-textured soil overlying a series of layers grading from sand to basalt riprap. A multiyear research program is being conducted to assess the long-term performance of barrier configurations in … more
Date: May 1, 1992
Creator: Link, S.O.; Downs, J.L.; Thiede, M.E.; Lettau, D.J.; Twaddell, T.R. (Pacific Northwest Lab., Richland, WA (United States)) & Black, R.A. (Washington State Univ., Pullman, WA (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemical Technology Division, Annual technical report, 1991

Description: Highlights of the Chemical Technology (CMT) Division's activities during 1991 are presented. In this period, CMT conducted research and development in the following areas: (1) electrochemical technology, including advanced batteries and fuel cells; (2) technology for fluidized-bed combustion and coal-fired magnetohydrodynamics; (3) methods for treatment of hazardous and mixed hazardous/radioactive waste; (4) the reaction of nuclear waste glass and spent fuel under conditions expected for an uns… more
Date: March 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thin film cadmium telluride, zinc telluride, and mercury zinc telluride solar cells

Description: This report describes research to demonstrate (1) thin film cadmium telluride solar cells with a quantum efficiency of 75% or higher at 0. 44 {mu}m and a photovoltaic efficiency of 11.5% or greater, and (2) thin film zinc telluride and mercury zinc telluride solar cells with a transparency to sub-band-gap radiation of 65% and a photovoltaic conversion efficiency of 5% and 8%, respectively. Work was directed at (1) depositing transparent conducting semiconductor films by solution growth and meta… more
Date: April 1, 1992
Creator: Chu, T.L. (University of South Florida, Tampa, FL (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaportranspiration studies for protective barriers: FY 1989 status report

Description: This document describes the results of technological developments and experiments at the Small Tube Lysimeter Facility. The objective of this research is to develop the capability to predict evapotranspiration in support of studies of water infiltration control for the Hanford Protective Barrier Development Program. Evapotranspiration is the combined loss of water from plants and soil surfaces to the atmosphere. This process must be predictable to adequately model soil water dynamics. We develo… more
Date: May 1, 1992
Creator: Link, S.O.; Thiede, M.E.; Downs, J.L.; Lettau, D.J. (Pacific Northwest Lab., Richland, WA (United States)) & Waugh, W.J. (Geotech, Grand Junction, CO (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser-ablation processes

Description: The various mechanisms by which ablation of materials can be induced with lasers are discussed in this paper. The various ablation processes and potential applications are reviewed from the threshold for ablation up to fluxes of about 10{sup 13} W/cm{sup 2}, with emphasis on three particular processes; namely, front-surface spallation, two-dimensional blowoff, and contained vaporization.
Date: January 1, 1992
Creator: Dingus, R. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laser-induced contained-vaporization in tissue

Description: When a transparent liquid or solid medium is present in front of an opaque target being irradiated by an intense laser beam, then the expansion of hot vapors generated (at the interface between the medium and the target) by the irradiant heating of the target is restrained by the medium. The tamping effect of the overlying liquid or solid can cause a much larger fraction of the deposited energy to go into kinetic energy, which leads to enhanced tissue disruption, compared to when a gas or vacuu… more
Date: January 1, 1992
Creator: Dingus, R. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ANL-W 779 pond seepage test

Description: The ANL-W 779 sanitary wastewater treatment ponds are located on the Idaho National Engineering Laboratory (INEL), north of the Argonne National Laboratory -- West (ANL-W) site A seepage test was performed for two Argonne National Laboratory -- West (ANL-W) sanitary wastewater treatment ponds, Facility 779. Seepage rates were measured to determine if the ponds are a wastewater land application facility. The common industry standard for wastewater land application facilities is a field-measured … more
Date: November 1, 1992
Creator: Braun, D.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaporation and burning of a spherical fuel droplet in a uniform convective flowfield

Description: An analytical/numerical model is developed for the evaporation and burning of a spherical fuel droplet in a subsonic crossflow. The external gaseous flowfield is represented using an approximate compressible potential-flow solution, while the internal flowfield of the droplet is represented by the classical Hill's spherical vortex. This allows a numerical solution for the external boundary layer, from which the droplet's effective drag coefficent, rate of mass loss, size, and the shape of the d… more
Date: January 1, 1992
Creator: Madooglu, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oxidation and volatilization of a niobium alloy

Description: This report presents the findings from a preliminary investigation into oxidation and volatilization characteristics of a niobium alloy. Niobium is a candidate alloy for use in plasma facing components (PFCS) in experimental fusion reactors like the Intemational Thermonuclear Experimental Reactor (ITER). An experimental alloy was tailored to simulate small changes in chemistry which could result from transmutations from irradiation. The alloy was exposed in air and steam between 800[degree]C an… more
Date: July 1, 1992
Creator: Smolik, G. R. & McCarthy, K. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser-ablation processes

Description: The various mechanisms by which ablation of materials can be induced with lasers are discussed in this paper. The various ablation processes and potential applications are reviewed from the threshold for ablation up to fluxes of about 10{sup 13} W/cm{sup 2}, with emphasis on three particular processes; namely, front-surface spallation, two-dimensional blowoff, and contained vaporization.
Date: May 1, 1992
Creator: Dingus, R. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ANL-W 779 pond seepage test

Description: The ANL-W 779 sanitary wastewater treatment ponds are located on the Idaho National Engineering Laboratory (INEL), north of the Argonne National Laboratory -- West (ANL-W) site A seepage test was performed for two Argonne National Laboratory -- West (ANL-W) sanitary wastewater treatment ponds, Facility 779. Seepage rates were measured to determine if the ponds are a wastewater land application facility. The common industry standard for wastewater land application facilities is a field-measured … more
Date: November 1, 1992
Creator: Braun, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evapotranspiration studies for protective barriers: FY 1990 status report

Description: Pacific Northwest Laboratory (PNL) and Westinghouse Hanford Company (Westinghouse Hanford) are working together to develop for the US Department of Energy (DOE) protective barriers for the near-surface disposal of hazardous waste at the Hanford Site. The proposed barrier design consists of a layer of fine-textured soil overlying a series of layers grading from sand to basalt riprap. A multiyear research program is being conducted to assess the long-term performance of barrier configurations in … more
Date: May 1, 1992
Creator: Link, S. O.; Downs, J. L.; Thiede, M. E.; Lettau, D. J.; Twaddell, T. R. & Black, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrogen generation in SRAT with nitric acid and late washing flowsheets

Description: Recently, SRTC recommended two process changes: (1) a final wash of the tetraphenylborate precipitate feed slurry and (2) the use of nitric acid to neutralize the sludge in the SRAT. The first change produced an aqueous hydrolysis product (PHA) with higher formic acid/formate and copper concentration, and reduced the nitrate content in the PHA by an order of magnitude. The second change is to substitute part of formic acid added to the SRAT with nitric acid, and therefore may reduce the hydroge… more
Date: October 26, 1992
Creator: Hsu, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Steam stripping of polycyclic aromatics from simulated high-level radioactive waste

Description: The Defense Waste Processing Facility (DWPF) at the Savannah River Site (SRS) will be the United States` first facility to process High Level radioactive Waste (HLW) into a borosilicate glass matrix. The removal of aromatic precipitates by hydrolysis, evaporation, liquid-liquid extraction and decantation will be a key step in the processing of the HLW. This step, titled the Precipitate Hydrolysis Process, has been demonstrated by the Savannah River Technology Center with the Precipitate Hydroly… more
Date: December 31, 1992
Creator: Lambert, D. P.; Shah, H. B.; Young, S. R.; Edwards, R. E. & Carter, J. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nuclear fuels for very high temperature applications

Description: The success of the development of nuclear thermal propulsion devices and thermionic space nuclear power generation systems depends on the successful utilization of nuclear fuel materials at temperatures in the range 2000 to 3500 K. Problems associated with the utilization of uranium bearing fuel materials at these very high temperatures while maintaining them in the solid state for the required operating times are addressed. The critical issues addressed include evaporation, melting, reactor ne… more
Date: August 1, 1992
Creator: Lundberg, L. B. & Hobbins, R. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An evaluation of vapor extraction of vadose zone contamination

Description: An in-depth analysis of vapor extraction for remediation of soils contaminated with volatile organic compounds (VOCS) was conducted at 13 sites. The effectiveness of vapor extraction systems (VES) was evaluated on the basis of soil concentrations of VOCs and soil-gas concentrations of VOC`s. The range of effectiveness was found to be 64%--99% effective in removing organic contaminants from soil. At nine of the 13 sites studied in this report, vapor extraction was found to be effective in reduci… more
Date: May 1, 1992
Creator: Crotwell, A. T.; Waehner, M. J.; MacInnis, J. M.; Travis, C. C. & Lyon, B. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A numerical solution to three-dimensional multiphase transport of volatile organic compounds in unsaturated soils -- with an application to the remedial method of in-situ volatilization. Part I: Theoretical development

Description: Part I of this paper presents the development and application of a numerical model for determining the fate and transport of volatile organic compounds (VOCS) in the unsaturated zone resulting from forced volatilization and gaseous advection-dispersion of organic vapor in a multipartitioned three-dimensional environment. The model allows for single-component transport in the gas and water phases. The hydrocarbon is assumed to be in specific retention and, therefore, immobile. Partitioning of th… more
Date: April 1, 1992
Creator: Filley, T. & Tomasko, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Waste treatment process for removal of contaminants from aqueous, mixed-waste solutions using sequential chemical treatment and crossflow microfiltration, followed by dewatering

Description: It is an object of the claimed invention to combine chemical treatment with microfiltration process to treat groundwater, leachate from contaminated soil washing, surface and run-off waters contaminated with toxic metals, radionuclides and trace amounts of organics from variety of sources. The process can also be used to treat effluents from industrial processes such as discharges associated with smelting, mining and refining operations. Influent contaminants amenable to treatment are from a fe… more
Date: December 31, 1992
Creator: Vijayan, S.; Wong, Chi Fun & Buckley, L. P.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Fast-ICCD photography and gated photon counting measurements of blackbody emission from particulates generated in the KrF-laser ablation of BN and YBCO

Description: Fast intensified CCD photography and gated photon counting following KrF-laser irradiation of YBCO and BN targets reveals the first observations of very weak emission from slow-moving ejecta up to 2 cm from the target and times extending to {approx}1.5 ms. Time-of-flight velocities inferred from the emission measurements indicate velocities (v {approximately} (0.45--1.2) {times} 10{sup 4} cm s{sup {minus}1}) comparable to those measured for the large particles which often accompany the pulsed l… more
Date: November 1, 1992
Creator: Geohegan, D. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An overview of heat exchanger enhancement techniques for industrial applications

Description: An assessment is make of selected currently available heat exchanger enhancement techniques for single- and two-phase heat transfer mechanisms to determine their practicality and commercialization potential for different industrial applications. The assessment includes a screening review of the major techniques being investigated in the research community, and identification of selected passive techniques and determine their potential limitations with respect to industrial applications. A more … more
Date: June 1, 1992
Creator: Somasundaram, S.; Ohadi, M. M. & Richlen, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An overview of heat exchanger enhancement techniques for industrial applications

Description: An assessment is make of selected currently available heat exchanger enhancement techniques for single- and two-phase heat transfer mechanisms to determine their practicality and commercialization potential for different industrial applications. The assessment includes a screening review of the major techniques being investigated in the research community, and identification of selected passive techniques and determine their potential limitations with respect to industrial applications. A more … more
Date: June 1, 1992
Creator: Somasundaram, S. (Pacific Northwest Lab., Richland, WA (United States)); Ohadi, M. M. (Maryland Univ., Baltimore, MD (United States)) & Richlen, S. (US Dept. of Energy, Washington, DC (US))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An evaluation of vapor extraction of vadose zone contamination

Description: An in-depth analysis of vapor extraction for remediation of soils contaminated with volatile organic compounds (VOCS) was conducted at 13 sites. The effectiveness of vapor extraction systems (VES) was evaluated on the basis of soil concentrations of VOCs and soil-gas concentrations of VOC's. The range of effectiveness was found to be 64%--99% effective in removing organic contaminants from soil. At nine of the 13 sites studied in this report, vapor extraction was found to be effective in reduci… more
Date: May 1, 1992
Creator: Crotwell, A. T.; Waehner, M. J.; MacInnis, J. M.; Travis, C. C. & Lyon, B. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaportranspiration studies for protective barriers: FY 1989 status report

Description: This document describes the results of technological developments and experiments at the Small Tube Lysimeter Facility. The objective of this research is to develop the capability to predict evapotranspiration in support of studies of water infiltration control for the Hanford Protective Barrier Development Program. Evapotranspiration is the combined loss of water from plants and soil surfaces to the atmosphere. This process must be predictable to adequately model soil water dynamics. We develo… more
Date: May 1, 1992
Creator: Link, S. O.; Thiede, M. E.; Downs, J. L.; Lettau, D. J. & Waugh, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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