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Positron ring system using anger-type detectors

Description: The major accomplishments of this year include (1) building and debugging a new set of coincidence electronics for our laboratory setup, (2) performing a series of detector experiments in the dry glove-box aimed at improving the performance of NaI(Tl) position-sensitive detectors, (3) modifying and debugging a Monte Carlo simulation code to test reconstruction algorithms and predict overall performance of a large solid angle PET scanner, (4) significant progress in the 3-D reprojection reconstr… more
Date: November 15, 1991
Creator: Karp, J.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laboratory directed research and development

Description: The purposes of Argonne's Laboratory Directed Research and Development (LDRD) Program are to encourage the development of novel concepts, enhance the Laboratory's R D capabilities, and further the development of its strategic initiatives. Among the aims of the projects supported by the Program are establishment of engineering proof-of-principle''; development of an instrumental prototype, method, or system; or discovery in fundamental science. Several of these project are closely associated wit… more
Date: November 15, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photoexcited Charge Pair Escape and Recombination

Description: We report photocurrent transients arising from the pulsed laser excitation of the dipolar first excited singlet sate S{sub 1} of trans 4-dimethyl-amino-4{prime}-nitrostilbene (DMANS) in toluene solution. The currents arise from rotational reorientation of DMANS dipoles with respect to the axis of an applied electric field. The method appears to offer a simple and general approach to the measurement of the change in dipole moment upon electronic excitation of a molecule. In another experiment, d… more
Date: November 15, 1991
Creator: Braun, Charles L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis and analysis of novel polymers with high permselectivity and permeability in gas separation applications

Description: We have synthesized and completed characterization of permeability and selectivity properties of a group of polysulfones and polyether ketones with the potential for higher use temperatures, as well as members of a series of polyesters derived from spirobiindane bisphenol monomer in conjunction with meta and para substituted diacid chlorides. We have also synthesized and characterized the gas transport and thermal properties of diphenyl substituted polyphenylene oxide. The diphenyl substituted … more
Date: November 15, 1991
Creator: Koros, W. J. & Paul, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photoexcited charge pair escape and recombination. Progress report, November 15, 1990--November 14, 1991

Description: We report photocurrent transients arising from the pulsed laser excitation of the dipolar first excited singlet sate S{sub 1} of trans 4-dimethyl-amino-4{prime}-nitrostilbene (DMANS) in toluene solution. The currents arise from rotational reorientation of DMANS dipoles with respect to the axis of an applied electric field. The method appears to offer a simple and general approach to the measurement of the change in dipole moment upon electronic excitation of a molecule. In another experiment, d… more
Date: November 15, 1991
Creator: Braun, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laboratory directed research and development. FY 1991 program activities: Summary report

Description: The purposes of Argonne`s Laboratory Directed Research and Development (LDRD) Program are to encourage the development of novel concepts, enhance the Laboratory`s R&D capabilities, and further the development of its strategic initiatives. Among the aims of the projects supported by the Program are establishment of engineering ``proof-of-principle``; development of an instrumental prototype, method, or system; or discovery in fundamental science. Several of these project are closely associated w… more
Date: November 15, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis and analysis of novel polymers with high permselectivity and permeability in gas separation applications. Progress report, December 1990--November 1991

Description: We have synthesized and completed characterization of permeability and selectivity properties of a group of polysulfones and polyether ketones with the potential for higher use temperatures, as well as members of a series of polyesters derived from spirobiindane bisphenol monomer in conjunction with meta and para substituted diacid chlorides. We have also synthesized and characterized the gas transport and thermal properties of diphenyl substituted polyphenylene oxide. The diphenyl substituted … more
Date: November 15, 1991
Creator: Koros, W. J. & Paul, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Properties and Weldability of Materials for Fusion Reactor Applications

Description: Low-activation austenitic stainless steels have been suggested for applications within fusion reactors. The use of these nickel-free steels will help to reduce the radioactive waste management problem after service. one requirement for such steels is the ability to obtain sound welds for fabrication purposes. Thus, two austenitic Fe-Cr-Mn alloys were studied to characterize the welded microstructure and mechanical properties. The two steels investigated were a Russian steel (Fe-11.6Cr19.3Mn-0.1… more
Date: November 15, 1991
Creator: Chin, B. A.; Kee, C. K.; Wilcox, R. C. & Zinkle, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Spray nozzle pattern test for the DWPF HEME task technical plan

Description: The DWPF melter off-gas systems have two High-Efficiency Mist Eliminators (HEME) upstream of the High-Efficiency Particulates Air filters (HEPA) to remove fine droplets and particulates from the off-gas. The HEMEs consist of three filter candles. Each filter candle consists of a 0.5 inch layer of 30 micron diameter glass fiber on the upstream face followed by a 2.5 inch layer of 8-micron-diameter glass fiber packed at 11 lbs per cubic foot. The coarse 30-micron filter serves as a prefilter and … more
Date: November 15, 1991
Creator: Lee, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Spray nozzle pattern test for the DWPF HEME task technical plan. [Defense Waste Processing Facility (DWPF), High-Efficiency Mist Eliminators (HEME)]

Description: The DWPF melter off-gas systems have two High-Efficiency Mist Eliminators (HEME) upstream of the High-Efficiency Particulates Air filters (HEPA) to remove fine droplets and particulates from the off-gas. The HEMEs consist of three filter candles. Each filter candle consists of a 0.5 inch layer of 30 micron diameter glass fiber on the upstream face followed by a 2.5 inch layer of 8-micron-diameter glass fiber packed at 11 lbs per cubic foot. The coarse 30-micron filter serves as a prefilter and … more
Date: November 15, 1991
Creator: Lee, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Innovative Clean Coal Technology (ICCT): Demonstration of innovative applications of technology for cost reductions to the CT-121 FGD process. Quarterly report No. 6, July--September 1991

Description: The project`s objective is to demonstrate innovative applications of technology for cost reduction for the Chiyoda Thoroughbred-121 (CT-121) process. The CT-121 process is a wet FGD process that removes SO{sub 2}, can achieve simultaneous particulate control, and can produce a salable by-product gypsum thereby reducing or even eliminating solid waste disposal problems. Figure 1 shows a flow schematic of the process. CT-121 removes SO{sub 2} and particulate matter in a unique limestone-based scr… more
Date: November 15, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Formal methods in the development of safety critical software systems

Description: As the use of computers in critical control systems such as aircraft controls, medical instruments, defense systems, missile controls, and nuclear power plants has increased, concern for the safety of those systems has also grown. Much of this concern has focused on the software component of those computer-based systems. This is primarily due to historical experience with software systems that often exhibit larger numbers of errors than their hardware counterparts and the fact that the conseque… more
Date: November 15, 1991
Creator: Williams, L. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cavity design and beam simulations for the APS rf gun

Description: An earlier note discussed the preliminary design of the 1-1/2 cell RF cavity for the APS RF gun. This note describes the final design, including cavity properties and simulation results from the program rf gun. The basic idea for the new design was that the successful SSRL design could be improved upon by reducing fields that had nonlinear dependence on radius. As discussed previously, this would reduce the emittance and produce tighter momentum and time distributions. In addition, it was desir… more
Date: November 15, 1991
Creator: Borland, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Properties and Weldability of Materials for Fusion Reactor Applications

Description: Low-activation austenitic stainless steels have been suggested for applications within fusion reactors. The use of these nickel-free steels will help to reduce the radioactive waste management problem after service. one requirement for such steels is the ability to obtain sound welds for fabrication purposes. Thus, two austenitic Fe-Cr-Mn alloys were studied to characterize the welded microstructure and mechanical properties. The two steels investigated were a Russian steel (Fe-11.6Cr19.3Mn-0.1… more
Date: November 15, 1991
Creator: Chin, B. A.; Kee, C. K.; Wilcox, R. C. & Zinkle, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Positron ring system using anger-type detectors. Progress report, February 15, 1991--February 14, 1992

Description: The major accomplishments of this year include (1) building and debugging a new set of coincidence electronics for our laboratory setup, (2) performing a series of detector experiments in the dry glove-box aimed at improving the performance of NaI(Tl) position-sensitive detectors, (3) modifying and debugging a Monte Carlo simulation code to test reconstruction algorithms and predict overall performance of a large solid angle PET scanner, (4) significant progress in the 3-D reprojection reconstr… more
Date: November 15, 1991
Creator: Karp, J. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle deposition in human and canine tracheobronchial casts

Description: The aim of this work is to measure deposition patterns and efficiencies of aerosol particles within realistic, single-pathway physical models of the tracheobronchial airways of humans and experimental animals over a range of particle sizes for a variety of respiratory modes and rates. This will provide data needed to assess the dose to the bronchial epithelium from inhaled radon progeny. In prior grant years an empirical expression for diffusional deposition efficiency of particles in the upper… more
Date: November 15, 1991
Creator: Cohen, B.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle deposition in human and canine tracheobronchial casts. Annual progress report

Description: The aim of this work is to measure deposition patterns and efficiencies of aerosol particles within realistic, single-pathway physical models of the tracheobronchial airways of humans and experimental animals over a range of particle sizes for a variety of respiratory modes and rates. This will provide data needed to assess the dose to the bronchial epithelium from inhaled radon progeny. In prior grant years an empirical expression for diffusional deposition efficiency of particles in the upper… more
Date: November 15, 1991
Creator: Cohen, B. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Oral History Interview with Erma Peace, November 15, 1991

Description: Interview with Erma Peace, a former student at the Frederick Douglass Colored School in Denton, Texas. In the interview, Peace describes what it was like attending the school, and includes details concerning the facilities, extra-curricular activities, the layout of the school, teachers and the principal, and activities. Peace comments on segregation in Denton.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: November 15, 1991
Creator: Glaze, Michele & Peace, Erma
Item Type: Refine your search to only Book
Partner: UNT Oral History Program
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