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373 Matching Results
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An analysis of grazing incidence metal mirrors in a laser ICF reactor driver
Grazing incidence metal mirrors (GIMMs) are examined to replace dielectric mirrors for the final elements in a laser beam line for an inertial confinement fusion reactor. For a laser driver with a wavelength from 250 to 500 nm in a 10-ms pulse, irradiated mirrors made of Al, Al alloys, or Mg were found to have calculated laser damage limits of 0.3--2.3 J/cm{sup 2} of beam energy and neutron lifetime fluence limits of over 5 {times} 10{sup 20} 14 MeV n/cm{sup 2} when used at grazing incidence and operated at room temperature or at 77 K. A final focusing system including mirrors made of Al alloy 7475 at room temperature or at liquid nitrogen temperatures used with a driver which delivers 5 MJ of beam energy in 32 beams would require 32 mirrors of roughly 10 m{sup 2} each. This chapter includes calculations of damage limits for GIMMs and discusses critical issues relevant to the integrity and lifetime of such mirrors in a reactor environment. The reflectivities of various metals are calculated from measured optical constants at room temperature and at cryogenic temperatures for 250- to 500-nm light at both normal and grazing incidence. Then, for the mirrors in a representative …
Date:
July 12, 1991
Creator:
Bieri, R. & Guinan, M.
Object Type:
Report
System:
The UNT Digital Library
Electric Power Monthly, September 1991. [CONTAINS GLOSSARY]
This publication provides monthly statistics at the national, Census division, and state levels for net generation, fuel consumption, fuel stocks, quantity and quality of fuel, cost of fuel, electricity sales, revenue, and average revenue per kilowatthour of electricity sold. Data on net generation, fuel consumption, fuel stocks, quantity and cost of fuel are also displayed at the North American Electric Reliability Council (NERC) region level. Additionally, statistics at the company and plant level are published in the EPM on capability of new plants, net generation, fuel consumption, fuel stocks, quantity and quality of fuel, and cost of fuel. 4 figs., 63 tabs.
Date:
September 12, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
A 3-D adaptive mesh refinement algorithm for multimaterial gas dynamics
Adaptive Mesh Refinement (AMR) in conjunction with high order upwind finite difference methods has been used effectively on a variety of problems. In this paper we discuss an implementation of an AMR finite difference method that solves the equations of gas dynamics with two material species in three dimensions. An equation for the evolution of volume fractions augments the gas dynamics system. The material interface is preserved and tracked from the volume fractions using a piecewise linear reconstruction technique. 14 refs., 4 figs.
Date:
August 12, 1991
Creator:
Puckett, E. G. & Saltzman, J. S.
Object Type:
Article
System:
The UNT Digital Library
[Fax from D. Jack Davis to Janice Wiggins, December 12, 1991]
Photocopy of a letter from D. Jack Davis to Janice Wiggins that was faxed to her. The letter is about the payment due for the 1992 Summer Institute. Davis agrees to cover a majority of the stipends and funding so long as DISD covers 50% of the stipends for seven of their teams. At the top of the letter is a note that reads "for your files".The facsimile transmission cover sheet is filled in as follows, the date: "12-12-91", sent to: "Janice Wiggins, DISD", to fax machine: "(214)565-5485", from: "D. Jack Davis Provost Office, (817)565-3951". It is filled in as a two page transmission.
Date:
December 12, 1991
Creator:
Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
Comments on FAST survey
The following messages were taken from Inter-office Electronic Mail and provide perspective on the DOE FAST site survey. The key issue is that WSRC analytical groups have been unable to state when processes will be operated and what the exact requirements will be for characterizing materials from those processes when they do start. What results is a uncertainty at the site in the actual analytical work load. Although Donnan refers to the original survey data, one update was submitted to the needs requirements in the fall of 90. However that update was not as complete as the one given below. I have identified some of the people using brackets.
Date:
July 12, 1991
Creator:
Spencer, W. A. & Donnan, J. G.
Object Type:
Report
System:
The UNT Digital Library
Summary report for 1990 inservice inspection (ISI) of SRS 100-L reactor tank
The integrity of the SRS reactor tanks is a key factor affecting their suitability for continued service since, unlike the external piping system and components, the tanks are virtually irreplaceable. Cracking in various areas of the process water piping systems has occurred beginning in about 1960 as a result of several degradation mechanisms, chiefly intergranular stress corrosion cracking (IGSCC) and chloride-induced transgranular cracking. The primary objective of this inspection was to determine if the accessible welds and selected portions of base metal in the L Reactor tank wall contain any indications of IGSCC. This inspection included areas in and beyond the weld HAZ, extending out as far as two to three inches from the centerline of the welds, plus selected areas of base metal at the intersection of the main tank vertical and mid-girth welds. No evidence of such degradation was found in any of the areas examined. Further, additional inspections were conducted of areas that had been damaged and repaired during original fabrication, and on a sample of areas containing linear indications observed during the 1986 visual inspection of the tank. No evidence of IGSCC or other service induced degradation was detected in these areas, either. The inspection was …
Date:
July 12, 1991
Creator:
Morrison, J. M. & Loibl, M. W.
Object Type:
Report
System:
The UNT Digital Library
Plasma injection and atomic physics models for use in particle simulation codes
Models of plasma injection (creation) and charged/neutral atomic physics which are suitable for incorporation into particle simulation codes are described. Both planar and distributed source injection models are considered. Results obtained from planar injection into a collisionless plasma-sheath region are presented. The atomic physics package simulates the charge exchange and impact ionization interactions which occur between charged particles and neutral atoms in a partially-ionized plasma. These models are applicable to a wide range of problems, from plasma processing of materials to transport in the edge region of a tokamak plasma. 18 refs., 6 figs.
Date:
June 12, 1991
Creator:
Procassini, R.J. (Lawrence Livermore National Lab., CA (USA) California Univ., Berkeley, CA (USA). Electronics Research Lab.)
Object Type:
Report
System:
The UNT Digital Library
[Journal of Hugh Burns Callaway]
Journal kept by Hugh Callaway from October 12th, 1991 to March 12th, 1993. Some of the entries discuss the murder of his significant other.
Date:
1991-10-12/1993-03-12
Creator:
Callaway, Hugh Burns
Object Type:
Book
System:
The UNT Digital Library
[Fax to Dallas Voice]
Xerographic of a fax to the Dallas Voice. Ink is very faded.
Date:
August 12, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Notes: Interview with Susan White]
Notes from a meeting with Susan Wilson discussing the financial practices of the March on Austin Committee.
Date:
August 12, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Fax to Dallas Voice]
Fax to Dallas Voice. Ink is very faded.
Date:
August 12, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 37, Ed. 1 Thursday, September 12, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
September 12, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 50, Ed. 1 Thursday, December 12, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 12, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Funeral]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story.
Date:
March 12, 1991, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Mesquite fatal]
Video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story. This story aired at 6pm.
Date:
April 12, 1991, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bad WX]
Video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story. This story aired at 5pm.
Date:
April 12, 1991, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bad WX]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story. This story aired at 6pm.
Date:
April 12, 1991, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Standoff]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
March 12, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Chernoff bounds for Class-A noise
The goal is, using a very large passive array, to determine the performance limits of a detector. The signal of interest is narrowband with a Gaussian envelope, and the contaminating noise is multivariate Class-A. Two different multivariate models for the Class A family are presented. One of the models is appropriate for array processing applications. The data is spatially dependent and temporally independent. It is shown, in the spatially independent case, that the Chernoff approximation does closely approximate the performance of the optimal detector. It is shown the approximation improves as the number of samples increases. Unfortunately, it is also shown that the Chernoff approximation requires numerical evaluation of a M-dimensional integral. For the application here, M may be as large as 150, ruling out this approach. Two alternative approaches are examined. First, approximating the Class A model by a Gaussian model is shown to result in a poor approximation. Second, the exact likelihood ratio is approximated by a piece-wise function. While the approximation can be done with very good accuracy, the bound must be evaluated numerically. 10 refs., 11 figs.
Date:
August 12, 1991
Creator:
Nielsen, P.A.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Funeral]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
March 12, 1991, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Storm damage]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
April 12, 1991
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bigby sentence]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
March 12, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
HIV-1 intrapatient sequence diversity in the immunogenic V3 region
The third hypervariable domain (V3) of the human immunodeficiency virus type-1 (HIV-1) envelope protein (env) can serve as an epitope for potent type-specific neutralizing antibodies (NAbs) -- thus short peptides predicted on the most commonly found variants of the antigenic tip of the V3 loop have been considered as potential candidates for an HIV peptide vaccine. To evaluate the extent of intrapatient variation in the immunogenic crest of the V3 loop, sequence sets were analyzed from individuals for whom multiple V3 sequences were available. Several strategies for selecting the best sets of hexapeptides to represent the variable tip of the V3 loop were considered and their effectiveness was evaluated by comparing them with the sequence sets from individuals. Most individuals carried at least one, and frequently many, variants that did not match any of the sequences from among the ten most common hexapeptides. Intrapatient viral sequence variation was increased by including sequences derived from brain biopsy specimens as well as from blood. Additionally, sequences obtained from brain specimens of different individuals had common elements which were not conserved in the corresponding blood samples, suggesting that certain amino acids in the V3 loop may be requisite for viral propagation in the …
Date:
November 12, 1991
Creator:
Korber, B.; Myers, G. (Los Alamos National Lab., NM (United States)); Wolinsky, S.; Kunstman, K.; Levy, R.; Furtado, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Space propulsion by fusion in a magnetic dipole
A conceptual design is discussed for a fusion rocket propulsion system based on the magnetic dipole configuration. The dipole is found to have features well suited to space applications. Example parameters are presented for a system producing a specific power of 1 kW/kg, capable of interplanetary flights to Mars in 90 days and to Jupiter in a year, and of extra-solar-system flights to 1000 astronomical units (the Tau mission) in 20 years. This is about 10 times better specific power toward 10 kW/kg are discussed, as in an approach to implementing the concept through proof-testing on the moon. 21 refs., 14 figs., 2 tabs.
Date:
April 12, 1991
Creator:
Teller, E.; Glass, A.J.; Fowler, T.K. (Lawrence Livermore National Lab., CA (USA)); Hasegawa, A. (AT and T Bell Labs., Murray Hill, NJ (USA)) & Santarius, J.F. (Wisconsin Univ., Madison, WI (USA). Fusion Technology Inst.)
Object Type:
Article
System:
The UNT Digital Library