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Fundamental Studies of Erosion for Coal Gasification Systems. Annual Progress Report, 1 November 1979-30 June 1980
The effort in this program is divided between modelling the particle impact event using numerical methods and computer calculations and actual measurement of erosion rates. While the results obtained from each of these activities must be combined to provide an improved understanding of particulate erosion of ductile materials, it is convenient to describe separately the progress in each activity area. The first step in the application of the finite element method to any problem is the dissolution of the continuum into small elements. The intent of this procedure is to use as few total elements as possible and to make the elements small where gradients are large and vice versa. The exact solution for the contact of a rigid cylinder with an elastic surface is available from Hertz. This solution has been compared with the computer results obtained from finite element maps containing 148, 273, and 474 elements. The correlation between the computer results and elastic solution is not good for the map with the fewest elements, but improves as the number of elements increases. Convergence to this exact solution has been examined as a function of the number of map elements as a means of improving the efficiency of …
Date:
July 27, 1980
Creator:
Follansbee, P. S.; Sinclair, G. B. & Williams, J. C.
Object Type:
Report
System:
The UNT Digital Library
Preliminary designs for ocean thermal energy conversion (OTEC) stationkeeping subsystems (SKSS). Task II. Conceptual design. Final report
The study is presented in five sections: design loads, conceptual designs, trade studies, cost analysis and concept evaluation and ranking. Extensive appendixes provide back up calculations and data to support the results. Environmental forces and yaw moments acting on the barge and spar in the various design sea states are presented including wave, wind and current effects. A parametric analysis illustrates the impact on holding power requirement of varying the return periods for operational and extreme sea state. The conceptual designs are presented for the barge followed by those for the spar, including configuration definition, performance characteristics, interfaces, areas for development, and deployment scenarios for selected concepts. The concept definition is followed by a set of trade studies that were performed to evaluate candidate anchor types and anchor leg materials. Parametric variations in anchor leg characteristics, wire-rope-to-chain length ratio for example, illustrate the influence of the significant design parameters on performance. An extensive cost analysis of the candidate SKSS concepts is presented, including cost estimates, life cycle cost scenarios leading to expected value of life cycle cost, and cost equivalence of operational failures. An evaluation of the eight SKSS concepts is presented, including assessment of performance and rankings based on …
Date:
July 27, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
AN ESTIMATE OF THE EFFECT OF NEUTRON-ENERGY SPECTRUM ON RADIATION DAMAGE OF STEEL
The postulate that the average number of lattice displacements is directly proportional to the available energy is carried one step further; it is assumed that damage to steel (particularly in regard to brittle fracture) is proportional to the number of lattice vacancies that occur. The model, although crude, permits estimation of the relative damage resulting from differences in neutron spectra. The results can be used as a rough method of correcting damage data for the effect of the neutron-energy spectrum. Radiation damage calculations for steel, relative to those for a fission spectrum, were made for neutron spectra that result from fission neutrons penetrating water or graphite. The results were plotted as a function of effective distance from the fission source. From this plot it is possible to make a conservative estimate of the correction factor to apply to damage data obtained with different neutron spectra. (auth)
Date:
July 27, 1962
Creator:
Claiborne, H.C.
Object Type:
Report
System:
The UNT Digital Library
EFFECTIVE CUTOFF ENERGIES FOR B, Cd, Gd, AND Sm FILTERS
Effective energy cutoffs have been calculated on an IBM7090 computer for Cd, Gd, Sm, and B filters as functions of filter geometry, the ratio of Maxwellian to epithermal flux (assumed to be 1/E), the lower energy limit of the 1/E flux, the energy corresponding to the Maxwellian most probable (modal) velocity and filter thickness. The geometrical configurations were spherical (which on the assumptions madc is equivalent to a beam flux case), cylindrical and slab. By the use of two or three different filters (Cd and Gd and perhaps Sm) it should be possible to detect resonances in the thermal to cutoff energy regions, in addition to measuring resonance integrals and thermial cross sections of unknown nuclides. (auth)
Date:
July 27, 1962
Creator:
Stoughton, R.W. & Halperin, J.
Object Type:
Report
System:
The UNT Digital Library
Temperature Coefficients of the Reactivity Measurement Facility
The temperature coefficient of the Reactivity Measurement Facility was found to be 49 plus or minus 1 mu k/ deg C (1 mu k = 10/sup -6/ DELTA k/k) in the range 15.4 to l7.8 deg C. The change in the net reactivity of a standard sample was --0.48 plus or minus 0.02, --0.66 plus or minus 0.03, and --0.78 plus or minus 0.02 mu k/ deg C in three measuring positions. These low values generally make temperature corrections insignificant. The above results are compared with previous determined values. This information developed in the RMF should be generally applicable to flux-trap-type reactors such as the Advanced Reactivity Measurement Facility (ARMF) and ARMF-ll, now under construction. RMF was dismantled in April 1962. (auth)
Date:
July 27, 1962
Creator:
Fast, E.
Object Type:
Report
System:
The UNT Digital Library
Minutes of IEG Deliberations of 4 March 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
State Input - Video (VHS) entitled BRAC Community Meeting 5 July 2005
VHS entitled BRAC Community Meeting 5 July 2005 - California Regional Hearing - available for review at the BRAC Commission library
Date:
July 27, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 26 February 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
General Counsel Suffieciency Letter USAF 0122
Letter from Special Counsel (BRAC) Martin Pankove regarding an attachment for BRAC candidate recommendation USAF 0122.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Letter
System:
The UNT Digital Library
Minutes of IEG Deliberations of 5 February 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 20 January 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 9 December 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Community Input - Book - Naval Air Station Brunswick - Maine
Community Input - 2004 Report to the Defense Base Closure and Realignment Commission prepared by NAS Brunswick Task Force Chamber of Commerce of the Bath/Brunswick Region
Date:
July 27, 2005
Creator:
unknown
Object Type:
Book
System:
The UNT Digital Library
Minutes of IEG Deliberations of 04 December 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 13 November 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 23 October 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Base Input - Naval Base Ventura County
narrative Descriptive of Electronic Warfare Facilities at NAVAIR Point Mugu, CA Prepared at the requests of BRAC Commission staff Les Farrington and David Epstein
Date:
July 27, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 2 October 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 11 September 2003
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 16 September 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 29 June 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 9 September 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Minutes of IEG Deliberations of 5 August 2004
Memorandum - Minutes of the Infrastructure Evaluation Group(IEG). Including meeting agenda, a report, and any other additional information from the meeting.
Date:
July 27, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Base Input - Navy Weapons Station Seal Beach
Base Input - Documents provided to BRAC Commission that consist of: recommendations and Justifications NWS Seal Beach, CA,;NSWC PHD BRAC Clarification and COBRA Issues forwarded to NSWC dtd 14 July 2005; NWS Seal Beach - Container Repair
Date:
July 27, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library