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CALCULATION OF THE REQUIREMENTS FOR OPERATION OF REFRACTORY-METAL COMPONENTS AT HIGH TEMPERATURE IN VACUUM
Equations based on kinetic theory relate the contamination of refractory metals in vacuum to the appropriate variables. Several examples are given for which the allowable system pressures are calculated. The examples illustrate the effect of varying several parameters. The importance of the sticking factor for active gases on hot refractory metals and its effect on the system design are discussed. The data for estimating the sticking factor for O/sub 2/ on Nb are given, along with some estimated values. Experimental data on the composition and rates of outgassing of ultrahigh-vacuum systems and their importance in system design are discussed. Several methods of reducing contamination rates and the relative ease and effectiveness of these methods are presented. It was concluded that tests of 1000 hr or longer will probably require system pressures of between 10/sup -9/ and 10/sup -6/ torr, the particular pressure depending upon the residual gas composition, test duration, allowable contamination level, and the other variables discussed. Since the most important source of contamination in a properly designed ultrahigh-vacuum system is the outgassing process, bakeable systems should be designed to operate with walls as cool as practical, and to have a minimum of surface area and outgassing materials inside. …
Date:
September 18, 1962
Creator:
Clausing, R.E.
Object Type:
Report
System:
The UNT Digital Library
RADIOISOTOPE AND RADIATION APPLICATIONS. Quarterly Progress Report
The study of the mechanism of free-radical formation and decay in polymeric materials was continued and extended to include an investigation of the potential application of this information to the development of novel graft copolymers. The study of postirradiation grafting techniques employing both peroxide initiation and direct grafting was continued. In addition, the effect of molecular weight on site formation was further investigated. Licenses and license applications for approximately 300 by-product material licenses were reviewed to obtain information on environmental conditions of source usage. The feasibility of testing sealed-source response to normal environments by accelerated test procedures was studied. Indications are that the approach will probably not be applicable to either vibration or abrasion stresses but may be for corrosion stresses. (auth)
Date:
October 18, 1962
Creator:
Sunderman, D.N., ed.
Object Type:
Report
System:
The UNT Digital Library
Mined Land Reclamation Requirements: Pro and Con
This report is about Mined Land Reclamation Requirements.
Date:
April 18, 1968
Creator:
Siehl, George H.
Object Type:
Report
System:
The UNT Digital Library
North Korea's Foreign Policy: The Meaning of the Pueblo and EC- 121 Incidents, 1969
This report is about the north korean policy
Date:
June 18, 1969
Creator:
Haggard, M. T.
Object Type:
Report
System:
The UNT Digital Library
National Assessment of Education: Selected References
This report provides a bibliography of resources related to the National Assessment of Education program administered by the Education Commission of the United States.
Date:
December 18, 1969
Creator:
Loo, Shirley
Object Type:
Report
System:
The UNT Digital Library
[News Script: Murder charges]
Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.
Date:
December 18, 1968
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
[News Script: Poison bean]
Script from the WBAP-TV/NBC station in Fort Worth, Texas, covering a broadcast news story.
Date:
December 18, 1968
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
[News Script: Dallas council]
Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.
Date:
November 18, 1968
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
[News Script: Drop appeals]
Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.
Date:
October 18, 1968
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
Major developments in United states foreign policy during the Kennedy administration, January 20 1961-November 23 1963: A brief selected chronology.
This report is about developments in the United States during the Kennedy administration.
Date:
May 18, 1967
Creator:
Whelan, Joseph G.
Object Type:
Report
System:
The UNT Digital Library
Draft Card Burning
This report deals exclusively with the necessity for Senate confirmation when an Associate Justice is elevated to the Chief Justice of the United States. The paper assumes sub silentio that Congress is in session when the appointment is made.
Date:
June 18, 1968
Creator:
Danner, Herbert A.
Object Type:
Report
System:
The UNT Digital Library
Calculation and Measurement of the Transient Temperature in a Low- Enrichment UO$sub 2$ Fuel Rod During Large Power Excursions
The results of Spert I in-pile transient tests of a rodtype, low- enrichment UO/sub 2/ fuel element are presented. The tests were performed to investigate the possibility of damage to such long thermal-time-constant fuel rods when subjected to short-period power excursions, and to test the effectiveness of an instrumentation technique for measurement of UO/sub 2/ fuel temperatures within the rods. In an initial series of power excursion tests, in which the range of reactor periods was from approximately 1 sec to 7.5 msec, simultaneous measurements were made of the transient temperature at the center of the fuel rod and at the outer cladding surface. Fuel rod rupture occurred during the exponential rise of the 7.5-msec excursion. Similar short-period tests performed on a second fuel rod contain ing no internal thermocouples did not result in cladding failure, supporting the postulation that rupture of the first rod was caused by waterlogging of the UO/sub 2/ as a result of the cladding penetrations made for installation of the internal thermocouples. Calculations of the transient temperature distribution in the fuel rod were made, and the results are found to be in good agreement with the experimental data obtained on the central-UO/sub 2/ and cladding-surface …
Date:
May 18, 1962
Creator:
Houghtaling, J. E.; Quigley, T. M. & Spano, A. H.
Object Type:
Report
System:
The UNT Digital Library
THE EXPERIMENTAL DESIGN FOR BeO IRAADIATION EXPERIMENTS ORNL 41-8 AND ORNL 41-9
The experimental plan for irradiating BeO pellets in Experiments ORNL 41- 8 and ORNL 41-9 was chosen in accordance with the principles of experimental design. The design is known by statisticians as a 2/sup 5/ factorial experiment confound'' in six replications. Five variables---size, density, grain size, temperature and time--are controlled at two levels to form the basic 2i factorial experiment. The sixth variable, neutron flux, is introduced by confounding on higher-order interactions. An explanation is presented in nontechnical language the means by which the aims of the experimenters and the physical conditions affecting the experiment were utilized in constructing the experimental design. (auth)
Date:
July 18, 1962
Creator:
Gardiner, D.A.
Object Type:
Report
System:
The UNT Digital Library
RADIOISOTOPES AND RADIATION APPLICATIONS. Quarterly Progress Report No. 12
Continued research is reported in the areas of intrinsic radioactive tracers for industrial process control and the effects of structural factors on radioinduced graft polymerization. The use of Be-- Po neutron sources for production of short-lived isotopes is being investigated. Data are included on the effects of target volume, high-Z scattering media, target-isotope concentration, and macroscopic cross-section on speciflc and total activation produced with a 10-curie source. Research on graft-polyerization concerning the effects of structure on freetinued. Results indicate that the radical formed in a variety of substituted methacrylate polymers is the same in all cases. (J.R.D.)
Date:
April 18, 1962
Creator:
Sunderman, D.N. ed.
Object Type:
Report
System:
The UNT Digital Library
An Algol Compiler for the Control Data Corporation 1604. Progress Report No. 2
A summary of the progress on development of the ALGOL compiler for the Control Data Corporation 1604 Computer is presented. This computer is based on machine-independent specifications developed at ORNL. A brief description of the structure of the compiler is included along with discussions concerning language restrictions, the hardware language representation, and the required equipment configuration. An example illustrates the generated program instructions. (auth)
Date:
October 18, 1962
Creator:
Bumgarner, L. L.; Grau, A. A.; Lietzke, M. P.; Stueland, R. G. & Wolf, K. A.
Object Type:
Report
System:
The UNT Digital Library
Buildup of Fission Products in Reactor Fuel and Coolant With 'Unclad' Fuel Material
Concentrations of fission products in the fuel and in the coolant stream of a generalized reactor power plant employing unclad fuel material were calculated using actual fission-product chains and wide ranges of assumed values of escape rate from the fuel and removal rate from the coolant stream. The calculations were made on an IBM 704 digital computer. Some typical results are displayed in the form of graphs to illustrate the effects of the variables. As data on escape rates from fuel and removal rates from coolant become available, the tables and graphs developed by this study can be used to estimate the fissionproduct concentration in the coolant stream, which would in turn furnish a basis for determining the degree of coolant purification required to maintain the circulating activity below a given level. (auth)
Date:
October 18, 1961
Creator:
Cottrell, W. B. & Mann, L. A.
Object Type:
Report
System:
The UNT Digital Library
Carbide Cathode Studies, Physical and Chemical Redeposition. Quarterly Progress Report, April 1, 1962-June 30, 1962
The utilization of physical and chemical processes to reduce the rate of vapor loss of thermionic emitters composed of mixed carbides of U and Zr in order to increase the permissible operating temperature is being studied. Preliminary, qualitative results obtained from study of physical redeposition processes showed that increasing the collector temperature may markedly reduce the rate of weight loss from a UC emitter operating at 2053 deg K. The requisite experimental equipment for studies of chemical transport processes was designed and constructed. Experiments will proceed through both a physical chemistry approach to an understanding of the transport processes and a technique to evaluate the efficacy of possible combinations of chemical species by monitoring the electron emission from diodes containing such mixtures. (auth)
Date:
July 18, 1962
Creator:
Weinberg, A. F.; Yang, L. & Langer, S.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Pilots]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about the 13th annual Skylady Derby and the arrival of the 14 competing pilots at Addison Airport in Dallas.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: King trial]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about the testimony of Dallas County Medical Examiner Dr. Earl F. Rose in the murder trial of Will Travis King.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Walker trial]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about jury deliberations in the libel suit brought by Edwin Walker against the Associated Press.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Piccadilly]
Video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story about continued civil rights demonstrations at the Piccadilly Cafeteria in Dallas, Texas and Judge Walker refusing to dismiss a restraining order which was issued against the demonstrators at the request of the cafeteria.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Carroll in court]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about a delay in the trial of Clifford Darrell Carroll fto allow for a psychiatric examination. Carroll is accused of participating in the beating death of Paula Bowman.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Commissioners]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about the Tarrant County Commissioners preparing to sell the largest bond issue in the county's history, slated for the Convention Center and Sports Stadium.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bearden trial]
Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a story about the acquittal of Clarence Bearden in the January death of his wife.
Date:
June 18, 1964
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library