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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
Age of substitutability: or what do we do when the mercury runs out
None
Date:
September 18, 1975
Creator:
Goeller, H.E. & Weinberg, A.M.
Object Type:
Article
System:
The UNT Digital Library
Cooperation in the Marine Sciences Through the Intergovernmental Oceanographic Commission
This report discusses international cooperation in marine science through the Intergovernmental Oceanographic Commission (IOC) and the structure and activities of the organization.
Date:
September 18, 1970
Creator:
Price, Nancy C.
Object Type:
Report
System:
The UNT Digital Library
[Memorandum from Patsy Sharp to Jack Davis, September 18, 1991]
Photocopy of a memorandum from Patsy Sharp to Jack Davis discussing the invitation of Burger King franchise owner, Jack Jones, to lunch to thank him for his support of the Class Acts project. In addition, Tobye Poeschel and Bruce Raben's names are suggested as attendees to the lunch. Pete Lane and Bruce Burton are cc'd on the memorandum.
Date:
September 18, 1991
Creator:
Sharp, Patsy
Object Type:
Letter
System:
The UNT Digital Library
District Heating and Cooling Systems for Communities Through Power Plant Retrofit and Distribution Network, City of Piqua, Ohio: Volume 1 [Executive Summary]
The goal of the Piqua, Ohio District Heating and Cooling Demonstration Project is to demonstrate the feasibility and efficiency of using cogenerated thermal energy from the City's Municipal Power Plant to provide residential, commercial and industrial space heating and cooling and satisfy other community energy needs as appropriate. Progress in four tasks within this project is reported. These tasks include: development of team work plan resource allocation; identification of thermal energy source market; analysis of energy market; and planning of power plant retrofits. (LCL)
Date:
September 18, 1979
Creator:
Piqua (Ohio)
Object Type:
Report
System:
The UNT Digital Library
General purpose computers in real time
I see three main trends in the use of general purpose computers in real time. The first is more processing power. The second is the use of higher speed interconnects between computers (allowing more data to be delivered to the processors). The third is the use of larger programs running in the computers. Although there is still work that needs to be done, I believe that all indications are that the online need for general purpose computers should be available for the SCC and LHC machines. 2 figs.
Date:
September 18, 1989
Creator:
Biel, J.R.
Object Type:
Article
System:
The UNT Digital Library
District Heating and Cooling Systems for Communities Through Power Plant Retrofit and Distribution Network, City of Piqua, Ohio: Volume 2 [Full Report]
The feasibility analysis and evaluation of the Piqua, Ohio District Heating and Cooling Demonstration program is being conducted by the Piqua Municipal Power Co., the Piqua Law Dept., the Public Works Dept., a firm of economic analysts, and the Georgia Tech Engineering Dept. This volume contains information on the organization and composition of the demonstration team; characterization of the Piqua community; and the technical, environmental, institutional; financial, and economic assessments of the project. (LCL)
Date:
September 18, 1979
Creator:
Piqua (Ohio)
Object Type:
Report
System:
The UNT Digital Library
PRELIMINARY HOT SPOT ANALYSIS OF THE HFIR
None
Date:
September 18, 1961
Creator:
Hilvety, N.
Object Type:
Report
System:
The UNT Digital Library
Availability of enriched stable isotopes: present status and future prospects
The Electromagnetic Isotope Enrichment Facility (EMIEF) is currently used to produce 225 enriched stable isotopes of 50 elements. Among these are included most of the known elements with stable isotopes except for the noble gases, certain light elements, monisotopic elements, etc. The EMIEF can also be used to produce enriched samples of radioactive species, most notably the isotopes of uranium and plutonium. These enriched materials are placed in either the Sales Inventory of in the Research Materials Collection (RMC). The materials in the Sales Inventory are for sale to anyone on a first come, first served basis. Prices in the most recent catalog range from $0.05/mg for 99.8% /sup 140/Ce to $1,267/mg for 98.5% /sup 176/Lu. The materials in the RMC are made available to US researchers (or groups that include a US investigator) on a loan basis for use in non-destructive experiments and applications. In addition, certain samples have been provided to European investigators for cross-section studies through the auspices of EURATOM and the European-American Nuclear Data Committee. The status of the enriched isotopes included in the Sales Inventory is tabulated where isotopes are listed that are either not available or are in insufficient quantity or quality to meet …
Date:
September 18, 1986
Creator:
Hoff, R.W.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Democrat (Altus, Okla.), Vol. 6, No. 28, Ed. 1 Thursday, September 18, 1913
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1913
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Star. (Mangum, Okla. Terr.), Vol. 15, No. 11, Ed. 1 Thursday, September 18, 1902
Weekly newspaper from Mangum, Oklahoma that includes local, territorial, and national news along with advertising.
Date:
September 18, 1902
Creator:
Echols, R. C. & Townsend, G. B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Logan County News. (Crescent, Okla.), Vol. 11, No. 45, Ed. 1 Friday, September 18, 1914
Weekly newspaper from Crescent, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1914
Creator:
Frishman, Joseph
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Mirror (Mangum, Okla.), Vol. 1, No. 53, Ed. 1 Tuesday, September 18, 1917
Semi-weekly newspaper from Mangum, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1917
Creator:
Ryder, J. W.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Guthrie Daily News. (Guthrie, Okla. Terr.), Vol. 5, No. 1589, Ed. 1 Tuesday, September 18, 1894
Daily newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
September 18, 1894
Creator:
MacNamara, Major
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Weekly Oklahoma State Capital. (Guthrie, Okla.), Vol. 9, No. 25, Ed. 1 Saturday, September 18, 1897
Weekly newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
September 18, 1897
Creator:
Greer, Frank H.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guthrie Daily Star (Guthrie, Okla.), Vol. 9, No. 165, Ed. 1 Wednesday, September 18, 1912
Daily newspaper from Guthrie, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1912
Creator:
Hornaday, W. H.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The State Register. (Guthrie, Okla.), Vol. 11, No. 40, Ed. 1 Thursday, September 18, 1902
Weekly newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
September 18, 1902
Creator:
Trotter, M. P.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Weekly News. (Altus, Okla.), Vol. 20, No. 30, Ed. 1 Thursday, September 18, 1919
Weekly newspaper from Altus, Oklahoma that includes local, county, state, and national news along with advertising.
Date:
September 18, 1919
Creator:
Orr, J. P.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Foss Enterprise. (Foss, Okla.), Vol. 7, No. 45, Ed. 1 Friday, September 18, 1908
Weekly newspaper from Foss, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1908
Creator:
Huddlestun, Fred M.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Weekly Oklahoma State Capital. (Guthrie, Okla.), Vol. 9, No. 25, Ed. 2 Saturday, September 18, 1897
Weekly newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
September 18, 1897
Creator:
Greer, Frank H.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guymon Herald. (Guymon, Okla.), Vol. 29, No. 29, Ed. 1 Thursday, September 18, 1919
Weekly newspaper from Guymon, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1919
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Crowder City Guardian (Crowder, Oklahoma), Vol. 9, No. 52, Ed. 1 Friday, September 18, 1914
Weekly newspaper from Crowder, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1914
Creator:
Morrow, E. G.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guymon Herald. (Guymon, Okla.), Vol. 23, No. 28, Ed. 1 Thursday, September 18, 1913
Weekly newspaper from Guymon, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1913
Creator:
Zimmerman, Warren
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Crowder City Guardian (Crowder, Oklahoma), Vol. 3, No. 46, Ed. 1 Friday, September 18, 1908
Weekly newspaper from Crowder, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 18, 1908
Creator:
Barrow, A. E.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History