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3-D treatment of convective flow in the earth's mantle
A three-dimensional finite-element method is used to investigate thermal convection in the earth's mantle. The equations of motion are solved implicitly by means of a fast multigrid technique. The computational mesh for the spherical problem is derived from the regular icosahedron. The calculation described use a mesh with 43,554 nodes and 81,920 elements and were run on a Cray X. The earth's mantle is modeled as a thick spherical shell with isothermal, free-slip boundaries. The infinite Prandtl number problem is formulated in terms of pressure, density, absolute temperature, and velocity and assumes an isotropic Newtonian rheology. Solutions are obtained for Rayleigh numbers up to approximately 10/sup 6/ for a variety of modes of heating. Cases initialized with a temperature distribution with warmer temperatures beneath speading ridges and cooler temperatures beneath present subduction zones yield whole-mantle convection solutions with surface velocities that correlate well with currently observed plate velocities. 8 references, 6 figures.
Date:
May 1, 1984
Creator:
Baumgardner, J.R.
Object Type:
Article
System:
The UNT Digital Library
4. pi. data of relativistic nuclear collisions. [Plastic ball]
During the past two years, complete events of relativistic nuclear collisions are being studied with the Plastic Ball, the first electronic nonmagnetic particle-identifying 4..pi.. spectrometer. It is well suited to handle the large multiplicities in these reactions and allows collection of data at a rate sufficient to make further software selections to look at rare events. The analysis of the data follows various lines covering topics like thermalization, stopping or transparency, cluster-production mechanism (--can it tell entropy), search for collective flow through various global analyzing methods that allow determination of the scattering plane, projectile fragmentation (--is there a bounce-off), pion distribution, two-particle correlations: Hanbury-Brown Twiss, and excited nuclear states (--nucleosynthesis at the freezeout point or from chemical equilibrium). We will cover in this contribution only two subjects: stopping and thermalization and cluster production.
Date:
May 1, 1983
Creator:
Gutbrod, H.H.; Gustafsson, H.A. & Kolb, B.
Object Type:
Article
System:
The UNT Digital Library
5 K neutron irradiation and thermal cycling of NbTi superconductors
Simulation experiments of magnet operating conditions in a fusion reactor are reported. After approximately half of the lifetime dose the results on a variety of NbTi superconductors show moderate changes of the critical current density j/sub c/ (approx. 10%), the percentage change of j/sub c/ is always larger at high fields (8 T) than at 5 T. After a rapid initial change the resistivity ratios of the Cu-stabilizer are found to decrease only slowly with increasing neutron fluence.
Date:
May 1, 1984
Creator:
Hahn, P.; Hoch, H.; Weber, H. W.; Birtcher, R. C. & Brown, B. S.
Object Type:
Article
System:
The UNT Digital Library
6. 4 Tesla dipole magnet for the SSC
A design is presented for a dipole magnet suitable for the proposed SSC facility. Test results are given for model magnets of this design 1 m long and 4.5 m long. Flattened wedge-shaped cables (''keystoned'') are used in a graded, two-layer ''cos theta'' configuration with three wedges to provide sufficient field uniformity and mechanical rigidity. Stainless steel collars 15 mm wide, fastened with rectangular keys, provide structural support, and there is a ''cold'' iron flux return. The outer-layer cable has 30 strands of 0.0255 in. dia NbTi multifilamentary wire with Cu/S.C. = 1.8, and the inner has 23 strands of .0318 in. dia wire with Cu/S.C. = 1.3. Performance data is given including training behavior, winding stresses, collar deformation, and field uniformity.
Date:
May 1, 1985
Creator:
Taylor, C.E.; Caspi, S.; Gilbert, W.; Meuser, R.; Mirk, K.; Peters, C. et al.
Object Type:
Article
System:
The UNT Digital Library
[16 :10 sec spot clip PSA compilation, 2]
Video recording from The Black Academy of Arts and Letters including a series of :10 sec PSAs for the Junior Black Academy to be aired May 21st 1989. Each PSA is preceded by a slide of the creation information. The footage features celebrities' active in the organization and from a variety of arts reciting the same script.
Date:
May 1989
Creator:
GrimCo Productions
Object Type:
Video
System:
The UNT Digital Library
65 Minutes, May-June 1989
Bimonthly newsletter of Denton Boy Scout Troop 65 containing a list of upcoming events, news and announcements, and other information for members.
Date:
May 1989
Creator:
Boy Scouts of America. Troop 65 (Denton, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
324 and 325 Building Hot Cell Cleanout Program: Air lock cover block refurbishment
The high-density concrete cover blocks shielding the pipe trench in the hot-cell air lock of the 324 Building Radiochemical Engineering Cells had accumulated fixed radioactivity ranging from 1100 to 22, 000 mrad/hr. A corresponding increase in the radiation exposure to personnel entering the air lock, together with ALARA concerns, led to the removal of the contaminated concrete surface with a hydraulic spaller and the emplacement of a stainless steel covering over a layer of grout. The resultant saving in radiation exposure is estimated to be 7200 mrad for personnel completing burial box runs for the 324 and 325 Building Hot Cell Cleanout Program. Radiation exposure to all staff members entering the air lock is now at least 50% lower. 3 refs., 22 figs., 1 tab.
Date:
May 1, 1989
Creator:
Katayama, Y.B.; Holton, L.K. Jr. & Gale, R.M.
Object Type:
Report
System:
The UNT Digital Library
1170-MW(t) HTGR-PS/C plant application-study report: alumina-plant application
This report considers the HTGR-PS/C application to producing alumina from bauxite. For the size alumina plant considered, the 1170-MW(t) HTGR-PS/C supplies 100% of the process steam and electrical power requirements and produces surplus electrical power and/or process steam, which can be used for other process users or electrical power production. Presently, the bauxite ore is reduced to alumina in plants geographically separated from the electrolysis plant. The electrolysis plants are located near economical electric power sources. However, with the integration of an 1170-MW(t) HTGR-PS/C unit in a commercial alumina plant, the excess electric power available (approx. 233 MW(e)) could be used for alumina electrolysis.
Date:
May 1981
Creator:
Rao, R.; McMain, A. T., Jr. & Stanley, J. D.
Object Type:
Report
System:
The UNT Digital Library
1170-MW(t) HTGR-PS/C plant application study report: Geismar, Louisiana refinery/chemical complex application
This report summarizes a study to apply an 1170-MW(t) high-temperature gas-cooled reactor - process steam/cogeneration (HTGR-PS/C) to an industrial complex at Geismar, Louisiana. This study compares the HTGR with coal and oil as process plant fuels. This study uses a previous broad energy alternative study by the Stone and Webster Corporation on refinery and chemical plant needs in the Gulf States Utilities service area. The HTGR-PS/C was developed by General Atomic (GA) specifically for industries which require both steam and electric energy. The GA 1170-MW(t) HTGR-PC/C design is particularly well suited to industrial applications and is expected to have excellent cost benefits over other energy sources.
Date:
May 1, 1981
Creator:
McMain, Jr., A. T. & Stanley, J. D.
Object Type:
Report
System:
The UNT Digital Library
1170-MW(t) HTGR-PS/C plant application study report: shale oil recovery application
The US has large shale oil energy resources, and many companies have undertaken considerable effort to develop economical means to extract this oil within environmental constraints. The recoverable shale oil reserves in the US amount to 160 x 10/sup 9/ m/sup 3/ (1000 x 10/sup 9/ bbl) and are second in quantity only to coal. This report summarizes a study to apply an 1170-MW(t) high-temperature gas-cooled reactor - process steam/cogeneration (HTGR-PS/C) to a shale oil recovery process. Since the highest potential shale oil reserves lie in th Piceance Basin of Western Colorado, the study centers on exploiting shale oil in this region.
Date:
May 1, 1981
Creator:
Rao, R. & McMain, A.T. Jr.
Object Type:
Report
System:
The UNT Digital Library
1170-MW(t) HTGR-PS/C plant application study report: SRC-II process application
The solvent refined coal (SRC-II) process is an advanced process being developed by Gulf Mineral Resources Ltd. (a Gulf Oil Corporation subsidiary) to produce a clean, non-polluting liquid fuel from high-sulfur bituminous coals. The SRC-II commercial plant will process about 24,300 tonnes (26,800 tons) of feed coal per stream day, producing primarily fuel oil plus secondary fuel gases. This summary report describes the integration of a high-temperature gas-cooled reactor operating in a process steam/cogeneration mode (HTGR-PS/C) to provide the energy requirements for the SRC-II process. The HTGR-PS/C plant was developed by General Atomic Company (GA) specifically for industries which require energy in the form of both steam and electricity. General Atomic has developed an 1170-MW(t) HTGR-PS/C design which is particularly well suited to industrial applications and is expected to have excellent cost benefits over other sources of energy.
Date:
May 1, 1981
Creator:
Rao, R. & McMain, A. T., Jr.
Object Type:
Report
System:
The UNT Digital Library
1170-MW(t) HTGR-PS/C plant application study report: tar sands oil recovery application
This report summarizes a study to apply an 1170-MW(t) high-temperature gas-cooled reactor - process steam/cogeneration (HTGR-PS/C) to tar sands oil recovery and upgrading. The raw product recovered from the sands is a heavy, sour bitumen; upgrading, which involves coking and hydrodesulfurization, produces a synthetic crude (refinable by current technology) and petroleum coke. Steam and electric power are required for the recovery and upgrading process. Proposed and commercial plants would purchase electric power from local utilities and obtain from boilers fired with coal and with by-product fuels produced by the upgrading. This study shows that an HTGR-PS/C represents a more economical source of steam and electric power.
Date:
May 1, 1981
Creator:
Rao, R. & McMain, Jr., A. T.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 10, No. 28, Ed. 1 Wednesday, May 6, 1981
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 6, 1981
Creator:
Cain, Shannon
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 10, No. 29, Ed. 1 Wednesday, May 27, 1981
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 27, 1981
Creator:
Combs, Terrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 11, No. 28, Ed. 1 Wednesday, May 5, 1982
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 5, 1982
Creator:
Thomas, Betty
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 11, No. 29, Ed. 1 Wednesday, May 26, 1982
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 26, 1982
Creator:
Stephens, Sandra A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 12, No. 26, Ed. 1 Thursday, May 5, 1983
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 5, 1983
Creator:
Kuhlman, Judy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 12, No. 27, Ed. 1 Thursday, May 26, 1983
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 26, 1983
Creator:
Stephens, Sandra A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 14, No. 25, Ed. 1 Thursday, May 2, 1985
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 2, 1985
Creator:
Defrange, Mark
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 15, No. 28, Ed. 1 Friday, May 1, 1987
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 1, 1987
Creator:
Passagno, Aisa
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 15, No. 28, Ed. 1 Monday, May 5, 1986
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 5, 1986
Creator:
Intrieir, Danette
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 15, No. 29, Ed. 1 Friday, May 8, 1987
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 8, 1987
Creator:
Passagno, Aisa
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 16, No. 29, Ed. 1 Friday, May 6, 1988
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 6, 1988
Creator:
Patrick, Lurah
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 17, No. 29, Ed. 1 Friday, May 5, 1989
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 5, 1989
Creator:
Pierce, James
Object Type:
Newspaper
System:
The Gateway to Oklahoma History