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298 Matching Results
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Top students get preview of NT academy
Article by Dawn Bennett-Cobb, reviewing the Texas Academy of Mathematics and Science preview day, and giving on overview of how the academy came into being.
Date:
January 31, 1988
Creator:
Bennett-Cobb, Dawn
Object Type:
Clipping
System:
The UNT Digital Library
[Four Pages from Leadership News, March 1988]
Four pages from a newsletter including an article discussing various schools with dedicated math and science programs, including the Texas Academy of Mathematics and Science.
Date:
March 31, 1988
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
[News Clip: Devil House]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date:
October 31, 1988, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: DWI Preps]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6pm.
Date:
December 31, 1988, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Absentee voting]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.
Date:
October 31, 1988, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Probation Office N. Dallas]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6pm.
Date:
October 31, 1988, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[Financial report: Aug 1988 Lesbian/Gay Political Coalition]
Financial report of the LGPC as of August 1988. Includes handwritten notes on back side titled "Lesbian Political Agenda."
Date:
August 31, 1988
Creator:
Lesbian/Gay Political Coalition
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 80, No. 13, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
March 31, 1988
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 98, No. 13, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
March 31, 1988
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Symmetry breaking: The standard model and superstrings
The outstanding unresolved issue of the highly successful standard model is the origin of electroweak symmetry breaking and of the mechanism that determines its scale, namely the vacuum expectation value (vev)v that is fixed by experiment at the value v = 4m//sub w//sup 2///g/sup 2/ = (..sqrt..2G/sub F/)/sup /minus/1/ approx. = 1/4 TeV. In this talk I will discuss aspects of two approaches to this problem. One approach is straightforward and down to earth: the search for experimental signatures, as discussed previously by Pierre Darriulat. This approach covers the energy scales accessible to future and present laboratory experiments: roughly (10/sup /minus/9/ /minus/ 10/sup 3/)GeV. The second approach involves theoretical speculations, such as technicolor and supersymmetry, that attempt to explain the TeV scale. 23 refs., 5 figs.
Date:
August 31, 1988
Creator:
Gaillard, M. K.
Object Type:
Article
System:
The UNT Digital Library
The Bogata News (Bogata, Tex.), Vol. 77, No. 25, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1988
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Reminiscences of a particle physicist
This paper discusses some historical aspects of particle physics. (LSP)
Date:
August 31, 1988
Creator:
Goldhaber, M.
Object Type:
Article
System:
The UNT Digital Library
Prospects of TEVATRON upgrade
Following a brief review of the 1987 Fermilab collider run and the present status of the 1988 run, upgrade plans for the near-term (1988-1992) are described. For further luminosity upgrades beyond 1992, several scenarios are currently being discussed, one of which includes the construction of two new 20 GeV rings which could raise the proton-antiproton collider luminosity by a factor of 50 over the original Tevatron I design. Another possible project, the construction of a high luminosity proton-proton collider, has also been investigated in detail. A third scenario, involving a new Main Injector to replace the Main Ring and a new higher energy superconducting synchrotron, is presently being examined. It is hoped that this will result in a proposal to be submitted to DOE for FY91. The major issues concerning these options are presented. 8 figs., 1 tab.
Date:
August 31, 1988
Creator:
Syphers, M.J.
Object Type:
Article
System:
The UNT Digital Library
Writing SUBROUTINE HOWFAR for EGS4
The purpose of this note is to provide guidance, in addition to that given in SLAC-265, in writing SUBROUTINE HOWFAR for both simple and complex geometrical situations. Since most complex geometries can be represented in terms of blocks of simpler geometries, a number of geometry subprograms have been created for use within HOWFAR. They are provided as part of the EGS4 Code System, which means that they are located in files on the EGS4 disk under VM/SP at SLAC. They are also on the EGS4 Distribution Tape that is given out on request by the SLAC Radiation Physics Group. What we hope to accomplish with this note is to show how to create EGS4 geometries in a modular fashion, with particular emphasis on using the macro equivalents of the subroutines in order to gain efficiency. It is assumed that the reader is already familiar with EGS4 and understands the role of the variables USTEP, IDISC, and IRNEW as they apply to SUBROUTINE HOWFAR. If not, then the reader is advised to study Appendix 2 of SLAC-265 first. The tutorial chapter may also provide some insight. 5 refs., 10 figs.
Date:
August 31, 1988
Creator:
Nelson, W. R. & Jenkins, T. M.
Object Type:
Report
System:
The UNT Digital Library
Development of a 10-decade single-mode reactor flux monitoring system
Conventional wide-range neutron channels employ three optional modes to monitor the required flux range from source levels to full power (typically 10 or more decades). Difficult calibrations are necessary to provide a continuous output signal when such a system switches from counting mode in the source range to mean-square voltage mode in the midrange to dc current mode in the power range. In an ORNL proof-of-principle test, a method of extended range counting was implemented with a fission counter and conventional wide-band pulse processing electronics to provide a single-mode, monotonically increasing signal that spanned /approximately 10/ decades of neutron flux. Ongoing work includes design, fabrication, and testing of a comlpete neutron flux monitoring system suitable for advanced liquid metal reactor designs. 6 refs., 4 figs.
Date:
March 31, 1988
Creator:
Valentine, K.H.; Shepard, R.L.; Falter, K.G. & Reese, W.B.
Object Type:
Article
System:
The UNT Digital Library
The Cherokeean. (Rusk, Tex.), Vol. 140, No. 8, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 31, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Rio Grande Herald (Rio Grande City, Tex.), No. 21, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Rio Grande City, Texas that includes local, state and national news along with extensive advertising.
Date:
March 31, 1988
Creator:
Roberts, Kenneth
Object Type:
Newspaper
System:
The Portal to Texas History
Slurry phase Fischer-Tropsch synthesis: Cobalt plus a water-gas shift catalyst. [Quarterly] report, October 1, 1988--December 31, 1988
A cobalt Fischer-Tropsch catalyst (CO/MgO/silica) was reduced and slurried in combination with reduced Cu/ZnO/Al{sub 2}0{sub 3} water-gas-shift catalyst. Combined catalyst system was run at fixed process conditions for more than 400 hours. The system showed stable selectivity. The Cu/ZnO/Al{sub 2}0{sub 3} water-gas-shift catalyst remained reasonably active in the presence of the cobalt catalyst. Hydrocarbon selectivity of the cobalt and Cu/ZnO/Al{sub 2}0{sub 3} catalyst system compared favorably to selectivity of iron-based catalysts. Methane selectivity was slightly higher for the cobalt-based system, but C{sub 5}{sup +} selectivity was essentially the same. The hydrocarbon product distribution appeared to exhibit a double-a behavior. a{sub 1} was near 0.80 which is higher than that of iron catalysts, while a{sub 2} was calculated to be 0.86 which is somewhat lower than would be typical for an iron-based catalyst.
Date:
December 31, 1988
Creator:
Yates, I. C. & Satterfield, C. N.
Object Type:
Report
System:
The UNT Digital Library
Pyrolysis and gasification of coal at high temperatures. Quarterly progress report No. 2, December 15, 1987--March 15, 1988
The effects of particle size on the macropore structure of chars produced from an Illinois No. 6 coal were investigated. Three size fractions (100--120, 50--60 and 25--28 mesh) of coal particles were pyrolyzed in our captive-sample reactor at 10{degrees}C/s. By analyzing digitized particle cross-sections, we obtained the macropore volume distributions and surface areas, and determined that all three char samples had almost equal macroporosities. we have also analyzed for the first time the shape or boundary tortuosity of the macropores. As the size of the pyrolyzed coal particles increased, the produced chars exhibited macropores with more tortuous boundaries. Tortuous pore boundaries result in higher values for the true macropore surface areas and should enhance the reactivity of the char samples. A systematic procedure was developed for analyzing and averaging the simulation results obtained with our erosion models. Such a procedure is necessary for comparing statistical model predictions to experimental data. Several simulations were carried out to investigate the gasification behavior of the three char samples mentioned above and the predicted reactivity patterns are presented. Finally, a thermogravimetric analyzer (TGS-2) was ordered and will soon be delivered to our laboratory.
Date:
December 31, 1988
Creator:
Zygourakis, K.
Object Type:
Report
System:
The UNT Digital Library
Calculation of radiation dose rates from a spent nuclear fuel shipping cask
Radiation doses from a spent nuclear fuel cask are usually from various phases of operations during handling, shipping, and storage of the casks. Assessment of such doses requires knowledge of external radiation dose rates at various locations surrounding a cask. Under current practices, dose rates from gamma photons are usually estimated by means of point- or line-source approaches incorporating the conventional buildup factors. Although such simplified approaches may at times be easy to use, their accuracy has not been verified. For example, those simplified methods have not taken into account influencing factors such as the geometry of the cask and the presence of the ground surface, and the effects of these factors on the calculated dose rates are largely unknown. Moreover, similar empirical equations for buildup factors currently do not exist for neutrons. The objective of this study is to use a more accurate approach in calculating radiation dose rates for both neutrons and gamma photons from a spent fuel cask. The calculation utilizes the more sophisticated transport method and takes into account the geometry of the cask and the presence of the ground surface. The results of a detailed study of dose rates in the near field (within 20 …
Date:
December 31, 1988
Creator:
Chen, S. Y. & Yuan, Y. C.
Object Type:
Article
System:
The UNT Digital Library
Energy transfer processes in solar energy conversion. Progress report, January 1, 1988--December 31, 1988
The program involves the investigation of excitation transport and electron transfer in complex systems. In the area of electron transfer, we have been studying electron back transfer following donor-acceptor photoinduced electron transfer. We are addressing this problem both theoretically and experimentally. In the area of excitation transport, we have been examining transport in solid solutions, liquid solutions, and in clustered excitation transport systems. Again, we are pursuing both experimental and theoretical approaches. The problem of electron back transfer between photogenerated ions is of central importance in both artificial and biological solar energy conversion. Once an electron has been transferred from an optically excited donor to an acceptor, back transfer competes with the ability of the radical ions to go on to do useful chemistry. We are studying the back transfer process using picosecond transient grating experiments in conjunction with time resolved and steady state fluorescence quenching measurements. The transient grating experiments makes the back transfer process a direct experimental observable, while the fluorescence experiments allow the forward transfer to be examined. By combining the experiments, a complete picture emerges. 10 refs.
Date:
December 31, 1988
Creator:
Fayer, M. D.
Object Type:
Report
System:
The UNT Digital Library
Development of the chemical and electrochemical coal cleaning process. First quarterly technical progress report, April 1, 1988--June 30, 1988
The objectives of this effort are (a) to learn the mechanisms by which the Chemical and Electrochemical Coal Cleaning (CECC) process removes pyritic sulfur and ash from coal, (b) to learn more about the operating parameters of the process, (c) to collect engineering information for scale-up of the process, and (d) to test the CECC process on a bench-scale continuous operation.
Date:
December 31, 1988
Creator:
Yoon, R. H.
Object Type:
Report
System:
The UNT Digital Library
Development and process evaluation of improved Fischer-Tropsch slurry catalysts. Sixth quarterly technical progress report, 1 January--31 March 1988
The objective of this contract is to develop a consistent technical data base on the use of iron-based catalysts in Fischer-Tropsch (FT) synthesis reactions. This data base will be developed to allow the unambiguous comparison of the performance of these catalysts with each other and with state-of-the-art iron catalyst comparisons. Particular attention will be devoted to generating reproducible kinetic and selectivity data and to developing reproducible improved catalyst compositions.
Date:
December 31, 1988
Creator:
Withers, H. P.; Bukur, D. B. & Rosynek, M. P.
Object Type:
Report
System:
The UNT Digital Library
Arctic hydrology and meteorology. Annual report
The behavior of arctic ecosystems is directly related to the ongoing physical processes of heat and mass transfer. Furthermore, this system undergoes very large fluctuations in the surface energy balance. The buffering effect of both snow and the surface organic soils can be seen by looking at the surface and 40 cm soil temperatures. The active layer, that surface zone above the permafrost table, is either continually freezing or thawing. A large percentage of energy into and out of a watershed must pass through this thin veneer that we call the active layer. Likewise, most water entering and leaving the watershed does so through the active layer. To date, we have been very successful at monitoring the hydrology of Imnavait Creek with special emphasis on the active layer processes. The major contribution of this study is that year-round hydrologic data are being collected. An original objective of our study was to define how the thermal and moisture regimes within the active layer change during an annual cycle under natural conditions, and then to define how the regime will be impacted by some imposed terrain alteration. Our major analysis of the hydrologic data sets for Imnavait Creek have been water balance …
Date:
December 31, 1988
Creator:
Kane, D. L.
Object Type:
Report
System:
The UNT Digital Library