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442 Matching Results
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[Letter from Cassandra Broadus to Donna Engles, December 6, 1990]
Photocopy of a letter from Cassandra Broadus, North Texas Institute for Educators on the Visual Arts, to Donna Engels, Evers Park Elementary School. In regards to an upcoming class visitation on January 8th and how Broadus will plan to present a lesson dealing with winter. Broadus plans on bringing a reproduction of a winter landscape or something visually similar, in order to get the children to talk about the art.
Date:
December 6, 1990
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
Thulium-170 heat source
An isotopic heat source is formed using stacks of thin individual layers of a refractory isotopic fuel, preferably thulium oxide, alternating with layers of a low atomic weight diluent, preferably graphite. The graphite serves several functions: to act as a moderator during neutron irradiation, to minimize bremsstrahlung radiation, and to facilitate heat transfer. The fuel stacks are inserted into a heat block, which is encased in a sealed, insulated and shielded structural container. Heat pipes are inserted in the heat block and contain a working fluid. The heat pipe working fluid transfers heat from the heat block to a heat exchanger for power conversion. Single phase gas pressure controls the flow of the working fluid for maximum heat exchange and to provide passive cooling.
Date:
September 6, 1990
Creator:
Walter, Carl E.; Van Konynenburg, Richard & VanSant, James H.
Object Type:
Report
System:
The UNT Digital Library
Experimental development of nuclear pumped laser candidate for inertial confinement fusion driver
A report is given on progress made during the second year of a three year contract studying the feasibility of nuclear pumping the atomic iodine laser. Experimental results are presented showing efficiencies of 25--38% at converting neutron-induced nuclear reaction energy in the excimer XeBr into UV photons which can be used to pump the laser. Parametric studies were done utilizing the {sup 10}B(n,{alpha}){sup 7}Li reaction, with three bromine donor chemicals, over a range of pressures and mix ratios, to optimize the fluorescence efficiency.
Date:
June 6, 1990
Creator:
Miley, George H.
Object Type:
Report
System:
The UNT Digital Library
Innovative Clean Coal Technology (ICCT): Demonstration of innovative applications of technology for cost reductions to the CT-121 FGD process
The objective of this project is to demonstrate on a commercial scale several innovative applications of cost-reducing technology to the Chiyoda Thoroughbred-121 (CT-121) process. CT-121 is a second generation flue gas desulfurization (FGD) process which is considered by the Electric Power Research Institute (EPRI) and Southern Company Services (SCS) to be one of the most reliable and lowest cost FGD options for high-sulfur coal-fired utility boiler applications. Demonstrations of the innovative design approaches will further reduce the cost and provide a clear advantage to CT121 relative to competing technology.
Date:
August 6, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ductile nickel-silicon alloy
An improvement over prior compositions wherein the ductility of Ni-Si alloys are improved with minor alloying additions of hafnium or zirconium.
Date:
August 6, 1990
Creator:
Oliver, W. C.
Object Type:
Patent
System:
The UNT Digital Library
Physics at the Planck scale
Effective supergravity theories suggested by superstrings can be explored to determine their potential for successfully describing both observed physics at zero temperature and an inflationary cosmology. An important ingredient in this study is the dynamics of gaugino condensation, which has been the subject of recent activity. 33 refs., 2 figs.
Date:
December 6, 1990
Creator:
Gaillard, M.K. (Lawrence Berkeley Lab., CA (USA) California Univ., Berkeley, CA (USA). Dept. of Physics)
Object Type:
Article
System:
The UNT Digital Library
[Letter from Herbet Holl to William McCarter, June 6, 1990]
Photocopy of a letter from Herbert Holl, executive director of the Greater Denton Arts Council, to William McCarter, co-director of North Texas Institute for Educators on the Visual Arts. The letter is in regards to the April 1990 grant award and Holl has enclosed an award for the amount of $750.00 for North Texas Institute for Educators on the Visual Arts.
Date:
June 6, 1990
Creator:
Holl, Herbert
Object Type:
Letter
System:
The UNT Digital Library
Fish and Wildlife Service: Compensation to Local Governments
The Refuge Revenue Sharing Fund (RRSF) was enacted in response to the concern of local governments regarding losses to their tax base due to the presence of federally owned land under the jurisdiction of the Fish and Wildlife Service. This report outlines recent history of RRSF payment levels. It examines the RRSF and describes how the fund differs in its treatment of reserved and acquired lands under the jurisdiction of FWS. The report also examines the Payment in Lieu of Taxes (PILT) program in detail.
Date:
March 6, 1990
Creator:
Corn, M. Lynne
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Panama Rally]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Jeff Eliasoph about a small rally celebrating the Panama Invasion . This story aired at 5pm.
Date:
January 6, 1990
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Jail Visit]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story about people visiting a jail and an interview with a woman about the lack of parents of the jailed people at the meeting. This story aired at 6pm.
Date:
January 6, 1990
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Panama Rally]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, of a small rally about the Panama Invasion, celebrating the U.S. invasion in Panama. This story aired at 10pm.
Date:
January 6, 1990, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Spcl session]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Sherry Woodard about the special session date controversy as it is close to the primary election. This story aired at 10pm.
Date:
January 6, 1990
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[Press release: Post card campaign underway in U.S. Congress]
Press release promoting the NGLTF's post card campaign to Congress members to support the Federal Gay and Lesbian Civil Rights Bill.
Date:
February 6, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press release: World's only gay and lesbian Arab group seeking members]
Press release advertising the Gay and Lesbian Arab Society that is seeking members, especially in the San Francisco area.
Date:
February 6, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press release: NGLTF seeks data for annual violence report]
Press release urging activists and organizations to report harassment and violence against gay and lesbians for their annual violence report.
Date:
February 6, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 82, No. 49, Ed. 1 Thursday, December 6, 1990
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 6, 1990
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 82, No. 36, Ed. 1 Thursday, September 6, 1990
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
September 6, 1990
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The winds of Fermilab
The drought of 1988 caused the operations group to become concerned about the rate of evaporation from the Main Ring cooling ponds. They needed a way to data-log windspeed and direction. They had an old broken Heathkit weather station. The anemometer and windvane were salvaged and repaired. An interface to two MADC channels on the PBAR CAMAC link was built on an old piece of CAMAC card with salvaged parts. The project cost nothing. It has been in service since January 1989.
Date:
December 6, 1990
Creator:
Tomlin, R.
Object Type:
Report
System:
The UNT Digital Library
The All Particle Monte Carlo method: Atomic data files
Development of the All Particle Method, a project to simulate the transport of particles via the Monte Carlo method, has proceeded on two fronts: data collection and algorithm development. In this paper we report on the status of the data libraries. The data collection is nearly complete with the addition of electron, photon, and atomic data libraries to the existing neutron, gamma ray, and charged particle libraries. The contents of these libraries are summarized.
Date:
November 6, 1990
Creator:
Rathkopf, J.A.; Cullen, D.E. & Perkins, S.T.
Object Type:
Article
System:
The UNT Digital Library
An optical technique for the direct measurement of the 2-D spectral density of a passive scalar in a turbulent flow
A new optical technique for quantitatively measuring the spectral density of passive scalar fluctuations in a turbulent flow has been developed. The technique exploits the photorefractive properties of BaTiO{sub 3} to separate the optical signal of the turbulent field from the coherent illumination background. It is a major improvement over existing techniques in that it is non-intrusive, has excellent frequency response and spatial resolution, and is capable of simultaneously measuring two components of the three-dimensional spectral density, {Phi}{theta}({kappa}). The technique is thus especially well suited to the directly study of anisotropic flows. We have applied this technique to study the spectrum of temperature fluctuations in a fully developed turbulent channel flow with heat addition. The flow is highly anisotropic, yet the spectrum in directions transverse to the flow is seen to exhibit an inertial--convective subrange behavior which is characteristic of isotropic flows. The spectral behavior in the flow direction, due to the direct influence of the mean strain rate, is observed to be markedly different. 17 refs., 7 figs.
Date:
April 6, 1990
Creator:
Robey, H.F.; Albrecht, G.F. & Moore, T.R.
Object Type:
Article
System:
The UNT Digital Library
Jet energy resolution of the SDC detector
We have answered the PAC question ( Demonstrate the jet energy resolution of your proposed detector by studying decays Z {yields} jet + jet and Z{prime} {yields} jet + jet, M{sub Z{prime}} = 1 TeV.'') using a general program called SSCSIM. This program is a tool for investigating simple questions involving the relations between detector parameters and physics capabilities of a detector. A different package called ANLSIM developed by our colleagues at Argonne has also been used to answer this question. The results as expected are very similar. In this note we will try to document our procedures. Our tentative conclusion from this study is that physics induced effects, out-of-cone fluctuations and underlying event fluctuations, dominate the resolution. Pushing the detector performance to the limits of technology improves the effective resolution by at most 20%. 20 refs., 6 figs., 5 tabs.
Date:
December 6, 1990
Creator:
Para, A.; Beretvas, A.; Denisenko, K.; Denisenko, N.; Green, D.; Yeh, G.P. (Fermi National Accelerator Lab., Batavia, IL (USA)) et al.
Object Type:
Report
System:
The UNT Digital Library
Ionic two photon states and optical nonlinearity in. pi. -conjugated polymers
A microscopic mechanism of optical nonlinearity in {pi}-conjugated polymers is presented. It is shown that the bulk of the nonlinearity is determined by only two well defined channels, even though an infinite number of channels are possible in principle. The above conclusion is true for both short and long range Coulomb interactions. The complete frequency dependence of the third harmonic generation in both trans-polyacetylene and polydiacetylene are explained within the same theoretical picture. 19 refs., 4 figs.
Date:
November 6, 1990
Creator:
Dixit, S.N. (Lawrence Livermore National Lab., CA (USA)); Guo, D. & Mazumdar, S. (Arizona Univ., Tucson, AZ (USA). Dept. of Physics)
Object Type:
Article
System:
The UNT Digital Library
The entropy in supernova explosions
The explosion of a supernova forms because of the collapse to a neutron star. In addition an explosion requires that a region of relatively high entropy be in contact with the neutron star and persisting for a relatively protracted period of time. The high entropy region ensures that the maximum temperature in contact with the neutron star and in hydrostatic equilibrium is less than some maximum. This temperature must be low enough such that neutrino emission cooling is small, otherwise the equilibrium atmosphere will collapse adding a large accretion mass to the neutron star. A so-called normal explosion shock that must reverse the accretion flow corresponding to a typical stellar collapse must have sufficient strength or pressure to reverse this flow and eject the matter with 10{sup 51} ergs for a typical type II supernova. Surprisingly the matter behind such a shock wave has a relatively low entropy low enough such that neutrino cooling would be orders of magnitude faster than the expansion rate. The resulting accretion low would be inside the Bondi radius and result in free-fall accretion inside the expanding rarefaction wave. The accreted mass or reimplosion mass unless stopped by a high entropy bubble could than exceed …
Date:
December 6, 1990
Creator:
Colgate, S. A.
Object Type:
Article
System:
The UNT Digital Library
Diffusive transport enhancement by isolated resonances and distribution tails growth in hadronic beams
The escape rates and evolution of a distribution of particles are considered for a 2-D model of transverse motion of particles in hadronic storage rings, when nonlinear resonances and external diffusion are present. Dynamic enhancement of diffusion inside separatrices can develop under a certain geometry of resonance oscillations and relatively wide resonances, leading to the fast growth of distribution tails and escape rates. The phenomenon is absent in 1-D. 10 refs., 4 figs.
Date:
December 6, 1990
Creator:
Gerasimov, A.
Object Type:
Article
System:
The UNT Digital Library