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35
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10
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9
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388 Matching Results
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Alpha Particle Physics Experiments in the Tokamak Fusion Test Reactor
Alpha particle physics experiments were done on the Tokamak Fusion Test Reactor (TFTR) during its deuterium-tritium (DT) run from 1993-1997. These experiments utilized several new alpha particle diagnostics and hundreds of DT discharges to characterize the alpha particle confinement and wave-particle interactions. In general, the results from the alpha particle diagnostics agreed with the classical single-particle confinement model in magnetohydrodynamic (MHD) quiescent discharges. Also, the observed alpha particle interactions with sawteeth, toroidal Alfvén eigenmodes (TAE), and ion cyclotron resonant frequency (ICRF) waves were roughly consistent with theoretical modeling. This paper reviews what was learned and identifies what remains to be understood.
Date:
December 14, 1998
Creator:
Budny, R. V.; Darrow, D. S.; Medley, S. S.; Nazikian, R. & Zweben, S. J.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 235, Ed. 1 Monday, December 14, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 108, No. 38, Ed. 1 Monday, December 14, 1998
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Schwind, Jim & Looby, Edward
Object Type:
Newspaper
System:
The Portal to Texas History
Ash & Pulverized Coal Deposition in Combustors & Gasifiers
Gravity- driven granular flow of slightly frictional particles down an inclined, bumpy chute is studied. A modified kinetic model which includes the frictional energy loss effects is used, and the boundary conditions for a bumpy wall with small friction are derived by ensuring the balance of momentum and energy. At the free surface, the condition of vanishing of the solid volume fraction is used. The mean velocity, the fluctuation kinetic energy and the solid volume fraction profiles are evaluated. It is shown that steady granular gravity flow down a bumpy frictional chute could be achieved at arbitrary inclination angles. The computational results also show that the slip velocity may vary considerably depending on the granular layer height, the surface boundary roughness, the fric-tion coefficient and the inclination angles. The model predictions are compared with the existing experimental and simulation data, and good agreement is observed. In particular, the model can well predicate the features of the variation of solid volume fraction and fluctuation energy profiles for different particle- wall friction coeffi-cients and wall roughnesses.
Date:
December 14, 1998
Creator:
Ahamadi, Goodarz
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 38, Ed. 1 Monday, December 14, 1998
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
[Card from Sam Blain, Jr., to Bill and Mary Cheek]
Card sent to Bill and Mary Cheek by Sam Blain, Jr., introducing a copy of the Musée Rodin catalog that belonged to artist Olin Herman Travis.
Date:
December 14, 1998
Creator:
Blain, Sam, Jr.
Object Type:
Text
System:
The Portal to Texas History
Characterization of Sputter Deposited Thin Film Scandate Cathodes for Miniaturized Thermionic Converter Applications
We have successfully developed a method for fabricating scandate-based thermionic emitters in thin film form. The primary goal of our effort is to develop thin film emitters that exhibit low work fimction, high intrinsic electron emissivity, minimum thermal activation properties and that can be readily incorporated into a microgap converter. Our approach has been to incorporate BaSrO into a SqOq matrix using rf sputtering to produce thin films. Diode testing has shown the resulting films to be electron emissive at temperatures as low as 900 K with current densities of 0.1 mA.cm-2 at 1100 K and saturation voltages. We calculate an approximate maximum work function of 1.8 eV and an apparent emission constant (Richardson's constant, A*) of 36 mA.cm-2.K-2. Film compositional and structural analysis shows that a significant surface and subsurface alkaline earth hydroxide phase can form and probably explains the limited utilization and stability of Ba and its surface complexes. The flexibility inherent in sputter deposition suggests alternate strategies for eliminating undesirable phases and optimizing thin film emitter properties.
Date:
December 14, 1998
Creator:
King, D.B.; Ruffner, J.H. & Zavadil, K.R.
Object Type:
Article
System:
The UNT Digital Library
Corrosion testing of stainless steel-zirconium metal waste form.
Stainless steel-zirconium (SS-Zr) alloys are being considered as waste forms for the disposition of metallic waste generated during the electrometallurgical treatment of spent nuclear fuel. The waste forms contain irradiated cladding hulls, components of the alloy fuel, noble metal fission products, and actinide elements. The baseline waste form is a stainless steel-15 wt% zirconium (SS-15Zr) alloy. This article presents microstructure and some of the corrosion studies being conducted on the waste form alloys. Electrochemical corrosion, immersion corrosion, and vapor hydration tests have been performed on various alloy compositions to evaluate corrosion behavior and resistance to selective leaching of simulated fission products. The SS-Zr waste forms are successful at the immobilization and retention of fission products and show potential for acceptance as high-level nuclear waste forms.
Date:
December 14, 1998
Creator:
Abraham, D. P.
Object Type:
Article
System:
The UNT Digital Library
DOD Animal Research: Improvements Needed in Quality of Biomedical Research Database
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO examined several issues related to the Department of Defense's (DOD) administration of its animal research programs, focusing on: (1) the extent to which DOD's research using animals addresses validated military objectives, does not unnecessarily duplicate work done elsewhere, and incorporates methods to reduce, replace, and refine the use of animals; and (2) problems with the accuracy of information in the Biomedical Research Database (BRD)."
Date:
December 14, 1998
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, December 14, 1998
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Food Stamp Program: Information on Employment and Training Activities
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on: (1) the number of able-bodied adults without dependents who are receiving food stamp benefits, the number who are required to meet the work requirements, and the number who are exempted from the requirements; (2) the number of able-bodied adults without dependents participating in qualifying employment and training or Workfare programs; and (3) the amounts of federal grant funds that states spent through the first three quarters of fiscal year 1998 for employment and training or workfare programs for food stamp recipients."
Date:
December 14, 1998
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
IRS Systems Security: Although Significant Improvements Made, Tax Processing Operations and Data Still at Serious Risk
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Internal Revenue Service's (IRS) progress in correcting serious computer security weaknesses at five IRS facilities, focusing on: (1) additional security weaknesses identified at the five facilities and at an IRS facility not included in GAO's previous report; and (2) steps IRS has taken or plans to take to implement a service-wide computer security management program."
Date:
December 14, 1998
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Model Etch Profiles for Ion Energy Distribution Functions in an Inductively Coupled Plasma Reactor
Rectangular trench profiles are modeled with analytic etch rates determined from measured ion distribution functions. The pattern transfer step for this plasma etch is for trilayer lithography. Argon and chlorine angular ion energy distribution functions measured by a spherical collector ring analyzer are fit to a sum of drifting Maxwellian velocity distribution functions with anisotropic temperatures. The fit of the model ion distribution functions by a simulated annealing optimization procedure converges adequately for only two drifting Maxwellians. The etch rates are proportional to analytic expressions for the ion energy flux. Numerical computation of the etch profiles by integration of the characteristic equations for profile points and connection of the profiles points is efficient.
Date:
December 14, 1998
Creator:
Abraham-Shrauner, B.; Chen, W. & Woodworth, J.R.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Strauss O]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 14, 1998, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Nonlinear vibrational spectroscopy of surfactants at liquid interfaces
None
Date:
December 14, 1998
Creator:
Miranda, P.B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Nuclear Data Project Evaluation Activity Report
This report summarizes the activities of the ORNL Nuclear Data Project since the IAEA Advisory Group meeting in October 1996. The group's future plans are also included.
Date:
December 14, 1998
Creator:
Akovali, Y. A.; Artna-Cohen, A.; Blackmon, J. C.; Radford, D.; Smith, M. S. & Yu, C. H.
Object Type:
Article
System:
The UNT Digital Library
Optical and Electronic Properties of Si Nanoclusters Synthesized in Inverse Micelles
Highly crystalline, size-selected silicon (Si) nanocrystals in the size range 2-10 nm were grown in inverse micelles and their optical absorption and photoluminescence (PL) properties were studied. High resolution TEM and electron diffraction results show that these nanocrystals retain their cubic diamond stuctures down to sizes {approximately}4 nm in diameter, and optical absorption data suggest that this structure and bulk-like properties are retained down to the smallest sizes produced ({approximately}1.8 nm diameter containing about 150 Si atoms). High pressure liquid chromatography techniques with on-line optical and electrical diagnostics were developed to purify and separate the clusters into pure, monodisperse populations. The optical absorption revealed features associated with both the indirect and direct bandgap transitions, and these transitions exhibited different quantum confinement effects. The indirect bandgap shifts from 1.1 eV in the bulk to {approximately}2.1 eV for nanocrystals {approximately}2 nm in diameter and the direct transition at r(l_"X - r15) blue shifts by 0.4 eV from its 3.4 eV bulk value over the same size range. Tailorable, visible, room temperature PL in the range 700-350 nm (1.8 - 3.5 eV) was observed from these nanocrystals. The most intense PL was in the violet region of the spectrum ({approximately}400 nm) and is …
Date:
December 14, 1998
Creator:
Provencio, P. N.; Samara, G. A. & Wilcoxon, J. P.
Object Type:
Article
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 105, No. 243, Ed. 1 Monday, December 14, 1998
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
A Planar Quantum Transistor Based on 2D-2D Tunneling in Double Quantum Well Heterostructures
We report on our work on the double electron layer tunneling transistor (DELTT), based on the gate-control of two-dimensional -- two-dimensional (2D-2D) tunneling in a double quantum well heterostructure. While previous quantum transistors have typically required tiny laterally-defined features, by contrast the DELTT is entirely planar and can be reliably fabricated in large numbers. We use a novel epoxy-bond-and-stop-etch (EBASE) flip-chip process, whereby submicron gating on opposite sides of semiconductor epitaxial layers as thin as 0.24 microns can be achieved. Because both electron layers in the DELTT are 2D, the resonant tunneling features are unusually sharp, and can be easily modulated with one or more surface gates. We demonstrate DELTTs with peak-to-valley ratios in the source-drain I-V curve of order 20:1 below 1 K. Both the height and position of the resonant current peak can be controlled by gate voltage over a wide range. DELTTs with larger subband energy offsets ({approximately} 21 meV) exhibit characteristics that are nearly as good at 77 K, in good agreement with our theoretical calculations. Using these devices, we also demonstrate bistable memories operating at 77 K. Finally, we briefly discuss the prospects for room temperature operation, increases in gain, and high-speed.
Date:
December 14, 1998
Creator:
Baca, W. E.; Blount, M. A.; Hafich, M. J.; Lyo, S. K.; Moon, J. S.; Reno, J. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Results of a live trapping survey for the Alameda whipsnake (masticophis lateralis euryxanthus) at the Site 300 facilities of Lawrence Livermore National Laboratory
None
Date:
December 14, 1998
Creator:
Woollett, J. S.
Object Type:
Report
System:
The UNT Digital Library
Russian Missile Technology and Nuclear Reactor Transfers to Iran
Many in Congress and the Clinton Administration charge that Russian entities are assisting Iran in developing ballistic missiles. Russia is also building a nuclear power station and is finishing other nuclear services to, Iran. Congress has passed legislation requiring the President to impose sanctions for missile technology transfers, arms sales, nuclear technology transfers, and large-scale investments in Iran. H.R 2709, which includes the "Iran Missile Proliferation Sanctions Act of 1997," is one of several bills designed to tighten existing sanctions law. It was amended and passed by the Senate on May 22, 1998, and by the House on June 9 by very large bipartisan majorities. Nevertheless, President Clinton vetoed the bill on June 23 and said he would work to sustain the veto.
Date:
December 14, 1998
Creator:
Goldman, Stuart D.; Katzman, Kenneth; Shuey, Robert & Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Russian Missile Technology and Nuclear Reactor Transfers to Iran
This report discusses the U.S. response to the Russian Government potentially violating the Missile Technology Control Regime. The report details the accusations made against Russia, and the progression of Iran's nuclear power program. It also highlights the connection these allegations have with respect to U.S. policy and the sanctions that were introduced by the U.S. Congress as a result.
Date:
December 14, 1998
Creator:
Goldman, Stuart D.; Katzman, Kenneth; Shuey, Robert D. & Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 78, Ed. 1 Monday, December 14, 1998
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 1998
Creator:
Horn, Richard A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
SPHINX Measurements of Radiation Induced Conductivity of Foam
Experiments on the SPHINX accelerator studying radiation-induced conductivity (RIC) in foam indicate that a field-exclusion boundary layer model better describes foam than a Maxwell-Garnett model that treats the conducting gas bubbles in the foam as modifying the dielectric constant. In both cases, wall attachment effects could be important but were neglected.
Date:
December 14, 1998
Creator:
Ballard, W.P.; Beutler, D.E.; Burt, M.; Dudley, K.J. & Stringer, T.A.
Object Type:
Article
System:
The UNT Digital Library