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A 0. 4 mm Interferometer System Using Dielectric Waveguide

A 0.4 mm submillimeter-wave, phase-modulated polarimeter/interferometer is used for simultaneous time-dependent measurement of line-averaged electron density and poloidal field-induced Faraday rotation along chords of the plasma column in ISX-B tokamak. Heterodyna detection and hollow dielectric waveguide are utilized to achieve the high sensitivity required for the multichord equipment.

Date: January 1, 1982

Creator: Hutchinson, D. P.; Ma, C. H.; Staats, P. A. & Vander Sluis, K. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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1. Summary of Runs, s56, 57, 73, 74, 78, 79, 80, 87, 88, 89 in Which Slurries Circulated at 300 C in 100-a Loops Caked or Accumulated on Pipe Walls. 2. Summary of Runs T-52 Through T-75 in Which a Bypass Line Was Used in Parallel With Main Circulating Loop

No Description Available.

Date: November 16, 1956

Creator: Kitzes, A. S.; Gallaher, R. B.; McLaughlin, C. A. & Wichner, R. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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2-D image segmentation using minimum spanning trees

This paper presents a new algorithm for partitioning a gray-level image into connected homogeneous regions. The novelty of this algorithm lies in the fact that by constructing a minimum spanning tree representation of a gray-level image, it reduces a region partitioning problem to a minimum spanning tree partitioning problem, and hence reduces the computational complexity of the region partitioning problem. The tree-partitioning algorithm, in essence, partitions a minimum spanning tree into sub… more

Date: September 1995

Creator: Xu, Y. & Uberbacher, E. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3. 6 simplified methods for design

Simplified design analysis methods for elevated temperature construction are classified and reviewed. Because the major impetus for developing elevated temperature design methodology during the past ten years has been the LMFBR program, considerable emphasis is placed upon results from this source. The operating characteristics of the LMFBR are such that cycles of severe transient thermal stresses can be interspersed with normal elevated temperature operational periods of significant duration, … more

Date: January 1, 1981

Creator: Nickell, R.E. & Yahr, G.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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3-D Analysis on Arbitrarily-Shaped Icrf Antennas and Faraday Shields

Cavity antennas with Faraday shields are proposed to couple ion cyclotron radio frequency power for heating fusion plasmas. This application requires small, high-power, low-frequency antennas. The results are presented of a theoretical study of the ICRF antennas being developed for this purpose at the Radio Frequency Test Facility (RFTF). The objectives of this work are to optimize experimental designs and to confirm test results. (MOW)

Date: January 1, 1986

Creator: Chen, G. L.; Whealton, J. H.; Baity, F. W.; Hoffman, D. J. & Owens, T. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

3-D Measurement of Deformation Microstructure of Al(0.2%)Mg Using Submicron Resolution White X-Ray Microbeams

We have used submicron-resolution white x-ray microbeams on the MHATT-CAT beamline 7-ID at the Advanced Photon Source to develop techniques for three-dimensional investigation of the deformation microstructure in a 20% plane strain compressed Al(0.2%)Mg tri-crystal. Kirkpatrick-Baez mirrors were used to focus white radiation from an undulator to a 0.7 x 0.7 {micro}m{sup 2} beam that was scanned over bi- and tri-crystal regions near the triple-junction of the tri-crystal. Depth resolution along … more

Date: November 29, 1999

Creator: Larson, B. C.; tamura, N.; Chung, J.-S.; Ice, G. E.; Budai, J. D.; Tischler, J. Z. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

3-D Nonlinear Calculations of Resistive Tearing Modes

Recent numerical calculations of the evolution of resistive tearing modes have been central to the understanding of magnetohydrodynamic activity and disruptions in tokamaks. The nonlinear, 3-D, initial-value computer code RSF has provided many of these results. This code assumes cylindrical geometry with a Fourier series representation in the two periodic coordinates and a finite-difference representation in the radial direction. This choice makes RSF considerably more accurate and efficient th… more

Date: March 1, 1981

Creator: Hicks, H. R.; Holmes, J. A.; Lee, D. K.; Carreras, B. & Waddell, B. V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3-D nonlinear evolution of MHD instabilities

The nonlinear evolution of ideal MHD internal instabilities is investigated in straight cylindrical geometry by means of a 3-D initial-value computer code. These instabilities are characterized by pairs of velocity vortex cells rolling off each other and helically twisted down the plasma column. The cells persist until the poloidal velocity saturates at a few tenths of the Alfven velocity. The nonlinear phase is characterized by convection around these essentially fixed vortex cells. For exampl… more

Date: March 1, 1977

Creator: Bateman, G.; Hicks, H. R. & Wooten, J. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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3-D resistive MHD calculations for tokamak plasmas: beyond the simple reduced set of equations

Numerical studies of the resistive stability of tokamak plasmas in cylindrical geometry have been performed using: (1) the full set of resistive Magnetohydrodynamic (MHD) equations and (2) an extended version of the reduced set of resistive MHD equations including diamagnetic and electron temperature effects. In particular, the nonlinear interaction of tearing modes of many helicities has been investigated. The numerical results confirm many of the features uncovered previously using the simple… more

Date: January 1, 1983

Creator: Carreras, B. A.; Garcia, L.; Hender, T. C.; Hicks, H. R.; Holmes, J. A.; Lynch, V. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

3-D subsurface modeling within the framework of an environmental restoration information system: Prototype results using earthvision

As a result of the DOE Oak Ridge Reservation (DOE-ORR) placement on the EPA Superfund National Priorities List in December of 1989, all remedial activities, including characterization, remedial alternatives selection, and implementation of remedial measures, must meet the combined requirements of RCRA, CERCLA, and NEPA. The Environmental Restoration Program, therefore, was established with the mission of eliminating or reducing to prescribed safe levels the risks to the environment or to human … more

Date: December 31, 1994

Creator: Goeltz, R. T. & Zondlo, T. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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4 MW Fast Wave Current Drive Upgrade for DIII-D

The DIII-D program has just completed a major addition to its ion cyclotron range of frequency (ICRF) systems. This upgrade project added two new fast wave current drive (FWCD) systems, with each system consisting of a 2 MW, 30 to 120 MHz transmitter, ceramic insulated transmission lines and tuner elements, and water-cooled four-strap antenna. With this addition of 4 MW of FWCD power to the original 2 MW, 30 to 60 MHz capability, experiments can be performed that will explore advanced tokamak p… more

Date: September 1, 1994

Creator: Callis, R. W.; Cary, W. P. & Baity, F. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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4 MW upgrade to DIII-D FWCD system: System commissioning and initial operation

The initial installation of the 4 MW fast wave current drive (FWCD) upgrade started in 1992 with the purchase of two ABB/Thomcast AG rf power amplifiers. These amplifiers cover the frequency range 30 MHz to 120 MHz. A maximum output power of over 2 MW between 30 MHz and 80 MHz and 1 MW at 120 MHz were the specification requirements. The system as installed is comprised of the two mentioned rf amplifiers, coaxial transmission and matching components, rf phase and amplitude monitoring, and a SUN … more

Date: October 1995

Creator: Cary, W. P.; Callis, R. W.; de Grassie, J. S.; Harris, T. E.; O`Neill, R. C.; Pinsker, R. I. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

5-Volt and 4.6 V plateaus in LiMn₂O₄ thin films

Additional plateaus with median voltages of {similar_to}4.6 V, and {similar_to}5 V have been observed on charging thin film lithium batteries with crystalline LiMn{sub 2}O{sub 4} cathodes to 5.3 V. Total charge extracted from the 4 V and the two additional plateaus corresponded to about 1Li/Mn{sub 2}O{sub 4}, but the distribution of capacity among the three plateaus varied from film to film. It is speculated that the additional plateaus result from formation of mixed spinel structures in which … more

Date: January 1, 1996

Creator: Bates, J. B.; Lubben, D.; Dudney, N. J.; Zuhr, R. A. & Hart, F. X.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

6-Acetyldihydrohomopterin and sepiapterin affect some GTP cyclohydrolase I's and not others

The first enzyme in pteridine biosynthesis, GTP cyclohydrolase I, is a likely site for regulation of pteridine biosynthesis to occur. GTP cyclohydrolase I responds to hormonal treatment and is found altered in a variety of mice with genetically based neurological and immunological disorders. Genetic loci can greatly modify the activity of GTP cyclohydrolase: Punch mutant in Drosophila hph-1 in mouse and atypical phenylketonuria in human. This report examines the ability of Ahp and sepiapterin t… more

Date: 1988~

Creator: Jacobson, K. Bruce & Manos, Richard E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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10-GeV heavy-ion collider

This paper presents a brief report on a study for a relativistic heavy-ion collider covering an energy span from 1 GeV on 1 GeV to 10 GeV on 10 GeV. This energy range was selected as most appropriate for exploitation of the baryon-rich region of relativistic nucleus-nucleus collisions. The study was done prior to the Wells College meeting of the NSAC Long-Range Plan Working Group which recommended a collider with tip energy of 30 GeV on 30 GeV. The present work has not been modified to reflect … more

Date: January 1, 1983

Creator: Young, G. R.; Martin, J. A. & Ball, J. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

14'' x 17'' film recorder for computer-enhanced scans

Physician acceptance of computer-enhanced radionuclide scan results, presented in the form of small Polaroid pictures, has been very limited for a number of subjective reasons. A new recorder was designed and constructed that presents the results of computer augmented scans through a medium that is quite familiar to doctors, the standard 14 in. x 17 in. x-ray film. (auth)

Date: January 1, 1976

Creator: Morris, A. C., Jr.; Barclay, T. R.; Akin, T. E.; Hansard, M. C.; Gibbs, W. D. & Modzelewski, C. U.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

15 cm duoPIGatron ion source

The 10-cm (grid diameter) duoPIGatron ion source produces pulsed hydrogen ion beams of 10 to 15 A beam current in the 20- to 40-keV energy range for a duration of a few tenths of a second. To fulfill the requirements of the next generation of high-power neutral beam injectors for heating plasmas in CTR devices, this source has been enlarged to a version 15-cm in grid diameter. In addition, by utilizing a magnetic multipole line cusp field confinement method, the plasma created is characterized … more

Date: October 1, 1976

Creator: Stirling, W. L.; Tsai, C. C. & Ryan, P. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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15 MeV neutron damage in Cu and Nb

An investigation was made of high-energy neutron damage in Cu and Nb irradiated with approximately 15 MeV neutrons at the Oak Ridge Isochronous Cyclotron. The neutrons were generated by bombarding a thick Be target with 40- MeV deuterons resulting in a high energy neutron spectrum broadly peaked at 15 MeV. Single crystals of Cu and Nb were irradiated at room temperature to fluences of approximately 2 x 10$sup 17$ n/cm$sup 2$. The resulting loop-type defect clusters in the crystals were characte… more

Date: January 1, 1975

Creator: Roberto, J. B.; Narayan, J. & Saltmarsh, M. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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16,000-rpm Interior Permanent Magnet Reluctance Machine with Brushless Field Excitation

The reluctance interior permanent magnet (RIPM) motor is currently used by many leading auto manufacturers for hybrid vehicles. The power density for this type of motor is high compared with that of induction motors and switched reluctance motors. The primary drawback of the RIPM motor is the permanent magnet (PM) because during high-speed operation, the fixed PM produces a huge back electromotive force (emf) that must be reduced before the current will pass through the stator windings. This re… more

Date: October 31, 2007

Creator: Hsu, J. S.; Burress, T. A.; Lee, S. T.; Wiles, R. H.; Coomer, C. L.; McKeever, J.W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

16,000-RPM Interior Permanent Magnet Reluctance Machine with Brushless Field Excitation

Introduction to Brushless field excitation(BFE) to overcome the drawbacks of Reluctance Interior Permanent Magnet (RIPM).

Date: October 1, 2007

Creator: Hsu, John S.; Burress, Timothy A.; Lee, Seong T.; Wiles, Randy H.; Coomer, Chester; McKeever, John W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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25 MV tandem accelerator at Oak Ridge

A new heavy-ion accelerator facility is under construction at the Oak Ridge National Laboratory. A brief description of the scope and status of this project is presented with emphasis on the first operational experience with the 25 MV tandem accelerator.

Date: January 1, 1980

Creator: Jones, C. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department