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320
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9,237
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5,649
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913
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Results:
1 - 24 of
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1. 2-GeV damping-ring complex for the Stanford Linear Collider
The choice of parameters, the design, a 2-1/2 year consruction program and the early operation of a high field, high tune research and development damping ring complex for one of the two linear collider beams are described.
Date:
July 1983
Creator:
Fischer, G. E.; Davies-White, W.; Fieguth, T. & Wiedemann, H.
Object Type:
Article
System:
The UNT Digital Library
2-1/2-dimensional numerical solution for the electromagnetic scattering using a hybrid technique
The use of the electromagnetic method for geothermal reservoir exploration and delineation was studied. A number of techniques were developed to provide high quality field data. The remaining problem of interpreting these data in regions of complex geologic structure was overcome by the development of a numerical solution based on the hybrid technique, making use of both the finite element and the integral equation techniques. The major improvement is in the computing speed. (ACR)
Date:
March 1, 1983
Creator:
Lee, K. H. & Morrison, H. F.
Object Type:
Article
System:
The UNT Digital Library
3-10 keV and 0. 1- to 2-MeV observations of four gamma-ray bursts
Four catalogued ..gamma..-ray bursts that occurred between 79/3/7 and 79/7/31 have been observed over the 3 to 10 keV range by a joint NRL/Los Alamos experiment on the Air Force P78-1 satellite. The bursts were also well observed by members of the interplanetary network. In this paper we present hardness ratios, x-ray/..gamma..-ray luminosity ratios, and time histories. The most significant results presented herein can be summarized as follows: (1) gamma-ray bursters can emit fairly strongly at x-ray energies near the time of the ..gamma.. burst with L/sub x//L/sub ..gamma../ approx. .02 (L/sub x/ approx. 10/sup 37/ ergs s/sup -1/, 3 to 10 keV, assuming a distance of 1 kpc); (2) the centroid of the x-ray emission generally lags the ..gamma..-ray centroid, but there is also evidence for one or more types of x-ray precursor activity; (3) the ..gamma..-ray hardness ratios were not highly variable for these particular events. However, there is some evidence that the ..gamma..-ray spectra softened near the ends of the bursts when the x-ray/..gamma..-ray ratios were high; (4) the x-ray/..gamma..-ray power law number index during times of the strongest ..gamma..-ray emission ranged from 0.8 to approx. 1.1 for the four bursts; (5) the x-ray tail of GB790307 …
Date:
January 1, 1983
Creator:
Laros, J. G.; Evans, W. D.; Fenimore, E. E.; Klebesadel, R. W.; Shulman, S. & Fritz, G.
Object Type:
Article
System:
The UNT Digital Library
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 reduced equations.
Date:
January 1, 1983
Creator:
Carreras, B. A.; Garcia, L.; Hender, T. C.; Hicks, H. R.; Holmes, J. A.; Lynch, V. E. et al.
Object Type:
Article
System:
The UNT Digital Library
(4+2)-Cycloaddition Reactions of Ketenes; Pyranones
This study deals with the (4+2)-cycloaddition reactions of 4-Ï€ electron compounds with ketenes. Chloroketenes were generated in situ from the corresponding chlorinated acid chlorides in the presence of the ketenophiles. Chloro-, dichloro- and diphenylketenes reacted with 1-methoxy-3-trimethylsiloxy-l,3-butadiene, and 2,4-bis(trimethylsiloxy)-1,3-pentadiene to yield the corresponding dihydropyrans. The dihydropyrans yielded substituted 4-pyranones on hydrolysis.
Date:
August 1983
Creator:
Agho, Michael O. (Michael Osarenogowu)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
4 Generations of Photography
An advertisement flyer used to promote the exhibition of the "4 Generations of Photography - Photographs made between 1890 and 1980 in Texas" by all four Byrd Williams.
Date:
[1983,1985]
Creator:
unknown
Object Type:
Photograph
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. 8 GHz ophthalmic microwave applicator for treatment of choroidal melanoma
We report on the use of a 5.8 GHz microwave applicator to treat choroidal melanoma (Greene) in rabbits. The physical requirements needed to treat these intraocular tumors are quite different from those encountered elsewhere in the body. From a trans-scleral approach the penetration needed is minimal (5 to 10 mm.). The fibrous sclera is the only structure between the heat source and the tumor. The sclera has a relatively low water content when compared to tumor. This fact in addition to the frequency dependent interactions of tissue and electromagnetic radiation, results in an advantage to the use of the 5.8 GHz microwave device in treating intraocular malignancies.
Date:
June 1983
Creator:
Finger, Paul T.; Packer, Samuel; Svitra, Paul; Paglione, Robert W.; Albert, Daniel M. & Chess, Jeremy
Object Type:
Article
System:
The UNT Digital Library
9. 1-T iron-free Nb-Ti dipole magnet with pancake windings
An eight-pancake Nb-Ti dipole magnet, with bent up ends, called D-108B has been built and tested. This magnet is a Nb-Ti version of a Nb/sub 3/Sn magnet designed to produce a 10-tesla dipole field in a 40 mm diameter aperture. The pancack design is used for the heavy 12,000 ampere Nb/sub 3/Sn cable because of the mechanical difficulty in winding such a heavy cable into the conventional nested cylindrical shell configuration with a 2'' inner winding diameter. The Nb-Ti version operates at 1.8K, in He II, has superconducting cable half as thick as the Nb/sub 3/Sn cable, and operates at half the operating current: 6000 A rather than 12,000 A at 10 tesla. Both magnets are approximately one meter long. D-10B was tested from January 26 to February 2, 1983 and reached short-sample performance in both He I and He II after moderate training. The central field at 4.3K is 7.0 (+- 0.1) tesla, and at 1.8K is 9.1 (+- 0.2) tesla. Ramp rate sensitivity and cyclic heating data were also measured.
Date:
March 1, 1983
Creator:
Gilbert, W.; Caspi, S.; Hassenzahl, W.; Meuser, R.; Peters, C.; Rechen, J. et al.
Object Type:
Article
System:
The UNT Digital Library
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 this higher top energy but some remarks will be made at the end about changes needed to reach these energies. The basic elements of the facility would remain much the same.
Date:
January 1, 1983
Creator:
Young, G. R.; Martin, J. A. & Ball, J. B.
Object Type:
Article
System:
The UNT Digital Library
S-20 photocathode research activity. Part I
The goal of this activity has been to develop and implement S-20 photocathode processing techniques at Lawrence Livermore National Laboratory (LLNL) in order to study the physical properties of the photocathode films. The present work is the initial phase of a planned activity in understanding cathode fabrication techniques and the optical/electrical characterization of these films.
Date:
November 22, 1983
Creator:
Gex, F.; Huen, T. & Kalibjian, R.
Object Type:
Report
System:
The UNT Digital Library
20 TeV collider lattices with low-. beta. insertions
A lattice containing insertions designed for collisions of 20 TeV proton beams at crossing points having beta values of two meters or less is presented. The machine would use high-field double bore superconducting magnets, with opposite focusing action on the two beams passing through each quadrupole. Hence the focusing pattern in the insertions is antisymmetric about the crossings. The beams, separated by 16 cms in the arcs are made colinear by dipoles common to both beams and then focused to the low-..beta.. collision points by quadrupole triplets. A similar machine design for pp collisions is also included.
Date:
August 1, 1983
Creator:
Garren, A.A.
Object Type:
Article
System:
The UNT Digital Library
20-TeV colliding-beam facilities
In March, a workshop was held at Cornell University on the accelerator. The conclusion of this workshop was that a 20 TeV on 20 TeV proton-proton collider is technically feasable, that construction could begin after 2.5 to 4 years of research and development, and the cost would be 1.3 to 2 billion dollars. To put this machine into perspective one must consider the existing facilities listed in table I. There are about 23 high energy physics laboratories in the world that are being operated or constructed. Most of these labs have an effective energy of less than 100 GeV and study principally the known quarks and leptons. The only accelerator operating at an effective energy greater than 100 GeV is the CERN proton-antiproton system. As has been presented at this conference in other papers their success has been great in a very short time, the discovery of the vector bosons W and Z. The only machine approved that will have an effective energy greater than 1000 GeV is the Russian accelerator UNK. The effective energy of a 20 TeV on 20 TeV proton-proton collider would be about 15 TeV.
Date:
September 15, 1983
Creator:
Huson, F.R.
Object Type:
Report
System:
The UNT Digital Library
30-MJ SMES system operating experience: November 1982-June 1983
This paper describes performance measurements on the dewar, coil, and cryogenic system for the 30-MJ superconducting magnetic energy storage (SMES) unit that has recently been tested at a Bonneville Power Administration substation in Tacoma, Washington. The cryostat, the world's largest fiber-reinforced plastic, open-mouthed dewar, boils off 12 l/h in accordance with previous calculations. Cyclic losses in the coil, 54 W for +-8.4-MW modulation at 1 Hz, are approximately 50% greater than calculated. Refrigerator capacity is adequate to handle the heat produced by the average modulation demand on the coil.
Date:
January 1, 1983
Creator:
Schermer, R.I.
Object Type:
Article
System:
The UNT Digital Library
30 MJ superconducting magnetic energy storage stabilizing coil. Final report for construction
This report covers Phase II, Fabrication and Delivery of the 30 MJ Superconducting Magnetic Energy Storage Stabilizing Coil. A history of the manufacturing and assembly phase of the magnet is presented. Major problems and solutions are summarized, and illustrations of the major operations are provided. The Quality Assurance program is described with a listing of all nonconformance reports. Design documentation is provided, including a Design Document Index, monthly progress reports, and a list of papers given on the project. Appendices to the report contain copies of released and revised design calculations, test reports, assembly procedure, and nonconformance reports and engineering dispositions.
Date:
March 1, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
30-MJ Superconducting Magnetic-Energy-Storage Stabilizing System: An Overview
The 30-MJ superconducting magnetic-energy-storage (SMES) system was devised as an alternate means to modulate the Bonneville Power Administration (BPA) Pacific AC Intertie, a part of the Western US Power System, to prevent undamped power oscillations at 0.35 Hz that were observed to be associated with high power transmission. The SMES system was installed at the BPA Tacoma Substation and successfully operated as an experimental device to initiate tests to determine power system dynamics, to investigate their variability, to assess system response to SMES modulation with a major variable load, and to use SMES to develop stability-control techniques. The system has been operated at frequencies of 0.1 to 1.0 Hz at power levels of +- 8.3 MW with a parallel modulation of the converter bridges and up to 9.5 MW reactive power together with +- 4.5 MW real power in constant VAR mode with buck-boost modulation of the bridges. The coil has been charged at a maximum rate of 11.8 MW. Operation of the SMES system is now under BPA jurisdiction, and all hardware has been transferred to BPA.
Date:
January 1, 1983
Creator:
Roger, J. D.; Boenig, H. J.; Dean, J. W.; Schermer, R. I.; Annestrand, S. A.; Hauer, J. F. et al.
Object Type:
Article
System:
The UNT Digital Library
53 Per, slow, and Be star pulsations. Lecture 8
Spectral variations of the class of variable stars that seems to have no radial pulsations at all are discussed. Models of the rotation of these stars are considered. (GHT)
Date:
March 14, 1983
Creator:
Cox, A. N.
Object Type:
Article
System:
The UNT Digital Library
85,000-GPM, single-stage, single-suction LMFBR intermediate centrifugal pump
The mechanical and hydraulic design features of the 85,000-gpm, single-stage, single-suction pump test article, which is designed to circulate liquid-sodium coolant in the intermediate heat-transport system of a Large-Scale Liquid Metal Fast Breeder Reactor (LS-LMFBR), are described. The design and analytical considerations used to satisfy the pump performance and operability requirements are presented. The validation of pump hydraulic performance using a hydraulic scale-model pump is discussed, as is the featute test for the mechanical-shaft seal system.
Date:
January 1, 1983
Creator:
Fair, C.E.; Cook, M.E. Huber, K.A. & Rohde, R.
Object Type:
Article
System:
The UNT Digital Library
[100 Block of Main Street from Reidel]
Photograph of Main Street (TX-72) in Yorktown, looking east from the corner Reidel Street, where traffic lights are visible on cables at the top of the image. Connected store buildings are visible along both sides of the street and cars are parked at the curbs, and stopped at the intersection.
Date:
June 1983
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
120 Degree Phase Advance\ Cell Lattice
None
Date:
December 6, 1983
Creator:
Ruggiero, Alessandro G.
Object Type:
Report
System:
The UNT Digital Library
120-GeV proton transport for antiproton production in the Fermilab Tevatron I project
Short bunches of 120 GeV protons will be used for the production of 8 GeV antiprotons. Protons will be extracted vertically from the Main Ring using two high field Lambertson type magnets at location F17. The beam transport is made of three sections: horozintol dispersion cancellation, vertical dispersion cancellation and final focusing. The final focusing section is composed of two quadrupole doublets and allows for variation in ..beta..* values at the target from 1.5 m to 20.0 m.
Date:
March 1, 1983
Creator:
Colton, E.; Hojvat, C. & Oleksiuk, L.
Object Type:
Article
System:
The UNT Digital Library
150-kW, 450-MHz gyrocon rf generator
The output-power and conversion efficiency of the Los Alamos gyrocon were increased by a factor of 150 in the past year. Major improvements in the phase- and amplitude-control system and in understanding the electron multipactor and surface-conditioning processes increased the output power. The highest measured efficiency on this gyrocon is 23%, which was obtained with several combinations of parameters. Both the output power and the efficiency are a factor of 3 below the design values, and several possibilities are being examined to remove the discrepancy between theory and experiment.
Date:
January 1, 1983
Creator:
Tallerico, P.J.
Object Type:
Article
System:
The UNT Digital Library
185-MeV injector design for the ANL 4-GeV microtron project
The injector starts with a 5 MeV preinjector followed by an 18 MeV S-band linac. The 23 MeV electrons are transported and injected into a Racetrack Microtron via a 10/sup 0/ achromatic bend system. Twenty-seven turns are used to boost the energy to 185 MeV. Reverse-field stripes on the 180/sup 0/ end magnets and quadrupole focussing on the return paths maintain a matched-dispersion free beam with transverse ..beta..= 5.0 m in the center of the 4.6 m long linac. The beam is recirculated outside of the RTM linac to shear the longitudinal phase-space ellipse before extraction. The extracted beam is transported and injected into the six-sided microtron at 185 MeV.
Date:
January 1, 1983
Creator:
Colton, E.
Object Type:
Article
System:
The UNT Digital Library
200 Sand Steamflood Demonstration Project. Sixth annual report, June 1981-June 1982
This demonstration project was initiated in the 200 Sand Pool in the Midway-Sunset Field, California Sand Pool to demonstrate the operational, recovery, and economic aspects of steamflooding a typical heavy oil reservoir which had unfavorable response to cyclic stimulation. The scope of the project involves 5 phases: (1) pilot site monitoring and evaluation; (2) pilot area expansion; (3) site selection for expansion to full-scale project; (4) expansion to full-scale steamflood; and (5) production monitoring. After expansion and steam injection for one year, the wells are averaging 8 B/D oil and 29 B/D water per well. This rate is above the 5 BOPD for cyclic stimulation. Most of the producing wells are steam stimulated about twice a year to enhance steam breakthrough from the continuous steam. The total area has averaged 319 B/D oil and 1233 B/D water the last year. 7 figures, 1 table.
Date:
August 1, 1983
Creator:
Alford, W.O.
Object Type:
Report
System:
The UNT Digital Library