Partner
UNT Libraries Government Documents Department
2,119
Oklahoma Historical Society
862
UNT Libraries Special Collections
223
Dublin Public Library
34
Hoston History Research Center at Houston Public Library
34
Sterling Municipal Library
27
Brownwood Public Library
26
Texas Historical Commission
22
South Plains College
20
UNT Libraries
17
103 More
Collection
Office of Scientific & Technical Information Technical Reports
2,056
Oklahoma Publishing Company Photography Collection
631
Texas Digital Newspaper Program
455
Tocker Foundation Grant
250
Oklahoma Digital Newspaper Program
244
KXAS-NBC 5 News Collection
206
The Oklahoma City Times
42
Texas Cultures Online
40
John J. Herrera Papers
34
Chickasha Newspaper Collection
30
154 More
States
Year
Month
Results:
1 - 24 of
3,783
next
/sup 16/O + /sup 40/Ca inelastic scattering and the elastic scattering wave function
The /sup 16/O + /sup 40/Ca inelastic scattering has been measured at 60-MeV incident energy, and evidence has been found in support of an explicit coupling between direct and elastic channels. The measurements were extended over a large angular range and in particular to very forward angles. The ratio of cross sections between extreme forward and backward angles proved very useful in studying the underlying reaction mechanism.
Date:
January 1, 1977
Creator:
Rehm, K.E.; Henning, W.; Erskine, J.R. & Kovar, D.G.
Object Type:
Article
System:
The UNT Digital Library
Cryogenic supplies for the TFTR neutral beam line cryopanels
Cryocondensing panels will be used for the Neutral Beam Lines of the TFTR to satisfy a pumping speed requirement of 2.5 x 10/sup 6/ l/s. The cryocondensing panels are fed by liquid helium (LHe), boiling at selectable temperatures of 4.5/sup 0/K or 3.8/sup 0/K. Liquid nitrogen (LN/sub 2/) panels and chevrons thermally shield the LHe panel. The closed-loop LHe supply system and the open loop LN/sub 2/ system are discussed. The helium refrigerator of minimum 1070-W capacity, together with its distribution system, and the nitrogen distribution system in the ton/hour LN/sub 2/ range is presented. Problems and their solutions in connection with the LHe system, including the distribution over a distance of 500 feet of large quantities of liquid/gas mixtures with load variations over the range of about 3 : 1, and the economies of various types of distribution lines (passive, pumped, shielded, combined), are described. The system design passed the preliminary phase. Design features and auxiliary equipment to assure dispersion of large quantities of nitrogen into the atmosphere and to permit operation under degraded cryogenic helium refrigerator performance are also discussed in Design Considerations.
Date:
January 1, 1977
Creator:
Pinter, G.
Object Type:
Article
System:
The UNT Digital Library
First order study for an iron core OH system for TNS
A simple comparison has been made between an air core and an iron core ohmic heating system for a particular device, and it was shown that the peak power requirements can be substantially reduced by the use of an iron core to power levels handled by industry today. It was also shown that for an ohmic heating system initiated plasma that the cost of the iron core ohmic heating power system (iron core, dual rectifier, and DC switch) is less than the cost for a subset of the power system for an air core system (dual rectifier and DC switch). There is considerable work being done on other methods of initiating the plasma none of which seem to be incompatible with the use of an iron core system.
Date:
January 1, 1977
Creator:
Ballou, J. K. & Schultz, J.
Object Type:
Article
System:
The UNT Digital Library
Experimental program to validate analyses of accelerator breeder concepts
The concept of using high-energy particle accelerators to produce neutrons for converting fertile material to fissile is over 25 years old. It is only relatively recently that accelerator design has progressed to a point where the operation approaches commercial viability. Critical unknowns in the concept were identified in a detailed study of specic configurations. Experiments to elucidate these unknowns in a timely manner using existing material and facilities are defined and identified. Basic measurements are described to evaluate effects of the primary particle beam and resulting secondary particles in massive assemblies of most materials of interest.
Date:
January 1, 1977
Creator:
Talbert Jr., W. L.; Russell, G. J. & Malenfant, R. E.
Object Type:
Article
System:
The UNT Digital Library
Measurement of energy loss in the region of relativistic rise for particle identification
The following boundary conditions are desirable for particle detectors providing momentum and mass measurement in a magnetic field. A multilayer drift chamber of the socalled ''bicycle'' type with a radius of 1.5 m is considered. The useful track length will be l/sub min/ = 1.3 m for a straight track at 90/sup 0/ to the beam axis. Two examples for possible subdivisions of this volume are chosen: (1) number of layers, n = 200 and thickness/layer, x = 6.5 mm; and (2) n = 56 and x = 23 mm. An analysis is given in which the counting gas, the pressure, and the maximum allowable particle rate are considered as variables.
Date:
January 1, 1977
Creator:
Fischer, J.; Okuno, H. & Walenta, A.H.
Object Type:
Article
System:
The UNT Digital Library
Conceptual design of a superconducting magnet coil for the large coil program. [Flat-wound NbTi coils]
A conceptual design for a toroidal field (TF) coil for a six coil test array has been developed. The electromagnetic, cryogenic, structural, manufacturing, quality assurance and verification testing requirements have been analyzed. The bore is oval shaped and is 2.35 meters horizontally and 3.35 meters vertically. The coil is designed to operate at 8T peak field at rated current of 10450 amperes when the other 5 coils in the toroidal array are at 80% rated current. Using-flat-wound NbTi conductor this pool-boiling, pancake wound coil is fully cryostable, and is enclosed in a 316LN stainless steel coil structure and helium container capable of supporting all expected in-plane loads and out-of-plane loads due to pulsed fields and unsymmetrical current distributions in the other 5 coils.
Date:
January 1, 1977
Creator:
Quay, R.; Bryant, R. W.; Koenig, R. F.; Ferrante, J. J.; Linkinhoker, C. L.; Donato, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Simulation of chlorinated water discharges from power plants on estuaries and rivers
The fast-transient (tidal-transient) one-dimensional discrete-element chemical transport model and its associated computer code CHMONE were applied to study the effects of chlorinated water discharges from power plants on tidal estuaries and controlled rivers. The mathematical model has the capability to predict simultaneously the hydrodynamic, thermal, and chemical composition of water as one-dimensional time-dependent distributions. (LTW)
Date:
January 1, 1977
Creator:
Eraslan, A. H.; Lietzke, M. H.; Fischer, S. K. & Kalmaz, E. V.
Object Type:
Article
System:
The UNT Digital Library
Acoustic measurements of the boiling stability tests on THORS sodium loop. [LMFBR]
Acoustic data of boiling stability tests on the THORS (Thermal-Hydraulic Out-of-Reactor Safety) facility were obtained using three sodium-immersible high temperature microphones. The data was analyzed in both the time and frequency domains and provides the following information: (1) the acoustic signal due to sodium boiling was clearly observed; (2) the signal level and the repetition rate of boiling pulses are directly proportional to the applied heat flux; (3) a typical boiling pulse consists of a high frequency signal due mainly to the bubble collapses and a low frequency void oscillation; (4) the frequency spectra of the boiling and background pulses can be mostly assigned to various acoustic resonance frequencies of the THORS loop.
Date:
January 1, 1977
Creator:
Sheen, S.H.; Bobis, J.P. & Carey, W.M.
Object Type:
Article
System:
The UNT Digital Library
Estimate of the longitudinal self electric field of an ion beam
The self electric field on the axis of an ion beam of radius a in a conducting cylinder of radius b is given. The formula assumes that the radius of the conducting cylinder is much smaller than the length of the ion beam (b much less than L) and that E/sub z/ is calculated away from the edge of the beam (vertical bar z vertical bar less than vertical bar L/2 vertical bar). For the HIDE parameters, i.e., loosely speaking a 50 TW, 100 JK, multi-GeV heavy ion beam, the assumption b much less than L is no longer valid and hence this equation cannot be used. Since for an unneutralized heavy ion beam it is necessary to apply ramp voltages to compensate for the longitudinal self fields it is desirable to know exactly what these fields are. Here, exact expressions for E/sub z/ on the axis of the ion beam are obtained and are compared under different circumstances with the approximate results given by the equation.
Date:
January 1, 1977
Creator:
Irani, A.A.
Object Type:
Article
System:
The UNT Digital Library
Cruise Report: R/V KNORR 54 Leg 6, Ostend to Reykjavik, May--June 1976
Samples of seawater and sediments collected from various locations of the Atlantic Ocean and North Sea were analyzed for phosphates and silicates. Results are discussed.
Date:
January 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Avalanche transistor pulser for fast-gated operation of micro-channel plate image-intensifiers
Transistors operated in the avalanche mode are employed to generate a 1000 volt 10 to 30 nsec wide pulse with less than 4 nsec rise and fall times. This pulse is resistively attenuated to approximately equal to 270 volts and drives the image intensifier tube which is a load of approximately equal to 200 pf. To reduce stray inductance and capacitance, transistor chips were assembled on a thick-film hybrid substrate. Circuit parameters, operating conditions, and coupling to the microchannel plate image-intensifier (MCPI/sup 2/) tube are described. To provide dc operating voltages and control of transient voltages on the MCPI/sup 2/ tube a resistance-capacitance network has been developed which (a) places the MCPI/sup 2/ output phosphor at ground, (b) provides programmable gains in ''f-stop'' steps, and (c) minimizes voltage transients on the MCPI/sup 2/ tube.
Date:
January 1, 1977
Creator:
Lundy, A.; Parker, J. R.; Lunsford, J. S. & Martin, A. D.
Object Type:
Article
System:
The UNT Digital Library
HIDE working groups. A. Synchrotron based system
A summary is given of a week's discussions on an ion source to target scenario for a synchrotron for heavy ion fusion. Topics considered include: the number of beams on the target; beam dynamics; and a number of areas explicitly identified as needing further work. (PMA)
Date:
January 1, 1977
Creator:
Barton, M. Q.
Object Type:
Article
System:
The UNT Digital Library
Vapor phase spectroscopy of complex lanthanide halide--aluminum halide molecular species
The absorption spectrum of ErCl/sub 3/ (AlCl/sub 3/)/sub x/ vapor complex was measured and analyzed using the Judd-Ofelt theory. Structural correlations in other AlCl/sub 3/ vapor complexes and radiation emission are discussed. Fluorescence of TbCl/sub 3/ (AlCl/sub 3/)/sub x/ vapor complex and in the NdCl/sub 3/ (AlCl/sub 3/)/sub x/ system were studied. (DLC)
Date:
January 1, 1977
Creator:
Carnall, W T; Hessler, J P; Williams, C W & Hoekstra, H R
Object Type:
Article
System:
The UNT Digital Library
TFTR coil case design
The TFTR (TOKAMAK Fusion Test Reactor) TF (Toroidal Field) coil cases are highly loaded structures designed within severe constraints. Foremost among these are basic machine geometry, material characteristics of both the case and the copper/epoxy matrix it supports, and overall cost. Scoping and parametric studies have been performed continuously since conceptual design. The progression of design decisions including coil shape, support locations and their stiffnesses, material selection, and element sizing are described. The significant variables are identified for each of the studies. The current coil case design is presented in detail along with aspects of the design still under consideration. Questions that remain involve the effects of limitations placed upon the coil materials (copper, epoxy) themselves. Resolution of these questions is to be accomplished by development tests of coil elements similar to those in the current design. Two alternate designs have been held in reserve pending completion of the development tests. Each is briefly described as to its basic configuration, potential for improvement, and its effect on the overall device.
Date:
January 1, 1977
Creator:
Pusateri, J.; Barnes, G. & Citrolo, J.
Object Type:
Article
System:
The UNT Digital Library
Tilt-pour melt-caster for encapsulation of radioactive cesium
Use of the tilt-pour melt-caster makes distinct improvements in the cesium encapsulation process. Compared to the vacuum castings system now in use, the tilt-pour equipment requires no reliance on heat-traced transfer lines, less sealing pressure for capsule filling, is less corrosive to capsules and is easier to repair. From the results of the extensive development program, it is concluded that the tilt-pour melt-caster can be operated to meet the cesium encapsulation production and maintenance requirements.
Date:
January 1, 1977
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
High-temperature of thermodynamic properties of sodium
The set of high-temperature thermodynamic properties for sodium in the two-phase and subcooled-liquid regions which was previously recommended, has been modified to incorporate recent experimental data. In particular, replacement of the previously estimated critical constants with experimentally-determined values has resulted in substantial differences in the region of the critical point. The following thermodynamic properties were determined: pressure, density, enthalpy, entropy, internal energy, compressibility (adiabatic and isothermal), thermal expansion coefficient, thermal pressure coefficient, and specific heat (constant-pressure and constant-volume). These properties were determined for the saturated liquid, saturated vapor, subcooled liquid, and superheated vapor. The superheated vapor properties are limited to low pressures and more work is required to extend them to higher pressures. The supercritical region was not investigated.
Date:
January 1, 1977
Creator:
Padilla, A. Jr.
Object Type:
Report
System:
The UNT Digital Library
Plutonium, americium, and uranium in blow-sand mounds of safety-shot sites at the Nevada Test Site and the Tonopah Test Range
Blow-sand mounds or miniature sand dunes and mounds created by burrowing activities of animals were investigated by the Nevada Applied Ecology Group (NAEG) to determine the influence of mounds on plutonium, americium, and uranium distributions and inventories in areas of the Nevada Test Site and Tonopah Test Range. Those radioactive elements were added to the environment as a result of safety experiments of nuclear devices. Two studies were conducted. The first was to estimate the vertical distribution of americium in the blow-sand mounds and in the desert pavement surrounding the mounds. The second was to estimate the amount or concentration of the radioactive materials accumulated in the mound relative to the desert pavement. Five mound types were identified in which plutonium, americium, and uranium concentrations were measured: grass, shrub, complex, animal, and diffuse. The mount top (that portion above the surrounding land surface datum), the mound bottom (that portion below the mound to a depth of 5 cm below the surrounding land surface datum), and soil from the immediate area surrounding the mound were compared separately to determine if the radioactive elements had concentrated in the mounds. Results of the studies indicate that the mounds exhibit higher concentrations of plutonium, …
Date:
January 1, 1977
Creator:
Essington, E. H.; Gilbert, R. O.; Wireman, D. L.; Brady, D. N. & Fowler, E. B.
Object Type:
Article
System:
The UNT Digital Library
Gas breakers for tokamak OHMIC-heating duty
The current interrupting capacity of air blast and SF/sub 6/ breakers is reviewed for application in tokamak ohmic-heating circuits. Particular attention is paid to generator breakers for their large current interrupting capacity and suitability for ohmic-heating circuits.
Date:
January 1, 1977
Creator:
Vogel, H.F.
Object Type:
Article
System:
The UNT Digital Library
Vacuum considerations summary
The vacuum system for Heavy Ion Fusion machines can be divided according to pressure into 4 parts: (a) Ion Sources; (b) Linear Accelerators; (c) Circular Accelerators, Accumulators and Storage Rings; and (d) Reactors. Since ion sources will need rather conventional pumping arrangements and reactors will operate with greater pressures, depending on their mode of operation, only items b and c will be treated in this report. In particular, the vacuum system design will be suggested for the machines proposed by various scenarios arrived at during the workshop. High mass numbers will be assumed.
Date:
January 1, 1977
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Proposal to assemble a high resolution-electron sensitive-energy flow calorimeter in the NEULAND spectrometer
A ..gamma.. catcher and a liquid scintillation calorimeter module in a simple configuration that is well suited to the investigation of several different neutrino induced processes are described. The variety of neutrino beams now available at Fermilab and synchrotron intensity and energy together with the high resolution calorimeter allow a multiplicity of experiments to be carried out with a single detector configuration.
Date:
January 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Isolation of pathogenic Naegleria from artificially heated waters
Investigations were undertaken to determine whether heated waters facilitate the proliferation of free-living amoeba that cause primary amoebic meningoencephalitis. Water samples were taken close to the discharges of power plants situated on lakes or rivers in Florida and Texas and from cooling towers in Tennessee. The water temperatures ranged from 29 to 42/sup 0/C. Water samples were also taken from several lakes in Florida and Texas without associated power plants. The water temperatures of these ranged from 30/sup 0/ to 34/sup 0/C. Twenty-five-250-ml samples were filtered through membranes. Samples taken from the control lakes and cooling towers showed no growth of pathogenic amoeba, whereas growth was obtained from 2 of the 8 lakes and rivers in Florida and from 1 of the 7 man-made lakes in Texas that were artificially heated. The amoebae were identified as belonging to the genus Naegleria from their trophozoite and cyst structure, ability to grow at 45/sup 0/C, to transform into flagellates, and to produce primary amebic meningoencephalitis (PAME) in mice after intranasal instillation. Their identification as N. fowleri was confirmed by indirect immunofluorescent analysis with antiserum produced against N. fowleri. These findings indicate that artificial heating of waters may facilitate the growth of pathogenic …
Date:
January 1, 1977
Creator:
Tyndall, R L; Willaert, E; Stevens, A R & Coutant, C C
Object Type:
Article
System:
The UNT Digital Library
Electron transfer reactions of metal complexes in solution
A few representative electron-transfer reactions are selected and their kinetic parameters compared with the predictions of activated complex models. Since Taube has presented an elegant treatment of intramolecular electron-transfer reactions, emphasis is on bimolecular reactions. The latter electron-transfer reactions are more complicated to treat theoretically since the geometries of their activated complexes are not as well known as for the intramolecular case. In addition in biomolecular reactions, the work required to bring the two reactants together needs to be calculated. Since both reactants generally carry charges this presents a non-trivial problem at the ionic strengths usually used to study bimolecular electron transfer.
Date:
January 1, 1977
Creator:
Sutin, N.
Object Type:
Article
System:
The UNT Digital Library
Microscopic theory of charges density wave instability in NbSe/sub 2/
The microscopic theory of Sinha and Harmon for electronically driven lattice instabilities is used to explain the ''Kohn-like'' anomalies in the ..sigma../sub 1/ phonon branch and the observed incommensurate superlattice Bragg peak in 2H-NbSe/sub 2/, characteristic of the charge density wave at low temperatures in the neutron scattering experiments of Moncton et al. In accordance with the APW and LCAO band-structure calculations of Mattheiss of 2H-NbSe/sub 2/, the presence of three narrow d bands of atomic symmetry xy, x/sup 2/-y/sup 2/ and 3z/sup 2/-r/sup 2/ at the Fermi level is assumed. Thus the conduction-band wave function is represented by a linear combination of tight-binding Gaussian atomic orbitals with neglect of the variation of the radial wave function across the bands. The screened electron-ion interaction and the Coulomb energy of the charge fluctuation on the d shells of Nb atoms is represented by a pseudopotential screened by the Lindhard dielectric function. The phonon eigenvectors needed for estimating the electron-phonon interaction were calculated using a simple force constant model. In agreement with the experimental results, it was found that the phonon frequencies for the ..sigma../sub 1/ and ..sigma../sub 3/ branches are very strongly renormalized as one approaches the zone boundary. By introducing …
Date:
January 1, 1977
Creator:
Das, S G; Sinha, S K & Wakabayashi, N
Object Type:
Article
System:
The UNT Digital Library
Application of direct contact heat exchangers to geothermal power production cycles. Project review, December 1, 1974--May 31, 1977
Work performed on the development of direct contact heat exchanger power cycles for geothermal applications is reviewed. The period covered in the report is from the inception of the project in 1974 through May 31, 1977. Results from a large experimental program on heat exchanger develpment as well as from many analyses of components and cycle performance and economics are given. A number of working fluids and operating conditions have been considered, and no major obstacles for the implementation of the concept have been discovered.
Date:
January 1, 1977
Creator:
Jacobs, H. R.; Boehm, R. F. & Hansen, A. C.
Object Type:
Report
System:
The UNT Digital Library