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[Photograph 2012.201.B0235.0121]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mrs. C. D. Gerard, who calls Oklahoma City her home, joins a group of her girls on the balcony of the Alpha Chi Omega sorority house."
Date:
February 7, 1947
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[News Script: Heart Association]
Script from the WBAP-TV/NBC station in Fort Worth, Texas, covering a news story about Southern Methodist University's fraternities aiding the Dallas Heart Association.
Date:
February 19, 1962
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
Measurement of the alpha asymmetry parameter for the Omega- ---> Lambda K- decay
None
Date:
February 1, 2005
Creator:
Chen, Y. C.; /Taiwan, Inst. Phys.; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Choong, W. S. et al.
Object Type:
Article
System:
The UNT Digital Library
[Pamphlet: Alpha Kappa Alpha Sorority, Inc Salutes Black History Month Annual Song Fest]
Pamphlet containing information about the "Alpha Kappa Omega Chapter of Alpha Kappa Alpha Sorority, Inc Salutes Black History Month Annual Song Fest" taking place on February 19, 1989 at Trinity United Methodist Church in Houston.
Date:
February 1989
Creator:
Alpha Kappa Alpha Sorority
Object Type:
Pamphlet
System:
The Portal to Texas History
Optics Performance at 1(omega), 2 (omega), and 3 (omega): Final Report on LDRD Project 03-ERD-071
The interaction of intense laser light with dielectric materials is a fundamental applied science problem that is becoming increasingly important with the rapid development of ever more powerful lasers. To better understand the behavior of optical components in large fusion-class laser systems, we are systematically studying the interaction of high-fluence, high-power laser light with high-quality optical components, with particular interest on polishing/finishing and stress-induced defects and surface contamination. We focus on obtaining comparable measurements at three different wavelengths, 1{omega} (1053 nm), 2{omega} (527 nm), and 3{omega} (351 nm).
Date:
February 8, 2006
Creator:
Honig, J.; Adams, J.; Carr, C.; Demos, S.; Feit, M.; Mehta, N. et al.
Object Type:
Report
System:
The UNT Digital Library
Devloping High Energy Radiography for HED Experiments on NIF and Omega-EP
High energy radiography capabilities are essential for many future DNT/HED experiments on NIF. We have been developing bright, high-energy (15-100 keV), high resolution (< 20 {micro}m), 1-D and 2-D radiography solutions for DNT experiments on NIF. In this LDRD, we have made significant progress utilizing high-energy, high-intensity, short-pulse lasers to generate hard K-{alpha} photons. High energy K-{alpha} sources are created by hot electrons interacting in the target fluor material after irradiation by lasers with intensity I{sub L} > 10{sup 17} W/cm{sup 2}. High resolution point projection 1-D and 2-D radiography have been achieved using {mu}-foil and {mu}-wire targets attached to low-Z substrate materials. The {mu}-wire size was 10 x 10 x 300 {micro}m on a 300 x 300 x 5 {micro}m CH substrate creating the point source size equivalent to these micro targets. This unique technique will utilize the NIF short pulse laser (ARC) as a backlighter suitable for the full range of DNT science experiments on NIF.
Date:
February 14, 2008
Creator:
Maddox, B.; Tommasini, R.; Remington, B.; Key, M. & Town, R.
Object Type:
Report
System:
The UNT Digital Library
Deformation Induced Hierarchical Twinning Coupled with Omega Transformation in a Metastable β-Ti Alloy
This article looks at hierarchical twinning in metastable body-centered cubic (bcc) β-titanium alloy on tensile deformation.
Date:
August 15, 2015
Creator:
Mantri, Srinivas Aditya; Sun, F.; Choudhuri, Deep; Alam, Talukder; Gwalani, Bharat; Prima, Frederic et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0318B.0055]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Two benefit performances will be staged at Oklahoma City University at 8:15 p.m. Friday and Saturday by members of Alpha Psi Omega, honorary dramatic fraternity at OCU."
Date:
February 24, 1967
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Memorial Program for Juanita A. Van Dorn, February 9, 2001]
Memorial service program for Soror Juanita A. Van Dorn, born September 19, 1919 and died February 3, 2001. The funeral was held February 9, 2001 at Sutton and Sutton Mortuary, Inc. Memorial service arrangements were made by the Alpha Tau Omega Chapter of Alpha Kappa Alpha Sorority, Inc. Includes one newspaper clipping.
Date:
February 9, 2001
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
LLE Review, Quarterly Report: Volume 72, July-September 1997
This volume of the LLE Review, covering the period July--September 1997, begins with a general introduction to LLE`s experimental physics program and a report on recent results. This article includes a useful summary of the system`s operational capabilities and system parameters. Other highlights of the wide variety of research presented in this issue are: a promising method to directly observe the cold compressed shell of an imploding target. The shell is normally observed by backlighting. The proposal described here is to use a high-Z dopant that fluoresces under radiation from the hot core in the K{alpha} line. A study of the instabilities associated with near-forward stimulated Brillouin scattering. It includes a calculation of the saturation times and steady-state gain exponents. A successful program of pulse shaping for the OMEGA laser system. Examples of a variety of pulse shapes that can be programmed are presented. A description of the angular-scattering characteristics of ferroelectric liquid crystal electro-optical devices operating in transient and extended scattering modes. The possibility of applying these devices as modulators in practical IR imaging systems is evaluated. A faster method of shaping and finishing IR materials by the use of magnetorheological fluids. Detailed specifications and test results are included. …
Date:
February 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Los Alamos National Laboratory Transuranic Waste Retireval Project
This paper presents the status of the Los Alamos National Laboratory (LANL) project for remediation of transuranic (TRU) and TRU mixed waste from Pads 1, 2, and 4. Some of the TRU waste packages retrieved from Pad I are anticipated to be part of LANL`s initial inventory to be shipped to the Waste Isolation Pilot Plant (WIPP) in April 1998. The TRU Waste Inspectable Storage Project (TWISP) was initiated in February 1993 in response to the New Mexico Environment Department`s (NMED`s) Consent Agreement for Compliance Order, ``New Mexico Hazardous Waste Agreement (NMHWA) 93-03.`` The TWISP involves the recovery of approximately 16,865 TRU and TRU-mixed waste containers currently under earthen cover on Pads 1, 2, and 4 at Technical Area 54, Area G, and placement of that waste into inspectable storage. All waste will be moved into inspectable storage by September 30, 2003. Waste recovery and storage operations emphasize protection of worker safety, public health, and the environment.
Date:
February 1, 1997
Creator:
Montoya, G. M.; Christensen, D. V. & Stanford, A. R.
Object Type:
Article
System:
The UNT Digital Library
Nonambipolarity, orthogonal conductivity, poloidal flow, and torque
Nonambipolar processes, such as neutral injection onto trapped orbits or ripple-diffusion loss of ..cap alpha..-particles, act to charge a plasma. A current j/sub r/ across magnetic surfaces must arise in the bulk plasma to maintain charge neutrality. An axisymmetric, neoclassical model of the bulk plasma shows that these currents are carried by the ions and exert a j/sub r/B/sub theta/R/c torque in the toroidal direction. A driven poloidal flow V/sub theta/ = E/sub r/'c/B must also develop. The average current density <j/sub r/> is related to the radial electric field E/sub r/' = E/sub r/ + v/sub /phi//B/sub theta//c in a frame moving with the plasma via the orthogonal conductivity <j/sub r/> = sigma/sub /perpendicular//E/sub r/', which has the value sigma/sub /perpendicular// = (1.65epsilon/sup 1/2/)(ne/sup 2/..nu../sub ii//M..cap omega../sub theta//sup 2/) in the banana regime. If an ignited plasma loses an appreciable fraction ..delta.. of its thermonuclear ..cap alpha..-particles by banana ripple diffusion, then the torque will spin the plasma to sonic rotation in a time /tau//sub s/ approx. 2/tau//sub E//..delta.., /tau//sub E/ being the energy confinement time. 10 refs., 1 fig.
Date:
February 1, 1989
Creator:
Hulbert, G.W. & Perkins, F.W.
Object Type:
Report
System:
The UNT Digital Library
High resolution 17 keV to 75 keV backlighters for High Energy Density experiments
We have developed 17 keV to 75 keV 1-dimensional and 2-dimensional high-resolution (< 10 {micro}m) radiography using high-intensity short pulse lasers. High energy K-{alpha} sources are created by fluorescence from hot electrons interacting in the target material after irradiation by lasers with intensity I{sub L} > 10{sup 17} W/cm{sup 2}. We have achieved high resolution point projection 1-dimensional and 2-dimensional radiography using micro-foil and micro-wire targets attached to low-Z substrate materials. The micro-wire size was 10 {micro}m x 10 {micro}m x 300 {micro}m on a 300 {micro}m x 300 {micro}m x 5 {micro}m CH substrate. The radiography performance was demonstrated using the Titan laser at LLNL. We observed that the resolution is dominated by the micro-wire target size and there is very little degradation from the plasma plume, implying that the high energy x-ray photons are generated mostly within the micro-wire volume. We also observe that there are enough K{alpha} photons created with a 300 J, 1-{omega}, 40 ps pulse laser from these small volume targets, and that the signal-to-noise ratio is sufficiently high, for single shot radiography experiments. This unique technique will be used on future high energy density (HED) experiments at the new Omega-EP, ZR and NIF facilities.
Date:
February 25, 2008
Creator:
Park, H.; Maddox, B. R.; Giraldez, E.; Hatchett, S. P.; Hudson, L.; Izumi, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Investigation on the long-term radiation hardness of low resistivity starting silicon materials for RT silicon detectors in high energy physics
Relatively low resistivity (200 to 1000 {Omega}-cm) starting silicon materials have been studied in the search of room temperature neutron radiation-hard silicon detectors. It has been found that, moderate resistivity (300-700 {Omega}-cm) silicon detectors, after being irradiated to 5.0 {times} 10{sup 13} to 2.0 {times} 10{sup 14} n/cm{sup 2}, are extremely stable in terms of the detector full depletion voltage (V{sub d}) or the net effective concentration of ionized space charges (N{sub eff} ---- there is little ``reverse annealing`` of N{sub eff} at RT and elevated temperatures as compared with large reverse annealing observed for high resistivity silicon detectors. Detectors with starting resistivity of 300-700 {Omega}-cm have been found to be stable, during the equivalent of one year RT anneal that would reach the saturation of the first stage of reverse anneal, within then N{sub eff} window of {vert_bar}N{sub eff}{vert_bar}{le} 2.5 {times} 10{sup 12} cm{sup {minus}3} (V{sub d} = 180 V for d = 300 {mu}m) in a working range of 5.0 {times} 10{sup 13} to 1.5 {times} 10{sup 14} n/cm{sup 2}, or a net neutron radiation tolerance of 1.0 {times} 10{sup 14} n/cm{sup 2}. The observed effects are in very good agreement with an early proposed model, which predicted …
Date:
February 1, 1994
Creator:
Li, Z.
Object Type:
Article
System:
The UNT Digital Library
Inertial confinement fusion target component fabrication and technology development support: Annual report, October 1, 1995--September 30, 1996
On December 30, 1990, the U.S. Department of Energy entered into a contract with General Atomics (GA) to be the Inertial Confinement Fusion (ICF) Target Component Fabrication and Technology Development Support contractor. In September 1995 this contract ended and a second contract was issued for us to continue this ICF target support work. This report documents the technical activities of the period October 1, 1995 through September 30, 1996. During this period, GA and our partners WJ Schafer Associates (WJSA) and Soane Technologies, Inc. (STI) were assigned 14 formal tasks in support of the Inertial Confinement Fusion program and its five laboratories. A portion of the effort on these tasks included providing direct {open_quotes}Onsite Support{close_quotes} at Lawrence Livermore National Laboratory (LLNL), Los Alamos National Laboratory (LANL), and Sandia National Laboratory Albuquerque (SNLA). We fabricated and delivered over 800 gold-plated hohlraum mandrels to LLNL, LANL and SNLA. We produced nearly 1,200 glass and plastic target capsules for LLNL, LANL, SNLA and University of Rochester/Laboratory for Laser Energetics (UR/LLE). We also delivered over 100 flat foil targets for Naval Research Lab (NRL) and SNLA in FY96. This report describes these target fabrication activities and the target fabrication and characterization development activities that …
Date:
February 1, 1997
Creator:
Hoppe, M.
Object Type:
Report
System:
The UNT Digital Library
Determination of the Fermi level position for neutron irradiated high resistivity silicon detectors and materials using the transient charge technique (TChT)
The transient charge technique (TChT) has been used in this work to study the electrical properties in both space charge region (SCR) and electrical neutral bulk (ENB) of neutron irradiated high resistivity (4--6 k{Omega}-cm) silicon particle detectors. Detectors irradiated to various neutron fluences were measured by TChT at various biases and temperatures below the room temperature. The Fermi level, obtained from the Arrhenius plot of the time constant of the slow component of the charge shape, has been found to stabilize around E{sub c}-0.47 to 0.50 eV at high fluences ({Phi}n>10{sup 13} n/cm{sup 2}). The resistivity of the ENB has been found greater than 300 k{Omega}-cm at high fluences.
Date:
February 1, 1994
Creator:
Eremin, V. & Li, Z.
Object Type:
Article
System:
The UNT Digital Library
The Dawn of a New Era for High Energy Density Physics
The field of High Energy Density (HED) physics is on the verge of a revolutionary event - the achievement of fusion ignition in the laboratory. New laser facilities, the OMEGA Extended Performance (EP) laser at the University of Rochester and the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, greatly extend the range of high energy density (HED) plasma conditions (including ignition) accessible in the laboratory. These conditions are among the most extreme obtainable, with pressures in excess of {approx}1,000,000 atmospheres. Experiments at these facilities will elucidate fundamental new science in astrophysics, materials science, laser-matter interactions, and other areas. The demonstration of fusion ignition will be the culmination of decades of research, and for the first time, will open the burning plasma regime to laboratory exploration. Ignition will spur the development of advanced options for clean, environmentally sustainable energy.
Date:
February 26, 2009
Creator:
Moses, E.; McCrory, R.; Meyerhofer, D. & Keane, C.
Object Type:
Article
System:
The UNT Digital Library
LLE Review, Quarterly Report: Volume 120, July-September 2009
This issue has the following articles: (1) The Omega Laser Facility Users Group Workshop; (2) The Effect of Condensates and Inner Coatings on the Performance of Vacuum Hohlraum Targets; (3) Zirconia-Coated-Carbonyl-Iron-Particle-Based Magnetorheological Fluid for Polishing Optical Glasses and Ceramics; (4) All-Fiber Optical Magnetic Field Sensor Based on Faraday Rotation in Highly Terbium Doped Fiber; (5) Femtosecond Optical Pump-Probe Characterization of High-Pressure-Grown Al{sub 0.86}Ga{sub 0.14}N Single Crystals; (6) LLE's Summer High School Research Program; (7) Laser Facility Report; and (8) National Laser Users Facility and External Users Programs.
Date:
February 19, 2001
Creator:
Edgell, Dana H.
Object Type:
Text
System:
The UNT Digital Library
Deep resistivity structure in southwestern Utah and its geothermal significance
Magnetotelluric (MT) measurements in southwestern Utah have yielded a model of resistivity structure in this area to a depth of about 100 km. The MT observations are strongly affected by Great Basin graben sedimentary fill, which constitutes conductive upper-crustal lateral inhomogeneity and requires simulation using two- and three-dimensional modeling algorithms before deeper portions of the resistivity section can be resolved. Included in the model is a layer of low resistivity (20 ..cap omega..-m) residing from 35 to 65 km depth. Sensitivity tests of the data to the structure weigh strongly against the top of this layer being as shallow as 25 km and against the conductivity and thickness of the layer being highly correlated. No intra-crustal low-resistivity layer is indicated by the MT data.
Date:
February 1, 1983
Creator:
Wannamaker, P. E.; Ward, S. H.; Hohmann, G. W. & Sill, W. R.
Object Type:
Report
System:
The UNT Digital Library
Microwave generation for magnetic fusion energy applications. Progress report, July 15, 1992--July 14, 1993
This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ {approx_lt} f {approx_lt} 150 GHz and with relatively modest voltage, we have been investigating the use of small period ({lambda}{sub {omega}} {approximately} 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high wiggler field at the center plane where the electrons are concentrated. The total current and power may then be increased without making current density excessive by increasing the wide dimension of the sheet beam. Sheet beam FEL design parameters for both a Proof-of-Principle (PoP) FEL experiment, which is current in progress, and an ITER relevant FEL design are shown. A central issue in the sheet beam FEL concept is propagation of the beam through the interaction region without excessive interception by the walls. In section 2 below we describe a successful experimental demonstration of sheet beam propagation through a 56 period uniform wiggler. Cold testing and initial hot test operation of the (PoP) FEL amplifier are also described. …
Date:
February 1, 1993
Creator:
Antonsen, T. M., Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Object Type:
Report
System:
The UNT Digital Library
Microwave generation for magnetic fusion energy applications
This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ [approx lt] f [approx lt] 150 GHz and with relatively modest voltage, we have been investigating the use of small period ([lambda][sub [omega]] [approximately] 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high wiggler field at the center plane where the electrons are concentrated. The total current and power may then be increased without making current density excessive by increasing the wide dimension of the sheet beam. Sheet beam FEL design parameters for both a Proof-of-Principle (PoP) FEL experiment, which is current in progress, and an ITER relevant FEL design are shown. A central issue in the sheet beam FEL concept is propagation of the beam through the interaction region without excessive interception by the walls. In section 2 below we describe a successful experimental demonstration of sheet beam propagation through a 56 period uniform wiggler. Cold testing and initial hot test operation of the (PoP) FEL amplifier are …
Date:
February 1, 1993
Creator:
Antonsen, T. M. Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Object Type:
Report
System:
The UNT Digital Library
Computational modeling of neoclassical and resistive MHD tearing modes in tokamaks
Numerical studies of the linear and nonlinear evolution of magnetic tearing type modes in three-dimensional toroidal geometry are presented. In addition to traditional resistive MHD effects, where the parameter {Delta}{prime} determines the stability properties, neoclassical effects have been included for the first time in such models. The inclusion of neoclassical physics introduces and additional free-energy source for the nonlinear formation of magnetic islands through the effects of a bootstrap current in Ohm`s law. The neoclassical tearing mode is demonstrated to be destabilized in plasmas which are otherwise {Delta}{prime} stable, albeit once an island width threshold is exceeded. The simulations are based on a set of neoclassical reduced magnetohydrodynamic (MHD) equations in three-dimensional toroidal geometry derived from the two-fluid equations in the limit of small inverse aspect ratio {epsilon} and low plasma pressure {beta} with neoclassical closures for the viscous force {del} {center_dot} {leftrightarrow}{pi}. The poloidal magnetic flux {psi}, the toroidal vorticity {omega}{sup {zeta}}, and the plasma pressure p are time advanced using the parallel projection of Ohm`s law, the toroidal projection of the curl of the momentum equation, and a pressure evolution equation with anisotropic pressure transport parallel to and across magnetic field lines. The equations are implemented in an …
Date:
February 1, 1996
Creator:
Gianakon, T.A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Infrared transient-liquid-phase joining of SCS-6/{beta}21S titanium matrix composite
Fiber-reinforced titanium matrix composites (TMCs) are among the advanced materials being considered for use in the aerospace industry due to their light weight, high strength, and high modulus. A rapid infrared joining process has been developed for the joining of composites and advanced materials. Rapid infrared joining has been shown not to have many of the problems associated with conventional joining methods. Two models were utilized to predict the joint evolution and fiber reaction zone growth. TMC, 16-ply SCS-6/{beta}21S, has been successfully joined with total processing times of under 2 min utilizing the rapid infrared joining technique. The process utilizes a 50 C/sec ramping rate, 17-{micro}m Ti-15Cu-15Ni wt % filler material between the faying surfaces; a joining temperature of 1,100 C; and 120 sec of time to join the composite material. Joint shear strength testing of the rapid infrared joints at temperatures as high as 800 C has revealed no joint failures. Also, due to the rapid cooling of the process, no poststabilization of the matrix material is necessary to prevent the formation of a brittle omega phase during subsequent use of the TMC at intermediate temperatures, 270 to 430 C, for up to 20 h.
Date:
February 1, 1996
Creator:
Blue, Craig A.; Sikka, Vinod K.; Blue, Randall A. & Lin, Ray Y.
Object Type:
Article
System:
The UNT Digital Library
Water Sorption and Radiolysis Studies for Neptunium Oxides
Plans are to convert the {sup 237}Np that is currently stored as a nitrate solution at the Savannah River Site to NpO{sub 2} and then ship it to the Y-12 National Security Complex in Oak Ridge for interim storage. This material will serve as feedstock for the {sup 238}Pu production program, and some will be periodically shipped to the Oak Ridge National Laboratory (ORNL) for fabrication into targets. The safe storage of this material requires an understanding of the radiolysis of moisture that is sorbed on the oxides, which, in turn, provides a basis for storage criteria (namely, moisture content). A two-component experimental program has been undertaken at ORNL to evaluate the radiolytic effects on NpO{sub 2}: (1) moisture uptake experiments and (2) radiolysis experiments using both gamma and alpha radiation. These experiments have produced two key results. First, the water uptake experiments demonstrated that the 0.5 wt % moisture limit that has been typically established for similar materials (e.g., uranium and plutonium oxides) cannot be obtained in a practical environment. In fact, the uptake in a typical environment can be expected to be at least an order of magnitude lower than the limit. The second key result is the …
Date:
February 3, 2004
Creator:
Icenhour, A.S.
Object Type:
Report
System:
The UNT Digital Library