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Office of Scientific & Technical Information Technical Reports
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Congressional Research Service Reports
131
Defense Base Closure and Realignment Commission
127
Texas Attorney General Opinions
53
Government Accountability Office Reports
51
Texas Patents
48
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Texas Pecan Pest Management Newsletter, Volume 94, Number 6, July 1994
Newsletter focusing on pecan disease and pest control in Texas, including prevention, identification, treatment, and educational opportunities.
Date:
July 11, 1994
Creator:
Texas Agricultural Extension Service
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Newsletter of Texas State Representative Art Fierro: Volume 2, July 2019
Newsletter of Art Fierro for his constituents in district 79 discussing news, activities, and various updates related to work in the Texas legislature. It focuses on the 86th Legislative Session, including bills signed signed by the Governor and other actions.
Date:
July 11, 2019
Creator:
Fierro, Peter Arthur
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Radiological Sciences Department Quarterly Progress Report Research and Development Activities April - June, 1955
This report constitutes the Quarterly Progress Report covering April-June 1955, for the Health Instruments Division research and development activities. Most of the studies described concern the biological fate, environmental transport of radioactive effluents, or development of instrumentation for radiation detection.
Date:
July 11, 1955
Creator:
Parker, H. M.
Object Type:
Report
System:
The UNT Digital Library
Manufacture of Aluminum Chloride.
Patent for the manufacture of Aluminum Chloride that can be carried out at lower temperatures with aluminum ore or compound, such as bauxite, sulfur and chlorine, and involves no cooking.
Date:
July 11, 1922
Creator:
Hall, Frank W.
Object Type:
Patent
System:
The Portal to Texas History
Gripping Device.
Patent for equipment for use in the drilling of wells to help with the placement of casing, pipes, etc. by holding it in place
Date:
July 11, 1922
Creator:
Moody, Joseph F.
Object Type:
Patent
System:
The Portal to Texas History
[News Release: Comptroller Distributes Sales Tax Revenue, July 11, 2018]
News release documenting Texas monthly sales tax revenue for July, 2015 with a general summary and table of local sales tax allocations.
Date:
July 11, 2018
Creator:
Texas. Comptroller's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Racing Commission Annual Report: 1999
Annual report of the Texas Racing Commission describing goals, activities, and accomplishments during the fiscal year 1999.
Date:
July 11, 2000
Creator:
Texas Racing Commission
Object Type:
Report
System:
The Portal to Texas History
Relationships Between States of Nuclei With Constant Neutron Excess
From introduction: "In order to locate systematic trends of states with a certain angular momentum and parity Jπ in nuclei having constant neutron excess, both the ground state and the level energies will be considered simultaneously: we plot the total nuclear binding energy or nuclidic mass excess of excited states, whereby the ground states appear as a special case. Such a natural correlation of level schemes has been employed before Inglis already in 1953."
Date:
July 11, 1962
Creator:
Everling, F.
Object Type:
Report
System:
The UNT Digital Library
Water Spectra and Energy Exchange Kernels
Many measurement of neutron spectra have been made in water assemblies. In these system a large part of the spectrum is given by an essentially Maxwellian distribution at the moderator temperature which is insensitive to the scattering model. Hence, the test of the energy exchange scattering kernel is in the difference of the spectrum and the fundamental or Maxwellian component. The figure shows the spectrum for the Nelkin model. Once the fundamental has been subtracted neither theoretical model seems to fit the data extremely well. Below kT the Nelkin model is a closer fit than the gas model but it underestimates the deviation from the Maxwellian whereas in the joining region it overestimates the distortion.
Date:
July 11, 1963
Creator:
Daitch, Paul B. (Paul Bernard), 1925- & Ohanian, M. J.
Object Type:
Report
System:
The UNT Digital Library
Large area silicon sheet task low-cost silicon solar array project. Sixth quarterly progress report, 4 April 1977--1 July 1977
Silicon ribbons were grown in the presence of some air back-streaming and were consistently polycrystalline with little evidence of oriented growth from the seed. The problem of back-diffusion of air from the exit port has been eliminated, and clean growth conditions, as determined by silicon wafer film test, have been obtained in the redesigned seeded growth furnace. This furnace developed a water leak in the cooling nozzle, so it has not as yet been used to grow silicon. A new, vertical seeded growth furnace, which permits the seeding and initial crystal growth to take place below the alloy surface, has been designed and is being built.
Date:
July 11, 1977
Creator:
Garfinkel, M. & Hall, R. N.
Object Type:
Report
System:
The UNT Digital Library
An Emendation of R.G. Collingwood's Doctrine of Absolute Presuppositions
Document discussing Collingwood's Doctrine of Absolute Presupposition and theory of the nature of metaphysics.
Date:
July 11, 1973
Creator:
Ketner, Kenneth Laine
Object Type:
Report
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 47, Number 27, July 11, 1987
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
July 11, 1987
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
On the Existence of Pathological Detonation Waves
Pathological detonation waves with velocities greater than Chapman-Jouguet (C-J) have been proposed theoretically but never observed experimentally in gaseous, liquid or solid explosives. Two types of pathological chemical reaction zones have been identified within the Zeldovich-von Neumann-Doring (ZND) model: an exothermic chemical decomposition with a mole decrease during from the von Neumann spike state to the C-J state and an exothermic reaction followed by an endothermic reaction (eigenvalue detonation). The high temperatures reached in detonation reaction zones cause sufficient radial and atom formation to insure overall mole increases in gaseous H{sub 2} + O{sub 2} detonations. Aluminized explosives exhibit a slight mole decrease when the solid aluminum particles are oxidized, but this does not negate the large mole increase that occurs during explosive decomposition. Porous solid explosives whose products form with more cold compression energy than that of the solid are an unlikely possibility for pathological detonation. Eigenvalue detonations have been postulated for H{sub 2} + Cl{sub 2} gas phase detonations and for plastic bonded solid explosives if endothermic binder decomposition follows exothermic explosive decomposition. Chemical kinetic and physical arguments are presented to eliminate these possible pathological detonations. In the case of H{sub 2} + Cl{sub 2}, highly vibrationally excited …
Date:
July 11, 2003
Creator:
Tarver, Craig M.
Object Type:
Article
System:
The UNT Digital Library
Review of Excess Weapons Plutonium Disposition LLNL Contract Work in Russia-(English)
This third meeting of the recently completed and ongoing Russian plutonium immobilization contract work was held at the State Education Center (SEC) in St. Petersburg on January 14-18, 2002. The meeting agenda is reprinted here as Appendix A and the attendance list as Appendix B. The meeting had 58 Russian participants from 21 Russian organizations, including the industrial sites (Mayak, Krasonayarsk-26, Tomsk), scientific institutes (VNIINM, KRI, VNIPIPT, RIAR), design organizations (VNIPIET and GSPI), universities (Nyzhny Novgorod, Urals Technical), Russian Academy of Sciences (Institute of Physical Chemistry or IPhCh, Institute of Ore-Deposit Geology, Petrography, Mineralogy, and Geochemistry or IGEM), Radon-Moscow, S&TC Podol'osk, Kharkov-Ukraine, GAN-SEC-NRS and SNIIChM, the RF Ministry of Atomic Energy (Minatom) and Gosatomnadzor (GAN). This volume, published by LLNL, documents this third annual meeting. Forty-nine technical papers were presented by the Russian participants, and nearly all of these have been collected in this Proceedings. The two objectives for the meeting were to: (1) Bring together the Russian organizations, experts, and managers performing this contract work into one place for four days to review and discuss their work amongst each other. (2) Publish a meeting summary and proceedings of all the excellent Russian plutonium immobilization and other plutonium disposition contract …
Date:
July 11, 2002
Creator:
Jardine, L & Borisov, G B
Object Type:
Report
System:
The UNT Digital Library
Hydroacoustic Blockage Calibration for Discrimination
The core focus of this hydroacoustic research is to develop a better understanding of hydroacoustic blockage to better predict those stations that can be used in discrimination analysis for any particular event. The research involves two approaches: (1) model-based assessment of blockage and (2) ground-truth data-based assessment of blockage. The goal is to reliably determine all hydroacoustic stations that can be brought to bear on a discrimination analysis from any event location in the world s oceans. An important aspect of this capability is to include reflected T-phases where they reliably occur since reflected T-phases can allow station utilization when the direct path is otherwise completely blocked. We have conceptually designed an approach to automate assessment procedures that will allow both model-based and data-based methodologies to be utilized and in the future, integrated. We have modified the HydroCAM model-based network assessment code to include variable density bathymetry grids. This will improve the reliability of model-based blockage assessment as dense bathymetry grids are added to the bathymetry database where available and needed. We are also running the HydroCAM code to produce blockage grids in the Indian Ocean for many different blockage criteria. We have been building the database necessary to begin …
Date:
July 11, 2003
Creator:
Harben, Philip E.; Matzel, Eric; Upton, Zachary & Pulli, Jay J.
Object Type:
Article
System:
The UNT Digital Library
Edge Detection to Isolate Motion in Adaptive Optics Systems
Adaptive optics uses signal processing techniques and deformable mirrors to minimize image degradation caused by phase aberrations. In the case of telescope imaging, the atmosphere causes phase aberrations. In the case of satellite imaging, errors due to the ultra-light-weight characteristics of the primary mirror cause phase aberrations. Scene-based Shack-Hartmann Wave Front Sensing takes the correlation between successive wavelets to determine these phase aberrations. A large problem with the scene-based approach is that motion, such as a moving car, can cause the correlation of two lenslets to peak, not where the scenes align, but where the moving object in each frame aligns. As such, the continued use of scene-based Wave Front Sensing necessitates successful isolation of moving objects from a stationary background scene. With the knowledge of which pixels are immobile, one should avoid the problem of locking onto a moving object when taking the correlation of two successive frames in time. Two main requirements of isolation are consistency and efficiency. In this document I will discuss the different edge detection algorithms explored for moving object isolation and how I came to the conclusion that, for our purposes of scene-based Shack-Hartmann WFS, edge detection is too inconsistent to be of any …
Date:
July 11, 2003
Creator:
Chan, C W
Object Type:
Report
System:
The UNT Digital Library
Pressure Wave Measurements Resulting from Thermal Cook-Off of the HMX Based High Explosive LX-04
Experiments that investigate thermal and nearby explosion scenarios are needed to provide essential data to models for accurate predictions. A porous LX-04 (85/15 wt% HMX/Viton) sample was heated in a heavily confined donor charge until it thermally exploded. The reaction accelerated a steel cover plate across a 10 cm gap into a preheated gauged acceptor cylinder (near its theoretical maximum density) of LX-04. The carbon resistor gauges in the acceptor measured the resulting multi-dimensional ramp wave as it propagated through the pre-heated LX-04. Detonation of the LX-04 acceptor does not occur. Results are compared to similar experiments with acceptors at room temperature.
Date:
July 11, 2003
Creator:
Garcia, F.; Vandersall, K. S.; Forbes, J. W.; Tarver, Craig M. & Greenwood, D.
Object Type:
Article
System:
The UNT Digital Library
Fast timing discriminator
The processing of pulses with very fast risetimes for timing purposes involves many problems because of the large equivalent bandwidths involved. For pulses with risetimes in the 150 ps range (and full widths at half maximum (FWHM) of 400 ps) bandwidths in excess of 1GHz are required. Furthermore, these very narrow pulses with current amplitudes as small as 1 mA carry very small charges (<10/sup -12/ coulomb), therefore, requiring very sensitive trigger circuits. The difficulty increases when timing characteristics in the picosecond range are sought especially when a wide input signal amplitude range causes a time-walk problem. The fast timing discriminator described has a time-walk of approximately +-75 ps over the input signal range from 80 mV to 3V. A schematic of the discriminator is included, and operation and performance are discussed.
Date:
July 11, 1977
Creator:
Lo, C. C.
Object Type:
Report
System:
The UNT Digital Library
The TDF System for Thermonuclear Plasma Reaction Rates, Mean Energies and Two-Body Final State Particle Spectra
The rate of thermonuclear reactions in hot plasmas as a function of local plasma temperature determines the way in which thermonuclear ignition and burning proceeds in the plasma. The conventional model approach to calculating these rates is to assume that the reacting nuclei in the plasma are in Maxwellian equilibrium at some well-defined plasma temperature, over which the statistical average of the reaction rate quantity {sigma}v is calculated, where {sigma} is the cross-section for the reaction to proceed at the relative velocity v between the reacting particles. This approach is well-understood and is the basis for much nuclear fusion and astrophysical nuclear reaction rate data. The Thermonuclear Data File (TDF) system developed at the Lawrence Livermore National Laboratory (Warshaw 1991), which is the topic of this report, contains data on the Maxwellian-averaged thermonuclear reaction rates for various light nuclear reactions and the correspondingly Maxwellian-averaged energy spectra of the particles in the final state of those reactions as well. This spectral information closely models the output particle and energy distributions in a burning plasma, and therefore leads to more accurate computational treatments of thermonuclear burn, output particle energy deposition and diagnostics, in various contexts. In this report we review and derive …
Date:
July 11, 2001
Creator:
Warshaw, S I
Object Type:
Report
System:
The UNT Digital Library
Shock Sensitivity of LX-04 Containing Delta Phase HMX at Elevated Temperatures
LX-04 is a widely used HMX-based plastic bonded explosive, which contains 85 weight % HMX and 15 weight % Viton binder. The sensitivity of LX-04 to a single stimulus such as heat, impact, and shock has been previously studied. However, hazard scenarios can involve multiple stimuli, such as heating to temperatures close to thermal explosion conditions followed by fragment impact, producing a shock in the hot explosive. The sensitivity of HMX at elevated temperatures is further complicated by the beta to delta solid-state phase transition, which occurs at approximately 165 C. This paper presents the results of shock initiation experiments conducted with LX-04 preheated to 190 C, as well as density measurements and small scale safety test results of the {delta} phase HMX at room temperature. This work shows that LX-04 at 190 C is more shock sensitive than LX-04 at 150 C or 170 C due to the volume increase during the {beta} to {delta} solid phase transition, which creates more hot spots, and the faster growth of reaction during shock compression.
Date:
July 11, 2003
Creator:
Urtiew, P A; Forbes, J W; Tarver, C M; Vandersall, K S; Garcia, F; Greenwood, D W et al.
Object Type:
Article
System:
The UNT Digital Library
Solution Based Deposition of Polyimide Ablators for NIF Capsules
Between June 1997 and March 2002 Luxel Corporation was contracted to explore the possibility of preparing NIF scale capsules with polyimide ablators using solution-based techniques. This work offered a potential alternative to a vapor deposition approach talking place at LLNL. The motivation for pursuing the solution-based approach was primarily two-fold. First, it was expected that much higher strength capsules (relative to vapor deposition) could be prepared since the solution precursors were known to produce high strength films. Second, in applying the ablator as a fluid it was expected that surface tension effects would lead to very smooth surfaces. These potential advantages were offset by expected difficulties, primary among them that the capsules would need to be levitated in some fashion (for example acoustically) during coating and processing, and that application of the coating uniformly to thicknesses of 150 pm on levitated capsules would be difficult. Because of the expected problems with the coupling of levitation and coating, most of the initial effort was to develop coating and processing techniques on stalk-mounted capsules. The program had some success. Using atomizer spray techniques in which application of {approx}5 {micro}m fluid coatings were alternated with heating to remove solvent resulted in up to …
Date:
July 11, 2002
Creator:
Cook, R
Object Type:
Report
System:
The UNT Digital Library
Proceedings of Riken Bnl Research Center Workshop: Rbrc Qcdoc Computer Dedication and Symposium on Rbrc Qcdoc (Volume 74).
None
Date:
July 11, 2005
Creator:
Organizers: Ozaki, S. & Samios, N. P.
Object Type:
Report
System:
The UNT Digital Library
Computer Simulations to Study the High-Pressure Deflagration of HMX
The accepted micro-mechanical picture of the build-up of detonation in solid explosives from a shock is that imperfections are a source of hot spots. The hot spots ignite and link up in the reaction zone by high-pressure deflagration. Although the deflagration is subsonic, there are so many ignition sites that the pressure build-up is rapid enough to strengthen the initial shock. Quantitative advances in this research require a detailed understanding of deflagration at the high pressure, 1 to 50 GPa, which is present in the reaction zone. We performed direct numerical simulations of high-pressure deflagrations using a simplified global (3-reaction) chemical kinetics scheme. We used ALE-3D to calculate coupled chemical reactions, heat transfer, and hydrodynamic flow for finite-difference zones comprising a mixture of reactants and products at pressure and temperature equilibrium. The speed of isobaric deflagrations depends on the pressure and initial temperature. We show how this dependence changes with kinetic parameters, including the order of the last reaction step and the heat of formation of the species formed, relative to the reactant.
Date:
July 11, 2003
Creator:
Reaugh, J E
Object Type:
Article
System:
The UNT Digital Library
Data Collection in the Arabian Peninsula for Nuclear Explosion Monitoring
We report results from the second year of our project (ROA0101-35) to collect seismic event and waveform data recorded in and around the Arabian Peninsula. This effort involves several elements. We have a temporary broadband seismic station operating near the IMS primary array site (PS38) in central Saudi Arabia. We recently installed two temporary broadband stations in the United Arab Emirates (funded by NNSA NA-24 Office of Non-Proliferation & International Security). We are working with King Abdulaziz city for Science and Technology to collect and analyze data from the Saudi National Seismic Network, that consist of 37 digital three-component stations (26 broadband and 11 short-period). We are collaborating with Kuwait Institute for Scientific Research (KISR) to analyze data from their 8 station national seismic network. We participated in the Workshop on Reference Events odnear the Dead Sea Rift held in Paris, France in October 2002. In this paper we present results of these efforts including integration of the raw data into LLNL's Seismic Research Database and preliminary analysis of event locations and source parameters and inference of earth structure.
Date:
July 11, 2003
Creator:
Rodgers, A; Tkalcic, H & Al-Amri, A M S
Object Type:
Article
System:
The UNT Digital Library