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Molten salt processing of mixed wastes with offgas condensation

Description: We are developing an advanced process for treatment of mixed wastes in molten salt media at temperatures of 700--1000{degrees}C. Waste destruction has been demonstrated in a single stage oxidation process, with destruction efficiencies above 99.9999% for many waste categories. The molten salt provides a heat transfer medium, prevents thermal surges, and functions as an in situ scrubber to transform the acid-gas forming components of the waste into neutral salts and immobilizes potentially fugit… more
Date: May 13, 1991
Creator: Cooper, J.F.; Brummond, W.; Celeste, J.; Farmer, J.; Hoenig, C.; Krikorian, O.H. et al.
Partner: UNT Libraries Government Documents Department
open access

Algorithmic chemistry

Description: In this paper complex adaptive systems are defined by a self- referential loop in which objects encode functions that act back on these objects. A model for this loop is presented. It uses a simple recursive formal language, derived from the lambda-calculus, to provide a semantics that maps character strings into functions that manipulate symbols on strings. The interaction between two functions, or algorithms, is defined naturally within the language through function composition, and results i… more
Date: December 13, 1990
Creator: Fontana, W.
Partner: UNT Libraries Government Documents Department
open access

Volcanic ash: What it is and how it forms

Description: There are four basic eruption processes that produce volcanic ash: (1) decompression of rising magma, gas bubble growth, and fragmentation of the foamy magma in the volcanic vent (magmatic), (2) explosive mixing of magma with ground or surface water (hydrovolcanic), (3) fragmentation of country rock during rapid expansion of steam and/or hot water (phreatic), and (4) breakup of lava fragments during rapid transport from the vent. Variations in eruption style and the characteristics of volcanic … more
Date: September 13, 1991
Creator: Heiken, G.
Partner: UNT Libraries Government Documents Department
open access

Nuclear structure calculations for astrophysical applications

Description: Here we present calculated results on such diverse properties as nuclear energy levels, ground-state masses and shapes, {beta}-decay properties and fission-barrier heights. Our approach to these calculations is to use a unified theoretical framework within which the above properties can all be studied. The results are obtained in the macroscopic-microscopic approach in which a microscopic nuclear-structure single-particle model with extensions is combined with a macroscopic model, such as the l… more
Date: March 13, 1992
Creator: Moeller, P.; Kratz, K.L. (Mainz Univ. (Germany). Inst. fuer Kernchemie) & Nix, J.R. (Los Alamos National Lab., NM (United States))
Partner: UNT Libraries Government Documents Department
open access

Coulomb focusing and path'' interference of autoionizing electrons produced in 10 keV He sup + + He collisions

Description: Autoionizing electrons emitted following low energy ion-atom collisions may scatter significantly from the receding spectator ion's attractive Coulomb field. In such cases the observed electron intensity is focused'' in the direction of the scattering ion as a result of the effective compression of the emission solid angle. In addition, interference may occur between trajectories, corresponding to electrons scattering around opposite sides of the ion, which lead to the same final laboratory ele… more
Date: March 13, 1991
Creator: Swenson, J.K. (Lawrence Livermore National Lab., CA (USA)); Burgdoerfer, J. (Tennessee Univ., Knoxville, TN (USA)); Meyer, F.W.; Havener, C.C.; Gregory, D.C. & Stolterfoht, N. (Oak Ridge National Lab., TN (USA))
Partner: UNT Libraries Government Documents Department
open access

Modeling of large aperture third harmonic frequency conversion of high power Nd:glass laser systems

Description: To provide high-energy, high-power beams at short wavelengths for inertial-confinement-fusion experiments, we routinely convert the 1.053-{mu}m output of the Nova, Nd:phosphate-glass, laser system to its third-harmonic wavelength. We describe performance and conversion efficiency modeling of the 3 {times} 3 arrays potassium-dihydrogen-phosphate crystal plates used for type II/type II phase-matched harmonic conversion of Nova 0.74-m diameter beams, and an alternate type I/type II phase-matching … more
Date: March 13, 1991
Creator: Henesian, M. A.; Wegner, P. J.; Speck, D. R.; Bibeau, C.; Ehrlich, R. B.; Laumann, C. W. et al.
Partner: UNT Libraries Government Documents Department
open access

Behavior of TPC's in a high particle flux environment

Description: TPC's (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed.
Date: December 13, 1991
Creator: Etkin, A.; Eisemann, S. E.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S.; Love, W. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Sensitivity of numerical dispersion modeling to explosive source parameters

Description: The calculation of downwind concentrations from non-traditional sources, such as explosions, provides unique challenges to dispersion models. The US Department of Energy has assigned the Atmospheric Release Advisory Capability (ARAC) at the Lawrence Livermore National Laboratory (LLNL) the task of estimating the impact of accidental radiological releases to the atmosphere anywhere in the world. Our experience includes responses to over 25 incidents in the past 16 years, and about 150 exercises … more
Date: February 13, 1991
Creator: Baskett, R.L. (EG and G Energy Measurements, Inc., Pleasanton, CA (USA)) & Cederwall, R.T. (Lawrence Livermore National Lab., CA (USA))
Partner: UNT Libraries Government Documents Department
open access

Genetic algorithms for DNA sequence assembly

Description: This paper describes a genetic algorithm application to the DNA fragment assembly problems. The genetic algorithm uses a random key representation for representing the orderings of fragments. Two different fitness functions, both based on pairwise overlap strengths between fragments, were tested. The paper concludes that the genetic algorithm is a promising method for fragment assembly problems, achieving usable solutions quickly, but that the current fitness functions are flawed and that other… more
Date: April 13, 1993
Creator: Parsons, R.; Burks, C. (Los Alamos National Lab., NM (United States)) & Forrest, S. (New Mexico Univ., Albuquerque, NM (United States). Dept. of Computer Science)
Partner: UNT Libraries Government Documents Department
open access

Method of calculating test leakage rate for a spent fuel cask

Description: This report presents a method for calculating containment test leakage rates of radionuclides from an example spent fuel cask. Three releasable radioactive sources are considered: residual contamination in the cask cavity, crud on the fuel elements, and the radionuclides within the fuel rods. The ANSI N14.5 standard is used to calculate the test leakage rates from the maximum permissible releases determined from 10 CFR 71 containment requirements. 6 refs., 2 tabs.
Date: June 13, 1990
Creator: Fischer, L. E.
Partner: UNT Libraries Government Documents Department
open access

X-Ray Microcalorimeters With Germanium Resistance Thermometers

Description: We report on the current of our work on x-ray microcalorimeters for use as high resolution x-ray spectrometers. To maximize the x-ray collecting area and the signal to noise ratio, the total heat capacity of the device must be minimized. This is best achieved if the calorimeter is divided into two components, a thermal sensor and an x-ray absorber. The thermal sensor is a neutron transmutation doped (NTD) germanium resistor made as small as possible to minimize the heat capacity of the calorime… more
Date: August 13, 1990
Creator: Labov, S.; Silver, E.; Pfafman, T.; Wai, Y. (Lawrence Livermore National Lab., CA (USA)); Beeman, J.; Goulding, F. et al.
Partner: UNT Libraries Government Documents Department
open access

Recent Results on Charm Decays at Radical S Approx 10 GeV

Description: Recent results on decays of charm particles are presented. The CLEO collaboration has measured two body decay modes of D{sub s} involving {eta}, {eta}{sup 1} or {rho}{sup +}, using the new CLEO 2 detector. They also have new measurements of the branching ratios of the D{sup *0} and D{sup *+}. In charm baryon decays, results from CLEO 2 are presented for {Lambda}{sub c}{sup +} {yields} {Sigma}{sup 0}{pi}{sup +}, {Lambda}{sub c}{sup +} {yields} {Lambda}{pi}{sup +}{pi}{sup 0}, and the W-exchange p… more
Date: September 13, 1991
Creator: Procario, M.
Partner: UNT Libraries Government Documents Department
open access

Uncertainties in the Effects of Burnup and Their Impact on Criticality Safety Licensing Criteria

Description: Current criteria for criticality safety for spent fuel shipping and storage casks are conservative because no credit is permitted for the effects of burnup of the fuel inside the cask. Cask designs that will transport and store large numbers of fuel assemblies (20 or more) must devote a substantial part of their payload to criticality control measures if they are to meet this criteria. The Department of Energy is developing the data necessary to support safety analyses that incorporate the effe… more
Date: July 13, 1990
Creator: Carlson, Roger W. & Fisher, Larry E.
Partner: UNT Libraries Government Documents Department
open access

Bragg Crystal Polarimeter for the Spectrum-X-Gamma Mission

Description: We are designing a Bragg crystal polarimeter for the focal plane of the SODART telescope on the Spectrum-X-Gamma mission. A mosaic graphite crystal will be oriented at 45{degree} to the optic axis of the telescope, thereby preferentially reflecting those x-rays which satisfy the Bragg condition and have electric vectors that are perpendicular to the plane defined by the incident and reflected photons. The reflected x-rays will be detected by an imaging proportional counter with the image provid… more
Date: August 13, 1990
Creator: Holley, J.; Silver, E.; Ziock, K.P. (Lawrence Livermore National Lab., CA (USA)); Novick, R.; Kaaret, P. (Columbia Univ., New York, NY (USA). Columbia Astrophysics Lab.); Weisskopf, M. et al.
Partner: UNT Libraries Government Documents Department
open access

[The Dallas Morning News articles, June 13, 1994]

Description: An article clipping from The Dallas Morning News article 'A rosier picture' written by Larry Bleiberg. The piece covers the planned rebuilding of the Dallas ISD fine arts program through several years of revamped funding and building up of curriculum.
Date: June 13, 1994
Creator: Bleiberg, Larry
Partner: UNT Libraries Special Collections
open access

Exploring phase space concepts in the forecasting of time series with artificial neural networks

Description: The authors study the performance of feedforward artificial neural networks in forecasting future values of several different time series. They explore both short- and long-term prediction of several periodic time series. They find that a significant source of error in long-term prediction of time series is introduced by a phase shift between the network output and the time series. They explore the origin of this phase shift and suggest strategies for minimizing its effect. They find that the p… more
Date: September 13, 1993
Creator: Rogers, R. D. & Vemuri, V.
Partner: UNT Libraries Government Documents Department
open access

Symplectic methods in circular accelerators

Description: By now symplectic integration has been applied to many problems in classical mechanics. It is my conviction that the field of particle simulation in circular rings is ideally suited for the application of symplectic integration. In this paper, I present a short description symplectic tools in circular storage rings.
Date: January 13, 1994
Creator: Forest, E.
Partner: UNT Libraries Government Documents Department
open access

Behavior of TPC`s in a high particle flux environment

Description: TPC`s (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed.
Date: December 13, 1991
Creator: Etkin, A.; Eisemann, S. E.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S.; Love, W. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Nuclear structure calculations for astrophysical applications

Description: Here we present calculated results on such diverse properties as nuclear energy levels, ground-state masses and shapes, {beta}-decay properties and fission-barrier heights. Our approach to these calculations is to use a unified theoretical framework within which the above properties can all be studied. The results are obtained in the macroscopic-microscopic approach in which a microscopic nuclear-structure single-particle model with extensions is combined with a macroscopic model, such as the l… more
Date: March 13, 1992
Creator: Moeller, P.; Kratz, K. L. & Nix, J. R.
Partner: UNT Libraries Government Documents Department
open access

The NO to NO{sub 2} conversion by ethylene oxidation

Description: A well-stirred reactor experiment and chemical kinetic modeling effort were performed in order to study the effect of ethylene oxidation on the conversion of nitric oxide (NO) to nitrogen dioxide (NO{sub 2}). Parameters examined in this study were temperature (1003--1260K) and input hydrocarbon concentration (220--3270 ppmv wet). The stirred reactor residence time was maintained at {approximately}2 milliseconds. Kinetic calculations indicated the NO to NO{sub 2} conversion proceeded through the… more
Date: May 13, 1994
Creator: Marinov, N. M.; Steele, R. C.; Malte, P. C. & Hori, M.
Partner: UNT Libraries Government Documents Department
open access

Burst mode FEL with the ETA-III induction linac

Description: Pulses of 140 GHz microwaves have been produced at a 2 kHz rate using the ETA-III induction linac and IMP wiggler. The accelerator was run in bursts of up to 50 pulses at 6 MeV and greater than 2 kA peak current. A feedback timing control system was used to synchronize acceleration voltage pulses with the electron beam, resulting in sufficient reduction of the corkscrew and energy sweep for efficient FEL operation. Peak microwave power for short bursts was in the range 0.5--1.1 GW, which is com… more
Date: May 13, 1993
Creator: Lasnier, C. J.; Allen, S. L. & Felker, B.
Partner: UNT Libraries Government Documents Department
open access

Refining a triangulation of a planar straight-line graph to eliminate large angles

Description: Triangulations without large angles have a number of applications in numerical analysis and computer graphics. In particular, the convergence of a finite element calculation depends on the largest angle of the triangulation. Also, the running time of a finite element calculation is dependent on the triangulation size, so having a triangulation with few Steiner points is also important. Bern, Dobkin and Eppstein pose as an open problem the existence of an algorithm to triangulate a planar straig… more
Date: May 13, 1993
Creator: Mitchell, S. A.
Partner: UNT Libraries Government Documents Department
open access

The integration of mind into physics

Description: The proper goal of science is a unified theory of all of nature, including our thoughts. An adequate theory of this kind will resolve the quantum measurement problem, which is to reconcile the nonclassical character of the quantum world with the classical character of our perceptions of it. A framework for such a theory is described. It weds the opposing views of Bohr and Einstein. Bohr held that quantum theory provides rules that relate aspects of our knowledge, while Einstein claimed that bas… more
Date: July 13, 1994
Creator: Stapp, H. P.
Partner: UNT Libraries Government Documents Department
open access

A time-frequency smoothing algorithm for cyclic spectral analysis

Description: A hybrid smoothing algorithm is described that smooths first in time and then in frequency. The time-frequency smoothing algorithm is designed to compute estimates of the cyclic (cross) spectrum along lines of constant cycle frequency. A variation on the algorithm, one that incorporates the One Bit Spectral Correlation Algorithm (OBSCA), is also described. A simulation study is presented that evaluates the algorithms.
Date: August 13, 1992
Creator: Roberts, R. S.
Partner: UNT Libraries Government Documents Department
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