Observation of Supernova Remnant IC 443 with the Fermi Large Area Telescope (open access)

Observation of Supernova Remnant IC 443 with the Fermi Large Area Telescope

None
Date: December 14, 2012
Creator: Abdo, A. A.
Object Type: Report
System: The UNT Digital Library
Corrosion testing of stainless steel-zirconium metal waste form. (open access)

Corrosion testing of stainless steel-zirconium metal waste form.

Stainless steel-zirconium (SS-Zr) alloys are being considered as waste forms for the disposition of metallic waste generated during the electrometallurgical treatment of spent nuclear fuel. The waste forms contain irradiated cladding hulls, components of the alloy fuel, noble metal fission products, and actinide elements. The baseline waste form is a stainless steel-15 wt% zirconium (SS-15Zr) alloy. This article presents microstructure and some of the corrosion studies being conducted on the waste form alloys. Electrochemical corrosion, immersion corrosion, and vapor hydration tests have been performed on various alloy compositions to evaluate corrosion behavior and resistance to selective leaching of simulated fission products. The SS-Zr waste forms are successful at the immobilization and retention of fission products and show potential for acceptance as high-level nuclear waste forms.
Date: December 14, 1998
Creator: Abraham, D. P.
Object Type: Article
System: The UNT Digital Library
Electrochemical corrosion testing of metal waste forms (open access)

Electrochemical corrosion testing of metal waste forms

Electrochemical corrosion tests have been conducted on simulated stainless steel-zirconium (SS-Zr) metal waste form (MWF) samples. The uniform aqueous corrosion behavior of the samples in various test solutions was measured by the polarization resistance technique. The data show that the MWF corrosion rates are very low in groundwaters representative of the proposed Yucca Mountain repository. Galvanic corrosion measurements were also conducted on MWF samples that were coupled to an alloy that has been proposed for the inner lining of the high-level nuclear waste container. The experiments show that the steady-state galvanic corrosion currents are small. Galvanic corrosion will, hence, not be an important mechanism of radionuclide release from the MWF alloys.
Date: December 14, 1999
Creator: Abraham, D. P.; Peterson, J. J.; Katyal, H. K.; Keiser, D. D. & Hilton, B. A.
Object Type: Article
System: The UNT Digital Library
Model Etch Profiles for Ion Energy Distribution Functions in an Inductively Coupled Plasma Reactor (open access)

Model Etch Profiles for Ion Energy Distribution Functions in an Inductively Coupled Plasma Reactor

Rectangular trench profiles are modeled with analytic etch rates determined from measured ion distribution functions. The pattern transfer step for this plasma etch is for trilayer lithography. Argon and chlorine angular ion energy distribution functions measured by a spherical collector ring analyzer are fit to a sum of drifting Maxwellian velocity distribution functions with anisotropic temperatures. The fit of the model ion distribution functions by a simulated annealing optimization procedure converges adequately for only two drifting Maxwellians. The etch rates are proportional to analytic expressions for the ion energy flux. Numerical computation of the etch profiles by integration of the characteristic equations for profile points and connection of the profiles points is efficient.
Date: December 14, 1998
Creator: Abraham-Shrauner, B.; Chen, W. & Woodworth, J.R.
Object Type: Article
System: The UNT Digital Library
Supreme Court: Church-State Cases, October 1983 Term (open access)

Supreme Court: Church-State Cases, October 1983 Term

This report provides an assessment of Supreme Court cases from the 1983-85 Term that involve issues involving the free exercise of religion. It provides a detailed review of the case Lynch v. Donnelly, and brief descriptions of twelve other cases that have not been reviewed.
Date: December 14, 1983
Creator: Ackerman, David M.
Object Type: Report
System: The UNT Digital Library
Assessing Terrorist Motivations for Attacking Critical "Chemical" Infrastructure (open access)

Assessing Terrorist Motivations for Attacking Critical "Chemical" Infrastructure

Certain types of infrastructure--critical infrastructure (CI)--play vital roles in underpinning our economy, security, and way of life. One particular type of CI--that relating to chemicals--constitutes both an important element of our nation's infrastructure and a particularly attractive set of potential targets. This is primarily because of the large quantities of toxic industrial chemicals (TICs) it employs in various operations and because of the essential economic functions it serves. This study attempts to minimize some of the ambiguities that presently impede chemical infrastructure threat assessments by providing new insight into the key motivational factors that affect terrorist organizations propensity to attack chemical facilities. Prepared as a companion piece to the Center for Nonproliferation Studies August 2004 study--''Assessing Terrorist Motivations for Attacking Critical Infrastructure''--it investigates three overarching research questions: (1) why do terrorists choose to attack chemical-related infrastructure over other targets; (2) what specific factors influence their target selection decisions concerning chemical facilities; and (3) which, if any, types of groups are most inclined to attack chemical infrastructure targets? The study involved a multi-pronged research design, which made use of four discrete investigative techniques to answer the above questions as comprehensively as possible. These include: (1) a review of terrorism and threat …
Date: December 14, 2004
Creator: Ackerman, G.; Bale, J. & Moran, K.
Object Type: Report
System: The UNT Digital Library
Constraints on Dark Matter Annihilation in Clusters of Galaxies with the Fermi Large Area Telescope (open access)

Constraints on Dark Matter Annihilation in Clusters of Galaxies with the Fermi Large Area Telescope

None
Date: December 14, 2012
Creator: Ackermann, M.; Ajello, M.; Allafort, A.; Baldini, L.; Ballet, J.; Barbiellini, G. et al.
Object Type: Article
System: The UNT Digital Library
Top physics: search for anomalous kinematics in t anti-t dilepton events at cdf ii (open access)

Top physics: search for anomalous kinematics in t anti-t dilepton events at cdf ii

We report on a search for anomalous kinematics of t{bar t} dilepton events in p{bar p} collisions at {radical}s = 1.96 TeV using 193 pb{sup -1} of data collected with the CDF II detector. We developed a new a priori technique designed to isolate the subset in a data sample revealing the largest deviation from standard model (SM) expectations and to quantify the significance of this departure. In the four-variable space considered, no particular subset shows a significant discrepancy and we find that the probability of obtaining a data sample less consistent with the SM than what is observed is 1.0-4.5%.
Date: December 14, 2004
Creator: Acosta, D.
Object Type: Report
System: The UNT Digital Library
Automatic Signal System (open access)

Automatic Signal System

Patent for an automatic signal system for use with railways. Illustrations included.
Date: December 14, 1909
Creator: Adams, Powell O.
Object Type: Patent
System: The Portal to Texas History
Ash & Pulverized Coal Deposition in Combustors & Gasifiers (open access)

Ash & Pulverized Coal Deposition in Combustors & Gasifiers

Gravity- driven granular flow of slightly frictional particles down an inclined, bumpy chute is studied. A modified kinetic model which includes the frictional energy loss effects is used, and the boundary conditions for a bumpy wall with small friction are derived by ensuring the balance of momentum and energy. At the free surface, the condition of vanishing of the solid volume fraction is used. The mean velocity, the fluctuation kinetic energy and the solid volume fraction profiles are evaluated. It is shown that steady granular gravity flow down a bumpy frictional chute could be achieved at arbitrary inclination angles. The computational results also show that the slip velocity may vary considerably depending on the granular layer height, the surface boundary roughness, the fric-tion coefficient and the inclination angles. The model predictions are compared with the existing experimental and simulation data, and good agreement is observed. In particular, the model can well predicate the features of the variation of solid volume fraction and fluctuation energy profiles for different particle- wall friction coeffi-cients and wall roughnesses.
Date: December 14, 1998
Creator: Ahamadi, Goodarz
Object Type: Report
System: The UNT Digital Library
Nuclear Data Project Evaluation Activity Report (open access)

Nuclear Data Project Evaluation Activity Report

This report summarizes the activities of the ORNL Nuclear Data Project since the IAEA Advisory Group meeting in October 1996. The group's future plans are also included.
Date: December 14, 1998
Creator: Akovali, Y. A.; Artna-Cohen, A.; Blackmon, J. C.; Radford, D.; Smith, M. S. & Yu, C. H.
Object Type: Article
System: The UNT Digital Library
GUIDELINES FOR MIXING AND PLACING THERMALLY CONDUCTIVE CEMENTITIOUS GROUT (MIX 111). (open access)

GUIDELINES FOR MIXING AND PLACING THERMALLY CONDUCTIVE CEMENTITIOUS GROUT (MIX 111).

None
Date: December 14, 1999
Creator: Allan, M. L.
Object Type: Report
System: The UNT Digital Library
Erratum: High power impulse magnetron sputtering:Current-voltage-time characteristics indicate the onset of sustainedself-sputtering (open access)

Erratum: High power impulse magnetron sputtering:Current-voltage-time characteristics indicate the onset of sustainedself-sputtering

None
Date: December 14, 2007
Creator: Anders, Andre; Andersson, Joakim & Ehiasarian, Arutiun
Object Type: Article
System: The UNT Digital Library
Ion charge state fluctuations in vacuum arcs (open access)

Ion charge state fluctuations in vacuum arcs

Ion charge state distributions of cathodic vacuum arcs have been investigated using a modified time-of-flight method. Experiments have been done in double gate and burst gate mode, allowing us to study both systematic and stochastic changes of ion charge state distributions with a time resolution down to 100 ns. In the double gate method, two ion charge spectra are recorded with a well-defined time between measurements. The elements Mg, Bi, and Cu were selected for tests, representing metals of very different properties. For all elements it was found that large stochastic changes occur even at the limit of resolution. This is in agreement with fast changing arc properties observed elsewhere. Correlation of results for short times between measurements was found but it is argued that this is due to velocity mixing rather than due to cathode processes. The burst mode of time-of-flight measurements revealed the systematic time evolution of ion charge states within a single arc discharge, as opposed to previous measurements that relied on data averaged over many pulses. The technique shows the decay of the mean ion charge state as well as the level of material-dependent fluctuations.
Date: December 14, 2004
Creator: Anders, Andre; Fukuda, Kentaro & Yushkov, Georgy Yu
Object Type: Article
System: The UNT Digital Library
Alpha Fuels Environmental Test Facility impact gun (open access)

Alpha Fuels Environmental Test Facility impact gun

The Alpha Fuels Environmental Test Facility (AFETF) impact gun is a unique tool for impact testing /sup 238/PuO/sub 2/-fueled heat sources of up to 178-mm dia at velocities to 300 m/s. An environmentally-sealed vacuum chamber at the muzzle of the gun allows preheating of the projectile to 1,000/sup 0/C. Immediately prior to impact, the heat source projectile is completely sealed in a vacuum-tight catching container to prevent escape of its radioactive contents should rupture occur. The impact velocity delivered by this gas-powered gun can be regulated to within +-2%.
Date: December 14, 1978
Creator: Anderson, C.G.
Object Type: Report
System: The UNT Digital Library

DOE Webinar - Residential Geothermal Heat Pump Retrofits

This presentation was given December 14, 2010, as part of DOE's Webinar series. The presentation discusses geothermal heat pump retrofits, technology options, and an overview of geothermal energy and geothermal heat pumps.
Date: December 14, 2010
Creator: Anderson, E. R.
Object Type: Presentation
System: The UNT Digital Library
Combustion Apparatus (open access)

Combustion Apparatus

Patent for a combustion apparatus that will maximize the heat produced with any given amount of fuel.
Date: December 14, 1920
Creator: Anderson, Robert James
Object Type: Patent
System: The Portal to Texas History
Multiscale framework for predicting the coupling between deformation and fluid diffusion in porous rocks (open access)

Multiscale framework for predicting the coupling between deformation and fluid diffusion in porous rocks

In this project, a predictive multiscale framework will be developed to simulate the strong coupling between solid deformations and fluid diffusion in porous rocks. We intend to improve macroscale modeling by incorporating fundamental physical modeling at the microscale in a computationally efficient way. This is an essential step toward further developments in multiphysics modeling, linking hydraulic, thermal, chemical, and geomechanical processes. This research will focus on areas where severe deformations are observed, such as deformation bands, where classical phenomenology breaks down. Multiscale geometric complexities and key geomechanical and hydraulic attributes of deformation bands (e.g., grain sliding and crushing, and pore collapse, causing interstitial fluid expulsion under saturated conditions), can significantly affect the constitutive response of the skeleton and the intrinsic permeability. Discrete mechanics (DEM) and the lattice Boltzmann method (LBM) will be used to probe the microstructure---under the current state---to extract the evolution of macroscopic constitutive parameters and the permeability tensor. These evolving macroscopic constitutive parameters are then directly used in continuum scale predictions using the finite element method (FEM) accounting for the coupled solid deformation and fluid diffusion. A particularly valuable aspect of this research is the thorough quantitative verification and validation program at different scales. The multiscale homogenization …
Date: December 14, 2012
Creator: Andrade, José E & Rudnicki, John W
Object Type: Report
System: The UNT Digital Library
GAP Final Technical Report 12-14-04 (open access)

GAP Final Technical Report 12-14-04

The Genomics Annotation Platform (GAP) was designed to develop new tools for high throughput functional annotation and characterization of protein sequences and structures resulting from genomics and structural proteomics, benchmarking and application of those tools. Furthermore, this platform integrated the genomic scale sequence and structural analysis and prediction tools with the advanced structure prediction and bioinformatics environment of ICM. The development of GAP was primarily oriented towards the annotation of new biomolecular structures using both structural and sequence data. Even though the amount of protein X-ray crystal data is growing exponentially, the volume of sequence data is growing even more rapidly. This trend was exploited by leveraging the wealth of sequence data to provide functional annotation for protein structures. The additional information provided by GAP is expected to assist the majority of the commercial users of ICM, who are involved in drug discovery, in identifying promising drug targets as well in devising strategies for the rational design of therapeutics directed at the protein of interest. The GAP also provided valuable tools for biochemistry education, and structural genomics centers. In addition, GAP incorporates many novel prediction and analysis methods not available in other molecular modeling packages. This development led to signing …
Date: December 14, 2004
Creator: Andrew J. Bordner, PhD, Senior Research Scientist
Object Type: Report
System: The UNT Digital Library
Electron beam related manufacturing technology development at Lawrence Livermore National Laboratory (open access)

Electron beam related manufacturing technology development at Lawrence Livermore National Laboratory

In the defense community, certain uranium-alloy components have been manufactured by methods which generate large quantities of uranium bearing waste. Our estimates show that these components can be fabricated by vapor deposition and reduce waste generation by more than an order of magnitude. We present results from a series of uranium-alloy vapor deposition tests designed to produce samples of free-standing structures. Both flat plate and cylindrical shells were produced. The deposits were fully dense, defect free and displayed a high quality surface finish. The uranium-alloy was co-evaporated from a single source. Bulk chemistry specifications for the material were met, although some residual variation in chemistry was observed in sample cross sections. After heat treatment, the vapor deposited samples exhibited tensile properties similar to conventional ingot processed material.
Date: December 14, 1995
Creator: Anklam, T.M.
Object Type: Article
System: The UNT Digital Library
Sawing Machine (open access)

Sawing Machine

Patent for a wood sawing machine which allows for a portable wood sawing apparatus. The device is capable of adjusting the saw to create a feed, and allows for cutting diagonally, horizontally, or vertically.
Date: December 14, 1920
Creator: Arnold, James A.
Object Type: Patent
System: The Portal to Texas History
Solutions of the Reactor Kinetics Equations for Time-Dependent Reactivities (open access)

Solutions of the Reactor Kinetics Equations for Time-Dependent Reactivities

Abstract: The reactor kinetics equations are combined into a single integral equation whose kernel describes the time-dependent characteristics of the reactor including six delayed groups of neutrons. Numerical solutions of the integral equation are given for constant, linear, and ∫sin²kx dx reactivities. An approximate solution of the integral equation is obtained which provides a basis for the formulation and solution of the reactor system control problem using the methods of servomechanisms theory. The reactor frequency response function, a product of the approximate solution, is calculated and plot given.
Date: December 14, 1955
Creator: Ash, Milton S.
Object Type: Report
System: The UNT Digital Library
B meson decays to charmless meson pairs containing eta or eta' (open access)

B meson decays to charmless meson pairs containing eta or eta'

The authors present updated measurements of the branching fractions for B{sup 0} meson decays to {eta}K{sup 0}, {eta}{eta}, {eta}{phi}, {eta}{omega}, {eta}{prime}K{sup 0}, {eta}{prime}{eta}{prime}, {eta}{prime}, {phi}, and {eta}{prime}{omega} and branching fractions and CP-violating charge asymmetries for B{sup +} decays to {eta}{pi}{sup +}, {eta}K{sup +}, {eta}{prime}{pi}{sup +}, and {eta}{prime} K{sup +}. The data represent the full dataset of 467 x 10{sup 6} B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at the SLAC National Accelerator Laboratory. Besides large signals for the four charged B decays modes and for B{sup 0} {yields} {eta}{prime}K{sup 0}, they find evidence for three B{sup 0} decays modes at greater than 3.0{sigma} significance. They find {Beta}(B{sup 0} {yields} {eta}K{sup 0}) = (1.15{sub -0.38}{sup +0.43} {+-} 0.09) x 10{sup -6}, {Beta}(B{sup 0} {yields} {eta}{omega}) = (0.94{sub -0.30}{sup +0.35} {+-} 0.09) x 10{sup -6}, and {Beta}(B{sup 0} {yields} {eta}{prime}{omega}) = (1.01{sub -0.38}{sup +0.46} {+-} 0.09) x 10{sup -6}, where the first (second) uncertainty is statistical (systematic). For the B{sup +} {yields} {eta}K{sup +} decay mode, they measure the charge asymmetry {Alpha}{sub ch} (B{sup +} {yields} {eta}K{sup +}) = -0.36 {+-} 0.11 {+-} 0.03.
Date: December 14, 2009
Creator: Aubert, B.
Object Type: Article
System: The UNT Digital Library
Evidence for the eta_b(1S) in the Decay Upsilon(2S)-> gamma eta_b(1S) (open access)

Evidence for the eta_b(1S) in the Decay Upsilon(2S)-> gamma eta_b(1S)

We have performed a search for the {eta}{sub b}(1S) meson in the radiative decay of the {Upsilon}(2S) resonance using a sample of 91.6 million {Upsilon}(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E{sub {gamma}} = 610.5{sub -4.3}{sup +4.5}(stat) {+-} 1.8(syst) MeV, corresponding to an {eta}{sub b}(1S) mass of 9392.9{sub -4.8}{sup +4.6}(stat) {+-} 1.9(syst) MeV/c{sup 2}. The branching fraction for the decay {Upsilon}(2S) {yields} {gamma}{eta}{sub b}(1S) is determined to be (4.2{sub -1.0}{sup +1.1}(stat) {+-} 0.9(syst)) x 10{sup -4}. The ratio {Beta}({Upsilon}(2S) {yields} {gamma}{eta}{sub b}(1S))/{Beta}({Upsilon}(3S) {yields} {gamma}{eta}{sub b}(1S)) = 0.89{sub -0.23}{sup +0.25}(stat){sub -0.16}{sup +0.12}(syst) is consistent with the ratio expected for magnetic dipole transitions to the {eta}{sub b}(1S) meson.
Date: December 14, 2009
Creator: Aubert, B.; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E. et al.
Object Type: Article
System: The UNT Digital Library