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Holdup measurement for nuclear fuel manufacturing plants

Description: The assay of nuclear material holdup in fuel manufacturing plants is a laborious but often necessary part of completing the material balance. A range of instruments, standards, and a methodology for assaying holdup has been developed. The objectives of holdup measurement are ascertaining the amount, distribution, and how firmly fixed the SNM is. The purposes are reconciliation of material unbalance during or after a manufacturing campaign or plant decommissioning, to decide security requirement… more
Date: July 13, 1981
Creator: Zucker, M.S.; Degen, M.; Cohen, I.; Gody, A.; Summers, R.; Bisset, P. et al.
Partner: UNT Libraries Government Documents Department
open access

SATB1 tethers multiple gene loci to reprogram expression profiledriving breast cancer metastasis

Description: Global changes in gene expression occur during tumor progression, as indicated by expression profiling of metastatic tumors. How this occurs is poorly understood. SATB1 functions as a genome organizer by folding chromatin via tethering multiple genomic loci and recruiting chromatin remodeling enzymes to regulate chromatin structure and expression of a large number of genes. Here we show that SATB1 is expressed at high levels in aggressive breast cancer cells, and is undetectable in non-malignan… more
Date: July 13, 2006
Creator: Han, Hye-Jung; Kohwi, Yoshinori & Kohwi-Shigematsu, Terumi
Partner: UNT Libraries Government Documents Department
open access

Transmission Electron Microscopy Study of InN Nanorods

Description: InN nanorods were grown on a, c-, and r-plane of sapphire and also on Si (111) and GaN (0001) by non-catalytic, template-free hydride metal-organic vapor phase epitaxy and studied by transmission electron microscopy, electron energy loss (EELS) and photoluminescence (PL) at room temperature. These nanocrystals have different shapes and different faceting depending on the substrate used and their crystallographic orientation. EELS measurements have confirmed the high purity of these crystals. Th… more
Date: July 13, 2006
Creator: Liliental-Weber, Z.; Li, X.; Kryliouk, Olga; Park, H.J.; Mangum,J. & Anderson, T.
Partner: UNT Libraries Government Documents Department
open access

MARKOV Model Application to Proliferation Risk Reduction of an Advanced Nuclear System

Description: The Generation IV International Forum (GIF) emphasizes proliferation resistance and physical protection (PR&PP) as a main goal for future nuclear energy systems. The GIF PR&PP Working Group has developed a methodology for the evaluation of these systems. As an application of the methodology, Markov model has been developed for the evaluation of proliferation resistance and is demonstrated for a hypothetical Example Sodium Fast Reactor (ESFR) system. This paper presents the case of diver… more
Date: July 13, 2008
Creator: Bari, R. A.
Partner: UNT Libraries Government Documents Department
open access

Incorporation of aqueous reaction kinetics and biodegradation intoTOUGHREACT: Application of a multi-region model to hydrobiogeoChemicaltransport of denitrification and sulfate reduction

Description: The need to consider aqueous and sorption kinetics andmicrobiological processes arises in many subsurface problems. Ageneral-rate expression has been implemented into the TOUGHREACTsimulator, which considers multiple mechanisms (pathways) and includesmultiple product, Monod, and inhibition terms. This paper presents aformulation for incorporating kinetic rates among primary species intomass-balance equations. The space discretization used is based on aflexible integral finite difference approac… more
Date: July 13, 2006
Creator: Xu, Tianfu
Partner: UNT Libraries Government Documents Department
open access

The U.S. Support Program to IAEA Safeguards - Destructive Analysis

Description: The U.S. Support Program (USSP) to IAEA Safeguards priority of destructive analysis is aimed at strengthening the IAEA's ability to use destructive analysis as a safeguards tool. IAEA inspectors bring back nuclear and environmental samples from inspections, which are first cataloged by the IAEA and then analyzed by a network of laboratories located in many Member States and the IAEA's own Safeguards Analytical Laboratory in Seibersdorf, Austria. Historically, the USSP was instrumental in introd… more
Date: July 13, 2008
Creator: Hoffheins,B.
Partner: UNT Libraries Government Documents Department
open access

Product Quality Assurance for Off-Grid Lighting in Africa

Description: Although the emergence of markets for high efficiency off-grid lighting technologies holds promise, realizing the potential of this opportunity on a long-term, sustainable basis requires careful attention to issues of product quality, consumer protection, and the potential for significant 'market spoiling', in anticipation of increases of sales of low cost, low performance off-grid lighting products. The goal of the Lighting Africa quality assurance workshop was to articulate strategies to miti… more
Date: July 13, 2008
Creator: Bank, World; Mills, Evan & Mills, Evan
Partner: UNT Libraries Government Documents Department
open access

Unexpected Cancellations in Gravity Theories

Description: Recent computations of scattering amplitudes show that N = 8 supergravity is surprisingly well behaved in the ultraviolet and may even be ultraviolet finite in perturbation theory. The novel cancellations necessary for ultraviolet finiteness first appear at one loop in the guise of the ''no-triangle hypothesis''. We study one-loop amplitudes in pure Einstein gravity and point out the existence of cancellations similar to those found previously in N = 8 supergravity. These cancellations go beyon… more
Date: July 13, 2007
Creator: Bern, Z.; Carrasco, J.J.; /UCLA; Forde, D.; /SLAC, /UCLA; Ita, H. et al.
Partner: UNT Libraries Government Documents Department
open access

Theory and Simulation of Warm Dense Matter Targets

Description: We present simulations and analysis of the heating of warm dense matter foils by ion beams with ion energy less than one MeV per nucleon to target temperatures of order one eV. Simulations were carried out using the multi-physics radiation hydrodynamics code HYDRA and comparisons are made with analysis and the code DPC. We simulate possible targets for a proposed experiment at LBNL (the so-called Neutralized Drift Compression Experiment, NDCXII) for studies of warm dense matter. We compare the … more
Date: July 13, 2006
Creator: Barnard, J. J.; Armijo, J.; More, R. M.; Friedman, A.; Kaganovich, I.; Logan, B. G. et al.
Partner: UNT Libraries Government Documents Department
open access

Integrated Global Nuclear Materials Management - Preliminary Concepts -

Description: Approach to Connect Global Objectives and Local Actions: (1) Articulate global objectives into a hierarchy of subsystem requirements and local attributes and measures; (2) Establish a baseline system and viable alternatives through the interactions and relationships (e.g., networks) of local system elements and their options; (3) Evaluate performance of system alternatives and develop improved nuclear material management strategies and technologies; and (4) The need to address greatest concerns… more
Date: July 13, 2006
Creator: Dreicer, M; Jones, E & Richardson, J
Partner: UNT Libraries Government Documents Department
open access

DHS Regional Reachback: Rapid Expert Radiation Alarm Assistance.

Description: Following assessments that attacks with radiological and nuclear weapons are possible, detection system deployments are being supported at national and local levels. Detection systems include both, highly sensitive but non-discriminating detectors, as well as detectors and algorithms capable of distinguishing and identifying gamma rays by energy. The latter systems, usually handheld systems based on sodium iodide detectors, also provide analysis of the specific radionuclides present and are ref… more
Date: July 13, 2008
Creator: Bowerman, B.; Archer, D.; Young, J.; Monetti, M. & Savage, B.
Partner: UNT Libraries Government Documents Department
open access

Drosophila by the dozen

Description: This year's conference on Drosophila research illustratedwell the current focus of Drosophila genomics on the comprehensiveidentification of functional elements in the genome sequence, includingmRNA transcripts arising from multiple alternative start sites and splicesites, a multiplicity of noncoding transcripts and small RNAs,identification of binding sites for transcription factors, sequenceconservation in related species and sequence variation within species.Resources and technologies for ge… more
Date: July 13, 2007
Creator: Celniker, Susan E. & Hoskins, Roger A.
Partner: UNT Libraries Government Documents Department
open access

Nuclear Energy Readiness Indicator Index (NERI): A benchmarking tool for assessing nuclear capacity in developing countries

Description: Declining natural resources, rising oil prices, looming climate change and the introduction of nuclear energy partnerships, such as GNEP, have reinvigorated global interest in nuclear energy. The convergence of such issues has prompted countries to move ahead quickly to deal with the challenges that lie ahead. However, developing countries, in particular, often lack the domestic infrastructure and public support needed to implement a nuclear energy program in a safe, secure, and nonproliferatio… more
Date: July 13, 2008
Creator: Saum-Manning, L.
Partner: UNT Libraries Government Documents Department
open access

The U.S. Support Program to IAEA Safeguards - How It Works

Description: The U.S. Support Program to International Atomic Energy Agency (IAEA) Safeguards (USSP) was established in 1977 to transfer US technology and expertise to assist the IAEA Department of Safeguards because its limited budget and scope would not allow for R&D activities and the procurement of specialized or customized equipment. Over the years, the USSP and the Department of Safeguards have worked together continuously to develop and improve processes for requesting, selecting, and managing pr… more
Date: July 13, 2008
Creator: Nock,C. & Hoffheins,B.
Partner: UNT Libraries Government Documents Department
open access

Free-surface velocity measurements of plates driven by reacting and detonating RX-03-BB and PBX-0404

Description: Copper plates 90 mm in diameter, of thickness 0.25 mm and 0.5 mm, were accelerated by an adjacent 17 mm thick cylinder of RX-03-BB or PBX-9404-03. The explosive was initiated by impact of a thick flyer from the LLNL 102 mm gun, providing either a reactive or fully detonating wave, by appropriate choice of flyer velocities up to 1.30 mm/..mu..s. The free surface velocity of the plates were measured with a Fabry-Perot velocimeter. Excellent experimental free-surface velocity histories have been o… more
Date: July 13, 1981
Creator: Erickson, L. M.; Palmer, H. G.; Parker, N. L. & Vantine, H. C.
Partner: UNT Libraries Government Documents Department
open access

Investigation of ecosystems impacts from geothermal development in Imperial Valley, California

Description: A summary of three years of field ecological investigation in Imperial Valley Environmental Program is presented. The potential terrestrial habitat impacts of geothermal development are discussed for shorebirds and waterfowl habitat, the endangered clapper rail, powerline corridors, noise effects, animal trace element burdens, and the desert community. Aquatic habitats are discussed in terms of Salton Sea salinity, effects of geothermal brine discharges to the Salton Sea, trace element baseline… more
Date: July 13, 1979
Creator: Shinn, J.H.; Ireland, R.R.; Kercher, J.R.; Koranda, J.J. & Tompkins, G.A.
Partner: UNT Libraries Government Documents Department
open access

Prospects for generating 1-10 TPa pressures with a railgun

Description: It has been demonstrated that a plasma arc can be accelerated along two current carrying parallel rails and used to accelerate a projectile. We have performed an extensive analysis and found the task of using a railgun to accelerate an impactor plate to velocities of 10 to 40 km/s to be feasible with contemporary technology. This range of impact velocities would enable shock pressures of 1 to 10 TPa to be generated for EOS research.
Date: July 13, 1979
Creator: Hawke, R. S. & Scudder, J. K.
Partner: UNT Libraries Government Documents Department
open access

Latch-up control in CMOS integrated circuits

Description: The potential for latch-up, a pnpn self-sustaining low impedance state, is inherent in standard bulk CMOS-integrated circuit structures. Under normal bias, the parasitic SCR is in its blocking state but, if subjected to a large voltage spike or if exposed to an ionizing environment, triggering may occur. This may result in device burn-out or loss of state. The problem has been extensively studied for space and weapons applications. Prevention of latch-up has been achieved in conservative design… more
Date: July 13, 1979
Creator: Ochoa, A.; Dawes, W.; Estreich, D. & Packard, H.
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

Detonation E. O. S. patterns for several explosives

Description: The available overdriven shockwave data for a number of explosives have been analyzed and compared. The data follow neither a constant gamma pattern nor the JWL EOS that fits expansion data to high accuracy. Modifications of the JWL function are proposed to correct for discrepancies and also to allow for the appropriate volume dependence of the Grueneisen constant indicated by previous and more recent work. The deviations from the JWL form of the equation of state appear directly above the CJ p… more
Date: July 13, 1983
Creator: Green, L.; Lee, E.L.; Mitchell, A.C.; Ree, F.; Tipton, R. & van Thiel, M.
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

Crystalline silicon processing

Description: This presentation (consisting of vugraphs) first provides the background motivation for Sandia`s effort for the development of improved crystalline silicon solar cells. It then discusses specific results and progress, and concludes with a brief discussion of options for next year.
Date: July 13, 1994
Creator: Basore, P. A.
Partner: UNT Libraries Government Documents Department
open access

Surrogate Nuclear Reactions and the Origin of the Heavy Elements

Description: An innovative method for indirectly determining reaction cross sections via Surrogate Nuclear Reactions is presented. Exploring indirect approaches for obtaining reaction cross sections is important since a large number of nuclear reactions relevant to astrophysics cannot be measured with currently available techniques. A program is outlined for developing a comprehensive framework for planning and interpreting experiments that can yield the cross sections of interest. The applications will foc… more
Date: July 13, 2004
Creator: Escher, J; Ahle, L; Bernstein, L; Church, J; Dietrich, F; Forssen, C et al.
Partner: UNT Libraries Government Documents Department
open access

First Beam Measurements with the LHC Synchrotron Light Monitors

Description: The continuous monitoring of the transverse sizes of the beams in the Large Hadron Collider (LHC) relies on the use of synchrotron radiation and intensified video cameras. Depending on the beam energy, different synchrotron light sources must be used. A dedicated superconducting undulator has been built for low beam energies (450 GeV to 1.5 TeV), while edge and centre radiation from a beam-separation dipole magnet are used respectively for intermediate and high energies (up to 7 TeV). The emitt… more
Date: July 13, 2012
Creator: Lefevre, Thibaut; Bravin, Enrico; Burtin, Gerard; Guerrero, Ana; Jeff, Adam; Rabiller, Aurelie et al.
Partner: UNT Libraries Government Documents Department
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