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Field Errors in Hybrid Insertion Devices

Description: Hybrid magnet theory as applied to the error analyses usedin the design of Advanced Light Source (ALS) insertion devices isreviewed. Sources of field errors in hybrid insertion devices arediscussed.
Date: February 3, 1995
Creator: Schlueter, R.D.
Partner: UNT Libraries Government Documents Department
open access

U.S. Department of Energy Consequence Management Under the National Response Framework

Description: Under the Nuclear/Radiological Incident Annex of the National Response Framework, the U.S. Department of Energy (DOE) has specific responsibilities as a coordinating agency and for leading interagency response elements in the Federal Radiological Monitoring and Assessment Center (FRMAC). Emergency response planning focuses on rapidly providing response elements in stages after being notified of a nuclear/radiological incident. The use of Home Teams during the field team deployment period and re… more
Date: February 3, 2009
Creator: Guss, Don Van Etten and Paul
Partner: UNT Libraries Government Documents Department
open access

Plant Mounds as Concentration and Stabilization Agents for Actinide Soil Contaminants in Nevada

Description: Plant mounds or blow-sand mounds are accumulations of soil particles and plant debris around the base of shrubs and are common features in deserts in the southwestern United States. An important factor in their formation is that shrubs create surface roughness that causes wind-suspended particles to be deposited and resist further suspension. Shrub mounds occur in some plant communities on the Nevada Test Site, the Nevada Test and Training Range (NTTR), and Tonopah Test Range (TTR), including a… more
Date: February 3, 2009
Creator: Shafer, D.S. & Gommes, J.
Partner: UNT Libraries Government Documents Department
open access

Accelerator Design Concept for Future Neutrino Facilities

Description: This document summarizes the findings of the Accelerator Working Group (AWG) of the International Scoping Study (ISS) of a Future Neutrino Factory and Superbeam Facility. The work of the group took place at three plenary meetings along with three workshops, and an oral summary report was presented at the NuFact06 workshop held at UC-Irvine in August, 2006. The goal was to reach consensus on a baseline design for a Neutrino Factory complex. One aspect of this endeavor was to examine critically t… more
Date: February 3, 2008
Creator: ISS Accelerator Working Group
Partner: UNT Libraries Government Documents Department
open access

U.S. Department of Energy Consequence Management Under the National Response Framework

Description: Dramatic advances in data management have been made as a result of the Paperless FRMAC initiative, sponsored by the DOE’s Office of Emergency Response (NA-42). The FRMAC (Federal Radiological Monitoring and Assessment Center) is the hub for all radiological monitoring and the production of data products that interpret those measurements in terms of protective action guidelines. As such, very large amounts of data must be quickly assimilated from numerous sources and then widely distributed as g… more
Date: February 3, 2009
Creator: H. Clark, R. Allen, J. Essex, B. Pobanz
Partner: UNT Libraries Government Documents Department
open access

Equation of state of strongly coupled plasma mixtures

Description: Thermodynamic properties of strongly coupled (high density) plasmas of mixtures of light elements have been obtained by Monte Carlo simulations. For an assumed uniform charge background the equation of state of ionic mixtures is a simple extension of the one-component plasma EOS. More realistic electron screening effects are treated in linear response theory and with an appropriate electron dielectric function. Results have been obtained for the ionic pair distribution functions, and for the el… more
Date: February 3, 1984
Creator: DeWitt, H.E.
Partner: UNT Libraries Government Documents Department
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Hybrid simulation codes with application to shocks and upstream waves

Description: Hybrid codes in which part of the plasma is represented as particles and the rest as fluid are discussed. In the past few years such codes with particle ions and massless, fluid electrons have been applied to space plasmas, especially to collisionless shocks. All of these simulation codes are one-dimensional and similar in structure, except for how the field equation are solved. We describe in detail the various approaches that are used (resistive Ohm's law, predictor-corrector, Hamiltonian) an… more
Date: February 3, 1985
Creator: Winske, D.
Partner: UNT Libraries Government Documents Department
open access

Isotopic ratio method for determining uranium contamination

Description: The presence of high concentrations of uranium in the subsurface can be attributed either to contamination from uranium processing activities or to naturally occurring uranium. A mathematical method has been employed to evaluate the isotope ratios from subsurface soils at the Rocky Flats Nuclear Weapons Plant (RFP) and demonstrates conclusively that the soil contains uranium from a natural source and has not been contaminated with enriched uranium resulting from RFP releases. This paper describ… more
Date: February 3, 1994
Creator: Miles, R. E. & Sieben, A. K.
Partner: UNT Libraries Government Documents Department
open access

Reviewers Comments on the 5th Symposium and the Status of Fusion Research 2003

Description: Better to understand the status of fusion research in the year 2003 we will first put the research in its historical context. Fusion power research, now beginning its sixth decade of continuous effort, is unique in the field of scientific research. Unique in its mixture of pure and applied research, unique in its long-term goal and its promise for the future, and unique in the degree that it has been guided and constrained by national and international governmental policy. Though fusion researc… more
Date: February 3, 2005
Creator: Post, R F
Partner: UNT Libraries Government Documents Department
open access

Implicit Occluders

Description: In this paper we propose a novel visibility-culling technique for optimizing the computation and rendering of opaque isosurfaces. Given a continuous scalar field f (x) over a domain D and an isovalue w, our technique exploits the continuity of f to determine conservative visibility bounds implicitly, i.e., without the need for actually computing the isosurface f{sup -1}(w). We generate Implicit Occluders based on the change in sign of f *(x) = f (x)-w, from positive to negative (or vice versa) … more
Date: February 3, 2004
Creator: Pesco, S; Lindstrom, P; Pascucci, V & Silva, C T
Partner: UNT Libraries Government Documents Department
open access

Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress

Description: The mobilization of arsenic was examined in a system where the deposition of iron and arsenic have been substantially modified by large-scale manipulations. This engineering practice was designed to decrease arsenic concentrations in water supplied to the City of Los Angeles. Accomplishing this objective, however, has resulted in significant accumulation of arsenic and iron in the sediments of a reservoir on the Los Angeles Aqueduct. Arsenic and iron are released into the porewater at depth in … more
Date: February 3, 2004
Creator: O'Day, P A; Campbell, K; Dixit, S & Hering, J G
Partner: UNT Libraries Government Documents Department
open access

Properties of Fluid Deuterium under Double-Shock Compression to Several Mbar

Description: The compressibility of fluid deuterium up to several Mbar has been probed using laser-driven shock waves reflected from a quartz anvil. Combining high-precision ({approx} 1 %) shock velocity measurements with the double-shock technique, where differences in equation of state (EOS) models are magnified, has allowed us to accurately discriminate between various theoretical predictions. Our data are consistent with EOS models that show approximately fourfold compression on the principal Hugoniot f… more
Date: February 3, 2004
Creator: Vianello, E; Celliers, P M; Hicks, D G; Boehly, T R; Collins, T B; Moon, S J et al.
Partner: UNT Libraries Government Documents Department
open access

Out-of-Core Compression and Decompression of Large n-Dimensional Scalar Fields

Description: We present a simple method for compressing very large and regularly sampled scalar fields. Our method is particularly attractive when the entire data set does not fit in memory and when the sampling rate is high relative to the feature size of the scalar field in all dimensions. Although we report results for R{sup 3} and R{sup 4} data sets, the proposed approach may be applied to higher dimensions. The method is based on the new Lorenzo predictor, introduced here, which estimates the value of … more
Date: February 3, 2003
Creator: Ibarria, L.; Lindstrom, P.; Rossignac, J. & Szymczak, A.
Partner: UNT Libraries Government Documents Department
open access

2012 MOLECULAR AND IONIC CLUSTERS GORDON RESEARCH CONFERENCE, JANUARY 29 - FEBRUARY 3, 2012

Description: The Gordon Research Conference on 'Molecular and Ionic Clusters' focuses on clusters, which are the initial molecular species found in gases when condensation begins to occur. Condensation can take place solely from molecules interacting with each other, mostly at low temperatures, or when molecules condense around charged particles (electrons, protons, metal cations, molecular ions), producing ion molecule clusters. These clusters provide models for solvation, allow a pristine look at geometri… more
Date: February 3, 2012
Creator: McCoy, Anne
Partner: UNT Libraries Government Documents Department
open access

Micrometeorite Impacts in Beringian Mammoth Tusks and a Bison Skull

Description: We have discovered what appear to be micrometeorites imbedded in seven late Pleistocene Alaskan mammoth tusks and a Siberian bison skull. The micrometeorites apparently shattered on impact leaving 2 to 5 mm hemispherical debris patterns surrounded by carbonized rings. Multiple impacts are observed on only one side of the tusks and skull consistent with the micrometeorites having come from a single direction. The impact sites are strongly magnetic indicating significant iron content. We analyzed… more
Date: February 3, 2010
Creator: Hagstrum, Jonathon T.; Firestone, Richard B; West, Allen; Stefanka, Zsolt & Revay, Zsolt
Partner: UNT Libraries Government Documents Department
open access

Lensless x-ray imaging in reflection geometry

Description: Lensless X-ray imaging techniques such as coherent diffraction imaging and ptychography, and Fourier transform holography can provide time-resolved, diffraction-limited images. Nearly all examples of these techniques have focused on transmission geometry, restricting the samples and reciprocal spaces that can be investigated. We report a lensless X-ray technique developed for imaging in Bragg and small-angle scattering geometries, which may also find application in transmission geometries. We d… more
Date: February 3, 2011
Creator: Roy, S.; Parks, D. H.; Seu, K. A.; Turner, J. J.; Chao, W.; Anderson, E. H. et al.
Partner: UNT Libraries Government Documents Department
open access

The influence of tungsten alloying on the mechanical properties of tantalum

Description: In mechanical tests of tantalum-tungsten alloys with nominal tungsten contents between 0 and 10 wt % for strain rates between 0.000016 and 6800s{sup {minus}1} and temperatures between 77 and 400 K, the addition of tungsten noticeably reduces the strain-rate dependence of the flow stress of tantalum near yield. It also subtly alters the strain-rate behavior of the work hardening, making it more like that of copper, an fcc metal. These effects are reflected in the limiting strains for uniform pla… more
Date: February 3, 1994
Creator: Gourdin, W. H.; Lassila, D. H.; LeBlanc, M. M. & Shields, A. L.
Partner: UNT Libraries Government Documents Department
open access

Alternative pre-mRNA splicing switches modulate gene expression in late erythropoiesis

Description: Differentiating erythroid cells execute a unique gene expression program that insures synthesis of the appropriate proteome at each stage of maturation. Standard expression microarrays provide important insight into erythroid gene expression but cannot detect qualitative changes in transcript structure, mediated by RNA processing, that alter structure and function of encoded proteins. We analyzed stage-specific changes in the late erythroid transcriptome via use of high-resolution microarrays t… more
Date: February 3, 2009
Creator: Yamamoto, Miki L.; Clark, Tyson A.; Gee, Sherry L.; Kang, Jeong-Ah; Schweitzer, Anthony C.; Wickrema, Amittha et al.
Partner: UNT Libraries Government Documents Department
open access

Elements of Successful and Safe Fusion Experiment Operations

Description: A group of fusion safety professionals contribute to a Joint Working Group (JWG) that performs occupational safety walkthroughs of US and Japanese fusion experiments on a routine basis to enhance the safety of visiting researchers. The most recent walkthrough was completed in Japan in March 2008 by the US Safety Monitor team. This paper gives the general conclusions on fusion facility personnel safety that can be drawn from the series of walkthroughs.
Date: February 3, 2009
Creator: Rule, K.; Cadwallader, L.; Takase, Y.; Norimatsu, T.; Kaneko, O.; Sato, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Analysis of Trade-Off Between Power Saving and Response Time in Disk Storage Systems

Description: It is anticipated that in the near future disk storage systems will surpass application servers and will become the primary consumer of power in the data centers. Shutting down of inactive disks is one of the more widespread solutions to save power consumption of disk systems. This solution involves spinning down or completely shutting off disks that exhibit long periods of inactivity and placing them in standby mode. A file request from a disk in standby mode will incur an I/O cost penalty as … more
Date: February 3, 2009
Creator: Otoo, Ekow J; Rotem, Doron & Tsao, Shih-Chiang
Partner: UNT Libraries Government Documents Department
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Measurements and Simulations of Ultra-Low Emittance and Ultra-Short Electron Beams in the Linac Coherent Light Source

Description: The Linac Coherent Light Source (LCLS) is an x-ray Free-Electron Laser (FEL) project presently in a commissioning phase at SLAC. We report here on very low emittance measurements made at low bunch charge, and a few femtosecond bunch length produced by the LCLS bunch compressors. Start-to-end simulations associated with these beam parameters show the possibilities of generating hundreds of GW at 1.5 {angstrom} x-ray wavelength and nearly a single longitudinally spike at 1.5 nm with 2-fs duration. more
Date: February 3, 2009
Creator: Ding, Y.; Brachmann, A.; Decker, F. J.; Dowell, D.; Emma, P.; Frisch, J. et al.
Partner: UNT Libraries Government Documents Department
open access

RAPID SEPARATION METHOD FOR ACTINIDES IN EMERGENCY AIR FILTER SAMPLES

Description: A new rapid method for the determination of actinides and strontium in air filter samples has been developed at the Savannah River Site Environmental Lab (Aiken, SC, USA) that can be used in emergency response situations. The actinides and strontium in air filter method utilizes a rapid acid digestion method and a streamlined column separation process with stacked TEVA, TRU and Sr Resin cartridges. Vacuum box technology and rapid flow rates are used to reduce analytical time. Alpha emitters are… more
Date: February 3, 2010
Creator: Maxwell, S.; Noyes, G. & Culligan, B.
Partner: UNT Libraries Government Documents Department
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