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Fast Wavefront Reconstruction in Large Adaptive Optics Systems Using the Fourier Transform

Description: Wavefront Reconstruction using the Fast Fourier Transform and spatial filtering is shown to be computationally tractable and sufficiently accurate for use in large Shack Hartmann-based adaptive optics systems (up to at least 10,000 actuators). This method is significantly faster and can have lower noise propagation than traditional VMM reconstructors. The boundary problem which prevented the accurate reconstruction of phase in circular apertures using square-grid FTs is identified and solved. T… more
Date: January 13, 2002
Creator: Poyneer, L; Gravel, D T & Brase, J M
Item Type: Refine your search to only Article
open access

Federal Prison Industries

Description: This report discusses about Impact of UNICOR on the Federal Prison System and Society, Recent Administration Efforts to Reform FPI, Legislative History, Legislation in the 111th Congress and Issues for Congress.
Date: January 13, 2009
Creator: James, Nathan
Item Type: Refine your search to only Report
open access

Federal Register, Volume 74, Number 8, January 13, 2009, Pages 1583-1870

Description: Daily publication of the U.S. Office of the Federal Register contains rules and regulations, proposed legislation and rule changes, and other notices, including "Presidential proclamations and Executive Orders, Federal agency documents having general applicability and legal effect, documents required to be published by act of Congress, and other Federal agency documents of public interest" (p. ii). Table of Contents starts on page iii.
Date: January 13, 2009
Creator: United States. Office of the Federal Register.
Item Type: Refine your search to only Journal/Magazine/Newsletter
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File System Workload Analysis for Large Scale Scientific Computing Applications

Description: Parallel scientific applications require high-performance I/O support from underlying file systems. A comprehensive understanding of the expected workload is therefore essential for the design of high-performance parallel file systems. We re-examine the workload characteristics in parallel computing environments in the light of recent technology advances and new applications. We analyze application traces from a cluster with hundreds of nodes. On average, each application has only one or two ty… more
Date: January 13, 2004
Creator: Wang, Feng; Xin, Qin; Hong, Bo; Brandt, Scott A.; Miller, Ethan L.; Long, Darrell D. E. et al.
Item Type: Refine your search to only Article
open access

Final Report for "Boron and Tin in Nuclear Medicien: The Development of Reactive Solid-State Reagents for PET and SPECT

Description: The research program was directed at the use of functionalized organometallic reagents that would rapidly react with radiolabeled agents generated by a medical cyclotron or reactor. The radioisotopes included fluorine-18, oxgygen-15, nitrogen-13, carbon-11 and iodine-123; all short lived nuclides of importantce in nuclear medicine imaging studies utilizing emission tomography techniques. The early studies led to the development of extensive new isotope incorporation chemistry. These studies val… more
Date: January 13, 2006
Creator: Kabalka, George W.
Item Type: Refine your search to only Report
open access

Financial Market Intervention

Description: This report provides answers to some frequently asked questions concerning ongoing financial disruptions and the Troubled Asset Relief Program, enacted by Congress in the Emergency Economic Stabilization Act of 2008.
Date: January 13, 2009
Creator: Murphy, Edward V. & Webel, Baird
Item Type: Refine your search to only Report
open access

Finite volume corrections to pi pi scattering

Description: Lattice QCD studies of hadron-hadron interactions are performed by computing the energy levels of the system in a finite box. The shifts in energy levels proportional to inverse powers of the volume are related to scattering parameters in a model independent way. In addition, there are non-universal exponentially suppressed corrections that distort this relation. These terms are proportional to e-m{sub pi} L and become relevant as the chiral limit is approached. In this paper we report on a one… more
Date: January 13, 2006
Creator: Sato, Ikuro; Bedaque, Paulo F. & Walker-Loud, Andre
Item Type: Refine your search to only Article
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Fuel Retrieval Sub (FRS) Project Decapping Station Performance Test Data Report

Description: This document is to provide the test data report for Decapping Station Performance Testing. These performance tests were full scale and viewed as a continuation of development testing performed earlier (SNF-2710). A prototype decapping station confinement box was tested, along with some special tools required for the process, providing assurance that the fuel handling equipment will operate as designed, allowing for release of the FRS equipment for installation.
Date: January 13, 2000
Creator: Thielges, J. R.
Item Type: Refine your search to only Report
open access

Gamma-Ray Bursts Shower the Universe with Metals

Description: According to the results from a Livermore computer model, some of the small change jingling in your pocket contains zinc and copper created in massive gamma-ray bursts (GRBs) that rank as the most impressive light shows in the universe. Livermore astrophysicist Jason Pruet and his colleagues Rebecca Surman and Gail McLaughlin from North Carolina State University (NCSU) reported on their calculations in the February 20, 2004, issue of ''Astrophysical Journal Letters''. They found that GRBs from … more
Date: January 13, 2006
Creator: Hazi, A.
Item Type: Refine your search to only Report
open access

Gas Separations using Ceramic Membranes

Description: This project has been oriented toward the development of a commercially viable ceramic membrane for high temperature gas separations. A technically and commercially viable high temperature gas separation membrane and process has been developed under this project. The lab and field tests have demonstrated the operational stability, both performance and material, of the gas separation thin film, deposited upon the ceramic membrane developed. This performance reliability is built upon the ceramic … more
Date: January 13, 2005
Creator: Liu, Paul K. T.
Item Type: Refine your search to only Report
open access

Geologic evaluation of the Oasis Valley basin, Nye County, Nevada

Description: This report documents the results of a geologic study of the area between the underground-nuclear-explosion testing areas on Pahute Mesa, in the northwesternmost part of the Nevada Test Site, and the springs in Oasis Valley, to the west of the Test Site. The new field data described in this report are also presented in a geologic map that is a companion product(Fridrich and others, 1999) and that covers nine 7.5-minute quadrangles centered on Thirsty Canyon SW, the quadrangle in which most of t… more
Date: January 13, 2000
Creator: Fridrich, C. J.; Minor, S. A. & Mankinen, E. A.
Item Type: Refine your search to only Report
open access

Geologic map of the Oasis Valley basin and vicinity, Nye County, Nevada

Description: This map and accompanying cross sections present an updated synthesis of the geologic framework of the Oasis Valley area, a major groundwater discharge site located about 15 km west of the Nevada Test Site. Most of the data presented in this compilation is new geologic map data, as discussed below. In addition, the cross sections incorporate new geophysical data that have become available in the last three years (Grauch and others, 1997; written comm., 1999; Hildenbrand and others, 1999; Mankin… more
Date: January 13, 2000
Creator: Fridrich, C. J.; Minor, S. A.; Ryder, P. L. & Slate, J. L.
Item Type: Refine your search to only Report
open access

Grazing incidence neutron diffraction from large scale 2D structures

Description: The distorted wave Born approximation (DWBA) is applied to evaluate the diffraction pattern of neutrons (or X-rays) from a 2D array of dots deposited onto a dissimilar substrate. With the radiation impinging on the surface at a grazing incidence angle {alpha}, the intensities diffracted both in and out the plane of specular reflection are calculated as a function of the periodicity of the array, height and diameter of the dots. The results are presented in the form of diffracted intensity conto… more
Date: January 13, 2000
Creator: Toperverg, B. P.; Felcher, G. P.; Metlushko, V. V.; Leiner, V.; Siebrecht, R. & Nikonov, O.
Item Type: Refine your search to only Article
open access

Growth rate exponents of Richtmyer-Meshkov mixing layers

Description: The Richtmyer-Meshkov mixing layer is initiated by the passing of a shock over an interface between fluid of differing densities. The energy deposited during the shock passage undergoes a relaxation process during which the fluctuational energy in the flow field decays and the spatial gradients of the flow field decrease in time. This late stage of Richtmyer-Meshkov mixing layers is studied from the viewpoint of self-similarity. Analogies with weakly anisotropic turbulence suggest that both the… more
Date: January 13, 2004
Creator: Zhou, Y & Clark, T
Item Type: Refine your search to only Article
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