33 Matching Results

Search Results

Results: 1 - 24 next
open access

Bureau of the Public Debt: Areas for Improvement in Information Security Controls

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "In connection with fulfilling our requirement to audit the financial statements of the U.S. government, we audited and reported on the Schedules of Federal Debt Managed by the Bureau of the Public Debt (BPD) for the fiscal years ended September 30, 2005 and 2004. As part of these audits, we performed a review of the general and application information security controls over key BPD financial systems. Thi… more
Date: March 16, 2006
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Gas Pipeline Safety: Preliminary Observations on the Integrity Management Program and 7-Year Reassessment Requirement

Description: Testimony issued by the Government Accountability Office with an abstract that begins "About a dozen people are killed or injured in natural gas transmission pipeline incidents each year. In an effort to improve upon this safety record, the Pipeline Safety Improvement Act of 2002 requires that operators assess pipeline segments in about 20,000 miles of highly populated or frequented areas for safety risks, such as corrosion, welding defects, or incorrect operation. Half of these baseline assess… more
Date: March 16, 2006
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Tactical Aircraft: Recapitalization Goals Are Not Supported by Knowledge-Based F-22A and JSF Business Cases

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The Department of Defense's (DOD) F-22A and Joint Strike Fighter (JSF) programs aim to replace many of the Department's aging tactical fighter aircraft--many of which have been in DOD's inventory for more than 20 years. Together, the F-22A and JSF programs represent a significant investment for DOD--currently estimated at almost $320 billion. GAO has reported on the poor outcomes in DOD's acquisitions of tact… more
Date: March 16, 2006
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Information Security: Federal Agencies Show Mixed Progress in Implementing Statutory Requirements

Description: Testimony issued by the Government Accountability Office with an abstract that begins "For many years, GAO has reported that ineffective information security is a widespread problem that has potentially devastating consequences. In its reports to Congress since 1997, GAO has identified information security as a governmentwide high-risk issue--most recently in January 2005. Concerned with accounts of attacks on commercial systems via the Internet and reports of significant weaknesses in federal … more
Date: March 16, 2006
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Effects of WENO flux reconstruction order and spatial resolution on reshocked two-dimensional Richtmyer-Meshkov instability

Description: Finite-difference weighted essentially non-oscillatory (WENO) simulations of the reshocked two-dimensional single-mode Richtmyer-Meshkov instability using third-, fifth- and ninth-order spatial flux reconstruction and uniform spatial grid resolutions corresponding to 128, 256 and 512 points per initial perturbation wavelength are presented. The dependence of the density, vorticity, simulated density Schlieren and baroclinic production fields, mixing layer width, circulation deposition, mixing p… more
Date: March 16, 2006
Creator: Latini, M; Schilling, O & Don, W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New experimental measurements of electron clouds in ion beams with large tune depression

Description: We study electron clouds in high perveance beams (K = 8E-4) with a large tune depression of 0.2 (defined as the ratio of a single particle oscillation response to the applied focusing fields, with and without space charge). These 1 MeV, 180 mA, K+ beams have a beam potential of +2 kV when electron clouds are minimized. Simulation results are discussed in a companion paper [J-L. Vay, this Conference]. We have developed the first diagnostics that quantitatively measure the accumulation of electro… more
Date: March 16, 2006
Creator: Molvik, A W; Covo, M K; Cohen, R H; Friedman, A; Bieniosek, F M; Leister, C M et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the effects of various culture condition on Cr (VI) reduction by Shewanella oneidensis MR-1 in a novel high-throughputmini-bioreactor

Description: The growth and Cr(VI) reduction by Shewanella oneidensisMR-1 was examined using a mini-bioreactor system that independentlymonitors and controls pH, dissolved oxygen, and temperature for each ofits 24, 10-mL reactors. Independent monitoring and control of eachreactor in the cassette allows the exploration of a matrix ofenvironmental conditions known to influence S. oneidensis chromiumreduction. S. oneidensis MR-1 grew in minimal medium without amino acidor vitamin supplementation under aerobic … more
Date: March 16, 2006
Creator: Tang, Yinjie J.; Laidlaw, David; Gani, Kishen & Keasling, Jay D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chromosome-specific DNA Repeat Probes

Description: In research as well as in clinical applications, fluorescence in situ hybridization (FISH) has gained increasing popularity as a highly sensitive technique to study cytogenetic changes. Today, hundreds of commercially available DNA probes serve the basic needs of the biomedical research community. Widespread applications, however, are often limited by the lack of appropriately labeled, specific nucleic acid probes. We describe two approaches for an expeditious preparation of chromosome-specific… more
Date: March 16, 2006
Creator: Baumgartner, Adolf; Weier, Jingly Fung & Weier, Heinz-Ulrich G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fishery, Aquaculture, and Marine Mammal Legislation in the 109th Congress

Description: Fish and marine mammals are important resources in open ocean and nearshore coastal areas. Many laws and regulations guide the management of these resources by federal agencies. This report contains information on commercial and sport fisheries, aquaculture, and marine mammals and issues related to the 109th Congress.
Date: March 16, 2006
Creator: Buck, Eugene H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Temperature-Dependent Diffusion Coefficients from ab initio Computations: Hydrogen in Nickel

Description: The temperature-dependent mass diffusion coefficient is computed using transition state theory. Ab initio supercell phonon calculations of the entire system provide the attempt frequency, the activation enthalpy, and the activation entropy as a function of temperature. Effects due to thermal lattice expansion are included and found to be significant. Numerical results for the case of hydrogen in nickel demonstrate a strong temperature dependence of the migration enthalpy and entropy. Trapping i… more
Date: March 16, 2006
Creator: Wimmer, Erich; Wolf, Walter; Sticht, Jurgen; Saxe, Paul; Geller, Clint; Najafabadi, Reza et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Cavity Collapse and Surface Crater Formation for Selected Lawrence Livermore National Laboratory Underground Nuclear Tests - 2006

Description: This report describes evaluation of collapse evolution for selected LLNL underground nuclear tests at the Nevada Test Site (NTS). The work is being done at the request of Bechtel Nevada and supports the Department of Energy National Nuclear Security Association Nevada Site Office Borehole Management Program (BMP). The primary objective of this program is to close (plug) weapons program legacy boreholes that are deemed no longer useful. Safety decisions must be made before a crater area, or pote… more
Date: March 16, 2006
Creator: Pawloski, G. A. & Raschke, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Overview of Light-Ion Beam Therapy

Description: In 1930, Ernest Orlando Lawrence at the University of California at Berkeley invented the cyclotron. One of his students, M. Stanley Livingston, constructed a 13-cm diameter model that had all the features of early cyclotrons, accelerating protons to 80 keV using less than 1 kV on a semi-circular accelerating electrode, now called the ''dee''. Soon after, Lawrence constructed the first two-dee 27-Inch (69-cm) Cyclotron, which produced protons and deuterons of 4.8 MeV. In 1939, Lawrence construc… more
Date: March 16, 2006
Creator: Chu, William T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Uranium and Neptunium Desorption from Yucca Mountain Alluvium

Description: Uranium and neptunium were used as reactive tracers in long-term laboratory desorption studies using saturated alluvium collected from south of Yucca Mountain, Nevada. The objective of these long-term experiments is to make detailed observations of the desorption behavior of uranium and neptunium to provide Yucca Mountain with technical bases for a more realistic and potentially less conservative approach to predicting the transport of adsorbing radionuclides in the saturated alluvium. This pap… more
Date: March 16, 2006
Creator: Scism, C. D.; Reimus, P. W.; Ding, M. & Chipera, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Colloidal Synthesis of Hollow Cobalt Sulfide Nanocrystals

Description: Formation of cobalt sulfide hollow nanocrystals through amechanism similar to the Kirkendall Effect has been investigated indetail. It was found that performing the reaction at>120oC leads tofast formation of a single void ins ide each shell, whereas at roomtemperature multiple voids are formed within each shell, which can beattributed to strongly temperature-dependent diffusivities for vacancies.The void formation process is dominated by outward diffusion of cobaltcations; still, significant i… more
Date: March 16, 2006
Creator: Yin, Yadong; Erdonmez, Can K.; Cabot, Andreu; Hughes, Steven & Alivisatos, A. Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Compositional and Structural Control on Anion Sorption Capability of Layered Double Hydroxides (LDHS)

Description: Layered double hydroxides (LDHs) have shown great promise as anion getters. In this paper, we demonstrate that the sorption capability of a LDH for a specific oxyanion can be greatly increased by appropriately manipulating material composition and structure. A large set of LDH materials have been synthesized with various combinations of metal cations, interlayer anions, and the molar ratios of divalent cation M(II) to trivalent cation M(III). The synthesized materials have then been tested syst… more
Date: March 16, 2006
Creator: Wang, Y. & Gao, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

U.S. Assistance to the Former Soviet Union

Description: Since 1992, the United States has provided more than $28 billion in assistance to the 12 states of the former Soviet Union (FSU). It continues to provide nearly $2 billion annually. This report describes the broad framework of U.S. assistance programs and policies in the region and then focuses on the FREEDOM Support Act (FSA) account under the foreign operations budget which, encompassing all U.S. objectives in the region, has often been the means by which Congress has expressed its views and … more
Date: March 16, 2006
Creator: Tarnoff, Curt
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Estate and Gift Tax Revenues: Several Measurements

Description: The question of whether to permanently repeal the federal estate tax or to reform it remains a topic of congressional interest.This report presents a variety of data measuring the payment of estate and gift taxes to help inform the debate.
Date: March 16, 2006
Creator: Noto, Nonna A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of ambient aerosols at the San Francisco International Airport using BioAerosol Mass Spectrometry

Description: The BioAerosol Mass Spectrometry (BAMS) system is a rapidly fieldable, fully autonomous instrument that can perform correlated measurements of multiple orthogonal properties of individual aerosol particles. The BAMS front end uses optical techniques to nondestructively measure a particle's aerodynamic diameter and fluorescence properties. Fluorescence can be excited at 266nm or 355nm and is detected in two broad wavelength bands. Individual particles with appropriate size and fluorescence prope… more
Date: March 16, 2006
Creator: Steele, P T; McJimpsey, E L; Coffee, K R; Fergenson, D P; Riot, V J; Tobias, H J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CHARACTERIZATION OF IN-SITU STRESS AND PERMEABILITY IN FRACTURED RESERVOIRS

Description: Using a 3-D finite difference method with a rotated-staggered-grid (RSG) scheme we generated synthetic seismograms for a reservoir model consisting of three horizontal layers with the middle layer containing parallel, equally spaced fractures. By separating and analyzing the backscattered signals in the FK domain, we can obtain an estimate of the fracture spacing. The fracture spacing is estimated by taking one-half of the reciprocal of the dominant wavenumber of the backscattered energy in dat… more
Date: March 16, 2006
Creator: Burns, Daniel R. & Toksoz, Nafi
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A SERENDIPITOUS, LONG-TERM INFILTRATION EXPERIMENT: WATER AND RADIONUCLIDE CIRCULATION BENEATH THE CAMBRIC TRENCH AT THE NEVADA TEST SITE.

Description: Underground atomic weapons testing at the Nevada Test Site introduced numerous radionuclides that may be used to characterize subsurface hydrologic transport processes in arid climates. Beginning in 1975, groundwater adjacent to the CAMBRIC test, conducted beneath Frenchman Flat in 1965, was pumped steadily for 16 years to elicit experimental information on the migration of residual radioactivity through the saturated zone. Radionuclides in the pumping well effluent, including tritium, {sup 36}… more
Date: March 16, 2006
Creator: Maxwell, R; Tompson, A; Carle, S; Zavarin, M & Kollet, S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lifetime of the 1s2s 3S1 metastable level in He-like S14+ measured with an electron beam ion trap

Description: A precision measurement of the lifetime of the lowest exited level of the He-like S{sup 14+} ion carried out at the Livermore EBIT-II electron beam ion trap yielded a value of (703 {+-} 4) ns. Our method extends the range of lifetime measurements accessible with electron beam ion traps into the nanosecond region and improves the accuracy of currently available data for this level by an order of magnitude.
Date: March 16, 2006
Creator: L?pez-Urrutia, J C; Beiersdorfer, P & Widmann, K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen