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DOD Officials Acted in Accordance With Executive Order for Addressing Security Classification Concerns

Description: Correspondence issued by the General Accounting Office with an abstract that begins "This report investigates whether the Department of Defense (DOD) misused the security classification process to stifle public discussion of problems with the National Missile Defense System. On May 11, 2000, Dr. Theodore Postol reported an alleged incident of fraud to John Podesta, former White House Chief of Staff. Dr. Postol wrote a letter that alleged scientific fraud by contractors involved in developing th… more
Date: June 12, 2001
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Business Systems Modernization: Results of Review of IRS' Customer Account Data Engine Project

Description: A letter report issued by the General Accounting Office with an abstract that begins "The Internal Revenue Service (IRS) began the Customer Account Data Engine (CADE) project to modernize the agency's outdated and inefficient data management system. This report determines (1) the reported status of CADE and IRS' plans for completing the project, (2) whether IRS is managing the relationship between CADE and the agency's enterprise architecture and current systems environment, (3) whether IRS is … more
Date: June 12, 2001
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Vehicle Safety: Technologies, Challenges, and Research and Development Expenditures for Advanced Air Bags

Description: A letter report issued by the General Accounting Office with an abstract that begins "The National Highway Traffic Safety Administration (NHTSA) has issued a rule requiring vehicle manufacturers to install advanced air bag systems in an increasing number of cars beginning in 2003. This report reviews the development of technologies that vehicle manufacturers plan to use to comply with the advanced air bag rule. GAO found that some advanced air bag technologies are now being installed in vehicle… more
Date: June 12, 2001
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fossil Fuel R&D: Lessons Learned in the Clean Coal Technology Program

Description: Testimony issued by the General Accounting Office with an abstract that begins "The Department of Energy's (DOE) Clean Coal Technology program provides cost-sharing assistance or partnerships with industry in demonstrating the commercial applications of emerging technologies, referred to as "clean coal." This testimony discusses the successes DOE has reported, some weaknesses GAO identified, and lessons learned in cost-sharing. GAO found that DOE has many examples of successes in the program, i… more
Date: June 12, 2001
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

The Barcelona Process: The European Union’s Partnership with the Southern Mediterranean

Description: This report contains the European Union's partnership with the Southern Mediterranean. It also provides a brief discussion of how the Barcelona Process related to the Middle East peace process, as well as to other U.S. interests.
Date: June 12, 2001
Creator: Linder, Anja & Ruebener, Joshua
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of Ultra Low Outgassing Rates for NLC UHV Vacuum Chambers

Description: Ultra low outgassing rates would be highly advantageous in accelerators and storage rings, such as the Next Linear Collider (NLC), where an outgassing rate of <10{sup -12} Torr liter/sec/cm{sup 2} could eliminate the need for costly distributed pumping. Measuring such low outgassing rates at room temperature has many difficulties. However, by inspection of Fick's law, it can be seen that thermal desorption is proportional to outgassing rate. It is commonly observed that the outgas rate doubl… more
Date: June 12, 2001
Creator: Kishiyama, K.; Shen, S.; Behne, D.; Corlett, J. N.; Atkinson, D.; Kennedy, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

What is a Shock Wave to an Explosive Molecule?

Description: An explosive molecule is a metastable chemical species that reacts exothermically given the correct stimulus. Impacting an explosive with a shock wave is a ''wake-up call'' or ''trigger'' which compresses and heats the molecule. The energy deposited by the shock wave must be distributed to the vibrational modes of the explosive molecule before chemical reaction can occur. If the shock pressure and temperature are high enough and last long enough, exothermic chemical decomposition can lead to th… more
Date: June 12, 2001
Creator: Tarver, Craig M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

BBU and Corkscrew Growth Predictions for the DARHT Second Axis Accelerator

Description: The second axis accelerator of the Dual Axis Radiographic Hydrodynamic Test (DARHT-II) facility will produce a 2-kA, 20-MeV, 2-{micro}s output electron beam with a design goal of less than 1000 {pi} mm-mrad normalized transverse emittance. In order to meet this goal, both the beam breakup instability (BBU) and transverse ''corkscrew'' motion (due to chromatic phase advance) must be limited in growth. Using data from recent experimental measurements of the transverse impedance of actual DARHT-II… more
Date: June 12, 2001
Creator: Chen, Y. J. & Fawley, W. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling of an Inductive Adder Kicker Pulser for a Proton Radiography System

Description: An all solid-state kicker pulser for a proton radiography system has been designed. Multiple solid-state modulators stacked in an inductive-adder configuration are utilized in this kicker pulser design. Each modulator is comprised of multiple metal-oxide-semiconductor field-effect transistors (MOSFETs) which quickly switch the energy storage capacitors across a magnetic induction core. Metglas is used as the core material to minimize loss. Voltage from each modulator is inductively added by a v… more
Date: June 12, 2001
Creator: Wang, L.; Caporaso, G. J. & Cook, E. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

NDPC (National Drought Policy Commission) Home

Description: The National Drought Policy Commission was established under the National Drought Policy Act of 1998, P.L.105-199. The Act charged the Commission with conducting a thorough study of drought and its impacts and submitting a report on its findings discussing the feasibility for creating a national drought policy. The NDPC report and accompanying materials is posted on this website and can be downloaded by the public.
Date: June 12, 2001
Creator: National Drought Policy Commission
Item Type: Refine your search to only Website
Partner: UNT Libraries Government Documents Department
open access

Manufacturing experience for the LHC inner triplet quadrupole cables

Description: The design for the U.S. LHC Inner Triplet Quadrupole magnet requires a 37 strand (inner layer) and a 46 strand (outer layer) cable. This represents the largest number of strands attempted to date for a production quantity of Rutherford-type cable. The cable parameters were optimized during the production of a series of short prototype magnets produced at FNAL. These optimization studies focused on critical current degradation, dimensional control, coil winding, and interstrand resistance. After… more
Date: June 12, 2001
Creator: Scanlan, R. M.; Higley, H. C.; Bossert, R.; Kerby, J.; Gosh, A. K.; Boivin, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

BBU and Corkscrew Growth Predictions for the Darht Second Axis Accelerator

Description: The second axis accelerator of the Dual Axis Radiographic Hydrodynamic Test (DARHT-II) facility will produce a 2-kA, 20-MeV, 2-{micro}s output electron beam with a design goal of less than 1000 {pi} mm-mrad normalized transverse emittance. In order to meet this goal, both the beam breakup instability (BBJ) and transverse corkscrew motion (due to chromatic phase advance) must be limited in growth. Using data from recent experimental measurements of the transverse impedance of actual DARHT-II acc… more
Date: June 12, 2001
Creator: Chen, Y. J. & Fawley, W. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ESADA Plutonium Program Critical Experiments: Power Distribution Measurements

Description: In 1967, a series of critical experiments were conducted at the Westinghouse Reactor Evaluation Center (WREC) using mixed-oxide (MOX) PuO{sub 2}-UO{sub 2} and/or UO{sub 2} fuels in various lattices and configurations. These experiments were performed under the joint sponsorship of Empire State Atomic Development Associates (ESADA) plutonium program and Westinghouse. The purpose of these experiments was to develop experimental data useful in validating analytical methods used in the design of pl… more
Date: June 12, 2001
Creator: Akkurt, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

EPA's Science Advisory Board Panels: Improved Policies and Procedures Needed to Ensure Independence and Balance

Description: A letter report issued by the General Accounting Office with an abstract that begins "This report reviews whether the policies and procedures of the Environmental Protection Agency's Science Advisory Board ensure that (1) its peer review panelists are independent and the panels are properly balanced and (2) the public is sufficiently informed about the points of view represented on the panels. GAO found that the policies and procedures used by the staff office to ensure the independence of the … more
Date: June 12, 2001
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correlation of Test Data from Some NIF Small Optical Components

Description: The NIF injection laser system requires over 8000 precision optical components. Two special requirements for such optics are wavefront and laser damage threshold. Wavefront gradient is an important specification on the NIF ILS optics. The gradient affects the spot size and, in the second order, the contrast ratio of the laser beam. Wavefront errors are specified in terms of peak-to-valley, rms, and rms gradient, with filtering requirements. Typical values are lambda/8 PV, lambda/30 rms, and lam… more
Date: June 12, 2001
Creator: Chow, R.; McBurney, M.; Eickelberg, W. K.; Williams, W. H. & Thomas, M. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Joining Uranium to Aluminum using Electron Beam Welding and an Explosively Clad Niobium Interlayer

Description: A uranium alloy was joined to a high strength aluminum alloy using a commercially pure niobium interlayer. Joining of the Nb interlayer to the aluminum alloy was performed using an explosive welding process, while joining the Nb interlayer to the uranium alloy was performed using an electron beam welding process. Explosive welding was selected to bond the Nb to the aluminum alloy in order to minimize the formation of brittle intermetallic phases. Electron beam welding was selected to join the N… more
Date: June 12, 2001
Creator: Elmer, J W; Terrill, P; Brasher, D & Butler, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Properties of Aluminum Deposited by a High-Velocity Oxygen-Fueled Process

Description: Aluminum coatings deposited by a HVOF process have been demonstrated and relevant coating properties evaluated according to two deposition parameters, the spray distance and the oxygen-to-fuel flow ratio. The coating porosity, surface roughness, and microhardness are measured. The coating properties are fairly insensitive to spray distance, the distance between the nozzle and the workpiece, and fuel ratios, the oxygen-to-fuel flow. Increasing the fuel content does appear to improve the process … more
Date: June 12, 2001
Creator: Chow, R; Decker, T A; Gansert, R V; Gansert, D & Lee, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Accuracy of Projection Methods for the Incompressible Navier-Stokes Equations

Description: Numerous papers have appeared in the literature over the past thirty years discussing projection-type methods for solving the incompressible Navier-Stokes equations. A recurring difficulty encountered is the choice of boundary conditions for the intermediate or predicted velocity in order to obtain at least second order convergence. A further issue is the formula for the pressure correction at each timestep. A simple overview is presented here based on recently published results by Brown, Corte… more
Date: June 12, 2001
Creator: Brown, D L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design Considerations of Fast Kicker Systems for High Intensity Proton Accelerators

Description: In this paper, we discuss the specific issues related to the design of the Fast Kicker Systems for high intensity proton accelerators. To address these issues in the preliminary design stage can be critical since the fast kicker systems affect the machine lattice structure and overall design parameters. Main topics include system architecture, design strategy, beam current coupling, grounding, end user cost vs. system cost, reliability, redundancy and flexibility. Operating experience with the … more
Date: June 12, 2001
Creator: Zhang, W.; Sandberg, J.; Parson, W. M.; Walstrom, P.; Murray, M. M.; Cook, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Split-Step Scheme for the Incompressible Navier-Stokes

Description: We describe a split-step finite-difference scheme for solving the incompressible Navier-Stokes equations on composite overlapping grids. The split-step approach decouples the solution of the velocity variables from the solution of the pressure. The scheme is based on the velocity-pressure formulation and uses a method of lines approach so that a variety of implicit or explicit time stepping schemes can be used once the equations have been discretized in space. We have implemented both second-or… more
Date: June 12, 2001
Creator: Henshaw, W & Petersson, N A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Extraction Kickers and Modulators for the advanced Hydrodynamic Facility

Description: In order to exploit the full potential of the Advanced Hydrodynamic Facility (AHF) facility to produce a time sequence of proton transmission radiographs throughout the dynamic event, a kicker/modulator for extraction from the 50 GeV ring that is capable of generating a string of 25 pulse pairs at arbitrary times within a total time duration of 100 microseconds or more is desired. The full range of desired pulse-train requirements cannot be met with the commonly used pulse-forming cables or net… more
Date: June 12, 2001
Creator: Walstrom, P L & Cook, E G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The next linear collider damping ring complex

Description: We report progress on the design of the Next Linear Collider (NLC) Damping Rings complexes. The purpose of the damping rings is to provide low emittance electron and positron bunch trains to the NLC linacs, at a rate of 120 Hz. As an option to operate at the higher rate of 180 Hz, two 1.98 GeV main damping rings per beam are proposed, and one positron pre-damping ring. The main damping rings store up to 0.8 amp in 3 trains of 190 bunches each and have normalized extracted beam emittances {gamma… more
Date: June 12, 2001
Creator: Corlett, J.; Atkinson, D.; De Santis, S.; Hartman, N.; Kennedy, K.; Li, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Impedance and instabilities in the NLC damping rings

Description: We report on impedance calculations and single-bunch and multi-bunch instabilities in the NLC damping rings. Preliminary designs of vacuum chambers and major components have addressed beam impedance issues, with the desire to increase instability current thresholds and reducing growth rates. MAFIA calculations of short-range and long-range wakefields have allowed computations of growth rates and thresholds, which are presented here. Resistive wall instability dominates long-range effects, and r… more
Date: June 12, 2001
Creator: Corlett,J.; Li, D.; Pivi, M.; Rimmer, R.; DeSantis, S.; Wolski, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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