UNT Libraries Government Documents Department - 1,063 Matching Results

Search Results

open access

Ceramic Processing

Description: Ceramics represent a unique class of materials that are distinguished from common metals and plastics by their: (1) high hardness, stiffness, and good wear properties (i.e., abrasion resistance); (2) ability to withstand high temperatures (i.e., refractoriness); (3) chemical durability; and (4) electrical properties that allow them to be electrical insulators, semiconductors, or ionic conductors. Ceramics can be broken down into two general categories, traditional and advanced ceramics. Traditi… more
Date: November 24, 1999
Creator: EWSUK,KEVIN G.
open access

Corrosion Issues in Solder Joint Design and Service

Description: Corrosion is an important consideration in the design of a solder joint. It must be addressed with respect to the service environment or, as in the case of soldered conduit, as the nature of the medium being transported within piping or tubing. Galvanic-assisted corrosion is of particular concern, given the fact that solder joints are comprised of different metals or alloy compositions that are in contact with one-another. The (thermodynamic) potential for corrosion to take place in a particula… more
Date: November 24, 1999
Creator: VIANCO,PAUL T.
open access

Current-limited imposed-potential technique for inducing and monitoring metastable pitting events

Description: A technique has been developed to selectively induce metastable pitting while preventing the transition to stable pit growth. The current-limited imposed-potential (CLIP) technique limits available cathodic current to an initiated site using a resistor in series with the working electrode to form a voltage divider. Potentiodynamic CLIP testing yields a distribution of breakdown potentials from a single experiment. Potentiostatic CLIP testing yields induction time data, which can be used as inpu… more
Date: November 24, 1999
Creator: Wall, F.D.
open access

A Database of Herbaceous Vegetation Responses to Elevated Atmospheric CO{sub 2}

Description: To perform a statistically rigorous meta-analysis of research results on the response by herbaceous vegetation to increased atmospheric CO{sub 2} levels, a multiparameter database of responses was compiled from the published literature. Seventy-eight independent CO{sub 2}-enrichment studies, covering 53 species and 26 response parameters, reported mean response, sample size, and variance of the response (either as standard deviation or standard error). An additional 43 studies, covering 25 spec… more
Date: November 24, 1999
Creator: Jones, M.H.
open access

Design and development of a cathode processor for electrometallurgical treatment of spent nuclear fuel

Description: The electrometallurgical processing of spent fuel developed at Argonne National Laboratory produces a cathode which contains dendrites of heavy metal (principally U), salts, and residual cadmium. The cathode requires further treatment which is accomplished by loading it into a cathode processor to first purify and then consolidate the heavy metal. The principal steps in cathode processing are: the cathode is loaded into a crucible and both loaded into the cathode processor; the crucible is heat… more
Date: November 24, 1999
Creator: Brunsvold, A. R.; Roach, P. D. & Westphal, B. R.
open access

Food Assistance: Efforts to Control Fraud and Abuse in the Child and Adult Care Food Program Should be Strengthened

Description: A letter report issued by the General Accounting Office with an abstract that begins "GAO reviewed the Food and Nutrition Service's (FNS) efforts to control the fraud and abuses occurring in its state administered Child and Adult Care Food Program, focusing on: (1) the extent to which the states have implemented required and recommended controls to prevent and detect fraud and abuse; and (2) FNS' effectiveness in directing the states' efforts to implement these controls."
Date: November 24, 1999
Creator: United States. General Accounting Office.
open access

Generalized b-spline subdivision-surface wavelets and lossless compression

Description: We present a new construction of wavelets on arbitrary two-manifold topology for geometry compression. The constructed wavelets generalize symmetric tensor product wavelets with associated B-spline scaling functions to irregular polygonal base mesh domains. The wavelets and scaling functions are tensor products almost everywhere, except in the neighborhoods of some extraordinary points (points of valence unequal four) in the base mesh that defines the topology. The compression of arbitrary poly… more
Date: November 24, 1999
Creator: Bertram, M; Duchaineau, M A; Hamann, B & Joy, K I
open access

Housekeeping Closure Report for Corrective Action Unit 463: Areas 2, 3, 9, and 25 Housekeeping Waste Sites, Nevada Test Site, Nevada

Description: The Federal Facility Agreement and Consent Order was entered into by the State of Nevada, U.S. Department of Energy, and U.S. Department of Defense to identify sites of potential historical contamination and implement corrective actions based on public health and environmental considerations. The facilities subject to this agreement include the Nevada Test Site (NTS), parts of the Tonopah Test Range, parts of the Nellis Air Force Range, the Central Nevada Test Area, and the Project Shoal Area. … more
Date: November 24, 1999
Creator: United States. Department of Energy. Nevada Operations Office.
open access

Implementation of a distributed multiterabyte storage system

Description: The University of Chicago and Argonne National Laboratory are building a highly distributed storage system to meet the needs of a cross-disciplinary group of scientists and to investigate the issues involved in implementing such a system. The storage system is based on IBM 3590/3494 tape technology managed by ADSM software. High-speed wide-area networking is required to support the distributed user community. NFS, DFS, FTP, and other user access methods are supported. A simulation project under… more
Date: November 24, 1999
Creator: Hereld, M.; Nickless, B. & Stevens, R.
open access

Long-Range Neutron Detection

Description: A neutron detector designed for detecting neutron sources at distances of 50 to 100 m has been constructed and tested. This detector has a large surface area (1 m^2) to enhance detection efficiency, and it contains a collimator and shielding to achieve direction sensitivity and reduce background. An unusual feature of the detector is that it contains no added moderator, such as polyethylene, to moderate fast neutrons before they reach the 3He detector. As a result, the detector is sensitive mai… more
Date: November 24, 1999
Creator: Peurrung, Anthony J.; Stromswold, David C.; Hansen, Randy R.; Reeder, Paul L. & Barnett, Debra S.
open access

Long-Range Neutron Detection

Description: A neutron detector designed for detecting neutron sources at distances of 50 to 100 m has been constructed and tested. This detector has a large surface area (1 m{sup 2}) to enhance detection efficiency, and it contains a collimator and shielding to achieve direction sensitivity and reduce background. An unusual feature of the detector is that it contains no added moderator, such as polyethylene, to moderate fast neutrons before they reach the {sup 3}He detector. As a result, the detector is se… more
Date: November 24, 1999
Creator: Peurrung, AJ; Stromswold, DC; Hansen, RR; Reeder, PL & Barnett, DS
open access

Magnetic field generation from Self-Consistent collective neutrino-plasma interactions

Description: A new Lagrangian formalism for self-consistent collective neutrino-plasma interactions is presented in which each neutrino species is described as a classical ideal fluid. The neutrino-plasma fluid equations are derived from a covariant relativistic variational principle in which finite-temperature effects are retained. This new formalism is then used to investigate the generation of magnetic fields and the production of magnetic helicity as a result of collective neutrino-plasma interactions.
Date: November 24, 1999
Creator: Brizard, A. J.; Murayama, H. & Wurtele, J. S.
open access

Observation of Localized Corrosion of Ni-Based Alloys Using Coupled Orientation Imaging Microscopy and Atomic Force Microscopy

Description: We present a method for assessing the relative vulnerabilities of distinct classes of grain boundaries to localized corrosion. Orientation imaging microscopy provides a spatial map which identifies and classifies grain boundaries at a metal surface. Once the microstructure of a region of a sample surface has been characterized, a sample can be exposed to repeated cycles of exposure to a corrosive environment alternating with topographic measurement by an atomic force microscope in the same regi… more
Date: November 24, 1999
Creator: Bedrossian, P. J.
open access

Review of Subcritical Source-Driven Noise Analysis Measurements

Description: Subcritical source-driven noise measurements are simultaneous Rossi-{alpha} and randomly pulsed neutron measurements that provide measured quantities that can be related to the subcritical neutron multiplication factor. In fact, subcritical source-driven noise measurements should be performed in lieu of Rossi-{alpha} measurements because of the additional information that is obtained from noise measurements such as the spectral ratio and the coherence functions. The basic understanding of sourc… more
Date: November 24, 1999
Creator: Valentine, T.E.
open access

Solid State Experiments at High Pressure and Strain Rates

Description: Experiments have been developed using high powered laser facilities to study the response of materials in the solid state under extreme pressures and strain rates. Details of the target and drive development required for solid state experiments and results from two separate experiments are presented. In the first, thin foils were compressed to a peak pressure of 180 GPa and accelerated. A pre-imposed modulation at the embedded RT unstable interface was observed to grow. The growth rates were fl… more
Date: November 24, 1999
Creator: Kalantar, D. H.; Remington, B. A.; Colvin, J. D.; Mikaelian, K. O.; Weber, S. V.; Wiley, L. G. et al.
open access

Using Cytochrome c{sub 3} to Make Selenium Nanowires

Description: We report on a new method to make nanostructures, in this case selenium nanowires, in aqueous solution at room temperature. We used the protein cytochrome c{sub 3} to reduce selenate (SeO{sub 4}{sup 2{minus}}) to selenium (Se{sup 0}). Cytochrome c{sub 3} is known for its ability to catalyze reduction of metals including U{sup VI} {yields} U{sup IV}, Cr{sup VI} {yields} Cr{sup III}, Mo{sup VI} {yields} Mo{sup IV}, Cu{sup II} {yields} Cu{sup 0}, Pb{sup II} {yields} Pb{sup 0}, Hg{sup II} {yields} … more
Date: November 24, 1999
Creator: Abdelouas, A.; Franco, R.; Gong, W. L.; Lutze, W.; Moura, I. & Shelnutt, John A.
open access

Modeling Manufacturing Processes to Mitigate Technological Risk

Description: An economic model is a tool for determining the justifiable cost of new sensors and subsystems with respect to value and operation. This process balances the R and D costs against the expense of maintaining current operations and allows for a method to calculate economic indices of performance that can be used as control points in deciding whether to continue development or suspend actions. The model can also be used as an integral part of an overall control loop utilizing real-time process dat… more
Date: October 24, 1999
Creator: Allgood, G. O. & Manges, W. W.
open access

Appropriations for FY2000: Energy and Water Development

Description: This report discusses the Energy and Water Development FY2000 appropriations bill, which includes funding for civil projects of the Army Corps of Engineers, the Department of the Interior's Bureau of Reclamation (BuRec), most of the Department of Energy (DOE), and a number of independent agencies.
Date: September 24, 1999
Creator: Humphries, Marc & Behrens, Carl E.
open access

BNL Citric Acid Technology: Pilot Scale Demonstration

Description: The objective of this project is to remove toxic metals such as lead and cadmium from incinerator ash using the Citric Acid Process developed at Brookhaven National Laboratory. In this process toxic metals in bottom ash from the incineration of municipal solid waste were first extracted with citric acid followed by biodegradation of the citric acid-metal extract by the bacterium Pseudomonas fluorescens for metals recovery. The ash contained the following metals: Al, As, Ba, Ca, Cd, Cr, Cu, Fe, … more
Date: September 24, 1999
Creator: Francis, A. J.; Dodge; J, C; Gillow, J. B. & Forrester, K. E.
open access

Capital Gains Taxes: Distributional Effects

Description: This report presents several different measures of the distribution of the capital gains tax are presented. These measures examine the absolute and relative distribution across income classes, the effects on the distribution of taxes, and the proportion of the population affected by the tax.
Date: September 24, 1999
Creator: Gravelle, Jane G.
open access

Certification Requirements: New Guidance Should Encourage Transparency in Agency Decisionmaking

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed federal agencies' certification requirements for goods and services, focusing on: (1) the extent and variety of certification activities in the federal government; (2) the extent to which there are policies, procedures, or guidance governing those activities, either governmentwide or within selected agencies; and (3) an agency certification procedure that could… more
Date: September 24, 1999
Creator: United States. General Accounting Office.
open access

Challenges in the Packaging of MEMS

Description: Microelectromechanical Systems (MEMS) packaging is much different from conventional integrated circuit (IC) packaging. Many MEMS devices must interface to the environment in order to perform their intended function, and the package must be able to facilitate access with the environment while protecting the device. The package must also not interfere with or impede the operation of the MEMS device. The die attachment material should be low stress, and low outgassing, while also minimizing stress… more
Date: September 24, 1999
Creator: BROWN, WILLIAM D.; EATON, WILLIAM P.; MALSHE, AJAY P.; MILLER, WILLIAM M.; O'NEAL, CHAD & SINGH, SUSHILA B.
open access

Corrective Action Decision Document for Corrective Action Unit 407: Roller Coaster RADSAFE Area, Tonopah Test Range, Nevada

Description: This Corrective Action Decision Document identifies and rationalizes the U.S. Department of Energy, Nevada Operations Office's selection of a recommended corrective action alternative (CAA) appropriate to facilitate the closure of Corrective Action Unit (CAU) 407, Roller Coaster RADSAFE Area (RCRSA), under the Federal Facility Agreement and Consent Order. Located on Tonopah Test Range (TTR), CAU 407 is located approximately 140 miles northwest of Las Vegas, Nevada, and five miles south of Area … more
Date: September 24, 1999
Creator: United States. Department of Energy. Nevada Operations Office.
open access

Distributed control of protein crystallography beamline 5.0 using CORBA

Description: The Protein Crystallography Beamline at Berkeley Lab's Advanced Light Source is a facility that is being used to solve the structure of proteins. The software that is being used to control this beamline uses Java for user interface applications which communicate via CORBA with workstations that control the beamline hardware. We describe the software architecture for the beamline and our experiences after two years of operation.
Date: September 24, 1999
Creator: Timossi, Chris
Back to Top of Screen