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Brittle and Ductile Behavior in Carbon Nanotubes

Description: Article discussing research on the response of carbon nanotubes to a tensile load.
Date: November 23, 1998
Creator: Buongiorno Nardelli, Marco; Yakobson, Boris I. & Bernholc, Jerry
Partner: UNT College of Arts and Sciences
open access

Mechanism of strain release in carbon nanotubes

Description: Article on the mechanism of strain release in carbon nanotubes.
Date: February 15, 1998
Creator: Buongiorno Nardelli, Marco; Yakobson, Boris I. & Bernholc, Jerry
Partner: UNT College of Arts and Sciences
open access

SLâ‚‚-polynomial invariance

Description: Article on SLâ‚‚-polynomial invariance. The purpose of this article is to describe completely, in a constructive way, the structure of these invariant polynomials in the particular case n = 2, for an arbitrary field k.
Date: 1998
Creator: Anghel, Nicolae
Partner: UNT College of Arts and Sciences
open access

Investigating the Screwdriver: 25 Years of Technology Change

Description: Article broadly discussing some of the technological changes in vocational education over the last 25 years, as well as strategies for implementation and planning in the new millennium.
Date: 1998
Creator: Allen, Jeff M. & Wircenski, Jerry L.
Partner: UNT College of Information
open access

Structural Formation Studies of UV-Catalyzed Gels and Aerogels by Light Scattering

Description: The skeletal structure of aerogel is determined before, during, and after the gel is formed. Supercritical drying of aerogel largely preserves the pore structure that is determined near the time of gelation. To better understand these gel formation mechanisms we carried out measurements of the time evolution of light scattering in a series of gels prepared without conventional acid or base catalysis. Instead, ultraviolet light was used to catalyze the formation of silica gels made from the hydr… more
Date: April 1, 1998
Creator: Hunt, Arlon J. & Ayers, Michael R.
Partner: UNT Libraries Government Documents Department
open access

Beam Comissioning of the PEP-II High Energy Ring

Description: The PEP-II High Energy Ring (HER), a 9 GeV electron storage ring, has been in commissioning since spring 1997. Initial beam commissioning activities focused on systems checkout and commissioning and on determining the behavior of the machine systems at high beam currents. This phase culminated with the accumulation of 0.75 A of stored beam-sufficient to achieve design luminosity--in January 1998 after 3.5 months of beam time. Collisions with the 3 GeV positron beam of the Low Energy Ring (LER) … more
Date: November 12, 1998
Creator: Wienands, U.; Anderson, S.; Assmann, R.; Bharadwaj, V.; Cai, Y.; Clendenin, J. et al.
Partner: UNT Libraries Government Documents Department
open access

A Sealed-Accelerator-Tube Neutron Generator for Boron Neutron Capture Therapy Application

Description: Radio-frequency (RF) driven ion sources are being developed in Lawrence Berkeley National Laboratory (LBNL) for sealed-accelerator-tube neutron generator applications. By using a 2.5-cm-diameter RF-driven multicusp source and a computer designed 100 keV accelerator column, peak extractable hydrogen current exceeding 1 A from a 3-mm-diameter aperture, together with H{sup +} yields over 94% have been achieved. These experimental findings together with recent moderator design will enable one to de… more
Date: June 1, 1998
Creator: Leung, K. N.; Leung, K. N.; Lee, Y.; Verbeke, J. M.; Vurjic, J.; Williams, M. D. et al.
Partner: UNT Libraries Government Documents Department
open access

Conformal Field Theories: From Old to New

Description: In a short review of recent work, we discuss the general problem of constructing the actions of new conformal field theories from old conformal field theories. Such a construction follows when the old conformal field theory admits new conformal stress tensors in its chiral algebra, and it turns out that the new conformal field theory is generically a new spin-two gauge theory. As an example we discuss the new spin-two gauged sigma models which arise in this fashion from the general conformal no… more
Date: February 11, 1998
Creator: Halpern, M. B. & Schwartz, C.
Partner: UNT Libraries Government Documents Department
open access

Determination of the radionuclide release factor for an evaporator process using nondestructive assay

Description: The 242-A Evaporator is the primary waste evaporator for the Hanford Site radioactive liquid waste stored in underground double-shell tanks. Low pressure evaporation is used to remove water from the waste, thus reducing the amount of tank space required for storage. The process produces a concentrated slurry, a process condensate, and an offgas. The offgas exhausts through two stages of high-efficiency particulate air (HEPA) filters before being discharged to the atmosphere 40 CFR 61 Subpart H … more
Date: July 6, 1998
Creator: Johnson, R. E.
Partner: UNT Libraries Government Documents Department
open access

Clustering of radioactive tank waste data and comparison to historical models

Description: The US Department of Energy (DOE) has initiated remediation for stored high-level radioactive wastes. At the DOE Hanford site in southeastern Washington, 149 large underground tanks contain such wastes, generated by various chemical processes during the manufacture of plutonium for nuclear weapons. One of the key steps in this remediation effort is to characterize the waste stored in these tanks so that it can be treated properly and safely. A number of samples have been extracted from a subset… more
Date: June 10, 1998
Creator: Simpson, B. C.
Partner: UNT Libraries Government Documents Department
open access

LBR deactivation information exchange

Description: This report contains vugraphs of presentations given at the meeting. The topics covered include the following: FFTF Deactivation Strategy; Sodium Drain and Disposition; Sodium Processing; and Fuel Storage and Disposition.
Date: May 15, 1998
Creator: Guttenberg, S.
Partner: UNT Libraries Government Documents Department
open access

Chemicals and excess materials disposition during facility deactivation as a means of pollution prevention

Description: This paper presents several innovative and common sense approaches to pollution prevention that have been employed during facility deactivation at the Hanford Site in South Central Washington. It also presents several pollution prevention principles applicable to other projects. Innovative pollution prevention ideas employed at the Hanford site during facility deactivation included: (1) Recycling more than 185,000 gallons of radioactively contaminated nitric acid by sending it to an operating n… more
Date: May 28, 1998
Creator: Godfrey, S. D.
Partner: UNT Libraries Government Documents Department
open access

Lockheed Martin Hanford Corporation systems engineering project management

Description: Lockheed Martin Hanford Corporation is developing and implementing an integrated technical baseline for cleaning up environmental contamination at the Hanford Site in Washington State. The Hanford Site is located in Washington State and has been referred to as one of the largest Environmental Cleanup challenges in the US. It became contaminated with radioactive and dangerous wastes during the 40+ years it was being used to produce weapons grade plutonium in support of the US nuclear weapons pro… more
Date: April 1, 1998
Creator: Baynes, P. A.
Partner: UNT Libraries Government Documents Department
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Waste processing air cleaning

Description: Waste processing and preparing waste to support waste processing relies heavily on ventilation. Ventilation is used at the Hanford Site on the waste storage tanks to provide confinement, cooling, and removal of flammable gases.
Date: July 27, 1998
Creator: Kriskovich, J. R.
Partner: UNT Libraries Government Documents Department
open access

USDOE LABORATORY VIEWS ON U.S.-RUSSIAN PARTNERSHIP FOR NUCLEAR SECURITY.

Description: This paper summarizes an analysis of the U.S.-Russian Nuclear Material Protection, Control and Accounting (MPC&A) Program, developed on the basis of extensive discussions with U.S. laboratory participants as well as personal experience. Results of the discussions have been organized into three main areas: Technical/MPC&A Progress; Programmatic and Administrative Issues; and Professional Aspects, Implications for MPC&A effectiveness, for MPC&A sustainability, and for future relat… more
Date: July 26, 1998
Creator: KEMPF,C. R.
Partner: UNT Libraries Government Documents Department
open access

Three dimensional field calculations for a Short Superconducting Dipole for the UCLA Ultra Compact Synchrotron

Description: The Ultra Compact Synchrotron (UCS), proposed for UCLA, is a compact 1.5 GeV electron light source with superconducting magnets to produce X rays with a critical energy of about 10 keV. The design physical length (cold length) for the dipole is 418 mm. The synchrotron requires that a uniform field be produced in a region that is 180 mm wide by 40 mm high by about 380 mm long. The end regions of the dipole should be short compared to the overall length of the dipole field region. A Vobly H type … more
Date: August 1, 1998
Creator: Green, M.A. & Taylor, C.E.
Partner: UNT Libraries Government Documents Department
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