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Ab initio Monte Carlo investigation of small lithium clusters.

Description: Structural and thermal properties of small lithium clusters are studied using ab initio-based Monte Carlo simulations. The ab initio scheme uses a Hartree-Fock/density functional treatment of the electronic structure combined with a jump-walking Monte Carlo sampling of nuclear configurations. Structural forms of Li{sub 8} and Li{sub 9}{sup +} clusters are obtained and their thermal properties analyzed in terms of probability distributions of the cluster potential energy, average potential energ… more
Date: June 16, 1999
Creator: Srinivas, S.
Item Type: Refine your search to only Article
open access

Activity Based Startup Plan for Prototype Vertical Denitration Calciner

Description: Testing activities on the Prototype Vertical Denitration Calciner at Plutonium Finish Plant (PFP) were suspended in January 1997 due to the hold on fissile material handling in the facility. The restart of testing activities will require a review through an activity based startup process based upon Integrated Safety Management (ISM) principles to verify readiness. The Activity Based Startup Plan for the Prototype vertical Denitration Calciner has been developed for this process.
Date: August 16, 1999
Creator: SUTTER, C.S.
Item Type: Refine your search to only Report
open access

Adsorption of Pu(IV) Polymer onto 304L Stainless Steel

Description: 'The report, Technical Basis for Safe Operations with Pu-239 Polymer in NMS S Operating Facilities (F H Areas), (WSRC-TR-99-00008) was issued in an effort to upgrade the Authorization Basis (AB) for H Area facilities relative to nuclear criticality. At the time, insufficient data were found in the literature to quantify the adsorption of Pu polymer onto the surfaces of stainless steel tanks. Additional experimental or literature information on the adsorption of Pu(IV) polymer and its removal wa… more
Date: July 16, 1999
Creator: Bronikowski, M.G.
Item Type: Refine your search to only Report
open access

The algebras of large N matrix mechanics

Description: Extending early work, we formulate the large N matrix mechanics of general bosonic, fermionic and supersymmetric matrix models, including Matrix theory: The Hamiltonian framework of large N matrix mechanics provides a natural setting in which to study the algebras of the large N limit, including (reduced) Lie algebras, (reduced) supersymmetry algebras and free algebras. We find in particular a broad array of new free algebras which we call symmetric Cuntz algebras, interacting symmetric Cuntz a… more
Date: September 16, 1999
Creator: Halpern, M.B. & Schwartz, C.
Item Type: Refine your search to only Article
open access

Alternatives Generation and Analysis for Phase 1 High Level Waste Feed Tanks Selection

Description: A recent revision of the US. Department of Energy privatization contract for the immobilization of high-level waste (HLW) at Hanford necessitates the investigation of alternative waste feed sources to meet contractual feed requirements. This analysis identifies wastes to be considered as HLW feeds and develops and conducts alternative analyses to comply with established criteria. A total of 12,426 cases involving 72 waste streams are evaluated and ranked in three cost-based alternative models. … more
Date: August 16, 1999
Creator: CRAWFORD, T.W.
Item Type: Refine your search to only Report
open access

Anion photoelectron spectroscopy of radicals and clusters

Description: Anion photoelectron spectroscopy is used to study free radicals and clusters. The low-lying {sup 2}{Sigma} and {sup 2}{Pi} states of C{sub 2n}H (n = 1--4) have been studied. The anion photoelectron spectra yielded electron affinities, term values, and vibrational frequencies for these combustion and astrophysically relevant species. Photoelectron angular distributions allowed the author to correctly assign the electronic symmetry of the ground and first excited states and to assess the degree o… more
Date: December 16, 1999
Creator: Travis, Taylor R.
Item Type: Refine your search to only Thesis or Dissertation
open access

Applications of Multivariate Statistical Analysis (MSA) in Microanalysis

Description: Recent improvements in computer hardware and software for the acquisition, storage and analysis of series of spectra and images allow for a change in strategy for quantitative microanalysis. For example, in the area of X-ray microanalysis, whereas compositional analysis and elemental distributions have been traditionally performed using point microanalysis and simple intensity mapping from a ROI, respectively, the two tasks are now routinely performed simultaneously through X-ray spectrum-imagi… more
Date: February 16, 1999
Creator: Anderson, I. M.
Item Type: Refine your search to only Article
open access

Aqueous complexation of trivalent lanthanide and actinide cations by N,N,N'{sub 2},N'-tetrakis(2-pyridylmethyl)ethylenediamine.

Description: The aqueous complexation reactions of trivalent lanthanide and actinide cations with the hexadentate ligand N,N,N{prime},N{prime}-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN), have been characterized using potentiometric and spectroscopic techniques in 0.1 M NaClO{sub 4} At 25 C, the stability constant of Am(TPEN){sup 3+} is two orders of magnitude larger than that of Sm(TPEN){sup 3+}, reflecting the stronger interactions of the trivalent actinide cations with softer ligands as compared to l… more
Date: June 16, 1999
Creator: Beitz, J. V.; Ensor, D. D.; Jensen, M. P. & Morss, L. R.
Item Type: Refine your search to only Article
open access

Automated Damage Onset Analysis Techniques Applied to KDP Damage and the Zeus Small Area Damage Test Facility

Description: Automated damage testing of KDP using LLNL's Zeus automated damage test system has allowed the statistics of KDP bulk damage to be investigated. Samples are now characterized by the cumulative damage probability curve, or S-curve, that is generated from hundreds of individual test sites per sample. A HeNe laser/PMT scatter diagnostic is used to determine the onset of damage at each test site. The nature of KDP bulk damage is such that each scatter signal may possess many different indicators of… more
Date: December 16, 1999
Creator: Sharp, R. & Runkel, M.
Item Type: Refine your search to only Article
open access

Best Practices: DOD Training Can Do More to Help Weapon System Programs Implement Best Practices

Description: A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO evaluated the role the Department of Defense (DOD) training is playing in implementing best practices in weapon system programs, focusing on the: (1) contribution DOD training makes to program offices' ability to apply best practices; (2) different methods used by DOD and leading commercial firms in training on best practices; and (3) strategic approaches that underlie… more
Date: August 16, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
open access

Better Methods for Predicting Lifetimes of Seal Materials

Description: We have been working for many years to develop better methods for predicting the lifetimes of polymer materials. Because of the recent interest in extending the lifetimes of nuclear weapons and the importance of environmental seals (o-rings, gaskets) for protecting weapon interiors against oxygen and water vapor, we have recently turned our attention to seal materials. Perhaps the most important environmental o-ring material is butyl rubber, used in various military applications. Although it is… more
Date: March 16, 1999
Creator: Celina, M.; Gillen, K. T. & Keenan, M. R.
Item Type: Refine your search to only Article
open access

CAFE: A Computer Tool for Accurate Simulation of the Regulatory Pool Fire Environment for Type B Packages

Description: The Container Analysis Fire Environment computer code (CAFE) is intended to provide Type B package designers with an enhanced engulfing fire boundary condition when combined with the PATRAN/P-Thermal commercial code. Historically an engulfing fire boundary condition has been modeled as {sigma}T{sup 4} where {sigma} is the Stefan-Boltzman constant, and T is the fire temperature. The CAFE code includes the necessary chemistry, thermal radiation, and fluid mechanics to model an engulfing fire. Eff… more
Date: March 16, 1999
Creator: Gritzo, L. A.; Koski, J. A. & Suo-Anttila, A. J.
Item Type: Refine your search to only Article
open access

Calculating the Diffuse Responsivity of Solar Pyranometers

Description: Pyranometers are used to measure the global and diffuse components of solar irradiance. One of the methods to calculate the unshade (global) responsivity of a pyranometer is the standard shading method, described in the Annual Book of ASTM Standards, section 14, volume 14.02. In this paper, the standard method is used to calculate the shade (diffuse) responsivity of a pyranometer by accounting for the zenith and azimuth response of the pyranometer. A discussion of the effect of pyranometer offs… more
Date: August 16, 1999
Creator: Reda, I. & Myers, D.
Item Type: Refine your search to only Report
open access

Can lepton flavor violating interactions explain the atmospheric neutrino anomaly

Description: We investigate whether flavor changing neutrino interactions (FCNIs) can be sufficiently large to provide a viable solution to the atmospheric neutrino problem. Effective operators induced by heavy boson exchange that allow for flavor changing neutrino scattering off quarks or electrons are related by an SU(2){sub L} rotation to operators that induce anomalous tau decays. Since SU(2){sub L} violation is small for New Physics at or above the weak scale, one can use the upper bounds on lepton fla… more
Date: September 16, 1999
Creator: Grossman, yuval
Item Type: Refine your search to only Report
open access

Canberra Alpha Sentry Installation Functional Design Criteria (FDC)

Description: This document provides the functional design criteria for the installation of the Canberra Alpha Sentry System at selected locations within the Plutonium Finishing Plant (PFP). The equipment being installed is identified by part number in Section 3 and the locations are given in Section 5. The design, procurement and installation are assigned to Fluor Federal Services.
Date: December 16, 1999
Creator: White, W. F.
Item Type: Refine your search to only Report
open access

Capillary Waves at Liquid/Vapor Interfaces: A Molecular Dynamics Simulation

Description: Evidence for capillary waves at a liquid/vapor interface are presented from extensive molecular dynamics simulations of a system containing up to 1.24 million Lennard-Jones particles. Careful measurements show that the total interfacial width depends logarithmically on L{sub {parallel}}, the length of the simulation cell parallel to the interface, as predicted theoretically. The strength of the divergence of the interfacial width on L{sub {parallel}} depends inversely on the surface tension {ga… more
Date: July 16, 1999
Creator: Sides, Scott W.; Grest, Gary S. & Lacasse, Martin-D.
Item Type: Refine your search to only Article
open access

Cast Polycrystalline Photovoltaic Module Manufacturing Technology Improvements; Final Subcontract Report, 8 December 1993-30 April 1998

Description: This report summarizes work performed by Solarex, A Business Unit of Amoco/Enron Solar, under this subcontract. Among the accomplishments during the program are the following: Converting all of the production casting stations to increase ingot size, operating them at equivalent yields and cell efficiencies, and thus doubling the casting capacity at a 20% lower cost than the cost of new equipment. Developing a wire-saw process and transferring the process to production; as a result, more than 80… more
Date: June 16, 1999
Creator: Wohlgemuth, J.
Item Type: Refine your search to only Report
open access

Characterization of damage evolution in an AM60 magnesium alloy by computed tomography

Description: Lawrence Livermore National Lab and Sandia National Laboratories, CA are collaborating on the development of new techniques to study damage evolution and growth in material specimens subjected to mechanical loading. These techniques include metallography, radiography, computed tomography (CT) and modeling. The material specimens being studied include cast magnesium and aluminum alloys, and forged stainless steel. The authors concentrate on characterizing monotonically loaded Mg alloy specimens … more
Date: June 16, 1999
Creator: Waters, A.; Green, R.E.; Martz, H.; Dolan, K.; Horstemeyer, M. & Derrill, R.
Item Type: Refine your search to only Article
open access

Characterization of phase assemblage and distribution in titanate ceramics with SEM/EDS and x-ray mapping.

Description: Titanate ceramics have been selected for the immobilization of excess plutonium. The baseline ceramic formulation leads to a multi-phase assemblage, which consists of a majority pyrochlore phase plus secondary phases. The phase distribution depends on processing conditions and impurity loading. In this paper, we report on the characterization of the phase assemblage and distribution in titanate ceramics using scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), and x-… more
Date: June 16, 1999
Creator: Luo, J. S.
Item Type: Refine your search to only Article
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