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Insulated Pressure Vessels for Vehicular Hydrogen Storage: Analysis and Performance Evaluation

Description: Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH{sub 2}) or ambient-temperature compressed hydrogen (CH{sub 2}). Insulated pressure vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The work described here is directed at verifying that commercially available pressure vessels can… more
Date: June 26, 2001
Creator: Aceves, S. M.; Martinez-Frias, J.; Garcia-Villazana, O. & Espinosa-Loza, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A nanocrystal strain gauge for luminescence detection of mechanical forces

Description: Local microscale stresses play a crucial role in inhomogeneous mechanical processes from cell motility to material failure. However, it remains difficult to spatially resolve stress at these small length scales. While contact-probe and non-contact based techniques have been used to quantify local mechanical behavior in specific systems with high stiffness or stress and spatial resolution, these methods cannot be used to study a majority of micromechanical systems due to spectroscopic and geomet… more
Date: July 26, 2010
Creator: Choi, Charina; Koski, Kristie; Olson, Andrew & Alivisatos, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Hypothesis of the Magnetostatic Turbulence and its Implications for Astrophysics

Description: Arguments are presented in favor of a possible existence of a random, force-free magnetic field. Ponderomotive forces in such a field are small, and the evolutionary time is much longer than Alfven crossing time over the vortex scale, whence the suggested term ''magnetostatic''. The presence of this long-lived random magnetic field provides stiffness with respect to large-scale compressional motions. On the other hand, such a field cannot be detected by techniques involving line-of-sight averag… more
Date: February 26, 2007
Creator: Ryutov, D. D. & Remington, B. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Progress on the National Ignition Facility

Description: The National Ignition Facility (NIF) is a 192 beam Nd-glass laser facility presently under construction at LLNL. When completed, NIF will produce 1.8 MJ, 500 TW of ultraviolet light making it the world's largest and most powerful laser system. NIF will be the world's preeminent facility for performing experiments for Inertial Confinement Fusion (ICF) and High Energy Density Science (HEDS). The Project, begun in 1995, is over 80% complete. The building and the beam path are essentially complete.… more
Date: September 26, 2005
Creator: Moses, Edward
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Office of River Protection Mission Completion Strategy

Description: DOE's Office of River Protection (ORP) is readying itself to commence construction of a Waste Treatment Plant (WTP) that will start the process of turning Hanford tank waste into glass. The plant is state-of-the art and includes reasonable flexibility to improve operations as technology and operational understandings improve. During its 40 year design life the plant has the capability to treat half of the total volume of tank waste and reduce risk to the public by up to ninety percent. Looking … more
Date: February 26, 2002
Creator: Wiegman, S. A.; Hewitt, W. M.; Yuracko, K. & Holbrook, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multi-project baselines for potential clean development mechanism projects in the electricity sector in South Africa

Description: The United Nations Framework Convention on Climate Change (UNFCCC) aims to reduce emissions of greenhouse gases (GHGs) in order to ''prevent dangerous anthropogenic interference with the climate system'' and promote sustainable development. The Kyoto Protocol, which was adopted in 1997 and appears likely to be ratified by 2002 despite the US withdrawing, aims to provide means to achieve this objective. The Clean Development Mechanism (CDM) is one of three ''flexibility mechanisms'' in the Proto… more
Date: June 26, 2002
Creator: Winkler, H.; Spalding-Fecher, R.; Sathaye, J. & Price, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An Illustration of the Corrective Action Process, The Corrective Action Management Unit at Sandia National Laboratories/New Mexico

Description: Corrective Action Management Units (CAMUs) were established by the Environmental Protection Agency (EPA) to streamline the remediation of hazardous waste sites. Streamlining involved providing cost saving measures for the treatment, storage, and safe containment of the wastes. To expedite cleanup and remove disincentives, EPA designed 40 CFR 264 Subpart S to be flexible. At the heart of this flexibility are the provisions for CAMUs and Temporary Units (TUs). CAMUs and TUs were created to remove… more
Date: February 26, 2002
Creator: Irwin, M. & Kwiecinski, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low Floor Americans with Disabilities Compliant Alternate Fuel Vehicle Project

Description: This project developed a low emission, cost effective, fuel efficient, medium-duty community/transit shuttle bus that meets American's with Disabilities Act (ADA) requirements and meets National Energy Policy Act requirements (uses alternative fuel). The Low Profile chassis, which is the basis of this vehicle is configured to be fuel neutral to accommodate various alternative fuels. Demonstration of the vehicle in Yellowstone Park in summer (wheeled operation) and winter (track operation) demon… more
Date: November 26, 2004
Creator: Bartel, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Soft X-ray techniques to study mesoscale magnetism

Description: Heterogeneity in magnetization (M) is ubiquitous in modern systems. Even in nominally homogeneous materials, domains or pinning centers typically mediate magnetization reversal. Fundamental lengths determining M structure include the domain wall width and the exchange stiffness length, typically in the 4-400 nm range. Chemical heterogeneity (phase separation, polycrystalline microstructure, lithographic or other patterning, etc.) with length scales from nanometers to microns is often introduced… more
Date: June 26, 2003
Creator: Kortright, Jeffrey B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Explosive Effectiveness Capability (ExEC)

Description: Gaining accurate predictions of damage inflicted by high explosive devices is vital in order to minimize collateral damage effects on a target. ExEC provides a means for conducting very detailed analysis of weapons effects on targets for advanced mission planning purposes. ExEC is composed of a suite of high fidelity physics codes, which have been used for decades by the nuclear weapons laboratories for assessing high explosive, thermal, and structural effects. The ExEC capability should not be… more
Date: July 26, 2000
Creator: Nakafuji, G.; Daily, L. & Leake, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

OCH Strap Model Test

Description: The OCH Model was stacked using the appropriate spacers between each absorber plate. Steel bars measuring 3-inch wide by 1/4-inch thick were welded, using 1/8-inch fillet weld, along all the corner edges, except the outer radius edges. On the outer radius, the straps were bolted to the end plates and to plates 9 and 17. The straps on the outer radius were also set in towards the center by approximately 3-inches. The spacers were then knocked out. Twelve strain gauges were mounted on the model. … more
Date: August 26, 1987
Creator: Weber, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimizing the Dynamic Aperture for Triple Bend Achromatic Lattices.

Description: The Triple Bend Achromatic (TBA) lattice has the potential for lower natural emittance per period than the Double Bend Achromatic (DBA) lattice for high brightness light sources. However, the DBA has been chosen for 3rd generation light sources more often due to the higher number of undulator straight section available for a comparable emittance. The TBA has considerable flexibility in linear optics tuning while maintaining this emittance advantage. We have used the tune and chromaticity flexib… more
Date: June 26, 2006
Creator: Kramer, S. L. & Bengtsson, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improvements in the MGA Code Provide Flexibility and Better Error Analysis

Description: The Multi-Group Analysis (MGA) code is widely used to determine nondestructively the relative isotopic abundances of plutonium by gamma-ray spectrometry. MGA users have expressed concern about the lack of flexibility and transparency in the code. Users often have to ask the code developers for modifications to the code to accommodate new measurement situations, such as additional peaks being present in the plutonium spectrum or expected peaks being absent. We are testing several new improvement… more
Date: May 26, 2005
Creator: Ruhter, W D & Kerr, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An algebraic sub-structuring method for large-scale eigenvaluecalculation

Description: We examine sub-structuring methods for solving large-scalegeneralized eigenvalue problems from a purely algebraic point of view. Weuse the term "algebraic sub-structuring" to refer to the process ofapplying matrix reordering and partitioning algorithms to divide a largesparse matrix into smaller submatrices from which a subset of spectralcomponents are extracted and combined to provide approximate solutions tothe original problem. We are interested in the question of which spectralcomponentsone… more
Date: May 26, 2004
Creator: Yang, C.; Gao, W.; Bai, Z.; Li, X.; Lee, L.; Husbands, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Real Time Pricing and the Real Live Firm

Description: Energy economists have long argued the benefits of real time pricing (RTP) of electricity. Their basis for modeling customers response to short-term fluctuations in electricity prices are based on theories of rational firm behavior, where management strives to minimize operating costs and optimize profit, and labor, capital and energy are potential substitutes in the firm's production function. How well do private firms and public sector institutions operating conditions, knowledge structures, … more
Date: May 26, 2004
Creator: Moezzi, Mithra; Goldman, Charles; Sezgen, Osman; Bharvirkar, Ranjit & Hopper, Nicole
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

National Nuclear Security Administration Service Center Environmental Programs Long-Term Environmental Stewardship Baseline Handbook

Description: As environmental restoration (ER) projects move toward completion, the planning, integration, and documentation of long-term environmental stewardship (LTES) activities is increasingly important for ensuring smooth transition to LTES. The Long-Term Environmental Stewardship Baseline Handbook (Handbook) prepared by the National Nuclear Security Administration (NNSA) Service Center Environmental Programs Department (EPD) outlines approaches for integrating site-specific LTES planning and implemen… more
Date: February 26, 2003
Creator: Griswold, D. D. & Rohde, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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