UNT Libraries Government Documents Department - 257 Matching Results

Search Results

Results: 1 - 24 next
open access

(129)Xe NMR of Mesoporous Silicas

Description: The porosities of three mesoporous silica materials were characterized with {sup 129}Xe NMR spectroscopy. The materials were synthesized by a sol-gel process with r = 0, 25, and 70% methanol by weight in an aqueous cetyltrimethylammonium bromide solution. Temperature dependent chemical shifts and spin lattice relaxation times reveal that xenon does not penetrate the pores of the largely disordered (r= 70%) silica. For both r = 0 and 25%, temperature dependent resonances corresponding to physiso… more
Date: April 23, 1999
Creator: Anderson, M.T.; Asink, R.A.; Kneller, J.M. & Pietrass, T.
Item Type: Refine your search to only Article
open access

1999 Leak Detection and Monitoring and Mitigation Strategy Update

Description: This document is a complete revision of WHC-SD-WM-ES-378, Rev 1. This update includes recent developments in Leak Detection, Leak Monitoring, and Leak Mitigation technologies, as well as, recent developments in single-shell tank retrieval technologies. In addition, a single-shell tank retrieval release protection strategy is presented.
Date: September 23, 1999
Creator: Ohl, Phil
Item Type: Refine your search to only Report
open access

29th Annual PolyMAC Meeting: Book of Abstracts

Description: A sixteen-run, Resolution IV, fractional factorial screening design has been used to evaluate the relative significance of seven independent material and process variables for an electrically deposited commercial acrylic paint. A Resolution IV design was chosen so that variable interactions could be detected without any interference from the effects of the variables themselves. Because resource limitations did not permit use of a Resolution V design, the two-way interactions were confounded wit… more
Date: July 23, 1999
Creator: Balazs, B.
Item Type: Refine your search to only Report
open access

2nd Generation PFBC Systems R&D Phase 2 AND Phase 3

Description: No work was performed; the two remaining Multi Annular Swirl Burner test campaigns are on hold pending selection of a new test facility (replacement for the shut down UTSI burner test facility) and identification of associated testing costs. The Second-Generation PFB Combustion Plant conceptual design prepared in 1987 is being updated to reflect the benefit of pilot plant test data and the latest advances in gas turbine technology. The updated plant is being designed to operate with 95 percent … more
Date: December 23, 1999
Creator: Robertson, Archie
Item Type: Refine your search to only Report
open access

Acceptable Knowledge Summary Report for Waste Stream: SR-T001-221F-HET/Drums

Description: Since beginning operations in 1954, the Department of Energy's Savannah River Site FB-Line conducted atomic energy defense activities consistent with the listing in Section 10101(3) of the Nuclear Waste Policy Act of 1982. The facility mission was to process and convert dilute plutonium solution into highly purified weapons grade plutonium metal. As a result of various activities conducted in support of the mission (e.g., operation, maintenance, repair, clean up, and facility modifications), th… more
Date: August 23, 1999
Creator: Lunsford, G.F.
Item Type: Refine your search to only Report
open access

Activation and Micropore Structure Determination of Activated Carbon-Fiber Composites

Description: Previous work focused on the production of carbon fiber composites and subsequently activating them to induce adsorbent properties. One problem related to this approach is the difficulty of uniformly activating large composites. In order to overcome this problem, composites have been made from pre-activated fibers. The loss of surface area upon forming the composites after activation of the fibers was investigated. The electrical resistivity and strength of these composites were compared to tho… more
Date: April 23, 1999
Creator: Jagtoyen, M. & Derbyshire, F.
Item Type: Refine your search to only Report
open access

Advisor 2.0: A Second-Generation Advanced Vehicle Simulator for Systems Analysis

Description: The National Renewable Energy Laboratory has recently publicly released its second-generation advanced vehicle simulator called ADVISOR 2.0. This software program was initially developed four years ago, and after several years of in-house usage and evolution, the tool is now available to the public through a new vehicle systems analysis World Wide Web page. ADVISOR has been applied to many different systems analysis problems, such as helping to develop the SAE J1711 test procedure for hybrid ve… more
Date: March 23, 1999
Creator: Wipke, K.; Cuddy, M.; Bharathan, D.; Burch, S.; Johnson, V.; Markel, A. et al.
Item Type: Refine your search to only Report
open access

Aerosol-Assisted Self-Assembly of Mesostructured Spherical Nanoparticles

Description: Nanostructured particles exhibiting well-defined pore sizes and pore connectivities (1-, 2-, or 3-dimensional) are of interest for catalysis, chromatography, controlled release, low dielectric constant fillers, and custom-designed pigments and optical hosts. During the last several years considerable progress has been made on controlling the macroscopic forms of mesoporous silicas prepared by surfactant and block copolymer liquid crystalline templating procedures. Typically interfacial phenomen… more
Date: March 23, 1999
Creator: Lu, Yunfeng; Fan, Hongyou; Stump, Aaron; Ward, Timothy, L.; Rieker, Thomas & Brinker, C. Jeffrey
Item Type: Refine your search to only Article
open access

Alternative Fuel News, Vol. 3 No. 2

Description: This special issue of Alternative Fuel News highlights the Fifth National Clean Cities Conference held in Louisville, Kentucky. The momentum for the program is stronger than ever and the coalitions are working to propel the alternative fuel industry forward.
Date: September 23, 1999
Item Type: Refine your search to only Book
open access

Amorphization of Laves-Phase Precipitates in Zircaloy-4 by Neutron Irradiation

Description: Examination of corrosion coupons by transmission electron microscopy after their exposure in the Idaho Advanced Test Reactor (ATR) has broadened the Zircaloy-4 precipitate-amorphization database and validated a new kinetic model for previously unavailable values of temperature and fast-neutron flux. The model describes the amorphization of Zr(Fe,Cr){sub 2} intermetallic precipitates in zirconium alloys as a dynamic competition between radiation damage and thermal annealing that leaves some iron… more
Date: April 23, 1999
Creator: Peters, H. R.; Taylor, D. F. & Yang, Walter J. S.
Item Type: Refine your search to only Article
open access

Analysis, comparison, and modeling of radar interferometry, date of surface deformation signals associated with underground explosions, mine collapses and earthquakes. Phase I: underground explosions, Nevada Test Site

Description: We have previously presented simple elastic deformation modeling results for three classes of seismic events of concern in monitoring the CTBT--underground explosions, mine collapses and earthquakes. Those results explored the theoretical detectability of each event type using synthetic aperture radar interferometry (InSAR) based on commercially available satellite data. In those studies we identified and compared the characteristics of synthetic interferograms that distinguish each event type,… more
Date: July 23, 1999
Creator: Foxall, W; Vincent, P & Walter, W
Item Type: Refine your search to only Article
open access

Analysis of the Interaction of Short-Pulse High-Fluence Radiation with Targets

Description: We generally use large-scale hydrocodes to study the dynamic response of targets to influence pulsed radiation loads. However, for many applications where the desired solution does not require a detailed specification of pressure- or velocity-time histories, there are simple analytic approaches that can yield surprisingly accurate results. Examples include determining either the final velocity of a radiation-driven flying plate or the impulse delivered to a structural element. These methods are… more
Date: July 23, 1999
Creator: Lawrence, R.Jeffery
Item Type: Refine your search to only Article
open access

AntiReflection Coating D

Description: Analytical expressions used to optimize AR coatings for single junction solar cells are extended for use in monolithic, series interconnected multi-junction solar cell AR coating design. The result is an analytical expression which relates the solar cell performance (through J{sub sc}) directly to the AR coating design through the device reflectance. It is also illustrated how AR coating design be used to provide an additional degree of freedom for current matching multi-junction devices.
Date: September 23, 1999
Creator: AIKEN,DANIEL J.
Item Type: Refine your search to only Article
open access

An Apparatus for the Direct Measurement of Collimator Transverse Wakefields

Description: The design of the NLC Beam Delivery System requires a firmer understanding of the effects of collimators on short, intense bunches than is presently available. We describe an experiment to directly measure these effects through use of a dedicated apparatus located at the 1.19 GeV point in the SLAC Linac. The apparatus consists of an outer vacuum vessel and an interchangeable insertion containing up to 5 distinct collimator apertures. The insertion is capable of remote-controlled translation, al… more
Date: April 23, 1999
Creator: Tenenbaum, Peter G
Item Type: Refine your search to only Report
open access

Application of ''Confirm tank T is an appropriate feed source for High-Level waste feed batch X'' to specific feed batches

Description: This document addresses the characterization needs of tanks as set forth in the Data Quality Objectives for TWRS Privatization Phase I: Confirm Tank T is an Appropriate Feed Source for High-Level Waste Feed Batch X (Crawford et al. 1998). The primary purpose of this document is to collect existing data and identify the data needed to determine whether or not the feed source(s) are appropriate for a specific batch. To answer these questions, the existing tank data must be collected and a detaile… more
Date: February 23, 1999
Creator: JO, J.
Item Type: Refine your search to only Report
open access

Application of ''Confirm tank T is an appropriate feed source for Low-Activity waste feed batch X'' to specific feed batches

Description: This document addresses the characterization needs of tanks as set forth in the ''Confirm Tank T is an Appropriate Feed Source for Low-Activity Waste Feed Batch X'' Data Quality Objective (DQO) (Certa and Jo 1998). The primary purpose of this document is to collect existing data and identify the data needed to determine whether or not the feed source(s) are appropriate for a specific batch before transfer is made to the feed staging tanks. To answer these questions, the existing tank data must … more
Date: February 23, 1999
Creator: JO, J.
Item Type: Refine your search to only Report
open access

Application of the Pegasus II Pulsed-Power Facility to the Study of Inertial Instability and Fracture of Cylindrical Tubes of Solid Aluminum

Description: Understanding the surface stability of metals undergoing dynamic fracture at shock breakout is important to several applications in metals processing. The advantages of using the Pegasus II facility to investigate the phenomena occurring at shock break out are described. As an example of the data collected, we concentrate on brief descriptions of two experiments that compared the tensile failure, i.e. ''spall'', patterns in the presence of sinusoidal perturbations seeded on the free inner surfa… more
Date: June 23, 1999
Creator: Chandler, E. A.; Stokes, J.; Fulton, R. D.; Morgan, D. V.; Obst, A. W.; Oro, D. M. et al.
Item Type: Refine your search to only Report
open access

The Ascension Island hydroacoustic experiment: purpose, data set features and plans for future analysis

Description: Calibration of hydroacoustic and T-phase stations for Comprehensive Nuclear-Test-Ban Treaty (CTBT) monitoring will be an important element in establishing new operational stations and upgrading existing stations. Calibration of hydroacoustic stations is herein defined as precision location of the hydrophones and determination of the amplitude response from a known source energy. T-phase station calibration is herein defined as a determination of station site attenuation as a function of frequen… more
Date: July 23, 1999
Creator: Harben, P E; Rock, D & Rodgers, A J
Item Type: Refine your search to only Article
open access

Authorization basis for the 209-E Building

Description: This Authorization Basis document is one of three documents that constitute the Authorization Basis for the 209-E Building. Per the U.S. Department of Energy, Richland Operations Office (RL) letter 98-WSD-074, this document, the 209-E Building Preliminary Hazards Analysis (WHC-SD-WM-TI-789), and the 209-E Building Safety Evaluation Report (97-WSD-074) constitute the Authorization Basis for the 209-E Building. This Authorization Basis and the associated controls and safety programs will remain i… more
Date: February 23, 1999
Creator: TIFFANY, M.S.
Item Type: Refine your search to only Report
open access

Ballistic Experiments with Titanium and Aluminum Targets

Description: During the course of the project we conducted two sets of fundamental experiments in penetration mechanics in the LLNL Terminal Ballistics Laboratory of the Physics Directorate. The first set of full-scale experiments was conducted with a 14.5mm air propelled launcher. The object of the experiments was to determine the ballistic limit speed of 6Al-4V-alloy titanium, low fineness ratio projectiles centrally impacting 2024-T3 alloy aluminum flat plates and the failure modes of the projectiles and… more
Date: November 23, 1999
Creator: Gogolewski, R. & Morgan, B. R.
Item Type: Refine your search to only Report
open access

The beamline for the second axis of the dual axis radiographic hydrodynamic test facility

Description: During normal DARHT II operation, the beam exiting the accelerator will be well characterized by its nominal design parameters of 20-MeV, 2000-Amperes, 2-{micro}sec-pulse length, and 3 cm-mr unnormalized emittance. Normal operation will have the beam delivered to a beam dump via several DC magnets. A 2-way kicker magnet is used to deflect portions of the beam into the straight ahead beamline leading to either a diagnostic beamline or to the converter target beamline. During start up and or beam… more
Date: March 23, 1999
Creator: Caporaso, G. J.; Chen, Y. J.; Fawley, W. M.; Lee, E. P.; Paul, A. C. & Westenkow, G.
Item Type: Refine your search to only Article
Back to Top of Screen