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5,850 Matching Results

Start Over Decade 2000-2009 Day 3rd

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Results: 1 - 24 of 5,850 next

(open access)

A MOBILE MELT-DILUTE MODULE FOR THE TREATMENT OF ALUMINUM RESEARCH REACTOR SPENT FUEL

A mobile melt-dilute (MMD) module for the treatment of aluminum research reactor spent fuel is being developed jointly by the Savannah River National Laboratory and Argonne National Laboratory. The process uses a closed system approach to retain fission products/gases inside a sealed canister after treatment. The MMD process melts and dilutes spent fuel with depleted uranium to obtain an isotopic content of less than 20 percent. The final ingot is solidified inside the sealed canister and can be stored safely either wet or dry until final disposition or reprocessing. The MMD module can be staged at or near the research reactor fuel storage sites to facilitate the melt-dilute treatment of the spent fuel into a stable non-proliferable form.

Date: November 3, 2004

Creator: ADAMS, THAD

Object Type: Article

System: The UNT Digital Library

(open access)

Significance of Soft Zone Sediments at the SRS

The purpose of this report is to provide information on the origin, extent and stability of ''soft zones'' in the carbonate bearing strata at the Savannah River Site (SRS). As part of this study, a comprehensive historical compendium of how soft zones have been addressed during the past 47 years at SRS is reviewed.

Date: February 3, 2000

Creator: Aadland, R. K.

Object Type: Report

System: The UNT Digital Library

(open access)

RadHeat V1 User's Manual

RadHeat is a one dimensional finite difference heat transfer code that can determine the transient temperature evolution of layered targets in pulsed penetrating radiation environments. It makes use of energy dependent opacity and stopping data to model the volumetric deposition of any number of photon or ion spectra each incident at arbitrary angles. Convective and radiative boundary conditions are handled as well as the ability to impose any initial temperature profile. The heat diffusion equation is formulated implicitly to eliminate timestep dependent stability issues. Simulations are, therefore, able to achieve high fidelity during times of thermal activity and greater speed elsewhere. The prototypical physical situation simulated by RadHeat is illustrated. RadHeat was originally written to study the temperature response of tungsten-armored target-facing walls to the pulsed photon and ion radiation emanating from fusion microexplosions in future IFE power plants. RadHeat's implementation is quite general, though, and the code can be applied to a very broad range of problems. Anything from the heating of the Earth's crust on a warm summer day to the temperature rise in a mirror after a laser pulse could potentially be modeled. This manual was written to help new users learn how to run the code …

Date: January 3, 2005

Creator: Abbott, R P

Object Type: Text

System: The UNT Digital Library

(open access)

Linear Collider Physics Resource Book for Snowmass 2001

The American particle physics community can look forward to a well-conceived and vital program of experimentation for the next ten years, using both colliders and fixed target beams to study a wide variety of pressing questions. Beyond 2010, these programs will be reaching the end of their expected lives. The CERN LHC will provide an experimental program of the first importance. But beyond the LHC, the American community needs a coherent plan. The Snowmass 2001 Workshop and the deliberations of the HEPAP subpanel offer a rare opportunity to engage the full community in planning our future for the next decade or more. A major accelerator project requires a decade from the beginning of an engineering design to the receipt of the first data. So it is now time to decide whether to begin a new accelerator project that will operate in the years soon after 2010. We believe that the world high-energy physics community needs such a project. With the great promise of discovery in physics at the next energy scale, and with the opportunity for the uncovering of profound insights, we cannot allow our field to contract to a single experimental program at a single laboratory in the world. …

Date: May 3, 2001

Creator: Abe, T.; Dawson, S.; Heinemeyer, S.; Marciano, W.; Paige, F.; Turcot, A. S. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Electric Transmission: Approaches for Energizing a Sagging Industry

This report discusses factors that have contributed to the lack of new transmission capacity and some of the resulting issues.

Date: October 3, 2007

Creator: Abel, Amy

Object Type: Report

System: The UNT Digital Library

(open access)

2006 Electrochemistry Gordon Research Conference - February 12-17-2006

This report is a descriptive journey of 2006 Electrochemistry Gordon Research Conference.

Date: April 3, 2007

Creator: Abruna, Hector D.

Object Type: Article

System: The UNT Digital Library

(open access)

Vehicular Storage of Hydrogen in Insulated Pressure Vessels

This paper describes the development of an alternative technology for storing hydrogen fuel onboard automobiles. Insulated pressure vessels are cryogenic-capable pressure vessels that can accept cryogenic liquid fuel, cryogenic compressed gas or compressed gas at ambient temperature. Insulated pressure vessels offer advantages over conventional H{sub 2} storage approaches. Insulated pressure vessels are more compact and require less carbon fiber than GH{sub 2} vessels. They have lower evaporative losses than LH{sub 2} tanks, and are much lighter than metal hydrides. After outlining the advantages of hydrogen fuel and insulated pressure vessels, the paper describes the experimental and analytical work conducted to verify that insulated pressure vessels can be used safely for vehicular H{sub 2} storage. The paper describes tests that have been conducted to evaluate the safety of insulated pressure vessels. Insulated pressure vessels have successfully completed a series of DOT, ISO and SAE certification tests. A draft procedure for insulated pressure vessel certification has been generated to assist in a future commercialization of this technology. An insulated pressure vessel has been installed in a hydrogen fueled truck and it is currently being subjected to extensive testing.

Date: January 3, 2005

Creator: Aceves, S. M.; Berry, G. D.; Martinez-Frias, J. & Espinosa-Loza, F.

Object Type: Article

System: The UNT Digital Library

(open access)

Performance and Certification Testing of Insulated Pressure Vessels for Vehicular Hydrogen Storage

Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH2) or ambient-temperature compressed hydrogen (CH2). 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 be safely used to store liquid hydrogen. The use of commercially available pressure vessels significantly reduces the cost and complexity of the insulated pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped vessels to evaluate the damage caused by low temperature operation. All analysis and experiments to date indicate that no significant damage has resulted. Required future tests are described that will prove that no technical barriers exist to the safe use of aluminum-fiber vessels at cryogenic temperatures. Future activities also include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for obtaining certification for insulated pressure vessels.

Date: June 3, 2001

Creator: Aceves, S. M.; Martinez-Frias, J.; Garcia-Villazana, O. & Espinosa-Loza, F.

Object Type: Article

System: The UNT Digital Library

(open access)

U-Th/He age of phenocrystic garnet from the 79AD eruption of Mt. Vesuvius

None

Date: November 3, 2003

Creator: Aciego, Sarah; Kennedy, B. M.; DePaolo, Donald J.; Christensen, John N. & Hutcheon, Ian

Object Type: Article

System: The UNT Digital Library

(open access)

A Fundamental Study of Dispersed Multiphase Flows at Small Scales

The purpose of the research supported by this grant was two-fold: I, to continue our earlier studies on the rheology of suspensions of non-colloidal particles; and, II, to study the transport of a nano-sized particle through a fluid-filled nano-channel using molecular dynamics simulations. In I, we investigated, by means of Stokesian Dynamics simulations, the dynamics of concentrated suspensions and discovered that their statistical properties could be described, even for particle concentrations up to 20%, by means of an analytical theory of pair-particle interactions, provided that pair-doublets are assumed to be totally absent. We also provided a quantitative explanation of the fascinating banding phenomenon of particle axial segregation which was observed when a suspension of neutrally buoyant particles was sheared in a partially filled horizontal Couette device or in a rotating horizontal cylinder. In II, independently of the shape and the relative size of the particle, we find two distinct regimes as a function of the degree of wetting, with a sharp transition between them. Specifically, in a highly wetting suspending fluid, the particle moves through the cylinder with an average axial velocity in agreement with that obtained from the solution of the continuum Stokes equations. In contrast, in the case …

Date: May 3, 2005

Creator: Acrivos, Andreas; Khusid, Boris & Koplik, Joel

Object Type: Report

System: The UNT Digital Library

(open access)

Micromilling of Metal Alloys with Focused Ion Beam-Fabricated Tools

None

Date: October 3, 2000

Creator: Adams, D.P.; Vasile, M.J.; Benavides, G.L. & Campbell, A.N.

Object Type: Article

System: The UNT Digital Library

(open access)

Atomic Line Shapes in the Presence of an External Magnetic Field

Both the theoretical basis and computational approach for extending the capabilities of a spectral line broadening code are presented. Following standard line broadening theory, the effects of an external magnetic field are incorporated into the atomic Hamiltonian and plasma average. In the presence of an external magnetic field the atomic Hamiltonian angular properties are altered--atomic energy levels are perturbed and the spectral emission line is polarized. The magnetic field introduces a preferential axis that changes the plasma average. These extensions have been incorporated into a new spectral line broadening code that is applied to several problems of importance to the understanding of tokamak edge plasmas. Applications fall into two broad categories: (1) determination of local plasma properties from distinct line shape features; and (2) consideration of global plasma phenomenon, such as radiation transport. Observable features of the Zeeman effect make H{sub {alpha}} a good magnetic field diagnostic. H{sub {beta}} does not make a good electron density diagnostic since the Zeeman effect is comparable to the Stark effect for a majority of tokamak edge plasma conditions. When optically thick lines exist the details of the spectral line shapes are shown to significantly influence the transport of radiation throughout the system.

Date: July 3, 2002

Creator: Adams, M L; Lee, R W; Scott, H A; Chung, H K & Klein, L

Object Type: Article

System: The UNT Digital Library

(open access)

Confirmatory Survey Results for the Emergency Operations Facility (EOF) at the Connecticut Yankee Haddam Neck Plant, Haddam, Connecticut

The U.S. Nuclear Regulatory Commission (NRC) requested that the Oak Ridge Institute for Science and Education (ORISE) perform a confirmatory survey on the Emergency Operations Facility (EOF) at the Connecticut Yankee Haddam Neck Plant (HNP) in Haddam, Connecticut

Date: July 3, 2007

Creator: Adams, W. C.

Object Type: Report

System: The UNT Digital Library

(open access)

DEMONSTRATION OF SIMULATED WASTE TRANSFERS FROM TANK AY-102 TO THE HANFORD WASTE TREATMENT FACILITY

In support of Hanford's AY-102 Tank waste certification and delivery of the waste to the Waste Treatment and Immobilization Plant (WTP), Savannah River National Laboratory (SRNL) was tasked by the Washington River Protection Solutions (WRPS) to evaluate the effectiveness of mixing and transferring the waste in the Double Shell Tank (DST) to the WTP Receipt Tank. This work is a follow-on to the previous 'Demonstration of Internal Structures Impacts on Double Shell Tank Mixing Effectiveness' task conducted at SRNL 1. The objective of these transfers was to qualitatively demonstrate how well waste can be transferred out of a mixed DST tank and to provide insights into the consistency between the batches being transferred. Twelve (12) different transfer demonstrations were performed, varying one parameter at a time, in the Batch Transfer Demonstration System. The work focused on visual comparisons of the results from transferring six batches of slurry from a 1/22nd scale (geometric by diameter) Mixing Demonstration Tank (MDT) to six Receipt Tanks, where the consistency of solids in each batch could be compared. The simulant used in this demonstration was composed of simulated Hanford Tank AZ-101 supernate, gibbsite particles, and silicon carbide particles, the same simulant/solid particles used in the …

Date: December 3, 2009

Creator: Adamson, D.; Poirier, M. & Steeper, T.

Object Type: Report

System: The UNT Digital Library

(open access)

The Eastern Statesman (Wilburton, Okla.), Vol. 81, No. 9, Ed. 1 Monday, February 3, 2003

Biweekly student newspaper from Eastern Oklahoma State College in Wilburton, Oklahoma that includes local, state, and campus news along with advertising.

Date: February 3, 2003

Creator: Agent, Alicia

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

Supercritical Stability, Transitions, and (Pseudo)tachyons

Highly supercritical strings (c >> 15) with a time-like linear dilaton provide a large class of solutions to string theory, in which closed string tachyon condensation is under control (and follows the worldsheet renormalization group flow). In this note we analyze the late-time stability of such backgrounds, including transitions between them. The large friction introduced by the rolling dilaton and the rapid decrease of the string coupling suppress the back-reaction of naive instabilities. In particular, although the graviton, dilaton, and other light fields have negative effective mass squared in the linear dilaton background, the decaying string coupling ensures that their condensation does not cause large back-reaction. Similarly, the copious particles produced in transitions between highly supercritical theories do not back-react significantly on the solution. We discuss these features also in a somewhat more general class of time-dependent backgrounds with stable late-time asymptotics.

Date: January 3, 2007

Creator: Aharony, Ofer & Silverstein, Eva

Object Type: Article

System: The UNT Digital Library

(open access)

Trade and the Americas

None

Date: January 3, 2003

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

U.S.-Thailand Free Trade Agreement Negotiations

Report on the trade agreements between the United States and Thailand, including commercial relations, intellectual property rights, and more.

Date: November 3, 2005

Creator: Ahearn, Raymond J. & Morrison, Wayne M.

Object Type: Report

System: The UNT Digital Library

(open access)

Snapping Supernovae at z>1.7

We examine the utility of very high redshift Type Ia supernovae for cosmology and systematic uncertainty control. Next generation space surveys such as the Supernova/Acceleration Probe (SNAP) will obtain thousands of supernovae at z>1.7, beyond the design redshift for which the supernovae will be exquisitely characterized. We find that any z gtrsim 2 standard candles' use for cosmological parameter estimation is quite modest and subject to pitfalls; we examine gravitational lensing, redshift calibration, and contamination effects in some detail. The very high redshift supernovae - both thermonuclear and core collapse - will provide copious interesting information on star formation, environment, and evolution. However, the new observational systematics that must be faced, as well as the limited expansion of SN-parameter space afforded, does not point to high value for 1.7<z<3 SNe Ia in controlling evolutionary systematics relative to what SNAP can already achieve at z<1.7. Synergy with observations from JWST and thirty meter class telescopes afford rich opportunities for advances throughout astrophysics.

Date: July 3, 2006

Creator: Aldering, Greg; Kim, Alex G.; Kowalski, Marek; Linder, Eric V. & Perlmutter, Saul

Object Type: Article

System: The UNT Digital Library