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Modeling Free Convection Flow of Liquid Hydrogen within a Cylindrical Heat Exchanger Cooled to 14 K
None
Date:
May 8, 2004
Creator:
Green, Michael A.; Yang, S. W.; Green, M. A. & Lau, W.
Object Type:
Article
System:
The UNT Digital Library
Modeling Free Convection Flow of Liquid Hydrogen within a Cylindrical Heat Exchanger Cooled to 14 K
A liquid hydrogen in a absorber for muon cooling requires that up to 300 W be removed from 20 liters of liquid hydrogen. The wall of the container is a heat exchanger between the hydrogen and 14 K helium gas in channels within the wall. The warm liquid hydrogen is circulated down the cylindrical walls of the absorber by free convection. The flow of the hydrogen is studied using FEA methods for two cases and the heat transfer coefficient to the wall is calculated. The first case is when the wall is bare. The second case is when there is a duct some distance inside the cooled wall.
Date:
May 8, 2004
Creator:
Green, Michael A.; Yang, S. W.; Green, M. A. & Lau, W.
Object Type:
Article
System:
The UNT Digital Library
Comments on Shimony's 'An Analysis of Stapp's 'A bell-type theoremwithout hidden variables''
The hidden-variable theorems of Bell and followers depend upon an assumption, namely the hidden-variable assumption, that conflicts with the precepts of quantum philosophy. Hence from an orthodox quantum perspective those theorems entail no faster-than-light transfer of information. They merely reinforce the ban on hidden variables. The need for some sort of faster-than-light information transfer can be shown by using counterfactuals instead of hidden variables. Shimony's criticism of that argument fails to take into account the distinction between no-faster-than-light connection in one direction and that same condition in both directions. The argument can be cleanly formulated within the framework of a fixed past, open future interpretation of quantum theory, which neatly accommodates the critical assumptions that the experimenters are free to choose which experiments they will perform. The assumptions are compatible with the Tomonaga-Schwinger formulation of quantum field theory, and hence with orthodox quantum precepts, and with the relativistic requirement that no prediction pertaining to an outcome in one region can depend upon a free choice made in a region spacelike-separated from the first.
Date:
September 8, 2004
Creator:
Stapp, Henry P.
Object Type:
Article
System:
The UNT Digital Library
Transition to Turbulence and Effect of Initial Conditions on 3D Compressible Mixing in Planar Blast-wave-driven Systems
Perturbations on an interface driven by a strong blast wave grow in time due to a combination of Rayleigh-Taylor, Richtmyer-Meshkov, and decompression effects. In this paper, results from three-dimensional numerical simulations of such a system under drive conditions to be attainable on the National Ignition Facility [E. M. Campbell, Laser Part. Beams, 9(2), 209 (1991)] are presented. Using the multi-physics, adaptive mesh refinement, higher order Godunov Eulerian hydrocode, Raptor [L. H. Howell and J.A. Greenough, J. Comp. Phys. 184, 53 (2003)], the late nonlinear instability evolution, including transition to turbulence, is considered for various multimode perturbation spectra. The 3D post-transition state differs from the 2D result, but the process of transition proceeds similarly in both 2D and 3D. The turbulent mixing transition results in a reduction in the growth rate of the mixing layer relative to its pre-transition value and, in the case of the bubble front, relative to the 2D result. The post-transition spike front velocity is approximately the same in 2D and 3D. Implications for hydrodynamic mixing in core-collapse supernova are discussed.
Date:
November 8, 2004
Creator:
Miles, A R; Edwards, M J & Greenough, J A
Object Type:
Article
System:
The UNT Digital Library
Use of Conducting Polymers for Electronic Communication with Redox Active Nanoparticles
Nanoscale materials provide unique properties that will enable new technologies and enhance older ones. One area of intense activity in which nanoscale materials are being used is in the development of new functional materials for battery applications.1-4 This effort promises superior materials with properties that circumvent many of the problems associated with traditional battery materials. Previously we have worked on several approaches for using nanoscale materials for application as cathode materials in rechargeable Li batteries.5-11 Our recent work has focused on synthesizing MnO2 nanoparticles and using conducting polymers to electronically address these particles in nanoparticle assemblies. This presentation will focus on those efforts. MnO2 nanoparticles that are encapsulated with poly(3,4-ethylenedioxythiophene) (PEDOT) are prepared using 3,4-ethylenedioxythiophene (EDOT) as a chemical reductant for permanganate anion. This non-aqueous preparation is based on a recent report of a similar method for preparation of PEDOT-encapsulated Au nanoparticles.12 We also describe the synthesis of MnO2 colloidal nanoparticles prepared using an aqueous route involving reduction of permanganate anion with butanol using a previously described route.13 We report the synthesis and characterization of the PEDOT material, and the aqueous colloidal material. We show that the aqueous colloidal nanoparticles can be trapped in thin films using a layer-by-layer deposition …
Date:
August 8, 2004
Creator:
Bazito, Fernanda; O'Brien, Robert & Buttry, Daniel A.
Object Type:
Article
System:
The UNT Digital Library
Defects in p-GaN and their atomic structure
In this paper defects formed in p-doped GaN:Mg grown with Ga polarity will be discussed. The atomic structure of these characteristic defects (Mg-rich hexagonal pyramids and truncated pyramids) in bulk and thin GaN:Mg films grown with Ga polarity was determined at atomic resolution by direct reconstruction of the scattered electron wave in a transmission electron microscope. Small cavities were present inside the defects. The inside walls of the cavities were covered by GaN which grew with reverse polarity compared to the matrix. It was proposed that lateral overgrowth of the cavities restores matrix polarity on the defect base. Exchange of Ga and N sublattices within the defect compared to the matrix lead to a 0.6 {+-} 0.2 {angstrom} displacement between the Ga sublattices of these two areas. A [1{und 1}00]/3 shift with change from AB stacking in the matrix to BC within the entire pyramid is observed
Date:
October 8, 2004
Creator:
Liliental-Weber, Z.; Tomaszewicz, T.; Zakharov, D.; Jasinski, J. & and O'Keefe, M.
Object Type:
Article
System:
The UNT Digital Library
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron
Heightened biological activity was observed in February 1996in the high-nutrient low-chlorophyll (HNLC) subarctic North PacificOcean, a region that is thought to beiron-limited. Here we provideevidence supporting the hypothesis that Ocean Station Papa (OSP) in thesubarctic Pacific received a lateral supply of particulate iron from thecontinental margin off the Aleutian Islands in the winter, coincidentwith the observed biological bloom. Synchrotron X-ray analysis was usedto describe the physical form, chemistry, and depth distributions of ironin size fractionated particulate matter samples. The analysis revealsthat discrete micron-sized iron-rich hotspots are ubiquitous in the upper200m at OSP, more than 900km from the closest coast. The specifics of thechemistry and depth profiles of the Fe hot spots trace them to thecontinental margins. We thus hypothesize that iron hotspots are a markerfor the delivery of iron from the continental margin. We confirm thedelivery of continental margin iron to the open ocean using an oceangeneral circulation model with an iron-like tracer source at thecontinental margin. We suggest that iron from the continental marginstimulated a wintertime phytoplankton bloom, partially relieving the HNLCcondition.
Date:
June 8, 2004
Creator:
Lam, Phoebe J.; Bishop, James K.B.; Henning, Cara C.; Marcus,Matthew A.; Waychunas, Glenn A. & Fung, Inez
Object Type:
Article
System:
The UNT Digital Library
[Email from Caro Bosca, Dec. 8, 2004]
Email letter-head from Caro Bosca that includes all the email addresses the unattached message was sent to.
Date:
December 8, 2004
Creator:
Bosca, Caro Bayley
Object Type:
Letter
System:
The Portal to Texas History
[Letter from Eleanor Brown to Elaine, October 8, 2004]
Letter from Eleanor Brown to Elaine discussing her volunteer activities, recent travel, and other news.
Date:
October 8, 2004
Creator:
Brown, Eleanor McLernon
Object Type:
Letter
System:
The Portal to Texas History
Mannford Eagle (Mannford, Okla.), Vol. 23, No. 31, Ed. 1 Wednesday, December 8, 2004
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 8, 2004
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 42, Ed. 1 Wednesday, December 8, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 8, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 29, Ed. 1 Wednesday, September 8, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
September 8, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 34, No. 1, Ed. 1 Wednesday, September 8, 2004
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
September 8, 2004
Creator:
Dickens, Jodi
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 34, No. 12, Ed. 1 Wednesday, December 8, 2004
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
December 8, 2004
Creator:
Dickens, Jodi
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0247
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether a county auditor may approve a claim for payment on a contract that was not awarded in compliance with the County Purchasing Act (RQ-0195-GA)
Date:
September 8, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0278
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification: Whether constitutional authorization of video lottery terminals on Indian tribal lands would permit Indian tribal lands would permit Indian tribes to offer casino gambling in Texas (RQ-0214-GA)
Date:
December 8, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
[Man holding piece of fried chicken and cardboard box]
Photograph of a man at a restaurant packing fried chicken into a yellow cardboard box. Several other cardboard boxes are visible in front of the man and three other employees are partially shown standing behind him.
Date:
December 8, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Man grasping fried chicken with metal tongs]
Photograph of a man at a restaurant serving fried chicken with a metal tong. The man is wearing a polo t-shirt and a hat with the text "Pollo Campero".
Date:
December 8, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Man picking up fried chicken with metal tongs]
Photograph of a man picking up fried chicken with metal tongs to place them into the box on his left hand. The man is wearing a white polo shirt and a hat with the text "Pollo Campero".
Date:
December 8, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
The Rambler (Fort Worth, Tex.), Vol. 92, No. 2, Ed. 1 Wednesday, September 8, 2004
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
September 8, 2004
Creator:
Fowler, Whitney
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0176
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether article XI, section 7 of the Texas Constitution bars a county from agreeing to indemnify an appraisal district for the costs of litigation arising from the appraisal district's performance of 9-1-1 services for the county (RQ-0122-GA)
Date:
April 8, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Motor Carrier Safety: Oversight and Reauthorization Legislation
None
Date:
June 8, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ballast Water Management to Combat Invasive Species
This report is on Ballast Water Management to Combat Invasive Species.
Date:
April 8, 2004
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
Oman: Current Issues and U.S. Policy
None
Date:
July 8, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library