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1-D Van der Waals Foams Heated by Ion Beam Energy Deposition
One dimensional simulations of various initial average density aluminum foams (modeled as slabs of solid metal separated by low density regions) heated by volumetric energy deposition are conducted with a Lagrangian hydrodynamics code using a van der Waals equation of state (EOS). The resulting behavior is studied to facilitate the design of future warm dense matter (WDM) experiments at LBNL. In the simulations the energy deposition ranges from 10 to 30 kJ/g and from 0.075 to 4.0 ns total pulse length, resulting in temperatures from approximately 1 to 4 eV. We study peak pressures and temperatures in the foams, expansion velocity, and the phase evolution. Five relevant time scales in the problem are identified. Additionally, we present a method for characterizing the level of inhomogeneity in a foam target as it is heated and the time it takes for a foam to homogenize.
Date:
March 19, 2010
Creator:
Zylstra, A; Barnard, J J & More, R M
Object Type:
Article
System:
The UNT Digital Library
1-D Van der Waals Foams Heated by Ion Beam Energy Deposition
One dimensional simulations of various initial average density aluminum foams (modeled as slabs of solid metal separated by low density regions) heated by volumetric energy deposition are conducted with a Lagrangian hydrodynamics code using a van der Waals equation of tate (EOS). The resulting behavior is studied to facilitate the design of future warm dense matter (WDM) experiments at LBNL. In the simulations the energy deposition ranges from 10 to 30 kJ/g and from 0.075 to 4.0 ns total pulse length, resulting in temperatures from approximately 1 o 4 eV. We study peak pressures and temperatures in the foams, expansion velocity, and the phase evolution. Five relevant time scales in the problem are identified. Additionally, we present a method for characterizing the level of inhomogeneity in a foam target as it is heated and the time it takes for a foam to homogenize.
Date:
December 23, 2009
Creator:
Zylstra, A. B.; Barnard, J. J. & More, R. M.
Object Type:
Article
System:
The UNT Digital Library
1: Redox chemistry of bimetallic fulvalene complexes; 2: Oligocyclopentadienyl complexes
The electrochemistry of the heterobimetallic complexes (fulvalene)WFe(CO){sub 5} (30) and (fulvalene)WRu(CO){sub 5} (31) has been investigated. Compound 30 is reduced in two one-electron processes, and this behavior was exploited synthetically to prepare a tetranuclear dimer by selective metal reduction. Complex 31 displayed a distinction between the metals upon reoxidation of the dianion, allowing the formation of a dimer by selective metal anion oxidation. The redox behavior of 30 led to an investigation of the use of electrocatalysis to effect metal-specific ligand substitution. It was found that reduction of 30 with a catalytic amount of CpFe(C{sub 6}Me{sub 6}) (97) in the presence of excess P(OMe){sub 3} or PMe{sub 3} led to the formation of the zwitterions (fulvalene)[W(CO){sub 3}{sup {minus}}][Fe(CO)PR{sub 3}{sup +}] (107, R = P(OMe){sub 3}; 108, R = PMe{sub 3}). Compound 31 also displayed unique behavior with different reducing agents, as the monosubstituted zwitterion (fulvalene)[W(CO){sub 3}{sup {minus}}][Ru(CO){sub 2}(PMe{sub 3}){sup +}] was obtained when 97 was used while the disubstituted complex (fulvalene) [W(CO){sub 3}{sup {minus}}] [Ru(CO)(PMe{sub 3}){sub 2}{sup +}] was produced when Cp*Fe(C{sub 6}Me{sub 6}) was the catalyst. Potential synthetic routes to quatercyclopentadienyl complexes were also explored. Various attempts to couple heterobimetallic fulvalene compounds proved to be unsuccessful. 138 refs.
Date:
November 1, 1993
Creator:
Brown, D. S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
1 to 2 GeV/c beam line for hypernuclear and kaon research
A kaon beam line operating in the range from 1.0 to 2.0 GeV/c is proposed. The line is meant for kaon and pion research in a region hitherto inaccessible to experimenters. Topics in hypernuclear and kaon physics of high current interest include the investigation of doubly strange nuclear systems with the K/sup -/,K/sup +/ reaction, searching for dibaryon resonances, hyperon-nucleon interactions, hypernuclear ..gamma.. rays, and associated production of excited hypernuclei. The beam line would provide separated beams of momentum analyzed kaons at intensities greater than 10/sup 6/ particles per spill with a momentum determined to one part in a thousand. This intensity is an order of magnitude greater than that currently available. 63 references.
Date:
February 15, 1985
Creator:
Chrien, R. E.
Object Type:
Report
System:
The UNT Digital Library
(4+2)-Cycloaddition Reactions of Ketenes; Pyranones
This study deals with the (4+2)-cycloaddition reactions of 4-π electron compounds with ketenes. Chloroketenes were generated in situ from the corresponding chlorinated acid chlorides in the presence of the ketenophiles. Chloro-, dichloro- and diphenylketenes reacted with 1-methoxy-3-trimethylsiloxy-l,3-butadiene, and 2,4-bis(trimethylsiloxy)-1,3-pentadiene to yield the corresponding dihydropyrans. The dihydropyrans yielded substituted 4-pyranones on hydrolysis.
Date:
August 1983
Creator:
Agho, Michael O. (Michael Osarenogowu)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 2, Ed. 1 Monday, April 18, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 18, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 3, Ed. 1 Monday, April 25, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 25, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 6, Ed. 1 Monday, May 16, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 16, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 7, Ed. 1 Monday, May 23, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 23, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 8, Ed. 1 Monday, May 30, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 30, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 14, Ed. 1 Monday, July 11, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 11, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 22, Ed. 1 Monday, September 5, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 5, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 25, Ed. 1 Monday, September 26, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 26, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 29, Ed. 1 Monday, October 24, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 24, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 31, Ed. 1 Monday, November 7, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 7, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 4, Ed. 1 Monday, May 1, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 1, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 12, Ed. 1 Monday, June 26, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 26, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 16, Ed. 1 Monday, July 24, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 24, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 17, Ed. 1 Monday, July 31, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 31, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 18, Ed. 1 Monday, August 7, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 7, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 22, Ed. 1 Monday, September 4, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 4, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 38, Ed. 1 Monday, December 25, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 25, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
8. annual U.S. hydrogen meeting: Proceedings
The proceedings contain 35 papers arranged under the following topical sections: Government`s partnership role for hydrogen technology development; Government/industry partnerships -- Demonstrations; Entering the market -- Partnerships in transportation; Hydrogen -- The aerospace fuel; Codes and Standards; Advanced technologies; and Opportunities for partnerships in the utility market. Of the three markets identified (transportation, power production, and village power) papers are presented dealing with the first two. Three parts of the transportation market were covered: cars, trucks, and buses. Progress was reported in both fuel cell and internal combustion engine vehicle propulsion systems. Selected papers have been indexed separately for inclusion in the Energy Science and Technology Database.
Date:
January 1997
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
9-Lipoxygenase Oxylipin Pathway in Plant Response to Biotic Stress
The activity of plant 9-lipoxygenases (LOXs) influences the outcome of Arabidopsis thaliana interaction with pathogen and insects. Evidence provided here indicates that in Arabidopsis, 9-LOXs facilitate infestation by Myzus persicae, commonly known as the green peach aphid (GPA), a sap-sucking insect, and infection by the fungal pathogen Fusarium graminearum. in comparison to the wild-type plant, lox5 mutants, which are deficient in a 9-lipoxygenase, GPA population was smaller and the insect spent less time feeding from sieve elements and xylem, thus resulting in reduced water content and fecundity of GPA. LOX5 expression is induced rapidly in roots of GPA-infested plants. This increase in LOX5 expression is paralleled by an increase in LOX5-synthesized oxylipins in the root and petiole exudates of GPA-infested plants. Micrografting experiments demonstrated that GPA population size was smaller on plants in which the roots were of the lox5 mutant genotype. Exogenous treatment of lox5 mutant roots with 9-hydroxyoctadecanoic acid restored water content and population size of GPA on lox5 mutants. Together, these results suggest that LOX5 genotype in roots is critical for facilitating insect infestation of Arabidopsis. in Arabidopsis, 9-LOX function is also required for facilitating infection by F. graminearum, which is a leading cause of Fusarium head …
Date:
May 2012
Creator:
Nalam, Vamsi J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library