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Very High Pressure Single Pulse Shock Tube Studies of Aromatic Species
The principal focus of this research program is aimed at understanding the oxidation and pyrolysis chemistry of primary aromatic molecules and radicals with the goal of developing a comprehensive kinetic model at conditions that are relevant to practical combustion devices. A very high pressure single pulse shock tube is used to obtain experimental data over a wide pressure range in the high pressure regime, 5-1000 bars, at pre-flame temperatures for fuel pyrolysis and oxidation over a broad spectrum of equivalence ratios. Stable species sampled from the shock tube are analyzed using standard chromatographic techniques using GC/MS-PDD and GC/TCD-FID. Experimental data from the HPST (stable species profiles) and data from other laboratories (if available) are simulated using kinetic models (if available) to develop a comprehensive model that can describe aromatics oxidation and pyrolysis over a wide range of experimental conditions. The shock tube has been heated (1000C) recently to minimize effects due to condensation of aromatic, polycyclic and other heavy species. Work during this grant period has focused on 7 main areas summarized in the final technical report.
Date:
November 28, 2006
Creator:
Brezinsky, K.
Object Type:
Report
System:
The UNT Digital Library
Weapons of Mass Destruction: Trade Between North Korea and Pakistan
In October 2002, the United States confronted North Korea about its alleged clandestine uranium enrichment program. Soon after, the Agreed Framework collapsed, North Korea expelled international inspectors, and withdrew from the Nuclear Nonproliferation Treaty (NPT). U.S. intelligence officials claimed Pakistan was a key supplier of uranium enrichment technology to North Korea, and some media reports suggested that Pakistan had exchanged centrifuge enrichment technology for North Korean help in developing longer range missiles.
Date:
November 28, 2006
Creator:
Squassoni, Sharon A.
Object Type:
Report
System:
The UNT Digital Library
20-MW Magnicon for ILC
The 1.3 GHz RF power to drive ILC is now planned to be supplied by 600-1200, 10-MW peak power multi-beam klystrons. In this project, a conceptual design for 1.3 GHz magnicons with 20 MW peak power was developed as an alternative to the klystrons, with the possibility of cutting in half the numbers of high-power tubes and associated components. Design of a conventional magnicon is described, using TM110 modes in all cavities, as well as design of a modified magnicon with a TE111 mode output cavity. The latter has the advantage of much lower surface fields than the TM110 mode, with no loss of output power or electronic efficiency.
Date:
November 29, 2006
Creator:
Hirshfield, Jay L.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 108, No. 208, Ed. 1 Wednesday, November 29, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 4, Ed. 1 Wednesday, November 29, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 29, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
A Cassette Based System for Hydrogen Storage and Delivery
A hydrogen storage system is described and evaluated. This is based upon a cassette, that is a container for managing hydrogen storage materials. The container is designed to be safe, modular, adaptable to different chemistries, inexpensive, and transportable. A second module receives the cassette and provides the necessary infrastructure to deliver hydrogen from the cassette according to enduser requirements. The modular concept has a number of advantages over approaches that are all in one stand alone systems. The advantages of a cassette based system are discussed, along with results from model and laboratory testing.
Date:
November 29, 2006
Creator:
E., Britton Wayne
Object Type:
Report
System:
The UNT Digital Library
Central Energy System Modernization at Fort Jackson, South Carolina
An evaluation of technology options was conducted for the central energy systems at Fort Jackson, South Carolina. There were two objectives in conducting this study. From a broader viewpoint, the Army would like to develop a systematic approach to management of its central energy systems and selected Fort Jackson for this ''pilot'' study for a prospective Central Energy System Modernization Program. From a site-specific perspective, the objective was to identify the lowest life-cycle cost energy supply option(s) at Fort Jackson for buildings currently served by central boilers and chillers. This study was co-funded by the Army's Southeast Region and the U.S. Department of Energy's Federal Energy Management Program.
Date:
November 29, 2006
Creator:
Brown, Daryl R.; Chvala, William D. & Dirks, James A.
Object Type:
Report
System:
The UNT Digital Library
Chemical reaction rates using the semiclassical Van-Vleck initialvalue representation
A semiclassical IVR formulation using the Van-Vleck propagator has been used to calculate the flux correlation function and thereby reaction rate constants. This Van-Vleck formulation of the flux-flux correlation function is computationally as simple as the classical Wigner model. However unlike the latter, it has the ability to capture quantum interference/coherence effects. Classical trajectories are evolved starting from the dividing surface that separates reactants and products, and are evolved negatively in time. This formulation has been tested on model problems ranging from the Eckart barrier, double well to the collinear H + H{sub 2}.
Date:
November 29, 2006
Creator:
Venkataraman, Charulatha & Miller, William H.
Object Type:
Article
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 41, Ed. 1 Wednesday, November 29, 2006
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 29, 2006
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 111, No. 48, Ed. 1 Wednesday, November 29, 2006
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 29, 2006
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Collegian (Hurst, Tex.), Vol. 19, No. 12, Ed. 1 Wednesday, November 29, 2006
Weekly student newspaper published in Hurst, Texas serving the Tarrant County College District that includes school news and information along with advertising.
Date:
November 29, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 25, No. 43, Ed. 1 Wednesday, November 29, 2006
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
November 29, 2006
Creator:
Crimmins, Blaine
Object Type:
Newspaper
System:
The Portal to Texas History
Comparison of kinetic and equilibrium reaction models insimulating gas hydrate behavior in porous media
In this study we compare the use of kinetic and equilibriumreaction models in the simulation of gas (methane) hydrate behavior inporous media. Our objective is to evaluate through numerical simulationthe importance of employing kinetic versus equilibrium reaction modelsfor predicting the response of hydrate-bearing systems to externalstimuli, such as changes in pressure and temperature. Specifically, we(1) analyze and compare the responses simulated using both reactionmodels for natural gas production from hydrates in various settings andfor the case of depressurization in a hydrate-bearing core duringextraction; and (2) examine the sensitivity to factors such as initialhydrate saturation, hydrate reaction surface area, and numericaldiscretization. We find that for large-scale systems undergoing thermalstimulation and depressurization, the calculated responses for bothreaction models are remarkably similar, though some differences areobserved at early times. However, for modeling short-term processes, suchas the rapid recovery of a hydrate-bearing core, kinetic limitations canbe important, and neglecting them may lead to significantunder-prediction of recoverable hydrate. The use of the equilibriumreaction model often appears to be justified and preferred for simulatingthe behavior of gas hydrates, given that the computational demands forthe kinetic reaction model far exceed those for the equilibrium reactionmodel.
Date:
November 29, 2006
Creator:
Kowalsky, Michael B. & Moridis, George J.
Object Type:
Article
System:
The UNT Digital Library
Comparison of kinetic and equilibrium reaction models insimulating the behavior of porous media
In this study we compare the use of kinetic and equilibriumreaction models in the simulation of gas (methane) hydrate behavior inporous media. Our objective is to evaluate through numerical simulationthe importance of employing kinetic versus equilibrium reaction modelsfor predicting the response of hydrate-bearing systems to externalstimuli, such as changes in pressure and temperature. Specifically, we(1) analyze and compare the responses simulated using both reactionmodels for natural gas production from hydrates in various settings andfor the case of depressurization in a hydrate-bearing core duringextraction; and (2) examine the sensitivity to factors such as initialhydrate saturation, hydrate reaction surface area, and numericaldiscretization. We find that for large-scale systems undergoing thermalstimulation and depressurization, the calculated responses for bothreaction models are remarkably similar, though some differences areobserved at early times. However, for modeling short-term processes, suchas the rapid recovery of a hydrate-bearing core, kinetic limitations canbe important, and neglecting them may lead to significantunder-prediction of recoverable hydrate. Assuming validity of the mostaccurate kinetic reaction model that is currently available, the use ofthe equilibrium reaction model often appears to be justified andpreferred for simulating the behavior of gas hydrates, given that thecomputational demands for the kinetic reaction model far exceed those forthe equilibrium reaction model.
Date:
November 29, 2006
Creator:
Kowalsky, Michael B. & Moridis, George J.
Object Type:
Article
System:
The UNT Digital Library
[Dallas National Bank Deposit Receipt and Summary]
Deposit receipt and summary of $175.00 made on November 30, 2006. Included is a letter from Bryan W. Gerard from Al Daniels on June 26, 2006, discussing membership fees ending on November 20, 2006.
Date:
November 29, 2006
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Energy: Selected Facts and Numbers
None
Date:
November 29, 2006
Creator:
Glover, Carol & Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2006-11-29 – Repertoire Orchestra
Access:
Use of this item is restricted to the UNT Community
Repertoire Orchestra concert performed at the UNT College of Music Concert Hall
Date:
November 29, 2006
Creator:
University of North Texas. Repertoire Orchestra.
Object Type:
Sound
System:
The UNT Digital Library
Evidence for Merging or Disruption of Red Galaxies from the Evolution of Their Clustering
The formation and evolution of massive red galaxies form a crucial test of theories of galaxy formation based on hierarchical assembly. In this Letter we use observations of the clustering of luminous red galaxies from the Boötes field and N-body simulations to argue that about of the most luminous satellite galaxies appear to undergo merging or disruption within massive halos between and 0.5.
Date:
November 29, 2006
Creator:
White, Martin; White, Martin; Zheng, Zheng; Brown, Michael J. I.; Dey, Arjun & Jannuzi, Buell T.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, November 29, 2006
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 2006
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Funeral Program for Hazel E. Walker, November 29, 2006]
Funeral program for Hazel E. Walker, born September 17, 1927 and died November 23, 2006. The funeral was held November 29, 2006 at the Calvary Baptist Church, officiated by Rev. Kevin Nelson. Funeral arrangements were made through Sutton-Sutton Mortuary, and he was buried in Meadowlawn Memorial Park in San Antonio, Texas.
Date:
November 29, 2006
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Generalized System of Preferences Renewal: Agricultural Imports
None
Date:
November 29, 2006
Creator:
Johnson, Renée
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 112, No. 21, Ed. 1 Wednesday, November 29, 2006
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 29, 2006
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 30, No. 232, Ed. 1 Wednesday, November 29, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
November 29, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 508, Ed. 1 Wednesday, November 29, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
November 29, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History