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[TAMS alumni at 2008 UNT Homecoming]
A photograph of the TAMS alumni at their reunion and reception during the 2008 UNT Homecoming. They are gathered behind the large 'TAMS' standing letters for their group picture. The reception tent is behind them and there are balloons decorating it.
Date:
October 25, 2008
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
MM-Wave Cavity/Klystron Developments Using Deep X-Ray Lithography at the Advanced Photon Source
Recent microfabrication technologies based on LIGA (German acronym for Lithographe, Galvanoformung, und Abformung) have been applied to build high-aspect-ratio, metallic or dielectric, planar structures suitable for high-frequency rf cavity structures. The cavity structures would be used as parts of linear accelerators, microwave undulators, and mm-wave amplifiers. The microfabrication process includes manufacturing of precision x-ray masks, exposure of positive resist by x-rays through the mask, resist development, and electroforming of the final microstructure. Prototypes of a 32-cell, 108-GHz constant impedance cavity and a 66-cell, 94-GHz constant-gradient cavity were fabricated using the synchrotron radiation sources at APS. Preliminary design parameters for a 91-GHz modulator klystron along with an overview of the new technology are discussed.
Date:
October 25, 2006
Creator:
Song, J. J.; Kang, Y. W.; Kustom, R. L.; Mancini, D. C.; Nassiri, A.; Lai, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Reactivity of Resorcinol Formaldehyde Resin with Nitric Acid
Solid-state infrared spectroscopy, differential scanning calorimetry, and elemental analysis have been used to evaluate the reactivity of resorcinol formaldehyde resin with nitric acid and characterize the solid product. Two distinct reactions were identified within the temperature range 25-55 C. The first reaction is primarily associated with resin nitration, while the second involves bulk oxidation and degradation of the polymer network leading to dissolution and off-gassing. The threshold conditions promoting reaction have been identified. Reaction was confirmed with nitric acid concentrations as low as 3 M at 25 C applied temperature and 0.625 M at 66 C. Although a nitrated resin product can be isolated under appropriate experimental conditions, calorimetry testing indicates no significant hazard associated with handling the dry material.
Date:
October 25, 2005
Creator:
King, William D.; Fondeur, Fernando F.; Wilmarth, William R. & Pettis, Myra E.
Object Type:
Article
System:
The UNT Digital Library
April 25, 2003, FY2003 Progress Summary and FY2002 Program Plan, Statement of Work and Deliverables for Development of High Average Power Diode-Pumped Solid State Lasers,and Complementary Technologies, for Applications in Energy and Defense
The High Average Power Laser Program (HAPL) is a multi-institutional, synergistic effort to develop inertial fusion energy (IFE). This program is building a physics and technology base to complement the laser-fusion science being pursued by DOE Defense programs in support of Stockpile Stewardship. The primary institutions responsible for overseeing and coordinating the research activities are the Naval Research Laboratory (NRL) and Lawrence Livermore National Laboratory (LLNL). The current LLNL proposal is a companion document to the one submitted by NRL, for which the driver development element is focused on the krypton fluoride excimer laser option. The NRL and LLNL proposals also jointly pursue complementary activities with the associated rep-rated laser technologies relating to target fabrication, target injection, final optics, fusion chamber, target physics, materials and power plant economics. This proposal requests continued funding in FY03 to support LLNL in its program to build a 1 kW, 100 J, diode-pumped, crystalline laser, as well as research into high gain fusion target design, fusion chamber issues, and survivability of the final optic element. These technologies are crucial to the feasibility of inertial fusion energy power plants and also have relevance in rep-rated stewardship experiments. The HAPL Program pursues technologies needed for laser-driven …
Date:
October 25, 2005
Creator:
Meier, W & Bibeau, C
Object Type:
Report
System:
The UNT Digital Library
Galactic Diffuse Emissions
Interactions of cosmic rays with interstellar nucleons and photons make the Milky Way a bright, diffuse source of high-energy {gamma}-rays. Observationally, the results from EGRET, COMPTEL, and OSSE have now been extended to higher energies by ground-based experiments, with detections of diffuse emission in the Galactic center reported by H.E.S.S. in the range above 100 GeV and of diffuse emission in Cygnus by MILAGRO in the TeV range. In the range above 100 keV, INTEGRAL SPI has found that diffuse emission remains after point sources are accounted for. I will summarize current knowledge of diffuse {gamma}-ray emission from the Milky Way and review some open issues related to the diffuse emission -- some old, like the distribution of cosmic-ray sources and the origin of the 'excess' of GeV emission observed by EGRET, and some recently recognized, like the amount and distribution of molecular hydrogen not traced by CO emission -- and anticipate some of the advances that will be possible with the Large Area Telescope on GLAST. We plan to develop an accurate physical model for the diffuse emission, which will be useful for detecting and accurately characterizing emission from Galactic point sources as well as any Galactic diffuse emission …
Date:
October 25, 2007
Creator:
Digel, Seth W.
Object Type:
Article
System:
The UNT Digital Library
Mobility of Tritium in Engineered and Earth Materials at the NuMIFacility, Fermilab: Progress report for work performed between June 13and September 30, 2006
This report details the work done between June 13 andSeptember 30, 2006 by Lawrence Berkeley National Laboratory (LBNL)scientists to assist Fermi National Accelerator Laboratory (Fermilab)staff in understanding tritium transport at the Neutrino at the MainInjector (NuMI) facility. As a byproduct of beamline operation, thefacility produces (among other components) tritium in engineeredmaterials and the surrounding rock formation. Once the tritium isgenerated, it may be contained at the source location, migrate to otherregions within the facility, or be released to theenvironment.
Date:
October 25, 2006
Creator:
Pruess, Karsten; Conrad, Mark; Finsterle, Stefan; Kennedy, Mack; Kneafsey, Timothy; Salve, Rohit et al.
Object Type:
Report
System:
The UNT Digital Library
A Multi-Layer Phoswich Radioxenon Detection System, Reporting Period 07/01/07 - 09/30/07
During this quarter, the detector manufacturer (Saint-Gobain) delivered one side of the prototype two-channel phoswich detector (XEPHWICH). Once received, our Digital Pulse Processor (DPP1, 12-bit/100 MHz) was employed to capture and digitally process phoswich pulses from laboratory radioactive sources. Our previous pulse shape discrimination algorithm was modified by utilizing three trapezoidal digital filters. This algorithm provides a two-dimensional plot in which the pulse shapes of interest are classified and then can be well identified. The preliminary experimental results will be presented at the 2007 Informal Xenon Monitoring Workshop. The DPP2 (two-channel, 12-bit/ 250 MHz Digital Pulse Processor) is at the prototyping stage. The analog sections have been designed, prototyped and tested. A 6-layer Printed Circuit Board (PCB) was designed, ordered and delivered. The board components were ordered and are now being assembled and examined for proper functionality. In addition, the related FPGA hardware description code (using VHDL) is under development and simulation. Additionally, our researchers have been studying materials regarding wavelet transforms for incorporation into the project. Wavelet transform is an interesting tool for signal processing; one use for our purpose would be to de-noise the detector signal and to express the signal in a few coefficients for signal compression …
Date:
October 25, 2007
Creator:
Hamby, David M.
Object Type:
Report
System:
The UNT Digital Library
Hadronic Cross-Sections for Neutrino Production in MIPP
Hadronic Cross Sections for Neutrino Production in MIPP
Date:
October 25, 2005
Creator:
Paley, Jonathan
Object Type:
Presentation
System:
The UNT Digital Library
The Structure and Dynamics of GRB Jets
There are several lines of evidence which suggest that the relativistic outflows in gamma-ray bursts (GRBs) are collimated into narrow jets. The jet structure has important implications for the true energy release and the event rate of GRBs, and can constrain the mechanism responsible for the acceleration and collimation of the jet. Nevertheless, the jet structure and its dynamics as it sweeps up the external medium and decelerates, are not well understood. In this review I discuss our current understanding of GRB jets, stressing their structure and dynamics.
Date:
October 25, 2006
Creator:
Granot, Jonathan
Object Type:
Article
System:
The UNT Digital Library
Confirmatory Survey Results for the Reactor Building Dome Upper Surfaces, Rancho Saco Nuclear Generating Station
Results from a confirmatory survey of the upper structural surfaces of the Reactor Building Dome at the Rancho Seco Nuclear Generating Station (RSNGS) performed by the Oak Ridge Institute for Science and Education for the NRC. Also includes results of interlaboratory comparison analyses on several archived soil samples that would be provided by RSNGS personnel. The confirmatory surveys were performed on June 7 and 8, 2006.
Date:
October 25, 2006
Creator:
Adams, Wade C.
Object Type:
Report
System:
The UNT Digital Library
Online Aerosol Mass Spectrometry of Single Micrometer-Sized Particles Containing Poly(ethylene glycol)
Analysis of poly(ethylene glycol)(PEG)-containing particles by online single particle aerosol mass spectrometers equipped with laser desorption ionization (LDI) is reported. We demonstrate that PEG-containing particles are useful in the development of aerosol mass spectrometers because of their ease of preparation, low cost, and inherently recognizable mass spectra. Solutions containing millimolar quantities of PEGs were nebulized and, after drying, the resultant micrometer-sized PEG containing particles were sampled. LDI (266 nm) of particles containing NaCl and PEG molecules of average molecular weight <500 generated mass spectra reminiscent of mass spectra of PEG collected by other MS schemes including the characteristic distribution of positive ions (Na{sup +} adducts) separated by the 44 Da of the ethylene oxide units separating each degree of polymerization. PEGs of average molecular weight >500 were detected from particles that also contained t the tripeptide tyrosine-tyrosine-tyrosine or 2,5-dihydroxybenzoic acid, which were added to nebulized solutions to act as matrices to assist LDI using pulsed 266 nm and 355 nm lasers, respectively. Experiments were performed on two aerosol mass spectrometers, one reflectron and one linear, that each utilize two time-of-flight mass analyzers to detect positive and negative ions created from a single particle. PEG-containing particles are currently being employed in …
Date:
October 25, 2006
Creator:
Bogan, M J; Patton, E; Srivastava, A; Martin, S; Fergenson, D; Steele, P et al.
Object Type:
Article
System:
The UNT Digital Library
Hadronic Tau Decays at BaBar
Precision measurements of the exclusive branching fraction {tau}{sup -} {yields} K{sup -}{pi}{sup 0}{nu}{sub {tau}} and {tau}{sup -} {yields} h{sup -}h{sup -}h{sup +}{nu}{sub {tau}}, where the h represent either a pion or a kaon, from the BABAR Experiment are presented. The branching fraction for {tau}{sup -} {yields} K{sup -}K{sup -}K{sup +}{nu}{sub {tau}} is the first resonant plus non-resonant measurement of this mode and the branching fraction {tau}{sup -} {yields} {phi}{pi}{sup -}{nu}{sub {tau}} is also a first measurement. In addition we present the new measurement of the branching fraction of {tau}{sup -} {yields} {phi}K{sup -}{nu}{sub {tau}}.
Date:
October 25, 2007
Creator:
Nugent, I. M.
Object Type:
Article
System:
The UNT Digital Library
Evolution of Intermediate and Low Mass Binary Systems
There are a number of binaries, fairly wide and with one or even two evolved giant components, that do not agree very well with conventional stellar evolution: the secondaries are substantially larger (oversized) than they should be because their masses are quite low compared with the primaries. I discuss the possibility that these binaries are former triples, in which a merger has occurred fairly recently in a short-period binary sub-component. Some mergers are expected, and may follow a phase of contact evolution. I suggest that in contact there is substantial transfer of luminosity between the components due to differential rotation, of the character observed by helioseismology in the Sun's surface convection zone.
Date:
October 25, 2005
Creator:
Eggleton, P P
Object Type:
Article
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 59, No. 23, Ed. 1 Wednesday, October 25, 2006
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
October 25, 2006
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
A Sealed, UHV Compatible, Soft X-ray Detector Utilizing Gas Electron Multipliers
An advanced soft X-ray detector has been designed and fabricated for use in synchrotron experiments that utilize X-ray absorption spectroscopy in the study a wide range of materials properties. Fluorescence X-rays, in particular C{sub K} at 277eV, are converted in a low pressure gas medium, and charge multiplication occurs in two gas electron multipliers, fabricated in-house from glass reinforced laminate, to enable single photon counting. The detector satisfies a number of demanding characteristics often required in synchrotron environments, such as UHV compatibility compactness, long-term stability, and energy resolving capability.
Date:
October 25, 2009
Creator:
Schaknowski, N.A. & Smith, G.
Object Type:
Article
System:
The UNT Digital Library
Seminole Sentinel (Seminole, Tex.), Vol. 98, No. 5, Ed. 1 Wednesday, October 25, 2006
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 25, 2006
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 43, Ed. 1 Thursday, October 25, 2007
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2007
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 3, Ed. 1 Wednesday, October 25, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Mount Vernon Optic-Herald (Mount Vernon, Tex.), Vol. 127, No. 12, Ed. 1 Thursday, October 25, 2001
Weekly newspaper from Mount Vernon, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2001
Creator:
Bush-Reves, Lillie
Object Type:
Newspaper
System:
The Portal to Texas History
Lexington Observer (Lexington, Okla.), Vol. 12, No. 25, Ed. 1 Thursday, October 25, 2007
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 25, 2007
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Polk County Enterprise (Livingston, Tex.), Vol. 127, No. 88, Ed. 1 Sunday, October 25, 2009
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
October 25, 2009
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 114, No. 43, Ed. 1 Wednesday, October 25, 2006
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 26, Ed. 1 Thursday, October 25, 2007
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2007
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 119, No. 85, Ed. 1 Thursday, October 25, 2001
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
October 25, 2001
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History