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An LTCC 94 GHz Antenna Array
An antenna array is designed in low-temperature cofired ceramic (LTCC) Ferro A6M{trademark} for a mm-wave application. The antenna is designed to operate at 94 GHz with a few percent bandwidth. A key manufacturing technology is the use of 3 mil diameter vias on a 6 mil pitch to construct the laminated waveguides that form the beamforming network and radiating elements. Measurements for loss in the laminated waveguide are presented. The slot-fed cavity-radiating element is designed to account for extremely tight mutual coupling between elements. The array incorporates a slot-fed multi-layer beamforming network.
Date:
December 21, 2007
Creator:
Aguirre, J; Pao, H; Lin, H; Garland, P; O'Neill, D & Horton, K
Object Type:
Article
System:
The UNT Digital Library
Comments on Worldsheet Theories Dual to Free Large N Gauge Theories
We continue to investigate properties of the worldsheet conformal field theories (CFTs) which are conjectured to be dual to free large N gauge theories, using the mapping of Feynman diagrams to the worldsheet suggested in [1]. The modular invariance of these CFTs is shown to be built into the formalism. We show that correlation functions in these CFTs which are localized on subspaces of the moduli space may be interpreted as delta-function distributions, and that this can be consistent with a local worldsheet description given some constraints on the operator product expansion coefficients. We illustrate these features by a detailed analysis of a specific four-point function diagram. To reliably compute this correlator we use a novel perturbation scheme which involves an expansion in the large dimension of some operators.
Date:
March 21, 2007
Creator:
Aharony, Ofer; /Weizmann Inst. /Stanford U., ITP /SLAC; David, Justin R.; Gopakumar, Rajesh; Inst., /Harish-Chandra Res.; Komargodski, Zohar et al.
Object Type:
Report
System:
The UNT Digital Library
The Moduli Space and M(Atrix) Theory of 9d N=1 Backgrounds of M/String Theory
We discuss the moduli space of nine dimensional N = 1 supersymmetric compactifications of M theory/string theory with reduced rank (rank 10 or rank 2), exhibiting how all the different theories (including M theory compactified on a Klein bottle and on a Moebius strip, the Dabholkar-Park background, CHL strings and asymmetric orbifolds of type II strings on a circle) fit together, and what are the weakly coupled descriptions in different regions of the moduli space. We argue that there are two disconnected components in the moduli space of theories with rank 2. We analyze in detail the limits of the M theory compactifications on a Klein bottle and on a Moebius strip which naively give type IIA string theory with an uncharged orientifold 8-plane carrying discrete RR flux. In order to consistently describe these limits we conjecture that this orientifold non-perturbatively splits into a D8-brane and an orientifold plane of charge (-1) which sits at infinite coupling. We construct the M(atrix) theory for M theory on a Klein bottle (and the theories related to it), which is given by a 2 + 1 dimensional gauge theory with a varying gauge coupling compactified on a cylinder with specific boundary conditions. We …
Date:
March 21, 2007
Creator:
Aharony, Ofer; /Weizmann Inst. /Stanford U., ITP /SLAC; Komargodski, Zohar; Patir, Assaf & Inst., /Weizmann
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Frank Albert, September 21, 2007
The National Museum of the Pacific War presents an oral interview with Frank Albert. Albert joined the Navy in 1941. Growing up in poverty with 12 siblings, enlisting was a way to ensure three square meals a day and to finally have his own bed. Albert was assigned to the USS Enterprise (CV-6) as a shipfitter, involved in routine maintenance and damage control. As such, he was appreciated by many people and often repaid with alcohol, which he would share with others before stowing the remainder inside the ship’s walls, welding the makeshift cubby shut each time. At Pearl Harbor, he conducted shore patrol and once broke up an altercation involving his own brother. The two of them, along with about 15 other pairs of brothers, worked together on the Enterprise, in the early days. Albert encountered many dangerous events, particularly surviving a weeklong typhoon, and watching from the crow’s nest as a kamikaze approached and blew out the number two elevator. In the aftermath, part of his duties in damage control included administering morphine to the wounded. Albert was discharged shortly before the war ended, having spent four years in the service. For a time thereafter, he suffered from …
Date:
September 21, 2007
Creator:
Albert,Frank
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Frank Albert, September 21, 2007
The National Museum of the Pacific War presents an oral interview with Frank Albert. Albert joined the Navy in 1941. Growing up in poverty with 12 siblings, enlisting was a way to ensure three square meals a day and to finally have his own bed. Albert was assigned to the USS Enterprise (CV-6) as a shipfitter, involved in routine maintenance and damage control. As such, he was appreciated by many people and often repaid with alcohol, which he would share with others before stowing the remainder inside the ship’s walls, welding the makeshift cubby shut each time. At Pearl Harbor, he conducted shore patrol and once broke up an altercation involving his own brother. The two of them, along with about 15 other pairs of brothers, worked together on the Enterprise, in the early days. Albert encountered many dangerous events, particularly surviving a weeklong typhoon, and watching from the crow’s nest as a kamikaze approached and blew out the number two elevator. In the aftermath, part of his duties in damage control included administering morphine to the wounded. Albert was discharged shortly before the war ended, having spent four years in the service. For a time thereafter, he suffered from …
Date:
September 21, 2007
Creator:
Albert,Frank
Object Type:
Text
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 25, No. 24, Ed. 1 Thursday, June 21, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
June 21, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
COMMISSIONING OF A HIGH-BRIGHTNESS PHOTOINJECTOR FOR COMPTON SCATTERING X-RAY SOURCES
Compton scattering of intense laser pulses with ultrarelativistic electron beams has proven to be an attractive source of high-brightness x-rays with keV to MeV energies. This type of x-ray source requires the electron beam brightness to be comparable with that used in x-ray free-electron lasers and laser and plasma based advanced accelerators. We describe the development and commissioning of a 1.6 cell RF photoinjector for use in Compton scattering experiments at LLNL. Injector development issues such as RF cavity design, beam dynamics simulations, emittance diagnostic development, results of sputtered magnesium photo-cathode experiments, and UV laser pulse shaping are discussed. Initial operation of the photoinjector is described.
Date:
June 21, 2007
Creator:
Anderson, S G; Gibson, D J; Hartemann, F V; Messerly, M; Shverdin, M; Siders, C W et al.
Object Type:
Article
System:
The UNT Digital Library
Proposed RF Breakdown Studies at the AWA
A study of breakdown mechanism has been initiated at the Argonne Wakefield Accelerator (AWA). Breakdown may include several factors such as local field enhancement, explosive electron emission, Ohmic heating, tensile stress produced by electric field, and others. The AWA is building a dedicated facility to test various models for breakdown mechanisms and to determine the roles of different factors in the breakdown. We plan to trigger breakdown events with a high-powered laser at various wavelengths (IR to UV) to determine the role of explosive electron emission in the breakdown process. Another experimental idea follows from the recent work on a Schottky-enabled photoemission in an RF photoinjector [1] that allows us to determine in situ the field enhancement factor on a cathode surface. Monitoring the field enhancement factor before and after the breakdown can shed some light on a number of observations such as the crater formation process.
Date:
March 21, 2007
Creator:
Antipov, S.; Conde, M.; Gai, W.; Power, J. G.; Spentzouris, L.; Yusof, Z. et al.
Object Type:
Article
System:
The UNT Digital Library
Graduate Artist Certificate Recital: 2007-04-21 – Emily Aquin, violin
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Graduate Artist Certificate in Music Performance.
Date:
April 21, 2007
Creator:
Aquin, Emily
Object Type:
Sound
System:
The UNT Digital Library
Object Classification at the Nearby Supernova Factory
We present the results of applying new object classification techniques to the supernova search of the Nearby Supernova Factory. In comparison to simple threshold cuts, more sophisticated methods such as boosted decision trees, random forests, and support vector machines provide dramatically better object discrimination: we reduced the number of nonsupernova candidates by a factor of 10 while increasing our supernova identification efficiency. Methods such as these will be crucial for maintaining a reasonable false positive rate in the automated transient alert pipelines of upcoming large optical surveys.
Date:
December 21, 2007
Creator:
Aragon, Cecilia R.; Bailey, Stephen; Aragon, Cecilia R.; Romano, Raquel; Thomas, Rollin C.; Weaver, B. A. et al.
Object Type:
Article
System:
The UNT Digital Library
The European Parliament
None
Date:
May 21, 2007
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Salmon Spawning Below Bonneville Dam, Annual Report October 2005 - September 2006.
Since FY 2000, scientists at Pacific Northwest National Laboratory (PNNL) have conducted research to assess the extent of spawning by chum salmon (Oncorhynchus keta) and fall Chinook salmon (O. tshawytscha) in the lower mainstem Columbia River. Their work supports a larger project funded by the Bonneville Power Administration (BPA) aimed at characterizing the physical habitat used by mainstem fall Chinook and chum salmon populations. Multiple collaborators in addition to PNNL are involved in the BPA project--counterparts include the Washington Department of Fish and Wildlife (WDFW), U.S. Fish and Wildlife Service (USFWS), Pacific States Marine Fisheries Commission (PSMFC), U.S. Geological Survey (USGS), and Oregon Department of Fish and Wildlife (ODFW). Data resulting from the individual tasks each agency conducts are providing a sound scientific basis for developing strategies to operate the Federal Columbia River Power System (FCRPS) in ways that will effectively protect and enhance the chum and tule fall Chinook salmon populations--both listed as threatened under the Endangered Species Act (ESA). Fall Chinook salmon, thought to originate from Bonneville Hatchery, were first noted to be spawning downstream of Bonneville Dam by WDFW biologists in 1993. Known spawning areas include gravel beds on the Washington side of the river near Hamilton …
Date:
September 21, 2007
Creator:
Arntzen, Evan V.; Mueller, Robert P. & Murray, Christopher J.
Object Type:
Report
System:
The UNT Digital Library
Doctoral Lecture Recital: 2007-07-21 - Christopher Astilla, piano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date:
July 21, 2007
Creator:
Astilla, Christopher
Object Type:
Sound
System:
The UNT Digital Library
Production and Decay of Omega_c^0
We present an analysis of inclusive {Omega}{sub c}{sup 0} baryon production and decays in 230.5 fb{sup -1} of data recorded with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at the Stanford Linear Accelerator Center. {Omega}{sub c}{sup 0} baryons are reconstructed in four final states ({Omega}{sup -}{pi}{sup +}, {Omega}{sup -}{pi}{sup +}{pi}{sup 0}, {Omega}{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}, {Xi}{sup -}K{sup -}{pi}{sup +}{pi}{sup +}) and the ratios of branching fractions for these final states are measured. We also measure the momentum spectrum of the {Omega}{sub c}{sup 0} baryons in the e{sup +}e{sup -} center-of-mass frame. From the spectrum, they observe {Omega}{sub c}{sup 0} production from B decays and in c{bar c} events, and extract the two rates of production.
Date:
March 21, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
A STUDY OF CORROSION AND STRESS CORROSION CRACKING OF CARBON STEEL NUCLEAR WASTE STORAGE TANKS
The Hanford reservation Tank Farms in Washington State has 177 underground storage tanks that contain approximately 50 million gallons of liquid legacy radioactive waste from cold war plutonium production. These tanks will continue to store waste until it is treated and disposed. These nuclear wastes were converted to highly alkaline pH wastes to protect the carbon steel storage tanks from corrosion. However, the carbon steel is still susceptible to localized corrosion and stress corrosion cracking. The waste chemistry varies from tank to tank, and contains various combinations of hydroxide, nitrate, nitrite, chloride, carbonate, aluminate and other species. The effect of each of these species and any synergistic effects on localized corrosion and stress corrosion cracking of carbon steel have been investigated with electrochemical polarization, slow strain rate, and crack growth rate testing. The effect of solution chemistry, pH, temperature and applied potential are all considered and their role in the corrosion behavior will be discussed.
Date:
August 21, 2007
Creator:
BOOMER, K.D.
Object Type:
Article
System:
The UNT Digital Library
Kansas Advanced Semiconductor Project
KASP (Kansas Advanced Semiconductor Project) completed the new Layer 0 upgrade for D0, assumed key electronics projects for the US CMS project, finished important new physics measurements with the D0 experiment at Fermilab, made substantial contributions to detector studies for the proposed e+e- international linear collider (ILC), and advanced key initiatives in non-accelerator-based neutrino physics.
Date:
September 21, 2007
Creator:
Baringer, P.; Bean, A.; Bolton, T.; Horton-Smith, G.; Maravin, Y.; Ratra, B. et al.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with James Barnhill, September 21, 2007
The National Museum of the Pacific War presents an oral interview with James Barnhill. Barnhill joined the Navy after graduating from high school in 1940. Upon completion of bugle school, he was a regimental bugler until receiving orders to board the USS Enterprise (CV-6). He was assigned a second station as assistant photographer. Barnhill’s first voyage was to Hawaii in March 1941 for training. When news of the attack on Pearl Harbor arrived, Barnhill recalls sounding general quarters from the bridge with his bugle. His first mission was at the Marshall Islands, where the ship came under attack. As the war developed, Barnhill volunteered to fuse bombs, a task he performed with his younger brother, who had requested to be assigned with him. There were no less than a dozen sets of brothers on the ship at that time. At the Battle of Rennell Island, Barnhill remembers the ship was under strict orders to leave behind any men in the water, leaving them to be rescued by other ships. He left the Enterprise in July 1944 and enjoyed easy duty in Oregon, where his unit worked part-time civilian jobs at local factories, which was appreciated by the community as the …
Date:
September 21, 2007
Creator:
Barnhill, James
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with James Barnhill, September 21, 2007
The National Museum of the Pacific War presents an oral interview with James Barnhill. Barnhill joined the Navy after graduating from high school in 1940. Upon completion of bugle school, he was a regimental bugler until receiving orders to board the USS Enterprise (CV-6). He was assigned a second station as assistant photographer. Barnhill’s first voyage was to Hawaii in March 1941 for training. When news of the attack on Pearl Harbor arrived, Barnhill recalls sounding general quarters from the bridge with his bugle. His first mission was at the Marshall Islands, where the ship came under attack. As the war developed, Barnhill volunteered to fuse bombs, a task he performed with his younger brother, who had requested to be assigned with him. There were no less than a dozen sets of brothers on the ship at that time. At the Battle of Rennell Island, Barnhill remembers the ship was under strict orders to leave behind any men in the water, leaving them to be rescued by other ships. He left the Enterprise in July 1944 and enjoyed easy duty in Oregon, where his unit worked part-time civilian jobs at local factories, which was appreciated by the community as the …
Date:
September 21, 2007
Creator:
Barnhill, James
Object Type:
Text
System:
The Portal to Texas History
Experimental Component Characterization, Monte-Carlo-Based Image Generation and Source Reconstruction for the Neutron Imaging System of the National Ignition Facility
The Neutron Imaging System (NIS) is one of seven ignition target diagnostics under development for the National Ignition Facility. The NIS is required to record hot-spot (13-15 MeV) and downscattered (6-10 MeV) images with a resolution of 10 microns and a signal-to-noise ratio (SNR) of 10 at the 20% contour. The NIS is a valuable diagnostic since the downscattered neutrons reveal the spatial distribution of the cold fuel during an ignition attempt, providing important information in the case of a failed implosion. The present study explores the parameter space of several line-of-sight (LOS) configurations that could serve as the basis for the final design. Six commercially available organic scintillators were experimentally characterized for their light emission decay profile and neutron sensitivity. The samples showed a long lived decay component that makes direct recording of a downscattered image impossible. The two best candidates for the NIS detector material are: EJ232 (BC422) plastic fibers or capillaries filled with EJ399B. A Monte Carlo-based end-to-end model of the NIS was developed to study the imaging capabilities of several LOS configurations and verify that the recovered sources meet the design requirements. The model includes accurate neutron source distributions, aperture geometries (square pinhole, triangular wedge, mini-penumbral, …
Date:
August 21, 2007
Creator:
Barrera, C. A. & Moran, M. J.
Object Type:
Report
System:
The UNT Digital Library
Compensatory Paracrine Mechanisms That Define The Urothelial Response to Injury in Partial Bladder Outlet Obstruction
Diseases and conditions affecting the lower urinary tract are a leading cause of dysfunctional sexual health, incontinence, infection, and kidney failure. The growth, differentiation, and repair of the bladder's epithelial lining are regulated, in part, by fibroblast growth factor (FGF)-7 and -10 via a paracrine cascade originating in the mesenchyme (lamina propria) and targeting the receptor for FGF-7 and -10 within the transitional epithelium (urothelium). The FGF-7 gene is located at the 15q15-q21.1 locus on chromosome 15 and four exons generate a 3.852-kb mRNA. Five duplicated FGF-7 gene sequences that localized to chromosome 9 were predicted not to generate functional protein products, thus validating the use of FGF-7-null mice as an experimental model. Recombinant FGF-7 and -10 induced proliferation of human urothelial cells in vitro and transitional epithelium of wild-type and FGF-7-null mice in vivo.To determine the extent that induction of urothelial cell proliferation during the bladder response to injury is dependent on FGF-7, an animal model of partial bladder outlet obstruction was developed. Unbiased stereology was used to measure the percentage of proliferating urothelial cells between obstructed groups of wild-type and FGF-7-null mice. The stereological analysis indicated that a statistical significant difference did not exist between the two groups, …
Date:
June 21, 2007
Creator:
Bassuk, James; Lendvay, Thomas S.; Sweet, Robert; Han, Chang-Hee; Soygur, Tarkan; Cheng, Jan-Fang et al.
Object Type:
Article
System:
The UNT Digital Library
[Band and crowd at first pep-rally, 2007]
Photograph of a crowd of students in front of a stage in Clark Park on the UNT campus. They are gathered for the year's first pep-rally and a band is playing live on the stage. Trees and a dorm are visible past them.
Date:
September 21, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Cheer stunt at first pep rally, 2007]
Photograph of an NT Cheerleader performing a stunt in Clark Park for the first pep rally of the year. She is holding one of her legs straight up and is raising her other arm.
Date:
September 21, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Crowd at first pep-rally, 2007]
Photograph of a crowd of students behind a fence in Clark Park on the UNT campus. They are gathered for the year's first pep-rally and are gathered in front of a stage for a live performance.
Date:
September 21, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Crowd gathered at first pep-rally, 2007]
Photograph of a crowd of students behind a fence in Clark Park on the UNT campus. They are gathered for the year's first pep-rally and are gathered in front of a stage for a live performance.
Date:
September 21, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library