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561 Matching Results
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Geometric transitions and D-term SUSY breaking
We propose a new way of using geometric transitions to study metastable vacua in string theory and certain confining gauge theories. The gauge theories in question are N=2 supersymmetric theories deformed to N=1 by superpotential terms. We first geometrically engineer supersymmetry-breaking vacua by wrapping D5 branes on rigid 2-cycles in noncompact Calabi-Yau geometries, such that the central charges of the branes are misaligned. In a limit of slightly misaligned charges, this has a gauge theory description, where supersymmetry is broken by Fayet-Iliopoulos D-terms. Geometric transitions relate these configurations to dual Calabi-Yaus with fluxes, where H_RR, H_NS and dJ are all nonvanishing. We argue that the dual geometry can be effectively used to study the resulting non-supersymmetric, confining vacua
Date:
November 5, 2007
Creator:
Aganagic, Mina; Aganagic, Mina & Beem, Christopher
Object Type:
Article
System:
The UNT Digital Library
San Francisco State University IAC 02-06 Final Report
The Industrial Assessment Center (IAC) at San Francisco State University (SFSU) has served the cause of energy efficiency as a whole, and in particular for small and medium-sized manufacturing facilities in northern and central California, within a approximately 150 miles (radial) of San Francisco since 1992. In the current reporting period (September 1, 2002 through November 31, 2006) we have had major accomplishments, which include but are not limited to: - Performing a total of 94 energy efficiency and waste minimization audit days of 87 industrial plants - Recommending and analysis of 809 energy efficiency measures - Training 22 energy engineers, most of whom have joined energy services companies in California. - Disseminating energy efficiency information among local manufacturers - Acting as an information source for energy efficiency for local manufacturers and utilizes - Cooperating with local utilities and California Energy Commission in their energy efficiency projects - Performing various assignments by DOE such as dissemination of information on SEN initiative, conducting workshops on energy efficiency issues, contacting large energy user plants - Establishing a course on “Energy: Resources, Alternatives and Conservation” as a general education course at SFSU - Bringing energy issues to the attention of students in classrooms
Date:
March 5, 2007
Creator:
Ahmad R. Ganji, Ph.D., P.E., IAC DIrector
Object Type:
Report
System:
The UNT Digital Library
Structure of the Lithosphere and Upper Mantle Across the Arabian Peninsula
Analysis of modern broadband (BB) waveform data allows for the inference of seismic velocity structure of the crust and upper mantle using a variety of techniques. This presentation will report inferences of seismic structure of the Arabian Plate using BB data from various networks. Most data were recorded by the Saudi Arabian National Digital Seismic Network (SANDSN) which consists of 38 (26 BB, 11 SP) stations, mostly located on the Arabian Shield. Additional data were taken from the 1995-7 Saudi Arabian IRIS-PASSCAL Deployment (9 BB stations) and other stations across the Peninsula. Crustal structure, inferred from teleseismic P-wave receiver functions, reveals thicker crust in the Arabian Platform (40-45 km) and the interior of the Arabian Shield (35-40 km) and thinner crust along the Red Sea coast. Lithospheric thickness inferred from teleseismic S-wave receiver functions reveals very thin lithosphere (40-80 km) along the Red Sea coast which thickens rapidly toward the interior of the Arabian Shield (100-120 km). We also observe a step of 20-40 km in lithospheric thickness across the Shield-Platform boundary. Seismic velocity structure of the upper mantle inferred from teleseismic P- and S-wave travel time tomography reveals large differences between the Shield and Platform, with the Shield being …
Date:
January 5, 2007
Creator:
Al-Amri, A. & Rodgers, A.
Object Type:
Article
System:
The UNT Digital Library
The Wild and Scenic Rivers Act and Federal Water Rights
This report discusses federal authority over water, and federal "reserved" and non-reserved water rights. Based on the language of the act and its legislative history, it appears that the act creates federal water rights. The act does not specify the quantity of the right. The amount of the federal right is likely to vary from river to river depending on the river's flows, the unappropriated flows in the river at the time of designation, and the values for which the river is being protected.
Date:
March 5, 2007
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Gray Wolves Under the Endangered Species Act: Distinct Population Segments and Experimental Populations
This report looks at the distinct population segments (DPSs) process as it is applied to the gray wolf. It also reviews experimental populations of wolves under the Endangered Species Act (ESA) and their protections.
Date:
November 5, 2007
Creator:
Alexander, Kristina & Corn, M. L.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 24, No. 14, Ed. 1 Thursday, April 5, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 5, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 25, No. 27, Ed. 1 Thursday, July 5, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 5, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Biological impacts and context of network theory
Many complex systems can be represented and analyzed as networks, and examples that have benefited from this approach span the natural sciences. For instance, we now know that systems as disparate as the World-Wide Web, the Internet, scientific collaborations, food webs, protein interactions and metabolism all have common features in their organization, the most salient of which are their scale-free connectivity distributions and their small-world behavior. The recent availability of large scale datasets that span the proteome or metabolome of an organism have made it possible to elucidate some of the organizational principles and rules that govern their function, robustness and evolution. We expect that combining the currently separate layers of information from gene regulatory-, signal transduction-, protein interaction- and metabolic networks will dramatically enhance our understanding of cellular function and dynamics.
Date:
January 5, 2007
Creator:
Almaas, E
Object Type:
Article
System:
The UNT Digital Library
Women in the United States Congress: 1917-2007
This report identifies the names, committee assignments, dates of service, and (for Representatives) districts of the 244 women who have served in Congress.
Date:
December 5, 2007
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Electron electric dipole moment experiment using electric-fieldquantized slow cesium atoms
A proof-of-principle electron electric dipole moment (e-EDM)experiment using slow cesium atoms, nulled magnetic fields, and electricfield quantization has been performed. With the ambient magnetic fieldsseen by the atoms reduced to less than 200 pT, an electric field of 6MV/m lifts the degeneracy between states of unequal lbar mF rbar and,along with the low (approximately 3 m/s) velocity, suppresses thesystematic effect from the motional magnetic field. The low velocity andsmall residual magnetic field have made it possible to induce transitionsbetween states and to perform state preparation, analysis, and detectionin regions free of applied static magnetic and electric fields. Thisexperiment demonstrates techniques that may be used to improve the e-EDMlimit by two orders of magnitude, but it is not in itself a sensitivee-EDM search, mostly due to limitations of the laser system.
Date:
April 5, 2007
Creator:
Amini, Jason M.; Munger Jr., Charles T. & Gould, Harvey.
Object Type:
Article
System:
The UNT Digital Library
Allinea DDT as a Parallel Debugging Alternative to Totalview
Totalview, from the Etnus Corporation, is a sophisticated and feature rich software debugger for parallel applications. As Totalview has gained in popularity and market share its pricing model has increased to the point where it is often prohibitively expensive for massively parallel supercomputers. Additionally, many of Totalview's advanced features are not used by members of the scientific computing community. For these reasons, supercomputing centers have begun to search for a basic parallel debugging tool which can be used as an alternative to Totalview. As the cost and complexity of Totalview has increased over the years, scientific computing centers have started searching for a viable parallel debugging alternative. DDT (Distributed Debugging Tool) from Allinea Software is a relatively new parallel debugging tool which aims to provide much of the same functionality as Totalview. This review outlines the basic features and limitations of DDT to determine if it can be a reasonable substitute for Totalview. DDT was tested on the NERSC platforms Bassi, Seaborg, Jacquard and Davinci with Fortran90, C, and C++ codes using MPI and OpenMP for parallelism.
Date:
March 5, 2007
Creator:
Antypas, K.B.
Object Type:
Report
System:
The UNT Digital Library
Planar Limit of Orientifold Field Theories and Emergent Center Symmetry
We consider orientifold field theories (i.e. SU(N) Yang-Mills theories with fermions in the two-index symmetric or antisymmetric representations) on R{sub 3} x S{sub 1} where the compact dimension can be either temporal or spatial. These theories are planar equivalent to supersymmetric Yang-Mills. The latter has Z{sub N} center symmetry. The famous Polyakov criterion establishing confinement-deconfinement phase transition as that from Z{sub N} symmetric to Z{sub N} broken phase applies. At the Lagrangian level the orientifold theories have at most a Z{sub 2} center. We discuss how the full Z{sub N} center symmetry dynamically emerges in the orientifold theories in the limit N {yields} {infinity}. In the confining phase the manifestation of this enhancement is the existence of stable k-strings in the large-N limit of the orientifold theories. These strings are identical to those of supersymmetric Yang-Mills theories. We argue that critical temperatures (and other features) of the confinement-deconfinement phase transition are the same in the orientifold daughters and their supersymmetric parent up to 1/N corrections. We also discuss the Abelian and non-Abelian confining regimes of four-dimensional QCD-like theories.
Date:
December 5, 2007
Creator:
Armoni, Adi; Shifman, Mikhail & Unsal, Mithat
Object Type:
Report
System:
The UNT Digital Library
Growing Significance of Renewable Energy
Presentation on renewable energy innovations and policies by Dr. Dan Arvizu of the National Renewable Energy Laboratory.
Date:
February 5, 2007
Creator:
Arvizu, D. E.
Object Type:
Presentation
System:
The UNT Digital Library
Integrating Innovation and Policy for a Renewable Energy Future
Presentation on renewable energy innovations and policies by Dr. Dan Arvizu of the National Renewable Energy Laboratory.
Date:
February 5, 2007
Creator:
Arvizu, D. E.
Object Type:
Presentation
System:
The UNT Digital Library
Measurements of CP-Violating Asymmetries in B^0 toa_1^+(1260) \pi^- Decays
The authors present measurements of CP-violating asymmetries in the decay B{sup 0} {yields} a{sub 1}{sup {+-}}(1260){pi}{sup {-+}} with a{sub 1}{sup {+-}}(1260) {yields} {pi}{sup {-+}}{pi}{sup {+-}}{pi}{sup {+-}}. The data sample corresponds to 384 x 10{sup 6} B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric B-factory at SLAC. They measure the CP-violating asymmetry {Alpha}{sub CP}{sup a{sub 1}{pi}} = -0.07 {+-} 0.07 {+-} 0.02, the mixing-induced CP violation parameter S{sub a{sub 1}{pi}} = 0.37 {+-} 0.21 {+-} 0.07, the direct Cp violation parameter C{sub a{sub 1}{pi}} = -0.10 {+-} 0.15 {+-} 0.09, and the parameters {Delta}C{sub a{sub 1}{pi}} = 0.26 {+-} 0.15 {+-} 0.07 and {Delta}S{sub a{sub 1}{pi}} = -0.14 {+-} 0.21 {+-} 0.06. From these measured quantities they determine the angle {alpha}{sub eff} = 78.6{sup o} {+-} 7.3{sup o}.
Date:
January 5, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Health Care and Markets
Health care spending is one of the most rapidly growing portions of the federal budget. Projections suggest if the rapid growth in health care costs is not curtailed, governments at all levels will face an uncomfortable choice between significant cuts in other spending priorities or major tax increases. This report examines the economic justification for government intervention and involvement in health care markets.
Date:
January 5, 2007
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Electron localization in a two-channel tight-binding model with correlated disorder
This article discusses electron localization in a two-channel tight-binding model with correlated disorder.
Date:
October 5, 2007
Creator:
Bagci, V. M. K. & Krokhin, Arkadii A.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Jack Bailey, July 5, 2007
The National Museum of the Pacific War presents an oral interview with Jack Bailey. Bailey joined the Texas National Guard when he was 14 years old, lying about his age. In November 1939, his unit was mobilized and he left for the Philippines with the 36th Division. Bailey shipped overseas and his group was diverted to Australia after the attack on Pearl Harbor. They boarded a Dutch troop ship and headed for Java. On Java, outnumbered and out of ammunition, his unit surrendered to the Japanese and became known as the Lost Battalion. Spending two and a half years imprisoned in Burma, he was beaten repeatedly and forced to build a railway bridge made of steel and bamboo. Natives snuck intelligence to American officers, and in this fashion Bailey learned the war had finally ended. He and fellow POWs repaired the airfield so that they could be evacuated. Bailey returned home in December 1945 and was awarded the Purple Heart for the injuries inflicted on him as a prisoner. After his discharge in 1946, he found that he was having trouble with his heart and so was granted 100-percent disability.
Date:
July 5, 2007
Creator:
Bailey, Jack
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Jack Bailey, July 5, 2007
The National Museum of the Pacific War presents an oral interview with Jack Bailey. Bailey joined the Texas National Guard when he was 14 years old, lying about his age. In November 1939, his unit was mobilized and he left for the Philippines with the 36th Division. Bailey shipped overseas and his group was diverted to Australia after the attack on Pearl Harbor. They boarded a Dutch troop ship and headed for Java. On Java, outnumbered and out of ammunition, his unit surrendered to the Japanese and became known as the Lost Battalion. Spending two and a half years imprisoned in Burma, he was beaten repeatedly and forced to build a railway bridge made of steel and bamboo. Natives snuck intelligence to American officers, and in this fashion Bailey learned the war had finally ended. He and fellow POWs repaired the airfield so that they could be evacuated. Bailey returned home in December 1945 and was awarded the Purple Heart for the injuries inflicted on him as a prisoner. After his discharge in 1946, he found that he was having trouble with his heart and so was granted 100-percent disability.
Date:
July 5, 2007
Creator:
Bailey, Jack
Object Type:
Text
System:
The Portal to Texas History
Hydrogen Separation Membranes Annual Report for FY 2006.
The objective of this work is to develop dense ceramic membranes for separating hydrogen from other gaseous components in a nongalvanic mode, i.e., without using an external power supply or electrical circuitry. This goal of this project is to develop two types of dense ceramic membrane for producing hydrogen nongalvanically, i.e., without electrodes or external power supply, at commercially significant fluxes under industrially relevant operating conditions. The first type of membrane, hydrogen transport membranes (HTMs), will be used to separate hydrogen from gas mixtures such as the product streams from coal gasification, methane partial oxidation, and water-gas shift reactions. Potential ancillary uses of HTMs include dehydrogenation and olefin production, as well as hydrogen recovery in petroleum refineries and ammonia synthesis plants, the largest current users of deliberately produced hydrogen. The second type of membrane, oxygen transport membranes (OTMs), will produce hydrogen by nongalvanically removing oxygen that is generated when water dissociates at elevated temperatures. This report describes progress that was made during FY 2006 on the development of OTM and HTM materials.
Date:
February 5, 2007
Creator:
Balachandran, U.; Chen, L.; Ciocco, M.; Doctor, R. D.; Dorris, S. E.; Emerson, J. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Measurement of the CKM Angles at BaBar And Belle
The primary goal of the BaBar and Belle experiments is to overconstrain the CKM Unitarity Triangle. Measurements of the angles of this triangle, known as {beta}, {alpha}, and {gamma} (or {phi}{sub 1}, {phi}{sub 2}, and {phi}{sub 3}) give insight into the Standard Model description of CP violation in the quark sector. BaBar and Belle have recorded almost 1 ab{sup -1} combined, and have measured {beta} to high precision. Measurements of {alpha} and {gamma} are less precise at present, but both experiments are rapidly accumulating data and developing new analysis techniques, and measurements of these angles will continue to provide useful constraints on the Standard Model description of CP violation in the years to come.
Date:
December 5, 2007
Creator:
Barlow, Nick
Object Type:
Article
System:
The UNT Digital Library
[Honors Council member addressing group]
Photograph of the Honors Council members gathered at the lounge inside the Honors College Office. They're sitting on couches and chairs, while one stands to address the group. One of the members has a laptop out and another has papers.
Date:
October 5, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Honors Council member speaking at meeting]
Photograph of the Honors Council members gathered at the lounge inside the Honors College Office. They're sitting on couches and chairs and one is speaking to the group.
Date:
October 5, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Honors Council member speaking from couch]
Photograph of Honors Council members gathered at the lounge inside the Honors College Office. They're sitting on couches and the ground and one is speaking to the group. There is a counter and a calendar behind them.
Date:
October 5, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library