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Degree Department
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Year
Month
Shack-Hartmann Wavefront Sensing Performance Evaluation for Active Correction of the Large Synoptic Survey Telescope (LSST)
None
Date:
July 21, 2010
Creator:
Baker, K L & Seppala, L
Object Type:
Article
System:
The UNT Digital Library
2010 Thin Film & Small Scale Mechanical Behavior Gordon Research Conference
Over the past decades, it has been well established that the mechanical behavior of materials changes when they are confined geometrically at least in one dimension to small scale. It is the aim of the 2010 Gordon Conference on 'Thin Film and Small Scale Mechanical Behavior' to discuss cutting-edge research on elastic, plastic and time-dependent deformation as well as degradation mechanisms like fracture, fatigue and wear at small scales. As in the past, the conference will benefit from contributions from fundamental studies of physical mechanisms linked to material science and engineering reaching towards application in modern applications ranging from optical and microelectronic devices and nano- or micro-electrical mechanical systems to devices for energy production and storage. The conference will feature entirely new testing methodologies and in situ measurements as well as recent progress in atomistic and micromechanical modeling. Particularly, emerging topics in the area of energy conversion and storage, such as material for batteries will be highlighted. The study of small-scale mechanical phenomena in systems related to energy production, conversion or storage offer an enticing opportunity to materials scientists, who can provide new insight and investigate these phenomena with methods that have not previously been exploited.
Date:
July 30, 2010
Creator:
Balk, Dr. Thomas
Object Type:
Article
System:
The UNT Digital Library
Two-Photon Interactions with Nuclear Breakup in Relativistic Heavy Ion Collisions
Highly charged relativistic heavy ions have high cross-sections for two-photon interactions. The photon flux is high enough that two-photon interactions may be accompanied by additional photonuclear interactions. Except for the shared impact parameter, these interactions are independent. Additional interactions like mutual Coulomb excitation are of experimental interest, since the neutrons from the nuclear dissociation provide a simple, relatively unbiased trigger. We calculate the cross sections, rapidity, mass and transverse momentum (p{sub T}) distributions for exclusive {gamma}{gamma} production of mesons and lepton pairs, and for {gamma}{gamma} reactions accompanied by mutual Coulomb dissociation. The cross-sections for {gamma}{gamma} interactions accompanied by multiple neutron emission (XnXn) and single neutron emission (1n1n) are about 1/10 and 1/100 of that for the unaccompanied {gamma}{gamma} interactions. We discuss the accuracy with which these cross-sections may be calculated. The typical p{sub T} of {gamma}{gamma} final states is several times smaller than for comparable coherent photonuclear interactions, so p{sub T} may be an effective tool for separating the two classes of interactions.
Date:
July 7, 2010
Creator:
Baltz, Anthony J.; Gorbunov, Yuri; R Klein, Spencer & Nystrand, Joakim
Object Type:
Article
System:
The UNT Digital Library
Threshold Studies of the Microwave Instability in Electron Storage Rings
We use a Vlasov-Fokker-Planck program and a linearized Vlasov solver to study the microwave instability threshold of impedance models: (1) a Q = 1 resonator and (2) shielded coherent synchrotron radiation (CSR), and find the results of the two programs agree well. For shielded CSR we show that only two dimensionless parameters, the shielding parameter {Pi} and the strength parameter S{sub csr}, are needed to describe the system. We further show that there is a strong instability associated with CSR, and that the threshold, to good approximation, is given by (S{sub csr})th = 0.5 + 0.12{Pi}. In particular, this means that shielding has little effect in stabilizing the beam for {Pi} {approx}< 2; for larger {Pi} it is effective, with threshold current depending on shielding aperture as h{sup -3/2}. We, in addition, find another instability in the vicinity of {Pi} = 0.7 with a lower threshold, (S{sub csr}){sub th} {approx} 0.2. We find that the threshold to this instability depends strongly on damping time, (S{sub csr}){sub th} {approx} {tau}{sub p}{sup -1/2}, and that the tune spread at threshold is small - both hallmarks of a weak instability.
Date:
July 30, 2010
Creator:
Bane, K. L. F.; Cai, Y. & Stupakov, G.
Object Type:
Article
System:
The UNT Digital Library
Developmental long trace profiler using optimally aligned mirror based pentaprism
A low-budget surface slope measuring instrument, the Developmental Long Trace Profiler (DLTP), was recently brought into operation at the Advanced Light Source Optical Metrology Laboratory [Nucl. Instr. and Meth. A 616, 212-223 (2010)]. The instrument is based on a precisely calibrated autocollimator and a movable pentaprism. The capability of the DLTP to achieve sub-microradian surface slope metrology has been verified via cross-comparison measurements with other high-performance slope measuring instruments when measuring the same high-quality test optics. In the present work, a further improvement of the DLTP is achieved by replacing the existing bulk pentaprism with a specially designed mirror based pentaprism. A mirror based pentaprism offers the possibility to eliminate systematic errors introduced by inhomogeneity of the optical material and fabrication imperfections of a bulk pentaprism. We provide the details of the mirror based pentaprism design and describe an original experimental procedure for precision mutual alignment of the mirrors. The algorithm of the alignment procedure and its efficiency are verified with rigorous ray tracing simulations. Results of measurements of a spherically curved test mirror and a flat test mirror using the original bulk pentaprism are compared with measurements using the new mirror based pentaprism, demonstrating the improved performance.
Date:
July 21, 2010
Creator:
Barber, Samuel K; Morrison, Gregory Y.; Yashchuk, Valeriy V.; Gubarev, Mikhail V.; Geckeler, Ralf D.; Buchheim, Jana et al.
Object Type:
Article
System:
The UNT Digital Library
Civil Pleading Requirements After Bell Atlantic Corporation v. Twombly and Ashcroft v. Iqbal
This report discusses the U.S. Supreme Court 2007 and 2009 decisions, Bell Atlantic Corporation v. Twombly and Ashcroft v. Iqbal, governing whether a civil complaint filed in federal court will survive a motion to dismiss for failure to state a claim.
Date:
July 1, 2010
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
2010 GORDON RESEARCH CONFERENCE ON MITOCHONDRIA & CHLOROPLASTS, LUCCA, ITALY, JULY 11-16, 2010
The 2010 GRC on Mitochondria & Chloroplasts will assemble an international group of molecular, structural and cellular biologists, biochemists and geneticists investigating a broad spectrum of fundamental problems related to the biology of these organelles in animal, plant and fungal cells. This field has witnessed an extraordinary expansion in recent years, fueled by the discovery of the role of mitochondria in human disease and ageing, and of the synergy of chloroplasts and mitochondria in energetic output, the identification of novel factors involved in organelle division, movement, signaling and acclimation to changing environmental conditions, and by the powerful tools of organelle proteomics. The 2010 GRC will highlight advances in the elucidation of molecular mechanisms of organelle biogenesis including regulation of genome structure, evolution and expression, organellar protein import, assembly and turnover of respiratory and photosynthetic complexes, bidirectional signaling between organelles and nucleus, organelle morphology and dynamics, and the integration of cellular metabolism. We will also explore progress in mechanisms of disease and ageing/ senescence in animals and plants. The organellar field has forged new fronts toward a global and comprehensive understanding of mitochondrial and chloroplast biology at the molecular level. Many of the molecules under study in model organisms are responsible …
Date:
July 16, 2010
Creator:
Barkan, Alice
Object Type:
Article
System:
The UNT Digital Library
Assess the key physics that underpins high-hydro coupling-efficiency in NDCX-II experiments and high-gain heavy ion direct drive target designs using proven hydro codes like HYDRA
The simulations provided in this milestone have solidified the theoretical underpinning of direct drive targets and also the ability to design experiments on NDCX II that will enhance our understanding of ion-beam hydrodynamic coupling, and thus be relevant to IFE. For the case of the IFE targets, we have studied hydro and implosion efficiency using HYDRA in ID, a starting point towards the goal of polar direct drive in geometry compatible with liquid wall chambers. Recent analysis of direct drive fusion energy targets using heavy ion beams has found high coupling efficiency of ion beam energy into implosion energy. However, to obtain optimal coupling, the ion energy must increase during the pulse in order to penetrate the outflowing ablated material, and deposit the energy close enough to the fuel so that the fuel achieves sufficient implosion velocity. We have computationally explored ID (radial) time dependent models of ion driven direct drive capsule implosions using the Arbitrary Lagrangian-Eulerian (ALE) code HYDRA, to help validate the theoretical analysis done so far, particularly exploring the effects of varying the ion energy and ion current over the course of the pulse. On NDCX II, experiments have been proposed to explore issues of ion penetration …
Date:
July 1, 2010
Creator:
Barnard, J. J.; Hay, M. J.; Logan, B. G.; Ng, S. F.; Perkins, L. J.; Veitzer, S. et al.
Object Type:
Report
System:
The UNT Digital Library
Access to Special Nuclear Material at the Idaho National Laboratory
Access to special nuclear material (SNM) such as enriched uranium or plutonium is critical to the experimental validation of measurement techniques for nuclear nonproliferation applications. It is especially important that realistic quantities be available for measurements in the field. Security and safety requirements have made such access nearly impossible at many U.S. facilities. The Idaho National Laboratory (INL) has been able to provide kilogram quantities of SNM for in situ measurements ranging from testing of equipment in laboratory facilities, to outdoor measurements simulating real conditions, to transfer of the SNM to the customer’s facility and back for measurements in the field. The INL will be working to make SNM more widely accessible for measurements by nuclear nonproliferation projects, including those with international researchers.
Date:
July 1, 2010
Creator:
Bean, R.; Barrett, J.; Gerts, D. & Brush, B.
Object Type:
Article
System:
The UNT Digital Library
The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11
This report analyzes war funding for the Defense Department and tracks funding for USAID and VA Medical funding. Information on costs is useful to Congress to assess the FY2010 Supplemental for war costs for the Department of Defense (DOD) and State/USAID, FY2011 war requests, conduct oversight of past war costs, and consider the longer-term costs implications of the buildup of troops in Afghanistan and potential problems in the withdrawal of U.S. troops from Iraq.
Date:
July 16, 2010
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
FY2010 Supplemental for Wars, Disaster Assistance, Haiti Relief, and Other Programs
This report provides an overview of FY2010 supplemental appropriations and discusses this year's supplemental focused on the effect on the deficit of additional spending.
Date:
July 27, 2010
Creator:
Belasco, Amy; Else, Daniel H.; Lindsay, Bruce R.; Margesson, Rhoda; Nakamura, Kennon H.; Taft-Morales, Maureen et al.
Object Type:
Report
System:
The UNT Digital Library
The Portal to Texas History and Digital Projects at UNT
This presentation discusses the two digital collections in the UNT Libraries, The Portal to Texas History and the Digital Library. It discusses the benefits of these collections, how the partnerships work with organizations who contribute to the collections, and gives examples of the projects and items within these two collections.
Date:
July 15, 2010
Creator:
Belden, Dreanna
Object Type:
Presentation
System:
The UNT Digital Library
Exploring Crystal Plasticity Via Far-Field 3DXRD
None
Date:
July 1, 2010
Creator:
Bernier, J. V.; Barton, N. R.; Brandes, M. C.; Lienert, U.; Miller, M. P. & Mills, M. J.
Object Type:
Article
System:
The UNT Digital Library
Intelligence Issues for Congress
This report discusses the efforts currently underway to improve coordination and encourage better analysis amongst the various agencies within the U.S. Intelligence Community, especially with regard to the ongoing and prominent issue of international terrorism. In particular, this report addresses the false intelligence regarding Iraqi weapons of mass destruction and the current efforts in Iraq and Iran in general.
Date:
July 9, 2010
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Applicability of Transactional Memory to Modern Codes
None
Date:
July 22, 2010
Creator:
Bihari, B L
Object Type:
Article
System:
The UNT Digital Library
Time-Temperature-Transformation (TTT) Diagrams for Future Waste Compositions
As a part of the Waste Acceptance Product Specifications (WAPS) for Vitrified High-Level Waste Forms defined by the Department of Energy - Office of Environmental Management, the waste form stability must be determined for each of the projected high-level waste (HLW) types at the Savannah River Site (SRS). Specifically, WAPS 1.4.1 requires the glass transition temperature (T{sub g}) to be defined and time-temperature-transformation (TTT) diagrams to be developed. The T{sub g} of a glass is an indicator of the approximate temperature where the supercooled liquid converts to a solid on cooling or conversely, where the solid begins to behave as a viscoelastic solid on heating. A TTT diagram identifies the crystalline phases that can form as a function of time and temperature for a given waste type or more specifically, the borosilicate glass waste form. In order to assess durability, the Product Consistency Test (PCT) was used and the durability results compared to the Environmental Assessment (EA) glass. The measurement of glass transition temperature and the development of TTT diagrams have already been performed for the seven Defense Waste Processing Facility (DWPF) projected compositions as defined in the Waste Form Compliance Plan (WCP) and in SRNL-STI-2009-00025. Additional phase transformation information …
Date:
July 8, 2010
Creator:
Billings, A. & Edwards, T.
Object Type:
Report
System:
The UNT Digital Library
Objectives and Layout of a High-Resolution X-ray Imaging Crystal Spectrometer for the Large Helical Device (LHD)
A high-resolution X-ray imaging crystal spectrometer, whose concept was tested on NSTX and Alcator C-Mod, is being designed for LHD. This instrument will record spatially resolved spectra of helium-like Ar16+ and provide ion temperature profiles with spatial and temporal resolutions of < 2 cm and ≥ 10 ms. The stellarator equilibrium reconstruction codes, STELLOPT and PIES, will be used for the tomographic inversion of the spectral data. The spectrometer layout and instrumental features are largely determined by the magnetic field structure of LHD.
Date:
July 29, 2010
Creator:
Bitter, M.; Gates, D.; Monticello, D.; Neilson, H.; Reiman, A.; Roquemore, A. L. et al.
Object Type:
Report
System:
The UNT Digital Library
[Flyer: My Father's House]
Flyer advertising the play "My Father's House," which was written by Derick E. Grant and produced by the Black Academy of Arts and Letters on July 17, 2010 at the Clarence Muse Cafe Theatre.
Date:
July 2010
Creator:
Black Academy of Arts and Letters
Object Type:
Pamphlet
System:
The UNT Digital Library
Libya: Background and U.S. Relations
This report discusses the recent revolution in Libya, from its 2011 uprising to the end of the Qadhafi era. It specifically looks at Libya's weapons of mass destruction (WMD) disarmament, political reform and human rights, and energy as it relates to the Libyan economy.
Date:
July 16, 2010
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
International Population Assistance and Family Planning Programs: Issues for Congress
This report provides the issues for congress on the international population assistance and family planning programs.
Date:
July 8, 2010
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
Alternate Materials in Design of Radioactive Material Packages
This paper presents a summary of design and testing of material and composites for use in radioactive material packages. These materials provide thermal protection and provide structural integrity and energy absorption to the package during normal and hypothetical accident condition events as required by Title 10 Part 71 of the Code of Federal Regulations. Testing of packages comprising these materials is summarized.
Date:
July 9, 2010
Creator:
Blanton, P. & Eberl, K.
Object Type:
Article
System:
The UNT Digital Library
A Comparison of Two Thermal Insulation and Structural Materials for Use in Type B Packagings
This paper presents the summary of design features and test results of two Type B Shipping Package prototype configurations comprising different insulating materials developed by the Savannah River National Laboratory (SRNL) for the Department of Energy. The materials evaluated, a closed-cell polyurethane foam and a vacuformed ceramic fiber material, were selected to provide adequate structural protection to the package containment vessel during Normal Conditions of Transport (NCT) and Hypothetical Accident Condition (HAC) events and to provide thermal protection during the HAC fire. Polyurethane foam has been used in shipping package designs for many years because of the stiffness it provides to the structure and because of the thermal protection it provides during fire scenarios. This comparison describes how ceramic fiber material offers an alternative to the polyurethane foam in a specific overpack design. Because of the high operating temperature ({approx}2,300 F) of the ceramic material, it allows for contents with higher heat loads to be shipped than is possible with polyurethane foam. Methods of manufacturing and design considerations using the two materials will be addressed.
Date:
July 16, 2010
Creator:
Blanton, P. & Eberl, K.
Object Type:
Article
System:
The UNT Digital Library
PERFORMANCE OF A CONTAINMENT VESSEL CLOSURE FOR RADIOACTIVE GAS CONTENTS
This paper presents a summary of the design and testing of the containment vessel closure for the Bulk Tritium Shipping Package (BTSP). This package is a replacement for a package that has been used to ship tritium in a variety of content configurations and forms since the early 1970s. The containment vessel closure incorporates features specifically designed for the containment of tritium when subjected to the normal and hypothetical conditions required of Type B radioactive material shipping Packages. The paper discusses functional performance of the containment vessel closure of the BTSP prototype packages and separate testing that evaluated the performance of the metallic C-Rings used in a mock BTSP closure.
Date:
July 9, 2010
Creator:
Blanton, P. & Eberl, K.
Object Type:
Article
System:
The UNT Digital Library
Science and Technology Review September 2010
None
Date:
July 29, 2010
Creator:
Blobaum, K. J.
Object Type:
Report
System:
The UNT Digital Library