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551 Matching Results
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CAD Model and Visual Assisted Control System for NIF Target Area Positioners
The National Ignition Facility (NIF) target chamber contains precision motion control systems that reach up to 6 meters into the target chamber for handling targets and diagnostics. Systems include the target positioner, an alignment sensor, and diagnostic manipulators (collectively called positioners). Target chamber shot experiments require a variety of positioner arrangements near the chamber center to be aligned to an accuracy of 10 micrometers. Positioners are some of the largest devices in NIF, and they require careful monitoring and control in 3 dimensions to prevent interferences. The Integrated Computer Control System provides efficient and flexible multi-positioner controls. This is accomplished through advanced video-control integration incorporating remote position sensing and realtime analysis of a CAD model of target chamber devices. The control system design, the method used to integrate existing mechanical CAD models, and the offline test laboratory used to verify proper operation of the control system are described.
Date:
October 3, 2007
Creator:
Tekle, E. A.; Wilson, E. F. & Paik, T. S.
Object Type:
Article
System:
The UNT Digital Library
Longitudinal Bunch Lengthening Compensation in High Charge RF Photoinjector
In high charge RF photoinjectors for wakefield two beam acceleration studies, due to the strong longitudinal space charge, bunch lengthening between the photocathode and photoinjector exit is a critical issue. We present beam dynamics studies of bunch lengthening in an RF photoinjector for a high charge electron beam and describe methods to compensate the bunch lengthening to various degrees. In particular, the beam dynamics for bunch charge from 1nC to 30nC are studied for an S-band 2856 MHz photoinjector.
Date:
October 3, 2008
Creator:
Pei, S. & Adolphsen, C.
Object Type:
Article
System:
The UNT Digital Library
Recent vs from IceCube
IceCube is a 1 km3 neutrino detector now being built at the South Pole. Its 4800 optical modules will detect Cherenkov radiation from charged particles produced in neutrino interactions. IceCube will search for neutrinos of astrophysical origin, with energies from 100 GeV up to 1019 eV. It will be able to separate nue, nu mu and nu tau. In addition to detecting astrophysical neutrinos, IceCube will also search for neutrinos from WIMP annihilation in the Sun and the Earth, look for low-energy (10 MeV) neutrinos from supernovae, and search for a host of exotic signatures. With the associated IceTop surface air shower array, it will study cosmic-ray air showers. IceCube construction is now 50percent complete. After presenting preliminary results from the partial detector, I will discuss IceCube's future plans.
Date:
October 3, 2008
Creator:
Collaboration, IceCube & Klein, Spencer R.
Object Type:
Article
System:
The UNT Digital Library
Heat Transport by Turbulent Rayleigh-Benard Convection
We have developed a research program dedicated to the quantitative laboratory study of turbulent convection.
Date:
October 3, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
NIF ICCS Test Controller for Automated & Manual Testing
The National Ignition Facility (NIF) Integrated Computer Control System (ICCS) is a large (1.5 MSLOC), hierarchical, distributed system that controls all aspects of the NIF laser [1]. The ICCS team delivers software updates to the NIF facility throughout the year to support shot operations and commissioning activities. In 2006, there were 48 releases of ICCS: 29 full releases, 19 patches. To ensure the quality of each delivery, thousands of manual and automated tests are performed using the ICCS Test Controller test infrastructure. The TestController system provides test inventory management, test planning, automated test execution and manual test logging, release testing summaries and test results search, all through a web browser interface. Automated tests include command line based frameworks server tests and Graphical User Interface (GUI) based Java tests. Manual tests are presented as a checklist-style web form to be completed by the tester. The results of all tests, automated and manual, are kept in a common repository that provides data to dynamic status reports. As part of the 3-stage ICCS release testing strategy, the TestController system helps plan, evaluate and track the readiness of each release to the NIF facility.
Date:
October 3, 2007
Creator:
Zielinski, J S
Object Type:
Article
System:
The UNT Digital Library
Technology Assessment and Roadmap for the Emergency Radiation Dose Assessment Program
A Joint Interagency Working Group (JIWG) under the auspices of the Department of Homeland Security Office of Research and Development conducted a technology assessment of emergency radiological dose assessment capabilities as part of the overall need for rapid emergency medical response in the event of a radiological terrorist event in the United States. The goal of the evaluation is to identify gaps and recommend general research and development needs to better prepare the Country for mitigating the effects of such an event. Given the capabilities and roles for responding to a radiological event extend across many agencies, a consensus of gaps and suggested development plans was a major goal of this evaluation and road-mapping effort. The working group consisted of experts representing the Departments of Homeland Security, Health and Human Services (Centers for Disease Control and the National Institutes of Health), Food and Drug Administration, Department of Defense and the Department of Energy's National Laboratories (see appendix A for participants). The specific goals of this Technology Assessment and Roadmap were to: (1) Describe the general context for deployment of emergency radiation dose assessment tools following terrorist use of a radiological or nuclear device; (2) Assess current and emerging dose assessment …
Date:
October 3, 2005
Creator:
Turteltaub, K W; Hartman-Siantar, C; Easterly, C & Blakely, W
Object Type:
Report
System:
The UNT Digital Library
Scalable File Systems for High Performance Computing Final Report
Simulations of mode I interlaminar fracture toughness tests of a carbon-reinforced composite material (BMS 8-212) were conducted with LSDYNA. The fracture toughness tests were performed by U.C. Berkeley. The simulations were performed to investigate the validity and practicality of employing decohesive elements to represent interlaminar bond failures that are prevalent in carbon-fiber composite structure penetration events. The simulations employed a decohesive element formulation that was verified on a simple two element model before being employed to perform the full model simulations. Care was required during the simulations to ensure that the explicit time integration of LSDYNA duplicate the near steady-state testing conditions. In general, this study validated the use of employing decohesive elements to represent the interlaminar bond failures seen in carbon-fiber composite structures, but the practicality of employing the elements to represent the bond failures seen in carbon-fiber composite structures during penetration events was not established.
Date:
October 3, 2007
Creator:
Brandt, S A
Object Type:
Report
System:
The UNT Digital Library
Carbon Capture and Storage
Carbon capture and sequestration (CCS) is the long-term isolation of carbon dioxide from the atmosphere through physical, chemical, biological, or engineered processes. This includes a range of approaches including soil carbon sequestration (e.g., through no-till farming), terrestrial biomass sequestration (e.g., through planting forests), direct ocean injection of CO{sub 2} either onto the deep seafloor or into the intermediate depths, injection into deep geological formations, or even direct conversion of CO{sub 2} to carbonate minerals. Some of these approaches are considered geoengineering (see the appropriate chapter herein). All are considered in the 2005 special report by the Intergovernmental Panel on Climate Change (IPCC 2005). Of the range of options available, geological carbon sequestration (GCS) appears to be the most actionable and economic option for major greenhouse gas reduction in the next 10-30 years. The basis for this interest includes several factors: (1) The potential capacities are large based on initial estimates. Formal estimates for global storage potential vary substantially, but are likely to be between 800 and 3300 Gt of C (3000 and 10,000 Gt of CO{sub 2}), with significant capacity located reasonably near large point sources of the CO{sub 2}. (2) GCS can begin operations with demonstrated technology. Carbon dioxide …
Date:
October 3, 2007
Creator:
Friedmann, S.
Object Type:
Book
System:
The UNT Digital Library
Interaction of High Intensity Electromagnetic Waves with Plasmas
The focus of our work during the duration of this grant was on the following areas: (a) the fundamental plasma physics of intense laser-plasma interactions, including the nonlinear excitation of plasma waves for accelerator applications, as well as the recently discovered by us phenomenon of the relativistic bi-stability of relativistic plasma waves driven by a laser beatwave; (b) interaction of high power microwave beams with magnetized plasma, including some of the recently discovered by us phenomena such as the Undulator Induced Transparency (UIT) as well as the new approaches to dynamic manipulation of microwave pulses; (c) investigations of the multi-color laser pulse interactions in the plasma, including the recently discovered by us phenomenon of Electromagnetic Cascading (EC) and the effect of the EC of three-dimensional dynamics of laser pulses (enhanced/suppressed selffocusing etc.); (d) interaction of high-current electron beams with the ambient plasma in the context of Fast Ignitor (FI) physics, with the emphasis on the nonlinear dynamics of the Weibel instability and beam filamentation.
Date:
October 3, 2008
Creator:
Shvets, G.
Object Type:
Report
System:
The UNT Digital Library
Scenarios for Consuming Standardized Automated Demand Response Signals
Automated Demand Response (DR) programs require that Utility/ISO's deliver DR signals to participants via a machine to machine communications channel. Typically these DR signals constitute business logic information (e.g. prices and reliability/shed levels) as opposed to commands to control specific loads in the facility. At some point in the chain from the Utility/ISO to the loads in a facility, the business level information sent by the Utility/ISO must be processed and used to execute a DR strategy for the facility. This paper explores the various scenarios and types of participants that may utilize DR signals from the Utility/ISO. Specifically it explores scenarios ranging from single end user facility, to third party facility managers and DR Aggregators. In each of these scenarios it is pointed out where the DR signal sent from the Utility/ISO is processed and turned into the specific load control commands that are part of a DR strategy for a facility. The information in these signals is discussed. In some cases the DR strategy will be completely embedded in the facility while in others it may be centralized at a third party (e.g. Aggregator) and part of an aggregated set of facilities. This paper also discusses the pros …
Date:
October 3, 2008
Creator:
Koch, Ed & Piette, Mary Ann
Object Type:
Article
System:
The UNT Digital Library
Atomic Structure of Pyramidal Defects in GaN:Mg; Influence ofAnnealing
The atomic structure of the characteristic defects (Mg-rich hexagonal pyramids) in p-doped bulk and MOCVD GaN:Mg thin films grown with Ga polarity was determined at atomic resolution by direct reconstruction of the scattered electron wave in a transmission electron microscope. Small cavities were present inside the defects, confirmed also with positron annihilation. The inside walls of the cavities were covered by GaN of reverse polarity compared to the matrix. Defects in bulk GaN:Mg were almost one order of magnitude larger than in thin films. An exchange of Ga and N sublattices within the defect compared to the matrix lead to a 0.6 {+-} 0.2 {angstrom} displacement between the Ga sublattices of these two areas. A [1100]/3 shift with change from AB stacking in the matrix to BC within the entire pyramid was observed. Annealing of the MOCVD layers lead to slight increase of the defect size and an increase of the photoluminescence intensity. Positron annihilation confirms presence of vacancies of different sizes triggered by the Mg doping in as-grown samples and decrease of their concentration upon annealing at 900 and 1000 C.
Date:
October 3, 2005
Creator:
Liliental-Weber, Z.; Tomaszewicz, T.; Zakharov, D.; O'Keefe, M.; Hautakangas, S.; Saarinen, K. et al.
Object Type:
Article
System:
The UNT Digital Library
SLUDGE BATCH 5 SIMULANT FLOWSHEET STUDIES
The Defense Waste Processing Facility (DWPF) will transition from Sludge Batch 4 (SB4) processing to Sludge Batch 5 (SB5) processing in early fiscal year 2009. Tests were conducted using non-radioactive simulants of the expected SB5 composition to determine the impact of varying the acid stoichiometry during the Sludge Receipt and Adjustment Tank (SRAT) and Slurry Mix Evaporator (SME) processes. The work was conducted to meet the Technical Task Request (TTR) HLW/DWPF/TTR-2007-0007, Rev. 1 and followed the guidelines of a Task Technical and Quality Assurance Plan (TT&QAP). The flowsheet studies are performed to evaluate the potential chemical processing issues, hydrogen generation rates, and process slurry rheological properties as a function of acid stoichiometry. Initial SB5 flowsheet studies were conducted to guide decisions during the sludge batch preparation process. These studies were conducted with the estimated SB5 composition at the time of the study. The composition has changed slightly since these studies were completed due to changes in the washing plan to prepare SB5 and the estimated SB4 heel mass. Nine DWPF process simulations were completed in 4-L laboratory-scale equipment using both a batch simulant (Tank 51 simulant after washing is complete) and a blend simulant (Tank 40 simulant after Tank 51 …
Date:
October 3, 2008
Creator:
Lambert, D; Michael Stone, M; Bradley Pickenheim, B; David Best, D & David Koopman, D
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 410, Ed. 1 Tuesday, October 3, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
October 3, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 418, Ed. 1 Friday, October 3, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
October 3, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 414, Ed. 1 Wednesday, October 3, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
October 3, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 420, Ed. 1 Friday, October 3, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
October 3, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 78, No. 9, Ed. 1 Wednesday, October 3, 2001
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
October 3, 2001
Creator:
Jordan, Kasey A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 97, No. 13, Ed. 1 Friday, October 3, 2008
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
WASP Timeline
A timeline of major event involving the creation and existence of the Women Air force Service Pilots organization, printed from www.wasp-wwii.org.
Date:
October 3, 2000
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 158, No. 32, Ed. 1 Wednesday, October 3, 2007
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
October 3, 2007
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 20, Ed. 1 Wednesday, October 3, 2007
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily: Scene (Denton, Tex.), Vol. 92, No. 24, Ed. 1 Friday, October 3, 2008
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 21, Ed. 1 Tuesday, October 3, 2006
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 99, No. 5, Ed. 1 Wednesday, October 3, 2007
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
October 3, 2007
Creator:
Poling, Shawn R.
Object Type:
Newspaper
System:
The Portal to Texas History