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381
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128
Texas State Publications
78
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54
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Comparing Linear Microinstability of the National Compact Stellarator Expriment and a Shaped Tokamak
One metric for comparing con nement properties of di erent magnetic fusion energy con gurations is the linear critical gradient of drift wave modes. The critical gradient scale length determines the ratio of the core to pedestal temperature when a plasma is limited to marginal stability in the plasma core. The gyrokinetic turbulence code GS2 was used to calculate critical temperature gradients for the linear, collisionless ion tem- perature gradient (ITG) mode in the National Compact Stellarator Experiment (NCSX) and a prototypical shaped tokamak, based on the pro les of a JET H-mode shot and the stronger shaping of ARIES-AT. While a concern was that the narrow cross section of NCSX at some toroidal locations would result in steep gradients that drive instabilities more easily, it is found that other stabilizing e ects of the stellarator con guration o set this so that the normalized critical gradients for NCSX are competitive with or even better than for the tokamak. For the adiabatic ITG mode, NCSX and the tokamak had similar critical gradients, though beyond marginal stability, NCSX had larger growth rates. However, for the kinetic ITG mode, NCSX had a higher critical gradient and lower growth rates until a/LT ≈#25; …
Date:
November 20, 2012
Creator:
J.A. Baumgaertel, G.W. Hammett and D.R. Mikkelsen
Object Type:
Report
System:
The UNT Digital Library
Comparison of Gas Puff Imaging Data in NSTX with the DEGAS 2 Simulation
Gas-Puff-Imaging (GPI) is a two dimensional diagnostic which measures the edge Dα light emission from a neutral D2 gas puff nears the outer mid-plane of NSTX. DEGAS 2 is a 3-D Monte Carlo code used to model neutral transport and atomic physics in tokamak plasmas. In this paper we compare measurements of the Dα light emission obtained by GPI on NSTX with DEGAS 2 simulations of Dα light emission for specific experiments. Both the simulated spatial distribution and absolute intensity of the Dα light emission agree well with the experimental data obtained between ELMs in H-mode. __________________________________________________
Date:
November 8, 2012
Creator:
Cao, B.; Stotler, D. P.; Zweben, S. J.; Bell, M.; Diallo, A. & Leblanc, B.
Object Type:
Report
System:
The UNT Digital Library
Computational fluid dynamic modeling of fluidized-bed polymerization reactors
Polyethylene is one of the most widely used plastics, and over 60 million tons are produced worldwide every year. Polyethylene is obtained by the catalytic polymerization of ethylene in gas and liquid phase reactors. The gas phase processes are more advantageous, and use fluidized-bed reactors for production of polyethylene. Since they operate so close to the melting point of the polymer, agglomeration is an operational concern in all slurry and gas polymerization processes. Electrostatics and hot spot formation are the main factors that contribute to agglomeration in gas-phase processes. Electrostatic charges in gas phase polymerization fluidized bed reactors are known to influence the bed hydrodynamics, particle elutriation, bubble size, bubble shape etc. Accumulation of electrostatic charges in the fluidized-bed can lead to operational issues. In this work a first-principles electrostatic model is developed and coupled with a multi-fluid computational fluid dynamic (CFD) model to understand the effect of electrostatics on the dynamics of a fluidized-bed. The multi-fluid CFD model for gas-particle flow is based on the kinetic theory of granular flows closures. The electrostatic model is developed based on a fixed, size-dependent charge for each type of particle (catalyst, polymer, polymer fines) phase. The combined CFD model is first verified …
Date:
November 2, 2012
Creator:
Rokkam, Ram
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Congressional Investigations of the Department of Justice, 1920-2012: History, Law, and Practice
This report briefly reviews the legal basis for investigative oversight, followed by several prominent examples of congressional oversight that reflect the significant breadth and reach of the legislative investigative prerogative vis-à-vis the Department. The report alos reviews and assess the Department’s contentions, based on policy, common law, and constitutional privilege, that it has asserted to attempt to limit congressional access to agency information.
Date:
November 5, 2012
Creator:
Dolan, Alissa M. & Garvey, Todd
Object Type:
Report
System:
The UNT Digital Library
Congressional Nominations to U.S. Service Academies: An Overview and Resources for Outreach and Management
Report that describes statutory requirements for allocating congressional nominations to service academies. It also identifies the qualifications that must be met by potential nominees. Includes a sample document.
Date:
November 30, 2012
Creator:
Petersen, R. Eric
Object Type:
Report
System:
The UNT Digital Library
Congressional Redistricting: An Overview
This report discusses the decennial apportionment process that determines the number of seats in the House of Representatives for which each state qualifies, based on population counts. It also points out the proposed congressional legislation.
Date:
November 21, 2012
Creator:
Crocker, Royce
Object Type:
Report
System:
The UNT Digital Library
Contract Postal Units: Analysis of Location, Service, and Financial Characteristics
A letter report issued by the Government Accountability Office with an abstract that begins "Although contract postal units (CPUs) have declined in number, their nationwide presence in urban and rural areas supplements the U.S. Postal Service's (USPS) network of post offices by providing additional locations and hours of service. More than 60 percent of CPUs are in urban areas where they can provide customers nearby alternatives for postal services when they face long lines at local post offices. Over one-half of CPUs are located less than 2 miles from the nearest post office. Urban CPUs are, on average, closer to post offices than rural CPUs. CPUs are also sometimes located in remote or fast-growing areas where post offices are not conveniently located or may not be cost effective. CPUs further supplement post offices by providing expanded hours of service. On average, CPUs are open 54 hours per week, compared to 41 hours for post offices. In addition, a greater proportion of CPUs than post offices are open after 6 p.m. and on Sundays. These factors are important as USPS considers expanding the use of post office alternatives to cut costs and maintain access to its products and services."
Date:
November 14, 2012
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Contracting Programs for Alaska Native Corporations: Historical Development and Legal Authorities
This report discusses historical development and legal authorities related to contracting programs for Alaska Native Corporations.
Date:
November 28, 2012
Creator:
Manuel, Kate M.; Luckey, John R. & Smith, Jane M.
Object Type:
Report
System:
The UNT Digital Library
Controlling Air Emissions from Outer Continental Shelf Sources: A Comparison of Two Programs—EPA and DOI
This report contains a list of difference and its components between the Department of Interior (DOI) and the Environmental Protection Agency (EPA) in controlling air emissions from outer continental shelf sources.
Date:
November 26, 2012
Creator:
Ramseur, Jonathan L.
Object Type:
Report
System:
The UNT Digital Library
The Cornell-SLAC Pixel Array Detector at LCLS
None
Date:
November 19, 2012
Creator:
Hart, P.; Boutet, S.; Carini, G.; Dragone, A.; Duda, B.; Freytag, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Correctional Populations in the United States, 2011
"This report provides summary data on offenders supervised by the adult correctional systems."
Date:
November 2012
Creator:
Glaze, Lauren E. & Parks, Erika
Object Type:
Text
System:
The UNT Digital Library
Corrosion Control Measures For Liquid Radioactive Waste Storage Tanks At The Savannah River Site
The Savannah River Site has stored radioactive wastes in large, underground, carbon steel tanks for approximately 60 years. An assessment of potential degradation mechanisms determined that the tanks may be vulnerable to nitrate- induced pitting corrosion and stress corrosion cracking. Controls on the solution chemistry and temperature of the wastes are in place to mitigate these mechanisms. These controls are based upon a series of experiments performed using simulated solutions on materials used for construction of the tanks. The technical bases and evolution of these controls is presented in this paper.
Date:
November 27, 2012
Creator:
Wiersma, B. J. & Subramanian, K. H.
Object Type:
Article
System:
The UNT Digital Library
Cost-Effectiveness of Home Energy Retrofits in Pre-Code Vintage Homes in the United States
This analytical study examines the opportunities for cost-effective energy efficiency and renewable energy retrofits in residential archetypes constructed prior to 1980 (Pre-Code) in fourteen U.S. cities. These fourteen cities are representative of each of the International Energy Conservation Code (IECC) climate zones in the contiguous U.S. The analysis is conducted using an in-house version of EnergyGauge USA v.2.8.05 named CostOpt that has been programmed to perform iterative, incremental economic optimization on a large list of residential energy efficiency and renewable energy retrofit measures. The principle objectives of the study are as follows: to determine the opportunities for cost effective source energy reductions in this large cohort of existing residential building stock as a function of local climate and energy costs; and to examine how retrofit financing alternatives impact the source energy reductions that are cost effectively achievable.
Date:
November 1, 2012
Creator:
Fairey, P. & Parker, D.
Object Type:
Report
System:
The UNT Digital Library
Counting Electoral Votes: An Overview of Procedures at the Joint Session, Including Objections by Members of Congress
Report that describes the steps which precede the joint session and the procedures set in the Constitution and statute by which the House and Senate jointly certify the results of the electoral vote. It also discusses the procedures set in law governing challenges to the validity of an electoral vote, and makes reference to the procedures followed during the joint session in 2005 by which the election of George W. Bush was certified.
Date:
November 30, 2012
Creator:
Maskell, Jack & Rybicki, Elizabeth
Object Type:
Report
System:
The UNT Digital Library
Credit Union Department Newsletter, Number 11-12, November 2012
Newsletter of the Texas Credit Union Department containing departmental news and announcements, deadlines, and other information of importance to credit unions.
Date:
November 21, 2012
Creator:
Texas. Credit Union Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
CSPAD-140k - Experimental Applications at LCLS
None
Date:
November 20, 2012
Creator:
Herrmann, Sven; Boutet, S.; Carini, G.; Dragone, A.; Duda, B.; Freytag, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Cuba: Issues for the 112th Congress
Report that discusses the current political conditions of Cuba as well as its relationship with the United States. In particular, the report focuses on U.S. policy regarding Cuba including various economic sanctions, human rights issues, and foreign aid appropriations.
Date:
November 6, 2012
Creator:
Sullivan, Mark P.
Object Type:
Report
System:
The UNT Digital Library
Cuba: U.S. Restrictions on Travel and Remittances
This report provides information about the U.S. Restrictions on Travel and Remittances on Cuba. Restriction on travel to Cuba has been a key and often contentious component in the U.S.
Date:
November 9, 2012
Creator:
Sullivan, Mark P.
Object Type:
Report
System:
The UNT Digital Library
Cycloidal Wave Energy Converter
This program allowed further advancing the development of a novel type of wave energy converter, a Cycloidal Wave Energy Converter or CycWEC. A CycWEC consists of one or more hydrofoils rotating around a central shaft, and operates fully submerged beneath the water surface. It operates under feedback control sensing the incoming waves, and converts wave power to shaft power directly without any intermediate power take off system. Previous research consisting of numerical simulations and two dimensional small 1:300 scale wave flume experiments had indicated wave cancellation efficiencies beyond 95%. The present work was centered on construction and testing of a 1:10 scale model and conducting two testing campaigns in a three dimensional wave basin. These experiments allowed for the first time for direct measurement of electrical power generated as well as the interaction of the CycWEC in a three dimensional environment. The Atargis team successfully conducted two testing campaigns at the Texas A&M Offshore Technology Research Center and was able to demonstrate electricity generation. In addition, three dimensional wave diffraction results show the ability to achieve wave focusing, thus increasing the amount of wave power that can be extracted beyond what was expected from earlier two dimensional investigations. Numerical results …
Date:
November 30, 2012
Creator:
Siegel, Stefan G.
Object Type:
Report
System:
The UNT Digital Library
A data driven approach to assess team performance through team communication.
None
Date:
November 1, 2012
Creator:
Forsythe, James Chris; Glickman, Matthew R.; Haass, Michael Joseph & Whetzel, Jonathan H.
Object Type:
Report
System:
The UNT Digital Library
Data Quality Objectives Supporting Radiological Air Emissions Monitoring for the PNNL Site
Pacific Northwest National Laboratory (PNNL) is in the process of developing a radiological air monitoring program for the PNNL Site that is distinct from that of the nearby Hanford Site. The original DQO (PNNL-19427) considered radiological emissions at the PNNL Site from Physical Sciences Facility (PSF) major emissions units. This first revision considers PNNL Site changes subsequent to the implementation of the original DQO. A team was established to determine how the PNNL Site changes would continue to meet federal regulations and address guidelines developed to monitor air emissions and estimate offsite impacts of radioactive material operations. The result is an updated program to monitor the impact to the public from the PNNL Site. The team used the emission unit operation parameters and local meteorological data as well as information from the PSF Potential-to-Emit documentation and Notices of Construction submitted to the Washington State Department of Health (WDOH). The locations where environmental monitoring stations would most successfully characterize the maximum offsite impacts of PNNL Site emissions from the three PSF buildings with major emission units were determined from these data. Three monitoring station locations were determined during the original revision of this document. This first revision considers expanded Department of …
Date:
November 12, 2012
Creator:
Barnett, J. M.; Meier, Kirsten M.; Snyder, Sandra F.; Fritz, Brad G.; Poston, Theodore M. & Antonio, Ernest J.
Object Type:
Report
System:
The UNT Digital Library
A demand-driven, capacity-constrained, adaptive algorithm for computing steady-state and transient flows in a petroleum transportation network.
None
Date:
November 1, 2012
Creator:
Beyeler, Walter Eugene; Corbet, Thomas Frank, Jr. & Hobbs, Jacob A. (University of New Mexico, Albuquerque, NM)
Object Type:
Report
System:
The UNT Digital Library
Demographic Study of Texas Lottery Players: 2012
This report presents the results of a random survey of adult Texas residents aged 18 and older, to measure the citizen participation rates, the distribution and frequency of play, and the demographic profiles of past-year lottery players and non-players.
Date:
November 2012
Creator:
University of Houston. Center for Public Policy.
Object Type:
Report
System:
The Portal to Texas History
Density Functional Theory Approach to Nuclear Fission
None
Date:
November 13, 2012
Creator:
Schunck, N.
Object Type:
Article
System:
The UNT Digital Library