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1,632 Matching Results
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Army Drawdown and Restructuring: Background and Issues for Congress
On January 26, 2012, senior DOD leadership unveiled a new defense strategy based on a review of potential future security challenges, current defense strategy, and budgetary constraints. This new strategy envisions a smaller, leaner Army that is agile, flexible, rapidly deployable, and technologically advanced. This strategy will rebalance the Army's global posture and presence, emphasizing where potential problems are likely to arise, such as the Asia-Pacific region and the Middle East. Potential issues for Congress include the strategic risk posed by a smaller and restructured Army; the "health" of the Army given the impending downsizing; where the force will be based; the role of the National Guard and Reserves; and should the enrollment at the service academies (West Point) be reduced to pre-9/11 levels. This report will be updated as circumstances warrant.
Date:
April 20, 2012
Creator:
Feickert, Andrew & Henning, Charles A.
Object Type:
Report
System:
The UNT Digital Library
Assessment and Mitigation of Diagnostic-Generated Electromagnetic Interference at the National Ignition Facility
Electromagnetic interference (EMI) is an ever-present challenge at laser facilities such as the National Ignition Facility (NIF). The major source of EMI at such facilities is laser-target interaction that can generate intense electromagnetic fields within, and outside of, the laser target chamber. In addition, the diagnostics themselves can be a source of EMI, even interfering with themselves. In this paper we describe EMI generated by ARIANE and DIXI, present measurements, and discuss effects of the diagnostic-generated EMI on ARIANE's CCD and on a PMT nearby DIXI. Finally we present some of the efforts we have made to mitigate the effects of diagnostic-generated EMI on NIF diagnostics.
Date:
April 20, 2012
Creator:
Brown, C. G.; Ayers, M. J.; Felker, B.; Ferguson, W.; Holder, J P; Nagel, S. R. et al.
Object Type:
Article
System:
The UNT Digital Library
An Assessment of Energy Potential at Non-Powered Dams in the United States
fleet by 15%. A majority of this potential is concentrated in just 100 NPDs, which could contribute approximately 8 GW of clean, reliable hydropower; the top 10 facilities alone could add up to 3 GW of new hydropower. Eighty-one of the 100 top NPDs are U.S. Army Corps of Engineers (USACE) facilities, many of which, including all of the top 10, are navigation locks on the Ohio River, Mississippi River, Alabama River, and Arkansas River, as well as their major tributaries. This study also shows that dams owned by the U.S. Bureau of Reclamation hold the potential to add approximately 260 MW of capacity; the Bureau has also engaged in an effort to conduct a more detailed evaluation of its own facilities.
Date:
April 1, 2012
Creator:
Hadjerioua, Boualem; Wei, Yaxing & Kao, Shih-Chieh
Object Type:
Report
System:
The UNT Digital Library
Assessment of Geothermal Resource Potential at a High-Priority Area on the Utah Testing and Training Range–South (UTTR–S)
Field investigations conducted during 2011 support and expand the conclusion of the original Preliminary Report that discovery of a viable geothermal system is possible in the northwestern part of the Utah Testing and Training Range-South (UTTR-S), referred to henceforth as Focus Area 1. The investigations defined the southward extent of the Wendover graben into and near Focus Area 1, enhanced the understanding of subsurface conditions, and focused further geothermal exploration efforts towards the northwestern-most part of Focus Area 1. Specifically, the detailed gravity survey shows that the Wendover graben, first defined by Cook et al. (1964) for areas north of Interstate Highway 80, extends and deepens southwest-ward to the northwest corner of Focus Area 1. At its deepest point, the intersection with a northwest-trending graben there is favorable for enhanced permeability associated with intersecting faults. Processing and modeling of the gravity data collected during 2011 provide a good understanding of graben depth and distribution of faults bounding the graben and has focused the interest area of the study. Down-hole logging of temperatures in wells made available near the Intrepid, Inc., evaporation ponds, just north of Focus Area 1, provide a good understanding of the variability of thermal gradients in that …
Date:
April 1, 2012
Creator:
Richard P. Smith, PhD., PG; Robert P. Breckenridge, PhD. & Thomas R. Wood, PhD.
Object Type:
Report
System:
The UNT Digital Library
Assessment of Possible Cycle Lengths for Fully-Ceramic Micro-Encapsulated Fuel-Based Light Water Reactor Concepts
The tri-isotropic (TRISO) fuel developed for High Temperature reactors is known for its extraordinary fission product retention capabilities [1]. Recently, the possibility of extending the use of TRISO particle fuel to Light Water Reactor (LWR) technology, and perhaps other reactor concepts, has received significant attention [2]. The Deep Burn project [3] currently focuses on once-through burning of transuranic fissile and fissionable isotopes (TRU) in LWRs. The fuel form for this purpose is called Fully-Ceramic Micro-encapsulated (FCM) fuel, a concept that borrows the TRISO fuel particle design from high temperature reactor technology, but uses SiC as a matrix material rather than graphite. In addition, FCM fuel may also use a cladding made of a variety of possible material, again including SiC as an admissible choice. The FCM fuel used in the Deep Burn (DB) project showed promising results in terms of fission product retention at high burnup values and during high-temperature transients. In the case of DB applications, the fuel loading within a TRISO particle is constituted entirely of fissile or fissionable isotopes. Consequently, the fuel was shown to be capable of achieving reasonable burnup levels and cycle lengths, especially in the case of mixed cores (with coexisting DB and regular …
Date:
April 1, 2012
Creator:
Sen, R. Sonat; Pope, Michael A.; Ougouag, Abderrafi M. & Pasamehmetoglu, Kemal O.
Object Type:
Article
System:
The UNT Digital Library
ASSESSMENT OF POSSIBLE CYCLE LENGTHS FOR FULLY-CERAMIC MICRO-ENCAPSULATED FUEL-BASED LIGHT WATER REACTOR CONCEPTS
The use of TRISO-particle-based dispersion fuel within SiC matrix and cladding materials has the potential to allow the design of extremely safe LWRs with failure-proof fuel. This paper examines the feasibility of LWR-like cycle length for such a low enriched uranium fuel with the imposed constraint of strictly retaining the original geometry of the fuel pins and assemblies. The motivation for retaining the original geometry is to provide the ability to incorporate the fuel 'as-is' into existing LWRs while retaining their thermal-hydraulic characteristics. The feasibility of using this fuel is assessed by looking at cycle lengths and fuel failure rates. Other considerations (e.g., safety parameters, etc.) were not considered at this stage of the study. The study includes the examination of different TRISO kernel diameters without changing the coating layer thicknesses. The study shows that a naive use of UO{sub 2} results in cycle lengths too short to be practical for existing LWR designs and operational demands. Increasing fissile inventory within the fuel compacts shows that acceptable cycle lengths can be achieved. In this study, starting with the recognized highest packing fraction practically achievable (44%), higher enrichment, larger fuel kernel sizes, and the use of higher density fuels have been …
Date:
April 1, 2012
Creator:
Sen, R. Sonat; Pope, Michael A.; Ougouag, Abderrafi M.; Pasamehmetoglu, Kemal & Venneri, Francesco
Object Type:
Article
System:
The UNT Digital Library
Assessment of the SRI Gasification Process for Syngas Generation with HTGR Integration -- White Paper
This white paper is intended to compare the technical and economic feasibility of syngas generation using the SRI gasification process coupled to several high-temperature gas-cooled reactors (HTGRs) with more traditional HTGR-integrated syngas generation techniques, including: (1) Gasification with high-temperature steam electrolysis (HTSE); (2) Steam methane reforming (SMR); and (3) Gasification with SMR with and without CO2 sequestration.
Date:
April 1, 2012
Creator:
Gandrik, A.M.
Object Type:
Report
System:
The UNT Digital Library
The assumption of a reliable instrument and other pitfalls to avoid when considering the reliability of data
This article helps researchers avoid common pitfalls associated with reliability including incorrectly assuming that measurement error always attenuates observed score correlations, different sources of measurement error originate from the same source, and reliability is a function of instrumentation.
Date:
April 12, 2012
Creator:
Nimon, Kim F.; Zientek, Linda Reichwein & Henson, Robin K.
Object Type:
Article
System:
The UNT Digital Library
Atmospheric Radiation Measurement Climate Research Facility Operations Quarterly Report January 1–March 31, 2012
Individual raw datastreams from instrumentation at the Atmospheric Radiation Measurement (ARM) Climate Research Facility fixed and mobile sites are collected and sent to the Data Management Facility (DMF) at Pacific Northwest National Laboratory (PNNL) for processing in near real-time. Raw and processed data are then sent approximately daily to the ARM Data Archive, where they are made available to the research community. For each instrument, we calculate the ratio of the actual number of processed data records received daily at the Archive to the expected number of data records. The results are tabulated by (1) individual datastream, site, and month for the current year and (2) site and fiscal year (FY) dating back to 1998.
Date:
April 13, 2012
Creator:
Voyles, J. W.
Object Type:
Text
System:
The UNT Digital Library
Attention Black College Women: "It Is Time To Think Twice Before You Make That Choice!"
Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on African American women on college campuses. This research consists of studying African American women on college campuses and discerning what psychological components encourage them to have premarital sex.
Date:
April 19, 2012
Creator:
Yasmeen, Frazier & Verrill, Diane
Object Type:
Poster
System:
The UNT Digital Library
[Audience member pointing his finger]
Photograph of an audience member pointing his finger, taken at a 24-Hour FilmFeast event featuring Vondie Curtis Hall, sponsored by The Black Academy of Arts and Letters, event was held at the Dallas Convention Center Theater Complex in Dallas, Texas.
Date:
April 28, 2012
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Audience member sitting down]
Photograph of an audience member sitting down, taken at a 24-Hour FilmFeast event featuring Vondie Curtis Hall, sponsored by The Black Academy of Arts and Letters, event was held at the Dallas Convention Center Theater Complex in Dallas, Texas.
Date:
April 28, 2012
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Audience members stare toward the stage]
Photograph of the audience members staring toward the stage, taken at a 24-Hour FilmFeast event featuring Vondie Curtis Hall, sponsored by The Black Academy of Arts and Letters, event was held at the Dallas Convention Center Theater Complex in Dallas, Texas.
Date:
April 28, 2012
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Audience sitting in chairs]
Photograph of the audience sitting in chairs, taken at a 24-Hour FilmFeast event featuring Vondie Curtis Hall, sponsored by The Black Academy of Arts and Letters, event was held at the Dallas Convention Center Theater Complex in Dallas, Texas.
Date:
April 28, 2012
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Audinece sits while looking toward the stage]
Photograph of the audience sitting while looking toward the stage, taken at a 24-Hour FilmFeast event featuring Vondie Curtis Hall, sponsored by The Black Academy of Arts and Letters, event was held at the Dallas Convention Center Theater Complex in Dallas, Texas.
Date:
April 28, 2012
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
An Audit Report on Certification of the Permanent School Fund's Bond Guarantee Program for Fiscal Year 2011
Report of the Texas State Auditor's Office related to the total amount of school district bonds guaranteed by the Permanent School Fund's (Fund) Bond Guarantee Program (Program), whether these were within the limits established by Section 45.053(a) and (d) of the Texas Education Code and the Internal Revenue Service (IRS), and recent changes made to the Program's rules and statutes.
Date:
April 2012
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Selected Groundwater Conservation Districts
Report of the Texas State Auditor's Office related to determining whether selected groundwater conservation districts complied with applicable statutes and to summarizing information from districts' audited annual financial statements.
Date:
April 2012
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Aviation Safety: FAA Is Taking Steps to Improve Data, but Challenges for Managing Safety Risks Remain
Testimony issued by the Government Accountability Office with an abstract that begins "The Federal Aviation Administration (FAA) uses data reactively and proactively to prevent accidents and manage safety risks. For instance, since 1998, FAA has partnered with the airline industry to identify precursors and contributing factors, and ensure that efforts to improve safety focus on the most prevalent categories of accidents and formulate an intervention strategy designed to reduce recurrences. Although FAA plans to continue using data reactively to understand the causes of accidents and incidents, as part of its adoption of Safety Management Systems (SMS), it is shifting to a proactive approach in which it analyzes data to identify and mitigate risks before they result in accidents."
Date:
April 25, 2012
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Awareness of Aphasia and Aphasia Services in South India: Public Health Implications
This paper discusses research on aphasia, a language disorder resulting from brain damage.
Date:
April 19, 2012
Creator:
Chazhikat, Emlynn & Olness, Gloria Streit
Object Type:
Paper
System:
The UNT Digital Library
Awareness of Aphasia and Aphasia Services in South India: Public Health Implications [Presentation]
Presentation for the 2012 University Scholars Day at the University of North Texas. This presentation discusses a study on the levels of public awareness of aphasia and access to aphasia-related services in an urban area of the State of Kerala, India, a region with potentially high incidence and prevalence of aphasia.
Date:
April 19, 2012
Creator:
Chazhikat, Emlynn & Olness, Gloria Streit
Object Type:
Presentation
System:
The UNT Digital Library
Axial couplings and strong decay widths of heavy hadrons
We calculate the axial couplings of mesons and baryons containing a heavy quark in the static limit using lattice QCD. These couplings determine the leading interactions in heavy hadron chiral perturbation theory and are central quantities in heavy quark physics, as they control strong decay widths and the light-quark mass dependence of heavy hadron observables. Our analysis makes use of lattice data at six different pion masses, 227 MeV < m{sub {pi}} < 352 MeV, two lattice spacings, a = 0.085, 0.112 fm, and a volume of (2.7 fm){sup 3}. Our results for the axial couplings are g{sub 1} = 0.449(51), g{sub 2} = 0.84(20), and g{sub 3} = 0.71(13), where g{sub 1} governs the interaction between heavy-light mesons and pions and g{sub 2,3} are similar couplings between heavy-light baryons and pions. Using our lattice result for g{sub 3}, and constraining 1/m{sub Q} corrections in the strong decay widths with experimental data for {Sigma}{sub c}{sup (*)} decays, we obtain {Gamma}[{Sigma}{sub b}{sup (*)} {yields} {Lambda}{sub b} {pi}{sup {+-}}] = 4.2(1.0), 4.8(1.1), 7.3(1.6), 7.8(1.8) MeV for the {Sigma}{sub b}{sup +}, {Sigma}{sub b}{sup -}, {Sigma}{sub b}{sup *+}, {Sigma}{sub b}{sup *-} initial states, respectively. We also derive upper bounds on the widths of the …
Date:
April 1, 2012
Creator:
William Detmold, C.-J. David Lin, Stefan Meinel
Object Type:
Article
System:
The UNT Digital Library
B+ and D(S)+ Decay Constants from Belle and BaBar
The Belle and Babar experiments have measured the branching fractions for B{sup +} {yields} {tau}{sup +}{nu} and D{sub s}{sup +} {yields} {mu}{sup +}{nu} decays. From these measurements one can extract the B{sup +} and D{sub s}{sup +} decay constants, which can be compared to lattice QCD calculations. For the D{sub s}{sup +} decay constant, there is currently a 2.1 {sigma} difference between the calculated value and the measured value.
Date:
April 9, 2012
Creator:
Schwartz, A.J. & U., /Cincinnati
Object Type:
Article
System:
The UNT Digital Library
Bahrain: Reform, Security, and U.S. Policy
This report discusses the current state of Bahrain, which has undergone substantial political reforms since the late 1990s, but which still suffers from tension between the Shiite majority and the Sunni-led government. This report focuses particularly on Bahrain's relationship with Iran and Bahrain's relationship with the United States.
Date:
April 13, 2012
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Ballast Water Management to Combat Invasive Species
This report is on Ballast Water Management to Combat Invasive Species.
Date:
April 10, 2012
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library