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1,073 Matching Results
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Depressed electron collector for the Gatling Gun Test Stand
N/A
Date:
October 24, 2013
Creator:
A., Pikin; Ben-Zvi, Ilan; Chang, X. Y.; Gassner, D.; Litvinenko, V.; Rahman, O. et al.
Object Type:
Report
System:
The UNT Digital Library
LEEM investigations of clean surfaces driven by energetic ion beams
The original purpose of this award was to use low‐energy electron microscopy (LEEM) to explore the dynamics of surfaces of clean single crystal surfaces when driven by a beam of energetic ions. The goal was to understand the nanoscience of hyperthermal growth, surface erosion by sublimation and irradiation, operation of surface sinks in irradiated materials, diffusion on driven surfaces, and the creation of structural patterns. This project was based on a novel LEEM system constructed by C. P. Flynn, which provided real‐time imaging of surface dynamics by scattering low energy electrons. With the passing of Prof. Flynn in late 2011, this project was completed under a slightly different scope by constructing a low‐energy, inelastic electron scattering (�EELS�) instrument. Consistent with Flynn�s original objectives for his LEEM system, this device probes the dynamics of crystal surfaces. However the measurements are not carried out in real time, but instead are done in the frequency domain, through the energy lost from the probe electrons. The purpose of this device is to study the collective bosonic excitations in a variety of materials, including high temperature superconductors, topological insulators, carbon allotropes including (but not limited to) graphene, etc. The ultimate goal here is to identify …
Date:
April 24, 2013
Creator:
Abbamonte, Peter M.
Object Type:
Report
System:
The UNT Digital Library
A METHODOLOGY FOR DETERMINING THE DOSE RATE FOR BOUNDING MASS LIMITS IN A 9977 PACKAGING
The Small Gram Quantity (SGQ) concept is based on the understanding that the hazards associated with the shipment of a radioactive material are directly proportional to its mass. This study describes a methodology that estimates the acceptable masses for several neutron and gamma emitting isotopes that can be shipped in a 9977 Package compliant with the Title 10 of the Code of Federal Regulations, Part 71 (10CFR71) external radiation level limits. 10CFR71.33 states that a shipping application identifies the radioactive and fissile materials at their maximum quantity and provides an evaluation demonstrating compliance with the external radiation standards. Since rather small amounts of some isotopes emit sufficiently strong radiation to produce a large external dose rate, quantifying of the dose rate for a proposed content is a challenging issue for the SGQ approach. It is essential to quantify external radiation levels from several common gamma and neutron sources that can be safely placed in a specific packaging, to ensure compliance with federal regulations. A methodology was established for determining the dose rate for bounding mass limits for a set of isotopes in the Model 9977 Shipping Package. Calculations were performed to estimate external radiation levels using the MCNP radiation transport …
Date:
May 24, 2012
Creator:
Abramczyk, G.; Bellamy, S.; Nathan, S. & Loftin, B.
Object Type:
Article
System:
The UNT Digital Library
INDEPENDENT VERIFICATION SURVEY REPORT FOR THE OPERABLE UNIT-1 LANDFILL TRENCHES, MIAMISBURG CLOSURE PROJECT
INDEPENDENT VERIFICATION SURVEY REPORT FOR THE OPERABLE UNIT-1 LANDFILL TRENCHES, MIAMISBURG CLOSURE PROJECT, MIAMISBURG, OHIO DCN: 0468-SR-02-0
Date:
May 24, 2010
Creator:
Adams, W. C.
Object Type:
Report
System:
The UNT Digital Library
LETTER REPORT. INDEPENDENT CONFIRMATORY SURVEY RESULTS OF SOILS ASSOCIATED WITH THE ARGYLE STREET SEWER LINE AT THE UNITED NUCLEAR CORPORATION NAVAL PRODUCTS SITE, NEW HAVEN, CONNECTICUT
Oak Ridge Institute for Science and Education (ORISE) personnel visited the United Nuclear Corporation (UNC) Naval Products site on three separate occasions during the months of October and November 2011. The purpose of these visits was to conduct confirmatory surveys of soils associated with the Argyle Street sewer line that was being removed. Soil samples were collected from six different, judgmentally determined locations in the Argyle Street sewer trench. In addition to the six soil samples collected by ORISE, four replicate soil samples were collected by Cabrera Services, Inc. (CSI) for analysis by the ORISE laboratory. Replicate samples S0010 and S0011 were final status survey (FSS) bias samples; S0012 was an FSS systematic sample; and S0015 was a waste characterization sample. Six soil samples were also collected for background determination. Uranium-235 and uranium-238 concentrations were determined via gamma spectroscopy; the spectra were also reviewed for other identifiable photopeaks. Radionuclide concentrations for these soil samples are provided. In addition to the replicate samples and the samples collected by ORISE, CSI submitted three soil samples for inter-laboratory comparison analyses. One sample was from the background reference area, one was from waste characterization efforts (material inside the sewer line), and one was a …
Date:
January 24, 2012
Creator:
Adams, Wade C.
Object Type:
Report
System:
The UNT Digital Library
U.S.-India Trade Relations
This report discusses trade relations between the United States and India. Many observers believe bilateral commercial ties could be more extensive if trade and investment barriers were addressed.
Date:
October 24, 2018
Creator:
Akhtar, Shayerah Ilias & Kronstadt, K. Alan
Object Type:
Report
System:
The UNT Digital Library
Report of the First Confidence Building Exercise For Biomedical Sample Analysis
We participated in the first exercise to build confidence in the analysis of biomedical samples for trace levels of CW agents and/or their degradation, reaction or metabolites.
Date:
February 24, 2010
Creator:
Alcaraz, A. & Gregg, H.
Object Type:
Report
System:
The UNT Digital Library
ION EXCHANGE PERFORMANCE OF TITANOSILICATES, GERMANATES AND CARBON NANOTUBES
This report presents a summary of testing the affinity of titanosilicates (TSP), germanium-substituted titanosilicates (Ge-TSP) and multiwall carbon nanotubes (MWCNT) for lanthanide ions in dilute nitric acid solution. The K-TSP ion exchanger exhibited the highest affinity for lanthanides in dilute nitric acid solutions. The Ge-TSP ion exchanger shows promise as a material with high affinity, but additional tests are needed to confirm the preliminary results. The MWCNT exhibited much lower affinities than the K-TSP in dilute nitric acid solutions. However, the MWCNT are much more chemically stable to concentrated nitric acid solutions and, therefore, may candidates for ion exchange in more concentrated nitric acid solutions. This technical report serves as the deliverable documenting completion of the FY13 research milestone, M4FT-13SR0303061 – measure actinide and lanthanide distribution values in nitric acid solutions with sodium and potassium titanosilicate materials.
Date:
April 24, 2013
Creator:
Alsobrook, A. & Hobbs, D.
Object Type:
Report
System:
The UNT Digital Library
Ion Separation Effects in Mixed-Species Ablator and Fuels for Inertial Confinement Fusion Implosions
None
Date:
June 24, 2013
Creator:
Amendt, P.; Bellei, C.; Ross, J. S.; Salmonson, J. & Wilks, S.
Object Type:
Article
System:
The UNT Digital Library
A Seemingly Simple Task: Filling a Solenoid Volume in Vacuum with Dense Plasma
Space-charge neutralization of a pulsed, high-current ion beam is required to compress and focus the beam on a target for warm dense matter physics or heavy ion fusion experiments. We described attempts to produce dense plasma in and near the final focusing solenoid through which the ion beam travels, thereby providing an opportunity for the beam to acquire the necessary charge-compensating electrons. Among the options are plasma injection from four pulsed vacuum arc sources located outside the solenoid, and using a high current (> 4 kA) pulsed vacuum arc plasma from a ring cathode near the edge of the solenoid. The plasma distribution is characterized by photographic means and by an array of movable Langmuir probes. The plasma is produced at several cathode spots distributed azimuthally on the ring cathode. Beam neutralization and compression are accomplished, though issues of density, uniformity, and pulse-to-pulse reproducibly remain to be solved.
Date:
June 24, 2010
Creator:
Anders, Andre; Kauffeldt, Marina; Roy, Prabir & Oks, Efim
Object Type:
Article
System:
The UNT Digital Library
TORUS: Theory of Reactions for Unstable iSotopes Annual Continuation and Progress Report Year-2: March 1, 2011 - February 29, 2012
The TORUS collaboration derives its name from the research it focuses on, namely the Theory of Reactions for Unstable iSotopes. It is a Topical Collaboration in Nuclear Theory, and funded by the Nuclear Theory Division of the Office of Nuclear Physics in the Office of Science of the Department of Energy. The funding supports one postdoctoral researcher for the years 1 through 3. The collaboration brings together as Principal Investigators a large fraction of the nuclear reaction theorists currently active within the USA. The mission of the TORUS Topical Collaboration is to develop new methods that will advance nuclear reaction theory for unstable isotopes by using three-body techniques to improve direct-reaction calculations, and, by using a new partial-fusion theory, to integrate descriptions of direct and compound-nucleus reactions. This multi-institution collaborative effort is directly relevant to three areas of interest: the properties of nuclei far from stability; microscopic studies of nuclear input parameters for astrophysics, and microscopic nuclear reaction theory.
Date:
February 24, 2012
Creator:
Arbanas, Goran; Elster, Charlotte; Escher, Jutta; Mukhamedzanov, Akram; Nunes, Filomena & Thompson, Ian J.
Object Type:
Report
System:
The UNT Digital Library
TORUS: Theory of Reactions for Unstable iSotopes - Year 1 Continuation and Progress Report
The TORUS collaboration derives its name from the research it focuses on, namely the Theory of Reactions for Unstable iSotopes. It is a Topical Collaboration in Nuclear Theory, and funded by the Nuclear Theory Division of the Office of Nuclear Physics in the Office of Science of the Department of Energy. The funding started on June 1, 2010, it will have been running for nine months by the date of submission of this Annual Continuation and Progress Report on March 1, 2011. The extent of funding was reduced from the original application, and now supports one postdoctoral researcher for the years 1 through 3. The collaboration brings together as Principal Investigators a large fraction of the nuclear reaction theorists currently active within the USA. The mission of the TORUS Topical Collaboration is to develop new methods that will advance nuclear reaction theory for unstable isotopes by using three-body techniques to improve direct-reaction calculations, and, by using a new partial-fusion theory, to integrate descriptions of direct and compound-nucleus reactions. This multi-institution collaborative effort is directly relevant to three areas of interest: the properties of nuclei far from stability; microscopic studies of nuclear input parameters for astrophysics, and microscopic nuclear reaction theory.
Date:
February 24, 2011
Creator:
Arbanas, Goran; Elster, Charlotte; Escher, Jutta; Mukhamedzhanov, Akram; Nunes, Filomena & Thompson, Ian J.
Object Type:
Report
System:
The UNT Digital Library
The European Union: Questions and Answers
This report serves as a primer on the European Union (EU) and provides a brief description of U.S.-EU relations that may be of interest in the 114th Congress. The EU is a political and economic partnership that represents a unique form of cooperation among sovereign countries, comprising 28 member states, including most of the countries of Central and Eastern Europe; the group has helped to promote peace, stability, and economic prosperity throughout the European continent.
Date:
July 24, 2015
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
The European Union: Questions and Answers
This report provides a brief overview of the European Union (EU), an economic and political partnership between 27 sovereign member states. The report describes the formation of the EU, the three main institutions of the EU, and the EU's relationship with the United States.
Date:
January 24, 2011
Creator:
Archick, Kristin & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
Democratic Republic of Congo: Background and U.S. Policy
This report reviews the status of the Democratic Republic of the Congo peace process, provides background on recent conflicts in the Congo, briefly summarizes the political history that led to these conflicts, and assesses prospects for the future. It also describes relevant U.S. policy and congressional involvement.
Date:
February 24, 2014
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Democratic Republic of Congo: Background and U.S. Relations
This report gives an overview of the background and current developments of the Democratic Republic of Congo
Date:
July 24, 2015
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Guinea: Background and Relations with the United States
This report discusses the current political conditions in Guinea, as well as the considerable changes to Guinea's political landscape that have taken place over the past two years. The report also discusses U.S. interests and associated policy challenges in Guinea, centering around democratization, counternarcotics issues, regional stability, and socioeconomic development, among other issues.
Date:
November 24, 2010
Creator:
Arieff, Alexis & Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
MODIS Airborne simulator (MAS) Final Report for CLASIC
The MAS was flown aboard the NASA ER-2 for the CLASIC field experiment, and for all data collected, provided calibrated and geolocated (Level-1B) radiance data for it’s 50 spectral bands (ranging in wavelength for 0.47 to 14.3 µm). From the Level-1B data, as directed in the Statement of Work, higher order (Level-2) data products were derived. The Level-2 products include: a) cloud optical thickness, b) cloud effective radius, c) cloud top height (temperature), d) cloud fraction, e) cloud phase products. Preliminary Level-1B and Level-2 products were provided during the field experiment (typically within one or two days of data collection). Final version data products were made available in December 2008 following considerable calibration analysis. Data collection, data processing (to Level-2), and discussion of the calibration work are summarized below.
Date:
November 24, 2010
Creator:
Arnold, Thomas & Platnick, Steven
Object Type:
Report
System:
The UNT Digital Library
Transatlantic Perspectives on Defense Innovation: Issues for Congress
This report discusses defense innovation and technology research and development in the American, British, French, and German military and ways to use implement such innovations into NATO forces.
Date:
April 24, 2018
Creator:
Aronsson, Lisa A.
Object Type:
Report
System:
The UNT Digital Library
Opportunities for Drell-Yan Physics at RHIC
Drell-Yan (DY) physics gives the unique opportunity to study the parton structure of nucleons in an experimentally and theoretically clean way. With the availability of polarized proton-proton collisions and asymmetric d+Au collisions at the Relativistic Heavy Ion Collider (RHIC), we have the basic (and unique in the world) tools to address several fundamental questions in QCD, including the expected gluon saturation at low partonic momenta and the universality of transverse momentum dependent parton distribution functions. A Drell-Yan program at RHIC is tied closely to the core physics questions of a possible future electron-ion collider, eRHIC. The more than 80 participants of this workshop focused on recent progress in these areas by both theory and experiment, trying to address imminent questions for the near and mid-term future.
Date:
May 24, 2011
Creator:
Aschenauer, E.; Bland, L.; Crawford, H.; Goto, Y.; Eyser, O.; Kang, Z. et al.
Object Type:
Report
System:
The UNT Digital Library
Domestic Food Assistance in 112th Congress 2012 Farm Bill Proposals: S. 3240 and H.R. 6083
This report focuses on the Nutrition title of the 2012 farm bill proposals included in the 112th Congress's Senate-passed bill and House Committe-reported bill.
Date:
January 24, 2013
Creator:
Aussenberg, Randy Alison
Object Type:
Report
System:
The UNT Digital Library
SNAP and Related Nutrition Provisions of the 2014 Farm Bill (P.L. 113-79)
This report discusses the Nutrition Title (Title IV) of the enacted 2014 farm bill. As Congress formulated the Nutrition provisions of the 2014 farm bill.
Date:
April 24, 2014
Creator:
Aussenberg, Randy Alison
Object Type:
Report
System:
The UNT Digital Library
Discretionary Budget Authority by Subfunction: An Overview
This report provides a graphical overview of historical trends in discretionary budget authority (BA) from FY1976 through FY2012, preliminary estimates for FY2013 spending, and the levels consistent with the President's proposals for FY2014 through FY2018 using data from President Obama's FY2014 budget submission that was released on April 10, 2013.
Date:
January 24, 2014
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Trends in Discretionary Spending
This report provides a graphical overview of historical trends in discretionary budget authority (BA) from FY1976 through FY2011, enacted levels for FY2012 spending, and the levels consistent with President Obama's proposals for FY2013 through FY2017. It also includes a background on functional categories and a section discussing historical spending trends.
Date:
January 24, 2014
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library