Resource Type
Partner
Collection
Office of Scientific & Technical Information Technical Reports
1,885
Congressional Research Service Reports
1,310
Technical Report Archive and Image Library
388
Government Accountability Office Reports
237
National Advisory Committee for Aeronautics Collection
208
TRAIL Microcard Collection
136
Texas State Publications
32
Harris and Eliza Kempner
24
John F. Kennedy Memorial Collection
7
John F. Kennedy, Dallas Police Department Collection
7
16 More
Serial/Series Title
NACA Research Memorandums
181
CRS Issue Briefs
74
Atomic Energy Commission Reports
66
Hanford Works Reports
32
HW (Series)
27
NACA Technical Reports
25
Personal Papers (MS 80-0002)
24
University of California Radiation Laboratory Reports
23
109th Congress
21
Oak Ridge National Laboratory Reports
19
189 More
Degree Discipline
Country
States
Decade
Month
Day
Language
Modified tubular support patterns: Ribbed and ribless process tubes
Reactor support charge designs and patterns have been numerous and varied over the past few years, the basis for acceptance of a particular support loading being determined from a consideration of fabrication costs and the hydraulic characteristics of the proposed dummy load as it applies to a particular reactor. Since the first three or four dummy pieces downstream of the fuel column (and upstream of the column in a spline tube) are discarded after the irradiation process, it is desirable to use tubular dummies for this portion of the support charge which are less expensive to fabricate and which are easily identified during the charging-discharging process. However, there exists a remote possibility that one or more tubular pieces could be inadvertently placed in a rear nozzle resulting in a flow restriction in the process tube. These arrangements of tubular support pieces in the dummy pattern, i.e., tubulars positioned against the fuel column and/or in the process tube rear nozzles, have been hydraulically tested to determine if there is adequate and unrestricted flow at normal operating header pressures.
Date:
August 25, 1964
Creator:
Angle, C. W.
System:
The UNT Digital Library
An Innovative Reactor Analysis Methodology Based on a Quasidiffusion Nodal Core Model. Quarterly Technical Progress Report, April 1 - June 30, 2000
The status summary of Nuclear Energy Research Initiative (NERI) Tasks - Phase 1 are: Task 1--The development of the following methods in 1D slab geometry: (1) Homogenization and definition of discontinuity factors, (2) Group constants functionalization using assembly transport solution of multigroup eigenvalue problem with albedo boundary conditions, and (3) solving coarse-mesh effective few-group 1D QD moment equations using tables of data parameterized with respect to the ratio {rvec n} {center_dot} {rvec J}{sup G}/{tilde {phi}{sup G}} on boundaries. Status summary of NERI Tasks - Phase 1: Task 2--Development of a numerical method for solving the 2D few-group moment QD equations: (1) Development of a nodal discretization method for 2D moment QD equations, and (2) Development of an efficient iteration method for solving the system of equations of the nodal discretization method for 2D moment QD equations.
Date:
July 25, 2000
Creator:
Anistratov, Dmitriy Y.; Adams, Marvin L.; Palmer, Todd S. & Smith, Kord S.
System:
The UNT Digital Library
A Program of Basic Research on Mechanical Properties of Reactor Materials. Quarterly Progress Report Ending January 31# 1965
None
Date:
February 25, 1965
Creator:
Appel, J.C.; Chambers, R.H. & Trozera, T.A.
System:
The UNT Digital Library
Neutron Remote Area Monitoring Systems
The following report records measurements and evaluations of fast neutron levels in remote areas monitored by personnel.
Date:
April 25, 1958
Creator:
Appleby, Charles W.
System:
The UNT Digital Library
Final Technical Report for Award DE-FG02-05ER41389 A New Electrostatically-Focused, UV HPD for Liquid Xenon: A Direct Comparison with APD, PMT, SiPM in an Integrated Database
Within the scope of the project, a LXe detector and associated gas handling and purification system were set up to study the response of various photodetectors to the VUV Xe light. In particular we tested an Advanced Photonix Large Area Avalanche Photodiode (APD), Silicon Photomultipliers (SiPMs) from two different sources and an Hamamtsu Photonics APD. As part of the XENON Dark Matter project, sponsored by the National Science Foundation, we have accumulated independent knowledge of the response of compact metal channel photomultipliers. At this stage, we conclude that the last are far superior in terms of reliability and performance in a LXe detector environment. More studies are needed with APDs and SiPMs in LXe, taking advantage of the improved performance of these sensors with time. We could not test a hybrid PMT (HPD) since the only available unit on loan from one manufacturer lacked the mechanical stability and was packaged in a form not compatible with LXe purity requirements. Meanwhile, within the XENON collaboration, we are developing with Hamamatsu a hybrid PMT which is named QUPID (Quartz Photon Intensifying Detector) which promises to solve the problems of radioactivity and purity encountered with previous HPDs. We attach to this report two …
Date:
August 25, 2009
Creator:
Aprile, Elena
System:
The UNT Digital Library
The European Parliament
This report discusses the construction and history of the European Parliament (EP), its role in functions of the EU as well as internationally, various international supports and criticisms of the EP, and the EP's ties with the U.S. Congress.
Date:
February 25, 2010
Creator:
Archick, Kristin & Mix, Derek E.
System:
The UNT Digital Library
The European Union: Questions and Answers
This report provides a summary overview of issues regarding the relationship between the United States and the EU, many of which may be of interest to the second session of the 111th Congress. The global financial crisis and recession has challenged both sides to forge a common response. The United States and EU have a number of lingering trade disputes, but have led the push to liberalize world trade, and have sought to reduce non-tariff and regulatory barriers in the transatlantic marketplace.
Date:
February 25, 2010
Creator:
Archick, Kristin & Mix, Derek E.
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:
August 25, 2010
Creator:
Archick, Kristin & Mix, Derek E.
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:
September 25, 2009
Creator:
Archick, Kristin & Mix, Derek E.
System:
The UNT Digital Library
European Union Enlargement
This report discusses the EU's enlargement process, which it views as a historic opportunity to promote stability and prosperity in Europe. On May 1, 2004, Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia joined the European Union (EU), enlarging the Union to 25 members.
Date:
October 25, 2006
Creator:
Archick, Kristin & Morelli, Vincent L.
System:
The UNT Digital Library
Senegal: Background and U.S. Relations
This report covers the background, recent politics, governant, and economy of Senegal. It also looks at security and human rights issues and Senegal's ties with France and the Middle East. It ends with a look at U.S. - Senegal relations.
Date:
March 25, 2011
Creator:
Arieff, Alexis
System:
The UNT Digital Library
Sexual Violence in African Conflicts
This report focuses on current conflicts in Africa in which sexual violence is reported to be widespread or systematic. It describes the context in which such violence takes place, selected cases where it is currently occurring, and U.S. policy responses. It concludes with a discussion of potential policy considerations for Congress.
Date:
November 25, 2009
Creator:
Arieff, Alexis
System:
The UNT Digital Library
The Global Economic Crisis: Impact on Sub-Saharan Africa and Global Policy Responses
This report analyzes Africa's vulnerability to the global crisis and potential implications for economic growth, poverty alleviation, fiscal balances, and political stability. The report describes channels through which the crisis is affecting Africa, and provides information on international efforts to address the impact, including U.S. policies and those of multilateral institutions in which the United States plays a major role.
Date:
August 25, 2009
Creator:
Arieff, Alexis; Weiss, Martin A. & Jones, Vivian C.
System:
The UNT Digital Library
An Isochronal Differential Microcalorimeter
An isochronal differential-type microcalorimeter has been designed and constructed. As a result of its simple design it is very easy to handle the samples and assemble the calorimeter. Important to the operation of the calorimeter is a program, also working on the differential principle, that provides linear temperature rise of the samples. This calorimeter is used to measure very small energy releases such as those found in precipitation, stored energy, etc. It is demonstrated that the calorimeter is easily capable of measuring 0.0005 cal with a probable error of the order of 1% to 2%.
Date:
February 25, 1963
Creator:
Arndt, R. A. & Fujita, F. E.
System:
The UNT Digital Library
Compatible Spatial Discretizations for Partial Differential Equations
From May 11--15, 2004, the Institute for Mathematics and its Applications held a hot topics workshop on Compatible Spatial Discretizations for Partial Differential Equations. The numerical solution of partial differential equations (PDE) is a fundamental task in science and engineering. The goal of the workshop was to bring together a spectrum of scientists at the forefront of the research in the numerical solution of PDEs to discuss compatible spatial discretizations. We define compatible spatial discretizations as those that inherit or mimic fundamental properties of the PDE such as topology, conservation, symmetries, and positivity structures and maximum principles. A wide variety of discretization methods applied across a wide range of scientific and engineering applications have been designed to or found to inherit or mimic intrinsic spatial structure and reproduce fundamental properties of the solution of the continuous PDE model at the finite dimensional level. A profusion of such methods and concepts relevant to understanding them have been developed and explored: mixed finite element methods, mimetic finite differences, support operator methods, control volume methods, discrete differential forms, Whitney forms, conservative differencing, discrete Hodge operators, discrete Helmholtz decomposition, finite integration techniques, staggered grid and dual grid methods, etc. This workshop seeks to foster …
Date:
November 25, 2004
Creator:
Arnold, Douglas, N.
System:
The UNT Digital Library
Design of a positional reference system for ultraprecision machining
The primary goal for an ultraprecision turning machine is to have the capability to position precisely the cutting points of a tool along a defined contour with respect to the part. In order to accomplish this goal, the use of a stable-positional-reference system has become apparent. Several efforts have been made by representatives of the diamond-turning community to design such a needed reference system. Efforts made at Y-12 to design the needed system are reviewed.
Date:
September 25, 1979
Creator:
Arnold, J. B.; Burleson, R. R. & Pardue, R. M.
System:
The UNT Digital Library
IRRADIATION PERFORMANCE OF PIQUA CORE I FUEL ELEMENTS
None
Date:
May 25, 1966
Creator:
Arnold, J.L.
System:
The UNT Digital Library
Bromine Exchange in Graphite-Bromine Lamellar Compounds
A kinetic study of the exchange of normal and radioactive bromine in graphite-bromine lamellar compounds has been made at temperatures of 30° to 50°C. Natural and synthetic graphite powders were investigated. Two alternative mechanisms for the exchange, volume diffusion and surface exchange, were considered. The data were in better agreement with the diffusion mechanism. Diffusion coefficients of 10 -9 to 10 -8 cm2/sec and an activation energy of 11 to 14 kcal/mole were calculated for the natural graphite powders. The diffusion coefficients increased with increasing bromine content. Reversibly absorbed bromine exchanged more rapidly than irreversibly absorbed bromine.
Date:
February 25, 1963
Creator:
Aronson, Seymour
System:
The UNT Digital Library
Gene expression profiles of Nitrosomonas europaea, an obligate chemolitotroph
Nitrosomonas europaea is an aerobic lithoautotrophic bacterium that uses ammonia (NH3) as its energy source. As a nitrifier, it is an important participant in the nitrogen cycle, which can also influence the carbon cycle. The focus of this work was to explore the genetic structure and mechanisms underlying the lithoautotrophic growth style of N. europaea. Whole genome gene expression: The gene expression profile of cells in exponential growth and during starvation was analyzed using microarrays. During growth, 98% of the genes increased in expression at least two fold compared to starvation conditions. In growing cells, approximately 30% of the genes were expressed eight fold higher, Approximately 10% were expressed more than 15 fold higher. Approximately 3% (91 genes) were expressed to more than 20 fold of their levels in starved cells. Carbon fixation gene expression: N. europaea fixes carbon via the Calvin-Benson-Bassham (CBB) cycle via a type I ribulose bisphosphate carboxylase/oxygenase (RubisCO). This study showed that transcription of cbb genes was up-regulated when the carbon source was limited, while amo, hao and other energy harvesting related genes were down-regulated. Iron related gene expression: Because N. europaea has a relatively high content of hemes, sufficient Fe must be available in the …
Date:
May 25, 2005
Creator:
Arp, Daniel J.
System:
The UNT Digital Library
Coal Bed Methane Primer
During the second half of the 1990's Coal Bed Methane (CBM) production increased dramatically nationwide to represent a significant new source of income and natural gas for many independent and established producers. Matching these soaring production rates during this period was a heightened public awareness of environmental concerns. These concerns left unexplained and under-addressed have created a significant growth in public involvement generating literally thousands of unfocused project comments for various regional NEPA efforts resulting in the delayed development of public and fee lands. The accelerating interest in CBM development coupled to the growth in public involvement has prompted the conceptualization of this project for the development of a CBM Primer. The Primer is designed to serve as a summary document, which introduces and encapsulates information pertinent to the development of Coal Bed Methane (CBM), including focused discussions of coal deposits, methane as a natural formed gas, split mineral estates, development techniques, operational issues, producing methods, applicable regulatory frameworks, land and resource management, mitigation measures, preparation of project plans, data availability, Indian Trust issues and relevant environmental technologies. An important aspect of gaining access to federal, state, tribal, or fee lands involves education of a broad array of stakeholders, including …
Date:
May 25, 2005
Creator:
Arthur, Dan; Langhus, Bruce & Seekins, Jon
System:
The UNT Digital Library
K Basin sludge polychlorinated biphenyl removal technology assessment
The two Hanford K Basins are water-filled concrete pools that contain over 2,100 metric tons of N Reactor fuel elements stored in aluminum or stainless steel canisters. During the time the fuel has been stored, approximately 50 m3 of heterogeneous solid material have accumulated in the basins. This material, referred to as sludge, is a mixture of fuel corrosion products, metallic bits of spent fuel and zirconium clad iron and metal corrosion products and silica from migrating sands. Some of the sludges also contain PCBs. The congener group of PCBs was identified as Aroclor 1254. The maximum concentration of sludge PCBS was found to be 140 ppm (as settled wet basis). However, the distribution of the PCBs is non-uniform throughout the sludge (i.e., there are regions of high and low concentrations and places where no PCBs are present). Higher concentrations could be present at various locations. Aroclors 1016/1242, 1221, 1248, 1254, and 1260 were identified and quantified in K West (KW) Canister sludge. In some of these samples, the concentration of 1260 was higher than 1254. The sludge requires pre-treatment to meet tank farm waste acceptance criteria, Among the numerous requirements, the sludge should be retreated so that it does …
Date:
August 25, 1998
Creator:
Ashworth, S. C.
System:
The UNT Digital Library
Development of a 10-bit 500 Msample/sec Waveform Digitizcr
The device reported is a simple, robust, low-cost device to sample fast analog signals and convert them into digital data. Goal is to utilize existingleCroy Front End developments and BNL previous efforts to: Extend the dynamic range from 8 to 9-10 bits; Extend the depth of memory; Lower the cost; and Increase availability to general research and industrial cornmunity.
Date:
September 25, 1996
Creator:
Atiya, M.; Padrazo, D.; Zhao, Y.; Sumner, R.; Untermeyer, U.; Carlson, B. et al.
System:
The UNT Digital Library
Description and Some Safeguard Aspects of Proposed Developmental Fast Neutron Breeder Reactor
Report that generally describes sodium cooled fast reactors, the features and facilities of such a reactor proposed by Atomic Power Development Associates, and then its safety and siting considerations.
Date:
July 25, 1955
Creator:
Atomic Power Development Associates
System:
The UNT Digital Library
EXPERIMENTAL MEASUREMENTS OF THE SUCTION HEAD REQUIRED BY THE HALLAM PROTOTYPE FREE SURFACE SODIUM PUMP
Hydraulic tests were made on the Hallam Prototype Free-Surface Sodium Pump to determine the net positive suction head (NPSH) required at various sodium flow rates. Pump performance data were also collected. The results indicate that an NPSH of 22 ft sodium is required at the design flow rate of 7200 gpm at approximates 1000 deg F, agreeing with computed values, and that the pump is designed with a safety margin of slightly over l0%. (D.L.C.)
Date:
July 25, 1961
Creator:
Atz, R.W.
System:
The UNT Digital Library