Resource Type
Serial/Series Title
NACA Research Memorandums
422
NACA Technical Notes
401
Atomic Energy Commission Reports
369
United States Department of Energy Grand Junction Office Reports
174
United States Geological Survey Reports
139
NACA Technical Memorandums
136
GJBX
133
NACA Wartime Reports
107
Argonne National Laboratory Reports
102
Trace elements investigations report
68
182 More
Country
States
Decade
Month
Language
2,355 Matching Results
Results open in a new window/tab.
Dynamics of Tubes in Fluid with Tube-Baffle Interaction
Three series of tests are performed to evaluate the effects of tube to tube-support-plate (TSP) clearance on tube dynamic characteristics and instability phenomena for tube arrays in crossflow. Test results show that, for relatively large clearances, tubes may possess TSP-inactive modes in which the tubes rattle inside some of the tube-support-plate holes, and that the natural frequencies of TSP-inactive modes are lower than those of TSP-active modes, in which the support plates provide knife-edge type support. Tube response characteristics associated with TSP-inactive modes are sensitive to tube-to-TSP clearance, TSP thickness, excitation amplitude, tube alignment, and the fluid inside the clearance. In addition, tube response is intrinsically nonlinear, with the dominance of TSP-inactive or TSP-active modes depending on the magnitudes of different system parameters. In general, such a system is difficult to model; only a full-scale test can provide all the necessary characteristics. A tube array supported by TSPs with relatively large clearances may be subjected to dynamic instability in some of the TSP-inactive modes; tube response characteristics and impact forces on TSPs for a tube row are studied in detail in this report. Tube displacements associated with the instability of a TSP-inactive mode are small; however, impacts of the tube …
Date:
September 1983
Creator:
Chen, S. S.; Jendrzejczyk, J. A. & Wambsganss, M. W.
Object Type:
Report
System:
The UNT Digital Library
Separation Science and Technology Semiannual Progress Report: April - September 1992
This document reports on the work done by the Separations Science and Technology Programs of the Chemical Technology Division, Argonne National Laboratory, in the period April-September 1992. This effort is mainly concerned with developing the TRUEX process for removing and concentrating actinides from acidic waste streams contaminated with transuranic (TRU) elements.
Date:
September 1994
Creator:
Vandegrift, G. F.
Object Type:
Report
System:
The UNT Digital Library
Parallel Programming with PCN
PCN is a system for developing and executing parallel programs. It comprises a high-level programming language, a set of tools for developing and debugging programs in this language, and interfaces to Fortran and C that allow the reuse of existing code in multilingual parallel programs. Programs developed using PCN are portable across many different workstations, networks, and parallel computers. This document provides all the information required to develop parallel programs with the PCN programming system. It includes both tutorial and reference material. It also presents the basic concepts that underlie PCN, particularly where these are likely to be unfamiliar to the reader, and provides pointers to other documentation on the PCN language, programming techniques, and tools.
Date:
September 1991
Creator:
Foster, Ian & Tuecke, Steven
Object Type:
Report
System:
The UNT Digital Library
Bubble Dynamics in a Superheated Liquid
This report presents an extensive literature survey on bubble dynamics. Growth of a single spherical bubble moving in a uniformly superheated liquid is considered. Equations of motion and energy are presented in the forms that take into consideration the interaction between the motion and the growth. The fourth-order Runge-Kutta method is used to obtain a simultaneous solution of equations of motion and growth rate, and the solution is compared with available experimental results. Results for liquid sodium are presented for a range of pressures and Jakob numbers.
Date:
September 1977
Creator:
Sha, William T. & Shah, V. L.
Object Type:
Report
System:
The UNT Digital Library
Proceedings of the Focused Research Program on Spectral Theory and Boundary Value Problems, Vol. 2: Singular Differential Equations
Report on research and exchange of views among 24 mathematicians for investigations of the theory of singular Sturm-Liouville equations, the asymptotic analysis of the Titchmarsh-Weyl m(λ)-coefficient, and the qualitative theory of non-linear differential equations.
Date:
September 1988
Creator:
Kaper, H. G.; Kwong, Man Kam & Zettl, Anton
Object Type:
Report
System:
The UNT Digital Library
An Approach to Implementing State Space Searches on Heterogeneous Systems of Multiprocessors
We report on experiments run on a set of shared-memory multiprocessors. Our goal was to demonstrate that one could conveniently utilize a set of shared-memory multiprocessors cooperatively working on typical state-space searches. We utilized a technology for writing portable code for multiprocessors, coded three depth-first state-space searches, and ran them on a set of multiprocessors. The final problem used substantial resources (over 65 hours on a single processor) and was successfully distributed over four distinct shared memory multiprocessors (2 Sequents and 2 Encores), reducing the time to perform the computation to slightly over 2 hours.
Date:
September 1987
Creator:
Glickfeld, Barney & Overbeek, Ross A.
Object Type:
Report
System:
The UNT Digital Library
One-Dimensional Leakage-Flow Vibration Instabilities
Simple boundary conditions, pressure losses, and channel geometries necessary for the unstable, rigid-body translational vibrations of the wall of one-dimensional leakage-flow channel are identified. General expressions for the flow damping and stiffness forces acting on the vibrating channel wall are derived and specific results are given for channels with wall friction, point pressure losses, sharp-edged constrictions, and diverging or converging widths. The minimum conditions necessary for dynamic and static (divergence) instability were found to be an upstream point pressure loss and a diverging channel width with a finite-length throat region, respectively.
Date:
September 1987
Creator:
Mulcahy, T. M.
Object Type:
Report
System:
The UNT Digital Library
X-Ray Computed Tomography for Nondestructive Evaluation of Advanced Structural Ceramics
Report on the current status of X-ray computed tomography and the principal advantages of CT scanning.
Date:
September 1988
Creator:
Ellingson, William A. & Vannier, Michael W.
Object Type:
Report
System:
The UNT Digital Library
COMMIX-1AR/P. a Three-Dimensional Transient Single-Phase Computer Program for Thermal Hydraulic Analysis of Single and Multicomponent Systems, Volume 2: User's Guide
The COMMIX-1AR/P computer code is designed for analyzing the steady-state and transient aspects of single-phase fluid flow and heat transfer in three spatial dimensions. This version is an extension of the modeling in COMMIX-1A to include multiple fluids in physically separate regions of the computational domain, modeling descriptions for pumps, radiation heat transfer between surfaces of the solids which are embedded in or surround the fluid, a k-(epsilon) model for fluid turbulence, and improved numerical techniques. The porous-medium formulation in COMMIX allows the code to be applied to a wide range of problems involving both simple and complex geometrical arrangements. The input preparation and execution procedures are presented for the COMMIX-1AR/P program and several post processor programs which produce graphical displays of the calculated results. This document provides a step-by-step of how to use the program, including an input guide and a sample problem.
Date:
September 1992
Creator:
Garner, P. L.; Blomquist, R. N. & Gelbard, Ely M.
Object Type:
Report
System:
The UNT Digital Library
COMMIX-1AR/P. a Three-Dimensional Transient Single-Phase Computer Program for Thermal Hydraulic Analysis of Single and Multicomponent Systems, Volume 3: Programmer's Guide
The COMMIX-LAR/P computer program is designed for analyzing the steady-state and transient aspects of single-phase fluid flow and heat transfer in three spatial dimensions. This version is an extension of the modeling in COMMIX-lA to include multiple fluids in physically separate regions of the computational domain, modeling descriptions for pumps, radiation heat transfer between surfaces of the solids which are embedded in or surround the fluid, a keg model for fluid turbulence, and improved numerical techniques. The porous-medium formulation in COMMIX allows the program to be applied to a wide range of problems involving both simple and complex geometrical arrangements. The internal aspects of the COMMIX-LAR/P program are presented, covering descriptions of subprograms, variables, and files. This document provides a description of each subroutine and variable, showing linkage among these and their relation to the equations and variables presented in Volume 1.
Date:
September 1992
Creator:
Garner, P. L.; Blomquist, R. N. & Gelbard, Ely M.
Object Type:
Report
System:
The UNT Digital Library
Feasibility of MHD Submarine Propulsion
This report describes the work performed during Phase 1 and Phase 2 of the collaborative research program established between Argonne National Laboratory (ANL) and Newport News Shipbuilding and Dry Dock Company (NNS). Phase I of the program focused on the development of computer models for Magnetohydrodynamic (MHD) propulsion. Phase 2 focused on the experimental validation of the thruster performance models and the identification, through testing, of any phenomena which may impact the attractiveness of this propulsion system for shipboard applications. The report discusses in detail the work performed in Phase 2 of the program. In Phase 2, a two Tesla test facility was designed, built, and operated. The facility test loop, its components, and their design are presented. The test matrix and its rationale are discussed. Representative experimental results of the test program are presented, and are compared to computer model predictions. In general, the results of the tests and their comparison with the predictions indicate that thephenomena affecting the performance of MHD seawater thrusters are well understood and can be accurately predicted with the developed thruster computer models.
Date:
September 1992
Creator:
Doss, Ezzat D. & Sikes, W. Christopher
Object Type:
Report
System:
The UNT Digital Library
Extensible PDE Solvers Package Users Manual
This manual describes the use of the Extensible PDE Solvers package for the solution of elliptic PDEs.
Date:
September 1994
Creator:
Smith, Barry
Object Type:
Report
System:
The UNT Digital Library
European Fuel Cells R & D Review. Final Report, Purchase Order No. 062014
The aim of the Review is to present a statement on the status of fuel cell development in Europe, addressing the research, development and demonstration (RD & D) and commercialization activities being undertaken, identifying key European organizations active in development and commercialization of fuel cells and detailing their future plans. This document describes the RD & D activities in Europe on alkaline, phosphoric acid, polymer electrolyte, direct methanol, solid oxide, and molten carbonate fuel cell types. It describes the European Commission`s activities, its role in the European development of fuel cells, and its interaction with the national programs. It then presents a country-by-country breakdown. For each country, an overview is given, presented by fuel cell type. Scandinavian countries are covered in less detail. American organizations active in Europe, either in supplying fuel cell components, or in collaboration, are identified. Applications include transportation and cogeneration.
Date:
September 1994
Creator:
Michael, Philip D. & Maguire, J.
Object Type:
Report
System:
The UNT Digital Library
Magnetically Assisted Chemical Separation (MACS) Process : Preparation and Optimization of Particles for Removal of Transuranic Elements
This report describes the development of a separation process for TRU elements from various high-level waste streams.
Date:
September 1994
Creator:
Nuñez, Luis; Kaminski, M.; Bradley, C.; Buchholz, B. A.; Landsberger, S.; Aase, S. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Dynamics and Controls in Maglev Systems
The dynamic response of magnetically levitated (maglev) ground transportation systems has important consequences for safety and ride quality, guideway design, and system costs. Ride quality is determined by vehicle response and by environmental factors such as humidity and noise. The dynamic response of the vehicles is the key element in determining ride quality, and vehicle stability is an important safety-related element. To design a proper guideway that provides acceptable ride quality in the stable region, vehicle dynamics must be understood. Furthermore the trade-off between guideway smoothness and the levitation and control systems must be considered if maglev systems are to be economically feasible. The link between the guideway and the other maglev components is vehicle dynamics. For a commercial maglev system, vehicle dynamics must be analyzed and tested in detail. In this study, the role of dynamics and controls in maglev vehicle/guideway interactions is discussed, and the literature on modeling the dynamic interactions of vehicle/guideway and suspension controls for ground vehicles is reviewed. Particular emphasis is placed on modeling vehicle/guideway interactions and response characteristics of maglev systems for a multicar, multiload vehicle traveling on a single- or doublespan flexible guideway, including coupling effects of vehicle/guideway, comparison of concentrated and distributed …
Date:
September 1992
Creator:
Cai, Y.; Chen, Shoei-Sheng & Rote, D. M.
Object Type:
Report
System:
The UNT Digital Library
Domain and Surface Structures of Sodium Tungsten Bronzes, NaxWO₃ (0.4 [x [1)
The domain and surface structures of metallic sodium tungsten bronzes, NaxWO₃, 0.4 < x < 1, were studied using optical microscopy, supplemented by chemical methods, photoelectron spectroscopy, electron microscopy, etc. The birefringent, multidomain structure of the bronze is exhibited by a sodium-deficient, epitaxial surface film and hence is not, as reported elsewhere, a bulk property. The film can be synthesized by anodic electrolysis in alkaline solution and can exist only epitaxially with the substrate. It is chemically inert, translucent, and often laminated to a multilayered film. The film domain is hypersensitive to lateral stress and to thermal change, and appears to be modulated by minute structural changes of the substrate. This epitaxial modulation of the film is strikingly large at the phase transitions of the substrate induced by slightly different tiltings of the oxygen octahedra. The domain-wall movement is often slow enough to be visible, and that by thermal effect is occasionally accompanied by an audible, high-pitched, snapping sound.
Date:
September 1978
Creator:
Atoji, Masao
Object Type:
Report
System:
The UNT Digital Library
Tritium and Hydrogen Transport in LMFBR Systems: EBR-II, CRBR, and FFTF
A tritium and hydrogen transport model has been employed to simulate concentration profiles, tritium losses to auxiliary containment systems, and cold trap burdens for EBR-II, CRBR, and FFTF. Experimental data from EBR-II were found to correlate well with calculated tritium and hydrogen profiles. A major change relative to previous transport models, namely, the inhibiting effect of oxide coatings on tritium permeation through reactor structural surfaces, has been incorporated into the current model. Tritium release rates to auxiliary systems where oxide barrier effects were included were predicted to be approximately two orders of magnitude lower than those for the reference case where structural surfaces were assumed to be totally oxide-free. Tritium releases during operation of large LMFBRs are expected to present essentially no hazard to the environment.
Date:
September 1978
Creator:
Renner, T. A. & McPheeters, C. C.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Considerations on Developing IAEA Technical Safeguards for LMFBR Power Systems
Nuclear fuel cycles safeguards should be considered in the dynamic context of a world deployment of various reactor types and varying availability of fuel-cycle services. There will be a close interaction between thermal-reactor cycles and the future deployment of fast breeders. The quantities of plutonium and the reprocessing, conversion, fabrication, and storage methods of the fuel for the fast breeders will have a significant impact on safeguards techniques. The approach to the fast breeder fuel cycle safeguards follows the general safeguards system approach proposed by the IAEA. Objective of IAEA safeguards is the detection of diversion of nuclear material and deterrence of such diversion. To achieve independent verification of material balance accountancy requires the capability to monitor inventory status and verify material flows and quantities of all nuclear materials subject to safeguards. Containment and surveillance measures are applied to monitor key measurement points, maintain integrity of material balance, and complement material accountancy. The safeguards study attempts to develop a generic reference IAEA Safeguards System and explores various system options using containment/surveillance and material accountancy instrumentation and integrated systems designs.
Date:
September 1980
Creator:
Persiani, P. J.; Holmes, J. P.; Todd, J. L.; de Montmollin, J. M.; Higinbotham, W. A.; Weinstock, E. W. et al.
Object Type:
Report
System:
The UNT Digital Library
The Measurement of Leaching from Simulated Nuclear-Waste Glass Using Radiotracers
The use of radiotracer spiking as a method of measuring the leaching from simulated nuclear-waste glass is shown to give results comparable with other analytical detection methods. The leaching behavior of strontium-85, ruthenium-106, barium-133, cesium-137, cerium-141, europium-152, and other isotopes is measured for several defense waste glasses. These tests show that radiotracer spiking is a sensitive, multi-element technique that can provide leaching data, for actual waste elements, that are difficult to obtain by other methods. Additionally, a detailed procedure is described that allows spiked glass to be prepared with a suitable distribution of radionuclides.
Date:
September 1982
Creator:
Bates, J. K.; Jardine, L. J. & Steindler, M. J.
Object Type:
Report
System:
The UNT Digital Library
A Study of the Uranium-Aluminum-Silicon System
The U-Al-Si system was investigated in the composition range from U to U-80 at.% Al to U-75 at.% Si. More than 260 binary and ternary alloys were arc melted and studied by metallographic and x-ray powder diffraction techniques, in the as-cast condition and after thermal treatment at temperatures ranging from 700 to 1040 C. One or possibly two ternary compounds of undetermined crystal structure exist at or near U2AlSi2 The binary silicides U3Si, U3Si2, and USi can dissolve only small amounts of Al in solid solution, but the higher silicides U3Si5, USi2-x, and USi/sub 3/ dissolve increasingly larger amounts of Al. Of the three binary aluminides, UAl2 can dissolve more than 12 at.% Si in solid solution. UAl3 forms a continuous solid solution with USi3, and UAl4 is not present in alloys containing more than 3 at.% Si.
Date:
September 1982
Creator:
Dwight, A. E.
Object Type:
Report
System:
The UNT Digital Library
Light-Water-Reactor Fission-Product Data Assessment
This assessment seeks (1) to determine the most probable chemical compounds formed between fission products and actinides in urania fuels under normal and accident conditions and (2) to identify gaps in knowledge of these fission-product compounds. The ultimate goal of this effort is to develop predictive capability about the behavior of fission products under normal and accident conditions. The relevant thermochemical data have been organized by compound type, the chemical stability of resultant compounds determined, and data uncertainty evaluated. The assessment focused on fission-product and actinide oxides, halides, tellurides, and hydroxides. Free energy equations are given for those compounds for which data were available.
Date:
September 1982
Creator:
Blackburn, P. E. & Johnson, C. E.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Ceramic Refractories for Slagging Gasifiers : Summary of Progress to Date
Commercial refractories were tested for up to 500 h in both basic and acidic slags. The slag compositions typify those expected in slagging coal gasifiers. The slag temperatures ranged up to 1600 degrees C. Compositions tested have included silicon carbides, chrome-alumina-magnesia spinels, and alumina and magnesia-based refractories with various amounts of chromia and silica. In some tests, the cold faces were water cooled. With water cooling, the silicon carbides showed virtually no attack after 500 h. In the absence of water cooling, the chrome-alumina-magnesia spinels were the most resistant to slag attack but were subject to thermal-shock cracking. Alumina-chrome refractories performed well in acid slags when water cooled, are probably more stable than silicon carbide in coal-gasification atmospheres, and, in the form of ramming mixes, showed excellent thermal-shock resistances. Plans for future testing are described.
Date:
September 1978
Creator:
Kennedy, C. R.; Swaroop, R.; Jones, D. J.; Fousek, R. J.; Poeppel, R. B. & Stahl, D.
Object Type:
Report
System:
The UNT Digital Library
Ice Production and Storage for Seasonal Applications Utilizing Heat Pipe Technology
This report presents the results of the analytical and experimental work of the application of heat pipes to the production of winter ice for seasonal cooling applications. This program consisted of two major subtasks. The first subtask was to develop theoretical models of heat-pipe and system performance. The second subtask was to perform laboratory experiments on full-scale units to measure performance as functions of ambient conditions, and to make design variations in response to experimental observations. The results of these efforts are presented and recommendations made as to future research efforts.
Date:
September 1982
Creator:
Gorski, A. J.; Schertz, William W.; Wantroba, A. S.; McGarity, Arthur E. & Buyco, E. H.
Object Type:
Report
System:
The UNT Digital Library
A Solar District-Heating System Using Seasonal Storage for the Charlestown, Boston Navy Yard Redevelopment Project
A preliminary analysis is presented for a seasonal storage solar heating system for the Charlestown Navy Yard in Boston, Massachusetts. The area occupies a prominent location in the Boston Harbor and is being redeveloped for residential and commercial use. The system makes use of two large, buried concrete storage tanks totaling 5700 cubic meters as a water heat store. Other storage facilities, including a dry dock, offer additional solar opportunities for the navy Yard as the redevelopment progresses. The analysis makes extensive use of MINSUN, a computer performance and economic simulation routine written specifically for solar seasonal storage systems. The system performance and economics are analyzed for different collector types and areas, component costs, exogenous economic conditions, and optional inclusion of a heat pump. System cost-effectiveness is defined in relation to an economic break-even situation with respect to a conventional system, and is presented in terms of a solar premium, which is the incremental cost for the solar system per MWH of conventional fuel displaced. The additional analysis and design considerations necessary before an implementation phase are outlined. System implementation is discussed in terms of the roles of the various parties involved and funding/financing possibilities.
Date:
September 1982
Creator:
Breger, Dwayne
Object Type:
Report
System:
The UNT Digital Library