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24,765 Matching Results
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Neutronics of a mixed-flow gas-core reactor
The study was made to investigate the neutronic feasibility of a mixed-flow gas-core reactor. Three reactor concepts were studied: four- and seven-cell radial reactors and a seven-cell scallop reactor. The reactors were fueled with UF/sub 6/ (either U-233 or U-235) and various parameters were varied. A four-cell reactor is not practical nor is the U-235 fueled seven-cell radial reactor; however, the 7-cell U-233 radial and scallop reactors can satisfy all design criteria. The mixed flow gas core reactor is a very attractive reactor concept and warrants further investigation.
Date:
November 1, 1977
Creator:
Soran, P. D. & Hansen, G. E.
Object Type:
Report
System:
The UNT Digital Library
Motion of a Loosely Fitting Piston in a Closed End Cylinder Containing a Perfect Gas
The equations of motion are derived for a piston in a closed end cylinder containing a compressible perfect gas. These equations include the possibility of an arbitrary motion imposed on the cylinder. In the analysis, it is assumed that there is a clearance between the piston and the cylinder which is sufficiently small so that the flow in the gap is controlled by viscous forces.
Date:
November 1, 1975
Creator:
Stone, G. W.; Reis, G. E. & Kaestner, P. C.
Object Type:
Report
System:
The UNT Digital Library
Outdoor sources of indoor air pollution
Conservation measures that seal a building, like storm window installation, can significantly reduce its energy requirements. These measures also protect its occupants from air pollutants having outdoor sources but amplify any harmful effects of those generated indoors. Using these Fourier series techniques and an approximation of outdoor pollution peaks by step functions, we obtained the following results: the average daily concentration indoors is the same as outdoors for any pollutant with no indoor sinks if inside and outside air are assumed uniform (that is, well mixed). However, lowering a building's air exchange rate 4-fold will still protect its occupants from outdoor pollution sources, but only if the outdoor peak or variation above its average is much greater than its average, and the peak is short-lived.
Date:
November 1, 1977
Creator:
Silberstein, S.
Object Type:
Report
System:
The UNT Digital Library
Estimate of earth media shear strength at the Nevada Test Site
A method is presented of estimating the effective shear strength of the fractured rock that surrounds a nuclear detonation. To do this, we measure the cavity radii from previous detonations. We also use numerical computer codes to model the explosion phenomenology and develop the functional relationship between the normalized cavity displacement and the normalized shear strength of the rock. In this sense, the computer codes serve as replica models that are dimensionally analyzed to interpret the field experience. We separate the effects of gravity and overburden pressure from the effects of the material properties and give scaling laws for each. We have analyzed approximately 300 nuclear detonations at the Nevada Test Site (NTS) and have found that the most frequent shear strengths are between 0.020 and 0.060 kbars. They are also essentially independent of the depth-of-burial ranges considered. We obtained good agreement between predicted shear strengths and those measured from core samples for different areas at the Nevada Test Site.
Date:
November 3, 1977
Creator:
Terhune, R. W. & Glenn, H. D.
Object Type:
Report
System:
The UNT Digital Library
Transport-diffusion comparisons for small core LMFBR disruptive accidents
A number of numerical experiments were performed to assess the validity of diffusion theory for calculating the reactivity state of various small core LMFBR disrupted geometries. The disrupted configurations correspond, in general, to various configurations predicted by SAS3A for transient undercooling (TUC) and transient overpower (TOP) accidents for homogeneous cores and to the ZPPR-7 configurations for heterogeneous core. In all TUC cases diffusion theory was shown to be inadequate for the calculation of reactivity changes during core disassembly.
Date:
November 1, 1977
Creator:
Tomlinson, E.T.
Object Type:
Report
System:
The UNT Digital Library
Simple scaling model for exploding pusher targets
A simple model has been developed which when normalized by experiment or Lasnex calculations can be used to scale neutron yields for variations in laser input power and pulse length and target radius and wall thickness. The model also illucidates some of the physical processes occurring in this regime of laser fusion experiments. Within certain limitations on incident intensity and target geometry, the model scales with experiments and calculations to within a factor of two over six decades in neutron yield.
Date:
November 4, 1977
Creator:
Storm, E. K.; Larsen, J. T.; Nuckolls, J. H.; Ahlstrom, H. G. & Manes, K. R.
Object Type:
Article
System:
The UNT Digital Library
Annotated bibliography: hazard assessments for the geologic isolation of nuclear wastes. Final report. Center for Resource and Environmental Systems Studies report No. 41
This report presents an annotated bibliography of risk assessments that are pertinent to constructing, operating, and decommissioning a federal repository for the underground storage of radioactive waste. This might be considered as a first phase in an assessment of the risks associated with radioactive waste storage. Only those documents judged to be the more pertinent are abstracted. The abstracts are grouped under 13 classifications. A subject and author index is provided.
Date:
November 1, 1977
Creator:
Suta, B.E.; Mara, S.J.; Radding, S.B. & Weisbecker, L.W.
Object Type:
Report
System:
The UNT Digital Library
Self-consistent model calculations of the ordered S-matrix and the cylinder correction
The multiperipheral ordered bootstrap of Rosenzweig and Veneziano is studied by using dual triple Regge couplings exhibiting the required threshold behavior. In the interval -0.5 less than or equal to t less than or equal to 0.8 GeV/sup 2/ self-consistent reggeon couplings and propagators are obtained for values of Regge slopes and intercepts consistent with the physical values for the leading natural-parity Regge trajectories. Cylinder effects on planar pole positions and couplings are calculated. By use of an unsymmetrical planar ..pi..--rho reggeon loop model, self-consistent solutions are obtained for the unnatural-parity mesons in the interval -0.5 less than or equal to t less than or equal to 0.6 GeV/sup 2/. The effects of other Regge poles being neglected, the model gives a value of the ..pi..--eta splitting consistent with experiment. 24 figures, 1 table, 25 references.
Date:
November 1, 1977
Creator:
Millan, J.
Object Type:
Report
System:
The UNT Digital Library
Weak interaction effects in e/sup +/e/sup -/ annihilation with polarised beams
Although the standard gauge model of weak and electromagnetic interactions based on the work of Salam and Weinberg has met with great success, there are experimental facts that will require its extension or its modification to a new gauge model; the discovery of a heavy lepton at SLAC and the absence of parity violation in atoms that is expected from the neutral weak current coupling to electrons are discussed. Three tests are proposed that bear on these questions. First, heavy lepton production in e/sup +/e/sup -/ annihilation when one of the incident beams is longitudinally polarized is considered and the purely leptonic decay of this heavy lepton is examined. An asymmetry in the inclusive angular distribution of one charged lepton (electron or muon) is important in determining the structure of weak interactions of the heavy lepton. In fact, this angular asymmetry easily distinguishes between the cases V - A and V + A for the heavy lepton current. Then, the decay channel L ..-->.. ..nu../sub L/ + one hadron is considered (L = heavy lepton) under the same experimental set-up and the inclusive one-hadron angular distribution examined. Parity nonconservation in the decay of the heavy lepton causes a conspicuous forward-backward …
Date:
November 2, 1977
Creator:
Simard, R.
Object Type:
Report
System:
The UNT Digital Library
Distributed energy systems: a review of related technologies
Twenty-three papers were presented at the meeting. A separate abstract was prepared for each paper. (LCL)
Date:
November 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of a three-dimensional model of the atmospheric boundary layer using the finite element method
This report summarizes our current effort and ideas toward the development of a model for the planetary boundary layer using the finite element technique. As an initial step, the finite element methodology is applied to simpler version of the boundary layer equations given by the two-dimensional, constant-property, incompressible conservation equations (Navier-Stokes equations). Solution procedures for both the steady-state and transient equations are discussed. For the transient problem, a variable time-step, trapezoid-rule algorithm with dynamic time-truncation error control is presented. The resulting system of nonlinear algebraic equations is solved by a Newton iteration procedure with a frontal solution scheme used for the linear set of equations. The need to develop a suitable linear equation solver, with respect to minimization of computer storage and execution costs, particularly for large (three-dimensional) finite element problems, is also discussed.
Date:
November 22, 1977
Creator:
Lee, R. L. & Gresho, P. M.
Object Type:
Report
System:
The UNT Digital Library
Examination of fast reactor fuels, FBR analytical quality assurance standards and methods, and analytical methods development: Irradiation tests. Progress report, July 1--September 30, 1977. [PuO/sub 2/; UO/sub 2/]
Information is presented concerning the examination of fast reactor fuels, FBR analytical quality assurance standards, and analytical methods development irradiation tests.
Date:
November 1, 1977
Creator:
Baker, R.D. (comp.)
Object Type:
Report
System:
The UNT Digital Library
Hand deburring of precision miniature parts
None
Date:
November 1, 1975
Creator:
Gillespie, LaRoux K.
Object Type:
Report
System:
The UNT Digital Library
Numerical methods for laser fusion
The LASNEX computer code was developed to study the many interrelated physical processes important in the effort to achieve laser initiated fusion. It has been used to calculate the results of numerous laser plasma experiments and to design targets and determine desirable laser pulse characteristics for future experiments. Some processes, such as hydrodynamics, are well formulated in fundamental equations and can be solved with high accuracy by sophisticated numerical methods. Other processes, such as laser absorption and electron transport, are less well understood and do not, in general, warrant the use of highly accurate techniques. Numerical models were chosen that adequately represent each physical process, keeping in mind its inherent uncertainties, the importance of the process to the overall calculation, and its effect on the determination of experimental observables.
Date:
November 3, 1977
Creator:
Zimmerman, G.B.
Object Type:
Article
System:
The UNT Digital Library
Data report of a pretest analysis of soil-structure interaction and structural response in low-amplitude explosive testing (50 KG) of the heissdampfreaktor (HDR)
This report describes a three-dimensional nonlinear TRANAL finite element analysis of a nuclear reactor subjected to ground shaking from a buried 50 kg explosive source. The analysis is a pretest simulation of a test event which was scheduled to be conducted in West Germany on 3 November 1979.
Date:
November 29, 1979
Creator:
Vaughan, D.K.; Sandler, I.; Rubin, D.; Isenberg, J. & Nikooyeh, H.
Object Type:
Report
System:
The UNT Digital Library
Remote Working Level Monitor. Final report
The Remote Working Level Monitor (RWLM) is an instrument used to remotely monitor the RN-daughter concentrations and the Working Level (WL). It is an ac powered, microprocessor based instrument which multiplexes two independent detector units to a single central processor unit (CPU). The CPU controls the actuation of the detector units and processes and outputs the data received from these remote detector units. The remote detector units are fully automated and require no manual operation once they are set up. They detect and separate the alpha emitters of RaA and RaC' as well as detecting the beta emitters of RaB and RaC. The resultant pulses from these detected radioisotopes are transmitted to the CPU for processing. The programmed microprocessor performs the mathematical manipulations necessary to output accurate Rn-daughter concentrations and the WL. A special subroutine within the program enables the RWLM to run and output a calibration procedure on command. The data resulting from this request can then be processed in a separate program on most computers capable of BASIC programming. The calibration program results in the derivation of coefficients and beta efficiencies which provides calibrated coefficients and beta efficiencies.
Date:
November 18, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Estimates of post-acceleration longitudinal bunch compression
A simple analytic method is developed, based on physical approximations, for treating transient implosive longitudinal compression of bunches of heavy ions in an accelerator system for ignition of inertial-confinement fusion pellet targets. Parametric dependences of attainable compressions and of beam path lengths and times during compression are indicated for ramped pulsed-gap lines, rf systems in storage and accumulator rings, and composite systems, including sections of free drift. It appears that for high-confidence pellets in a plant producing 1000 MW of electric power the needed pulse lengths cannot be obtained with rings alone unless an unreasonably large number of them are used, independent of choice of rf harmonic number. In contrast, pulsed-gap lines alone can meet this need. The effects of an initial inward compressive drift and of longitudinal emittance are included.
Date:
November 25, 1977
Creator:
Judd, D.L.
Object Type:
Article
System:
The UNT Digital Library
Study of brine treatment. Final report
Available information pertinent to the treatment of geothermal brines was collected by literature search and then evaluated and summarized for use by the electric utility and geothermal industries. The information was screened from the geothermal, oil and gas, wastewater disposal, and boiler water treatment industries. The current state of knowledge and methodology concerning the treatment of geothermal brines to control scaling and corrosion in geothermal electric power production was assessed. Currently, geothermal scale in pipes and wells is removed by physical or chemical methods. There is a growing effort on developing methods to control scale formation for both fresh and spent brines, including pH adjustment and application of an electrical potential for fresh fluids, and coagulation to treat spent fluids. Current methods of corrosion control center around planned replacement of piping and other plant components, with efforts focused primarily on development of materials with improved corrosion resistance. Recommendations for additional work to improve brine treatment include the following: (1) chemical and physical characterization of brine and scale compositions, (2) basic data on the mechanism of scale formation and the effects of inhibitors, (3) development of instrumentation to monitor geothermal brine constituents, (4) correlation of laboratory results with field test data, …
Date:
November 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Assessment of nuclear power plant siting methods
Several different methods have been developed for selecting sites for nuclear power plants. This report summarizes the basic assumptions and formal requirements of each method and evaluates conditions under which each is correctly applied to power plant siting problems. It also describes conditions under which different siting methods can produce different results. Included are criteria for evaluating the skill with which site-selection methods have been applied.
Date:
November 1, 1979
Creator:
Rowe, M. D.; Hobbs, B. F.; Pierce, B. L. & Meier, P. M.
Object Type:
Report
System:
The UNT Digital Library
Heavy ion reactions in the transition region
Evidence is given for a serious and systematic failure of the DWBA to predict the cross sections for single nucleon transfers induced by heavy ions above about 10 MeV/Nucleon beam energies. This is perhaps related to a coherent coupling to an increasing cross section to the quasi-elastic continuum, which also shows an anomalous energy dependence at about the same energy.
Date:
November 1, 1977
Creator:
Hendrie, D. L.
Object Type:
Article
System:
The UNT Digital Library
Letter report for the Superconducting Magnet Development Program, April 1, 1977--June 30, 1977
The results and accomplishments of the Superconducting Magnet Development Program (SCMDP) for the second quarter of the calendar year 1977 are summarized. The presentations are arranged according to projects rather than the group organization by discipline of the Magnetics and Superconductivity Section. The design, procurement, and fabrication of the Large Coil Segment are well under way. Significant progress is reported on the conductor stability and loss experiments for both toroidal field coils and poloidal field coils.
Date:
November 1, 1977
Creator:
Fietz, W. A. & Lubell, M. S.
Object Type:
Report
System:
The UNT Digital Library
Engineering problems of future neutral beam injectors
Because there is no limit to the energy or power that can be delivered by a neutral-beam injector, its use will be restricted by either its cost, size, or reliability. Studies show that these factors can be improved by the injector design, and several examples, taken from mirror reactor studies, are given.
Date:
November 23, 1977
Creator:
Fink, J.
Object Type:
Article
System:
The UNT Digital Library
Limits to Ductility Set by Plastic Flow Localization
The theory of strain localization is reviewed with reference both to local necking in sheet metal forming processes and to more general three dimensional shear band localizations that sometimes mark the onset of ductile rupture. Both bifurcation behavior and the growth of initial imperfections are considered. In addition to analyses based on classical Mises-like constitutive laws, approaches to localization based on constitutive models that may more accurately model processes of slip and progressive rupturing on the microscale in structural alloys are discussed. Among these non-classical constitutive features are the destabilizing roles of yield surface vertices and of non-normality effects, arising, for example, from slight pressure sensitivity of yield. Analyses based on a constitutive model of a progressively cavitating dilational plastic material which is intended to model the process of ductile void growth in metals are also discussed. A variety of numerical results are presented. In the context of the three dimensional theory of localization, it is shown that a simple vertex model predicts ratios of ductility in plane strain tension to ductility in axisymmetric tension qualitatively consistent with experiment, and the destabilizing influence of a hydrostatic stress dependent void nucleation criterion is illustrated. In the sheet necking context, and focussing …
Date:
November 1, 1977
Creator:
Needleman, A. & Rice, J. R.
Object Type:
Article
System:
The UNT Digital Library
Auger study of surface carbon and oxygen on thorium following ion bombardment
The composition of a thorium metal surface has been monitored using Auger electron spectroscopy following Ar/sup +/ bombardment at different temperatures. After extended Ar/sup +/ bombardment, enough contaminated overlayers were removed to expose a surface region containing only thorium, bulk impurities, and imbedded argon. The main impurities, carbon and oxygen, differed in their behavior when the sample was annealed following bombardment. The amount of surface carbon either increased or remained constant during annealing depending upon the temperature of the sample during bombardment. The amount of surface oxygen decreased rapidly when the sample was heated above 500/sup 0/C regardless of the sample temperature during bombardment. These experiments indicate that preparation of clean, annealed thorium surfaces requires ion bombardment at temperatures > or = 400/sup 0/C.
Date:
November 17, 1977
Creator:
Bastasz, R. & Colmenares, C.
Object Type:
Article
System:
The UNT Digital Library