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1,145 Matching Results
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TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps
The TFTR vacuum vessel will have a system of four 61 cm diameter mercury diffusion pumps to provide a base pressure in the 10/sup -8/ to 10/sup -9/ Torr range as well as a low impurity level within the vessel. The system, called the Torus Vacuum Pumping System (TVPS), will be employed with the aid of an occasional 250/sup 0/C bakeout in situ as well as periodic applications of aggressive discharge cleaning. The TVPS is an ultrahigh-vacuum (UHV) system using no elastomers as well as being a closed system with respect to tritium or any tritiated gases. The backing system employing approximately 75 all-metal isolation valves is designed with the features of redundancy and flexibility employed in a variety of ways to meet the fundamental requirements and functions enumerated for the TVPS. Since the design, is one which is a modification of the conceptual design of the TVPS, those features which have changed are discussed. Calculations are presented for the major performance parameters anticipated for the TVPS and include conductances, effective pumping speeds, base pressures, operating parameters, getter pump parameters, and calculations of time constants associated with leak checking. Modifications in the vacuum pumping system for the guard regions on …
Date:
June 1, 1976
Creator:
Sink, D. A. & Sniderman, M.
Object Type:
Report
System:
The UNT Digital Library
Acoustic emission from beryllium
The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensile behavior was qualitatively similar for all the materials tested. Burst rate maxima centered roughly at 0.1 percent and 1.0 percent plastic strain were observed. The magnitude but not the strain at the low strain burst rate peak was very sensitive to prior thermal treatment, while the higher strain burst rate peak was insensitive to prior heat treatment. An energy per burst maximum was observed at 0.2 percent plastic strain, the magnitude of which was moderately sensitive to heat treatment. The Kaiser effect is observed in the material studied. Emission during compression was similar to that observed in tension. The acoustic emission observed is attributed to dislocation motion, as proposed by James and Carpenter for LiF, NaCl, and Zn. Metallographic studies …
Date:
June 9, 1976
Creator:
Heiple, C. R. & Adams, R. O.
Object Type:
Report
System:
The UNT Digital Library
Regional transport model of atmospheric sulfates
A regional transport model of atmospheric sulfates was developed. This quasi-Lagrangian three-dimensional grid numerical model uses a detailed SO/sub 2/ emission inventory of major anthropogenic sources in the eastern U.S. region and observed meteorological data during an episode as inputs. The model accounts for advective transport and turbulent diffusion of the pollutants. The chemical transformation of SO/sub 2/ and SO/sub 4//sup 2 -/ and the deposition of the species at the earth's surface are assumed to be linear processes at specified constant rates. The numerical model can predict the daily average concentrations of SO/sub 2/ and SO/sub 4//sup 2 -/ at all receptor locations in the grid region during the episode. Because of the spatial resolution of the grid, this model is particularly suited to investigate the effect of tall stacks in reducing the ambient concentration levels of sulfur pollutants. The formulations and assumptions of the regional sulfate transport model are presented. The model inputs and results are discussed. Isopleths of predicted SO/sub 2/ and SO/sub 4//sup 2 -/ concentrations are compared with the observed ground level values.
Date:
June 1, 1976
Creator:
Rao, K.S.; Thomson, I. & Egan, B.A.
Object Type:
Article
System:
The UNT Digital Library
Relative determination of W-values for alpha particles in tissue equivalent and other gases. [5. 4 MeV alpha particles]
W (the average energy to form an ion pair) for 5.4 MeV /sup 241/Am alpha particles in a Rossi-type tissue equivalent (T.E.) gas, argon and methane was determined to an accuracy better than 0.2% using a new automated data handling system. A vibrating reed electrometer and current digitizer were used to measure the current produced by completely stopping the alpha particles in a large cylindrical ionization chamber. A multichannel analyzer, operating in a slow multiscalar mode, was used to store pulses from the current digitizer. The dwell time, on the order of 60 minutes per channel, was selected with an external timer gate. Current measurements were made at reduced pressures (approximately 200 torr) to reduce ion-recombination. The average current, over many repeated measurements, was compared to the current produced in nitrogen and its previously published W-value of 36.39 +- 0.04 eV/ion pair. The resulting W-values were (in eV/ion pair): 26.29 +- 0.05 for argon, 29.08 +- 0.03 for methane and 30.72 +- 0.04 for T.E. gas, which had an analyzed composition of 64.6% methane, 32.4% CO/sub 2/, and 2.7% nitrogen. Although the methane and argon values agree within 0.1% with previously published values, the value for T.E. is 1.2% lower …
Date:
June 1, 1976
Creator:
Krieger, G L
Object Type:
Report
System:
The UNT Digital Library
Finite-Element Analysis of a Thick-Wall Tube Containing a Crater-Like Surface Flaw
A three-dimensional finite-element elastic analysis is carried out for a thick-wall tube (as sued in typical LMFBR steam generators) that contains a surface flaw in the form of a paraboloid of revolution. Effects of the depth and aspect ratio of the flaw on the stress distribution and stress concentration in the tube are explored.
Date:
June 1976
Creator:
Majumdar, S.
Object Type:
Report
System:
The UNT Digital Library
Photoexcitation in Superconductors
Dissertation discussing the results of experiments to study the behavior of superconductors under light illumination.
Date:
June 1976
Creator:
Schuller, Ivan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Noise Pollution from Expressways
This paper provides an economic analysis of three noise abatement strategies designed to interrupt the path of noise between highways and residential areas, and makes some abatement policy suggestions.
Date:
June 1976
Creator:
Vaughan, Roger J. & Huckins, Larry
Object Type:
Report
System:
The UNT Digital Library
Investigation of Reactivity Anomalies in EBR-II
A data-collection and advisory team was formed to investigate observations of power reactivity decrement (PRD) and reactivity loss rate (RLR) obtained during EBR-II reactor run 74, because both the PRD and RLR were judged to be high during that run. This report describes the efforts to develop a realistic model explaining the reactivity observations for run 74 and presents recommendations for additional diagnostic information in the event of a recurrence of off-normal behavior of reactivity.
Date:
June 1976
Creator:
Walters, L. C.; Cutforth, D. C.; Forehand, H. M.; Hudman, G. D.; Larson, H. A.; MacFarlane, H. F. et al.
Object Type:
Report
System:
The UNT Digital Library
Reactivity and Power Shape Control : Theory and Numerical Applications
An optimization method, based on linear programming, has been developed which determines the enrichment distribution in a multizone reactor such that the desired power distribution is achieved at BOL, as well as the poison distribution during reactor operation such that the reactor is kept critical and the desired power distribution is retained. For the numerical implementation of the method, the CYPRUS code has been written. Results of the application of the method are presented and input specifications for the use of the code are described.
Date:
June 1976
Creator:
Tzanos, Constantine P.
Object Type:
Report
System:
The UNT Digital Library
A Summary on Experimental Methods for Statistical Transient Analysis of Two-Phase Gas-Liquid Flow
Much work has been done in the study of two-phase gas-liquid flows. Although it has been recognized superficially that such flows are not homogeneous in general, little attention has been paid to the inherent discreteness of the two-phase systems. Only relatively recently have fluctuating characteristics of two-phase flows been studied in detail. As a result, new experimental devices and techniques have been developed for use in measuring quantities previously ignored. This report reviews and summarizes most of these methods in an effort to emphasize the importance of the fluctuating nature of these flows and as a guide to further research in this field.
Date:
June 1976
Creator:
Delhaye, Jean-Marc & Jones, Owen C., Jr.
Object Type:
Report
System:
The UNT Digital Library
Fuel Dynamics Loss-of-Flow Test L3 : Final Report
The behavior of FTR-type, mixed-oxide, pre-irradiated, ''intermediate-power-structure'' fuel during a simulation of an FTR loss-of-flow accident was studied in the Mark-IIA integral TREAT loop. Analysis of the data reported here leads to a postulated scenario (sequence and timing) of events in the test. This scenario is presented, together with the calculated timing of events obtained by use of the SAS code.
Date:
June 1976
Creator:
Fischer, A. K.; Lo, R. K. & Barts, E. W.
Object Type:
Report
System:
The UNT Digital Library
Theory of Ionization by Electron Collisions
The problem of calculating comprehensive sets of cross sections for ionization of atoms and molecules is reviewed. Emphasis is put on targets that are already ionized and lower-energy collisions for which the incident electron must be treated on a par with target electrons. The physical circumstances are discussed in which perturbation methods should be adequate, and special investigations are recommended to identify the relevant ranges of parameters more precisely and dependably. A new R-matrix approach is outlined which should permit rather simple, approximate, but dependable calculations when the perturbation methods fail.
Date:
June 1976
Creator:
Fano, Ugo & Inokuti, Mitio
Object Type:
Report
System:
The UNT Digital Library
Issues in the future supply of electricity to the Northeast. [1985 and 2000]
This assessment of the problems of the electric sector is part of the BNL study on the Energy Future of the Northeast. Topics covered by the issue papers include the potential supply of energy to the Northeast from coal, oil, natural gas, liquefied natural gas, nuclear power, municipal waste, solar energy, and wind power, and the demand for energy in the Northeast from the industrial, transportation, and residential and commercial sectors. This paper compares energy demand projections derived in other parts of the Northeast Energy Perspectives Study to current utility projections; discusses major technical issues in capacity forecasting, including system load factors, outage rates, scale economies, unit sizes, and generation mix planning; discusses major siting constraints faced by each type of generation in the Northeast; and prepares preliminary forecasts of the number and type of new generation facilities necessary by 1985 and 2000, and an analysis of the implications for regional siting policy. (MCW)
Date:
June 1, 1976
Creator:
Meier, P. M.; McCoy, T. H. & Rahman, S.
Object Type:
Report
System:
The UNT Digital Library
High-burnup performance of mixed-oxide fuel rods clad in type 316SS of 0. 010- and 0. 015-inch wall thickness. [LMFBR]
Two short mixed-oxide fuel rods of LMFBR design configuration were irradiated to a burnup of approx. 12.5 atom % in GETR. Profilometry at several intervals during the test indicated that the rod with a 0.010 inch thick cladding exhibited a diametral strain of 0.17% per atom % burnup, while the rod with a 0.015 inch thick cladding exhibited a lower diametral strain rate of 0.12% per atom % burnup. These data present the opportunity for analytical methods to evaluate fuel rod dimensional changes without the complicating effect of metal swelling. Also, the rods incorporated a large plenum space so that pressure from released fission gases was extremely low. These measured strain rates are consistent with the range of fuel diametral strain rates that are associated with solid fission product swelling.
Date:
June 1, 1976
Creator:
Wadekamper, D. C.; Plumlee, D. E. & Hilbert, R. F.
Object Type:
Report
System:
The UNT Digital Library
Proposal - Geothermal Power Plant Nicaragua
None
Date:
June 1, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 68, No. 26, Ed. 1 Thursday, June 24, 1976
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
June 24, 1976
Creator:
Baggarly, H. M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 68, No. 24, Ed. 1 Thursday, June 10, 1976
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
June 10, 1976
Creator:
Baggarly, H. M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 68, No. 23, Ed. 1 Thursday, June 3, 1976
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
June 3, 1976
Creator:
Baggarly, H. M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 68, No. 25, Ed. 1 Thursday, June 17, 1976
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
June 17, 1976
Creator:
Baggarly, H. M.
Object Type:
Newspaper
System:
The Portal to Texas History
Geothermal loop experimental facility. Quarterly project report, April 1, 1976-June 30, 1976
Operations with the Geothermal Loop Experimental Facility are reviewed. Inspection of the separators, scrubbers, pumps, valves, and controls is described. (MHR)
Date:
June 28, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Clarksville Times (Clarksville, Tex.), Vol. 104, No. 22, Ed. 1 Thursday, June 17, 1976
Weekly newspaper from Clarksville, Texas that includes local, state, and national news along with advertising.
Date:
June 17, 1976
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Clarksville Times (Clarksville, Tex.), Vol. 104, No. 23, Ed. 1 Thursday, June 24, 1976
Weekly newspaper from Clarksville, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 1976
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Clarksville Times (Clarksville, Tex.), Vol. 104, No. 20, Ed. 1 Thursday, June 3, 1976
Weekly newspaper from Clarksville, Texas that includes local, state, and national news along with advertising.
Date:
June 3, 1976
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Clarksville Times (Clarksville, Tex.), Vol. 104, No. 21, Ed. 1 Thursday, June 10, 1976
Weekly newspaper from Clarksville, Texas that includes local, state, and national news along with advertising.
Date:
June 10, 1976
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History