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Acoustic Emission Weld Monitoring of Nuclear Components

Description: Acoustic emission monitoring augments other nondestructive testing methods and is sometimes applicable when other tests cannot be applied. This is, in part, due to the high sensitivity of acoustic emission monitoring. Acoustic emission monitoring is only sensitive to active flaw-growth, however, and will not detect a flaw in equilibrium. This paper describes the application of acoustic emission monitoring to nuclear reactor fuel pin end closure welds and other weldments of the reactor piping.
Date: January 25, 1972
Creator: Romrell, D. M.
Partner: UNT Libraries Government Documents Department
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Vietnamization: The Program and Its Problems

Description: This report addresses the program and the problems of Vietnamization.
Date: January 5, 1972
Creator: Niksch, Larry A.
Partner: UNT Libraries Government Documents Department
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Energy resources of the United States

Description: Estimates are made of United States resources of coal, petroleum liquids, natural gas, uranium, geothermal energy, and oil from oil shale. Accuracy of the estimates probably ranges from 20 to 50 percent for identified-recoverable resources to about an order of magnitude for undiscovered-submarginal resources. The total cost resource base in the United States is estimated to be about 3,200 billion tons, of which 200 to 390 billion tons can be considered in the category identified and recoverable… more
Date: January 1, 1972
Creator: Theobald, P. K.; Schweinfurth, S. P. & Duncan, D. C.
Partner: UNT Libraries Government Documents Department
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Neutron Energy Spectrum of a Po-Be (alpha,n) Source

Description: The newtron energy spectrum of a Po-Be (alpha, n) source was measured as part of an intercomparison of newtron energy spectral measurements sponsored by Oak Ridge National Laboratory. Intensity maxima for neutron energies > 1 MeV were seen at or near 1.4, 2.1, 3.1, 5.0, 6.7, 7.7 and 9.7 MeV.
Date: January 17, 1972
Creator: Anderson, M. E.
Partner: UNT Libraries Government Documents Department
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New absolute high pressure gauge

Description: A new absolute pressure measurement system based on the simultaneous measurement of length and ultrasonic transit times is described. The system was used to determine the transition pressure of pure mercury at 0 deg C at 7571.2 plus or minus 1.6 bars. It is particularly advantageous to use a device for calibrating secondary gauges such as manganin gauges inasmuch as it gives a highly accurate measurement of nonlinearities in such secondary gages. The gage calibrated in the present study reaches… more
Date: January 1, 1972
Creator: Ruoff, A. L.; Lincoln, R. C. & Chen, Y. C.
Partner: UNT Libraries Government Documents Department
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Studies of low temperature phase transformations in high field superconductors and the phonon spectrum and mechanical properties of vanadium. Final report

Description: Extensive studies of the structure and phase transformations of high field superconductors of the BETA -tungsten type were made. A phase transformation was discovered at 43 deg K in Nb/sub 3/Sn and the structure of the low temperature phase was measured. The details of the transformation in terms of the formation of the low temperature tetragonal phase from the high temperature cubic phase was investigated both by x-ray observations and optical microscopy below 40 deg K. The complete phonon dis… more
Date: January 1, 1972
Creator: Batterman, B.W.
Partner: UNT Libraries Government Documents Department
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Effects of retardation on electromagnetic self-energy of atomic states

Description: The significance of retardation effects in photon emissions and absorption is emphasized in the calculation of self-energy. It is explicitly demonstrated that inclusion of such effects leads to a finite answer for the shifts of atomic energy levels in a nonrelativistic theory without cutoff. Ambiguities that exist in the mass renormalization in the non-relativistic approach are pointed out. Such ambiguities vanish from the relativistic theory. Explicit calculation is carried out in the case of … more
Date: January 1, 1972
Creator: Au, C.K. & Feinberg, G.
Partner: UNT Libraries Government Documents Department
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Final technical report, August 15, 1971--August 14, 1972

Description: Work to date on mutations of the incompatibility factors and other genes affecting their expression in Schizophylium commune is briefly summarized. A second line of research, biochemical consequences of development in Schizophyllum, is also briefly reported. Four separate papers have been published to date on work under the contract. (LMT)
Date: January 1, 1972
Creator: Raper, J R & Hoffman, R M
Partner: UNT Libraries Government Documents Department
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Direct Iterative Decoupling Procedure for Multivariable Control System Design

Description: A design technique has been developed, for a limited class of systems, which provides a state variable control design resulting in a decoupled, conditioned system. A controller was designed for both linear and non-linear fourth order models of a nuclear rocket engine. A direct non-linear control synthesis was performed. The non-linear control exhibited constant decoupled performance in control of the highly coupled non-linear engine model and exhibited a stable "type two" control response.
Date: January 1, 1972
Creator: Openshaw, F.L.
Partner: UNT Libraries Government Documents Department
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Radiological and Environmental Research Division annual report, January-- December 1972

Description: Results are reported from: measurements of nocturnal wind flow over St. Louis; measurement of wind velocity and pressure at Chicago Midway Airport; micrometeorological measurements and determination of the average diurnal surface budgets and evaporation rate of the Great Lakes; and applications of wind turbulence statistics to predict pollution dispersions over water. (CH)
Date: January 1, 1972
Partner: UNT Libraries Government Documents Department
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