UNT Libraries Government Documents Department - 11 Matching Results

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open access

Microprocessor controlled, personnel thermoluminescence dosimetry reader

Description: Using a DEC LSI-11 microprocessor, a thermoluminescence dosimetry reader for personnel dosimetry has been developed. This microprocessor provides system control, accumulates data for temporary storage on a cassette, and later outputs the data to a large computer. The microprocessor also provides a human/system interface through a computer terminal. A programmable high-voltage supply and a light-emitting diode are used in the reader system to automatically control photomultiplier tube gain.
Date: October 10, 1978
Creator: Hunt, Gerald F.
open access

Enhancement of methane production in the anaerobic digestion of sewage sludges

Description: The effect of powdered activated carbon on stressed anaerobic digesters utilizing a sewage sludge substrate was evaluated. The addition of carbon resulted in increased methanee production and greater process stability. The degree of enhancement appeared to be proportional to carbon concentration over the dose range studied (500-10,000 mg/l). A maximum increase in methane production of about 150% was observed at the highest carbon dose. The effect of 1500 mg/l carbon, 4000 mg/l coal, and 4000 mg… more
Date: May 10, 1978
Creator: Spencer, R. R.
open access

Heat transfer from internally-heated molten UO/sub 2/ pools. [PWR; BWR]

Description: Experimental measurements of heat transfer from internally heated pools of molten UO/sub 2/ have been obtained for two cell sizes: 10 cm x 10 cm and 20 cm x 20 cm. The experiments with the large cell have supported a previous conclusion from early small data that the measured downward heat fluxes are higher than would be expected on the basis of considerations of thermal convection. A convective model underpredicts the downward heat fluxes by a factor of 2.5 to 4.5 for all but one early experim… more
Date: October 10, 1978
Creator: Stein, R. P.; Baker, L., Jr.; Gunther, W. H. & Cook, C.
open access

Studies of tandem mirror confinement

Description: This paper describes a number of physics studies relevant to tandem mirror confinement. We give the basic axial confinement laws and show that T/sub e/ depends critically upon end loss. Sufficient central-cell end loss can stabilize the drift-cyclotron loss-cone mode in the plugs, although the resultant T/sub e/ scaling is too slow for reactors. Minimum-B plugs stabilize flute MHD- and rotation-driven modes; local ballooning sets limits on ..beta.. > or equal to 0.5. Proper magnetic symmetry is… more
Date: July 10, 1978
Creator: Baldwin, D. E.; Cohen, R. H.; Foote, J. H.; Hall, L. S.; Kaiser, T. B.; Logan, B. G. et al.
open access

Field reversal in mirror machines

Description: This report discusses some of the physics issues anticipated in field-reversed mirrors. The effect of current cancellation due to electrons is described. An estimate is made of the required impurity level to maintain a field-reversed configuration. The SUPERLAYER code is used to simulate the high-..beta.. 2XIIB results, and favorable comparisons require inclusion of quasilinear RF turbulence. Impact of a quadrupole field on field-line closure and resonant transport is discussed. A simple self-c… more
Date: July 10, 1978
Creator: Pearlstein, L. D.; Anderson, D. V. & Boozer, A. H.
open access

Tandem mirror physics and TMX

Description: The Tandem Mirror Experiment (TMX) is being built at Livermore to test the principles of the new tandem mirror reactor concept. In this concept the fusion plasma is confined in a long solenoid terminated at each end by mirror machines of the magnetic-well type. High density plasmas are maintained in each of the mirror end cells by neutral injection at high energies (up to 1 MeV in a high Q reactor). The usual positive ambipolar potential that automatically develops in each mirror cell serves as… more
Date: August 10, 1978
Creator: Fowler, T.K.
open access

U. S. Mirror Program

Description: The mirror approach is now the principal alternate to the tokamak in the U.S. magnetic fusion energy program. The program is now focused on two new concepts that can obtain high values of Q, defined as the ratio of fusion power output to the neutral beam power injected to sustain the reaction. These are the tandem mirror and field reversed mirror concepts. Theoretically both concepts should be able to attain Q = 5 or more, as compared with Q approximately 1 in previous mirror designs. Success w… more
Date: August 10, 1978
Creator: Fowler, T. K.
open access

Reduction of irradiation-induced creep by point defect trapping

Description: The theory of point defect trapping was applied to predict the effect of solutes on the steady-state dislocation climb creep rate. Vacancy loops generated in the cascades of point defect production by heavy particles were included. It is shown that the effect of vacancy loops on the creep rate is mathematically equivalent to a simultaneous reduction in the vacancy trapping rate at solutes as well as in the free point defect generation rate and recombination coefficient. These parameters are red… more
Date: July 10, 1978
Creator: Mansur, L. K. & Wolfer, W. G.
open access

Estimates of time-dependence fatigue behavior of type 316 stainless steel subject to irradiation damage in fast breeder and fusion power reactor systems. [Fluence 1--2. 63 x 10/sup 26/ n/m/sup 2/ (E > 0. 1 MeV/ at 593/sup 0/C]

Description: Cyclic lives obtained from strain controlled fatigue tests at 593/sup 0/C from specimens irradiated to a fluence of 1 to 2.63 x 10/sup 26/ n/m/sup 2/ (E greater than 0.1 MeV) were compared to predictions based on the method of strainrange partitioning. When appropriate tensile and creep-rupture ductilities were employed reasonably good estimates of the influence of hold periods and irradiation damage on the fully reversed fatigue life of type 316 stainless steel could be made. Ductility values … more
Date: July 10, 1978
Creator: Brinkman, C.R.; Liu, K.C. & Grossbeck, M.L.
open access

Feasibility studies of thermonuclear neutron capture synthesis of SHE

Description: A variety of thermonuclear neutron sources and neutron capture targets were investigated for their potential of allowing signigicant production of heavy, perhaps superheavy, isotopes. The neutron sources considered range from inertial confinement microexplosives to (underground) macroexplosives. Optimal capture targets appear to be composites containing uranium and protactinium. 1 figure.
Date: April 10, 1978
Creator: Meldner, H.W.
open access

Overview of the M. A. I. T. analysis system (machine analysis of the internal threat). [Collusion and illicit use of access]

Description: The problem of the internal threat epitomized by the tactics of collusion and illicit use of access has been structured into a data processing format. The format procedures and analysis are objective; the flexibility of the method allows the security analyst to input his judgment and opinions into the code. By so doing he can interact and determine the effects of interacting with the safeguard system.
Date: April 10, 1978
Creator: NiCastro, J.R.
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