This report describes the basic parameters which directly influence the behavior of a coal slurry pipeline transportation system and determine the limitations of the system performance. The purpose of this technology assessment is to provide an identification and understanding of the critical factors which must be given consideration in the design and evaluation of such a slurry haulage system intended for use in an underground coal mine. The slurry haulage system will be utilized to satisfy the transportation requirements of conveying, in a pipeline, the coal mined by a continuous mining machine to a storage location near the mine entrance or to a coal preparation plant located on the surface. Coal-water slurries, particularly those consisting of homogeneous suspensions of small particles, frequently behave as non-Newtonian, Bingham-plastic fluids. For successful operation, slurry transport systems should be designed to operate in the turbulent flow regime and at a flow rate at least 30% greater than the deposition velocity. The deposition velocity is defined as the slurry flow rate at which the solid particles tend to settle in the pipe. Due to the importance of accurately determining the deposition velocity and the uncertainties of current methods for predicting the deposition velocity of coarse …

Steady-state phase relations in the system UO/sub 2 + x/-CeO/sub 2/-ZrO/sub 2/-ThO/sub 2/ were determined for application to phase relations in the high-level crystalline ceramic nuclear waste form Supercalcine-Ceramics. Samples were treated at 1200/sup 0/C at an oxygen partial pressure of 0.21 atm and a total pressure of 1 atm. Phase assemblages were found to be composed of cubic solid solutions of the flourite structure type, solid solutions based on ZrO/sub 2/, and orthorhombic solid solutions based on U/sub 3/O/sub 8/.

The South Coast Technology Volkswagen Rabbit, an electric vehicle manufactured by South Coast Technology of Santa Barbara, California was tested at the Jet Propulsion Laboratory's (JPL) dynamometer facility in Pasadena and at JPL's Edwards Test Station (ETS) located near Lancaster, California. The tests were conducted between April and July, 1979. These tests were performed to characterize certain parameters of the South Coast Rabbit and to provide baseline data that will be used for the comparison of near-term batteries that are to be incorporated into the vehicle. The vehicle tests were concentrated on the electrical drive system; i.e., the batteries, controller, and motor. The tests included coastdowns to characterize the road load, maximum effort acceleration, and range evaluation for both cyclic constant speed conditions. A qualitative evaluation of the vehicle was made by comparing its constant speed range performance with those vehicles described in the document State of the Art assessment of Electric and Hybrid Vehicles. The Rabbit performance was near to the best of the 1977 vehicles.

Samples of calcareous ooze collected from the tropical and equatorial Atlantic Ocean were subjected to hydrothermal alteration in order to simulate the diagenesis of chalk. Changes in mineralogy and morphology of enclosed microfossils were measured. (ACR)

High conductivity ZnSe single crystalline films have been heteroepitaxially deposited on GaAs substrates using open tube chemical vapor transport. Unintentionally doped films had net donor densities of 10/sup 14/ - 10/sup 16/ cm/sup -3/ and resistivities of 1 to 10/sup 3/ ohm cm. Resistivity was found to be strongly dependent upon zinc partial pressure during deposition. Electron mobilities of the order of 50 to 200 cm/sup 2//V sec were observed which suggested that the films are highly compensated. Properties of the deep level defects in heteroepitaxially grown ZnSe have been investigated using transient capacitance spectroscopy. A series of electron traps were observed with activation energies of 0.33, 0.35, 0.42, 0.71 and 0.86 eV in Au/ZnSe Schottky diodes. Trap concentration ranged from 10/sup 12/ to 10/sup 14/ cm/sup -3/ and depended on the zinc partial pressure. A model for the defect structure of ZnSe was proposed. Growth studies of ZnS/sub x/Se/sub 1-x/ on GaAs were begun.

This report presents the results of work performed from October 1, 1980 through December 31, 1980 on the Advanced Gas- Cooled Nuclear Reactor Materials Evaluation and Development Program.