Discussion: “Theoretical and Experimental Analysis of Hydrostatic Thrust Bearings” (Elwell, R. C., and Sternlicht, B., 1960, ASME J. Basic Eng., 82, pp. 505–511)

Abstract

obtained from this system. This figure is a reduced-size reproduction of a typical set of curves, for an orifice-compensated bearing with four different supply pressures. Each trace has two or three runs on it, showing the reproducibility of this method of data taking. The capacitance gage was calibrated externally in a precisionmicroscope stage, then mounted above the runner. Zero film thickness was obtained bj r loading the bearing and shutting oft' the oil supply. After several minutes, the oil was virtually squeezed out from between the bearing lands and runner, and the zero reading was taken. An error of about-0.0002 in. is noted at maximum load on the lower curve and decreasing amounts 011 the higher curves. This is believed to be due to a lack of squareness in the pen movement of the X-l'-recorder, and is estimated to be the order of accuracy of the film-thickness measurement. Because of the nonlinearity of the capacitance-gage output, the error at larger film thicknesses is below the 0.0002-in. value. DISCUSSION Alfred M. Loeb 2 This discusser and Mr. Stanley B. Malanoski have conducted a similar investigation into the performance of hydrostatic bearings under various methods of compensation.

Investigation of ion–ion-recombination at atmospheric pressure with a pulsed electron gun

“…25 The decay depends on the concentrations N + and N À and the recombination coefficient k r . This recombination coefficient is an ion specific reaction rate that depends on the involved reaction partners, here the positive and negative ions.…”

“…Due to the primary excess of electrons from the ionization source the number of anions (601) is slightly higher than the number of cations (600) which will be neglected in the folowing. 26 Thus, the number of cations and anions in the field-free reaction region is assumed to equal N + ¼ N À ¼ N. Furthermore, assuming that only singly ionized ions exist in the ion cloud, 25 the ion concentrations N + and N À can be replaced by the measurable charges of the cations |Q + | and anions |Q À | and eqn (2) can be rewritten as follows.…”