Engineering topics
Publications and source records attributed to Robinson, L. B..
Determination of redshifts for two galaxies in the group associated with the quasi-stellar source PKS 2251 + 11 from the measurements of the H and K absorption lines of Ca II. The measured redshift of the brighter galaxy is within 60 km/sec of the redshift of the quasi-stellar source. The other differs by 1000 km/sec. Strong hydrogen-line emission reported earlier for the brighter galaxy was not detected.
A scanner that uses an image dissector to scan the output screen of an image tube has proven to be a sensitive and linear detector for faint astronomical spectra. The image-tube phosphor screen acts as a short-term storage element and allows the system to approach the performance of an ideal multichannel photon counter. Pulses resulting from individual photons, emitted from the output phosphor and detected by the image dissector, trigger an amplifier-discriminator and are counted in a 24-bit, 4096-word circulating memory. Aspects of system performance are discussed, giving attention to linearity, dynamic range, sensitivity, stability, and scattered light properties.
The preparation of GaAs epitaxial layers by a vapor transport process using AsCl3, Ga and H2 was pursued to provide epitaxial wafers suitable for the fabrication of transferred electron oscillators and amplifiers operating in the subcritical region. Both n-n(+) structures, and n(++)-n-n(+) sandwich structures were grown using n(+) (Si-doped) GaAs substrates. Process variables such as the input AsCl3 concentration, gallium temperature, and substrate temperature and temperature gradient and their effects on properties are presented and discussed.
Small digital computers applications to astronomical electronic instrumentation systems of microphotometry and spectroscopy
Heat transfer rates in turbulent flow of heated gas-solid mixtures through converging-diverging nozzle
Magnetic transitions in terbium and dysprosium as affected by hydrostatic pressure at various high pressures and low temperatures
Thermal and electrical conductivity of a weakly ionized cesium plasma, using onsager phenomenological coefficients