Abstract: A method for growing Group III nitride materials using a molten halide salt as a solvent to solubilize the Group-III ions and nitride ions that react to form the Group III nitride material. The concentration of at least one of the nitride ion or Group III cation is determined by electrochemical generation of the ions.

Abstract: Improvements in electronic apparatus connected with operation of ultrasonic thermometers consisting of an initiating electrical pulse generator which permits selection of the repetition rate at which the ultrasonic thermometer is to be operated, and, to avoid electrical interference caused by power switching, selective commencement of the initiating electrical pulse relative to the power line. Electronic amplifying and transmitting circuitry receiving the reflected information signal pulses from the ultrasonic thermometer amplify the pulses for transmission to pulse processing circuits remotely located from the furnace, assuring that sufficient signal amplitude is received by means of a returned automatic gain control signal to the amplifying and transmitting circuitry.