Interaction of electronic current with hypersonic waves in solids Quarterly progress report no. 1, 1 Oct. - 31 Dec. 1963

Transducer applications of ultrasonic amplification in piezoelectric cadmium sulfide semiconductors at ultrahigh and microwave frequencie

Interaction of electronic current with hypersonic waves in solids Quarterly progress report, 1 Jan. - 31 Mar. 1964

Interaction of electronic current with hypersonic waves in solids - current saturation effects and build-up of acoustic flux in cadmium sulfid

Interaction of electronic current with hypersonic waves in solids quarterly progress report no. 3, apr. 1 - jun. 31, 1964

Electronic current interaction with hypersonic waves in cadmium sulfide crysta

Interaction of electronic current with hypersonic waves in solids Technical summary report, 1 Oct. 1963 - 30 Sep. 1964

Current saturation, noise spectrum, low frequency oscillation, radio frequency, and optical measurements in cadmium sulphide when electric field exceeds sound velocit

Electric-arc heater Patent

Magnetically diffused radial electric arc heate

A magnetically rotated electric arc air heater employing a strong magnetic field and copper electrodes

Magnetically rotated electric arc air heater using strong magnetic field and copper electrode

Pregnancy Counselors\u27 Perceptions of Disrupted Infant Adoptions

This exploratory study explores birth parents who changed their minds and removed their child from the adoptive home; what factors seemed influential in that decision; and what pregnancy counselors think could have prevented the disruption. Eight pregnancy counselors participated in a semi-structured interview. The initial findings indicated that: (1) infant disruptions comprised a very small number of infant adoptive placements; (2) pregnancy counselors perceived that nothing could have been done to prevent the disruption, except mandatory foster care; and (3) the reasons that birth parents reverse their adoption decision are often complex and unforeseen. Additional studies utilizing birth parents and varied methodologies are needed to better understand this understudied population of birth parents who reverse their adoption plan and remove their child from adoptive homes

Development of dynamic calibration methods for POGO pressure transducers

Two dynamic pressure sources are described for the calibration of pogo pressure transducers used to measure oscillatory pressures generated in the propulsion system of the space shuttle. Rotation of a mercury-filled tube in a vertical plane at frequencies below 5 Hz generates sinusoidal pressures up to 48 kPa, peak-to-peak; vibrating the same mercury-filled tube sinusoidally in the vertical plane extends the frequency response from 5 Hz to 100 Hz at pressures up to 140 kPa, peak-to-peak. The sinusoidal pressure fluctuations can be generated by both methods in the presence of high pressures (bias) up to 55 MPa. Calibration procedures are given in detail for the use of both sources. The dynamic performance of selected transducers was evaluated using these procedures; the results of these calibrations are presented. Calibrations made with the two sources near 5 Hz agree to within 3% of each other

A dynamic pressure source for the calibration of pressure transducers

A dynamic pressure source is described for producing sinusoidally varying pressures of up to 34 kPa zero to peak, over the frequency range of approximately 50 Hz to 2 kHz. The source is intended for the dynamic calibration of pressure transducers. The transducer to be calibrated is mounted near the base of the thick walled aluminum tube forming the vessel so that the pressure sensitive element is in contact with the liquid in the tube. A section of the tube is filled with small steel balls to damp the motion of the 10-St dimethyl siloxane working fluid in order to extend the useful frquency range to higher frequencies than would be provided by an undamped system. The dynamic response of six transducers provided by the sponsor was evaluated using the pressure sources; the results of these calibrations are given