1970
DOI: 10.21236/ad0705170
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VHF Antenna System for Aircraft

Abstract: Presented are the initial results of a theoretical investigation of crossed-slot antenna elements arrayed on an aircraft to provide communications with satellites in the 225 to 400 MHz frequencyrange. Calculations indicate that two four-element array antennas can approximate the desired performance of covering the hemisphere above the aircraft with more than 6 dB directive gain. Including the polarization loss between the elliptically polarized aircraft antenna and the circularly polarized satellite antenna, c… Show more

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“…The first area focuses on enduring, less controllable influences on the individual (Dohrenwend & Dohrenwend, 1969Zubin & Spring, 1977). For example, Zubin and Spring (1977) view vulnerability as a trait that is the result of genetic inheritance (Kallmann, 1959;Rosenthal, 1970) as well as propensities acquired through experience. According to this view, the degree of distress induced by "challenging events" is determined by whether or not the vulnerability threshold is crossed and maladaptation ensues (Mechanic, 1967).…”
Section: Mod$ier Variablesmentioning
confidence: 99%
“…The first area focuses on enduring, less controllable influences on the individual (Dohrenwend & Dohrenwend, 1969Zubin & Spring, 1977). For example, Zubin and Spring (1977) view vulnerability as a trait that is the result of genetic inheritance (Kallmann, 1959;Rosenthal, 1970) as well as propensities acquired through experience. According to this view, the degree of distress induced by "challenging events" is determined by whether or not the vulnerability threshold is crossed and maladaptation ensues (Mechanic, 1967).…”
Section: Mod$ier Variablesmentioning
confidence: 99%
“…Another category of disorders with a significantly higher hospitalization rate for blacks than Caucasians is that of psychoses; as would he * expected, black officers have a higher rate of medical separations for these same reasons. In explaining blacks' higher risk for psychoses, other researchers have identified both genetics and occupational stress as ,* factors associated with the incidence of mental ill health (Rosenthal, 1970;Cooper and Marshall, 1976).…”
mentioning
confidence: 99%