Aerospace & Aviation

Bibliography on biosensors, a sampling of world literature, 1900 through 1961

Hydrogen, lithium and helium as propellants for electrothermal jet engines

Effects of coupling between pitch and roll control inputs on handling qualities of vtol aircraft

Proton-proton spin decoupling method for the determination of nuclear magnetic chemical shifts

Theory of auroral morphology

Upper atmosphere of the planets

Earth magnetic field effects on measurements of doppler shift in satellite transmission

Tubing connection effects on transducer response for transient pressure measurement

Grenade vibration and ejection tests with a nose cone for the nike-cajun rocket

Particle charging technique to simulate micro- meteorite bombardment on space vehicles

Correlation radiometer technique

We have investigated the Landau damping of transverse waves propagating in the thermal exospheric plasma, by fast particle fluxes which also exist in these regions. The most intense non-thermal fluxes so far detected are those of the auroral producing electrons and protons measured by McIlwain. We find that these fluxes may considerably damp the propagation of whistler modes through some regions. The damping of hydromagnetic waves in the exosphere by this mechanism is negligible.

The objective of this program was to establish whether terrestrial life forms can survive and thrive in extraterrestrial environments. Other than Earth, the only solar body capable of supporting terrestrial life appears to be the planet Mars. The conditions selected to simulate a Martian environment were determined by a literature search and were: 1) Light of > 4800-A wavelength 2) Temperature changes from a diurnal high of 30 °C to a nocturnal low to -60 °C 3) Atmosphere composed of 95% nitrogen, 4% argon, 0.3% carbon dioxide, and less than 1% oxygen and moisture. The organisms tested in thesimjulated Martian environment were: 1) Algae: Trebouxia erici 2) Bacteria: Clostridium tetani, Bacillus subtilis, and Escherichia coli 3) Bryophytes: the liverwort Marchantia polymorpha; the mosses Eurhynchium strigosum, Atrichum undulatum, Mnium sp., Brium sp., Grimmia sp., Pogonatum sp., and Polytrichum sp. 4) Lichens: Cladonia conoeraea, C. rangifernia, C. cristatella, C. pyxidate, Parmelia conspersa var. isidata, P. conspersa var. leucophora, Lecidea cyanea, Umbilicaria dillenii, Physcia hypoleuca, and Ramalina sp. T. erici survived for about 2 weeks. C. tetani and E. coli cells decreased rapidly in number, but the tetanus toxin remained active for the 127=day period of the experiment. B. subtilis cells increased in number. Of the Bryophytes, only one moss survived. Complete results for the lichens are not yet available. It is suggested that the observed color changes on the Martian surface may be explained in part by color changes in the surface vegetation as a function of moisture content.

The analysis determines the time derivatives of the conic-section orbital elements in a disturbed orbit by perturbation methods. Integration of any of the several resulting systems of six first-order linear differential equations by numerical methods can be a useful tool for the solution of problems in orbital mechanics. Equations for the two-body orbit are also summarized in a convenient manner.

Aerodynamic loads on an isolated shrouded- propeller configuration for various angles of attack