Aerospace & Aviation

Scattering matrix and chemical reaction rates

Observations of five ionization stages of iron in the solar corona using the climax coronagraph

Charge-separation mechanism for the production of polar auroras and electrojets

This is a report of the second three months (March-May 1961) of a program to design and fabricate an ultraviolet spectrometer and fine guidance control for use in an Aerobee-Hi rocket. The work is being done under Subcontract No. 1 under Contract NASr-3 between Princeton University and the National Aeronautical and Space Administration. The design goals for this instrument are described in the report for the first three month period (Perkin-Elmer Engineering Report No. 5906). The accomplishments of the second three month period include the solution of certain design problems, the establishment of an effective liaison system with personnel at Goddard Space Flight Center, and the completion of certain design and fabrication tasks.

The problem of the interaction of electromagnetic radiation with non-uniform surfaces is approached statistically. By suitable choice of the second probability distribution for the surface one finds the calculated back-scattering cross-section to depend exponentially on the angle of incidence. Upon comparison of the calculated scattering cross-section and measured lunar and terrestrial returns, one finds that the model can account for the scattering from a rough surface out to incidence angles of nearly 30°; the model prescribes slopes for the lunar surface of up to 15°. One finds also that the model can account for the measured power reflection coefficient of the lunar surface.

No abstract available

Solar parallax and related constants

Cause of the preliminary reverse impulse of storms

Analyses are presented for the elastic buckling of a thin circular disc subjected to a steady-state, two-dimensional, radially- symmetrical temperature gradient. Ritz minimizing procedure were used to evaluate parameters for the critical temperature difference and for the mode of buckling. Numerical solutions were obtained on a digital computer for the boundary conditions of inner radius fixed and outer radius either free or fixed for discs with diameter ratios of 1.25 to 12. values for the range of diameter ratios tested.

Effect of geomagnetic fluctuations on trapped particles

Submicron metal powder production by ball-milling

Frequencies and modes of vibration of buckled circular plates

Shock tube for gas dynamics studies

Quantitative determination of human body temperature regulating mechanism

Radio experiments from satellites and rockets