Aerospace & Aviation

The Research Summary is a report of supporting research and development activities at the Jet Propulsion Laboratory, California Institute of Technology. This bimonthly periodical is usually published in two volumes. However, for this issue, all the material has been combined into one volume. To foster a more rapid interchange of original ideas and information throughout the scientific and technical community, all authors' names have been added as bylines to the material they contributed.

Entropy changes in nonequilibrium flows

Instrumentation using neutron activation for remote analysis of planetary surface composition

In order to incorporate the advantages of ballistic range testing with the convenience of wind tunnel testing, simplified techniques have been developed at the Jet Propulsion Laboratory (JPL) for free-flight testing of models in a conventional wind tunnel. So far, only a small number of the many possibilities have been investigated, but the preliminary results indicate that such techniques are both practical and useful. The model to be investigated is suspended on a single traverse wire at the upstream end of the test section window, then is released from this position by causing the wire to break within the model. High speed motion pictures taken of the model oscillating during its travel across the viewing area make it possible to determine various aerodynamic parameters such as drag, lift, pitching moment, and pitch damping in much the same manner as is done in ballistic range testing. Also, a spark schlieren photograph can be taken of the model in flight in order to observe details of an undisturbed (from support interference) wake.

Linear estimation applied to the numerical solution of differential equations

Lower bounds of buckling pressure of spherical shells

Effect of carbon dioxide on ph of algal culture media

Antibody inhibition of frog egg fertilization

Techniques and instrumentation for measurements of ultraviolet solar emission spectrum

The aeolosphere and atmosphere of venus

Electrolytic production of oxygen and reduction of carbon dioxide

Environment for manned space fight

Cavitation scale and thermodynamic effects in stationary and rotating components

Coordinates for mapping the distribution of magnetically trapped particles

Controllable thrust chamber study program