Engineering topics

Evans, R. E.

Publications and source records attributed to Evans, R. E..

7 records

NASA NTRS1975

Apollo-Soyuz US-USSR joint mission results

The technical and nontechnical objectives of the Apollo-Soyuz mission are briefly considered. The mission demonstrated that Americans and Russians can work together to perform a very complex operation, including rendezvous in space, docking, and the conduction of joint experiments. Certain difficulties which had to be overcome were partly related to differences concerning the role of the astronaut in the basic alignment and docking procedures for space vehicles. Attention is also given to the experiments conducted during the mission and the approach used to overcome the language barrier.

Bean, A. L.↗

NASA NTRS1973

Geological observations from lunar orbit

The visual observations of the lunar surface from the command module of the Apollo 17 flight are presented. Detailed descriptions of the observation sites are given.

Evans, R. E.↗

NASA NTRS1973

Zodiacal light photography

Polarized and red- and blue-filter photographs of zodiacal light obtained by Apollo 17 are analyzed. Attempts were made to identify the cause of subtle change in the observed light and determine the dust composition of the light. A comparison of red and blue images indicates such changes may be caused by particle size distribution and range, number of particles along any given line of sight, particle surface characteristics including dielectric compared to metallic properties, and variations of the parameters as a function of distance from the sun.

Mercer, R. D.↗

NASA NTRS1973

Solar corona photography

An analysis was made of Apollo 17 solar corona photographs in an effort to identify coronal streamers observed from earth. The photographs corroborate earth based observations; moreover, visual observations made by the Apollo crew indicate clearly identifiable streamers which extend to approximately 100 solar radii.

Macqueen, R. M.↗

NASA NTRS1973

Observations of Mare Serenitatis from lunar orbit and their interpretation

Visual observations are investigated of color differences of Serenitatis mare materials from orbit complement photography and other remotely sensed data. The light tan gray inner fill of the Serenitatis basin is younger than the dark blue gray annulus; the latter continues into and appears to be contemporaneous with the fill of Mare Tranquillitatis. Mare ridges occur in both the inner basin fill and the dark annulus of Serenitatis. Ridges are interpreted as the result of structural deformation and up-doming after the solidification of the basaltic lavas. On the southeastern rim of the Serenitatis basin is the darkes blue gray unit within which Apollo 17 landed. Highland massifs surrounding this unit have unstable slopes which are believed to be the result of localized tectonic activity. On the southwest rim of the basin are the dark tan to brown gray mantling materials of the Sulpicius Gallus Formation. Farther west on the rim are dark blue grap patches which resemble the mare material of the Serenitatis dark annulus.

El-Baz, F.↗

NASA NTRS1973

Observations of Mare Serenitatis from lunar orbit and their interpretation

Visual observations of color differences of Serenitatis mare materials from orbit complement photography and other remotely sensed data. The light tan gray inner fill of the Serenitatis Basin is younger than the dark blue gray annulus; the latter continues into and appears to be contemporaneous with the fill of Mare Tranquillitatis. Mare ridges occur in both the inner basin fill and the dark annulus of Serenitatis. Ridges are interpreted as the result of structural deformation and up-doming after the solidification of the basaltic lavas. On the southeastern rim of the Serenitatis Basin is the darkest blue gray unit within which Apollo 17 landed. Highland massifs surrounding this unit have unstable slopes which are believed to be the result of localized tectonic activity. On the southwest rim of the basin are the dark tan to brown gray mantling materials of the Sulpicius Gallus Formation.

El-Baz, F.↗

NASA NTRS1972

A simple recording thickness gauge.

An account is given of the construction and operation of a device which allows an Instron universal testing machine to produce a continuous autographic record of thickness or contour of specimens and small parts. This device has proven useful in the nondestructive measurement of irregular cross sections.

Evans, R. E.↗