"The results of studies of four reentry guidance and control techniques for the energy management of vehicles returning to the earth at escape speeds are compared in this paper. The reentry trajectories are constrained to those of direct descent, that is, where the vehicle does not leave that portion of the atmosphere where useful aerodynamic forces are available after its initial entry. The guidance techniques compared are (1) a piloted simulator study reference trajectory techniques (2) A...

Thesis (doctoral)--Bern, 1961.

Atlantic oyster drill. Gastropoda.

Thesis (Ph. D.) - University of North Carolina, 1961. , Bibliography: leaves 41-46.

Fields of Research::290000 Engineering and Technology

The work described in this thesis represents the results of an investigation undertaken with the dual intention of (a) establishing the apparatus and techniques necessary for carrying out investigations into the work-hardening behaviour of metals under-going plastic deformation, and (b) examining the work-hardening behaviour of polycrystalline copper during interrupted tensile testing. The first part of the investigation required the development of the basic apparatus for investigations of the t...

Age composition, growth rate, and year-class strength of Yellowstone Lake cutthroat trout from collections made in 1948 and from 1950 to 1959 are analyzed to relate total catch changes in age composition and growth rate. An increase in growth rate of fish fully recruited to the fishery and a decrease in percentages of fish belonging to age groups VI and VII are attributed to an increase in fishing pressure. Mean age of the catch varied with year-length of the catch has remained high, suggesting ...