Leptarctia californiae (Walker) was studied on clear and semi-forested southern slopes in the Coast Range Mountains of Benton County, Oregon. The spring of 1965 had an unusually long warm period (21 days) resulting in adult emergence approximately 25 days earlier than in the cooler spring of 1966. Peak flight activity...
The stability of a third-order, nonlinear system with a
saturation characteristic was studied by applying the second method
of Liapunov, which is the most general approach currently used for
dynamic systems.
This thesis presents (1) the analysis of a third-order, nonlinear
system, (2) a suitable Liapunov function, generated by the...
A circuit designed to generate and maintain a constant magnetic
flux is presented by using a sample-data control system, instead of a
continuous control system.
A Hall generator is used as the magnetic sensing element, and
is operated with a pulse bias to allow a large output. The output of...
In this thesis, characteristics of coupled trigonometric transmission
lines are studied, based on the general theory of nonuniform
transmission lines. The four-port transmission matrix parameters
of the coupled trigonometric transmission lines are derived from the
even and odd mode waves. Two applications of coupled trigonometric
transmission lines are presented; one,...
It is often necessary in communication systems to detect very
small signals that are buried in noise. One device used to accomplish
this is a lock-in amplifier. Initially the theory of operation is considered.
Then the circuit design of a low cost lock-in amplifier is
given. The amplifier, employing linear...
A short history is given of cathode-ray tubes, from the
earliest laboratory tubes available during the early 1900's through
present day high performance tubes. Special attention is paid to
the development of post-deflection acceleration types especially
band-type PDA tubes and an improvement on that type known as the
helix-type PDA...
In this thesis a method is presented for maintaining the left
ventricular wall stress of the human heart at a constant level during
the systole (active portion of the heart's cycle). This constant stress
level makes it possible to take isotonic measurements on the heart
muscles.
The left ventricle of...
A pulse reader for ionization chambers has been developed,
tested, and calibrated. An insulated gate field effect transistor
(IGFET) was used to detect the pulses and Victoreen Model 362
Pocket Chambers were used as ionization chambers. The energy
dependence of the Victoreen Model 362 Pocket Chamber was determined
to be...
Due to the present trend to utilize both virtual memory and
paging for the implementation of storage for large-scale computer
systems, it is of interest to analyze the pertinent parameters
associated with the operation of a paging system. This paper
describes the paging process and determines the effect of variations...