This thesis discusses the design and evaluation of an instrument that can estimate the probability density distributions of bandlimited, aperiodic electrical phenomena. This estimator can obtain the probability density estimates of signals that are contained within the frequency range of 100 cps. to 20 kcs. However, the basic design logic...
The logic control system of a computer automatically sequences
logic operations which direct how and when memory stored instructions
and data are processed in the digital registers.
This thesis contains circuit schematics and test results of a
nanosecond response logic - control system for the Galaxy Computer.
The circuit designs...
Reliability, the probability that a system will not fail but will
perform correctly at least until some arbitrary time, is becoming
an increasingly important concept in electronic system design. This
probability is evaluated using probability density functions which are
obtained analytically by forming mathematical expressions describing the failure distributions of...
With the advent of underground testing, the study of the propagation of seismic signals has become of great importance. This thesis investigates the design of electrical analogs to represent the propagation of seismic waves. The analogs developed allow for the study of the effects of variations in the characteristic constants...
A method of locating electric transmission line towers using
ground survey data in a digital computer program is presented in this
thesis. The towers are located for maximum spacing subject to the
constraints of available tower heights, forbidden ground areas, minimum
ground clearance, and specified conductor tensions. The digital
method...
Some important factors that affect the dimensional
control of oxide films on silicon were studied. Both N- and
P-type silicon with resistivities in the range of
0.014 to 200 ohm-cm and a (111) surface orientation
were employed in this experiment. The etching rates of
silicon dioxide in hydrofluoric acid (111)...
The demand for transistor circuitry to perform within more
exacting specifications has created the need for a method to accurateIy predict transistor circuit performance. A method utilizing an
electronic digital computer for the analysis of direct-coupled transistor
amplifiers is explained in this paper.
The dc bias levels and the mid-band...
A multivariable model describing the system response
(weld tensile strength of 6061-T6 aluminum) of a percussive
stud welding system as a function of five natural
(external) system variables was developed. The five natural
system variables were 1) static weight of the drop-shaft (W), 2) initial stud base height (H₀), 3)...
This paper discussed the human electrocardiogram, the instrumentation
used to graphically record it, and the design and performance
of a specialized system for vector cardiography: the Vector Electrocardioscope
(VECS) System. The introduction reviews in considerable
detail the pertinent known physiology of the heart, especially the
electrophysiology responsible for the genesis...
Instruments which combine the features of a digital-to-analog
conversion and a linear-to-logarithmic scale change usually perform
the digital-to-analog conversion first. These instruments are accurate
to within five or ten percent over ranges of five or six decades.
This thesis presents a method which uses combinatorial logic
to perform the linear-to-logarithmic...
It was observed that certain myoelectric surface
potentials are of a pulse nature. The pulses have nearly
the same exact waveshape, but are asynchronously
repetitive.
Physiological evidence indicated that myoelectric
pulses are concurrent with the activity of a small unit
of organized muscle fibres (motor unit). The electrical
activity of...
This thesis describes the control circuitry for a
telemetry system developed to report hydrologic information
from remote locations. The multiparameter,
on-call system operates on a single frequency. Each
remote station responds to a predetermined number of
pulses from the master station. Data is transmitted by
pulse- duration modulation.
In the...
This thesis proposes a criteria for the evaluation of those variable
parameters that influence the response of a hydroelectric generator
driven by a hydraulic turbine of the Kaplan type. It is considered
a requirement that a unit must be stable when supplying an isolated
load and it is assumed that...
In this paper, the theory of metal-semiconductor contacts was
applied to metal contacts on gallium arsenide. A model was discussed
which proposed that the contact resistance was due to a highly
resistive region between the metal and the semiconductor. In order
to evaluate this resistance, a technique using a VHF...
Because the life processes of the plant are related in a complex
way to the balance between the water demand of the atmosphere and
the water availability to the plant root, an exploration of the dynamic
status of water in the plant is very important. The stomata constitute
the main...
This thesis discusses the design and evaluation of an instrument
that can detect known signals in noise. This detector uses
two integrators to sense a difference in the received signal between
half-cycles of the known signal.
The detector is useful for sensing signals in the approximate
frequency range of 100...
The comparative values of impedance and resistance to reactance
ratios are important parameters in determining the load
capacity of an interconnection of power transformer, called a bank.
The full design capabilities of parallel or three-phase connected
transformers cannot be utilized unless the following constraints are
applied.
1. All transformer voltage...
This thesis presents some experimental results for
producing controlled PN and NPN diffused structures in
silicon by varying the strength of the diffusion sources.
Boron diffusions were carried out in a N₂ atmosphere at
1200°C with 10%, 20%, 30% and 40% B₂0₃ in silicic acid as
sources. Phosphorus diffusions were...
The force, temperature, and time relationships were
investigated by using oscilloscope measurement techniques. Force was measured using a strain gage and the dynamic
response recorded with a polaroid oscilloscope camera.
Temperature was measured with a tungsten-rhenium thermocouple
and recorded in the same manner. Residual stress
measurements were made to determine...
Because of its characteristics, the square-loop magnetic core
can be used as the basic device in a logic system. A magnetomotive
force (mmf) which is below the threshold mmf of such a core will
cause a negligible, nonpermanent amount of flux change in the core;
and information signals can be...
Measurements
were
made
of the
energy
loss
in
a
superconducting
wire
coil
subjected
to
an
axial
magnetic
field
consisting
of
a
ripple
field
superimposed
on
a
steady
field.
The
loss
was
measured
calorimetrically
using
a
sonic
thermometer
consisting
of
a
resonance tube
filled
with
helium
gas
in
thermal
contact
with...
The relationships of the variables of a process to be controlled
are expressed in a mathematical model of the process. In the
case of the rolling of metal the process is described by the physics
of the deformation of the metal in the roll gap. In developing the
theory of...
This dissertation describes a new radio-frequency power-amplifier circuit and mode of operation that exceeds the efficiency of the conventional class C amplifier in the low and medium h-f range. It will be found useful in applications where linearity between the input and output are not required, as in all applications...