An analog simulation of the postural control system (PCS) of a
dog is used to illustrate how modern systems simulation can be applied
to a study of complex life systems. Even though many bold
assumptions were required to adequately simplify the PCS model, the
simulation provided intuitive insight and gave...
The primary purpose of this study was to determine whether
there were significant differences between Oregon community
college collegiate freshmen and Oregon State University freshmen in
terms of interest, values, and manifest needs.
The study was limited to a representative sample of the freshman
population in the lower-division collegiate program...
A study was undertaken in the Marys Peak watershed with the
following objectives. First, a classification of the major plant communities
was carried out. Second, some of the ecological features
of Acer circinatum that account for its distribution within these
communities were determined. The following plant communities
are described:
Corylus...
The application of residue notation is another
approach for solving the problem of carry propagation in
arithmetic units. Most other methods for solving this
problem are based on changes in adder design and the use
of improved components.
Residue arithmetic has the inherent property of
requiring no carries between moduli....
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 rheostat is an adjustable resistor so constructed that its resistance may be changed without opening the circuit in which it may be connected. Conventional rheostats are adjusted mechanically. This thesis presents a method of adjusting resistance electrically by varying the light intensity incident on the surface of a photoconductive...
For many applications it is desirable to be able to experimentally determine the impulse response of a linear system while it is in operation. Use of correlation techniques allows this to be done
without noticeably disturbing the quiescent output value of the system.
An impulse response measurement apparatus is designed...
Certain fluids exhibit an increase in flow resistance when subjected to an electric field. This electroviscous response, known as the
Winslow effect, has been the basis for development of a unique control
medium. Applying a strong potential across the fluid causes it to
"stiffen", even to the point of ceasing...
The vertical reference system being considered utilizes a two-degree-of-freedom gyroscope configured as a vertical gyro. Each
gimbal erection circuit forms a second-order feedback control system.
Gyros are susceptable to a number of error sources. In view
of the closed loop application being considered, all error sources are
of negligible consequence...
Phase-space trajectories are often used to describe a system's
stability or response characteristics. It is desirable to observe such
a phase-space trajectory directly from an analog simulation of a
system, but a conventional oscilloscope display does not provide an
axis for the third variable,
A third axis could be provided...
A consumer orientated simulation of rotary solenoid performance
allows the user to determine what effects non-standard conditions
will have on performance in a contemplated application. Typical
variable conditions are: loads temperature and voltage.
Three differential equations are used to describe the solenoid
operation. Two of these are non-linear, second-order equations...
The detection of limit cycles may be accomplished in several
ways. This thesis presents a numerical method for detection when
the system is described by the Van der Pol equation.
Two numerical integration methods are used to increase the
accuracy of the detection. The concept of a transversal is utilized...
The acceleration in a second-order system is directly controllable
by the input. The Acceleration-Oriented Learning Controller
generates the input to control a second-order system and adjust this
input based on observations of the system's response in order to obtain
a particular acceleration pattern.
Large changes with time and some nonlinearities...
This is a report describing the limitations of optical character
recognition using the mask-matching principle. Conclusions
are supported by the results of an experimental system built for
the purpose of reduction to practice.
Formulas are derived describing the limitations of a mask-matching system. Given desired character reading speed, a specified...
Theoretical bases and techniques are discussed in this
paper for practical numerical analysis and synthesis of linear
feedback control systems. Criterion are based on the superposition
integrals.
A synthesis method is introduced to find the impulse response
of a system or a part of the system. The existing system
can...
The demand for improved controllers creates the need for synthesis techniques which emphasize optimality. Optimality automatically infers stability. This thesis presents one such technique which is not limited to linear systems. The theory of dynamic programming is applied to the synthesis of optimal controllers with emphasis on missile flight control...
The model-reference, adaptive control concept is based on the
precept that desired control system performance is a known design
requirement and can be obtained from a representative model. Control
system parameters are adjusted by the adaptive controller through a
minimizing operation on a function of the error (i.e., performance
index)...
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)...
A technique is presented for obtaining high resolution root locus plots and Bode diagrams. This is done by translating the origin of coordinates to the area of interest by an appropriate change of variable. The method is applicable to hand calculations or use of a potential analog computer. Examples include...
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...
The problem of analyzing the general linear, time-varying
system is investigated. The approach starts with four different
system representations: the differential equation, transform representations,
signal flow graphs, or block diagrams. Given one of
these system describing representations, it is shown what the
engineer can find out about the system and...
The work in this thesis solves the problem of restoring a power
system to its operating stable equilibrium point, following a transient
disturbance, in minimum time without any oscillation. The idealized
power system considered consists of cylindrical rotor generator connected
to an infinite busbar with the following cases of control:...
This work shows how a new design in a load cell can be built
using the principles of photoelasticity. From photoelasticity one
knows that fringes denoting the stress pattern can be observed in a
plastic model viewed in a polariscope. Through knowledge of the
properties of the material one can...
The system of partial differential equations which governs the
motion of a Newtonian fluid has been known for over a century. Yet,
due to the complexity of the equations, an analytical solution is known
only for a few simple geometries or a few special cases such as very
slow motion....
The Mount Jefferson Primitive Area is one of three High Cascade wilderness areas in Oregon. It is second in size among these, covers approximately 136 square miles, and with the addition of a large roadless area in Warm Springs Indian Reservation represents the only one of these areas in Oregon...
A study was undertaken to determine the reliability of the formation
of a line of demarcation between paired cultures of Fomes
cajanderi Karst. as an indicator of dissimilar compatibility genotypes.
The results were applied to an assay of the number and location of
compatibility genotypes in each of four glaze-damaged,...
This study examines the impact of the recently constructed
limited- access highway, Interstate 5, on agricultural land in Linn
County, Oregon. More specifically it scrutinizes the quality and
quantity of the land relinquished to the highway right -of -way; the
effects on field boundaries, connectivity, mobility, drainage, land
use, miscellaneous...
The High Temperature Lattice Test Reactor (HTLTR) at Richland,
Washington, operates at temperatures up to 1000°C. Its low nuclear
power requires a 384 kilowatt electrical heating system, that is
divided into four circuits, to attain the high temperatures in the
ten-foot cube of moderating graphite. This thesis describes the
design...
Calling of captive and free-living band-tailed pigeons (Columba fasciata, Say) was studied between June, 1965, and June, 1967, in western Oregon. Vocalizations of captive band-tails were observed during mornings and afternoons in 1965 and 1966; calling of free-living band-tails was observed in mornings during call-counts and point observations in 1966....
Methods for mathematically modeling digital networks and
for constructing a digital network simulator are presented in this
paper. Two simulator programs have been written in FORTRAN
for the CDC 3300 Computer system: one for analyzing the behavior
of a typical combinational network, and one for analyzing the
behavior of a...
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...
SIDAC-I is a digital analog simulator which permits analog as
well as hybrid simulations to be programmed on a digital computer.
FORTRAN, a scientific computer language, may be included as an
integral part of the SIDAC-I simulation language. The simulator
consists of a controller program and a set of predefined...
A complete procedure of minimizing input logic in designing
both completely and incompletely specified synchronous, finite state
sequential networks is presented in detail. This procedure consists
of three important steps: 1) state simplification, 2) state assignment
and 3) input logic realization. Two new ideas are presented
in the procedure of...
The impact of the electronic computer on the teaching
of mathematics, science, and engineering has created
the need for a relatively low cost instructional digital
computer. SPEDTAC (stored Program Educational Digital
Transistorized Automatic Computer) was designed specifically
to fulfill this need.
The prototype described is a serial, solid state,
single...
This thesis discusses a method of fast multiplication by parallel
addition of summands. A logical element that performs this parallel
addition is defined, and examples of the element realized with threshold
logic are shown. Relations between the type of logical element
used, and the speed and cost of the multiplier...
The design of a preamplifier for use with a piezoelectric transducer is generally approached from the point of view that an extremely high input impedance is required to obtain low frequency response. However, piezoelectric transducers are essentially charge generators and this fact may be utilized in designing preamplifiers to be...
The objectives of the study were (1) to determine the differences
in ability of seniors and freshmen to apply principles learned
in a clothing selection course to selection of clothing, (2) to determine
retention of concepts learned in the course, (3) to determine if
age, grades, social class, and occupational...
A design for an agricultural airplane is developed and evaluated,
A biplane configuration was adopted since it provides better maneuverability
and stall characteristics than a monoplane of comparable
size and design simplicity. The airplane, powered by a 600-horse-power
Pratt Whitney radial engine, was sized to carry a useful
load of...
The objectives undertaken in this study were to investigate the
biologies and potential economic importance of Pseudohylesinus
tsugae Swaine and P. grandis Swaine in young coastal stands of western
hemlock (Tsuga heterophylla (Rafn.) Sarg.).
The life and seasonal histories of P. tsugae and P. grandis and
the association of these...
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...
A mathematical model simulating mass transport of chemicals
in saturated porous medium is given in four parts. Included in the
development is the physical phenomenon of adsorption of molecules
of chemicals on the surrounding walls of the porous medium. The
four main areas of study are:
(1) Simple one dimensional...
Earthworms are capable of osmotic and ionic regulation while
living in a dilute balanced salt solution. When transferred from soil
to pond-water (PW) their body weight increases by 15 percent due to
a net uptake of water.
This results in an initial dilution of the
coelomic fluid (CF).
Subsequently, Na...
The study of highlead logging operations through the use of
statistical models is investigated, and their potential use for estimating
and control of operations examined.
During the preliminary phases of the study 16 work elements
and 26 influencing variables are identified and measurement criteria
developed for each. A coding system...
Studies were initially conducted to determine the action of
intravenous serotonin on perfused segments of human umbilical
cords in vitro. Intravenous serotonin, via bolus injection or
continuous infusion, was found to elevate venous perfusion pressure,
while intra-arterial serotonin failed to alter venous pressure.
Norepinephrine, administered to the venous perfusate, was...
The gills of an Oregon crayfish, Pacifastacus leniusculus Dana,
were examined with histological and histochemical techniques and
their fine structure was investigated by electron microscopy. Special
attention was given to the structural basis of active ion uptake.
The histology of these gills was the same as that of other crayfish...
This study was made to present any evidence as to differences
in the frequency of occurrence of corticolous lichens from east to
west in the Willamette Valley on a bark substrate of Quercus Garryana.
Twenty-four species of lichens were observed to be present
within the grid area of the 100...
This paper makes available practical algorithms and their associated
FORTRAN IV computer programs for finding the roots of
polynomial equations.
The purpose of this paper is to examine effective algorithms
for solving polynomial algebraic equations in one unknown on a digital
computer. The advent of high - speed digital computing...
The epidermis of the brook lamprey, Lampetra planers
(Bloch), has been examined with histological and histochemical
techniques and the fine structure of the fibrillar
club cells has been studied with electron microscopy.
In histological structure the epidermis was found to
correspond to the observations of earlier workers. The
stratified epidermis...
This research was designed to test the applicability of commonly
accepted market structure theory to firm behavior within
agricultural processing industries. The research was primarily
concerned with testing the influence of relative firm size on discretionary
management decisions. Statements from economic theory
concerning structural influences on behavior comprised the hypotheses....
The results of experiments conducted in 1957 and 1958 to
isolate the cause of post-transportation mortalities among hatchery-reared
rainbow trout, Salmo gairdneri Richardson, in Oregon are
reported. Although death rate varies greatly, the average loss
occurring from one to seven days following liberation has been estimated
to be ten percent...
The catabolism of glucose by proliferating and resting cells of
two strains of Saccharomyces cerevisiae has been examined, with
respect to the nature and participation of concurrent glucose pathways
by means of the radiorespirometric method. The nicotinamide
nucleotide content, and nicotinamide nucleotide oxidase activities
in these cells were also examined....
Selection of colored nest boxes by wood ducks (Aix sponsa)
was evaluated during the breeding seasons of 1967-68 in Benton
County, Oregon. No color or site factor influence was observed
in 1967 when nest boxes were erected in sets of eight boxes
served in 1967 when nest boxes were erected...
Fishery researchers have attempted to preserve viable fish sperm for extended periods of time. Only limited success has been achieved with storage of spermatozoa from salmonids. The principal accomplishments of this investigation during the fiscal year 1966-1967 were the development of standard methods for the collection
and evaluation of fish...
This study deals with the patterns of development and distribution
of connective tissue fibers in the placentae and adnexa of the golden
hamster (Mesocricetus auratus Waterhouse). The placentae and
adnexa representing all days of gestation from six to term were
stained for the presence of collagen, reticulin, and elastin. Additionally,...
The object of this study was to investigate the possibilities
of inducing superovulation in the chinchilla (Chinchilla lanigera)
by establishing the optimum dosage of pregnant mares' serum (PMS)
to produce a maximum ovulatory response, and to compare chinchilla
with other animals in this respect. Non-pregnant female chinchillas
were given a...
The patterns of cell proliferation in the choroid plexuses of
embryonic and post-natal hamsters were studied by means of auto-radiography
(H³-thymidine). In addition, the PAS technique was
used to determine the times of first appearance, relative amounts,
location, and times of disappearance of glycogen free the plexuses.
Many mitotic figures...
In the fall and winter of 1965, 1966, and 1967, 298 ratfish (180 males, 118 females) were collected off the Pacific coast of
Oregon and Washington and examined for food habits , parasites, growth relationships and a method of age determination. The following
food organisms were found to be the...
This investigation was designed to study articulation between
Oregon secondary mathematics programs and college mathematics at
Oregon State University. Three main facets of the problem were
studied:
1. The relationship of several factors to the CEEB Level I
Mathematics Achievement Test score.
2. The feasibility of a discriminant function as...
A study of the Pacific coast Band-tailed pigeon (Columbia fasciata Say) was conducted from August 1966 to September 1968. Bands recovered from 14,787 pigeons banded in the Pacific Coast states, 1929-65, were used to determine distribution, migration, and mortality. Data on the age structure of populations were obtained from 3,596...
Numerous fishery researchers have attempted to preserve viable fish sperm, but only three investigations were successful in the fertilization of fresh eggs with frozen and thawed sperm: Blaxter (1953); Hoyle and Idler (1968); and Graybill and Horton (1969). Significant advances reported in this thesis were: the development of suitable life...
This study deals with the autoradiographic analysis, using a
DNA precursor (tritiated thymidine), of the trophoblastic giant cells
in the placentae of the golden hamster (Mesocricetus auratus Waterhouse),
beginning with the sixth day of gestation and extending to term
on day sixteen. Both the percent of labelled cells in the...
Data were gathered on the life history of the pile perch
(Rhacochilus vacca) from Yaquina Bay, Oregon, between April,
1966, and July, 1967. Pile perch feed on the bottom and consume
mostly molluscs, barnacles and decapod crustaceans. Food habits
varied among seasons and locations within the bay, whereas the
diet...
This study deals with the histochemical identification of the
changing patterns of glycogen in the uterus of the early pregnant and
lactating golden hamster (Mesocricetus auratus Waterhouse). The uterus of the hamster representing days one through five of gestation,
and one through ten, twelve, and fourteen of lactation, provided the...
This study deals with the histochemistry of the
changing patterns of glycogen in the uterus and extra-embryonic membranes of the golden hamster (Mesocricetus
auratus Waterhouse). The uterus and extra-embryonic
membranes of the golden hamster representing days of
gestation from six to term were stained with periodic
acid-Schiff and Best's carmine....
An investigation concerning the acceptance of a new, legend drug
product was conducted within a community of 15,000 population.
Twenty-eight physicians within the community were chosen for evaluation
relative to acceptance of the new drug product.
Data were obtained by means of a prescription audit of nine retail
pharmacies in...
In this paper we use the set of all positive integers as a sample space whose probability density function is unknown. Then a generalization of the probability distribution of the most significant digits of the set of all physical constants is obtained on the strength of (i) a very general...
The GALAXY computer is a large, high speed, general
purpose, digital computer intended to be used for solving
scientific problems. It requires a random access memory
system of 16,384 words of 59 bits each with a cycle time
of one microsecond or less. A memory system capable of
meeting these...
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...
This thesis is concerned with the detailed derivation
of Sheppard's Correction Formula relating the true to the
raw moments by the use of Euler-MacLaurin formula. Special
moment relationships have been derived using different
special functions, whose application is made to derive correction
formula for the semi-invariants. Special investigation
is carried...
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...
Three types of magnetic memory elements with emphasis
placed on low cost and batch fabrication are investigated.
The type I element consists of a wired hole in a strip of
Deltamax tape. The type II element uses a stack of magnetic
tape instead of the Deltamax. The type III element...
The performance of certain high-gain amplifiers, such
as those used in null detectors, can be greatly improved
by using a nonlinear element in a feedback loop. With the
addition of nonlinear feedback, it is possible to obtain
an amplifier that can handle a large dynamic range of input
signals without...
A high speed adaptive signal processing concept and several high
speed adaptive logic circuit elements are presented.
The adaptive signal processing system operates in a "goal" oriented
mode; the system tries to optimize its characteristics to
achieve a given goal in spite of unforeseen variations in the inputs,
the system,...
The Euler-MacLaurin sum formula has appeared in the titles
of two quite recent papers whose authors were primarily interested
in certain applications. In this paper a somewhat different approach
to the myriad of formulas for summation, integration, differentiation,
etc. , is based on the simple identity which defines the set...