The use of consumable -electrode arc melting as a production technology
is growing. An advantageous feature of the process is the avoidance of ingot
contamination by soluble crucible materials. This is accomplished by the
expedient of employing a chilled metal crucible. As might be expected, the
thermal balance under these...
We used a dynamic hydrology model to simulate water table depth (WTD) and quantify the relationship
between Saint Louis encephalitis virus (SLEV) transmission and hydrologic conditions in Indian River
County, Florida, from 1986 through 1991, a period with an SLEV epidemic. Virus transmission followed
periods of modeled drought (specifically low...
An ecological study of a microorganism similar to that isolated
in 1956 and designated as Micrococcus radiodurans indicated
that the organism could be isolated from several different environments.
By taking advantage of its radio-resistivity, high levels of
gamma radiation were used in the isolation procedures to inactivate
most of the...
This study examined the abundance, size, growth, and age of advance regeneration
Douglas-fir, beneath an eighty year-old overstory at a single site on plots subjected to different overstory thinning treatments. Treatments consisted of keeping overstory basal area within upper and lower limits for periods of 12-17 years which, depending upon...
The goal of this thesis is to ease the adoption of energy-efficient (EE) building strategies for affordable homes in the United States (US). Low-wage earning households spend nearly three times the proportion of their gross annual income on home energy bills resulting in higher energy burden for them when compared...
The continuous improvement of construction operations requires a systematic approach of monitoring and making appropriate control actions. However, the lack of real-time information hinders this workflow and eventually compromises timely and effective decision-making. Project managers spend a great deal of time and effort to solve problems emerging from lack of...
Highway work zones are extremely dangerous environments due to the presence of workers near high-speed traveling vehicles. This dynamic environment results in a disproportionate number of accidents that cause injury and casualty to both drivers and workers due primarily to vehicular intrusions into work zones. Several emerging work zone intrusion...
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 construction industry is infamously recognized for having jobsites identified as hazardous working environments due to workers-on-foot commonly functioning at dangerous heights and in close proximity to other construction entities, among other reasons. These hazardous operations result in an increased risk of worker injuries and fatalities caused by fall hazards...
Modular construction is increasingly seen as an efficient construction method in terms of time, cost, and energy. The full realization of these advantages partly relies on the efficiency of the production process inside the modular factories, which currently rely on tedious manual monitoring methods or expensive automated techniques. As a...
The two primary considerations for highway work-zones are its effect on commuter mobility and worker safety which are often spoken of together. However, it must be noted that they often conflict with each other. For example, traffic control plans that reduce travel speed in work-zones improve both commuter and worker...
Planning and management methods in construction need to constantly evolve to keep pace with the growing demand and complexity of work in increasingly competitive environments. This need for innovation and process improvement has attracted lean construction philosophy in industry management practice. Lean has been used in the construction industry to...
Rat selenoprotein W (SeW) promoter activity was investigated using different concentrations of cadmium, copper, and zinc. Two fragments (404bp and 1265bp) of the SeW promoter, containing a single metal response element (MRE), were ligated into the multiple cloning site of a pGL3-Basic reporter plasmid. The constructs were transfected into cultured...
The objective of our study was to investigate the effect of selenium on
selenoprotein W. Western blot analysis indicated that selenoprotein W is present in
muscle, brain, testis and spleen of rat tissues. Tissue distribution of selenoprotein W
was not altered in rats fed various selenium levels. Among muscle, brain,...
This bibliography, recording forestry theses produced during 1953-1955, together with a substantial number of additional theses prepared during 1904-1952, is the first supplement to Forestry Theses Accepted by Colleges and Universities in the United States, 1900-1952 published by Oregon State College in 1953. Approximately one-third of the theses here listed...
Statistically-based estimation techniques are presented
in this study. These techniques incorporate structural test
data to improve finite element models used for dynamic
analysis.
Methods are developed to identify optimum values of the
parameters of finite element models describing structures.
The parameters which may be identified are : element area,
mass...
The emergence of the three-input majority gate as a practical element for logical design has demanded a useful method of design using these elements. In order to facilitate the use of this gate, a digital computer program is presented to implement the design procedure. Utilizing the truth table of a...
The concept of combining arithmetic and memory capability on
a single semiconductor chip has become practical from a system's
viewpoint through the decreased cost of semiconductor memories and
high circuit densities achieved through large scale integration. This
paper describes a model for studying the feasibility of such systems.
An arithmetic-memory...
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...
Direct digital control is becoming quite common in the control
of industrial processes. However, due to the relatively high accuracy
of both analog and conventional digital systems for controlling the
speed of a dc motor, there has been a reluctance to try DDC for
this purpose. This thesis describes a...
This paper is the result of extensive experiments, investigating the effect on typical distribution transformers when operated overexcited as much as 117% of their rated voltage.
The interference of sulfide with the colorimetric determination of
nitrite, by the method of Bendschneider and Robinson (1952), can be
eliminated by passing the samples through a cationic exchange resin,
Dowex 50W-X8, in the zinc form. This resin retains sulfide without
affecting nitrite and the technique can be applied to...
Meridional fluxes of silica across the Southern Ocean polar front
are attributed to two different processes which generally act in opposite
directions. Equatorward low frequency fluxes of silica inferred from
ISOS current meter data in the Drake Passage are approximately balanced
by poleward meridional diffusion of silica along surfaces of...
I have developed an analytical method for the determination of
molecular hydrogen in seawater. It is based on the change of hydrogen
concentration in a 30 cc. volume of air as it is equilibrated with a
one-liter sample of seawater. The change in hydrogen concentration in
the air is measured...
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...
In view of recent developments in large-scale, complex digital systems, it is of interest to broaden the study of two-leveled logical systems to the study of three-leveled systems. This paper introduces the ternary logic system and develops a design approach for ternary digital systems that is based on familiar binary...
It is necessary to evaluate and compare the characteristics of
various methods of accessing data-files in order to utilize economically
both the hardware and the software (Space and Time) supported
by the digital on-line system. The purpose of this paper is to
describe and evaluate the structure and use of...
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...
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...
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 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...
Science is involved in many areas of dairying. The 4-H
Dairy Science Project emphasizes the "why's" of dairying. The
information you learn here should help you with other dairy projects.
You will learn some of the "why's" of selection, nutrition, milk
secretion, and reproduction as well as "how to do...
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...
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...
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...
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...
This thesis considers the worst-case design of transistor
circuits for the realization of Majority Logic.
First the meaning of Majority Logic is discussed. The requirement
of an odd number of inputs for the realization of Majority
Logic is justified. The usefulness of Majority Logic in synthesizing
a Boolean expression is...