Fabricated steel beam specimens with rectangular holes cut in
the webs were subjected to load tests to analyze the behavior of the
modified section. Beam-depth to hole-depth ratio was in all cases
2.0; however, ratio of hole length to hole height varied from 2.0 to
3.0. The primary instrumentation of...
The critical buckling load for round tapered columns with variable
end fixity is presented. The theory used is presented together
with the general solution for the resulting differential equation. This
general solution is solved by use of a computer. The computer program
written specifically for this thesis, the flow chart,...
This paper is a theoretical approach to solve
problems of horizontally curved beams Castiglione's
theorem is applied to solve for the fixed end bending
moments, maximum span moments and fixed end torsional
moments. To calculate the vertical deflection at the midspan
of the curved beam the moment-area method is used....
Development of long-range nuclear weapons in recent years and
the subsequent threat of nuclear war has led to an increased awareness
of the need for civilian protection. Adequate shelter design can
provide substantial protection against delayed radioactive fallout.
Protection can generally be greatly increased by more massive roof
construction to...
A method of analysis of arbitrarily shaped prestressed concrete
members for biaxial bending is given. The stress-strain curve of
the concrete is represented by two parabolic segments, and the
effects of strain hardening of the steel are included in the analysis.
An iterative numerical procedure is used to solve for...
This paper presents an application of the wave equation to the
problem of selecting a driving hammer for prestressed concrete piles.
The potentially damaging effects of these types of hammers on various
prestressed concrete piles were analyzed by means of parametric
studies carried out on a hypothetical group of problems...
Resistance of reinforced concrete beams to diagonal tension
was studied in a series of papers which included beams without
web reinforcement and beams with various types of web reinforcement.
The magnitude of the loading causing the formation of initial
diagonal tension cracks depended primarily on the dimensions of
the cross...
This thesis investigated the methods of failure in the webs of
built up girders. The beams had rectangular holes five and one-half
inches wide and seven and one-half inches high with rounded corners
in a web fourteen inches deep between flanges. The longitudinal
position of the hole edge varied from...
This paper investigates a particular bridge construction technique
which could result in a significant torsional moment. The
structural member under consideration is a prestressed concrete
girder for which no torsional consideration is made.
Torsional shear stresses can be adequately approximated for
an I-shaped girder. Laboratory model tests were performed to...
This paper investigates the proposed preliminary designs of
two gymnasiums with respect to gamma radiation shielding due to
radioactive fallout. For each building a determination is made of
the protection offered from radiation fallout. If the degree of protection
is below the minimum value set by the Office of Civil...
Two built-up wide-flange beams with several large holes in each
beam were tested to failure. Strains were measured by strain gages
at various levels, located at the ends and center of typical holes, and
deflections were measured optically at two points on each beam.
Lateral bracing was provided to prevent...
The past decade of research has potentiated a revolution in our understanding of mammalian health and evolution by revealing that the gut microbiome plays a central role in mammalian physiology. Our ability to unlock this potential hinges upon the identification of specific groups of gut microbes that elicit effects on...
Agricultural and companion animals are integral to our way of life as they provide us with nourishment, financial resources, transportation, and companionship. However, pets, managed animals in the agricultural industry, as well as wild populations of food animals are all subject to health and mortality risks. The gut microbiome is...
Benzo[a]pyrene (B[a]P) is a common environmental pollutant produced from the incomplete combustion of organic matter, such as fossil fuel emissions. In vertebrates, B[a]P exposure is associated with hyperactivity, though the underlying mechanisms driving this effect are undescribed. Mounting evidence indicates that the gut microbiome, which is the diverse community of...
Microscopic organisms inhabit virtually every niche on this planet, where they perform functions vital to all life on earth. Accordingly, humans host a complex community of microorganisms (i.e. the gut microbiome) that inhabit the gastrointestinal tract and modulate host physiology. Insight into the specific mechanisms through which gut microbes influence...
Investigations of 16S rRNA gene sequences hallmark modern microbiology. These sequences provide culture-independent insight into the abundance and distribution of microbiota and serve as a principle resource through which microbial community diversity is measured. Consequently, researchers rely on 16S gene sequences to test hypotheses rooted in ecology, evolution, and disease....
The fungal pathogen Cochliobolus victoriae, the causal agent of Victoria blight, produces a host-selective pathogenicity factor called victorin. In Arabidopsis thaliana, a dominant gene called "supersense" (SSN) confers constitutive victorin sensitivity at very low concentrations. SSN encodes a nucleotide-binding leucine-rich-repeat (NB-LRR) protein. In the SSN-carrying Heiligkreuztal 2 ecotype (TAIR Germplasm...
This study develops a general discrete flow model which is
discrete both in time and space. A stirred tank network model
(continuous time compartment model) is summarized and then compared
with the discrete flow model. Both models make use of a
fractional input matrix with elements representing the fraction of...
The developmental patterns of five fuel resources located within
the state of Wyoming are examined through time and in relation to
several factors external to the location of the fuels. An historic
description and inventory of the five fuels: petroleum; natural gas;
oil shale; coal; uranium are presented. External factors...
The residence time distribution in a tubular flow vessel with
multiple baffles has been investigated. Length of sections between
the baffles, orifice diameter to vessel diameter ratio, and the flow
rates were varied, with the flow always in the laminar regime.
Conductivity measurements, involving tracer impulse response,
were used to...
The Farm Enterprise Committee of the Confederated Tribes of
the Umatilla Indian Reservation requested that an evaluation be made
of the Reservation land resource for the purpose of acquisition by the
Tribe as a part of a study of the feasibility of an expanded farm
enterprise. The Committee's primary goal...
Two new methods for the determination of solids movement in a fluidized bed have been developed and evaluated in this work. The first method used a deflecting plexiglass rod with strain gages attached to the base which is immersed in the bed of fluidized solids. The probe will yield a...
Elutriation of silica sand particles from a 0.9 X 0.9 m cold
fluidized bed was studied. Data were collected for cases with and
without tubes. During experiments the position of the tube bundle
above the distributor plate and the superficial velocity were varied.
Runs were made at velocities of 0.9...
Gas mixing is studied in fluidized beds of large particles. The
bed is 0. 483 m by 0. 127 m (19 in. by 5 in. ) in cross section and has
transparent plexiglass panels on the front and back. A tube matrix
made of twenty-seven 50.8 mm (2 in.) diameter...
Mixing of ferrite tracer with silica sand was studied in a 0.91 m
x 0.91 m cold fluidized bed. Inductance probes located Inside dummy
heat transfer tubes [in a 4 x 4 x 4 array] were used to monitor a
ferrite tracer with physical properties similar to coal as it...
Observation shows that bubbles in large particle fluidized beds
behave quite differently from beds of fine particles. They expand and
can grow faster than they rise. Bubbles in fine particle beds seem to
grow primarily by coalescence, while in large particle beds they are
observed to grow mainly without coalescence....
Experimental infection of mice with Candida albicans leads
to significant suppression of cell mediated immune responses.
We have characterized the nature of this candida-induced
suppression with formalin killed Candida albicans (FKCA) in the
yeast and mycelia' phase. Mice (BALB/c or C57B1/6J) treated
with FKCA exhibited a reduction in the T-cell...
The theoretical analysis of an unseeded, isothermal mixed-suspension
mixed-product-removal (MSMPR) crystallizer with a fines trap is developed.
The lumped parameter system equations are presented for a homogeneous
nucleation and a number-dependent secondary-nucleation model. Linear
stability analysis and system simulations are used to investigate the
system's dynamic behavior.
Modal control algorithms...
Many methods in use today for the isolation, purification, and
identification of the staphylococcal enterotoxins involve lengthy
steps with significant loss of enterotoxin, are subject to interference
from contaminating sample components, and lack sufficient specificity.
Culture extracts of enterotoxin producing Staphylococcus
aureus strains (enterotoxins A-E), crude enterotoxin preparations
(enterotoxins A-E),...
This study investigated the private costs to individual households
of large-lot zoning policies. The study asked whether typical
zoning ordinances create shortages of small lots or small structures
and, if so, what the magnitude of the resultant welfare loss is.
The hypotheses were suggested by a theoretical model developed
to...
Victoria blight of oats is caused by the fungus Cochhobolus victoriae. This fungus is pathogenic due to its ability to produce the host-selective toxin victorin. Previously, a 100-kD protein that binds victorin in vivo only in susceptible genotypes was identified as
the P protein of the glycine decarboxylase complex (GDC)....
Victoria blight of oats (Avena sativa) is caused by the fungus, Cochliobolus victoriae, which produces the toxin, victorin. Victorin production is required for pathogenicity of the fungus. In oats, sensitivity to the toxin and susceptibility to the pathogen is conditioned by a dominant allele at the 1'b locus, while oats...
An attempt is made to determine whether
or not property value appreciation on land adjacent to an
expanding urban center is related to distance from the
city and to identify the temporal variation in this relationship.
The results of simple linear regression strongly
suggest that property value appreciation and distance...
Production of the host selective toxin victorin is causal to pathogenesis of Cochliobolus victoriae on oats. The dominant Vb gene confers oat sensitivity to victorin, and is genetically inseparable from Pc2, which confers resistance to Puccinia coronata f. sp. avena. Victorin induces apoptotic-like cell death, and cell death is a...
The Minerals Yearbook and the Census
of Minerals Industries' statistics lack detail,
completeness, and accuracy concerning stone and
sand and gravel in Oregon and are therefore
deficient in their utility. The lack of detail and
completeness causes extreme difficulty in comparing
varied field-checked statistics. The inaccuracy
of the data concerning...
The differences in the per student cost of education
and the taxes to pay for that education can be attributed,
in part, to the rate of population growth within a school
district. The lowest coats and taxes are found in those
school districts with the fastest growing populations. As
the...
Land value appreciation and its relation to three
interchanges on Interstate 5 were studied. Lots within a
two mile (3.2 km.) radius and in existence in 1965 and 1975
were included. The interchanges were selected on the basis
of form, setting, type of crossroad, and distance from urban
areas. Lots...