A brief history of X-ray control methods is presented, and
the instrumentation requirements and physiological considerations
pertaining to an automatic X-ray control system are discussed.
The latter half of the thesis describes the design and operation
of a device which will permit medical radiographs to be taken
automatically and at...
This study was developed (1) to compare the durability and
comfort of stretch and nonstretch in certain selected denim and
gingham fabrics, (2) to test specific designs as to their self-help
features and (3) to test special features in the designs which might
be adapted easily to ready-made clothing for...
New teaching techniques are the products of a wide
spectrum of research. The final test of all teaching
techniques, however derived, is their application to
a given classroom situation. The purpose of this study
is to determine whether the "principle approach", a
relatively new teaching method in agriculture, has been...
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...
B and C horizon samples from twenty four selected profiles along
a north-south transect in the Willamette Valley were examined for
possible correlation between shrinkage properties and kind of clay
minerals present.
Observations of linear shrinkage, weight loss from a condition
of maximum plasticity, and changing character of X-ray diffraction...
Water and methanol adsorption isotherms at 25° and 37° C.
were determined on a series of organo-bentonite clays. The clays
differed in the length of the carbon chain attached to the amine adsorbed
in the cation exchange position. The amines used had carbon
chains of 4, 6, 8, 10, 12,...
Ten experiments were conducted to determine the vitamin requirements
of coturnix quail (Coturnix coturnix japonica) to 2 weeks
of age using a glucose monohydrate-isolated soybean protein diet.
A preliminary study consisting of 2 separate experiments was
conducted to determine those vitamins essential to the growing
coturnix. This study revealed that...
During construction of the embankment at Blue River Dam
placement difficulties were occasionally experienced with the filter
zone sands. In the extreme condition construction equipment became
mired and part of the fill had to be removed and wasted. A
laboratory investigation was conducted on materials from the above
project to...
The Pacific Coast variety of Douglas-fir was investigated.
The samples were tested using both forced and free vibrations. Transverse
vibrations were introduced by excitations on the side of the
samples. Forced vibrations were applied from 5000 to 0 hertz by a
vibration generator, and free vibrations were initiated by a...
In situ salinity, turbidity and temperature were measured at discrete depths and water samples for radioanalysis were simultaneously collected in the Columbia River Estuary using a specially designed instrument package. Particulate radioactivity was concentrated by filtration and the dissolved radioactivity by evaporation or ferric oxide bulk precipitation. Radioanalysis was by...
The author shows that a necessary and sufficient condition
for a convex polyhedron to be representable as a finite vector sum
of line segments is that each of its faces possesses central symmetry.
The partitioning of body fluids in the Pacific hagfish was investigated
using several experimental techniques. Direct measurement
of the blood volume was obtained through the simultaneous use
of tagged red blood cells and plasma proteins labeled with Evan's
blue dye. Blood cells obtained from donor animals were incubated
with L-methionin-methyl-C¹⁴...
The purpose of this study was to determine the relative resistance
of genetic lines of hops, Humulus lupulus (Linn.) to the
two-spotted spider mite, Tetranychus urticae (Koch) in western
Oregon.
Approximately three-hundred genetic lines of hops were
screened under insectory conditions during the 1965 growing season
at Corvallis, Oregon. Reduction...
This study examines in detail a continuous drop-size distribution
recorder and selected data gathered with this recorder at
various locations on 6, 15, and 31 May 1966. The drop-size distribution
recorder consists of a self-contained, mobile unit able to
operate without electric power. This recorder utilizes "Ozalid 105
SZ" filter...