A liquid-extraction procedure for the concentration of zinc in
sea water was developed. The metal ion in sea water was chelated
with sodium diethyldithiocarbamate and extracted into an organic
solvent, methylisobutylketone, at the normal pH of sea water. A
back-extraction into HCl followed, providing a concentration of 30X
for the...
An algorithm is described for determining the vertices
and supporting planes (or lines) of the convex hull
of a given set of N distinct points in 3-space. The
method involves determining a finite sequence of convex
hulls, each successive convex hull being a better approximation
to the convex hull of...
The major purpose of this study was to determine if there was
relationship between the power of the influence techniques used by
teacher in a nursery school setting and the response of the children
to these techniques.
The subjects were sixteen nursery school children and two
trained nursery school teachers...
This investigation was undertaken to develop a procedure
by which the fatty acids could be separated from the
hydroxy fatty acids of bark waxes. The specific hexane-insoluble, benzene-soluble wax used in this research was obtained
from the bark of white fir, Abias concolor, (Lindl.
and Gord.).
The acids were removed...
The purpose of this study was to compare the quality of data
obtained from individual oral and group written administration of a
classroom simulation test. The individual oral procedure involved
one group of subjects taking the simulator test individually and responding
orally, while the group written procedure involved another
group...
Field biology studies of three grain aphids, Macrosiphum
avenae (Fabr.), Acyrthosiphon dirhodum (Walker), and Rhopalosiphum
padi (L.) were conducted near Corvallis, Oregon, from 1961 to
1964.
Populations of M. avenae were found on grain plants, and
alatae entering spring barley may have been from wheat fields. Specimens
were found more...
Chironomidae occurring in stabilization lagoons were studied
from 1964 to 1966 in Oregon. Observations of other insects and
their impact on the lagoon environment are included. Quantitative
data were obtained from two lagoons near Corvallis and qualitative
observations from preliminary work on two other lagoons are reported.
The objectives of...