The sweet potato is one of the world’s most widely consumed crops, yet its evolutionary history is poorly understood. In this paper, we present a comprehensive phylogenetic study of all species closely related to the sweet potato and address several questions pertaining to the sweet potato that remained unanswered. Our...
Micropaleontological data have been analyzed through mathematical
and statistical procedures, in order to: (1) establish the distribution
pattern of radiolarian assemblages in the surface sediments,
(2) establish the relationship of these assemblages with oceanographic
variables, (3) determine the faunal composition down-core with
respect to the faunal surface pattern, and (4)...
The potential impact of projected climate warming on the terrestrial hydrologic cycle is
uncertain. This problem has evaded experimentalists due to the overwhelming challenge of measuring the
entire water budget and introducing experimental warming treatments in open environmental systems. We
present new data from a mesocosm experiment that examined the...
This thesis
is concerned
with the
problems
which
need
consideration
when
designing
a
nanosecond
pulse
generator
having
a
repeatable
pulse
width
and
amplitude
output.
The
basic
circuit
is
first
presented
and
analyzed
and
the
reasons
for
wide
variations
in
pulse
width
with
replacement
of
transistors
are
pointed
out.
To
make...
Thin foil samples of special nuclear materials (SNMs) were irradiated for 60s using a Mark TRIGA II reactor, and their associated gamma emissions were recorded with a count time of 60s following irradiation. A rapid pneumatic transfer system was used to irradiate the samples in front of beam port #4....
The purpose of this study was to explore some of the practices
of home economics teachers in the use of auxiliary personnel as
expressed by city and state supervisors. A second purpose was to
discover the beliefs of city and state supervisors regarding the use
of auxiliary personnel in home...
This report is one of a series issued in cooperation with the ANC-23 Panel on Sandwich Construction for Aircraft of the departments of the Air Force, Navy, and Commerce. Information reviewed and reaffirmed 1965. Original report issued March 1957.
Water circulating through oceanic lithosphere extracts large quantities of heat, affecting magmatic, tectonic, geochemical, and microbial processes. Numerous estimates for the amount of hydrothermal heat extraction have been made on the basis of the difference between the predicted and observed heat flux across the seafloor. These methods have assumed a...
Understory vegetation communities are critical components of forest ecosystems. As a result, the importance of modeling understory vegetation characteristics in forested landscapes has become more apparent. Abundance measures such as shrub cover are bounded between 0 and 1, exhibit heteroscedastic error variance, and are often subject to spatial dependence. These...