3,214 research outputs found
Calculating Optimum Daily Gain for Wintering Replacement Beef Heifers
Research has demonstrated that weight of the yearling heifer is an important factor affecting puberty and initiation of the reproductive cycle. Work at several institutions including South Dakota State has demonstrated that rate of gain from weaning to start of the breeding season influences the proportion of heifers that settle. The objective of this project was to provide the producer with an easy way of calculating this desired rate of growth
A Novel Use of Light Guides and Wavelength Shifting Plates for the Detection of Scintillation Photons in Large Liquid Argon Detectors
Scintillation light generated as charged particles traverse large liquid
argon detectors adds valuable information to studies of weakly-interacting
particles. This paper uses both laboratory measurements and cosmic ray data
from the Blanche dewar facility at Fermilab to characterize the efficiency of
the photon detector technology developed at Indiana University for the single
phase far detector of DUNE. The efficiency of this technology was found to be
0.48% at the readout end when the detector components were characterized with
laboratory measurements. A second determination of the efficiency using cosmic
ray tracks is in reasonable agreement with the laboratory determination. The
agreement of these two efficiency determinations supports the result that
minimum ionizing muons generate photons/MeV as
they cross the LAr volume.Comment: Accepted version (without final editorial corrections
Comparison of Methods of Producing Slaughter Weight Steers Using Maximum Quantities of Forage and Minimum Quantities of Grain
The objectives of this study were to compare performance and slaughter characteristics of various production systems by which slaughter steers can be produced in the high desert rangeland of eastern Oregon, which is very similar to the semi-arid rangelands of western South Dakota. Economic analysis and taste panel evaluations are also included
Environmental Survival of Mycobacterium avium subsp. paratuberculosis in Different Climatic Zones of Eastern Australia.
The duration of survival of both the S and C strains of Mycobacterium avium subsp. paratuberculosis in feces was quantified in contrasting climatic zones of New South Wales, Australia, and detailed environmental temperature data were collected. Known concentrations of S and C strains in feces placed on soil in polystyrene boxes were exposed to the environment with or without the provision of shade (70%) at Bathurst, Armidale, Condobolin, and Broken Hill, and subsamples taken every 2 weeks were cultured for the presence of M. avium subsp. paratuberculosis. The duration of survival ranged from a minimum of 1 week to a maximum of 16 weeks, and the provision of 70% shade was the most important factor in extending the survival time. The hazard of death for exposed compared to shaded samples was 20 and 9 times higher for the S and C strains, respectively. Site did not affect the survival of the C strain, but for the S strain, the hazard of death was 2.3 times higher at the two arid zone sites (Broken Hill and Condobolin) than at the two temperate zone sites (Bathurst and Armidale). Temperature measurements revealed maximum temperatures exceeding 60°C and large daily temperature ranges at the soil surface, particularly in exposed boxes.This work was supported by the NSW sheep industry through the NSW Ovine Johne's Disease Industry Fund and the NSW Rural Assistance Authority
Dynamically-Coupled Oscillators -- Cooperative Behavior via Dynamical Interaction --
We propose a theoretical framework to study the cooperative behavior of
dynamically coupled oscillators (DCOs) that possess dynamical interactions.
Then, to understand synchronization phenomena in networks of interneurons which
possess inhibitory interactions, we propose a DCO model with dynamics of
interactions that tend to cause 180-degree phase lags. Employing an approach
developed here, we demonstrate that although our model displays synchronization
at high frequencies, it does not exhibit synchronization at low frequencies
because this dynamical interaction does not cause a phase lag sufficiently
large to cancel the effect of the inhibition. We interpret the disappearance of
synchronization in our model with decreasing frequency as describing the
breakdown of synchronization in the interneuron network of the CA1 area below
the critical frequency of 20 Hz.Comment: 10 pages, 3 figure
How strong is the evidence for accelerated expansion?
We test the present expansion of the universe using supernova type Ia data
without making any assumptions about the matter and energy content of the
universe or about the parameterization of the deceleration parameter. We assume
the cosmological principle to apply in a strict sense. The result strongly
depends on the data set, the light-curve fitting method and the calibration of
the absolute magnitude used for the test, indicating strong systematic errors.
Nevertheless, in a spatially flat universe there is at least a 5 sigma evidence
for acceleration which drops to 1.8 sigma in an open universe.Comment: 16 pages, 3 figure
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