2,304 research outputs found
The Toda hierarchy and the KdV hierarchy
The Toda hierarchy of size is well known to be analogous to the KdV
hierarchy at goes to infinity. This paper shows that given a periodic
function, there is a canonical way of defining the initial data for the Toda
lattice equations so that the evolution of this data under the Toda lattice
hierarchy looks asymptotically like the evolution of under the KdV
hierarchy. Further, the conserved quantities of and those of the Toda
hierarchy match.Comment: AMSTe
Certificate Feeder Pig Program
The Iowa Certificate feeder pig program is a cooperative venture established in 1978 by the Iowa Veterinary Medical Association and the Iowa Pork Producers Association. The purposes are to 1) establish a set of health guidelines for feeder pigs; 2) identify feeder pig producers meeting or exceeding the guidelines; 3) encourage increased veterinary participation in the development and maintenance of herd health programs; and 4) supply feeder pig finishers with healthy quality pigs and information about he herd of origin, vaccination history, and products used prior to sale
Interpreting the eH Stretching Region, Through Infrared Partial Deuteration Studies
Information derived from a study of \u27isolated\u27 CH stretching
frequencies, measured in partially deuterated organic and organemetallic compounds, is reviewed. This includes CH bond lengths and dissociation energies, and HCH angles in methyl groups, Excellent agreement is found between CH bond length differences predicted from VCH\u27s values and those calculated by ab initio methods. V\u27sCH data also agree with the results of high overtone, local mode studies in distinguishing differences in CH bond strengths. The former however are based on spectra which are easier to assign
to specific bonds. They also enable one to understand the spectra
of normal, undeuterated molecules in the CH stretching region,
through \u27energy factored force field\u27 calculations. Reference is made to situations involvlng free internal rotation of methyl groups, and to studies of other \u27isolated\u27 MH bonds (M = N, Si, Ge, Sn)
ALMA imaging of SDP.81 - I. A pixelated reconstruction of the far-infrared continuum emission
We present a sub-50 pc-scale analysis of the gravitational lens system SDP.81
at redshift 3.042 using Atacama Large Millimetre/submillimetre Array (ALMA)
science verification data. We model both the mass distribution of the
gravitational lensing galaxy and the pixelated surface brightness distribution
of the background source using a novel Bayesian technique that fits the data
directly in visibility space. We find the 1 and 1.3 mm dust emission to be
magnified by a factor of u_tot = 17.6+/-0.4, giving an intrinsic total
star-formation rate of 315+/-60 M_sol/yr and a dust mass of 6.4+/-1.5*10^8
M_sol. The reconstructed dust emission is found to be non-uniform, but composed
of multiple regions that are heated by both diffuse and strongly clumped
star-formation. The highest surface brightness region is a ~1.9*0.7 kpc
disk-like structure, whose small extent is consistent with a potential
size-bias in gravitationally lensed starbursts. Although surrounded by extended
star formation, with a density of 20-30+/-10 M_sol/yr/kpc^2, the disk contains
three compact regions with densities that peak between 120-190+/-20
M_sol/yr/kpc^2. Such star-formation rate densities are below what is expected
for Eddington-limited star-formation by a radiation pressure supported
starburst. There is also a tentative variation in the spectral slope of the
different star-forming regions, which is likely due to a change in the dust
temperature and/or opacity across the source.Comment: MNRAS accepted 2015 April 1
Groundwater Policy in the Western United States
Groundwater mining is inadequately addressed by state and federal policies in the United States. New Mexico\u27s failure to manage groundwater aquifers has resulted in costly federal rescue projects. Better information and involvement of communities in groundwater policy would provide for more sustainable use of this resource
The Iowa and Danish Pork Industries: A Comparison
Iowa produces 29.6 million markets pigs per year, representing 29% of USA swine production. Denmark produces 25.2 million pigs per year and is a major component of the European pork industry and worldwide markets. Both have competitive advantages in a global pork industry. Through available data and personal experience a reflection is made on the similarities and differences between these two distinct pig producing regions
ALMA imaging of SDP.81 - II. A pixelated reconstruction of the CO emission lines
We present a sub-100 pc-scale analysis of the CO molecular gas emission and
kinematics of the gravitational lens system SDP.81 at redshift 3.042 using
Atacama Large Millimetre/submillimetre Array (ALMA) science verification data
and a visibility-plane lens reconstruction technique. We find clear evidence
for an excitation dependent structure in the unlensed molecular gas
distribution, with emission in CO (5-4) being significantly more diffuse and
structured than in CO (8-7). The intrinsic line luminosity ratio is r_8-7/5-4 =
0.30 +/- 0.04, which is consistent with other low-excitation starbursts at z ~
3. An analysis of the velocity fields shows evidence for a star-forming disk
with multiple velocity components that is consistent with a
merger/post-coalescence merger scenario, and a dynamical mass of M(< 1.56 kpc)
= 1.6 +/- 0.6 x 10^10 M_sol . Source reconstructions from ALMA and the Hubble
Space Telescope show that the stellar component is offset from the molecular
gas and dust components. Together with Karl G. Jansky Very Large Array CO (1-0)
data, they provide corroborative evidence for a complex ~2 kpc-scale starburst
that is embedded within a larger ~15 kpc structure.Comment: MNRAS accepted, 6th July 201
Botanicals as part of an integrated value-added pork production system
Some herbs are known to exhibit natural antimicrobial activity and other characteristics that could be useful in value-added animal production. Four botanical products were tested for possible inclusion in swine feeds as alternatives to synthetic chemotherapeutic and antimicrobial agents
Inclusion Body Rhinitis of Swine
Inclusion Body Rhinitis (IBR) is a viral disease of swine characterized by large basophilic intranuclear inclusion bodies in epithelial and reticular cells. It has been found in pigs in North American, Europe, Japan, Australia and Russia since it was first described in England by Done. The causative agent is a member of the herpes family of viruses and is classified as a cytomegalovirus
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