5,589 research outputs found
Innermost Stable Circular Orbits and Epicyclic Frequencies Around a Magnetized Neutron Star
A full-relativistic approach is used to compute the radius of the innermost
stable circular orbit (ISCO), the Keplerian, frame-dragging, precession and
oscillation frequencies of the radial and vertical motions of neutral test
particles orbiting the equatorial plane of a magnetized neutron star. The
space-time around the star is modelled by the six parametric solution derived
by Pachon et al. It is shown that the inclusion of an intense magnetic field,
such as the one of a neutron star, have non-negligible effects on the above
physical quantities, and therefore, its inclusion is necessary in order to
obtain a more accurate and realistic description of the physical processes
occurring in the neighbourhood of this kind of objects such as the dynamics of
accretion disk. The results discussed here also suggest that the consideration
of strong magnetic fields may introduce non-negligible corrections in, e.g.,
the relativistic precession model and therefore on the predictions made on the
mass of neutron stars.Comment: LaTeX file, 13 pages, 4 figure
Nongauge bright soliton of the nonlinear Schrodinger (NLS) equation and a family of generalized NLS equations
We present an approach to the bright soliton solution of the NLS equation
from the standpoint of introducing a constant potential term in the equation.
We discuss a `nongauge' bright soliton for which both the envelope and the
phase depend only on the traveling variable. We also construct a family of
generalized NLS equations with solitonic sech^p solutions in the traveling
variable and find an exact equivalence with other nonlinear equations, such as
the Korteveg-de Vries and Benjamin-Bona-Mahony equations when p=2Comment: ~4 pages, 3 figures, 16 references, published versio
Evaluation of Secondary and Micronutrients for Soybean Production in Kansas
Study of secondary and micronutrients is growing because of their potential contribution to yield increases. The objective of this study was to evaluate soybean response to secondary and micronutrient fertilizer application to maximize yields. A randomized complete block design was employed with four replications at five locations during 2013 and five locations in 2014. Treatments consisted of an unfertilized control; micronutrient fertilizer as individual nutrients for boron, copper, manganese, sulfur, and zinc; and a mix of these nutrients using two different placements (dry broadcast and liquid band). Soil samples were collected prior to planting and after harvest. Soybean trifoliates were collected at R2–R3 growth stage and analyzed for the micronutrients evaluated in this study. At harvest, nutrient concentration was analyzed in the seed, and yield was calculated at 13% moisture. No significant difference was found in yields between treatments by location or across locations. Results from tissue and grain analysis showed significant treatment effects on zinc concentrations across locations
Model-independent bounds probing on the electromagnetic dipole moments of the -lepton at the CLIC
We establish model independent bounds on the anomalous magnetic and electric
dipole moments of the tau-lepton using the two-photon processes and . We use of data
collected with the future linear collider such as the CLIC at
and we consider systematic
uncertainties of . Precise bounds at
C. L. on the anomalous dipole moments to the tau-lepton and
are set from our study. Our results show that the processes under consideration
are a very good prospect for probing the dipole moments of the tau-lepton at
the future linear collider at the mode.Comment: 38 pages, 26 figure
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