1,645 research outputs found
Velocity Curve Analysis of the Spectroscopic Binary Stars V373 Cas, V2388 Oph, V401 Cyg, GM Dra, V523 Cas, AB And, and HD 141929 by Artificial Neural Networks
We used an Artificial Neural Network (ANN) to derive the orbital parameters
of spectroscopic binary stars. Using measured radial velocity data of seven
double-lined spectroscopic binary systems V373 Cas, V2388 Oph, V401 Cyg, GM
Dra, V523 Cas, AB And, and HD 141929, we found corresponding orbital and
spectroscopic elements. Our numerical results are in good agreement with those
obtained by others using more traditional methods.Comment: 13 pages, 8 figures, 14 Table
Application of a New Non-Linear Least Squares Velocity Curve Analysis Technique for Spectroscopic Binary Stars
Using measured radial velocity data of nine double lined spectroscopic binary
systems NSV 223, AB And, V2082 Cyg, HS Her, V918 Her, BV Dra, BW Dra, V2357
Oph, and YZ Cas, we find corresponding orbital and spectroscopic elements via
the method introduced by Karami & Mohebi (2007a) and Karami & Teimoorinia
(2007). Our numerical results are in good agreement with those obtained by
others using more traditional methods.Comment: 6 pages, 3 figures. Accepted for publication in Astrophysics & Space
Scienc
Aplikasi SMS Gateway Quick Count Pemilu Berbasiskan PHP
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Generalized second law of thermodynamics in f(T) gravity
We investigate the validity of the generalized second law (GSL) of
gravitational thermodynamics in the framework of f(T) modified teleparallel
gravity. We consider a spatially flat FRW universe containing only the
pressureless matter. The boundary of the universe is assumed to be enclosed by
the Hubble horizon. For two viable f(T) models containing
and , we first
calculate the effective equation of state and deceleration parameters. Then, we
investigate the null and strong energy conditions and conclude that a sudden
future singularity appears in both models. Furthermore, using a cosmographic
analysis we check the viability of two models. Finally, we examine the validity
of the GSL and find that for both models it is satisfied from the early times
to the present epoch. But in the future, the GSL is violated for the special
ranges of the torsion scalar T.Comment: 16 pages, 10 figures, accepted by JCAP 201
Growth factor in f(T) gravity
We derive the evolution equation of growth factor for the matter over-dense
perturbation in gravity. For instance, we investigate its behavior in
power law model at small redshift and compare it to the prediction of
CDM and dark energy with the same equation of state in the framework
of Einstein general relativity. We find that the perturbation in gravity
grows slower than that in Einstein general relativity if \p f/\p T>0 due to
the effectively weakened gravity.Comment: 15 pages,1 figure; v2,typos corrected; v3, discussions added,
accepted by JCA
External Genitalia Trauma Following the First Manic Episode in an Elderly Woman With Sexual Disinhibition
Introduction: Late onset bipolar disorder is not common. In addition, bipolar disorder with a dominancy over sexual behaviors is very rare. Hence, traumatic and vigorous sexual behavior, such as masturbation and self-mutilation, are odd and rare occurrences.
Case Presentation: An elderly woman in a manic phase of bipolar disorder without a previous history of psychiatric disorders was concomitant with problematic sexual over stimulation in the context of hyper sexuality. She had traumatized her genitals and underwent surgery for their repair. Following her admission and psychopharmacologic therapy, she recovered.
Conclusions: The presentation of bipolar disorder in the elderly can be seen in sexual behaviors and self-mutilation that can lead to the need for reparative surgery. In each case with trauma to the external genitalia, psychiatric problems should be considered
Benthos density and its relationship with sediment condition in the north coast of Gorgan Bay, Golestan Province
The frequency and distribution of benthos species in the north coast of Gorgan Bay (proposed site for cage and pen culture) were studied. Sampling was carried out in three water depths 1, 2 and 3 meters and 10 stations in each depth using Van Veen sampler with 3 replications. Totally, 12 families were identified: Nereidae, Ampharitidae, Spionidae Amphipodae, Osteracodae, Mytilidae, Dreissenidae, Cardidae, Neritidae, Pyrgulidae, .Lithoglyphidae and Planorbidae of which Osteracodae and Ampharitidae with 26% and 1% had maximum and minimum abundance, respectively in all depths. The maximum and minimum abundance of benthos was 6025 per square meter in waters 3 meters deep and 52 per square meter in waters 1 meter deep. In addition, sediment texture and total organic matter (TOM) were analyzed which showed that 2 and 3 meter deep waters had the maximum percent of T.O.M (7.8%) in spring and autumn while the minimum T.O.M (2.5%) in 1 meter deep waters was observed in winter
Interacting viscous ghost tachyon, K-essence and dilaton scalar field models of dark energy
We study the correspondence between the interacting viscous ghost dark energy
model with the tachyon, K-essence and dilaton scalar field models in the
framework of Einstein gravity. We consider a spatially non-flat FRW universe
filled with interacting viscous ghost dark energy and dark matter. We
reconstruct both the dynamics and potential of these scalar field models
according to the evolutionary behavior of the interacting viscous ghost dark
energy model, which can describe the accelerated expansion of the universe. Our
numerical results show that the interaction and viscosity have opposite effects
on the evolutionary properties of the ghost scalar filed models.Comment: 16 pages, 17 figure
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