12,911 research outputs found
On subspaces of pseudo-radial spaces
summary:It is proved that, under the Martin's Axiom, every -space with countable tightness is a subspace of some pseudo-radial space. We also give several characterizations of subspaces of pseudo-radial spaces and conclude that being a subspace of a pseudo-radial space is a local property
A Multicolour Photometric Study of the neglected eclipsing binary FT Ursae Majoris
The multicolour photometric observations of the neglected eclipsing binary FT
Ursae Majoris (FT UMa) were obtained in 2010. The 2003 version of
Wilson-Devinney code was used to analyze the light curves in , , and
bands simultaneously. Based on the spectroscopic mass ratio published
by Pribulla et al., it is found that FT UMa is an evolved contact binary with a
contact degree of 15.3%. The low amplitude of light variations,
mag, arises mainly from a moderately low inclination angle of
and almost identical components in size rather than the light dilution of a
third component, which contributes light of only Comment: 5 pages, 2 figure
Giant mesoscopic spin Hall effect on surface of topological insulator
We study mesoscopic spin Hall effect on the surface of topological insulator
with a step-function potential. The giant spin polarization induced by a
transverse electric current is derived analytically by using McMillan method in
the ballistic transport limit, which oscillates across the potential boundary
with no confinement from the potential barrier due to the Klein paradox, and
should be observable in spin resolved scanning tunneling microscope.Comment: 5 pages, 3 figure
Identification of a New -ray-emitting narrow-line Seyfert 1 Galaxy, at Redshift
We report on the identification of a new -ray-emitting narrow-line
Seyfert 1 (NLS1) galaxy, SDSS J122222.55+041315.7, which increases the number
of known objects of this remarkable but rare type of active galactic nuclei
(AGN) to seven. Its optical spectrum, obtained in the Sloan Digital Sky
Survey-Baryon Oscillation Spectroscopic Survey, reveals a broad H
emission line with a width (FWHM) of 1734104 km s. This, along with
strong optical Fe II multiplets [] and a weak [O III] emission line, makes the object a typical NLS1. On the other hand, the
source exhibits a high radio brightness temperature, rapid infrared
variability, and a flat X-ray spectrum extending up to 200 keV. It is
associated with a luminous -ray source detected significantly with {\it
Fermi}/LAT. Correlated variability with other wavebands has not yet been
tested. The spectral energy distribution can be well modelled by a one-zone
leptonic jet model. This new member is by far the most distant
-ray-emitting NLS1, at a redshift of .Comment: 5 pages, published on MNRA
Multiplexing of fiber-optic white light interferometric sensors using a ring resonator
Author name used in this publication: M. S. Demokan2002-2003 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
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