1,040 research outputs found
Selected properties of optical spatial solitons in photorefractive media and their important applications
Some selected important properties of photorefractive spatial solitons and
their applications have been reviewed in the present paper. Using band
transport model, the governing principle of photorefractive nonlinearity has
been addressed and nonlinear dynamical equations of spatial solitons owing to
this nonlinearity have been discussed. Mechanisms of formation of screening and
photovoltaic solitons of three different configurations i.e., bright, dark and
grey varieties have been examined. Incoherently coupled vector solitons due to
single and two-photon photorefractive phenomena have been highlighted.
Modulation instability, which is precursor to soliton formation has been also
discused briefly. Finally possible applications of photorefractive spatial
solitons have been highlighted.Comment: 17 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1209.221
Interconnection of islanded DC microgrids
In this paper, the interconnection of islanded DC microgrids are discussed. The interconnection increases the power supply reliability since a power shortfall in one of the microgrids can be supplied by the others. The islanded DC microgrids are interconnected through a bi-directional DC-DC converter. A high frequency transformer isolation is used in the converter. For interconnecting more than two microgrids, a multiple winding transformer is used. The interconnected system is studied for both equal and unequal capacity DC microgrids. A detail description of the interconnection technique is provided with simulation results and illustrations
A multifrequency study of the large radio galaxies 3C46 and 3C452
We present low-frequency observations starting from ~150 MHz with the Giant
Metrewave Radio Telescope (GMRT), and high-frequency observations with the Very
Large Array (VLA) of two large radio galaxies 3C46 and 3C452. These
observations were made with the objectives of estimating their spectral ages
and examining any evidence of diffuse extended emission at low radio
frequencies due to an earlier cycle of activity. While no evidence of extended
emission due to an earlier cycle of activity has been found, the spectral ages
have been estimated to be ~15 and 27 Myr for the oldest relativistic plasma
seen in the regions close to the cores for 3C46 and 3C452 respectively. The
spectra in the vicinity of the hotspots are consistent with a straight spectrum
with injection spectral indices of ~1.0 and 0.78 respectively, somewhat steeper
than theoretical expectations.Comment: Accepted for publication in MNRAS, 10 pages, 8 figures and 4 table
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