45 research outputs found
Performance Analysis of Manet Using ODMR Protocol Through Simulation
The fast innovation improvement in the transportation framework is critically required today alongside expanding number of vehicles .Mobile Ad-Hoc Network (MANET) has turned into a dynamic zone of research, institutionalization, and advancement since it can possibly enhance vehicle and street security, movement productivity. Late research endeavors have put a solid accentuation on novel MANET plan structures and executions to enabling technologies that provide a wide variety of services such as vehicle road safety, enhancing traffic efficiency, reducing the level of accident and road congestion. A great deal of MANET examine works have concentrated on particular territories including steering, broadcasting, Quality of service (QoS). In this paper, demonstrate how MANET could be simulated on MATLAB software using different protocol and parameters, and then measure the simulation performance namely time, no of source, destination, protocol, data length or data join request, hops or switch and packet drop between vehicles. Full reach ability between vehicles has been performed between the Vehicle to vehicle and vehicle to Infrastructure or V to RSU
Evolution and Final Fates of a Rotating 25 M Pop III star
In this proceeding, we present the 1-dimensional stellar evolution of two
rotating population III (Pop III) star models, each having a mass of 25
M at the zero-age main-sequence (ZAMS). The slowly rotating model has
an initial angular rotational velocity of 10 per cent of the critical angular
rotational velocity. In contrast, the rapidly rotating model has an initial
angular rotational velocity of 70 per cent of the critical angular rotational
velocity. As an effect of rotationally enhanced mixing, we find that the
rapidly rotating model suffers an enormous mass loss due to the deposition of a
significant amount of CNO elements toward the surface after the main-sequence
phase. We also display the simulated light curves as these models explode into
core-collapse supernovae (CCSNe).Comment: Resubmitted after incorporating minor revision, Part of 3 BINA
conference proceeding
Combining ability and heterosis analysis for fibre yield and quality parameters in roselle (Hibiscus sabdariffa L.)
Roselle (Hibiscus sabdariffa L.) is second important bast fibre crop after jute in India. With an aim to ex-ploit non-additive genetic variance present experiment was designed to identify good general combining parents and specific cross combination for fibre yield and fibre quality parameters (fibre fineness, fibre tenacity) in roselle. A total of 11 parents were crossed in complete diallel fashion which resulted 55 F1, 55 RF1 (reciprocal F1). Parents, F1s and RF1s were grown in randomized block design. Analysis of variance revealed significant differences (P< 0.01, P<0.05) among the parents and their hybrids. The parents AMV 1, AMV 5, GR 27 and AHS 160 were identified as good combiners since they recorded significant general combining ability (GCA) effects for fibre yield and quality parameters. Further, For fibre yield only three crosses (AMV 1 × AMV 4, AMV 1 × GR 27, HS 4288 × JRR 07) showed significant specific combining ability (SCA) effects from them hybrid AMV 1 × GR 27 (fibre yield=27.37g/ plant) exhibited positively significant best parent (Non bris 4, Mean fibre yield=21.16g/plant) heterosis (29.35%). Similarly, for fibre tenacity, hybrid GR 27 × JRR 07 (fibre tenacity=23.47g/tex) exhibited positively significant best parent (HS 4288; fibre tenacity=20.35g/tex) heterosis (15.30%)
SN 2010kd: Photometric and Spectroscopic Analysis of a Slow-decaying Superluminous Supernova
This paper presents data and analysis of SN 2010kd, a low-redshift (z = 0.101) H-deficient superluminous supernova (SLSN), based on ultraviolet/optical photometry and optical spectroscopy spanning between curve comparison of SN 2010kd with a subset of well-studied SLSNe I at comparable redshifts indicates that it is a slow-decaying PTF12dam-like SLSN. Analytical light-curve modeling using the Minim code suggests that the bolometric light curve of SN 2010kd favors circumstellar matter phase spectra does not identify broad H or He lines, whereas the photospheric-phase spectra are dominated by O I, O II, C II, C IV, and Si II, in particular the presence of both low- and high-velocity components of O II and Si II lines. The nebular-phase spectra of SN 2010kd are dominated by O I and Ca II emission lines similar to those seen in other SLSNe I. The line velocities in SN 2010kd exhibit flatter evolution curves similar to SN 2015bn but with comparatively higher values. SN 2010kd shows a higher single-zone local thermodynamic equilibrium temperature in comparison to PTF12dam and SN 2015bn, and it has an upper O I ejected mass limit of ∼10 M☉. The host of SN 2010kd is a dwarf galaxy with a high star formation rate (∼0.18 ± 0.04 M☉ yr-1) and extreme emission lines
Analytical Modelling of Thirty Meter Telescope Optics Polarization
The polarization introduced due to Thirty Meter Telescope (TMT) optics is calculated using an analytical model. Mueller matrices are also generated for each optical element using Zemax, based on which the instrumental polarization due to the entire system at the focal plane is estimated and compared with the analytical model. This study is significant in the estimation of the telescope sensitivity and also has great implications for future instruments
Light Curve and Spectral Evolution of Type IIb Supernovae
Stripped-Envelope Supernovae constitute the sub-class of core-collapse supernovae that strip off their outer hydrogen envelope due to high stellar winds or due to interaction with a binary companion where mass transfer occurs as a result of Roche lobe overflow. We present here the photometric and spectroscopic analysis of a member of this class : SN 2015as classified as a type IIb supernova. Light curve features are similar to those of SN 2011fu while spectroscopic features are quite similar to those of SN 2008ax and SN 2011dh. Early epoch spectra have been modelled with SYN++ which indicates a photospheric velocity of 8500 km sec-1 and temperature of 6500K. Spectroscopic lines show transitioning from H to He features confirming it to be a type IIb supernova. Prominent oxygen and calcium emission features are indicative of the asymmetry of the ejecta. We also estimate the signal to noise ratio of the 3.6m telescope data. This telescope is located at ARIES, Devasthal, Nainital at an altitude of 2450m. We also show the comparison plots of spectra taken with a 2m and 4m class telescopes to enlighten the importance of spectral features displayed by bigger diameter telescopes
Photometric and spectroscopic evolution of the peculiar Type IIn SN 2012ab
We present an extensive ( 1200 d) photometric and spectroscopic
monitoring of the Type IIn supernova (SN) 2012ab. After a rapid initial rise
leading to a bright maximum (M = 19.39 mag), the light curves show a
plateau lasting about 2 months followed by a steep decline up to about 100 d.
Only in the band the decline is constant in the same interval. At later
phases, the light curves remain flatter than the Co decline suggesting
the increasing contribution of the interaction between SN ejecta with
circumstellar material (CSM). Although heavily contaminated by emission lines
of the host galaxy, the early spectral sequence (until 32 d) shows persistent
narrow emissions, indicative of slow unshocked CSM, and the emergence of broad
Balmer lines of hydrogen with P-Cygni profiles over a blue continuum, arising
from a fast expanding SN ejecta. From about 2 months to 1200 d, the
P-Cygni profiles are overcome by intermediate width emissions (FWHM
\kms), produced in the shocked region due to interaction. On the red wing a red
bump appears after 76 d, likely a signature of the onset of interaction of the
receding ejecta with the CSM. The presence of fast material both approaching
and then receding is suggestive that we are observing the SN along the axis of
a jet-like ejection in a cavity devoid of or uninterrupted by CSM in the
innermost regions.Comment: 8 Tables, 17 Figures. Accepted for publication in MNRA
Cosmological Distance Measurement of 12 Nearby Supernovae IIP with ROTSE-IIIB
We present cosmological analysis of 12 nearby () Type IIP supernovae
(SNe IIP) observed with the ROTSE-IIIb telescope. To achieve precise
photometry, we present a new image differencing technique that is implemented
for the first time on the ROTSE SN photometry pipeline. With this method, we
find up to a 20\% increase in the detection efficiency and significant
reduction in residual RMS scatter of the SN lightcurves when compared to the
previous pipeline performance. We use the published optical spectra and
broadband photometry of well studied SNe IIP to establish temporal models for
ejecta velocity and photospheric temperature evolution for our SNe IIP
population. This study yields measurements that are competitive to other
methods even when the data are limited to a single epoch during the
photospheric phase of SNe IIP. Using the fully reduced ROTSE photometry and
optical spectra, we apply these models to the respective photometric epochs for
each SN in the ROTSE IIP sample. This facilitates the use of the Expanding
Photosphere Method (EPM) to obtain distance estimates to their respective host
galaxies. We then perform cosmological parameter fitting using these EPM
distances from which we measure the Hubble constant to be
, which is consistent with the
standard model values derived using other independent techniques.Comment: 19 pages, 13 figure