572 research outputs found
A New Diagnostic of Dark Energy in General Relativity Theory
In this paper, we propose a new parametrization of dark energy based on the
diagnostic tool behavior. For this purpose, we investigate a functional
form of the that predicts the popular dark energy dynamical models,
namely phantom and quintessence. We also found the famous cosmological constant
for specified values of the model's parameters. We employed the Markov Chain
Monte Carlo approach to constrain the cosmological model using Hubble, Pantheon
samples, and BAO datasets. Finally, we used observational constraints to
investigate the characteristics of dark energy evolution and compare our
findings to cosmological predictions.Comment: The European Physical Journal C accepted versio
A new cosmological model with quadratic expansion
We present a new cosmological model capable of reproducing late-time
acceleration, i.e. by supporting certain parametrization of the Hubble parameter. By using
observational data from Hubble, Pantheon, and Baryonic Acoustic Oscillations
(BAO) dataset, we investigate the constraints on the proposed quadratic Hubble
parameter . This proposal caused the Universe to transition from its
decelerated phase to its accelerated phase. Further, the current constrained
value of the deceleration parameter from the combined Hubble+Pantheon+BAO
dataset is , which indicates that the Universe is
accelerating. We also analyze the evolution of energy density, pressure, and
EoS parameters to infer the Universe's accelerating behavior. Finally, we use a
stability analysis with linear perturbations to assure the model's stability.Comment: Physics of the Dark Universe published versio
Traditional handloom practices of Nyishi tribe of Arunachal Pradesh, Eastern Himalaya
442-449The documentation of traditional handloom practices of Nyishi tribe and their cultural attire was done in Papum pare district of Arunachal Pradesh wherein 7 selected villages were surveyed during May 2018 to February 2019 through random sampling with semi-structured questionnaire. Rubung Ruekio, a traditional loin loom of Nyishi tribe is prepared from locally available resources, viz., Bambusa. tulda, B. pallida, Dendrocalamus hamiltonii, Gmelina arborea, Michelia species and Terminalia myriocarpa. Most of the weavers were female and weaved culturally important traditional dresses such as Pomo gale, Dumping gale, Jekum/Name-acham gale, Jinjab gale, Juhu/Junghang gale and Luch/lungch gale which are worn especially during auspicious occasions. Of these, Jekum gale, Pomo gale and Dumping gale culturally significant. The market price of gale varied tremendously depending on type of raw material and type of handloom used in the production
Traditional handloom practices of Nyishi tribe of Arunachal Pradesh, Eastern Himalaya
The documentation of traditional handloom practices of Nyishi tribe and their cultural attire was done in Papum pare district of Arunachal Pradesh wherein 7 selected villages were surveyed during May 2018 to February 2019 through random sampling with semi-structured questionnaire. Rubung Ruekio, a traditional loin loom of Nyishi tribe is prepared from locally available resources, viz., Bambusa. tulda, B. pallida, Dendrocalamus hamiltonii, Gmelina arborea, Michelia species and Terminalia myriocarpa. Most of the weavers were female and weaved culturally important traditional dresses such as Pomo gale, Dumping gale, Jekum/Name-acham gale, Jinjab gale, Juhu/Junghang gale and Luch/lungch gale which are worn especially during auspicious occasions. Of these, Jekum gale, Pomo gale and Dumping gale culturally significant. The market price of gale varied tremendously depending on type of raw material and type of handloom used in the production
Rediscovery of Impatiens khasiana Hook.f. after more than a century
Impatiens khasiana Hook.f. (Balsaminaceae) has been rediscovered after a period of 129 years from Meghalaya, in north-eastern India.
A detailed description from living specimens, coloured photographs and other relevant information are provided for easy identification. The name I. khasiana Hook.f. is here lectotypified
Attenuation of coda waves in the Northeastern Region of India
Coda wave attenuation quality factor
Qc is estimated in the northeastern region of India
using 45 local earthquakes recorded by regional
seismic network. The quality factor Qc was estimated
using the single backscattering model modified
by Sato (J Phys Earth 25:27–41, 1977), in
the frequency range 1–18 Hz. The attenuation and
frequency dependence for different paths and the
correlation of the results with geotectonics of the
region are described in this paper. A total of 3,890
Qc measurements covering 187 varying paths are
made for different lapse time window of 20, 30, 40,
50, 60, 70, 80, and 90 s in coda wave. The magnitudes
of the analyzed events range from 1.2 to 3.9
and focal depths range between 7 and 38 km. The
source–receiver distances of the selected events
range between 16 and 270 km. For 30-s duration,
the mean values of the estimated Qc vary from
50 ± 12 (at 1 Hz) to 2,078 ± 211(at 18 Hz) for the Arunachal Himalaya, 49 ± 14 (at 1 Hz) to
2,466 ± 197 (at 18 Hz) for the Indo-Burman, and
45 ± 13 (at 1 Hz) to 2,069 ± 198 (at 18 Hz) for
Shillong group of earthquakes. It is observed
that Qc increases with frequency portraying
an average attenuation relation Qc = 52.315 ±
1.07 f (1.32±0.036) for the region. Moreover, the pattern
of Qc−1 with frequency is analogous to the
estimates obtained in other tectonic areas in the
world, except with the observation that the Qc−1
is much higher at 1Hz for the northeastern region.
The Qc−1 is about 10−1.8 at 1 Hz and decreases to
about 10−3.6 at 18 Hz indicating clear frequency
dependence. Pertaining to the spatial distribution
of Qc values, Mikir Hills and western part
of Shillong Plateau are characterized by lower
attenuation
Attenuation of coda waves in the Northeastern Region of India
Coda wave attenuation quality factor
Qc is estimated in the northeastern region of India
using 45 local earthquakes recorded by regional
seismic network. The quality factor Qc was estimated
using the single backscattering model modified
by Sato (J Phys Earth 25:27–41, 1977), in
the frequency range 1–18 Hz. The attenuation and
frequency dependence for different paths and the
correlation of the results with geotectonics of the
region are described in this paper. A total of 3,890
Qc measurements covering 187 varying paths are
made for different lapse time window of 20, 30, 40,
50, 60, 70, 80, and 90 s in coda wave. The magnitudes
of the analyzed events range from 1.2 to 3.9
and focal depths range between 7 and 38 km. The
source–receiver distances of the selected events
range between 16 and 270 km. For 30-s duration,
the mean values of the estimated Qc vary from
50 ± 12 (at 1 Hz) to 2,078 ± 211(at 18 Hz) for the Arunachal Himalaya, 49 ± 14 (at 1 Hz) to
2,466 ± 197 (at 18 Hz) for the Indo-Burman, and
45 ± 13 (at 1 Hz) to 2,069 ± 198 (at 18 Hz) for
Shillong group of earthquakes. It is observed
that Qc increases with frequency portraying
an average attenuation relation Qc = 52.315 ±
1.07 f (1.32±0.036) for the region. Moreover, the pattern
of Qc−1 with frequency is analogous to the
estimates obtained in other tectonic areas in the
world, except with the observation that the Qc−1
is much higher at 1Hz for the northeastern region.
The Qc−1 is about 10−1.8 at 1 Hz and decreases to
about 10−3.6 at 18 Hz indicating clear frequency
dependence. Pertaining to the spatial distribution
of Qc values, Mikir Hills and western part
of Shillong Plateau are characterized by lower
attenuation
Porcine pancreas lipase catalysed synthesis of lauryl laurate in organic solvent media : a kinetic study
192-197The esterification of lauric acid with lauryl alcohol was studied using lipase from Porcine pancreas, with particular
emphasis on the effect of the pertinent variables and kinetic aspects of the reaction. The reaction was studied in eight
different solvents having hydrophobicity (the logarithm of octanol-water partition coefficient, log P) values ranging from
0.6 to 3.5 with constant water content in the reaction mixture and n-hexane was the most suitable solvent. The initial rates of
the reaction were attempted to correlate with solvent properties and a significant good correlation was obtained with solvent
hydrophobicity (log P) and water solubility (log Sw). The kinetics of the esterification reaction conformed to the so-called
Ping-Pong Bi-Bi mechanism with alcohol inhibition
Esterification of lauric acid with lauryl alcohol using cross-linked enzyme crystals: Solvent effect and kinetic study
In this paper, we report a comprehensive kinetic study on esterification of lauric acid with lauryl alcohol catalyzed by
commercial porcine pancreatic lipase (PPL) in the form of cross-linked enzyme crystals (CLEC) using glutaraldehyde as
thecrosslinker.ThestabilityoftheCLECwasbetter thantheimmobilized enzymefor practicalapplications.Comparative
studies using six different solvents having hydrophobicity (log p) values ranging from 0.70 to 3.50 revealed that the
esterification reaction was favoured in hydrophobic solvents. The kinetics of the esterification reaction conformed with
the so-called Ping-PongBi-Bi mechanism with alcohol inhibition
- …