124 research outputs found
Blockchain and its Application
In this research investigation into Blockchain Technology, its current use and other pos-sible implementation of this protocol are explored. Blockchain offers opportunities for developing advanced digital services. While current research on this becoming the most important issue which must be well addressed. As part of the fourth industrial revolution since the invention of the steam engine, electricity, information technology, Blockchain Technology has been applied in many areas such as finance, judiciary, and commerce. In this current paper, we focused on its potential Voting Application and explore how Blockchain Technology can be used to solve Health Care Issues, Land Registry, Any Fi-nancial Sector, etc. Some innovative applications of using blockchain technology for different sectors we also discussed
Chandra Detection of Highest Redshift (z~6) Quasars in X-rays
We report on Chandra observations of three quasars SDSSP J083643+005453,
SDSSP J103027+052455, and SDSSP J130608+035626 at redshifts 5.82, 6.28 and 5.99
respectively. All the three sources are clearly detected in the X-ray band, up
to rest frame energies of ~55 keV. These observations demonstrate the
unprecedented sensitivity of Chandra to detect faint sources in relatively
short exposure times (5.7--8.2 ksec). The broad band X-ray properties of these
highest redshift quasars do not appear to be any different from their lower
redshift cousins. Spectra of the sources could not be determined with only few
counts detected. Observations with XMM-Newton will be able to constrain the
spectral shapes, if they are simple. Determination of complex spectra in a
reasonable amount of time, however, will have to await next generation of X-ray
missions.Comment: Submitted to ApJ Letter
Evaluation of effect of aqueous extract of leaves of Calotropis procera in pentylenetetrazole induced seizures in rats
Background: The study was carried out to evaluate the effect of aqueous extract of leaves of Calotropis procera in wistar rats.Methods: An aqueous extract of leaves of Calotropis procera was prepared. The effect of acute and chronic administration of the extract was tested in pentylenetetrazole (PTZ) induced seizures in wistar rats. Four groups, each containing 6 rats, were used to evaluate acute and chronic effects of the extract. The four groups were treated with distilled water 10 mL/kg (control group), Valproic acid 200 mg/kg (standard), aqueous extract of C. procera 250 mg/kg and 500 mg/kg respectively. In acute study, PTZ (60 mg/kg, intraperitoneally) was given 1 h after drugs were administered. In chronic study, all drugs were given for 6 weeks following which PTZ was given 1 h after last dose of each drug. The time taken for the onset of myoclonic jerk, seizures and duration of seizures was recorded. GABA levels were estimated in the brain homogenate. Data was analysed by one way analysis of variance followed by Tukey’s test.Results: Acute and chronic administration of the extract significantly increased the time to onset of first clonus and seizures and decreased the total duration of seizures. There was no significant change in GABA levels.Conclusions: Both acute and chronic administration of aqueous extract of leaves of Calotropis procera in Wistar rats inhibited pentylenetetrazole induced seizures in rats
Finding Local Low-mass Supermassive Black Holes
The low-mass end of the supermassive black hole mass function is unknown and
difficult to determine. Here we discuss our successful program to find active
nuclei of late type "normal" galaxies using X-ray detections and
multiwavelength identifications. We conclude that most of the Chandra detected
nuclear X-ray sources are AGNs. We then outline methods of black hole mass
determination when broad emission lines are unobservable.Comment: 7 pages. To appear in the proceedings of the Second Kolkata
Conference on Observational Evidence for Black Holes, Kolkata, February 200
Detecting Low-Mass Supermassive Black Holes
We demonstrate the feasibility of uncovering supermassive black holes in
late-type, quiescent spiral galaxies by detecting signs of very low-level
nuclear activity. We use a combination of x-ray selection and multi-wavelength
follow-up. Here, we apply this technique to NGC 3184 and NGC 5457, both of type
Scd, and show that strong arguments can be made that both host AGNs.Comment: 4 pages. To appear in the proceedings of the Second Kolkata
Conference on Observational Evidence for Black Holes, Kolkata, February 200
Non-monotonic size dependence of the elastic modulus of nanocrystalline ZnO embedded in a nanocrystalline silver matrix
We present the first high pressure Raman study on nanocrystalline ZnO films
with different average crystallite sizes. The problem of low Raman signals from
nano sized particles was overcome by forming a nanocomposite of Ag and ZnO
nanoparticles. The presence of the nanodispersed Ag particles leads to a
substantial surface enhancement of the Raman signal from ZnO. We find that the
elastic modulus of nanocrystalline ZnO shows a non-monotonic dependence on the
crystallite size. We suggest that the non-monotonicity arises from an interplay
between the elastic properties of the individual grains and the intergranular
region.Comment: 10 pages, 6 figure
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