A5031137576- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Polyoxometalates: Synthesis and Applications
- Particle Accelerators and Free-Electron Lasers
- Parental Involvement in Education
- Astronomy and Astrophysical Research
- Experimental and Theoretical Physics Studies
- Electrocatalysts for Energy Conversion
- Early Childhood Education and Development
- Organoboron and organosilicon chemistry
- Teacher Education and Leadership Studies
- Synthesis and characterization of novel inorganic/organometallic compounds
- Magnetic confinement fusion research
- Relativity and Gravitational Theory
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Astro and Planetary Science
Ben-Gurion University of the Negev
2023-2025
Barkatullah University
2024
Pontificia Universidad Católica de Chile
2024
Institute of Nano Science and Technology
2019-2023
Indian Institute of Astrophysics
2019-2023
Directorate of Coldwater Fisheries Research
2023
Center for Nano Science and Technology
2023
All India Institute of Medical Sciences
2022-2023
Wuhan University
2020-2022
Aryabhatta Research Institute of Observational Sciences
2015-2021
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
Abstract Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission gravitational waves (GWs). We show that observations associated binary black hole (BBH) central engine blazar OJ 287 demand inclusion radiation reaction effects beyond quadrupolar order. It turns out even certain hereditary contributions to GW required predict impact flare timings 287. develop an approach incorporates this effect into BBH...
Abstract We present the results of our power spectral density analysis for BL Lac object OJ 287, utilizing Fermi -LAT survey at high-energy γ -rays, Swift -XRT in X-rays, several ground-based telescopes and Kepler satellite optical, radio GHz frequencies. The light curves are modeled terms continuous-time autoregressive moving average (CARMA) processes. Owing to inclusion data, we were able construct first time optical variability spectrum a blazar without any gaps across ∼6 dex temporal Our...
Oxygen Evolution Reaction (OER) is typically carried out utilizing noble metals and metal oxides based nanostructures. Yet, due to their numerous drawbacks, including high cost, poor stability negative environmental effects; researchers are driven create new electro‐active materials. To that end, we report an ultrathin 2D Co‐MOF [Co2(bpe)2.5(NO3)4(CH3O)] (Co‐MOF) crystallized under hydrothermal conditions, showing a terrific OER activity with overpotential of 267 mV at the current density 10...
First report on POM based hybrid i.e. Anderson cluster solid for OER in a basic medium. Increased efficiency via assembly with acetylene black. The composite shows an overpotential of 330 mV to achieve current density 100 mA cm −2 stability 40 h.
Developing highly competent and low-cost earth-plentiful metal-based oxygen evolution reaction (OER) electrocatalysts is critical for future electrochemical conversion technologies renewable energy systems. Herein, two cobalt-based metal–organic frameworks (Co-MOFs), [Co6(btc)2(DMF)6(HCOO)6] (2D, MOF 1) [Co3(CHOO)9{DMA}3] (3D, 2), where btc = 1,3,5-benzenetricarboxylic acid, DMF N,N-dimethylformamide, DMA dimethylamine, have been crystallized under hydrothermal conditions, from a single...
In the era of renewable energy, electrocatalytic water splitting has always shown considerable potential. Consequently developing earth-abundant, affordable, and durable electrocatalysts for oxygen evolution is crucial. this regard, polyoxometalates have been in spotlight recently because their attractive properties well-defined molecular arrangement. Herein, we report a "polyoxometalate-derived" noble metal-free electrocatalyst efficient "acidic" medium first time. An octamolybdate...
A novel P<sub>2</sub>Mo<sub>5</sub> cluster based hybrid solid [{4,4′-H<sub>2</sub><italic>bpy</italic>}{4,4′-H<italic>bpy</italic>}<sub>2</sub>{H<sub>2</sub>P<sub>2</sub>Mo<sub>5</sub>O<sub>23</sub>}]·5H<sub>2</sub>O with effective anti-proliferation activity against MCF-7, HepG2 and A549 cancer cells comparable a routinely used chemotherapeutic agent, methotrexate (MTX).
We present optical observations and analysis of a bright type Iax SN~2020udy hosted by NGC 0812. The light curve evolution is similar to other SNe. Analytical modeling the quasi bolometric curves SN 2020udy suggests that 0.08$\pm$0.01 M$_{\odot}$ $^{56}$Ni would have been synthesized during explosion. Spectral features are members class showing weak Si {\sc II} line. late-time spectral sequence mostly dominated Iron Group Elements (IGEs) with broad emission lines. Abundance tomography time...
Polyoxometalates (POMs) are an eminent class of metal oxide anionic clusters early transition metals with huge structural diversity. Herein, a [NiW
We present analyses of archival X-ray data obtained from the XMM-Newton satellite and optical photometric 1 m class telescopes ARIES, Nainital a magnetic cataclysmic variable (MCV) Paloma. Two persistent periods at 156 $\pm$ minutes 130 are in data, which we interpret as orbital spin periods, respectively. These similar to those previous well new observations. The soft-X-ray excess seen spectrum Paloma averaged spectra fitted by two-temperature plasma models with temperatures...
This study was conducted with kindergarten teachers in the United States and Japan respect to their beliefs about role of computers educating young children. Overall findings indicated significant differences responses two countries. Generally, U.S. had a more positive attitude toward children, while Japanese concerns. The teachers' own sense competence not related children either country. Respondents from both countries identified lack resources clear guidelines for integrating classroom as...
We analyse the light curve in R band of blazar OJ287, gathered during 2015/2016 observing season. did a search for quasi-periodic oscillations (QPOs) using several methods over wide range timescales. No statistically significant periods were found high-frequency domain both ground-based data and Kepler observations. In longer-period domain, Lomb–Scargle periodogram revealed peaks above 99% significance level. The longest one—about 95 days—corresponds to innermost stable circular orbit (ISCO)...
Detailed timing analyses of three cataclysmic variables, namely 2MASS J09213414−5939068, IGR J16167−4957, and V667 Pup are carried out using the long-baseline high-cadence optical photometric data from Transiting Exoplanet Survey Satellite (TESS). Periods 908.12 ± 0.05 s 990.10 0.06 observed in variation J09213414−5939068 that were not found earlier studies appear to be probable spin beat periods system, respectively. The presence multiple at spin, beat, other sidebands indicates likely...
Abstract We present optical observations and analysis of the bright type Iax supernova SN 2020udy hosted by NGC 0812. The evolution light curve is similar to that other SNe. Analytical modeling quasi-bolometric curves suggests 0.08 ± 0.01 M ⊙ 56 Ni would have been synthesized during explosion. spectral features are those members class, showing a weak Si ii line. late-time sequence mostly dominated iron group elements with broad emission lines. Abundance tomography time series using TARDIS...
Inorganic drugs, especially polyoxometalate-based hybrids, are expected to be developed as promising future metallodrugs. Herein, an organic-inorganic hybrid solid based on pyridine-2-carboxylic acid or picolinic (pic), [(Cu(pic)2)2(Mo8O26)]·8H2O (1), was synthesized. A single-crystal structure of a possesses discrete β-type octamolybdate cluster that supramolecularly aggregates with {Cu2(pic)4}4- complex and eight lattice water molecules. The study indicates the is stable in aqueous medium...
We have carried detailed time-resolved timing analysis of an intermediate polar V709 Cas, using the long-baseline, short-cadence optical photometric data from Transiting Exoplanet Survey Satellite. found orbital period 5.3341±0.0004 hr, a spin 312.75±0.02 sec, and beat 317.93±0.03 which is similar to earlier published results. From continuous high cadence data, we that Cas disc overflow system with disc-fed dominance.