A5108057105- Organic Electronics and Photovoltaics
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Physics of Superconductivity and Magnetism
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Thin-Film Transistor Technologies
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Optimal Power Flow Distribution
- Astrophysics and Star Formation Studies
- Advanced Condensed Matter Physics
- Adaptive optics and wavefront sensing
- Quantum Dots Synthesis And Properties
- Electric Power System Optimization
- Smart Grid Energy Management
- Synthesis of heterocyclic compounds
- Advancements in Semiconductor Devices and Circuit Design
- Astrophysics and Cosmic Phenomena
- Quantum many-body systems
- Chalcogenide Semiconductor Thin Films
- Astronomical Observations and Instrumentation
- Perovskite Materials and Applications
- ZnO doping and properties
- Semiconductor materials and interfaces
Jawaharlal Nehru University
2012-2025
Aryabhatta Research Institute of Observational Sciences
2015-2024
University of Lucknow
2010-2024
Indira Gandhi Delhi Technical University for Women
2022-2024
Institute of Post Graduate Medical Education and Research
2024
Govind Ballabh Pant Hospital
2024
Maulana Azad National Institute of Technology
2014-2024
Banaras Hindu University
2005-2024
M.J.P. Rohilkhand University
2023-2024
Manav Rachna International Institute of Research and Studies
2024
Our study shows that the surface energy of all 2D layered materials is undoubtedly dominated by London–van der Waals forces with little contribution from dipole–dipole interactions.
In this paper, a technique based on nondominated sorting genetic algorithm-II (NSGA-II) is presented for solving the service restoration problem in an electric power distribution system. Due to presence of various conflicting objective functions and constraints, task multiobjective, multiconstraint optimization problem. contrast conventional genetic-algorithm (GA)-based approach, approach does not require weighting factors conversion such multiobjective into equivalent single function work,...
Enhancing the output power of a nanogenerator is essential in applications as sustainable source for wireless sensors and microelectronics. We report here novel approach that greatly enhances piezoelectric generation by introducing p-type polymer layer on semiconducting thin film. Holes at film surface reduce potential screening effect caused free electrons material. Furthermore, additional carriers from conducting shift Fermi level help increasing output. Poly(3-hexylthiophene) (P3HT) was...
Here we report a new type of stretchable transparent piezoelectric nanogenerator (NG) using an organic material consisting poly(vinylidene fluoride trifluoroethylene) [P(VDF-TrFE)] sandwiched with mobility-modified chemical vapor deposition-grown graphene electrodes by ferroelectric polarization into P(VDF-TrFE). This NG has very high sensitivity and mechanical durability fully flexible, rollable, stretchable, foldable, twistable properties. We also investigated the P(VDF-TrFE) remnant...
Precise control of morphologies one- or two-dimensional nanostructures during growth has not been easy, usually degrading device performance and therefore limiting applications to various advanced nanoscale electronics optoelectronics. Graphene could be a platform serve as substrate for both morphology direct use electrodes due its ideal monolayer flatness with π electrons. Here, we report that, by using graphene directly substrate, vertically well-aligned zinc oxide (ZnO) nanowires...
Direct current (DC) piezoelectric power generator is promising for the miniaturization of a package and self-powering nanorobots body-implanted devices. Hence, we report first use two-dimensional (2D) zinc oxide (ZnO) nanostructure an anionic nanoclay layer to generate DC output power. The device, made from 2D nanosheets heterojunction, has potential be smallest size package, could used charge wireless nano/micro scale systems without rectifier circuits convert alternating into store...
Motivated by the recent discovery of superconductivity in two dimensional CoO$_2$ layers, we present some possibly useful results RVB mean field theory applied to triangular lattice. Away from half filling, order parameter is found be complex, and yields a fully gapped quasiparticle spectrum. The sign hopping plays crucial role analysis, find that as fragile for one it robust other. Na$_x$CoO$_2\cdot y$H$_2$O argued belong case, comparing LDA Fermi surface with an effective tight binding...
Piezoelectric nanogenerators are promising for the miniaturization of power packages and self-powering nanosystems used in implantable bio-sensing, environmental monitoring, personal electronics. This paper reviews importance as well recent advances generation through with mechanism. discusses several research design efforts that enhanced to commercialize not only nano-systems, but also microelectronic devices, such drive a commercial liquid crystal display, light up emitting diode laser...
Foldable and thermally stable piezoelectric nanogenerators based on cellulose paper are demonstrated. Piezoelectric ZnO nanorods were produced substrates. The shown to be electrically under external mechanical loads. Furthermore, they have superior charge scavenging performance even harsh conditions. Detailed facts of importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors....
We report on the discovery and observations of extremely luminous optical transient CSS100217:102913+404220 (CSS100217 hereafter). Spectroscopic show this was coincident with a galaxy at redshift z=0.147, reached an apparent magnitude V ~ 16.3. After correcting for foreground Galactic extinction we determine absolute to be M_V =-22.7 approximately 45 days after maximum light. Based our unfiltered photometry peak emission L = 1.3 x 10^45 erg s^-1, over period 287 rest-frame had integrated...
We present densely sampled UBVRI/griz photometric and low-resolution (6–10 Å) optical spectroscopic observations from 4 to 270 d after explosion of a newly discovered Type II SN 2012aw in nearby (∼9.9 Mpc) galaxy M95. The light-curve characteristics apparent magnitudes, colours, bolometric luminosity the presence evolution prominent spectral features are found have striking similarity with archetypal IIP SNe 1999em, 1999gi 2004et. early time clearly detect minima light curve V, R I bands...
Childhood community acquired pneumonia (CAP) is a significant problem in developing countries, and confirmation of microbial etiology important for individual, as well public health. However, there paucity data from large cohort, examining multiple biological specimens diverse pathogens (bacteria viruses). The Community Acquired Pneumonia Etiology Study (CAPES) was designed to address this knowledge gap.We enrolled children with CAP (based on WHO IMCI criteria tachypnea cough or breathing...
We present optical photometric and spectroscopic observations of SN 2013ej. It is one the brightest Type II supernovae (SNe II) exploded in a nearby (∼10 Mpc) galaxy, NGC 628. The light-curve characteristics are similar to SNe II, but with relatively shorter (∼85 days) steeper (∼1.7 mag (100 days)−1 V) plateau phase. shows large drop 2.4 V-band brightness during plateau-to-nebular transition. absolute ultraviolet (UV) light curves identical 2012aw, showing UV-plateau trend extending up 85...
Type IIP supernovae (SNe) are recognized as independent extragalactic distance indicators; however, keeping in mind the diverse nature of their observed properties well availability good quality data, more and newer events need to be tested for applicability reliable indicators. We use early photometric spectroscopic data eight SNe derive distances host galaxies by using expanding photosphere method (EPM). For five these, EPM is applied first time. In this work, we improved application SYNOW...
We present, for the first time, spectral behavior of aerosol optical depths (AODs) over Manora Peak, Nainital, located at an altitude ∼2 km in Shivalik ranges central Himalayas. The observations were carried out using a multiwavelength solar radiometer during January to December 2002. main results study are extremely low AODs winter, remarkable increase high values summer, and distinct change dependencies from relatively steeper spectra winter shallower ones summer. A comparison total...
It is essential to stabilize and enhance the power output performance of piezoelectric nanogenerators (NGs) in order use them as a sustainable source for wireless sensors, microelectronics, optoelectronic devices. Here, we report facile route maximize zinc oxide (ZnO) nanorod (NR)-based NG presence ultraviolet (UV) light by reducing potential screening effect caused free electrons ZnO NRs via surface passivation. We experimentally theoretically investigated drop NR-based due effect. A simple...
We present the low-resolution spectroscopic and UBVRI broad-band photometric investigations of Type IIb supernova 2011fu, discovered in UGC 01626.The follow-up this event has been initiated a few days after explosion covers period about 175 days.The early-phase light curve shows rise followed by steep decay all bands shares properties very similar to that seen case SN 1993J, with possible detection adiabatic cooling phase.Modelling quasi-bolometric suggests progenitor had an extended (∼ 1 ×...
We present densely-sampled ultraviolet/optical photometric and low-resolution optical spectroscopic observations of the type IIP supernova 2013ab in nearby ($\sim$24 Mpc) galaxy NGC 5669, from 2 to 190d after explosion. Continuous observations, with cadence typically a day one week, were acquired 1-2m class telescopes LCOGT network, ARIES India various other around globe. The light curve spectra suggest that SN is normal event plateau duration $ \sim80 days mid absolute visual magnitude...
We investigate the quantum phases of frustrated spin-$\frac{1}{2}$ $J_1$-$J_2$-$J_3$ Heisenberg model on square lattice with ferromagnetic $J_1$ and antiferromagnetic $J_2$ $J_3$ interactions. Using pseudo-fermion functional renormalization group technique, we find an intermediate paramagnetic phase located between classically ordered ferromagnetic, stripy antiferromagnetic, incommensurate spiral phases. observe that fluctuations lead to significant shifts pitch angles compared classical...