Publications (105)
Multiwavelength Observations of a Flux Rope Formation by Series of Magnetic Reconnection in the Chromosphere
Pankaj Kumar, Vasyl Yurchyshyn, Kyung-Suk Cho +1
Using high-resolution observations from the 1.6 m New Solar Telescope (NST) operating at the Big Bear Solar Observatory (BBSO), we report direct evidence of merging/reconnection of…
The Occurrence and Speed of CMEs Related to Two Characteristic Evolution Patterns of Helicity Injection in Their Solar Source Regions
Sung-Hong Park, Kyung-Suk Cho, Su-Chan Bong +4
Long-term (a few days) variation of magnetic helicity injection was calculated for 28 solar active regions which produced 47 CMEs to find its relationships with the CME occurrence…
Multiwavelength study of a Solar Eruption from AR NOAA 11112 I. Flux Emergence, Sunspot Rotation and Triggering of a Solar Flare
Pankaj Kumar, Sung-Hong Park, K. -S. Cho +1
We analyse the multiwavelength observations of an M2.9/1N flare that occurred in the active region (AR) NOAA 11112 in the vicinity of a huge filament system on 16 October 2010. SDO…
On the Parameterized Complexity of Min-Sum-Radii
Pankaj Kumar, Haiko Müller, Sebastian Ordyniak +1
In the Min-Sum-Radii (MSR) clustering problem, we are given a finite set X of n points in a metric space. The objective is to find at most k clusters centered at a subset of these…
A new class of intrinsic magnet: two-dimensional yttrium sulphur selenide
Pankaj Kumar, Ivan I. Naumov, Priyanka Manchanda +1
Exploring and controlling magnetism in two-dimensional (2D) layered magnetic crystals, as well as their inclusion in heterogeneous assemblies, provide an unprecedented opportunity…
Bandgap Measurement of Reduced Graphene Oxide Monolayers through Scanning Tunnelling Spectroscopy
Pankaj Kumar
Most popular atomically thin carbon material, called graphene, has got no band gap and this particular property of graphene makes it less useful from the aspect of nanoscale transi…
On the Triggering of M-Class Solar Flare due to Loop-loop Interaction in AR NOAA 10875
Pankaj Kumar, Abhishek K. Srivastava, B. V. Somov +3
We present multiwavelength analysis of an M7.9 /1N solar flare which occurred on 27 April 2006 in AR NOAA 10875. The flare was triggered due to the interaction of two loop systems.…
Diabetic Retinopathy Classification using Downscaling Algorithms and Deep Learning
Nishi Doshi, Urvi Oza, Pankaj Kumar
Diabetic Retinopathy (DR) is an art and science of recording and classifying the retinal images of a diabetic patient. DR classification deals with classifying retinal fundus image…
Defect-induced -magnetism in layered platinum diselenide
Priyanka Manchanda, Pankaj Kumar, Pratibha Dev
Platinum diselenide (PtSe) is a recently-discovered extrinsic magnet, with its magnetism attributed to the presence of Pt-vacancies. The host material to these defects itself…
Trigger of successive filament eruptions observed by SDO and STEREO
Sajal Kumar Dhara, Ravindra B., Pankaj Kumar +3
Using multi-wavelength observation from SDO and STEREO, we investigated the mechanism of two successive eruptions (F1 & F2) of a filament in active region NOAA 11444 on 27 march, 2…
Kink Oscillation of a Flux Rope During a Failed Solar Eruption
Pankaj Kumar, Valery M. Nakariakov, Judith T. Karpen +2
We report a decaying kink oscillation of a flux rope during a confined eruptive flare, observed off the solar limb by SDO/AIA, that lacked a detectable white-light coronal mass eje…
Macroscopic Characteristics of Mixed Traffic Flow with Deep Reinforcement Learning Based Automated and Human-Driven Vehicles
Pankaj Kumar, Pranamesh Chakraborty, Subrahmanya Swamy Peruru
Automated Vehicle (AV) control in mixed traffic, where AVs coexist with human-driven vehicles, poses significant challenges in balancing safety, efficiency, comfort, fuel efficienc…
Attacking Graph Foundation Models Through Their Shared Representation
Pankaj Kumar, Subhankar Mishra
A graph foundation model generalizes across graph domains by mapping every input into one shared representation before any task reasoning. We call this map the alignment layer, the…
Interacting Ghost Dark Energy with Sign-Changeable Coupling in Brans-Dicke Cosmology
Kirti Mehta, Pankaj Kumar, N. Myrzakulov +1
In this study, we analyze the ghost dark energy model in Brans-Dicke cosmology in the framework of a flat Friedmann-Lemaitre-Robertson-Walker universe. We consider an interaction b…
Trace-Distance based End-to-End Entanglement Fidelity with Information Preservation in Quantum Networks
Pankaj Kumar, Binayak Kar, Shan-Hsiang Shen
Quantum networks hold the potential to revolutionize a variety of fields by surpassing the capabilities of their classical counterparts. Many of these applications necessitate the…
Holographic dark energy models with statefinder diagnostic in modified gravity
C. P. Singh, Pankaj Kumar
We study non-viscous and viscous holographic dark energy models for a homogeneous and isotropic flat Friedmann-Robertson-Walker Universe in gravity. We find that the Hubbl…
Elastic tensor-derived properties of composition-dependent disordered refractory binary alloys using DFPT
Surya T. Bijjala, Susan R. Atlas, Pankaj Kumar
The elastic tensor provides valuable insight into the mechanical behavior of a material with lattice strain, such as disordered binary alloys. Traditional stress-strain methods hav…
Initiation of CME and Associated Flare Caused by Helical Kink Instability Observed by SDO/AIA
Pankaj Kumar, K. -S. Cho, S. -C. Bong +2
In this paper, we present multiwavelength observations of helical kink instability as a trigger of a CME which occurred in AR NOAA 11163 on 24 February 2011. The CME was associated…
Ionospheric response to the space weather event of 18 November 2003 -- An investigation
Pankaj Kumar, Wahab Uddin, Alok Taori +2
The present study explores the ionospheric effects of the well cited solar flare events (M3.2, M3.9/2N) of 18 November 2003 associated with CMEs. The Hα observations of these flar…
Observation of a Large-scale Quasi-circular Secondary Ribbon associated with Successive Flares and a Halo CME
Eun-Kyung Lim, Vasyl Yurchyshyn, Pankaj Kumar +7
Solar flare ribbons provide an important clue to the magnetic reconnection process and associated magnetic field topology in the solar corona. We detected a large-scale secondary f…
Chaotic Dynamics of One-Dimensional Systems with Periodic Boundary Conditions
Pankaj Kumar, Bruce N. Miller
We provide appropriate tools for the analysis of dynamics and chaos for one-dimensional systems with periodic boundary conditions. Our approach allows for the investigation of the…
Self-Similar Outflows at the Source of the Fast Solar Wind: A Smoking Gun of Multiscale Impulsive Reconnection?
Vadim M. Uritsky, Judith T. Karpen, Nour E. Raouafi +3
We present results of a quantitative analysis of structured plasma outflows above a polar coronal hole observed by the Atmospheric Imaging Assembly onboard the Solar Dynamics Obser…
Relativistic approach for the determination of nuclear and neutron star properties in consideration of PREX-II results
Virender Thakur, Raj Kumar, Pankaj Kumar +6
The bulk properties of nuclear matter and neutron stars with the newly generated relativistic interaction DBHP are investigated which provides an opportunity to modify the coupling…
Friedmann model with viscous cosmology in modified gravity theory
C. P. Singh, Pankaj Kumar
In this paper, we introduce bulk viscosity in the formalism of modified gravity theory in which the gravitational action contains a general function , where and den…
New agegraphic dark energy in Brans-Dicke theory with logarithmic form of scalar field
Pankaj Kumar, C. P. Singh
In a very recent paper, the current authors (arXiv:gr-qc/1609.01477) have proposed and analyzed in detail the logarithmic form of Brans-Dicke scalar field as $Ï\propto ln(α+…
MieAI: A neural network for calculating optical properties of internally mixed aerosol in atmospheric models
Pankaj Kumar, Heike Vogel, Julia Bruckert +2
Aerosols influence weather and climate by interacting with radiation through absorption and scattering. These effects heavily rely on the optical properties of aerosols, which are…
X-ray/Radio Quasi-periodic Pulsations Associated with Plasmoids in Solar Flare Current Sheets
Pankaj Kumar, Judith T. Karpen, Joel T. Dahlin
Plasmoids (or magnetic islands) are believed to play an important role in the onset of fast magnetic reconnection and particle acceleration during solar flares and eruptions. Direc…
Multi-Wavelength Observations of a Flux Rope Failed in the Eruption and Associated M-Class Flare from NOAA AR 11045
Pankaj Kumar, A. K. Srivastava, B. Filippov +2
We present the multi-wavelength observations of a flux rope that was trying to erupt from NOAA AR 11045 and the associated M-class solar flare on 12 February 2010 using space and g…
Multiwavelength study of a Solar Eruption from AR NOAA 11112: II. Large-Scale Coronal Wave and Loop Oscillation
Pankaj Kumar, K. -S. Cho, P. F. Chen +2
We analyse multiwavelength observations of an M2.9/1N flare that occurred in AR NOAA 11112 on 16 October 2010. AIA 211 Ã EUV images reveal the presence of a faster coronal wave (de…
Lyapunov spectra of Coulombic and gravitational periodic systems
Pankaj Kumar, Bruce N. Miller
We compute Lyapunov spectra for Coulombic and gravitational versions of the one-dimensional systems of parallel sheets with periodic boundary conditions. Exact time evolution of ta…
Characterization of the Intrinsic and Extrinsic Resistances of a Microwave Graphene FET Under Zero Transconductance Conditions
Xiomara Ribero-Figueroa, Anibal Pacheco-Sanchez, Aida Mansouri +7
Graphene field-effect transistors exhibit negligible transconductance under two scenarios: for any gate-to-source voltage when the drain-to-source voltage is set to zero, and for a…
Thermodynamic implications and observational constraints of interacting gravity in FRW Universe
S. H. Shekh, S. B. Thool, Pankaj Kumar +2
This work investigates the dynamical evolution of the universe within the framework of symmetric teleparallel gravity, where is the non-metricity scalar and…
Single Electron Quantum Dot in Two-Dimensional Transition Metal Dichalcogenides
JarosÅaw PawÅowski, Pankaj Kumar, Kenji Watanabe +4
Spin-valley properties in two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDC) has attracted significant interest due to the possible applications in quantum…
Engineering Surface Oxygen Vacancies in to Form a High Mobility and Transparent Quasi Two dimensional Electron System
Shyam Sundar Yadav, Shelender Kumar, Pankaj Kumar +1
Quasi-two-dimensional electron systems (q-2DES) are formed in various hetero-structures, including oxide interfaces. Oxygen vacancies (OVs) in oxides like are kn…
Formation and Eruption of a Small Flux Rope in the Chromosphere Observed by NST, IRIS, and SDO
Pankaj Kumar, Vasyl Yurchyshyn, Haimin Wang +1
Using high-resolution images from 1.6 m New Solar Telescope (NST) at Big Bear Solar Observatory (BBSO), we report the direct evidence of chromospheric reconnection at the polarity…
First Detection of Plasmoids from Breakout Reconnection on the Sun
Pankaj Kumar, Judith T. Karpen, Spiro K. Antiochos +2
Transient collimated plasma ejections (jets) occur frequently throughout the solar corona, in active regions, quiet Sun, and coronal holes. Although magnetic reconnection is genera…
Dynamic complexity of Reachability: How many changes can we handle?
Samir Datta, Pankaj Kumar, Anish Mukherjee +3
In 2015, it was shown that reachability for arbitrary directed graphs can be updated by first-order formulas after inserting or deleting single edges. Later, in 2018, this was exte…
Evidence of Solar Flare Triggering due to Loop-Loop Interaction Caused by Footpoint Shear-Motion
Pankaj Kumar, A. K. Srivastava, B. V. Somov +3
We analyze multi-wavelength data of a M7.9/1N class solar flare which occurred on 27 April, 2006 from AR NOAA 10875. GOES soft X-ray images provide the most likely signature of two…
Tricontrollable pixelated metasurface for absorbing terahertz radiation
Pankaj Kumar, Akhlesh Lakhtakia, Pradip Kumar Jain
The incorporation of materials with controllable electromagnetic constitutive parameters allows the conceptualization and realization of controllable metasurfaces. With the aim of…
Extended Kohler's scaling, a low temperature anomaly and Isosbestic point in the charge density wave state of 1T-VSe
Sonika, Sunil Gangwar, Pankaj Kumar +2
1T-VSe is a narrow band transition metal chalcogenide that shows charge density wave (CDW) state below = 110 K. Here, we have explored the relevance of Kohler's rule…
Multiwavelength observations of a breakout jet at an active region periphery
Pradeep Kayshap, Judith T. Karpen, Pankaj Kumar
We analysed Interface-Region Imaging Spectrograph (IRIS) and the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations of a small coronal jet that occurred…
Eruption of a plasma blob, associated M-class flare, and large-scale EUV wave observed by SDO
Pankaj Kumar, P. K. Manoharan
We present a multiwavelength study of the formation and ejection of a plasma blob and associated EUV waves in AR NOAA 11176, observed by SDO/AIA and STEREO on 25 March 2011. SDO/AI…
Observational constraint from the heaviest pulsar PSR J0952-0607 on the equation of state of dense matter in relativistic mean field model
Raj Kumar, Mukul Kumar, Virender Thakur +5
In the present work, we constrain the equation of the state of dense matter in the context of heaviest observed neutron star mass M = 2.35 M for the bla…
Observation of a Quasi-periodic Pulsation in Hard X-ray, Radio and Extreme-ultraviolet Wavelengths
Pankaj Kumar, Valery M. Nakariakov, Kyung-Suk Cho
We present multi-wavelength analysis of a quasi-periodic pulsation (QPP) observed in the hard X-ray, radio, and extreme-ultraviolet (EUV) channels during an M1.9 flare occurred on…
Flare Generated Shock Wave Propagation Through Solar Coronal Arcade Loops and Associated Type II Radio Burst
Pankaj Kumar, D. E. Innes, K. S. Cho
This paper presents multiwavelength observations of a flare-generated type II radio burst. The kinematics of the shock derived from the type II closely match a fast EUV wave seen p…
Analysis of the Impact of the Union Budget Announcements on the Indian Stock Market: A Fractal Perspective
Mridul Patel, Geetika Verma, Andrew Eberhard +2
The stock market closely monitors macroeconomic policy announcements, such as annual budget events, due to their substantial influence on various economic participants. These event…
Quantum Key Distribution Routing Protocol in Quantum Networks: Overview and Challenges
Pankaj Kumar, Neel Kanth Kundu, Binayak Kar
The use of quantum cryptography in everyday applications has gained attention in both industrial and academic fields. Due to advancements in quantum electronics, practical quantum…
Microscopic study of the Shell Structure evolution in isotopes of light to middle mass range Nuclides
Virender Thakur, Pankaj Kumar, Suman Thakur +3
The shell structure of even-even isotopes in Si, S, Ar and Ca has been analysed. The theoretical calculations of shell closure parameter and the differential variation…
Multiwavelength observation of a large-scale flux rope eruption above kinked mini-filament
Pankaj Kumar, Kyung-Suk Cho
We analyse multiwavelength observations of a western limb flare (C3.9) occurred in AR NOAA 111465 on 30 April 2012. The high resolution images recorded by SDO/AIA 304, 1600 Ã and H…
Observations of Multiple Surges Associated with Magnetic Activities in AR10484 on 25 October 2003
Wahab Uddin, B. Schmieder, R. Chandra +3
We present a multiwavelength study of recurrent surges observed in Hα, UV (SOHO/EIT) and Radio (Learmonth, Australia) from the super-active region NOAA 10484 on 25 October, 2003.…
Magnetic field decouples nodeless surface and nodal bulk orders in PdTe
Atanu Mishra, Ghulam Mohmad, Kiran Bansal +4
Selective spectroscopic disentanglement of surface and bulk quantum orders remains an outstanding challenge in condensed matter physics. The candidate topological superconductor Pd…
Solar Eruption Onset and Particle Acceleration in Nested-Null Topologies
Pankaj Kumar, Judith T. Karpen, Peter F. Wyper +3
The magnetic breakout model explains a variety of solar eruptions, ranging from small-scale jets to large-scale coronal mass ejections (CMEs). Most of our previous studies are focu…
Brooks' Theorem in Graph Streams: A Single-Pass Semi-Streaming Algorithm for -Coloring
Sepehr Assadi, Pankaj Kumar, Parth Mittal
Every graph with maximum degree can be colored with colors using a simple greedy algorithm. Remarkably, recent work has shown that one can find such a coloring even i…
New Evidence on the Origin of Solar Wind Microstreams/Switchbacks
Pankaj Kumar, Judith T. Karpen, Vadim M. Uritsky +4
Microstreams are fluctuations in the solar wind speed and density associated with polarity-reversing folds in the magnetic field (also denoted switchbacks). Despite their long heri…
X-ray and EUV Observations of Simultaneous Short and Long Period Oscillations in Hot Coronal Arcade Loops
Pankaj Kumar, Valery M. Nakariakov, Kyung-Suk Cho
We report decaying quasi-periodic intensity oscillations in the X-ray (6-12 keV) and extreme ultraviolet (EUV) channels (131, 94, 1600, 304 Ã ) observed by the Fermi GBM (Gamma-ray…
Multiwavelength Study of M8.9/3B Solar Flare from AR NOAA 10960
Pankaj Kumar, A. K. Srivastava, B. Filippov +1
We present a multi-wavelength analysis of a long duration white-light solar flare (M8.9/3B) event that occurred on 4 June 2007 from NOAA AR 10960. The flare was observed by several…
Magnetic filed dynamics and varying plasma emission in large coronal loops
Seray Åahin, Vasyl Yurchyshyn, Pankaj Kumar +3
In this study we report detailed observations of magnetic environment at four footpoints of two warm coronal loops observed on 5 May 2016 in NOAA AR 12542 (Loop I) and 17 Dec 2015…
Plasmoids, Flows, and Jets During Magnetic Reconnection in a Failed Solar Eruption
Pankaj Kumar, Judith T. Karpen, Spiro K. Antiochos +3
We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from SDO/AIA, IRIS, STEREO, and Hinode/SOT. A…
Multiwavelength Observations of an Eruptive Flare: Evidence for Blast Waves and Break-out
Pankaj Kumar, D. E. Innes
Images of an east-limb flare on 3 November 2010 taken in the 131 Ã channel of the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory provide a convincing example o…
Study of Magnetic Helicity Injection in the Active Regions NOAA 9236 Producing Multiple Flare-associated CME Events
Sung-Hong Park, Kanya Kusano, Kyung-Suk Cho +6
To better understand a preferred magnetic field configuration and its evolution during Coronal Mass Ejection events, we investigated the spatial and temporal evolution of photosphe…
Nuclear shape evolution and shape coexistence in Zr and Mo isotopes
Pankaj Kumar, Virender Thakur, Smriti Thakur +2
The phenomena of shape evolution and shape coexistence in even-even Zr and Mo isotopes is studied by employing covariant density functional theory (CDFT) with…
Evolution of Solar Magnetic Field and Associated Multi-wavelength Phenomena: Flare events on 20 November 2003
Pankaj Kumar, P. K. Manoharan, Wahab Uddin
We analyze H-alpha images, soft X-ray profiles, magnetograms, extreme ultra-violet images and radio observations of two homologous flare events (M1.4/1N and M9.6/2B) on 20 November…
Graphene pixel-based polarization-insensitive metasurface for {almost perfect and wideband} terahertz absorption
Pankaj Kumar, Akhlesh Lakhtakia, Pradip K. Jain
Absorption of terahertz waves by a metasurface comprising a biperiodic array of pixellated meta-atoms on top of a dielectric substrate backed by a perfect electric conductor was si…
Quasi-Periodic Radio Bursts Associated with Fast-mode Waves near a Magnetic Null Point
Pankaj Kumar, Valery M. Nakariakov, Kyung-Suk Cho
This paper presents an observation of quasi-periodic rapidly-propagating waves observed in the AIA 171/193 Ã ~ channels during the impulsive phase of an M1.9 flare occurred on 7 Ma…
Confined exciton polaron in MoS on twisted-hBN
Garima Gupta, Mayank Chhaperwal, Pankaj Kumar +5
The simple electrostatic picture of a trion is that of an excess charge inducing an exciton polarization and binding closer (farther) to the hole (electron) side of it. Trion forma…
Relativistic Mean Field Model parameterizations in the light of GW170817, GW190814, and PSR J0740 + 6620
Virender Thakur, Raj Kumar, Pankaj Kumar +3
Three parameterizations DOPS1, DOPS2, and DOPS3 (named after the Department of Physics Shimla) of the Relativistic Mean Field (RMF) model have been proposed with the inclusion of a…
Observation of a Short Period Quasi-Periodic Pulsation in Solar X-ray, Microwave and EUV Emissions
Pankaj Kumar, Valery M. Nakariakov, Kyung-Suk Cho
This paper presents the multi-wavelength analysis of a 13 s quasi-periodic pulsation (QPP) observed in hard X-ray (12-300 keV) and microwave (4.9-34 GHz) emissions during a C-class…
Direct Imaging of a Prolonged Plasma/Current Sheet and Quasiperiodic Magnetic Reconnection on the Sun
Pankaj Kumar, Judith T. Karpen, Vasyl Yurchyshyn +2
Magnetic reconnection is widely believed to be the fundamental process in the solar atmosphere that underlies magnetic energy release and particle acceleration. This process is res…
Predicting phase preferences of two-dimensional transition metal dichalcogenides using machine learning
Pankaj Kumar, Vinit Sharma, Sharmila Shirodkar +1
Two-dimensional transition metal dichalcogenides (TMDs) can adopt one of several possible structures, with the most common being the trigonal prismatic and octahedral symmetry phas…
Experimental study to optimise the treatment efficacy of pharmaceutical effluents by combining electron beam irradiation with conventional techniques
Pankaj Kumar, Manisha Meena, Anjali Bhagwan Kavar +7
The inability of conventional methods to completely remove the contaminants from pharmaceutical effluents led us to study the effect of Electron Beam (EB) irradiation on real pharm…
Multiwavelength Study of Equatorial Coronal-Hole Jets
Pankaj Kumar, Judith T. Karpen, Spiro K. Antiochos +3
Jets (transient/collimated plasma ejections) occur frequently throughout the solar corona and contribute mass/energy to the corona and solar wind. By combining numerical simulation…
Signature of point nodal superconductivity in the Dirac semimetal PdTe
C. S. Yadav, Sudeep Kumar Ghosh, Pankaj Kumar +2
Recent Angle-Resolved Photo-emission Spectroscopy (ARPES) experiments [Phys. Rev. Lett. 130, 046402 (2023)] on PdTe, a 3D-Dirac semimetal and a superconductor with the transition t…
Partial Reflection and Trapping of a Fast-mode Wave in Solar Coronal Arcade Loops
Pankaj Kumar, D. E. Innes
We report on the first direct observation of a fast-mode wave propagating along and perpendicular to cool (171 Ã ) arcade loops observed by the SDO/AIA. The wave was associated wit…
Deep reinforcement learning-based longitudinal control strategy for automated vehicles at signalised intersections
Pankaj Kumar, Aditya Mishra, Pranamesh Chakraborty +1
Developing an autonomous vehicle control strategy for signalised intersections (SI) is one of the challenging tasks due to its inherently complex decision-making process. This stud…
Deep Hawkes Process for High-Frequency Market Making
Pankaj Kumar
High-frequency market making is a liquidity-providing trading strategy that simultaneously generates many bids and asks for a security at ultra-low latency while maintaining a rela…
Observation of multiple sausage oscillations in cool postflare loop
A. K. Srivastava, T. V. Zaqarashvili, W. Uddin +2
Using simultaneous high spatial (1.3 arc sec) and temporal (5 and 10 s) resolution H-alpha observations from the 15 cm Solar Tower Telescope at ARIES, we study the oscillations in…
Observation of Kink Instability as Driver of Recurrent Flares in AR 10960
A. K. Srivastava, Pankaj Kumar, T. V. Zaqarashvili +3
We study the active region NOAA 10960, which produces two flare events (B5.0, M8.9) on 04 June 2007. We find the observational signature of right handed helical twists in the loop…
Thermodynamics of a one-dimensional self-gravitating gas with periodic boundary conditions
Pankaj Kumar, Bruce N. Miller, Dan Pirjol
We study the thermodynamical properties of a one-dimensional gas with one-dimensional gravitational interactions, and placed in a uniform mass background. Periodic boundary conditi…
Topological chaos, braiding and bifurcation of almost-cyclic sets
Piyush Grover, Shane D. Ross, Mark A. Stremler +1
In certain two-dimensional time-dependent flows, the braiding of periodic orbits provides a way to analyze chaos in the system through application of the Thurston-Nielsen classific…
Direct Imaging of Magnetohydrodynamic Wave Mode Conversion Near a 3D Null Point on the Sun
Pankaj Kumar, Valery M. Nakariakov, Judith T. Karpen +1
Mutual conversion of various kinds of magnetohydrodynamic (MHD) waves can have profound impacts on wave propagation, energy transfer, and heating of the solar chromosphere and coro…
Amalgamated CHIRP and OFDM for ISAC
Pankaj Kumar, Mohammed El-Hajjar, Ibrahim A. Hemadeh +4
Integrated Sensing and Communication (ISAC) requires the development of a waveform capable of efficiently supporting both communication and sensing functionalities. This paper prop…
Robustness in Large Language Models: A Survey of Mitigation Strategies and Evaluation Metrics
Pankaj Kumar, Subhankar Mishra
Large Language Models (LLMs) have emerged as a promising cornerstone for the development of natural language processing (NLP) and artificial intelligence (AI). However, ensuring th…
Doping-limitations of cubic boron nitride: effects of unintentional defects on shallow doping
Tamanna Joshi, Pankaj Kumar, Bipul Poudyal +3
Cubic boron nitride (cBN) is an ultra-wide bandgap, super-hard material with potential for extreme-temperature and -pressure applications. A proof-of-principle p-n junction using c…
From Pseudostreamer Jets to CMEs: Observations of the Breakout Continuum
Pankaj Kumar, Judith T. Karpen, Spiro K. Antiochos +3
The magnetic breakout model, in which reconnection in the corona leads to destabilization of a filament channel, explains numerous features of eruptive solar events, from small-sca…
Untangling 3D atomic reconstruction in twisted bilayer 2D crystals via dark field transmission electron microscopy
Pankaj Kumar, Michel Bosman, Nikolai Lavrentev +4
Reconstruction of the atomic crystal structure in twisted 2D materials has been demonstrated to be responsible for multiple exciting phenomena in van der Waals heterostructures, fr…
Observations of a Series of Flares and Associated Jet-like Eruptions Driven by the Emergence of Twisted Magnetic Fields
Eun-Kyung Lim, Vasyl Yurchyshyn, Sung-Hong Park +8
We studied temporal changes of morphological and magnetic properties of a succession of four confined flares followed by an eruptive flare using the high-resolution New Solar Teles…
SDO/AIA Observations of a Reflecting Longitudinal Wave in a Coronal Loop
Pankaj Kumar, D. E. Innes, B. Inhester
We report high resolution observations from the SDO/AIA of intensity oscillations in a hot, T~8-10 MK, loop. The AIA images show a large coronal loop that was rapidly heated follow…
Observation of kink instability during small B5.0 solar flare on 04 June, 2007
A. K. Srivastava, T. V. Zaqarashvili, Pankaj Kumar +1
Using multi-wavelength observations of SoHO/MDI, SOT-Hinode/blue-continuum (4504 Ã ), G-band (4305 Ã ), Ca II H (3968 Ã ) and TRACE 171 Ã , we present the observational signature o…
A heavy-tail arctan-based mixture model for modelling and measuring actuarial risk
Pankaj Kumar, Vivek Vijay
Heavy-tailed probability distributions are extremely useful and play a crucial role in modeling different types of financial data sets. This study presents a two-pronged methodolog…
Quasiperiodic Energy Release and Jets at the Base of Solar Coronal Plumes
Pankaj Kumar, Judith T. Karpen, Vadim M. Uritsky +3
Coronal plumes are long, ray-like, open structures, which have been considered as possible sources for the solar wind. Their origin in the largely unipolar coronal holes has long b…
Finite Volume Einstein Finsler Warped Product Manifolds of Non-positive or Non-negative Scalar Curvature
Mohammad Aqib, Hemangi Madhusudan Shah, Pankaj Kumar +1
The notion of warped product plays an important role in Riemannian geometry moreover in geodesic metric spaces. The warped product was first introduced by Bishop and O'Neill to stu…
Imaging and Radio Signatures of Shock-Plasmoid Interaction
Pankaj Kumar, Judith T. Karpen, P. K. Manoharan +1
Understanding how shocks interact with coronal structures is crucial for understanding the mechanisms of particle acceleration in the solar corona and inner heliosphere. Using simu…
Vortex dynamics of accelerated flow past a mounted wedge
Jiten C Kalita, Pankaj Kumar
This study is concerned with the simulation of a complex fluid flow problem involving flow past a wedge mounted on a wall for channel Reynolds numbers , and $6873…
Fast Ion Surface Energy Loss and Straggling in the Surface Wake Fields
T. Nandi, K. Haris, Hala +10
We have measured the stopping powers and straggling of fast, highly ionized atoms passing through thin bilayer targets made up of metals and insulators. We were surprised to find t…
Routing Protocols for Quantum Networks: Overview and Challenges
Binayak Kar, Pankaj Kumar
Over the past 50 years, conventional network routing design has undergone substantial growth, evolving from small networks with static nodes to large systems connecting billions of…
Transient induced MHD oscillations : A tool to probe the solar active regions
Abhishek K. Srivastava, V. M. Nakariakov, B. N. Dwivedi +1
Solar transients and eruptive phenomena which are ubiquitous in the solar atmosphere, can shed new light to the understanding of the outstanding problems like coronal heating and t…
Subchromatic numbers of powers of graphs with excluded minors
Pedro P. Cortés, Pankaj Kumar, Benjamin Moore +2
A -subcolouring of a graph is a function such that the set of vertices coloured induce a disjoint union of cliques. The subchromatic number…
Thickness-dependence of hydrogen-induced phase transition in MoTe
Priyanka Manchanda, Pankaj Kumar, Pratibha Dev
Two-dimensional transition metal dichalcogenides (TMDs) usually exist in two or more structural phases with different physical properties, and can be repeatedly switched between th…
Holographic dark energy in Brans-Dicke theory with logarithmic form of scalar field
C P Singh, Pankaj Kumar
In this paper, an interacting holographic dark energy model with Hubble horizon as an infra-red cut-off is considered in the framework of Brans-Dicke theory. We propose a logarithm…
Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection Generated Velocity Pulse in AR10808
A. K. Srivastava, R. Erdelyi, K. Murawski +1
Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE) 171 Ã , and H fr…