Results for "Amlan K. Roy"

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Studies on bound-state spectra of Manning-Rosen potentialSep 08 2014Accurate ro-vibrational energies, eigenfunctions, radial densities, expectation values are presented for the exponential-type Manning-Rosen (MR) potential. Bound states accurate up to ten significant figure are obtained by employing a simple, reliable ... More
Density functional calculation of many-electron systems in cartesian coordinate gridJan 14 2010A recently developed density functional method, within Hohenberg-Kohn-Sham framework, is used for faithful description of atoms, molecules in Cartesian coordinate grid, by using an LCAO-MO ansatz. Classical Coulomb potential is obtained by means of a ... More
Accurate ro-vibrational spectroscopy of diatomic molecules in a Morse oscillator potentialJul 18 2013This work presents the bound-state spectra of Morse oscillator, which remains one of the oldest important model potentials for molecules. Accurate ro-vibrational energies are obtained by means of a generalized pseudospectral method that offers an optimal, ... More
A density functional method for general excited states in atomsApr 18 2019This chapter presents the development of a density functional theory (DFT)-based method for accurate, reliable treatment of various resonances in atoms. Many of these are known to be notorious for their strong correlation, proximity to more than one thresholds, ... More
Studies on the bound-state spectrum of hyperbolic potentialSep 08 2014Bound states of hyperbolic potential is investigated by means of a generalized pseudospectral method. Significantly improved eigenvalues, eigenfunctions are obtained efficiently for arbitrary $n, \ell$ quantum states by solving the relevant non-relativistic ... More
Accurate calculation of the bound states of Hellmann potentialJul 11 2013Bound states of the Hellmann potential, which is a superposition of the attractive Coulomb ($-A/r$) and the Yukawa ($Be^{-Cr}/r$) potential, are calculated by using a generalized pseudospectral method. Energy eigenvalues accurate up to thirteen to fourteen ... More
Grid-based density functional calculation of many-electron systemsMar 08 2010Exploratory variational pseudopotential density functional calculations are performed for the electronic properties of many-electron systems in the 3D cartesian coordinate grid (CCG). The atom-centered localized gaussian basis set, electronic density ... More
Density functional studies on the hollow resonances in Li-isoelectronic sequence (Z=4--10Jul 09 2013In this sequel to our work on triply excited hollow resonances in three-electron atomic systems, a density functional theory (DFT)-based formalism is employed to investigate similar resonances in Li-isoelectronic series (Z=4--10). A combination of the ... More
Studies on the hollow states of atomic lithium by a density functional approachJul 08 2013Density functional calculations are performed for twelve $2l2l'$n$l"$ (n$\geq$2) triply excited hollow resonance series of Li, {\em viz.,} 2s$^2$ns $^2$S$^e$, 2s$^2$np $^2$P$^o$, 2s$^2$nd $^2$D$^e$, 2p$^2$ns $^2$D$^e$,$^4$P$^e$, 2s2pns $^4$P$^o$, 2s2pnp ... More
Calculation of the bound states of power-law and logarithmic potentials through a generalized pseudospectral methodJul 05 2013Bound states of the power-law and logarithmic potentials are calculated using a generalized pseudospectral method. The solution of the single-particle Schr\"odinger equation in a nonuniform and optimal spatial discretization offers accurate eigenvalues, ... More
A new density functional method for electronic structure calculation of atoms and moleculesApr 18 2019This chapter concerns with the recent development of a new DFT methodology for accurate, reliable prediction of many-electron systems. Background, need for such a scheme, major difficulties encountered, as well as their potential remedies are discussed ... More
Ro-vibrational spectroscopy of molecules represented by a Tietz-Hua oscillator potentialSep 08 2014Accurate low and high-lying bound states of Tietz-Hua oscillator potential are presented. The radial Schr\"odinger equation is solved efficiently by means of the generalized pseudospectral method that enables optimal spatial discretization. Both $\ell=0$ ... More
Ro-vibrational studies of diatomic molecules in a shifted Deng-Fan oscillator potentialSep 08 2014Bound-state spectra of shifted Deng-Fan oscillator potential are studied by means of a generalized pseudospectral method. Very accurate results are obtained for \emph{both low as well as high} states by a non-uniform optimal discretization of the radial ... More
The generalized pseudospectral approach to the bound states of Hulthen and Yukawa potentialsDec 20 2013The generalized pseudospectral method is employed to calculate the bound states of Hulth\'en and Yukawa potentials in quantum mechanics, with special emphases on higher excited states and stronger couplings. Accurate energy eigenvalues, expectation values ... More
A new DFT method for atoms and molecules in Cartesian gridJul 11 2013Electronic structure calculation of atoms and molecules, in the past few decades has largely been dominated by density functional methods. This is primarily due to the fact that this can account for electron correlation effects in a rigorous, tractable ... More
Quantum confinement in 1D systems through an imaginary-time evolution methodJan 19 2018Quantum confinement is studied by numerically solving time-dependent Schr\"odinger equation. An imaginary-time evolution technique is employed in conjunction with the minimization of an expectation value, to reach the global minimum. Excited states are ... More
Ground and excited states of spherically symmetric potentials through an imaginary-time evolution method: Application to spiked harmonic oscillatorsJan 17 2018Starting from a time-dependent Schr\"odinger equation, stationary states of 3D central potentials are obtained. An imaginary-time evolution technique coupled with the minimization of energy expectation value, subject to the orthogonality constraint leads ... More
Calculation of the spiked harmonic oscillators through a generalized pseudospectral methodJul 04 2013The generalized pseudospectral method is employed for the accurate calculation of eigenvalues, densities and expectation values for the spiked harmonic oscillators. This allows \emph{nonuniform} and \emph{optimal} spatial discretization of the corresponding ... More
Studies on some exponential-screened Coulomb potentialsApr 25 2013The generalized pseudospectral method is employed to study the bound-state spectra of some of the exponentially screened Coulomb potentials, \emph{viz.}, the exponential cosine screened Coulomb (ECSC) and general exponential screened Coulomb (GESC) potential, ... More
Studies on some singular potentials in quantum mechanicsJul 10 2013A simple methodology is suggested for the efficient calculation of certain central potentials having singularities. The generalized pseudospectral method used in this work facilitates {\em nonuniform} and optimal spatial discretization. Applications have ... More
Pseudopotential density functional treament of atoms and molecules in cartesian coordinate gridFeb 15 2010This is a follow-up of our recently proposed work on pseudopotential calculation (Ref. [21]) of atoms and molecules within DFT framework, using cartesian coordinate grid. Detailed results are presented to demonstrate the usefulness, applicability of the ... More
A general method for central potentials in quantum mechanicsApr 18 2019We focus on a recently developed generalized pseudospectral method for accurate, efficient treatment of certain central potentials of interest in various branches in quantum mechanics, usually having singularity. Essentially this allows optimal, nonuniform ... More
Information-entropic measures for non-zero l states of confined hydrogen-like ionsApr 04 2019Relative Fisher information (IR), which is a measure of correlative fluctuation between two probability densities, has been pursued for a number of quantum systems, such as, 1D quantum harmonic oscillator (QHO) and a few central potentials namely, 3D ... More
Quantum confinement in an asymmetric double-well potential through energy analysis and information entropic measureApr 12 2019Localization of a particle in the wells of an asymmetric double-well (DW) potential is investigated here. Information entropy-based uncertainty measures, such as Shannon entropy, Fisher information, Onicescu energy, etc., and phasespace area, are utilized ... More
Relative Fisher information in some central potentialsApr 04 2019Relative Fisher information (IR), which is a measure of correlative fluctuation between two probability densities, has been pursued for a number of quantum systems, such as, 1D quantum harmonic oscillator (QHO) and a few central potentials namely, 3D ... More
Some complexity measures in confined isotropic harmonic oscillatorApr 02 2019Various well-known statistical measures like \emph{L\'opez-Ruiz, Mancini, Calbet} (LMC) and \emph{Fisher-Shannon} complexity have been explored for confined isotropic harmonic oscillator (CHO) in composite position ($r$) and momentum ($p$) spaces. To ... More
Quantum mechanical virial-like theorem for confined quantum systemsApr 04 2019Confinement of atoms inside impenetrable (hard) and penetrable (soft) cavities has been studied for nearly eight decades. However, a unified virial theorem for such systems has not yet been found. Here we provide a general virial-like equation in terms ... More
Fisher information in confined isotropic harmonic oscillatorApr 04 2019Fisher information ($I$) is investigated in a confined harmonic oscillator (CHO) enclosed in a spherical enclosure, in conjugate $r$ and $p$ spaces. A comparative study between CHO and a free quantum particle in spherical box (PISB), as well as CHO and ... More
DFT calculations of atoms and molecules in Cartesian gridsApr 18 2019Density functional theory (DFT) has emerged as one of the most versatile and lucrative approaches in electronic structure calculations of many-electron systems in past four decades. Here we give an account of the development of a variational DFT method ... More
Information-Entropic Measures in Confined Isotropic Harmonic OscillatorApr 12 2019Information based uncertainty measures like R{\'e}nyi entropy (R), Shannon entropy (S) and Onicescu energy (E) (in both position and momentum space) are employed to understand the influence of radial confinement in isotropic harmonic oscillator. The transformation ... More
Spherically confined isotropic harmonic oscillatorFeb 02 2006The generalized pseudospectral Legendre method is used to carry out accurate calculations of eigenvalues of the spherically confined isotropic harmonic oscillator with impenetrable boundaries. The energy of the confined state is found to be equal to that ... More
Information entropy and complexity measure in generalized Kratzer potentialApr 12 2019Shannon entropy ($S$), Fisher information ($I$) and a measure equivalent to Fisher-Shannon complexity $(C_{IS})$ of a ro-vibrational state of diatomic molecules (O$_2$, O$_2^+$, NO, NO$^+$) with generalized Kratzer potential is analyzed. \emph{Exact} ... More
Information entropic measures of a quantum harmonic oscillator in symmetric and asymmetric confinement within an impenetrable boxApr 12 2019Information-based uncertainty measures like Shannon entropy, Onicescu energy and Fisher information (in position and momentum space) are employed to understand the effect of \emph{symmetric and asymmetric} confinement in a quantum harmonic oscillator. ... More
Ground and excited states of Li$^-$, Be$^-$ through a density-based approachJan 27 2010Density functional calculations are performed for ground [He]2s$^2$ $^1$S$^e$, and three metastable bound excited states, 1s2s2p$^2$ $^5$P$^e$, 1s2p$^3$ $^5$S$^o$, 1s2s2p3p $^5$P$^e$ of Li$^-$ and [He]2s2p$^2$ $^4$P$^e$, [He]2p$^3$ $^4$S$^o$, 1s2s2p$^3$ ... More
Various complexity measures in confined hydrogen atomJan 16 2018Several well-known statistical measures similar to \emph{LMC} and \emph{Fisher-Shannon} complexity have been computed for confined hydrogen atom in both position ($r$) and momentum ($p$) spaces. Further, a more generalized form of these quantities with ... More
Efficient HF exchange evaluation through Fourier convolution in Cartesian grid for orbital-dependent density functionalsNov 20 2018We present a purely numerical approach in Cartesian grid, for efficient computation of Hartree-Fock (HF) exchange contribution in the HF and density functional theory models. This takes inspiration from a recently developed algorithm [Liu \emph{et al.}, ... More
Bound state spectra of the 3D rational potentialApr 15 2010We present bound state spectra of the 3D rational potential, $V(r)=r^2 + \lambda r^2/(1+gr^2)$, $g>0$, by means of the generalized pseudospectral method. All the thirty states corresponding to $n$=0--9 are considered for the first time for a broad range ... More
Confinement in 3D polynomial oscillators through a generalized pseudospectral methodSep 08 2014Spherical confinement in 3D harmonic, quartic and other higher oscillators of even order is studied. The generalized pseudospectral method is employed for accurate solution of relevant Schr\"odinger equation in an \emph{optimum, non-uniform} radial grid. ... More
Bound states of the generalized spiked harmonic oscillatorJul 12 2013Bound states of the generalized spiked harmonic oscillator potential are calculated accurately by using the generalized pseudospectral method. Energy eigenvalues, various expectation values, radial densities are obtained through a nonuniform, optimal ... More
Spherical confinement of Coulombic systems inside an impenetrable box: H atom and the Hulthén potentialJan 18 2018The generalized pseudospectral method is employed to study spherical confinement in two simple Coulombic systems: (i) well celebrated and heavily studied H atom (ii) relatively less explored Hulth\'en potential. In both instances, arbitrary cavity size, ... More
Similarity Solutions For The Complex Burgers' HierarchyFeb 19 2019A detailed analysis of the invariant point transformations for the first four partial differential equations which belong to the Complex Burgers` Hierarchy is performed. Moreover, a detailed application of the reduction process through the Lie point symmetries ... More
Cheng Equation: A Revisit Through Symmetry AnalysisJan 11 2019The symmetry analysis of the Cheng Equation is performed. The Cheng Equation is reduced to a first-order equation of either Abel's Equations, the analytic solution of which is given in terms of special functions. Moreover, for a particular symmetry the ... More
Information-entropic measures in free and confined hydrogen atomJan 16 2018Shannon entropy ($S$), R{\'e}nyi entropy ($R$), Tsallis entropy ($T$), Fisher information ($I$) and Onicescu energy ($E$) have been explored extensively in both \emph{free} H atom (FHA) and \emph{confined} H atom (CHA). For a given quantum state, accurate ... More
Compressive deformation of Fe nanopillar : Modalities of dislocation dynamicsAug 03 2016Unlike the tensile mode, compressive deformation of a bcc metallic nanostructure is mediated by the glide of screw dislocation. Although the bcc screw dislocations are well known to possess unusual attributes, it is still unclear how these unique effects ... More
Quantum correction to thermodynamic properties of Li_2, Na_2 and Cs_2 dimersFeb 02 2018We have calculated the quantum correction(QC) in the vibrational partition function and thermodynamic state functions, e.g., internal energy, specific heat, free energy and entropy by using improved Manning-Rosen(MR) potential for Li_2, Na_2 and Cs_2 ... More
Second order splitting functions and infrared safe cross sections in $\mathcal{N}=4$ SYM theoryOct 17 2018We report our findings on the perturbative structure of ${\cal N}=4$ supersymmetric Yang-Mills (SYM) theory in the infrared sector by computing inclusive scattering cross sections of on-shell particles. We use half-BPS, energy-momentum tensor and Konishi ... More
Fisher information in confined hydrogen-like ionsNov 04 2017Fisher information (I) is investigated for confined hydrogen atom (CHA)-like systems in conjugate $r$ and $p$ spaces. A comparative study between CHA and free H atom (with respect to $I$) is pursued. In many aspects, inferences in CHA are significantly ... More
Scalable Probabilistic Models for 802.11 Protocol VerificationMar 31 2004May 05 2004The IEEE 802.11 protocol is a popular standard for wireless local area networks. Its medium access control layer (MAC) is a carrier sense multiple access with collision avoidance (CSMA/CA) design and includes an exponential backoff mechanism that makes ... More
A new proposal for glueball exploration in hard gluon fragmentationFeb 19 1999Jul 13 1999An unambiguous identification of glueballs in experiments will be of great significance, because their existence is an important test of QCD. The proposal, advanced here, is to experimentally search for glueballs as peaks in the invariant mass of a leading ... More
Soft Electromagnetic Radiations from Heavy Ion ColisionsMay 30 1997The production of low mass dileptons and soft photons from thermalized Quark Gluon Plasma (QGP) and hadronic matter in relativistic heavy ion collisions is evaluated. A boost invariant longitudinal and cylindrically symmetric transverse expansion of the ... More
Two-loop QCD corrections to $b + \bar{b} \rightarrow H+H$ amplitudeNov 05 2018We present the first results on the two-loop massless QCD corrections to the four-point amplitude $b+\overline{b} \rightarrow H+H$ in the five flavour scheme, treating bottom quarks as massless. This amplitude is sensitive to the trilinear Higgs boson ... More
Fragmentation contribution to quarkonium production in hadron collisionJun 24 1994We compute the contributions due to gluon and heavy-quark fragmentation to quarkonium production at large transverse momentum in $\bar p p$ and $p p$ collisions. For inclusive $J/\psi$ production, there is a large contribution from the $g \rightarrow ... More
Chaos in the Quantum Double Well Oscillator: The Ehrenfest View RevisitedAug 07 2001Aug 08 2001We treat the double well quantum oscillator from the standpoint of the Ehrenfest equation but in a manner different from Pattanayak and Schieve. We show that for short times there can be chaotic motion due to quantum fluctuations, but over sufficiently ... More
Non-Hermitian Quantum Mechanics with Minimal Length UncertaintyAug 12 2009We study non-Hermitian quantum mechanics in the presence of a minimal length. In particular we obtain exact solutions of a non-Hermitian displaced harmonic oscillator and the Swanson model with minimal length uncertainty. The spectrum in both the cases ... More
A Potential Model Approach in the Study of Static and Dynamic properties of Heavy-Light Quark-Antiquark SystemsNov 27 2016We report some approximate analytic form of meson wave function constructed upon solving Schrodinger equation with linear plus Coulomb type Cornell potential. With this wave function, we study Isgur-Wise function and its derivatives for heavy-light mesons ... More
Effective String Theory Inspired Potential and Meson Masses in Higher DimensionAug 08 2013Nov 27 2016Nambu-Goto action in classical bosonic string model for hadrons predicts quark-antiquark potential to be\cite{Nambu-Goto} $V(r)=-\frac{\gamma}{r}+\sigma r +\mu_0$. In this report we present studies of masses of heavy flavour mesons in higher dimension ... More
Nucleation and Growth of Droplets in Vapor-Liquid TransitionsMay 14 2013Results for the kinetics of vapor-liquid transitions, following temperature quenches with different densities, are presented from the molecular dynamics simulations of a Lennard-Jones system. For critical density, bicontinuous liquid and vapor domains ... More
Charged particle's $p_T$ spectra and elliptic flow in $\sqrt{s_{NN}}$=200 GeV Au+Au collisions: QGP vs. hadronic resonance gasSep 27 2010Jan 05 2011We show that if the hadronic resonance gas (HRG), with viscosity to entropy ratio $\eta/s\approx$0.24, is physical at temperature $T\approx$220 MeV, charged particles $p_T$ spectra and elliptic flow in Au+Au collisions at RHIC, over a wide range of collision ... More
Pseudo Hermitian formulation of Black-Scholes equationDec 14 2011We show that the non Hermitian Black-Scholes Hamiltonian and its various generalizations are eta-pseudo Hermitian. The metric operator eta is explicitly constructed for this class of Hamitonians. It is also shown that the effective Black-Scholes Hamiltonian ... More
Potential algebra approach to position dependent mass Schroedinger equationJul 29 2009It is shown that for a class of position dependent mass Schroedinger equation the shape invariance condition is equivalent to a potential symmetry algebra. Explicit realization of such algebras have been obtained for some shape invariant potentials.
Sparse Signal Recovery from Nonadaptive Linear MeasurementsOct 31 2013The theory of Compressed Sensing, the emerging sampling paradigm 'that goes against the common wisdom', asserts that 'one can recover signals in Rn from far fewer samples or measurements, if the signal has a sparse representation in some orthonormal basis', ... More
Photons from Jet - Plasma Interaction in collisional energy loss scenarioJun 03 2008Feb 07 2011We calculate photons from jet plasma interaction in a collisional energy loss scenario. It is shown that the PHENIX photon data is well reproduced when photons from initial hard collisions are taken into account.
Tetrahedral Bonding in Twisted Bilayer Graphene by Carbon IntercalationDec 19 2016Based on ab initio calculations, we study the effect of intercalating twisted bilayer graphene with carbon. Surprisingly, we find that the intercalant pulls the atoms in the two layers closer together locally when placed in certain regions in between ... More
A lattice based equation of state and $φ$ meson production in $\sqrt{s}$=6-200 GeV Pb+Pb and Au+Au collisionsNov 24 2009Jan 13 2010In a boost-invariant hydrodynamic model, we have analyzed $\phi$ meson production in Pb+Pb and Au+Au collisions, in the centre of mass energy range $\sqrt{s}$= 6-200 GeV. Hydrodynamic evolution is governed by a lattice based equation of state with a confinement-deconfinement ... More
Hadronic resonance gas and charged particle's $p_T$ spectra and elliptic flow in $\sqrt{s}$=200 GeV Au+Au collisionsJul 01 2010Sep 09 2010Charged particles $p_T$ spectra and elliptic flow in 0-60% Au+Au collisions at RHIC are analyzed in a hydrodynamic model with hot, hadronic resonance gas in the initial state. Physically conceivable hadronic resonance gas, thermalized in the time scale ... More
Fractal features in accretion discsFeb 28 2009Jul 23 2009Fractal concepts have been introduced in the accretion disc as a new feature. Due to the fractal nature of the flow, its continuity condition undergoes modifications. The conserved stationary fractal flow admits only saddle points and centre-type points ... More
Critical properties of spherically symmetric accretion in a fractal mediumApr 27 2007Jul 18 2007Spherically symmetric transonic accretion of a fractal medium has been studied in both the stationary and the dynamic regimes. The stationary transonic solution is greatly sensitive to infinitesimal deviations in the outer boundary condition, but the ... More
J/psi+gamma Production at the Tevatron EnergyJul 27 1994We study the process $\bar p p \rightarrow J/\psi + \gamma +X$ at the Tevatron energy ($\sqrt{s} = 1.8$~TeV). The perturbative QCD contributions to this process from the gluon-fusion and the fragmentation mechanisms are computed. For the entire range ... More
A Note on Intuitionistic Fuzzy Hypervector SpacesSep 11 2010The notion of Intuitionistic fuzzy hypervector space has been generalized and a few basic properties on this concept are studied. It has been shown that the intersection and union of an arbitrary family of Intuitionistic fuzzy hypervector spaces are also ... More
Transverse momentum spectra and elliptic flow in ideal hydrodynamics and geometric scalingMar 30 2010In an ideal hydrodynamic model, with an equation of state where the confinement-deconfinement transition is a cross-over at $T_{co}=196 MeV$, we have simulated $\sqrt{s}$=200 GeV Au+Au collisions. Simultaneous description of the experimental charged particle's ... More
2+1 dimensional hydrodynamics including bulk viscosity: a systematics studySep 08 2011Feb 21 2012We have studied the effect of nonzero bulk viscosity with peak near the lattice QCD predicted crossover temperature $T_{co}\sim 175 MeV$ on charged particle transverse momentum spectra and elliptic flow. The Israel-Stewart theory of 2nd order causal dissipative ... More
Lattice based equation of state and transverse momentum spectra of identified particles in ideal and viscous hydrodynamicsMar 05 2010Assuming that in Au+Au collisions, a baryon free fluid is produced, transverse momentum spectra of identified particles ($\pi$, $K$, $p$ and $\phi$), in evolution of ideal and viscous fluid is studied. Hydrodynamic evolution is governed by a lattice based ... More
An Improved Bound for Security in an Identity Disclosure ProblemJul 13 2018Identity disclosure of an individual from a released data is a matter of concern especially if it belongs to a category with low frequency in the data-set. Nayak et al. (2016) discussed this problem vividly in a census report and suggested a method of ... More
A possible resolution of the CDF psi^prime anomalySep 06 1994We consider the contribution of radially excited 2^3P_{1,2} states to psi^prime production at the Tevatron energy. Production of these states via the conventional gluon fusion mechanism and via gluon and charm quark fragmentation processes is considered. ... More
Exact solution of the Klein Gordon equation in the presence of a minimal lengthFeb 27 2009We obtain exact solutions of the (1+1) dimensional Klein Gordon equation with linear vector and scalar potentials in the presence of a minimal length. Algebraic approach to the problem has also been studied.
Constraints On Radiative Neutrino Mass Models From Oscillation DataNov 22 2001Dec 15 2001The three neutrino Zee model and its extension including three active and one sterile species are studied in the light of new neutrino oscillation data. We obtain analytical relations for the mixing angle in solar oscillations in terms of neutrino mass ... More
Extreme contractions in ${\cal L}(\ell^p_2, \ell^q_2)$ and the mazur intersection property in $\ell^p_2 \otimes_{\p} \ell^q_2$Dec 12 1994In this paper, we show that the projective tensor product of a two-dimen\-sional $\ell^p$ space with a two-dimensional $\ell^q$ space never has the Mazur Intersection Property for a large range of values of $p$ and $q$. For this purpose, we characterise ... More
Superheated drop neutron spectrometerMay 23 2000Superheated drops are known to detect neutrons through the nucleation caused by the recoil nuclei produced by the interactions of neutrons with the atoms constituting the superheated liquid molecule. A novel method of finding the neutron energy from the ... More
How high the temperature of a liquid be raised without boiling?Jul 28 2000How high the temperature of a liquid be raised beyond its boiling point without vaporizing (known as the limit of superheat) is an interesting subject of investigation. A new method of finding the limit of superheat of liquids is presented here. The superheated ... More
Superheated drop as a neutron spectrometerApr 17 2000Superheated drops are known to vaporise when exposed to energetic nuclear radiation since the discovery of bubble chamber. As the degree of superheat increases in a given liquid, less and less energetic neutrons are required to cause nucleation. This ... More
Photon sensitivity of superheated drop at room temperatureMay 15 2000It has been reported so far that superheated drop detector made of R-12 at room temperature are sensitive to neutrons yet insensitive to photons. This property makes its use as one of the most useful neutron dosimeter. The photon sensitivity of R12 at ... More
Study of nucleating efficiency of superheated droplets by neutronsApr 25 2000Superheated droplets are proven to be excelent detectors for neutrons and could be used as a neutron dosimeter. To detect accurately the volume of the vapour formed upon nucleation and hence to observe the nucleation quantitatively an air displacement ... More
Efficiency of neutron detection of superheated drops of Freon-22Apr 17 2000Neutron detection efficiency of superheated drops of Freon22 for neutrons obtained from a 3Ci Am-Be neutron source has been reported in this paper. Neutron detection efficiency of both F-22 and F-12 have been determined from the measured nucleation rate ... More
High spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi$_{1-x}$Nb$_x$O$_3$Mar 28 2019The physical systems with ferromagnetism and "bad" metallicity hosting unusual transport properties are playgrounds of novel quantum phenomena. Recently EuTi$_{1-x}$Nb$_x$O$_3$ emerged as a ferromagnetic system where non-trivial temperature dependent ... More
Probing Internal Stress and Crystallinity in Wet Foam via Raman SpectroscopyJun 04 2009In this article, we correlate the internal stress and the characteristics of a vibrational mode in wet foam. Using microscope images, we estimate the average size of the bubbles in wet foam, at specific time intervals, over a duration of twenty four hours. ... More
Poster: Improving Bug Localization with Report Quality Dynamics and Query ReformulationJul 20 2018Recent findings from a user study suggest that IR-based bug localization techniques do not perform well if the bug report lacks rich structured information such as relevant program entity names. On the contrary, excessive structured information such as ... More
An Insight into the Pull Requests of GitHubJul 05 2018Given the increasing number of unsuccessful pull requests in GitHub projects, insights into the success and failure of these requests are essential for the developers. In this paper, we provide a comparative study between successful and unsuccessful pull ... More
Impact of Continuous Integration on Code ReviewsJul 05 2018Peer code review and continuous integration often interleave with each other in the modern software quality management. Although several studies investigate how non-technical factors (e.g., reviewer workload), developer participation and even patch size ... More
Algorithms for computing mixed multiplicities, mixed volumes and sectional Milnor numbersFeb 20 2019We give Macaulay2 algorithms for computing mixed multiplicities of ideals in a polynomial ring. This enables us to find mixed volumes of lattice polytopes and sectional Milnor numbers of a hypersurface with an isolated singularity. The algorithms use ... More
Occultation observation to probe the turbulence scale size in the plasma tail of comet Schwassmann-Wachmann 3-BSep 10 2007Oct 10 2007We present the occultation observation of compact radio source B0019-000 through the plasma tail of comet Schwassmann-Wachmann 3-B. The observation was made with the Ooty Radio Telescope at 326.5 MHz on 2006 May 26, when the plasma tail of the comet was ... More
Cone Normed Linear SpacesSep 11 2010In this paper, we introduce cone normed linear space, study the cone convergence with respect to cone norm. Finally, we prove the completeness of a finite dimensional cone normed linear space.
Resonant Collisions in Four Dimensional Reversible Maps: A Description of ScenariosJun 06 1997We define a resonant collision of order k(geq 1) in a family of four-dimensional reversible maps. For any specified k, the bifurcation secnario is the collection of the different possible types of bifurcation of a symmetric fixed point that may be encountered ... More
Elliptic and Hexadecapole flow of charged hadron in viscous hydrodynamics with Glauber and Color Glass Condensate initial conditions for Pb-Pb collision at $\sqrt{s_{NN}}$=2.76 TeVOct 05 2012May 05 2013The experimentally measured elliptic ($v_{2}$) and hexadecapole ($v_{4}$) flow of charged particles as a function of transverse momentum ($p_{T}$) at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm NN}}$ = 2.76 TeV are compared with the relativistic ... More
Effect of anisotropy on HBT radii using leptonpair interferometryNov 10 2014The effect of initial state momentum-space anisotropy on invariant mass dependence of HBT radii extracted from the leptonpair interferometry is presented here. We have studied the Bose-Einstein Correlation Function (BECF) for two identical virtual photons ... More
Hair on non-extremal D1-D5 bound statesJul 19 2016Apr 28 2017We consider a truncation of type IIB supergravity on four-torus where in addition to the Ramond-Ramond 2-form field, the Ramond-Ramond axion (w) and the NS-NS 2-form field (B) are also retained. In the (w, B) sector we construct a linearised perturbation ... More
Fluctuation driven topological transition of binary condensates in optical latticesDec 01 2014We show the emergence of a third Goldstone mode in binary condensates at the phase-separation in quasi-1D optical lattices. We develop the coupled discrete nonlinear Schr\"odinger equations (DNLSEs) using Hartree-Fock-Bogoliubov theory with Popov approximation ... More
The Age of Information: Real-Time Status Updating by Multiple SourcesAug 30 2016Dec 12 2017We examine multiple independent sources providing status updates to a monitor through simple queues. We formulate an Age of Information (AoI) timeliness metric and derive a general result for the AoI that is applicable to a wide variety of multiple source ... More
Intense Ion Beam Neutralization Using Underdense Background PlasmaMar 11 2014Sep 09 2014Producing a dense background plasma for neutralization purposes is experimentally difficult and requires a large amount of energy. We show that even an underdense background plasma with a small relative density can achieve high neutralization of intense ... More
Role of magnetic interactions in neutron starsApr 26 2016In this work, we present a calculation of the non-Fermi liquid correction to the specific heat of magnetized degenerate quark matter present at the core of the neutron star. The role of non-Fermi liquid corrections to the neutrino emissivity has been ... More