Results for "Amlan K. Roy"

total 91151took 0.12s
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
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
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
Singularity Analysis of a Variant of the Painlev{é}--Ince EquationJun 03 2019We examine by singularity analysis an equation derived by reduction using Lie point symmetries from the Euler--Bernoulli Beam equation which is the Painlev\'{e}--Ince Equation with additional terms. The equation possesses the same leading-order behaviour ... 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
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
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
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
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
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
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
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
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
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
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
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
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
Critical parameters and spherical confinement of H atom in screened Coulomb potentialApr 25 2019Critical parameters in three screened potentials, namely, Hulth\'en, Yukawa and exponential cosine screened Coulomb potential are reported. Accurate estimates of these parameters are given for each of these potentials, for all states having $n \leq 10$. ... More
The Density of States of hole-doped Manganites: A Scanning Tunneling Microscopy/Spectroscopy studyJun 05 1998Variable temperature scanning tunneling microscopy/spectroscopy studies on single crystals and epitaxial thin films of hole-doped manganites, which show colossal magnetoresistance, have been done. We have investigated the variation of the density of states, ... 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
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
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
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
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
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
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
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
Information entropy as a measure of tunneling and quantum confinement in a symmetric double-well potentialApr 25 2019Information entropic measures such as Fisher information, Shannon entropy, Onicescu energy and Onicescu Shannon entropy of a symmetric double-well potential are calculated in both position and momentum space. Eigenvalues and eigenvectors of this system ... 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
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
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
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
Density functional electric response properties of molecules in Cartesian gridApr 25 2019Within the finite-field Kohn-Sham framework, static electric response properties of diatomic molecules are presented. The electronic energy, dipole moment ({\boldmath$\mu$}), static dipole polarizability ({\boldmath$\alpha$}) and first-hyperpolarizability ... 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
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
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
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
Static polarizability and hyperpolarizability in atoms and molecules through a Cartesian-grid DFTApr 25 2019Static electric response properties of atoms and molecules are reported within the real-space Cartesian grid implementation of pseudopotential Kohn-Sham (KS) density functional theory (DFT). A detailed systematic investigation is made for a representative ... More
The Curious Case of Leading Transcendentality: Three Point Form FactorsMay 29 2019Three-point form factors (FF) involving massless SU(N) coloured particles and a gauge invariant local operator are investigated for three different choices of operators in maximally supersymmetric Yang-Mills theory. The Higgs like operator is found to ... More
Properties of the ferrimagnetic double-perovskite A_{2}FeReO_{6} (A=Ba and Ca)Apr 08 1999Ceramics of A_{2}FeReO_{6} double-perovskite have been prepared and studied for A=Ba and Ca. Ba_{2}FeReO_{6} has a cubic structure (Fm3m) with $a\approx $8.0854(1) \AA whereas Ca_{2}FeReO_{6} has a distorted monoclinic symmetry with $a\approx 5.396(1) ... More
Collapse of the charge ordering gap of Nd_{0.5}Sr_{0.5}MnO_{3} in an applied magnetic fieldMar 06 1999Mar 27 1999We report results of tunneling studies on the charge ordering compound Nd_{0.5}Sr_{0.5}MnO_{3} in a magnetic field up to 6T and for temperature down to 25K.We show that a gap (2\Delta_{CO} \approx 0.5eV opens up in the density of state (DOS) at the Fermilevel ... More
Anomalous field-dependent specific heat in charge-ordered Pr$_{1-x}$Ca$_x$MnO$_3$ and La$_{0.5}$Ca$_{0.5}$MnO$_3$Apr 11 2000We report low temperature specific heat measurements of Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ ($0.3\leq x \leq 0.5$) and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ with and without applied magnetic field. An excess specific heat, $C^{\prime}(T)$, of non-magnetic origin associated ... More
Trajectory of a light ray in Kerr field: A material medium approachAug 14 2014Oct 16 2015The deflection of light ray as it passes around a gravitational mass can be calculated by different methods. Such calculations are generally done by using the null geodesics under both strong field and weak field approximation. However, several authors ... More
Study of Critical Dynamics in Fluid via Molecular Dynamics in Canonical EnsembleNov 25 2013Dec 04 2015With the objective of demonstrating usefulness of thermostats in the study of dynamic critical phenomena in fluids, we present results for transport properties in a binary Lennard-Jones fluid that exhibits liquid-liquid phase transition. Results from ... More
Dynamics and Growth of Droplets Close to the Two-Phase Coexistence Curve in FluidsMay 14 2013Results from the state-of-the-art molecular dynamics simulations are presented for both equilibrium and nonequilibrium dynamics following vapor-liquid transition in a single component Lennard-Jones system. We have fixed the overall density close to the ... More
A Higher Dimensional Potential Model Approach in the Study of Isgur-Wise Function for Heavy-Light MesonsJan 06 2013Apr 20 2013Nambu-Goto action of bosonic string predicts the quark-antiquark potential to be $ V (r) = \frac{\gamma}{r} + \sigma r +\mu_0 $. The coefficient$ \gamma = - \frac{\pi(d-2)}{24} $ is the universal L\"{u}scher coefficient of the L\"uscher term $ \frac{\gamma}{r}$, ... More
Transport Phenomena in Fluids: Finite-size scaling for critical behaviorNov 09 2010Results for transport properties, in conjunction with phase behavior and thermodynamics, are presented at the criticality of a binary Lennard-Jones fluid from Monte Carlo and molecular dynamics simulations. Evidence for much stronger finite-size effects ... More
A Note on Hypervector SpacesFeb 19 2010Jun 07 2011The main aim of this paper is to generalize the concept of vector space by the hyperstructure. We generalize some definitions such as hypersubspaces, linear combination, Hamel basis, linearly dependence and linearly independence. A few important results ... 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
Single domain to multi-domain transition due to in-plane magnetic anisotropy in phase separated (La$_{0.4}$Pr$_{0.6}$)$_{0.67}$Ca$_{0.33}$MnO$_{3}$ thin filmsOct 26 2010Phase separated perovskite manganites have competing phases with different crystal structures, magnetic and electronic properties. Hence, strain effects play a critical role in determining the magnetic properties of manganite thin films. Here we report ... 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
Simulation of Transport around the Coexistence Region of a Binary FluidDec 16 2014We use Monte Carlo and molecular dynamics simulations to study phase behavior and transport properties in a symmetric binary fluid where particles interact via Lennard-Jones potential. Our results for the critical behavior of collective transport properties, ... 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
Deflection of light ray due to a charged body using Material Medium ApproachAug 06 2015Jun 01 2017The gravitational deflection of light ray is an important prediction of General Theory of Relativity. In this paper we develop analytical expression of the deflection of light ray without any weak field approximation due to a charged gravitational body ... More
Effects of Domain Morphology on Kinetics of Fluid Phase SeparationMay 10 2013Kinetics of phase separation in a three dimensional single-component Lennard-Jones fluid, that exhibits vapor-liquid transition, is studied via molecular dynamics simulations after quenching homogeneous systems, of different overall densities, inside ... 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
Innerproduct HyperspacesSep 17 2010Jun 05 2011The main purpose of this paper is to generalize and develop a few basic properties of the innerproduct space on a hypervector space. On this hypervector space we define the norm. Also we establish a important relation between normed hyperspaces and innerproduct ... More
Finite-size Scaling Study of Shear Viscosity Anomaly at Liquid-Liquid CriticalityDec 16 2014We study equilibrium dynamics of a symmetrical binary Lennard-Jones fluid mixture near its consolute criticality. Molecular dynamics simulation results for shear viscosity, $\eta$, from microcanonical ensemble are compared with those from canonical ensemble ... More
An Improved analysis of Isgur-Wise Function for Heavy Light Mesons in $D$ dimensional Potential ModelAug 08 2013This letter reports some improvement of the formalism and analysis of our very recent work \cite{SR1} on the studies of Isgur-Wise function for heavy-light mesons following higher dimensional string inspired potential model.
An Efficient Biological Sequence Compression Technique Using LUT And Repeat In The SequenceSep 26 2012Nov 11 2012Data compression plays an important role to deal with high volumes of DNA sequences in the field of Bioinformatics. Again data compression techniques directly affect the alignment of DNA sequences. So the time needed to decompress a compressed sequence ... 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
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
W-TALC: Weakly-supervised Temporal Activity Localization and ClassificationJul 27 2018Dec 15 2018Most activity localization methods in the literature suffer from the burden of frame-wise annotation requirement. Learning from weak labels may be a potential solution towards reducing such manual labeling effort. Recent years have witnessed a substantial ... More
Electrostatic acoustic modes in a self-gravitating complex plasma with variable charge impuritiesJan 08 2005A linear theory of dust acoustic (DA) and dust ion-acoustic (DIA) waves in a self-gravitating collisional dusty plasma contaminated by variable-charge impurities is presented for a self-consistent closed system. The ion-drag force arising from the ion ... 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
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
Incorporating Scalability in Unsupervised Spatio-Temporal Feature LearningAug 06 2018Aug 15 2018Deep neural networks are efficient learning machines which leverage upon a large amount of manually labeled data for learning discriminative features. However, acquiring substantial amount of supervised data, especially for videos can be a tedious job ... More
Eakin-Sathaye type theorems for joint reductions and good filtrations of idealsJun 20 2018Analogues of Eakin-Sathaye theorem for reductions of ideals are proved for ${\mathbb N}^s$-graded good filtrations. These analogues yield bounds on joint reduction vectors for a family of ideals and reduction numbers for $\mathbb N$-graded filtrations. ... 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
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
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
Effective Reformulation of Query for Code Search using Crowdsourced Knowledge and Extra-Large Data AnalyticsJul 23 2018Software developers frequently issue generic natural language queries for code search while using code search engines (e.g., GitHub native search, Krugle). Such queries often do not lead to any relevant results due to vocabulary mismatch problems. In ... More
Kinetics of Fluid Phase SeparationJan 22 2015We review understanding of kinetics of fluid phase separation in various space dimensions. Morphological differences, percolating or disconnected, based on overall composition in a binary liquid or density in a vapor-liquid system, have been pointed out. ... More
STRICT: Information Retrieval Based Search Term Identification for Concept LocationJul 12 2018During maintenance, software developers deal with numerous change requests that are written in an unstructured fashion using natural language. Such natural language texts illustrate the change requirement involving various domain related concepts. Software ... More
QUICKAR: Automatic Query Reformulation for Concept Location using Crowdsourced KnowledgeJul 09 2018During maintenance, software developers deal with numerous change requests made by the users of a software system. Studies show that the developers find it challenging to select appropriate search terms from a change request during concept location. In ... More
SurfClipse: Context-Aware Meta Search in the IDEJul 06 2018Despite various debugging supports of the existing IDEs for programming errors and exceptions, software developers often look at web for working solutions or any up-to-date information. Traditional web search does not consider the context of the problems ... More
Coherent states of P{ö}schl-Teller potential and their revival dynamicsNov 09 2004Mar 09 2007A recently developed algebraic approach for constructing coherent states for solvable potentials is used to obtain the displacement operator coherent state of the P\"{o}schl-Teller potential. We establish the connection between this and the annihilation ... More
Molecular Nanostructures on the Surface of a d_(x2-y2)-SuperconductorOct 27 2004We study molecular nanostructures on the surface of a d_(x2-y2)-wave superconductor. We show that the interplay between the molecular nanostructure's internal excitation spectrum and quantum interference of the scattered host electrons leads to a series ... More
Quasi-Exact Solvability and Deformations of Sl(2) AlgebraApr 08 2013Algebraic structure of a class of differential equations including Heun is shown to be related with the deformations of sl(2) algebra. These include both quadratic and cubic ones. The finite dimensional representation of cubic algebra is explicitly shown ... More
An Effective $p_T$ Cutoff for the Isolalated Lepton Background from Bottom Decay --May 28 1993There is a strong correlation between the $p_T$ and isolation of the lepton coming from $B$ decay. Consequently the isolated lepton background from $B$ decay goes down rapidly with increasing lepton $p_T$; and there is a $p_T$ cutoff beyond which it effectively ... More
Improving IR-Based Bug Localization with Context-Aware Query ReformulationAug 01 2018Recent findings suggest that Information Retrieval (IR)-based bug localization techniques do not perform well if the bug report lacks rich structured information (eg relevant program entity names). Conversely, excessive structured information (eg stack ... More
Recommending Relevant Sections from a Webpage about Programming Errors and ExceptionsJul 06 2018Programming errors or exceptions are inherent in software development and maintenance, and given today's Internet era, software developers often look at web for finding working solutions. They make use of a search engine for retrieving relevant pages, ... More