Results for "A. Sharma"

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Ferromagnetism in multi-band Kondo lattice modelAug 06 2008The ferromagnetic spin exchange interaction between the itinerant electrons and localized moments on a periodic lattice, studied within the so-called Kondo lattice model (KLM), is considered for multiband situation where the hopping integral is a matrix, ... More
Temperature dependent electronic correlation effects in GdNJun 26 2006We investigate temperature dependent electronic correlation effects in the conduction bands of Gadolinium Nitride (GdN) based on the combination of many body analysis of the multi-band Kondo lattice model and the first principles TB-LMTO bandstructure ... More
Correlation effects in the valence bands of ferromagnetic semiconductor EuSDec 28 2005We present a many body analysis of the multi-band Kondo lattice model. The study is then combined with the first principles TB-LMTO band structure calculations, in order to investigate the temperature dependent correlation effects in the 3$\textit{p}$ ... More
Model Reduction of Turbulent Fluid Flows Using the Supply RateJan 21 2013A method for finding reduced-order approximations of turbulent flow models is presented. The method preserves bounds on the production of turbulent energy in the sense of the $\curly{L}_2$ norm of perturbations from a notional laminar profile. This is ... More
Templeting of Thin Films Induced by Dewetting on Patterned SurfacesJan 25 2001The instability, dynamics and morphological transitions of patterns in thin liquid films on periodic striped surfaces (consisting of alternating less and more wettable stripes) are investigated based on 3-D nonlinear simulations that account for the inter-site ... More
Stability of drift waves in a field reversed configurationNov 07 2008The drift waves in field-reversed configurations without a toroidal magnetic field, therefore no shear, play an important role in plasma transport. The short connection length of the poloidal field in these systems leads to significant stabilization by ... More
Three-Quark Bethe-Salpeter Vertex Function Under Pairwise Gluon-Exchange-Like Interaction : Application to n-p Mass DifferenceJul 29 1997A qqq BSE formalism based on an input 4-fermion Lagrangian of `current' u,d quarks, is employed for the construction of a relativistic qqq-wave function) via the BSE. Chiral invariance is ensured by the vector character of the gluonic propagator in the ... More
On a Class of Warped Product Submanifold in a Lorentzian Paracosymplectic ManifoldSep 24 2016Recently Y{\"u}ksel et. al. \cite{SY} shows that there doesn't exist any proper semi-slant warped product submanifolds in a Lorentzian paracosymplectic manifold. In the present article, we first define and give preparatory lemmas for a new generalize ... More
Pointwise Semi-Slant Warped Product Submanifold in a Lorentzian Paracosymplectic ManifoldSep 24 2016Jun 22 2017Recently Y{\"u}ksel et. al. \cite{SY} shows that there doesn't exist any proper semi-slant warped product submanifolds in a Lorentzian paracosymplectic manifold. In the present article, we first define and give preparatory lemmas for a new generalize ... More
Green-Kubo approach to the average swim speed in active Brownian systemsAug 29 2016We develop an exact Green-Kubo formula relating nonequilibrium averages in systems of interacting active Brownian particles to equilibrium time-correlation functions. The method is applied to calculate the density-dependent average swim speed, which is ... More
The de Almeida-Thouless line in vector spin glassesMar 29 2010Mar 30 2010We consider the infinite-range spin glass in which the spins have m > 1 components (a vector spin glass). Applying a magnetic field which is random in direction, there is an Almeida Thouless (AT) line below which the "replica symmetric" solution is unstable, ... More
Geometry of pointwise pseudo-slant warped product submanifolds in a Kähler manifoldDec 10 2015May 20 2016The purpose of this paper is to study pointwise pseudo-slant warped product submanifolds of a K\"{a}hler manifold $\widetilde{M}$. We derive the conditions of integrability and totally geodesic foliation for the distributions allied to the characterization ... More
Analysing Word Importance for Image AnnotationJun 20 2013Image annotation provides several keywords automatically for a given image based on various tags to describe its contents which is useful in Image retrieval. Various researchers are working on text based and content based image annotations [7,9]. It is ... More
Polymer Nanocomposites: synthesis and characterizationJul 10 2018This chapter deals with the fundamental properties of polymer nanocomposites (PNC) and their characteristics that play a significant role in deciding their capability for the advanced energy storage device. The various synthesization methods used for ... More
Transit universe with time varying $G$ and decaying $Λ$Aug 19 2012Sep 16 2012We present the model of transit universe from early deceleration phase to current acceleration phase under the framework of general relativity in presence of gravitational coupling $G(t)$ and cosmological terms $\Lambda(t)$. The Einstein's field equations ... More
On the Generalized Class of $\mathcal{P}\mathcal{R}$-warped product submanifolds in para-Kähler ManifoldsMay 09 2018In this paper, we study a new generalized class of $\mathcal{P}\mathcal{R}$-warped product submanifolds under the name $\mathcal{P}\mathcal{R}$-pseudo-slant warped product submanifolds in para-K\"{a}hler manifolds $\bar{M}$. The results of existence and ... More
Scalable Energy Efficient Location Aware Multicast Protocol for MANET (SEELAMP)May 21 2010Jun 04 2010Multicast plays an important role in implementing the group communications in bandwidth scarce multihop mobile ad hoc networks. However, due to the dynamic topology of MANETs it is very difficult to build optimal multicast trees and maintaining group ... More
Effect of Salt Concentration on Dielectric Properties of Li-Ion Conducting Blend Polymer ElectrolytesAug 20 2018In the present article, we have studied the effect of the salt concentration (LiPF6) on transport properties and ion dynamics of blend solid polymer electrolyte (PEO PAN) prepared by solution cast technique. Fourier transform infrared (FTIR) spectroscopy ... More
Insights into the use of polyethylene oxide in energy storage/conversion devices: A critical reviewJul 11 2018In this review, latest updates in the poly (ethylene oxide) based electrolytes are summarized. The ultimate goal of researchers globally is towards the development of free standing solid polymeric separator for energy storage devices. This single free ... More
Categorification of Dijkgraaf-Witten TheoryNov 01 2015Feb 09 2016The goal of the paper is to categorify Dijkgraaf-Witten theory, aiming at providing foundation for a direct construction of Dijkgraaf-Witten theory as an Extended Topological Quantum Field Theory. The main tool is cohomology with coefficients in a Picard ... More
Sodium-Ion-Conducting Polymer Nanocomposite Electrolyte of TiO2/PEO/PAN Complexed with NaPF6Aug 23 2018A free standing transparent film of solid state polymer electrolyte based on PEO/PAN + NaPF6 with different compositions of nano sized TiO2 in weight percent (x = 0, 1, 2, 5, 10, 15, 20 ) is synthesized by using standard solution cast technique. The homogeneous ... More
Means Moments and Newton's InequalitiesFeb 15 2017It is shown that Newton's inequalities and the related Maclaurin's inequalities provide several refinements of the fundamental Arithmetic mean - Geometric mean - Harmonic mean inequality in terms of the means and variance of positive real numbers. We ... More
Efficient proton acceleration from laser-driven cryogenic hydrogen target of various shapesSep 19 2017Jan 22 2018We theoretically investigate high energy, collimated proton beam with three dimensional particle in cell simulations of ultrashort petawatt laser interaction with cryogenic hydrogen target of various shapes. Here we show that under appropriate conditions ... More
Escape rate of transiently active Brownian particle in one dimensionFeb 08 2019Activity significantly enhances the escape rate of a Brownian particle over a potential barrier. Whereas constant activity has been extensively studied in the past, little is known about the effect of time-dependent activity on the escape rate of the ... More
Higher order antibunching in intermediate statesJun 05 2007Since the introduction of binomial state as an intermediate state, different intermediate states have been proposed. Different nonclassical effects have also been reported in these intermediate states. But till now higher order antibunching or higher ... More
On coherent structure in wall turbulenceJan 31 2013Jun 17 2013A new theory of coherent structure in wall turbulence is presented. The theory is the first to predict packets of hairpin vortices and other structure in turbulence, and their dynamics, based on an analysis of the Navier-Stokes equations, under an assumption ... More
A critical layer model for turbulent pipe flowJan 18 2010A model-based description of the scaling and radial location of turbulent fluctuations in turbulent pipe flow is presented and used to illuminate the scaling behaviour of the very large scale motions. The model is derived by treating the nonlinearity ... More
The metastable minima of the Heisenberg spin glass in a random magnetic fieldJul 16 2016Nov 30 2016We have studied zero temperature metastable states in classical $m$-vector component spin glasses in the presence of $m$-component random fields (of strength $h_{r}$) for a variety of models, including the Sherrington Kirkpatrick (SK) model, the Viana ... More
An Intelligent Mobile-Agent Based Scalable Network Management Architecture for Large-Scale Enterprise SystemFeb 09 2012Several Mobile Agent based distributed network management models have been proposed in recent times to address the scalability and flexibility problems of centralized (SNMP or CMIP management models) models. Though the use of Mobile Agents to distribute ... More
Presence Factor-Oriented Blog SummarizationFeb 28 2013The research that has been carried out on blogs focused on blog posts only, ignoring the title of the blog page. Also, in summarization only a set of representative sentences are extracted. Some analysis has been done and it has been found that the blog ... More
Reply to Comment on "Anomalous Discontinuity at the Percolation Critical Point of Active Gels"May 10 2016In this reply we discuss definition and estimation of the Fisher exponent in the no-enclaves percolation (NEP) model.
Pros & Cons of Model-based Bandwidth Control for Client-assisted Content DeliverySep 25 2012A key challenge in \cacd\ is determining how to allocate limited server bandwidth across a large number of files being concurrently served so as to optimize global performance and cost objectives. In this paper, we present a comprehensive experimental ... More
Development of Novel Cathode Materials based on MWCNT for Energy Storage/Conversion DevicesJul 14 2018Novel compound comprising of Li2FexMn(1-x)SiO4/MWCNT were prepared by using Sol-Gel technique. In this study, improved electrochemical properties are observed by substituting Fe to replace Mn. and further multiwalled carbon nano tubes are used to prepare ... More
Effect of lithium bis(oxalato)borate on the Structural, microstructural and electrochemical properties of blend solid polymer electrolyteJul 04 2018Blend solid polymer electrolyte based on PEO, PVP complexed with lithium LiBOB were synthesized by solution cast technique and impact of LiBOB on the morphology, structure, and electrochemical properties is examined. The XRD and FESEM analysis reveals ... More
Effect of Variation of Different Nano filler on Structural, Electrical, Dielectric and Transport Properties of Blend Polymer NanocompositesJul 10 2018In the present work, the effect of different nanofiller (BaTiO3, CeO2, Er2O3 or TiO2) on blend solid polymer electrolyte comprising of PEO and PVC complexed with bulky LiPF6 have been explored. The XRD analysis confirms the polymer nanocomposite formation. ... More
Band-pass Fabry-Pèrot magnetic tunnel junctionsJan 29 2018Significant scientific and technological progress in the field of spintronics is based on trilayer magnetic tunnel junction devices which principally rely on the physics of single barrier tunneling. While technologically relevant devices have been prototyped, ... More
Resonant spin transfer torque nano-oscillatorsFeb 07 2017Spin transfer torque nano-oscillators are potential candidates for replacing the traditional inductor based voltage controlled oscillators in modern communication devices. Typical oscillator designs are based on trilayer magnetic tunnel junctions which ... More
Role of intergranular silver in modulating the aperiodicity in disordered Josephson junction arrays : impact on relaxation of intergranular critical stateNov 27 2000Relaxation of the intergranular critical state has been observed at a very low applied magnetic field (10-50 Oe) over a temperature regime of 20-77 K in bulk polycrystalline YBa(2)Cu(3)O(7-x) (YBCO) and Bi(1.75)Pb(0.35)Sr(2)Ca(2)Cu(3)O(10+x) (BPSCCO) ... More
All-optical switching with bacteriorhodopsinOct 09 2003All-optical, mirrorless switching and bistability is demonstrated with bacteriorhodopsin (bR). A low-power, 532 nm laser beam modulates the transmission of a cw laser beam at 635 nm that corresponds to peak absorption of the O-excited state in the bR ... More
Scaling and interaction of self-similar modes in models of high-Reynolds number wall turbulenceSep 22 2016Previous work has established the usefulness of the resolvent operator that maps the terms nonlinear in the turbulent fluctuations to the fluctuations themselves. Further work has described the self-similarity of the resolvent arising from that of the ... More
A Novel Architecture for Relevant Blog Page IdentifcationJul 31 2013Blogs are undoubtedly the richest source of information available in cyberspace. Blogs can be of various natures i.e. personal blogs which contain posts on mixed issues or blogs can be domain specific which contains posts on particular topics, this is ... More
Steady streamwise transpiration control in turbulent pipe flowJun 15 2016A study of the the main features of low- and high amplitude steady streamwise wall transpiration applied to pipe flow is presented. The effect of the two transpiration parameters, amplitude and wavenumber, on the flow have been investigated by means of ... More
Predicting structural and statistical features of wall turbulenceDec 02 2010The majority of practical flows, particularly those flows in applications of importance to transport, distribution and climate, are turbulent and as a result experience complex three-dimensional motion with increased drag compared with the smoother, laminar ... More
Trading beams for bandwidth: Imaging with randomized beamformingJan 31 2019We study the problem of actively imaging a range-limited far-field scene using an antenna array. We describe how the range limit imposes structure in the measurements across multiple wavelengths. This structure allows us to introduce a novel trade-off: ... More
An inequality connecting entropy distance, Fisher Information and large deviationsDec 11 2018In this paper we introduce a new generalisation of the relative Fisher Information for Markov jump processes on a finite or countable state space, and prove an inequality which connects this object with the relative entropy and a large deviation rate ... More
Scheduling Chained Multiprocessor Tasks onto Large Multiprocessor SystemAug 12 2015In this paper, we proposed an effective approach for scheduling of multiprocessor unit time tasks with chain precedence on to large multiprocessor system. The proposed longest chain maximum processor scheduling algorithm is proved to be optimal for uniform ... More
Transient growth mechanisms of low Reynolds number flow over a low-pressure turbine bladeFeb 12 2013A direct transient growth analysis for three-dimensional perturbations to flow past a periodic array of T-106/300 low-pressure turbine fan blades is presented. The methodology is based on a singular value decomposition of the flow evolution operator, ... More
Elastic response of filamentous networks with compliant crosslinksSep 16 2013Experiments have shown that elasticity of disordered filamentous networks with compliant crosslinks is very different from networks with rigid crosslinks. Here, we model and analyze filamentous networks as a collection of randomly oriented rigid filaments ... More
Resource Allocation in a MAC with and without security via Game Theoretic LearningJul 05 2016In this paper a $K$-user fading multiple access channel with and without security constraints is studied. First we consider a F-MAC without the security constraints. Under the assumption of individual CSI of users, we propose the problem of power allocation ... More
Estimation of unsteady aerodynamic forces using pointwise velocity dataJun 15 2016A novel method to estimate unsteady aerodynamic force coefficients from pointwise velocity measurements is presented. The methodology is based on a resolvent-based reduced-order model which requires the mean flow to obtain physical flow structures and ... More
A framework for studying the effect of compliant surfaces on wall turbulenceNov 25 2014Feb 05 2015This paper extends the resolvent formulation proposed by McKeon & Sharma (2010) to consider turbulence-compliant wall interactions. Under this formulation, the turbulent velocity field is expressed as a linear superposition of propagating modes, identified ... More
A Novel Architecture For Question Classification Based Indexing Scheme For Efficient Question AnsweringJul 26 2013Question answering system can be seen as the next step in information retrieval, allowing users to pose question in natural language and receive compact answers. For the Question answering system to be successful, research has shown that the correct classification ... More
Robust broad spectral photodetection (UV-NIR) and ultra high responsivity investigated in nanosheets and nanowires of Bi2Te3 under harsh nano-milling conditionsDec 20 2017Dec 21 2017Due to miniaturization of device dimensions, the next generations photodetector based devices are expected to be fabricated from robust nanostructured materials. Hence there is an utmost requirement of investigating exotic optoelectronic properties of ... More
On the design of optimal compliant walls for turbulence controlApr 19 2016This paper employs the theoretical framework developed by Luhar et al. (J. Fluid Mech., 768, 415-441) to consider the design of compliant walls for turbulent skin friction reduction. Specifically, the effects of simple spring-damper walls are contrasted ... More
$\mathcal{P}\mathcal{R}$-anti-slant warped product submanifold of a nearly paracosymplectic manifoldOct 06 2015Mar 03 2016In this paper, we study $\mathcal{P}\mathcal{R}$-anti-slant warped product submanifold of a nearly paracosymplectic manifold $\widetilde{M}$. The necessary and sufficient condition is obtained for the distributions allied to the characterization of a ... More
Isospectral Potentials and Quarkonia Low Energy Spectra: A Possibility of simultaneous fit to Masses and leptonic decay widths"Oct 20 2008Some of the non-relativistic QQ/bar interaction potentials and its isospectral partner-potentials have been employed to evaluate the masses and leptonic decay widths of Charmonium and Upsilon states. An attempt has been made to develop a prescription ... More
Thermal Expansion Coefficients of Bi$_2$Se$_3$ and Sb$_2$Te$_3$ Crystals from 10 K to 270 KDec 07 2011Dec 30 2011Lattice constant of Bi$_2$Se$_3$ and Sb$_2$Te$_3$ crystals is determined by X-ray powder diffraction measurement in a wide temperature range. Linear thermal expansion coefficients ($\alpha$) of the crystals are extracted, and considerable anisotropy between ... More
The Weierstrass Representation always gives a minimal surfaceAug 28 2012We give a simple, direct proof of the easy fact about the Weierstrass Representation, namely, that it always gives a minimal surface. Most presentations include the much harder converse that every simply connected minimal surface is given by the Weierstrass ... More
Operator spaces which are one-sided M-Ideals in their bidualFeb 24 2009Jun 30 2009We generalize an important class of Banach spaces, namely the $M$-embedded Banach spaces, to the non-commutative setting of operator spaces. The one-sided $M$-embedded operator spaces are the operator spaces which are one-sided $M$-ideals in their second ... More
Real Operator Algebras and Real Completely Isometric TheoryNov 21 2012This paper is a continuation of the program started by Ruan in 2003, of developing real operator space theory. In particular, we develop the theory of real operator algebras. We also show among other things that the injective envelope, C*-envelope and ... More
Direct measurement of electron numbers created at infrared laser-induced ionization of various gasesOct 15 2018Nov 21 2018In this work, we present temporally resolved measurements of electron numbers created at photoionization of various gases by femtosecond laser pulse at 800 nm wavelength. The experiments were conducted in $O_2$, $Xe$, $Ar$, $N_2$, $Kr$ and $CO$ at room ... More
Temperature dependence of Raman-active optical phonons in Bi_2Se_3 and Sb_2Te_3Dec 06 2011Inelastic light scattering spectra of Bi_2Se_3 and Sb_2Te_3 single crystals have been measured over the temperature range from 5 K to 300 K. The temperature dependence of dominant A^{2}_{1g} phonons shows similar behavior in both materials. The temperature ... More
Enhanced excitonic effects in the energy loss spectra of LiF and Ar at large momentum transferApr 12 2012It is demonstrated that the bootstrap kernel [\onlinecite{sharma11}] for finite values of ${\bf q}$ crucially depends upon the matrix character of the kernel and gives results of the same good quality as in the ${\bf q} \rightarrow 0$ limit. The bootstrap ... More
Symmetric monoidal categories and $Γ$-categoriesNov 28 2018In this paper we construct a symmetric monoidal closed model category of coherently commutative monoidal categories. The main aim of this paper is to establish a Quillen equivalence between a model category of coherently commutative monoidal categories ... More
Foreground Clustering for Joint Segmentation and Localization in Videos and ImagesNov 26 2018This paper presents a novel framework in which video/image segmentation and localization are cast into a single optimization problem that integrates information from low level appearance cues with that of high level localization cues in a very weakly ... More
Dynamics Estimation Using Recurrent Neural NetworkSep 17 2018There is a plenty of research going on in field of robotics. One of the most important task is dynamic estimation of response during motion. One of the main applications of this research topics is the task of pouring, which is performed daily and is commonly ... More
Reanalyzing variable directionality of gene expression in transgenerational epigenetic inheritanceJun 28 2016A previous report claimed no evidence of transgenerational epigenetic inheritance in a mouse model of in utero environmental exposure, based on the observation that gene expression changes observed in the germ cells of G1 and G2 male fetus were not in ... More
Susceptibilities for the Müller-Hartmann-Zitartz countable infinity of phase transitions on a Cayley treeJan 29 2015Jul 23 2015We obtain explicit susceptibilities for the countable infinity of phase transition temperatures of M\"{u}ller-Hartmann-Zitartz on a Cayley tree. The susceptibilities are a product of the zeroth spin with the sum of an appropriate set of averages of spins ... More
A Two Step Perspective for Kripke Structure ReductionOct 01 2012This paper presents a novel theoretical framework for the state space reduction of Kripke structures. We define two equivalence relations, Kripke minimization equivalence (KME) and weak Kripke minimization equivalence (WKME). We define the quotient system ... More
Handwritten digit Recognition using Support Vector MachineMar 17 2012Handwritten Numeral recognition plays a vital role in postal automation services especially in countries like India where multiple languages and scripts are used Discrete Hidden Markov Model (HMM) and hybrid of Neural Network (NN) and HMM are popular ... More
On the homotopy theory of $\mathbf{G}$ - spacesDec 11 2015The aim of this paper is to show that the most elementary homotopy theory of $\mathbf{G}$-spaces is equivalent to a homotopy theory of simplicial sets over $\mathbf{BG}$, where $\mathbf{G}$ is a fixed group. Both homotopy theories are presented as Relative ... More
XPM nonlinearities:Are all involved photons real?Sep 05 2011May 01 2016We have found a novel symmetry for XPM(Cross Phase Modulation) systems .We prove that this symmetry is a necessary condition for a single multiphoton process to be visible in more than one field.We have found, two EIT(Electromagnetically Induced Transparency) ... More
Verified Subtyping with Traits and MixinsJul 15 2014Traits allow decomposing programs into smaller parts and mixins are a form of composition that resemble multiple inheritance. Unfortunately, in the presence of traits, programming languages like Scala give up on subtyping relation between objects. In ... More
End to End Verification and Validation with SPINFeb 20 2013Over the last several years the tools used for model checking have become more efficient and usable. This has enabled users to apply model checking to industrial-scale problems, however the task of validating the implementation of the model is usually ... More
Necessary and Probably Sufficient Test for Finding Valid Instrumental VariablesDec 04 2018Can instrumental variables be found from data? While instrumental variable (IV) methods are widely used to identify causal effect, testing their validity from observed data remains a challenge. This is because validity of an IV depends on two assumptions, ... More
State Classification with CNNJun 05 2018Jun 25 2018There is a plenty of research going on in field of object recognition, but object state recognition has not been addressed as much. There are many important applications which can utilize object state recognition, such as, in robotics, to decide for how ... More
One Shot Joint Colocalization and CosegmentationMay 17 2017This paper presents a novel framework in which image cosegmentation and colocalization are cast into a single optimization problem that integrates information from low level appearance cues with that of high level localization cues in a very weakly supervised ... More
An Empirical Study of Path Feasibility QueriesFeb 20 2013In this paper we present a comparative study of path feasibility queries generated during path exploration based software engineering methods. Symbolic execution based methods are gaining importance in different aspects of software engineering e.g. proving ... More
Construction of self-dual codes over $\mathbb{Z}_{2^m}$Jul 14 2014Self-dual codes (Type I and Type II codes) play an important role in the construction of even unimodular lattices, and hence in the determination of Jacobi forms. In this paper, we construct both Type I and Type II codes (of higher lengths) over the ring ... More
Weak Hadronic decays of Charmed Baryons and Current-Algebra SchemeOct 22 2008The weak decay of charmed baryons multiplets into ground state and mesons are investigated using current algebra technique. Some of the interesting results on the partial decays rates and the asymmetry parameters for $\Delta$C=$\Delta$S=-1 the mode are ... More
MacWilliams type identities for some new $m$-spotty weight enumeratorsSep 17 2011Nov 11 2011Past few years have seen an extensive use of high-density RAM chips with wide I/O data (e.g., 16, 32, 64 bits) in computer memory systems. These chips are highly vulnerable to a special type of byte error, called an $m$-spotty byte error, which can be ... More
Asymptotic Optimality of Constant-Order Policies for Lost Sales Inventory Models with Large Lead TimesNov 16 2012Sep 03 2014Lost sales inventory models with large lead times, which arise in many practical settings, are notoriously difficult to optimize due to the curse of dimensionality. In this paper we show that when lead times are large, a very simple constant-order policy, ... More
Anomalous Self-Energy Effects of the B_1g Phonon in Y_{1-x}(Pr,Ca)_xBa_2Cu_3O_7 FilmsAug 25 1999In Raman spectra of cuprate superconductors the gap shows up both directly, via a redistribution of the electronic background, the so-called "2Delta peaks", and indirectly, e.g. via the renormalization of phononic excitations. We use a model that allows ... More
Winds of change: reionization by starburst galaxiesJun 28 2016We investigate the properties of the galaxies that reionized the Universe and the history of cosmic reionization using the "Evolution and Assembly of GaLaxies and their environments" (EAGLE) cosmological hydrodynamical simulations. We obtain the evolution ... More
Mass functions and photometric binaries in nine open clustersMar 02 2008Using homogeneous CCD photometric data from the 105-cm Kiso Schmidt telescope covering a 50' x 50' field, we study the mass functions (MFs) of nine open clusters. The ages and Galactocentric distances of the target clusters vary from 16 - 2000 Myr and ... More
Chemical potential in disordered organic materialsJun 21 2012Charge carrier mobility in disordered organic materials is being actively studied, motivated by several applications such as organic light emitting diodes and organic field-effect transistors. It is known that the mobility in disordered organic materials ... More
\textit{Additional} carrier-mediated ferromagnetism in GdNFeb 07 2010The mechanism behind ferromagnetic exchange interaction in GdN is not well understood. It has been argued that it can be due to fourth order cross process of \textit{d-f} mixing and \textit{d-f} exchange. An alternative explanation suggests an anti- ferromagnetic ... More
Structural, Vibrational, Elastic and Topological Properties of PaN Under PressureAug 14 2013Electronic, structural, vibrational and elastic properties of PaN have been studied both at ambient and high pressures, using first principles methods with several commonly used parameterizations of the exchange-correlation energy. The generalized gradient ... More
Closed-form Approximations for Coverage and Rate in a Multi-tier Heterogeneous Network in Nakagami-m FadingApr 25 2016In this paper, we consider the downlink in a K-tier heterogeneous network in the presence of Nakagami-m fading and noise. For such a system, we derive closed-form approximations of coverage probability and average rate achievable. A piece-wise linear ... More
Giant magnetocaloric effect near room temperature in the off-stoichiometric Mn-Co-Ge alloyMay 10 2016We report a giant magnetocaloric effect near room temperature in an off-stoichiometric Mn-Co-Ge alloy, across the magnetostructural transition. The isothermal entropy change accompanying this transition has a peak value of nearly 40 J/kg-K near 297 K ... More
Magnetization and Spin-Diffusion of Liquid 3He in AerogelAug 23 2004We report theoretical calculations of the normal-state spin diffusion coefficient of 3He in aerogel, including both elastic and inelastic scattering of 3He quasiparticles, and compare these results with experimental data for 3He in 98% porous silica aerogel. ... More
Nuclear reaction studies of unstable nuclei using relativistic mean field formalisms in conjunction with Glauber modelMar 22 2007We study nuclear reaction cross-sections for stable and unstable projectiles and targets within Glauber model, using densities obtained from various relativistic mean field formalisms. The calculated cross-sections are compared with the experimental data ... More
Single-cycle attosecond pulses by Thomson backscattering of terahertz pulsesNov 16 2017The generation of single-cycle attosecond pulses based on Thomson scattering of terahertz (THz) pulses is proposed. In the scheme, a high-quality relativistic electron beam produced by a laser-plasma wakefield accelerator (LPWA), is sent through suitable ... More
Distinct photoluminescence in multilayered van der Waals heterostructures of MoS2/WS2/ReS2 and BNOct 11 2017Van der Waals heterostructures of (TMDL=1/BNL=1-4/TMDL=1/BNL=1-4), [TMD = MoS2, WS2, and ReS2] are grown on c-plane sapphire substrate by pulsed laser deposition under slow kinetic condition. The heterostructure systems show strong emission around 2.3 ... More
Topological electronic structure and Weyl semimetal in the TlBiSe$_2$ class of semiconductorsSep 26 2012We present an analysis of bulk and surface electronic structures of thallium based ternary III-V-VI$_2$ series of compounds TlMQ$_2$, where M=Bi or Sb and Q=S, Se or Te, using the ab initio density functional theory framework. Based on parity analysis ... More
Galactic cartography with SkyMapper: I. Population sub-structure and the stellar number density of the inner haloJul 10 2018The stars within our Galactic halo presents a snapshot of its ongoing growth and evolution, probing galaxy formation directly. Here, we present our first analysis of the stellar halo from detailed maps of Blue Horizontal Branch (BHB) stars drawn from ... More
Architecture of the Andromeda: a quantitative analysis of clustering in the inner stellar haloOct 19 2016We present a quantitative measurement of the amount of clustering present in the inner $\sim30$ kpc of the stellar halo of the Andromeda galaxy (M31). For this we analyse the angular positions and radial velocities of the carefully selected Planetary ... More
Model-based scaling of the streamwise energy density in high-Reynolds number turbulent channelsFeb 06 2013Oct 03 2013We study the Reynolds number scaling and the geometric self-similarity of a gain-based, low-rank approximation to turbulent channel flows, determined by the resolvent formulation of McKeon & Sharma (2010), in order to obtain a description of the streamwise ... More
Multiscale behavior and fractional kinetics from the data of solar wind - magnetosphere couplingNov 11 2005Multiscale phenomena are ubiquitous in nature as well in laboratories. A broad range of interacting space and time scales determines the dynamics of many systems which are inherently multiscale. In most research disciplines multiscale phenomena are not ... More
A foundation for analytical developments in the logarithmic region of turbulent channelsSep 21 2014An analytical framework for studying the logarithmic region of turbulent channels is formulated. We build on recent findings (Moarref et al., J. Fluid Mech., 734, 2013) that the velocity fluctuations in the logarithmic region can be decomposed into a ... More