Results for "Soumen Mandal"

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Magnetic interactions and electron transport in hole-doped manganite-superconducting cuprate heterostructuresApr 02 2009This thesis presents a systematic study of magnetotransport and magnetic ordering in manganite-high T$_c$ cuprate spin valve structures. YBa$_{2}$Cu$_{3}$O$_{7}$ - La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ heterostructures of (110) orientation are grown to allow ... More
A comparative study of angle dependent magnetoresistance in [001] and [110] $La_{2/3}Sr_{1/3}MnO_3$Apr 26 2010The angle dependent magnetoresistance study on [001] and [110] La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ thin films show that the anisotropy energy of [110] films is higher when compared with a [001] oriented La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ film of similar ... More
Magnetoresistance studies of $La_{2/3} Sr_{1/3} MnO_3$ - $YBa_2 Cu_3 O_7$ - $La_{2/3} Sr_{1/3} Mn O_3$ trilayers with ferromagnetic coupling along the nodal direction of $YBa_2 Cu_3 O_7$Mar 06 2010I have successfully prepared (110) trilayers of \LSMO-\YBCO-\LSMO. Magnetization measurements on these samples reveal a stronger coupling between the ferromagnetic layers. The coupling is an order of magnitude higher than that seen in the case of (001) ... More
Polishing of {100} and {111} single crystal diamond through the use of Chemical Mechanical PolishingFeb 14 2014Diamond is one of the hardest and most difficult to polish materials. In this paper, the polishing of {111} and {100} single crystal diamond surfaces by standard Chemical Mechanical Polishing, as used in the silicon industry, is demonstrated. A Logitech ... More
A simple, space constrained NIRIM type reactor for chemical vapour deposition of diamondMar 26 2018In this paper the design of a simple, space constrained chemical vapour deposition reactor for diamond growth is detailed. Based on the design by NIRIM, the reactor is composed of a quartz discharge tube placed within a 2.45 GHz waveguide to create the ... More
Strongly inhomogeneous distribution of spectral properties of silicon-vacancy color centers in nanodiamondsJul 10 2018The silicon-vacancy (SiV) color center in diamond is a solid-state single photon emitter and spin quantum bit suited as a component in quantum devices. Here, we show that the SiV center in nanodiamond exhibits a strongly inhomogeneous distribution with ... More
Production of Metal-free Diamond NanoparticlesAug 20 2018In this paper, the controlled production of high quality metal-free diamond nanoparticles is demonstrated. Milling with tempered steel is shown to leave behind iron oxide contamination which is difficult to remove. Milling with SiN alleviates this issue ... More
Quantitative analysis of the interaction between a dc SQUID and an integrated micromechanical doubly clamped cantileverFeb 08 2019Based on the superconducting quantum interference device (SQUID) equations described by the resistively- and capacitively-shunted junction model coupled to the equation of motion of a damped harmonic oscillator, we provide simulations to quantitatively ... More
Magnetization depinning transition, anisotropic magnetoresistance and inplane anisotropy in two polytypes of La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ epitaxial filmsFeb 27 2008Jul 30 2008The isothermal magnetoresistance [R($\theta$)] of [001] and [110] epitaxial films of La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ measured as a function of the angle $\theta$ between current ($\vec{I}$) and magnetic field ($\vec{H}$), both in the plane of the film, ... More
Redox agent enhanced chemical mechanical polishing of thin film diamondJan 02 2018The chemical nature of the chemical mechanical polishing of diamond has been examined by adding various redox agents to the alkaline SF1 polishing slurry. Three oxidizing agents namely, hydrogen peroxide, potassium permanganate and ferric nitrate, and ... More
Orientability and equivariant oriented cobordism of 2-torus manifoldsJul 29 2010Apr 26 2016We give a necessary and sufficient condition for the orientability of a locally standard 2-torus manifold with a fixed point which generalizes previous results of Nakayama-Nishimura in 2005 and Soprunova-Sottile in 2013. We construct manifolds with boundary ... More
Parametric Estimation of HandoffJan 22 2013The efficiency of wireless technology depends upon the seamless connectivity to the user at anywhere any time.Heterogeneous wireless networks are an integration of different networks with diversified technologies. The most essential requirement for Seamless ... More
Analysis and implementation of the Large Scale Video-on-Demand SystemFeb 23 2012Next Generation Network (NGN) provides multimedia services over broadband based networks, which supports high definition TV (HDTV), and DVD quality video-on-demand content. The video services are thus seen as merging mainly three areas such as computing, ... More
Performance Improvement of VOD System by Policy Based Traffic HandleJun 15 2012The distributed system use to enhance the performance of all types of multimedia service in the next generation network. The packet loss occurs in the video on demand system due to delay and huge traffic load from the both sides of client request and ... More
Some $\ZZ_3^n$-equivariant triangulations of $\CP^n$May 11 2014In 1983, Banchoff and Kuhnel constructed a minimal triangulation of $\CP^2$ with 9 vertices. $\CP^3$ was first triangulated by Bagchi and Datta in 2012 with 18 vertices. Known lower bound on number of vertices of a triangulation of $\CP^n$ is $1 + \frac{(n ... More
$\TT^2$-cobordism of Quasitoric 4-ManifoldsSep 02 2010Nov 06 2012We show the $\TT^2$-cobordism group of the category of 4-dimensional quasitoric manifolds is generated by the $\TT^2$-cobordism classes of $\CP^2$. We construct nice oriented $\TT^2$ manifolds with boundary where the boundary is the Hirzebruch surfaces. ... More
APS Implementation Over Vehicular Ad Hoc NetworksSep 24 2012The real world scenario has changed from the wired connection to wireless connection.Over the years software, development has responded to the increasing growth of wireless connectivity in developing network enabled software.The problem arises in the ... More
Efficient Traffic Control of VoD SystemOct 15 2011It has been a challenging issue to provide digital quality multimedia data stream to the remote user through the distributed system. The main aspects to design the real distributed system, which reduce the cost of the network by means of reduce packet ... More
Triangulations of $\mathbb{RP}^n$ with few verticesMar 02 2014Apr 14 2015P. Arnoux and A. Marin showed that any triangulation of $\mathbb{RP}^n$ contains more than $\frac{(n+1)(n+2)}{2}$ vertices if $n \geq 3$. We construct some natural triangulation of $\mathbb{RP}^n$ with $\frac{n(n+5)}{2}-1$ vertices for all $n \geq 3$. ... More
On $\ZZ_2^n$-equivariant triangulation of $\RR P^n$Jun 12 2013Mar 24 2016We study several properties of $\ZZ_2^n$-equivariant triangulations of $\RR P^n$. We show that a $\ZZ_2^n$-equivariant triangulation of $\RR P^n$ induces a triangulated subdivision of the orbit space $\bigtriangleup^n$. We show that any vertex minimum ... More
Analog of Superradiance effect in BECJan 30 2005We investigate the scattering of phase oscillation of Bose-Einstein Condensate by a 'draining of bathtub' type fluid motion. We derive a relation between the reflection and transmission coefficients which exhibits existence of analog of 'Superradiance ... More
Complex Cobordism of quasitoric orbifoldsJun 07 2014Jan 29 2016We construct orbifolds with quasitoric boundary and show that they have stable almost complex structure. We show that a quasitoric orbifold is complex cobordant to finite disjoint copies of complex orbifold projective spaces. Finally some computations ... More
Efficient Packet Forwarding in Mesh NetworkMay 12 2012Wireless Mesh Network (WMN) is a multi hop low cost, with easy maintenance robust network providing reliable service coverage. WMNs consist of mesh routers and mesh clients. In this architecture, while static mesh routers form the wireless backbone, mesh ... More
Sound Wave in Vortex with SinkOct 22 2003Nov 17 2003Using Komar's definition, we give expressions for the mass and angular momentum of a rotating acoustic black hole. We show that the mass and angular momentum so defined, obey the equilibrium version of the first law of Black Hole thermodynamics. We also ... More
Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting SpacerJun 24 2008The relevance of pair-breaking by exchange and dipolar fields, and by injected spins in a low carrier density cuprate Y$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_7$ sandwiched between two ferromagnetic La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ layers is examined. At low external ... More
Correlation between incoherent phase fluctuations and disorder in Y$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_{7-δ}$ epitaxial films from Nernst effect measurementsMar 28 2007Jul 03 2007Measurements of Nernst effect, resistivity and Hall angle on epitaxial films of Y$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_{7-\delta}$(Pr-YBCO, 0$\leq x\leq$0.4) are reported over a broad range of temperature and magnetic field. While the Hall and resistivity data ... More
Surface zeta potential and diamond seeding on gallium nitride filmsJul 17 2017Oct 09 2017Measurement of zeta potential of Ga and N-face gallium nitride has been carried out as function of pH. Both the faces show negative zeta potential in the pH range 5.5-9. The Ga face has an isoelectric point at pH 5.5. The N-face shows higher negative ... More
Image Enhancement with Statistical EstimationMay 07 2012Contrast enhancement is an important area of research for the image analysis. Over the decade, the researcher worked on this domain to develop an efficient and adequate algorithm. The proposed method will enhance the contrast of image using Binarization ... More
Features and Aggregators for Web-scale Entity SearchMar 13 2013We focus on two research issues in entity search: scoring a document or snippet that potentially supports a candidate entity, and aggregating scores from different snippets into an entity score. Proximity scoring has been studied in IR outside the scope ... More
Learning Joint Query Interpretation and Response RankingDec 26 2012Thanks to information extraction and semantic Web efforts, search on unstructured text is increasingly refined using semantic annotations and structured knowledge bases. However, most users cannot become familiar with the schema of knowledge bases and ... More
Performance of Modeling wireless networks in realistic environmentJan 04 2012A wireless network is realized by mobile devices which communicate over radio channels. Since, experiments of real life problem with real devices are very difficult, simulation is used very often. Among many other important properties that have to be ... More
Class Based Admission Control by Complete Partitioning -Video on Demand ServerMay 11 2010In the next generation network (NGN) environment specific consideration is on bandwidth minimization, because this reduces the cost of network. In response to the growing market demand for multimedia traffic transmission, NGN concept has been produced. ... More
Enhancement of Image Resolution by BinarizationNov 21 2011Image segmentation is one of the principal approaches of image processing. The choice of the most appropriate Binarization algorithm for each case proved to be a very interesting procedure itself. In this paper, we have done the comparison study between ... More
Performance Measurement of the Heterogeneous NetworkOct 17 2011Till today we dreamt of imperceptible delay in a network. The computer science research grows today faster than ever offering more and more services (computational representational, graphical, intelligent implication etc) to its user. But the problem ... More
Covering Arrays on Product GraphsDec 22 2015Two vectors $x,y$ in $\mathbb{Z}_g^n$ are $ qualitatively$ $ independent$ if for all pairs $(a,b)\in \mathbb{Z}_g\times \mathbb{Z}_g$, there exists $i\in \{1,2,\ldots,n\}$ such that $(x_i,y_i)=(a,b)$. A covering array on a graph $G$, denoted by $CA(n,G,g)$, ... More
Some Aspects of Equivariant LS-categoryFeb 09 2015Sep 23 2016We study the lower bounds and upper bounds for LS-category and equivariant LS-category. In particular we compute both invariants for torus manifolds. There are some examples to show the sharpness of conditions in the theorems. Moreover the equivariant ... More
A Medial Axis Based Thinning Strategy for Character ImagesMar 03 2011Thinning of character images is a big challenge. Removal of strokes or deformities in thinning is a difficult problem. In this paper, we have proposed a medial axis based thinning strategy used for performing skeletonization of printed and handwritten ... More
A class of torus manifolds with nonconvex orbit spaceSep 05 2011May 11 2014We study a class of smooth torus manifolds whose orbit space has the combinatorial structure of a simple polytope with holes. We construct moment angle manifolds for such polytopes with holes and use them to prove that the associated torus manifolds admit ... More
Optimal two-level designs for partial profile choice experimentsOct 27 2015We improve the existing results of optimal partial profile paired choice designs and provide new designs for situations where the choice set sizes are greater than two. The optimal designs are obtained under the main effects models and the broader main ... More
Equilibrium triangulations of some quasitoric 4-manifoldsJul 25 2015Quasitoric manifolds, introduced by M. Davis and T. Januskiewicz in 1991, are topological generalizations of smooth complex projective spaces. In 1992, Banchoff and K\"uhnel constructed a 10-vertex equilibrium triangulations of $\CP^2$. We generalize ... More
Enhanced Antenna Position Implementation Over Vehicular Ad Hoc Network (VNET) In 3D SpaceNov 21 2011The technology related to networking moves wired connection to wireless connection.The basic problem concern in the wireless domain, random packet loss for the end to end connection. In this paper we show the performance and the impact of the packet loss ... More
Mixed Covering Arrays on 3-Uniform HypergraphsAug 29 2015Covering arrays are combinatorial objects that have been successfully applied in the design of test suites for testing systems such as software, circuits and networks, where failures can be caused by the interaction between their parameters. In this paper, ... More
A needlet ILC analysis of WMAP 9-year polarisation data: CMB polarisation power spectraApr 02 2012Jul 17 2013We estimate Cosmic Microwave Background (CMB) polarisation power spectra, and temperature-polarisation cross-spectra, from the 9-year data of the Wilkinson Microwave Anisotropy Probe (WMAP). Foreground cleaning is implemented using minimum variance linear ... More
On Quasitoric OrbifoldsSep 18 2008Feb 10 2009Quasitoric spaces were introduced by Davis and Januskiewicz in their 1991 Duke paper. There they extensively studied topological invariants of quasitoric manifolds. These manifolds are generalizations or topological counterparts of nonsingular projective ... More
Equilibrium and equivariant triangulations of some small covers with minimum number of verticesJun 06 2013Aug 04 2014Small covers were introduced by Davis and Januszkiewicz in 1991. We introduce the notion of equilibrium triangulations for small covers. We study equilibrium and vertex minimal $\mathbb{Z}_2^2$-equivariant triangulations of $2$-dimensional small covers. ... More
Nonequilibrium heat capacityNov 27 2013Development of steady state thermodynamics and statistical mechanics depends crucially on our ability to develop notions of equilibrium thermodynamics for nonequilibrium steady states (NESS). The present paper considers the development of heat capacity. ... More
Appearance Based Robot and Human Activity Recognition SystemFeb 04 2016Feb 10 2016In this work, we present an appearance based human activity recognition system. It uses background modeling to segment the foreground object and extracts useful discriminative features for representing activities performed by humans and robots. Subspace ... More
BRIDGE: A Model for Modern Software Development Process to Cater the Present Software CrisisSep 08 2011As hardware components are becoming cheaper and powerful day by day, the expected services from modern software are increasing like any thing. Developing such software has become extremely challenging. Not only the complexity, but also the developing ... More
UV/IR Mixing In Non-Fermi Liquids: Higher-Loop Corrections In Different Energy RangesAug 23 2016We revisit the Ising-nematic quantum critical point with an $m$-dimensional Fermi surface by applying a dimensional regularization scheme. We compute the contribution from two-loop and three-loop diagrams in the intermediate energy range controlled by ... More
An Example of Constructing Versal Deformation for Leibniz AlgebrasDec 13 2007In this work we compute a versal deformation of the three dimensional nilpotent Leibniz algebra over $\mathbb{C}$, defined by the nontrivial brackets $[e_1,e_3]=e_2$ and $[e_3,e_3]=e_1$.
Unification and new extensions of the no-pumping theorems of stochastic pumpsNov 12 2014From molecular machines to quantum dots, a wide range of mesoscopic systems can be modeled by periodically driven Markov processes, or stochastic pumps. Currents in the stochastic pumps are delimited by an exact no-go condition called the no-pumping theorem ... More
High temperature expansion, Virial coefficients and Exclusion statisticsAug 20 2009Aug 26 2009We follow the generalisation of exclusion statistics to infinite dimensional Hilbert space as envisaged in Phys. Rev. Lett. {\bf{72}}, 3629, 1994. We reproduce the third virial coefficients at leading order for single species of anionic gas and 2nd mixed ... More
Exclusion limits on a scalar decaying to photons and distinguishing its production mechanismsDec 04 2016LHC run-II has a great potential to search for new resonances in the diphoton channel. Latest 13 TeV data already put stringent limits on the cross sections in the diphoton channel assuming the resonance is produced through the gluon-gluon fusion. Many ... More
A Statistical Nonparametric Approach of Face Recognition: Combination of Eigenface & Modified k-Means ClusteringApr 07 2011Facial expressions convey non-verbal cues, which play an important role in interpersonal relations. Automatic recognition of human face based on facial expression can be an important component of natural human-machine interface. It may also be used in ... More
Key to Network ControllabilitySep 17 2012Liu et al recently proposed a minimum number of driver nodes needed to obtain full structural controllability over a directed network. Driver nodes are unmatched nodes, from which there are directed paths to all matched nodes. Their most important assertion ... More
Persistence Exponents and Scaling In Two Dimensional XY model and A Nematic ModelMar 23 2005Apr 07 2005The persistence exponents associated with the T=0 quenching dynamics of the two dimensional XY model and a two dimensional uniaxial spin nematic model have been evaluated using a numerical simulation. The site persistence or the probability that the sign ... More
Scaling behaviour and superconducting instability in anisotropic non-Fermi liquidsAug 31 2016We study the scaling behaviour of the optical conductivity $(\sigma)$, free energy density $(F)$ and shear viscosity of the quantum critical point associated with spin density wave phase transition for a two-dimensional metallic system with $C_2$ symmetry. ... More
Addendum to "Super-GCA from $\mathcal{N}=(2,2)$ super-Virasoro": Super-GCA connection with tensionless stringsJul 07 2016In this addendum, we consider the connection between certain $2d$ super-GCA, obtained from the parametric contractions of $2d$ SCFTs, which can describe the constraint algebra of null spinning strings.
Quantum isometry group of dual of finitely generated discrete groups- $\textrm{II}$Apr 09 2015Feb 18 2016As a contribution of the programme of Goswami and Mandal (2014), we carry out explicit computations of $\mathbb{Q}(\Gamma,S)$, the quantum isometry group of the canonical spectral triple on $C_{r}^{*}(\Gamma)$ coming from the word length function corresponding ... More
On exact Courant algebrasJul 18 2014In this note we will show that exact Courant algebras over a Lie algebra $\mathfrak{g}$ can be characterised via Leibniz $2$- cocycles, and the automorphism group of a given exact Courant algebra is in a one-to-one correspondence with first Leibniz cohomology ... More
SRS BUILDER 1.0: An Upper Type CASE Tool For Requirement SpecificationSep 08 2011Software (SW) development is a labor intensive activity. Modern software projects generally have to deal with producing and managing large and complex software products. Developing such software has become an extremely challenging job not only because ... More
A new construction of lens spacesApr 17 2013Jan 29 2016Let $T^n$ be the real $n$-torus group. We give a new definition of lens spaces and study the diffeomorphic classification of lens spaces. We show that any $3$-dimensional lens space $L(p; q)$ is $T^2$-equivariantly cobordant to zero. We also give some ... More
Role of topological defects in the phase transition of modified XY model : A Monte Carlo studyNov 05 2009Mar 26 2010Monte Carlo simulation has been performed on a classical two dimensional XY- model with a modified form of interaction potential to investigate the role of topological defects on the phase transition exhibited by the model. In simulations in a restricted ... More
Is small-world network disordered?Sep 01 2004Nov 10 2005Recent renormalization group results predict non self averaging behaviour at criticality for relevant disorder. However, we find strong self averaging(SA) behaviour in the critical region of a quenched Ising model on an ensemble of small-world networks, ... More
Dynamical Scaling In Two Dimensional Quenched Uniaxial Nematic Liquid CrystalsMar 05 2005The phase ordering kinetics of the two-dimensional uniaxial nematic has been studied using a Cell Dynamic Scheme. The system after quench from T=infinity was found to scale dynamically with an asymptotic growth law similar to that of two-dimensional O(2) ... More
Phase Transitions In Two Planar Lattice Models And Topological Defects: A Monte Carlo StudyMar 05 2005Monte Carlo simulation has been performed in the planar P(_{2}) and P(_{4}) models to investigate the effects of the suppression of topological defects on the phase transition exhibited by these models. Suppression of the 1/2-defects on the square plaquettes ... More
Chemical mechanical polishing of thin film diamondAug 06 2013The demonstration that Nanocrystalline Diamond (NCD) can retain the superior Young's modulus (1,100 GPa) of single crystal diamond twinned with its ability to be grown at low temperatures (<450 {\deg}C) has driven a revival into the growth and applications ... More
Superconducting nano-mechanical diamond resonatorsJan 28 2014In this work we present the fabrication and characterization of superconducting nano-mechanical resonators made from nanocrystalline boron doped diamond (BDD). The oscillators can be driven and read out in their superconducting state and show quality ... More
Photometric Evidence of Bullets in SS433 JetJan 14 2005We report the photometric evidence of bullet like features in SS433 in X-rays, Infra-red and Radio bands through a multi-wavelength campaign.
Growth of [110] La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ - YBa$_{2}$Cu$_{3}$O$_{7}$ heterostructuresJan 25 2012YBa$_{2}$Cu$_{3}$O$_{7}$ - La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ heterostructures of [110] orientation are grown to allow direct injection of spin polarized holes from the La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ into the CuO$_2$ superconducting planes. The magnetic ... More
A detailed analysis of the Raman spectra in superconducting boron doped nanocrystalline diamondApr 24 2012May 03 2013The light scattering properties of superconducting (Tc=3.8 K) heavily boron doped nanocrystalline diamond has been investigated by Raman spectroscopy using visible excitations. Fano type interference of the zone-center phonon line and the electronic continuum ... More
Efficient Radio Frequency filters for space constrained cryogenic set-upsDec 23 2010Feb 25 2011Noise filtering is an essential part for measurement of quantum phenomena at extremely low temperatures. Here, we present the design of a filter which can be installed in space constrained cryogenic environment containing a large number of signal carrying ... More
On chromatic number of colored mixed graphsAug 28 2015An $(m,n)$-colored mixed graph $G$ is a graph with its arcs having one of the $m$ different colors and edges having one of the $n$ different colors. A homomorphism $f$ of an $(m,n)$-colored mixed graph $G$ to an $(m,n)$-colored mixed graph $H$ is a vertex ... More
Integral cohomology ring of toric orbifoldsSep 10 2015Jan 11 2016We study the integral cohomology rings of certain families of $2n$-dimensional orbifolds $X$ that are equipped with a well-behaved action of the $n$-dimensional torus. The orbifolds arise from two distinct but closely related combinatorial sources: from ... More
Phase Diagram of the Half-Filled Ionic Hubbard ModelMar 30 2015May 18 2015We study the phase diagram of the ionic Hubbard model (IHM) at half-filling using dynamical mean field theory (DMFT), with two impurity solvers, namely, iterated perturbation theory (IPT) and continuous time quantum Monte Carlo (CTQMC). The physics of ... More
Discriminative Link Prediction using Local Links, Node Features and Community StructureOct 17 2013A link prediction (LP) algorithm is given a graph, and has to rank, for each node, other nodes that are candidates for new linkage. LP is strongly motivated by social search and recommendation applications. LP techniques often focus on global properties ... More
Local and global persistence exponents of two quenched continuous lattice spin modelsMay 12 2010Local and global persistence exponents associated with zero temperature quenched dynamics of two dimensional XY model and three dimensional Heisenberg model have been estimated using numerical simulations. We have used the method of block persistence ... More
Discreteness of Space from GUP in a Weak Gravitational FieldJan 28 2016Feb 03 2016Quantum gravity effects modify the Heisenberg's uncertainty principle to a generalized uncertainty principle (GUP). Earlier work showed that the GUP-induced corrections to the Schr\"odinger equation, when applied to a non-relativistic particle in a one-dimensional ... More
Superconducting Diamond on Silicon Nitride for Device ApplicationsOct 24 2018Chemical vapour deposition (CVD) grown nanocrystalline diamond is an attractive material for the fabrication of devices. For some device architectures, optimisation of its growth on silicon nitride is essential. Here, the effects of three pre-growth surface ... More
Preliminary Design of ARIES-Devasthal Faint Object Spectrograph and CameraMay 04 2009We present here the preliminary design of ARIES-Devasthal Faint Object Spectrograph and Camera (ADFOSC), which is a multi-mode instrument for both imaging and spectroscopy. ADFOSC is the first-generation instrument to be mounted at the axial port of the ... More
Study Of A Planar Lattice Model With $P_4$ InteractionAug 18 1997A planar square lattice model with 3-d spins interacting with nearest neighbours through a potential -$\epsilon P_4 (cos \theta_{ij})$ is studied by Monte Carlo technique. Lattice sizes from 10$\times$10 to 30$\times$30 are considered for calculating ... More
On the Integral Cohomology Ring of Toric Orbifolds and Singular Toric VarietiesSep 10 2015Dec 20 2016We examine the integral cohomology rings of certain families of $2n$-dimensional orbifolds $X$ that are equipped with a well-behaved action of the $n$-dimensional real torus. These orbifolds arise from two distinct but closely related combinatorial sources, ... More
GIRNet: Interleaved Multi-Task Recurrent State Sequence ModelsNov 28 2018Dec 25 2018In several natural language tasks, labeled sequences are available in separate domains (say, languages), but the goal is to label sequences with mixed domain (such as code-switched text). Or, we may have available models for labeling whole passages (say, ... More
Nanostructures made from superconducting boron doped diamondMar 05 2010Mar 30 2010We report on the transport properties of nanostructures made from boron-doped superconducting diamond. Starting from nanocrystalline superconducting boron-doped diamond thin films, grown by Chemical Vapor Deposition, we pattern by electron-beam lithography ... More
Statistical Isotropy of CMB Polarization MapsMar 16 2006Jun 25 2006We formulate statistical isotropy of CMB anisotropy maps in its most general form. We also present a fast and orientation independent statistical method to determine deviations from statistical isotropy in CMB polarization maps. Importance of having statistical ... More
Infinite Families of Equivariantly Formal Toric OrbifoldsJan 12 2018Jan 22 2018The simplicial wedge construction on simplicial complexes and simple polytopes has been used by a variety of authors to study toric and related spaces, including non-singular toric varieties, toric manifolds, intersections of quadrics and more generally, ... More
Battery-like Supercapacitors from Vertically Aligned Carbon Nanofibers Coated Diamond: Design and DemonstratorJan 26 2018Battery-like supercapacitors feature high power and energy densities as well as long-term capacitance retention. The utilized capacitor electrodes are thus better to have large surface areas, high conductivity, high stability, and importantly be of binder ... More
Measuring Statistical Isotropy of CMB AnisotropyJul 25 2006The statistical expectation values of the temperature fluctuations and polarization of cosmic microwave background (CMB) are assumed to be preserved under rotations of the sky. We investigate the statistical isotropy (SI) of the CMB maps recently measured ... More
Enhanced thermodynamic efficiency in time asymmetric ratchetsDec 12 2004Feb 09 2005The energetic efficiency of an overdamped Brownian particle in a saw tooth potential in the presence of time asymmetric forcing is studied in the adiabatic limit. An error made in the earlier work on the same problem in literature is corrected. We find ... More
Effect of temperature and magnetic field on two-flavor superconducting quark matterAug 02 2016Oct 11 2016We investigate the effect of turning on temperature for the charge neutral phase of two-flavor color superconducting (2SC) dense quark matter in presence of constant external magnetic field. Within the Nambu-Jona-Lasinio model, by tuning the diquark coupling ... More
Super-GCA from $\mathcal{N} = (2,2)$ Super-VirasoroJan 18 2016Jan 25 2016We derive the extended Supersymmetric Galilean Conformal Algebra (SGCA) in two spacetime dimensions by the method of group contraction on $2d$ $\mathcal{N}=(2,2)$ superconformal algebra. Both the parent and daughter algebras are infinite-dimensional. ... More
A proof by graphical construction of the no-pumping theorem of stochastic pumpsSep 13 2011A stochastic pump is a Markov model of a mesoscopic system evolving under the control of externally varied parameters. In the model, the system makes random transitions among a network of states. For such models, a "no-pumping theorem" has been obtained, ... More
Work and information processing in a solvable model of Maxwell's demonJun 25 2012We describe a minimal model of an autonomous Maxwell demon, a device that delivers work by rectifying thermal fluctuations while simultaneously writing information to a memory register. We solve exactly for the steady-state behavior of our model, and ... More
Dual giant gravitons in AdS$_m$ $\times$ Y$^n$ (Sasaki-Einstein)Aug 14 2006Feb 28 2007We consider BPS motion of dual giant gravitons on Ad$S_5\times Y^5$ where $Y^5$ represents a five-dimensional Sasaki-Einstein manifold. We find that the phase space for the BPS dual giant gravitons is symplectically isomorphic to the Calabi-Yau cone over ... More
Vacuum stability in extended standard model with leptoquarkSep 12 2016We investigate the standard model (SM) with extension of a charged scalar having fractional electromagnetic charge of $-1/3$ unit and with lepton and baryon number violating couplings at tree level. Without directly taking part in the electro-weak (EW) ... More
Novel aspects of higher dimensional structural description of trigonal, pentagonal and their related phasesOct 13 2010A four dimensional description for the trigonal phase is presented. It has been demonstrated that it is possible to model one dimensional quasiperiodic structure with trigonal symmetry apart from recovering the Miller-Bravais scheme for the description ... More
Graviton Signals in Central Production at the LHCMay 16 2013In this paper, we study central production, in the inclusive case, to look for graviton signals in large extra dimensional model using dilepton and diphoton channels. We carefully analyze signal and possible Standard Model background processes and study ... More
Black Hole Thermodynamic Products in Einstein Gauss Bonnet GravityOct 28 2015We study the thermodynamic properties of black hole horizons in Einstein Gauss Bonnet gravity. We derive the thermodynamic products of characteristic parameters to mark which are global. We further interpret the stability of the black holes by computing ... More
Study of unconventional superfluid phases and the phase dynamics in spin-orbit coupled bose systemApr 08 2013We study the phase distribution and its dynamics in spin-orbit coupled two component ultracold Bosons for finite size system. Using an inhomogeneous meanfield analysis we demonstrate how phase distribution evolves as we tune the spin-orbit coupling $\gamma$ ... More
Collective modes of an anisotropic quark-gluon plasma induced by relativistic jetsApr 13 2012We discuss the characteristics of collective modes induced by relativistic jets in an anisotropic quark-gluon plasma(AQGP). Assuming a tsunami-like initial jet distribution, it is found that the dispersion relations for both the stable and unstable modes ... More