Results for "Soumen Mandal"

total 1067took 0.12s
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
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
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
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
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
$\TT^2$-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
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
Optimal two-level choice designs for the main effects and specified interaction effects modelOct 28 2015Choice designs for the main effects model, broader main effects model and main effects plus specified interaction effects model are discussed in this paper. Universally optimal choice designs are obtained for all of these models using Hadamard matrix ... 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 $1 + \frac{(n ... More
Parametric Estimation of HandoffJan 22 2013The efficiency of wireless technology depends upon the seamless connectivity to the user at anywhere any time.Heterogeneous wireless networks are an integration of different networks with diversified technologies. The most essential requirement for Seamless ... More
Analysis and implementation of the Large Scale Video-on-Demand SystemFeb 23 2012Next Generation Network (NGN) provides multimedia services over broadband based networks, which supports high definition TV (HDTV), and DVD quality video-on-demand content. The video services are thus seen as merging mainly three areas such as computing, ... More
Performance Improvement of VOD System by Policy Based Traffic HandleJun 15 2012The distributed system use to enhance the performance of all types of multimedia service in the next generation network. The packet loss occurs in the video on demand system due to delay and huge traffic load from the both sides of client request and ... More
Some small orbifolds over polytopesDec 04 2009Nov 21 2010We introduce some compact orbifolds on which there is a certain finite group action having a simple convex polytope as the orbit space. We compute the orbifold fundamental group and homology groups of these orbifolds. We calculate the cohomology rings ... More
Correlation between incoherent phase fluctuations and disorder in Y$_{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$0.4) are reported over a broad range of temperature and magnetic field. While the Hall and resistivity data ... More
Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting SpacerJun 24 2008The relevance of pair-breaking by exchange and dipolar fields, and by injected spins in a low carrier density cuprate Y$_{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
Synthesis of DNA Templated Tri-functional Electrically Conducting, Optical and Magnetic nanochain of Nicore-Aushell for Bio-deviceDec 31 2008Synthesis of tri functional electrically conducting, optical and magnetic nano-chain of Nicore-Aushell has been discussed here. Our Investigation indicates that such material attached with biomolecule DNA in chain form will have great potentiality in ... 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
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
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
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
4-Velocity distribution function using Maxwell-Boltzmann's original approach and a new form of the relativistic equation of stateMar 17 2011Following the original approach of Maxwell-Boltzmann(MB), we derive a 4-velocity distribution function for the relativistic ideal gas. This distribution function perfectly reduces to original MB distribution in the non-relativistic limit. We express the ... More
Generalized Equivariant Cohomologies of Singular Toric VarietiesOct 29 2018A complex $n$-dimensional toric variety is equipped with a natural action of compact torus $T^n$. In this paper, we introduce the notion of an \emph{almost simple polytope} and compute the $T^n$-equivariant K-theory, cobordism theory and cohomology theory ... 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
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
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
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
A needlet ILC analysis of WMAP 7-year data: estimation of CMB temperature map and power spectrumJun 27 2011The WMAP 7-year temperature maps have been re-analized to extract a CMB map and CMB power spectrum with reduced contamination by astrophysical foregrounds and noise. The method used is based on linear combinations of WMAP data and foreground templates, ... 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
Motion of a random walker in a quenched power law correlated velocity fieldNov 01 2005Jan 12 2006We study the motion of a random walker in one longitudinal and d transverse dimensions with a quenched power law correlated velocity field in the longitudinal x-direction. The model is a modification of the Matheron-de Marsily (MdM) model, with long-range ... More
Electric Field Response In Breathing PyrochloresApr 15 2019We study the effects of a uniform electric field on the the ground state and excitations of the three-dimensional U(1) spin liquid phase of a breathing pyrochlore lattice, arising due to the coupling between the conventional (Maxwell) electric field and ... 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
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
Derived Witt-Dévissage FormalismFeb 14 2014In this article we establish some formalism of Derived Witt-D\'evissage theory for resolving subcategories of abelian categories. Results directly apply to noetherian schemes.
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
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
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
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.
Superconducting instability in non-Fermi liquidsAug 03 2016Sep 16 2016We use renormalization group (RG) analysis and dimensional regularization techniques to study potential superconductivity-inducing four-fermion interactions in systems with critical Fermi surfaces of general dimensions ($m$) and co-dimensions ($d-m$), ... More
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
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
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
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
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
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
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 $[e_3,e_3]=e_1$.
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
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.
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
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
Finite size scaling and first order phase transition in a modified XY-modelJul 24 2009Jan 30 2010Monte Carlo simulation has been performed in a two-dimensional modified XY-model first proposed by Domany et. al [E. Domany, M. Schick and R. H. Swendsen, Phys. Rev. Lett. 52, 1535 (1984)]. The cluster algorithm of Wolff has been used and multiple histogram ... More
Computer simulation of two continuous spin models using Wang-Landau-Transition-Matrix Monte Carlo AlgorithmSep 22 2008Monte Carlo simulation using a combination of Wang Landau (WL) and Transition Matrix (TM) Monte Carlo algorithms to simulate two lattice spin models with continuous energy is described. One of the models, the one dimensional Lebwohl-Lasher model has an ... 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
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
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
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
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
Erratum for "On oriented cliques with respect to push operation"Oct 12 2018An error is spotted in the statement of Theorem~1.3 of our published article titled "On oriented cliques with respect to push operation" (Discrete Applied Mathematics 2017). The theorem provided an exhaustive list of 16 minimal (up to spanning subgraph ... 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
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
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
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
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
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
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
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
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
Genetic Algorithm Based Optimization of Clustering in Ad Hoc NetworksFeb 10 2010In this paper, we have to concentrate on implementation of Weighted Clustering Algorithm with the help of Genetic Algorithm (GA).Here we have developed new algorithm for the implementation of GA-based approach with the help of Weighted Clustering Algorithm ... 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
Effectual gravitational-wave template banks for coalescing compact binaries using a hybrid placement algorithmNov 23 2017Dec 18 2018Recent discoveries of gravitational wave (GW) signals from astrophysical compact binary systems of neutron stars and black holes have firmly established them as prime sources for advanced GW detectors. Theoretical templates of expected signals from such ... More
Effect of a rigid nonpolar solute on the splay, bend elastic constants and on rotational viscosity coefficient of 4-4^\prime -n-octyl-cyanobiphenylNov 27 2000Jan 22 2001The effect of a rigid nonpolar non-mesogenic solute, ``biphenyl'' which is (C_{6}H_{5}-C_{6}H_{5}), on the splay and bend elastic constants and on the rotational viscosity coefficient of (4,4^{\prime})-n-octyl-cyano biphenyl (8CB) is reported. The experiments ... More
Effect of an external magnetic field on the nematic-isotropic phase transition in mesogenic systems of uniaxial and biaxial moleculesDec 17 2012Influence of an external magnetic field on the nematic-isotropic ($N-I$) phase transition in a dispersion model of nematic liquid crystals, where the molecules are either perfectly uniaxial or biaxial (board-like), has been studied by Monte Carlo simulation. ... More
Network Growth with FeedbackMay 27 2008Jan 07 2009Existing models of network growth typically have one or two parameters or strategies which are fixed for all times. We introduce a general framework where feedback on the current state of a network is used to dynamically alter the values of such parameters. ... More
Thermodynamic Products for Einstein-Gauss-Bonnet Black Hole with α-Corrected Entropy TermDec 23 2015In the present work, we consider a charged black hole in five dimensional Einstein-Gauss-Bonnet gravity where the {\alpha} corrected entropy term is considered. We examine the horizon radii product, entropy product, Hawking temperature product and free ... More
Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI classFeb 10 2015Jan 25 2016We show that certain singularities of the Hamiltonian in the complex wave vector space can be used to identify topological quantum phase transitions for $1D$ chiral topological superconductors/superfluids in the BDI class. These singularities fall into ... More
Vacuum stability in an extended standard model with a leptoquarkSep 12 2016Feb 09 2017We investigate the standard model (SM) with the 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 ... More
Leibniz algebra deformations of a Lie algebraFeb 09 2008In this note we compute Leibniz algebra deformations of the 3-dimensional nilpotent Lie algebra $\mathfrak{n}_3$ and compare it with its Lie deformations. It turns out that there are 3 extra Leibniz deformations. We also describe the versal Leibniz deformation ... More
The Homotopy Program in Complete IntersectionsOct 24 2016Let $A$ be a regular ring over an infinite field $k$, with $1/2\in k$ and dimension $d$. Assume $A$ is essentially smooth over $k$ or $k$ is perfect. We discuss the Homotopy Conjecture of Madhav V. Nori, in the complete intersection case (meaning when ... More
Spontaneous vs. Posed smiles - can we tell the difference?May 23 2016Smile is an irrefutable expression that shows the physical state of the mind in both true and deceptive ways. Generally, it shows happy state of the mind, however, `smiles' can be deceptive, for example people can give a smile when they feel happy and ... More
Hybrid models of molecular machines and the no-pumping theoremDec 19 2012Synthetic nanoscale complexes capable of mechanical movement are often studied theoretically using discrete-state models that involve instantaneous transitions between metastable states. A number of general results have been derived within this framework, ... More
Analysis of slow transitions between nonequilibrium steady statesJul 22 2015Transitions between nonequilibrium steady states obey a generalized Clausius inequality, which becomes an equality in the quasistatic limit. For slow but finite transitions, we show that the behavior of the system is described by a response matrix whose ... More
Bosonization of non-relativistic fermions on a circle: Tomonaga's problem revisitedMar 20 2006We use the recently developed tools for an exact bosonization of a finite number $N$ of non-relativistic fermions to discuss the classic Tomonaga problem. In the case of noninteracting fermions, the bosonized hamiltonian naturally splits into an O$(N)$ ... More
Probing 4-Dimensional Nonsupersymmetric Black Holes Carrying D0- and D6-brane chargesMar 01 1998Mar 16 1998We discuss a 4-dimensional nonsupersymmetric black hole solution to low energy type IIA string theory which carries D0- and D6-brane charges. For equal charges this solution reduces to the one discussed recently by Sheinblatt. We present a new parametrization ... More
Quantum Corrected Schwarzschild Black Hole: Inner Horizon Thermodynamic BehaviorsNov 13 2015The thermodynamic properties of Cauchy horizon is a matter of interest. Event horizon and Cauchy horizon together can enlighten us about the micro-states of a black hole. In addition, if we consider a black hole metric modified with quantum terms, which ... More
Quantum Isometry group of dual of finitely generated discrete groups and quantum groupsAug 25 2014Apr 07 2016We study quantum isometry groups, denoted by $\mathbb{Q}(\Gamma, S)$, of spectral triples on $C^*_r(\Gamma)$ for a finitely generated discrete group coming from the word-length metric with respect to a symmetric generating set $S$. We first prove a few ... More
Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV$_{2}$O$_{6}$Sep 05 2015Jan 13 2016We have investigated the magnetic and magnetocaloric properties of antiferromagnetic Ising spin chain CoV$_{2}$O$_{6}$ by magnetization and heat capacity measurements. Both monoclinic $\alpha$-CoV$_{2}$O$_{6}$ and triclinic $\gamma$-CoV$_{2}$O$_{6}$ exhibit ... More
Revisiting AdS/CFT at a finite radial cut-offAug 01 2016Dec 13 2016We revisit AdS/CFT at finite radial cut-off, specifically in the context of double trace perturbations, $\mathbb{O}_n$= $\mathbb{O}(x) (\partial^2)^{n} {\mathcal O}(x)$, with arbitrary $n$. As well-known, the standard GKPW prescription, applied to a finite ... More
What is the gravity dual of the confinement/deconfinement transition in holographic QCD?Nov 22 2011Mar 27 2012We study the gravity dual of four dimensional pure Yang-Mills theory through D4 branes, as proposed by Witten (holographic QCD). In this holographic QCD, it has been widely believed that the confinement phase in the pure Yang-Mills theory corresponds ... More
On Dévissage for Witt groupsJun 15 2013Feb 06 2014In this paper we extend and apply the work of Paul Balmer and others on derived and triangular Witt Groups. We obtain a generalized form of d\'{e}vissage for derived Witt Groups over Cohen-Macaulay rings.
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