Results for "M. Rostami"

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Conjugation of Transitive Permutation Pairs and Dessins d'EnfantsJan 31 2017Apr 06 2017Let E be a finite set. Given permutations x and y of E that together generate a transitive subgroup, for which s is it true that x and the conjugate of y by s also generate a transitive subgroup? Such transitive permutation pairs encode dessins d'enfants, ... More
Kottwitz's nearby cycles conjecture for a class of unitary Shimura varietiesDec 01 2011Oct 22 2016This paper proves that the nearby cycles complexes on a certain family of PEL local models are central with respect to the convolution product of sheaves on the corresponding affine flag varieties. As a corollary, the semisimple trace functions defined ... More
FWM in One-dimensional Nonlinear Photonic Crystal and Theoretical Investigation of Parametric Down Conversion (Steady State Analysis)Apr 17 2006Apr 27 2006The light propagation through one-dimensional photonic crystal using Four-wave mixing (FWM) nonlinear process is modeled. The linear and nonlinear indexes of refraction are approximated with the first Fourier harmonic term. Based on this approximation, ... More
Coherent and Squeezed States in Shape Invariant Potentials Obtained from the Master FunctionMar 13 2000A general algorithm has been given for the generation of Coherent and Squeezed states, in one-dimensional hamiltonians with shape invariant potential, obtained from the master function. The minimum uncertainty states of these potentials are expressed ... More
Bogomolov multiplier and the Lazard correspondenceApr 09 2019In this paper we extend the notion of CP covers for groups to the field of Lie algebras, and show that despite the case of groups, all CP covers of a Lie algebra are isomorphic. Finally we show that CP covers of groups and Lie rings which are in Lazard ... More
P - V Criticality of Logarithmic Corrected Dyonic Charged AdS Black HoleMay 11 2016Aug 01 2016In this paper, we consider dyonic charged AdS black hole which is holographic dual of a van der Waals fluid. We use logarithmic corrected entropy and study thermodynamics of the black hole and show that holographic picture is still valid. Critical behaviors ... More
Kiselev/ CFT correspondence and thermodynamic black holeDec 12 2018Feb 28 2019In this paper, we consider Kiselev black hole solution as dust and radiation. We obtain the inner and outer horizons and investigate the thermal properties of corresponding black hole. We find the area and entropy products and show that they are independent ... More
A note on left $φ$-biflat Banach algebrasMay 14 2019In this paper, we study the notion of $\phi$-biflatness for some Banach algebras, where $\phi$ is a non-zero multiplicative linear functional. We show that the Segal algebra $S(G)$ is left $\phi$-biflat if and only if $G$ is amenable. Also, we characterize ... More
The impact of the intrinsic charm quark content of the proton on differential $γ+c$ cross sectionOct 28 2015Sep 26 2016We present a comparative analysis of the impact of the non-perturbative intrinsic charm quark content of the proton on differential cross section of $\gamma +c $-jet in $ pp $ and $ p\bar{p} $ collisions, for the kinematic regions that are sensitive to ... More
The temperature and entropy corrections on the charged hairy black holesMar 04 2019May 15 2019In this paper, we consider the first order correction of the entropy and temperature in a charged black hole with a scalar field. Here, we apply such correction for the different cases of black holes. These corrections are due to the thermal fluctuations ... More
The temperature and entropy corrections on the charged hairy black holesMar 04 2019In this paper, we investigate the first order correction entropy and temperature in a charged black hole with a scalar field. Here, we apply such correction for the different the case of a black hole. Also, we take advantage of such corrections and study ... More
Logarithmic corrected Polynomial $f(R)$ inflation mimicking a cosmological constantOct 07 2015Feb 03 2016In this paper, we consider an inflationary model of $f(R)$ gravity with polynomial form plus logarithmic term. We calculate some cosmological parameters and compare our results with the Plank 2015 data. We find that presence of both logarithmic and polynomial ... More
The Dimensions of the Symmetry Types of Polyhedra with Reflection GroupsAug 31 2015Let P and Q be convex polyhedra in E3 with face lattices F(P) and F(Q) and symmetry groups G(P) and G(Q), respectively. Then, P and Q are called face equivalent if there is a lattice isomorphism between F(P) and F(Q); P and Q are called symmetry equivalent ... More
On the Canonical Representatives of a Finite Weyl GroupMay 27 2015Apr 18 2016Let K be a field and G a split connected reductive affine algebraic K-group. Let T be a split maximal torus of G, W its finite Weyl group, and R its root system. After fixing a realization of R in G and choosing a simple system for R, one gets a system ... More
On the Complementary Equienergetic GraphsJul 30 2019The energy of a simple graph $G$, denoted by $\mathcal{E}(G)$, is the sum of the absolute values of the eigenvalues of $G$. Two $n$-vertex graphs with the same energies are called equienergetic graphs. A graph $G$ with the property $G\cong \overline{G}$ ... More
Conjugacy classes of non-translations in affine Weyl groups and applications to Hecke algebrasJun 21 2013Nov 11 2014Let W be an Iwahori-Weyl group of a connected reductive group G over a non-archimedean local field. I prove that if w is an element of W that does not act on the corresponding apartment of G by a translation then one can apply to w a sequence of conjugations ... More
Piezoelectricity and valley Chern number in inhomogeneous hexagonal 2D crystalsJul 12 2017Jul 10 2018Conversion of mechanical forces to electric signal is possible in non-centrosymmetric materials due to linear piezoelectricity. The extraordinary mechanical properties of two-dimensional materials and their high crystallinity make them exceptional platforms ... More
The Bernstein presentation for general connected reductive groupsDec 28 2013Nov 10 2014Let F be a non-Archimedean local field and let G be a connected reductive affine algebraic F-group. Let I be an Iwahori subgroup of G(F) and denote by H(G; I) the Iwahori-Hecke algebra, i.e. the convolution algebra of complex-valued functions on G(F) ... More
An Application of Manifold Learning in Global Shape DescriptorsJan 08 2019With the rapid expansion of applied 3D computational vision, shape descriptors have become increasingly important for a wide variety of applications and objects from molecules to planets. Appropriate shape descriptors are critical for accurate (and efficient) ... More
Free-Space Nonlinear Beam Combining Towards FilamentationSep 02 2016Multi-filamentation opens new degrees of freedom for manipulating electromagnetic waves in air. However, without control, multiple filament interactions, including attraction, repulsion or fusion often result in formation of complex disordered filament ... More
Covariant extrinsic gravity and the geometric origin of dark energyJul 07 2013Feb 25 2015We construct the covariant or model independent induced Einstein-Yang-Mills field equations on a 4-dimensional brane embedded isometrically in an D-dimensional bulk space, assuming the matter fields are confined to the brane. Applying this formalism to ... More
Charge compressibility and quantum magnetic phase transition in MoS$_2$Dec 28 2014Jun 02 2015We investigate the ground-state properties of monolayer MoS$_2$ incorporating the Coulomb interaction together with a short-range intervalley interaction between charged particles between two valleys within the Hartree-Fock approximation. We consider ... More
Investigation of pionic contribution in the lepton and anti-lepton production cross section in p-Cu and p-Pt collisionFeb 01 2016For detailed explanation of the experimental results of lepton production cross section in hadronic collisions such as nucleon-nucleon or nucleon-nuclei, it is of great importance to use quarks and sea quarks distribution function inside free and bound ... More
Valley Zeeman effect and spin-valley polarized conductance in monolayer MoS$_2$ in a perpendicular magnetic fieldDec 03 2014Feb 28 2015We study the effect of a perpendicular magnetic field on the electronic structure and charge transport of a monolayer MoS$_2$ nanoribbon at zero temperature. We particularly explore the induced valley Zeeman effect through the coupling between the magnetic ... More
Image Super-Resolution Based on Sparsity Prior via Smoothed $l_0$ NormMar 22 2016In this paper we aim to tackle the problem of reconstructing a high-resolution image from a single low-resolution input image, known as single image super-resolution. In the literature, sparse representation has been used to address this problem, where ... More
FWM in One-dimensional Nonlinear Photonic Crystal and Theoretical Investigation of Parametric Down Conversion Efficiency (Steady State Analysis)Nov 06 2006We study the light propagation in one-dimensional photonic crystal via nonlinear Four Wave Mixing (FWM) process. The linear and nonlinear refractive indexes are approximated with the first Fourier harmonic term. A system of the nonlinear coupled mode ... More
The Satake isomorphism for special maximal parahoric Hecke algebrasJul 26 2009Oct 17 2009Let G denote a connected reductive group over a nonarchimedean local field F. Let K denote a special maximal parahoric subgroup of G(F). We establish a Satake isomorphism for the Hecke algebra H of K-bi-invariant compactly supported functions on G(F). ... More
Exact Solution of Abel Differential Equation with Arbitrary Nonlinear CoefficientsMar 18 2015This paper is dedicated to present an exact solution for a nonlinear differential equation so-called Abel equation. This equation was known as one of the group of unsolvable differential equations. The present method is applicable for any arbitrary form ... More
Electronic structure and layer-resolved transmission of bilayer graphene nanoribbon in the presence of vertical fieldsJun 20 2013Jul 04 2013Electronic properties of bilayer graphene are distinct from both the conventional two dimensional electron gas and monolayer graphene due to its particular chiral properties and excitation charge carrier dispersions. We study the effect of strain on the ... More
Electronic ground state properties of strained grapheneOct 16 2012We consider the effect of the Coulomb interaction in strained graphene using tight-binding approximation together with the Hartree-Fock interactions. The many-body energy dispersion relation, anisotropic Fermi velocity renormalization and charge compressibility ... More
Theory of third harmonic generation in graphene: a diagrammatic approachJan 29 2016We present a finite-temperature diagrammatic perturbation theory of third harmonic generation (THG) in doped graphene. We carry out calculations of the third-order conductivity in the scalar potential gauge, highlighting a subtle cancellation between ... More
Why the measured cosmological constant is smallOct 07 2015In a quest to explain the small value of the today's cosmological constant, following the approach introduced in [1], we show that the theoretical value of cosmological constant is consistent with its observational value. In more detail, we study the ... More
Reading Stockholm Riots 2013 in social media by text-miningOct 04 2013The riots in Stockholm in May 2013 were an event that reverberated in the world media for its dimension of violence that had spread through the Swedish capital. In this study we have investigated the role of social media in creating media phenomena via ... More
Convolutions on the Haagerup tensor products of Fourier algebrasJun 19 2014We study the ranges of the maps of convolution $u\otimes v\mapsto u\ast v$ and a `twisted' convolution $u\otimes v\mapsto u\ast \check{v}$ ($\check{u}(s)=u(s^{-1})$) and on the Haagerup tensor product of a Fourier algebra of a compact group $A(G)$ with ... More
Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at the LHCAug 16 2018Feb 13 2019An accurate knowledge of nuclear parton distribution functions (nPDFs) is an essential ingredient of high energy physics calculations when the processes are involving nuclei in the initial state. It is well known now that the prompt photon production ... More
Excitation of surface plexciton wave at interface of a metal and a columnar thin film infiltrated with J-aggregate dyesSep 24 2018In this paper, we report theoretical investigation on excitation of surface plexciton wave at interface of a metal and a columnar thin film infiltrated with J-aggregate dyes using transfer matrix method in Kretschmann configuration. The results reveal ... More
Intrinsic optical conductivity of modified-Dirac fermion systemsMar 01 2014We analytically calculate the intrinsic longitudinal and transverse optical conductivities of electronic systems which govern by a modified-Dirac fermion model Hamiltonian for materials beyond graphene such as monolayer MoS$_2$ and ultrathin film of the ... More
Charged Vector InflationDec 18 2018We present a model of inflation in which the inflaton field is charged under a triplet of $U(1)$ gauge fields. The model enjoys an internal $O(3)$ symmetry supporting the isotropic FRW solution. With an appropriate coupling between the gauge fields and ... More
Rejecting inadmissible rules in reduced normal forms in S4Jan 18 2017Several methods for checking admissibility of rules in the modal logic $S4$ are presented in [1], [15]. These methods determine admissibility of rules in $S4$, but they don't determine or give substitutions rejecting inadmissible rules. In this paper, ... More
Schrödinger field theory in curved spacetime: In-In formalism and three-point function for inflationary backgroundOct 17 2016We review the Schr\"odinger picture of field theory in curved spacetime and using this formalism, the power spectrum of massive non-interacting, minimally coupled scalars in a fixed de Sitter background is obtained. To calculate the N-point function in ... More
Hot electrons modulation of third harmonic generation in grapheneMar 03 2019Hot electrons dominate the ultrafast ($\sim$fs-ps) optical and electronic properties of metals and semiconductors and they are exploited in a variety of applications including photovoltaics and photodetection. We perform power-dependent third harmonic ... More
Pumping $ac$ Josephson current in the Single Molecular Magnets by spin nutationNov 29 2012We demonstrate that an {\it ac} Josephson current is pumped through the Single Molecular Magnets (SMM) by the spin nutation. The spin nutation is generated by applying a time dependent magnetic field to the SMM. We obtain the flowing charge current through ... More
The impact of intrinsic charm on the parton distribution functionsNov 03 2016In this work, we present a new investigation about the impact of intrinsic charm (IC) on the physical observables, in particular, on the heavy structure function $F_2^c$. Since IC distribution is dominant at large Bjorken variable $x$, normally, it is ... More
Beautiful mathematics for beauty-full and other multi-heavy hadronic systemsJan 21 2018Jul 12 2018In most non-perturbative methods in hadron physics the calculations are started with a correlation function in terms of some interpolating and transition currents in $ x $-space. For simplicity, the calculations are then transformed to the momentum space ... More
A more robust multiparameter conformal mapping method for geometry generation of any arbitrary ship sectionMar 18 2015The central problem of strip theory is the calculation of potential flowaround 2D sections. One particular method of solutions to this problem is conformal mapping of the body section to the unit circle over which a solution of potential flow is available. ... More
On the relation between boundary proposals and hidden symmetries of the extended pre-big bang quantum cosmologyDec 19 2014A framework associating quantum cosmological boundary conditions to minisuperspace hidden symmetries has been introduced in \cite{7}. The scope of the application was, notwithstanding the novelty, restrictive because it lacked a discussion involving realistic ... More
Five dimensional cosmological traversable wormholeDec 31 2014In this paper, a traversable wormhole in the Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) model with one extra spacelike compact dimension is studied. We have chosen dynamical compactification as the evolution of the fifth dimension. In this respect, ... More
Exciton routing in the heterostructure of TMD and quantum paraelectricsFeb 20 2019We propose a scheme for the spatial exciton binding energy control and exciton routing in transition metal dichalcogenide (TMD) monolayer which lies on a quantum paraelectric substrate. It relies on the ultrasensitive response of the substrate dielectric ... More
The impact of the intrinsic charm quark content of the proton on differential $γ+c$ cross sectionOct 28 2015Sep 24 2018We present a comparative analysis of the impact of the non-perturbative intrinsic charm quark content of the proton on differential cross section of $\gamma +c $-jet in $ pp $ and $ p\bar{p} $ collisions, for the kinematic regions that are sensitive to ... More
Complementary Learning for Overcoming Catastrophic Forgetting Using Experience ReplayMar 11 2019May 31 2019Despite huge success, deep networks are unable to learn effectively in sequential multitask learning settings as they forget the past learned tasks after learning new tasks. Inspired from complementary learning systems theory, we address this challenge ... More
Valley polarized transport in strained graphene based Corbino discSep 02 2013Nov 25 2013We study analytically and numerically the magnetotransport of strained graphene in a Corbino geometry gating in the presence of an external perpendicular magnetic field. The conductance of the Corbino disc of deformed graphene with a uniaxial and an inhomogeneous ... More
Edge modes in zigzag and armchair ribbons of monolayer MoS$_2$Nov 22 2015Oct 29 2016We explore the electronic structure, orbital character and topological aspect of a monolayer MoS$_2$ nanoribbon using tight-binding (TB) and low-energy (${\bm k}\cdot{\bm p} $) models. We obtain a mid-gap edge mode in the zigzag ribbon of monolayer MoS$_2$, ... More
Spin relaxation and the Kondo effect in transition metal dichalcogenide monolayersAug 01 2016We investigate the spin relaxation and Kondo resistivity caused by magnetic impurities in doped transition metal dichalcogenides monolayers. We show that momentum and spin relaxation times due to the exchange interaction by magnetic impurities, are much ... More
An Optimized Semantic Web Service Composition Method Based on Clustering and Ant Colony AlgorithmFeb 10 2014In today's Web, Web Services are created and updated on the fly. For answering complex needs of users, the construction of new web services based on existing ones is required. It has received a great attention from different communities. This problem ... More
Spin nutation effects in molecular nanomagnet$-$superconductor tunnel junctionsSep 29 2013We study the spin nutation effects of the molecular nanomagnet on the Josephson current through a superconductor$|$molecular nanomagnet$|$superconductor tunnel junction. We explicitly demonstrate that due to the spin nutation of the molecular nanomagnet ... More
Analysis of Quantum Light Memory in Atomic Systems (Final)Feb 09 2004Oct 14 2005We extend the theory of quantum light memory in atomic ensemble of Lambda type atoms with considering lower levels coherence decay rate and one and two-photon detunings from resonances in low intensity and adiabatic passage limit. We obtain that with ... More
Andreev reflection in monolayer MoS2Oct 28 2013Jan 04 2014Andreev reflection in a monolayer molybdenum disulfide superconducting-normal (S/N) hybrid junction is investigated. We find, by using a modified-Dirac Hamiltonian and the scattering formalism, that the perfect Andreev reflection happens at normal incidence ... More
The uncertainty of parton distribution functions due to physical observables in a global analysisOct 03 2016The recent measurement of the differential $ \gamma+c $-jet cross section, performed at the Tevatron collider in Run II by the D0 collaboration, is studied in a next-to-leading order (NLO) global QCD analysis to assess its impact on the proton parton ... More
Ramsey Interferometers as a test for the correction to quantum mechanicsAug 30 2018By applying the basic concept of the density matrix in an open quantum system and modification of quantum mechanics, we derive Kossakowski-Lindblad equation and different properties of this equation are reviewed. Next, a pedagogical approach is used to ... More
Primordial inhomogeneities from massive defects during inflationMay 26 2016We consider the imprints of local massive defects, such as a black hole or a massive monopole, during inflation. The massive defect breaks the background homogeneity. We consider the limit that the physical Schwarzschild radius of the defect is much smaller ... More
Image Deblurring Using Derivative Compressed Sensing for Optical Imaging ApplicationJul 28 2011Reconstruction of multidimensional signals from the samples of their partial derivatives is known to be a standard problem in inverse theory. Such and similar problems routinely arise in numerous areas of applied sciences, including optical imaging, laser ... More
The Bogomolov multiplier of Lie algebrasMay 15 2018In this paper, we extend the notion of the Bogomolov multipliers and the CP-extensions to Lie algebras. Then we compute the Bogomolov multipliers for Abelian, Heisenberg and nilpotent Lie algebras of class at most 6. Finally we compute the Bogomolov multipliers ... More
Indirect exchange interaction between magnetic adatoms in a monolayer MoS2Dec 06 2012Feb 24 2013We study the Ruderman-Kittle-Kasuya-Yosida (RKKY) interaction in a monolayer MoS$_2$. We show that the rotation of the itinerant electron spin due to the spin-orbit coupling causes a twisted interaction between two magnetic adatoms which consists of different ... More
Effective field theory of statistical anisotropies for primordial bispectrum and gravitational wavesFeb 13 2017We present the effective field theory studies of primordial statistical anisotropies in models of anisotropic inflation. The general action in unitary gauge is presented to calculate the leading interactions between the gauge field fluctuations, the curvature ... More
Pairwise maximum-entropy models and their Glauber dynamics: bimodality, bistability, non-ergodicity problems, and their elimination via inhibitionMay 16 2016Pairwise maximum-entropy models have been used in recent neuroscientific literature to predict the activity of neuronal populations, given only the time-averaged correlations of the neuron activities. This paper provides evidence that the pairwise model, ... More
Quantum cosmological intertwining: Factor ordering and boundary conditions from hidden symmetriesJul 15 2015We explore the implications of hidden symmetries present in a particular quantum cosmological setting, extending the results reported in \cite{10,11}. In more detail, our case study is constituted by a spatially closed Friedmann-Lema\^{\i}tre-Robertson-Walker ... More
Analysis of Quantum Light Memory in Atomic SystemsMar 14 2004We extend the theory to describe the quantum light memory in type atoms with considering (lower levels coherency decay rate) and detuning for the probe and the control fields. We obtain that with considering these parameters, group velocity of the probe ... More
Beautiful mathematics for beauty-full and other multi-heavy hadronic systemsJan 21 2018In most non-perturbative methods in hadron physics the calculations are started with a correlation function in terms of some interpolating and transition currents in $ x $-space. For simplicity, the calculations are then transformed to the momentum space ... More
Theory of plasmonic effects in nonlinear optics: the case of grapheneOct 16 2016We develop a microscopic large-$N$ theory of electron-electron interaction corrections to multi-legged Feynman diagrams describing second- and third-order nonlinear response functions. Our theory, which reduces to the well-known random phase approximation ... More
Complementary Learning for Overcoming Catastrophic Forgetting Using Experience ReplayMar 11 2019Despite huge success, deep networks are unable to learn effectively in sequential multitask learning settings as they forget the past learned tasks after learning new tasks. Inspired from complementary learning systems theory, we address this challenge ... More
Effective lattice Hamiltonian for monolayer MoS2 : Tailoring electronic structure with perpendicular electric and magnetic fieldsFeb 24 2013Aug 27 2013We propose an effective lattice Hamiltonian for monolayer MoS$_2$ in order to describe the low-energy band structure and investigate the effect of perpendicular electric and magnetic fields on its electronic structure. We derive a tight-binding model ... More
Using Task Descriptions in Lifelong Machine Learning for Improved Performance and Zero-Shot TransferOct 10 2017Knowledge transfer between tasks can improve the performance of learned models, but requires an accurate estimate of the inter-task relationships to identify the relevant knowledge to transfer. These inter-task relationships are typically estimated based ... More
The impact of intrinsic charm on the parton distribution functionsNov 03 2016Jan 24 2017In this work, we present a new investigation about the impact of intrinsic charm (IC) on the physical observables, in particular, on the heavy structure function $F_2^c$. Since IC distribution is dominant at large Bjorken variable $x$, normally, it is ... More
The uncertainty of parton distribution functions due to physical observables in a global analysisOct 03 2016Jan 24 2017The recent measurement of the differential $ \gamma+c $-jet cross section, performed at the Tevatron collider in Run II by the D0 collaboration, is studied in a next-to-leading order (NLO) global QCD analysis to assess its impact on the proton parton ... More
A new integer-valued AR(1) process based on power series thinning operatorFeb 03 2018Oct 05 2018In this paper, we introduce the first-order integer-valued autoregressive (INAR(1)) model, with Poisson-Lindley innovations based on power series thinning operator. Some mathematical features of this process are given and estimating the parameters is ... More
Ultra-strong nonlinear optical processes and trigonal warping in MoS$_2$ layersAug 14 2016We report ultra-strong high-order nonlinear multiphoton processes in monolayer MoS$_2$ (1L-MoS$_2$): the third harmonic is thirty times stronger than the second harmonic, and the fourth harmonic is comparable to the second harmonic. We find that second ... More
EEG Representation Using Multi-instance Framework on The Manifold of Symmetric Positive Definite Matrices for EEG-based Computer Aided DiagnosisFeb 08 2017The generalization and robustness of an electroencephalogram (EEG)-based computer aided diagnostic system are crucial requirements in actual clinical practice. To reach these goals, we propose a new EEG representation that provides a more realistic view ... More
Theory of strain in single-layer transition metal dichalcogenidesAug 12 2015Nov 22 2015Strain engineering has emerged as a powerful tool to modify the optical and electronic properties of two-dimensional crystals. Here we perform a systematic study of strained semiconducting transition metal dichalcogenides. The effect of strain is considered ... More
Evaluation of Huffman and Arithmetic Algorithms for Multimedia Compression StandardsAug 31 2011Compression is a technique to reduce the quantity of data without excessively reducing the quality of the multimedia data. The transition and storing of compressed multimedia data is much faster and more efficient than original uncompressed multimedia ... More
Joint Dictionaries for Zero-Shot LearningSep 12 2017A classic approach toward zero-shot learning (ZSL) is to map the input domain to a set of semantically meaningful attributes that could be used later on to classify unseen classes of data (e.g. visual data). In this paper, we propose to learn a visual ... More
Generative Continual Concept LearningJun 10 2019After learning a concept, humans are also able to continually generalize their learned concepts to new domains by observing only a few labeled instances without any interference with the past learned knowledge. In contrast, learning concepts efficiently ... More
Convective dissolution of carbon dioxide in deep saline aquifers: Insights from engineering a high-pressure porous Hele-Shaw cellDec 20 2018We present the first experiments of dissolution-driven convection of carbon dioxide (CO$_2$) in a confined brine-saturated porous medium at high pressures. We designed a novel Hele-Shaw cell that allows for both visual and quantitative analyses, and address ... More
Bubble nucleation and inflationary perturbationsJul 21 2017In this work we study the imprints of bubble nucleation on primordial inflationary perturbations. We assume that the bubble is formed via the tunneling of a spectator field from the false vacuum of its potential to its true vacuum. We consider the configuration ... More
Multi-Agent Distributed Lifelong Learning for Collective Knowledge AcquisitionSep 15 2017Feb 20 2018Lifelong machine learning methods acquire knowledge over a series of consecutive tasks, continually building upon their experience. Current lifelong learning algorithms rely upon a single learning agent that has centralized access to all data. In this ... More
Pseudo-Euler equations from nonlinear optics: plasmon-assisted photodetection beyond hydrodynamicsNov 12 2018Jan 15 2019A great deal of theoretical and experimental efforts have been devoted in the last decades to the study of long-wavelength photodetection mechanisms in field-effect transistors hosting two-dimensional (2D) electron systems. A particularly interesting ... More
Maximum-entropy and representative samples of neuronal activity: a dilemmaMay 23 2018The present work shows that the maximum-entropy method can be applied to a sample of neuronal recordings along two different routes: (1) apply to the sample; or (2) apply to a larger, unsampled neuronal population from which the sample is drawn, and then ... More
MRF-based multispectral image fusion using an adaptive approach based on edge-guided interpolationDec 28 2015In interpretation of remote sensing images, it is possible that the images which are supplied by different sensors wouldn't be understandable or we could not get vital information from them. For better visual perception of images, it is essential to operate ... More
Observation of Optical Refrigeration in a Holmium-doped CrystalNov 14 2018We report the first demonstration of solid-state optical refrigeration of a Ho-doped material. A 1 mol% Ho-doped Yttrium Lithium Fluoride (YLF) crystal is cooled by mid-IR laser radiation, and its external quantum efficiency and parasitic background absorption ... More
Highly accurate and efficient algorithm for electrostatic interaction of charged particles confined by metallic parallel platesDec 23 2015We present an accurate and efficient algorithm to calculate the electrostatic interaction of charged point particles with partially periodic boundary conditions that are confined along the nonperiodic direction by two metallic parallel plates. The method ... More
Learning a Domain-Invariant Embedding for Unsupervised Domain Adaptation Using Class-Conditioned Distribution AlignmentJul 04 2019We address the problem of unsupervised domain adaptation (UDA) by learning a cross-domain agnostic embedding space, where the distance between the probability distributions of the two source and target visual domains is minimized. We use the output space ... More
Testing fine-grained parallelism for the ADMM on a factor-graphMar 08 2016There is an ongoing effort to develop tools that apply distributed computational resources to tackle large problems or reduce the time to solve them. In this context, the Alternating Direction Method of Multipliers (ADMM) arises as a method that can exploit ... More
Increasing the Network life Time by Simulated Annealing Algorithm in WSN with Point CoverageMay 13 2013Since we are not able to replace the battery in a wireless sensor networks (WSNs), the issues of energy and lifetime are the most important parameters. In asymmetrical networks, different sensors with various abilities are used. Super nodes, with higher ... More
First Results from the La Silla-QUEST Supernova Survey and the Carnegie Supernova ProjectMar 24 2016The LaSilla/QUEST Variability Survey (LSQ) and the Carnegie Supernova Project (CSP II) are collaborating to discover and obtain photometric light curves for a large sample of low redshift (z < 0.1) Type Ia supernovae. The supernovae are discovered in ... More
Broadband, electrically tuneable, third harmonic generation in grapheneOct 06 2017Optical harmonic generation occurs when high intensity light ($>10^{10}$W/m$^{2}$) interacts with a nonlinear material. Electrical control of the nonlinear optical response enables applications such as gate-tunable switches and frequency converters. Graphene ... More
LSQ14efd: observations of the cooling of a shock break-out event in a type Ic SupernovaJul 14 2017We present the photometric and spectroscopic evolution of the type Ic supernova LSQ14efd, discovered by the La Silla QUEST survey and followed by PESSTO. LSQ14efd was discovered few days after explosion and the observations cover up to ~100 days. The ... More
LSQ14bdq: A Type Ic super-luminous supernova with a double-peaked light curveMay 05 2015Jun 09 2015We present data for LSQ14bdq, a hydrogen-poor super-luminous supernova (SLSN) discovered by the La Silla QUEST survey and classified by the Public ESO Spectroscopic Survey of Transient Objects. The spectrum and light curve are very similar to slow-declining ... More
The evolution of superluminous supernova LSQ14mo and its interacting host galaxy systemNov 29 2016We present and analyse an extensive dataset of the superluminous supernova LSQ14mo (z = 0.256), consisting of a multi-colour lightcurve from -30 d to +70 d in the rest-frame and a series of 6 spectra from PESSTO covering -7 d to +50 d. This is among the ... More
The evolution of superluminous supernova LSQ14mo and its interacting host galaxy systemNov 29 2016Feb 24 2017We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting of a multi-colour lightcurve from -30 d to +70 d in the rest-frame and a series of 6 spectra from PESSTO covering -7 d to +50 d. This is ... More
Tm-doped Crystals for mid-IR Optical Cryocoolers and Radiation Balanced LasersJan 23 2019Feb 01 2019We report the complete characterization of various cooling grade Tm-doped crystals including the first demonstration of optical refrigeration in Tm:YLF crystals. Room temperature laser cooling efficiencies of 1% and 2% (mol) Tm:YLF, and 1% Tm:BYF crystals ... More
MRF-Based Multispectral Image Fusion Using an Adaptive Approach Based on Edge-Guided InterpolationDec 28 2015Mar 25 2019In interpretation of remote sensing images, it is possible that some images which are supplied by different sensors become understandable. For better visual perception of these images, it is essential to operate series of pre-processing and elementary ... More