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Results for "Rana X Adhikari"

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Astrophysical science metrics for next-generation gravitational-wave detectorsMay 07 2019May 20 2019The second generation of gravitational-wave detectors are being built and tuned all over the world. The detection of signals from binary black holes is beginning to fulfill the promise of gravitational-wave astronomy. In this work, we examine several ... More
Apparatus to Measure Optical Scatter of Coatings Versus Annealing TemperatureJan 29 2019Light scattered by amorphous thin-film optical coatings limits the sensitivity of interferometric gravitational-wave detectors. We describe an imaging scatterometer to assess the role that crystal growth during annealing plays in this scatter.
A Technique for In-situ Measurement of Free Spectral Range and Transverse Mode Spacing of Optical CavitiesJun 22 2012Jul 03 2012Length and g-factor are fundamental parameters that characterize optical cavities. We developed a technique to measure these parameters in-situ by determining the frequency spacing between the resonances of fundamental and spatial modes of an optical ... More
Cosmic Explorer: The U.S. Contribution to Gravitational-Wave Astronomy beyond LIGOJul 10 2019This white paper describes the research and development needed over the next decade to realize "Cosmic Explorer," the U.S. node of a future third-generation detector network that will be capable of observing and characterizing compact gravitational-wave ... More
Large-angle scattered light measurements for quantum-noise filter cavity design studiesApr 11 2012Optical loss from scattered light could limit the performance of quantum-noise filter cavities being considered for an upgrade to the Advanced LIGO gravitational-wave detectors. This paper describes imaging scatterometer measurements of the large-angle ... More
Subtraction of Newtonian Noise Using Optimized Sensor ArraysJul 02 2012Jan 05 2013Fluctuations in the local Newtonian gravitational field present a limit to high precision measurements, including searches for gravitational waves using laser interferometers. In this work, we present a model of this perturbing gravitational field and ... More
Quantum Limits of Interferometer Topologies for Gravitational Radiation DetectionMay 17 2013Jun 09 2014In order to expand the astrophysical reach of gravitational wave detectors, several interferometer topologies have been proposed to evade the thermodynamic and quantum mechanical limits in future detectors. In this work, we make a systematic comparison ... More
External quantum efficiency enhancement by photon recycling with backscatter evasionOct 20 2017May 21 2018The nonunity quantum efficiency (QE) in photodiodes (PD) causes deterioration of signal quality in quantum optical experiments due to photocurrent loss as well as the introduction of vacuum fluctuations into the measurement. In this paper, we report that ... More
Probing microplasticity in small scale FCC crystals via Dynamic Mechanical AnalysisDec 28 2016In small-scale metallic systems, collective dislocation activity has been correlated with size effects in strength and with a step-like plastic response under uniaxial compression and tension. Yielding and plastic flow in these samples is often accompanied ... More
Suppression of quantum-radiation-pressure noise in an optical springOct 01 2012Dec 05 2013Recent advances in micro- and nanofabrication techniques have led to corresponding improvement in the performance of optomechanical systems, which provide a promising avenue towards quantum-limited metrology and the study of quantum behavior in macroscopic ... More
Residual Amplitude Modulation in Interferometric Gravitational Wave DetectorsSep 18 2013The effects of residual amplitude modulation (RAM) in laser interferometers using heterodyne sensing can be substantial and difficult to mitigate. In this work, we analyze the effects of RAM on a complex laser interferometer used for gravitational wave ... More
Towards the Fundamental Quantum Limit of Linear Measurements of Classical SignalsAug 02 2016The quantum Cram\'er-Rao bound sets a fundamental limit to how well we can measure classical signals with detectors operating in the quantum regime. Applying linear-response theory and the Heisenberg uncertainty relation, we derive the general condition ... More
Laser Interferometers as Dark Matter DetectorsMay 03 2016While global cosmological and local galactic abundance of dark matter is well established, its identity, physical size and composition remain a mystery. In this paper, we analyze an important question of dark matter detectability through its gravitational ... More
Brownian Thermal Noise in Multilayer Coated MirrorsJul 25 2012We analyze the Brownian thermal noise of a multi-layer dielectric coating, used in high-precision optical measurements including interferometric gravitational-wave detectors. We assume the coating material to be isotropic, and therefore study thermal ... More
Passive, free-space laser gyroscopeAug 27 2015Laser gyroscopes making use of the Sagnac effect have been used as highly accurate rotation sensors for many years. First used in aerospace and defense applications, these devices have more recently been used for precision seismology and in other research ... More
Towards the Fundamental Quantum Limit of Linear Measurements of Classical SignalsAug 02 2016Jun 02 2017The quantum Cram\'er-Rao bound (QCRB) sets a fundamental limit for the measurement of classical signals with detectors operating in the quantum regime. Using linear-response theory and the Heisenberg uncertainty relation, we derive a general condition ... More
Systematic calibration error requirements for gravitational-wave detectors via the Cramér-Rao boundDec 28 2017Gravitational-wave (GW) laser interferometers such as Advanced LIGO transduce spacetime strain into optical power fluctuation. Converting this optical power fluctuations back into an estimated spacetime strain requires a calibration process that accounts ... More
Broadband Measurement of Coating Thermal Noise in Rigid Fabry-Perot CavitiesJun 17 2014We report on the relative length fluctuation of two fixed-spacer Fabry-Perot cavities with mirrors fabricated from silica/tantala dielectric coatings on fused silica substrates. By locking a laser to each cavity and reading out the beat note $\hat{\nu} ... More
Towards the Laboratory Search for Space-Time DissipationApr 10 2015Jun 23 2015It has been speculated that gravity could be an emergent phenomenon, with classical general relativity as an effective, macroscopic theory, valid only for classical systems at large temporal and spatial scales. As in classical continuum dynamics, the ... More
Backward errors and linearizations for palindromic matrix polynomialsDec 22 2008Aug 13 2009We derive computable expressions of structured backward errors of approximate eigenelements of *-palindromic and *-anti-palindromic matrix polynomials. We also characterize minimal structured perturbations such that approximate eigenelements are exact ... More
Ensemble Sensing on Smart Werables for a better Telehealth SystemSep 23 2014Sep 30 2014Telehealth offers interesting avenues for improving healthcare access in vulnerable populations through use of electronic devices in the patient's home that monitor and assess for early complications. However, complication of operation and poor reliability ... More
Low-Frequency Terrestrial Gravitational-Wave DetectorsAug 09 2013Direct detection of gravitational radiation in the audio band is being pursued with a network of kilometer-scale interferometers (LIGO, Virgo, KAGRA). Several space missions (LISA, DECIGO, BBO) have been proposed to search for sub-Hz radiation from massive ... More
Global Feed-Forward Vibration Isolation in a km scale InterferometerApr 24 2012May 24 2012Using a network of seismometers and sets of optimal filters, we implemented a feed-forward control technique to minimize the seismic contribution to multiple interferometric degrees of freedom of the LIGO interferometers. The filters are constructed by ... More
Genetic Algorithm in Audio SteganographyJul 10 2014With the advancement of communication technology,data is exchanged digitally over the network. At the other side the technology is also proven as a tool for unauthorized access to attackers. Thus the security of data to be transmitted digitally should ... More
Fluctuations of eigenvalues of patterned random matricesOct 04 2016Jul 04 2017In this article we study the fluctuation of linear statistics of eigenvalues of circulant, symmetric circulant, reverse circulant and Hankel matrices. We show that the linear spectral statistics of these matrices converges to the Gaussian distribution ... More
Extended Born-Oppenheimer equation for tri-state systemOct 02 2004We present explicit form of non-adiabatic coupling (NAC) elements of nuclear Schroedinger equation (SE) for a coupled tri-state electronic manifold in terms of mixing angles of real electronic basis functions. If the adiabatic-diabatic transformation ... More
Structured inverse least-squares problem for structured matricesJan 10 2015Given a pair of matrices X and B and an appropriate class of structured matrices S, we provide a complete solution of the structured inverse least-squares problem $min_{A\in_S} \|AX-B\|_F$. Indeed, we determine all solutions of the structured inverse ... More
On backward errors of structured polynomial eigenproblems solved by structure preserving linearizationsJul 15 2009First, we derive explicit computable expressions of structured backward errors of approximate eigenelements of structured matrix polynomials including symmetric, skew-symmetric, Hermitian, skew-Hermitian, even and odd polynomials. We also determine minimal ... More
Left Translates of a Square Integrable Function on the Heisenberg groupDec 01 2017The aim of this paper is to study some properties of left translates of a square integrable function on the Heisenberg group. First, a necessary and sufficient condition for the existence of the canonical dual to a function $\varphi\in L^{2}(\mathbb{R}^{2n})$ ... More
Another Sierpinski object in BFTSMay 17 2013We identify a Sierpinski object in the category of fuzzy bitopological spaces, which is different from the two Sierpinski objects in this category, obtained earlier by Khastgir and Srivastava ['On two epireflective subcategories of the category of 2$T_0$-fuzzy ... More
Universality in the fluctuation of eigenvalues of random circulant matricesAug 09 2017Feb 10 2018We show that the linear statistics of eigenvalues of circulant matrix obey the Gaussian central limit theorem for a large class of input sequences.
Memory formation in cyclically deformed amorphous solids and sphere assembliesMay 23 2018We study a model amorphous solid that is subjected to repeated athermal cyclic shear deformation. It has previously been demonstrated that the memory of the amplitudes of shear deformation the system is subjected to (or trained at) is encoded, and can ... More
The Political Economy of FDI flows into Developing Countries: Does the depth of International Trade Agreements Matter?Feb 02 2014There is considerable debate whether the domestic political institutions (specifically, the country s level of democracy) of the host developing country toward foreign investors are effective in establishing the credibility of commitments are still underway, ... More
Astrophysical science metrics for next-generation gravitational-wave detectorsMay 07 2019The second generation of gravitational-wave detectors are being built and tuned all over the world. The detection of signals from binary black holes is beginning to fulfill the promise of gravitational-wave astronomy. In this work, we examine several ... More
Astrophysical science metrics for next-generation gravitational-wave detectorsMay 07 2019May 09 2019The second generation of gravitational-wave detectors are being built and tuned all over the world. The detection of signals from binary black holes is beginning to fulfill the promise of gravitational-wave astronomy. In this work, we examine several ... More
Angular control of optical cavities in a radiation pressure dominated regime: the Enhanced LIGO caseOct 14 2013We describe the angular sensing and control of the 4 km detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO). The culmination of first generation LIGO detectors, Enhanced LIGO operated between 2009 and 2010 with about 40 kW of laser ... More
Coherent Cancellation of Photothermal Noise in GaAs/Al$_{0.92}$Ga$_{0.08}$As Bragg MirrorsJun 23 2015Oct 26 2015Thermal noise is a limiting factor in many high-precision optical experiments. A search is underway for novel optical materials with reduced thermal noise. One such pair of materials, gallium arsenide and aluminum-alloyed gallium arsenide (collectively ... More
Active noise cancellation in a suspended interferometerDec 09 2011We demonstrate feed-forward vibration isolation on a suspended Fabry-Perot interferometer using Wiener filtering and a variant of the common Least Mean Square (LMS) adaptive filter algorithm. We compare the experimental results with theoretical estimates ... More
Feedback based Mobility Control Algorithm for Maximizing Node Coverage by Drone Base StationsNov 23 2018Drone base stations (DBSs) have recently gained wide popularity as a possible solution to provide wireless connectivity in a variety of scenarios, for example, in inaccessible terrains such as connectivity over vast areas of a water body or in rural areas ... More
Dark matter mass from relic abundance, extra $U(1)$ Gauge boson and Active-Sterile Neutrino MixingJun 24 2019In a model with extra $U(1)$ gauge to Standard Model gauge group we have shown the allowed region of masses of extra gauge boson and the dark matter which is the lightest one among other right-handed Majorana fermions present in the model. To obtain this ... More
A Nonlinear Splitting Algorithm for Systems of Partial Differential Equations with self-DiffusionOct 26 2015Systems of reaction-diffusion equations are commonly used in biological models of food chains. The populations and their complicated interactions present numerous challenges in theory and in numerical approximation. In particular, self-diffusion is a ... More
Phase transition in a network model of social balance with Glauber dynamicsJul 17 2019We study the evolution of a social network with friendly/enmity connections into a balanced state by introducing a dynamical model with an intrinsic randomness, similar to Glauber dynamics in statistical mechanics. We include the possibility of the tension ... More
Signal Reconstruction from Rechargeable Wireless Sensor Networks using Sparse Random ProjectionsOct 16 2013Apr 15 2014Due to non-homogeneous spread of sunlight, sensing nodes possess non-uniform energy budget in recharge- able Wireless Sensor Networks (WSNs). An energy-aware workload distribution strategy is therefore nec- essary to achieve good data accuracy subject ... More
Context dependent preferential attachment model for complex networksJan 10 2015In this paper, we propose a growing random complex network model, which we call context dependent preferential attachment model (CDPAM), when the preference of a new node to get attached to old nodes is determined by the local and global property of the ... More
Risk Sensitive Portfolio Optimization in a Jump Diffusion Model with RegimesMar 30 2016Jan 05 2018This article studies a portfolio optimization problem, where the market consisting of several stocks is modeled by a multi-dimensional jump-diffusion process with age-dependent semi-Markov modulated coefficients. We study risk sensitive portfolio optimization ... More
A Proposal for Aleph_o Extended Supersymmetry in Integrable SystemsOct 20 1995Utilizing techniques suggested by the recently obtained construction of off-shell spinning particles, we propose the arbitrary $N$-extension of supersymmetry for the KdV system. It is further suggested that the ${\aleph}_0$ extension for the SKdV system ... More
Tuning the RADIO to the Off-Shell 2D Fayet Hypermultiplet ProblemFeb 14 1996We show via use of the RADIO technique that an off-shell (4,0) version of the hypermultiplet, in the form first proposed by Fayet, exists and contains 28 - 28 component fields. The off-shell structure uncovered is found to include a chiral truncation ... More
Ferromagnetism in CaRuO3 thin films by efficient route of tensile epitaxial strainJan 12 2013We show that a ferromagnetic (FM) order in the orthorhombic CaRuO3, which is a non-magnetic and iso-structural analog of FM system SrRuO3, can be established and stabilized by the means of tensile epitaxial strain. Investigations on the structural and ... More
Multi-color Cavity MetrologyMay 07 2012May 24 2012Long baseline laser interferometers used for gravitational wave detection have proven to be very complicated to control. In order to have sufficient sensitivity to astrophysical gravitational waves, a set of multiple coupled optical cavities comprising ... More
In-situ characterization of the thermal state of resonant optical interferometers via tracking of their higher-order mode resonancesFeb 08 2015Thermal lensing in resonant optical interferometers such as those used for gravitational wave detection is a concern due to the negative impact on control signals and instrument sensitivity. In this paper we describe a method for monitoring the thermal ... More
Lattice Boltzmann - Langevin simulations of binary mixturesApr 01 2011Aug 10 2011We report a hybrid numerical method for the solution of the model H fluctuating hydrodynamic equations for binary mixtures. The momentum conservation equations with Landau-Lifshitz stresses are solved using the fluctuating lattice Boltzmann equation while ... More
A graph theoretical approach to states and unitary operationsFeb 27 2015Jul 28 2016Building upon our previous work, on graphical representation of a quantum state by signless Laplacian matrix, we pose the following question. If a local unitary operation is applied to a quantum state, represented by a signless Laplacian matrix, what ... More
Quantum discord of states arising from graphsFeb 21 2017Quantum discord refers to an important aspect of quantum correlations for bipartite quantum systems. In our earlier works we have shown that corresponding to every graph (combinatorial) there are quantum states whose properties are reflected in the structure ... More
Linear eigenvalue statistics of random matrices with a variance profileJan 27 2019We give an upper bound on the total variation distance between the linear eigenvalue statistic, properly scaled and centred, of a random matrix with a variance profile and the standard Gaussian random variable. The second order Poincar\'e inequality type ... More
Ciliary oscillations without external friction near the instability thresholdApr 16 2019Active filaments are prototypical engines of motility at the micron scale. Their motion in viscous fluids is determined by the balance of external drag and internal structural stress. The latter contains both active and passive components that, respectively, ... More
Chemical potential for light by parametric couplingMay 22 2014Dec 11 2015Usually photons are not conserved in their interaction with matter. Consequently, for the thermodynamics of photons, while we have a concept of temperature for energy conservation, there is no equivalent chemical potential for particle number conservation. ... More
Condition for zero and non-zero discord in graph Laplacian quantum statesMay 02 2017Apr 05 2019This work is at the interface of graph theory and quantum mechanics. Quantum correlations epitomize the usefulness of quantum mechanics. Quantum discord is an interesting facet of bipartite quantum correlations. Earlier, it was shown that every combinatorial ... More
Dynamics of an Ion Coupled to a Parametric Superconducting CircuitApr 15 2015Apr 16 2016Superconducting circuits and trapped ions are promising architectures for quantum information processing. However, the natural frequencies for controlling these systems -- radio frequency ion control and microwave domain superconducting qubit control ... More
Engineering three-body interaction and Pfaffian states in circuit QED systemsAug 01 2013We demonstrate a scheme to engineer the three-body interaction in circuit-QED systems by tuning a fluxonium qubit. Connecting such qubits in a square lattice and controlling the tunneling dynamics, in the form of a synthesized magnetic field, for the ... More
Countering Adversarial Images using Input TransformationsOct 31 2017Jan 25 2018This paper investigates strategies that defend against adversarial-example attacks on image-classification systems by transforming the inputs before feeding them to the system. Specifically, we study applying image transformations such as bit-depth reduction, ... More
Two-Loop QCD Corrections to Higgs $\rightarrow b + \bar{b} + g$ AmplitudeMay 09 2014Aug 19 2014Exclusive observables involving Higgs boson in association with jets are often well suited to study the Higgs boson properties. They are rates involving cuts on the final state jets or differential distributions of rapidity, transverse momentum of the ... More
Higgs Rapidity Distribution in $b {\bar b}$ Annihilation at Threshold in N$^{3}$LO QCDNov 19 2014We present the rapidity distribution of the Higgs boson produced through bottom quark annihilation at third order in QCD using the threshold approximation. We provide a framework, based on the factorization properties of the QCD amplitudes along with ... More
Effects of forest fire severity on terrestrial carbon emission and ecosystem production in the Himalayan region, IndiaMay 27 2018Remote sensing techniques have been used effectively for measuring the overall loss of terrestrial ecosystem production and biodiversity due to the forest fire. The current research focuses on assessing the impact of forest fire severity on terrestrial ... More
Multi-objective Bayesian optimisation with preferences over objectivesFeb 12 2019We present a Bayesian multi-objective optimisation algorithm that allows the user to express preference-order constraints on the objectives of the type `objective A is more important than objective B'. Rather than attempting to find a representative subset ... More
Current reversal in interacting colloids under time-periodic driveJun 21 2018Dec 05 2018Using molecular dynamics simulations, we study particle-transport in a system of interacting colloidal particles on a ring, where the system is driven by a time-dependent external potential, moving along the ring. We consider two driving protocols: (i) ... More
Three loop heavy quark form factors and their asymptotic behaviorJun 13 2019A summary of the calculation of the color-planar and complete light quark contributions to the massive three-loop form factors is presented. Here a novel calculation method for the Feynman integrals is used, solving general uni-variate first order factorizable ... More
Towards a first design of a Newtonian-noise cancellation system for Advanced LIGOJun 06 2016Newtonian gravitational noise from seismic fields is predicted to be a limiting noise source at low frequency for second generation gravitational-wave detectors. Mitigation of this noise will be achieved by Wiener filtering using arrays of seismometers ... More
Rationale in Development Chat Messages: An Exploratory StudyApr 27 2017Chat messages of development teams play an increasingly significant role in software development, having replaced emails in some cases. Chat messages contain information about discussed issues, considered alternatives and argumentation leading to the ... More
Logarithmic coherence: Operational interpretation of $\ell_1$-norm coherenceDec 29 2016Dec 04 2017We show that the distillable coherence---which is equal to the relative entropy of coherence---is, up to a constant factor, always bounded by the $\ell_1$-norm measure of coherence (defined as the sum of absolute values of off diagonals). Thus the latter ... More
Three loop QCD corrections to heavy quark form factorsMay 09 2019Higher order calculations in perturbative Quantum Field Theories often produce coupled linear systems of differential equations which factorize to first order. Here we present an algorithm to solve such systems in terms of iterated integrals over an alphabet ... More
Taxonomy of Digital Forensics: Investigation Tools and ChallengesAug 17 2017In today's world of computers, any kind of information can be made available within few clicks for different endeavors. The information may be tampered by changing the statistical properties and can be further used for criminal activities. These days, ... More
It's the Human that Matters: Accurate User Orientation Estimation for Mobile Computing ApplicationsNov 08 2014Ubiquity of Internet-connected and sensor-equipped portable devices sparked a new set of mobile computing applications that leverage the proliferating sensing capabilities of smart-phones. For many of these applications, accurate estimation of the user ... More
Co-Clustering via Information-Theoretic Markov AggregationJan 02 2018Jun 15 2018We present an information-theoretic cost function for co-clustering, i.e., for simultaneous clustering of two sets based on similarities between their elements. By constructing a simple random walk on the corresponding bipartite graph, our cost function ... More
A Generalized Framework for Kullback-Leibler Markov AggregationSep 18 2017This paper proposes an information-theoretic cost function for aggregating a Markov chain via a (possibly stochastic) mapping. The cost function is motivated by two objectives: 1) The process obtained by observing the Markov chain through the mapping ... More
Afterglow Observations of Fermi-LAT Gamma-Ray Bursts and the Emerging Class of Hyper-Energetic EventsApr 16 2010Apr 19 2010We present broadband (radio, optical, and X-ray) light curves and spectra of the afterglows of four long-duration gamma-ray bursts (GRBs 090323, 090328, 090902B, and 090926A) detected by the Gamma-Ray Burst Monitor (GBM) and Large Area Telescope (LAT) ... More
Effect of strong $\bar{p}-$p nuclear forces on the rate of the low-energy three-body protonium formation reaction: $\bar{p} + {H}_μ(1s) \rightarrow (\bar{p} {p})_α + μ^-$Jun 04 2016Aug 03 2016The effect of the strong $\bar{\rm p}-$p nuclear interaction in a three-charge-particle system with arbitrary masses is investigated. Specifically, the ($\bar{\rm p},\ \mu^-$,\ p) system is considered, where $\bar{p}$ is an antiproton, $\mu^-$ is a muon ... More
Determinantal point processes in the plane from products of random matricesAug 30 2013Oct 21 2013We show the density of eigenvalues for three classes of random matrix ensembles is determinantal. First we derive the density of eigenvalues of product of $k$ independent $n\times n$ matrices with i.i.d. complex Gaussian entries with a few of matrices ... More
Instrumental vetoes for transient gravitational-wave triggers using noise-coupling models: The bilinear-coupling vetoMar 06 2014May 27 2014LIGO and Virgo recently completed searches for gravitational waves at their initial target sensitivities, and soon Advanced LIGO and Advanced Virgo will commence observations with even better capabilities. In the search for short duration signals, such ... More
Nonthermal $CP$ violation in soft leptogenesisJan 26 2015May 04 2015Soft leptogenesis is a mechanism which generates the matter-antimatter asymmetry of the Universe via the out-of-equilibrium decays of heavy sneutrinos in which soft supersymmetry breaking terms play two important roles: they provide the required $CP$ ... More
Flow-induced phase separation of active particles is controlled by boundary conditionsOct 27 2017Apr 29 2018Active particles, including swimming microorganisms, autophoretic colloids and droplets, are known to self-organize into ordered structures at fluid-solid boundaries. The entrainment of particles in the attractive parts of their spontaneous flows has ... More
Form Factors and Generalized Parton Distributions of Heavy Quarkonia in Basis Light Front QuantizationSep 17 2018We calculate the electromagnetic (charge, magnetic and quadrupole) form factors and the associated static moments of heavy quarkonia (charmonia and bottomonia) using the Basis Light Front Quantization (BLFQ) approach. For this work, we adopt light front ... More
Non-renewal statistics in the catalytic activity of enzyme molecules at mesoscopic concentrationsOct 27 2011Recent fluorescence spectroscopy measurements of single-enzyme kinetics have shown that enzymatic turnovers form a renewal stochastic process in which the inverse of the mean waiting time between turnovers follows the Michaelis-Menten equation. Under ... More
Small global solutions to the damped two-dimensional Boussinesq equationsAug 08 2013The two-dimensional (2D) incompressible Euler equations have been thoroughly investigated and the resolution of the global (in time) existence and uniqueness issue is currently in a satisfactory status. In contrast, the global regularity problem concerning ... More
On weighted zero-sum sequencesMar 10 2010Dec 01 2011Let G be a finite additive abelian group with exponent exp(G)=n>1 and let A be a nonempty subset of {1,...,n-1}. In this paper, we investigate the smallest positive integer $m$, denoted by s_A(G), such that any sequence {c_i}_{i=1}^m with terms from G ... More
A Cost-based Storage Format Selector for Materialization in Big Data FrameworksJun 11 2018Modern big data frameworks (such as Hadoop and Spark) allow multiple users to do large-scale analysis simultaneously. Typically, users deploy Data-Intensive Workflows (DIWs) for their analytical tasks. These DIWs of different users share many common parts ... More
Deep Learning Techniques for Improving Digital Gait SegmentationJul 09 2019Wearable technology for the automatic detection of gait events has recently gained growing interest, enabling advanced analyses that were previously limited to specialist centres and equipment (e.g., instrumented walkway). In this study, we present a ... More
Gait Velocity Estimation using time interleaved between Consecutive Passive IR Sensor ActivationsOct 18 2013Dec 01 2015Gait velocity has been consistently shown to be an important indicator and predictor of health status, especially in older adults. It is often assessed clinically, but the assessments occur infrequently and do not allow optimal detection of key health ... More
Ferromagnetic spin fluctuations in the filled skutterudite SrFe4As12 revealed by 75As NMR-NQR measurementsOct 18 2018$^{75}$As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been carried out to investigate the magnetic and electronic properties of the filled skutterudite metallic compound SrFe$_4$As$_{12}$. The temperature ... More
Fast Exciton Annihilation by Capture of Electrons or Holes by Defects via Auger Scattering in Monolayer Metal DichalcogenidesOct 12 2014Dec 08 2014The strong Coulomb interactions and the small exciton radii in two-dimensional metal dichalcogenides can result in very fast capture of electrons and holes of excitons by mid-gap defects from Auger processes. In the Auger processes considered here, an ... More
Evaluating the Performance of BSBL Methodology for EEG Source Localization On a Realistic Head ModelApr 27 2015Source localization in EEG represents a high dimensional inverse problem, which is severely ill-posed by nature. Fortunately, sparsity constraints have come into rescue as it helps solving the ill-posed problems when the signal is sparse. When the signal ... More
EEG source localization using a sparsity prior based on Brodmann areasJun 10 2014Localizing the sources of electrical activity in the brain from Electroencephalographic (EEG) data is an important tool for non-invasive study of brain dynamics. Generally, the source localization process involves a high-dimensional inverse problem that ... More
Sparse Bayesian Learning for EEG Source LocalizationJan 19 2015Purpose: Localizing the sources of electrical activity from electroencephalographic (EEG) data has gained considerable attention over the last few years. In this paper, we propose an innovative source localization method for EEG, based on Sparse Bayesian ... More
Ear-Phone: A Context-Aware Noise Mapping using Smart PhonesOct 16 2013A noise map facilitates the monitoring of environmental noise pollution in urban areas. However, state-of-the-art techniques for rendering noise maps in urban areas are expensive and rarely updated, as they rely on population and traffic models rather ... More
Optimal Control and Analysis of a Modified Trojan Y-Chromosome StrategyJul 08 2019The Trojan Y Chromosome (TYC) Strategy is a promising eradication method that attempts to manipulate the female to male ratio to promote the reduction of the population of an invasive species. The manipulation stems from an introduction of sex-reversed ... More
Higgs pair production from bottom quark annihilation to NNLO in QCDNov 05 2018May 31 2019We present the first results on the two-loop massless QCD corrections to the four-point amplitude $b+\overline{b} \rightarrow H+H$ in the five flavor scheme, treating bottom quarks as massless. This amplitude is sensitive to the trilinear Higgs boson ... More
Three loop form factors of a massive spin-2 particle with nonuniversal couplingNov 30 2016Mar 08 2017We investigate the interaction of spin-2 fields with those of Standard Model in a model independent framework. We have considered interactions where the spin-2 fields couple to two sets of gauge invariant tensorial operators that are not conserved unlike ... More
Controlling of ZnO nanostructures morphology for guiding the structural and optical propertiesAug 31 2017Most of the applications of the nano structures dependent on the morphology which affects the opto electronics properties. This research article provides a pathway of guiding optical properties like band-gap and fluorescence properties by controlled growth ... More
Thermodynamic Screening of Metal-Substituted MOFs for Carbon CaptureMar 10 2016Metal-organic frameworks (MOFs) have emerged as promising materials for carbon capture applications due to their high CO2 capacities and tunable properties. Amongst the many possible MOFs, metal-substituted compounds based on M-DOBDC and M-HKUST-1 have ... More
High Dimensional Bayesian Optimization Using DropoutFeb 15 2018Scaling Bayesian optimization to high dimensions is challenging task as the global optimization of high-dimensional acquisition function can be expensive and often infeasible. Existing methods depend either on limited active variables or the additive ... More
Remarkably high value of Capacitance in BiFeO3 NanorodSep 23 2013A remarkably high value of specific capacitance of 450 F/g has been observed through electrochemical measurements in the electrode made of multiferroic Bismuth Ferrite (BFO) in the form of nanorods protruding out. These BFO nanorods were developed on ... More