Search results for "difference"

showing 10 items of 1534 documents

Synchronizing Quantum Harmonic Oscillators through Two-Level Systems

2017

Two oscillators coupled to a two-level system which in turn is coupled to an infinite number of oscillators (reservoir) are considered, bringing to light the occurrence of synchronization. A detailed analysis clarifies the physical mechanism that forces the system to oscillate at a single frequency with a predictable and tunable phase difference. Finally, the scheme is generalized to the case of $N$ oscillators and $M(<N)$ two-level systems.

PhysicsPhase differenceInfinite numberQuantum PhysicsSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciSynchronizingFOS: Physical sciencesTopology01 natural sciencesAtomic and Molecular Physics and OpticsSettore FIS/03 - Fisica Della Materia010305 fluids & plasmasSynchronization (alternating current)0103 physical sciencesTurn (geometry)010306 general physicsQuantum Physics (quant-ph)QuantumHarmonic oscillator
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Non-leptonic decays of Charmed mesons into two Pseudoscalars

2015

We examine the role of resonant coupled channel final state interactions (FSI), as well as weak annihilation and exchange contributions in explaining all the two body hadronic $D\rightarrow PP$ decay modes data. In the un-unitarized amplitudes we include modified Wilson coefficients with non-factorizable corrections as parameters. For the hadronic form factors, the z-series expansion method is used to get the $q^2$ dependence. The FSI effects are incorporated via a phenomenological approach with widths of resonances to various channels taken from observations where available, and others as additional parameters to be determined from fits of all the theoretical rates to the measured ones. Ou…

PhysicsPhase differenceNuclear and High Energy PhysicsParticle physicsAnnihilationMesonBranching fractionHadronHigh Energy Physics::PhenomenologyFOS: Physical sciencesState (functional analysis)High Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)High Energy Physics - PhenomenologyAmplitudeHigh Energy Physics - Phenomenology (hep-ph)
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Branching fraction measurement ofB¯0→D(*)+π−andB−→D(*)0π−and isospin analysis ofB¯→D(*)πdecays

2007

Using 65 X 10(6) Y (4S) -> BB events collected with the BABAR detector at the PEP-II e(+) e(-) storage ring at the Stanford Linear Accelerator Center, we measure the color-favored branching fractions B(B-0 -> D+ pi(-)) = (2.55 +/- 0.05 +/- 0.16) X 10(-3), B(B-0 -> D*(+) pi(-)) = (2.79 +/- 0.08 +/- 0.17) X 10(-3), B(B- -> D-0 pi(-)) = (4.90 +/- 0.07 +/- 0.22) X 10(-3) and B(B- -> D*(0)pi(-)) = (5.52 +/- 0.17 +/- 0.42) X 10(-3), where the first error is statistical and the second is systematic. With these results and the current world average for the branching fraction for the color-suppressed decay B-0 -> D-(*()0)pi(0), the cosines of the strong phase difference delta between the I =1/2 and …

PhysicsPhase differenceNuclear and High Energy PhysicsPi system010308 nuclear & particles physicsBranching fractionElectron–positron annihilationAnalytical chemistry01 natural sciencesParticle identificationNuclear physicsIsospin0103 physical sciencesPiB meson010306 general physicsPhysical Review D
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A STRAIN-DIFFERENCE BASED NONLOCAL ELASTICITY THEORY FOR SMALL-SCALE SHEAR-DEFORMABLE BEAMS WITH PARAMETRIC WARPING

2020

PhysicsShear (geology)Computer Networks and CommunicationsControl and Systems EngineeringComputational MechanicsMechanicsStrain differenceImage warpingParametric statisticsInternational Journal for Multiscale Computational Engineering
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Soil ionization in earth electrodes by a finite difference time domain scheme

2004

This paper proposes a finite difference time domain numerical scheme devoted to analyze the transient behavior of earth electrodes during the soil breakdown that can take place when a surge current has to be drained. To this aim, Maxwell's equations together with a space-time variable resistivity function are used. The model has been validated by comparing the computed results with data available in the technical literature. Simulation results related to complex earth electrodes of limited extension are reported. Electrodes of larger extension can be easily simulated but requiring more computational resources.

PhysicsVariable (computer science)symbols.namesakeMaxwell's equationsElectrical resistivity and conductivityIonizationFinite-difference time-domain methodElectronic engineeringsymbolsFunction (mathematics)Transient (oscillation)MechanicsSurge
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Broadband printed dipole with integrated via-hole balun for WiMAX applications

2010

A broadband balanced printed dipole antenna for WiMAX applications (2.5/3.6 GHz) is presented. An integrated via-hole balun is used to feed the antenna and a Yagi-like scheme is proposed to improve the gain. The design has been optimized by means of parametric FDTD simulations. The antenna was fabricated and measured, giving a bandwidth higher than 50% and a gain higher than 4 dBi. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:52–55, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25671

Physicsbusiness.industryBandwidth (signal processing)Electrical engineeringFinite-difference time-domain methodCondensed Matter PhysicsWiMAXAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionDipoleBalunlawBroadbandElectronic engineeringDipole antennaElectrical and Electronic EngineeringbusinessMicrowaveMicrowave and Optical Technology Letters
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Counter-propagating difference frequency mixing in diamond with terahertz waves

2013

We investigate four-wave mixing between terahertz and optical pulses in diamond. We observe the occurrence of sum and difference frequency generation, with the latter being phase-matched for terahertz pulses counter-propagating to the optical field.

Physicsbusiness.industryTerahertz radiationDifference-frequency generationTerahertznonlinear opticsPhysics::OpticsNonlinear opticsDiamondOptical fieldengineering.materialSettore ING-INF/01 - ElettronicaOptical fieldOptical pumpingFour-wave mixingOpticsCross-polarized wave generationengineeringDifference-frequency mixingOptoelectronicsTera HertzbusinessCounterpropagatingMixing (physics)
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Coupled fluid-flow and magnetic-field simulation of the Riga dynamo experiment

2006

Magnetic fields of planets, stars, and galaxies result from self-excitation in moving electroconducting fluids, also known as the dynamo effect. This phenomenon was recently experimentally confirmed in the Riga dynamo experiment [ A. Gailitis et al., Phys. Rev. Lett. 84, 4365 (2000) ; A. Gailitis et al., Physics of Plasmas 11, 2838 (2004) ], consisting of a helical motion of sodium in a long pipe followed by a straight backflow in a surrounding annular passage, which provided adequate conditions for magnetic-field self-excitation. In this paper, a first attempt to simulate computationally the Riga experiment is reported. The velocity and turbulence fields are modeled by a finite-volume Navi…

Physicsplasma simulationfinite volume methodsTurbulenceMechanicsCondensed Matter Physicsplasma transport processesMagnetic fieldPhysics::Fluid DynamicsCoupling (physics)Classical mechanicsFlow velocityplasma turbulenceDynamo theoryFluid dynamicsMagnetohydrodynamicsNavier-Stokes equationsplasma magnetohydrodynamicsfinite difference methodsDynamo
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Numerical Study of Forced MHD Convection Flow and Temperature Around Periodically Placed Cylinders

2016

In this paper we consider 2D stationary boundary value problems for the system of magnetohydrodynamic (MHD) equations and the heat transfer equation. The viscous electrically conducting incompressible liquid moves between infinite cylinders with square or round sections placed periodically. We also consider similar 2D MHD channel flow with periodically placed obstacles on the channel walls. We analyse the 2D forced and free MHD convection flow and temperature around cylinders and obstacles in homogeneous external magnetic field. The cylinders, obstacles and walls of the channel with constant temperature are heated. The distributions of electromagnetic fields, forces, velocity and temperatur…

Physics::Fluid DynamicsElectromagnetic fieldPhysicsCombined forced and natural convectionHeat transferFinite differenceBoundary value problemMagnetohydrodynamic driveMechanicsMagnetohydrodynamicsOpen-channel flow
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Bubble motion through non-crimp fabrics during composites manufacturing

2008

Bubbles motion through interbundle channels in biaxial non-crimp fabrics is modelled. The scenario is that formed bubbles move with the resin through these channels and are trapped if the channels become too narrow. By usage of a permeability network model, existing criteria on bubble deformation and a variety of analytical and probabilistic methods it is found that the paths of the bubbles depend significantly on the position of the threads keeping the fabric together and the number of fibres crossing the interbundle channels. Another result is that the pressure difference over a trapped bubble increases with 50% in a 3D geometry possible helping the bubble to escape. A third result is tha…

Physics::Fluid DynamicsVoid (astronomy)Materials scienceTransfer moldingMechanics of MaterialsBubbleCeramics and CompositesCrimpFluid mechanicsComposite materialPorosityNetwork modelPressure differenceComposites Part A: Applied Science and Manufacturing
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