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2014-02-26 | Comparison of methods for numerical calculation of continuum damping | Continuum resonance damping is an important factor in determining the
stability of certain global modes in fusion plasmas. A number of analytic and
numerical approaches have been developed to compute this damping, particularly
in the case of the toroidicity-induced shear Alfv\'en eigenmode. This paper
compares results ... | 1402.6389v1 |
2014-05-16 | Quantum corrections to nonlinear ion acoustic wave with Landau damping | Quantum corrections to nonlinear ion acoustic wave with Landau damping have
been computed using Wigner equation approach. The dynamical equation governing
the time development of nonlinear ion acoustic wave with semiclassical quantum
corrections is shown to have the form of higher KdV equation which has higher
order no... | 1405.4107v1 |
2014-05-19 | Mesh Size and Damped Edge Effects in Micromagnetic Spin Wave Simulation | We have studied the dependence of spin wave dispersion on the characteristics
of the mesh used in a finite element micromagnetic simulation. It is shown that
the dispersion curve has a cut off at a frequency which is analytically
predictable. The frequency depends on the average mesh length used for the
simulation. Bas... | 1405.4615v2 |
2014-07-08 | Fourier-Hermite spectral representation for the Vlasov-Poisson system in the weakly collisional limit | We study Landau damping in the 1+1D Vlasov-Poisson system using a
Fourier-Hermite spectral representation. We describe the propagation of free
energy in phase space using forwards and backwards propagating Hermite modes
recently developed for gyrokinetics [Schekochihin et al. (2014)]. The change in
the electric field c... | 1407.1932v1 |
2014-08-15 | Linear hyperbolic equations with time-dependent propagation speed and strong damping | We consider a second order linear equation with a time-dependent coefficient
c(t) in front of the "elastic" operator. For these equations it is well-known
that a higher space-regularity of initial data compensates a lower
time-regularity of c(t).
In this paper we investigate the influence of a strong dissipation, nam... | 1408.3499v1 |
2014-08-14 | Particle Dynamics in Damped Nonlinear Quadrupole Ion Traps | We examine the motions of particles in quadrupole ion traps as a function of
damping and trapping forces, including cases where nonlinear damping or
nonlinearities in the electric field geometry play significant roles. In the
absence of nonlinearities, particles are either damped to the trap center or
ejected, while th... | 1409.6262v1 |
2015-01-03 | Finite-Parameters Feedback Control for Stabilizing Damped Nonlinear Wave Equations | In this paper we introduce a finite-parameters feedback control algorithm for
stabilizing solutions of various classes of damped nonlinear wave equations.
Specifically, stabilization the zero steady state solution of initial boundary
value problems for nonlinear weakly and strongly damped wave equations,
nonlinear wave... | 1501.00556v1 |
2015-06-26 | A Universal Damping Mechanism of Quantum Vibrations in Deep Sub-Barrier Fusion Reactions | We demonstrate the damping of quantum octupole vibrations near the touching
point when two colliding nuclei approach each other in the mass-asymmetric
$^{208}$Pb + $^{16}$O system, for which the strong fusion hindrance was clearly
observed. We, for the first time, apply the random-phase approximation method
to the heav... | 1506.07963v1 |
2015-07-28 | Phenomenology of chiral damping in noncentrosymmetric magnets | A phenomenology of magnetic chiral damping is proposed in the context of
magnetic materials lacking inversion symmetry breaking. We show that the
magnetic damping tensor adopts a general form that accounts for a component
linear in magnetization gradient in the form of Lifshitz invariants. We propose
different microsco... | 1507.07762v1 |
2015-08-06 | Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics | A phenomenological equation called Landau-Lifshitz-Baryakhtar (LLBar)
equation, which could be viewed as the combination of Landau-Lifshitz (LL)
equation and an extra "exchange damping" term, was derived by Baryakhtar using
Onsager's relations. We interpret the origin of this "exchange damping" as
nonlocal damping by l... | 1508.01478v1 |
2016-01-05 | Vlasov Simulations of Electron-Ion Collision Effects on Damping of Electron Plasma Waves | Collisional effects can play an essential role in the dynamics of plasma
waves by setting a minimum damping rate and by interfering with wave-particle
resonances. Kinetic simulations of the effects of electron-ion pitch angle
scattering on Electron Plasma Waves (EPWs) are presented here. In particular,
the effects of s... | 1601.01002v1 |
2016-02-13 | The effect of orbital damping during planet migration on the Inclination and Eccentricity Distributions of Neptune Trojans | We explore planetary migration scenarios for formation of high inclination
Neptune Trojans (NTs) and how they are affected by the planetary migration of
Neptune and Uranus. If Neptune and Uranus's eccentricity and inclination were
damped during planetary migration, then their eccentricities and inclinations
were higher... | 1602.04303v1 |
2016-03-08 | Damping of the Higgs and Nambu-Goldstone modes of superfluid Bose gases at finite temperatures | We study collective modes of superfluid Bose gases in optical lattices at
commensurate fillings. We focus on the vicinity of the quantum phase transition
to the Mott insulator, where there exists the Higgs amplitude mode in addition
to the Nambu-Goldstone phase mode associated with the spontaneous U(1) symmetry
breakin... | 1603.02395v1 |
2016-04-12 | Offline software for the DAMPE experiment | A software system has been developed for the DArk Matter Particle Explorer
(DAMPE) mission, a satellite-based experiment. The DAMPE software is mainly
written in C++ and steered using Python script. This article presents an
overview of the DAMPE offline software, including the major architecture design
and specific imp... | 1604.03219v6 |
2016-04-18 | Stabilization of Damped Waves on Spheres and Zoll Surfaces of Revolution | We study the strong stabilization of wave equations on some sphere-like
manifolds, with rough damping terms which do not satisfy the geometric control
condition posed by Rauch-Taylor and Bardos-Lebeau-Rauch. We begin with an
unpublished result of G. Lebeau, which states that on S^d , the indicator
function of the upper... | 1604.05218v2 |
2016-07-25 | Damping of parametrically excited magnons in the presence of the longitudinal spin Seebeck effect | The impact of the longitudinal spin Seebeck effect (LSSE) on the magnon
damping in magnetic-insulator/nonmagnetic-metal bilayers was recently discussed
in several reports. However, results of those experiments can be blurred by
multimode excitation within the measured linewidth. In order to avoid possible
intermodal in... | 1607.07274v1 |
2016-07-27 | Frequency dispersion of small-amplitude capillary waves in viscous fluids | This work presents a detailed study of the dispersion of capillary waves with
small amplitude in viscous fluids using an analytically derived solution to the
initial value problem of a small-amplitude capillary wave as well as direct
numerical simulation. A rational parametrization for the dispersion of
capillary waves... | 1607.08266v1 |
2016-10-18 | On the stability of the Bresse system with frictional damping | In this paper, we consider the Bresse system with frictional damping terms
and prove some optimal decay results for the $L^2$-norm of the solution and its
higher order derivatives. In fact, if we consider just one damping term acting
on the second equation of the solution, we show that the solution does not
decay at al... | 1610.05500v2 |
2017-01-12 | Blow-up for semilinear wave equations with the scale invariant damping and super-Fujita exponent | The blow-up for semilinear wave equations with the scale invariant damping
has been well-studied for sub-Fujita exponent. However, for super-Fujita
exponent, there is only one blow-up result which is obtained in 2014 by
Wakasugi in the case of non-effective damping. In this paper we extend his
result in two aspects by ... | 1701.03232v3 |
2017-02-17 | Transition of multi-diffusive states in a biased periodic potential | We study a frequency-dependent damping model of hyper-diffusion within the
generalized Langevin equation. The model allows for the colored noise defined
by its spectral density, assumed to be proportional to $\omega^{\delta-1}$ at
low frequencies with $0<\delta<1$ (sub-Ohmic damping) or $1<\delta<2$
(super-Ohmic dampin... | 1702.05370v1 |
2017-09-27 | Wave turbulence in vibrating plates : the effect of damping | The effect of damping in the wave turbulence regime for thin vibrating plates
is studied. An experimental method, allowing measurements of dissipation in the
system at all scales, is first introduced. Practical experimental devices for
increasing the dissipation are used. The main observable consequence of
increasing t... | 1709.09438v1 |
2017-11-02 | Vibration Damping of Carbon Nanotube Assembly Materials | Vibration reduction is of great importance in various engineering
applications, and a material that exhibits good vibration damping along with
high strength and modulus has become more and more vital. Owing to the superior
mechanical property of carbon nanotube (CNT), new types of vibration damping
material can be deve... | 1711.00623v1 |
2017-12-05 | Dark Matter Annihilation from Nearby Ultra-compact Micro Halos to Explain the Tentative Excess at ~1.4 TeV in DAMPE data | The tentative 1.4 TeV excess in the $e^+e^-$ spectrum measured by The DArk
Matter Particle Explorer (DAMPE) motivates the possible existence of one or
more local dark matter concentrated regions. In particular, Ultra-compact Micro
Halos (UCMHs) seeded by large density perturbations in the early universe,
allocated with... | 1712.01724v2 |
2017-12-21 | A new charge reconstruction algorithm for the DAMPE silicon microstrip detector | The DArk Matter Particle Explorer (DAMPE) is one of the four satellites
within the Strategic Pioneer Research Program in Space Science of the Chinese
Academy of Science (CAS). The Silicon-Tungsten Tracker (STK), which is composed
of 768 singled-sided silicon microstrip detectors, is one of the four
subdetectors in DAMP... | 1712.08011v1 |
2018-01-23 | The dominancy of damping like torque for the current induced magnetization switching in Pt/Co/W multilayers | Two classes of spin-orbit coupling (SOC) mechanisms have been considered as
candidate sources for the spin orbit torque (SOT): the spin Hall Effect (SHE)
in heavy metals with strong SOC and the Rashba effect arising from broken
inversion symmetry at material surfaces and interfaces. In this work, we have
investigated t... | 1801.07408v1 |
2018-02-20 | The damped wave equation with unbounded damping | We analyze new phenomena arising in linear damped wave equations on unbounded
domains when the damping is allowed to become unbounded at infinity. We prove
the generation of a contraction semigroup, study the relation between the
spectra of the semigroup generator and the associated quadratic operator
function, the con... | 1802.07026v1 |
2018-04-06 | Exponential Integrators Preserving Local Conservation Laws of PDEs with Time-Dependent Damping/Driving Forces | Structure-preserving algorithms for solving conservative PDEs with added
linear dissipation are generalized to systems with time-dependent
damping/driving terms. This study is motivated by several PDE models of
physical phenomena, such as Korteweg-de Vries, Klein-Gordon, Schr\"{o}dinger,
and Camassa-Holm equations, all... | 1804.02266v1 |
2018-05-29 | Enhancing precision of damping rate by PT symmetric Hamiltonian | We utilize quantum Fisher information to investigate the damping parameter
precision of a dissipative qubit. PT symmetric non-Hermitian Hamiltonian is
used to enhance the parameter precision in two models: one is direct PT
symmetric quantum feedback; the other is that the damping rate is encoded into
a effective PT sym... | 1805.11216v1 |
2018-05-31 | Damping Effect on PageRank Distribution | This work extends the personalized PageRank model invented by Brin and Page
to a family of PageRank models with various damping schemes. The goal with
increased model variety is to capture or recognize a larger number of types of
network activities, phenomena and propagation patterns. The response in
PageRank distribut... | 1806.00127v1 |
2018-08-10 | Relativistic charge solitons created due to nonlinear Landau damping: A candidate for explaining coherent radio emission in pulsars | A potential resolution for the generation of coherent radio emission in
pulsar plasma is the existence of relativistic charge solitons, which are
solutions of nonlinear Schr\"{o}dinger equation (NLSE). In an earlier study,
Melikidze et al. (2000) investigated the nature of these charge solitons;
however, their analysis... | 1808.03657v1 |
2018-11-21 | Super Damping of Mechanical Vibrations | We report the phenomenon of coherent super decay, where a linear sum of
several damped oscillators can collectively decay much faster than the
individual ones in the first stage, followed by stagnating ones after more than
90 percent of the energy has already been dissipated. The parameters of the
damped oscillators fo... | 1811.08621v2 |
2018-11-29 | Flowing fibers as a proxy of turbulence statistics | The flapping states of a flexible fiber fully coupled to a three-dimensional
turbulent flow are investigated via state-of-the-art numerical methods. Two
distinct flapping regimes are predicted by the phenomenological theory recently
proposed by Rosti et al. [Phys. Rev. Lett. 121, 044501, 2018]: the under-damped
regime,... | 1811.12023v2 |
2018-11-29 | The Lugiato-Lefever equation with nonlinear damping caused by two photon absorption | In this paper we investigate the effect of nonlinear damping on the
Lugiato-Lefever equation $$ \i \partial_t a = -(\i-\zeta) a - da_{xx}
-(1+\i\kappa)|a|^2a +\i f $$ on the torus or the real line. For the case of the
torus it is shown that for small nonlinear damping $\kappa>0$ stationary
spatially periodic solutions ... | 1811.12200v3 |
2018-11-26 | Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality | The dynamics of electron-plasma waves are described at arbitrary
collisionality by considering the full Coulomb collision operator. The
description is based on a Hermite-Laguerre decomposition of the velocity
dependence of the electron distribution function. The damping rate, frequency,
and eigenmode spectrum of electr... | 1811.12855v2 |
2019-01-17 | Influences of interfacial oxidization on surface magnetic energy, magnetic damping and spin-orbit-torques in Pt / ferromagnet / capping structures | We investigate the effect of capping layer (CAP) on the interfacial magnetic
anisotropy energy density (K_S), magnetic damping ({\alpha}), and spin-orbit
torques (SOTs) in heavy-metal (Pt) / ferromagnet (Co or Py) / CAP (MgO/Ta,
HfOx, or TaN). At room temperature (RT) the CAP materials influence the
effective magnitude... | 1901.05777v1 |
2019-05-31 | The amplitude of solar p-mode oscillations from three-dimensional convection simulations | The amplitude of solar p-mode oscillations is governed by stochastic
excitation and mode damping, both of which take place in the surface convection
zone. However, the time-dependent, turbulent nature of convection makes it
difficult to self-consistently study excitation and damping processes through
the use of traditi... | 1905.13397v2 |
2019-10-03 | Many-body collision contributions to electron momentum damping rates in a plasma influenced by electron strong coupling | Experimental studies of electron-ion collision rates in an ultracold neutral
plasma (UNP) can be conducted through measuring the rate of electron plasma
oscillation damping. For sufficiently cold and dense conditions where strong
coupling influences are important, the measured damping rate was faster by 37\%
than theor... | 1910.01707v1 |
2019-10-18 | Escape of a forced-damped particle from weakly nonlinear truncated potential well | Escape from a potential well is an extreme example of transient behavior. We
consider the escape of the harmonically forced particle under viscous damping
from the benchmark truncated weakly nonlinear potential well. Main attention is
paid to most interesting case of primary 1:1 resonance. The treatment is based
on mul... | 1910.08545v1 |
2019-10-24 | Topological damping Rashba spin orbit torque in ballistic magnetic domain walls | Rashba spin orbit torque derived from the broken inversion symmetry at
ferromagnet/heavy metal interfaces has potential application in spintronic
devices. In conventional description of the precessional and damping components
of the Rashba spin orbit torque in magnetization textures, the decomposition
coefficients are ... | 1910.10977v2 |
2019-11-13 | Dipole oscillations of fermionic superfluids along the BEC-BCS crossover in disordered potentials | We investigate dipole oscillations of ultracold Fermi gases along the BEC-BCS
crossover through disordered potentials. We observe a disorder-induced damping
of oscillations as well as a change of the fundamental Kohn-mode frequency. The
measurement results are compared to numerical density matrix renormalization
group ... | 1911.05638v1 |
2020-02-07 | Model of damping and anisotropy at elevated temperatures: application to granular FePt films | Understanding the damping mechanism in finite size systems and its dependence
on temperature is a critical step in the development of magnetic
nanotechnologies. In this work, nano-sized materials are modeled via atomistic
spin dynamics, the damping parameter being extracted from Ferromagnetic
Resonance (FMR) simulation... | 2002.02865v1 |
2020-04-06 | Damping-like Torque in Monolayer 1T-TaS$_2$ | A damping-like spin orbit torque (SOT) is a prerequisite for ultralow power
spin logic devices. Here, we report on the damping-like SOT in just one
monolayer of the conducting transition metal dichalcogenide (TMD) TaS$_2$
interfaced with a NiFe (Py) ferromagnetic layer. The charge-spin conversion
efficiency is found to... | 2004.02649v1 |
2020-05-15 | Calibration and performance of the neutron detector onboard of the DAMPE mission | The DArk Matter Particle Explorer (DAMPE), one of the four space-based
scientific missions within the framework of the Strategic Pioneer Program on
Space Science of the Chinese Academy of Sciences, has been successfully
launched on Dec. 17th 2015 from Jiuquan launch center. One of the most
important scientific goals of... | 2005.07828v1 |
2020-05-16 | Simultaneous observation of anti-damping and inverse spin Hall effect in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/Pt bilayer system | Manganites have shown potential in spintronics because they exhibit high spin
polarization. Here, by ferromagnetic resonance we have studied the damping
properties of La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/Pt bilayers which are prepared by
oxide molecular beam epitaxy. The damping coefficient ($\alpha$) of
La$_{0.67}$Sr$_{0.3... | 2005.07848v3 |
2020-07-16 | Linearized wave-damping structure of Vlasov-Poisson in $\mathbb R^3$ | In this paper we study the linearized Vlasov-Poisson equation for localized
disturbances of an infinite, homogeneous Maxwellian background distribution in
$\mathbb R^3_x \times \mathbb R^3_v$. In contrast with the confined case
$\mathbb T^d _x \times \mathbb R_v ^d$, or the unconfined case $\mathbb R^d_x
\times \mathbb... | 2007.08580v1 |
2020-07-25 | Using a Lindbladian approach to model decoherence in two coupled nuclear spins via correlated phase-damping and amplitude damping noise channels | In this work, we studied the relaxation dynamics of coherences of different
order present in a system of two coupled nuclear spins. We used a previously
designed model for intrinsic noise present in such systems which considers the
Lindblad master equation for Markovian relaxation. We experimentally created
zero-, sing... | 2007.12972v1 |
2020-09-29 | The effects of nonlinear damping on degenerate parametric amplification | This paper considers the dynamic response of a single degree of freedom
system with nonlinear stiffness and nonlinear damping that is subjected to both
resonant direct excitation and resonant parametric excitation, with a general
phase between the two. This generalizes and expands on previous studies of
nonlinear effec... | 2009.14284v2 |
2020-11-10 | Damped oscillators within the general theory of Casimir and van der Waals forces | It is demonstrated that the general theory of Casimir and van der Waals
forces describes the interaction-induced equilibrium thermodynamic potentials
of the damped harmonic oscillator bilinearly coupled to the environment. An
extended model for a damped oscillator is suggested along the lines of the
general theory of C... | 2011.04960v2 |
2020-11-16 | Technology to Counter Online Flaming Based on the Frequency-Dependent Damping Coefficient in the Oscillation Model | Online social networks, which are remarkably active, often experience
explosive user dynamics such as online flaming, which can significantly impact
the real world. However, countermeasures based on social analyses of the
individuals causing flaming are too slow to be effective because of the
rapidity with which the in... | 2011.08117v1 |
2021-01-03 | The effect of flow on resonant absorption of slow MHD waves in magnetic flux tubes | In this paper, we study kink and sausage oscillations in the presence of
longitudinal background flow. We study resonant absorption of the kink and
sausage modes in the slow continuum under magnetic pore conditions in the
presence of flow. we determine the dispersion relation then solve it
numerically, and find the fre... | 2101.02064v1 |
2021-02-01 | Blow-up and lifespan estimates for a damped wave equation in the Einstein-de Sitter spacetime with nonlinearity of derivative type | In this article, we investigate the blow-up for local solutions to a
semilinear wave equation in the generalized Einstein - de Sitter spacetime with
nonlinearity of derivative type. More precisely, we consider a semilinear
damped wave equation with a time-dependent and not summable speed of
propagation and with a time-... | 2102.01137v2 |
2021-02-02 | Analysis of Lower Hybrid Drift Waves in Kappa Distributions over Solar Atmosphere | Kappa distributions and with loss cone features have been frequently observed
with flares emissions with the signatures of Lower hybrid waves. We have
analysed the plasma with Kappa distributions and with loss cone features for
the drift wave instabilities in perpendicular propagation for Large flare and
Normal flare a... | 2102.01323v1 |
2021-02-25 | Regularity and stability of the semigroup associated with some interacting elastic systems I: A degenerate damping case | In this paper, we examine regularity and stability issues for two damped
abstract elastic systems. The damping involves the average velocity and a
fractional power $\theta$, with $\theta$ in $[-1,1]$, of the principal
operator. The matrix operator defining the damping mechanism for the coupled
system is degenerate. Fir... | 2102.13217v4 |
2021-03-05 | Existence and congruence of global attractors for damped and forced integrable and nonintegrable discrete nonlinear Schrödinger equations | We study two damped and forced discrete nonlinear Schr\"odinger equations on
the one-dimensional infinite lattice. Without damping and forcing they are
represented by the integrable Ablowitz-Ladik equation (AL) featuring non-local
cubic nonlinear terms, and its standard (nonintegrable) counterpart with local
cubic nonl... | 2103.03533v1 |
2021-05-17 | Dissipation of Oscillation Energy and Distribution of Damping Power in a Multimachine Power System: A Small-signal Analysis | This paper revisits the concept of damping torque in a multimachine power
system and its relation to the dissipation of oscillation energy in synchronous
machine windings. As a multimachine extension of an existing result on a
single-machine-infinite-bus (SMIB) system, we show that the total damping power
for a mode st... | 2105.07618v2 |
2021-06-04 | Imaging spin-wave damping underneath metals using electron spins in diamond | Spin waves in magnetic insulators are low-damping signal carriers that could
enable a new generation of spintronic devices. The excitation, control, and
detection of spin waves by metal electrodes is crucial for interfacing these
devices to electrical circuits. It is therefore important to understand
metal-induced damp... | 2106.02508v2 |
2021-06-04 | Inherent Non-Linear Damping in Resonators with Inertia Amplification | Inertia amplification is a mechanism coupling degrees of freedom within a
vibrating structure. Its goal is to achieve an apparent high dynamic mass and,
accordingly, a low resonance frequency. Such structures have been described for
use in locally resonant metamaterials and phononic crystals to lower the
starting frequ... | 2106.02576v2 |
2021-06-30 | On the effect of perturbations in first-order optimization methods with inertia and Hessian driven damping | Second-order continuous-time dissipative dynamical systems with viscous and
Hessian driven damping have inspired effective first-order algorithms for
solving convex optimization problems. While preserving the fast convergence
properties of the Nesterov-type acceleration, the Hessian driven damping makes
it possible to ... | 2106.16159v2 |
2021-07-13 | A new approach to the quantization of the damped harmonic oscillator | In this paper, a new approach for constructing Lagrangians for driven and
undriven linearly damped systems is proposed, by introducing a redefined time
coordinate and an associated coordinate transformation to ensure that the
resulting Lagrangian satisfies the Helmholtz conditions. The approach is
applied to canonicall... | 2107.05827v3 |
2021-10-26 | Theory of sound attenuation in amorphous solids from nonaffine motions | We present a theoretical derivation of acoustic phonon damping in amorphous
solids based on the nonaffine response formalism for the viscoelasticity of
amorphous solids. The analytical theory takes into account the nonaffine
displacements in transverse waves and is able to predict both the ubiquitous
low-energy diffusi... | 2110.13446v2 |
2021-11-21 | Energy Transport in 1-Dimensional Oscillator Arrays With Hysteretic Damping | Energy transport in 1-dimensional oscillator arrays has been extensively
studied to date in the conservative case, as well as under weak viscous
damping. When driven at one end by a sinusoidal force, such arrays are known to
exhibit the phenomenon of supratransmission, i.e. a sudden energy surge above a
critical drivin... | 2111.10816v3 |
2021-12-15 | An Innovative Transverse Emittance Cooling Technique using a Laser-Plasma Wiggler | We propose an innovative beam cooling scheme based on laser driven plasma
wakefields to address the challenge of high luminosity generation for a future
linear collider. For linear colliders, beam cooling is realised by means of
damping rings equipped with wiggler magnets and accelerating cavities. This
scheme ensures ... | 2112.08163v1 |
2021-12-21 | ISS-Based Robustness to Various Neglected Damping Mechanisms for the 1-D Wave PDE | This paper is devoted to the study of the robustness properties of the 1-D
wave equation for an elastic vibrating string under four different damping
mechanisms that are usually neglected in the study of the wave equation: (i)
friction with the surrounding medium of the string (or viscous damping), (ii)
thermoelastic p... | 2112.11287v1 |
2022-01-20 | Derivation of the linear Boltzmann equation from the damped quantum Lorentz gas with a general scatterer configuration | It is a fundamental problem in mathematical physics to derive macroscopic
transport equations from microscopic models. In this paper we derive the linear
Boltzmann equation in the low-density limit of a damped quantum Lorentz gas for
a large class of deterministic and random scatterer configurations. Previously
this re... | 2201.08229v2 |
2022-01-22 | Effect of MagneticField on the Damping Behavior of a Ferrofluid based Damper | This paper is an extension of our earlier work where we had reported a proof
of concept for a ferrofluid based damper. The damper used ferrofluid as damping
medium and it was seen that damping efficiency of the damper changes on
application of magnetic field. The present paper deals with a systematic study
of the effec... | 2201.09027v1 |
2022-01-28 | Machine learning-based method of calorimeter saturation correction for helium flux analysis with DAMPE experiment | DAMPE is a space-borne experiment for the measurement of the cosmic-ray
fluxes at energies up to around 100 TeV per nucleon. At energies above several
tens of TeV, the electronics of DAMPE calorimeter would saturate, leaving
certain bars with no energy recorded. In the present work we discuss the
application of machine... | 2201.12185v3 |
2022-03-10 | Accelerated gradient methods combining Tikhonov regularization with geometric damping driven by the Hessian | In a Hilbert setting, for convex differentiable optimization, we consider
accelerated gradient dynamics combining Tikhonov regularization with
Hessian-driven damping. The Tikhonov regularization parameter is assumed to
tend to zero as time tends to infinity, which preserves equilibria. The
presence of the Tikhonov regu... | 2203.05457v2 |
2022-04-01 | On the Importance of High-Frequency Damping in High-Order Conservative Finite-Difference Schemes for Viscous Fluxes | This paper discusses the importance of high-frequency damping in high-order
conservative finite-difference schemes for viscous terms in the Navier-Stokes
equations. Investigating nonlinear instability encountered in a high-resolution
viscous shock-tube simulation, we have discovered that a modification to the
viscous s... | 2204.00393v1 |
2022-06-20 | Stability and Damping in the Disks of Massive Galaxies | After their initial formation, disk galaxies are observed to be rotationally
stable over periods of >6 Gyr, implying that any large velocity disturbances of
stars and gas clouds are damped rapidly on the timescale of their rotation.
However, it is also known that despite this damping, there must be a degree of
random l... | 2206.09671v2 |
2022-08-25 | The Effect of Frequency Droop Damping on System Parameters and Battery Sizing During Load Change Condition | Inverter-based resources (IBR) have been widely studied for their advantages
on the current power systems. This increase in the penetration of renewable
energy has raised some concerns about the stability of the existing grid.
Historically, power systems are dominated by synchronous generators that can
easily react to ... | 2208.12291v1 |
2022-09-15 | Superfluid $^4$He as a rigorous test bench for different damping models in nanoelectromechanical resonators | We have used nanoelectromechanical resonators to probe superfluid $^4$He at
different temperature regimes, spanning over four orders of magnitude in
damping. These regimes are characterized by the mechanisms which provide the
dominant contributions to damping and the shift of the resonance frequency:
tunneling two leve... | 2209.07229v2 |
2022-11-08 | On the injection scale of the turbulence in the partially ionized very local interstellar medium | The cascade of magnetohydrodynamic (MHD) turbulence is subject to ion-neutral
collisional damping and neutral viscous damping in the partially ionized
interstellar medium. By examining the damping effects in the warm and partially
ionized local interstellar medium, we find that the interstellar turbulence is
damped by ... | 2211.04496v1 |
2022-12-11 | The overtone level spacing of a black hole quasinormal frequencies: a fingerprint of a local $SL(2,\mathbb{R})$ symmetry | The imaginary part of the quasinormal frequencies spectrum for a static and
spherically symmetric black hole is analytically known to be equally spaced,
both for the highly damped and the weakly damped families of quasinormal modes.
Some interesting attempts have been made in the last twenty years to understand
in simp... | 2212.05538v1 |
2022-12-15 | Formation of shifted shock for the 3D compressible Euler equations with time-dependent damping | In this paper, we show the shock formation to the compressible Euler
equations with time-dependent damping $\frac{a\p u}{(1+t)^{\lam}}$ in three
spatial dimensions without any symmetry conditions. It's well-known that for
$\lam>1$, the damping is too weak to prevent the shock formation for suitably
large data. However,... | 2212.07828v1 |
2023-01-15 | Damped-driven system of bouncing droplets leading to deterministic diffusive behavior | Damped-driven systems are ubiquitous in science, however the damping and
driving mechanisms are often quite convoluted. This manuscript presents an
experimental and theoretical investigation of a fluidic droplet on a vertically
vibrating fluid bath as a damped-driven system. We study a fluidic droplet in
an annular cav... | 2301.06041v2 |
2023-03-01 | Generation of intraparticle quantum correlations in amplitude damping channel and its robustness | Quantum correlations between two or more different degrees of freedom of the
same particle is sometimes referred to as intraparticle entanglement. In this
work, we study these intra-particle correlations between two different degrees
of freedom under various decoherence channels viz. amplitude damping,
depolarising and... | 2303.01238v1 |
2023-03-16 | Quantum Brownian Motion in the Caldeira-Leggett Model with a Damped Environment | We model a quantum system coupled to an environment of damped harmonic
oscillators by following the approach of Caldeira-Leggett and adopting the
Caldirola-Kanai Lagrangian for the bath oscillators. In deriving the master
equation of the quantum system of interest (a particle in a general potential),
we show that the p... | 2303.09516v1 |
2023-03-22 | A Numerical Study of Landau Damping with PETSc-PIC | We present a study of the standard plasma physics test, Landau damping, using
the Particle-In-Cell (PIC) algorithm. The Landau damping phenomenon consists of
the damping of small oscillations in plasmas without collisions. In the PIC
method, a hybrid discretization is constructed with a grid of finitely
supported basis... | 2303.12620v1 |
2023-04-07 | Shifted shock formation for the 3D compressible Euler equations with damping and variation of the vorticity | In this paper, we consider the shock formation problem for the
3-dimensional(3D) compressible Euler equations with damping inspired by the
work \cite{BSV3Dfulleuler}. It will be shown that for a class of large data,
the damping can not prevent the formation of point shock, and the damping
effect shifts the shock time a... | 2304.03506v2 |
2023-07-05 | Bayesian evidence for two slow-wave damping models in hot coronal loops | We compute the evidence in favour of two models, one based on field-aligned
thermal conduction alone and another that includes thermal misbalance as well,
in explaining the damping of slow magneto-acoustic waves in hot coronal loops.
Our analysis is based on the computation of the marginal likelihood and the
Bayes fact... | 2307.02439v1 |
2023-07-24 | From characteristic functions to multivariate distribution functions and European option prices by the damped COS method | We provide a unified framework for the computation of the distribution
function and the computation of prices of financial options from the
characteristic function of some density by the COS method. The classical COS
method is numerically very efficient in one-dimension but cannot deal very well
with certain financial ... | 2307.12843v6 |
2023-07-26 | A Nonlinear Damped Metamaterial: Wideband Attenuation with Nonlinear Bandgap and Modal Dissipation | In this paper, we incorporate the effect of nonlinear damping with the
concept of locally resonant metamaterials to enable vibration attenuation
beyond the conventional bandgap range. The proposed design combines a linear
host cantilever beam and periodically distributed inertia amplifiers as
nonlinear local resonators... | 2307.14165v2 |
2023-07-28 | Premature jump-down mimicks nonlinear damping in nanoresonators | Recent experiments on nano-resonators in a bistable regime use the
`jump-down' point between states to infer mechanical properties of the membrane
or a load, but often suggest the presence of some nonlinear damping. Motivated
by such experiments, we develop a mechanical model of a membrane subject to a
uniform, oscilla... | 2307.15656v1 |
2023-09-22 | Long time energy averages and a lower resolvent estimate for damped waves | We consider the damped wave equation on a compact manifold. We propose
different ways of measuring decay of the energy (time averages of lower energy
levels, decay for frequency localized data...) and exhibit links with resolvent
estimates on the imaginary axis. As an application we prove a universal
logarithmic lower ... | 2309.12709v1 |
2023-10-11 | Damping Density of an Absorptive Shoebox Room Derived from the Image-Source Method | The image-source method is widely applied to compute room impulse responses
(RIRs) of shoebox rooms with arbitrary absorption. However, with increasing RIR
lengths, the number of image sources grows rapidly, leading to slow
computation. In this paper, we derive a closed-form expression for the damping
density, which ch... | 2310.07363v1 |
2023-10-14 | Exploring Damping Effect of Inner Control Loops for Grid-Forming VSCs | This paper presents an analytical approach to explore the damping effect of
inner loops on grid-forming converters. First, an impedance model is proposed
to characterize the behaviors of inner loops, thereby illustrating their
influence on output impedance shaping. Then, based on the impedance
representation, the compl... | 2310.09660v1 |
2023-10-24 | Frictional weakening of a granular sheared layer due to viscous rolling revealed by Discrete Element Modeling | Considering a 3D sheared granular layer modeled with discrete elements, it is
well known the rolling resistance significantly influences the mechanical
behavior. Even if the rolling resistance role has been deeply investigated as
it is commonly used to represent the the roughness of the grains and the
interparticle loc... | 2310.15945v1 |
2023-12-12 | Coordination of Damping Controllers: A Data-Informed Approach for Adaptability | This work proposes a data-informed approach for an adaptable coordination of
damping controllers. The novel concept of coordination is based on minimizing
the Total Action, a single metric that measures the system's dynamic response
post-disturbance. This is a performance measure based on the physics of the
power syste... | 2312.07739v1 |
2024-01-26 | Efficient Control of Magnetization Dynamics Via W/CuO$_\text{x}$ Interface | Magnetization dynamics, which determine the speed of magnetization switching
and spin information propagation, play a central role in modern spintronics.
Gaining its control will satisfy the different needs of various spintronic
devices. In this work, we demonstrate that the surface oxidized Cu
(CuO$_\text{x}$) can be ... | 2401.14708v1 |
2024-02-08 | The stability analysis based on viscous theory of Faraday waves in Hele-Shaw cells | The linear instability of Faraday waves in Hele-Shaw cells is investigated
with consideration of the viscosity of fluids after gap-averaging the governing
equations due to the damping from two lateral walls and the dynamic behavior of
contact angle. A new hydrodynamic model is thus derived and solved
semi-analytically.... | 2402.05505v2 |
2024-02-09 | Damping of density oscillations from bulk viscosity in quark matter | We study the damping of density oscillations in the quark matter phase that
might occur in compact stars. To this end we compute the bulk viscosity and the
associated damping time in three-flavor quark matter, considering both
nonleptonic and semileptonic electroweak processes. We use two different
equations of state o... | 2402.06595v1 |
2003-08-05 | Reliability of Calderbank-Shor-Steane Codes and Security of Quantum Key Distribution | After Mayers (1996, 2001) gave a proof of the security of the
Bennett-Brassard 1984 (BB84) quantum key distribution protocol, Shor and
Preskill (2000) made a remarkable observation that a Calderbank-Shor-Steane
(CSS) code had been implicitly used in the BB84 protocol, and suggested its
security could be proven by bound... | 0308029v6 |
2011-07-13 | (In-)Stability of Singular Equivariant Solutions to the Landau-Lifshitz-Gilbert Equation | In this paper we use formal asymptotic arguments to understand the stability
proper- ties of equivariant solutions to the Landau-Lifshitz-Gilbert model for
ferromagnets. We also analyze both the harmonic map heatflow and Schrodinger
map flow limit cases. All asymptotic results are verified by detailed numerical
experim... | 1107.2620v1 |
1996-09-10 | The Damping Tail of CMB Anisotropies | By decomposing the damping tail of CMB anisotropies into a series of transfer
functions representing individual physical effects, we provide ingredients that
will aid in the reconstruction of the cosmological model from small-scale CMB
anisotropy data. We accurately calibrate the model-independent effects of
diffusion ... | 9609079v1 |
1997-09-16 | Lyman-alpha emission as a tool to study high redshift damped systems | We report a quantitative study of the escape of Lyman-alpha photons from an
inhomogeneous optically thick medium that mimics the structure of damped
Lyman-alpha absorbers. Modeling the optically thick disk with 3 components
(massive stars and HII regions, dust, and neutral hydrogen), we study the
resulting emission lin... | 9709150v1 |
1997-10-17 | The chemical evolution of galaxies causing damped Ly$α$ absorption | We have compiled all available data on chemical abundances in damped Lyman
alpha absorption systems for comparison with results from our combined chemical
and spectrophotometric galaxy evolution models. Preliminary results from
chemically consistent calculations are in agreement with observations of damped
Ly$\alpha$ s... | 9710193v1 |
1998-01-26 | Are Damped Lyman alpha Systems Rotating Disks ? | We report on high spectral resolution observations of five damped Lyman alpha
systems whose line velocity profiles and abundances are analyzed. By combining
these data with information from the literature, we study the kinematics of the
low and high ionization phases of damped systems and discuss the possibility
that p... | 9801243v1 |
2001-10-29 | Damping of inhomogeneities in neutralino dark matter | The lightest supersymmetric particle, most likely the neutralino, might
account for a large fraction of dark matter in the Universe. We show that the
primordial spectrum of density fluctuations in neutralino cold dark matter
(CDM) has a sharp cut-off due to two damping mechanisms: collisional damping
during the kinetic... | 0110601v1 |
2002-08-03 | Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations | The adiabatic index Gamma_1 for perturbations of dense matter is studied
under various physical conditions which can prevail in neutron star cores. The
dependence of Gamma_1 on the composition of matter (in particular, on the
presence of hyperons), on the stellar pulsation amplitude, and on the baryon
superfluidity is ... | 0208078v1 |
2003-01-07 | Damping of Neutron Star Shear Modes by Superfluid Friction | The forced motion of superfluid vortices in shear oscillations of rotating
solid neutron star matter produces damping of the mode. A simple model of the
unpinning and repinning processes is described, with numerical calculations of
the consequent energy decay times. These are of the order of 1 s or more for
typical ano... | 0301112v1 |
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