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2022-11-16 | Controlling the motional quality factor of a diamagnetically levitated graphite plate | Researchers seek methods to levitate matter for a wide variety of purposes,
ranging from exploring fundamental problems in science, through to developing
new sensors and mechanical actuators. Many levitation techniques require active
driving and most can only be applied to objects smaller than a few micrometers.
Diamag... | 2211.08764v1 |
2022-12-03 | Strong On-Chip Microwave Photon-Magnon Coupling Using Ultra-low Damping Epitaxial Y3Fe5O12 Films at 2 Kelvin | Y3Fe5O12 is arguably the best magnetic material for magnonic quantum
information science (QIS) because of its extremely low damping. We report
ultralow damping at 2 K in epitaxial Y3Fe5O12 thin films grown on a diamagnetic
Y3Sc2Ga3O12 substrate that contains no rare-earth elements. Using these
ultralow damping YIG film... | 2212.01708v1 |
2022-12-21 | Fractional damping effects on the transient dynamics of the Duffing oscillator | We consider the nonlinear Duffing oscillator in presence of fractional
damping which is characteristic in different physical situations. The system is
studied with a smaller and larger damping parameter value, that we call the
underdamped and overdamped regimes. In both we have studied the relation
between the fraction... | 2212.11023v1 |
2023-01-02 | Fast convex optimization via closed-loop time scaling of gradient dynamics | In a Hilbert setting, for convex differentiable optimization, we develop a
general framework for adaptive accelerated gradient methods. They are based on
damped inertial dynamics where the coefficients are designed in a closed-loop
way. Specifically, the damping is a feedback control of the velocity, or of the
gradient... | 2301.00701v1 |
2023-01-19 | Damped harmonic oscillator revisited: the fastest route to equilibrium | Theoretically, solutions of the damped harmonic oscillator asymptotically
approach equilibrium, i.e., the zero energy state, without ever reaching it
exactly, and the critically damped solution approaches equilibrium faster than
the underdamped or the overdamped solution. Experimentally, the systems
described with this... | 2301.08222v2 |
2023-02-24 | Asymptotic behaviour of the semidiscrete FE approximations to weakly damped wave equations with minimal smoothness on initial data | Exponential decay estimates of a general linear weakly damped wave equation
are studied with decay rate lying in a range. Based on the $C^0$-conforming
finite element method to discretize spatial variables keeping temporal variable
continuous, a semidiscrete system is analysed, and uniform decay estimates are
derived w... | 2302.12476v1 |
2023-02-27 | Nonlinear acoustic imaging with damping | In this paper, we consider an inverse problem for a nonlinear wave equation
with a damping term and a general nonlinear term. This problem arises in
nonlinear acoustic imaging and has applications in medical imaging and other
fields. The propagation of ultrasound waves can be modeled by a quasilinear
wave equation with... | 2302.14174v1 |
2023-04-11 | Sizable suppression of magnon Hall effect by magnon damping in Cr$_2$Ge$_2$Te$_6$ | Two-dimensional (2D) Heisenberg honeycomb ferromagnets are expected to have
interesting topological magnon effects as their magnon dispersion can have
Dirac points. The Dirac points are gapped with finite second nearest neighbor
Dzyaloshinskii-Moriya interaction, providing nontrivial Berry curvature with
finite magnon ... | 2304.04922v1 |
2023-04-22 | Video analysis of the damped oscillations of Pohl's pendulum | In this paper problems that arose with the introduction of distance learning
in physics at the Technical University of Sofia due to the COVID-19 pandemic
and the imposition of video recording of laboratory exercises are indicated. It
was found that the video for the ''Damped Mechanical Oscillations'' exercise
provides ... | 2304.11390v1 |
2023-05-22 | Semi-active damping optimization of vibrational systems using the reduced basis method | In this article, we consider vibrational systems with semi-active damping
that are described by a second-order model. In order to minimize the influence
of external inputs to the system response, we are optimizing some damping
values. As minimization criterion, we evaluate the energy response, that is the
$\cH_2$-norm ... | 2305.12946v1 |
2023-06-01 | A combined volume penalization / selective frequency damping approach for immersed boundary methods: application to moving geometries | This work extends, to moving geometries, the immersed boundary method based
on volume penalization and selective frequency damping approach [J. Kou, E.
Ferrer, A combined volume penalization/selective frequency damping approach for
immersed boundary methods applied to high-order schemes, Journal of
Computational Physic... | 2306.00504v1 |
2023-06-09 | Damped nonlinear Schrödinger equation with Stark effect | We study the $L^2$-critical damped NLS with a Stark potential. We prove that
the threshold for global existence and finite time blowup of this equation is
given by $\|Q\|_2$, where $Q$ is the unique positive radial solution of $\Delta
Q + |Q|^{4/d} Q = Q$ in $H^1(\mathbb{R}^d)$. Moreover, in any small
neighborhood of $... | 2306.05931v1 |
2023-06-19 | New Perspectives and Systematic Approaches for Analyzing Negative Damping-Induced Sustained Oscillation | Sustained oscillations (SOs) are commonly observed in systems dominated by
converters. Under specific conditions, even though the origin of SOs can be
identified through negative damping modes using conventional linear analysis,
utilizing the describing function to compute harmonic amplitude and frequency
remains incom... | 2306.10839v2 |
2023-06-24 | Numerical approximation of the invariant distribution for a class of stochastic damped wave equations | We study a class of stochastic semilinear damped wave equations driven by
additive Wiener noise. Owing to the damping term, under appropriate conditions
on the nonlinearity, the solution admits a unique invariant distribution. We
apply semi-discrete and fully-discrete methods in order to approximate this
invariant dist... | 2306.13998v1 |
2023-07-31 | Estimation of Power in the Controlled Quantum Teleportation through the Witness Operator | Controlled quantum teleportation (CQT) can be considered as a variant of
quantum teleportation in which three parties are involved where one party acts
as the controller. The usability of the CQT scheme depends on two types of
fidelities viz. conditioned fidelity and non-conditioned fidelity. The
difference between the... | 2307.16574v1 |
2023-08-03 | Triple-Spherical Bessel Function Integrals with Exponential and Gaussian Damping: Towards an Analytic N-Point Correlation Function Covariance Model | Spherical Bessel functions appear commonly in many areas of physics wherein
there is both translation and rotation invariance, and often integrals over
products of several arise. Thus, analytic evaluation of such integrals with
different weighting functions (which appear as toy models of a given physical
observable, su... | 2308.01955v2 |
2023-08-28 | Quantized damped transversal single particle mechanical waves | In information transfer, the dissipation of a signal may have crucial
importance. The feasibility of reconstructing the distorted signal also depends
on this. That is why the study of quantized dissipative transversal single
particle mechanical waves may have an important role. It may be true,
particularly on the nanos... | 2308.14820v1 |
2023-11-15 | Integrated Local Energy Decay for Damped Magnetic Wave Equations on Stationary Space-Times | We establish local energy decay for damped magnetic wave equations on
stationary, asymptotically flat space-times subject to the geometric control
condition. More specifically, we allow for the addition of time-independent
magnetic and scalar potentials, which negatively affect energy coercivity and
may add in unwieldy... | 2311.08628v1 |
2023-11-15 | Applications of $L^p-L^q$ estimates for solutions to semi-linear $σ$-evolution equations with general double damping | In this paper, we would like to study the linear Cauchy problems for
semi-linear $\sigma$-evolution models with mixing a parabolic like damping term
corresponding to $\sigma_1 \in [0,\sigma/2)$ and a $\sigma$-evolution like
damping corresponding to $\sigma_2 \in (\sigma/2,\sigma]$. The main goals are
on the one hand to... | 2311.09085v1 |
2023-11-23 | Friction of a driven chain: Role of momentum conservation, Goldstone and radiation modes | We analytically study friction and dissipation of a driven bead in a 1D
harmonic chain, and analyze the role of internal damping mechanism as well as
chain length. Specifically, we investigate Dissipative Particle Dynamics and
Langevin Dynamics, as paradigmatic examples that do and do not display
translational symmetry... | 2311.14075v1 |
2023-12-07 | Generalized Damping Torque Analysis of Ultra-Low Frequency Oscillation in the Jerk Space | Ultra low frequency oscillation (ULFO) is significantly threatening the power
system stability. Its unstable mechanism is mostly studied via generalized
damping torque analysis method (GDTA). However, the analysis still adopts the
framework established for low frequency oscillation. Hence, this letter
proposes a GDTA a... | 2312.04148v1 |
2023-12-08 | Selective damping of plasmons in coupled two-dimensional systems by Coulomb drag | The Coulomb drag is a many-body effect observed in proximized low-dimensional
systems. It appears as emergence of voltage in one of them upon passage of bias
current in another. The magnitude of drag voltage can be strongly affected by
exchange of plasmonic excitations between the layers; however, the reverse
effect of... | 2312.05097v1 |
2023-12-13 | Geometrical Interpretation of Neutrino Oscillation with decay | The geometrical representation of two-flavor neutrino oscillation represents
the neutrino's flavor eigenstate as a magnetic moment-like vector that evolves
around a magnetic field-like vector that depicts the Hamiltonian of the system.
In the present work, we demonstrate the geometrical interpretation of neutrino
in a ... | 2312.08178v1 |
2023-12-28 | Cause-effect relationship between model parameters and damping performance of hydraulic shock absorbers | Despite long-term research and development of modern shock absorbers, the
effect of variations of several crucial material and model parameters still
remains dubious. The goal of this work is therefore a study of the changes of
shock absorber dynamics with respect to typical parameter ranges in a realistic
model. We st... | 2312.17175v1 |
2024-01-04 | Simplified Information Geometry Approach for Massive MIMO-OFDM Channel Estimation -- Part II: Convergence Analysis | In Part II of this two-part paper, we prove the convergence of the simplified
information geometry approach (SIGA) proposed in Part I. For a general Bayesian
inference problem, we first show that the iteration of the common second-order
natural parameter (SONP) is separated from that of the common first-order
natural p... | 2401.02037v1 |
2024-01-04 | A Pure Integral-Type PLL with a Damping Branch to Enhance the Stability of Grid-Tied Inverter under Weak Grids | In a phase-locked loop (PLL) synchronized inverter, due to the strong
nonlinear coupling between the PLL's parame-ters and the operation power angle,
the equivalent damping coefficient will quickly deteriorate while the power
angle is close to 90{\deg} under an ultra-weak grid, which causes the
synchronous instability.... | 2401.02202v1 |
2024-01-05 | Solving convex optimization problems via a second order dynamical system with implicit Hessian damping and Tikhonov regularization | This paper deals with a second order dynamical system with a Tikhonov
regularization term in connection to the minimization problem of a convex
Fr\'echet differentiable function. The fact that beside the asymptotically
vanishing damping we also consider an implicit Hessian driven damping in the
dynamical system under s... | 2401.02676v1 |
2024-01-16 | Influence of temperature, doping, and amorphization on the electronic structure and magnetic damping of iron | Hybrid magnonic quantum systems have drawn increased attention in recent
years for coherent quantum information processing, but too large magnetic
damping is a persistent concern when metallic magnets are used. Their intrinsic
damping is largely determined by electron-magnon scattering induced by
spin-orbit interaction... | 2401.08076v1 |
2024-01-16 | Waves in strong centrifugal filed: dissipative gas | In the fast rotating gas (with the velocity typical for Iguassu gas
centrifuge) three families of linear waves exist with different polarizations
and law of dispersion. The energy of the waves is basically concentrated at the
axis of rotation in the rarefied region. Therefore these waves decay on the
distance comparabl... | 2401.08240v1 |
2024-03-19 | Polarization Dynamics in Paramagnet of Charged Quark-Gluon Plasma | It is commonly understood that the strong magnetic field produced in heavy
ion collisions is short-lived. The electric conductivity of the quark-gluon
plasma is unable to significantly extend the life time of magnetic field. We
propose an alternative scenario to achieve this: with finite baryon density and
spin polariz... | 2403.12615v1 |
2024-03-25 | Radiation damping of a Rayleigh scatterer illuminated by a plane wave | We investigate the radiation damping experienced by a dielectric spherical
particle when it is illuminated by an electromagnetic plane wave within the
Rayleigh regime. We derive the equivalent electric dipole of the moving
particle and subsequently calculate the electromagnetic force acting on it from
two different app... | 2403.16618v1 |
2024-04-10 | Decay characterization of solutions to semi-linear structurally damped $σ$-evolution equations with time-dependent damping | In this paper, we study the Cauchy problem to the linear damped
$\sigma$-evolution equation with time-dependent damping in the effective cases
\begin{equation*} u_{t t}+(-\Delta)^\sigma u+b(t)(-\Delta)^\delta u_t=0,
\end{equation*} and investigate the decay rates of the solution and its
derivatives that are expressed i... | 2404.06855v1 |
2021-04-27 | Some generalized geometric constants for discrete Morrey spaces | In this paper, we calculate four geometric constants for discrete Morrey
spaces. The constants are generalized von Neumann-Jordan constant, modified von
Neumann-Jordan constant, von Neumann-Jordan type constant, and Zb\"{a}ganu
constant. The four constants measure uniformly nonsquareness of the above
spaces. We obtain ... | 2104.12983v1 |
2006-04-14 | The UCSD Radio-Selected Quasar Survey for Damped Lyman alpha System | As large optical quasar surveys for damped Lya become a reality and the study
of star forming gas in the early Universe achieves statistical robustness, it
is now vital to identify and quantify the sources of systematic error. Because
the nature of optically-selected quasar surveys makes them vulnerable to dust
obscura... | 0604334v1 |
2012-04-12 | Evidence of Gunn-Peterson damping wings in high-z quasar spectra: strengthening the case for incomplete reionization | The spectra of several high-redshift (z>6) quasars have shown evidence for a
Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen
fraction (x_HI > 0.03) in the z ~ 6 intergalactic medium (IGM). However,
previous analyses assumed that the IGM was uniformly ionized outside of the
quasar's HII r... | 1204.2838v2 |
2013-05-31 | Highly inclined and eccentric massive planets I: Planet-disc interactions | In the Solar System, planets have a small inclination with respect to the
equatorial plane of the Sun, but there is evidence that in extrasolar systems
the inclination can be very high. This spin-orbit misalignment is unexpected,
as planets form in a protoplanetary disc supposedly aligned with the stellar
spin. Planet-... | 1305.7330v1 |
2020-08-05 | Fast optimization via inertial dynamics with closed-loop damping | In a Hilbert space $H$, in order to develop fast optimization methods, we
analyze the asymptotic behavior, as time $t$ tends to infinity, of inertial
continuous dynamics where the damping acts as a closed-loop control. The
function $f: H \to R$ to be minimized (not necessarily convex) enters the
dynamic through it grad... | 2008.02261v3 |
2023-01-10 | Cosmic Ray Drag and Damping of Compressive Turbulence | While it is well-known that cosmic rays (CRs) can gain energy from turbulence
via second order Fermi acceleration, how this energy transfer affects the
turbulent cascade remains largely unexplored. Here, we show that damping and
steepening of the compressive turbulent power spectrum are expected once the
damping time $... | 2301.04156v2 |
2024-02-12 | Relaxation of weakly collisional plasma: continuous spectra, Landau eigenmodes, and transition from the collisionless to the fluid limit | The relaxation of a weakly collisional plasma is described by the
Boltzmann-Poisson equations with the Lenard-Bernstein collision operator. We
perform a perturbative analysis of these equations, and obtain, for the first
time, exact analytic solutions, enabling definitive resolutions to
long-standing controversies rega... | 2402.07992v1 |
2008-03-25 | Is Planck's Constant h a "Quantum" Constant? | One should not confuse a physical constant with a theory which incorporates
the constant. Planck's constant h can appear in classical or quantum theories. | 0803.3612v1 |
1995-09-21 | Damped Lyman-alpha and Lyman Limit Absorbers in the Cold Dark Matter Model | We study the formation of damped \lya and Lyman limit absorbers in a
hierarchical clustering scenario using a gas dynamical simulation of an $\Omega
= 1$, cold dark matter universe. In the simulation, these high column density
systems are associated with forming galaxies. Damped \lya absorption, $N_{HI}
\simgt 10^{20.2... | 9509106v1 |
1995-09-21 | Nonlinear Damping of Oscillations in Tidal-Capture Binaries | We calculate the damping of quadrupole f and low order g modes (primary
modes) by nonlinear coupling to other modes of the star. This damping is orders
of magnitude more rapid than direct radiative damping when the primary
amplitude is large, as in tidal capture.
Primary modes destabilize high degree g-modes of half ... | 9509112v1 |
1997-08-12 | Spectroscopy of PKS 0528-260: New Limits on CO Absorption and Emission | We have obtained a moderate resolution spectrum of the quasar PKS 0528-250
with the Red Channel Spectrograph on the Multiple Mirror Telescope (MMT) in
order to study a damped Lyman alpha absorption line system at z = 2.8115.
We obtain a new upper limit for the CO column density for the z = 2.8108
velocity component i... | 9708104v1 |
1998-11-04 | GMRT Observations of Low z Damped Lyman-alpha Absorbers | We present Giant Metrewave Radio Telescope (GMRT) observations of redshifted
HI 21cm absorption in two low redshift (z=0.2212, z=0.0912) damped Lyman-alpha
systems seen towards the gigahertz peaked source OI 363 (z_em = 0.630). The
object at z=0.0912 is the lowest redshift damped Lyman-alpha system known to
date. Groun... | 9811068v1 |
2002-01-25 | Galaxies Associated with z~4 Damped Lya Systems: I. Imaging and Photometric Selection | This paper describes the acquisition and analysis of imaging data for the
identification of galaxies associated with z~4 damped Lya systems. We present
deep BRI images of three fields known to contain four z~4 damped systems. We
discuss the reduction and calibration of the data, detail the color criteria
used to identi... | 0201417v2 |
2002-02-25 | Eccentricity Evolution for Planets in Gaseous Disks | We investigate the hypothesis that interactions between a giant planet and
the disk from which it forms promote eccentricity growth. These interactions
are concentrated at discrete Lindblad and corotation resonances. Interactions
at principal Lindblad resonances cause the planet's orbit to migrate and open a
gap in the... | 0202462v1 |
2003-07-23 | Dusty Molecular Cloud Collapse in the Presence of Alfvén Waves | It has been shown that magnetic fields play an important role in the
stability of molecular clouds, mainly perpendicularly to the field direction.
However, in the parallel direction the stability is a serious problem still to
be explained. Interstellar turbulence may allow the generation of Alfv\'en
waves that propagat... | 0307411v1 |
2005-02-28 | Thermal Evolution of a Pulsating Neutron Star | We have derived a set of equations to describe the thermal evolution of a
neutron star which undergoes small-amplitude radial pulsations. We have taken
into account, in the frame of the General Theory of Relativity, the pulsation
damping due to the bulk and shear viscosity and the accompanying heating of the
star. The ... | 0502583v2 |
2005-05-02 | Collisionless Damping of Fast MHD Waves in Magneto-rotational Winds | We propose collisionless damping of fast MHD waves as an important mechanism
for the heating and acceleration of winds from rotating stars. Stellar rotation
causes magnetic field lines anchored at the surface to form a spiral pattern
and magneto-rotational winds can be driven. If the structure is a magnetically
dominat... | 0505013v5 |
2006-08-05 | The nature of damped Lyman alpha and sub-damped Lyman alpha absorbers | We present arguments based on the measured abundances in individual damped
Lyman alpha systems (DLAs) and sub-damped Lyman alpha systems (sub-DLAs), and
also the average abundances inferred in large samples of QSO absorption line
systems, to suggest that the amount of dust in intervening QSO absorbers is
small and is n... | 0608127v2 |
1999-02-01 | Damping Rates and Mean Free Paths of Soft Fermion Collective Excitations in a Hot Fermion-Gauge-Scalar Theory | We study the transport coefficients, damping rates and mean free paths of
soft fermion collective excitations in a hot fermion-gauge-scalar plasma with
the goal of understanding the main physical mechanisms that determine transport
of chirality in scenarios of non-local electroweak baryogenesis. The focus is
on identif... | 9902218v2 |
2002-08-29 | Some notes on ideology of waves in plasmas | Our last three papers provide an occasion to make some brief notes on
ideology of waves in plasmas and to rehabilitate Vlasov prescription to
calculate relevant logarithmically divergent integrals in the principal value
sense. In this approach asymptotical solutions of plasma oscillations are
selected according to self... | 0208098v7 |
2004-11-26 | Open quantum systems | The damping of the harmonic oscillator is studied in the framework of the
Lindblad theory for open quantum systems. A generalization of the fundamental
constraints on quantum mechanical diffusion coefficients which appear in the
master equation for the damped quantum oscillator is presented; the
Schr\"odinger, Heisenbe... | 0411189v1 |
2006-02-17 | Damped quantum harmonic oscillator | In the framework of the Lindblad theory for open quantum systems the damping
of the harmonic oscillator is studied. A generalization of the fundamental
constraints on quantum mechanical diffusion coefficients which appear in the
master equation for the damped quantum oscillator is presented; the
Schr\"odinger and Heise... | 0602149v1 |
2007-04-12 | The effect of the solar corona on the attenuation of small-amplitude prominence oscillations. I. Longitudinal magnetic field | Context. One of the typical features shown by observations of solar
prominence oscillations is that they are damped in time and that the values of
the damping times are usually between one and three times the corresponding
oscillatory period. However, the mechanism responsible for the attenuation is
still not well-know... | 0704.1566v2 |
2007-10-01 | Lyman-alpha Damping Wing Constraints on Inhomogeneous Reionization | One well-known way to constrain the hydrogen neutral fraction, x_H, of the
high-redshift intergalactic medium (IGM) is through the shape of the red
damping wing of the Lya absorption line. We examine this method's effectiveness
in light of recent models showing that the IGM neutral fraction is highly
inhomogeneous on l... | 0710.0371v1 |
2008-02-20 | The Effect of Charon's Tidal Damping on the Orbits of Pluto's Three Moons | Pluto's recently discovered minor moons, Nix and Hydra, have almost circular
orbits, and are nearly coplanar with Charon, Pluto's major moon. This is
surprising because tidal interactions with Pluto are too weak to damp their
eccentricities. We consider an alternative possibility: that Nix and Hydra
circularize their o... | 0802.2939v1 |
2008-03-18 | Non-adiabatic magnetohydrodynamic waves in a cylindrical prominence thread with mass flow | High-resolution observations show that oscillations and waves in prominence
threads are common and that they are attenuated in a few periods. In addition,
observers have also reported the presence of material flows in such prominence
fine-structures. Here we investigate the time damping of non-leaky oscillations
suppor... | 0803.2600v2 |
2008-05-22 | Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti:Sapphire laser fs spectroscopy | The use of femtosecond laser pulses generated by a Ti:Sapphire laser system
allows us to gain an insight into the magnetization dynamics on time scales
from sub-picosecond up to 1 ns directly in the time domain. This experimental
technique is used to excite a polycrystalline nickel (Ni) film optically and
probe the dyn... | 0805.3495v1 |
2008-07-28 | Thermal fluctuations in moderately damped Josephson junctions: Multiple escape and retrapping, switching- and return-current distributions and hysteresis | A crossover at a temperature T* in the temperature dependence of the width s
of the distribution of switching currents of moderately damped Josephson
junctions has been reported in a number of recent publications, with positive
ds/dT and IV characteristics associated with underdamped behaviour for lower
temperatures T<... | 0807.4502v1 |
2009-02-26 | Viscous propagation of mass flow variability in accretion discs | We study mass flow rate through a disc resulting from a varying mass supply
rate. Variable mass supply rate occurs, e.g., during disc state transitions,
and in interacting eccentric binaries. It is, however, damped by the viscosity
of the disc. Here, we calculate this damping in detail. We derive an analytical
descript... | 0902.4530v2 |
2010-04-09 | Oscillations of weakly viscous conducting liquid drops in a strong magnetic field | We analyse small-amplitude oscillations of a weakly viscous electrically
conducting liquid drop in a strong uniform DC magnetic field. An asymptotic
solution is obtained showing that the magnetic field does not affect the shape
eigenmodes, which remain the spherical harmonics as in the non-magnetic case.
Strong magneti... | 1004.1548v2 |
2011-02-03 | Damping of Electron Density Structures and Implications for Interstellar Scintillation | The forms of electron density structures in kinetic Alfven wave turbulence
are studied in connection with scintillation. The focus is on small scales $L
\sim 10^8-10^{10}$ cm where the Kinetic Alfv\'en wave (KAW) regime is active in
the interstellar medium. MHD turbulence converts to a KAW cascade, starting at
10 times... | 1102.0810v2 |
2011-09-28 | Different dimensionality trends in the Landau damping of magnons in iron, cobalt and nickel: time dependent density functional study | We study the Landau damping of ferromagnetic magnons in Fe, Co, and Ni as the
dimensionality of the system is reduced from three to two. We resort to the
\textit{ab initio} linear response time dependent density functional theory in
the adiabatic local spin density approximation. The numerical scheme is based
on the Ko... | 1109.6217v2 |
2011-10-06 | Dissipative and conservative nonlinearity in carbon nanotube and graphene mechanical resonators | Graphene and carbon nanotubes represent the ultimate size limit of one and
two-dimensional nanoelectromechanical resonators. Because of their reduced
dimensionality, graphene and carbon nanotubes display unusual mechanical
behavior; in particular, their dynamics is highly nonlinear. Here, we review
several types of non... | 1110.1234v1 |
2012-06-02 | Slow Mode Oscillations and Damping of Hot Solar Coronal Loops | The effect of temperature inhomogeneity on the periods, their ratios
(fundamental vs. first overtone), and the damping times of the standing slow
modes in gravitationally stratified solar coronal loops are studied. The
effects of optically thin radiation, compressive viscosity, and thermal
conduction are considered. Th... | 1206.0366v1 |
2012-09-15 | Damped kink oscillations of flowing prominence threads | Transverse oscillations of thin threads in solar prominences are frequently
reported in high-resolution observations. Two typical features of the
observations are that the oscillations are damped in time and that simultaneous
mass flows along the threads are detected. Flows cause the dense threads to
move along the pro... | 1209.3382v1 |
2013-04-13 | Parametric survey of longitudinal prominence oscillation simulations | It is found that both microflare-sized impulsive heating at one leg of the
loop and a suddenly imposed velocity perturbation can propel the prominence to
oscillate along the magnetic dip. An extensive parameter survey results in a
scaling law, showing that the period of the oscillation, which weakly depends
on the leng... | 1304.3798v1 |
2013-06-08 | Observation of a Berry phase anti-damping spin-orbit torque | Recent observations of current-induced magnetization switching at
ferromagnet/normal-conductor interfaces have important consequences for future
magnetic memory technology. In one interpretation, the switching originates
from carriers with spin-dependent scattering giving rise to a relativistic
anti-damping spin-orbit ... | 1306.1893v1 |
2013-08-20 | Stringent constraints on the H I spin temperature in two z > 3 Damped Lyman-alpha systems from redshifted 21 cm absorption studies | Physical properties of Damped Lyman-alpha absorbers and their evolution are
closely related to galaxy formation and evolution theories, and have important
cosmological implications. H I 21 cm absorption study is one useful way of
measuring the temperature of these systems. In this work, very strong
constraints on the t... | 1308.4410v1 |
2014-06-16 | Design of the Readout Electronics for the Qualification Model of DAMPE BGO Calorimeter | The DAMPE (DArk Matter Particle Explorer) is a scientific satellite being
developed in China, aimed at cosmic ray study, gamma ray astronomy, and
searching for the clue of dark matter particles, with a planned mission period
of more than 3 years and an orbit altitude of about 500 km. The BGO
Calorimeter, which consists... | 1406.3886v1 |
2014-11-24 | Damping of liquid sloshing by foams | When a container is set in motion, the free surface of the liquid starts to
oscillate or slosh. Such effects can be observed when a glass of water is
handled carelessly and the fluid sloshes or even spills over the rims of the
container. However, beer does not slosh as readily as water, which suggests
that foam could b... | 1411.6542v2 |
2015-04-16 | Attenuation of short strongly nonlinear stress pulses in dissipative granular chains | Attenuation of short, strongly nonlinear stress pulses in chains of spheres
and cylinders was investigated experimentally and numerically for two ratios of
their masses keeping their contacts identical. The chain with mass ratio 0.98
supports solitary waves and another one (with mass ratio 0.55) supports
nonstationary ... | 1504.04344v1 |
2015-04-17 | Chiral damping of magnetic domain walls | Structural symmetry breaking in magnetic materials is responsible for a
variety of outstanding physical phenomena. Examples range from the existence of
multiferroics, to current induced spin orbit torques (SOT) and the formation of
topological magnetic structures. In this letter we bring into light a novel
effect of th... | 1504.04411v1 |
2015-06-18 | The absence of intraband scattering in a consistent theory of Gilbert damping in metallic ferromagnets | Damping of magnetization dynamics in a ferromagnetic metal is usually
characterized by the Gilbert parameter alpha. Recent calculations of this
quantity, using a formula due to Kambersky, find that it is infinite for a
perfect crystal owing to an intraband scattering term which is of third order
in the spin-orbit param... | 1506.05622v2 |
2015-07-28 | Spatial damping of propagating sausage waves in coronal cylinders | Sausage modes are important in coronal seismology. Spatially damped
propagating sausage waves were recently observed in the solar atmosphere. We
examine how wave leakage influences the spatial damping of sausage waves
propagating along coronal structures modeled by a cylindrical density
enhancement embedded in a unifor... | 1507.07724v1 |
2015-10-19 | On the branching of the quasinormal resonances of near-extremal Kerr black holes | It has recently been shown by Yang. et. al. [Phys. Rev. D {\bf 87}, 041502(R)
(2013)] that rotating Kerr black holes are characterized by two distinct sets
of quasinormal resonances. These two families of quasinormal resonances display
qualitatively different asymptotic behaviors in the extremal ($a/M\to 1$)
black-hole... | 1510.05604v1 |
2016-02-16 | Damping and power spectra of quasi-periodic intensity disturbances above a solar polar coronal hole | We study intensity disturbances above a solar polar coronal hole seen in the
AIA 171 \AA\ and 193 \AA\ passbands, aiming to provide more insights into their
physical nature. The damping and power spectra of the intensity disturbances
with frequencies from 0.07 mHz to 10.5 mHz are investigated. The damping of the
intens... | 1602.04883v1 |
2016-05-09 | Storage-ring Electron Cooler for Relativistic Ion Beams | Application of electron cooling at ion energies above a few GeV has been
limited due to reduction of electron cooling efficiency with energy and
difficulty in producing and accelerating a high-current high-quality electron
beam. A high-current storage-ring electron cooler offers a solution to both of
these problems by ... | 1605.02594v1 |
2016-07-06 | Measuring Collisionless Damping in Heliospheric Plasmas using Field-Particle Correlations | An innovative field-particle correlation technique is proposed that uses
single-point measurements of the electromagnetic fields and particle velocity
distribution functions to investigate the net transfer of energy from fields to
particles associated with the collisionless damping of turbulent fluctuations
in weakly c... | 1607.01738v1 |
2016-07-22 | Excitation of nonlinear ion acoustic waves in CH plasmas | Excitation of nonlinear ion acoustic wave (IAW) by an external electric field
is demonstrated by Vlasov simulation. The frequency calculated by the
dispersion relation with no damping is verified much closer to the resonance
frequency of the small-amplitude nonlinear IAW than that calculated by the
linear dispersion re... | 1607.06598v1 |
2016-11-17 | A stable partitioned FSI algorithm for rigid bodies and incompressible flow. Part II: General formulation | A stable partitioned algorithm is developed for fluid-structure interaction
(FSI) problems involving viscous incompressible flow and rigid bodies. This
{\em added-mass partitioned} (AMP) algorithm remains stable, without
sub-iterations, for light and even zero mass rigid bodies when added-mass and
viscous added-damping... | 1611.05703v2 |
2017-03-01 | The Plastic Scintillator Detector at DAMPE | he DArk Matter Particle Explorer (DAMPE) is a general purposed
satellite-borne high energy $\gamma-$ray and cosmic ray detector, and among the
scientific objectives of DAMPE are the searches for the origin of cosmic rays
and an understanding of Dark Matter particles. As one of the four detectors in
DAMPE, the Plastic S... | 1703.00098v1 |
2017-03-22 | Observation of a strong coupling effect on electron-ion collisions in ultracold plasmas | Ultracold plasmas (UCP) provide a well-controlled system for studying
multiple aspects in plasma physics that include collisions and strong coupling
effects. By applying a short electric field pulse to a UCP, a plasma electron
center-of-mass (CM) oscillation can be initiated. In accessible parameter
ranges, the damping... | 1703.07852v2 |
2017-04-18 | Critical pairing fluctuations in the normal state of a superconductor: pseudogap and quasi-particle damping | We study the effect of critical pairing fluctuations on the electronic
properties in the normal state of a clean superconductor in three dimensions.
Using a functional renormalization group approach to take the non-Gaussian
nature of critical fluctuations into account, we show microscopically that in
the BCS regime, wh... | 1704.05282v2 |
2017-05-29 | Probing decoherence in plasmonic waveguides in the quantum regime | We experimentally investigate the decoherence of single surface plasmon
polaritons in metal stripe waveguides. In our study we use a Mach-Zehnder
configuration previously considered for measuring decoherence in atomic,
electronic and photonic systems. By placing waveguides of different length in
one arm we are able to ... | 1705.10344v2 |
2017-07-21 | Spatially Localized Particle Energization by Landau Damping in Current Sheets Produced by Strong Alfven Wave Collisions | Understanding the removal of energy from turbulent fluctuations in a
magnetized plasma and the consequent energization of the constituent plasma
particles is a major goal of heliophysics and astrophysics. Previous work has
shown that nonlinear interactions among counterpropagating Alfven waves---or
Alfven wave collisio... | 1708.00757v1 |
2018-05-26 | Critical collapse of ultra-relativistic fluids: damping or growth of aspherical deformations | We perform fully nonlinear numerical simulations to study aspherical
deformations of the critical self-similar solution in the gravitational
collapse of ultra-relativistic fluids. Adopting a perturbative calculation,
Gundlach predicted that these perturbations behave like damped or growing
oscillations, with the freque... | 1805.10442v1 |
2018-06-19 | Non-linear Relaxation of Interacting Bosons Coherently Driven on a Narrow Optical Transition | We study the dynamics of a two-component Bose-Einstein condensate (BEC) of
$^{174}$Yb atoms coherently driven on a narrow optical transition. The
excitation transfers the BEC to a superposition of states with different
internal and momentum quantum numbers. We observe a crossover with decreasing
driving strength betwee... | 1806.07210v2 |
2018-10-16 | The Solution to the Differential Equation with Linear Damping describing a Physical Systems governed by a Cubic Energy Potential | An analytical solution to the nonlinear differential equation describing the
equation of motion of a particle moving in an unforced physical system with
linear damping, governed by a cubic potential well, is presented in terms of
the Jacobi elliptic functions. In the attractive region of the potential the
system become... | 1810.10336v1 |
2019-01-10 | Damping and softening of transverse acoustic phonons in colossal magnetoresistive La$_{0.7}$Ca$_{0.3}$MnO$_3$ and La$_{0.7}$Sr$_{0.3}$MnO$_3$ | Neutron spectroscopy is used to probe transverse acoustic phonons near the
(2, 2, 0) Bragg position in colossal magnetoresistive La0.7Ca0.3MnO3 and
La0.7Sr0.3MnO3. Upon warming to temperatures near Tc = 257 K the phonon peaks
in La0.7Ca0.3MnO3 soften and damp significantly with the phonon half width at
half maximum app... | 1901.03394v1 |
2019-03-13 | Inference of magnetic field strength and density from damped transverse coronal waves | A classic application of coronal seismology uses transverse oscillations of
waveguides to obtain estimates of the magnetic field strength. The procedure
requires information on the density of the structures. Often, it ignores the
damping of the oscillations. We computed marginal posteriors for parameters
such as the wa... | 1903.05437v1 |
2019-03-14 | A metal-poor damped Ly-alpha system at redshift 6.4 | We identify a strong Ly-alpha damping wing profile in the spectrum of the
quasar P183+05 at z=6.4386. Given the detection of several narrow metal
absorption lines at z=6.40392, the most likely explanation for the absorption
profile is that it is due to a damped Ly-alpha system. However, in order to
match the data a con... | 1903.06186v2 |
2019-04-30 | DmpIRFs and DmpST: DAMPE Instrument Response Functions and Science Tools for Gamma-Ray Data Analysis | GeV gamma ray is an important observation target of DArk Matter Particle
Explorer (DAMPE) for indirect dark matter searching and high energy
astrophysics. We present in this work a set of accurate instrument response
functions of DAMPE (DmpIRFs) including the effective area, point-spread
function and energy dispersion ... | 1904.13098v1 |
2019-05-14 | Fractional damping through restricted calculus of variations | We deliver a novel approach towards the variational description of Lagrangian
mechanical systems subject to fractional damping by establishing a restricted
Hamilton's principle. Fractional damping is a particular instance of non-local
(in time) damping, which is ubiquitous in mechanical engineering applications.
The re... | 1905.05608v1 |
2019-05-22 | Ultra-low magnetic damping in Co 2 Mn-based Heusler compounds: promising materials for spintronic | The prediction of ultra-low magnetic damping in Co 2 MnZ Heusler half-metal
thin-film magnets is explored in this study and the damping response is shown
to be linked to the underlying electronic properties. By substituting the Z
elements in high crystalline quality films (Co 2 MnZ with Z=Si, Ge, Sn, Al, Ga,
Sb), elect... | 1905.08987v1 |
2019-07-16 | Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona | Rapidly decaying slow magnetoacoustic waves are regularly observed in the
solar coronal structures, offering a promising tool for a seismological
diagnostics of the coronal plasma, including its thermodynamical properties.
The effect of damping of standing slow magnetoacoustic oscillations in the
solar coronal loops is... | 1907.07051v1 |
2019-07-29 | Breather arrest in a chain of damped oscillators with Hertzian contact | We explore breather propagation in the damped oscillatory chain with
essentially nonlinear (non-linearizable) nearest-neighbour coupling.
Combination of the damping and the substantially nonlinear coupling leads to
rather unusual two-stage pattern of the breather propagation. The first stage
occurs at finite fragment o... | 1907.12462v1 |
2019-08-22 | Influence of structure and cation distribution on magnetic anisotropy and damping in Zn/Al doped nickel ferrites | An in-depth analysis of Zn/Al doped nickel ferrites grown by reactive
magnetron sputtering is relevant due to their promising characteristics for
applications in spintronics. The material is insulating and ferromagnetic at
room temperature with an additional low magnetic damping. By studying the
complex interplay betwe... | 1908.08257v3 |
2019-09-11 | Critical corrections to formulations of nonlinear energy dissipation of ultrasonically excited bubbles and a unifying parameter to asses and enhance bubble activity in applications | Nonlinear oscillations of bubbles can significantly increase the attenuation
of the host media. Optimization of bubble related applications needs a
realistic estimation of the medium attenuation and bubble activity. A correct
estimation of the wave attenuation in bubbly media requires an accurate
estimation of the powe... | 1909.04864v1 |
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