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Journal articles on the topic 'Timescale separation system dynamics'

Author: Grafiati

Published: 6 September 2023

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1

Williamson, Mark S., Sebastian Bathiany, and Timothy M. Lenton. "Early warning signals of tipping points in periodically forced systems." Earth System Dynamics 7, no. 2 (2016): 313–26. http://dx.doi.org/10.5194/esd-7-313-2016.

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Abstract. The prospect of finding generic early warning signals of an approaching tipping point in a complex system has generated much interest recently. Existing methods are predicated on a separation of timescales between the system studied and its forcing. However, many systems, including several candidate tipping elements in the climate system, are forced periodically at a timescale comparable to their internal dynamics. Here we use alternative early warning signals of tipping points due to local bifurcations in systems subjected to periodic forcing whose timescale is similar to the period

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Wu, Weijun, Andrew E. Sifain, Courtney A. Delpo, and Gregory D. Scholes. "Polariton enhanced free charge carrier generation in donor–acceptor cavity systems by a second-hybridization mechanism." Journal of Chemical Physics 157, no. 16 (2022): 161102. http://dx.doi.org/10.1063/5.0122497.

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Cavity quantum electrodynamics has been studied as a potential approach to modify free charge carrier generation in donor–acceptor heterojunctions because of the delocalization and controllable energy level properties of hybridized light–matter states known as polaritons. However, in many experimental systems, cavity coupling decreases charge separation. Here, we theoretically study the quantum dynamics of a coherent and dissipative donor–acceptor cavity system, to investigate the dynamical mechanism and further discover the conditions under which polaritons may enhance free charge carrier gen

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Webber, S., and M. R. Jeffrey. "Loss of Determinacy at Small Scales, with Application to Multiple Timescale and Nonsmooth Dynamics." International Journal of Bifurcation and Chaos 31, no. 03 (2021): 2150041. http://dx.doi.org/10.1142/s0218127421500413.

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A singularity is described that creates a forward time loss of determinacy in a two-timescale system, in the limit where the timescale separation is large. We describe how the situation can arise in a dynamical system of two fast variables and three slow variables or parameters, with weakly coupling between the fast variables. A wide set of initial conditions enters the [Formula: see text]-neighborhood of the singularity, and explodes back out of it to fill a large region of phase space, all in finite time. The scenario has particular significance in the application to piecewise-smooth systems

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Costa, Antonio C., Tosif Ahamed, David Jordan, and Greg J. Stephens. "Maximally predictive states: From partial observations to long timescales." Chaos: An Interdisciplinary Journal of Nonlinear Science 33, no. 2 (2023): 023136. http://dx.doi.org/10.1063/5.0129398.

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Isolating slower dynamics from fast fluctuations has proven remarkably powerful, but how do we proceed from partial observations of dynamical systems for which we lack underlying equations? Here, we construct maximally predictive states by concatenating measurements in time, partitioning the resulting sequences using maximum entropy, and choosing the sequence length to maximize short-time predictive information. Transitions between these states yield a simple approximation of the transfer operator, which we use to reveal timescale separation and long-lived collective modes through the operator

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Williamson, M. S., S. Bathiany, and T. M. Lenton. "Early warning signals of tipping points in periodically forced systems." Earth System Dynamics Discussions 6, no. 2 (2015): 2243–72. http://dx.doi.org/10.5194/esdd-6-2243-2015.

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Abstract. The prospect of finding generic early warning signals of an approaching tipping point in a complex system has generated much recent interest. Existing methods are predicated on a separation of timescales between the system studied and its forcing. However, many systems, including several candidate tipping elements in the climate system, are forced periodically at a timescale comparable to their internal dynamics. Here we find alternative early warning signals of tipping points due to local bifurcations in systems subjected to periodic forcing whose time scale is similar to the period

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Ha, Sang Wook, and Bong Seok Park. "Disturbance Observer-Based Control for Trajectory Tracking of a Quadrotor." Electronics 9, no. 10 (2020): 1624. http://dx.doi.org/10.3390/electronics9101624.

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This paper presents a new control approach for the trajectory tracking of a quadrotor in the presence of external disturbances. Unlike in previous studies using hierarchical control strategies, a nonlinear controller is designed by introducing new state transformations that can use Euler angles as virtual control inputs. Thus, the proposed method can eliminate the timescale separation assumption of hierarchical control strategies. To estimate the external disturbances involved in the translational and rotational dynamics of the quadrotor, disturbance observers are developed. Using state transf

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Benavides, Santiago J., Keaton J. Burns, Basile Gallet, and Glenn R. Flierl. "Effective Drag in Rotating, Poorly Conducting Plasma Turbulence." Astrophysical Journal 938, no. 2 (2022): 92. http://dx.doi.org/10.3847/1538-4357/ac9137.

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Abstract Despite the increasing sophistication of numerical models of hot Jupiter atmospheres, the large timescale separation required in simulating the wide range in electrical conductivity between the dayside and nightside has made it difficult to run fully consistent magnetohydrodynamic (MHD) models. This has led to many studies that resort to drag parameterizations of MHD. In this study, we revisit the question of the Lorentz force as an effective drag by running a series of direct numerical simulations of a weakly rotating, poorly conducting flow in the presence of a misaligned, strong ba

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Lee, Ka Kit, Darren Yi Sern Low, Mei Ling Foo, et al. "Molecular Dynamics Simulation of Nanocellulose-Stabilized Pickering Emulsions." Polymers 13, no. 4 (2021): 668. http://dx.doi.org/10.3390/polym13040668.

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While the economy is rapidly expanding in most emerging countries, issues coupled with a higher population has created foreseeable tension among food, water, and energy. It is crucial for more sustainable valorization of resources, for instance, nanocellulose, to address the core challenges in environmental sustainability. As the complexity of the system evolved, the timescale of project development has increased exponentially. However, research on the design and operation of integrated nanomaterials, along with energy supply, monitoring, and control infrastructure, has seriously lagged. The d

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Wouters, Jeroen, Stamen Iankov Dolaptchiev, Valerio Lucarini, and Ulrich Achatz. "Parameterization of stochastic multiscale triads." Nonlinear Processes in Geophysics 23, no. 6 (2016): 435–45. http://dx.doi.org/10.5194/npg-23-435-2016.

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Abstract. We discuss applications of a recently developed method for model reduction based on linear response theory of weakly coupled dynamical systems. We apply the weak coupling method to simple stochastic differential equations with slow and fast degrees of freedom. The weak coupling model reduction method results in general in a non-Markovian system; we therefore discuss the Markovianization of the system to allow for straightforward numerical integration. We compare the applied method to the equations obtained through homogenization in the limit of large timescale separation between slow

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Paddon-Row, Michael N. "Superexchange-Mediated Charge Separation and Charge Recombination in Covalently Linked Donor - Bridge - Acceptor Systems." Australian Journal of Chemistry 56, no. 8 (2003): 729. http://dx.doi.org/10.1071/ch02249.

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Evidence is presented in support of the concept that electron transfer (ET) between a pair of chromophores may take place efficiently over large distances (>10 Å) by the mediation of an intervening saturated hydrocarbon medium. For example, ET is found to take place on a sub-nanosecond timescale through saturated norbornylogous bridges greater than 13 Å in length, by a superexchange (through-bond coupling) mechanism. The dependence of the ET dynamics on the bridge length and configuration are consistent with the operation of a superexchange mechanism. The distinction between molecular wire

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Gessner, Oliver. "(Invited) Discovering Bottlenecks and Opportunities in Hybrid Solar Light Harvesting Systems By Ultrafast X-Ray Spectroscopy." ECS Meeting Abstracts MA2022-01, no. 36 (2022): 1580. http://dx.doi.org/10.1149/ma2022-01361580mtgabs.

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A prerequisite for advancing hybrid solar light harvesting systems is a comprehensive understanding of photoinduced electronic dynamics across a wide range of spatial and temporal scales. Time-resolved spectroscopy techniques in the optical domain have proven instrumental in identifying critical timescales of fundamental processes, such as interfacial charge transfer, charge migration, and carrier lifetimes, which are intimately linked to a system's performance. New light source and instrument developments open opportunities to extend such studies into the X-ray regime. Due to their inherent e

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Kranjec, Andrej, Petr Karpov, Yevhenii Vaskivskyi, Jaka Vodeb, Yaroslav Gerasimenko, and Dragan Mihailovic. "Electronic Dislocation Dynamics in Metastable Wigner Crystal States." Symmetry 14, no. 5 (2022): 926. http://dx.doi.org/10.3390/sym14050926.

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Metastable states appear in many areas of physics as a result of symmetry-breaking phase transitions. An important challenge is to understand the microscopic mechanisms which lead to the formation of the energy barrier separating a metastable state from the ground state. In this paper, we describe an experimental example of the hidden metastable domain state in 1T-TaS2, created by photoexcitation or carrier injection. The system is an example of a charge density wave superlattice in the Wigner crystal limit displaying discommensurations and domain formation when additional charge is injected e

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Sanchez-Laulhe, Ernesto, Ramon Fernandez-Feria, and Anibal Ollero. "Simplified Model for Forward-Flight Transitions of a Bio-Inspired Unmanned Aerial Vehicle." Aerospace 9, no. 10 (2022): 617. http://dx.doi.org/10.3390/aerospace9100617.

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A new forward-flight model for bird-like ornithopters is presented. The flight dynamics model uses results from potential, unsteady aerodynamics to characterize the forces generated by the flapping wings, including the effects of the dynamic variables on the aerodynamic formulation. Numerical results of the model, which are validated with flapping flight experimental data of an ornithopter prototype, show that state variables such as the pitch angle and the angle of attack oscillate with the flapping frequency, while their mean values converge towards steady-state values. The theoretical analy

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van Elteren, A., S. Portegies Zwart, I. Pelupessy, M. X. Cai, and S. L. W. McMillan. "Survivability of planetary systems in young and dense star clusters." Astronomy & Astrophysics 624 (April 2019): A120. http://dx.doi.org/10.1051/0004-6361/201834641.

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Aims. We perform a simulation using the Astrophysical Multipurpose Software Environment of the Orion Trapezium star cluster in which the evolution of the stars and the dynamics of planetary systems are taken into account. Methods. The initial conditions from earlier simulations were selected in which the size and mass distributions of the observed circumstellar disks in this cluster are satisfactorily reproduced. Four, five, or size planets per star were introduced in orbit around the 500 solar-like stars with a maximum orbital separation of 400 au. Results. Our study focuses on the production

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Mukherjee, Siddhartha, Arman Safdari, Orest Shardt, Saša Kenjereš, and Harry E. A. Van den Akker. "Droplet–turbulence interactions and quasi-equilibrium dynamics in turbulent emulsions." Journal of Fluid Mechanics 878 (September 6, 2019): 221–76. http://dx.doi.org/10.1017/jfm.2019.654.

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We perform direct numerical simulations (DNS) of emulsions in homogeneous isotropic turbulence using a pseudopotential lattice-Boltzmann (PP-LB) method. Improving on previous literature by minimizing droplet dissolution and spurious currents, we show that the PP-LB technique is capable of long stable simulations in certain parameter regions. Varying the dispersed-phase volume fraction $\unicode[STIX]{x1D719}$, we demonstrate that droplet breakup extracts kinetic energy from the larger scales while injecting energy into the smaller scales, increasingly with higher $\unicode[STIX]{x1D719}$, with

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Tjiputra, Jerry F., Jörg Schwinger, Mats Bentsen, et al. "Ocean biogeochemistry in the Norwegian Earth System Model version 2 (NorESM2)." Geoscientific Model Development 13, no. 5 (2020): 2393–431. http://dx.doi.org/10.5194/gmd-13-2393-2020.

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Abstract. The ocean carbon cycle is a key player in the climate system through its role in regulating the atmospheric carbon dioxide concentration and other processes that alter the Earth's radiative balance. In the second version of the Norwegian Earth System Model (NorESM2), the oceanic carbon cycle component has gone through numerous updates that include, amongst others, improved process representations, increased interactions with the atmosphere, and additional new tracers. Oceanic dimethyl sulfide (DMS) is now prognostically simulated and its fluxes are directly coupled with the atmospher

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Adalsteinsson, Helgi, Bert J. Debusschere, Kevin R. Long, and Habib N. Najm. "Components for Atomistic-to-Continuum Multiscale Modeling of Flow in Micro- and Nanofluidic Systems." Scientific Programming 16, no. 4 (2008): 297–313. http://dx.doi.org/10.1155/2008/738576.

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Micro- and nanofluidics pose a series of significant challenges for science-based modeling. Key among those are the wide separation of length- and timescales between interface phenomena and bulk flow and the spatially heterogeneous solution properties near solid-liquid interfaces. It is not uncommon for characteristic scales in these systems to span nine orders of magnitude from the atomic motions in particle dynamics up to evolution of mass transport at the macroscale level, making explicit particle models intractable for all but the simplest systems. Recently, atomistic-to-continuum (A2C) mu

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Seckler, Marcelo Martins. "Crystallization in Fluidized Bed Reactors: From Fundamental Knowledge to Full-Scale Applications." Crystals 12, no. 11 (2022): 1541. http://dx.doi.org/10.3390/cryst12111541.

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A review is presented on fifty years of research on crystallization in fluidized bed reactors (FBRs). FBRs are suitable for recovery of slightly soluble compounds from aqueous solutions, as it yields large, millimeter sized particles, which are suitable for reuse and permits low liquid residence times in the timescale of minutes. Full-scale applications for water softening have been applied since the 1980s, and since then, new applications have been developed or are in development for recovery of phosphorus, magnesium, fluoride, metals, sulfate, and boron. Process integration with membrane, ad

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Rominger, Andrew J., Miguel A. Fuentes, and Pablo A. Marquet. "Nonequilibrium evolution of volatility in origination and extinction explains fat-tailed fluctuations in Phanerozoic biodiversity." Science Advances 5, no. 6 (2019): eaat0122. http://dx.doi.org/10.1126/sciadv.aat0122.

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Fluctuations in biodiversity, large and small, pervade the fossil record, yet we do not understand the processes generating them. Here, we extend theory from nonequilibrium statistical physics to describe the fat-tailed form of fluctuations in Phanerozoic marine invertebrate richness. Using this theory, known as superstatistics, we show that heterogeneous rates of origination and extinction between clades and conserved rates within clades account for this fat-tailed form. We identify orders and families as the taxonomic levels at which clades experience interclade heterogeneity and within-clad

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Petit, Antoine C., Gabriele Pichierri, Melvyn B. Davies, and Anders Johansen. "The path to instability in compact multi-planetary systems." Astronomy & Astrophysics 641 (September 2020): A176. http://dx.doi.org/10.1051/0004-6361/202038764.

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The dynamical stability of tightly packed exoplanetary systems remains poorly understood. While a sharp stability boundary exists for a two-planet system, numerical simulations of three-planet systems and higher show that they can experience instability on timescales up to billions of years. Moreover, an exponential trend between the planet orbital separation measured in units of Hill radii and the survival time has been reported. While these findings have been observed in numerous numerical simulations, little is known of the actual mechanism leading to instability. Contrary to a constant dif

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Sahoo, Debgopal, Guruprasad Samanta, and Manuel De la Sen. "Impact of Fear and Habitat Complexity in a Predator-Prey System with Two Different Shaped Functional Responses: A Comparative Study." Discrete Dynamics in Nature and Society 2021 (September 10, 2021): 1–22. http://dx.doi.org/10.1155/2021/6427864.

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Habitat complexity or the structural complexity of habitat reduces the available space for interacting species, and subsequently, the encounter rate between the prey and predator is decreased significantly. Different experimental shreds of evidence validate that the presence of the predator strongly affects the physiological behaviour of prey individuals and dramatically reduces their reproduction rate. In this study, we investigate the interplay between the level of fear and the degree of habitat complexity in a predator-prey model with two different shaped functional responses. We, therefore

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Hofer, Matthias, Jasan Zughaibi, and Raffaello D’Andrea. "Design and Control of an Inflatable Spherical Robotic Arm for Pick and Place Applications." Actuators 10, no. 11 (2021): 299. http://dx.doi.org/10.3390/act10110299.

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We present an inflatable soft robotic arm made of fabric that leverages state-of-the-art manufacturing techniques, leading to a robust and reliable manipulator. Three bellow-type actuators are used to control two rotational degrees of freedom, as well as the joint stiffness that is coupled to a longitudinal elongation of the movable link used to grasp objects. The design is motivated by a safety analysis based on first principles. It shows that the interaction forces during an unexpected collision are primarily caused by the attached payload mass, but can be reduced by a lightweight design of

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Boccaletti, A., E. Sezestre, A. M. Lagrange, et al. "Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries." Astronomy & Astrophysics 614 (June 2018): A52. http://dx.doi.org/10.1051/0004-6361/201732462.

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Context. The nearby and young M star AU Mic is surrounded by a debris disk in which we previously identified a series of large-scale arch-like structures that have never been seen before in any other debris disk and that move outward at high velocities. Aims. We initiated a monitoring program with the following objectives: (1) track the location of the structures and better constrain their projected speeds, (2) search for new features emerging closer in, and ultimately (3) understand the mechanism responsible for the motion and production of the disk features. Methods. AU Mic was observed at 1

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Quinn, Courtney, Terence J. O'Kane, and Vassili Kitsios. "Application of a local attractor dimension to reduced space strongly coupled data assimilation for chaotic multiscale systems." Nonlinear Processes in Geophysics 27, no. 1 (2020): 51–74. http://dx.doi.org/10.5194/npg-27-51-2020.

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Abstract. The basis and challenge of strongly coupled data assimilation (CDA) is the accurate representation of cross-domain covariances between various coupled subsystems with disparate spatio-temporal scales, where often one or more subsystems are unobserved. In this study, we explore strong CDA using ensemble Kalman filtering methods applied to a conceptual multiscale chaotic model consisting of three coupled Lorenz attractors. We introduce the use of the local attractor dimension (i.e. the Kaplan–Yorke dimension, dimKY) to prescribe the rank of the background covariance matrix which we con

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Micheel, Mathias, Bei Liu, and Maria Wächtler. "Influence of Surface Ligands on Charge-Carrier Trapping and Relaxation in Water-Soluble CdSe@CdS Nanorods." Catalysts 10, no. 10 (2020): 1143. http://dx.doi.org/10.3390/catal10101143.

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In this study, the impact of the type of ligand at the surface of colloidal CdSe@CdS dot-in-rod nanostructures on the basic exciton relaxation and charge localization processes is closely examined. These systems have been introduced into the field of artificial photosynthesis as potent photosensitizers in assemblies for light driven hydrogen generation. Following photoinduced exciton generation, electrons can be transferred to catalytic reaction centers while holes localize into the CdSe seed, which can prevent charge recombination and lead to the formation of long-lived charge separation in a

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El Mellah, I., J. Bolte, L. Decin, W. Homan, and R. Keppens. "Wind morphology around cool evolved stars in binaries." Astronomy & Astrophysics 637 (May 2020): A91. http://dx.doi.org/10.1051/0004-6361/202037492.

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Context. The late evolutionary phase of low- and intermediate-mass stars is strongly constrained by their mass-loss rate, which is orders of magnitude higher than during the main sequence. The wind surrounding these cool expanded stars frequently shows nonspherical symmetry, which is thought to be due to an unseen companion orbiting the donor star. The imprints left in the outflow carry information about the companion and also the launching mechanism of these dust-driven winds. Aims. We study the morphology of the circumbinary envelope and identify the conditions of formation of a wind-capture

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Petrie, Ruth Elizabeth, Ross Noel Bannister, and Michael John Priestley Cullen. "The ABC model: a non-hydrostatic toy model for use in convective-scale data assimilation investigations." Geoscientific Model Development 10, no. 12 (2017): 4419–41. http://dx.doi.org/10.5194/gmd-10-4419-2017.

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Abstract. In developing methods for convective-scale data assimilation (DA), it is necessary to consider the full range of motions governed by the compressible Navier–Stokes equations (including non-hydrostatic and ageostrophic flow). These equations describe motion on a wide range of timescales with non-linear coupling. For the purpose of developing new DA techniques that suit the convective-scale problem, it is helpful to use so-called toy models that are easy to run and contain the same types of motion as the full equation set. Such a model needs to permit hydrostatic and geostrophic balanc

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Zoppetti, F. A., C. Beaugé, A. M. Leiva, and H. Folonier. "A self-consistent weak friction model for the tidal evolution of circumbinary planets." Astronomy & Astrophysics 627 (July 2019): A109. http://dx.doi.org/10.1051/0004-6361/201935849.

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We present a self-consistent model for the tidal evolution of circumbinary planets that is easily extensible to any other three-body problem. Based on the weak-friction model, we derive expressions of the resulting forces and torques considering complete tidal interactions between all the bodies of the system. Although the tidal deformation suffered by each extended mass must take into account the combined gravitational effects of the other two bodies, the only tidal forces that have a net effect on the dynamic are those that are applied on the same body that exerts the deformation, as long as

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FREZZATO, DIEGO, GIACOMO SAIELLI, ANTONINO POLIMENO, and PIER LUIGI NORDIO. "A STOCHASTIC CAGE MODEL FOR THE ORIENTATIONAL DYNAMICS OF SINGLE MOLECULES IN NEMATIC PHASES." International Journal of Modern Physics C 10, no. 02n03 (1999): 375–89. http://dx.doi.org/10.1142/s0129183199000280.

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A stochastic cage model for the orientational dynamics of a molecule in isotropic and nematic phases of a liquid crystal has been developed, following the methodology introduced in Refs. 1, 2. The model has been parameterized on the basis of statistical data obtained from the analysis of Molecular Dynamics (MD) simulations of a Gay–Berne mesogen and is based on the general assumption of a timescale separation between the fast inertial librational motion inside the instantaneous cage potential and the slow diffusive motion of the cage itself. The model is able to reproduce single molecule time

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Lbadaoui-Darvas, Mária, Satoshi Takahama, and Athanasios Nenes. "Molecular-scale description of interfacial mass transfer in phase-separated aqueous secondary organic aerosol." Atmospheric Chemistry and Physics 21, no. 23 (2021): 17687–714. http://dx.doi.org/10.5194/acp-21-17687-2021.

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Abstract. Liquid–liquid phase-separated (LLPS) aerosol particles are known to exhibit increased cloud condensation nuclei (CCN) activity compared to well-mixed ones due to a complex effect of low surface tension and non-ideal mixing. The relation between the two contributions as well as the molecular-scale mechanism of water uptake in the presence of an internal interface within the particle is to date not fully understood. Here we attempt to gain understanding in these aspects through steered molecular dynamics simulation studies of water uptake by a vapor–hydroxy-cis-pinonic acid–water doubl

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Selim, Shababa, Laia Francàs, Miguel García-Tecedor, et al. "WO3/BiVO4: impact of charge separation at the timescale of water oxidation." Chemical Science 10, no. 9 (2019): 2643–52. http://dx.doi.org/10.1039/c8sc04679d.

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Jeyakumar, D., and B. Nageswara Rao. "Dynamics of satellite separation system." Journal of Sound and Vibration 297, no. 1-2 (2006): 444–55. http://dx.doi.org/10.1016/j.jsv.2006.03.035.

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Klenov, Nikolay V., Alexey V. Kuznetsov, Igor I. Soloviev, Sergey V. Bakurskiy, and Olga V. Tikhonova. "Magnetic reversal dynamics of a quantum system on a picosecond timescale." Beilstein Journal of Nanotechnology 6 (September 28, 2015): 1946–56. http://dx.doi.org/10.3762/bjnano.6.199.

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We present our approach for a consistent, fully quantum mechanical description of the magnetization reversal process in natural and artificial atomic systems by means of short magnetic pulses. In terms of the simplest model of a two-level system with a magnetic moment, we analyze the possibility of a fast magnetization reversal on the picosecond timescale induced by oscillating or short unipolar magnetic pulses. We demonstrate the possibility of selective magnetization reversal of a superconducting flux qubit using a single flux quantum-based pulse and suggest a promising, rapid Λ-scheme for r

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Appignanesi, G. A., J. A. Rodriguez Fris, L. M. Alarcón, M. A. Frechero, and R. A. Montani. "Relaxation dynamics of simple glass-formers: The role of timescale separation and activated dynamics at the metabasin level." physica status solidi (c) 2, no. 10 (2005): 3532–35. http://dx.doi.org/10.1002/pssc.200461743.

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Appignanesi, G. A., L. M. Alarcón, J. A. Rodríguez Fris, M. A. Frechero, and R. A. Montani. "Activated dynamics and timescale separation within the landscape paradigm: signature of complexity, diversity and glassiness." Biophysical Chemistry 115, no. 2-3 (2005): 129–34. http://dx.doi.org/10.1016/j.bpc.2004.12.017.

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Rantala, Antti, Pauli Pihajoki, and Peter H. Johansson. "KETJU: Post-Newtonian-Accurate Supermassive Black Hole Dynamics in GADGET-3." Proceedings of the International Astronomical Union 12, S324 (2016): 342–46. http://dx.doi.org/10.1017/s1743921316013004.

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AbstractWe present KETJU, a new regularized tree code based on algorithmic chain regularization and implemented into Gadget-3. This new code is able to follow simultaneously galactic-scale dynamical and astrophysical processes and the small-scale supermassive black hole binary dynamics. We present here the general idea of this new code and show a test simulation of black hole binary dynamics in a galaxy merger of two massive elliptical galaxies. The separation of the black holes at the time of the merger is several orders of magnitude smaller in KETJU than when compared to ordinary Gadget-3 si

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Sumitani, Shinji, Mio Kobayashi, and Kohtaro Yamada. "Phase-Separation Dynamics in a Multicomponent System." Journal of Signal Processing 19, no. 4 (2015): 103–6. http://dx.doi.org/10.2299/jsp.19.103.

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González, Gilberto A., Noe G. Barrera, Gerardo Ayala, J. Aaron Padilla, and David Z. Alvarado. "Quasi-Steady-State Models of Three Timescale Systems: A Bond Graph Approach." Mathematical Problems in Engineering 2019 (October 20, 2019): 1–20. http://dx.doi.org/10.1155/2019/9783740.

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Modelling in bond graph to obtain reduced models of systems with singular perturbations is applied. This singularly perturbed system is characterized by having three timescales, i.e., slow, medium, and fast dynamics. From a bond graph whose storage elements have an integral causality assignment (BGI), the mathematical model of the complete system can be determined. By assigning a derivative causality assignment to the storage elements for the fast dynamics and maintaining an integral causality assignment for the slow and medium dynamics on the bond graph, reduced models for the slow and medium

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Yan, Yaming, Linze Song, and Qiang Shi. "Understanding the free energy barrier and multiple timescale dynamics of charge separation in organic photovoltaic cells." Journal of Chemical Physics 148, no. 8 (2018): 084109. http://dx.doi.org/10.1063/1.5017866.

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Zhang, Weiya, Yongli Li, Xiaoyong Chang, and Nan Wang. "Singular Perturbation Theory-Based Qualitative Dynamics Investigation of Flywheel Energy Storage System in Discharge Mode." Journal of Applied Mathematics 2014 (2014): 1–17. http://dx.doi.org/10.1155/2014/487596.

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An investigation on qualitative dynamics in a voltage-current dual-loop controlled flywheel energy storage system (FESS) operating in discharge mode is presented in this paper, providing novel insights into the effect of two-timescale characteristics on the safety and stability of energy transmission of FESS. Based on singular perturbation theory, a two-timescale approach is proposed to separate the FESS into the fast and slow subsystems. Stability analysis of the transient fixed points confirms the effects of systemic parameters on FESS’s dynamics and indicates that the FESS shifts from the s

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DeDeo, Simon, David Krakauer, and Jessica Flack. "Evidence of strategic periodicities in collective conflict dynamics." Journal of The Royal Society Interface 8, no. 62 (2011): 1260–73. http://dx.doi.org/10.1098/rsif.2010.0687.

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We analyse the timescales of conflict decision-making in a primate society. We present evidence for multiple, periodic timescales associated with social decision-making and behavioural patterns. We demonstrate the existence of periodicities that are not directly coupled to environmental cycles or known ultraridian mechanisms. Among specific biological and socially defined demographic classes, periodicities span timescales between hours and days. Our results indicate that these periodicities are not driven by exogenous or internal regularities but are instead driven by strategic responses to so

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Xu, Yiming, Xiao Wang, Li Wang, Kai Wang, and Lei Ma. "Learning Control for Flexible Manipulators with Varying Loads: A Composite Method with Robust Adaptive Dynamic Programming and Robust Sliding Mode Control." Electronics 11, no. 6 (2022): 956. http://dx.doi.org/10.3390/electronics11060956.

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This paper focuses on the learning-based motion control for flexible manipulators with varying loads via the singularly perturbed technique. Considering the two-timescale feature of the flexible manipulator, system dynamics are decomposed into fast and slow subsystems, and corresponding sub-controllers are designed with robust adaptive dynamic programming (RADP) and robust sliding mode control (RSMC) methods, respectively. In the proposed composite control framework, an RADP-based sub-controller is developed to realize the trajectory tracking and alleviate the parametric uncertainty utilizing

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Davis, Nicholas A., Patrick Callaghan, Isla R. Simpson, and Simone Tilmes. "Specified dynamics scheme impacts on wave-mean flow dynamics, convection, and tracer transport in CESM2 (WACCM6)." Atmospheric Chemistry and Physics 22, no. 1 (2022): 197–214. http://dx.doi.org/10.5194/acp-22-197-2022.

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Abstract. Specified dynamics schemes are ubiquitous modeling tools for isolating the roles of dynamics and transport on chemical weather and climate. They typically constrain the circulation of a chemistry–climate model to the circulation in a reanalysis product through linear relaxation. However, recent studies suggest that these schemes create a divergence in chemical climate and the meridional circulation between models and do not accurately reproduce trends in the circulation. In this study we perform a systematic assessment of the specified dynamics scheme in the Community Earth System Mo

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Dotti, Massimo, Monica Colpi, Francesco Haardt, and Lucio Mayer. "Simulating the dynamics of binary black holes in nuclear gaseous discs." Proceedings of the International Astronomical Union 3, S245 (2007): 241–42. http://dx.doi.org/10.1017/s1743921308017778.

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AbstractWe study the pairing of massive black holes embedded in a massive circum–nuclear, rotationally supported disc, until they form a close binary. Using high resolution SPH simulations, we follow the black hole dynamics, and in particular the eccentricity evolution, as a function of the composition in stars and gas of the disc. Binary–disc interaction always leads to orbital decay and, in case of co–rotating black holes, to orbit circularization. We present also a higher resolution simulation performed using the particle–splitting technique showing that the binary orbital decay is efficien

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Oono, Y., S. Puri, C. Yeung, and M. Bahiana. "Cell dynamical system study of phase separation dynamics." Journal of Applied Crystallography 21, no. 6 (1988): 883–85. http://dx.doi.org/10.1107/s0021889888002079.

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Voss, Jonathan M., Pavel K. Olshin, Marcel Drabbels, and Ulrich J. Lorenz. "Visualizing Nanoscale Dynamics with Time-resolved Electron Microscopy." CHIMIA 76, no. 9 (2022): 754. http://dx.doi.org/10.2533/chimia.2022.754.

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The large number of interactions in nanoscale systems leads to the emergence of complex behavior. Understanding such complexity requires atomic-resolution observations with a time resolution that is high enough to match the characteristic timescale of the system. Our laboratory’s method of choice is time-resolved electron microscopy. In particular, we are interested in the development of novel methods and instrumentation for high-speed observations with atomic resolution. Here, we present an overview of the activities in our laboratory.

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Ge, Chenchen, Muyang Liu, and Junru Chen. "Modeling of Direct-Drive Permanent Magnet Synchronous Wind Power Generation System Considering the Power System Analysis in Multi-Timescales." Energies 15, no. 20 (2022): 7471. http://dx.doi.org/10.3390/en15207471.

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The dynamics of wind power generation cannot be neglected in the modern power system and could have a great impact on the system dynamics, even raising the risk of a blackout. Because of this, power system simulation has to include the model of wind power generation. However, due to the high order of the full model of the wind power generator, it is impossible to model them in detail in the use of the power system dynamic simulation considering the thousands of wind generators in the grid. In this context, a simplified model is normally used with the trade-off in lower accuracy. As a direct-dr

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Érdi, B. "On the dynamics of Trojan asteroids." Symposium - International Astronomical Union 172 (1996): 171–76. http://dx.doi.org/10.1017/s0074180900127305.

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The author's theory of Trojan asteroids (Érdi, 1988) is developed further. The motion of the Trojans is considered in the framework of the three-dimensional elliptic restricted three-body problem of the Sun-Jupiter-asteroid system including also the secular changes of Jupiter's orbital eccentricity and the apsidal motion of Jupiter's elliptic orbit. An asymptotic solution is derived, by applying the multiple-timescale method, for the cylindrical coordinates of the asteriods and for the perturbations of the orbital elements. This solution is used for the analysis of the long-time dynamical beha

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Leckron, Kai, Alexander Baral, and Hans Christian Schneider. "Exchange scattering on ultrafast timescales in a ferromagnetic two-sublattice system." Applied Physics Letters 120, no. 10 (2022): 102407. http://dx.doi.org/10.1063/5.0080379.

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We investigate ultrafast spin dynamics due to exchange, electron–phonon and Elliott–Yafet spin-flip scattering in a model with a simple band structure and ferromagnetically coupled electronic sublattices (or more generally, subsystems). We show that this incoherent model of electronic dynamics leads to sublattice magnetization changes in opposite directions after ultrashort-pulse excitation. This prominent feature on an ultrafast timescale is related to a transfer of energy and angular momentum between the subsystems due to exchange scattering. Our calculations illustrate a possible incoherent

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Bashmmakh, Bandar J., Xiaoyu Wang, Cynthia J. Jameson, and Sohail Murad. "Understanding Separation Mechanisms of Monoatomic Gases, Such as Kr and Xe, via DD3R Zeolite Membrane Using Molecular Dynamics." Thermo 2, no. 1 (2022): 56–73. http://dx.doi.org/10.3390/thermo2010005.

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Noble gas fission byproducts, such as Kr and Xe, are generated within nuclear power reactors are currently being discharged into the atmosphere. This practice has a major economic drawback because of the high value associated with some of these gases. The separations of these gases are economically prohibitive because of the high energy requirement associated with cryogenic distillation. Zeolites, nanoporous materials suitable for gas separation processes, have exhibited high selectivity for such separations. We have used nonequilibrium molecular dynamics (MD) to investigate the separation per

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