Results 51 to 60 of about 576,632 (313)

Port-Hamiltonian Control of GFM-VSCs With Robust Stable and Uniform Error Dynamics

IEEE Access, 2023
In this paper, a grid-forming (GFM) control is developed based on the nonlinear Port-Hamiltonian (PH) system theory to systematically achieve tracking control and Lyapunov-based stability by considering the power flow dynamic, voltage and current ...
Duo Wang
doaj   +1 more source

Understanding Decoherence of the Boron Vacancy Center in Hexagonal Boron Nitride

Advanced Functional Materials, EarlyView.
State‐of‐the‐art computations unravel the intricate decoherence dynamics of the boron vacancy center in hexagonal boron nitride across magnetic fields from 0 to 3 T. Five distinct regimes emerge, dominated by nuclear spin interactions, revealing optimal coherence times of 1–20 µs in the 180–350 mT range for isotopically pure samples.
András Tárkányi, Viktor Ivády
wiley   +1 more source

Quantum Property Preservation

PRX Quantum
Quantum property preservation (QPP) is the problem of maintaining a target property of a quantum system for as long as possible. This problem arises naturally in the context of open quantum systems subject to decoherence.
Kumar Saurav, Daniel A. Lidar
doaj   +1 more source

Electromechanical coupling modeling and analysis of piezoelectric damping laminated structures based on zig-zag hypothesis

Xibei Gongye Daxue Xuebao, 2022
Based on the zig-zag theory and Hamiltonian principle, the electromechanical coupling dynamic finite element(FE) model of piezoelectric damping laminated structure is established, the natural frequency and loss factor of the structure is accurately ...
WANG Xiong, GAO Yingshan, ZHANG Shunqi, DOU Weiyuan   +3 more
doaj   +1 more source

Hamiltonian-based algorithm for relaxed optimal control [PDF]

IEEE Conference on Decision and Control, 2016
This paper concerns a first-order algorithmic technique for a class of optimal control problems defined on switched-mode hybrid systems. The salient feature of the algorithm is that it avoids the computation of Fréchet or Gâteaux derivatives of the ...
Y. Wardi, M. Egerstedt, Muhammad Umer Qureshi   +2 more
semanticscholar   +1 more source

Unprecedented Spin‐Lifetime of Itinerant Electrons in Natural Graphite Crystals

Advanced Functional Materials, EarlyView.
Graphite exhibits extraordinary spintronic potential, with electron spin lifetimes reaching 1,000 ns at room temperature ‐ over 100 times longer than graphene‐based devices. Magnetic resonance spectroscopy reveals strong anisotropy: out‐of‐plane spins live 50 times longer than their in‐plane counterparts.
Bence G. Márkus, Dávid Beke, Lili Vajtai, András Jánossy, László Forró, Ferenc Simon   +5 more
wiley   +1 more source

Velocity Observer Design for Tether Deployment in Hamiltonian Framework

Aerospace
This paper presents a nonlinear velocity observer of tether deployment using the immersion and invariance technique, and the velocity observer design problem is recast as a problem of designing an attractive and invariant manifold inside the Hamiltonian ...
Jihang Yang, Guanzheng Chen, Mingming Zhang, Gangqiang Li, Jinyu Liu   +4 more
doaj   +1 more source

Coherent Control of Nitrogen Nuclear Spins via the VB−${\rm V}_B^-$‐Center in Hexagonal Boron Nitride

Advanced Functional Materials, EarlyView.
This study demonstrates coherent control of 15N nuclear spins coupled to VB−${\text{V}}_{\text{B}}^{-}$ centers in isotope‐enriched hexagonal boron nitride. Selective addressing via spin‐state mixing enables Rabi driving, quantum gates, and coherence times exceeding 10 μs$\umu{\rm s}$.
Adalbert Tibiássy, Charlie J. Patrickson, Thomas Poirier, James H. Edgar, Bruno Lopez‐Rodriguez, Viktor Ivády, Isaac J. Luxmoore   +6 more
wiley   +1 more source

Deterministic Epidemic Models for Ebola Infection with Time-Dependent Controls

Discrete Dynamics in Nature and Society, 2020
In this paper, we have studied epidemiological models for Ebola infection using nonlinear ordinary differential equations and optimal control theory.
Eric Okyere, Johnson De-Graft Ankamah, Anthony Kodzo Hunkpe, Dorcas Mensah   +3 more
doaj   +1 more source

A minimally invasive neurostimulation method for controlling abnormal synchronisation in the neuronal activity. [PDF]

PLoS Computational Biology, 2018
Many collective phenomena in Nature emerge from the -partial- synchronisation of the units comprising a system. In the case of the brain, this self-organised process allows groups of neurons to fire in highly intricate partially synchronised patterns and
Malbor Asllani, Paul Expert, Timoteo Carletti   +2 more
doaj   +1 more source