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Reinforcement learning algorithm for improving speed response of a five-phase permanent magnet synchronous motor based model predictive control.
PLoS One
January 2025
Department of Electrical Power and Machines Engineering, Higher Institute of Engineering (HIE), El-Shorouk Academy, El-Shorouk City, Egypt.
Enhancing the performance of 5ph-IPMSM control plays a crucial role in advancing various innovative applications such as electric vehicles. This paper proposes a new reinforcement learning (RL) control algorithm based twin-delayed deep deterministic policy gradient (TD3) algorithm to tune two cascaded PI controllers in a five-phase interior permanent magnet synchronous motor (5ph-IPMSM) drive system based model predictive control (MPC). The main purpose of the control methodology is to optimize the 5ph-IPMSM speed response either in constant torque region or constant power region.
View Article and Find Full Text PDFTransport Properties of a Half-Filled Chern Band at the Electron and Composite Fermion Phases.
Phys Rev Lett
December 2024
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
We consider a half-filled Chern band and its transport properties in two phases that it may form: the electronic Fermi liquid and the composite-fermion Fermi liquid. For weak disorder, we show that the Hall resistivity for the former phase is very small, while for the latter it is close to 2h/e^{2}, independent of the distribution of the Berry curvature in the band. At rising temperature and high frequency, we expect the Hall resistivity of the electronic phase to rise, and that of the composite-fermion phase to deviate from 2h/e^{2}.
View Article and Find Full Text PDFFiber Vector Light-Field-Based Tip-Enhanced Raman Spectroscopy.
Nano Lett
January 2025
Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.
Tip-enhanced Raman spectroscopy (TERS) has been extensively employed to investigate the light-matter interaction at the nanoscale. However, the current TERS strategies lack the ability to excite the low-background inhomogeneous electromagnetic field with significant enhancement of electric field, electric field gradient, and optomagnetic field, simultaneously. To overcome this, we developed a fiber vector light-field-based TERS strategy aimed at exploring the multipole Raman scattering processes of molecules.
View Article and Find Full Text PDFThe Nordic-walking mechanism and its explanation of deconfined pseudocriticality from Wess-Zumino-Witten theory.
Nat Commun
January 2025
CP3-Origins, University of Southern Denmark, Odense, Denmark.
The understanding of phenomena falling outside the Ginzburg-Landau paradigm of phase transitions represents a key challenge in condensed matter physics. A famous class of examples is constituted by the putative deconfined quantum critical points between two symmetry-broken phases in layered quantum magnets, such as pressurised SrCu(BO). Experiments find a weak first-order transition, which simulations of relevant microscopic models can reproduce.
View Article and Find Full Text PDFRobust skin-integrated conductive biogel for high-fidelity detection under mechanical stress.
Nat Commun
January 2025
Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore.
Soft conductive gels are essential for epidermal electronics but often face challenges when interfacing with uneven surfaces or areas with extensive hair, especially under mechanical stress. In this study, we employed the concept of liquid-to-solid transformation to enhance integration at biointerfaces and designed an in-situ biogel capable of rapidly transitioning between liquid and solid states within 3 min via a temperature switch. The biogel features a semi-interpenetrating polymer network design and dual conduction pathways, resulting in high tensile strength (~1-3 MPa), a skin-compatible modulus (~0.
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