Results 41 to 50 of about 586 (214)

Performance Analysis and Model Improvements for Electromagnetic Transient State Estimators

IEEE Access
State estimation techniques for the study of electromagnetic transients use measurement records to analyze the propagation of such effects to other unmonitored locations within an electrical grid.
Humberto Cunha de Oliveira, Vinicius Henrique Faria Brito, Jose Carlos de Oliveira, Isaque Nogueira Gondim   +3 more
doaj   +1 more source

Closed-Loop Gate Drive for Single-Ended Forward Converter to Reduce Conducted EMI

IEEE Access, 2020
Forward DC/DC converters are widely used in low and medium power circuits that are widely used in the aerospace and navigation fields. Power converters are usually sources of electromagnetic interference (EMI), which is due to their higher voltage and ...
Congwen Xu, Qishuang Ma, Ping Xu, Nan Wang   +3 more
doaj   +1 more source

n‐Type Polymer Radio Frequency Rectifiers Operating at 18.5 GHz

Advanced Materials, EarlyView.
Combining an n‐doped polymer semiconductor with wafer‐scale asymmetric planar electrodes featuring work function‐engineered contacts yields radio‐frequency diodes and rectifying circuits operating at up to 18.5 GHz. The devices combine scalable manufacturing with an operating frequency previously unattainable by large‐area organic electronics ...
Lazaros Panagiotidis, Filip Aniés, Yiyang Yu, Mohammed Ghadiyali, Hendrik Faber, Zhanibek Bizak, Youssef Kabri, Pavlos Tzourmpakis, Suman Mandal, Linqu Luo, Temur Maksudov, Mohamad Insan Nugraha, Harold F. Mazo‐Mantilla, Patrice Vanelle, Julie Broggi, Khaled N. Salama, Udo Schwingenschlögl, Martin Heeney, Atif Shamim, Thomas D. Anthopoulos   +19 more
wiley   +1 more source

Why Is the Mechanism Underlying the Chiral‐Induced Selectivity Effect Still Challenging?

Advanced Materials, EarlyView.
The chiral‐induced spin selectivity (CISS) effect is observed in many experimental configurations and for different materials. However, there are theoretical challenges in attempting to explain those results. A qualitative framework for explaining all the results is presented.
Ron Naaman, Yossi Paltiel
wiley   +1 more source

Generating Unconventional Spin‐Orbit Torques With Patterned Phase Gradients in Tungsten Thin Films

Advanced Materials, EarlyView.
ABSTRACT A key aim in spintronics is to achieve current‐induced magnetization switching via spin‐orbit torques without external magnetic fields. For this, the focus of recent work has been on introducing controlled lateral gradients across ferromagnet/heavy‐metal devices, giving variations in thickness, composition, or interface quality.
Lauren J. Riddiford, Anne Flechsig, Shilei Ding, Emir Karadža, Niklas Kercher, Tobias Goldenberger, Elisabeth Müller, Pietro Gambardella, Laura J. Heyderman, Aleš Hrabec   +9 more
wiley   +1 more source

Analysis and Optimization of Power MOSFETs Shaped Switching Transients for Reduced EMI Generation

IEEE Access, 2017
The abrupt change in current or voltage caused by the rapid switching action of power semiconductor devices will generate high-frequency electromagnetic interference (EMI) and needs to be located as the primary interference sources in power electronics ...
Tongkai Cui, Qishuang Ma, Ping Xu, Yuchen Wang   +3 more
doaj   +1 more source

Programming of Complex Magnetic Profiles Enforced by 4D Printed Magnetic LCE Actuators

Advanced Materials, EarlyView.
A 4D printing‐enabled magnetic programming strategy is introduced in which thermally actuated liquid crystal elastomers are magnetized in their target shape to encode complex three‐dimensional magnetic profiles. The resulting actuators achieve multistate shape morphing and programmable locomotion under low magnetic fields, without requiring specialized
Erick R. Espíndola‐Pérez, Rahul Goyal, Lovish Gulati, María López‐Valdeolivas, Peer Fischer, Carlos Sánchez‐Somolinos   +5 more
wiley   +1 more source

Phase Engineering of Nanomaterials (PEN): Evolution, Current Challenges, and Future Opportunities

Advanced Materials, EarlyView.
This review summarizes the synthesis, phase transition, advanced characterization spanning ex situ to in situ and operando techniques, and diverse applications of phase engineering of nanomaterials (PEN). It further outlines key challenges and future opportunities, such as phase stability, architecture control, and artificial intelligence (AI)‐driven ...
Ye Chen, Zhanxi Fan, Jingjie Ge, Qiyuan He, Zhuangchai Lai, Jiawei Liu, Chaoliang Tan, Hua Zhang   +7 more
wiley   +1 more source

Time-Domain Power Quality State Estimation Based on Kalman Filter Using Parallel Computing on Graphics Processing Units

IEEE Access, 2018
A methodology is developed to assess the time-domain power quality state estimation (PQSE) in electrical systems based on the Kalman filter implemented using parallel processing techniques through graphics processing units (GPUs) to reduce the execution ...
Rafael Cisneros-Magana, Aurelio Medina, Venkata Dinavahi, Antonio Ramos-Paz   +3 more
doaj   +1 more source

Reactive Power Injection to Mitigate Frequency Transients Using Grid Connected PV Systems

Energies, 2020
The increasing integration of renewable energies reduces the inertia of power systems and thus adds stiffness to grid dynamics. For this reason, methods to obtain virtual inertia have been proposed to imitate mechanical behavior of rotating generators ...
Yujia Huo, Simone Barcellona, Luigi Piegari, Giambattista Gruosso   +3 more
doaj   +1 more source