Results 111 to 120 of about 12,240 (308)

Historical Foundation and Practical Guideline for Ferroelectric Switching Kinetic Studies

Advanced Functional Materials, EarlyView.
The P and U pulses in the conventional PUND measurements are not identical because of the interplay between switching current and the measurement circuit components. This circuit effect can lead to a shift in polarization transients and misinterpreted physics in the switching kinetics.
Yi Liang, Pat Kezer, John T. Heron
wiley   +1 more source

Stabilizing Large-Scale Electric Power Grids with Adaptive Inertia

PRX Energy
The stability of ac power grids relies on ancillary services that mitigate frequency fluctuations. The electromechanical inertia of large synchronous generators is currently the only resource to absorb frequency disturbances on subsecond time scales ...
Julian Fritzsch, Philippe Jacquod
doaj   +1 more source

High-speed synchronous generators. A critical assessment

, 2017
Considering that there are electromagnetic, mechanical and thermal constraints that determine the design of high-speed electrical machines, the criteria that lead to adequate selection of the machine are established in this work.
Pere Andrada, Andrada Gascón, Pedro, Martínez Garcia, Fernando, Fernando Martínez   +3 more
core   +1 more source

Mechanoluminescent HOF Nanotransducers Enabled Sono‐Optogenetics in Parkinsonian Rats

Advanced Functional Materials, EarlyView.
We present a mechanoluminescent system utilizing porous hydrogen‐bonded organic frameworks (HOFs) as a toolkit for focused ultrasound‐triggered, non‐invasive light delivery to the deep brain in rats. This approach enables the specific activation of PV‐GPe neurons in dopamine‐depleted Parkinson's disease rat models, resulting in a comparable alleviation
Wenliang Wang, Ilya Pyatnitskiy, Yanshu Shi, Kai Wing Kevin Tang, Yi Xie, Sihan Yu, Thomas Wynn, Xiangping Liu, Ju‐Chun Hsieh, Jinmo Jeong, Weilong He, Brinkley Artman, Anakaren Romero Lozano, Xi Shi, Arjun Sangani, Lief E Fenno, Samantha Santacruz, Banglin Chen, Huiliang Wang   +18 more
wiley   +1 more source

Synchronous Generators (Part 2 of 2)

, 2023
This video, published by Columbia Gorge Community College, is the second part of a two part lecture on electrically excited synchronous generators in the unloaded condition.
Pytel, Jim
core  

Analysis of the energy harvesting performance of a piezoelectric bender outside its resonance [PDF]

, 2014
When the frequency of the source of vibration of a piezolectric generator is significantly different from its eigenfrequency, the dielectric power losses become prominent and decrease the amount of power which is practically harvested.
AMBERG, Michel, GIRAUD, Frédéric, DAWSON, Francis, GIRAUD-AUDINE, Christophe, LEMAIRE-SEMAIL, Betty, Amanci, Adrian, AMANCI, Adrien   +6 more
core   +1 more source

Designed Lewis Acid–Base Passivation for High Performance Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
ABSTRACT Silicon's high cost and long energy payback time remain major barriers to the global expansion of solar power. In contrast, metal–halide perovskites offer abundant, solution‐processable absorbers, and have achieved efficiencies of 25%–30%, positioning them as strong competitors to silicon.
Afna Manaf, Hiba Shahulhameed, Bhabani Sankar Swain, Shengzhong (Frank) Liu, Adel Najar   +4 more
wiley   +1 more source

Directly-coupled synchronous generators with converter behavior in Islanded microgrids

, 2012
Because of the increasing share of distributed generation (DG) units, a coordinated approach for their integration in the electrical network is required. Therefore, the microgrid concept has been introduced. Most DG units use power-electronic interfaces,
Vandoorn, Tine, De Kooning, Jeroen, Meersman, Bart, Vandevelde, Lieven   +3 more
core   +1 more source

Chiral Phase Change Nanomaterials

Advanced Functional Materials, EarlyView.
This work demonstrates reversible, non‐volatile phase transitions in chiral Ge2${\rm Ge}_2$Sb2${\rm Sb}_2$Te5${\rm Te}_5$ (GST) nanohelices for high‐speed optical modulation of chirality and dynamic control of the state of polarization (SOP). The chiral nanostructures are fabricated using a highly directional, wafer‐scale physical vapor deposition ...
Joshua A. Burrow, Md Shah Alam, Riad Yahiaoui, Evan M. Smith, Ryan Laing, Jules Gardener, Thomas A. Searles, Piyush J. Shah, Shivashankar Vangala, Joshua R. Hendrickson, Andrew M. Sarangan, Imad Agha   +11 more
wiley   +1 more source

Virtual synchronous generators dynamic performances

, 2014
International audienceIn this paper, dynamic performances of virtual synchronous generator are investigated. The virtual synchronous generator is based on the synchronverter (VSG) concept which is an inverter that mimics a synchronous generator (SG). The
Marinescu, Bogdan, Ben Kilani, Khadija, Mohamed Elleuch, Elleuch, Mohamed, Khadija Ben Kilani, Bogdan Marinescu, Raouia Aouini, Aouini, Raouia   +7 more
core   +1 more source