Results 81 to 90 of about 1,130 (256)

Resonance in Bottles with Different Shapes

International Scholastic Journal of Science, 2012
The Helmholtz Resonance equation derived in the 1800’s describes the nature of resonance in narrow-necked vessels, known as Helmholtz Resonators.
Amy Elliott
doaj  

High‐Pressure Modulation of Breathing Kagome Lattice: Cascade of Lifshitz Transitions and Evolution of the Electronic Structure

Advanced Science, EarlyView.
External pressure directly tunes the breathing distortion of the kagome lattice in Fe3Sn2, suppressing it near 15 GPa and reversing it at higher pressures. This structural modulation drives a cascade of Lifshitz transitions, reconstructs the Fermi surface, strengthens electronic correlations and carrier localization, and modifies ultrafast electron ...
Marcos Vinicius Gonçalves‐Faria, Maxim Wenzel, Yuk Tai Chan, Olga Iakutkina, Francesco Capitani, Davide Comboni, Michael Hanfland, Qi Wang, Hechang Lei, Martin Dressel, Alexander A. Tsirlin, Alexej Pashkin, Stephan Winnerl, Manfred Helm, Ece Uykur   +14 more
wiley   +1 more source

Review on Resonator and Muffler Configuration Acoustics

Archives of Acoustics, 2018
Nowadays, resonators are widely used in automobile, industrial applications, aerospace engineering, and some other fields. One of the unique characteristics of resonators which made them highly convenient is their acoustic capability to attenuate noise ...
Muhammad Hariz KHAIRUDDIN, Mohd Farid Muhamad SAID, Afiq Aiman DAHLAN, Khairuldean Abdul KADIR   +3 more
doaj   +1 more source

A Magnetic‐Driven Self‐Rotation‐Stabilized Miniature Swimming Robot

Advanced Science, EarlyView.
Inspired by the stable rotational descent of seeds in nature, this study designs a magnetic‐driven self‐rotation‐stabilized miniature swimming robot (MSMSR). Based on a resonance‐driven strategy, the robot exhibits high swimming performance, offering enhanced directional swimming and improved resistance to water flow disturbances compared to existing ...
Fujun Wang, Chuhan Zhang, Hao Zhang, Yanling Tian, Cunman Liang   +4 more
wiley   +1 more source

Enhancing Helmholtz Resonance Prediction in Acoustic Barriers Based on Sonic Crystals

Applied Sciences
Environmental noise is a growing public health issue, particularly in dense urban environments and areas adjacent to transport infrastructure. Passive acoustic barriers have been a widely adopted solution, although their functional and aesthetic ...
Lucas Onrubia-Fontangordo, José María Bravo Plana-Sala, Juan Vicente Sánchez-Pérez, Sergio Castiñeira-Ibáñez   +3 more
doaj   +1 more source

MOF‐Derived Cu‐TiO2/Alginate Micromotors for Buoyancy‐Regulated 3D Motion

Advanced Science, EarlyView.
In this work, cyanobacteria‐inspired sodium alginate (SA)/Cu‐TiO2/Fe3O4 hydrogel micromotors generate and encapsulate O2 microvesicles upon light irradiation, enabling buoyancy‐mediated Z‐axis upward migration and surface enrichment at the light‐exposed water‐air surface.
Wei Zou, Qing Wu, Jiawei Lin, Kunchen Li, Yulong Ying, Josep Puigmartí‐Luis, Salvador Pané, Sheng Wang   +7 more
wiley   +1 more source

Giant Direct Magnetoelectric Effect in Nanocomposite CoFe2O4:PVDF‐TrFE Thin Films

Advanced Science, EarlyView.
A novel three‐step grow‐etch‐fill fabrication approach creates structured cobalt ferrite/ferroelectric polymer nanocomposites with high interfacial areas. Driven by efficient strain‐mediated coupling, this crystalline system achieves a giant room‐temperature magnetoelectric coefficient nearly two orders of magnitude higher than other CFO/PVDF‐TrFE thin
Muireann de h‐Óra, Lynette Keeney, Rui Miguel Gonçalves Carvalho, Aliona Nicolenco, Tuhin Maity, Jordi Sort, Luís Amorim, Pedro Martins, Judith MacManus‐Driscoll   +8 more
wiley   +1 more source

All-angle wideband acoustic self-collimation by Helmholtz resonators

Results in Physics
Phononic crystals and acoustic metamaterials have transformed acoustic wave control over the past three decades, enabling unprecedented manipulation of sound through tailored structural periodicity and local resonances.
David Ramírez-Solana, Muhammad Gulzari
doaj   +1 more source

Co‐Ligand‐Induced Electronic Modulation Controls Substrate Adsorption and Selectivity in Biomass Electrooxidation

Advanced Science, EarlyView.
A molecular design strategy is reported that introduces distinct anionic co‐ligands into Cu‐based catalysts to modulate the electronic density of the metal center and, consequently, its interaction with both OHads and HMF. The work establishes co‐ligand engineering as an effective strategy for precise interfacial adsorption control in electrocatalysis,
Chen Gao, Bin Han, Shuai Chen, Shuai Yan, Ralf Weisbarth, Jorg Daniels, Nikolay Kornienko   +6 more
wiley   +1 more source

Acoustic Properties of Surfaces Covered by Multipole Resonators

Acoustics
Different types of resonators are used to create acoustic metamaterials and metasurfaces. Recent studies focused on the use of multiple resonators of the dipole, quadrupole, octupole, and even hexadecapole types.
Nikolay Kanev
doaj   +1 more source