Results 11 to 20 of about 1,573,169 (358)

Acoustic coherent perfect absorption based on a PT symmetric coupled Mie resonator system

APL Materials, 2023
Parity-time (PT) symmetric coupled resonator systems have exhibited intriguing and unexpected properties in optics and electronics. Here, we extend it to acoustics and report a coupled Mie resonators (MRs) system respecting PT symmetry.
Fangfang Ju, Chen Liu, Ying Cheng, Shengyou Qian, Xiaojun Liu   +4 more
doaj   +2 more sources

Utilizing Waste Cotton/Pigeon Pea Stalk Fibers Composites for Enhanced Sound Absorption and Insulation in Automotive Interiors

Journal of Natural Fibers
This study investigates the synthesis and characterization of composite materials, pigeon pea stem, and cotton fibers blended in different ratios such as 100/0, 70/30, 60/40, 50/50, 30/70, and 0/100.
Ariharasudhan Subramanian, Senthil Kumar Selvaraj, Rajaram Mani, Preethibha Chandrasekaran, Shanthi Kunjuraman, Ramratan Guru, Sakthivel Santhanam   +6 more
doaj   +2 more sources

3D‐Printed Lattice Structures for Sound Absorption: Current Progress, Mechanisms and Models, Structural‐Property Relationships, and Future Outlook

Advanced Science, 2023
The reduction of noises, achieved through absorption, is of paramount importance to the well‐being of both humans and machines. Lattice structures, defined as architectured porous solids arranged in repeating patterns, are emerging as advanced sound ...
Xinwei Li, Jun Wei Chua, Xiang Yu, Zhendong Li, Miao Zhao, Zhonggang Wang, Wei Zhai   +6 more
doaj   +2 more sources

Nonlinear Optical Absorption in Nanoscale Films Revealed through Ultrafast Acoustics [PDF]

Nano letters (Print), 2022
Herein we describe a novel spinning pump-probe photoacoustic technique developed to study nonlinear absorption in thin films. As a test case, an organic polycrystalline thin film of quinacridone, a well-known pigment, with a thickness in the tens of ...
Ievgeniia Chaban, Radosław Deska, Gaël Privault, Elżbieta Trzop, Maciej Lorenc, Steven E. Kooi, Keith A. Nelson, Marek Samoć, Katarzyna Matczyszyn, Thomas Pézeril   +9 more
openalex   +3 more sources

Tunable Perforated Panel Sound Absorbers for Variable Acoustics Room Design

Applied Sciences
Variable acoustics systems are promising engineering developments for multi-purpose rooms and workspaces in many buildings. However, due to space requirements associated with most of the tuning devices used for that purpose, these solutions are hardly ...
Jesús Carbajo, Pedro Poveda-Martínez, Luís Godinho, Andreia Pereira, Anna Gaspar, Paulo Amado-Mendes, Diogo Mateus, Jaime Ramis   +7 more
doaj   +2 more sources

Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials

Nanomaterials, 2022
Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution.
Xiuhong Li, Yujie Peng, Youqi He, Chupeng Zhang, Daode Zhang, Yong Liu   +5 more
doaj   +2 more sources

Perfect, broadband, and sub-wavelength absorption with asymmetric absorbers: Realization for duct acoustics with 3D printed porous resonators

Journal of Sound and Vibration, 2021
Jean Boulvert, Thomas Humbert, Vicente Romero‐García, Gwénaël Gabard, Edith Roland Fotsing, Annie Ross, Jacky Mardjono, Jean‐Philippe Groby   +7 more
openalex   +3 more sources

The Effects of Sound Absorption of Stage House on the Acoustics of Auditorium in an Opera House [PDF]

Buildings
The coupling effects between the stage house and the auditorium in opera houses make the sound field very complex. In the present study, the effects of stage absorption on the primary monaural objective room acoustic parameters in the seating area of an ...
Jianliang Gao, Yuezhe Zhao, Lili Pan
openalex   +2 more sources

Optimizing Museum Acoustics: How Absorption Magnitude and Surface Location of Finishing Materials Influence Acoustic Performance [PDF]

Acoustics
The architecture of contemporary museums often emphasizes visual aesthetics, such as large volumes, open-plan layouts, and highly reflective finishes, resulting in acoustic challenges, such as excessive reverberation, poor speech intelligibility ...
Jenny Milena, Jonas Braasch
openalex   +2 more sources

Coherent perfect absorption at an exceptional point [PDF]

Science, 2021
Description Absorbingly exceptional Most oscillating systems have a resonance or multiple resonances at which they ring out and are most sensitive to excitation. In non-Hermitian systems, open systems with gain and loss, the resonances have been found to
Changqing Wang, William R. Sweeney, A. Stone, Lan Yang   +3 more
semanticscholar   +1 more source