Results 81 to 90 of about 22,575 (260)

Enhanced Low-Frequency Sound Absorption of a Porous Layer Mosaicked with Perforated Resonator. [PDF]

Polymers (Basel), 2022
Li X, Liu B, Wu Q.
europepmc   +1 more source

A Monolithic Janus Hydrogel Pressure Sensor for Wearable Motion and Physiological Monitoring

Advanced Science, EarlyView.
This work reports a monolithic Janus hydrogel pressure sensor featuring integrated conductive PEDOT and insulating PEGDA layers. The fabricated device achieves a rapid response time, a wide operating range, and good cyclic durability. The sensor demonstrates robust performance in tracking dynamic human joint motions, offering a scalable strategy for ...
Syed Atif Ali, Zeeshan Alam Ansari, Reynaldo Carlos Kuizon Montalbo, Hailemichael Ayalew, Yu‐Sheng Hsiao, Chih‐Wei Chu, Hsiao‐hua Yu, Hsiung‐Lin Tu   +7 more
wiley   +1 more source

Study on acoustic performance of new spiral sound absorbing and insulating metamaterial

Journal of Low Frequency Noise, Vibration and Active Control
Middle and low frequency band sound waves have strong penetration and diffraction abilities during the propagation process, making it difficult to attenuate.
Song Liu, Pan-pan Liu, Ren-jie Zhao, Jian-hua Lu, Kang Yang, Huayu Zhou, Yi-fan Du   +6 more
doaj   +1 more source

Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials. [PDF]

RSC Adv, 2021
Chang L, Jiang A, Rao M, Ma F, Huang H, Zhu Z, Zhang Y, Wu Y, Li B, Hu Y.   +9 more
europepmc   +1 more source

Physics‐Aware Machine‐Learning‐Driven Inverse Design of Broadband Ultra‐Open Acoustic Metamaterials

Advanced Science, EarlyView.
A physics‐aware machine‐learning framework enables inverse design of ultra‐open acoustic silencers by decoupling spectral and radial design spaces. The approach rapidly identifies broadband, compact, and highly ventilated architectures, while revealing hidden linear design rules that link geometry, impedance matching, and acoustic performance.
Zhiwei Yang, Mengyu Li, Xiaohang Xie, Ao Chen, Thomas G. Bifano, Xin Zhang   +5 more
wiley   +1 more source

A low-frequency anechoic coating under high hydrostatic pressure by pressure balancing strategy

Journal of Low Frequency Noise, Vibration and Active Control
It has always been a challenge to develop low-frequency anechoic coatings under high hydrostatic pressure. Based on active pressure balancing strategy (APBS), the airbag embedding in Helmholtz resonator model is proposed to achieve low-frequency and ...
Ningdong Hu, Jun Jin, Hongping Hu
doaj   +1 more source

Soft Hypoxia‐Adaptive Bioelectronics Integrating PEDOT:PSS/Polydopamine/Enzyme Biocomposites for Closed‐Loop Therapeutics of Chronic Wounds

Advanced Science, EarlyView.
Hypoxia‐adaptive bioelectronics based on poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/polydopamine (PDA)/enzyme biocomposites couple O2‐centric biosensing with embedded O2 therapy to address oxygen‐deficient chronic wounds. Local O2 provision restores enzyme‐based metabolite sensing, while catalase‐mediated oxygen generation and
Songrui Liu, Bowen Yang, Cao Qi, Zhijie Zhou, Haochen Zou, Anjum Qureshi, Xiao Zhao, Ting Li, Li Gao, Ye Tao, Gang Song, Pingqiang Cai, Zheng Li, Zhiyuan Liu, Dianpeng Qi, Ting Wang, Lianhui Wang   +16 more
wiley   +1 more source

Single‐Sensor Vibration Sensing in Anisotropic Composites Enabled by Disordered Metasurfaces

Advanced Science, EarlyView.
This work develops a single‐sensor vibration sensing (SSVS) framework that integrates disordered metasurfaces with compressive sensing. Comprehensive numerical and experimental validations demonstrate that, by manipulating anisotropic guided wave propagation through metasurfaces, the proposed SSVS framework enables high‐fidelity multi‐source vibration ...
Jianjie Zhang, Lanhe Xu, Zhongzheng Zhang, Yongbo Li, Eric Li, Asoke K. Nandi, Bing Li   +6 more
wiley   +1 more source

Comparing Optimized Sound Absorption Coefficient of Aluminum Foam with Local Search Algorithm, Genetic Algorithm, and Particle Swarm Optimization [PDF]

Journal of Environmental Health and Sustainable Development
Introduction: The principle of passive sound control is based on the phenomenon of sound absorption by absorbers. The factors affecting sound absorption include porosity, pore size, pore opening size, thickness, and air flow resistance.
Rohollah Fallah Madvari, Mohsen Niknam Sharak, Mohammad Javad Jafari, Faezeh Abbasi Balochkhaneh   +3 more
doaj  

Ocean Acidification and the Increasing Transparency of the Ocean to Low-Frequency Sound [PDF]

Oceanography, 2009
As the ocean becomes more acidic, low-frequency (~ 1–3 kHz and below) sound travels much farther due to changes in the amounts of pH-dependent species such as dissolved borate and carbonate ions, which absorb acoustic waves.
Peter G. Brewer, Keith Hester
doaj