Results 311 to 320 of about 1,129,305 (370)

Study on Acoustic Properties of Helmholtz-Type Honeycomb Sandwich Acoustic Metamaterials. [PDF]

Materials (Basel)
Gai XL, Li XH, Guan XW, Xing T, Cai ZN, Hu WC.   +5 more
europepmc   +1 more source

Emitting and controlling ultra-low frequency underwater acoustic waves using a marine vibration system with time interfacing. [PDF]

Commun Eng
Huang X, Shang W, Han L, Greenhalgh S, Lin J.   +4 more
europepmc   +1 more source

Closed acoustic coupler for the reciprocity method: analytical models for microphones calibration and measurement of small components impedances

, 2005
Cécile Guianvarc'H
openalex   +1 more source

Simulation, Measurement, and Optimization of Sound Absorption in Nanofiber Membrane Composite with a Nonwoven Material. [PDF]

Polymers (Basel)
Shao X, Yan X.
europepmc   +1 more source

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Acoustic impedance estimation using calibration curve for scanning acoustic impedance microscope

2016 International Conference on Knowledge Creation and Intelligent Computing (KCIC), 2016
Ultrasonic has been used since several decades ago. One of ultrasonic application is used in medical field to observe mechanical properties of target, such as speed of sound, density, acoustic impedance, attenuation, etc. Several methods are also available to estimate mechanical property of target.
Seiji Yamamoto, Naohiro Hozumi, Sachiko Yoshida, Agus Gunawan, Kazuto Kobayashi, Yoshifumi Saijo   +5 more
openaire   +3 more sources

Seismic Acoustic Impedance Inversion via Optimization-Inspired Semisupervised Deep Learning

IEEE Transactions on Geoscience and Remote Sensing, 2022
Seismic acoustic impedance inversion (SAII) aims at recovering the subsurface impedance to achieve lithology interpretation. However, its ill-posedness and nonlinearity pose a great challenge to find an optimal solution.
Hongling Chen, Jing-Hua Gao, Wei Zhang, Ping Yang   +3 more
semanticscholar   +1 more source

Self-Enhanced Acoustic Impedance Difference Strategy for Detecting the Acidic Tumor Microenvironment.

ACS Nano, 2022
B-mode ultrasound imaging is a significant anatomic technique in clinic, which can display the anatomic variation in tissues. However, it is difficult to evaluate the functional state of organs and display the physiological information in organisms such ...
Xianfu Meng, Yan Yi, Yun-Peng Meng, G. Lv, Xingwu Jiang, Yelin Wu, Wei Yang, Yefeng Yao, Huixiong Xu, Wenbo Bu   +9 more
semanticscholar   +1 more source

Simultaneous measurement of temperature and acoustic impedance based on forward Brillouin scattering in LEAF.

Optics Letters, 2021
The detection of the surrounding environment is one of the most fundamental challenges in optical fiber sensors research. In this Letter, we report two new, to the best of our knowledge, phenomena in large effective area fiber (LEAF), which are the ...
Zelin Zhang, Yuangang Lu, Jianqin Peng, Zhengyuan Ji   +3 more
semanticscholar   +1 more source

Acoustic impedance regulation of Helmholtz resonators for perfect sound absorption via roughened embedded necks

Applied Physics Letters, 2020
Acoustic impedance regulation of a neck embedded Helmholtz resonator is realized by introducing surface roughness to the neck so as to convert the initially non-perfect sound absorber to a perfect sound absorber.
Mingyu Duan, Chenlei Yu, Zhimin Xu, F. Xin, T. Lu   +4 more
semanticscholar   +1 more source

Tympanometry and Acoustic Impedance

Acta Oto-Laryngologica, 1977
In recordings of the acoustic impedance of the middle ear (tympanometry) the change in air pressure in the ear canal will mostly influence the capacitive component of the acoustic impedance. By choosing a probe tone frequency close to the resonance frequency of the middle ear, characteristic tympanometric patterns can be demonstrated in certain middle ...
G. Lidén, G. Björkman, H. Nyman, H. Kunov   +3 more
openaire   +3 more sources