Results 21 to 30 of about 456 (152)
A hybrid acoustic structure for low-frequency and broadband underwater sound absorption
Journal of Low Frequency Noise, Vibration and Active Control, 2022 The underwater anechoic coating with local resonant units is an effective method to achieve low-frequency sound absorption. However, the structure obtained in this way is not satisfactory in the sound absorption effect of mid-high frequency bands ...
Xinyu Jia +4 more
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Acoustic behavior of composites with gradient impedance
Materials & Design, 2020 Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance.
Yiwen Feng, Jing Qiao, Longqiu Li
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Cogent Engineering, 2018 Nowadays, research on underwater sound absorbing coatings is important on marine combats. Due to high cost of acoustic experimental tests, determination of an accurate simulation method for assessment of the coating characteristics is an important goal ...
Sayed Hamid Sohrabi +1 more
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Sound absorption performance of underwater anechoic coating in plane wave normal incidence condition [PDF]
IOP Conference Series: Materials Science and Engineering, 2019 On account of the theory of non-uniform waveguide and the wave propagation theory in layered media, a complete theoretical model is established for predicting the sound absorption performance of multi-layer underwater composite anechoic coating. Furthermore, the correctness of the theoretical calculation is verified by the finite-element simulation ...
Z Zhang, L Li, Y Huang, Q Huang
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Materials Research Express, 2020 In this paper, a novel compact quad-band polarization insensitive metamaterial absorber has been proposed to be employable in the microwave frequency regime.
Raghvenda Kumar Singh +5 more
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Advanced Science, EarlyView.This study introduces a novel metamaterial absorber integrating water as a lossy medium with patterned indium tin oxide (ITO) films to achieve simultaneous optical transparency and ultra‐wideband electromagnetic absorption over 0.52‐40 GHz. It effectively overcomes the limitations of conventional opaque and bulky shielding materials, offering a ...
Xiaojun Huang +5 more
wiley +1 more source
Advanced Science, EarlyView.ABSTRACT The spin Hall effect is a well‐known phenomenon in spintronics that has found numerous applications in digital electronics (memory and logic), but relatively few in analog electronics. Practically the only analog application in widespread use is the spin Hall nano‐oscillator (SHNO) that delivers a high frequency alternating current or voltage ...
Raisa Fabiha +6 more
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ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.This stretchable active frequency selective fabric achieves reversible switching between bandstop and transparent states through strain‐induced reconfiguration of its conductive network. Its zero‐power and mechanically tunable characteristics offer potential for wearable electromagnetic functional materials.
Hao Feng +6 more
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Zhongguo Jianchuan YanjiuObjectiveAs specific and demanding requirements are imposed by measuring the impedance of the anechoic coatings on the hull surface of an underwater vehicle using the traditional water-filled tube experiment, a method of sound absorption coefficient ...
Fan ZHANG +3 more
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Sensors, 2019 In this paper, the design and development of a bio-inspired UHF sensor for partial discharge detection in power transformers is presented. The UHF sensor was developed for external use in dielectric windows of power transformers.
Luiz A. M. M. Nobrega +5 more
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