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Alexander A. Komissarov, Denis V. Makarov, Andrey O. Kholmogorov and Renat B. Shakirov
Bottom formations known as pockmarks basically arise due to extensive gas emission. Active pockmarks are characterized by exceptionally high gas saturation and substantially reduced sound speed. The latter circumstance leads to strong attenuation of soun...
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Jinshun Hu, Yongshui Lin, Zhiwei Zhou, Xiaofei Cao, Qingjia Chi and Weiguo Wu
To further improve the low-frequency broadband sound absorption capability of the underwater anechoic layer (UAL) on the surface of marine equipment, a novel sound absorption structure with cavities (NSSC) is designed by adding resonators and honeycombs ...
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Kangkang Shi, Dongsheng Li, Dongsen Hu, Qi Shen and Guoyong Jin
The acoustic absorption characteristics of anechoic coatings attached to the surface of underwater vehicles are closely related to their acoustic stealth. Owing to the essential property of local resonance, the narrow sound-absorption band cannot meet th...
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Grigorios-Aris Cheimariotis and Nikolaos Mitianoudis
This work describes a methodology for sound event detection in domestic environments. Efficient solutions in this task can support the autonomous living of the elderly. The methodology deals with the ?Challenge on Detection and Classification of Acoustic...
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Guang Yang, Kainan Guan, Li Zou, Yibo Sun and Xinhua Yang
The cold metal transfer (CMT) process is widely used in thin plate welding because of its characteristics of low heat input and stable arc. In actual production, a larger weld gap, misalignment, or other problems due to assembly error lead to serious wel...
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Jingqiang Wang, Zhengyu Hou, Guanbao Li, Guangming Kan, Baohua Liu, Xiangmei Meng, Qingfeng Hua and Lei Sun
The acoustic characteristics of three fine-grained sediments (silty sand, silt, silty clay) in the South China Sea (SCS) were measured and analyzed at high frequency range of 27?247 kHz. The measurement results show that the sound speed dispersion is a p...
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Xin Li, Bilong Liu and Chong Qin
A perforated plate with stepwise apertures (PPSA) is proposed to improve sound absorption for low frequencies. In contrast with an ordinary perforated plate with insufficient acoustic resistance and small acoustic mass, the perforated plate with stepped ...
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Hansoo Kim and Dong-Guk Paeng
Acoustic waves are attenuated by fish schools as they propagate through the ocean. The attenuation by fish schools is not currently considered in fishery acoustics and sonar applications, especially at mid-frequency bands. In this study, fish school atte...
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Esther Blumendeller, Ivo Kimmig, Gerhard Huber, Philipp Rettler and Po Wen Cheng
The expansion of renewable energy usage is one of the major social tasks in Europe and therefore requires acceptance and support from the population. In the case of onshore wind turbines, the complaints of local residents are often interpreted as infraso...
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Felix Scholkmann
The public is unknowingly exposed to very high-frequency sound (VHFS; 11.2?17.8 kHz) and ultrasound (US; >17.8 kHz) signals in air in public places, as evidenced by previously published reports. The present report provides evidence for the presence of VH...
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Halil Ozkurt and Ozlem Altuntas
All living organisms perceive mechanical signals, regardless of their taxonomic classifications or life habits. Because of their immobility, plants are influenced by a variety of environmental stresses, such as mechanical stress, during their growth and ...
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Boyun Liu and Liang Yang
The characteristics of acoustic wave transmitting in a metamaterial-type seawater piping system are studied. The metamaterial pipe, which consists of a uniform pipe with air-water chamber Helmholtz resonators (HRs) mounted periodically along its axial di...
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Boyun Liu and Liang Yang
The characteristics of acoustic wave transmitting in a metamaterial-type seawater piping system are studied. The metamaterial pipe, which consists of a uniform pipe with air-water chamber Helmholtz resonators (HRs) mounted periodically along its axial di...
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Boyun Liu and Liang Yang
The characteristics of acoustic wave transmitting in a metamaterial-type seawater piping system are studied. The metamaterial pipe, which consists of a uniform pipe with air-water chamber Helmholtz resonators (HRs) mounted periodically along its axial di...
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Xiaoxing Su, Jixing Qin and Xiangshuai Yu
This paper reports the interference pattern of an acoustic field in the 100?300 Hz frequency band observed in a shallow water experiment. Assuming there is a conventional fluid sea bottom, the observed interference pattern is first demonstrated to potent...
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Oleg E. Gulin and Igor O. Yaroshchuk
For a low-frequency sound signal propagating in a two-dimensionally inhomogeneous shallow-water waveguide, the influence of random bathymetry (fluctuating bottom boundary) was considered based on the local-mode approach and statistical modeling using fir...
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Rongxin Wang, Xiaomei Xu, Zheguang Zou, Longfei Huang and Yi Tao
Underwater sound generated by the rapidly increasing offshore wind farms worldwide greatly affects the underwater soundscape and may cause long-term cumulative effects on sound-sensitive marine organisms. However, its analysis and impact assessment are h...
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Shizhao Zhang and Shengchun Piao
In order to analyze the frequency periodicity characteristics of acoustic field interference and realize acoustic source ranging (ASR), the normal mode model is used to analyze the interference characteristics of the broadband acoustic field under the co...
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Jong-Ho Choi, Kye-Won Jun and Chang-Deok Jang
Bed-load discharge of a river can be monitored by indirectly measuring the acoustic pulses generated when the bed load collides with a steel pipe installed on the riverbed (i.e., pipe hydrophone measurement). However, existing methods used for filtering ...
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Xinmin Shen, Panfeng Bai, Xiaocui Yang, Xiaonan Zhang and Sandy To
The optimal combination structure low frequency sound absorber can be used in acoustic environmental protection and industrial noise reduction.
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