Research and application on key techniques of marine IoT by Fengzhong QU, Hangliang LAI, Jianzhang LIU, Xingbin TU, Yuan JIANG

“…Ocean observation networks with isolated and fragmented sensor data are not able to meet the demands of current ocean monitoring.Marine internet of things (IoT), which has the advantage of low investment cost, low power consumption, and interconnection is the primary research direction in the area of ocean information.An overview of the development and status of ocean observation networks was presented.A new type of marine IoT system architecture was proposed based on the Zhejiang University - Zhairuoshan Experimental Research Observatory (Z₂ERO).It features key marine IoT devices and test platforms, including scientific instrument interface module, hydroacoustic communicators, narrow-band IoT floating balls, seafloor test platforms, and portable acoustic retrievers.Future marine IoT is expected to develop toward miniaturization, intelligence, and diversity of communication methods.With the support of the terrestrial internet, the internet of everything will be achieved through an integrated space-air-ground-sea network.…”
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On the Possibility of the Jerk Derivative in Electrical Circuits by J. F. Gómez-Aguilar, J. Rosales-García, R. F. Escobar-Jiménez, M. G. López-López, V. M. Alvarado-Martínez, V. H. Olivares-Peregrino

“…Some mechanical and acoustic systems can be interpreted as jerky dynamics. …”
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Damage Detection of Refractory Based on Principle Component Analysis and Gaussian Mixture Model by Changming Liu, Di Zhou, Zhigang Wang, Dan Yang, Gangbing Song

“…Acoustic emission (AE) technique is a common approach to identify the damage of the refractories; however, there is a complex problem since there are as many as fifteen involved parameters, which calls for effective data processing and classification algorithms to reduce the level of complexity. …”
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Fracture Propagation Characteristic and Micromechanism of Rock-Like Specimens under Uniaxial and Biaxial Compression by Xue-wei Liu, Quan-sheng Liu, Shi-bing Huang, Lai Wei, Guang-feng Lei

“…The newly formed fractures are observed propagating from or near the preexisting crack tips for different specimens, while the propagation paths are affected by the loading condition obviously. Then, by adopting acoustic emission (AE) location technique, AE event localization characteristics in the process of loading are investigated. …”
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Experimental Investigation on Mechanical Properties of Cemented Paste Backfill under Different Gradations of Aggregate Particles and Types and Contents of Cementing Materials by Jiangyu Wu, Meimei Feng, Guansheng Han, Xiaoyan Ni, Zhanqing Chen

“…Consequently, the uniaxial compression tests with acoustic emission (AE) monitoring were performed on CPB, for which the aggregate particles satisfied the Talbot grading theory. …”
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Transformation of Hydroacoustic Energy into Seismoacoustic Energy at 22 Hz in Medium Depth- and Deep-Sea Conditions by Grigory Dolgikh, Mikhail Bolsunovskii, Sergey Budrin, Stanislav Dolgikh, Mikhail Ivanov, Vladimir Ovcharenko, Aleksandr Pivovarov, Aleksandr Samchenko, Vladimir Chupin, Igor Yaroshchuk

“…This experiment belongs to the field of acoustic tomography and is aimed at solving the problems of non-contact methods for studying the geological structure of the shelf areas of the World Ocean. …”
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Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles by Xuebin Gu, Weiyao Guo, Chengguo Zhang, Chuanqing Guo, Chao Wang, Fangfang Wang, Tongbin Zhao, Yang Chen

“…Uniaxial compression tests were performed on coal specimens with five fissure angles to study the mechanical behaviors and acoustic emission (AE) characteristics of fractured coals. …”
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Primary Malignant Melanoma of the Gallbladder: A Case Report and Review of the Literature by Mehmet Fatih Haskaraca, Mustafa Ozsoy, İsmail Özsan, Kamile Kurt

“…Ultrasonography revealed increased thickness of the gallbladder wall and a lesion with surrounding fluid sized 12 mm without acoustic shadow, which arose from the gallbladder wall and was consistent with a polyp. …”
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Study of SAW Based on a Micro Force Sensor in Wireless Sensor Network by Jun Wang, Yuanyuan Li, Ke Chen, Wenke Lu, Qinghong Liu, Haoxin Zhang, Huashan Yan

“…The sensitive mechanism of the surface acoustic wave (SAW) based on a micro force sensor is researched, and the principle of least squares method is used to establish a transformation model of frequency and pressure for the SAW sensor. …”
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The development of students’ science-research skills in the process of individual academic work by Irina G. Bakanova, Irina V. Alehina

“…At the same time language culture is considered as formation of rich lexicon of a person, a certain level of development of acoustical skills and also the correct use of grammatical norms. …”
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History in the making: Voicing alternation as stop lenition via an automatic analysis of large-scale corpora in French and Spanish by Yaru Wu, Ioana Chitoran, Ioana Vasilescu, Martine Adda-Decker, Lori Lamel

“…Whereas for French, the same factor comes after contextual and acoustic factors in the ranking. These results suggest that stop voicing patterns differently in these two Romance languages, although they both have a similar voiced-voiceless phonological contrast. …”
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The biodiversity survey of the Cape (BioSCape), integrating remote sensing with biodiversity science by Anabelle W. Cardoso, Erin L. Hestir, Jasper A. Slingsby, Cherie J. Forbes, Glenn R. Moncrieff, Woody Turner, Andrew L. Skowno, Jacob Nesslage, Philip G. Brodrick, Keith D. Gaddis, Adam M. Wilson

“…In situ biodiversity observations of plant and animal communities, estuaries, kelp, and plankton were made using traditional field methods as well as novel approaches like environmental DNA and acoustic surveys. Biodiversity observations were accompanied by an unprecedented combination of airborne imaging spectroscopy and lidar measurements acquired across 45,000 km2. …”
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STUDY ON THE ACOUSTO-STRUCTURAL COUPLING OF THIN CYLINDRICAL HYDRAULIC PIPE by XIE MiaoXia, GUO Ruifeng, LI LiXia, ZHANG LinJie

“…In thin hydraulic pipes,the interaction between acoustic field in the fluid and structural wave field may results in more energy loss.In order to make clear the energy loss mechanism of this kind of cylindrical pipe,an analytic study on the acousto-structural coupling of a thin cylindrical pipe is carried out using the impedance-mobility approach（ IMA） in this work.Coupled equations for describing such acousto-structural coupling are derived from the wave equation and the dynamic equation of a cylindrical shell.In deriving the dynamic equation of a cylindrical shell,wave propagation involving distortion of the cross section is considered,which is very different from general researches about hydraulic vibration.In order to validate the IMA model developed,the acousto-structural response of a cylindrical pipe filled with air is calculated using IMA and FEA,respectively,which reveals the good agreement between IMA and FEA results.…”
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TEST DIAGNOSIS AND NOISE REDUCTION RECTIFICATION OF ACCELERATING VEHICLE INTERIOR BOOMING NOISE OF A PASSENGER CAR by LIU Gang, WANG ShengBo, ZANG ZeNan, YANG Yi

“…Aiming at the roaring noise in the accelerating car of a passenger car, the corresponding troubleshooting methods for different paths when the roaring sound is diagnosed based on the transmission path are introduced; and after determining that the problem comes from the structural transmission path of the intake system, further analysis: There is a mode with a corresponding frequency at the intercooler bracket, so the engine excitation is amplified here, and coupled with the body acoustic cavity mode, and finally forms the roar of the car; furthermore, it is clear that the intercooler installation bracket structure and the The optimized plan for cooling vibration isolation is to improve the mode of the intercooler support, improve the vibration isolation effect, reduce energy transfer, eliminate modal coupling, and solve the problem. …”
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Simultaneous Measurement of Distributed Temperature and Strain through Brillouin Frequency Shift Using a Common Communication Optical Fiber by Leijun Hu, Liwen Sheng, Jisong Yan, Ligong Li, Ming Yuan, Fude Sun, Fushun Nian, Long Li, Jiaqing Liu, Shuai Zhou, Zhiming Liu

“…Benefiting from the difference of the temperature and strain sensitivity from different Brillouin peaks with different acoustic modes, our proposed sensing configuration can be used to distinguish ambient temperature and applied strain at the same time, which is an excellent candidate to address the problem of cross-sensitivity in the classical Brillouin system. …”
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Imaging the Morrow A Sandstone Using Shear Wave VSP Data, Postle Field, Oklahoma by Naser Tamimi, Thomas L. Davis

“…Characterization of the Morrow A sandstone reservoir in Postle Field, Texas County, Oklahoma, is challenging due to its small thickness, low acoustic impedance contrast with the surrounding Morrow shale, and lithological heterogeneity. …”
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Preliminary Investigation of Wavefield Depth Extrapolation by Two-Way Wave Equations by Bangyu Wu, Ru-Shan Wu, Jinghuai Gao

“…In this paper, we investigate wavefield depth extrapolators based on the full acoustic wave equations, which can propagate wave components to opposite directions. …”
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Qualitative Analysis of a Hyperchaotic Lorenz-Stenflo Mathematical Model via the Caputo Fractional Operator by Chernet Tuge Deressa, Sina Etemad, Mohammed K. A. Kaabar, Shahram Rezapour

“…The Lorenz-Stenflo mathematical model describes a complex dynamical behavior related to atmospheric acoustic-gravity waves. In this study, qualitative analysis of the four-dimensional hyperchaotic Lorenz-Stenflo system via the Caputo fractional derivative is implemented. …”
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Model validation for a noninvasive arterial stenosis detection problem by H. Thomas Banks, Shuhua Hu, Zackary R. Kenz, Carola Kruse, Simon Shaw, John Whiteman, Mark P. Brewin, Stephen E. Greenwald, Malcolm J. Birch

“…In order to develop this methodology further, we use one-dimensional shear wave experimental data from novel acoustic phantoms to validate a corresponding viscoelastic mathematical model. …”
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RESEARCH ON PLUG-IN FILLET WELD FLAW DETECTING BY USING FLEXIBLE PHASED ARRAY TECHNIQUE by QIAN ShengJie, HUANG HuanDong, SHEN ChengYe, WANG Du, HUANG Hui, CHEN DingYue

“…The beam focusing model of convex flexible phased array was theoretically analyzed. Meanwhile, the acoustic focus beam with CIVA software were simulated. …”
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