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SSRN 2024年

作者： Yin, Feng Bai, Xueyuan Wang, Ke Ru, Ang Xu, Long Tian, Wei Hao, Jiangang Zhu, Chaozhi Zhao, Gaiming College of Food Science and Technology Henan Agricultural University Henan Zhengzhou450002 China College of Animal Science and Technology Henan Agricultural University Henan Zhengzhou450002 China Henan Key Laboratory of Meat Processing and Quality Safety Control Henan Zhengzhou450002 China National Beef Cattle and Yak Industry Technology System Wulagai Comprehensive Test Station Wulagai 026321 China

The aim of this study was to elucidate the effects of different curing methods on the structural and functional properties of myofibrillar proteins and their mechanisms for improving beef quality. The results showed that the tenderness, water holding capacity and yield of beef were significantly improved after tumbling curing (p0.05) and did not have a beneficial effect on the structural and functional properties of the proteins. In conclusion, tumbling curing can better maintain the stability of protein structure and thus improve its functional properties, which can improve the quality of beef. © 2024, The Authors. All rights reserved.

关键词： Beef

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Adaptive Symbol-by-Symbol Decision Feedback Threshold Detection Receiver to Suppress Oceanic Turbulence Scintillation Effect

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SSRN 2022年

作者： Zhang, Jianlei Liang, Yingying Zhu, Yunzhou Yang, Yi Chen, Guannan Liu, Haoyu He, Fengtao School of Electronic Engineering Xi’an University of Posts & Telecommunications Xi’an710121 China Science and Technology on Underwater Information and Control Laboratory Xi’an710077 China School of Marine Science and Technology Northwestern Polytechnical University Xi’an710072 China

In this paper, an adaptive symbol-by-symbol decision feedback (DFB) threshold detection receiver is proposed that can suppress the scintillation effect of oceanic turbulence in underwater wireless optical communication (UWOC) system. The DFB receiver has a simple structure and can estimate the instantaneous channel state information (CSI) through the previously detected signal after adding pilot-symbols to the transmission data header. It thereby adaptively adjusts the decision threshold of the UWOC system receiver. The DFB receiver is independent of perfect CSI (PCSI);a channel model and transmitted signal power information are not essential for it. Moreover, the channel bandwidth can accommodate the inserted pilot-symbols. Using the gamma–gamma oceanic turbulence model, the performance of the DFB receiver under intensity fluctuation scintillation index [[EQUATION]] and [[EQUATION]] with different signal-to-noise ratios (SNRs) [[EQUATION]] and different pilot–symbol lengths [[EQUATION]] was simulated. The results showed that the performance of the proposed DFB receiver was highly similar to the performance of the ideal receiver with PCSI known in advance. When [[EQUATION]] , [[EQUATION]] , [[EQUATION]] , the bit error rate performance of the decision threshold [[EQUATION]] of the DFB receiver was the same as that of the decision threshold [[EQUATION]] of the PCSI receiver, and the SNR gain loss was 0 dB. Furthermore, a wavelet denoising method was designed to improve the DFB receiver performance. When the sampling frequency of the DFB receiver was 25 MHz, [[EQUATION]] , [[EQUATION]] , [[EQUATION]] , the proposed wavelet denoising preprocessing could obtain a SNR gain of 2.1 dB. These findings suggest that the proposed DFB receiver can promote the development of real-time applications of UWOC system. © 2022, The Authors. All rights reserved.

关键词： Scintillation

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Spiking Neuron Networks based Energy-Efficient Object Detection for Mobile Robot

Spiking Neuron Networks based Energy-Efficient Object Detect...

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2021 China Automation Congress, CAC 2021

作者： Liu, Bo-Chao Yu, Qian Gao, Jing-Wen Zhao, Shuang Liu, Xiong-Chang Lu, Yan-Feng Beijing Information Science and Technology University Beijing China Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China School of Instrument Science and Optoelectronic Engineering Beijing Information Science and Technology University Beijing China The State Key Laboratory of Management and Control for Complex Systems CASIA Beijing China Science and Technology on Underwater Vehicle Technology Laboratory Harbin Engineering University Harbin China

ISBN: (纸本)9781665426473

This paper focuses on the highly energy-efficient visual detection method, which first apples spiking neuron networks based object detection method in mobile robot. Visual perception is an important part of mobile robot, but the real-time visual perception is with high energy consumption that limits the battery running time of the robotic platform. In this paper, we bring in a Spiking-YOLO algorithm for the visual detection of the mobile robot, which combines the YOLO algorithm with the third generation artificial neural network-Spiking Neural Network (SNN). The Spiking-YOLO integrates the characteristics in real-time and high precision of the YOLO, and event-driven and low-powered nature of the SNN. We introduce the Spiking-YOLO model to the Robotnik's SUMMIT-XL mobile robot to perform the task of visual detection and the experimental verification is carried out on data sets. The experimental results show that this method has excellent energy-efficient and precision on the detection task of the robot. © 2021 IEEE

关键词： Neural networks

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Research on deduction method of underwater electric field source for ships with different conductivity of seawater

Research on deduction method of underwater electric field so...

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2019 IEEE International Conference on Power, Intelligent Computing and Systems, ICPICS 2019

作者： Ping, Hu Science and Technology on Underwater Test and Control Laborary Dalian China

ISBN: (纸本)9781728137209

The electric conductivity of seawater directly affects the attenuation law of electric field source in seawater. With the increase of conductivity in seawater, the attenuation of electric field in seawater increases, which leads to different characteristics of electric field sources in different sea areas. The magnitude and distribution characteristics of the ship's electrostatic field source are closely related to the conductivity of the sea area. Because of the limitation of the test conditions, it is difficult to obtain the electrostatic field sources under different sea water conductivity environments. In this paper, a method of deducing the field source of ship electrostatic field under different sea water conductivity is used to deduce the field source of ship electrostatic field inversion from the measured data at sea to the converted sea area, which improves the applicability and utilization value of space conversion. © 2019 IEEE.

关键词： Electric fields

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Research on Characterization Method of Ship Electric Field Source

Research on Characterization Method of Ship Electric Field S...

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2019 IEEE International Conference on Power, Intelligent Computing and Systems, ICPICS 2019

作者： Ping, Hu Kaina, Jiang Zhe, Zhao Xiaotao, Shi Science and Technology on Underwater Test and Control Laborary Dalian China

ISBN: (纸本)9781728137209

It is impossible to obtain the detailed distribution of the potential and current density of the ship hull during the actual measurement because of the complex form of the underwater electric field source and the numerous influencing parameters. Therefore, it is difficult to accurately and completely grasp the parameters of the field source. According to the characteristics of field source and the distribution of electric field in sea water, the complex field source is simplified and abstracted into dipole and quadrupole sources commonly used in electromagnetic, and the characterization of different types of electric field sources for ships is completed. © 2019 IEEE.

关键词： Electric fields

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A Full-Ocean-Depth M-Shaped Piezoelectric Actuator

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SSRN 2023年

作者： Chen, Di Yu, Pengpeng Zhang, Shiyu Zhang, Anti Wang, Liang Jin, Jiamei School of Computer Science and Technology Anhui University of Technology Ma’anshan243032 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics & Astronautics Nanjing210016 China Kunming Shipborne Equipment Research & Test Center Kunming650051 China

Due to the extremely high hydrostatic pressure in the deep sea, rigid vessels and pressure-compensation systems are usually required to protect traditional rigid actuators, which leads to a complex structure and increases the risk of structural failure. The intrinsic adaptability of piezoelectric excitation and friction drive to high hydrostatic pressure suggests that piezoelectric actuators can potentially operate in full-ocean-depth environments without the need for bulky or heavy pressure-compensation systems. Yet, the feasibility of piezoelectric actuators in extreme deep-sea high-pressure conditions remains under-explored. Here, we develop a resonant M-shaped piezoelectric actuator and test the driving performance of the prototype under varying hydrostatic pressures. The piezoelectric actuator eliminates the requirement for any rigid vessel. Our experimental results demonstrate that the prototype successfully operates under water pressure of 110 MPa - equivalent to the pressure found at a depth of 11,000 meters. Furthermore, the piezoelectric actuator's velocity remains consistent across different hydrostatic pressures ranging from 0 to 110 MPa. This is the inaugural confirmation that piezoelectric actuators can operate under water pressures comparable to those in the Mariana Trench, the Earth's deepest oceanic point. Our work highlights the significant potential of piezoelectric actuators in marine engineering, particularly in harsh full-ocean-depth conditions. © 2023, The Authors. All rights reserved.

关键词： Friction

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Experimental study on echo acquisition based on the correlation of low reverberation 49

Experimental study on echo acquisition based on the correlat...

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49th International Congress and Exposition on Noise control Engineering, INTER-NOISE 2020

作者： Yang, Baoshan Ma, Zhongcheng Zhu, Lingguo Liu, Wenzhang Dalian Scientific Test and Control Technology Institute 16 Binhai street Zhongshan District Dalian Liaoning China Science and Technology on Underwater Test and Control Laboratory 16 Binhai street Zhongshan District Dalian Liaoning China Harbin Engineering University No.145 Nantong street Nangang District Harbin City Heilongjiang Province China

ISBN: (纸本)9788994021362

In order to solve the problem of strong reverberation interference in the test of low-frequency echo characteristics of targets, the reverberation suppression method based on the time-space correlation characteristics of low-frequency reverberation is studied, and the real-time matching and suppression method of reverberation based on the separation of target echo and background reverberation based on target motion is proposed. The results show that, based on the matching processing of background reverberation and target echo parameters, this method can significantly reduce the low-frequency reverberation background in the test water area, and the reverberation in the lake test environment can be reduced by more than 10 dB, and the suppression effect is related to the correlation coefficient and phase difference of reverberation. This method has reference value for practical engineering application. © Proceedings of 2020 International Congress on Noise control Engineering, INTER-NOISE 2020. All rights reserved.

关键词： Reverberation

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Evaluation of the thermal hazard and pyrolysis mechanism of 1-allyl-3-methylimidazole nitrate and 1-propyl-3-methylimidazole nitrate via thermal analysis and DFT calculation: Effect of structural characteristics

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Journal of Molecular Liquids 2024年 404卷

作者： Zhang, Jie Zhang, Han Zhang, Xu Qian, Demeng Shu, Chi-Min Feng, Peng Anhui Huainan231001 China Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology of Sichuan Sichuan Chengdu610039 China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and Technology Guangxi Liuzhou545616 China Yunlin64002 Taiwan Shanxi Automobile Huainan Special Purpose Vehicle Co. LTD Anhui Huainan231001 China

Imidazole ionic liquid, as a green solvent, is one of the most widely used ionic liquids. Understanding its thermal safety characteristics and mechanism is the essential basis for its safe application. In this paper, the thermal hazard characteristics of two ionic liquids with typical structural characteristics are systematically studied, which were 1-allyl-3-methylimidazole nitrate and 1-propyl-3-methylimidazole nitrate ionic liquids. The thermal decomposition peculiarities of two ionic liquids were systematically analyzed by thermogravimetric analyzer, differential scanning calorimetry and accelerating rate calorimeter techniques, and the risk of thermal runaway is also evaluated. In addition, the pyrolysis products and microscopic pyrolysis mechanism of ionic liquids were studied via thermogravimetry-Fourier transform infrared spectroscopy, thermogravimetric mass spectrometry and density functional theory calculation, and the essential mechanism of thermal hazard were determined. The influence of substituent structure on the thermal hazard characteristics of imidazole nitrate ionic liquid was preliminarily analyzed from macroscopic experiment and microscopic mechanism two aspects. This study provides a theoretical basis for the safe application, design and development of imidazole nitrate ionic liquids. © 2024 Elsevier B.V.

关键词： Ionic liquids

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Design of marine environmental noise signal generation system based on MATLAB, LabVIEW and FPGA 2

Design of marine environmental noise signal generation syste...

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2nd International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2019

作者： Gao, Feng Meng, Chunxia Key Laboratory for Underwater Test and Control Technology Dalian116013 China

Marine environmental noise is a background interference field produced by various underwater sound sources. The characteristics of marine environment vary with time, place and frequency. In order to simulate the marine environmental noise signals with different time-frequency characteristics, a real-time generating system of marine environmental noise signals is designed based on MATLAB, LabVIEW and FPGA. According to the probability distribution of the measured frequency characteristics of marine environmental noise, the random signals with specific frequency response are calculated and generated in real time and continuously. The pool test results show that the signal generation system has the characteristics of stable real-time calculation and signal generation. Based on the marine environmental noise signal generation system designed in this paper, time-domain waveforms with specific spectrum characteristics are generated, which will provide technical support for the research of random signal processing algorithm under laboratory conditions and the performance analysis of underwater acoustic equipment under different marine background conditions. © 2019 IOP Publishing Ltd.

关键词： Field programmable gate arrays (FPGA)

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The Study on Inversion of Wave Equation Based on Adaptive Homotopic Regularization Method

The Study on Inversion of Wave Equation Based on Adaptive Ho...

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Communication, Image and Signal Processing (CCISP), International Conference on

作者： Jingying Wang GuoFeng Feng Yunfei Zhu Bing Jia Yunfei Chen Rui Wang Science and Technology on Underwater Test and Control Laboratory Dalian China Harbin Engineering University Harbin China

ISBN: (数字)9781728185897

ISBN: (纸本)9781728185903

The inversion of wave equation has a widespread applications in practice in the detection of buried targets. It faces non-linear and ill-posedness difficulties. Aiming to the ill- posedness and non-linear nature of the inverse problem of wave equation, the widely convergent homotopy method and regularization method are combined to constructing of minimum optimization equation. The linear relationship between homotopy parameters and regularization parameters is constructed in order to avoid the uncertainty of regularization parameters selected by experience. Then the adaptive homotopy regularization inversion method is formed by combining this technique with the Regularization- Gauss-Newton method. The results of numerical experiments show that the method is effectively deal with nonlinear and ill-posedness problem of buried target detection.

关键词： Propagation Mathematical model Inverse problems Optimization Numerical simulation Jacobian matrices Earthquakes

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