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2020 2nd International Conference on Civil, Architecture and Urban Engineering, ICCAUE 2020

作者： Han, Jing Zhang, Xuegang Wu, Zhongpeng Cao, Feng Science and Technology on Underwater Test and Control Laboratory Dalian116013 China

This work devoted to research the temperature and salinity distribution in ocean turbulence. The sound velocity when ocean turbulence presented was calculated by the function relation between temperature, salinity, depth and sound velocity. The sound transmission loss was calculated when the ocean turbulence was presented or not and compared them. The sound field fluctuation resulted by ocean turbulence was analyzed. It was very significant to comprehend the mechanism and variation rule of ocean turbulence. Thus it was further study the effect of ocean turbulence on acoustic propagation. As an example, there was thermocline in the ocean water. The sound transmission loss was calculated when presented ocean turbulence or not. It analyzed the effect of ocean turbulence on acoustic propagation. The sound field fluctuation caused by ocean turbulence could reach 8dB. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Acoustic fields

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Ferric citrate enhanced bioreduction of Cr(VI) by Bacillus cereus RCr in aqueous solutions: reduction performance and mechanisms

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Environmental science and Pollution Research 2024年第36期31卷 48972-48985页

作者： Wang, Yishuo Huang, Fei Liu, Jiaxin Rao, Xin Liu, Qianjun Xiao, Rongbo Huang, Mingzhi Li, Haolin Bai, Jinjing Wang, Peng Zhou, Xiao Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China School of Mathematics and Statistics Guangdong University of Foreign Studies Guangzhou510420 China Guangdong Provincial Engineering Research Center of Intelligent Low-Carbon Pollution Prevention and Digital Technology South China Normal University Guangzhou510006 China Green and Low-Carbon Innovation Center Nan’an SCNU Institute of Green and Low-Carbon Research Quanzhou362300 China Analysis and Test Center Guangdong University of Technology Guangzhou510006 China

The bioreduction characteristics and mechanisms of Cr(VI) onto Bacillus cereus RCr enhanced by ferric citrate were investigated. The optimum conditions were initial pH 9, temperature 40 °C, inoculation amount 4%, and glucose 3 g/L, respectively. The addition of 1.5 g/L ferric citrate increased the average reduction rate from 120.43 to 220.61 mg/(L∙h) compared with the control (without ferric citrate). The binding capacity of Cr(III) on the cell surface increased to 21%, in which the precipitates were mainly CrO(OH), Cr2O3, and FeCr2O4. Cell membrane was the main site of reduction, related important functional groups: − COOH, C-H, − NH2, C = C, and P-O. Fe(III) increased the yield of NADH and cytochrome c by approximately 48.51% and 68.63%, which significantly facilitated the electron generation and electron transfer, thus increasing the amount of electrons in the bioreduction of heavy metals by an average of 110%. Among the electrons obtained by Cr(VI), the proportion of indirect reduction mediated by Fe(III)/Fe(II) shuttle was 62% on average, whereas direct reduction mediated by reductase was 38%. These results may provide insights into the bioreduction process by bacteria enhanced by Fe(III) for detoxification of heavy metals with multiple valences, as an important step towards improving microbial remediation. Graphical abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Chromium compounds

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Application of LSTM in Metal Temperature Forecasting for a 1000 MW Double-Reheat Coal-Fired Boiler 7

Application of LSTM in Metal Temperature Forecasting for a 1...

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7th IEEE International Conference on Power and Renewable Energy, ICPRE 2022

作者： Ma, Qilei Zhong, Wenqi Chen, Xi Zhu, Hengyi Tan, Peng Li, Jianhua Zhang, Hui Southeast University Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Nanjing China Huazhong University of Science and Technology State Key Laboratory of Coal Combustion Wuhan China East China Electric Power Test and Research Institute China Datang Corporation Science and Technology Research Institute Hefei China

ISBN: (数字)9781665450638

ISBN: (纸本)9781665450638

Since more renewable energy is being incorporated into the electrical grid, coal-fired power units must operate flexibly rather than as base-load. Sharp changes in the reheat steam temperature during flexible operation of the secondary reheat units can cause thermal stress on the reheater, resulting in tube breakage or unplanned shutdown. To avoid the risk of this issue occurring, the operating temperature of the reheater should be precisely monitored in real time. A novel long short-term memory (LSTM) for predicting metal temperatures is developed using real operating data obtained from a 1000 MW doublereheat power plant boiler. The soot blower action signals are added for more accurate prediction. The results indicate that the LSTM has adequate accuracy. The root mean square error for the test dataset is 0.861 , the mean absolute percentage error is 0.105% and the Pearson correlation coefficient between the actual value and the predicted value is over 0.979. © 2022 IEEE.

关键词： Long short-term memory

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Multivariate Multiscale Sample Entropy for Multi-Channel underwater Acoustic Signal Analysis

Multivariate Multiscale Sample Entropy for Multi-Channel Und...

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IEEE Information technology, Networking, Electronic and Automation control Conference

作者： Jing Zhou Yaan Li Mingzhou Wang Lei Shi School of Marine Science and Technology Northwestern Polytechnical University Xi'an China National Key Laboratory of Underwater Information and Control Xi'an Precision Machinery Research Institute Xi'an China

ISBN: (数字)9798350370805

ISBN: (纸本)9798350370812

Multi-channel time series collected by arrays are prevalent in underwater acoustic signal processing and are crucial for uncovering the intrinsic characteristics of the observed system. This paper introduces the multivariate multiscale sample entropy (MMSE) to assess the complexity information in multi-channel underwater acoustic signals. Simulation analysis is employed to validate the effectiveness of the MMSE algorithm in extracting both within-channel and cross-channel information from multi-channel signals. Various types of simulated ship-radiated noise are generated to illustrate the MMSE algorithm's capability to differentiate between signals. Additionally, we employ MMSE to analyze various real-world signals, including ship-radiated noise, ambient noise, and interface reverberation. The MMSE results demonstrate its proficiency in differentiating various underwater acoustic signals compared to traditional frequency domain methods.

关键词： Heuristic algorithms Delay effects Noise Signal processing algorithms Feature extraction Entropy Classification algorithms Reverberation Data mining underwater acoustics

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Evolving LSTM Networks for Time-Series Classification in EdgeIoT

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Mathematical Problems in Engineering 2023年第1期2023卷

作者： Cui, Pei Li, San Jiang, Kaina Liu, Zhendong Sun, Xingkai Science and Technology on Underwater Test and Control Laboratory Dalian China Wuhan Maritime Communication Research Institute Wuhan China Dalian Institute of Measurement and Control Technology Dalian China Beijing Huahang Radio Measurement Institute Beijing China

We proposed a novel approach to evolve LSTM networks utilizing intelligent optimization algorithms and address time-series classification problems in EdgeIoT. Meanwhile, a new optimizer called cultural society and civilization (CSC) algorithm is proposed to reduce the probability of stagnated in the local optima and increase the convergence speed. The suggested method could relieve the problem that the traditional data mining and pattern extraction methods cannot guarantee high accuracy and are hard to deploy on terminal devices. The proposed CSC algorithm and CSC-optimized LSTM model is examined on benchmark problems and demonstrates remarkable superiority over traditional methods and can be applied to support EdgeIoT for learning and processing. © 2023 Pei Cui et al.

关键词： Data mining

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Reconstruction and Evaluation of Ship Radiated Noise Signal in Ocean Channel 4

Reconstruction and Evaluation of Ship Radiated Noise Signal ...

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4th Annual International Conference on Data science and Business Analytics, ICDSBA 2020

作者： Meng, Chun Xia Xia, Chun Yan Li, Xiao Yuan Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Scientific Test and Control Technology Institute Dalian China

ISBN: (纸本)9781728181646

Ship radiated noise can generally be regarded as a random process that undergoes steady states, but the complexity of its generation mechanism makes its spectral characteristics different from white noise signals. Realistic simulation of the time domain signal of ship radiated noise can improve performance of acoustic equipment. In this paper, the analysis methods of the ship's radiation noise line spectrum and continuous spectrum characteristics are studied. The near-field radiation noise data of a certain type of ship under the same operating conditions is analyzed in the time-frequency domain, and the statistically significant radiation noise spectrum characteristics are obtained. The probability density function is used to generate random numbers that meet this statistical characteristic to describe the frequency spectrum of underwater radiating sound sources at various frequencies, and the Fourier synthesis method is used to reconstruct the time-domain pass characteristic of the ship's radiated noise signal under arbitrary sound velocity conditions in shallow water. Finally, the evaluation method of the radiated noise signal modeling results is studied, and the reconstructed signal is evaluated by the similarity calculation between the measured and simulated signal. The results show that the reconstructed time domain signal has higher fidelity. © 2020 IEEE.

关键词： Random processes

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Full-Space Beam Scanning Antenna Based on Spoof Surface Plasmon Polaritons

Full-Space Beam Scanning Antenna Based on Spoof Surface Plas...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Zhicheng Wu Xianglin Kong Jun Wang Ruofeng Xu Lei Zhao Yinfang Xu School of Information and Control Engineering China University of Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

In this paper, a full-space beam scanning antenna based on spoof surface plasmon polaritons (SSPPs) is proposed. The proposed antenna is composed of a SSPPs loaded by the varactor diodes and periodic metallic patches. The periodic patches can transform the slow waves from SSPPs into fast waves, and the cutoff frequency can be reconfigured by changing the capacitance of the varactor diode, which will make the radiation angle of the beam change within a fixed frequency. Simulation results show that the radiation angle ranges from −90° to 90° at 9 GHz.

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Discrimination Between Broadband underwater Target Echo and Reverberation Based on Signal Spectral Flatness Feature

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Chinese Journal of Electronics 2019年第3期28卷 542-550页

作者： CHEN Yunfei LI Sheng JIA Bing ZHANG Yang WANG Zhenshan LI Guijuan School of Naval Architecture Dalian University of Technology Science and Technology on Underwater Test and Control Laboratory

Reverberation is the major interference of active detection, discrimination between target echo and reverberation is difficult when the reverberation is very strong. For the distinguishing of underwater target echo with strong interference, the modulation feature of echo and reverberation spectrum are characterized by signal spectral flatness measure, and the relationship between signal spectral flatness and target physical properties are theoretically formed. A method of discrimination between broadband underwater target echo and reverberation that based on signal spectral flatness characteristics difference is proposed and studied. Sea experiment results of complex underwater target broadband acoustic scattering have shown that signal spectral flatness characteristics of underwater target broadband echo and reverberation have obvious differences. Target echo and reverberation can be well distinguished using the proposed method.

关键词： Echo Reverberation Signal spectral flatness Benchmark

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Dual-Frequency Vortex Beam Generation Using Coding Metasurface

Dual-Frequency Vortex Beam Generation Using Coding Metasurfa...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Li, Junfeng Kong, Xianglin Wang, Fengjun Miao, Zhuowei Wang, Xiaoyi Shen, Xiaopeng Zhang, Shengjun Zhao, Lei China University of Mining and Technology School of Information and Control Engineering Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China Polytechnique Montreal Department of Electrical Engineering MontrealQC Canada China University of Mining and Technology School of Materials Science and Physics Xuzhou China

ISBN: (纸本)9781665452366

This paper presents a dual-frequency coding metasurface (CM) for vortex beam generation. The metasurface unit cell is realized with two symmetric metal layers separated by a dielectric substrate. Each metal layer consists of an outer square ring, a middle square ring, and an inner rhombus patch. Two out-of-phase transmitting states in two bands are achieved by rotating the inner rhombus patch by 90 °. Two 1 = + 2 vortex beams are then realized in two different bands by properly distributing the two states on the metasurface aperture. A metasurface with 30 × 30 elements is designed, simulated, and experimentally demonstrated. The experimental results agree well with the simulating ones, showing that the metasurface achieves a high transforming efficiency in both Ku (13.6-14.8GHz) band and Ka (26.7-27.7 GHz) band. © 2022 IEEE.

关键词： Kurchatovium

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Source-Configured Microwave Plasmonic Vortices Based on Single Meta-Particle

Source-Configured Microwave Plasmonic Vortices Based on Sing...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xianglin Kong Lei Zhao Xiaopeng Shen Yinfang Xu School of Information and Control Engineering School of Materials Science and Physics China University Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

In this paper, generation of plasmonic vortices with tunable topologic charges is proposed in the microwave regime. Tunable vortices with topologic charges of 0, +1 and -1 can be configured by illuminating incident plane waves with linearly polarization (LP), left-circularly polarization (LHCP) and right-circularly polarization (RHCP) on a single meta-particle, respectively. A spiral meta-particle operating at 2.94 GHz is designed, fabricated and measured to demonstrate the source-configured characteristics. The results showed that simulation and test are consistent with the theoretical ones.

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