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High-resolution recognition of FOAM modes via an improved EfficientNet V2 based convolutional neural network

Frontiers of physics 2024年第3期19卷 175-183页

作者： Youzhi Shi Zuhai Ma Hongyu Chen Yougang Ke Yu Chen Xinxing Zhou International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and ApplicationsSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communications School of Information Science and EngineeringHunan Institute of Science and TechnologyYueyang 414006China

Vortex beam with fractional orbital angular momentum (FOAM) is the excellent candidate for improving the capacity of free-space optical (FSO) communication system due to its infinite modes. Therefore, the recognition of FOAM modes with higher resolution is always of great concern. In this work, through an improved EfficientNetV2 based convolutional neural network (CNN), we experimentally achieve the implementation of the recognition of FOAM modes with a resolution as high as 0.001. To the best of our knowledge, it is the first time this high resolution has been achieved. Under the strong atmospheric turbulence (AT) (C_(n)^(2)=10^(-15)m^(-2/3)), the recognition accuracy of FOAM modes at 0.1 and 0.01 resolution with our model is up to 99.12% and 92.24% for a long transmission distance of 2000 m. Even for the resolution at 0.001, the recognition accuracy can still remain at 78.77%. This work provides an effective method for the recognition of FOAM modes, which may largely improve the channel capacity of the free-space optical communication.

关键词： OAM free-space optical communication deep learning convolutional neural network

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Adaptive Twisting Sliding Mode control for Overhead Cranes

Adaptive Twisting Sliding Mode Control for Overhead Cranes

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IEEE International Conference on Cyber technology in Automation, control, and Intelligent Systems

作者： Weimin Xu Yue Xu Xiang Zheng Key Laboratory of Marine Technology and Control Engineering Ministry of Communications of P. R. China Shanghai Maritime University

ISBN: (纸本)9781479987313

This paper analyzes the model of overhead cranes suffering from uncertain disturbances, then an adaptive twisting sliding mode control scheme for the underactuated overhead cranes with uncertainties is proposed. This method improves the robustness of the crane system by employing a time-varying sliding mode surface. Moreover, self-tuning laws for the twisting controller are developed to resist unknown disturbances exerted on the overhead crane systems. None of the prior information about the upper boundary of uncertainties is required in controller design. The finite time stability of the proposed controller is proven. Simulation study shows the performance of the suggested method.

关键词： Overhead crane Time-varying sliding mode Twisting sliding mode Adaptive control Uncertainties CRANE BRIDGE adaptive control Uncertainty Twisting torsion Variable structure systems time stability upper boundary controllers Cranes

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Corrigendum to "Physiological energetics of selectively bred oysters (Crassostrea hongkongensis) under marine heatwaves" [Mar. Environ. Res. 204 (2025) 106871]

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marine environmental research 2025年 204卷 106903页

作者： Xiaoyan Jiang Xingzhi Zhang Junliang Guan Pingping He Pingyuan Wei Li Zhang Jinxia Peng Liqiang Zhao China (Guangxi)-ASEAN Key Laboratory of Comprehensive Exploitation and Utilization of Aquatic Germplasm Resources Ministry of Agriculture and Rural Affairs Guangxi Academy of Fishery Sciences Nanning China Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture Fishery College Guangdong Ocean University Zhanjiang China. Beibu Gulf Marine Ecological Environment Field Observation and Research Station of Guangxi Marine Environmental Monitoring Centre of Guangxi Beihai China. Beibu Gulf Marine Ecological Environment Field Observation and Research Station of Guangxi Marine Environmental Monitoring Centre of Guangxi Beihai China. Electronic address: pengjinxia@***. Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture Fishery College Guangdong Ocean University Zhanjiang China Oyster Industrial Technology Institute of Zhanjiang Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) Zhanjiang China. Electronic address: lzhao@***.

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Adsorption properties graphene-based composites on lead(Ii) ions 2nd

Adsorption properties graphene-based composites on lead(Ii) ...

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2nd Conference on Research and Application of Advanced Cementitious Materials and Advanced Materials Forum, CRAACM and AMF 2020

作者： Sheng, Zhibo Wang, Chenkang Wu, Lingzheng Jin, Wenliang Jin, Shenyou Song Key Laboratory of Durability Technology for Harbor and Marine Structure Ministry of Communications Guangzhou510230 China School of Civil Engineering Dalian University of Technology Dalian116024 China Shenzhen-Zhongshan Link Administration Center Zhongshan528400 China

ISBN: (纸本)9783035718119

The graphene-based composites was prepared by the oxidation of graphene nano-platelets. The characterization results of thermogravimetric analysis (TGA) and Fourier transform infrared spectrum (FT-IR) indicated that acid treatment can generate abundant functional groups on the surface of graphene. The determined equilibrium adsorption capacity of FGN for lead was 57.765 mg/g, which is higher than that of many currently reports. The adsorption process was completed within 40 min and the adsorption isotherms confirmed to Langmuir classical isotherms models. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Adsorption

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Deciphering decadal urban ozone trends from historical records since 1980

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National Science Review 2024年第11期11卷 117-129页

作者： Haolin Wang Xiao Lu Paul I.Palmer Lin Zhang Keding Lu Ke Li Tatsuya Nagashima Ja-Ho Koo Hiroshi Tanimoto Haichao Wang Meng Gao Cheng He Kai Wu Shaojia Fan Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen University and Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Geo Sciences University of Edinburgh National Centre for Earth Observation University of Edinburgh Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University State Key Joint Laboratory of Environmental Simulation and Pollution Control The State Environmental Protection Key Laboratory of Atmospheric Ozone Pollution ControlCollege of Environmental Sciences and Engineering Peking University Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science &Technology National Institute for Environmental Studies Department of Atmospheric Sciences Yonsei University Department of Geography Hong Kong Baptist University Department of Civil and Environmental Engineering University of California

Ozone pollution is a major environmental threat to human health. Timely assessment of ozone trends is crucial for informing environmental policy. Here we show that for the most recent decade（2013–2022） in the northern hemisphere, warm-season（April–September） mean daily 8-h average maximum ozone increases much faster in urban regions with top ozone levels(mainly in the North China Plain, 1.2 ± 1.3 ppbv year-1) than in other, low-ozone regions(0.2 ± 0.9 ppbv year-1). These trends widen the ozone differences across urban regions, and increase extreme pollution levels and health threats from a global perspective. Comparison of historical trends in different urban regions reveals that ozone increases in China during 2013–2022 differ in magnitude and mechanisms to historical periods in other regions since *** reflects a unique chemical environment characterized by exceptionally high nitrogen oxides and aerosol concentrations, where reducing ozone precursor emissions leads to substantial ozone *** increase in China has slowed down in 2018–2022 compared to 2013–2017, driven by ongoing emission reductions, but with ozone-favorable weather conditions. Historical ozone evolution in Japan and South Korea indicates that ozone increases should be suppressed with continuous emission *** temperature and associated wildfires have also reversed ozone decreases in the USA and Europe,with anthropogenic ozone control slowing down in recent decades.

关键词： air quality surface ozone trends

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Uptake, Distribution, and Transformation of CuO NPs in a Floating Plant Eichhornia crassipes and Related Stomatal Responses

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ENVIRONMENTAL SCIENCE & technology 2017年第13期51卷 7686-7695页

作者： Zhao, Jian Ren, Wenting Dai, Yanhui Liu, Lijiao Wang, Zhenyu Yu, Xiaoyu Zhang, Junzhe Wang, Xiangke Xing, Baoshan College of Environmental Science and Engineering and Ministry of Education Key Laboratory of Marine Environment and Ecology Ocean University of China Qingdao 266100 China. Institute of Environmental Processes and Pollution Control and School of Environmental and Civil Engineering Jiangnan University Wuxi 214122 China. Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China. School of Environment and Chemical Engineering North China Electric Power University Beijing 102206 China. Stockbridge School of Agriculture University of Massachusetts Amherst Massachusetts 01003 United States.

Engineered nanoparticles (NPs) are being released into aquatic environments with their increasing applications. In this work, we investigated the interaction of CuO NPs with a floating plant, water hyacinth (Eichhornia crassipes). CuO NPs (SO mg/L) showed significant growth inhibition on both roots and shoots of E. crassipes after 8-day exposure, much higher than that of the bulk CuO particles (50 niga) and their corresponding dissolved Cu2+ ions (0.30 mg/L). Scanning electron and light microscopic observations showed that the root caps and meristematic zone of E. Crassipes were severely damaged after CuO NP exposure, with disordered cell arrangement and a destroyed elongation zone Of root tips. It is confirmed that CuO NPs could be translocated to shoot from both roots and submerged leaves. As detected by X-ray absorption near-edge spectroscopy analysis (XANES), CuO NPs were Observed in toots, submerged leaves, and emerged leaves. Cu2S and other Cu, species were also detected in these tissues, providing solid,evidence of the transformation of CuO NPs. In addition, stomatal closure was observed during, CuO NPs-leaf contact, which was induced by the :production of H2O2 and increased Ca level in leaf guard cells. These findings are helpful for better understanding the fate of NPs in aquatic plants and related biological respones.

关键词： Plants X-ray absorption near edge spectroscopy Ions Transmission electron microscopy Toxicity

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Design and implementation of integrated monitoring and diagnosis system for marine diesel engine

Lecture Notes in Mechanical Engineering

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Lecture Notes in Mechanical engineering 2015年 19卷 647-659页

作者： Hu, Nao Yang, Jianguo Yu, Yonghua School of Energy and Power Engineering Key Laboratory of Marine Power Engineering and Technology Ministry of Communications Wuhan University of Technology Wuhan430063 China

marine diesel engine is the main power source of ship. Its safety and reliability can be improved by monitoring and diagnosing engine’s running status. A kind of Integrated multi-method multi-parameter Monitoring and Diagnosis (IMD) system for marine diesel engine is presented in the paper for the purpose of meeting the application in real ship environment. Test and information technology are fully reflected in the design of IMD system which can monitor the running status and diagnose a variety of common faults of marine diesel engine. IMD system contains six sub-monitoring systems which are Thermal Parameter Monitoring (TPM) system, Instantaneous Speed Monitoring (ISM) system, Cylinder Pressure Monitoring (CPM) system, Shaft Power Monitoring (SPM) system, Valve Leakage Monitoring (VLM) system and Piston Ring Monitoring (PRM) system. © Springer International Publishing Switzerland 2015

关键词： Ships

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Effects of large process structure of cylinder liner on friction of cylinder liner-piston ring

Effects of large process structure of cylinder liner on fric...

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Prognostics and System Health Management Conference (PHM)

作者： Peng Liu Chengqing Yuan Zhiwei Guo Key Laboratory of Marine Power Engineering & Technology (Ministry of Communications) Wuhan University of Technology Wuhan China

Cylinder liner-piston ring is one of the most important rubbing pairs in diesel engines. Its normal operation ensures the high performance of the whole engine system. Previous researches have shown that the process of liner has a great impact on the friction characteristics of cylinder liner-piston ring. Large scale pits and slots in dimension at the liner inner surface were processed and the experiments were conducted on the test rig to investigate the influence of this procedure on the friction characteristics of cylinder liner-piston ring under different engine rotation speeds in this study. By the use of oil analysis and vibration analysis, the friction information of cylinder liner-piston ring assembly was obtained and the lubrication mechanism of the test was analyzed. Experimental results show that implementing proper process of large pits and slots on the inner surface of the piston liner could improve the friction performance of the cylinder liner-piston ring at high engine rotation speed.

关键词： Optical filters Geometrical optics Optical films Atom optics Belts Friction Lubricating oils

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Online Learning-Based Offloading Decision and Resource Allocation in Mobile Edge Computing-Enabled Satellite-Terrestrial Networks

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China communications 2024年第3期21卷 230-246页

作者： Tong Minglei Li Song Han Wanjiang Wang Xiaoxiang School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and TelecommunicationsBeijing 100876China

Mobile edge computing(MEC)-enabled satellite-terrestrial networks(STNs)can provide Internet of Things(IoT)devices with global computing ***,the network state information is uncertain or *** deal with this situation,we investigate online learning-based offloading decision and resource allocation in MEC-enabled STNs in this *** problem of minimizing the average sum task completion delay of all IoT devices over all time periods is *** decompose this optimization problem into a task offloading decision problem and a computing resource allocation problem.A joint optimization scheme of offloading decision and resource allocation is then proposed,which consists of a task offloading decision algorithm based on the devices cooperation aided upper confidence bound(UCB)algorithm and a computing resource allocation algorithm based on the Lagrange multiplier *** results validate that the proposed scheme performs better than other baseline schemes.

关键词： computing resource allocation mobile edge computing satellite-terrestrial networks task offloading decision

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Research on Slope Stability Analysis Method Based on Limit State Design Method of Partial Coefficient

Research on Slope Stability Analysis Method Based on Limit S...

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2018 International Conference on Civil and Hydraulic engineering, IConCHE 2018

作者： Li, Bin China Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam Ministry of Water Resources Nanjing210029 China TianjinPort Engineering Institute Ltd. CCCC First Harbor Engineering Company Ltd. Tianjin30222 China Key Laboratory of Port Geotechnical Engineering Ministry of Communications Tianjin30222 China Key Laboratory of Port Geotechnical Engineering of Tianjin Tianjin30222 China Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering Guilin University of Technology Guilin541000 China

The arch dam design specification (SL282-2003) provides an allowable safety factor of 3.5 in abutment stability analysis, whether at the same safety level with value of 3.0 specified for gravity dams. The approach of 'Ratio of Safety Margin' can compare the safety factor with reliability index. The researches confirm that allowable reliability index of 4.45 and the allowable safety factor of 3.5 at the same level of risk control. © Published under licence by IOP Publishing Ltd.

关键词： Safety factor

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