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26th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2022

作者： Zhou, Yushan Cao, Yunqi Sepúlveda, Nelson Zhang, Hongjian State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Zhejiang Hangzhou310027 China Department of Electrical and Computer Engineering Michigan State University East LansingMI48824 United States

ISBN: (纸本)9781733419048

A lab-on-a-chip (LOC) thermal mass flow sensor based on microelectromechanical systems (MEMS) technology is designed, fabricated, and characterized. Vanadium dioxide (VO2), a nonlinear phase-change material with 3-order of change in resistance is placed in the down streaming direction of the heat source as the sensing element. The resistance of VO2 is monitored under gas flow rates ranging from 0 to 37.8 μL·s-1 with a maximum sensitivity of 368.56 ppm/(μL·min-1). The studies presented in this research may enable the application of utilizing nonlinear metamaterial in microfluidic LOC sensors with orders of magnitude improvement in sensitivity. © 2022 MicroTAS 2022 - 26th International Conference on Miniaturized Systems for Chemistry and Life Sciences. All rights reserved.

关键词： Phase change materials

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Chaotic index modulation and subcarrier intra-block-inter-block shuffling for secure CO-OFDM-PON based on a hybrid 4D chaos

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Optics Express 2025年第10期33卷 21217-21235页

作者： Wang, Yun Pan, Xiaolong Zhang, Qi Xin, Xiangjun Gao, Ran Yao, Haipeng Tian, Feng Wang, Fu Li, Zhipei Liu, Xiangyu Tian, Qinghua Wang, Yongjun Yang, Leijing Zhou, Sitong Li, Zuolin Li, Ying Beijing100876 China Beijing Key Laboratory of Space-round Interconnection and Convergence BUPT Beijing100876 China Beijing100081 China School of Information and Communication Engineering BUPT Beijing100876 China Beijing Institute of Control and Electronic Technology Beijing100038 China Beijing Institute of Remote Sensing Equipment Beijing100039 China

In this paper, a four-dimensional (4-D) encryption scheme with chaotic index modulation (IM) and subcarrier intra-block-inter-block shuffling is proposed to enhance the physical layer security of coherent orthogonal frequency division multiplexing passive optical network (CO-OFDM-PON). The scheme utilizes a hybrid 4-D chaotic scheme consisting of 1-D Cubic chaotic mapping and 3-D T-S Fuzzy chaotic system to generate four dynamic scrambling factors to achieve 4-D ultra-high security encryption of index bits, data bits, intra-subcarrier block, and inter-subcarrier block. Firstly, the chaotic many-to-many mapping rule between index bits and subcarrier activation patterns (SAPs) is constructed based on the IM principle to realize the index bit encryption;secondly, the data bit encryption is realized by heterodyning with chaotic bits. Further, the chaotic shuffling algorithm is proposed to disrupt and rearrange the symbols within and between subcarrier blocks to realize OFDM-IM symbol secondary encryption. To validate the feasibility of the proposed encryption scheme, simulations in a CO-OFDM-PON system evaluate the performance of a 63.76 Gb/s encrypted 16 quadrature amplitude modulation (QAM) OFDM-IM signal over transmission distances of 25 km and 80 km through standard single-mode fiber (SSMF). The results demonstrate that legitimate users can successfully recover the encrypted signals, while eavesdroppers consistently experience a bit error rate (BER) close to 0.5, making it nearly impossible to extract useful information. The initial value sensitive tolerance precision of the key (x0, y0, z0, w0, a1, b1, c1, a2, b2, c2, a3, b3, c3, µ) is (10−15, 10−15, 10−14, 10−16, 10−15, 10−14, 10−15, 10−14, 10−16, 10−16, 10−15, 10−15, 10−15, 10−15), and the key space is as high as 10210. The proposed scheme achieves the scrambling degree (SD) value of 100% under a different number of blocks, which demonstrates its exceptional security and suitability for secure communication appli

关键词： Quadrature amplitude modulation

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Reform of experimental teaching by integrating virtual simulation and remote control 23

Reform of experimental teaching by integrating virtual simul...

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8th International Conference on Distance Education and Learning, ICDEL 2023

作者： Hu, Wenhua He, Yuncheng Li, Jing Chen, Wei Wu, Ruiqin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China Research Center for Wind Engineering and Engineering Vibration Guangzhou University China Smart City College Beijing Union University China

ISBN: (纸本)9798400700422

Remote online experimental system is the inevitable trend of experimental teaching in the future. Compared with the traditional offline experimental mode, the online experimental system has better operability and more intuitive teaching significance. It can carry out experiments anytime and anywhere without many actual environmental restrictions, saving the time of teachers and students. The number of students in an online class is far more than the number of offline experiments, which can improve teachers' teaching efficiency and teaching quality. This paper will start from an experimental example, design the simulation system based on Automation Studio (AS) and build the actual system based on WS290 hydraulic experimental rig, and then design the image recognition remote control program, and let users achieve the purpose of experimental teaching and control through the program. © 2023 ACM.

关键词： Remote control

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Coupling effect of gas solubility in a solvent and substrate structure on performance in nanobubble morphological changes

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Journal of Molecular Liquids 2024年 414卷

作者： Wang, Chao Lu, Yan Tu, Fuquan Wang, Qiongyao Zhang, Aoxiang Wu, Jicheng Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science and Technology Wuhan430081 China Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Research Institute Wuhan University of Science and Technology Wuhan430081 China

The distribution morphologies of nanobubbles on Highly Oriented Pyrolytic Graphite (HOPG) surfaces prepared using the alcohol-water exchange test method were observed using atomic force microscopy. In situ observation revealed the distinct growth evolution behavior of nanobubble morphology. Molecular dynamics simulation was employed to replicate the experimental test and investigate the influence of the coupling effect of gas solubility and substrate structure on the morphological features of nanobubble distribution in alcohol-water exchange experiments. The results demonstrate that gas solubility plays a pivotal role in the nucleation of surface nanobubbles during alcohol-water exchange. Specifically, stable surface nanobubbles form only when the solubility exceeds 0.02535. Furthermore, under conditions where gas solubility satisfies the nucleation criteria, the surface potential energy of concave and defective structures exhibits concave characteristics, giving rise to the nucleation of cap-shaped nanobubbles. In contrast, the step structure, characterized by the smallest average surface potential energy, results in relatively flat properties in the lowest area, with nanobubble nucleation taking the form of layer-shaped features. yields relatively uniform characteristics at the lowest level, where nanobubble nucleation manifests in the form of layered features. As time progresses, cap-shaped nanobubbles coalesce, leading to the escape of gas molecules and subsequent dissipation, whereas the layer-shaped nanobubbles adsorb gas molecules from the solution, prompting their expansion. © 2024 Elsevier B.V.

关键词： Nucleation

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Shear-accelerated crystallization of glass-forming metallic liquids in high-pressure die casting

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Journal of Materials Science & technology 2022年第22期117卷 146-157页

作者： L.H.Liu W.J.Gao X.S.Huang T.Zhang Z.Y.Liu C.Yang W.W.Zhang W.R.Li L.Li P.J.Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou510640China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Institute of Eontech New Materials Co. Ltd.Dongguan523662China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China

As one of the most important forming technologies for industrial bulk metallic glass (BMG) parts withcomplex shapes, high-pressure die casting (HPDC) can fill a die cavity with a glass-forming metallic liquidin milliseconds. However, to our knowledge, the correlation between flow and crystallization behavior inthe HPDC process has never been established. In this study, we report on the solidification behavior ofZr_(55)Cu_(30)Ni_(5)Al_(10) glass forming liquid under various flow rates. Surprisingly, the resulting alloys display adecreasing content of amorphous phase with increase of flow rate, i.e. increase of cooling rate, suggestingthat crystallization kinetics of glass-forming metallic liquids in the HPDC process is strongly dependenton the flow field. Analysis reveals that the accelerated crystallization behavior is mainly ascribed to therapid increase in viscosity with a decreasing temperature as well as to the huge shear effect in the glassforming liquid at the end stage of the filling process when the temperature is close to the glass-transitionpoint;this results in a transition from diffusion- to advection-dominated transport. The current investigation suggests that flow-related crystallization must be considered to assess the intrinsic glass-formingability of BMGs produced via HPDC. The obtained results will not only improve the understanding ofcrystallization dynamics but also promote the high-quality production and large-scale application of BMGparts.

关键词： Crystallization Shear Supercooled liquid High pressure die casting

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Human-Mechanical Biomechanical Analysis of a Novel Knee Exoskeleton Robot for Rehabilitation Training

Human-Mechanical Biomechanical Analysis of a Novel Knee Exos...

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International Conference on Applied Nonlinear Dynamics, Vibration, and control, ICANDVC 2023

作者： Yan, Mengmeng Gao, Guanbin Chen, Xin Xing, Yashan Lu, Sheng Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming650500 China Yunnan International Joint Laboratory of Intelligent Control and Application of Advanced Equipment Kunming650500 China The First People’s Hospital of Yunnan Province Kunming650034 China Yunnan Key Laboratory of Digital Orthopedics Kunming650034 China

ISBN: (纸本)9789819705535

Exoskeleton robots are a new kind of wearable assistive and rehabilitation training equipment, with user adaptability and assistive effectiveness being important performance indicators. To improve the comfort of wearers and the effectiveness of rehabilitation training, this paper designs a knee rehabilitation training exoskeleton robot and analyzes its performance. Firstly, the exoskeleton robot is designed to reduce the lower limb movement load by placing the power source and motors at the wearer’s waist, and transmitting power to the knee through Bowden cables. A three-dimensional model of the exoskeleton robot is established. Secondly, a human-exoskeleton robot biomechanical simulation environment is constructed, including scenarios of the human body alone, the human body wearing a passive exoskeleton, and the human body wearing an active exoskeleton. Biomechanical simulations of the human-exoskeleton interactions are conducted in these three scenarios. The results show that the designed exoskeleton does not significantly impede human movement. When wearing the exoskeleton, the force and torque of the knees during squatting exercises are significantly reduced, and the muscle force and muscle activation of the quadriceps and gluteus maximus are significantly decreased, while the impact on the calf muscles is minimal. This verifies the good user adaptability and assistive effectiveness of the designed exoskeleton. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Cables

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Research on DOA Estimation Method of Vector Hydrophone Array in Low SNR Based on CNN

Research on DOA Estimation Method of Vector Hydrophone Array...

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International Youth Conference on Radio Electronics, Electrical and Power engineering (REEPE)

作者： Nan Zou Yueming Li Jin Fu Guangpu Zang Zhiyao Du Yanhe Li National Key Laboratory of Underwater Acoustic Technology Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information Technology College of Underwater Acoustic Engineering Harbin Engineering University Harbin China College of Underwater Acoustic Engineering School of Electronic and Information EngineeringBeihang University Beijing China

ISBN: (数字)9798331531836

ISBN: (纸本)9798331531843

This paper presents a direction of arrival (DOA) estimation method for vector sensor arrays based on convolutional neural networks (CNN) to improve the estimation accuracy. The model consists of four convolutional layers and three fully connected layers. The network input is a three-channel data consisting of real part, imaginary part, and phase from the signal covariance matrix received by the array. Each node of the output stands for a presented directional grid, and the output value on that node indicates the probability of a signal locating in the neighborhood of the grid. The experimental results show that the neural network model can achieve 360-degree unambiguous estimation and is capable of acquiring precise and accurate estimation of DOA, especially in the cases of low signal-to-noise ratio (SNR).

关键词： Direction-of-arrival estimation Accuracy Azimuth Array signal processing Estimation Feature extraction Vectors Convolutional neural networks Signal to noise ratio Hydrophones

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Antifungal properties and mechanisms of three volatile aldehydes(octanal,nonanal and decanal)on Aspergillus flavus

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Grain & Oil Science and technology 2021年第3期4卷 131-140页

作者： Qian Li Xiaoman Zhu Yanli Xie Jingmeng Liang Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control College of Food Science and EngineeringHenan University of TechnologyZhengzhou 450001China

The harmof Aspergillus flavus(***)and aflatoxin is a severe food safety problemworldwide,which causes huge economic losses every ***,it is urgent to control the growth of *** and the biosynthesis of ***-derived natural compounds are superior to synthetic fungicide in inhibiting the growth of *** benefiting from their high safety to the environment,humans and stock,and low *** study aimed to evaluate the antifungal effects and potential antifungal mechanisms of three plant-derived compounds(octanal,nonanal and decanal)against *** determined the minimum inhibitory concentrations(MICs)and action mechanism of the three volatile aldehydes on *** and also performed calcofluor white(CW)staining for visualizing the distribution of *** respiration metabolism and the pathogenicity on maize kernels were also carried out to evaluate the efficacy of the three volatile aldehydes on the growth of *** results showed that the three volatile aldehydes could inhibit the germination of spores and mycelial growth of ***,the MICs on spores and mycelia were:octanal(1.0 and 0.5μL/mL),nonanal(0.5 and 2.0μL/mL),and decanal(1 and 5μL/mL).The three volatile aldehydes could strongly damage the integrity of both the cell wall and the cell membrane of ***,they could decrease the content of total lipid and inhibit respiration metabolism of *** *** of in vitro antifungal test showed that all the three volatile aldehydes could effectively prevent the growth of *** on maize *** study revealed that octanal,nonanal and decanal could effectively inhibit the growth of *** both in culture medium and on maize kernels to different *** results confirmed that the plant-derived compounds could be developed into promising antifungal agents applied in the preservation of *** study provides a theoretical basis for the research and application of potential antifungal agents.

关键词： Aspergillus flavus Octanal Nonanal Decanal Antifungal mechanism

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Resource Allocation for Coupled Slices in Edge-Assisted Industrial IoT Systems

Resource Allocation for Coupled Slices in Edge-Assisted Indu...

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2023 IEEE/CIC International Conference on Communications in China, ICCC 2023

作者： Wen, Xiaojing Chen, Cailian Ren, Cheng Lyu, Ling Guan, Xinping Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Engineering Research Center of Intelligent Control and Management Department of Automation Shanghai200240 China Dalian Maritime University School of Information Science and Technology Dalian116026 China

ISBN: (纸本)9798350345384

Multiple types of sensors are utilized for remote monitoring of single industrial process to compensate for the limited accuracy of a single type of sensor. Network slicing technology is considered promising for collecting data from heterogeneous sensors and meeting diverse Quality of Service (QoS) requirements. However, existing research on network slicing optimization mainly focuses on inter-slice resource constraints based on slice heterogeneity, neglecting slice coupling feature. In this regard, this paper proposes a novel network slicing framework for edge-assisted industrial IoT systems. The framework includes a slice coupling model and network resource allocation (transmission and computing) to address the problem of improving estimation performance while ensuring system convergence. The slice coupling model is primarily composed of the estimation error covariance of two slices, calculated using the Age of Task (AoT) as a bridge, which reflects the accuracy and freshness of the estimation. To reduce the complexity of the direct solution, the optimization problem is scaled down and decoupled. The iterative Particle Swarm Optimization (PSO) algorithm is proposed to determine the allocation rates of inter-slice transmission and computing resources. Simulation results demonstrate that the proposed algorithm achieves a flexible balance under heterogeneous estimation weights and exhibits near-optimal performance. © 2023 IEEE.

关键词： Resource allocation

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Synchronous vanadium bio-reduction/detoxification/recovery and nitrogen attenuation in a membrane aerated biofilm reactor

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Environmental Pollution 2025年 372卷 126095页

作者： Sun, Zhiye Li, Baoan Liu, Jun School of Environmental and Chemical Engineering Heilongjiang University of Science and Technology Harbin150022 China Carbon Neutrality Interdisciplinary Science Centre Tianjin Key Laboratory of Environmental Technology for Complex Trans-media Pollution College of Environmental Science and Engineering Nankai University Tianjin300350 China State Key Laboratory of Marine Resource Utilization in South China Sea School of Marine Science and Engineering Hainan University Hainan Haikou570228 China

The presence of both pentavalent vanadium [V(Ⅴ)] and nitrogen in wastewaters from vanadium smelting poses significant environmental challenges. However, it remains little in the way of continuous flow biological reactor to concurrently eliminated V(Ⅴ) and nitrogen in wastewaters. Herein, membrane-aerated biofilm reactor (MABR) system was designed to achieve simultaneous nitrification and denitrification (SND) alongside biological reduction, detoxification, and recovery of vanadium. Vanadium and nitrogen removal performances, solid-state characterization, microbial compositions and functional genes, and the mechanism related to the metabolism of vanadium and nitrogen were illuminated. Notably, we identified a potential role for biofilm-derived "secretion" in the transformation of V(Ⅴ) and nitrogen. Our findings revealed that the system achieved SND efficiency of 98.00 ± 0.57 % and removed 91.10 ± 3.60 % of total vanadium (TV) even at high influent V(Ⅴ) concentrations in continuous flow stage. Batch experiments implied that the conversion of NH4+-N was the limiting process of nitrogen removal in MABR system, and the extracellular polymeric substances (EPS) might play an important role in the conversion of V(Ⅴ) and nitrogen. V(Ⅴ) was reduced to V(Ⅳ), which was immobilized to biofilm and "secretion" by microbial surface functional groups, including C-O, O-C=O and -OH. Acinetobacter, Dechlorobacter, Denitratisoma and Nitrospira were verified as microbes associated with V(Ⅴ) and nitrogen metabolism. The abundance of functional genes pertaining to electron donor, electron transport, and electron acceptor systems increased under high V(V) stimulation. Collectively, the cooperation of biofilm and "secretion" ensured the intensive removal of vanadium and nitrogen. This study provides new insights into the concurrent removal of heavy metal and environmental nutrient. © 2025

关键词： Biofilms

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