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Wireless multisite sensing sy.tems for continuous phy.iological monitoring

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Science China Materials 2024年第6期67卷 2045-2047页

作者： Ruilai wei Qilin Hua Guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Respiratory.diseases rank as the third leading cause of adult mortality.1],while cardiopulmonary.and gastrointestinal issues are the primary.cause of death within the first five y.ars of a child’s life[2].The monitoring of cardiac,respiratory.and gastrointestinal sounds play. a vital role in routine care,as alterations or absence of these body.sounds can serve as indicators of underly.ng diseases.

关键词： routine continuous monitoring

Novel Adaptive Memory.Event-Triggered-Based Fuzzy.Robust Control for Nonlinear Networked Sy.tems via the Differential Evolution Algorithm

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1836-1848页

作者： wei Qian y.nmin Wu Bo shen School of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo 454000China College of Information Science and Technology Donghua UniversityShanghai 201620China

This article mainly.investigates the fuzzy.optimization robust control issue for nonlinear networked sy.tems characterized by.the interval ty.e-2(IT2)fuzzy.technique under a differential evolution *** provide a more reasonable utilization of the constrained communication channel,a novel adaptive memory.event-triggered(AMET)mechanism is developed,where two event-triggered thresholds can be dy.amically.adjusted in the light of the current sy.tem information and the transmitted historical *** conditions with less conservative design of the fuzzy.imperfect premise matching(IPM)controller are presented by.introducing the Wirtinger-based integral inequality.the information of membership functions(MFs)and slack ***,under the IPM policy.a new MFs intelligent optimization technique that takes advantage of the differential evolution algorithm is first provided for IT2 TakagiSugeno(T-S)fuzzy.sy.tems to update the fuzzy.controller MFs in real-time and achieve a better sy.tem control ***,simulation results demonstrate that the proposed control scheme can obtain better sy.tem performance in the case of using fewer communication resources.

关键词： Adaptive memory.event-triggered(AMET) differential evolution algorithm fuzzy.optimization robust control interval ty.e-2(IT2)fuzzy.technique.

Auto-parametric resonance of a continuous-beam-bridge model under two-point periodic excitation:an experimental investigation and stability.analy.is

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 445-454页

作者： Li y.chun shen Chao Liu wei Li Dong Department of Hy.raulic Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

The auto-parametric resonance of a continuous-beam bridge model subjected to a two-point periodic excitation is experimentally.and numerically.investigated in this *** auto-parametric resonance experiment of the test model is conducted to observe and measure the auto-parametric resonance of a continuous beam under a two-point excitation on *** parametric vibration equation is established for the test model using the finite-element *** auto-parametric resonance stability.of the structure is analy.ed by.using Newmark's method and the energy.growth exponent *** effects of the phase difference of the two-point excitation on the stability.boundaries of auto-parametric resonance are studied for the test *** with the experiment,the numerical instability.predictions of auto-parametric resonance are consistent with the test phenomena,and the numerical stability.boundaries of auto-parametric resonance agree with the experimental *** a continuous beam bridge,when the ratio of multipoint excitation frequency.applied to the columns)to natural frequency.of the continuous girder is approximately.equal to 2,the continuous beam may.undergo a strong auto-parametric *** with the present experiment and analy.is,a hy.othesis of Volgograd Bridge's serpentine vibration is discussed.

关键词： auto-parametric resonance continuous beam bridge model two-point excitation experimental investigation stability.analy.is vibration of Volgograd Bridge

Transient Stability.Analy.is and Design of VSGs with Different DC-Link Voltage Controllers

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CSEE Journal of Power and Energy.Sy.tems 2024年第2期10卷 593-604页

作者： Chao shen wei Gu Wanxing sheng Key.n Liu School of Electrical Engineering Southeast UniversityNanjingChina Power Distribution Research Department China Electric Power Research InstituteBeijing 100192China

Virtual sy.chronous control has been widely.studied for the advantages of emulating inertia for voltage source converters (VSCs). A constant dc-link voltage is usually.assumed in existing literature to estimate transient stability.of virtual sy.chronous generators (VSGs). However, actual power supply.in the dc-side of VSGs is limited and different dc-link voltage controllers are needed to achieve power balance between DC side and AC side. Addition of dc-link voltage controller has great influence on transient behavior of VSGs, which has not been investigated by.previous research. To fill this gap, this paper gives insights into the effect of dc-link voltage dy.amics on transient stability.of VSGs. First, two ty.ical kinds of VSGs with dc-link voltage controllers are introduced. Then, mathematical models considering dc-link dy.amics are established and the effect of dc-link voltage controllers on transient sy.chronization stability.of VSGs is revealed through equal area criterion (EAC). It is found that dc-link voltage controller would reduce stability.margin of VSGs and design-oriented transient stability.analy.is is carried out quantitively.using critical clearing time (CCT). Finally. simulation results are given to validate correctness of theoretical analy.is.

关键词： DC-link voltage dy.amics equal area criterion(eac) transient sy.chronization stability virtual sy.chronous generator(VSG)

Coupled simulation of fluid-particle interaction for large complex granules:A resolved CFD-DEM method for modelling the airflow in a vertical fixed bed of irregular sinter particles

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Particuology 2024年第7期90卷 292-306页

作者： Chengzhi Li y. Zhang Jiahe shen wei Zhang The State Key.Laboratory.of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Key.Laboratory.for Ferrous Metallurgy.and Resources Utilization of Ministry.of Education Wuhan University of Science and TechnologyWuhan 430081China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430063China Centre for Bulk Solids and Particulate Technologies The University of NewcastleCallaghan NSW 2308Australia

A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex *** airflow in a vertical sinter fixed bed is numerically.studied using this *** multi-sphere clumped method is used to create irregular sinter particles in *** immersed boundary.method and dy.amic cell refinement are applied to describe the fluid flow around particles with higher resolution,by.which the fluid-particle interaction can be simulated more *** simulation results presented the packing voidage distributions and the airflow fields in the sinter beds of different single and mixed particle size *** bed pressure drops were simulated and the results were compared with the corresponding experimental *** good agreement indicated that the proposed resolved CFD-DEM method is an effective tool to model the fluid-particle interaction for irregular large granules in the gas-solid multi-phase sy.tems.

关键词： Resolved CFD-DEM method Irregular sinter particles Multi-sphere clumped method Immersed boundary.method Dy.amic cell refinement

Fabrication and integration of photonic devices for phase-change memory.and neuromorphic computing

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International Journal of Extreme Manufacturing 2024年第2期6卷 2-27页

作者： Wen Zhou Xuey.ng shen Xiaolong y.ng Jiangjing Wang wei Zhang Center for Alloy.Innovation and Design(CAID) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

In the past decade,there has been tremendous progress in integrating chalcogenide phase-change materials(PCMs)on the silicon photonic platform for non-volatile memory.to neuromorphic in-memory.computing *** particular,these non von Neumann computational elements and sy.tems benefit from mass manufacturing of silicon photonic integrated circuits(PICs)on 8-inch wafers using a 130 nm complementary.metal-oxide semiconductor *** manufacturing based on deep-ultraviolet lithography.and electron-beam lithography.enables rapid prototy.ing of PICs,which can be integrated with high-quality.PCMs based on the wafer-scale sputtering technique as a back-end-of-line *** this article,we present an overview of recent advances in waveguide integrated PCM memory.cells,functional devices,and neuromorphic sy.tems,with an emphasis on fabrication and integration processes to attain state-of-the-art device *** a short overview of PCM based photonic devices,we discuss the materials properties of the functional lay.r as well as the progress on the light guiding lay.r,namely.the silicon and germanium waveguide ***,we discuss the cleanroom fabrication flow of waveguide devices integrated with thin films and nanowires,silicon waveguides and plasmonic microheaters for the electrothermal switching of PCMs and mixed-mode ***,the fabrication of photonic and photonic–electronic neuromorphic computing sy.tems is *** sy.tems consist of array. of PCM memory.elements for associative learning,matrix-vector multiplication,and pattern *** large-scale integration,the neuromorphic photonic computing paradigm holds the promise to outperform digital electronic accelerators by.taking the advantages of ultra-high bandwidth,high speed,and energy.efficient operation in running machine learning algorithms.

关键词： nanofabrication silicon photonics phase-change materials non-volatile photonic memory neuromorphic photonic computing

A Low Cost, Green Sustainable and Biodegradable Biomass-based Fluorine-free Water and Oil Repellent

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Chinese Journal of Poly.er Science 2024年第4期42卷 480-491页

作者： Zhi-wei shen Shu-Feng Hu Chen Zeng wei-Qing Kong Mei-Fang Zhu State Key.Laboratory.for Modification of Chemical Fibers&Poly.er Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China State Key.Laboratory.of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510630China

With the global ban on plastics intensify.ng, the substitution of plastic with paper has garnered increasing attention. However, the inadequate water and oil repellency.of pulp molding hinders its practical applications. Currently. the common method to enhance the oil and water repellency.of pulp molding is by.adding fluorinated water and oil repellents. Nevertheless, fluorinated compounds are environmentally.and phy.iologically.harmful. Therefore, the development of fluorine-free, water and oil repellent alternatives is crucial. In this study. chitosan and stearic acid were utilized as the first and second lay.rs of the oil and water repellent coatings, respectively. The coated samples exhibited favorable water repellency. with a water contact angle of 116.4°, and excellent oil repellency. achieving a 12/12 rating on the kit scale. Importantly. the samples did not exhibit any.leakage after being soaked in hot water and hot oil at 95±5℃ for 30 min, demonstrating remarkable performance as a barrier against hot water and oil. Moreover, the coated samples display.d outstanding mechanical properties, thermal stability. biodegradability. and recy.lability. The approach presented in this study.is simple, cost-effective, environmentally.friendly. and represents a promising technique for producing fluoride-free, oil-and water-resistant pulp molding products.

关键词： Biomass Fluoride-free Oil-andwater-resistant Plasticfree

Experimental crushing behavior and energy.absorption of angular gradient honey.omb structures under quasi-static and dy.amic compression

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Defence Technology.防务技术） 2024年第6期36卷 47-63页

作者： Jiachen Li y.chen wei Hao Wu Xingy. shen Mengqi y.an State Key.Laboratory.of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Institute of Occupational Health China Academy of Safety Science and TechnologyBeijing 100012China Beijing Institute of Technology.Chongqing Innovation Center Chongqing 401120China

The high variability.of shock in terrorist attacks poses a threat to people's lives and properties,necessitating the development of more effective protective *** study.focuses on the angle gradient and proposes four different configurations of concave hexagonal honey.omb *** structures'macroscopic deformation behavior,stress-strain relationship,and energy.dissipation characteristics are evaluated through quasi-static compression and Hopkinson pressure bar impact *** study.reveals that,under vary.ng strain rates,the structures deform starting from the weak lay.r and exhibit significant interlay.r ***,interlay.r shear slip becomes more pronounced with increasing strain *** terms of quasi-static compression,sy.metric gradient structures demonstrate superior energy.absorption,particularly.the sy.metric negative gradient structure(SNG-SMS)with a specific energy.absorption of 13.77 J/cm~*** dy.amic impact,unidirectional gradient structures exhibit exceptional energy.absorption,particularly.the unidirectional positive gradient honey.omb structure(UPG-SML)with outstanding mechanical *** angle gradient design play. a crucial role in determining the structure's stability.and deformation mode during *** interlay.r separations result in a more pronounced negative Poisson's ratio effect and enhance the structure's energy.absorption *** findings provide a foundation for the rational design and selection of seismic protection structures in different strain rate impact environments.

关键词： Negative Poisson's ratio Gradient honey.omb structure Quasi-static compression Dy.amic impact Titanium alloy

Contribution of Surface Waves to Sea Surface Temperatures in the Arctic Ocean

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Journal of Ocean University.of China 2024年第5期23卷 1151-1162页

作者： wei Meng SHAO weizeng shen wei HU y.y. ZHANG y. ZUO Juncheng College of Oceanography.and Ecological Science Shanghai Ocean UniversityShanghai 201306China China Waterborne Transport Research Institute Ministry of Transport of the People’s Republic of ChinaBeijing 100088China

The aim of our study.was to examine the contribution of surface waves from WAVEWATCH-III(WW3)to the variation in sea surface temperature(SST)in the Arctic *** simulated significant wave height(SWH)were validated against the products from Haiy.ng-2B(Hy.2B)in 2021,obtaining a root mean squared error(RMSE)of 0.45 with a correlation of 0.96 and scatter index of *** wave-induced effects,i.e.,wave breaking and mixing induced by.nonbearing waves resulting in changes in radiation stress and Stokes drift,were calculated from WW3,ERA-5 wind,SST,and salinity.data from the National Centers for Environmental Prediction and were taken as forcing fields in the Stony.Brook Parallel Ocean *** results showed that an RMSE of 0.81℃ with wave-induced effects was less than the RMSE of 1.11℃ achieved without the wave term compared with the simulated SST with the measurements from *** the four wave effects and sea ice freezing,the SST in the Arctic Ocean decreased by.up to 1℃ in *** analy.is revealed that the SWH was linear in SST(values without subtraction of waves)in summer and autumn,but this behavior was not observed in spring or winter due to the presence of sea *** interannual variation also presented a negative relationship between the difference in SST and SWH.

关键词： sea surface wave sea surface temperature Arctic Ocean