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Friction and Deformation Behavior of human skin During Robotic sliding Massage Operation

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Journal of Bionic Engineering 2024年第4期21卷 1892-1904页

作者： Jingmei zhai Rixing Li Ziqing su school of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510000China

This study investigates the friction and deformation behavior of the skin in contact with a rigid massage ball and its influencing *** and stretching experiments were conducted using a collaborative robot experimental *** experiments encompassed a loading normal force range of 2 N to 18 N and a sliding speed range of 10 mm/s to 20 mm/*** friction response curve exhibits two different stages:static stick state and dynamic stick-slip stage,both of which have been mathematically *** analyzing the experimental data,we analyzed the effects of elastic modulus,sliding speed and normal loading force on skin tangential friction and tensile *** results indicate that as the normal load increases,both friction and deformation exhibit an ***,they decrease with an increase in elastic ***,while deformation diminishes with higher sliding speed,friction force remains relatively unaffected by *** observation can be attributed to the strain rate sensitivity resulting from the viscoelastic characteristics of the skin under substantial *** study advances the understanding of friction and deformation behavior during skin friction,offering valuable insights to enhance the operational comfort of massage robots.

关键词： human skin Friction sliding Deformation Robotic massage stereo image

A study on Enhancing Chip Detection Efficiency Using the Lightweight Van-YOLOv8 Network

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Computers, Materials & Continua 2024年第4期79卷 531-547页

作者： Meng huang honglei Wei Xianyi zhai school of Mechanical Engineering and Automation Dalian Polytechnic UniversityDalian116034China

In pursuit of cost-effective manufacturing,enterprises are increasingly adopting the practice of utilizing recycled semiconductor *** ensure consistent chip orientation during packaging,a circular marker on the front side is employed for pin alignment following successful functional ***,recycled chips often exhibit substantial surface wear,and the identification of the relatively small marker proves ***,the complexity of generic target detection algorithms hampers seamless *** these issues,this paper introduces a lightweight YOLOv8s-based network tailored for detecting markings on recycled chips,termed ***,to alleviate the influence of diminutive,low-resolution markings on the precision of deep learning models,we utilize an upscaling approach for enhanced *** technique relies on the super-Resolution Generative Adversarial Network with Extended Training(sRGANext)network,facilitating the reconstruction of high-fidelity images that align with input ***,we replace the original YOLOv8smodel’s backbone feature extraction network with the lightweight VanillaNetwork(VanillaNet),simplifying the branch structure to reduce network ***,a hybrid Attention Mechanism(hAM)is implemented to capture essential details from input images,improving feature representation while concurrently expediting model inference *** results demonstrate that the Van-YOLOv8 network outperforms the original YOLOv8s on a recycled chip dataset in various ***,it demonstrates superiority in parameter count,computational intricacy,precision in identifying targets,and speed when compared to certain prevalent algorithms in the current *** proposed approach proves promising for real-time detection of recycled chips in practical factory settings.

关键词： Lightweight neural networks attention mechanisms image super-resolution enhancement feature extraction small object detection

Peer-to-Peer Trading in Distribution systems with the Utility's Operation

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CsEE Journal of Power and Energy systems 2024年第2期10卷 629-638页

作者： Xuanyi Xiao Feng Wang Mohammad shahidehpour Yujia zhai Quan Zhou Department of Electrical and Information Engineering Hunan UniversityChangshaChina Robert W.Galvin Center for Electricity Innovation Ilinois Institute of TechnologyChicagoIL60616USA

To realize a liberalized peer-to-peer (P2P) electricity market in distribution systems with network security, this paper develops a general framework for P2P trading in distribution systems with the utility's operation. The model is formulated as a bi-level programming. The utility's operation is an upper level problem, where a calculation method of network usage charges for P2P trading is also proposed. Peers' P2P trading is a lower level problem. An iterative algorithm based on analytical target cascading (ATC) is proposed to solve the model, where the interactions between utility and peers are presented. Numerical results on the IEEE 33-bus system demonstrate that the proposed method realizes a liberalized P2P market and ensures network security in distribution systems.

关键词： Distribution system peer-to-peer trading electricitymarket distributed energyresources(DERs) analytical target cascading(ATC)

A COMPACT EMBEDDING REsULT FOR NONLOCAL sOBOLEV sPACEs AND MULTIPLICITY OF sIGN-ChANGING sOLUTIONs FOR NONLOCAL sChRÖDINGER EQUATIONs

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Acta Mathematica scientia 2024年第5期44卷 1853-1876页

作者： Xu ZhANG hao zhai Fukun ZhAO Department of Mathematics Wuhan University of TechnologyWuhan430070China Department of Mathematics Yunnan Normal UniversityKunming650500China

For any s∈(0,1),let the nonlocal sobolev space X^(s)(ℝ^(N))be the linear space of Lebesgue measure functions fromℝN toℝsuch that any function u in X^(s)(ℝ^(N))belongs to L2(ℝN)and the function(x,y)\longmapsto\big(u(x)-u(y)\big)\sqrt{K(x-y)}is in L2(ℝN,ℝN).First,we show,for a coercive function V(x),the subspace E:=\bigg\{u\in X^s(\mathbb{R}^N):\int_{\mathbb{R}^N}V(x)u^2{\rm d}xs)(ℝ^(N))is embedded compactly into L^(p)(ℝ^(N))for p\in[2,2_s^*),where 2_s^*is the fractional sobolev critical *** terms of applications,the existence of a least energy sign-changing solution and infinitely many sign-changing solutions of the nonlocal schrödinger equation-{\cal{L}_K}u+V(x)u=f(x,u),\x\in\\mathbb{R}^N are obtained,where-{\cal{L}_K}is an integro-differential operator and V is coercive at infinity.

关键词： sign-changing solution integro-differential operator least energy variational method

Effect of Iron on the stability of Rhodochrosite at the Topmost Lower Mantle Conditions

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Journal of Earth science 2024年第2期35卷 504-513页

作者： Tianlei zhai Fei Qin shengxuan huang shan Qin Yu Gong Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of EducationSchool of Earth and Space SciencesPeking UniversityBeijing100871China school of Earth sciences and Resources China University of GeosciencesBeijing100083China Beijing synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

Carbonates are viewed as the principal oxidized carbon carriers during subduction,and thus the stability of subducted carbonates has significant implications for the deep carbon *** we investigate the high pressure-temperature behaviors of rhodochrosite in the presence of iron up to∼34 GPa by in-situ X-ray diffraction and ex-situ Raman *** relatively low temperature below∼1500 K,MnCO_(3)breaks down into MnO and CO_(2).Upon heating to∼1800 K,however,the MnCO_(3)-Fe^(0)reactions occur with the formation of Mn_(3)O_(4),Fe^(O)and reduced carbon.A'three-stage'reaction mechanism is proposed to understand the kinetics of the carbon-iron-manganese redox *** results suggest that Fe^(0)can serve as a reductant to greatly affect the stability of rhodochrosite,which implies that the effect of Fe-metal should be seriously considered for the high pressure-temperature behaviors of other predominant carbonates at Earth's mantle conditions,particularly at depths greater than∼250 km.

关键词： deep carbon cycle rhodochrosite reduced mantle diamond formation high pressure tectonics geochemistry

Robotic compliant assembly for complex-shaped composite aircraft frame based on Gaussian process considering uncertainties

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Chinese Journal of Aeronautics 2024年第10期37卷 471-482页

作者： Yingke YANG Dongsheng LI Yunong zhai Jie WANG Lei XUE Zhiyong YANG school of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 3158002China COMAC shanghai Aircraft Manufacturing Co. Ltd.Shanghai 201324China

Robots are finding increasing application in aircraft composite structure assembly due to their flexibility and the growing demand of aircraft manufacturers for high production *** contact force of the composite frame in a robotic assembly of the aircraft composite fuselage panel can hardly be controlled due to the multi-surface variable contact stiffness caused by compliance and complex shape with multiple mating *** paper proposes a robotic assembly system for the aircraft composite fuselage frame with a compliant contact force control strategy using the Gaussian process surrogate ***,a robotic assembly system is introduced,and the global coordinate system transformation model is ***,a compliant force control architecture is designed to generate the desired output ***,a Gaussian process surrogate model with uncertainties is utilized to model the complicated relationship between the robot’s output force and the normal contact force acting on the mating surface of the composite ***,an optimal contact force control strategy is implemented to improve the contact ***,an experiment demonstrates that the proposed methodology can ensure that the contact force on each surface is within the limit of the engineering specification and uniformly distributed,improving the quality compared to the traditional assembly process.

关键词： Aircraft Composite structure assembly Multi-surface contact Compliant control Gaussian process Uncertainty

Dendritic tip selection during solidification of alloys:Insights from phase-field simulations

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Chinese Physics B 2024年第9期33卷 467-472页

作者： Qingjie Zhang hui Xing Lingjie Wang Wei zhai school of Physical science and Technology Northwestern Polytechnical UniversityXi’an710072China Research&Development Institute of Northwestern Polytechnical University in shenzhen Shenzhen 518063China

The effect of undercooling DT and the interface energy anisotropy parameter e4 on the shape of the equiaxed dendritic tip has been investigated by using a quantitative phase-field model for solidification of binary *** was found that the tip radius r increases and the tip shape amplitude coefficient A4 decreases with the increase of the fitting range for all *** dendrite tip shape selection parameter sdecreases and then stabilizes with the increase of the fitting range,and sincreases with the increase of *** relationship between sand e4 follows a power-law function sµea 4,and a is independent of DT but dependent on the fitting *** results demonstrate that the predicted sis consistent with the curve of microscopic solvability theory(MsT)for e4sobtained from our phase-field simulations is sensitive to the undercooling when e4 is fixed.

关键词： phase-field simulations dendritic structure interface energy anisotropy tip shape selection parameter

A machine learning model for colorectal liver metastasis post-hepatectomy prognostications: several strategies for the model evaluation

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hepatobiliary surgery and Nutrition 2024年第4期13卷 752-754页

作者： Guang-Yao Li Lu-Lu zhai Department of General surgery The Second People’s Hospital of WuhuWuhuChina Department of General surgery The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiChina

With great interest,we read the article by Lam et al.(1)entitled“A machine learning model for colorectal liver metastasis post-hepatectomy prognostications”.In this study,the authors included colorectal liver metastasis(CRLM)patients from four hospitals in hong Kong who underwent hepatic resection,and developed a survival prediction model based on the patients’demographic,oncologic,clinicopathologic,and therapeutic characteristics using machine *** Cox proportional hazards and least absolute shrinkage and selection operator(LAssO)regression analyses,the authors successfully developed a predictive model consisting of eight predictors that could accurately predict overall survival(Os)and recurrence-free survival(RFs)after hepatectomy in patients with *** is an intriguing study with significant clinical value,and the authors deserve to be commended for their ***,there are still several issues that need to be addressed in this study.

关键词： Colorectal liver metastasis(CRLM) hepatectomy survival prediction model

An observed nocturnal ozone transport event in the sichuan Basin,southwestern China

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Journal of Environmental sciences 2024年第4期138卷 10-18页

作者： Ruyue Guo Guangming shi Dan Zhang Yang Chen Chao Peng Chongzhi zhai Fumo Yang Department of Environmental science and Engineering Sichuan UniversityChengdu 610065China College of Carbon Neutrality Future Technology Sichuan UniversityChengdu 610065China National Engineering Research Center on Flue Gas Desulfurization Chengdu 610065China Chongqing Academy of Eco-Environmental science Chongqing 401147China Research Center for Atmospheric Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Key Laboratory for Urban Atmospheric Environment Integrated Observation&Pollution Prevention and Control of Chongqing Chongqing 401147China

The ozone(O_(3))pollution in China drew lots of attention in recent years,and the sichuan Basin(sCB)was one of the regions confronting worsening O_(3)pollution *** previous studies have shown that regional transport is an important contributor to O_(3)***,very few features of the O_(3)profile during transport have been reported,especially in the border regions between different administrative *** this study,we conducted tethered balloon soundings in sCB during the summer of 2020 and captured a nocturnal O_(3)transport event during the ***,the O_(3)transport occurred in the bottom of the residual layer,between 200 and 500 m above ground ***,the transport pathway was directed from southeast to northwest based on the analysis of the wind field and air mass *** effect of transport in the residual layer on the surface O_(3)concentration was related to the spatial distribution of O_(3).For cities with high O_(3)concentrations in the upwind region,the transport process would bring clean air masses and abate *** downwind lightly polluted cities,the transport process would slow down the decreasing or even increase the surface O_(3)concentration during the *** provided observational facts on the profile features of a transboundary O_(3)transport event between two provincial administrative divisions,which implicated the importance of joint prevention and control ***,the sounding parameters were limited and the quantitative analysis was preliminary,more integrated,and thorough studies of this topic were called for in the future.

关键词： Ozone sichuan basin Transport event Vertical profile