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A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： s.sAURABH R.KIRAN D.sINGH R.VAIsH V.s.CHAUHAN school of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHsDT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. Various helicoidal layup configurations including helicoidal recursive(HR), helicoidal exponential(HE), helicoidal semi-circular(Hs), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

关键词： finite element method (FEM) nonlinear Green-Lagrange inverse hyperbolic shear deformation theory (IHsDT) bio-inspired composite plate helicoidal O322

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Microscopic dynamic observation of adhesion hysteresis friction and exploration of the influence of different pressures on friction transmission

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Friction 2021年第4期9卷 758-773页

作者： Cun-ao FENG De-kun ZHANG Kai CHEN school of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Department of Mechanical Engineering University of British Columbia Vancouver V6T1Z4Canada school of Materials science and Engineering China University of Mining and Technology Xuzhou 221116China

The mechanism of adhesive friction between viscoelastic materials is a key *** this study,the friction process of the adhesive interface between a friction lining and a wire rope is dynamically observed in real time to analyze the adhesion hysteresis friction intuitively and *** adhesion is determined by the state of motion,while the relative displacement of the wire rope and lining is used to find the magnitude of the adhesive *** hysteresis friction is reflected by the internal deformation of the *** magnitude of the hysteresis friction is determined by the displacement difference(Ax)in the sliding direction of two marked points at different distances from the contact *** results show that the adhesion friction is proportional to the loss modulus and the hysteresis friction is proportional to the ratio of the loss modulus to the square of the storage modulus(E"/(E'^(2))).The frictional vibration first decreases and then increases with the increase in *** K25 lining has the highest adhesion hysteresis friction and minimal frictional *** result provides a simple and intuitive method for research into the friction transmission and vibration of viscoelastic materials.

关键词： adhesion hysteresis friction viscoelasticity frictional vibration dynamic monitoring

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Combinatorial therapies for spinal cord injury repair

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Neural Regeneration Research 2025年第5期20卷 1293-1308页

作者： Carla s.sousa Andreia Monteiro António J.salgado Nuno A.silva Life and Health sciences Research Institute(ICVs) School of MedicineUniversity of MinhoCampus de Gualtar-gualtarBragaPortugal ICVs/3B’s Associate Lab PT Government Associated LabCampus de Gualtar-gualtarBragaPortugal

spinal cord injuries have profound detrimental effects on individuals, regardless of whether they are caused by trauma or non-traumatic events. The compromised regeneration of the spinal cord is primarily attributed to damaged neurons, inhibitory molecules, dysfunctional immune response, and glial scarring. Unfortunately, currently, there are no effective treatments available that can fully repair the spinal cord and improve functional outcomes. Nevertheless, numerous pre-clinical approaches have been studied for spinal cord injury recovery, including using biomaterials, cells, drugs, or technological-based strategies. Combinatorial treatments, which target various aspects of spinal cord injury pathophysiology, have been extensively tested in the last decade. These approaches aim to synergistically enhance repair processes by addressing various obstacles faced during spinal cord regeneration. Thus, this review intends to provide scientists and clinicians with an overview of pre-clinical combinatorial approaches that have been developed toward the solution of spinal cord regeneration as well as update the current knowledge about spinal cord injury pathophysiology with an emphasis on the current clinical management.

关键词： electric stimulation neural tissue regeneration neuroprotection polytherapy spinal cord injury

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Predicting Maximum Lifespan Limits at Mean Menopausal Age

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Journal of Mathematical Research with Applications 2025年第1期 133-142页

作者： M.sUMATHI s.ANTONY CARLA Department of Mathematics N.M.S.S.Vellaichamy Nadar College Research scholar (Part-time) Madurai Kamaraj University

The age at which a woman enters natural menopause has also been associated to death from any cause. Menopause is a natural component of aging that happens between the ages of 45 and 55, with the average menopausal age being 51. Previous research has revealed the age at which women reach menopause, but there is no evidence to support the link between menopause and longevity. We made a study in assessing the limits of maximum lifespan at menopausal age in our previous article. In this paper, we aim to predict the maximum lifespan of women at mean menopausal age.

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A Review of the Current Task Offloading Algorithms,strategies and Approach in Edge Computing systems

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Computer Modeling in Engineering & sciences 2023年第1期134卷 35-88页

作者： Abednego Acheampong yiwen Zhang Xiaolong Xu Daniel Appiah Kumah school of Computer science and Technology Anhui UniversityHefei230039China school of Computer and software Nanjing University of Information Science and TechnologyNanjing210044China

Task offloading is an important concept for edge computing and the Internet of Things(IoT)because computationintensive tasksmust beoffloaded tomore resource-powerful remote *** has several advantages,including increased battery life,lower latency,and better application performance.A task offloading method determines whether sections of the full application should be run locally or offloaded for execution *** offloading choice problem is influenced by several factors,including application properties,network conditions,hardware features,and mobility,influencing the offloading system’s operational *** study provides a thorough examination of current task offloading and resource allocation in edge computing,covering offloading strategies,algorithms,and factors that influence *** offloading and partial offloading strategies are the two types of offloading *** algorithms for task offloading and resource allocation are then categorized into two parts:machine learning algorithms and non-machine learning *** examine and elaborate on algorithms like supervised Learning,Unsupervised Learning,and Reinforcement Learning(RL)under machine *** the non-machine learning algorithm,we elaborate on algorithms like non(convex)optimization,Lyapunov optimization,Game theory,Heuristic Algorithm,Dynamic Voltage scaling,Gibbs sampling,and Generalized Benders Decomposition(GBD).Finally,we highlight and discuss some research challenges and issues in edge computing.

关键词： Task offloading machine learning algorithm game theory dynamic voltage scaling

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spirotetramat reduces fitness of the spotted-wing Drosophila,Drosophila suzukii

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Insect science 2024年第4期31卷 1222-1230页

作者： Jing Yang Justin Flaven-Pouchon yiwen Wang Bernard Moussian section of Animal Genetics Interfaculty Institute of Cell BiologyUniversity of TübingenTübingenGermany school of Pharmaceutical science and Technology Tianjin UniversityTianjinChina INRAE CNRSUniversitéCôte d'AzurInstitut Sophia AgrobiotechSophia AntipolisFrance

With climate change,the spotted-wing Drosophila(sWD,Drosophila suzukii)invades a great number of fruit production regions worldwide.A plethora of insecticides are being applied for management of this *** expected,sWD develops resistance against some potent insecticides or is rather insensitive to some ***,there is an urgent need to identify and characterize alternative insecticides to control sWD ***,we have studied the effects of the orally applied inhibitor of the fatty acid synthesis pathway spirotetramat on sWD fitness with respect to fecundity and surface barrier function at different *** our experiments,we applied spirotetramat mixed with baker's yeast and showed that females and males were not repelled by effective concentrations of this *** found that spirotetramat,by trend,lowers egg numbers laid by fed *** eggs rapidly desiccate,and only a few larvae *** is lethal to larvae and reduces survival of adult flies under low-humidity *** together,based on our data,we propose to use yeast supplemented with spirotetramat and additional sWD-specific attractants in traps in non-crop areas in order to eradicate sWD populations before they infest crop production sites.

关键词： desiccation Drosophila suzuki insecticide lipids

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Research on the method of construction disturbance zoning for shield tunnel approaching to urban structures

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Frontiers of structural and Civil Engineering 2024年第11期18卷 1663-1679页

作者： Ziyang ZHOU Fukang GUO Jianzhong NI Kun FENG Jingxuan ZHANG yiwen LIU Key Laboratory of Transportation Tunnel Engineering of Ministry of Education Southwest Jiaotong UniversityChengdu 610031China Hangzhou Fuyang City Construction Investment Group co. Ltd.Hangzhou 310000China

This paper presents a calculation method that evaluates the extent of disturbance based on structural safety ***,it summarizes the assessment methods for construction disturbance zones in shield tunneling near pile foundations,urban ground structures,and underground ***,taking the construction of the Chengdu Jinxiu Tunnel under bridges and urban pipelines as the engineering background,a study on the disturbance zoning of adjacent structures was *** most intense disturbance occurs within one week of the tunnel underpass process,and it has a significant impact within a range of two times the tunnel diameter along the tunnel *** bridge pile and bridge deck experience less disturbance from tunnel approaching construction,with a maximum disturbance zone characterized as medium *** the other hand,underground pipelines are subjected to more significant disturbances from tunnel construction,with a maximum disturbance zone classified as strong *** implementation of“bridge pile sleeve valve pipe grouting&underground pipeline ground grouting&tunnel advance grouting”in the field effectively limits the vertical settlement of bridges and pipelines,resulting in a decrease of approximately 0.1 in disturbance level for the *** disturbance zoning method can assess tunnel disturbance with structures,identify high-risk interference locations,and facilitate targeted design reinforcement solutions.

关键词： shield tunnel approaching construction field monitoring disturbance zoning method

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A 15-user quantum secure direct communication network

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Light(science & Applications) 2021年第12期10卷 2322-2329页

作者： Zhantong Qi Yuanhua Li yiwen Huang Juan Feng Yuanlin Zheng Xianfeng Chen state Key Laboratory of Advanced Optical Communication systems and Networks School of Physics and AstronomyShanghai Jiao Tong University200240 ShanghaiChina Department of Physics Jiangxi Normal University330022 NanchangChina shanghai Research Center for Quantum sciences 201315 ShanghaiChina Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University250358 JinanChina

Quantum secure direct communication(QsDC)based on entanglement can directly transmit confidential ***,the inability to simultaneously distinguish the four sets of encoded entangled states limits its practical ***,we explore a QsDC network based on time–energy entanglement and sum-frequency *** total,15 users are in a fully connected QsDC network,and the fidelity of the entangled state shared by any two users is>97%.The results show that when any two users are performing QsDC over 40 km of optical fiber,the fidelity of the entangled state shared by them is still>95%,and the rate of information transmission can be maintained above 1 Kbp/*** result demonstrates the feasibility of a proposed QsDC network and hence lays the foundation for the realization of satellite-based long-distance and global QsDC in the future.

关键词： quantum hence realization

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Dominant Deformation Mechanisms in Mg–Zn–Ca Alloy

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Acta Metallurgica sinica(English Letters) 2022年第12期35卷 1973-1982页

作者： Tao Ying Mingdi Yu yiwen Chen Huan Zhang Jingya Wang Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming and state Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

The coaddition of Zn and Ca has great potential to improve the ductility of Mg ***,the mechanical properties of an extruded Mg-Zn-Ca solid-solution alloy were studied by quasi-in situ electron backscatter diffraction(EBsD)-assisted slip trace *** dominant deformation mechanisms of the Mg-Zn-Ca alloy were studied,and the origins of enhanced ductility were systematically *** results indicate that most grains deformed by basal *** addition,multiple non-bas al slip traces were detected(particularly prismatic,pyramidal I,and pyramidal Islip traces),and their activation frequency was promoted with increasing tensile *** enhanced participation of non-basal slip systems is believed to play a critical role in achieving homogeneous plastic deformation,thus effectively promoting the ductility of the Mg-Zn-Ca ***,first-principle calculations revealed that the coaddition of Zn and Ca significantly reduces the unstable stacking fault energy for non-basal slip,which contributes to the activation of non-basal slip systems during plastic deformation.

关键词： Mg-Zn-Ca alloy Non-basal slip activities First-principle calculations Generalized stacking fault energy Deformation mechanisms

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Hierarchical Neural Prediction of Interpersonal Trust

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Neuroscience Bulletin 2021年第4期37卷 511-522页

作者： yiwen Wang Xue Yang Zhenpeng Tang s.aobei Xiao Johannes Hewig school of Economics and Management Fuzhou UniversityFuzhou350108China Institute of Psychological and Cognitive sciences Fuzhou UniversityFuzhou350108China school of Psychology Hainan Normal UniversityHaikou571158China Department of Psychology Julius Maximilians University Würzburg97070WürzburgGermany

Exploring neural markers that predict trust behavior may help us to identify the cognitive process underlying trust decisions and to develop a new approach to promote interpersonal *** remains unknown how trust behavior may be predicted early in the decision *** used electrophysiology to sample the brain activity while participants played the role of trustor in an iterative trust *** results showed that during the trust generation stage,the trust condition led to higher frontocentral beta band activity related to cognitive inhibition compared to the distrust condition(item level).Moreover,individuals with higher frontocentral beta band activity were more likely to perform trust choices at the single-trial level(individual level).Furthermore,after receiving reciprocity feedback on trialn-1,compared to the betrayal feedback and the distrust choice,the frontocentral beta band oscillation had a stronger predictive effect regarding trust choices on *** findings indicate that beta band oscillations during the decision generation stage contribute to subsequent trust choices.

关键词： Interpersonal trust hierarchical prediction trust game beta band oscillation

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