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Continuously adjustable mech.nical metamaterial based on planetary gear trains and external mesh.ng gears

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Applied Math.matics and Mech.nics(English.Edition) 2025年第2期46卷 233-252页

作者： Sh.ai MO Xu TANG Keren Ch.N h. h.UJOh.Wei Zh.NG State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Mechanical Engineering Guangxi University State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University State Key Laboratory of Digital Manufacturing Equipment and Tech.ology Huazhong University of Science and Technology Precision and Intelligence Laboratory Tokyo Institute of Technology

Th. metamaterial based on external mesh.ng gears(MEG) is designed based on th. principle of external mesh.ng gear transmission. Based on th. mesh.ng transmission principle of external mesh.ng gears and planetary gear trains, th. internal and external gear rings are designed. Based on th. internal and external gear rings, th. metamaterial based on inner and outer planetary gear trains(MIP) is designed to study th. sh.ar modulus, Young's modulus, and amplitude-frequency ch.racteristics of th. metamaterial based on gears at different angles. Th. effects of th. number of planetary gears on th. ph.sical ch.racteristics of th. MIP are studied. Th. results sh.w th.t th. MEG can be continuously adjusted by adjusting th. sh.ar modulus and Young's modulus due to its mesh.ng ch.racteristics. With.th. same number of gears, th. adjustment range of th. MIP is larger th.n th. adjustment range of th. MEG. Wh.n th. number of planetary gears increases, th. adjustment range of th. MIP decreases. Moreover, wh.n th. metamaterial based on gears rotates, th. h.rmonic response ch.nges with.th. ch.nge of th. angle.

关键词： metamaterial adjustable external inner and outer planetary gear train TB34

Dynamic stress concentration in an infinitely long cylindrical cavity due to a point sph.rical source embedded with.n a fluid-saturated poroelastic formation of infinite extent

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Applied Math.matics and Mech.nics(English.Edition) 2025年第1期46卷 139-156页

作者： h.h.SSEINI O.BALILASh.KI Department of Mech.nical Engineering Faculty of EngineeringGolestan University

Th. effects of a h.rmonically exciting monopole source on an infinitely long cylindrical cavity embedded entirely with.n a fluid-saturated poroelastic formation of infinite extent are examined th.oretically. It is assumed th.t th. source is located outside th. cavity at a specified distance from th. boreh.le axis. Th. magnitudes of th. h.op and radial stresses beside th. pore pressures exerted on th. interface and inside th. porous medium surrounding th. boreh.le are calculated and discussed. Biot's poroelastic modeling along with.th.ee types of boundary conditions for th. cylindrical interface including th. ideal fluid, empty boreh.le, and rigid inclusion with.a h.rd boundary is employed for th. analysis. Utilizing a proper translational addition th.orem for expressing th. incident sph.rical wave in terms of cylindrical wave expansions, th. proposed boundary conditions at th. interface are satisfied. Stresses are formulated by means of wave potential functions in a th.ee-dimensional(3D) manner. Th. effects of th. frequency and th. radial distance between th. source and boreh.le on th. induced stresses are examined for th. first cylindrical modes over frequency spectra. Two permeability conditions for th. interface and th.ee types of soils for th. porous formation are considered th.ough.ut th. analysis. To give an overall outline of th. study, a numerical example is presented. Th. results clearly indicate th.t th. distance is a key parameter and h.s considerable effects on th. induced stress values. In addition, th. interface permeability condition and soil ch.racteristics play an important role in determining th. dynamic response of th. boreh.le. Finally,th. obtained results are compared with.th. relevant analyses existing in th. literature for some limit cases, and good agreement is ach.eved.

关键词： cylindrical cavity O353.4 point source porous medium stress concentration wave-field transformation

h.gh.quality control of receiver functions using a capsule neural network

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Earth.uake Science 2025年第2期38卷 93-109页

作者： Mona h. h.gazi Ah.ad M. Faried Omar M. Saad National Research.Institute of Astronomy and Geoph.sics (NRIAG) Cairo 11421 Egypt Division of Ph.sical Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Th. Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in north.rn Egypt is th. main earth.uake zone in th. country, with.a moderate-to-h.gh.seismic h.zard and a h.story of significant earth.uakes caused by rifting and active faulting. To improve our understanding of th. tectonic and seismic processes in th.s area, more compreh.nsive imaging of th. crustal structure is required. Th.s can be ach.eved by increasing th. number of receiver functions (RFs) recorded by th. seismic stations in north.rn Egypt and th. south.astern Mediterranean. Data h.ndling and processing sh.uld also be automated to increase process efficiency. In th.s study, we developed a capsule neural network for automated selection of RFs. Th. model was trained on a dataset containing RFs (both.selected and unselected) from five broadband stations in north.rn Egypt. Stations SLM, SIWA, KOT, NBNS, and NKL are located in th. unstable sh.lf region of Egypt, wh.re limited knowledge of th. deep crustal structure is available. Th. proposed capsule neural network ach.eved an average precision of 80% on th. test set. Th. automated selection of RFs using a capsule neural network h.s th. potential to significantly improve th. efficiency and accuracy of RF analysis, as demonstrated by th. stacking test. Th.s could lead to a better understanding of crustal structure and tectonic processes in north.rn Egypt and th. south.astern Mediterranean.

关键词： crustal structure receiver functions deep learning north.rn Egypt

Evaluation of th. Effectiveness of Traditional and Nano Materials Used in Consolidation of Sandstone Used in Ramesses III Temple, Karnak, Egypt

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Journal of Minerals and Materials Ch.racterization and Engineering 2025年第1期13卷 18-30页

作者： Essam h. Moh.med Zeinab Mah.oud Ah.ed Mah.oud L. Abd El-Latif Department of Arch.eological Conservation Faculty of Archaeology South Valley University Qena Egypt Department of Conservation Faculty of Archaeology South Valley University Qena Egypt h.using and Building Research.Center Giza Egypt

Th.s experimental study assesses th. effectiveness of traditional and nano-materials in enh.ncing th. ph.sical and mech.nical properties of deteriorated sandstone from Ramesses III Temple, Karnak, Luxor, Egypt. Treatments included Nano Estel (5%), Paraloid B-72 (3%), Paraloid B-72/Nano Estel (3%/5%), and eth.l silicates. Treated samples underwent Scanning Electron Microscopy (SEM) and ph.sical/mech.nical testing. Results sh.w th.t Paraloid B-72/Nano Estel (3%/5%) yielded optimal consolidation, significantly improving sandstone’s ph.sical and mech.nical properties.

关键词： Ramesses III Temple Deteriorated Sandstone Consolidation Treatments Nano Material Ph.sical and Mech.nical Properties

Multi-Objective optimization for stable and efficient cargo transportation of partial space elevator

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Defence Tech.ology(防务技术) 2025年第2期44卷 17-29页

作者： Gefei Sh. Zh.ng h.Zh. Sch.ol of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China Sh.nzh.n Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China Department of Mech.nical Engineering York University4700 Keele StreetTorontoCanada

Th.s paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of th. classic analytical speed function to control th. climber's speed along a partial space elevator to improve libration stability in cargo *** LD-ASF is furth.r optimized for payload transportation efficiency by a novel coordinate game th.ory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive *** transfer period is divided into several sections to reduce computational *** validity and efficacy of th. proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer *** results reveal th.t th. optimized LD-ASF results in h.gh.r transportation speed,stable end body's libration,lower th.ust fuel consumption,and more flexible optimization space th.n th. classic analytical speed function.

关键词： Partial space elevator Stable transportation Libration decoupling analytical speed function Coordinate game Model predictive control Pareto optimization

Towards h.gh.performance cath.des for Na-ion batteries

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Science Bulletin 2018年第9期63卷 529-530页

作者： marnix Wagemaker Department of Radiation Science and Tech.ology Delft University of Technology

Th. efficient and h.gh.energy storage in rech.rgeable lith.um batteries h.s enabled portable electronic equipment,th. demands on wh.ch.are ever increasing as it also appears to be th. tech.ology of ch.ice for electrical ***,rech.rgeable lith.um batteries appear to be suitable tech.ology to stabilize th. electrical grid and to lift th. intermittency of renewable energy on a daily *** lith.um is relatively abundant in th. Earth.s crust,

关键词：锂电池 Na 阴极离子电子设备可充电便携式不均匀

ON Th. GAUSSIAN KINEMATIC FORMULA OF *** AND ***

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Acta Math.matica Scientia 2025年第1期45卷 200-214页

作者： Joseph.h.G.Fu Department of Math.matics University of GeorgiaAthensGA30602USA

We apply meth.ds of algebraic integral geometry to prove a special case of th. Gaussian kinematic formula of *** idea,suggested already by Adler and Taylor,is to view th. GKF as th. limit of sph.rical kinematic formul... 详细信息

关键词： integral geometry kinematic formula probability density Gaussian density

Neuroinflammation as a th.rapeutic target in h.ntington's disease

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Neural Regeneration Research 2025年第3期20卷 817-818页

作者： Andrea Kwakowsky Th.lani h.Palpagama Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CentreUniversity of GalwayGalwayIreland

In 1872, George h.ntington presented h.s essay “On Ch.rea” to th. Meigs and Mason Academy of Medicine and, in doing so, detailed a disease th.t would later bear h.s name. h.ntington's disease(h.) is a genetic, neurodegenerative disease th.t manifests as th. loss of motor control,cognitive impairment,and mood and psych.atric ch.nges in paents.

关键词： h.ntington inflammation Medicine

Glial response in th. midcingulate cortex in h.ntington’s disease

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Neural Regeneration Research 2025年第1期20卷 207-208页

作者： Th.lani h.Palpagama Andrea Kwakowsky Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CenterUniversity of GalwayGalwayIreland

h.ntington’s disease(h.)is a genetic disease ch.racterized by th. progressive degeneration of th. striatum and *** can present with.a variety of symptoms th.t can broadly be classified into motor symptoms,inclusive of ch.reatic movements and rigidity,mood and psych.atric symptoms,such.as depression and apath.,and cognitive symptoms,such.as cognitive *** causal mutation underlying h. results from an expansion of a CAG repeat sequence on th. IT15 gene,resulting in th. formation and accumulation of a mutant h.ntingtin protein.

关键词： h.ntington degeneration cortex