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A comprehensive investigation on nonlinear vibration and bending character.s.ics 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 structur.s.found in nature, pr.s.nt 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 r.s.lts show that the laminate sequence exer.s.a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies acr.s. different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

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Construction of 3D porous Cu_(1.81)s/nitrogen-doped carbon framewor.s.for ultrafast and long-cycle life sodium-ion storage

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 191-200页

作者： chen chen Hongyu Xue Qilin Hu Mengfan Wang Pan shang Ziyan Liu Tao Peng Deyang Zhang Yongsong Luo Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China school of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for.s.dium-ion batteries(sIBs)due to their high theoretical specific ***,the inferior intrinsic conductivity and large volume variation during sodiation-desodiation processes seriously affect its high-rate and long-cyde performance,unbeneficial for the application as fast-charging and long-cycling sIBs ***,the three-dimensional porous Cu_(1.81)s/nitrogen-doped carbon framewor.s.Cu_(1.81)s/NC)are synthesized by the simple and facile sol-gel and annealing processes,which can accommodate the volumetric expansion of Cu_(1.81)s nanoparticles and accelerate the transmission of ions and electrons during Na^(+)insertion/extraction processes,exhibiting the excellent rate capability(250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding cycling stability(70% capacity retention for 6000 cycles at 10.0 A·g^(-1))for ***,the Na-ion full cells coupled with Na_(3)V_(2)(PO_(4))_(3)/C cathode also demonstrate the satisfactory reversible specific capacity of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-cycle performance with the 86.9% capacity retention at 2.0 A·g^(-1)after 750 *** work proposes a promising way for the conversionbased metal sulfides for the applications as fast-charging sodium-ion battery anode.

关键词： copper.s.lfide nanoparticles porous carbon framework fast charging long-cycle performance sodium-ion full batteries

DOUBLE s-BrEAKING CUBIC TUrNING POINTs AND THEIr COMPUTATION

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Journal of Computational Mathematics 1996年第1期14卷 8-22页

作者： r.s. Ye Z.H. Yang(Department of Mathematics, shanghai University of science and Technology, shanghai,China) 上海大学数学系上海

In the paper we are concerned with double s-breaking cubic turning points of two-parameter nonlinear problems in the pr.s.nce of Z(2)-symmetry. Three extended systems are proposed to determine double s-breaking cubic turning points. We show that there exist two kinds of singular point path passing through double s-breaking cubic turning point, One is the simple quadratic turning point path, the other is the pitchfork bifurcation point path.

关键词： DOUBLE s-BrEAKING CUBIC TUrNING POINTs AND THEIr COMPUTATION Pro

Effect of adrenalectomy on rat epididymidis

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Asian Journal of Andrology 2002年第4期4卷 273-279页

作者： Neena Nair r.s. Bedwal r.s. Mathur Cell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 India

AIM: To investigate the effect of adrenalectomy (ADX) on the epididymidis of sprague-Dawley rats. METHODs: The histological, biochemical (cholesterol protein, zinc, copper, alkaline and acid phosphatase aryl sulphatase, lactic dehydrogenase and leucine amino peptidase) and hormonal (FsH, LH and testosterone) changes of caput and cauda epididymis in ADX rats were observed. r.s.LTs: Organ wet weight, histological studies and morphometric measurements indicated a cellular degeneration in caput and cauda epididymis of ADX rats. serum testosterone level was significantly lower in ADX than in sham-operated rats, while the serum FsH and LH were below the detection limit of 1 mIU/mL. The enzymatic activity was higher in ADX than in sham-operated rats. Epididymal zinc level increased whereas copper level decreased in ADX rats compared to the sham-operated. CONCLUsION: Adrenalectomy leads to degeneration of caput and cauda epididymidis epithelial cells as a r.s.lt of decreased supply of testosterone.

关键词： Adrenalectomy Acid Phosphatase Alkaline Phosphatase Animals Arylsulfatases Cholesterol Comparative study Copper Epididymis Follicle stimulating Hormone L-Lactate Dehydrogenase Leucyl Aminopeptidase Luteinizing Hormone Male Organ size rats rats, sprague-Dawley reference Values r.s.arch support, Non-U.s. Gov't Testosterone Time Factors Zinc

revisiting cerebral endothelial cells in Alzheimer.s.disease

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Neural regeneration r.s.arch 2025年第10期20卷 2911-2912页

作者： Amira s.Hanafy Department of Neur.s.rgery University Hospital BonnBonnGermany

Alzheimer.s.disease(AD)is the most common neurodegenerative disorder characterized by slow and progr.s.ive decline of cognitive and memory *** only approximately 5%of the cases,AD is familial,as often predisposed by genetic mutations(Hoogmartens et al.,2021),while sporadic AD accounts for approximately 95%of the *** amyloid cascade hypothesis is one of the fundamental hypotheses put out to explain AD pathogenesis as dysregulated homeostasis of amyloid-β(Aβ)peptides that leads to the accumulation of Aβplaques in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

Electrical and optical properties of lithium borate glasses doped with Nd_2O_3

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Journal of rare Earths 2012年第8期30卷 785-789页

作者： r.s. Gedam D.D. ramteke Department of Applied Physics Visvesvaraya National Institute of Technology

Glass series with general formula 25Li2O-（75-x）B2O3-xNd2O3 was prepared by conventional melt quench technique. Electrical and optical characterizations of these glasses were carried out. It was observed that conductivity of glasses decreased and activation energy in- creased with the addition of Nd2O3. The density and refractive index of the glasses increased while optical band gap and radiation length de- creased due to structural changes.

关键词： conductivity density refractive index optical absorption Tauc's plot rare earths

Construction of Ni single-atom coordinated with doped N and s elements for mild hydrogenation of methyl acrylate to methyl propionate

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Nano r.s.arch 2025年第1期18卷 217-224页

作者： Taolue sun chen Jian Gang Wang Hui Zhao Guoliang Zhang Zengxi Li Chunshan Li state Key Laboratory of Mesoscience and Engineering CAS Key Laboratory of Green Process and EngineeringBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China school of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Huizhou Institute of Green Energy and Advanced Materials Huizhou 516081China Advanced Energy science and Technology Guangdong Laboratory Huizhou 516081China

Although the nickel-based catalyst is able toexhibit comparative catalytic activity to noble metal formethyl acrylate hydrogenation,it requir.s.strict reactioncondition,which can be improved by regulation ofcoordination *** this study,we constructed akind of Ni single-atom coordinated with N and s(Ni-NsC)through the pyrolysis of organic Ni-based precursors at600℃.The existence and fine structure of Ni single-atom were confirmed by the spherical electron micr.s.opicobservation in combination with the X-ray absorption spectr.s.opy(XAs)*** addition,the catalytichydrogenation assessment suggested that the as-prepared Ni-NsC catalyst exhibited higher activity and stability than theNi/NsC supported catalyst prepared by incipient wetness impregnation *** remarkable catalytic activity was dueto the high dispersion and density of Ni single-atom and weak adsorption energy of intermediates on these Ni sites.

关键词： methyl acrylate mild hydrogenation Ni single-atom coordination environment adsorption energy

Emerging structur.s.and dynamic mechanisms ofγ-secretase for Alzheimer.s.disease

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Neural regeneration r.s.arch 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.Wolfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemistry University of KansasLawrenceKSUSA

γ-secretase,called“the proteasome of the membrane,”is a membrane-embedded protease complex that cleaves 150+peptide substrates with central roles in biology and medicine,including amyloid precursor protein and the Notch family of cell-surface *** inγ-secretase and amyloid precursor protein lead to early-onset familial Alzheimer.s.disease.γ-secretase has thus served as a critical drug target for treating familial Alzheimer.s.disease and the more common late-onset Alzheimer.s.disease as ***,critical gaps remain in understanding the mechanisms of processive proteolysis of substrates,the effects of familial Alzheimer.s.disease mutations,and allosteric modulation of substrate cleavage byγ-*** this review,we focus on recent studies of structural dynamic mechanisms ofγ-*** mechanisms,including the“Fit-stay-Trim,”“sliding-Unwinding,”and“Tilting-Unwinding,”have been proposed for.s.bstrate proteolysis of amyloid precursor protein byγ-secretase based on all-atom molecular dynamics *** an incorrect registry of the Notch1 substrate was identified in the cryo-electron micr.s.opy structure of Notch1-boundγ-secretase,molecular dynamics simulations on a r.s.lved model of Notch1-boundγ-secretase that was reconstructed using the amyloid precursor protein-boundγ-secretase as a template successfully capturedγ-secretase activation for proper cleavages of both wildtype and mutant Notch,being consistent with biochemical experimental *** approach could be potentially applied to decipher the processing mechanisms of various substrates byγ-*** addition,controversy over the effects of familial Alzheimer.s.disease mutations,particularly the issue of whether they stabilize or destabilizeγ-secretase-substrate complexes,is ***,an outlook is provided for future studies ofγ-secretase,including pathways of substrate binding and product release,effects of modulators on familial Alzheimer.s.disease mutations

关键词： Alzheimer.s.disease amyloid precursor protein cryo-EM structures drug design intramembrane proteolysis molecular dynamics Notch

Vector meson's spin alignments in high energy reactions

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science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 5-20页

作者： Jin-Hui chen Zuo-Tang Liang Yu-Gang Ma Xin-Li sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application (MoE) Institute of Modern PhysicsFudan University Institute of Frontier and Interdisciplinary science Key Laboratory of Particle Physics and Particle Irradiation (MOE)Shandong University INFN-Firenze Department of Modern Physics University of Science and Technology of China school of Mechanics and Physics Anhui University of Science and Technology

The global spin alignment of vector mesons has been observed by the sTAr collaboration at the relativistic Heavy Ion Collider （rHIC） at Brookhaven National Laboratory （BNL）.It provides a unique opportunity to probe the correlation between the polarized quark and antiquark in the strongly coupled quark-gluon plasma （sQGP） produced in relativistic heavy ion collisions,opening a new window to explore the properties of s *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e+e-annihilations at high energies where hadron production is dominated by quark fragmentation *** r.s.lts obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we pr.s.nt a brief review of theoretical and experimental advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation