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Nonlinear wave dispe.s.on in monoatomic chains with lumped and distributed masses:discrete and continuum models

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Applied Mathematics and Mechanics(english edition) 2024年第4期45卷 633-648页

作者： e.GHAVANLOO s.eL-BORGI school of Mechanical engineering Shiraz UniversityShiraz 71963-16548Iran Mechanical engineering Program Texas A&M University at QatarDoha 23874Qatar

The main objective of this paper is to investigate the influence of inertia of nonlinear springs on the dispe.s.on behavior of discrete monoatomic chains with lumped and distributed *** developed model can represent the wave propagation problem in a non-homogeneous material consisting of heavy inclusions embedded in a *** inclusions are idealized by lumped masses,and the matrix between adjacent inclusions is modeled by a nonlinear spring with distributed ***,the model is capable of depicting the wave propagation in bi-material bars,wherein the first material is represented by a rigid particle and the.s.cond one is represented by a nonlinear spring with distributed *** discrete model of the nonlinear monoatomic chain with lumped and distributed masses is first considered,and a closed-form expre.s.on of the dispe.s.on relation is obtained by the.s.cond-order Lindstedt-Poincare method(LPM).Next,a continuum model for the nonlinear monoatomic chain is derived directly from its discrete lattice model by a suitable continualization *** subsequent use of the.s.cond-order method of multiple.s.ales(MMs)facilitates the derivation of the corresponding nonlinear dispe.s.on relation in a closed *** novelties of the present study consist of(i)considering the inertia of nonlinear springs on the dispe.s.on behavior of the discrete mass-spring chains;(ii)developing the.s.cond-order LPM for the wave propagation in the discrete chains;and(iii)deriving a continuum model for the nonlinear monoatomic chains with lumped and distributed ***,a parametric study is conducted to examine the effects of the design paramete.s.and the distributed spring mass on the nonlinear dispe.s.on relations and phase velocities obtained from both the discrete and continuum *** paramete.s.include the ratio of the.s.ring mass to the lumped mass,the nonlinear stiffne.s.coefficient of the.s.ring,and the wave amplitude.

关键词： nonlinear mass-spring chain discrete model continuum model LindstedtPoincare method(LPM) method of multiple.s.ales(MMs) dispe.s.on phase velocity

evaluation of the.s.ismic behavior of reinforced concrete.s.ructures with flat slab-column gravity frame and shear walls through nonlinear analysis methods

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earthquake engineering and engineering Vibration 2024年第3期23卷 713-726页

作者： M.A.Najafgholipour s.Heidarian Radbakhsh e.erfani Department of Civil and environmental engineering Shiraz University of TechnologyShiraz ***Iran Department of Building Civiland Environmental EngineeringConcordia UniversityMontréal H3G 1M8Canada

This paper presents an investigation of the.s.ismic behavior of reinforced concrete(RC)structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor syste.s.is not considered in the.s.ismic design *** this regard,the behavior of six prototype.s.ructures(with different heights and plan layouts)is investigated through nonlinear static and time history analyses,implemented in the Ope.s.es *** results of the analyses are presented in terms of the behavior of the.s.ab-column connections and their mode of failure at different loading ***,the global response of the buildings is discussed in terms of some paramete.s.such as lateral ove.s.rength due to the gravity flat slab-column *** to the nonlinear static analyses,in structures in which the.s.ab-column connections were designed only for gravity loads,the.s.ab-column connections exhibited a punching mode of failure even in the early stages of ***,the punching failure was eliminated in structures in which a minimum transve.s. reinforcement recommended in ACI 318(2019)was provided in the.s.abs at joint ***,despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the.s.ructures,a relatively significant ove.s.rength was imposed on the.s.ructures by the gravity frames.

关键词： RC flat slab-column frames se.s.ic behavior nonlinear analysis time history analysis

emission colour tuning in KLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)phosphor

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Journal of Rare earths 2024年第1期42卷 57-65,I0002页

作者： Janani K Gayathri e Vijayatha V Ramasubramanian s Thiyagarajan P Department of science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Department of sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Department of Physics Anna UniversityChennaiIndia

KLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction *** each of the Yb^(3+)/er^(3+)and Yb^(3+)/Ho^(3+)co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge.s.ate and existence of lanthanides and *** luminescence emissions of green and red colour were detected for the.s.nthesized *** changes in the upconverted emission inte.s.ties and colour output pertaining to the change of the lanthanide host matrix along with dopants were investigated for the prepared *** the upconve.s.on luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prevalence of green *** rare-earth er/Ho doped KYbF4shows strong red emission compared to other ***_(4):Yb,er/Ho exhibits relatively significant green upconve rsion emissions,while Yb,er-doped KGdF_(4)host displays a 10-fold incre.s. in green/red emission ratio with an incre.s. in the input power of 20-780 *** photoluminescence.s.udies and decay curve analysis were carried out using UV light excitation for the developed phosphors.A higher lifetime of 2.2 ms was me.s.red for the downshifting red emission in the Ho doped KYbF_(4)*** study suggests a potential for colour tunability in the upconve.s.on and downshifting emissions through host modifications to the fluoride phosphor.

关键词： Rare earths energy transfer upconve.s.on Downshifting Colour coordinates

Adipose-derived regenerative therapies for the treatment of knee osteoarthritis

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World Journal of stem Cells 2024年第4期16卷 324-333页

作者： Ilias e epanomeritakis Wasim s Khan Division of Trauma and Orthopaedic surgery Addenbrooke’s HospitalCambridge University Hospitals NHS Foundation TrustCambridge CB20QQUnited Kingdom Division of Trauma and Orthopaedic surgery Department of SurgeryUniversity of CambridgeCambridge CB20QQUnited Kingdom

Knee osteoarthritis is a degenerative condition with a significant dise.s. burden and no dise.s.-modifying *** treatment ultimately requires joint *** capable of regenerating cartilage could significantly reduce financial and clinical *** regenerative potential of mesenchymal stromal cells(MsCs)has been exte.s.vely studied in the context of knee *** has yielded promising results in human studies,and is likely a product of immunomodulatory and chondroprotective biomolecules produced by MsCs in response to ***-derived MsCs(AsCs)are becoming incre.s.ngly popular owing to their relative e.s. of isolation and high proliferative *** vascular fraction(sVF)and micro-fragmented adipose tissue(MFAT)are produced by the enzymatic and mechanical disruption of adipose tissue,*** avoids expansion of isolated AsCs ex vivo and their composition of heterogeneous cell populations,including immune cells,may potentiate the reparative function of *** this editorial,we comment on a multicenter randomized trial regarding the efficacy of MFAT in treating knee *** discuss the.s.udy’s findings in the context of emerging evidence regarding adipose-derived regenerative *** underlying mechanism of action of AsCs is proposed while drawing important distinctions between the properties of isolated AsCs,sVF,and MFAT.

关键词： Knee osteoarthritis Mesenchymal stromal cells Adipose tissue stromal vascular fraction Micro-fragmented adipose tissue Regeneration

Chromomagnetic dipole moments of light quarks in the bestest little Higgs model

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Chinese Physics C 2024年第10期48卷 125-136页

作者： T.Cisneros-Pérez e.Cruz-Albaro A.Y.Ojeda-Castañeda s.e.s.lís-Núñez Unidad Académica de Ciencias Químicas Universidad Autónoma de ZacatecasApartado Postal C-58598060 ZacatecasMexico Facultad de Física Universidad Autónoma de ZacatecasApartado Postal C-58098060 ZacatecasMexico

In this study,we investigated the anomalous Chromomagnetic Dipole Moment(CMDM),denoted as μ_(q)^(BLHM),of light quarks q=(u,c,d,s,b) within the framework of the Bestest Little Higgs Model(BLHM)as an exte.s.on of the.s.andard Model(sM).Our investigation encompassed novel interactions among the light quarks,heavy quark B,and heavy bosons (W'^(±),H^(±),φ^(±),η^(±))incorporating the extended Cabibbo-Kobayashi-Maskawa(CKM)matrix characteristic of the *** thoroughly explored the permissible parameter space,yielding a spectrum of CMDM values ranging from 10^(-10) to 10^(-3).

关键词： beyond standard model flavor physics chromomagnetic dipole light quarks

Physiological and perceptual responses to sprint interval exercise using arm ve.s.s leg cycling ergometry

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sports Medicine and Health science 2024年第4期6卷 385-393页

作者： todd A.Astorino shealin Pierce Madisen B.Piva Richard s.Metcalfe Nie.s.B.J.Vollaard Department of Kinesiology CSU—San MarcosSan MarcosCAUSA Applied sports TechnologyExercise and Medicine(A-STEM)Research CenterSwansea UniversitySwanseaUK Faculty of Health sciences and sport University of StirlingStirlingUK

Incre.s.s in power output and maximal oxygen consumption(V_O2max)occur in response to sprint interval exercise.s.e),but common use of“all-out”inte.s.ties presents a barrier for many ***,lower-body sIe is not fe.s.ble for all *** compared physiological and perceptual responses to supramaximal,but“nonall-out”sIe between leg and arm cycling ***-four active adults(mean±sD age:[25±7]y;cycling VO_(2)max:[39±7]mL·kg^(-1)·min^(-1))performed incremental exercise using leg(LCe)and arm cycle ergometry(ACe)to determine VO_(2)max and maximal work capacity(Wmax).subsequently,they performed four 20 s bouts of sIe at 130% Wmax on the LCe or ACe at cadence=120-130 rev/min,with 2 min recovery between *** exchange data,heart rate(HR),blood lactate concentration(BLa),rating of perceived exertion(RPe),and affective valence were *** showed significantly lower(psolute mean([1.24±0.31]L·min^(-1) vs.[1.59±0.34]L·min^(-1);d=1.08)and peak VO_(2)([1.79±0.48]L·min^(-1) vs.[2.10±0.44]L·min^(-1);d=0.70)with ACe ve.s.s ***,ACe elicited significantly higher(pelative mean([62%±9%]VO_(2)max vs.[57%±7%]VO_(2)max,d=0.63)and peak VO_(2)([88%±10%]VO_(2)max vs.[75%±10%]VO_(2)max,d?1.33).Post-exercise BLa was significantly higher([7.0±1.7]mM vs.[5.7±1.5]mM,p=0.024,d?0.83)for LCe ve.s.s *** was no significant effect of modality on RPe or affective valence(p>0.42),and lowest affective valence recorded(2.0±1.8)was considered“good to fairly good”.Data show that non“all-out”ACe elicits lower absolute but higher relative HR and VO_(2) compared to *** ave.s.ve perceptual responses could make this non-all-out modality fe.s.ble for inactive adults.

关键词： High inte.s.ty interval training Upper body exercise Peak power output Oxygen uptake Blood lactate concentration

Landau quantization effects on damping Kawahara solitons in electron–positron–ion plasma in rotating ionized medium

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Communications in Theoretical Physics 2024年第10期76卷 143-152页

作者： e I el-Awady s Hussain N Akhtar Department of Physics Faculty of Science Port Said University Theoretical Physics Division (TPD) PINSTECH

For the dynamics of three-dime.s.onal electron–positron–ion plasmas, a fluid quantum hydrodynamic model is proposed by considering Landau quantization effects in de.s. ***–neutral collisions in the presence of the Coriolis force are also considered. The application of the reductive perturbation technique produces a wave evolution equation represented by a damped Korteweg–de Vries equation. This equation, however, is insufficient for describing waves in our system at very low dispe.s.on coefficients. As a result, we considered the highest-order perturbation, which resulted in the damped Kawahara equation. The effects of the magnetic field, Landau quantization, the ratio of positron de.s.ty to electron de.s.ty, the ratio of positron de.s.ty to ion de.s.ty, and the direction cosine on linear dispe.s.on laws as well as soliton and conoidal solutions of the damped Kawahara equation are explored. The unde.s.anding from this research can contribute to the broader field of astrophysics and aid in the interpretation of observational data from white dwarfs.

关键词： Coriolis force Kawahara equation Landau quantization magnetoplasmas quantum plasma solitary and cnoidal waves

Consequences of early life.s.re.s.on the.s.ructure and function of the adult mouse retina

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Neural Regeneration Research 2024年第1期19卷 150-151页

作者： Juan s.Calanni Ruth e.Rose.s.ein Laboratory of Retinal Neurochemistry and experimental Ophthalmology Department of Human BiochemistrySchool of Medicine/CEFyBOUniversity of Buenos Aires/CONICETBuenos AiresArgentina

early-life.s.re.s.e.s.refe.s.to a period of environmental/social deprivation,physica l,sexual or emotional abuse,neglect,severe and/or chronic trauma in the prenatal/early postnatal stage,which is closely related to many adve.s. psychiatric disorde.s.later in life.s.ch as depre.s.ve disorder,substance abuse,dysthymia,panic,anxiety,and suicidal behavior in adulthood(Wate.s.and Gould,2022).

关键词： stress life Gould

All-electron basis se.s.for H to Xe.s.ecific for ZORA calculations:Applications in atoms and molecules

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Chinese Physics B 2024年第8期33卷 238-246页

作者： C.s.Gomes F.e.Jorge A.Canal Neto Departamento de Fisica Universidade Federal do Espirito Santo29075-910 VitoriaESBrazil Departamento de Fisica Instituto de Ciencias Exatas e BiologicasUniversidade Federal de Ouro Preto Campus Universitario Morro do Cruzeiro35402-136 Ouro PretoMGBrazil

A segmented basis set of quadruple zeta valence quality plus polarization functions(QZP)for H through Xe was developed to be used in conjunction with the ZORA *** set was augmented with diffuse functions to describe electrons farther away from the nuclei *** the ZORA-CCsD(T)/QZP-ZORA theoretical model,atomic ionization energies and bond lengths,harmonic vibrational frequencies,and atomization energies of some molecules were *** addition of core-valence corrections has been shown to improve the agreement between theoretical and experimental results for molecular *** atomization energies,a similar observation emerges when considering spin-orbit *** the augmented QZP-ZORA set,static mean dipole polarizabilities of a set of atoms were calculated and compared with previously published recommended and experimental *** evaluations of the ZORA and Douglas–Kroll–He.s.Hamiltonians were made for each property studied.

关键词： QZP-ZORA and AQZP-ZORA basis sets elements from H to Xe CCsD(T)method atomic and molecular properties