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Nonlinear elastic constitutive relations of residually stressed composites with stiff curved fibres

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Applied mathematics and mechanics(English Edition) 2022年第10期43卷 1515-1530页

作者： m.H.b.m.Shariff J.merodio R.bustamante Department of mathematics Khalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Departamento de matemática Aplicada a las TIC ETS de Ingeniería de Sistemas InformaticosUniversidad Politecnica de MadridMadrid28031Spain Departamento de Ingeniería mecánica Universidad de ChileBeauchef 851Santiago CentroSantiago8370448Chile

mechanical models of residually stressed fibre-reinforced solids,which do not resist bending,have been developed in the literature.However,in some residually stressed fibre-reinforced elastic solids,resistance to fibre bending is significant,and the mechanical behavior of such solids should be investigated.Hence,in this paper,we model the mechanical aspect of residually stressed elastic solids with bending stiffness due to fibre curvature,which up to the authors’knowledge has not been mechanically modeled in the past.The proposed constitutive equation involves a nonsymmetric stress and a couple-stress tensor.Spectral invariants are used in the constitutive equation,where each spectral invariant has an intelligible physical meaning,and hence they are useful in experiment and analysis.A prototype strain energy function is proposed.moreover,we use this prototype to give results for some cylindrical boundary value problems.

关键词： fibre-reinforced solid residual stress bending stiffness spectral invariant second gradient finite elasticity

Effect of periodic heat transfer on the transient thermal behavior of a convective-radiative fully wet porous moving trapezoidal fin

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Applied mathematics and mechanics(English Edition) 2023年第4期44卷 653-668页

作者： b.J.GIREESHA m.L.KEERTHI Department of PG Studies and Research in mathematics Kuvempu UniversityShankaraghatta 577451India

A moving trapezoidal profiled convective-radiative porous longitudinal fin wetted in a single-phase fluid is considered in the current article.The periodic variation in the fin base temperature is taken into account along with the temperature sensitive thermal conductivity and convective heat transfer coefficients.The modeled problem,which is resolved into a non-linear partial differential equation(PDE),is made dimensionless and solved by employing the finite difference method(FDm).The results are displayed through graphs and discussed.The effects of amplitude,frequency of oscillation,wet nature,Peclet number,and other relevant quantities on the distribution of temperature through the fin length and with the dimensionless time are investigated.It is deciphered that the periodic heat transfer gives rise to the wavy nature of the fin thermal profile against time.The analysis is beneficial in the design of fin structures for applications like solar collectors,space/airborne applications,and refrigeration industries.

关键词： convection fully wet porous fin trapezoidal profile moving fin unsteady periodic thermal condition

magnetohydrodynamics hemodynamics hybrid nanofluid flow through inclined stenotic artery

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Applied mathematics and mechanics(English Edition) 2023年第3期44卷 459-476页

作者： b.K.SHARmA R.GANDHI T.AbbAS m.m.bHATTI Department of mathematics Birla Institute of Technology and SciencePilani 333031India Department of mathematics Division of Science and TechnologyUniversity of EducationLahore 54770Pakistan College of mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina

The present study aims to perform computational simulations of twodimensional(2D)hemodynamics of unsteady blood flow via an inclined overlapping stenosed artery employing the Casson fluid model to discuss the hemorheological properties in the arterial region.A uniform magnetic field is applied to the blood flow in the radial direction as the magneto-hemodynamics effect is considered.The entropy generation is discussed using the second law of thermodynamics.The influence of different shape parameters is explored,which are assumed to have varied shapes(spherical,brick,cylindrical,platelet,and blade).The Crank-Nicolson scheme solves the equations and boundary conditions governing the flow.For a given critical height of the stenosis,the key hemodynamic variables such as velocity,wall shear stress(WSS),temperature,flow rate,and heat transfer coefficient are computed.

关键词： overlapping stenosis hematocrit-dependent viscosity Au-Cu/blood hybrid nanofluid entropy generation shape effect

The new wave of p75 neurotrophin receptor targeted therapies

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Neural Regeneration Research 2022年第1期17卷 95-96页

作者： Amanda m.Crooks Rick b.meeker UNC School of medicine University of North CarolinaChapel HillNCUSA(Crooks AM)Department of NeurologyUniversity of North CarolinaChapel HillNCUSA

Neurotrophins have been recognized for decades for their beneficial effects on growth,survival,and maintenance in the central nervous system,all of which suggest potential therapeutic utility.Although understanding and harnessing the activity of neurotrophins has proven difficult,the past several years have seen significant strides in the development of deliverable therapies that modulate neurotrophin activity(Shen et al.,2019;Yang et al.,2020;Xie et al.,2021).These recent studies have primarily focused on the multifunctional p75 neurotrophin receptor(p75NTR)which is upregulated in central nervous system disease and injury,thus offering a unique target for intervention.

关键词： al. therapies p75

User scheduling and power allocation for downlink multi-cell multi-carrier NOmA systems

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Digital Communications and Networks 2023年第1期9卷 252-263页

作者： Abuzar b.m.Adam Xiaoyu Wan Zhengqiang Wang School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China

In Non-Orthogonal multiple Access(NOmA),the best way to fully exploit the benefits of the system is the efficient resource allocation.For the NOmA power domain,the allocation of power and spectrum require solving the mixed-integer nonlinear programming NP-hard problem.In this paper,we investigate user scheduling and power allocation in multi-Cell multi-Carrier NOmA(mCmC-NOmA)networks.To achieve that,we consider Weighted Sum Rate maximization(WSRm)and Weighted Sum Energy Efficiency maximization(WSEEm)problems.First,we tackle the problem of user scheduling for fixed power using Fractional Programming(FP),the Lagrange dual method,and the decomposition method.Then,we consider Successive Pseudo-Convex Approximation(SPCA)to deal with the WSRm problem.Finally,for the WSEEm problem,SPCA is utilized to convert the problem into separable scalar problems,which can be parallelly solved.Thus,the Dinkelbach algorithm and constraints relaxation are used to characterize the closed-form solution for power allocation.Extensive simulations have been implemented to show the efficiency of the proposed framework and its superiority over other existing schemes.

关键词： Weighted sum rate Weighted energy efficiency Non-orthogonal multiple access Successive pseudo-convex approximation Fractional programming

Performance Enhancement of PV based boost Cascaded Fifteen Level Inverter for AC Loads

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Computer Systems Science & Engineering 2022年第7期42卷 165-181页

作者： m.P.Viswanathan b.Anand Department of Electrical and Electronics Engineering Hindusthan College of Engineering and TechnologyCoimbatore641032India

In this research work,single-stageﬁfteen levels cascaded DC-interface converter(CDDCLC)is proposed for sun arranged photovoltaic technology(PV)applications.The proposed geography is joined with help DC chopper and H-associate inverter to upgrade the power converter to accomplish the diminished harmonic proﬁle.In assessment with the customary inverter structures,the proposed system is used with diminished voltage stress,decreased switch count and DC source tally.The proposed research work with cascaded DC link conver-ter design requires three DC sources for combiningﬁfteen-level AC output.This investigation structure switching technique is phase opposition and disposition pulse width modulation technique(POPD)which results in improved quality of obtained output AC power with 6.73%THD and also determinedly recommended for power converters used in UPS and drive applications since it is extremely affordable.A simulation and prototype model ofﬁfteen-level CDDCLC system is deployed and its performance is analyzed for various operating conditions.

关键词： Cascaded DClinkconverter(CDDCLC) modified phaseopposition and disposition(mPOPDPWm) photovoltaic(PV) DCinterfaceboostconverter

New turbulence modeling for air/water stratified flow

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Journal of Ocean Engineering and Science 2020年第1期5卷 55-67页

作者： m.Ghafari m.b.Ghofrani Department of Energy Engineering Sharif University of TechnologyAzadi Ave.TehranIran

The prediction of interfacial turbulence characteristics is one of the still challenging of two-phase stratified flow.The evaluation of some important parameters such as interfacial heat transfer coefficient based on turbulence kinetic energy and turbulence dissipation rate in some models,intensifies the importance of turbulence flow correct simulation.High gradient of velocity and turbulence kinetic energy at the interface of two-phase stratified flow leads to a major overestimation or underestimation of flow characteristics without any special treatment.Consideration of a source function of turbulence eddy frequency at the interface is one of the common solution employed in past researches.Although this solution remedies some shortcomings of traditional methods in smooth stratified flow,its application in wavy stratified flow needs the other modifications.The examination of turbulence characteristics near the free surface reveals that,in addition to turbulence eddy frequency,the other source function of turbulence kinetic energy should be considered near the free interface.So,a new source function of turbulence kinetic energy is proposed at the interface based on flow condition.This new method has been employed for Fabre et al.(1987)experiment designed for air/water stratified flow.The results of simulation have a good agreement with experimental data and turbulence characteristic can be captured near the free surface.

关键词： Stratified flow Turbulence model Turbulence kinetic energy Source function

Dynamics of high-frequency modulated waves in a nonlinear dissipative continuous bi-inductance network

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Chinese Physics b 2021年第6期30卷 193-205页

作者： S m Ngounou F b Pelap Unitéde Recherche de mécanique et de modélisation des Systèmes Physiques(UR-2 mSP) Facultédes SciencesUniversitéde DschangBP 69 DschangCameroun Unitéde Recherche de matière Condensée d'Electronique et de Traitement du Signal(UR-mACETS) Facultédes SciencesUniversitéde DschangBP 67 DschangCameroun

This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coefficient whose evolution in terms of the carrier wave frequency is checked. There appears that the dissipation coefficient increases with the carrier wave frequency. In the linear limit and for high frequency waves, study of the asymptotic behavior of plane waves reveals the existence of two additional regions in the dispersion curve where the modulational phenomenon is observed compared to the lossless line. based on the multiple scales method exploited in the continuum approximation using an appropriate decoupling ansatz for the voltage of the two different cells, it appears that the motion of modulated waves is described by a dissipative complex Ginzburg–Landau equation instead of a Korteweg–de Vries equation. We also show that this amplitude wave equation admits envelope and hole solitons in the high frequency mode. From basic sources, we design a programmable electronic generator of complex signals with desired characteristics, which delivers signals exploited as input waves for all our numerical simulations. These simulations are performed in the LTspice software that uses realistic components and give the results that corroborate perfectly our analytical predictions.

关键词： dissipative bi-inductance network high-frequency mode continuous approximation dissipative complex Ginzburg–Landau equation programmable electronic generator LT-Pspice observations

morphophysiological Diversity and Haplotype Analysis of Saltol QTL Region in Diverse Rice Landraces for Salinity Tolerance

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Rice science 2023年第4期30卷 306-320,I0010-I0012页

作者： b.m.LOKESHKUmAR S.L.KRISHNAmURTHY Suman RATHOR Arvinder Singh WARRIACH N.m.VINAYKUmAR b.m.DUSHYANTHAKUmAR Parbodh Chander SHARmA Division of Crop Improvement Central Soil Salinity Research InstituteKarnal-132001HaryanaIndia Department of biotechnology Kuvempu UniversityShankaraghattaShimvamogga-577451KarnatakaIndia Department of Genetics and Plant breeding University of Agricultural and Horticultural ScienceShimvamogga-577204KarnatakaIndia

Rice is sensitive to salinity stress at both the seedling and reproductive stages.The present study used 145 rice genotypes comprising of 100 landraces and 45 advanced breeding lines collected from different regions of India.These genotypes were evaluated in hydroponics under control[electrical conductivity(ECe)~1.2 dS/m]and saline(ECe~10.0 dS/m)environments along with susceptible(IR29)and tolerant(FL478)checks.The stress susceptibility index for eight morphophysiological traits was estimated.Analysis of variance showed significant differences among the genotypes for all the parameters studied in control,stress and relative stress conditions.We identified 3 landraces(Kuttimanja,Tulasimog and IET-13713I)as tolerant and 14 lines as moderately tolerant to salt stress.Strong correlations in the morphological(root and shoot lengths)and physiological traits(shoot Na^(+),Ca^(2+)and mg^(2+)contents,and Na^(+)/K^(+)ratio)were observed under all the conditions.The hierarchical cluster analysis grouped the genotypes into five clusters,among which cluster Ⅱ comprised salt-tolerant lines.Haplotyping of Saltol region using 11 simple sequence repeat markers on 17 saline tolerant and moderately tolerant lines was conducted.markers AP3206F,Rm10793 and Rm3412b,located close to SKC1 gene(11.23‒12.55 mb),displayed diverse allelic variations and they were not related to the FL478 type.In this region,tolerant lines like Kuttimanja,IET-13713I and Tulasimog have new alleles.As a result,these lines may be suitable candidates for novel genomic regions governing rice salinity tolerance.Salt-tolerance ability of Kuttimanja,Tulasimog and IET-13713I was validated in two years in three salinity stress environments.These promising lines can be used in breeding programs to broaden the genetic base of salinity tolerance in rice,and it may help to dissect key genomic regions responsible for salinity tolerance.

关键词： haplotype salinity tolerance rice Saltol diversity SKC1 gene