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regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 193-208页

作者： k.mUHAmmAD m.SArFrAZ Department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(mHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in mATHEmATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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modeling oblique load carrying capacity of batter pile groups using neural network,random forest regression and m5 model tree

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 674-685页

作者： Tanvi SINGH mahesh PAL V.k.ArOrA Department of Civil Engineering National Institute of TechnologyKurukshetraHaryana 136119India

m5 model tree,random forest regression(rF)and neural network(NN)based modelling approaches were used to predict oblique load carrying capacity of batter pile groups using 247 laboratory experiments with smooth and rough pile *** length(L),angle of oblique load(a),sand density(ρ),number of batter piles(B),and number of vertical piles(V)as input and oblique load(Q)as output was *** suggest improved performance by rF regression for both pile groups.m5 model tree provides simple linear relation which can be used for the prediction of oblique load for field data *** developed using rF regression approach with smooth pile group data was found to be in good agreement for rough piles *** based approach was found performing equally well with both smooth and rough *** analysis using all three modelling approaches suggest angle of oblique load(a)and number of batter pile(B)affect the oblique load capacity for both smooth and rough pile groups.

关键词： batter piles oblique load test neural network m5 model tree random forest regression ANOVA

Synthesis and characterization of organomodified Na-mmT using cation and anion surfactants

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Frontiers of Chemistry in China 2011年第2期6卷 153-158页

作者： k.r.vishnu mahesh H.N.Narasimha mUrTHY B.E.kUmArASWAmY N.rAGHAVENDrA r.SrIDHAr m.krISHNA Niranjan PATTAr ratna PAL B.S.Sherigara Department of P.G Studies and research in Industrial Chemistry Kuvempu UniversityShankaraghattaShimoga 577451India Department of mechanical Engineering R V College of EngineeringBangalore 560059India

The Sodium montmorillonite(Na-mmT)is not susceptible to polymer due to its organophilic character and low basal *** primary objective of this study was to improve Na-mmT platelets separation by organically modifying it with cation and anion exchanges using Cetyl trimethyl ammonium bromide(CTAB)and Sodium dodecyl sulfate(SDS)*** spacing,presence of functional groups,Zetapotential with particle size analysis and thermal stability of the Organomodified Na-mmT(OmmT)were characterized using XrD,FTIr,zeta-potential analyzer and TGA *** basal spacing of CTAB modified OmmTincreased to 19.5Åfrom 11.0Åwhich corresponds to the basal spacing of *** SDS modified OmmT did not show any increase in the basal *** spectra of CTAB modified Na-mmT illustrated the attachment of CTAB functional groups to Na-mmT,while the same was absent in the case of SDS modified *** zeta-potential of Na-mmT shifted from–24.88 mV to 15.66 mV in the case of CTAB modified Na-mmTand 12.49 mV for SDS modified Na-mmT,indicating a greater surface potential of the modified *** TGA showed greater weight loss for CTAB modified Na-mmT than that for Na-mmT,indicating the effective Na+ion exchange with alkyl amines.

关键词： Na-mmT CTAB SDS XrD FTIr zetapotential

On examining the predictive capabilities of two variants of the PINN in validating localized wave solutions in the generalized nonlinear Schr?dinger equation

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Communications in Theoretical Physics 2024年第11期76卷 161-174页

作者： k Thulasidharan N Sinthuja N vishnu Priya m Senthilvelan Department of Physics Vellore Institute of TechnologyVellore-632014TamilnaduIndia Department of Physics Anna UniversityChennai-600025TamilnaduIndia Department of mathematics Indian Institute of ScienceBangalore 560012KarnatakaIndia Department of Nonlinear Dynamics Bharathidasan UniversityTiruchirappalli-620024TamilnaduIndia

We introduce a novel neural network structure called strongly constrained theory-guided neural network(SCTgNN),to investigate the behaviour of the localized solutions of the generalized nonlinear Schr?dinger(NLS)*** equation comprises four physically significant nonlinear evolution equations,namely,the NLS,Hirota,Lakshmanan-Porsezian-Daniel and fifth-order NLS *** generalized NLS equation demonstrates nonlinear effects up to quintic order,indicating rich and complex dynamics in various fields of *** combining concepts from the physics-informed neural network and theory-guided neural network(TgNN)models,the SCTgNN aims to enhance our understanding of complex phenomena,particularly within nonlinear systems that defy conventional *** begin,we employ the TgNN method to predict the behaviour of localized waves,including solitons,rogue waves and breathers,within the generalized NLS *** then use the SCTgNN to predict the aforementioned localized solutions and calculate the mean square errors in both the SCTgNN and TgNN in predicting these three localized *** findings reveal that both models excel in understanding complex behaviour and provide predictions across a wide variety of situations.

关键词： generalized nonlinear Schr?dinger equation soliton rogue waves breathers SCTgNN TgNN

mechanical behavior of organo-modified Indian bentonite nanoclay fiber-reinforced plastic nanocomposites

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Frontiers of materials Science 2013年第4期7卷 396-404页

作者： N. rAGHAVENDrA H. N. NArASImHA mUrTHY m. krISHNA k. r. vishnu mahesh r. SrIDHAr S. FIrDOSH G. ANGADI S. C. SHArmA Center for manufacturing and research Technology Utilization R. V. College Campus Bangalore 560059 Karnataka India Department of mechanical Engineering R. V. College of Engineering Bangalore 560059 Karnataka India Department of Chemistry ACS College of Engineering Bangalore 560074 Karnataka India Tumkur University Tumkur 572103 Karnataka India

The aim of the research was to examine the influence of organo-modified Indian bentonite （IB） nanoclay dispersed in vinyisster on the mechanical properties of nanoclaylvinylesterlglass nanocomposres. Nanoclay was organically modified using cationic surfactant hexadecyltrimethylammonium bromide （HDTmA-Br） by cation exchange method and dispersed in vinylester using ultrasonication and twin screw extrusion. XrD of nanoclaylvinylester revealed exfoliaUon at 4 wt.% nanoclay indicating uniform dispersion in the polymer. DSC results showed improvement in glass transition temperature by 22.3% in 4 wt.% nanoclaylvinylester/glass when compared with that of vinylester/glass. Nanoclay/vinylester/glass with 4 wt,% nanoclay showed 29.23%, 23.84% and 60.87% improvement in ultimate tensile strength （UTS）, fiexural strength （FS） and interlaminar shear strength （ILSS） respectively when compared with those of vinylester! glass. The mode of tensile failure examined by SEm showed no agglomeration of nanoclay in 4 wt.% nanoclayNinylester/glass specimens.

关键词： Indian bentonite (IB) ultrasonication twin-screw extrusion mechanical property

mechanical, thermal and fire nanoclay/vinylester retardation behaviours of nanocomposites

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Frontiers of materials Science 2011年第4期5卷 401-411页

作者： k. r. vishnu mahesh H. N. NArASImHA mUrTHY B. E. kUmArA SWAmY S. C. SHArmA r. SrIDHAr Niranjan PATTAr m. krISHNA B. S. SHErIGArA Department of P. G. Studies and research in Industrial Chemistry Kuvempu University Shankaraghatta Shimoga 577451 Karnataka India Department of mechanical Engineering R. V. College of Engineering Bangalore 560059 Karnataka India Tumkur University Tumkur 572103 Karnataka India

The dispersion of montmorillonite （mmT） in vinylester for preparing nanoclay/vinylester gel coat was reported. Two sets of mmT/vinylester specimens, namely Type I and Type 2, were prepared for comparative studies. Type I specimens were prepared using ultrasonication only, and Type 2 specimens were prepared using both ultrasonication and twin-screw extrusion. According to XrD and TEm results, Type 2 specimens showed lower levels of nanoclay agglomeration and higher levels o! exfoliation. DSC results showed that the glass transition temperatures of Type 2 specimens are higher than those of Type 1 specimens. TGA results showed that the residual weight of 4 wt.% mmT/vinylester of Type 1 was 7.38%, while the corresponding value of Type 2 was 13,5%, indicating lower thermal degradation in the latter. mmTt vinylester/glass and mmT/vinylester/carbon specimens were fabricated and tested for mechanical and fire retardation behaviours. Type 2 based nanocomposite laminates showed greater values of ultimate tensile strength, flexural strength, interlaminar shear strength, impact strength, horizontal burning rate, and vertical burning rate than Type 1 based laminates. SEm images of tensile fractured surfaces revealed that Type 2 based laminates have no or less agglomeration of nanoclay than Type 1 based laminates.

关键词： twin-screw extrusion montmorillonite nanoclay nanocomposite vinylester

Anatomy of the 2009 Fiordland earthquake(m_w 7.8),South Island,New Zealand

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Geoscience Frontiers 2011年第1期2卷 17-22页

作者： P.mahesh Bhaskar kundu J.k.Catherine V.k.Gahalaut National Geophysical research Institute Council of Scientific and Industrial ResearchHyderabad 500007India

We have analyzed the July 15, 2009, Fiordland earthquake （mw 7.8）, which occurred in the southwestern part of the South Island of New Zealand. This thrust-related earthquake in the southern Fiordland subduction zone is the largest New Zealand earthquake in the past 80 years. We have constrained a rupture model for this earthquake using coseismic offsets derived from the continuous geodetic network （Global Positioning System） of the New Zealand Institute of Geological and Nuclear Sciences （GNS Science）. Our analysis concludes that this earthquake significantly increased the Coulomb stress on the overriding plate, particularly on the offshore portion of the Alpine fault.

关键词： Fiordland subduction zone Global PositioningSystem Coulomb stress Alpine fault

Heterogeneity of mature oligodendrocytes in the central nervous system

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Neural regeneration research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam m.r.Groh moein Yaqubi Qiao-Ling Cui Jo Anne Stratton G.r.Wayne moore Jack P.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Department of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by robertson and río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus rNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity from temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics promise a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

Optical and structural properties of highly porous shell structured Fe doped TiO_2 thin films

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rare metals 2014年第5期33卷 578-582页

作者： C.S.Naveen P.raghu H.m.mahesh k.Narasimha rao r.rakesh kumar A.r.Phani Department of Electronic Science Bangalore UniversityJnanabharathi Department of Instrumentation and Applied Physics Indian Institute of Science Nano-research for Advanced materials and Technologies (Nano-RAM Technologies)

TiO2thin films with 0.2 wt%, 0.4 wt%, 0.6wt%, and 0.8 wt% Fe were prepared on glass and silicon substrates using sol–gel spin coating technique. The optical cut-off points are increasingly red-shifted and the absorption edge is shifted over the higher wavelength region with Fe content increasing. As Fe content increases, the optical band gap decreases from 3.03 to 2.48 eV whereas the tail width increases from 0.26 to 1.43 eV. The X-ray diffraction（XrD） patterns for doped films at 0.2 wt% and0.8 wt% Fe reveal no characteristic peaks, indicating that the film is amorphous whereas undoped TiO2exhibits（101） orientation with anatase phase. Thin films of higher Fe content exhibit a homogeneous, uniform, and nanostructured highly porous shell morphology.

关键词： Fe TiO2 Porous shell Sol–gel