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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.

关键词： Nanofluidics

A brief review on/μSR studies of unconventional Fe-and Cr-based superconductors

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Science China(Physics,Mechanics & Astronomy) 2018年第12期61卷 3-24页

作者： A.bhattacharyya D.T.Adroja M.Smidman V.k.Anand ISIS Facility Rutherford Appleton LaboratoryChiltonDidcot OxonOX11OQXUK Department of Physics Ramakrishna Mission Vivekananda Educational and Research InstituteHowrah 711202India Highly Correlated Matter Research Group Physics DepartmentUniversity of JohannesburgAuckland Park 2006South Africa Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Berlin D-14109Germany

Muon spin relaxation/rotation(μSR) is a vital technique for probing the superconducting gap structure, pairing symmetry and time reversal symmetry breaking, enabling an understanding of the mechanisms behind the unconventional superconductivity of cuprates and Fe-based high-temperature superconductors, which remain a puzzle. Very recently double layered Fe-based superconductors having quasi-2 D crystal structures and Cr-based superconductors with a quasi-1D structure have drawn considerable attention. Here we present a brief review of the characteristics of a few selected Fe-and Cr-based superconducting materials and highlight some of the major outstanding problems, with an emphasis on the superconducting pairing symmetries of these materials. We focus on μSR studies of the newly discovered superconductors ACa_2Fe_4As_4F_2(A = k, Rb, and Cs), ThFeAsN, and A_2Cr_3As_3(A = k, Cs), which were used to determine the superconducting gap structures, the presence of spin fluctuations, and to search for time reversal symmetry breaking in the superconducting states. We also briefly discuss the results of μSR investigations of the superconductivity in hole and electron doped BaFe_2As_2.

关键词： unconventional superconductors iron-based superconductors Cr-based superconductors superconducting pairing symmetry time reversal symmetry muon spin rotation/relaxation

Plasmonic-enhanced electrochemical detection of volatile biomarkers with gold functionalized TiO_2 nanotube arrays

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Journal of Materials Science & Technology 2018年第6期34卷 905-913页

作者： Dhiman bhattacharyya Pankaj kumar York R.Smith Swomitra k.Mohanty Mano Misra Department of Metallurgical Engineering University of Utah Department of Chemical Engineering University of Utah

Titania nanotubular arrays （TNA） synthesized via electrochemical anodization is a stable and versatile material, widely studied for photocatalytic and sensing applications, whereas nano-sized gold particles are a known plasmonic material. Semiconductor-metal nanocomposites in isolated, embedded, or encapsulated form, when irradiated with proper light frequency can exhibit localized surface plasmon resonance （LSPR） effect. This effect can result in improved light adsorption and electrical properties of a material. In this study, we report the enhanced visible light photo-response of LSPR induced volatile organic biomarker vapor sensing at room temperature using a Au-embedded TNA electrochemical sensor. Two mechanisms are proposed. One based on classical physics （band theory）, which explains operation under non-irradiated conditions. The second mechanism is based on the coupling of classical and quantum physics （molecular orbitals）, and explains sensor operation under irradiated conditions.

关键词： TiO2 nanotube arrays Au particles Surface plasmon resonance Electrochemical sensor

CFD approach to modelling, hydrodynamic analysis and motion characteristics of a laboratory underwater glider with experimental results

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Journal of Ocean Engineering and Science 2017年第2期2卷 90-119页

作者： Yogang Singh S.k.bhattacharyya V.G.Idichandy Department of Ocean Engineering Indian Institute of Technology-MadrasChennaiIndia

Underwater gliders are buoyancy propelled vehicle which make use of buoyancy for vertical movement and wings to propel the glider in forward *** underwater gliders are a patented technology and are manufactured and marketed by *** this study,we validate the experimental lift and drag characteristics of a glider from the literature using Computational fluid dynamics(CFD)*** approach is then used for the assessment of the steady state characteristics of a laboratory glider designed at Indian Institute of Technology(IIT)*** behaviour and lift and drag force distribution at different angles of attack are studied for Reynolds numbers varying from 10^(5) to 10^(6) for NACA0012 wing *** state variables of the glider are the velocity,gliding angle and angle of attack which are simulated by making use of the hydrodynamic drag and lift coefficients obtained from *** effect of the variable buoyancy is examined in terms of the gliding angle,velocity and angle of *** model of glider is developed from the final design asserted by *** model is used for determination of static and dynamic properties of an underwater glider which were validated against an equivalent CAD model and simulation results obtained from equations of motion of glider in vertical plane *** the literature,only empirical approach has been adopted to estimate the hydrodynamic coefficients of the AUG that are required for its trajectory *** this work,a CFD approach has been proposed to estimate the hydrodynamic coefficients and validated with experimental data.A two-mass variable buoyancy engine has been designed and *** equations of motion for this two-mass engine have been obtained by modifying the single mass version of the equations described in the *** objectives of the present study are to understand the glider dynamics adopting a CFD approach,fabricate the glider and its variabl

关键词： AUG CFD Drag Glider Underwater glider Variable buoyancy engine

Electrical conductivity of the graphene nanoplatelets coated natural and synthetic fibres using electrophoretic deposition technique

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International Journal of Smart and Nano Materials 2018年第3期9卷 167-183,I0002页

作者： Hamid Souri Debes bhattacharyya Centre for Advanced Composite Materials Department of Mechanical EngineeringThe University of AucklandAucklandNew Zealand

Herein,electrically conductive natural and synthetic yarns through electrophoretic deposition(EPD)technique were fabricated.A parametric study on the conductivity enhancement of the yarns is carried out by Taguchi *** this method,the desirable conditions are determined by studying the effects of important parameters on the electrical conductivity of the yarns in the EPD coating *** on the L18 design of experiments table,the preferred combination of factors to obtain the highest electrical conductivity of the yarns is found by Taguchi *** addition,the Pareto ANOVA analysis is conducted to identify the major contributing factors on the electrical conductivity of the *** techniques,such as scanning electron microscopy(SEM),Fourier transformed infrared spectroscopy(FTIR)in attenuated total reflectance(ATR)mode,and thermogravimetric analysis(TGA)are utilised for better understanding the microstructure and physical *** powered by only 3 V,the maximum temperature of a Joule heated conductive sample based on natural fibre yarns reached 102°C in less than 25 s.

关键词： Graphene nanoplatelets electrical conductivity natural fibres electrothermal behaviour Taguchi method

Hybrid intelligence approach for multi-load level reactive power planning using VAR compensator in power transmission network

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Protection and Control of Modern Power Systems 2021年第1期6卷 330-346页

作者： Nihar karmakar Biplab bhattacharyya Department of Electrical Engineering Indian Institute of Technology(ISM)Dhanbad826004India

This paper formulates and solves a techno-economic planning problem of reactive power (VAR) in power transmission systems under loadings. The objective of the proposed research work is to minimize the combination of installation cost of reactive power sources, power losses and operational cost while satisfying technical constraints. Initially, the positions for the placement of reactive power sources are determined technically. Different cost components such as VAR generation cost, line charging cost etc. are then added in the total operating cost in a most economical way. Finally, the optimal parameter setting subjected to reactive power planning (RPP) is obtained by taking advantages of hybrid soft computing techniques. For the justification of the efficiency and efficacy of the proposed approach the entire work is simulated on two inter-regional transmission networks. To validate the robustness and ease of the soft computing techniques in RPP the responses of benchmark functions and statistical proof are provided simultaneously.

关键词： Active power loss Reactive power planning Hybrid algorithm Line charging Operating cost

Nil Clean Graphs of Rings

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Algebra Colloquium 2017年第3期24卷 481-492页

作者： Dhiren kumar Basnet Jayanta bhattacharyya Department of Mathematical Sciences Tezpur University Napaazn Tezpur-784028 Assam India

In this article, we define the nil clean graph of a ring R. The vertex set is the ring R, and two ring elements a and b are adjacent if and only if a ＋ b is nil clean in R. Graph theoretic properties like the girth, ... 详细信息

关键词： nil clean ring weak nil clean ring nil clean graph

Analytic solution for magnetohydrodynamic boundary layer flow of Casson fluid over a stretching/shrinking sheet with wall mass transfer

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Chinese Physics B 2013年第2期22卷 314-319页

作者： krishnendu bhattacharyya Tasawar Hayat Ahmed Alsaedi Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia Department of Mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

In this analysis,the magnetohydrodynamic boundary layer flow of Casson fluid over a permeable stretching/shrinking sheet in the presence of wall mass transfer is *** similarity transformations,the governing equations are converted to an ordinary differential equation and then solved *** introduction of a magnetic field changes the behavior of the entire flow dynamics in the shrinking sheet case and also has a major impact in the stretching sheet *** similarity solution is always unique in the stretching case,and in the shrinking case the solution shows dual nature for certain values of the *** stronger magnetic field,the similarity solution for the shrinking sheet case becomes unique.

关键词： magnetohydrodynamic boundary layer Casson fluid stretching/shrinking sheet wall mass transfer analytic solution

Regulatory role of long non coding RNAs (lncRNAs) in neurological disorders:From novel biomarkers to promising therapeutic strategies

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Asian Journal of Pharmaceutical Sciences 2021年第5期16卷 533-550页

作者： Nirjhar bhattacharyya Vedansh Pandey Malini bhattacharyya Abhijit Dey Department of Life Sciences Presidency UniversityKolkataIndia

Long non coding RNAs(lncRNAs) are non-protein or low-protein coding transcripts that contain more than 200 nucleotides. They representing a large share of the cell’s transcriptional output, demonstrate functional attributes viz. tissue-specific expression, determination of cell fate, controlled expression, RNA processing and editing, dosage compensation, genomic imprinting, conserved evolutionary traits etc. These long non coding variants are well associated with pathogenicity of various diseases including the neurological disorders like Alzheimer’s disease, schizophrenia, Huntington’s disease, Parkinson’s disease etc. Neurological disorders are widespread and there knowing the underlying mechanisms become crucial. The lncRNAs take part in the pathogenesis by a plethora of mechanisms like decoy, scaffold, mi-RNA sequestrator, histone modifiers and in transcriptional interference. Detailed knowledge of the role of lncRNAs can help to use them further as novel biomarkers for therapeutic aspects. Here, in this review we discuss regulation and functional roles of lncRNAs in eight neurological diseases and psychiatric disorders, and the mechanisms by which they act. With these, we try to establish their roles as potential markers and viable diagnostic tools in these disorders.

关键词： Non coding rnas Alzheimer’s disease Huntington’s disease Parkinson’s disease Schizophrenia Regulatory