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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

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

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

Exact solutions for the flow of Casson fluid over a stretching surface with transpiration and heat transfer effects

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Chinese Physics B 2013年第11期22卷 356-361页

作者： Swati Mukhopadhyay Krishnendu bhattacharyya Tasawar Hayat Department of Mathematics The University of Burdwan Department of Mathematics Quaid-i-Azam University 45320 Department of Mathematics Faculty of Science King Abdulziz University

The effects of transpiration on forced convection boundary layer non-Newtonian fluid flow and heat transfer toward a linearly stretching surface are reported. The flow is caused solely by the stretching of the sheet in its own plane with a velocity varying linearly with the distance from a fixed point. The constitutive relationship for the Casson fluid is used. The governing partial differential equations corresponding to the momentum and energy equations are converted into non-linear ordinary differential equations by using similarity transformations. Exact solutions of the resulting ordinary differential equations are obtained. The effect of increasing Casson parameter, i.e., with decreasing yield stress （the fluid behaves as a Newtonian fluid as the Casson parameter becomes large）, is to suppress the velocity field. However, the temperature is enhanced as the Casson parameter increases. It is observed that the effect of transpiration is to decrease the fluid velocity as well as the temperature. The skin-friction coefficient is found to increase as the transpiration parameter increases.

关键词： stretching surface transpiration Casson fluid heat transfer

Unsteady boundary layer flow and heat transfer over an exponentially shrinking sheet with suction in a copper-water nanofluid

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Journal of Central South University 2015年第12期22卷 4856-4863页

作者： Aurang Zaib Krishnendu bhattacharyya Sharidan Shafie Department of Mathematical Sciences Federal Urdu University of ArtsScience & Technology Department of Mathematics The University of Burdwan Department of Mathematical Sciences Faculty of ScienceUniversiti Teknologi Malaysia

An analysis of unsteady boundary layer flow and heat transfer over an exponentially shrinking porous sheet filled with a copper-water nanofluid is *** is treated as a base *** the investigation,non-uniform mass suction through the porous sheet is *** Keller-box method the transformed equations are solved *** results of skin friction coefficient,the local Nusselt number as well as the velocity and temperature profiles are presented for different flow *** results showed that the dual non-similar solutions exist only when certain amount of mass suction is applied through the porous sheet for various unsteady parameters and nanoparticle volume *** ranges of suction where dual non-similar solution exists,become larger when values of unsteady parameter as well as nanoparticle volume fraction ***,due to unsteadiness of flow dynamics and the presence of nanoparticles in flow field,the requirement of mass suction for existence of solution of boundary layer flow past an exponentially shrinking sheet is ***,the velocity boundary layer thickness decreases and thermal boundary layer thickness increases with increasing of nanoparticle volume fraction in both non-similar ***,for stronger mass suction,the velocity boundary layer thickness becomes thinner for the first solution and the effect is opposite in the case of second *** temperature inside the boundary layer increases with nanoparticle volume fraction and decreases with mass ***,for the unsteadiness and for the presence of nanoparticles,the flow separation is delayed to some extent.

关键词： unsteady boundary layer heat transfer nanofluid exponentially shrinking sheet dual non-similar solutions

Characterization of Almostη-Ricci–Yamabe Soliton and Gradient Almostη-Ricci–Yamabe Soliton on Almost Kenmotsu Manifolds

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Acta Mathematica Sinica,English Series 2023年第4期39卷 728-748页

作者： Somnath MONDAL Santu DEY Arindam bhattacharyya Department of Mathematics Jadavpur UniversityKolkata-700032India Department of Mathematics Bidhan Chandra College Asansol-4West Bengal-713304India

The prime object in this article is to study an almostη-Ricci-Yamabe soliton and gradient almostη-Ricci-Yamabe soliton within the framework of almost Kenmotsu *** is shown that normal almost Kenmotsu manifold admitting an almostη-Ricci-Yamabe soliton or gradientη-Ricci-Yamabe soliton is locally isometric to hyperbolic space H^(2n+1)(-1).Next,we prove that if a(κ,μ)almost Kenmotsu manifold admits an almostη-Ricci-Yamabe soliton,then the manifold isη-***,we find the condition for non-normal almost Kenmotsu manifolds acknowledging gradient almostη-Ricci-Yamabe ***,an almostη-Ricci-Yamabe soliton on(κ,μ)’-almost Kenmotsu manifold has been ***,we construct an example of a gradient almostη-Ricci-Yamabe soliton on a 3-dimensional Kenmotsu manifold.

关键词： Ricci soliton (k μ)-almost Kenmotsu manifold (r μ)-almost Kenmotsu manifold n-Ricci-Yamabe soliton

Investigation on surface structuring generated by electrochemical micromachining

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Advances in Manufacturing 2017年第3期5卷 217-230页

作者： Sandip Kunar B. bhattacharyya Department of Production Engineering Jadavpur UniversityKolkata 700032 India

Surface geometrical features and their function- ality depend on the manufacturing process which is employed for fabrication of surface structures. Maskless electrochemical micromachining （EMM） is used to generate various surface structures for diminishing and controlling friction and wear to increase the lifetime, reliability, and efficiency of mechanical systems. This paper presents a method for the generation of structured surfaces on stainless steel （SS-304） surfaces by using maskless EMM. The micropatterned tool is composed of 800 μm diameter circular holes in a 5 × 5 matrix form. The indigenously developed EMM set up consists of an EMM cell, electrical power supply system, and a controlled vertical cross-flow electrolyte circulation arrangement to control the influence of process parameters during the generation of the micro features of structured surfaces. The single structured cathode tool is used for the mass production of structured surfaces with a short fabrication time in the industrial context by avoiding the use of an individual masking process for each workpiece. The process has been characterized in terms of the effects of predominant process parameters such as machining voltage, electrolyte concentration, duty ratio, pulsed frequency, and machining time on the machined surface characteristics such as current efficiency, machining accuracy, and depth of the circular pattern on the stainless steel surfaces. A mathematical model is also developed to determine the theoretical depth of the dimple pattern and correlate the theoretical depths with actual depths as obtained by experimentation. Moreover, an effort has been made to study the structuringcharacteristics on the basis of micrographs obtained duringthe EMM.

关键词： Electrochemical micromachining (EMM)Surface structuring Circular pattern Machiningparameters - Current efficiency Machining accuracy ·Machining depth