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

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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A Comparative Study on rat Intestinal Epithelial Cells and resident Gut Bacteria (ii) Effect of Arsenite

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Biomedical and Environmental Sciences 2006年第2期19卷 77-86页

作者： rAJ k.UPrETI A.kANNAN rICHA SHrIVASTAVA U.C.chaturvedi Biomembrane Toxicology Laboratory Industrial Toxicology Research Centre M. G. Marg P. B. No. 80 Lucknow-226001 India

Objective In order to use facultative gut bacteria as an alternate to animals for the initial gastrointestinal toxicity screening of heavy metals, a comparative study on rat intestinal epithelial cells and resident gut bacteria was undertaken. Methods in vitro growth rate of four gut bacteria, dehydrogenase （DHA） and esterase （EA） activity test, intestinal epithelial and bacterial cell membrane enzymes and in situ effect of arsenite were analysed. results Growth profile of mixed resident population of gut bacteria and pure isolates of Escherichia coli, Pseudomonas sp., Lactobacillus sp., and Staphylococcus sp. revealed an arsenite （2-20 ppm） concentration-dependent inhibition. The viability pattern of epithelial cells also showed similar changes. DHA and EA tests revealed significant inhibition （40%-72%） with arsenite exposure of 5 and 10 ppm in isolated gut bacteria and epithelial cells. Decrease in membrane alkaline phosphatase and Ca^2＋-Mg^2＋-ATPase activities was in the range of 33%-55% in four bacteria at the arsenite exposure of 10 ppm, whereas it was 60%-65% in intestinal epithelial villus cells, in situ incubation of arsenite using intestinal loops also showed more or less similar changes in membrane enzymes of resident gut bacterial population and epithelial cells. Conclusion The results indicate that facultative gut bacteria can be used as suitable in vitro model for the preliminary screening of arsenical gastrointestinal cytotoxic effects.

关键词： Arsenic Gut microflora Intestinal bacteria Intestinal epithelial cells Membrane enzymes GI-toxicity

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Study of synthetic aperture radar and automatic identification system for ship target detection

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Journal of Ocean Engineering and Science 2019年第2期4卷 173-182页

作者： Sudhir kumar chaturvedi Department of Aerospace Engineering University of Petroleum&Energy StudiesDehradun 248007India

In the past,the main goals of Synthetic Aperture radar(SAr)systems were the study of the interaction of electromagnetic waves with the earth ***,the development of multi-channel SAr systems has enabled the development of more sophisticated techniques for the surveillance *** is the most efficient instrument,which provides high-resolution data for wide ocean area surveillance under all weather *** intrinsic capability of this instrument is to provide a quick view of the oceanic surface features such as vessels,waves and currents,oil spills,laver facilities and wind *** ship detection or recognition is achieved in two steps:the first step is to identify the target in SAr images of a busy traffic,which corresponds to Automatic Identification System(AIS)signals by the“dead-reckoning(Dr)position”,and the second step is to estimate the position,size and speed of the ship from SAr images and compare these results with the AIS“true”*** paper presents the fundamentals of SAr and its integration with the AIS data for the ship target detection.

关键词： SAr AIS Dead reckoning Target detection.

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In vivo subsite classification and diagnosis of oral cancers using raman spectroscopy

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Journal of Innovative Optical Health Sciences 2016年第5期9卷 57-70页

作者： Aditi Sahu Atul Deshmukh Arti r.Hole Pankaj chaturvedi CMurali krishna Chilakapati Laboratory ACTRECTMC KhargharNavi Mumbai 410210India Head and Neck Surgical Oncology Tata Memorial HospitalDr.E.Borges RoadParelMumbaiMaharashtra-400012India

Oral cancers suffer from poor disease free survival rates due to delayed ***,rapid,objective approaches as adjuncts to visual inspection can help in better management of oral *** spectrosoopy(rS)has shown potential in identification of oral premalignant and malignant conditions and also in the detection of early cancer changes like cancer field ffects(CFE)at buccal mucosa *** differences between different oral subsites have also been reported using *** this study,anatomical differences between subsites and their possible infuence on healthy vs pathological classification were evaluated on 85 oral cancer and 72 healthy *** were acquired from buccal mucosa,lip and tongue in healthy,contralateral(internal healthy control),premalignant and cancer conditions using fiber optic raman *** spectra indicate predominance of lipids in healthy buccal mucosa,contribution of both lipids and proteins in lip while major dominance of protein in tongue *** healthy to tumor,changes in protein secondary structure,DNA and heme related features were *** component linear discriminant analysis(PC-LDA)followed by leave one out CrOoss-validation(LOOCV)was used for data *** gs indicate buccal mucosa and tongue are distinct entities,while lip misclassifies with both these ***,the diagnostic algorithm for individual subsites gave improved classification efficiencies with respect to the pooled subsites ***,as the pooled subsites model yielded 98%specifcity and 100%sensitivity,this model may be more useful for preliminary screening ***-scale validation studies are a pre requisite before envisaging future clinical applications.

关键词： Oral cancer screening in vivo raman spectroscopy PC-LDA.

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Modeling and Simulation of Systems Using MATLAB and Simulink

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1000年

作者： Devendra k. chaturvedi

来源：畅想之星图书光盘版（南... 评论

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relative effects of different leaf attributes on sapling growth in tropical dry forest

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Journal of Plant Ecology 2014年第6期7卷 544-558页

作者： ravi k.chaturvedi A.S.raghubanshi J.S.Singh Institute of Environment and Sustainable Development Banaras Hindu UniversityVaranasi 221005India Ecosystems Analysis laboratory Department of BotanyBanaras Hindu UniversityVaranasi 221005India

Aims Soil moisture content(SMC)influences establishment,survival and development of plant species and is considered as the most important limiting factor in tropical dry forest(TDF).In this study we attempt to establish the relationship between leaf attributes and of tree saplings in TDF and address the following questions:(i)how are the functional attributes of dominant tree saplings of TDF affected by seasonal changes in SMC at different habitats?,(ii)what is the relationship of functional attributes with each other?,(iii)how are the functional attributes and their plasticity affected by habitat con-ditions?and(iv)can the functional attributes in single or in com-bination predict the growth rate of tree saplings of TDF?The study was conducted on four sites(Hathinala,Gaighat,Harnakachar and ranitali,listed in order of decreasing SMC)within the tropical dry deciduous forest in northern *** We analysed eight leaf attributes,specific leaf area(SLA);leaf dry matter content(LDMC);leaf nitrogen concentration(leaf N);leaf phosphorus concentration(leaf P);chlorophyll concentration(Chl);mass-based photosynthetic rate(Amass);mass-based stomatal con-ductance(Gsmass);intrinsic water use efficiency(WUEi)and three growth attributes,relative diameter increment(rDI);relative height increment(rHI);relative growth rate(rGr)of the 10 dominant tree saplings(viz.,Acacia catechu,Anogeissus latifolia,Boswellia serrata,Buchanania lanzan,Diospyros melanoxylon,Hardwickia binata,Lagerstroemia parviflora,Lannea coromandelica,Shorea robusta and Terminalia tomentosa)of a TDF and observed the effects of site,season and species for a period of 2 *** were selected in gradients of ***-wise multiple regression was performed to predict rDI,rHI and rGr from mean values of SMC and leaf *** Findings All the 11 attributes were interrelated and differed significantly among the 10 *** response varied across sites and *** the SMC g

关键词： tropical dry forest soil moisture content deciduousness tree saplings leaf attributes relative growth rate

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Comparative analysis of spray-drying microencapsulation of Lacticaseibacillus casei in synbiotic legume-based beverages

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Food Bioscience 2022年第6期50卷 1605-1614页

作者： Smriti chaturvedi Snehasis Chakraborty Department of Food Engineering and Technology Institute of Chemical TechnologyMumbai400019India

This study investigated the effect of three carrier agents, viz. maltodextrin (MD), gum acacia (GA), and xanthan gum (XG), on three synbiotic legume-based beverages subjected to optimized spray-drying conditions. Several characteristics of the encapsulated synbiotic powders were evaluated, including moisture content, bulk, and tapped density, dissolution encapsulation efficiency, flow properties, particle density, porosity, color, and powder yield. The survivability of probiotic bacteria Lacticaseibacillus casei ATCC 335 was also observed under gastric acid, bile salts, and simulated gastrointestinal tract. The results showed that while the higher powder yield (11–23%) was shown by MD-coated beverage powders, GA-coated beverage powders showed better encapsulation efficiency (79.9–89.3%) as well as lower moisture content values (reover, among all the samples, GA-coated kidney bean beverage (kB) powder showed the maximum probiotic survivability (>7 log CFU/mL) in the case of gastrointestinal simulation and under gastric acid and bile juice. The scanning electron microscopy also showed the desirable particle morphology and formation of microcapsules preserving the probiotic activity. The thermal properties of GA-coated kB powder showed the peak degradation temperature as 143.44 °C, which suggested the use of appropriate drying temperatures for making stable encapsulated synbiotic powders. Thus, GA-coated kB powder holds the potential to be used as a functional food with synbiotic properties along with acceptable powder characteristics and maximum probiotic survivability.

关键词： Carrier agents In-vitro gastrointestinal digestion Probiotic Non-dairy Prebiotics

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Emerging potential of progranulin-dependent SorCS2 signaling in healthy and diseased nervous systems

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Neural regeneration research 2025年第9期20卷 2591-2593页

作者： Alena Salasova Anders Nykjær Danish research Institute of Translational Neuroscience DANDrITE-Nordic EMBL Partnership for Molecular Medicine and Centre of Excellence PROMEMODepartment of BiomedicineAarhus UniversityAarhusDenmark

The formation of the mammalian nervous system and its maturation into sensory,motor,cognitive,and behavioral circuits is a complex process that begins during early embryogenesis and lasts until young *** neurodevelopm... 详细信息

关键词： progr jointly CS2

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Mathematical modelling and analysis of plastic waste pollution and its impact on the ocean surface

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Journal of Ocean Engineering and Science 2020年第2期5卷 136-163页

作者： Sonam chaturvedi Bikarama Prasad Yadav Nihal Anwar Siddiqui Sudhir kumar chaturvedi Department of Health Safety Environment and Civil Engineering University of Petroleum and Energy Studies(UPES)Bidholi Energy AcresDehradun 248007India Department of Aerospace Engineering University of Petroleum and Energy Studies(UPES)Bidholi Energy AcresDehradun 248007India

Plastic contamination is universal all through the marine condition,yet gauges of the worldwide plenitude and weight of coasting plastics have needed information,especially from the Southern Hemisphere and remote *** we report a gauge of the all-out number of plastic particles and their weight gliding on the planet’s seas from 24 endeavours(2007-2013)over every one of the five subtropical gyres,coastal Australia,Bay of Bengal and the Mediterranean Sea directing surface net tows(N=680)and visual review transects of huge plastic flotsam and debris(N=891).Utilizing an oceanographic model of coasting trash dispersal adjusted by our information,and rectifying for wind-driven vertical blending,we gauge at least 5.25 trillion particles weighing 268,940 *** looking at between four size classes,two micro plasticro plastic>4.75 mm,a huge loss of micro plastics is seen from the ocean surface contrasted with anticipated paces of discontinuity,recommending there are systems at play that expelrticles from the sea *** focus on the life cycle assessment and the brief overview of the plastic waste management over the ocean surfaces with the various mathematical models has been *** impact of the ocean pollution is also being analysed.

关键词： Solid waste Plastic Garbage patch Ocean pollution Mathematical model Ocean surface

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Curcumin-primed and curcuminloaded exosomes：potential neural therapy

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Neural regeneration research 2017年第2期12卷 205-206页

作者： Anuradha kalani Pankaj chaturvedi Department of Medicine University of Louisville Louisville KYUSA Department of Physiology University of Louisville Louisville KYUSA

Curcumin：Curcumin is a yellow colored compound found in the rhizomes of Curcuma longa（turmeric）,a member of the ginger family（Zingiberaceae）.Structurally curcumin is a diarylheptanoid,a tautomeric compound,presen... 详细信息

关键词： Hcy Curcumin-primed and curcuminloaded exosomes

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