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Stability of fluid flow in a brinkman porous medium–A numerical study

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Journal of Hydrodynamics 2014年第5期26卷 681-688页

作者： shankar b.m. KUmAR Jai SHIVAKUmARA I.S. 吴朝安 Department of mathematics PES Institute of TechnologyBangalore 560 085India ISRO Satellite Centre Bangalore 560 017India Department of mathematics Bangalore UniversityBangalore 560 001India Department of mechanical Engineering The University of Hong Kong

The stability of fluid flow in a horizontal layer of brinkman porous medium with fluid viscosity different from effective viscosity is investigated. A modified Orr-Sommerfeld equation is derived and solved numerically using the Chebyshev collocation method. The critical Reynolds number Re, the critical wave number ac and the critical wave speed cc are computed for various values of porous parameter and ratio of viscosities. based on these parameters, the stability characteristics of the system are discussed in detail. Streamlines are presented for selected values of parameters at their critical state.

关键词： brinkman model Chebyshev collocation method hydrodynamic stability modified Orr-Sommerfeld equation

biodiversity of endophytic fungi from seven herbaceous medicinal plants of malnad region, Western Ghats, southern India

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Journal of Forestry Research 2014年第3期25卷 707-711页

作者： b.shankar Naik m.Krishnappa Y.L.Krishnamurthy Department of P.G. Studies and Research in Applied botany Kuvempu University Govt. Science College Department of BiologyBadami

A total of 3611 fungal isolates were recovered from 4200 leaf segments incubated from 7 medicinal herbs during monsoon, winter and summer seasons. These fungal isolates belonged to teleomorphic Asco-mycota （23.5%）, anamorphic Ascomycota producing conidiomata （17.4%）, anamorphic Ascomycota without conidiomata （46.9%）, Zygo-mycota （1.42%） and sterile forms （10.6%）. Chaetomium globosum, As-pergillus niger, Aureobasidium pullulans, Curvularia lunata, Fusarium spp., Penicillium spp., Pestalotiopsis spp., Trichoderma viridae, Cladosporium cladosporioides, were frequently isolated from more than one host plant. The number of endophytic isolates was higher in winter than in monsoon and summer seasons.

关键词： endophytes diversity herbs seasonality malnad region

Optimal Data Placement and Replication Approach for SIoT with Edge

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Computer Systems Science & Engineering 2022年第5期41卷 661-676页

作者： b.Prabhu shankar S.Chitra Department of Information Technology Er Perumal Manimekalai College of EngineeringHosur635117TamilnaduIndia Department of Computer Science and Engineering Er Perumal Manimekalai College of EngineeringHosur63117TamilnaduIndia

Social networks(SNs)are sources with extreme number of users around the world who are all sharing data like images,audio,and video to their friends using IoT *** concept is the so-called Social Internet of Things(SIot).The evolving nature of edge-cloud computing has enabled storage of a large volume of data from various sources,and this task demands an efficient storage *** this kind of large volume of data storage,the usage of data replication using edge with geo-distributed cloud service area is suited to fulfill the user’s expectations with low *** major issue is the way to store the data and replicate these large data items optimally and allocate the request from the data center *** efficient storage of these data,we use edge server,which is part of the cloud server,in this ***,the data are distributed and stored with quick access,which will reduce the latency with *** proposed data placement approach learns with machine learning(mL)algorithm called radial basis kernel function assisted with support vector machine(RbF-SVm)to classify the data center for storing the user and friend’s data from the SIoT *** learning algorithms will be used to predict the workload of the data stored in the data center as either edge or cloud depending on the existing time *** data placement with dynamic nature is also optimized using the proposed dynamic graph partitioning(GP)method to meet the individual user’s demand of low latency with minimum *** way will keep the SIoT data placement efficient and effective over ***,this proposed data placement and replication approach introduces three kinds of innovations compared with the existing data placement approach.(i)Rather than storing the user data in a single cloud,this study uses the edge server closest to the SIoT devices for faster access with reduced response time.(ii)The classification algorithm called RbF-SVm is used to find storage for

关键词： Data placement data replication social network social internet of things edge computing cloud computing graph partitioning support vector machine machine learning radial basis function latency storage cost

Finite Difference Approach on magnetohydrodynamic Stratified Fluid Flow Past Vertically Accelerated Plate in Porous media with Viscous Dissipation

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Frontiers in Heat and mass Transfer 2024年第3期22卷 939-953页

作者： m.Sridevi b.shankar Goud Ali Hassan D.mahendar Department of mathematics Koneru Lakshmaiah Education Foundation HyderabadTelangana500043India Department of mathematics JNTUH University College of EngineeringScience&TechnologyHyderabad(TS)500085India Department of mathematics University of GujratGujrat50700Pakistan Department of mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhenChina b V Raju Institute of Technology NarsapurMedakIndia

This study intends to evaluate the influence of temperature stratification on an unsteady fluid flow past an accelerated vertical plate in the existence of viscous *** is assumed that the medium under study is a grey,non-scattered fluid that both fascinates and transmits *** leading equations are discretized using the finite differencemethod(FDm).UsingmATLAbsoftware,the impacts of flowfactors on flowfields are revealed with particular examples in graphs and a *** this regard,FDm results show that the velocity and temperature gradients increase with an increase of Eckert ***,tables of the data indicate the influence of flow-contributing factors on the skin friction coefficients,and Nusselt *** comparing constant and variable flow regimes,the constant flow regime has greater values for the nondimensional skin friction *** research is both innovative and fascinating since it has the potential to expand our understanding of fluid dynamics and to improve many different sectors.

关键词： mHD FDm stratified fluid porous media unsteady flow

mitochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflammaging-associated neurodegeneration

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Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierdo Centro de biología molecular Severo Ochoa(Cbm) Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting

A stability-indicating LC–mS/mS method for zidovudine: Identification,characterization and toxicity prediction of two major acid degradation products

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Journal of Pharmaceutical Analysis 2017年第4期7卷 231-236页

作者： Prashant S.Devrukhakar m.Shiva shankar G.shankar R.Srinivas School of Advance Sciences Vellore Institute of technology (VIT) National Centre for mass Spectrometry CSIR-Indian Institute of Chemical Technology

Zidvovudine(AZT) is a nucleoside analogue reverse transcriptase inhibitor(NRTI), a class of anti-retroviral drug. A stability-indicating assay method for AZT was developed in line with ICH guideline. Successful separation of AZT and its degradation products was achieved by gradient elution mode on reverse phase C_(18) column using 10 mm ammonium acetate: acetonitrile as the mobile phase at 0.8 mL/min flow rate, 25 μL injection volume, 30 °C column temperature and 285 nm detection wavelength. Two major acid degradation products were identified and characterized by liquid chromatography–electrospray ionization mass spectrometry(LC–ESI/mS/mS) and accurate mass measurements. The probable mechanisms for the formation of degradation products were identified based on a comparison of the fragmentation pattern of the [m + H]^+ions of AZT and its degradation products. One of the degradation products, DP-1, was isolated by semi-preparative high performance liquid chromatography(HPLC) using Waters Xbridge Prep C_(18)(250 mm×10 mm, 5 μm).Degradation products showed higher toxicity compared to the drug in some models assessed by TOPKAT software. The method validation was performed with respect to robustness, specificity, linearity, precision and accuracy as per ICH guideline Q2(R1).

关键词： Zidvovudine Stability study Degradation products In-silico toxicity prediction LC–ESI/mS/mS Degradation pathway

Ensemble based Learning with Accurate motion Contrast Detection

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Intelligent Automation & Soft Computing 2023年第2期35卷 1657-1674页

作者： m.Indirani S.shankar Hindusthan College of Engineering and Technology Coimbatore641032India

Recent developments in computer vision applications have enabled detection of signiﬁcant visual objects in video *** quoted in literature have detected objects from video streams using Spatiotemporal Particle Swarm Optimization(SPSOm)and Incremental Deep Convolution Neural Networks(IDCNN)for detecting multiple ***,the study considered opticalﬂows resulting in assessing motion *** methods have issue with accuracy and error rates in motion contrast ***,the overall object detection performance is reduced signiﬁ***,consideration of object motions in videos efﬁciently is a critical issue to be *** overcome the above mentioned problems,this research work proposes a method involving ensemble approaches to and detect objects efﬁciently from video *** work uses a system modeled on swarm optimization and ensemble learning called Spatiotemporal Glowworm Swarm Optimization model(SGSOm)for detecting multiple signiﬁcant objects.A steady quality in motion contrasts is maintained in this work by using Chebyshev distance *** proposed system achieves global optimization in its multiple object detection by exploiting spatial/temporal cues and local *** experimental results show that the proposed system scores 4.8%in mean Absolute Error(mAE)while achieving 86%in accuracy,81.5%in precision,85%in recall and 81.6%in F-measure and thus proving its utility in detecting multiple objects.

关键词： multiple signiﬁcant objects ensemble based learning modiﬁed pooling layer based convolutional neural network spatiotemporal glowworm swarm optimization model

Phytosociology of stratification in a lowland tropical rainforest occurring north of the Tropic of Cancer in meghalaya, India

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Plant Diversity 2019年第5期41卷 285-299页

作者： Uma shankar Department of botany North-Eastern Hill University

Stratification in lowland rainforests of meghalaya,India,which represent the westernmost limit of the rainforests north of the Tropic of Cancer,was studied in horizontal and vertical planes to elucidate the patterns in stacking of species diversity and community attributes,and to draw comparisons with rainforests of‘Indo-malaya’ecozone(biogeographical realm).All individuals≥10 cm GbH(girth at breast height)were enumerated in six transects of 10 m width and up to 500 m length covering 2.45 ha *** stratification of whole assemblage of species in vertical plane is referred to as‘storey structure’(=height class distribution),which explains structural *** horizontal plane,it is typically referred to as‘stand structure’(=girth class distribution),which explains structural *** stratification of an individual species in vertical plane is referred to as‘loftiness’and in horizontal plane,it is frequently referred to as‘population structure’.The stand structure was characterized by a negative exponential relationship or a reverse J-shaped curve,which is typical of a well regenerating forest *** storey structure was characterized by the low stature of the rainforest(m),subtle layering in the canopy with dearth of discrete multi-stories,narrower widths of the stories and a thick *** cluster analysis and‘candlestick charts’showed that the dominant species spatially segregated in canopy height to profile three strata,viz.,an understory of juveniles and shrubs below 5 m,a middle-storey of intermediate trees between 5 and 15 m,and an overstory of large trees between 15 and 25 *** trees of a few species may reach up to 30 *** individuals tended to scatter in increasingly wider range of height classes from a lower to the next higher girth class,creating a‘torchlight scatter’pattern,with a tendency to concentrate towards smaller height classes due to stochastic factors,which potentially influence vertical growth proportionate t

关键词： Forest stratification Stand structure Storey structure Loftiness Population structure Northeast India

mathematical Study of HD micropolar Fluid Flow with Radiation and Dissipative Impacts over a Permeable Stretching Sheet:Slip Effects Phenomena

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Frontiers in Heat and mass Transfer 2023年第1期21卷 539-562页

作者： Pudhari Srilatha Ahmed m.Hassan b.shankar Goud E.Ranjit Kumar Department of mathematics Institute of Aeronautical EngineeringHyderabadIndia Faculty of Engineering Future University in EgyptNewCairoEgypt Department of mathematics JNTUH University College of EngineeringScience&TechnologyHyderabadIndia Department of mathematics Kakatiya Institute of Technology and ScienceTelanganaIndia

The purpose of this research is to investigate the influence that slip boundary conditions have on the rate of heat and mass transfer by examining the behavior of micropolar mHD flow across a porous stretching *** addition to this,the impacts of thermal radiation and viscous dissipation are taken into *** the use of various computing strategies,numerical results have been *** transformation was utilized in order to convert the partial differential equations(PDEs)that regulated energy,rotational momentum,concentration,and momentum into ordinary differential equations(ODEs).As compared to earlier published research,mATLAb inbuilt solver solution shows an extremely good correlation in exceptional *** exceptional instances,the present mATLAb inbuilt solver solution has a very excellent connection with the findings of the previously published investigations.A variety of flow field factors impact the Nusselt number,the wall couple shear stress,the friction factor,Sherwood numbers the dimensionless distributions discussed in *** the Eckert number rises,the temperature rises,and the Schmidt number falls,the concentration *** increases with increases in the material factor but drops with increases in the magnetic parameter and the surface condition factor.

关键词： micropolar radiation bvp4c mHD suction/injection