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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

Ligand-free monophasic CuPd alloys endow boosted reaction kinetics toward energy-efficient hydrogen fuel production paired with hydrazine oxidation

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Journal of Materials Science & Technology 2023年第12期143卷 20-29页

作者： Yujeong Jeong Shreyanka shankar naik Yiseul Yu Jayaraman Theerthagiri Seung Jun Lee Pau Loke Show Hyun Chul Choi Myong Yong Choi Department of Chemistry(bK21 FOUR) Research Institute of Natural SciencesGyeongsang National UniversityJinju 52828Republic of Korea Core-Facility Center for Photochemistry&Nanomaterials Gyeongsang National UniversityJinju 52828Republic of Korea Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine biological Resources Protection Wenzhou UniversityWenzhou 325035China Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham MalaysiaJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia Department of Chemistry Chonnam National UniversityGwangju 61186Republic of Korea

Optimizing the structure and components is a prevalent strategy for increasing electrocatalytic energy-saving H 2 fuel *** of the sustainable and efficient techniques is electrocatalytic water split-ting for H 2 generation,but it is still restricted by the kinetically sluggish *** to the lower standard oxidation potential of−0.33 V,replacing the OER with anodic hydrazine oxidation reaction(HzOR)is an effective way to extensively reduce the use of electricity in water *** alloying,the semiconductor and adsorption characteristics of Cu,interlaced by Pd 2+solution on the Pd surface by pulsed laser ablation(PLA)in methanol,are selectively altered to maximize cathodic HER and anodic HzOR *** optimal Cu1Pd3/C ratio demonstrates outstanding HER performance with a low overpotential of 0.315 V at 10 mA cm^(−2),as well as an ultralow overpotential of 0.560 V for HzOR in 0.5 M N_(2) H_(4)/1.0 M ***,the constructed HzOR-assisted electrolyzer cell with Cu1Pd3/C||Cu1Pd3/C as anode and cathode exhibits a cell voltage of 0.505 V at 10 mA cm^(−2) with exceptional en-durance over 5 *** current study advances competent CuPd alloys as multifunctional electrocatalysts for H 2 fuel production using a HzOR-assisted energy-efficient electrolyzer.

关键词： PLA CuPd alloy Sonochemical process HzOR Hydrazine evolution reaction Hydrazine splitting Water splitting

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

Recent advances in mobile edge computing and content caching

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Digital Communications and Networks 2020年第2期6卷 189-194页

作者： Sunitha Safavat Naveen naik Sapavath Danda b.Rawat Data Science and Cybersecurity Center(DSC2) Department of Electrical Engineering and Computer ScienceHoward UniversityWashingtonDC20059USA

The demand for digital media services is increasing as the number of wireless subscriptions is growing *** order to meet this growing need,mobile wireless networks have been advanced at a tremendous pace over recent ***,the centralized architecture of existing mobile networks,with limited capacity and range of bandwidth of the radio access network and low bandwidth back-haul network,can not handle the exponentially increasing mobile ***,we have seen the growth of new mechanisms of data caching and delivery methods through intermediate caching *** this paper,we present a survey on recent advances in mobile edge computing and content caching,including caching insertion and expulsion policies,the behavior of the caching system,and caching optimization based on wireless *** of the important open challenges in mobile edge computing with content caching are identified and *** have also compared edge,fog and cloud computing in terms of *** of this paper will get a thorough understanding of recent advances in mobile edge computing and content caching in mobile wireless networks.

关键词： Mobile edge computing Content caching MEC

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

Weakly nonlinear stability analysis of triple diffusive convection in a Maxwell fluid saturated porous layer

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Applied Mathematics and Mechanics(English Edition) 2018年第2期39卷 153-168页

作者： K.R.RAGHUNATHA I.S.SHIVAKUMARA b.M.shankar Department of Mathematics Bangalore University Department of Mathematics PES University

The weakly nonlinear stability of the triple diffusive convection in a Maxwell fluid saturated porous layer is investigated. In some cases, disconnected oscillatory neutral curves ave found to exist, indicating that three critical thermal Darcy-Rayleigh numbers are required to specify the linear instability criteria. However, another distinguishing feature predicted from that of Newtonian fluids is the impossibility of quasi-periodic bifurcation from the rest state. besides, the co-dimensional two bifurcation points are located in the Darcy-Prandtl number and the stress relaxation parameter plane. It is observed that the value of the stress relaxation parameter defining the crossover between stationary and oscillatory bifurcations decreases when the Darcy-Prandtl number increases. A cubic Landau equation is derived based on the weakly nonlinear stability analysis. It is found that the bifurcating oscillatory solution is either supercritical or subcritical, depending on the choice of the physical parameters. Heat and mass transfers are estimated in terms of time and area-averaged Nusselt numbers.

关键词： Maxwell fluid triple diffusive convection nonlinea~ stability bifurcation,heat and mass transfer

Modeling the mechanics of calcium regulation in T lymphocyte:A finite element method approach

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International Journal of biomathematics 2020年第5期13卷 149-169页

作者： Parvaiz Ahmad naik School of Mathematics and Statistics Xi'an Jiaotong Unirersity Xi'an Shaanxi 710049P.R.China

Changes in cellular Ca2+concentration control a variety of physiological activities including hormone and neurotransmitter release,muscular contraction,synaptic plas-ticity,ionic channel permeability,apoptosis,enzyme activity,gene transcription and reproduction ***-temporal Ca2+dynamics due to Ca2 t release,buffering and re-uptaking plays a central role in studying the Ca2+regulation in T *** most cases,Ca2+has its major signaling function when it is elevated in the cytosolic *** this paper,a two-dimensional mathematical model to study spatiotemporal variations of intracellular Ca2+concentration in T lymphocyte cell is proposed and *** cell is assumed to be a circular shaped geomnetrical domain for the representation of properties of Ca2+dynamics within the cell includ-ing important ***2+binding proteins for the dynamics of Ca2+are itself buffer and other physiological parameters located in Ca2+*** model incorpo-rates the important biophysical processes like difusion,reaction,voltage gated Ca2+channel,leak from endoplasmic reticulum(ER),efflux from cytosol to ER via sarco ER Ca2+adenosine triphosphate(SERCA)pumps,buffers and Na+/Ca2+*** proposed mathematical model is solved using a finite difference method and the finite element *** initial and boundary conditions are incorporated in the model based on biophysical conditions of the *** simulations in MAT-LAb R2019b are employed to investigate mathematical models of reaction-diffusion *** effect of source,buffer,Nat/Ca2+exchanger,*** spatial and tempo-ral patterns of Ca2+in T lymphocyte has been studied with the help of numerical *** the obtained results,it is observed that,the coordinated combination of the incor-porated parameters plays a significant role in Ca2+regulation in T *** leak and voltage-gated Ca2+channel provides the necessary Ca2+to the cell when required for its proper

关键词： Nat/Ca2+exchanger SERCA purmp ER leak voltage gated Ca2+channel buffers diffusion coefficient reaction-diffusion equations Ritz method and variational form

A Novel Image Encryption Technique based on Inter block Difference

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Journal of Shanghai Jiaotong university(Science) 2021年第4期26卷 488-493页

作者： THAMANAM Srinivasa Rao Potti Nagaraja b.balaji naik K.Manjunathachari Department of EECE Gandhi Institute of Technology and ManagementHyderabadTelangana502329India

Data security plays a vital role in the current scenario due to the advanced and sophisticated data access techniques. Present development in data access is always a threat to data that are stored in electronic devices. Among all the forms of data, image is an important aspect that still needs methodologies to be stored securely. This work focuses on a novel technique to secure images using inter block difference and advanced encryption standard (AES). The AES algorithm is chosen for encryption since there is no prevalent attack that is successful in analyzing it. Instead of encrypting the entire image, only a part of the image is encrypted. The proposed work is found to reduce the encryption overhead in a significant way and at the same time preserves the safety of the image. It is also observed that the decryption is done in an efficient and time preserving manner.

关键词： encryption decryption inter block difference advanced encryption standard(AES)

Progeny evaluation of Jatropha curcas and Pongamia pinnata with comparison to bioproductivity and biodiesel parameters

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Journal of Forestry Research 2015年第1期26卷 137-142页

作者： Vinod Kumar Patil Prithviraj bhandare Pramod b. Kulkarni G.R.naik Department of biotechnology Gulbarga University

Progeny studies of Jatropha curcas and Pongamia pinnata were carried with respect to bioproductivity,pod and seed characters which is one of the selection methods in tree improvement programmes. Variations in bioproductivity and biodiesel parameters of both the plants were compared every 6 months for 4 years of investigation and analyzed by analysis of variance and correlation coefficient by Pearson＇s method using software Graphpad instat 3.06（for Windows and Mac）. P. pinnata has better germination rate（71.4 %）, 100 pod weight（PW）（311.59 g） and 100 seed weight（SW）（173.46 g） as compared to J. curcas for germination rate（43.2 %）, 100 PW（111.29 g） and 100 SW（67.46 g）. P. pinnata has strong correlation for plant height to canopy growth（CG）（0.948）, collar diameter（CD）（0.994）, number of branches per plant（NbP）（0.995） and to number of leaves per branch（NLb）（0.862） as compared to *** which showed good correlation among plant height to CG（0.976）, CD（0.970）, NbP（0.988）, NLb（0.920） and to number of pods per branch（0.657）. However, J. curcas depicted negative correlation for pod breadth to seed length（SL）（-0.447）, seed breadth（-0.248） and to seed thickness（ST）（-0.364） and among the 100 PW to SL（-0.199）, ST（-0.220） and to 100 SW（-0.704）. About 4 kg of P. pinnata seeds were required for each liter of crude oil which yields896 ml of biodiesel on transesterification as compared to5.66 kg of J. curcas seeds for a liter of crude oil, producing about 663 ml of biodiesel. The quality of biodiesel meets the major specification of American Society for Testing and Materials（ASTM） standards for biodiesel. The crude glycerin and seed cake obtained as byproduct during biodiesel production were also measured which can be purified and used in composting, animal feeds, pharmaceuticals and cosmetic industries.

关键词： biodiesel biofuel plants bioproductivity Jatropha curcas Pongamia pinnata

Stiffness of a 3-degree of freedom translational parallel kinematic machine

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Frontiers of Mechanical Engineering 2014年第3期9卷 233-241页

作者： S. shankar GANESH A.b. KOTESWARA RAO Department of Mechanical Engineering Gayatri Vidya Parishad College of Engineering Visakhapatnam 530048 India

In this paper, a typical 3-degree of freedom （3- DOF） translational parallel kinematic machine （PKM） is studied and analyzed whose tool platform has only translations along X-, Y- and Z-axes. It consists of three limbs, each of which have arm and forearm with prismatic- revolute-revolute-revolute （PRRR）joints. Inverse kine- matics analysis is carried out to find the slider coordinates and joint angles for a given position of tool platform. Stiffness modeling is done based on the compliance matrices of arm and forearm of each limb. Using the stiffness modeling the variations of minimum and max- imum translational stiffness in the workspaee are analyzed. For various architectural parameters of the 3-DOF PKM the tendency of variations on the minimum and maximum stiffness over the entire workspace is studied; and also the deflections of the tool platform along X, Y, and Z directions with respect to various forces are presented.

关键词： 3-DOF translational PKM inverse kine-matics stiffness modeling translational stiffness