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Peristaltic transport of Herschel-Bulkley fluid in a non-uniform elastic tube

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Propulsion and Power Research 2019年第3期8卷 253-262页

作者： C.K.selvi A.N.s.srinivas Department of Mathematics School of Advanced SciencesVIT UniversityVellore632014TamilnaduIndia

The influence of elasticity on peristaltic transport of Herschel-Bulkley fluid in a tube of non-uniform cross-section is *** exact solutions for flow quantities such as velocity,stream function,pressure gradient,and volume flow rate are *** relationship between flux and pressure difference is *** effects of different pertinent parameters on variation of flux along the radius of the tube are analyzed through *** results show that the yield stress and fluid behavior index has significant effect on flux variation of Herschel-Bulkley fluid in a non-uniform elastic *** effect of elastic parameters on flux variation is *** phenomenon is presented graphically to understand the physical behavior of various *** the absence of non-uniform parameter the present results are similar to the observations of Vajravelu et al.[19].

关键词： Peristaltic flow Non-uniform tube Non-newtonian fluid Yield stress Volume flow rate Elasticity

Preparation of composite tubular grafts for vascular repair via electrospinning

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Progress in Natural science:Materials International 2012年第2期22卷 108-114页

作者： salem s.Al-Deyab Mohamed El-Newehy Petrochemical Research Chair Department of ChemistryCollege of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Chemistry Faculty of ScienceTanta UniversityTanta 31527Egypt

A novel type of composite vascular graft was developed via electrospinning in the present *** and chitosan were blended to form the inner and outer ***(l-lactide-co-caprolactone)(P(LLA-CL))was selected as a material for the middle layer of composite vascular *** morphology and diameter of the composite grafts were studied by scanning Electron Microscope(sEM).The results of mechanical tests showed that the composite scaffolds provided the whole grafts with better strength and flexibility compared with blended grafts,mainly due to the fact that the middle layer was P(LLA-CL).Cell viability studies with endothelial cells suggested a prompt adhesion and proliferation duo to the fact that the outer layer was collagen and *** microscopy demonstrated that a monolayer of endothelial cells could be formed after 7 days of *** above results indicated that the composite fibrous scaffolds could be a good candidate for blood vessel repair by electrospinning method.

关键词： Electrospinning Composite Vascular graft Endothelial cell Nanofiber

Feature selection with Deep Reinforcement Learning for Intrusion Detection system

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Computer systems science & Engineering 2023年第9期46卷 3339-3353页

作者： s.Priya K.Pradeep Mohan Kumar Department of Computer science and Engineering SRM Institute of Science and TechnologyRamapuramChennai600089India Department of Computing Technologies SRM Institute of Science and TechnologyKattankulathurChennai603203India

An intrusion detection system(IDs)becomes an important tool for ensuring security in the *** recent times,machine learning(ML)and deep learning(DL)models can be applied for the identification of intrusions over the network *** resolve the security issues,this paper presents a new Binary Butterfly Optimization algorithm based on Feature selection with DRL technique,called BBOFs-DRL for intrusion *** proposed BBOFsDRL model mainly accomplishes the recognition of intrusions in the *** attain this,the BBOFs-DRL model initially designs the BBOFs algorithm based on the traditional butterfly optimization algorithm(BOA)to elect feature ***,DRL model is employed for the proper identification and classification of intrusions that exist in the ***,beetle antenna search(BAs)technique is applied to tune the DRL parameters for enhanced intrusion detection *** ensuring the superior intrusion detection outcomes of the BBOFs-DRL model,a wide-ranging experimental analysis is performed against benchmark *** simulation results reported the supremacy of the BBOFs-DRL model over its recent state of art approaches.

关键词： Intrusion detection security reinforcement learning machine learning feature selection beetle antenna search

Recent advances in biomaterials for 3D scaffolds: A review

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Bioactive Materials 2019年第1期4卷 271-292页

作者： Maria P.Nikolova Murthy s.Chavali Department of Material science and Technology University of Ruse“A.Kanchev”8 Studentska Str.7000RuseBulgaria shree Velagapudi Ramakrishna Memorial College(PG studies Autonomous)Nagaram522268Guntur DistrictIndia PG Department of Chemistry Dharma Appa Rao CollegeNuzvid521201Krishna DistrictIndia MCETRC Tenali522201Guntur DistrictAndhra PradeshIndia

Considering the advantages and disadvantages of biomaterials used for the production of 3D scaffolds for tissue engineering,new strategies for designing advanced functional biomimetic structures have been *** offer a comprehensive summary of recent trends in development of single-(metal,ceramics and polymers),composite-type and cell-laden scaffolds that in addition to mechanical support,promote simultaneous tissue growth,and deliver different molecules(growth factors,cytokines,bioactive ions,genes,drugs,antibiotics,etc.)or cells with therapeutic or facilitating regeneration *** paper briefly focuses on divers 3D bioprinting constructs and the challenges they *** on their application in hard and soft tissue engineering,in vitro and in vivo effects triggered by the structural and biological functionalized biomaterials are *** authors discuss the future outlook for the development of bioactive scaffolds that could pave the way for their successful imposing in clinical therapy.

关键词： Bioactive scaffolds Bone tissue engineering Polymeric biomaterials Bioceramics Bioprinting

A Cyber-Attack Detection system Using Late Fusion Aggregation Enabled Cyber-Net

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Intelligent Automation & soft Computing 2023年第6期36卷 3101-3119页

作者： P.shanmuga Prabha s.Magesh Kumar Department of Computer science and Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences(Deemed to be University)ChennaiTamilnaduIndia

Today,securing devices connected to the internet is challenging as security threats are generated through various *** protection of cyber-physical systems from external attacks is a primary *** presented method is planned on the prime motive of detecting cybersecurity attacks and their impacted *** proposed architecture employs the LYsIs dataset and formulates Multi Variant Exploratory Data Analysis(MEDA)through Principle Component Analysis(PCA)and singular Value Decompo-sition(sVD)for the extraction of unique *** feature mappings are analyzed with Recurrent 2 Convolutional Neural Network(R2CNN)and Gradient Boost Regression(GBR)to identify the maximum *** Late Fusion Aggregation enabled with Cyber-Net(LFAEC)is the robust derived *** quantitative analysis uses predicted threat points with actual threat variables from which mean and difference vectors *** performance of the presented system is assessed against the parameters such as Accuracy,Precision,Recall,and F1 *** proposed method outperformed by 98% to 100% in all quality measures compared to existing methods.

关键词： External attacks cyber-physical systems principle component analysis singular value decomposition recurrent 2 convolutional neural network gradient boost regression

Leading directions and effective distance of larch offspring dispersal at the upper treeline in the Northern and Polar Urals, Russia

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Forest Ecosystems 2024年第5期11卷 603-617页

作者： P.A.Moiseev V.L.semerikov T.V.semerikova D.s.Balakin I.B.Vorobiev s.O.Viuykhin Institute of Plant and Animal Ecology Ural BranchRussian Academy of SciencesEkaterinburg620144Russia Center for Genetics and Life science Sirius University of Science and Technology354340SochiRussia

Climate has changed sufficiently over the last 150 years and forced out upper treeline advance at the most studied sites around the *** rate of advance has been extremely variable–from tens to hundreds meters in *** is because the degree at which tree frontal populations respond to climate change depends on the complex interaction of biological and physical *** resulting stand pattern is the consequence of the interaction between dispersal and survival functions.A few publications have addressed the question of how this pattern is *** order to understand how the spatial structure of tree stands was formed at the upper limit of their distribution in the Ural Mountains,we assessed the distance and direction of dispersal of offspring from maternal *** found that in frontal Larix sibirica ***,‘effective’dispersal of offspring ranges from 3 to 758 m(with a median of 20–33 m in open forest and 219 m in single-tree tundra in the Polar Urals and 107 m in open forest in the Northern Urals).We revealed that most of the offspring effectively dispersed not only in the direction of the prevailing winds,but also in the opposite direction up the slope,and the distance can reach 500–760 *** data obtained can be used to develop an individual-based model which is capable of simulating in detail the dynamics of tree stands at the upper limit of their growth and reliably predicting the future position and pattern of treeline ecotone as growth conditions continue to improve in the face of observed climate change.

关键词： Effective dispersal distance Upper treeline Parentage analysis Age estimation Terrestrial laser scanning Larix sibirica Ural mountains

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Fourier Collocation and Reduced Basis Methods for Fast Modeling of Compressible Flows

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Communications in Computational Physics 2022年第8期32卷 595-637页

作者： Jian Yu Deep Ray Jan s.Hesthaven school of Aeronautic science and Engineering Beihang UniversityBeijing 100191China Laboratory of Aero-thermal Protection Technology for Aerospace Vehicles China Aerospace Science and Technology CorporationBeijing 100048China school of Aerospace and Mechanical Engineering University of Southern CaliforniaLos AngelesCA 90089USA Chair of ComputationalMathematics and simulation schience Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland

A projection-based reduced order model(ROM)based on the Fourier collocation method is proposed for compressible *** incorporation of localized artificial viscosity model and filtering is pursued to enhance the robustness and accuracy of the ROM for shock-dominated ***,for Euler systems,ROMs built on the conservative and the skew-symmetric forms of the governing equation are *** ensure efficiency,the discrete empirical interpolation method(DEIM)is *** alternative reduction approach,exploring the sparsity of viscosity is also investigated for the viscous terms.A number of one-and two-dimensional benchmark cases are considered to test the performance of the proposed *** show that stable computations for shock-dominated cases can be achieved with ROMs built on both the conservative and the skew-symmetric forms without additional stabilization components other than the viscosity model and *** the same parameters,the skew-symmetric form shows better robustness and accuracy than its conservative counterpart,while the conservative form is superior in terms of efficiency.

关键词： Projection-based reduced order modeling Fourier collocation artificial viscosity compressible flow

The kinematical and space structures of IC 2391 open cluster and moving group with Gaia-DR2

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Research in Astronomy and Astrophysics 2020年第2期20卷 21-30页

作者： E.s.Postnikova W.H.Elsanhoury Devesh P.sariya N.V.Chupina s.V.Vereshchagin Ing-Guey Jiang Institute of Astronomy of Russian Academy of sciences(INAsAN) 48 Pyatnitskaya st.MoscowRussia Astronomy Department National Research Institute of Astronomy and Geophysics(NRIAG)11421HelwanCairoEgypt(Affiliation ID:60030681) Physics Department Faculty of Science and ArtsNorthern Border UniversityTuraif BranchSaudi Arabia Department of Physics and Institute of Astronomy “National Tsing Hua University”Hsinchu 30013

The kinematical parameters,spatial shape and structure of the open cluster IC 2391 and the associated stellar stream are studied here using Gaia Data Release 2(GDR2) astrometry *** apex positions are determined for the open cluster IC 2391(data taken from Cantat-Gaudin et al.) and for the kinematical stream’s stars mentioned in Montes et *** both convergent point and AD-diagram *** values of apex coordinates are:(A,D)CP=(6.~h17 ± 0.~h004,-6.°88 ± 0.°381;for cluster) and(6.~h07 ± 0.~h007,-5.°00 ± 0.°447;stream),and(A0,D0) =(6.~h12 ± 0.~h004,-3.°4 ± 0.°3;cluster) and(6.~h21 ±0.~h007,-11.°895 ± 0.°290;stream).The results are in good agreement with the previously calculated *** positions of the stars in the disk and the spatial dispersion velocities are *** paths of cluster and associated stream are traced in the disk by orbit calculation back in time to their places of formation.A possible genetic relationship between the cluster and stream has been *** approximation of the spatial and kinematical shape of the stream and the cluster is *** to this study,even though currently the cluster and stream seem to have a spatial difference in their locations,they appear to have formed in the same region of the Galactic disk.

关键词： stars:kinematics and dynamics Galaxy:stellar content (Galaxy:)open clusters and associations:individual:IC 2391

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Interaction of a root-knot nematode (Meloidogyne hapla) and plant intraspecific diversity in clover-grass communities

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Journal of Plant Ecology 2019年第1期12卷 1-9页

作者： Xiaohui Guo Jana s.Petermann susanne Wurst Dahlem Centre of Plant sciences Institute of BiologyFreie Universität BerlinKönigin-Luise-Str.1-3Berlin D-14195Germany Key Laboratory of Biological and Ecological Engineering Ministry of EducationInstitute of Biodiversity ScienceFudan UniversitySonghu Road 2005Shanghai 200438China Berlin-Brandenburg Institute of Advanced Biodiversity Research Altensteinstr.34Berlin D-14195Germany Department of Ecology and Evolution University of SalzburgHellbrunnerstr.34Salzburg 5020Austria

Aims soil organisms can influence the plant diversity-productivity rela-tionship at species level;however,little is known about their role in the relationship at an intraspecific *** study aimed to investigate the interaction between the effects of plant intraspe-cific diversity and a root-knot nematode on primary production and community *** A greenhouse experiment was conducted by using intraspecific diversity of a clover-grass community through sowing 2-,4-,8-and 16-cultivar mixtures of Trifolium pratense *** Lolium perenne *** by adding the nematode Meloidogyne *** investigated the effects of plant intraspecific diversity and *** on biomass of plant community,biomass of cultivar individuals and community *** Findings We found that *** dominated the communities,yet its bio-mass was not affected by the *** hapla influ-enced the effect of plant intraspecific diversity on aboveground biomass of *** at the four-cultivar mixture level of plant intraspecific *** evenness increased linearly with increasing plant intraspecific diversity,and *** affected community evenness at the four-cultivar mixture *** ***-ense and *** cultivars differed in aboveground *** on plant intraspecific diversity and cultivar identity,nematode addition positively affected the aboveground biomass of *** *** response of *** cultivars to *** and to various plant intraspecific diversity levels influenced the intraspecific diversity-productivity *** study high-lights the influence of *** on the effect of plant intraspecific diversity on aboveground biomass of ***,suggesting that future research on the impact of intraspecific plant diversity on eco-system functions should consider the effects of soil organisms.

关键词： nematode diversity-productivity relationship biomass legume-grass community