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Influence of B4C and ZrB2 reinforcements on microstructural,mechanical and wear behaviour of AA 2014 aluminium matrix hybrid composites

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Defence Technology（防务技术） 2024年第10期40卷 242-254页

作者： ramesh Babu r rajendran C Saiyathibrahim A rajkumar Velu Department of Mechanical Engineering Karpagam Institute of TechnologyCoimbatore 641105India Department of Mechanical Engineering Sri Krishna College of Engineering and TechnologyCoimbatore 641008India Department of Mechanical Engineering Indian Institute of Technology JammuJammu and Kashmir 181221India

Considering their affordability and high strength-to-weight ratio,lightweight aluminium alloys are the subject of intensive research aimed at improving their properties for use in the aerospace *** research effort aims to develop novel hybrid composites based on AA 2014 alloy through the use of liquid metallurgy stir casting to reinforce dual ceramic particles of Zirconium Diboride(ZrB_(2))and Boron Carbide(B4C).The weight percentage(wt%)of ZrB_(2) was varied(0,5,10,and 15),while a constant 5 wt%of B4C was maintained during this *** as-cast samples have been assessed using an Optical Microscope(OM)and a Scanning Electron Microscope(SEM)with Energy Dispersive Spectroscopy(EDS).The properties such as hardness,tensile strength,and wear characteristics of stir cast specimens were assessed to examine the impact of varying weight percentages of reinforcements in AA 2014 *** particular,dry sliding wear behaviour was evaluated considering varied loads using a pin-on-disc *** the weight%of ZrB_(2) grew and B4C was incorporated,hybrid composites showed higher hardness,tensile strength,and wear ***,the incorporation of a cumulative reinforcement consisting of 15 wt%ZrB_(2) and 5 wt%B4C resulted in a significant 31.86%increase in hardness and a 44.1%increase in tensile strength compared to AA 2014 *** addition,it has been detected that wear resistance of hybrid composite pin(containing 20 wt%cumulative reinforcement)is higher than that of other stir cast wear test pins during the whole range of applied *** surfaces of tensile specimens showed ductile fracture in the AA 2014 matrix and mixed mode for hybrid *** surfaces obtained employing higher applied load indicated abrasive wear with little plastic deformation for hybrid composites and dominant adhesive wear for matrix ***,the superior mechanical and tribological performance of hybrid composites can be attributed to dual reinforcement pa

关键词： AA 2014 alloy Stir casting Hybrid composite Hardness Tensile strength Specific wear rate

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Genomic selection in plant breeding:Key factors shaping two decades of progress

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Molecular Plant 2024年第4期17卷 552-578页

作者： Admas Alemu Johanna Astrand Osval A.Montesinos-López Julio Isidro y Sanchez Javier Fernandez-Gónzalez Wuletaw Tadesse ramesh r.Vetukuri Anders S.Carlsson Alf Ceplitis JoséCrossa rodomiro Ortiz Aakash Chawade Department of Plant Breeding Swedish University of Agricultural SciencesAlnarpSweden Lantmannen Lantbruk SvalövSweden Facultad de Telematica University de ColimaColimaColima 28040Mexico Centro de Biotecnología y Genómica de Plantas(CBGP UPM-INIA)Universidad Politécnica de Madrid(UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria(INIA)Campus de Montegancedo-UPM28223 MadridSpain International Center for Agricultural research in the Dry Areas(ICArDA) RabatMorocco International Maize and Wheat Improvement Center(CIMMYT) Km 45Carretera México-VeracruzTexcocoMéxico 52640Mexico

Genomic selection,the application of genomic prediction(GP)models to select candidate individuals,has significantly advanced in the past two decades,effectively accelerating genetic gains in plant *** article provides a holistic overview of key factors that have influenced GP in plant breeding during this *** delved into the pivotal roles of training population size and genetic diversity,and their relationship with the breeding population,in determining GP *** emphasis was placed on optimizing training population *** explored its benefits and the associated diminishing returns beyond an optimum *** was done while considering the balance between resource allocation and maximizing prediction accuracy through current optimization *** density and distribution of single-nucleotide polymorphisms,level of linkage disequilibrium,genetic complexity,trait heritability,statistical machine-learning methods,and non-additive effects are the other vital *** wheat,maize,and potato as examples,we summarize the effect of these factors on the accuracy of GP for various *** search for high accuracy in GP—theoretically reaching one when using the Pearson’s correlation as a metric—is an active research area as yet far from optimal for various *** hypothesize that with ultra-high sizes of genotypic and phenotypic datasets,effective training population optimization methods and support from other omics approaches(transcriptomics,metabolomics and proteomics)coupled with deep-learning algorithms could overcome the boundaries of current limitations to achieve the highest possible prediction accuracy,making genomic selection an effective tool in plant breeding.

关键词： genomic selection genetic gain genomic prediction optimization deep learning training population optimization

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Binder-free heterostructure(g-C3N4/PPy) based thin film on semi-flexible nickel foam via hybrid spray technique for energy storage application

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Progress in Natural Science:Materials International 2020年第3期30卷 298-307页

作者： Navaneethan Duraisamy Prabhu S ramesh r Kavitha Kandiah Department of Chemistry J.K.K.Nataraja College of Arts and Science Komarapalayam 2. Department of Physics Periyar University Department of Microbiology Periyar University Center for New and renewable Energy Department of Physics Periyar University

A semi-flexible binder-free graphitic carbon nitride(g-CN) intercalated polypyrrole(PPy) nanocomposite thin film was prepared via hybrid electrospray technique. A homogeneous thin film was achieved by the controlled spray process. A deposited thin film illustrated the amorphous nature of composite with high surface purity and good chemical composition. The surface analysis confirmed the smoother surface with well-defined distinct phases of g-CNand PPy matrix in the composite thin film. The electrochemical studies exhibited that a maximum areal capacity of the thin film was achieved to be 289.6 mF/cm~2 at a current density of 0.4 mA/cm~2,which is higher than that of pristine PPy(194.8 mF/cm~2). The heterostructure electrode illustrated that the life cycles of 99% could be up to 10,000 cycles with low resistance due to the synergetic effect of g-CNand PPy matrix with strong material adhesion(hybrid spray process) on the surface. A binder-free heterostructure thin film will play a significant role in the energy storage application.

关键词： Polypyrrole G-C3N4 Heterostructure Spray Thin film Electrochemical study

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Investigation of dry sliding wear properties of multi-directional forged Mg-Zn alloys

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Journal of Magnesium and Alloys 2019年第3期7卷 444-455页

作者： S.ramesh Gajanan Anne H.Shivananda Nayaka Sandeep Sahu M.r.ramesh Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal 575025India Department of Mechanical Engineering Shri Madhwa Vadiraja Institute of Technology and ManagementUdupiKarnataka 574115India Department of Materials Science and Engineering Indian Institute of Technology KanpurKanpur 208016India

Effect of multi-directional forging(MDF)on wear properties of Mg-Zn alloys(with 2,4,and 6wt%Zn)is *** sliding wear test was performed using pin on disk machine on MDF processed and homogenized *** behavior of samples was analyzed at loads of ION and 20 N,with sliding distances of 2000m and 4000m,at a sliding velocity of 3m/*** of worn samples were observed under scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and x-ray diffraction(XrD)and the results were *** properties were evaluated using microhardness *** 5 passes of MDF,the average grain size was found to be 30±4p m,22±3 pm,and 18±3 pm,in Mg-2%Zn,Mg-4%Zn,and Mg-6%Zn alloys,respectively,with significant improvement in hardness in all *** resistance was improved after MDF processing,as well as,with increment in Zn content in Mg ***,it decreased when the load and the sliding distance *** surface exhibited ploughing,delamination,plastic deformation,and wear debris along sliding direction,and abrasive wear was found to be the main mechanism.

关键词： Multi-directional forging Mg-Zn alloy Microhardness Wear Coefficient of friction

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Measurement of bit-rock interface temperature and wear rate of the tungsten carbide drill bit during rotary drilling

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Friction 2020年第6期8卷 1073-1082页

作者： Vijay Kumar SHANKAr Bijay Mihir KUNAr Chivukula Suryanarayana MUrTHY M r ramesh Department of Mining Engineering National Institute of Technology KarnatakaSurathkal 575025India Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal 575025India

rock drilling is an essential operation in mining *** at the bit-rock interface plays a major role in the wear rate of the drill *** paper primarily focuses on the wear rate of tungsten carbide(WC)drill bit and the interrelationship between temperature and wear rate during rotary drilling operations conducted using a computer numerical control(CNC)*** interrelationship between the temperature and wear rate was studied with regard to three types of rock samples,i.e.,fine-grained sandstone(FG)of uniaxial compressive strength(UCS)that is 17.83 MPa,medium-grained sandstone(MG)of UCS that is 13.70 MPa,and fine-grained sandstone pink(FGP)of UCS that is 51.67 *** rate of the drill bit has been measured using controlled parameters,i.e.,drill bit diameter(6,8,10,12,and 16 mm),spindle speed(250,300,350,400,and 450 rpm),and penetration rate(2,4,6,8,and 10 mm/min),***,a fully instrumented laboratory drilling set-up was *** weight of each bit was measured after the bit reached 30 mm depth in each type of the rock ***,effects of the bit-rock interface temperature and operational parameters on wear rate of the drill bits were *** results show that the wear rate of drill bits increased with an increase in temperature for all the bit-rock combinations *** is due to the silica content of the rock sample,which leads to an increase in the frictional heat between the bit-rock ***,in case of medium-grained sandstone,the weight percentage(wt%)of SiO2 is around 7.23 wt%,which presents a very low wear rate coefficient of 6.33×10^–2 mg/(N?m).Moreover,the temperature rise during drilling is also minimum,i.e.,around 74℃,in comparison to that of fine-grained sandstone and fine-grained sandstone *** addition,this paper develops the relationship between temperature and wear rate characteristics by employing simple linear regression analysis.

关键词： temperature wear rate drilling simple linear regression

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User Centric Block-Level Attribute Based Encryption in Cloud Using Blockchains

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Computer Systems Science & Engineering 2022年第8期42卷 605-618页

作者： S.Godfrey Winster A.Siva Kumar r.ramesh Department of Computer Science and Engineering School of ComputingCollege of Engineering and TechnologySRM Institute of Science and TechnologyChengalpattu603203India Department of Information Technology Sri Sai Ram Engineering CollegeChennai600044India Department of Electronics and Communication Engineering Saveetha Engineering CollegeChennai602105India

Cloud computing is a collection of distributed storage Network which can provide various services and store the data in the efficient *** advantages of cloud computing is its remote access where data can accessed in real time using remote Method Innovation(rMI).The problem of data security in cloud environment is a major concern since the data can be accessed by any time by any *** to the lack of providing the efficient security the cloud computing they fail to achieve higher performance in providing the efficient *** improve the performance in data security,the block chains are used for securing the data in the cloud ***,the traditional block chain technique are not suitable to provide efficient security to the cloud data stored in the *** this paper,an efficient user centric block level Attribute Based Encryption(UCBL-ABE)scheme is presented to provide the efficient security of cloud data in cloud *** proposed approach performs data transaction by employing the block *** proposed system provides efficient privacy with access control to the user access according to the behavior of cloud user using Data Level Access Trust(DLAT).Based on DLAT,the user access has been restricted in the cloud *** proposed protocol is implemented in real time using Java programming language and uses IBM *** implementation results justifies that the proposed system can able to provide efficient security to the data present in and cloud and also enhances the cloud performance.

关键词： Cloud blockchain data security ABE block-level

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Logistic regression Trust–A Trust Model for Internet-of-Things Using regression Analysis

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Computer Systems Science & Engineering 2023年第2期44卷 1125-1142页

作者： Feslin Anish Mon Solomon Godfrey Winster Sathianesan r.ramesh Department of CSE Saveetha Engineering CollegeChennaiIndia Department of CSE SRM Institute of Science and TechnologyChennaiIndia Department of ECE Saveetha Engineering CollegeChennaiIndia

Internet of Things(IoT)is a popular social network in which devices are virtually connected for communicating and sharing *** is applied greatly in business enterprises and government sectors for delivering the services to their customers,clients and ***,the interaction is success-ful only based on the trust that each device has on *** trust is very much essential for a social *** Internet of Things have access over sen-sitive information,it urges to many threats that lead data management to *** issue is addressed by trust management that help to take decision about trust-worthiness of requestor and provider before communication and *** trust-based systems are existing for different domain using Dynamic weight meth-od,Fuzzy classiﬁcation,Bayes inference and very few regression analysis for *** proposed algorithm is based on Logistic regression,which provide strong statistical background to trust *** make our stand strong on regression support to trust,we have compared the performance with equivalent sound Bayes analysis using Beta *** performance is studied in simu-lated IoT setup with Quality of Service(QoS)and Social parameters for the *** proposed model performs better in terms of various *** IoT connects heterogeneous devices such as tags and sensor devices for sharing of information and avail different application *** most salient features of IoT system is to design it with scalability,extendibility,compatibility and resiliency against *** existing worksﬁnds a way to integrate direct and indirect trust to con-verge quickly and estimate the bias due to attacks in addition to the above features.

关键词： LrTrust logistic regression trust management internet of things

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Functional trait and community phylogenetic analyses reveal environmental filtering as the major determinant of assembly of tropical forest tree communities in the Western Ghats biodiversity hotspot in India

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Forest Ecosystems 2018年第4期5卷 345-360页

作者： K.Nagaraju Shivaprakash B.r.ramesh ramanan Umashaanker Selvadurai Dayanandan Centre for Structural and Functional Genomics Biology Department Concordia University7141 Sherbrooke WestMontrealQC H4BIR6Canada Quebec Centre for Biodiversity Sciences 1205Dr.Penfield AvenueMontreal QC H3A1B1Canada Suri Sehgal Centre for Biodiversity and Conservation Ashoka Trust for Research In Ecology and the EnvironmentRoyal Enclave SriramapuraJakkur PostBangaloreKarnataka 560064India French Institute of Pondicherry 11 Saint Louis StreetP.O.Box 33Pondicherry 605001India Department of Crop Physiology University of Agricultural SciencesBangalore India.

Background: Improved understanding of the processes shaping the assembly of tropical tree communities is crucial for gaining insights into the evolution of forest communities and biological diversity. The climate is thought to be the first order determinant of abundance and distribution patterns of tree species with contrasting traits such as evergreen and deciduous leaf phenology. However, the relative role of neutral, and niche-based processes in the evolution of these patterns remain poorly ***: Here, we perform an integrated analysis of the data on tree species abundance, functional traits and community phylogeny from a network of 96 forest plots, each 1 ha in size, distributed along a broad environmental gradient in the central Western Ghats, India. Then, we determine the relative importance of various process in assembly and structuring of tropical forest communities with evergreen and deciduous leaf ***: The deciduous leaf phenological trait has repeatedly evolved among multiple distantly related lineages. Tree communities in dry deciduous forests were phylogenetically clustered and showed a low range and variance of functional traits related to light harvesting, reproduction, and growth suggesting niche-based processes such as environmental filtering play a vital role in the assembly of tree communities in these forests. The external factors such as human-mediated disturbance also significantly, but to a lesser extent, influences the species and phylogenetic ***: These findings revealed that the environmental filtering plays a significant role in assembly of tree communities in the biologically diverse tropical forests in the Western Ghats biodiversity hotspot.

关键词： Functional traits Phylogenetic turnover Deciduous Evergreen Niche-based processes Human disturbance

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Immuolocalization of nestin in pancreatic tissue of mice at different ages

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World Journal of Gastroenterology 2008年第46期14卷 7112-7116页

作者： raj K Dorisetty Sashi G Kiran Malathi r Umrani Sesikeran Boindala ramesh r Bhonde Vijayalakshmi Venkatesan Department of Biochemistry National Institute of Nutrition Tissue Engineering and Banking Laboratory National Center for Cell SciencePune University Campus

AIM： To localize nestin positive cells （NPC） in pancreatic tissue of mice of different ages. METHODS： Paraffin sections of 6-8 um of fixed pancreatic samples were mounted on poly-L-lysine coated slides and used for Immunolocalization using appropriate primary antibodies （Nestin, Insulin, Glucagon）, followed by addition of a fluorescently labeled secondary antibody. The antigen-antibody localization was captured using a confocal microscope （Leica SP 5 series）. rESULTS： In 3-6 d pups, the NPC were localized towards the periphery of the endocrine portion, as evident from immunolocalization of insulin and glucagon, while NPC were absent in the acinar portion. At 2 wk, NPC were localized in both the exocrine and endocrine portions. Interestingly, in 4-wk-old mice NPC were seen only in the endocrine portion, towards the periphery, and were colocalised with the glucagon positive cells. In the pancreas of 8- wk-old mice, the NPC were predominantly localized in the central region of the islet clusters, where immunostaining for insulin was at a maximum. CONCLUSION： We report for the first time the immunolocalization of NPC in the pancreas of mice of different ages （3 d to 8 wk） with reference to insulin and glucagon positive cells. The heterogeneous localization of the NPC observed may be of functional and developmental significance and suggest（s） that mice pancreatic tissue can be a potential source of progenitor cells. NPC from the pancreas can be isolated, proliferated and programmed to differentiate into insulin secreting cells under the appropriate microenvironment.

关键词： Nestin Insulin Glucagon Immunolocalization Mice

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Sliding wear characteristics of solid lubricant coating on titanium alloy surface modified by laser texturing and ternary hard coatings

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Transactions of Nonferrous Metals Society of China 2017年第4期27卷 839-847页

作者： M.PrEM ANANTH r.ramesh Department of Mechanical Engineering Sri Venkateswara College of EngineeringSriperumbudur Chennai-602117 Tamilnadu India

Titanium alloys are poor in wear resistance and it is not suitable under sliding conditions even with lubrication because ofits severe adhesive wear *** surface modifications through texturing and surface coating were used to enhance the surfaceproperties of the titanium alloy *** and wear resistant coatings such as TiAlN and AlCrN were applied over texturedtitanium alloy surfaces with chromium as *** improve the friction and wear resisting performance of hard coatings further,solid lubricant,molybdenum disulphide(MoS2),was deposited on dimples made over hard *** sliding weartests were performed with pin on disc contact geometry,to evaluate the tribological performance of coated *** tests wereperformed under three different normal loads for a period of40min at sliding velocity of2m/*** tribological behaviours ofmulti-layer coatings such as coating structure,friction coefficient and specific wear rate were investigated and *** lowerfriction coefficient of approximately0.1was found at the early sliding stage,which reduces the material transfer and increases thewear ***,the friction coefficient increased to high values after MoS2coating was partially removed,substrate was stillprotected against wear by underlying hard composite layer.

关键词： surface texturing chromium interlayer hard coating molybdenum disulphide dry sliding

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