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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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Effect of tool tilt angle on strength and microstructural characteristics of friction stir welded lap joints of AA2014-T6 aluminum alloy

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Transactions of Nonferrous Metals Society of china 2019年第9期29卷 1824-1835页

作者： c.rajendran K.SRINIVASAN V.BALASUBRAMANIAN H.BALAJI P.SELVARAJ Department of Mechanical Engineering Sri Krishna College of Engineering and TechnologyCoimbatore Tamil Nadu 641008India center for Materials Joining and Research(cEMAJOR) Annamalai UniversityTamil Nadu 608002India Aeronautical Development Agency BangaloreKarnataka 560017India

Friction stir welding(FSW)has been extensively adopted to fabricate aluminium alloy joints by incorporating various welding parameters that include welding speed,rotational speed,diameters of shoulder and pin and tool tilt *** parameters significantly affect the weld *** tilt angle is one of the significant process parameters among the weld *** present study focused on the effect of tool tilt angle on strength of friction stir lap welding of AA2014-T6 aluminium *** tool tilt angle was varied between 0°and 4°with an equal increment of 1°.Other process parameters were kept *** and microstructure analysis,microhardness measurement,scanning electron micrograph,transmission electron micrograph and energy dispersive spectroscopy analysis were performed to evaluate the lap shear strength of friction stir lap welded *** proved that,defect-free weld joint was obtained while using a tool tilt angle of 1°to 3°.However,sound joints were welded using a tool tilt angle of 2°,which had the maximum lap shear strength of 14.42 kN and microhardness of HV *** joints welded using tool tilt angles of 1°and 3°yielded inferior lap shear strength due to unbalanced material flow in the weld region during FSW.

关键词： AA2014 aluminium alloy friction stir lap welding tool tilt angle lap shear strength microstructure

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Vertebral column deformity in six species of wild fish at the coromandel coast,Bay of Bengal India

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Aquaculture and Fisheries 2024年第4期9卷 635-641页

作者： Yosuva Mariasingarayan Jeyapragash Danaraj Bharathidasan Veeraiyan Per Gunnar Fjelldal Kannan Karuppiah rajendran Narayanasamy centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai UniversityParangipettaiTamil Nadu608502India Reef Biology Research Group Centre of Excellence for Marine BiologyDepartment of Marine ScienceFaculty of ScienceChulalongkorn UniversityBangkok10330Thailand centre for Ocean Research(DST-FIST Sponsored centre) MoES-Earth Science and Technology Cell(Marine Biotechnological Studies)Col.Dr.Jeppiaar Research ParkSathyabama Institute of Science and TechnologyChennaiTamil Nadu600119India Reproduction and Developmental Biology Institute of Marine Research(IMR)Matre Research StationMatredal5984Norway Department of Zoology Kongunadu Arts and Science CollegeCoimbatoreTamil Nadu641008India PG&Research Department of Zoology Government ArtsCollegeC.MulturChidambaramTamilnadu608102India

This study reports radiological deformities in the vertebral column of six fishes viz,Scomberomorus commerson,chanos chanos,Sillago sihama,Pampus chinensis,Rastrelliger kanagurta and Netuma thalassina that were collected from the coromandel coast,Bay of *** main different types of vertebral column deformities were found:(i)whole body kypho-lordo-kyphosis(Sillago sihama,Rastrelliger kanagurta,Netuma thalassina);(ii)tail region kypho-lordosis(Scomberomorus commerson);(iii)tail region lordo-kyphosis(chanos chanos);(iv)platyspondyly(Pampus chinensis).Seven types of vertebra body deformities,describing the pathology of single vertebrae,were present;reduced intervertebral space,compression,fusion,compresion&fusion,fusion center,dorsal wedge-shaped and compressed&dorsal *** present documentation of deformities in six different species that are also very different with regard to habitat,diet and swimming activity may suggest that fish deformities are widespread in the study area.

关键词： Vertebral column Abnormality Kyphosis Lordosis Scoliosis Platyspondyly coromandel coast

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印度咖啡的新病害—咖啡疫病

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世界热带农业信息 1985年第5期 48-50页

作者： c. rajendran 陆佑军

1981年6月,印度卡纳塔克邦有两个咖啡园的小粒种咖啡发生异常落叶。病株落叶程度达30—35％或更多。感病地区的老龄和幼龄植株都不同程度受害。在季风期间雾气较重的高海拔地区(约1500米)发病更为严重。当地易感此病的小粒种咖啡有gents... 详细信息

1981年6月,印度卡纳塔克邦有两个咖啡园的小粒种咖啡发生异常落叶。病株落叶程度达30—35％或更多。感病地区的老龄和幼龄植株都不同程度受害。在季风期间雾气较重的高海拔地区(约1500米)发病更为严重。当地易感此病的小粒种咖啡有gents,S.795,S.1934,圣雷蒙和其他几个入选品

关键词：咖啡针刺接种感病叶片印度南亚疫病

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Role of diet in the management of inflammatory bowel disease

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World Journal of Gastroenterology 2010年第12期16卷 1442-1448页

作者： Nirooshun rajendran Devinder Kumar Department of General Surgery 3rd FloorSt James WingSt George's Hospital

Many studies have looked at connections between diet,etiology,signs and symptoms associated with inflammatory bowel disease(IBD).Although these connections are apparent to clinicians,they are difficult to prove qualitatively or *** feeding and polymeric diets are equally effective at bringing about remission in crohn's disease(cD).Parenteral feeding is also effective,although none of these methods is as effective as corticosteroid ***,enteral feeding is preferred in the pediatric population because linear growth is more adequately maintained via this *** diets in patients brought into remission using an elemental diet have been shown to maintain remission for longer *** that aim to isolate culpable food groups have shown that individuals react differently on exposure to or exclusion of various *** commonly identifi ed food sensitivities are cereals,milk,eggs,vegetables and citrus *** that have looked at gut mucosal antigen behavior have shown higher rectal blood flow,in response to specifi c food antigens,in those with cD over healthy *** of sugar shows little evidence of amelioration in *** 3 fatty acids show promise in the treatment of IBD but await larger randomized controlled *** frequently notice that specifi c foods cause aggravation of their *** it has been diffi cult to pinpoint specifi c foods,with advances in the laboratory tests and food supplements available,the aim is to prolong remission in these patients using dietary measures,and reduce the need for pharmacotherapy and surgical intervention.

关键词： crohn’s disease Ulcerative colitis Exclusion diet Elimination diet

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High Prevalent Hypovitaminosis D Is Associated with Dysregulation of calcium-parathyroid Hormone-vitamin D Axis in Patients with chronic Liver Diseases

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Journal of clinical and Translational Hepatology 2019年第1期7卷 15-20页

作者： Krishnasamy Narayanasamy rajendran Karthick A.Koodal Raj Department of Hepatology Madras Medical CollegeChennaiTamil NaduIndia Multidisciplinary Research Unit(MRU) Madras Medical CollegeChennaiTamil NaduIndia

Background and Aims:Although hypovitaminosis D is common among patients with chronic liver disease(cLD),the data are inconsistent on its prevalence and its relationship with *** study aimed to estimate the prevalence of hypovitaminosis D among patients with cLD and to determine the relationship between hypovitaminosis D and severity of liver dysfunction,and calcium(ca),phosphate(PO4)and parathyroid hormone(PTH)levels in ***:The study included 236 cLD patients attending the Department of Hepatology,Rajiv Gandhi Government General Hospital(chennai,India).Serum levels of 25-hydroxyvitamin D(25(OH)D),PTH,ca,and PO4 were *** of liver dysfunction was graded using the child-Turcotte-Pugh(cTP)***:The first report from our population showed that 162 of 236(68.6%)cLD patients had hypovitaminosis D(25(OH)D levels ofcy(124/162)76.5%among cTP B,c *** negative correlation(r=-0.288,p=0.0001)between 25(OH)D and cTP scores was noted in hypovitaminosis D *** of 25(OH)D was correlated negatively with PTH(r=-0.537,p=0.0001),positively with ca(r=0.657,p=0.0001),and positively with PO4(r=0.477,p=0.0001)in sufficient vitamin D ***:Hypovitaminosis D is associated with higher cTP scores and is strongly associated with dysregulation of the ca-PTH-vitamin D axis in *** measurement of vitamin D levels is essential,along with levels of PTH,ca and PO4,to manage cLD patients.

关键词： Hypovitaminosis D chronic liver disease Liver dysfunction Hypocalcemia Vitamin D

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2D-titanium carbide(MXene)based selective electrochemical sensor for simultaneous detection of ascorbic acid,dopamine and uric acid

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Journal of Materials Science & Technology 2021年第13期72卷 122-131页

作者： Nagaraj Murugan rajendran Jerome Murugan Preethika Anandhakumar Sundaramurthy Ashok K.Sundramoorthy Department of chemistry SRM Institute of Science and TechnologyKattankulathur603203Tamil NaduIndia SRM Research Institute SRM Institute of Science and TechnologyKattankulathur603203Tamil NaduIndia

Two-dimensional(2 D)titanium carbide(MXene)nanosheets exhibited excellent conductivity,flexibility,high volumetric capacity,hydrophilic surface,thermal stability,***,it has been exploited in various ***,we report synthesis of mixed phase 2 D MXene as a catalytic material for simultaneous detection of important biomolecules such as ascorbic acid(AA),dopamine(DA)and uric acid(UA).crystalline structure,surface morphology and elemental composition of mixed phase titanium carbide(Ti-c-T_(x))MXene(T_(x)=-F,-OH,or-O)nanosheets were confirmed by X-ray diffraction(XRD),Raman spectroscopy,high-resolution transmission electron microscopy(HR-TEM),high-re solution scanning electron microscopy(HR-SEM)and Energy-dispersive X-ray spectroscopy(EDS)mapping ***,Ti-c-T_(x) modified glassy carbon electrode(GcE)was prepared and its electrochemical properties are studied by cyclic voltammetry(cV)and diffe rential pulse voltammetry(DPV).It was found that Ti-c-T_(x) modified GcE(Ti-c-T_(x)/GcE)showed excellent electrocatalytic activity and separated oxidation peaks of important biomolecules such as AA(at 0.01 V),DA(at 0.21 V)and UA(at 0.33 V).Also,Ti-c-T_(x)/GcE sensor is enabled their simultaneous detection in physiological pH from 100 to 1000μM for AA,0.5-50μM for DA and 0.5-4μM&100-1500μM for *** limit of detection’s(LOD)was estimated as 4.6μM,0.06μM and 0.075μM for AA,DA and UA,***,real sample analysis indicated that spiked AA,DA and UA can be determined accurately by Ti-c-T_(x)/GcE with the recovery ratio in the range between 100.5%-103%in human urine *** proposed Ti-c-T_(x) modified electrode exhibited good stability,selectivity and reproducibility as an electrochemical sensor for the detection of AA,DA and UA molecules.

关键词： Titanium carbide Dopamine Uric acid Ascorbic acid Electrochemical sensor

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Umbilical cord blood stem cell treatment for a patient with psoriatic arthritis

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World Journal of Stem cells 2017年第12期9卷 235-240页

作者： Margaret coutts Rowena Soriano rajendran Naidoo Habib Torfi Invitrx Therapeutics IrvineCA 92618United States

clinical and laboratory results document psoriatic arthritis in a 56-year old patient. The symptoms did not resolve with standard treatments(nonsteroidal anti-inflammatory drugs, steroids and methotrexate). TNF-alpha inhibitors(certolizumab pegol and adalimumab) were added to the treatment regime, with some adverse effects. A trial of human umbilical cord stem cell therapy was then initiated. The stem cells were enriched and concentrated from whole cord blood, by removal of erythrocytes and centrifugation. The patient received several infusions of cord blood stem cells, through intravenous and intra-articular injections. These stem cell treatments correlated with remission of symptoms(joint pain and psoriatic plaques) and normalized serologic results for the inflammatory markers c-reactive protein and erythrocyte sedimentation rate. These improvements were noted within the first thirty days post-treatment, and were sustained for more than one year. The results of this trial suggest that cord blood stem cells may have important therapeutic value for patients with psoriatic arthritis, particularly for those who cannot tolerate standard treatments.

关键词： Umbilical cord blood stem cells Stem cells Psoriatic arthritis Rheumatoid arthritis

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Peripheral octamethyl-substituted nickel(Ⅱ)-phthalocyanine-decorated carbon-nanotube electrodes for high-performance all-solid-state flexible symmetric supercapacitors

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Journal of Energy chemistry 2023年第1期76卷 214-225,I0006页

作者： Yu Wang Minzhang Li rajendran Ramachandran Haiquan Shan Qian chen Anxin Luo Fei Wang Zong-Xiang Xu Department of chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055GuangdongChina School of Microelectronics Southern University of Science and TechnologyShenzhen 518055GuangdongChina SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055GuangdongChina Engineering Research center of Integrated circuits for Next-Generation communications Ministry of EducationShenzhen 518055GuangdongChina

construction of advanced electrode materials with unique performance for supercapacitors(Scs)is essential to achieving high implementation in the commercial ***,we report a novel peripheral octamethyl-substituted nickel(Ⅱ)phthalocyanine(Ni Me_(2)Pc)-based nanocomposite as the electrode material of all-solid-state *** highly redox-active NiMe_(2)Pc/carboxylated carbon nanotube(cNTcOOH)dendritic nanocomposite provides rapid electron/electrolyte ion-transport pathways and exhibits excellent structural stability,resulting in high-capacity activity and impressive cycling *** composite prepared with the optimized weight ratio of Ni Me_(2)Pc:cNT-cOOH(6:10)showed the highest specific capacitance of 330.5 F g^(-1)at 0.25 A g^(-1).The constructed NiMe_(2)Pc/cNT-cOOH-based all-solid-state symmetric Sc device showed excellent performance with a maximum energy density of 22.8 Wh kg^(-1)and outstanding cycling stability(111.6%retained after 35,000 cycles).Moreover,flexible carbon cloth significantly enhanced the energy density of the NiMe_(2)Pc/cNT-cOOH all-solid-state symmetric device to 52.1 Wh kg^(-1)with 95.4%capacitance retention after 35,000 cycles,and it could be applied to highperformance flexible electronics *** findings provide a novel strategy to design phthalocyanine-based electrode materials for next-generation flexible Sc devices.

关键词： Nickel phthalocyanine carbon nanotubes Nanocomposites Flexible supercapacitors cycling stability

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Internet of Things Enabled Energy Aware Metaheuristic clustering for Real Time Disaster Management

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computer Systems Science & Engineering 2023年第5期45卷 1561-1576页

作者： Riya Kumarasamy Santhanaraj Surendran rajendran carlos Andres Tavera Romero Sadish Sendil Murugaraj Department of Information Technology Vel Tech Multi Tech Dr.Rangarajan Dr.Sakunthala Engineering CollegeChennai600062India center for Artificial Intelligence and Research(cAIR) Chennai Institute of TechnologyChennai600069India cOMBA R&D Laboratory Faculty of EngineeringUniversidad Santiago de CaliCali76001Colombia Department of Emerging Technologies Guru Nanak Institute of TechnologyIbrahipatnamTelangana501506India

Wireless Sensor Networks(WSNs)are a major element of Internet of Things(IoT)networks which offer seamless sensing and wireless *** management in smart cities can be considered as a safety critical ***,it becomes essential in ensuring network accessibility by improving the lifetime of IoT assisted *** and multihop routing are considered beneficial solutions to accomplish energy efficiency in IoT *** article designs an IoT enabled energy aware metaheuristic clustering with routing protocol for real time disaster management(EAMcR-RTDM).The proposed EAMcR-RTDM technique mainly intends to manage the energy utilization of nodes with the consideration of the features of the disaster *** achieve this,EAMcR-RTDM technique primarily designs a yellow saddle goatfish based clustering(YSGF-c)technique to elect cluster heads(cHs)and organize *** addition,enhanced cockroach swarm optimization(EcSO)based multihop routing(EcSO-MHR)approach was derived for optimal route *** YSGF-c and EcSO-MHR techniques compute fitness functions using different input variables for achieving improved energy efficiency and network *** design of YSGF-c and EcSO-MHR techniques for disaster management in IoT networks shows the novelty of the *** examining the improved outcomes of the EAMcR-RTDM system,a wide range of simulations were performed and the extensive results are assessed in terms of different *** comparative outcomes highlighted the enhanced outcomes of the EAMcRRTDM algorithm over the existing approaches.

关键词： Internet of things disaster management wireless sensor networks real time applications routing clustering

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