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Application of response surface methodology to maximize tensile strength and minimize interface hardness of friction welded dissimilar joints of austenitic stainless steel and copper alloy

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Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2250-2259页

作者： G. VAIRAMANI T. senthil kumar S. MALARVIZHI V. BALASUBRAMANIAN Department of Mechanical Engineering Seshasayee Institute of Technology Department of Mechanical Engineering Anna University of ChennaiTiruchirappalli Campus Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai University

An attempt was made to optimize friction welding parameters to attain a minimum hardness at the interface and a maximum tensile strength of the dissimilar joints of AISI 304 austenitic stainless steel （ASS） and copper （Cu） alloy using response surface methodology （RSM）. Three-factor, five-level central composite design matrix was used to specify experimental conditions. Twenty joints were fabricated using ASS and Cu alloy. Tensile strength and interface hardness were measured experimentally. Analysis of variance （ANOVA） method was used to find out significant main and interaction parameters and empirical relationships were developed using regression analysis. The friction welding parameters were optimized by constructing response graphs and contour plots using design expert software. The developed empirical relationships can be effectively used to predict tensile strength and interface hardness of friction welded ASS-Cu joints at 95% confidence level. The developed contour plots can be used to attain required level of optimum conditions to join ASS-Cu alloy by friction welding process.

关键词： friction welding austenitic stainless steel copper alloy tensile strength interface hardness response surface methodology

Growth of ZnSe∶Mn Nanocrystals from Vapour Phase

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Journal of Rare Earths 2006年第z1期24卷 111-114页

作者： O senthil kumar K Balkis Ameen S Soundeswaran T Rajasekharan R Dhanasekaran Crystal Growth Centre Anna University Chennai-600 025 India Defence Metallurgical Research Laboratory Hyderabad-500 058 India Crystal Growth Centre Anna University Chennai-600 025 India Defence Metallurgical Research Laboratory Hyderabad-500 058 India Crystal Growth Centre Anna University Chennai-600 025 India

ZnSe∶Mn nanocrystals were grown by chemical vapour transport method using the matrix of SiO2 aerogels. The cubic structure of the nanocrystals was confirmed by powder X-ray diffraction (XRD) and electron diffraction (ED) studies. The size of the crystals was observed using transmission electron microscope (TEM). The oxidation state of Mn in ZnSe nanocrystal was found using electron spin resonance (ESR) spectrum. The room temperature luminescence measurements show the peaks corresponding to both bandgap of the material and Mn in ZnSe.

关键词： Ⅱ-Ⅵ semiconductors nanocrystalline materials electron spin resonance

Performance, emission and combustion characteristics of CI engine fuelled with diesel and hydrogen

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Frontiers in Energy 2015年第4期9卷 486-494页

作者： R. senthil kumar M. LOGANATHAN E. James GUNASEKARAN Department of Mechanical Engineering Annamalai University Chi- dambaram 608002 India

Hydrogen （H2） is being considered as a primary automotive fuel and as a replacement for conventional fuels. Some of the desirable properties, like high flame velocity, high calorific value motivate us to use hydrogen fuel as a dual fuel mode in diesel engine. In this experiment, hydrogen was inducted in the inlet manifold with intake air. The experiments were conducted on a four stroke, single cylinder, water cooled, direct injection （DI）, diesel engine at a speed of 1500r/min. Hydrogen was stored in a high pressure cylinder and supplied to the inlet manifold through a water-and-air-based flame arrestor. A pressure regulator was used to reduce the cylinder pressure from 140 bar to 2 bar. The hydrogen was inducted with a volume flow rate of 41 pm, 61 pm and 81 pm, respectively by a digital volume flow meter. The engine performance, emission and combustion parameters were analyzed at various flow rates of hydrogen and compared with diesel fuel operation. The brake thermal efficiency （BTE） was increased and brake specific fuel consumption （BSFC） decreased for the hydrogen flow rate of 81 pm as compared to the diesel and lower volume flow rates of hydrogen. The hydrocarbon （HC） and carbon monoxide （CO） were decreased and the oxides of nitrogen （NOx） increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen. The heat release rate and cylinder pressure was increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen.

关键词： hydrogen brake thermal efficiency crankangle compressed ignition (CI)

Myosin XI Is Required for Actin-Associated Movement of Plastid Stromules

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Molecular Plant 2009年第6期2卷 1262-1272页

作者： senthil kumar A. Natesan James A. Sullivan John C. Gray Department of Plant Sciences University of Cambridge Downing Street Cambridge CB2 3EA UK Present address: Sir William Dunn School of Pathology University of Oxford South Parks Road Oxford OX1 3RE UK Present address: School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK

Stromules are highly dynamic stroma-filled tubules extending from the surface of plastids and occasionally interconnecting individual plastids, allowing the movement of complex biological molecules between the interconnected plastids. Experiments with inhibitors of cytoskeleton assembly have indicated the involvement of an actin-based system in stromule movement. However, the motor protein associated with the system had not been identified. Here, we present direct evidence that myosin XI is involved in the formation and movement of stromules in tobacco leaves. Application of 2,3-butanedione 2-monoxime, an inhibitor of myosin ATPase activity, resulted in the loss of stromules from tobacco leaf epidermal cells. Transient RNA interference of myosin XI in leaves of Nicotiana benthamiana also resulted in the loss of stromules from epidermal cells, without any effect on transcripts for actin or myosin VIII. Transient expression of a GFP- tagged myosin XI tail domain in tobacco leaf epidermal cells showed that the fusion protein localized to the chloroplast envelope, as well as to mitochondria and other organelles. Our findings identify myosin XI as a key protein involved in the formation and movement of stromules.

关键词： Chloroplast biology cytoskeleton organelle biogenesis/function tobacco.

Ethnobotanical survey of medicinal plants used in the management of cancer and diabetes

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Journal of Traditional Chinese Medicine 2020年第6期40卷 1007-1017页

作者： Garima Singh Ajit kumar Passari Marcy D Momin Sakthivel Ravi Bhim Pratap Singh Nachimuthu senthil kumar Department of Biotechnology Mizoram UniversityAizawl 796004India Department of Botany Pachhunga University CollegeAizawl 796001India Departamento de Biologia Molecular y Biotecnologia Instituto de Investigaciones BiomedicasUniversidad Nacional Autonoma de Mexico(UNAM)Ciudad de Mexico-04510Mexico Department of Agriculture&Environmental Sciences(AES) National Institute of Food Technology Entrepreneurship&Management(NIFTEM)SonepatHaryanaIndia

OBJECTIVE:To conduct an ethnobotanical survey and document the traditional anticancer and antidiabetic plants used by the local tribes of Mizoram,Northeast ***:A systematic survey was conducted in rural and urban areas of Mizoram by interviewing traditional practitioners,and cancer and diabetes patients.A detailed literature search was carried out using MEDLINE and SCOPUS and available literatures were selected and included in the *** use value(UV)of the selected plants was calculated based on the number of citations per species given by ***:Data was obtained for 201 traditional medicinal plants from Mizoram,Northeast *** plants were from 72 different families and belonged to 140 *** these,103 plants were reported for the first time as possessing either anticancer or antidiabetic potential,and 105 plants were identified that were used for the treatment of both *** plants(Phlogacanthus thysiformis,Solanum gilo and Lobelia angulata)with antidiabetic potential,and six plants(Dillenia scabrella,Circium sinesis,Eupatorium nodiflorum,Pratia begonifolia,Vernonia teres and Plantago erosa)with both as anticancer and antidiabetic potential were documented for the first ***:In this study,we documented several explored and unexplored medicinal plants that may be useful for the management of cancer and *** study suggests that there is a broad scope fordeveloping potent anticancer and antidiabetic agent from the flora of Mizoram,Northeast India.

关键词： Plants medicinal Antineoplastic agents Hypoglycemic agents Ethanobotanical survey Traditional knowledge

Modeling and analysis of surface roughness on machining of Nimonic C-263 alloy by PVD coated carbide insert

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Transactions of Nonferrous Metals Society of China 2011年第9期21卷 1986-1994页

作者： C. EZILARASAN V. S. senthil kumar A. VELAYUDHAM K. PALANIkumar Department of Mechanical Engineering Anna University Chennai Combat Vehicles Research and Development Establishment Sri Sairam Institute of Technology

The effects of the cutting parameters （cutting speed, feed rate and depth of cut） on the surface roughness in machining the Nimonic C-263 alloy were investigated. The experiments were conducted using Taguchi＇s experimental design. The effect of cutting parameters on surface roughness was evaluated and the optimum cutting conditions for minimizing the surface roughness were determined. A second order model was established between the cutting parameters and surface roughness, using the response surface methodology. The experimental results revealed that among the parameters considered, the feed rate is the most significant which influences the surface roughness, followed by the cutting speed. The predicted values and measured values are fairly close, which indicates that the developed model can be effectively used to predict the surface roughness in machining the Nimonic C-263 alloy. The predicted values are validated using the additive law.

关键词： Nimonic C-263 alloy surface roughness response surface method

Effect of Pulsed Current TIG Welding Parameters on Pitting Corrosion Behaviour of AA6061 Aluminium Alloy

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Journal of Materials Science & Technology 2007年第2期23卷 223-229页

作者： T.senthil kumar V.Balasubramanian M.Y.Sanavullah S.Babu Department of Automobile Technology Bharathidasan UniversityTiruchirappalli 620 024India Department of Manufacturing Engineering Annamalai UniversityAnnamalainagar 608 002India Principal V.M.K.V.Engineering CollegeSalem 636 308India

Medium strength aluminium alloy （Al-Mg-Si alloy） has gathered wide acceptance in the fabrication of light weight structures requiring a high strength-to weight ratio, such as transportable bridge girders, military vehicles, road tankers and railway transport systems. The preferred welding process for aluminium alloy is frequently TIG （tungsten inert gas） welding due to its comparatively easier applicability and better *** the case of single pass TIG welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. The use of pulsed current parameters has been found to improve the mechanical properties of the welds compared to those of continuous current welds of this alloy due to grain refinement occurring in the fusion zone. A mathematical model has been developed to predict pitting corrosion potential of pulsed current TIG welded AA6061 aluminium *** experimental design has been used to optimize the experimental conditions. Analysis of variance technique has been used to find out the significant pulsed current parameters. Regression analysis has been used to develop the model. Using the developed model pitting corrosion potential values have been estimated for different combinations of pulsed current parameters and the results are analyzed in detail.

关键词： Pulsed current Tungsten inert gas welding Medium strength aluminium alloy Pitting corrosion Design of experiments Analysis of variance

Antioxidant activities of Indigofera cassioides *** various in vitro assay models

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Asian Pacific Journal of Tropical Biomedicine 2012年第4期2卷 256-261页

作者： R senthil kumar B Rajkapoor P Perumal Natural Products Laboratory Swamy Vivekanandha College of Pharmacy Department of Pharmacology Dayanandha Sagar College of Pharmacy Department of Pharmaceutical Chemistry JKK Nataraja College of Pharmacy

Objective:To evaluate the antioxidant potential of methanolic leaf extract of Indigofera cassioides(MEIC) using various in vilro antioxidant assay ***:Antioxidant and free radical scavenging activity of MEIC was assayed by using different in vitro models like ABTS, DPPH,nitric oxide,superoxide,hydrogen peroxide and hydroxyl *** ability of the extract was tested by the complex formation with potassium *** total phenol and flavonoid contents of the crude extract were also *** and ascorbic acid were used as ***:MEIC exhibited potent and concentration dependent free radical scavenging activity in all the tested *** ability was also found to increase with increase in MEIC *** phenol and flavonoid content determination showed that the extract is rich in phenols and ***:All the results of the in vitro antioxidant assays reveal potent antioxidant and free radical scavenging activity of the leaves of Indigofera cassioides,equivalent to that of standard ascorbic acid and *** potent antioxidant activity may be attributed to its high phenolic and flavonoid contents.

关键词： Indigofera cassioides Antioxidant Free radicals Oxidative stress Total reducing power Free radical scavenging activity

Data augmentation and machine learning techniques for control strategy development in bio-polymerization process

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Environmental Science and Ecotechnology 2022年第3期11卷 40-48页

作者： Sizhou Wei Zhiyuan Chen senthil kumar Arumugasamy Irene Mei Leng Chew School of Computer Science University of NottinghamNottinghamNG81BBUnited Kingdom School of Computer Science University of Nottingham MalaysiaSemenyih43500Malaysia Department of Chemical and Environmental Engineering University of Nottingham MalaysiaSemenyih43500Malaysia School of Engineering Monash University MalaysiaSubang Jaya47500Malaysia

Machine learning has been increasingly used in ***,in organic chemistry and other experiment-based fields,data collected from real experiments are inadequate and the current coronavirus disease(COVID-19)pandemic has made the situation even *** limited data resources may result in the low performance of modeling and affect the proper development of a control *** paper proposes a feasible machine learning solution to the problem of small sample size in the biopolymerization *** avoid overfitting,the variational auto-encoder and generative adversarial network algorithms are used for data *** random forest and artificial neural network algorithms are implemented in the modeling *** results prove that data augmentation techniques effectively improve the performance of the regression *** machine learning models were compared and the experimental results show that the random forest model with data augmentation by the generative adversarial network technique achieved the best performance in predicting the molecular weight on the training set(with an R^(2) of 0.94)and on the test set(with an R^(2) of 0.74),and the coefficient of determination of this model was 0.74.

关键词： Bio-polymerization Variational autoencoder generative adversarial network Random forest Artificial neural network