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Preliminary Investigation of Copper Joints Soldered with Sn58Bi

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Journal of Harbin Institute of Technology(New Series) 2022年第1期29卷 57-63页

作者： Amares Singh Teow Sinn Khai Rajkumar durairaj Amer Ahmed Qassem Saleh Center for Advanced Materials Research and Manufacturing Processes SEGi UniversityPetaling Jaya 47810SelangorMalaysia Lee Kong Chian Faculty of Engineering and Science University Tunku Abdul RahmanKajang 43000SelangorMalaysia

In recent years,intensive studies have been carried out to find an alternative for Tin(Sn)⁃Lead(Pb)solder alloys with increasing demand over lower temperature solder alloys in current electronic packaging *** temperature operational solder alloys seem to produce drawback to other components on the printed circuit board(PCB).Low melting temperature Sn58Bi substrate as a potential replacement was investigated in this paper based on the melting properties,wettability,and shear *** Sn58Bi was soldered at a temperature below 200℃on the Cu substrate,and the shear strength and contact angle were calculated.A peak temperature(melting temperature,T_(M))of 144.83℃was *** lap joint method was performed at a strain rate of 0.1 mm/min and an average shear strength of 23.4 MPa was found from three *** contact angle(wettability)was calculated to study the solder joint behaviour at reflow temperature of 170℃.The contact angle of the Sn58Bi was found to be 32.4°and considered to be desired value since the angle is less than 50°.The low temperature soldering provides a preliminary result to allow further application on the real PCB.

关键词： SnBi solder low temperature shear strength contact angle

Effect of process parameters on springback behaviour during air bending of electrogalvanised steel sheet

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 183-189页

作者： durairaj VASUDEVAN Rajumani SRINIVASAN Palani PADMANABHAN Department of Mechanical Engineering PSNA College of Engineering and Technology Department of Mechanical Engineering RVS College of Engineering and Technology Bharath Niketan Engineering College

This work aims to study the springback behaviour of electrogalvanised (EG) steel sheets during the air bending *** have been conducted to analyse the influence of various parameters such as coating thickness,orientation of the sheet,punch radius,die radius,die opening,punch velocity,and punch travel on springback *** is established that the springback increases with increasing coating thickness,punch radius,punch travel,die radius,die opening,and punch *** 90° orientation exhibits higher springback than 0° orientation.

关键词： Springback Electrogalvanised (EG) steel Air bending

The Influence of Portulaca Oleracea L. Leaves Extracts on the Histoarchitecture of Culex Quinquefasciatus and Anopheles Stephensi Larvae

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Clinical Complementary Medicine and Pharmacology 2022年第3期2卷 63-71页

作者： Parthasarathy Sudharsan durairaj Siva Kamaraj Prabhu Chandran Janani PG and Research Department of Biotechnology Srimad Andavan Arts and Science College(Autonomous)ThiruvanaikovilTiruchirappalli 620005Tamil NaduIndia PG and Research Department of Microbiology Srimad Andavan Arts and Science College(Autonomous).ThiruvanaikovilTiruchirappalli 620005Tamil NaduIndia

Background:Mosquito is a big threat to the human ***-borne diseases cause millions of death to the human ***,a permanent solution is eagerly to be established to control its excessive growth in stagnant *** oleracea Linn is a natural larvicidal agent,which contains active ingredients such as linolenic acid,linoleic acid(omega-3 fatty acids).These bioactive compounds may be responsible for its larvicidal properties on ***:The present study is focussed on identifying the bioactive compounds,such as linolenic acid,through GC-MS,and analyzing the larvicidal efficacy of Portulaca oleracea *** Culex quinquefasciatus and Anopheles stephensi ***:Preliminary phytochemical analysis,total protein content,total carbohydrate content,total phenol content,total flavonoid content and GC-MS analysis exhibited the presence of rich phytoconstituents in Portulaca *** analysis was carried out to analyze the antioxidant potential of plant *** activity and histological change were detected to evaluate the efficacy of Portulaca oleracea *** the Culex quinquefasciatus and Anopheles stephensi ***:Aqueous and ethanol leaf extracts of Portulaca oleracea *** both Culex quinquefasciatus and Anophe-les stephensi larvae,showed a very good larvicidal activity at 500μg/mL among the various ***-tological damages of mosquito larvae were observed when treated with the Portulaca oleracea ***,and provided further evidence for its larvicidal ***:This study concluded that the plant Portulaca oleracea *** many useful bioactive compounds,can be a strong larvicidal agent against both Culex quinquefasciatus and Anopheles stephensi *** molecular mechanism for the larvicidal activity will be identified in future studies.

关键词： Portulaca oleracea L.leaves Aqueous extract Ethanol extract Fatty acids Culex quinquefasciatus larvae Anopheles stephensi larvae

P systems generating iso-picture languages

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Progress in Natural Science:Materials International 2008年第5期18卷 617-622页

作者： Subbaiah Annadurai Thiyagarajan Kalyani Vincent Rajkumar Dare durairaj Gnanaraj Thomas Department of Mathematics St. Joseph’s College of Engineering Department of Mathematics Madras Christian College Tambaram

P systems generating rectangular arrays and hexagonal arrays have been studied in the literature, bringing together the two areas of theoretical computer science, namely membrane computing and picture languages. Recently, a new class of picture languages called the class of iso-picture languages generating interesting picture languages has been introduced. In this paper, we develop a class of tissue-like P systems with active membranes as a generative device for iso-picture languages.

关键词： P system Iso-picture Languages

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Trajectory P system

Progress in Natural Science:Materials International 2008年第5期18卷 611-616页

Membrane computing is a branch of natural computing aiming to abstract computing ideas for the structure and the functioning of living cells as well as from the way the cells are organized in tissues or higher-order structures. Trajectories are used as a tool for modeling language operations and other related objects. A trajectory P system consists of a membrane structure in which the object in each mem- brane is a collection of words and the evolutionary rules are given in terms of trajectories. In this paper, we present some properties of trajectory P systems.

关键词： Membrane computing Shu e trajectories Parallel computation

Functional expression and regulation of eukaryotic cytochrome P450 enzymes in surrogate microbial cell factories

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Engineering Microbiology 2022年第1期2卷 17-34页

作者： Pradeepraj durairaj Shengying Li State Key Laboratory of Microbial Technology Shandong UniversityQingdao 266237ShandongChina Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237ShandongChina

Cytochrome P450(CYP)enzymes play crucial roles during the evolution and diversification of ancestral monocel-lular eukaryotes into multicellular eukaryotic organisms due to their essential functionalities including catalysis of housekeeping biochemical reactions,synthesis of diverse metabolites,detoxification of xenobiotics,and con-tribution to environmental *** CYPs with versatile functionalities are undeniably regarded as promising biocatalysts with great potential for biotechnological,pharmaceutical and chemical industry ***,the modes of action and the challenges associated with these membrane-bound proteins have hampered the effective utilization of eukaryotic CYPs in a broader *** review is focused on comprehen-sive and consolidated approaches to address the core challenges in heterologous expression of membrane-bound eukaryotic CYPs in different surrogate microbial cell factories,aiming to provide key insights for better studies and applications of diverse eukaryotic CYPs in the *** also highlight the functional significance of the previously underrated cytochrome P450 reductases(CPRs)and provide a rational justification on the progression of CPR from auxiliary redox partner to function modulator in CYP catalysis.

关键词： Cytochrome P450 enzymes Cytochrome P450 reductase Membrane-bound proteins N-terminal transmembrane domain Heterologous expression Microbial cell factories Redox partners Electron transfer

Identification of miR-802-5p and its involvement in type 2 diabetes mellitus

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World Journal of Diabetes 2020年第12期11卷 567-571页

作者： Kaushik Vishnu Rajkumar Ganesh Lakshmanan durairaj Sekar Department of Anatomy Saveetha Dental College and HospitalSaveetha Institute of Medical and Technical Science(SIMATS)Saveetha UniversityChennai 600077India Dental Research Cell and Biomedical Research Unit(DRC-BRULAC) Saveetha Dental College and HospitalSaveetha Institute of Medical and Technical Science(SIMATS)Saveetha UniversityChennai 600077India

MicroRNAs(miRNA)are recently discovered endogenous,small noncoding RNAs(of 22 nucleotides)that play pivotal roles in gene *** are involved in post-transcriptional control of gene *** are emerging as important regulators of cell proliferation,development,cancer formation,stress responses,cell death and physiological *** evidence has demonstrated the human miRNAs bind to their target mRNA sequences with perfect or near-perfect sequence *** provides a powerful strategy for discovering potential type 2 diabetes mellitus(T2DM)targets and gives the probability to exploit them for diagnostic and therapeutic *** 6%of the world population is affected by T2DM,and it is recognized as a global epidemic by the World Health *** present there is no valid biomarker to control or manage ***,the present study applied a mature sequence of miRNAs from publicly accessible databases to identify the miRNA from T2DM expressed sequence tags,and the results are detailed and discussed below.

关键词： MicroRNAs Type 2 diabetes mellitus miR-802-5p Biomarker Expressed sequence tags Disease

An analysis of land use development city using imagery pattern in the industrial high resolution satellite

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Journal of Geographical Sciences 2011年第1期21卷 79-88页

作者： John Prince Soundranayagam P. Sivasubramanian N. Chandrasekar K.S.P. durairaj Centre for GeoTechnology Manonmaniam Sundaranar University Tirunelveli-627012 India Department of Geology V.O.Chidambaram College Tuticorin-628008 India The controller Manonmaniam Sundaranar University Tirunelveli-627012 India

The spatial differentiation of land use changes of Tuticorin is studied using high resolution LISS III satellite imagery and Maximum Likelihood algorithms. The classification accuracy of 95.2% was obtained. In this study,the land use of Tuticorin is classified as settlement,salt pan,agricultural land,wasteland,water bodies and shrubs. The settlement area is increased to 4.6 km2 during the year 2001 and 2006. The settlement area change is mainly driven by growth of industries and migration of people from peripheral villages. Shrub is increased to 3.63 km2 in the six year period. Water logging due to growth of shrubs in Tuticorin leads to several environmental and health hazard. This study warrants proper urban planning for Tuticorin for sustainable use of resource and environment.

关键词： land use urban planning remote sensing environment health hazard

Association of angiotensin converting enzyme gene insertion/deletion polymorphism with essential hypertension in south Indian population

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Genes & Diseases 2016年第2期3卷 159-163页

作者： Ramalingam Krishnan durairaj Sekar Santha karunanithy Sethupathy Subramanium Narayana Medical College and Hospital Nellore605005India Rajamuthaiya Medical College Annamalai UniversityChidhambaram605003India

Genetic,environmental and demographic factors contribute to the development of essential *** polymorphism of Rennin-angiotensin-aldosterone system(RAAS)has been extensively studied to determine the genetic susceptibility to *** insertion/deletion(I/D)angiotensin converting enzyme(ACE)polymorphism has been established as a cardiovascular risk factor in some population,but its association with essential hypertension is *** study sought to determine the association of I/D polymorphism of the ACE gene in south Indian essential hypertensive subjects.A total of 208 clinically diagnosed essential hypertensive patients without any associated diseases and 220 healthy control subjects were included in this *** and allelic frequency of Insertion(I)and Deletion(D)polymorphism at the 287 base pair Alu repeat sequence in the intron 16 of ACE gene were *** distribution of II,ID,DD genotypes of ACE gene was 28.3%,32.6%and 38.9%respectively in essential hypertensive patients and to 53.6%,26.3%and 20%in *** allele frequency for D allele is 0.58 in essential hypertension as compared to 0.34 of control *** genotype and allele frequency of ACE gene polymorphism is significantly differed in patients when compared to *** conclusion,the I/D polymorphism of ACE gene is associated with Indian essential hypertension.

关键词： Angiotensin converting enzyme Essential hypertension Insertion/deletion polymorphism Renin angiotensin aldosterone system Genotypes