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- 저자 : V Senthil (검색결과 342 건)
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Senthil kumar Raman,Heuy Dong Kim 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The unique characteristics of supercritical carbon dioxide (SCO₂) are reason enough to find its use in various engineering applications. But still usability of SCO₂ is not completely explored due to lack of knowledge about its real gas effects. The present study mainly addresses the real gas effects on supercritical CO₂ flow through a supersonic convergent-divergent nozzle. With series of theoretical equations which are based on one-dimensional gas dynamics theory, computer program has been developed to predict the compressible flow characteristics of supercritical CO₂. With the data obtained from the computer program, properties of supercritical CO₂ near critical point is theoretically analyzed with different EOS. Computational analysis also has been carried out to reasonably predict the SCO₂ flows. The deviation in prediction of properties of SCO₂ by a EOS from other one is addressed. Several types of the equations of state were applied to the compressible Navier-Stokes equations. For effective use of available EOS, an attempt is made by coupling ideal gas EOS and real gas EOS to analyze the real gas effect of SCO₂. These results are compared with the computational results of SCO₂ flow through convergent divergent nozzle with a single real gas EOS. The obtained solutions were used to investigate the generic features of supercritical CO₂ flow, in terms of shock wave location, flow choking, total pressure loss, pressure recovery, etc.
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A Simple Method for Solving Type-2 and Type-4 Fuzzy Transportation Problems
Senthil Kumar, P. Korean Institute of Intelligent Systems 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.4
In conventional transportation problem (TP), all the parameters are always certain. But, many of the real life situations in industry or organization, the parameters (supply, demand and cost) of the TP are not precise which are imprecise in nature in different factors like the market condition, variations in rates of diesel, traffic jams, weather in hilly areas, capacity of men and machine, long power cut, labourer's over time work, unexpected failures in machine, seasonal changes and many more. To counter these problems, depending on the nature of the parameters, the TP is classified into two categories namely type-2 and type-4 fuzzy transportation problems (FTPs) under uncertain environment and formulates the problem and utilizes the trapezoidal fuzzy number (TrFN) to solve the TP. The existing ranking procedure of Liou and Wang (1992) is used to transform the type-2 and type-4 FTPs into a crisp one so that the conventional method may be applied to solve the TP. Moreover, the solution procedure differs from TP to type-2 and type-4 FTPs in allocation step only. Therefore a simple and efficient method denoted by PSK (P. Senthil Kumar) method is proposed to obtain an optimal solution in terms of TrFNs. From this fuzzy solution, the decision maker (DM) can decide the level of acceptance for the transportation cost or profit. Thus, the major applications of fuzzy set theory are widely used in areas such as inventory control, communication network, aggregate planning, employment scheduling, and personnel assignment and so on.
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A Simple Method for Solving Type-2 and Type-4 Fuzzy Transportation Problems
P. Senthil Kumar 한국지능시스템학회 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.4
In conventional transportation problem (TP), all the parameters are always certain. But, many of the real life situations in industry or organization, the parameters (supply, demand and cost) of the TP are not precise which are imprecise in nature in different factors like the market condition, variations in rates of diesel, traffic jams, weather in hilly areas, capacity of men and machine, long power cut, labourer’s over time work, unexpected failures in machine, seasonal changes and many more. To counter these problems, depending on the nature of the parameters, the TP is classified into two categories namely type-2 and type-4 fuzzy transportation problems (FTPs) under uncertain environment and formulates the problem and utilizes the trapezoidal fuzzy number (TrFN) to solve the TP. The existing ranking procedure of Liou and Wang (1992) is used to transform the type-2 and type-4 FTPs into a crisp one so that the conventional method may be applied to solve the TP. Moreover, the solution procedure differs from TP to type-2 and type-4 FTPs in allocation step only. Therefore a simple and efficient method denoted by PSK (P. Senthil Kumar) method is proposed to obtain an optimal solution in terms of TrFNs. From this fuzzy solution, the decision maker (DM) can decide the level of acceptance for the transportation cost or profit. Thus, the major applications of fuzzy set theory are widely used in areas such as inventory control, communication network, aggregate planning, employment scheduling, and personnel assignment and so on.
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Senthil-Nathan, Sengottayan,Kalaivani, Kandaswamy,Choi, Man-Young,Paik, Chae-Hoon Elsevier 2009 Pesticide biochemistry and physiology Vol.95 No.2
<P><B>Abstract</B></P><P>It has been established that jasmonate and its pure derivative, Jasmonic Acid can induce the emission of volatiles similar to those induced by herbivory which fed on the plant. Although the effects of induced resistance on chewing insects have been extensively studied, relatively little is known about their potential effects on phloem-feeding insects such as brown planthoppers. We studied the pattern of within-plant preference in the brown planthopper, <I>Nilaparvata lugens</I> (Stål) (BPH) (Homoptera: Delphacidae) and its consequences for offspring performance on the host-plant <I>Oryza sativa</I> L. (Taebaegbyeo variety) regarding the role of induced resistance of rice plants to hopper feeding. The present study examined the effects of induced resistance on the feeding (food assimilation and digestion), development, egg hatchability and survival. In this study, induced resistance was activated in rice using a foliar application of synthetic jasmonic acid (JA) (low 2.5mM and high 5mM). Induced resistance significantly reduced the longevity and egg hatchability of the adult <I>N. lugens</I>, as well as the percentage of nymphs surviving to maturity (only at high dose). This study also observed <I>N. lugens</I> food utilization, in order to evaluate the potential influence of induced resistance on <I>N. lugens</I> feeding behavior. The quantity of food ingested and assimilated by <I>N. lugens</I> on JA treated rice plants was significantly affected at the high dose of JA. These results indicate that JA application induces systemic defenses in rice that have a direct negative impact on <I>N. lugens</I> survivorship. At high concentration (5mM) several abnormalities possibly related to defective moulting, were observed along with malformed eggs. These findings expand our knowledge the effects of JA-dependent defenses on phloem-feeding insects.</P>
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Senthil Kumar, M,Park, J Y,Lee, Y S,Chung, S J,Hong, C-H,Suh, E-K Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.17
<P>Surface morphology of green InGaN/GaN multi-quantum wells (MQWs) on a sapphire substrate with various high temperature grown GaN barriers has been evaluated. Keeping the InGaN well growth temperature constant at 740 °C, a series of MQWs were grown with GaN barrier temperatures varied up to 910 °C. GaN barriers grown below 800 °C lead to the generation of a high density of V-defects and inclusions embedded within V-defects as observed by atomic force microscopy. Scanning electron microscopy and cathodoluminescence (CL) studies revealed that the embedded inclusions are of two kinds: one of them appears as bright spots in CL mapping while the other appears as the surrounding region. Temperature ramping and subsequent interruption for GaN barrier growth suppresses both kinds of inclusion defects and also significantly reduces the V-defect density. An inclusion-free smooth surface is obtained for green emitting InGaN/GaN MQWs with the GaN barrier grown at 910 °C.</P>
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Senthil, Chenrayan,Amutha, Subramani,Gnanamuthu, Ramasamy,Vediappan, Kumaran,Lee, Chang Woo Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.491 No.-
<P><B>Abstract</B></P> <P>The rational design and development of robust anode materials are important to realize high-performance sodium-ion batteries (SIBs). Herein, intrinsically conductive MoS<SUB>2</SUB> supported nitrogen-doped carbon superstructures (MoS<SUB>2</SUB>/NC) are reported as a highly active and conductive Na-ion battery anode. The <I>in-situ</I> formation of nitrogen-doped carbon matrices during hydrothermal treatment significantly favours the formation and coexistence of the 2H (semiconducting) and 1T (metallic) phases of MoS<SUB>2</SUB> due to the confinement effect of nitrogen and carbon. In addition, the restacking and intrinsic conductivity of MoS<SUB>2</SUB> nanosheets are diminished through the generation of layered carbon structures. As an anode material for Na-ion battery, the as-prepared MoS<SUB>2</SUB>/NC material exhibited improved Na-ion storage with a reversible capacity of 394 mAh g<SUP>−1</SUP> at a current rate of 0.1 C, and a good rate capability. The improved electrochemical performances of the MoS<SUB>2</SUB>/NC superstructures might be due to the coexistence of the 2H and 1T phases of MoS<SUB>2</SUB>. The layers of carbon in these structures act as spacers to prevent the agglomeration of MoS<SUB>2</SUB> sheets, thus enhancing the conductivity by mitigating volume changes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile, efficient, and surfactant-less synthesis for 1T MoS<SUB>2</SUB> is reported. </LI> <LI> Advantages of <I>in-situ</I> N-doping and N-rich carbon sheets are achieved in a single step. </LI> <LI> 1T MoS<SUB>2</SUB>/N-rich carbon electrode delivers enhanced capacity of 394 mAh g<SUP>−1</SUP>. </LI> <LI> Presence of C and N offers improved electronic and ionic conductivity. </LI> <LI> Carbon sheets prevent particle agglomeration and alleviate volume changes. </LI> </UL> </P>
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Experimental investigation of palm kernel fibre reinforced epoxy based composite
Senthil Kumar KM,Thirumalai Ramanathan,Seenivasan Murugesan,Venugopal Thangamuthu 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The composite specimen consisting of eight layers of palm kernel and coir fibers with different weight proportions wereprepared through hand lay-up technique. The experimental investigation of delamination factor, surface roughness, machiningforce and tool life are carried out in this work. The hand layup technique was used for the processing of the compositematerial, which constitutes the epoxy resin as the matrix material and fibre as the reinforcing material. Also silicon carbidewas added to the composite material in several percentages to increase the strength of the composite material. The specimenwas tested according to the testing standards and the values of surface roughness, delamination factor, machining force andtool life were recorded. ANOVA and Taguchi analysis for all responses were carried out and discussed here.
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