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An attempt to improve the poor performance characteristics of coconut oil for industrial lubricants
Suresh Babu Valeru,Y. Srinivas,K. N. S. Suman 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
Coconut oil is used as the base fluid for metal cutting applications because of its high natural properties compared to other vegetable oils. The major hindrances to extensive utilization of coconut oil compared to mineral oils for various metal cutting operations are its high pour point, low oxidation and thermal stability therefore further improvement in these aspects is much needed. In this work, a systematic approach to improve the cold flow behavior, oxidation and thermal stability of the coconut oil by the combination of chemical additive i.e 2,6 Di-tetra butyl phenol and diluents such as Poly alpha olefin4(PAO4), Poly (Ethylene co-vinyl acetate) (PPD) has been carried out. Based on the obtained results an improvement of cold flow behavior (least pour point) was observed with the addition of PAO4 and PPD with varying weight percentage combinations. Apart from this addition of 2, 6 Di-tetra butyl phenol as anti-oxidant (AO) in various weight percentage has led to an improvement of oxidation and thermal stability to the primarily modified coconut oil.
Adaptive Firefly Algorithm based OPF for AC/DC Systems
Babu, B. Suresh,Palaniswami, S. The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.4
Optimal Power Flow (OPF) is an important operational and planning problem in minimizing the chosen objective functions of the power systems. The recent developments in power electronics have enabled introduction of dc links in the AC power systems with a view of making the operation more flexible, secure and economical. This paper formulates a new OPF to embrace dc link equations and presents a heuristic optimization technique, inspired by the behavior of fireflies, for solving the problem. The solution process involves AC/DC power flow and uses a self adaptive technique so as to avoid landing at the suboptimal solutions. It presents simulation results of IEEE test systems with a view of demonstrating its effectiveness.
Suresh Babu Daram,P.S.Venkataramu,M.S.Nagaraj 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.5
Flexible AC Transmission System (FACTS), under different conditions, are being incorporated in a power system for the improvement of active power flow along with voltage at each bus. Among the many FACTS devices, Interline Power Flow Controller (IPFC) is one of its kind, that has the capability of controlling multi-transmission systems. In this paper, an Improved Power Injection Model (IPIM) of Interline Power Flow Controller (IPFC) has been introduced. This model was included to Newton-Raphson (NR) method of load flow solution. The proposed model is tested on the standard test systems. The results of standard 5-bus system, IEEE-14 bus system is presented for the purpose of demonstration.
Capillary electrophoresis at the omics level: Towards systems biology
Babu C. V., Suresh,Song, Eun Joo,Babar, Sheikh Md. Enayetul,Wi, Mun Hyung,Yoo, Young Sook WILEY-VCH Verlag 2006 Electrophoresis Vol.27 No.1
<P>Emerging systems biology aims at integrating the enormous amount of existing omics data in order to better understand their functional relationships at a whole systems level. These huge datasets can be obtained through advances in high-throughput, sensitive, precise, and accurate analytical instrumentation and technological innovation. Separation sciences play an important role in revealing biological processes at various omic levels. From the perspective of systems biology, CE is a strong candidate for high-throughput, sensitive data generation which is capable of tackling the challenges in acquiring qualitative and quantitative knowledge through a system-level study. This review focuses on the applicability of CE to systems-based analytical data at the genomic, transcriptomic, proteomic, and metabolomic levels.</P>
Suresh Babu B,Chandramohan G,Boopathi C,Pridhar T,Srinivasan R 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.1
The present study elucidates the influence of reinforcement particles in friction stir welded aluminium (Al 6063) matrixcomposites on mechanical properties of the metal matrix composition. Initially composites were successfully fabricated withdifferent weight percentage and combination of reinforcements (graphite (gr), B4C and SiC) through stir casting technique. All sets of composite specimen were welded through solid state joining process of friction stir welding technique, theparameters such as tool rotational speed (800, 1000 and 1200 rpm), welding speed (20 and 40 mm/min) and axial loading (10and 20 kN) are taken for characterization of fabricated composites. The effects of friction stir welding parameters wereexamined by mechanical and microstructural characterizations. The composites microstructure and dispersion of particlereinforcements were analysed through optical microscope and also the mechanical properties of yield strength, ultimatestrength and elongation were analysed using universal testing machine. The optimized friction stir weld parameters wereidentified for 20% weight fraction reinforced hybrid composites.
Kinetic Analysis of the MAPK and PI3K/Akt Signaling Pathways
Suresh Babu, CV,Babar, Sheikh Md. Enayetul,Song, Eun Joo,Oh, Eulsik,Yoo, Young Sook Korean Society for Molecular Biology 2008 Molecules and cells Vol.25 No.3
Computational modeling of signal transduction is currently attracting much attention as it can promote the understanding of complex signal transduction mechanisms. Although several mathematical models have been used to examine signaling pathways, little attention has been given to crosstalk mechanisms. In this study, an attempt was made to develop a computational model for the pathways involving growth-factor-mediated mitogen-activated protein kinase (MAPK) and phosphatidylinositol 3'-kinase/protein kinase B (PI3K/Akt). In addition, the dynamics of the protein activities were analyzed based on a set of kinetic data. The simulation approach integrates the information on several levels and predicts systems behavior. The in-silico analysis conducted revealed that the Raf and Akt pathways act independently.
Suresh Babu, C. V.,Cho, Sung Gook,Sook Yoo, Young WILEY-VCH Verlag 2005 Electrophoresis Vol.26 No.19
<P>Signal transduction studies have indicated that Akt is essential for transducing the signals originating from extracellular stimuli. An exploration of the Akt signal transduction mechanism depends on the ability to assay its activation states by determining the ability of Akt to phosphorylate various substrates. This paper describes a CE-based kinase assay for Akt using a UV detection method. The RPRAATF peptide was used as the specific substrate to determine the Akt activity. Under the CE separation conditions used, the phosphorylated and nonphosphorylated forms of the RPRAATF peptide were rapidly resolved in the Akt reaction mixture within 20 min. Using this method for measuring the Akt activity, the incubation time for the Akt reactions as well as the kinetic parameters (K<SUB>M</SUB>) were examined. Furthermore, the developed method was applied to a PC12 cell system to assess the dynamics of the Akt activity by examining the effectiveness of the RPRAATF peptide substrate under various cytokine-stimulated environments. These results highlight the feasibility of the CE method, which is a simple and reliable technique for determining and characterizing various enzyme reactions particularly kinase enzymes.</P>
A Synchrophasor-Based Line Protection for Single Phase-Ground Faults
Babu N. V. Phanendra,Babu P. Suresh,Roy Saptarshi,Babu T. Sudhakar,Bharadwaj Anil 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
Synchrophasor measurement data enhances the transmission line protection. This paper proposes an improved line protection against single phase-ground faults using synchronized phasor data. This algorithm prevents the relay mal-operation caused by high fault resistance. This algorithm calculates the phase difference between relay point voltage and fault point voltage based on the relation between negative sequence of relay point current and fault point current. After, the calculated phase difference between relay point voltage and fault point voltage will be compared with set point voltage phase referred from the relay point voltage phase. The fault detection action will be taken according to a certain phase difference relation between fault point voltage and set point voltage. This method is then applied to a practical single machine single line system. The results show that the suggested algorithm could determine in-line faults accurately with less computational time. It also has proved that this method is immune to the fault resistance, system conditions.
Suresh Babu, R.,Pyo, Myoungho The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.6
<P>In this work, we report the facile synthesis of sugar hard carbon (SHC)/multi-walled carbon nanotube (MWNT) composites (SHC/MWNT) and comparisons of electrochemical performance with that of pristine SHC when used as anodes in sodium ion batteries (SIBs). Composites with various contents of MWNTs were prepared via the simple mechanical mixing of MWNTs with a SHC precursor, to control the nanopore density and enhance the reversible sodium insertion/desertion at low charge/discharge (C/D) voltages. The incorporation of well-dispersed MWNTs in the SHC media decreased the crystallite sizes of the SHC and increased the meso-to-macropore densities in the composites, which eventually contributed to an improvement in the reversible capacity and cyclability of the composite. At the optimal MWNT content (5%), the composite showed a reversible capacity of 300 mAh·g<SUP>−1</SUP> at 20 mA·g<SUP>−1</SUP>, in contrast to 221 mAh·g<SUP>−1</SUP> for the SHC. This trend was maintained after 50 C/D cycles, delivering a high capacity of 280 mAh·g<SUP>−1</SUP>, relative to 220 mAh·g<SUP>−1</SUP> for the SHC. The noticeable improvement for Na storage capability in the SHC/MWNT mostly resulted from an increase of nanopore density, which extended the low-voltage plateau for great reversible capacity and high capacity retention, and also contributed to an enhancement in rate capability.</P>