Development of Self-lubricating Nickel Based Composite Clad using Microwave Heating in Improving Resistance to Wear at Elevated Temperatures

G. Suresh,M. R. Ramesh,M. S. Srinath 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8

This paper reports on a study of the high-temperature tribological performance of self-lubricating nickel-based compositeclad. A porous and crack free clad containing matrix, reinforcement, and lubricant phase is developed on titanium 31 alloyusing microwave irradiation. The microstructure of both NiCrSiB/WC and NiCrSiB/WC/Ag/BaF2 clad revealed very goodmetallurgical bonding with the substrate. The average microhardness of NiCrSiB/WC and NiCrSiB/WC/Ag/BaF2 clad is710.58 HV and 650.25 HV respectively, is comparatively higher than the titanium 31 substrate (320 HV). The addition of Agand BaF2solid lubricants in the clad endowing clad to operate at a broad temperature range. Compared with the NiCrSiB/WCclad, solid lubricant encapsulate clad has shown very low friction coefficient and wear rates. The sliding wear characteristicsof the clad were investigated by varying load and temperatures. The results revealed that oxide phases (NiO and Cr3O)andlubricant phases (Ag and BaWO4)formed at low and high temperatures are adequate to reduce delamination and material loss.

The Importance of Ubiquitination and Deubiquitination in Cellular Reprogramming

Suresh, Bharathi,Lee, Junwon,Kim, Kye-Seong,Ramakrishna, Suresh Hindawi Publishing Corporation 2016 Stem cells international Vol.2016 No.-

<P>Ubiquitination of core stem cell transcription factors can directly affect stem cell maintenance and differentiation. Ubiquitination and deubiquitination must occur in a timely and well-coordinated manner to regulate the protein turnover of several stemness related proteins, resulting in optimal embryonic stem cell maintenance and differentiation. There are two switches: an E3 ubiquitin ligase enzyme that tags ubiquitin molecules to the target proteins for proteolysis and a second enzyme, the deubiquitinating enzyme (DUBs), that performs the opposite action, thereby preventing proteolysis. In order to maintain stemness and to allow for efficient differentiation, both ubiquitination and deubiquitination molecular switches must operate properly in a balanced manner. In this review, we have summarized the importance of the ubiquitination of core stem cell transcription factors, such as Oct3/4, c-Myc, Sox2, Klf4, Nanog, and LIN28, during cellular reprogramming. Furthermore, we emphasize the role of DUBs in regulating core stem cell transcriptional factors and their function in stem cell maintenance and differentiation. We also discuss the possibility of using DUBs, along with core transcription factors, to efficiently generate induced pluripotent stem cells. Our review provides a relatively new understanding regarding the importance of ubiquitination/deubiquitination of stem cell transcription factors for efficient cellular reprogramming.</P>

Medical student’s perception to different types of set induction in anatomy lectures

Suresh Narayanan,Suresh Narayanan,Nachiket Shankar,Vimala Ananthy 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.3

Set induction refers to the process of using a thought-provoking statement, interesting fact, or an audio-visual stimulus at the beginning of lecture to gain student’s attention and give an overview about the lecture topic. In the present study, students were introduced to three types of set induction namely narratives, food-based analogies and humor-based images or activities at the beginning of anatomy lecture and their response to it is collected and analyzed. The objective of the study is to estimate the difference in a questionnaire-based perception score between the three different types of set induction; estimate sex differences in the questionnaire-based perception score. Students rated the validated, 7-item perception questionnaire using a 5-point Likert scale. Students felt that food-based analogies and humor-based images were more interesting, motivated them to participate in lecture-discussion than the narrative set induction. The familiarity of set induction varied between all the three different types of set induction. There was no significant difference in the perception of different types of set induction between male and female undergraduate students. Based on the student’s feedback, it could also serve as a memory aid and ease the students learning experience. Majority of students responded positively to the use of set induction and recommended for its use in future classes.

K48- and K63-linked polyubiquitination of deubiquitinating enzyme USP44

Suresh, Bharathi,Ramakrishna, Suresh,Lee, Hey‑,Jin,Choi, Jong‑,Ho,Kim, Jin‑,Young,Ahn, Woong‑,Shick,Baek, Kwang‑,Hyun Wiley (John WileySons) 2010 Cell biology international Vol.34 No.8

PEST Motif Sequence Regulating Human NANOG for Proteasomal Degradation

Ramakrishna, Suresh,Suresh, Bharathi,Lim, Key-Hwan,Cha, Byung-Hyun,Lee, Soo-Hong,Kim, Kwang-Soo,Baek, Kwang-Hyun Mary Ann Liebert 2011 STEM CELLS AND DEVELOPMENT Vol.20 No.9

The role of deubiquitinating enzymes in apoptosis

Ramakrishna, Suresh,Suresh, Bharathi,Baek, Kwang-Hyun Springer-Verlag 2011 Cellular and molecular life sciences Vol.68 No.1

Investigation and parametric optimization with 97Mg+ 1.5Ag+1.5 LiAlO2 metal matrix composite in wire EDM performance using DFA technique

T. Suresh,P. Suresh,M. Prabu 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2

In several research studies, many experiments have been conducted on non-traditional Electric Discharge Machining (EDM)and also investigated how different EDM process parameters influence the surface quality and productivity. EDM is a materialremoval process in which desired shape can be obtained by generation of spark. EDM process parameters play the vital role toimprove the surface finish and productivity simultaneously. This paper presents the effects of EDM machining parameter suchas Discharge ON Time, Discharge OFF Time, and Wire Feed, and their interactions on the Material Removal Rate (MRR) andSurface Roughness (SR) during the machining of magnesium matrix composites (MgZE41A) reinforced with Ag and LiAlO2. The hybrid composite of 97Mg+1.5Ag+1.5 LiAlO2 combination is selected for manufacture using powder metallurgy techniqueas it has a high wear resistance. Analysis of Variance (ANOVA) is adopted to study the influencing process parameters for eachresponse. Desirability function analysis (DFA) tool is adopted to find the optimal EDM process parameters which would reducethe surface roughness and improve the material removal rate simultaneously. From the analysis results it has been found thatdesirability ‘D’ of 0.55 gives the better results.

Green synthesis and characterization of hexagonal shaped MgO nanoparticles using insulin plant (<i>Costus pictus</i> D. Don) leave extract and its antimicrobial as well as anticancer activity

Suresh, Joghee,Pradheesh, Ganeshan,Alexramani, Vincent,Sundrarajan, Mahalingam,Hong, Sun Ig Elsevier 2018 Advanced powder technology Vol.29 No.7

<P><B>Abstract</B></P> <P>Green synthesis is an ecofriendly novel technology and attractive research area for the production of metal oxide nanoparticles in bio-medical and chemical applications. The green perspective includes solvents, reductants or stabilizing agents obtained from a natural resource as they are non-toxic and ecofriendly. In this study, a sustainable green synthetic strategy to synthesize magnesium oxide nanoparticles by employing <I>Costus pictus</I> D. Don plant leaf extract as a reducing agent. The successful formation of magnesium oxide nanoparticles was confirmed by comprehensive characterization techniques. The presence of biomolecules and metal oxides were confirmed by Fourier transform Infrared (FT-IR) spectral data analysis. The X-ray diffraction (XRD) revealed the formation of pure cubic MgO crystalline nanoparticles. The surface morphology of MgO particles observed by Scanning electron microscope (SEM) showed the hexagonal-shaped MgO crystallites. The average size of biosynthesized MgO nanoparticles was measured to be around 50 nm by Transmission Electron Microscopy (TEM). The mechanism for the formation of MgO nanoparticles was suggested in this study. The biosynthesized magnesium oxide particles showed good antimicrobial and exhibited maximum inhibition rate for MgO nanoparticles at 200 µg showing efficient anticancer activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Green chemical approach was used to synthesize hexagonal shaped MgO nanoparticles. </LI> <LI> Aglycone steroid biomolecules play an important role in formation of nanoparticles. </LI> <LI> Hexagonal MgO nanoparticles was confirmed by FTIR, XRD, SEM and TEM analysis. </LI> <LI> Biosynthesized MgO exhibited significant antimicrobial and anticancer activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic diagram of MgO nanoparticles using <I>costus pictus</I> leaf extract.</P> <P>[DISPLAY OMISSION]</P>

Scheduling Second-Order Computational Load in Master-Slave Paradigm

Suresh, S.,Cui Run,Hyoung Joong Kim,Robertazzi, T. G.,Young-Il Kim IEEE 2012 IEEE transactions on aerospace and electronic syst Vol.48 No.1

<P>Scheduling divisible loads with the nonlinear computational complexity is a challenging task as the recursive equations are nonlinear and it is difficult to find closed-form expression for processing time and load fractions. In this study we attempt to address a divisible load scheduling problem for computational loads having second-order computational complexity in a master-slave paradigm with nonblocking mode of communication. First, we develop algebraic means of determining the optimal size of load fractions assigned to the processors in the network using a mild assumption on communication-to-computation speed ratio. We use numerical simulation to verify the closeness of the proposed solution. Like in earlier works which consider processing loads with first-order computational complexity, we study the conditions for optimal sequence and arrangements using the closed-form expression for optimal processing time. Our finding reveals that the condition for optimal sequence and arrangements for second-order computational loads are the same as that of linear computational loads. This scheduling algorithm can be used for aerospace applications such as Hough transform for image processing and pattern recognition using hidden Markov model (HMM).</P>

Improved volatile fatty acid and biomethane production from lipid removed microalgal residue (LRμAR) through pretreatment

Suresh, A.,Seo, C.,Chang, H.N.,Kim, Y.C. Elsevier Applied Science 2013 Bioresource technology Vol.149 No.-

Renewable energy from lipid removed microalgal residues (LRμARs) serves as a promising tool for sustainable development of the microalgal biodiesel industry. Hence, in this study, LRμAR from Ettlia sp. was characterized for its physico-biochemical parameters, and applied to various pretreatment to increase the biodegradability and used in batch experiments for the production of volatile fatty acids (VFA) and biomethane. After various pretreatments, the soluble organic matters were increased at a maximum of 82% in total organic matters in alkali-autoclaved sample. In addition, VFA and methane production was enhanced by 30% and 40% in alkali-sonicated and alkali-autoclaved samples, respectively. Methane heating value was recovered at maximum of 6.6MJkg<SUP>-1</SUP>VS in alkali-autoclaved conditions with comparison to non-pretreated samples. The pretreatment remarkably improved LRμAR solubilization and enhanced VFA and biomethane production, which holds immense potential to eventually reduce the cost of algal biodiesel.