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Sathiyamoorthi, Praveen,Moon, Jongun,Bae, Jae Wung,Asghari-Rad, Peyman,Kim, Hyoung Seop Elsevier 2019 Scripta materialia Vol.163 No.-
<P><B>Abstract</B></P> <P>Ultrafine-grained materials with nanotwins are expected to produce a remarkable combination of strength and ductility. In the present study, ultrafine-grained CoCrNi medium-entropy alloy with nanotwins is fabricated by high-pressure torsion followed by annealing; and investigated for cryogenic tensile properties. The alloy exhibits superior cryogenic tensile properties with a tensile strength of ~2 GPa and tensile strain of ~27%. The cryogenic tensile strength of ultrafine-grained sample increased by 67% as compared to the cryogenic tensile strength of coarse-grained sample due to fine grain size, annealing nanotwins, residual dislocation density, and strong temperature dependence of yield strength.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fine tuning of tensile properties in CrCoNi medium entropy alloy through cold rolling and annealing
Sathiyamoorthi, Praveen,Asghari-Rad, Peyman,Bae, Jae Wung,Kim, Hyoung Seop Elsevier 2019 Intermetallics Vol.113 No.-
<P><B>Abstract</B></P> <P>In the present study, tensile properties of CrCoNi medium entropy alloy with different microstructures (recovery, partial recrystallization, recrystallization) were investigated by subjecting cold-rolled samples to different annealing conditions. The microstructure of the cold-rolled sample showed the presence of severely deformed grains with several deformation twins. Annealing of the cold-rolled samples at 700 °C and above for 60 min led to fully recrystallized microstructure, while annealing at temperatures lower than 700 °C led to recovery and partially recrystallized microstructures. The annealed samples showed a typical strength-ductility trade-off with an increasing fraction of recrystallized grains and increasing average grain size in samples with partially recrystallized and fully recrystallized microstructure, respectively. Fine tuning of microstructure led to a remarkable combination of strength (~1 GPa) and uniform elongation (28%) in the sample with partially recrystallized microstructure, which consists of ~77% of recrystallized grains with an average recrystallized grain size of ~3 μm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fine tuning of microstructure through cold rolling and annealing. </LI> <LI> A reasonable ductility requires minimum of 55% of recrystallized grains. </LI> <LI> Optimal tensile properties achieved in sample with 77% recrystallized grains. </LI> <LI> Combination of strengthening from back stress and Hall-Petch effect. </LI> </UL> </P>
Sathiyamoorthy, Subramaniyam,In, Jun-Gyo,Lee, Byum-Soo,Kwon, Woo-Seang,Yang, Dong-Uk,Kim, Ju-Han,Yang, Deok-Chun The Korean Society of Ginseng 2011 Journal of Ginseng Research Vol.35 No.1
Panax ginseng root has been used as a major source of ginsenoside throughout the history of oriental medicine. In recent years, scientists have found that all of its biomass, including embryogenic calli and flower buds can contain similar active ingredients with pharmacological functions. In this study, transcriptome analyses were used to identify different gene expressions from embryogenic calli and fl ower buds. In total, 6,226 expressed sequence tags (ESTs) were obtained from cDNA libraries of P. ginseng. Insilico analysis was conducted to annotate the putative sequences using gene ontology functional analysis, Kyoto Encyclopedia of Genes and Genomes orthology biochemical analysis, and interproscan protein functional domain analysis. From the obtained results, genes responsible for growth, pathogenicity, pigments, ginsenoside pathway, and development were discussed. Almost 83.3% of the EST sequence was annotated using one-dimensional insilico analysis.
Carbon-based Materials for Atomic Energy Reactor
Sathiyamoorthy, D.,Sur, A.K. Korean Carbon Society 2003 Carbon Letters Vol.4 No.1
Carbon and carbon-based materials are used in nuclear reactors and there has recently been growing interest to develop graphite and carbon based materials for high temperature nuclear and fusion reactors. Efforts are underway to develop high density carbon materials as well as amorphous isotropic carbon for the application in thermal reactors. There has been research on coated nuclear fuel for high temperature reactor and research and development on coated fuels are now focused on fuel particles with high endurance during normal lifetime of the reactor. Since graphite as a moderator as well as structural material in high temperature reactors is one of the most favored choices, it is now felt to develop high density isotropic graphite with suitable coating for safe application of carbon based materials even in oxidizing or water vapor environment. Carboncarbon composite materials compared to conventional graphite materials are now being looked into as the promising materials for the fusion reactor due their ability to have high thermal conductivity and high thermal shock resistance. This paper deals with the application of carbon materials on various nuclear reactors related issues and addresses the current need for focused research on novel carbon materials for future new generation nuclear reactors.
Analysis of chigger mite genome and its application
Sathiyamoorthy Subramaniyam,Kesavan Markkandan,Myunghee Jung,Seungil Yoo,Junhyung Park,JongYul Roh,E-hyun Shin,Mi-Yeoun Park,Young Ran Ju,Ju Hyeon Kim,Deok Ho Kwon,Kyungjae A. Yoo,Si Hyeock Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
Leptotrombidium pallidum is the major vector mites for Orientia tsutsugamushi, the causative agent of scrub typhus. To understand the molecular mechanism of L. pallidum, we sequenced the whole genome using Illumina sequencing technology. Totally four genomic libraries with different insert sizes ranging from 280 bp to 8 kb were used to generate 45.1 Gb of genome in the combination of paired-end and mate-pairs sequencing reads. Quality filtering and correction of paired-end reads for very small and/or bad-quality sequences yielded 26.9 Gb of high-quality sequences, which are used to estimate the genome size as 175 Mbusing kmer methods and assembled into a 193.7 Mb genomic sequence scaffolds with N50 length of 92,945 bp. Furthermore, 94% of CEGMA completeness score were obtained from genome scaffold assembly. To facilitate gene annotation, we used a combination of de novo and homology based tools to predict gene models in the chigger mite genome. A combination of evidence-based and de novo approaches predicted 15,842 high-confidence protein-coding genes with an average transcript length of 1,511 bp and 2.4 exons per gene which corresponds to about 12.4% total gene length. Bacterial endosymbiosis are very common in mite species and can range from mutualistic to pathogenic associations. Henceforth, the endosymbionts in L. pallidum were predicted using the NCBI microbial draft genomes and mitochondrial genome. Besides, this L. pallidum draft genome can be used as a significant reference for comparative genomic studies across mite species.