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Thiyagarajan, P.,Mathur, R.B.,Dhami, T.L. Korean Carbon Society 2003 Carbon Letters Vol.4 No.3
Asbestos is being replaced throughout the world among friction materials because of its carcinogenic nature. This has raised an important issue of heat dissipation in the non-asbestos brake pad materials being developed for automobiles etc. It has been found that two of the components i.e. carbon fibres as reinforcement and graphite powder as friction modifier, in the brake pad material, can playa vital role in this direction. The study reports the influence of these modifications on the thermal properties like coefficient of thermal expansion (CTE) and thermal conductivity along with the mechanical properties of nonasbestos brake pad composite samples developed in the laboratory.
Plasma-induced photoresponse in few-layer graphene
Thiyagarajan, K.,Ananth, A.,Saravanakumar, B.,Mok, Y.S.,Kim, S.J. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.73 No.-
A device consisting of a few layers of graphene (FLG) sheets was exposed to atmospheric plasma, resulting in the generation of significant number of defects, oxygen absorption, and doping. The plasma-induced electrical transformation and photoconducting properties of pristine FLG and plasma-irradiated FLG (p-FLG) were compared under visible and ultraviolet (UV) light illumination. The visible light photoresponsivity of p-FLG was 0.47AW<SUP>-1</SUP> at 535nm, comparatively higher than that observed for pristine FLG (10mAW<SUP>-1</SUP>); this result was attributed to the formation of defect midgap states band by plasma irradiation. Photoinduced molecular desorption causes the responsivity of the higher energy (UV) photons. Our results suggest that plasma irradiation is a simple, novel way to tailor the optoelectronic properties of graphene layers.
Functional analysis of a gycosyltransferase, GNUT during rice development
Thiyagarajan Thulasinathan,Rikno Harmoko,Wahyu Indra Fanata,Jae Yong Yoo,Ki Seong Ko,Nirmal Kumar Ramasamy,Kyung Hwa Kim,Ryun Gyeong Kim,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2013 한국당과학회 학술대회 Vol.2013 No.1
N-linked Glycosylation is enzymatic process that attaches sugars residue to tripeptide sequence Asparagine-X-Serine /Threonin of nascent polypeptide, where X could be any amino acid except Proline. Extracellular and endomembrane protein are mostly glycosylated by N-linked oligosaccharides in eukaryote. The maturation of N-glycan is modified by glycosidases and glycosyl transferases in the ER and golgi of the secretory pathway. The GNUT is a glycosyltransferases that responsible for the transfer core sugar residues to N-glycans of glycoprotein. To explore the physiological role of alpha GNUT, the mutant gnut1 was isolated in rice. Genetic analysis shows that T-DNA was inserted in the first intron of the GNUT gene. The T-DNA insertion causes loss-of-function mutation of this gene. Biochemical analysis have confirm that sugar residue was absent from core N-glycan in this mutant. The gnut1 shows internodes length retardation in the late vegetative growth. In generative growth, the gnut1 mutant also exhibit short panicles length, grain filling defective and small grains. The result indicates that GNUT is important for normal growth of rice in the generative phase.
Selective catalytic reduction converter design: The effect of ammonia nonuniformity at inlet
Thiyagarajan Paramadayalan,Atul Pant 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
A three-dimensional CFD model of SCR converter with detailed chemistry is developed. The model is used to study the effects of radial variation in inlet ammonia profile on SCR emission performance at different temperatures. The model shows that radial variation in inlet ammonia concentration affects the SCR performance in the operating range of 200-400 oC. In automotive SCR systems, ammonia is non-uniformly distributed due to evaporation/reaction of injected urea, and using a 1D model or a 3D model with flat ammonia profile at inlet for these conditions can result in erroneous emission prediction. The 3D SCR model is also used to study the effect of converter design parameters like inlet cone angle and monolith cell density on the SCR performance for a non-uniform ammonia concentration profile at the inlet. The performance of SCR is evaluated using DeNOx efficiency and ammonia slip.
Strategies for stretchable polymer semiconductor layers
Thiyagarajan, Kaliannan,Jeong, Unyong MRS MATERIALS RESEARCH SOCIETY 2017 MRS bulletin Vol.42 No.2
<P>Electronics are evolving from brittle to flexible and are expected to advance to stretchable. Development of stretchable semiconductor materials is a key step for the realization of highly deformable transistors. This article introduces the technological strategies for achieving stretchable polymer semiconductors, including a geometrical approach, formation of a nanofibril network, microcrack formation, and synthesis of new polymers. We conclude with perspectives on further development of stretchable polymer semiconductors.</P>