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Bukke, Ravindra Naik,Avis, Christophe,Naik, Mude Narendra,Jang, Jin IEEE 2018 IEEE electron device letters Vol.39 No.3
<P>We report the effect of purification of ZrO<SUB>x</SUB> precursor on the performance of solution processed amorphous indium–zinc–tin oxide thin-film transistors with a ZrO<SUB>x</SUB> gate insulator, which is processed at the maximum temperature of 300 °C in air. By purification, the saturation mobility ( <TEX>$\mu _{\textit {sat}}$</TEX>) increases from 2.45 ± 0.83 to 15.42 ± 4.01 cm<SUP>2</SUP>V<SUP>−1</SUP>s<SUP>−1</SUP>, subthreshold swing decreases from 141.44 ± 14.08 to 87.90 ± 11.05 mV/decade and drain current ON/OFF ratio increases from ~10<SUP>7</SUP> to ~10<SUP>9</SUP>. The leakage currents are remarkably reduced by using purified ZrO<SUB>x</SUB> as a gate insulator. The improvement is mainly due to the reduced impurities and less oxygen vacancies in ZrO<SUB>x</SUB>.</P>
Naik, M.u.d.,Rather, S.u.,So, C.S.,Hwang, S.W.,Kim, A.R.,Nahm, K.S. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.21
Thermogravimetric analysis of LiAlH<SUB>4</SUB> chemically mixed with different additives is reported for the application of hydrogen storage. Here, we illustrated the dehydrogenation properties of combined LiAlH<SUB>4</SUB>/LiNH<SUB>2</SUB> (2:1) mixture and LiAlH<SUB>4</SUB> wet-doped with different transition metals (Sc, Ti, and V) in their chloride forms. Thermal gravimetric analysis of LiAlH<SUB>4</SUB>/LiNH<SUB>2</SUB> system released ∼7.9wt.% of hydrogen in three decomposition steps at temperatures between 75 and 280<SUP>o</SUP>C under a heating ramp of 5<SUP>o</SUP>Cmin<SUP>-1</SUP>. The LiAlH<SUB>4</SUB> doped with transition metals showed the decrease of decomposition temperature down to 30-40<SUP>o</SUP>C for both 1st and 2nd dehydrogenation steps as compared to as-received LiAlH<SUB>4</SUB>. The catalytic activity in lowering the dehydrogenation temperature of LiAlH<SUB>4</SUB> doped with transition metals increases in the order of pure LiAlH<SUB>4</SUB><V<Ti<Sc. The X-ray diffraction analysis, field emission scanning electron microscopy, and Fourier transformation infra-red spectroscopy techniques were carried out in support of the thermogravimetric results.
An Investigation of the Learning Styles of South Korean Business Students
Naik, Bijayananda,Girish, V.G. KNU The Institute of Management Economy Research 2012 Asia-Pacific Journal of Business Vol.3 No.1
The Index of Learning Styles (ILS) instrument based on the Felder-Silverman Learning Style Model was used to determine distribution of learning styles of 125 South Korean business students enrolled in a South Korean institution of higher education. Results show that greater proportion of South Korean business students surveyed in this study prefer sensing over intuitive, visual over verbal, reflective over active, and global over sequential learning styles. The majority of business students have a balanced learning style in all four dimensions of the Felder-Silverman model. Among the students that do not have a balanced learning style, students with sensing, visual, reflective, and global learning styles dominate. Gender difference in learning style preference was not statistically significant for any of the four dimensions.
Naik, Siddhi D.,Chandra, Girish,Sahu, Pramod K.,Kim, Hong-Rae,Qu, Shuhao,Yoon, Ji-seong,Jeong, Lak Shin The Royal Society of Chemistry 2016 ORGANIC CHEMISTRY FRONTIERS Vol.3 No.11
<▼1><P>Synthesis of 3′-<I>C</I>-substituted-(<I>N</I>)-methanocarba adenosines using stereoselective cyclopropanation, stereoselective nucleophilic addition, regioselective isopropylidene cleavage and regioselective cyclic sulfate condensation.</P></▼1><▼2><P>Stereo- and regio-selective synthesis of 3′-<I>C</I>-substituted-(<I>N</I>)-methanocarba adenosines 3a–c as potential anticancer agents was achieved by employing stereoselective cyclopropanation, stereoselective nucleophilic addition, regioselective isopropylidene cleavage and regioselective base condensation of cyclic sulfate as key steps.</P></▼2>
Naik, S. Sankar,Rajagopal Reddy, V.,Choi, Chel‐,Jong,Bae, Jong‐,Seong John Wiley Sons, Ltd. 2012 Surface and interface analysis Vol.44 No.1
<P><B>Abstract</B></P><P>Palladium/Vanadium (Pd/V) Schottky structures are fabricated on <I>n</I>‐type InP (100) and the electrical, structural and surface morphological characteristics have been studied at different annealing temperatures. The extracted barrier height of as‐deposited Pd/V/<I>n</I>‐InP Schottky diode is 0.59 eV (I–V) and 0.79 eV (C–V), respectively. However, the Schottky barrier height of the Pd/V Schottky contact slightly increases to 0.61 eV (I–V) and 0.84 eV (C–V) when the contact is annealed at 200 °C for 1 min. It is observed that the Schottky barrier height of the contact slightly decreases after annealing at 300, 400 and 500 °C for 1 min in N<SUB>2</SUB> atmosphere. From the above observations, it is clear that the electrical characteristics of Pd/V Schottky contacts improve after annealing at 200 °C. This indicates that the optimum annealing temperature for the Pd/V Schottky contact is 200 °C. Basing on the auger electron spectroscopy and X‐ray diffraction results, the formation of Pd‐In intermetallic compound at the interface may be the reason for the increase of barrier height upon annealing at 200 °C. The formation of phosphide phases at the Pd/V/<I>n</I>‐InP interface could be the reason for the degradation in the barrier heights after annealing at 300, 400 and 500 °C. From the AFM results, it is evident that the overall surface morphology of the Pd/V Schottky contacts is fairly smooth. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Naik, Ravi,Won, Misun,Kim, Bo-Kyung,Xia, Yan,Choi, Hyun Kyung,Jin, Guanghai,Jung, Youngjin,Kim, Hwan Mook,Lee, Kyeong American Chemical Society 2012 Journal of medicinal chemistry Vol.55 No.23
<P>A series of (<I>E</I>)-phenoxyacrylic amide derivatives were synthesized and evaluated as hypoxia inducible factor (HIF) 1α inhibitors. The present structure–activity relationship study on this series identified the morpholinoethyl containing ester <B>4p</B> as a potent inhibitor of HIF-1α under hypoxic conditions (IC<SUB>50</SUB> = 0.12 μM in a cell-based HRE reporter assay) in HCT116 cells. The representative compound <B>4p</B> suppressed hypoxia-induced HIF-1α accumulation and targeted gene expression in a dose-dependent manner. The effect of HIF-1α inhibition by <B>4p</B> was further demonstrated by its inhibitory activity on in vitro tube formation and migration of cells, which may be valuable for development of novel therapeutics for cancer and tumor angiogenesis.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jmcmar/2012/jmcmar.2012.55.issue-23/jm301419d/production/images/medium/jm-2012-01419d_0016.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jm301419d'>ACS Electronic Supporting Info</A></P>
Naik, Gautam Kumar,Majhi, Sanjit Manohar,Jeong, Kwang-Un,Lee, In-Hwan,Yu, Yeon Tae Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.771 No.-
<P><B>Abstract</B></P> <P>The current study concerns about the large band gap of TiO<SUB>2</SUB> for its use as photocatalysts. The photocatalytic activity of core-shell structured Au@TiO<SUB>2</SUB> nanoparticles were enhanced by the doping of nitrogen. The nitrogen doping has been done by simple hydrothermal method taking ethylenediamine as the precursor for nitrogen. The crystals structure of TiO<SUB>2</SUB> shell remained unaltered even with the introduction of nitrogen. The photocatalytic activity of the prepared samples were evaluated towards the hydrogen evolution from photocatalytic water splitting under solar light irradiation. It was found that nitrogen doped core-shell structured Au@TiO<SUB>2</SUB> nanoparticles (Au@N-TiO<SUB>2</SUB>) showed higher photocatalytic activity with an average H<SUB>2</SUB> evolution rate of 4880 μmol h<SUP>−1</SUP>g<SUP>−1</SUP>, which is 3.79 times more than that of bare TiO<SUB>2</SUB> in 4 h under xenon light irradiation. The relationship among the other samples was in order of Au@N-TiO<SUB>2</SUB> > Au@TiO<SUB>2</SUB> > N-TiO<SUB>2</SUB> > TiO<SUB>2</SUB>. This enhanced photocatalytic activity of Au@N-TiO<SUB>2</SUB> can be responsible for the formation of an plasmonic photocatalyst and the formation of an impurity band between the conduction band (CB) and the valence band (VB) of TiO<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen (N) was doped on the core-shell structured Au@TiO<SUB>2</SUB> nanoparticles. </LI> <LI> N was doped via a low temperature microwave assisted hydrothermal process. </LI> <LI> N doped Au@TiO<SUB>2</SUB> core-shell are highly absorbed in whole of the solar spectrum. </LI> <LI> There was no morphological distortion during N doping. </LI> <LI> Synthesized catalysts are highly efficient for photocatalytic hydrogen evolution. </LI> </UL> </P>
Naik, Prafulla-Ramchandra,Singh, Girija-Shankar,Pandeya, Surendra-Nath,Singh, Paras-Nath The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.4
The titled compounds have been synthesized by the oxidative cyclization of N-ethyl-N'-aryl-thioureas and screened for their anti-inflammatory and analogesic activities. Some of the compounds exhibit significant activities.