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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>
Damping-off Disease in Mulberry Seedlings and Its Management
Naik, V.Nishitha,Sharma, D.D.,Chowdary, N.B.,Mala, V.R. Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.8 No.2
During the routine survey, the mortality of mulberry seedlings was noticed due to damping-off disease. The disease recognized by rotting of emerged seedlings near the soil line (just below the soil level) resulting in collapse of the seedlings. Two fungi were isolated from affected samples and identified as Alternaria alternata (Fr.) Keissler and Fusarium solani (Mart.) Sacc. Both the fungi were found to be responsible in causing pre and post emergence damping-off of seedlings in mulberry. For management of the disease, an experiment was conducted using fungicides. These fungicides were applied as seed treatment; soil drenching and foliar spray alone and in combination. Among the different treatments, integration of seed treatment and soil application of Dithane M-45 (Mancozeb 75% WP) + Bavistin (Carbendazim 50% WP) followed by foliar spray of these fungicides (after 35 days of sowing) resulted in better survivability of seedlings (93.3 %) on $90^th$ day and controlled the pre and post emergence damping off by 100 and 89.5%, respectively over the check.
Evidence of Late Pleistocene earthquake from the Central Segment of Ulsan Fault
Naik Sambit Prasanajit,Ohsang Gwon,Kiwoong Park,Hyeonjo Shin,Young-Seog Kim 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Due to lack of surface-rupturing earthquakes during the instrumental earthquake recording time, the Korean peninsula has not been considered as seismically active country. Although there are several historic records of seismic damage, especially along with the southeastern part of the Korean Peninsula, the locations and sizes of most of these earthquakes are not well constrained. The historical record suggests the southeastern part of the Korean peninsula have experienced several damaging earthquakes including the recent 2016 Gyeongju and 2017 Pohang earthquakes. Since Pliocene, this area is under the compressional tectonic regime, which resulted in the formation of Yangsan-Ulsan Fault System. The Yangsan Fault has relatively clear geometry and well preserved morphological feature, and more studies have done along this fault than the Ulsan Fault with more complex structural characteristics. Although the central part of the Ulsan fault is one of most well studied area in terms of paleoseismology, most of the studies are confined to outcrop scale. There is ambiguity still remains towards the trace of the fault lines and recurrence interval of surface rupturing earthquakes in historical past. This study is an attempt to trace the Ulsan Fault line and understand the recurrence interval of earthquakes along the central part of the Ulsan fault. Considering this aim, detailed geomorphic mapping and paleoseismic study has been conducted at 2 sites near Hwalsung-ri, close to Gyeongju city. The Trenches were named as Hwalsung-ri North and Hwalsung-ri South. The present paleoseismic study reveals evidences of multiple earthquakes history along the central segment of the Ulsan fault near Hwalsung-ri. The crosscutting relationship of the exposed stratigraphic units at Hwalsung-ri North suggests the fault has been reactivated more than four times with evidences of four earthquake events whereas the Hwalsung-ri South site shows the evidences of three faulting events. Due to unavailability of suitable material and presence of pebbles we were not able to obtain ages for all the lithounits exposed in the trench. With this constraints, the Hwalsung-ri north site shows evidences of the most recent event occur after 103±2 ka whereas the Hwalsung-ri south trench suggests the most recent event occurred after 61±3 ka. This will help us to understand the past seismicity along the central segment of the Ulsan Fault and to trace the exact location of Ulsan fault which is one of the most potentially dangerous faults in Korea.
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.
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 B Naveen,Manoj Kumar Jaiswal,Venkata Ganesh,Ajay Singh,Shyam Charan Meena,Vamsidhar Amburu,Shiv Lal Soni 대한치과마취과학회 2022 Journal of Dental Anesthesia and Pain Medicine Vol.22 No.5
Background: Low-dose dexmedetomidine may be a suitable alternative to opioids for pediatric ambulatory procedures under general anesthesia (GA). However, the recovery profile remains unclear. Herein, we aimed to evaluate the effects of low-dose dexmedetomidine on the recovery profile of children. Methods: Seventy-two children undergoing ambulatory oral rehabilitation under GA were randomly and equally distributed into two groups (D and F). Group D received an infusion of dexmedetomidine 0.25 μg/kg for 4 min for induction, followed by maintenance of 0.4 μg/kg/h. Group F received an infusion of fentanyl 1 μg/kg over 4 min for induction, followed by maintenance at 1 μg/kg/h. The primary outcome was the extubation time. The secondary outcomes were awakening time, end-tidal sevoflurane (ET-Sevo) requirement, change in hemodynamic parameters, Richmond Agitation–Sedation Scale (RASS), Children's Hospital of Eastern Ontario pain scale (CHEOPS) score, length of PACU stay, and incidence of adverse events. Results: Statistically significant differences were observed in the recovery profile between the groups: the median time for extubation was 3.65 (3.44–6.2) vs. 6.25 (4.21–7) minutes in groups D vs. F (P=0.001), respectively, while the corresponding awakening times were 19 (18.75–21) and 22.5 (22–24) minutes, respectively (P < 0.001). The mean ET-Sevo was low in group D (1.1 vs. 1.2; P < 0.001). The heart rate was significantly low across all time points in group D, without resulting in bradycardia. The median RASS and CHEOPS scores were also significantly lower in group D. No significant differences were observed in the mean arterial pressure, incidence of adverse events, or length of PACU stay. Conclusion: Low-dose dexmedetomidine was more effective than fentanyl as an opioid substitute at providing a better recovery profile in pediatric ambulatory oral rehabilitation under GA. Dexmedetomidine also significantly reduced sevoflurane consumption without causing adverse events or prolonging hospital stay.