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- 검색키워드
- 저자 : Naik, Gajanan R. (검색결과 271 건)
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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>
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Naik, P.K.,Mehra, Usha R.,Kalicharan, Kalicharan,Varshney, V.P.,Dass, R.S. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.2
An experiment was conducted to study the effect of feeding ammoniated wheat straw treated with HCl on blood biochemical profiles in growing male buffalo (Bubalus bubalis) calves. Twenty-four growing male buffalo calves (one year of age, 88.54${\pm}$3.81 kg average body weight) were divided into three groups in a completely randomized design on the basis of their body weight. Animals in all the three groups were fed on concentrate mixture. In addition, they were offered wheat straw, ammoniated wheat straw (4% urea at 50% moisture level) and HCI treated ammoniated wheat straw (4% urea at 50% moisture level and HCl added to trap 30% of the NH3 evolved) in groups I, II and III, respectively for a period of 180 days, as per Kearl (1982) for body weight gain of 500 g/d. In all diets, concentrate:roughage ratio was fixed at 50:50 and were made isonitrogenous by adjusting CP levels of conc. mixtures. Blood was collected from jugular vein of each buffalo calf at the beginning and subsequently at two months interval of experimental feeding. Due to urea-ammoniation, the CP content of wheat straw increased from 2.90 to 6.96% and addition of HCl along with urea further increased the CP content to 10.09%. In all the three groups, the mean values of plasma glucose (mg %) and serum globulin (g %), showed a decreasing trend, while the mean value of serum TP (g %), serum A:G ratio, serum urea (mg %), serum creatinine (mg %), serum ALP (KA units), SGOT (units/ml.), SGPT (units/ml), serum T$_3$ and T$_4$ (ng/ml) showed an increasing trend with the advancement of feeding period. The cumulative period mean values of serum TP (6.15 to 6.20 g %), serum albumin (3.07 to 3.18, g %), serum globulin (2.98 to 3.09, g %), serum A:G ratio (1.03 to 1.10), serum ALP (23.15 to 23.63, KA units), serum T$_3$ (1.20 to 1.23 ng/ml) and serum T$_4$ (21.33 to 21.88 ng/ml) were comparable among the groups. The cumulative period mean plasma glucose (mg %) in group III (57.28) was similar to groups I (55.31) and II (59.41), however, the cumulative period mean plasma glucose in group II was significantly (p<0.01) higher than group I. The cumulative period mean serum urea (mg %) in group III (47.34) was significantly (p<0.001) higher than group I (38.38) and II (42.24), which were statistically alike. However, the cumulative period mean serum creatinine values (mg %) in groups II (1.43) and III (1.52) were similar and were significantly (p<0.01) higher than group I (1.24). The cumulative period mean SGOT (units/ml) in groups I, II and III was 91.71, 96.04 and 96.64, respectively. Similarly the cumulative period mean SGPT (units/ml) was 19.00, 19.93 and 20.01 in groups I, II and III, respectively. The cumulative period mean values of SGOT (p<0.05) and SGPT (p<0.001) in groups II and III were similar and were significantly higher than group I. The cumulative period mean serum T$_3$ and T$_4$ values in groups I (1.21 and 21.81), II (1.23 and 21.42) and III (1.20 and 21.33) were comparable. From the present study it may be concluded that feeding of AWS treated with and without HCI to growing male buffalo calves for 180 days had no significant adverse effect on blood biochemical profile.
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Naik Aditi Venkatesh,Sellappan Krishnan 경희대학교 융합한의과학연구소 2021 Oriental Pharmacy and Experimental Medicine Vol.21 No.4
The use of plants as a source of palliative or treatment for cancer is quite widespread worldwide. Annona muricata L. (Graviola) exhibits a wide array of ethno-medicinal and curative properties, accredited to different plant organs. The bio-activity of this plant is characterized by the production of secondary metabolites like alkaloids, phenols and most importantly annonaceous acetogenins found uniquely in this plant group. While A. muricata is gaining recognition as anti-cancer treating plant, the present study was undertaken to affirm probable genotoxic effect of pulp and leaf hydro-methanolic extracts in comparison with potent acetogenin, Annonacin on DNA of breast cancer (MCF-7) cells using alkaline comet assay. Genotoxic effects were evaluated using single cell gel electrophoresis (SCGE) method and the tail parameters from pooled comets were scored using TriTek CometScore Pro ver. 1.01.44 software. The average tail length (TL), percentage of tail DNA (TD), tail moment (TM) and Olive tail moment (OTM) were calculated which indicates the extent of DNA damage in cells followed by Statistical analysis. Study revealed the highest DNA damage toward MCF-7 cells in the form of comet streak or tails in 0.01 mg/mL Annonacin treatment. While the leaf extracts of A. muricata showed significantly higher tail parameters than the pulp extract in relation to untreated control. Our findings indicated that among the two extracts from A. muricata tested, the leaf exhibited better genotoxic potential compared to pulp extract, however, the plant extracts showed lesser efficacy in comparison with standard annonacin compound. Thus, this study further calls for more methodical safety evaluation and other end-points of genotoxicity apart from DNA damage.
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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>
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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.
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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.
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Effect of grain refinement on the performance of AZ80 Mg alloys during wear and corrosion
Naik, Gajanan M,Gote, Gopal D.,Narendranath, S,Kumar, S.S. Satheesh Techno-Press 2018 Advances in materials research Vol.7 No.2
Magnesium and its alloys are attracted towards all engineering applications like automotive, marine, aerospace etc. due to its inherent high strength to weight ratio. But, extensive use of Mg alloys is limited to the current scenario because of low wear and corrosion resistance behavior. However, equal channel angular press is one of the severe plastic deformation technique which has been effective method to improve the wear and corrosion resistance by achieving fine grain structure. In this study, the effect of grain refinement on wear and corrosion resistance of AZ80 Mg alloys were investigated. The wear behavior of the coarse and fine-grained Mg alloys was examined through $L_9$ orthogonal array experiments in order to comprehend the wear behavior under varies control parameters. It was shown that ECAPed alloy increased the wear and corrosion resistance of the Mg alloy through the formation of fine grain and uniform distribution of secondary ${\beta}-phase$. Also, the performance of AZ80 Mg alloy for these changeswas discussed through SEM morphology.
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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.
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