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RISS 인기검색어
- 검색키워드
- 저자 : Navpreet Kaur (검색결과 3 건)
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Shelf Life Study of NiO Nanowire Sensors for NO2 Detection
Navpreet Kaur,Dario Zappa,Elisabetta Comini 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.6
In this letter, conductometric sensing devices based on VLS grown NiO nanowires were presented for the detection of lowconcentrations of NO2. Moreover, the shelf life of sensing devices stored in ambient environmental conditions was testedover a period of 6 months. The VLS grown NiO nanowires were uniform in nature, covering completely the substrate surfacearea, with diameters ranging from 10 to 50 nm. The sensing devices show excellent performances, such as good stability, highresponse, outstanding selectivity toward NO2and low detection limit. The devices were tested toward different analytes suchas H2,acetone, NO2,etc. Indeed, at optimal working temperature, they show highly selective behavior towards NO2. Finally,the shelf life study reports that, due the exposure to the atmosphere, NiO nanowires exhibit a decrease in their conductivity,which enhances the response of the sensor.
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Multi-wavelength Study of Blazars Using Variability as a Tool
Kiran S. Baliyan,Navpreet Kaur,Sunil Chandra,Sameer,Shashikiran Ganesh 한국우주과학회 2016 Journal of Astronomy and Space Sciences Vol.33 No.3
Active galactic nuclei (AGN) are too compact to be resolved by any existing optical telescope facility, making it difficult to understand their structure and the emission processes responsible for their huge energy output. However, variability, one of their characteristic properties, provides a tool to probe the inner regions of AGN. Blazars are the best candidates for such a study, and hence a considerable amount of effort is being made to investigate variability in these sources across the electromagnetic spectrum. Here, using the Mt. Abu infrared observatory (MIRO) blazar monitoring program, we present intra-night, inter-night, and long term aspects of the variability in S5 0716+71, 3C66A, and OJ 287. These stars show significant variability on short (a few tens of mins, to a few hours, to a few days) to long term (months to years) timescales. Based on the light travel time argument, the shortest variability timescales (micro-variability) provide upper limits to the size of the emission region. While S5 0716 shows a very high duty cycle of variability (> 80 %), 3C66A shows a much lower intra day variability (IDV) duty cycle (< 20 %). All three show rapid variations within 2.5 to 3.5 hr, which, perhaps, are generated near the vicinity of black holes. Assuming this, estimates of the masses of the black holes are made at ~109, 8×108, and 2.7×109 M⨀ for S5 0716+71, 3C66A, and OJ 287, respectively. Multi-wavelength light-curves for the blazar PKS 1510-089 are discussed to infer the emission processes responsible for the recent flaring episodes in this source.
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R. S. Singh,Navpreet Kaur 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.5
Central composite rotatable design of RSM was used for the optimization of medium composition for pullulan production from de-oiled rice bran by Aureobasidium pullulans in shake-flask fermentations. The sugars from de-oiled rice bran were extracted in distilled water under moist steam pressure and the obtained de-oiled rice bran extract (DRBE) was used for the optimization of medium composition. RSM optimized medium components (DRBE sugars, 3.88%; yeast extract, 0.24%; (NH4)2SO4, 0.06%; K2HPO4, 0.57% (w/v), and pH, 5.22) supported 5.48% (w/v) pullulan production and 0.88 (A600/100) biomass yield. Coefficient of determination for pullulan production (0.99) and biomass yield (0.99) was close to 1.0 which justifies significance of model. Lack of fit for both responses was non-significant, which shows fitness of quadratic model. FTIR and NMR spectral attributes confirmed the structure of pullulan. XRD patterns verified the amorphous nature of pullulan. De-oiled rice bran was found as a potential substrate for pullulan production.
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