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Subhra Prakash Mandal,Abhisek Chakrabarty,Pranab Maity 대한공간정보학회 2018 Spatial Information Research Vol.26 No.2
Landslide is the most common natural hazard in Himalaya that mainly triggered by the earthquake and rainfall. Landslide Susceptibility analysis is the spatial prediction of landslide occurrence based on local terrain condition. In Sikkim, every year occurrences of intense rainfall and earthquake cause landslide and related casualties along different parts of national highways. The present study is on GIS-based landslide probability analysis with ‘Information Value’ and ‘Frequency Ratio Method.’ These methods are used to derive the weighted value of causative factors and classes for Landslide Susceptibility Zonation (LSZ) along major roads. Eleven causative factors viz. slope, elevation, aspect, relative relief, land use, NDVI, soil, lithology, distance to drainage, distance to lineament, and rainfall used for landslide susceptibility analysis. ‘Information value’ and ‘frequency ratio’ methods have predicted the probability of landslide susceptibility for the study area. Receiver Operating Characteristic (ROC) curves for landslide susceptibility are drawn for both the methods and derived area under curve value are found 0.88 and 0.84 respectively. These results suggest that the ‘Information Value’ method has better performance than ‘Frequency Ratio’ Method. This statistical method ROC curve result validated by field survey and ground truth data used for accuracy assessment of LSZ map.
Kossar Shahnaz,Amiruddin R.,Rasool Asif,Kumar M.C. Santhosh,Katragadda Nagamalleswari,Mandal Pranab,Ahmed Nafis 한국물리학회 2022 Current Applied Physics Vol.39 No.-
The present work reports on resistive switching (RS) characteristics of Neodymium (Nd)-doped bismuth ferrite (BFO) layers. The Nd (2–10 at%) doped BFO thin film layers were deposited using a spray pyrolysis method. The structural analysis reveals that a higher Nd doping concentration in BFO leads to significant distortion of the prepared Nd:BFO thin films from rhombohedral to tetragonal characteristics. The morphological analysis shows that all the deposited Nd:BFO thin films have regularly arranged grains. The X-ray photoelectron spectroscopy (XPS) analysis reveals that the prepared Nd:BFO thin films have a higher Fe 3+/Fe 2+ratio and less oxygen vacancy (VO) defects which enriches the ferroelectric characteristics in Nd:BFO layers. The polarization-electric field (P-E) and RS characteristics of the fabricated Nd:BFO-based RS device were examined. It was observed that the Nd (7 at%) doped BFO RS device shows large remnant polarization (P r) of 0.21 μC/cm2 and stable RS characteristics.
Production of nematode free plantlets in Polianthes tuberosa using in vitro culture techniques
Kanchan B. M. Singh,Jayanthi Madhavan,Raghunath Sadhukhan,Shivani Chandra,Uma Rao,Pranab Kumar Mandal 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5
Tuberose ( Polianthes tuberosa ) cultivation is tremendously aff ected due to Meloidogyne incognita infection. Histologicalstudy of in vitro nematode infected tuberose roots showed that the root infection initiated within 2 days post inoculation(DPI) and root gall formation occurred at 6 DPI indicating established infection on the roots. The life cycle of M. incognitain tuberose roots completed within 45 DPI evident by the formation of large number of eggs. Our study established in vitromethods like shoot tip culture and callus mediated regeneration of tubers collected from nematode infection fi elds to obtaincompletely nematode free plantlets. Tubers of diff erent varieties produced multiple shoot bud on Murashige and Skoog (MS)media containing 4 mg L −1 6-benzylaminopurine (BAP) and 0.1 mg L −1 α-naphthaleneacetic acid (NAA). Maximum numbersof plantlets were obtained for Calcutta Single (14.4 ± 2.0 per plant). Embryogenic callus was induced on MS medium supplementedwith altered concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D), NAA and BAP from leaf, fl ower, root andtuber explant. The maximum callus induction was obtained on MS containing 1 mg L −1 2,4-D, 1 mg L −1 NAA and 0.5 mg L −1BAP (100%) and 1 mg L −1 2,4-D and 2.25 mg L −1 BAP (96.7%). Regeneration of tuber callus was achieved on MS with0.5 mg L −1 Kinetin (KIN) within 3 weeks. Plantlets were rooted on ½ MS with 0.5 mg L −1 Indole-3-butyric acid for 25 days. The in vitro regeneration protocol developed can thus be used for producing disease free plantlets for mass propagation.