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Balamurugan Guru,Ramesh Veerappan,Francis Sangma,Somnath Bera 대한공간정보학회 2017 Spatial Information Research Vol.25 No.6
In the present research work, the landslide susceptibility zonation (LSZ) mapping was carried out for the landslide prone area Nilgiri hills, Tamil Nadu, India. The LSZ mapping was carried out using ten landslide influencing factors along with extensive field investigation. The geospatial database was prepared through integrated remote sensing, geographical information systems, and GPS technologies. The methods adopted for the present study are frequency ratio (FR) which is probabilistic and analytical hierarchical process (AHP) which is subjective and objective based model. The FR values were evaluated through evaluating relationship between causative factors and past landslide (training) locations. The FR values were considered as the base for assigning the weights in AHP method along with the subjective knowledge. The final LSZ map were derived through the spatial integration of all causative factors and classified as different susceptibility classes viz. very low, low, moderate, high, and very high. The prediction accuracy of final LSZ map were validated using past landslide (validation) locations using area under curve (AUC) method. The FR model shown the highest prediction accuracy with AUC value of 0.6279, while the AHP model shown the AUC value of 0.5620.
Antonio Montes,Chandrasekar Chinnarasu,Clara Pereyra,Lourdes Casas,María Teresa Fernández-Ponce,Casimiro Mantell,Sangma Pattabhi,Enrique Martínez de la Ossa 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
Various extracts from olive leaves have been precipitated by a supercritical antisolvent (SAS) process to evaluate the possibility of producing polyphenol fine particles with controlled size and size distribution. Olive leaves were initially extracted with subcritical fluids using mixtures of CO2+ethanol at 10% and 50%, by pressurized liquid extraction (PLE) with water, ethanol and a hydroalcoholic mixture (50 : 50) (v/v), and also by conventional ethanol extraction (CE). PLE gave the extract with the highest yield and the best antioxidant activity. SAS precipitation was unsuccessful for the extracts obtained with pressurized water and with the hydroalcoholic mixture (50 : 50) (v/v). The SAS precipitates with the smallest particle sizes were produced from extracts obtained with subcritical fluids. The SAS precipitates obtained after the conventional ethanol extraction of olive leaves showed the best antioxidant activity.