Aeromagnetic data over the Mamfe Basin have been processed. A regional magnetic gridded dataset was obtained from the Total Magnetic Intensity (TMI) data grid using a 3 × 3 convolution (Hanning) filter to remove ...Aeromagnetic data over the Mamfe Basin have been processed. A regional magnetic gridded dataset was obtained from the Total Magnetic Intensity (TMI) data grid using a 3 × 3 convolution (Hanning) filter to remove regional trends. Major similarities in magnetic field orientation and intensities were observed at identical locations on both the regional and TMI data grids. From the regional and TMI gridded datasets, the residual dataset was generated which represents the very shallow geological features of the basin. Processing this residual data grid using the Source Parameter Imaging (SPI) for magnetic depth suggests that the estimated depths to magnetic sources in the basin range from about 271 m to 3552 m. The highest depths are located in two main locations somewhere around the central portion of the study area which correspond to the area with positive magnetic susceptibilities, as well as the areas extending outwards across the eastern boundary of the study area. Shallow magnetic depths are prominent towards the NW portion of the basin and also correspond to areas of negative magnetic susceptibilities. The basin generally exhibits a variation in depth of magnetic sources with high, average and shallow depths. The presence of intrusive igneous rocks was also observed in this basin. This characteristic is a pointer to the existence of geologic resources of interest for exploration in the basin.展开更多
本实验采用外源蛋白添加和挤压相结合的技术通过增强混合体系内部的凝胶结构来改善大米粉面条弹韧性差、断条严重等问题。向大米粉中添加大豆分离蛋白(Soybean Protein Isolate,SPI)并经过挤压膨化处理制备混合米粉,选择SPI添加量、水...本实验采用外源蛋白添加和挤压相结合的技术通过增强混合体系内部的凝胶结构来改善大米粉面条弹韧性差、断条严重等问题。向大米粉中添加大豆分离蛋白(Soybean Protein Isolate,SPI)并经过挤压膨化处理制备混合米粉,选择SPI添加量、水分含量和挤压温度3个因素,以糊化特性和吸水性指数为指标优化混合米粉的最佳工艺,并对米面条的品质进行评价。各因素对混合米粉制备工艺的影响顺序:SPI添加量>水分含量>挤压温度,最佳工艺条件为SPI添加量10.23%(以400 g大米粉为基准)、水分含量25%和挤压温度133℃。将最优条件下制备的混合米粉与大米粉的吸水性指数、糊化特性和傅里叶红外光谱进行比较,表明混合米粉的吸水性指数远高于大米粉,糊化特性和短程有序程度均低于大米粉。混合米粉面条与大米粉面条相比干物质损失率和断条率有所下降,吸水率、感官评分、硬度、弹性和咀嚼性均升高。添加SPI的大米粉经挤压后制得混合米粉的吸水性和回生特性均有所改善,制作的混合米粉面条的蒸煮特性及感官品质较大米粉面条有显著的提升,不仅提高了大米粉的经济价值又利于促进稻米产业链的延伸,而且拓宽了以大米粉为原料的米制品在主食方面的应用范围。展开更多
Spatio-temporal analysis of drought provides valuable information for drought management and damage mitigation. In this study, the Standardized Precipitation Index at the time scale of 6 months (SPI-6) is selected to ...Spatio-temporal analysis of drought provides valuable information for drought management and damage mitigation. In this study, the Standardized Precipitation Index at the time scale of 6 months (SPI-6) is selected to reflect drought conditions in the North-Eastern coastal region of Vietnam. The drought events and their characteristics from 1981 to 2019 are detected at 9 meteorological stations and 10 Chirps rainfall stations. The spatio-temporal variation of drought in the study region is analyzed on the basis of the number, duration, severity, intensity, and peak of the detected drought events at the 19 stations. The results show that from 1981 to 2019 the drought events mainly occurred with 1-season duration and moderate intensity and peak. The number, duration, severity, and peak of the drought events were the greatest in the period 2001-2010 and were the smallest in the period 2011-2019. Among the 19 stations, the drought duration tends to decrease at 11 stations, increase at 7 stations, and has a slight variant at 1 station;the drought severity tends to decrease at 14 stations, increase at 4 stations, and has not a significant trend at 1 station;the drought intensity tends to decrease at 17 stations, increase at 1 station, and has a slight variant at 1 station;and the drought peak tends to decrease at 18 stations and increase at 1 station.展开更多
Drought is a common natural disaster worldwide, with varying durations, severity levels, and spatial extents. This study aimed to model the spatiotemporal variation of meteorological drought events in the Gabiley regi...Drought is a common natural disaster worldwide, with varying durations, severity levels, and spatial extents. This study aimed to model the spatiotemporal variation of meteorological drought events in the Gabiley region of Somaliland. The study utilized primary data collected from the meteorological station in Gabiley and CHIRPS (Climate Hazards Group InfraRed Precipitation with Station) data to develop the standardized precipitation index (SPI) at a 3-month timescale. The results of the study revealed that the study area was characterized by drought and received inadequate precipitation, resulting in catastrophic droughts that negatively impacted the socioeconomic situation of the community. Mild-to-severe meteorological drought events occurred every two to three years, with the most severe droughts occurring in 1998, 2002, 2009, 2015, and 2017. Specifically, the year 2015 experienced the most severe meteorological drought in the region during the studied period. The predominant type of drought was a mild year in the study area. The SPI was found to potentially identify meteorological drought, making it a useful tool for policymakers as they develop drought adaptation and mitigation policies. This study provides valuable information that can benefit local authorities and policymakers in creating drought mitigation and adaptation strategies in the Gabiley region.展开更多
文摘Aeromagnetic data over the Mamfe Basin have been processed. A regional magnetic gridded dataset was obtained from the Total Magnetic Intensity (TMI) data grid using a 3 × 3 convolution (Hanning) filter to remove regional trends. Major similarities in magnetic field orientation and intensities were observed at identical locations on both the regional and TMI data grids. From the regional and TMI gridded datasets, the residual dataset was generated which represents the very shallow geological features of the basin. Processing this residual data grid using the Source Parameter Imaging (SPI) for magnetic depth suggests that the estimated depths to magnetic sources in the basin range from about 271 m to 3552 m. The highest depths are located in two main locations somewhere around the central portion of the study area which correspond to the area with positive magnetic susceptibilities, as well as the areas extending outwards across the eastern boundary of the study area. Shallow magnetic depths are prominent towards the NW portion of the basin and also correspond to areas of negative magnetic susceptibilities. The basin generally exhibits a variation in depth of magnetic sources with high, average and shallow depths. The presence of intrusive igneous rocks was also observed in this basin. This characteristic is a pointer to the existence of geologic resources of interest for exploration in the basin.
文摘本实验采用外源蛋白添加和挤压相结合的技术通过增强混合体系内部的凝胶结构来改善大米粉面条弹韧性差、断条严重等问题。向大米粉中添加大豆分离蛋白(Soybean Protein Isolate,SPI)并经过挤压膨化处理制备混合米粉,选择SPI添加量、水分含量和挤压温度3个因素,以糊化特性和吸水性指数为指标优化混合米粉的最佳工艺,并对米面条的品质进行评价。各因素对混合米粉制备工艺的影响顺序:SPI添加量>水分含量>挤压温度,最佳工艺条件为SPI添加量10.23%(以400 g大米粉为基准)、水分含量25%和挤压温度133℃。将最优条件下制备的混合米粉与大米粉的吸水性指数、糊化特性和傅里叶红外光谱进行比较,表明混合米粉的吸水性指数远高于大米粉,糊化特性和短程有序程度均低于大米粉。混合米粉面条与大米粉面条相比干物质损失率和断条率有所下降,吸水率、感官评分、硬度、弹性和咀嚼性均升高。添加SPI的大米粉经挤压后制得混合米粉的吸水性和回生特性均有所改善,制作的混合米粉面条的蒸煮特性及感官品质较大米粉面条有显著的提升,不仅提高了大米粉的经济价值又利于促进稻米产业链的延伸,而且拓宽了以大米粉为原料的米制品在主食方面的应用范围。
文摘Spatio-temporal analysis of drought provides valuable information for drought management and damage mitigation. In this study, the Standardized Precipitation Index at the time scale of 6 months (SPI-6) is selected to reflect drought conditions in the North-Eastern coastal region of Vietnam. The drought events and their characteristics from 1981 to 2019 are detected at 9 meteorological stations and 10 Chirps rainfall stations. The spatio-temporal variation of drought in the study region is analyzed on the basis of the number, duration, severity, intensity, and peak of the detected drought events at the 19 stations. The results show that from 1981 to 2019 the drought events mainly occurred with 1-season duration and moderate intensity and peak. The number, duration, severity, and peak of the drought events were the greatest in the period 2001-2010 and were the smallest in the period 2011-2019. Among the 19 stations, the drought duration tends to decrease at 11 stations, increase at 7 stations, and has a slight variant at 1 station;the drought severity tends to decrease at 14 stations, increase at 4 stations, and has not a significant trend at 1 station;the drought intensity tends to decrease at 17 stations, increase at 1 station, and has a slight variant at 1 station;and the drought peak tends to decrease at 18 stations and increase at 1 station.
文摘Drought is a common natural disaster worldwide, with varying durations, severity levels, and spatial extents. This study aimed to model the spatiotemporal variation of meteorological drought events in the Gabiley region of Somaliland. The study utilized primary data collected from the meteorological station in Gabiley and CHIRPS (Climate Hazards Group InfraRed Precipitation with Station) data to develop the standardized precipitation index (SPI) at a 3-month timescale. The results of the study revealed that the study area was characterized by drought and received inadequate precipitation, resulting in catastrophic droughts that negatively impacted the socioeconomic situation of the community. Mild-to-severe meteorological drought events occurred every two to three years, with the most severe droughts occurring in 1998, 2002, 2009, 2015, and 2017. Specifically, the year 2015 experienced the most severe meteorological drought in the region during the studied period. The predominant type of drought was a mild year in the study area. The SPI was found to potentially identify meteorological drought, making it a useful tool for policymakers as they develop drought adaptation and mitigation policies. This study provides valuable information that can benefit local authorities and policymakers in creating drought mitigation and adaptation strategies in the Gabiley region.
