Judul: Utilization of Himawari-8 Hotspot Data for Land and Forest Fires Tracing, Utilization of Himawari-8 Hotspot Data for Land and Forest Fires Tracing
Abstrak: The use of hotspots in the early warning system for forest and land fires has been applied and is considered successful. Currently, there are regulations governing the use of hotspots in the above context, as stated in regulation No. P.8/Menlhk/Setjen/Kum.1/3/2018 concerning Fixed Procedures for Field Checking of Hotspot Information and/or Forest and Land Fires Information. However, over time, currently in Indonesia hotspot data has also been used to trace fire propagation as one of the evidences of the cause (source of fire) in cases of forest and land fires. Hotspot data used for tracking forest and land fires generally comes from the Terra/Aqua (MODIS), NOAA (AVHRR), and SNPP (VIIRS) satellites. The three satellites have a recording frequency of 12 – 24 hours per day so as to produce satellite data with low temporal resolution, even though currently there is hotspot data available with a temporal resolution of 10 minutes, namely hotspots from AHI (Advanced Himawari Imager) data from the Himawari-8 satellite. This study examined the use of AHI (Himawari-8) hotspot data compared to MODIS, AVHRR, and VIIRS for forest and land fires tracing in Seruyan Hilir, Tanjung Puting National Park, and the area between the Barito and Negara rivers. This study begins with the identification of the time period of the fire’s incidence on the Sentinel-2. Forest and land fires indicator has been observed from the appearance of flames, burn scar, and plumes of smoke. Furthermore, Hotspots were selected at a confidence level ≥80%. This analysis was based on the detection time series of hotspots. The study showed that AHI (Himawari-8) hotspots could be used to see fire propagation and explain the phenomenon of hotspot leaps (hotspot discontinuity). In addition, AHI (Himawari-8) hotspots can also be used to detect fires that rapidly spread and easily extinguish in low biomass areas. Based on these results, the use of AHI (Himawari-8) hotspots can be used in tracing the initial source of fire in cases of forest and land fires.
Keyword: resolusi temporal, Himawari-8, rambatan kebakaran hutan dan lahan

Judul: Studi sebaran titik panas (Hotspot) sebagai indikator kebakaran hutan dan lahan di Propinsi Jambi tahun 2000 - 2004
Abstrak: Deteksi kebakaran hutan merupakan salah satu kegiatan yang penting dalam pengendalian kebakaran hutan. Salah satu cara deteksi kebakaran adalah melakukan deteksi titik panas (hotspot) dengan menggunakan satelit NOAA (National Oceanic and Atmospheric Administration), yang dilengkapi dengan sensor AVHRR (Advanced Very High Resolution Radiometer). Suatu areal yang bersuhu 42oC, dapat mengindikasikan adanya titik panas (hotspot).
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Judul: Optimization of Alginate-Chitosan Microcapsules Formation for Leydig Cells Encapsulation
Abstrak: Hypogonadism is a clinical condition characterized by low concentrations of testosterone. It is caused by malfunction of Leydig cells in producing testosterone. Encapsulation method will protect the transplanted cells from the immune system rejection. The aims of this study was to optimize the formation of microcapsules for Leydig cells encapsulation. The microcapsules were made of alginate and chitosan as the first and the second coating agents, respectively. The result showed that the minimum concentration of alginate was 1.5% (w/v) with a viscosity of 33.8 cPs, resulted spherical microcapsules with diameters of 230-270 µm. The optimum concentration of chitosan as the second coating agent was 0.5% (w/v), resulted spherical microcapsule with mechanical stability in 4 hours. Leydig cells can be trapped inside the capsule with a density that proportional with concentration of cells used in the encapsulation.
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