Judul: Hubungan Curah Hujan dengan Kejadian Kebakaran Hutan dan Lahan di Provinsi Sumatera Selatan
Abstrak: Forest existence in Indonesia is vulnerable due to a disturbance, particularly forest fire. One of the causes of forest and land fire is the weather condition which is so fierce in the drought season. South Sumatera is an area with high vulnerability of forest fire, it is included into three provinces with the highest forest fire occurrence in Indonesia. This research aim to analize the influence of precipitation toward the forest and land fire occurrences at South Sumatera province. The result shows that the drought season in South Sumatera occur from July until September, with the peak season at August. The number of hotspot increase between May until October with peak of forest fire occurrence at September, right after the peak of drought season at August. It is clearly showed that daily and 10-daily mean of daily precipitation could be used to explain forest fire occurences. The result of this research emphasize that forest fire prevention in South Sumatera strongly suggested to be started at May when the number of precipitation decrease drastically and the number of hotspot increase
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Judul: Pengaruh Curah Hujan terhadap Penurunan Titik Panas (Hotspot) di Indonesia Pada Tahun 2019-2020
Abstrak: Kebakaran hutan dan lahan merupakan fenomena yang sering terjadi di Indonesia setiap tahunnya. Terlebih banyaknya perubahan alih fungsi lahan, seperti di Pulau Sumatera dan Pulau Kalimantan. Hal tersebut dapat dilihat seperti terjadi di provinsi Jambi, Sumatera Selatan, Kalimantan Barat dan Kalimantan Tengah. Faktor iklim dapat mempengaruhi terjadinya kebakaran hutan dan lahan. Tujuan penelitian ini adalah mengetahui hubungan antara titik panas dengan curah hujan terhadap terjadinya penurunan kebakaran hutan dan lahan di Indonesia pada tahun 2019 dan khususnya 2020 di provinsi Jambi, Sumatera Selatan, Kalimantan Barat dan Kalimantan Selatan. Penelitian ini menggunakan data titik panas NASA MODIS, peta administrasi, dan data curah hujan dari BMKG. Hasil penelitian ini menunjukkan bahwa curah hujan sangat berpengaruh terhadap jumlah titik panas, apabila curah hujan rendah maka titik panas tinggi dan sebaliknya. Bulan Juli sampai November menjadi musim kering pada tahun 2019, sedangkan tahun 2020 pada bulan Agustus sampai Oktober. Dari hasil uji korelasi P-Value hanya Provinsi Kalimantan Selatan yang dibawah batas 0,05 yaitu 0,041. Sedangkan dari hasil uji korelasi R-Person Provinsi Jambi memilki notasi psositif (+). Hal ini menandakan curah hujan tidak berpengaruh nyata terhadap jumlah titik panas di kedua provinsi tersebut., Forest and land fires (karhutla) are a phenomenon that often occurs in Indonesia every year. Moreover, there are many changes in land use, such as on the islands of Sumatra and Kalimantan. For example in Jambi, South Sumatra, West Kalimantan and Central Kalimantan. Climatic factors can affect the occurrence of forest and land fires. The purpose of this study was to determine the relationship between hotspots and rainfall on the occurrence of forest and land fires in Indonesia 2019 to 2020. This study used NASA MODIS hotspot data, administrative maps, and rainfall data from the BMKG. The results of this study indicate that rainfall is very influential on the number of hotspots, if the rainfall is low then the hotspots is high and vice versa. July to November is the dry season in 2019, while 2020 is from August to October. From the results of the P-Value correlation test, only South Kalimantan Province is below the 0.05 limit, which is 0.041. Meanwhile, from the results of the R-Person correlation test, Jambi Province has a positive notation (+). Wich means that rainfall has no effect on the number of hotspot in the two provinces.
Keyword: fire, hotspot, precipitation, modis, correlation

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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