Judul: Densitas Radiografi Implan Besi (Fe) Berpori dan Reaksi Jaringan pada Persembuhan Tulang Femur Tikus Pascaimplantasi
Abstrak: Penelitian ini bertujuan menilai densitas film radiografi daerah implantasi pada tikus Sprague Dawley pascaimplantasi besi berpori. Tikus Sprague Dawleysebanyak 60 ekor digunakan dalam penelitian ini yang dibagi dalam 4 kelompok. Masing-masing kelompok terdiri atas 15 ekor tikus dengan perlakuan kontrol, besi berpori 450 μm, 580 μm, dan 800 μm. Tulang femur tikus dibuat celah pada bagian lateral tulang femur. Celah kemudian ditutup bahan implan besi berpori dengan ukuran 5 x 2 x 0.5 mm3 pada kelompok perlakuan. Gambar radiografi diambil pada hari ke-3, 37, 64, 97 pascaimplantasi. Film radiografi yang dihasilkan kemudian dianalisis untuk menilai densitas otot, tulang, implan, peri-implan proksimal tulang femur, peri-implan distal tulang femur, dan peri-implan otot. Hasil menunjukan bahwanilai densitasimplan besi (Fe) berpori secara umum mengalami penurunan selama proses persembuhan tulang. Nilai densitas jaringan tulang dan otot secara umum juga meningkat. Nilai densitas peri-implan besi (Fe) berpori pada semua ukuran jugamenurun. Kesimpulan yang dapat diberikan adalah ukuran pori implan besi berpengaruh terhadap proses persembuhan tulang.
Keyword: densitas, implan, jaringan, persembuhan, radiografi

Judul: Evaluasi Persembuhan Jaringan Jangka Panjang Pascaimplantasi Besi (Fe) Berpori secara Radiografi pada Tikus
Abstrak: Penelitian ini bertujuan menilai persembuhan jaringan jangka panjang pascaimplantasi besi (Fe) berpori pada tikus Sprague Dawley. Tikus Sprague Dawley sebanyak 60 ekor dibagi dalam 4 kelompok. Masing-masing kelompok terdiri atas 15 ekor tikus dengan perlakuan berdasarkan ukuran pori implan, yaitu 450 μm, 580 μm, 800 μm dan kontrol tanpa implan. Os femoris tikus bagian lateral dibuat luka defek pada permukaan kemudian ditutup bahan implan besi berpori dengan ukuran 5 x 2 x 0.5 mm3 pada kelompok perlakuan. Gambar radiografi diambil pada bulan ke-0, 6, 9 dan 12 pascaimplantasi. Film radiografi yang dihasilkan kemudian dianalisis pada nilai densitas implan, tulang proximal femur, tulang distal femur, otot, peri-implan otot dan peri-implan tulang femur. Hasil menunjukkan bahwa nilai densitas implan Fe berpori pada semua ukuran mengalami penurunan pada setiap waktu pengamatan. Nilai densitas tulang proximal, tulang distal, otot, peri-implan otot dan peri-implan tulang secara umum meningkat pada setiap waktu pengamatan kecuali perlakuan implan Fe berpori 800 μm. Simpulan yang dapat diberikan adalah ukuran pori implan besi berpengaruh terhadap persembuhan tulang hingga 12 bulan pascaimplantasi.
Keyword: implan, besi (Fe) berpori, persembuhan, densitas, radiografi

Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite