Judul: Studi Teknik Pemanenan Pada Produksi Ganggang Spirulina platensis Dengan Limbah cair pengolahan Lateks Sebagai Media Pertumbuhannya
Abstrak: Spirulina platensis mernpakan ganggang memiliki kegunaan dan nilai ekonomi yang tinggi. Limbah cair pengolahan lateks dapat digunakan sebagai media pertumbuhan ganggang tersebut. Permasalahan yang dihadapi dalam produksi ganggang ini adalah teknik pemanenan yang belum optimal, yaitu melalui penyaringan menggunakan kain blacu.
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Judul: Kandungan pigmen Spirulina platensis pada biakan media cair lateks
Abstrak: Limbah cair lateks merupakan sumber pencemar yang potensial, tetapi memiliki kandungan nutrisi yang berpotensi untuk media pertumbuhan mikrob. Spirulina platensis adalah mikroorganisme yang memiliki nilai ekonomis (penghasil protein sel tunggal, asam y-linolenat, dan pigmen; fikosianin, karotenoid, dan klorofil a) dan mampu tumbuh dalam media tersebut, sehingga dapat dimanfaatkan untuk pertumbuhan Spirulina selama penurunan kadar limbah. Pemanfaatan limbah cair lateks untuk produksi S platensis sebagai penghasil pigmen belum dilakukan. Penelitian ini akan melihat kandungan pigmen S. platensis hasil biakan yang mengandung limbah cair lateks (blakan sintetik) berdasarkan rapatan optik pada panjang gelombang 480 nm - 0.5, 1.0. 1.5. dan 2.0 dan mengamati pertumbuhannya sebagai penghasil pigmen tebanyak. Produktivitas S platensis kedua biakan dengan sistem pengadukan aerasi dan intensitas cahaya ternaungi. dicapai pada rapatan optik rendah (< 1.0). Biomassa yang diperoleh pada biakan sintetik (13.3305 g mh) lebih tinggi dibandingkan dengan yang tumbuh dalam media lateks (7.6757 g m h). Kadar pigmen biakan lateks lebih besar di awal pertumbuhan, hingga rapatan optik 1.0 dan kadarnya dapat mencapai 1.5 kali dari biakan sintetik (pigmen fikosianin, karotenoid, dan klorofil a biakan sintetik dan biakan lateks pada rapatan optik 0.5 berturut-turut (% bb); 13.18, 0.45, 0.54. dan 19.85. 0.61. 0.61. dan pada rapatan optik 1.0 ialah 14.62. 0.69, 0.73. dan 22.28. 0.91. 0.78).
Keyword: lateks, limbah cair, analisis pigmen, klorofil a

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