Judul: Rancang Bangun Sistem Analisis Finansial Pada Pembuatan Digester Tipe Fixed Dome Berbasis Web
Abstrak: Reaktor biogas atau yang disebut dengan digester merupakan tempat terjadinya perubahan kotoran padat organik menjadi gas yang disebut dengan biogas. Biogas mudah terbakar karena mangandung campuran antara metana dan karbondioksida sehingga dapat dimanfaatkan sebagai bahan bakar. Tujuan dari penelitian ini ialah membangun sistem yang dapat menentukan tipe digester yang tepat sesuai dengan kebutuhan pengguna, serta menentukan biaya dan kelayakan dari digester dengan berbasis web. Kebutuhan pengguna yang dianalisis yaitu jumlah sapi yang dimiliki, luas lahan yang tersedia, serta jumlah rumah tangga yang menggunakan biogas. Ketiga faktor tersebut akan menentukan tipe digester yang sesuai untuk digunakan. Digester yang dianalisis bertipe Fixed Dome Beton dan Fiberglass dengan ukuran yang setara. Hasil pemilihan sistem pakar menunjukkan bahwa rata-rata kondisi pengguna menghasilkan kesimpulan tipe digester Fiberglass 17 m3 dan analisis finansialnya menjelaskan bahwa digester yang paling layak digunakan juga digester yang sama. Sistem analisis finansial berbasis web ini kemudian dievaluasi oleh pengguna yang menyatakan bahwa sistem ini bermanfaat serta butuh pengembangan lebih lanjut.
Keyword: biogas, digester, fixed dome, sistem pakar

Judul: Sistem konsultasi rancang bangun digester berbasis WEB
Abstrak: Tingkat kebutuhan energi yang diperlukan oleh manusia semakin banyak, namun sumber daya umum yang sering digunakan sudah semakin berkurang. Biogas adalah salah satu sumber energi alternatif yang memiliki potensi tinggi dalam memenuhi kebutuhan energi manusia. Biogas dapat dihasilkan dari berbagai jenis kotoran ternak, kotoran manusia, maupun sampah organik. Namun pengaplikasian biogas masih mendapat kendala karena minimnya pengetahuan dasar serta media konsultasi yang dimiliki oleh masyarakat, khususnya untuk para peternak. Tujuan penelitian ini adalah membuat sistem konsultasi berbasis web yang akan memberi kemudahan dalam hal konsultasi. Data mengenai ukuran pembuatan digester akan digambar menggunakan software SolidWorks yang nantinya bisa di unduh oleh user sebagai acuan pembuatan digester secara manual. Sistem akan secara langsung menampilkan gambar teknik digester dengan ukuran yang sesuai berdasarkan hasil konsultasi dengan sistem.
Keyword: Digester, Biogas, Reactor, Consultation system, Agriculture, Cyber extension

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