Judul: Inovasi Dinding Pengisi Menggunakan Sampah Kaleng Minuman dan Rangka Bambu
Abstrak: Pertumbuhan penduduk yang pesat mengakibatkan terjadinya peningkatan volume sampah yang harus dikelola setiap hari, contohnya kemasan kaleng minuman. Selain itu, juga menimbulkan tingginya permintaan akan hunian sehingga penggunaan bata merah sebagai bahan baku dinding konvensional juga meningkat. Namun faktanya, produksi bata merah dapat menimbulkan kerusakan lingkungan. Tujuan dari penelitian ini meliputi memanfaatkan sampah minuman kaleng sebagai bahan baku dinding pengisi, mengetahui kualitas dinding pengisi kaleng minuman dari nilai kuat tekan dan kuat lentur, menganalisis perbandingan biaya pekerjaan serta analisis dampak dinding kaleng minuman dan bata merah. Penelitian ini terdiri dari tiga tahapan yaitu tahapan persiapan, pembuatan dan pengujian bahan uji. Selain itu, analisis perbandingan biaya menggunakan harga satuan Kabupaten Bogor tahun 2014. Sampah kaleng minuman dapat dimanfaatkan menjadi material untuk dinding pengisi. Berat dinding kaleng 50.63% lebih ringan dibandingkan dinding pasangan bata dan ketebalan dinding yang dihasilkan yaitu 11 cm. Berdasarkan hasil perhitungan, nilai kuat tekan (fc’) rata-rata sebesar 2.313 MPa untuk dinding pasangan bata, sedangkan dinding kaleng minuman sebesar 1.905 MPa. Selain itu, nilai kuat lentur (flt) rata-rata dinding pasangan bata sebesar 1.015 MPa, sedangkan untuk dinding kaleng sebesar 1.297 MPa. Biaya pekerjaan dinding bata 1 m2 yaitu sebesar Rp203 860, sedangkan dinding kaleng minuman yaitu sebesar Rp159 747.74 untuk asumsi 1 dan Rp171 997.74 untuk asumsi 2, sehingga biaya pekerjaan dinding kaleng minuman lebih murah dibandingkan dinding bata dengan selisih sebesar Rp44 112.26 dan Rp31 862.26 per 1 m2. Berdasarkan analisis dampak, penggunaan dinding pengisi kaleng minuman dan rangka bambu memberikan dampak positif terhadap lingkungan, sehingga layak digunakan dan diterapkan oleh masyarakat sebagai dinding pengisi alternatif.
Keyword: analisis biaya, analisis dampak, dinding kaleng minuman, dinding pasangan bata, kuat tekan, kuat lentur

Judul: Ecobrick Sebagai Solusi Dinding Nonstruktural Ramah Lingkungan
Abstrak: Pertumbuhan penduduk mengakibatkan peningkatan kebutuhan tempat tinggal yang berdampak pada tingginya permintaan batu bata. Namun, batu bata memiliki dampak negatif terhadap lingkungan karena bahan pembuatan dan proses produksinya. Pertumbuhan penduduk juga mengakibatkan peningkatan jumlah sampah plastik yang berisiko pada kesehatan dan lingkungan. Tujuan penelitian ini menganalisis kuat tekan dan lentur dinding bata dan ecobrick (botol PET berisi sampah plastik), mengetahui tingkat perbedaan kekuatan kedua dinding, dan membandingkan biaya pembuatan dinding. Penelitian ini dimulai dari persiapan, pembuatan, perawatan, dan pengujian benda uji. Analisis biaya mengacu pada harga satuan yang berlaku di Kabupaten Bogor Tahun 2019. Hasil analisis yang diperoleh ialah kuat tekan dinding bata lebih tinggi dari ecobrick, bata 2,38 MPa dan ecobrick 1,31 MPa. Kuat lentur dinding ecobrick lebih tinggi dibandingkan bata, ecobrick 1,23 MPa dan dinding bata 1,18 MPa. uji T menunjukkan kuat tekan kedua dinding berbeda secara signifikan, sedangkan kuat lenturnya tidak berbeda secara signifikan. Biaya pembuatan dinding ecobrick lebih murah 20% dari biaya pembuatan dinding bata.
Keyword: Batu bata, dinding nonstruktural, ecobrick, kuat lentur, kuat tekan

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