Judul: Pengaruh bahan peredam api seng chlorida (Zn Cl2) terhadap difat fisis dan mekanis kayu lapis
Abstrak: Pemberian bahan peredam api (fire retardant) seperti seng chlorida diperkirakan akan memberikan dampak negatif terhadap sifat fisik dan mekanik kayu lapis. Sehubungan dengan itu suatu penelitian telah dilakukan untuk mengetahui pengaruh pemberian seng chlorida tersebut terhadap sifat fisik dan mekanik kayu lapis. Penelitian dilakukan di Labora torium Jurusan Teknologi Hasil Hutan, Fakultas Kehutanan, Institut Pertanian Bogor, dengan melibatkan tiga macam kete balan kayu lapis, empat macam proses pengawetan dan empat taraf konsentrasi seng chlorida. Tingkat ketebalan kayu lapis yang digunakan adalah 3 mm, 6 mm dan 9 mm. Proses pengawetan yang digunakan yaitu dengan cara pelaburan dan dengan menggunakan tekanan 3 kg/cm², 6 kg/cm², dan 9 kg/cm² Sedangkan tingkat konsentrasi seng chlorida yang digunakan adalah kontrol (0%), 5%, 10% dan 15%. Model analisis yang digunakan adalah Pola Rancangan Acak Lengkap 3 x 4 x 4, dimana setiap perlakuan mendapat tiga ulangan.
Keyword: kayu lapis

Judul: Studi pengaruh penambahan bahan penghambat api flame out terhadap sifat fisis, mekanis dan ketahanan api kayu lapis struktural
Abstrak: Kayu lapis yang digunakan sebagai bahan bangunan dinamakan kayu lapis struktural. Salah satu kelemahan bahan bangunan ini terhadap faktor non biologis adalah mudah terbakar oleh api. Salah satu usaha untuk meningkatkan ketahanan kayu lapis struktural terhadap api adalah melapisinya dengan bahan penghambat api. Penggunaan kayu lapis struktural sebagai bahan konstruksi disyaratkan harus mampu menahan beban yang direncanakan. Apabila kayu lapis struktural terbakar maka kekuatan fisis maupun mekanisnya akan menurun. Oleh karena itu perlu suatu studi tentang pengaruh pemberian bahan penghambat api terhadap sifat fisis, mekanis dan ketahanan api kayu lapis struktural. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan bahan penghambat api dan tebal kayu lapis struktural terhadap sifat fisis, mekanis dan sifat ketahanan api. Penelitian ini dilakukan di Laboratorium Bahan Komposit, Pusat Penelitian dan Pengembangan Fisika Terapan, Lembaga Ilmu Pengetahuan Indonesia Pusat Penelitian Ilmu Pengetahuan dan Teknologi Serpong Jawa Barat.
Keyword: 

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