Judul: Uji Efikasi Bifentrin Dan Impralit Sebagai Bahan Pengawet Kayu Lapis Terhadap Rayap Kayu Kering ( Crypfqlermes Cynocephalus )
Abstrak: untuk industri perkayuan guna meningkatkan nilai hutan merupakan usaha yang harns segera dilakukan. Dalam rangka memaksimalkan itu banyak usaha yang dilakukan, anta..-ll lain dengan memproduksi kayu lapis. Kayu lapis ada1ah salah satu produk panel-panel kayu, berbentuk. semacam papan yang terdiri dari sejumlah lembaran tipis yang disebut finir. Finir-finir tersebut disatukan di bawah tekanan dan suhu yang tinggi oleh perekat yang sangat kuat. sehingga menghasilkan lembaran-Iembaran papan yang lebih mulus dan kuat (Rosa, 1994 ). Sejalan dengan laju pembangunan maka kebutuhan akan kayu lapis semakin meningkat. Usaha untuk memenuhi berbagai keperluan selama ini cenderung dilakukan dengan memanfaatkan kayu-kayu yang mempunyai kelas 8wet linggi ( kelas I - n ), padahal ketersediannya di alarn sangat terbatas ( 15 - 20% ). Maka dilakukan upaya menggunakan kayu kelas awet rendah, sayangnya ketidakawetan kayu serta ditarnbah dengan kondisi itdim tropika yang sangat mendukung kehidupan organisme biologis perusak kayu termasuk rayap khususnya rayap kayu kering Cryptotennes cynocephalus, menyebabkan umur pakai kayu menjadi sa.ngat singkat sehingga menimbulkan kerugian ekonomi yang sangat besar, karenanya perlakuan pengawetan merupakan alternatif untuk mengatasi serangan rayap kayu kering pada kayu lapis.
Keyword: 

Judul: Efektivitas chlorpyfos sebagai bahan pengawet kayu lapis
Abstrak: Dalam memaksimalkan penggunaan kayu banyak dilakukan berbagai upaya pengolahan kayu, salah satu cara adalah dengan memproduksi kayu lapis. Kayu lapis dalam peng- gunaannya seringkali mengalami kerusakan akibat serangan berbagai jenis organisme perusak kayu seperti kumbang, ra- yap, dan jamur. Hal ini disebabkan sebagian besar kayu lapis terbuat atas kayu yang kurang awet. Untuk me- ningkatkan keawetan dan umur pakai kayu lapis perlu dila- kukan tindakan pengawetan yang tepat guna. Salah satu cara pengawetan kayu lapis adalah dengan mencampurkan bahan pengawet kayu ke dalam perekat kayu lapis. Chlorpyrifos merupakan salah satu jenis bahan aktif insektisida yang termasuk golongan pospat organik, yang telah banyak digunakan untuk mengendalikan beberapa jenis serangga perusak kayu di berbagai negara, termasuk Indone- sia. Namun demikian keandalannya sebagai bahan pengawet kayu lapis belum banyak dilaporkan. Sehubungan dengan itu suatu penelitian telah dilakukan untuk mengetahui efikasi Chlorpyrifos yang ditambahkan pada garis perekatan ter- hadap rayap kayu kering dan mengetahui pengaruh dosis Chlorpyrifos tersebut terhadap sifat fisik lapis yang dibuat. mekanis kayu ...
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