Judul: Uji Performansi Getaran Mekanis dan Kebisingan Mist Blower Yanmar MK 150-B
Abstrak: Mist blower is one of the mechanization tool of agriculture considered as a tool that can assist humans in fertilizer and pesticides spreading activities. Levels of motor speed in the used mist blower were 1915, 4009, and 7227 rpm. Vibration measurements were conducted on the engine and handlebar control mist blower with the three-dimensional axes namely X, Y, and Z. Mist blower noise measurements were performed on the engine, operator's right ear and left ear. Based on the analysis of vibration and noise from the mist blower of type MK 150-B was obtained the safe limit values from the use of these tools. The safe limit of the use of mist blower in motor rotation speed of 1915, 4009, and 7227 rpm after being compared with the vibration and noise were 1 hour, 1 hour and 24 minutes respectively. The farther the distance from noise source, the lower the noise level too. Moreover objectivity study of operator was conducted. The first farmer was tired faster than the second farmer. In terms of age of farmer, the second farmer (60 years) older than the first farmers (40 years), but this should not affect significantly. Activity on the previous day greatly affects the level of fatigue when operating the mist blower. This was because the first farmers did more activities and had rest periods that less than second farmer.
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Judul: Performance of Mist Blower for Liquid Organic Fertilizer and Biosaka
Abstrak: Pupuk organik cair dan biosaka merupakan salah satu cara untuk memenuhi kandungan nutrisi serta pencegahan hama pada tanaman. Pengaplikasian pupuk organik cair dan biosaka dapat menggunakan alat dan mesin pertanian yaitu pengabut gendong bermotor (mist blower). Mist blower merupakan salah satu tipe sprayer yang dapat memecah cairan untuk menghasilkan butiran halus (droplet) yang dihembuskan oleh aliran udara dari blower yang digerakkan oleh motor penggerak. Pengujian kinerja mist blower dilaksanakan di laboratorium sprayer. Terdapat enam perlakuan kombinasi dari tiga jumlah baling-baling nosel (balingbaling nosel berjumlah 8, baling-baling nosel berjumlah 10, dan baling-baling nosel berjumlah 12) dan dua jenis larutan (pupuk organik cair dan biosaka). Hasil uji kinerja pengabutan optimum diperoleh pada baling-baling nosel berjumlah 12 menggunakan larutan pupuk organik cair dan biosaka, mampu menghasilkan diameter droplet sebesar 159,6 μm dan 221,4 μm, kerapatan droplet sebesar 308,4 droplet/cm2 dan 190,4 droplet/cm2 , lebar pengabutan efektif sebesar 128 cm, debit pengabutan efektif sebesar 1,43 liter/menit dan 1,46 liter/menit, jangkauan pengabutan efektif sebesar 1,12 m dan 1,04 m, dan jangkauan pengabutan total sebesar 6,56 m dan 6,32 m. Kinerja mist blower dengan jumlah baling-baling nosel yang lebih banyak mampu menghasilkan diameter droplet yang semakin kecil dan kerapatan droplet akan semakin besar.
Keyword: biosaka, liquid fertilizer, mist blower, nozzle propeller

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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