Judul: Rancang Bangun Sistem Hidrolik pada Mekanisme Bongkar Muatan Transporter Trek Kayu
Abstrak: In previous research (Rudiansyah 2012), designed Fresh Fruit Bunch (FFB) transporter that using wooden track to reduce the load on the ground with low bearing capacity of soil condition or land that has a steep slope. Unloading mechanism in previous research use sliding mechanism. In sliding mechanism, bucket is pushed in order to reach the tipping point so it can be raised by an operator who is next to the bucket. In this research, FFB dumping mechanism designed using hydraulic power. The addition of the hydraulic components are expected to reduce the workload of the operator and able to improve the transport capacity of the transporter. Hydrolic design is performed by CAD software. The result of the design are actuator cylinder having a diameter of piston is 32 mm and piston rod diameter is 20 mm, length of stroke is 205 mm with total overall length is 594 mm. Hydraulic gear pumps with 11 cc capacity used to support the performance of the system. The functional part that support the main functions are frame, tub, stand pumps, direction control valves and flow reducing valve, and hydraulic tank. Performance test results showed that the recommended load is 340 kg. The time it takes actuator to lift the tub (extrusion) when empty is 1.41 seconds, but while there is a load in the tub it takes 2.35 seconds.
Keyword: directional control valve, dumping, hydraulic system, transporter, wooden track

Judul: Desain Transporter Tandan Buah Segar (TBS) Kelapa Sawit Tipe Trek Kayu
Abstrak: Harvesting activity are the important job is oil palm production. Harvesting activity of Fresh Fruit Bunch (FFB) consist of cutting, collection, and transportation. The main topic of this research wos to find alternative transporter for FFB transportation. The problem of FFB transportation from palm circle to collection point are low bearing capacity of soil condition, narrow evacuation line, and low transportation capacity. The design criteria on FBB transporter are defined as the transportation capacity is 500 – 600 Kg, the ground pressure is lower than 800 kPa, transporter wide to the soil smaller than 100 cm, the unloading process is done manually, and has a simple mechanism. The result of transporter design are the ground pressure is 34.35 kPa and transporter wide is 925 mm. The functional parts that was support the main function are chassis, bucket, bucket rail, gearbox, engine, crawler, and seat. Based on engineering analysis, the material used for the chassis and bucket rail is canal U S45C with dimension (100 x 50 x 5) mm. Based on engineering analysis, the seat framework material was using the steel pipe with the outside diameter is 50 mm and the thickness is 4 mm, the material used have σa 24 kg/mm2. The crawler refers to Setyawan (2005), the gearbox is using hand tractor Quick M1000 Alfa and the engine is Yanmar L70N. Based on RULA analysis, the simulation at some work position likes steering, and unloading having the final score 2, it is mean design acceptable.
Keyword: 

Judul: Psittacosis Sebagai Zoonosis Penting Yang Berasal Dari Burung
Abstrak: Psittacosis atau ornithosis adalah penyakit menular dari burung kepada manusia. Agens penyebab psittacosis termasuk ke dalam virus psittacosis-lymphogranuloma venereum group yang disebut Chlamydia psittaci. C. psittaci hanya dapat berkembang biak di dalam jaringan hidup tetapi peka terhadap antibiotik. Penyebaran penyakit ini sangat luas, terdapat hampir di seluruh dunia. Di Indonesia penyakit ini belum pernah di diagnosa, tetapi mengingat terdapat demikian banyaknya jenis burung maka diperkirakan psittacosis ini sudah ada. Kasus pada manusia pertamakali ditemukan oleh Ritter pada tahun 1879, di Eropa. Waktu itu dikenal sebagai pneumotyphus. Chlamydia psittaci tidak hanya sebagai penyebab infeksi pada burung, juga bisa menyebabkan infeksi pada mamalia diantaranya sapi, kerbau, kambing, domba, babi dan kucing. Pada kucing dikenal sebagai feline pneumonitis. Pada domba atau kambing mengakibatkan enzootic abortion. Pada burung, kalkun merupakan unggas paling rentan diikuti oleh burung psittacine dan burung lain di luar famili psittacidae. Virulensinyapun berbeda-beda. Yang berasal dari kalkun bervirulensi tinggi, sedangkan yang berasal dari burung merpati bisa bervirulensi tinggi bisa juga bervirulensi rendah. Penularan terjadi melalui kontak langsung maupun ti- dak langsung. Penularan melalui telur tidak terjadi. Umumnya penyakit ini memperlihatkan gejala klinis berupa deman, lesu, lemah, anorexia, kurus, diarrhea ber- warna kekuningan, discharge dari mata dan hidung, conjunc- tivitis. Gejala khas pada kalkun adalah istirahat dengan sternum sebagai dasarnya, karena adanya tekanan dari bagian perut yang sakit. Sedangkan pada manusia memperlihatkan adanya demam, kadang-kadang merasa dingin, lesu, sakit kepala yang hebat, sakit pada bagian belakang badan dan photophobia…dst
Keyword: