Judul: Desain Bangunan Turbin Picohidro dengan Tenaga Air Irigasi
Abstrak: Jaringan irigasi memiliki potensi sebagai pembangkit listrik tanpa emisi karbon. Penelitian ini bertujuan mendesain bangunan turbin pikohidro dengan tenaga air irigasi. Desain bangunan turbin pikohidro tenaga air irigasi telah dapat didesain dengan turbin reaksi kaplan yang terdiri dari desain turbin tunggal dengan daya 24,5 kWh/hari dan desain multi turbin dengan daya 122,75 kWh/hari. Kecepatan aliran irigasi berkisar antara 0,4 m/s – 0,74 m/s dengan potensi daya 1,4 kWh – 655,1 kWh. Hasil simulasi menunjukan tipe Kaplan adalah turbin terbaik yang dapat digunakan pada desain bangunan turbin pikohidro tenaga irigasi. Pada kondisi debit inlet 18 l/s dan ketinggian terjun 0,5 m bangunan turbin pikohidro menghasilkan putaran poros turbin sebesar 106 rpm, tegangan 15,6 volt dan arus 1,1 ampere. Bangunan turbin pikohidro sebaiknya dipertimbangkan sebagai bagian dari bangunan terjun aliran irigasi untuk meredam energi.
Keyword: Irrigation Networks, Pico hydro, Turbine, Power

Judul: Potensi Pemanfaatan Curah Hujan sebagai Sumberdaya Pembangkit Listrik Nanohidro
Abstrak: Water resources are be an source energy alternative that are widely used by many developing countries and developed countries as the main source of national energy. Generally, a power plant that uses water resources requires a large flow of the river or through the dam energy to generate electricity, but the applying of precipitation potencial is not widely done. Nanohydro power plants developed in this study utilizes precipitation that falls onto the surface of building. This tool has a small size and can be moved around (portable/moveable) with simple system to facilitate its use. Due to large precipitation changing over time, then the utilization of rainfall is conditioned prior to reaching the minimum required discharge limits to rotate and maintain the turbine rotation. Minimum flow required to rotate and maintain the turbine is about 4-5 liters per second. Nanohydro power plants have an efficiency of 5,23% with a tool for value and efficiency of the turbine generator efficiency of 40,96% and 12,76%. Turbine of the power plant can be spun at a speed of 60 rpm with 0.4 height and flow rate of 5 liters per second. With the rotational speed of the turbine, nanohydro power generation can produce power about 2 watt and can turn on the 3 watt LED lamp with a light level of ignition criteria.
Keyword: Bogor Agricultural University (IPB), efficiency, nanohydro, rainfall, power generation, alternative energy

Judul: Mud Crab’s (Scylla serrata Forskal 1775) Response to Different Decaying Level of Gold Snail (Pomacea canaliculata Lamarck 1822) Bait.
Abstrak: Mud crab is well known as omnivorous-vigorous-voracious-opportunistic-scavenger. These intertidal animals applies mainly chemoreception in their predatory behaviour. It has been commonly assumed that non fresh gold snail bait is better than fresh bait in stimulating the mud crab. This research's aim is to analyze mud crab response to different decaying level of gold snail bait. Their response were observed as time required to touch the bait and pattern and direction of the mud crab in approaching the baits. The different decaying level of gold snail baits were shown on Total Volatile Base Nitrogen (TVBN) as 16.3 mg/100g (0 day); 534.1 mg/100g (3 days); and 887.4 mg/100g (6 days). The research was conducted from July 2009 until February 2011. The TVBN test for gold snail baits were conducted at Laboratory of BBPPHP Jakarta. The experiment was conducted in Pemalang. The result showed that the average period of mud crabs to touch the baits were 52.14 minutes; 61.57 minutes and 52.57 minutes. Anova test concluded no sufficient evidence of significant effect of TVBN content of gold snail bait on mud crab’s feeding behaviour. Movement pattern B, i.e. left and right deviation followed by straight forward movement to the bait, was commonly exhibited by the crabs. Consequences of time period required by the mud crab to approach the bait on fishing operation is discussed.
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