Judul: Produktivitas Budidaya Ikan Diskus Symphysodon sp. Pada Rasio Media-Ikan 2 hingga 5 Liter per Ekor
Abstrak: Increasing density will be followed by increasing production if it has a good environment and feed accomplished. The purpose of this experiment was to determine the optimal discus fish Symphysodon sp. production in term of growth, survival rate, feed efficiency and economic aspect. The design of the experiment was randomized complete design with 4 treatments and 3 replications. The discus seeds at average lenght of 2.60 + 0.01 cm and of weight 1.36 + 0.01 g were reared at volume of 60 liters. Tubificide feed was given twice a day at satiation level. 50% of the media in the aquarium was replaced with fresh water daily. The result showed that lowering media-fish ratio affected the weight and the growth, but did not affect the survival rate, the feed efficiency value and the length variety coefficient. Based on economic analyze, the highest gain was achieved by the media-fish ratio of 3 L/fish.
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Judul: Kajian biologi reproduksi ikan diskus
Abstrak: Penelitian dilakukan di Laboratorium Pengembangbiakan dan Genetika Ikan, Kolam Percobaan Babakan, Jurusan Budi- daya Perairan Fakultas Perikanan IPB; mulai bulan Maret sampai Juli 1995. Penelitian ini bertujuan untuk mengetahui tingkah laku pemijahan, frekuensi pemijahan, selang waktu antar pemijahan, fekunditas, jumlah telur yang diovulasikan, serta daya tetas telur. Ikan diskus yang digunakan dalam percobaan ini adalah strain Blue Turquoise sebanyak 7 pasang dan berumur sekitar 15 bulan. Ikan yang digunakan belum pernah memijah sebelumnya. Makanan yang diberikan kepada induk ikan diskus adalah cuk merah sebanyak 2 kali sehari, pagi dan sore hari. Induk dipelihara secara massal dalam akuarium berukuran 100x50x40 cm³ hingga memasang. Pasangan induk dipelihara dalam akuarium terpisah yang berukuran 60x50x40 cm³. Substrat pemijahan yang digunakan adalah sebuah pipa paralon. Telur hasil pemijahan diinkubasikan dalam akuarium berukuran 30x30x30 cm³ serta ditambahkan larutan methylen blue sebanyak 2 ppm. ..
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Judul: Pengembangan Sistem Rotasi Peta pada Perangkat Mobile tanpa Sensor Magnetometer
Abstrak: Due to the improvement of technology, the function of mobile phone has changed a lot. Nowadays, mobile phone is used not only for communication, but also to support the user’s activity. Many mobile phones now have Operating System (OS) and sensors like GPS and magnetometer. GPS is a sensor that can be used to identify any location, including the location of the user, while magnetometer can be used to identify direction. With data that come from GPS and magnetometer, we can build a navigation application that can rotate its map according to the rotation of the user. Meanwhile, in the Android Compability Definition Document point 1.6 until 2.2, Google have requirements for mobile phones to have GPS and magnetometer sensors if they want to use Android OS. But, since the release of 2.3.3 OS, Google has changed its requirements, allowing any mobile phones to have Android OS without having the magnetometer sensor. The objective of this research is to build an navigation application that can rotate without using magnetometer sensor. The value of the rotation degree is taken from last two position. To stabilize the value, Exponential Smoothing is used in filtering process. This system also use Haversine method to recognize whether the user is walking or driving/riding.
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