Judul: Pengaruh Persentase Pergantian Air Terhadap Kinerja Produksi  Ikan Koridoras Albino (Corydoras aeneus) di Ilmi Fish Farm,  Bogor
Abstrak: Ikan koridoras albino Corydoras aeneus merupakan salah satu komoditas ikan hias air tawar yang banyak diminati oleh para penggemar ikan hias. Produktivitas ikan ini tergolong masih rendah maka dari itu permintaan pasar yang tinggi belum dapat terpenuhi. Penelitian ini bertujuan menentukan produksi terbaik ikan koridoras albino pada sistem pergantian air dengan persentase pergantian 20%, 30% dan 40% dengan padat penebaran 1.000 ekor m-2 , dengan tiga ulangan. Ikan koridoras yang digunakan memiliki rata-rata 0,21±0,02 g dan panjang rata-rata 1,44±0,05 cm. Ikan diberi pakan Tubifex sp. dua kali sehari, pakan diberikan dengan metode at satiation, selama masa pemeliharaan 60 hari. Hasil penelitian menunjukkan bahwa produksi terbaik terdapat pada persentase pergantian air sebanyak 40%/hari dengan nilai kelangsungan hidup 93,73±0,42% dan laju pertumbuhan spesifik 4,55±0,14%. Berdasarkan perhitungan analisis usaha persentase pergantian air 40% menghasilkan keuntungan per siklus paling tinggi yaitu Rp85.180.064, The albino Corydoras catfish (Corydoras aeneus) is one of the popular freshwater ornamental fish commodities among fish enthusiasts. However, the productivity of this fish is still relatively low, and as a result, the high market demand cannot be fully met. This research aims to determine the best production for albino Corydoras catfish in a water exchange system with exchange percentages of 20%, 30%, and 40% at a stocking density of 1.000 individuals per square meter, with three replicates. Fish were stocked at initial weight of 0,21±0,02 g, and initial length of 1,44±0,05 cm. The fish fed Tubifex sp. twice daily at satiation for 60 days culture period. The results indicate that the best production was achieved with a 40% daily water exchange rate with survival rate of 93,73±0,42% and specific growth rate of 4,55±0,14%. Based on the business analysis, 40% water exchange treatment resulted in the highest profit per cycle, which was Rp85.180.064
Keyword: Corydoras aeneus, pergantian air

Judul: Production Corydoras aeneus Corydoras Albino Fish In Replacement Water 10%, 20%, and 30%
Abstrak: Ikan koridoras albino merupakan komoditas unggulan ekspor, tetapi produksinya masih tergolong rendah. Penelitian ini bertujuan untuk menentukan tingkat pergantian air yang memberikan produksi optimum. Benih ikan koridoras albino 1,92±0,11 cm dipelihara dalam akuarium dengan kepadatan 8 ekor/liter dengan pergantian air yang berbeda yaitu 10%, 20% dan 30%. Selama pemeliharaan ikan diberi pakan 3 kali sehari secara ad libitum dan kualitas air dikelola melalui penyifonan setiap hari. Hasil penelitian menunjukkan bahwa pergantian air tidak memengaruhi semua parameter penelitian kecuali kelangsungan hidup ikan. Kelangsungan hidup ikan paling tinggi dicapai pada perlakuan pergantian air 20%, akan tetapi laju pertumbuhan spesifik panjang, laju pertumbuhan spesifik bobot, pertumbuhan mutlak panjang, pertumbuhan mutlak bobot, koefisien keragaman dan konversi pakan tidak berbeda. Dengan demikian produktivitas paling optimal pendederan ikan koridoras albino dengan padat tebar 8 ekor/liter paling optimal dicapai pada perlakuan pergantian air 20%.
Keyword: Water exchanges, Corydoras albino, Corydoras aeneus, Survival, Water quality, Enlargement, Water chenges, Feed conversation, Stocking density

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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