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 Perfomance and Feasibility of Ornamental Fish Corydoras paleatus Size One Centimeter of Different Stocking Density with Water Exchange 30%
Abstrak: Kebutuhan ikan koridoras semakin meningkat seiring dengan pertumbuhan penduduk dan permintaan. Dewasa ini ikan koridoras yang banyak diminati masyarakat adalah jenis Corydoras paleatus. Ikan ini sudah banyak dibudidayakan di Indonesia namun produktivitasnya masih rendah. Penelitian ini bertujuan menentukan padat tebar yang optimal dalam budidaya ikan Corydoras paleatus dengan pergantian air 30% setiap hari. Penelitian ini menggunakan rancangan acak lengkap dengan 4 perlakuan dan 3 ulangan. Perlakuan tersebut berupa padat tebar 500 ekor m-2, 1000 ekor m-2, 1500 ekor m-2, 2000 ekor m-2 yang diisi air sebanyak 30 L. Pemeliharaan ikan dilakukan dalam akuarium berukuran 50 cm × 30 cm × 25 cm selama 28 hari dengan pemberian pakan cacing sutra dilakukan pada jam 08.00 dan 16.00 WIB. Hasil penelitian menunjukkan bahwa perlakuan padat tebar berpengaruh nyata terhadap parameter tingkat kelangsungan hidup, laju pertumbuhan spesifik, laju pertumbuhan harian, pertumbuhan panjang mutlak, dan efisiensi pakan, namun tidak berpengaruh nyata terhadap parameter koefisien keragaman panjang. Padat tebar yangmenghasilkan kinerja produksi dan kelayakan usaha terbaik adalah 2000 ekor m-2., The need for Corydoras fish is increasing in line with population growth and demand. Currently the fish that is in great demand is Corydoras paleatus. This type of fish has been widely cultivated in Indonesia but its productivity is still low. This study aimed to determine the optimal stocking density in the cultivation of Corydoras paleatus with 30% water change every day. The study used a completely randomized design with 4 treatments and 3 replications. The treatments were stocking density, namely 500 m-2, 1000 m-2, 1500 m-2, and 2000 m-2. Fish rearing was carried out in 12 aquariums measuring 50 cm × 30 cm × 25 cm each and filled with 30 L of water. During the maintenance period, the fish fed Tubifex sp. done at 08.00 and 16.00 WIB and water changes by 30% daily. The results showed that the treatment of stocking density had a significant effect on survival, specific growth rate, daily growth rate, absolute length growth, and feed efficiency parameters, but did not have a significant effect on length variability coefficient. The stocking density that resulted in the best production performance and business feasibilty was 2000 m-2. Keywords: corydoras
Keyword: corydoras, production performance, stocking density, corydoras, production performance, 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.
Keyword: