Judul: Pengaruh tingkat pemberian kotoran sapi terhadap pertumbuhan biomassa cacing sutra (tubificidae)
Abstrak: The supply of tubifex worm captured from the nature which is usually used in fish hatchery is still insufficient since its demand is constantly growing. Therefore, tubifex worm culture is of importance to meet that demand. The different in biomass between initial and final culture of tubifex worm will consecutively need feed to sustain the growth. The aim of this research was to investigate the influence of cow dung addition to the growth rate of tubifex worm biomass. The worms used were dominantly from Tubificidae family. The feed was a mixture between cow dung and the sand (D < 1) with weight ratio of 3 : 1. The addition of cow dung (referred as feed) was carried out on a certain interval day until the total amount added into the system was 25.2 kg/m2. System of fluid flow used within this research was fluid-flow-through system with debit of discharge was 132 ml/min. As the result, the different amount of cow dung addition into the system (constant; 2-4 fold from intial weight) was found to be insignificantly different (P>0.05) to affect the growth rate of biomass at the end of culture. However, the sustained feed during the culture would conclusively affect the growth rate of tubifex worm biomass.
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Judul: Produktivitas Budidaya Cacing Sutra (Oligochaeta) dalam Sistem Resirkulasi Menggunakan Jenis Substrat dan Sumber Air yang Berbeda
Abstrak: Tubificid worm have been used as live food which is important for ornamental fish production as well as other fish hatchery. This is because it has high protein content up to 52,49%. Many research have been done regarding tubificid culture, the result however still lower than that of natural production. The aim of this research was to increase productivity of tubificid worm in a recirculation system by using different types of substrate and source of water. This researching consisted of 4 treatments, i.e. ground water with sand substrate (SP), ground water with mud substrate (SL), catfish culture effluent with sand (LP), and catfish culture effluent with mud (LL). The research was done from May to August 2011 at Cibanteng, Laboratory of Fish Environment, and Laboratory of Fish Nutrition. Cultivation media was made by mixing the substrate and fermented chicken manure at ratio 1:1 , which drown in 2 cm height of water level. After 10 days drown the worm was stocked at 69 gram/m2. Culture period occurred was 60 days with addition of manure every 15 days. Biomass sampling was done every 15 days. The result of this research showed that biomass of worm cultured in LP medium is higher than in SP, SL, and LL, whereas in LL is the lowest biomass. Biomass growth of the worm in all treatment was significant at day 45th and 60th , where as the highest biomass (89,56 gram/m2) reached at day 45th on LP treatment.
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Judul: Analisis dan Implementasi Algoritme Voronoi Based Spatial Skyline untuk Pemilihan Lokasi pada Google Maps
Abstrak: Sistem pemilihan lokasi menjadi layanan yang dibutuhkan karena kebutuhan manusia yang semakin kompleks. Google Maps merupakan salah satu sistem pemilihan lokasi yang populer dengan salah satu fiturnya, yaitu pencarian lokasi menggunakan nearby. Penggunaan fitur nearby ini hanya mempertimbangkan satu lokasi saja, sehingga tidak dapat mengatasi kueri pemilihan lokasi jika ada lebih dari satu aspek nearby yang dipertimbangkan. Salah satu metode untuk menjawab permasalahan ini adalah Spatial Skyline Query (SSQ). SSQ adalah metode pemilihan lokasi berdasarkan konsep skyline query. SSQ melakukan pemilihan lokasi berdasarkan beberapa lokasi lain yang dipertimbangkan dengan memanfaatkan properti geometri dalam penyelesaiannya. Saat ini, SSQ belum diterapkan dalam Google Maps. Penelitian ini menggunakan salah satu algoritme SSQ yang efisien yaitu Voronoi-based Spatial Skyline (VS2) untuk pemilihan lokasi pada Google Maps. Hasil dari penelitian ini adalah sistem pemilihan lokasi berbasis web.
Keyword: Google Maps, pemilihan lokasi, skyline query, spatial skyline query, voronoi-based spatial skyline