Judul: Penentuan Daya Dukung untuk Kegiatan Keramba Ikan Hias di Situ Cilala, Kabupaten Bogor, Jawa Barat
Abstrak: The aim of research was to determine the carrying capacity of Cilala Lake where located in Bogor, West Java, for cage aquaculture of ornamental fish and wild fish in beyond of cage. The research was conducted from March to May 2013. The study of carrying capacity was done based on the load of phosphates entering the waters due to the activities of cages which is supported by several water quality parameters, such as nitrate, phosphate, chlorophyll, DO, temperature, and pH. The condition of Cilala Lake is good for fisheries activities. Types of fish that are kept in cages is a goldfish with the maintenance for 5 months (age 1-6 months), with a yield of 24 kg/cages. The fish was feed the worms and pellets with each FCR 15.7 and 2.5. Phosphate deposits of the pellets is 1.50%, whereas the worm is 0.11%. Results of analysis show that the number of goldfish can be produced is 140 ton/years with the additional number of cages as much as 600 cages for two periode maintenances. The number of wild fish in beyond of cages are 19.040 individues or about 4,28 tons/year.
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Judul: Kajian Status Trofik Dan Daya Dukung Perairan bagi Kegiatan Karamba Jaring Apung Di Waduk Saguling Jawa Barat
Abstrak: Saguling Reservoir as multipurpose reservoir have many problem, one of that is organic matter loading with two sources. Internal source of organic matter loading is floating cage aquaculture. The Purpose of this study was to estimate status trophic and carrying capacity for floating cage aquaculture in Waduk Saguling. Most of floating cage cultivated cat fish (Pangasius sp) with artifical feed which contain 1,19% of phospat. Several of water quality parameter exceed quality standar, that means there has been contamination of organic material in the Saguling reservoir. Dissolved Oxygen content can reached lower than 1 mg/l on inlet reservoir, dissolved oxygen content can not support the growth of aquatic organisms in maximal condition. Based of trophic classification using TRIX method, the productivity of the Saguling Reservoir has reached eutrophic level. Estimating water carrying capacity use phosporus budget model was found that total acceptable production to be 12.460 tons/year. Keywords : Trophic Status, Carrying Capacity, Saguling Reservoir, Floating Cage Aquaculture Based on interview data, fish production in Saguling is 2,76 tons / year / cage. The result is show that amount of cage which safe for water is 4514 cage units. Current Amount of active floating cage is 7209 units. This amount of present floating cage has exceed the maximum value of carrying capacity so that need to effective policy to manage floating cage activity.
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Judul: Konstruksi Persamaan Friedmann Alam Semesta Friedmann-Lemaitre-Robertson-Walker Termodifikasi Materi Gelap Superfluida
Abstrak: Kosmologi merupakan salah satu objek kajian dari teori relativitas umum. Salah satu model dalam kosmologi adalah model kosmologi Friedmann. Model kosmologi Friedmann dibangun berdasarkan asumsi bahwa materi dan energi terdistribusi secara homogen dan isotropik di alam semesta. Teori relativitas umum dapat dimodifikasi melalui pendekatan teori materi gelap superfluida (MGS). Persamaan medan Einstein untuk teori MGS dapat dirumuskan melalui prinsip aksi dengan memodifikasi Lagrangian pada aksi teori MGS. Selanjutnya dengan memilih metrik Friedmann-Lemaitre-Robertson-Walker (FLRW) datar dengan indeks kurvatur sama dengan nol, dapat dibangun suatu bentuk persamaan Friedmann yang dimodifikasi teori MGS.
Keyword: kosmologi, teori materi gelap superfluida, persamaan medan Einstein, metrik FLRW, persamaan Friedmann.