Judul: Bioecology and population dynamic as a basis in the management of pokea (Batissa violacea var. celebensis von Martens, 1897) exploited in Pohara River Southeast Sulawesi
Abstrak: Poke a population in Pohara River is decreasing in terms of specifically its stock ability to recover due to increasing exploitation and declinign of habitat / environment quality. The aims of this research are to study the spatial and temporal density, growth potencials (somatic and reproductive), and the exploitation level and stock ability to recover as basis/ground in the freshwater clam (pokea) management.
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Judul: Pengelolaan Sumber Daya Cumi-Cumi (Loligo sp Hegner dan Engemann 1968) di Pelabuhan Perikanan Nusantara (PPN) Karangantu, Kabupaten Serang, Provinsi Banten
Abstrak: The main purpose of this research is to estimate the Exploitation Rate and Mortality Rate of squid, the Maximum Sustainable Yield (MSY), the Maximum Economic Yield (MEY), Open Access Yield (OA), and to make the management plan. The methods used in this research are method Production Surplus and Bio-Economy Analysis. Data used in this research are primary data which consists of the data of length and weight of squids, and operational cost of fishing, and secondary data which consists of amount of fish product, and the fishing effort which are taken from PPN Karangantu. The result of the research showed that based on the length of squid (Loligo sp) which catched around the Banten Bay, and which landed to Karangantu National Fishing Harbor (PPN) have been occurred overfishing. This matter can be seen by the result of Exploitation Rate (0.7545) that reached over the optimum exploitation rate. This overfishing caused by fishing mortality that more than natural mortality. This matter can also be seen by the amount of fish product, and the fishing effort in PPN Karangantu that squid (Loligo sp) has been occurred an overfishing by the bio-economic point of view because of the actual data result of effort value has got the more rate result than MSY and MEY effort rate, so the fishing result has decreased and the profit is not optimum.
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik.
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik