Judul: An Analysis of Resource Optimization in the Development of Aquaculture in Levun Bay Area, Southeast Maluku Regency.
Abstrak: This study aimed to analyze the suitability of Levun Bay area, for mariculture to determine the optimal resources used, to analyze business feasibility, and to analyze the policy of the priority in developing aquaculture commodity. The research result showed that suitability classification of the bay area for grouper fish culture belonged to a suitable class with a value of 57.1, and the seaweed culture was considered as a very suitable class with a value of 67.2. Based on supporting capacity consideration, the optimum area of cultivation for grouper fish was 150.42 ha and for seaweed was 254.00 ha. The business feasibility analysis of kerapu fish and seaweed cultivation revealed that both businesses are feasible to be developed because the NPV, Net B/C and IRR met the feasibility criteria. The policy analysis of commodity development priority based on the result of AHP indicate that the seaweed aquaculture value of 0.598 and the grouper aquaculture of 0.402, therefore seaweed aquaculture should be given priority to be developed.
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Judul: Analysis of mini purse seine Fishery Development based on Opt imization of Small Pelagic Resources In North Maluku Province
Abstrak: The small pelagic in North Maluku is highly potential, but the utilization has been not optimum due to low productivity of mini purse seine fishery. The objectives of the research are: 1) to determine relationship between production factors and mini purse seine fishing unit production; 2) to determine optimum mini purse seine fishing unit for maximum production and economic profit level in the utilization of small pelagic resources; and 3) to determine feasibility of mini purse seine fishery in North Maluku. Survey and observation methods were used in this research. Multiple regression analysis to analyze relationship between production factors with catch of fishing unit mini purse seine, production surplus method used on fish resources stock estimation, Gordon Schaefer model to analyze fishing bio-economic condition and financial analysis to analyze business revenue and feasibility. The result from multiple regression analysis showed the technical production factors that have significant effect to the fish production are number of labor, number of fishing days, mini purse seine height and mini purse seine length, otherwise factors that have not significant effect is boat size. The result from bio-economic analysis showed that exertion level of small pelagic resources using mini purse seine is almost optimum (MEY). The optimum catch for small pelagic is 20.781,87 tons per year with the optimum effort of 36.975 trips per year or equivalent with 205 mini purse seine units. Business and financial analysis of small pelagic fishing using mini purse seine showed BEP for production value per year of Rp 68.837.032,- and production volume per year of 28,89 tons. Value of NPV is Rp 453.157.157,- with IRR value of 47.23% and Net B/C value of 2.19 (more than 1), therefore mini purse seine in North Maluku is feasible to be developed.
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Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa