Judul: Evaluation of Coastal Area Suitability for Groupers (Family Serranidae) Mariculture Development in Pongok Island, Bangka Selatan Regency
Abstrak: The suitability of areas for groupers (Family Serranidae) mariculture with the floating net cage (FCG) system in the waters of the Pongok Island of Bangka Selatan Regency is based on biotechnics aspect or environmental parameters. The commodities that can be cultured are groupers namely of Polkadot cod (Plectropomus areolatus), Flowery cod (Epinephelus fuscoguttatus), Mud grouper (Epinephelus suillus), and Queensland grouper (Ephinephelus lanceolatus), and Barramundi cod (Cromileptes altivelis). The suitable area for groupers mariculture with FCG system is approximately 3,474.66 ha. The carrying capacity of Pongok Island waters with 3,474.66 ha area suitable for groupers with FCG system is as many as 1,670 community groups of FCG, equivalent to 16,700 FCG units or a maximum can support as many as 16,700 head of the family or the equivalent of 66,800 FCG holes. The calculation on mariculture with the FCG system for groupers (Famili Serranidae) based on economic analysis of R/C, PP, BEP, NPV, Net B/C, and IRR as feasible to be developed and can be an alternative livelihood for local community. The strategies of groupers mariculture management need to be taken are determine and arrange the location of culture, the implementation of the model of community groups, infrastructure development, the establishment of institutional systems, and government policy related to grouper area of culture.
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Judul: Evaluation of Coastal Area Suitability for Groupers (Family Serranidae) Mariculture Development in Pongok Island, Bangka Selatan Regency
Abstrak: The suitability of areas for groupers (Family Serranidae) mariculture with the floating net cage (FCG) system in the waters of the Pongok Island of Bangka Selatan Regency is based on biotechnics aspect or environmental parameters. The commodities that can be cultured are groupers namely of Polkadot cod (Plectropomus areolatus), Flowery cod (Epinephelus fuscoguttatus), Mud grouper (Epinephelus suillus), and Queensland grouper (Ephinephelus lanceolatus), and Barramundi cod (Cromileptes altivelis). The suitable area for groupers mariculture with FCG system is approximately 3,474.66 ha. The carrying capacity of Pongok Island waters with 3,474.66 ha area suitable for groupers with FCG system is as many as 1,670 community groups of FCG, equivalent to 16,700 FCG units or a maximum can support as many as 16,700 head of the family or the equivalent of 66,800 FCG holes. The calculation on mariculture with the FCG system for groupers (Famili Serranidae) based on economic analysis of R/C, PP, BEP, NPV, Net B/C, and IRR as feasible to be developed and can be an alternative livelihood for local community. The strategies of groupers mariculture management need to be taken are determine and arrange the location of culture, the implementation of the model of community groups, infrastructure development, the establishment of institutional systems, and government policy related to grouper area of culture.
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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