Judul: Study of Silvofishery Application for Mangrove Ecosystem Rehabilitation in Dabong Village Kubu District Kubu Raya Regency, Province of West Kalimantan
Abstrak: Rehabilitation of the damage mangrove ecosystem was caused by land clearing ponds was should be our common concern, local governments should be able to persuade communities to not destroy mangrove forests. It can be done by invite the communities, especially the shrimp farmers to participate in rehabilitation of mangrove ecosystems through silvofishery system application. The study aims to: analysis for the application of bioengineering silvofishery based on condition of existing ponds. analysis of the perception of farmers and stakeholders. institutional analysis for the application of silvofishery system, economic and financial analysis for the silvofishery application. Data were collected through observation, interviews, discussions and questionnaires. The results showed that the revitalization of the pond with application of silvofishery system is very appropriate, because the construction of existing fish ponds have appropriated for the silvofishery application by empang parit tradisional model. This model could be achieved with the rehabilitation of 444.28 hectares mangrove area. All stakeholders have had better perception and agreed to preserve mangrove ecosystem and implement silvofishery system. Implementation of silvofishery system would be feasible to be implemented with the NPV= 61.413.353,86 (rupiah), Net value of B/C = 4,16; and the value of IRR= 92,67(%).Implementation silvofishery system will improve institutional performance, as it will fix the source of interdependence and institutional structures. Application systems can silvofishery systems can conducted among others by the way: a) promptly formed organizations Protected Forest Management Unit (KPHL) as an area manager, b) KPHL immediately implement forest governance activities include delineating activities and forest inventory, and c) KPHL will grant permission in the form of Utilization License Area (IUPK) for fishpond silvofishery system. this is to show the transfer of property righ as well as responsibility to the farmers.
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Judul: Pengelolaan Ekosistem Mangrove Berbasis Minawana (Studi Kasus: Kawasan Mangrove RPH Tegal-Tangkil KPH Purwakarta, Blanakan Subang Jawa Barat).
Abstrak: Mangrove ecosystem management based on silvofishery has been already known and practiced widely, both in Indonesia and abroad. However, today it’s difficult to find silvofishery application that comply the right principles, even on biotechnical, ecologies, and institutions aspect. The aims of this research were: 1) to know ecology status, biotechnical, and economics of silvofishery system at RPH Tegal-Tangkil; 2) to formulate silvofishery management at RPH Tengal-Tangkil, Blanakan, Subang. The data were collected related to ecology, economic, and social-institution aspect. Results of this research were: 1) mangrove ecosystem has given significant contribution on shrimp catches; 2) water quality condition still suitable for fish aquaculture activities, even though there was indication of heavy metal content, so that need to improve tendon system for better water quality; 3) as biotechnical, many of the farmers still use traditional aquaculture and not implement good standards and aquaculture principles. 4) as economics, silvofishery system still can be developed to increase peoples income. Good silvofishery application can increase peoples income up to 509. 60%; 5) institute management of silvofishery was still deficient. It’s showed from fact condition in the field. Improvement the silvofishery management must be focus on organization system and rules of the game.
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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