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: 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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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