Judul: Komposisi Jenis Mangrove dan Pengetahuan Masyarakat tentang Kawasan Mangrove, Desa Sayoang, Halmahera Selatan
Abstrak: The area of mangrove forests in Indonesia is currently only spanning as much as 3.4 milion acres, so there is a need for the participation of the government and community to maintain its sustainability. South Halmahera is the district with the largest mangrove area in the North Maluku province. One of the mangrove areas in the district of South Halmahera is located at Sayoang Village, East Bacan District. Up until its eleventh founding anniversary, this district have never conducted an inventorizing of its mangroves, both ecological and social studies in the field of public. This study aims to analyze the compotition of mangrove species in Sayoang Village, East Bacan District, South Halmahera, and identify the knowledge of surrounding communities of mangrove areas as protected areas. Data were retrieved using sampling method with applications terraced paths, and analyzed by calculating its important value index (INP) and its index value diversity (IVD). The public social data were taken using in-depth interviews and questionnaires. Results obtained from this study show that the mangrove forest in Sayoang village, East Bacan district, Halmahera, consists of major mangrove species with as many as eleven species belonging to families Rhizophoraceae, Sonneratiaceae, Aviceniaceae, Meliaceae and Myrtaceae, and as many as three species of minor mangrove belonging to families of Lorantaceae, Acanthaceae, and Pteridaceae. The mangrove's species diversity and richness is and low, but it has high evenness. 60% of total respondents know the benefit of mangrove as fish habitat, while for mangrove area as conserving areas, 50% of total respondent don't know the status of the area. The cutting problems happened in mangrove areas, 90% of total respondent know the activity and 85% of total respondent think that the logging activities in mangrove area is still allowed. The management activity of mangrove area in Sayoang village hasn't been conducted, either by the community or by local Dinas Kehutanan, and 53% of total respondent still wishing the mangrove can give more benefit economically.
Keyword: Bogor Agricultural University (IPB), community knowledge, mangrove protected areas, Mangrove forest

Judul: Study of Potential and Mangrove Ecosystem Management In South Jailolo District Of West Halmahera
Abstrak: Mangrove ecosystem in South Jailolo District has many functions for coastal area. This is a concern because the extent of mangrove ecosystems decreases from year to year due to the exploitation and conversion for various purposes without considering the ecological functions and physical function of mangrove ecosystems. This research aim to describe about potential and existing condition of mangrove ecosystem and also to give directive policy strategic for Management of mangrove ecosystem in this area. This study aims to determine the condition of mangrove ecosystems in the District of South Jailolo, assessing the potential ecological and economic impacts of mangrove ecosystems and how big a reduction in mangrove area over the past 17 years, and then set the strategy of sustainable management of mangrove ecosystems This research use primary and secondary data. Primer data gathering done by sampling, field observation, quistioner, and open interview ended and in depth interview in the research area. Secondary data gathering by unravel various literature, and related institution. Although the reduction in mangrove forest area is still in small quantities, to maintain the sustainability and ecological function it needs to management strategies. Results of analysis for management strategies found that is conservation to preserve the mangrove ecosystem area (34%), managing the mangrove ecosystem as ecotourism (32%), conservation of mangrove land as aquaculture area (21%) and make local regulations for the management of mangrove ecosystems (13%)
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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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