Judul: Evaluasi Kelayakan Investasi Hutan Rakyat Jabon di Desa Brebeg Kecamatan Jeruklegi Kabupaten Cilacap
Abstrak: Jabon community forest in rural land of Brebeg, Jeruklegi, Cilacap is the first time for planting project accomplished. The development of this forest requires an investment feasibility evaluation to see if the business is feasible to be continued or requires more reviews. The evaluation consisted of nonfinancial and financial aspects. The nonfinancial evaluation’s result (technical aspect, market aspect, social aspect, and environment aspect) showed that jabon is more feasible to be developed than sengon and mahogany. The result of financial evaluation obtained NPV Rp19 517 832 in strata I; Rp26 494 773 in strata II; and Rp84 494 319 in strata III, obtained BCR 2.81 in strata I; 2.76 in strata II; and 4.09 in strata III, obtained IRR 43.14% in strata I; 42.59% in strata II; and 56.53% in strata III. As such, the community forest in rural land of Brebeg is feasible based on financial and nonfinancial aspects. In addition, the switching value analysis showed that neither output price decrease nor variable cost increase was not affected the business sensitivity.
Keyword: switching value, investment feasibility, jabon, community forest

Judul: Analisis Finansial Usaha Hutan Rakyat Jabon Pola Bagi Hasil di Unit Usaha Perhutanan Kebun Semeru Bogor
Abstrak: Wood utilization of private forest has a potential to fulfill the raw material demand of industry amid the decreasing of natural forest resources in Indonesia. One of scheme for development of private forest in Indonesia is partnership scheme. The purpose of this research is to determine the financial feasibility of partnership scheme with profit sharing mechanism in jabon (Anthocephalus cadamba Miq.) private forest management at Kebun Semeru Forestry Business Unit (UUP Kebun Semeru), Mitra Karsa Cooperative, Forestry Research and Development Agency that located in Leuwiliang District, Bogor Regency, West Java Province. Financial analysis using Discounted Cash Flow methods shows that the NPV is Rp 202.700.335, IRR is 31% and Net B/C is 1,37. It means that private forest management by UUP Kebun Semeru is financially feasible. Despite net profit that earned from this partnership scheme is less than net profit earned by self-capital or bank loan capital for private forest, this profit sharing scheme is one of profitable option in the situation of capital limitation or complex requirements to get loan from official financing sector such as bank.
Keyword: financial analysis, profit sharing scheme, private forest

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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