Judul: Estimasi nilai ekonomi lingkungan perkebunan kelapa sawit ditinjau dari neraca air tanaman kelapa sawit: studi kasus perkebunan kelapa sawit di Kecamatan Dayun Kabupaten Siak Propinsi Riau
Abstrak: Dayun is one of the center of oil palm plantations in Siak. Government company that develops the oil palm plantation in Dayun is PT. Perkebunan Nusantara Lima (PTPN V) and also the first company which develops the oil palm in Siak. The oil palm plantations cause various effects to the environment; one of them is the decreasing of water availability that can be used by the water stakeholders. The decreasing of water availability causes additional cost to the community. The objectives of this study are to determine the decreasing of water because of the oil palm plantation and cost that spent to meet the needs of water. The study uses water balance model by Thornwhite 1957 and Willingness to Pays (WTP) analysis using questionnaire of Contingent Valuation Method (CVM) in Sawit Permai, Dayun, Siak.The land cover, before and after, affect the water balance which impact the water availability in Dayun. The decreasing of water availability is comparable with the increasing of water demand in oil palm plantation, equal to 67 mm/year. Oil palm plantation has greater runoff than forest. The need of water in oil palm plantation in Dayun is 42.728 liters /ha /day, with the need of a single palm tree equal to 0,012 m3/s/day. Based on the analysis of debt estimation, there is debt decreasing which indicates the decreasing of water availability in Dayun, around 349 m3/s/year. The estimated value of the environment for oil palm plantations by water resources consumption based on the difference of forest and oil palm plantations during the dry season (JJA) is equal to Rp 7.500.000.. Average WTP for the water conservation program is Rp 26.400, with WTP maximum and minimum up to Rp 45.000 and Rp 5.000 respectively. The economic value of water conservation program is Rp 18.850.000/month.
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Judul: Dampak Ekonomi Pengelolaan High Conservation Value Areas (HCVA) di Perkebunan Kelapa Sawit (Studi Kasus PT. Inti Indosawit Subur Kebun Buatan, Provinsi Riau)
Abstrak: The global demand for palm oil was growing rapidly. Palm oil was consumed world wide and constituted the vegetable oil with the highest level of market penetration. Indonesia was the largest producer of palm oil in the world while Malaysia was the leading exporter of palm oil, accounting for 46% of global exports. The production of palm oil was associated with many sustainability issues, including deforestation, erosion of biodiversity and violation of social rights. The Roundtable on Sustainable Palm Oil (RSPO) as the concern these issues of European driven initiative of the World Wide Fund for Nature (WWF). The palm oil estate was rarely focused on the cost and benefit analysis in calculating the economic valuation and financial projection on High Concervation Value Area (HCVA) as the prerequirement of RSPO certification. This research was done to analyze the economic impact of HCVA management in palm oil estate. The research spent for three month in PT IIS (Riau). The method was used; The Total Economic Value (TEV) analysis, the cost benefit analysis, the financial and economic analysis, and the stakeholder analysis on managing HCVA. Based on this calculation, the amount of TEV showed Rp 1.321.847.970,00 per year for PT IIS Kebun Buatan. There were three scenarios used; with HCVA, (NPV: Rp 655.616.430.602,00), with HCVA+0.35% (NPV: Rp 664.005.845.480,00) and without HCVA (NPV : Rp 667.346.030.004,00). Premium price for 0.35% was not feasible for the palm oil Industry. The stakeholder analysis showed the palm oil industry, GAPKI and Sawit Watch as the key players for the HCVA management.
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Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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