Judul: Analisa teknoekonomi pendirian industry biodiesel dari biji nyamplung (Calophyllum inophyllum L.)
Abstrak: World crises that occurred in the last decades caused the scarcity of fuel oil. During 2004 fuel oil consumption in Indonesia reached 26.9 billion liters, and in 2011 is estimated to reach more than 34.71 billion liters. Fuel consumption is not in line with fuel production, necessitating the development of alternatives energy. One of them is to use Nyamplung seed that is processed into biodiesel. Nyamplung (Calophyllum inophyllum L.) is a plant which commonly found around the coast. Nyamplung plant is one of the biodiesel alternative materials that have a large potential to be developed to overcome the problem of scarcity of fuel. The advantages of Nyamplung as raw material for biodiesel are the seeds have high rendement (approximately 70%) and its use does not compete with food purposes. The purpose of this study is to analyze techno-economic aspect of biodiesel industry establishment of Nyamplung seed. Scope of research includes techno-economic on the market and marketing aspects, technical and technological, management and organization, environmental, legal, valuation and commercialization, as well as financial aspects. This biodiesel industry is planned to be located in Banyuwangi with the selection criteria associated with using AHP (Analytical Hierarchy Process) and the industrial capacity of 1000 liters per day with raw materials as much as 4500 kg per day. After a deep assessment of all aspects, it can be concluded that the industry of biodiesel from Nyamplung seed is feasible to be realized.
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Judul: Feasibility Study for Development of Calophyllum Oil and Resin Industry
Abstrak: Pemanfaatan tanaman yang berkhasiat bagi kesehatan merupakan aspek yang perlu dikembangkan di Indonesia. Hal tersebut disebabkan besarnya jumlah tanaman berkhasiat yang belum dimanfaatkan dalam industri. Nyamplung merupakan salah satu tanaman berkhasiat tinggi yang prospektif untuk dikembangkan. Faktor utama yang menjadikan nyamplung prospektif adalah minyak dan resinnya yang memiliki banyak manfaat, serta produktivitas bahan bakunya yang tinggi. Studi kelayakan industri dilakukan agar dapat diketahui kelayakannya ditinjau dari beberapa aspek, yaitu aspek pasar dan pemasaran, teknis dan teknologi, manajemen dan organisasi, lingkungan, kelayakan finansial, dan analisis sensitivitas. Penentuan lokasi industri dilakukan dengan metode Brown-Gibson, sehingga didapatkan lokasi pendirian di Kawasan Industri Jababeka, Kabupaten Bekasi, Jawa Barat. Industri berjalan dengan kapasitas produksi minyak sebesar 72 315.625 L/tahun dan resin sebesar 18 250 L/tahun. Berdasarkan kriteria kelayakan finansial, industri tidak layak untuk dijalankan dengan NPV yang didapatkan sebesar Rp -3 327 250 185, IRR sebesar -31.89%, gross B/C ratio sebesar 0.9422%, dan PBP lebih dari 10 tahun. Berdasarkan analisis sensitivitas, didapatkan 2 usulan perbaikan agar industri menjadi layak. Usulan 1 adalah penurunan biaya tenaga kerja 20% dan biaya bangunan industri 30%. Usulan 2 adalah penurunan biaya tenaga kerja 10%, penurunan biaya bangunan industri 10%, dan peningkatan harga jual produk 5%., The utilization of efficacious plants for health is an aspect that needs to be developed in Indonesia. This is due to the large number of efficacious plants that have not been used in industry. Nyamplung is one of the plants with high efficacy that prospective to be developed. The main factors that make nyamplung become prospective are its oil and resin which have many benefits, and also its raw material high productivity. The feasibility study was conducted based on several aspects, such as market and marketing, technology and engineering, organization and management, environmental, finance, and sensitivity analysis. The determination of industrial location was done by applying the Brown-Gibson method, and the selected location was Kawasan Industri Jababeka, Bekasi, West Java. The industry produced oil of 72 315.625 L/year and resin of 18 250 L/year. Based on the financial eligibility criteria, the industry was not feasible to be established with NPV of Rp -3 327 250 185, IRR of -31.89%, gross B/C ratio of 0.9422%, and PBP for more than 10 years. Based on sensitivity analysis, it was known that there were 2 proposed solutions that made the industry was feasible. Solution 1 was 20% reduction in labor cost and 30% reduction in industrial facilities cost. Solution 2 was 10% reduction in labor cost, 10% reduction in industrial facilities cost, and 5% increase in product price.
Keyword: Brown-Gibson method, Calophyllum, feasibility study, oil, resin

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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