Judul: Analisis energi pada proses pembuatan minyak nyamplung
Abstrak: Energi merupakan sumber kebutuhan vital bagi masyarakat. Kondisi empiris menunjukkan bahwa sebagian besar masyarakat masih tergantung pada sumber energi yang berasal dari fosil seperti minyak dan gas. Penggunaan bahan bakar fosil saat ini mulai dikaji ulang karena ketersediaannya mulai menipis dan butuh waktu yang relatif lama untuk terbentuk kembali. Sementara itu konsumsi bahan bakar minyak (BBM) pada sektor transportasi untuk jenis gasoline oktan 88 (premium atau bensin), gasoline oktan 92 (pertamax), dan biodiesel 5% (biosolar) juga meningkat tiap tahunnya. Salah satu alternatif sebagai pengganti bahan bakar fosil adalah biofuel yang berasal dari sumberdaya hayati yang bisa diperbarui berupa minyak nabati dan hewani. Salah satu sumber minyak nabati yang dapat digunakan sebagai bahan bakar adalah Nyamplung (Calophyllum inophyllum). Kelebihan Nyamplung sebagai bahan bahan baku biofuel adalah menghasilkan rendemen yang cukup tinggi, mencapai 72%, tersebar merata secara alami di Indonesia dan memiliki daya bertahan hidup yang tinggi, produktivitasnya tinggi hingga 20 ton/ ha sedangkan jarak pagar 5 ton/ha, berbuah sepanjang tahun, sebagai wind breaker yang melindungi tanaman pertanian agar tidak rebah terkena angin besar, dan tidak berkompetisi dengan kebutuhan pangan. Biji nyamplung mengandung minyak 40-72%; air 25-35%; dan abu 1.1-1.3%. Minyak kasar mengandung asam resin 9.7-15% yang menyebabkan minyak berwarna hijau, rasanya pahit, dan beracun. Berdasarkan jumlah tegakan pohon nyamplung yang ada di Indonesia, potensi minyak nyamplung yang dihasilkan sebesar 39,405.6 ton/ tahun atau 43,784,000 kl/tahun
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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: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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