Judul: Karakteristik Mutu Biji Jarak Kering dan Minyak Terkandung Selama Penyimpanan
Abstrak: Jatropha seeds as one of selected plant for biodiesel material is easy to be damaged after the harvest. Therefore, postharvest technique especially handling and storage before being processed into biodiesels is needed. The purposes of the research are to determine the characteristic of Jatropha seed quality and its oil during the storage at room temperature and to determine packaging material which is able to maintain the quality of Jatropha seed and its oil during the storage. This quality includes the yield of jatropha oils, free fatty acid of the oil, the water content of the seed, iod number, seed fat contents and weight loss. The storage was conducted for six months after applying liquid smoke as disinfectant with the concentration 0%, 5% and 15% and packed with sack, sack + polypropylene 0,03 mm also sack + polypropylene 0,08 mm. The quality of Jatropha seed and oil includes the water content of the seed, free fatty acid of the oil, and also weight loss, generally increased after storage for six months. The free fatty acid of the oil was disqualify of Standard National Indonesia (SNI) 01-1904-1990 for 1% after six months, where as the iod number is still qualify of SNI 01-1904-1990 with the value of 87,38-88,82%.
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Judul: Pengaruh Jenis Pengemas dan Suhu Penyimpanan Terhadap Mutu Biji dan Minyak Jarak Pagar (Jathropha curcas L.)
Abstrak: Pengemasan mempunyai fungsi utama yaitu melindungi komoditas dari penurunan mutu, selain itu juga untuk mempermudah dalam penyimpanan, pengangkutan dan distribusi. Jenis kemasan juga harus disesuaikan dengan komoditasnya. Pengemasan sangat berkaitan dengan penyimpanan. Penyimpanan adalah merupakan bentuk tindakan pengamanan terhadap komoditas yang selalu terkait dengan faktor waktu. Salah satu tanaman yang berpotensi besar sebagai penghasil bahan bakar nabati adalah jarak pagar (Jatropha curcas L.). Biji jarak yang digunakan untuk produksi minyak harus tetap dijaga mutunya selama dalam penyimpanan. Kondisi penyimpanan dapat berpengaruh terhadap perubahan mutu biji jarak pagar. Apabila kondisi penyimpanan tidak sesuai, maka selama penyimpanan akan terjadi peningkatan kandungan asam lemak bebas (ALB). Tingginya ALB pada minyak akan berdampak pada proses pengolahan minyak menjadi biodiesel dan biaya produksi biodiesel juga menjadi lebih tinggi. Proses pengolahan minyak dengan kandungan ALB <2% dapat menggunakan prosedur standar yaitu transesterifikasi, sedangkan minyak dengan kandungan ALB >2% sebaiknya menggunakan prosedur esterifikasi transesterifikasi (estrans).
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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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