Judul: Kajian Pengolahan dan Pendugaan Umur Simpan Beras Pratanak Dalam Kemasan Film Plastik
Abstrak: Parboiled rice has a high nutrient content and low glycemic index value, therefore, it is suitable to be consumed by people suffering diabetes mellitus. The purpose of this study was to study parboiled rice processing technique, examine its physico-chemical characteristics, and determine the shelf life of the parboiled rice during storage. The processing of parboiled rice is by soaking grain in 60 oC temperature for 6 hours, steaming at a temperature of 90 oC for 30 minutes, drying until the grain moisture content to 12-14%, milling and packaging. Determination of parboiled rice shelf life was done by using the critical moisture and Arrhenius methods in polypropylene (PP) and low density polyethylene (LDPE) plastics film packaging. The results showed that the treatment was able to increase the yield of milled parboiled rice, ash content, protein content and fat content, but it also decreased amylase and carbohydrate content. However, the physical quality of parboiled rice was still lower compared to that of the control based on head rice and broken rice contents. The shelf life of parboiled rice stored in LDPE and PP packaging by using the method of critical moisture at 84% RH and a temperature of 30% was 21.73 months and 26.43 months. Whereas the method of Arrhenius in LDPE and PP packaging based on the parameter of TBA (thiobarbituric acid) values at a temperature of 30oC was 10.55 and 13.13 months.
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Judul: Kajian pengemasan beras pratanak untuk mempertahankan mutu selama penyimpanan
Abstrak: Pengolahan beras pratanak (parboiled rice) diawali dengan proses perendaman dan pengukusan sebelum dilakukannya penggilingan. Proses ini dimaksudkan untuk meningkatkan mutu dan menurunkan Indeks Glikemik (IG) beras. Penelitian ini bertujuan untuk mengkaji pengaruh pengemasan terhadap mutu beras pratanak. Kemasan yang gunakan dalam penelitian ini meliputi kemasan PP, HDPE, dan kemasan vakum dengan berat beras masing-masing 1000 g. Beras pratanak yang telah dikemas kemudian disimpan pada suhu ruang yaitu 25-29 °C dengan RH rata-rata sebesar 70-80 %. Pengamatan mutu fisik dan mutu kimia dilakukan setiap 14 selama 3 bulan penyimpanan. Hasil penelitian menunjukkan beras pratanak pada kemasan vakum mampu mempertahankan kadar air yang paling baik yaitu sebesar 13.40 % dan persentase butir patah (19.16 %), butir mengapur (0.73 %), butir menir (1.80 %), dan butir kuning/rusak (0.38 %) paling sedikit hingga minggu ke-12 penyimpanan. Kemasan PP memiliki persentase butir utuh paling rendah yaitu 73.32 %, sedangkan kemasan HDPE sebesar 77.25 % dan kemasan vakum memiliki persentase butir kepala paling tinggi pada minggu terakhir penyimpanan yaitu 79.13 %. Beras pratanak pada kemasan PP memiliki kadar amilosa sebesar 21.58 % dan kadar protein sebesar 9 %. Kadar amilosa beras pratanak pada kemasan HDPE sebesar 20.27 % dan kadar protein 8.99 %. Sedangkan beras pratanak pada kemasan vakum memiliki kadar amilosa sebesar 21.25 % dan kadar protein sebesar 8.55 % pada minggu terakhir penyimpanan. Pada penelitian ini kemasan vakum mampu mempertahankan mutu beras pratanak paling baik sampai dengan minggu terakhir penyimpanan dibandingkan dengan kemasan PP dan HDPE.
Keyword: parboiled rice, Packaging, Glicemic Index, High Density Poly Ethylene

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology