Judul: Rekayasa Proses Pengolahan Beras Pratanak Untuk Memperbaiki Kualitas dan Menurunkan Indeks Glikemik pada Gabah cv. Ciherang
Abstrak: Rice milling process causes the nutrients contained in the aleuron and perikarp layer wasted and resulting high glycemic index. Foods having high glycemic index raise blood glucose level quickly, they are not recommended for consumption by people with diabetes mellitus. To provide an alternative staple food, parboiled rice could be selected. Parboiled rice processing method that has been developed in Indonesia takes a long time process, so it is necessary to find an alternative process faster and able to reduce the value of glycemic index. Parboiled process can be accelerated by soaked a few moments or even just washed, steamed with high pressure, then dried until it reaches 14% moisture content and milled. The research was aimed: (1) to study the effect of steaming pressure on physical quality, chemical composition and organoleptic properties; (2) to study the glycemic index of parboiled rice at various steaming pressure. The study was conducted using a completely randomized design with 4 treatments and 2 controls as much as 4 replications. The treatments used steaming pressure i.e 0.8 kg/cm2 (110oC), 1.5kg/cm2 (122oC), 2.0kg/cm2 (127oC) and 2.5 kg/cm2 (132oC) and controls used polished and brown rice. Parboiled rice, polished and brown rice then analyzed on physical quality, chemical composition, functional and organoleptic properties. Analysis of physical quality parameters include whole grains, heads grain, broken grains, water content and yield. Chemical composition of the analyzed parameters include moisture content, ash content, fat content, protein content, carbohydrates content, amylose and resistant starch content. Analyzed for functional properties is the glycemic index. Organoleptic test was conducted to test hedonic scale really like to strongly dislike (1-7), including color, flavour, texture and taste, of 30 untrained panelists. Data from a variety of parameters, then analyzed using the methods of data analysis of variance at level α = 5%. If there is a real difference, then followed by Duncan's multiple comparison test. The results showed that engineering of pressure parboiled rice processing, could increase physical quality i.e increased the whole grain from 63.84% to 84.55%, reduced broken from 22.65% to 7.54%, reduced small broken from 0.44% to 0.28% and increased yield from 66.01% to 72.44%. Pressure parboiled rice processing was also able to change chemical compositions i.e increased fat from 0.89% to 1.27%, increased ash from 0.57% to 0.76%, increased amylose from 30.29% to 34.5%, increased amylose resistant starch from 33.64% to 34.59%, reduced carbohydrate from 88.78% to 88.77% and reduced protein from 9.76% to 9.21%. The use of a higher steaming pressure on parboiled rice processing, could reduce the level of preferring for parameters color, arome, texture and flavor. The panelist relatively preferred of arome and texture, but rather preferred of color and flavor. Pressure parboiled rice processing with 2.0 kg/cm2 steaming pressure (127oC) could reduce the glycemic index from 48.18 to 35.52, while the steaming pressure of 0.8 kg/cm2 (110oC) could reduce the glycemic index from 48.18 to 44.88.
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Judul: Kajian Pengeringan Gabah pada Proses Pengolahan Beras Pratanak
Abstrak: Parboiled rice is rice that is produced through the 5 stages of the process of cleaning, soaking, steaming, drying and milling. Parboiled process is intended to preserve the grain because the grain has been parboiled can not germinate and also to avoid loss and damage to rice, both in terms of nutritional value and yield of rice. This research aims to study the influence of the thickness of the pile on the quality of parboiled rice Ciherang varieties using a thickness of 1, 3, and 5 cm against the physical quality and proximate. Pile thickness affect the drying rate where the thicker the pile the slower rate of drying. Pile thickness of 1 cm is the best based on the quality of its physical parameters and the third treatment was able to maintain the quality and increase the nutritional content based on proximate analysis
Keyword: Bogor Agricultural University (IPB), hot rotary oven, drying, parboiled rice

Judul: Formulasi Hamiltonian untuk Menggambarkan Gerak Gelombang Soliter Dimensi Tiga di Permukaan Laut
Abstrak: Gelombang permukaan adalah gelombang yang terjadi perbedaan rapat massa antara air dan udara. Salah satu gelombang permukaan yang ditinjau adalah gelombang soliter. Formulasi gelombang soliter dilakukan dengan menggunakan formulasi Hamiltonian.
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