Judul: Pendekatan Percepatan Kerusakan Oksidatif dengan Parameter Periode Induksi untuk Pendugaan Umur Simpan
Abstrak: Oil stability index (OSI) is a method oil quality measurement that uses the principle of oil accelerated oxidative damage by heat and oxygen exposure. This study aims to apply the principles of accelerated oxidative damage in measuring the quality of palm oil and its application to estimate the shelf life of peanut products. The study was conducted in three phases, namely: designing instruments, precision testing of instruments, and shelf life testing of peanut products. The results show large variations in measurements with a value 89.06% of %GRR. Bias that comes from the instrument more influence on the measurement variation instead of the bias that comes from the appraiser, with the value of repeatability (equipment variation/EV) of 0.36 and the value reproducibility (appraiser variation/AV) of 0.09. The use of peanuts as sample produce smaller instrument bias than the instrument bias resulting on the use of palm oil samples. Anova test results showed no significant differences in part factors on the use of the peanuts sample, whereas the use of palm oil samples showed significant differences in part factors. Testing a sample of peanuts using an unmashed and mashed peanuts showed significant differences in the treatment of mashed peanuts. The results of peanuts accelerated shelf life testing (ASLT) showed a shelf life of peanut products without treatment/whole particle (3 months 18 days) is more similar to the result of peanut product shelf life testing in laboratory sensory Garudafood PT Putra Putri Jaya (3 months 27 days) when compared with the shelf life of mashed peanut products (2 months 22 days).
Keyword: Q10, Oil stability index, oil quality, Accelerated shelf life testing (ASLT), Bogor Agricultural University (IPB)

Judul: Studi kinetika perubahan mutu mikroenkapsulat minyak sawit merah selama penyimpanan
Abstrak: One of the alternatives of red palm oil utilization is to transform it into red palm oil microencapsulate (RPOM). Some indicators for RPOM quality damaged during storage are free fatty acids, peroxide value, total carotenes, and colours. Besides, its angle of repose also becomes main parameter because RPOM used is powdery product. In this research, RPOM had stored for 40 days in incubator with 35 oC, 44 oC, and 55 oC temperatures to analyzed the change of its quality characteristics. The result shows that the higher the temperature of storage, the faster RPOM get physical and chemical damages. Rate of increase of peroxide value and total rate of decrease of total carotenes are following first order reaction with each value of k are 0.0370 day-1 and 0.0067 day-1 respectively, while the rate of increase of free fatty acids and decrease of yellow colours are following zero order reaction with value of k are 0.0039% day-1 and 0.1720 unit day-1. Activation energy value for various quality parameters which derived from this study are 117327.17 J mol-1 for increase of free fatty acid; 27955.825 J mol-1 for increase of peroxide value; 69638.895 J mol-1 for decrease of carotene total; and 66194.405 J mol-1 for decrease of yellow colour.
Keyword: Bogor Agricultural University (IPB), RPOM, palm oil, order reaction, k value, energy activation value

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.