Judul: Studi Pembuatan Dodol Tapai Talas Belitung (Xanthosoma Sagittifolium)
Abstrak: Dodol, one of Indonesian traditional food, is very familiar among Indonesian, like dodol from Garut, jenang from Kudus, or suwar-suwir from Jember. Dodol is an intermediate moisture food (IMF) that has 0.60-0.80 water activity (Aw) which could trigger mold and yeast growth and make this product has short shelf life. Taro belitung dodol was made with 2x2x2 cm dimension of taro belitung that has been fermented in 36 hours, rice flour, and sugar. This study used three degrees of sugar concentration treatments 30%, 40%, and 50% sugar concentrations using taro weight as basis. These were evaluated by 70 untrained panelists. The result showed that formula with 30% sugar was selected best. This formula was used for further analyses, such as pH, total titratable acid (TTA), water activity (Aw), texture analysis, proximate analysis, and visual microbes observation. Chemical analysis showed that fermented taro dodol has pH value 5.56 and has TTA 76.23 ml NaOH 0.1 N/ 100 ml sample solution. The fermented taro dodols have 40 days shelf life before microbes growth in and sensory deterioration at 19 days storage
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Judul: Perbaikan Proses untuk Peningkatan Umur Simpan Dodol Talas
Abstrak: There are six main steps in this research, which is surveying UKM Sawargi, preparing the taro flour and grated taro, making the taro dodol, storaging the taro dodol in room temperature, analyzing the sample, and settling the shelf life of taro dodol. The analysis is divided into five parameters, which is aw, the penetrometer result, the acceptance sensory test of product in term of rancidity and texture, and the growth of mold. The result of this research is that taro dodol which made using taro flour is having longer shelf life compare to taro dodol which made using grated taro. The difference of shelf life is about 11 days, which is taro dodol from taro flour last for 32 days and taro dodol from taro grated last for 21 days. Meanwhile, the initial shelf life of taro dodol produced by UKM Sawargi is 10 days. The spoilage of taro dodol is indicated with the growth of mold which is visually detected. It makes the most critical parameter for the spoilage of taro dodol is aw with the limit of aw is 0.80.
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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. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular