Judul: Pengaruh Varietas dan Umur Panen terhadap Sifat Fisikokimia Tepung Ubi Kayu (Manihot esculenta)
Abstrak: Cassava is one of the potential sources of carbohydrate that can be processed into cassava flour. The purpose of this research was to study the effect of age at harvest and cassava varieties on physicochemical properties of cassava flour. The stages of this research were started from making cassava flour by using a pin disc mill 60 mesh, then observing physicochemical properties of cassava flour. This research used a factorial random design with varieties (Adira-4, Adira- 1, UJ-5, and Malang-4) and age at harvest (6 months and 12 months) as treatments. Carbohydrate content of the varieties of Adira-4, Adira-1, UJ-5, and Malang-4 were respectively 92.73 %, 88.66 %, 90.74 %, and 90.54 % at 12 months after planting. Varietal difference and age at harvest significantly affected (P<0.05) crude protein, carbohydrate, amylose, whiteness degree, and all of RVA parametres, except maximum viscosity. Interaction between varietal difference and age at harvest significantly affected (P<0.05) crude protein, ash, fat, carbohydrate, amylose, whitness degree, and all of RVA parametres
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Judul: Pengaruh Metode Pengeringan terhadap Mutu dan Sifat Fisiko-kimia Tepung Kasava Terfermentasi
Abstrak: Cassava is one important food crops in Indonesia. Carbohydrate is major components in cassava tubers, and made it suitable used for food and energy sources. Nowadays cassava is mainly utilized as direct food, cassava flour and cassava starch (tapioca). But high moisture and prussic acid (HCN) contents in cassava tuber made limitation for human consumption. Fermentation and drying of cassava plays important roles in cassava flour production, since they can influence to the flour characteristics. This research investigated the effect of drying methods of fermented cassava slurry to the flour’s chemical composition and its physico-chemical properties. Fermentation of cassava tuber was conducted using standard operation procedure for MOCAF (modified cassava flour) prepared by Dr. Achmad Subagio (Jember University). There were three drying methods used in research; direct sundrying (16 hours), green house effect drying (hours), and oven drying (12 hours). It is also investigated the duration of drying process; especially for sundrying and green house effect drying, as 3, 5, and 7 hours and then furthered with oven drying for 9, 7 and 5 hours. Solar energy, especially ultra violet irradiation has been proven improved the flour quality. Drying on the green house effect chamber (40,1oC) provided higher average drying temperature compared to direct sundrying (33,5oC), but lower than oven drying (52,6oC). Differences in drying methods gave significant effects on moisture, ash, crude fiber, fat, protein, starch and HCN contents; whiteness degree of flours, total of microbes, microscopic appearance of starch granules, water and oil absorptions, solubility and swelling power at 90oC, and visco-amylography characteristics. All drying methods significantly reduced the HCN contents of flours, but direct sundrying and green house effect drying accelerate the liberation of starch, and caused high final viscosity of flours. Full green house effect drying (16 hours) was recommended for fermented cassava flour since it produced the flour with higher maximum and final viscosity compared to others.
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Judul: Reduksi Reverberasi dengan Narrow Beam Receiver pada Sonar untuk Akurasi Interpretasi Target
Abstrak: Salah satu pembatas utama dalam pendeteksian kelompok ikan adalah reverberasi. Reverberasi dapat sebagian menutupi sinyal echo (echo ikan) sehingga menyyulitkan, kadang tidak memungkinkan penerimaan sinyal. Penutupan sinyal ini terjadi jika besarnya penerimaan sinyal echo lebih kecil daripada peringkat reverberasi pada waktu dan jarak tertentu.
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