Judul: Biofilm Pati Tapioka Terplastisasi Gliserol dengan Tambahan Natrium Alginat dan Aditif Limonena Kulit Jeruk
Abstrak: Biofilm is a thin layer that can be used as an alternative packaging and environmentally friendly. The objectives of this study ware to synthesis and to characterize biofilm made of tapioca starch with addition of glycerol as plasticizer, sodium alginate and limonene from orange peels. Then, the analysis was done to the biofilms, including the density, elongation, thermal analysis, morphology, water vapor permeability, and the application of biofilm to banana. Sodium alginate: glycerol: limonene (7.5:10:2.5) composition decreased the density, tensile strength, and water vapor permeability and increased the elongation value. The increase of glycerol concentration results in the decrease of melting point. The thermal analysis produced a single peak with melting point that showed that the biofilm was compatible. The morphology analysis showed that the film was homogenous. Application test showed that glycerol 10% can prolong the banana shelf life for 5 days.
Keyword: Bogor Agricultural University (IPB), starch, sodium alginate, limonene, glycerol, biofilm

Judul: Pencirian Edible Film Tepung Tapioka Terplastisasi Gliserol dengan Penambahan Natrium Alginat.
Abstrak: Edible film from glycerol plasticized tapioca starch with sodium alginate addition can be a potential alternative as biodegradable packing. In this experiment, glycerol was mixed into tapioca starch solution with tapioca starch-glycerol composition of 7:3 and 8:2. Sodium alginate solution was then added with concentration 0, 1, 2, and 3%. The edible film produced were tested for the density, mechanical properties, functional groups, morphology, and thermal properties. The edible film with 1% sodium alginate addition into 7:3 tapioca-glycerol composition, showed the highest tensile strength and elongation at break, 187.50 MPa and 95.62%, respectively. The edible film did not show new functional group formation, showing that the film was merely a physical mixture. The edible film’s surface was quite homogenous and formed needles-like pattern. Thermal analysis to the 8:2 and 7:3 tapioca starch-glycerol composition with 1% sodium alginate addition showed weight loss approximately 76.58 and 73.92%, respectively, with the glass transition temperature at 108.00 and 109.88 °C. The safe raw material used, and the results of analysis which fulfill led the standards provided evidence that edible film produced was safe for the body and was expected to be consumed after through the toxicity test.
Keyword: 

Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
Keyword: