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: Edible Film Komposit Pati TapiokaAgar Kertas Terplastisasi Gliserol dan Limonena
Abstrak: Edible film is a food packaging material which can be consumed directly. The objective of this research is to composite edible film with tapioca starch, agar and plasticizers, namely glycerol and limonene. Edible film was made in 2 conditions, by adding fixed agar constituent (10%w/w) and fixed glycerol constituent (10%w/w), while other parameters were varied. Thermal analysis, specific gravity, tensile strength, water vapor permeability, and morphology of edible film were analyzed as it was applied for strawberry packaging. The addition of agar increased the specific gravity and tensile strength of edible film but percentage of elongation and water vapor permeability decreased. The composition of agar:glycerol:limonene (10:5:5) (%w/w) showed high tensile strength and specific gravity but low water vapor permeability. Thermal analysis showed decreasing of melting point was occurred when the concentration of limonene was increased. In addition, single melting point peak showed edible film was homogenous, this result was supported with morphology analysis. Edible film which was made of agar:glycerol:limonene (10:5:5) (%w/w) composition resulted in the longer shelf-life of strawberry for 3 days
Keyword: Bogor Agricultural University (IPB), tapioca starch, glycerol, edible film, agar

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.
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