Judul: Karakteristik Sifat Fisis dan Mekanis Kayu Jabon (Anthocephalus cadamba Miq) dan Sengon (Falcataria moluccana Miq) dari Empulur ke Kulit
Abstrak: Physical and mechanical properties of jabon and sengon wood need studied considering both types of wood is a type of wood the most fast-growing in Indonesia. Physical characteristics of wood that needs to be known were the moisture content, specific gravity and density, while mechanical properties tested was bending strength. The results showed that jabon have moisture content, MOE and MOR higher than sengon. Density and specific gravity of jabon was also bigger than sengon wood. Moisture content tended to decrease from pith to bark both for jabon and sengon wood. The shrinkage on tangensial direction was two times larger than that on the radial direction, and longitudinal shrinkage showed a constant from pith to bark. Shrinkage increased from pith to bark both for both jabon and sengon. The largest shrinkage occured at the middle part of tree stem for jabon and sengon. The results of study indicated that the weight loss on jabon and sengon woods was caused by termites attack increased from the pith to the bark
Keyword: pith to bark, physical and mechanical properties, sengon, jabon

Judul: Analisis Komponen Kimia dan Dimensi Serat Kayu Jabon
Abstrak: Basic wood properties of Jabon (Anthocephalus cadamba Miq.) were determined in order to understand its appropriate utilization. In the present works, basic properties of wood were determined through the methods of chemical components and fiber dimensions analysis, in which the experimental factors were growth ring and tree age. The analysis of chemical components consist of the solubility of wood in hot water, cold water, NaOH 1% and ethanol-benzena, α-celullose, hemicelullose, holocelullose, acid insoluble lignin, and acid soluble lignin that was determined based on TAPPI standard and Browning procedure. On the other hand, fiber dimension measurement involved fiber length, fiber diameter, lumen diameter, cell wall thickness, fiber curl and coarseness that was determined based on Kajaani FiberLab standard. It was found that growth ring, tree age, and its interaction significantly influenced the solibility of wood in hot water, whereas tree age significantly influenced the solubility of wood in cold water and NaOH 1%, acid soluble lignin, and total lignin. Furthermore, growth ring, tree age, and its interaction significantly affected fiber dimension and its derivative values, except interaction between them did not influence lumen diameter.
Keyword: tree age, growth ring, fiber dimensions, chemical components, Anthocephalus cadamba

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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