Judul: Pengaruh Suhu Kempa Terhadap Karakteristik Papan Partikel Kelobot Jagung Dengan Perekat Kitosan Larut Air
Abstrak: Kelobot jagung atau kulit jagung merupakan hasil sampingan dari pemanenan jagung. Papan partikel tanpa perekat sintetis merupakan salah satu produk papan komposit yang ramah lingkungan, karena bahan bakunya berasal dari berbagai produk samping. Penelitian ini bertujuan untuk mengetahui pengaruh suhu kempa terhadap karakteristik papan partikel dari kelobot jagung (Zea mays saccharata L.) dengan menggunakan perekat kitosan larut air. Pengujian sifat fisis dan mekanis dilakukan berdasarkan standar JIS A 5908:2003. Hasil penelitian didapatkan nilai kerapatan 0,64-0,81 g/cm3 , kadar air 6,74-9,46%, pengembangan tebal 135,80-299,61%, daya serap air 227,7-398,03%, keteguhan lentur 123982,96-601899,74 kPa, keteguhan patah 2275,20-10517,23 kPa, keteguhan rekat internal 9,17-46,82 kPa, kuat pegang sekrup 482,42-1095,71 kPa. Nilai koefisien serap bunyi tertinggi terdapat pada papan partikel dengan suhu kempa 200oC dan konsentrasi perekat 10%. Papan partikel dengan suhu kempa 180oC dan konsentrasi perekat 6% adalah yang paling baik untuk pembuatan papan partikel.
Keyword: corn husks, hotpress, particle board, Water soluble chitosan

Judul: Properties of Particle Board Made from Corn Husk: The Effect of Various Board Density and Water Chitosan Soluble Chitosan Adhesive Concentration
Abstrak: Kelobot jagung merupakan biomassa dari jagung yang potensial sebagai bahan baku untuk pembuatan papan partikel. Tujuan penelitian ini adalah mengetahui pengaruh variasi kerapatan papan dan kadar perekat kitosan larut air terhadap karakteristik papan partikel dari kelobot jagung. Papan partikel dibuat dalam tiga target kerapatan: 0,6 g/cm3, 0,8 g/cm3 & g/cm3 dengan kadar perekat kitosan larut air: 6%, 8%, & 10%. Papan partikel diproduksi menggunakan kempa panas dengan suhu kempa 180C dan tekanan kempa 25 kgf/cm2 selama 15 menit. Hasil penelitian menunjukkan bahwa nilai koefisien absorpsi suara (α) berkisar antara -0,064 hingga 0,112 untuk seluruh frekuensi (500-3000 Hz), kerapatan papan 0,51-1,02 g/cm3, kadar air 6,11-9,89%, pengembangan tebal 121,99-152,99%, daya serap air 261,44-364,95%, MOE 171,33-9045 kgf/cm2, MOR 7,95-112,59 kgf/cm2, IB 0,05-0,98 kgf/cm2, dan SHP 2,63-12,49 kgf. Secara keseluruhan, parameter koefisien absorpsi suara (α) papan belum memenuhi standar ISO 11654. Parameter kerapatan, kadar air dan MOR memenuhi standar JIS A 5908: 2003 untuk kerapatan papan 1 g/cm3. Secara keseluruhan, papan partikel dengan kerapatan papan 0,8 g/cm3 dan kadar perekat kitosan larut air 8% memberikan karakteristik papan partikel terbaik., Corn husk extracted from maize was considered as the potential material for manufactured particleboard. The purpose of this study was to evaluate the influence of variations in board density and water-soluble chitosan concentration on the properties of corn husks particleboard. Particleboards were made in three different density targets of 0.6 g/cm3, 0.8 g/cm3 & 1 g/cm3 with water-soluble chitosan adhesive concentration of 6%, 8%, & 10%. The particleboard was manufactured using a hydraulic hot press with a pressing temperature of 180°C and a pressing pressure of 25 kgf/cm2 for 15 minutes. The results showed that sound absorption coefficient (α) value ranges from -0.064 to 0.112 for all frequencies (500-3000 Hz), density 0.51-1.02 g/cm3, moisture content 6.11-9.89%, thickness swelling 121.99-152.99%, water absorption 261.44-364.95%, MOE 171.33-9045 kgf/cm2, MOR 7.95-112.59 kgf/cm2, IB 0.05-0, 98 kgf/cm2, and SHP 2.63-12.49 kgf. The sound absorption coefficient of the particleboard didn’t fulfil the requirement of ISO 11654. Density, moisture content, and MOR of the particleboard with density 1 g/cm3 fulfilled requirement JIS A 5908: 2003. Overall, the particleboard with a board density of 0,8 g/cm3 and an adhesive content of 8% water-soluble chitosan gave the best particleboard properties.
Keyword: kelobot jagung, kitosan larut air, koefisien absorpsi suara, papan partikel

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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