Judul: Sifat Kelistrikan Kayu Pinus (Pinus merkusii Jungh et de Vr.) dan Kayu Puspa (Schima wallichii Korth.)
Abstrak: Electrical properties of wood such as impedance, conductance, conductivy, capasitance, dielectric constant, inductance and resistance of pine (P. merkusii) and puspa (S. wallichii) at the frequency of 103 to 106 Hz have been studied. Wood samples were from basal, middle and top portions of a single stem of each species, while all measurement was conducted on longitudinal, radial and tangential directions. Results showed that at the frequency of 103 to 106 Hz, electrical properties were significantly influenced by wood species, sample location and direction of measurement. Effect of species was more significant. The higher of impedance, resistance and/or inductance resulted in the smaller of conductance, conductivity, capacitance and dielectric constant. In general, puspa wood is more conductive to electricity than pine wood. Both pine and puspa woods are considered as a semiconductor material at the frequency of 106 Hz.
Keyword: Bogor Agricultural University (IPB), electrical properties, Schima wallichii, puspa, Pinus merkusii, pine

Judul: Radial Variations of Anatomical Structure and Fiber Quality Class of Puspa Wood from Plantation Forest
Abstrak: Penelitian ini bertujuan mengkaji variasi radial struktur anatomi dan kelas mutu serat kayu puspa (Schima wallichii) hasil hutan tanaman umur 40 tahun, yakni antara yang di kayu gubal, peralihan dan kayu teras. Ciri makroskopis diamati secara langsung terhadap sampel uji menggunakan lup; sedangkan ciri mikroskopisnya melalui sediaan mikrotom menggunakan mikroskop cahaya. Dimensi serat diukur melalui sediaan maserasi. Panjang serat dan nilai turunan dimensi serat digunakan untuk menetapkan kelas mutu serat. Hasil penelitian menunjukkan ketiga bagian kayu puspa yang diteliti (teras-peralihan-gubal) cenderung memiliki karakteristik struktur anatomi dan kelas mutu serat yang sama; kecuali warna kayu, diameter tangensial pori, lebar dan tinggi jari-jari, serta panjang serat dan tebal dinding serat. Tipe/macam/jenis sel penyusun dan pengorganisasiannya tidak berbeda dengan yang terdapat pada kayu puspa hasil hutan alam. Secara keseluruhan serat kayu puspa yang diteliti masuk ke dalam Kelas Mutu III. Meskipun layak dijadikan bahan baku pulp dan kertas, kayu puspa yang diteliti ini lebih direkomendasikan sebagai kayu komposit, mebel dan bahkan kayu pertukangan.
Keyword: Hutan tanaman, Kelas mutu serat, Puspa, Schima wallichii, Struktur Anatomi

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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