Judul: Penurunan Kadar Sukrosa dan Total Koloni Fungi Papan Partikel Ampas Tebu dengan Perendaman Air dan Penambahan Fungisida
Abstrak: Bagasse was the materials that can be used as a raw material for particle board. The problem that occured in bagasse was odor caused by the growth of fungi which appear as a result of the sucrose content in material. The objectives of this research were to find out the effect of soaking and fungicides addition on sucrose levels and fungi colony counts, to obtain best combination of both treatments, and to know the physical properties of bagasse particleboard resulted. Hot and cold soaking and fungicides addition on level 0.000, 0.125, and 0.250 g/L of water used to reduce the levels of sucrose and inhibit fungi growth. Sucrose content test showed that the best treatment was in hot soaking with total sucrose 0.717%. The best total fungal colony test was in fungicide 0.125 g/L with a total value of 0 colony. There was a significant correlation between soaking and fungicide added with the density, water content, water absorbsion, and swelling thickness analysis. The best treatment in the research was in bagasse particleboard with hot soaking treatment and fungicide level 0.125 g/L.
Keyword: fungicide, soaking, particle board, bagasse

Judul: Sifat fisis dan mekanis papan partikel Bambu Betung dengan perlakuan perendaman asam asetat
Abstrak: Bamboo can be used as an alternative raw material for many wooden products. One of the promising products that can be developed from bamboo is a particleboard. However, previously experiment reported that some physical and mechanical properties of bamboo particleboard were lower than that of standard requirement. In order to improve the quality of bamboo particleboard, this research aimed to study the effect of acetic acid soaking pretreatment on physical and mechanical properties of Betung bamboo particleboard. Bamboo particle was soaked in 1, 2, and 3% acetic acid solution, respectively. Urea formaldehyde (UF) adhesive was used for binder which the target density of particleboard was set at 0.70 g/cm3. The UF bonding of bamboo particleboard with and without addition of hardener were used as control. Physical and mechanical properties of particleboard were tested in accordance with JIS A 5908:2003 standard. The result showed that acetic acid soaking pretreatment increases the physical properties of particleboard, nevertheless, it has not met the standard of Japanese Industrial Standard (JIS A 5908:2003). The mechanical properties of particleboard have met the standard of Japanese Industrial Standard (JIS A 5908:2003) for modulus of rupture (MOR), internal bond (IB) and Screw Holding Power. The increasing of acetic acid concentration the decreasing of board strength was observed, indicating that a part of chemical component of bamboo degraded by acid.
Keyword: Bogor Agricultural University (IPB), urea formaldehyde, particleboard, betung bamboo, acetic acid

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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