Judul: Laboratory Evaluation of The Efficacy of Pine Wood Pellets with 0,25% Hexaflumuron Active Against The Subterranean Termite Coptotermes curvignathus
Abstrak: Umpan rayap berbahan aktif hexaflumuron merupakan teknologi pengumpanan yang ramah lingkungan. Formulasi umpan menggunakan kayu tusam sebagai bahan tambahan. Kandungan resin kayu tusam mengurangi kesukaan rayap terhadap kayu tusam sehingga perlu dikurangi agar tingkat kesukaan rayap meningkat. Penelitian ini bertujuan untuk mengevaluasi efikasi formulasi umpan pelet dari kayu tusam (Pinus merkusii) yang diberi perlakuan pendahuluan presto (0,4 bar, 100 °C) kemudian diberi bahan aktif hexaflumuron 0,25% terhadap rayap Coptotermes curvignathus. Serpihan kayu tusam di presto selama satu, dua, tiga, empat dan lima jam sebagai perlakuan kemudian dihaluskan (40-60 mesh) dan ditambah hexaflumuron (0,25%). Campuran dibentuk pelet lalu diumpankan terhadap rayap tanah C. curvignathus (JIS K 1571:2010). Hasil penelitian menunjukkan bahwa ketermakanan formulasi pelet berbahan aktif hexaflumuron (14,33%) lebih tinggi dibanding kayu tusam solid (6,58%). Formulasi umpan pelet berbahan aktif hexaflumuron 0,25% dengan perlakuan pendahuluan presto mampu mengeliminasi rayap tanah C. curvignathus., Termite bait with active ingredient hexaflumuron is an environmentally friendly baiting. The bait formulation used pine wood as an additive. The resin content in pine wood can reduce termites preference for pine wood so it needs to be reduced so that the level of termites preference can be increased. This study aims to evaluate the efficacy of the bait formulation of pellets from pine wood (Pinus merkusii) which was pretreated with presto (0,4 bar, 100 °C) with 0,25% active ingredient hexaflumuron against termites Coptotermes curvignathus. The treated chips then made into sawdust (40-60 mesh) and added with hexaflumuron (0,25%) and formed into pellets then fed to the subterranean termites C. curvignathus (JIS K 1571:2010). The results showed that palatability of formulation pellet bait with active hexaflumuron (14.33%) was higher than solid pine wood (6,58%). The formulation of pellet bait with 0,25% active hexaflumuron with presto pre-treatment was able to eliminate the subterranean termite C. curvignathus.
Keyword: elimination, presto, resin, termites bait, weight loss

Judul: Pengujian Laboratoris Efikasi Hexaflumuron 0.5% terhadap Rayap Tanah Coptotermes curvignathus Holmgren (Isoptera: Rhinotermitidae)
Abstrak: Subterranean termite Coptotermes curvignathus Holmgren (Isoptera: Rhinotermitidae) is the most important buildings destructing insects in Indonesia. Up to now, soil treatment and wood preservation are the most popular termite control techniques in urban areas. However, applications of both techniques could causing environmental pollution. Meanwhile termite baiting is known as more environmentally friendly termite control technique. One of the active ingredient used in the baiting system is hexaflumuron. A laboratory study was conducted to determine the efficacy of two formulations of hexaflumuron 0.5 % i.e blocks formulation and pellet formulation, against subterranean termite C. curvignathus based on PSIH-IPB-1998 standard methods. The results showed that both formulations of hexaflumuron 0.5 % is effective to eliminate the C. curvignathus. However, palatability of pellet formulation (49.43 %) is much higher than palatability of blocks formulation (8.52 %)
Keyword: palatability, subterranean termites, hexaflumuron

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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