Judul: Pengaruh Asal Bahan dan Media Stek terhadap Keberhasilan Stek Pucuk Tembesu [Fagraea fragrans (Roxb.) Miq]
Abstrak: Fagraea fragrans known as tembesu is a tree species used for wood panel (MDF, medium density fiberboard), particle board, veneer and furniture. This study aimed to determine successful growth of shoot cuttings and material F. fragrans and to study the effect treatment combination the origin of cutting material and media. KOFFCO system is used for shoot cuttings F. fragrans. The results showed that the cutting material from juvenile shoot the higher percentage of shoot sprouting, survived and rooted are sprouted 61.56%; 91.42% and 76.33%. In addition, the seed material cuttings provide a very real effect on root length and root wet weight, shoot wet weight, root dry weight and shoot dry weight. The increasing age of the parent tree, diminishing cuttings success. The media cuttings cocopeat (coir dust) with paddy husk gives significant effect on root length parameter, root wet weight and very real effect at parameter root dry wet. There are interaction between the cuttings material with media cuttings, like root length parameter, root wet weight and root dry weight.
Keyword: cutting and Fagraea fragrans, age of the parent tree

Judul: Pengaruh Umur Pohon Induk dan Jenis Media terhadap Keberhasilan Stek Pucuk Bintaro (Cerbera manghas L.)
Abstrak: Bintaro (Cerbera manghas L.) is one of tree species that grows naturally on coastal areas which it seeds may produce a high quality of biofuel. Bintaro propagation generatively may reduce the seeds availability as bio fuel producer. Therefore, the vegetative propagation is one of the technique that may solve the problem. The purpose of this research were to examine the effect of parent tree’s age (6 month old and 10 years old) and the media types (zeolite, charcoal chaff, mixed of cocopeat and rice husk (2:1)) on the success of bintaro cutting sprout. Parameters observed are percentage of germinate, percentage of roots, length of primary root, and dry weight of roots. The difference of parent tree age influence significantly the cutting success of bintaro sprout. The parent tree within 6 month old gave the highest result toward all parameters observed rather than the parent tree of 10 years old. The mixed media of cocopeat and rice husk (2:1) and also the charcoal chaff gave higher respond toward the amount of primary roots and dry weight of roots compared to the zeolite media type.
Keyword: shoot cutting, media types, biofue, bintaro, age of the parent tree’s

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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