Judul: Pupuk Organik untuk Pertumbuhan Bibit Jabon (Anthocephalus cadamba miq.) dan Ketahanannya Terhadap Penyakit
Abstrak: Wood supplied from natural forests decreasing and marginal land increasing and requires the development of both timber plantations and community forest. This is done in order to meet the increasing demand for wood commodities. Jabon tree (Anthocepalus cadamba Miq.) has good prospects because of relatively fast-growing trees in a variety of soil types. Jabon wood has pretty good marketing prospects with silviculture techniques that are relatively easy. The use of inorganic fertilizers continuously tends to destroy soil, soil structure and soil fertility. Therefore the use of liquid organic fertilizer is a solution to keep the fertility of the soil, even though used continuously. The purpose of this study was to determine the effect of application of organic manure (POC) with different doses for growth of the seedlings in the nursery jabon and to determine its effect on resistance to disease of Jabon seedlings in the nursery. As the treatment was liquid organic fertilizer which is used to seedlings Jabon consisting of a controls that is not fertilized (A), POC with a dose of 0.5 mL 100 mL-1 water or concentration of 0.5%, with the number 20 mL tan-1 (B), POC with a dose of 0.75 mL 100 mL-1 water or concentration of 0.75%, with the amount of 20 mL of tan-1 (C), and 250 grams of manure tan-1 (D). Fertilization is divided into 3 (three) parts, namely the roots, stems and leaves. The result showed that the liquid organic fertilizer with a concentration of 0.5% was the best compared to other concentration with high accretion at 13.38 cm and a diameter of accretion 2.94 cm. The use of liquid organic fertilizer with a concentration of 0.5% was optimal for seedling resistance to disease Jabon spots on the leaves, which are resistant or damage rate 2.56%.
Keyword: Organic Fertilizer, Disease, Anthocephalus cadamba

Judul: Pertumbuhan tanaman jabon (Anthocephalus cadamba Roxb.Miq.) pada kondisi lingkungan kurang optimum dan respon terhadap pemupukan lanjutan
Abstrak: Jabon (Anthocephalus cadamba Roxb. Miq.) is one kind of industrial tree that grows fast (fast growing species), as a producers of wood to meet the demands of Indonesian timber which continues to increase. In the 70's 100% wood industry in Indonesia only rely on natural forests as a source of supply. The rate of degradation natural forests continues to increase causing sharply reduced timber supply. Jabon is one kind of superior wood that can be developed through Industrial Plantation Forest and the Community Forest. However, the silviculture information in its development is still limited, especially the profit of advanced fertilization and selection area. The aim of this study was to determine the growth of jabon in less optimum environment (poor drainage and under shade conditions), to determine the influence of fertilizer application on the growth of jabon and to get the optimum dose of fertilizer application.
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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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