Judul: Pertumbuhan Semai Jabon (Anthocephalus cadamba Roxb Miq) Pada Media Pasca Penambangan Batubara Yang Diperkaya Fungi Mikoriza Arbuskula, Limbah Batubara dan Pupuk NPK
Abstrak: One of the problems created by coal mining activities is the progressive increase of critical land area size and environmental damage, which are among other things in the form of worsening physical, chemical and biological properties of soils which lead to decrease of soil fertility and disturbed plant growth. Growth and nutrient absorption by Jabon seedlings have been studied in terms of their respond toward application of Arbuscular Mycorrhizal Fungi (AMF), coal waste, and soil media being used after coal mining operation. The experiment was designed as factorial completely randomized design, comprising 3 treatment factors, namely, species of AMF inoculants (control, Glomus sp., and Gigaspora sp.), growth media (control, mixture of 15% south Kalimantan coal, and mixture of 15 % Jambi coal) and concentration of NPK fertilizer (control, 2 gram/polybag, and 4 gram/polybag) with 10 replications, so that in total, there were 270 experimental units. Results showed that interaction between AMF, growth media and fertilizer had significant effects on parameters of diameter increment, shoot biomass, root biomass, total dry weight, index of planting stock quality, and percent of AMF colonization. Parameter of height increment and number of Jabon seedling leaves were affected by interaction between AMF and fertilizer. Treatment combination of AMF inoculants, coal powder, and NPK fertilizer was able to increase the concentration and absorption of nutrients N, P and K. The three treatments combination showed positive correlation between increase in concentration of nutrients N, P and K; and shoot biomass of Jabon seedlings.
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Judul: Pertumbuhan Semai Jabon (Anthocephalus cadamba) pada Media Bekas Tambang Pasir dengan Penambahan Sub Soil dan Arang Tempurung Kelapa
Abstrak: The effect of sand mining are environmental degredation and reduction of soil quality (physically, chemistry, or biological). The land of ex-sand mining could be marginal land and causes the revegetation barrier. Soil amendment is a necessary phase for this problem i.e. additional of sub soil and charchoal of coconut shell on the soil. The species selection also determine for revegetation result. Jabon (Anthocephalus cadamba) is an pioneer, adaptive and fast growing species. The aim of this reasearch are to analyze the effect of sub soil and charcoal of coconut shell increment to the growth of jabon seedling on ex-sand mining soil and to find out the optimum dose of sub soil and charcoal of coconut shell increment. The result of this research showed that sub soil and charcoal of coconut shell increment on ex-sand mining soil extend positive influence. The combination 500 g sub soil and 20 g charcoal of coconut shell gave the best growth for jabon seddling on ex-sand mining soil.
Keyword: sub soil, sand mining, coconut shell, charcoal, Anthocephalus cadamba

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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