Judul: Utilization of ki ambang compost for increasing growth jabon (anthocephalus cadamba roxb miq.) In post-mining land pt bukit asam (persero) tbk, south sumatra
Abstrak: Ki Ambang (Salvinia natans) merupakan salah satu tanaman yang berpotensi menjadi fitoremediator logam berat dalam pengolahan air asam tambang. Tujuan penelitian ini adalah mengetahui kandungan Fe dan Mn dalam kompos dan mengetahui pengaruh kompos serta dosis yang tepat terhadap pertumbuhan jabon. Ki ambang dikomposkan 24 hari dengan dua jenis kombinasi, yaitu pertama ki ambang yang dikombinasikan dengan urea, serbuk kayu dan EM4 dan kedua tanpa EM4. Hasil analisis kandungan kompos dengan maupun tanpa EM4 memiliki kandungan Fe sebesar 12.613 ppm dan 12.349 ppm, sedangkan Mn 1.308 ppm dan 914 ppm. Kompos ki ambang diberikan ke tanaman jabon dengan perlakuan kontrol; 2,5 kg kompos ki ambang dengan EM4; 5 kg kompos ki ambang dengan EM4; 2,5 kg kompos ki ambang tanpa EM4; dan 5 kg kompos ki ambang tanpa EM4. Uji T menunjukkan bahwa pemberian kompos ki ambang berpengaruh tidak nyata terhadap parameter diameter, tetapi berpengaruh nyata pada parameter tinggi dan jumlah cabang. Jenis dan dosis kompos terbaik adalah kompos ki ambang dengan EM4 5 kg., Ki ambang (Salvinia natans) is one of the plants that could potentially be fitoremediator heavy metals in acid mine water treatment. The purpose of this study was to determine the content of Fe and Mn in compost and compost as well as determine the effect of dose on the growth Jabon right. Ki ambang composted 24 days with a combination of two types, namely ki ambang combined with urea, wood dust and EM4 and second without EM4. The results of the analysis of the content of the compost with or without EM4 has a Fe content of 12.613 ppm and 12.349 ppm, Mn while 1308 ppm and 914 ppm. Compost ki ambang given to the control treatment; 2,5 kg compost with EM4 ki ambang; 5 kg compost with EM4 ki ambang; 2,5 kg compost ki ambang without EM4; and 5 kg of compost ki ambang without EM4. T test showed that the administration of compost ki ambang no real effect on the ki ambang parameters diameter and number of branches. The type and dose of the best compost is ki ambang composted with EM4 5 kg.
Keyword: Anthocephalus cadamba, fitoremediator, kompos, Salvinia natans

Judul: Pengaruh Pemberian Kompos dan Arang Kayu terhadap Pertumbuhan Semai Jabon (Anthocephalus cadamba Roxb. Miq.) pada Media Bekas Tambang Pasir
Abstrak: The sands mining can cause decreasing of sand number, make air pollution, damage the roads, and water quality degradation. The sands mining will produce waste in the form of ex sand mine. The characteristic of sands are low nutrients, less on water retention, and porous. This is an obstacle for revegetation in mining land that not suitable for plant growth. Revegetation activities conducted to know the plant growth in ex sand mine media. The selection of tree species is important to the success of revegetation in ex sand mine media. Jabon (A. cadamba) is fast growing species at a young age and grow in various soil. The method in this research is completely randomized design with two factorial. The first factor is compost and the second factor is wood charcoal. The parameters are height, diameter, and total dry weight. Statistical test showed that compost gave significant effect on jabon seedling height growth at 95% confidence interval. Interaction between compost and wood charcoal gave significant effect on jabon seedling height growth at the 95% confidence interval. Charcoal didn’t give significant effect on height, diameter, and total dry weight.
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Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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