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: 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.
Keyword: 

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
Keyword: