Judul: Respon Pertumbuhan Jabon terhadap Sumber Benih dan Dosis Pupuk yang Berbeda pada Lahan Bekas Tambang Batubara di PT Kaltim Prima Coal, Sangatta, Kalimantan Timur
Abstrak: The activities of mining exploitation included scraped activity of top soil, dredging and hoarding could result negative impact for environment. The impact of mining activity could open forest canopy layer, soil erosion, sedimentation, decreasing fertility and stability land, destroy habitats for wildlife, and water environment pollution and significant change of micro climate due to loss of forest function. In every area of ex-mining land is neccesary to do the activities of land reclamation. Jabon is one type of local seeds which could be made as pioner trees in ex-mining land. Jabon is a fast growing species of Rubiaceae family that has many uses.The research is aimed to measure the influence of fertilizing and seed source on the growth of jabon in ex-mining land and obtain optimal dose of fertilizer that is appropriate for growth of jabon. Based on the research, the best fertilizing treatment is fertilizing using 50 g NPK anorganic. Seed from Malang is more superior compared with Sangatta source of seeds.
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Judul: iRespon Pertumbuhan Tanaman Jabon (Anthocephalus cadamba (Roxb.) Miq.) Terhadap Pengapuran di Areal Bekas Tambang
Abstrak: The main problem of reclamation activities in the postmining land was marginal land that could not support the growth of plants, due to pH and the low level of nutrient. So that, the selection of local species which adaptable and the appropriate silviculture treatment was needed. Jabon (A. cadamba) is one of local tree species that had high prospect, because jabon classified into fast growing species, able to adapted various site conditions, and the silviculture treatment was relatively easy. Dolomit and gypsum were materials that contained of Ca (Calcium), which able being applied to increase the soil pH. This objectives research was to determine the effect of dolomit, crude gypsum and manure fertilizer on the growth of Jabon in postmining land at PT. Tunas Inti Abadi. The fertilizers treatment consisted of three treatments. There were 2 kg of manure fertilizer (N), 2 kg of manure fertilizer + 200 g of dolomit (KN), and 2 kg of manure fertilizer + gipsum 200 g (GN). The parameters that be measured were diameter, height, crown diameter, percentage of living. The combination of dolomit and manure fertilizear had significant effect on the 95% confidence interval the diameter of Jabon.
Keyword: reclamation, calcification, fertilizer, jabon

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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