Judul: Pertumbuhan Jabon Merah, Jabon, dan Sengon Buto di Lahan Bekas Tambang Batubara PT. Tunas Inti Abadi, Kalimantan Selatan
Abstrak: Mined land reclamation are important in restoring environmental conditions such as baseline prior to mining activites. The purpose of this research is to look effect manure dose given to each planting hole on jabon merah (Anthocepalus macrophyllus), jabon (Anthocepalus cadamba) and sengon buto (Enterelobium cylocarpum) and to compare the best growth of all three species of plants. The research was conducted on mined lands of PT. Tunas Inti Abadi, South Kalimantan. Experimental design used in this research was completely randomized design (CRD) factorial, with factors are spesies and dose of manure. Parameters used to look the growth of plant is height and diameter. Result showed that the dose of manure significantly affected diameter growth, but did not significantly affect plant height growth. Highest diameter growth was made by sengon buto. Spesies did not significantly affect diameter, but they showed significant differences on height growth rate. Sengon buto is the fastest growing species in term of height. Interaction between the dose of manure to species of plant affect only on diameter. The best species among the three spesies itested was sengon buto.
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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: 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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