Judul: Pengelolaan sagu (Metroxylon spp.)  Di PT National sago Prima, selat panjang Kab. Kepulauan Meranti, Riau, dengan aspek khusus pertumbuhan bibit di lapang
Abstrak: This intenship was held in Nasional Sago Prima company, Selat Panjang, Riau from February to June 2011. The Method are direct for getting primary dara and indirect for secondary data. Secondary data takes from technique activity in tthe field and the research. The experiment was conducted to get more information on the effect sucker weight and time after nusery to to sucker growth in plantation are. The treatment will be tested sucker growth with the different weight and age of sucker in raft nursery system. The first treatment on sucker 2-4 kg (BI) and 4-8 kg (B2), teh second treatment on sucker is 2 weeks after nussery (P1), 4 weeks (P2), 8 weeka (P3) and 12 weeks (P4), the result shown treatment on 2-4 kg (B1) is better than nursey was significant different in presentation survival rate bt in vegatative growth haven't significantly difference. The sucker 123 weeks after nursery was the best sucker age to the vegetative growth of suckers.
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Judul: Pengelolaan sagu (Metroxylon spp.) Di PT. National Sago Prima, Selat Panjang, Riau dengan aspek khusus pengaruh bobot bibit dan penggunaan pupuk organik cair terhadap pertumbuhan bibit sistem polibag di pembibitan
Abstrak: The objective of this study was to obtain some informations about sago palm cultivation especially in nursery and know the effect of sucker weight and liquid manure application to the vegetative growth of sago sucker at polybag nursery system. This experiment held in PT. National Sago Prima, Selat Panjang, Riau from February to June 2011. The primary data were found by direct methods, it included the following activities in cultivation of sago palm, and did experiment in the field. The secondary data were found by indirect method, interviewed and discussed with the company staff and study literature to get more informations. The special aspect was find by arranged in split plot design, where the main plot was sucker weight with three levels (50-200 g, 200-500 g, and 500-800 g) and the subplot was four levels of liquid manure application (0, 2, 5, and 8 ml/l) with three replications. The results showed that there was no significantly different in the vegetative growth of sucker by liquid manure application. The sucker weight treatment showed significantly different to survival rate, leaf length, number of leaves, and percentage of expanded leaves. The larger suckers produced higher of leaf length. However, larger suckers didn’t always produce higher percentage of expanded leaves and higher survival rate of suckers in comparison to smaller ones. The sucker weight 200-500 g was the best sucker size to the vegetative growth of suckers
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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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