Judul: Pengelolaan Perkebunan Sagu (Metroxylon Sago Rottb.) Di PT. National Sago Prima, Selat Panjang, Riau Dengan Aspek Khusus Pengambilan Sampel Pelepah
Abstrak: The objective of this study was investigated representative leaf sampling for predicting the sago nutritional status. Investigation used regression method that comparing three frond that have bigest regresion. The regresion is relationship between leaflet length and nutrient level of each leaflet. The soil nutrient analyisis was conducted to support best desicion for sampling recomendation. This experiment held in PT. National Sago Prima, Selat Panjang, Riau from February to June 2011. The primary data, was collected from sago palm leaflet, and nutrient assesment in laboratory. The socondary data were found by interview and discussion with the company staffs and literature study in order to get more informations. Observation was replicated three times (Blok H29, N25 and H31). Each replication containing 20 sago palm tree. In each replication measured two parameters : phase and plant quality. The plant quality measure by number of frond in each main sago plant. The phase divide in two categories: after trunk formation (SP) and before trunk formtion (BP). Sago palm that have frond more than or equal seven , marking as 1 and sago plam that have frond less equal than seven mark as 0. The result showed that frond 9 to be sampled at after trunk formation phase and frond 3 suggest to be sampled at before trunk formation phase.
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Judul: Pengelolaan perkebunan sagu (Metroxylon spp) di PT. National Sago Prima, Selat Panjang, Riau: seleksi bibit sagu berdasarkan jenis, tinggi pohon induk dan bobot bibit sagu terhadap pertumbuhan bibit sagu di persemaian
Abstrak: Sago nursery is a special factor that performed during the internship activities at PT. National Sago Prima, Selat Panjang, Riau. The experiment was conducted to obtain information in a nursery on the effects of this type of sago, height of mother plant sago and weight of sucker. The type of sago used was spiny sago (S1) and sago without spiny (S2). Height of mother plant used was 3.3 m - 4.6 m (T1), 4.6 m - 6.6 m (T2), more than 6.6 m (T3) and mother plant that have been harvested (T4). Sucker Weight used was 0,5 kg – 1,5 kg (B1), 2 kg – 3 kg (B2) dan 3,5 kg – 4,5 kg (B3). The results shown sago without spiny is better than spiny sago, height of mother plant is not effect significantly and sucker weight 3,5 kg – 4,5 kg is better than two other sucker weight. During the internship activities, sago cultivation activities conducted to obtain primary data. Secondary data were obtained by conducting interviews, discussions and reading of literature contained in the company.
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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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