Judul: Pengaruh Kerusakan Buah Kelapa Sawit terhadap Kandungan Free Fatty Acid dan Rendemen CPO di Kebun Talisayan 1 Berau
Abstrak: The objective of this internship specifically was to study the factors that affect the quality of CPO. The internship was conducted in Talisayan 1 Estate PT Tanjung Buyu Perkasa Plantation, Berau, East Kalimantan from February to June 2013. Problem analysis using Ishikawa diagram and linear regression by making poor quality fruit, fruit “restan” (leftover), injury fruit, and the loss of crops as factors that cause of problems, both the activity of harvesting until transporting the yields. The analysis show that CPO degradation probelms one of which can be seen from the low rendement of palm oil (CPO) and high Free Fatty Acid (FFA) CPO. Low oilrendementcausedbypoorfruit qualityandyieldloss. High FFA CPO causedbypoorqualityfruit, leftoverfruit, andfruitinjury.
Keyword: rendement, palm oil, harvest, FFA, CPO

Judul: Manajemen Panen Kelapa Sawit : Hubungan Mutu Buah dan Curah Hujan Terhadap Kandungan Asam Lemak Bebas di Kebun Rambutan PTPN III Sumatera Utara
Abstrak: Internship activitywas conducted in order to increase knowledge, skills, and experience in the oil plantation, as well as to study relationship between harvest management and content of free fatty acid (FFA). Activities were carried out from February to June 2014 at the Rambutan Estate of PTPN III in North Sumatera Province. Effects of fruit quality and precipitation on FFA were analyzed by using multiple linier regression models. Results showed that FFA content significantly affected by percentage of delayed-processed bunches (restan) (P value = 0.087). Increasing level of delayed-processed bunches at rate of 1% (kg) increased FFA level of 0.001%. Percentage of over ripe, unripe and under ripe fruits and precipitation did not significantly affect FFA level. This research implies that control of delayed-processed bunch is important to maintain level of FFA.
Keyword: Bogor Agricultural University (IPB), restan-fruit, general linier model, free fatty acid, crude palm oil

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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