Judul: Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Sei Dadap, PTPN III, Asahan, Sumatera Utara
Abstrak: The internship program was conducted at Kebun Sei Dadap, PTPN III, Asahan, North Sumatera from February 11th to June 10th 2013. This internship program was held to fulfill the purpose for studying the oil palm cultivation technique, understanding the factors related to oil palm harvesting process, and gaining experience and hard skill on oil palm production. The need of harvesters have become very decisive for oil palm production. Harvesters disciplinary level was still low as it was shown in areal harvest quality and became a problem that needed to be solved to increase more the plantation production quality. Kebun Sei Dadap had generally increased their production for three years in a row since 2008 to 2010, but then decreasing slightly for the last two years, since 2011, eventough the size of plantation areal has not significantly changed
Keyword: Sei Dadap, production, oil palm, harvest

Judul: Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Adolina PTPN IV Persero, Serdang Bedagai, Sumatera Utara
Abstrak: Internship program provides knowledge and skills in aspects agronomy of oil palm, both technical and managerial. This internship activities were started from February 2014 to June 2014 at Adolina Estate PTPN IV Persero, Serdang Bedagai, North Sumatera. Intership activities included, worker in the field as laborer, as supervisor and field manager. Management of harvesting included harvester, harvest capacity, harvest quality, and production as well as productivity of the palm. Secondary data were collected form literature and field devision archives such as monthly and annuals reports, as well as documentation of the field activities. Generally the needs of the harvester in Adolina Estate has been sufficient, but the quality and capacity of the harvest still low. Ripe fruits were not harvested and there were still many loosed fruits which has not been collected in the field. The production and productivity of palm per year of transplanting is not based on target. Better quality harvester and more intensive control by supervisor will improve quality and quantity of harvest.
Keyword: Bogor Agricultural University (IPB), oil palm., harvest management, Adolina Estate

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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