Judul: Manajemen Pembibitan Tanaman Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Padang Halaban PT SMART Tbk, Sumatera Utara
Abstrak: Internship have been done at Padang Halaban Estate PT SMART Tbk, North Sumatera. Internship carried out for 4 months starting from February 2014 until June 2014. The objective of internship are to improve knowledge and skills in analyzing and understanding the various problems in the process of oil palm nurseries, technical aspects and managerial of oil palm plantation. Oil palm nursery at Padang Halaban Estate of PT SMART Tbk used ramet or zygotic embryos Dami Mas variety as a source for seedling. After 4 month observation, Dami Mas’s seedlings have the highest percentage of survival rate compared to PPKS variety. At pre nursery, it was 98.21 %. This is the indicator that Dami Mas’s seedling have a good quality as a seedling source. The vegetative growth seedlings of ramet at main nursery have average of high, diameter of stem, and number of midrib are higher than growth standard of companies seedling or standard of PPKS seedling. The result of seedling selection showed that abnormal seedlings were selected as much as 14.89% in main nursery.
Keyword: Bogor Agricultural University (IPB), Dami Mas, selection, ramet, nursery, Elaeis guineensis

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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