Judul: Harvest management of oil palm (Elaeis guineensis Jacq.) at Adolina Estate PTP Nusantara IV Persero, North Sumatera.
Abstrak: Kegiatan magang dilakukan di Kebun Adolina PTP Nusantara IV Persero, Sumatera Utara dari tanggal 21 Oktober sampai dengan 21 Februari 2014. Kegiatan magang ini secara umum bertujuan untuk meningkatkan pengetahuan tentang budidaya tanaman kelapa sawit dan secara khusus menganalisis faktorfaktor yang mempengaruhi produksi kelapa sawit yaitu pemanenan. Data yang dikumpulkan berupa data primer dan data sekunder. Kebun Adolina memiliki luas areal 7 812 ha kelapa sawit. Tingkat produktivitas kebun rata-rata antara tahun 2009-2013 sebesar 23.65 ton ha-1 Tandan Buah Segar. Kebun ini memiliki 1 177 karyawan dan secara umum sudah menerapkan teknik budidaya kelapa sawit sesuai dengan Prosedur Operasional Baku (SOB) yang telah ditetapkan oleh perusahaan. Berdasarkan analisis statistik kapasitas pemanen karyawan potong buah yaitu terdapat pada selang 145.75 ± 58.17 TBS pemanen-1.
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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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