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: Pengelolaan Pembibitan Kelapa Sawit ( Elaeis guineensis Jacq) Di Kebun Teluk Bakau, PT Bhumireksa Nusa Sejati, Kabupaten Indragiri Hilir, Provinsi Riau
Abstrak: This internship was aimed to acquire the knowledge, technical skills and management of trainer students to work professionally, increase the soft skill of students to prepare themselves to be professional worker, especially in management aspects of oil palm nursery. This internship has been done in Teluk Bakau Estate, PT Bhumireksa Nusa Sejati, since February to June 2014. The technical aspects that were carried out during the internship consist of following the existing activities in the oil palm nursery in Teluk Bakau Estate, fertilizing the immature plants, weed control on immature plants, and harvesting. Mananejerial aspects were performed as a companion foreman and division assistant. Observation were carried out on germination growing percentage, seedling plant height, and of abnormal seedlings percentage in the pre-nursery. From observation, we found that seedling plan height increase about 2 cm/week, germination growing was 95.9 percent, and abnormal seedlings was 5.9 percents.
Keyword: Bogor Agricultural University (IPB), pre-nursery, germination growing, abnormal seedling

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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