Judul: Pengelolaan Panen Kelapa Sawit (Elaeis guineensis Jacq.) untuk Mendapatkan Produktivitas Tinggi di Kebun Bangun Bandar, PT. Socfindo
Abstrak: This internship activity took place in Bangun Bandar Estate, Serdang Bedagai, North Sumatra from February 2012 to May 2012. The objective of this internship was to learn the techniques of palm oil cultivation especially the harvesting system at Bangun Bandar Estate. The collected data were primary data and secondary data. Palm oil cultivation in this plantation has been running well. The main problem in the plantation is the harvest rotation be come longer from 7 days until 9 days. This occurs as a result of employee absences, holidays and days of rain in general, the fruits quality in BBE plantation is good with an average fruit maturity reaching 99.7 % and the harvest area quality 1.31 %. Based on statistical analysis, harvesting capacity of fruit cutting employer is between 269.5 ± 59.78 fruits/employee.
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Judul: Manajemen Panen Kelapa Sawit (Elaeis Guineensis Jacq.) di Kebun Tambusai PT. Panca Surya Agrindo, First Resources Ltd., Kec. Tambusai, Kabupaten Rokan Hulu, Riau.
Abstrak: The purpose of this internship program was to improve technical and managerial skills on oil palm plantation. The internship was conducted at Tambusai Estate, PT. Panca Surya Agrindo, First Resources Ltd; Tambusai, Rokan Hulu, Riau on 13 February to 12 May 2012. Primary data from field observations devoted to the preparation of fruit harvesting, and other technical and managerial aspects of harvesting, harvesting system of premiums, and production of fresh fruit bunches. Secondary data were obtained from the archives of the company for 5 years. The data were analized by using deskriptive method, percentage (%) and average value. The data and fild observations indicated that there were harvesting management problem needed to be improved. The problem related with the back number of harvester, caused too high harvest capacity of each harvester, and the less accurate of yield prediction. Asno the consequency of the problem was the late of transportation to the mill and the processing of FFB at the mill
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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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