Judul: Penggunaan Berbagai Ukuran dan Periode Simpan Umbi Kentang Bibit (Solanum tuberosum L.) di Hikmah Farm, Pangalengan, Bandung, Jawa Barat
Abstrak: The general objective of this internship is to broadening the knowledge and improve the working experience in both technical and managerial. The spesific objective of internship is to study the effect of various size and storage periods of potato tuber seeds to the potatoes productivity. The result of first spesific aspect shows that the use of large seed potato tubers will produce more stems per clumps which will produce more small tuber size . The result of a second aspect experiment shows that the storage periode tuber seeds has a significants effect to the amount of small (S) tuber per plants and to the weight of small (S) tubers per row. The tuber with long storage periods tend to grow shoot faster but easier to attack by pest and disease. Long storage periods resulting more non-productive branch, low –productive, and die faster
Keyword: potatoes, potato tuber size, potato tubers storage periode, seeds potato

Judul: Penanganan budidaya kentang  (Solanum tuberosum l.) Di hikmah farm, Pangalengan, Bandung, Jawa Barat
Abstrak: This internship has been done to learn management aspect of potato cultivation and to train the ability of the author to work on field as technician or manager. This internship was implanted at Hikmah Farm, Desa Margamukti, Kecamatan Pangalengan, Kabupaten Bandung, West Java on 14 February until 14 June 2011. The internship was divided into three work section, as field labor for one month, as the assistant foreman for one month, and as the assistant head of estates for two months. The particular aspect that has been observed is influence of early ridging against the growth of potato plant. The treatment that has been done is height of ridging on 10, 15, 20 cm and observed variable was percentage of seedling growth, height of plant, number of stolons per stem and tuber weight at harvest. Analysis result has shown that the treatment height of ridging has significantly influence on percentage of seedling growth on 21st day after planting and has very significantly influence on height of plant on 28th day after planting.
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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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