Judul: Pengelolaan Tanaman Tebu (Saccharum officinarum. L) di Pabrik Gula Madukismo dengan Aspek Khusus Manajemen Tebang
Abstrak: Sugar is one product that is very important for food security in Indonesia sugar demand is greater than the national sugar production are met by import of sugar. High import sugar can be reduced by increasing national production, with intensification. One way of intensification is do a good management and planned of cutting, loading, and transport, because the poor management can increase the sugar yield losses of 5-25%. Internship aimed to improve the skills to do the cultivation and management of sugar cane plantation. analyze and identify exact, optimal, and efficient of management cutting, loading, and transport on dry land sugar cane plantations. The obbservation results shows that the East Sleman and Bantul gardens have different harvest quality. It is proved by a decrease in brix value of Bantul 2 times bigger than the East Sleman, Bantul stumsps loss greater 2.24 time than East Sleman, and the average performance of East Sleman larger than Bantul 0.1 tons / day / labor. Harvest quality Sleman Bantul lower than the East because the collapsed of the sugar cane plantations
Keyword: Bogor Agricultural University (IPB), management, harvest, sugar cane

Judul: Pengelolaan Tanaman Tebu (Saccharum officinarum L.) di Pabrik Gula Madukismo, PT. Madubaru, Yogyakarta: dengan Aspek Khusus Mempelajari Produktivitas Tiap Kategori Tanaman
Abstrak: The study of the productivity of the various categories of sugarcane held in the Madukismo Millsworking area, Madubaru Company, Yogyakarta. This activity began in February 13 to May 14, 2012. The sample is taken at Sleman and Bantul district. The method used is the direct field observation, data from the division of plant productivity, as well as interviews with farmers. The results obtained on the productivity of down land is higher than up land. Differences in land characteristics influence the productivity of sugarcane. In addition, the downland productivity tended to decrease from the plant cane (PC) to ratoon crop (RC) in each subsequent season. For up land, there is higher productivity at ratoon cane I (RC 1) increase from low productivity in the plant cane (PC) and then back on every ratoon crop the following season. To overcome the low productivity of ratoon sugarcane needed to do the loading or replanting, or ratoon intensif nurse.
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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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