Judul: Pengelolaan Tanaman Tebu (Saccharum officinarum L.) di PG Madukismo PT Madubaru Yogyakarta dengan Aspek Khusus Manajemen Tebang Angkut Tebu.
Abstrak: The objective of this internship is to increase technical and managerial skill. The internship was conducted from February 13th until May 13th 2012 at PG Madukismo PT Madubaru, Bantul, Yogyakarta. Observations made with the specific aspects of harvest and transportation management. Particular aspect observed was losses and the percentage of sugar cane trash. The results obtained from the observation is all the problems that occur during harvest and transportation can be managed by applying the good practises of harvest and transportation management. Harvest and transportation management is an activity in organizing and putting things relating harvest and transportation according to the standards. Losses in Bantul area larger than the area of Purworejo. Levels of impurities in PG Madukismo percentage is still below the tolerance limit corporate standards. A proper harvest system is consider terms of sugarcane milling capacity, the optimal maturity, state of the plant, area conditions, weather and climate, the number of worker and transport methods. Losses of sugarcane during harvest have effect on the productivity levels of sugar that produced.
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Judul: Pengelolaan tanaman tebu (Saccharum officinarum. L) di PG Madukismo PT Madubaru Yogyakarta dengan aspek khusus manajemen tebang angkut tebu
Abstrak: Pabrik gula (PG) Madukismo berdiri pada tahun 1955. Pabrik gula ini merupakan perusahaan swasta di bawah pimpinan Sri Sultan Hamengkubuwono IX. PT Madubaru PG/PS Madukismo berdiri dari dua kepemilikan saham, yaitu 65% milik Sri Sultan Hamengkubuwono IX dan 35% milik PT Rajawali Nusantara Indonesia. PG Madukismo didirikan di lokasi bekas PG Padokan 5 km di sebelah selatan Yogyakarta, tepatnya di Desa Padokan, Kelurahan Tirtonirmolo, Kecamatan Kasihan, Kabupaten Bantul, Provinsi DIY. Pabrik menempati areal seluas 276,000 m² dengan luas bangunan 51,000 m². Berdasarkan letak geografi, PG Madukismo terletak antara 7°4' LU dan 8°20' LS dan antara 110° dan 111° BT pada ketinggian 84 m dpl. Kegiatan magang bertujuan untuk meningkatkan pengetahuan dan keterampilan dalam setiap teknis budidaya dan manajemen di perkebunan serta mengetahui bagaimana manajemen tebang angkut tebu yang baik dan benar. Magang ini dilaksanakan mulai tanggal 13 Februari hingga 13 Mei 2012 di PG Madukismo PT Madubaru, Bantul, Yogyakarta. Kegiatan magang dilaksanakan dengan menggunakan dua metode yaitu metode langsung dan metode tidak langsung. Metode langsung meliputi beberapa kegiatan mengenai aspek teknis, aspek manajerial, dan aspek khusus yang merupakan data primer dan diperoleh secara langsung di lapangan. Metode tidak langsung yang dilakukan pada saat magang adalah pengumpulan data-data sekunder PG Madukismo beserta studi pustakanya. Berdasarkan kegiatan manajemen tebang angkut tebu yang dilakukan di lapangan, diperoleh data kehilangan hasil panen dan persentase kotoran tebu. Kehilangan hasil panen tersebut diukur dari tebu tertinggal di lahan yang berupa tunggul/tunggak. Hasil yang diperoleh adalah kehilangan hasil panen pada tebu tertinggal di lahan daerah Bantul lebih besar dibandingkan dengan daerah Purworejo…dst
Keyword: Harvest, Transportation, Management, Trash

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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