Judul: Pengelolaan pemangkasan jeruk keprok (citrus sp.) Di kebun blawan, ptpn xii , bondowoso, jawa timur
Abstrak: The internship programe was conducted at Blawan Estate, PTPN XII, Bondowoso, East Java for three months from February 13th until May 13th 2012. The purpose of this internship program is to improve technical and managerial skill. This internship programe was conducted using direct and indirect method, by followed all of the practices in the field, field plantation observation, and discussion with staf (direct method). The information were collected including primary and secondary data. Pruning criteria, plant condition, labour achievement, pruning time, and bud growing rapidity was collected as primary data. Pruning could decrease the intensity and severity of antracnose. However, management pruning of orange could not implementable as SOP (Standart Operating Prosedure).
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Judul: Pengelolaan Pemupukan Jeruk Keprok (Citrus Nobilis L.) Di Kebun Blawan, Ptpn Xii, Bondowoso, Jawa Timur
Abstrak: Kegiatan magang dilaksanakan di Kebun Blawan, PTPN XII, Bondowoso, Jawa Timur selama tiga bulan dari tanggal 13 Februari hingga 13 Mei 2012. Kegiatan magang ini secara umum bertujuan untuk menigkatkan keterampilan teknis budidaya jeruk keprok dan secara khusus untuk mempelajari dan menganalisis pemupukan jeruk keprok. Pengambilan data dilakukan dengan metode langsung dan tidak langsung untuk memperoleh data primer dan data sekunder kemudian dibandingkan antara hasil pengamatan dengan standar kebun. Hasil pengamatan menunjukkan pengelolaan pemupukan jeruk keprok di Afdeling Besaran Kebun Blawan PTPN XII sudah baik dari segi jenis pupuk yang diberikan. Dosis pupuk makro (NPK) dan mikro yang diberikan belum sesuai standar perusahaan, dosis pupuk kandang sudah tepat. Waktu pemupukan pupuk makro (NPK) dan mikro belum sesuai standar perusahaan, waktu aplikasi pupuk kandang sudah tepat. Cara pemupukan pupuk makro (NPK) dan mikro (lewat daun) sudah sesuai standar perusahaan, cara aplikasi pupuk kandang tidak sesuai standar perusahaan karena memperhitungkan efisiensi tenaga kerja.
Keyword: jeruk keprok, pemupukan, dosis pupuk

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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