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).
Keyword: 

Judul: Manajemen Penunasan Kelapa Sawit (Elaeis guineensis Jacq.) di Sungai Bahaur Estate, PT Windu Nabatindo Abadi, Kalimantan Tengah
Abstrak: This internship was conducted at Sungai Bahaur Estate (SBHE), PT Windu Nabatindo Abadi from March to July 2014. Apprenticeship aims to increase the understanding and skill on technical and managerial aspects of oil palm plantation, especially in pruning management. The observation was conducted on the pruning system, number of leaf frond retained, pruning technique, sex ratio of flower and number of fruit bunches. Pruning was applied according to corrective pruning system. The number of leaf frond which is maintained following the pruning techniques which is applied based on the age of the plant. The sex ratio of flowers are used to estimate the potential of plants to bear fruit. Implementation of pruning at SBHE had not run well according to SOP, several constraints were found such as the low discipline harvesters, lack of supervision, and the absence of strict sanctions.
Keyword: Bogor Agricultural University (IPB), pruning techniques, sex ratio, number of frond

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.
Keyword: