Judul: Pengelolaan Pemangkasan Teh (Camellia sinensis (L.) O. Kuntze) di Perkebunan Medini, PT Rumpun Sari Medini, Kabupaten Kendal, Jawa Tengah
Abstrak: The internship was conducted at Medini Estate, PT Rumpun Sari Medini, Kendal, Central Java from February until June 2011. Activities performed during the internship is a field worker for one month, as assistant foreman for one month, as assistant chief of the estate for two month. The purpose of the internship is improve knowledge, gain work experience and studying the management aspects of pruning tea, both technical and managerial aspects. Pruning is maintenance activities to rejuvenate the tea plant for increase the production of shoots. Pruning activity of tea in Medini Estate, PT Rumpun Sari Medini, Central Java was good enough.
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Judul: Pemangkasan Tanaman Teh (Camellia sinensis L. (O) Kuntze) di PT Tambi Unit Perkebunan Tambi, Wonosobo, Jawa Tengah
Abstrak: Apprenticeship aims to analyze the management of the tea plant against specific aspects of the cuts and add insight and real work experience. Internship was conducted from February to May 2012 in Plantation Unit Tambi, PT Tambi, Wonosobo, Central Java. The purpose of pruning is to study the management of a good and proper pruning, so as to improve the quality and quantity tea plants. Plantation Unit Tambi using pruning type of production and the type of clipping middle clean. Less time of trimming activities in accordance with the planned time due less of man power of trimmer. The factors that affect the success and accuracy of trimming the plant conditions, in accordance with the type of clipping crop conditions, while proper pruning, proper pruning tools and skills of the workforce. As a result of the lack of proper pruning branches that damage the tea plant, diameter and height fields are not appropriate quotation and shoot growth rate becomes slow causing production to decline. Branch damage is quite high at Block Park caused by the use of the machine tool mechanical pruning cut. Therefore it is necessary for good supervision and coaching skills that are appropriate in order to get good results and proper clipping.
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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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