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: Pengelolaan Pemetikan Teh (Camellia sinensis (L.) O. Kuntze) di Unit Perkebunan Tambi, PT Tambi, Wonosobo, Jawa Tengah
Abstrak: The objectives were to improve the understanding, to analyze tea management aspect which is related to tea plucking, and to improve the technical skills of tea plantation. This field practice was conducted on February 2012 to May 2012 at Unit Perkebunan Tambi, PT Tambi which is located in Wonosobo, Central Java. The major purpose on tea management is to study of truly tea plucking management. Plucking tea management is influenced by growth of tea pecco, hight of pluck area, and thick of maintenance leaf. The growth of tea pecco and hight of pluck area have a certain relation with plucking capacity, and thick of maintenance leaf. A good supervision will improve skill of plucker and produce peccos which match with standard of tea management.
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Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model