Judul: Penanganan Panen dan Pascapanen Teh Hitam CTC (Camellia sinensis (L.) O.Kuntze) di Kebun Rancabali PTPN VIII Bandung, Jawa Barat
Abstrak: Kegiatan magang dilaksanakan di Kebun Rancabali, PTPN VIII Bandung pada bulan Januari hingga Mei 2021. Kegiatan magang bertujuan untuk meningkatkan wawasan, keterampilan, pengalaman dan memahami proses kerja secara teknis di lapangan dan manajerial pada perkebunan teh, khususnya penanganan panen dan penanganan pascapanen untuk memperoleh mutu yang baik dan produktivitas yang tinggi. Metode yang digunakan pada kegiatan magang yaitu menggunakan metode langsung dan tidak langsung. Hasil magang menunjukkan bahwa isian dan penumpukan waring berpengaruh nyata terhadap penambahan kerusakan pucuk teh. Semakin jauh jarak tempuh truk maka semakin lama waktu yang ditempuh truk. Semakin banyak muatan truk maka semakin banyak juga waring yang dibawa. Kapasitas pemetik mesin, gunting, dan delay life mencapai 149,4 kg HOK¯1, 61 kg HOK¯1, dan 71,72 kg HOK¯1 serta tidak dipengaruhi oleh usia, lama pengalaman kerja, dan jenis kelamin. Tenaga petik gunting, mesin, dan delay life sebanyak 136, 128, dan 30 orang. Rata-rata analisis pucuk memenuhi syarat olah (MS) pada pemetikan mesin dan pemetikan gunting yaitu 51,2% dan 47,9%. Cara pemetikan berpengaruh nyata terhadap persentase MS pucuk. Selisih timbangan kebun dan pabrik yaitu 0,63%. Semakin tinggi analisis pucuk maka semakin sesuai nilai densitas dengan standar. Rata-rata nilai rendemen teh yaitu 23,46%., Internship activity was conducted at Rancabali Estate, PTPN VIII Bandung in January to May 2021. The purpose of internship are increase insight, skills, experience and understand technical and managerial work processes in tea plantations, especially harvest handling and post-harvest handling to obtain quality good and high productivity. The method used in the internship is using direct and indirect methods. The results of the internship showed that the filling and stacking of warings had a significant effect on the increase in damage of tea shoots. The farther the truck travels, the longer the truck travels. The more the truck load, the more waring it carries. Machine picking capacity, scissors, and delay life reached 149.4 kg HOK¯1, 61 kg HOK¯1, and 71.72 kg HOK¯1 and were not influenced by age, length of work experience, and gender. Scissors, machine, and delay life force were 136, 128, and 30 person. The average shoot analysis met the processing requirements (MS) for machine picking and scissor picking, is 51.2% and 47.9%, respectively. The way of picking has a significant effect on the percentage of shoot (MS). The difference between estate and factory scales is 0.63%. The higher the shoot analysis, the more appropriate the density value with the standard. The average value of tea yield is 23.46%
Keyword: harvesting facilities, processing, shoot damage, shoot transportation, shoot quality

Judul: Evaluation of Tea (Camellia sinensis (L.) O. Kuntze) Picking Methods for Producing Green Tea in Negara Kanaan Tea Plantation, Bandung, West Java.
Abstrak: Evaluasi Metode Pemetikan Teh (Camellia sinensis (L.) O. Kuntze) Untuk Memproduksi Teh Hijau di Perkebunan Teh Negara Kanaan, Bandung, Jawa Barat. Dibimbing oleh AHMAD ZAMZAMI dan PURWONO. Kegiatan magang dilaksanakan pada bulan Januari – April 2021 di PT. Ratnapura Bianka. Tujuan kegiatan magang adalah meningkatkan pengetahuan dan pengalaman pada aspek pemetikan daun teh, menambah dan mengembangkan keterampilan dalam budi daya tanaman teh, dan mengevaluasi metode pemetikan teh dalam meningkatkan kualitas dan kuantitas pucuk teh. Metode yang digunakan adalah metode langsung dan tidak langsung. Hasil pengamatan tinggi bidang petik, lebar bidang petik, dan potensi pucuk menunjukkan semakin tinggi umur pangkas, tanaman akan semakin tinggi, bidang petik akan semakin lebar, dan persentase peko menurun. Analisis petik pada pemetikan secara semi-mekanis lebih baik dibandingkan mekanis untuk memperoleh jenis petikan medium. Analisis pucuk yang memenuhi syarat (PMS) pada pemetikan secara semi-mekanis lebih tinggi dibandingkan pemetikan secara mekanis. Gilir dan hanca petik pada areal semi-mekanis lebih cepat dibandingkan dengan areal pemetikan mekanis. Kapasitas pemetik pada pemetikan semi-mekanis lebih sedikit dibandingkan mekanis dan tidak dipengaruhi oleh umur, lama pengalaman kerja, dan gender pemetik. Kekurangan tenaga petik pada areal semi-mekanis lebih sedikit dibandingkan areal mekanis dengan total kekurangan 24 orang. Pertumbuhan pucuk pada areal semi-mekanis lebih cepat dibandingkan areal mekanis. Kata kunci: alat petik, gilir petik, kualitas pucuk, pertumbuhan pucuk, tenaga pemetik, Internship activities carried out in Januari – April 2021 at PT. Ratnapura Bianka. The aim of the internship is to increase knowledge and experience on aspect of tea leaf picking, increase and develop skills in tea cultivation, and evaluate tea picking methods in improving the quality and quantity of tea shoots. The methods used are direct and indirect methods. The results of observations of height, width of the picking area, and the potency of shoots showed that the older the age of the pruning make the plants get taller, the picking area getting wider, and the percentage of peko is decreasing. The shoots analysis on semi-mechanical is better than mechanical for obtaining medium type of picking. The analysis of shoots that qualify (PMS) in semi-mechanical is higher than mechanical. The picking rotation in semi-mechanical is faster than the mechanical. The picking capacity in semi-mechanical is lower than mechanical and is not affected by age, length of work experience, and gender of picker. The shortage of picking power in the semi-mechanical area is lower than the mechanical area with a total shortage of 24 people. Shoot growth in the semi-mechanical area was faster than in the mechanical area. Key words: picking tool, picking rotation, picking power, shoot quality, shoot growth
Keyword: picking tool, picking rotation, picking power, shoot quality, shoot growth

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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