Judul: Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di  Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III
Abstrak: Kegiatan magang dilaksanakan di Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III bertujuan untuk mengetahui dan mempelajari manajemen dan teknis pemanenan kelapa sawit di Kebun Cikasungka. Data pengamatan dianalisis secara deskriptif dan kuantitatif menggunakan persentase dan rata-rata. Manajemen panen kelapa sawit di Afdeling 1 Kebun Cikasungka secara umum sudah berjalan dengan cukup baik terlihat dari beberapa aspek seperti ketersediaan tenaga kerja panen di Afdeling 1 sudah memadai. Rata-rata fruit set sebesar 75,06% dan rata-rata fruit to bunch 69,8%. Beberapa aspek belum optimal sehingga perlu ditingkatkan. Rata-rata kapasitas panen dibawah standar RKAP. Faktor yang paling berpengaruh terhadap kapasitas panen adalah jam kerja karyawan. Produksi harian yang diperoleh masih belum mampu mencapai taksasi produksi dengan persentase terhadap taksasi 82,42%. Penggunaan alat pelindung diri (APD) pemanen pada dua kemandoran belum dilakukan secara maksimal., The internship activities were carried out at Cikasungka Estate, West Java Banten District, under the management of KSO PTPN III. The purpose was to understand and learn the management and technical aspects of oil palm harvesting at Cikasungka Estate. Observation data were analyzed descriptively and quantitatively using percentages and averages. Overall, the oil palm harvesting management in Division 1 of Cikasungka Estate has been operating quite well, as evident from various aspects such as the availability of harvest labor in Division 1, which is sufficient. The average fruit set is 75.06%, and the average fruit-to-bunch ratio is 69.8%. However, there are some aspects that are not optimal and need improvement. The average harvesting capacity falls below the RKAP standard. The most influential factor on harvesting capacity is employee working hours. The daily production obtained has not yet been able to reach the production target, with a percentage of 82.42% of the target. The use of personal protective equipment (PPE) by harvesters in two sectors has not been maximized.
Keyword: personal protective equipment, harvest capacity, production

Judul: Manajemen Pemangkasan Pelepah Kelapa Sawit di Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III
Abstrak: Kelapa sawit (Elaeis guineensis Jacq.) merupakan komoditas perkebunan penyumbang devisa terbesar bagi negara dibandingkan komoditas perkebunan lain seperti karet dan teh. Pemeliharaan pada kelapa sawit perlu diperhatikan untuk menjaga produktivitas tanaman, salah satunya pemangkasan pelepah. Kegiatan magang dilaksanakan di Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III. Kegiatan magang bertujuan meningkatkan pemahaman keterampilan teknis dan manajemen tanaman kelapa sawit, serta mempelajari dan menganalisis kegiatan manajemen pemangkasan pelepah tanaman kelapa sawit di perkebunan. Pengamatan dilakukan pada beberapa aspek mengenai pemangkasan pelepah. Sistem pemangkasan yang diterapkan adalah sistem pemangkasan progresif, yang di Afdeling 1 masih belum terlaksana dengan maksimal. Teknik pemangkasan pelepah yang dilakukan adalah songgo 1 dengan rata-rata di 86,8%.Jumlah pelepah dipertahankan yang sesuai, yaitu 40-48 pelepah memiliki rata-rata 52,17%, di blok A1 mencapai 59,2%, A4 62,1%, dan A12 35,2%. Jumlah bunga dan produktivitas tanaman kelapa sawit berkaitan erat dengan jumlah pelepah yang dipertahankan, semakin sesuai jumlah pelepah dengan peraturan, semakin baik hasil yang didapat., Palm oil (Elaeis guineensis Jacq.) is a plantation commodity that has the largest foreign exchange earner for the country compared to other plantation commodities. Maintenance of oil palm needs to be considered to maintain plant productivity, one of which is pruning. The internship activity was carried out at Cikasungka Gardens West Java District Banten KSO PTPN III. The internship aims to improve the understanding of technical skills and management of oil palm plants, as well as to study and analyze oil palm frond pruning management activities in plantations. Observations were made on several aspects about pruning. Pruning system implemented is pruning progressive system, which in Afdeling 1 has not been implemented optimally. The pruning technique used is songgo 1 with average at 86.8%. The number of fronds that maintained, namely 40-48, in block A1 reached 59.2%, A4 62.1%, and A12 35.2%. The number of flowers and productivity of oil palm plants is closely related to the number of fronds that are maintained, the more in accordance with the number of fronds with regulations, the better the results obtained.
Keyword: Elaeis guineensis Jacq, number of fronds, pruning system, pruning technique, palm oil

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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