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 Pemupukan Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Cikasungka KSO PTPN III Distrik Jawa Barat Banten
Abstrak: Salah satu faktor yang mempengaruhi produksi crude palm oil adalah kegiatan pemupukan. Magang bertujuan mengetahui manajemen pemupukan kelapa sawit di perkebunan milik negara dan memahami kondisi lapangan. Kegiatan magang dilaksanakan pada Februari-Juni 2023 di Kebun Cikasungka Distrik Jawa Barat Banten Kerja Sama Operasional (KSO) PTPN III. Magang dilakukan dengan menjadi karyawan harian lepas (KHL), pendamping mandor, dan pendamping asisten afdeling. KHL melakukan semua aspek teknis di kebun, pendamping mandor membantu pengawasan pekerja dan aspek teknis, serta pendamping asisten afdeling membantu terkait aspek manajerial. Pengambilan data primer pada blok A2, A3, dan A4 selama 5 hari dilakukan dengan mengamati KHL pemupukan berkaitan takaran pupuk pokok-1 (320 unit pengamatan), jarak taburan terhadap pangkal pokok (320 unit pengamatan), alat yang digunakan (20 unit pengamatan), metode aplikasi pupuk (320 unit pengamatan), dan dosis tandan kosong ha-1 (blok A1 dengan 3 ulangan) serta mengamati mandor berkaitan kehadiran selama pemupukan. Data sekunder ketepatan waktu pemupukan diambil dari laporan perusahaan 2017-2023. Hasil pengamatan menunjukkan bahwa pelaksanaan pemupukan belum berjalan optimal. Perolehan ketepatan aplikasi dosis pupuk dan jarak aplikasi NPKMg 13.6.27.4 memiliki persentase 128% dan 39,03%. Waktu pemupukan NPKMg di Afdeling 1 memiliki ketepatan 66,7%. Alat pemupukan dan cara aplikasi memiliki kesesuaian 100%. Kehadiran mandor memiliki persentase 100%., Fertilization can affect crude palm oil production. The internship aims to know the management of oil palm fertilization in owned state plantations and understand field conditions. Internship activities were carried out in February- June 2023 at the Cikasungka Plantation. The internship is carried out by becoming a KHL perform all technical aspects, a foreman assistants help supervise workers, and a field assistant assistants help with managerial aspects. Primary data on blocks A2, A3, and A4 for 5 days was obtained by observing KHL related to the rate of fertilizer stand-1 (320 observation units), the distance of fertilizer to the stem base (320 observation units), the tools used (20 observation units), the method of fertilizer application (320 observation units), and the dose of empty bunches ha-1 (block A1 with 3 replications), and observing the foreman attendance during fertilization. Secondary data for fertilization timeliness was taken from the company report 2017-2023. Observations showed that the implementation of fertilization had not been optimal. The accuracy of fertilizer dose application and application distance of NPKMg 13.6.27.4 was 128% and 39.03%. The timing of NPKMg fertilization in Afdeling 1 had 66.7% accuracy. Fertilization tools and application methods had 100% conformity. The foreman attendance had 100% percentage.
Keyword: dose, fruit set, fruit to bunch, foreman, NPKMg

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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