Judul: Palm Oil (Elaeis guineensis Jacq.) Harvesting Management at PT Kalianusa, East Kutai, East Kalimantan
Abstrak: Kelapa sawit merupakan tanaman perkebunan penghasil devisa negara yang berperan penting dalam perekonomian Indonesia. Selain penguatan devisa, sektor perkebunan sawit juga salah satu sektor yang membutuhkan tenaga kerja yang cukup banyak. Upaya dalam peningkatan produksi dan produktivitas kelapa sawit dapat dilakukan dengan perbaikan manajemen produksi melalui kegiatan pemanenan yang baik. Kegiatan magang dilaksanakan di PT Kalianusa, Kutai Timur, Kalimantan Timur bertujuan untuk mengamati perencanaan, pelaksanaan, pengorganisasian, dan evaluasi panen. Data pengamatan dianalisis secara kuantitatif lalu uji komparasi menggunakan t-student pada taraf 5 % untuk dibandingkan dengan norma baku. Kegiatan pemanenan di PT Kalianusa berjalan cukup baik, persiapan panen yang terstruktur, cara panen yang baik dan taksasi produksi dengan selisih rata-rata di bawah 5 %. Walaupun demikian beberapa hal masih perlu diperbaiki dan ditingkatkan seperti nilai sortasi panen yang rendah dan penggunaan APD yang belum maksimal., Oil palm is a foreign exchange-earning plantation crop that plays an important role in the Indonesian economy. In addition to strengthening foreign exchange, the oil palm plantation sector is also one of the sectors that requires quite a lot of labor. Efforts to increase oil palm production and productivity can be done by improving production management through good harvesting activities. The internship was conducted at PT Kalianusa, East Kutai, East Kalimantan to observe harvest planning, implementation, organization, and evaluation. Observational data was analyzed quantitatively and then a comparative test using t-student at the 5% level to be compared with the standard norm. Harvesting activities at PT Kalianusa are running quite well, structured harvest preparation, good harvesting methods, and estimated production with an average difference below 5%. However, some things still need to be improved and increased such as the low harvest sorting value and the use of PPE that has not been maximized.
Keyword: harvest estimation, harvest evaluation, harvest management

Judul: Harvesting Management of Oil Palm (Elaeis guineensis  Jacq.) in Utara Petapahan Plantation, PT Peputra Masterindo, Kampar, Riau.
Abstrak: Kelapa sawit merupakan salah satu komoditas perkebunan penting sebagai sumber pemasukan devisa Negara Indonesia. Keberhasilan panen akan menunjang peningkatan produktivitas tanaman sehingga kegiatan pemanenan kelapa sawit merupakan salah satu kegiatan yang penting dalam pengelolaan perkebunan kelapa sawit. Kegiatan magang dilaksanakan di Kebun Utara Petapahan, PT Peputra Masterindo, Kampar, Riau pada tanggal 18 Januari hingga 17 Mei 2021. Kegiatan magang memiliki tujuan untuk menambah pengetahuan, memperoleh pengalaman, dan keterampilan kerja tentang budidaya kelapa sawit dengan aspek khusus yang diamati tentang manajemen pemanenan kelapa sawit. Aspek khusus yang diamati meliputi perencanaan panen, pelaksanaan panen, dan evaluasi panen. Data pengamatan dianalisis secara kuantitatif dan deskriptif dengan menggunakan rata rata, persentase, serta uji komparasi (t-student). Kegiatan pemanenan di Kebun Utara Petapahan sudah berjalan cukup baik, terlihat dari hasil produksi harian yang sesuai dengan taksasi produksi dengan nilai varian rata-rata di bawah 5% dan muatan panen pada alat truk yang sudah sesuai kapasitas. Walaupun demikian beberapa hal masih perlu diperbaiki dan ditingkatkan seperti rotasi panen yang masih panjang, pengadaan alat pelindung diri (APD) kaca mata dan kepatuhan dalam penggunaan helm yang masih dibawah angka 100%, mutu buah busuk yang sudah diatas standar sebesar 1,69% dari batas toleransi 1% , kapasitas pemanen rata-rata masih belum mencapai basis panen, kehilangan hasil berupa berondolan yang tidak terkutip dan buah matang tidak dipanen masih ditemukan pada saat pemeriksaan hanca., Oil palm is one of the important plantation commodities as a source of income for Indonesian. The successful harvest will support to increased the productivity, so oil palm harvesting is an important activity in management of oil palm plantations. Internship was held at Utara Petapahan Plantation, PT Peputra Masterindo, Kampar, Riau from January 18th until May 17th 2021. The internship activity aims to increase knowledge, gain experience and work skills about oil palm cultivation with specific aspects observed about harvest management of oil palm. Specific aspects that were observed included harvest planning, harvest implementation, and harvest evaluation. Observation data were analyzed quantitatively and descriptively using averages, percentages, and a comparative test (t-student). Harvesting activities in Utara Petapahan plantation have been running quite well, as seen from the daily production results in accordance with production estimates with an average variant value of below 5% and the fruit transportation with trucks are compatible with capacity. However several things still need to be improved such as harvesting rotation which is still long, procurement of personal protective equipments (PPE) for glasses and compliance with helmet use which is still below 100%, the quality of rotten fruit that has been above the standard is 1.69% of the tolerance limit 1%, average harvesting capacity is still has not reached the basis of harvest, lost yields have been found from not collected fruit and ripe fruit that wasn’t harvested are still found during the region inspection.
Keyword: capacity harvester, harvesting management, harvest planning, oil  palm, capacity harvester, harvesting management, harvest planning, oil palm

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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