Judul: Manajemen Panen Kelapa Sawit (Elaeis Guineensis Jacq.) Di Mandah Estate, Pt Bhumireksa Nusasejati, Minamas Plantation, Indragiri Hilir, Riau
Abstrak: Kegiatan magang dilaksanakan di Kebun Mandah, PT Bhumireksa Nusasejati, Minamas Plantation, Kabupaten Indragiri Hilir, Provinsi Riau mulai dari bulan Februari 2015 sampai dengan Juni 2015. Kegiatan magang ini bertujuan untuk mempelajari teknik dan manajemen budidaya kelapa sawit secara umum khususnya pemanenan kelapa sawit. Kegiatan panen di Divisi I Kebun Mandah menggunakan sistem Block Harvesting System non-Division of Labour yaitu program implementasi pengerjaan kegiatan panen yang terkonsentrasi pada satu seksi yang harus diselesaikan dalam satu hari dimana penyelesaian hancak dari potong buah dan kutip brondolan dilakukan sepenuhnya oleh satu pemanen. Secara umum kualitas mutu buah dan mutu hanca di Kebun Mandah sudah baik dengan rasio kehilangan hasil sudah di bawah standar yang telah ditetapkan oleh perusahaan dan rata-rata kematangan buah sudah mencapai standar 95%. Aspek panen yang menjadi kendala yaitu unit angkut buah yang lambat dalam pengangkutan ke pabrik kelapa sawit menyebabkan banyak buah menginap di lapangan.
Keyword: kelapa sawit, manajemen panen, gambut, Kebun Mandah

Judul: Manajemen panen kelapa sawit (Elaeis guineensis Jacq.) pada lahan gambut di Kebun Mandah, PT. Bhumireksa Nusa Sejati, Minamas Plantation, Kabupaten Indragiri Hilir, Provinsi Riau
Abstrak: The harvest management at peatland oil palm plantation is one of the most important factors to reach high fresh fruit bunch (ffb) production. The purpose of this apprenticeship activity was to improve knowledge, ability and work skill of student in order to comprehend in harvest management at oil palm plantation. This apprenticeship took place in Mandah Estate, PT. Bhumireksa Nusasejati, Minamas Plantation, Indragiri Hilir, Riau, from February 2012 to May 2012. Data and information were collected with direct methode and indirect methode. Direct methode was collected by observation and discussion with harvester, foreman, and field assistant. Indirect methode was collected from company data and company record. The harvest activity in Mandah Estate divition 5, uses Block Harvesting System non-Division Of Labour (BHS non-DOL). This system was implementation programs of harvest activity that focus to finished harvest in one section a day. The result of harvest activity in Mandah Estate divition 5 runs well, a shown by good field quality with 0.2 lost fruit per plant, 95.3 % of ripe fruits and 0% unripe fruit. The most obstacle of harvest aspec in Mandah Estate was the transport unit of ffb very slow and caused the uncarry of ffb.
Keyword: 

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.
Keyword: