Judul: Strategi Pengembangan Usaha Perkebunan Kelapa Sawit pada PT Perkebunan Nusantara 4 Medan Sumatera Utara
Abstrak: Indonesia is an agricultural country, which the agricultural sector is as one of the biggest sector that contribute for the national GDP. Plantation is a part of agricultural sector that has palm oil as one of the biggest commodity of it. The high demand of palm oil from domestic and also abroad is one of the opportunity for many palm oil companies in Indonesia. Therefore, business development strategy is needed to fulfill the high demand of palm oil to catch the opportunity. Internal Factor Evaluation (IFE) and External Factor Evaluation (EFE) Matrix are used to identify internal environment (strength and weakness) and external environment (opportunity and threat) that can be used by top management to make a grand strategy. A grand strategy was obtained by I-E Matrix and SWOT Matrix. Finally the best strategies will be chosen by QSPM (Quantitative Strategies Planning Matrix). The result of the analysis showed that the best strategy for PTPN 4 is increasing the efficiency of production in this palm oil plantation firm.
Keyword: QSPM, SWOT, I-E, EFE, IFE, Analysis strategy, Palm oi, PT Perkebunan nusantara 4

Judul: Strategi Pengembangan Usaha Perkebunan Kelapa Sawit pada PT Perkebunan Nusantara III (Persero) Medan, Sumatera Utara
Abstrak: PT Perkebunan Nusantara III merupakan sebuah perusahaan perkebunan milik negara yang berpusat di Sumatera Utara. Lingkungan usaha perkebunan, terutama kelapa sawit sangat menarik dikarenakan peningkatan permintaan terhadap produk kelapa sawit dan persaingan yang semakin ketat. Maka dari itu diperlukan suatu pengembangan usaha yang sesuai bagi perusahaan. Penelitian ini bertujuan untuk mengidentifikasi faktor-faktor internal dan eksternal perusahaan, memformulasikan alternatif strategi, serta menentukan prioritas strategi yang paling tepat untuk diterapkan oleh PT Perkebunan Nusantara III. Alat analisis yang digunakan adalah matriks IFE, matriks EFE, matriks IE, matriks SWOT, dan matriks QSP. Matriks IFE dan EFE menunjukkan bahwa perusahaan memiliki kondisi internal rata-rata dan kondisi eksternal yang baik. Matriks IE menunjukkan bahwa perusahaan berada pada kuadran kedua. Formulasi alternatif strategi yang dibuat menggunakan matriks SWOT menghasilkan tujuh alternatif strategi. Prioritas strategi yang dihasilkan menggunakan matriks QSP yaitu meningkatkan produktivitas dan kualitas produk pada setiap unit kebun.
Keyword: perkebunan kelapa sawit, IFE, EFE, IE, SWOT, QSPM

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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