Judul: Evaluasi Investasi pada Modified Production Agroindustri Kopi Bubuk di Bogor
Abstrak: Banyak poduk olahan kopi yang telah dikembangkan, salah satunya adalah kopi bubuk. Kopi bubuk yang diharapkan adalah kopi bubuk dengan hasil seduhan yang tidak memiliki banyak ampas sisa seduhan. Penelitian pendahuluan dilakukan dengan memodifikasi proses pengolahan kopi bubuk. Proses modifikasi tersebut diantaranya pengecilan ukuran biji kopi sebelum disangai. Pada penelitian ini pengolahan kopi bubuk dengan proses yang telah dimodifikasi kemudian dilakukan evaluasi investasi untuk mengetahui kelayakan agroindustri kopi bubuk tersebut. Evaluasi investasi meliputi perhitungan harga pokok produksi, proyeksi laba rugi, investasi yang dibutuhkan, aliran arus kas, serta alat dan mesin yang dibutuhkan dalam skala industri menengah. Kemudian dihitung nilai kriteria investasi, yaitu NPV, B/C Ratio, dan IRR. Bunga Bank yang digunakan dalam perrhitungan adalah 12%. Berdasarkan perhitungan didapatkan hasil nilai NPV sebesar Rp 865 000 000, nilai B/C Ratio sebesar 1.15 dan nilai IRR sebesar 30%. Dengan demikian dapat disimpulkan agroindustri ini layak untuk direalisasikan.
Keyword: Agroindustri, evaluasi investasi, kelayakan investasi, kopi bubuk, produksi modifikas

Judul: Analisis Kelayakan Usaha Pengolahan Kopi pada Kelompok Usaha Bersama Robusta Akur di Kabupaten Temanggung
Abstrak: Coffee plants are one of leading commodities in Temanggung Regency that has not been widely used in off-farm subsystem. The government also pay attention to this industry. Form of government attention such as by forming Kelompok Usaha Bersama then provide investment aid as a stimulus to the Kelompok Usaha Bersama, to run the business. One of business group at Temanggung regency who get help are Kelompok Usaha Bersama Robusta Akur. Assistance given to Kelompok Usaha Bersama a building and a set of coffee processing machines. Feasibility study is required to analyze the coffee processing business investment assistance and machine building. The main aspect is the feasibility in non financial aspects and financial aspects. Consists of non financial aspects are market aspects, technical, management, sosial and environmental. The analysis was also performed on the changes around the business by using a switching value analysis. Switching value to use analyze the maximum change of costs and benefits. The analysis shows the feasibility of investing in the implementation of the coffee processing business. The analysis showed that, the NPV value obtained Rp43 507 123, IRR of 30.16 percent, Net B/C of 1.50; Gross B/C at 1.04, and Payback Period for 8.81 years. In the sensitivity analysis with the value obtained by switching approaches the maximum limit decrease in production by 12.74 percent and an increase in the cost of raw material costs by 29.45 percent. Results of the analysis showed that coffee processing business is sensitive to changes in the amount of production but is not sensitive to changes in raw material costs.
Keyword: switching value, feasibility study, coffee, Kelompok Usaha Bersama, assistance

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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