Judul: Analisis kelayakan investasi pengusahaan paprika dan timun jepang hidroponik pada PT. Horti Jaya Lestari di Kecamatan Berastagi Kabupaten Karo Provinsi Sumatera Utara
Abstrak: Penelitian ini dilakukan di PT Horti Jaya Lestari di Desa Raya J(ecamatao Berastagi Kabupaten Karo Provinsi Sumatera Utara Data yang digunakan dalam peoelitiao ioi terdiri dari data primer dao data sekuoder yang bersifat kuantitatif dan kualitati£ Penelitian ioi akan mengkaji tentang studi kelayakao dengan tujuan agar perusahaan dapat menghiodari kerugian investasi yang memakan dana relatif besar dan lll!tu.k menghindari kerugian dimasa yang akari datang Studi kelayakan yang akan dianaJisis adalah studi kelayakan finansial pengusahaan paprika dan timlll! jepang hidroponik melalui kriteria kelayakan yaitu Net Present Value (NPV), Internal Rate of Return (IRR), Net Benefa-CosJ Ratio (Net 8/C) dan Payback Period (PBP) dan studi kelayakan no,ifinansial meliputi Aspek pasar, aspek tekni.s, aspek manajemen dan aspek sosial. Dari basil anaJisis aspek no,ifinansial PT. Horti Jaya Lestari dilihat dari kriteria aspek pasar layak lllltu.k dilakukan, hal tersebut didasari karena pasar yang dimasuki oleh perusahaan menerima komcxliti yang ditawarkan dan juga berpotensi serta sangat memadai lll!tu.k pemasaran komcxliti. Dari aspek teknis peogusahaan paprika dao timlll! jepang layak lll!tu.k dilakukan, karena sistem budidaya yang dilakukan sesuai baik dari teknologi, lokasi dan juga sistem budidaya Dari aspek manajemen dapat dikaji bahwa PT. Horti Jaya Lestari pada saat ioi sudah memiliki struktur organisasi yang lengkap serta memiliki pembagian kerja yangjelas, usaha ioijuga memberikan dampak yang potitifbagi lingkungan dan daerah usaha melalui dari peoyerapan tenaga kerja maupuo drai segi soisialnya
Keyword: Peppers, Cucumbers Japan, Net Present Value, NPV, Internal Rate of Return, IRR, Net Benefit-Cost Ratio, Net B/C, Payback Periode, PBP

Judul: Analisis Kelayakan Usaha Paprika Hidroponik (Kasus Di Kebun Produksi PT Saung Mirwan, Kecamatan Megamendung, Kabupaten Bogor, Jawa Barat)
Abstrak: Horticulture is one of the agricultural sub-sector has an important role in Indonesian economy. Vegetables has great contribution to GDP from horticultural commodity groups. In 2011, vegetables had the highest growth percentage compared to the other three groups of commodities, which reached 6.06 percent. In 2007-2011, vegetables also had the highest growth percentage of 6.72 percent. One of vegetable commodities that have the potential to be developed is bell peppers. The demand for bell peppers, both in the local market as well as export markets, is higher than the supply. It is a chance to most entrepreneur to start and grown the cultivation of bell peppers. But, the high of investment can be obstruction to run the cultivation of bell peppers. Therefore the feasibility analysis of hydroponic bell peppers is needed to know how much the business can give profit for the entrepreneurs. Firm which has many experiences in the cultivation of bell peppers is Saung Mirwan. The company has been running the bell peppers cultivation since the 1990’s. Therefore, a production farm of Saung Mirwan can be referenced for the entrepreneurs who want to entry the business of bell peppers cultivation. This study is analyzed the cultivation of bell peppers with hydroponic and drip irrigation systems. The purpose of this study was (1) analyzed the non-financial feasibility of the hydroponic bell peppers in Saung Mirwan, (2) analyzed the financial feasibility of hydroponic bell peppers in Saung Mirwan, (3) analyzed the sensitivity of hydroponic bell peppers in Saung Mirwan with changes the decreased in the prices output, declined in the number of bell peppers production, and increased in the price of nutrients. The research was conducted in the production farm of Saung Mirwan from October 2010 until February 2011. This study uses qualitative and quantitative analysis as methods to explain the analysis of non-financial and financial aspects in the business of hydroponic bell peppers. The result of the feasibility analysis indicate that the market, technical, management, social, economic and cultural, and environmental aspect of hydroponic cultivation of bell peppers is feasible. The financial aspects analysis stated the hydroponic bell peppers cultivation is feasible with the value of Rp 9.9 billion of NPV, IRR of 34.18 percent, Net B/C of 3.76, and payback period for 5 years. Switching value analysis results show that the business unfeasible if the bell peppers prices is decreased more than 49.65 percent, the number of bell peppers production decline more than 49.65 percent, and the price of nutrients increased more than 427.90 percent. This shows that the feasibility of hydroponic bell peppers is more sensitive to decreasing price of output and the declining of production rather than increasing in the price of nutrition.
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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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