Judul: Feasibility of Hydroponic Business Development in Ijo Sayur Hidroponik Sampang
Abstrak: Ijo Sayur Hidroponik adalah usaha yang bergerak pada budidaya hidroponik sayur dan buah dengan komoditas selada, pakcoy, dan melon. Perusahaan sedang melakukan pengembangan usaha dan dibutuhkan analisis kelayakan bisnis untuk menilai strategi pengembangannya. Analisis studi kelayakan bisnis terdiri dari aspek non finansial (aspek pasar, aspek teknis, aspek manajemen dan hukum, aspek sosial, ekonomi, dan budaya, serta aspek lingkungan) dan aspek finansial (kriteria investasi dan analisis risiko nilai pengganti). Berdasarkan aspek non finansial bisnis layak untuk dijalankan namun untuk budidaya buah (aspek pasar dan teknis) hasilnya cukup layak. Kemudian pada analisis kriteria investasi, bisnis layak untuk dijalankan dengan hasil NPV 81.767.596,33, NET B/C 1,36, IRR 11%, dan PP 9,58. Sedangkan analisis risiko nilai pengganti (switching value), bisnis lebih sensitif terhadap penurunan penjualan sebesar 30,61% dibandingkan kenaikan harga nutrisi sebesar 310,64%.
Keyword: Ijo Sayur Hidroponik, business feasibility studies, non-financial aspects, financial aspects, switching value

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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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