Judul: Analisis Kelayakan Pengembangan Usaha Budidaya Buah Naga (Hylocereus sp.) di Desa Rombasan Kecamatan Pragaan Kabupaten Sumenep Jawa Timur
Abstrak: Dragon fruit is a fruit which has a potential to be developed because it has a high economic value and unfullfilling demand. The fullfilling of dragon fruit needs is still an import result. One of the way to decrease an import is the development of dragon fruit cultivation. Mr. Muhlis Hidayat is a farmer who has begun cultivating dragon fruit since 2006. The increasing of demand is a market potential for farmer so that it is necessary to do business development by adding investments. The capital which is needed to develop this business is big enough so that it needs a feasibility study to determine business feasibility. The data analysis methods which is used are qualitative which used to analyze the non financial aspect feasibility and quantitative which used to analyze the financial aspect feasibility. Every business has its own risk and uncertainty so that sensitivity and switching value analysis is needed to be done to determine the feasibility limit. The research result showed that the dragon fruit cultivation of Mr. Muhlis Hidayat is feasible to be done and developed
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Judul: Analisis kelayakan finansial budidaya jamur merang (Volvariella volvaceae) (studi kasus usaha agribisnis putra hasan mushroom di kecamatan Karang Bahagia, Bekasi, Jawa Barat)
Abstrak: Di Indonesia jamur merang maupun jamur lain merupakan komoditas pertanian yang memiliki prospek sangat baik untuk dikembangkan, baik untuk ekspor maupun untuk mencukupi permintaan pasar dalam negeri yang terus meningkat. Masyarakat sudah mulai mengerti akan nilai gizi jamur. Untuk budidaya jamur hanya dibutuhkan ketelitian dan modal yang tidak terlalu besar, tetapi nilai ekonominya cukup tinggi sehingga masyarakat tertarik untuk melakukan budidaya jamur merang. Salah satu masyarakat yang tertarik dan kemudian merealisasikan untuk melakukan budidaya jamur merang adalah Putra Hasan Mushroom.
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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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