Judul: Financial Feasibility Study of Straw Mushroom Farming in Bojongmangu Village Subdistrict Bojongmangu of Bekasi
Abstrak: Jamur merang adalah salah satu jamur konsumsi yang memiliki permintaan tinggi, sehingga banyak dikembangkan salah satunya di Desa Bojongmagu. Produksi jamur merang di Desa Bojongmangu memiliki kelemahan, yaitu produksi yang tidak menentu sehingga relatif rentan terhadap faktor lingkungan. Hal ini akan memengaruhi keputusan petani untuk berusahatani, karena tidak diketahui secara pasti kelayakan usahatani. Investasi yang diperlukan juga tidak sedikit dan produksi yang tidak menentu akan memengaruhi kelayakan usahatani. Tujuan dari penelitian ini untuk (1) mengidentifikasi aspek-aspek kelayakan usahatani jamur merang, (2) mengestimasi kelayakan finansial usahatani jamur merang, (3) menganalisis pengaruh penurunan produksi jamur merang, penurunan harga jual jamur merang, dan peningkatan harga kapas terhadap kelayakan usahatani jamur merang. Metode analisis yang digunakan yaitu analisis kelayakan finansial, analisis sensitivitas, dan analisis switching value. Usahatani jamur merang layak untuk diusahakan, karena telah sesuai dengan aspek-aspek kelayakan serta kriteria investasi yaitu NPV, Net B/C, Gross B/C, IRR, dan Payback Period. Penurunan produksi dan harga jual jamur merang segar memberikan dampak paling besar terhadap usahatani jamur merang., Straw mushroom is one of edible mushrooms has a high demand, it is widely developed, one of them in Bojongmagu Village. Productions of straw mushroom in Bojongmangu Village has a weakness, that is erratic production it is relatively vulnerable to environmental factors. This will affect the decision of farmers to farm, because it is not known with certainty the feasibility of straw mushroom farming. The investment required is also not small and uncertain production will affect the feasibility of farming. The purpose of this research for (1) identify feasibility aspects of straw mushroom farming, (2) estimate the financial feasibility study of straw mushroom farming, (3) analyzed the effect of decreasing production of straw mushroom, decreasing selling price of straw mushroom, and increasing the price of cotton on the feasibility study straw mushroom farming. The analytical method is financial feasibility analysis, sensitivity analysis, and switching value. Straw mushroom farming is feasible, because complied with the aspects and investment criteria, that is NPV, Net B/C, Gross B/C, IRR, and Payback Period. The decrease in production and selling price of straw mushroom had the biggest impact.
Keyword: cost-benefit analysis, horticulture, investment criteria, sensitivity analysis, switching value

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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