Judul: Manfaat Ekonomi Agroforestri Pada Pola Yang Berbeda (Studi Kasus Petani Sayuran Program Rehabilitasi dan Konservasi Hulu DAS Ciliwung di Desa Sukagalih, Kecamatan Megamendung, Kabupaten Bogor)
Abstrak: The decrease of the environment quality in the regions of upper and lower of Ciliwung’s Watershed Area led to many losses. Conservation and Rehabilitation program for the upper reaches of the Watershed Area is handled by the Bogor Agriculture and Forestry Department which has been started as early as 2011–2016, aimed to repairing the damage by applying agroforestry between Sengon with the veggie plants which is commonly planted by the farming community. Agroforestry patterns were applied in Sukagalih are divided into two patterns, the first patterns is intercropping planting that apply between Sengon and carrot for all seasons, while the second patterns is intercropping planting that apply between Sengon and carrots or beans or caisim with rolling system in one year. The result of the research showed if there is a difference in the number of vegetables plant cultivation for both of patterns. Also, the results of the research showed the value of the highest eligibility obtained by the first pattern with NPV of agroforestry value amounting to Rp 13 416 760, IRR is 38%, and Net B/C is 3.42. Meanwhile, for the second pattern, the value of NPV is obtained about Rp 10 594 816, IRR is 37%, and Net B/C is 3.30. Based on a comparison of the production and revenue for both of agroforestry patterns in Sukagalih, it can be concluded that the value of productivity and average revenue per year of the second pattern greater than the first pattern. The result indicates, intercropping planting that apply by Sengon with many kinds of vegetables are more profitable than intercropping planting that apply by Sengon with just one kind of vegetable which are constant in the span of one year. Total difference between the two patterns of 53.84% or Rp 5 183 568.
Keyword: Bogor Agricultural University, financial feasibility, planting pattern differences, agroforestry,

Judul: Financial Analysis of Land Use with Agroforestry in Cibeber II Village, Leuwiliang District, Bogor Regency
Abstrak: Pengelolaan pengusahaan hutan rakyat di Desa Cibeber II meliputi pengusahaan tanaman kayu mapun non kayu yang berasal dari hutan rakyat milik pribadi maupun tanah garapan yang dimanfaatkan untuk kesejahteraan dan kebutuhan sehari-hari masyarakat setempat. Tujuan dari penelitian ini memberikan informasi mengenai kelayakan usaha hutan rakyat dari sebagian pola tanam yang terdapat di hutan rakyat Cibeber II. Berdasarkan hasil analisis finansial dengan pola monokultur dan agroforestri layak untuk dikembangkan melalui tiga indikator yaitu NPV, BCR dan IRR. Dari hasil analisis tersebut usaha hutan rakyat dengan pola agroforestri sengon dengan delapan tanaman pengisi lebih menguntungkan dibandingan dengan pola agroforestri sengon dengan tiga tanaman pengisi dan agroforestri sengon, kayu afrika, meranti dan dua tanaman pengisi serta monokultur sengon dengan nilai NPV sebesar Rp478.903.719,00 BCR sebesar 29,15 dan IRR tidak terdefinisi (nilai selalu positif)., The management of community forest in Cibeber II Village includes the exploitation of both timber and non-timber plants originating from privately owned community forests and arable land which are used for the welfare and daily needs of the local community. The purpose of this study is to provide information about the financial feasibility of several cropping patterns found in the Cibeber II community forest. Based on the results of financial analysis, both monoculture and agroforestri patterns are feasible to be developed according to three indicators, namely NPV, BCR and IRR. From the results of the analysis, community forest business with sengon agroforestry pattern with eight filler plants is more profitable than the sengon agroforestry pattern with three filler plants and sengon agroforestri, African wood, meranti and two filler plants and sengon monoculture with an NPV are Rp478.903.719,00 BCR is 29,15 and IRR is undefined (value is always positive).
Keyword: Agroforestry, Cibeber II Village, Financial analysis, Private forests

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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