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: Optimalisasi unit produksi sayuran organik di Yayasan Bina Sarana Bakti, Kecamatan Cisarua, Kabupaten Bogor
Abstrak: Memaksimalkan keuntungan pertanian dapat dilakukan dengan mengatur dan memilih pola tanam yang mementingkan baik teknis dan aspek ekonomi. Tujuan dari penelitian ini adalah untuk menentukan pola tanam optimal sayuran dalam memaksimumkan keuntungan Yayasan Bina Sarana Bakti. Menggunakan model program linier, hasil penelitian menunjukkan bahwa pola tanam optimal untuk Yayasan Bina Sarana Bakti memiliki kombinasi pola tanaman yang berbeda dari kombinasi pota tanaman aktual. Pada kondisi optimal tanpa kendala pasar dan penanaman aktual, maka akan menghasilkan keuntungan 75.28% lebih tinggi daripada pola tanam aktual…
Keyword: Optimalization, Planting Pattern, Profit

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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