Judul: Contribution of Agroforestry Community Forests to Farmer's Income in Argapura Village Cigudeg District Bogor Regency.
Abstrak: Kontribusi Hutan Rakyat Agroforestri terhadap Pendapatan Petani di Desa Argapura Kecamatan Cigudeg Kabupaten Bogor. Dibimbing oleh Leti Sundawati. Hutan rakyat agroforestri memiliki manfaat secara ekologi, ekonomi dan sosial. Desa Argapura merupakan salah satu desa di Kecamatan Cigudeg yang memiliki lahan agroforestri yang besar. Penelitian ini bertujuan untuk menghitung kontribusi pendapatan petani dari hutan rakyat agroforestri dan menganalisis karakteristik petani yang memengaruhi pendapatan petani dari sistem agroforestri agar mencapai kesejahteraan petani. Pengambilan data dilakukan melalui wawancara terhadap 30 responden yang dipilih secara convinience sampling. Hasil penelitian menunjukkan bahwa kontribusi hutan rakyat agroforestri sebesar 77,3%. Pendapatan petani lebih besar daripada pengeluaran petani. Namun, setelah dilakukan analisis tingkat kesejahteraan petani, melalui batas garis kemiskinan UMR Kabupaten Bogor 2024, sebanyak 66,7% petani mempunyai pendapatan agroforestri dibawah batas garis kemiskinan dan sebanyak 13,3% petani berada di bawah batas garis kemiskinan berdasarkan garis kemiskinan Kabupaten Bogor. Karakteristik petani yang memengaruhi pendapatan menurut korelasi rank spearman yaitu usia, lama bertani, luas kepemilikan lahan dan pendidikan. Semakin besar nilai korelasi koefisien semakin besar juga pengaruhnya kepada pendapatan agroforestri. Kata kunci: Agroforestri, kayu, kesejahteraan, kontribusi, pendapatan, Contribution of Agroforestry Community Forests to Farmers' Income in Argapura Village Cigudeg District Bogor Regency. Supervised by Leti Sundawati. Agroforestry community forests have ecological, economic, and social benefits. Argapura Village is one of the villages in Cigudeg District, which has a large agroforestry area. The research aims to calculate the contribution of farmers' income from agroforestry community forests and analyze farmer characteristics that influence farmer income from agroforestry systems to achieve farmer welfare. Data collection was carried out through interviews with 30 respondents selected using convenience samplingThe research results show that the contribution of agroforestri community forests is 77.3%. Farmers' income is higher significant than farmers' expenses. However, after analyzing the level of welfare of farmers after analyzing the level of welfare of farmers based on the 2024 Bogor Regency UMR poverty line, 66.7% of farmers have agroforestry income below the poverty line, and 13.3% of farmers are below the poverty line based on the poverty line. Poverty in Bogor Regency. Farmer characteristics can affect income according to Spearman's rank correlation are age, years of farming, size of land ownership and education.. The greater the correlation coefficient value impact to agroforestry income. Keywords: Agroforestry, contribution, income, timber, welfare
Keyword: hutan rakyat agroforestri, Agroforestry, contribution, income, timber, welfare

Judul: Kontribusi Pengelolaan Agroforestri Terhadap Pendapatan Rumah Tangga Petani (Studi Kasus Di Desa Sukaluyu, Kecamatan Nanggung, Kabupaten Bogor, Jawa Barat)
Abstrak: Agroforestry is a land use system which combines woody plants with agricultural crops. Various previous researches concluded that agroforestry can improve the household income of farmers. Sukaluyu Village became one of the villages that make agroforestry as a source of their economy. The research was conducted to provide information regarding the contribution of agroforestry management to the farmer households as well as information about the agroforestry system adopted by local farmers. The results of research showed that farmers implement agroforestry system who combined trees with crops and trees with medicinal plants in which land management with agroforestry systems contribute to farmer household income was 68.60%.
Keyword: revenue, contribution, agroforestry, Bogor Agricultural University (IPB)

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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