Judul: Status Ketahanan Pangan Rumah Tangga dan Peranan Kepemimpinan di Desa Ciaruteun Ilir
Abstrak: Pangan merupakan kebutuhan pokok manusia dan harus dipenuhi. Ada banyak faktor yang berhubungan dengan ketersediaan, akses, distribusi, dan pemenuhan pangan (atau dikenal dengan ketahanan pangan). Pada Di tingkat desa, pemimpin daerah mempunyai peran khusus dalam meningkatkan ketahanan pangan rumah tangga. Dengan demikian, tujuan penelitian adalah untuk mengetahui kompetensi pemimpin yang mampu mendorong masyarakat untuk mencapai ketahanan pangan rumah tangga. Sejumlah 98 dipilih secara sistematis sebagai responden sampel. Pengumpulan data dilakukan pada bulan Juni hingga Juli 2012 di Desa Ciaruteun Ilir. Survei menggunakan kuesioner digunakan untuk mendapatkan data dan informasi terkait. Wawancara semi terstruktur juga dilakukan untuk mendapatkan informasi dari tokoh masyarakat dan tokoh agama. Data dianalisis menggunakan Rank Spearman Korelasi. Hasil penelitian menunjukkan, terdapat korelasi positif antara pangan rumah tangga keamanan dan peran pimpinan daerah (RS= ,281), pendapatan (RS = ,451), pengeluaran (RS=,449), ukuran rumah tangga (RS= -,262), tingkat pendidikan (RS = ,266), dan modal sosial (RS= ,263).
Keyword: The role of leadership, Food security, Rural areasHousehold; Social capital, Household, Social capital

Judul: Pengaruh Modal Sosial Terhadap Ketahanan Pangan Rumahtangga Petani di Desa Ciaruteun Ilir Kecamatan Cibungbulang Kabupaten Bogor.
Abstrak: Social capital is an important component in a community. Social capital is used to help each other when in need, such as the need to secure food sufficiency in a household. Social capital consists of trust, networks, and social norms. Household food security is defined as a condition of food suffiency in one household in terms of availability, accesibility and consumability. This study aims to analyze the roles of social capital in household food security in Ciaruteun Ilir village, Cibungbulang subdistrict at Bogor Regency. The data collection was conducted by using a survey on 60 horticultural farmer houselds. The farmer’s household food security is determined by socio economic level, spending level and the number of household members. Farmers use the capital social to get employed to generate income to buy food.
Keyword: horticultural farmer, food security, Social Capital

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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