Judul: Keragaan Galur-galur Kacang Bogor (Vigna subterranea (L.) Verdcourt) Hasil Seleksi Galur Murni Lanras Sukabumi
Abstrak: The objective of the experiment was to obtain information the performance of one hundred bambara groundnut lines originated from Sukabumi. The experiment was conducted at Cikarawang Experimental Field, in March-July 2013. Post-harvest handling was conducted at the Experimental Field Leuwikopo in July-August 2013. Experiment used randomized completely block design, single factor with three replications. Differences between genotypes were analyzed by F-test. The results showed that genotype had no significant effect on all variables observed. Mean canopy diameter, number of pods per plant, and weight pods per plant were 45.28 cm, 24 pods, and 28.83 g respectively. Estimated of broad sense heritability (h2bs) of all variables observed were low (<20%).
Keyword: pods, canopy diameter, broad sense heritability

Judul: Seleksi Galur Murni Lanras Kacang Bogor (Vigna Subterranea L.) Asal Sukabumi.
Abstrak: Percobaan ini bertujuan untuk mengevaluasi keragaan karakter agronomi beberapa galur hasil seleksi galur murni dari lanras kacang bogor asal Sukabumi yang memiliki produktivitas tinggi. Percobaan ini dilaksanakan di kebun percobaan (KP) Cikarawang dan KP Leuwikopo Institut Pertanian Bogor pada Desember 2013 hingga Mei 2014. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak dengan 95 galur dan 1 kontrol yang diulang 3 kali. Hasil penelitian menunjukkan bahwa tinggi tanaman, jumlah daun, lebar kanopi, dan bobot brangkasan basah galur-galur berbeda nyata dengan kontrol. Tinggi tanaman memiliki heritabilitas sedang. Semua karakter yang diamati memiliki korelasi positif dengan karakter jumlah polong total kecuali hari berbunga. Seleksi berdasarkan karakter jumlah daun dengan intensitas 10% menghasilkan 10 galur terpilih; yaitu A132.8, A181.6, A45.4, A47.5, A65.10, A86.6, A88.11, R19.7, R38.5, dan R66.2. Seleksi galur berdasarkan karakter jumlah daun mengakibatkan peningkatan nilai kemajuan seleksi pada semua karakter. Nilai tengah karakter populasi terseleksi lebih tinggi dari pada populasi awal, kecuali pada karakter hari berbunga.
Keyword: heritabilitas, kacang bogor, kemajuan seleksi, seleksi

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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