Judul: IPB (Bogor Agricultural University)
Abstrak: Ragam dan peragam genotipik dan fenotipik serta korelaainya untuk berbagai pasangah dari tujuh sifat tanaman sorgua telah diolah dengan sidik ragam dan peragam data individual eerta berbagai jenis kombinasinya dari data gabungan lokaai dsn musim, yang kemudian dilengkapi dengan sidlk gerombol Scott & Knott untuk memungkinkan pemilihan genotipa-genotipa terbaik, khusus hanya untuk sifat hasil biji permalai dan bobot 100-butir biji. Uji kehomogenap ragam galat disertakan pada sidlk ragam gabungap.
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Judul: Evaluation of Agronomic Performance and Yield  Sorghum Breeding lines IPB in Bogor
Abstrak: Sorgum (Sorghum bicolor (L.) Moench) merupakan salah satu tanaman pangan yang berpotensi dikembangkan sebagai tanaman pangan alternatif di Indonesia. Produktivitas sorgum di Indonesia berkisar 2,13 ton ha-1, sedangkan potensi sorgum adalah 4-5 ton ha-1. Peningkatan produktivitas sorgum masih perlu dikembangkan salah satunya dengan pemuliaan tanaman. Tujuan penelitian ini adalah mengevaluasi keragaan karakter agronomi dan daya hasil pada delapan galur harapan sorgum IPB serta mengidentifikasi galur potensial untuk didaftarkan sebagai varietas unggul baru. Penelitian dilaksanakan pada bulan Februari sampai Juli 2022 di Kebun Percobaan Leuwikopo dan Laboratorium Penelitian Pemuliaan Tanaman, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, IPB. Rancangan percobaan yang digunakan adalah rangkaian kelompok lengkap teracak (RKLT) faktor tunggal genotipe. Hasil analisis ragam sebelas genotipe sorgum menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter yang diamati, kecuali pada karakter kadar air bji. Galur uji A-18- 12-7-5, A-19-18-3-8, B-043-16-5-5, C-248-16-5-3-4 dan C-267-18-18-2-7 memiliki keunggulan pada karakter hasil per hektar., Sorghum (Sorghum bicolor (L.) Moench) is a food crops that has developed as an alternatives food crop in Indonesia. Sorghum productivity in Indonesia is 2,13 ton ha-1, while the potential is 4-5 ton ha-1. Increasing the sorghum productivity still needs to be done one of them by plant breeding. The purpose of this research was to evaluate the performent of agronomic and yield on eight promosing lines of sorghum IPB and identify potential lines to be registered as new superior varieties. The research was conducted from February to July 2022 at the Leuwikopo Experimental Field and Plant Breeding Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University. The experimental design used was a randomized complete block design with a single factor is genotype. The result of analysis of varience (ANOVA) of the eleven sorghum genotype showed that the genotype had a significant effect on all observed character, except for the water content character. Lines A-18-12-7-5, A- 19-18-3-8, B-043-16-5-5, C-248-16-5-3-4 and C-267-18-18-2-7 had an advantage on the character of yield per hectare.
Keyword: multilocation, productivity, sorghum, superior varieties

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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