Judul: Performance Various Breeding Line of Sweet Corn (Zea mays saccharata Sturt) IPB Collection
Abstrak: Varietas hibrida yang berasal dari hasil persilangan dua galur atau lebih merupakan salah satu upaya peningkatan produksi jagung manis. Oleh karena itu, informasi tentang keragaan dari suatu galur jagung manis penting dalam perakitan varietas hibrida jagung manis. Penelitian ini bertujuan untuk mengevaluasi keragaan berbagai galur jagung manis koleksi IPB. Penelitian ini dilaksanakan dari bulan November 2022 hingga Februari 2023 di Kebun Percobaan IPB Leuwikopo, Dramaga, Bogor, Jawa Barat. Penelitian terdiri dari satu faktor yaitu 15 galur jagung manis. Penanaman dilakukan menggunakan rancangan kelompok lengkap teracak dengan 3 ulangan sehingga terdapat 45 satuan percobaan. Hasil penelitian menunjukkan terdapat perbedaan keragaan antar galur jagung manis. Genotipe berpengaruh sangat nyata terhadap semua karakter kecuali diameter batang dan anthesis silking interval (ASI). Genotipe T13.1.8.16, SB8.4.3, SM1.1.9, SM12.2.13, dan SB5.1B.3B.1 potensial digunakan sebagai tetua hibrida karena memiliki beberapa keunggulan pada karakter yang diamati seperti produktivitas, padatan terlarut total, serta anthesis silking interval (ASI). Genotipe SM1.1.9 dan T13.1.8.16 menghasilkan produktivitas tertinggi yaitu 16,41 ton ha-1 dan 14,97 ton ha-1. Genotipe SB8.4.3 menghasilkan padatan terlarut total (PTT) tertinggi sebesar 16,50 obrix. Anthesis silking interval (ASI) tertinggi terdapat pada oleh genotipe SM1.1.9. Genotipe SM12.2.13 dan SB5.1B.3B.1 menghasilkan panjang tongkol, jumlah bij per baris, dan ukuran biji tertinggi., Hybrid varieties derived from the crossing of two or more strains are one of the efforts to increase sweet corn production. Therefore, information on the performance of a sweet corn breeding line is important in the assembly of sweet corn hybrid varieties. This study aimed to evaluate the performance of various sweet corn breeding line from the IPB collection. The research was conducted from November 2022 to February 2023 at IPB Leuwikopo Experimental Farm, Dramaga, Bogor, West Java. The study consisted of one factor, 15 sweet corn breeding line. Planting was done using a RKLT design with 3 replications so that there were 45 experimental units. The results showed that there were differences in performance between sweet corn breeding line. Genotype had a very significant effect on all characters except stem diameter and anthesis silking interval (ASI). Genotypes T13.1.8.16, SB8.4.3, SM1.1.9, SM12.2.13 and SB5.1B.3B.1 have the potential to be used as hybrid parent because they have several advantages in the observed characters such as productivity, total soluble solids, and anthesis silking interval (ASI). Genotypes SM1.1.9 and T13.1.8.16 produced the highest productivity of 16.41 ton ha-1 and 14.97 ton ha-1. Genotype SB8.4.3 produced the highest total soluble solids (TSS) at 16.50 obrix. Anthesis silking interval (ASI) was highest in genotype SM1.1.9. Genotypes SM12.2.13 and SB5.1B.3B.1 produced the highest cob length, number of seeds per row, and seed size.
Keyword: Character, Cob Storability, Evaluation, Genotype

Judul: Performance Evaluation and Yield Power of Hybrid Sweet Corn (Zea mays var. saccharata Sturt.)
Abstrak: Informasi keragaan dan daya hasil sangat penting dalam kegiatan pemuliaan tanaman. Penelitian ini bertujuan mengevaluasi keragaan dan memperoleh informasi daya hasil jagung manis hibrida hasil pemuliaan IPB. Penelitian dilaksanakan pada bulan November 2022 sampai Februari 2023 di Kebun Percobaan Leuwikopo, Dramaga, Bogor, Jawa Barat. Penelitian terdiri dari satu faktor yaitu genotipe sebanyak 14 genotipe jagung manis hibrida. Penanaman menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan dimana setiap satuan percobaan terdiri atas 20 tanaman. Hasil penelitian menunjukkan bahwa terdapat perbedaan keragaan dan daya hasil antara genotipe jagung manis. Umur panen, padatan terlarut total dan produktivitas hibrida SM 9.3A.1 x T13.1.8, hibrida SB 13.1.3B x SM.9.3A.1, hibrida SB 13.1.3B x SM 12.1.5B, hibrida SB 5.1B.3B x T13.1.8, dan hibrida SB5.1B.3B x SM9.3A.1 setara atau lebih baik dari varietas pembanding. Lima genotipe hibrida jagung manis IPB ini memiliki umur panen berkisar antara 65-71 HST sedangkan varietas pembanding berkisar antara 70-71 HST. Padatan Terlarut Total (PTT) lima hibrida uji IPB berkisar antara 14,38-14,93 0brix sedangkan varietas pembanding berkisar antara 13,52-14,67 0brix. Produktivitas lima hibrida uji IPB berkisar antara 10,76-13,41 ton per hektar sedangkan varietas pembanding berkisar antara 12,72-16,02 ton per hektar., The Information about performance and yield power is crucial in plant breeding activities. This research aims to evaluate the performance and obtain information on the yield power of hybrid sweet corn breeding results from IPB. The research was conducted from November 2022 to February 2023 at the Leuwikopo Experimental Garden, Dramaga, Bogor, West Java. The research consisted of one factor, which was the genotypes of 14 hybrid sweet corn genotypes. Planting was done using a randomized complete group design with three repetitions where each experimental unit consists of 20 plants. The results showed that there were differences in performance and yield power among the sweet corn genotypes. The harvest age, total dissolved solids and productivity of SM 9.3A.1 x T13.1.8 hybrid, SB 13.1.3B x SM.9.3A.1 hybrid, SB 13.1.3B x SM 12.1.5B hybrid, SB 5.1B.3B x T13.1.8 hybrid, and SB5.1B.3B x SM9.3A.1 hybrid were equivalent or better than the comparison variety. The five hybrid sweet corn genotypes from IPB had a harvest age ranging from 65-71 HST while comparison varieties ranged from 70-71 HST. The Total Dissolved Solids (PTT) of the five IPB test hybrid ranged from 14.38-14.93 0brix while comparison varieties ranged from 13.52-14.67 0brix. The productivity of the five IPB test hybrid ranged from 10.76-13.41 tons per hectare, while the comparison varieties ranged from 12.72-16.02 tons per hectare.
Keyword: character, hybrid, performance, plant breeding, sweet corn

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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