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: Performance Evaluation and Power Yield on  11 Hybrids Sweet Corn Genotypes (Zea mays saccharata. Sturt) Breeding Results of IPB University
Abstrak: Informasi keragaan dan daya hasil diperlukan dalam merakit varietas unggul baru. Penelitian ini bertujuan mengevaluasi keragaan dan daya hasil jagung manis hibrida harapan IPB. Penelitian dilakukan pada bulan Desember 2022 sampai Februari 2023 di Kebun Percobaan Leuwikopo, Dramaga, Bogor, Jawa Barat. Penelitian terdiri dari satu faktor yaitu genotipe sebanyak 13 genotipe jagung manis hibrida. Penanaman dilakukan menggunakan rancangan kelompok lengkap teracak dengan 3 ulangan dari 20 tanaman per satuan percobaan. Hasil menunjukkan bahwa terdapat perbedaan keragaan dan daya hasil antar genotipe jagung manis hibrida IPB dan varietas jagung manis pembanding. Genotipe berpengaruh sangat nyata terhadap semua karakter yang diamati, kecuali diameter batang dan anthesis silking interval. Genotipe SB.13B X SM.9.3A.1 dan SB.5.1B.3B X T.13.1.8 memiliki beberapa keunggulan pada karakter seperti produktivitas, bobot tongkol tanpa kelobot, dan anthesis silking interval yang setara atau lebih baik dari varietas pembanding. Kedua genotipe hibrida harapan IPB ini memiliki produktivitas berkisar 19,04-20,42 ton per hektar sedangkan varietas pembanding berkisar antara 21,06-23,71 ton per hektar. Bobot tongkol tanpa kelobot kedua genotipe IPB berkisar 257,33-261,85 gram sedangkan varietas pembanding berkisar antara 249,13-253,53 gram., Information about performance and power yield of sweet corn is needed in assembling new superior varieties. This research aims to evaluate the performance and power yield of the expected hybrid sweet corn from IPB. The research was conducted from December 2022 to February 2023 at the Leuwikopo Experimental Garden, Dramaga, Bogor, West Java. The research consisted of one factor, which was the genotypes of 13 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 power yield among the genotype sweet corn hybrids of IPB and comparison sweet corn varieties. Genotype had a very significant effect on all the characters that observed, except stem diameter and anthesis silking interval. The SB.13B X SM.9.3A.1 genotypes and SB.5.1B.3B X T.13.1.8 genotypes had several advantages of characters such as productivity, ear weight without husk, and anthesis silking interval which were equal or better than the comparison varieties. Genotypes SB.13B X SM.9.3A.1 and SB.5.1B.3B X T.13.1.8 had productivity ranging from 19.04 to 20.42 tons per hectare while comparison varieties ranged from 21.06-23.71 tons per hectare. The ear weight without husk of genotypes SB.13B X SM.9.3A.1 and SB.5.1B.3B X T.13.1.8 ranged from 257.33 to 261.85 grams while comparison varieties ranged from 249.13-253.53 grams.
Keyword: anthesis silking interval, ear weight, evaluation, productivity

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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