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 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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