Judul: Growth and Yield of 23 Commercial Sweet Corn (Zea mays saccharata. Sturt)
Abstrak: Keragaan merupakan salah satu tahapan penting dalam pemuliaan tanaman jagung manis sebelum melakukan pelepasan varietas. Evaluasi keragaan dilakukan dengan melihat pertumbuhan untuk mengetahui karakter fenotip dari suatu genotip sehingga bisa diketahui potensi hasil dari suatu varietas. Penelitian terhadap pertumbuhan jagung manis di Indonesia masih terbilang langka sehingga perlu dilakukan penelitian ini dengan tujuan mengetahui pertumbuhan dan daya hasil 23 varietas jagung manis (Zea mays saccharata. Sturt) komersial di Indonesia. Penelitian dilaksanakan di Kebun Percobaan Leuwikopo, Dramaga, Bogor dari bulan Agustus hingga November 2021 menggunakan satu faktor yaitu varietas dengan rancangan kelompok lengkap teracak tiga ulangan. Hasil analisis ragam terhadap 23 varietas jagung manis menunjukkan bahwa genotipe berpengaruh sangat nyata pada karakter tinggi tanaman, tinggi tongkol, umur muncul bunga betina, antesis silking interval, panjang tongkol, padatan terlarut total, daya simpan dan bobot tongkol baik yang berkelobot atau tanpa kelobot, bobot per petak, dan produktivitas tanaman jagung manis. Selain itu, genotipe berpengaruh nyata pada karakter panjang tangkai tongkol dan tidak berpengaruh nyata pada karakter diameter batang, diameter tongkol, dan panjang tongkol berbiji. Varietas dengan produktivitas terbaik ditemukan pada varietas Talenta. Selain itu, pengamatan terhadap masing masing karakter yang diamati menunjukkan keunggulan dan kekurangan dari varietas yang diuji., Performance is one of the important stages in sweet corn breeding before releasing varieties. Performance evaluation is carried out to determine the phenotypic character of a genotype so that the yield potential of a variety can be known. Research on the performance of sweet corn in Indonesia is still relatively rare, so this research needs to be carried out with the aim of knowing the performance and yield of 23 commercial sweet corn varieties (Zea mays saccharata. Sturt) in Indonesia. The study was carried out at the Leuwikopo Experimental Garden, Dramaga, Bogor from August to November 2021 using one factor, namely varieties with a complete randomized group design with three replications. The results analysis of variance on 23 varieties of sweet corn showed that the genotype had a very significant effect on the characters of plant height, cob height, age of female flower emergence, anthesis silking interval, cob length, sweetness level, shelf life and cob weight, both with and without husks. weight per plot, and sweet corn crop productivity. In addition, the genotype had a significant effect on the length of the cob stalk and had no significant effect on the character of the stem diameter, the diameter of the cob, and the length of the seed cob. The varieties with the best productivity were found in the Talenta variety. In addition, observations of each observed character indicate the advantages and disadvantages of the tested varieties.
Keyword: variety, sweet corn, character, performance, productivity

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: 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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