Judul: Genetic Diversity of 23 Varieties of Commercial Sweet Corn In Indonesia
Abstrak: Keragaman merupakan faktor penting dalam pemuliaan tanaman karena memengaruhi modal dasar kegiatan pemuliaan tanaman. Informasi mengenai keragaman varietas jagung manis komersial di Indonesia belum ditemukan sehingga perlu dilakukan penelitian ini dengan tujuan mengetahui keragaman genetik 23 varietas jagung manis (Zea mays saccharata. Sturt) komesial 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 penelitian menunjukkan terdapat keragaman tinggi pada karakter daya simpan dan bobot per petak. Analisis kluster membagi 23 varietas menjadi dua kelompok berdasarkan kesamaan terhadap karakter tinggi tongkol, panjang tangkai tongkol, panjang tongkol berbiji, jumlah baris biji, bobot tongkol berkelobot, bobot per petak, dan produktivitas. Varietas dengan nilai karakter terbaik ditemukan pada varietas Golden Boy dan Talenta sehingga dapat dilakukan persilangan terhadap kedua varietas agar mampu memperoleh keturunan dengan karakter yang baik.
Keyword: genetic relationship, heritability, sweet corn, productivity

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: 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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