Judul: valuasi Karakter Agronomi Beberapa Genotipe Jagung Lokal dan Galur-galur Pemuliaan sebagai Jagung Semi
Abstrak: Corn can be harvested in the form of shelled and of young ears or baby corn. Baby corn varieties in Indonesia are not many at this time, and therefore, development of baby corn varieties is considered potential. This study aimed to evaluate some agronomic characters of local corn and breeding genotypes which are potential to be further developed as baby corn varieties. The experiment conducted at Leuwikopo IPB experimental station at Dramaga, Bogor, from November 2014 to February 2015. The genetic material was consisted of 20 corn genotypes, they were 13 local genotypes and 7 breeding lines. The experimental was arranged in a randomized completely block design with three replication. Traits observed were plant height, stem diameter, number of nodes, day of male flowering, day of female flowering, day first harvest, number of ears per plant, gross weight of ears per plant, net weight of ears per plant, gross weight of ears per fruit, net weight of ears per fruit, ear size (diameter and length), and percentage of marketable and nonmarketable of baby corn ears. The results of analysis of variance showed that there are diversity of corn genotypes tested. High broad sense heritability in all agronomic characters were observed except for gross weight of ears per plant. Linear correlation analysis showed that the earlier the male and female flowering the earlier the days to harvest. Some corn genotypes have more than 2 ear per plant and some showed prolific potential or have several ears in a stem internode. Genotype JWP 2.2, JLP1, G9M7, G1G7. G1M8, and J-CLA 84 have the number of ears per plant more than the other genotypes. Genotype JWP 2.2 has a greater percentage of quality class A than that of Band C, and low percentage of nonmarketable ear. Genotypes potentially developed as baby corn are Bajawa 1.1, JWP 1.2, JWP 2.2, JLP1, G1G7, G1G8, G7M7, and G9M7
Keyword: Bogor Agricultural University, agronomic characters, ear, prolific

Judul: Performance of Corn Genotypes Derived from Selfing and Sibbing to Create Baby Corn Varieties
Abstrak: Jagung semi merupakan tongkol jagung muda yang dipanen sebelum terjadi pembuahan dan memiliki nilai nutrisi tinggi. Produksi jagung semi di Indonesia masih menggunakan varietas jagung pipil maupun jagung manis dikarenakan hanya terdapat satu varietas khusus jagung semi yang telah terdaftar dan dilepas oleh Kementerian Pertanian. Penelitian ini bertujuan menguji beberapa genotipe jagung hasil selfing dan sibbing untuk perakitan varietas jagung semi. Penelitian dilakukan di Kebun Percobaan Cikarawang, IPB, Bogor pada bulan Januari hingga Mei 2021. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Kelompok Lengkap Teracak (RKLT) dengan genotipe sebagai faktor tunggal. Hasil analisis ragam menunjukkan bahwa genotipe berpengaruh terhadap tinggi tanaman, diameter batang, umur berbunga jantan, umur panen, tinggi tongkol pertama, panjang tongkol kotor, dan diameter tongkol bersih. Secara umum perlakuan sibbing menurunkan nilai rerata karakter vegetatif, anthesis silking interval, tinggi tongkol pertama, panjang tongkol bersih, serta meningkatkan persentase tongkol yang termasuk ke dalam kelas ekstra dan kelas I. Genotipe Hawaii Sb-S3 dan Lokal madura Sb-S3 berpotensi untuk dilanjutkan pada perakitan varietas jagung semi karena memiliki tinggi tanaman yang lebih rendah, berpotensi menghasilkan tongkol lebih dari dua per tanaman, dengan persentase tongkol yang termasuk ke dalam kelas ekstra dan kelas I lebih tinggi dari S0.
Keyword: baby corn, performance, prolific, sibbing

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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