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: Keragaan Karakter Agronomi Beberapa Varietas Jagung (Zea mays L.) Dalam Produksi Jagung Semi
Abstrak: Research was conducted to studied agronomic characters some varieties of maize in baby corn production. In addition, to determinated the varieties that are relatively equal or better than the control. The varieties were consisted of local varieties (Campaloga 2009, Ketip Kuning 2117, Lokal Oesao 3033, and Lokal Srimanganti 3201), introduced varieties (EW DMR Pool C6S2 3325 dan Phil DMR Comp. 2 3423), results of breeding variety (Arjuna 2585), and one of variety hybrid, BISI 2 as a comparison. The researh arranged in a split plot randomized completely block design with two factors and three replications. Character that was had greatest influence in determining the net weight cob of plant/yield were the net weight of cob, number cobs of plant, gross weight cobs of plant, number of rejects cob, cob length, and diameter of cob. Interaction variety and detasseling had significant respons to gross weight of cob for two varieties. They were Lokal Srimanganti 3201 and Arjuna 2585. The results showed that Arjuna 2585 has yield more than BISI 2. Varieties that had the potential of yield characters were Arjuna 2585, Lokal Srimanganti 3201, and Lokal Oesao 3033. In this research, generally detasseling increasing the yield and quality of baby corn.
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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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