Judul: Penggunaan Giberelin dalam Pembibitan Tiga Jenis Pisang (Musa paradisiaca L.)
Abstrak: Permintaan yang besar terhadap buah pisang mendorong produsen pisang untuk mempercepat pertumbuhan tunas pisang. Salah satu caranya adalah menggunakan giberelin. Tujuan penelitian ini adalah mendapatkan tunas pisang terbaik dengan penambahan giberelin pada konsentrasi tertentu dan mendapatkan konsentrasi giberelin terbaik untuk mempercepat pertumbuhan tunas pada ketiga jenis tanaman pisang. Jenis pisang yang digunakan yaitu Ambon, Kepok dan Rajabulu. Empat taraf perlakuan konsentrasi pemberian giberelin yaitu 0 ppm, 10 ppm, 100 ppm, dan 500 ppm. Penelitian disusun dalam rancangan acak kelompok lengkap teracak (RKLT) dua faktor dengan empat ulangan. Peubah yang diamati adalah waktu munculnya tunas, tinggi tunas, jumlah tunas, waktu muncul tunas hingga siap panen, tunas siap panen, dan persentase tunas hidup. Di antara ketiga jenis pisang, pertumbuhan tercepat dari keseluruhan pengamatan adalah pisang Ambon. Pertumbuhan tunas lebih baik tanpa penambahan giberelin
Keyword: banana, gibberellin, seedling, growth

Judul: Penggunaan Giberelin dalam Pembibitan Tiga Jenis Pisang (Musa paradisiaca L.)
Abstrak: High demand of bananas pushes bananas producer for making bananas buds growth faster. One way to achieve that goal was using gibberellin. The aim of this research was to obtain the best banana which growth faster with addition of certain concentration of gibberellin and to obtain the best gibberellin concentrations that accelerate the seedling of three kinds of bananas. Banana used in this research were Ambon, Kepok and Rajabulu. The gibberellin concentrations induced were 0 ppm, 10 ppm, 100 ppm, and 500 ppm. The research compiled randomized complete block design using two factors with four repetition. The observed variables were buds length, number of buds, time of buds emerges, time for maturing buds, number of matured buds, and the percentage of buds live. Gibberellin concentrations didn’t influence the accelerate growth of buds. Among the three kinds of bananas, the fastest buds growth was Ambon banana. The growth of buds was better without gibberellin induction.
Keyword: growth, seedling, gibberellin, banana

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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