Judul: Keragaman genetik kelapa genjah jombang berdasarkan  penanda RAPD (Random Amplified PoIymorphic DNA)
Abstrak: Information of genetic diversity in coconut (Cocos nucifera L.) is necessary to support the breeding programs and germplasm conservation efforts. RAPD is molecular marker can provide to enhance the efficiency of early selection for time consuming of coconut breeding. The objective of this research was to study the genetic diversity of Jombang dwarf coconut populations grown at Pakuwon and Mapanget Coconut Research Station (BALITKA) and at Jombang, and to identify RAPD markers of Genjah Merah Jombang (GMJ), Genjah Kuning Jombang (GKJ), Genjah Hijau Jombang (GHJ), and Genjah Coklat Jombang (GCJ) populations. DNA was amplified using Polymerase Chain Reaction (PCR) and ten random decamer primers. 92% of RAPD markers were polymorphic. Genetic diversity of coconut population in BALITKA was higher than that in Jombang. Genetic diversity within GMJ, GKJ, GHJ, and GCJ populations was 15, 15, 19, and 16% respectively, but among populations was 20%. 750 bp band has been identified from DNA bulk of GCJ coconut using OPA 18 primer. This DNA fragment need to be analyzed further whether could be used as spesific marker for GCJ coconut population.
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Judul: Keragaman genetika tiga kultivar kelapa genjah berdasarkan penanda molekuler random amplified polymorphic DNA (RAPD)
Abstrak: Informasi keragaman genetika dari populasi kelapa koleksi plasma nutfah sangat dibutuhkan untuk usaha konservasi dan perakitan kelapa unggul. Sampai saat ini informasi keragaman genetika dari koleksi kelapa lokal yang dimiliki masih sangat terbatas. Penelitian ini bertujuan untuk mengetahui keragaman genetika antar dan dalam kultivar kelapa Genjah Oranye Sagerat (GOS), Genjah Kuning Bali (GKB), dan Genjah Kuning Nias (GKN) menggunakan penanda molekular Random Amplified Polymorphic DNA (RAPD).
Keyword: Coconut pilar, Random amplified polymorphic, Kelapa genjah

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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