Judul: Fenologi Perbungaan Kerumbai Merah (Sarcotheca macrophylla) di Kebun Raya Bogor
Abstrak: Sarcotheca macrophylla yang dikenal dengan nama kerumbai merah adalah tanaman endemik Kalimantan, yang termasuk ke dalam salah satu anggota famili Oxalidaceae. Pada umumnya, buah dari S. macrophylla dapat dikonsumsi langsung dalam kondisi segar, juga dapat digunakan sebagai sampo oleh orang – orang Kutai Barat. Informasi tentang S. macrophylla yang diketahui sampai saat ini, hanya terbatas pada deskripsi morfologi dan persebarannya. Di sisi lain, pemanfaatan S. macrophylla di alam masih dilakukan secara liar, untuk itu diperlukan upaya konservasi. Tujuan penelitian ini ialah menganalisis fenologi perbungaan S. macrophylla yang meliputi aspek – aspek yaitu fase – fase dan waktu periode perbungaan, faktor lingkungan yang mempengaruhi perbungaan, serta tahapan perubahan morfologi perkembangan bunga S. macrophylla. Sarcotheca macrophylla memiliki waktu inisiasi infloresen selama 30 hari, fase kuncup kecil 6 hari, fase kuncup besar 12 hari, fase antesis 1 – 2 hari, dan perkembangan buah selama 36 – 40 hari. Serangga pengunjung yang dominan adalah Trigona leaviceps. Faktor abiotik yang mendukung pembungaan adalah suhu udara.
Keyword: S. macrophylla, fenologi, faktor biotik dan abiotik

Judul: Pertumbuhan Bakau Merah (Rhizophora mucronata) di Persemaian Mangrove Desa Muara, Kecamatan Teluk Naga, Kabupaten Tangerang
Abstrak: The success of mangrove rehabilitations are influenced by various factors which one of them is the availability of seedling stocks over time. The knowledge about growth process and development of plants which will be used as seedlings are several factors of success of nursery development. Red mangrove (Rhizophora mucronata) is one species of plants which grows in mangrove forest. The conservation of this species is very important because its habitat is at the central zone of mangrove formation and has high reproduction over time so it can be easier to do rehabilitation. The aim of this research is to get the information about R.mucronata growth and development to get better cultivation technique. The treatments were planting of propagul that had pieces of fruit and planting of propagul without pieces of fruit. Based on this research, the planting of propagul without pieces of fruit gave significant effect toward the heigth and length of red mangrove (R.mucronata) propagules development.
Keyword: Rhizophora mucronata, propagul, nursery, growth

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.
Keyword: