Judul: Pengaruh media arang sekam terhadap pertumbuhan semai ficus callosa willd (pangsar)
Abstrak: Ficus terbagi menjadi 3 golongan yaitu epifit, semi epifit dan pohon. Ficus callosa Willd (Pangsar), famili Moraceae merupakan salah satu jenis diantara ratusan jenis Ficus yang terdapat di dunia yang dapat hidup langsung dari tanah dan merupakan jenis yang belum banyak dipelajari dari segi silvikultur dan kegunaannya (lesser-known species). Pemanfaatan Ficus pada umumnya hanya sebagai tanaman pelindung karena beberapa jenis Ficus mempunyai tajuk yang besar dan dipercaya oleh sebagian masyarakat sebagai sumber air. Pemanfaatan kayu Ficus untuk kayu perkakas belum banyak dikerjakan. Hal ini dikarenakan kayu Ficus mempunyai kelas awet yang rendah (kelas IV) dan kelas kuat yang rendah sehingga tidak banyak dimanfaatkan sebagai kayu perkakas yang pada umumnya mempunyai kelas awet dan kelas kuat yang tinggi.
Keyword: arang sekam, pangsar

Judul: Pengaruh Komposisi Media Tanam Terhadap Pertumbuhan Stek Batang Tanaman Ara (Ficus carica L).
Abstrak: The aimed of this study was to find the best plant media for the growth of fig cuttings. The experiment was conducted in July to October 2012 at Leuwikopo Experimental Farm, Bogor Agricultural University, Indonesia. The experiment was arranged in Randomized Complete Block Design with plant media compotition as the treatment and four replications. The plant media consisted of soil, rice hull charcoal, and goat manure (2:1:1); soil, bamboo leaves compost and rice hull charcoal (2:1:1); cocopeat and bamboo leaves compost (1:1);rice hull charcoal, goat manure and bamboo leaves compost (1:1:1). The result showed that the plant consisted of soil, rice hull charcoal, and goat manure; soil, bamboo leaves compost and rice hull charcoal; and rice hull charcoal, goat manure and bamboo leaves compost gave the same performance in fig cuttings of life percentages, that were 65.5, 70.0 and 65.0%, whereas plant media consisted of cocopeat and bamboo leaves compost gave the lowest result of 37.5%.
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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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