Judul: Habitat Characteristics of Rafflesia rochussenii Teijsm. et Binn. in Cimande Resort, Gunung Gede Pangrango National Park
Abstrak: Rafflesia rochussenii is a rare and protected plant species. This species is found in Cimande Resort, Gunung Gede Pangrango National Park, Bogor, West Java. The purpose of this study is to describe the habitat characteristics of Rafflesia rochussenii in Cimande Resort, both biotic and abiotic components, and to explain its management program. The method used is purposive sampling with circular plots with a radius of 17.8 m. Literature study was done to find supporting data. Results identified 57 Rafflesia individuals were found consisting of alive and dead flowers as well as alive and dead buds. The host was Tetrastigma leucostaphylum. The dominating species at the tree, sapling, seedling and undergrowth level were Schima wallihcii, Castanopsis acuminatissima, Aspnlenium nidus, and Cinchona pubescens, respectively. Six species of animals were identified. Rafflesia habitat is found in the altitude of 840-1,360 masl, a slope of 10% -88%, average temperature of 19°C and relative humidity ranging from 80-90%. Soil pH ranges from 5-6.5, soil color is reddish brown to yellow. Leaf Area Index value ranges from 1.85-2.11. Management done by the National Park is inventory and monitoring.
Keyword: abiotic, biotic, habitat, Rafflesia rochussenii

Judul: Pemetaan kesesuaian habitat Rafflesia rochussenii (Teijsm. et Binn.) di resort tapos Taman Nasional Gunung Gede Pangrango
Abstrak: Taman Nasional Gunung Gede Pangrango (TNGGP) mempunyai keanekaragaman tumbuhan yang tinggi, salah satunya adalah Rafflesia rochussenii Teijsm. et Binn. Spesies R. rochussenii termasuk suku Rafflesiaceae yang merupakan tumbuhan holoparasit. Populasi R. rochussenii di TNGGP mengalami penurunan dan keberadaannya semakin terancam apabila tidak dilakukan upaya konservasi. Salah satu kendala upaya konservasi adalah minimnya informasi mengenai distribusi R. rochussenii. Pemetaan kesesuaian habitat dapat menjadi salah satu upaya pemecahan masalah ini. Penelitian ini bertujuan untuk menentukan faktor fisik yang berpengaruh, model dan luas kesesuaian habitat R. rochussenii di Resort Tapos TNGGP.
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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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