Judul: Cadangan Karbon Pada Hutan Rakyat Mitra PT. BUMN Hijau Lestari Unit Arjasari Kabupaten Bandung
Abstrak: PT. BUMN Hijau Lestari as a company engaged in the ecobusiness field based sustainable environment need to find out the amount of carbon stock of private forest in Arjasari Unit in order to measure the extent to which the company and the community contribute to the preservation of the environment. Purposive sampling used for data collection toward each household land in 15 KMK Arjasari units for five tree species such as avocado, durian, jabon, jackfruit, and petai. The purpose of this study is to find out the carbon stok estimation using per tree method and midpoint diameter calculation method. The result shows that the biomass, carbon stock, and CO2 sequestration, value, consecutively are 335.90 ton, 154.12 ton, and 565.60 ton. The diameter midpoint calculation method can not be applied for estimation of biomass, carbon stock, and CO2 sequestration in private forest partner of PT. BUMN Hijau Lestari, because it has significant different against value within calculation result using per tree method.
Keyword: CO2 sequestration, calculation method, private forest, carbon stock, biomass

Judul: Pemetaan Stok Karbon Tegakan Hutan Menggunakan Citra Landsat ETM+ di PT. Sarmiento Parakantja Timber Kalimantan Tengah
Abstrak: Besides using the forest production function as wood producer, IUPHHK (forest concession) company has a role to manage the forest ecology function as carbon sink and reservoir. This research was aimed to estimate and make a map of PT. Sarmiento Parakantja Timber natural forest stand carbon stock. This research used a combination of allometric equations (Brown and Ketterings et al.) and remote sensing data. The estimated carbon stock in this research was carbon stock for pole (diameter 10-19 cm) and tree (diameter ≥ 20 cm). The samples taken at 2 places, i.e. outside and inside RKT (annual working plan) 2011, 2012, 2013 forest area. This research showed the average estimated total carbon stock of pole and tree for the outside of those area 229.28 ton/ha by Brown equation and 201.39 ton/ha by Ketterings et al. equation. Inside TPTI (selected logging and Indonesia planting silviculture system) and TPTJ (selected logging and strip planting silviculture system) area of those RKT area, the average estimated total carbon stock of pole and tree 173.68 ton/ha (TPTI) and 124.04 ton/ha (TPTJ) by Brown equation, 167.10 ton/ha (TPTI) and 118.52 ton/ha (TPTJ) by Ketterings et al. equation.
Keyword: remote sensing, forest stand, forest concession, carbon stock, allometric equation

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: