Judul: Potensi Simpanan Karbon pada Tegakan Revegetasi Lahan Pasca Tambang PT Jorong Barutama Greston, Kalimantan Selatan.
Abstrak: Kegiatan pertambangan menimbulkan hilangnya vegetasi sehingga menyebabkan berkurangnya penyerapan CO2. Kegiatan reklamasi dan revegetasi diharapkan dapat meningkatkan penyerapan CO2. Penelitian ini bertujuan untuk menduga dan membandingkan simpanan karbon yang ada di tegakan revegetasi lahan pasca tambang tahun penanaman 2008, 2009 dan 2010 PT Jorong Barutama Greston. Pendugaan simpanan karbon Acacia mangium dan Paraserianthes falcataria dilakukan dengan menggunakan persamaan alometrik sedangkan untuk serasah dan tumbuhan bawah dengan metode destruktif. Simpanan total karbon tegakan tahun 2008 sebanyak 41.09 ton/ha, tegakan tahun 2009 sebanyak 27.43 ton/ha, dan tegakan tahun 2010 sebanyak 22.90 ton/ha. Hasil analisis vegetasi menunjukkan jumlah spesies tumbuhan bawah yang ada pada tahun 2008 sebanyak 20 spesies, pada tegakan tahun 2009 sebanyak 19 spesies, sedangkan pada tegakan tahun 2010 sebanyak 26 spesies. Hasil uji korelasi Pearson menunjukkan tingkat keanekaragaman jenis tumbuhan bawah tidak berpengaruh terhadap simpanan karbonnya.
Keyword: Acacia mangium, Paraserianthes falcaratia, simpanan karbon, tegakan revegetasi

Judul: Pendugaan Potensi Simpanan Karbon di Atas Permukaan Lahan Pasca Tambang PT. Antam UBPE pongkor, Jawa Barat
Abstrak: Post mining land reclamation is one of the effort to increase carbon stock. Reclamation activities will recover the post-mining degraded lands. The objectives of this study were create an allometric of some tree species, estimate and compare the carbon stock on the land of PT. Antam UBPE Pongkor, West Java in 2001, 2002, and 2003 planting years. Biomass measurement of tree, pole, and sapling was done with non destructive method, while understorey, litter, and necromass was done with destructive method. The allometric which used in this study has the highest R2 value, so that all of allometric can be used for estimate tree’s volume. The result of this study show the highest potential carbon found in 2001 planting years, the potential carbon of this planting year is 107.14 ton/ha, and then 2003 planting years is 101.44 ton/ha, and 2002 planting years is 94.18 ton/hnd a. Carbon potential differences caused by composition, structure, stand density, and canopy coverage
Keyword: Bogor Agricultural University (IPB), PT. Antam UBPE Pongkor, carbon, biomass

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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