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: Potential of Private Forest Stands for Carbon Trading  (Case Study in Leuwibatu Village, Rumpin Subdistrict, Bogor Regency)
Abstrak: Hutan rakyat memiliki peran sebagai penyimpan karbon dan berkontribusi dalam penyerapan karbon. Penelitian ini bertujuan mengetahui praktik agroforestri yang dijalankan, cadangan karbon, kemampuan serapan CO2, dan potensi lahan yang dapat menjadi unit pengelolaan penghasil kredit karbon. Metode pengambilan data menggunakan stratified sampling sebanyak 30 plot ukur yang dipilih secara purposive. Hasil inventarisasi menunjukkan hutan rakyat Desa Leuwibatu termasuk dalam hutan rakyat kebun campuran. Dugaan rata-rata cadangan karbon terbagi pada kelas kemiringan landai sebesar 29,84 tonC/ha, bergelombang sebesar 54,30 tonC/ha, dan berbukit sebesar 64,50 tonC/ha dengan total rata-rata sebesar 49,55 tonC/ha. Dugaan rerata serapan karbon pada kelas kemiringan landai sebesar 6,54 tonCO2/ha/tahun, bergelombang sebesar 8,07 tonCO2 /ha/tahun, dan berbukit sebesar 8,81 ton CO2 /ha/tahun dengan dugaan rata-rata total sebesar 7,81 ton CO2/ha/tahun. Potensi lahan di Kecamatan Rumpin yang dapat dijadikan proyek perdagangan karbon melalui aforestasi/reforestasi seluas 2477 ha (17,80%) dengan potensi serapan karbon sebesar 307.955 tonCO2 selama 20 tahun atau 15.398 tonCO2 /tahun., Private forests have a role as carbon storage and contribute to carbon sequestration. This study aims to determine the agroforestry practices carried out, carbon stocks, CO2 sequestration capability and potential land that has the potential to produce carbon credits. The data collection method used stratified sampling of 30 purposively selected measuring plots. The inventory results show that the Leuwibatu Village private forest is included in the mixed garden private forest. The estimated average carbon stock is divided into gentle slope classes of 29,84 tonsC/ha, undulating of 54,30 tonsC/ha, and hilly of 64,50 tonsC/ha with a total average of 49,55 tonsC/ha. The estimated average carbon uptake in the gentle slope class is 6,54 tonsCO2/ha/year, undulating is 8,07 tonsCO2/ha/year, and hilly is 8,81 tonsCO2/ha/year with an estimated average total of 7,81 tonsCO2/ha/year. The potential land in Rumpin Sub-district that can be used for carbon trading project activities through afforestation/reforestation is 2477 ha (20,53%) with carbon sequestration potential of 307.955 tonsCO2 over 20 years or 15.398 tonsCO2/year.
Keyword: carbon sequestration, carbon stocks, potential land, private forests

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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