Judul: Estimation of Biomass, Carbon Stock and CO2 Absorption of Pine Stands (Pinus merkusii) in Various Age Classes at RPH  Sugihan, KPH Kediri
Abstrak: Meningkatnya emisi CO2 di udara membuat berbagai pihak merasa perlu mengukur kandungan karbon dioksida (CO2) secara berkala. Salah satu faktor yang dapat mengurangi peningkatan karbon dioksida di atmosfer adalah penyerapan oleh vegetasi. Hutan memiliki kemampuan untuk menyerap karbon dan mengontrol pelepasannya ke udara dengan bantuan sinar matahari dan air dari dalam tanah melalui proses fotosintesis. Tujuan penelitian ini yaitu untuk menduga biomassa, simpanan karbon, dan serapan CO2 pada berbagai kelas umur tegakan pinus (Pinus merkusii) di RPH Sugihan, KPH Kediri. Metode yang digunakan dalam pengambilan data, menggunakan stratified sampling dengan plot lingkaran berukuran 0,02 ha untuk KU I, 0,04 ha untuk KU III dan IV, 0,1 ha untuk KU V ke atas sebanyak 103 plot. Analisis data pendugaan biomassa menggunakan persamaan allometrik. Biomassa, simpanan karbon, dan serapan karbon dioksida (CO2) diperoleh dari konversi nilai biomassa. Hasil penelitian menunjukan pendugaan biomassa 127,09 ton/ha, simpanan karbon 65,54 ton/ha, dan serapan CO2 232,99 ton/ha., The increasing CO2 emissions in the air make various parties feel the need to measure the carbon dioxide (CO2) content periodically. One factor that can reduce the increase in carbon dioxide in the atmosphere is absorption by vegetation. Forests have the ability to absorb carbon and control its release into the air with the help of sunlight and water from the soil through the process of photosynthesis. The purpose of this study was to estimate biomass, carbon stock, and CO2 absorption in various age classes of pine stands (Pinus merkusii) at RPH Sugihan, KPH Kediri. The method used in data collection used stratified sampling with circle plots measuring 0,02 ha for KU I, 0,04 ha for KU III and IV, 0,1 ha for KU V and above as many as 103 plots. Analysis of biomass estimation data using allometric equations. Biomass, carbon stock, and carbon dioxide (CO2) uptake are obtained from the conversion of biomass values. The results showed an estimated biomass of 127,09 tons/ha, carbon stock of 65,54 tons/ha, and CO2 absorption of 232,99 tons/ha.
Keyword: biomass, carbon stock, carbon dioxide, Pinus merkusii

Judul: Estimation of Biomass, Carbon Stock, and CO2 Uptake in Various Age Classes of Teak Stands in RPH Cipeundeuy, KPH North Bandung
Abstrak: Ekosistem hutan berperan penting dalam siklus karbon dunia, khususnya hutan tropis karena memiliki potensi terbesar dalam mitigasi CO2 dengan karbon yang tersimpan dalam biomassa hidup, tanah hutan, hingga kayu mati. Indonesia sangat berpotensi menjadi negara dengan penyerap emisi karbon karena mempunyai hutan tropis yang luas. Tujuan penelitian ini, yakni mengetahui dugaan biomassa dan stok karbon pada berbagai kelas umur tegakan Tectona grandis serta potensinya dalam menyerap karbondioksida (CO2) serta memproduksi oksigen (O2). Metode yang digunakan dalam pengambilan data, yakni menggunakan Stratified Sampling dengan plot persegi berukuran 25 m x 25 m sebanyak 55 plot. Kandungan biomassa diduga menggunakan persamaan alometrik. Hasil penelitian menunjukan simpanan biomassa 44.456,8 ton, stok karbon 22.228,4 ton, serapan CO2 163.156,6 ton, dan produksi O2 59.275,8 ton., Forest ecosystems play an important role in the world's carbon cycle, especially tropical forests because they have the greatest potential for CO2 mitigation with carbon stored in living biomass, forest soil, and dead wood. Indonesia has the potential to become a country that absorbs carbon emissions because it has extensive tropical forests. This study aims to determine the estimation of biomass and carbon stock in various age classes of stands of Tectona grandis and their potential to absorb carbon dioxide (CO2) and produce oxygen (O2). The data collection is using stratified sampling with 55 square plots (25 x 25 m). The biomass content was estimated using the allometric equation. The results showed that the biomass content of the stands was simpanan biomassa 44.456,8 ton , stok karbon 22.228,4 ton, produksi O2 59.275,8 ton, dan serapan CO2 163.156,6 ton, the carbon stock of the stands was 22.228,4 ton, the CO2 absorption potential of the stands was 163.156,6 ton, and the O2 production potential of the stands was 59.275,8 ton.
Keyword: biomass, carbon, oxygen, Tectona grandis, carbon dioxide

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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