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 Absorption in Various Age Classes of Teak Stands in RPH Wungu, KPH Madiun
Abstrak: Isu pemanasan global yang saat ini terjadi menjadi pemicu diperlukannya informasi mengenai karbon. Salah satu faktor yang dapat menurunkan akumulasi karbon dioksida di atmosfer adalah penyerapan oleh vegetasi. Hutan melalui fotosintesis mengabsorbsi karbon dioksida dan menyimpannya sebagai materi organik dalam bentuk biomassa. Tujuan dari penelitian ini yaitu untuk menduga biomassa, simpanan karbon, serapan karbon dioksida (CO2) dan produksi oksigen (O2) pada berbagai kelas umur tegakan jati (Tectona grandis) di RPH Wungu, KPH Madiun. Metode yang digunakan dalam pengambilan data, menggunakan stratified sampling dengan plot lingkaran berukuran 0,1 ha sebanyak 57 plot. Analisis data pendugaan biomassa menggunakan persamaan alometrik. Biomassa, simpanan karbon, serapan karbon dioksida (CO2) dan produksi oksigen diperoleh dari konversi nilai biomassa. Hasil pendugaan rata-rata biomassa, simpanan karbon, serapan karbon dioksida dan produksi oksigen (O2) pada tegakan jati di RPH Wungu, KPH Madiun secara berurutan adalah 238,60 ton/ha; 112,14 ton/ha; 411,19 ton/ha dan 299,04 ton/ha., The issue of global warming that is currently happening is the trigger for the need for information on carbon. One of the factors that can reduce the accumulation of carbon dioxide in the atmosphere is absorption by vegetation. Forests through photosynthesis absorb carbon dioxide and store it as organic matter in the form of biomass. The study aims to estimate for biomass, carbon stock, carbon dioxide (CO2) absorption and oxygen (O2) production in various age classes of teak stands (Tectona grandis) in RPH Wungu, KPH Madiun. The method used in data collection, using stratified sampling with circular plots measuring 0,1 ha as many as 57 plots. Analysis of biomass estimation data using allometric equations. Biomass, carbon storage, carbon dioxide absorption and oxygen production were obtained from the conversion of biomass values. The results of the estimation for biomass, carbon storage, carbon dioxide (CO2) absorption and oxygen (O2) production in teak stands in RPH Wungu, KPH Madiun, respectively, were 238,60 tons/ha; 112,14 tons/ha; 411,19 tons/ha and 299,04 tons/ha.
Keyword: biomass, carbon stock, carbon dioxide, oxygen, Tectona grandis

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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