Judul: Penyerapan Karbon dan Skenario Net Zero Carbon Emission per Kapita: Studi Kasus Hutan Tanaman Pinus (Pinus merkusii) di KPH Kediri
Abstrak: Meningkatnya emisi CO2 di udara menimbulkan kekhawatiran dan merasa perlu melakukan pengukuran kandungan karbondioksida dan laju sekuestrasi karbondioksida secara berkala. Salah satu upaya untuk memitigasi emisi CO2 adalah dengan melakukan penanaman untuk diserap oleh vegetasi. Hutan mempunyai kemampuan untuk menyerap karbon dan melakukan sekuestrasi. Tujuan penelitian ini untuk menghitung besaran laju sekuestrasi karbondioksida pinus per kg/pohon/tahun, mengidentifikasi besaran emisi per kapita, dan menyusun skenario net zero carbon emission untuk memitigasi emisi CO2. Metode pengambilan data menggunakan stratified sampling. Analisis data pendugaan biomassa, karbon menggunakan persamaan allometrik.. Skenario net zero carbon emission yaitu melalui penanaman, pembayaran carbon credit, dan pembayaran carbon tax. Hasil penelitian menunjukkan laju sekuestrasi karbondioksida pohon pinus sebesar 27,08 kg/pohon/tahun. Emisi per kapita Jakarta 4 ton CO2/tahun. Skenario penanaman pohon pinus untuk menetralkan emisi jakarta sebanyak 148 pohon. Pembayaran carbon credit menggunakan lembaga Environmental Protection Agency sebesar Rp1.409.764/tahun. Skenario pembayaran carbon tax emisi Jakarta sebesar Rp120.000/tahun, The increasing CO2 emissions in the air raise concerns and feel the need to periodically measure carbon dioxide content and carbon dioxide sequestration rates. One of the efforts to mitigate CO2 emissions is by planting to be absorbed by vegetation. Forests have the ability to sequester carbon and perform sequestration. The purpose of this study is to calculate the amount of pine carbon dioxide sequestration rate per kg/tree/year, identify the amount of emissions per capita, and develop a net zero carbon emission scenario to mitigate CO2 emissions. The data collection method uses stratified sampling. Analysis of biomass, carbon estimation data using allometric equations. The net zero carbon emission scenario is through planting, carbon credit payments, and carbon tax payments. The results showed a pine tree carbon dioxide sequestration rate of 27.08 kg/tree/year. Jakarta's per capita emissions are 4 tons of CO2/year. The scenario of planting pine trees to neutralize Jakarta's emissions is 148 trees. Carbon credit payment using the Environmental Protection Agency amounting to Rp1,409,764/year. Jakarta's carbon tax emission payment scenario is Rp120,000/year.
Keyword: sequestration, Pinus merkusii, carbon emission, net zero emission

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: 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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