Judul: Demonstration of Species Composition,  Stand Structure, Biomass, and Carbon Storage in Stands at the Bamboo Arboretum,  IPB Dramaga Campus
Abstrak: Ekosistem hutan dapat menyerap gas rumah kaca dengan cara menyerap CO2 dari udara menjadi simpanan karbon dalam vegetasi. Arboretum Bambu Kampus IPB Dramaga menjadi salah satu ruang terbuka hijau di dalam kampus dalam upaya mengurangi pencemaran lingkungan kota. Tujuan penelitian ini mendeskripsikan komposisi jenis, struktur vegetasi, menduga potensi biomassa, simpanan karbon, dan serapan karbon dioksida (CO2), serta mendeskripsikan sifat-sifat tanah di Arboretum Bambu Kampus IPB Dramaga. Metode yang digunakan yaitu pengukuran diameter dan tinggi (pohon, tiang, pancang, kayu mati, dan pohon mati) serta pengukuran kadar air tumbuhan bawah, semai, serasah, dan ranting. Pengambilan data tanah dilakukan dengan metode purposive sampling. Hasil penelitian menunjukkan komposisi jenis pada tegakan hutan di Arboretum Bambu Kampus IPB Dramaga didominasi oleh jenis Hevea brasiliensis (zona karet dan zona Dipterocarpaceae), Bambusa blumeana (zona bambu), dan Swietenia mahagoni (zona campuran). Kecuali zona bambu struktur horizontal tegakan pohon di Arboretum Bambu Kampus IPB Dramaga berbentuk huruf “J” terbalik. Stratifikasi tajuk hutan di Arboretum Bambu Kampus IPB Dramaga didominasi oleh stratum C. Zona karet menjadi zona dengan nilai tertinggi biomassa (112,54 ton/ha), simpanan karbon (52,89 ton/ha), dan serapan karbon dioksida (196,67 ton/ha). Kandungan C-organik tanah di Arboretum Bambu Kampus IPB Dramaga pada zona Dipterocarpaceae, zona karet, dan zona bambu termasuk tinggi, sedangkan pada zona campuran termasuk sedang.
Keyword: Biomass, carbon dioxide uptake, carbon storage, species composition, stand structure

Judul: Serapan Karbon di Taman Konservasi Kampus IPB, Dramaga
Abstrak: Hutan kota dapat menyerap CO2 di udara melalui proses fotosintesis, penyerapan CO2 dalam proses fotosintesis ini akan menghasilkan biomassa yang merupakan simpanan karbon (carbon pool) yang terkandung dalam pohon. Teknik pengambilan data menggunakan metode sensus dan metode pengumpulan data contoh simple random sampling dengan dua luasan plot yaitu 20 x 20 m2 dan 20 x 40 m2 pada IS 100%, 50% dan 25% menggunakan persamaan alometrik Manuri et al. (2017) dan Ketterings et al. (2001). Hasil penelitian menunjukkan hasil yang lebih teliti didapatkan dengan menggunakan luasan plot dan intensitas sampling yang lebih sedangkan, hasil yang lebih akurat didapatkan dengan menggunakan luasan plot dan intensitas sampling yang lebih kecil., Urban forests can absorb CO2 in the air through the process of photosynthesis, the absorption of CO2 in this photosynthesis process will produce biomass which is a carbon pool (carbon pool) contained in trees. The data collection technique used the census method and the sample data collection method was simple random sampling with two plot areas, namely 20 x 20 m2 and 20 x 40 m2 at IS 100%, 50% and 25% using the allometric equations of Manuri et al. (2017) and Ketterings et al. (2001). The results showed that more precise results were obtained by using a larger plot area and sampling intensity, while more accurate results were obtained by using a smaller plot area and sampling intensity.
Keyword: Intensitas sampling, luasan plot, serapan CO2, CO2 absorption, plot area, sampling intensity

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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