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: Analisis Biomassa dan Kandungan Karbon pada Jenis Serasah Daun Tanaman Hutan Kota di Arboretum Arsitektur Lanskap IPB, Bogor
Abstrak: Urban forest functioned as oxygen balancing (O2) and carbon dioxide (CO2), reduce pollutant, stored and emission carbon. This research aimed to measured biomass, carbon dioxide content, connection between biomass and binding carbon, and measured carbon dioxide absorption ability on manure type of city Forest plant on Arboretum Architecture Landscape IPB, Bogor. Method used in this research was destructive method during 7 weeks to 7 types of city plants were : trembesi (Samana saman), merbau (Intsia bijuga), dahu (Deacontomelon dao),ki putri (Podocarpus neriifolius), kayu manis (Cinnamonum zeylanicum), nangka (Artocarpus heterophylus), simpur (Dillenia indica). Trembesi (Samanea saman) and merbau (Intsia bijuga) was such type that has both highest binding biomass and carbon from seven type of city forest plants. Besides that leaf manure type from trembesi (Samanea saman) and merbau (Intsia bijuga) that have highest ability to absorb CO2 about 4.749 and 4.007 ton/ha/year. Urban forest development by plant both trembesi and timber tree types were as one alternative to reduce increasingly emission of carbon.
Keyword: urban forest., carbon content, biomass

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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