Judul: Pengaruh Pohon Penaung Leda (Eucalyptus deglupta Bl.) dan Suren (Toona sureni Merr.) terhadap Pertumbuhan dan Produksi Kopi (Coffea arabica L.)
Abstrak: Agroforestry of coffee in Perum Perhutani BKPH Banjaran, KPH Bandung Selatan was established. Coffee were planted under E. deglupta and T. sureni. The difference of species shade tree may give influence on the growth and production of coffee. The purpose of this research was to compare the influence of shade tree E. deglupta and T. Sureni on the growth and production of coffee (C. arabica). The growth parameters of coffee consisting of diameter and height, while the production parameters of coffee consisting of productive branch, bunches of branch, fruit of bunches, and coffee cherries weight. The result of ttest showed that diameter of coffee was not significantly different. Height of coffee was significantly affected by the species of shade tree. The average height coffee under T. Sureni (170.58 cm) greater than the height coffee under E. deglupta (151.56 cm). However, leda provide better coffee production compared to suren. Based on the result of t-test, the number of productive branches and coffee cherries weight have significantly different values. The number of productive branches and coffee cherries weight under leda bigger than coffee under suren. Production of coffee under leda (3 127.17 kg/ha) greater than suren (1 173.74 kg/ha).
Keyword: Bogor Agricultural University (IPB), shade tree, production, growth, agroforestry of coffee

Judul: Pendugaan Potensi Simpanan Karbon pada Agroforestri Kopi (Coffea arabica L.) dengan Leda (Eucalyptus deglupta Bl.) dan Suren (Toona sureni Merr.)
Abstrak: Greenhouse gases emissions can be reduced by increasing carbon stock through the development of forests. Agroforestry systems are expected to have considerable potential as a carbon stock in the form of biomass. The aims of this research are to estimate and compare the potential of carbon stock in agroforestry E. deglupta with C. arabica and T. sureni with C. arabica. The estimation of carbon stock in stands and coffee plants using allometric equations while for understorey, litter, and fruit with destructive methods. The results showed the difference between the two patterns agroforestry where AgF1 pattern has a total value of carbon stock is higher than AgF2 pattern. Total carbon stock in AgF1 pattern is 37.49 ton/ha while AgF2 pattern is 14.26 ton/ha. The percentage of canopy closure in AgF1 pattern higher than AgF2 pattern with values are 51.13 % and 30.195 %. The value of Pearson correlation test showed canopy closure had not significant effect of biomass in the understorey .
Keyword: Bogor Agricultural University (IPB), T. sureni, E. deglupta, carbon storage, C. arabica, Agroforestry

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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