Judul: Inokulasi Bakteri dan Fungi Mikoriza Arbuskula pada Semai Jabon (Anthocephalus cadamba (Roxb.) Miq) di Media Tanah Ultisol
Abstrak: Bacteria and AMF is a microorganisms that help increasing the plants growth. The purpose of this research is to test the effectiveness of bacteria isolates (Bacillus subtilis and Enterobacter hormaechei) and Arbuskula Mycorrhizal Fungi (AMF) in influencing plant growth on jabon (Anthocephalus cadamba Miq). This research is Complete Randomsized Design (CRD) with two factorial patterns which containts six combination treatment with five times replication. Showed that the interaction of the spores Gigaspora sp. interaction with both isolates of bacteria (Bacillus subtilis (M1B1) and Enterobacter hormaechei (M1B2)) have decreased the control of roots infection (M1B0), each of them is 20.25% and 36.21 %. In general the interactions spores of Gigaspora sp. with Enterobacter hormaechei (M1B2) has give a good response compared with the interaction spores of Gigaspora sp. with Bacillus subtilis (M1B1) with the parameter height, diameter, bud biomass and Seed Quality Index (SQI). The value increased (M1B2) of each is about 26.96%, 46.61%, 11.19%, 39.98% of the controls. The interaction of mychorrhizal and bacteria in general, significantly affect the jabon seedling growth. All of this has been proven by the increased of the control.
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Judul: Keanekaragaman Fungi Mikoriza Arbuskula di bawah Tegakan Tanaman Agroforestri Jabon (Anthocephalus cadamba Miq.) di Purwakarta, Jawa Barat
Abstrak: Anthocephalus cadamba is a one of tree species from Rubiaceae family that may symbiotic with arbuscular mycorrhizal fungi (AMF). The presence of AMF is very important for the soil nutrient existence, such as P, K, Mg, Fe, and also Mn to increase the growth of plants. The purpose of this research is to identify the diversity of AMF spores under stand of jabon agroforestry plants and to analyze the AMF status on various jabon planting patterns. Spores isolation was taken from soil sample using wet sieving method and decanthing method. Spores from the isolation morfologically identified by observing spores reaction through Melzer’s liquid. The result of this research indicated that soil chemical characteristic on three planting patterns of jabon do not give any concrete effects to the percentage of AMF’s root colonization. There are three genus of AMF found on the research location consist of Glomus sp., Acalauspora sp., and Scutellospora sp. Based on statistical analysis result, the jabon intercropping planting patterns which combining cucumber plants resulting the highest value of both diameter and height growth on various jabon planting patterns.
Keyword: root colonization, planting pattern, arbuscular mycorrhizal fungi

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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