Judul: Isolasi dan Identifikasi Fungi Mikoriza Arbuskula (FMA) Lokal pada Rhizosfer Rumput Lahan Pasca Tambang Timah di Kabupaten Belitung Timur.
Abstrak: Tin mining activity caused the effect for environmental such as increased sand fraction, decreased available nutrient content, decreased soil fertility and heavy metal pollution. These conditions inhibit the plant growth, while the land will be build the pasture. The use of arbuscular mycorrhizal fungi (AMF) can returned the conditions of marginal land. The aim of this research was to examined the potential of land use and get the FMA which are adapted to the environment post tin mining. This research used Completely Randomized Design with 5 type of plant and severally type appointed 3 replications. Parameters in this research are soil content, the amount of spores, percentage of root infection, and spores identification. The result show that post tin-mining land potential for build the pasture. Glomus sp was dominant at this land and potential as an inoculum.
Keyword: arbuscular mycorrhizal fungi, pasture, post tin-mining land

Judul: Studi Status Fungi Mikoriza Arbuskula Di Areal Rehabilitasi Pasca Penambangan Nikel (Studi Kasus PT INCO Tbk. Sorowako, Sulawesi Selatan).
Abstrak: PT INCO Tbk. is one of the biggest nickel mining company in the Asia- Pasific region and has been operated commercially in Indonesia since 1978. It is located at Sorowako, South Sulawesi Indonesia with the area up to 218.000 hectares. The mining operation process is surface mining. It eliminated the existing vegetation, and it will lead to soil erosion, loss of biodiversity, damage of wildlife habitats and degradation of watershed area, considering with these negative impacts a revegetation programme is fully needed (Setiadi 1995). Revegetation that has been done obstacled by the marginal land conditions where soil structure has been damaged and it has became a lateritic soil. It absorbs elements of phosphate (P), which is essential for plant life. It will be poor of Pavailable that can be absorbed by plants. Therefore input for more effective technology and environmentally friendly is needed, among others by applying a bio-technology Arbuscular Mycorrhizal Fungi biofertilizer (AMF). It has some functions, one of them is increasing nutrients absorption, especially P. Therefore, research on the existence of mycorrhizal status needs to be done as an introduction for research and application of mycorrhizal in the rehabilitation field of post- nickel mining. The result of this research is FMA has been associated with all of observed plants. Some potentially plants to be developed are Sengon buto (Enterolobium cyclocarpum), Sengon albizia (Paraserianthes falcataria), Dengen (Dillenia cerrata), Teak (Tectona grandis), Johar (Senna siamea), Kayu angin (Casuarina equisetifolia), Kayu tanduk (Alstonia spectabilis), and Eucalyptus (Eucalytus Urograndis). Several genera that were found are Glomus sp; Acaulospora sp; and Gigaspora sp.
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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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