Judul: Scopulariopsis dan Penicillium pada Landak Mini Afrika (Atelerix albiventris) di Dhonje Golden Farm, Bogor
Abstrak: This research detected the presence of Scopulariopsis and Penicillium in African pygmy hedgehogs (Atelerix albiventris) bred at Golden Dhonje Farm, Bogor District. Twenty hedgehogs were sampled to detect the presence of Scopulariopsis and Penicillium. The signs found include alopecia, crusty, and dermatitis. The presence of the fungus was confirmed by taking samples from the skin and then culturing on Potato Dextrose Agar (PDA) supplemented with chloramphenicol and cycloheximide. Macroscopic and microscopic observations were carried out to identify the two fungal genera. The results showed that eight hedgehogs were infected with Scopulariopsis (40%), six were infected with Penicillium (30%), and four animals were infected with co-infection (20%). The total prevalence of hedgehogs affected by this fungus is 90%. Further research is needed to expand the sample area, identify other types of fungi, and improve the understanding of fungal diseases in African pygmy hedgehogs to ensure the safety of hedgehogs in Indonesia.
Keyword: African pygmy hedgehogs, dermatomycosis, Penicillium, Scopulariopsis

Judul: Scopulariopsis dan Penicillium pada Landak Mini Afrika (Atelerix albiventris) di Dhonje Golden Farm, Bogor
Abstrak: This research detected the presence of Scopulariopsis and Penicillium in African pygmy hedgehogs (Atelerix albiventris) bred at Golden Dhonje Farm, Bogor District. Twenty hedgehogs were sampled to detect the presence of Scopulariopsis and Penicillium. The signs found include alopecia, crusty, and dermatitis. The presence of the fungus was confirmed by taking samples from the skin and then culturing on Potato Dextrose Agar (PDA) supplemented with chloramphenicol and cycloheximide. Macroscopic and microscopic observations were carried out to identify the two fungal genera. The results showed that eight hedgehogs were infected with Scopulariopsis (40%), six were infected with Penicillium (30%), and four animals were infected with co-infection (20%). The total prevalence of hedgehogs affected by this fungus is 90%. Further research is needed to expand the sample area, identify other types of fungi, and improve the understanding of fungal diseases in African pygmy hedgehogs to ensure the safety of hedgehogs in Indonesia.
Keyword: African pygmy hedgehogs, dermatomycosis, Penicillium, Scopulariopsis

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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