Judul: Analisis Risiko Penjualan Pada Usaha Reptil Di Kota Jakarta (Studi Kasus, Savera Reptile Jakarta)
Abstrak: The problems faced by Savera Reptile is sales fluctuation of reptile that tend to fluctuate. This research aims to identify the risk of sales, analyzing risk status, and formulates an alternative treatment that can be used in order to overcome price risk animals of reptiles. This research use several method such as risk mapping, descriptive analyze, z-score, and Value at Risk. Sales risk source that happened in Savera Reptile due to high product was lack of selling and high mortality rates, this was due to product quality, market competition, disease, food availability, and the community’s purchasing power. The biggest risk source challenge is market competition while the lowest is the food availability. The handling alternative which can reduce of risk occurence are prevention and mitigation.
Keyword: Bogor Agricultural University (IPB), Sales Fluctuation, Sales risk, Reptiles Busines

Judul: Perdagangan reptilia sebagai binatang peliharaan di DKI Jakarta
Abstrak: DKI Jakarta in the world of wildlife trade is often referred as yellow dots, a city vulnerable to illegal trade. Wildlife trade in DKI Jakarta consists not only on ornamental fish, mammals and birds, but even reptiles. This study aims to describe trade locations, identify species of trade and analyze preferences of pet reptiles. The study was conducted in five traditional markets and 35 pet shops in DKI Jakarta, using interviews and investigative methods. I also carried out survey on cyber-market trade and interviews to pet reptile owners. The study was carried out from August 20th to November 20th, 2010. A total of 52 species (26 species of turtles, 23 snakes and three lizards) were traded on traditional markets, and 46 species (21 species of turtles, 19 species of snakes and six species of lizards) at the pet store. In traditional markets the common species sold are local species, but not on pet stores where most are imported species. In total, survey found five species of protected reptiles according to PP No. 7 of 1999, four species of Appendix I CITES’s reptiles and six species listed as critically endangered by IUCN Red List. Three forums in internet carried out cyber markets of pet reptiles. The most favorite pet reptiles were snakes, especially the ball python (Python regius).
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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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