Judul: Tinjauan Konservasi Kelor (Moringa oleifera Lam): Studi Kasus di Desa Cikarawang Kecamatan Dramaga Kabupaten Bogor
Abstrak: Moringa (Moringa oleifera Lam.) is a multifunction plant which is useful from the roof until the leaf for health, as food, an increasing environment quality. Research about the usefulness of moringa by Indonesian people and the existence hasn’t been done. The purpose of this research is to identify usefulness of moringa by the people and the existence of moringa in Cikarawang Bogor. This research was done in Cikarawang Bogor from May to June 2013. The data was collecting by field observation and interviewing by snowball method. Based on the result, moringa could be found at almost all hamlet in Desa Cikarawang which is had by 24 families heads or 1,14% from the totally families heads in the village. The census result showed that 65 individuals of moringa in Cikarawang which is planted in various type of habitat. The usefulness type of moringa which is done by the village people are 34 % for ritual custom, 42% for medicine, 12 % for food and 12 % for hedge of rice field.
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Judul: Kajian potensi biji kelor (Moringa oleifera) sebagai koagulan
Abstrak: Adequate access to drinking water is still a huge problem for several countries. One of the reason is the high cost for water’s chemical treatment. Hence, there is a need for low cost and locally available materials. One of the natural coagulants that can be used as an alternative for synthetic chemicals is a seed of Moringa oleifera. In this research, by using the jar test method, the optimum coagulation condition of M. oleifera seed was obtained at pH 6 with concentration of 50 mg/L and settling time of 60 minutes. The optimum condition of M.oleifera unskinned seeds as a coagulant was at pH 7 with concentration of 80 mg/L and settling time of 60 minutes. Previously, optimum coagulation conditions for aluminium chlorohydrate (ACH) has been obtained at pH 7, 10 mg/L, and 10 minutes, respectively. The optimum conditions of each coagulant gave different responses in turbidity, iron and manganese contents decrease. The average values of turbidity reduction with M. oleifera seed, unskinned seed, and ACH were 99.10, 99.07, and 99.71% respectively. The average values of iron reduction for those coagulants were 98.30, 98.45, and 9.,98%, whereas the average values of manganese reduction were 77.87, 81.08, and 78.65%, respectively. Repeatability showed as relative standard deviations on the coagulation process using three types of coagulant on the measurement of three parameters above were below 10%.
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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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