Judul: Performa ulat tepung (Tenebrio molitor L.) dengan berbagai rasio pemberian daun ginseng (Talinum paniculatum G.) dan daun singkong (Manihot esculenta C.)
Abstrak: yellow mealworms is the larva of Tenebrio molitor L beetle. Now a days, yellow mealworm are reared because of it economic value. Yellow mealworm can be used for diets of birds, fish, and reptiles. The research was done on July 18m up to August 2 9 2005 at Non Ruminants and Prosppective Animals Division,Department of Animal Production and Technology, Faculty of Animal Scien, Bogor Agricultural University.
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Judul: Performa ulat tepung (Tenebrio molitor L.) pada suhu dan kelembaban yang berbeda
Abstrak: Yellow mealworm is the larval stage of Tenebrio molitor L. beetle. Nowadays, yellow mealworms are reared because of its economic value. Yellow mealworm can be used for feed and food. The growth of yellow mealworms is influenced by temperature and humidity, so a suitable combination of temperature and humidity is necessary for yellow mealworm optimal production.The research was done from July 1 5u~p t o Oktober lo* 2005 at Non Ruminants and Prospective Animals Division, Departement of Animal Production and Technology, Faculty of Animal Science, Bogor Agricultural University. The purpose of this research was to compare the yellow mealworms (Tenebrio molitor L.) growth performances at different temperature and humidity. This research used 1500 yellow mealworms aged 35 days old. The experiment used Completely Randomized Design in 2x2 factorial experiment. The first factor was temperature (29 and 31 OC) and the second factor was humidity (69% and 71%). Each treatment combination had five replicates which consisted 75 yellow mealworms. The observed variables were feed consumption, body lenght and weight gain, feed conversion based on body lenght and weight gain, and mortality. Data were analyzed by using ANOVA and tested with Least Significant Difference Test (SAS 6.12) to know the difference among the treatments. The result showed that the lower temperature (29 OC) with higher humidity (71%) gave the best growth performances for 35-65 days old yellow mealworms. Otherwise, the best growth performances for 65-75 days old yellow mealworms were at higher temperature (3 1 OC) with lower humidity (69%). Keywords : growth performance, Tenebrio molitor L., temperature, humidity
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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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