Judul: Potensi Pengembangan Usaha Ternak Jangkrik di Kelurahan Rangkapanjaya Baru, Kecamatan Pancoran Mas, Kota Depok
Abstrak: Cricket’s farming have potency to be developed as a profitable business. The potency is seen from biological aspects, potency of resources and environmental and also business potency. From the biological point of view, cricket was very efficient, with short live cycle (±70 days) and high egg production (100-250 eggs/cycle). Farmer harvested crickets 6 time every year. Egg’s production of cricket as much as 100-250 eggs with 20% mortality rate. The main component for cricket breeding are breed stock and feed. Breed stock was obtained from breeder and the environment. The parent stock were obtained from the environment has good body resistence. Feed, especially vegetable were obtained from the surrounding environment around the house. Papaya and cassava tree can be found easily in Kelurahan Rangkapanjaya Baru. The cricket’s farming was well accepted by the community. The existence of cricket’s farming can reduce the unemployment in Kelurahan Rangkapanjaya Baru and cricket’s farming doesn’t has any negative impact to the environment. Business potency from cricket’s farming can be seen from the farmer’s income and market potency. The income of farmers received from cricket’s farming were Rp.9.837.705 per year and the economic of scale is 58 box. The biggest cost spent for labor cost as much as 61,09% from total cost. Cricket’s revenue is much to Rp.33.738.435 per year. R/C ratio of cricket’s farming were 1,41. Market potency seen by the trend of cricket’s demand used time series analysis. The result of forecasting of cricket’s demand using equation: Y = 397.646,41 + 15.749,49X – 820,27X2 + 22,04X3 showing cricket’s demand had tendency to increase in the future.
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Judul: The Optimalization of Local cricket (Gryllus bimaculatuc de geex) Care Management at Production Time
Abstrak: The cricket culture in our country is highly supported by climate, weather, the existence of land, and kind of cricket around us. This culture has been doing to evade from scarcity and destroyed. On that purpose, we need the cricket culture continuously to avoid those things from happening. The research was done in the Laboratory of Cattle NRSH (Non Ruminansia dan Satwa Harapan), Department of Cattle Production Science, Cattle Ranching Faculty, Bogor Institute of Agriculture. The research was done since April until May 2000. The aim of this research is to learn how the influence of density per a wide and vegetable food (Brassica juncea and Carica papaya) to eggs production for local cricket species i.e. Gryllus bimaculatus de geex at the production time. The variable evaluated in this research are; production, average of egg production per head, feed consumption (concentrate and vegetables) as the supported data. The data were analyzed by ANOVA (Analysis of Variance). If the result shows the influence of each treatment before, then the analysis is continued with the advance test, LSD.
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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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