Judul: Faktor-Faktor yang Memengaruhi Populasi Sapi Dalam Negeri serta Implikasi Kebijakannya terhadap Swasembada Daging Sapi di Indonesia
Abstrak: In recent years, consumption of beef in Indonesia tends to increase. Increase in the rate of demand for beef in line with population growth, per capita incomes, and changing consumer tastes. The problem that occurs is that Indonesia is still a net importer of beef with 35 percent of beef supply comes from imports. It is influenced by the volume of beef production in Indonesia is not proportional to the increase in consumption. Analysis method using multiple linear regression analysis with the period from 1989 to 2011 as well as the use of beef population as the dependent variable and the four independent variables which include beef prices, feed prices, credit, and production technology. Concluded that the price of beef, credit, production technology and animal feed prices can affect cattle population in the country. Therefore, efforts to achieve self-sufficiency in beef (Beef Self-Sufficiency Program) in 2014 focused on increasing the cattle population.
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Judul: Analisis Faktor-faktor yang Memengaruhi Permintaan Daging Sapi dan Implikasinya terhadap Kebijakan Impor
Abstrak: Chaotic imported beef in November 2012, resulting in a rise in the price of beef in the market so that the need for special handling so that beef prices. This research was conducted to analyze the factors that affect the demand for beef in Indonesia and the role of substitution, and the implications of policy import. This study uses secondary data the period 1982-2011. Analyses were performed with the econometric approach, estimation models using Principal Component Regression (RKU). The results show the coefficient of determination (R2) of 71.7 percent, and the elasticity of each of the variables tested small relative to the demand for beef show that beef consumption is not replaceable. Beef demand continues to increase every year even though the price of beef is relatively expensive. Formulations stabilization policy covering the prices of additional supplies at the time of the great religious, imports done merely to meet national shortage of supplies beef and ensure the availability of food -substitutions beef as the availability of chicken meat and eggs, and increases the production of beef in the long run.
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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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