Judul: Analisis Willingness to Pay terhadap Pelanggan Sayuran Organik Agatho Bina Sarana Bakti
Abstrak: Increased public awareness to the environment has led to change the public preference of the product consumption. An Organic vegetable is one of the products consumption that environmentally friendly and good to maintain the health. Based on that issue, this research aims to (1) Identify consumers characteristic who made a purchase on organic vegetable is using descriptive analysis; (2) Measure consumer willingness to pay using contingent valuation method; and (3) Analyze factors that affecting organic vegetable costumer willingness to pay using logistic regression. The result of this research showed the mean of maximum WTP for carrot commodity is Rp.22.989,80; lettuce is Rp. 33.744,90; cabbage is Rp. 21.989,80; cauliflower is Rp. 36.989,80; broccoli Rp. 42.989,80 and pakchoy is Rp. 27.989,80. The factor that affecting consumer willingness to pay for organic vegetable is household size and consumer income.
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Judul: Analisis Kesediaan Membayar (Willingness To Pay) Sayuran Organik dan Faktor - Faktor yang Mempengaruhinya (Studi Kasus Kota Bogor, Jawa Barat)
Abstrak: The era of modernization and the increasing in GDP per capita have changed the consumer behavior of Indonesian people. Indonesian people realize the importance of healthy living by consuming organic vegetables. The increasing production cost as a result of improving product quality induced the selling price of organic vegetables in market. This research aims to identify customer characteristics who made a purchase on organic vegetables by using descriptive analysis, to estimate consumer willingness to pay (WTP) using Contingent Valuation Method (CVM) and to analyze factors that influence the Willingness To Pay using Structural Equation Modeling (SEM) with LISREL. The result of this research showed the mean of maximum WTP for cabbage commodity is Rp 18.738; lettuce is Rp 30.048; broccoli is Rp 40.250; chinese cabbage (bok choy) is Rp 24.368 and carrot is Rp 19.820. The attitude and obstacle effect on WTP is significant, while the effect of SES is not significant.
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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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