Judul: Young Consumers Decision to Eat Organic Vegetables and Its Impact on Obesity and Immunity
Abstrak: The higher antioxidant content of organic vegetables compared to conventional vegetables is believed to reduce the risk of various diseases. However, it turns out that in Indonesia there are still many health problems due to people who do not consume healthy foods, one of which is organic vegetables. The purpose of this study is to analyze the factors that influence consumers in Jabodetabek in consuming organic vegetables and analyze the impact of organic vegetable consumption on obesity and endurance. The method used is binary logistics and Propensity Score Matching (PSM). This research was conducted using primary data with a total sample size of 256 respondents. The results of this study indicate that the factors that positively influence consumer decisions in Jabodetabek in consuming organic vegetables are motivational and lifestyle factors. The results also show that consuming organic vegetables has an impact on consumers Body Mass Index (BMI) and has no impact on consumers' endurance.
Keyword: consumption, impact, influencing factors, organic vegetables, Propensity Score Matching (PSM)

Judul: Faktor-faktor yang Mempengaruhi Perilaku Konsumsi Pangan Organik pada Kelompok Vegetarian di Kota Bogor
Abstrak: Trend of healthy lifestyle is increasing in modern society. Healthy lifestyle becomes one of quality standards. One of the efforts to live a healthy lifestyle has been practised in Indonesia, including by introduce organic foods. Studies about organic food consumption in Indonesia are still limited. The purpose of this study was to determine the factors associated with behavior of organic foods consumption among vegetarian in Bogor City. The method used in this study was cross sectional design with 42 vegetarians as study participants. The study was conducted in August until September 2014. Data were collected using questionnaire and Food Frequency Questionnaire (FFQ). The data analysis was performed using univariate analysis for frequency distributions, bivariate analysis for Chi Square test, and double logistic regression test with prediction model. The study results shout that factors related to organic food consumption behavior in vegetarian were age, gender, education, income, and knowledge (Pvalue < 0.05 ). Further more, the variables that were not associated in this study were the number of family member, job, and illness history. The most dominant factor was the income.
Keyword: Bogor Agricultural University (IPB), vegetarian, consumption, organic food, healthy lifestyle

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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