Judul: Persepsi Santri dalam  Mengkonsumsi Susu Kambing (Studi Kasus di Pondok Pesantren Modern  Sahid Desa Gunung Menyan Kecamatan Pamijahan Kabupaten Bogor)
Abstrak: The objectives of this study were: 1) to identify characteristic and perception of students of PPMSGM about milk goat products and their consumption decisions; 2) to analyze the correlation between characteristic of consumers and their perception toward milk goat product and 3) to analyze correlation between perception toward milk goat and their consumption decision. The sample of this study was 86 people and taken by using accidental sampling. Primary data was obtained by questionnaire and interview to student and official members of PPMSGM. Secondary data was obtained from relevant institutions which related to this research topic. Data were analyzed by descriptive and correlation analyses by using Rank Spearman, Chi Square and statistical test. The results were: 1) no correlation among age, sexes, and respondents’ perception of milk goat; 2) a negative correlation between income and respondents’ perception; 3) a positive correlation between source of information and flavor and benefit; 4) a positive correlation between product knowledge and package; 5) a positive correlation between taste and consumption decision. Almost positive the student perception toward milk goat and they also decided to consume it.
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Judul: The Perceptions and Consumer Behavior of IPB Students in  Consuming UHT Milk and Pasteurized Milk
Abstrak: Mahasiswa sebagai penerus bangsa harus memenuhi kecukupan gizi, salah satunya dengan mengonsumsi susu. Penelitian ini bertujuan mengetahui persepsi dan perilaku konsumen mahasiswa IPB terhadap konsumsi susu UHT dan susu pasteurisasi. Responden contoh dalam penelitian ini sebanyak 203 mahasiswa IPB dari berbagai fakultas yang dipilih dengan menggunakan tenik penarikan contoh acak berlapis. Data bersifat nominal di uji dengan uji Chi square dan data bersifat ordinal di uji Rank Spearman. Hasil penelitian didapatkan bahwa persepsi terhadap harga dan kemasan pada susu UHT dan susu pasteurisasi tidak berbeda nyata. Frekuensi minum susu mahasiswa yaitu 2-3 kali seminggu dengan jenis susu UHT yang dominan dikonsumsi. Kemasan yang paling banyak dibeli serta volume sekali konsumsi minum susu yaitu 250 mL Terdapat hubungan korelasi antara karakteristik responden (uang saku dan program studi) dengan perilaku mengonsumsi susu (frekuensi minum, kemasan susu dan jenis susu yang dikonsumsi). Hubungan korelasi persepsi susu UHT dan susu pasteurisasi terhadap perilaku mengonsumsi (jenis susu yang dikonsumsi dan frekuensi minum) didapati hasil yang signifikan., Students as the nation's successor must fulfill adequate nutrition, one way is by consuming milk. This study aims to determine the perceptions and consumer behavior of IPB students on the consumption of UHT milk and pasteurized milk. The sample respondents in this study were 203 IPB students from various faculties who were selected using The Stratified Random Sampling technique. Nominal data were tested by the Chi square test and ordinal data were tested by the Rank Spearman test. The results showed that perception of the price and packaging of UHT milk and pasteurized milk was not significantly different. The frequency of drinking student milk is 2-3 times a week with dominant UHT milk consumed. The most purchased packaging and the volume for one consumption of drinking milk is 250 mL. There is a correlation between the characteristics of respondent (allowance and study program) and behavior of consuming milk (frequency of drinking, milk packaging, type of milk consumed). The correlation between perceptions of UHT milk and pasteurized milk on consumption behavior (type of milk consumed and frequency of drinking) was found to be significant. All correlation directions obtained were positive with strength of correlation relationship ranging from very weak to moderate.
Keyword: consumer behavior, perception, postteurized milk, uht milk

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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