Judul: Knowledge and Attitude of Foodborne Disease in Dairy Cattle of the Students in the Department of Community Nutrition IPB University Indonesia
Abstrak: Foodborne disease dapat terjadi akibat mengonsumsi makanan dan minuman yang sudah tercemar mikroorganisme patogen. Susu merupakan salah satu produk pangan asal hewan yang dapat mengakibatkan foodborne disease. Penelitian dilakukan dengan mengisi kuesioner secara online oleh responden yang berasal dari mahasiswa Departemen Gizi Masyarakat, Fakultas Ekologi Manusia IPB University. Tujuan penelitian ini adalah untuk mengetahui dan mengidentifikasi faktor yang memengaruhi tingkat pengetahuan dan sikap. Metode penelitian yang digunakan melalui teknik penarikan contoh acak berstrata dan dianalisis menggunakan uji Spearman Correlation untuk melihat hubungan karakteristik dan pengetahuan serta sikap responden. Hasil penelitian menunjukkan bahwa tingkat pengetahuan terkait foodborne disease pada susu sapi pada mahasiswa angkatan 55 (2018), 56 (2019), dan 57 (2020) Departemen Gizi Masyarakat, FEMA IPB University berada pada kategori cukup, sedangkan sikap berada pada kategori baik. Pengujian Spearman Correlation menunjukkan adanya hubungan antara angkatan dengan tingkat pengetahuan (P< 0,05). Berdasarkan hasil di atas kami menyimpulkan bahwa tingkat pengetahuan dan sikap responden terhadap foodborne disease pada susu sapi dipengaruhi oleh tingkat pendidikan, tingkat kesadaran, dan lingkungan sosial., Foodborne disease caused by consuming contaminated food and drink. One of the animal food products which possibly cause foodborne disease is a dairy milk. Research were done by an online questionnaire to students from Public Nutrition Department, Faculty of Human Ecology IPB University, with the purpose of knowing the knowledge and attitude levels of respondents. Research methods were done by stratified random sampling and data was analyzed by Spearman Correlation to determine the relationships between characteristics and knowledge and also attitude of the respondents. Result shows that the knowledge about foodborne disease in dairy milk from students batch 55 (2018), 56 (2019), and 57 (2022) in the Departement of Community Nutrition, Faculty of Human Ecology IPB University is adequate, while the attitude was category as good. Spearman Correlation shows that there is a correlation between student’s batch (year of entry) and knowledge level (P<0,05). We concluded that knowledge level and attitude of respondents to foodborne disease of dairy milk is affected by education level, awareness level, and social environment.
Keyword: Foodborne Disease, Mahasiswa, Pengetahuan, Sikap, Attitude, Foodborne Disease, Knowledge, University Student

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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