Judul: Level of Knowledge, Concern, and Consumer Attitude of Jabodetabek Students towards Expiration Date on Packaged Food Products
Abstrak: Tanggal kedaluwarsa merupakan informasi yang wajib dituliskan pada label produk pangan kemasan untuk memberikan informasi kepada konsumen tentang kondisi akhir suatu produk pangan yang masih terjamin mutunya. Penelitian ini bertujuan untuk mengetahui kepedulian, pengetahuan, dan sikap konsumen mahasiswa terhadap tanggal kedaluwarsa pada produk pangan kemasan. Penelitian ini dilakukan di wilayah Jabodetabek. Penelitian ini berbentuk survei dengan menggunakan aplikasi Google Formulir. Responden dibagi menjadi dua kelompok berdasarkan jenis kelaminnya, yaitu laki-laki (n=139) dan perempuan (n=171). Hasil penelitian menunjukkan 86.3% responden laki-laki dan 89.5% responden perempuan memiliki kebiasaan membaca label produk pangan sebelum membeli. Kedua kelompok responden menganggap tanggal kedaluwarsa sebagai informasi utama yang diperhatikan saat membaca label pangan sedangkan nomor registrasi produk (MD/ML/PIRT) dianggap paling tidak penting. Informasi label pada kemasan pangan memengaruhi konsumen dalam membeli, kedua kelompok responden memilih informasi tanggal kedaluwarsa sebagai informasi yang paling memengaruhi dalam membeli produk pangan kemasan. Kedua kelompok responden, sebagian besar sudah mengetahui istilah expired date dan best before. Namun, responden masih belum memahami produk pangan yang wajib mencantumkan tanggal kedaluwarsa dan yang tidak wajib mencantumkan tanggal kedaluwarsa. Kedua kelompok responden memiliki sikap yang hampir sama terhadap informasi tanggal kedaluwarsa. Sebagian besar kedua kelompok responden tidak membeli dan mengonsumsi produk pangan yang sudah melewati tanggal kedaluwarsa. Akan tetapi, sebagian besar kelompok responden laki-laki tidak menjadikan tanggal kedaluwarsa sebagai alasan utama untuk membuang produk, sedangkan kelompok responden perempuan menjadikan tanggal kedaluwarsa sebagai alasan utama untuk membuang produk. Analisis korelasi dengan Chi-Square menunjukkan jenis kelamin tidak mempengaruhi tingkat pengetahuan, kepedulian, dan sikap terhadap informasi tanggal kedaluwarsa., Expiration date is information that must be written on the label of packaged food products to provide information to consumers that the quality of the food product is still assured. This study aims to find out the concerns, knowledge, and attitudes of student in Jabodetabek area as consumers towards the expiration date on packaged food products. The research was done by a survey using the Google Forms application. Respondents were divided into two groups based on their gender, with the number of male respondent of 139 and female respondent of 171. The results showed that 86.3% of male respondents and 89.5% of female respondents had a habit of reading labels before buying food product. Both groups of respondents considered the expiration date as the main information considered when reading food labels while the product registration number (MD/ML/PIRT) was considered the least important. Label information on food packaging influences consumers in purchasing, both groups of respondents chose expiration date information as the most influential information in purchasing packaged food products. Both groups of respondents, mostly already knew the term expired date and best before. However, respondents still do not understand food products that are required to include an expiration date and which are not required to include an expiration date. Both groups of respondents had similar attitudes towards expiration date information. Most of respondents did not buy and consume food products that had passed the expiration date. However, most groups of male respondents did not make the expiration date the main reason for disposing of the product, while the female respondent group made
Keyword: Food labels, packaged foods, consumer knowledge, expiration date, surveys

Judul: Pengetahuan, persepsi risiko, dan perilaku membaca label kadaluarsa produk pangan
Abstrak: Label kadaluarsa terdiri atas tanggal, bulan, dan tahun yang dibuat oleh produsen untuk menentukan keamanan pangan dan petunjuk perubahan lain seperti cita rasa dan kandungan gizi. Penelitian ini bertujuan untuk menganalisis pengaruh faktor internal dan faktor eksternal terhadap pengetahuan, persepsi risiko, dan perilaku membaca label kadaluarsa. Penelitian dilakukan di Institut Pertanian Bogor (IPB). Teknik penarikan contoh yang digunakan adalah multistage random sampling dengan jumlah responden sebanyak 400 orang. Hasil penelitian menunjukkan bahwa tidak terdapat perbedaan pengetahuan, persepsi risiko, dan perilaku membaca antara laki-laki dan perempuan. Faktor internal, faktor eksternal, pengetahuan, dan persepsi risiko berpengaruh terhadap perilaku membaca. Namun secara parsial, hanya pendidikan ibu, mendapatkan informasi tentang label, dan persepsi risiko yang berpengaruh secara nyata terhadap perilaku membaca label kadaluarsa., The label of expire consists of date, month, and year that created by marketer to determine the food safety and the other changes of food such as taste and nutrition. This research analyzed the impacts of the internal factor and external factor on knowledge, risk perception, and the reading behavior of expired label. This research took place at Bogor Agricultural University. The sampling method used the multistage random sampling with 400 respondents. The result showed that there was not difference between male and female respondents in knowledge, risk perception, and reading behavior of expired label. Internal factor, external factor, knowledge, and risk perception affected on reading behavior. But partially, mother’s education, information about label, and risk perception affected on reading behavior.
Keyword: kadaluarsa, pengetahuan, persepsi risiko, perilaku membaca label

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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