Judul: Hubungan antara kebiasaan makan dengan kontrol diri
Abstrak: Kebiasaan makan adalah pola tingkah laku manusia yang berkaitan dengan sikap, kepercayaan, dan pemilihan dalam mengonsumsi makanan sehari-hari. Kebiasaan ini terbagi menjadi kebiasaan makan yang sehat dan tidak sehat. Kebiasaan makan memiliki keterkaitan dengan self-control. Self-control adalah perilaku seseorang dalam pengendalian diri dan perubahan reaksi menuju ke perilaku positif dan menghindari perilaku negatif. Penelitian terdahulu menyatakan self-control berkaitan dengan kebiasaan makan yang sehat. Sejauh ini, penelitian terkait kebiasaan makan dan self-control di Indonesia masih terbatas. Oleh karena itu, penelitian ini bertujuan mengetahui hubungan antara pola kebiasaan makan dengan self-control. Pengambilan data dilakukan dengan metode kuisioner online, yang terdiri dari kuisioner Diet History Questionnaire III (DHQ III) untuk mengetahui kebiasaan makan dan Self-Control Scale (SCS) untuk mengukur tingkatan self-control. Data makanan yang didapatkan di DHQ III diklasifikasikan dengan sistem NOVA. Hasil penelitian menunjukkan self-control yang lebih tinggi berkorelasi positif dengan meningkatnya jumlah makanan yang tidak diproses atau minim proses (NOVA 1). Hasil ini berbanding terbalik, semakin tinggi pengonsumsian makanan proses (NOVA 3) dan makanan diproses tinggi (NOVA 4), maka semakin rendah self-control. Self-control dipengaruhi oleh faktor demografi seperti BMI, frekuensi aktivitas olahraga, dan pendapatan., Eating habits are patterns of human behavior related to attitudes, beliefs, and choices in consuming food on a daily basis. These habits can be divided into healthy and unhealthy. Eating habits are closely related to self-control. Self-control refers to an individual's behavior in self-regulation and changing reactions toward positive behaviors while avoiding negative behaviors. Previous research found self-control is associated with healthy eating habits. However, studies on eating habits and self control in Indonesia are still limited. Therefore, this research aims to determine the relationship between eating habits and self-control. Data collection is conducted through an online questionnaire, which consists of the Diet History Questionnaire III (DHQ III) for eating habits and Self-Control Scale (SCS) to measure level of self-control. The food data obtained from DHQ III is classified using the NOVA system. The results of the study show that higher self-control is correlated with an increased consumption of unprocessed or minimally processed foods (NOVA 1). Otherwise, higher consumption of processed foods (NOVA 3) and ultra-processed foods (NOVA 4) is associated with lower self-control. Self-control also affected with BMI, frequency of physical activity, and income
Keyword: eating habits, food classification, NOVA, self-control, self-control scale

Judul: Hubungan antara  Uang Saku, Pengetahuan, dan Sikap dengan Frekuensi Konsumsi Makanan Cepat  Saji pada Siswa SMA Overweight dan Normal
Abstrak: Perkembangan era globalisai berdampak pada gaya hidup seperti pola makan yang sudah didominasi oleh makanan cepat saji. Kebiasaan makan seseorang dipengaruhi oleh pengetahuan dan sikap. Penelitian ini bertujuan untuk menganalisis hubungan uang saku, pengetahuan, dan sikap dengan frekuensi konsumsi makanan cepat saji pada siswa SMA overweight dan normal. Desain penelitian ini adalah cross sectional study yang melibatkan 68 subjek dari SMA Bosowa Bina Insani Bogor yang dipilih dengan random sampling. Pengumpulan data dilakukan dengan instrumen kuesioner google form, wawancara dan pengukuran antropometri. Hasil penelitian menunjukkan bahwa 47,1% responden memiliki uang saku yang tinggi, 52,2% dan 45,5% responden status gizi baik dan status gizi lebih memiliki pengetahuan yang baik, 76,1% dan 86,4% responden status gizi baik dan lebih memiliki sikap positif, 94,1% dan 80,9% responden jarang mengonsumsi makanan dan minuman cepat saji. Hasil analisis uji korelasi antara uang saku, pengetahuan, dan sikap dengan frekuensi konsumsi makanan cepat saji menunjukkan tidak terdapat hubungan yang signifikan (p>0,05)., The development of the globalization era has an impact on lifestyles such as eating patterns which are dominated by fast food. A person's eating habits are influenced by knowledge and attitudes. This study aims to analyze the relationship between pocket money, knowledge and attitudes with the frequency of fast food consumption in overweight and normal high school students. The design of this research is a cross sectional study involving 68 subjects from SMA Bosowa Bina Inani Bogor selected by random sampling. Data collection was carried out using a Google Form questionnaire instrument, interviews and anthropometric measurements. The results showed that 47.1% of respondents had high pocket money, 52.2% and 45.5% of respondents who had good nutritional status and overweight nutritional status had good knowledge, 76.1% and 86.4% of respondents who had good nutritional status and have a more positive attitude, 94.1% and 80.9% of respondents rarely consume fast food and drinks. The results of the correlation test analysis between pocket money, knowledge and attitudes and the frequency of fast food consumption show that there is no significant relationship (p>0.05).
Keyword: pengetahuan, Sikap, frekuensi makan, makanan cepat saji, uang saku

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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