Judul: Pengetahuan Gizi dan Keamanan Pangan serta Kebiasaan Jajan Anak di SD Negeri Sukadamai 03 Bogor dan SD Negeri Situgede 04 Bogor.
Abstrak: This study was aimed to examine the relationship between nutrition and food safety knowledge and snack habit among elementary school children in SDN Sukadamai 03 Bogor as represent high social economic status (SES) and SDN Situgede 04 Bogor represent low SES. This research was a cross-sectional study involving 283 students. Data collection using self administered quesstionnaire. The results show that children with low category of nutrition knowledge in high SES (19.9%) is lower than that in low SES (62.2%), while for food safety knowledge, no high SES children was found with low category whereas in low SES were 11.8%. Snack food commonly eaten by children in both SES were extrudat products. Number of kind snacks consumed by low SES children were higher (>7) than that of high SES (5-7). Nutritional status of most children in both SES were normal. Contribution of snack to energy and nutrients intake ranged from 8.6% (vitamin C) to 15% (energy) while the contribution to energy and nutrients adequacy were ranged from 7.2% (vitamnin C) to 16.1% (calcium). Correlation analysis showed significant relationship between nutrition knowledge, food safety knowledge and snack habits with amount of pocket money (p<0.05), nutritional status (p<0.05) and father and mother education (p<0.05).
Keyword: high SES, low SES, snack habit, food safety knowledge, nutrition knowledge

Judul: Hubungan Pengetahuan serta Sikap Gizi dan Keamanan Pangan dengan Kebiasaan Jajan dan Status Gizi Siswa
Abstrak: Anak usia sekolah dasar cenderung memiliki kebiasaan jajan dan belum memiliki pengetahuan serta sikap yang baik terkait gizi keamanan pangan. Tujuan penelitian adalah menganalisis hubungan pengetahuan serta sikap gizi dan keamanan pangan dengan kebiasaan jajan dan status gizi siswa. Penelitian menggunakan desain cross sectional serta melibatkan 71 subjek kelas IV dan V SDN Ciawi 02. Penelitian dilakukan bulan Mei 2024 melalui wawancara, pengisian kuesioner, serta pengukuran antropometri. Instrumen pengetahuan dan sikap diukur menggunakan kuesioner terstruktur, asupan dengan Food Recall serta Food Frequency Questionnaire, dan status gizi dengan berat dan tinggi badan. Mayoritas subjek memiliki pengetahuan sedang (63,4%) dan sikap netral (54,9%), tergolong sering jajan (76,1%), kontribusi zat gizi jajanannya berlebih (>20% ), dan status gizinya tergolong normal (69%). Hasil penelitian menunjukkan tidak terdapat hubungan signifikan antara pengetahuan serta sikap gizi dan keamanan pangan dengan kebiasaan jajan dan status gizi subjek (p>0,05). Faktor yang berpengaruh terhadap asupan energi jajanan adalah jenis kelamin, usia, pendidikan ayah, pekerjaan ayah, pendidikan ibu, pendapatan ibu, dan sikap subjek (p<0,05). Faktor yang berpengaruh terhadap asupan protein jajanan adalah jenis kelamin, usia, pekerjaan ayah, dan pendidikan ibu (p<0,05). Faktor yang berpengaruh terhadap asupan lemak jajanan adalah jenis kelamin, usia, pekerjaan ayah, pendidikan ibu, dan sikap subjek (p<0,05)., Elementary school-age children have snacking habits and not yet having good knowledge and attitudes related to food safety nutrition. The purpose was to analyze relationship between knowledge and attitudes towards nutrition and food safety with snacking habits and nutritional status. The study used a cross-sectional design and involved 71 subjects of class IV and V SDN Ciawi 02. The study was conducted in May 2024 through interviews, filling out questionnaires, and anthropometric measurements. Knowledge and attitude instrument measured using structured questionnaires, intake with Food Recall and Food Frequency Questionnaire, and nutritional status with weight and height. The majority of the subjects had moderate knowledge (63.4%), neutral attitudes (54.9%), were classified as frequent snacks (76.1%), their snack nutrient contribution was excessive (>20%), and their nutritional status classified as normal (69%). There was no significant relationship between knowledge and attitudes with snacking habits and nutritional status of subjects (p>0.05). Factors that influence the energy intake of snacks are gender, age, father's education, father's occupation, mother's education, mother's income, and subject's attitude (p<0.05). Factors affecting snack protein intake are gender, age, father's occupation, and mother's education (p<0.05). Factors influencing snack fat intake are gender, age, father's occupation, mother's education, and subject's attitude (p<0.05).
Keyword: pengetahuan gizi, sikap gizi, status gizi, kebiasaan jajan, siswa sekolah dasar

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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