Judul: Pengaruh pengetahuan gizi terhadap sikap dan kebiasaan jajan serta sumbangan jajanan terhadap kecukupan zat gizi  : (Studi kasus di SD Percobaan Negeri Sabang dan SD Negeri Ciujung, Kelurahan Cihapit, Kecamatan Bandung Wetan, Kotamadya Bandung, Propinsi Jawa Barat)
Abstrak: Tujuan penelitian ini adalah untuk mengetahui pengaruh pengetahuan gizi terhadap sikap dan kebiasaan jajan murid SD serta sumbangan jajanan terhadap kecukupan energi, protein, vitamin A, dan zat besi murid SD. Kedua SD diambil secara "purposif". Sampel diambil sebanyak 30 orang di masing-masing sekolah secara "acak sederhana". Data primer yang dikumpulkan meliputi: berat badan, umur, jenis kelamin, jumlah keluarga, dan anak ke berapa diperoleh dengan cara tertulis. Data pengetahuan gizi dan kebiasaan jajan sampel diperoleh dengan tertulis sedang data sikap jajan diperoleh dengan cara tertulis dan wawancara. Konsumsi makanan anak selama dua hari berturut-turut di peroleh dengan cara "recall".
Keyword: pengetahuan gizi

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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