Judul: Food Consumption Patterns of Sugar, Salt, and Fat Sources and its Relationship with Obesity among Adolescent
Abstrak: Kegemukan remaja mengalami peningkatan yang sangat pesat. Asupan gula, garam, dan lemak yang tinggi dapat menyebabkan kejadian kegemukan. Tujuan dari penelitian cross-sectional ini untuk menganalisis pola konsumsi gula, garam, dan lemak pada remaja (16–18 tahun) di SMAN 6 Jakarta. Subjek diwawancarai dengan menyebarkan kuesioner untuk mengumpulkan data sosio-demografi, pengetahuan, sikap, antropometri serta Semi Quantitative-Food Frequency Questionnaire (SQ-FFQ) untuk mengumpulkan konsumsi pangan. Mayoritas subjek yang berstatus gizi gemuk didominasi oleh laki-laki. Sebagian besar keluarga subjek tergolong kecil dengan rata-rata uang saku per bulan Rp Rp1.508.281,00 ± Rp909.615,00. Mayoritas pendidikan terakhir orangtua dari perguruan tinggi dengan ayah berwiraswasta sedangkan ibu tidak bekerja. Rata-rata asupan gula, garam, dan lemak pada remaja dengan status gizi normal berturut-turut sebesar 54,8 ± 26,9 g; 2522,2 ± 834 mg; 74,3 ± 19,4 g. Rata-rata asupan gula, garam, dan lemak status gizi gemuk berturut-turut sebesar 51,2 ± 27,6 g; 2914,1 ± 957 mg; 81,6 ± 28,3 g. Semakin besar uang saku mengindikasikan semakin buruknya perilaku makan sehat. Tidak ditemukan adanya hubungan antara karakteristik keluarga, pengetahuan, sikap, dan status gizi dengan asupan gula, garam, dan lemak. Asupan gula, garam, dan lemak saling berkorelasi positif antar satu sama lain., Obesity in adolescent has increased rapidly. High sugar, salt, and fat intake have been reported causing obesity. The aim of this present cross-sectional study was to analyze consumption pattern of sugar, salt, and fat in adolescent (16–18 years old) at SMAN 6 Jakarta. The participants were interviewed using a questionnaire to collect information on socio-demographic, knowledge, attitude, anthropometric variables and Semi Quantitative-Food Frequency Questionnaire (SQ-FFQ) to assess dietary intakes. Subject with obesity was higher in men. Most subject has small family member with the average of monthly pocket money was Rp1.508.281,00 ± Rp909.615,00. Sugar, salt, and fat intake in normal adolescent were 54,8 ± 26,9 g, 2522,2 ± 834 mg, 74,3 ± 19,4 g. Sugar, salt, and fat intake in obese adolescent were 51,2 ± 27,6 g, 2914,1 ± 957 mg, 81,6 ± 28,3 g. Higher pocket money was associated with decreased healthy eating behavior. There is no correlation between family characteristic, knowledge, attitude, and nutritional status with sugar, salt, and fat intake. Sugar, salt, and fat intake were positively correlated with one another.
Keyword: sugar, salt, fat, obesity, adolescent

Judul: The Correlation Analysis of Food Consumption Quality and Fat Intake with Nutritional Status of Female Adolescents.
Abstrak: Konsumsi lemak pada remaja seringkali berdampak pada kualitas konsumsi pangannya sehingga berdampak pula pada status gizinya. Oleh karena itu, penelitian ini bertujuan untuk menganalisis hubungan antara kualitas konsumsi pangan dan asupan lemak dengan status gizi pada remaja putri SMA Negeri 33 Jakarta. Desain penelitian ini adalah cross sectional study dengan subjek sebanyak 62 orang yang dipilih secara purposive sampling. Subjek terbagi dalam dua kelompok, yaitu 31 orang berstatus gizi lebih dan 31 orang berstatus gizi normal. Data dikumpulkan melalui pengisian google form dan wawancara melalui telepon. Hasil penelitian menunjukkan bahwa asupan lemak, kontribusi lemak terhadap kebutuhan energi, dan kualitas konsumsi pangan pada subjek berstatus gizi lebih tidak berbeda signifikan (p>0,05) dengan subjek berstatus gizi normal. Berdasarkan hasil uji korelasi Chi-square menunjukkan bahwa terdapat hubungan signifikan (p=0,005) antara pekerjaan ayah dengan status gizi. Hasil uji korelasi Spearman menunjukkan bahwa terdapat hubungan signifikan positif (r=0,251, p=0,049) antara pendidikan ibu dengan kualitas konsumsi pangan. Hal ini berarti bahwa semakin tinggi pendidikan yang dimiliki ibu maka kualitas konsumsi pangan anak semakin baik. Hasil uji korelasi Spearman menunjukkan bahwa tidak terdapat hubungan yang signifikan (p>0,05) antara asupan lemak, kontribusi lemak terhadap kebutuhan energi, dan kualitas konsumsi pangan dengan status gizi. Kata kunci: asupan lemak, kualitas konsumsi pangan, remaja putri, status gizi, Fat consumption in adolescents often has an impact on the quality of their food consumption, which also has an impact on their nutritional status. This study aimed to analyze the correlation between food consumption quality and fat intake with nutritional status of female adolescents at SMA Negeri 33 Jakarta. This cross-sectional study involved 31 overweight subjects and 31 subjects with normal nutritional status. The data was obtained through filling out of online google forms and telephone interview. The results showed that the food consumption quality, fat intake, and the contribution of fat to energy requirement of overweight subjects were not significantly (p>0.05) different with normal nutritional status of subjects. Chi-square’s correlation test showed a significant correlation (p=0.005) between father’s occupation with nutritional status. Spearman’s correlation test showed that there was a significant positive correlation (r=0.251, p=0.049) between maternal education levels and the food consumption quality. This indicated that the higher the level of mother’s education, the better the food consumption quality of her child. The food consumption quality, fat intake, and its contribution to energy requirement were not significantly (p>0.05) correlated with subject’s nutritional status. Keywords: fat intake, female adolescents, food consumption quality, nutritional status
Keyword: Fat intake, female adolescents, food consumption quality, nutritional status

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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