Judul: Profile Clean and Healthy Lifestyle and Food Consumption of Adolescents to Prevent the Transmission of Covid-19
Abstrak: Penelitian bertujuan menganalisis profil Perilaku Hidup Bersih dan Sehat (PHBS) dan mempelajari konsumsi pangan remaja dalam mencegah penularan Covid-19. Desain penelitian ini adalah cross sectional dengan jumlah subjek 102 orang yang dipilih secara purposive sampling. Pengambilan data dilakukan dengan pengisian kuesioner dan FFQ self-administered secara daring dan wawancara Recall 2x24 Hours melalui telepon. Sikap subjek menghadapi Covid-19 sebagian besar tergolong baik (55,3%). PHBS subjek dalam mencegah Covid-19 memiliki persentase baik dan kurang baik yang sama (50%). Perilaku makan sebagian besar tergolong baik (57,8%). Tingkat kecukupan rata-rata energi, protein, lemak, karbohidrat, vitamin A, dan vitamin C subjek tergolong defisit, namun Fe dan Zn tergolong cukup Terdapat hubungan signifikan (p<0,05) antara sikap menghadapi Covid-19 dengan jenis kelamin (p=0,016), usia (p=0,038), dan pekerjaan ibu (p=0,042). Penerapan PHBS dalam mencegah Covid-19 memiliki hubungan signifikan (p<0,10) untuk pendidikan ibu (p=0,053), pekerjaan ayah (p=0,083), pekerjaan ibu (p=0,007), dan pendapatan keluarga (p=0,011). Terdapat hubungan sangat signifikan (p<0,01) antara perilaku makan dalam mencegah Covid-19 dengan status gizi (p=0,004). Tidak terdapat hubungan signifikan antara sikap subjek menghadapi Covid-19 terhadap PHBS dan perilaku makan, namun terdapat hubungan searah positif sangat signifikan (p<0,01) antara PHBS dan perilaku makan (p=0,000, r=0,414)., The research aims to analyze profile Clean and Healthy Life Style (PHBS) and food consumption of adolescents to prevent the transmission of Covid-19. The design of this study was cross-sectional with 102 subjects selected by purposive sampling. Data were collected by filling out self-administered online questionnaires and FFQ, and Recall 2x24 Hours by telephone. Most of the subjects' attitudes towards Covid-19 were good (55.3%). PHBS subjects to prevent Covid-19 have the same percentage 50% for good and not good. Most of the eating behavior is classified as good (57.8%). The average adequacy level of energy, protein, fat, carbohydrates, vitamin A, and vitamin C is classified as a deficit, but Fe and Zn are considered sufficient. There is a significant relationship (p<0.05) between attitudes towards Covid-19 with gender (p=0.016), age (p= 0.038), and mother's occupation (p=0.042). The implementation of PHBS to prevent Covid-19 had a significant relationship (p<0.10) between the mother's education (p=0.053), father's occupation (p=0.083), mother’s occupation (p=0.007) and family income (p=0.011). There is a significant relationship (p<0.01) between eating behavior to prevent Covid-19 and nutritional status (p=0.004). There is no significant relationship between the subject's attitude towards Covid-19 with PHBS and eating behavior, but there is a significant positive direction relationship (p<0.01) between PHBS and eating behavior (p=0.000, r=0.414).
Keyword: Adolescents, Covid-19, eating behavior, food consumption, PHBS

Judul: Correlation between Nutrition Knowledge, Physical Activity, and Eating Habits among College Students during COVID-19 Pandemic
Abstrak: Kondisi pandemi Covid-19 memengaruhi kebiasaan makan dan aktivitas fisik yang dapat beresiko obesitas, sehingga diperlukan pengetahuan gizi dan gaya hidup yang sehat. Penelitian ini bertujuan menganalisis hubungan pengetahuan gizi, aktivitas fisik dan kebiasaan makan mahasiswa selama pandemi Covid-19. Desain penelitian ini adalah cross sectional melibatkan 83 mahasiswa yang berdomisili di Jabodetabek. Data pengetahuan gizi dan aktivitas fisik dikumpulkan dengan self-administered menggunakan google form, sedangkan data kebiasaan makan melalui wawancara online. Hasil penelitian menunjukkan pengetahuan gizi 83,1% subjek tergolong baik. Tingkat aktivitas fisik hampir separuh subjek (43,4%) tergolong berat dan rata-rata waktu duduk subjek 6,8 jam/hari. Kebiasaan makan mahasiswa belum sesuai anjuran pedoman gizi seimbang. Tingkat kecukupan energi dan karbohidrat subjek tergolong defisit berat, tetapi tingkat kecukupan protein dan lemak tergolong normal. Hampir 2/3 subjek memiliki tingkat kecukupan zat gizi mikro tergolong kurang. Terdapat hubungan positif (<0,05) antara pendidikan ibu dengan tingkat kecukupan lemak dan vitamin E, serta konsumsi daging sapi, kangkung, selada, mangga, dan sosis. Pendapatan orang tua berhubungan positif dengan konsumsi roti gandum, kurma, dan tahu (p<0,05). Tidak terdapat hubungan (p>0,05) antara pengetahuan gizi dengan tingkat kecukupan gizi, namun berhubungan positif dengan konsumsi ubi, buncis, salak, dan sosis (p<0,05). Tidak terdapat hubungan antara aktivitas fisik dengan kebiasaan makan (p>0,05), The Covid-19 pandemic affects eating habits and physical activity that can risk obesity; therefore, knowledge of nutrition and a healthy lifestyle are needed. This study analyzes the correlation between nutrition knowledge, physical activity, and eating habits among college students during the Covid-19 pandemic. This study used a cross-sectional design involving 83 students in Jabodetabek. The data were collected via google form and through online interviews. The results showed 83,1% of subjects had good nutrition knowledge. The physical activity level of 43,4% of subjects was classified as high, and the average sitting time was 6,8 hours/day. Students' eating habits are not yet meet the nutrition guidelines. Energy and carbohydrate adequacy were severe deficits, but the protein and fat were normal. Almost 2/3 of the subjects had low micronutrient adequacy. There was a positive correlation (<0,05) between maternal education and fat and vitamin E adequacy and intake of several foods. Parental income was positively related to intake of frequence of some food (p<0,05). There was no correlation (p>0,05) between nutrition knowledge and nutrient adequacy, between physical activity and eating habits (p>0,05), but it was positively related to intake of several foods (p<0,05).
Keyword: College student, Covid-19 pandemic, Eating habits, Nutrition knowledge, Physical activity, Aktivitas fisik, Kebiasaan makan, Mahasiswa, Pengetahuan gizi

Judul: The Solution of Nonlinear Volterra Integral Equation using Linearization Method.
Abstrak: Many natural phenomena can be explained by mathematical models. One of those models is in the form of Volterra integral equation, which is usually nonlinear. Analitically, a nonlinear form is difficult to solve. Therefore, this research is aimed to discuss solution of Volterra integral equation using linearization method. Linearization is done to nonlinear integrand with Taylor series expansion. According to this linearization, a numerical solution of Volterra integral equation is obtained using MATLAB 7.0.1 software. Validity of this method is tested by comparing the approximate with the exact solution. The result of this research shows that the numerical solution agree with the exact solution quite well.
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