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: Analysis of Covid-19 Knowledge, Intake, Eating Behavior,  Stress Level, and Quality of Life in Students during Pandemic
Abstrak: Penelitian ini bertujuan menganalisis hubungan tingkat pengetahuan terkait Covid-19, asupan makanan, perilaku makan, tingkat stres, dan kualitas hidup mahasiswa saat pandemi. Desain penelitian ini adalah studi cross sectional dengan jumlah subjek sebanyak 81 mahasiswa Gizi Masyarakat, Institut Pertanian Bogor yang dipilih secara purposif. Penelitian dilakukan pada bulan Juli 2022–September 2022. Pengumpulan data melalui wawancara dan kuesioner online. Tingkat pengetahuan terkait Covid-19 pada subjek tergolong dalam kategori sedang (60%). Rata-rata skor perilaku makan pada subjek paling banyak yaitu perilaku makan external eating. Sebagian besar (46%) subjek mengalami stres sedang. Hasil analisis menunjukkan bahwa terdapat hubungan yang signifikan antara tingkat stres dengan emotional eating, domain hubungan sosial dan domain lingkungan pada kualitas hidup (p<0,05). Selain itu, terdapat hubungan yang signifikan juga antara variabel uang saku dengan tingkat stres (p<0,05). Tidak ada hubungan yang signifikan antara pengetahuan Covid-19 dengan tingkat stres (p>0,05). Hal ini juga terjadi hubungan yang tidak signifikan antara variabel jenis kelamin, usia, tempat tinggal, ketersediaan internet, dan angkatan dengan tingkat stres (p>0,05). Begitupula dengan variabel tingkat stres dengan tingkat kecukupan zat gizi makro dan mikro, perilaku makan external eating dan restrained eating, serta domain fisik dan psikologis pada kualitas hidup (p>0,05) yang juga menunjukkan tidak adanya hubungan yang signifikan., The aims of this study is to analyze the correlation between Covid-19 knowledge, food intake, eating behavior, stress level, and quality of life during pandemic. The design of this research is cross sectional study with 81 subjects of community nutrition, IPB University students selected by purposive sampling. This research was conducted in July 2022–September 2022. Data was collected through interview and online questionnaire. The level of Covid-19 knowledge of the subjects is in the medium category. The average score of eating behavior in the most subjects is external eating. Most of the subjects (46%) experienced moderate stress. The result showed that there was significant correlation between stress level with emotional eating, social relationship and environmental health in quality of life (p<0.05). There was a significant correlation between allowance with stress levels (p<0.05). There was no significant correlation between Covid-19 knowledge with stress level (p>0.05). Also, there was no significant correlation between gender, age, residence, internet network, and years of college with stress level (p>0.05). The same for variables of stress levels with the level of adequacy of macro and micro nutrients, external eating and restrained eating, physical and psychological in quality of life (p>0.05) also showed no significant correlation.
Keyword: Covid-19 knowledge, Eating behavior, Nutrient adequacy level, Stress  level, Quality of life

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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