Judul: Factors Related with Vegetables and Fruits Consumption among IPB University Students During the Distance  Learning Period
Abstrak: Pandemi covid-19 menyebabkan diterapkannya sistem Pembelajaran Jarak Jauh (PJJ) pada mahasiswa IPB yang juga mengubah pola konsumsi makanannya termasuk sayur dan buah. Tujuan penelitian ini ialah mengetahui faktor-faktor yang berhubungan dengan konsumsi sayur dan buah pada mahasiswa IPB selama PJJ. Penelitian ini dilakukan pada November 2020 menggunakan desain studi cross sectional dengan metode pengambilan sampel non-probability accidental sampling yang melibatkan 66 subjek dari mahasiswa semester 3 IPB. Faktor-faktor yang menjadi fokus penelitian ini ialah karakteristik subjek, karakteristik sosial ekonomi keluarga subjek, ketersediaan sayur dan buah di rumah, suku subjek, wilayah tempat tinggal, preferensi sayur dan buah, serta waktu mengenal sayur dan buah. Terdapat hubungan signifikan negatif konsumsi sayur dengan pendidikan ayah (p=0,020, r=-0,287) serta hubungan signifikan positif konsumsi buah dengan preferensi buah (p=0,000, r=0,000). Terdapat perbedaan signifikan konsumsi sayur antara subjek yang tinggal di kota dengan subjek yang tinggal di desa (p=0,039)., The COVID-19 pandemic led to the implementation of the Distance Learning (PJJ) system for IPB students who also changed their food consumption patterns, including vegetables and fruit. The purpose of this study to know the related factors with the vegetables and fruit consumption among IPB University students during PJJ. This research was conducted in November 2020 using a cross sectional study design with a non-probability accidental sampling method involving 66 subjects from 3rd semester students. The factors that become a focus of this research are the subject characteristics, socio-economic of subject's family, the availability of vegetables and fruit at home, the subject's ethnicity, the residential area, preferences of vegetables and fruits, and the time to know vegetables and fruits. There is a significant negative relationship of vegetable consumption with father's education (p=0.020, r=-0.287) and a significant positive relationship of fruit consumption with fruit preference (p=0.000, r=0.000). There was a significant difference of vegetable consumption between subjects who living in cities and subjects living in villages (p=0.039).
Keyword: college student, distance learning, vegetable and fruit consumption

Judul: Vegetable and Fruit Consumption Patterns During Covid-19 Pandemic in Adolencent in Pariaman City
Abstrak: Konsumsi sayur dan buah remaja masih tergolong kurang. Konsumsi sayur dan buah merupakan salah satu langkah pencegahan Covid-19 untuk meningkatkan imunitas tubuh. Penelitian ini bertujuan menganalisis hubungan jenis kelamin, pengetahuan dan sikap gizi, ketersediaan, dan preferensi konsumsi sayur dan buah serta tingkat kecemasan dengan konsumsi sayur dan buah remaja di masa pandemi Covid-19. Desain penelitian ini adalah cross-sectional study dengan 95 orang contoh yang dilakukan pada bulan Desember 2020－Januari 2021 di SMPN 2 Pariaman. Contoh dipilih secara purposive dengan pengumpulan data primer melalui kuesioner dan wawancara. Konsumsi sayur contoh dalam penelitian ini tergolong kurang (77,9%) dan konsumsi buah tergolong cukup (89,5%). Konsumsi sayur dan buah contoh dalam penelitian ini berhubungan secara signifikan dengan arah positif dengan sikap gizi contoh (P value=0,011). Sementara itu, pengetahuan gizi, tingkat kecemasan contoh selama pandemi Covid-19 tidak memiliki hubungan yang signifikan dengan konsumsi sayur dan buah. Ketersediaan sayur dan buah di rumah tidak berhubungan dengan preferensi konsumsi sayur dan buah dan preferensi contoh juga tidak berhubungan dengan konsumsi sayur dan buah contoh., Consumption of vegetables and fruit in adolescents is still relatively low. The Covid-19 pandemic has affected the habit of consuming vegetables and fruit. Consumption of vegetables and fruit is one of the steps to prevent Covid-19 to increase body immunity. This study aims to analyze the relationship between, nutritional knowledge and attitudes, availability, and preferences for consumption of vegetables and fruit as well as anxiety levels with the consumption of vegetables and fruit in adolescents during the Covid-19 pandemic. The design of this research is a cross-sectional study with 95 samples which was conducted in December 2020 －January 2021 at SMPN 2 Pariaman. Samples were selected purposively and used primary data through questionnaires and interviews. Consumption of vegetable samples in this study is classified as less (77,9%) and fruit consumption is quite adequate (89,5%). The consumption of vegetables and fruit samples in this study was significantly related to nutritional attitudes (P value = 0,011). Meanwhile, knowledge of nutrition, level of anxiety during the Covid-19 pandemic which did not have a significant relationship with consumption of vegetables and fruit. The availability of vegetables and fruit at home is not related to the consumption preferences of vegetables and fruit and sample preferences are also not related to the consumption of vegetables and fruit samples.
Keyword: Adolencent, factor that affect, vegetable and fruit consumption

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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