Judul: Household Resilience for Food Security during The Covid-19 Pandemic
Abstrak: Pandemi Covid-19 berdampak pada sektor pangan rumah tangga komunitas adat, terutama dalam hal akses pangan dan ketersediaan pangan. Tujuan penelitian ini adalah mengidentifikasi bagaimana resiliensi dalam ketahanan pangan pada komunitas adat pada masa pandemi Covid-19. Penelitian ini menggunakan metode survei melalui kuesioner dan didukung penjelasan kualitatif melalui wawancara mendalam dan observasi lapang. Teknik pemilihan responden dilakukan secara cluster random sampling kepada 60 rumah tangga pada komunitas adat di Kampung Adat Cireundeu dan informan ditentukan dengan menggunakan teknik purposive. Hasil penelitian ini menunjukkan bahwa rumah tangga pada komunitas adat tergolong resilien dalam hal pangan. Faktor-faktor yang memengaruhi resiliensi dalam ketahanan pangan rumah tangga adalah ada dan besarnya cadangan pangan yang disimpan oleh masing-masing rumah tangga. Cadangan pangan tersebut diperoleh dari hasil panen pada lahan pertanian yang terdapat di wilayah kampung adat dan diproduksi oleh masing-masing rumah tangga., The Covid-19 pandemic has had an impact on the food sector of indigenous peoples' households, especially in terms of food access and food availability. The purpose of this study is to identify resilience in food security in indigenous communities during the Covid-19 pandemic. This research used a survey method through a questionnaire and was supported by qualitative explanations through in- depth interviews and field observations. The respondent selection technique was carried out by cluster random sampling to 60 households in indigenous communities in the Cireundeu Traditional Village and informants were determined using purposive techniques. The results of this study show that households in indigenous communities are classified as resilient in terms of food. The factors that affect resilience in household food security are the presence and magnitude of food reserves stored by each household. These food reserves are obtained from crops on agricultural land found in traditional village areas and produced by each household.
Keyword: covid-19 pandemic, food security, indigenous communities

Judul: Dampak Pandemi Covid-19 Terhadap Ketahanan Pangan Indonesia: Sebuah Penelitian Eksploratif
Abstrak: Awal tahun 2020, seluruh dunia dihadapkan dengan kondisi darurat yaitu pandemi Covid-19. Indonesia merupakan salah satu dari 215 negara yang terkena pandemi Covid-19. Pangan merupakan kebutuhan dasar manusia untuk mempertahakan hidup. Oleh karena itu, kondisi ketahanan pangan di masa pandemi Covid-19 menjadi hal yang serius untuk diperhatikan sebab menyangkut dengan pemenuhan kebutuhan masyarakat. Penelitian ini ditujukan untuk mengkaji secara mendalam bagaimana dampak pandemi Covid-19 terhadap ketahanan pangan Indonesia. Penelitian ini merupakan penelitian eksploratif berbasis studi literatur dengan metode analisis deskriptif kualitatif dan analisis SWOT. Berdasarkan hasil penelitian, kondisi ketahanan pangan Indonesia sebelum pandemi Covid-19 sudah bermasalah dalam keterjangkauan pangan, ketersediaan pangan, dan harga pangan. Dampak pandemi-19 sangat berpengaruh terhadap indikator ketahanan pangan berupa ketersediaan pangan, keterjangkuan pangan, dan stabilitas harga pangan. Penelitian ini menemukan tiga hipotesis mengenai dampak pandemi Covid-19 terhadap indikator ketahanan pangan. Berdasarkan analisis SWOT, terdapat 8 strategi untuk mempertahankan ketahanan pangan Indonesia pasca Covid-19, Early in 2020, the whole world was faced with an emergency, namely the Covid-19 pandemic. Indonesia is one of 215 countries affected by the Covid-19 pandemic. Food is a basic human need to sustain life. Therefore, the condition of food security during the Covid-19 pandemic is a serious matter to pay attention to because it involves meeting people's needs. This research is intended to examine in depth how the impact of the Covid-19 pandemic on Indonesia's food security. This research is an exploratory research based on literature study using qualitative descriptive analysis method and SWOT analysis. Based on the research results, the condition of Indonesia's food security before the Covid-19 pandemic was already problematic in terms of food affordability, food availability and food prices. The impact of pandemic-19 greatly affects food security indicators in the form of food availability, food affordability and food price stability. This study found three hypotheses regarding the impact of the Covid-19 pandemic on indicators of food security. Based on the SWOT analysis, there are 8 strategies to maintain Indonesia's food security after Covid-19.
Keyword: Indonesia, Ketahanan Pangan, Pandemi Covid-19, Penelitian Eksploratif

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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