Judul: Coping Strategy for MSMEs during the COVID-19 Pandemic in PIK Kopti Semanan West Jakarta
Abstrak: Pandemi COVID-19 sangat berdampak pada bisnis kecil seperti UMKM di seluruh Indonesia termasuk kepada pengrajin tempe dan tahu Pusat Industri Kecil (PIK) Koperasi Produsen Tempe Tahu Indonesia (Kopti) Semanan, Kota Jakarta Barat. Penelitian ini bertujuan untuk mengkaji apa saja permasalahan yang dihadapi oleh pengrajin tempe PIK Kopti Semanan dan bagaimana strategi pengrajin tersebut untuk bertahan pada masa pandemi COVID-19. Penelitian ini menggunakan data primer dengan metode analisis deskriptif. Teknik pengambilan sampel yang dilakukan non probability sampling dengan metode purposive sampling. Sampel penelitian ini yaitu 7 orang pengrajin tempe yang berada di PIK Kopti Semanan. Permasalahan utama yang dialami oleh pengrajin yaitu meningkatnya harga bahan baku serta permintaan produk yang menurun pada saat pandemi yang mengakibatkan keuntungan menurun. Coping strategy untuk menekan penurunan omset dan keuntungan usaha yaitu dengan mengecilkan ukuran produk. Coping strategy tersebut berhasil menekan penurunan omset dan keuntungan usaha pada saat pandemi., The COVID-19 pandemic has had a huge impact on small businesses such as MSMEs throughout Indonesia, including tempe and tofu craftsmen, the Small Industry Center (PIK) of the Indonesian Tofu Tempe Producers Cooperative (Kopti) Semanan, West Jakarta City. This study aims to examine what are the problems faced by PIK Kopti Semanan tempe producers and how the craftsmen's strategies are to survive during the COVID-19 pandemic. This study uses primary data with a descriptive analysis method. The sampling technique used was non-probability sampling with purposive sampling method. The sample of this research were 7 tempe craftsmen who were at PIK Kopti Semanan. The main problem experienced by craftsmen is the increasing price of raw materials and decreased demand for products during the pandemic which resulted in decreased profits. The coping strategy to reduce the decrease in turnover and business profits is to reduce the size of the product. This coping strategy was successful in reducing business turnover and profits during the pandemic.
Keyword: coping strategy, COVID-19, MSMEs, omzet, profit

Judul: Vulnerability Analysis and Livelihood Adaptation of MSME Entrepreneurs in Responding to the Covid-19 Pandemic (Case: Tegal Waru MSME Entrepreneur, Ciampea District, Bogor Regency)
Abstrak: Kebijakan PSBB dan PPKM untuk menekan angka penyebaran virus Covid-19 mengubah tatanan kehidupan masyarakat karena masyarakat harus melakukan aktivitas dari rumah. Rumah tangga pengusaha UMKM menjadi rentan akibat sumber ekonominya melemah dan membutuhkan strategi adaptasi agar dapat bertahan di tengah guncangan tersebut. Berbagai bentuk modal nafkah yang dapat diakses rumah tangga harus dimanfaatkan semaksimal mungkin. Tujuan dari penelitian ini adalah menganalisis kerentanan dan upaya adaptasi nafkah pengusaha UMKM dalam merespons pandemi Covid-19. Metode yang digunakan adalah metode kuantitatif melalui kuesioner dan didukung data kualitatif dari wawancara secara mendalam. Dari hasil penelitian didapatkan bahwa rumah tangga pengusaha UMKM relatif rentan terhadap pandemi Covid-19. Namun, tidak terdapat hubungan antar kerentanan nafkah dengan strategi adaptasi., The PSBB and PPKM policies to reduce the spread of the Covid-19 virus have changed the order of people's lives because people have to carry out activities from home. MSME entrepreneur households are vulnerable due to weak economic resources and require adaptation strategies in order to survive in the midst of these shocks. Various forms of livelihood capital that are accessible to households should be utilized as much as possible. The purpose of this study is to analyze the vulnerability and adaptation efforts of MSME entrepreneurs in responding to the Covid-19 pandemic. The method used is a quantitative method through a questionnaire and is supported by qualitative data from in-depth interviews. From the results of the study, it was found that the households of MSME entrepreneurs were relatively vulnerable to the Covid-19 pandemic. However, there is no relationship between livelihood vulnerability and adaptation strategies.
Keyword: Livelihood Vulnerability Index, Livelihood Capital, Livelihood Adaptation Strategy

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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