Judul: Marketing Strategy for the Dapur Tahu Cafe in Padang City during the Covid-19 Pandemic
Abstrak: Dapur Tahu merupakan cafe yang menyediakan berbagai menu olahan tahu. Pada masa pandemi Covid-19, Dapur Tahu mengalami penurunan pendapatan. Tujuan dari penelitian ini untuk mengidentifikasi faktor internal dan eksternal, merumuskan alternatif strategi dan menetapkan strategi pemasaran yang diprioritaskan untuk diterapkan oleh Dapur Tahu. Metode yang digunakan dalam penelitian ini adalah analisis deskriptif dan analisis tiga tahap formulasi strategi. Alat analisis yang digunakan adalah matriks IFE, matriks EFE, matriks IE, matriks SWOT, dan matriks QSP. Hasil analisis matriks IFE menghasilkan Dapur Tahu memiliki sepuluh kekuatan dan dua kelemahan, dan pada matriks EFE menghasilkan Dapur Tahu memiliki memiliki lima peluang dan enam ancaman. Berdasarkan hasil analisis matriks IE, menunjukkan bahwa Dapur Tahu berada pada posisi tumbuh dan membangun. Analisis matriks SWOT didapatkan delapan alternatif strategi. Prioritas strategi yang dihasilkan dari QSPM adalah meningkatkan kegiatan promosi secara online dan offline. Saran untuk Dapur Tahu antara lain melakukan kegiatan promosi secara lebih gencar dari sebelumnya, memberikan pelayanan yang lebih pro pada penanganan Covid-19, mengoptimalkan penggunaan teknologi informasi dan komunikasi,dan menambah dekorasi interior., Dapur Tahu is a cafe that provides a variety of processed tofu menus. During the Covid-19 pandemic, Dapur Tahu experienced a decrease in income. The purpose of this research is to identify the internal and external factors, to formulate alternative strategies and to set prioritiezed marketing strategies which can be applied by Dapur Tahu. The methods used in this reasearch is the descriptive analysis and three stage formulation analysis. The tools of analysis that used are IFE matrix, EFE matrix, IE matrix, SWOT matrix and QSP matrix. Based on the result of the IFE matrix, Dapur Tahu have ten strengths and two weaknesses, and the EFE matrix resulted in Dapur Tahu having five opportunities and six threats. Based on the results of the IE matrix analysis, it shows that Dapur Tahu is in a position of grow and build. Through SWOT matrix analysis, six alternative strategies were found. The priority strategy is increase online and offline promotional activities. Suggestions for Dapur Tahu are to carry out promotional activities more intensively, provide more supportive service in handling Covid-19, optimize the use of information and communication technology, and add interior decorations.
Keyword: IFE, EFE, IE, SWOT, QSPM

Judul: Analisis Strategi Pemasaran Kedai Kopi Clickbeans di Lentang Agung Jakarta Selatan
Abstrak: Pandemi COVID-19 di Indonesia mengalami kenaikan kasus cukup signifikan pada tahun 2020. Ini membuat beberapa sektor terkena dampaknya mulai dari ekonomi hingga sektor makanan dan minuman. Dampak yang buruk bagi perkembangan usaha serta pendapatan di bidang usaha makanan dan minuman di Indonesia, tidak terkecuali Clickbeans Coffee. Dengan visi pemiliknya melakukan edukasi tentang kopi kepada masyarakat dengan slogan ‘Coffee for Everyone’. Diperlukan strategi agar usaha dapat bertahan dan mempertahankan kualitas yang ada .Oleh karena itu penelitian ini dilakukan untuk menganalisis strategi pemasaran yang tepat untuk Clickbeans Coffee melalui analisis deksriptif dan perumusan yang terdiri dari tahan masukan, pencocokan, dan pengambilan keputusan. Alat yang digunakan adalah matriks IFE, EFE,SWOT, dan QSPM. Hasil analisis matriks menunjukan bahwa Clickbeans Coffee berada pada posisi kuadran IV yakni tumbuh dan berkembang. Berdasarkan hasil analisis matriks SWOT didapatkan tujuh alternatif strategi dengan prioritas strategi meningkatkan promosi dan penjualan baik secara daring (online) maupun luring (offline), The COVID-19 case during pandemic in Indonesia experienced a significant increase in 2020. This has affected several sectors ranging from the economy to the food and beverage sector. The pandemic and the rapid growth of coffee shops have caused a bad impact on business development and income in the food and beverage business sector in Indonesia, and Clickbeans Coffee was no exception. The vision of the owner is to educate the public about coffee with the slogan 'Coffee for Everyone'. A new strategy is needed so that the business can survive and maintainedTherefore, purpose of this research is to analyze the right marketing strategy for Clickbeans Coffee through descriptive analysis and formulation consist of input stage, matching, and decision making. The tools used were IFE, EFE, SWOT, and QSPM matrices. The results of the matrix analysis showed that Clickbeans Coffee was in quadrant IV position: growing and developing. Based on the results of the SWOT matrix analysis, seven alternative strategies were obtained with the priority of strategy was to increase promotion and sales both online and offline.
Keyword: Pandemi, Pemasaran, Kedai Kopi, Covid19, Coffeeshop, E FE, QSPM, SWO T I FE, Marketing Strategy, Pandemic

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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