Judul: Marketing Strategy of PT TaniHub Indonesia after the Covid-19 Pandemic
Abstrak: The COVID-19 pandemic has had a negative impact on various types of businesses, one of which is e-commerce in the agricultural sector. PT. TaniHub Indonesia is one of the e-commerce in the agricultural sector that has been affected by the COVID-19 pandemic. The purpose of this research is to analyze and identify internal and external factors that influence PT TaniHub Indonesia, so that it can formulate alternative and priority marketing strategies that can be applied by PT Tani Hub Indonesia. The analytical methods used in this research are matriks IFE, matriks EFE, matriks IE dan AHP. Based on the research results, the IFE matrix (3,180), the EFE matrix (3,308), the position of the IE matrix is in cell I with the grow and build strategy. An alternative marketing strategy that is a priority for PT TaniHub Indonesia is to increase effective and efficient promotional activities (0.297).
Keyword: Agriculture, AHP, Marketing, Pandemic, SWOT

Judul: Innovative Marketing Strategy of PT Karya Anak Langgeng Persada during COVID-19 Pandemic
Abstrak: Pandemi COVID-19 memberikan berbagai dampak negatif bagi berbagai pelaku usaha di Indonesia termasuk UMKM. PT Karya Anak Langgeng Persada “Telap Telep” merupakan salah satu usaha menengah terdampak yang mengalami penurunan jumlah kegiatan operasional. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis faktor internal dan faktor eksternal yang mempengaruhi Telap Telep, sehingga dapat merumuskan alternatif dan prioritas strategi pemasaran yang dapat diterapkan oleh PT Karya Anak Langgeng Persada. Penelitian ini menggunakan metode analisis deskriptif dan analisis perumusan tiga tahap yang terdiri dari tahap masukan, tahap pencocokan, dan tahap pengambilan keputusan. Alat analisis yang digunakan pada penelitian ini adalah matriks IFE, Matriks EFE, Matriks SWOT dan Matriks QSP. Hasil analisis matriks IFE menghasilkan Telap Telep memiliki tujuh kekuatan dan empat kelemahan, dan pada matriks EFE menghasilkan Telap Telep memiliki tiga peluang dan empat ancaman yang dihadapi. Terdapat tujuh alternatif strategi yang dihasilkan dengan matriks SWOT dengan prioritas strategi yaitu mengoptimalkan promosi melalui sosial media.
Keyword: inovatif, pandemi, pemasaran, innovative, marketing, 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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