Judul: Factors Affecting Compulsive Buying Behavior in Online Shopping Post COVID-19 Pandemic
Abstrak: COVID-19 telah menciptakan krisis kesehatan global yang berdampak mendalam pada cara masyarakat dalam memandang dunia dan kehidupan sehari- hari. Krisis kesehatan seperti COVID-19, dapat menjadi pemicu utama masyarakat untuk melakukan compulsive buying. Penelitian ini bertujuan untuk menganalisis perubahan karakteristik masyarakat di Jakarta, menganalisis pengaruh media exposure, personality factors, dan external offerings terhadap compulsive buying pada online shopping pasca pandemi COVID-19 di Jakarta. Total responden yang diperoleh adalah 220 orang. Data yang digunakan dalam penelitian ini adalah data primer dan data sekunder. Penelitian ini menggunakan metode analisis deskriptif, uji chi-square, dan SEM-PLS. Hasil dari penelitian ini adalah personality factors memengaruhi compulsive buying melalui materialism dan arousal. Media exposure tidak berpengaruh signifikan dengan compulsive buying, tetapi media exposure berpengaruh positif signifikan dengan response towards COVID-19 dan response towards COVID-19 berpengaruh positif signifikan dengan compulsive buying. Variabel external offerings tidak berpengaruh signifikan dengan compulsive buying pada online shopping pasca pandemi COVID-19 di Jakarta., COVID-19 has created a global health crisis that has a profound impact on the way people view the world and their daily lives. A health crisis such as COVID- 19, can be a major trigger for people to do a compulsive buying. This study aims to analyze changes in the characteristics of people in Jakarta, to analyze the influence of media exposure, personality factors, and external offerings on compulsive buying in online shopping after the COVID-19 pandemic in Jakarta. Total respondents obtained were 220 people. The data used in this study are primary data and secondary data. This research uses descriptive analysis method, chi-square and SEM-PLS. The result of this study is that personality factors affect compulsive buying through materialism and arousal. Media exposure does not have significant affect directly compulsive buying, but media exposure has a significant effect on the response towards COVID-19 and response towards COVID-19 has a significant effect on compulsive buying. The external offerings variable did not affect compulsive buying on online shopping after the COVID-19 pandemic in Jakarta.
Keyword: Compulsive Buying, External Offerings, Media Exposure, Personality Factors

Judul: Faktor yang Memengaruhi Impulse Buying Behavior Selama Masa Pandemi Covid-19 pada Pengguna E-Commerce Tokopedia
Abstrak: Pandemi Covid-19 memberikan dampak serius terhadap berbagai sektor secara global, khususnya sektor perekonomian. Kondisi saat ini memicu ketakutan, kepanikan dan ketidakpastian sehingga semua orang harus menyesuaikan diri dengan cepat terhadap perubahan. Tokopedia merupakan salah satu e-commerce yang mengalami peningkatan jumlah pengunjung selama pandemi Covid-19. Popularitas mobile shopping membuat perilaku berbelanja tidak lagi dibatasi oleh ruang dan waktu, sehingga pembelian impulsif lebih umum terlihat pada masa ini. Penelitian ini bertujuan menganalisis faktor yang memengaruhi impulse Buying Behavior pada masa pandemi Covid-19. Metode pengambilan sampel menggunakan metode purposive sampling dengan teknik non-probability sampling. Penelitian ini menggunakan Structural Equation Model (SEM) melalui pendekatan Partial Least Square (PLS) dalam pengolahan data. Hasil penelitian menunjukkan bahwa faktor social media fake news dan perceived enjoyment berpengaruh positif dan signifikan terhadap impulse buying pada masa pandemi Covid-19 dengan T-statistic sebesar 4,841 pada faktor perceived enjoyment. Hal ini menandakan bahwa berita fake untuk strategi pemasaran dapat meningkatkan impulse buying dan pelayanan dan kemudahan dalam bertransaksi dapat memberikan kenyamanan kepada konsumen sehinggga dapat meningkatkan impulse buying.
Keyword: Covid-19, E-commerce, Impulse Buying, SEM-PLS, Tokopedia

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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