Judul: Factors Influencing Generation Z's Impulse Buying Behavior During the Covid- 19 Pandemic in Shopee E-Commerce
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. Hal ini membuat keinginan untuk berbelanja secara online meningkat. Salah satunya melalui e-commerce shopee. 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 untuk membahas faktor yang memengaruhi impulse Buying Behavior pada generasi Z selama pandemi Covid-19. Metode pengambilan sampel yang digunakan adalah 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 variabel perceived uncertainty berpengaruh positif dan signifikan terhadap impulse buying selama pandemi Covid-19. Kata
Keyword: COVID-19, e-commerce, impulse buying, SEM-PLS, Shopee, COVID-19, e-commerce, impulse buying, SEM-PLS, Shopee

Judul: Factor That Influence Impulse Buying in Generation Z (Shopee E-commerce Users)
Abstrak: Teknologi internet semakin berkembang pesat di seluruh dunia termasuk Indonesia. Dengan bertambahnya jumlah penduduk maka jumlah pengguna internet juga ikut meningkat. Saat ini masyarakat memiliki tren untuk melakukan belanja online akibat dari pesatnya perkembangan e-commerce di Indonesia. Konsumen yang melakukan pembelian produk yang dilakukan secara online sebagian besar mengalami impulse buying atau pembelian yang tidak direncanakan. Tujuan penelitian ini yaitu untuk menganalisis karakteristik konsumen dan faktor apa saja yang memengaruhi terjadinya impulse buying pada generasi Z pengguna e-commerce Shopee. Penelitian ini menggunakan data primer dan data sekunder. Data primer berasal dari kuisioner yang diisi oleh responden yang merupakan generasi Z pengguna e-commerce Shopee. Metode yang digunakan yaitu metode analisis deskriptif dan analisis model persamaan struktural dengan pendekatan partial least square (SEM-PLS). Hasil penelitian menunjukkan faktor emotion, hedonic shopping, dan time available memiliki pengaruh positif dan signifikan terhadap perilaku impulse buying generasi Z dengan faktor dominan yaitu faktor hedonic shopping yang memiliki nilai t statistik sebesar 3,629., Internet technology is overgrowing throughout the world, including in Indonesia. The number of internet users has also increased with the increase in population. Currently, people have a trend to do online shopping due to the rapid development of e-commerce in Indonesia. Consumers who make product purchases made online mainly experience impulse buying or unplanned purchases. The purpose of this study is to analyze the characteristics of consumers and what factors influence the occurrence of impulse buying in Generation Z of Shopee e-commerce users. This study uses primary data and secondary data. Primary data comes from questionnaires filled out by respondents who are Generation Z users of Shopee e-commerce. The method used is the descriptive analysis method and structural equation model analysis with a partial least squares approach (SEM-PLS). The results showed that emotion, hedonic shopping, and time available factors had a positive and significant influence on the impulse buying behaviour of Generation Z. The dominant factor was the hedonic shopping factor, which had a t-statistical value of 3,629.
Keyword: e-commerce, impulse buying, generation Z, Shopee

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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