Judul: The Effect of Online Consumer Review and Rating  on Purchase Intention of Health Products on Shopee E-Marketplace During the  Covid-19 Pandemic in Jabodetabek
Abstrak: Pandemi COVID-19 menyebabkan peningkatan pembelian produk-produk kesehatan seperti masker, handsanitizer, obat-obatan dan lain-lain. Shopee merupakan salah satu e-marketplace yang sedang berkembang di Indonesia dan menyediakan fitur online consumer review dan rating pada platformnya. Penelitian ini bertujuan untuk menganalisis pengaruh online consumer review dan rating terhadap minat beli produk kesehatan pada e-marketplace Shopee selama masa pandemi COVID-19 di Jabodetabek. Penarikan sampel dilakukan dengan teknik purposive sampling. Metode yang digunakan dalam penelitian ini adalah analisis deskriptif dan SEM-PLS. Hasil analisis menunjukkan variabel online consumer review dan rating berpengaruh positif dan signifikan terhadap minat beli produk kesehatan dengan variabel rating memiliki pengaruh lebih dominan., COVID-19 pandemic led to an increase in purchases of health products such as masks, handsanitizers, medicines and others. Shopee is one of the growing online marketplaces in Indonesia that provides online consumer review and rating features on its. This study aimed to analyze the effect of online consumer review and rating on purchase intention of health products on shopee online marketplace during the COVID-19 pandemic. The sampling method used in this study was purposive sampling technique. The method used in this research was descriptive analysis and SEM-PLS. The results of the analysis show that online consumer review and rating variables have a positive and significant effect on purchase intention in health products with the rating variable as the dominant influence.
Keyword: Health Products, Online Consumer Review, Purchase Intention, Rating, Shopee

Judul: Pengaruh Online Consumer Review dan Rating  terhadap Purchase Intention Produk Serum Somethinc pada Marketplace Shopee di Jabodetabek
Abstrak: Peningkatan jumlah pengguna internet menciptakan banyak peluang bagi para pengusaha, sehingga mengakibatkan peningkatan jumlah e-commerce dan marketplace di Indonesia. Shopee adalah salah satu marketplace Indonesia yang menawarkan fitur online consumer review dan rating di platform. Tujuan penelitian ini menganalisis pengaruh online consumer review dan rating terhadap purchase intention produk serum Somethinc pada marketplace Shopee. Jenis penelitian ini adalah penelitian kuantitatif dengan teknik pengambilan sampel purposive sampling. Data penelitian dikumpulkan pada bulan April – Mei 2023 melalui kuesioner dari 150 responden di Jabodetabek sebagai data primer dan melalui studi literatur dari buku, jurnal, dan artikel terkait sebagai data sekunder. Penelitian ini menggunakan metode analisis deskriptif dan Structural Equation Modeling-Partial Least Square (SEM-PLS). Hasil penelitian menunjukkan variabel online consumer review dan rating berpengaruh signifikan dan positif terhadap purchase intention produk serum Somethinc dengan variabel rating memiliki pengaruh lebih dominan., The increase in the number of internet users creates many opportunities for entrepreneurs, resulting in an increase in the number of e-commerce sites and marketplaces in Indonesia. Shopee is one of the Indonesian marketplaces that offers online consumer review and rating features on its platform. The purpose of this study was to analyze the effect of online consumer review and rating on purchase intention of Somethinc serum products on Shopee marketplace. This type of research is quantitative research with purposive sampling technique. The research data was collected in April - May 2023 through questionnaires from 150 respondents in Jabodetabek as primary data and through literature studies from books, journals, and related articles as secondary data. This research uses the descriptive analysis method and Structural Equation Modeling-Partial Least Square (SEM-PLS). The results showed that the online consumer review and rating variables had a significant and positive effect on the purchase intention of Somethinc serum products with the rating variable having a more dominant influence.
Keyword: online consumer review, purchase intention, rating, Shopee, Somethinc  serum

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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