Judul: Pengaruh E-Service Quality Terhadap Purchase Intention dan Purchase Decision di Shopee Pada Masa Pandemi COVID-19
Abstrak: Perkembangan teknologi informasi sangat pesat dengan adanya internet membuat gaya hidup belanja seseorang berubah. Kondisi pandemi COVID-19 membuat seseorang mengutamakan belanja online karena adanya dampak pembatasan sosial dan fisik. Ditengah persaingan yang ketat diantara e-commerce membuat Shopee harus meningkatkan keunggulan dalam bersaing untuk menarik konsumen. Penelitian ini bertujuan untuk menganalisis pengaruh e-service quality dalam purchase intention dan purchase decision. Metode penarikan sampel yang digunakan adalah non-probability sampling dengan teknik purposive sampling dengan jumlah sampel sebanyak 400 responden. Analisis yang digunakan adalah analisis deskriptif dan stuctural equation model-partial least square. Hasil dari penelitian ini menunjukkan bahwa variabel security/privacy dan variabel website design berpengaruh secara signifikan dan positif terhadap variabel purchase intention dan purchase decision. Sedangkan variabel compensation, fulfillment, dan responsiveness tidak berpengaruh terhadap keduanya. Purchase intention berpengaruh secara signifikan dan positif terhadap purchase decision.
Keyword: e-commerce, e-service quality, purchase decision, purchase intention

Judul: The Influence of E-Service Quality, Product Price, and Customer Trust on Purchasing Decisions of Electronic Products in E-Commerce
Abstrak: Kemajuan teknologi dan ekonomi telah menciptakan e-commerce, memungkinkan pembelian produk elektronik secara online. Namun, ketidakpastian akan kualitas produk dan sifat High Involvement Experience Product meningkatkan kompleksitas keputusan pembelian. Penelitian ini bertujuan menganalisis pengaruh e-service quality, harga produk, dan kepercayaan pelanggan terhadap keputusan pembelian di e-commerce Shopee dan Tokopedia. Penelitian ini dilaksanakan dengan menyebarkan kuesioner secara online melalui Google Forms kepada responden yang berusia 17-44 tahun. Metode analisis data yang digunakan adalah analisis deskriptif dan Structural Equation Modelling dengan model Partial Least Square (SEM-PLS). Hasil penelitian menunjukkan bahwa e-service quality dan harga produk secara parsial berpengaruh signifikan terhadap keputusan pembelian dan kepercayaan pelanggan. Namun, kepercayaan pelanggan tidak berpengaruh terhadap keputusan pembelian. Selain itu, kepercayaan tidak mampu memediasi hubungan antara e-service quality atau harga produk dengan keputusan pembelian., Technological and economic advances had created e-commerce, enabling the purchase of electronic products online. However, uncertainty about product quality and the nature of High Involvement Experiences Products increased the complexity of purchasing decisions. This study aimed to analyze the effect of electronic service quality, product price, and customer trust on purchasing decisions in Shopee and Tokopedia e-commerce. This study is conducted by distributing questionnaires online via Google Forms to respondents aged 17-44 years. The data analysis method used were descriptive analysis and Structural Equation Modeling with the Partial Least Square (SEM-PLS) model. The results showed that electronic service quality and product price partially had a significant effect on purchasing decisions and customer trust. However, customer trust had not influenced purchasing decisions. In addition, trust could not mediate the relationship between electronic service quality or product price and purchasing decisions.
Keyword: Purchase Decision, Customer Trust, Electronic Product, Electronic Service Quality, Product Price

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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