Judul: The Effect of Brand Image, Product Quality, Price and Promotion towards Consumer Purchase Intention of Somethinc Products in Jabodetabek
Abstrak: Industri kecantikan merupakan salah satu sektor bisnis dengan peningkatan yang pesat setiap tahunnya, sehingga menyebabkan munculnya banyak pelaku usaha baru di bidang tersebut. Akibat kesadaran yang meningkat tentang pentingnya menjaga kesehatan kulit, produk perawatan kulit telah menjadi salah satu barang yang dimiliki setiap orang. Tujuan dari penelitian ini adalah untuk mengidentifikasi karakteristik responden dan mengetahui bagaimana citra merek, kualitas produk, harga, dan promosi berdampak pada minat beli konsumen Somethinc. Selain itu, penelitian ini juga akan menganalisis faktor-faktor yang paling berpengaruh pada minat beli konsumen Somethinc di Jabodetabek. Metode Analisis deskriptif dan SEM-PLS digunakan untuk menganalisis data. Teknik pengambilan sampel yang diterapkan adalah voluntary sampling. Hasil penelitian menggambarkan bahwa faktor harga dan promosi memiliki pengaruh positif dan signifikan terhadap minat beli. Lebih lanjut, variabel promosi tampaknya memiliki pengaruh yang paling dominan terhadap minat beli.
Keyword: Brand Image, Product Quality, Price, Promotion, Purchase Intention

Judul: The Effect of Virtual Try-On Features and Brand Image on Purchase Decisions of Cosmetic Products on  E-Commerce by Female Consumers in Jabodetabek
Abstrak: Peningkatan penggunaan internet di Indonesia mendorong konsumen untuk membeli kosmetik secara online melalui e-commerce. Perkembangan industri e-commerce memberikan peluang bagi usaha kosmetik untuk mengoptimalkan strategi pemasaran inovatif. Namun, persepsi negatif mengenai ketidaksesuaian produk antara gambar dan kondisi asli sering menghambat konsumen dalam mengambil keputusan pembelian di e-commerce sehingga diperlukan strategi pemasaran seperti penggunaan fitur virtual try-on dan penguatan brand image. Penelitian ini bertujuan untuk menganalisis pengaruh antara fitur virtual try-on dan brand image terhadap keputusan pembelian produk kosmetik pada e-commerce di Jabodetabek. Penelitian dilakukan pada bulan Maret 2024 hingga Mei 2024. Penelitian ini menggunakan data primer dan data sekunder yang dianalisis menggunakan analisis deskriptif dan analisis SEM-PLS dengan sampel sebanyak 195 responden. Metode penarikan sampel menggunakan teknik purposive sampling. Hasil penelitian menunjukkan bahwa virtual try-on dan brand image berpengaruh positif dan signifikan terhadap keputusan pembelian., The increased use of the internet in indonesia encourages consumers to purchase cosmetics online through e-commerce. The development of the e-commerce industry provides opportunities for cosmetic businesses to optimize innovative marketing strategies. However, negative perceptions about the discrepancies between product images and actual conditions often hinder consumer’s purchasing decisions on e-commerce, requiring marketing strategies like virtual try-on features and brand image enhancement. This research aim to analyze the effect of virtual try-on features and brand image on the purchasing decision of cosmetic products on e-commerce in Jabodetabek. The study was conducted from March 2024 to May 2024. The data used in this study are primary data and secondary data which were analyzed using descriptive analysis and SEM-PLS with a sample of 195 respondents. The sampling method used purposive sampling technique. The result show that virtual try-on and brand image both positively and significantly impact purchasing decision.
Keyword: brand image, e-commerce, keputusan pembelian, virtual try-on

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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