Judul: Pengaruh Promosi Penjualan dan Pengetahuan terhadap Impulsive Buying pada Konsumen Platform Online
Abstrak: Penelitian ini bertujuan untuk menganalisis hubungan karakteristik konsumen dengan promosi penjualan, pengetahuan, dan impulsive buying serta pengaruh karakteristik konsumen, promosi penjualan, dan pengetahuan, terhadap impulsive buying. Contoh dalam penelitian ini adalah 145 pengguna Shopee yang melakukan pembelian dalam tiga bulan terakhir yang dipilih secara purposive. Data dikumpulkan melalui pengisian kuisioner secara online. Lama pendidikan berhubungan dengan promosi penjualan dan pengetahuan, sedangkan pendapatan dan promosi berhubungan dengan impulsive buying. Faktor yang berpegaruh positif terhadap impulsive buying adalah promosi penjualan.
Keyword: promosi penjualan, pengetahuan, impulsive buying, platform online

Judul: The Influence of Shopping Orientation and  Electronic Word of Mouth on Impulsive Buying
Abstrak: Perkembangan internet memberikan kemudahan bagi para pengguna untuk menunjang kegiatan sehari-hari termasuk belanja online. Penelitian ini bertujuan untuk menganalisis pengaruh karakteristik responden, orientasi belanja dan E-WOM terhadap pembelian impulsif di e-commerce. Penelitian ini menggunakan pendekatan kuantitatif melalui survei online yang melibatkan 269 responden pengguna e-commerce. Hasil uji korelasi menunjukkan bahwa usia dan penghasilan berhubungan positif signifikan dengan pembelian impulsif. Hasil uji pengaruh menunjukkan bahwa kesadaran harga, kecenderungan belanja di rumah, loyalitas terhadap merek/toko, dan E-WOM berpengaruh positif signifikan terhadap pembelian impulsif. Akan tetapi, kesadaran waktu berpengaruh negatif signifikan terhadap pembelian impulsif. Oleh karena itu, konsumen perlu meningkatkan kesadaran terkait kebutuhan produk serta membaca ulasan produk sebagai referensi dari konsumen lain sebelum membeli produk sehingga dapat membuat keputusan berdasarkan kebutuhan dan tidak melakukan pembelian secara impulsif., The development of the internet provides convenience for users to support their daily activities, including online shopping. This study aims to analyze the influence of respondent characteristics, shopping orientation, and electronic word of mouth on impulsive buying in e-commerce. This study uses a quantitative approach through an online survey involving 269 e-commerce users. The correlation test results show that age and income have a significant positive correlation with impulsive buying. Furthermore, awareness of prices, tendency to shop at home, loyalty to brands/stores, and E-WOM have a significant positive influence on impulsive buying. However, awareness of time has a significant negative influence on impulsive buying. Therefore, consumers need to increase their awareness regarding product needs and read product reviews as references from other consumers before making purchases. This will help them make decisions based on their needs and avoid impulsive buying.
Keyword: e-commerce, e-wom, gen z, impulsive buying, shopping orientation

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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