Judul: The Influence of Price, Location, and Service Quality on The Purchase Decision of K-Pop Music Concert Tickets in Jabodetabek
Abstrak: Adanya pandemi Covid-19 yang mulai mereda dan izin yang diberikan oleh pemerintah, mendorong para pebisnis Event Organizer (EO) untuk mengadakan kembali konser musik K-Pop. Penelitian ini bertujuan untuk mengidentifikasi karakteristik pembeli tiket konser musik K-pop di Jabodetabek dan menganalisis pengaruh harga, lokasi, dan kualitas pelayanan terhadap keputusan pembelian tiket konser musik K-Pop di Jabodetabek. Adapun teknik penarikan sampel pada penelitian ini dilakukan menggunakan metode non-probability sampling dengan teknik voluntary sampling. Untuk total responden pada penelitian ini yaitu sebanyak 177 responden yang pernah menonton konser musik K-Pop dan berdomisili di Jabodetabek. Metode analisis data yang digunakan adalah analisis deskriptif dan analisis Structural Equation Modelling-Partial Least Square (SEM-PLS). Hasil penelitian ini menunjukkan bahwa harga memiliki pengaruh yang positif dan signifikan terhadap keputusan pembelian tiket konser musik K-Pop, sedangkan lokasi dan kualitas pelayanan tidak berpengaruh signifikan terhadap keputusan pembelian tiket konser musik K-Pop di Jabodetabek., The presence of the Covid-19 pandemic that had begun to subside and the permission granted by the government, encouraged Event Organizers (EO) to organize K-Pop music concerts once again. This research aimed to identify characteristics of music concert K-pop ticket buyers in Jabodetabek and analyze the influence of price, location, and service quality on the decision to purchase K-Pop concert tickets in Jabodetabek. As for the sampling technique used in this research, it was conducted using the non-probability sampling method with voluntary sampling technique. The total number of respondents in this study was 177 individuals who had attended K-Pop music concerts and domiciled in Jabodetabek. The data analysis method used was descriptive analysis and Structural Equation Modeling-Partial Least Square (SEM-PLS) analysis. The results of this study showed that price had a positive and significant influence on the decision to purchase K-Pop concert tickets, while location and service quality did not have a significant influence on the decision to purchase K-Pop concert tickets in Jabodetabek.
Keyword: event organizer, harga, keputusan pembelian, kualitas pelayanan, lokasi

Judul: Analisis Sikap Konsumen Pada Masa Pandemi Covid-19 dan Pengaruhnya Terhadap Keputusan Pembelian di Coffee Shop Jabodetabek
Abstrak: Pandemi Covid-19 berdampak negatif pada berbagai macam jenis usaha secara langsung termasuk coffee shop yang merupakan tempat orang melakukan interaksi dan berkumpul. Tujuan penelitian adalah untuk menganalisis pengaruh sikap konsumen pada pandemi Covid-19 terhadap keputusan pembelian di coffee shop. Sampel dari penelitian ini adalah masyarakat di Jabodetabek sebanyak 100 orang menggunakan metode non-probability sampling dan teknik purposive sampling. Pengambilan data sampel dilakukan dengan menyebarkan kuesioner ke konsumen yang pernah melakukan kunjungan coffee shop di Jabodetabek . Analisis dilakukan dengan metode Structural Equation Modelling (SEM). Hasil analisis menunjukkan konsumen mengetahui dan meyakini pandemi Covid-19 dan protokol kesehatan. Konsumen juga menerapkan protokol kesehatan Covid-19 dari pemerintah. Sikap konsumen pada masa pandemi ini berpengaruh negatif terhadap keputusan pembelian di coffee shop Jabodetabek
Keyword: Attitudes, Coffee Shop, Covid-19 Pandemic, Purchase Decision, SEM

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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