Judul: The Effect of Service Quality on Customer Loyalty through Customer Satisfaction of Ecotainment Service Product at Godongijo Asri
Abstrak: Bagi perusahaan, membangun loyalitas konsumen merupakan hal yang sangat penting. Objek dari penelitian ini adalah agrowisata Ecotainment Godongijo Asri. Kepuasan konsumen terhadap kualitas layanan dapat menciptakan loyalitas, sehingga penelitian ini bertujuan untuk: (1) menganalisis faktor-faktor kualitas layanan dan harga yang memengaruhi kepuasan konsumen produk layanan Ecotainment dari Godongijo Asri; dan (2) menganalisis pengaruh tingkat kepuasan konsumen terhadap tingkat loyalitas konsumen produk layanan Ecotainment Godongijo Asri. Sampel pengunjung yang menjadi responden dalam penelitian ini adalah 40 orang pengunjung. Analisis data yang digunakan adalah analisis deskriptif, analisis Customer Satisfaction Index (CSI) dan Customer Loyalty Index (CLI), serta analisis Structural Equation Modelling-Partial Least Squares (SEM-PLS). Hasil penelitian ini menunjukkan bahwa: 1) terdapat pengaruh signifikan kepuasan konsumen terhadap loyalitas konsumen; 2) dari semua indikator Kualitas Pelayanan (penampakan, keandalan, daya tanggap, jaminan, dan empati), hanya dimensi empati yang berpengaruh positif dan signifikan terhadap Kepuasan Konsumen; 3) indikator harga tidak berpengaruh secara signifikan terhadap kepuasan konsumen; 4) berdasarkan hasil CSI, tingkat kepuasan konsumen produk layanan ecotainment Godongijo Asri adalah sangat puas; (5) berdasarkan hasil CLI, tingkat loyalitas konsumen produk layanan ecotainment Godongijo Asri adalah sangat loyal., For companies, building customer loyalty is very important. The object of this research is ecotainment agrotourism of Godongijo Asri. Consumer satisfaction on service quality can create loyalty, that being said, this research aims to: (1) analyze the factors of service quality and price that effect consumer satisfaction of Godongijo Asri’s ecotainment service products; (2) analyze the effect of consumer satisfaction level on consumer loyalty level of Godongijo Asri’s ecotainment service products. The sample of the consumers who became respondents in this research were 40 consumers. The data analysis used were descriptive analysis, Customer Satisfaction Index (CSI) analysis and Customer Loyalty Index analysis, and also Structural Equation Modelling-Partial Least Squares (SEM-PLS) analysis. The results of this research indicate that: 1) there is a significant effect of consumer satisfaction on consumer loyalty; 2) from all of dimensions of Service Quality (tangibles, reliability, responsiveness, assurance, and empathy), only emphaty dimension has a significant effect on consumer satisfaction; 3) indicator price have no significant effect on consumer satisfaction; 4) based on CSI value, the consumer satisfaction level of Godongijo Asri’s ecotainment service product is very satisfied; 5) based on CLI value, the consumer loyalty level of Godongijo Asri’s ecotainment service product is very loyal.
Keyword: Ecotainment, Loyalty, Satisfaction, Service quality, Kepuasan, Loyalitas, Kualitas layanan

Judul: The Effect of E-Service Quality on GrabFood's Customers' Satisfaction and Loyalty
Abstrak: Online food delivery merupakan salah satu bentuk implementasi teknologi yang telah melekat pada aktivitas sehari-hari masyarakat. Di Indonesia, salah satu layanan online food delivery yang sudah tersedia adalah GrabFood. Namun, dengan persaingan yang kompetitif, GrabFood harus bisa terus menjaga dan meningkatkan e-service quality yang dimiliki agar dapat menjaga kepuasan dan loyalitas konsumennya. Penelitian ini dilakukan terhadap responden sebanyak 139 orang yang dipilih dengan menggunakan teknik non-probabilty sampling yaitu purposive sampling. Teknik yang digunakan dalam analisis data adalah SEM-PLS untuk melihat hubungan antar variabel dan analisis deskriptif untuk menjelaskan karakteristik responden. Dari hasil penelitian ditemukan bahwa e-service quality berpengaruh secara positif dan signifikan terhadap kepuasan dan loyalitas pelanggan. Selain itu, kepuasan pelanggan berpengaruh secara positif dan signifikan terhadap loyalitas pelanggan. Serta, kepuasan pelanggan dapat memediasi pengaruh e-service quality terhadap loyalitas pelanggan dengan bentuk mediasi yaitu mediasi parsial. GrabFood perlu terus untuk memperhatikan dan memelihara e-service quality yang dimiliki, terutama pada dimensi efisiensi, agar dapat mempertahankan dan meningkatkan kepuasan dan loyalitas pelanggannya., Online food delivery is a form of technology application that is implanted in people's daily activities. In Indonesia, one of the available online food delivery services is GrabFood. However, with fierce competition, GrabFood must be able to continue to maintain and improve the quality of its e-services in order to maintain customer satisfaction and loyalty. This research was conducted on 139 respondents who were selected using a non-probability sampling technique, specifically purposive sampling. The technique used in data analysis is SEM-PLS to see the relationship between variables and descriptive to explain the characteristics of the respondents. From the results of the study it was found that e-service quality has a positive and significant effect on customer satisfaction and loyalty. In addition, customer satisfaction has a positive and significant effect on customer loyalty. Also, customer satisfaction can mediate the effect of e-service quality on customer loyalty in a form of mediation, namely partial mediation. GrabFood needs to continue to pay attention to and maintain it’s e-service quality, especially in the efficiency aspect, in order to maintain and increase it’s customer’s satisfaction and loyalty.
Keyword: customer loyalty, customer satisfaction, e-service quality, grabfood

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.
Keyword: