Judul: The Effect of Brand Equity and Brand Loyalty of Cat Feed on Consumer Purchasing Decisions in Jabodetabek
Abstrak: Indonesia merupakan negara dengan tingkat kepemilikan kucing sebagai hewan peliharaan terbanyak di Asia. Namun, pangsa pasar makanan kucing di Indonesia dikuasai oleh merek produk makanan kucing impor. Sementara, merek produk makanan kucing lokal cenderung memiliki kedudukan yang relatif menurun dalam pangsa pasar makanan kucing di Indonesia. Adanya perbedaan persepsi dan preferensi konsumen terhadap merek makanan kucing tersebut mendorong dilakukannya penelitian ini. Tujuan penelitian ini adalah untuk menganalisis pengaruh ekuitas merek dan loyalitas merek makanan kucing terhadap keputusan pembelian konsumen di wilayah Jakarta, Bogor, Depok, Tangerang, dan Bekasi (Jabodetabek). Wilayah Jabodetabek dipilih secara sengaja dengan pertimbangan wilayah tersebut merupakan salah satu wilayah terpadat penduduknya di Indonesia. Penelitian ini menggunakan alat analisis SEM-PLS dengan bantuan software smartPLS 3.0 untuk menganalisis pengaruh langsung ekuitas merek dan loyalitas merek pakan kucing terhadap keputusan pembelian konsumen. Hasil penelitian menunjukkan bahwa ekuitas merek dan loyalitas merek memengaruhi keputusan pembelian., Indonesia has the highest rate of cat ownership as a pet in Asia. However, the cat food market share in Indonesia is dominated by imported cat food brands. Meanwhile, local cat food brands tend to have a relatively declining position in the market share of cat food in Indonesia. The differences in consumer perceptions and preferences for imported and local cat food brands prompted this study. The purpose of this study was to examine the effect of cat food brand equity and brand loyalty on consumer purchasing decisions in the Jakarta, Bogor, Depok, Tangerang, and Bekasi (Jabodetabek) areas. The Jabodetabek area was purposely selected with the consideration that the area is one of the most populous areas in Indonesia. This study uses the SEM-PLS analysis tool with the help of smartPLS 3.0 software to determine the direct effect of cat food brand equity and brand loyalty on consumer purchasing decisions. The results showed that brand equity and brand loyalty influence purchasing decisions.
Keyword: brand equity, brand loyalty, cat food, consumer, purchasing decisions

Judul: Consumer Patterns and Perceptions of Purchase Decisions and Consumer Loyalty in Milk Products in Jabodetabek
Abstrak: Produk minuman susu sudah banyak beredar di masyarakat dengan berbagai variasi, sehingga perlu memahami konsumen serta faktor yang mempengaruhi minat konsumen dalam melakukan pembelian, melalui atribut produknya. Penelitian ini bertujuan mengetahui pola konsumsi, persepsi konsumen dan loyalitas konsumen masyarakat terhadap produk minuman susu di wilayah Jabodetabek. Penelitian dilakukan dengan survei online yang terdiri dari tahapan yaitu studi literatur, penentuan metode pengambilan data, penentuan responden, penyusunan kuesioner, pengujian kuesioner, pengumpulan data, pengolahan data, dan pelaporan. Analisis data dilakukan dengan uji deskriptif, crosstab, Chi-square, dan uji Net Promoter Score dengan menggunakan software Microsoft Excel dan SPSS 25. Responden memiliki pola konsumsi tertinggi dengan frekuensi konsumsi sebanyak 1-2 kali seminggu pada jenis susu UHT berkemasan tetra pak pada brand Ultramilk. Pertimbangan keputusan pembelian dilihat dari faktor rasa, sertifikasi, dan kandungan gizi dengan memperhatikan kandungan protein, mineral, gula, vitamin, dan lemak. Beberapa dari profil responden seperti domisili, usia, jenis kelamin, pendidikan, pekerjaan, pendapat, dan pengeluaran memiliki hubungan yang signifikan terhadap beberapa atribut pola dan persepsi konsumen. Terdapat 5 dari 16 brand yang memiliki konsumen puas dan loyal karena memiliki Net Promoter Score yang bernilai positif., Milk products have circulated a lot in public with various variations, so it is necessary to understand consumers and the factors that influence consumer interest in making purchases, through product attributes. This study aims to determine consumption patterns, consumer perceptions and consumer loyalty to milk products in the Jabodetabek. The research was conducted using an online survey consisting of stages: literature study, determining data collection methods, determining respondents, preparing questionnaires, testing questionnaires, data collection, data processing, and reporting. Data analysis was carried out by descriptive, crosstab, Chi-square, and Net Promoter Score tests using Microsoft Excel and SPSS 25 software. Respondents had the highest consumption pattern with a consumption frequency of 1-2 times a week on UHT milk in tetra pak packaging for Ultramilk brands. Consideration of purchasing decisions is seen from the taste, certification, and nutritional content by paying attention to the content of protein, minerals, sugar, vitamins, and fat. Some of the respondents profiles such as domicile, age, gender, education, occupation, income, and expenditure have a significant relationship to some attributes of consumer patterns and perceptions. There are 5 out of 16 brands that have satisfied and loyal consumers because they have a positive Net Promoter Score.
Keyword: Consumer, Loyalty, Milk, Pattern, Perspective

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: