Judul: Factors Influencing Consumer Behavior in the Adoption of Sustainable Consumption of Clothing Products in Jabodetabek
Abstrak: Peningkatan pertumbuhan penduduk yang diiringi dengan peningkatan pendapatan global telah mendorong konsumsi masyarakat terhadap kebutuhan pakaian. Perubahan gaya hidup akan membentuk perilaku konsumtif terhadap produk-produk fashion khususnya pakaian. Jumlah transaksi pembelian produk pakaian di e-commerce didominasi oleh generasi muda Jabodetabek berusia 18-35 tahun. Pola konsumtif di tengah gaya hidup masyarakat dapat membawa dampak buruk bagi lingkungan. Salah satu upaya yang dapat dilakukan masyarakat adalah mendorong perilaku mengonsumsi pakaian menjadi lebih bijak dengan menerapkan Konsumsi Berkelanjutan Produk Pakaian (KBPP). Hingga kini, penelitian mengenai KBPP di Indonesia masih terbatas. Penelitian ini bertujuan untuk menganalisis pola perilaku generasi muda di Jabodetabek, menganalisis persepsinya terhadap KBPP, serta mengidentifikasi faktor-faktor yang memengaruhi mereka untuk menerapkan KBPP. Metode analisis data yang digunakan yaitu analisis deskriptif, skala Thurstone, dan Regresi Logistik Multinomial. Hasil penelitian ini menunjukkan generasi muda cenderung membeli secondhand clothing dengan mayoritas telah menerapkan KBPP. Faktor utama yang memengaruhi penerapan KBPP adalah jenis kelamin, tingkat pendidikan, keterlibatan LSM lingkungan, pengetahuan terhadap KBPP, kepercayaan terhadap KBPP, dan pembelian produk pakaian.
Keyword: generasi muda, pola perilaku, secondhand clothing, sustainable clothing

Judul: Sustainable Apparel Product Purchase Decisions on Indonesian Gen Z and Millennial Women Consumers
Abstrak: Fashion trends continue to change, sustainable and fast fashion brands continue to compete to provide diverse choices for consumers. This study aims to: (1) identify the characteristics of Indonesian Gen Z and millennial women consumers of sustainable apparel products, (2) analyze the influence of sustainable product attributes and marketing factors on sustainable apparel purchasing decisions (3) analyze the influence of individual and social factors on sustainable apparel purchasing decisions using the theory of planned behaviour. The sample in this study was 77 respondents selected by convenience sampling technique. Data analysis was carried out using the SEM-PLS method and descriptive analysis. The results showed that individual factor perceived behavioural control and social factor subjective norms had a positive and significant effect, sustainable product attributes, and marketing factors had a positive but not significant effect, and individual factors attitude had a negative but weak and insignificant effect on purchasing decisions for sustainable apparel products., Tren feysen terus berganti, brand sustainable dan fast fashion terus bersaing untuk memberikan pilihan yang beragam bagi konsumen. Penelitian ini bertujuan untuk: (1) mengidentifikasi karakteristik konsumen wanita produk pakaian berkelanjutan gen Z dan milenial Indonesia, (2) menganalisis pengaruh atribut dan pemasaran produk berkelanjutan terhadap keputusan pembelian pakaian berkelanjutan, dan (3) menganalisis pengaruh faktor individu dan sosial terhadap keputusan pembelian pakaian berkelanjutan menggunakan variabel theory of planned behavior. Sampel pada penelitian ini berjumlah 77 responden yang dipilih dengan teknik convenience sampling. Analisis data dilakukan menggunakan metode SEM-PLS dan analisis deskriptif. Hasil penelitian menunjukkan bahwa faktor individu pengendalian perilaku dan faktor sosial norma subjektif berpengaruh positif dan signifikan, faktor atribut dan pemasaran produk berkelanjutan berpengaruh positif namun tidak signifikan dan faktor individu sikap berpengaruh negatif namun lemah dan tidak signifikan terhadap pengambilan keputusan pembelian produk pakaian berkelanjutan.
Keyword: product attributes and marketing, purchase decision, SEM-PLS, sustainable apparel product, theory of planned behavior

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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