Judul: Analisis Pengaruh Green Altruism dan Green Perceived Value terhadap Purchase Intention Produk AVOSKIN di Jabodetabek
Abstrak: Peningkatan kesadaran lingkungan berdampak pada perubahan pola konsumsi masyarakat terhadap produk skincare sebesar 39%. Konsumen yang mulai peduli lingkungan akan menerapkan konsep konsumsi yang bertanggung jawab dengan cara selektif dalam memilih skincare yang digunakan. AVOSKIN merupakan brand skincare lokal asal Indonesia yang mengusung konsep green beauty sebagai keunggulan kompetitifnya. Penelitian ini bertujuan menganalisis pengaruh green altruism dan green perceived value terhadap purchase intention produk AVOSKIN di Jabodetabek. Penelitian dilakukan pada bulan Mei sampai Juni 2023. Data yang digunakan terdiri dari data primer berupa kuesioner dan data sekunder berupa studi literatur. Jumlah responden dalam penelitian ini sebanyak 228 responden dengan teknik penarikan sampel non-probability sampling dan metode purposive sampling. Metode analisis data dalam penelitian ini menggunakan analisis deskriptif untuk mengidentifikasi karakteristik konsumen serta analisis SEM-PLS melalui tipe second order construct dengan metode embedded two-stage approach. Hasil penelitian menunjukkan bahwa green perceived value berpengaruh signifikan dan positif terhadap purchase intention, sedangkan green altruism tidak berpengaruh signifikan terhadap purchase intention. Green attitude mampu memediasi pengaruh green altruism dan green perceived value terhadap purchase intention.
Keyword: AVOSKIN, green altruism, green perceived value, green attitude, purchase intention

Judul: Analysis of Green Purchase Intention in Organic Cosmetics using the Theory of Planned Behavior Approach
Abstrak: Persaingan bisnis semakin tinggi membuat perusahaan harus meningkatkan daya saing dari kompetitor dimana tidak fokus ke profit tetapi juga planet dan people contohnya dengan produksi green product. Tingginya pertumbuhan dan pendapatan industri kosmetik per tahun serta semakin banyaknya merek kosmetik organik yang beredar sehingga penting untuk mengetahui faktor dominan dari Theory of Planned Behavior yang mempengaruhi green purchase intention serta pengaruh attitude, subjective norm dan perceived behavior control terhadap green purchase intention. Metode penelitian ini adalah kuantitatif deskriptif dengan pengumpulan data menggunakan kuesioner yang disebarkan kepada 200 orang Jabodetabek berusia minimal 18 tahun, serta menggunakan kosmetik organik. Adapun analisis data penelitian ini adalah deskriptif dan SEM PLS menggunakan aplikasi Smartpls 3.0 dan Excel. Hasil yang diperoleh menunjukan bahwa attitude, subjective norm dan perceived behavior control berpengaruh positif signifikan terhadap green purchase intention dan subjective norm merupakan faktor dominan yang mempengaruhi green purchase intention., Business competition is increasingly high that companies must increase their competitiveness from competitors by implementing green products. The high growth and income of the cosmetics industry per year and the increasing number of organic cosmetic brands in circulation make it important to focus on profit but also the planet and people, for example by producing green products. The high growth and income of the cosmetics industry per year and the increasing number of organic cosmetic brands in circulation make it important to know the dominant factors from the Theory of Planned Behavior that influence green purchase intention and the influence of attitude, subjective norms and perceived behavior control on green purchase intention. This research method was descriptive quantitative with data collection used a questionnaire distributed to 200 Jabodetabek people aged at least 18 years, and who used organic cosmetics. The data analysis used SEM PLS and descriptive used the Smartpls 3.0 and Excel applications. The results obtained show that attitude, subjective norms and perceived behavior control had a significant positive effect on green purchase intention and subjective norm was dominant factor influenced green purchase intention
Keyword: Theory of Planned Behavior, green purchase intention, kosmetik organik

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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