Judul: The Application of Planned Behavior Theory On Millennial Generation Behavior In Purchasing Organic Vegetables
Abstrak: Sayur organik merupakan sayuran yang dihasilkan secara alami melalui standar proses produksi organik, yang dihasilkan tanpa menggunakan pupuk sintetis, pertisida dan bahan kimia lainnya. Tujuan penelitian ini adalah untuk memahami perilaku pembelian sayur organik pada generasi milenial di Kota Bandung dengan pendekatan Theory of Planned Behavior (TPB). Teori ini dimaksudkan untuk menjelaskan semua perilaku dimana seseorang memiliki kemampuan untuk melakukan pengendalian diri. Penelitian ini juga mencoba untuk memperluas TPB dengan menambahkan satu variabel tambahan yaitu kesadaran pada kesehatan (health consciousness) dalam kerangka penilitian. Metode yang digunakan dalam penelitian ini adalah Analisis Deskriptif, Confirmatory Factor Analysis (CFA) dan Structural Equation Modeling (SEM) dengan pendekatan AMOS, jumlah sampel yang digunakan sebanyak 208 responden. Responden Generasi Milenial terdiri dari rentang usia 21-40 tahun kuesioner ditentukan berdasarkan metode Non-Probability Sampling, sedangkan cara pengambilan sampel yang digunakan adalah Quota Sampling. Pengumpulan data dilakukan dengan cara meyebarkan kuesioner secara online menggunakan Google Form yang disebarkan melalui WhatsApp dan Instagram. Hasil penelitian menunjukkan bahwa responden menganggap sayur organik lebih aman untuk dikonsumsi karena tidak mengandung residu pestisida dan bahan kimia sehingga baik untuk kesehatan. Responden juga mengatakan dirinya merasa lebih sehat setelah mengkonsumsi sayuran organik, tetapi akan lebih sehat lagi apabila diiringi dengan pola hidup sehat. Dari segi harga responden mengatakan tidak keberatan dengan harga yang ditawarkan karena sesuatu yang lebih baik manfaatnya tentu akan lebih tinggi pula nilainya. Berdasarkan hasil olahan SEM menggunakan AMOS dapat diketahui bahwa variabel purchase intention memiliki pengaruh yang paling dominan terhadap purchase behavior, hal ini ditunjukkan oleh nilai koefisien jalurnya sebesar 0,984 merupakan yang terbesar dibandingkan dengan koefisien jalur dari variabel yang lain. Sedangkan health consciousness merupakan penambahan variabel dari modifikasi Theory of Planned Behavior memiliki pengaruh paling dominan terhadap perceived behavioral control, hal ini ditunjukkan oleh nilai koefisien jalurnya sebesar 0,488., Organic vegetables are processed or produced naturally through standard organic production processes, which doesn’t use synthetic fertilizers, perticides, and other chemicals. The purpose of this study was to understand the buying behavior of organic vegetables in millennial generation in the city of Bandung with the Theory of Planned Behavior approach. This theory is intended to explain all behaviors where a person has the ability to exercise self-control. This study also tries to broaden the Theory of Planned Behavior (TPB) by adding one additional variable, namely health awareness, in the framework of the study. The method used in this research is Descriptive Analysis, Confirmatory Factor Analysis (CFA) and Structural Equation Modeling (SEM) with AMOS approach, the numbers of samples used was 208 respondents. Millenial generation respondents consisted of an age range of 21-40 years, the questionnaire was determined based on the non-probability sampling method used was quota sampling. Data collection was carried out by distributing questionnaires online using Google Form which were distributed via WhatsApp and Instagram. The results showed that respondents considered organic vegetables safer for consumption, since they did not contain pesticide residues and chemicals that were harmful for health. Respondents also said that they felt healthier after consuming organic vegetables, but consuming organic product would be healthier if accompanied by a healthy lifestyle. In terms of price, respondents said
Keyword: Health Consciousness, Millennial Generation, Organic Vegetables, Structural Equation Modeling, Theory of Planned Behavior

Judul: Young Generation’s Willingness to Pay for Organic Vegetables and Factors Affecting It in Bogor and Tasikmalaya
Abstrak: Generasi muda menjadi generasi yang memiliki awareness terhadap lingkungan dan kesehatan. Generasi ini cenderung memilih makanan yang bersih, organik, dan alami. Sayuran organik merupakan produk dengan tingkat konsumsi tertinggi diantara produk pertanian organik lainnya. Sayuran organik umumnya memiliki harga lebih mahal, namun dapat memberikan manfaat lebih bagi kesehatan dibandingkan non organik. Tujuan penelitian yaitu (1) mengidentifikasi persepsi generasi muda terhadap sayuran organik dibandingkan sayuran non organik, (2) mengestimasi nilai willingness to pay (WTP) sayuran organik, dan (3) menganalisis faktor-faktor yang memengaruhi WTP. Pengumpulan data dilakukan melalui penyebaran kuesioner online pada akhir Februari hingga awal Mei 2023. Jumlah responden sebanyak 200 responden yang tersebar di wilayah Bogor dan Tasikmalaya. Analisis data pada penelitian meliputi analisis faktor, contingent valuation method (CVM), dan regresi logistik biner. Hasil penelitian menunjukkan (1) persepsi generasi muda terhadap sayuran organik meliputi persepsi kualitas sayuran organik, persepsi manfaat sayuran organik bagi lingkungan, persepsi kepercayaan terhadap sayuran organik, dan persepsi manfaat sayuran organik bagi kesehatan. (2) Sebagian besar responden bersedia membayar sayuran organik dengan harga lebih tinggi dan nilai WTP Bogor lebih rendah dibandingkan nilai WTP Tasikmalaya. (3) Faktor yang berpengaruh signifikan terhadap WTP generasi muda yaitu persepsi kepercayaan terhadap sayuran organik dan persepsi manfaat sayuran organik bagi kesehatan., The younger generation is the generation that has awareness of the environment and health. This generation tends to choose clean, organic, and natural foods. Organic vegetables are products with the highest consumption level among other organic agricultural products. Organic vegetables generally have a higher price, but can provide more health benefits than non-organic. The research objectives are (1) to identify young generation’s perceptions of organic vegetables compared to non organic vegetables, (2) to estimate willingness to pay (WTP) value of organic vegetables, and (3) to analyze the factors that influence WTP. Data collection was carried out by distributing online questionnaires from late February to early May 2023. The number of respondents was 200 respondents spread across the Bogor and Tasikmalaya areas. Data analysis in this research includes factor analysis, contingent valuation method (CVM), and binary logistic regression. The results showed (1) young generations’ perceptions of organic vegetables included perceived quality of organic vegetable products, perceived benefits of organic vegetables for the environment, perceived trust in organic vegetables, and perceived benefits of organic vegetables for health. (2) Most of the respondents are willing to pay for organic vegetables at a higher price and Bogor's WTP value is lower than Tasikmalaya's WTP value. (3) Factors that have a significant effect on the younger generation’s WTP are the perception of trust in organic vegetables and the perception of the benefits of organic vegetables for health.
Keyword: CVM, green consumerism, perception, WTP, young generation

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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