Judul: Evaluation of Using Meta Ads on the Purchase Intention of Yourgoodhabit’s Potential Customer
Abstrak: Meta ads sebagai platform digital marketing mengalami perkembangan pesat, perkembangan ini dimanfaatkan oleh Yourgoodhabit untuk mengoptimalkan penggunaannya dengan melakukan pengiklanan, akan tetapi tidak menunjukkan kenaikan tren penjualan. Menanggapi hal tersebut, perlu dievaluasi apakah penggunaan Meta ads dapat mempengaruhi niat beli calon pelanggan Yourgoodhabit. Niat beli dapat di prediksi dengan menggunakan komponen pada Theory of Planned Behavior. Data diolah menggunakan analisis deskriptif, STP dan analisis SEM-PLS. Hasil penelitian menunjukkan calon pelanggan Yourgoodhabit dominan berusia 21-35 tahun dan variabel subjective norms serta perceived behavioral control memiliki pengaruh positif dan signifikan terhadap niat beli pelanggan Yoourgoodhabit. Sedangkan variabel attitude tidak memiliki pengaruh terhadap niat beli pelanggan. Rekomendasi meliputi konten iklan pada Meta yang menyebarkan informasi mengenai manfaat dan khasiat produk serta menyebarkan informasi tata cara pembelian produk dalam iklan atau landing page., Meta ads as a digital marketing platform is experiencing rapid development, this development is used by Yourgoodhabit to optimise its use by advertising, but does not show an increase in sales trends. In response to this, it is necessary to evaluate whether the use of Meta ads can influence the purchase intention of potential Yourgoodhabit customers. Purchase intentions can be predicted using components on the Theory of Planned Behaviour. Data is processed using descriptive analysis, STP and SEM-PLS analysis. The results showed that Yourgoodhabit's prospective customers are predominantly 21-35 years old and the subjective norms and perceived behavioural control variables have a positive and significant influence on the purchase intention of Yoourgoodhabit customers. Meanwhile, the attitude variable has no influence on customer purchase intentions. Recommendations include advertising content on Meta that disseminates information about the benefits and efficacy of products and disseminates information on how to purchase products in advertisements or landing pages.
Keyword: Niat Beli, Theory of Planned Behavior, Meta ads, calon pelanggan, Yourgoodhabit

Judul: Analysis of the Effect of Utilitarian and  Hedonic Attributes on Impulse Buying with Cognitive and Affective Attitude
Abstrak: Pengguna internet di Indonesia tahun demi tahun mengalami peningkatan dari tahun ke tahun. Perkembangan tersebut membuat masyarakat menggunakan paylater menjadi salah satu jenis fintech technology yang sering digunakan oleh masyarakat. Saat konsumen berbelanja online, terdapat tiga jenis atribut, diantaranya, atribut utilitas, dan atribut hedonis. Atribut utilitas ini dapat memengaruhi perilaku konsumen yang merujuk pada cognitive attitude dan atribut hedonis ini berhubungan dengan persepsi konsumen mengenai utilitas dan fungsi dari sebuah objek yang merujuk pada sikap afektif. Cognitive dan affective attitude ini memiliki hubungan timbal balik yang dapat memungkinkan perilaku pembelian impulsif. Oleh karena itu, peneliti ingin menganalisis pengaruh utilitarian dan hedonic attributes terhadap perilaku impulse buying pada pengguna paylater di jabodetabek dengan pendekatan cognitive dan affective attitude. Penelitian ini menggunakan sampel sebanyak 235 responden pengguna paylater di Jabodetabek. Sampel penelitian ditentukan menggunakan metode non-probability sampling. Selanjutnya, hasil penelitian dianalisis menggunakan analisis deskriptif dan Structural Equation Modeling-Partial Least Squares (SEM-PLS)., Internet users in Indonesia are increasing year by year. This development makes people use paylater as one type of fintech technology that is often used by the public. When consumers shop online, there are three types of attributes, including utility attributes and hedonic attributes. These utility attributes can influence consumer behaviour which refers to cognitive attitude and these hedonic attributes relate to consumer perceptions of the utility and function of an object which refers to affective attitude. This cognitive and affective attitude has a reciprocal relationship that can enable impulsive buying behaviour. Therefore, researchers want to analyse the effect of utilitarian and hedonic attributes on impulse buying behaviour in paylater users in Jabodetabek with a cognitive and affective attitude approach. This study used a sample of 235 paylater user respondents in Jabodetabek. The research sample was determined using non probability sampling method. Furthermore, the research results were analysed using descriptive analysis and Structural Equation Modeling-Partial Least Squares (SEM-PLS).
Keyword: affective attitude, cognitive attitude, hedonic attributes, impulsive  buying, utilitarian attributes

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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