Judul: Analisis Atribut Produk Yang Mempengaruhi Keputusan Pembelian Varanus Oleh Penggemar Reptil di Bogor dan Sekitarnya
Abstrak: Varanus are pledge export commodity in Indonesia, but not really explore by indonesian goverment. Varanus can be exported as a pet a side from exported the meat and skin. Indonesia had most species Varanus compared with any other countries. From 35 species in the world theres 20 species can be found in Indonesia and the quantity are increased. As time goes by a lot species and subspecies founded more in Indonesia. And the objective of this research are: 1) To analyses the purchasing decision of Varanus by reptile lovers. 2) To analyses the attribute of what dominan to push purchase of Varanus in for reptile lovers. Based on research in a procceses purchasing decision in a step to buy Varanus can be known in a introducing purchasing decision, motivation of buy the most dominant are needs of hobby, and the first benefit hope can be used as an entertained media and the level of consumer interactive are feels empty when they have no Varanus. In information research step, main source information and the most affect are internet and friends. The most feck unsure from Varanus advertise are motives of Varanus. Product information can be attention are perfectly phisically, and advertising can focused inVaranus purchasing. In evaluation step alternative, the main factor in Varanus purchase and expectation showed quality indicator of Varanus are motives spesification. On a purchasing decision, consumer refer to choose Varanus are phisically perfect, a place to buy Varanus are from internet, decision situation are planned, and the most buyed Varanus are V.Indicus. In a step of after purchasing behaviour, the attitude after purchasing feels by consumen are satisfied. In factor analyses, result of factor analyses formed 3 (three) factors who affect purchasing desicion Varanus product. First of all consist of variables of price, type, physic, colours, motives, treatment level, and body shape. Second factor consist of locality variables and size. Third factor consist of popularity variables. Variable of price, type, physic, colour, motives, treatment level, and body shape of Varanus are the most dominant variables and push purchasing desicion of Varanus.
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Judul: Herpetofauna Trade Via E-commerce in Indonesia
Abstrak: Pemasaran satwa liar dalam skala komersial saat ini berkembang melalui platform perdagangan elektronik, namun penelitian terkait perdagangan satwa liar di Indonesia khususnya herpetofauna melalui media internet masih terbatas. Penelitian ini bertujuan untuk menelaah perdagangan herpetofauna pada platform e-commerce yang populer di Indonesia yaitu Tokopedia, Shopee, Lazada dan Bukalapak dengan metode pengambilan data melalui aplikasi web scraping. Hasil penelitian didapatkan sebanyak 117 jenis herpetofauna dari 38 famili, yang terdiri dari 106 jenis reptilia dan 11 jenis amfibia. Kategori produk yang paling banyak ditawarkan adalah satwa hidup sebagai hewan peliharaan. Sebanyak 6 jenis termasuk dalam satwa dilindungi menurut Permen LHK No. 106 tahun 2018 yaitu Crocodylus porosus (buaya muara), Morelia viridis (sanca hijau), Python bivittatus (sanca bodo), Orlitia borneensis (kura-kura byuku), Varanus nebulosus (biawak abu-abu) dan Varanus panoptes (biawak argus). Perdagangan herpetofauna terbanyak terdapat di Jawa Barat kemudian Jakarta. Total nilai ekonomi yang dihasilkan selama tahun 2017 sampai 2022 sebesar Rp3.355.750.470., Sales of wildlife use on a commercial scale has now developed into various online platform, however research related to wildlife trade in Indonesia, especially herpetofauna through the internet is still limited. This study aims to examine the herpetofauna trade on a popular e-commerce platform in Indonesia, namely: Tokopedia, Shopee, Lazada and Bukalapak using web scraping application data retrieval method. The results recorded 117 species of herpetofauna from 38 families, comprising of 106 species of reptiles and 11 species of amphibians. The most offered product category is live animals as pets. Six species are included under the protected animals list according to the Ministry of Environment and Forestry No. 106 from 2018, namely Crocodylus porosus (saltwater crocodile), Morelia viridis (green tree python), Python bivittatus (burmese python), Orlitia borneensis (Malaysian giant turtle), Varanus nebulosus (clouded monitor) and Varanus panoptes (argus monitor). The most herpetofauna trade is in West Java, then Jakarta. The total economic value during the period of 2017 to 2022 is IDR 3,355,750,470.
Keyword: amphibian, economic value, reptile, trade

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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