Judul: Morphometrics and Growth of Juvenile Leopard Gecko  (Eublepharis macularius) with Feeding Crickets Dusted with Calcium Powder
Abstrak: Leopard gecko (Eublepharis macularius) adalah salah satu spesies tokek dan hewan peliharaan yang paling populer karena memiliki keragaman warna serta corak. Penelitian ini bertujuan untuk mengevaluasi pengaruh pemberian pakan jangkrik yang dibaluri serbuk kalsium terhadap morfometrik leopard gecko (Eublepharis macularius) remaja. Metode penelitian menggunakan uji T independen untuk membandingkan data morfometrik antara leopard gecko jantan maupun betina yang diberi kalsium dan yang tidak diberi kalsium. Leopard gecko jantan dan betina remaja yang digunakan sebanyak masing-masing 14 ekor. Pada penelitian ini menggunakan 2 perlakuan dan 7 ulangan pada masing-masing jenis kelamin. Hasil penelitian ini pada leopard gecko jantan remaja memiliki pertumbuhan yang berbeda nyata pada lebar kepala, panjang badan, panjang moncong-kloaka, dan panjang total, sementara pada leopard gecko betina remaja memiliki pertumbuhan yang berbeda nyata pada bobot badan, panjang badan, panjang ekor, panjang moncong-kloaka, dan panjang total. Berdasarkan hasil tersebut, pemberian kalsium pada leopard gecko remaja diperlukan untuk pembentukan kerangka dengan bertambahnya ukuran tubuh., Leopard gecko (Eublepharis macularius) is one of the most popular gecko and pet species due to its variety of colors and patterns. This study aims to evaluate the effect of feeding crickets coated with calcium powder on the morphometrics of juvenile leopard gecko (Eublepharis macularius). The research method used independent T test to compare morphometric data between male and female leopard gecko fed with calcium and those not fed with calcium. Juvenile male and female leopard geckos used were 14 each. In this study using 2 treatments and 7 replicates in each sex. The results of this study on juvenile male leopard geckos had significantly different growth in head width, body length, snout-cloaca length, and total length, while juvenile female leopard geckos had significantly different growth in body weight, body length, tail length, snout-cloaca length, and total length. Based on these results, calcium supplementation in juvenile leopard geckos is necessary for skeletal formation with increasing body size.
Keyword: bubuk kalsium, morfometrik, jangkrik, calcium powder, crickets, morphometrics, leopard gecko remaja, juvenile leopard gecko

Judul: Morphometrics of Sub-Adult Leopard Gecko (Eublepharis macularius) Fed Crickets Coated with Calcium Powder
Abstrak: Leopard gecko merupakan hewan insektivora atau pemakan serangga seperti ulat hongkong, ulat jerman, dan jangkrik. Penambahan bubuk kalsium pada pakan memiliki manfaat antara lain sebagai nutrisi pembentuk cangkang telur, pertumbuhan tulang, dan sebagai pencegahan MBD (Metabolic Bone Disease). Penelitian ini bertujuan untuk menganalisis morfometrik leopard gecko pra-dewasa dengan pemberian pakan jangkrik yang dilumuri bubuk kalsium. Penelitian ini menggunakan metode Uji-T independen dengan 2 perlakuan dan 7 ulangan pada leopard gecko jantan dan betina. Hasil penelitian menunjukkan bahwa pemberian jangkrik yang dibaluri bubuk kalsium sebagai pakan tidak berpengaruh terhadap pertambahan morfometrik dan bobot badan pada leopard gecko jantan dan betina umur pra-dewasa. Leopard gecko pra-dewasa jantan tidak membutuhkan tambahan bubuk kalsium, sedangkan betina memerlukan tambahan kalsium untuk persiapan reproduksi., The leopard gecko is an insectivorous animal, feeding on insects such as mealworms, superworms, and crickets. Adding calcium powder to their food has benefits including forming eggshells, promoting bone growth, and preventing MBD (Metabolic Bone Disease). This study aimed to analyze the morphometrics of sub-adult leopard geckos fed crickets coated with calcium powder. The study used the independent T-test method with 2 treatments and 7 replications on both male and female leopard geckos. The results showed that feeding crickets coated with calcium powder did not affect the morphometric growth and body weight of juvenile male and female leopard geckos. Juvenile male leopard geckos did not require additional calcium powder, while females need it for reproductive preparation
Keyword: bobot badan, body weight, morphometrics, bubuk kalsium, jangkrik, leopard gecko, morfomertik, calcium powder, crickets

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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