Judul: Morphometrics and Body Weight Gain of Male House Geckos (Gekko gecko) at Different Temperatures
Abstrak: Tokek rumah (Gekko gecko) merupakan salah satu jenis tokek yang mempunyai nilai ekonomi tinggi. Hal ini terbukti dari tokek yang sudah lama dijadikan komoditas ekspor di Eropa, Amerika dan Asia. Penelitian ini bertujuan untuk menganalisis morfometrik dan pertambahan bobot badan tokek rumah jantan (Gekko gecko) pada perlakuan suhu berbeda. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan suhu berbeda, yaitu suhu 27,0-28,9 °C (P1), suhu 29,0-30,9 °C (P2), dan suhu 31,0-32,9 °C (P3) dengan pengulangan sebanyak empat kali. Penelitian ini menggunakan 12 ekor tokek jantan dengan berat badan 45-65 gram. Variabel yang diamati dalam penelitian ini adalah suhu dan kelembapan lingkungan, panjang ekor, panjang badan, panjang paha, panjang lengan atas, panjang moncong sampai kloaka, panjang total dan bobot badan. Hasil penelitian menunjukkan suhu 29,0-30,9 °C memberikan pertambahan bobot badan yang tinggi. Suhu yang berbeda tidak berpengaruh nyata terhadap morfometrik tokek rumah jantan tetapi berpengaruh nyata terhadap pertambahan bobot badan., Tokay geckos (Gekko gecko) is a type of gecko that has high economic value. This is proven by geckos which have long been used as an export commodity in Europe, America and Asia. This study aims to analyze the morphometrics and body weight gain of male house geckos (Gekko gecko) at different temperature treatments. This research used a Completely Randomized Design (CRD) with three different temperature treatments, namely 27,0-28,9 °C (P1), 29,0-30,9 °C (P2), and 31,0-32,9 °C (P3) with repetition four times. This study used 12 male geckos with a body weight of 45-65 grams. The variables observed in this study were environmental temperature and humidity, tail length, body length, femur length, humerus length, snouth vent length, length of total and body weight. The research results showed that a temperature of 29,0-30,9 °C provided a high increase in body weight. Different temperatures did not have a significant effect on the morphometrics of male house geckos but had a significant effect on body weight gain.
Keyword: bobot badan, morfometrik, Suhu, tokek rumah, Body weight, tockay gecko, morphometrics, temperature

Judul: Morphometrics and Body Weight Gain of Female Tokay Gecko (Gekko gecko) at Different Temperatures
Abstrak: Tokek rumah (Gekko gecko) adalah salah satu reptil yang tersebar di hampir semua pulau di Indonesia. Tokek adalah hewan pemakan serangga dan hewan arboreal. Sebagai makhluk ektotermik, Tokek menggunakan suhu sekitar untuk mendukung aktivitas makan dan metabolismenya. Penelitian ini bertujuan untuk menganalisis pengaruh suhu yang berbeda terhadap morfometrik dan pertambahan bobot badan tokek rumah betina. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan suhu yang berbeda, yaitu P1 (27,0-28,9 ?), P2 (29,0-30,9 ?), dan P3 (31,0-32,9 ?). Setiap perlakuan terdiri dari 4 ulangan, sehingga total terdapat 12 tokek rumah betina dengan rentang berat badan 45-65 g. Peubah yang diamati meliputi panjang ekor, panjang tubuh, panjang lengan atas, panjang paha, panjang total, panjang moncong sampai kloaka, dan berat badan. Perbedaan suhu tidak berpengaruh nyata terhadap morfometrik tokek rumah betina tetapi berpengaruh nyata (P<0,05) terhadap bobot badan. Suhu 29,0-30,9 ? memberikan pertambahan bobot badan (7,79±3,84 g) yang cukup tinggi dibanding dengan perlakuan suhu 27,0-28,9 ? dan 31,0-32,9 ?., The Tockay gecko (Gekko gecko) is one of the reptiles found on almost every island in Indonesia. Geckos are insectivorous and arboreal animals. As ectothermic creatures, geckos use the surrounding temperature to support their feeding activity and metabolism. This study aimed to analyze the effect of different temperatures on the morphometrics and weight gain of female house geckos. The study used a Completely Randomized Design (CRD) with three different temperature treatments: P1 (27,0-28,9 ?), P2 (29,0-30,9 ?), and P3 (31,0-32,9 ?). Each treatment consists of 4 replications, resulting in a total of 12 female house geckos with a weight range of 45-65 g. The observed variables included tail length, body length, forelimb length, thigh length, total length, snout-to-vent length, and body weight. The temperature differences did not significantly affect the morphometrics of female house geckos but did significantly affect (P<0.05) their body weight. The temperature of 29,0-30,9 ? resulted in a relatively high weight gain (7,79±3,84 g) compared to the temperature treatments of 27,0-28.9 ? and 31,0-32,9 ?.
Keyword: body weight, morphometrics, temperature, tockay gecko

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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