Judul: The Performance of Male Tokay Geckos by Providing Different Condition of Crickets As Feed, The Performance of Male Tokay Geckos by Providing Different Condition of Crickets As Feed
Abstrak: Tokek rumah (Gekko gecko) adalah hewan reptil satwa harapan yang mempunyai potensi untuk dikembangkan. Saat ini populasinya terancamakibat perburuan liar sehingga perlu dibudidayakan. Penelitian ini bertujuan untuk menganalisis performa tokek jantan (ukuran morfometri dan pertambahan bobot badan) yang diberi pakan jangkrik pada kondisi berbeda. Peubah yang diamati adalah pertambahan morfometrik dengan parameter berupa tail length (TL), base of tail (BT), body length (BL), femur length (FL), radius length (RL), humerus length (HL), width of head (WH), length of head (LH), snout-vent length (SVL), dan produktivitas (pertambahan bobot badan). Penelitian ini menggunakan 20 ekor tokek jantan yang diambil dari alam dan dipelihara selama 42 hari dengan pemberian jangkrik pada kondisi berbeda. Data penelitian dianalisis menggunakan statistik deskriptif, uji-T berpasangan dan uji-T tidak berpasangan. Hasil menunjukan bahwa pemberian jangkrik pada kondisi pakan bergerak memberikan pertambahan pada ukuran morfometrik dan bobot badan sedangkan pada kondisi pakan diam mengalami penyusutan., The domestic tokay gecko (Gekko gecko) is a hopeful animal reptile that has the potential to develop, whose population is currently threatened by wild hunting so it needs to be cultivated. The study aimed to analyze the performance of male tokek (morphometric measurements and body weight gains) given to an anchor in different conditions. The observed variables are morphometric additions with parameters such as tail length (TL), base of tail (BT), body length (BL), femur length (FL), radius length (RL), humerus length (HL), width of head (WH), length of head (LH), snout-vent length (SVL), and productivity. The study used 20 males who were taken from nature and kept for 42 days with anchorage in different conditions. The research data was analyzed using descriptive statistics, pairs-T tests and non-pairs T tests. The results showed that the administration of anchorage in moving feed conditions resulted in an increase in morphometric size and body weight while in non-moving feed conditions there was a shrinkage.
Keyword: criket, feed, morphometric, productivity, tokay gecko

Judul: Morfometrik dan Produktivitas Tokek Rumah (Gekko gecko) yang Dipelihara Secara Intensif dengan Pemberian Maggot
Abstrak: Tokek rumah (Gekko gecko) adalah hewan reptil yang pada umumnya dapat ditemukan di tempat asalnya, yaitu Asia Tenggara termasuk Indonesia, yang mana saat ini populasinya terancam akibat perburuan liar sehingga perlu dibudidayakan. Penelitian ini bertujuan untuk mengamati morfometrik dan produktivitas tokek rumah yang dipelihara secara intensif sebagai informasi dasar dalam pembudidayaan tokek rumah. Peubah yang diamati adalah pertambahan morfometrik dengan parameter berupa tail length (TL), base of tail (BT), body length (BL), femur length (FL), radius length (RL), humerus length (HL), width of head (WH), length of head (LH), snout-vent length (SVL), dan produktivitas (pertambahan bobot badan). Penelitian ini menggunakan lima pasang tokek jantan dan betina yang diambil dari alam dan dipelihara selama empat minggu dengan pemberian maggot sebagai pakan. Data penelitian dianalisis menggunakan statistik deskriptif dan uji-T berpasangan. Hasil menunjukkan bahwa pemberian maggot memberikan pengaruh yang baik terhadap pertambahan morfometrik tokek rumah baik jantan maupun betina namun berpengaruh negatif tehadap pertambahan bobot badan., Tokay geckoes are reptiles which are commonly found in its’ original habitat, Southeast Asia including Indonesia, which is currently under threat of population decline due to illegal hunting hence need to be reared. The purpose of this research is to observe the morfometrics and productitvity of intensively reared tokay geckoes as basic information in tokay gecko farming. Variables observed are morfometrics with parameters in the form of tail length (TL), base of tail (BT), body length (BL), femur length (FL), radius length (RL), humerus length (HL), width of head (WH), length of head (LH), snout-vent length (SVL), and productivity (body weight gain). This research used five pairs of male and female tokay geckoes taken from nature and reared for four weeks and given maggot as feed. Data from the research is analyzed using descriptive statistics and paired T-test. Results showed that feeding tokay geckoes with maggot gave good effect on morfometrics both on male and female but negatively affecting body weight gain
Keyword: morfometrics, productivity, tokay 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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