Judul: Pola Aktivitas Tokek Rumah (Gekko gecko) Yang Dipelihara Secara Intensif
Abstrak: Tokek rumah (Gekko gecko) banyak dicari dan memiliki nilai jual yang tinggi karena dijadikan sebagai sumber makanan dan juga sebagai obat untuk menyembuhkan gatal-gatal pada tubuh, eksim, gangguan seksual, dan kanker. Penelitian ini bertujuan untuk mengetahui pola aktivitas tokek rumah (Gekko gecko) yang dibudidayakan secara intensif. Tokek yang digunakan sebanyak 4 pasang dengan mengamati tingkah laku (makan, minum, kawin, bersembunyi, sosial, istirahat, bersuara dan lokomosi) serta pencatatan suhu dan kelembapan kandang. Hasil penelitian dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa tokek lebih banyak melakukan aktivitas beristirahat yaitu sebesar 70,6%, bersembunyi 23,9%, bergerak atau lokomosi 5,09%, interaksi sosial 0,14%, makan dan minum 0,11%, bersuara 0,02% dan kawin 0,01%., The house gecko (Gekko gecko) is heavily sought after and has a high selling value because it is used as a food source and also as a medicine to cure itching on the body, eczema, sexual disorders, and cancer. This study aims to determine the pattern of activity of house geckos (Gekko gecko) which were cultivated intensively. 4 pairs of geckos were used by observing behavior (eating, drinking, mating, hiding, social, resting, vocalizing and locomotion) and recording the temperature and humidity of the cage. The research results were analyzed descriptively. The results showed that geckos often did resting activities, namely 70,6%, hiding 23,9%, moving or locomotion 5,09%, social interaction 0,14%, eating and drinking 0,11%, making sounds 0,02% and mating 0,01%.
Keyword: activity patterns,behaviors, gekko gecko, intensive

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 productivity 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.
Keyword: