Judul: Edible Portion Domba Ekor Tipis dan Domba Ekor Gemuk di Jasa Pelayanan Akikah
Abstrak: Akikah is slaughtering of animals for children born in the rituals of religious Muslims. Javanese Thin Tailed and Javanese Fat Tailed is the type of sheep used to local animal akikah. Demand animals akikah highly variable in terms of weight body, it is expected would influence the part wich can be consumed. The purpose of this research was to evaluate the differences of edible portion of Javanese Thin Tailed and Javanese Fat Tailed sheep in akikah service. The research used 17 Javanese Thin Tailed and 5 Javanese Fat Tailed. The research was designed using random complete design and data was analized by analysis of covariance (ANCOVA) and slaughter weight was used as covariable. The results of this research showed that the carcass weight, carcass fat, and tail of Javanese fat tailed was higher (P<0.05) than the javanese thin tail. The percentage of carcass javanese Thin Tailed and javanese Fat Tailed were 42.56% and 44.37%, the edible portion of javanese Thin Tailed and javanese Fat Tailed were 75.34% and 70.90% and the inedible portion were 14.66% and 29.10%, respectively.
Keyword: akikah, edible portion, javanese fat tailed, javanese thin tailed

Judul: Identification of Sheep Breeds Slaughtered at  Aqiqah and Slaughterhouses (Case Study in Bogor City)
Abstrak: Domba memiliki peran penting dalam berbagai macam aspek kehidupan masyarakat seperti aspek pangan maupun ekonomi. Keragaman wilayah menyebabkan begitu banyak bangsa domba yang tersebar di seluruh dunia. Karakteristik performa fisik dapat membedakan antara satu bangsa dengan bangsa lainnya. Untuk mengidentifikasi jenis domba terdapat beberapa peubah yang diamati yaitu jenis domba, jenis kelamin, umur dan bobot sebelum dipotong. Tujuan penelitian untuk mengidentifikasi jenis domba yang dipotong di tempat akikah dan tempat pemotongan hewan khusus domba. Data penelitian ini diperoleh melalui identifikasi kualitatif dan kuantitatif menggunakan metode observasi. Data yang diperoleh dianalisis secara deskriptif. Data yang diperoleh selama penelitian dimasukkan ke dalam perangkat lunak Microsoft Excel dan diproses hingga ratarata, modus, nilai maksimum dan nilai minimum ditentukan. Hasil penelitian menunjukkan jenis domba yang sering dipotong adalah Domba Ekor Tipis (DET), sebagian besar yang dipotong berjenis kelamin betina (78%) dengan umur potong terbanyak pada 1-1,5 tahun (I1) dan rata-rata bobot potong sekitar 17,83±0,1 kg., Sheep play an important role in various aspects of society such as food and economy. The diversity of regions has resulted in many breeds of sheep spread across the world. Physical performance characteristics can distinguish one breed from another. To identify sheep breeds, several variables are observed, namely sheep breed, gender, age, and weight before slaughter. The purpose of the research is to identify the types of sheep slaughtered at places for aqiqah (Islamic ritual sacrifice) and special sheep slaughterhouses. The research data was obtained through qualitative and quantitative identification using observational methods. The data obtained was analyzed descriptively. The data collected during the research was entered into Microsoft Excel software and processed to determine averages, modes, maximum, and minimum values. The results of the research show that the most frequently slaughtered breed is the Thin-Tailed Sheep (Domba Ekor Tipis, DET), with the majority being female (78%), the most common slaughter age being 1-1.5 years (I1), and an average slaughter weight of about 17.83±0.1 kg.
Keyword: analisis deskriptif, Jenis Domba, Identifikasi

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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