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: Differences in Carcass Characteristics and Meat Quality  among Indonesian Sheeps
Abstrak: Keragaman rumpun domba lokal menghasilkan perbedaan karakteristik karkas dan kualitas daging. Penelitian bertujuan untuk mengetahui dan menganalisis perbedaan karakteristik karkas dan kualitas daging antar rumpun domba Indonesia. Penelitian ini menggunakan seratus dua puluh ekor domba jantan dengan pola pemeliharaan yang sama. Variabel yang diamati pada penelitian ini yaitu bobot hidup, bobot karkas, persentase karkas, panjang karkas, karkas dingin, pH, keempukan, persentase susut masak, serta daya ikat air. Hubungan antara karakteristik karkas dengan kualitas daging antar rumpun domba dilakukan dengan menggunakan metode analisis General Linear Model (GLM). Hasil penelitian menunjukan bahwa bobot hidup, bobot karkas, persentase karkas, panjang karkas, bobot karkas dingin, pH, keempukan, serta persentase susut masak berpengaruh secara signifikan (P<0,001) terhadap rumpun domba. Kesimpulan dari penelitian ini yaitu domba ekor gemuk memiliki karakteristik karkas yang paling baik dibandingkan domba lainnya, serta domba compass agrinak memiliki kualitas daging yang lebih unggul dari domba lainnya., The diversity of local sheep breeds results in differences in carcass characteristics and meat quality. The study aimed to determine and analyze differences in carcass characteristics and meat quality between Indonesian sheep breeds. This study used one hundred and twenty sheep with the same maintenance pattern. The variables observed in this study were live weight, carcass weight, carcass percentage, carcass length, cold carcass, pH, tenderness, cooking loss percentage, and water-binding-holding capacity. The relationship between carcass characteristics and meat quality among sheep breeds was conducted using the General Linear Model (GLM) analysis method. The results showed that live weight, carcass weight, carcass percentage, carcass length, cold carcass weight, pH, tenderness, and cooking loss percentage significantly affected sheep breeds (P<0.01). This study concluded that fat-tailed sheep have the most superior carcass characteristics compared to other sheep, and jonggol sheep have superior meat quality than other sheep.
Keyword: carcass characteristic, meat quality, sheep

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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