Judul: Carcass and Non Carcass Charasteristics of  Candidate Chicken Strain IPB-D3 Fourth Generation at Slaughter Age 12 Week
Abstrak: Indonesia kaya akan sumber daya genetik ayam lokal dengan daya tahan dan adaptasi lingkungan yang baik, namun produktivitasnya rendah. Ayam IPB-D1 merupakan ayam hasil perbaikan genetik dari ayam lokal Indonesia kemudian diseleksi berdasarkan pertumbuhan bobot badannya sebagai calon ayam galur IPB D3. Penelitian ini bertujuan untuk mengevaluasi karakteristik karkas dan non karkas calon galur ayam IPB-D3 generasi keempat umur 12 minggu. Ayam yang digunakan adalah ayam jantan calon galur ayam IPB-D3 G4 sebanyak 20 ekor. Penelitian dilaksanakan pada bulan November 2023 sampai Februari 2024 di Laboratorium Lapang Pemuliaan dan Genetika Ternak, Fakultas Peternakan, IPB University. Peubah yang diamati yaitu bobot dada, paha atas, paha bawah, sayap, punggung, kepala, leher, ceker, hati, usus, rempela, jantung, paru-paru, dan limfa. Data dianalisis dengan uji deskriptif dan uji T. Hasil penelitian menunjukkan persentase karkas calon galur ayam IPB-D3 G4 lebih kecil dan persentase non karkas yang lebih besar dari calon galur ayam IPB-D3 G1. Karkas dan non karkas ayam IPB-D3 G4 umur 12 minggu berturut-turut sebesar 59,71% dan 29,85%., Indonesia is rich in genetic resources of local chickens with good endurance and environmental adaptation, but their productivity is low. IPB-D1 chicken is a chicken that is the result of genetic improvement from local Indonesian chickens and then selected based on body weight growth as a candidate for the IPB-D3 chicken line. This study aims to evaluate the carcass and non-carcass characteristics of prospective fourth generation IPB-D3 chicken lines aged 12 weeks. The chickens used were 20 roosters of the IPB-D3 G4 chicken breed. The research was carried out from November 2023 to February 2024 at the Animal Breeding and Genetics Field Laboratory, Faculty of Animal Husbandry, IPB University. The variables observed were the weight of the chest, upper thigh, lower thigh, wings, back, head, neck, feet, liver, intestines, gizzard, heart, lungs and spleen. Data were analyzed using descriptive tests and T tests. The results showed that the carcass percentage of the prospective IPB-D3 G4 chicken line was smaller. The percentage of non carcass was greater than the prospective IPB-D3 G1 chicken line, respectively at 59.71% and 29.85%.
Keyword: ayam IPB-D2, ayam IPB-D3, bobot karkas, bobot non karkas

Judul: Comparison of Carcass and Non-Carcass Weight  Percentage between IPB-D2 Chickens and IPB-D3 Chickens at Different Slaughter  Age
Abstrak: Ayam IPB-D1 sebagai rumpun baru ayam lokal merupakan upaya meningkatkan mutu genetik ayam lokal Indonesia. Ayam IPB-D2 dan IPB-D3 keturunan ayam IPB-D1 diseleksi untuk dijadikan calon indukan ayam IPB-D1 unggul. Penelitian ini bertujuan menambah informasi, mengkaji, dan membandingkan persentase bobot karkas dan non-karkas pada galur ayam IPB-D2 dan IPB-D3 pada umur potong berbeda. Ayam yang digunakan sebanyak 30 ekor untuk masing masing galur. Peubah yang diamati yaitu bobot dada, paha atas, paha bawah, sayap, punggung, kepala, leher, ceker, hati, usus, rempela, dan jantung. Data yang diperoleh dianalisis dengan uji deskriptif dan uji t. Hasil penelitian menunjukkan persentase bobot karkas ayam jantan IPB-D2 G4 lebih kecil dibandingkan dengan ayam jantan IPB-D3 G2. Persentase bobot non-karkas ayam jantan IPB-D2 G4 lebih besar dari ayam jantan IPB-D3 G2. Ayam IPB-D3 memiliki peluang yang unggul sebagai calon galur pejantan dan ayam penghasil daging. Ayam IPB-D2 memiliki peluang yang unggul sebagai calon galur betina., The IPB-D1 chicken as a new species of local chickens is an effort to improve the genetic quality of Indonesia's local chickens. Chicken IPB-D2 and IPB-D3 incubators of chicken IPB-D1 were selected for special breed chicken IPB-D1. The study aims to add information, review, and compare the percentage of weight of carcass and non-carcass in chicken galleys IPB-D2 and IPB-D3 at different cut ages. Chickens used up to 30 chickens each. The observed change was the weight of the chest, upper thigh, lower thigh, wing, back, head, neck, neck, claw, liver, intestines, and heart. Data obtained was analyzed with a descriptive and t-test results showing a percentage of cock weight in IPB-D2 G4 cock was smaller than the IPB-D3 G2 cock. Non-carcass a cock IPB-D2 G4 was greater than a cock IPB-D3 G2. The chicken IPB-D3 has a distinct chance of becoming a male and flesh-producing hen. The IPB-D2 chicken has an excellent opportunity as a female trowel.
Keyword: carcass weight, IPB-D2 line chicken, IPB-D3 line chicken, non-carcass  weight

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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