Judul: Percentage of Carcass Weight and Commercial Cuttings of Third Generation IPB-D2 Male Candidate Breeds Aged 10 to 12 Weeks
Abstrak: Ayam IPB-D1 merupakan rumpun ayam lokal baru yang berhasil dikembangkan oleh Institut Pertanian Bogor. Dilakukan seleksi ayam IPB-D1 berdasarkan konsentrasi IgY dan titer antibodi ND untuk mendapatkan ayam kandidat galur IPB-D2. Penelitian ini bertujuan mengkaji persentase bobot karkas dan potongan komersial ayam jantan kandidat galur IPB-D2 G3. Ayam yang digunakan berjumlah 24 ekor ayam jantan kandidat galur IPB-D2. Peubah yang diamati adalah persentase bobot karkas dan potongan komersial. Data yang diperoleh dianalisis dengan uji deskriptif dan di uji t dengan ayam jantan kandidat galur IPB-D3 G1 dan ayam jantan IPB-D1 Sukabumi. Hasil penelitian menunjukkan persentase karkas ayam jantan kandidat galur IPB-D2 G3 meningkat. Ayam jantan kandidat galur IPB-D2 G3 memiliki bobot serta persentase karkas dan potongan komersial lebih tinggi dibandingkan dengan ayam jantan IPB-D1 Sukabumi. Ayam jantan kandidat galur IPB-D2 G3 memiliki kualitas karkas yang baik., IPB-D1 chicken is a new local chicken breed successfully developed by Bogor Agricultural University. IPB-D1 chickens were selected based on IgY concentration and ND antibody titer to obtain IPB-D2 candidate strains. This study aimed to assess the percentage of carcass weight and commercial cuts of IPB-D2 G3 candidate roosters. The chickens used amounted to 24 roosters of IPB D2 candidate strains. The observed variables were the percentage of carcass weight and commercial cuts. The data obtained were analyzed by descriptive test and t-test with IPB-D3 G1 and IPB-D1 Sukabumi candidate roosters. The results showed that the carcass percentage of IPB-D2 G3 candidate roosters increased. IPB-D2 G3 candidate roosters had higher carcass weight and percentage and commercial cuts compared to IPB-D1 Sukabumi roosters. IPB-D2 G3 candidate roosters had good carcass quality.
Keyword: ayam IPB-D2, bobot karkas, potongan komersial

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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