Judul: Morphometrics of IPB-D1, IPB-D2 and IPB-D3 Chickens aged 4 to 12 weeks at Sinar Harapan Farm Sukabumi
Abstrak: Ayam IPB-D1 adalah ayam lokal pedaging unggul hasil pemuliaan. Pengembangan ayam IPB-D1 menghasilkan calon galur ayam IPB-D2 dan IPB-D3. Penelitian mengenai morfometrik ayam IPB-D di Kabupaten Sukabumi belum dilakukan. Penelitian ini bertujuan mengevaluasi morfometrik ayam IPB-D1, IPBD2 dan IPB-D3 di Kabupaten Sukabumi. Rancangan pada penelitian ini adalah Rancangan Acak Lengkap dengan 3 taraf perlakuan galur yaitu IPB-D1, IPB-D2 dan IPB-D3 dengan selang kepercayaan 95%. Perlakuan yang berpengaruh nyata dilanjutkan uji Tukey. Parameter yang diukur adalah bobot badan dan morfometrik seperti panjang shank, lingkar shank, panjang femur, panjang tibia, panjang dada, lebar dada, dalam dada, lingkar dada, dan panjang punggung. Hasil penelitian menunjukkan bahwa ukuran tubuh ayam IPB-D2 dan IPB-D3 berbeda. Ayam IPBD3 memiliki morfometrik yang lebih besar dibandingkan ayam IPB-D2 pada umur 4-8 minggu, namun pada umur 10-12 minggu ayam IPB-D3 memiliki ukuran tubuh yang lebih kecil dibandingkan ayam IPB-D2. / IPB-D1 chicken is a local breeder of superior broilers. The development of IPB-D1 chicken produced the candidate strains IPB-D2 and IPB-D3. Research on the morphometrics of IPB-D chicken in Sukabumi district has not been conducted. This study aimed to evaluate the morphometrics of IPB-D1, IPB-D2 and IPB-D3 chickens in Sukabumi District. The design of this study was a completely randomized design with 3 levels of treatment strains namely IPB-D1, IPB-D2 and IPB-D3 with 95% confidence interval. Treatments that had a significant effect were followed by the Tukey test. Parameters measured were body weight and morphometrics such as shank length, shank circumference, femur length, tibia length, breast length, breast width, breast depth, breast circumference and back length. The results showed that the body size of IPB-D2 and IPB-D3 chickens were different. IPB-D3 chickens have larger morphometrics than IPB-D2 chickens at 4- 8 weeks of age, but at 10-12 weeks of age IPB-D3 chickens have a smaller body size than IPB-D2 chickens., IPB-D1 chicken is a local breeder of superior broilers. The development of IPB-D1 chicken produced the candidate strains IPB-D2 and IPB-D3. Research on the morphometrics of IPB-D chicken in Sukabumi district has not been conducted. This study aimed to evaluate the morphometrics of IPB-D1, IPB-D2 and IPB-D3 chickens in Sukabumi District. The design of this study was a completely randomized design with 3 levels of treatment strains namely IPB-D1, IPB-D2 and IPB-D3 with 95% confidence interval. Treatments that had a significant effect were followed by the Tukey test. Parameters measured were body weight and morphometrics such as shank length, shank circumference, femur length, tibia length, breast length, breast width, breast depth, breast circumference and back length. The results showed that the body size of IPB-D2 and IPB-D3 chickens were different. IPB-D3 chickens have larger morphometrics than IPB-D2 chickens at 4- 8 weeks of age, but at 10-12 weeks of age IPB-D3 chickens have a smaller body size than IPB-D2 chickens.
Keyword: morfometrik, ayam IPB-D1, ayam IPB-D2, ayam IPB-D3, Kabupaten Sukabumi

Judul: Morphometrics of Fifth Prospective Generation IPB D2 Chickens Aged 4 to 12 Weeks
Abstrak: Ayam IPB-D2 merupakan ayam lokal hasil seleksi ayam IPB-D1 yang ditujukan untuk memiliki keunggulan tahan penyakit, pertumbuhan cepat, dan mampu beradaptasi pada lingkungan tropis. Penelitian ini bertujuan mengkaji dan mengevaluasi ukuran tubuh ayam IPB-D2 generasi kelima umur 4 sampai 12 minggu. Peubah yang diukur mencakup panjang shank, lingkar shank, panjang femur, panjang tibia, panjang dada, lebar dada, dalam dada, lingkar dada, panjang punggung, panjang sayap. Data peubah diukur setiap 2 minggu dan dianalisis secara deskriptif dan uji-t. Hasil penelitian menunjukkan 3 dari 10 peubah meliputi lingkar shank, panjang dada, dan dalam dada memiliki ukuran yang lebih rendah dibandingkan ayam IPB-D2 G4. Koefisien keragaman ayam IPB-D2 G5 pada umur 12 minggu berkisar 4,56%-9,79%. Nilai koefisien tersebut menunjukkan populasi yang sudah mendekati seragam dari segi karakteristik ukuran sehingga ayam IPB-D2 G5 bisa diajukan sebagai calon galur., IPB-D2 chickens are local chickens resulting from IPB-D1 chicken selection, which are intended to be disease-resistant, fast-growing, and able to adapt to tropical environments. This study aims to study and evaluate the body size of fifth-generation IPB-D2 chickens aged 4 to 12 weeks. The variables measured include shank length, shank circumference, femur length, tibia length, chest-length, chest width, chest depth, chest circumference, back length, and wing length. Variable data was measured every 2 weeks and analyzed descriptively and analyzed by t-test. The results showed that 3 out of 10 variables including shank circumference, breast length, and chest depth were lower than IPB-D2 G4 chickens. The diversity coefficient of IPB-D2 G5 chickens at 12 weeks of age ranges from 4.56% to 9.79%. This coefficient value shows that the population is nearly uniform in terms of size characteristics, which means IPB-D2 G5 chickens can be proposed as a candidate strain.
Keyword: IPB-D2 chickens, selection, morphometrics, crossing

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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