Judul: Pendugaan Daya Gabung dan Nilai Heterosis Hasil Persilangan Half Diallel Cabai Rawit (Capsicum annuum L.).
Abstrak: The aim of this research was to study estimation general combining ability (GCA) and specific combining ability (SCA) of six bird pepper inbred lines (Capsicum annuum L.), heterosis and heterobeltiosis of fifteen bird pepper hybrids in half diallel crosses. The experiment were conducted from November 2013 to April 2014 using a randomized complete block design (RCBD) with three replications at Leuwikopo University Farm, IPB. Analysis of GCA and SCA were based on the Griffing’s model of diallel design method II. Heterosis values were predicted based on the average values of their parents and heterobeltiosis were predicted based on the average values of the highest parents. Genotype IPB C10 x IPB C174, IPB C160 x IPB C291, IPB C174 x IPB C291, dan IPB C291 x IPB C293 had positive SCA, heterosis, and heterobeltiosis values for some variable observed. Genotype IPB C10 x IPB C174 dan IPB C160 x IPB C291 had higher yield for each plant than the commercial varieties which were Sonar and Nirmala
Keyword: heterosis, half diallel, combining ability, bird pepper

Judul: Studi Heterosis dan Daya Gabung Karakter Agronomi Cabai (Capsicum annuum L.) pada Hasil Persilangan Half Diallel
Abstrak: Penelitian dilaksanakan sejak bulan November 2008 sampai dengan Juni 2009 di Kebun Percobaan Leuwikopo, IPB, Darmaga. Penelitian ini bertujuan untuk mengetahui nilai heterosis dan heterobeltiosis hibrida hasil persilangan enam tetua cabai secara setengah dialel (half diallel) serta kemampuan daya gabung umum (DGU) dan daya gabung khususnya (DGK). Material genetik yang digunakan terdiri atas enam tetua cabai yaitu, IPB C2, IPB C9, IPB C10, IPB C14, IPB C15, dan IPB C20 serta 15 hibrida hasil kombinasi persilangan setengah dialel. Rancangan lingkungan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal yang diulang tiga kali, sehingga terdapat 63 satuan percobaan. Setiap satuan percobaan terdiri atas 16 tanaman dengan 10 tanaman sebagai contoh. Hasil penelitian ini menunjukkan bahwa terdapat perbedaan yang nyata diantara genotipe-genotipe yang diuji untuk semua karakter kuantitatif yang diukur, kecuali untuk nilai DGK pada karakter tebal kulit buah, bobot berangkasan, dan persentase bobot layak pasar. Hibrida IPB C2 x IPB C14 dan IPB C9 x IPB C14 memiliki nilai heterosis dan atau heterobeltiosis, serta DGK yang tinggi pada karakter-karakter ukuran buah, karakter-karakter tumbuh, dan karakter produksi total per tanaman. Tetua IPB C2 merupakan penggabung terbaik untuk karakter umur berbunga, umur awal panen, bobot per buah, dan panjang buah. Tetua IPB C15 menjadi penggabung terbaik untuk Karakter produksi total per tanaman dan karakter-karakter tumbuh, kecuali umur berbunga dan umur panen, sedangkan tetua dengan DGU yang baik pada semua karakter ukuran buah dan karakter produksi total per tanaman adalah IPB C14. Berdasarkan pengujian komponenkomponen genetik dan nilai varians aditif dan dominan diketahui bahwa aksi gen aditif berperan dalam pengendalian ekspresi relatif seluruh sifat komponen hasil, sedangkan pada karakter tumbuh aksi gen dominan-lah yang lebih berperan.
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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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