Judul: Diversity of Agronomic Characteristics and Waxy of F3 Sorghum Population from  Pulut 3 x PI-150-20A Crosses
Abstrak: Sorgum dapat dijadikan sebagai bahan pangan alternatif menggantikan beras padi. Namun beras dari biji sorgum kurang disukai masyarakat. Karena itu diperlukan adanya perbaikan terhadap kualitas biji sorgum untuk memperoleh biji sorgum yang disukai oleh masyarakat. Penelitian ini bertujuan memperoleh pengetahuan tentang keragaman genetik dan seleksi pada karakter agronomi dan tipe waxy pada populasi F3 sorgum persilangan Pulut 3 x PI-150-20A. Penelitian dilaksanakan pada bulan Juli 2022 hingga November 2022 di Kebun BSIP Biogen, Cimanggu, Kota Bogor. Hasil penelitian menunjukkan rata-rata karakter kuantitatif yang beragam. Populasi F3 memiliki nilai tengah yang cenderung lebih kecil daripada kedua tetuanya. Aksi gen yang muncul yaitu epistasis komplementer dan epistasis duplikat dengan jumlah gen yang terlibat banyak pada mayoritas karakter. Heritabilitas arti luas dan koefisien keragaman genetik termasuk tinggi. Pengamatan tipe sorgum berdasarkan kadungan amilosa. Hasil dari pewarnaan biji menunjukkan bahwa populasi F3 sorgum persilangan Pulut 3 x PI-150-20A mayoritas bertipe waxy atau memiliki kandungan amilosa yang rendah.
Keyword: aksi gen, epistasis, heritabilitas, iodine staining

Judul: Variability of Agronomic and Amylose of Population F3 Sorghum Derived from a Cross Pulut 3 x Soraya 3
Abstrak: Penggunaan sorgum sebagai alternatif pangan di Indonesia belum cukup berkembang karena tekstur sorgum yang pera kurang disukai masyarakat. Perbaikan terhadap kualitas biji sorgum perlu dilakukan untuk memperoleh sorgum berbiji pulen dan diterima masyarakat. Penelitian ini bertujuan mendapatkan informasi keragaman genetik pada populasi F3 sorgum hasil persilangan Pulut 3 x Soraya 3 serta seleksi cepat genotipe sorgum dengan kadar amilosa rendah. Penelitian ini dilaksanakan pada Juli 2022 hingga Desember 2022 di Kebun BBPSI Biogen, Cimanggu, Kecamatan Bogor Barat, Kota Bogor. Hasil penelitian menunjukkan rata-rata karakter kuantitatif yang beraneka ragam. Jumlah gen yang terlibat terbagi menjadi dua macam yaitu banyak dan sedikit gen. Aksi gen yang muncul yaitu epistasis. Hasil pewarnaan pada endosperma biji menunjukkan sebagian besar sorgum populasi F3 bertipe waxy., The use of sorghum as an alternative food in Indonesia has not been sufficiently developed because of the texture of sorghum is not liked by the public. Improvements to the quality of sorghum grains need to be carried out to obtain fluffier grained sorghum and be accepted by the public. This study aimed to obtain information on genetic variation in F3 sorghum populations from Pulut 3 x Soraya 3 and to select sorghum genotypes with low amylose content. This research was conducted from July 2022 to December 2022 at the BBPSI Biogen, Cimanggu, Bogor City. The results showed that the mean value of quantitative characters varied. The number of genes involved is divided into two kinds, namely many and few genes. Gene actions that appear are epistasis. The results of seed staining on grain’s endosperm showed that the majority of F3 sorghum was the waxy type
Keyword: epistasis, gene action, selection, staining

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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