Judul: Keragaman Genetik, Heritabilitas, Dan Analisis Koefisien Lintasan Pada Plasma Nutfah Gandum (Triticum Aestivum L.) Koleksi Balitbiogen
Abstrak: The aims of this experiment are to study the geneUc variation, heritability of the wlleat germplesm collection and cotrelation among chafllctelS using pathcoefficient analysis. This experiment was conducted at Rice Research Station in Kuningan, West Java on June until October 2002 using RandOmized Completely Block Design (RCBD) with three replications. each of the twenty-seven genotypes of wheat was planted on four rows with 3 m lenght. The interrow and interplant spacing were 25 em and 10 em, respectivity. Deta obtained from the twenty-seven genotypes were subjected to variance analysis and the heritability of the traits _mated by component of variance method. Correlation coefflcients were computed according to the formula of Goulden (1959). Direct and indirect path coefflcients were calculated as described by Dewey and Lu (1959). High geneUc varianon displayed by l00-grain weight, numberofUllelS per plant and number of spikes per plant The esUmation of heritability ranged from 0 to 94.58%. The days to nower, plant height, spike length, number of greins per spike, and l00-grain weight were uncotrelated with grain yield per plant. In the other hand, the days to harvest, number of tillelS per plant, number of Spikes per plant, dry spikes weight, and harvest spikes weight were positively and significanty correlated with grain yield per plant. The number of graints per plant, number of spikes per plant, number of grains per spike, and l00-grein weight each had a posiwe direct effect on grain yield per plant. The indireci effect on grain yield per plant via number of tillers and number of Spikes (productive tillers ) per plant showed by days to harvest, dry Spikes weight, and harvest Spikes weight. The number of productive tillers per plant was a good criteria to be used towards improvement of grain yield.
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Judul: Performance of Wheat (Triticum aestivum L) F2.5 Lines at Medium Elevation
Abstrak: Gandum (Triticum aestivum L) telah menjadi bahan pangan alternatif di Indonesia, terutama dalam bentuk tepung terigu. Volume impor gandum dan konsumsi tepung terigu di Indonesia terus meningkat dari tahun ke tahun. Oleh karenanya perlu diatasi dengan merakit varietas adaptif dan berdaya hasil tinggi melalui program pemuliaan tanaman. Penelitian dilaksanakan di lahan petani Cisarua Bogor yang terletak pada ketinggian ± 600 m dpl pada bulan Januari hingga Mei 2020. Penelitian dilakukan dengan menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Bahan tanam yang digunakan terdiri atas 20 galur F2.5 hasil seleksi pedigree dari populasi HP1744/Selayar dan 3 varietas pembanding (Selayar, HP1744, dan Guri 3). Dua dari tiga varietas pembanding tidak tumbuh karena viabilitas benih sudah tidak baik. Hasil penelitian menunjukkan bahwa galur-galur yang diuji memiliki keragaan yang kurang baik karena terjadi cekaman kekeringan dan suhu tinggi. Karakter agronomi yang berkorelasi nyata secara positif dengan bobot biji per tanaman adalah tinggi tanaman, panjang malai utama, jumlah spikelet, jumlah biji malai utama, jumlah biji malai anakan, jumlah anakan total, dan jumlah anakan produktif. Heritabilitas tinggi teramati pada karakter jumlah floret hampa malai utama, jumlah anakan produktif, dan umur panen. Karakter jumlah anakan produktif dan umur panen memiliki keragaman genetik yang luas., Wheat (Triticum aestivum L) has become an alternative food in Indonesia, especially in the form of wheat flour. The volume of Indonesia’s wheat imports and flour consumption has increase from year to year. Therefore it needs to be overcome by assembling adaptive and high-yielding wheat varieties through plant breeding programs. The research has done in Cisarua Bogor farmer land located at ± 600 m asl in January to May 2020. The research was conducted using a completely randomized block design with three replications. The plant material used consisted of twenty F2.5 lines from pedigree selection from HP1744/Selayar populations and three check varieties (Selayar, HP1744, and Guri 3). Two of the three check varieties did not grow because seed viability was not good. The result showed that the tested wheat lines had poor performance due to drought and high temperature stress. The agronomic character that correlate positively with grain weight per plant are plant height, length of main panicle, number of spikelet, number of main panicle seeds, number of tiller panicle seeds, total number of tillers, and number of productive tillers. The time to maturity character is negatively correlated with grain weight per plant. High heritability was observed in number of empty florets of the main panicle, number of productive tillers, and age of harvest. The characters of the number of productive tillers and has a time to maturity have wide genetic diversity variability.
Keyword: correlation, genetic variability, heritability, pedigree selection

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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