Judul: Pendugaan Parameter Genetik Karakter Morfologi Malai Sorgum dan Seleksi pada Generasi F2 Persilangan P1-150-20-A x Pulut 3
Abstrak: Penelitian ini bertujuan memperoleh informasi karakter malai sorgum pada nilai heritabilitas luas, koefisien keragaman genetik, dan mengidentifikasi aksi gen serta mengidentifikasi genotipe dalam populasi F2 yang memiliki potensi tinggi. Penelitian ini dilaksanakanpada bulan Februari 2022 sampai April 2022 di Kebun Percobaan Leuwikopo IPB. Metode yang digunakan dalam penelitian ini yaitu rancangan kelompok lengkap teracak dengan satu faktor genotipe dan tiga ulangan. Hasil analisis menunjukkan bahwa populasi F2 memiliki koefisien keragaman genetik yang tinggi dan nilai heritabilitas arti luas kategori sedang pada karakter morfologi malai yaitu panjang leher malai, bobot malai kering, dan bobot biji per malai. Karakter morfologi malai sorgum dipengaruhi oleh jumlah gen aditif dominan kecuali panjang leher malai, panjang cabang sekunder, dan bobot biji per malai. Nilai korelasi pada seluruh karakter berkorelasi positif nyata kecuali pada karakter panjang leher malai yang berkorelasi negatif nyata. Hasil seleksi menunjukkan peningkatan nilai rata-rata populasi terseleksi kecuali panjang leher malai., This research is aimed at obtaining information regarding the characteristics of panicle sorghum, which possesses a wide heritability value, and a genetic diversity coefficient, and identify gene action as well as to determine the genotypes in F2 population with high yield potential. This research was conducted in Leuwikopo Experimental Garden, IPB, between February and April 2022. The method employed by this research was a completely randomized block design with one genotypic factor and three replications. The research demonstrates that the F2 population included a high genetic diversity coefficient and broad meaning heritability in the medium category for panicle morphological characteristics such as panicle neck length, desiccated panicle weight, and seed weight per panicle. The morphological characters of sorghum panicles were influenced by the number of dominant additive genes except panicle neck length, secondary branch length, and seed weight per panicle. The correlation values of the on all characters are real positive correlations on the entire character except for the character length neck that is real negative correlated. The selection findings revealed an improvement in the chosen population's average value except for the character length neck.
Keyword: correlation, diversity, genotype, heritability, and power of outcome

Judul: Variability of Panicle Morphological Characters and Yield of  Sorghum (Sorghum bicolor (L.) Moench) in the F4 Generation.
Abstrak: Sorgum merupakan tanaman pangan penting kelima di dunia. Morfologis malai diduga mempengaruhi hasil sehingga dilakukan upaya untuk meningkatkan produktivitas dengan persilangan. Penelitian bertujuan menginfomasikan keragaman karakter malai dan hasil sorgum populasi F4 serta mengidentifikasi genotipe yang berpotensi hasil lebih baik dari tetua, dilaksanakan pada bulan Februari-Juli 2021 di Kebun Percobaan leuwikopo dan Laboratorium Pemuliaan Tanaman IPB. Rancangan yang digunakan adalah rancangan augmented- RKLT faktor tunggal berupa genotipe terdiri 40 genotipe uji hasil persilangan Kawali-Pahat dan 5 genotipe pembanding diulang 4 kali. Hasil analisis ragam menunjukkan genotipe berpengaruh nyata terhadap beberapa karakter. Genotipe 4, 32, 56, 57, 66, 67, 120, 126, 129, 133 dan 140 berpotensi untuk dikembangkan karena memiliki keragaan karakter agronomi, komponen hasil dan morfologi malai yang unggul. Karakter tinggi tanaman, lebar daun, bobot biomassa basah dan bobot 1000 butir dapat dijadikan sebagai karakter seleksi karena memiliki nilai heritabilitas yang tinggi dan koefisien keragaman genetik yang sedang sampai luas., Sorghum is the fifth most important food crop in the world. Morphology of panicle can be correlated to grain yield. Efforts have been made to increase productivity hybridization. The study aimed to obtain information on the genetic variabilty of panicle character and yield of sorghum in the F4 population and also identify genotypes that have better yield potential than parents. The experiment was conducted at Leuwikopo Experimental Farm and plant breeding laboratory IPB from February to July 2021. The experimental design used is Augmented Design-RCBD one factor, this genotype consists 40 genotypes of sorghum F4 from crosses Kawali-Pahat and 5 comparison varieties in 4 replications. The results of variance analysis showed that genotype had a significant effect on several characters. Genotype number 4, 32, 56, 57, 66, 67, 120, 126, 129, 133 and 140 have the potential to be developed into varieties because of superior performance of agronomic characters, yield components, and the morphology of panicle characters. Characters of plant height, width leaf, stover weight and weight of 1000 seed can be used as selection characters because of high heritability value and moderate to broad genetic variability coefficient.
Keyword: Augemnted design, Heritability, Panicle, yield

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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