Judul: Keragaan Pertumbuhan Padi Genotipe F1 Dan Galur Tetua Pada Kondisi Tercekam Suhu Tinggi
Abstrak: Percobaan dilaksanakan di rumah kaca Kebun Percobaan University Farm IPB, Cikabayan, Dramaga, Bogor. Tujuan Penelitian untuk mendapatkan informasi tentang keragaan karakter pertumbuhan genotipe F1 padi dan seluruh tetuanya pada kondisi cekaman suhu tinggi. Rancangan yang digunakan adalah rancangan acak lengkap dengan 3 ulangan. Bahan tanam yang digunakan adalah varietas padi sebagai tetua yaitu Mekongga, Situ Patenggang, IPB 6R, Marinah, IR64, dan IPB 4S serta 9 genotipe F1 yang dihasilkan melalui persilangan antara tetua yaitu Marinah x Mekongga, IR64 x Mekongga, IPB 4S x Mekongga, IPB 6R x Situ Patenggang, Marinah x Situ Patenggang, IR64 x Situ Patenggang, IPB 4S x Situ Patenggang, Marinah x IPB 6R, IR64 x IPB 6R. Peubah yang diamati adalah tinggi tanaman 45 hari setelah semai (HSS), tinggi tanaman 110 HSS, kehijauan daun 45 HSS, kehijauan daun 110 HSS, jumlah anakan total, jumlah anakan produktif, umur heading, umur berbunga, umur panen, panjang malai, jumlah gabah hampa, jumlah gabah bernas, jumlah gabah total, persen gabah hampa, bobot gabah bernas, dan bobot 1000 butir. Hasil genotipe menunjukkan dampak yang signifikan terhadap tinggi tanaman 110 HSS, kehjauan daun 110 HSS, jumlah anakan total, jumlah anakan produktif, umur panen, panjang malai, jumlah gabah hampa, jumlah gabah bernas, jumlah gabah total, persen gabah hampa, bobot gabah bernas, dan bobot 1000 butir. Hasil penelitian menunjukkan bahwa ada perbedaan rerata tinggi tanaman 110 HSS, kehjauan daun 110 HSS, jumlah anakan total, jumlah anakan produktif, umur panen, panjang malai, jumlah gabah hampa, jumlah gabah bernas, jumlah gabah total, persen gabah hampa, bobot gabah bernas, dan bobot 1000 butir antara genotipe yang diamati . IPB 6R, Marinah, dan IPB 4S merupakan penggabung terbaik untuk karakter yang diamati pada kondisi suhu tinggi.
Keyword: F1, padi, kondisi, suhu tinggi

Judul: Respon Pertumbuhan Beberapa Genotipe F1 Padi (Oryza sativa L.) terhadap Cekaman Suhu Tinggi
Abstrak: The experiment was conducted on Maret to June 2014 at the Experimental Farm Bogor Agricultural University, Cikabayan, Dramaga, Bogor. The purpose of research was to observation the effect of high temperature on the crossing-genotypes, got the tolerant crossing-genotypes, and created the genotype that has the best heterosis and heritability value. In this research, there are 4 the crossing-genotypes that tolerant in high temperature, namely: IPB 4S x Situ Patenggang Marinah x IPB 6R, IPB 4S x IPB 6R, and IPB 4S x IR64. The result of research showed that the number of total tillers, productive tillers, the number of filled out stalks, the mass of filled out/plant, the mass of empty stalks/plant, the total mass of stalks, and the mass of thousand grain was very significantly different for all of genotypes. The number of tillers total 45 DAP (days after planting), the age of flowering, the age of harvesting, the number of empty stalks, and the percentage of filled out stalks was significantly different for all of genotypes. The height of plant 45 DAP and harvesting, the greening of leaf 45 DAP and harvesting, the capacity period, the height of panicle, and the number of stalks total was not significantly different.
Keyword: Bogor Agricultural University (IPB), heritability, the productive tiller, plant height

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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