Judul: Physiological Quality of Peanut Seed (Arachis hypogeae L.) Variety Kancil with Different Sizes
Abstrak: Kacang tanah merupakan tanaman kacang-kacangan penting yang memiliki kandungan protein dan lipid yang tinggi. Produksi dan produktivitas kacang tanah ditentukan oleh kualitas benih. Penelitian ini bertujuan untuk mengidentifikasi pengaruh ukuran benih terhadap viabilitas dan vigor benih kacang tanah (Arachis hypogaea L.). Penelitian dilaksanakan pada bulan Januari hingga April 2023 di Laboratorium Pengolahan Benih dan Laboratorium Pengujian dan Penyimpanan Mutu Benih, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian disusun dalam faktor tunggal Rancangan Acak Lengkap dengan tiga kali ulangan. Perlakuan berupa ukuran benih yang dikelompokkan menjadi 4 kelompok yaitu kecil (≤0,75 cm), sedang (kecil  x  besar), besar ( 1,13 cm), dan tidak dipilah. Ukuran besar dan sedang memiliki permukaan biji yang halus, sedangkan ukuran kecil memiliki permukaan biji yang keriput. Semua ukuran biji diidentifikasi biji bulat. Ukuran benih berpengaruh nyata terhadap vigor benih, namun tidak berpengaruh nyata terhadap viabilitas benih. Ukuran benih yang besar menunjukkan vigor yang lebih tinggi dibandingkan ukuran lainnya. Ukuran benih tidak berpengaruh nyata terhadap daya simpan benih yang ditunjukkan dengan perkecambahan benih setelah pemasakan dipercepat. Penggunaan benih ukuran besar yang memiliki vigor tinggi sangat diperlukan untuk produksi dengan lingkungan yang kurang baik., Peanut is an important legume crop that has high proteins and lipids content. Peanut production and productivity were determined by seed quality. This research was aimed to identify the effect of seed size to peanut (Arachis hypogaea L.) seed viability and vigor. The research was carried out from January to April 2023 in Seed Procesing Laboratory and Seed Quality Testing and Storage Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The research was arranged in single factor - A Completely Randomized Design with three reptitions. The treatment is seed size that was categorized in 4 groups, i.e small (≤0,75 cm), intermediate (small  x  large), large ( 1,13 cm), and unsorted. Large and intermediate sizes had smooth seed surface, while the small size had wrinkled seed surface. All the seed size were identified the round seed. The seed size has a significant effect to seed vigor, nevertheless did not significant to seed viability. Large seed size showed the higher vigor than other sizes. Seed size didn’t significant to seed storability vigor that was showed by germination of seed after the accelerated aging. The large seed size use that has high vigor is very required to unfavourable enviromentals production.
Keyword: AAT, diameter benih, intergritas membran, viabilitas, vigor, accelerated aging text, membrane integrity, seed diameter, viability

Judul: Pengaruh Pengusangan Cepat dan Penyimpanan Alami Terhadap Viabilitas Benih Beberapa Varietas Kacang Tanah (Arachis hypogaea L.).
Abstrak: The research aimed to determine the influence of rapid aging and natural storage of the viability on several varieties of peanuts seed that has different size and anthocyanin content. The research was conducted in February-May 2012 in Science and Seed Technology Laboratory, and Laboratory of Molecular Marker and UV-VIS spectrophotometer, Department of Agronomy and Horticulture, IPB. Bogor. The peanut seed that used were Kelinci, Kancil, Bison, and Tuban. The research include two experiments. The first experiment was the influence of rapid aging viability several varieties of peanut seeds. The second experiment was the influence of natural storage viability on several varieties of peanut seeds in. The research used completely randomized design (CRD) one factor with four treatment of rapid aging in 0, 24, 48, and 72 hours and natural storage in 0, 1, 2, and 3 months. The results showed that the varieties of Kelinci are small and low anthocyanin content not resistant to rapid aging and natural storage show by seed vigor. The varieties of Kancil are large and low anthocyanin content not resistant to rapid aging, but resistant to natural storage show by seed viability and vigor.Varieties of Bison high content of anthocyanin resistant to rapid aging and natural storage. Varieties of Tuban showed dormancy phenomen shown by viability and seed vigor increased.
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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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