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.
Keyword: 

Judul: Development of Rapid Viability Test Using Urine Sugar Analysis Paper for Peanut Seed (Arachis hypogaea L.)
Abstrak: Benih bermutu sangat penting untuk meningkatkan produksi dan mutu kacang tanah. Pengujian mutu benih dapat dilakukan secara langsung maupun tidak langsung. Penelitian ini bertujuan mengembangkan metode pengujian viabilitas secara tidak langsung pada benih kacang tanah menggunakan Urine Sugar Analysis Paper (USAP). Percobaan diawali dengan pembuatan lot benih menggunakan perlakuan penyimpanan selama dua bulan dengan perlakuan beberapa kemasan. Percobaan disusun dengan Rancangan Acak Lengkap (RAL) dengan faktor jenis kemasan yaitu aluminium foil, plastik polypropylene, plastik polyethylene, kertas, dan tanpa kemasan. Lot dengan viabilitas tertinggi dan terendah digunakan untuk percobaan USAP tahap 1. Percobaan USAP tahap 1 dilakukan untuk menentukan metode terbaik dari kombinasi perlakuan ukuran pemotongan benih dan lama perendaman yang disusun menggunakan RAL. Perlakuan ukuran pemotongan benih yaitu benih utuh, dibelah dua, dan dipotong enam. Perlakuan lama perendaman yaitu 0, 3, 6, dan 9 jam. Parameter yang diamati pada USAP yaitu glukosa, protein, dan massa jenis. Metode terbaik digunakan untuk menguji menggunakan USAP pada seluruh lot benih hasil penyimpanan pada tahap 2 USAP. Hasil pengujian didapatkan metode terbaik yaitu ukuran pemotongan benih potong enam pada lama perendaman 6 jam. Parameter protein dan massa jenis dapat membedakan lot benih viabilitas tinggi dan rendah serta berkorelasi positif terhadap uji daya hantar listrik. Kebocoran glukosa tidak terdeteksi sehingga tidak dapat digunakan untuk uji viabilitas dan vigor benih., Quality seeds are very important to increase the production and quality of peanuts. Seed quality testing can be done directly or indirectly. The purpose of this research is to develop an indirect viability testing method for peanut seeds using Urine Sugar Analysis Paper (USAP). The experiment was started by making seed lots using storage treatment. Seeds are stored for two months with the treatment of several packages. The experiment was arranged in a completely randomized design (CRD) with packaging type factors including aluminum foil, polypropylene plastic, polyethylene plastic, paper, and without packaging. The lots with the highest and lowest viability were used for the USAP stage 1 experiment. The USAP stage 1 experiment was carried out to determine the best method from a combination of treatments of seed cutting size and soaking time prepared using CRD. The treatment of seed cutting size was whole seed, halved, and cut into six. The long immersion treatments were 0, 3, 6, and 9 hours. The parameters observed in the USAP were glucose, protein, and density. The best method was used to test all seed lots at stage 2 of the USAP. The test results showed that the best method was the size of cutting the seeds into six pieces at 6 hours of soaking time. Protein and density parameters can distinguish high and low viability seed lots and have a positive correlation with the electrical conductivity test. Glucose leaks were not detected so they could not be used for seed viability and vigor tests.
Keyword: glucose, protein, specific gravity, storage, vigor

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.
Keyword: