Judul: Karakteristik Pertumbuhan dan Produksi Delapan Varietas Kacang Tanah (Arachis hypogaea L.).
Abstrak: The research was aimed to indentify the growth characteristics that influence filling of the pod and productivity of the groundnut. This research was conducted at Leuwikopo Experimental Field, Departement of Agronomy and Horticulture, IPB, Dramaga, on February to June 2010. The method of this research was based on a completely block randomized design, consisted of one factor and three repetitions. The factor was eight varieties, namely Pelanduk, Sima, Gajah, Turangga, Panther, Anoa, Kelinci, and Kidang. The data was analyzed by using F test. If there was significantly difference then it would be followed by Duncan Multiple Range Test (DMRT). The result showed that varieties affect signifficantly to the total of leaves, branch, and peg, weight of leaves, branch, and peg, and lenghth of the plants in several weeks of observations. Each varieties has difference characteristics of gowth and production. Pelanduk had highest growth characteristics. Gajah was the fastest on pod filling. Panther had highest growth parameter and production variables. Anoa was not really good at growth characteristic and pod filling so the productivity was low. Kidang had high dry matters and good at pod fillling. Sima, Kelinci, and Turangga had high total pod, but not so good at pod filling.
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Judul: Keragaman dan korelasi antara peubah pertumbuhan dan produksi pada delapan varietas kacang tanah (Arachis hypogaea L.)
Abstrak: Penelitian ini bertujuan untuk mengamati karakteristik pertumbuhan yang mempengaruhi pengisian polong dan produksi pada delapan varietas kacang tanah. Penelitian dilaksanakan di Kebun Percobaan Lewikopo, Darmaga, Bogor dari Februari hingga Juli 2010. Lokasi penelitian memiliki jenis tanah Latosol. Metode penelitian menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan tiga kali ulangan. Perlakuan terdiri dari satu faktor yaitu delapan varietas kacang tanah sehingga terdapat 24 satuan percobaan. Varietas kacang tanah yang digunakan adalah varietas Badak, Garuda3, Jerapah, Kancil, Mahesa, Singa, Tapir, dan Trenggiling. Analisis data menggunakan uji F dan apabila terdapat pengaruh nyata maka dilanjutkan dengan uji Duncan Multiple Range Test (DMRT). Analisis korelasi dilakukan antara peubah pertumbuhan dan komponen produksi. Hasil percobaan menunjukkan varietas Mahesa memiliki pertumbuhan tajuk yang baik selama pertumbuhan tetapi jumlah polong total dan bobot kering polong per tanaman yang dihasilkan nyata lebih rendah yang berdampak pada rendahnya produktivitas polong dan biji. Varietas Garuda3 memiliki pertumbuhan tajuk yang baik hanya sampai fase pembentukan polong. Jumlah polong total per tanaman yang dihasilkan nyata terendah tetapi baik dalam pengisian polong sehingga menghasilkan persentase polong penuh yang tinggi. Varietas Singa memiliki pertumbuhan tajuk yang rimbun selama pertumbuhan tetapi menghasilkan bobot kering polong yang rendah karena pertambahan jumlah ginofor banyak sehingga kurang dalam waktu pengisian polong dan banyak menghasilkan persentase polong cipo. Varietas Kancil memiliki pertambahan daun, batang, dan polong yang tidak mencolok selama pertumbuhan. Produktivitas polong dan biji yang dihasilkan tinggi yang didukung oleh rata-rata jumlah polong penuh yang dihasilkan tinggi sehingga persentase polong penuh juga tinggi akibat dari waktu pengisian polong yang panjang…dst
Keyword: Arachis hypogaea L., Varieties, Production, Growth, Witchess broom

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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