Judul: Perbanyakan dengan Stek dan Produksi Tanaman Dandang Gendis ( Clinachantus nutans ) dengan Penggunaan Pupuk Organik.
Abstrak: This research consisted of two experiments. The first experiment aimed to find the number of nodes of stem cutting and organic media to produced plants to be planted in the field. This research used Randomized Complete Block Factorial Design. The second experiment objective was to find the highest shoot production using organic fertilizer. This research used Randomized Complite Block Design. The first experiment used cuttings 2, 3, and 4 nodes and manure treatment i.e : soil mixed with chicken manure, cow manure, chicken manure and rice-hull charcoal, cow manure and rice-hull charcoal 1:1:1 (v/v). The second experiment used chicken manure (10 tons ha -1), cow manure (10 tons ha -1),chicken manure (10 tons ha -1) and rice-hull charcoal (2 tons ha -1), cows manure (10 tons ha -1) and rice-hull charcoal (2 tons ha -1). The results of the first experiment showed that 3 node cuttings is the best treatment for producing plant in the nursery, while in the second experiment cow manure 10 tons ha-1 with rice-hull charcoal 2 tons ha-1 or 10 ton ha-1 chicken manure with rice-hull 2 ton ha-1 produced the highest shoot weight 10 weeks after planting.
Keyword: production, organic fertilizer, nursery, cuttings, Clinacanthus nutans

Judul: Pengaruh Pupuk Kandang Terhadap Produksi Sayur Fungsional Dandang Gendis (Clinacanthus Nutans) Yang Dapat Dipasarkan
Abstrak: Penelitian ini dilakukan di kebun organik University Farm, Desa Cikarawang, IPB, Dramaga, Bogor, Indonesia pada 06°31'LS, 106°44'BT, dengan ketinggian 207 m di atas permukaan laut. Tujuan penelitian ini untuk mengetahui produksi sayur dandang gendis yang dapat dipasarkan dengan perlakuan pupuk kandang. Penelitian ini menggunakan rancangan petak terbagi 2 faktor yaitu: jenis pupuk kandang ayam, sapi, dan kambing (sebagai petak utama) dan dosis pupuk kandang 300, 600, 900, 1 200, dan 1 500 g tanaman-1 (sebagai anak petak). Hasil penelitian menunjukkan pemberian jenis pupuk kandang kambing dapat memiliki hasil tertinggi terhadap seluruh peubah pada fase pertumbuhan dengan dosis 1 500 g tanaman-1 sedangkan pada fase panen dipengaruhi jenis pupuk kandang kambing dengan dosis tertinggi 1 200 g tanaman-1 yang memiliki bobot basah batang, bobot basah daun, bobot basah total, bobot kering batang, daun dan bobot basah yang dapat dipasarkan tertinggi.
Keyword: Pemanenan berulang, pertanian organik, sayuran fungsional, snake grass, pupuk kandang

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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