Judul: Pengaruh Media Tanam dan Zat Pengatur Tumbuh Sitokinin (BA) terhadap Perbanyakan Tunas Pisang Raja Bulu (Musa Paradisiaca L.) dari Cacahan Bonggol.
Abstrak: Banana is the important and the highest production of Indonesian fruits. The propagation of banana using corm pieces known as the cheap and effective method, that also gives diseases resistance to shoots. Furthermore, this research aimed to determine the effect of growing media types and doses of BA to increase the healthy shoots and to make the propagation of Raja bulu banana from corm pieces faster. Research used Randomize Complete Block Design (RKLT) with two factors. The first factor were cytokines (BA) with four dosages (A1:10 ppm, A2:10 ppm, A3:20 ppm, and A4:30 ppm). The second factor was growing media composition consisting of B1: soil, B2: husk charcoal, B3: husk charcoal + soil, B4: and husk charcoal + cow manure. The results showed that no interaction between media and cytocines, except from dead corm percentage at 9 weeks after planting. The media's treatment only affected the variable number of buds on the hump, number of roots, number of root corms, number of roots of the root corms, and the dead corm percentage. The most number of buds on the hump was obtained from the husk charcoal + cow manure media at 2 weeks after planting. The highest of roots on 9 weeks after planting, the highest of root corms on 7 weeks after planting, and the highest of roots of the root corms on 9 weeks after planting were obtained from the husk charcoal media. The highest dead corm percentage was obtained from the soil media at 9 weeks after planting. Cytokines BA did have no significant influence to plantain bud multiplication of Raja bulu banana from corm pieces.The pests and diseases in the soil were reduced by using of husk charcoal + cow manure media. Hence, it was suggested to use husk charcoal + cow manure media without application of cytokines to produce Raja bulu banana’s shoots.
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Judul: Pengaruh media tanam dan zat pengatur tumbuh sitokinin (BA) terhadap perbanyakan tunas pisang raja bulu (Musa paradisiaca L.) dari cacahan bonggol
Abstrak: Penelitian ini bertujuan untuk menentukan jenis media, dosis sitokinin BA, dan interaksi keduanya dalam perbanyakan pisang Raja bulu dari cacahan bonggol untuk menghasilkan bibit yang sehat dalam jumlah banyak, cepat, murah, dan dapat diaplikasikan oleh petani. Penelitian dilaksanakan di Kebun Penelitian IPB Tajur, Bogor, selama 3 bulan, yaitu pada bulan April 2012 – Juli 2012. Penelitian menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dua faktor, yaitu: pemberian BA dan jenis media tanam dengan masing-masing empat taraf perlakuan sehingga akan didapatkan 16 kombinasi perlakuan. Taraf media tanam terdiri dari tanah (B1), arang sekam (B2), arang sekam + tanah (B3), dan arang sekam + pupuk kandang sapi (B4).Taraf dosis BA, yaitu: 0 ppm (A1), 10 ppm (A2), 20 ppm (A3), dan 30 ppm (A4). Setiap perlakuan terdiri atas tiga ulangan sehingga terdapat 48 satuan unit penelitian, dst
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Banana, Cytokinin BA, Growing media

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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