Judul: Pengaruh Bahan Stek dan Hormon IBA (Indole butiric acid) terhadap Keberhasilan Stek Jabon Merah (Anthocephalus macrophyllus)
Abstrak: A. macrophyllus has very small seeds, semi-recalcitrant seeds, short fruiting period and naturally spread out in the Eastern part of Indonesia that leads to limited production of quality seeds and seedlings. The objectives of this research was (1) to obtain a technology for cutting material preparation, (2) to test the cutting materials and IBA hormonal effect on the success rate of cuttings of jabon merah. The results showed that the technique for cutting material preparation could increase the shoot production in stem bending treatment in the first to tenth weeks after treatment in hedge orchard of 1 year old seedlings. NPK treatments in hedge orchard of 4 month old seedlings decreased the shoot production at the second and fourth weeks after treatments. Stem cutting materials were significantly affect the survival percentage of cuttings, rooted cutting percentage and number of shoots production. Shoot cutting materials was less satisfactory results because it was easy to produce cuttings wilt and roted easily.
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Judul: Resistensi Bibit Jabon Putih dan Merah (Anthocephalus spp.) terhadap Serangan Botryodiplodia theobromae Penyebab Penyakit Mati Pucuk
Abstrak: White and red jabon seedlings are very popular to nurserier, because of the benefits and can improve the economic. The main problem in nurseries are insects and diseases attack. One of the diseases is dieback disease. Dieback disease is caused by B. theobromae, that can make the seedlings death. These pathogens can attack passively and actively. Every plant has a mechanism of resistance to pathogen attack, either structural or biochemical, before and after attacked. This research aimed: (1) to test B. theobromae attacked with non wounded and wounded stem infection methods in jabons; (2) to study the structural and biochemical resistance of jabons to B. theobromae attacked; (3) to study the interaction between the species of jabons and stem infection methods in jabons to the resistance of jabon seedlings; (4) to obtain the most resistance species of jabons to B. theobromae attacked. This research used factorial completely randomized design that combined the species of jabons and stem infection methods in seedling. The structural resistance was done with studying the microscopy of infected and non infected jabon used scanning electron microscope. The biochemical resistance was done with studying the chemical compound of Jabons used phytochemistry analysis. The disease incidency of red jabon seedlings with non wounded stem infection methods were 80%, that were wider than white jabon seedlings were 30%. The disease severity of red jabon seedlings with non wounded stem infection methods were 16%, that were worse than white jabon seedlings were 12%. The response of the species of jabons and non wounded stem infection method for the disease severity showed the same severity. The disease incidency of red and white jabon seedlings with wounded stem infection methods were 100%. The disease severity of white jabon seedlings with wounded stem infection methods were 62%, that were worse than red jabon seedlings were 38%. The response of the species of jabons and wounded stem infection method for the disease incidency showed the same width high, but, the disease severity of white jabon seedlings were worse than red jabon seedlings. The incidency and the severity of disease in jabons with wounded stem infection methods were wider and worse than jabons with non wounded stem infection methods. The white jabon seedlings just had the necrotic resistance as the structural resistance after pathogen attacked. Before and after pathogen attacked of red jabon seedlings, structural resistance were showed with found the structure of trychomaes on the epidermis and the necrotic resistance. The biochemical resistance before pathogen attacked of red jabon seedlings were found secondary metabolites, aspecially, triterpenoid and steroid, but, for white jabon seedlings were just found steroid. After pathogen attacked of red jabon seedlings, the biochemical resistance were showed with found the increase in the content of phenol hydroquinon, tannin and the fixed of flavanoid, but, the white jabon seedlings had the increase in the content of flavanoid, tannin and the decrease of phenol hydroquinon.
Keyword: biochemical resistance, disease incidency, disease severity, stem infection methods, structural resistance

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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