Judul: The Off-Season Flowering Induction of „Keprok‟ Citrus Tree (Citrus reticulata).
Abstrak: The purposes of this study were to study (1) the effectiveness of flowering induction treatments (Prohexadion-Ca, Paclobutrazol, and strangulation) toward Keprok, (2) the effectiveness of dormancy-breaking substance treatments (etephon, BAP, and KNO3) on the flowering of Keprok, and (3) the interaction effect between flowering induction treatment and dormancy-breaking substances on the flowering of Keprok. This research was conducted at orange farm in Tangkil, Caringin Bogor Sub-district which lasted from November 2012 until July 2013. This experiment used a separated block design (Split Block Design) which consisted of two factors. The first factor is the flowering induction consists of four levels i.e. control, Prohexadion-Ca, Paclobutrazol, and strangulation. Whereas, the second factor was the provision of dormancy -breaking substances consisted of four levels i.e. control, etephon, BAP and KNO3. From treatment combination, there were 16 trial units and 4 replications. As a result 64 plants were used. Young citrus tres used in this research have similarity of age (5 years). Flowering induction treatment, namely, Prohexadion-Ca, was applied to the leaves twice. The first application after flush getting mature and the second was one week after the first application was done, with a concentration of 500 ppm/ plant in a liter of water. Paclobutrazol was applied to the soil once after flush getting mature with of 2 g/plant in a liter of water. Strangulation was done by a wire twist with diameter of 2 mm. The wire was twisted at a height of 30 cm. The wire twist was made after trubus getting mature. Dormancy-breaking substance treatment was applied 45 (HSA) flowering induction. Each dormancy-breaking substance was in liter of water added with 200 ppm ethepon, 200 ppm BAP, and 40 g KNO3 for each tree. The results showed that the flowering induction treatments (Prohexadion-Ca, Paclobutrazol, strangulation) gives the significant effect to accelerate of flowering and increase the number of flower and fruit on keprok tree. Prohexadion-Ca treatment has ability to accelerate of flowering time better than Paclobutrazol. Paclobutrazol, Prohexadion-Ca and strangulation gives the effects to increase the number of fruit due to these treatments are able to increase the C/N rasio in the leaves tissue. Dormantion breaking treatments doesn‟t gives the significant effect to accelerate of flowering time and increase the number of flower and fruit.
Keyword: Gibberellin, residue, off-season production

Judul: Induksi Pembungaan Jeruk Siem Kintamani (Citrus reticulata B.) dengan Paclobutrazol dan Zat Pemecah Dormansi KNO3
Abstrak: Bali is one of the central citrus productions in Indonesia. One of the obstacles that occurs in the production of citrus is its seasonal characteristic, so when harvest time the citrus productions will be overflowed and it makes the citrus’ price fallen sharply. The aim of this research is to study the effectiveness of paclobutrazol and KNO3 for induction flowering in off-season on the Siem Kintamani citrus (Citrus reticulata B.). This research was conducted at Mangguh Village, sub-district Kintamani, Bangli Regency. The experimental design is two factors Randomized Complete Block Design (RKLT). The expirement used paclobutrazol as a flowering induction and KNO3 as a breaking-dormancy. The Paclobutrazol’s dose are 0.0 (control), 0.5, 1.0, and 1.5 g/plant and the dose of KNO3 are 0.0 (control), 20 and 40 g/plant. The result shows that paclobutrazol and KNO3 can not increase the flowering, fruitset, and fruits total than control. Paclobutrazol application was effectively reduced the number of buds and reduced the leaves total than control. The interaction between paclobutrazol and KNO3 decreased the production of the buds significanly
Keyword: flowering, KNO3, off-season, paclobutrazol, Siem Kintamani citrus

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: