Judul: Pengaruh Boron dan Perendaman terhadap Perkecambahan dan Pengaruh Arang Sekam dan Boron terhadap Pertumbuhan Bibit Cendana (Santalum album Linn.
Abstrak: Characteristic of sandalwood germination is very slow and it is belong to slow growing tree spesies. The aim of this research was to test the effectiveness of boron on various concentrations and period of soaking to speed up the seed germination and to study the effect of combination treatment between boron and rice husk charcoal on the growth of sandalwood seedlings. The experimental design of research was factorial in Completely Randomized Design (CRD). The results of this research showed that the initial treatment of sandalwood seed in boron soaking on 400 ppm concentration could accelerate the sandalwood seed germination one weeks earlier with 42% germination percentage while control was 34.6%. The optimal Soaking of sandalwood seeds was 24 hours. Rice husk charcoal addition on 7.5% (w/w) in the growing medium and boron on 400 ppm concentration produced the best seedling quality index (SQI) of sandalwood seedling with the SQI value of 30 and 29 points, while the interaction of both got SQI at 26 points and 9 points for control.
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Judul: Pengaruh Penyimpanan dengan Metode Bangun Piramida terhadap Daya Berkecambah Benih Tumbuhan Obat Saga Pohon (Adenanthera pavonina L.)
Abstrak: Red sandalwood is usefull medical plant, the bark can be used as an anti bacterial medicine (for injury), can be processed into milk, used as materials for making jewelry, and other things. Although research for red sandalwood could be found in abundance there were limited on its seed strorage, due to that situation the studies about storage effect using pyramid shape method of red sandalwood needs to be done. The study was aimed to determine the effect of storage in the pyramid shape method to germination percentage of the seeds of medicinal plants Red sandalwood (Adenanthera pavonina L.). The research method consisted of two phases of activity, namely: (1) The stages of storage, including preparation of seed and seed storage, (2) stage of germination, including pre-germination, seed germination, treatment, and observation. Observed variable was the germination percentage. Experimental design that used was completely randomized factorial design consisted of 6 storing methods factor and 3 storing durations factor. Data were analyzed using the F test followed by Duncan test. The results showed that storage methods factor was significantly affected the germination of seeds; storage durations was very significantly affected the germination of seeds, whereas the interaction of methods and storage durations did not significantly affected the red sandalwood (A. pavonina) germination. The method of the lowest to the highest germination are: the pyramid without surface that has 13.33% of germination percentage, paper surface pyramid (paper pyramid) that has 13.67%, paper pyramid surface with holes/ventilation (ventilation pyramid ) that has 17.67%, kaolin-gypsum pyramid surface (kaolin-gypsum pyramid) that has 20.33%, silver paper pyramid surface that has a reflection (mirror pyramid) that has the 22.00 %. From the analysis of storage duration on the germination percentage showed that seeds planted immediately (0 week) have the lowest average of germinating which has 3.33% of germination, then the largest value is generated by 2 weeks storage duration which has 28.67% of germination, the germination decreased in the storage duration of 4 weeks which has 23% of germination. Storage methods factor was significantly affected the germination and storage durations was very significantly affect the seeds germination of red sandalwood (A. pavonina). The pyramid shape methods were not suitable for red sandalwood storage, the best results for storage duration factors was 2 weeks duration with the 28.67% of germination.
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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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