Judul: Biosintematika syzygium malaccense (L.) Merr & Perry di Sulawesi Selatan
Abstrak: S. malaccense mempunyai keanekaragaman pada daun, bunga dan buah. Penelitian S. malaccense dipandang perlu tidak hanya karena adanya dugaan bahwa tanaman ini telah mengalami erosi genetika, tetapi juga karena masih kurangnya informasi yang mengungkapkan tentang keanekaragaman dan hubungan kekerabatannya dari berbagai aspek, khususnya di Sulawesi Selatan yang diduga mempunyai keunikan tersendiri. Penelitian ini bertujuan untuk melihat keanekaragaman ciri morfologi, anatomi, sitologi, dan pola pita isozim S. malaccense di Sulawesi Selatan. Selanjutnya informasi keanekaragaman tersebut dimanfaatkan untuk membuat pengelompokan dan menganalisis kekerabatannya. laksanakan sejak Mei 1993 sampai Maret 1995. Pengamatan morfologi dilakukan di lokasi pengambilan sampel dan dilengkapi dengan pengamatan koleksi kering, koleksi basah, dan koleksi semai dan pengamatan anatomi daun kromosom dilakukan di Herbarium Bogoriense,..dst
Keyword: Syzygium malaccense, morfologi, anatomi, sitologi

Judul: Keanekaragaman, Struktur Populasi dan Pola Sebaran Syzygium di Gunung Baung Jawa Timur
Abstrak: The research of Syzygium diversity, its population structure and the distribution patterns were conducted in Gunung Baung Nature Park, East Java. A total of five block locations, each comprising five transect sections, were purposively selected to obtain data of the taxon diversity, population stucture and distribution patterns. The importance value index, the individual number of each stratum (stage class) (i.e. seedlings, saplings, poles and trees) and variance-to-mean ratio were calculated. The principal component analysis, cluster analysis, multiple linear regressions and canonical correspondence analysis were performed to determine the relationships between abiotic and biotic factors in regard with the presence of Syzygium. There were six species of Syzygium in Gunung Baung, Pasuruan, namely S. cumini, S. polyanthum, S. littorale, S. pycnanthum, S. racemosum, and S. samarangense. The population structure of Syzygium varied considerably, only S. pycnanthum and S. racemosum had an ideal structure. This was presumably due to some problems faced by the genus in the process of regeneration, especially during the seedling phase. The distribution patterns of the Syzygium members were generally grouped prefering fertile sites on the slopes. Altitude and the number of bamboo clumps became the determinant (influencing) variables affecting significantly the existence of Syzygium in this mount.
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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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