Judul: Pengaruh Dosis Pupuk Akar dan Pupuk Daun terhadap Pertumbuhan Bibit Saninten (Castanopsis argentea Blume A.DC)
Abstrak: Saninten (Castanopsis argentea) is one species of the tree producing wood, fruit, and also dye from the skin of fruit and bark that has economic value. Good quality of seed is necessary to get an optimal production. So we need to stimulate the growth, one of them by root and leaves fertilizing. This research was conducted in SEAMEO BIOTROP greenhouses bye use a complete randomized factorial design (CRD factorial). Treatment that is given is root fertilizing with consentrate of fertilizer 0 g, 2.5 g, and 5 g, which combine with leaves fertilizing with consentrate of fertilizer 0 g/L, 1g/L, 2 g/L, and 3 g/L. Root fertilizer was given one time on each, and leaves fertilizer given per 2 weeks for during 8 weeks observation. The parameters measured in this research were height of seedlings, diameter of seedlings, dry weight of seedlings, top root ratio, and seedlings quality index. The results showed that height of seedlings, diameter of seedlings, dry weight of seedlings, and seedlings quality index was significantly affected bye the treatment. The best treatment is combination of root fertilizer 2.5 g and leaves fertilizer 3g/L. This treatment could increas heigth of seedlings up to 56.47% compared with control. The diameter seedlings up 88.68% towards control. The increas of root and shoot dry weight were 54.40% and 73.43%, respectively. Seedlings quality index increased by 64.65%.
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Judul: Pembiakan Saninten (Castanopsis Argentea (Blume) A.Dc.) Melalui Stek Pucuk Dengan Zat Pengatur Tumbuh Komersial
Abstrak: Saninten (Castanopsis argentea (Blume) A.DC.) merupakan salah satu jenis pohon asli Indonesia yang bernilai tinggi dan memiliki buah yang bisa dikonsumsi sehingga kegiatan perbanyakan tanaman secara vegetatif perlu dilakukan. Tujuan penelitian ini adalah menguji pengaruh zat pengatur tumbuh (ZPT) komersial dan media tanam yang berbeda, serta interaksi keduanya terhadap pertumbuhan stek pucuk saninten. Penelitian ini menggunakan rancangan acak lengkap (RAL) dua faktor. Faktor pertama yaitu ZPT komersial dari Rootone-F, Rapid root, dan air kelapa. Faktor kedua yaitu media tanam berupa tanah, tanah arang sekam (1:1), dan pasir kompos (1:1). Pada penelitian ini persentase hidup stek sebesar 92.78% dan persentase berakar sebesar 40.56%. Hasil penelitian menunjukkan bahwa saninten dapat distek tanpa menggunakan ZPT komersial. Namun, interaksi ZPT dari air kelapa dengan media tanam pasir kompos memiliki respon jumlah akar primer dan sekunder tertinggi dan berbeda nyata dengan interaksi perlakuan lainnya.
Keyword: Castanopsis argentea, stek pucuk, zat pengatur tumbuh

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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