Judul: Pengaruh Perlakuan Matriconditioning Plus Inokulan Terhadap Pertumbuhan Tanaman, Hasil dan Mutu Benih Kedelai Hitam (Glycine soja)
Abstrak: The research purpose to study the effect of treatment matriconditioning plus inoculant on plant growth, yield and quality of seed of black soybean held in the greenhouse Balitkabi Malang and Experiment Garden IPB Bogor. The study was conducted two phases, 1. Rhizobium compatibility of black soybean and 2. Matriconditioning treatment to improve the efficiency of Rhizobium on growth, yield and quality of seeds of soybean black. The first study using two-factor treatments (Factor A: two levels of varieties, and factor B: the five levels of Rhizobium inoculation treatments) arranged in randomized complete blog design of four replications. The second study consisted of factor A (two levels varieties) and factor B (four levels of treatment matriconditioning) using a split plot design of four replications. The results showed that Rhizobium inoculant is more compatible to Detam 1 compared Detam 2. The treatment of matriconditioning plus Rhizobium inoculant using rice husk charcoal for 12 hours can increase the natural rhizobium population by 15-fold, increase N content of plant up to 17.9% compared to regular inoculation and 28% compared with no treatment and increase the chlorophyll content of leaves up to 7.8-fold compared with no treatment. Inoculation is performed in matriconditioning can increase Rhizobium infectivity by 17% compared to the normal way, but no effect on the black soybean seed yield and quality of seeds produced
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Judul: Pengaruh Nitrogen dan Rhizobium sp. terhadap Pertumbuhan dan Produksi Kedelai Hitam (Glycine soja) pada Budidaya Jenuh Air di Lahan Pasang Surut
Abstrak: This research aims to determine the optimum concentration of nitrogen fertilizer and influence of Rhizobium sp. as inoculant on the growth and production of black soybeans. The experiment was conducted in the tidal swamps of Banyu Urip village, sub District of Tanjung Lago, Banyuasin District, Palembang, South Sumatera Province from May to September 2013. This research used split plot design with three replications. The concentration of nitrogen as the main plot consisted of 0, 5, 10, and 15 g Urea l-1 water and the Rhizobium sp. as a subplot consist of plus Rhizobium sp. and without Rhizobium sp. Saturated soil culture (SSC) technique was used to support the cultivation of soybeans in tidal swamps. The results showed that the effect of the nitrogen concentration of 15 g Urea l-1 water tends to produce the highest productivity up to 3.775 ton ha-1 and more profitable economically. This is supported by leaf N content to be high at 15 g Urea l-1 water up to 4.89%. Addition of Rhizobium sp. is effective enough increase growth and production although not significantly different. The results also indicate that there is interaction of the two treatments on number of leaves at 4 WAP, then there is no interaction was found on the other variables.
Keyword: tidal swamps, saturated soil culture, Rhizobium sp, nitrogen, black soybean

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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