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: Matriconditioning plus inokulan Bradyrhizobium japonicum dan Azospirillum lipoferum serta fungisida terhadap pertumbuhan dan penambatan nitrogen kedelai (Glycine max (L.) Merrill)
Abstrak: Tujuan penelitian ini adalah untuk mempelajari sampai sejauh mana fungisida berpengaruh pada perlakuan matriconditioning plus inokulan Bradyrhizobium japonicum dan Azospirillum lipoferum terhadap kemampuan hidup bakteri dan pertumbuhan tanaman kedelai serta penambatan Nitrogen. Perlakuan matriconditioning menggunakan arang sekam (lolos saringan 210 μm), dengan perbandingan benih, media, air, adalah 9 (g) 6 (g) 8 (ml). Matriconditioning dilaksanakan pada suhu ruang (29 °C) selama 13 jam. Percobaan ini terdiri dari tiga tahap percobaan. Tahap pertama adalah penetapan konsentrasi fungisida non fitotoksik pada benih Kedelai. Percobaan ini bertujuan untuk mendapatkan konsentrasi fungisida yang tepat dan non-fitotoksik terhadap benih. Konsentrasi benomyl yang digunakan adalah 0.05 %, 0.10 % dan 0.15% dan mancozeb 0.04 %, 0.08 %, 0.12%, 0.16 %, 0.20 % dan 0.24 %. Pengamatan dilakukan terhadap tolok ukur daya berkecambah dan indeks vigor benih. Tahap kedua adalah kemampuan tumbuh Bradyrhizobium japonicum dan Azospirillum lipoferum pada berbagai konsentrasi fungisida benomyl. Percobaan ini bertujuan untuk mengetahui konsentrasi fungisida yang tepat dan non- fitotoksik terhadap kemampuan hidup bakteri. Pada percobaan ini dilakukan dua tahapan percobaan, untuk tahapan 1). Kedua jenis bakteri masing-masing diinokulasikan secara tunggal dan untuk tahapan 2). Kedua bakteri dicampur dengan menggunakan dosis fungisida hasil tahapan 1). Pengamatan dilakukan dengan menghitung populasi koloni bakteri yang dapat tumbuh dan dilakukan secara manual. Tahap ketiga adalah pertumbuhan dan penambatan Nitrogen Kedelai dari benih yang diberi perlakuan matriconditioning plus inokulan dan fungisida (percobaan rumah kaca). Percobaan ini bertujuan untuk mengetahui perlakuan matriconditioning plus inokulan B japonicum dan A. lipoferum
Keyword: Glycine max (L.) Merrill, Matriconditioning, Bradyrhizobium japonicum

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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