Judul: Efektivitas Teknik Perbanyakan Fungi Mikoriza Arbuskula dari Spora Tunggal dengan Tanaman Centrosema pubescens dan Pueraria javanica.
Abstrak: Limited availability of forage was caused by few constraints, like dry season, limited land, low productivity of forage, and cultivation management which is not optimal. Arbuscular Mycorrhizal Fungi (AMF) is one of microorganism that can be used to solve that problems. AMF needs host plant for its growth. This research aimed to evaluate the efectivity of multiply technique from a single spore by host plant Centrosema pubescens and Pueraria javanica. The treatment of this research is the difference kind of AMF that being used to roots inoculation. P1= Gigaspora margarita, P2= Acaulospora tuberculata, P3= Glomus etinucatum. Parameters in this research are percentage of growth plants, succeded infection precentage, the amount of spores and root infection. Result shows that the most effective AMF from single spore are Acaulospora tuberculata and Glomus etinucatum with the host plant Centrosema pubescens. Pueraria javanica only effective to growth of Acaulospora tuberculata.
Keyword: Pueraria javanica, AMF, Arbuscular Mycorrhizal Fungi, biofertilizer, Centrosema pubescens, forage availabity

Judul: Teknik Produksi Inokulan Mikoriza Arbuskula Menggunakan Media Pasir dan Tanah Latosol pada Tanaman Inang Pueraria javanica dan Centrosema pubescens.
Abstrak: Pupuk hayati fungi mikoroza arbuskula (FMA) terbukti dapat membantu tanaman untuk menyerap unsur hara dari dalam tanah. Ketersediaan pupuk hayati FMA yang sulit ditemukan di pasaran menyebabkan perlu adanya teknologi tepat guna yang lebih ekonomis. Tujuan penelitian ini adalah optimalisasi sistem produksi inokulan FMA dengan menggunakan tanaman inang Pueraria javanica dan Centrosema pubescens pada media tanam pasir kali dan campuran pasir kali dan tanah. Penelitian ini menggunakan rancangan acak lengkap dengan dua faktor dan 3 ulangan. Faktor pertama adalah media tanam pasir kali (M1) dan campuran pasir kali dan tanah latosol (1:1) (M2) dan faktor kedua adalah jenis pupuk yakni pupuk kompos 100% (P1), pupuk NPK 100% (P2) dan campuran pupuk kompos dan NPK (1:1) (P3). Hasil penelitian menunjukkan bahwa produksi inokulan FMA dengan tanaman inang Pueraria javanica dan Centrosema pubescens efektif pada media tanam pasir. Produksi spora FMA tertinggi menggunakan tanaman inang Centrosema pubescens. Tidak ada korelasi antara bobot kering tajuk tanaman dan produksi jumlah spora.
Keyword: fungi mikoriza arbuskula (FMA), media tanam, tanaman inang

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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