Judul: Taraf penggunaan mikroorganisme lokal tapai sebagai bioaktivator pembuatan pupuk organik campuran kotoran domba dengan batang pisang
Abstrak: Processing of animal waste such as sheep manure is one alternative to prevent environmental damage from animal waste. Until now, the processing of sheep manure to produce fertilizer is not optimized yet. Difficulty to get commercial bioactivator in Karawang causes this problem. To enrich the fertilizer, banana trunk could be used because of its high kalium content. This research purpose was to know the quality of organic fertilizer made using local microorganism of tapai. The data of organic fertilizer were analyzed using completely randomized design (CRD) with 3 replications. The data from planlation test were analyzed using completely randomized factorial design with 3 replications. Result showed that organic fertilizer made using activator local microorganism of tapai 1% and local microorganism of tapai 5% have same quality, but both of them have higher quality than the organic fertilizer made using activator local microorganism of tapai 10%. All plants using fertilizer have higer productivity than plant without fertilizer. It is concluded that fertiliezer usage of local mircroorganism of tapai 1% as an activator with dosage of 240 g have the higest productivity.
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Judul: Kualitas Pupuk Kompos Campuran Kotoran Ayam Dan Batang Pisang Menggunakan Bioaktivator Mol Tapai
Abstrak: Growth of organic product demand result in increasing organic fertilizer demand. Two problem in producing organic fertilizer are long time producing and poor quality fertilizer. Chicken manure and banana trunk are rich in nutrient. They can be used as good material for compost producing. MOL tapai is activator to shorten compost producing times. This research is to know the effect of MOL tapai with different concentration to compost quality. This research consisted of two steps. First step was compost producing and step two is plantation test. The data from compost producing were analyzed with using completely randomized block design. The data from plantation test were are analyzed using completly randomized factorial design. Result showed that MOL tapai concentration didn’t affect pH, N, P, K of compost, but affect C quality. Plantation test showed that dosage of fertilizer affect plant height, leaf quantity, stem dryed weight, and root dryed weight. It is concluded that MOL tapai additions at different levels relative does not affect the quality of compost produced. The use of different dosages of very real effect on the productivity of crop. The use dosage of 100 g gave the best growth response.
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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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