Judul: Kandungan Aflatoksin dan Analisis Titik Kritis pada Pengelolaan Pascapanen Jagung di Kabupaten Garut
Abstrak: Jagung merupakan bahan baku pakan utama dalam industri pakan maupun dalam penyusunan ransum pakan. Sampai saat ini industri pakan unggas masih berbasis corn-soya. Jagung mudah terkontaminasi aflatoksin, suatu metabolit sekunder dari cendawan Aspergillus flavus, A. parasiticus dan cendawan lainnya. Aflatoksin merupakan mikotoksin yang ditemukan pada tahun 1960, setelah terjadi kematian 100 000 ekor kalkun di Inggris, dan tingginya kejadian penyakit hati pada bebek di Kenya dan budidaya ikan trout di Amerika Serikat.
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Judul: Kandungan Aflatoksin dan Analisis Titik Kritis pada Pengelolaan Pascapanen Jagung di Kabupaten Garut
Abstrak: Corn is the major ingredients feedstuff. Feed ration in feedmill industry is based on corn-soya. Postharvested corn is susceptible to fungal invasion which able to produce fungal metabolites such as aflatoxin. The objectives of the research are (1) to get a description aflatoxin contamination in farmer, collecting sellers and whole sellers (2) to get a description of critical points an aflatoxin contamination (3) to get a correlation and regression between aflatoxin and moisture content, ash, organic matter, water activity both in corn kernel and corn meal. A total of 57 samples of corn which collected from farmers, collecting sellers and whole sellers in Garut regency have been investigated for the aflatoxin contamination and the critical points of its occurrence in postharvested corn. Sampling was done with purposive sampling method and aflatoxin content was detected by Enzyme Linked Imunosorbent Assay (ELISA). Other parameters were moisture content, ash, organic matter, water activity both in corn kernel and corn meal. The results showed that the highest contamination was found in whole sellers level. The critical points at farmers stage were due to spoilage corn from field unproper, shelling procedure and sun drying dependence . Critical points at collecting sellers stage were due to improper storage and sun drying dependence. Whereas critical point at whole seller stage was due to the improper mixing practice. Based on statistical analysis (SPSS 13.0), there was a positive correlation between percentage of damage kernels and aflatoxin content, coefficient correlation (r) = 0.552 in farmer level. In collecting sellers, between moisture content and aflatoxin content were negatively corelated with coefficient correlation (r) = -0.630 but organic matter and aflatoxin content were positively corelated with coefficient correlation (r) = 0.662. In whole sellers, there was no corelation which significan (alpha: 0.05) between aflatoxin and other parameter.
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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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