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Biological methods of ferric sulphate coagulant production with Thiobacillus ferrooxidans

100%

Wisniewski P. , Nawrocki J. , Grajek W.

nr 3

140-151

A packed-bed bioreactor with activated-carbon particles as a carrier matrix material inoculated with Thiobacillus ferroxidans was operated at a pH 1.30 to convert ferrous sulfate to ferric sulfate.The experimental variables were dillution rate, medium composition and Fe (I) ion concentration.The reactors were operated within a dillution rate range of 0.013 to 0.560/h and within a ferrous sulfate concentration range of 20 to 40 g/l.The aeration rate was 5-7 l/h.It was showed that replacement of the 9k medium with tap water had no negative effect on iron oxidation process.

Relationship between Sample Morphology and Carrier Diffusion Length in GaN Thin Films

51%

Godlewski M. , Goldys E. , Phillips M. , Böttcher T. , Figge S. , Hommel D. , Czernecki R. , Prystawko P. , Leszczynski M. , Perlin P. , Wisniewski P. , Suski T. , Bockowski M. , Grzegory I. , Porowski S.

nr 4-5

627-632

Scanning and spot-mode cathodoluminescence investigations of homo- and hetero-epitaxial GaN films indicate a surprisingly small influence of their microstructure on overall intensity of a light emission. This we explain by a correlation between structural quality of these films and diffusion length of free carriers and excitons. Diffusion length increases with improving structural quality of the samples, which, in turn, enhances the rate of nonradiative recombination on structural defects, such as dislocations.