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- Johnsson, Filip, 1960, et al.
(författare)
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In-furnace processes in a 235 MWe CFB boiler
- 2002
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Ingår i: Proc. of the 7th International Conference on Circulating Fluidized Beds. - 9780920804988 ; , s. 607-614
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Konferensbidrag (refereegranskat)abstract
- In an experimental project funded by the 5th Framework Programme of the European Community (EC), different measurement techniques are used to analyze in-furnace processes in a 235 MWe Circulating Fluidized Bed (CFB) boiler in Turow, Poland. The purpose of the project is to assess the insufficiently known features of large-scale CFB boilers. The furnace of the boiler has a cross-section of 21 x 10 meters and a height of 43 meters. The boiler is operated on a local brown coal. Steady state, as well as dynamic conditions, are studied. The project is unique in two respects: Firstly, several measurement ports are provided in the large CFB furnace for in-situ measurements in various locations on the furnace. Secondly, a number of measurement techniques are employed. These facilitate studies of hydrodynamic processes as well as local variations in gas components (such as O2, CO, THC) and solids materials. The paper describes the measurement techniques and provides examples of the first (hydrodynamic) results obtained by the in-situ measurements.
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| 2. |
- Nowak, Jacek, et al.
(författare)
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Modelling of the power pin diode under surge current conditions
- 2004
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Ingår i: MODERN PROBLEMS OF RADIO ENGINEERING, TELECOMMUNICATIONS AND COMPUTER SCIENCE, PROCEEDINGS. - LVOV : LVIV POLYTECH NATL UNIV. - 9665533800 ; , s. 529-532
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Konferensbidrag (refereegranskat)abstract
- Fast recovery silicon power diodes, having radiation induced recombination centres, operating under forward bias at large current densities and high temperatures, have been studied in a detailed way, both experimentally and with the help of device simulation Medici package. The comparison of the dynamic I-V characteristics with the results of numerical simulations is possible only when all the specific features of the measurement set-up are taken into account in the simulations. Such evaluation of the electro-thermal numerical model of the diode under experiment combined with the electro-thermal model of the experimental set-up as the boundary condition for Medici simulation is being presented. The main issue is the definition of the thermal boundary conditions.
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| 3. |
- Zmudzka, Katarzyna, et al.
(författare)
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Novel DNA Analogues with 2-, 3- and 4-Pyridylphosphonate Internucleotide Bonds : Synthesis and Hybridisation Properties
- 2003
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Ingår i: New Journal of Chemistry. - : Royal Society of Chemistry. - 1144-0546 .- 1369-9261. ; 27:12, s. 1698-1705
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Tidskriftsartikel (refereegranskat)abstract
- Oligothymidylates modified with stereodefined 2-pyridyl-, 3-pyridyl- and 4-pyridylphosphonate moieties at one or two juxtaposed internucleotide positions were prepared, and their avidity towards complementary single stranded DNA and RNA, as well as toward double stranded DNA were evaluated by UV melting temperature and CD studies. It was found that the sense of chirality at the phosphorus centre and the position of the nitrogen atom in the pyridyl ring of a pyridylphosphonate moiety are important factors governing stability of double- and triple-stranded complexes formed by these oligonucleotides. DNA/DNA and DNA/RNA duplexes containing oligothymidylate strands with R-P-pyridylphosphonate units differed only slightly from unmodified reference complexes. In contrast to this, the S-P-pyridylphosphonate derivatives exhibited lower binding affinity than both their R-P-counterparts and the unmodified reference oligonucleotide T-20. Triplexes of oligo(thymidyl pyridylphosphonate)s with hairpin oligomer d(A(21)C(4)T(21)) were found mostly to be thermodynamically slightly more stable in pH 7.4 and less stable in pH 5.0 than non-modified complexes. As expected, oligonucleotides with pyridylphosphonate internucleotide bonds were recognised by 3'- and 5'-exonucleases but the chimeric oligonucleotide chains were not cleaved at the modi. cation sites.
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