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Träfflista för sökning "L773:0003 2654 srt2:(1990-1994)"

Sökning: L773:0003 2654 > (1990-1994)

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1.
  • Mellqvist, Johan, 1965, et al. (författare)
  • Temperature dependence of the absorption spectra of nitrogen oxide, nitrogen dioxide and sulfur dioxide in the application of differential optical absorption spectroscopy
  • 1992
  • Ingår i: The Analyst. - 0003-2654 .- 1364-5528. ; 117:3, s. 417-418
  • Tidskriftsartikel (refereegranskat)abstract
    • An experimental set-up has been designed for measurements of differential absorption cross-sections ofgases at different temperatures. Preliminary measurements on NO, NO2 and SO2 have been carried out attemperatures between 20 and 400°C by using spectral resolutions in the range 0.26-0.95 nm. Thesemeasurements show that the differential absorption cross-sections for all three gases decrease continuouslywith increasing temperature. Large relative errors resulted when differential absorption cross-sectionsobtained at room temperature were used in the differential optical absorption spectroscopic technique forevaluation of the concentration of gases at high temperatures. The relative errors were of the order of 70% forSO2 and NOz and of the order of 20% for NO at 400°C.
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2.
  • Xie, Bin, et al. (författare)
  • Ferrocene-mediated thermal biosensor
  • 1993
  • Ingår i: The Analyst. - 0003-2654. ; 118:7, s. 845-848
  • Tidskriftsartikel (refereegranskat)abstract
    • A biosensor that combines electrochemistry and calorimetry was investigated. Using this sensor, glucose measurements were performed by employing glucose oxidase together with ferrocene as electron-transfer mediator. The electrochemical reaction was accomplished by applying a voltage between a platinum column (working electrode), in contact with a crushed reticulated vitreous carbon (RVC) matrix onto which glucose oxidase was immobilized, and platinum wires (counter electrodes) located at the inlet and outlet of the column. For detection, the thermal signal generated by the redox reaction was measured as opposed to measuring the electrochemical signal. By using this method, a linear range of glucose concentration up to 20 mmol l-1 was achieved.
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