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Träfflista för sökning "WFRF:(Thorsén Anders) srt2:(2005-2009)"

Sökning: WFRF:(Thorsén Anders) > (2005-2009)

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1.
  • Sjödahl, Johan, et al. (författare)
  • Chip with twin anchors for reduced ion suppression and improved mass accuracy in MALDI-TOF mass spectrometry
  • 2005
  • Ingår i: Analytical Chemistry. - : American Chemical Society (ACS). - 0003-2700 .- 1520-6882. ; 77:3, s. 827-832
  • Tidskriftsartikel (refereegranskat)abstract
    • A new sample target for matrix-assisted laser desorption/ionization mass spectrometry is described. The target consists of pairs of elevated hydrophilic anchor surfaces, positioned in proximity onto a microchip. The anchors are used to obtain separate preparations of sample and external standard, while both anchor surfaces are irradiated simultaneously by the laser pulse. Using a standard, based on six peptides, a 2-fold improvement in mass accuracy is observed. Also, ion suppression is significantly reduced. With a one peptide calibration standard, 22 tryptic fragments from a BSA digest are detected using the twin-anchor concept, whereas only 14 fragments are detected when the sample and standard are laser-ablated as a mixture from a conventional anchor target. A volume of similar to30 pL of sample solution of angiotensin I is transferred to the anchor surface, under a thin layer of a perfluorocarbon, to prevent a concentration bias due to evaporation. With this arrangement, a detection limit of 1.5 amol was achieved with a signal-to-noise ratio of 22:1.
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2.
  • van der Wijngaart, Wouter, et al. (författare)
  • A seat microvalve nozzle for optimal gas-flow capacity at large-controlled pressure
  • 2005
  • Ingår i: Journal of microelectromechanical systems. - 1057-7157 .- 1941-0158. ; 14:2, s. 200-206
  • Tidskriftsartikel (refereegranskat)abstract
    • Seat microvalves are the most common microvalve type for gas-flow control. This paper presents a general method for optimizing the flow capacity of a seat valve nozzle and diminishing the requirements on the valve actuator's stroke length. Geometrical analysis and finite element (FE) simulations show that for controlling large gas flow at elevated pressure, the optimal nozzle design in terms of flow capacity for a given actuator performance is a multiple-orifice arrangement with miniaturized circular nozzles. Experimental results support the design introduced in this paper.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Thorsén, Anders (2)
Stemme, Göran (1)
Roeraade, Johan (1)
Hermansson, Kersti (1)
van der Wijngaart, W ... (1)
Sjödahl, Johan (1)
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Kempka, Martin (1)
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Kungliga Tekniska Högskolan (2)
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Engelska (2)
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2005 (2)

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