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Sökning: WFRF:(Crowley J) > Konferensbidrag

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  • Slama, J, et al. (författare)
  • Plešovice zircon – A new natural standard for U-Pb and Hf isotopic microanalysis
  • 2007
  • Ingår i: Goldschmidt Conference Abstracts.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Increasing number of geological applications requires theuse of well-characterized and widely available referencematerials for in situ analysis. We have established a newnatural zircon standard (“Plešovice”) for U-Pb dating and Hfisotopic analysis by laser ablation ICP-MS.The ID-TIMS U-Pb age of the Plešovice zircon has beendetermined to 336.9±0.2 Ma (95% confidence limits; mean206Pb/238U age). The U-Pb ages obtained by LA ICP-MS (3labs) and SIMS techniques show larger spread but within theiranalytical uncertainties they are consistent with the TIMS age.Hafnium isotopic composition of the Plešovice zircon appearsto be homogenous within and between grains. Combined laserablation and solution MC ICP-MS analyses gave a mean176Hf/177Hf value of 0.282481±0.000013 (95% confidencelimits, 87 analyses). Cathodoluminescence and BSE imagingand chemical analyses revealed that discrete zones in thePlešovice zircon are enriched in trace elements and especiallyin U and Th. Raman spectroscopy suggests that these highlyradiation-damaged areas have not undergone any annealing.Our LA ICP-MS analyses did not indicate any Pb-loss but thehigh intensities of measured U signal require that these areasare avoided during routine U-Pb isotopic analysis.
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  • Bergenstråhle, Malin, et al. (författare)
  • Cellulose crystal structure and force fields
  • 2010
  • Ingår i: International Conference on Nanotechnology for the Forest Products Industry 2010. - 9781618390011 ; , s. 674-689
  • Konferensbidrag (refereegranskat)abstract
    • Classical molecular mechanics force fields for carbohydrates are widely used for molecular dynamics simulations of crystalline cellulose, in particular, cellulose Iβ. To investigate the impact of choice of force field on crystalline cellulose structure and properties we have performed a comparative study of four different carbohydrate force fields. Molecular dynamics simulations applying the different force fields were performed on a solvated cellulose Iβ crystal. The crystal consisted of 36 cellulose chains, each of them 40 glucose units long, arranged in a crystal manner with a square cross section. These simulations show that the differences in force fields are of great importance for the resulting relaxed cellulose structure. The orientation of the hydroxymethyl groups is a key parameter and an indicator of different hydrogen bonding patterns that may be found in crystalline cellulose.
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  • Resultat 1-10 av 21

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