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High resolution studies using Fourier transform spectrometry of the spectra emitted in the visible and ultraviolet regions by a microwave boosted glow discharge source have shown that when the source is operated in the dc (unboosted) mode, two anomalous forms of line profile occur for some analyte elements. (1) Some Fe I lines appear to have a triangular base of half-width about five times greater than that of the line proper. (2) Some Fe II and Ti II lines exhibit satellites about 8 cm(-1) wide and an intensity of up to 2% of the peak value on either side of the main line. Both effects depend on the carrier gas and its pressure and are much less pronounced or even absent in the boosted mode. They could both affect the accuracy of analytical results, particularly for depth-profiling. Further studies are in progress. 相似文献
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Tino Zaehle Pascale Sandmann Jeremy D Thorne Lutz Jäncke Christoph S Herrmann 《BMC neuroscience》2011,12(1):2
Background
Transcranial direct current stimulation (tDCS) is a technique that can systematically modify behaviour by inducing changes in the underlying brain function. In order to better understand the neuromodulatory effect of tDCS, the present study examined the impact of tDCS on performance in a working memory (WM) task and its underlying neural activity. In two experimental sessions, participants performed a letter two-back WM task after sham and either anodal or cathodal tDCS over the left dorsolateral prefrontal cortex (DLPFC). 相似文献7.
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A.D. Martin R.G. Roberts W.J. Stirling R.S. Thorne 《The European Physical Journal C - Particles and Fields》2003,28(4):455-473
We determine the uncertainties on observables arising from the errors on the experimental data that are fitted in the global
MRST2001 parton analysis. By diagonalizing the error matrix we produce sets of partons suitable for use within the framework
of linear propagation of errors, which is the most convenient method for calculating the uncertainties. Despite the potential
limitations of this approach we find that it can be made to work well in practice. This is confirmed by our alternative approach
of using the more rigorous Lagrange multiplier method to determine the errors on physical quantities directly. As particular
examples we determine the uncertainties on the predictions of the charged-current deep-inelastic structure functions, on the
cross-sections for W production and for Higgs boson production via gluon-gluon fusion at the Tevatron and the LHC, on the ratio of W- to W+ production at the LHC and on the moments of the non-singlet quark distributions. We discuss the corresponding uncertainties
on the parton distributions in the relevant x,Q2 domains. Finally, we briefly look at uncertainties related to the fit procedure, stressing their importance and using , and extractions of as examples. As a by-product of this last point we present a slightly updated set of parton distributions, MRST2002.
Received: 13 November 2002 / Published online: 5 May 2003
RID="a"
ID="a" Royal Society University Research Fellow 相似文献
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Microgel applications and commercial considerations 总被引:3,自引:0,他引:3
Joanna B. Thorne George J. Vine Martin J. Snowden 《Colloid and polymer science》2011,289(5-6):625-646
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Publications mathématiques de l'IHÉS - We show that stationary characters on irreducible lattices $\Gamma < G$ of higher-rank connected semisimple Lie groups are conjugation... 相似文献