نتایج جستجو برای: spectrum b
تعداد نتایج: 1104723 فیلتر نتایج به سال:
use of raman spectroscopy to decrease time for identifying the species of candida growth in cultures
background: the objective of this study is to establish raman signatures from pure cultures of different candida species using raman spectroscopy (rs) and use these signatures for rapid identification of unknown candida species. methods: pure cultures of five candida species were evaluated using rs to build a limited signature library. ‘raman processing’ (rp) software was used for principal com...
This is the first report of the use of a hand-held 1064 nm Raman spectrometer combined with red-shifted surface-enhanced Raman scattering (SERS) nanotags to provide an unprecedented performance in the short-wave infrared (SWIR) region. A library consisting of 17 chalcogenopyrylium nanotags produce extraordinary SERS responses with femtomolar detection limits being obtained using the portable in...
A precise determination of |Vub| can be obtained exploiting the sum rule for inclusive charmless semileptonic B-meson decays. The sum rule is derived on the basis of light-cone expansion and b-flavored quantum number conservation. The sum rule does not receive any perturbative QCD correction. In this determination of |Vub|, there is no perturbative QCD uncertainty, while the dominant hadronic u...
Following a strategy introduced earlier by the authors, we show that it is possible to extract |Vub| from the cut hadronic mass spectrum of B decays without large systematic errors which usually arise from having to model the Fermi motion of the heavy quark. We present a closed form expression for |Vub|/|Vts| which is accurate up to corrections of order α 2 s, αsρ, (Λ/mb) 2/ρ, where ρ is the ex...
The moments of the photon spectrum in the inclusive B → Xs γ decay can be calculated to order αs accuracy at present, without knowing the αs corrections to the effective Hamiltonian. We discuss the standard model predictions, and how the moments of the photon spectrum are related to certain matrix elements of the heavy quark effective theory. The sensitivity of these moments to new physics is s...
We have measured the branching fraction and photon energy spectrum for the radiative penguin process b → sγ. We find B(b → sγ) = (3.21 ± 0.43 ± 0.27 −0.10) × 10 , where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, 〈Eγ〉 = 2.346± 0.032± 0.011 GeV, and 〈E γ〉−〈Eγ〉 2 = 0.0226±0.0066±0.0020 GeV, wh...
This paper describes results of magnetic field measurements of white dwarfs carried out on the 6–m telescope for the last years. A magnetic field of about Be ≈ 28 kG has been discovered in the degenerate star WD1953–011 which has been selected from high–resolution spectroscopy of non–LTE Hα core by Koester et al. (1998). A rotational period of WD0009+501, 1.83 hours, has been discovered, the av...
We show a converse of a theorem of Ein, Lazarsfeld, Smith, and Varolin on the relation between the jumping coefficients and the roots of the Bernstein-Sato polynomial under certain hypotheses without which the assertion does not hold. For an explicit calculation we prove a formula for the multiplier ideals of stratified locally conical divisors, generalizing a formula of Mustata for a hyperplan...
We show a converse of a theorem of Ein, Lazarsfeld, Smith, and Varolin on the relation between the jumping coefficients and the roots of the b-function (i.e. the BernsteinSato polynomial) under certain hypotheses without which the assertion does not hold. For an explicit calculation we prove a formula for the multiplier ideals of stratified locally conical divisors, generalizing a formula of Mu...
This paper investigates the algorithmic dimension spectra of lines in the Euclidean plane. Given any line L with slope a and vertical intercept b, the dimension spectrum sp(L) is the set of all effective Hausdorff dimensions of individual points on L. We draw on Kolmogorov complexity and geometrical arguments to show that if the effective Hausdorff dimension dim(a, b) is equal to the effective ...
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