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Harmonisation of Low-Density Lipoprotein Cholesterol Results Obtained with Different Direct Methods: A Study Based on an External Quality Assessment Program. [PDF]
J Clin MedĆwiklińska A, Fijałkowska A.
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Acta Crystallographica Section A Foundations and Advances, 2019
The standard method of joint probability distribution functions, so crucial for the development of direct methods, has been revisited and updated. It consists of three steps: identification of the reflections which may contribute to the estimation of a given structure invariant or seminvariant, calculation of the corresponding joint probability ...
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The standard method of joint probability distribution functions, so crucial for the development of direct methods, has been revisited and updated. It consists of three steps: identification of the reflections which may contribute to the estimation of a given structure invariant or seminvariant, calculation of the corresponding joint probability ...
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Direct methods in surface crystallography
Vacuum, 1988Inspired by the heavy atom technique used in X-ray diffraction, the inversion of the Tensor LEED method is used to obtain structure information directly from experimental IV spectra i.e. without the usual trial and error procedure. From a LEED calculation for a certain reference structure (‘heavy atom’), intensities for neighboured structures can be ...
, Pendry, , Heinz, , Oed
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Advances in Engineering Software, 1995
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jin, WG, Cheung, YK
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zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jin, WG, Cheung, YK
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Alternating Direction Implicit Methods
1962Publisher Summary Alternating direction implicit methods, or ADI methods as they are called for short, constitute powerful techniques for solving elliptic and parabolic partial difference equations. However, in contrast with systematic overrelaxation methods, their effectiveness is hard to explain rigorously with any generality.
Birkhoff, G., Varga, R. S., Young, David
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THE DIRECT METHOD, REDUCIBILITY
Mathematics of the USSR-Izvestiya, 1991Consider the linear system (*) \(dx/dt=\lambda P(t)x\) where \(P\) is a quasi-periodic matrix with the frequency basis \(\alpha\) and 1 (\(\alpha\) is an irrational number), \(\lambda\) is a complex parameter. Let \(\alpha=p_ k/q_ k+(-1)^ k/)q_ kq_{k+1})+(- 1)^{k+1}/(q_{k+1}q_{k+2})+\cdots\).
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2007
Abstract The phase problem of crystallography was stated and defined in Section 5.8 and will be restated here for convenience: in order to determine the crystal structure we need both the magnitudes and phases of the structure factors, F (h), whereas only quantities related to their magnitudes are furnished by the experiment.
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Abstract The phase problem of crystallography was stated and defined in Section 5.8 and will be restated here for convenience: in order to determine the crystal structure we need both the magnitudes and phases of the structure factors, F (h), whereas only quantities related to their magnitudes are furnished by the experiment.
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