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The impedance function of concrete is considered and multiply subtractive Kramers-Kronig relations and sum rules are given for the impedance function. It is proposed that multiply subtractive Kramers-Kronig relations Nike Free 3.0 V5 provide better convergence, and Nike Free 5.0 V4 Canada thus increase the reliability of numerical analysis of impedance of concrete than the conventional Kramers-Kronig relations.
A Fizeau interferometer-based set-up for measurement of surface figure of plane optical surfaces has been discussed. Phase-shifting interferometry has been applied using wedge phase shifter. Technique for elimination of system aberrations has been described. Results are shown for a plane surface.
The article proposes a reorientation of the e-government maturity models by focusing IT applications to improve the core activities and bring end-users as the key stakeholders for future e-government investments. The proposed Public Sector Process Rebuilding (PPR) maturity model is an extension of the Layne and Lee model.
The problem of propagation of three-dimensional seismic wave fields from a spatially distributed source is considered. The solution in the spectral domain (ω, k) is obtained in the form of single integrals over the depth z for a homogeneous isotropically porous half-space in the case of an ellipsoidal radiating object.