Improved Permittivity Calibration Method for Wideband In Situ Permittivity Probe
This letter discusses about an improved permittivity probe calibration method for calculating the complex permittivity of soils from reflection data over a very wide bandwidth. The accuracy of this method is demonstrated using reflection data collected from a unique wideband (10-1000 MHz) permittivity probe specifically designed for quick in situ permittivity measurements of soils at different depths. The improved calibration method is based on the traditional capacitance model, which suffers from errors caused by the assumption that the capacitance is independent of the frequency and the permittivity of the ambient medium under test. The improved capacitance model is introduced here to account for the frequency- and permittivity-dependent effects. Thus, it produces more accurate permittivity estimation over a much wider frequency and permittivity ranges. This letter will discuss about the accuracy of this improved permittivity probe calibration method and a wideband in situ soil probe design.
Nonsmooth analysis of the pulse pressured infusion fluid flow
This work deals with forced oscillations of fluid flows generated by infusive pump connected to a human ventricular artery. Response curves are obtained and the nonlinearity is investigated for various geometrical conditions, excitation amplitudes, and periodic conditions. The nonlinearity related to the energy losses has been taken into considerations. An overall model for the study of an isothermal fluid flow across a highly incompressible medium is proposed. The main difficulty being that the infusion fluid flow results from a pressure prescribed over the venous artery involving impact boundary conditions. The proposed solution has been constructed by taking into account the interactions between all the solid and fluid components directly in mass balance and energy conservation equations. Applications of nonsmooth time transformations and introducing a unified physical basis for analyses of infusive fluid flow with essentially nonharmonic, and discontinuous time shapes revealed explicit links between impact dynamics and hyperbolic (complex) algebras analogously to the link between harmonic oscillations and conventional complex analyses. This study also deals with the coupling condition between the barrel fluid region and venous instantaneous states. This appears as prime importance for a global model of infusion processes.
Resonant Auger decay study of C1s -> pi* core-excited OCS
The present work aims at characterizing short-lived C1s((-1)) pi*((1)) core-excited states of the OCS molecule based on the analysis of the vibrational fine structure and lineshape profiles of the high-resolution resonant Auger decay spectra recorded at the excitation energies along the C1s -> pi* resonance in the binding energy region 15-19eV. Very different behavior in terms of lineshape and resonant enhancement is observed for the (A) over tilde, (B) over tilde and (C) over tilde final states. This is explained by (1) the variation in the C-O bond lengths for the states involved in the electronic relaxation and (2) different contributions in terms of Mulliken population to the molecular orbitals determining the electronic character of the corresponding states. Since the final-state geometries are known from a number of previous experiments and ab initio calculations, the geometry of the C1s((-1)) pi*((1)) intermediate states can be predicted in analogy with e.g. the N-2, CO2 and N2O molecules. (C) 2009 Elsevier B.V. All rights reserved. (Less)