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Simultaneous microwave and ultrasound irradiation is shown as a new technique for digestion of solid and liquid samples suitable for chemical and food analysis. Its application in analytical chemistry has been shown by decreases in digestion time: determination of copper in edible oils and total Kjeldahl nitrogen. 相似文献
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We describe in this paper a design procedure for omnidirectional high reflectors with wide bandwidths for optical telecommunication
bands. From the numerical results achieved by the transfer matrix method, it is found that a partial omnidirectional high-reflector
covering the optical telecommunication wavelengths 1.3 and 1.55 μm is obtained for a partially deformed quarter-wave stack
air/H(LH)15/glass by using the tellurium as a material of high refractive index (n
H = 4.6). The partially deformed stack is a periodic system deformed by a power law y = x
1+k. Here y is the coordinates of the deformed object, x is the coordinates of the periodic stack and k is the coefficient defining the deformation degree. The study of this system leads to an omnidirectional high reflector band
covering the optical telecommunication wavelengths 1.3 and 1.55 μm for k = 0.2. 相似文献
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Jihene Lagha 《Applicable analysis》2018,97(6):865-887
We rigorously derive an asymptotic expansion for two-dimensional displacement field associated with thin elastic inclusion having no uniform thickness. Our approach is based on layer potential techniques through integral representation formulas of the fields. We extend these techniques to determine a relationship between traction–displacement measurements and the shape of the thin inclusion. 相似文献
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M. Lagha P. Manneville 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(4):433-447
The Galerkin method is used to derive a realistic model of
plane Couette flow in terms of partial differential equations governing
the space-time dependence of the amplitude of a few cross-stream modes.
Numerical simulations show that it reproduces the globally sub-critical
behavior typical of this flow. In particular, the statistics of turbulent
transients at decay from turbulent to laminar flow displays striking
similarities with experimental findings. 相似文献
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Jihene Lagha Faouzi Triki Habib Zribi 《Mathematical Methods in the Applied Sciences》2017,40(10):3608-3636
We consider the Lamé system for an elastic medium consisting of an inclusion embedded in a homogeneous background medium. Based on the field expansion method and layer potential techniques, we rigorously derived the asymptotic expansion of the perturbed displacement field because of small perturbations in the interface of the inclusion. We extend these techniques to determine a relationship between traction‐displacement measurements and the shape of the object and derive an asymptotic expansion for the perturbation in the elastic moment tensors because of the presence of small changes in the interface of the inclusion. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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