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We introduce a new q-exponential/logarithm correspondance that allows us to solve a conjecture relating Zassenhauss Lie idempotents with other Lie idempotents related to the q-bracketing operator.

- G'erard H.E. Duchamp, F. J.-M. Verdier, Bruno Levrier, François Marc, Yves Ousten, Yves Danto
- Proceedings of the 12th International Symposium…
- 2005

In this paper, we investigate a second-category method to evaluate the degradations of high frequency interconnections on FR4 boards. More than the defects location, the purpose of the present study is to distinguish the effects of the copper metallization corrosion (oxidation, delamination, etc..) from the /spl epsiv//spl tau/ sensitivity to moisture… (More)

- Hassene Fridhi, G'erard H.E. Duchamp, Valerie Vigneras, Alexandrine Guédon-Gracia, J. Y. Deletage, Hélène Frémont
- 2012 13th International Thermal, Mechanical and…
- 2012

In this paper the effect of humidity aging on the electromagnetic radiation behavior of a printed circuit board is presented. Experimental study of the aging effect on the losses in electromagnetic radiation of the test structure was performed using a near field test bench. The samples were aged at various levels of temperature and aging times were used to… (More)

Computations with integro-differential operators are often carried out in an associative algebra with unit and they are essentially non-commutative computations. By adjoining a cocommutative co-product, one can have those operators perform on a bialgebra isomorphic to an enveloping algebra. That gives an adequate framework for a computer-algebra… (More)

The Riordan group is the semi-direct product of a multiplicative group of invertible series and a group, under substitution, of non units. The Riordan near algebra, as introduced in this paper, is the Cartesian product of the algebra of formal power series and its principal ideal of non units, equipped with a product that extends the multiplication of the… (More)

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