In this treatment method laser radiation, which is guided from a co-axially expanding liquid jet-stream, locally initiates on a metal surface a thermochemical etching reaction, which leads to selective material removal. Time-resolved measurements of the electrical potential were correlated with the specific processing parameters to identify conditions for stable and enhanced chemical etching re...

This paper presents a novel fiber spraying process for the manufacturing of short bundle-reinforced Nextel™ 610/Al2O3-ZrO2 oxide composites (SF-OFC) and its characterization. First, influence varying lengths (7, 14, 28 mm, continuous fibers) orientations (unidirectional 0°, quasi-isotropic, ±45°) was investigated using hand-laid SF-OFC. Due to weak matrix, material exhibited strongly fiber-domi...

The change of signature of a metric is explained using simple examples and methods. The Klein-Gordon field on a signature-changing background is discussed, and it is shown how the approach of Dray et al. can be corrected to ensure that the KleinGordon equation holds. Isotropic cosmologies are discussed, and it is shown how the approach of Ellis et al. can be corrected to ensure that the Einstei...

The reflection and transmission of thermoelastic plane waves at an imperfect boundary of two dissimilar fibre-reinforced transversely isotropic thermoelastic solid half-spaces under hydrostatic initial stress has been investigated. The appropriate boundary conditions are applied at the interface to obtain the reflection and transmission coefficients of various reflected and transmitted waves wi...

X iv :s ol vin t/9 81 20 31 v1 2 9 D ec 1 99 8 Twoand Many-Dimensional Quasi-Exactly Solvable Models With An Inhomogeneous Magnetic Field O. B. Zaslavskii Department of Physics, Kharkov State University, Svobody Sq.4, Kharkov 310077, Ukraine E-mail: [email protected] Let group generators having finite-dimensional representation be realized as Hermitian linear differential operators without inhomo...

We consider graded representations of the algebra NC of noncommutative symmetric functions on the Z-linear span of a graded poset P . The matrix coefficients of such a representation give a Hopf morphism from a Hopf algebra HP generated by the intervals of P to the Hopf algebra of quasi-symmetric functions. This provides a unified construction of quasi-symmetric generating functions from differ...