Cybercultures: Critical Concepts in Media and Cultural by David Bell

By David Bell

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The number of steps N is given by equation (2) and so the phase velocity is given by c(ω ) = vN 1 + ∞ 2ω 2 α N (Ω ) dΩ vN − 2 2 2 π 0 Ω (Ω − ω ) −1 . (15) The causal differential scattering approach 53 3 Numerical Implementation Four implementation issues present themselves: • the inaccuracies and numerical instabilities associated with the very large and very small parameter values • the singularity in the integrand of equation (14) and the associated Cauchy principal value • the infinite integral in equation (14) • the infinite summation in equation (9) To improve the accuracy and efficiency of the computations a re-scaling of the dimensions was implemented.

Ingress of water or other liquids, such as aviation fuels and solvents, generally leads to reduced strength but, again, it is difficult to monitor this reduction and whether or not it is acceptable, by present methods, without actually breaking the assembly. Contact between adhesive and substrate is readily verified, but actual mechanical strength is another story. We “adhesionists” hope that useful collaboration with “acousticians” will develop, both to improve the reliability of NDT in bonded systems, but also because there is some very interesting science in adhesive joints, and acoustics techniques should prove very powerful for a better understanding of this aspect.

The technique was applied to asymmetric wedge tests, the more flexible adherend corresponding to the rough optical surface [17]. Indeed, it was observed that the principal curvature of the flexed beam was associated with an orthogonal reverse curvature due to anticlastic bending. This, in turn, led to a curved crack front. Figure 5 [20] demonstrates the basic mechanics, assuming no adhesion strength. In fact, effects of adhesion strength moderate crack front curvature. R. Shanahan The interest of this anticlastic bending effect is not purely academic.

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