Fully noncontact inspection of closed surface crack with nonlinear laser ultrasonic testing method.
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DOI: 10.1016/j.ultras.2021.106426
Abstract: Nonlinear ultrasonic testing method is one of few techniques that are effective for evaluating early material degradation and micro-crack initiation by analysing the nonlinear effects of ultrasonic waves. This study presents a noncontact nonlinear ultrasonic… read more here.
Keywords: ultrasonic testing; testing method; closed surface; method ... See more keywords
INTEGRAL GRADIENT ESTIMATES ON A CLOSED SURFACE
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DOI: 10.4153/s0008439525101306
Abstract: Let $(\Sigma, g)$ be a closed Riemann surface, and let $u$ be a weak solution to equation \[ - \Delta_g u = \mu, \] where $\mu$ is a signed Radon measure. We aim to establish… read more here.
Keywords: gradient estimates; integral gradient; estimates closed; surface ... See more keywords