Wafer-type PZT transducers are very effective as active sensors for Lamb wave studies in elastic plates and in steel bridge girders. It has been demonstrated that a single transducer can be used in pulse-echo mode, transmitting a transient waveform and then detecting return signals echoing from boundaries, irregularities, and flaws such as cracks. We describe here an inductively-coupled system ...

Wafer-type PZT transducers are very effective as active sensors for Lamb wave studies in elastic plates and in steel bridge girders. It has been demonstrated that a single transducer can be used in pulse-echo mode, transmitting a transient waveform and then detecting return signals echoing from boundaries, irregularities, and flaws such as cracks. We describe here an inductively-coupled system ...

This paper shows a multidisciplinary approach to heritage documentation involving Close Range Photogrammetry and Ground Penetrating Radar techniques, as well as the development of finite elements based structural models. The geometric shape, the building material homogeneity and the current damages and its causes are obtained. The usefulness of Close Range Photogrammetry in the accurate 3D mode...

Structural deterioration is becoming a major problem when considering long term performance of infrastructures. The existence of a corrosive environment, cyclic loading and concrete cracking cause structural strength degradation. The interaction of these conditions can only be taken into account when modeling the coupled action. In this paper, a new model to assess lifetime of RC structures sub...

The daily traffic on bridges, the moisture of the atmosphere and the tiredness of materials, cause damages even the collapse of these works, if there is not a policy of maintenance and maintenance allowing the detection of possible defects in these structures and the intervention in the convenient period. These degradations can be cracks types (longitudinal or transverse), vacuums, corrosion or...

OBJECTIVE The objective of our study is to analyse (with the help of scanning electron microscopes) the quality of the dental root surface and the appearance of dental cracks after performing apical preparations using two different types of ultrasonic tips. STUDY DESIGN We used 32 single-rooted teeth that underwent a root canal and apical resection. Afterwards, the teeth were divided into 4 g...

where 0 < ε < 1, and the unknown function g satisfies the boundary conditions g(±1) = 0. The integral has to be understood as the finite part of the strongly singular integral in the sense of Hadamard, who introduced this concept in relation to the Cauchy principal value. In fact, the toughness of brittle solids such as ceramics and cement-like materials can be increased considerably by the use...

On Intel Sandy Bridge processor, last level cache (LLC) is divided into cache slices and all physical addresses are distributed across the cache slices using an hash function. With this undocumented hash function existing, it is impossible to implement cache partition based on page coloring. This article cracks the hash functions on two types of Intel Sandy processors by converting the problem ...