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Dielectric permittivity governs the propagation of electromagnetic waves in materials with low electrical conductivity, as it is the case of wood. This fact makes ground-penetrating radar (GPR) a potential technique for the nondestructive testing of timber. In addition, working with the direct wave has great advantages to physically characterize building materials. In particular, this study analyses...
The durability of concrete structures depends mainly on the ease with which the water and aggressive chemical agents dissolved therein penetrate it. Moreover, the electromagnetic waves emitted by Ground-penetrating radar (GPR) are very sensitive to the water content of the medium through which they propagate. For all this, the present experimental study analyzed the sensitivity of GPR to assess the...
The dielectric response of timber to electrical fields is influenced by many factors, one of the most important being the internal structure of the wood. Thus the anisotropy of the wood should be taken into account when the ground-penetrating radar (GPR) technique is used to explore the properties of timber. The work carried out analyzes, by means of a GPR with a 1.6 GHz antenna, the dielectric behavior...
An integrated front-end architecture for in-vivo detection is presented. The system is conceived to be implanted under the human skin. The powering and communication between this device and an external primary transmitter are based on an inductive link. The presented architecture is oriented to two different approaches, defining a true/false alarm system, based on amperometric or impedance biosensors...
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