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In this paper, an approach based on the field equivalence principle for obtaining the information of the incident field from total field data is presented. In general, the incident field is not easy to know because it is related to not only the impressed source but also the characteristics of the transmitting antenna and the surrounding environment of the source. By using this approach, the incident...
In the last few years, the possibility to engineer the properties of artificial Metamaterials at microwave, THz, and optical frequencies has represented one of the key factors enabling the study, development, and demonstration of effective electromagnetic cloaks [1]. Indeed, several devices have been proposed which are able to manipulate the wave propagation not only to reduce radar cross section,...
The capability to describe, design, and configure complex devices on a multi-scale basis (e.g., combining their descriptors on a macro-scale, such as the device geometry, and on a micro/nano-scale, such as on the constituting material features) is a very important task in those applicative scenarios where the features of the overall systems can be obtained only as combination of information obtained...
There is nowadays an increasing attention and request towards the study and development of systems and techniques for increasing the human safety and security in all aspects of the everyday life. In this framework, the possibility to perform a non-invasive inspection of structures or objects by means of non-destructive testing and evaluation (NDT-NDE) technologies is of particular interests in several...
Imaging techniques exploiting sparseness-regularized formulations emerged in the last few years as powerful and effective retrieval methods in several heterogeneous scenarios [1] including structural monitoring, non-destructive testing and evaluation, ground penetrating radar imaging, and biomedical diagnosis [2–8]. The success of the this class of algorithms, which are often collectively indicated...
Most inversion schemes for reconstructing electrical parameter distributions of unknown objects assume the explicit knowledge of incident fields illuminating them. We have proposed an inversion approach based on the field equivalence principle without requiring the knowledge of incident fields. The approach, however, requires measurement of both electric and magnetic tangential components of total...
A piezoelectric system of (1−x)Bi(Ni1/2Ti1/2)O3–x(Pb(1−y)SryTiO3) (BNT–PST) is developed to have good high temperature piezoelectric properties with much improved resistivity. The crystal structure shows that the phase transformation from tetragonal phase to rhombohedral one is gradually shifted to the composition with high content of PT by the substitution of strontium. The problem of leakage current...
Throughout our research about lead-free piezoelectric ceramics, we have found that some of lead-free ferroelectric ceramics indicate the excellent piezoelectric properties as compared with PZT-based ceramics under some specific conditions such as high temperature, large amplitude vibration or large mechanical stress. Bismuth layer-structured ferroelectric ceramic, Bi4Ti3O12 (BIT), has high Curie temperature,...
In this paper an antenna array for imaging applications is presented. A two-step design process is used. In the first step, a wideband printed monopole antenna to be employed as the array element is synthesized by means of a Particle Swarm Optimization (PSO) procedure. The second step is aimed at obtaining an array fulfilling the requirements typical of imaging applications by properly arrange multiple...
Aims/hypothesis We examined the link between altered gap junctional communication and renal haemodynamic abnormalities in diabetes in studies performed on Zucker lean (ZL) and the Zucker diabetic fatty (ZDF) rat model of type 2 diabetes. Methods The abundance of connexin (Cx) 37, 40 and 43 was assessed by western blot and immunohistochemistry. Renal haemodynamics was characterised with GAP peptides,...
This paper presents a novel technique for multi-hop localization by using mobility (MLM) in mixed line-of-sight/non-line-of-sight (LOS/NLOS) environments. In MLM, nodes equipped with ultra-wideband (UWB) radio first move randomly for collecting time-of-arrival (TOA) measurements and then apply a modified biased Kalman filter (MBKF) designed for mitigating NLOS errors. NLOS bias in the measurements...
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