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1. Introduction Heart disease poses a significant global public health challenge and stands as the primary cause of death worldwide, particularly prevalent in large urban populations. The World Health Organization reported 17.3 million deaths attributable to heart disease in 2012, a number projected to escalate to 23.6 million by 2030 [1]. The escalating mortality rates underscore the imperative focus on preventing cardiovascular diseases and early diagnosis within contemporary cardiology.
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by , *, and Department of Information Engineering, Electronics and Telecommunication, Sapienza University of Rome, 00184 Rome, Italy * Author to whom correspondence should be addressed.
Open AccessArticle by Marco Scarpetta 1, Andrea Cataldo 2, Maurizio Spadavecchia 1,*, Emanuele Piuzzi 3, Antonio Masciullo 2 and Nicola Giaquinto 1,* 1 Department of Electrical and Information Engineering, Polytechnic University of Bari, Via E.
3.2. WR90 Results found by using the WR90 waveguide system ( 8.2 − 12.4 GHz span ) on reference neat matrix and PA6/GNPs samples are shown in Figure 7 and Figure 8. For the relative permittivity of the PA6 (Figure 7) an average value of ε′ = 2.999 with a standard deviation equal to σε = 0.0059 were found. These values can be compared with ones obtained in [50], but considering that in that case the value is measured slightly above the bandwidth considered in this paper.
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