Three-wavelength SPAD-based photoplethysmography

Continuous and real-time monitoring of cardiorespiratory signals by portable and accurate instrumentation is very important for the early diagnosis of cardiovascular diseases. We aim to present a novel photoplethysmography device to assess changes in blood oxygen saturation and beat-bybeat pulse waves of finger blood volumes not affected by possibly occurring variations in oxygen saturation. For this purpose, our device works at three light wavelengths simultaneously and is based on a Single-...

Complexity in Heart Rate Variability after Postural Sympathovagal Change by Sample, Fuzzy, and Distribution Entropy

Distribution Entropy (DistEn) has been proposed to quantify the heart rate variability (HRV) complexity as an alternative to Sample (SampEn) or Fuzzy (FuzzyEn) entropies, which essentially measure the HRV randomness. We aim to evaluate if postural sympathovagal activations in healthy individuals induce changes in HRV complexity or randomness by jointly estimating DistEn, SampEn, and FuzzyEn. We compared the estimators on white, pink, and random noises, and on chaotic and periodic series. Then...

I pagamenti per servizi ecosistemici. Un’analisi di diritto comparato

Il giudizio di bellezza delle dee nel Dionisalessandro di Cratino (POxy 663, col. I rr. 12–19)

This paper focuses on the lines 12-19 of the Hypothesis to Cratinus’ Dionysalexandros (POxy 663), which summarize the so-called scene of the beauty contest between the goddesses Hera, Athena and Aphrodite; since the first publication of the papyrus in 1904, the problems concerning both text and scene were strongly debated. The paper discusses the interpretation of the text and proposes a reconstruction of the scene based on a possible parallel with Lucian’s dialogue Θεῶν κρίσις (XXXV MacLeod).