Reconstructing Haemodynamics Quantities of Interest from Doppler Ultrasound Imaging

The present contribution deals with the estimation of haemodynamics Quantities of Interest by exploiting Ultrasound Doppler measurements. A fast method is proposed, based on the PBDW method. Several methodological contributions are described: a sub-manifold partitioning is introduced to improve the reduced-order approximation, two different ways to estimate the pressure drop are compared, and an error estimation is derived. A test-case on a realistic common carotid geometry is presented, showing that the proposed approach is promising in view of realistic applications.Comment: arXiv admin note: text overlap with arXiv:1904.1336

Ancient DNA reveals admixture history and endogamy in the prehistoric Aegean (advance online)

The Neolithic and Bronze Ages were highly transformative periods forthe genetic history of Europe but for the Aegean—a region fundamentalto Europe’s prehistory—the biological dimensions of cultural transitionshave been elucidated only to a limited extent so far. We have analysed newlygenerated genome-wide data from 102 ancient individuals from Crete, theGreek mainland and the Aegean Islands, spanning from the Neolithic tothe Iron Age. We found that the early farmers from Crete shared the sameancestry as other contemporaneous Neolithic Aegeans. In contrast, the endof the Neolithic period and the following Early Bronze Age were marked by‘eastern’ gene flow, which was predominantly of Anatolian origin in Crete.Confirming previous findings for additional Central/Eastern Europeanancestry in the Greek mainland by the Middle Bronze Age, we additionallyshow that such genetic signatures appeared in Crete gradually from theseventeenth to twelfth centuries bc, a period when the influence of themainland over the island intensified. Biological and cultural connectednesswithin the Aegean is also supported by the finding of consanguineousendogamy practiced at high frequencies, unprecedented in the globalancient DNA record. Our results highlight the potential of archaeogenomicapproaches in the Aegean for unravelling the interplay of genetic admixture,marital and other cultural practice

Geophysical explorations of the classical coastal settlement of Lechaion, Peloponnese (Greece)

Digital ArchaeologyClassical & Mediterranean Archaeolog

Integrated-path multi-gas sensor using near-infrared diode lasers:An alternative to vehicle-driven point gas analyzer

Sensors for quantitative monitoring of greenhouse gases from high-emission facilities, such as wastewater treatment and industrial plants, are becoming essential to enforce regulatory compliance in climate action initiatives. A predominant sensing technique is the tracer-gas dispersion method (TDM) using closed-path gas analyzers typically installed in a vehicle to measure concentration as the gas plume is transected. Here, we validate for the first time the use of integrated-path gas sensors in TDM, measuring instantaneously the concentration along a predetermined laser beam path, thereby facilitating a stationary setup with orders of magnitude higher update rate and without the need for vehicles or road access. Our approach relies on a sensitive, integrated-path multi-gas sensor for real-time emission quantification using tunable diode laser absorption spectroscopy. An optical sensor head with spectral coverage from 1.52 μm to 1.65 μm is demonstrated, supporting multiplexed gas sensing in a modular fashion using low-power fiber-coupled diode lasers. The sensor measures real-time integrated-path concentrations of CO2 and CH4, and the tracer-gas C2H2 at 130 Hz with 0.5 ppm, 3 ppb, and 2 ppb sensitivity, respectively, at 1 s averaging. The integrated-path sensor is systematically benchmarked for absolute accuracy against a state-of-the-art point sensor, revealing an excellent match over 16 hours. Furthermore, the integrated-path sensor is deployed outdoors for emission quantification using TDM. A comparison to the gold-standard point sensor reveals identical results, demonstrating the integrated-path sensor as a potent substitute for vehicle-driven point sensors