Vitamin D3 is produced in the skin in response to UVB irradiation, from either sun exposure or UVB sunbeds. The objective of the current study was to characterize serum 25(OH)D response to regular sunbed use from several lamp outputs following their respective time exposure recommendations. There were three groups that tanned over 12 weeks during the winter months in dedicated sunbeds based on ...

We sought to describe cerebrovascular responses to incremental exercise and test the hypothesis that changes in cerebral oxygenation influence maximal performance. Eleven men cycled in three conditions: 1) sea level (SL); 2) acute hypoxia [AH; hypobaric chamber, inspired Po(2) (Pi(O(2))) 86 Torr]; and 3) chronic hypoxia [CH; 4,300 m, Pi(O(2)) 86 Torr]. At maximal work rate (W(max)), fraction of...

Enhanced resistive memory characteristics with 10,000 consecutive direct current switching cycles, long read pulse endurance of >10 cycles, and good data retention of >10 s with a good resistance ratio of >10 at 85°C are obtained using a Ti nanolayer to form a W/TiOx/TaOx/W structure under a low current operation of 80 μA, while few switching cycles are observed for W/TaOx/W structure under a h...

In this paper, we present an assessment of the blocking performance in wavelength routed chordal ring networks. The performance is focused on chord lengths of w = 3, w = N/4, and w = √ N + 3, being N the number of nodes. It is shown that, in a 100-node chordal ring network, the use of the chord length of w = N/4 instead of w = 3 clearly reduces the blocking probability. A reduction of the block...

Abstract Dense (Hf, Ta, Nb, Ti, V)C- and (Ta, V, W)C-based high-entropy carbides (HEC) were produced by three different sintering techniques: gas pressure sintering/sinter–HIP at 1900 °C 100 bar Ar, vacuum 2250 0.001 as well SPS/FAST 2000 60 MPa pressure. The relative density varied from 97.9 to 100%, with SPS producing 100% dense samples both compositions. Grain size measurements showed that t...