621 research outputs found
Permoridiidae Burckhardt & Nel & Raisch & Poschmann 2022, fam. nov.
No full textFamily Permoridiidae fam. nov. urn:lsid:zoobank.org:act:C6E7BB19-1626-4429-9C8CE85BA2FB9D44 Type genus: Permoridium gen. nov. Diagnosis As for the type genus, by present designation and monotypy. Genus Permoridium gen. nov. urn:lsid:zoobank.org:act:DCBE88A6-3413-4EB9-8126- 1ABF8E088433 Type species: Permoridium fresenaci sp. nov., by present designation. Etymology Composed of the stem of ‘Perm-ian’ and the suffix of ‘Pelo-ridium’, referring to the age and putative phylogenetic relationship of the new genus, the Permian period and the genus Peloridium, respectively. Gender neuter. Diagnosis Forewing characters only. Vein M+CuA basally separated from R but appressed to it (main autapomorphy); ScA elongate, well separated from C, with posterior branches; ScP well separated from R and elongate, ending into RA in distal half of wing; stem of CuA weak; crossvein cua-cup strong and aligned with distal part of CuA; CuP weak, closely parallel to cua-cup, distal part of CuA and PCu.Published as part of Burckhardt, Daniel, Nel, André, Raisch, Manfred & Poschmann, Markus J., 2022, A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha, pp. 1-6 in Historical Biology 7 (2) on page 3, DOI: 10.1080/08912963.2022.2067759, http://zenodo.org/record/774569
Voltage Stability and Reactive Power Sharing in Inverter-Based Microgrids with Consensus-Based Distributed Voltage Control
No full textWe propose a consensus-based distributed voltage control (DVC) that solves the problem of reactive power sharing in autonomous inverter-based microgrids with dominantly inductive power lines and arbitrary electrical topology. Opposed to other control strategies available thus far, the control presented here does guarantee a desired reactive power distribution in steady state while only requiring distributed communication among inverters, i.e., no central computing nor communication unit is needed. For inductive impedance loads and under the assumption of small phase angle differences between the output voltages of the inverters, we prove that the choice of the control parameters uniquely determines the corresponding equilibrium point of the closed-loop voltage and reactive power dynamics. In addition, for the case of uniform time constants of the power measurement filters, a necessary and sufficient condition for local exponential stability of that equilibrium point is given. The compatibility of the DVC with the usual frequency droop control for inverters is shown and the performance of the proposed DVC is compared with the usual voltage droop control via simulation of a microgrid based on the Conseil International des Grands Réseaux Electriques (CIGRE) benchmark medium voltage distribution network
A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha
No full textBurckhardt, Daniel, Nel, André, Raisch, Manfred, Poschmann, Markus J. (2022): A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha. Historical Biology 7 (2): 1-6, DOI: 10.1080/08912963.2022.2067759, URL: http://dx.doi.org/10.1080/08912963.2022.206775
The effect of using variable frequency trains during functional electrical stimulation cycling
No full textFigure 2 in A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha
No full textFigure 2. Permoridium fresenaci gen. et sp. nov., holotype UGKU 1096, photographs. (A) Part; (B) Counterpart. Scale bars = 5 mm.Published as part of Burckhardt, Daniel, Nel, André, Raisch, Manfred & Poschmann, Markus J., 2022, A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha, pp. 1-6 in Historical Biology 7 (2) on page 4, DOI: 10.1080/08912963.2022.2067759, http://zenodo.org/record/774569
The effect of variable frequency trains during FES cycling
No full textThe purpose of this paper is to investigate variable frequency stimulation patterns as a mean of increasing torque production and hence performance in FES cycling. Specific experiments were carried out on 6 healthy subjects using a motor to keep a constant cadence. We stimulated the quadricep muscle of both the legs and measured the torque produced at the crank. Three different patterns with the same number of stimulation pulses in the train and with an initial ramp modulation of the pulsewidth (PW) were compared: 1 constant frequency train (CFT) with an interpulse interval (IPI) of 50ms and 2 catchlike-inducing trains (CIT). The tested CIT had two different IPI of the remaining low-frequency part of the train (50ms and 55ms) and the doublet was always placed at the end of the PW ramp up.The results indicated that the CIT produced significantly greater torque time integrals and torque peaks than CFT both in fresh and fatigued muscles. In addition the CIT showed a lower reduction of the parameters tested between pre-fatigue and fatigue conditions.Our results suggest that stimulation with CIT increased the torque produced for each applied stimulation pulse improving the performance of FES cycling compared to CFT stimulation
Figure 1 in A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha
No full textFigure 1. Approximate geographical and stratigraphical position of the Grügelborn locality (marked by asterisk) with rough absolute ages indicated (slightly modified from Nel and Poschmann 2020).Published as part of Burckhardt, Daniel, Nel, André, Raisch, Manfred & Poschmann, Markus J., 2022, A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha, pp. 1-6 in Historical Biology 7 (2) on page 2, DOI: 10.1080/08912963.2022.2067759, http://zenodo.org/record/774569
Figure 3 in A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha
No full textFigure 3. Permoridium fresenaci gen. et sp. nov., holotype UGKU 1096, explanatory sketch drawing with venation labelled. Scale bar = 5 mm.Published as part of Burckhardt, Daniel, Nel, André, Raisch, Manfred & Poschmann, Markus J., 2022, A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha, pp. 1-6 in Historical Biology 7 (2) on page 4, DOI: 10.1080/08912963.2022.2067759, http://zenodo.org/record/774569
Figure 4. Peloridium hammoniorum Breddin 1897 in A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha
No full textFigure 4. Peloridium hammoniorum Breddin 1897, an extant moss bug for comparison. Parque Nacional de Chiloé, Rancho Grande, Chile (leg. D. Burckhardt). Photograph with wing venation labelled. Scale bar = 0.2 mm.Published as part of Burckhardt, Daniel, Nel, André, Raisch, Manfred & Poschmann, Markus J., 2022, A new putative moss bug (Insecta: Hemiptera) from the lower Permian of the Saar-Nahe Basin, SW Germany, and the age of Coleorrhyncha, pp. 1-6 in Historical Biology 7 (2) on page 5, DOI: 10.1080/08912963.2022.2067759, http://zenodo.org/record/774569
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