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Institution

Brno University of Technology

EducationBrno, Czechia
About: Brno University of Technology is a education organization based out in Brno, Czechia. It is known for research contribution in the topics: Fracture mechanics & Filter (video). The organization has 6339 authors who have published 15226 publications receiving 194088 citations. The organization is also known as: Vysoké učení technické v Brně & BUT.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors used observations at X-ray, UV, optical, and radio wavelengths to infer the properties of two large stellar flares from a nearby young M dwarf binary DG CVn.
Abstract: On 2014 April 23, the Swift satellite responded to a hard X-ray transient detected by its Burst Alert Telescope, which turned out to be a stellar flare from a nearby, young M dwarf binary DG CVn. We utilize observations at X-ray, UV, optical, and radio wavelengths to infer the properties of two large flares. The X-ray spectrum of the primary outburst can be described over the 0.3–100 keV bandpass by either a single very high-temperature plasma or a nonthermal thick-target bremsstrahlung model, and we rule out the nonthermal model based on energetic grounds. The temperatures were the highest seen spectroscopically in a stellar flare, at T X of 290 MK. The first event was followed by a comparably energetic event almost a day later. We constrain the photospheric area involved in each of the two flares to be >1020 cm2, and find evidence from flux ratios in the second event of contributions to the white light flare emission in addition to the usual hot, T ~ 104 K blackbody emission seen in the impulsive phase of flares. The radiated energy in X-rays and white light reveal these events to be the two most energetic X-ray flares observed from an M dwarf, with X-ray radiated energies in the 0.3–10 keV bandpass of 4 × 1035 and 9 × 1035 erg, and optical flare energies at E V of 2.8 × 1034 and 5.2 × 1034 erg, respectively. The results presented here should be integrated into updated modeling of the astrophysical impact of large stellar flares on close-in exoplanetary atmospheres.

63 citations

Journal ArticleDOI
TL;DR: In this article, a hot-rolled steel I-beam subjected to lateral-torsional buckling due to bending moment is examined and a non-linear finite element model and numerical approximation and simulation methods used for the global sensitivity analysis of the static resistance of a beam under major axis bending.

63 citations

Journal ArticleDOI
TL;DR: A good and reliable comparison to those with nonlinear structures is provided, which helps the designers to consider whether to choose a nonlinear structure or not in a particular energy harvester based on different application scenarios.

63 citations

Journal ArticleDOI
TL;DR: Both methods were found to be suitable for the determination of the target analytes, although GC–MS was better suited to the quantitative determination of compounds present at low concentrations.
Abstract: Two methods were developed for the quantitative analysis of phenolic acids in herb extracts. The methods were based on liquid chromatography-time-of-flight mass spectrometry (LC-TOFMS) and gas chromatography-mass spectrometry (GC-MS). The methods were compared in terms of their linearity, repeatability, selectivity, sensitivity and the speed of the analysis. The sensitivity was good for both methods, with limits of detection of <80 ng/ml for most of the compounds. The relative standard deviations (RSD) of the peak areas were on average 7.2% for the LC-TOFMS method and 1.4% for the GC-MS method. Both methods were found to be suitable for the determination of the target analytes, although GC-MS was better suited to the quantitative determination of compounds present at low concentrations.

63 citations

Journal ArticleDOI
TL;DR: In this article, a 2D contour integral-equation method for the frequency-domain analysis of arbitrarily shaped power bus structures is presented, which allows the rapid and accurate computation of the frequencydependent transfer parameters between an arbitrary number of ports, as required for embedding the power plane structure into network simulation.
Abstract: A 2-D contour integral-equation method for the frequency-domain analysis of arbitrarily shaped power bus structures is presented. The numerically efficient approach allows the rapid and accurate computation of the frequency-dependent transfer parameters between an arbitrary number of ports, as required for embedding the power plane structure into network simulation. A formulation is developed for calculating the voltage distribution between the planes, as well as for determining the resulting radiated fields based on the field-equivalence principle. The method is applied for several test boards including a populated board with a surface-mount decoupling-capacitor network. The suggested approach is well confirmed by an analytical solution for the rectangular structure, by measurement and 3-D full-wave simulation results.

63 citations


Authors

Showing all 6383 results

NameH-indexPapersCitations
Georg Kresse111430244729
Patrik Schmuki10976352669
Michael Schmid8871530874
Robert M. Malina8869138277
Jiří Jaromír Klemeš6456514892
Alessandro Piccolo6228414332
René Kizek6167216554
George Danezis5920911516
Stevo Stević583749832
Edvin Lundgren5728610158
Franz Halberg5575015400
Vojtech Adam5561114442
Lukas Burget5325221375
Jan Cermak532389563
Hynek Hermansky5131714372
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202328
2022106
20211,053
20201,010
20191,214
20181,131