https://puma.ub.uni-stuttgart.de/group/simtech/surfacePUMA RSS feed for /group/simtech/surface2026-04-23T07:45:54+02:00https://puma.ub.uni-stuttgart.de/bibtex/288f633199ed2d6814a99626939d3d01b/inspo5inspo52022-07-19T11:10:29+02:00surface isometric voluntary maximal muscles s electromyography PFM pelvic MVC contraction floor EMG <span data-person-type="editor" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="editor"><a title="Tobias Siebert" itemprop="url" href="/person/1daa15e055c72f0862fdcf0dab766cd8b/editor/0"><span itemprop="name">T. Siebert</span></a></span></span> (Eds.) </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">Wiley Online Library Neurourology and Urodynamics</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">39 </span></span>(<span itemprop="issueNumber">1</span>): <span itemprop="pagination">271-278</span></em> </span>(<em><span>October 2020<meta content="October 2020" itemprop="datePublished"/></span></em>)</span>Tue Jul 19 11:10:29 CEST 2022Wiley Online Library Neurourology and Urodynamics101271-278Intraday and interday reliability of pelvic floor muscles electromyography in continent woman. Neurourol Urodyn 392020surface isometric voluntary maximal muscles s electromyography PFM pelvic MVC contraction floor EMG Aims Vaginal surface electromyography (sEMG) is a tool used for the diagnosis and therapeutic intervention of urinary incontinence. Current sEMG systems differ in regard to electrode arrangement and data reproducibility. The aim of this study was to determine the intrasession, intraday, and interday reliabilities of sEMG parameters using a probe with circumferential electrode-position. Methods The intrasession, intraday, and interday reliabilities of maximum isometric voluntary contractions (MVC) of the pelvic floor muscles were assessed for 19 healthy continent women. Three sEMG parameters that are used to describe muscle activity were verified: maximal EMG (EMGmax), mean over 500 ms around EMGmax (EMGA0.5), and mean over 2 seconds during MVC plateau (EMGA2-4). Relative and absolute reliability parameters were calculated, and the statistical methods described by Bland and Altman were applied to the data. Results We observed substantial reliabilities for all obtained parameters (EMGmax, EMGA2-4, and EMGA0.5) in regard to the intrasession measurements (ICC = 0.93-0.97; CI = 0.86-0.99). Overall, the intraday reliability has been moderate (ICC = 0.64-0.75; CI = 0.27-0.90). EMGmax (ICC = 0.75; CI = 0.45-0.90) and EMGA2-4 (ICC = 0.73, CI = 0.42-0.89) were higher than EMGA0.5 (ICC = 0.64; CI = 0.27-0.85). However, the interday reliability was only fair for EMGmax (ICC = 0.48; CI = 0.04-0.77) and EMGA0.5 (ICC = 0.51; CI = 0.07-0.78) but moderate for EMGA2-4 (ICC = 0.65; CI = 0.28-0.85). Conclusions This intrasession, intraday, and interday reliability results are similar to the results reported in the literature using probes with longitudinally oriented bars. The mean sEMG signal over 2 seconds (EMGA2-4) exhibited the highest reliability and is recommended for further studies. The interday reliability might be enhanced by considering the menstruation cycle.https://puma.ub.uni-stuttgart.de/bibtex/27e8bb871959ae6710fc36f435f60470c/mhartmannmhartmann2018-07-20T10:54:15+02:00phase resolution; compressible surface sharp interface method; tension; ghost-fluid latent transition; flow; vorlaeufig heat two-phase <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Stefan Fechter" itemprop="url" href="/person/11db17d28fd524bfc25df47ed16286487/author/0"><span itemprop="name">S. Fechter</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Claus-Dieter Munz" itemprop="url" href="/person/11db17d28fd524bfc25df47ed16286487/author/1"><span itemprop="name">C. Munz</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Christian Rohde" itemprop="url" href="/person/11db17d28fd524bfc25df47ed16286487/author/2"><span itemprop="name">C. Rohde</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Christoph Zeiler" itemprop="url" href="/person/11db17d28fd524bfc25df47ed16286487/author/3"><span itemprop="name">C. Zeiler</span></a></span></span>. </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">J. Comput. Phys.</span>, </em> </span>(<em><span>2017<meta content="2017" itemprop="datePublished"/></span></em>)</span>Fri Jul 20 10:54:15 CEST 2018J. Comput. Phys.347-374A sharp interface method for compressible liquid-vapor flow with phase transition and surface tension3362017phase resolution; compressible surface sharp interface method; tension; ghost-fluid latent transition; flow; vorlaeufig heat two-phase The numerical approximation of non-isothermal liquid-vapor flow within the compressible regime is a difficult task because complex physical effects at the phase interfaces can govern the global flow behavior. We present a sharp interface approach which treats the interface as a shock-wave like discontinuity. Any mixing of fluid phases is avoided by using the flow solver in the bulk regions only, and a ghost-fluid approach close to the interface. The coupling states for the numerical solution in the bulk regions are determined by the solution of local multi-phase Riemann problems across the interface. The Riemann solution accounts for the relevant physics by enforcing appropriate jump conditions at the phase boundary. A wide variety of interface effects can be handled in a thermodynamically consistent way. This includes surface tension or mass/energy transfer by phase transition. Moreover, the local normal speed of the interface, which is needed to calculate the time evolution of the interface, is given by the Riemann solution. The interface tracking itself is based on a level-set method. The focus in this paper is the description of the multi-phase Riemann solver and its usage within the sharp interface approach. One-dimensional problems are selected to validate the approach. Finally, the three-dimensional simulation of a wobbling droplet and a shock droplet interaction in two dimensions are shown. In both problems phase transition and surface tension determine the global bulk behavior.