Tm-Technisches Messen最新文献_第10页

Analysis of thrombosis risk of commissural misaligned transcatheter aortic valve prostheses using particle image velocimetry 颗粒图像测速法分析关节错位经导管主动脉瓣假体血栓形成风险

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-28 DOI: 10.1515/teme-2022-0100

F. Borowski, S. Kaule, Jan Oldenburg, K. Schmitz, A. Öner, M. Stiehm

{"title":"Analysis of thrombosis risk of commissural misaligned transcatheter aortic valve prostheses using particle image velocimetry","authors":"F. Borowski, S. Kaule, Jan Oldenburg, K. Schmitz, A. Öner, M. Stiehm","doi":"10.1515/teme-2022-0100","DOIUrl":"https://doi.org/10.1515/teme-2022-0100","url":null,"abstract":"Abstract Due to excellent clinical results, transcatheter aortic valve replacement (TAVR) has evolved to a treatment option for patients with low surgical risk, resulting in an increasing demand for durable heart valve prostheses. Durability of TAVR could be limited by leaflet thrombosis. Thrombus formation in the aortic root is mainly affected by the hemodynamic situation, which is dependent on the positioning of the implant. We investigated the flow field in the aortic root after TAVR implantation by means of particle image velocimetry. To quantify the influence of the implant-position with respect to an alignment or misalignment of the leaflet commissures on the thrombogenic potential, we used a transport equation for residence time (RT) to consider washout behavior. Furthermore, we introduced a shear effect criterion (SIE) to address platelet activation as a measure for a potential thrombus formation. Misaligned implantation of a TAVR resulted in a reversed direction of rotation of the occurring recirculation area. This led to fluid flow with comparable areas of increased relative blood RT (RTaligned: 97.6%, RTmisaligned: 88.0%) and a smaller area of low shear load for the misaligned TAVR (SIEaligned: 57.7%, SIEmisaligned: 3.70%) into the sinus region, indicating a higher potential for thrombus formation.","PeriodicalId":56086,"journal":{"name":"Tm-Technisches Messen","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75698998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Vereinfachtes Verfahren zur Ermittlung von Messunsicherheiten zur Bestimmung der Messprozesseignung industrieller Prüfprozesse 对于工业审计进程就得出衡量不确定性问题的简化程序

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-22 DOI: 10.1515/teme-2022-0004

Ernst Wiedenmann, T. Schlüter

引用次数: 0

Automated end-of-line quality assurance with visual inspection and convolutional neural networks 采用视觉检查和卷积神经网络的自动线末质量保证

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-17 DOI: 10.1515/teme-2022-0092

Hang-Young Kim, A. Frommknecht, Bernd Bieberstein, J. Stahl, Marco F. Huber

引用次数: 0

Explainable AI for sensor-based sorting systems 基于传感器的分类系统的可解释人工智能

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-17 DOI: 10.1515/teme-2022-0097

Mathias Anneken, M. Veerappa, Marco F. Huber, C. Kühnert, Felix Kronenwett, Georg Maier

引用次数: 0

Elektrische Levitationsdetektion für die Verwendung im Tissue Engineering 构造工程使用电子莱维探测器

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-17 DOI: 10.1515/teme-2022-0099

Stefan Scheunemann, C. Pientschke, U. Zabarylo, Kay Raum

{"title":"Elektrische Levitationsdetektion für die Verwendung im Tissue Engineering","authors":"Stefan Scheunemann, C. Pientschke, U. Zabarylo, Kay Raum","doi":"10.1515/teme-2022-0099","DOIUrl":"https://doi.org/10.1515/teme-2022-0099","url":null,"abstract":"Zusammenfassung Die Züchtung und Gestaltung biologischen Gewebes im Labor (Tissue Engineering) verspricht breite medizinische Anwendung. Die notwendige Strukturierung der künstlichen Gewebe kann mittels stehender Ultraschallwellen durch Levitation erfolgen. In diesem Beitrag wird eine Methode zur elektrischen Detektion der Levitation und Experimente zu ihrer Verifizierung vorgestellt. Die Ultraschallwellen werden mit piezoelektrischen Wandlern erzeugt. Die Kontrolle der Levitation beruht auf der Auswertung der Sendespannung. Optische Aufnahmen levitierter Kunststoffpartikel erlaubten die frequenzabhängige Ermittlung der Levitationsebenenabstände und eine Korrelation zu den Sendespannungen. Es zeigte sich, dass die Levitationsbedingung über einen relativ breiten Frequenzbereich erfüllt ist. Durch Berücksichtigung der frequenzabhängigen Sendeleistung kann mittels einer normierten Kurve ein gleichmäßiger Schalldruck über den gesamten für die Levitation relevanten Frequenzbereich eingestellt werden. Die gewonnenen Ergebnisse fließen in die Entwicklung eines Gerätes ein, mit dem parallel mehrere Proben für das Tissue Engineering per Levitation gezielt strukturiert werden können. Die Proben werden dabei nutzerfreundlich in Silikon- oder Teflon-Kammern prozessiert, indem ein Ultraschallsender und eine Reflektorplatte verwendet werden. Damit können Versuchsreihen zum Tissue-Engineering effizienter als bisher durchgeführt werden.","PeriodicalId":56086,"journal":{"name":"Tm-Technisches Messen","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81853083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement systems and sensors with cognitive features II 具有认知特征的测量系统与传感器2

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-15 DOI: 10.1515/teme-2023-0004

K. Sommer, M. Heizmann, A. Schütze

引用次数: 0

The SCALEX facility – an apparatus for scaled fluid dynamical experiments SCALEX设备-一种用于规模流体动力学实验的设备

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-10 DOI: 10.1515/teme-2022-0121

M. Sharifi Ghazijahani, C. Kästner, V. Valori, A. Thieme, K. Täschner, J. Schumacher, C. Cierpka

{"title":"The SCALEX facility – an apparatus for scaled fluid dynamical experiments","authors":"M. Sharifi Ghazijahani, C. Kästner, V. Valori, A. Thieme, K. Täschner, J. Schumacher, C. Cierpka","doi":"10.1515/teme-2022-0121","DOIUrl":"https://doi.org/10.1515/teme-2022-0121","url":null,"abstract":"Abstract The working conditions of the Scaled Convective Airflow Laboratory Experiment (SCALEX) at Technische Universität Ilmenau and sample experiments are reported. The SCALEX facility is a pressure vessel which allows for downscaling of laboratory experiments up to a factor of 20 by compression of gaseous working fluids, air or sulfur hexafluoride, to change the material properties of the fluid. The requirements and conditions for downscaling of fluid dynamical problems are discussed in detail. Long-term high and low pressure tests are conducted to screen the stability of the experimental environment inside the vessel against pressure and temperature fluctuations. Finally, a Rayleigh–Bénard convection experiment at an aspect ratio 10 is performed inside the SCALEX facility as a proof of concept. The reference experiment was conducted under 4.5 bar pressure for Ra = 1.9 × 105. However, the Rayleigh number could be varied in a wide range of Ra = 104 … 108. The flow investigation was pursued with stereoscopic particle image velocimetry in horizontal mid-plane through the convection cell. To improve the image quality the cameras were placed inside the pressure cell and tested up to 6 bar. Thus the feasibility of optical flow measurements at elevated pressures is shown.","PeriodicalId":56086,"journal":{"name":"Tm-Technisches Messen","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75886414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Kontaktlose induktive Strömungstomografie in grundlegender und angewandter Fluiddynamik 基本动力学的惯性插曲

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-10 DOI: 10.1515/teme-2022-0103

Max Sieger, Rahul Mitra, Ivan Glavinic, Matthias Ratajczak, S. Sonntag, Thomas Gundrum, F. Stefani, Thomas Wondrak, S. Eckert

引用次数: 1

Perspectives on AI-driven systems for multiple sensor data fusion 多传感器数据融合的人工智能驱动系统展望

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-09 DOI: 10.1515/teme-2022-0094

W. Koch

引用次数: 1

Analysis of the phase-dependent fluorescence decay time of treated wood using FD-FLIM 用FD-FLIM分析处理木材的相依赖荧光衰减时间

IF 1 4区工程技术

Tm-Technisches Messen Pub Date : 2023-02-02 DOI: 10.1515/teme-2022-0114

N. Leiter, M. Wohlschläger, M. Versen

引用次数: 0