TY  - JOUR
A1  - Schüller-Ruhl, Aaron
A1  - Dinstühler, Leonard
A1  - Senger, Thorsten
A1  - Bergfeld, Stefan
A1  - Ingenhag, Christian
A1  - Fleischhaker, Robert
ED  - Mackenzie, Jacob
T1  - Direct fabrication of arbitrary phase masks in optical glass via ultra-short pulsed laser writing of refractive index modifications
JF  - Applied Physics B
N2  - We study the possibility to fabricate an arbitrary phase mask in a one-step laser-writing process inside the volume of an optical glass substrate. We derive the phase mask from a Gerchberg–Saxton-type algorithm as an array and create each individual phase shift using a refractive index modification of variable axial length. We realize the variable axial length by superimposing refractive index modifications induced by an ultra-short pulsed laser at different focusing depth. Each single modification is created by applying 1000 pulses with 15 μJ pulse energy at 100 kHz to a fixed spot of 25 μm diameter and the focus is then shifted axially in steps of 10 μm. With several proof-of-principle examples, we show the feasibility of our method. In particular, we identify the induced refractive index change to about a value of Δn=1.5⋅10−3. We also determine our current limitations by calculating the overlap in the form of a scalar product and we discuss possible future improvements.
Y1  - 2022
U6  - http://dx.doi.org/10.1007/s00340-022-07928-2
SN  - 1432-0649 (Online)
SN  - 0946-2171 (Print)
N1  - Corresponding author: Robert Fleischhaker
VL  - 128
IS  - Article number: 208
SP  - 1
EP  - 11
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Becker, Meike
A1  - Frauenrath, Tobias
A1  - Hezel, Fabian
A1  - Krombach, Gabriele A.
A1  - Kremer, Ute
A1  - Koppers, Benedikt
A1  - Butenweg, Christoph
A1  - Goemmel, Andreas
A1  - Utting, Jane F.
A1  - Schulz-Menger, Jeanette
A1  - Niendorf, Thoralf
T1  - Comparison of left ventricular function assessment using phonocardiogram- and electrocardiogram-triggered 2D SSFP CINE MR imaging at 1.5 T and 3.0 T
JF  - European Radiology
N2  - Objective: As high-field cardiac MRI (CMR) becomes more widespread the propensity of ECG to interference from electromagnetic fields (EMF) and to magneto-hydrodynamic (MHD) effects increases and with it the motivation for a CMR triggering alternative. This study explores the suitability of acoustic cardiac triggering (ACT) for left ventricular (LV) function assessment in healthy subjects (n=14). Methods: Quantitative analysis of 2D CINE steady-state free precession (SSFP) images was conducted to compare ACT’s performance with vector ECG (VCG). Endocardial border sharpness (EBS) was examined paralleled by quantitative LV function assessment. Results: Unlike VCG, ACT provided signal traces free of interference from EMF or MHD effects. In the case of correct Rwave recognition, VCG-triggered 2D CINE SSFP was immune to cardiac motion effects—even at 3.0 T. However, VCG-triggered 2D SSFP CINE imaging was prone to cardiac motion and EBS degradation if R-wave misregistration occurred. ACT-triggered acquisitions yielded LV parameters (end-diastolic volume (EDV), endsystolic volume (ESV), stroke volume (SV), ejection fraction (EF) and left ventricular mass (LVM)) comparable with those derived fromVCG-triggered acquisitions (1.5 T: ESVVCG=(56± 17) ml, EDVVCG=(151±32)ml, LVMVCG=(97±27) g, SVVCG=(94± 19)ml, EFVCG=(63±5)% cf. ESVACT= (56±18) ml, EDVACT=(147±36) ml, LVMACT=(102±29) g, SVACT=(91± 22) ml, EFACT=(62±6)%; 3.0 T: ESVVCG=(55±21) ml, EDVVCG=(151±32) ml, LVMVCG=(101±27) g, SVVCG=(96±15) ml, EFVCG=(65±7)% cf. ESVACT=(54±20) ml, EDVACT=(146±35) ml, LVMACT= (101±30) g, SVACT=(92±17) ml, EFACT=(64±6)%). Conclusions: ACT’s intrinsic insensitivity to interference from electromagnetic fields renders
KW  - Magnetic resonance imaging (MRI)
KW  - MR-stethoscope
KW  - Magnetic field strength
KW  - Left ventriular function
KW  - Cardiovascular MRI
Y1  - 2010
U6  - http://dx.doi.org/10.1007/s00330-009-1676-z
SN  - 1432-1084 (Onlineausgabe)
SN  - 0938-7994 (Druckausgabe)
VL  - 20
SP  - 1344
EP  - 1355
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
ED  - Vacareanu, Radu
ED  - Ionescu, Constantin
T1  - Seismic design and evaluation of industrial facilities
T2  - Progresses in European Earthquake Engineering and Seismology. Third European Conference on Earthquake Engineering and Seismology – Bucharest, 2022
N2  - Industrial facilities must be thoroughly designed to withstand seismic
actions as they exhibit an increased loss potential due to the possibly wideranging
damage consequences and the valuable process engineering equipment.
Past earthquakes showed the social and political consequences of seismic damage
to industrial facilities and sensitized the population and politicians worldwide
for the possible hazard emanating from industrial facilities. However, a holistic
approach for the seismic design of industrial facilities can presently neither be
found in national nor in international standards. The introduction of EN 1998-4
of the new generation of Eurocode 8 will improve the normative situation with
specific seismic design rules for silos, tanks and pipelines and secondary process
components. The article presents essential aspects of the seismic design of
industrial facilities based on the new generation of Eurocode 8 using the example
of tank structures and secondary process components. The interaction effects of
the process components with the primary structure are illustrated by means of
the experimental results of a shaking table test of a three story moment resisting
steel frame with different process components. Finally, an integrated approach of
digital plant models based on building information modelling (BIM) and structural
health monitoring (SHM) is presented, which provides not only a reliable
decision-making basis for operation, maintenance and repair but also an excellent
tool for rapid assessment of seismic damage.
KW  - Industrial facilities
KW  - Seismic design
KW  - Tanks
KW  - EN 1998-4
KW  - Structural health monitoring
Y1  - 2022
SN  - 978-3-031-15103-3
SN  - 978-3-031-15106-4
SN  - 978-3-031-15104-0
U6  - http://dx.doi.org/10.1007/978-3-031-15104-0
SN  - 2524-342X
SN  - 2524-3438
N1  - Third European Conference on Earthquake Engineering and Seismology. 04-09.09 Bucharest, Romania.
SP  - 449
EP  - 464
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Baier, Ralph
A1  - Brauner, Philipp
A1  - Brillowski, Florian
A1  - Dammers, Hannah
A1  - Liehner, Luca
A1  - Pütz, Sebastian
A1  - Schneider, Sebastian
A1  - Schollemann, Alexander
A1  - Steuer-Dankert, Linda
A1  - Vervier, Luisa
A1  - Gries, Thomas
A1  - Leicht-Scholten, Carmen
A1  - Mertens, Alexander
A1  - Nagel, Saskia K.
A1  - Schuh, Günther
A1  - Ziefle, Martina
A1  - Nitsch, Verena
ED  - Brecher, Christian
ED  - Schuh, Günther
ED  - van der Alst, Wil
ED  - Jarke, Matthias
ED  - Piller, Frank T.
ED  - Padberg, Melanie
T1  - Human-centered work design for the internet of production
T2  - Internet of production - fundamentals, applications and proceedings
N2  - Like all preceding transformations of the manufacturing industry, the large-scale usage of production data will reshape the role of humans within the sociotechnical production ecosystem. To ensure that this transformation creates work systems in which employees are empowered, productive, healthy, and motivated, the transformation must be guided by principles of and research on human-centered work design. Specifically, measures must be taken at all levels of work design, ranging from (1) the work tasks to (2) the working conditions to (3) the organizational level and (4) the supra-organizational level. We present selected research across all four levels that showcase the opportunities and requirements that surface when striving for human-centered work design for the Internet of Production (IoP). (1) On the work task level, we illustrate the user-centered design of human-robot collaboration (HRC) and process planning in the composite industry as well as user-centered design factors for cognitive assistance systems. (2) On the working conditions level, we present a newly developed framework for the classification of HRC workplaces. (3) Moving to the organizational level, we show how corporate data can be used to facilitate best practice sharing in production networks, and we discuss the implications of the IoP for new leadership models. Finally, (4) on the supra-organizational level, we examine overarching ethical dimensions, investigating, e.g., how the new work contexts affect our understanding of responsibility and normative values such as autonomy and privacy. Overall, these interdisciplinary research perspectives highlight the importance and necessary scope of considering the human factor in the IoP.
KW  - Responsibility
KW  - Privacy
KW  - Digital leadership
KW  - Best practice sharing
KW  - Cognitive assistance system
KW  - Human-robot collaboration
KW  - Human-centered work design
Y1  - 2023
SN  - 978-3-030-98062-7
U6  - http://dx.doi.org/10.1007/978-3-030-98062-7_19-1
N1  - Part of the book series: Interdisciplinary Excellence Accelerator Series (IDEAS)
SP  - 1
EP  - 23
PB  - Springer
CY  - Cham
ER  -