TY - JOUR
A1 - Heuermann, Holger
A1 - Schiek, B.
T1 - Results of network analyzer measurements with leakage errors-corrected with direct calibration techniques
JF - IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 46 (1997), H. 5
Y1 - 1997
SN - 0018-9456
SP - 1120
EP - 1127
ER -
TY - JOUR
A1 - Streese, Lukas
A1 - Kotliar, Konstantin
A1 - Deiseroth, Arne
A1 - Infanger, Denis
A1 - Gugleta, Konstantin
A1 - Schmaderer, Christoph
A1 - Hanssen, Henner
T1 - Retinal endothelial function in cardiovascular risk patients: A randomized controlled exercise trial
JF - Scandinavian Journal of Medicine and Science in Sports
N2 - The aim of this study was to investigate, for the first time, the effects of high-intensity interval training (HIIT) on retinal microvascular endothelial function in cardiovascular (CV) risk patients. In the randomized controlled trial, middle-aged and previously sedentary patients with increased CV risk (aged 58 ± 6 years) with ≥ two CV risk factors were randomized into a 12-week HIIT (n = 33) or control group (CG, n = 36) with standard physical activity recommendations. A blinded examiner measured retinal endothelial function by flicker light-induced maximal arteriolar (ADmax) and venular (VDmax) dilatation as well as the area under the arteriolar (AFarea) and venular (VFarea) flicker curve using a retinal vessel analyzer. Standardized assessments of CV risk factors, cardiorespiratory fitness, and retinal endothelial function were performed before and after HIIT. HIIT reduced body mass index, fat mass, and low-density lipoprotein and increased muscle mass and peak oxygen uptake (VO2peak). Both ADmax (pre: 2.7 ± 2.1%, post: 3.0 ± 2.2%, P = .018) and AFarea (pre: 32.6 ± 28.4%*s, post: 37.7 ± 30.6%*s, P = .016) increased after HIIT compared with CG (ADmax, pre: 3.2 ± 1.8%, post: 2.9 ± 1.8%, P = .254; AFarea, pre: 41.6 ± 28.5%*s, post: 37.8 ± 27.0%*s, P = .186). Venular function remained unchanged after HIIT. There was a significant association between ∆-change VO2peak and ∆-changes ADmax and AFarea (P = .026, R² = 0.073; P = .019, R² = 0.081, respectively). 12-weeks of HIIT improved retinal endothelial function in middle-aged patients with increased CV risk independent of the reduction in classical CV risk factors. Exercise has the potential to reverse or at least postpone progression of small vessel disease in older adults with increased CV risk under standard medication. Dynamic retinal vessel analysis seems to be a sensitive tool to detect treatment effects of exercise interventions on retinal microvascular endothelial function in middle-aged individuals with increased CV risk.
Y1 - 2020
U6 - https://doi.org/10.1111/sms.13560
SN - 1600-0838
VL - 30
IS - 2
SP - 272
EP - 280
PB - Wiley
CY - Oxford
ER -
TY - JOUR
A1 - Ramoshaba, Nthai E.
A1 - Huisman, Hugo W.
A1 - Lammertyn, Leandi
A1 - Kotliar, Konstantin
A1 - Schutte, Aletta E.
A1 - Smith, Wayne
T1 - Retinal microvasculature and masked hypertension in young adults: the African-PREDICT study
JF - Hypertension Research
N2 - Masked hypertension is known to induce microvascular complications. However, it is unclear whether early microvascular changes are already occurring in young, otherwise healthy adults. We therefore investigated whether retinal microvascular calibers and acute responses to a flicker stimulus are related to masked hypertension. We used the baseline data of 889 participants aged 20–30 years who were taking part in the African Prospective study on the Early Detection and Identification of Cardiovascular Disease and Hypertension. Clinic and 24-h ambulatory blood pressure were measured. The central retinal artery equivalent (CRAE) and central retinal vein equivalent were calculated from fundus images, and retinal vessel dilation was determined in response to flicker light-induced provocation. A smaller CRAE was observed in those with masked hypertension vs. those with normotension (157.1 vs. 161.2 measuring units, P < 0.001). In forward multivariable-adjusted regression analysis, only CRAE was negatively related to masked hypertension [adjusted R² = 0.267, β = −0.097 (95% CI = −0.165; −0.029), P = 0.005], but other retinal microvascular parameters were not associated with masked hypertension. In multivariable logistic regression analyses, masked hypertension [OR = 2.333, (95% CI = 1.316; 4.241), P = 0.004] was associated with a narrower CRAE. In young healthy adults, masked hypertension was associated with retinal arteriolar narrowing, thereby reflecting early microvascular alterations known to predict cardiovascular outcomes in later life.
Y1 - 2020
U6 - https://doi.org/10.1038/s41440-020-0487-0
SN - 1348-4214
IS - 43
SP - 1231
EP - 1238
PB - Springer Nature
CY - Osaka
ER -
TY - JOUR
A1 - Kotliar, Konstantin
A1 - Hanssen, Henner
A1 - Eberhardt, Karla
A1 - Vilser, Walthard
A1 - Schmaderer, Christoph
A1 - Halle, Martin
A1 - Heemann, Uwe
A1 - Baumann, M.
T1 - Retinal pulse wave velocity in young male normotensive and mildly hypertensive subjects
JF - Microcirculation
Y1 - 2013
SN - 1549-8719
N1 - Accepted Article (Accepted, unedited articles published online and citable. The final edited and typeset version of record will appear in future.)
PB - Wiley
CY - Malden
ER -
TY - JOUR
A1 - Albanna, W.
A1 - Conzen, C.
A1 - Weiss, M.
A1 - Clusmann, H.
A1 - Fuest, M.
A1 - Mueller, M.
A1 - Brockmann, M.A.
A1 - Vilser, W.
A1 - Schmidt-Trucksäss, A.
A1 - Hoellig, A.
A1 - Seiz, M.
A1 - Thomé, C.
A1 - Kotliar, Konstantin
A1 - Schubert, G.A.
T1 - Retinal Vessel Analysis (RVA) in the context of subarachnoid hemorrhage: A proof of concept study
JF - PLoS ONE
N2 - Background
Timely detection of impending delayed cerebral ischemia after subarachnoid hemorrhage (SAH) is essential to improve outcome, but poses a diagnostic challenge. Retinal vessels as an embryological part of the intracranial vasculature are easily accessible for analysis and may hold the key to a new and non-invasive monitoring technique. This investigation aims to determine the feasibility of standardized retinal vessel analysis (RVA) in the context of SAH.
Methods
In a prospective pilot study, we performed RVA in six patients awake and cooperative with SAH in the acute phase (day 2–14) and eight patients at the time of follow-up (mean 4.6±1.7months after SAH), and included 33 age-matched healthy controls. Data was acquired using a manoeuvrable Dynamic Vessel Analyzer (Imedos Systems UG, Jena) for examination of retinal vessel dimension and neurovascular coupling.
Results
Image quality was satisfactory in the majority of cases (93.3%). In the acute phase after SAH, retinal arteries were significantly dilated when compared to the control group (124.2±4.3MU vs 110.9±11.4MU, p<0.01), a difference that persisted to a lesser extent in the later stage of the disease (122.7±17.2MU, p<0.05). Testing for neurovascular coupling showed a trend towards impaired primary vasodilation and secondary vasoconstriction (p = 0.08, p = 0.09 resp.) initially and partial recovery at the time of follow-up, indicating a relative improvement in a time-dependent fashion.
Conclusion
RVA is technically feasible in patients with SAH and can detect fluctuations in vessel diameter and autoregulation even in less severely affected patients. Preliminary data suggests potential for RVA as a new and non-invasive tool for advanced SAH monitoring, but clinical relevance and prognostic value will have to be determined in a larger cohort.
Y1 - 2016
U6 - https://doi.org/10.1371/journal.pone.0158781
SN - 1932-6203
VL - 11
IS - 7
PB - PLOS
CY - San Francisco
ER -
TY - JOUR
A1 - Smith, Wayne
A1 - Kotliar, Konstantin
A1 - Lammertyn, Leandi
A1 - Ramoshaba, Nthai E.
A1 - Vilser, Walthard
A1 - Huisman, Hugo W.
A1 - Schutte, Aletta E.
T1 - Retinal vessel caliber and caliber responses in true normotensive black and white adults: The African-PREDICT study
JF - Microvascular Research
N2 - Purpose
Globally, a detrimental shift in cardiovascular disease risk factors and a higher mortality level are reported in some black populations. The retinal microvasculature provides early insight into the pathogenesis of systemic vascular diseases, but it is unclear whether retinal vessel calibers and acute retinal vessel functional responses differ between young healthy black and white adults.
Methods
We included 112 black and 143 white healthy normotensive adults (20–30 years). Retinal vessel calibers (central retinal artery and vein equivalent (CRAE and CRVE)) were calculated from retinal images and vessel caliber responses to flicker light induced provocation (FLIP) were determined. Additionally, ambulatory blood pressure (BP), anthropometry and blood samples were collected.
Results
The groups displayed similar 24 h BP profiles and anthropometry (all p > .24). Black participants demonstrated a smaller CRAE (158 ± 11 vs. 164 ± 11 MU, p < .001) compared to the white group, whereas CRVE was similar (p = .57). In response to FLIP, artery maximal dilation was greater in the black vs. white group (5.6 ± 2.1 vs. 3.3 ± 1.8%; p < .001).
Conclusions
Already at a young age, healthy black adults showed narrower retinal arteries relative to the white population. Follow-up studies are underway to show if this will be related to increased risk for hypertension development. The reason for the larger vessel dilation responses to FLIP in the black population is unclear and warrants further investigation.
Y1 - 2020
U6 - https://doi.org/10.1016/j.mvr.2019.103937
SN - 0026-2862
VL - 128
IS - Article 103937
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Kotliar, Konstantin
A1 - Vilser, Walthatd
A1 - Nagel, Edgar
A1 - Lanzl, Ines M.
T1 - Retinal vessel reaction in response to chromatic flickering light / Kotliar, Konstantin E. ; Vilser, Walthard ; Nagel, Edgar ; Lanzl, Ines M.
JF - Graefe's Archive for Clinical and Experimental Ophthalmology. 242 (2004), H. 5
Y1 - 2004
SN - 1435-702X
SP - 377
EP - 392
PB - -
ER -
TY - JOUR
A1 - Neumaier, Felix
A1 - Kotliar, Konstantin
A1 - Haeren, Roel Hubert Louis
A1 - Temel, Yasin
A1 - Lüke, Jan Niklas
A1 - Seyam, Osama
A1 - Lindauer, Ute
A1 - Clusmann, Hans
A1 - Hescheler, Jürgen
A1 - Schubert, Gerrit Alexander
A1 - Schneider, Toni
A1 - Albanna, Walid
T1 - Retinal Vessel Responses to Flicker Stimulation Are Impaired in Ca v 2.3-Deficient Mice—An in- vivo Evaluation Using Retinal Vessel Analysis (RVA)
JF - Frontiers in Neurology
Y1 - 2021
U6 - https://doi.org/10.3389/fneur.2021.659890
VL - 12
SP - 1
EP - 11
PB - Frontiers
ER -
TY - JOUR
A1 - Rhoden, Imke
A1 - Ball, Christopher Stephen
A1 - Grajewski, Matthias
A1 - Kuckshinrich, Wilhelm
T1 - Reverse engineering of stakeholder preferences – A multi-criteria assessment of the German passenger car sector
JF - Renewable and Sustainable Energy Reviews
N2 - Germany is a frontrunner in setting frameworks for the transition to a low-carbon system. The mobility sector plays a significant role in this shift, affecting different people and groups on multiple levels. Without acceptance from these stakeholders, emission targets are out of reach. This research analyzes how the heterogeneous preferences of various stakeholders align with the transformation of the mobility sector, looking at the extent to which the German transformation paths are supported and where stakeholders are located.
Under the research objective of comparing stakeholders' preferences to identify which car segments require additional support for a successful climate transition, a status quo of stakeholders and car performance criteria is the foundation for the analysis. Stakeholders' hidden preferences hinder the derivation of criteria weightings from stakeholders; therefore, a ranking from observed preferences is used. This study's inverse multi-criteria decision analysis means that weightings can be predicted and used together with a recalibrated performance matrix to explore future preferences toward car segments.
Results show that stakeholders prefer medium-sized cars, with the trend pointing towards the increased potential for alternative propulsion technologies and electrified vehicles. These insights can guide the improved targeting of policy supporting the energy and mobility transformation. Additionally, the method proposed in this work can fully handle subjective approaches while incorporating a priori information. A software implementation of the proposed method completes this work and is made publicly available.
KW - Regionalization
KW - Multi-criteria decision analysis
KW - Preference assessment
KW - E-Mobility
KW - Mobility transition
Y1 - 2023
U6 - https://doi.org/10.1016/j.rser.2023.113352
SN - 1364-0321
VL - 181
IS - July 2023
SP - Article number: 113352
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Seibler, Jost
A1 - Kleinridders, Andre
A1 - Küter-Luks, Birgit
A1 - Niehaves, Sandra
A1 - Brüning, Jens C.
A1 - Schwenk, Frieder
T1 - Reversible gene knockdown in mice using a tight, inducible shRNA expression system
JF - Nucleic Acids Research
Y1 - 2007
U6 - https://doi.org/10.1093/nar/gkm122
SN - 1362-4962
VL - 35
IS - 7
SP - e54
ER -
TY - JOUR
A1 - Kämper, Klaus-Peter
A1 - Pappas, D. P.
A1 - Hopster, H.
T1 - Reversible transition between perpendicular and in-plane magnetization in ultrathin films. Pappas, D. P.; Kämper, K.-P.; Hopster, H.
JF - Physical Review Letters. 64 (1990), H. 26
Y1 - 1990
SN - 1079-7114
SP - 3179
EP - 3182
ER -
TY - JOUR
A1 - Hagemann, Hans-Jürgen
A1 - Hennings, D.
T1 - Reversible Weight change of acceptor-doped BaTiO3. Hagemann, H. J.; Hennings, D.
JF - Journal of the American Ceramic Society. 64 (1981)
Y1 - 1981
SN - 0002-7820
SP - 590
EP - 594
ER -
TY - JOUR
A1 - Sattler, Johannes Christoph
A1 - Röger, Marc
A1 - Schwarzbözl, Peter
A1 - Buck, Reiner
A1 - Macke, Ansgar
A1 - Raeder, Christian
A1 - Göttsche, Joachim
T1 - Review of heliostat calibration and tracking control methods
JF - Solar Energy
N2 - Large scale central receiver systems typically deploy between thousands to more than a hundred thousand heliostats. During solar operation, each heliostat is aligned individually in such a way that the overall surface normal bisects the angle between the sun’s position and the aim point coordinate on the receiver. Due to various tracking error sources, achieving accurate alignment ≤1 mrad for all the heliostats with respect to the aim points on the receiver without a calibration system can be regarded as unrealistic. Therefore, a calibration system is necessary not only to improve the aiming accuracy for achieving desired flux distributions but also to reduce or eliminate spillage. An overview of current larger-scale central receiver systems (CRS), tracking error sources and the basic requirements of an ideal calibration system is presented. Leading up to the main topic, a description of general and specific terms on the topics heliostat calibration and tracking control clarifies the terminology used in this work. Various figures illustrate the signal flows along various typical components as well as the corresponding monitoring or measuring devices that indicate or measure along the signal (or effect) chain. The numerous calibration systems are described in detail and classified in groups. Two tables allow the juxtaposition of the calibration methods for a better comparison. In an assessment, the advantages and disadvantages of individual calibration methods are presented.
Y1 - 2020
U6 - https://doi.org/10.1016/j.solener.2020.06.030
VL - 207
SP - 110
EP - 132
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Maderwald, Stefan
A1 - Poser, Benedikt Andreas
A1 - Bitz, Andreas
A1 - Quick, Harald H.
A1 - Ladd, Mark E.
T1 - RF excitation using time interleaved acquisition of modes (TIAMO) to address B1 inhomogeneity in high-field MRI
JF - Magnetic Resonance in Medicine
N2 - As the field strength and, therefore, the operational frequency in MRI is increased, the wavelength approaches the size of the human head/body, resulting in wave effects, which cause signal decreases and dropouts. Several multichannel approaches have been proposed to try to tackle these problems, including RF shimming, where each element in an array is driven by its own amplifier and modulated with a certain (constant) amplitude and phase relative to the other elements, and Transmit SENSE, where spatially tailored RF pulses are used. In this article, a relatively inexpensive and easy to use imaging scheme for 7 Tesla imaging is proposed to mitigate signal voids due to B1 field inhomogeneity. Two time-interleaved images are acquired using a different excitation mode for each. By forming virtual receive elements, both images are reconstructed together using GRAPPA to achieve a more homogeneous image, with only small SNR and SAR penalty in head and body imaging at 7 Tesla.
Y1 - 2010
U6 - https://doi.org/10.1002/mrm.22527
SN - 1522-2594
VL - 64
IS - 2
SP - 327
EP - 333
PB - Wiley-Liss
CY - New York
ER -
TY - JOUR
A1 - Hansen, Volkert W.
A1 - Bitz, Andreas
A1 - Streckert, Joachim R.
T1 - RF Exposure of Biological Systems in Radial Waveguides
JF - IEEE Transactions on Electromagnetic Compatibility
Y1 - 1999
U6 - https://doi.org/10.1109/15.809852
SN - 1558-187X
VL - 41
IS - 4
SP - 487
EP - 493
ER -
TY - JOUR
A1 - Fiedler, Thomas M.
A1 - Ladd, Mark E.
A1 - Bitz, Andreas
T1 - RF safety assessment of a bilateral four-channel transmit/receive 7 Tesla breast coil: SAR versus temperature limits
JF - Medical Physics
Y1 - 2017
U6 - https://doi.org/10.1002/mp.12034
N1 - This article is corrected by:
Errata: Erratum: “RF safety assessment of a bilateral four-channel transmit/receive 7 Tesla breast coil: SAR versus tissue temperature limits” [Med. Phys. 44(1), 143–157 (2017)] Volume 44, Issue 2, 772
VL - 44
IS - 1
SP - 143
EP - 157
ER -
TY - JOUR
A1 - Kurulgan Demirci, Eylem
A1 - Demirci, Taylan
A1 - Linder, Peter
A1 - Trzewik, Jürgen
A1 - Gierkowski, Jessica Ricarda
A1 - Gossmann, Matthias
A1 - Kayser, Peter
A1 - Porst, Dariusz
A1 - Digel, Ilya
A1 - Artmann, Gerhard
A1 - Temiz Artmann, Aysegül
T1 - rhAPC reduces the endothelial cell permeability via a decrease of contractile tensions induced by endothelial cells
JF - Journal of Bioscience and Bioengineering
N2 - All cells generate contractile tension. This strain is crucial for mechanically controlling the cell shape, function and survival. In this study, the CellDrum technology quantifying cell's (the cellular) mechanical tension on a pico-scale was used to investigate the effect of lipopolysaccharide (LPS) on human aortic endothelial cell (HAoEC) tension. The LPS effect during gram-negative sepsis on endothelial cells is cell contraction causing endothelium permeability increase. The aim was to finding out whether recombinant activated protein C (rhAPC) would reverse the endothelial cell response in an in-vitro sepsis model. In this study, the established in-vitro sepsis model was confirmed by interleukin 6 (IL-6) levels at the proteomic and genomic levels by ELISA, real time-PCR and reactive oxygen species (ROS) activation by florescence staining. The thrombin cellular contraction effect on endothelial cells was used as a positive control when the CellDrum technology was applied. Additionally, the Ras homolog gene family, member A (RhoA) mRNA expression level was checked by real time-PCR to support contractile tension results. According to contractile tension results, the mechanical predominance of actin stress fibers was a reason of the increased endothelial contractile tension leading to enhanced endothelium contractility and thus permeability enhancement. The originality of this data supports firstly the basic measurement principles of the CellDrum technology and secondly that rhAPC has a beneficial effect on sepsis influenced cellular tension. The technology presented here is promising for future high-throughput cellular tension analysis that will help identify pathological contractile tension responses of cells and prove further cell in-vitro models.
KW - Cell permeability
KW - Cellular force
KW - Endothelial cells
KW - Recombinant activated protein C
KW - Lipopolysaccharide
KW - Contractile tension
KW - CellDrum
Y1 - 2012
U6 - https://doi.org/10.1016/j.jbiosc.2012.03.019
SN - 1347-4421
VL - 113
IS - 2
SP - 212
EP - 219
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Hillen, Walter
T1 - RHO-RHO production by two photon scattering. TASSO Collaboration
JF - Physics Letters B. 97 (1980), H. 3-4
Y1 - 1980
SN - 0370-2693
SP - 448
EP - 452
ER -
TY - JOUR
A1 - Schlieper, G.
A1 - Brandenburg, V.
A1 - Djuric, Z.
A1 - Damjanovic, T.
A1 - Markovic, N.
A1 - Schurgers, L.
A1 - Krüger, T.
A1 - Westenfeld, R.
A1 - Ackermann, D.
A1 - Haselhuhn, Angelika
A1 - Dimkovic, S.
A1 - Ketteler, M.
A1 - Floege, J.
A1 - Dimkovic, N.
T1 - Risk factors for cardiovascular calcifications in non-diabetic Caucasian haemodialysis patients
JF - Kidney & blood pressure research
Y1 - 2009
SN - 1423-0143 (E-Journal); 0378-5858 (Print); 1011-6524 (Print); 1420-4096 (Print)
VL - Vol. 32
SP - 161
EP - 168
ER -
TY - JOUR
A1 - Pietsch, Wolfram
T1 - Risk-based Deployment of Standard Software Rollout Processes - a pragmatic approach
JF - QFD : transactions from the Eleventh Symposium on Quality Function Deployment, [June 12 - 18, 1999, Novi, Michigan] / QFD Institute
Y1 - 1999
SN - 1889477117
N1 - Symposium on Quality Function Deployment ; (11, 1999, Novi, Mich.) Online unter: http://www.herzwurm.de/Publikationen/daten/lit/deployment.pdf
SP - 349
EP - 359
PB - QFD Institute
CY - Ann Arbor, Mich.
ER -
TY - JOUR
A1 - Wiegand, Sandra
A1 - Dietrich, Sascha
A1 - Hertel, Robert
A1 - Bongaerts, Johannes
A1 - Evers, Stefan
A1 - Volland, Sonja
A1 - Daniel, Rolf
A1 - Liesegang, Heiko
T1 - RNA-Seq of Bacillus licheniformis: active regulatory RNA features expressed within a productive fermentation
JF - BMC genomics
Y1 - 2013
SN - 1471-2164
VL - Vol. 14
SP - 667
PB - BioMed Central
CY - London
ER -
TY - JOUR
A1 - Ferrein, Alexander
A1 - Marais, Stephen
A1 - Potgieter, Anet
A1 - Steinbauer, Gerald
T1 - RoboCup Junior: A vehicle for S&T education in Africa?
Y1 - 2011
SN - 978-1-61284-992-8
N1 - AFRICON, 2011
SP - 1
EP - 6
PB - IEEE
CY - New York
ER -
TY - JOUR
A1 - Ferrein, Alexander
A1 - Steinbauer, Gerald
A1 - McPhillips, Graeme
A1 - Potgieter, Anet
T1 - RoboCup Standard Platform League - Team Zadeat : an intercontinental research effort
Y1 - 2008
SP - 1
EP - 7
ER -
TY - JOUR
A1 - Michaux, F.
A1 - Mattern, P.
A1 - Kallweit, Stephan
T1 - RoboPIV: how robotics enable PIV on a large industrial scale
JF - Measurement Science and Technology
N2 - This work demonstrates how the interaction between particle image velocimetry (PIV) and robotics can massively increase measurement efficiency. The interdisciplinary approach is shown using the complex example of an automated, large scale, industrial environment: a typical automotive wind tunnel application. Both the high degree of flexibility in choosing the measurement region and the complete automation of stereo PIV measurements are presented. The setup consists of a combination of three robots, individually used as a 6D traversing unit for the laser illumination system as well as for each of the two cameras. Synchronised movements in the same reference frame are realised through a master-slave setup with a single interface to the user. By integrating the interface into the standard wind tunnel management system, a single measurement plane or a predefined sequence of several planes can be requested through a single trigger event, providing the resulting vector fields within minutes.
In this paper, a brief overview on the demands of large scale industrial PIV and the existing solutions is given. Afterwards, the concept of RoboPIV is introduced as a new approach. In a first step, the usability of a selection of commercially available robot arms is analysed. The challenges of pose uncertainty and importance of absolute accuracy are demonstrated through comparative measurements, explaining the individual pros and cons of the analysed systems. Subsequently, the advantage of integrating RoboPIV directly into the existing wind tunnel management system is shown on basis of a typical measurement sequence. In a final step, a practical measurement procedure, including post-processing, is given by using real data and results. Ultimately, the benefits of high automation are demonstrated, leading to a drastic reduction in necessary measurement time compared to non-automated systems, thus massively increasing the efficiency of PIV measurements.
Y1 - 2018
U6 - https://doi.org/10.1088/1361-6501/aab5c1
SN - 1361-6501
N1 - Special Section on the 12th International Symposium on Particle Image Velocimetry (PIV 2017)
VL - 29
IS - 7
SP - 074009
PB - IOP
CY - Bristol
ER -
TY - JOUR
A1 - Ferrein, Alexander
T1 - Robot controllers for highly dynamic environments with real-time constraints
JF - Künstliche Intelligenz : KI. 24 (2010), H. 2
Y1 - 2010
SN - 1610-1987
SP - 175
EP - 178
ER -
TY - JOUR
A1 - Kirstein, Simon
A1 - Müller, Karsten
A1 - Walecki-Mingers, Mark
A1 - Deserno, Thomas M.
T1 - Robust adaptive flow line detection in sewer pipes
JF - Automation in construction
N2 - As part of a novel approach to automatic sewer inspection, this paper presents a robust algorithm for automatic flow line detection. A large image repository is obtained from about 50,000 m sewers to represent the high variability of real world sewer systems. Automatic image processing combines Canny edge detection, Hough transform for straight lines and cost minimization using Dijkstra's shortest path algorithm. Assuming that flow lines are mostly smoothly connected horizontal structures, piecewise flow line delineation is reduced to a process of selecting adjacent line candidates. Costs are derived from the gap between adjacent candidates and their reliability. A single parameter α enables simple control of the algorithm. The detected flow line may precisely follow the segmented edges (α = 0.0) or minimize gaps at joints (α = 1.0). Both, manual and ground truth-based analysis indicate that α = 0.8 is optimal and independent of the sewer's material. The algorithm forms an essential step to further automation of sewer inspection.
Y1 - 2012
U6 - https://doi.org/10.1016/j.autcon.2011.05.009
SN - 1872-7891 (E-Journal) ; 0926-5805 (Print)
IS - 21
SP - 24
EP - 31
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Heuermann, Holger
A1 - Schiek, B.
T1 - Robust Algorithms for Txx Network Analyzer Self-Calibration Procedures
JF - IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 43 (1994), H. 1
Y1 - 1994
SN - 0018-9456
SP - 18
EP - 23
ER -
TY - JOUR
A1 - Vögele, Stefan
A1 - Josyabhatla, Vishnu Teja
A1 - Ball, Christopher
A1 - Rhoden, Imke
A1 - Grajewski, Matthias
A1 - Rübbelke, Dirk
A1 - Kuckshinrichs, Wilhelm
T1 - Robust assessment of energy scenarios from stakeholders' perspectives
JF - Energy
N2 - Using scenarios is vital in identifying and specifying measures for successfully transforming the energy system. Such transformations can be particularly challenging and require the support of a broader set of stakeholders. Otherwise, there will be opposition in the form of reluctance to adopt the necessary technologies. Usually, processes for considering stakeholders' perspectives are very time-consuming and costly. In particular, there are uncertainties about how to deal with modifications in the scenarios. In principle, new consulting processes will be required. In our study, we show how multi-criteria decision analysis can be used to analyze stakeholders' attitudes toward transition paths. Since stakeholders differ regarding their preferences and time horizons, we employ a multi-criteria decision analysis approach to identify which stakeholders will support or oppose a transition path. We provide a flexible template for analyzing stakeholder preferences toward transition paths. This flexibility comes from the fact that our multi-criteria decision aid-based approach does not involve intensive empirical work with stakeholders. Instead, it involves subjecting assumptions to robustness analysis, which can help identify options to influence stakeholders' attitudes toward transitions.
Y1 - 2023
U6 - https://doi.org/10.1016/j.energy.2023.128326
SN - 1873-6785 (Online)
SN - 0360-5442 (Print)
IS - In Press, Article 128326
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Ferrein, Alexander
A1 - Jacobs, Stefan
A1 - Schiffer, Stefan
A1 - Beck, Daniel
T1 - Robust Collision Avoidance in Unknown Domestic Environments / Jacobs, Stefan ; Ferrein, Alexander ; Schiffer, Stefan ; Beck, Daniel ; Lakemeyer, Gerhard
JF - ROBOCUP 2009: ROBOT SOCCER WORLD CUP XIII
Y1 - 2009
N1 - Lecture Notes in Computer Science ; 5949
SP - 116
EP - 127
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Valero, Daniel
A1 - Chanson, Hubert
A1 - Bung, Daniel Bernhard
T1 - Robust estimators for free surface turbulence characterization: A stepped spillway application
JF - Flow Measurement and Instrumentation
N2 - Robust estimators are parameters insensitive to the presence of outliers. However, they presume the shape of the variables’ probability density function. This study exemplifies the sensitivity of turbulent quantities to the use of classic and robust estimators and the presence of outliers in turbulent flow depth time series. A wide range of turbulence quantities was analysed based upon a stepped spillway case study, using flow depths sampled with Acoustic Displacement Meters as the flow variable of interest. The studied parameters include: the expected free surface level, the expected fluctuation intensity, the depth skewness, the autocorrelation timescales, the vertical velocity fluctuation intensity, the perturbations celerity and the one-dimensional free surface turbulence spectrum. Three levels of filtering were utilised prior to applying classic and robust estimators, showing that comparable robustness can be obtained either using classic estimators together with an intermediate filtering technique or using robust estimators instead, without any filtering technique.
Y1 - 2020
U6 - https://doi.org/10.1016/j.flowmeasinst.2020.101809
SN - 0955-5986
VL - 76
IS - Art. 101809
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Valero, Daniel
A1 - Chanson, Hubert
A1 - Bung, Daniel Bernhard
T1 - Robust estimators for turbulence properties assessment
Y1 - 2019
SP - 1
EP - 24
ER -
TY - JOUR
A1 - Wedrowski, M.
A1 - Bruyndonckx, P.
A1 - Tavernier, S.
A1 - Zhi, L.
A1 - Dang, J.
A1 - Mendes, P. R.
A1 - Perez, J. M.
A1 - Ziemons, Karl
T1 - Robustness of neural networks algorithm for gamma detection in monolithic block detector, positron emission tomography
JF - 2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)
N2 - The monolithic scintillator block approach for gamma detection in the Positron Emission Tomography (PET) avoids estimating Depth of Interaction (DOI), reduces dead zones in detector and diminishes costs of detector production. Neural Networks (NN) are very efficient to determine the entrance point of a gamma incident on a scintillator block. This paper presents results on the robustness of the spatial resolution as a function of the random fraction in the data, temperature and HV fluctuations. This is important when implementing the method in a real scanner. Measurements were done with two Hamamatsu S8550 APD arrays, glued on a 20 Ã 20 Ã 10 mm3 monolithic LSO crystal block.
Y1 - 2009
SN - 1082-3654
SP - 2625
EP - 2628
ER -
TY - JOUR
A1 - Hüning, Felix
A1 - Hillgärtner, Michael
A1 - Reke, Michael
T1 - Rolling Labs – Teaching Vehicle Electronics from the Beginning
JF - International Journal of Engineering Pedagogy (iJEP)
Y1 - 2019
U6 - https://doi.org/10.3991/ijep.v9i1.9241
SN - 2192-4880
VL - 9
IS - 1
SP - 34
EP - 49
ER -
TY - JOUR
A1 - Wittmann, Klaus
A1 - Feuerbacher, B.
A1 - Ulamec, S.
A1 - Rosenbauer, H. (u.a.)
T1 - Rosetta Lander - In Situ Characterisation of a Comet Nucleus
JF - Acta Astronautica. 45 (1999), H. 4-9
Y1 - 1999
SN - 0094-5765
SP - 389
EP - 395
ER -
TY - JOUR
A1 - Wittmann, Klaus
A1 - Ulamec, S.
A1 - Feuerbacher, B.
A1 - Rosenbauer, H. (u.a.)
T1 - Rosetta Lander - In Situ Investigation of a Cometary Nucleus
JF - Lunar and Planetary Science. 28 (1997)
Y1 - 1997
SN - 0270-9511
N1 - Proceedings of the 28th Annual Lunar and Planetary Science Conference, March 17-21, 1997, Houston, Texas
SP - 1461
EP - 1462
ER -
TY - JOUR
A1 - Müller-Veggian, Mattea
A1 - Lieder, R. M.
A1 - Neskakis, A
T1 - Rotational bands in ¹⁹⁵,¹⁹⁷ Tl
JF - Nuclear physics / A. 299 (1978), H. 2
Y1 - 1978
SN - 0375-9474
SP - 255
EP - 284
ER -
TY - JOUR
A1 - Gaigall, Daniel
T1 - Rothman–Woodroofe symmetry test statistic revisited
JF - Computational Statistics & Data Analysis
N2 - The Rothman–Woodroofe symmetry test statistic is revisited on the basis of independent but not necessarily identically distributed random variables. The distribution-freeness if the underlying distributions are all symmetric and continuous is obtained. The results are applied for testing symmetry in a meta-analysis random effects model. The consistency of the procedure is discussed in this situation as well. A comparison with an alternative proposal from the literature is conducted via simulations. Real data are analyzed to demonstrate how the new approach works in practice.
Y1 - 2020
U6 - https://doi.org/10.1016/j.csda.2019.106837
SN - 0167-9473
VL - 2020
IS - 142
SP - Artikel 106837
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Wegner, Lena
A1 - von Arx, Georg
A1 - Sass-Klaassen, Ute G. W.
A1 - Eilmann, Britta
T1 - ROXAS – an efficient and accurate tool to detect vessels in diffuse-porous species
JF - IAWA Journal / International Association of Wood Anatomists
Y1 - 2013
U6 - https://doi.org/10.1163/22941932-00000034
SN - 0928-1541 (Print)
SN - 2294-1932 (Online)
VL - 34
IS - 4
SP - 425
EP - 432
PB - Brill
CY - Leiden
ER -
TY - JOUR
A1 - Hartung, Frank
A1 - Baldo, N.
A1 - Horn, U.
A1 - Kampmann, M.
T1 - RTCP feedback based transmission rate control for 3G wireless multimedia streaming / Baldo, N. ; Horn, U. ; Kampmann, M. ; Hartung, F. ;
JF - 15th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. Date:5-8 Sept. 2004 ; Vol. 3
Y1 - 2004
N1 - http://dx.doi.org/10.1109/PIMRC.2004.1368313
SP - 1817
EP - 1821
ER -
TY - JOUR
A1 - Fiedler, Thomas M.
A1 - Ladd, Mark E.
A1 - Clemens, Markus
A1 - Bitz, Andreas
T1 - Safety of subjects during radiofrequency exposure in ultra-high-field magnetic resonance imaging
JF - IEEE Letters on Electromagnetic Compatibility Practice and Applications
N2 - Magnetic resonance imaging (MRI) is one of the most important medical imaging techniques. Since the introduction of MRI in the mid-1980s, there has been a continuous trend toward higher static magnetic fields to obtain i.a. a higher signal-to-noise ratio. The step toward ultra-high-field (UHF) MRI at 7 Tesla and higher, however, creates several challenges regarding the homogeneity of the spin excitation RF transmit field and the RF exposure of the subject. In UHF MRI systems, the wavelength of the RF field is in the range of the diameter of the human body, which can result in inhomogeneous spin excitation and local SAR hotspots. To optimize the homogeneity in a region of interest, UHF MRI systems use parallel transmit systems with multiple transmit antennas and time-dependent modulation of the RF signal in the individual transmit channels. Furthermore, SAR increases with increasing field strength, while the SAR limits remain unchanged. Two different approaches to generate the RF transmit field in UHF systems using antenna arrays close and remote to the body are investigated in this letter. Achievable imaging performance is evaluated compared to typical clinical RF transmit systems at lower field strength. The evaluation has been performed under consideration of RF exposure based on local SAR and tissue temperature. Furthermore, results for thermal dose as an alternative RF exposure metric are presented.
Y1 - 2020
SN - 2637-6423
U6 - https://doi.org/10.1109/LEMCPA.2020.3029747
VL - 2
IS - 3
SP - 1
EP - 8
PB - IEEE
CY - New York, NY
ER -
TY - JOUR
A1 - Frotscher, Ralf
A1 - Muanghong, Danita
A1 - Dursun, Gözde
A1 - Goßmann, Matthias
A1 - Temiz Artmann, Aysegül
A1 - Staat, Manfred
T1 - Sample-specific adaption of an improved electro-mechanical model of in vitro cardiac tissue
JF - Journal of Biomechanics
N2 - We present an electromechanically coupled computational model for the investigation of a thin cardiac tissue construct consisting of human-induced pluripotent stem cell-derived atrial, ventricular and sinoatrial cardiomyocytes. The mechanical and electrophysiological parts of the finite element model, as well as their coupling are explained in detail. The model is implemented in the open source finite element code Code_Aster and is employed for the simulation of a thin circular membrane deflected by a monolayer of autonomously beating, circular, thin cardiac tissue. Two cardio-active drugs, S-Bay K8644 and veratridine, are applied in experiments and simulations and are investigated with respect to their chronotropic effects on the tissue. These results demonstrate the potential of coupled micro- and macroscopic electromechanical models of cardiac tissue to be adapted to experimental results at the cellular level. Further model improvements are discussed taking into account experimentally measurable quantities that can easily be extracted from the obtained experimental results. The goal is to estimate the potential to adapt the presented model to sample specific cell cultures.
KW - hiPS cardiomyocytes
KW - Homogenization
KW - Hodgkin–Huxley models
KW - Frequency adaption
KW - Electromechanical modeling
KW - Drug simulation
KW - Computational biomechanics
KW - Cardiac tissue
Y1 - 2016
U6 - https://doi.org/10.1016/j.jbiomech.2016.01.039
SN - 0021-9290 (Print)
SN - 1873-2380 (Online)
VL - 49
IS - 12
SP - 2428
EP - 2435
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Fiedler, Thomas M.
A1 - Ladd, Mark E.
A1 - Bitz, Andreas
T1 - SAR Simulations & Safety
JF - NeuroImage
Y1 - 2017
U6 - https://doi.org/10.1016/j.neuroimage.2017.03.035
SN - 1053-8119
IS - Epub ahead of print
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Rittweger, Jörn
A1 - Albracht, Kirsten
A1 - Flück, Martin
A1 - Ruoss, Severin
A1 - Brocca, Lorenza
A1 - Longa, Emanuela
A1 - Moriggi, Manuela
A1 - Seynnes, Olivier
A1 - Di Giulio, Irene
A1 - Tenori, Leonardo
A1 - Vignoli, Alessia
A1 - Capri, Miriam
A1 - Gelfi, Cecilia
A1 - Luchinat, Claudio
A1 - Franceschi, Claudio
A1 - Bottinelli, Roberto
A1 - Cerretelli, Paolo
A1 - Narici, Marco
T1 - Sarcolab pilot study into skeletal muscle’s adaptation to longterm spaceflight
JF - npj Microgravity
Y1 - 2018
U6 - https://doi.org/10.1038/s41526-018-0052-1
SN - 2373-8065
VL - 4
IS - 1
SP - 1
EP - 9
PB - Nature Portfolio
ER -
TY - JOUR
A1 - Hengsbach, Jan-Niklas
A1 - Engel, Mareike
A1 - Cwienczek, Marcel
A1 - Stiefelmaier, Judith
A1 - Tippkötter, Nils
A1 - Ulber, Roland
T1 - Scalable unseparated bioelectrochemical reactors by using a carbon fiber brush as stirrer and working electrode
JF - ChemElectroChem
N2 - The concept of energy conversion into platform chemicals using bioelectrochemical systems (BES) has gained increasing attention in recent years, as the technology simultaneously provides an opportunity for sustainable chemical production and tackles the challenge of Power-to-X technologies. There are many approaches to realize the industrial scale of BES. One concept is to equip standard bioreactors with static electrodes. However, large installations resulted in a negative influence on various reactor parameters. In this study, we present a new single-chamber BES based on a stirred tank reactor in which the stirrer was replaced by a carbon fiber brush, performing the functions of the working electrode and the stirrer. The reactor is characterized in abiotic studies and electro-fermentations with Clostridium acetobutylicum. Compared to standard reactors an increase in butanol production of 20.14±3.66 % shows that the new BES can be efficiently used for bioelectrochemical processes.
Y1 - 2023
U6 - https://doi.org/10.1002/celc.202300440
SN - 2196-0216
VL - 10
IS - 21
PB - Wiley-VCH
CY - Weinheim
ER -
TY - JOUR
A1 - Hillen, Walter
T1 - Scale braking in inclusive charged particle production by e--e+ annihilation. TASSO Collaboration
JF - Physics Letters B. 114 (1982), H. 1
Y1 - 1982
SN - 0370-2693
SP - 65
EP - 70
ER -
TY - JOUR
A1 - Müller-Veggian, Mattea
A1 - Garbe, S.
A1 - Nour, Y.
A1 - Wolf, K.
T1 - Scattered dose determination using the semiconductor diodes for a mask based whole brain radiotherapy (WBRT) with high-energy photons
JF - Biomedizinische Technik. 50 (2005), H. 2
Y1 - 2005
SN - 0932-4666
SP - 1069
EP - 1070
ER -
TY - JOUR
A1 - Schäfer, Horst
A1 - Shanjia, Xu
A1 - Xinzhang, Wu
A1 - Boege, P.
T1 - Scattering Characteristics of 3-D Discontinuity Consisting of Semiconductor Sample Filled in Waveguide with Gaps
JF - International Journal of Infrared and Millimeter Waves. 14 (1993), H. 10
Y1 - 1993
SN - 0195-9271
SP - 2155
EP - 2190
ER -
TY - JOUR
A1 - Heuermann, Holger
A1 - Schiek, Burkhard
T1 - Scattering Parameter Measurements of Microstrip Devices using the Double-LNN Calibration Technique
JF - Conference proceedings : [Palais des Festivals et des Congrès Cannes, France, 5 - 8 September 1994]
Y1 - 1994
SN - 0-9518032-5-5
N1 - European Microwave Conference <24, 1994, Cannes>
PB - Nexus Business Communications
CY - Swanley
ER -
TY - JOUR
A1 - Pilas, Johanna
A1 - Selmer, Thorsten
A1 - Keusgen, Michael
A1 - Schöning, Michael Josef
T1 - Screen-printed carbon electrodes modified with graphene oxide for the design of a reagent-free NAD+-dependent biosensor array
JF - Analytical Chemistry
Y1 - 2019
U6 - https://doi.org/10.1021/acs.analchem.9b04481
VL - 91
IS - 23
SP - 15293
EP - 15299
PB - ACS Publications
CY - Washington
ER -
TY - JOUR
A1 - Sponagel, Stefan
A1 - Kilthau, G.
A1 - Spies, K. H.
T1 - Sealing mechanism of lip seals
JF - Eleventh 11th International Conference on Fluid Sealing : proceedings of the 11th Internat. Conference on Fluid Sealing, held at Cannes, France 8 - 10 April, 1987 / organised and sponsored by BHRA, the Fluid Engineering Centre. Ed. B. S. Nau
Y1 - 1987
SN - 3-540-51383-3
N1 - International Conference on Fluid Sealing <11, 1987, Cannes>
SP - 748
EP - 772
PB - Elsevier
CY - London
ER -
TY - JOUR
A1 - Hillen, Walter
T1 - Search for new sequential leptons in e+e- annihilation at petra energies. TASSO Collaboration
JF - Physics Letters B. 99 (1981), H. 2
Y1 - 1981
SN - 0370-2693
SP - 163
EP - 168
ER -
TY - JOUR
A1 - Samm, Doris
A1 - Faissner, H.
A1 - Göttlicher, P.
A1 - Matela, H.
T1 - Search for scalar and pseudoscalar bosons emitted in nuclear decays via their interactions / Faissner, H.; Goettlicher, P. ; Matela, H. ; Samm, D.
JF - Zeitschrift für Physik A Hadrons and Nuclei. 341 (1992), H. 3
Y1 - 1992
SP - 359
EP - 364
ER -
TY - JOUR
A1 - Samm, Doris
A1 - Faissner, H.
A1 - Heinrigs, W.
A1 - Preussger, A.
T1 - Search for the two-photon decay of a light penetrating particle from a 590 MeV proton beam dump / Faissner, H.; Heinrigs, W.; Preussger, A.; Reitz, J.; Samm, D. [u.a.]
JF - Zeitschrift für Physik, C Particles and Fields. 44 (1989), H. 4
Y1 - 1989
SP - 557
EP - 566
ER -
TY - JOUR
A1 - Müller-Veggian, Mattea
A1 - Lieder, R. M.
A1 - Didelez, J. P.
T1 - Search for the yrast traps through the study of the α-decay after (α,Xn) reactions
JF - Annual report 1977 / Institut für Kernphysik Kernforschungsanlage Jülich
Y1 - 1978
N1 - Spezielle Berichte der Kernforschungsanlage Jülich ; 15
SP - 50
PB - Verlag des Forschungszentrums Jülich
CY - Jülich
ER -
TY - JOUR
A1 - Müller-Veggian, Mattea
A1 - Lieder, R. M.
A1 - Beuscher, H.
A1 - Gono, Y.
T1 - Search for yrast traps trough the study of and a decay after(a,xn) reactions
JF - Annual report 1976 / Institut für Kernphysik Kernforschungsanlage Jülich
Y1 - 1977
SP - 32
PB - Verlag des Forschungszentrums Jülich
CY - Jülich
ER -
TY - JOUR
A1 - Krebsbach, M.
A1 - Schiller, C.
A1 - Brunner, D.
A1 - Günther, G.
A1 - Hegglin, M. I.
A1 - Mottaghy, Darius
A1 - Riese, M.
A1 - Spelten, N.
A1 - Wernli, H.
T1 - Seasonal cycles and variability of O_3 and H_2O in the UT/LMS during SPURT
JF - Atmospheric Chemistry and Physics
Y1 - 2006
U6 - https://doi.org/10.5194/acp-6-109-2006
VL - 6
IS - 1
SP - 109
EP - 125
ER -
TY - JOUR
A1 - Scheele, Sandra
A1 - Oertel, Dan
A1 - Bongaerts, Johannes
A1 - Evers, Stefan
A1 - Hellmuth, Hendrik
A1 - Maurer, Karl-Heinz
A1 - Bott, Michael
A1 - Freudl, Roland
T1 - Secretory production of an FAD cofactor-containing cytosolic enzyme (sorbitol–xylitol oxidase from Streptomyces coelicolor) using the twin-arginine translocation (Tat) pathway of Corynebacterium glutamicum
JF - Microbial biotechnology
Y1 - 2013
SN - 1751-7915
SP - 202
EP - 206
PB - Wiley-Blackwell
CY - Oxford
ER -
TY - JOUR
A1 - Schuba, Marko
A1 - Wrona, Konrad
T1 - Security for Mobile Commerce Applications / Schuba, Marko ; Wrona, Konrad
Y1 - 2001
N1 - Multimedia, Internet, Video Technologies 2001 (MIV 2001), Malta, September 1-6, 2001 ; WSEAS Conference ; World Scientific and Engineering Academy and Society
SP - 1
EP - 8
ER -
TY - JOUR
A1 - Holtschoppen, Britta
A1 - Butenweg, Christoph
A1 - Meskouris, Konstantin
T1 - Seismic design of non-structural components in industrial facilities
JF - International journal of engineering under uncertainty
Y1 - 2009
SN - 0975-4806
VL - Volume 1
SP - 1
EP - 13
ER -
TY - JOUR
A1 - Butenweg, Christoph
A1 - Bursi, Oreste S.
A1 - Paolacci, Fabrizio
A1 - Marinković, Marko
A1 - Lanese, Igor
A1 - Nardin, Chiara
A1 - Quinci, Gianluca
ED - Yang, J.
T1 - Seismic performance of an industrial multi-storey frame structure with process equipment subjected to shake table testing
JF - Engineering Structures
N2 - Past earthquakes demonstrated the high vulnerability of industrial facilities equipped with complex process technologies leading to serious damage of process equipment and multiple and simultaneous release of hazardous substances. Nonetheless, current standards for seismic design of industrial facilities are considered inadequate to guarantee proper safety conditions against exceptional events entailing loss of containment and related consequences. On these premises, the SPIF project -Seismic Performance of Multi-Component Systems in Special Risk Industrial Facilities- was proposed within the framework of the European H2020 SERA funding scheme. In detail, the objective of the SPIF project is the investigation of the seismic behaviour of a representative industrial multi-storey frame structure equipped with complex process components by means of shaking table tests. Along this main vein and in a performance-based design perspective, the issues investigated in depth are the interaction between a primary moment resisting frame (MRF) steel structure and secondary process components that influence the performance of the whole system; and a proper check of floor spectra predictions. The evaluation of experimental data clearly shows a favourable performance of the MRF structure, some weaknesses of local details due to the interaction between floor crossbeams and process components and, finally, the overconservatism of current design standards w.r.t. floor spectra predictions.
KW - Multi-storey
KW - Frame structure
KW - Earthquake
KW - Tank
KW - Piping
Y1 - 2021
U6 - https://doi.org/10.1016/j.engstruct.2021.112681
SN - 0141-0296
VL - 243
IS - 15
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Mykoniou, Konstantin
A1 - Butenweg, Christoph
A1 - Holtschoppen, Britta
A1 - Klinkel, Sven
T1 - Seismic response analysis of adjacent liquid-storage tanks
JF - Earthquake engineering and structural dynamics
N2 - A refined substructure technique in the frequency domain is developed, which permits consideration of the interaction effects among adjacent containers through the supporting deformable soil medium. The tank-liquid systems are represented by means of mechanical models, whereas discrete springs and dashpots stand for the soil beneath the foundations. The proposed model is employed to assess the responses of adjacent circular, cylindrical tanks for harmonic and seismic excitations over wide range of tank proportions and soil conditions. The influence of the number, spatial arrangement of the containers and their distance on the overall system's behavior is addressed. The results indicate that the cross-interaction effects can substantially alter the impulsive components of response of each individual element in a tank farm. The degree of this impact is primarily controlled by the tank proportions and the proximity of the predominant natural frequencies of the shell-liquid-soil systems and the input seismic motion. The group effects should be not a priori disregarded, unless the tanks are founded on shallow soil deposit overlying very stiff material or bedrock.
KW - liquid-structure interaction
KW - seismic response
KW - impulsive effects
KW - liquid-storage tank
KW - structure-soil-structure interaction
Y1 - 2016
U6 - https://doi.org/10.1002/eqe.2726
SN - 1096-9845 (E-Journal); 0098-8847 (Print)
VL - 45
IS - 11
SP - 1779
EP - 1796
PB - Wiley-VCH
CY - Weinheim
ER -
TY - JOUR
A1 - Givanoudi, Stella
A1 - Cornelis, Peter
A1 - Rasschaert, Geertrui
A1 - Wackers, Gideon
A1 - Iken, Heiko
A1 - Rolka, David
A1 - Yongabi, Derick
A1 - Robbens, Johan
A1 - Schöning, Michael Josef
A1 - Heyndrickx, Marc
A1 - Wagner, Patrick
T1 - Selective Campylobacter detection and quantification in poultry: A sensor tool for detecting the cause of a common zoonosis at its source
JF - Sensors and Actuators B: Chemical
Y1 - 2021
U6 - https://doi.org/10.1016/j.snb.2021.129484
SN - 0925-4005
IS - In Press, Journal Pre-proof
SP - Article 129484
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Kotter, Michael
A1 - Lintz, Hans-Günther
A1 - Turek, Thomas
T1 - Selective catalytic reduction of nitrogen oxide by use of the Ljungstroem air heater as reactor : a case study
JF - Chemical engineering science . 47 (1992), H. 9-11
Y1 - 1992
SN - 0009-2509
SP - 2763
EP - 2768
ER -
TY - JOUR
A1 - Hötter, Jan-Steffen
A1 - Fateri, Miranda
A1 - Gebhardt, Andreas
T1 - Selective laser melting of metals: desktop machines open up new chances even for small companies
JF - Advanced materials research
N2 - Additive manufacturing (AM) of metal parts by using Selective Laser Melting (SLM) has become a powerful tool mostly in the area of automotive, aerospace engineering and others. Especially in the field of dentistry, jewelry and related branches that require individualized or even one-of-a-kind products, the direct digital manufacturing process opens up new ways of design and manufacturing. In these fields, mostly small and medium sized businesses (SME) are operating which do not have sufficient human and economic resources to invest in this technology. But to stay competitive, the application of AM can be regarded as a necessity. In this situation a new desktop machine (Realizer SLM 50) was introduced that cost about 1/3 of a shop floor SLM machine and promises small quality parts. To find out whether the machine really is an alternative for SMEs the University of Applied Science, Aachen, Germany, designed, build and optimized typical parts from the dentistry and the jewelry branches using CoCr and silver material, the latter being new with this application. The paper describes the SLM procedure and how to find and optimize the most important parameters. The test is accompanied by digital simulation in order to verify the build parameters and to plan future builds. The procedure is shown as well as the resulting parts made from CoCr and silver material.
Y1 - 2012
U6 - https://doi.org/10.4028/www.scientific.net/AMR.622-623.461
SN - 1662-8985 (E-Journal); 1022-6680 (Print)
VL - 622-623
SP - 461
EP - 465
PB - Trans Tech Publ.
CY - Baech
ER -
TY - JOUR
A1 - Fateri, Miranda
A1 - Gebhardt, Andreas
T1 - Selective Laser Melting of Soda-Lime Glass Powder
JF - International Journal of Applied Ceramic Technology
Y1 - 2015
U6 - https://doi.org/10.1111/ijac.12338
SN - 1744-7402
VL - 12
IS - 1
SP - 53
EP - 61
PB - Wiley-Blackwell
CY - Oxford
ER -
TY - JOUR
A1 - Rieper, Harald
A1 - Gebhardt, Andreas
A1 - Stucker, Brent
T1 - Selective Laser Melting of the Eutectic Silver-Copper Alloy Ag 28 wt % Cu
JF - RTejournal - Forum für Rapid Technologie
N2 - The aim of this work was to perform a detailed investigation of the use of Selective Laser Melting (SLM) technology to process eutectic silver-copper alloy Ag 28 wt. % Cu (also called AgCu28). The processing occurred with a Realizer SLM 50 desktop machine. The powder analysis (SEM-topography, EDX, particle distribution) was reported as well as the absorption rates for the near-infrared (NIR) spectrum. Microscope imaging showed the surface topography of the manufactured parts. Furthermore, microsections were conducted for the analysis of porosity. The Design of Experiments approach used the response surface method in order to model the statistical relationship between laser power, spot distance and pulse time.
KW - SLM
KW - Response Surface Method
KW - Porositat
KW - Eutectic Silver Copper alloy
KW - Additive Manufacturing
Y1 - 2016
U6 - http://nbn-resolving.de/urn/resolver.pl?nbn:de:0009-2-44141
SN - 1614-0923
VL - 13
ER -
TY - JOUR
A1 - Müller-Veggian, Mattea
A1 - Haenni, D. R.
A1 - Beuscher, H.
A1 - Bochev, B.
T1 - Selectivity of a sum spectrometer for (a,xn) reaction
JF - Annual report 1979 / Kernforschungsanlage Jülich Institut für Kernphysik / Hrsg.: A. Fässler. - (Spezielle Berichte der Kernforschungsanlage Jülich ; 72)
Y1 - 1980
SP - 49
PB - Kernforschungsanlage
CY - Jülich
ER -
TY - JOUR
A1 - Prielmeier, Franz
A1 - Lüdemann, H.-D.
T1 - Self diffusion in compressed liquid chloromethane, dichloromethane and trichloromethane / F. X. Prielmeier; H.-D. Lüdemann
JF - Molecular Physics. 58 (1986), H. 3
Y1 - 1986
SN - 0026-8976
SP - 593
EP - 604
ER -
TY - JOUR
A1 - Stulpe, Werner
T1 - Self-Adjoint Operator
JF - Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.
Y1 - 2009
SN - 978-3-540-70622-9
SP - 692
EP - 697
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Spelthahn, Heiko
A1 - Poghossian, Arshak
A1 - Schöning, Michael Josef
T1 - Self-aligned nanogaps and nanochannels via conventional photolithography and pattern-size reduction technique
JF - Electrochimica Acta. 54 (2009), H. 25 Sp. Iss. SI
Y1 - 2009
SN - 0013-4686
SP - 6010
EP - 6014
ER -
TY - JOUR
A1 - de Blois, Eric
A1 - de Zanger, Rory M. S.
A1 - Paulßen, Elisabeth
A1 - Sze Chan, Ho
A1 - Breeman, Wouter A. P.
T1 - Semi-automated system for concentrating 68Ga-eluate to obtain high molar and volume concentration of 68Ga-Radiopharmaca for preclinical applications
JF - Nuclear Medicine and Biology
N2 - 68Ga-radiopharmaceuticals are common in the field of Nuclear Medicine to visualize receptor-mediated processes. In contrast to straightforward labeling procedures for clinical applications, preclinical in vitro and in vivo applications are hampered for reasons like e.g. volume
restriction, activity concentration, molar activity and osmolality. Therefore, we developed a semiautomatic system specifically to overcome these problems. A difficulty appeared unexpectedly, as intrinsic trace metals derived from eluate (Zn, Fe and Cu) are concentrated as well in amounts that influence radiochemical yield and thus lower molar activity.
Y1 - 2018
U6 - https://doi.org/10.1016/j.nucmedbio.2018.06.006
VL - 64-65
SP - 16
EP - 21
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Pawelke, Siegfried
A1 - Butzer, Paul L.
T1 - Semi-groups and resolvent operators
JF - Archive for Rational Mechanics and Analysis
KW - Resolvent Operator
KW - Electromagnetism
KW - Complex System
KW - Neural Network
KW - Nonlinear Dynamics
Y1 - 1968
U6 - https://doi.org/10.1007/BF00250941
SN - 0003-9527
VL - 30
IS - 2
SP - 127
EP - 147
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Förster, Arnold
A1 - Kordos, P.
A1 - Betko, J.
T1 - Semi-insulating GaAs layers grown by molecular-beam epitaxy / P. Kordos ; A. Förster ; J. Betko ...
JF - Applied physics letters. 67 (1995), H. 7
Y1 - 1995
SN - 0003-6951
N1 - ISSN der E-Ausg.: 1077-3118
SP - 983
EP - 985
ER -
TY - JOUR
A1 - Dikta, Gerhard
T1 - Semi-parametric random censorship models
JF - From Statistics to Mathematical Finance : Festschrift in Honour of Winfried Stute
Y1 - 2017
SN - 978-3-319-50986-0
U6 - https://doi.org/10.1007/978-3-319-50986-0_3
SP - 43
EP - 56
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Dikta, Gerhard
A1 - Reißel, Martin
A1 - Harlaß, Carsten
T1 - Semi-parametric survival function estimators deduced from an identifying Volterra type integral equation
JF - Journal of multivariate analysis
N2 - Based on an identifying Volterra type integral equation for randomly right censored observations from a lifetime distribution function F, we solve the corresponding estimating equation by an explicit and implicit Euler scheme. While the first approach results in some known estimators, the second one produces new semi-parametric and pre-smoothed Kaplan–Meier estimators which are real distribution functions rather than sub-distribution functions as the former ones are. This property of the new estimators is particular useful if one wants to estimate the expected lifetime restricted to the support of the observation time.
Specifically, we focus on estimation under the semi-parametric random censorship model (SRCM), that is, a random censorship model where the conditional expectation of the censoring indicator given the observation belongs to a parametric family. We show that some estimated linear functionals which are based on the new semi-parametric estimator are strong consistent, asymptotically normal, and efficient under SRCM. In a small simulation study, the performance of the new estimator is illustrated under moderate sample sizes. Finally, we apply the new estimator to a well-known real dataset.
KW - Volterra integral equation
KW - Product-integration
KW - Asymptotic efficiency
KW - Semi-parametric random censorship model
KW - Censored data
KW - Survival analysis
Y1 - 2016
U6 - https://doi.org/10.1016/j.jmva.2016.02.008
IS - 147
SP - 273
EP - 284
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Schöning, Michael Josef
A1 - Poghossian, Arshak
A1 - Yoshinobu, Tatsuo
A1 - Lüth, Hans
T1 - Semiconductor-based field-effect structures for chemical sensing
Y1 - 2001
SP - 188
EP - 198
ER -
TY - JOUR
A1 - Poghossian, Arshak
A1 - Abouzar, Maryam H.
A1 - Christiaens, P.
A1 - Williams, O. A.
A1 - Haenen, K.
A1 - Wagner, Patrick
A1 - Schöning, Michael Josef
T1 - Sensing charged macromolecules with nanocrystalline diamond-based field-effect capacitive sensors
JF - Journal of Contemporary Physics. 43 (2008), H. 2
Y1 - 2008
SN - 1934-9378
N1 - Armenian Academy of Sciences
SP - 77
EP - 81
ER -
TY - JOUR
A1 - Wu, Chunsheng
A1 - Poghossian, Arshak
A1 - Bronder, Thomas
A1 - Schöning, Michael Josef
T1 - Sensing of double-stranded DNA molecules by their intrinsic molecular charge using the light-addressable potentiometric sensor
JF - Sensors and Actuators B: Chemical
N2 - A multi-spot light-addressable potentiometric sensor (LAPS), which belongs to the family of semiconductor field-effect devices, was applied for label-free detection of double-stranded deoxyribonucleic acid (dsDNA) molecules by their intrinsic molecular charge. To reduce the distance between the DNA charge and sensor surface and thus, to enhance the electrostatic coupling between the dsDNA molecules and the LAPS, the negatively charged dsDNA molecules were electrostatically adsorbed onto the gate surface of the LAPS covered with a positively charged weak polyelectrolyte layer of PAH (poly(allylamine hydrochloride)). The surface potential changes in each spot of the LAPS, induced by the layer-by-layer adsorption of a PAH/dsDNA bilayer, were recorded by means of photocurrent-voltage and constant-photocurrent measurements. In addition, the surface morphology of the gate surface before and after consecutive electrostatic adsorption of PAH and dsDNA layers was studied by atomic force microscopy measurements. Moreover, fluorescence microscopy was used to verify the successful adsorption of dsDNA molecules onto the PAH-modified LAPS surface. A high sensor signal of 25 mV was registered after adsorption of 10 nM dsDNA molecules. The lower detection limit is down to 0.1 nM dsDNA. The obtained results demonstrate that the PAH-modified LAPS device provides a convenient and rapid platform for the direct label-free electrical detection of in-solution hybridized dsDNA molecules.
KW - Layer-by-layer adsorption
KW - Poly(allylamine hydrochloride)
KW - Label-free detection
KW - DNA biosensor
KW - LAPS
KW - Field effect
Y1 - 2016
U6 - https://doi.org/10.1016/j.snb.2016.02.004
SN - 0925-4005
IS - 229
SP - 506
EP - 512
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Krause, Gregor
A1 - Schuppe, W.D.
A1 - Saure, M.
A1 - Andress, H.
T1 - Sensitive Analytical and Physical Methods for Diagnosis of Variations in Polyolefin Plaques and Cable Insulations / W.D. Schuppe, M. Saure, H. Andress, K. Möller, D. Meurer, G. Krause
JF - Proceedings of the 32nd session : 28th August - 3rd September.
Y1 - 1988
N1 - International Conference on Large Electric Systems, CIGRÉ <32, Paris, 1988>
ER -
TY - JOUR
A1 - Achtsnicht, Stefan
A1 - Neuendorf, Christian
A1 - Faßbender, Tobias
A1 - Nölke, Greta
A1 - Offenhäusser, Andreas
A1 - Krause, Hans-Joachim
A1 - Schröper, Florian
T1 - Sensitive and rapid detection of cholera toxin subunit B using magnetic frequency mixing detection
JF - Plos One
N2 - Cholera is a life-threatening disease caused by the cholera toxin (CT) as produced by some Vibrio cholerae serogroups. In this research we present a method which directly detects the toxin’s B subunit (CTB) in drinking water. For this purpose we performed a magnetic sandwich immunoassay inside a 3D immunofiltration column. We used two different commercially available antibodies to capture CTB and for binding to superparamagnetic beads. ELISA experiments were performed to select the antibody combination. The beads act as labels for the magnetic frequency mixing detection technique. We show that the limit of detection depends on the type of magnetic beads. A nonlinear Hill curve was fitted to the calibration measurements by means of a custom-written python software. We achieved a sensitive and rapid detection of CTB within a broad concentration range from 0.2 ng/ml to more
than 700 ng/ml.
Y1 - 2019
U6 - https://doi.org/10.1371/journal.pone.0219356
SN - 1932-6203
VL - 14
IS - 7
PB - Plos
CY - San Francisco
ER -
TY - JOUR
A1 - Cornelis, Peter
A1 - Givanoudi, Stella
A1 - Yongabi, Derick
A1 - Iken, Heiko
A1 - Duwé, Sam
A1 - Deschaume, Olivier
A1 - Robbens, Johan
A1 - Dedecker, Peter
A1 - Bartic, Carmen
A1 - Wübbenhorst, Michael
A1 - Schöning, Michael Josef
A1 - Heyndrickx, Marc
A1 - Wagner, Patrick
T1 - Sensitive and specific detection of E. coli using biomimetic receptors in combination with a modified heat-transfer method
JF - Biosensors and Bioelectronics
Y1 - 2019
U6 - https://doi.org/10.1016/j.bios.2019.04.026
SN - 0956-5663
VL - 136
SP - 97
EP - 105
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Dikta, Gerhard
A1 - Degenring, D.
A1 - Froemmel, C.
A1 - Takors, R.
T1 - Sensitivity analysis for the reduction of complex metabolism models / Degenring, D. ; Froemmel, C. ; Dikta, G.; Takors, R.
JF - Journal of Process Control. 14 (2004)
Y1 - 2004
SN - 0959-1524
SP - 729
EP - 745
ER -
TY - JOUR
A1 - Staat, Manfred
T1 - Sensitivity of and Influences on the Reliability of an HTR-Module Primary Circuit Pressure Boundary
JF - Transactions of the 12th International Conference on Structural Mechanics in Reactor Technology (SMiRT-12) / Kussmaul, K. [ed]
Y1 - 1993
SN - 0-444-81515-5
N1 - Vol. M, Paper MG10/2
SP - 147
EP - 152
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Bühler, Yves
A1 - Christen, Marc
A1 - Kowalski, Julia
A1 - Bartelt, Perry
T1 - Sensitivity of snow avalanche simulations to digital elevation model quality and resolution
JF - Annals of Glaciology
N2 - Digital elevation models (DEMs), represent the three-dimensional terrain and are the basic input for numerical snow avalanche dynamics simulations. DEMs can be acquired using topographic maps or remote-sensing technologies, such as photogrammetry or lidar. Depending on the acquisition technique, different spatial resolutions and qualities are achieved. However, there is a lack of studies that investigate the sensitivity of snow avalanche simulation algorithms to the quality and resolution of DEMs. Here, we perform calculations using the numerical avalance dynamics model RAMMS, varying the quality and spatial resolution of the underlying DEMs, while holding the simulation parameters constant. We study both channelized and open-terrain avalanche tracks with variable roughness. To quantify the variance of these simulations, we use well-documented large-scale avalanche events from Davos, Switzerland (winter 2007/08), and from our large-scale avalanche test site, Valĺee de la Sionne (winter 2005/06). We find that the DEM resolution and quality is critical for modeled flow paths, run-out distances, deposits, velocities and impact pressures. Although a spatial resolution of ~25 m is sufficient for large-scale avalanche modeling, the DEM datasets must be checked carefully for anomalies and artifacts before using them for dynamics calculations.
KW - snow
KW - avalanche
Y1 - 2011
SN - 1727-5644
VL - 52
IS - 58
SP - 72
EP - 80
PB - Cambridge University Press
CY - Cambridge
ER -
TY - JOUR
A1 - Valero, Daniel
A1 - Bung, Daniel Bernhard
T1 - Sensitivity of turbulent Schmidt number and turbulence model to simulations of jets in crossflow
JF - Environmental Modelling and Software
N2 - Environmental discharges have been traditionally designed by means of cost-intensive and time-consuming experimental studies. Some extensively validated models based on an integral approach have been often employed for water quality problems, as recommended by USEPA (i.e.: CORMIX). In this study, FLOW-3D is employed for a full 3D RANS modelling of two turbulent jet-to-crossflow cases, including free surface jet impingement. Results are compared to both physical modelling and CORMIX to better assess model performance. Turbulence measurements have been collected for a better understanding of turbulent diffusion's parameter sensitivity. Although both studied models are generally able to reproduce jet trajectory, jet separation downstream of the impingement has been reproduced only by RANS modelling. Additionally, concentrations are better reproduced by FLOW-3D when the proper turbulent Schmidt number is used. This study provides a recommendation on the selection of the turbulence model and the turbulent Schmidt number for future outfall structures design studies.
Y1 - 2016
U6 - https://doi.org/10.1016/j.envsoft.2016.04.030
SN - 1364-8152 (electronic)
VL - 82
SP - 218
EP - 228
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Schusser, Sebastian
A1 - Krischer, M.
A1 - Molin, D. G. M.
A1 - Akker, N. M. S. van den
A1 - Bäcker, Matthias
A1 - Poghossian, Arshak
A1 - Schöning, Michael Josef
T1 - Sensor System for in-situ and Real-time Monitoring of Polymer (bio) degradation
JF - Procedia Engineering
N2 - A sensor system for investigating (bio)degradationprocesses of polymers is presented. The system utilizes semiconductor field-effect sensors and is capable of monitoring the degradation process in-situ and in real-time. The degradation of the polymer poly(d,l-lactic acid) is exemplarily monitored in solutions with different pH value, pH-buffer solution containing the model enzyme lipase from Rhizomucormiehei and cell-culture medium containing supernatants from stimulated and non-stimulated THP-1-derived macrophages mimicking activation of the immune system.
Y1 - 2015
U6 - https://doi.org/10.1016/j.proeng.2015.08.815
SN - 1877-7058
N1 - Eurosensors 2015
VL - 120
SP - 948
EP - 951
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Dikta, Gerhard
A1 - Kurtz, B.
A1 - Stute, W.
T1 - Sequential Fixed-Width Confidence Bands for Distribution Functions Under Random Censoring
JF - Metrika. 36 (1989)
Y1 - 1989
SN - 0026-1335
SP - 167
EP - 176
ER -
TY - JOUR
A1 - Kämper, Klaus-Peter
A1 - Berg, U.
A1 - Begemann, M.
A1 - Hagemann, B. (u.a.)
T1 - Series production and testing of a micro motor. Serienfertigung und Prüfung eines Mikromotors
JF - Actuator 98 : 6th International Conference on New Actuators ; 17 - 19 June, 1998, Bremen, Germany ; conference proceedings / ed.: Hubert Borgmann ...
Y1 - 1998
SN - 3-933339-00-6
N1 - Konferenz-Einzelbericht: ACTUATOR, Internat. Conf. on New Actuators
SP - 552
EP - 555
PB - Messe Bremen
CY - Bremen
ER -
TY - JOUR
A1 - Czarnecki, Christian
A1 - Winkelmann, Axel
A1 - Spiliopoulou, Myra
T1 - Services in electronic telecommunication markets: a framework for planning the virtualization of processes
JF - Electronic Markets
N2 - The potential of electronic markets in enabling innovative product bundles through flexible and sustainable partnerships is not yet fully exploited in the telecommunication industry. One reason is that bundling requires seamless de-assembling and re-assembling of business processes, whilst processes in telecommunication companies are often product-dependent and hard to virtualize. We propose a framework for the planning of the virtualization of processes, intended to assist the decision maker in prioritizing the processes to be virtualized: (a) we transfer the virtualization pre-requisites stated by the Process Virtualization Theory in the context of customer-oriented processes in the telecommunication industry and assess their importance in this context, (b) we derive IT-oriented requirements for the removal of virtualization barriers and highlight their demand on changes at different levels of the organization. We present a first evaluation of our approach in a case study and report on lessons learned and further steps to be performed.
KW - Telecommunication
KW - Services
KW - Process virtualization
KW - Product bundling
KW - Transformation
Y1 - 2010
U6 - https://doi.org/10.1007/s12525-010-0045-8
SN - 1422-8890
VL - 20
IS - 3-4
SP - 197
EP - 207
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Nachtrodt, Frederik
A1 - Tietsch, Wolfgang
A1 - Mostacci, Domiziano
A1 - Scherer, Ulrich W.
T1 - Set-up and first operation of a plasma oven for treatment of low level radioactive wastes
JF - Nuclear technology and radiation protection
Y1 - 2014
U6 - https://doi.org/10.2298/NTRP140SS47N
SN - 1451-3994
VL - 29
IS - Suppl.
SP - 47
EP - 51
PB - VINČA Institute of Nuclear Sciences
CY - Belgrad
ER -
TY - JOUR
A1 - Umutlu, Lale
A1 - Kraff, Oliver
A1 - Fischer, Anja
A1 - Kinner, Sonja
A1 - Maderwald, Stefan
A1 - Nassenstein, Kai
A1 - Nensa, Felix
A1 - Grüneisen, Johannes
A1 - Orzada, Stephan
A1 - Bitz, Andreas
A1 - Forsting, Michael
A1 - Ladd, Mark E.
A1 - Lauenstein, Thomas C.
T1 - Seven-Tesla MRI of the female pelvis
JF - European Radiology
Y1 - 2013
U6 - https://doi.org/10.1007/s00330-013-2868-0
SN - 1432-1084
VL - 23
IS - 9
SP - 2364
EP - 2373
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Vu, Duc Khoi
A1 - Staat, Manfred
T1 - Shakedown analysis of structures made of materials with temperature-dependent yield stress
JF - International Journal of Solids and Structures. 44 (2007), H. 13
Y1 - 2007
SN - 0020-7683
SP - 4524
EP - 4540
ER -
TY - JOUR
A1 - Tran, Thanh Ngoc
A1 - Staat, Manfred
T1 - Shakedown analysis of two dimensional structures by an edge-based smoothed finite element method
Y1 - 2010
N1 - ECCM 2010, IV European Conference on Computational Mechanics, Paris, France, May 16-21, 2010.
SP - 1
EP - 7
ER -
TY - JOUR
A1 - Staat, Manfred
T1 - Shakedown and ratchetting under tension-torsion loadings: analysis and experiments
N2 - Structural design analyses are conducted with the aim of verifying the exclusion of ratchetting. To this end it is important to make a clear distinction between the shakedown range and the ratchetting range. The performed experiment comprised a hollow tension specimen which was subjected to alternating axial forces, superimposed with constant moments. First, a series of uniaxial tests has been carried out in order to calibrate a bounded kinematic hardening rule. The load parameters have been selected on the basis of previous shakedown analyses with the PERMAS code using a kinematic hardening material model. It is shown that this shakedown analysis gives reasonable agreement between the experimental and the numerical results. A linear and a nonlinear kinematic hardening model of two-surface plasticity are compared in material shakedown analysis.
KW - Einspielen
KW - Einspielen
KW - Ratchetting
KW - Zug-Druck Belastung
KW - shakedown
KW - ratchetting
KW - tension–torsion loading
Y1 - 2003
ER -
TY - JOUR
A1 - Staat, Manfred
A1 - Heitzer, M.
A1 - Reiners, H.
A1 - Schubert, F.
T1 - Shakedown and ratchetting under tension–torsion loadings: analysis and experiments
JF - Nuclear Engineering and Design. 225 (2003), H. 1
Y1 - 2003
SN - 0029-5493
SP - 11
EP - 26
ER -
TY - JOUR
A1 - Kowalski, Julia
A1 - McElwaine, Jim N.
T1 - Shallow two-component gravity-driven flows with vertical variation
JF - Journal of Fluid Mechanics
Y1 - 2013
SN - 0022-1120
VL - 714
SP - 434
EP - 462
PB - Cambridge Univ. Press
CY - Cambridge
ER -
TY - JOUR
A1 - Turdumamatov, Samat
A1 - Belda, Aljoscha
A1 - Heuermann, Holger
T1 - Shaping a decoupled atmospheric pressure microwave plasma with antenna structures, Maxwell’s equations, and boundary conditions
JF - IEEE Transactions on Plasma Science
N2 - This article addresses the need for an innovative technique in plasma shaping, utilizing antenna structures, Maxwell’s laws, and boundary conditions within a shielded environment. The motivation lies in exploring a novel approach to efficiently generate high-energy density plasma with potential applications across various fields. Implemented in an E01 circular cavity resonator, the proposed method involves the use of an impedance and field matching device with a coaxial connector and a specially optimized monopole antenna. This setup feeds a low-loss cavity resonator, resulting in a high-energy density air plasma with a surface temperature exceeding 3500 o C, achieved with a minimal power input of 80 W. The argon plasma, resembling the shape of a simple monopole antenna with modeled complex dielectric values, offers a more energy-efficient alternative compared to traditional, power-intensive plasma shaping methods. Simulations using a commercial electromagnetic (EM) solver validate the design’s effectiveness, while experimental validation underscores the method’s feasibility and practical implementation. Analyzing various parameters in an argon atmosphere, including hot S -parameters and plasma beam images, the results demonstrate the successful application of this technique, suggesting its potential in coating, furnace technology, fusion, and spectroscopy applications.
KW - 3-D printing
KW - Furnace
KW - Fusion
KW - Hot S-parameter
KW - Mode converter
Y1 - 2024
U6 - https://doi.org/10.1109/TPS.2024.3383589
SN - 0093-3813 (Print)
SN - 1939-9375 (Online)
IS - Early Access
SP - 1
EP - 9
PB - IEEE
ER -
TY - JOUR
A1 - Keller, Johannes
A1 - Rath, Volker
A1 - Bruckmann, Johanna
A1 - Mottaghy, Darius
A1 - Clauser, Christoph
A1 - Wolf, Andreas
A1 - Seidler, Ralf
A1 - Bücker, H. Martin
A1 - Klitzsch, Norbert
T1 - SHEMAT-Suite: An open-source code for simulating flow, heat and species transport in porous media
JF - SoftwareX
N2 - SHEMAT-Suite is a finite-difference open-source code for simulating coupled flow, heat and species transport in porous media. The code, written in Fortran-95, originates from geoscientific research in the fields of geothermics and hydrogeology. It comprises: (1) a versatile handling of input and output, (2) a modular framework for subsurface parameter modeling, (3) a multi-level OpenMP parallelization, (4) parameter estimation and data assimilation by stochastic approaches (Monte Carlo, Ensemble Kalman filter) and by deterministic Bayesian approaches based on automatic differentiation for calculating exact (truncation error-free) derivatives of the forward code.
Y1 - 2020
U6 - https://doi.org/10.1016/j.softx.2020.100533
SN - 2352-7110
VL - 12
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Kern, Alexander
A1 - Zischank, Wolfgang J.
A1 - Heidler, Fridolin
A1 - Wiesinger, J. [u.a.]
T1 - Shielding effectiveness of reinforced concrete cable ducts carrying partial lightning currents
JF - Conference proceedings : 14th - 18th September 1998, [Burlington Hotel, Birmingham, United Kingdom] / organised by: School of Engineering and Advanced Technology, Staffordshire University, United Kingdom
Y1 - 1998
N1 - International Conference on Lightning Protection <24, 1998, Birmingham> ; School of Engineering and Advanced Technology ; ICLP <4, 1998, Birmingham>
CY - Birmingham
ER -
TY - JOUR
A1 - Reisgen, Uwe
A1 - Schleser, Markus
A1 - Mokrov, Oleg
A1 - Ahmed, Essam
T1 - Shielding gas influences on laser weldability of tailored blanks of advanced automotive steels
JF - Applied surface science
N2 - The effects of shielding gas types and flow rates on CO2 laser weldability of DP600/TRIP700 steel sheets were studied in this work. The evaluated shielding gases were helium (He), argon (Ar) and different mixtures of He and Ar. Weld penetration, tensile strength and formability (Erichsen test) of laser welds were found to be strongly dependent upon the shielding gas types. The ability of shielding gas in removing plasma plume and thus increasing weld penetration is believed to be closely related to ionization potential and atomic weight which determine the period of plasma formation and disappearance. It was found that the higher helium shielding gas flow rate, the deeper weld penetration and the lower weld width.
Y1 - 2010
U6 - https://doi.org/10.1016/j.apsusc.2010.08.042
SN - 0169-4332 (E-Journal); 0169-4332 (Print)
VL - 257
IS - 5
SP - 1401
EP - 1406
PB - Elsevier
CY - Amsterdam
ER -