@article{Morawetz2024, author = {Morawetz, Klaus}, title = {Time behavior of hubble parameter by torsion}, series = {Modern Physics Letters A}, volume = {Vol. 39}, journal = {Modern Physics Letters A}, number = {No. 3}, doi = {10.1142/S0217732323501924}, pages = {2350192-1 -- 2350192-10}, year = {2024}, abstract = {Consequences of the consistent exact solution of Einstein{Cartan equation on the time dependence of Hubble parameter are discussed. The torsion leads to a space and time-dependent expansion parameter which results into nontrivial windows of Hubble parameter between diverging behavior. Only one window shows a period of decreasing followed by increasing time dependence. Provided a known cosmological constant and the present values of Hubble and deceleration parameter this changing time can be given in the past as well as the ending time of the windows or universe. The comparison with the present experimental data allows to determine all parameters of the model. Large-scale spatial periodic structures appear. From the metric with torsion outside matter, it is seen that torsion can feign dark matter.}, language = {en} } @article{Morawetz2023, author = {Morawetz, Klaus}, title = {Extended quasiparticle Pad{\´e} approximation for non-Fermi liquids}, doi = {10.25974/fhms-17712}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-177120}, pages = {1 -- 16}, year = {2023}, abstract = {The extended quasiparticle picture is adapted to non-Fermi systems by suggesting a Pad´e approximation which interpolates between the known small scattering-rate expansion and the deviation from the Fermi energy. The first two energy-weighted sum rules are shown to be fulfilled independent of the interpolating function for any selfenergy. For various models of one-dimensional Fermions scattering with impurities the quality of the Pad´e approximation for the spectral function is demonstrated and the reduced density matrix or momentum distribution is reproduced not possessing a jump at the Fermi energy. Though the two-fold expansion is necessary to realize the spectral function and reduced density, the extended quasiparticle approximation itself is sufficient for the description of transport properties due to cancellation of divergent terms under integration. The T-matrix approximation leads to the delay time as the time two particles spend in a correlated state. This contributes to the reduced density matrix and to an additional part in the conductivity which is presented at zero and finite temperatures. Besides a localization at certain impurity concentrations, the conductivity shows a maximum at small temperatures interpreted as onset of superconducting behaviour triggered by impurities. The Tan contact reveals the same universal behaviour as known from electron-electron scattering.}, language = {en} } @article{KielTrinschekKuchmizhaketal.2024, author = {Kiel, Frederik and Trinschek, Sarah and Kuchmizhak, Aleksandr and Gurevich, Evgeny}, title = {Colouration of diamond surfaces by laser-induced periodic surface structuring}, series = {Optics \& Laser Technology}, journal = {Optics \& Laser Technology}, number = {168}, doi = {10.1016/j.optlastec.2023.109882}, pages = {109882}, year = {2024}, language = {en} } @inproceedings{CarlHochmann2021, author = {Carl, Ann-Kathrin and Hochmann, David}, title = {Regulatory Framework for 3D Printed Custom-Made Devices in Europe}, series = {Beitrag zur 3. Additive Manufacturing Meets Medicine (AMMM) Konferenz}, booktitle = {Beitrag zur 3. Additive Manufacturing Meets Medicine (AMMM) Konferenz}, issn = {2699-1977}, doi = {10.18416/AMMM.2021.2109542}, year = {2021}, abstract = {Additive manufacturing (AM) has been growing continuously over the past 20 years, enabling unprecedented tailoring to the anatomy of each patient. In Europe, custom-made devices qualify for an exemption and pass a simplified approval process. New technologies, like AM, provoke questions about the adequacy of the current regulatory framework for custom-made devices. This article addresses the regulatory requirements for such devices in Europe and discusses the implications for AM. It concludes that the legal framework for custom-made devices entails uncertainties which need to be resolved to guide manufacturers through the regulatory requirements, highlighting the specific areas of focus for AM.}, language = {en} } @article{CarlHochmann2022, author = {Carl, Ann-Kathrin and Hochmann, David}, title = {Comparison of the regulatory requirements for custom-made medical devices using 3D printing in Europe, the United States, and Australia}, series = {Biomedical Engineering / Biomedizinische Technik}, volume = {67}, journal = {Biomedical Engineering / Biomedizinische Technik}, number = {6}, issn = {1862-278X}, doi = {10.1515/bmt-2021-0266}, pages = {61 -- 69}, year = {2022}, abstract = {Additive manufacturing (AM) has continuously grown in recent decades. Enhanced quality, further development of technology, and fall in prices make AM applicable and capable for various industrial applications, also for the manufacture of medical devices. 3D printing offers the possibility for an unprecedented adaptation to the anatomy of each patient, generating medical devices on a case-by-case basis. In many jurisdictions, custom-made devices qualify for an exemption to pre-market approval standards. This regulation is called into question by new technologies, like AM. Therefore, this article compares the current regulatory requirements for custom-made devices in Europe, the United States, and Australia and discusses the impact on 3D printed devices. It concludes that not all jurisdictions have yet adjusted their regulatory framework for custom-made devices to technological advances. Remaining uncertainties must be eliminated in order to help manufacturers comply with the regulatory requirements, emphasizing key aspects of AM.}, language = {en} } @inproceedings{CarlKirillovHochmannetal.2023, author = {Carl, Ann-Kathrin and Kirillov, Maxim and Hochmann, David and Quadrat, Eric}, title = {Towards credible computational models: Application of a risk-based framework for establishing credibility}, series = {Transactions on Additive Manufacturing Meets Medicine}, booktitle = {Transactions on Additive Manufacturing Meets Medicine}, issn = {2699-1977}, doi = {10.25974/fhms-17382}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-173821}, year = {2023}, abstract = {The use of computational modeling and simulation (CMS) as a tool for gaining insight into the technical performance and safety of medical devices has emerged continuously over the past years. However, to rely on information and decisions derived from model predictions, it is essential to establish model credibility for the specific context of use. Limited regulatory requirements and lack of consensus on the level of verification and validation activities required result in rare use of CMS as a source of evidence in the medical device approval process. The American Society of Mechanical Engineers (ASME) developed a risk-informed framework to establish appropriate credibility requirements of a computational model: the ASME V\&V 40?2018 standard. This paper aims to outline the concepts of this standard and to demonstrate its application using an example from the orthotics field. The necessary steps to establish model credibility for a custom?made 3D printed wrist hand orthosis (WHO) are presented. It is shown that the credibility requirements of each verification and validation activity depend on model risk by applying two different contexts of use to the same computational model.}, language = {en} } @article{CarlHochmann2023, author = {Carl, Ann-Kathrin and Hochmann, David}, title = {Impact of the new European medical device regulation: a two-year comparison}, series = {Biomedical Engineering / Biomedizinische Technik}, journal = {Biomedical Engineering / Biomedizinische Technik}, issn = {1862-278X}, doi = {10.25974/fhms-17381}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-173816}, year = {2023}, abstract = {Objectives: In recent years, the European Union has revised its regulatory framework for medical devices, primarily to improve patient safety and public health. The Medical Device Regulation (MDR) is fully applicable since May 2021, strengthening the requirements for all stakeholders. As a result, many companies are facing enormous challenges. The aim of this study was to assess the impact of the MDR on the orthopaedic aids industry. Methods: Two surveys were conducted: one shortly before the MDR became applicable (146 respondents) and a second survey almost two years later (233 respondents). Results: Both surveys revealed that all businesses in the orthopaedic aids sector, regardless of size, have difficulty implementing the MDR. Key challenges include additional workload for technical documentation, increased resource expenditure and cost, and lack of clarity regarding the new requirements. Many companies are downsizing their product portfolio, resulting in potential supply shortages and a loss of competitive advantage and innovation for the medical device industry in Europe. Conclusions: The full extent of the MDR's impact on clinical practice is still unclear. However, many companies lack the necessary resources. The MDR can potentially be a bottleneck in the availability of medical devices.}, language = {en} } @article{KatthagenWermersPausetal.2023, author = {Katthagen, J. Christoph and Wermers, Jens and Paus, Christoph and Michel, Philipp A. and K{\"o}hler, Alina and Schliemann, Benedikt and Raschke, Michael J.}, title = {The long head of the biceps has a stabilizing effect on the glenohumeral joint in simulated infraspinatus or subscapularis but not supraspinatus rotator cuff deficiency - a biomechanical study}, series = {Arthroscopy: The Journal of Arthroscopic \& Related Surgery}, journal = {Arthroscopy: The Journal of Arthroscopic \& Related Surgery}, doi = {10.1016/j.arthro.2023.08.018}, year = {2023}, language = {en} } @article{HerbstMuhmannRaschkeetal.2023, author = {Herbst, Elmar and Muhmann, Raphael J. and Raschke, Michael J. and Katthagen, J. Christoph and Oeckenp{\"o}hler, Simon and Wermers, Jens and Glasbrenner, Johannes and Robinson, James R. and Kittl, Christoph}, title = {The Anterior Fibers of the Superficial MCL and the ACL Restrain Anteromedial Rotatory Instability}, series = {The American Journal of Sports Medicine}, journal = {The American Journal of Sports Medicine}, doi = {10.1177/03635465231187043}, year = {2023}, language = {en} } @article{BackhausStadlerFelten2014, author = {Backhaus, C. and Stadler, A. and Felten, C.}, title = {Violence against taxi drivers in Germany}, series = {Contribution to the 8th International Working on Safety Net Conference in Glasgow/Scotland}, journal = {Contribution to the 8th International Working on Safety Net Conference in Glasgow/Scotland}, year = {2014}, language = {en} } @article{HeldBackhaus2016, author = {Held, J. and Backhaus, C.}, title = {Ergonomie und Usability}, series = {mt-Medizintechnik}, volume = {136}, journal = {mt-Medizintechnik}, issn = {0344-9416}, pages = {2-3}, year = {2016}, language = {en} } @article{HinricherPawelzikBackhaus2021, author = {Hinricher, N. and Pawelzik, L. and Backhaus, C.}, title = {Investigation of Impulse Oscillometry for the Detection of Extravasations using Design of Experiments and an Infusion Simulator}, series = {Medical Engineering and Physics}, volume = {92}, journal = {Medical Engineering and Physics}, number = {19}, issn = {1350-4533}, doi = {10.1016/j.medengphy.2021.04.002}, pages = {33 -- 39}, year = {2021}, language = {en} } @article{BackhausMarsolekKoethetal.2003, author = {Backhaus, C. and Marsolek, I. and K{\"o}th, H. and Friesdorf, W.}, title = {Evaluating the Usability of Data Management Systems for the OR. Contribution to the 13th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Z{\"u}rich}, series = {Journal of Clinical Monitoring and Computing}, volume = {17}, journal = {Journal of Clinical Monitoring and Computing}, number = {7-8}, issn = {1387-1307}, pages = {467 -- 468}, year = {2003}, language = {en} } @inproceedings{MarsolekBackhausFriesdorf2003, author = {Marsolek, I. and Backhaus, C. and Friesdorf, W.}, title = {Clinical Data Management Systems - Defining the Process Flow Requirements. Contribution to the 13th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Z{\"u}rich}, series = {Journal of Clinical Monitoring and Computing}, volume = {17}, booktitle = {Journal of Clinical Monitoring and Computing}, number = {7-8}, issn = {1387-1307}, pages = {484}, year = {2003}, language = {en} } @inproceedings{BackhausFriesdorf2005, author = {Backhaus, C. and Friesdorf, W.}, title = {Patient Data Management Systems and Patient Safety}, series = {Tartaglia R., Bagnara S., Bellandi T., Albolino S. (Eds.). Healthcare System Ergonomics and Patient Safety - Human Factor, a Bridge Between Care and Cure}, booktitle = {Tartaglia R., Bagnara S., Bellandi T., Albolino S. (Eds.). Healthcare System Ergonomics and Patient Safety - Human Factor, a Bridge Between Care and Cure}, publisher = {Taylor \& Francis}, address = {London}, isbn = {0-415-37782-X}, pages = {43 -- 45}, year = {2005}, language = {en} } @incollection{BackhausFriesdorf2005, author = {Backhaus, C. and Friesdorf, W.}, title = {Subjective versus objective usability measuring - comparison of two different approaches to assess ergonomic quality in medical device design}, series = {Chakrabarti D., Das A. (Eds.): Humanizing Work and Work Environment}, booktitle = {Chakrabarti D., Das A. (Eds.): Humanizing Work and Work Environment}, publisher = {Allied Publishers Private Limited}, address = {New Delhi}, isbn = {9788184241242}, pages = {645 -- 648}, year = {2005}, language = {en} } @inproceedings{MarsolekSanderBackhausetal.2005, author = {Marsolek, I. and Sander, H. and Backhaus, C. and Friesdorf, W. and Haake, K. and Petersen, R. and Werners, M. and H{\"o}hn, T.}, title = {Workflow Process Support for the Clinical Routine - A Comparative Assessment of Hospital Information Systems}, series = {Contribution to the 16th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Aalborg/Denmar}, booktitle = {Contribution to the 16th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Aalborg/Denmar}, pages = {7 -- 8}, year = {2005}, language = {en} } @inproceedings{FriesdorfBackhausMarsolek2005, author = {Friesdorf, W. and Backhaus, C. and Marsolek, I.}, title = {Consistent Ergonomics - A Precondition for Optimal Clinical Working Systems}, series = {Contribution to the 16th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Aalborg/Denmark}, booktitle = {Contribution to the 16th Annual Meeting of the European Society for Computing and Technology in Anaesthesia and Intensive Care in Aalborg/Denmark}, pages = {37 -- 38}, year = {2005}, language = {en} } @inproceedings{BackhausZschernackGillesetal.2006, author = {Backhaus, C. and Zschernack, S. and Gilles, R. and Friesdorf, W.}, title = {Medical Device Safety by Participatory Design - A Systems Ergonomic Approach}, series = {Contribution to the 1th International Symposium Design Process and Human Factors Integration in Nice/France}, booktitle = {Contribution to the 1th International Symposium Design Process and Human Factors Integration in Nice/France}, year = {2006}, language = {en} } @inproceedings{BackhausFriesdorf2006, author = {Backhaus, C. and Friesdorf, W.}, title = {Ergonomics in Product Design}, series = {Contribution to the 16th International Ergonomics Association Congress in Maastricht/Netherlands}, booktitle = {Contribution to the 16th International Ergonomics Association Congress in Maastricht/Netherlands}, year = {2006}, language = {en} } @incollection{BackhausFriesdorf2007, author = {Backhaus, C. and Friesdorf, W.}, title = {Human Factors and Ergonomics in Intensive Care}, series = {Carajon P. (Ed.): Handbook of Human Factors and Ergonomics in Healthcare and Patient Safety}, booktitle = {Carajon P. (Ed.): Handbook of Human Factors and Ergonomics in Healthcare and Patient Safety}, publisher = {Lawrence Erlbaum Associates Inc}, address = {Mahwah (NJ, USA)}, isbn = {978-0-8058-4885-4}, pages = {835 -- 850}, year = {2007}, language = {en} } @inproceedings{FeltenBackhausHedtmann2008, author = {Felten, C. and Backhaus, C. and Hedtmann, J.}, title = {Baggage handling on airports}, series = {Contribution to the 13th World Congress on Safety and Health at Work in Seoul/Korea}, booktitle = {Contribution to the 13th World Congress on Safety and Health at Work in Seoul/Korea}, year = {2008}, language = {en} } @inproceedings{BackhausFeltenHedtmann2008, author = {Backhaus, C. and Felten, C. and Hedtmann, J.}, title = {Prevention of muscle-skeletal disorders by ergonomic workplace design}, series = {Contribution to the 4th International Working on Safety Net Conference in Crete /Greece}, booktitle = {Contribution to the 4th International Working on Safety Net Conference in Crete /Greece}, year = {2008}, language = {en} } @inproceedings{BackhausPatorraKalkreiberetal.2010, author = {Backhaus, C. and Patorra, A. and Kalkreiber, U. and Schulz, H. and Felten, C. and Hedtmann, J.}, title = {Risk assessment in the road transport sector - enhancing the current state}, series = {Contribution to the 5th International Working on Safety Net Conference in R{\o}ros/Norway}, booktitle = {Contribution to the 5th International Working on Safety Net Conference in R{\o}ros/Norway}, pages = {8}, year = {2010}, language = {en} } @inproceedings{BackhausJubtBaarsetal.2010, author = {Backhaus, C. and Jubt, K. H. and Baars, S. and Felten, C. and Hedtmann, J.}, title = {Analysis of lifting and carrying activities by furniture removers}, series = {Contribution to the 8th Conference from the International Occupational Hygiene Association in Rome/Italy}, booktitle = {Contribution to the 8th Conference from the International Occupational Hygiene Association in Rome/Italy}, pages = {81}, year = {2010}, language = {en} } @inproceedings{Backhaus2011, author = {Backhaus, C.}, title = {Action forces during the pushing and pulling of two wheeled waste containers}, series = {Contribution to the 14th World Congress on Safety and Health at Work in Istanbul/Turkey}, booktitle = {Contribution to the 14th World Congress on Safety and Health at Work in Istanbul/Turkey}, year = {2011}, language = {en} } @inproceedings{BackhausBaarsJubtetal.2011, author = {Backhaus, C. and Baars, S. and Jubt, K. H. and Felten, C. and Hedtmann, J.}, title = {Defining the lumbar load of removal workers}, series = {Contribution to the 14th World Congress on Safety and Health at Work in Istanbul/Turkey}, booktitle = {Contribution to the 14th World Congress on Safety and Health at Work in Istanbul/Turkey}, pages = {479}, year = {2011}, language = {en} } @inproceedings{BackhausJubtPostetal.2012, author = {Backhaus, C. and Jubt, K. H. and Post, M. and Ellegast, R. and Felten, C. and Hedtmann, J.}, title = {Manual handling of waste containers}, series = {Contribution to the 6th International Working on Safety Net Conference in Sopot/Poland}, booktitle = {Contribution to the 6th International Working on Safety Net Conference in Sopot/Poland}, pages = {96 -- 97}, year = {2012}, language = {en} } @inproceedings{HedtmannBackhausJaeger2014, author = {Hedtmann, J. and Backhaus, C. and J{\"a}ger, M.}, title = {Supporting disabled persons aboard aircraft - defining best practice strategies to reduce musculoskeletal workload}, series = {Contribution to the 85th Annual Scientific Conference of the Aerospace Medical Association in San Diego/USA}, booktitle = {Contribution to the 85th Annual Scientific Conference of the Aerospace Medical Association in San Diego/USA}, year = {2014}, language = {en} } @inproceedings{BackhausFelten2014, author = {Backhaus, C. and Felten, Ch.}, title = {Violence in the taxi branch - analysis of the current situation and prevention opportunities}, series = {Contribution to the 15th World Congress on Safety and Health at Work in Frankfurt/Germany}, booktitle = {Contribution to the 15th World Congress on Safety and Health at Work in Frankfurt/Germany}, year = {2014}, language = {en} } @inproceedings{HomannBackhausBecketal.2014, author = {Homann, H. and Backhaus, C. and Beck, B. and J{\"a}ger, M.}, title = {Study on the stress of flight attendants in the case of assisting towards mobility disabled passengers}, series = {Contribution to the 8th International Working on Safety Net Conference in Glasgow/Scotland}, booktitle = {Contribution to the 8th International Working on Safety Net Conference in Glasgow/Scotland}, year = {2014}, language = {en} } @inproceedings{BackhausHomannBecketal.2014, author = {Backhaus, C. and Homann, H. and Beck, B. and J{\"a}ger, M.}, title = {How to handle a disabled person aboard an aircraft? - a practice approach to reduce flight attendance's musculoskeletal workload}, series = {Contribution to the 5th International Conference on Applied Human Factors and Ergonomics in Krakow/Poland}, booktitle = {Contribution to the 5th International Conference on Applied Human Factors and Ergonomics in Krakow/Poland}, year = {2014}, language = {en} } @inproceedings{MarckwardtBackhaus2014, author = {Marckwardt, A. and Backhaus, C.}, title = {Kinetic analysis of the motion behaviour of bus drivers}, series = {Contribution to the 5th International Conference on Applied Human Factors and Ergonomics in Krakow/Poland}, booktitle = {Contribution to the 5th International Conference on Applied Human Factors and Ergonomics in Krakow/Poland}, year = {2014}, language = {en} } @inproceedings{BackhausJaegerHomannetal.2015, author = {Backhaus, C. and J{\"a}ger, M. and Homann, H. and Felten, C. and Hedtmann, J.}, title = {Development of a new handling aid for disabled passengers aboard aircraft}, series = {Contribution to the 8th International Working on Safety Net Conference}, booktitle = {Contribution to the 8th International Working on Safety Net Conference}, pages = {228 -- 229}, year = {2015}, language = {en} } @inproceedings{GarciaGuerreroBackschatHoelscheretal.2017, author = {Garcia Guerrero, J. M. and Backschat, L. and H{\"o}lscher, U. and Backhaus, C.}, title = {Fall-management for eldery by multisensory-analysis with integration in a social environment}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering.}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering.}, doi = {10.1515/bmt-2017-5087}, pages = {472}, year = {2017}, language = {en} } @inproceedings{BackschatHoelscherBackhaus2017, author = {Backschat, L. and H{\"o}lscher, U. and Backhaus, C.}, title = {Development of a measuring system to prevent extravasations}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2017-5087}, pages = {470}, year = {2017}, language = {en} } @inproceedings{HorstickSiebersBackhaus2017, author = {Horstick, J. and Siebers, S. and Backhaus, C.}, title = {Examination of the skin conductance level as an index of the activity of the sympathetic nervous system in physical and psychical stress situations}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering.}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering.}, doi = {10.1515/bmt-2017-5074}, pages = {389}, year = {2017}, language = {en} } @inproceedings{MesterKehmannIbenthaletal.2017, author = {Mester, C. and Kehmann, M. and Ibenthal, E. and Backhaus, C.}, title = {Conduct a study on the research and exemplary development of context-sensitive support systems for dementia patients with subsequent evaluation}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2017-5077}, pages = {411}, year = {2017}, language = {en} } @article{IbenthalHoelscherBackhaus2017, author = {Ibenthal, E. and H{\"o}lscher, U. and Backhaus, C.}, title = {Distinguishability and identifiability of products with small bore connectors according to ISO DIS 80369 series: risk analysis and summative evaluation}, series = {Current Directions in Biomedical Engineering}, volume = {3}, journal = {Current Directions in Biomedical Engineering}, number = {2}, doi = {10.1515/cdbme-2017-0106}, pages = {505 -- 507}, year = {2017}, language = {en} } @article{HorstickSiebersBackhaus2018, author = {Horstick, J. and Siebers, S. and Backhaus, C.}, title = {Examination of the skin conductance level as an index of the activity of the sympathetic nervous system for application in the continuous blood pressure measurement}, series = {International Journal of Biomedical Engineering and Science}, volume = {5}, journal = {International Journal of Biomedical Engineering and Science}, number = {2}, issn = {2376-7227}, doi = {10.5121/ijbes.2018.5201}, year = {2018}, language = {en} } @inproceedings{PawelzikBackhaus2018, author = {Pawelzik, L. and Backhaus, C.}, title = {Development of a mathematical model to calculate mechanical properties at the proximal end of peripheral vein catheters}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2018-6047}, pages = {254}, year = {2018}, language = {en} } @inproceedings{HinricherPawelzikBackhaus2018, author = {Hinricher, N. and Pawelzik, L. and Backhaus, C.}, title = {Development of a tissue model to simulate extravasation}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2018-6051}, pages = {315}, year = {2018}, language = {en} } @inproceedings{MuellerBackhaus2018, author = {M{\"u}ller, L. and Backhaus, C.}, title = {A methodical approach for integrating end-user usability evaluations into the procurement process of medical devices}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2018-6051}, pages = {306}, year = {2018}, language = {en} } @inproceedings{IbenthalBackhaus2018, author = {Ibenthal, E. and Backhaus, C.}, title = {Ergonomic Design of Interfaces for People with Dementia}, series = {Proceedings of the 20th Congress of the International Ergonomics Association}, booktitle = {Proceedings of the 20th Congress of the International Ergonomics Association}, doi = {10.1007/978-3-319-96071-5_151}, pages = {1483 -- 1492}, year = {2018}, language = {en} } @article{MuellerBackhaus2019, author = {M{\"u}ller, L. and Backhaus, C.}, title = {Questionnaire to evaluate user acceptance before purchasing medical devices in health facilities}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, journal = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6017}, pages = {79}, year = {2019}, language = {en} } @inproceedings{MuellerSobkowiczIbenthaletal.2019, author = {M{\"u}ller, L. and Sobkowicz, S. and Ibenthal, E. and Backhaus, C.}, title = {Usability assessment of patient hoists as a purchasing guide for health facilities}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6017}, pages = {271}, year = {2019}, language = {en} } @inproceedings{RayhanHinricherPawelziketal.2019, author = {Rayhan, M. F. and Hinricher, N. and Pawelzik, L. and Backhaus, C.}, title = {In-Vitro comparison of pressure and velocity in vein with oscillating infusion for different catheter sizes}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6023}, pages = {271}, year = {2019}, language = {en} } @inproceedings{CarlHinricherMuelleretal.2019, author = {Carl, A. and Hinricher, N. and M{\"u}ller, L. and Backhaus, C.}, title = {Identification of noise pollution in neonatal intensive care units based on work process analyses}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6017}, pages = {80}, year = {2019}, language = {en} } @inproceedings{SobkowiczIbenthalBackhaus2019, author = {Sobkowicz, S. and Ibenthal, E. and Backhaus, C.}, title = {Patient and operating safety with electrical therapy beds - A systematic analysis of clamping and crushing risks}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6017}, pages = {82}, year = {2019}, language = {en} } @inproceedings{MesterMuellerSobkowiczetal.2019, author = {Mester, C. and M{\"u}ller, L. and Sobkowicz, S. and Pawelzik, L. and Hinricher, N. and Backhaus, C.}, title = {Investigation of Action Forces of Patient Hoists According to DIN EN ISO 10535 and Mital}, series = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, booktitle = {Contribution to the Annual Meeting of German Society of Biomedical Engineering}, doi = {10.1515/bmt-2019-6023}, pages = {137}, year = {2019}, language = {en} } @article{PawelzikIbenthalBackhaus2019, author = {Pawelzik, L. and Ibenthal, E. and Backhaus, C.}, title = {Learning by Researching - Students enhance perfusionist's workplace with data glasses in internships}, series = {Current Directions in Biomedical Engineering}, volume = {5}, journal = {Current Directions in Biomedical Engineering}, number = {1}, doi = {10.1515/cdbme-2019-0033}, pages = {127 -- 130}, year = {2019}, language = {en} } @article{MuellerSobkowiczIbenthaletal.2019, author = {M{\"u}ller, L. and Sobkowicz, S. and Ibenthal, E. and Backhaus, C.}, title = {Usability assessment of patient hoists as a purchasing guide for health facilities}, series = {Current Directions in Biomedical Engineering}, volume = {5}, journal = {Current Directions in Biomedical Engineering}, doi = {10.1515/cdbme-2019-0036}, pages = {141 -- 144}, year = {2019}, language = {en} } @inproceedings{IbenthalSobkowiczBackhaus2020, author = {Ibenthal, E. and Sobkowicz, S. and Backhaus, C}, title = {Investigation of Clamping and Crushing Injuries with Electrically Height-Adjustable Therapy Beds}, series = {Contribution to the 22th International Human Computer Interaction Conference}, booktitle = {Contribution to the 22th International Human Computer Interaction Conference}, doi = {10.1007/978-3-030-49904-4_10}, pages = {132 -- 144}, year = {2020}, language = {en} } @article{IbenthalKehmannBackhaus2020, author = {Ibenthal, E. and Kehmann, M. and Backhaus, C.}, title = {Feasibility of a Music System Intervention to Affect Mental Stress and Strain of Employees in Inpatient Dementia Care}, series = {Annals of Work Exposures and Health}, volume = {65}, journal = {Annals of Work Exposures and Health}, doi = {10.1093/annweh/wxaa120}, pages = {591 - 604}, year = {2020}, language = {en} } @article{AlonsoAlpigianiWittrock2022, author = {Alonso, Iv{\´a}n and Alpigiani, Cristiano and Wittrock, Ulrich}, title = {Cold atoms in space: community workshop summary and proposed road-map}, series = {EPJ Quantum Technology}, journal = {EPJ Quantum Technology}, publisher = {Springer Nature}, doi = {10.1140/epjqt/s40507-022-00147-w}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-160413}, pages = {30}, year = {2022}, abstract = {We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible road-map for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with the European Space Agency (ESA) and national space and research funding agencies.}, language = {en} } @article{PawelzikBackhaus2021, author = {Pawelzik, L. and Backhaus, C.}, title = {Evaluation of Impuls-Oscillometric Extravasatio Prevention}, series = {Medical Engineering and Physics}, volume = {88}, journal = {Medical Engineering and Physics}, issn = {1350-4533}, doi = {10.1016/j.medengphy.2020.12.004}, pages = {54 -- 58}, year = {2021}, language = {en} } @inproceedings{NguyenMartinaKernagisetal.2021, author = {Nguyen, K. and Martina, S. and Kernagis, D. and Bershad, E. and Clark, J. and Hinricher, N. and Backhaus, C.}, title = {Effekt of repetetive, successive oculometric testing an saccades, smooth pursuit, and visual reaction times for future head down bed rest study (HDBR) applikations}, series = {Contribution to the NASA Online-Conference for Advancing Human Space Flight Research Through Innovation and Collaboration}, booktitle = {Contribution to the NASA Online-Conference for Advancing Human Space Flight Research Through Innovation and Collaboration}, year = {2021}, language = {en} } @article{IbenthalKehmannBackhaus2021, author = {Ibenthal, E. and Kehmann, M. and Backhaus, C.}, title = {Effectiveness of personalized music systems to influence neuropsychiatric symptoms associated with dementia: a quasi-experimental study}, series = {EXPLORE: The Journal of Science \& Healing}, volume = {18}, journal = {EXPLORE: The Journal of Science \& Healing}, doi = {10.1016/j.explore.2021.03.004}, pages = {319 -- 326}, year = {2021}, language = {en} } @inproceedings{BackhausHaimerl2021, author = {Backhaus, C. and Haimerl, G.}, title = {Engineers in Clinical Perfusion}, series = {Contribution to the 59th International Conference of the American Society for Extracorpreal Technology. AmSECT International Online Conference}, booktitle = {Contribution to the 59th International Conference of the American Society for Extracorpreal Technology. AmSECT International Online Conference}, year = {2021}, language = {en} } @inproceedings{IbenthalHinricherBackhaus2022, author = {Ibenthal, E. and Hinricher, N. and Backhaus, C.}, title = {Feasibility of a tracking system for hospital beds to improve work processes of nurses}, series = {Contribution to the 11th International Working on Safety Net Conference in Algarve/Portugal. ID1080}, booktitle = {Contribution to the 11th International Working on Safety Net Conference in Algarve/Portugal. ID1080}, year = {2022}, language = {en} } @inproceedings{HinricherSchroeerBackhaus2022, author = {Hinricher, N. and Schr{\"o}er, C. and Backhaus, C.}, title = {Design of control elements in virtual reality - investigation of factors influencing operating efficiency, user experience and presence}, series = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Human Factors in Virtual Environments and Game Design}, volume = {50}, booktitle = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Human Factors in Virtual Environments and Game Design}, doi = {10.54941/ahfe1002066}, pages = {100 -- 109}, year = {2022}, language = {en} } @inproceedings{IbenthalBackhaus2022, author = {Ibenthal, E. and Backhaus, C.}, title = {Reducing work-related stress in nursing when dealing with people with dementia through music intervention - which factors are relevant?}, series = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, volume = {38}, booktitle = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, doi = {10.54941/ahfe1001661}, pages = {34 -- 41}, year = {2022}, language = {en} } @inproceedings{MuellerHinricherGersieetal.2022, author = {M{\"u}ller, L. and Hinricher, N. and Gersie, J. and Backhaus, C.}, title = {Prototype of a Piece of Clothing for Patients for Quick and Easy Patient Mobilizations in Healthcare Facilities}, series = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, volume = {51}, booktitle = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, doi = {10.54941/ahfe1002122}, pages = {230 -- 238}, year = {2022}, language = {en} } @inproceedings{BackhausSiebers2022, author = {Backhaus, C. and Siebers, S.}, title = {Work-related noise exposure in a neonatal intensive care unit - stressful work activities and diurnal rhythmic variations}, series = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, volume = {51}, booktitle = {Contribution to the 13th International Conference on Applied Human Factors and Ergonomics. Healthcare and Medical Devices}, doi = {10.54941/ahfe1002129}, pages = {286 -- 292}, year = {2022}, language = {en} } @article{HomrighausenHorsthemkePogorzelskietal.2023, author = {Homrighausen, Jonas and Horsthemke, Ludwig and Pogorzelski, Jens and Trinschek, Sarah and Gl{\"o}sek{\"o}tter, Peter and Gregor, Markus}, title = {Edge-Machine-Learning-Assisted Robust Magnetometer Based on Randomly Oriented NV-Ensembles in Diamond}, series = {Sensors}, volume = {23}, journal = {Sensors}, number = {3}, doi = {10.3390/s23031119}, year = {2023}, abstract = {Quantum magnetometry based on optically detected magnetic resonance (ODMR) of nitrogen vacancy centers in nano- or micro-diamonds is a promising technology for precise magnetic-field sensors. Here, we propose a new, low-cost and stand-alone sensor setup that employs machine learning on an embedded device, so-called edge machine learning. We train an artificial neural network with data acquired from a continuous-wave ODMR setup and subsequently use this pre-trained network on the sensor device to deduce the magnitude of the magnetic field from recorded ODMR spectra. In our proposed sensor setup, a low-cost and low-power ESP32 microcontroller development board is employed to control data recording and perform inference of the network. In a proof-of-concept study, we show that the setup is capable of measuring magnetic fields with high precision and has the potential to enable robust and accessible sensor applications with a wide measuring range.}, language = {en} } @article{DeichselRaschkeHerbstetal.2022, author = {Deichsel, Adrian and Raschke, Michael J. and Herbst, Elmar and Peez, Christian and Oeckenp{\"o}hler, Simon and Briese, Thorben and Wermers, Jens and Kittl, Christoph and Glasbrenner, Johannes}, title = {The Biomechanical Stability of Bone Staples in Cortical Fixation of Tendon Grafts for Medial Collateral Ligament Reconstruction Depends on the Implant Design}, series = {The American Journal of Sports Medicine}, volume = {50}, journal = {The American Journal of Sports Medicine}, number = {14}, issn = {1552-3365}, doi = {10.1177/03635465221130753}, pages = {3827 -- 3831}, year = {2022}, language = {en} } @article{BehrendtHerbstRobinsonetal.2022, author = {Behrendt, Peter and Herbst, Elmar and Robinson, James R. and von Negenborn, Leslie and Raschke, Michael J. and Wermers, Jens and Glasbrenner, Johannes and Fink, Christian and Herbort, Mirco and Kittl, Christoph}, title = {The Control of Anteromedial Rotatory Instability Is Improved With Combined Flat sMCL and Anteromedial Reconstruction}, series = {The American Journal of Sports Medicine}, volume = {50}, journal = {The American Journal of Sports Medicine}, number = {8}, issn = {1552-3365}, doi = {10.1177/03635465221096464}, pages = {2093 -- 2101}, year = {2022}, language = {en} } @article{HeilmannSussiekRaschkeetal.2022, author = {Heilmann, Lukas F. and Sußiek, Julia and Raschke, Michael J. and Langer, Martin F. and Frank, Andre and Wermers, Jens and Michel, Philipp A. and Dyrna, Felix and Schliemann, Benedikt and Katthagen, J. Christoph}, title = {Biomechanical Analysis of Coracoid Stability After Coracoplasty: How Low Can You Go?}, series = {Orthopaedic Journal of Sports Medicine}, volume = {10}, journal = {Orthopaedic Journal of Sports Medicine}, number = {2}, issn = {2325-9671}, doi = {10.1177/23259671221077947}, year = {2022}, language = {en} } @article{WermersSchliemannRaschkeetal.2021, author = {Wermers, Jens and Schliemann, Benedikt and Raschke, Michael J. and Dyrna, Felix and Heilmann, Lukas F. and Michel, Philipp A. and Katthagen, J. Christoph}, title = {The Glenolabral Articular Disruption Lesion Is a Biomechanical Risk Factor for Recurrent Shoulder Instability}, series = {Arthroscopy, Sports Medicine, and Rehabilitation}, volume = {3}, journal = {Arthroscopy, Sports Medicine, and Rehabilitation}, number = {6}, issn = {2666-061X}, doi = {10.1016/j.asmr.2021.08.007}, pages = {e1803 -- e1810}, year = {2021}, language = {en} } @article{WermersRaschkeWilkenetal.2021, author = {Wermers, Jens and Raschke, Michael J. and Wilken, Marcel and Riegel, Arne and Katthagen, J. Christoph}, title = {The Anatomy of Glenoid Concavity-Bony and Osteochondral Assessment of a Stability-Related Parameter}, series = {Journal of Clinical Medicine}, volume = {10}, journal = {Journal of Clinical Medicine}, number = {19}, issn = {2077-0383}, doi = {10.3390/jcm10194316}, pages = {4316}, year = {2021}, language = {en} } @article{KatthagenMichelRaschkeetal.2021, author = {Katthagen, J. Christoph and Michel, Philipp and Raschke, Michael J. and Sußiek, Julia and Frank, Andre and Wermers, Jens and Dyrna, Felix and Schliemann, Benedikt}, title = {The forgotten fragment: additional lesser tuberosity fixation of 4-part proximal humeral fractures-a biomechanical investigation}, series = {Journal of Shoulder and Elbow Surgery}, volume = {30}, journal = {Journal of Shoulder and Elbow Surgery}, number = {12}, issn = {1532-6500}, doi = {10.1016/j.jse.2021.04.041}, pages = {2852 -- 2861}, year = {2021}, language = {en} } @article{KatthagenSussiekFranketal.2022, author = {Katthagen, J. Christoph and Sußiek, Julia and Frank, Andre and Wermers, Jens and Schliemann, Benedikt and Raschke, Michael J.}, title = {Double plating is associated with higher fixation strength than single plating in osteoporotic fractures of the scapular spine: a biomechanical study}, series = {Archives of Orthopaedic and Trauma Surgery}, volume = {142}, journal = {Archives of Orthopaedic and Trauma Surgery}, number = {8}, issn = {1434-3916}, doi = {10.1007/s00402-021-03879-z}, pages = {1859 -- 1864}, year = {2022}, language = {en} } @article{WermersSchliemannRaschkeetal.2021, author = {Wermers, Jens and Schliemann, Benedikt and Raschke, Michael J. and Michel, Philipp A. and Heilmann, Lukas F. and Dyrna, Felix and Sußiek, Julia and Frank, Andre and Katthagen, J. Christoph}, title = {Glenoid concavity has a higher impact on shoulder stability than the size of a bony defect}, series = {Knee Surgery, Sports Traumatology, Arthroscopy}, journal = {Knee Surgery, Sports Traumatology, Arthroscopy}, doi = {10.1007/s00167-021-06562-3}, year = {2021}, language = {en} } @article{PeezWermersGlasbrenneretal.2022, author = {Peez, Christian and Wermers, Jens and Glasbrenner, Johannes and Briese, Thorben and Raschke, Michael J. and Herbst, Elmar and Kittl, Christoph}, title = {Qualitative and Quantitative Assessment of the Medial Patellar Retinaculum Anatomy: the Anteromedial Side of the Knee Revisited}, series = {Orthopaedic Journal of Sports Medicine}, volume = {10}, journal = {Orthopaedic Journal of Sports Medicine}, number = {11}, doi = {10.1177/23259671221134818}, year = {2022}, language = {en} } @article{OtteBobkovaTrinscheketal.2022, author = {Otte, Eileen and Bobkova, Valeria and Trinschek, Sarah and Rosales-Guzm{\´a}n, Carmelo and Denz, Cornelia}, title = {Single-shot all-digital approach for measuring the orbital angular momentum spectrum of light}, series = {APL Photonics}, volume = {2022}, journal = {APL Photonics}, number = {7}, doi = {10.1063/5.0086536}, pages = {086105}, year = {2022}, abstract = {Light fields carrying orbital angular momentum (OAM) offer a broad variety of applications in which especially an accurate determination of the respective OAM spectrum, i.e., unraveling the content of OAM by its topological charge ℓ, has become a main subject. Even though various techniques have been proposed to measure the OAM spectrum of such modes, many of them fail if optical vortices have to be considered in perturbed or dynamically changing experimental systems. Here, we put forward a novel technique capable of determining the OAM spectrum of light by a single measurement shot, which specifically applies to those fields that have been distorted. Experimentally, our technique only requires to interfere the perturbed light field with a reference field. From the resulting intensity pattern, the accurate OAM spectrum is determined in an all-digital way. We demonstrate our novel approach by numerical simulations and a proof-of-concept experiment employing a model ball lens as an exemplary disturbing object.}, language = {en} } @article{SandtenBoeingHrinciusetal.2021, author = {Sandten, Christian Stefan and B{\"o}ing, Christian and Hrincius, Eike and Anhlan, Darisuren and Kreyenschmidt, Martin and Ludwig, Stephan and Mertins, Hans-Christoph and Mellmann, Alexander and Dworog, Andreas and Hanning, Stephanie and Kuennemann, Thilo and Niehues, Christopher and Schupp, Thomas and Stec, Edyta and Thume, Julius and Triphaus, Daniel and Wilkern, Markus and Uphoff, Holger and Z{\"u}ndorf, Josef and Jacobshagen, Anja}, title = {Decontamination of disposable respirators for reuse in a pandemic employing in-situ-generated peracetic acid}, series = {American Journal of Infection Control}, volume = {00 / 2021}, journal = {American Journal of Infection Control}, doi = {10.1016/j.ajic.2021.09.017}, pages = {1 -- 7}, year = {2021}, language = {en} } @article{BobkovaTrinschekOtteetal.2022, author = {Bobkova, Valeriia and Trinschek, Sarah and Otte, Eileen and Denz, Cornelia}, title = {Analyzing light-structuring features of droplet lenses on liquid-repelling surfaces}, series = {Optics Express}, volume = {30}, journal = {Optics Express}, number = {4}, doi = {10.1364/OE.444777}, pages = {5937 -- 5952}, year = {2022}, language = {en} } @article{Morawetz2021, author = {Morawetz, KLaus}, title = {Consistent solution of Einstein-Cartan equations with torsion outside matter}, doi = {10.1088/1361-6382/ac2417}, year = {2021}, language = {en} } @article{Morawetz2021, author = {Morawetz, Klaus}, title = {Exploring Anomalies by Many-Body Correlations}, series = {PSS B}, journal = {PSS B}, publisher = {Wiley}, doi = {10.25974/fhms-14283}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-142836}, year = {2021}, abstract = {The quantum anomaly is written alternatively into a form violating conservation laws or as non-gauge invariant currents seen explicitly on the example of chiral anomaly. By reinterpreting the many-body averaging, the connection to Pauli-Villars regularization is established which gives the anomalous term a new interpretation as arising from quantum fluctuations by many-body correlations at short distances. This is exemplified using an effective many-body quantum potential which realizes quantum Slater sums by classical calculations. It is shown that these quantum potentials avoid the quantum anomaly but approach the same anomalous result by many-body correlations. Consequently, quantum anomalies might be a shortcut way of single-particle field theory to account for many-body effects. This conjecture is also supported since the chiral anomaly can be derived by a completely conserving quantum kinetic theory. A measure for the quality of quantum potentials is suggested to describe these quantum fluctuations in the mean energy. The derived quantum potentials might be used to describe quantum simulations in classical terms.}, language = {en} } @article{TrinschekJohnThiele2018, author = {Trinschek, Sarah and John, Karin and Thiele, Uwe}, title = {Modelling of surfactant-driven front instabilities in spreading bacterial colonies}, series = {Soft Matter}, volume = {14}, journal = {Soft Matter}, number = {22}, doi = {10.1039/C8SM00422F}, pages = {4464 -- 4476}, year = {2018}, language = {en} } @article{TrinschekJohnLecuyeretal.2017, author = {Trinschek, Sarah and John, Karin and Lecuyer, Sigolene and Thiele, Uwe}, title = {Continuous versus arrested spreading of biofilms at solid-gas interfaces: The role of surface forces}, series = {Physical Review Letters}, volume = {119}, journal = {Physical Review Letters}, number = {7}, doi = {10.1103/PhysRevLett.119.078003}, pages = {078003}, year = {2017}, language = {en} } @article{TrinschekJohnThiele2016, author = {Trinschek, Sarah and John, Karin and Thiele, Uwe}, title = {From a thin film model for passive suspensions towards the description of osmotic biofilm spreading}, series = {AIMS Materias Science}, volume = {3}, journal = {AIMS Materias Science}, number = {3}, doi = {10.3934/matersci.2016.3.1138}, pages = {1138 -- 1159}, year = {2016}, language = {en} } @article{TrinschekLinz2016, author = {Trinschek, Sarah and Linz, Stefan}, title = {Dynamics of Attractively and Repulsively Coupled Elementary Chaotic Systems}, series = {International Journal of Bifurcation and Chaos}, volume = {26}, journal = {International Journal of Bifurcation and Chaos}, number = {3}, doi = {10.1142/S0218127416300056}, pages = {1630005}, year = {2016}, language = {en} } @inproceedings{FreudlingGrzesikErhardetal.2021, author = {Freudling, Maximilian and Grzesik, Andreas and Erhard, Markus and Gerhards, Maximilian and Leitz, Sinje and Verpoort, Sven and Wittrock, Ulrich and Hallibert, Pascal}, title = {Space-qualified piezo based deformable mirror for future instruments with active optics}, series = {Proceedings of the International Conference on Space Optics (ICSO)}, volume = {11852}, booktitle = {Proceedings of the International Conference on Space Optics (ICSO)}, organization = {ESA/ESTEC, Noordwijk}, doi = {10.25974/fhms-13741}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-137410}, pages = {1185231-11}, year = {2021}, abstract = {This paper presents the results of the technology development project "Enabling Technologies for Piezo-Based Deformable Mirrors in Active Optics Correction Chains" conducted by OHB System AG together with its partner M{\"u}nster University of Applied Sciences (MUAS). The project was funded by ESA within their General Support Technology Programme (GSTP). We address in this paper mainly the definition, flow-down and verification of the requirements for the Deformable Mirror (DM). The requirements were derived from a set of real space mission applications. The deformation of the mirror is performed by piezo-ceramic actuators in an unimorph configuration. The finally developed DM is able produce Zernike modes with a stroke of several tens of µm over a clear optical aperture of 50 mm in diameter. It underwent successfully a full environmental qualification campaign including thermal cycling, shock- and vibration testing, as well as exposure to proton and γ-ray radiation. Thermal and performance tests were performed in the temperature range from 100 K to 300 K. Furthermore, the DM sustained all vibration (random 17.8 g RMS and sinus) and shock (300 g) testing. Thereby all criticalities which were identified a previous study have been overcome successfully. A Technology Readiness Level (TRL) of 5 is reached, as the component has been validated in relevant environment. Based on the high level of maturity, this deformable mirror is now ready for the incorporation in future flight instruments. The achieved TRL of 5 is sufficient for the status of a PDR at payload level and gives thus a very good basis for all kinds of potential B2, C/D payload developments.}, language = {en} } @inproceedings{LeitzGerhardsVerpoortetal.2021, author = {Leitz, Sinje and Gerhards, Maximilian and Verpoort, Sven and Wittrock, Ulrich and Freudling, Maximilian and Grzesik, Andreas and Erhard, Markus and Hallibert, Pascal}, title = {Vibration and shock testing of a 50 mm aperture unimorph deformable mirror}, series = {Proceedings of the International Conference on Space Optics (ICSO)}, volume = {11852}, booktitle = {Proceedings of the International Conference on Space Optics (ICSO)}, organization = {ESA/ESTEC, Noordwijk}, doi = {10.25974/fhms-13740}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-137401}, pages = {118524N}, year = {2021}, abstract = {We present our latest results on a refined unimorph deformable mirror which was developed in the frame of the ESA GSTP activity "Enabling Technologies for Piezo-Based Deformable Mirrors in Active Optics Correction Chains". The identified baseline concept with the soft piezoceramic material PIC151 successfully sustained all vibration requirements (17.8 gRMS random and 20 g sine) and shock testing (300 g SRS). We cover the mirror design development which reduces the stress in the brittle piezo-ceramic by 90 \% compared to the design from a former GSTP activity. We briefly address the optical characterization of the deformable mirror, namely the achieved Zernike amplitudes as well as the unpowered surface deformation (1.7 µm) and active flattening (12.3 nmRMS). The mirror produces low-order Zernike modes with a stroke of several tens of micrometer over a correction aperture of 50 mm, which makes the mirror a versatile tool for space telescopes.}, language = {en} } @inproceedings{WangGurevichOstendorf2021, author = {Wang, Hao and Gurevich, Evgeny L and Ostendorf, Andreas}, title = {Application of nanoindentation technique to test surface hardness and residual stress of NiTi alloy after femtosecond laser shock peening}, series = {High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X / SPIE.Digital.Library}, booktitle = {High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X / SPIE.Digital.Library}, publisher = {International Society for Optics and Photonics}, address = {USA}, doi = {10.1117/12.2593092}, pages = {116790J-0 -- 116790J-5}, year = {2021}, abstract = {Laser shock peening is a new and important surface treatment technique that can enhance the mechanical properties of metal materials. Normally, the nanosecond laser with pulse-width between 5 ns and 20 ns is used to induce a high-pressure shock wave that can generate plastic deformation in the top layer of metals. The femtosecond laser shock peening in the air has been studied recently, which can induce higher pressure shock wave than that of traditional nanosecond laser shock peening in a very short time. The NiTi alloy is processed by femtosecond laser shock peening, then a nanoindentation device is used to measure its surface hardness and residual stress. The hardness results of NiTi alloy before and after treatment show that the femtosecond laser shock peening can increase the hardness of NiTi alloy, which also shows that the femtosecond laser can be used to perform laser shock peening on NiTi alloy without coating.}, language = {en} } @article{WangGurevichOstendorf2020, author = {Wang, Hao and Gurevich, Evgeny L and Ostendorf, Andreas}, title = {Femtosecond laser shock peening on the surface of NiTi shape memory alloy}, series = {Procedia CIRP}, volume = {94/2020}, journal = {Procedia CIRP}, doi = {10.1016/j.procir.2020.09.071}, pages = {910 -- 913}, year = {2020}, abstract = {Laser shock peening with a femtosecond laser system was presented in this research work. The NiTi shape memory alloy was processed by the femtosecond laser shock peening (FsLSP) treatment without a protective layer in the air. Femtosecond laser shock peening is a new surface technology, which can induce an intense shock wave with low single laser pulse energy under atmospheric conditions. The surface topography, roughness, microhardness, and wear resistance were measured on the surface of NiTi alloy before and after femtosecond laser peening treatment. The results showed that the surface roughness and microhardness could be increased after femtosecond laser shock peening, which may be due to the laser ablation and micro-plastic deformation induced by the shock wave. The wear property of NiTi alloy was improved, which may be attributed to the FsLSPed surface texturing and …}, language = {en} } @article{MaragkakiSkaradzinskiNettetal.2020, author = {Maragkaki, Stella and Skaradzinski, Christian A and Nett, Ralf and Gurevich, Evgeny L}, title = {Influence of defects on structural colours generated by laser-induced ripples}, series = {Scientific Reports}, volume = {10}, journal = {Scientific Reports}, number = {1}, doi = {10.1038/s41598-019-56638-x}, pages = {53 -- 53}, year = {2020}, abstract = {The colourisation of metallic surface which appears due to periodic surface patterns induced by ultrashort laser pulses is studied. Ripples due to the sub-micrometer size of their period act as a diffraction grating, generating structural colours. Carefully chosen strategy of the laser spot scanning allows us to mimic the nanostructures responsible for structural colours of some flowers on the metal substrate. We investigate the correlation between the colourising effects and the artificially-induced defects in the ripples structure and show that these defects can make the colours observable in a larger range of viewing angles. Further we address the influence of the processing parameters on the spectral profile of the reflected light.}, language = {en} } @article{SurkampZylaGurevichetal.2020, author = {Surkamp, N and Zyla, G and Gurevich, Evgeny L and Klehr, A and Knigge, A and Ostendorf, Andreas and Hofmann, MR}, title = {Mode-locked diode laser-based two-photon polymerisation}, series = {Electronics Letters}, volume = {56/2020}, journal = {Electronics Letters}, number = {2}, issn = {0013-5194}, doi = {10.1049/el.2019.2385}, pages = {91 -- 93}, year = {2020}, abstract = {In this Letter, the authors present the construction of three-dimensional microstructures by two-photon polymerisation induced by ultrashort pulses of a mode-locked diode laser. The ultrafast light source is based on a diode laser with segmented metallisation to realise a waveguide integrated saturable absorber. It is subsequently amplified and compressed resulting in ultrashort laser pulses of 440 fs length and average output power of 160 mW at a fundamental repetition rate of 383.1 MHz. These pulses are coupled into a customised two-photon polymerisation setup. A series of suspended lines were fabricated between support cuboids for testing the process behaviour. A 3D structure with complex features was polymerised to demonstrate the high potential for mode-locked diode lasers in the field of direct laser writing.}, language = {en} } @article{WangJuergensenDeckeretal.2020, author = {Wang, Hao and J{\"u}rgensen, Jens and Decker, Peer and Hu, Zhiyong and Yan, Kai and Gurevich, Evgeny L and Ostendorf, Andreas}, title = {Corrosion behavior of NiTi alloy subjected to femtosecond laser shock peening without protective coating in air environment}, series = {Applied Surface Science}, volume = {501/2020}, journal = {Applied Surface Science}, doi = {10.1016/j.apsusc.2019.144338}, pages = {144338 -- 144338}, year = {2020}, abstract = {Laser shock peening with femtosecond laser was used to improve the corrosion resistance of biomedical NiTi alloy without protective coating in the air environment. The energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) based analysis showed that the laser ablation could produce titanium oxide layer and femtosecond laser shock peening (FsLSP) can generate residual stress in the surface layer of NiTi alloy. The FsLSP improved the corrosion resistance of NiTi in 3.5\% NaCl solution and Hank's solution and also prevented the formation of corrosion cracks and pits during corrosion testing. The reasons for the improvement of corrosion behavior may be the generation of residual stress and titanium oxide film during the laser surface treatment.}, language = {en} } @inproceedings{WangGurevichOstendorf2020, author = {Wang, Hao and Gurevich, Evgeny L and Ostendorf, Andreas}, title = {Microhardness and microabrasion behaviour of NiTi shape memory alloy after femtosecond laser shock peening without coating in air}, series = {High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX}, booktitle = {High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX}, publisher = {International Society for Optics and Photonics}, address = {USA}, doi = {10.1117/12.2543550}, pages = {1127301 -- 1127301}, year = {2020}, abstract = {The experiment study presents the influence of femtosecond laser shock peening (FsLSP) without a protective layer in the air on the surface hardness and surface mechanical property of NiTi shape memory alloy. Femtosecond laser shock peening is a new possibility of direct laser ablation without any protective layer under atmospheric conditions, which can produce intense shock waves with low pulse energy in the air. The average surface roughness values of the NiTi alloy samples were measured, because the surface roughness may affect its friction resistance. The results showed that the surface roughness of NiTi increased after femtosecond laser shock peening treatment. In comparison with the initial state, the coefficient of friction decreased and surface microhardness increased after femtosecond laser shock peening treatment with different FsLSP parameters. This improvement of wear properties may be attributed to the enhancement of surface microhardness and surface titanium oxide layer induced by the shock wave and laser ablation during FsLSP treatment.}, language = {en} } @inproceedings{SurkampZylaGurevichetal.2020, author = {Surkamp, N and Zyla, G and Gurevich, EL and Esen, C and Klehr, A and Knigge, A and Ostendorf, A and Hofmann, MR}, title = {Mode-locked diode lasers as sources for two-photon polymerization}, series = {3D Printed Optics and Additive Photonic Manufacturing II}, booktitle = {3D Printed Optics and Additive Photonic Manufacturing II}, publisher = {International Society for Optics and Photonics}, address = {USA}, doi = {10.1117/12.2555890}, pages = {113490G -- 113490G}, year = {2020}, abstract = {In this study, we use a hybrid mode-locked external cavity diode laser with subsequent amplification and pulse compression. The system provides laser pulses of 440 fs width (assuming a sech² pulse shape) and 160 mW average output power at a repetition rate of 383.1 MHz. The laser oscillator consists of a double quantum well laser diode with a gain segment of 1080 μm length and an absorber element of 80 μm lengths. The chip's back facet is covered with a high reflective coating, the front facet with an anti-reflective coating. The resonator itself is operated in a collimated geometry and folded by two dielectric mirrors. The used output coupler provides a transmission of 20 percent, which is coupled into a tapered amplifier. Two Faraday isolators are used to decouple the laser and the amplifier from any back reflections. Subsequently, the pulses are compressed using a single pass Martinez type pulse compressor …}, language = {en} } @article{PavlovGurbatovKudryashovetal.2020, author = {Pavlov, DV and Gurbatov, SO and Kudryashov, SI and Gurevich, EL and Kuchmizhak, AA}, title = {Laser-induced surface relief nanocrowns as a manifestation of nanoscale Rayleigh-Plateau hydrodynamic instability}, series = {Applied Surface Science}, volume = {511/2020}, journal = {Applied Surface Science}, doi = {10.1016/j.apsusc.2020.145463}, pages = {145463 -- 145463}, year = {2020}, abstract = {Nanoscale hydrodynamic instability of ring-like molten rims around ablative microholes produced in nanometer-thick silver and gold films by tightly focused nanosecond (ns) laser pulses was experimentally explored in terms of laser pulse energy and film thickness. These parametric dependencies of basic instability characteristics - order and period of the resulting nanocrowns - were analyzed, revealing its apparently Rayleigh-Plateau character, as compared to much less consistent possible van der Waals and impact origins. Along with fundamental importance, these findings will put forward ns pulsed laser ablation as an alternative facile inexpensive table-top approach to study such hydrodynamic instabilities developing at ns temporal and nanometer spatial scales as well as to produce unique plasmon-active hierarchical surface morphologies applicable for chemo- and biosensing.}, language = {en} } @article{PuesLaubeFischeretal.2021, author = {Pues, Patrick and Laube, Michael and Fischer, Stefan and Schr{\"o}der, Franziska and Schwung, Sebastian and Rytz, Daniel and Fiehler, Torben and Wittrock, Ulrich and J{\"u}stel, Thomas}, title = {Luminescence and up-conversion of single crystalline Lu3Al5O12:Pr3+}, series = {Journal of Luminescence}, volume = {234}, journal = {Journal of Luminescence}, doi = {10.1016/j.jlumin.2021.117987}, pages = {117987 -- 117995}, year = {2021}, abstract = {This work deals with the spectroscopic properties of praseodymium doped single crystalline lutetium aluminum garnet (LuAG:Pr3+). A special focus was set on temperature- and time-dependent spectroscopy. Beyond the well-known down-conversion luminescence of LuAG:Pr3+, also UV-A/B up-conversion luminescence under excitation with a 488 nm laser was thoroughly investigated. Furthermore, the results of the spectroscopic investigations on the single crystalline material were supplemented and compared with measurements on a microscale powder sample. In addition, to the spectroscopic investigations, mechanistic considerations are presented to obtain a closer look at the up-conversion process in LuAG:Pr3+. We promote the thesis of a temperature-dependent energy transfer up-conversion mechanism.}, language = {en} } @article{SyubaevMitsaiPorfirevetal.2020, author = {Syubaev, S. and Mitsai, E. and Porfirev, A. and Khonina, S. and Kudryashov, S. and Katkus, T. and Juodkazis, S. and Gurevich, E. L. and Kuchmizhak, A.}, title = {Silicon microprotrusions with tailored chirality enabled by direct femtosecond laser ablation}, series = {Optics Letters}, volume = {45}, journal = {Optics Letters}, number = {11}, doi = {10.1364/OL.393979}, pages = {3050 -- 3053}, year = {2020}, abstract = {Here, we report on formation of nanoprotrusions on the surface of a bulk crystalline silicon wafer under femtosecond-laser ablation with a donut-shaped laser beam. By breaking circular symmetry of the irradiating donut-shaped fs-pulse beam, a switch in geometry of the formed surface nanoprotrusions from regular to chiral was demonstrated. The chirality of the obtained Si nanostructures was promoted with an asymmetry degree of the laser beam. An uneven helical flow of laser-melted Si caused by asymmetry of the initial intensity and temperature pattern on the laser-irradiated Si surface explains this phenomenon. Chirality of the formed protrusions was confirmed by visualizing cross-sectional cuts produced by focused ion beam milling as well as Raman activity of these structures probed by circularly polarized light with opposite handedness. Our results open a pathway towards easy-to-implement inexpensive …}, language = {en} } @article{WangKalchevWangetal.2020, author = {Wang, Hao and Kalchev, Yordan and Wang, Hongcai and Yan, Kai and Gurevich, Evgeny L and Ostendorf, Andreas}, title = {Surface modification of NiTi alloy by ultrashort pulsed laser shock peening}, series = {Surface and Coatings Technology}, volume = {394}, journal = {Surface and Coatings Technology}, doi = {10.1016/j.surfcoat.2020.125899}, pages = {125899 -- 125899}, year = {2020}, abstract = {This research paper presents the attempt at ultrashort pulsed laser shock peening with absence of absorptive layer and confining medium which could enhance surface microhardness and the abrasion property of NiTi shape memory alloy. The average roughness values of NiTi specimen were measured on the surface, because the roughness would affect the friction resistance. The microhardness and Young's modulus were investigated at different position of single laser spot by nanoindentation technique. The pin-on-plate sliding abrasion testing were performed with different load-force (0.5 N and 2 N) for different testing time. Results showed that ultrashort pulsed laser shock peening treatment would cause a significant improvement on friction coefficient and abrasion property, which was attributed to the change of surface modification, such as roughness, microhardness, microstructure and titanium oxide layer …}, language = {en} } @article{ZylaSurkampGurevichetal.2020, author = {Zyla, Gordon and Surkamp, Nils and Gurevich, Evgeny L and Esen, Cemal and Klehr, Andreas and Knigge, Andrea and Hofmann, Matin R and Ostendorf, Andreas}, title = {Two-photon polymerization with diode lasers emitting ultrashort pulses with high repetition rate}, series = {Optics Letters}, volume = {45}, journal = {Optics Letters}, number = {17}, doi = {10.1364/OL.401738}, pages = {4827 -- 4830}, year = {2020}, abstract = {In this Letter, we investigate the resolution of two-photon polymerization (2PP) with an amplified mode-locked external cavity diode laser with adjustable pulse length and a high repetition rate. The experimental results are analyzed with a newly developed 2PP model. Even with low pulse peak intensity, the produced structural dimensions are comparable to those generated by traditional 2PP laser sources. Thus, we show that a compact monolithic picosecond laser diode without amplification and with a repetition rate in the GHz regime can also be applied for 2PP. These results show the high application potential of compact mode-locked diode lasers for low-cost and compact 2PP systems.}, language = {en} } @article{ZylaKovalevGurevichetal.2020, author = {Zyla, Gordon and Kovalev, Alexander and Gurevich, Evgeny L and Esen, Cemal and Liu, Ying and Lu, Yongfeng and Gorb, Stanislav and Ostendorf, Andreas}, title = {Structural colors with angle-insensitive optical properties generated by Morpho-inspired 2PP structures}, series = {Applied Physics A}, volume = {126}, journal = {Applied Physics A}, number = {9}, doi = {10.1007/s00339-020-03931-6}, pages = {740 -- 740}, year = {2020}, abstract = {This paper describes how two-photon polymerization was used to generate biomimetic nanostructures with angle-insensitive coloration inspired by the blue butterflies of Morpho. Less angle dependence was achieved by engineering the structures with a certain degree of disorder, which delimited them from classical photonic crystals. Variations in the processing parameters enabled the color hue to be controlled. In this context, blue, green, yellow, and brown structures were demonstrated. Reflection spectra of the structures were simulated and studied experimentally in a broad range of incident angles. Additionally, a molding technique was performed as a potential scale-up strategy. The application of such biomimetic structures is discussed.}, language = {en} } @article{GurevichLevyBulgakova2020, author = {Gurevich, Evgeny L and Levy, Yoann and Bulgakova, Nadezhda M}, title = {Three-Step Description of Single-Pulse Formation of Laser-Induced Periodic Surface Structures on Metals}, series = {Nanomaterials}, volume = {10}, journal = {Nanomaterials}, number = {9}, doi = {10.3390/nano10091836}, pages = {1836 -- 1836}, year = {2020}, abstract = {Two different scenarios are usually invoked in the formation of femtosecond Laser-Induced Periodic Surface Structures (LIPSS), either "self-organization" mechanisms or a purely "plasmonic" approach. In this paper, a three-step model of formation of single-laser-shot LIPSS is summarized. It is based on the periodic perturbation of the electronic temperature followed by an amplification, for given spatial periods, of the modulation in the lattice temperature and a final possible relocation by hydrodynamic instabilities. An analytical theory of the evolution of the temperature inhomogeneities is reported and supported by numerical calculations on the examples of three different metals: Al, Au, and Mo. The criteria of the possibility of hydrodynamic instabilities are also discussed.}, language = {en} } @article{ElangoHoppiusKukrejaetal.2020, author = {Elango, Kishore and Hoppius, Jan S and Kukreja, Lalit M and Ostendorf, Andreas and Gurevich, Evgeny L}, title = {Studies on ultra-short pulsed laser shock peening of stainless-steel in different confinement media}, series = {Surface and Coatings Technology}, volume = {397}, journal = {Surface and Coatings Technology}, doi = {10.1016/j.surfcoat.2020.125988}, pages = {125988 -- 125988}, year = {2020}, abstract = {We investigate the role of liquid confinement media on ultra-short pulsed Laser Shock Peening (LSP). The LSP of stainless-steel 316 and 316 L was studied using Ti: Sapphire laser pulses of about 2 ps duration, maximum energy of about 1 mJ and pulse repetition rate of 5 kHz in different liquid confinement media of Ethanol, Deionized water and separate aqueous solutions of NaCl and Glycerol. It is found that the laser fluence and/or energy attenuating mechanisms like self-focusing, filamentation, plasma breakdown in the confinement media are less significant with ps laser pulses than those with sub-ps or fs pulse durations. It is shown that the resulting surface hardness of the peened steel as a function of laser fluence depends significantly on the confinement media and the relative increase in the hardness increases monotonically with the acoustic impedance of the liquid of the confinement medium used during …}, language = {en} }