@phdthesis{Koenig, author = {K{\"o}nig, Franziska}, title = {Investigation of High Reynolds Number Pipe Flow}, publisher = {Cuvillier}, address = {G{\"o}ttingen}, isbn = {978-3-73699-049-4}, language = {en} } @incollection{OenguenerZanounKoenigetal., author = {{\"O}ng{\"u}ner, Emir and Zanoun, El-Sayed and K{\"o}nig, Franziska and Egbers, Christoph}, title = {Structure Investigation in Pipe Flow at High Reynolds Numbers}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-319-29130-7}, pages = {217 -- 220}, language = {en} } @inproceedings{OenguenerKoenigZanounetal., author = {{\"O}ng{\"u}ner, Emir and K{\"o}nig, Franziska and Zanoun, El-Sayed and Egbers, Christoph}, title = {Experimentelle Untersuchung der turbulenten Rohrstrukturen bei hohen Reynolds Zahlen}, series = {GALA - Fachtagung Lasermethoden in der Str{\"o}mungsmesstechnik, 22. Fachtagung, 9. - 11. September 2014, Karlsruhe}, booktitle = {GALA - Fachtagung Lasermethoden in der Str{\"o}mungsmesstechnik, 22. Fachtagung, 9. - 11. September 2014, Karlsruhe}, publisher = {GALA}, address = {Karlsruhe}, isbn = {978-3-9816764-0-2}, pages = {S. 24}, language = {de} } @inproceedings{ZanounKoenigAlMutairietal., author = {Zanoun, El-Sayed and K{\"o}nig, Franziska and Al-Mutairi, Fahad M. and Egbers, Christoph and {\"O}ng{\"u}ner, Emir}, title = {On the Application of Hot Wires and Pitot Tubes in Pipe and Channel Flows}, series = {HEFAT 2014, 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 6 - 9 July 2014 Orlando, Florida}, booktitle = {HEFAT 2014, 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 6 - 9 July 2014 Orlando, Florida}, doi = {10.13140/2.1.3766.7521}, pages = {7}, language = {en} } @misc{SchulzeSeidlitzKoenigetal., author = {Schulze, Marcus and Seidlitz, Holger and K{\"o}nig, Franziska and Weiß, Sabine}, title = {Nanoindentation measurements of PVD coated multilayer constructions}, series = {Journal of Achievements in Materials and Manufacturing Engineering}, volume = {72}, journal = {Journal of Achievements in Materials and Manufacturing Engineering}, number = {2}, issn = {1734-8412}, pages = {53 -- 60}, abstract = {Carbon fibre reinforced thermoplastics (CFRP) are intensively used in lightweight applications due to their high strength to weight ratio. In addition they offer good crash, damping and recycling properties. On the basis of their morphology they are suitable for large scale manufacturing processes. A major disadvantage consists of its poor hardness properties, which is again an important requirement to realize a good erosion and wear behaviour. Design/methodology/approach: In this work the application of orthotropic carbon fibre reinforced polymers (PA6), with protective TiAlN coatings, produced by physical vapor deposition (PVD), is investigated. The characterization of the coating is performed by nanoindentation tests, roughness measurements and scanning electron microscopy. Furthermore micro hardness tests on selected well prepared cross sections are conducted, to compare the coating quality with established coating systems. Findings: By applying TiAlN coating, the hardness of the CFRP samples can be increased substantially up to 15 GPa, in comparison to the basic substrate. In addition the quality of the coating surface can be improved significantly by plasma etching pre-treatment. Research limitations/implications: The presented findings are preliminary results to prove the application of a standard processed ceramic coating on new composite types for mass production. The PVD coating process as well as the utilized testing methods are suitable to realize hard coatings on thermoplastic CFRP. This effect can be exploited for several lightweight applications to increase the erosion and wear resistance of composite materials. Originality/value: The presented results show, that ceramic coatings can be deposited on standard thermoplastic CFRP with polyamide 6 matrix. Therewith it can be expected, that the PVD coating process can make a essential contribution to increase the range of applications.}, language = {en} } @misc{KoenigZanounOengueneretal., author = {K{\"o}nig, Franziska and Zanoun, El-Sayed and {\"O}ng{\"u}ner, Emir and Egbers, Christoph}, title = {The CoLaPipe - The new Cottbus large pipe test facility at Brandenburg University of Technology Cottbus-Senftenberg}, series = {Review of scientific instruments}, volume = {85}, journal = {Review of scientific instruments}, number = {7}, issn = {1089-7623}, doi = {10.1063/1.4884717}, pages = {075115-1 -- 075115-9}, language = {en} } @misc{KoenigZanounJehringetal., author = {K{\"o}nig, Franziska and Zanoun, El-Sayed and Jehring, Lothar and Egbers, Christoph}, title = {On the behavior of the inner peak in turbulent pipe flow}, language = {en} } @misc{SchulzeSeidlitzKoenigetal., author = {Schulze, Marcus and Seidlitz, Holger and K{\"o}nig, Franziska and Weiß, Sabine}, title = {Tribological Investigations of PVD Coated Multi-Layer Constructions}, series = {Journal of Materials Science Research}, volume = {5}, journal = {Journal of Materials Science Research}, number = {1}, issn = {1927-0585}, doi = {10.5539/jmsr.v5n1p97}, pages = {97 -- 106}, abstract = {Multi-layer constructions become more and more relevant in lightweight applications due to their high strength to weight ratio. They offer excellent crash, damping and recycling properties. Also, the morphology of thermoplastic carbon fibre reinforced plastics (CFRP) render them interesting for large scale manufacturing processes. Nevertheless, a major disadvantage results in a poor resistance against wear and tear, e.g. erosion, which is attributed to weak hardness properties. Hence, this work deals with tribological investigations on orthotropic carbon fibre reinforced polymers (PA 6) either with protective ceramic coating or without. The chosen coating system is a well-known protective covering of metal components, e.g. metal cutting tools, produced by physical vapor deposition (PVD). To characterize the coating system on thermoplastic CFRP, standard analyzing methods are utilized, like optical and scanning electron microscopy (SEM). The tribological investigations are conducted by the tribological ball on disk method to generate wear tracks on the sample surfaces and hence to calculate the wear rates. These results are compared to literature findings with respect to a certain protective coating system (TiN) and a second nano-structured gel coating system, where both systems are deposited on a thermosetting material, i.e. carbon fibre reinforced epoxy resin, respectively. For this purpose the feasibility of depositing a protective ceramic layer on thermoplastic CFRP is demonstrated. First results on suitable surface pre-treatments have shown a significant influence on the coating quality. The improved performance regarding the wear behavior with respect to tribology compared to the poor substrate and existing technologies is shown additionally.}, language = {en} } @misc{SchulzeSeidlitzKoenigetal., author = {Schulze, Marcus and Seidlitz, Holger and K{\"o}nig, Franziska and Weiß, Sabine}, title = {Highly wear resistant PVD coatings for CFRP based multi-layer construction}, series = {11th International Scientific-Technical Conference on Advances in Plastics Technology (APT'15)}, journal = {11th International Scientific-Technical Conference on Advances in Plastics Technology (APT'15)}, address = {Gliwice}, isbn = {978-83-63555-47-4}, language = {en} } @inproceedings{SchulzeSeidlitzKoenigetal., author = {Schulze, Marcus and Seidlitz, Holger and K{\"o}nig, Franziska and Weiß, Sabine}, title = {Nanoindentation measurements of PVD coated multilayer constructions}, series = {Programme and proceedings of the 22nd Winter International Scintific Conference on Achivements in Mechanical and Materials Engineering (AMME'15), Gliwice - Zakopane (Poland), 2015}, booktitle = {Programme and proceedings of the 22nd Winter International Scintific Conference on Achivements in Mechanical and Materials Engineering (AMME'15), Gliwice - Zakopane (Poland), 2015}, editor = {Dobrzański, Leszek A.}, publisher = {Gliwice}, address = {International OCSCO World Press}, isbn = {978-83-63553-39-5}, language = {en} } @misc{SchulzeMerzThieretal., author = {Schulze, Susanne and Merz, Sibille and Thier, Anne and Tallarek, Marie and K{\"o}nig, Franziska and Uhlenbrock, Greta and N{\"u}bling, Matthias and Lincke, Hans-Joachim and Rapp, Michael A. and Spallek, Jacob and Holmberg, Christine}, title = {Psychosocial burden in nurses working in nursing homes during the Covid-19 pandemic: a cross-sectional study with quantitative and qualitative data}, series = {BMC health services research}, volume = {22}, journal = {BMC health services research}, issn = {1472-6963}, doi = {10.1186/s12913-022-08333-3}, pages = {1 -- 13}, abstract = {Background: The Covid-19 pandemic led to increased work-related strain and psychosocial burden in nurses worldwide, resulting in high prevalences of mental health problems. Nurses in long-term care facilities seem to be especially affected by the pandemic. Nevertheless, there are few findings indicating possible positive changes for health care workers. Therefore, we investigated which psychosocial burdens and potential positive aspects nurses working in long-term care facilities experience during the Covid-19 pandemic. Methods: We conducted a mixed-methods study among nurses and nursing assistants working in nursing homes in Germany. The survey contained the third German version of the Copenhagen Psychosocial Questionnaire (COPSOQ III). Using Welch's t-tests, we compared the COPSOQ results of our sample against a pre-pandemic reference group of geriatric nurses from Germany. Additionally, we conducted semi-structured interviews with geriatric nurses with a special focus on psychosocial stress, to reach a deeper understanding of their experiences on work-related changes and burdens during the pandemic. Data were analysed using thematic coding (Braun and Clarke). Results: Our survey sample (n = 177) differed significantly from the pre-pandemic reference group in 14 out of 31 COPSOQ scales. Almost all of these differences indicated negative changes. Our sample scored significantly worse regarding the scales 'quantitative demands', 'hiding emotions', 'work-privacy conflicts', 'role conflicts', 'quality of leadership', 'support at work', 'recognition', 'physical demands', 'intention to leave profession', 'burnout', 'presenteeism' and 'inability to relax'. The interviews (n = 15) revealed six main themes related to nurses' psychosocial stress: 'overall working conditions', 'concern for residents', 'management of relatives', 'inability to provide terminal care', 'tensions between being infected and infecting others' and 'technicisation of care'. 'Enhanced community cohesion' (interviews), 'meaning of work' and 'quantity of social relations' (COPSOQ III) were identified as positive effects of the pandemic. Conclusions: Results clearly illustrate an aggravation of geriatric nurses' situation and psychosocial burden and only few positive changes due to the Covid-19 pandemic. Pre-existing hardships seem to have further deteriorated and new stressors added to nurses' strain. The perceived erosion of care, due to an overemphasis of the technical in relation to the social and emotional dimensions of care, seems to be especially burdensome to geriatric nurses.}, language = {en} }