@article{PangerlMuellerRuecketal., author = {Pangerl, Jonas and M{\"u}ller, Max and R{\"u}ck, Thomas and Weigl, Stefan and Bierl, Rudolf}, title = {Characterizing a sensitive compact mid-infrared photoacoustic sensor for methane, ethane and acetylene detection considering changing ambient parameters and bulk composition (N2, O2 and H2O)}, series = {Sensors and Actuators B: Chemical}, volume = {352,1}, journal = {Sensors and Actuators B: Chemical}, publisher = {Elsevier}, doi = {10.1016/j.snb.2021.130962}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-25868}, pages = {1 -- 12}, abstract = {We present a sensitive and compact interband cascade laser (ICL) based photoacoustic setup for the detection of gaseous hydrocarbons and discuss its applicability towards trace gas analysis. We investigated the performance of the sensor for trace concentrations of methane, ethane and acetylene diluted in nitrogen. The excitation of methane and ethane was accomplished using one tunable diode laser, covering a range from 3360 to 3372 nm, which was replaced by a separate ICL at 3025 nm for acetylene detection. The influence of ambient parameters such as temperature, flow rate and pressure as well as potential cross-sensitivities towards O2 and H2O have been examined in terms of methane and acetylene detection. A series of simulations proved several of these influences to be attributed to relaxation effects. With a 3σ limit of detection (LoD) of 6.8 parts per billion (ppbV) in case of methane, 2.3 ppbV regarding ethane and 3.6 ppbV in terms of acetylene, the sensor demonstrates a great potential for applications in the field of trace gas analysis.}, language = {en} } @article{BurdinEkonomovChashinetal., author = {Burdin, Dmitrii A. and Ekonomov, Nikolai A. and Chashin, Dmitri V. and Fetisov, Leonid Y. and Fetisov, Yuri K. and Shamonin (Chamonine), Mikhail}, title = {Temperature Dependence of the Resonant Magnetoelectric Effect in Layered Heterostructures}, series = {Materials}, volume = {10}, journal = {Materials}, number = {10}, publisher = {MDPI}, doi = {10.3390/ma10101183}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-32185}, abstract = {The dependence of the resonant direct magnetoelectric effect on temperature is studied experimentally in planar composite structures. Samples of rectangular shapes with dimensions of 5 mm x 20 mm employed ferromagnetic layers of either an amorphous (metallic glass) alloy or nickel with a thickness of 20-200 m and piezoelectric layers of single crystalline langatate material or lead zirconate titanate piezoelectric ceramics with a thickness of 500 m. The temperature of the samples was varied in a range between 120 and 390 K by blowing a gaseous nitrogen stream around them. It is shown that the effective characteristics of the magnetoelectric effectsuch as the mechanical resonance frequency f(r), the quality factor Q and the magnitude of the magnetoelectric coefficient (E) at the resonance frequencyare contingent on temperature. The interrelations between the temperature changes of the characteristics of the magnetoelectric effect and the temperature variations of the following material parametersYoung's modulus Y, the acoustic quality factor of individual layers, the dielectric constant epsilon, the piezoelectric modulus d of the piezoelectric layer as well as the piezomagnetic coefficients ((n)) of the ferromagnetic layerare established. The effect of temperature on the characteristics of the nonlinear magnetoelectric effect is observed for the first time. The results can be useful for designing magnetoelectric heterostructures with specified temperature characteristics, in particular, for the development of thermally stabilized magnetoelectric devices.}, language = {en} } @article{MonkmanSindersbergerPrem, author = {Monkman, Gareth J. and Sindersberger, Dirk and Prem, Nina}, title = {Magnetically enhanced photoconductive high voltage control}, series = {ISSS Journal of Micro and Smart Systems}, volume = {11}, journal = {ISSS Journal of Micro and Smart Systems}, publisher = {Springer Nature}, doi = {10.1007/s41683-021-00088-z}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-30606}, pages = {317 -- 328}, abstract = {The recent surge of interest in electrostatic actuators, particularly for soft robotic applications, has placed increasing demands on high voltage control technology. In this respect, optoelectronic bidirectional switching and analogue regulation of high voltages is becoming increasingly important. One common problem is the leakage current due to dark resistance of the material or device used. Another is the physical size of such elements. However, their ability to provide galvanic separation makes them a very attractive alternative to conventional (wired) semiconductor elements. This paper gives an overview of available methods and devices before introducing a concept based on the combination of photoresistive and magnetoresistive effects in Gallium Arsenide that are potentially applicable to other semiconductor materials.}, language = {en} } @inproceedings{DiehlWolffFuhrmannetal., author = {Diehl, Andreas and Wolff, Lilli and Fuhrmann, Thomas and Niemetz, Michael and M{\"o}rtlbauer, Stefanie and Dirnberger, Sandra}, title = {Compact Freshmen Welcome Seminar for Engineering Students}, series = {Procedia - Social and Behavioral Sciences}, booktitle = {Procedia - Social and Behavioral Sciences}, number = {228}, publisher = {Elsevier}, doi = {10.1016/j.sbspro.2016.07.007}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-31034}, pages = {45 -- 52}, abstract = {The Faculty of Electrical Engineering and Information Technology of the OTH Regensburg developed and implemented a compact freshmen seminar for the afternoon of the first day of study. The intention of this seminar is to help the freshmen during their transition between school and study without losing lecture time in the first semester. The concept was tested with one small study group at the beginning of the summer semester 2015. To rate the impact of the seminar and to find aspects for continuous improvement an evaluation method was developed and used. Due to the good student resonance during the first run, this introduction seminar was held again in the winter semester 2015/16. It is planned to integrate this seminar as a regular session for all freshmen of the faculty curriculum and monitor the long-term effects of student motivation and success.}, language = {en} } @misc{Westner, author = {Westner, Markus}, title = {Rezension "Designed for Digital".}, series = {HMD Praxis Der Wirtschaftsinformatik}, journal = {HMD Praxis Der Wirtschaftsinformatik}, publisher = {Springer Nature}, doi = {10.1365/s40702-022-00877-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-38626}, language = {de} } @article{GradNadammalSchultheissetal., author = {Grad, Marius and Nadammal, Naresh and Schultheiss, Ulrich and Lulla, Philipp and Noster, Ulf}, title = {An Integrative Experimental Approach to Design Optimization and Removal Strategies of Supporting Structures Used during L-PBF of SS316L Aortic Stents}, series = {Applied Sciences}, volume = {11}, journal = {Applied Sciences}, number = {19}, publisher = {MPDL}, doi = {10.3390/app11199176}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-25612}, pages = {1 -- 22}, abstract = {One of the fundamental challenges in L-PBF of filigree geometries, such as aortic stents used in biomedical applications, is the requirement for a robust yet easily removable support structure that allows each component to be successfully fabricated without distortion. To solve this challenge, an integrative experimental approach was attempted in the present study by identifying an optimal support structure design and an optimized support removal strategy for this design. The specimens were manufactured using four different support structure designs based on the geometry exposed to the laser beam during the L-PBF. Support removal procedures included sand blasting (SB), glass bead blasting (GB), and electrochemical polishing (ECP). The two best-performing designs (line and cross) were chosen due to shorter lead times and lower material consumption. As an additional factor that indicates a stable design, the breaking load requirement to remove the support structures was determined. A modified line support with a 145° included angle was shown to be the best support structure design in terms of breaking load, material consumption, and manufacturing time. All three procedures were used to ensure residue-free support removal for this modified line support design, with ECP proving to be the most effective.}, language = {en} } @article{SternerSpecht, author = {Sterner, Michael and Specht, Michael}, title = {Power-to-Gas and Power-to-X-The History and Results of Developing a New Storage Concept}, series = {Energies}, volume = {14}, journal = {Energies}, number = {20}, publisher = {MDPI}, doi = {10.3390/en14206594}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-26202}, abstract = {Germany's energy transition, known as 'Energiewende', was always very progressive. However, it came technically to a halt at the question of large-scale, seasonal energy storage for wind and solar, which was not available. At the end of the 2000s, we combined our knowledge of both electrical and process engineering, imitated nature by copying photosynthesis and developed Power-to-Gas by combining water electrolysis with CO2-methanation to convert water and CO2 together with wind and solar power to synthetic natural gas. Storing green energy by coupling the electricity with the gas sector using its vast TWh-scale storage facility was the solution for the biggest energy problem of our time. This was the first concept that created the term 'sector coupling' or 'sectoral integration'. We first implemented demo sites, presented our work in research, industry and ministries, and applied it in many macroeconomic studies. It was an initial idea that inspired others to rethink electricity as well as eFuels as an energy source and energy carrier. We developed the concept further to include Power-to-Liquid, Power-to-Chemicals and other ways to 'convert' electricity into molecules and climate-neutral feedstocks, and named it 'Power-to-X'at the beginning of the 2010s.}, language = {en} } @article{Schiek, author = {Schiek, Roland}, title = {Excitation of nonlinear beams: from the linear Talbot effect through modulation instability to Akhmediev breathers}, series = {Optics express}, volume = {29}, journal = {Optics express}, number = {10}, publisher = {Optica Publishing Group}, address = {Washington, DC, USA}, doi = {10.1364/OE.425626}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-26049}, pages = {15830 -- 15851}, abstract = {The smooth transition between stable, Talbot-effect-dominated and modulationally unstable nonlinear optical beam propagation is described as the superposition of oscillating, growing and decaying eigenmodes of the common linearized theory of modulation instability. The saturation of the instability in form of breather maxima is embedded between eigenmode growth and decay. This explains well the changes of beam characteristics when the input intensity increases in experiments on modulation instability and breather excitation in spatial-spatial experimental platforms. An increased accuracy of instability gain measurements, a variety of interesting nonlinear beam scenarios and a more selective and well-directed breather excitation are demonstrated experimentally.}, language = {en} } @article{Schildgen, author = {Schildgen, Johannes}, title = {Interaktive Vorlesungsfolien mit SQL-Unterst{\"u}tzung}, series = {Datenbank-Spektrum}, volume = {21}, journal = {Datenbank-Spektrum}, number = {1}, publisher = {Springer Nature}, doi = {10.1007/s13222-020-00364-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-26059}, pages = {19 -- 27}, abstract = {Mit PowerPoint oder LaTeX Beamer erstellte Vorlesungsfolien sind meist statisch und dienen haupts{\"a}chlich der Pr{\"a}sentation von Lehrinhalten. Als Alternative dazu werden drei Erweiterungen f{\"u}r das HTML- und JavaScript-basierte Pr{\"a}sentationsframework reveal.js vorgestellt, die f{\"u}r mehr Interaktion in der Datenbankenlehre sorgen sollen: (1) Eine Live-Ausf{\"u}hrung von SQL-Anfragen und eine Darstellung des Anfrageergebnisses direkt auf der Folie; mit M{\"o}glichkeit zur Anpassung der Anfrage im Pr{\"a}sentationsbetrieb, (2) eine JSON-basierte Beschreibung von ER-Diagrammen, welche graphisch auf den Folien dargestellt werden sollen und (3) eingebettete Smartphone-Umfragen, um zwischendurch - ohne einen Kontextwechsel - Quiz-Fragen zu stellen.}, language = {de} } @article{MonkmanStrieglPremetal., author = {Monkman, Gareth J. and Striegl, Birgit and Prem, Nina and Sindersberger, Dirk}, title = {Electrical Properties of Magnetoactive Boron-Organo-Silicon Oxide Polymers}, series = {Macromolecular Chemistry and Physics}, volume = {221}, journal = {Macromolecular Chemistry and Physics}, number = {4}, publisher = {Wiley}, doi = {10.1002/macp.201900342}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-26488}, pages = {1 -- 8}, abstract = {The electrical properties of rheopectic magnetoactive composites comprising boron-organo-silicon oxide dielectric matrices containing carbonyl iron microparticles are presented for the first time. The increase in interfacial magnetocapacitance is seen to greatly exceed that experienced when using conventional elastomeric matrices such as polydimethylsiloxane. In addition to the increase in capacitance, a simultaneous and sharp decrease in the parallel electrical resistance over several orders of magnitude is also observed. The effects are time dependent but repeatable. Potential applications include magnetically controlled frequency dependent devices, magnetic sensor systems, weighting elements for neural networks, etc.}, language = {en} } @article{PremSindersbergerMonkman, author = {Prem, Nina and Sindersberger, Dirk and Monkman, Gareth J.}, title = {Infrared spectral analysis of low concentration magnetoactive polymers}, series = {Journal of Applied Polymer Science}, volume = {137}, journal = {Journal of Applied Polymer Science}, number = {7}, publisher = {Wiley}, organization = {WILEY}, issn = {1097-4628}, doi = {10.1002/app.48366}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-25913}, pages = {1 -- 7}, abstract = {This work concerns an area of magnetoactive polymer (MAP) research seldom considered. Traditionally only MAP with high concentrations of magnetic filler (typically between 10 and 90 wt\%) have been investigated. This article deals with a hitherto neglected aspect of research, namely MAP containing lower magnetic filler concentrations (1 to 3 wt\%). This article utilizes a range of spectroscopic analysis methods (Raman and FTIR) and their applicability to MAP characterization at wavelengths ranging from 2.5 to 25 mu m. Particular attention is paid to low carbonyl iron particle (CIP) concentrations in MAP for which the emergence of capillary doublets at a critical 2 wt\% concentration is revealed. This results in measurable magnetic field-dependent changes in IR absorption at a wavelength of 4.255 mu m together with a detectable CO2 susceptibility. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48366.}, language = {en} } @article{Chow, author = {Chow, Rosan}, title = {Moving forward together}, series = {Strategic Design Research Journal}, volume = {11}, journal = {Strategic Design Research Journal}, number = {2}, publisher = {OJS/PKP}, doi = {10.4013/sdrj.2018.112.14}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-29007}, pages = {167 -- 169}, language = {en} } @article{MuellerRueckJobstetal., author = {M{\"u}ller, Max and R{\"u}ck, Thomas and Jobst, Simon and Pangerl, Jonas and Weigl, Stefan and Bierl, Rudolf and Matysik, Frank-Michael}, title = {An Algorithmic Approach to Compute the Effect of Non-Radiative Relaxation Processes in Photoacoustic Spectroscopy}, series = {Photoacoustics}, volume = {26}, journal = {Photoacoustics}, publisher = {Elsevier}, doi = {10.1016/j.pacs.2022.100371}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-39935}, abstract = {Successful transfer of photoacoustic gas sensors from laboratory to real-life applications requires knowledge about potential cross-sensitivities towards environmental and gas matrix changes. Multi-dimensional calibration in case of cross-sensitivities can become very complex or even unfeasible. To address this challenge, we present a novel algorithm to compute the collision based non-radiative efficiency and phase lag of energy relaxation on a molecular level (CoNRad) for photoacoustic signal calculation. This algorithmic approach allows to calculate the entire elaxation cascade of arbitrarily complex systems, yielding a theoretical photoacoustic signal. In this work the influence of varying bulk compositions, i.e. nitrogen (N2), oxygen (O2) and water (H2O) on the photoacoustic signal during methane (CH4) detection is demonstrated. The applicability of the algorithm to other photoacoustic setups is shown exemplary by applying it to the relaxational system investigated in [1]. Hayden et al. examined the effect of water on photoacoustic carbon monoxide (CO) detection.}, language = {en} } @article{Goertler, author = {G{\"o}rtler, Michael}, title = {Rechtspopulismus als (komplexe) Problemstellung der Sozialen Arbeit}, series = {Soziale Passagen : Journal f{\"u}r Empirie und Theorie Sozialer Arbeit}, volume = {14}, journal = {Soziale Passagen : Journal f{\"u}r Empirie und Theorie Sozialer Arbeit}, publisher = {Springer Nature}, doi = {10.1007/s12592-022-00408-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-45323}, pages = {193 -- 199}, abstract = {Dieser Beitrag enth{\"a}lt {\"U}berlegungen zum Rechtspopulismus als (komplexe) Problemstellung der Sozialen Arbeit. Eine theoretisch-reflexive Analyse p{\"a}dagogischer und didaktischer Ans{\"a}tze, eine qualitative Analyse zu Herausforderungen und Bew{\"a}ltigungsstrategien von Fachkr{\"a}ften in der Kinder- und Jugendhilfe sowie eine Analyse aktueller Ver{\"o}ffentlichungen und Stellungnahmen im Kontext des Rechtspopulismus legen die Vermutung nahe, dass sich die Soziale Arbeit aufgrund der Komplexit{\"a}t dieses gesellschaftlichen und politischen Ph{\"a}nomens in einer Suchbewegung befindet.}, language = {de} } @article{GaertnerMarxSchubachGadereretal., author = {G{\"a}rtner, Sebastian and Marx-Schubach, Thomas and Gaderer, Matthias and Schmitz, Gerhard and Sterner, Michael}, title = {Techno-Economic Analysis of Carbon Dioxide Separation for an Innovative Energy Concept towards Low-Emission Glass Melting}, series = {energies}, volume = {16}, journal = {energies}, number = {5}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/en16052140}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-53627}, pages = {1 -- 25}, abstract = {The currently still high fossil energy demand is forcing the glass industry to search for innovative approaches for the reduction in CO2 emissions and the integration of renewable energy sources. In this paper, a novel power-to-methane concept is presented and discussed for this purpose. A special focus is on methods for the required CO2 capture from typical flue gases in the glass industry, which have hardly been explored to date. To close this research gap, process simulation models are developed to investigate post-combustion CO2 capture by absorption processes, followed by a techno-economic evaluation. Due to reduced flue gas volume, the designed CO2 capture plant is found to be much smaller (40 m3 absorber column volume) than absorption-based CO2 separation processes for power plants (12,560 m3 absorber column volume). As there are many options for waste heat utilization in the glass industry, the waste heat required for CO2 desorption can be generated in a particularly efficient and cost-effective way. The resulting CO2 separation costs range between 41 and 42 EUR/t CO2, depending on waste heat utilization for desorption. These costs are below the values of 50-65 EUR/t CO2 for comparable industrial applications. Despite these promising economic results, there are still some technical restrictions in terms of solvent degradation due to the high oxygen content in flue gas compositions. The results of this study point towards parametric studies for approaching these issues, such as the use of secondary and tertiary amines as solvents, or the optimization of operating conditions such as stripper pressure for further cost reductions potential.}, language = {en} } @article{GradNadammalTytkoetal., author = {Grad, Marius and Nadammal, Naresh and Tytko, Darius and Noster, Ulf}, title = {On the nanoindentation behavior of a TiC layer formed through thermo-reactive diffusion during hot pressing of Ti and cast iron}, series = {Materials Letters: X}, volume = {15}, journal = {Materials Letters: X}, number = {September}, publisher = {Elsevier}, address = {Amsterdam, Niederlande}, issn = {2590-1508}, doi = {10.1016/j.mlblux.2022.100161}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-50066}, pages = {1 -- 4}, abstract = {Hot pressing of pure Ti and cast iron under vacuum formed a ~15 μm wide TiC-layer through the thermoreactive diffusion process. Nanoindentation testing of the TiC-layer revealed average hardness and elastic modulus values of ~35 GPa and ~400 GPa, respectively. High-resolution indentation mapping indicated hardness change across the boundary with peak values observed within the TiC-layer. Solid state high temperature diffusion holds significant potential for developing uniform hard coatings on pure Ti/Ti-alloys.}, language = {en} } @article{ZacherlWopperSchwanzeretal., author = {Zacherl, Florian and Wopper, Christoph and Schwanzer, Peter and Rabl, Hans-Peter}, title = {Potential of the Synthetic Fuel Oxymethylene Ether (OME) for the Usage in a Single-Cylinder Non-Road Diesel Engine: Thermodynamics and Emissions}, series = {Energies}, volume = {15}, journal = {Energies}, number = {21}, publisher = {MDPI}, doi = {10.3390/en15217932}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-55350}, pages = {1 -- 26}, abstract = {Non-road sectors, such as agriculture and construction machinery, require high energy densities and flexibility in use, which is why diesel engines are mainly used. The use of climate-neutral fuels, produced from renewable energies, such as Oxymethylene Ether (OME) as a diesel substitute, can significantly reduce CO2 and pollutant emissions in these sectors. In addition to CO2 neutrality, OME also offers improved combustion characteristics compared to diesel fuel, eliminating the soot-NOx trade-off and thus enabling new opportunities in engine design and calibration. In this paper, the combustion of pure OME on a close-to-production, single-cylinder non-road diesel engine with a pump-line-nozzle injection system is analyzed. A variation of the center of combustion at constant power output was performed for diesel and OME at different operating points. Two injectors were investigated with OME. A study on ignition delay and a detailed thermodynamic analysis was carried out. In addition, the exhaust emissions CO, NOx, VOC, as well as particulate-matter, -number and -size distributions were measured. With OME, a significantly shorter ignition delay as well as a shortened combustion duration could be observed, despite a longer injection duration. In addition, the maximum injection pressure increases. VOC and CO emissions are reduced. Particulate matter was reduced by more than 99\% and particle number (>10 nm) was reduced by multiple orders of magnitude. The median of the particle size distribution shifts from 60 to 85 nm (diesel) into a diameter range of sub 23 nm (OME). A significant reduction of NOx emissions with OME enables new degrees of freedom in engine calibration and an efficiency advantage without hardware adaption.}, language = {en} } @article{TroidlSchrollDecker, author = {Troidl, Kilian and Schroll-Decker, Irmgard}, title = {Wie theoriebasiert sind Forschungsbeitr{\"a}ge zur Bildungsbeteiligung? Eine Qualitative Inhaltsanalyse ausgew{\"a}hlter Fachzeitschriften der Erwachsenen- und Weiterbildungsforschung}, series = {Zeitschrift f{\"u}r Weiterbildungsforschung}, volume = {45}, journal = {Zeitschrift f{\"u}r Weiterbildungsforschung}, publisher = {Springer Nature}, doi = {10.1007/s40955-022-00229-3}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-55460}, pages = {19}, abstract = {In der Vergangenheit wurde beklagt, dass in der empirischen Forschung zur Bildungsbeteiligung Erwachsener selten eine Integration von Theorie und Empirie erfolge und die mangelnde empirische Pr{\"u}fung eine theoretische Weiterentwicklung des Forschungsfeldes erschwere. Mittels einer Qualitativen Inhaltsanalyse von Beitr{\"a}gen ausgew{\"a}hlter Fachzeitschriften der Erwachsenen‑/Weiterbildungsforschung wurde versucht, die Aktualit{\"a}t dieser Feststellung empirisch zu {\"u}berpr{\"u}fen. Dazu wurden 38 empirische Forschungsbeitr{\"a}ge zur Bildungsbeteiligung der Jahrg{\"a}nge 2018 bis 2020 von neun Fachzeitschriften mit Peer-Review untersucht. Die Einsch{\"a}tzung der Beitr{\"a}ge erfolgte hinsichtlich des Grades der Theorieeinbindung. Die Ergebnisse der Analyse zeigen ein gemischtes Bild: neun Beitr{\"a}ge (24 \%) binden keine Theorie in den Forschungsprozess ein, ein Beitrag (3 \%) zitiert Theorie lediglich, ohne sie weiter einzubinden. Am h{\"a}ufigsten ist eine Einbindung zum theoriegeleiteten Vorgehen (16 Beitr{\"a}ge, 42 \%). Eine tiefergehende Theorieanwendung findet sich in sechs Beitr{\"a}gen (16 \%). Eine theoriepr{\"u}fende oder -bildende Einbindung liegt mit je drei Beitr{\"a}gen (je 8 \%) seltener vor. Die rezipierten Theorien sind vielf{\"a}ltig: es werden 20 verschiedene Theorieans{\"a}tze festgestellt. Den Forderungen nach einer verst{\"a}rkten Einbindung von Theorie in den Forschungsprozess kann somit weiterhin G{\"u}ltigkeit attestiert werden: ein substanzieller Teil der Beitr{\"a}ge berichtet keine Theorieeinbindung, eine empirische Pr{\"u}fung oder Weiterentwicklung findet relativ selten statt.}, subject = {Erwachsenenbildung}, language = {de} } @article{HaugSchnellScharfetal., author = {Haug, Sonja and Schnell, Rainer and Scharf, Anna and Altenbuchner, Amelie and Weber, Karsten}, title = {Bereitschaft zur Impfung mit einem COVID-19-Vakzin - Risikoeinsch{\"a}tzung, Impferfahrungen und Einstellung zu Behandlungsverfahren}, series = {Pr{\"a}vention und Gesundheitsf{\"o}rderung}, volume = {17}, journal = {Pr{\"a}vention und Gesundheitsf{\"o}rderung}, number = {4}, publisher = {Springer Nature}, doi = {10.1007/s11553-021-00908-y}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-154}, pages = {537 -- 544}, abstract = {Hintergrund Impfungen stellen eine bedeutende Pr{\"a}ventionsmaßnahme dar. Grundlegend f{\"u}r die Eind{\"a}mmung der Coronapandemie mittels Durchimpfung der Gesellschaft ist eine ausgepr{\"a}gte Impfbereitschaft. Ziel der Arbeit Die Impfbereitschaft mit einem COVID‑19-Vakzin (Impfstoff gegen das Coronavirus) und deren Einflussfaktoren werden anhand einer Zufallsstichprobe der Gesamtbev{\"o}lkerung in Deutschland untersucht. Material und Methoden Die Studie basiert auf einer telefonischen Zufallsstichprobe und ber{\"u}cksichtigt {\"a}ltere und vorerkrankte Personen ihrem Bev{\"o}lkerungsanteil entsprechend. Die Ein-Themen-Bev{\"o}lkerungsbefragung zur Impfbereitschaft (n = 2014) wurde im November/Dezember 2020 durchgef{\"u}hrt. Ergebnisse Die Impfbereitschaft in der Stichprobe liegt bei rund 67 \%. Vorerfahrungen mit Impfungen moderieren die Impfbereitschaft. Sie steigt bei Zugeh{\"o}rigkeit zu einer Risikogruppe. Der Glaube an die Wirksamkeit alternativer Heilmethoden und Bef{\"u}rwortung alternativer Behandlungsverfahren geht mit geringerer Impfbereitschaft einher. {\"A}ltere Menschen sind impfbereiter, kovariierend mit ihrer Einsch{\"a}tzung h{\"o}herer Gef{\"a}hrdung bei Erkrankung. Ebenso ist die Ablehnung einer Impfung mit der {\"U}bersch{\"a}tzung von Nebenwirkungen assoziiert. Schlussfolgerung Die Impfbereitschaft h{\"a}ngt mit Impferfahrungen und Einstellungen zu Gesundheitsbehandlungsverfahren allgemein zusammen. Die {\"U}bersch{\"a}tzung der H{\"a}ufigkeit ernsthafter Nebenwirkungen bei Impfungen weist auf weit verbreitete Fehlinformationen hin.}, language = {de} } @article{AltenbuchnerHaugSchnelletal., author = {Altenbuchner, Amelie and Haug, Sonja and Schnell, Rainer and Scharf, Anna and Weber, Karsten}, title = {Impfbereitschaft von Eltern mit einem COVID-19-Vakzin}, series = {P{\"a}diatrie \& P{\"a}dologie. {\"O}sterreichische Zeitschrift f{\"u}r Kinder- \& Jugendheilkunde}, volume = {56}, journal = {P{\"a}diatrie \& P{\"a}dologie. {\"O}sterreichische Zeitschrift f{\"u}r Kinder- \& Jugendheilkunde}, number = {5}, publisher = {Springer Nature}, doi = {10.1007/s00608-021-00925-2}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-196}, pages = {230 -- 234}, abstract = {Hintergrund: Eltern stehen im Rahmen der eigenen Impfung und der Kinderimpfung mit einem COVID-19-Vakzin vor einer Impfentscheidung. Zum aktuellen Zeitpunkt gibt es keine (vollst{\"a}ndige) Impfempfehlung. Fragestellung: Die Studie untersucht die Impfbereitschaft von Eltern minderj{\"a}hriger Kinder und Personen ohne minderj{\"a}hrige Kinder, wobei insbesondere Geschlechtsunterschiede {\"u}berpr{\"u}ft werden. Methoden: Die Studie basiert auf einer Zufallsstichprobe (Telefon-Survey, n = 2014, Erhebung zwischen 12.11.2020 und 10.12.2020). Die Auswertung st{\"u}tzt sich insbesondere auf die Teilstichprobe von Personen mit minderj{\"a}hrigen Kindern im Haushalt (n = 461). Ergebnisse: Eltern weisen durchg{\"a}ngig eine geringere Impfbereitschaft mit einem COVID-19-Vakzin auf als Befragte ohne minderj{\"a}hrige Kinder (54,1 \% vs. 71,1 \%). V{\"a}ter weisen eine st{\"a}rker ausgepr{\"a}gte eigene Impfbereitschaft auf als M{\"u}tter. Dar{\"u}ber hinaus sind M{\"a}nner eher als Frauen bereit, das eigene Kind mit einem COVID-19-Vakzin impfen zu lassen. Schlussfolgerungen: Bei Eltern und insbesondere M{\"u}ttern ist eine erhebliche Fehleinsch{\"a}tzung von Impfrisiken und h{\"a}ufiger Glaube an Impfverschw{\"o}rungstheorien zu beobachten. Empfohlen werden anschauliche und leicht verst{\"a}ndliche Informationen {\"u}ber die Wirkung und Nebenwirkungen der Impfung mit einem COVID-19-Vakzin durch zust{\"a}ndige Institutionen und {\"A}rzte.}, language = {de} } @article{AltenbuchnerHaugWeber, author = {Altenbuchner, Amelie and Haug, Sonja and Weber, Karsten}, title = {Die ersten Schritte nach einer h{\"u}ftnahen Fraktur}, series = {Zeitschrift f{\"u}r Gerontologie und Geriatrie}, volume = {54}, journal = {Zeitschrift f{\"u}r Gerontologie und Geriatrie}, publisher = {Springer Nature}, issn = {0948-6704}, doi = {10.1007/s00391-021-01861-3}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-14251}, pages = {555 -- 560}, abstract = {Nach einer Fraktur ist Mobilisierung Behandlungsziel und Therapies{\"a}ule. Das Festlegen von Outcomes basiert jedoch auf vielen Unsicherheiten, da Assessments nicht f{\"u}r alle Patient/-innen geeignet sind. Sie k{\"o}nnen agesabh{\"a}ngig beeinflusst und subjektiv gepr{\"a}gt sein. Sensorbasiertes Bewegungsmonitoring bietet eine Erg{\"a}nzung zur Operationalisierung der Gehf{\"a}higkeit. F{\"u}r L{\"a}ngsschnittuntersuchungen, die auch im h{\"a}uslichen Umfeld durchgef{\"u}hrt werden, eignet sich die t{\"a}gliche Schrittzahl als Variable. Sie kann durch einen handels{\"u}blichen Fitnesstracker beobachtet werden.}, language = {de} } @article{SchoenbergerScherzingerMauerer, author = {Sch{\"o}nberger, Manuel and Scherzinger, Stefanie and Mauerer, Wolfgang}, title = {Ready to Leap (by Co-Design)? Join Order Optimisation on Quantum Hardware}, series = {Proceedings of the ACM on Management of Data, PACMMOD}, volume = {1}, journal = {Proceedings of the ACM on Management of Data, PACMMOD}, number = {1}, publisher = {ACM}, address = {New York, NY,}, doi = {10.1145/3588946}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-56634}, pages = {1 -- 27}, abstract = {The prospect of achieving computational speedups by exploiting quantum phenomena makes the use of quantum processing units (QPUs) attractive for many algorithmic database problems. Query optimisation, which concerns problems that typically need to explore large search spaces, seems like an ideal match for the known quantum algorithms. We present the first quantum implementation of join ordering, which is one of the most investigated and fundamental query optimisation problems, based on a reformulation to quadratic binary unconstrained optimisation problems. We empirically characterise our method on two state-of-the-art approaches (gate-based quantum computing and quantum annealing), and identify speed-ups compared to the best know classical join ordering approaches for input sizes that can be processed with current quantum annealers. However, we also confirm that limits of early-stage technology are quickly reached. Current QPUs are classified as noisy, intermediate scale quantum computers (NISQ), and are restricted by a variety of limitations that reduce their capabilities as compared to ideal future quantum computers, which prevents us from scaling up problem dimensions and reaching practical utility. To overcome these challenges, our formulation accounts for specific QPU properties and limitations, and allows us to trade between achievable solution quality and possible problem size. In contrast to all prior work on quantum computing for query optimisation and database-related challenges, we go beyond currently available QPUs, and explicitly target the scalability limitations: Using insights gained from numerical simulations and our experimental analysis, we identify key criteria for co-designing QPUs to improve their usefulness for join ordering, and show how even relatively minor physical architectural improvements can result in substantial enhancements. Finally, we outline a path towards practical utility of custom-designed QPUs.}, language = {en} } @article{ThielKratzerGrimmetal., author = {Thiel, Charlotte and Kratzer, Johanna and Grimm, Benedikt and Kr{\"a}nkel, Thomas and Gehlen, Christoph}, title = {Effect of Internal Moisture and Outer Relative Humidity on Concrete Carbonation}, series = {CivilEng}, volume = {4}, journal = {CivilEng}, number = {3}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/civileng3040058}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-56091}, pages = {1039 -- 1052}, abstract = {With steadily rising CO2 concentrations in the ambient air and fast-changing concretecompositions with reduced clinker contents, the availability of reliable and accelerated concrete car-bonation tests is of crucial importance to design durable structures. This paper focuses on the effectsof moisture under accelerated conditions and the effects of different CO2 exposure conditions. Mor-tar prisms incorporating three different cement types were cured and stored at either 50\% or 65\%relative humidity (RH). Afterwards, the prisms were carbonated at different ambient humidities(50, 57 and 65\%), different CO2 concentrations (0.04, 1 and 3 vol.\%) and complemented by a seriesof tests at increased gas pressure (2 barg). High-resolution test methods were used to explain theunderlying carbonation mechanisms. The results show that pre-conditioning for two weeks—ascurrently suggested by the European Standard—seems to be too short because the initial inner mois-ture content severely affects the carbonation rate. Relative humidity during carbonation of 57\% ledto higher carbonation rates compared to 50\% and 65\%. In addition, climate data needs to be period-ically (preferably permanently) recorded in research experiments and in laboratory testing to ensurefair interpretation of experimental results.}, language = {en} }