TY - CHAP A1 - Probst, Anne-Catherine A1 - Hitzinger, Hans A1 - Bochtler, Ulrich A1 - Wölfel, Maximilian A1 - Schmitt, Christoph ED - U.R.S.I. Landesausschuss in Deutschland e.V. 2021, T1 - High Frequency Power Amplifier for Wideband Wireless Communication Systems T2 - Proceedings of the 2021 Kleinheubach Conference N2 - Increasing data transmission rates and bandwidth both belong to the challenges of the development of high-performance wireless communication systems. Multi-channel communication systems commonly use several narrowband power amplifiers each one for a single communication channel. Lossy couplers are needed both to separate the different channels from each other at the amplifiers input and to combine the amplified signals on each channel at the output. This approach depicts a poor efficiency and is limited to a few number of channels since each channel duplication involves 3 dB losses due to couplers. Alternatively, broadband radio frequency power amplifiers ensuring the simultaneous transmission of several carriers on a wide frequency range contribute to increase the cost and resource efficiency of transceivers in wireless communication systems. Gain flatness, a high output power, and low power levels of second and third order harmonics are required on the whole operating frequency range of the power amplifier in multi-carrier communication systems since overtones will degrade the quality of the communication. The present work investigates the performances of a broadband push-pull power amplifier based on LDMOS transistors, the input matching network using a 8:1 transmission line transformer. For the first time investigations on harmonic distortions of the amplified signal when using a transformer with 8:1 impedance transformation ratio are presented. Characterisation of the power amplifiers performances is focused on gain flatness, output power, harmonic distortions and efficiency at 110 W. KW - LDMOS KW - broadband RF power amplifier KW - push-pull KW - transmission line transformer KW - harmonic distortion KW - Hochfrequenzverstärker KW - Leistungsverstärker KW - Kommunikationssystem Y1 - 2021 U6 - https://doi.org/10.23919/IEEECONF54431.2021.9598443 VL - 2021 ER - TY - JOUR A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Chaoticity Versus Stochasticity in Financial Markets: Are Daily S&P 500 Return Dynamics Chaotic? JF - Communications in Nonlinear Science and Numerical Simulation N2 - In this study, we empirically show the dynamics of daily wavelet-filtered (denoised) S&P 500 returns (2000–2020) to consist of an almost equally divided combination of stochastic and deterministic chaos, rendering the series unpredictable after expiration of the Lyapunov time, resulting in futile forecasting attempts. We achieve a clear distinction of the true nature of the underlying time series dynamics by applying a novel and combinatory chaos analysis framework comparing the wavelet-filtered S&P 500 returns with respective surrogate datasets, Brownian motion returns and a Lorenz system realisation. Furthermore, we are the first to show the strange attractor of especially the daily-frequented S&P 500 return system graphically via Takens´ embedding and by spectral embedding in combination with Laplacian Eigenmaps. Finally, we critically discuss implications and future prospects in terms of financial forecasting. KW - nonlinear dynamics KW - chaos KW - recurrence analysis KW - finance KW - prediction KW - Aktienrendite KW - Kreditmarkt Y1 - 2022 VL - 2022 IS - Forthcoming SP - 1 EP - 51 ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - Enterprise Social Media and Control System Design T2 - Proceedings of 19th ACMAR - Annual Conference for Management Accounting Research N2 - Enterprise social media has been found to be a curse and a blessing at the same time. ESM has been reported to lead to unproductive ‘games of visibility’ and ‘exhibitionism’, while it has been also found to enable productive outcomes related to knowledge work and product innovation, the latter being the main reason for its wide-spread adoption. We argue that decisions to use ESM as a control instrument are not made in isolation, but as part of a set of complementary choices. We provide arguments and empirical evidence that the use of ESM as a control instrument in organizations complements the use of subjective evaluations of non-task related performance (SPE). We also show that firms that face high ESM employee concerns, have a stronger complementarity between ESM use and SPE. Additional analyses show that ESM use and performance-based pay (PBP) are also complements. Together the results imply that management control system configuration changes with the employment of ESM. KW - Mangement Control Systems KW - Controlling KW - Social Media KW - Mixed-Method Approach KW - Behavioral Accounting KW - Social Media KW - Unternehmen Y1 - 2022 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Rödling, Claudius A1 - Kimmel, Kevin A1 - Zeising, Sebastian A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Verma, Shruti A1 - Rees, Paul T1 - Optical characterization of reflective coatings for astronomical telescope mirrors T2 - DGaO Proceedings N2 - Aluminium evaporation is still the standard solution for reflective coatings of large astronomical mirrors. Silver and gold are also used in specific cases depending on the targeted wavelength. This study characterized different metallic coatings - including unusual ones like sputtered iridium - to identify the most suitable mirror coating for the spectral range from ultraviolet to infrared wavelengths. KW - Iridium KW - mirror KW - coating KW - reflectivity KW - telescope KW - Spiegelteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p4.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 1 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Cotroneo, Vincenzo A1 - Pareschi, Giovanni A1 - Gibertini, Eugenio A1 - Magagnin, Luca T1 - Low-density coatings for enhanced X-ray reflectivity of astronomical telescope mirrors T2 - DGaO Proceedings N2 - High reflectivity grazing incidence mirrors of astronomical X-ray telescopes are usually coated with thin layers of iridium, gold, or platinum. Due to a series of absorption edges, these noble metals have low reflectivity in the 2 - 4 keV band. We present the development of innovative material combinations using chromium and an additional layer of polydopamine for enhanced reflectivity X-ray coatings. KW - Dopamin KW - Iridium KW - mirror KW - coating KW - X-ray KW - Röntgenteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p3.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Rukdee, Surangkhana A1 - Friedrich, Peter A1 - Sahin, Fatih A1 - Hudec, Rene T1 - Charakterisierung von Weitwinkel-Röntgenteleskopen in der Testanlage PANTER T2 - DGaO Proceedings N2 - Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei Röntgenteleskope, bestückt mit Gold- und Iridium-beschichteten Planspiegeln. Deren Charakterisierung erfolgte an der Röntgentestanlage PANTER, welche parallel auf die Teleskope einfallendes Sternenlicht simuliert. Die Teleskope haben eine Winkelauflösung von ca. 4 Bogenminuten und eine Brennweite von rund 2 Metern. KW - Röntgenstrahlung KW - Teleskop KW - Iridium KW - Beschichtung KW - Astronomie KW - Röntgenteleskop KW - Iridium KW - Spiegelteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p2.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 2 PB - DGaO ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Zuwendungsnießbrauch an GmbH-Anteilen: Gestaltungschancen und Risiken JF - Erbfolgebesteuerung N2 - Der unentgeltliche Zuwendungsnießbrauch an GmbH-Beteiligungen ist eine häufig genutzte Gestaltung, die auf die Versorgung von Angehörigen im Rahmen der vorweggenommenen Erbfolge abzielt. Aus wirtschaftlicher Sicht soll mit der Bestellung Nicht-Gesellschaftern eine regelmäßige Einkunftsquelle verschafft werden; daneben gilt es, bei den Beteiligten ertragsteuerliche, erbschaft- und schenkungsteuerliche Privilegien zu nutzen. Konkret geht es und die Ausschöpfung von Progressionsvorteilen und Freibeträgen. Grundsätzlich bleibt aber festzuhalten, dass die Bestellung eines Zuwendungsnießbrauchs an GmbH-Anteilen nach wie vor mit erheblichen rechtlichen und steuerlichen Unsicherheiten behaftet ist. KW - GmbH-Anteile; Zuwendungsnießbrauch; vorweggenommene Erbfolge; Zivilrecht; Ertragsteuerrecht; Schenkungsteuerrecht; KW - Nießbrauch KW - GmbH KW - Vorweggenommene Erbfolge KW - Steuerrecht Y1 - 2021 VL - 2021 IS - 12 SP - 313 EP - 318 ER - TY - JOUR A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Grilli, Francesco A1 - Benkel, Tara A1 - Hänisch, Jens A1 - Lao, Mayraluna A1 - Reis, Thomas A1 - Berberich, Eva A1 - Wolfstädter, Simon A1 - Schneider, Christian A1 - Miller, Paul A1 - Palmer, Chloe A1 - Glowacki, Bartek A1 - Climente-Alarcon, Vicente A1 - Smara, Anis A1 - Tomkow, Lukasz A1 - Jeunesse, Loic A1 - Staempflin, Martin A1 - Delautre, Guillaume A1 - Zimmermann, Baptiste A1 - van der Woude, Ruud A1 - Perez, Ana A1 - Samoilenkov, Sergey A1 - Molodyk, Alexander A1 - Pardo, Enric A1 - Kapolka, Milan A1 - Li, Shuo A1 - Dadhich, Anang T1 - Superconducting motors for aircraft propulsion: the Advanced Superconducting Motor Experimental Demonstrator project JF - Journal of Physics: Conference Series N2 - The European Union-funded Advanced Superconducting Motor Experimental Demonstrator (ASuMED) project started in May 2017 with the purpose of demonstrating the benefits of a new, fully superconducting motor for reaching the targets established by the Flightpath 2050 plan. The project aims at a motor power density of 20 kW kg−1 using a high-temperature superconducting (HTS) stator. The rotor will use HTS stacks operating like permanent magnets. A highly efficient cryostat for the motor combined with an integrated cryogenic cooling system and associated power converter will be used. This article provides a general overview of the prototype that is currently being assembled and that will be tested soon. KW - Hochtemperatursupraleiter KW - Flugtriebwerk Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1742-6596/1590/1/012051 U6 - https://doi.org/10.1088/1742-6596/1590/1/012051 VL - 1590 ER - TY - GEN A1 - Jost, Thomas ED - Main-Echo, T1 - Die Gefahr ultraexpansiver Geldpolitik KW - Geldpolitik KW - Europäische Zentralbank Y1 - 2021 ER - TY - CHAP A1 - Freudenmann, Dominic A1 - Stollenwerk, Manfred A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Negri, Michele A1 - Lauck, Felix T1 - Combustion efficiency of iridium coated pellets for environmentally friendly space propulsion T2 - 14th Pico- and Nanosatellite Workshop, Würzburg, Germany N2 - Most of the satellite engines still uses critical fuels such as hydrazine, which is chemically aggressive, toxic and carcinogenic. New developments for satellite engines try to avoid such critical propellants. One promising approach is the usage of rocket-grade hydrogen peroxide [H2O2] in mono- and bipropellant driven rocket engines. Catalysts in the rocket engines convert the hydrogen peroxide by an exothermic catalytic reaction; the resulting hot gases oxygen and water vapor provide the thrust. Currently used catalysts are, for example, Al2O3 pellets impregnated with platinum. Within a joint research project of Aschaffenburg University and the German Aerospace Center new catalysts are developed. They consist of ceramic pellets coated with iridium using the magnetron sputtering process. Thereby the surface structure of the iridium layers strongly depends on the used sputtering process conditions [1]. After optimization of the sputtering parameters, it was demonstrated in laboratory experiments that the catalytic effect (measured by the volume of released gas) can be increased by a factor of four compared to platinum impregnated pellets [2]. In first hot firing tests at the test bench complex M11 at the DLR- Institute of Space Propulsion, these new, iridium-based catalysts have been used in a model combustion chamber for hydrogen peroxide decomposition. For this purpose, the reaction chamber was filled with iridium pellets in the high-altitude simulation chamber of the M11.2 test bench. The model chamber was equipped with numerous measuring devices like temperature and pressure sensors (e.g. Tcat, pcat). With the help of the mass flow and the herein obtained data, performance characteristics of the propellant system were accessible. High-concentrated hydrogen peroxide was used in the experiments as monopropellant (~ 87-wt.% H2O2). During the experiments, the combustion chamber was operated in pulse mode and in continuous mode. Aim of this campaign called MoCa (“Monopropellant Catalytic Demonstrator”) is the demonstration of functionality and the performance evaluation of this iridium-based monopropellant system. Recent experimental results will be presented. References: [1] A. Büttner et al., Thin Solid Films 2018, 662: 41–46 [2] M. Stollenwerk et al., Journal of Materials Science 2021, 56(16), 9974-9984 KW - Satellitentechnik KW - Katalysator KW - Iridium Y1 - 2021 ER - TY - GEN A1 - Hudec, Rene A1 - Novakova, Hana A1 - Pritzl, Vaclav A1 - Vojnar, Jan A1 - Döhring, Thorsten T1 - CubeSat mission for the observation of meteoroid impacts on Moon T2 - DGaO Jahrestagung N2 - Recent progress in nanosatellite technologies allows to consider innovative new CubeSat missions for scientific purposes. We present and evaluate the design of a small and cost effective CubeSat mission to monitor lunar meteoroid impacts by detecting their optical flashes. The poster summarizes the results of a comprehensive survey of past and recent ground based and satellite based projects focussing on lunar impact monitoring and discusses important aspects of the proposed mission and various alternatives for their solutions. Several spacecraft orbits around Moon and their usefulness for lunar impact observation are studied. In addition, we discuss the environmental risks and challenges, which such spacecraft needs to face, mainly thermal management and radiation tolerance. Finally, we present and discuss the design an optical camera suitable to detect meteoroid impacts on the lunar surface. N2 - Poster KW - CubeSat KW - satellite KW - Moon KW - meteroid KW - impact KW - Impakt KW - Mond KW - Satellit Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Rödling, Claudius A1 - Kimmel, Kevin A1 - Zeising, Sebastian A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Verma, Shruti A1 - Rees, Paul T1 - Optical characterization of reflective coatings for astronomical telescope mirrors T2 - DGaO Jahrestagung N2 - With ground based optical telescopes astronomers observe celestial objects over a wide spectral range. As usually three or even more reflections at telescope mirrors are involved, good reflection properties of the mirror coatings are important. The aluminum evaporation technique has been - and is still - the standard solution for the reflective coatings of large astronomical mirrors. Such coatings have excellent reflectivity in the ultraviolet and in the visible, but perform poorly in the infrared. Silver is the metal having highest reflectivity for wavelengths longward of 400 nm, but isn´t the best choice for reflectivity in the ultraviolet and for blue light. To avoid degradation by oxidation, durable silver coatings need to be protected by transmitting overcoating layers. In the presented study, different metallic coatings – including unusual ones like sputtered iridium - are characterized to identify a coating that is most suitable for the spectral range from ultraviolet to infrared. Experimental results are compared to simulations based on the complex refractive indices of these materials. Thereby dependence of incidence angle and polarization is also considered. N2 - Poster KW - mirror KW - coating KW - iridium KW - astronomy KW - telescope KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Rukdee, Surangkhana A1 - Friedrich, Peter A1 - Sahin, Fatih A1 - HUdec, Rene T1 - Charakterisierung von Weitwinkel-Röntgenteleskopen in der Testanlage PANTER T2 - DGaO Jahrestagung N2 - Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei mechanisch baugleiche Röntgenteleskope, bestückt mit Gold- und Iridium-beschichteten Planspiegeln. Die Charakterisierung der nach dem ägyptischen Gott HORUS benannten Teleskope erfolgte an der Röntgentestanlage PANTER des Max-Plack-Instituts für extraterrestrische Physik. Diese Vakuum-Testanlage simuliert parallel auf die Teleskope einfallendes Sternenlicht, wobei hier die Strahlung aus einer Röntgenquelle in 120 Metern Abstand stammt. Die Messungen selbst fanden in einer daran angebauten 12 Meter langen Testkammer von 3,5 Metern Durchmesser statt. Im März 2021 sahen die HORUS-Teleskope zum erstem Mal Röntgenlicht. Während der Testkampagne von ca. 54 Stunden Dauer wurden 536 Einzelmessungen an den beiden Teleskopen durchgeführt, bei denen Photonenenergien und Einfallswinkel variiert wurden. Von einer empfindlichen CCD-Kamera, einem Prototyp der eROSITA-Satellitenkamera, wurden hierbei insgesamt 11.153.574 Röntgenphotonen individuell detektiert, analysiert und digital verarbeitet. Die beiden Weitwinkel-Röntgenteleskope haben eine Winkelauflösung von circa 4 Bogenminuten und eine Brennweite von rund zwei Metern. N2 - Poster KW - Röntgenstrahlung KW - Spiegel KW - Teleskop KW - Satellit KW - Iridium KW - Röntgenstrahlung KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Cotroneo, Vincenzo A1 - Pareschi, Giovanni A1 - Gibertini, Eugenio A1 - Magagnin, Luca T1 - Low-density coatings for enhanced X-ray reflectivity of astronomical telescope mirrors T2 - DGaO Jahrestagung N2 - X-ray telescopes usually operate in space and are quite different from astronomical telescopes for visible light. For normal angles of incidence, optical light is reflected on the mirror surface, whereas X-rays are either transmitted or absorbed. However, also high reflectivity X-rays mirrors are possible, when the incident rays direction is almost parallel to the mirror surface. Such grazing incidence mirrors are usually coated with thin layers of precious metals like iridium, gold or platinum, as this result in high X-ray reflectivity. These noble metals offer a wide range of reflection up to high photon energies, but, due to a series of absorption edges, have low reflectivity in the 2 - 4 keV band and below. This contribution presents the development of innovative material combinations based on thin layers of iridium and chromium, followed by an additional layer of carbon-based materials. We also discuss corresponding production methods (like dip coating) for enhanced reflectivity mirror coatings of future X-ray telescopes. N2 - Poster KW - X-ray KW - mirror KW - coating KW - iridium KW - satellite KW - Röntgenstrahlung KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Current results on laser-based production of complex optics in glass T2 - 10. Wetzlarer Herbsttagung "Moderne Optikfertigung", 29. - 30. September 2020, Wetzlar KW - Laserbearbeitung KW - Fertigungstechnik Y1 - 2020 ER - TY - GEN A1 - Schwarz, Simon A1 - Hellmann, Ralf T1 - Rapid laser fabrication of complex glass optics T2 - International Research Days N2 - Poster KW - Laserbearbeitung Y1 - 2021 ER - TY - JOUR A1 - Zettl, Julian A1 - Klar, Maximilian A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Laser turning with ultrashort laser pulses JF - Journal of Manufacturing Processes N2 - We report on a comprehensive micromachining study of rotationally symmetric parts using femtosecond laser. A laser turning process with tangential impingement of the laser radiation complemented by a trepanning optics is implemented as to accomplish a true laser lathe micromachining approach. With the objective of optimized ablation rate and reduced surface roughness, the influence of pulse energy, feed rate, trepanning diameter and angular beam incidence, respectively, is investigated for processing stellite rods. We find the smallest feasible feature sizes of 8.5 μm in diameter and smoothest surfaces with an arithmetic average of the roughness profile as low as 0.18 μm. The surface roughness, however, appears to be limited by the occurrence of laser induced periodic surface structures provoked by the femtosecond laser radiation. Furthermore, the variation of the fluence in accordance to the incidence on a curved surface is discussed and the heat input into the material is examined through a longitudinal cross section. KW - Ultrashort laser pulses KW - Turning KW - Ablation rate KW - Tangential processing KW - Trepanning optic KW - Ultrakurzer Lichtimpuls KW - Laserbearbeitung KW - Mikrobearbeitung KW - Femtosekundenlaser Y1 - 2021 U6 - https://doi.org/10.1016/j.jmapro.2021.06.025 VL - 2021 IS - 68 SP - 1562 EP - 1568 ER - TY - JOUR A1 - Zettl, Julian A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Tangential Laser Turning of Fused Silica Using Ultra-short Laser Pulses JF - Journal of Laser Micro/Nanoengineering N2 - Laser turning with ultra-short laser pulses provides the possibility of manufacturing rotationally symmetric geometries, even of hard to machine materials as fused silica, down to a micrometer scale. In this laser micro machining approach, the laser beam is oriented perpendicularly to the rotational axis and tangentially to the material, whereas the target geometry is realized by moving the constantly rotating specimen according to the specified geometry under the focused laser spot. Due to the fric-tion-less laser ablation it is possible to realize a turning process in fused silica without the use of a contacting tool and therefore without causing mechanical tensions in the work piece. The processing head focuses the laser to a calculated spot size of 18 μm in diameter and the applied processing gas pressure assists in removing the ablated material. In this study, femto-second laser turning of fused silica with a diameter of 3.7 mm is investigated. The influence of the applied pulse energy is stated and the use of a trepanning optic during the turning process is characterized. Furthermore, compre-hensive parameter studies in order to optimize roughness and to find the maximum achievable abla-tion rate are shown. Limited by the mechanical speed of the rotational axis, the highest feasible abla-tion rate is 19.5 mm³/min. A roughness of Ra 0.65 μm are demonstrated. KW - Ultra-short Laser Pulses KW - Laser Turning KW - Fused Silica KW - Ablation Rate KW - Process Efficiency KW - Laserbearbeitung KW - Mikrobearbeitung KW - Quarzglas KW - Ultrakurzer Lichtimpuls Y1 - 2021 U6 - https://doi.org/10.2961/jlmn.2021.01.2008 VL - 16 IS - 1 SP - 42 EP - 46 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Schleier, Max A1 - Hellmann, Ralf T1 - Laser Cut Interruption Detection from Small Images by Using Convolutional Neural Network JF - Sensors KW - laser cutting KW - remote sensing KW - convolutional neural network KW - cut interruption KW - image processing KW - Laserschneiden KW - Neuronales Netz Y1 - 2021 UR - https://doi.org/10.3390/s21020655 U6 - https://doi.org/10.3390/s21020655 VL - 2021 IS - 21(2) SP - 655 EP - 655 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Simultaneous Burr and Cut Interruption Detection during Laser Cutting with Neural Networks JF - Sensors KW - laser cutting KW - quality monitoring KW - artificial neural network KW - burr formation KW - cut interruption KW - Laserschneiden KW - Neuronales Netz Y1 - 2021 UR - https://doi.org/10.3390/s21175831 U6 - https://doi.org/10.3390/s21175831 VL - 2021 IS - 21 SP - 5831 EP - 5831 ER - TY - JOUR A1 - Schleier, Max A1 - Adelmann, Benedikt A1 - Esen, Cemal A1 - Glatzel, Uwe A1 - Hellmann, Ralf T1 - Development and evaluation of an image processing algorithm for monitoring fiber laser fusion cutting by a high-speed camera JF - Journal of Laser Applications KW - Laser cutting KW - Image processing KW - Optical imaging KW - Image sensors KW - Laser applications KW - Faserlaser KW - Laserschneiden KW - Bildverarbeitung Y1 - 2021 UR - https://doi.org/10.2351/7.0000391 U6 - https://doi.org/10.2351/7.0000391 VL - 2021 IS - 33 SP - 032004 EP - 032004 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - UKP-Prozess mit anschließendem CO2-Laserpolieren zur Fertigung komplexer Optiken T2 - 10. Workshop Laserbearbeitung von Glaswerkstoffen KW - Linse KW - Array KW - Laserbearbeitung KW - Ultrakurzzeitlaser KW - Kohlendioxidlaser Y1 - 2020 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Ultrashort pulsed laser backside ablation of fused silica JF - Optics Express KW - Femtosekundenlaser KW - Quarzglas KW - Mikrobearbeitung Y1 - 2021 VL - 29 IS - 15 SP - 23477 EP - 23486 ER - TY - JOUR A1 - Schwarz, Simon A1 - Götzendorfer, Babette A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Compact Beam Homogenizer Module with Laser-Fabricated Lens-Arrays JF - applied sciences KW - Femtosekundenlaser KW - Linse KW - Array Y1 - 2021 VL - 2021 IS - 11 SP - 1018 EP - 1018 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Enhanced ablation efficiency using GHz bursts in micromachining fused silica JF - Optics Letters KW - Fräsen KW - Mikrobearbeitung KW - Quarzglas KW - Femtosekundenlaser Y1 - 2021 VL - 46 IS - 2 SP - 282 EP - 285 ER - TY - JOUR A1 - Götzendorfer, Babette A1 - Kirchgässner, Hannah A1 - Hellmann, Ralf T1 - Tunable, Anisotropic Permeability and Spatial Flow of SLM Manufactured Structures JF - Materials KW - Permeabilität KW - Selektives Laserschmelzen Y1 - 2021 U6 - https://doi.org/doi.org/10.3390/ma14185205 VL - 2021 IS - 14 SP - 5205 EP - 5220 ER - TY - JOUR A1 - Götzendorfer, Babette A1 - Mohr, Thomas A1 - Hellmann, Ralf T1 - Hybrid Approaches for Selective Laser Sintering by Building on Dissimilar Materials JF - Materials KW - Laserstrahlsintern Y1 - 2020 U6 - https://doi.org/doi.org/10.3390/ma13225285 VL - 2020 IS - 13 (22) SP - 5285 EP - 5296 ER - TY - JOUR A1 - Büdel, Johannes A1 - Teigelkötter, Johannes ED - Schäfer, Heinz T1 - Doppelzweipunktwechselrichter für Elektrofahrzeuge - Systemeigenschaften und Steuerung JF - Elektrische Antriebstechnologie für Hybrid- und Elektrofahrzeuge N2 - Im vorliegenden Beitrag wird die Topologie des Doppelzweipunktwechselrichters für die Anwendung in Elektrofahrzeugen vorgestellt. Dazu werden zunächst der Schaltungsaufbau und die spezifischen Schaltungseigenschaften näher erläutert. Anschließend werden relevante Vorteile dieser Topologie für die Anwendung in Elektrofahrzeugen dargestellt. Für die Kombination unterschiedlicher Energiequellen mit Hilfe des Doppelzweipunktwechselrichters werden geeignete Steuerungsstrategien präsentiert und anhand von realen Messungen am Systemprüfstand verifiziert. Mit dem Vorgestellten Verfahren kann die Leistungsaufteilung auf die beiden Energiespeicher und deren Energieaustausch untereinander mit hohem Freiheitsgrad gesteuert werden. KW - Elektrofahrzeug KW - Wechselrichter Y1 - 2019 VL - 2019 IS - 149 SP - 114 EP - 127 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kuhlmann, Kai A1 - Lang, Klaus A1 - Ott, Patrick T1 - Testing of High-Power Traction Batteries T2 - SMSI 2021 - System of Units and Metreological Infrastructure N2 - Electric drives in road vehicles with a battery as energy storage are about to be introduced to the mass market. In order to guarantee the quality and operational safety of battery-powered vehicles, considerable efforts must be made by car manufacturers and their suppliers. Since the properties of the batteries significantly determine the performance of the vehicles, special test benches with precise measuring systems are required for the accurate determination of the battery properties. The safety devices of the traction batteries must also be tested on high-performance test benches. In this paper the necessary test benches and the corresponding measuring systems are presented. Estimations of the measurement uncertainty and possibilities to increase measurement accuracy are presented. KW - Traktionsbatterie KW - Elektrofahrzeug Y1 - 2021 UR - https://www.ama-science.org/proceedings/details/4061 SN - 978-3-9819376-4-0 U6 - https://doi.org/10.5162/SMSI2021/C7. SP - 294 EP - 295 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Herkommer, Christian A1 - Kuhlmann, Kai T1 - High Dynamic Power Balancing for Dual Two-Level Inverters during High-Speed Machine Operation T2 - 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) N2 - This paper aims to present optimized square-wave modulation strategies for the dual two-level inverter, fed by two separate and galvanically isolated energy sources, to balance and control the energy distribution of both inverter systems. Especially for high-speed operation, the methods keep the machine in the required state while decreasing the switching operations to a minimum. Method one aims to compensate voltage fluctuations of variable DC-link voltages, while the second method ensures a symmetrical power distribution for the two inverter systems. In addition, both methods offer the possibility of adapting the amplitude of the usually fixed fundamental load voltage during square-wave modulation. KW - Wechselrichter Y1 - 2020 UR - https://ieeexplore.ieee.org/document/9215695 SN - 978-1-7281-9807-1 U6 - https://doi.org/10.23919/EPE20ECCEEurope43536.2020.9215695 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander T1 - Optimized Dual Two-Level Inverter for Safe and Reliable Operation of Machines with Superconductive Stator Windings T2 - 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) N2 - This paper aims to present an optimized inverter topology, based on the dual two-level inverter, for feeding an open-end winding electrical machine with superconductive stator windings and a superconductive rotor. In order to achieve a high torque density, the stator windings are built of several superconducting tapes being in parallel. One inverter of the dual two-level inverter is equipped with powerful IGBT semiconductors and supplies the machine with energy. The second inverter is a low voltage MOSFET inverter that monitors the superconductor resistance (quench detection) and balances the current on the parallel superconductive tapes for guaranteeing an optimum operation with respect to the superconductive losses. KW - Elektrische Maschine KW - Wechselrichter Y1 - 2019 UR - https://ieeexplore.ieee.org/document/8915524 SN - 978-1-7281-2361-5 U6 - https://doi.org/10.23919/EPE.2019.8915524 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Staudt, Stefan A1 - Büdel, Johannes T1 - Highly Dynamic Calculation of Power Quantities and Further Analysis of Inverter-Fed Machines T2 - 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) N2 - In this contribution, a highly dynamic calculation method of power quantities and additional electrical quantities, such as RMS values and fundamental waveforms, is presented. Typically, these quantities are calculated periodically based on the fundamental cycle of the electrical voltages and currents. Hence, they are well defined during steady state conditions for ideal periodical waveforms. During dynamic balancing processes, electrical signals are non-periodic. In a strict sense, the fundamental cycle-based definitions, which are well known from the literature, are not valid for these transient signals. However, this paper presents a novel definition for the calculation of cycle-based quantities based on the switching cycle of the inverter output voltages. This definition delivers instantaneous results during transient balancing processes, whereby it approximates the conventional fundamental cycle-based definitions during the steady state. KW - Elektrische Maschine KW - Umrichter Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8515600 SN - 978-1-5386-4145-3 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Büdel, Johannes T1 - Highly Dynamic Switching Frequency-Based Calculation of Power Quantities, Fundamental Waveforms, and RMS Values of Inverter-fed Electrical Machines T2 - 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) N2 - This contribution presents an innovative approximation method for the estimation of power quantities, fundamental waveforms, and RMS values of inverter-fed electrical machines. Typically, all these parameters are calculated as cyclically linked to the fundamental cycle of the voltages and currents of the inverter output or machine input. In order to increase the dynamic of this calculation, a suitable evaluation method based on the inverter switching cycle has been presented in previous publications. The present paper extends this switching frequency-based analysis by introducing additional quantities such as apparent and reactive power. Moreover, the paper describes the utilization of this analysis method for a power control of a dual two-level inverter-fed application. KW - Elektrische Maschine KW - Umrichter Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8507588 U6 - https://doi.org/10.23919/IPEC.2018.8507588 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Lang, Klaus T1 - Qualification and verification of high-power battery systems for traction application T2 - 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) N2 - This paper reveals that the standard test procedures for the qualification and verification of traction battery systems are not sufficient in certain cases. In fact, realistic and application-oriented tests on the interaction among the complex battery subsystems are inevitable. To achieve these objectives, a high-performance test bench with the unique selling features of a high voltage/- and current range, extremely low ripple currents, and high dynamics is presented. For the operation of the applied multiphase current-sharing inverter for charging/discharging the device under test (DUT), special control algorithms, especially a current balancing control method, is introduced. KW - Batteries KW - Traktionsbatterie Y1 - 2017 ER - TY - CHAP A1 - Staudt, Stefan A1 - Büdel, Johannes A1 - Kowalski, Thomas A1 - Lang, Klaus A1 - Teigelkötter, Johannes A1 - Stock, Alexander T1 - Optimized Modulation Schemes for the Efficiency Enhancement of Low Voltage Traction Drives T2 - 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) N2 - This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation schemes will be presented, as well as the transition between those schemes. Finally, the performance of the different schemes will be proved by dynamic and stationary tests through fully automatized measurement analysis. KW - Converter machine interactions KW - Electrical machine KW - Direct torque and flux control KW - Measurement KW - ulseWidth Modulation (PWM) KW - Elektrische Maschine KW - Niederspannung KW - Elektroantrieb Y1 - 2017 UR - https://ieeexplore.ieee.org/document/8098998 U6 - https://doi.org/10.23919/EPE17ECCEEurope.2017.8098998 ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Schreck, Steven A1 - Kress, Viktor A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Image Sequence Based Cyclist Action Recognition Using Multi-Stream 3D Convolution T2 - 2020 25th International Conference on Pattern Recognition (ICPR) N2 - In this article, we present an approach to detect basic movements of cyclists in real world traffic situations based on image sequences, optical flow (OF) sequences, and past positions using a multi-stream 3D convolutional neural network (3D-ConvNet) architecture. To resolve occlusions of cyclists by other traffic participants or road structures, we use a wide angle stereo camera system mounted at a heavily frequented public intersection. We created a large dataset consisting of 1,639 video sequences containing cyclists, recorded in real world traffic, resulting in over 1.1 million samples. Through modeling the cyclists' behavior by a state machine of basic cyclist movements, our approach takes every situation into account and is not limited to certain scenarios. We compare our method to an approach solely based on position sequences. Both methods are evaluated taking into account frame wise and scene wise classification results of basic movements, and detection times of basic movement transitions, where our approach outperforms the position based approach by producing more reliable detections with shorter detection times. Our code and parts of our dataset are made publicly available. KW - Fahrerassistenzsystem KW - Radfahrer Y1 - 2020 UR - https://ieeexplore.ieee.org/document/9413233 ER - TY - BOOK A1 - Preuß, Norbert A1 - Schöne, Lars Bernhard T1 - Real Estate und Facility Management aus Sicht der Consultingpraxis N2 - Die überarbeitete und deutlich erweiterte 4. Auflage dieses anerkannten Standardwerkes liefert einen umfassenden Einblick in die Grundsäulen des Real Estate und Facility Managements. Von der Projektentwicklung, dem Projektmanagement, über das Transaktions-, Portfolio- und Risikomanagement bis hin zum Asset-, Property- und Facility Management. Alle wesentlichen Leistungen sowie Argumente für ein nachhaltiges Management der Sachwertanlage Immobilie, die hierfür notwendigen Strategien, Methoden sowie Vorgehensweisen werden detailliert dargelegt. Besonders informativ, anregend und aufschlussreich wird der Leser durch den interdisziplinären Ansatz sowie die umfangreichen aktuellen Beispiele, Tabellen und Abbildungen durch den Lebenszyklus der Immobilie geführt. Dieses Werk wendet sich seit nunmehr über 15 Jahren an drei Zielgruppen: Studenten, die sich mit den Grundlagen und den vertiefenden Aspekten der Bau- und Immobilienwirtschaft insgesamt oder mit einzelnen Elementen, wie etwa einer Portfolio-Analyse oder der Due Diligence, gezielt auseinandersetzen wollen; an Praktiker, die die aktuellen Entwicklungen ihres Fachgebiets verfolgen und eine fortwährende Aktualisierung ihres Wissenstandes anstreben sowie Wissenschaftler, die durch die kritische Reflexion der hier beschriebenen Expertisen Impulse für die Weiterentwicklung ihres Forschungsgebietes erhalten können. KW - Facility-Management KW - Consulting Engineering Y1 - 2016 UR - https://link.springer.com/content/pdf/10.1007%2F978-3-662-48291-9.pdf SN - 978-3-662-48290-2 U6 - https://doi.org/10.1007/978-3-662-48291-9 PB - Springer Vieweg CY - Berlin ER - TY - BOOK A1 - Reisbeck, Tilman A1 - Schöne, Lars Bernhard T1 - Immobilien-Benchmarking: Ziele, Methoden, Nutzen und Praxis N2 - Dieses Werk zeigt Benchmarking als Analysemethode des Immobilien-Controllings besonders im Kontext der Renditeoptimierung und Kostensenkung. In der überarbeiteten 3. Auflage wird seine Anwendung in den Disziplinen Investment- und Portfoliomanagement sowie Asset-, Property- und Facility Management sowie die integrale Bedeutung innerhalb des Immobilienlebenszyklus beschrieben. Die erforderlichen Grundlagen, Methoden, Vorgehensweisen, als auch die einzelnen Bausteine des Benchmarkings werden detailliert und anhand einer Vielzahl von Praxisbeispielen erläutert. KW - Immobilienbewertung KW - Benchmarking Y1 - 2017 UR - https://link.springer.com/content/pdf/10.1007%2F978-3-662-55366-4.pdf SN - 978-3-662-55365-7 U6 - https://doi.org/https://doi.org/10.1007/978-3-662-55366-4 PB - Springer Vieweg CY - Berlin ER - TY - JOUR A1 - Söthje, Dominik A1 - Ischdonat, Nils A1 - Braune, Christian A1 - Setzer, Andreas A1 - Dreyer, Christian T1 - Zweites Leben für Flugzeugkabinen – Chemisches Recycling duromerbasierter faserverstärkter Kunststoffe JF - Kunststoffe KW - Faserverstärkter Kunststoff KW - Recycling KW - Flugzeugkabine Y1 - 2016 VL - 2016 IS - 9 SP - 205 EP - 208 ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Ran an die Fasern JF - K-Magazin KW - Faserverstärkter Kunststoff Y1 - 2019 VL - 2019 IS - 02 SP - 40 EP - 41 ER - TY - CHAP A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Low-Cost High-Performance Polymers for Aviation Applications T2 - Abstractbook: NanoCarbon Annual Conference 2019 KW - Polymere KW - Hochleistungswerkstoff KW - Luft- und Raumfahrtindustrie Y1 - 2019 VL - 2019 CY - Würzburg ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Neues Recyclingverfahren JF - Konstruktionspraxis KW - Recycling Y1 - 2019 VL - 2019 IS - 5 SP - 21 EP - 21 ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Recyceln von Faserverbundkunststoffen JF - Kunststoffxtra KW - Faserverstärkter Kunststoff KW - Recycling Y1 - 2019 VL - 2019 IS - 5 SP - 24 EP - 25 ER - TY - CHAP A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Recycling of carbon fiber reinforced epoxy resins T2 - Abstractbook: NanoCarbon Annual Conference 2021 KW - Kohlenstofffaserverstärkter Kunststoff KW - Epoxidharz KW - Recycling Y1 - 2021 CY - Würzburg ER - TY - JOUR A1 - Söthje, Dominik A1 - Schamel, Elisabeth A1 - Schlachter, Herbert A1 - Wehnert, Gerd T1 - Chemical Recycling of Carbon Fiber Reinforced Epoxy Composites Using Mild Conditions JF - Chemie Ingenieur Technik KW - Epoxide KW - Recycling KW - Kohlenstofffaserverstärkter Kunststoff Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1002/cite.202100048 SN - 1522-2640 VL - 93 IS - 10 SP - 1 EP - 11 PB - Wiley-VCH GmbH CY - Weinheim ER - TY - RPRT A1 - Heinecke, Jana A1 - Schöne, Lars Bernhard T1 - Standortanalyse im deutschen Einzelhandel : empirische Untersuchung immobilienwirtschaftlicher Faktoren T2 - IIWM-Paper No. 3: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Der Fokus dieser Schrift liegt auf der Untersuchung der immobilienwirtschaftlichen Einflussfaktoren im Einzelhandel. Im Rahmen dieses Arbeitspapieres wurden 67 Einflussfaktoren identifiziert, zehn übergeordneten Faktorengruppen zugeteilt und in Form eines Standortfaktorenkataloges zusammengefasst. Unter der Zielsetzung die praktische Relevanz dieser Faktoren zu ermitteln, wurde in diesem Zusammenhang die Studie ‚Empirische Untersuchung der Standortfaktoren im Einzelhandel‘ mittels eines webbasierten Fragebogens durchgeführt. Da im Rahmen der Studie ebenfalls die Frage beantwortet werden sollte, ob und wie die Bedeutsamkeit der Faktoren je nach Einzelhandelsbranche variiert, wurden die Ergebnisse der Studie - getrennt nach dem Gesichtspunkt des Sortiments – für die Teilbranchen Food/Near-Food, nur Food und Non-Food des Einzelhandels ausgewertet. Dabei hat sich die Annahme, dass Unternehmen verschiedener Teilbranchen des Einzelhandels unterschiedliche Ansprüche an einen Standort stellen, im Rahmen der Studie bestätigt. Im Vergleich der Ergebnisse der einzelnen Branchen wird deutlich, dass die Standortfaktoren (von den einzelnen Branchen) grundsätzlich in einer anderen Reihenfolge priorisiert werden. Dies macht deutlich, dass auch innerhalb der Gesamtbranche des Einzelhandels spezifische Anforderungen und Bedürfnisse der verschiedenen Teilbranchen an einen Standort bestehen. KW - Einzelhandel KW - Standortplanung Y1 - 2018 UR - https://www.econstor.eu/bitstream/10419/190953/1/1043862668.pdf ER - TY - RPRT A1 - Schmitt, Timo A1 - Schöne, Lars Bernhard T1 - Staatliche Interventionen in Wohnimmobilienmärkten : Synopse internationaler Regulierungen T2 - IIWM-Paper No. 2: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Wirkung des in Deutschland eingeführten Mietrechtsnovellierungsgesetzes. Zentrales Ziel der Arbeit ist es, die bisher wahrnehmbaren Auswirkungen dieser Interventionsmaßnahme darzustellen und die Ergebnisse dieser ersten Untersuchung durch eine Gegenüberstellung mit staatlichen Maßnahmen im internationalen Raum zu festigen. Dabei wurden sowohl dem Mietrechtsnovellierungsgesetz ähnliche Regulierungen als auch anderweitige Maßnahmen untersucht, die von Staaten zur Dämpfung und Kontrolle der Mietpreise angewandt werden. Es wurde hauptsächlich auf statistische Daten sowie vorhandene Literatur und wissenschaftliche Analysen zurückgegriffen. Nach der Wirkungsanalyse der jeweiligen Maßnahmen wird im Fazit auf die Sinnhaftigkeit und Wirkung von staatlichen Interventionsmaßnahmen zur Mietpreisbegrenzung im Allgemeinen eingegangen. KW - Mietpreis KW - Mitrecht Y1 - 2018 UR - https://www.econstor.eu/bitstream/10419/175358/1/IIWM-Paper-No-2.pdf ER - TY - CHAP A1 - Franz, Daniel A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Superimposed beam deflection using acousto-optical deflectors in combination with a galvanometer scanner T2 - Lasers in Manufacturing - LiM 2021 KW - Galvanometer Y1 - 2021 ER - TY - CHAP A1 - Lutz, Christian A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Marx, Jan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Optical system for multi Bessel beam high power ultrashort pulsed laser processing using a spatial light modulator T2 - Lasers in Manufacturing - LiM 2021 N2 - We report on an optical setup for multi Bessel beam processing combining a refractive axicon and a spatial light modulator. Based on their particular beam profile, Bessel beams exhibit various advantages over conventional Gaussian beams for ultrashort pulsed laser processing. Especially for micromachining of transparent materials, applications such as micro-hole drilling or the generation of voids benefit from the increased focal length of the applied Bessel beam. In addition, on account of the significantly increased average output power of industrial ultrashort pulsed lasers over the last years, there is a high demand on multi spot applications for using the available laser power in efficient production processes. Our optical concept combines the dynamic possibilities of beam splitting using spatial light modulator with the benefits of Bessel beams facilitating multi Bessel beam processing. KW - Ultrakurzzeitlaser KW - Lichtmodulator Y1 - 2021 ER - TY - CHAP A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Chaoticity Versus Stochasticity in Financial Markets T2 - International Symposium on Forecasting KW - Chaos KW - Financial Market KW - S&P500 KW - Kapitalmarkt Y1 - 2021 VL - 2021 ER - TY - JOUR A1 - Kefer, Stefan A1 - Pape, Dominik A1 - Roth, Gian-Luca A1 - Hessler, Steffen A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Micromilling-assisted fabrication of monolithic polymer ridge-type waveguides with integrated photonic sensing structures JF - Optical Materials Express N2 - This study demonstrates and discusses a novel approach for the fabrication and rapid prototyping of monolithic photonic platforms comprising a ridge-type waveguide with integrated sensing structures. First, the bulk injection-molded cyclic olefin copolymer substrates are micromilled in order to define the physical extension of the ridge structure. Cross-sections down to 30 × 30 µm2, exhibiting a mean surface roughness of 300 nm, are achieved with this process. Subsequently, UV radiation is used to modify the ridge structure’s refractive index, which leads to the formation of an optical waveguide. By employing a phase mask, it is possible to equip the photonic platform with a Bragg grating suitable for temperature measurements with a sensitivity of −5.1 pm K-1. Furthermore, an integrated Fabry-Pérot cavity, generated during the micromilling step as well, enables refractive index measurements with sensitivities up to 1154 nm RIU-1. KW - Cyclic Olefin Copolymers KW - Micromilling KW - Bragg Grating KW - Fabry-Pérot Etalon KW - Bragg-Reflektor KW - Optischer Sensor Y1 - 2021 UR - https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-11-8-2389&id=453071 U6 - https://doi.org/https://doi.org/10.1364/OME.425778 VL - 11 IS - 8 SP - 2389 EP - 2400 ER - TY - JOUR A1 - Kefer, Stefan A1 - Bischoff, Kay A1 - Roth, Gian-Luca A1 - Haubner, Julian A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Tunable Bulk Polymer Planar Bragg Gratings Electrified via Femtosecond Laser Reductive Sintering of CuO Nanoparticles JF - Advanced Optical Materials N2 - This contribution demonstrates and discusses electrically tunable polymer planar Bragg gratings based on bulk cyclic olefin copolymers. A lithographic single-writing-step method and femtosecond laser reductive sintering of copper(II) oxide nanoparticles are subsequently employed in order to generate buried photonic structures and copper conducting paths on top of the polymer substrate. This way, the necessary number of process steps for fabricating a planar polymer-based electro-optical device is greatly reduced. The response of a fully electrified grating structure follows temperature changes, induced by the copper conducting path, with sensitivities up to −31 pm K−1. Dilatometric measurements show that the specimen's behavior is correlated to the situationally reduced thermal expansion of the bulk polymer substrate. In consequence, the tuning response of the photonic platform follows a second order polynomial, whereas a direct current of 30 mA, which correlates to a power consumption of 18.3 mW, leads to a local temperature increase and a residual Bragg wavelength shift of 19.6 K and −547 pm, respectively. Moreover, the outstanding flexibility of the proposed fabrication concept is underlined by demonstrating alternative conducting path geometries, whereas one of the additional designs is adapted to control the spectral width of the Bragg grating's reflection peak. KW - Bragg gratings KW - CuO nanoparticles KW - cyclic olefin copolymers KW - electro-optic tuning KW - integrated photonics KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/10.1002/adom.202002203 U6 - https://doi.org/https://doi.org/10.1002/adom.202002203 VL - 9 IS - 13 SP - 2002203 EP - 2002203 ER - TY - GEN A1 - Kefer, Stefan A1 - Bischoff, Kay A1 - Roth, Gian-Luca A1 - Haubner, Julian A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Tunable Bulk Polymer Planar Bragg Gratings Electrified via Femtosecond Laser Reductive Sintering of CuO Nanoparticles (Advanced Optical Materials 13/2021) N2 - This cover image outlines the fabrication method of a polymer planar Bragg grating electrified via femtosecond laser reductive sintering of CuO nanoparticles (see article number 2002203 by Stefan Kefer and co-workers). Based on this sophisticated methodology, bulk cyclic olefin copolymer substrates can be equipped with integrated photonic structures comprising a waveguide as well as a Bragg grating. Its reflective characteristics can be efficiently tuned by means of the subsequently generated Cu conducting path, whereas the applied femtosecond laser process enables an almost limitless degree of freedom towards conducting path geometries. N2 - Cover zum zugehörigen Artikel KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/10.1002/adom.202170048 U6 - https://doi.org/https://doi.org/10.1002/adom.202170048 ER - TY - JOUR A1 - Herzog, Anna Laura A1 - Jouanne-Diedrich, Holger K. von A1 - Wanner, Christoph A1 - Weismann, Dirk A1 - Schlesinger, Tobias A1 - Meybohm, Patrick A1 - Stumpner, Jan ED - Serra, Raffaele T1 - COVID-19 and the kidney: A retrospective analysis of 37 critically ill patients using machine learning JF - Plos one N2 - Introduction There is evidence that SARS-CoV2 has a particular affinity for kidney tissue and is often associated with kidney failure. Methods We assessed whether proteinuria can be predictive of kidney failure, the development of chronic kidney disease, and mortality in 37 critically ill COVID-19 patients. We used machine learning (ML) methods as decision trees and cut-off points created by the OneR package to add new aspects, even in smaller cohorts. Results Among a total of 37 patients, 24 suffered higher-grade renal failure, 20 of whom required kidney replacement therapy. More than 40% of patients remained on hemodialysis after intensive care unit discharge or died (27%). Due to frequent anuria proteinuria measured in two-thirds of the patients, it was not predictive for the investigated endpoints; albuminuria was higher in patients with AKI 3, but the difference was not significant. ML found cut-off points of >31.4 kg/ m2 for BMI and >69 years for age, constructed decision trees with great accuracy, and identified highly predictive variables for outcome and remaining chronic kidney disease. Conclusions Different ML methods and their clinical application, especially decision trees, can provide valuable support for clinical decisions. Presence of proteinuria was not predictive of CKD or AKI and should be confirmed in a larger cohort. KW - COVID-19 KW - Maschinelles Lernen KW - Niereninsuffizienz Y1 - 2021 UR - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0251932 U6 - https://doi.org/https://doi.org/10.1371/journal.pone.0251932 VL - 2021 IS - Online/2021 SP - 1 EP - 15 ER - TY - JOUR A1 - Herzog, Anna Laura A1 - Busch, Jonas A1 - Wanner, Christoph A1 - Jouanne-Diedrich, Holger K. von ED - Iglesias-Osma, Maria Carmen T1 - Survey about do-it-yourself closed loop systems in the treatment of diabetes in Germany JF - Plos one N2 - Continuous glucose monitoring (CGM) improves treatment with lower blood glucose levels and less patient effort. In combination with continuous insulin application, glycemic control improves and hypoglycemic episodes should decrease. Direct feedback of CGM to continuous subcutaneous insulin application, using an algorithm is called a closed-loop (CL) artificial pancreas system. Commercial devices stop insulin application by predicting hypoglycemic blood glucose levels through direct interaction between the sensor and pump. The prediction is usually made for about 30 minutes and insulin delivery is restarted at the previous level if a rise in blood glucose is predicted within the next 30 minutes (hybrid closed loop system, HCL this is known as a predictive low glucose suspend system (PLGS)). In a fully CL system, sensor and pump communicate permanently with each other. Hybrid closedloop (HCL) systems, which require the user to estimate the meal size and provide a meal insulin basis, are commercially available in Germany at the moment. These systems result in fewer hyperglycemic and hypoglycemic episodes with improved glucose control. Open source initiatives have provided support by building do-it-yourself CL (DIYCL) devices for automated insulin application since 2014, and are used by a tech-savvy subgroup of patients. The first commercial hybrid CL system has been available in Germany since September 2019. We surveyed 1054 patients to determine which devices are currently used, which features would be in demand by potential users, and the benefits of DIYCL systems. 9.7% of these used a DIYCL system, while 50% would most likely trust these systems but more than 85% of the patients would use a commercial closed loop system, if available. The DIYCL users had a better glucose control regarding their time in range (TIR) and glycated hemoglobin (HbA1c). KW - Kontinuierliches Glucosemonitoring Y1 - 2020 UR - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0243465 U6 - https://doi.org/https://doi.org/10.1371/journal. pone.0243465 VL - 2020 IS - Online/2020 SP - 1 EP - 17 ER - TY - RPRT A1 - Rock, Verena A1 - Schlesinger, Sarah A1 - Nolan, Sean A1 - Liebold, Philipp J. A1 - Zinn, Patrick T1 - PropTech Germany 2020 Studie T2 - PropTech Germany Studien N2 - Das Stichwort „PropTech” kursiert bereits seit einigen Jahren auf dem Immobilienmarkt und bildet den Überbegriff für Start-ups, die mit digitalen Technologien und innovativen Geschäftsmodellen die Digitalisierung in der Bau- und Immobilienbranche vorantreiben. Seit geraumer Zeit ist ein kontinuierlicher Anstieg der Anzahl von PropTech-Unternehmen im deutschen Markt zu verzeichnen. Entsprechend werden auch immer mehr technologische Einzellösungen angeboten, die oftmals allerdings nur einen Abschnitt eines Prozesses innerhalb des Immobilienlebenszyklus digitalisieren. Die daraus resultierende Kleinteiligkeit von PropTech-Unternehmen stößt in der immobilienwirtschaftlichen Fachöffentlichkeit auf Kritik, führt sie doch zu einer zunehmenden Intransparenz und Komplexitätssteigerungen innerhalb des Marktes. Die Mehrzahl der bisher veröffentlichten Studien richtet ihr Hauptaugenmerk dabei vor allem auf die Perspektiven und Einschätzungen der etablierten Immobilienwirtschaft hinsichtlich PropTech-Unternehmen und Digitalisierung. Demgegenüber werden die Ansichten und Auffassungen der PropTech-Unternehmen oftmals nicht hinreichend berücksichtigt. Es wurde noch nicht umfassend herausgearbeitet, wie PropTechs aktiv versuchen, im deutschen Immobilienmarkt die Digitalisierung weiter voranzutreiben und welchen Hürden sie hierbei begegnen. Diese Lücke beabsichtigt die vorliegende Studie zu füllen. Überdies bildet die Untersuchung eine Ausgangsbasis für anschließende Folgestudien, welche die Ergebnisse quantitativ verifizieren, um schlussendlich einen Abgleich mit der Perspektive der etablierten Immobilienunternehmen vorzunehmen. Diese Studie untersucht die Erfahrungen, Herausforderungen und Hürden von PropTech-Unternehmen beim Markteintritt in die deutsche Immobilienbranche. Basierend auf einem strukturierten Fragebogen wurden neun ausgewählte PropTech-Unternehmen aus unterschiedlichen Entwicklungsphasen zu folgenden Themenbereichen befragt: Stimmungsindikatoren: Markt- und Geschäftsentwicklung: Wie entwickelt sich die Auftragslage? • Von der Idee bis zum Business Model: Worauf kommt es an? • Hürden beim Markteintritt in die deutsche Immobilienwirtschaft: Welches sind die wesentlichen Hürden bei der Entwicklung des Geschäftsmodells, der Kundenakquise und der Etablierung des Produktes am Markt? • Kooperationen im PropTech-Markt: Wo liegt die Zukunft? KW - Immobilienwirtschaft KW - Digitalisierung Y1 - 2020 UR - https://www.iiwm.de/wp-content/uploads/2021/03/PropTech-Germany-2020-Studie.pdf ER - TY - RPRT A1 - Rock, Verena A1 - Brehm, Nadine A1 - Schlesinger, Sarah A1 - Liebold, Philipp J. T1 - PropTech Germany 2021 Studie T2 - PropTech Germany Studien N2 - PropTech-Charakteristika Die 185 teilnehmenden PropTechs sind den Reifegrad-Clustern Early Stager (19,5%), Grown Ups (57,8%) und Conquerer (22,7%) zuzuordnen. 48% der Prop-Techs sind sehr junge Unternehmen mit den Gründungsjahren 2018 - 2020. Durchschnittlich liegen 1,6 Jahre zwi-schen Gründung des Unternehmens und Launch des Produktes. Jeweils die Mehrheit der Teilnehmer bedient ausschließlich das B2B-Segment (80,0%), operiert mit weniger als 15 Mitarbeitern (65,4%) und befindet sich im Produkt-Entwicklungsstadium des laufenden Betriebs (70,8%). Die Spanne der von den PropTechs erzielten Umsätze ist weit. Korrespondierend mit dem “jungen” Unternehmensalter erzielten 29,7% der PropTechs nur bis zu 10.000€ Jahresumsatz in 2020. Jedoch geben an-dererseits 16,2% der Befragten einen Jahresumsatz von über 1 Mio. € an. Technologisch überwiegt die Plattformtechnologie in allen Lebenszyklusphasen. Als Einnahmenmodell existieren mehrheitlich Subscription- oder Lizenz-vereinbarungen, und eine laufende monatliche oder jährliche Gebühr wird meist als Preismodell genutzt. Schnittstellen verschiedenen Typs sind bereits bei 73,0% der PropTechs verfügbar. PropTechs im Immobilien-Lebenszyklus In der Immobilienwertschöpfungskette bedient das Gros der Teilnehmer den Betrieb die Bewirtschaftung von Immo-bilien, wobei jedoch im Durchschnitt 3,2 Lebenszyklusphasen von den Prop-Techs bedient werden. Somit bewegen sie sich tendenziell nicht in den tradierten Grenzen und Prozessen der Immo-bilienwirtschaft. Die meisten PropTechs mit hohen Umsätzen sind in der Be-wirtschaftung oder Vermarktung von Immobilien aktiv. Als Assetklasse dominiert klar Wohnen, gefolgt von Büro und Mixed-Use, wobei aber ein Prop-Tech durchschnittlich 4,3 Assetklassen bedient. Im Wohnsegment dominieren jedoch die PropTechs mit noch sehr geringen Umsätzen. Hier herrscht auch der höchste B2C Anteil der Assetklassen vor. Nur 20,5% der PropTechs legen sich auf eine Assetklasse fest. Aktuelle Lage des deutschen PropTech-Marktes Für das Jahr 2020 empfinden die Prop-Techs die Auftragslage als äußerst posi-tiv, und auch der mittelfristigen Entwicklung der Jahre bis Ende 2023 blickt eine überwältigende Mehrheit positiv entgegen. So verzeichneten in 2020 70,8% der PropTechs mehr Neugeschäft, davon 35,9% deutlich mehr Neugeschäft. Für 2021 bis 2023 erwarten 52,4% der PropTechs deutlich mehr Neugeschäft und insgesamt über 91,4% sehen positive Vorzeichen für die Marktentwicklung. Hinsichtlich des Corona-Effekts konn-ten die Unternehmen mehrheitlich eher von der Pandemie profitieren; für die Zukunft ergibt sich ein aus ihrer Sicht noch positiveres Bild. Ganze 66,5% erwarten zukünftig eine Zunahme ihres Geschäftes durch Corona und weitere 26,0% sehen keine Auswirkungen. Lediglich 7,6% erwarten pandemiebedingt eine Abnahme des eigenen Geschäfts. Nach eigenen Einschätzungen gehören PropTechs also mehrheitlich zu den Gewinnern der Pandemie. Herausforderungen für PropTechs im deutschen Immobilienmarkt In der Studie wurden drei Phasen des proptechseitigen Vermarktungsprozesses untersucht: Aufbau des Geschäftsmodells, Produktverkauf und Implemen-tierung. Die Phase des Produktverkaufs ist für 53% der PropTechs die hürden-reichste Phase deutlich vor dem Aufbau des Geschäftsmodells und Implementierung beim Kunden. Die wesentlichen Herausforderungen beim Aufbau des Geschäftsmodells sind für alle Prop-Tech-Cluster die Entscheidungsstrukturen beim Kunden, gefolgt von dem geringen Druck zur Digitalisierung in der Immobilienbranche und Produktentwicklungskosten sowie der Zugang zu Daten, wobei dieser für Early Stager am schwierigsten erscheint. In der Phase des Produktverkaufs zeigt sich, dass die größte Hürde in der geringen Risikobereitschaft des Establishments, in Technologien von PropTechs zu investieren, liegt - gepaart mit mangelndem Vertrauen und einem mangelnden Verständnis in Bezug auf die Technologie sowie das Potenzial der Produkte. Weiterhin liegt im schwierigen Zugang zum richtigen Ansprechpartner eine wesentliche Verkaufshürde. Hier ergibt sich aus Sicht der PropTechs, dass die operativ verantwortliche Fach-abteilung im Establishment, in der das Produkt angewendet würde, der wesentliche Influencer für die Kaufentscheidung ist. Als relevantester Ent-scheider wird hingegen mehrheitlich der CEO gesehen. Dies kann ein Hinweis darauf sein, dass Digitalisierungsent-scheidungen immer noch auf strategischer Ebene getroffen werden. Prop-Techs, die es bei einem Kunden bis zur Implementierung geschafft haben, sind über den Berg der Hürden und sehen sich fortan nur moderateren Herausforderungen gegenüber. Von diesen sind die mangelnde Priorität des Projektes auf Kundenseite sowie fehlende C-Level-Sponsorship bzgl. der Durchsetzung von Entscheidungen die wesentlichen Herausforderungen. Somit sehen sich PropTechs mit wenig Unerwartetem bei der Implementierung konfrontiert, dürfen aber auch keine Priorität und Unterstützung vom Kunden erwarten. Kooperationen Kooperationen zwischen PropTechs sind überwiegend technischer Natur und haben einen hohen Stellenwert; 71,9% der Bef ragten haben bereits horizontale oder vertikale Kooperationen. Ziele sind hier meist Umsatz-, Netzwerk- und Zielgruppenerweiterung. Die Kooperationsbereitschaft nimmt mit steigendem Reifegrad der PropTechs zu; am ausgeprägtesten ist sie bei Conquerers, wo Kooperationen als Vorteil des Markteintritts nach Deutschland interpretiert werden können. Durch vertikale Kooperationen können PropTechs den Kunden ein er-weitertes bzw. kompletteres Lösungs-portfolio sowie teilweise eine deutlich breitere Anzahl an Use Cases anbieten. Damit einhergehend stehen auch die Themen Ökosystem und Plattformen. PropTechs können mittels Partnerschaften / Kooperationen einen größeren Teil der Wertschöpfungskette abbilden, ihre Angebote bündeln und somit „one stop shop” Lösungen für die Kunden anbieten. KW - Immobilienwirtschaft KW - Digitalisierung Y1 - 2021 UR - https://www.iiwm.de/wp-content/uploads/2021/03/PropTech-Germany-2021-Studie-2.pdf ER - TY - CHAP A1 - Cotroneo, Vincenzo A1 - Bruni, Ricardo A1 - Döhring, Thorsten A1 - Ferreira, Desiree A1 - Gibertini, Eugenio A1 - Henriksen, Peter A1 - Magagnin, Luca A1 - Massahi, Sonny A1 - Pareschi, Giovanni A1 - Romaine, Suzanne A1 - Sethares, Leandra A1 - Sironi, Giorgia A1 - Spiga, Daniele A1 - Tagliaferri, Gianpiero A1 - Valsecchi, Giuseppe T1 - Development of low-density coatings for soft x-ray reflectivity enhancement for ATHENA and other missions T2 - Proceedings of SPIE N2 - Metallic coatings made of precious metals (e.g. Ir, Pt or Au) with high atomic number Z have been traditionally employed at grazing incidence for X-rays reflection and focalization. These materials offer a range of reflection extended to higher energies, but also present a series of absorption edges, which limit the reflectivity in the 2-4 keV band and below. Therefore the search for alternative coatings, able to improve the reflection in the soft energy range, is particularly relevant for the development of future telescopes, like ATHENA (ESA), Lynx (NASA) and eXTP (CAS). Low-Z overcoatings (e.g. carbon or B4C), applied on top of the high-Z metallic layer, can enhance the reflectivity in the softer band (mainly below 2 keV), but conventional deposition methods for these materials are not easily compatible with some of the mainstream technologies for mirror fabrication (notably, the silicon pore optics that will be used for the ATHENA X-ray mission which is being implemented by ESA). In this work we discuss novel solutions (carbon-like overcoatings realized by dip coating or vapor phase deposition), which can be particularly convenient for the application to ATHENA and to future telescopes. KW - X-ray KW - optics KW - ATHENA KW - iridium KW - reflectivity KW - Röntgenteleskop Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2599803 VL - 2021 IS - 11852 SP - 118524P-1 EP - 118524P-13 PB - SPIE ER - TY - RPRT A1 - Lossau, Tobias A1 - Focke, Christian T1 - REITs in Europa : ein Vergleich von rechtlichen Rahmenbedingungen und Marktkapitalisierungen T2 - IIWM-Paper No. 4: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier liefert eine vergleichende Bestandsaufnahme des REIT-Marktes in Eu-ropa. Für ausgewählte Länder (Deutschland, Großbritannien, Frankreich, Belgien und Nieder-lande) wird analysiert, wie die wesentlichen rechtlichen Regelungen bezüglich REITs in dem Land aussehen, wobei Gemeinsamkeiten und Unterschiede der nationalen Regelungen deut-lich werden. Dabei wird auch dargestellt, wie sich der REIT-Markt des jeweiligen Landes unter den dort gegebenen Voraussetzungen entwickelt hat. Dieser Teil der Analyse liefert sowohl Informati-onen zu den wichtigsten REIT-Gesellschaften wie auch zur gesamten Marktkapitalisierung des REIT-Segments in dem Land. Das Arbeitspapier schließt mit dem Fazit, dass sich die Ausgestaltung des REIT-Regimes auf die Entwicklung dieses Kapitalmarktsegments in den jeweiligen Ländern erkennbar ausgewirkt hat. KW - Immobilienfonds auf Aktien KW - Europäische Union Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196580/1/1664852808.pdf ER - TY - RPRT A1 - Bauer, Christine A1 - Rock, Verena T1 - Die Revitalisierung von Shopping-Centern in Deutschland : Auswirkungen aktueller Trends auf das Shopping-Center Konzept T2 - IIWM-Paper No. 5: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Revitalisierung von Shopping-Centern in Deutschland. Mit diesem Papier wird das zentrale Ziel verfolgt, zu analysieren, welche Aus-wirkungen ausgewählte, aktuelle Trends auf den Einzelhandel und auf Shopping-Center ha-ben. Des Weiteren wird untersucht, welche Maßnahmen im Zuge einer Revitalisierung nötig sind, damit Shopping-Center in Zukunft erfolgreich am Markt bestehen können, oder ob das Konzept dieser Asset-Klasse generell nicht mehr zukunftsfähig ist. In diesem Zusammenhang werden auch Erfolgsfaktoren, Chancen und Risiken analysiert, die speziell im Zusammenhang mit der Revitalisierung von Shopping-Centern relevant sind. Um eine fundierte Ausarbeitung der genannten Punkte liefern zu können, wurde eine empirische Studie in Kooperation mit dem German Council of Shopping Centers e.V. durchgeführt. Diese wird im Rahmen des Arbeits-papiers mit der Revitalisierungsstudie von Sturm (2006)1, der letzten empirischen Analyse zu diesem Thema für den deutschen Markt, verglichen. KW - Einkaufszentrum Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196581/1/1664853367.pdf ER - TY - RPRT A1 - Richter, Sandra A1 - Schöne, Lars Bernhard T1 - Immobilien-Benchmarking : Clustern heterogener Immobilienbestände durch Regressionsanalysen T2 - IIWM-Paper No. 6: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit Immobilien-Benchmarking. Zentrales Ziel der Schrift ist es, einen Einblick in die bisherige Etablierung des Benchmarkings in den Managementebenen der Immobilienwirtschaft zu gewinnen und die Eigenschaft der Heterogenität der Immobilien im Benchmarking hervorzuheben. Dabei wird das Portfoliomanagement, das Asset Management, das Property Management sowie das Facility Management in Bezug auf die Potenzialhebung betrachtet. Weiterhin wird auch einen Einblick in die Regressionsanalyse gegeben. Um den Faktor der Heterogenität zu berücksichtigen, gilt es entsprechende Cluster abzuleiten. Beispielhaft wird eine Clusteranalyse plakativ an einem reduzierten Modell dargestellt. Im Fazit wird zusammenfassend auf die bisherige Etablierung des Benchmarkings in der Immobilienwirtschaft eingegangen sowie auf weitere Forschungsansätze hingewiesen. KW - Immobilienbewertung KW - Benchmarking Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196582/1/1664854673.pdf ER - TY - RPRT A1 - Neeb, Nora A1 - Schöne, Lars Bernhard T1 - Investmentmarkt für Logistikimmobilien im Kontext der Covid-19-Pandemie T2 - IIWM-Paper No. 7: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Analyse des Investmentmarktes für Logistikimmobilien mit der Fokussierung auf die Covid-19-Pandemie. Zentrales Ziel der Schrift ist es, den Investmentmarkt für Logistikimmobilien und die Auswirkungen, die die Covid-19-Pandemie auf diesen genommen hat, zu analysieren. Dabei werden die (Mega-)Trends auf welche die Pandemie Einfluss genommen hat, beleuchtet. Weiterhin werden wichtige Marktkennzahlen eines Investmentmarktes definiert. Diese Kennzahlen, sowie weitere essentielle Marktparameter dienen anschließend der Marktanalyse des Jahres 2019. Darauf folgt eine detaillierte Betrachtung der Marktentwicklung 2020 – dem Covid-Jahr. Hierbei werden die vier Quartale gesondert analysiert um etwaige Veränderungen erkennen zu können. Im Fazit erfolgt eine ausführliche Zusammenfassung der aktuellen Stimmung auf dem Logistikinvestmentmarkt und es wird ein vorsichtiger Blick auf künftige Entwicklungen geworfen. KW - Gewerbeimmobilien KW - Logistikunternehmen KW - COVID-19 Y1 - 2021 UR - https://www.iiwm.de/wp-content/uploads/2021/06/IIWM-Paper-No-7-Logistik-Neeb_Schoene-ISSN2568-5872.pdf ER - TY - CHAP A1 - Kefer, Stefan A1 - Roth, Frederick A1 - Kaloudis, Michael A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Monitoring of Composite Bicycle Components using Polymer Planar Bragg Gratings T2 - SMSI 2021 - Sensors and Instrumentation N2 - This study demonstrates mobile load monitoring of a composite bicycle component using an application- customized polymer planar Bragg grating sensor, evaluated by a mobile interrogation unit. After a referencing procedure, the mechanical load of a seat post is monitored while cycling through a test track. KW - Bragg Grating KW - Composites KW - Cyclic Olefin Copolymers KW - Micromilling KW - Load Monitoring KW - Bragg-Reflektor KW - Verbundwerkstoff KW - Fahrrad Y1 - 2021 UR - https://www.ama-science.org/proceedings/details/3992 SN - 978-3-9819376-4-0 U6 - https://doi.org/10.5162/SMSI2021/B9.2 SP - 161 EP - 162 PB - AMA Service GmbH CY - Wunstorf, Germany ER - TY - GEN A1 - Giovanni, Pareschi A1 - Döhring, Thorsten A1 - Valsecchi, Guiseppe A1 - Magagnin, Luca A1 - Bradshaw, Miranda A1 - Burwitz, Vadim A1 - Civitani, Marta Maria A1 - Cotroneo, Vincenzo A1 - Gibertini, Eugenio A1 - Pelliciari, Carlo A1 - Sironi, Giorgia A1 - Yang, Yang T1 - Enhancing the ATHENA effective area at low x-ray energies with unconventional overcoatings T2 - Proceedings of the X-RAY ASTRONOMY 2019 conference N2 - Low density overcoatings (mainly based on materials containing Carbon) onto usual hi Z materials (like Ir, Au or Pt) have been proposed more than 10 years ago for enhancing the X-ray reflectivity at low energy (between 0.5 and 4 keV) in X-ray astronomical optics. The hack is to use the total reflection from the low density material (which do not suffer much the photoelectric absorption) at low energy, while the photons at high energy are reflected by the high density material. Now for several future projects like e.g. ATHENA and eXTP it is foreseen the use of low density overcoatings that will importantly increase the effective area at low energy. In this poster we will discuss about the use of materials different from the ones considered so far, in particular based on a thin layer of Chromium followed by another layer of a Carbon-like material, and of novel approaches for their application. N2 - Poster KW - X-ray KW - mirror KW - coating KW - reflectivity KW - ATHENA KW - Röntgenteleskop Y1 - 2019 UR - https://indico.ict.inaf.it/event/720/contributions/5665/ VL - 2019 SP - 1 EP - 1 ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Marsikova, Veronika A1 - Hudec, Rene A1 - Flachs, Dennis A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Rukdee, Surangkhana A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Inneman, Adolf A1 - Klementova, Mariana A1 - Zeising, Sebastian A1 - Langmeier, Andreas T1 - Lobster eye type X-ray telescope with chromium-iridium coated tri-layer mirrors T2 - Proceedings of SPIE N2 - For space-born astronomical X-ray telescopes, iridium-based reflective layer systems are known as highly effective mirrors coatings. During the recent years, Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague jointly developed stress compensated chromium-iridium coatings for this application. To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium were applied in addition. Now a prototype of a wide-field, imaging X-ray telescope of Lobster Eye type is assembled at the company RIGAKU. For this purpose a small series of 34 mirrors based on 100 x 50 mm semiconductor grade silicon substrates has been coated at Aschaffenburg University. The applied tri-layer system consists of a stack of 40 nm chromium, which act as adhesive layer and compensates layer stress, a 30 nm iridium thick reflective layer, and an additional overcoat layer of 6 nm chromium. This layer system have been analysed by AFM and TEM images. The mirrors are assembled into an aluminium frame to build a 2D Lobster Eye type telescope. The designed focal length of this wide field X-ray telescope is two meter. To study the performance of the tri-layer coating system, a twin LE telescope with convenient gold coatings was manufactured also. Performance measurements of both telescopes and under same conditions are planned at the PANTER test facility at the Max-Planck Institute for Extraterrestrial Physics. First experimental results, their comparison with theoretical simulations and the comparison between both models will be presented in this contribution. KW - telescope KW - Lobster Eye KW - X-ray KW - mirror KW - iridium KW - Röntgenteleskop KW - Röntgenspiegel Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2589266 VL - 2021 IS - 11776 SP - 1177605-1 EP - 1177605-8 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Zeising, Sebastian A1 - Flachs, Dennis A1 - Stehlikova, Veronika A1 - Burwitz, Vadim A1 - Krumrey, Michael K. A1 - Cotroneo, Vincenzo A1 - Klementova, Mariana T1 - Characterisation of X-ray mirrors based on chromium-iridium tri-layer coatings T2 - Proceedings of SPIE N2 - Iridium-based layer systems are highly effective mirror coatings for space-born X-ray telescopes. During the recent years, Aschaffenburg University of Applied Sciences and its partners developed stress compensated chromium-iridium coatings for such astronomical applications, using chromium as an adhesive layer between iridium reflective layer and mirror substrate. However, there was room for improvement: To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium are applied in addition now. This layer system has been analyzed by atomic force microscopy and transmission electron microscopy images. Furthermore, the reflectivity of such innovative X-ray mirrors based on chromium-iridium tri-layer coatings was recently measured at PTB's four-crystal monochromator beamline at the synchrotron radiation facility BESSY II. The experimental results, obtained for photon energies between 1.9 keV and 11 keV at two grazing incidence angles (0.6 degree and 0.9 degree) and their comparison with corresponding simulations are presented in this contribution. When compared to simulations of pure iridium coatings, a significantly higher reflectivity was achieved especially in the soft X-ray regime between 2 keV and 4 keV. Such chromium-iridium tri-layer coatings have high potential to increase the effective area for X-ray telescopes in Lobster Eye Design, for Wolter-I type X-ray optics, and for silicon pore optics as considered for the ATHENA telescope of the European Space Agency. KW - iridium KW - mirror KW - X-ray KW - coating KW - telescope KW - Röntgenspiegel KW - Röntgenteleskop KW - Iridium Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2592551 VL - 2021 IS - 11776 SP - 1177607-1 EP - 11776076 PB - SPIE ER - TY - GEN A1 - Döhring, Thorsten T1 - Advanced Materials and Manufacturing Technologies for Space Applications T2 - Proceedings of International Research Days N2 - The goal of this project is to develop satellite components for space-based astronomical satellite payloads. Thereby advanced materials like iridium and innovative manufacturing technologies will be applied. After environmental testing and space qualifications tests it is planned to do an astronomical experiment with a stratospheric balloon or a sounding rocket. The work is embedded in ACCASI („Aschaffenburg Competence Center for Astronomical and Space Instumentation“) N2 - Poster KW - satellite KW - iridium KW - telescope KW - mirror KW - Satellitentechnik KW - Iridium KW - Spiegelteleskop Y1 - 2021 VL - 2021 ER - TY - GEN A1 - Licciardello, Nadia A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Kolen´ko, Yury. V. A1 - Petrovykh, Dmitri Y. T1 - Innovative nanocomposite coatings for radiation shielding on satellites T2 - EuroNanoForum N2 - The current trend in development of low-cost satellites is based on small dimensions combined with advanced electronics. Traditionally, radiation-sensitive electronics on satellites are protected by tungsten or lead foils, which are high-density materials and contribute significantly to the overall mass of the satellite. Here, we design and investigate temperature-gradient-resistant lightweight silane-based composites containing micro- or nano-particles of W or WO3, taking inspiration from similar approaches in the medical field. While the polymeric matrix provides flexibility under thermal gradients (such as those occurring in satellites during their orbits) and low density, the particles enable shielding from soft X-rays and other radiation. For reference, thin tungsten films were deposited by magnetron sputtering. The properties of the two kinds of coatings were compared and the X-ray protective properties were investigated using both a custom-designed measurement setup and conventional X-ray absorption. The best performing radiation-protective coatings will be launched in a payload experiment on the INFANTE satellite. N2 - Poster KW - satellite KW - polymeric matrix KW - nanocomposite KW - radiation protection KW - Satellitentechnik KW - Strahlung Y1 - 2021 UR - https://euronanoforum2021.eu/ VL - 2021 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Freudenmann, Dominic A1 - Röcke, Nicole T1 - Nanostructured iridium catalysts for effective hydrogen peroxide decomposition T2 - EuroNanoForum N2 - The EU intends to restrict the use of critical fuels in space propulsion systems. These propellants like hydrazine are chemically aggressive, toxic and carcinogenic. Space propulsion of the future should be environmentally friendly, inexpensive, and easy to handle. Aschaffenburg University and DLR are currently developing environmentally friendly technologies for future satellite engines. Thereby rocket-grade hydrogen peroxide, which is foreseen as a substitute, is converted to uncritical water vapour and oxygen by an exothermic catalytic reaction on nanostructured iridium layers. The resulting hot gases provide the required amount of thrust. The iridium catalyst layers are coated onto ceramic pellets, using RF magnetron sputtering technology. The catalytic functionality was tested afterwards at the chemical laboratories of DLR. First experimental results show a significantly higher catalytic activity for nanostructured iridium surfaces than for smoother crystalline layers. N2 - Poster KW - satellite KW - propulsion KW - catalyst KW - iridium KW - hydrogen peroxide KW - Iridium KW - Katalysator KW - Satellitentechnik Y1 - 2021 VL - 2021 ER - TY - CHAP A1 - Lamotte, Julia T1 - Test 3 für Forschungsschwerpunkte Y1 - 2021 ER - TY - BOOK A1 - Bruhn, Heike T1 - Test 2 für Forschungsschwerpunkte Y1 - 2021 ER - TY - RPRT A1 - Keerl, Cornelia T1 - Test 1 für Forschungsschwerpunkte Y1 - 2021 ER - TY - BOOK A1 - Schildbach, Thomas A1 - Feldhoff, Patricia R. T1 - Der Konzernabschluss nach HGB und IFRS KW - Deutschland KW - Konzernabschluss KW - Deutschland Handelsgesetzbuch KW - International Financial Reporting Standards KW - Generally Accepted Accounting Principles Y1 - 2018 SN - 978-3-11-053539-6 U6 - https://doi.org/10.1515/9783110535723 PB - De Gruyter Oldenbourg CY - Berlin/Boston ER - TY - RPRT A1 - Feldhoff, Charlotte H. A1 - Liu, Yi A1 - Feldhoff, Patricia R. T1 - Does Microfinance have an impact on borrower’s consumption patterns and women’s empowerment? T2 - Weidener Diskussionspapiere Nr. 67 N2 - This paper conducts a thorough data analysis using cross-sectional data from a study carried out in Mexico including over 16,500 observations. In the study, clusters were selected in areas Compartamos Banco, a Microfinance institution (MFI), has not lent in before. The clusters were randomly assigned to either the treatment or the control group. The analysis suggests that Microfinance has a significant positive effect on school and food expenditure but no apparent effect on entrepreneurship. Using regression analysis, a significant positive effect on women’s empowerment and its positive effect on total consumption is found. KW - Mikrofinanzierung KW - Verbraucherverhalten KW - Frau KW - microfinance KW - consumption patterns KW - women’s empowerment KW - Mexico KW - Mexiko Y1 - 2019 ER - TY - CHAP A1 - Fehrenbacher, Dennis A1 - Rötzel, Peter A1 - Choo, Kim-Kwang Raymond T1 - Sentiment Analysis of Cyber-Attack Incident Reports T2 - ICIS 2021 N2 - This article examines sentiment of 12,821 reports on cyber-attacks on firms around the world from 2011 to mid-year 2019. With theworld wide web (www) and associated technologies connecting opinions worldwide, sentiment in the world wide web is an importantperspective to understanding developments in cyber-attacks and the public opinion thereof, because much of the public debate isshared online. Such sentiment can potentially explain developments in regulation and may be indirectly associated with the buildingof defense mechanisms of cyber-victims. Results show that the quantity of reports on cyber-attacks on firms has been increasing,but the sentiment of reports on cyber-attacks has been decreasing. Both trends reflect the increasing severity of the issue and arelikely contributing to regulatory responses. Results also show that the sentiment is conditional to the source that reports the cyber-attack. KW - Cyber Risk KW - Natural Language Processing KW - Information Systems KW - Cyber Security KW - Cyberattacke KW - Unternehmen KW - Computersicherheit Y1 - 2021 VL - 2021 ER - TY - RPRT A1 - Weithmann, Sabrina A1 - Fremery, Vincent T1 - China revolutioniert den Finanzsektor KW - Finanzen KW - China KW - Kapitalmarkt KW - Finanzwirtschaft Y1 - 2020 ER - TY - RPRT A1 - Weithmann, Sabrina T1 - Exportschlager chinesische Normen? KW - Export KW - China KW - China KW - Normung Y1 - 2018 ER - TY - RPRT A1 - Weithmann, Sabrina T1 - Marktführer der „neuen“ Arbeitskräfte – Chinesische Industrie- und Servicerobotik KW - Robotik KW - China KW - China KW - Robotik Y1 - 2019 ER - TY - JOUR A1 - Weithmann, Sabrina T1 - Standardization in China: Electric Vehicle Technology as Driver for Change in China’s Automotive Standardization JF - International Journal of Standardization Research (IJSR) N2 - Electric vehicle (EV) development in China emerged with the 863 program (1986) for high technologies and has received support since the 10th Five Year Plan. While standards were of no particular importance in the early years of EV development, standards have increasingly become subject to policies and programs. For instance, the promotion of ‘indigenous' or ‘home-grown' innovation is perceived as means to develop domestic standards and contribute to international standards. Alongside this target, the Chinese government mandated the development of an EV standardization roadmap to serve as a guideline for optimizing standardization work, promoting technical innovation and large-scale industrialization. It was even considered that EV standardization was a novel standard field that has the potential to secure China a forerunner position in technological development as well as international standardization, regardless of standard-setting practices in the conventional automotive sector. Against this background, this paper examines the differences in system set-up and processes of standardization for the traditional automotive and the electric vehicles sector. While conventional automotive standardization is limited to a single sector with the Ministry of Industry of Information Technology and the China Automotive Technology and Research Centre in charge, electric vehicles require the participation of stakeholders from other sectors. Therefore, the negative influence from the conventional decentralized automotive sector on the development of common nationwide standards like the dynamics between national, regional and local actors cannot be deprived. Additionally, this paper also highlights learnings from EV standardization that might set positive impulses for conventional EV standardizations. KW - China KW - Standardization KW - electric vehicles KW - China KW - Elektrofahrzeug KW - Standardisierung Y1 - 2016 VL - 2016 IS - 14 (2) SP - 20 EP - 32 ER - TY - CHAP A1 - Weithmann, Sabrina A1 - Schmack, Ulrich T1 - Benefits of e-mobility for cross-sector energy management BT - Mobilitätswandel konsequent entwickeln - 2. Internationale ATZ-Fachtagung T2 - Netzintegration der Elektromobilität 2017 KW - Elektromobilität KW - Energiemanagement KW - Elektromobilität KW - Energiemanagement Y1 - 2017 UR - https://www.springerprofessional.de/benefits-of-e-mobility-for-cross-sector-energy-management/15036976 SN - 978-3-658-19292-1 SP - 97 EP - 108 PB - Springer ER - TY - CHAP A1 - Weithmann, Sabrina T1 - The impact of China’s changing role in technology standardization BT - Wege zusammenführen 3. Internationale ATZ-Fachtagung T2 - Netzintegration der Elektromobilität 2018 N2 - China is taking on a new role in international trade. One of the most prominent events highlighting this new role has been the speech of Xi Jinping, the president of the Peoples Republic in China (PRC), at the World Economic Forum (WEF) in 2017. His speech has become famous as pro-globalization speech. It contrasted with the anti-globalization tendency proclaimed throughout the US president’s election campaign, who had assumed office shortly after the speech at the 2017 WEF. KW - Electromobility KW - Standardization KW - China KW - Elektromobilität KW - Standardisierung Y1 - 2018 UR - https://link.springer.com/chapter/10.1007/978-3-658-23393-8_2 SP - 9 EP - 18 PB - Springer ER - TY - BOOK A1 - Weithmann, Sabrina T1 - The Evolvement of Standards in China – Insight from the Electric Vehicle Sectors N2 - This book analyses why Chinese technology standards deviate from international standards. The research it contains is based on four periods of field research in Beijing that involved 70 expert interviews. The data gathered throughout these interviews resulted in a detailed case study on the Chinese standardisation system and particularly the electric vehicle sector. The book’s application of complexity theory shows that the evolvement of deviating standards is a substantial component in the development of the Chinese standardisation system. This is further explained by its use of a ‘Three Phase Standardisation Development Concept’. This book fills a gap in existing research, especially because it focuses on a developing country with a standardisation system that is in transition. KW - China KW - Standardization KW - Normung KW - China KW - Elektrofahrzeug KW - Standardisierung Y1 - 2018 SN - 978-3-8452-8623-5 PB - Nomos CY - Wiesbaden ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stritzelberger, Carolyn A1 - Mues, Kristin A1 - Schäfer, Kerstin A1 - Rosendahl, Wilfried A1 - Busch, Uwe T1 - Celebrating the Röntgen anniversary year: pupil experiments at Aschaffenburg University T2 - SPIE Proceedings N2 - On November 8th, 1895, Professor Wilhelm Conrad Röntgen was still working late on cathode rays in his laboratory at the University of Würzburg in Germany. By chance, he found a new type of radiation that was able to penetrate materials. He himself called them X-rays. In his honour, in Germany we call this type of radiation Röntgen´s rays since 1896. In 2020, Germany was celebrating the Röntgen anniversary year, recognizing the discovery of X-rays 125 years ago and the 175th birthday of its discoverer Wilhelm Conrad Röntgen, the first Nobel laureate in physics. Financed by a grant from the Klaus Tschira Foundation, the Reiss-Engelhorn-Museums in Mannheim and the German Röntgen Museum in Remscheid developed an “X-periments mobile” with interactive experiments for children and young people. Following the given motto "X-periments - making the invisible visible", this research station with optical experiments started traveling across Germany in the anniversary year and, due to the corona pandemic in the following year. In summer 2021, the “X-periments mobile” will make a guest appearance at Aschaffenburg University. The experimental set-ups enable school classes and students to gain an overview of optical technologies from infrared light to ultraviolet radiation to X-rays and gamma rays. The aim of the campaign is to inspire the young generation and to attract students for courses in science and technology. This contribution presents the historical discovery of X-rays, the “X-periments mobile” and its experiments, its intention, and the experiences from its stays at different places across Germany. KW - x-ray KW - Röntgen KW - education KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Jubiläum KW - Schülerversuch Y1 - 2021 UR - https://doi.org/10.1117/12.2589142 U6 - https://doi.org/https://doi.org/10.1117/12.2589142 VL - 2021 IS - 11776 SP - 117760E-1 EP - 117760E-10 PB - SPIE ER - TY - CHAP A1 - Graessler, Iris A1 - Dattner, Michael A1 - Bothen, Martin T1 - Main Feature List as core success criteria of organizing Requirements Elicitation T2 - R&D Management Conference, Milan, Italy 30. Juni - 4. Juli 2018 N2 - Innovation process and innovation output is positively affected by adequate reference models and supporting means. For this reason, a New V-Model for mechatronic and smart systems has been worked out by the Technical Committee VDI GMA 4.10 "Interdisciplinary Product Creation". Thus, the directive VDI 2206 "Development methodology for mechatronic systems" from the year 2004 (VDI 2206 2004) is being revised and adapted to the actual trend towards digital transformation of technical systems, business models and ecosystems. The core of the guideline is the V-Model describing mechatronic engineering (VDI 2206 2004). One core success criterium of organizing Requirements Elicitation is the established main feature list first published by Pahl and Beitz (Pahl et al. 1996). Based on this, a new Main Feature List enhanced for the usage in requirements elicitation of mechatronic and smart products is proposed. This Enhanced Main Feature List comprises additional requirements such as sampling rate, bus system, big data usage and fosters result quality and efficiency of requirements elicitation. This was proven and validated by applying it to Inline spectral measurement systems in the printing industry. The proposed Enhanced Main Feature List establishes new fundamentals in research and theory. KW - Mechatronik KW - Systementwicklung Y1 - 2018 ER - TY - CHAP A1 - Bothen, Martin A1 - Blumör, Alexander A1 - Pregitzer, Gerhard ED - Schulze, Sven-Olaf ED - Tschirner, Christian ED - Kaffenberger, Rüdiger ED - Ackva, Sascha T1 - Werkzeuge für die Entwicklung mechatronischer Systeme mit Methoden des MBSE BT - Paderborn, 08. – 10. November 2017 T2 - Tag des Systems Engineering N2 - Die Entwicklungsmethodik für mechatronische Systeme benötigt eine sehr gute Integrationsfähigkeit der verwendeten (Software-) Werkzeuge für den Systementwurf, den domänenspezifischen Entwurf, sowie für die Systemintegration. Hierzu wurden verschiedene Werkzeuge untersucht, die eine Abbildung des Model Based Systems Engineering (MBSE) ermöglichen. Insbesondere Werkzeugumgebungen für integriertes und föderiertes MBSE wurden untersucht. Ein Hauptaugenmerk wurde auf die Integration der Simulation in Verknüpfung mit SysML oder ähnlichen Modellen gelegt. Zu diesem Zweck wurde ein Referenzsystem mit verschiedenen Werkzeugen virtuell aufgebaut und der Umfang der Werkzeuge bewertet. Zum Aufbau des Referenzsystems wurde grundlegend mit dem RFLP-Ansatz und der FAS-Methode vorgegangen. Ferner wurde untersucht, ob die vorliegenden Methoden ausreichend sind, um MBSE mit den Werkzeugen zu betreiben. Die Arbeit zeigt, dass die Methoden im Umfeld des MBSE noch weiter ausgearbeitet werden müssen. KW - Mechatronik KW - Systementwicklung Y1 - 2017 SN - 978-3-446-45538-2 SP - 193 EP - 202 PB - Hanser ER - TY - JOUR A1 - Smeets, Mario A1 - Ostendorf, Ralf A1 - Rötzel, Peter T1 - AI and its Opportunities for Decision Making in an Organizational Context: A Systematic Review of the Influencing Factors on the Intention to use AI JF - Die Unternehmung – Swiss Journal of Business Research and Practice N2 - One domain of application of artificial intelligence (AI) is decision support, particularly in management. Although there are already research streams examining the interaction of AI and humans (e.g. the stream on "hybrid intelligence"), there are still numerous open research gaps – for example, a comprehensive overview of which factors favor the intention to use AI is missing. By conducting a systematic literature review, we identify the factors that potentially positively influence AI usage intentions for decision-making processes in organizations. From this, we create a framework that both provides practical implications for the successful use of AI in organizational decision-making processes and delivers further research approaches, for example, on the validity/ usability of proven IS adoption models in the present context. KW - Artificial Intelligence KW - Decision-making KW - Management Control KW - information systems KW - information management KW - Künstliche Intelligenz KW - Entscheidungsfindung KW - Management Y1 - 2021 VL - 2021 IS - OnlineFirst SP - 1 EP - 28 ER - TY - CHAP A1 - Voigt, Jorrit A1 - Möckel, Michael ED - Chinesta, R. ED - Abgrall, R. ED - Allix, O. ED - Kaliske, M. T1 - Comparing principal component analysis (PCA) and 𝛃-variational autoencoder(𝛃-VAE)for anomaly detection in selective laser melting (SLM) process data T2 - 14th WCCM-ECCOMAS Congress 2020, virtual congress, January, 11-15, 2021 N2 - The usability of machine learning approaches for the development of in-situ process monitoring, automated anomaly detection and quality assurance for the selective laser melting (SLM) process receives currently increasing attention. For a given set of real machine data we compare two established methods, principal component analysis (PCA) and -variational autoencoder (-VAE), for their applicability in exploratory data analysis and anomaly detection. We introduce a PCA-based unsupervised feature extraction algorithm, which allows for root cause analysis of process anomalies. The -VAE enables a slightly more compact dimensionality reduction; we consider it an option for automated process monitoring systems. KW - Anomaly detection KW - Process monitoring KW - additive manufacturing KW - Selektives Laserschmelzen KW - Anomalie Y1 - 2021 UR - https://www.scipedia.com/public/Voigt_Moeckel_2021a U6 - https://doi.org/10.23967/wccm-eccomas.2020.144 SP - 1 EP - 9 ER - TY - BOOK A1 - Borgeest, Kai T1 - Elektronik in der Fahrzeugtechnik N2 - Das Buch vermittelt die Grundlagen, um die Besonderheiten der Elektronik und Software im Kfz nicht nur zu kennen, sondern auch zu verstehen. Zusätzlich wird an Beispielen die Komplexität realer Systeme im Fahrzeug vorgeführt und gezeigt, welche Anwendungen durch die Elektronik erst möglich werden. Das Spannungsfeld zwischen Sicherheit, Zuverlässigkeit und Komplexität prägt in Verbindung mit branchenüblichen Abläufen das Vorgehen bei der Entwicklung, das ein in diesem Bereich tätiger Ingenieur verstehen muss. KW - Kraftfahrzeugelektronik KW - Kfz-Elektronik KW - Automobilelektronik KW - Steuergerät KW - Motorsteuerung KW - Fahrzeugtechnik Y1 - 2020 SN - 978-3-658-23663-2 U6 - https://doi.org/10.1007/978-3-658-23664-9 PB - Springer Vieweg CY - Wiesbaden ER - TY - CHAP A1 - Zindler, Klaus A1 - Sauer, Timm T1 - Self learning control for automatic track guidance T2 - Proceedings of International Research Days KW - automatic track guidance KW - self learning control KW - Artificial Intelligence KW - automated vehicle guidance KW - Autonomes Fahrzeug Y1 - 2021 VL - 2021 SP - 64 EP - 64 ER - TY - CHAP A1 - Zindler, Klaus T1 - Welcome & Key Research Areas of Aschaffenburg University of Applied Sciences T2 - Proceedings of International Research Days KW - Key Research Areas KW - Hochschule Aschaffenburg KW - Forschung Y1 - 2021 ER - TY - GEN A1 - Zindler, Klaus T1 - Wohin steuert das automatisierte Fahren? N2 - Vortrag KW - Autonomes Fahren KW - Autonomes Fahrzeug Y1 - 2018 ER - TY - JOUR A1 - Zindler, Klaus A1 - Doll, Konrad A1 - Huber, Bertold ED - WILEY-VCH, Verlag T1 - Sicher unterwegs - Fortschritte beim aktiven Fußgängerschutz JF - messtec drives Automation KW - aktiver Fußgängerschutz, automatische Brems- und Ausweichmanöver KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2017 UR - https://www.wileyindustrynews.com/restricted-files/161702 VL - 25 IS - 03 SP - 82 EP - 82 ER - TY - JOUR A1 - Döhring, Thorsten ED - IHK Aschaffenburg, T1 - Forscher entwickeln umweltfreundliche Satellitenantriebe JF - Wirtschaft am Bayerischen Untermain N2 - In der aktuellen Förderrunde des vom Bayerischen Staatsministeriums für Wissenschaft und Kunst aufgesetzten „Programms zur Förderung der angewandten Forschung und Entwicklung an Hochschulen für angewandte Wissenschaften – Fachhochschulen“ war die Technische Hochschule Aschaffenburg sehr erfolgreich. Für das Technologieprojekt ACCASI („Aschaffenburg Competence Center for Astronomical and Space Instrumentation“) erhält sie über eine Laufzeit von drei Jahren insgesamt 250.000 Euro. KW - Satellit KW - Triebwerk KW - Iridium KW - Katalysator KW - Satellitentechnik Y1 - 2021 UR - https://www.aschaffenburg.ihk.de/share/flipping-book/5064860/flippingbook.pdf VL - 2021 IS - März SP - 12 EP - 13 ER - TY - CHAP A1 - Angress, Alexandra A1 - Krauße, Sylvana T1 - The ulture factor: Lessons from a contribution to coil: Social interaction in COVID-19 times – a German university perspective T2 - Intercultural Competence at Work KW - Hochschulunterricht KW - Internationalisierung KW - COVID-19 Y1 - 2020 UR - https://www.theseus.fi/handle/10024/354179 SP - 36 EP - 54 PB - Publications of Seinäjoki University of Applied Sciences CY - Seinäjoki ER - TY - THES A1 - Staudt, Stefan T1 - Optimierter sensorloser Betrieb von Synchron-Reluktanzmaschinen in Nutzfahrzeugen KW - Nutzfahrzeug KW - Reluktanzmotor KW - Drehstrommaschine Y1 - 2020 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Vorbehaltsnießbrauch an GmbH-Anteilen: Gestaltungsempfehlungen in der Praxis JF - Erbfolgebesteuerung N2 - Der Nießbrauch an GmbH-Beteiligungen ist eine in der Praxis beliebte Gestaltungsform, die regelmäßig eine flexible Zuweisung von Vermögenssubstanz auf der einen und den daraus fließenden Erträgen auf der anderen Seite ermöglicht. Ja nach Zielsetzung werden unterschiedliche Nießbrauchsmodelle gewählt. Der Vorbehaltsnießbrauch wird häufig zur Gestaltung der Unternehmensnachfolge genutzt, während der Zuwendungsnießbrauch auf die Versorgung von Angehörigen im Rahmen der vorweggenommenen Erbfolge abzielt. Dieser Beitrag beschäftigt sich mit der Variante 1. In einem Folgebeitrag wird der Zuwendungsnießbrauch als Gestaltungsmodell auf den Prüfstand gestellt. KW - Vorbehaltsnießbrauch KW - GmbH KW - Gesellschaftsanteil KW - Nießbrauch KW - GmbH-Beteiligung KW - Unternehmensnachfolge KW - Gestaltungsempfehlungen KW - Zivilrecht KW - Einkommensteuerrecht KW - Schenkungsteuerrecht KW - Musterfall Y1 - 2021 VL - 2021 IS - 4 SP - 98 EP - 104 ER - TY - THES A1 - Putscher, Christian T1 - Drahtlose Energieübertragung für hohe Leistungen KW - Drahtlose Energieübertragung KW - Induktive Kopplung KW - Magnetischer Fluss KW - Leistungselektronik Y1 - 2020 SN - 978-3-8440-7563-2 PB - Shake ER - TY - THES A1 - Girschikofsky, Maiko T1 - Herstellung und Anwendung planarer Bragg-Gitter-Sensoren KW - Bragg-Reflektor KW - Optischer Sensor KW - Integrierter Sensor Y1 - 2020 SN - 978-3-8440-7561-8 PB - Shaker ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - Validated Undergraduates’ Misconceptions about Software Engineering T2 - Global Engineering Education Conference (EDUCON) KW - Software Engineering Y1 - 2021 PB - IEEE ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Borgeest, Kai T1 - Teaching Generic Competences in Software Engineering via E-Learning – An Evaluation T2 - International Conference on Teaching, Assessment and Learning for Engineering (TALE) KW - E-Learning KW - Software Engineering Y1 - 2020 SP - 311 EP - 316 PB - IEEE ER -