TY - JOUR A1 - Engelmann, Ulrich M. A1 - Buhl, Eva Miriam A1 - Draack, Sebastian A1 - Viereck, Thilo A1 - Frank, A1 - Schmitz-Rode, Thomas A1 - Slabu, Ioana T1 - Magnetic relaxation of agglomerated and immobilized iron oxide nanoparticles for hyperthermia and imaging applications JF - IEEE Magnetic Letters N2 - Magnetic nanoparticles (MNPs) are used as therapeutic and diagnostic agents for local delivery of heat and image contrast enhancement in diseased tissue. Besides magnetization, the most important parameter that determines their performance for these applications is their magnetic relaxation, which can be affected when MNPs immobilize and agglomerate inside tissues. In this letter, we investigate different MNP agglomeration states for their magnetic relaxation properties under excitation in alternating fields and relate this to their heating efficiency and imaging properties. With focus on magnetic fluid hyperthermia, two different trends in MNP heating efficiency are measured: an increase by up to 23% for agglomerated MNP in suspension and a decrease by up to 28% for mixed states of agglomerated and immobilized MNP, which indicates that immobilization is the dominant effect. The same comparatively moderate effects are obtained for the signal amplitude in magnetic particle spectroscopy. Y1 - 2018 U6 - https://doi.org/10.1109/LMAG.2018.2879034 SN - 1949-307X VL - 9 IS - Article number 8519617 PB - IEEE CY - New York, NY ER - TY - JOUR A1 - Engelmann, Ulrich M. A1 - Buhl, Eva Miriam A1 - Baumann, Martin A1 - Schmitz-Rode, Thomas A1 - Slabu, Ioana T1 - Agglomeration of magnetic nanoparticles and its effects on magnetic hyperthermia JF - Current Directions in Biomedical Engineering Y1 - 2017 U6 - https://doi.org/10.1515/cdbme-2017-0096 SN - 2364-5504 VL - 3 IS - 2 SP - 457 EP - 460 PB - De Gruyter CY - Berlin ER - TY - JOUR A1 - Engel, Mareike A1 - Holtmann, Dirk A1 - Ulber, Roland A1 - Tippkötter, Nils T1 - Increased Biobutanol Production by Mediator‐Less Electro‐Fermentation JF - Biotechnology Journal N2 - A future bio-economy should not only be based on renewable raw materials but also in the raise of carbon yields of existing production routes. Microbial electrochemical technologies are gaining increased attention for this purpose. In this study, the electro-fermentative production of biobutanol with C. acetobutylicum without the use of exogenous mediators is investigated regarding the medium composition and the reactor design. It is shown that the use of an optimized synthetic culture medium allows higher product concentrations, increased biofilm formation, and higher conductivities compared to a synthetic medium supplemented with yeast extract. Moreover, the optimization of the reactor system results in a doubling of the maximum product concentrations for fermentation products. When a working electrode is polarized at −600 mV vs. Ag/AgCl, a shift from butyrate to acetone and butanol production is induced. This leads to an increased final solvent yield of Yᴀᴃᴇ = 0.202 gg⁻¹ (control 0.103 gg⁻¹), which is also reflected in a higher carbon efficiency of 37.6% compared to 23.3% (control) as well as a fourfold decrease in simplified E-factor to 0.43. The results are promising for further development of biobutanol production in bioelectrochemical systems in order to fulfil the principles of Green Chemistry. Y1 - 2018 U6 - https://doi.org/10.1002/biot.201800514 SN - 1860-7314 VL - 14 IS - 4 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Engel, Mareike A1 - Gemünde, Andre A1 - Holtmann, Dirk A1 - Müller-Renno, Christine A1 - Ziegler, Christiane A1 - Tippkötter, Nils A1 - Ulber, Roland T1 - Clostridium acetobutylicum’s connecting world: cell appendage formation in bioelectrochemical systems JF - ChemElectroChem N2 - Bacterial cell appendix formation supports cell-cell interaction, cell adhesion and cell movement. Additionally, in bioelectrochemical systems (BES), cell appendages have been shown to participate in extracellular electron transfer. In this work, the cell appendix formation of Clostridium acetobutylicum in biofilms of a BES are imaged and compared with conventional biofilms. Under all observed conditions, the cells possess filamentous appendages with a higher number and density in the BES. Differences in the amount of extracellular polymeric substance in the biofilms of the electrodes lead to the conclusion that the cathode can be used as electron donor and the anode as electron acceptor by C. acetobutylicum. When using conductive atomic force microscopy, a current response of about 15 nA is found for the cell appendages from the BES. This is the first report of conductivity for clostridial cell appendices and represents the basis for further studies on their role for biofilm formation and electron transfer. Y1 - 2019 U6 - https://doi.org/10.1002/celc.201901656 SN - 2196-0216 VL - 7 IS - 2 SP - 414 EP - 420 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Engel, Mareike A1 - Bayer, Hendrik A1 - Holtmann, Dirk A1 - Tippkötter, Nils A1 - Ulber, Roland T1 - Flavin secretion of Clostridium acetobutylicum in a bioelectrochemical system - Is an iron limitation involved? JF - Bioelectrochemistry Y1 - 2019 U6 - https://doi.org/10.1016/j.bioelechem.2019.05.014 SN - 1567-5394 IS - In Press, Accepted Manuscript PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Emons, H. A1 - Hüllenkremer, B. A1 - Schöning, Michael Josef T1 - Detection of metal ions in aqueous solutions by voltohmmetry JF - Fresenius' Journal of Analytical Chemistry. 369 (2001), H. 1 Y1 - 2001 SN - 0937-0633 SP - 42 EP - 46 ER - TY - JOUR A1 - Emons, H. A1 - Glück, O. A1 - Schöning, Michael Josef T1 - Voltohmmetry – An alternative detection principle at ultrathin metal electrodes in solution JF - Chemical and biological sensors and analytical methods : proceedings of the international symposium / Sensor, Physical Electrochemistry, and Organic and Biological Electrochemistry Divisions. Ed.: M. Butler Y1 - 2001 SN - 1-56677-351-2 N1 - International Symposium: Chemical and Biological Sensors and Analytical Methods ; (2 : 2001.) SP - 1 EP - 3 PB - Electrochemical Society CY - Pennington, NJ ER - TY - JOUR A1 - Emons, H. A1 - Glück, O. A1 - Hüllenkremer, B. A1 - Schöning, Michael Josef T1 - Voltohmmetry as an alternative detection method at polycrystalline metal film electrodes JF - Electroanalysis. 13 (2001), H. 8-9 Y1 - 2001 SN - 1040-0397 SP - 677 EP - 680 ER - TY - JOUR A1 - Emons, H. A1 - Baade, A. A1 - Schöning, Michael Josef T1 - Voltammetric determination of heavy metals in microvolumes of rain water JF - Electroanalysis. 12 (2000), H. 15 Y1 - 2000 SN - 1040-0397 SP - 1171 EP - 1176 ER - TY - JOUR A1 - Emig, J. A1 - Hebel, Christoph A1 - Schwark, A. T1 - Einsatzbereiche für Verkehrsnachfragemodelle JF - Straßenverkehrstechnik N2 - In der Praxis bestehen vielfältige Einsatzbereiche für Verkehrsnachfragemodelle. Mit ihnen können Kenngrößen des Verkehrsangebots und der Verkehrsnachfrage für den heutigen Zustand wie auch für zukünftige Zustände bereitgestellt werden, um so die Grundlagen für verkehrsplanerische Entscheidungen zu liefern. Die neuen „Empfehlungen zum Einsatz von Verkehrsnachfragemodellen für den Personenverkehr“ (EVNM-PV) (FGSV 2022) veranschaulichen anhand von typischen Planungsaufgaben, welche differenzierten Anforderungen daraus für die Modellkonzeption und -erstellung resultieren. Vor dem Hintergrund der konkreten Aufgabenstellung sowie deren spezifischer planerischer Anforderungen bildet die abzuleitende Modellspezifikation die verabredete Grundlage zwischen Auftraggeber und Modellersteller für die konkrete inhaltliche, fachliche Ausgestaltung des Verkehrsmodells. Y1 - 2022 U6 - https://doi.org/10.53184/SVT10-2022-2 SN - 0039-2219 VL - 66 IS - 10 SP - 727 EP - 736 PB - Kirschbaum Verlag GmbH CY - Bonn ER - TY - JOUR A1 - Emhardt, Selina N. A1 - Jarodzka, Halszka A1 - Brand-Gruwel, Saskia A1 - Drumm, Christian A1 - Niehorster, Diederick C. A1 - van Gog, Tamara T1 - What is my teacher talking about? Effects of displaying the teacher’s gaze and mouse cursor cues in video lectures on students’ learning JF - Journal of Cognitive Psychology N2 - Eye movement modelling examples (EMME) are instructional videos that display a teacher’s eye movements as “gaze cursor” (e.g. a moving dot) superimposed on the learning task. This study investigated if previous findings on the beneficial effects of EMME would extend to online lecture videos and compared the effects of displaying the teacher’s gaze cursor with displaying the more traditional mouse cursor as a tool to guide learners’ attention. Novices (N = 124) studied a pre-recorded video lecture on how to model business processes in a 2 (mouse cursor absent/present) × 2 (gaze cursor absent/present) between-subjects design. Unexpectedly, we did not find significant effects of the presence of gaze or mouse cursors on mental effort and learning. However, participants who watched videos with the gaze cursor found it easier to follow the teacher. Overall, participants responded positively to the gaze cursor, especially when the mouse cursor was not displayed in the video. KW - Instructional design KW - eye movement modelling examples KW - video learning Y1 - 2022 U6 - https://doi.org/10.1080/20445911.2022.2080831 SN - 2044-5911 SP - 1 EP - 19 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Emhardt, Selina A1 - Jarodzka, Halszka A1 - Brand-Gruwel, Saskia A1 - Drumm, Christian A1 - Gog, Tamara van T1 - Introducing eye movement modeling examples for programming education and the role of teacher's didactic guidance JF - ETRA '20 Short Papers: ACM Symposium on Eye Tracking Research and Applications N2 - In this article, we introduce how eye-tracking technology might become a promising tool to teach programming skills, such as debugging with ‘Eye Movement Modeling Examples’ (EMME). EMME are tutorial videos that visualize an expert's (e.g., a programming teacher's) eye movements during task performance to guide students’ attention, e.g., as a moving dot or circle. We first introduce the general idea behind the EMME method and present studies that showed first promising results regarding the benefits of EMME to support programming education. However, we argue that the instructional design of EMME varies notably across them, as evidence-based guidelines on how to create effective EMME are often lacking. As an example, we present our ongoing research on the effects of different ways to instruct the EMME model prior to video creation. Finally, we highlight open questions for future investigations that could help improving the design of EMME for (programming) education. Y1 - 2020 U6 - https://doi.org/10.1145/3379156.3391978 IS - Art. 52 SP - 1 EP - 4 PB - ACM CY - New York ER - TY - JOUR A1 - Elsen, Ingo A1 - Kraiss, Karl-Friedrich A1 - Krumbiegel, Dirk A1 - Walter, Peter A1 - Wickel, Jochen T1 - Visual information retrieval for 3D product identification: a midterm report JF - KI - Künstliche Intelligenz Y1 - 1999 SN - 1610-1987 SN - 0933-1875 VL - 13 IS - 1 SP - 64 EP - 67 PB - Springer CY - Berlin ER - TY - JOUR A1 - Elsen, Ingo A1 - Kraiss, Karl-Friedrich T1 - System concept and realization of a scalable neurocomputing architecture JF - Systems Analysis Modelling Simulation N2 - This paper describes the realization of a novel neurocomputer which is based on the concepts of a coprocessor. In contrast to existing neurocomputers the main interest was the realization of a scalable, flexible system, which is capable of computing neural networks of arbitrary topology and scale, with full independence of special hardware from the software's point of view. On the other hand, computational power should be added, whenever needed and flexibly adapted to the requirements of the application. Hardware independence is achieved by a run time system which is capable of using all available computing power, including multiple host CPUs and an arbitrary number of neural coprocessors autonomously. The realization of arbitrary neural topologies is provided through the implementation of the elementary operations which can be found in most neural topologies. Y1 - 1999 SN - 0232-9298 SN - 1029-4902 VL - 35 IS - 4 SP - 399 EP - 419 PB - Gordon and Breach Science Publishers CY - Amsterdam ER - TY - JOUR A1 - Elsen, Ingo A1 - Hartung, Frank A1 - Horn, Uwe A1 - Kampmann, Markus A1 - Peters, Liliane ED - Voas, Jeffrey T1 - Streaming technology in 3G mobile communication systems JF - Computer : innovative technology for computer professionals N2 - Third-generation mobile communication systems will combine standardized streaming with a range of unique services to provide high-quality Internet content that meets the specific needs of the rapidly growing mobile market. Y1 - 2001 SN - 0018-9162 SN - 1558-0814 VL - 34 IS - 9 Seiten SP - 46 EP - 52 PB - IEEE CY - New York ER - TY - JOUR A1 - Ellrich, Thomas A1 - Lind, Thorsten Patric T1 - Die 'kalte Zwangsverwaltung' durch den Insolvenzverwalter JF - Forderungs-Praktiker : WIKI Y1 - 2012 IS - 1 SP - 16 EP - 21 PB - FCH CY - Heidelberg ER - TY - JOUR A1 - Ellerweg, Roland A1 - Ritz, Thomas A1 - Schuhmann, Stefan T1 - Anwendungsentwicklung für iPhone und Windows Mobile : ein bisschen von allem JF - iX : Magazin für professionelle Informationstechnik Y1 - 2009 SN - 0935-9680 (Print) SN - 1612-1392 (Online) IS - 3 SP - 132 EP - 135 ER - TY - JOUR A1 - Elbers, Gereon A1 - Zang, Thorsten A1 - Buck, Manfred T1 - Ruß-Immissionsmessungen im Einflußbereich des Kraftfahrzeugverkehrs JF - Staub, Reinhaltung der Luft : air quality control. 50 (1990) Y1 - 1990 SN - 0039-0771 SP - 93 ER - TY - JOUR A1 - Elbers, Gereon A1 - Thomzik, Manfred T1 - Das Entstehen geruchsintensiver schwefelhaltiger organischer Verbindungen in Lackierereien und Möglichkeiten zu deren Vermeidung JF - Aus der Tätigkeit der LIS / Landesanstalt für Immissionsschutz des Landes Nordrhein-Westfalen. 1989 (1990) Y1 - 1990 SN - 0931-5497 SP - 35 ER - TY - JOUR A1 - Elbers, Gereon A1 - Richter, J. T1 - Messung kraftfahrzeugbedingter Rußimmissionen JF - Staub, Reinhaltung der Luft : air quality control. 54 (1994) Y1 - 1994 SN - 0039-0771 SP - 19 ER -