@misc{MoellmannVollmer2014, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {The Basics Science and History of Thermal Imaging}, year = {2014}, language = {en} } @article{WangHarthPuzyrevetal.2022, author = {Wang, Jing and Harth, Kirsten and Puzyrev, Dmitry and Stannarius, Ralf}, title = {The effect of obstacles near a silo outlet on the discharge of soft spheres}, series = {New Journal of Physics}, volume = {24}, journal = {New Journal of Physics}, publisher = {IOP}, doi = {10.1088/1367-2630/ac8bea}, year = {2022}, language = {en} } @article{Vollmer2022, author = {Vollmer, Michael}, title = {The evolution of IR imaging: What's next?}, series = {Laser Focus World Magazine}, journal = {Laser Focus World Magazine}, publisher = {endeavor business media}, pages = {23 -- 26}, year = {2022}, abstract = {The vast majority of all human sensory inputs occur through our eyes. Light from direct sources or scattered light from objects enters our eyes and is focused onto the retina. The resulting signals are interpreted by the brain, which leads to the perception of the image of the observed objects. Although quite efficient for our daily life, many technological applications require sensor properties beyond the characteristics of our eyes. A major limitation regarding microscopic objects is spatial resolution, which is overcome by microscopes. Time resolution can be dealt with using either time-lapse or high-speed cameras. Finally, eyes only detect visible radiation within the wavelength range from about 380 nm to 780 nm. Changing the detected spectral range of electromagnetic radiation can dramatically enhance our vision. Shorter wavelengths such as x-rays are valuable tools for medical imaging, while ultraviolet (UV) imaging is used for forensics. Longer-wavelength thermal radiation used for imaging is often defined within spectral ranges, characterized by the photoelectric detector materials used and the respective atmospheric windows.}, language = {de} } @article{AmanAmanHintzetal.2017, author = {Aman, Sergej and Aman, Alexander and Hintz, Werner and Tr{\"u}e, Michael and Veit, Peter and Hirsch, S{\"o}ren}, title = {The Exfoliation of Graphite Particles in the Vibratory Disk Mill}, series = {Chemie Ingenieur Technik}, volume = {89}, journal = {Chemie Ingenieur Technik}, number = {9}, doi = {10.1002/cite.201600124}, pages = {1185 -- 1191}, year = {2017}, language = {en} } @article{Vollmer2019, author = {Vollmer, Michael}, title = {The freezing of lakes in winter}, series = {European Journal of Physics}, journal = {European Journal of Physics}, number = {Ausgabe: 3/ Band: 40}, publisher = {IOP Publishing}, issn = {1367-2630}, doi = {10.1088/1361-6404/ab07f8}, year = {2019}, abstract = {Freezing of lakes is described using a simplified one-dimensional model, which gives ice thickness, ice growth rates, and ice surface temperature as a function of time. Model data for a specific lake with known meteorological conditions are compared to estimated ice thickness using a simple optical method. Finally, more advanced potential students projects are briefly discussed and results of a numerical solution are compared to the simplified model.}, language = {en} } @inproceedings{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {The magic of the invisible: using IR imaging in physics education}, series = {In: InfraMation proceedings / Infrared Training Center. - Vol. 14 (2013)}, booktitle = {In: InfraMation proceedings / Infrared Training Center. - Vol. 14 (2013)}, year = {2013}, language = {en} } @misc{Vollmer2013, author = {Vollmer, Michael}, title = {The magic of the invisible: using IR imaging in physics education}, year = {2013}, language = {en} } @article{VollmerMoellmannShaw2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Shaw, Joseph A.}, title = {The optics and physics of near infrared imaging}, series = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97930Z (October 8, 2015)}, journal = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97930Z (October 8, 2015)}, doi = {10.1117/12.2223094}, year = {2015}, abstract = {abstract A large part of photonics research and development, as well as commercial applications such as optical data transmission or infrared thermal imaging, occurs in the infrared spectral range between 0.8 μm and 15 μm. However, relatively little material is so far available for experimentally teaching the physics and optics of this spectral range. We report a respective new approach in the near infrared (NIR) range between 0.8 μm and 1.7 μm that allows visualization of a number of fascinating physics phenomena. First, we use the near-infrared sensitivity of silicon-based detectors in rather inexpensive video cameras and digital single-lens reflex cameras by removing the infrared-blocking filter and replacing it with a visible-radiation blocking filter. Second, we utilize modern NIR cameras based on InGaAs detectors. With both camera types we illustrate and explain a number of physics concepts that are especially suitable for curricula in optics and photonics. Examples include the strangely bright appearance of vegetation, contrast enhancement between clouds and sky, the initially surprising differences of optical material properties between the VIS and NIR range, the possibilities of visualizing buried hidden structures and texts, and recent medical applications to locate blood vessels below the skin. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.}, language = {en} } @article{LachowskiHammermeisterHalenzetal.2023, author = {Lachowski, Krzysztof and Hammermeister, Florian and Halenz, Bastian and Lieckefett, Florian and G{\"o}tze, Thomas and Prill, Robert and Becker, Roland}, title = {The Patellostabilometer: A New Device for Quantification of Mediolateral Patella Displacement}, series = {Sensors}, journal = {Sensors}, number = {23 (3)}, publisher = {MDPI}, doi = {https://doi.org/10.3390/s23031274}, year = {2023}, abstract = {Mediolateral patella displacement is of interest for diagnostics and clinically relevant research questions. Apart from manual testing, no standardized method is currently available. Proper quantification of patella mobility is necessary to better understand pathologies at the patellofemoral joint. Patella mobility was assessed in 25 healthy individuals using a Patellostabilometer, a new prototype instrument for quantification of the mediolateral patella displacement. The participants underwent measurements of the mediolateral displacement three times using the Patellostabilome- ter. A maximal force of 10 N was applied for patella movement. Additionally, leg length and circumference of the knee, upper- and lower-leg were measured. Lateral patella displacement of 18.27 ± 3.76 mm (range 15.85-20.64 mm, interquartile range (IQR) of 4.79) was measured. The medial patella displacement showed 24.47 ± 6.59 mm (range 19.29-29.76 mm, IQR of 10.47). The test-retest measurement error was 2.32 ± 1.76 mm (IQR of 2.38 mm), with five outliers. There was greater test-retest variability between the measurements of the medial displacement compared to the lateral one. The test-retest variability reached 7\% of the patella displacement. Other parameters provided no significant correlations. Based on the natural patellofemoral mobility, a precise and clinically relevant quantification of patella mobility is allowed.}, language = {en} } @article{MangoldShawVollmer2013, author = {Mangold, Klaus and Shaw, Joseph A. and Vollmer, Michael}, title = {The physics of near-infrared photography}, series = {In: European journal of physics 34 (2013) 6, S51-S71}, journal = {In: European journal of physics 34 (2013) 6, S51-S71}, doi = {doi:10.1088/0143-0807/34/6/S51}, pages = {S51 -- S71}, year = {2013}, abstract = {The physics behind the sometimes strange effects and 'unnatural' appearance of near-infrared (NIR) photographs is discussed in terms of reflection, absorption and transmission of NIR radiation with the respective objects. Besides discussing how NIR cameras work, several visible and NIR photograph pairs are presented, which include vegetation, natural water, clouds, the sky, and humans. In addition, some physics-oriented experimental NIR images are presented which clearly demonstrate some of the basic physics behind some of these awesome sights.}, language = {en} } @article{StannariusHarth2023, author = {Stannarius, Ralf and Harth, Kirsten}, title = {The structure of disintegrating defect clusters in smectic C freely suspended films}, series = {Soft Matter}, journal = {Soft Matter}, number = {19}, publisher = {Royal Society of Chemistry}, doi = {https://doi.org/10.1039/d3sm00808h}, pages = {6109 -- 6115}, year = {2023}, abstract = {Disclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenario including the emerging regular defect patterns must be selected by specific mechanisms. We analyze experimental data and compare them with a simple model where the defect clusters adiabatically pass quasi-equilibrium solutions in one-constant approximation. It is found that the defects arrange in geometrical patterns that correspond very closely to superimposed singular defect solutions, without additional director distortions. The patterns expand by affine transformations where all distances between individual defects scale with the same time-dependent scaling factor proportional to the square-root of time.}, language = {en} } @article{PlaninsicVollmer2008, author = {Planinsic, G. and Vollmer, Michael}, title = {The surface to volume ratio in thermal physics: from cheese cube physics to animal metabolism}, series = {In: European Journal of Physics 29 (2008), 369-384}, journal = {In: European Journal of Physics 29 (2008), 369-384}, issn = {0143-0807}, pages = {369 -- 384}, year = {2008}, language = {en} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {The tablecloth pull revisited}, series = {Physics Education 50 (2015) 3}, journal = {Physics Education 50 (2015) 3}, pages = {324 -- 328}, year = {2015}, abstract = {Abstract A very old and well-known magical trick is the so-called tablecloth pull. A table is covered with a tablecloth, on top of which are certain objects. The task is to remove the tablecloth while the objects—which must not be touched—stay on top of the table. This article describes the physics behind the experiment, and presents examples recorded with high-speed cameras.}, language = {en} } @misc{Moellmann2013, author = {M{\"o}llmann, Klaus-Peter}, title = {Theorie und Praxis der Strahlungsthermometrie}, year = {2013}, language = {de} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {There is more to see than eyes can detect}, year = {2002}, language = {en} } @article{KarstaedtMoellmannPinnoetal.2001, author = {Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {There is more to see than eyes can detect : visualization of energy transfer processes and the laws of radiation for physics education}, series = {In: The Physics Teacher 39 (2001), 371-376}, journal = {In: The Physics Teacher 39 (2001), 371-376}, pages = {371 -- 376}, year = {2001}, language = {en} } @article{KarstaedtMoellmannPinnoetal.2001, author = {Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {There is more to see than eyes can detect: visualization of energy transfer processes and the laws of radiation for physics education}, series = {In: The Physics Teacher 39 (2001), 371-376}, journal = {In: The Physics Teacher 39 (2001), 371-376}, pages = {371 -- 376}, year = {2001}, language = {en} } @inproceedings{MoellmannVollmer2012, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Thermal effects due to focused light from glass fronts}, series = {InfraMation proceedings. - Vol. 13 (2012)}, booktitle = {InfraMation proceedings. - Vol. 13 (2012)}, year = {2012}, language = {de} } @inproceedings{MoellmannKarstaedtPinnoetal.2006, author = {M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef and Pinno, Frank and Vollmer, Michael}, title = {Thermal image quality - Visualization of spatial and thermal resolution in thermal imaging}, series = {In: InfraMation proceedings Vol. 7 (2006), 79-92}, booktitle = {In: InfraMation proceedings Vol. 7 (2006), 79-92}, pages = {79 -- 92}, year = {2006}, language = {en} } @techreport{KueglerMoellerGoeckeetal.2015, author = {K{\"u}gler, H. and M{\"o}ller, F. and Goecke, Sven-Frithjof and Vollertsen, F.}, title = {Thermisches F{\"u}gen h{\"o}chstfester St{\"a}hle}, series = {Schweissen und Schneiden}, volume = {67}, journal = {Schweissen und Schneiden}, number = {12}, issn = {0036-7184}, pages = {744}, year = {2015}, language = {de} } @article{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Thermodynamics of gases: combustion processes, analyzed in slow motion}, series = {In: Physics Education 48 (2013) 1, 22-27}, journal = {In: Physics Education 48 (2013) 1, 22-27}, pages = {22 -- 27}, year = {2013}, language = {en} } @article{VollmerMoellmann2008, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Thermographie : Grundlagen, Forschung und moderne Anwendungen in Industrie und Technik}, series = {In: Praxis der Naturwissenschaften - Physik in der Schule 57 (2008) 8, 5-14}, journal = {In: Praxis der Naturwissenschaften - Physik in der Schule 57 (2008) 8, 5-14}, pages = {5 -- 14}, year = {2008}, language = {de} } @misc{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Thermographie im Physikunterricht}, year = {2013}, language = {de} } @inproceedings{MoellmannLutzVollmeretal.2004, author = {M{\"o}llmann, Klaus-Peter and Lutz, Norbert and Vollmer, Michael and Wille, Ch.}, title = {Thermography of Microsystems}, series = {In: InfraMation proceedings Vol. 5 (2004), 183-196}, booktitle = {In: InfraMation proceedings Vol. 5 (2004), 183-196}, pages = {183 -- 196}, year = {2004}, language = {en} } @misc{Vollmer2005, author = {Vollmer, Michael}, title = {Thermography of microwave ovens}, year = {2005}, language = {en} } @inproceedings{PinnoMoellmannVollmer2008, author = {Pinno, Frank and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Thermography of window panes - problems, possibilities and troubleshooting}, series = {In: InfraMation proceedings Vol. 9 (2008), 355-362}, booktitle = {In: InfraMation proceedings Vol. 9 (2008), 355-362}, pages = {355 -- 362}, year = {2008}, language = {en} } @article{VollmerMoellmann2017, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Thomsons fliegender Ring: altbekannt, doch trickreich}, series = {Physik in unserer Zeit}, volume = {48}, journal = {Physik in unserer Zeit}, number = {5}, doi = {10.1002/piuz.201701490}, pages = {251 -- 253}, year = {2017}, language = {de} } @article{OertelLiuZhouetal.2018, author = {Oertel, Christian and Liu, Zhe and Zhou, Fuqiang and Wei, Yintao}, title = {Three-dimensional vibration of a ring with a noncircular cross-section on an elastic foundation}, series = {Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science}, volume = {232}, journal = {Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science}, number = {13}, doi = {10.1177/0954406217720823}, pages = {2381 -- 2393}, year = {2018}, language = {en} } @inproceedings{MoellmannVollmerKarstaedt1999, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael and Karst{\"a}dt, Detlef}, title = {Tieftemperaturexperimente in der Experimentalphysikausbildung an Hochschulen: Experimente mit fl{\"u}ssigem Stickstoff in der Hochschullehre}, series = {In: Fr{\"u}hjahrstagung des Fachverbands Didaktik der Physik in der Deutschen Physikalischen Gesellschaft, Ludwigsburg 1999 ; zus{\"a}tzlich mit den Beitr{\"a}gen des Lehrertages und der Kunstausstellung bei der Fr{\"u}hjahrstagung 1999 des Arbeitskreises Festk{\"o}rperphysik in M{\"u}nster. - Berlin : Lehmann, 1999. - 1 CD-ROM. - ISBN 3-931253-41-4}, booktitle = {In: Fr{\"u}hjahrstagung des Fachverbands Didaktik der Physik in der Deutschen Physikalischen Gesellschaft, Ludwigsburg 1999 ; zus{\"a}tzlich mit den Beitr{\"a}gen des Lehrertages und der Kunstausstellung bei der Fr{\"u}hjahrstagung 1999 des Arbeitskreises Festk{\"o}rperphysik in M{\"u}nster. - Berlin : Lehmann, 1999. - 1 CD-ROM. - ISBN 3-931253-41-4}, year = {1999}, language = {de} } @article{VollmerMoellmann2018, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Time-lapse videos for physics education: specific examples}, series = {Physics Education}, volume = {53}, journal = {Physics Education}, number = {3}, doi = {10.1088/1361-6552/aab6cf}, pages = {033007 -- 033007}, year = {2018}, language = {en} } @article{OertelFandre2009, author = {Oertel, Christian and Fandre, A.}, title = {Tire Model RMOD-K 7 and Misuse Load Cases}, series = {In: SAE technical papers 2009-01-0582}, journal = {In: SAE technical papers 2009-01-0582}, year = {2009}, abstract = {Among load cases concerning vehicle suspension strength and durability, the misuse case is very special because of large obstacles. In this paper, an extension of the flexible belt model RMOD-K 7 concerning misuse situations is discussed. In normal rolling conditions, contact occurs between tire and road surface. To handle misuse deformations, the contact between the inner surface of the tire and the rim has to be dealt with. Results of the validation process are shown, leading to normal forces up to 70 [kN]. The model can be used together with mbs full vehicle models. One example is the determination of the critical test velocity, which generates the maximum of suspension stresses and can be found using RMOD-K 7.}, language = {en} } @article{OertelHempel2014, author = {Oertel, Christian and Hempel, J.}, title = {Tire Model Toolbox. University Focus}, series = {Tire technology international}, journal = {Tire technology international}, issn = {1462-4729}, pages = {62 -- 65}, year = {2014}, language = {en} } @incollection{RevinaRizunAksu2023, author = {Revina, Aleksandra and Rizun, Nina and Aksu, {\"U}nal}, title = {Towards a Framework for Context Awareness Based on Textual Process Data: Case Study Insights}, series = {Lecture Notes in Business Information Processing}, booktitle = {Lecture Notes in Business Information Processing}, number = {466}, publisher = {Springer Cham}, isbn = {978-3-031-26885-4 (Print) 978-3-031-26886-1 (online)}, doi = {https://doi.org/10.1007/978-3-031-26886-1_2}, year = {2023}, abstract = {Context awareness is critical for the successful execution of processes. In the abundance of business process management (BPM) research, frameworks exclusively devoted to extracting context from textual process data are scarce. With the deluge of textual data and its increasing value for organizations, it becomes essential to employ relevant text analytics techniques to increase the awareness of process workers, which is important for process execution. The present paper addresses this demand by developing a framework for context awareness based on process executions-related textual data using a well-established layered BPM context model. This framework combines and maps various text analytics techniques to the layers of the context model, aiming to increase the context awareness of process workers and facilitate informed decision-making. The framework is applied in an IT ticket processing case study. The findings show that contextual information obtained using our framework enriches the awareness of process workers regarding the process instance urgency, complexity, and upcoming tasks and assists in making decisions in terms of these aspects.}, language = {en} } @inproceedings{GoeckeEbertSpiegel2015, author = {Goecke, Sven-Frithjof and Ebert-Spiegel, Michael}, title = {Towards a More Robust Automated MAG Welding}, series = {2015 IEEE International Conference on Automation Science and Engineering (CASE) : 24 - 28 Aug. 2015, Gothenburg, Sweden}, booktitle = {2015 IEEE International Conference on Automation Science and Engineering (CASE) : 24 - 28 Aug. 2015, Gothenburg, Sweden}, publisher = {IEEE}, address = {Piscataway, NJ}, doi = {10.1109/coase.2015.7294114}, pages = {417 -- 418}, year = {2015}, language = {en} } @article{FlassigMangoldWoelfer2019, author = {Flassig, Robert J. and Mangold, Michael and W{\"o}lfer, Christian}, title = {Towards Design of Self-Organizing Biomimetic Systems}, series = {Advanced Biosystems}, volume = {3}, journal = {Advanced Biosystems}, number = {6}, publisher = {Wiley}, issn = {2366-7478}, doi = {/10.1002/adbi.201800320}, pages = {1800320}, year = {2019}, language = {en} } @article{OseevMukhinLucklumetal.2018, author = {Oseev, Aleksandr and Mukhin, Nikolay V. and Lucklum, Ralf and Zubtsov, Mikhail and Schmidt, Marc-Peter and Redka, Dmitrii and Kozyrev, Andrey and Hirsch, S{\"o}ren}, title = {Towards macroporous phononic crystal based structures for FBAR applications. Theoretical investigation of technologically competitive solutions}, series = {Microsystem Technologies}, volume = {24}, journal = {Microsystem Technologies}, number = {5}, doi = {10.1007/s00542-017-3616-1}, pages = {2389 -- 2399}, year = {2018}, language = {en} } @article{ChaurasiaGoeckeDe2023, author = {Chaurasia, Prashant Kumar and Goecke, Sven Frithjof and De, Amitava}, title = {Towards real-time monitoring of metal transfer and melt pool temperature field in gas metal arc directed energy deposition}, series = {Welding in the World}, journal = {Welding in the World}, number = {67}, publisher = {Springer Link}, doi = {https://doi.org/10.1007/s40194-023-01534-2}, pages = {1781 -- 1791}, year = {2023}, abstract = {Large three-dimensional metallic parts can be printed layer-by-layer using gas metal arc directed energy deposition (GMA-DED) process at a high deposition rate and with little or no material wastage. Fast responsive real-time monitoring of GMA-DED process signatures and their transient variations is required for printing of dimensionally accurate and structurally sound parts. A systematic experimental investigation is presented here on multi-layer GMA-DED with two different scanning strategies using a high strength low alloy (HSLA) filler wire. The dynamic metal transfer, melt pool temperature field and its longitudinal cross-section, and arc voltage and current are monitored synchronously. The transient arc heat input and the melt pool solidification cooling rate are estimated from the monitored signals. The layer-wise variations of the melt pool dimension, surface temperature profile, thermal cycles, and solidification cooling rate are examined for different scanning strategies. It is comprehended that the part defects can be minimized, and the mass production of zero-defect parts can be achieved in GMA-DED process with synchronized monitoring and assessment of the real-time process signatures.}, language = {en} } @inproceedings{Kraska2015, author = {Kraska, Martin}, title = {Transferangebote zum Leichtbau aus Forschung und Lehre an der Fachhochschule Brandenburg}, series = {Metalldialog Ostbrandenburg in Eisenh{\"u}ttenstadt - "Metall trifft Leichtbau", 17.09.2015}, booktitle = {Metalldialog Ostbrandenburg in Eisenh{\"u}ttenstadt - "Metall trifft Leichtbau", 17.09.2015}, year = {2015}, language = {de} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Tropfen auf dem kalten Wein}, series = {In: Physik in unserer Zeit 43 (2012) 5, 252-253}, journal = {In: Physik in unserer Zeit 43 (2012) 5, 252-253}, doi = {10.1002/piuz.201290081}, pages = {252 -- 253}, year = {2012}, abstract = {Viele kennen die leidvolle Erfahrung: Beim Fr{\"u}hst{\"u}ckstisch gießt man einen Schuss Milch in den Kaffee, und prompt spritzt eine kleine Font{\"a}ne aus der Tasse, und ein Tropfen landet - hier gilt Murphys Gesetz fast immer - auf dem frisch angezogenen Hemd oder mit etwas Gl{\"u}ck nur auf der Tischdecke. Man kann dieses Ph{\"a}nomen unter kontrollierten Bedingungen mit Hochgeschwindigkeits-Kameras analysieren und interessante Physik hinter den Spritzern aufsp{\"u}ren.}, language = {de} } @inproceedings{PlatonovAltynnikovMikhailovetal.2017, author = {Platonov, R. A. and Altynnikov, A. G. and Mikhailov, A. K. and Yastrebov, A. V. and Mukhin, N. V. and Hirsch, S{\"o}ren and Kozyrev, A. B.}, title = {Tunable impedance microwave matching of laser diodes}, series = {Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)}, booktitle = {Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)}, publisher = {IEEE}, address = {St Petersburg, Russia}, isbn = {978-1-5090-6269-0}, doi = {10.1109/PIERS.2017.8261920}, pages = {1152 -- 1157}, year = {2017}, language = {en} } @article{GedzelmanVollmer2009, author = {Gedzelman, S. D. and Vollmer, Michael}, title = {Twice in a blue moon}, series = {In: Weatherwise 62 (2009) 5, 28-35}, journal = {In: Weatherwise 62 (2009) 5, 28-35}, issn = {0043-1672}, pages = {28 -- 35}, year = {2009}, language = {en} } @inproceedings{MoellmannPinnoVollmer2010, author = {M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Two-color or ratio thermal imaging - potentials and limits}, series = {In: InfraMation proceedings. - Vol. 11 (2010), pp.41-56}, booktitle = {In: InfraMation proceedings. - Vol. 11 (2010), pp.41-56}, pages = {41 -- 56}, year = {2010}, language = {en} } @article{DaupayevEngelHirsch2025, author = {Daupayev, Nursultan and Engel, Christian and Hirsch, S{\"o}ren}, title = {Two-to-One Trigger Mechanism for Event-Based Environmental Sensing}, series = {Sensors}, volume = {25}, journal = {Sensors}, number = {13}, publisher = {MDPI}, doi = {10.3390/s25134107}, pages = {1 -- 18}, year = {2025}, abstract = {Environmental monitoring systems often operate continuously, measuring various parameters, including carbon dioxide levels (CO2), relative humidity (RH), temperature (T), and other factors that affect environmental conditions. Such systems are often referred to as smart systems because they can autonomously monitor and respond to environmental conditions and can be integrated both indoors and outdoors to detect, for example, structural anomalies. However, these systems typically have high energy consumption, data overload, and large equipment sizes, which makes them difficult to install in constrained spaces. Therefore, three challenges remain unresolved: efficient energy use, accurate data measurement, and compact installation. To address these limitations, this study proposes a two-to-one threshold sampling approach, where the CO2 measurement is activated when the specified T and RH change thresholds are exceeded. This event-driven method avoids redundant data collection, minimizes power consumption, and is suitable for resource-constrained embedded systems. The proposed approach was implemented on a low-power, small-form and self-made multivariate sensor based on the PIC16LF19156 microcontroller. In contrast, a commercial monitoring system and sensor modules based on the Arduino Uno were used for comparison. As a result, by activating only key points in the T and RH signals, the number of CO2 measurements was significantly reduced without loss of essential signal characteristics. Signal reconstruction from the reduced points demonstrated high accuracy, with a mean absolute error (MAE) of 0.0089 and root mean squared error (RMSE) of 0.0117. Despite reducing the number of CO2 measurements by approximately 41.9\%, the essential characteristics of the signal were saved, highlighting the efficiency of the proposed approach. Despite its effectiveness in controlled conditions (in buildings, indoors), environmental factors such as the presence of people, ventilation systems, and room layout can significantly alter the dynamics of CO2 concentrations, which may limit the implementation of this approach. Future studies will focus on the study of adaptive threshold mechanisms and context-dependent models that can adjust to changing conditions. This approach will expand the scope of application of the proposed two-to-one sampling technique in various practical situations.}, language = {en} } @techreport{Oertel2008, author = {Oertel, Christian}, title = {Tyre models in vehicle dynamics: theory and application, part 1: vehicle dynamics tyre model}, year = {2008}, language = {en} } @article{OertelWei2012, author = {Oertel, Christian and Wei, Yintao}, title = {Tyre rolling kinematics and prediction of tyre forces and moments: part I - theory and method}, series = {In: Vehicle system dynamics 50 (2012) 11, 1673-1687}, journal = {In: Vehicle system dynamics 50 (2012) 11, 1673-1687}, doi = {10.1080/00423114.2012.694452}, pages = {1673 -- 1687}, year = {2012}, abstract = {A new method to describe tyre rolling kinematics and how to calculate tyre forces and moments is presented. The Lagrange-Euler method is used to calculate the velocity and contact deformation of a tyre structure under large deformation. The calculation of structure deformation is based on the Lagrange method, while the Euler method is used to analyse the deformation and forces in the contact area. The method to predict tyre forces and moments is built using kinematic theory and nonlinear finite element analysis. A detailed analysis of the tyre tangential contact velocity and the relationships between contact forces, contact areas, lateral forces, and yaw and camber angles has been performed for specific tyres. Research on the parametric sensitivity of tyre lateral forces and self-aligning torque on tread stiffness and friction coefficients is carried out in the second part of this paper.}, language = {en} } @article{WeiOertelShena2012, author = {Wei, Yintao and Oertel, Christian and Shena, Xiaoliang}, title = {Tyre rolling kinematics and prediction of tyre forces and moments: part II - simulation and experiment}, series = {In: Vehicle system dynamics 50 (2012) 11, 1689-1706}, journal = {In: Vehicle system dynamics 50 (2012) 11, 1689-1706}, doi = {10.1080/00423114.2012.694453}, pages = {1689 -- 1706}, year = {2012}, abstract = {There are two aims for the second part of this paper: verifying the theory presented in the first part through parameter variation and comparison between simulation and experiment, and to study the effect of the belt structure on the cornering properties of radial tyres. Research has been carried out with a passenger car radial tyre and two different kinds of truck or bus radial tyres using both simulation and experiment. This second part of the paper shows that belt structure plays an important role in the generation of tyre forces and moments in addition to the effects of the tread stiffness and friction coefficients. The theory and method presented in this paper opens a new robust way to predict the tyre forces and moments from the tyre design and provides a reliable model for a generation mechanism.}, language = {en} } @article{NiehusMoellmannTrulletal.2003, author = {Niehus, Christina and M{\"o}llmann, Klaus-Peter and Trull, Thomas and Vollmer, Michael}, title = {Umweltanalytik mit Atomabsorptions- und Fourier-Transform-Infrarot- Spektroskopie}, series = {In: Praxis der Naturwissenschaften - Physik in der Schule 52 (2003) 4, 29-36}, journal = {In: Praxis der Naturwissenschaften - Physik in der Schule 52 (2003) 4, 29-36}, pages = {29 -- 36}, year = {2003}, language = {de} } @article{VollmerMoellmann2017, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Und es werde Feuer}, series = {Physik in unserer Zeit}, volume = {48}, journal = {Physik in unserer Zeit}, number = {1}, issn = {1521-3943 (Online)}, doi = {10.1002/piuz.201601467}, pages = {43 -- 44}, year = {2017}, language = {de} } @article{VollmerMoellmann2017, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Und es werde Feuer}, series = {Physik in unserer Zeit}, volume = {48}, journal = {Physik in unserer Zeit}, number = {2}, issn = {1521-3943 (Online)}, doi = {10.1002/piuz.201701474}, pages = {96 -- 97}, year = {2017}, language = {de} } @article{VollmerMoellmann2018, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Und sie dreht sich doch …}, series = {Physik in unserer Zeit}, volume = {49}, journal = {Physik in unserer Zeit}, number = {5}, doi = {10.1002/piuz.201801525}, pages = {254 -- 254}, year = {2018}, language = {de} }