@misc{SchnitzerEdel2006, author = {Schnitzer, Thomas and Edel, Karl-Otto}, title = {Fracture mechanical analysis and assessment of the extension of rolling contact fatigue cracks in railway rails}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:522-opus-69}, year = {2006}, abstract = {Rolling contact fatigue generates cracks on the running surface of high strength railway rails which grow under a small angle into the rail head. These cracks can cause in its last stage the fracturing of the rail. The crack extension behaviour is - as the origin of these cracks too - influenced by the cold working of the rail steel. The crack growth in the first stage is fracture mechanically analyzed by means of two-dimensional modelling. The simulation results are assessed for the use of rail grinding. A criterion for the change of the crack growth direction could not be derived, but the following stages of the crack growth in the transverse direction and the final fracture and the conditions for secondary fractures are considered. Rolling contact fatigue generates cracks on the running surface of high strength railway rails which grow under a small angle into the rail head. These cracks can cause in its last stage the fracturing of the rail. The crack extension behaviour is - as the origin of these cracks too - influenced by the cold working of the rail steel. The crack growth in the first stage is fracture mechanically analyzed by means of two-dimensional modelling. The simulation results are assessed for the use of rail grinding. A criterion for the change of the crack growth direction could not be derived, but the following stages of the crack growth in the transverse direction and the final fracture and the conditions for secondary fractures are considered.}, subject = {Eisenbahnschiene}, language = {en} } @inproceedings{EdelBoudnitski1997, author = {Edel, Karl-Otto and Boudnitski, Grigori}, title = {Fracture mechanical analysis of railway wheels with rolling defects}, series = {Fatigue design of components :this volume represents a selection of papers presented at the Second International Symposium on Fatigue Design, FD' 95, held in Helsinki, Finland on 5 - 8 September, 1995}, booktitle = {Fatigue design of components :this volume represents a selection of papers presented at the Second International Symposium on Fatigue Design, FD' 95, held in Helsinki, Finland on 5 - 8 September, 1995}, editor = {Marquis, Gary B.}, publisher = {Elsevier}, address = {Amsterdam ; New York}, isbn = {0-08-043318-9}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:522-opus-204}, year = {1997}, abstract = {Reusable solid wheels manufactured of the old steel BV1 (nearly equivalent to the solid or monobloc wheel steel R1 according to the new nomenclature) show in some cases rolling defects on the surface of the wheel disc. The fatigue behaviour of such defects is analysed by means of the linear-elastic fracture mechanics and Monte Carlo simulation and assessed to be able to derive the allowable defect size for the non-destructive testing. This paper was firstly presented at the Second International Symposium on Fatigue Design FD'95, held in Helsinki (Finland) on 5 - 8 September 1995. The complete research report is published under the title „Oberfl{\"a}chendefekte im Scheibenbereich" (Manufacturing surface defects in the disc area of solid wheels). The research work was sponsored by the Deutsche Forschungsgemeinschaft (DFG).}, subject = {Eisenbahn ; Fahrwerk ; Besch{\"a}digung ; Bruchmechanik}, language = {en} } @article{WidiputriLoeweLoeher2009, author = {Widiputri, Diah Indriani and L{\"o}we, Katharina and L{\"o}her, Heinz-Josef}, title = {Systematic approach to incorporate human factors into a process plant design}, series = {In : Process Safety Progress 28 (2009) 4, S. 347-355}, journal = {In : Process Safety Progress 28 (2009) 4, S. 347-355}, issn = {1066-8527}, pages = {347 -- 355}, year = {2009}, abstract = {Despite the increasing number of accidents in process industry caused by human error, there are still too few efforts devoted to this area. This is mainly caused by people's tendency to overestimate human's capability in interacting with their working environment and moreover by the unavailability of reliable analysis methods. Because of the current lack of adequate methods, human factors (HF) analysis is not widely performed in process industry. Some HF techniques developed in the process industry were examined regarding their practical applicability and were unfortunately proved to be unsuitable for an elaborate HF analysis. Therefore, a new approach was developed, which provides a systematic way in performing a qualitative HF analysis to achieve a safer operation and decrease the number of human failure events. HF consideration during the design of a process plant is the key to minimize accidents caused by human error in process industry. Thus, an approach to incorporate HF into design phase is described in this article, which can help achieving a safer operation as early as possible with minimized costs. © 2009 American Institute of Chemical Engineers Process Saf Prog 2009}, language = {en} } @article{HanspachPinno1992, author = {Hanspach, J. and Pinno, Frank}, title = {Concentration dependent diffusion of water in polyamide 6}, series = {In: acta polymerica, 43 (1992), 210-213}, journal = {In: acta polymerica, 43 (1992), 210-213}, pages = {210 -- 213}, year = {1992}, language = {en} } @inproceedings{HesselLoeweHaverkampetal.2000, author = {Hessel, V. and L{\"o}we, H. and Haverkamp, V. and Wille, Ch. and Ehrfeld, W. and Lutz, N. and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Herweck, Th.}, title = {Dynamic monitoring of fluid equipartition and heat release in a falling film microreactor using real-time thermography}, series = {In: MICRO.tec 2000 : applications - trends - visions ; proceedings / VDE World Microtechnologies Congress, September 25 - 27, 2000, Expo 2000, Hannover, Germany. Organized by VDE Association for Electrical, Electronic \& Information Technologies. Sponsored by EUREL ... . - Berlin ; Offenbach : VDE-Verl. - Vol. 2. - 2000. - S. 349 - 354. - ISBN 3-8007-2579-7}, booktitle = {In: MICRO.tec 2000 : applications - trends - visions ; proceedings / VDE World Microtechnologies Congress, September 25 - 27, 2000, Expo 2000, Hannover, Germany. Organized by VDE Association for Electrical, Electronic \& Information Technologies. Sponsored by EUREL ... . - Berlin ; Offenbach : VDE-Verl. - Vol. 2. - 2000. - S. 349 - 354. - ISBN 3-8007-2579-7}, pages = {349 -- 354}, year = {2000}, 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{HenkeKarstaedtMoellmannetal.2004, author = {Henke, S. and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Challenges in infrared imaging: low emissivities of hot gases, metals, and metallic cavities}, series = {In: InfraMation 2004 : proceedings / sponsored and published by the Inframation Training Center .... - Vol. 5, 355-363}, booktitle = {In: InfraMation 2004 : proceedings / sponsored and published by the Inframation Training Center .... - Vol. 5, 355-363}, pages = {355 -- 363}, year = {2004}, language = {en} } @inproceedings{HenkeKarstaedtMoellmannetal.2004, author = {Henke, S. and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Identification and suppression of thermal reflections in infrared thermal imaging}, series = {In: InfraMation 2004 : proceedings / sponsored and published by the Inframation Training Center .... - Vol. 5, 287-298}, booktitle = {In: InfraMation 2004 : proceedings / sponsored and published by the Inframation Training Center .... - Vol. 5, 287-298}, pages = {287 -- 298}, year = {2004}, language = {en} } @inproceedings{PinnoKarstaedtMoellmannetal.2005, author = {Pinno, Frank and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Using infrared thermography for optimization, quality control and minimization of damages of floor heating systems,}, series = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol. 6, 313-322}, booktitle = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol. 6, 313-322}, pages = {313 -- 322}, year = {2005}, language = {en} } @inproceedings{VollmerKarstaedtMoellmannetal.2005, author = {Vollmer, Michael and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank}, title = {IR Thermography of microwave ovens}, series = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol.6, 29-40}, booktitle = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol.6, 29-40}, pages = {29 -- 40}, year = {2005}, language = {en} } @inproceedings{MoellmannKarstaedtPinnoetal.2005, author = {M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef and Pinno, Frank and Vollmer, Michael}, title = {Selected critical applications for thermography: convections in fluids, selective emitters and highly reflecting materials}, series = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol.6, 161-174}, booktitle = {In: InfraMation 2005 : proceedings / sponsored and published by the Inframation Training Center .... Vol.6, 161-174}, pages = {161 -- 174}, year = {2005}, language = {en} } @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} } @inproceedings{PinnoKarstaedtMoellmannetal.2006, author = {Pinno, Frank and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Energy savings for an old factory building by optimisation of the heating system}, series = {In: InfraMation 2006 : proceedings / sponsored and published by the Inframation Training Center ... Vol. 7, 253-262}, booktitle = {In: InfraMation 2006 : proceedings / sponsored and published by the Inframation Training Center ... Vol. 7, 253-262}, pages = {253 -- 262}, year = {2006}, language = {en} } @inproceedings{VollmerKarstaedtMoellmannetal.2006, author = {Vollmer, Michael and Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank}, title = {Influence of gaseous species on thermal infrared imaging}, series = {In: InfraMation 2006 : proceedings / sponsored and published by the Inframation Training Center .... Vol.7, 65-78}, booktitle = {In: InfraMation 2006 : proceedings / sponsored and published by the Inframation Training Center .... Vol.7, 65-78}, pages = {65 -- 78}, year = {2006}, language = {en} } @inproceedings{PinnoMoellmannVollmer2007, author = {Pinno, Frank and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Cost and energy savings for a factory building after modernizing the heating system}, series = {In: InfraMation 2007 : proceedings / sponsored and published by the Inframation Training Center .... Vol.8, 521-527}, booktitle = {In: InfraMation 2007 : proceedings / sponsored and published by the Inframation Training Center .... Vol.8, 521-527}, pages = {521 -- 527}, year = {2007}, language = {en} } @inproceedings{VollmerMoellmannPinno2007, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Pinno, Frank}, title = {Looking through matter: quantitative IR imaging when observing through IR windows}, series = {In: InfraMation 2007 : proceedings / sponsored and published by the Inframation Training Center .... Vol. 8, 109-127}, booktitle = {In: InfraMation 2007 : proceedings / sponsored and published by the Inframation Training Center .... Vol. 8, 109-127}, pages = {109 -- 127}, year = {2007}, language = {en} } @book{VollmerMoellmann2010, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Infrared thermal imaging : fundamentals, research and applications}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {978-3-527-40717-0}, pages = {XVII, 593 S.}, year = {2010}, subject = {Infrarotthermographie}, language = {en} } @article{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Is there a maximum size of water drops in nature}, series = {In: The Physics Teacher 51 (2013), 400 - 402}, journal = {In: The Physics Teacher 51 (2013), 400 - 402}, pages = {400 -- 402}, year = {2013}, language = {en} } @article{VollmerShaw2013, author = {Vollmer, Michael and Shaw, Joseph A.}, title = {Brilliant colours from a white snow cover}, series = {In: Physics Education 48 (2013) 3, 322-221}, journal = {In: Physics Education 48 (2013) 3, 322-221}, pages = {322 -- 331}, year = {2013}, language = {en} } @article{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Removing coins from a dice tower: no magic - just physics}, series = {In: The Physics Teacher 51 (2013) 4, pp 212-214}, journal = {In: The Physics Teacher 51 (2013) 4, pp 212-214}, pages = {212 -- 214}, year = {2013}, language = {en} } @article{Vollmer2013, author = {Vollmer, Michael}, title = {Measuring distances in google earth}, series = {In: Physics Education 48 (2013) 2, 145-149}, journal = {In: Physics Education 48 (2013) 2, 145-149}, pages = {145 -- 149}, year = {2013}, language = {en} } @incollection{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {The Allure of Multicolored Images - Building Thermography Examined Closely}, series = {In: Renewable energy : sustainable concepts for the energy change / ed. by Roland Wengenmayr and Thomas B{\"u}hrke. - 2. ed., [completely rev. and updated]. - Weinheim : Wiley-VCH, 2013. - S. 145 - 147 ISBN 978-3-527-41187-0}, booktitle = {In: Renewable energy : sustainable concepts for the energy change / ed. by Roland Wengenmayr and Thomas B{\"u}hrke. - 2. ed., [completely rev. and updated]. - Weinheim : Wiley-VCH, 2013. - S. 145 - 147 ISBN 978-3-527-41187-0}, isbn = {978-3-527-41187-0}, year = {2013}, language = {en} } @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{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Surface temperatures of the Moon: measurements with commercial infrared cameras}, series = {In: European Journal of Physics 33 (2012), 1703-1719}, journal = {In: European Journal of Physics 33 (2012), 1703-1719}, pages = {1703 -- 1719}, year = {2012}, 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{VollmerMoellmannKarstaedt1999, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef}, title = {Lecture Demonstrations with Liquid Nitrogen}, series = {In: Proceedings / ICPE-GIREP International Conference Hands on Experiments in Physics Education [Medienkombination] : Duisburg - Germany, August 23 - 28, 1998 / ed. Gernot Born ... - Duisburg : Didaktik der Physik, Univ. - 1999 ISBN 3-00-004409-4}, booktitle = {In: Proceedings / ICPE-GIREP International Conference Hands on Experiments in Physics Education [Medienkombination] : Duisburg - Germany, August 23 - 28, 1998 / ed. Gernot Born ... - Duisburg : Didaktik der Physik, Univ. - 1999 ISBN 3-00-004409-4}, year = {1999}, language = {en} } @inproceedings{Vollmer2004, author = {Vollmer, Michael}, title = {Infrared thermal imaging for physics education : visualization of physical phenomena}, series = {In: Proceedings of the GIREP Intern. Conf. on Physics in new fields and modern applications, held August 5 - 9, 2002, in Lund, Sweden. - Lund, 2004}, booktitle = {In: Proceedings of the GIREP Intern. Conf. on Physics in new fields and modern applications, held August 5 - 9, 2002, in Lund, Sweden. - Lund, 2004}, year = {2004}, language = {en} } @article{Vollmer2005, author = {Vollmer, Michael}, title = {Diffraction revisited : position of diffraction spots upon rotation of a transmission grating}, series = {In: Physics education 40 (2005), 562-565}, journal = {In: Physics education 40 (2005), 562-565}, pages = {562 -- 565}, year = {2005}, language = {en} } @article{Vollmer2005, author = {Vollmer, Michael}, title = {Hot gases : transition from line spectra to thermal radiation}, series = {In: American journal of physics 73 (2005), 215-223}, journal = {In: American journal of physics 73 (2005), 215-223}, pages = {215 -- 223}, year = {2005}, abstract = {The question of how the line spectrum of atoms is transformed into the continuous spectrum of thermal radiation of a gas by repeated absorption and emission of photons is addressed. We consider a simple model of a hydrogen-like gas in thermal equilibrium where only the Lyman-α transition is allowed and calculate the spectra for increasing thickness of the gas. The transition from line spectra for optically thin samples to the spectra of thermal radiation for optically thick samples is demonstrated. We estimate the emissivities for hot gases and study the line width of spectral lines due to self-absorption processes.}, language = {en} } @article{CowleyLavenVollmer2005, author = {Cowley, L. and Laven, Ph. and Vollmer, Michael}, title = {Rings around sun and moon : coronae and diffraction}, series = {In: Physics Education 40 (2005) 1, 51-59}, journal = {In: Physics Education 40 (2005) 1, 51-59}, pages = {51 -- 59}, year = {2005}, language = {en} } @article{VollmerMoellmannKarstaedt2004, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef}, title = {Microwave oven experiments with metals and light sources}, series = {In: Physics Education 39 (2004), 500-508}, journal = {In: Physics Education 39 (2004), 500-508}, pages = {500 -- 508}, year = {2004}, abstract = {Don't put metal objects in the microwave' is common safety advice. But why? Here we describe demonstration experiments involving placing household metallic objects in a microwave oven. These allow a better understanding of the interaction of microwaves with materials. Light bulbs and discharge lamps can also be used in instructive demonstrations.}, language = {en} } @article{VollmerMoellmannKarstaedt2004, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef}, title = {More experiments with microwave ovens}, series = {In: Physics education 39 (2004) 4, 346 - 351}, journal = {In: Physics education 39 (2004) 4, 346 - 351}, pages = {346 -- 351}, year = {2004}, abstract = {Microwave ovens can be used to perform exciting demonstrations that illustrate a variety of physics topics. Experiments discussed here show superheating, visualize the inhomogeneous heating that takes place in a microwave and also show how to use a mobile phone to detect radiation leaking from the oven. Finally eggs can give some spectacular (though messy) explosions. In all cases please note the safety advice given.}, language = {en} } @article{ParkerVollmer2004, author = {Parker, Kerry and Vollmer, Michael}, title = {Bad food and good physics : the development of domestic microwave cookery}, series = {In: Physics Education 39 (2004) 1, 82-90}, journal = {In: Physics Education 39 (2004) 1, 82-90}, pages = {82 -- 90}, year = {2004}, abstract = {This article forms the second of two papers on the subject of microwave cookers. In the first paper Michael Vollmer describes the physics behind the production of microwaves in the magnetron of the oven, the waveguide and the interaction between the microwaves and the food. This article looks at the physics of cooking, and how the appliance and the food industries have developed products which are now part of many of our students' lifestyles. We include many interesting demonstrations that illustrate this history and which could be used to teach many principles of physics.}, language = {en} } @article{Vollmer2004, author = {Vollmer, Michael}, title = {Physics of the microwave oven}, series = {In: Physics education 39 (2004) 1, 74-81}, journal = {In: Physics education 39 (2004) 1, 74-81}, pages = {74 -- 81}, year = {2004}, abstract = {This is the first of two articles about the physics of microwave ovens. This article deals with the generation of microwaves in the oven and includes the operation of the magnetrons, waveguides and standing waves in resonant cavities. It then considers the absorption of microwaves by foods, discussing the dielectric relaxation of water, penetration depths of electromagnetic waves in matter and, in considering the possible chemical changes during the microwave heating, multi-photon ionization or dissociation.}, language = {en} } @article{Vollmer2003, author = {Vollmer, Michael}, title = {Physics teacher training and research in physics education: results of an inquiry by the European Physical Society}, series = {In: European journal of physics 24 (2003), 131-147}, journal = {In: European journal of physics 24 (2003), 131-147}, pages = {131 -- 147}, year = {2003}, abstract = {An inquiry among national experts on physics education research and teaching has been carried out using a questionnaire that deals with the organization of physics teacher training and the main tasks and research activities of professionals in physics education. The goal was to collect data on a European scale on physics teacher training at universities by professionals as well as on research activities by professionals in the field of physics education. Results are presented based on answers from 22 European countries.}, language = {en} } @article{Vollmer2003, author = {Vollmer, Michael}, title = {Estimating the thickness of the atmosphere by rayleigh scattering}, series = {In: American journal of physics 71 (2003) 10, 979-983}, journal = {In: American journal of physics 71 (2003) 10, 979-983}, pages = {979 -- 983}, year = {2003}, 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} } @article{Vollmer2009, author = {Vollmer, Michael}, title = {Newton´s law of cooling revisited}, series = {In: European Journal of Physics 30 (2009), 1063-1084}, journal = {In: European Journal of Physics 30 (2009), 1063-1084}, issn = {0143-0807}, pages = {1063 -- 1084}, year = {2009}, language = {en} } @article{GedzelmanVollmer2009, author = {Gedzelman, S. D. and Vollmer, Michael}, title = {Progress in atmospheric optics and light and color in nature}, series = {In: Bulletin of the American Meteorological Society : BAMS 90 (2009), 689-693}, journal = {In: Bulletin of the American Meteorological Society : BAMS 90 (2009), 689-693}, issn = {0003-0007}, pages = {689}, year = {2009}, language = {en} } @article{Vollmer2009, author = {Vollmer, Michael}, title = {Mirrors in the Air: Mirages in Nature and in the Laboratory}, series = {In: Physics Education 44 (2009) 2, 165-174}, journal = {In: Physics Education 44 (2009) 2, 165-174}, issn = {0031-9120}, pages = {165 -- 174}, year = {2009}, language = {en} } @article{VollmerMoellmann2008, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Michelson Interferometer for your kitchen table}, series = {In: The Physics Teacher 46 (2008), 114-117}, journal = {In: The Physics Teacher 46 (2008), 114-117}, issn = {0031-921x}, pages = {114 -- 117}, year = {2008}, 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{VollmerMoellmannArnold2007, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Arnold, F.}, title = {Locomotion by blowing into the sail of a sailboat? From a basic physics question to thrust reversal of jet airplanes}, series = {In: Physics Education 42 (2007), 369-377}, journal = {In: Physics Education 42 (2007), 369-377}, issn = {0031-9120}, pages = {369 -- 377}, year = {2007}, language = {en} } @article{VollmerMoellmann2007, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Infrared thermal imaging as a tool in university physics education}, series = {In: European Journal of Physics 28 (2007), S37-S50}, journal = {In: European Journal of Physics 28 (2007), S37-S50}, pages = {37 -- 50}, year = {2007}, language = {en} } @article{MoellmannVollmer2006, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Measurements and predictions of the illuminance during a solar eclipse}, series = {In: European journal of physics 27 (2006), 1299-1314}, journal = {In: European journal of physics 27 (2006), 1299-1314}, pages = {1299 -- 1314}, year = {2006}, abstract = {Measurements of illuminance during a solar eclipse are presented. The data are compared to theoretical predictions, based on a geometrical model for obscuration. The model assumes a straight and uniform motion of the sun and moon as well as a spherical shape of both, i.e. it neglects any effects of limb darkening. Furthermore, the sun's disk is assumed to have homogeneous luminosity, i.e. any luminosity variations due to sun spots are neglected. Input parameters are the duration of the eclipse, the duration of totality, the impact parameter, i.e. the distance between the two trajectories of sun and moon, and the sizes of sun and moon. The model applies to all types of eclipses, partial, annular and total.}, language = {en} } @article{VollmerGedzelman2006, author = {Vollmer, Michael and Gedzelman, S. D.}, title = {Colors of the sun and moon : the role of the optical air mass}, series = {In: European journal of physics 27 (2006), 299-309}, journal = {In: European journal of physics 27 (2006), 299-309}, pages = {299 -- 309}, year = {2006}, abstract = {A geometric model for the optical air mass of the atmosphere is developed. Using the model, simple formulae are derived for the optical thickness of light passing through (1) a molecular atmosphere, (2) an atmosphere with uniformly distributed tropospheric aerosols and (3) atmospheres with elevated aerosol layers. The formulae are used to model the spectra and perceived colours of the Sun and Moon.}, language = {en} } @article{SchneiderVollmer2005, author = {Schneider, Werner B. and Vollmer, Michael}, title = {Experimental simulations of pollen coronas}, series = {In: Applied optics 44 (2005) 27, 5746-5753}, journal = {In: Applied optics 44 (2005) 27, 5746-5753}, doi = {10.1364/AO.44.005746}, pages = {5746 -- 5753}, year = {2005}, abstract = {A procedure to experimentally simulate pollen coronas is discussed. Observed coronas are due to pine and birch pollen having different geometries. Using computer simulations, two-dimensional projections of a large number of pollenlike objects with adjustable shapes, with or without preferential orientation and statistical or regular spatial distribution, are generated. The photograph of the printout allows samples with typical sizes between 20 and 200 µm. Their diffraction patterns can closely resemble the ones observed in nature and predicted by theory. © 2005 Optical Society of America}, language = {en} } @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} } @article{VollmerGreenler2003, author = {Vollmer, Michael and Greenler, Robert}, title = {More Halo and Mirage Experiments in Atmospheric Optics}, series = {In: Applied Optics 42 (2003) 3, pp. 394-398}, journal = {In: Applied Optics 42 (2003) 3, pp. 394-398}, doi = {10.1364/AO.42.000394}, year = {2003}, abstract = {Some laboratory demonstrations on atmospheric optics are presented. The focus is on dispersion effects in mirages, lateral mirages, and inferior mirages produced with small hot plates. We also show a demonstration of the upper-tangent-arc halo, produced with a hexagonal prism, rotating about two axes. © 2003 Optical Society of America}, language = {en} } @article{VollmerTammer1998, author = {Vollmer, Michael and Tammer, Robert}, title = {Laboratory Experiments in Atmospheric Optics}, series = {In: Applied optics 37 (1998) 9, pp. 1557-1568}, journal = {In: Applied optics 37 (1998) 9, pp. 1557-1568}, doi = {10.1364/AO.37.001557}, pages = {1557 -- 1568}, year = {1998}, abstract = {Old and new laboratory experiments on atmospheric optics with a focus on mirages, rainbows, and halos are presented. Some qualitative demonstrations serve primarily didactical purposes, e.g., by proving the existence of curved light rays in media with a gradient of the index of refraction, by directly visualizing the minimum-deviation curve for rainbow paths in water droplets, or by helping to elucidate the ray classes in hexagons that contribute to a specific halo. In addition, quantitative experiments allow a direct comparison of angular positions and intensities with analytical computations or Monte Carlo simulations of light scattering from small water droplets or ice hexagons. In particular, the latter can help us to understand complex halo phenomena. © 1998 Optical Society of America}, language = {en} } @inproceedings{MoellmannPinnoVollmer2009, author = {M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Microscopic and high-speed thermal imaging: a powerful tool in physics R\&D}, series = {In: InfraMation proceedings Vol.10 (2009), 303-317}, booktitle = {In: InfraMation proceedings Vol.10 (2009), 303-317}, pages = {303 -- 317}, year = {2009}, language = {en} } @inproceedings{VollmerMoellmannPinno2008, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Pinno, Frank}, title = {Cheese cubes, light bulbs, soft drinks: An unusual approach to study convection, radiation and size dependent heating and cooling}, series = {In: InfraMation proceedings Vol. 9 (2008), p. 477-492}, booktitle = {In: InfraMation proceedings Vol. 9 (2008), p. 477-492}, pages = {477 -- 492}, year = {2008}, language = {en} }