@article{VollmerGedzelman2009, author = {Vollmer, Michael and Gedzelman, S. D.}, title = {Blauer Mond: poetische Methapher oder beobachtbares Ph{\"a}nomen?}, series = {In: Naturwissenschaftliche Rundschau 62 (2009) 6, 285-291}, journal = {In: Naturwissenschaftliche Rundschau 62 (2009) 6, 285-291}, pages = {285 -- 291}, year = {2009}, language = {de} } @article{Vollmer2009, author = {Vollmer, Michael}, title = {Sonnen- und Mondfinsternisse: Beobachtungen, Messungen und quantitative Modelle}, series = {In: Praxis der Naturwissenschaften - Physik in der Schule 58 (2009) 2, 38-44}, journal = {In: Praxis der Naturwissenschaften - Physik in der Schule 58 (2009) 2, 38-44}, pages = {38 -- 44}, year = {2009}, language = {de} } @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} } @article{VollmerMoellmann2008, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Infrarotkameras: es gibt mehr zu sehen als unsere Augen wahrnehmen}, series = {In: Naturwissensschaftliche Rundschau 61 (2008) 11, 557—565}, journal = {In: Naturwissensschaftliche Rundschau 61 (2008) 11, 557—565}, pages = {557 -- 565}, year = {2008}, language = {de} } @article{VollmerMoellmannArnold2008, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Arnold, Frank}, title = {Ins eigene Segel blasen. M{\"u}nchhausen-Effekt und Schubumkehr}, series = {In: Physik in unserer Zeit 39 (2008) 5, 241-245}, journal = {In: Physik in unserer Zeit 39 (2008) 5, 241-245}, doi = {10.1002/piuz.200801172}, pages = {241 -- 245}, year = {2008}, abstract = {Kann man sich mit seinem Segelboot fortbewegen, indem man ins eigene Segel bl{\"a}st? Der Impulssatz erlaubt diesen an M{\"u}nchhausen erinnernden Effekt. Das demonstriert ein vereinfachtes Gedankenexperiment, bei dem der Segler durch den Werfer eines Balls und das Segel durch eine starre Wand ersetzt wird. Allerdings ergibt die naive Theorie, die Luftmolek{\"u}le als ball{\"a}hnliche Korpuskeln auffasst, einen zu hohen Impuls des reflektierten Luftstroms. Eine realistische Beschreibung liefert die moderne Str{\"o}mungstheorie. Ihre Resultate sind experimentell erfolgreich umsetzbar. Technisch angewendet wird das Prinzip in der Schubumkehr von Flugzeugtriebwerken.}, language = {de} } @incollection{ChiaverinaVollmer2006, author = {Chiaverina, Chris and Vollmer, Michael}, title = {Learning physics from the experiments}, series = {In: Informal learning and public understanding of physics : third international GIREP seminar 2005 ; selected contributions ; [5 - 9 September 2005, Ljubljana, Slovenia] / ed.: Gorazd Planinšič ... Ljubljana : Faculty of Mathematics and Physics, 2006}, booktitle = {In: Informal learning and public understanding of physics : third international GIREP seminar 2005 ; selected contributions ; [5 - 9 September 2005, Ljubljana, Slovenia] / ed.: Gorazd Planinšič ... Ljubljana : Faculty of Mathematics and Physics, 2006}, publisher = {Faculty of Mathematics and Physics}, address = {Ljubljana}, year = {2006}, 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} } @inproceedings{KretzschmarJohannsen2009, author = {Kretzschmar, Jens and Johannsen, Andreas}, title = {Infrastrukturen f{\"u}r hochverf{\"u}gbare SaaS-L{\"o}sungen}, series = {In: Software as a service - ein Modell f{\"u}r die Zukunft? : Tagungsband zum 8. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 18. Juni 2009 / Robert U. Franz ... (Hrsg.). - Aachen : Shaker, 2009. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-8238-7}, booktitle = {In: Software as a service - ein Modell f{\"u}r die Zukunft? : Tagungsband zum 8. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 18. Juni 2009 / Robert U. Franz ... (Hrsg.). - Aachen : Shaker, 2009. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-8238-7}, pages = {73 -- 81}, year = {2009}, language = {de} } @inproceedings{BinderJohannsen2008, author = {Binder, Carsten and Johannsen, Andreas}, title = {Nutzen und Perspektiven des BI-Einsatzes bei einem mittelst{\"a}ndischen Metallverarbeiter}, series = {In: Business intelligence : ein Mehrwert f{\"u}r das Unternehmen? ; Tagungsband zum 7. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 12. Juni 2008 / Robert U. Franz ... (Hrsg.). .- Aachen : Shaker, 2008. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-7277-7}, booktitle = {In: Business intelligence : ein Mehrwert f{\"u}r das Unternehmen? ; Tagungsband zum 7. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 12. Juni 2008 / Robert U. Franz ... (Hrsg.). .- Aachen : Shaker, 2008. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-7277-7}, pages = {43 -- 57}, year = {2008}, language = {de} } @inproceedings{ZinowHarterJohannsen2008, author = {Zinow, Rainer and Harter, Frank and Johannsen, Andreas}, title = {Zukunft der Gesch{\"a}ftsanalytik : Unternehmenssteuerung am Beispiel einer innovativen, Service-basierten Mittelstandskonzeption}, series = {In: Business intelligence : ein Mehrwert f{\"u}r das Unternehmen? ; Tagungsband zum 7. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 12. Juni 2008 / Robert U. Franz ... (Hrsg.). .- Aachen : Shaker, 2008. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-7277-7}, booktitle = {In: Business intelligence : ein Mehrwert f{\"u}r das Unternehmen? ; Tagungsband zum 7. Berlin-Brandenburger SAP-Forum der Fachhochschule Brandenburg am 12. Juni 2008 / Robert U. Franz ... (Hrsg.). .- Aachen : Shaker, 2008. - (Berichte aus der Wirtschaftsinformatik). - ISBN 978-3-8322-7277-7}, pages = {13 -- 27}, year = {2008}, language = {de} } @article{LuethyEhret2012, author = {L{\"u}thy, Anja and Ehret, Tanja}, title = {Begehrt: Die Generation Y}, series = {In: Health \& Care Management 3 (2012) 10}, journal = {In: Health \& Care Management 3 (2012) 10}, year = {2012}, abstract = {Die Healthcare-Branche steht vor vielf{\"a}ltigen Herausforderungen. Eine nicht zu untersch{\"a}tzende ist die Integration einer neuen Mitarbeitergeneration, der Generation Y. Die Ende der 80er Jahre geborenen Young Professionals stehen dem Arbeitsmarkt noch etwa 40 Jahre zur Verf{\"u}gung. Nutzen Sie deren Potenzial - wir zeigen Ihnen wie.}, language = {de} } @article{LuethyStoffers2013, author = {L{\"u}thy, Anja and Stoffers, Christian}, title = {Die Generation Y gewinnen : Social Media im Personalmarketing}, series = {In: Die Schwester, der Pfleger : die Fachzeitschrift f{\"u}r Pflegeberufe 52 (2013) 1, S. 46-49}, journal = {In: Die Schwester, der Pfleger : die Fachzeitschrift f{\"u}r Pflegeberufe 52 (2013) 1, S. 46-49}, issn = {0340-5303}, pages = {46 -- 49}, year = {2013}, subject = {Social Media}, language = {de} } @incollection{Luethy2014, author = {L{\"u}thy, Anja}, title = {Employer Branding, Rekrutierung und Social Media - Werben Sie erfolgreich um Mitarbeiter!}, series = {In: BEHR'S Jahrbuch Gesundheit und Pflege 2014 : Themen, Trends, Termine. - Hamburg : Behr's Verl., 2014. - ISBN 978-3-95468-089-4}, booktitle = {In: BEHR'S Jahrbuch Gesundheit und Pflege 2014 : Themen, Trends, Termine. - Hamburg : Behr's Verl., 2014. - ISBN 978-3-95468-089-4}, pages = {17 -- 40}, year = {2014}, language = {de} } @inproceedings{Edel2013, author = {Edel, Karl-Otto}, title = {Bologna und der Wandel der akademischen Bildung}, series = {25. Kulturanthropologisch-Philosophischen Canetti-Symposion "Wider den Erziehungszwang", 22. und 23. November 2013, Wien, Alte Schmiede Kunstverein}, booktitle = {25. Kulturanthropologisch-Philosophischen Canetti-Symposion "Wider den Erziehungszwang", 22. und 23. November 2013, Wien, Alte Schmiede Kunstverein}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:522-opus4-8465}, pages = {18}, year = {2013}, abstract = {Der Name BOLOGNA steht f{\"u}r die wohl {\"a}lteste Universit{\"a}t Europas, f{\"u}r den h{\"o}chsten akademischen Grad eines Doktors und in der Vergangenheit auch f{\"u}r die akademische Gerichtsbarkeit. Die Entwicklungen, die zu dem gemeinhin als Bologna-Prozeß bezeichneten Umw{\"a}lzungen im Bereich der akademischen Bildung gef{\"u}hrt haben, werden ebenso betrachtet wie die Wirkungen dieses Prozesses auf das akademische Bildungsniveau und die Entwicklungen abseits des Bologna-Prozesses.}, language = {de} } @inproceedings{KnoblochSlomczyk2014, author = {Knobloch, Florian and Slomczyk, Sebastian}, title = {Pulsfrequenzmodulierte Visible Light Communication f{\"u}r vernetzte LED Beleuchtung}, series = {4. Elektronik lighting congress 2014, M{\"u}nchen, 27. Mai 2014,}, booktitle = {4. Elektronik lighting congress 2014, M{\"u}nchen, 27. Mai 2014,}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:522-opus4-8534}, pages = {7}, year = {2014}, abstract = {F{\"u}r individualisierte Beleuchtungen, bedarf es einer Kommunikation zwischen den Leuchten. Hierf{\"u}r kann LED-Licht genutzt werden. F{\"u}r die optische kabellose Kommunikation im sichtbaren Lichtbereich (bzw. Visible Light Communication - VLC) kann eine diskrete Pulsfrequenzmodulation (PFM) f{\"u}r den Einsatz mit indirektem Licht genutzt werden. Ein Konzept zur Pulsfrequenzmodu-lation (PFM) wird vorgestellt und experimentell analysiert. Aufbau und Funktionsweise der PFM werden anhand einer Simulation des Empf{\"a}ngers vorgestellt. Daran anschließend wird in der Sicherungsschicht das Listen Before Talk Verfahren zum koordinierten Kanalzugriff erl{\"a}utert.}, language = {de} } @book{NagelMieke2014, author = {Nagel, Michael and Mieke, Christian}, title = {BWL-Methoden : Handbuch f{\"u}r Studium und Praxis}, edition = {1. Aufl.}, publisher = {UVK}, address = {Konstanz}, isbn = {978-3-8252-8564-7}, pages = {379}, year = {2014}, subject = {Betriebswirtschaftslehre}, language = {de} } @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} } @article{GoetzHoheiselTraegeretal.1995, author = {G{\"o}tz, T. and Hoheisel, W. and Tr{\"a}ger, F. and Vollmer, Michael}, title = {Characterization of Large Supported Metal Clusters by Optical Spectroscopy}, series = {In: Zeitschrift f{\"u}r Physik / D Vol. 33 (1995) 2, pp 133-141}, journal = {In: Zeitschrift f{\"u}r Physik / D Vol. 33 (1995) 2, pp 133-141}, doi = {10.1007/BF01437432}, year = {1995}, abstract = {Small sodium and silver particles were generated on dielectric substrates like LiF, quartz and sapphire under ultrahigh vacuum conditions. The optical transmission spectra of the clusters were measured as a function of cluster size and shape, for low and high substrate temperatures as well as for s- and p- polarization of the incident light. Excitation of dipolar surface plasmon oscillations in the directions normal and parallel to the substrate surface could be identified. Furthermore, optical spectra for Na and Ag clusters were calculated with the classical Mie theory. The measured spectra vary strongly if the experimental conditions are changed and can be exploited, for example, to characterize the particles with regard to their size and shape. In particular, the axial ratio of the spheroidal clusters could be determined. Its value is considerably different for the two investigated metals and depends on the substrate material. Furthermore, the temperature of the substrate has a pronounced influence on the shape of the particles. At low temperature of T=100 K two-dimensional island growth is predominant. The particles extend only little in the direction perpendicular to the surface and coalesce readily at small coverage of metal atoms. In contrast, the clusters are truly three-dimensional at T=300 K. At this stage, sodium particles still exhibit a rather small axial ratio whereas silver clusters appear almost spherical. Thus, measurements of the optical spectra permit direct in situ monitoring of cluster growth during the nucleation of adsorbed atoms and of temperature induced shape variations. In addition to investigations of the shape of the particles, the quadrupolar surface plasmon mode was observed for Ag clusters.}, language = {en} } @inproceedings{Vollmer1994, author = {Vollmer, Michael}, title = {Ablation of Metal Particles with Laser Light: Shape and Polarization Effects}, series = {In: Laser ablation: mechanisms and applications - II : second international conference, Knoxville, TN April 1993 / eds.: John C. Miller ...- New York : American Inst. of Physics, 1994. - (AIP conference proceedings / American Institute of Physics. - Melville, NY, 1970- ; 288) (Laser ablation: mechanisms and applications. - New York : American Institute of Physics ; 2). - S. 32 ff}, booktitle = {In: Laser ablation: mechanisms and applications - II : second international conference, Knoxville, TN April 1993 / eds.: John C. Miller ...- New York : American Inst. of Physics, 1994. - (AIP conference proceedings / American Institute of Physics. - Melville, NY, 1970- ; 288) (Laser ablation: mechanisms and applications. - New York : American Institute of Physics ; 2). - S. 32 ff}, pages = {32 -- 37}, year = {1994}, language = {en} } @article{HoevelFritzHilgeretal.1993, author = {H{\"o}vel, H. and Fritz, S. and Hilger, A. and Kreibig, U. and Vollmer, Michael}, title = {Width of cluster plasmon resonances: Bulk dielectric functions and chemical interface damping}, series = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, journal = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, doi = {10.1103/PhysRevB.48.18178}, year = {1993}, abstract = {The damping of collective electron resonances in clusters which develop into plasmon polaritons at larger sizes is investigated for free, supported, and embedded neutral metal clusters. Embedding of free 2 nm Ag clusters of 2-nm diameter into a SiO2 matrix leads to an increase of the width of the resonances by more than a factor of 3. The optical spectra are compared with the Mie theory using size-effect-modified dielectric functions of the solid state. The results corroborate the assumption that the widths of the resonances strongly depend on chemical interface effects. The results are briefly discussed with regard to limited-mean-free-path and quantum-size-effect theories and a recent approach by Persson. It is demonstrated that the widths of the spectra of supported and embedded clusters have to be interpreted with care since true intrinsic size effects of the clusters appear to be less effective than previously believed and can be obscured by the chemical interface damping. © 1993 The American Physical Society}, language = {en} } @article{GoetzTraegerVollmer1993, author = {G{\"o}tz, T. and Tr{\"a}ger, F. and Vollmer, Michael}, title = {Desorption of metal atoms with laser light of different polarization}, series = {In: Applied physics / A 57 (1993) 1, pp 101-104}, journal = {In: Applied physics / A 57 (1993) 1, pp 101-104}, doi = {10.1007/BF00331225}, pages = {101 -- 104}, year = {1993}, abstract = {Laser-induced desorption of metal atoms from the surface of small metal particles has been investigated as a function of the shape of the particles and the polarization of the incident laser light. The particles were supported on LiF, quartz or sapphire substrates. In a first set of experiments, the shape of the particles was determined by recording optical transmission spectra with s- and p-polarized light incident under an angle of typically 40° with respect to the surface normal. The metal particles turn out to be oblate, the ratio of the axes perpendicular and parallel to the substrate surface being on the order of 0.5. This ratio decreases with increasing particle size. Also, the particles change shape if the temperature is raised. In further experiments, s- and p-polarized light has been used to stimulate desorption of atoms via surface plasmon excitation. It is found that the desorption rate markedly depends on the polarization of the light. This is explained by excitation of the collective electron oscillation along different axes of the non-spherical particles.}, language = {en} } @article{HoheiselVollmerTraeger1993, author = {Hoheisel, W. and Vollmer, Michael and Tr{\"a}ger, F.}, title = {Desorption of metal atoms with laser light: Mechanistic studies}, series = {In: Physical Review / B 48 1993) 23, 17463-17476}, journal = {In: Physical Review / B 48 1993) 23, 17463-17476}, doi = {10.1103/PhysRevB.48.17463}, year = {1993}, abstract = {Results on laser-induced desorption of metal atoms from small metal particles are presented. Experiments have been performed on sodium, potassium, and silver particles supported on a LiF(100) single-crystal surface under ultrahigh vacuum conditions. Measurements include the determination of the desorption rate as a function of laser wavelength, laser intensity, average particle size, and substrate temperature, the determination of the kinetic energy of the desorbed atoms, the investigation of the optical spectra of the supported metal particles, and the study of the influence of adsorbate molecules on the desorption rate. Furthermore, theoretical extinction and absorption spectra of the metal particles have been calculated with the classical electrodynamical Mie theory as a function of average particle size and excitation wavelength. Also, the radial electric field at the particle surface was computed. The results of the experiments and theoretical calculations are combined to give a consistent picture of the mechanism of metal-atom desorption by electronic excitation with laser light. A realistic surface potential from which the atoms escape and nonlocal optical effects are taken into account. The latter introduce additional absorption channels by the formation of electron-hole pairs in the surface layer of the particle which relax into antibonding states before desorption occurs. Finally, the mechanism is discussed in the light of similar phenomena observed for thin metal films. Possibilities for future work are outlined. © 1993 The American Physical Society}, language = {en} } @article{GoetzHoheiselTraegeretal.1993, author = {G{\"o}tz, T. and Hoheisel, W. and Tr{\"a}ger, F. and Vollmer, Michael}, title = {Interplay between collective and single electron excitations in large metal clusters}, series = {In: Zeitschrift f{\"u}r Physik / D 26 (1993), 267-269}, journal = {In: Zeitschrift f{\"u}r Physik / D 26 (1993), 267-269}, year = {1993}, language = {en} } @incollection{VollmerKreibig1992, author = {Vollmer, Michael and Kreibig, U.}, title = {Collective excitations of large metal clusters}, series = {In: Nuclear physics concepts in the study of atomic cluster physics : proceedings of the 88th W.-E.-Heraeus-Seminar, held at Bad Honnef, FRG, 26 - 29 November 1991 / R. Schmidt ... (ed.). - Berlin [u.a.] : Springer, 1992. - (Lecture notes in physics ; Vol. 404). - ISBN 3-540-55625-7 ; 0-387-55625-7. - S. 266-276}, booktitle = {In: Nuclear physics concepts in the study of atomic cluster physics : proceedings of the 88th W.-E.-Heraeus-Seminar, held at Bad Honnef, FRG, 26 - 29 November 1991 / R. Schmidt ... (ed.). - Berlin [u.a.] : Springer, 1992. - (Lecture notes in physics ; Vol. 404). - ISBN 3-540-55625-7 ; 0-387-55625-7. - S. 266-276}, doi = {10.1007/3-540-55625-7_30}, pages = {266 -- 276}, year = {1992}, abstract = {Studies of the evolution of the optical properties of metal clusters as a function of size have gained considerable attention in the last few years. One theoretical approach starts from large metal clusters, which can be described by classical electrodynamics, provided the dielectric functions of the clusters are known. the resulting resonant features in the absorption spectra are commonly called surface plasmons and are collective excitations of the electron system.The present paper discusses the electrodynamic (Mie) theory for large clusters of different metals, also considering the range of validity of this approach towards smaller cluster sizes. More details can be found in an extended review on this topic which is to be published soon [1].}, 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} } @inproceedings{MoellmannPinnoVollmer2008, author = {M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Night sky radiant cooling - influence on outdoor thermal imaging analysis}, series = {In: InfraMation proceedings Vol. 9 (2008), 279-295}, booktitle = {In: InfraMation proceedings Vol. 9 (2008), 279-295}, pages = {279 -- 295}, year = {2008}, 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{VollmerGedzelman2008, author = {Vollmer, Michael and Gedzelman, Stanley David}, title = {Simulating irradiance during lunar eclipses: the spherically Symmetric case}, series = {In: Applied Optics 47 (2008) 34, H52-61}, journal = {In: Applied Optics 47 (2008) 34, H52-61}, doi = {http://dx.doi.org/10.1364/AO.47.000H52}, pages = {H52 -- H61}, year = {2008}, abstract = {Irradiance during total lunar eclipses is simulated using a pinhole model. The Moon is illuminated by direct sunlight that is refracted into the Earth's shadow as it passes through the atmosphere at the terminator but is depleted by scattering by molecules, extinction by aerosol particles, absorption by ozone, and obstruction by clouds and elevated land. On a spherical, sea-level Earth, and a cloudless, molecular atmosphere with no ozone, the eclipsed Moon appears red and calculated irradiance at the center of the umbra is reduced by a factor of about 2400 from direct moonlight. Selective absorption mainly of light around 600 nm by stratospheric ozone turns the periphery of the umbra pale blue. Typical distributions of aerosol particles, ozone, mountains, and clouds around the terminator reduce irradiance by an additional factor of the order of 100. © 2008 Optical Society of America}, language = {en} } @article{GedzelmanVollmer2008, author = {Gedzelman, Stanley David and Vollmer, Michael}, title = {Simulating irradiance and color during lunar eclipses using satellite data}, series = {In: Applied Optics 47 (2008) 34, pp. H149-H156}, journal = {In: Applied Optics 47 (2008) 34, pp. H149-H156}, doi = {http://dx.doi.org/10.1364/AO.47.00H149}, pages = {H149 -- H156}, year = {2008}, abstract = {Irradiance and color during the total lunar eclipses of 2007 and 2008 are simulated using a ray tracing model that includes refraction, scattering by molecules, and observed or climatological distributions of aerosols, ozone, clouds, and topography around the terminator. Central portions of the umbra appear deep red for almost all eclipses due to preferential removal of short wavelengths in the spectrum of sunlight by scattering in the lower troposphere. The fringe of the umbra appears turquoise or blue due to selective removal of wavelengths around 600 nm by the Chappuis absorption bands of ozone in the stratosphere. Asymmetric distributions of clouds and aerosols, particularly for the 2008 eclipse, produce minimum calculated irradiance up to 17  arc min from the umbra center, while high ozone content over the arctic makes the northern edge of the umbra deepest blue. © 2008 Optical Society of America}, language = {en} } @article{HernitschekSchmidtVollmer2008, author = {Hernitschek, Nina and Schmidt, Elmar and Vollmer, Michael}, title = {Lunar eclipse photometry: absolute luminance measurements and modeling}, series = {In: Applied optics 47 (2008) 34, pp. H62-H71}, journal = {In: Applied optics 47 (2008) 34, pp. H62-H71}, doi = {10.1364/AO.47.000H62}, pages = {H62 -- H71}, year = {2008}, abstract = {The Moon's time-dependent luminance was determined during the 9 February 1990 and 3 March 2007 total lunar eclipses by using calibrated, industry standard photometers. After the results were corrected to unit air mass and to standard distances for both Moon and Sun, an absolute calibration was accomplished by using the Sun's known luminance and a pre-eclipse lunar albedo of approximately 13.5\%. The measured minimum level of brightness in the total phase of both eclipses was relatively high, namely -3.32 mvis and -1.7 mvis , which hints at the absence of pronounced stratospheric aerosol. The light curves were modeled in such a way as to let the Moon move through an artificial Earth shadow composed of a multitude of disk and ring zones, containing a relative luminance data set from an atmospheric radiative transfer calculation. © 2008 Optical Society of America}, language = {en} } @inproceedings{MoellmannPinnoVollmer2007, author = {M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {Influence of wind effects on thermal imaging results - Is the wind chill effect relevant ?}, series = {In: InfraMation proceedings Vol. 8 (2007), 21-31}, booktitle = {In: InfraMation proceedings Vol. 8 (2007), 21-31}, pages = {21 -- 31}, year = {2007}, language = {en} } @article{GedzelmanVollmer2008, author = {Gedzelman, Stanley David and Vollmer, Michael}, title = {Atmospheric Optical Phenomena and Radiative Transfer}, series = {In: Bulletin of the American Meteorological Society. 89 (2008) 4, 471-485}, journal = {In: Bulletin of the American Meteorological Society. 89 (2008) 4, 471-485}, doi = {10.1175/BAMS-89-4-471}, pages = {471 -- 485}, year = {2008}, abstract = {We present simple radiative transfer models for the radiance and color of atmospheric optical phenomena. Skylight, halos, and rainbows are treated as singly scattered sunlight that is depleted by scattering as it passes through a plane-parallel atmosphere and a vertical rain shaft or a geometrically thin cloud layer. Skylight in a molecular atmosphere grades from deep blue at the zenith to pale blue near the horizon whenever the solar zenith angle sun ≤ 80°. Skylight near the horizon is orange resulting from wavelength-dependent scattering by air molecules and aerosol particles through a long oblique path through the atmosphere when the sun is low in the sky (sun ≥ 85°). Halos (and coronas) seen through clouds facing the sun are brightest for cloud optical depth τcld ≈ cos(sun), and fade to obscurity for τcld ≥ 5. Rainbows (and glories), seen by light that is backscattered from clouds, also appear most dramatic when 0.2 ≤ τcld ≤ 1, but remain visible even in the thickest clouds.}, language = {en} } @article{Vollmer2005, author = {Vollmer, Michael}, title = {Effects of absorbing particles on coronas and glories}, series = {In: Applied optics 44 (2005) 27, 5658-5666}, journal = {In: Applied optics 44 (2005) 27, 5658-5666}, doi = {10.1364/AO.44.005658}, pages = {5658 -- 5666}, year = {2005}, abstract = {Light scattering from small particles changes if the particles are absorbing. Whereas the effect is small for coronas and Bishop's ring, glories show pronounced attenuation with increasing absorption. Results indicate suitable wavelength regions for studies of glory scattering from cloud tops. The behavior of core-shell particles could have applications for studying the atmosphere of Venus; in addition it provides more insight into the simple ray-path model of the glory. © 2005 Optical Society of America}, language = {en} } @inproceedings{ChristmannVollmer2004, author = {Christmann, S. and Vollmer, Michael}, title = {Jahrgangs{\"u}bergreifendes Projekt zum Wetter f{\"u}r die Grundschule}, series = {In: Didaktik der Physik : Beitr{\"a}ge zur Fr{\"u}hjahrstagung D{\"u}sseldorf 2004 ; CD zur Fr{\"u}hjahrstagung des Fachverbandes Didaktik der Physik in der Deutschen Physikalischen Gesellschaft / V. Nordmeier ... (Hrsg.). - Berlin : Lehmanns Media, 2004. - 1 CD-ROM. - ISBN 3-86541-066-9}, booktitle = {In: Didaktik der Physik : Beitr{\"a}ge zur Fr{\"u}hjahrstagung D{\"u}sseldorf 2004 ; CD zur Fr{\"u}hjahrstagung des Fachverbandes Didaktik der Physik in der Deutschen Physikalischen Gesellschaft / V. Nordmeier ... (Hrsg.). - Berlin : Lehmanns Media, 2004. - 1 CD-ROM. - ISBN 3-86541-066-9}, year = {2004}, language = {de} } @article{GedzelmanVollmer2011, author = {Gedzelman, Stanley David and Vollmer, Michael}, title = {Crepuscular rays: laboratory experiments and simulations}, series = {In: Applied Optics Vol. 50 (2011) 28, pp. F142-F151}, journal = {In: Applied Optics Vol. 50 (2011) 28, pp. F142-F151}, doi = {http://dx.doi.org/10.1364/AO.50.00F142}, year = {2011}, abstract = {Model simulations of laboratory-generated and natural crepuscular rays are presented. Rays are created in the laboratory with parallel light beams that pass through artificial fogs and milk-water solutions. Light scattered by 90° in a dilute mixture of whole milk first increases in intensity with distance from the source to a maximum as a result of multiple scattering by mainly small angles before decreasing exponentially due to extinction as distance continues to increase. Crepuscular rays are simulated for three cloud configurations. In case 1, the Sun at the zenith is blocked by a cloud with an overhanging anvil. The rays appear white against blue sky and are brightest when atmospheric turbidity, β≈11 . Shading by the anvil separates maximum brightness from apparent cloud edge. In case 2, a ray passes through a rectangular gap in a cloud layer. The ray is faint blue in a molecular atmosphere but turns pale yellow as β and solar zenith angle, ϕsun , increase. At ϕsun=60° it appears most striking when the cloud is optically thick, β≈5 , and the beam width Δx≈1000 m . In these cases, increasing aerosol radius, raer , to about 1000 nm brightens, narrows, and shortens rays. In case 3, the twilight Sun is shaded by a towering cloud or mountain. The shaded rays are deeper blue than the sunlit sky because the light originates higher in the atmosphere, where short waves have suffered less depletion from scattering. The long optical path taken by sunlight at twilight makes color and lighting contrasts of the rays greatest when the air is quite clean, i.e., for β-1≪1 . In all cases, the brightest rays occur when sunlight passes through an optical thickness of atmosphere, τ≈O(1) . © 2011 Optical Society of America}, language = {en} } @article{VollmerMoellmann2011, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Rainbows, water droplets, and seeing—slow motion analysis of experiments in atmospheric optics}, series = {In: Applied optics Vol. 50 (2011) 28, pp. F21-F28}, journal = {In: Applied optics Vol. 50 (2011) 28, pp. F21-F28}, doi = {http://dx.doi.org/10.1364/AO.50.000F21}, pages = {F21 -- F28}, year = {2011}, abstract = {Many physics processes underlying phenomena in atmospheric optics happen on a rather short time scale such that neither the human eye nor video cameras are able to analyze the details. We report applications of high-speed imaging of laboratory experiments in atmospheric optics with subsequent slow motion analysis. The potential to study respective transient effects is investigated in general and for a few phenomena in detail, in particular for rainbow scattering due to single oscillating droplets during free fall, and for light propagation effects through atmospheric paths with turbulences, leading, e.g., to scintillation of stars or shimmering of mirage images. © 2011 Optical Society of America}, language = {en} } @inproceedings{VollmerPinnoMoellmann2010, author = {Vollmer, Michael and Pinno, Frank and M{\"o}llmann, Klaus-Peter}, title = {Measurements of sun and moon with IR cameras: effects of air mass}, series = {In: InfraMation proceedings. - Vol. 11 ( 2010) , 57-74}, booktitle = {In: InfraMation proceedings. - Vol. 11 ( 2010) , 57-74}, pages = {74}, year = {2010}, 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} } @inproceedings{PinnoVollmerMoellmann2010, author = {Pinno, Frank and Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Improved sensitivity for blower door thermography using image subtraction}, series = {In: InfraMation proceedings. - Vol. 11 (2010), p. 29-40}, booktitle = {In: InfraMation proceedings. - Vol. 11 (2010), p. 29-40}, pages = {29 -- 40}, year = {2010}, language = {en} } @inproceedings{VollmerMoellmann2010, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {New book on IR imaging: the ultimate resource for all users}, series = {In: InfraMation proceedings. - Vol. 11 (2010), pp 75-80}, booktitle = {In: InfraMation proceedings. - Vol. 11 (2010), pp 75-80}, pages = {75 -- 80}, year = {2010}, language = {en} } @inproceedings{VollmerMoellmann2009, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {IR imaging of gases: potential applications for CO2 cameras}, series = {In: InfraMation proceedings. - Vol. 10 (2009), p.113-124}, booktitle = {In: InfraMation proceedings. - Vol. 10 (2009), p.113-124}, pages = {113 -- 124}, year = {2009}, language = {en} } @inproceedings{VollmerMoellmann2009, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {IR imaging of gases: quantitative analysis}, series = {In: InfraMation proceedings. - Vol. 10 (2009), p. 99-112}, booktitle = {In: InfraMation proceedings. - Vol. 10 (2009), p. 99-112}, pages = {99 -- 112}, year = {2009}, language = {en} } @inproceedings{VollmerVujkovićTrelluetal.2009, author = {Vollmer, Michael and Vujković, M. and Trellu, Y. and M{\"o}llmann, Klaus-Peter}, title = {IR feedback loops to spotlights: thermography and contemporary dancing}, series = {In: InfraMation proceedings.- Vol. 10 (2009), p. 89-97}, booktitle = {In: InfraMation proceedings.- Vol. 10 (2009), p. 89-97}, pages = {89 -- 97}, year = {2009}, language = {en} } @inproceedings{PinnoMoellmannVollmer2009, author = {Pinno, Frank and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Solar load and reflection effects and respective time constants in outdoor building inspections}, series = {In: Inframation proceedings Vol. 10 (2009), 319-330}, booktitle = {In: Inframation proceedings Vol. 10 (2009), 319-330}, pages = {319 -- 330}, year = {2009}, language = {en} } @article{MoellmannVollmer2000, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Eine etwas andere, physikalische Sehweise - Visualisierung von Energieumwandlungen und Strahlungsphysik f{\"u}r die (Hochschul-)lehre}, series = {In: Physikalische Bl{\"a}tter 56 (2000) 9, 65-69}, journal = {In: Physikalische Bl{\"a}tter 56 (2000) 9, 65-69}, doi = {10.1002/phbl.20000560915}, pages = {65 -- 69}, year = {2000}, abstract = {Max Planck legte 1900 mit dem nach ihm benannten Strahlungsgesetz das quantitative Fundament zu so genannten W{\"a}rmebildsystemen. 100 Jahre sp{\"a}ter gibt es — mit bedingt durch Fortschritte in der Halbleitertechnologie und Mikrosystemtechnik — Infrarotkameras, mit denen sowohl die von Planck untersuchten Strahlungsgesetze zur Hohlraumstrahlung als auch allgemein wissenschaftliche und technische Anwendungen der Temperaturstrahlung von K{\"o}rpern untersucht werden k{\"o}nnen. Dar{\"u}ber hinaus bieten sich solche Systeme auch f{\"u}r didaktische Zwecke an, da physikalische Gesetzm{\"a}ßigkeiten mit Energieaustauschprozesssen aus sehr vielen Gebieten der Physik durch eine etwas andere, physikalische Sehweise visualisiert und damit f{\"u}r Lehrzwecke eingesetzt werden k{\"o}nnen.}, language = {de} } @article{MoellmannVollmer2000, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Zauberei, Diffusion, industrielle Messtechnik und 100 Jahre Quantentheorie : Einige Freihandexperimente zur Optik und W{\"a}rmestrahlung}, series = {In: Physik in der Schule 38 (2000) 4, 260-262}, journal = {In: Physik in der Schule 38 (2000) 4, 260-262}, pages = {260 -- 262}, year = {2000}, language = {de} } @article{Vollmer2000, author = {Vollmer, Michael}, title = {Unschuldige Schule! : In den vergangenen Jahren hat zwar die Zahl der Physikstudenten dramatisch abgenommen, nicht aber die Zahl der Sch{\"u}ler, die in der Oberstufe Physik w{\"a}hlen}, series = {In: Physikalische Bl{\"a}tter 56 (2000) 6, 21-22}, journal = {In: Physikalische Bl{\"a}tter 56 (2000) 6, 21-22}, doi = {10.1002/phbl.20000560606}, pages = {21 -- 22}, year = {2000}, language = {de} } @article{Vollmer1999, author = {Vollmer, Michael}, title = {Physikalische Texte zum Thema Atmosph{\"a}rische Optik}, series = {In: Meteorologischer Kalender 2000(1999)}, journal = {In: Meteorologischer Kalender 2000(1999)}, year = {1999}, language = {de} } @article{Vollmer2000, author = {Vollmer, Michael}, title = {Das ist ein seltsam wunderbares Zeichen! Ein Streifzug durch die Kulturgeschichte des Regenbogens}, series = {In: Naturwissenschaftliche Rundschau 53 (2000), 497 - 511}, journal = {In: Naturwissenschaftliche Rundschau 53 (2000), 497 - 511}, pages = {497 -- 511}, year = {2000}, language = {de} } @article{Vollmer2000, author = {Vollmer, Michael}, title = {Nach der Sonnenfinsternis in Deutschland: ein Nachschlag und Ausblick (auch) f{\"u}r die Schule}, series = {In: Physik in der Schule 38 (2000) 1, 50-54}, journal = {In: Physik in der Schule 38 (2000) 1, 50-54}, pages = {50 -- 54}, year = {2000}, language = {de} } @article{KarstaedtPinnoMoellmannetal.1999, author = {Karst{\"a}dt, Detlef and Pinno, Frank and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Anschauliche W{\"a}rmelehre im Unterricht : ein Beitrag zur Visualisierung thermischer Vorg{\"a}nge}, series = {In:: Praxis der Naturwissenschaften / Physik 48 (1999) 5, 24-31}, journal = {In:: Praxis der Naturwissenschaften / Physik 48 (1999) 5, 24-31}, pages = {24 -- 31}, year = {1999}, language = {de} } @article{VollmerMoellmann1999, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Beispiele physikalischer Freihand- und Low-Cost-Experimente in der Schule}, series = {In: Physik in der Schule 37 (1999) 5, 332-336}, journal = {In: Physik in der Schule 37 (1999) 5, 332-336}, pages = {332 -- 336}, year = {1999}, language = {de} } @article{Vollmer1999, author = {Vollmer, Michael}, title = {Motivation und Stellenwert physikalischer Freihand- und Low-Cost-Experimente in der Schule}, series = {In: Physik in der Schule 37 (1999) 3, 187-192}, journal = {In: Physik in der Schule 37 (1999) 3, 187-192}, pages = {187 -- 192}, year = {1999}, language = {de} } @article{Vollmer1998, author = {Vollmer, Michael}, title = {Gespiegelt in besondern D{\"u}ften …: Oasen, Seeungeheuer und weitere Spielereien der Fata Morgana}, series = {In: Physikalische Bl{\"a}tter 54 (1998) 10, 903-909}, journal = {In: Physikalische Bl{\"a}tter 54 (1998) 10, 903-909}, doi = {.1002/phbl.19980541006}, pages = {903 -- 909}, year = {1998}, abstract = {„Wer die Natur liebt, der braucht das Beobachten ihrer Erscheinungen wie die Luft zum Atmen." — So formulierte Marcel Minnaert das Bed{\"u}rfnis der Naturbeobachtung im Vorwort seines ber{\"u}hmten Buchs „Licht und Farbe in der Natur" [1]. Bekannte Beispiele f{\"u}r Naturerscheinungen in der Atmosph{\"a}re sind Luftspiegelungen, Regenb{\"o}gen und Halos. Diese optischen Ph{\"a}nomene bieten nicht nur faszinierende Anblicke, sondern beinhalten auch gen{\"u}gend Aspekte f{\"u}r eine interessante Physik (z. B. [2]). — Der vorliegende Artikel geht von grundlegenden physikalischen Betrachtungen aus und zeigt, daß sich alle Ph{\"a}nomene atmosph{\"a}rischer Optik {\"u}bersichtlich klassifizieren lassen. Luftspiegelungen werden exemplarisch im Detail behandelt. Viele n{\"u}tzliche Informationen findet man in Standardwerken [1, 3-5]; den aktuellen Stand der Forschung in Konferenzberichten, z. B. [6].}, language = {de} } @incollection{PlattVollmerPfeilsticker2012, author = {Platt, Ulrich and Vollmer, Michael and Pfeilsticker, Klaus}, title = {Optical Phenomena in the Atmosphere}, series = {In: Springer handbook of lasers and optics : with 163 tables / Tr{\"a}ger (ed.). - 2. ed. - Berlin : Springer, 2012. - ISBN 978-3-642-19408-5}, booktitle = {In: Springer handbook of lasers and optics : with 163 tables / Tr{\"a}ger (ed.). - 2. ed. - Berlin : Springer, 2012. - ISBN 978-3-642-19408-5}, pages = {1493 -- 1517}, year = {2012}, language = {en} } @incollection{PlattPfeilstickerVollmer2007, author = {Platt, Ulrich and Pfeilsticker, Klaus and Vollmer, Michael}, title = {Radiation and Optics in the Atmosphere}, series = {In: Springer handbook of lasers and optics / Tr{\"a}ger (ed.). - New York : Springer, 2007 ISBN 978-0-387-95579-7}, booktitle = {In: Springer handbook of lasers and optics / Tr{\"a}ger (ed.). - New York : Springer, 2007 ISBN 978-0-387-95579-7}, pages = {1165 -- 1203}, year = {2007}, language = {en} } @incollection{Vollmer1997, author = {Vollmer, Michael}, title = {Optical Spectroscopy of Metal Clusters}, series = {In: Atomic physics methods in modern research : selection of papers dedicated to Gisbert zu Putlitz on the occasion of his 65th birthday / K. Jungmann ... (ed.). - Berlin [u.a.] : Springer, 1997. - (Lecture notes in physics ; 499) ISBN 3-540-63716-8}, booktitle = {In: Atomic physics methods in modern research : selection of papers dedicated to Gisbert zu Putlitz on the occasion of his 65th birthday / K. Jungmann ... (ed.). - Berlin [u.a.] : Springer, 1997. - (Lecture notes in physics ; 499) ISBN 3-540-63716-8}, pages = {311 -- 334}, year = {1997}, language = {en} } @article{HoheiselVollmerTraeger1993, author = {Hoheisel, W. and Vollmer, Michael and Tr{\"a}ger, F.}, title = {Laserdesorption von Metallatomen}, series = {In: Physikalische Bl{\"a}tter 49 (1993) 9, 795 - 799}, journal = {In: Physikalische Bl{\"a}tter 49 (1993) 9, 795 - 799}, doi = {10.1002/phbl.19930490909}, year = {1993}, abstract = {Beleuchtet man die Oberfl{\"a}che eines Festk{\"o}rpers mit Laserlicht, k{\"o}nnen darauf adsorbierte Atome oder Molek{\"u}le abgel{\"o}st werden. Solche Desorptionsprozesse sind in j{\"u}ngster Zeit in zahlreichen Experimenten untersucht worden, wobei sich das Interesse sowohl auf die Erforschung der zugrundeliegenden Mechanismen als auch auf m{\"o}gliche Anwendungen dieser Reaktionen, zum Beispiel zur gezielten Modifizierung von Oberfl{\"a}chen, konzentriert. Besonders interessant ist das laserinduzierte Aufbrechen von Bindungen zur Oberfl{\"a}che dann, wenn es nicht einfach als thermischer Prozeß durch eine Temperaturerh{\"o}hung hervorgerufen wird, sondern direkt auf einer elektronischen Anregung beruht. Solche nichtthermischen Prozesse werden selbst f{\"u}r Metalle beobachtet, obwohl die Kopplung der elektronischen Anregung an das Substrat hier besonders schnell abl{\"a}uft. Der zugrundeliegende Mechanismus beruht auf dem Zusammenspiel einer kollektiven Elektronenoszillation und einer lokalisierten Einzelelektronenanregung, wobei auch nichtlokale optische Effekte in der Metalloberfl{\"a}che eine wichtige Rolle spielen.}, language = {de} } @inproceedings{PinnoMoellmannVollmer2012, author = {Pinno, Frank and M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Dark colors of building walls - thermal problems due to solar load}, series = {In: InfraMation proceedings. - Vol. 13 (2012)}, booktitle = {In: InfraMation proceedings. - Vol. 13 (2012)}, year = {2012}, 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{VollmerMoellmannWood2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Wood, S.}, title = {Surprising warm edges associated with moisture on surfaces}, series = {In: InfraMation proceeding. - Vol. 13 (2012)}, booktitle = {In: InfraMation proceeding. - Vol. 13 (2012)}, year = {2012}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {CO2 Detektion mit IR Kameras: Grundlagen, Experimente und Anwendungen}, series = {Technisches Messen : tm 79 (2012) 1, 65-72}, journal = {Technisches Messen : tm 79 (2012) 1, 65-72}, doi = {10.1524/teme.2012.0189}, year = {2012}, abstract = {Gasdetektion mit Infrarotkameras ist eine relativ neue Anwendung. Aufgrund der industriellen Bedeutung einiger Gase wurden sensitive Kameras mit Schmalbandfiltern entwickelt. Heute gibt es kommerzielle Systeme f{\"u}r die Detektion fl{\"u}chtiger Kohlenwasserstoffe, Schwefelhexafluorid und Kohlenmonoxid. In dieser Arbeit werden Laborergebnisse der Detektion von CO2 vorgestellt und potenzielle Anwendungen diskutiert.}, language = {de} } @inproceedings{MoellmannVollmerWinburn2011, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael and Winburn, M.}, title = {Optics of glass fronts of buildings: the science of skyscraper "death rays"}, series = {InfraMation proceedings. - 12 (2011), S. 79-92}, booktitle = {InfraMation proceedings. - 12 (2011), S. 79-92}, pages = {79 -- 92}, year = {2011}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Vapour pressure and adiabatic cooling from champagne: slow motion visualization of gas thermodynamics}, series = {In: Physics Education 47 (2012) 5, 608-615}, journal = {In: Physics Education 47 (2012) 5, 608-615}, pages = {608 -- 615}, year = {2012}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Faster than g, revisited with high-speed imaging}, series = {In: European Journal of Physics 33 (2012) 5, 1277-1288}, journal = {In: European Journal of Physics 33 (2012) 5, 1277-1288}, pages = {1277 -- 1288}, year = {2012}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Low cost hands-on experiments for Physics teaching}, series = {In: Latin-American Journal of Physics Education 6 (2012) Suppl. I, pp. 3-9}, journal = {In: Latin-American Journal of Physics Education 6 (2012) Suppl. I, pp. 3-9}, issn = {1870-9095}, pages = {3 -- 9}, year = {2012}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Oscillating droplets and incompressible liquids: slow motion visualization of experiments with fluids}, series = {In: Physics Education 47 (2012), 664-679}, journal = {In: Physics Education 47 (2012), 664-679}, pages = {664 -- 679}, year = {2012}, language = {en} } @article{VollmerMoellmann2011, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Ring falling into a chain: no magic - just physics}, series = {In: The Physics Teacher 49 (2011), 335-337}, journal = {In: The Physics Teacher 49 (2011), 335-337}, pages = {335 -- 337}, year = {2011}, language = {en} } @article{VollmerMoellmann2012, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Caustic effects due to sun light reflections from skyscrapers: simulations and experiments}, series = {In : European Journal of Physics 33 (2012) 5, 1429-1455}, journal = {In : European Journal of Physics 33 (2012) 5, 1429-1455}, pages = {1429 -- 1455}, year = {2012}, language = {en} } @article{VollmerMoellmann2011, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Exploding balloons, deformed balls, strange reflections, and breaking rods: slow motion analysis of selected hands-on experiments}, series = {In: Physics Education 46 (2011) 4, p.472-485}, journal = {In: Physics Education 46 (2011) 4, p.472-485}, pages = {472 -- 485}, year = {2011}, language = {en} } @article{VollmerMoellmann2011, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {High speed—slow motion: technology of modern high speed cameras}, series = {In: Physics Education 46 (2011) 2, 191-202}, journal = {In: Physics Education 46 (2011) 2, 191-202}, doi = {10.1002/piuz.201101270}, pages = {191 -- 202}, year = {2011}, language = {en} } @article{FrankeWiekhorstNordmeierVollmeretal.2011, author = {Franke-Wiekhorst, A. and Nordmeier, V. and Vollmer, Michael and Welzel-Breuer, M. and Wodzinski, R.}, title = {Fobinet: an internet supported platform for nationwide coordination, promotion and funding of physics teacher training activities in Germany}, series = {In: Physics Education 46 (2011), 240-243}, journal = {In: Physics Education 46 (2011), 240-243}, pages = {240 -- 243}, year = {2011}, language = {en} } @article{VollmerNordmeier2009, author = {Vollmer, Michael and Nordmeier, V.}, title = {A long tradition of in-service training for physics teachers by the German Physical Society}, series = {In: International newsletter on physics education / International Commission on Physics Education, International Union of Pure and Applied Physics 58 (2009), p. 3-4}, journal = {In: International newsletter on physics education / International Commission on Physics Education, International Union of Pure and Applied Physics 58 (2009), p. 3-4}, pages = {3 -- 4}, year = {2009}, language = {en} } @article{Vollmer1999, author = {Vollmer, Michael}, title = {Naturwissenschaftler auf Banknoten}, series = {In: Physik in unserer Zeit 30 (1999) 3, 114-117}, journal = {In: Physik in unserer Zeit 30 (1999) 3, 114-117}, doi = {10.1002/piuz.19990300305}, pages = {114 -- 117}, year = {1999}, abstract = {Portr{\"a}ts von Naturwissenschaftlern und sachliche Darstellungen aus der Physik finden sich in zahlreichen Bereichen des t{\"a}glichen Lebens, insbesondere auch auf vielen Banknoten. Die Auswahl -- vorgegeben durch die politisch inspirierte Motivwahl der Notenbanken -- stellt eine interessante Reise durch die Wissenschaftsgeschichte dar.}, language = {de} } @article{Vollmer2001, author = {Vollmer, Michael}, title = {Strahlungsgesetz und Augenempfindlichkeit: Bemerkungen zu einer klassischen Fehlinterpretation}, series = {In: Der mathematische und naturwissenschaftliche Unterricht : MNU 54 (2001) 4, 196-200}, journal = {In: Der mathematische und naturwissenschaftliche Unterricht : MNU 54 (2001) 4, 196-200}, pages = {196 -- 200}, year = {2001}, language = {de} } @article{Vollmer1997, author = {Vollmer, Michael}, title = {Der Regenbogen : Vorschlag zur Gestaltung einer interdisziplin{\"a}ren Unterrichtseinheit}, series = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 7, 36-38}, journal = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 7, 36-38}, pages = {36 -- 38}, year = {1997}, language = {de} } @article{VollmerVollmer1997, author = {Vollmer, J. and Vollmer, Michael}, title = {Am Himmel geschehen Zeichen und Wunder : Aberglauben und Bauernregeln bei optischen Erscheinungen der Atmosph{\"a}re}, series = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 3, 31-37}, journal = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 3, 31-37}, pages = {31 -- 37}, year = {1997}, language = {de} } @article{TammerTraenkleKarstaedtetal.1997, author = {Tammer, R. and Tr{\"a}nkle, E. and Karst{\"a}dt, Detlef and Vollmer, Michael}, title = {Spektakel bei Sonnenschein : Lichts{\"a}ulen, Sonnenhunde und und und ...}, series = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 3, 24-30}, journal = {In: Praxis der Naturwissenschaften / Physik 46 (1997) 3, 24-30}, pages = {24 -- 30}, year = {1997}, language = {de} }