TY - JOUR A1 - Bergmann, Karl-Christian A1 - Klimek, Ludger A1 - Nehr, Sascha A1 - Straff, Wolfgang A1 - Werchan, Barbora T1 - Allergenic pollen: is it also an indoor problem? JF - Allergo Journal International KW - Luftreinhaltung Y1 - 2021 U6 - https://doi.org/10.1007/s40629-020-00161-3 SN - 2197-0378 VL - 30 IS - 6 SP - 207 EP - 208 PB - Springer Nature ER - TY - JOUR A1 - Bergmann, Karl-Christian A1 - Klimek, Ludger A1 - Nehr, Sascha A1 - Straff, Wolfgang A1 - Werchan, Barbora T1 - Allergene Pollen - auch ein Problem von Innenräumen? JF - Allergo Journal KW - Luftreinhaltung Y1 - 2021 U6 - https://doi.org/10.1007/s15007-021-4863-0 SN - 0941-8849 VL - 30 IS - 6 SP - 54 EP - 55 PB - Springer Nature ER - TY - JOUR A1 - Tan, Zhaofeng A1 - Hantschke, Luisa A1 - Kaminski, Martin A1 - Acir, Ismail-Hakki A1 - Bohn, Birger A1 - Cho, Changmin A1 - Dorn, Hans-Peter A1 - Li, Xin A1 - Novelli, Anna A1 - Nehr, Sascha A1 - Rohrer, Franz A1 - Tillmann, Ralf A1 - Wegener, Robert A1 - Hofzumahaus, Andreas A1 - Kiendler-Scharr, Astrid A1 - Wahner, Andreas A1 - Fuchs, Hendrik T1 - Atmospheric photo-oxidation of myrcene: OH reaction rate constant, gas-phase oxidation products and radical budgets JF - Atmospheric Chemistry and Physics N2 - Abstract. The photo-oxidation of myrcene, a monoterpene species emitted by plants, was investigated at atmospheric conditions in the outdoor simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a Large Reaction Chamber). The chemical structure of myrcene consists of one moiety that is a conjugated π system (similar to isoprene) and another moiety that is a triple-substituted olefinic unit (similar to 2-methyl-2-butene). Hydrogen shift reactions of organic peroxy radicals (RO2) formed in the reaction of isoprene with atmospheric OH radicals are known to be of importance for the regeneration of OH. Structure–activity relationships (SARs) suggest that similar hydrogen shift reactions like in isoprene may apply to the isoprenyl part of RO2 radicals formed during the OH oxidation of myrcene. In addition, SAR predicts further isomerization reactions that would be competitive with bimolecular RO2 reactions for chemical conditions that are typical for forested environments with low concentrations of nitric oxide. Assuming that OH peroxy radicals can rapidly interconvert by addition and elimination of O2 like in isoprene, bulk isomerization rate constants of 0.21 and 0.097 s−1 (T=298 K) for the three isomers resulting from the 3′-OH and 1-OH addition, respectively, can be derived from SAR. Measurements of radicals and trace gases in the experiments allowed us to calculate radical production and destruction rates, which are expected to be balanced. The largest discrepancies between production and destruction rates were found for RO2. Additional loss of organic peroxy radicals due to isomerization reactions could explain the observed discrepancies. The uncertainty of the total radical (ROx=OH+HO2+RO2) production rates was high due to the uncertainty in the yield of radicals from myrcene ozonolysis. However, results indicate that radical production can only be balanced if the reaction rate constant of the reaction between hydroperoxy (HO2) and RO2 radicals derived from myrcene is lower (0.9 to 1.6×10-11 cm3 s−1) than predicted by SAR. Another explanation of the discrepancies would be that a significant fraction of products (yield: 0.3 to 0.6) from these reactions include OH and HO2 radicals instead of radical-terminating organic peroxides. Experiments also allowed us to determine the yields of organic oxidation products acetone (yield: 0.45±0.08) and formaldehyde (yield: 0.35±0.08). Acetone and formaldehyde are produced from different oxidation pathways, so that yields of these compounds reflect the branching ratios of the initial OH addition to myrcene. Yields determined in the experiments are consistent with branching ratios expected from SAR. The yield of organic nitrate was determined from the gas-phase budget analysis of reactive oxidized nitrogen in the chamber, giving a value of 0.13±0.03. In addition, the reaction rate constant for myrcene + OH was determined from the measured myrcene concentration, yielding a value of (2.3±0.3)×10-10 cm3 s−1. KW - Luftreinhaltung Y1 - 2021 U6 - https://doi.org/10.5194/acp-21-16067-2021 SN - 1680-7324 VL - 21 IS - 20 SP - 16067 EP - 16091 PB - Copernicus GmbH ER - TY - CHAP A1 - Sturtevant, Cove A1 - Metzger, Stefan A1 - Nehr, Sascha A1 - Foken, Thomas ED - Foken, Thomas T1 - Quality Assurance and Control T2 - Springer Handbook of Atmospheric Measurements KW - quality assurance KW - quality control KW - quality management KW - calibration KW - certification KW - data quality KW - data processing KW - instrument characteristics KW - instrument requirements KW - site requirements KW - Luftreinhaltung Y1 - 2021 SN - 9783030521707 U6 - https://doi.org/10.1007/978-3-030-52171-4_3 SN - 2522-8692 SP - 49 EP - 92 PB - Springer Nature CY - Cham ER - TY - GEN A1 - Richter, Nicole T1 - Homeoffice und Führung T2 - Das Wirtschaftsstudium Y1 - 2021 SN - 0340-3084 VL - 2021 IS - 4 SP - 395 EP - 399 PB - Lange CY - Düsseldorf ER - TY - CHAP A1 - Richter, Nicole ED - Cansu, Hattula ED - Hilgers-Sekowsky, Julia ED - Schuster, Gabriele T1 - Praxisprojekte in der Lehre – ein transferorientiertes Lernkonzept T2 - Praxisorientierte Hochschullehre: Insights in innovative sowie digitale Lehrkonzepte und Kooperationen mit der Wirtschaft KW - Lerncoaching KW - Personalmanagement KW - Phasenmodell KW - Praxisprojekt KW - Transferorientiertes Lernkonzept Y1 - 2021 SN - 978-3-658-32393-6 U6 - https://doi.org/10.1007/978-3-658-32393-6 SP - 209 EP - 219 PB - Springer Fachmedien CY - Wiesbaden ER - TY - JOUR A1 - de Bánffy-Hall, Alicia A1 - Haak-Schulenburg, Marion T1 - Whose Words, Whose Values? The Tensions between Idealism and Realism in Community Mu JF - Zeitschrift für kritische Musikpädagogik Y1 - 2021 IS - 5 SP - 200 EP - 208 PB - Universität zu Köln ER - TY - RPRT A1 - de Bánffy-Hall, Alicia A1 - Haak-Schulenburg, Marion A1 - Eberhard, Daniel Mark T1 - Community Music Y1 - 2021 UR - https://miz.org/de/beitraege/community-music PB - Deutsches Musikinformationszentrum ER - TY - GEN ED - de Bánffy-Hall, Alicia ED - Eberhard, Daniel Mark ED - Ziegenmeyer, Annette T1 - Musik im Strafvollzug Y1 - 2021 SN - 978-3-8309-4407-2 PB - Waxmann CY - Münster ER - TY - THES A1 - Pohlmann, Anna-Lena T1 - Perspektiven von Beratenden auf intersektionale Diskriminierung von LSBTIQ+ Geflüchteten T3 - Hervorragende Abschlussarbeiten im Fachbereich Sozial- und Kulturwissenschaften - 116 KW - Bachelor KW - WiSe21/22 KW - Intersektionalität Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-37532 CY - Düsseldorf ER -