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Publikationen von Professorinnen und Professoren der HAW Hamburg

Jahr:  
Alle : 1982, ... , 2016, 2017, 2018, ... , 2020
Autor:  
Alle : A, À, B, C, D, E, F, G, H, I, J, K, L, M, N, O, Ö, P, Q, R, S, T, U, V, W, Y, Z 
Alle : W. Biersack, ... , Wetzel, Weyand, Weyhe, ... , Wöste 
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Referenzen

Zeitschriftenbeiträge:

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Bernd Baumann, Jörg Schwieger, Ulrich Stein, Sarah Hallerberg und Marcus Wolff
High-intensity discharge lamp and Duffing oscillator--Similarities and differences
Journal of Applied Physics, 122(21):16
6 Dezember 2017
E

Marker: TI-MP

Zusammenfassung: The processes inside the arc tube of high-intensity discharge lamps are investigated by finite element simulations. The behavior of the gas mixture inside the arc tube is governed by differential equations describing mass, energy and charge conservation as well as the Helmholtz equation for the acoustic pressure and the Reynolds equations for the flow driven by buoyancy and Reynolds stresses. The model is highly nonlinear and requires a recursion procedure to account for the impact of acoustic streaming on the temperature and other fields. The investigations reveal the presence of a hysteresis and the corresponding jump phenomenon, quite similar to a Duffing oscillator. The similarities and, in particular, the differences of the nonlinear behavior of the high-intensity discharge lamp to that of a Duffing oscillator are discussed. For large amplitudes the high-intensity discharge lamp exhibits a stiffening effect in contrast to the Duffing oscillator. It is speculated on how the stiffening might affect hysteresis suppression.

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Wolfgang Willaschek
Essay: Eine unaufhörliche Odyssee - Spurensicherungen historischer und theatralischer Art zu „Il ritorno d´Ulisse in patria“
Claudio Monteverdis Oper, Hamburgische Staatsooper,
November 2017

Marker: DMI-Mt

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Bernd Baumann, Jörg Schwieger, Ulrich Stein, Sarah Hallerberg und Marcus Wolff
High-Intensity Discharge Lamp and Duffing Oscillator - Similarities and Differences
arXiv,
8 Mai 2017

Marker: TI-MP

Zusammenfassung: The processes inside the arc tube of high-intensity discharge lamps are inves- tigated by finite element simulations. The behavior of the gas mixture inside the arc tube is governed by differential equations describing mass, energy and charge conservation as well as the Helmholtz equation for the acoustic pressure and the Navier-Stokes equation for the flow driven by the buoyancy and the acous- tic streaming force. The model is highly nonlinear and requires a recursion proce- dure to account for the impact of acoustic streaming on the temperature and other fields. The investigations reveal the presence of a hysteresis and the correspond- ing jump phenomenon, quite similar to a Duffing oscillator. The similarities and, in particular, the differences of the nonlinear behavior of the high-intensity dis- charge lamp to that of a Duffing oscillator are discussed. For large amplitudes the high-intensity discharge lamp exhibits a stiffening effect in contrast to the Duffing oscillator.

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Rasmus Rettig, R. Günther, T. Wenzel und M. Wegner
Big Data Driven Dynamic Driving Cycle Development for Busses in Urban Public Transportation
Transportation Research Part D: Transport and Environment, Volume 51, :276-289
März 2017

Marker: TI-IE

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Debsankha Manik, Martin Rohden, Henrik Ronellenfitsch, Xiaozhu Zhang, Sarah Hallerberg, Dirk Witthaut und Marc Timme
Network susceptibilities: Theory and applications
Physical Review E,
23 Januar 2017

Marker: TI-MP

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Johanna Buchcik, Joachim Westenhöfer, Mick Fleming und Colin R. Martin
Is Health-Related Quality of Life the same for elderly Polish migrants, Turkish migrants and German natives? Testing the reliability and construct validity of the Sf-36 Health Survey in a cross-cultural comparison.
Cogent Psychology, 4:1280984
16 Januar 2017

Schlüsselwörter: Elderly Turkish and Polish migrants; Sf-36 health survey; structural equation modelling; confirmatory factor analysis; reliability; Cronbach’s ?

Marker: LS-GW

Zusammenfassung: Objective: The Sf-36 is the most widely used instrument to measure health-related quality of life (HRQoL) with the most convincing evidence of both internal consistency and test–retest reliability. In addition, it is appropriate for use among elderly and minority groups like migrants. The aim of this study is to investigate and compare the reliability and the factorial structure of the Sf-36 in a sample of elderly migrants and natives. The hypothesis is that the construct (the HRQoL consisting of eight dimensions correlated with two components) is the same for elderly Turkish migrants, Polish migrants and German natives. This means that the Sf- 36 model shows good psychometric properties and model invariance for the three groups investigated in this study. Methods: The Sf-36 v.2 was forward and backward translated to Turkish and Polish. In this cross-sectional study, interviews were conducted with a sample of elderly migrants from Turkey (n = 100), from Poland (n = 103) and a sample of elderly German natives (n = 101). All data were entered and analysed using SPSS version 21 and AMOS Graphics. Cronbach’s ? was used to analyse the reliability of the Sf-36. Multi-group confirmatory factor analysis (MGCFA)and structural equation modelling (SEM) were used for the Sf-36 model invariance testing. Results: The reliability of the Sf-36 was good to excellent for all Sf-36 dimensions (? > 0.7) except for General Health (0.55) in the Polish group. Multi-group confirmatory factor analysis (MGCFA) showed non-invariance between the three groups (CMIN: 180.172, df: 51, CMIN/df: 3.533, p < 0.001, CFI: 0.895, RMSEA: 0.092 for the unconstrained model). Model modifications resulted in a good model fit for the Polish group. However, an applicable common Sf-36 model for the three groups was not attained. Conclusion: This study doesn’t support the idea that the factorial structure of the Sf-36 with two components and eight dimensions is the same across three ethnically and culturally diverse groups of elderly subjects. Therefore, comparing subscale scores of the Sf-36 between different ethnic groups may be problematic.

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Marcus Wolff und A. Loh
Absorption cross sections of 13C ethane and propane isotopologues in the 3 µm region
JQSRT, 203, :517-521
2017

Marker: TI-MP

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Kathrin Kirchner, Felix Reher, Rüdiger Weißbach und Robert Heinrich
Agilität in der Prozessmodellierung - Ein Beitrag zu gutem Requirements Engineering?
Sotwaretechnik-Trends, 37 (2017)(2 (Mai)):6-7
2017
ISSN: 0720-8928
deutsch

Marker: WS-W

Zusammenfassung: Beitrag zum Treffen der Fachgruppe Requirements Engineering der Gesellschafts für Informatik e.V, 25./26.11.2016, Stuttgart

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Anne Wüstner, Luise Richter, Nele Mindermann, Nadja Kartschmit, Anna Barabasch und Christine Färber
Arbeit mit geflüchteten Frauen: Herausforderungen und Bedürfnisse von Hebammen - eine Interviewstudie von Studierenden des Masterstudiengangs Health Sciences
Deutsche Hebammenzeitschrift,
2017

Marker: LS-G

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Walter Leal Filho, D. Nzengya, G. Muasya und J. Wanzuu
Climate change responses among the Maasai Community in Kenya
Climatic Change Volume 145 (Issue 1-2), :71-83
2017

Marker: LS

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Letzte Änderung: 23.01.15

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