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8. Active instability control: feedback of combustion instabilities on the injection of gaseous fuel

Author

Auer, M.P., Gebauer, C., Mosl, K.G., Hirsch, C., and Sattelmayer, T.

Subjects
Combustion -- Research, Gas as fuel -- Usage, Engineering and manufacturing industries, Science and technology
Abstract

Modern low-emission premix combustion systems are often susceptible to combustion instabilities. Active instability control (AIC) systems are commonly used to attenuate these oscillations. For the control authority of AIC systems the effective amplitude and phase of the fuel modulation at the fuel outlet are as critical as the proper injection position. In typical cases the modulation of the fuel at the location of the actuator can be fundamentally different in amplitude and phase from the modulation of the fuel flow at the fuel outlet. In addition to the well-known effects stemming from the acoustics and Mach number of the fuel system, the fuel flow in the fuel system is also modulated by the oscillation of the pressure in the combustor in case of combustion instabilities. The superposition of the upstream modulation by the actuator and the modulation downstream by the combustion instability can result in an unexpected behavior of the fuel injection, from total compensation of the modulation to very high oscillations in the resonant case, accompanied by drastic phase shifts. This paper describes the influence of the secondary fuel modulation because of the combustion instability on the control authority of AlC systems on the basis of theoretical considerations and measurements for an atmospheric test rig with a natural gas-fired swirl burner [DOI: 10.1115/1.1924718]

Published
2005

10. Effect of the IrOx Conductivity on the Anode Electrode/Porous Transport Layer Interfacial Resistance in PEM Water Electrolyzers.

Author

Bernt, M., Schramm, C., Schröter, J., Gebauer, C., Byrknes, J., Eickes, C., and Gasteiger, H. A.

Subjects
CATALYSTS, INTERFACIAL resistance, ELECTROLYTIC cells, ELECTRIC conductivity, ELECTRODE performance, OXYGEN evolution reactions, PLATINUM nanoparticles, OHMIC contacts
Abstract

In this study, a commercial IrO2/TiO2 catalyst (75 wt% Ir, named "Benchmark") for the oxygen evolution reaction (OER) is compared to a newly developed IrO(OH)x/TiO2 catalyst (45 wt% Ir, named "P2X"). Due to its lower Ir packing density and higher OER activity vs the Benchmark catalyst (440 vs 12 A gIr-1 at 1.43 ViR-free), the P2X catalyst shows an improved PEM (proton exchange membrane) water electrolyzer performance at ≈9 times reduced Ir loading, however, only if a platinum-coated porous transport layer (PTL) at the anode is used. While the performance of membrane electrode assemblies (MEAs) with the Benchmark catalyst is unaffected when using an untreated titanium PTL, MEAs with the P2X catalyst perform poorly, which can be attributed to a contact resistance at the anode/PTL interface due to the low electrical conductivity of the P2X catalyst (0.7 S cm-1) vs the Benchmark catalyst (416 S cm-1) and the passivation of the Ti-PTL. A heat treatment procedure is used to transform the amorphous IrO(OH)x of the P2X catalyst into crystalline IrOx and, hence, increases its electrical conductivity. The optimum temperature for heat treatment to maximize electrical conductivity, OER activity and MEA performance will be evaluated. [ABSTRACT FROM AUTHOR]

Published
2021
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11. Neurobiologie der Dissoziation

Author

Gebauer, C, Daniels, Judith, Thiel, Freya, Spitzer, Carsten, and Experimental Psychotherapy & Psychopathology

Abstract

Dissoziation ist ein Prozess der Desintegration des Bewusstseins, der Identität, des Gedächtnisses und der Wahrnehmung, der vermutlich durch vielfältige neuronale und physiologische Anpassungen charakterisiert ist. Aber was passiert eigentlich genau, wenn sich die Wahrnehmung plötzlich verändert, die Zeit sehr langsam dahinfließt oder Schmerzen kaum noch wahrgenommen werden? Im Folgenden werden die bisherigen Erkenntnisse zu strukturellen und funktionellen Veränderungen zusammengefasst.

Published
2017

15. Cervikale Lymphknotenschwellung mit obstruktiver Schlafapnoe und Nachweis von atypischen Mykobakterien – komplizierte Diagnose, komplizierte Therapie

Author

Bigl, A, Gebauer, C, Quante, M, Mozet, C, Pulzer, F, Hirsch, W, and Schuster, V

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Wir berichten über ein 2-jähriges Mädchen, welches sich mit einer massiven Lymphknotenschwellung, ausgeprägtem Schnarchen und Atemaussetzern in unserer infektiologischen Sprechstunde vorstellte. Eine Infektion mit EBV, CMV, Bartonellae und Toxoplasmose konnte ausgeschlossen werden.[for full text, please go to the a.m. URL], 21. Jahrestagung der Deutschen Gesellschaft für Pädiatrische Infektiologie (DGPI)

Published
2013
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16. Verdacht auf eine latente Tuberkulose bei Z.n. intrabdominellem, granulierendem Tumor - eine diagnostische und therapeutische Herausforderung

Author

Bigl, Arndt, Gebauer, C., Mayer, Steffi, Till, Holger, Sack, U., Magdorf, Klaus, and Schuster, Volker

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Wir berichten über einen 16jährigen Jugendlichen, der sich initial in unserer kinderchirurgischen Ambulanz mit seit ca. 6 Monaten bestehenden Schmerzen im linken Unterbauch vorstellte. In der durchgeführten Abdomensonographie zeigte sich eine 5,7 x 2,5 x 2cm große dem linken M. iliopsoas[for full text, please go to the a.m. URL], 20. Jahrestagung der Deutschen Gesellschaft für Pädiatrische Infektiologie (DGPI)

Published
2012

24. Associations between BMI and the FTO gene are age dependent: results from the GINI and LISA birth cohort studies up to age 6 years

Author

Rzehak, P., Scherag, A., Grallert, H., Sausenthaler, S., Koletzko, S., Bauer, C.P., Schaaf, B., von Berg, A., Berdel, D., Borte, M., Herbarth, O., Krämer, U., Illig, T., Wichmann, H.-E., Hebebrand, J., Heinrich, J., Schoetzau, A., Popescu, M., Mosetter, M., Schindler, J., Franke, K., Laubereau, B., Thaqi, A., Zirngibl, A., Zutavern, A., Filipiak, B., Gehring, U., Albrecht, B., Baumgart, A., Bollrath, C., Büttner, S., Diekamp, S., Gross, I., Jakob, T., Klemke, K.K., Kurpiun, K.S., Möllermann, M., Neusüss, J., Varhelyi, A., Zorn, C., Reinhard, D., Weigand, H., Antonie, I., Bäumler-Merl, B., Tasch, C., Göhlert, R., Sönnichsen, C., Grübl, A., Bartels, P., Brockow, I., Hoffmann, U., Lötzbeyer, F., Mayrl, R., Negele, K., Schill, E.M., Wolf, B., Link, E., Sugiri, D., Ranft, U., Bolte, G., Belcredi, P., Jacob, B., Höhnke, A., Schulz, R., Sierig, G., Mirow, K., Gebauer, C., Schulze, B., Hainich, J., Sack, U., Emmrich, F., Scholten, C., Diez, U., Rehwagen, Martina, Schlink, Uwe, Franck, Ulrich, Jorks, A., Röder, Stefan, Lehmann, Irina, Herberth, Gunda, Daegelmann, Clarissa, Weiss, M., Albert, M., Fahlbusch, B., Bischof, W., Koch, A., Schins, R., Ring, J., Grosch, J., Weidinger, S., Rzehak, P., Scherag, A., Grallert, H., Sausenthaler, S., Koletzko, S., Bauer, C.P., Schaaf, B., von Berg, A., Berdel, D., Borte, M., Herbarth, O., Krämer, U., Illig, T., Wichmann, H.-E., Hebebrand, J., Heinrich, J., Schoetzau, A., Popescu, M., Mosetter, M., Schindler, J., Franke, K., Laubereau, B., Thaqi, A., Zirngibl, A., Zutavern, A., Filipiak, B., Gehring, U., Albrecht, B., Baumgart, A., Bollrath, C., Büttner, S., Diekamp, S., Gross, I., Jakob, T., Klemke, K.K., Kurpiun, K.S., Möllermann, M., Neusüss, J., Varhelyi, A., Zorn, C., Reinhard, D., Weigand, H., Antonie, I., Bäumler-Merl, B., Tasch, C., Göhlert, R., Sönnichsen, C., Grübl, A., Bartels, P., Brockow, I., Hoffmann, U., Lötzbeyer, F., Mayrl, R., Negele, K., Schill, E.M., Wolf, B., Link, E., Sugiri, D., Ranft, U., Bolte, G., Belcredi, P., Jacob, B., Höhnke, A., Schulz, R., Sierig, G., Mirow, K., Gebauer, C., Schulze, B., Hainich, J., Sack, U., Emmrich, F., Scholten, C., Diez, U., Rehwagen, Martina, Schlink, Uwe, Franck, Ulrich, Jorks, A., Röder, Stefan, Lehmann, Irina, Herberth, Gunda, Daegelmann, Clarissa, Weiss, M., Albert, M., Fahlbusch, B., Bischof, W., Koch, A., Schins, R., Ring, J., Grosch, J., and Weidinger, S.

Abstract

Objective: The association between polymorphisms in intron 1 of the fat mass and obesity associated gene (FTO) and obesity-related traits is one of the most robust associations reported for complex traits and is established both in adults and children. However, little is known about the longitudinal dynamics of these polymorphisms on body mass index (BMI), overweight, and obesity. Methods: This study is based on the 2,732 full-term neonates of the German GINI-plus and LISA-plus birth cohorts, for whom genotyping data on the *Both authors contributed equally to this paper **For list of study group members see acknowledgement section FTO variants rs1558902 (T>A) or rs9935401 (G>A) were available. Children were followed from birth up to age 6 years. Up to 9 anthropometric measurements of BMI were obtained. Fractional-Polynomial-GeneralizedEstimation-Equation modeling was used to assess developmental trends and their potential dependence on genotype status. Results: We observed no evidence for BMI differences between genotypes of both variants for the first 3 years of life. However, from age 3 years onwards, we noted a higher BMI for the homozygous minor alleles carriers in comparison to the other two genotype groups. However, evidence for statistical significance was reached from the age of 4 years onwards. Conclusions: This is one of the first studies investigating in detail the development of BMI depending on FTO genotype between birth and the age of 6 years in a birth cohort not selected for the phenotype studied. We observed that the association between BMI and FTO genotype evolves gradually and becomes descriptively detectable from the age of 3 years onwards.

Published
2010

30. Genetic risk factors for obesity (MAF MC4R and FTO-polymorphisms) in a large cohort of German VLBW infants

Author

Haller, S, primary, Gebauer, C, additional, Küster, H, additional, Teig, N, additional, Müller, D, additional, Segerer, H, additional, Nikischin, W, additional, Roth, B, additional, Höhn, T, additional, Wense, A von der, additional, Kattner, E, additional, Möller, J, additional, Vochem, M, additional, Wieg, C, additional, Härtel, C, additional, Herting, E, additional, and Göpel, W, additional

Published
2010
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33. Surfactant without Intubation in Preterm Infants with Respiratory Distress: First Multi-center Data

Author

Kribs, A., primary, Härtel, C., additional, Kattner, E., additional, Vochem, M., additional, Küster, H., additional, Möller, J., additional, Müller, D., additional, Segerer, H., additional, Wieg, C., additional, Gebauer, C., additional, Nikischin, W., additional, Wense, A., additional, Herting, E., additional, Roth, B., additional, and Göpel, W., additional

Published
2010
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34. Polymorphisms in the Renin-Angiotensin System and Outcome of Very-Low-Birthweight Infants

Author

Spiegler, J., primary, Gilhaus, A., additional, König, I.R., additional, Kattner, E., additional, Vochem, M., additional, Küster, H., additional, Möller, J., additional, Müller, D., additional, Kribs, A., additional, Segerer, H., additional, Wieg, C., additional, Nikischin, W., additional, von der Wense, A., additional, Gebauer, C., additional, Herting, E., additional, and Göpel, W., additional

Published
2009
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41. Surfactantgabe ohne Intubation: Multizentrische Daten zu Intubationsraten, Surfactantverbrauch und Begleitmedikation

Author

Göpel, W, primary, Kribs, A, additional, Spiegler, J, additional, Härtel, C, additional, Gebauer, C, additional, Wieg, C, additional, Kattner, E, additional, Küster, H, additional, Möller, J, additional, Müller, D, additional, Nikischin, W, additional, Segerer, H, additional, Vochem, M, additional, von der Wense, A, additional, Roth, B, additional, and Herting, E, additional

Published
2007
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45. Surfactantgabe ohne Intubation: Multizentrische Daten zu bronchopulmonaler Dysplasie, Hirnblutungen, Frühgeborenenretinopathie und Tod

Author

Kribs, A, primary, Göpel, W, additional, Frankenbusch, K, additional, Gebauer, C, additional, Wieg, C, additional, Kattner, E, additional, Küster, H, additional, Möller, J, additional, Nikischin, W, additional, Roth, B, additional, von der Wense, A, additional, Herting, E, additional, Segerer, H, additional, Vochem, M, additional, and Müller, D, additional

Published
2007
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