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3. Zyklische Auslastungsgrade der FKM‐Richtlinien: Definition und Vorschlag eines effizienten Iterationsverfahrens.

Author

Fiedler, M., Weichert, J., and Rennert, R.

Subjects
*NEWTON-Raphson method, *DERIVATIVES (Mathematics), *MINERS, *DEFINITIONS
Abstract

The FKM guideline nonlinear published in 2019 does not yet contain a definition for a cyclic utilization rate in the load direction. One of the reasons is the nonlinear material behavior, which makes it difficult to calculate a utilization rate in the load direction. In order to enable the definition of a cyclic utilization rate, the cyclic utilization rate according to the FKM guideline "Analytical Strength Assessment" (FKM linear) is examined in more detail and a proposal is made for an efficient iteration procedure for the calculation of the utilization rate based on the consequent Miner rule. This iteration procedure has an accuracy comparable to that of Newton's method. Unlike FKM linear, the FKM guideline nonlinear takes nonlinear elastic‐plastic material behavior into account when calculating component fatigue lives. This results in a nonlinearity in the calculation, which makes it difficult to define an objective function for the Newton method. Currently, the user can only use interval nesting, which requires considerable computational effort. The newly introduced efficient iteration method does not require the definition of an objective function and its derivative in order to calculate the next iteration value. The introduction of the efficient iteration procedure thus allows for the first time the fast calculation of a cyclic utilization rate based on FKM guideline nonlinear. The utilization rate is therefore defined for the first time within in this paper, including a termination criterion. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Thrombotischer Verschluss der extrakorporalen Zirkulation während hepatischer Chemosaturation trotz zielgerechter Antikoagulation: Ein Fallbericht.

Author

Kuhner, M., Tan, B., Fiedler, M. O., Biecker, O., Klein, B., Chang, D. H., Weigand, M. A., and Dietrich, M.

Subjects
HEMODYNAMICS, BLOOD coagulation
Abstract

Copyright of Anaesthesist is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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35. Vitamin C und Thiamin im Septischen Schock -- Eine retrospektive Vorher-Nachher-Studie an chirurgischen Patienten.

Author

Dietrich, M., Märtens, M., von der Forst, M., Bruckner, T., Uhle, F., Fiedler, M., Weiterer, S., Hackert, T., Brenner, T., and Weigand, M. A.

Abstract

Copyright of Anaesthesiologie & Intensivmedizin is the property of DGAI e.V. - Deutsche Gesellschaft fur Anasthesiologie und Intensivmedizin e.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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40. Mikrovaskuläre Veränderungen bei COVID-19.

Author

Wagner, W. L., Hellbach, K., Fiedler, M. O., Salg, G. A., Wehrse, E., Ziener, C. H., Merle, U., Eckert, C., Weber, T. F., Stiller, W., Wielpütz, M. O., Dullin, C., Kenngott, H. G., Schlemmer, H.-P., Weigand, M. A., Schirmacher, P., Longerich, T., Kauczor, H.-U., Kommoss, F. K.-F., and Schwab, C.

Abstract

Copyright of Der Radiologe is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020
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46. High precision study of chemical relaxation in the system N2O4=2NO2 by photoacoustic resonance spectroscopy.

Author

Fiedler, M. and Hess, P.

Subjects
*RELAXATION phenomena, *PHOTOACOUSTIC spectroscopy
Abstract

The chemical relaxation of the N2O4 dissociation was studied using Ar+ laser excited acoustic resonances of a cylindrical cavity. The resonance profiles of the first radial mode were measured as a function of pressure and temperature by a computer controlled setup. The N2O4 dissociation rate constant and the mean rotational and vibrational relaxation time of the N2O4–NO2 mixture were obtained for temperatures between 273 and 317 K by fitting a detailed theoretical model of the resonator to the measured values for frequency dispersion, resonance broadening, and strength of the photoacoustic signal. Excellent agreement between theory and experiment was obtained for the frequency dispersion and the photoacoustic signal. An empirical correction function had to be introduced to account for discrepancies between the theoretically predicted and measured values of the resonance broadening which was in the percent region. A value of 6.1×10-15 cm3/molecule s was determined for the rate constant of N2O4 dissociation in the low pressure limit at 298 K. The activation energy of the N2O4 dissociation for 20 mbar pressure was determined to be EA=36 kJ/mol. A comparison of the measured low-pressure limit of the unimolecular rate constant with theoretical predictions of RRKM theory yielded values for the mean collision efficiency of N2O4 and NO2 between 0.95 and 0.5 in the temperature range 273–317 K. [ABSTRACT FROM AUTHOR]

Published
1990
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47. Total neutrino and antineutrino charged current cross section measurements in 100, 160, and 200 GeV narrow band beams

Author

Berge, P., Blondel, A., Böckmann, P., Burkhardt, H., Dydak, F., De Groot, J. G. H., Grant, A. L., Hagelberg, R., Hughes, E. W., Krasny, M., Meyer, H. J., Palazzi, P., Ranjard, F., Rothberg, J., Steinberger, J., Taureg, H., Wachsmuth, H., Wahl, H., Williams, R. W., Wotschack, J., Wysłouch, B., Blümer, H., Brummel, H. D., Buchholz, P., Duda, J., Eisele, F., Kampschulte, B., Kleinknecht, K., Knobloch, J., Müller, E., Pszola, B., Renk, B., Belusević, R., Falkenburg, B., Fiedler, M., Geiges, R., Geweniger, C., Hepp, V., Keilwerth, H., Kurz, N., Tittel, K., Debu, P., Guyot, C., Merlo, J. P., Para, A., Perez, P., Perrier, F., Rander, J., Schuller, J. P., Turlay, R., Vallage, B., Abramowicz, H., Królikowski, J., and Lipniacka, A.

Published
1987
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49. Proof of concept for an optogalvanic gas sensor for NO based on Rydberg excitations.

Author

Schmidt, J., Fiedler, M., Albrecht, R., Djekic, D., Schalberger, P., Baur, H., Löw, R., Fruehauf, N., Pfau, T., Anders, J., Grant, E. R., and Kübler, H.

Subjects
*RYDBERG states, *NITRIC oxide, *GAS mixtures, *ATMOSPHERIC pressure, *HELIUM
Abstract

We demonstrate the applicability of 2-photon Rydberg excitations of nitric oxide (NO) at room temperature in a gas mixture with helium (He) as an optogalvanic gas sensor. The charges created initially from preceding collisions of excited NO Rydberg molecules with free electrons are measured as a current on metallic electrodes inside a glass cell and amplified using a custom-designed high-bandwidth transimpedance amplifier attached to the cell. We find that this gas sensing method is capable of detecting NO concentrations lower than 10 ppm even at atmospheric pressures, currently only limited by the way we prepare gas dilutions. [ABSTRACT FROM AUTHOR]

Published
2018
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50. Beurteilung der Nierenfunktion.

Author

Huynh-Do, U., Fiedler, M., and Vogt, B.

Abstract

Copyright of Der Internist is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018
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