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819 results on '"Schneider, Dirk"'

4. The Bulgarian defence market

Author

Schneider, Dirk P.

Subjects
DEFENSE INDUSTRY AND TRADE - Bulgaria
Abstract

illus por

Published
2003

5. Ultrasound‐guided determination demonstrates influence of age, sex and type of sport on medial femoral condyle cartilage thickness in children and adolescents

Author

Schneider, Dirk, primary, Weber, Regine, additional, Nourkami‐Tutdibi, Nasenien, additional, Bous, Michelle, additional, Goedicke‐Fritz, Sybelle, additional, Hans, Muriel Charlotte, additional, Hein, Steve, additional, Wolf, Milan Anton, additional, Landgraeber, Stefan, additional, Zemlin, Michael, additional, and Kaiser, Elisabeth, additional

Published
2024
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6. Dual-Bell Nozzle Design

Author

Génin, Chloé, Schneider, Dirk, Stark, Ralf, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Editorial Board Member, Fujii, Kozo, Editorial Board Member, Haase, Werner, Editorial Board Member, Leschziner, Michael A., Editorial Board Member, Periaux, Jacques, Editorial Board Member, Pirozzoli, Sergio, Editorial Board Member, Rizzi, Arthur, Editorial Board Member, Roux, Bernard, Editorial Board Member, Shokin, Yurii I., Editorial Board Member, Mäteling, Esther, Managing Editor, Adams, Nikolaus A., editor, Radespiel, Rolf, editor, Haidn, Oskar J., editor, Sattelmayer, Thomas, editor, Stemmer, Christian, editor, and Weigand, Bernhard, editor

Published
2021
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7. Surface Pressure Measurement of Truncated, Linear Aerospike Nozzles Utilising Secondary Injection for Aerodynamic Thrust Vectoring †.

Author

Sieder-Katzmann, Jan, Propst, Martin, Stark, Ralf H., Schneider, Dirk, General, Stephan, Tajmar, Martin, and Bach, Christian

Subjects
SUPERSONIC flow, STATIC pressure, VECTOR control, PRESSURE measurement, NOZZLES
Abstract

A cold-gas test campaign has been conducted at the DLR's P6.2 test bench in Lampoldshausen, with the objective of investigating the linear aerospike nozzle flow in interaction with secondary injection thrust vector control (SITVC). In this campaign, the influence of nozzle truncation, injection position and injection pressure on the nozzle surface and base pressure is analysed using pressure probes and Schlieren flow-visualisation techniques. The effects of injection position and truncation on the nozzle surface pressure development are comparable for all geometric variations, resulting in a locally increased static pressure upstream and a locally decreased static pressure downstream of the injection. The magnitude and dimension of these high- and low-pressure regions are correlated with the injection pressure. However, the influence of injection position and truncation on the base pressure is not entirely predictable by the named parameters, indicating an interdependence between both geometric parameters. Finally, the required pressure ratio of injection to the primary flow to ensure sonic injection has been analysed on TUD's cold-gas test bench. This allows the respective injection position-dependent threshold to be identified. The analysis reveals that these experiments have been conducted under transsonic injection conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Structural plasticity of bacterial ESCRT-III protein PspA in higher-order assemblies

Author

Junglas, Benedikt, Hudina, Esther, Schönnenbeck, Philipp, Ritter, Ilona, Heddier, Anja, Santiago-Schübel, Beatrix, Huesgen, Pitter F., Schneider, Dirk, and Sachse, Carsten

Abstract

Eukaryotic members of the endosome sorting complex required for transport-III (ESCRT-III) family have been shown to form diverse higher-order assemblies. The bacterial phage shock protein A (PspA) has been identified as a member of the ESCRT-III superfamily, and PspA homo-oligomerizes to form rod-shaped assemblies. As observed for eukaryotic ESCRT-III, PspA forms tubular assemblies of varying diameters. Using electron cryo-electron microscopy, we determined 61 SynechocystisPspA structures and observed in molecular detail how the structural plasticity of PspA rods is mediated by conformational changes at three hinge regions in the monomer and by the fixed and changing molecular contacts between protomers. Moreover, we reduced and increased the structural plasticity of PspA rods by removing the loop connecting helices α3/α4 and the addition of nucleotides, respectively. Based on our analysis of PspA-mediated membrane remodeling, we suggest that the observed mode of structural plasticity is a prerequisite for the biological function of ESCRT-III members.

Published
2024
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