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Der Sauerstoffaustausch zwischen Festkörper und Gasphase ist für eine Reihe technologischer Hochtemperatur-Anwendungen von großer Bedeutung. In der vorliegenden Arbeit wurde die Kinetik dieser Austauschreaktion am Perowskit-Modellsystem Sr(Ti,Fe)O3 elektrochemisch und mikrostrukturell untersucht. Dabei konnte durch Oberflächenbeschichtungen mit Erdalkaliverbindungen (Ca, Sr oder Ba) eine Erhöhung der Sauerstoffaustauschkinetik nachgewiesen werden.

Oberflächenaustauschreaktion --- Sauerstoffaustausch --- Strontiumtitanat --- resistiver Sauerstoffsensor --- Kinetik

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The present work covers fundamental issues such as OME synthesis and properties up to process development and optimization for oxymethylene ethers (OME) production. This innovative diesel fuel can be produced from renewable raw materials. Compared to conventional diesel, OME leads to a significant reduction of nitrogen oxides and soot formation.

Dieselkraftstoff --- Diesel fuel --- Emission reduction --- Oxymethylene ethers (OME) --- Fuel additive --- Kinetics --- Kraftstoffadditiv --- Emissionsreduktion --- Kinetik --- Oxymethylenether (OME)

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Martensite forms under rapid cooling of austenitic grains accompanied by a change of the crystal lattice. Large deformations are induced which lead to plastic dislocations. In this work a transformation model based on the sharp interface theory, set in a finite strain context is developed. Crystal plasticity effects, the kinetic of the singular surface as well as a simple model of the inheritance from austenite dislocations into martensite are accounted for.

Mechanical engineering & materials --- Martensit --- Phasentransformation --- sharp interface --- Kinetik --- martensite --- phase transformation --- kinetic

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Chemical reaction, Conditions and laws of --- Hydrogen bonding --- Membrane separation --- Membranes (Technology) --- Radioactive tracers --- 553.636 --- Isotopic indicators, Radioactive --- Radioactive indicators --- Radioactive labels --- Radioisotope tracers --- Radiolabels --- Radiotracers --- Tracers, Radioactive --- Radioisotopes --- Tracers (Chemistry) --- Artificial membranes --- Separation (Technology) --- Technology --- Filtration, Membrane --- Membrane filtration --- Separation, Membrane --- Hydrogen bonds --- Chemistry, Physical and theoretical --- Molecular association --- Conditions and laws of chemical reaction --- Reaction, Conditions and laws of (Chemistry) --- Physical laws --- Carbonate deposits --- 553.636 Carbonate deposits --- Membranes (Technologie) --- Chemical kinetics --- Chemical kinetics. --- Chemistry, Physical and theoretical. --- Chemistry, Physical. --- Chimie physique et théorique. --- Cinétique chimique --- Heterogenes System. --- Kinetics. --- Kinetik. --- physical chemistry. --- Congrès.