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Ethnographie - Pädagogik - Geschlecht
Der Sammelband stellt Berichte aus der pädagogischen Geschlechterforschung vor, die zum einen grundlegende Perspektiven zur ethnographischen Methodologie formulieren und zum anderen konkrete Forschungsergebnisse aus ethnographischen Projekten im Kontext von Kindheit und Jugend präsentieren. Dabei geht es unter anderem um ein theoretisches Verständnis von Differenzen und Unterscheidungspraktiken oder auch um die Berücksichtigung der normativen Verstricktheit der Forschenden in Beobachtungssituationen. Es werden methodologische Herausforderungen aufgegriffen, die für differenz- und ungleichheitssensibel angelegte Untersuchungen typisch sind und damit einen Beitrag zur Weiterentwicklung einer Ethnographie pädagogischer Geschlechterforschung leisten möchten.
Metalorganic Catalysts for Synthesis and Polymerization
45 years after the discovery of transition metals and organometallics as cocatalysts for the polymerization of olefins and for organic synthesis, these compounds have not lost their fascination. The birthday of Karl Ziegler, the great pioneer in this metalorganic catalysis, is now 100 years ago. Polyolefins and polydienes produced by Ziegler-Natta catalysis are the most important plastics and elastomers. New impulses for the polymerization of olefins have been brought about by highly active metallocenes and other single site catalysts. Just by changing the ligands of the organometallic compounds, the structure of the polymers produced can be tailored in a wide manner. In invited lectures and posters, relevant aspects of the metalorganic catalysts for synthesis and polymerization are discussed in this book. This includes mechanism and kinetics, stereochemistry, material properties, and industrial applications.
Evaluating Bilingual Education in Germany
A quasi-experimental study on 1,000 learners shows large initial differences between future CLIL and non-CLIL students due to selection and preparation effects. After two years, a model-based evaluation finds a small increase in EFL academic self-concept, but no CLIL-related benefits for general English proficiency or interest in EFL classes.
Ziegler Catalysts
Forty years after Ziegler's discovery of the "Aufbaureaktion" and low-pressure ethene polymerization, transition metal catalyzed olefin and diolefin polymerization continues to represent one of the most active and exciting areas. Since the 1980s, outstanding scientific innovations and process improvements have revolutionized polyolefin technology and greatly simplified polymerization processes. Well-defined catalyst systems are now at hand and facilitate the understanding of basic reaction mechanisms and correlations between catalyst structures, polymer microstructures, and polymer properties. This book reviews some of the modern approaches in organometallic chemistry, Ziegler-Natta catalysis, polymerization processes, design of novel materials, and the modelling in catalyst and process development.
Transition Metals and Organometallics as Catalysts for Olefin Polymerization
More than 30 years after the discovery of transition metals and organometal lics as catalysts for olefin polymerization these catalysts did not have lost their fascination. Since 1953 when Karl Ziegler has discovered the catalytic polymerization of ethylene leading to plastically formable polymers which are mechanically stable up to temperatures of about 100°C, synthetic polymers and rubbers have made their way right into private houses. This discovery has been a main impetus for the fast growing production of plastics. The stereoselective poly merization of propylene and other long-chain a-olefins first detected by Giulio Natta leads to an even broadened field of applications. Another enfo...
Olefin Polymerization
With an enormous velocity, olefin polymerization has expanded to one of the most significant fields in polymers since the first industrial use about 50 years ago. In 2005, 100 million tons of polyolefins were produced - the biggest part was catalyzed by metallorganic compounds. The Hamburg Macromolecular Symposium 2005 with the title "Olefin Polymerization" involved topics such as new catalysts and cocatalysts, kinetics, mechanism and polymer reaction engineering, synthesis of special polymers, and characterization of polyolefins. The conference combined scientists from different disciplines to discuss latest research results of polymers and to offer each other the possibility of cooperation. This is reflected in this volume, which contains invited lectures and selected posters presented at the symposium.
