1,296 research outputs found
Buchbesprechung - Marie-Luise Zimmer, Brigitte Loos-Frank, Volker Bernius (Hg.): Musiktherapie mit Leib und Seele. Gertrud Katja Loos. Leben – Werk – Erinnerungen
No full textEnthält eine Buchbesprechung zu: Marie-Luise Zimmer, Brigitte Loos-Frank, Volker Bernius (Hg.): Musiktherapie mit Leib und Seele. Gertrud Katja Loos. Leben – Werk – Erinnerungen. Reichert Verlag, zeitpunkt musik, Wiesbaden 2006. 340 Seiten, € 39.90, ISBN: 3-89500-466-9peerReviewedpublishedVersio
Block copolymer template-directed synthesis of well-ordered metallic nanostructures
Get PDFNanoporeuze metallische schuimen fabriceren met blokcopolymeren Het proefschrift van Ivana Vukovic gaat over metallische nanoschuimen, een nieuwe klasse van 3D-nanomaterialen waarin eigenschappen van metalen en nanoporeuze materialen worden gecombineerd. De unieke combinatie zorgt ervoor dat nanoporeuze metallische schuimen kunnen worden gebruikt voor waterstofopslag, actuatoren, nieuwe 3D-gestructureerde batterijen, vervangers voor platinum-katalysatoren, etc. Veelgebruikte technieken, zoals het scheiden van legeringen, sol-gel synthese, nanosmelten, verbrandingssynthese, etc., leveren over het algemeen materialen op met een ongeordende architectuur, iets wat een nadelig effect kan hebben op de mechanisch eigenschappen. Blokcopolymeren daarentegen kunnen spontaan overgaan in bi-continue geordende nanostructuren. Vervolgens kunnen ze worden toegepast als een soort mal (op nanoschaal) voor de het maken van goedgeordende metallische nanoschuimen. Het idee om deze blokcopolymeren te gebruiken voor de fabricatie van deze nanoschuimen wordt verder uitgewerkt en beschreven in dit proefschrift, met de daarbij behorende experimentele resultaten en toekomstperspectieven. Daarnaast wordt het fasegedrag onderzocht van supramoleculaire complexen die op blokcopolymeren zijn gebaseerd en die worden gebruikt als voorlopers voor goedgeordende metallische nanoschuimen.
Biobased Networks from Lignin/Cellulose via Diels-Alder Click Chemistry
Get PDFThermosets play a key role in modern plastic and coating industries. However, the cross-links responsible for their outstanding properties, such as improved tensile strength and chemical and thermal resistance, render them unable to undergo reprocessing or recycling. Herein, biobased thermosets were prepared from lignin and cellulose via the Diels-Alder (DA) click reaction, thereby providing fully biobased polymer thermosets while envisioning the properties of dynamic networks. Furan and maleimide moieties were attached to soda lignin and cellulose. DA reactions were then carried out using different combinations of functionalized lignins and bismaleimide, forming a cross-linked network while simultaneously enabling a reversible control over thermally induced de-cross-linking and re-cross-linking. In contrast, thermoreversibility was not achieved when associating both lignin and cellulose via DA-based cross-links, even though mild reaction temperatures and lower degrees of cross-linking were considered. Ultimately, the study contributed to widening the use of furan-maleimide DA click chemistry for the preparation of sustainable materials, providing insights into a green and versatile platform that may be considered for future applications.</p
Measuring Vulnerability to Poverty Using Long-Term Panel Data
No full textMeasuring Vulnerability to Poverty Using Long-Term Panel Data Author & abstract Download & other version 16 References 4 Citations Related works & more Corrections Author Listed: Katja Landau (Georg-August-University Göttingen) Stephan Klasen (Georg-August-University Göttingen) Walter Zucchini (Georg-August-University Göttingen) Registered: Stephan Klasen Abstract We investigate the accuracy of ex ante assessments of vulnerability to income poverty using cross-sectional data and panel data. We use long-term panel data from Germany and apply di fferent regression models, based on household covariates and previous-year equivalence income, to classify a household as vulnerable or not. Predictive performance is assessed using the Receiver Operating Characteristics (ROC), which takes account of false positive as well as true positive rates. Estimates based on cross-sectional data are much less accurate than those based on panel data, but for Germany, the accuracy of vulnerability predictions is limited even when panel data are used. In part this low accuracy is due to low poverty incidence and high mobility in and out of poverty
Resilience as a positive lever: An analysis of sensemaking and meaningful work in the context of organizational change
No full textAuthor Katja SchwarzMasterarbeit Johannes Kepler Universität Linz 2024Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
Measuring Vulnerability to Poverty Using Long-Term Panel Data
No full textMeasuring Vulnerability to Poverty Using Long-Term Panel Data Author & abstract Download & other version 16 References 4 Citations Related works & more Corrections Author Listed: Katja Landau (Georg-August-University Göttingen) Stephan Klasen (Georg-August-University Göttingen) Walter Zucchini (Georg-August-University Göttingen) Registered: Stephan Klasen Abstract We investigate the accuracy of ex ante assessments of vulnerability to income poverty using cross-sectional data and panel data. We use long-term panel data from Germany and apply di fferent regression models, based on household covariates and previous-year equivalence income, to classify a household as vulnerable or not. Predictive performance is assessed using the Receiver Operating Characteristics (ROC), which takes account of false positive as well as true positive rates. Estimates based on cross-sectional data are much less accurate than those based on panel data, but for Germany, the accuracy of vulnerability predictions is limited even when panel data are used. In part this low accuracy is due to low poverty incidence and high mobility in and out of poverty
Resilience as a positive lever: An analysis of sensemaking and meaningful work in the context of organizational change
No full textAuthor Katja SchwarzMasterarbeit Johannes Kepler Universität Linz 2024Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
Enzymatic Synthesis of Amylose Brushes Revisited: Details from X-Ray Photoelectron Spectroscopy and Spectroscopic Ellipsometry
Get PDFThe successful synthesis of amylose brushes via enzymatic ‘‘grafting from’’ polymerization and the detailed characterization of all synthetic steps by X-ray photoelectron spectroscopy (XPS) and spectroscopic ellipsometry measurements are reported. Au and Si surfaces are amino-functionalized with self-assembled monolayers (SAMs) of cystamine and 3-aminopropyldimethyethoxysilane (APDMES), respectively. Maltoheptaose is covalently attached to the amino-functionalized Au and Si surfaces via reductive amination. Amylose brushes are grown from maltoheptaose modified Au and Si surfaces with enzymatic polymerization using potato phosphorylase and Rabbit Muscle phosphorylase, as evidenced by spectroscopic ellipsometry and XPS measurements.
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