200,439 research outputs found
Testamentum novum <franz.>
No full textAutopsie nach Exemplar der ULB Sachsen-AnhaltVorlageform des Erscheinungsvermerks: A Altona Et Flensbourg, Chez Les Freres Korte. - M DCC XXXIX.Frontispiz (Kupferst.
Antwort-Schreiben an Jhro HochEhrwürden Herrn D. Carpzoven, Superintendenten und Haupt-Pastoren zu Lübeck, über eine von Demselben wider die Mährische Brüder gehaltenen und nachher gedruckte Predigt und deren Anhang / herausgegeben von Jhrem Prediger M. Johann Georg Waiblingern
No full textAutopsie nach Ex. der ULB Sachsen-AnhaltVorlageform des Erscheinungsvermerks: Altona, im Verlag der Gebrüder Korte. 1740
Spectroscopic investigations of the H3PO4 and H2O uptake of polybenzimidazole membranes for fuel cells
No full textPolybenzimidazole (PBI) doped with H3PO4 is the most commonly used membrane material for high-temperature polymer fuel cells. Proton conductivity is strongly dependent on acid doping and water content (humidity). Despite these facts, only little is known on the chemical equilibria of all species inside the membrane as a function of the composition of the ternary system PBI - H3PO4 - H2O. This includes details on the proton transfer processes, on the dominant conduction mechanisms and on the condensation equilibria, leading to the formation of diphosphoric acid and higher homologues species.
In this study, Raman and NMR spectroscopy is used to investigate the chemical inter¬actions between H3PO4, H2O and PBI vs. the H3PO4 doping level. We obtained information on the H-bond formation between H3PO4 and the polymer chains, on tautomeric processes as well as on the presence of not directly bound H3PO4 at high doping levels. Investigations were performed with uncrosslinked and crosslinked m-PBI and AB-PBI [1-4]. [1] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D Stolten, Phys. Chem. Chem. Phys. 14, 10022-10026 (2012) [2] F. Conti, S. Willbold, S. Mammi, C. Korte, W. Lehnert, D. Stolten, New J. Chem. 37, 152-156 (2013). [3] A. Majerus, F. Conti, C. Korte, W. Lehnert, D. Stolten, ECS Transaction, in press. [4] G. A. Giffin, F. Conti, S. Lavina, A. Majerus, G. Pace, C. Korte, W. Lehnert, V. Di Noto, Int. J. Hydrogen Energy, submitted
Spectroscopic Investigation of the Acid and Water Uptake of Polybenzimidazole Membranes for Fuel Cells
No full textPolybenzimidazole (PBI) doped with H3PO4 is the most commonly used membrane material for high-temperature polymer fuel cells. Proton conductivity is strongly dependent on acid doping and water content. Despite these facts, only little is known on the chemical equilibria of all species inside the membrane as a function of the composition of the ternary system PBI - H3PO4 - H2O. This includes details on the proton transfer processes, on the dominant conduction mechanisms and on the condensation equilibria, leading to the formation of diphosphoric acid and higher homologues species.
In this study, Raman and NMR spectroscopy is used to investigate the chemical interactions between H3PO4, H2O and PBI vs. the H3PO4 doping level. We have obtained information on the H-bond formation between H3PO4 and the polymer chains, on tautomeric processes as well as on the presence of not directly bound H3PO4 at high doping levels. Investigations were performed with uncrosslinked and crosslinked m-PBI and AB-PBI [1-4]. [1] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D Stolten, Raman study of the polybenzimidazole–phosphoric acid interactions in membranes for fuel cells, Phys. Chem. Chem. Phys. 14 (2012) 10022. [2] F. Conti, S. Willbold, S. Mammi, C. Korte, W. Lehnert, D. Stolten, Carbon NMR investigation of the polybenzimidazole–dimethylacetamide interactions in membranes for fuel cells, New J. Chem. 37 (2013) 152. [3] A. Majerus, F. Conti, C. Korte, W. Lehnert, D. Stolten, Thermogravimetric and Spectroscopic Investigation of the Interaction between Polybenzimidazole and Phosphoric Acid, ECS Transaction (2013) accepted. [4] G. A. Giffin, F. Conti, S. Lavina, A. Majerus, G. Pace, C. Korte, W. Lehnert, V. Di Noto, A vibrational spectroscopic and modeling study of poly(2,5-benzimidazole) - phosphoric acid interactions, Int. J. Hydrogen Energy (2013) accepted
Blood velocity vector imaging in the carotid artery using ultrasound
No full textContains fulltext :
205619.pdf (Publisher’s version ) (Open Access)Radboud University, 20 augustus 2019Promotor : Korte, C.L. de Co-promotores : Nillesen, Maartje M., Hansen, H.H.G
Ex-situ NMR and Raman studies of H3PO4 and H2O uptake of polybenzimidazole membrane for PEMFC
No full text: Polybenzimidazole (PBI) doped with H3PO4 is the most commonly used membrane mate-rial for high-temperature polymer fuel cells. Despite this fact, only less is known on the chemical equilibria of all species inside the membrane as a function of the com¬position of the ternary system PBI - H3PO4 - H2O. This in¬clu¬des details on the proton transfer pro¬ces-ses, on the dominant conduc¬tion me¬cha¬nisms and on the con¬densation equilibria, lea-ding to the formation of di¬phos¬pho¬ric acid and higher homo¬logues species.
In this study Raman and NMR spectroscopy is used to in¬vestigate the chemical inter¬ac-tions between H3PO4, H2O and PBI vs. the H3PO4 doping level. We could ob¬tain in¬forma-tion on the H-bond formation between H3PO4 and the polymer chains, on tauto¬me¬ric pro-ces¬ses as well as on the presence of not directly bounded H3PO4 at high do¬ping levels [1,2]. Investigations were performed with uncrosslinked and cross¬linked m-PBI and AB-PBI. [1] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, and D. Stolten, Phys. Chem. Chem. Phys. 14, 10022-10026 (2012) [2] F. Conti, S. Willbold, S. Mammi, C. Korte, W. Lehnert, and D. Stolten, New J. Chem. 37, 152-156 (2013)
Noninvasive vascular ultrasound elastography
No full textContains fulltext :
100604.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 16 november 2012Promotor : Prokop, M. Co-promotor : Korte, C.L. d
Preface - Joint special issue on nanomechanical testing in materials research and development VIII
No full textArcheologisch inventariserend veldonderzoek aan de Korte Holk 1 te Nijkerk, gemeente Nijkerk (GE)
No full textIn april 2012 heeft MUG Ingenieursbureau een inventariserend booronderzoek uitgevoerd op een perceel aan Korte Holk 1 te Nijkerk in gemeente Nijkerk. Hierbij zijn in totaal zes boringen gezet. Op basis van de resultaten van het booronderzoek kan worden geconcludeerd dat in de onderzoekslocatie enerzijds sprake is van een verstoord bodemprofiel (boring 1 t/m 3) en anderzijds van een natuurlijk bodemprofiel zonder archeologische indicatoren (boring 4 t/m 6)
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