Arie de Keizer

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Small grid-connected photovoltaic systems up to 5 kWp are often not monitored because advanced surveillance systems are not economical. Hence, some system failures which lead to partial energy losses stay unnoticed for a long time. Even a failure that results in a larger energy deficit can be difficult to detect by PV laymen due to the fluctuating energy(More)
S. Stettler, P. Toggweiler, E. Wiemken, W. Heidenreich, A.C. de Keizer, W.G.J.H.M. van Sark, S. Feige, M. Schneider, G. Heilscher, E. Lorenz, A. Drews, D. Heinemann 1Enecolo AG, Lindhofstr. 52, 8617 Mönchaltorf, Switzerland, T: +41 1 994 9001, F: +41 1 994 9005, E: Fraunhofer ISE, Heidenhofstr. 2, 79110 Freiburg, Germany, T.: +49 761 4588(More)
Using light scattering and cryogenic transmission electron microscopy, we show that highly aggregated polyelectrolyte complexes (HAPECs) composed of poly([4-(2-aminoethylthio)butylene] hydrochloride)49-block-poly(ethylene oxide)212 and poly(acrylic acid) (PAA) of varying lengths (140, 160, and 2000 monomeric units) are metastable or unstable if the method(More)
In aqueous solutions at room temperature, poly( N-methyl-2-vinyl pyridinium iodide)- block-poly(ethylene oxide), P2MVP 38- b-PEO 211 and poly(acrylic acid)- block-poly(isopropyl acrylamide), PAA 55- b-PNIPAAm 88 spontaneously coassemble into micelles, consisting of a mixed P2MVP/PAA polyelectrolyte core and a PEO/PNIPAAm corona. These so-called complex(More)
In this paper, we report on the fluorescence enhancement of Eu coordination complexes in dilute solutions through electrostatic complex micelle formation with an oppositely charged block polyelectrolyte. The coordination complexes alone are oligomeric structures which have many ends where partially coordinated europium is exposed to water. In the presence(More)
Tamarind seed xyloglucan was partially degraded with a purified endoglucanase (endoV) from Tricboderma viride. Analysis by highperformance anion-exchange chromatography showed that this digest was composed of fragments consisting of 1 to 10 repeating oligosaccharide units ([xgl,-[xg],,,). To study the adsorption of xyloglucan fragments to cellulose in(More)
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