Recombination-active defects e.g. dislocations in multicrystalline silicon (mc-Si) wafers impact the quality of solar cells. These defects can be quantified during the incoming control of silicon wafers with Photoluminescence (PL) imaging and used to rate the solar cell quality. In this work, we analyze the relevance of defect patterns in PL images...
As the market share of bifacial cells and modules grows, solar cells measurements under bifacial illumination are increasingly becoming a focus of interest. In this work, we present an analysis of four different sorting criteria for bifacial solar cells with the aim of evaluating the impact of these criteria on the power of the modules assembled wi...
Published in BHM Berg- und Hüttenmännische Monatshefte
Zeolites and zeolite rocks are commonly used in different industrial applications. Natural zeolites present an attractive material for environmental applications because of their high abundance, availability and low costs. Depending on geological settings and conditions during mineral formation, natural zeolite deposits usually represent a heteroge...
Different aqueous deicers in the range of 20–50 mass% were investigated by calorimetric methods. A dynamic differential scanning calorimetry (DSC) procedure was developed to determine the thermal properties (freezing point, melting enthalpy) of aqueous brines. Phase change temperatures were characterized for the broad melting peak determining two s...
Published in Erwerbs-Obstbau
Loquat (Eriobotrya japonica L.) grown well for commercial purposes in subtropical regions nearly 30 countries and originated from China. The most important loquat producers in the world are China, Spain, Turkey, Pakistan, India, Italy and Brazil. In this study, ten pre-selected promising loquat genotypes sampled from eastern Black region and analyz...
Published in Tenside Surfactants Detergents
A new type of oligomer betaine surfactants pentasodium N,N′,N″-alkyl diethylene triamine pentaacetic acid containing five carboxylate groups, three quaternary ammonium groups and three hydrophobic groups was synthesized by alkaline neutralization reaction and quaternization with diethylene triamine pentaacetic acid, sodium hydroxide and long chain ...
Gegenstand der hier vorgestellten Arbeit ist die Untersuchung der beim Sintern von nanoskaligen und metallbinderfreien Hartmetallen ablaufenden chemischen Prozesse und die sich dabei ändernde Mikrostruktur sowie die damit verbundenen Eigenschaften. Durch Versuche mit unterschiedlicher Zusammensetzung der Wolframcarbidmischungen konnte die relevante...
