Abstract The invisible and congested world of underground utilities (UU) is an indispensable mystery to the general public because their existence until problems happen. Their growth aligns with continuous development cities ever-increasing demand for energy quality life. To satisfy a variety modern requirements like emergency or routine repair, safe dig excavation, monitoring, maintenance, ups...

Effect of fractional gas hold-up εG on volumetric mass transfer coefficient KLa were studied for two different type of airlift contactors conventional and modified. KLa was directly proportional to gas hold-up within bubbly flow regime (UG < 0.075 m/s ) in conventional one but reverse trend ( inversely proportional) was reported in modified airlift contactor. Mathematical relation between KLa a...

Für die Unterstützung bei der Organisation und Durchführung des nunmehr vierten Workshops dieser Serie danken wir dem Programmkomitee, das insbesondere durch die Begutachtung der eingereichten Beiträge und die Unterstützung der Autoren durch Hinweise zu ihren Arbeiten zum Gelingen beigetragen hat: Christoph Beierle, FernUniversität Hagen; Hans-Joachim Goltz, Fraunhofer FIRST, Berlin; Petra Hofs...

Bipartite graphs can model matching problems, hypergraphs and relations between sets. Studying their surface embeddings is an old tradition, illustrated by the utilities problem. I shall show how such embeddings can be described by pairs of permutations, and how this leads to a classification of the regular (most symmetric) embeddings of complete bipartite graphs. This is joint work with Du, Kw...

OBJECTIVE The aim of this study was to calculate preference weights for the Labor and Delivery Index (LADY-X) to make it suitable as a utility measure for perinatal care studies. METHODS In an online discrete choice experiment, 18 pairs of hypothetical scenarios were presented to respondents, from which they had to choose a preferred option. The scenarios describe the birth experience in term...