49 research outputs found
De weg naar de Rijn:een nieuwe publieke verbinding tussen de Heumarkt en de Rijn in het centrum van Keulen
Very long optical path-length from a compact multi-pass cell
The multiple-pass optical cell is an important tool for laser absorption
spectroscopy and its many applications. For most practical applications, such
as trace-gas detection, a compact and robust design is essential. Here we
report an investigation into a multi-pass cell design based on a pair of
cylindrical mirrors, with a particular focus on achieving very long optical
paths. We demonstrate a path-length of 50.31 m in a cell with 40 mm diameter
mirrors spaced 88.9 mm apart - a 3-fold increase over the previously reported
longest path-length obtained with this type of cell configuration. We
characterize the mechanical stability of the cell and describe the practical
conditions necessary to achieve very long path-lengths
De weg naar de Rijn:een nieuwe publieke verbinding tussen de Heumarkt en de Rijn in het centrum van Keulen
On predicting the results of applying workflow management in a healthcare context
Even though workflow management systems are currently not being applied on a wide scale in healthcare settings, their benefits with respect to operational efficiency and reducing patient risk seem enticing. The authors show how an approach that is rooted in simulation can be useful to predict the benefits of using a workflow management system. The approach is discussed and its application is demonstrated in the setting of the pre-operative process as being executed in the Bronovo hospital. The approach is considered useful for other healthcare organizations in search for a better foundation for the application of workflow technology
On the influence of electron-beam parameters on TWT small-signal gain
The electron beam is one of the main components in traveling-wave tubes (TWTs). A study on the influence of the parameters related to the electron beam on small-signal gain of TWTs is proposed. In particular, the effect of the variations of electron-beam voltage, the perveance of the electron gun, and electron beam radius are investigated. A five-section TWT was considered in the study. (C) 2002 Wiley Periodicals, Inc