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Oil Film Dynamics in Aero Engine Bearing Chambers
Aero engine bearing chambers are complex machine elements inside the engines, supporting up to three concentric shafts on bearings. For safety reasons, the aero engines always employ rolling-element type bearings and therefore require a sufficient oil supply for lubrication in order to guarantee a reliable operation. As a consequence, a complex two-phase flow consisting of oil and sealing air governs the bearing chambers. A highly dynamic oil film, flowing along the chamber walls, plays a vital role to fulfill the tasks of cooling, lubricating and cleaning the bearing chambers. The design and optimization process of the bearing chambers requires a detailed understanding in order to accuratel...
Feeding Ecology of and Lead Exposure in a Top Predator
Although the feeding ecology of raptors has attracted the attention of many scientists, aspects such as diet selection and foraging strategy are still poorly understood. This is particularly true for large species such as the white-tailed eagle. Representative assessments of the contribution of food sources containing toxins such as lead to raptor diets are scarce but are essential for optimising conservation efforts. This dissertation investigated the feeding ecology of white-tailed eagles to shed light on the interaction of such top predators with their environment and to improve the conservation management of this lead-exposed species. A use of complementary methods identified the most ef...
Christian Engagement with Islam
Why did the Christian Church, in the twentieth century, engage in dialogue with Islam? What has been the ecumenical experience? What is happening now? Such questions underlie Douglas Pratt’s Christian Engagement with Islam: Ecumenical Journeys since 1910. Pratt charts recent Christian (WCC and Vatican) engagement with Islam up to the early 21st century and examines the ecumenical initiatives of Africa’s PROCMURA, ‘Building Bridges’, and the German ‘Christian-Muslim Theological Forum’, together with responses to the 2007 ‘Common Word’ letter. Between them, Islam and Christianity represent over half the earth’s population. Their history of interaction, positive and negative, impacts widely still today. Contentious issues remain real enough, yet the story and ongoing reality of contemporary Christian-Muslim engagement is both exciting and encouraging.
