Titlebook: Numerical Techniques for Boundary Element Methods; Proceedings of the S Wolfgang Hackbusch Conference proceedings 1992 Springer Fachmedien

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On the Numerical Integration of Singular Surface Integrals in the BEM,the Rabinowitz-Richter estimates for three numerical integration techniques of boundary integral operators on an analytic boundary element containing the source point. We first study weakly singular integral operators which are pseudo-differential operators of order ≤ −1. We show that Duffy’s triang

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ollowing the initial impact and rapid response which required a dramatic pivot for the food sector. Food and water security as a mainstay for sustainable tourism is highlighted, linking this to global frameworks that serve as enablers to achieve this goal. The already well-established causes of food

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M. GuiggianiPrior to the COVID-19 pandemic, a multitude of studies have investigated the benefits of NBT, particularly the outcomes of participating in nature-based leisure and recreation activities for tourist wellbeing. This chapter explores how individuals pursue NBT and leisure during the COVID-19 pandemic

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C. Haack,V. Schlegel,O. Mahrenholtzed, allowing travel to recommence globally. While international travel has been largely suspended in 2020 the industry focus has turned to domestic tourism in most destinations, taking onboard COVID-safe measures to protect travellers. At the same time, the core issues of how to keep tourists safe a

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J. J. Heijstek,H. Schippers, S. 25) in der Ferne bzw. andernorts ist, wenn nicht das, so doch aber zumindest ein zentrales Reisemotiv. Sich . hinzubewegen, heißt . zugehen von dem gegenwärtigen Jetzt, um ein zukünftiges, besseres . (da) zu leben. Sich fortzubewegen und andernorts das absolute Hier zu erleben, scheint der Erlö