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What links Airbus' ZEROe project with Germany's salt caverns? Hydrogen. A promising carbon-free fuel, it's an attractive energy vector for Hamburg's future energy needs. Industry and the City of Hamburg are investing heavily in hydrogen infrastructure and research. Moving from fossil aviation fuels to hydrogen is going to be a complex, costly business. According to a recent study by Transport and Environment, the price tag of transitioning aviation to hydrogen in the EU could be up to €300bn. Too expensive? As one of the contributors to the study, Lukas Sens of the Technical University of Hamburg, notes, compare that to the €161bn net income of Saudi Aramco in 2022. And the same study estimates that up to 65% of intra-EU aviation could be fuelled by hydrogen by 2050. And that the cost per passenger flying on a hydrogen-fuelled plane might be only 7% more than using fossil kerosene. On this episode of Hamburg Aviation Green, Lucas gives us a deep dive on the techno-economic issues surrounding hydrogen adoption in aviation. We talk about carbon pricing and trading, ticket prices on LH2-fuelled planes, sector coupling and energy sovereignty, to name just a few. But what about the salt caverns? They could reduce the cost of green hydrogen by up to 50%. How? Listen in and find out. This episode is the last in this season of Hamburg Aviation Green. Make sure to check out some of our recent episodes, including hydrogen at Hamburg Airport, accelerating innovation at ZAL, sustainable cabins, life cycle assessments and much more.

Asia has experienced a significant increase in population and consumption, leading to a rise of waste generation. However, the ability of socio-economic systems in the region to effectively manage and dispose of this waste remains insufficient. The Erasmus+ Project “SWAP” (Sustainable solid WAste management and Policies) aims to build capacitiy in higher education and technical and vocational training in the field of solid waste management in Vietnam, Thailand, and Cambodia. This workshop abstract provides an in-depth exploration of the current state of education on solid waste management in these countries, the challenges they face, the structure, the objectives, and the main results of the SWAP-project.

Study of wear in complex micro-machines is often accomplished with experimental methods, like pin on disc, scratch test, atomic force microscopy or surface force apparatus. These experiments are often conducted within the parameter space of the micro-machine and at constant load and sliding velocity. In reality, the contact loadings are time dependent and, in particular in the case of micro-machines, fast moving and rapidly changing. Using twin-wheel experiments, the wear law for the contacting materials is determined in form of the wear coefficient included in Archard's wear model. For the prediction of wear in more complex systems, a numerical simulation tool has been developed, which incorporates the identified wear model. This so-called Wear-Processor is capable of a fully transient wear integration scheme and is used to simulate wear in a micro gear, which is currently being developed within the collaborative research centre SFB 499. First results give an impression how fast the gear tooth geometry and the slip rates deviate from their original shape as a consequence of ongoing wear. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

We present a new path-consistent well-balanced finite volume method within the framework of the evolution Galerkin (FVEG) schemes. The methodology will be illustrated for two layer shallow water equations with source terms modelling the bottom topography and Coriolis forces. The FVEG methods couple a finite volume formulation with approximate evolution operators. The latter are constructed using the bicharacteristics of multidimensional hyperbolic systems, such that all of the infinitely many directions of wave propagation are taken into account explicitly. We will derive a suitable path in the phase space that is based on the evolution operator and derive the corresponding path-consistent FVEG scheme. The path-consistent FVEG scheme is well-balanced for the stationary steady states as well as for the steady jets in the rotational frame. © 2011 Springer-Verlag Berlin Heidelberg.