Ventilation systems belong to the common equipment for longer road tunnels that have to be designed for both normal and emergency operation. The scientific consensus and the state of the art in this regard are largely based on investigations in model scale, in which partial similarity is assumed. Especially for emergency operation, the robustness o...
Published in HTM Journal of Heat Treatment and Materials
Gas impingement jets are widely applied in industrial cooling processes. In continuous heat treatment lines of steel, aluminium and copper strips, impingement jet nozzle systems are utilised to achieve rapid cooling or heating. The heat transfer depends on the flow but also on the geometric parameters such as nozzle to strip distance and the nozzle...
To meet the increasing demand for powerful data storage, new technologies such as resistive switching are becoming increasingly important. Here, the resistance of a material can be changed, for example, by applying a voltage. However, due to the numerous different mechanisms and switching behaviour, the understanding of this phenomenon is still lim...
Published in HTM Journal of Heat Treatment and Materials
Induction hardening of large bearing rings is a very challenging procedure due to the complex physical processes and their interactions, which need to be properly controlled to produce components meeting the imposed requirements of e.g. wind turbines. The different process parameters significantly alter the resulting microstructures and properties ...
The human voice plays a major role in interpersonal communication. A key property of the voice is its directionality, as it influences the energy distribution in the surrounding space and at the ear of the receiver. Research on this topic is of great relevance for architectural design, the development of new technologies in the field of telecommuni...
This thesis presents the results of the simulation of two different parts from the typical atmospheric interface found in a mass spectrometer: the transfer capillary and the ion funnel. These are usually found in combination with electrospray ionization and allow the transition between atmospheric pressure and vacuum. The main goal of the study is ...
Published in HTM Journal of Heat Treatment and Materials
Austempered ductile iron (ADI) materials show a good combination of mechanical properties, with high tensile strength levels (800-1600 MPa) and an elongation at fracture of up to 10 %. Due to its high fracture toughness as well as high fatigue resistance, ADI is a very attractive material group for applications under cyclic loads. However, the mate...
The structure of biological adhesion systems, which mainly contribute to insects’ strong adhesion ability, have attracted great interest of researchers in the last few decades. A lot of theoretical analysis has been carried out to understand the mechanism of bio-adhesion, for example, the concept of contact splitting and the principle of equal load...
