Editorial 1 Tribologie + Schmierungstechnik · volume 71 · eOnly special issue 1/ 2024 DOI 10.24053/ TuS-2024-0022 The 24 th International Colloquium Tribology took place from January 23 rd to 25 th 2024 at Technische Akademie Esslingen and as in the past 23 events presented an ideal communication platform for representatives from industry and science. Global challenges regarding energy supply, resource conversation and the urgent need to take completely new pathways in transport and production to combat global warming are eminent in today’s topics. Tribology, as the science of friction, wear and lubrication, is uniquely positioned to address these challenges due to its interdisciplinary nature. The program was built around 5 topics: New trends in lubricants and additives, Coatings, surface interactions and underlying mechanisms, Machine elements and their applications in tribology, Computational methods and digital transformation in tribology, Test and measurement methodologies. The steering committee consisting of Nicole Dörr, Katharina Völkel, Max Marian & Carsten Gachot invited excellent speakers for keynote and plenary topics on mobility, data handling and efficiency enhancement of machine elements. In this e-only issue you will find exemplarily in detail a publication presented at the 24 th International Colloquium Tribology with the title “The Effects of Applying the Tribological Compound TZ NIOD - reversing wear”. TZ NIOD is a complex mixture of silicate material powder with particle sizes ranging from 5 to 50 micrometres. The basis is made up of finely distributed and divided particles of Serpentinite. Wind Tribology was often a topic at the events of International Colloquium Tribology back to the days where micro pitting was a big problem at the start of the millennium. Micro pitting has been long solved, but other topics surfaced during the upscaling from 50 KW turbines to now reaching double digit MW’s. Therefore, you will find three recent articles on wind turbine tribology as the focus theme. Jörg Loos et.al. report on “Friction induced WEC-formation at high loads”. White Etching Cracks occur also in wind turbine rolling element bearings. The article describes a frictional WEC lifetime model, which was derived from a large number of previous bearing tests, providing an explanation for different failure behaviours in the WEC-tests. Ivan Grozev et.al. reports on “Simplified tribological approach for predesign of wind turbine bearing cases, combined with model test investigation”. They learned that 2-Disc tribometer may be used to simulate 100 % sliding, making comparison of different slippage rate easier by only using one tribometer, thus reducing measurement inaccuracies caused by different type of machines (e.g., pin on disc) or operator’s influence Jan Euler et. al. report on “Feasibility study on preloaded flexible conical plain bearings as wind turbine main bearings”. Please enjoy reading this e-only issue and remember Tribology is everywhere. Your editor-in-chief Manfred Jungk 24 th International Colloquium Tribology and Focus Wind Turbine