On September 9, 2025, Jelena Jurjeva, an external doctoral student at the Department of Energy Technology, successfully defended her doctoral thesis titled "Analytical Quality by Design in Environmental Analysis" (Estonian title: "Analüütilise disainiruumi kontseptsiooni rakendamine saasteainete pinnases määramise meetodi väljatöötamisel"). The thesis was supervised by Senior Researcher Mihkel Koel, with opponents Professor Miguel de la Guardia from the University of Valencia, Spain, and Researcher Riin Rebane from the University of Tartu.
In addition to serving as an opponent for the doctoral thesis, Professor Miguel de la Guardia delivered an open lecture at the Department of Energy Technology on September 10, titled "Active and Passive Sampling in Environmental Analysis."