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A new theoretical concept of the quantum mechanical processes in spin filter for the separation ofmetastable hydrogen atoms in individual hyperfine substates enables a number of new applications.For example, it is now possible to build a new generation of Lamb-shift polarimeter that canseparate not only 𝛼 but also the 𝛽 substates with $𝑚_𝐽 = −1/2$. This opens up completely newpossibilities for the search of hydrogen atoms in forbidden substates after the bound beta decayof the neutron. [...]

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Climate change is altering hydrological processes and water availability, requiring robust long-term analyses based on consistent data and models. In the article, the main components of the hydrological water balance––precipitation, evapotranspiration, and runoff––in Slovenia for the period 1972–2024 are analysed. [...]