The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
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Wide-field quantum sensing shows μm-scale inhomogeneous superconductivity in high-pressure La3Ni2O7, linking local diamagnetic response to stress and stoichiometry and clarifying mechanisms that suppress or enhance superconductivity.