Quasisymmetry builds a third invariant for charged-particle motion besides energy and magnetic moment. We address quasisymmetry at the level of approximate symmetries first-order guiding-centre motion. find that conditions to leading order are same as exact if one insists symmetry is purely spatial. also generalise allow phase-space symmetries, derive weaker conditions. The latter recover "weak...

Researchers are wondering to what extent it is possible for professions take place in the coming years Metaverse world, which has attracted more attention over time. In this context, aimed discuss whether practice profession of tour guiding Metaverse. The study based on a conceptual research. Since not well-known and easy-to-understand concept, compilation studies that constitute semantic integ...

Metasurfaces can be employed for designing waveguides that confine the electromagnetic energy while they are open structures. In this communication, we introduce a new type of such waveguides, formed by two penetrable metasurfaces having complementary isotropic surface impedances. We theoretically study guided modes supported proposed structure and discuss corresponding dispersion properties. s...

Editor-in-Chief Kim Williams discusses the versatility and range of tools used in exploring questions form-finding, both ancient modern, introduces articles Nexus Network Journal vol. 24 no. 4 (2022). She also makes an important announcement about future NNJ.