Researchers at RIKEN have demonstrated submicrometer focusing of isolated attosecond pulses in the extreme-ultraviolet (XUV) region. Using a custom-designed ellipsoidal mirror, they focused a 1.1-gigawatt tabletop isolated-attosecond-pulse source to a spot as small as 0.46 × 0.36 micrometers, corresponding to a peak intensity of 3.0 × 10¹⁵ W/cm².

Antarctic ozone recovery alters austral summer Southern Hemisphere circulation patterns

Researchers at Stevens Institute of Technology and their collaborators discover a surprising way to improve anion exchange membranes, a key component of lower-cost hydrogen fuel cells. They find that some rigid polymers form highly organized, water-filled channels when immersed in water, allowing ions to move more efficiently—challenging assumptions about how these materials should be designed, and paving the way to more affordable and sustainable hydrogen technologies.

This study designs a phosphorus-doped vacancy regulation and phase interface engineering strategy to fabricate a MOF-derived metal selenide@carbon dual-matrix material, denoted as P-NiSe₂/CoSe₂@NC (PNCS). By optimizing the phosphorus source doping ratio and calcination temperature, the optimal electromagnetic wave absorption mechanism is explored. The results demonstrate that through iterative optimization of doping concentration and thermal conditions, the material achieves a synergistic balance between defects and heterogeneous interfaces, leading to superior electromagnetic wave absorption performance. At a matching thickness of only 2.1 mm, an effective absorption bandwidth of 7.04 GHz is attained, and the entire X-band and Ku-band can be covered within a controllable thickness of 2.6 mm, showing significantly enhanced performance compared to analogous samples. The “dual-core driven” strategy, combining oxygen vacancies and selenide heterointerfaces, optimizes dielectric relaxation and polarization loss, offering new insights for the development and application of next generation high-efficiency electromagnetic wave absorbing materials.

Tidal currents flood and ebb with the tide, but their motion does not average to zero everywhere over a tidal cycle. 

We present a photonic integrated circuit composed of two coupled photonic quantum memristors with crossed feedback. The input is generated by a room-temperature single-photon source based on a silicon-vacancy color center in a nanodiamond. The input–output relations exhibit higher nonlinearity and memory effects compared with a single photonic quantum memristor: these new features make our network especially suited for reservoir computing. Finally, we experimentally use our system in temporal series predictions.

A recent review outlines major advances in hydrogel-based strategies for musculoskeletal therapy. Through refined material design and strengthened mechanical performance, hydrogels can mimic key extracellular matrix features while enabling localized and controlled delivery of drugs, cells, and other bioactive cues. They can also be engineered into clinically relevant formats, including injectable systems, scaffolds, patches, and adhesive sealants, supporting applications across bone and cartilage repair, osteoarthritis management, disc regeneration, tendon healing, and dural repair.