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Física, química, pesquisa, instrumentos e experimentos
Atualizado
Researchers correlated X-ray maps of titanium oxidation state with local electrochemical probing of single Ti3C2Tx flakes; redox activity extended well beyond the point of contact.
Radiocarbon dating at 1 cm resolution revealed event layers in a 40 cm core that X-ray and CT missed; some match recorded earthquakes of the 13th–20th centuries.
A theoretical study from Japan's Institute for Molecular Science reproduces most of a puzzling infrared signal in a perovskite film without any change in molecular vibrations.
Researchers at UVSOR used phase-coherent extreme ultraviolet pulse pairs and watched interference fringe contrast fall over a few femtoseconds, tracking an inner-shell vacancy in xenon atoms.
A prototype at TU Wien locks a laser to thorium nuclei without a conventional atomic clock. Its precision is about 10^-15, still below the best optical atomic clocks.
Argonne researchers benchmarked three single-crystal iridium faces in acid and alkali. Activity depends on the face and on pH, and alkaline media produce much more hydrogen peroxide.
A theoretical model from JINR with two collective parameters reproduced measured half-lives of isotopes from uranium to hassium, which differ by tens of orders of magnitude.
A refined QSAR approach combines the ddE index, molecular weight and ortho substitution. On 1,177 amines it reached a positive predictive value of 65.6%, reducing false positive Ames predictions.
A Delft University of Technology team flipped the nuclear spin of a single atom even when it was largely disentangled from the electron spin, contrary to the authors' expectations.
Astronomers using the Gemini North telescope on Maunakea report a faint, tight pair of quasars, seen as it was during the epoch of reionization.
The model uses Inouye telescope images and scaling laws from near-Earth spacecraft data to estimate how the corona is heated to more than a million degrees.
Researchers ruled out binary black holes of about 10 billion solar masses and above in two distant systems. These are the first gravitational-wave limits for so early an epoch.
In a retrospective Mayo Clinic study of 137 leads, awake surgery led to repositioning in about 15%; 88% of those changes could not have been made by imaging alone.
Researchers calibrated a low-cost digital camera to read the infrared electroluminescence of silicon modules and derive open-circuit voltage; tested on eight modules built 1978–2022.
A team from Charles University and the University of Cambridge showed that current pulses switch UTe₂ between low and high critical current density states, and the state persists for hours.
Excavations at Old Dongola in northern Sudan exposed a large staircase and, on an upper level, an unexpected smaller church with Greek-inscribed plaster fragments.
Analysis of the GW190412 signal constrains the recoil direction of the merged black hole and disfavours kick speeds below 50 km/s, typical for dense globular clusters.
Astronomers from Nagoya and Gifu universities mapped a 26-light-year trail of warmed CO gas at LMC P3, supporting the microquasar model of its gamma-ray emission.
Microscopy and simulations show the blue peak of the non-spectral magenta in Anna's hummingbird feathers arises from interaction of the top and middle melanosome layers.
The project will test the full chain on CO₂ from a real flue gas stream at EEW's Eschbach site; earlier, the steps were shown in a 2020 experimental unit.
