Un détecteur d'ondes radio artisanal utilise des boules de papier aluminium

Un nouveau projet pratique montre comment construire un émetteur et un récepteur radio simples à l'aide d'objets courants comme du papier aluminium.

Le guide explique que les signaux radio restent au cœur de la technologie quotidienne, des autoradios et antennes-relais aux connexions GPS, Wi-Fi et Bluetooth. Il note que ce qu'on appelle l'âge d'or de la radio ne s'est pas vraiment terminé dans les années 1950, car la télévision et les services sans fil modernes reposent toujours sur les mêmes ondes.

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MIT terahertz microscope revealing quantum vibrations in a superconductor crystal, with scientists observing in a lab.
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MIT builds terahertz microscope to observe quantum motions in superconductors

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Physicists at MIT have developed a new microscope using terahertz light to directly observe hidden quantum vibrations inside a superconducting material for the first time. The device compresses terahertz light to overcome its wavelength limitations, revealing frictionless electron flows in BSCCO. This breakthrough could advance understanding of superconductivity and terahertz-based communications.

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A team from Xidian University has developed a car-mounted microwave wireless power system that kept fixed-wing drones airborne for up to 3.1 hours. The system uses GPS positioning, dynamic tracking, and onboard flight controls to maintain alignment between the emitter and drone during flight. The findings were published on March 25 in the peer-reviewed journal Aeronautical Science & Technology.

Physicists at New York University have developed a new type of time crystal using sound waves to suspend tiny styrofoam beads, resulting in nonreciprocal interactions that defy Newton's third law of motion. The compact, visible system oscillates in a steady rhythm and was detailed in Physical Review Letters. Researchers suggest potential applications in quantum computing and insights into biological rhythms.

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Scientists have developed a light-based sensor that can identify tiny amounts of cancer biomarkers in blood samples, potentially enabling earlier detection than traditional scans. The technology combines DNA nanostructures, CRISPR, and quantum dots to produce a clear signal from just a few molecules. Tests on lung cancer patient serum showed promising results at sub-attomolar levels.

Physicists at MIT have developed a theoretical technique inspired by the film Interstellar to send messages backwards in time using quantum entanglement. The approach mimics closed time-like curves and surprisingly improves communication through noisy channels. While actual time travel remains impossible, the idea could enhance conventional systems.

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