Getting your first telescope should feel exciting, not frustrating. If I avoid a few common beginner mistakes, I can turn ...

The radius of the particles in the outflow from 3I/ATLAS must be bigger than 1 micron in order for them to reach the observed ...

I/ATLAS’s enigma continues as its closest approach to Earth is nigh ...

The 400,000-kilometre anti-tail of 3I/ATLAS is one of the most remarkable aspects that have ever been seen on an interstellar object. The particles in it are too large to be typical cometary dust, and ...

It leads off with a statistic that sounds almost trivial but masks a profoundly puzzling problem: interstellar comet 3I/ATLAS ...

Abstract: Collimation and focusing are generally more common in optics field. We demonstrate hyperbolic metamaterials (HMMs) with very flat isofrequency surfaces in wavevector space for tunneling of ...

Abstract: Air-coupled ultrasound (ACU) is increasingly used for nondestructive testing (NDT). With ACU, no contact or coupling agent (e.g., water and ultrasound gel) is needed between transducers and ...

The objective of this study, which is related to human brain SPECT, was to increase the sensitivity of a triple-camera SPECT system and reduce statistical noise in reconstructed images using a ...

Before CT came into use, planar radiography and fluoroscopy comprised all non–nuclear medicine uses of ionizing radiation in imaging. In those types of examinations, the radiation dose to the patient ...

Vous vous souvenez que, dans la première partie du dossier, à la fin de la section sur les joysticks à effet Hall, il fallait déjà tout oublier tant l’industrie avançait vite, et que d’autres technolo ...

Furnas, T. C., “The Development of Focusing X-ray Cameras for Use at Small Diffraction Angles” (Mass. Inst. Tech. thesis, 1952).