This collection of papers is from the fourth international meeting on scanning macro-X-ray fluorescence (MA-XRF) on cultural heritage art objects held in Washington DC. This meeting was expanded to ...

Spectroscopy is an analytical technique that measures the interaction between electromagnetic radiation (or other energetic probes, such as electrons or ions) and matter as a function of wavelength, ...

California company plans to place 4,000 "sky mirrors" in Earth orbit that will brighten skies over cities, alarming ...