Posts Tagged: physics

The cosmic ray gun duel of Eta Carinae

The cosmic ray gun duel of Eta Carinae

High-precision X-ray observations confirm binary star system shoots cosmic rays     An international collaboration operating NASA’s NuSTAR satellite has revealed that two of the biggest stars in the galaxy are capable of creating cosmic rays. Their results were published in Nature Astronomy this month. In the time it takes you to read this sentence, hundreds of cosmic rays have pummeled through our bodies. Cosmic rays are mostly made of protons and electrons, with the smallest fraction made of X-rays and gamma rays. These jets of high-energy particles not only make up a sizable portion of radiation astronauts and airplane pilots receive, but they also can reach the ends of… Read more

X-ray technology reveals never-before-seen matter around black hole

X-ray technology reveals never-before-seen matter around black hole

X-ray polarimetry resolves shape of matter around Cygnus X-1 black hole     In an international collaboration between Japan and Sweden, scientists clarified how gravity affects the shape of matter near the black hole in binary system Cygnus X-1. Their findings, which were published in Nature Astronomy this month, may help scientists further understand the physics of strong gravity and the evolution of black holes and galaxies. Near the center of the constellation of Cygnus is a star orbiting the first black hole discovered in the universe. Together, they form a binary system known as Cygnus X-1. This black hole is also one of the brightest sources of X-rays in… Read more

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Next-generation illumination using silicon quantum dot-based white-blue LED

  A Si quantum dot (QD)-based hybrid inorganic/organic light-emitting diode (LED) that exhibits white-blue electroluminescence has been fabricated by Professor Ken-ichi SAITOW (Natural Science Center for Basic Research and Development, Hiroshima University), Graduate student Yunzi XIN (Graduate School of Science, Hiroshima University), and their collaborators. A hybrid LED is expected to be a next-generation illumination device for producing flexible lighting and display, and this is achieved for the Si QD-based white-blue LED. For details, refer to “White-blue electroluminescence from a Si quantum dot hybrid light-emitting diode,” in Applied Physics Letters; DOI: 10.1063/1.4921415. The Si QD hybrid LED was developed using a simple method; almost all processes were solution-based and conducted at… Read more