These beads are coated with a special coating during the manufacture of the glass beads. In the rainy and foggy weather, the moisture can not easily adhere on the surface of glass beads, so the effection on reflectivity caused by bad weather will be reduced. The granulometry of this type glass beads is the same as non-coated glass beads.
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
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This dying star has already begun to burn inside, emitting a gas “blister†and forming a halo clearly visible. This star named Camelopardis is about to end its life, but because it is far away from the earth, it is displayed in a normal picture at the size of a pixel. However, the brightness of the gas shell emitted from the core allows the Hubble Space Telescope's sensor to capture this spectacular picture. Camelopardis, referred to as U Cam, is a star whose life is about to end.
As early as early March, NASA’s Hubble Space Telescope discovered a huge block of dark matter in the “Abel 520†galaxy cluster 2.4 billion light-years away from Earth. This anomalous discovery made astronomers puzzled and suspected that there may be a mysterious “dark matter core†in the dark matter block. On February 4, 2004, the Hubble Space Telescope observed the collision of two black holes. When a collision occurs, a black hole that is affected by a powerful gravitational radiation explosion will be kicked out, instead of combining them to form a larger one as people think. Black hole. It must be said that the Hubble Space Telescope has made indelible contributions to discovering stars and exploring the universe.
Hubble Space Telescope Photographs Cosmic Spectacle
The Hubble Space Telescope (HST) is a telescope orbiting the earth in the name of the astronomer Edwin Powell Hubble. Its location is above the earth's atmosphere, so it has the advantage that the ground-based telescope does not have - the image is not disturbed by the atmospheric turbulence, the visual phase is excellent, there is no background light caused by atmospheric scattering, and observation can be absorbed by the ozone layer. UV rays. After launching in 1990, it has become the most important instrument in the history of astronomy. The Hubble Space Telescope recently captured a picture of the universe resembling a human cornea. Actually, it is just the last “situation†of a dying star.