Scheelite fluoresces bright blue only under short wave ultraviolet light, and ruby fluoresces bright red primarily under long wave ultraviolet. Some minerals will fluoresce one color under short wave and a different color under long wave. Calcite from Terlingua, Texas, is a spectacular example of ...
Germicidal ultraviolet disinfection is rapid, low-maintenance, and does not use chemicals or produce byproducts. To achieve proper disinfection of water, air, or surfaces, each medium must be exposed to UV-C light (at the wavelength of 254 nanometers) for an appropriate amount of time, dependi...
; this divergence for high frequencies is called the ultraviolet catastrophe. Max Planck explainedthe blackbody radiation in 1900by assuming that the energies of the oscillations of electrons which gave rise to the radiation must be proportional to integral multiples of the frequency, i.e., (1) W...
adhesive, etc., a UV aging test chamber is appropriate. It may mimic climatic conditions like ultraviolet radiation, rain, hot weather, high humidity, condensation, and nighttime. Reproducing these conditions combines them into a single cycle, which is then automatically carried out to finish numero...
[#insert3] Because Venus receives more heat from the Sun, water released from the interior evaporated and rose to the upper atmosphere where the Sun’s ultraviolet rays broke the molecules apart. [#insert4] Much of the freed hydrogen escaped into space, and Venus lost its water. Without ...
UPF stands for ultraviolet protection factor. According to Beckham, it’s a measure of “how much a material protects against exposure to the sun’s UV radiation.” The higher the UPF rating, the more UV radiation that material will block. So a UPF rating of 30+ is good, for example, ...
[5] Kimura Y, Sumiyoshi M. Olive leaf extract and its main component oleuropein prevent chronic ultraviolet B radiation-induced skin damage and carcinogenesis in hairless mice [J]. Journal of Nutrition, 2009,139(11):2079-2086. [6] Majewski G P, Singh S, Bo...
This printing technique involves using ultraviolet (UV) light to help “cure” the coating that is applied to protect the packaging (gloss or varnish). Not only does this help seal in the vividness of the color, but it also adds an additional layer of protection to the finished product. UV...
EEPROM (Electrically Erasable Programmable Read-Only Memory):EEPROM chips can also be rewritten multiple times but with an electric charge rather than ultraviolet light exposure. This type of chip is often found in mobile phones and flash drives where frequent updates may be necessary. ...
Over time, the rising temperatures would have leveled off, solar ultraviolet radiation having broken down atmospheric water vapor molecules into hydrogen and oxygen. With all the water vapor gone, the greenhouse effect would no longer have accelerated....