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UV damaged polypropylene rope (left) and new rope (right) UV degradation is one form of polymer degradation that affects plastics exposed to sunlight. The problem appears as discoloration or fading, cracking, loss of strength or disintegration. The effects of attack increase with exposure time and sunlight intensity.
Uranium pentafluoride is an intermediate in the conversion of uranium tetrafluoride to volatile UF 6: 2 UF 4 + F 2 → 2 UF 5 2 UF 5 + F 2 → 2 UF 6. It can be produced by reduction of the hexafluoride with carbon monoxide at elevated temperatures. [1] 2 UF 6 + CO → 2 UF 5 + COF 2. Other reducing agents have been examined. [2]
Beckman DU640 UV-Vis spectrophotometer. Ultraviolet–visible spectrophotometry (UV–Vis or UV-VIS) [1] [2] [3] refers to absorption spectroscopy or reflectance spectroscopy in part of the ultraviolet and the full, adjacent visible regions of the electromagnetic spectrum. [2]
The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn-producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.
UV light is electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays. UV is categorised into several wavelength ranges, with short-wavelength UV (UV-C) considered "germicidal UV". Wavelengths between about 200 nm and 300 nm are strongly absorbed by nucleic acids.
UF 6 reacts with water, releasing hydrofluoric acid. The compound reacts with aluminium, forming a surface layer of AlF 3 that resists any further reaction from the compound. Uranium hexafluoride is a mild oxidant. [10] It is a Lewis acid as evidenced by its binding to form heptafluorouranate(VI), [UF 7] −. [11]
This list of University of Florida alumni includes current students, former students, and graduates of the University of Florida in Gainesville, Florida. Honorary degree recipients can be found on the List of University of Florida honorary degree recipients, and notable administration, faculty, and staff are found on the List of University of Florida faculty and administrators.
4); UF 4 itself is prepared by hydrofluorination of uranium dioxide. [6] Reduction of UF 4 with hydrogen at 1000 °C produces uranium trifluoride (UF 3). Under the right conditions of temperature and pressure, the reaction of solid UF 4 with gaseous uranium hexafluoride (UF 6) can form the intermediate fluorides of U 2 F 9, U 4 F 17, and UF 5. [6]