Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays. It can be subdivided into near UV (380–200 nm wavelength), far or vacuum UV (200–10 nm; abbrev. FUV or VUV), and extreme UV (1–31 nm; abbrev. EUV or XUV). When considering the effect of UV radiation on human health and the environment, the range of UV wavelengths is often subdivided into UVA (380–315 nm), also called Long Wave or " ...

Including:

• Ultraviolet - Discovery
• Ultraviolet - Health concerns and protection
• Ultraviolet - Skin
• Ultraviolet - Eye
• Ultraviolet - Immune system
• Ultraviolet - Beneficial effects
• Ultraviolet - Uses
• Ultraviolet - Black lights
• Ultraviolet - Fluorescent lamps
• Ultraviolet - Pest control
• Ultraviolet - Spectrophotometry
• Ultraviolet - Astronomy
• Ultraviolet - Analyzing minerals
• Ultraviolet - Photolithography
• Ultraviolet - Checking electrical insulation
• Ultraviolet - Sterilization
• Ultraviolet - Disinfecting drinking water
• Ultraviolet - Food Processing
• Ultraviolet - Fire detection
• Ultraviolet - Curing of adhesives and coatings
• Ultraviolet - Deterring Substance Abuse in Public Restrooms
• Ultraviolet - External link

Read more here: » Ultraviolet: Encyclopedia - Ultraviolet

See also:

Ultraviolet, Ultraviolet - Discovery, Ultraviolet - Health concerns and protection, Ultraviolet - Skin, Ultraviolet - Eye, Ultraviolet - Immune system, Ultraviolet - Beneficial effects, Ultraviolet - Uses, Ultraviolet - Black lights, Ultraviolet - Fluorescent lamps, Ultraviolet - Pest control, Ultraviolet - Spectrophotometry, Ultraviolet - Astronomy, Ultraviolet - Analyzing minerals, Ultraviolet - Photolithography, Ultraviolet - Checking electrical insulation, Ultraviolet - Sterilization, Ultraviolet - Disinfecting drinking water, Ultraviolet - Food Processing, Ultraviolet - Fire detection, Ultraviolet - Curing of adhesives and coatings, Ultraviolet - Deterring Substance Abuse in Public Restrooms, Ultraviolet - External link

Read more here: » Ultraviolet: Encyclopedia II - Ultraviolet - Uses

UV light has many various uses. Ultraviolet - Black lights. A black light is a lamp that emits long wave UV radiation and very little visible light. Fluorescent black lights are typically made in the same fashion as normal fluorescent lights except that only one phosphor is used and the normally clear glass envelope of the bulb is replaced by a deep bluish purple glass called Wood's glass. To thwart counterfeiters, sensitive documents (e.g. credit cards, drivers licenses, passports) may also include a UV watermark that can only be seen when viewed under a UV-emitting light. Ult ...

See also:

Ultraviolet, Ultraviolet - Discovery, Ultraviolet - Health concerns and protection, Ultraviolet - Skin, Ultraviolet - Eye, Ultraviolet - Immune system, Ultraviolet - Beneficial effects, Ultraviolet - Uses, Ultraviolet - Black lights, Ultraviolet - Fluorescent lamps, Ultraviolet - Pest control, Ultraviolet - Spectrophotometry, Ultraviolet - Astronomy, Ultraviolet - Analyzing minerals, Ultraviolet - Photolithography, Ultraviolet - Checking electrical insulation, Ultraviolet - Sterilization, Ultraviolet - Disinfecting drinking water, Ultraviolet - Food Processing, Ultraviolet - Fire detection, Ultraviolet - Curing of adhesives and coatings, Ultraviolet - Deterring Substance Abuse in Public Restrooms, Ultraviolet - External link

Read more here: » Ultraviolet: Encyclopedia II - Ultraviolet - Uses

In physics, an ultraviolet divergence is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with very high energy approaching infinity, or, equivalently, because of physical phenomena at very short distances. An infinite answer to a question that should have a finite answer is a potential problem. The ultraviolet (UV) divergences are often unphysical effects that can be removed by regularization and renormalization. If they cannot be removed, they imply ...

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Violet (named after the flower violet) refers to any of a group of reddish blue or bluish purple colors. In particular, it refers to the color of light at the short-wavelength end of the visible spectrum. Its wavelength range is approximately 420-380 nanometres. True spectral violet cannot be reproduced on a computer screen. You can see the color by looking at the reflection of a fluorescent tube in a compact disc. See also. Ultraviolet List of colors Purple — in par ...

Including:

• Violet color - Shades

Read more here: » Violet color: Encyclopedia - Violet color

Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). It uses light in the visible and adjacent near ultraviolet (UV) and near infrared (NIR) ranges. In this region of energy space molecules undergo electronic transitions. UV/VIS spectroscopy - Beer-Lambert Law. The method is used in a quantitative way to determine concentrations of an absorbing species in solution, using the Beer-Lambert law: ...

Including:

• UV/VIS spectroscopy - Beer-Lambert Law
• UV/VIS spectroscopy - UV/ VIS spectrophotometer
• UV/VIS spectroscopy - Ultraviolet-Visible spectrum
• UV/VIS spectroscopy - Types of spectrophotometers

Read more here: » UV/VIS spectroscopy: Encyclopedia - UV/VIS spectroscopy

Clementine was a joint space project between the Ballistic Missile Defense Organization (BMDO, previously the Strategic Defense Initiative Organization, or SDIO) and NASA. The objective of the mission was to test sensors and spacecraft components under extended exposure to the space environment and to make scientific observations of the Moon and the near-Earth asteroid 1620 Geographos. The Geographos observations were not made due to a malfunction in the spacecraft. The lunar observations made included imaging at various wavelengths i ...

Including:

• Clementine mission - Spacecraft design
• Clementine mission - Mission
• Clementine mission - Science instruments
• Clementine mission - Charged Particle Telescope CPT
• Clementine mission - Ultraviolet/Visible camera
• Clementine mission - Near-Infrared CCD Camera NIR
• Clementine mission - Laser Image Detection and Ranging LIDAR System
• Clementine mission - High-Resolution Camera HIRES

Read more here: » Clementine mission: Encyclopedia - Clementine mission

The Cat's Eye Nebula. Composite image using optical images from the HST and X-ray data from the Chandra X-ray Observatory The Cat's Eye Nebula (NGC 6543) is a planetary nebula in the constellation of Draco. Structurally, it is one of the most complex nebulae known, with high resolution Hubble Space Telescope observations revealing remarkable structures such as knots, jets and sinewy arc-like features. It was discovered by William Herschel on February 15, 1786, and was the first planetary nebula whose spectrum was investigated, by ...

Including:

• Cat's Eye Nebula - General information
• Cat's Eye Nebula - Observations
• Cat's Eye Nebula - Infrared observations
• Cat's Eye Nebula - Optical and ultraviolet observations
• Cat's Eye Nebula - X-ray observations
• Cat's Eye Nebula - Distance
• Cat's Eye Nebula - Age
• Cat's Eye Nebula - Composition
• Cat's Eye Nebula - Kinematics and morphology
• Cat's Eye Nebula - Open questions

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UV astronomy is the branch of astronomy and astrophysics which deals with objects visible in ultraviolet (UV) radiation. UV radiation ranges approximatively from 10nm (extreme UV) to 380nm (near UV). Ultraviolet line spectrum measurements are used to discern the chemical composition, densities, and temperatures of interstellar medium, and the temperature and composition of hot young stars. UV observations can also provide ess ...

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Uva is a three-letter abbreviation with multiple meanings, as described below: Uva Province in Sri Lanka Uva is a parish in the municipality of Vimioso ultraviolet-A rays (UV-A) Ultraviolet Light Absorber University of Virginia (UVa), in the USA Universiteit van Amsterdam (UvA), one of the two universities in Amsterdam, the Netherlands United Virtual Airlines, a simulated airline based on operations of the real-world United Airlines Non-acronym usage: Uva (anatomy) is the pigmented layer of the ...

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A B C D E F G H I J K L M G P L S C X Ku K Ka V W The A band is the range of radio frequencies up to 0.25 GHz in the electromagnetic spectrum. This is equal to wave lengths greater than 1.2 m. See also. Gamma ray | X-ray | Ultraviolet | Optical spectrum | Infrared | Terahertz radiation | Microwave | Radio waves Optical (visible) spe ...

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A welder is a tradesman who specialises in welding materials together. The materials to be joined can be metals (such as steel, aluminium, brass, stainless steel etc.) or varieties of plastic or polymer. Welders typically have to have good dexterity and attention to detail. Depending upon the type of welding being undertaken, various safety precautions must be taken. Hazards caused by heat and flames are fairly obvious, the intense ultraviolet light p ...

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Actinism is a property of radiation (particularly solar radiation) that leads to the production of photochemical effects. Actinism is derived from Greek with the meaning a radiant force. The word actinism seems to be used particularly in terms of imaging technology especially photography although it is used in medical literature for photo-biochemical effects such as a sunburn or radiation exposure from ultraviolet rays and in chemistry for containers that protect from photo-degradation. Chemical photography and ...

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In chemistry, anthracene is a solid polycyclic aromatic hydrocarbon consisting of three benzene rings derived from coal-tar. Anthracene is used in the artificial production of the red dye alizarin. It is also used in wood preservatives, insecticides, and coating materials. Anthracene is colorless but exhibits a blue fluorescence under ultraviolet light. Anthracene has the ability to photodimerize with irradiation by UV light. This results in considerable cha ...

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Aerial survey is a method of collecting information by utilising aerial photography or from remote sensing technology using other bands of the electromagnetic spectrum, such as infrared, gamma, or ultraviolet. It can also refer to the chart or map made by analysing a region from the air. This is typically done using satellites, aircraft, balloons, or kites. Aerial surveys can provide information on many things not visible from the ground. Aerial surveys are used for: Land survey Mining Archaeology Monitoring wildlife and insect populations, ...

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Benitoite, whose name derives from its type locality (San Benito County, California) is a blue silicate mineral, found in hydrothermally altered serpentinite. Benitoite fluoresces under ultraviolet light, appearing light blue in color. Benitoite - Uses of benitoite. Benitoite's rarity makes it a minor ore for barium or titanium at best. Rather, benitoite's main uses are as collector's specimens, especially in specimens which show off this mineral's unique crystals, or specimens in which benitoite occurs wit ...

Including:

• Benitoite - Uses of benitoite
• Benitoite - Associated minerals
• Benitoite - Notes for identification
• Benitoite - Trivia

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CR-39, or allyl diglycol polycarbonate, is a plastic polymer commonly used in the manufacture of eyeglass lenses. An alternative use includes a purified version that is used to measure neutron radiation, a type of ionizing radiation, in neutron dosimetry. The CR stands for Columbia Resin. CR-39 is transparent in visible spectrum and almost completely opaque in infrared and ultraviolet range, it has high abrasion resistance, about half the weight of glass and index of refraction only slightly lower than that of cro ...

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Zinc oxide is a chemical compound with formula ZnO. It is nearly insoluble in water but soluble in acids or alkalis. It occurs as white hexagonal crystals or a white powder commonly known as zinc white. It remains white when exposed to hydrogen sulfide or ultraviolet light. Crystalline zinc oxide exhibits the piezoelectric effect, is luminescent (it will change colour from white to yellow when heated, and back again when cooled down), and is light sensitive. Zinc oxide occurs in nature as the mineral zincite. Zinc peroxide, ZnO2 .½ H2O, is a whi ...

Including:

• Zinc oxide - Pyroelectric coefficient

Read more here: » Zinc oxide: Encyclopedia - Zinc oxide

Irritation, in biology and physiology, is a state of over-excitation or hyper-reactivity. A stimulus or agent which induces the state of irritation is an irritant. Irritants are typically thought of as chemical agents (for example phenol and capsaicin) but mechanical, thermal (heat) and radiative stimuli (for example ultraviolet light or ionising radiations) can also cause irritation. Irritation - Irritation in Organisms. In higher organisms the allergic response may be cause of irrita ...

Including:

• Irritation - Irritation in Organisms
• Irritation - Mating
• Irritation - See Also

Read more here: » Irritation: Encyclopedia - Irritation

Color psychology is a field of study devoted to analyzing the effect of color on human behavior and feeling, distinct from phototherapy (the use of ultraviolet light to cure infantile jaundice). Color psychology is an immature field of study viewed dubiously by mainstream psychologists and therefore qualifies as "alternative medicine". Critics view it as an overstatement of what can be justified by research, and point out that different cultu ...

Including:

• Color psychology - Cultural contexts of colors
• Color psychology - Criticism

Read more here: » Color psychology: Encyclopedia - Color psychology