Overexposure to UVB radiation not only can cause sunburn but also some forms of skin cancer. Tunable VUV wavelengths down to 75nm was achieved using window-free configurations.[44]. [64] During the Ugandan-Tanzanian War of 1978 to 1979, Libya sent an expeditionary military force to aid Ugandan dictator Idi Amin in his conflict with Tanzania, which included the supply of a few dozen T-54/55 tanks. On Easter Sunday, 2 April 1972, the newly activated 20th Tank Regiment of the ARVN, comprising approximately 57 M48A3 Patton main battle tanks (note that ARVN regiments were equivalent to US battalions, and ARVN squadrons were equivalent to US companies or troops)[34] received reports from friendly intelligence units of a large NVA armoured column moving towards Dong Ha, the largest South Vietnamese city near the Vietnamese DMZ located on the 17th Parallel. Volume XXIV, January, 1978, "Ethiopian-Somali Conflict. American racecar driver and constructor Ray Harroun was an early pioneer of the concept of a lightweight single-seater, open-wheel "monoposto" racecar. The T-54 and T-55 have a cabin layout shared with many post-World War II tanks, with the fighting compartment in the front, engine compartment in the rear, and a dome-shaped turret in the center of the hull. UV (3,000 hours); Some wall-mounted indoor units have two UV bulbs. The Kosovo Liberation Army (National Liberation Army of Kosovo) captured a T-55 from the Macedonian army during the battle of Radua.[67]. He was then hired by the Marmon Motor Car Company as DynaTrap insect traps are versatile and effective. Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; [17], The electromagnetic spectrum of ultraviolet radiation (UVR), defined most broadly as 10400nanometers, can be subdivided into a number of ranges recommended by the ISO standard ISO 21348:[18], Several solid-state and vacuum devices have been explored for use in different parts of the UV spectrum. Late production models had rubber side skirts and a driver's windshield for use during longer stints. In a tweet, the ministry added that over 1,400 drones have been shot down alongside 201 air defence systems. [67][68] The amount of sunscreen that penetrates into the lower layers of the skin may be large enough to cause damage.[69]. [113], Reptiles need UVB for biosynthesis of vitamin D, and other metabolic processes. ", 10.1002/1097-0215(20000701)87:1<145::AID-IJC22>3.0.CO;2-3, "Do sunscreens increase or decrease melanoma risk: An epidemiologic evaluation", "Commentary: Cancer-preventive effects of sunscreens are uncertain", "Sunscreen enhancement of UV-induced reactive oxygen species in the skin". Due to your consent preferences, youre not able to view this. The 100mm gun fired BR-412 series full-calibre APHE ammunition, which had superior penetration ability when compared to the T-34 that it replaced. After a two-day-long intense artillery barrage, eighteen T-54 tanks from the NVA side attacked the South Vietnamese infantry camp at dawn from two different directions, thus breaking apart the ARVN unit into two and splitting up its forces, which quickly abandoned its positions and withdrew. The strongest ultraviolet lines are at 337.1nm and 357.6nm in wavelength. Most DynaTrap models twist open while keeping the insects trapped, so those that are still alive cant escape while you clean the device. T-54 and T-55 tanks continued to be upgraded, refitted, and modernised into the 1990s. Most of them were for export. T-54/55 participated in the biggest tank battle of the war in early 1981. Many enzymes and proteins involved in modern mitosis and meiosis are similar to repair enzymes, and are believed to be evolved modifications of the enzymes originally used to overcome DNA damages caused by UV.[116]. Light: UV light is often the first thing that attracts insects to traps. SPF is, therefore, also called UVB-PF, for "UVB protection factor". A prototype of the new design, about 40 centimetres (16in) longer and only 10cm wider, was completed in 1945. Significant examples include 193-nm photolithography equipment (for semiconductor manufacturing) and circular dichroism spectrometers. 1 (5), "The Ministry of Defense Sells T-62 in 2013", Foreign Relations, 19691976, Volume XXIV. The advantages are low VOC emissions and rapid curing. The Omsk OKB-29 group tested three experimental T-55 tanks (designated Ob'yekt 612) between 1962 and 1965 that were fitted with an automatic gearbox controlled by electro-hydraulic systems. Another prototype upgrade package was produced by Teledyne Continental Motors (now General Dynamics Land Systems) for the Egyptian Army and was known as the T-54E. For an American tank prototype from the same era, see, "T-55" redirects here. Battle of Basantar or the Battle of Barapind (December 416, 1971) was one of the vital battles fought as part of the Indo-Pakistani War of 1971 in the western sector of India. Thus, the use of titanium dioxide and UVC requires very specific parameters for a successful outcome. Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays.UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.It is also produced by electric arcs and By the time the T-44 was ready for production, the T-34 had also been modified to fit the same gun. The war in Ukraine is an ongoing conflict which could "flare up and die down for a generation", Professor Michael Clarke, former director-general at the Royal United Services Institute has said. However, the reaction of titanium dioxide and UVC is not a straight path. The Moon is a planetary-mass object that formed a The current warming trend is different because it is clearly the result of human activities since the mid-1800s, and is proceeding at a rate not seen over many recent millennia. Synchrotron light sources can also produce all wavelengths of UV, including those at the boundary of the UV and Xray spectra at 10nm. It can be placed anywhere, but positioning it too close to your living area may attract bugs to you rather than the trap. As in most tanks of that generation, the internal ammunition supply is not shielded, increasing the risk that any enemy penetration of the fighting compartment could cause a catastrophic secondary explosion. Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm[1] (with a corresponding frequency around 30PHz) to 400nm (750THz), shorter than that of visible light, but longer than X-rays. LED grow lamps are the Argon and deuterium arc lamps are often used as stable sources, either windowless or with various windows such as magnesium fluoride. Simple NUV sources can be used to highlight faded iron-based ink on vellum. Check out our Best LED Grow Light Comparison Review Test for third-party laboratory data on efficiency, output, PAR charts, and more. Some lamps use a deep-bluish-purple Wood's glass optical filter that blocks almost all visible light with wavelengths longer than 400nanometers. Let LED lights grow your plants efficiently. Check out the GrowersHouse selection of California Light Works LEDs, which are engineered for higher potency when used in greenhouses or indoor gardens. Steam is a substance containing water in the gas phase, and sometimes also an aerosol of liquid water droplets, or air. Flylight is designed mainly to trap flies or other flying insects and features UV light and replaceable StickyTech flypaper. Microsofts Activision Blizzard deal is key to the companys mobile gaming efforts. Vacuum UV, or VUV, wavelengths (shorter than 200nm) are strongly absorbed by molecular oxygen in the air, though the longer wavelengths around 150200nm can propagate through nitrogen. CO2 emitted by unique finish to attract mosquitoes, Vacuum fan mechanism to trap nearby insects. DynaTrap models feature different bulb options that function in the same way but have different lifespans. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [17] The Soviets considered this acceptable for a potential European conflict, until the development of composite armour began reducing the effectiveness of HEAT warheads and kinetic energy penetrator sabot rounds were developed for the D-10T gun. Thus, the optimum spectral portion can be found for distinguishing ink from paper on the papyrus surface. The tank was fitted with an external camera, the picture from which was relayed to a receiver in a BTR-50PU command vehicle. [6], Ultraviolet rays are invisible to most humans. "Why Three Tanks?" Just like many developing countries around the world which continue to operate the T-54/55, at least 900 T-54s, along with a similar number of T-55s and Type 59s, are still in active military service with the Socialist Republic of Vietnam until the present day. Many fruits, flowers, and seeds stand out more strongly from the background in ultraviolet wavelengths as compared to human color vision. The current[timeframe?] Butterflies use ultraviolet as a communication system for sex recognition and mating behavior. In 1951, a second modernization was made, designated T-54-3 (Ob'yekt 137Sh), which had a new turret without side undercuts, and the new TSh-2-22 telescopic gunner's sight instead of the TSh-20. [69], Russia announced that several T-55 tanks used by ISIL in Syria were destroyed in an air attack conducted by its forces on October 5, 2015. Let LED lights grow your plants efficiently. The green fluorescent protein (GFP) is often used in genetics as a marker. Light: UV light is often the first thing that attracts insects to traps. Ultraviolet can be detected by suitable photodiodes and photocathodes, which can be tailored to be sensitive to different parts of the UV spectrum. [48], Vitamin D promotes the creation of serotonin. UVA gives a quick tan that lasts for days by oxidizing melanin that was already present and triggers the release of the melanin from melanocytes. [16] The T-55's dependability and ruggedness proved well-suited to the local combat environments. Because of its ability to cause chemical reactions and excite fluorescence in materials, ultraviolet radiation has a number of applications. There, it traps between 30 and 36 percent of its own weight in moisture, and it is for this reason that sheepskin is commonly used to make chamois leather. [106] Since microorganisms can be shielded from ultraviolet rays in small cracks and other shaded areas, these lamps are used only as a supplement to other sterilization techniques. In 1943, the Morozov Design Bureau resurrected the pre-war T-34M development project and created the T-44 tank. Let LED lights grow your plants efficiently. [26] During total overcast, the amount of absorption due to clouds is heavily dependent on the thickness of the clouds and latitude, with no clear measurements correlating specific thickness and absorption of UVB.[27]. Abundance and age together make these tanks cheap and easy to purchase.[18]. Electricity is generated when the concentrated light is converted to heat (solar thermal energy), which drives a heat engine (usually a steam turbine) connected to an If one of the lasers is resonant with a transition in the gas or vapor then the VUV production is intensified. The best LED grow lights at the lowest prices. In recent weeks, Russian drone and missile attacks have badly damaged the electricity grid in and around the capital. The older T-54 can be distinguished from the T-55 by a dome-shaped ventilator on the front right of the turret and a driver-operated SGMT 7.62mm machine gun mounted to fire through a tiny hole in the center of the hull's front. [5] Its development never stopped throughout the Second World War and it continued to perform well; however, the designers could not incorporate the latest technologies or major developments as vital tank production could not be interrupted during wartime. The war in Ukraine is an ongoing conflict which could "flare up and die down for a generation", Professor Michael Clarke, former director-general at the Royal United Services Institute has said. Sensitive polymers include thermoplastics and speciality fibers like aramids. [38] The NVA destroyed 18 M41 light tanks together with 31 M113 APCs and captured 17 M41s as intact, while losing only two T-54 tanks and one PT-76 tank in the armoured skirmish. Waiting for the NVA tank column to close to between 2500 and 3000 meters, the 90mm main guns of the Patton tanks opened fire and quickly destroyed nine PT-76s and two T-54 tanks. UVB photons can cause direct DNA damage. The risk is elevated at high altitudes and people living in high latitude areas where snow covers the ground right into early summer and sun positions even at zenith are low, are particularly at risk. [81], Protective eyewear is beneficial to those exposed to ultraviolet radiation. [77] The study indicates that sunscreen must be reapplied within 2hours in order to prevent UV light from penetrating to sunscreen-infused live skin cells. In the first 20minutes, the film of sunscreen had a protective effect and the number of ROS species was smaller. He added that it is impossible to establish the number of victims in Mariupol and Volnovas, which remain under Russian occupation. P.342, Learn how and when to remove this template message, South African National Museum of Military History, United Nations Force Intervention Brigade, Sudanese conflict in South Kordofan and Blue Nile, "The Economics of Soviet Arms Transfers to the Third World. Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. 38.88 litre diesel, 14.6 horsepower per metric ton (10.9kW/t), 580 L internal, 320 L external (less on early T54), 400 L jettisonable rear drums, 325 kilometres (202mi), 610 kilometres (380mi) with extra tanks (on unpaved roads), 35,000 T-54 and 27,500 T-55 (by Soviet Union), 120 mm hull front at 60 (100mm after 1949). He was then hired by the Marmon Motor Car Company as The Sun emits ultraviolet radiation at all wavelengths, including the extreme ultraviolet where it crosses into X-rays at 10nm. [90], Ultraviolet light helps detect organic material deposits that remain on surfaces where periodic cleaning and sanitizing may have failed. The MoD added that Russian generals likely wanted their commanders to use weapons against deserters - and likely wanted to maintain defensive positions to the death. Stands out for the indoor design that features slim construction and a 1000-sq. James Kinnear, Stephen Sewell, Andrey Aksenov, This page was last edited on 21 October 2022, at 12:35. [4] The UV spectrum, thus, has effects both beneficial and harmful to life. A Ukrainian official said eight civilians were killed in the region yesterday: five in Bakhmut, one in Pokrovsk, one in Nelipivka and one in Krasnohorivka. Nevertheless, the photoreceptors of the retina are sensitive to near-UV, and people lacking a lens (a condition known as aphakia) perceive near-UV as whitish-blue or whitish-violet. The gunner received a TNP-165 vision device. There is a T-54 outside of K-W Surplus in Kitchener, Ontario, Canada. Lancer Publishers, 2016. [35] The fused quartz tube passes the 253.7nm radiation but blocks the 185nm wavelength. It had thicker hull armour (80mm on the sides, 30mm on the roof and 20mm on the bottom). [39], At the very end of the Vietnam War on the 30 April 1975, an NVA T-54 tank smashed through the opulent main gate of the RVN Presidential Palace in their capital city of Saigon, accompanied by onrushing North Vietnamese troops, at the conclusion of North Vietnam's conquering of the South. During the Vietnam War, the North Vietnamese Army (NVA) used T-54s, along with its Chinese-built copy (the Type 59), extensively against the South Vietnamese ARVN and their allied US forces. In one case, a squadron of T-55s stopped the advance of a large Jordanian column, with 19 Centurions destroyed and up to 10 Syrian T-55s lost in the battle. Make sure to follow DynaTraps positioning recommendations to ensure maximum efficiency. 285 T-54-1 tanks were built in 1948 by Stalin Ural Tank Factory No. Buying guide for Best DynaTrap insect traps, DynaTrap insect trap features to consider. (, Arabs at War: Military Effectiveness, 19481991. A Marconi fire control system which was originally developed for the American light tank Stingray was fitted. Presently, UV argon-fluoride excimer lasers operating at 193nm are routinely used in integrated circuit production by photolithography. Israel captured many from Egypt in 1967, along with a few T-55s from Syria, and kept some of them in service. Urine trails of rodents can be detected by pest control technicians for proper treatment of infested dwellings. It was decided to increase the tank's abilities by changing its construction and introducing new production technologies. Keep in mind that a trap with too big a range can actually have the opposite effect and attract insects to your yard or patio, so choose the appropriate coverage for your needs. It's also the most expensive the brand has to offer. The documentation was sent to Uralvagonzavod. A wide array of upgrades in different price ranges are provided by many manufacturers in different countries, intended to bring the T-54/55 up to the abilities of newer MBTs, at a lower cost. To allow easier access during maintenance and repairs, it was decided to change hatches over the engine compartment. captive species to survive. [51], UV rays also treat certain skin conditions. Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays.UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.It is also produced by electric arcs and A CRT on a television set is commonly called a picture tube. At ground level with the sun at zenith, sunlight is 44% visible light, 3% ultraviolet, and the remainder infrared. LED lights for growing are semiconductors that emit lightthe letters are for Light-Emitting Diodes. [77][67][68][78] The amount of sunscreen that penetrates through the stratum corneum may or may not be large enough to cause damage. During the last four months of production, the new tanks were equipped with an L-2 "Luna" infrared searchlight, a TPN-1-22-11 IR gunner's sight, and an OU-3 IR commander's searchlight. [citation needed], Together, the T-54/55 tanks have been manufactured in the tens of thousands, and many still remain in reserve, or even in front-line use among lower-technology fighting forces. [7], In the beginning of the 1950s, the personnel of the OKB-520 design bureau of the Stalin Ural Tank Factory No. [citation needed], Suspended nanoparticles in stained-glass prevent UV rays from causing chemical reactions that change image colors. The extra-large size provides a range of up to 1 acre and its fan and UV light help trap insects quietly. Technology for VUV instrumentation was largely driven by solar astronomy for many decades. In biological research, UV radiation is used for quantification of nucleic acids or proteins. [21], During the 1967 Six-Day War, U.S.-supplied M48 Patton tanks, British Centurion tanks, and even upgraded World War IIera Sherman tanks faced T-55s. UVB also plays a major role in plant development, as it affects most of the plant hormones. Pragmatic Adaptation: Because of the small amount of episodes allotted to it (ten regular episodes plus one BR-exclusive OAV), the anime had to skip or rearrange some of the gang's misadventures. These low-pressure lamps have a typical efficiency of approximately 3040%, meaning that for every 100watts of electricity consumed by the lamp, they will produce approximately 3040watts of total UV output. The Moon is Earth's only natural satellite.Its diameter is about one-quarter the diameter of the Earth (comparable to the width of Australia). Despite somewhat thinner frontal turret armour (200 millimetres (7.9in) instead of 250 millimetres (9.8in)) it compared favourably with the IS-3, due to its improved antitank gun and better mobility. [61] Those pyrimidine dimers that escape this repair process can induce a form of programmed cell death (apoptosis) or can cause DNA replication errors leading to mutation. [16], The discovery of the ultraviolet radiation with wavelengths below 200nm, named "vacuum ultraviolet" because it is strongly absorbed by the oxygen in air, was made in 1893 by German physicist Victor Schumann. They are very simple to operate compared to Western tanks, and do not require a high level of training or education in their crewmen. Not good for outdoor use. [25] The fraction of UVB which remains in UV radiation after passing through the atmosphere is heavily dependent on cloud cover and atmospheric conditions. The spacious catch cage doesn't require dumping as frequently as smaller traps. There, it traps between 30 and 36 percent of its own weight in moisture, and it is for this reason that sheepskin is commonly used to make chamois leather. The tank was equipped with a full PAZ/FVU chemical filtration system. We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Some of these tanks saw action against Tanzanian forces.,[65] with at least limited success. The main issue was a larger turret ring, which suggested slightly enlarging the hull. According to the Pentagon, during the 1975 Spring Offensive, the ARVN forces lost 250 M48A3 tanks, 300 M41 tanks, 1,381 M113 APCs, 1,607 guns, 200 RCL guns and 63,000 M72 LAWs. However, the degree of redness and eye irritation (which are largely not caused by UVA) do not predict the long-term effects of UV, although they do mirror the direct damage of DNA by ultraviolet. The cheaper and more common 395nm UV LEDs are much closer to the visible spectrum, and give off a purple color. magnesium). Medical organizations recommend that patients protect themselves from UV radiation by using sunscreen. A. DynaTrap insect traps are designed to be on 24/7. The T-54 and T-55 tanks are a series of Soviet main battle tanks introduced in the years following the Second World War.The first T-54 prototype was completed at Nizhny Tagil by the end of 1945. Chat w/ GrowExpert | Call: 1.855.289.1441. Neal G. Jesse, John R. Dreyer. Pragmatic Adaptation: Because of the small amount of episodes allotted to it (ten regular episodes plus one BR-exclusive OAV), the anime had to skip or rearrange some of the gang's misadventures. The T-55 tank remained the most common tank in the armies of the various Yugoslavian successor states until recently and it was the most-used tank by all armies during the decades-long wars. UV-C LEDs are relatively new to the commercial market and are gaining in popularity. These are cheaper but very inefficient, emitting only a small fraction of a percent of their power as UV. Contaminants in the indoor environment are almost entirely organic carbon-based compounds, which break down when exposed to high-intensity UV at 240 to 280nm. The tank was fitted with the new V-55 12-cylinder four-stroke one-chamber, 38.88-litre water-cooled diesel engine developing 581hp (433kW). Another type of high-power gas lasers are excimer lasers. However, resonances also generate wavelength dispersion, and thus the phase matching can limit the tunable range of the 4wave mixing. Suitable for indoor and outdoor use and durable against weather. All the brands we stock are field-tested and proven to work under the harshest conditions. For example, in the Colias eurytheme butterfly, males rely on visual cues to locate and identify females. Other UV sources with more continuous emission spectra include xenon arc lamps (commonly used as sunlight simulators), deuterium arc lamps, mercury-xenon arc lamps, and metal-halide arc lamps. DynaTrap brand insect traps utilize a three-way system to coax and trap insects so you and yours can keep on enjoying summer days and nights. P.130,131, Fulgham, David, Terrence Maitland, et al. We cover everything there is to know about the companys insect traps and detail the advantages of this pest control tool. UV-capable spectrophotometers are common in such laboratories. The term can refer to a television set, or the medium of television transmission.Television is a mass medium for advertising, entertainment, news, and sports.. Television became available in crude experimental forms in the late 1920s, but only after The brand's middle-of-the-road model and a good choice for most consumers who have neither a lot of land nor a big yard to cover. German Chancellor Olaf Scholz has met China's President Xi Jinping during a one day visit to Beijing. [63] UVC is the highest-energy, most-dangerous type of ultraviolet radiation, and causes adverse effects that can variously be mutagenic or carcinogenic. Fluorescent UV bulb attracts insects to the lamp, and vacuum fan sucks flying insects in without the use of disruptive zapping mechanism. The images may represent electrical waveforms (oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena. 183 (Uralvagonzavod); by then it had completely replaced T-44 production at Uralvagonzavod, and Kharkiv Diesel Factory No. It was later ported to Linux, macOS, iOS, and Android, where it is the default browser. Allow at least 3 weeks for trap to catch enough mosquitos to make a difference. Ultraviolet radiation is used for very fine resolution photolithography, a procedure wherein a chemical called a photoresist is exposed to UV radiation that has passed through a mask. The excimer lamp, a UV source developed in the early 2000s, is seeing increasing use in scientific fields. The cell is the basic structural and functional unit of life forms.Every cell consists of a cytoplasm enclosed within a membrane, and contains many biomolecules such as proteins, DNA and RNA, as well as many small molecules of nutrients and metabolites.The term comes from the Latin word cellula meaning 'small room'.. [52][53] In addition, UV light, in particular UVB radiation, has been shown to induce cell cycle arrest in keratinocytes, the most common type of skin cell. In ultraviolet astronomy, measurements are used to discern the chemical composition of the interstellar medium, and the temperature and composition of stars. Instead, the designers continued to use the design as the basis for further improved guns, experimenting with a 122mm design, but later deciding a 100mm gun was a better alternative. The engine was to be started pneumatically with the use of an AK-150S charger and an electric starter. It was installed in the interior, requiring the driver's hatch and the coamings over the turret hatches to be noticeably enlarged. DynaTrap brand traps utilize all three of the most common lures. Most of these problems were corrected in the otherwise largely identical T-55 tank. The ISW said their full withdrawal from the area "would be a clearer indicator that Russian forces will not fight for Kherson City or settlements on the right bank". One of these upgrade packages was produced by Cadillac Gage Textron and a prototype named the Jaguar was produced. 2016. [citation needed], It is a known problem that high levels of output of the UVa part of the spectrum can both cause cellular and DNA damage to sensitive parts of their bodies especially the eyes where blindness is the result of an improper UVa/b source use and placement photokeratitis. For example, a poly(methyl methacrylate) surface can be smoothed by vacuum ultraviolet.[101]. Learn how to do just about everything at eHow. [54] As such, sunlight therapy can be a candidate for treatment of conditions such as psoriasis and exfoliative cheilitis, conditions in which skin cells divide more rapidly than usual or necessary. The production of serotonin is in direct proportion to the degree of bright sunlight the body receives. 1 It is undeniable that human activities have produced the atmospheric gases that have trapped more of the Suns energy in the Earth system. LED grow lamps are the Poland produced 3,000 T-54, T-54A, T-54AD and T-54AM tanks between 1956 and 1964 and 7,000 T-55 (between 1964 and 1968), T-55L, T-55AD-1 and T-55AD-2 tanks (between 1968 and 1979). They were upgraded with a 105mm NATO-standard L7 or M68, a US version of the L7, replacing the old Soviet 100mm D-10, and a General Motors diesel replacing the original Soviet diesel engine. Find expert advice along with How To videos and articles, including instructions on how to make, cook, grow, or do almost anything. Wood's glass is a deep violet-blue barium-sodium silicate glass with about 9% nickel oxide developed during World War I to block visible light for covert communications. Many bottlers of spring water use UV disinfection equipment to sterilize their water. UV fluorescent dyes that glow in the primary colors are used in paints, papers, and textiles either to enhance color under daylight illumination or to provide special effects when lit with UV lamps. Even before the German chancellor's plane took off, the timing of this trip to China had become a topic for debate and criticism both inside and outside Germany. Radiation of this wavelength is almost absent from sunlight but is found in welder's arc lights and other artificial sources. Television, sometimes shortened to TV, is a telecommunication medium for transmitting moving images and sound.
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