bismuth

The aboriginal nations of New Brunswick include the Mi'kmaq (Micmac), Maliseet and Passamaquoddy. The Mi'kmaq territories were mostly in the east of the province. The Maliseets were located in the northwest and the Passamaquoddy tribe was situated in the southwest, around Passamaquoddy Bay. Until the 16th century, New Brunswick was exclusively the domain of what are now termed the First Nations. New Brun ...

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New Brunswick, New Brunswick - Geography, New Brunswick - History, New Brunswick - Early European settlement, New Brunswick - A British colony, New Brunswick - New Brunswick in Canada, New Brunswick - Cities, New Brunswick - Economy, New Brunswick - Education, New Brunswick - People, New Brunswick - Media Outlets, New Brunswick - Demographics, New Brunswick - Facts, New Brunswick - Map, New Brunswick - Literature

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Despite many efforts a definitive reaction mechanism for the Fries rearrangement is not available. Evidence for inter- and intramolecular mechanisms have been obtained by so-called cross-experiments with mixed reactants. Reaction progress is not dependent on solvent or substrate. A widely accepted mechanism involves a carbocation intermediate. In the first reaction step a lewis acid for instance aluminium chloride AlCl3 attacks the carbonyl oxygen atom of the acyl group. This oxygen atom is more electron deficient than the ...

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Fries rearrangement, Fries rearrangement - Mechanism, Fries rearrangement - Scope, Fries rearrangement - Limits, Fries rearrangement - Photo Fries rearrangement

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Nuclear power - Current Technology. There are two types of nuclear power sources in current use: The nuclear fission reactor produces heat through a controlled nuclear chain reaction in a critical mass of fissile material. All current nuclear power plants are critical fission reactors, which are the focus of this article. The output of fission reactors is controllable. There are several subtypes of critical fission reactors. All reactors will be compared to the Pressurized Water Reactor (PWR ...

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Nuclear power, Nuclear power - History, Nuclear power - Origins, Nuclear power - Early years, Nuclear power - Development, Nuclear power - Current and planned use, Nuclear power - Reactor Types, Nuclear power - Current Technology, Nuclear power - Experimental Technologies, Nuclear power - Life cycle, Nuclear power - Fuel resources, Nuclear power - Reprocessing, Nuclear power - Solid waste, Nuclear power - Economy, Nuclear power - Capital costs, Nuclear power - Operating costs, Nuclear power - Subsidies, Nuclear power - Other economic issues, Nuclear power - Risks, Nuclear power - Accident or attack, Nuclear power - Air pollution, Nuclear power - Waste heat in water systems, Nuclear power - Health effect on population near nuclear plants, Nuclear power - Nuclear proliferation, Nuclear power - List of atomic energy groups

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Kyrgyzstan has been spared many of the enormous environmental problems faced by its Central Asian neighbors, primarily because its designated roles in the Soviet system involved neither heavy industry nor large-scale cotton production. Also, the economic downturn of the early 1990s reduced some of the more serious effects of industrial and agricultural policy. Nevertheless, Kyrgyzstan has serious problems because of inefficient use and pollution of water resources, land degradation, and improper agricultural practices. Natural hazar ...

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Geography of Kyrgyzstan, Geography of Kyrgyzstan - Topography and drainage, Geography of Kyrgyzstan - Climate, Geography of Kyrgyzstan - Environmental problems, Geography of Kyrgyzstan - Water resources, Geography of Kyrgyzstan - Land management, Geography of Kyrgyzstan - The Aral Sea, Geography of Kyrgyzstan - Environmental policy making, Geography of Kyrgyzstan - Area and boundaries, Geography of Kyrgyzstan - Resources and land use, Geography of Kyrgyzstan - Sources

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Phosphors are usually made from a suitable host material, to which an activator is added. The best known type is a copper-activated zinc sulfide and the silver-activated zinc sulfide (zinc sulfide silver). The host materials are typically oxides, sulfides, selenides, halides or silicates of zinc, cadmium, manganese, aluminum, silicon, or various rare earth metals. The activators prolong the emission time (afterglow). In turn, other materials (eg. nickel) can be used to quench the afterglow and shorten the decay part of ...

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Phosphor, Phosphor - Materials, Phosphor - Glow in the dark toys, Phosphor - Radoactive light sources, Phosphor - Electroluminescence, Phosphor - White LEDs, Phosphor - Cathode ray tubes, Phosphor - Fluorescent lamps, Phosphor - Detergents, Phosphor - Various

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Eighty-three is the sum of three consecutive primes (23 + 29 + 31) as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23). It is also the 23rd prime number, following 79 and preceding 89. 83 is a Sophie Germain prime and a safe prime, and also a Chen prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.< ...

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83 number, 83 number - In mathematics, 83 number - In astronomy, 83 number - In other fields

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Selenium is an essential micronutrient in all known forms of life; it is a component of the unusual amino acid selenocysteine. Because of its photovoltaic and photoconductive properties, selenium is used extensively in electronics, such as photo cells and solar cells. Selenium is also extensively used in rectifiers. Selenium is used to remove color from glass, as it will counteract the green color that ferrous impurities impart. It also can be used to give a red color to glasses and enamels. Selenium is used to improve the abrasion resistance in vulcanized rubbers. I ...

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Selenium, Selenium - Applications, Selenium - History, Selenium - Occurrence, Selenium - Isotopes, Selenium - Precautions, Selenium - Selenium and health, Selenium - In popular culture, Selenium - Compounds

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There are technical difficulties to overcome before ADS can become economical and eventually be integrated into a future nuclear waste management. The accelerator must provide a high intensity and be highly reliable. There are concerns about the window separating the protons from the spallation target, which is expected to be exposed to stress under extreme conditions. The chemical separation of the transuranic elements and the fuel manufacturing, as well as the structure materials, are important issues. Finally, the lack of nuclear data a ...

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Subcritical reactor, Subcritical reactor - Motivation, Subcritical reactor - Principle, Subcritical reactor - Technical challenges, Subcritical reactor - Economics and public acceptance

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The heaviest of the alkaline earth metals, radium is intensely radioactive and resembles Barium chemically. This metal is found (combined) in minute quantities in the uranium ore pitchblende, and various other uranium minerals. Radium preparations are remarkable for maintaining themselves at a higher temperature than their surroundings, and for their radiations, which are of three kinds: alpha rays, beta rays, and gamma rays. Radium ...

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Radium, Radium - Notable characteristics, Radium - Applications, Radium - History, Radium - Occurrence, Radium - Compounds, Radium - Isotopes, Radium - Radioactivity, Radium - Precautions

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The most common use of radiography is in the medical field (where it is known as medical imaging), but veterinarians and engineers also use it. Radiography - Medicine. X-rays are the second most commonly used medical tests, after blood tests. Bone and some organs (such as lungs) especially lend themselves to X-ray imaging. It is a relatively low-cost investigation with a high diagnostic yield, although CT scans or other more specialised technologies may be necessary to delineate diseases. Ultrasound, by comparison, ...

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Radiography, Radiography - Uses, Radiography - Medicine, Radiography - Airport security, Radiography - Industrial radiography, Radiography - Theory

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Quern-stones have been used throughout the world to grind materials, the most important of which was usually grain to make flour for bread-making. They were generally replaced by millstones once mechanised forms of milling appeared, particularly the water mill and the windmill, although animals were also used to operate the millstones. However, in many non-Westernised, non-mechanised cultures they are still manufactured and used regulary and have only been replaced i ...

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Quern-stone, Quern-stone - Uses of quern-stones, Quern-stone - Manufacture of quern-stones, Quern-stone - Types of quern-stones, Quern-stone - Bibliography

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Here is a list of some of salicylic acid's properties when acting as a plant hormone. It is interesting to note, in light of these properties, that there is a popular belief that cut flowers will last longer if aspirin (acetylsalicylic acid) is dissolved in their water. Salicylic acid - Location characteristics and occasions for synthesis induction. Cells returning from water stress Released by cells secure in having more than enough nutrients and environmental conditions locally to survive ...

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Salicylic acid, Salicylic acid - Properties, Salicylic acid - Medicinal uses, Salicylic acid - Salicylic acid as a plant hormone, Salicylic acid - Location characteristics and occasions for synthesis induction, Salicylic acid - Effects

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There's antimony, arsenic, aluminum, selenium, And hydrogen and oxygen and nitrogen and rhenium, And nickel, neodymium, neptunium, germanium, And iron, americium, ruthenium, uranium, Europium, zirconium, lutetium, vanadium, And lanthanum and osmium and astatine and radium, And gold and protactinium and indium and gallium, And iodine and thorium and thulium and thallium. There's yttrium, ytterbium, actinium, rubidium, And boron, gadolinium, niobium, iridium, And strontium and silicon and silver and samarium, And bismuth, bromine, l ...

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The Elements song, The Elements song - Lyrics, The Elements song - Periodic Table according to Lehrer

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Tin bonds readily to iron, and has been used for coating lead or zinc and steel to prevent corrosion. Tin-plated steel containers are widely used for food preservation, and this forms a large part of the market for metallic tin. British English calls them "tins"; Americans call them "cans". One thus-derived use of the slang term "tinnie" or "tinny" means "can of beer". Other uses: Some important tin alloys are: bronze, bell metal, Babbitt metal, die casting alloy, pewter, phosphor bronze, soft solder, and White metal.See also:

Tin, Tin - Notable characteristics, Tin - Allotropes, Tin - Applications, Tin - History, Tin - Occurrence, Tin - Isotopes, Tin - Compounds, Tin - Precautions

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The aboriginal nations of New Brunswick include the Mi'kmaq (Micmac), Maliseet and Passamaquoddy. The Mi'kmaq territories are mostly in the east of the province. The Maliseets are located in the northwest and the Passamaquoddy tribe is situated in the southwest, around Passamaquoddy Bay. Until the 16th century, New Brunswick was exclusively the domain of what are now termed the First Nations. New Brun ...

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New Brunswick, New Brunswick - Geography, New Brunswick - History, New Brunswick - Early European settlement, New Brunswick - A British colony, New Brunswick - New Brunswick in Canada, New Brunswick - Cities, New Brunswick - Politics, New Brunswick - Economy, New Brunswick - Education, New Brunswick - People, New Brunswick - Media Outlets, New Brunswick - Demographics, New Brunswick - Facts, New Brunswick - Map, New Brunswick - Literature

Read more here: » New Brunswick: Encyclopedia II - New Brunswick - History

This highly radioactive element has been confirmed by mass spectrometers to behave chemically much like other halogens, especially iodine (it probably accumulates in the thyroid gland like iodine). Astatine is thought to be more metallic than iodine. Researchers at the Brookhaven National Laboratory have performed experiments that have identified and measured elementary reactions that involve astatine. With the possible exception of francium, astatine is the rarest naturally occurring element with the total amount in Earth's crust est ...

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Astatine, Astatine - Notable characteristics, Astatine - History, Astatine - Occurrence, Astatine - Isotopes

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It was first created at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it were observed (all 272Rg), by the fusion of bismuth-209 and nickel-64 in a linear accelerator. (Nickel was bombarded onto the bismuth target.) The name roentgenium was accepted as a permanent name on November 1, 2004 in honour of Wilhelm Roentgen; before this date, the element was known under the temporary IUPAC systematic element name unununium. Some res ...

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Roentgenium, Roentgenium - History, Roentgenium - Isotopes

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Radon is a carcinogenic gas. Radon is a radioactive material and must be handled with care at all times. It is hazardous to inhale this element since it emits alpha particles. Also, its solid decay products, and their respective products, tend to form a fine dust which can easily enter the airways and become permanently stuck in lung tissue, producing heavy localized exposure. Rooms where radium, actinium, or thorium are stored should be well-ventilated in order to prevent build-up in the air. The build-up of radon is a potential heal ...

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Radon, Radon - Notable characteristics, Radon - Applications, Radon - History, Radon - Occurrence, Radon - Compounds, Radon - Isotopes, Radon - Precautions, Radon - Radon therapy

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The study group was formed as part of the venereal disease section of the U.S. Public Health Service (PHS). The start of the Tuskegee Syphilis Study is most commonly attributed to Dr. Taliaferro Clark. His initial aim was to follow untreated syphilis in a group of black men for only 6-8 months and then follow up with a treatment phase. Nevertheless Dr. Clark agreed with the deceptive practices suggested by other study members. Clark retired the year after the beginning of the study. Dr. Eugene Dibble was ...

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Tuskegee Syphilis Study, Tuskegee Syphilis Study - Study clinicians, Tuskegee Syphilis Study - Study details, Tuskegee Syphilis Study - Study termination and aftermath, Tuskegee Syphilis Study - Ethical implications, Tuskegee Syphilis Study - Dramatizations

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Water molecule - Density of water and ice. For most substances, the solid form of the substance is more dense than the liquid form; thus, a block of pure solid substance will sink in a tub of pure liquid substance. But, by contrast, a block of common ice will float in a tub of water because solid water is less dense than liquid water. This is an extremely important characteristic property of water. At room temperature, liquid water becomes denser with lowering temperature, just like ot ...

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Water molecule, Water molecule - Forms of water, Water molecule - A common substance, Water molecule - Water in the Universe, Water molecule - Water on Earth, Water molecule - Water in industry, Water molecule - Physics and chemistry of water, Water molecule - Density of water and ice, Water molecule - Density of saltwater and ice, Water molecule - Triple point, Water molecule - Mpemba effect, Water molecule - Hot ice, Water molecule - Surface tension, Water molecule - Electrical properties, Water molecule - Dipolar nature of water, Water molecule - Water as a solvent, Water molecule - Amphoteric nature of water, Water molecule - Acidity in nature, Water molecule - Hydrogen bonding in water, Water molecule - Quantum properties of Molecular Water, Water molecule - History, Water molecule - Systematic nomenclature and humor

Read more here: » Water molecule: Encyclopedia II - Water molecule - Physics and chemistry of water

Wedding ring - Pre-wedding customs. According to some customs, the wedding ring forms the last in a series of gifts, which also may include the engagement ring, traditionally given as a betrothal present, and the promise ring, often given when serious courting begins. Other more recent traditions, and the jewelry trade, seek to expand the idea of a series of ring-gifts with an eternity ring, which symbolizes the renewal or ongoing nature of a lasting marriage, sometimes given after the birth of a first chi ...

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Wedding ring, Wedding ring - Traditional customs, Wedding ring - Pre-wedding customs, Wedding ring - Wedding ceremony customs, Wedding ring - Post-wedding customs, Wedding ring - Contemporary usage, Wedding ring - Materials, Wedding ring - Styles patterns fashions, Wedding ring - Quotes

Read more here: » Wedding ring: Encyclopedia II - Wedding ring - Traditional customs