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Die-deterioration Doubling
{{numismatics Die deterioration doubling (DDD) is a common form of mint-made error on many United States and Canadian coins that results from degradation of the die used to strike the coin. Due to a combination of improper preparation and treatment of the dies, excessive wear, and overuse, die deterioration doubling has occurred on nearly every series issued by the US mint in recent times. Certain coins are more susceptible to it than others, due to various factors, but it does occur on most series of coins. Causes Annealing Errors During the annealing process of die making, two main errors can occur, resulting in less than perfect dies. It is impossible to tell without expensive and lengthy tests whether these errors occurred, but they will lead to significantly weaker dies and a higher tendency to deteriorate quickly. The first thing which can happen to a die in this process what metallurgists call decarburization. Decarburization is the result of an improper mix of metals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DDD Closeup
DDD or Triple D may refer to: Science and medicine *Defined daily dose, a World Health Organization statistical measure of drug use *Degenerative disc disease, a common disorder of the lower spine *Dense deposit disease, the preferred name for Membranoproliferative glomerulonephritis Type II *Dichlorodiphenyldichloroethane, a breakdown product of DDT *Dual pacing, dual sensing and dual response Artificial cardiac pacemaker#mode, modes of a pacemaker Computers and technology *Data Display Debugger or GNU DDD, a popular graphical user interface for command-line debuggers *Digital Divide Data, a social enterprise providing disadvantaged youths in Cambodia, Laos and Kenya with IT education and training *Direct distance dialing, a method for telephone subscribers to call long-distance numbers without operator assistance *DDD, the SPARS code for a CD that was recorded, mixed, and mastered digitally *Domain-driven design, a methodology and set of priorities for programming *Developer! De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver
Silver is a chemical element with the Symbol (chemistry), symbol Ag (from the Latin ', derived from the Proto-Indo-European wikt:Reconstruction:Proto-Indo-European/h₂erǵ-, ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc Refining (metallurgy), refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes bimetallism, alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outside Abraded Die Doubling
Outside or Outsides may refer to: General * Wilderness * Outside (Alaska), any non-Alaska location, as referred to by Alaskans Books and magazines * ''Outside'', a book by Marguerite Duras * ''Outside'' (magazine), an outdoors magazine Film, theatre and TV * ''Outside'' (film), a 2004 short film by Jenn Kao * ''Outside'' (2002 film), a 2002 film produced by Chris Bender * "Outside", an episode of ''One Day at a Time'' (2017 TV series) Music * Outside (jazz), an element of musical composition/improvisation * Outside Music, a Canadian music distributor and record label * Outside Studios, a British recording studio, based in England Albums * ''Outside'' (Amar album), 2000 * ''Outside'' (David Bowie album), 1995 * ''Outside'' (Burna Boy album), 2018 * ''Outside'' (CFCF album), 2013 * ''Outside'' (Shelly Manne album), 1970 * ''Outside'' (O'Death album), 2011 * ''Outside'' (Tapes n' Tapes album), 2011 * ''Outsides'' (EP), by John Frusciante, 2013 * ''Outsides'', an albu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cent (currency)
The cent is a monetary unit of many national currencies that equals of the basic monetary unit. Etymologically, the word 'cent' derives from the Latin word meaning hundred. The cent sign is commonly a simple minuscule (lower case) letter . In North America, the c is crossed by a diagonal stroke or a vertical line (depending on typeface), yielding the character . The United States one cent coin is generally known by the nickname " penny", alluding to the British coin and unit of that name. Australia ended production of their 1¢ coin in 1992, as did Canada in 2012. Some Eurozone countries ended production of the 1 euro cent coin, most recently Italy in 2018. Symbol The cent may be represented by the cent sign, written in various ways according to the national convention and font choice. Most commonly seen forms are a minuscule letter ''c'' crossed by a diagonal stroke or a vertical line or by a simple ''c'', depending on the currency (''see below''). Cent amounts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nickel
Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive but large pieces are slow to react with air under standard conditions because a passivation layer of nickel oxide forms on the surface that prevents further corrosion. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's outer and inner cores. Use of nickel (as natural meteoric nickel–iron alloy) has been traced as far back as 3500 BCE. Nickel was first isolated and classified as an e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Face Value
The face value, sometimes called nominal value, is the value of a coin, bond, stamp or paper money as printed on the coin, stamp or bill itself by the issuing authority. The face value of coins, stamps, or bill is usually its legal value. However, their market value need not bear any relationship to the face value. For example, some rare coins or stamps may be traded at prices considerably above their face value. Coins may also have a salvage value due to more or less valuable metals that they contain. Overview The face value of bonds usually represents the principal or redemption value. Interest payments are expressed as a percentage of face value. Before maturity, the actual value of a bond may be greater or less than face value, depending on the interest rate payable and the perceived risk of default. As bonds approach maturity, actual value approaches face value. In the case of stock certificates, face value is the par value of the stock. In the case of common stock, p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numismatics
Numismatics is the study or collection of currency, including coins, tokens, paper money, medals and related objects. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods. The earliest forms of money used by people are categorised by collectors as "Odd and Curious", but the use of other goods in barter exchange is excluded, even where used as a circulating currency (e.g., cigarettes or instant noodles in prison). As an example, the Kyrgyz people used horses as the principal currency unit, and gave small change in lambskins; the lambskins may be suitable for numismatic study, but the horses are not. Many objects have been used for centuries, such as cowry shells, precious metals, cocoa beans, large stones, and gems. Etymology First attested in English 1829, the word ''numismatics'' comes from the adjective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serif
In typography, a serif () is a small line or stroke regularly attached to the end of a larger stroke in a letter or symbol within a particular font or family of fonts. A typeface or "font family" making use of serifs is called a serif typeface (or serifed typeface), and a typeface that does not include them is sans-serif. Some typography sources refer to sans-serif typefaces as "grotesque" (in German, ) or "Gothic", and serif typefaces as "roman". Origins and etymology Serifs originated from the first official Greek writings on stone and in Latin alphabet with inscriptional lettering—words carved into stone in Roman antiquity. The explanation proposed by Father Edward Catich in his 1968 book ''The Origin of the Serif'' is now broadly but not universally accepted: the Roman letter outlines were first painted onto stone, and the stone carvers followed the brush marks, which flared at stroke ends and corners, creating serifs. Another theory is that serifs were devised to neate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnification
Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called ''minification'' or ''de-magnification''. Typically, magnification is related to scaling up visuals or images to be able to see more detail, increasing resolution, using microscope, printing techniques, or digital processing. In all cases, the magnification of the image does not change the perspective of the image. Examples of magnification Some optical instruments provide visual aid by magnifying small or distant subjects. * A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye. * A telescope, which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image clo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal
A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile (can be drawn into wires) and malleable (they can be hammered into thin sheets). These properties are the result of the ''metallic bond'' between the atoms or molecules of the metal. A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polymeric sulfur nitride. In physics, a metal is generally regarded as any substance capable of conducting electricity at a temperature of absolute zero. Many elements and compounds that are not normally classified as metals become metallic under high pressures. For example, the nonmetal iodine gradually becomes a metal at a pressure of between 40 and 170 thousand times atmospheric pressure. Equally, some materials regarded as metals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bust (sculpture)
A bust is a sculpted or cast representation of the upper part of the human figure, depicting a person's head and neck, and a variable portion of the chest and shoulders. The piece is normally supported by a plinth. The bust is generally a portrait intended to record the appearance of an individual, but may sometimes represent a type. They may be of any medium used for sculpture, such as marble, bronze, terracotta, plaster, wax or wood. As a format that allows the most distinctive characteristics of an individual to be depicted with much less work, and therefore expense, and occupying far less space than a full-length statue, the bust has been since ancient times a popular style of life-size portrait sculpture. It can also be executed in weaker materials, such as terracotta. A sculpture that only includes the head, perhaps with the neck, is more strictly called a "head", but this distinction is not always observed. Display often involves an integral or separate display stan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hub Doubling
A hub is the central part of a wheel that connects the axle to the wheel itself. Hub, The Hub, or hubs may refer to: Geography Pakistan * Hub Tehsil, Balochistan, an administrative division ** Hub, Balochistan, capital city of the tehsil * Hub Dam, in Balochistan * Hub River, in Balochistan United States * Hub, California, an unincorporated community * Hub, Mississippi, an unincorporated community Elsewhere * Hub Nunatak, Graham Land, Antarctica Buildings in the United States * HUB Tower, Des Moines, Iowa * Hub (Minneapolis, Minnesota), a residential apartment building in Minneapolis * Hub Building, Burwell, Nebraska, on the National Register of Historic Places Organizations * Harvard University Band * Hogeschool-Universiteit Brussel, Belgium * Hub International, a North American insurer * Hub Power Company, first and largest Pakistani Independent Power Producer Transport * Airline hub * Transport hub Codes * HUB, Guobiao abbreviation of Hubei, a province of China * HU ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
