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Inverted Bell
The inverted bell is a metaphorical name for geometric shape that resembles a bell upside-down. By context In architecture, the term is applied to describe the shape of the capitals of Corinthian columns. The inverted bell is used in shape classification in pottery,"Modern Fishing Lure Collectibles: Identification & Value Guide" (2002), {{ISBN, 1-57432-277-X often featured in archaeology as well as in modern times. The inverted bell curve is sometimes called well curve. Image:ZygmuntDzwon.JPG, A bell Image:Llyn Celyn spillway1 w.JPG, Bell-mouth spillway at Llyn Celyn image:GBM - Glockenbecher 1.jpg, Inverted-bell beaker from Atting during the Beaker culture. Gäubodenmuseum Straubing Image:Vorticella.JPG, Vorticella protozoa Image:Bell-krater hare BM F547.jpg , Bell krater A krater or crater ( grc-gre, , ''kratēr'', literally "mixing vessel") was a large two-handled shape of vase in Ancient Greek pottery and metalwork, mostly used for the mixing of wine with water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metaphor
A metaphor is a figure of speech that, for rhetorical effect, directly refers to one thing by mentioning another. It may provide (or obscure) clarity or identify hidden similarities between two different ideas. Metaphors are often compared with other types of figurative language, such as antithesis, hyperbole, metonymy, and simile. One of the most commonly cited examples of a metaphor in English literature comes from the " All the world's a stage" monologue from '' As You Like It'': All the world's a stage, And all the men and women merely players; They have their exits and their entrances And one man in his time plays many parts, His Acts being seven ages. At first, the infant... :—William Shakespeare, '' As You Like It'', 2/7 This quotation expresses a metaphor because the world is not literally a stage, and most humans are not literally actors and actresses playing roles. By asserting that the world is a stage, Shakespeare uses points of comparison between the worl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greco-Bactrian
The Bactrian Kingdom, known to historians as the Greco-Bactrian Kingdom or simply Greco-Bactria, was a Hellenistic-era Greek state, and along with the Indo-Greek Kingdom, the easternmost part of the Hellenistic world in Central Asia and the Indian Subcontinent from its founding in 256 BC by Diodotus I Soter to its fall BC under the reign of Heliocles I. It covered much of present-day Afghanistan, Uzbekistan, Tajikistan and Turkmenistan, and at its zenith, parts of Iran and Pakistan. An extension further east with military campaigns may have reached central Gansu province in China. Bactria was ruled by the Diodotid dynasty and rival Euthydemid dynasty. The capitals of Ai-Khanum and Bactra were among the largest and richest of antiquity - Bactria itself was known as the ‘''land of a thousand golden cities’''. The Indo-Greek Kingdoms, as Bactrian successor states, would last until 10 AD. History Independence and Diodotid dynasty Diodotus, the satrap of Bactria (and proba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krater
A krater or crater ( grc-gre, , ''kratēr'', literally "mixing vessel") was a large two-handled shape of vase in Ancient Greek pottery and metalwork, mostly used for the mixing of wine with water. Form and function At a Greek symposium, kraters were placed in the center of the room. They were quite large, so they were not easily portable when filled. Thus, the wine-water mixture would be withdrawn from the krater with other vessels, such as a ''kyathos'' (pl. ''kyathoi''), an ''amphora'' (pl. ''amphorai''), or a ''kylix'' (pl. ''kylikes''). In fact, Homer's ''Odyssey'' describes a steward drawing wine from a krater at a banquet and then running to and fro pouring the wine into guests' drinking cups. The modern Greek word now used for undiluted wine, ''krasi'' ( κρασί), originates from the ''krasis'' (''κράσις'', i.e., mixing) of wine and water in kraters. Pottery kraters were glazed on the interior to make the surface of the clay more impervious for holding wate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protozoa
Protozoa (singular: protozoan or protozoon; alternative plural: protozoans) are a group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic tissues and debris. Historically, protozoans were regarded as "one-celled animals", because they often possess animal-like behaviours, such as motility and predation, and lack a cell wall, as found in plants and many algae. When first introduced by Georg Goldfuss (originally spelled Goldfuß) in 1818, the taxon Protozoa was erected as a class within the Animalia, with the word 'protozoa' meaning "first animals". In later classification schemes it was elevated to a variety of higher ranks, including phylum, subkingdom and kingdom, and sometimes included within Protoctista or Protista. The approach of classifying Protozoa within the context of Animalia was widespread in the 19th and early 20th century, but not universal. By the 1970s, it became usual to require ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaker Culture
The Bell Beaker culture, also known as the Bell Beaker complex or Bell Beaker phenomenon, is an archaeological culture named after the inverted-bell beaker drinking vessel used at the very beginning of the European Bronze Age. Arising from around 2800 BC, it lasted in Britain until as late as 1800 BC but in continental Europe only until 2300 BC, when it was succeeded by the Unetice culture. The culture was widely dispersed throughout Western Europe, being present in many regions of Iberia and stretching eastward to the Danubian plains, and northward to the islands of Great Britain and Ireland, and was also present in the islands of Sicily and Sardinia and some small coastal areas in north-western Africa. The Bell Beaker phenomenon shows substantial regional variation, and a study from 2018 found that it was associated with genetically diverse populations. The Bell Beaker culture was partly preceded by and contemporaneous with the Corded Ware culture, and in north-cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaker (archaeology)
In archaeology, a beaker is a small round ceramic or metal drinking vessel shaped to be held in the hands. It has no handle or spout. Term Archaeologists identify several different types including the inverted-bell beaker, the butt beaker, the claw beaker, and the rough-cast beaker. When used alone “beaker” usually refers to the typical form of pottery cups called ''inverted-bell beakers'' associated with the European Beaker culture of the late Neolithic and early Bronze Age. Bell beakers The '' inverted-bell beaker'' or ''bell-beaker'' was first defined as a find-type by Lord Abercromby in the early twentieth century and comes in three distinct forms, the (typical) bell beaker, and the rarer short-necked beaker, and long-necked beaker. There are many variations on these basic types, with inter-grades between them. Bell-beakers have been found from North Africa to southern Scotland and from Portugal to the far east of Europe, but are particularly common in the Rhine va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Llyn Celyn
Llyn Celyn () is a reservoir constructed between 1960 and 1965 in the valley of the River Tryweryn in Gwynedd, Wales. It measures roughly long by wide, and has a maximum depth of . It has the capacity to hold of water. It was originally to be named ''Llyn Tryweryn Mawr'' (meaning "great Tryweryn lake"), but in September 1964 Liverpool Corporation agreed to the name change following a letter from the Tryweryn Defence Committee. Construction and opposition Construction of the reservoir for Liverpool Corporation Waterworks involved flooding the village of Capel Celyn and adjacent farmland, a deeply controversial move. Much of the opposition was brought about because the village was a stronghold of Welsh culture and the Welsh language, whilst the reservoir was being built to supply water to Liverpool and parts of the Wirral peninsula, rather than Wales. Liverpool Corporation's Tryweryn Reservoir Bill was presented in Parliament as a private bill in January 1957; by obtai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillway
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that water does not damage parts of the structure not designed to convey water. Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow—by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later. Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines. Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released. In contrast, an intake tower is a stru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Well Curve
A well is an excavation or structure created in the ground by digging, driving, or drilling to access liquid resources, usually water. The oldest and most common kind of well is a water well, to access groundwater in underground aquifers. The well water is drawn up by a pump, or using containers, such as buckets or large water bags that are raised mechanically or by hand. Water can also be injected back into the aquifer through the well. Wells were first constructed at least eight thousand years ago and historically vary in construction from a simple scoop in the sediment of a dry watercourse to the qanats of Iran, and the stepwells and sakiehs of India. Placing a lining in the well shaft helps create stability, and linings of wood or wickerwork date back at least as far as the Iron Age. Wells have traditionally been sunk by hand digging, as is still the case in rural areas of the developing world. These wells are inexpensive and low-tech as they use mostly manual labour, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geometric Shape
A shape or figure is a graphical representation of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture, or material type. A plane shape or plane figure is constrained to lie on a '' plane'', in contrast to ''solid'' 3D shapes. A two-dimensional shape or two-dimensional figure (also: 2D shape or 2D figure) may lie on a more general curved '' surface'' (a non-Euclidean two-dimensional space). Classification of simple shapes Some simple shapes can be put into broad categories. For instance, polygons are classified according to their number of edges as triangles, quadrilaterals, pentagons, etc. Each of these is divided into smaller categories; triangles can be equilateral, isosceles, obtuse, acute, scalene, etc. while quadrilaterals can be rectangles, rhombi, trapezoids, squares, etc. Other common shapes are points, lines, planes, and conic sections such as ellipses, circles, and parabolas. Among t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaussian Function
In mathematics, a Gaussian function, often simply referred to as a Gaussian, is a function of the base form f(x) = \exp (-x^2) and with parametric extension f(x) = a \exp\left( -\frac \right) for arbitrary real constants , and non-zero . It is named after the mathematician Carl Friedrich Gauss. The graph of a Gaussian is a characteristic symmetric " bell curve" shape. The parameter is the height of the curve's peak, is the position of the center of the peak, and (the standard deviation, sometimes called the Gaussian RMS width) controls the width of the "bell". Gaussian functions are often used to represent the probability density function of a normally distributed random variable with expected value and variance . In this case, the Gaussian is of the form g(x) = \frac \exp\left( -\frac \frac \right). Gaussian functions are widely used in statistics to describe the normal distributions, in signal processing to define Gaussian filters, in image processing where two-dimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
