Question: What is the source of origin of this object?

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Swastika. The swastika (卐 or 卍) is an ancient religious and cultural symbol, predominantly in various Eurasian, as well as some African and American cultures, now also widely recognized for its appropriation by the Nazi Party and by neo-Nazis. It continues to be used as a symbol of divinity and spirituality in Indian religions, including Hinduism, Buddhism, and Jainism. It generally takes the form of a cross, the arms of which are of equal length and perpendicular to the adjacent arms, each bent midway at a right angle.The word "swastika" comes from , meaning "conducive to well-being". In Hinduism, the right-facing.

Swastika. Textile number T.231-1923 held at the V&A Museum in London includes small swastikas in its design. This piece was found at Qau-el-Kebir, near Asyut, and is dated between 300 and 600 CE.The "Tierwirbel" (the German for "animal whorl" or "whirl of animals") is a characteristic motif in Bronze Age Central Asia, the Eurasian Steppe, and later also in Iron Age Scythian and European (Baltic and Germanic) culture, showing rotational symmetric arrangement of an animal motif, often four birds' heads. Even wider diffusion of this "Asiatic" theme has been proposed, to the Pacific and even North America (especially Moundville).## Historical use.In.

Swastika. used on coinage as a backdrop to the .## Non-Eurasian samples.## Africa.Swastikas can be seen in various African cultures. In Ethiopia the Swastika is carved in the window of the famous 12th-century Biete Maryam, one of the Rock-Hewn Churches, Lalibela. In Ghana, the swastika is among the adinkra symbols of the Akan peoples. Called "nkontim", swastikas could be found on Ashanti gold weights and clothing.## Americas.The swastika is a Navajo symbol for good luck, also translated to "whirling log". Though it was also used by some Native American groups, many object to its use today. The symbol was used on.

Swastika. German Nazi party and would soon become the foremost symbol of the German Reich. The fact that these gates survived the cleanup after the German occupation of Norway during WW II is a testimony to the innocence and good faith of the power plant and its architects. The architects Bjercke and Eliassen knew the swastika as a symbol of power plants on maps in Scandinavia, and as the logo of Allmänna Svenska Elektriska Aktiebolaget, ASEA.## Eurasia (Russia).The left-handed swastika was a favorite sign of the last Russian Empress Alexandra Feodorovna. She wore a talisman in the form of a swastika,.


Question: What is the length of the incubation period (in day) of this bird's egg?

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Great kiskadee. Tobago in about 1970.## Taxonomy.The great kiskadee was described and illustrated in 1648 by the German naturalist Georg Marcgrave in the "Historia Naturalis Brasiliae". He used the name , the word for a large flycatcher in the Tupi language. In 1760 the French zoologist Mathurin Jacques Brisson included a description of the species in his "Ornithologie" based on a specimen collected in Cayenne, French Guiana. He used the French name and the Latin name . Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. At.

Great kiskadee. The nest is placed in a wide range of sites, often in an exposed position high up in a tree or on man-made structures. Occasionally the nest is placed in a cavity. The clutch is 3 to 4 eggs. These are moderately glossy, light yellowish cream in colour with purplish black and purplish brown spots. The average size is 27.9 x 20.0 (mm). Only the female incubates the eggs; the male guards the nest while she leaves the nest to feed. The eggs hatch after 16–17 days. The chicks are fed by both parents and fledge after 17–18 days.## Food.


Question: Which place is this plant endemic to?

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Schizachyrium scoparium. Schizachyrium scoparium, commonly known as little bluestem or beard grass, is a species of North American prairie grass native to most of the contiguous United States (except California, Nevada, and Oregon) as well as a small area north of the Canada–US border and northern Mexico. It is most common in the Midwestern prairies and is one of the most abundant native plants in Texas grasslands.Little bluestem is a perennial bunchgrass and is prominent in tallgrass prairie, along with big bluestem ("Andropogon gerardi"), indiangrass ("Sorghastrum nutans") and switchgrass ("Panicum virgatum"). It is a warm-season species, meaning it employs the C4 photosynthetic.

Schizachyrium scoparium. pathway.## Description.Little bluestem grows to become an upright, roundish mound of soft, bluish-green or grayish-green blades in May and June that is about two to three feet high. In July, it initiates flowering stalks, which reach four to five feet in height. In fall, it displays a coppery or mostly orange color with tints of red or purple. Sometimes it displays in some places, as in sandy soils, a redder fall color. It becomes a more orangish-bronze in winter until early spring, when it becomes more tan.## Cultivation.It is recommended for USDA zones 3 to 10.The plant grows best in.

Schizachyrium scoparium. full sun and on well-drained soils. It can be dug up and divided in spring, as many other perennials, for propagation or to reduce the size of an old, big plant. It can be burned in late winter or early spring in a prairie or meadow before new growth, like many American prairie grasses (big bluestem, Indian-grass, and switchgrass), which burn quickly and cleanly.## Cultivars.A number of cultivars have been developed. 'Carousel' is a compact form with especially good fall color developed by Chicagoland Grows. 'The Blues' is a selection that has bluer foliage. 'Standing Ovation' is a tight, upright.

Schizachyrium scoparium. form with bluer and thicker blades and sturdier stems.## Subdivisions.One variety, var. "littorale", is native to the eastern and southern coastal strip of the United States, as well as the shores of the Great Lakes. It is adapted to sand dune habitat, and is sometimes considered a separate species, "S. littorale".## Culture.Little bluestem is the official state grass of Nebraska and Kansas.## Ecology.Little bluestem is drought tolerant, and is a larval host to the cobweb skipper, common wood nymph, crossline skipper, Dakota skipper, dusted skipper, Indian skipper, Leonard's skipper, Ottoe skipper, and swarthy skipper.Missouri Botanical Garden's Kemper Center for Home.


Question: Who is the creator of this building?

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Jeanne d'Arc (Frémiet). Jeanne d'Arc is an 1874 French gilded bronze equestrian sculpture of Joan of Arc by Emmanuel Frémiet. The outdoor statue is prominently displayed in the Place des Pyramides in Paris. == History == The original statue was commissioned by the French government after the defeat of the country in the 1870 Franco-Prussian War. It is the only public commission of the state from 1870 to 1914, called the Golden Age of statuary in Paris, the other statues were funded by private subscriptions. The sculptor took as his model Aimée Girod (1856–1937), a young woman from Domrémy, Joan of Arc's village.


Question: What is the closest parent taxonomy of this plant?

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Olive. The olive, botanical name Olea europaea, meaning 'European olive' in Latin, is a species of small tree or shrub in the family Oleaceae, found traditionally in the Mediterranean Basin. When in shrub form, it is known as "Olea europaea" 'Montra', dwarf olive, or little olive. The species is cultivated in all the countries of the Mediterranean, as well as in Australia, New Zealand, North and South America and South Africa. "Olea europaea" is the type species for the genus "Olea".The olive's fruit, also called an "olive", is of major agricultural importance in the Mediterranean region as the source of olive.

Olive. ("eleiva") from the archaic Proto-Greek form *ἐλαίϝα (*"elaíwa") (Classic Greek ', "olive fruit", "olive tree"). The word "oil" originally meant "olive oil", from ', (', "olive oil"). Also in multiple other languages the word for "oil" ultimately derives from the name of this tree and its fruit. The oldest attested forms of the Greek words are the Mycenaean , ', and , ' or , "", written in the Linear B syllabic script.## Description.The olive tree, "Olea europaea", is an evergreen tree or shrub native to Mediterranean Europe, Asia, and Africa. It is short and squat and rarely exceeds 8.

Olive. when ripe, thinner-fleshed and smaller in wild plants than in orchard cultivars. Olives are harvested in the green to purple stage. Canned black olives have often been artificially blackened (see below on processing) and may contain the chemical ferrous gluconate to improve the appearance. "Olea europaea" contains a pyrena commonly referred to in American English as a "pit", and in British English as a "stone".## Taxonomy.The six natural subspecies of "Olea europaea" are distributed over a wide range:"Olea europaea" subsp. "europaea" (Mediterranean Basin)"Olea europaea" var. "sylvestris", considered the "wild" olive of the Mediterranean, is a variety characterized by a smaller.

Olive. tree bearing noticeably smaller fruit."O. e." subsp. "cuspidata" (from South Africa throughout East Africa, Arabia to Southwest China)"O. e. "subsp. "cerasiformis" (Madeira); also known as "Olea maderensis""O. e. "subsp. "guanchica" (Canary Islands)"O. e. "subsp. "laperrinei" (Algeria, Sudan, Niger)"O. e. "subsp. "maroccana" (Morocco)The subspecies "O. e. cerasiformis" is tetraploid, and "O. e. maroccana" is hexaploid. Wild-growing forms of the olive are sometimes treated as the species "Olea oleaster". The trees referred to as "white" and "black" olives in Southeast Asia are not actually olives but species of "Canarium".## Cultivars.Hundreds of cultivars of the olive tree are known. An olive's cultivar has.

Olive. possibly much older. Visiting guides to the garden often state that they are two thousand years old." The 2,000-year-old Bidni olive trees on Malta, which have been confirmed through carbon dating, have been protected since 1933 and are listed in UNESCO's Database of National Cultural Heritage Laws. In 2011, after recognising their historical and landscape value, and in recognition of the fact that "only 20 trees remain from 40 at the beginning of the 20th century", Maltese authorities declared the ancient Bidni olive grove at Bidnija as a Tree Protected Area.## Uses.The olive tree, "Olea europaea", has been cultivated for.

Olive. presentation, with plain olives having higher contents than those that are pitted or stuffed.## Allergenic potential.Olive tree pollen is extremely allergenic, with an OPALS allergy scale rating of 10 out of 10. "Olea europaea" is primarily wind-pollinated and its light, buoyant pollen is a strong trigger for asthma. One popular variety, "Swan Hill", is widely sold as an "allergy-free" olive tree; however, this variety does bloom and produce allergenic pollen. Moria (tree) List of olive cultivars Olive skin Agricultural Research Service, US Department of Agriculture; Germplasm Resources Information Network (GRIN): "Olea europaea" Most Common Spanish Olea Trees, Ginart Oleas.


Question: What is the closest parent taxonomy of this plant?

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Tephrosia virginiana. Tephrosia virginiana, also known as goat-rue, goat's rue, catgut, rabbit pea, and Virginia tephrosia, is a perennial dicot in family Fabaceae. This subshrub has alternate compound leaves. Its leaves are imparipinnate, with relatively wide pinnae. All parts of the plant are pubescent giving it a silvery, hoary appearance. The terminal, compact racemes of cream and deep pink flowers bloom May to August. This plant prefers acidic soils, in part to full sun. It grows throughout the Midwest, New England and southeastern United States. Not easy to propagate, this plant can be found in sand savannas, open woods and glades, prairies.

Tephrosia virginiana. and rocky soils.All tissues of this plant are toxic (containing galegine), and should not be eaten by people or livestock. Crushed stems were previously used as a fish poison.Peterson, Lee. (1977) A Field Guide to Edible Wild Plants of Eastern and Central North America. Houghton Mifflin Company, Boston. p. 82. USDA Plants Profile for "Tephrosia virginiana" (Virginia tephrosia).


Question: What is the spore print color of this plant?

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Clitocybe nuda. Cooke called it the amethyst lepista, John Sibthorp called it the blue-gilled agaric in his 1794 work "Flora Oxoniensis".## Description.This mushroom can range from lilac to purple-pink. Some North American specimens are duller and tend toward tan, but usually have purplish tones on the stem and gills. Younger specimens are lighter with more convex caps, while mature specimens have a darker color and flatter cap, ranging from in diameter. The gills are attached to the short, stout stem, which is about long and 1–2.5 cm wide, sometimes larger at the base. Wood blewits have a very distinctive odor, which has.

Clitocybe nuda. been likened by one author to that of frozen orange juice.Wood blewits can be easily distinguished by their odor, as well as by their spore print, which is white to pale pink.## Similar species.Wood blewits can be confused with certain blue or purple species of the genus "Cortinarius", including the uncommon "C. camphoratus", many of which may be poisonous. "Cortinarius" mushrooms often have the remains of a veil under their caps and a ring-like impression on their stem. "Cortinarius" species produce a rusty brown spore print after several hours on white paper. Their brown spores often dust their stems and.


Question: Which company manufactures this item?

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Basket. and broad-leaved tropical bromeliads each require a different method of twisting and braiding to be made into a basket. The practice of basket making has evolved into an art. Artistic freedom allows basket makers a wide choice of colors, materials, sizes, patterns, and details.The carrying of a basket on the head, particularly by rural women, has long been practiced. Representations of this in Ancient Greek art are called Canephorae.## Figurative and literary usage.The phrase "to hell in a handbasket" means "to deteriorate rapidly". The origin of this use is unclear."Basket" is sometimes used as an adjective towards a person who.

Basket. is born out of wedlock. This occurs more commonly in British English. "Basket" also refers to a bulge in a man's crotch.## Materials.Basket makers use a wide range of materials:WickerStrawPlasticMetalBambooPalmCarbon fiber Basket weaving "Canephorae" Weaving Native American basketry Native American basket weavers Baleen basketry Fruits Basket "Japanese Manga series"Zepeda, Ofelia (1995). "Ocean Power: Poems from the Desert". .Baskets, The Women's Committee of the Philadelphia Museum of ArtBaskets at the University of Michigan Museum of ArtBaskets at the Metropolitan Museum of ArtExhibition: "A Measure of the Earth: The Cole-Ware Collection of American Baskets" at the Smithsonian American Art MuseumStudy Lab: "Entwined.


Question: In which year was this building published?

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Strapless. Strapless is a 1989 film written and directed by David Hare.## Plot summary.An expatriate American doctor in London allows herself to lighten up when her freewheeling younger sister and a mysterious man enter her life. Her inhibitions released, the beautiful doctor learns that freedom has its own price.Blair Brown – Dr. Lillian HempelBruno Ganz – Raymond ForbesBridget Fonda – Amy HempelAlan Howard – Mr. CooperMichael Gough – Douglas BrodieHugh Laurie – ColinDana Gillespie – Julie KovagoSpencer Leigh – HusAlexandra Pigg - Helen## Release.After the film's May 1990 U.S. theatrical release, it was released on videocassette in the United States by.


Question: Where is this bird native to?

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Nene (bird). The nene (Branta sandvicensis), also known as the nēnē or the Hawaiian goose, is a species of bird endemic to the Hawaiian Islands. The nene is exclusively found in the wild on the islands of Oahu, Maui, Kauai, Molokai, and Hawaii. In 1957, it was designated as the official state bird of state of Hawaii.The Hawaiian name "nēnē" comes from its soft call. The specific name "sandvicensis" refers to the Sandwich Islands, a former name for the Hawaiian Islands.## Taxonomy.The holotype specimen of "Anser sandvicensis" Vigors (List Anim. Garden Zool. Soc., ed.3, June 1833, p.4.) is held in the vertebrate.

Nene (bird). zoology collection at World Museum, National Museums Liverpool, with accession number NML-VZ T12706. The specimen was collected from the Sandwich Islands (Hawaiian Islands) and came to the Liverpool national collection via the Museum of the Zoological Society of London collection, Thomas Campbell Eyton’s collection, and Henry Baker Tristram’s collection.It is thought that the nene evolved from the Canada goose ("Branta canadensis"), which most likely arrived on the Hawaiian islands about 500,000 years ago, shortly after the island of Hawaii was formed. This ancestor is the progenitor of the nene as well as the prehistoric giant Hawaii goose ("Branta rhuax") and.

Nene (bird). nēnē-nui ("Branta hylobadistes"). The nēnē-nui was larger than the nene, varied from flightless to flighted depending on the individual, and inhabited the island of Maui. Similar fossil geese found on Oahu and Kauai may be of the same species. The giant Hawaii goose was restricted to the island of Hawaii and measured 1.2 (m) in length with a mass of 8.6 (kg), making it more than four times larger than the nene. It is believed that the herbivorous giant Hawaii goose occupied the same ecological niche as the goose-like ducks known as moa-nalo, which were not present on the Big.

Nene (bird). Island. Based on mitochondrial DNA found in fossils, all Hawaiian geese, living and extinct, are closely related to the giant Canada goose ("B. c. maxima") and dusky Canada goose ("B. c. occidentalis").## Description.The nene is a medium-sized goose at 41 (cm) tall. Although they spend most of their time on the ground, they are capable of flight, with some individuals flying daily between nesting and feeding areas. Females have a mass of 1.525 - 2.56 (kg), while males average 1.695 - 3.05 (kg), 11% larger than females. Adult males have a black head and hindneck, buff cheeks and heavily furrowed.

Nene (bird). Some populations migrated between lowland breeding grounds and montane foraging areas.The nene could at one time be found on the islands of Hawaii, Maui, Kahoolawe, Lānai, Molokai, Oʻahu and Kauai. Today, its range is restricted to Hawaii, Maui, Molokai, and Kauai. A pair arrived at the James Campbell National Wildlife Refuge on Oʻahu in January 2014; two of their offspring survived and are seen regularly on the nearby golf courses at Turtle Bay Resort.## Ecology and behavior.## Breeding.The breeding season of the nene, from August to April, is longer than that of any other goose; most eggs are laid between.

Nene (bird). November and January. Unlike most other waterfowl, the nene mates on land. Nests are built by females on a site of her choosing, in which one to five eggs are laid (average is three on Maui and Hawaii, four on Kauai). Females incubate the eggs for 29 to 32 days, while the male acts as a sentry. Goslings are precocial, able to feed on their own; they remain with their parents until the following breeding season.## Diet.The nene is a herbivore that will either graze or browse, depending on the availability of vegetation. Food items include the leaves, seeds, fruit,.

Nene (bird). and flowers of grasses and shrubs.## Conservation.The nene population stands at 2,500 birds, making it the world's rarest goose. It is believed that it was once common, with approximately 25,000 Hawaiian geese living in Hawaii when Captain James Cook arrived in 1778. Hunting and introduced predators, such as small Indian mongooses, pigs, and feral cats, reduced the population to 30 birds by 1952. The species breeds well in captivity, and has been successfully re-introduced. In 2004, it was estimated that there were 800 birds in the wild, as well as 1,000 in wildfowl collections and zoos. There is concern about.

Nene (bird). inbreeding due to the small initial population of birds. The nature reserve WWT Slimbridge, in England, was instrumental in the successful breeding of Hawaiian geese in captivity. Under the direction of conservationist Peter Scott, it was bred back from the brink of extinction during the 1950s for later re-introduction into the wild in Hawaii. There are still Hawaiian geese at Slimbridge today. They can now be found in captivity in multiple WWT centres. Successful introductions include Haleakala and Piiholo ranches on Maui.


Question: What equipment or engine is used by this item to provide power?

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Electric motor. An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.Electric motors can be powered by direct current (DC) sources, such as from batteries, or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators.Electric.

Electric motor. braking with traction motors, electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction.Electric motors produce linear or rotary force (torque) intended to propel some external mechanism, such as a fan or an elevator. An electric motor is generally designed for continuous rotation, or for linear movement over a significant distance compared to its size. Magnetic solenoids are also transducers that convert electrical power to mechanical motion, but can produce motion over only a limited distance.## History.## Early motors.Before modern electromagnetic motors, experimental motors that worked by electrostatic force.

Electric motor. persistent electric currents. Hans Christian Ørsted discovered in 1820 that an electric current creates a magnetic field, which can exert a force on a magnet. It only took a few weeks for André-Marie Ampère to develop the first formulation of the electromagnetic interaction and present the Ampère's force law, that described the production of mechanical force by the interaction of an electric current and a magnetic field. The first demonstration of the effect with a rotary motion was given by Michael Faraday on 3 September 1821 in the basement of the Royal Institution. A free-hanging wire was dipped into a.

Electric motor. pool of mercury, on which a permanent magnet (PM) was placed. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a close circular magnetic field around the wire. Faraday published the results of his discovery in the "Quarterly Journal of Science", and sent copies of his paper along with pocket-sized models of his device to colleagues around the world so they could also witness the phenomenon of electromagnetic rotations. This motor is often demonstrated in physics experiments, substituting brine for (toxic) mercury. Barlow's wheel was an early refinement.

Electric motor. to this Faraday demonstration, although these and similar homopolar motors remained unsuited to practical application until late in the century.In 1827, Hungarian physicist Ányos Jedlik started experimenting with electromagnetic coils. After Jedlik solved the technical problems of continuous rotation with the invention of the commutator, he called his early devices "electromagnetic self-rotors". Although they were used only for teaching, in 1828 Jedlik demonstrated the first device to contain the three main components of practical DC motors: the stator, rotor and commutator. The device employed no permanent magnets, as the magnetic fields of both the stationary and revolving components were produced.

Electric motor. then higher performance.In 1855, Jedlik built a device using similar principles to those used in his electromagnetic self-rotors that was capable of useful work. He built a model electric vehicle that same year.A major turning point came in 1864, when Antonio Pacinotti first described the ring armature (although initially conceived in a DC generator, i.e. a dynamo). This featured symmetrically-grouped coils closed upon themselves and connected to the bars of a commutator, the brushes of which delivered practically non-fluctuating current. The first commercially successful DC motors followed the developments by Zénobe Gramme who, in 1871, reinvented Pacinotti's design and adopted.

Electric motor. from such tasks as handling grain or pumping water. Household uses (like in washing machines, dishwashers, fans, air conditioners and refrigerators (replacing ice boxes)) of electric motors reduced heavy labor in the home and made higher standards of convenience, comfort and safety possible. Today, electric motors consume more than half of the electric energy produced in the US.## AC motors.In 1824, French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago's rotations, which, by manually turning switches on and off, Walter Baily demonstrated in 1879 as in effect the first primitive induction motor. In the 1880s many.

Electric motor. stator, which does not. It also includes two electrical parts, a set of magnets and an armature, one of which is attached to the rotor and the other to the stator, together forming a magnetic circuit: Field magnets - The magnets create a magnetic field that passes through the armature. These can be electromagnets or permanent magnets. The field magnet is usually on the stator and the armature on the rotor, but in some types of motor these are reversed.## Bearings.The rotor is supported by bearings, which allow the rotor to turn on its axis. The bearings are in turn.

Electric motor. supported by the motor housing.## Rotor.The rotor is the moving part that delivers the mechanical power. The rotor typically holds conductors that carry currents, which the magnetic field of the stator exerts force on to turn the shaft. Alternatively, some rotors carry permanent magnets, and the stator holds the conductors. Permanent magnets offer high efficiency over a larger operating speed and power range.An air gap between the stator and rotor allows it to turn. The width of the gap has a significant effect on the motor's electrical characteristics. It is generally made as small as possible, as a large gap.

Electric motor. weakens performance. It is the main source of the low power factor at which motors operate. The magnetizing current increases and the power factor decreases with the air gap, so narrow gaps are better. Conversely, gaps that are too small may pose mechanical problems in addition to noise and losses.The motor shaft extends through the bearings to the outside of the motor, where the load is applied. Because the forces of the load are exerted beyond the outermost bearing, the load is said to be overhung.## Stator.The stator surrounds the rotor, and usually holds field magnets, which are either electromagnets.

Electric motor. consisting of wire windings around a ferromagnetic iron core or permanent magnets. These create a magnetic field that passes through the rotor armature, exerting force on the windings. The stator core is made up of many thin metal sheets that are insulated from each other, called laminations. Laminations are used to reduce energy losses that would result if a solid core were used. Resin-packed motors, used in washing machines and air conditioners, use the damping properties of resin (plastic) to reduce noise and vibration. These motors encapsulate the stator in plastic.## Armature.The armature consists of wire windings on a ferromagnetic.

Electric motor. core. Electric current passing through the wire causes the magnetic field from the field magnet to exert a force (Lorentz force) on it, turning the rotor, which delivers the mechanical output. Windings are wires that are laid in coils, usually wrapped around a laminated, soft, iron, ferromagnetic core so as to form magnetic poles when energized with current.Electric machines come in salient- and nonsalient-pole configurations. In a salient-pole motor the ferromagnetic cores on the rotor and stator have projections called poles facing each other, with a wire winding around each pole below the pole face, which become north or south.

Electric motor. poles of the magnetic field when current flows through the wire. In a nonsalient-pole (or distributed field or round-rotor) motor, the ferromagnetic core is a smooth cylinder, with the windings distributed evenly in slots about the circumference. Supplying alternating current in the windings creates poles in the core that rotate continuously. A shaded-pole motor has a winding around part of the pole that delays the phase of the magnetic field for that pole.## Commutator.A commutator is a rotary electrical switch that supplies current to the rotor. It periodically reverses the flow of current in the rotor windings as the shaft.

Electric motor. each rotor winding would reverse with each half turn, so the rotor would stop. Commutators are inefficient and commutated motors have been mostly replaced by brushless direct current motors, permanent magnet motors, and induction motors.## Motor supply and control.## Motor supply.A DC motor is usually supplied through a split ring commutator as described above. AC motors' commutation can be achieved using either a slip ring commutator or external commutation. It can be fixed-speed or variable-speed control type, and can be synchronous or asynchronous. Universal motors can run on either AC or DC.## Motor control.DC motors can be operated at variable.

Electric motor. speeds by adjusting the voltage applied to the terminals or by using pulse-width modulation (PWM).AC motors operated at a fixed speed are generally powered directly from the grid or through motor soft starters.AC motors operated at variable speeds are powered with various power inverter, variable-frequency drive or electronic commutator technologies.The term electronic commutator is usually associated with self-commutated brushless DC motor and switched reluctance motor applications.## Types.Electric motors operate on one of three physical principles: magnetism, electrostatics and piezoelectricity.In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise.

Electric motor. to a force, and thus a torque on the motor shaft. One, or both, of these fields must change with the rotation of the rotor. This is done by switching the poles on and off at the right time, or varying the strength of the pole.The main types are DC motors and AC motors, with the latter replacing the former. AC electric motors are either asynchronous or synchronous.Once started, a synchronous motor requires synchrony with the moving magnetic field's speed for all normal torque conditions.In synchronous machines, the magnetic field must be provided by means other than induction, such as.

Electric motor. from separately excited windings or permanent magnets.A fractional-horsepower motor either has a rating below about 1 horsepower (0.746 kW), or is manufactured with a standard-frame size smaller than a standard 1 HP motor. Many household and industrial motors are in the fractional-horsepower class.Notes: Rotation is independent of the frequency of the AC voltage. Rotation is equal to synchronous speed (motor-stator-field speed). In SCIM, fixed-speed operation rotation is equal to synchronous speed, less slip speed. In non-slip energy-recovery systems, WRIM is usually used for motor-starting but can be used to vary load speed. Variable-speed operation. Whereas induction- and synchronous-motor drives are.

Electric motor. typically with either six-step or sinusoidal-waveform output, BLDC-motor drives are usually with trapezoidal-current waveform; the behavior of both sinusoidal and trapezoidal PM machines is, however, identical in terms of their fundamental aspects. In variable-speed operation, WRIM is used in slip-energy recovery and double-fed induction-machine applications. A cage winding is a shorted-circuited squirrel-cage rotor, a wound winding is connected externally through slip rings. Mostly single-phase with some three-phase.Abbreviations: BLAC – Brushless AC BLDC – Brushless DC BLDM – Brushless DC motor EC – Electronic commutator PM – Permanent magnet IPMSM – Interior permanent-magnet synchronous motor PMSM – Permanent magnet synchronous motor.

Electric motor. SPMSM – Surface permanent magnet synchronous motor SCIM – Squirrel-cage induction motor SRM – Switched reluctance motor SyRM – Synchronous reluctance motor VFD – Variable-frequency drive WRIM – Wound-rotor induction motor WRSM – Wound-rotor synchronous motor LRA – Locked-rotor amps: The current you can expect under starting conditions when you apply full voltage. It occurs instantly during start-up. RLA – Rated-load amps: The maximum current a motor should draw under any operating conditions. Often mistakenly called running-load amps, which leads people to believe, incorrectly, that the motor should always pull these amps. FLA – Full-load amps: Changed in 1976 to.

Electric motor. "RLA – rated-load amps".## Self-commutated motor.## Brushed DC motor.Most DC motors are small permanent magnet (PM) types. They contain a brushed internal mechanical commutation to reverse motor windings' current in synchronism with rotation.## Electrically excited DC motor.A commutated DC motor has a set of rotating windings wound on an armature mounted on a rotating shaft. The shaft also carries the commutator. Thus, every brushed DC motor has AC flowing through its windings. Current flows through one or more pairs of brushes that touch the commutator; the brushes connect an external source of electric power to the rotating armature.The rotating armature.

Electric motor. consists of one or more wire coils wound around a laminated, magnetically "soft" ferromagnetic core. Current from the brushes flows through the commutator and one winding of the armature, making it a temporary magnet (an electromagnet). The magnetic field produced interacts with a stationary magnetic field produced by either PMs or another winding (a field coil), as part of the motor frame. The force between the two magnetic fields rotates the shaft. The commutator switches power to the coils as the rotor turns, keeping the poles from ever fully aligning with the magnetic poles of the stator field, so that.

Electric motor. – A set of windings that produces a magnetic field. Commutation: A mechanical technique in which rectification can be achieved, or from which DC can be derived.The five types of brushed DC motor are: Shunt-wound Series-wound Compound (two configurations): Cumulative compound Differentially compounded Permanent magnet (not shown) Separately excited (not shown).## Permanent magnet.A permanent magnet (PM) motor does not have a field winding on the stator frame, relying instead on PMs to provide the magnetic field. Compensating windings in series with the armature may be used on large motors to improve commutation under load. This field is fixed and cannot.

Electric motor. be adjusted for speed control. PM fields (stators) are convenient in miniature motors to eliminate the power consumption of the field winding. Most larger DC motors are of the "dynamo" type, which have stator windings. Historically, PMs could not be made to retain high flux if they were disassembled; field windings were more practical to obtain the needed flux. However, large PMs are costly, as well as dangerous and difficult to assemble; this favors wound fields for large machines.To minimize overall weight and size, miniature PM motors may use high energy magnets made with neodymium; most are neodymium-iron-boron alloy. With.

Electric motor. their higher flux density, electric machines with high-energy PMs are at least competitive with all optimally designed singly-fed synchronous and induction electric machines. Miniature motors resemble the structure in the illustration, except that they have at least three rotor poles (to ensure starting, regardless of rotor position) and their outer housing is a steel tube that magnetically links the exteriors of the curved field magnets.## Electronic commutator (EC).## Brushless DC.Some of the problems of the brushed DC motor are eliminated in the BLDC design. In this motor, the mechanical "rotating switch" or commutator is replaced by an external electronic switch.

Electric motor. synchronised to the rotor's position. BLDC motors are typically 85%+ efficient, reaching up to 96.5%, while brushed DC motors are typically 75–80% efficient.The BLDC motor's characteristic trapezoidal counter-electromotive force (CEMF) waveform is derived partly from the stator windings being evenly distributed, and partly from the placement of the rotor's permanent magnets. Also known as electronically commutated DC or inside-out DC motors, the stator windings of trapezoidal BLDC motors can be single-phase, two-phase or three-phase and use Hall effect sensors mounted on their windings for rotor position sensing and low cost closed-loop commutator control.BLDC motors are commonly used where precise speed.

Electric motor. motors are usually used in small equipment such as computers and are generally used in fans to remove heat. They make little noise, which is an advantage in equipment that is affected by vibrations.Modern BLDC motors range in power from a fraction of a watt to many kilowatts. Larger BLDC motors rated up to about 100 kW are used in electric vehicles. They also find use in electric model aircraft.## Switched reluctance motor.The switched reluctance motor (SRM) has no brushes or permanent magnets, and the rotor has no electric currents. Torque comes from a slight misalignment of poles on the.

Electric motor. rotor with poles on the stator. The rotor aligns itself with the magnetic field of the stator, while the stator field windings are sequentially energized to rotate the stator field.The magnetic flux created by the field windings follows the path of least magnetic sending the flux through rotor poles that are closest to the energized poles of the stator, thereby magnetizing those poles of the rotor and creating torque. As the rotor turns, different windings are energized, keeping the rotor turning.SRMs are used in some appliances and vehicles.## Universal AC/DC motor.A commutated, electrically excited, series or parallel wound motor is.

Electric motor. referred to as a universal motor because it can be designed to operate on either AC or DC power. A universal motor can operate well on AC because the current in both the field and the armature coils (and hence the resultant magnetic fields) synchronously reverse polarity, and hence the resulting mechanical force occurs in a constant direction of rotation.Operating at normal power line frequencies, universal motors are often used in sub-kilowatt applications. Universal motors formed the basis of the traditional railway traction motor in electric railways. In this application, using AC power on a motor designed to run on.

Electric motor. DC would experience efficiency losses due to eddy current heating of their magnetic components, particularly the motor field pole-pieces that, for DC, would have used solid (un-laminated) iron. They are now rarely used.An advantage is that AC power may be used on motors that specifically have high starting torque and compact design if high running speeds are used. By contrast, maintenance is higher and lifetimes are shortened. Such motors are used in devices that are not heavily used, and have high starting-torque demands. Multiple taps on the field coil provide (imprecise) stepped speed control. Household blenders that advertise many speeds.

Electric motor. an asynchronous AC motor where power is transferred to the rotor by electromagnetic induction, much like transformer action. An induction motor resembles a rotating transformer, because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. Polyphase induction motors are widely used in industry.## Cage and wound rotor.Induction motors may be divided into Squirrel Cage Induction Motors (SCIM) and Wound Rotor Induction Motors (WRIM). SCIMs have a heavy winding made up of solid bars, usually aluminum or copper, electrically connected by rings at the ends of the rotor. The.

Electric motor. bars and rings as a whole are much like an animal's rotating exercise cage.Currents induced into this winding provide the rotor magnetic field. The shape of the rotor bars determines the speed-torque characteristics. At low speeds, the current induced in the squirrel cage is nearly at line frequency and tends to stay in the outer parts of the cage. As the motor accelerates, the slip frequency becomes lower, and more current reaches the interior. By shaping the bars to change the resistance of the winding portions in the interior and outer parts of the cage, a variable resistance is effectively.

Electric motor. steering wheels.Another common application is to control the throttle of an internal combustion engine with an electronic governor. The motor works against a return spring to move the throttle in accord with the governor output. The latter monitors engine speed by counting electrical pulses from the ignition system or from a magnetic pickup and depending on the speed, makes small adjustments to the amount of current. If the engine slows down relative to the desired speed, the current increases, producing more torque, pulling against the return spring and opening the throttle. Should the engine run too fast, the governor reduces.

Electric motor. the current, allowing the return spring to pull back and reduce the throttle.## Synchronous motor.A synchronous electric motor is an AC motor. It includes a rotor spinning with coils passing magnets at the same frequency as the AC and produces a magnetic field to drive it. It has zero slip under typical operating conditions. By contrast induction motors must slip to produce torque. One type of synchronous motor is like an induction motor except that the rotor is excited by a DC field. Slip rings and brushes conduct current to the rotor. The rotor poles connect to each other and.

Electric motor. when slip rate decreases sufficiently, the rotor (a smooth cylinder) becomes temporarily magnetized. Its distributed poles make it act like a permanent magnet synchronous motor. The rotor material, like that of a common nail, stays magnetized, but can be demagnetized with little difficulty. Once running, the rotor poles stay in place; they do not drift.Low-power synchronous timing motors (such as those for traditional electric clocks) may have multi-pole permanent magnet external cup rotors, and use shading coils to provide starting torque. "Telechron" clock motors have shaded poles for starting torque, and a two-spoke ring rotor that performs like a discrete.

Electric motor. allows for a smaller electronic converter but the cost of the rotor winding and slip rings may offset the saving in the power electronics components. Difficulties affect controlling speed near synchronous speed limit applications.## Special magnetic motors.## Rotary.## Ironless or coreless rotor motor.The coreless or ironless DC motor is a specialized permanent magnet DC motor. Optimized for rapid acceleration, the rotor is constructed without an iron core. The rotor can take the form of a winding-filled cylinder, or a self-supporting structure comprising only wire and bonding material. The rotor can fit inside the stator magnets; a magnetically soft stationary cylinder.

Electric motor. inside the rotor provides a return path for the stator magnetic flux. A second arrangement has the rotor winding basket surrounding the stator magnets. In that design, the rotor fits inside a magnetically soft cylinder that can serve as the motor housing, and provides a return path for the flux.Because the rotor is much lower mass than a conventional rotor, it can accelerate much more rapidly, often achieving a mechanical time constant under one millisecond. This is especially true if the windings use aluminum rather than (heavier) copper. The rotor has no metal mass to act as a heat sink;.

Electric motor. even small motors must be cooled. Overheating can be an issue for these designs.The vibrating alert of cellular phones can be generated by cylindrical permanent-magnet motors, or disc-shaped types that have a thin multipolar disc field magnet, and an intentionally unbalanced molded-plastic rotor structure with two bonded coreless coils. Metal brushes and a flat commutator switch power to the rotor coils.Related limited-travel actuators have no core and a bonded coil placed between the poles of high-flux thin permanent magnets. These are the fast head positioners for rigid-disk ("hard disk") drives. Although the contemporary design differs considerably from that of loudspeakers,.

Electric motor. it is still loosely (and incorrectly) referred to as a "voice coil" structure, because some earlier rigid-disk-drive heads moved in straight lines, and had a drive structure much like that of a loudspeaker.## Pancake or axial rotor motor.The printed armature or pancake motor has windings shaped as a disc running between arrays of high-flux magnets. The magnets are arranged in a circle facing the rotor spaced to form an axial air gap. This design is commonly known as the pancake motor because of its flat profile.The armature (originally formed on a printed circuit board) is made from punched copper sheets.

Electric motor. with 180 (C), Class H rating.The unique advantage of ironless DC motors is the absence of cogging (torque variations caused by changing attraction between the iron and the magnets). Parasitic eddy currents cannot form in the rotor as it is totally ironless, although iron rotors are laminated. This can greatly improve efficiency, but variable-speed controllers must use a higher switching rate (>40 kHz) or DC because of decreased electromagnetic induction.These motors were invented to drive the capstan(s) of magnetic tape drives, where minimal time to reach operating speed and minimal stopping distance were critical. Pancake motors are widely used in.

Electric motor. high-performance servo-controlled systems, robotic systems, industrial automation and medical devices. Due to the variety of constructions now available, the technology is used in applications from high temperature military to low cost pump and basic servos.Another approach (Magnax) is to use a single stator sandwiched between two rotors. One such design has produced peak power of 15 kW/kg, sustained power around 7.5 kW/kg. This yokeless axial flux motor offers a shorter flux path, keeping the magnets further from the axis. The design allows zero winding overhang; 100 percent of the windings are active. This is enhanced with the use of rectangular-crosssection.

Electric motor. copper wire. The motors can be stacked to work in parallel. Instabilities are minimized by ensuring that the two rotor discs put equal and opposing forces onto the stator disc. The rotors are connected directly to one another via a shaft ring, cancelling out the magnetic forces.Magnax motors range in size from 0.15-5.4 (m) in diameter.## Servo motor.A servo motor is a motor that is used within a position-control or speed-control feedback system. Servomotors are used in applications such as machine tools, pen plotters, and other process systems. Motors intended for use in a servomechanism must have predictable characteristics for.

Electric motor. speed, torque, and power. The speed/torque curve is important and is high ratio for a servo motor. Dynamic response characteristics such as winding inductance and rotor inertia are important; these factors limit performance. Large, powerful, but slow-responding servo loops may use conventional AC or DC motors and drive systems with position or speed feedback. As dynamic response requirements increase, more specialized motor designs such as coreless motors are used. AC motors' superior power density and acceleration characteristics tends to favor permanent magnet synchronous, BLDC, induction, and SRM drive approaches.A servo system differs from some stepper motor applications in that position.

Electric motor. feedback is continuous while the motor is running. A stepper system inherently operates open-loop—relying on the motor not to "miss steps" for short term accuracy—with any feedback such as a "home" switch or position encoder external to the motor system.## Stepper motor.Stepper motors are typically used to provide precise rotations. An internal rotor containing permanent magnets or a magnetically soft rotor with salient poles is controlled by a set of electronically switched external magnets. A stepper motor may also be thought of as a cross between a DC electric motor and a rotary solenoid. As each coil is energized in.

Electric motor. turn, the rotor aligns itself with the magnetic field produced by the energized field winding. Unlike a synchronous motor, the stepper motor may not rotate continuously; instead, it moves in steps—starting and then stopping—advancing from one position to the next as field windings are energized and de-energized in sequence. Depending on the sequence, the rotor may turn forwards or backwards, and it may change direction, stop, speed up or slow down at any time.Simple stepper motor drivers entirely energize or entirely de-energize the field windings, leading the rotor to "cog" to a limited number of positions. Microstepping drivers can proportionally.

Electric motor. made them uncompetitive—thus newer hard disk drives use voice coil-based head actuator systems. (The term "voice coil" in this connection is historic; it refers to the structure in a cone-type loudspeaker.)Stepper motors are often used in computer printers, optical scanners, and digital photocopiers to move the active element, the print head carriage (inkjet printers), and the platen or feed rollers.So-called quartz analog wristwatches contain the smallest commonplace stepping motors; they have one coil, draw little power, and have a permanent magnet rotor. The same kind of motor drives battery-powered quartz clocks. Some of these watches, such as chronographs, contain more.

Electric motor. 1978 era HP 7225A pen plotter used two linear stepper motors to move the pen along the X and Y axes.## Electromagnetism.## Force and torque.An electric motor converts electrical energy to mechanical energy through the force between two opposed magnetic fields. At least one of the two magnetic fields must be created by an electromagnet through the magnetic field caused by an electrical current.The force between a current formula_1 in a conductor of length formula_2 perpendicular to a magnetic field formula_3 may be calculated using the Lorentz force law: formula_4Note: X denotes vector cross product. The most general approaches to.

Electric motor. resistance Ir2 – square of current induced in the rotor s – motor slip; i.e., difference between synchronous speed and slip speed, which provides the relative movement needed for current induction in the rotor.## Back EMF.The movement of armature windings of a direct-current or universal motor through a magnetic field, induce a voltage in them. This voltage tends to oppose the motor supply voltage and so is called "back electromotive force (EMF)". The voltage is proportional to the running speed of the motor. The back EMF of the motor, plus the voltage drop across the winding internal resistance and brushes,.

Electric motor. enacted legislation to encourage the manufacture and use of higher-efficiency motors. Electric motors have efficiencies ranging from at least 15% for shaded pole motors, up to 98% for permanent magnet motors, with efficiency also dependent on load. Peak efficiency is usually at 75% of the rated load. So (as an example) a 10 HP motor is most efficient when driving a load that requires 7.5 HP. Efficiency also depends on motor size; larger motors tend to be more efficient. Some motors can not operate continually for more than a specified period of time (e.g. for more than an hour per.

Electric motor. run)## Goodness factor.Eric Laithwaite proposed a metric to determine the 'goodness' of an electric motor: formula_21Where: formula_22 is the goodness factor (factors above 1 are likely to be efficient) formula_23 are the cross sectional areas of the magnetic and electric circuit formula_24 are the lengths of the magnetic and electric circuits formula_25 is the permeability of the core formula_20 is the angular frequency the motor is driven atFrom this, he showed that the most efficient motors are likely to have relatively large magnetic poles. However, the equation only directly relates to non PM motors.## Performance parameters.## Torque.Electromagnetic motors derive torque.

Electric motor. from the vector product of the interacting fields. Calculating torque requires knowledge of the fields in the air gap. Once these have been established, the torque is the integral of all the force vectors multiplied by the vector's radius. The current flowing in the winding produces the fields. For a motor using a magnetic material the field is not proportional to the current.A figure relating the current to the torque can inform motor selection. The maximum torque for a motor depends on the maximum current, absent thermal considerations.When optimally designed within a given core saturation constraint and for a given.

Electric motor. active current (i.e., torque current), voltage, pole-pair number, excitation frequency (i.e., synchronous speed), and air-gap flux density, all categories of electric motors/generators exhibit virtually the same maximum continuous shaft torque (i.e., operating torque) within a given air-gap area with winding slots and back-iron depth, which determines the physical size of electromagnetic core. Some applications require bursts of torque beyond the maximum, such as bursts to accelerate an electric vehicle from standstill. Always limited by magnetic core saturation or safe operating temperature rise and voltage, the capacity for torque bursts beyond the maximum differs significantly across motor/generator types.Electric machines without a.

Electric motor. transformer circuit topology, such as that of WRSMs or PMSMs, cannot provide torque bursts without saturating the magnetic core. At that point, additional current cannot increase torque. Furthermore, the permanent magnet assembly of PMSMs can be irreparably damaged.Electric machines with a transformer circuit topology, such as induction machines, induction doubly-fed electric machines, and induction or synchronous wound-rotor doubly-fed (WRDF) machines, permit torque bursts because the EMF-induced active current on either side of the transformer oppose each other and thus contribute nothing to the transformer coupled magnetic core flux density, avoiding core saturation.Electric machines that rely on induction or asynchronous principles.

Electric motor. the air-gap area and the back-iron depth, which are determined by the power rating of the armature winding set, the speed of the machine, and the achievable air-gap flux density before core saturation. Despite the high coercivity of neodymium or samarium-cobalt permanent magnets, continuous torque density is virtually the same amongst electric machines with optimally designed armature winding sets. Continuous torque density relates to method of cooling and permissible operation period before destruction by overheating of windings or permanent magnet damage.Other sources state that various e-machine topologies have differing torque density. One source shows the following:where—specific torque density is normalized.

Electric motor. to 1.0 for the surface permanent magnet (SPM)—brushless ac, 180° current conduction.Torque density is approximately four times greater for liquid cooled motors, compared to those which are air cooled.A source comparing direct current, induction motors (IM), PMSM and SRM showed:Another source notes that PMSM up to 1 MW have considerably higher torque density than induction machines.## Continuous power density.The continuous power density is determined by the product of the continuous torque density and the constant torque speed range. Electric motors can achieve densities of up to 20KW/KG, meaning 20 Kilowatts of output power per kilogram.## Acoustic noise and vibrations.Acoustic noise.

Electric motor. and vibrations are usually classified in three sources: mechanical sources (e.g. due to bearings) aerodynamic sources (e.g. due to shaft-mounted fans) magnetic sources (e.g. due to magnetic forces such as Maxwell and magnetostriction forces acting on stator and rotor structures)The latter source, which can be responsible for the "whining noise" of electric motors, is called electromagnetically induced acoustic noise.## Standards.The following are major design, manufacturing, and testing standards covering electric motors: American Petroleum Institute: API 541 Form-Wound Squirrel Cage Induction Motors – 375 kW (500 Horsepower) and Larger American Petroleum Institute: API 546 Brushless Synchronous Machines – 500 kVA and.

Electric motor. 60072 Dimensions and output series for rotating electrical machines National Electrical Manufacturers Association: MG-1 Motors and Generators Underwriters Laboratories: UL 1004 – Standard for Electric Motors Indian Standard: IS:12615-2018 – Line Operated Three Phase a.c. Motors (IE CODE) “Efficiency Classes and Performance Specification” (Third Revision)## Non-magnetic motors.An electrostatic motor is based on the attraction and repulsion of electric charge. Usually, electrostatic motors are the dual of conventional coil-based motors. They typically require a high-voltage power supply, although small motors employ lower voltages. Conventional electric motors instead employ magnetic attraction and repulsion, and require high current at low voltages. In the.

Electric motor. produces acoustic or ultrasonic vibrations to produce linear or rotary motion. In one mechanism, the elongation in a single plane is used to make a series of stretches and position holds, similar to the way a caterpillar moves.An electrically powered spacecraft propulsion system uses electric motor technology to propel spacecraft in outer space. Most systems are based on electrically accelerating propellant to high speed, while some systems are based on electrodynamic tethers principles of propulsion to the magnetosphere. Electric generator Regenerative brake Goodness factor Motor capacitor Traction motor Motor controller Houston, Edwin J.; Kennelly, Arthur, "Recent Types of Dynamo-Electric Machinery",.


Question: In which year was this object invented or discovered?

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Variometer. of little interest during launching and landing, with the exception of aerotow, where the pilot will usually want to avoid releasing in sink.## History.In 1930, according to Ann Welch, "Kronfeld...was one of the first to use a variometer, a device suggested by Alexander Lippisch." Welch goes on to state that the "first real thermal soaring" occurred in 1930 by A. Haller and Wolf Hirth, with Hirth using a variometer in his Musterle. Frank Irving states that Arthur Kantrowitz first mentioned total energy in 1940. However, as early as 1901, Wilbur Wright wrote about thermals, "when gliding operators have attained greater.

Variometer. without the use of a variometer. After the variometer was invented in 1929 by Alexander Lippisch and Robert Kronfeld, the sport of gliding moved into a new realm.Variometers also became important in foot-launch hang gliding, where the open-to-air pilot hears the wind but needs the variometer to help him or her to detect regions of rising or sinking air. In early hang gliding, variometers were not needed for the short flights or flights close to ridge lift. But the variometer became key as pilots began making longer flights. The first portable variometer for use in hang gliders was the Colver.


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Road. a road for the environment in order to extend its longevity and reduce maintenance. The Shell pavement design method is used in many countries for the design of new asphalt roadsides.Adverse camber: Where a road slopes towards the outside of a bend, increasing the likelihood that vehicles travelling at speed will skid or topple. Usually only a temporary situation during road maintenance.Alignment: The route of the road, defined as a series of horizontal tangents and curves.All-weather road: Unpaved road that is constructed of a material that does not create mud during rainfall.Banked turnBelisha Beacon: An orange globe, lit at night,.

Road. drivers pay an average of $746/year on vehicle repairs while the average US motorist pays about $335/year. In contrast, the average motorist pays about $171/year in road maintenance taxes (based on 600 gallons/year and $0.285/gallon tax).## Slab stabilization.Distress and serviceability loss on concrete roads can be caused by loss of support due to voids beneath the concrete pavement slabs. The voids usually occur near cracks or joints due to surface water infiltration. The most common causes of voids are pumping, consolidation, subgrade failure and bridge approach failure. Slab stabilization is a non-destructive method of solving this problem and is usually.


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La Recoleta Cemetery. La Recoleta Cemetery () is a cemetery located in the Recoleta neighbourhood of Buenos Aires, Argentina. It contains the graves of notable people, including Eva Perón, presidents of Argentina, Nobel Prize winners, the founder of the Argentine Navy, and military commanders like Julio Argentino Roca. In 2011, the BBC hailed it as one of the world's best cemeteries, and in 2013, CNN listed it among the 10 most beautiful cemeteries in the world.## History.Franciscan Recollect monks () arrived in this area, then the outskirts of Buenos Aires, in the early eighteenth century. The cemetery is built around the Recollect Convent.

La Recoleta Cemetery. imported from Paris and Milan. The entire cemetery is laid out in sections like city blocks, with wide tree-lined main walkways branching into sidewalks filled with mausoleums. These mausoleums are still being used by rich families in Argentina that have their own vault and keep their deceased there.While many of the mausoleums are in fine shape and well-maintained, others have fallen into disrepair. Several can be found with broken glass and littered with rubbish. Among many memorials are works by notable Argentine sculptors, Lola Mora and Luis Perlotti for instance. The tomb of Liliana Crociati de Szaszak, due to its.


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La Recoleta Cemetery. () and a church, Our Lady of Pilar ("), built in 1732.The order was disbanded in 1822, and the garden of the convent was converted into the first public cemetery in Buenos Aires. Inaugurated on 17 November of the same year under the name of " (Northern Cemetery), those responsible for its creation were the then-Governor Martin Rodríguez, who would be eventually buried in the cemetery, and government minister Bernardino Rivadavia.The 1822 layout was done by French civil engineer Próspero Catelin, who also designed the current facade of the Buenos Aires Metropolitan Cathedral. The cemetery was last remodeled in 1881,.


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Rock dove. The rock dove, rock pigeon, or common pigeon ( also ; Columba livia) is a member of the bird family Columbidae (doves and pigeons). In common usage, it is often simply referred to as the "pigeon".The domestic pigeon ("Columba livia domestica", which includes about 1,000 different breeds) descended from this species. Escaped domestic pigeons have increased the populations of feral pigeons around the world.Wild rock doves are pale grey with two black bars on each wing, whereas domestic and feral pigeons vary in colour and pattern. Few differences are seen between males and females. The species is generally monogamous, with.

Rock dove. 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's "Systema Naturae". He placed it with all the other doves and pigeons in the genus "Columba" and coined the binomial name "Columba livia". The genus name "Columba" is the Latin word meaning "pigeon, dove", whose older etymology comes from the Ancient Greek κόλυμβος ("kolumbos"), "a diver", from "κολυμβάω" (kolumbao), "dive, plunge headlong, swim". Aristophanes (Birds, 304) and others use the word κολυμβίς ("kolumbis"), "diver", for the name of the bird, because of its swimming motion in the air. The specific epithet "livia" is.

Rock dove. a medieval Latin variant of "livida", "livid, bluish-gray"; this was Theodorus Gaza's translation of Greek "peleia", "dove", itself thought to be derived from "pellos", "dark-colored". Its closest relative in the genus "Columba" is the hill pigeon, followed by the other rock pigeons: the snow, speckled, and white-collared pigeons. Pigeon chicks are called "squabs".Note that members of the lesser known pigeon genus "Petrophassa" and the speckled pigeon ("Columba guinea"), also have the common name “rock pigeon”.The rock dove was first described by German naturalist Johann Gmelin in 1789. The rock dove was central to Charles Darwin's discovery of evolution, and featured.

Rock dove. pigeon ("Columba livia domestica"). They may have been domesticated as long as 5,000 years ago. Numerous breeds of fancy pigeons of all sizes, colours, and types have been bred. Domesticated pigeons are used as homing pigeons as well as food and pets. They were in the past also used as carrier pigeons. ## War pigeons.So-called war pigeons have played significant roles during wartime, and many pigeons have received awards and medals for their services in saving hundreds of human lives.## Medical uses.Pigeons have notably been "employed" as medical imaging data sorters. They have been successfully trained under research conditions to.

Rock dove. pathogenic H5N1 virus from a Hong Kong sample. The birds received 100 to 1,000 times the concentration that wild birds would encounter in nature. "We couldn't infect the pigeons," Swayne said. "So that's good news." Rock dove - Species text in The Atlas of Southern African Birds.California Wildlife Center cautions about backyard invadersPower Requirements for Horizontal Flight in the Pigeon "Columba livia" -C. J. PENNYCUICK.


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Seehamer See. Seehamer See is a lake in the Alpine foothills, Bavaria, Germany. At an elevation of 653 m, its surface area is 1.47 km².List of lakes in Bavaria.


Question: What is the closest parent taxonomy of this animal?

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Crabeater seal. The crabeater seal (Lobodon carcinophaga), also known as the krill-eater seal, is a true seal with a circumpolar distribution around the coast of Antarctica. They are medium- to large-sized (over 2 m in length), relatively slender and pale-colored, found primarily on the free-floating pack ice that extends seasonally out from the Antarctic coast, which they use as a platform for resting, mating, social aggregation and accessing their prey. They are by far the most abundant seal species in the world. While population estimates are uncertain, there are at least 7 million and possibly as many as 75 million individuals. This.

Crabeater seal. name of the crabeater seal, "Lobodon", derives from Ancient Greek meaning "lobe-toothed", and the species name "carcinophaga" means "crab eater." The crabeater seal shares a common recent ancestor with the other Antarctic seals, which are together known as the lobodontine seals. These include the leopard seal ("Hydrurga leptonyx"), the Ross seal ("Ommatophoca rossii"), and the Weddell seal ("Leptonychotes weddelli"). These species, collectively belonging to the Lobodontini tribe of seals, share teeth adaptations including lobes and cusps useful for straining smaller prey items out of the water column. The ancestral Lobodontini likely diverged from their sister clade, the Mirounga (elephant seals).


Question: Who is the creator of this building?

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Statue of Zeus at Olympia. The Statue of Zeus at Olympia was a giant seated figure, about 12.4 (m) tall, made by the Greek sculptor Phidias around 435 BC at the sanctuary of Olympia, Greece, and erected in the Temple of Zeus there. Zeus is the sky and thunder god in ancient Greek religion, who rules as king of the gods of Mount Olympus.The statue was a chryselephantine sculpture of ivory plates and gold panels on a wooden framework. Zeus sat on a painted cedarwood throne ornamented with ebony, ivory, gold, and precious stones. It was one of the Seven Wonders of the Ancient World.

Statue of Zeus at Olympia. The statue was lost and destroyed during the 5th century AD; details of its form are known only from ancient Greek descriptions and representations on coins.## History.The statue of Zeus was commissioned by the Eleans, custodians of the Olympic Games, in the latter half of the fifth century BC for their newly constructed Temple of Zeus. Seeking to outdo their Athenian rivals, the Eleans employed sculptor Phidias, who had previously made the massive statue of Athena Parthenos in the Parthenon.The statue occupied half the width of the aisle of the temple built to house it. The geographer Strabo noted early.

Statue of Zeus at Olympia. of the image was paved with black tiles and surrounded by a raised rim of marble to contain the oil. This reservoir acted as a reflecting pool which doubled the apparent height of the statue.According to the Roman historian Livy, the Roman general Aemilius Paullus (the victor over Macedon) saw the statue and "was moved to his soul, as if he had seen the god in person", while the 1st-centuryAD Greek orator Dio Chrysostom declared that a single glimpse of the statue would make a man forget all his earthly troubles.According to a legend, when Phidias was asked what inspired.

Statue of Zeus at Olympia. him—whether he climbed Mount Olympus to see Zeus, or whether Zeus came down from Olympus so that Phidias could see him—the artist answered that he portrayed Zeus according to Book One, verses 528–530 of Homer's "Iliad": The sculptor also was reputed to have immortalised Pantarkes, the winner of the boys' wrestling event at the eighty-sixth Olympiad who was said to have been his "beloved" (), by carving ("Pantarkes is beautiful") into Zeus's little finger, and by placing a relief of the boy crowning himself at the feet of the statue.According to Pausanias, "when the image was quite finished Pheidias prayed.

Statue of Zeus at Olympia. statue perished along with the temple, which was severely damaged by fire in 425 AD. But earlier loss or damage is implied by Lucian of Samosata in the later 2nd century, who referenced it in "Timon": "they have laid hands on your person at Olympia, my lord High-Thunderer, and you had not the energy to wake the dogs or call in the neighbours; surely they might have come to the rescue and caught the fellows before they had finished packing up the loot."## Phidias' workshop.The approximate date of the statue (the third quarter of the 5th century BC) was confirmed.

Statue of Zeus at Olympia. in the rediscovery (1954–1958) of Phidias' workshop, approximately where Pausanias said the statue of Zeus was constructed. Archaeological finds included tools for working gold and ivory, ivory chippings, precious stones and terracotta moulds. Most of the latter were used to create glass plaques, and to form the statue's robe from sheets of glass, naturalistically draped and folded, then gilded. A cup inscribed "ΦΕΙΔΙΟΥ ΕΙΜΙ" or "I belong to Phidias" was found at the site.List of tallest statues"George Washington", 1840 statue Kenneth D. S. Lapatin, "Chryselephantine Statuary in the Ancient Mediterranean World," Oxford University Press (2001) Alfred Mallwitz and Wolfgang Schiering,.

Statue of Zeus at Olympia. "Die Werkstatt des Pheidias in Olympia I: Olympische Forschungen V," Berlin: Walter de Gruyter (1964) Wolfgang Schiering, "Die Werkstatt des Pheidias in Olympia II: Werkstattfunde: Olympische Forschungen XVIII", Berlin: Walter de Gruyter (1991) Janette McWilliam, Rashna Taraporewalla, Tom Stevenson, and Sonia Puttock (Ed.), "The Statue of Zeus at Olympia. New Approaches". Cambridge, Cambridge Scholars Publishing (2011)Barringer, Judith M. 2010. "Zeus at Olympia." In "The gods of ancient Greece: Identities and transformations." Edited by Jan Bremmer and Andrew Erskine, 155–77. Edinburgh: Edinburgh Univ. Press.Boardman, John. 1985. "Greek sculpture: The Classical period." London: Thames & Hudson.Lapatin, Kenneth D. S. 2001. "Chryselephantine statuary.

Statue of Zeus at Olympia. "The colossal Zeus statue of Pheidias" David Fenzl "Recreating Olympic Statuary"History.com: the Seven Wonders.


Question: Which place is this animal endemic to?

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Yellow-bellied slider. The yellow-bellied slider ("Trachemys scripta scripta") is a land and water turtle belonging to the family Emydidae. This subspecies of pond slider is native to the southeastern United States, specifically from Florida to southeastern Virginia, and is the most common turtle species in its range. It is found in a wide variety of habitats, including slow-moving rivers, floodplain swamps, marshes, seasonal wetlands, and permanent ponds. Yellow-bellied sliders are popular as pets.## Description.Adult male yellow-bellied sliders typically reach 5 - 9 (in) in length; females range from 8 - 13 (in). The carapace (upper shell) is typically brown and black, often.

Yellow-bellied slider. may be kept in a fairly small tank (20 to 40 gallons), but as they age, after about three years, they will require much more space. One adult may be housed in a 75 (USgal) or larger aquarium. The turtles require enough water to turn around, with a depth of 16 - 18 (in) recommended. Water temperature should be kept between 72 and 80 °F (22–27 °C) and properly filtered. Keeping fish with turtles is usually avoided due to the risk that the turtle will eat the fish. Sliders need a basking area that is kept warm during the day.


Question: Who is the manufacturer of this equipment?

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Cue stick. of the shaft. While there are many custom cuemakers, a very large number of quality pool cues are manufactured in bulk. In recent years, modern materials such as fiberglass, carbon fiber, aluminum, etc., have been used more and more for shafts and butts. A trend toward experimentation has also developed with rubber, memory foam and other soft .## Carom.Carom billiards cues tend to be shorter and lighter than pool cues, with a shorter ferrule, a thicker and joint, a wooden joint pin (ideally) and collarless wood-to-wood joint, a conical taper, and a smaller tip diameter. Typical dimensions are 54 -.

Cue stick. weight be 16 oz. or 22 oz., the weight change is mainly in the butt (usually in the core, under the wrap). Butts have varying constructions, from three-piece to one-piece, as well as other custom versions that people have developed. These translate into different "feels" because of the distribution of weight as well as the balance point of the cue. Traditionally, players want the balance point of a cue near the top end of the wrap or around 7 inches from where they grip the butt. Some brands and most custom cuemakers offer weights, usually metal discs of 1 to.


Question: Where is the habitat of this plant?

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Acer macrophyllum. and more exceptionally 1200 (m). It can form pure stands on moist soils in proximity to streams, but are generally found within riparian hardwood forests or dispersed, (under or within), relatively open canopies of conifers, mixed evergreens, or oaks ("Quercus" spp.) In cool and moist temperate mixed woods they are one of the dominant species. It is very rare north of Vancouver Island though cultivated in Prince Rupert, near Ketchikan, and in Juneau.## Ecology.The tree can live in a wide range of habitats, but thrives in fairly well-hydrated hardwood forests, occurring with red alder, black cottonwood, and willows. It is.


Question: What is the closest upper taxonomy of this fish?

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Crucian carp. The crucian carp ("Carassius carassius") is a medium-sized member of the common carp family Cyprinidae. It occurs widely in northern European regions. Its name derives from the Low German "karusse" or "karutze", possibly from Medieval Latin "coracinus" (a kind of river fish).## Distribution.The crucian carp is a widely distributed European species, its range spanning from England to Russia; it is found as far north as the Arctic Circle in the Scandinavian countries, and as far south as central France and the region of the Black Sea. Its habitat includes lakes, ponds, and slow-moving rivers. It has been established that the.

Crucian carp. morph is not permanent, it is expected that the trait might have some survivability trade-offs in the absence of predators. Notably, the deep-bodied morph is associated with compromised immune function and resource allocation. Specifically, deep-bodied crucian carp have a lower level of baseline natural antibodies relative to the sleeker-bodied morphs. In addition, crucian carp with the deep-bodied morphology exhibit reduced growth rates when compared to their sleeker-bodied counterparts.## Physiology."Carassius" species exhibit some remarkable physiological adaptations to their environment. For example, in entirely anoxic conditions during winter "Carassius carassius" can survive for considerable periods by anaerobic respiration, with ethanol as the.

Crucian carp. typical crucian specimen of 54 cm, weighing 3 kg has been caught and photographed.## Relation to goldfish.Some sources state that the goldfish ("Carassius auratus") is a cultivated breed of crucian carp taken from the wild.Aside from confusion in nomenclature, there is the practical issue of distinguishing true crucian carp from goldfish hybrids in, e.g., competitive coarse fishing. The following is based on a similar table of guidelines constructed by the Farnham Angling Society:## Use.These carp are also occasionally kept as freshwater aquarium fish, as well as in water gardens, although they are not commonly available commercially, mainly because they are.

Crucian carp. crassius" (read "Carassius" spp.), FAO's 2006 statistics show 5.53 thousand tons harvested, which ranked 13th worldwide among freshwater fishes caught. The breakdown was Kazakhstan 2.2, Japan 1.12, Serbia 0.84, Moldova 0.19, Uzbekistan 0.19, Poland 0.13. In these figures, the tonnage from European countries may represent C. crassius in some part.In Poland, crucian carp () is considered the best-tasting pan fish, and traditionally served with sour cream ("karasie w śmietanie").King's carp (previously Galician carp as in Galicia in the Austro-Hungarian Empire) – the breed of carp created in Poland, the "hump" is bigger than average and the scales are larger than.

Crucian carp. images of "Carassius carassius" at ZipcodeZoo.com. Fish Holds Breath for Months How carp 'hold their breath' through winter - New Scientist.


Question: Who is the discoverer or inventor of this object?

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Thermostat. a mercury thermostat to regulate the temperature of a chicken incubator. This is one of the first recorded feedback-controlled devices.Modern thermostat control was developed in the 1830s by Andrew Ure (1778–1857), a Scottish chemist, who invented the bi-metallic thermostat. The textile mills of the time needed a constant and steady temperature to operate optimally, so to achieve this Ure designed the bimetallic thermostat, which would bend as one of the metals expanded in response to the increased temperature and cut off the energy supply.Warren S. Johnson (1847–1911) of Wisconsin patented a bi-metal room thermostat in 1883, and two years later.

Thermostat. a heating or cooling system via a series of air-filled control tubes. This "control air" system responds to the pressure changes (due to temperature) in the control tube to activate heating or cooling when required. The control air typically is maintained on "mains" at 15-18 psi (although usually operable up to 20 psi). Pneumatic thermostats typically provide output/ branch/ post-restrictor (for single-pipe operation) pressures of 3-15 psi which is piped to the end device (valve/ damper actuator/ pneumatic-electric switch, etc.).The pneumatic thermostat was invented by Warren Johnson in 1895 soon after he invented the electric thermostat. In 2009, Harry Sim.


Question: What is the closest upper taxonomy of this plant?

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Pomelo. The pomelo ( ), "Citrus maxima", is the largest citrus fruit from the family Rutaceae and the principal ancestor of the grapefruit. It is a natural, non-hybrid, citrus fruit, native to Southeast Asia. Similar in taste to a sweet grapefruit, the pomelo is commonly consumed and used for festive occasions throughout Southeast Asia. As with the grapefruit, phytochemicals in the pomelo have the potential for drug interactions.## Etymology and common names.According to the Oxford English Dictionary, the etymology of the word "pomelo" is uncertain. It may be derived from Dutch "pompelmoes". Its botanical name, "Citrus maxima", means "the biggest citrus".

Pomelo. tree they grow on and therefore pomelo is typically grown from seed in Asia. Seeds can be stored for 80 days at a temperature of 41 (F) and with moderate relative humidity. "Citrus maxima" is usually grafted onto other citrus rootstocks outside Asia to produce trees that are identical to the parent; high-quality varieties are propagated by air-layering or by budding onto favored rootstocks.The physical and chemical characteristics of pomelo vary widely across South Asia. Dangyuja Banpeiyu## Varieties.## Hybrids.The pomelo is one of the original citrus species from which cultivated citrus fruits have been hybridized, others being citron, mandarin, and.

Pomelo. artificial breeding programs: The common sweet orange (Citrus × sinensis) is a pomelo × mandarin hybrid The bitter orange (Citrus × aurantium) is another pomelo × mandarin hybrid The tangelo is a hybrid between pomelo or grapefruit and any tangerine; it generally has a thicker skin than a tangerine and is less sweet 'K–Early' ('Sunrise Tangelo') 'Minneola tangelo': Bowen grapefruit × Dancy tangerine 'Orlando' (formerly 'Take'): Bowen grapefruit × Dancy tangerine (pollen parent) 'Seminole': Bowen grapefruit × Dancy tangerine 'Thornton': tangerine × grapefruit, unspecified 'Ugli fruit' (Jamaican tangelo): mandarin × grapefruit, probable (wild seedling) Grapefruit is a pomelo backcross: pomelo.

Pomelo. × sweet orange (see above) Forbidden fruit another Caribbean pomelo/sweet orange cross 'Nova': Clementine × Orlando tangelo cross The Oroblanco and Melogold grapefruits are hybrids between "Citrus maxima" and the grapefruit Mandelos: pomelo × mandarin Mato buntan: a variety in Taiwan Hyuganatsu is a pomelo hybrid Kawachi Bankan: ujukitsu x unidentified## Nutrition.Raw pomelo flesh is 89% water, 10% carbohydrates, 1% protein, and contains negligible fat (table). A 100-gram reference amount provides 159 (kJ) of food energy, and is rich in vitamin C (73% of the Daily Value), with no other micronutrients in significant content (table).## Potential for drug interaction.Pomelo may.


Question: Which building or structure has been replaced by the building in the image?

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Palais de Chaillot. The Palais de Chaillot () is a building at the top of the in the Trocadéro area in the 16th "arrondissement" of Paris, France.For the Exposition Internationale of 1937, the old 1878 Palais du Trocadéro was partly demolished and partly rebuilt to create the Palais de Chaillot. It was designed in classicising "moderne" style by architects Louis-Hippolyte Boileau, Jacques Carlu and Léon Azéma. The Palais consists of two separate wings shaped to form a wide arc, which are those of the former building with new taller portions built in front. The pair of larger central pavilions are also those of.


Question: What is the closest parent taxonomy of this plant?

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Quercus kelloggii. Quercus kelloggii, the California black oak, also known as Kellogg oak, is an oak in the red oak section (genus "Quercus", section "Lobatae", series "Agrifoliae"), native to western North America. Although genetically separated from them for more than 20 million years, its leaves (though not its fruit) are remarkably similar in appearance to several other members of the red oak section including the red oak ("Quercus rubra") and the black oak ("Quercus velutina") found in eastern and central North America.## Description."Quercus kelloggii" typically grows from 9 – 25 (m) in height and from 0.3-1.4 (m) in diameter. Large trees may.

Quercus kelloggii. exceed 36 (m) in height and 1.6 (m) diameter, with the record holder measuring 124 (ft) tall and 2.7 (m) thick (in the Siskiyou National Forest in Oregon). The species also grows in shrubby scrub-oak form on poor sites. In open areas, the crown is broad and rounded, with lower branches nearly touching the ground or forming a browse line. In closed stands, the crown is narrow and slender in young trees and irregularly broad in old trees. Trunks are usually free of branches on the lower 6 – 12 (m) in closed stands. Trunks are often forked, and usually.

Quercus kelloggii. decayed and hollow in older trees. The bark is thin and smooth in young trees, becoming thick, ridged, plate-like, and blackish with age. This oak grows from one to several vertical roots which penetrate to bedrock, with large, laterally spreading roots extending off from vertical ones. It also has a number of surface roots.Acorns are relatively large in this species, from 2.5 – 4 (cm) long and 1.5 - 1.8 (cm) wide. The leaves are typically 10 – 25 (cm) long and deeply lobed, usually into seven portions; they are red and velvety when young, turning yellow-green then orange-brown in.

Quercus kelloggii. autumn. While individual trees generally have a lifespan between 100 and 200 years, California black oak can live up to 500 years.The tree reproduces when its acorns sprout to form seedlings. It also reproduces vegetatively with new growth sprouting from the root crown after the tree is top-killed by wildfire, logging, frost, or other events.## Distribution and habitat.California black oak is a deciduous tree growing in mixed evergreen forests, oak woodlands, and coniferous forests. California black oak is distributed along foothills and lower mountains of California and western Oregon. It can be found at altitudes of up to 1800 (m),.

Quercus kelloggii. for example near Mount Shasta.It is found from Lane County, Oregon, south through the Cascade Range, the Sierra Nevada, and the Coast, Transverse, and Peninsular Ranges to San Diego County, California. The tree occurs in pure or mixed stands. Pure stands usually indicate sites unfavorable to conifer growth or recurring disturbance such as fire or logging activities. The tree can grow in many types of soils, but they must be well-drained.## Ecology.The California black oak is a critical species for wildlife. Oaks ("Quercus" spp.) may be the single most important genus used by wildlife for food and cover in California.

Quercus kelloggii. forests and rangelands, and California black oak occupies more total area in California than any other hardwood species. Livestock also make heavy use of this species for food and cover.Older trees affected by heart rot have cavities which provide den or nest sites for owls, various woodpeckers, tree squirrels, and American black bears. Trees provide valuable shade for livestock and wildlife during the hot summer. California black oak forest types are heavily used for spring, summer, and fall cover by black bears.It is browsed by deer and livestock. Acorns are heavily used by livestock, mule deer, feral pigs, rodents, mountain.

Quercus kelloggii. quail, Steller's jays, and woodpeckers. Acorns constitute an average of 50% of the fall and winter diets of western gray squirrels and black-tailed deer during good mast years. Fawn survival rates increase or decrease with the size of the acorn crop.It is a preferred foraging substrate for many birds. All of 68 bird species observed in oak woodlands of the Tehachapi Mountains of California used California black oak for part of their foraging activities. Acorn woodpecker, Bullock's oriole, and Nashville warbler show strong preferences for California black oak. The parasitic plant Pacific mistletoe ("Phoradendron villosum"), which commonly grows on this.

Quercus kelloggii. oak, produces berries that attract birds, as well.Many animals cache the acorns, and acorns that have been stored in the ground or otherwise buried are more likely to sprout than those that remain on the surface.The tree is adapted to wildfire. It is protected from smaller fires by its thick bark. If it is top-killed and burned away in a larger fire, it easily resprouts and has a good supply of nutrients and water stored in its root system. Acorns sprout into seedlings after fire, and sites that have been cleared of canopy and leaf litter in fires are ideal.

Quercus kelloggii. for seedling success.The tree is less shade tolerant than its associate ponderosa pine. It is vulnerable to sudden oak death.## Allergenicity.The pollen is released in spring and is a severe allergen.## Uses.Some California Native Americans prefer California black oak acorns over those of other species for making acorn meal. Historically, this acorn was a staple food for many Native American groups, who usually leached out the bitter tannin. Native Americans recognized the importance of fire to this oak, and purposely lit fires in oak woodlands to promote its health and ensure their food source.The wood is used for making furniture,.

Quercus kelloggii. pallets, and construction timber. The tree is used as an ornamental.## Timber.California black oak comprises a total volume of 29% of California's hardwood timber resources, and is the major hardwood sawn into lumber there. The total estimated area of species occurrence is 361,800 hectares (3,618 square kilometers or 894,000 acres); 239,200 ha (2,392 km² or 591,000 acres) of timberland and 122,600 ha (1,226 km² or 303,000 acres) of woodland. Of this land 60% is privately owned, 31% is in National Forests, and 9% is on other public lands. It has greatly decreased from its historic abundance. This is due to.

Quercus kelloggii. a number of factors, including drought, disease, animal foraging, logging practices, fire suppression, and a variety of other human impacts. Cutting green trees for fuelwood has contributed to the decline of this species, and illegal harvesting of green trees from public lands is a continuing problem.It was long considered by foresters and government agencies to be a weed tree. In its earlier years, its only use to settlers was to feed the boilers of donkey engines bringing in the valuable pine and fir logs. For a period in the mid-1960s, the U.S. Forest Service policy in California's National Forests was.

Quercus kelloggii. systematic extermination of California black oak by girdling the trees. The objective was to make room for more coniferous growth. In the rush to use the pines, firs, and redwoods, the dense hardwoods were looked on with contempt. Like a few other visionaries in the 1960s, Guy Hall thought the California black oak presented a beautiful challenge that deserved better than eradication. In 1965, Hall convinced federal agencies to cease their extermination policies.Plantations of California black oak have been successfully established in clearcuts from acorn plantings. Thinning such stands promotes stand productivity and wood quality, and is recommended when trees.

Quercus kelloggii. are from 9 – 15 (m) tall or when stand density (basal area) exceeds 29 m2/ha (125 ft2/acre). This tree has also been managed for hardwood production by maintaining scattered pure stands within coniferous forests. Stands of this species often establish on poorer sites, where conifer seedling establishment has not been successful.## Cultivation."Q. kelloggii" is cultivated in the specialty horticulture trade as an ornamental tree for native plant, drought-tolerant, water-conserving, and habitat gardens, and various types of municipal, commercial, and agency sustainable landscape and restoration projects. Black oak (disambiguation) Mediterranean California lower montane black oak–conifer forest – plant association California.

Quercus kelloggii. chaparral and woodlands – ecoregion California montane chaparral and woodlands – subecoregion California interior chaparral and woodlands – subecoregion Hall, G. (1998). "The management, manufacture, marketing of California black oak, Pacific madrone and tanoak: A practical handbook on successful hardwood utilization in California and southern Oregon". Western Hardwood Association. Nupa (Black Oak Acorn) Soup recipe — "from Tuolumne Rancheria". Interactive Map of "Quercus kelloggii" Range Beckman, E. 2016. "Quercus kelloggii". The IUCN Red List of Threatened Species 2016. Downloaded on 19 July 2017.