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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",.


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Pantherophis alleghaniensis. Pantherophis alleghaniensis, commonly called the eastern ratsnake, is a nonvenomous colubrid species endemic to North America.## Common names.Additional common names for the eastern rat snake include black rat snake, pilot snake, pilot black snake, chicken snake; and in Florida, yellow rat snake and Everglades rat snake.## Geographic range."Pantherophis alleghaniensis" is found in the United States east of the Apalachicola River in Florida, east of the Chattahoochee River in Georgia, east of the Appalachian Mountains, north to southeastern New York and western Vermont, eastern Pennsylvania, Maryland, South Carolina, North Carolina, Georgia, south to the Florida Keys. In the Florida Panhandle, it.

Pantherophis alleghaniensis. forests, isolated urban woodlots and backyards that support populations of prey species. Eastern rat snakes do especially well in early successional and edge habitats. An arboreal species, the snakes can get into human residences, where they may live in attics undetected. At the northern limits of their range, distribution appears to be restricted by the availability of suitable hibernating sites. In these climates, the snakes require southern exposures to receive maximal thermal benefit from the winter sun and to provide basking areas in early spring and late fall.The three U.S populations located more northerly (Illinois at 378N, Kansas at 388,Maryland.

Pantherophis alleghaniensis. juveniles.## Taxonomy."Pantherophis alleghaniensis" has sometimes been considered a subspecies of "Pantherophis obsoletus", to which it is closely related.This species has often been placed in the genus "Elaphe", but recent phylogenetic analyses have resulted in its transfer to "Pantherophis".Holbrook JE (1836). "North American Herpetology; or, A Description of the Reptiles Inhabiting the United States. Vol. I." Philadelphia: J. Dobson. 120 pp. ("Coluber alleghaniensis", new species, pp. 111–112 + Plate XX).Jan G, (1867). "Iconographie générale des Ophidiens: Vingt-quatrième livraison." Paris: Baillière. Index + Plates I-VI. ("Elaphis alleghaniensis", Plate II, Figure 1 [adult], Figure 2 [juvenile]). (in French).


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

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Arctia villica. Arctia villica, the cream-spot tiger, is a moth of the family Erebidae. The species was first described by Carl Linnaeus in his 1758 10th edition of "Systema Naturae". It is distributed from the Iberian Peninsula across western and southern Europe, Anatolia, western and northern Iran, western Siberia, southwestern Asia and North Africa.This species, along with the others of the genus "Epicallia", was moved to "Arctia" as a result of phylogenetic research published by Rönkä et al. in 2016.## Description.The wingspan of these moths reaches 45–60 mm. They have black or greyish forewings with white and cream broad patches and spots.

Arctia villica. The bright red/orange hind wings have black spots. The thorax is black and the abdomen is reddish-orange. The highly coloured parts are bright scarlet on a newly emerged insect and tend to dull to orange with age. The caterpillars are black with light brown tufts of hairs, while the head and the legs are reddish. They can reach a length of about 12–12 mm.## Behaviour.The moths are nocturnal and attracted by light, but the females fly also during the day. By day these moths can be found resting on leaves. Moths of this species fly from March to July depending.

Arctia villica. on the location.The caterpillars feed on a variety of herbaceous plants, mainly dandelion ("Taraxacum" species), plantains ("Plantago" species), deadnettles ("Lamium" species), yarrow ("Achillea" species), blackberries ("Rubus" species), nettles ("Urtica" species), knapweeds ("Centaurea" species) and strawberries ("Fragaria" species).They overwinter, but they are relatively sensitive to frost. They can be seen in the spring after hibernation while feeding or seeking for suitable places to pupate. They pupate in May on the ground.## Habitat.This species inhabits woodland, areas with bushes and hedges and sunny open grassy areas."Arctia villica confluens" "Arctia villica villica" "Arctia villica angelica" "Arctia villica fulminans" "Arctia villica marchandi" ## Philately.The.

Arctia villica. cream-spot tiger appeared in 1992 on the German stamp of 100+50 pfennigs.Cream-spot tiger on "Butterflies and Moths of Europa and North Africa""Lepiforum e.V.""De Vlinderstichting.


Question: Where is this plant originally discovered?

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Rye. northern China.Production levels of rye have fallen since 1992 in most of the producing nations, . For instance, production of rye in Russia fell from 13.9 (e6t) in 1992 to 2.4 (e6t) in 2020. Corresponding figures for other countries are as follows: Polandfalling from 4.0 (Mt) in 1992 to 2.9 (Mt) in 2020; Belarusfalling from 3.1 (Mt) in 1992 to 1.1 (Mt) in 2020; Chinafalling from 1.7 (Mt) in 1992 to 0.5 (Mt) in 2020. However, production levels rose in Germany from 2.4 (Mt) in 1992 to 3.5 (Mt) in 2020.World trade of rye is low compared with other grains.


Question: Which significant event was held in this place?

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Blenheim Palace. 1720s. It is unique in its combined use as a family home, mausoleum and national monument. The palace is notable as the birthplace and ancestral home of Sir Winston Churchill.Following the palace's completion, it became the home of the Churchill (later Spencer-Churchill) family for the next 300 years, and various members of the family have wrought changes to the interiors, park and gardens. At the end of the 19th century, the palace was saved from ruin by funds gained from the 9th Duke of Marlborough's marriage to American railroad heiress Consuelo Vanderbilt.## Churchills.John Churchill was born in Devon. Although his.

Blenheim Palace. left (east) side of the plan on either side of the bow room "(marked "O")" can be seen a smaller but nearly identical layout of rooms, which were the suites of the Duke and Duchess themselves. Thus, the bow room corresponds exactly to the saloon in terms of its importance to the two smaller suites.Blenheim Palace was the birthplace of the 1st Duke's famous descendant, Winston Churchill, whose life and times are commemorated by a permanent exhibition in the suite of rooms in which he was born "(marked "K" on the plan)". Blenheim Palace was designed with all its principal.


Question: What country does this building belong to?

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Jameos del Agua. Jameos del Agua is a series of lava caves, located in the municipality of Haría in northern Lanzarote, Canary Islands, Spain. It is also an art, culture and tourism center, created by local artist and architect, César Manrique, and managed by the government of Lanzarote. Jameos del Agua consists of a subterranean salt lake, restaurant, gardens, emerald-green pool, museum and auditorium.## Geological structure.The aboriginal word jameo refers to a large opening in a lava tube, which is formed when parts of the roof collapse. Both Jameos del Agua and Cueva de los Verdes are located inside the volcanic tube, created.


Question: Who designed this bridge?

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Franz Joseph Bridge. Franz Joseph Bridge (), later renamed Štefanik Bridge (), was a suspension bridge over the Vltava in Prague, opened in 1868.The bridge was designed by the English engineer Rowland Mason Ordish. The design, which used the Ordish–Lefeuvre system, was originally created for the Albert Bridge over the River Thames in London. However, after construction of the Albert Bridge was delayed, Ordish decided to build a bridge in Prague first. The foundation stone was laid on 19 October 1865, and engineer František Schön was charged with supervising the construction work. Emperor Franz Joseph, after whom the bridge was named, attended the.


Question: In which year was this building published?

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Bedside. Bedside is a 1934 American pre-Code drama film starring Warren William, Jean Muir and Allen Jenkins. A man passes himself off as a doctor. Warren William as Bob Brown Jean Muir as Caroline Grant Allen Jenkins as Sam Sparks David Landau as Smith Katharine Sergava (Kathryn Sergava) as Mimi Maritza Henry O'Neill as Dr. William Chester Donald Meek as Dr. George Wiley Renee Whitney as Mme. Varsova Walter Walker as Dr. Michaels Marjorie Lytell as Patient with Sprained Ankle Frederick Burton as Hospital Superintendent Philip Faversham as Intern Attending Caroline (as Phillip Faversham) Louise Beavers as Pansy Earle Foxe as.


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

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Airplane. subsequently abandoned work on it.In the 1890s, Lawrence Hargrave conducted research on wing structures and developed a box kite that lifted the weight of a man. His box kite designs were widely adopted. Although he also developed a type of rotary aircraft engine, he did not create and fly a powered fixed-wing aircraft.Between 1867 and 1896, the German pioneer of human aviation Otto Lilienthal developed heavier-than-air flight. He was the first person to make well-documented, repeated, successful gliding flights. Lilienthal's work led to him developing the concept of the modern wing, his flight attempts in 1891 are seen as the.

Airplane. cylinders "radiate" outward from a central crankcase like the spokes of a wheel and was commonly used for aircraft engines before gas turbine engines became predominant. An inline engine is a reciprocating engine with banks of cylinders, one behind another, rather than rows of cylinders, with each bank having any number of cylinders, but rarely more than six, and may be water-cooled. A flat engine is an internal combustion engine with horizontally-opposed cylinders.## Gas turbine.A turboprop gas turbine engine consists of an intake, compressor, combustor, turbine, and a propelling nozzle, which provide power from a shaft through a reduction gearing.

Airplane. resulted in reduced noise from aircraft engines in response to increased noise pollution from growth in air traffic over urban areas near airports.Small planes can be designed and constructed by amateurs as homebuilts. Other homebuilt aircraft can be assembled using pre-manufactured kits of parts that can be assembled into a basic plane and must then be completed by the builder.Few companies produce planes on a large scale. However, the production of a plane for one company is a process that actually involves dozens, or even hundreds, of other companies and plants, that produce the parts that go into the plane.


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

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Nymphaea odorata. Nymphaea odorata, also known as the American white waterlily, fragrant water-lily, beaver root, fragrant white water lily, white water lily, sweet-scented white water lily, and sweet-scented water lily, is an aquatic plant belonging to the genus "Nymphaea". It can commonly be found in shallow lakes, ponds, and permanent slow moving waters throughout North America where it ranges from Central America to northern Canada. It is also reported from Brazil and Guyana.## Description.This plant is rooted from a branched rhizomes which gives rise to long petioles which terminate in smooth floating leaves. Since the leaves are subject to tearing by water.

Nymphaea odorata. and waves, they are round with a waxy upper coating that is water-repellent. The flowers also float. They are radially symmetric with prominent yellow stamens and many white petals. The flowers open each day and close again each night and are very fragrant. Once the flowers are pollinated, the developing fruit is pulled back under water for maturation.Plant systematists often use it as a typical member of Nymphaeaceae, which (other than Amborella) is the most basal of the flowering plants.It is cultivated in aquatic gardens as an ornamental plant.## Chemistry.The lignans nymphaeoside A and icariside E, and the flavonols kaempferol.

Nymphaea odorata. 3-O-alpha-l-rhamnopyranoside (afzelin), quercetin 3-O-alpha-l-rhamnopyranoside (quercitrin), myricetin 3-O-alpha-l-rhamnopyranoside (myricitrin), quercetin 3-O-(6'-O-acetyl)-beta-d-galactopyranoside, myricetin 3-O-beta-d-galactopyranoside and myricetin 3-O-(6'-O-acetyl)-beta-d-galactopyranoside can be found in "N. odorata". "Nymphaea odorata" subsp. "odorata" "Nymphaea odorata" subsp. "tuberosa"## Uses.The fragrant water-lily has both medicinal and edible parts. The seeds, flowers and rhizomes can all be eaten raw or cooked. The root can be boiled to produce a liquid which can be gargled to treat sore throats or drunk to treat diarrhea. The rhizomes were also used by Native Americans to treat coughs and colds. The stem can be placed directly on teeth to treat a toothache.The muck-submerged stems are.

Nymphaea odorata. eaten by muskrats.Jepson Manual Treatment.


Question: What is the conservation status of this fish? (The status is assigned by the international union for conservation of nature. Choose one among Endangered,Least Concern,Critically Endangered,extinct species,extinct in the wild,Vulnerable,Near Threatened,Data Deficient).

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Bonnethead. commercial and recreational fisheries and constitutes up to 50% of all small shark landings in the Eastern US, but is still reasonably abundant there as well as in the Atlantic Coasts of the Bahamas and Mexico. However, significant declines have been reported in the Caribbean Sea and Atlantic Central America and massive declines along with widespread disappearance on the Atlantic Coast of South America as well as most of the shark's Pacific range, leading it to be uplifted to 'Endangered" in 2020.Since October 2021, "S. tiburo" has been classified as Largely Depleted by the IUCN. Species Description of Sphyrna tiburo.


Question: How heavy does this animal typically grow up to in terms of kilogram?

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Aurochs. aurochs was similar in size to the European aurochs in the Pleistocene, but declined in size during the transition to the Holocene; it may have also varied in size geographically.The body mass of aurochs appears to have shown some variability. Some individuals reached around 700 (kg), whereas those from the late Middle Pleistocene are estimated to have weighed up to 1500 (kg). The aurochs exhibited considerable sexual dimorphism in the size of males and females.## Horns.The horns were massive, reaching 80 (cm) in length and between 10 and 20 (cm) in diameter. Its horns grew from the skull at a.


Question: What country does this village belong to?

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Anderton Boat Lift. was re-opened in 2002. The lift and associated visitor centre and exhibition are operated by the Canal & River Trust. It is one of only two working boat lifts in the United Kingdom; the other is the Falkirk Wheel in Scotland.## Economic background.Salt has been extracted from rock salt beds underneath the Cheshire Plain since Roman times. By the end of the 17th century a major salt mining industry had developed around the Cheshire "salt towns" of Northwich, Middlewich, Nantwich and Winsford.Completion of the River Weaver Navigation in 1734 provided a navigable route for transporting salt from Winsford, through Northwich,.

Anderton Boat Lift. Monuments in Cheshire (post-1539) List of waterway societies in the United Kingdom Strépy-Thieu boat lift – the world's second-tallest boat lift, in Le Rœulx, province of Hainaut, Belgium Falkirk Wheel Peterborough lift lock – the world's tallest hydraulic boat lift, in Peterborough, Ontario, Canada Foxton Inclined Plane – former inclined plane on the Grand Union Canal Canals of the United Kingdom Canals in Cheshire Anderton Boat Lift - Canal & River TrustOfficial Website for the trustLiverpool Echo article, 26 March 2002, £7m Lift for 19th century wonderThe Independent, London, 27 March 2002 Uplifting experience as 'Eiffel Tower of waterways' reopensBritish.


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

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Eastern amberwing. The eastern amberwing ("Perithemis tenera") is a species of dragonfly in the family Libellulidae. It is very small, reaching a total length of no more than 25 mm.The males have orange or amber wings. Both sexes have a red pterostigma. The eastern amberwing dragonfly is one of the only types of dragonfly that actively mimics a wasp. The yellow and brown stripes on its abdomen encourage predators to stay away. When perched, they will wiggle their abdomen and wings in a wasp-like fashion to deter other animals from eating it. Males have an elaborate courtship ritual. When a female approaches.

Eastern amberwing. his territory, the male will lead her to his selected egg-laying site and hover above it with wings whirring and abdomen raised.The common name refers to its eastern range, although this dragonfly does extend westward well into the central part of the United States. The scientific name, "tenera", means delicate and alludes to its small size. "Perithemis tenera" on BugGuide.Net.


Question: Which country does this object come from?

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Welsh Corgi. the Pembroke has been attributed to the influx of dogs alongside Flemish weavers from around the 10th century, while the Cardigan is attributed to the dogs brought with Norse settlers, in particular a common ancestor of the Swedish Vallhund. The Pembroke is the more popular of the two, yet still appears on The Kennel Club's vulnerable dog breeds of the United Kingdom list. The Pembroke Welsh Corgi gained in popularity because the Queen has personally owned more than 30 Pembrokes or Corgi-Dachshund crosses, known as dorgis. == History == Pembrokeshire and Cardiganshire are adjoining historical agricultural counties in South West.

Welsh Corgi. to choose whichever they felt was the most appropriate. The first dog to be named Best in Show at an open conformation show was Ch. Bowhit Pivot.Cardigan Welsh Corgis continued to be rarer than Pembrokes, with only 11 registrations made in 1940. Both breeds survived the Second World War, although the Cardigans registered with the Kennel Club numbered only 61 by the end of the war. Pembrokes became very popular during the post war years in the United Kingdom; in 1953 it was ranked as the fourth most popular breed by the Kennel Club, behind the English Cocker Spaniel, the.

Welsh Corgi. Welsh Corgi club was formed in 1937, and the first show was held at Geraldine Rockefeller Dodge's Giralda Farms in New Jersey. Following the Second World War, there were imports from the United Kingdom, including Rozavel Uncle Sam which dominated the show circuit for Corgis. In 1949, he became the first Pembroke winner of Best in Show at an open conformation show in the United States. By 1998, the Pembroke Welsh Corgi had become the 37th most popular breed of dog in the United States. A pair of Cardigan Welsh Corgis were imported to the US in 1931, but the.

Welsh Corgi. led to an increase in popularity for the breed within the United States. A theatrical adaptation took place of Welsh author Roald Dahl's The BFG which toured the UK in 1991 required several different Corgis to perform on stage as those of Queen Elizabeth. The Queen's Corgi is a Belgian animated film depicting the Queen's Corgis. In the anime Cowboy Bebop, the crew has a super-intelligent Pembroke Welsh Corgi, Ein, on their ship.The Top Shelf graphic novel Korgi plays on the folklore tradition of the Corgi as a faerie draft animal. It features the "Mollies" (fairy-like beings) who live in.


Question: What is the street address of this building?

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Schaloen Castle. Schaloen Castle is a castle in Oud-Valkenburg in the South Limburg municipality of Valkenburg aan de Geul in The Netherlands. The castle is a national monument . Together with the Johannes de Doperkerk and Genhoes, it is part of the protected face of Oud Valkenburg. It is also part of the Buitengoed Geul & Maas. ## Location.The castle is located in the meadow of the river Geul near the village of Oud-Valkenburg. The canal around the house is fed with water from the Molenbeek, a Geul branch that formed the main branch of the Geul in the 16th century. The.

Schaloen Castle. castle is located north of the Oud-Valkenburgerweg, the through road from Valkenburg to Schin op Geul.At the end of a driveway, one arrives at a watermill and then, through a gatehouse, on a square where the castle and forecourt are located. The marlstone Schaloensmolen from 1699 was originally a ban mill, but nowadays only serves as a demonstration mill. In the castle garden, the local IVN association has created a Limburg botanical garden, which is open to the public.## Building history.The rectangular castle is built of marl and originally dates from the 12th century. Then it was a bit smaller.

Schaloen Castle. and 1457 the castle was owned by his son Reinier IV van Hulsberg van Schaloen called Sjaloen, according to the archives in Maastricht and Tongeren . His son Librecht van Hulsberg was his successor and after his death in 1530 his brother Johan van Hulsberg was well served. His sonReinier V van Hulsberg van Schaloen became the next lord of the castle. This was succeeded by his brother Gerard van Hulsberg , who acquired the rights to the manor of Oud-Valkenburg in 1605 . The family lived at Huys de Dohm in Welten. During the Spanish-Dutch war in the sixteenth.


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

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Wolf. The wolf (Canis lupus), also known as the gray wolf or grey wolf, is a large canine native to Eurasia and North America. More than thirty subspecies of "Canis lupus" have been recognized, and gray wolves, as popularly understood, comprise wild subspecies. The wolf is the largest extant member of the family Canidae. It is also distinguished from other "Canis" species by its less pointed ears and muzzle, as well as a shorter torso and a longer tail. The wolf is nonetheless related closely enough to smaller "Canis" species, such as the coyote and the golden jackal, to produce fertile.

Wolf. hybrids with them. The banded fur of a wolf is usually mottled white, brown, gray, and black, although subspecies in the arctic region may be nearly all white.Of all members of the genus "Canis", the wolf is most specialized for cooperative game hunting as demonstrated by its physical adaptations to tackling large prey, its more social nature, and its highly advanced expressive behaviour including individual or group howling. It travels in nuclear families consisting of a mated pair accompanied by their offspring. Offspring may leave to form their own packs on the onset of sexual maturity and in response to.

Wolf. and Wolfdregil ("Wolf Runner").## Taxonomy.In 1758, the Swedish botanist and zoologist Carl Linnaeus published in his "Systema Naturae" the binomial nomenclature. "Canis" is the Latin word meaning "dog", and under this genus he listed the doglike carnivores including domestic dogs, wolves, and jackals. He classified the domestic dog as "Canis familiaris", and the wolf as "Canis lupus". Linnaeus considered the dog to be a separate species from the wolf because of its "cauda recurvata" (upturning tail) which is not found in any other canid.## Subspecies.In the third edition of "Mammal Species of the World" published in 2005, the mammalogist W.

Wolf. sister taxa, as modern wolves are not closely related to the population of wolves that was first domesticated. In 2019, a workshop hosted by the IUCN/Species Survival Commission's Canid Specialist Group considered the New Guinea singing dog and the dingo to be feral "Canis familiaris", and therefore should not be assessed for the IUCN Red List.## Evolution.The phylogenetic descent of the extant wolf "C. lupus" from "C. etruscus" through "C. mosbachensis" is widely accepted. The earliest fossils of "C. lupus" were found in what was once eastern Beringia at Old Crow, Yukon, Canada, and at Cripple Creek Sump, Fairbanks, Alaska.


Question: What is the immediately prior item that this building follows in a series?

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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: How many levels does this building have?

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30 St Mary Axe. 30 St Mary Axe (previously known as the Swiss Re Building and informally known as the Gherkin) is a commercial skyscraper in London's primary financial district, the City of London. It was completed in December 2003 and opened in April 2004. With 41 floors, it is 180 (m) tall and stands on the sites of the former Baltic Exchange and Chamber of Shipping, which were extensively damaged in 1992 in the Baltic Exchange bombing by a device placed by the Provisional IRA in St Mary Axe, a narrow street leading north from Leadenhall Street.After plans to build the 92-storey Millennium.


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

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Aqua-Lung. Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or "scuba") to achieve worldwide popularity and commercial success. This class of equipment is now commonly referred to as a twin-hose diving regulator, or demand valve. The Aqua-Lung was invented in France during the winter of 1942–1943 by two Frenchmen: the engineer Émile Gagnan and the Naval Lieutenant (French: "lieutenant de vaisseau") Jacques Cousteau. It allowed Cousteau and Gagnan to film and explore underwater more easily.The invention revolutionised autonomous underwater diving by providing a compact, reliable system capable of a greater depth range and endurance than its precursors, and was a.

Aqua-Lung. Bernard Piel"). One of their apparatuses went to Émile Gagnan, an engineer employed by the Air Liquide company. Gagnan miniaturized and adapted it to gas generators in response to a fuel shortage, which was a consequence of German requisitioning. Gagnan's boss, Henri Melchior, knew that his son-in-law Jacques-Yves Cousteau was looking for an automatic demand regulator to increase the useful endurance of the underwater breathing apparatus invented by Commander Yves le Prieur, so he introduced Cousteau to Gagnan in December 1942. On Cousteau's initiative, the Gagnan regulator was modified for use in diving. Cousteau and Gagnan were issued a patent.

Aqua-Lung. French company.Air Liquide held the patent on the original "Aqualung" (also written as "Aqua-Lung" or "Aqua Lung") until the patent expired sometime around 1960 to 1963. The term "Aqualung", as far as is known, first appeared in print on page 3 of Jacques-Yves Cousteau's first book, "The Silent World", in 1953. Public use of the word "aqualung", and public interest in Aqualungs and scuba diving, were started around 1953 in English-speaking counties by a National Geographical Society Magazine article about Cousteau's underwater archaeological expedition to Grand Congloué. In France, aqualung diving was popularized by Cousteau's movie "Épaves", while his book.


Question: Which location has this animal invaded?

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Wild boar. the tiger and Komodo dragon respectively. The wild boar has a long history of association with humans, having been the ancestor of most domestic pig breeds and a big-game animal for millennia. Boars have also re-hybridized in recent decades with feral pigs; these boar–pig hybrids have become a serious pest wild animal in the Americas and Australia.## Terminology.As true wild boars became extinct in Great Britain before the development of Modern English, the same terms are often used for both true wild boar and pigs, especially large or semi-wild ones. The English "boar" stems from the Old English , which.


Question: Which city or region does this building locate in?

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Marble Church, Bodelwyddan. St Margaret's Church (nicknamed The Marble Church), Bodelwyddan, is a Decorated Gothic Style parish church in the lower Vale of Clwyd in Denbighshire, Wales and is visible for many miles because its spire rises to 202 feet. It lies just off the A55 trunk road.The church was erected by Lady Margaret Willoughby de Broke (daughter of Sir John Williams of nearby Bodelwyddan Castle) in memory of her husband, Henry Peyto-Verney, 16th Baron Willoughby de Broke. She laid the foundation stone on 24 July 1856 and the new church designed by John Gibson was consecrated by the Bishop of St Asaph.

Marble Church, Bodelwyddan. on 23 August 1860 after construction at a cost of £60,000. The new parish of Bodelwyddan was created on 3 August 1860, from the communities of Bodelwyddan, Faenol and Pengwern, which until that date had been part of the parish of St Asaph. When it was first built, it was nicknamed the 'Pearl of the Vale'.The church contains fourteen varieties of marble including pillars made of Belgian Red marble, a nave entrance is made from Anglesey marble and shafts of Languedoc marble on bases of Purbeck marble. It also contains elaborate woodwork, and in the tower can be found windows.

Marble Church, Bodelwyddan. of stained glass on the north and south sides, featuring Saint Margaret and Saint Kentigern. It is a popular tourist destination. The church was designated with Grade II* listed status in November 1962.Until the latter part of the 20th century the church, and in particular its high steeple, was very distinctive because it was so white. With the passage of time, pollution has resulted in the colour becoming more grey, and therefore more like other stone buildings.Local government reorganisation resulted in the church being in Flintshire until 1974, in Clwyd from 1974 until 1996, and since then in Denbighshire.## Churchyard.Immediately.

Marble Church, Bodelwyddan. to the west of the church is Kinmel Camp, which was a military camp located in the grounds of Kinmel Hall. The camp was used by Canadian troops during the First World War. The churchyard contains the graves of numerous victims of the Spanish flu pandemic of 1918–19 in the camp. On 4–5 March 1919 a riot occurred in the camp when the ship allocated to return the troops to Canada was diverted to carry food supplies to Russia. Five Canadian soldiers were killed in the disturbances, four of whom were buried in St Margaret's Churchyard, with the fifth, Gunner.

Marble Church, Bodelwyddan. John Frederick Hickman, being buried in Dorchester, New Brunswick. A common story is that they were executed for mutiny, but this has been denied by the Canadian Department of National Defence.In total there are 112 Commonwealth service personnel commemorated here from World War I. More than 80 of the graves are Canadian, and there are also Special Memorial headstones to 4 British soldiers who were buried at St Peter's Churchyard in Holywell. There are 2 war graves of British servicemen from World War II. Parish websiteArtwork at Marble Church, Bodelwyddan.


Question: Which body of water is this place located in or next to?

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Athirappilly Falls. Athirappilly Falls, is situated in Athirappilly Panchayat in Chalakudy Taluk of Thrissur District in Kerala, India on the Chalakudy River, which originates from the upper reaches of the Western Ghats at the entrance to the Sholayar ranges. It is the largest waterfall in Kerala, which stands tall at 80 feet. Just a short drive from Athirappilly to the Vazhachal falls, which is close to dense green forests that are home to many endangered and endemic species of flora and fauna.There is another waterfall on the way from Athirappilly to Vazhachal Falls, in close proximity to the road, which is locally.

Athirappilly Falls. called "Charpa Falls". Athirappilly Falls is the largest waterfall in Kerala and is nicknamed "The Niagara of South India".Controversy about a state-proposed hydroelectric dam on the Chalakudy River above the waterfalls began in the 1990s and continued through 2017.## River.The 145 (km) long Chalakudy River, originates in the Anaimalai mountains of the Western Ghats and flows through the Vazhachal Forest toward the Arabian Sea. The river starts off smooth but becomes more turbulent as it nears Athirapilly. At Athirappilly Falls, the water surges around big rocks and cascades down in three separate plumes. Below the falls, the river remains turbulent.

Athirappilly Falls. movie "Kaathuvaakula Rendu Kaadhal" (2022) starring Vijay Sethupathi, Nayanthara and Samantha Ruth Prabhu## Hydroelectric project.In 1994, the Kerala State Electricity Board (KSEB) proposed a 163 megawatt Athirappilly Hydro Electric Project. It was to include a dam 23 metres (75 ft) high and 311 metres (1,020 ft) wide on the Chalakudy River in the Vazhachal Forest Division about 5 kilometres (3 mi) upstream of Athirappilly Falls and 400 metres (1,312 ft) upstream of Vazhachal Rapids (Vazhachal Falls). However, environmental groups and people's collectives opposed the project on grounds that it would damage the environment, infringe on human rights, and threaten tourism.

Athirappilly Falls. more environment-friendly power projects with lower operating cost and higher output like super critical boiler plants. Vazhachal Falls Charpa Falls List of waterfalls in India List of waterfalls in India by height Prince Charles, celebrated his 65th birthday in Athirappilly Visiting Athirapilly Waterfalls - What to Know Chalakudy River Protection Forum (CPF) Athirappilly - Vazhachal - Thumboormuzhi - Destination Management Council Official Site: www.thrissur.nic.in Athirappilly Projects Vanishing falls Protests mark hearing on Athirappilly project Salim Ali Foundation.


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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. in the 1st century BC that the statue gave "the impression that if Zeus arose and stood erect he would unroof the temple." The "Zeus" was a chryselephantine sculpture, made with ivory and gold panels on a wooden substructure. No copy in marble or bronze has survived, though there are recognizable but only approximate versions on coins of nearby Elis and on Roman coins and engraved gems.The 2nd-century AD geographer and traveler Pausanias left a detailed description: the statue was crowned with a sculpted wreath of olive sprays and wore a gilded robe made from glass and carved with animals.

Statue of Zeus at Olympia. and lilies. Its right hand held a small chryselephantine statue of crowned Nike, goddess of victory; its left a scepter inlaid with many metals, supporting an eagle. The throne featured painted figures and wrought images and was decorated with gold, precious stones, ebony, and ivory. Zeus' golden sandals rested upon a footstool decorated with an Amazonomachy in relief. The passage underneath the throne was restricted by painted screens.Pausanias also recounts that the statue was kept constantly coated with olive oil to counter the harmful effect on the ivory caused by the "marshiness" of the Altis grove. The floor in front.

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. the god to show by a sign whether the work was to his liking. Immediately, runs the legend, a thunderbolt fell on that part of the floor where down to the present day the bronze jar stood to cover the place."## Loss and destruction.According to Roman historian Suetonius, the Roman Emperor Caligula gave orders that "such statues of the gods as were especially famous for their sanctity or their artistic merit, including that of Jupiter at Olympia, should be brought from Greece, in order to remove their heads and put his own in their place." The emperor was assassinated before.

Statue of Zeus at Olympia. this could happen, in 41 AD; his death was supposedly foretold by the statue, which "suddenly uttered such a peal of laughter that the scaffolding collapsed and the workmen took to their heels."In 391 AD, the Christian Roman emperor Theodosius I banned participation in pagan cults and closed the temples. The sanctuary at Olympia fell into disuse. The circumstances of the statue's eventual destruction are unknown. The 11th-century Byzantine historian Georgios Kedrenos records a tradition that it was carried off to Constantinople, where it was destroyed in the great fire of the Palace of Lausus, in 475 AD. Alternatively, the.

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. in the ancient Mediterranean world." Oxford: Oxford Univ. Press.McWilliam, Janette. 2011. "The statue of Zeus at Olympia in Western imagination via the Internet." In "The statue of Zeus at Olympia: New approaches." Edited by Janette McWilliam, Sonia Puttock, Tom Stevenson, and Rashna Taraporewalla, 209–22. Newcastle, UK: Cambridge Scholars.Palagia, Olga, and J. J. Pollitt, eds. 1996. "Personal styles in Greek sculpture." Cambridge, UK, and New York: Cambridge Univ. Press.World History Encyclopedia - Statue of Zeus at OlympiaColin Delaney, "A Wonder to Behold: The Statue of Olympian Zeus"Archaeopaedia: Statue of Zeus With bibliography(Ellen Papakyriakou) Olympia: Art: the chryselephantine statue of ZeusMichael Lahanas,.


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30 St Mary Axe. loan and the British pound, high interest rates and general financing structure. In November 2014, the Gherkin was purchased for £700 million by the Safra Group, controlled by the Brazilian billionaire Joseph Safra. Landmarks of London Diagrid List of tallest buildings and structures in London Mathematics and architecture Phallic architecture, a list of similarly shaped buildings that includes 30 St Mary Axe Norman Foster's site about the project.


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Wallace Monument. The National Wallace Monument (generally known as the Wallace Monument) is a 67 metre tower on the shoulder of the Abbey Craig, a hilltop overlooking Stirling in Scotland. It commemorates Sir William Wallace, a 13th- and 14th-century Scottish hero.The tower is open to the public for an admission fee. Visitors approach by foot from the base of the crag on which it stands. On entry there are 246 steps to the final observation platform, with three exhibition rooms within the body of the tower. The tower is not accessible to disabled visitors.## Background.The tower was constructed following a fundraising campaign,.

Wallace Monument. architect John Thomas Rochead at a cost of £18,000, the monument is a 67 (m) sandstone tower, built in the Victorian Gothic style.The tower stands on the Abbey Craig, a volcanic crag above Cambuskenneth Abbey, from which Wallace was said to have watched the gathering of the army of King Edward I of England just before the Battle of Stirling Bridge in 1297. The monument is open to the general public. Visitors climb the 246-step spiral staircase to the viewing gallery inside the monument's crown, which provides expansive views of the Ochil Hills and the Forth Valley.A number of artifacts.

Wallace Monument. first heroines to be celebrated in the hall.## Statue of Wallace.The original Victorian statue of Wallace stands on the corner of the monument and is by the Edinburgh sculptor David Watson Stevenson.## "Braveheart" statue.In 1996 Tom Church carved a statue of Wallace called "Freedom", which was inspired by the film "Braveheart". It has the face of Mel Gibson, the actor who played William Wallace in the film. Church leased the statue to Stirling Council, who in 1997 installed it in the car park of the visitor centre at the foot of the craig. The statue was deeply unpopular, being described.

Wallace Monument. decapitated governor of York. In April 2016, it was reported in local press that the statue might be moved to Ardrossan's old Barony Church. In September 2021, it was moved to Glebe Park stadium in Brechin.Statue of William Wallace, AberdeenWallace's Monument, AyrshireStatue of William Wallace, BemersydeWallace's Monument at ElderslieNational Monument of ScotlandIn Stirling's page on the monument.


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Kammerzell House. The Kammerzell House (Alsatian: "Kammerzellhüs", French: "Maison Kammerzell", German: "Kammerzellhaus") is one of the most famous buildings of Strasbourg and one of the most ornate and well preserved medieval civil housing buildings in late Gothic architecture in the areas formerly belonging to the Holy Roman Empire.Built in 1427 but twice transformed in 1467 and 1589, the building as it is now historically belongs to the German Renaissance but is stylistically still attached to the Rhineland black and white timber-framed style of civil (as opposed to administrative, clerical or noble) architecture.It is situated on the "Place de la Cathédrale", north-west of.


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Battersea Power Station. Irish company Real Estate Opportunities (REO), who bought it for £400 million in November 2006 with plans to refurbish the station for public use and build 3,400 homes on the site. This plan fell through due to REO's debt being called in by the state-owned banks of the UK and Ireland. The site was again put up for sale in December 2011 through commercial estate agent Knight Frank. The combination of an existing debt burden of some £750 million, the need to make a £200 million contribution to an extension to the London Underground, requirements to fund conservation of the.

Battersea Power Station. of the Second World War, construction began on the second phase, the B Station. The station came into operation gradually between 1953 and 1955. It was nearly identical to the A Station from the outside and was constructed directly to its east as a mirror to it, which gave the power station its now familiar four-chimney layout. The construction of the B Station brought the site's generating capacity up to 509 megawatts (MW), making it the third largest generating site in the UK at the time, providing a fifth of London's electricity needs (with the remainder supplied by 28 smaller.

Battersea Power Station. stations). It was also the most thermally efficient power station in the world when it opened.The A Station had been operated by the London Power Company, but by the time the B Station was completed, the UK's electric supply industry had been nationalised, and ownership of the two stations had passed into the hands of the British Electricity Authority in 1948.On 20 April 1964, the power station was the site of a fire that caused power failures throughout London, including at the BBC Television Centre, which was due to launch BBC2 that night. The launch was delayed until the following.

Battersea Power Station. Giles Gilbert Scott was involved in the project much later on, consulted to appease public reaction, and referred to in the press as "architect of the exterior". The station was designed in the "brick-cathedral" style of power station design, which was popular at the time. Battersea is one of a very small number of examples of this style of power station design still in existence in the UK, others being Uskmouth and Bankside. The station's design proved popular straightaway, and was described as a "temple of power", which ranked equal with St Paul's Cathedral as a London landmark. In a.

Battersea Power Station. unit consisted of a 66 MW machine associated with a 6 MW house alternator, giving the unit a rating of 72 MW. Combined, these gave the B station a generating capacity of 260 MW, making the site's generating capacity 503 MW. All of the station's boilers were made by Babcock & Wilcox, fuelled by pulverised coal from pulverisers also built by Babcock & Wilcox. There were nine boilers in the A station and six in the B station. The B station's boilers were the largest ever built in the UK at that time. The B station also had the highest.

Battersea Power Station. of the election.Energy in the United KingdomEnergy policy of the United KingdomBankside Power Station## References.FootnotesBibliography Battersea Power Station and Bankside (Tate Modern) compared BBC picture gallery Footage of Battersea Power Station Fire in 1964.


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Lomaria discolor. Lomaria discolor, synonym Blechnum discolor, commonly called crown fern (Māori: piupiu), is a species of fern in the family Blechnaceae. This species is endemic to New Zealand. As noted by C. Michael Hogan, this species is found in a number of forest communities in diverse locations within New Zealand, and is sometimes a dominant understory component.Spores are produced on specialised fronds. These are more erect, with a dark and shrivelled look. C. Michael Hogan. 2009. "Crown Fern: Blechnum discolor", Globaltwitcher.com, ed. N. Stromberg Primitive Plants. 2009. "True Ferns.


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Cranny. Cranny () is a small village in County Clare, Ireland.## Location.Cranny lies on the banks of the Cloon River, which flows into the estuary of the River Shannon at Clonderlaw Bay.## Facilities.There is a local Gaelic Athletic Association club, Coolmeen GAA, founded in 1887 three years after the association came together. Coolmeen GAA succeeded in the Clare Senior Football Championship in 1919 and 1921, in the Clare Intermediate Football Championship in 1959, 1966 and 1967 and in the Clare Junior A Football Championship in 1958, 1964, 1983 and 1999. The parish also has a national school. The Cranny N.S. is.

Cranny. a co-educational catholic primary school Peadar Clancy List of towns and villages in Ireland.


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Sumburgh Head. Sumburgh Head is a headland located at the southern tip of the Shetland Mainland in northern Scotland. The head consists of a 100 m high rocky spur and topped by the Sumburgh Head Lighthouse. In the Old Norse language, Sumburgh Head was called "Dunrøstar høfdi", it means "The Head onto the loud tide-race", referring to the noise of Sumburgh Roost. Robert Stevenson was the engineer in charge of building the Sumburgh Head lighthouse. Work started on the building in 1819, and the light was first lit in 1821.## Local ecology.The area is now recognized as a nature reserve by the.

Sumburgh Head. Royal Society for the Protection of Birds. The cliffs are home to large numbers of seabirds with 33,000 puffins being estimated in the year 2000. These numbers have declined sharply: for example only 570 of the birds were counted in 2017. The decline in Puffin numbers also appears to apply to other species native to Sumburgh Head. In as birds, Sumburgh Head has become a popular viewing point for whales and dolphins.## Nearby locations.Sumburgh Airport, which takes its name from the head, lies immediately to the north, and serves as the main airport for the Shetland Islands. Flights from here.

Sumburgh Head. connect to mainland Scotland, the Orkney Islands and Norway. Also close to the Sumburgh Head is the archaeological site of Jarlshof, at which a series of settlements existed dating back to the neolithic period. The tiny settlement of Grutness, which is the terminus of the Shetland Mainland to Fair Isle ferry service, lies 1 (mi) north of Sumburgh Head. Images from around Sumburgh.


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Calocedrus decurrens. Calocedrus decurrens, with the common names incense cedar and California incense-cedar (syn. "Libocedrus decurrens" Torr.), is a species of coniferous tree native to western North America. It is the most widely known species in the genus, and is often simply called 'incense cedar' without the regional qualifier.## Description."Calocedrus decurrens" is a large tree, typically reaching heights of 30-40 (m) and a trunk diameter of up to 1.2 (m). The largest known tree, located in Klamath National Forest, Siskiyou County, California, is 47.98 (m) tall with a 12 (m) circumference trunk and a 17.5 (m) spread. Specimens form a broad conic.

Calocedrus decurrens. crown of spreading branches. The bark is orange-brown weathering grayish, smooth at first, becoming fissured and exfoliating in long strips on the lower trunk on old trees. Specimens can live to over 500 years old.The foliage is produced in flattened sprays with scale-like leaves 2–15 (mm) long; they are arranged in opposite decussate pairs, with the successive pairs closely then distantly spaced, so forming apparent whorls of four; the facial pairs are flat, with the lateral pairs folded over their bases. The leaves are bright green on both sides of the shoots, with only inconspicuous stomata. The foliage, when crushed,.

Calocedrus decurrens. gives off an aroma somewhat akin to shoe-polish.The seed cones are 20–35 (mm) long, pale green to yellow, with four (rarely six) scales arranged in opposite decussate pairs; the outer pair of scales each bears two winged seeds, the inner pair(s) usually being sterile and fused together in a flat plate. The cones turn orange to yellow-brown when mature about 8 months after pollination. The pollen cones are 6–8 (mm) long.## Distribution.The bulk of the tree's range is in the United States, from central-southwestern Oregon through most of California and the extreme west of Nevada, as well as a short.

Calocedrus decurrens. distance into northwest Mexico in northern Baja California.It grows at altitudes of 50-2900 (m).## Ecology.At lower elevations, associated trees include oaks and ponderosa pine. Giant sequoia bears similarities to the species, but has sharp leaves. In the south–southwest U.S. some have confused bushy junipers for incense cedar.With its thick basal bark, the incense cedar is one of the most fire- and drought-tolerant plants in California. Although the tree is killed by hot, stand-replacing crown fire, it spreads rapidly after lower-intensity burns. This has given the incense cedar a competitive advantage over other species such as the bigcone Douglas-fir in recent.

Calocedrus decurrens. years. Incense cedar is more shade tolerant than Douglas-fir, but not as much so as grand or white fir. It grows slowly when needed to outlast competition.This tree is the preferred host of a wood wasp, "Syntexis libocedrii" a species which lays its eggs in the smoldering wood immediately after a forest fire. The tree is also host to incense-cedar mistletoe ("Phoradendron libocedri"), a parasitic plant which can often be found hanging from its branches. Fire scars provide an entry point for "Tyromyces amarus" (pocket dry rot). "Gymnosporangium" rust disease afflicts the trees, but is rarely fatal.For numerous birds during.

Calocedrus decurrens. the wintertime, "Calocedrus decurrens" has been seen to be used for foraging. According to the United States Department of Agriculture, in areas of the Western Sierra Nevada in California, numerous species of birds are thought to use the incense cedar as a "foraging substrate" so that they can attain as much food as needed. Human impacts on these trees due to forest management practices have caused issues for many of these birds, threatening the use of the incense cedar as a forage substrate.## Uses.The wood is soft and light, and has a pleasant odor and is generally resistant to rot.

Calocedrus decurrens. It has been used for external house siding, interior paneling, and to make moth-resistant hope chests. It was once the primary material for wooden pencils, because it is soft and tends to sharpen easily without forming splinters.## Native Americans.Indigenous peoples of California use the plant in traditional medicine, basket making, hunting bows, building materials, and to produce fire by friction. A Northern California tribe used branchlets to filter out sand from water when leaching toxins from acorn meal; foliage also served as a flavoring.The Maidu Concow tribe name for the plant is hö'-tä (Konkow language).## Cultivation."Calocedrus decurrens" is cultivated as.

Calocedrus decurrens. an ornamental tree, for planting in gardens and parks. It is used in traditional, xeriscapic, native plant, and wildlife gardens; and also in designed natural landscaping and habitat restoration projects in California. It is valued for its columnar form and evergreen foliage textures.The tree is also grown in gardens and parks in cool summer climates, including the Pacific Northwest in the Northwestern United States and British Columbia, eastern Great Britain and continental Northern Europe. In these areas it can develop an especially narrow columnar crown, an unexplained consequence of the cooler climatic conditions that is rare in trees within its.

Calocedrus decurrens. warm summer natural range in the California Floristic Province. Other cultivated species from the family Cupressaceae can have similar crown forms.## Award of Garden Merit.This plant has gained the Royal Horticultural Society's Award of Garden Merit, and has the cultivar 'Berrima Gold'.## Essential oils.Various species in the family Cupressaceae can be utilized for the creation of essential oils. Scientific studies have shown that these essential oils have "strong antimicrobial properties." Antimicrobial properties are those properties of a substance that lower the levels of microbes, such as bacteria and viruses. These antimicrobial properties could potentially be used for therapies in developing.

Calocedrus decurrens. countries, although more testing and clinical trials should be done before such measures are implemented. Cedar wood List of California native plants.