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93-640: One can find a windmill , at the corner of Notre-Dame Street and Third Avenue, which was built in 1719. Its three storeys make it the tallest windmill in Québec that still stands. In 1650 the Grou family of Rouen France established a land holding here. The Commission scolaire de la Pointe-de-l'Île (CSPI) operates Francophone schools in this area. The district's headquarters is in Pointe-aux-Trembles. The École secondaire Pointe-aux-Trembles and

186-609: A fierce hatred for each other. During Hisham ibn Abd al-Malik 's reign, the Umayyad government appointed Mudaris as governors in Khorasan, except for Asad ibn Abdallah al-Qasri's tenure in 735–738. Nasr's appointment came four months after Asad's death. In the interim, the sources report variously that the province was run either by the Syrian general Ja'far ibn Hanzala al-Bahrani or by Asad's lieutenant Juday' al-Kirmani. At any rate,

279-549: A frontier region between Khorasan and Hindustan . By the late Middle Ages, the term lost its administrative significance, in the west only being loosely applied among the Turko-Persian dynasties of modern Iran to all its territories that lay east and north-east of the Dasht-e Kavir desert. It was therefore subjected to constant change, as the size of their empires changed. In the east, Khwarasan likewise became

372-489: A hollow-post mill, the post on which the body is mounted is hollowed out, to accommodate the drive shaft. This makes it possible to drive machinery below or outside the body while still being able to rotate the body into the wind. Hollow-post mills driving scoop wheels were used in the Netherlands to drain wetlands since the early 15th century onwards. By the end of the 13th century, the masonry tower mill, on which only

465-554: A horizontal plane, around a vertical axis. Made of six to 12 sails covered in reed matting or cloth material, these windmills were used to grind grain or draw up water. A medieval account reports that windmill technology was used in Persia and the Middle East during the reign of Rashidun caliph Umar ibn al-Khattab ( r.  634–644 ), based on the caliph's conversation with a Persian builder slave. The authenticity of part of

558-687: A huge waste problem in Denmark and countries Denmark, to a greater and greater extent, export its many produced wind turbines. " The reason why many wings end up in landfill is that they are incredibly difficult to separate from each other, which you will have to do if you hope to be able to recycle the fiberglass ", says Lykke Margot Ricard, Associate Professor in Innovation and Technological Foresight and education leader for civil engineering in Product Development and Innovation at

651-410: A hypothetical Proto-Iranian form *miθrāsāna ; see Mithra , Bactrian μιυρο [mihr], for the relevant solar deity ). The province was often subdivided into four quarters, such that Nishapur (present-day Iran), Marv (present-day Turkmenistan ), Herat and Balkh (present-day Afghanistan) were the centers, respectively, of the westernmost, northernmost, central, and easternmost quarters. Khorasan

744-539: A landfill at Gerringe in the middle of Lolland in 2020. In the United States , worn-out wind turbine blades made of fiberglass go to the handful of landfills that accept them (e.g., in Lake Mills , Iowa; Sioux Falls , South Dakota; Casper ). Windpumps were used to pump water since at least the 9th century in what is now Afghanistan , Iran , and Pakistan . The use of windpumps became widespread across

837-566: A single major city: Nishapur, Merv, Herat and Balkh. By the 10th century, Ibn Khordadbeh and the Hudud al-'Alam mentions what roughly encompasses the previous regions of Abarshahr , Tokharistan and Sogdia as Khwarasan proper. They further report the southern part of the Hindu Kush, i.e. the regions of Sistan , Rukhkhudh , Zabulistan and Kabul etc. to make up the Khorasan marches ,

930-407: A small turbine in the back that helped the main mill to face the direction of the wind. Common sails consist of a lattice framework on which the sailcloth is spread. The miller can adjust the amount of cloth spread according to the wind and the power needed. In medieval mills, the sailcloth was wound in and out of a ladder-type arrangement of sails. Later mill sails had a lattice framework over which

1023-706: A term associated with the great urban centers of Central Asia. It is mentioned in the Memoirs of Babur (from the 1580s) that: The people of Hindustān call every country beyond their own Khorasān, in the same manner as the Arabs term all except Arabia, Ajem . On the road between Hindustān and Khorasān, there are two great marts: the one Kābul, the other Kandahār . Caravans, from Ferghāna, Tūrkestān, Samarkand, Balkh, Bokhāra, Hissār, and Badakhshān , all resort to Kābul; while those from Khorasān repair to Kandahār . This country lies between Hindustān and Khorasān. In modern times,

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1116-723: A vast and loosely defined region of Khorasan, which might even extend to the Indus Valley and the Pamir Mountains. The boundary between these two was the region surrounding the cities of Gurgan and Qumis . In particular, the Ghaznavids , Seljuqs and Timurids divided their empires into Iraqi and Khorasani regions. Khorasan is believed to have been bounded in the southwest by desert and the town of Tabas , known as "the Gate of Khorasan", from which it extended eastward to

1209-468: A wind-powered organ is not a practical windmill but was either an early wind-powered toy or a design concept for a wind-powered machine that may or may not have been a working device, as there is ambiguity in the text and issues with the design. Another early example of a wind-driven wheel was the prayer wheel , which is believed to have been first used in Tibet and China , though there is uncertainty over

1302-479: Is a development of the 12th century, first used in northwestern Europe, in the triangle of northern France , eastern England and Flanders . It is unclear whether the vertical windmill was influenced by the introduction of the horizontal windmill from Persia-Middle East to Southern Europe in the preceding century. The earliest certain reference to a windmill in Northern Europe (assumed to have been of

1395-517: Is a historical eastern region in the Iranian Plateau in West and Central Asia that encompasses western and northern Afghanistan , northeastern Iran , the eastern halves of Turkmenistan and Uzbekistan , western Tajikistan , and portions of Kyrgyzstan and Kazakhstan . The extent of the region referred to as Khorasan varied over time. In its stricter historical sense, it comprised

1488-519: Is a windmill-like structure specifically developed to generate electricity. They can be seen as the next step in the development of the windmill. The first wind turbines were built by the end of the nineteenth century by James Blyth in Scotland (1887), Charles F. Brush in Cleveland, Ohio (1887–1888) and Poul la Cour in Denmark (1890s). La Cour's mill from 1896 later became the local power of

1581-559: Is possibly the forerunner of the Sasanian administrative division of Khurasan, occurring after their takeover of Hephthalite territories south of the Oxus. The transformation of the term and its identification with a larger region is thus a development of the late Sasanian and early Islamic periods. Early Islamic usage often regarded everywhere east of Jibal or what was subsequently termed Iraq Ajami (Persian Iraq) , as being included in

1674-590: The École secondaire Daniel-Johnson are both within the community. Primary schools: The English Montreal School Board (EMSB) operates Anglophone schools serving the area. The community is served by the Pointe-aux-Trembles branch of the Montreal Public Libraries Network . Windmill A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain ( gristmills ), but in some parts of

1767-754: The Battle of the Oxus River . The next year, Ibn Amir concluded a peace treaty with Kanadbak , an Iranian nobleman and the kanarang of Tus . The Sasanian rebel Burzin Shah , of the Karen family , revolted against Ibn Amir, though the latter crushed the rebels in the Battle of Nishapur . After the invasion of Persia under Rashidun was completed in five years and almost all of the Persian territories came under Arab control, it also inevitable created new problems for

1860-878: The Cape Colony in the seventeenth century. The early tower mills did not survive the gales of the Cape Peninsula , so in 1717 the Heeren XVII sent carpenters, masons, and materials to construct a durable mill. The mill, completed in 1718, became known as the Oude Molen and was located between Pinelands Station and the Black River. Long since demolished, its name lives on as that of a Technical school in Pinelands . By 1863, Cape Town had 11 mills stretching from Paarden Eiland to Mowbray . A wind turbine

1953-776: The Enercon E-126 capable of delivering up to 7 MW, while wind turbine production has expanded to many countries. As the 21st century began, rising concerns over energy security , global warming , and eventual fossil fuel depletion led to an expansion of interest in all available forms of renewable energy . Worldwide, many thousands of wind turbines are now operating, with a total nameplate capacity of 591 GW as of 2018. In an attempt to make wind turbines more efficient and increase their energy output, they are being built bigger, with taller towers and longer blades, and being increasingly deployed in offshore locations. While such changes increase their power output, they subject

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2046-589: The Ghilji Pashtuns from Kandahar and became part of the Hotaki dynasty from 1722 to 1729. Nader Shah recaptured Khorasan in 1729 and chose Mashhad as the capital of Persia. Following his assassination in 1747, the eastern parts of Khorasan, including Herat were annexed with the Durrani Empire . Mashhad area was under control of Nader Shah's grandson Shahrukh Afshar until it was captured by

2139-525: The Mongol subjugation of Khorasan, carrying out the task "with a thoroughness from which that region has never recovered." Throughout the nineteenth and twentieth century, the majority of Islamic archaeological efforts were focused on the medieval era, predominantly in areas near what is today Central Asia . Under Caliph Umar ( r.  634–644 ), the Rashidun Caliphate seized nearly

2232-624: The Muslim world and later spread to East Asia ( China ) and South Asia ( India ). Windmills were later used extensively in Europe, particularly in the Netherlands and the East Anglia area of Great Britain , from the late Middle Ages onwards, to drain land for agricultural or building purposes. The "American windmill", or "wind engine", was invented by Daniel Halladay in 1854 and

2325-547: The Pamir Mountains . Greater Khorasan is today sometimes used to distinguish the larger historical region from the former Khorasan Province of Iran (1906–2004), which roughly encompassed the western portion of the historical Greater Khorasan. The name Khorāsān is Persian (from Middle Persian Xwarāsān , sp. xwlʾsʾn' , meaning "where the sun arrives from" or "the Eastern Province"). The name

2418-863: The Qajar dynasty in 1796. In 1856, the Iranians, under the Qajar dynasty, briefly recaptured Herat; by the Treaty of Paris of 1857 , signed between Iran and the British Empire to end the Anglo-Persian War , the Iranian troops withdrew from Herat . Later, in 1881, Iran relinquished its claims to a part of the northern areas of Khorasan to the Russian Empire , principally comprising Merv , by

2511-617: The Treaty of Akhal (also known as the Treaty of Akhal-Khorasan ). Khorasan has had a great cultural importance among other regions in Greater Iran . The literary New Persian language developed in Khorasan and Transoxiana and gradually supplanted the Parthian language . The New Persian literature arose and flourished in Khorasan and Transoxiana where the early Iranian dynasties such as Tahirids , Samanids , Saffirids and Ghaznavids (a Turco-Persian dynasty) were based. Until

2604-626: The University of Southern Denmark (SDU). According to Dakofa, the Danish Competence Center for Waste and Resources, there is nothing specific in the Danish waste order about how to handle discarded fiberglass. Several scrap dealers tell Ingeniøren that they have handled wind turbine blades (wings) that have been pulverized after being taken to a recycling station. One of them is the recycling company H.J. Hansen, where

2697-619: The mountains of central Afghanistan . Sources from the 10th century onwards refer to areas in the south of the Hindu Kush as the Khorasan Marches, forming a frontier region between Khorasan and Hindustan . First established in the 6th century as one of four administrative (military) divisions by the Sasanian Empire , the scope of the region has varied considerably during its nearly 1,500-year history. Initially,

2790-474: The product manager informed, that they have transported approximately half of the wings they have received since 2012 to Reno Nord's landfill in Aalborg. A total of around 1,000 wings have ended up there, he estimates - and today up to 99 percent of the wings the company receives end up in a landfill. Since 1996, according to an estimate made by Lykke Margot Ricard ( SDU ) in 2020, at least 8,810 tonnes of

2883-571: The wind turbine design technologies in use today, including steel tube towers, variable-speed generators, composite blade materials, and partial-span pitch control, as well as aerodynamic, structural, and acoustic engineering design capabilities. The modern wind power industry began in 1979 with the serial production of wind turbines by Danish manufacturers Kuriant, Vestas , Nordtank , and Bonus . These early turbines were small by today's standards, with capacities of 20–30 kW each. Since then, commercial turbines have increased greatly in size, with

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2976-403: The 12th century. Regarded as an icon of Dutch culture , there are approximately 1,000 windmills in the Netherlands today. Wind-powered machines may have been known earlier, but there is no clear evidence of windmills before the 9th century. Hero of Alexandria (Heron) in first-century Roman Egypt described what appears to be a wind-driven wheel to power a machine. His description of

3069-528: The 18th and nineteenth centuries, for example Fowler's Mill at Battersea in London, and Hooper's Mill at Margate in Kent . These early modern examples seem not to have been directly influenced by the vertical-axle windmills of the medieval period, but to have been independent inventions by 18th-century engineers. The horizontal-axis or vertical windmill (so called due to the plane of the movement of its sails)

3162-476: The Dutch in the 17th century to overcome the limitations of tower windmills, which were expensive to build and could not be erected on wet surfaces. The lower half of the smock windmill was made of brick, while the upper half was made of wood, with a sloping tower shape that added structural strength to the design. This made them lightweight and able to be erected on unstable ground. The smock windmill design included

3255-402: The Dutch victims of the 2014 Malaysian Airlines Flight 17 shootdown . Gears inside a windmill convey power from the rotary motion of the sails to a mechanical device. The sails are carried on the horizontal windshaft. Windshafts can be wholly made of wood, wood with a cast iron pole end (where the sails are mounted), or entirely of cast iron. The brake wheel is fitted onto the windshaft between

3348-506: The English-speaking world, the term has also been extended to encompass windpumps , wind turbines , and other applications. The term wind engine is also sometimes used to describe such devices. Windmills were used throughout the high medieval and early modern periods ; the horizontal or panemone windmill first appeared in Persia during the 9th century, and the vertical windmill first appeared in northwestern Europe in

3441-777: The Griffiths Brothers at Toowoomba manufactured windmills of the American pattern from 1876, with the trade name Southern Cross Windmills in use from 1903. These became an icon of the Australian rural sector by utilizing the water of the Great Artesian Basin . Another well-known maker was Metters Ltd. of Adelaide , Perth and Sydney . Greater Khorasan Greater Khorasan ( Middle Persian : 𐬒𐬊𐬭𐬀𐬯𐬀𐬥 , romanized:  Xwarāsān ; Persian : خراسان , [xoɾɒːˈsɒːn] )

3534-558: The Khorasan division of the Sasanian Empire covered the northeastern military gains of the empire, at its height including cities such as Nishapur , Herat , Merv , Faryab , Taloqan , Balkh , Bukhara , Badghis , Abiward , Gharjistan , Tus and Sarakhs . With the rise of the Umayyad Caliphate , the designation was inherited and likewise stretched as far as their military gains in the east, starting off with

3627-573: The Mediterranean Sea, tower mills with fixed caps were built because the wind's direction varied little most of the time. The smock mill is a later development of the tower mill, where the masonry tower is replaced by a wooden framework, called the "smock", which is thatched, boarded, or covered by other materials, such as slate , sheet metal , or tar paper . The smock is commonly of octagonal plan, though there are examples with different numbers of sides. Smock windmills were introduced by

3720-512: The United States, Canada, Southern Africa, and Australia. They feature a large number of blades, so they turn slowly with considerable torque in low winds and are self-regulating in high winds. A tower-top gearbox and crankshaft convert the rotary motion into reciprocating strokes carried downward through a rod to the pump cylinder below. Such mills pumped water and powered feed mills, sawmills, and agricultural machinery. In Australia,

3813-682: The WIME-3D in service in Balaklava , USSR , from 1931 until 1942, a 100 kW generator on a 30-metre (98 ft) tower, the Smith–Putnam wind turbine built in 1941 on the mountain known as Grandpa's Knob in Castleton, Vermont , United States, of 1.25 MW, and the NASA wind turbines developed from 1974 through the mid-1980s. The development of these 13 experimental wind turbines pioneered many of

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3906-425: The advantage of being able to run with a damaged sail by removing both the damaged sail and the one opposite, which does not unbalance the mill. In the Netherlands, the stationary position of the sails, i.e. when the mill is not working, has long been used to give signals. If the blades are stopped in a "+" sign (3-6-9-12 o'clock), the windmill is open for business. When the blades are stopped in an "X" configuration,

3999-413: The anecdote involving the caliph Umar is questioned because it was recorded only in the 10th century. The Persian geographer Estakhri reported windmills being operated in Khorasan (Eastern Iran and Western Afghanistan) already in the 9th century. Such windmills were in widespread use across the Middle East and Central Asia and later spread to Europe, China, and India from there. By the 11th century,

4092-440: The blade, and together, the system of the webs and spars resist the flapwise loading. Flapwise loading, one of the two different types of loading that blades are subject to, is caused by the wind pressure, and edgewise loading (the second type of loading) is caused by the gravitational force and torque load. The former loading subjects the spar laminate on the pressure (upwind) side of the blade to cyclic tension-tension loading, while

4185-574: The caliphate. Pockets of tribal resistance continued for centuries in the Afghan territories. During the 7th century, Arab armies made their way into the region of Afghanistan from Khorasan. A second problem was as a corollary to the Muslim conquest of Persia, the Muslims became neighbors of the city states of Transoxiana . Although Transoxiana was included in the loosely defined "Turkestan" region, only

4278-500: The cap is rotated rather than the whole body of the mill, had been introduced. The spread of tower mills came with a growing economy that called for larger and more stable sources of power, though they were more expensive to build. In contrast to the post mill, only the cap of the tower mill needs to be turned into the wind, so the main structure can be made much taller, allowing the sails to be made longer, which enables them to provide useful work even in low winds. The cap can be turned into

4371-407: The components must be chosen appropriately. The blade of a wind turbine consists of 4 main elements: the root, spar, aerodynamic fairing, and surfacing. The fairing is composed of two shells (one on the pressure side, and one on the suction side), connected by one or more webs linking the upper and lower shells. The webs connect to the spar laminates, which are enclosed within the skins (surfacing) of

4464-401: The components of the windmills to stronger forces and consequently put them at a greater risk of failure. Taller towers and longer blades suffer from higher fatigue, and offshore windfarms are subject to greater forces due to higher wind speeds and accelerated corrosion due to the proximity to seawater. To ensure a long enough lifetime to make the return on the investment viable, the materials for

4557-552: The date of its first appearance, which could have been either c.  400 , the 7th century, or after the 9th century. One of the earliest recorded working windmill designs found was invented sometime around 700–900 AD in Persia . This design was the panemone, with vertical lightweight wooden sails attached by horizontal struts to a central vertical shaft. It was first built to pump water and subsequently modified to grind grain as well. The first practical windmills were panemone windmills , using sails that rotated in

4650-662: The devastating Mongol invasion of the 13th century, Khorasan remained the cultural capital of Persia. It has produced scientists such as Avicenna , Al-Farabi , Al-Biruni , Omar Khayyam , Al-Khwarizmi , Abu Ma'shar al-Balkhi (known as Albumasar or Albuxar in the west), Alfraganus , Abu Wafa , Nasir al-Din al-Tusi , Sharaf al-Dīn al-Ṭūsī , and many others who are widely well known for their significant contributions in various domains such as mathematics, astronomy , medicine, physics , geography , and geology. There have been many archaeological sites throughout Khorasan, however many of these expeditions were illegal or committed in

4743-634: The development of the airplane led to further improvements in efficiency by German engineer Bilau and several Dutch millwrights. The majority of windmills have four sails. Multiple-sailed mills, with five, six, or eight sails, were built in Great Britain (especially in and around the counties of Lincolnshire and Yorkshire ), Germany, and less commonly elsewhere. Earlier multiple-sailed mills are found in Spain, Portugal, Greece, parts of Romania, Bulgaria, and Russia. A mill with an even number of sails has

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4836-456: The drainage mills have been appointed as a backup to the modern pumping stations. The Zaan district has been said to have been the first industrialized region of the world with around 600 operating wind-powered industries by the end of the eighteenth century. Economic fluctuations and the industrial revolution had a much greater impact on these industries than on grain and drainage mills, so only very few are left. Construction of mills spread to

4929-424: The early days of the Muslim conquests , Arab armies were divided into regiments drawn from individual tribes or tribal confederations ( butun or ‘asha‘ir ). Despite the fact that many of these groupings were recent creations, created for reasons of military efficiency rather than any common ancestry, they soon developed a strong and distinct identity. By the beginning of the Umayyad period, this system progressed to

5022-537: The entire Persia from the Sasanian Empire . However, the areas of Khorasan weren't conquered until c.  651 during the caliphate of Uthman ( r.  644–656 ). The Rashidun commanders Ahnaf ibn Qays and Abd Allah ibn Amir were assigned to lead the invasion of Khorasan. In late 651, the Rashidun army defeated the combined forces of the Sasanian and the First Turkic Khaganate in

5115-446: The eventual conquest. In July 738, at the age of 74, Nasr was appointed as governor of Khorasan. Despite his age, he was widely respected both for his military record, his knowledge of the affairs of Khorasan and his abilities as a statesman. Julius Wellhausen wrote of him that "His age did not affect the freshness of his mind, as is testified not only by his deeds, but also by the verses in which he gave expression to his feelings till

5208-555: The formation of ever-larger super-groupings, culminating in the two super-groups : the northern Arab Mudaris or Qaysis , and the south Arabs or "Yemenis" ( Yaman ), dominated by the Azd and Rabi'ah tribes. By the 8th century, this division had become firmly established across the Caliphate and was a source of constant internal instability, as the two groups formed in essence two rival political parties, jockeying for power and separated by

5301-407: The front and rear bearings. It has the brake around the outside of the rim and teeth in the side of the rim which drives the horizontal gearwheel called wallower on the top end of the vertical upright shaft. In grist mills , the great spur wheel, lower down the upright shaft, drives one or more stone nuts on the shafts driving each millstone . Post mills sometimes have a head and/or tail wheel driving

5394-469: The late 19th century, steel blades and towers replaced wooden construction. At their peak in 1930, an estimated 600,000 units were in use. Firms such as U.S. Wind Engine and Pump Company, Challenge Wind Mill and Feed Mill Company, Appleton Manufacturing Company, Star, Eclipse , Fairbanks-Morse , Dempster Mill Manufacturing Company , and Aermotor became the main suppliers in North and South America. These windpumps are used extensively on farms and ranches in

5487-419: The major portion of Khorasān, as two of the four main capitals of Khorasān (Herat and Balkh) are now located in Afghanistan. Ghobar uses the terms "Proper Khorasan" and " Improper Khorasan" in his book to distinguish between the usage of Khorasān in its strict sense and its usage in a loose sense. According to him, Proper Khorasan contained regions lying between Balkh in the east, Merv in the north, Sistan in

5580-452: The military installations at Nishapur and Merv , slowly expanding eastwards into Tokharistan and Sogdia . Under the Caliphs , Khorasan was the name of one of the three political zones under their dominion (the other two being Eraq-e Arab "Arabic Iraq" and Eraq-e Ajam "Non-Arabic Iraq or Persian Iraq"). Under the Umayyad and Abbasid caliphates, Khorasan was divided into four major sections or quarters ( rub′ ), each section based on

5673-400: The most prominent men of the Marwanid period". Asad's arrival in Khorasan found the province in peril: his predecessor, Muslim ibn Sa'id al-Kilabi , had just attempted a campaign against Ferghana and suffered a major defeat, the so-called " Day of Thirst ", at the hands of the Turgesh Turks and the Soghdian principalities of Transoxiana that had risen up against Muslim rule. From

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5766-445: The much greater figure of merit of CFRP. When the Vindeby Offshore Wind Farm was taken down in Denmark in 2017, 99% of the not- degradable fiberglass from 33 wind turbine blades ended as cut up at the Rærup Controlled Landfill near Aalborg and in 2020, with considerably larger fiberglass quantities, even though it is the least environmentally friendly way of handling waste . Scrapped wind turbine blades are set to become

5859-438: The nineteenth century. More recently, windmills have been preserved for their historic value, in some cases as static exhibits when the antique machinery is too fragile to be put in motion, and other cases as fully working mills. Of the 10,000 windmills in use in the Netherlands around 1850, about 1,000 are still standing. Most of these are being run by volunteers, though some grist mills are still operating commercially. Many of

5952-457: The present territories of northeastern Iran , parts of Afghanistan and southern parts of Central Asia , extending as far as the Amu Darya (Oxus) river. However, the name has often been used in a loose sense to include a wider region that included most of Transoxiana (encompassing Bukhara and Samarqand in present-day Uzbekistan ), extended westward to the Caspian coast and to the Dasht-e Kavir southward to Sistan , and eastward to

6045-602: The ruling elite of Transoxiana was partially of Turkic origins whereas the local population was mostly a diverse mix of local Iranian populations. As the Arabs reached Transoxiana following the conquest of the Sassanid Persian Empire, local Iranian-Turkic and Arab armies clashed over the control of Transoxiana's Silk Road cities. In particular, the Turgesh under the leadership of Suluk, and Khazars under Barjik clashed with their Arab neighbours in order to control this economically important region. Two notable Umayyad generals, Qutayba ibn Muslim and Nasr ibn Sayyar , were instrumental in

6138-450: The sailcloth was spread, while in colder climates, the cloth was replaced by wooden slats, which were easier to handle in freezing conditions. The jib sail is commonly found in Mediterranean countries and consists of a simple triangle of cloth wound round a spar. In all cases, the mill needs to be stopped to adjust the sails. Inventions in Great Britain in the late eighteenth and nineteenth centuries led to sails that automatically adjust to

6231-446: The saws. Windmills have been used to power many other industrial processes, including papermills , threshing mills, and to process oil seeds, wool, paints, and stone products. In the 14th century, windmills became popular in Europe; the total number of wind-powered mills is estimated to have been around 200,000 at the peak in 1850, which is close to half of the some 500,000 water wheels . Windmills were applied in regions where there

6324-412: The sources agree that al-Kirmani stood at the time as the most prominent man in Khorasan and should have been the clear choice for governor. His Yemeni roots (he was the leader of the Azd in Khorasan), however, made him unpalatable to the Caliph. Khorasan became the headquarters of the Abbasid Revolution against the Umayyads . It was led by Abu Muslim , who himself belonged to Khorasan. This province

6417-438: The south, Nishapur in the west and Herat, known as the Pearl of Khorasan , in the center. Improper Khorasan's boundaries extended to as far as Hazarajat and Kabul in the east, Baluchistan in the south, Transoxiana and Khwarezm in the north, and Damghan and Gorgan in the west. During the Sasanian era, likely in the reign of Khusrow I , Persia was divided into four regions (known as kust Middle Persian), Khwārvarān in

6510-538: The stiffness, strength, and toughness requirements determined by the loading, the blade needs to be lightweight, and the weight of the blade scales with the cube of its radius. To determine which materials fit the criteria described above, a parameter known as the beam merit index is defined: Mb = E^1/2 / rho, where E is Young's modulus and rho is the density. The best blade materials are carbon fiber and glass fiber reinforced polymers ( CFRP and GFRP ). Currently, GFRP materials are chosen for their lower cost, despite

6603-415: The stone nuts directly, instead of the spur gear arrangement. Additional gear wheels drive a sack hoist or other machinery. The machinery differs if the windmill is used for other applications than milling grain. A drainage mill uses another set of gear wheels on the bottom end of the upright shaft to drive a scoop wheel or Archimedes' screw . Sawmills uses a crankshaft to provide a reciprocating motion to

6696-428: The suction (downwind) side of the blade is subject to cyclic compression-compression loading. Edgewise bending subjects the leading edge to a tensile load, and the trailing edge to a compressive load. The remainder of the shell, not supported by the spars or laminated at the leading and trailing edges, is designed as a sandwiched structure, consisting of multiple layers to prevent elastic buckling. In addition to meeting

6789-404: The sunken type, where the post was buried in an earth mound to support it. Later, a wooden support was developed called the trestle . This was often covered over or surrounded by a roundhouse to protect the trestle from the weather and to provide storage space. This type of windmill was the most common in Europe until the 19th century when more powerful tower and smock mills replaced them. In

6882-558: The term has been source of great nostalgia and nationalism, especially amongst the Tajiks of Central Asia. Many Tajiks regard Khorasan as an integral part of their national identity, which has preserved an interest in the term, including its meaning and cultural significance, both in common discussion and academia, despite its falling out of political use in the region. According to Afghan historian Ghulam Mohammad Ghobar (1897–1978), Afghanistan's current Persian-speaking territories formed

6975-462: The throne to Khorasan following the Arab invasion in the western parts of the empire. After the assassination of the king, Khorasan was conquered by Arab Muslims in 647 AD. Like other provinces of Persia it became a province of the Umayyad Caliphate . The first movement against the Arab conquest was led by Abu Muslim Khorasani between 747 and 750. Originally from Isfahan , scholars believe Abu Muslim

7068-582: The vertical type) dates from 1185, in the former village of Weedley in Yorkshire which was located at the southern tip of the Wold overlooking the Humber Estuary . Several earlier, but less certainly dated, 12th-century European sources referring to windmills have also been found. These earliest mills were used to grind cereals . The evidence at present is that the earliest type of European windmill

7161-717: The vertical-axle windmill had reached parts of Southern Europe, including the Iberian Peninsula (via Al-Andalus ) and the Aegean Sea (in the Balkans ). A similar type of horizontal windmill with rectangular blades, used for irrigation, can also be found in thirteenth-century China (during the Jurchen Jin dynasty in the north), introduced by the travels of Yelü Chucai to Turkestan in 1219. Vertical-axle windmills were built, in small numbers, in Europe during

7254-537: The very end of his life". However, in the climate of the times, his nomination owed more to his appropriate tribal affiliation than his personal qualities. In 724, immediately after the rise of Hisham ibn Abd al-Malik (r. 724–743) to the throne, Asad's brother Khalid al-Qasri was appointed to the important post of governor of Iraq , with responsibility over the entire Islamic East, which he held until 738. Khalid in turn named Asad as governor of Khorasan. The two brothers thus became, according to Patricia Crone , "among

7347-608: The village of Askov. By 1908, there were 72 wind-driven electric generators in Denmark, ranging from 5 to 25 kW. By the 1930s, windmills were widely used to generate electricity on farms in the United States where distribution systems had not yet been installed, built by companies such as Jacobs Wind , Wincharger, Miller Airlite, Universal Aeroelectric, Paris-Dunn, Airline, and Winpower. The Dunlite Corporation produced turbines for similar locations in Australia. Forerunners of modern horizontal-axis utility-scale wind generators were

7440-441: The west, apāxtar in the north, nīmrūz in the south and Khorasan in the east. Since the Sasanian territories were more or less remained stable up to Islamic conquests, it can be concluded that Sasanian Khorasan was bordered to the south by Sistan and Kerman, to the west by the central deserts of modern Iran, and to the east by China and India. In the Sasanian era, Khorasan was further divided into four smaller regions, and each region

7533-489: The wind either by winches or gearing inside the cap or from a winch on the tail pole outside the mill. A method of keeping the cap and sails into the wind automatically is by using a fantail , a small windmill mounted at right angles to the sails, at the rear of the windmill. These are also fitted to tail poles of post mills and are common in Great Britain and English-speaking countries of the former British Empire, Denmark, and Germany but rare in other places. Around some parts of

7626-450: The wind speed without the need for the miller to intervene, culminating in patent sails invented by William Cubitt in 1807. In these sails, the cloth is replaced by a mechanism of connected shutters. In France, Pierre-Théophile Berton invented a system consisting of longitudinal wooden slats connected by a mechanism that lets the miller open them while the mill is turning. In the twentieth century, increased knowledge of aerodynamics from

7719-461: The windmill is closed or not functional. A slight tilt of the sails (top blade at 1 o'clock) signals joy, such as the birth of a healthy baby. A tilt of the blades to 11-2-5-8 o'clock signals mourning, or warning. It was used to signal the local region during Nazi operations in World War II, such as searches for Jews. Across the Netherlands, windmills were placed in mourning positions in honor of

7812-521: The wing scrap have been disposed of in Denmark, and the waste problem will grow significantly in the coming years when more and more wind turbines have reached their end of life. According to the SDU lecturer's calculations, the waste sector in Denmark will have to receive 46,400 tonnes of fiberglass from wind turbine blades over the next 20–25 years. As so, at the island , Lolland , in Denmark, 250 tonnes of fiberglass from wind turbine waste also pours up on

7905-465: Was first established as an administrative division in the 6th century (approximately after 520) by the Sasanians , during the reign of Kavad I ( r.  488–496, 498/9–531 ) or Khosrow I ( r.  531–579 ), and comprised the eastern and northeastern parts of the empire. The use of Bactrian Miirosan 'the east' as an administrative designation under Alkhan rulers in the same region

7998-483: Was first given to the eastern province of Persia (Ancient Iran) during the Sasanian Empire and was used from the late Middle Ages in distinction to neighbouring Transoxiana. The Sassanian name Xwarāsān has in turn been argued to be a calque of the Bactrian name of the region, Miirosan (Bactrian spelling: μιιροσανο, μιροσανο, earlier μιυροασανο), which had the same meaning 'sunrise, east' (corresponding to

8091-685: Was more a matter of political and territorial gain. Tahir had helped the Caliph subdue other nationalistic movements in other parts of Persia such as Maziar 's movement in Tabaristan . Other major independent dynasties who ruled over Khorasan were the Saffarids from Zaranj (861–1003), Samanids from Bukhara (875–999), Ghaznavids from Ghazni (963–1167), Seljuqs (1037–1194), Khwarezmids (1077–1231), Ghurids (1149–1212), and Timurids (1370–1506). In 1221, Genghis Khan 's son Tolui oversaw

8184-578: Was part of the Iranian world that had been heavily colonised by Arab tribes following the Muslim conquest with the intent of replacing Umayyad dynasty which is proved to be successful under the sign of the Black Standard . Between the early 16th and early 18th centuries, parts of Khorasan were contested between the Safavids and the Uzbeks . A part of the Khorasan region was conquered in 1722 by

8277-520: Was probably Persian. It's possible he may have been born a slave. According to the ancient Persian historian Al-Shahrastani , he was a Kaysanite . This revolutionary Shi'a movement rejected the three Caliphs that had preceded Ali . Abu Muslim helped the Abbasids come to power but was later killed by Al-Mansur, an Abbasid Caliph. The first kingdom independent from Arab rule was established in Khorasan by Tahir Phoshanji in 821, but it seems that it

8370-524: Was ruled by a marzban . These four regions were Nishapur, Marv, Herat and Balkh. Khorasan in the east saw some conflict with the Hephthalites who became the new rulers in the area but the borders remained stable. Being the eastern parts of the Sassanids and further away from Arabia , Khorasan region was conquered after the remaining Persia. The last Sassanid king of Persia, Yazdgerd III , moved

8463-409: Was the post mill, so named because of the large upright post on which the mill's main structure (the "body" or "buck") is balanced. By mounting the body this way, the mill can rotate to face the wind direction; an essential requirement for windmills to operate economically in north-western Europe, where wind directions are variable. The body contains all the milling machinery. The first post mills were of

8556-511: Was too little water, where rivers freeze in winter and in flat lands where the flow of the river was too slow to provide the required power. With the coming of the Industrial Revolution , the importance of wind and water as primary industrial energy sources declined, and they were eventually replaced by steam (in steam mills ) and internal combustion engines, although windmills continued to be built in large numbers until late in

8649-401: Was used mostly for lifting water from wells. Larger versions were also used for tasks such as sawing wood, chopping hay, and shelling and grinding grain. In early California and some other states, the windmill was part of a self-contained domestic water system which included a hand-dug well and a wooden water tower supporting a redwood tank enclosed by wooden siding known as a tankhouse . During

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