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Wind Engine
A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, specifically to mill grain (gristmills), but the term is also extended to windpumps, wind turbines, and other applications, in some parts of the English speaking world. The term wind engine is 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 the 12th century. Regarded as an icon of Dutch culture, there are approximately 1,000 windmills in the Netherlands today. Forerunners 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.Dietrich Lohrmann, "Von der östlichen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornell University
Cornell University is a private statutory land-grant research university based in Ithaca, New York. It is a member of the Ivy League. Founded in 1865 by Ezra Cornell and Andrew Dickson White, Cornell was founded with the intention to teach and make contributions in all fields of knowledge—from the classics to the sciences, and from the theoretical to the applied. These ideals, unconventional for the time, are captured in Cornell's founding principle, a popular 1868 quotation from founder Ezra Cornell: "I would found an institution where any person can find instruction in any study." Cornell is ranked among the top global universities. The university is organized into seven undergraduate colleges and seven graduate divisions at its main Ithaca campus, with each college and division defining its specific admission standards and academic programs in near autonomy. The university also administers three satellite campuses, two in New York City and one in Education City, Qatar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography In Medieval Islam
Medieval Islamic geography and cartography refer to the study of geography and cartography in the Muslim world during the Islamic Golden Age (variously dated between the 8th century and 16th century). Muslim scholars made advances to the map-making traditions of earlier cultures, particularly the Hellenistic geographers Ptolemy and Marinus of Tyre, combined with what explorers and merchants learned in their travels across the Old World ( Afro-Eurasia). Islamic geography had three major fields: exploration and navigation, physical geography, and cartography and mathematical geography. Islamic geography reached its apex with Muhammad al-Idrisi in the 12th century. History Islamic geography began in the 8th century, influenced by Hellenistic geography, combined with what explorers and merchants learned in their travels across the Old World ( Afro-Eurasia). Muslim scholars engaged in extensive exploration and navigation during the 9th-12th centuries, including journeys across the Mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umar Ibn Al-Khattab
ʿUmar ibn al-Khaṭṭāb ( ar, عمر بن الخطاب, also spelled Omar, ) was the second Rashidun caliph, ruling from August 634 until his assassination in 644. He succeeded Abu Bakr () as the second caliph of the Rashidun Caliphate on 23 August 634. Umar was a senior companion and father-in-law of the Islamic prophet Muhammad. He was also an expert Muslim jurist known for his pious and just nature, which earned him the epithet ''al-Fārūq'' ("the one who distinguishes (between right and wrong)"). Umar initially opposed Muhammad, his distant Qurayshite kinsman and later son-in-law. Following his conversion to Islam in 616, he became the first Muslim to openly pray at the Kaaba. Umar participated in almost all battles and expeditions under Muhammad, who bestowed the title ''al-Fārūq'' ('the Distinguisher') upon Umar, for his judgements. After Muhammad's death in June 632, Umar pledged allegiance to Abu Bakr () as the first caliph and served as the closest adviser t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rashidun
, image = تخطيط كلمة الخلفاء الراشدون.png , caption = Calligraphic representation of Rashidun Caliphs , birth_place = Mecca, Hejaz, Arabia present-day Saudi Arabia , known_for = Companions of the Prophet , title = Ar-Rashidun , family = Quraysh The Rashidun Caliphs ( ar, الخلفاء الراشدون, translit=al-Khulafāʾ al-Rāshidūn, ), often simply called the Rashidun, are the first four caliphs (lit.: 'successors') who led the Muslim community following the death of the Islamic prophet Muhammad: Abu Bakr (), Umar (), Uthman (), and Ali (). The reign of these caliphs, called the Rashidun Caliphate (632–661), is considered in Sunni Islam to have been 'rightly guided' (Arabic: ), meaning that it constitutes a model ( ) to be followed and emulated from a religious point of view. History The first four caliphs who succeeded Muhammad are known as the Rashidun (rightly-guided) Caliphs. # Ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margate Hooper's Mill
Margate is a seaside town on the north coast of Kent in south-east England. The town is estimated to be 1.5 miles long, north-east of Canterbury and includes Cliftonville, Garlinge, Palm Bay and Westbrook. The town has been a significant maritime port since the Middle Ages, and was associated with Dover as part of the Cinque Ports in the 15th century. It became a popular place for holidaymakers in the 18th century, owing to easy access via the Thames, and later with the arrival of the railways. Popular landmarks include the sandy beaches and the Dreamland amusement park. During the late 20th century, the town went into decline along with other British seaside resorts, but attempts are being made to revitalise the economy. History Margate was listed in the Domesday Book of 1086 as lying within the hundred of Thanet and the county of Kent. Margate was recorded as "Meregate" in 1264 and as "Margate" in 1299, but the spelling continued to vary into modern times. The name i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grain
A grain is a small, hard, dry fruit (caryopsis) – with or without an attached hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and legumes. After being harvested, dry grains are more durable than other staple foods, such as starchy fruits (plantains, breadfruit, etc.) and tubers ( sweet potatoes, cassava, and more). This durability has made grains well suited to industrial agriculture, since they can be mechanically harvested, transported by rail or ship, stored for long periods in silos, and milled for flour or pressed for oil. Thus, the grain market is a major global commodity market that includes crops such as maize, rice, soybeans, wheat and other grains. Grains and cereal Grains and cereal are synonymous with caryopses, the fruits of the grass family. In agronomy and commerce, seeds or fruits from other plant families are called grains if they resemble c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greater Iran
Greater Iran ( fa, ایران بزرگ, translit=Irān-e Bozorg) refers to a region covering parts of Western Asia, Central Asia, South Asia, Xinjiang, and the Caucasus, where both Culture of Iran, Iranian culture and Iranian languages have had a significant presence and impact. Historically, this was a region long-ruled by the dynasties of various List of monarchs of Persia, Iranian empires, under whose rule the local populace incorporated considerable aspects of Persian culture through extensive inter-contact, or alternatively where sufficient Iranian peoples settled to still maintain communities who patronize their respective cultures; it roughly corresponds geographically to the Iranian plateau and its bordering plains. The Encyclopædia Iranica uses the term ''Iranian Cultural Continent'' to describe this region. In addition to the Iran, modern state of Iran, the term "Greater Iran" includes all of the territory ruled by various Iranian peoples throughout histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and borders fourteen countries by land, the most of any country in the world, tied with Russia. Covering an area of approximately , it is the world's third largest country by total land area. The country consists of 22 provinces, five autonomous regions, four municipalities, and two Special Administrative Regions (Hong Kong and Macau). The national capital is Beijing, and the most populous city and financial center is Shanghai. Modern Chinese trace their origins to a cradle of civilization in the fertile basin of the Yellow River in the North China Plain. The semi-legendary Xia dynasty in the 21st century BCE and the well-attested Shang and Zhou dynasties developed a bureaucratic political system to serve hereditary monarchies, or dyna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tibet
Tibet (; ''Böd''; ) is a region in East Asia, covering much of the Tibetan Plateau and spanning about . It is the traditional homeland of the Tibetan people. Also resident on the plateau are some other ethnic groups such as Monpa people, Monpa, Tamang people, Tamang, Qiang people, Qiang, Sherpa people, Sherpa and Lhoba peoples and now also considerable numbers of Han Chinese and Hui people, Hui settlers. Since Annexation of Tibet by the People's Republic of China, 1951, the entire plateau has been under the administration of the People's Republic of China, a major portion in the Tibet Autonomous Region, and other portions in the Qinghai and Sichuan provinces. Tibet is the highest region on Earth, with an average elevation of . Located in the Himalayas, the highest elevation in Tibet is Mount Everest, Earth's highest mountain, rising 8,848.86 m (29,032 ft) above sea level. The Tibetan Empire emerged in the 7th century. At its height in the 9th century, the Tibet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prayer Wheel
A prayer wheel is a cylindrical wheel () on a spindle made from metal, wood, stone, leather, or coarse cotton, widely used in Tibet and areas where Tibetan culture is predominant. Traditionally, a mantra is written in Ranjana script or Tibetan script, on the outside of the wheel. The mantra Om mani padme hum is most commonly used, but other mantras may be used as well. Also sometimes depicted are dakinis, Protectors and very often the eight auspicious symbols ('' ashtamangala''). At the core of the cylinder is a "life tree" often made of wood or metal with certain mantras written on or wrapped around it. Many thousands (or in the case of larger prayer wheels, millions) of mantras are then wrapped around this life tree. According to the Tibetan Buddhist tradition based on the lineage texts regarding prayer wheels, spinning such a wheel will have much the same meritorious effect as orally reciting the prayers. Nomenclature and etymology Prayer wheel or mani wheel (). The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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