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97-467: Construction of the telescope took seven years and cost €130 million. Its installation was hampered by weather conditions and the logistical difficulties of transporting equipment to such a remote location. First light was achieved in 2007 and scientific observations began in 2009. The GTC Project is a partnership formed by several institutions from Spain and Mexico , the University of Florida ,

194-590: A constitution for universal representation under a constitutional monarchy was declared, but after the fall of the Bonapartist regime, the Spanish king dismissed the Cortes Generales, set on ruling as an absolute monarch . The French occupation of mainland Spain created an opportunity for overseas criollo elites who resented the privilege towards Peninsular elites and demanded retroversion of

291-480: A ); a flow resistance (orifice); a buffer volume, in which the pressure p B is practically constant. The Joule-Thomson (JT) cooler was invented by Carl von Linde and William Hampson so it is also called the Linde-Hampson cooler. It is a simple type of cooler which is widely applied as cryocooler or as the (final stage) of coolants. It can easily be miniaturized, but it is also used on a very large scale in

388-476: A compression and expansion space, a regenerator, and a displacer. Usually the regenerator and the displacer are combined in one body. The pressure variations in the cold head are obtained by connecting it periodically to the high- and low-pressure sides of a compressor by a rotating valve. Its position is synchronized with the motion of the displacer. During the opening and closing of the valves irreversible processes take place, so GM-coolers have intrinsic losses. This

485-423: A compressor, a split pipe, and a cold finger. Usually there are two pistons moving in opposite directions driven by AC magnetic fields (as in loudspeakers). The pistons can be suspended by so-called flexure bearings. They provide stiffness in the radial direction and flexibility in the axial direction. The pistons and the compressor casing don't touch so no lubricants are needed and there is no wear. The regenerator in

582-436: A cryogen; one of the requirements of CanariCam was that it should require no expensive and difficult to handle cryogens. CanariCam used a two-stage closed cycle cryocooler system to cool the cold optics and cryostat interior to approximately 28  K (−245 °C; −409 °F), and the detector itself to around 8  K (−265 °C; −445 °F), the temperature at which the detector worked most efficiently. CanariCam

679-589: A female figure with a rabbit at her feet, and Strabo called it the "land of the rabbits". The word in question actually means " Hyrax ", possibly due to the Phoenicians confusing the two animals. There is also the claim that "Hispania" derives from the Basque word Ezpanna , meaning "edge" or "border", another reference to the fact that the Iberian Peninsula constitutes the southwest corner of

776-400: A large measure of regional autonomy. Cryocooler A refrigerator designed to reach cryogenic temperatures (below 120 K, -153 °C, -243.4 °F) is often called a cryocooler . The term is most often used for smaller systems, typically table-top size, with input powers less than about 20 kW. Some can have input powers as low as 2–3 W. Large systems, such as those used for cooling

873-615: A puppet kingdom satellite to the French Empire was installed with Joseph Bonaparte as king. The 2 May 1808 revolt was one of many uprisings across the country against the French occupation. These revolts marked the beginning of a devastating war of independence against the Napoleonic regime. Further military action by Spanish armies, guerrilla warfare and an Anglo-Portuguese allied army, combined with Napoleon's failure on

970-532: A reaction against the gallicised elites and following defeat in the field, peace was made with France in 1795 at the Peace of Basel in which Spain lost control over two-thirds of the island of Hispaniola . In 1807, a secret treaty between Napoleon and the unpopular prime minister led to a new declaration of war against Britain and Portugal. French troops entered the country to invade Portugal but instead occupied Spain's major fortresses. The Spanish king abdicated and

1067-761: A resolution in favour of democracy. With Franco's death in November 1975, Juan Carlos succeeded to the position of King of Spain and head of state in accordance with the Francoist law. With the approval of the new Spanish Constitution of 1978 and the restoration of democracy , the State devolved much authority to the regions and created an internal organisation based on autonomous communities . The Spanish 1977 Amnesty Law let people of Franco's regime continue inside institutions without consequences, even perpetrators of some crimes during transition to democracy like

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1164-458: A separate country socially, politically, legally, and in currency and language. Habsburg Spain was one of the leading world powers throughout the 16th century and most of the 17th century, a position reinforced by trade and wealth from colonial possessions and became the world's leading maritime power . It reached its apogee during the reigns of the first two Spanish Habsburgs— Charles V/I (1516–1556) and Philip II (1556–1598). This period saw

1261-744: A series of victories against England in the Anglo-Spanish War of 1585–1604 . However, during the middle decades of the 17th century Spain's maritime power went into a long decline with mounting defeats against the Dutch Republic ( Battle of the Downs ) and then England in the Anglo-Spanish War of 1654–1660 ; by the 1660s it was struggling to defend its overseas possessions from pirates and privateers. The Protestant Reformation increased Spain's involvement in religiously charged wars, forcing ever-expanding military efforts across Europe and in

1358-527: Is Madrid , and other major urban areas include Barcelona , Valencia , Seville , Zaragoza , Málaga , Murcia and Palma de Mallorca . In early antiquity, the Iberian Peninsula was inhabited by Celts , Iberians , and other pre-Roman peoples . With the Roman conquest of the Iberian Peninsula , the province of Hispania was established. Following the Romanization and Christianization of Hispania,

1455-464: Is a clear disadvantage of this type of cooler. The advantage is that the cycle frequencies of the compressor and the displacer are uncoupled so that the compressor can run at power-line frequency (50 or 60 Hz) while the cycle of the cold head is 1 Hz. In this way the swept volume of the compressor can be 50 or 60 times smaller than of the cooler. Basically (cheap) compressors of domestic refrigerators can be used, but one must prevent overheating of

1552-496: Is depicted in Fig.1. It consists of (from left to right): Left and right the thermal contact with the surroundings at the temperatures T a and T L is supposed to be perfect so that the compression and expansion are isothermal . The work, performed during the expansion, is used to reduce the total input power. Usually helium is the working fluid. The cooling cycle is split in 4 steps as depicted in Fig.2. The cycle starts when

1649-422: Is represented schematically in Fig.7. From left to right it consists of: a piston which moves back and forth; a heat exchanger X 1 (after cooler) where heat is released at room temperature ( T a ) to the environment; a regenerator; a heat exchanger X L at low temperature ( T L ) where heat is absorbed from the application; a tube, often called the pulse tube; a heat exchanger X 3 to room temperature ( T

1746-873: The Reconquista , repelling Islamic rule in Iberia, which culminated with the Christian seizure of the Nasrid Kingdom of Granada in 1492. The dynastic union of the Crown of Castile and the Crown of Aragon in 1479 under the Catholic Monarchs is often considered the de facto unification of Spain as a nation-state . During the Age of Discovery , Spain pioneered the exploration of the New World , made

1843-681: The Siglo de Oro , Spanish art , architecture , music , poetry , painting , literature , and cuisine have been influential worldwide, particularly in Western Europe and the Americas . As a reflection of its large cultural wealth , Spain is the world's second-most visited country , has one of the world's largest numbers of World Heritage Sites , and it is the most popular destination for European students. Its cultural influence extends to over 600 million Hispanophones , making Spanish

1940-596: The 12 April 1931 municipal elections . These gave a resounding victory to the Republican-Socialist candidacies in large cities and provincial capitals, with a majority of monarchist councilors in rural areas. The king left the country and the proclamation of the Republic on 14 April ensued, with the formation of a provisional government. A constitution for the country was passed in October 1931 following

2037-602: The Basque Country and the creation of a mass tourism industry. Franco's rule was also characterised by authoritarianism , promotion of a unitary national identity , National Catholicism , and discriminatory language policies . In 1962, a group of politicians involved in the opposition to Franco's regime inside the country and in exile met in the congress of the European Movement in Munich, where they made

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2134-605: The Bourbons , was installed. The Crowns of Castile and Aragon had been long united only by the Monarchy and the common institution of the Inquisition's Holy Office . A number of reform policies (the so-called Bourbon Reforms ) were pursued by the Monarchy with the overarching goal of centralized authority and administrative uniformity. They included the abolishment of many of the old regional privileges and laws, as well as

2231-766: The Canary Islands , in the Atlantic Ocean, the Balearic Islands , in the Mediterranean Sea, and the autonomous cities of Ceuta and Melilla , in Africa. Peninsular Spain is bordered to the north by France , Andorra , and the Bay of Biscay ; to the east and south by the Mediterranean Sea and Gibraltar ; and to the west by Portugal and the Atlantic Ocean. Spain's capital and largest city

2328-756: The Cuban War of Independence and the Philippine Revolution broke out and eventually the United States became involved. The Spanish–American War was fought in the spring of 1898 and resulted in Spain losing the last of its once vast colonial empire outside of North Africa. El Desastre (the Disaster), as the war became known in Spain, gave added impetus to the Generation of '98 . Although

2425-785: The European Union  (green) Spain , formally the Kingdom of Spain , is a country in Southwestern Europe with territories in North Africa . Featuring the southernmost point of continental Europe , it is the largest country in Southern Europe and the fourth-most populous European Union member state. Spanning across the majority of the Iberian Peninsula , its territory also includes

2522-1092: The Italian Wars , the Schmalkaldic War , the Dutch Revolt , the War of the Portuguese Succession , clashes with the Ottomans , intervention in the French Wars of Religion and the Anglo-Spanish War . Through exploration and conquest or royal marriage alliances and inheritance, the Spanish Empire expanded across vast areas in the Americas, the Indo-Pacific, Africa as well as the European continent (including holdings in

2619-588: The June 1931 Constituent general election , and a series of cabinets presided by Manuel Azaña supported by republican parties and the PSOE followed. In the election held in 1933 the right triumphed and in 1936, the left. During the Second Republic there was a great political and social upheaval, marked by a sharp radicalization of the left and the right. Instances of political violence during this period included

2716-633: The Massacre of 3 March 1976 in Vitoria or 1977 Massacre of Atocha . In the Basque Country, moderate Basque nationalism coexisted with a radical nationalist movement led by the armed organisation ETA until the latter's dissolution in May 2018. The group was formed in 1959 during Franco's rule but had continued to wage its violent campaign even after the restoration of democracy and the return of

2813-692: The National Autonomous University of Mexico , and the Instituto de Astrofísica de Canarias (IAC). Planning for the construction of the telescope, which started in 1987, involved more than 1,000 people from 100 companies. The division of telescope time reflects the structure of its financing: 90% Spain, 5% Mexico and 5% the University of Florida. The GTC began its preliminary observations on 13 July 2007, using 12 segments of its primary mirror , made of Zerodur glass-ceramic by

2910-721: The World Trade Organization (WTO). The name of Spain ( España ) comes from Hispania , the name used by the Romans for the Iberian Peninsula and its provinces during the Roman Empire . The etymological origin of the term Hispania is uncertain, although the Phoenicians referred to the region as i-shphan-im , possibly meaning "Land of Rabbits" or "Land of Metals". Jesús Luis Cunchillos  [ es ] and José Ángel Zamora, experts in Semitic philology at

3007-927: The fall of the Western Roman Empire ushered in the inward migration of tribes from Central Europe, including the Visigoths , who formed the Visigothic Kingdom centred on Toledo . In the early eighth century, most of the peninsula was conquered by the Umayyad Caliphate , and during early Islamic rule, Al-Andalus became a dominant peninsular power centred on Córdoba . Several Christian kingdoms emerged in Northern Iberia, chief among them Asturias , León , Castile , Aragon , Navarre , and Portugal ; made an intermittent southward military expansion and repopulation, known as

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3104-489: The first circumnavigation of the globe and formed one of the largest empires in history . The Spanish Empire reached a global scale and spread across all continents, underpinning the rise of a global trading system fueled primarily by precious metals . In the 18th century, the Bourbon reforms centralized mainland Spain. In the 19th century, after the Napoleonic occupation and the victorious Spanish War of independence ,

3201-609: The multi-object spectroscopy mode allows 92 objects to be observed simultaneously in a field of view of 3.5 arcmin x 3.5 arcmin by means of an equal number of robotic positioners. Both the LCB and MOS modes make use of 100 μm-core optical fibers (1267 in total) that are attached to a set of microlens arrays (with 623 spaxels in the case of the LCB and 92 x 7 in the case of the MOS) with each microlens covering an hexagonal region of 0.62 arcsec in diameter. The University of Florida's CanariCam

3298-526: The 11th century, the Caliphate of Córdoba collapsed, fracturing into a series of petty kingdoms ( Taifas ), often subject to the payment of a form of protection money ( Parias ) to the Northern Christian kingdoms, which otherwise undertook a southward territorial expansion. The capture of the strategic city of Toledo in 1085 marked a significant shift in the balance of power in favour of

3395-523: The Americas attended the ceremony. MEGARA (Multi-Espectrografo en GTC de Alta Resolucion para Astronomia) is an optical integral-field and multi-object spectrograph covering the visible light and near infrared wavelength range between 0.365 and 1 μm with a spectral resolution in the range R=6000–20000. The MEGARA IFU (also called the Large Compact Bundle, or LCB) offers a contiguous field of view of 12.5 arcsec x 11.3 arcsec, while

3492-632: The Christian kingdoms. The arrival from North Africa of the Islamic ruling sects of the Almoravids and the Almohads achieved temporary unity upon the Muslim-ruled territory, with a stricter, less tolerant application of Islam, and partially reversed some Christian territorial gains. The Kingdom of León was the strongest Christian kingdom for centuries. In 1188, the first form (restricted to

3589-884: The European Union, the eurozone , North Atlantic Treaty Organization (NATO), a permanent guest of the G20 , and is part of many other international organizations such as the Council of Europe (CoE), the Organization of Ibero-American States (OEI), the Union for the Mediterranean , the Organisation for Economic Co-operation and Development (OECD), the Organization for Security and Co-operation in Europe (OSCE), and

3686-496: The European continent. Archaeological research at Atapuerca indicates the Iberian Peninsula was populated by hominids 1.3 million years ago. Modern humans first arrived in Iberia from the north on foot about 35,000 years ago. The best-known artefacts of these prehistoric human settlements are the paintings in the Altamira cave of Cantabria in northern Iberia, which were created from 35,600 to 13,500 BCE by Cro-Magnon . Archaeological and genetic evidence suggests that

3783-565: The German company Schott AG . Later, the number of segments was increased to a total of 36 hexagonal segments fully controlled by an active optics control system, working together as a reflective unit. Its first instrument was the Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS). Scientific observations began in May 2009. The Gran Telescopio Canarias formally opened its shutters on July 24, 2009, inaugurated by King Juan Carlos I of Spain . More than 500 astronomers, government officials and journalists from Europe and

3880-425: The Iberian Peninsula acted as one of several major refugia from which northern Europe was repopulated following the end of the last ice age . The two largest groups inhabiting the Iberian Peninsula before the Roman conquest were the Iberians and the Celts . The Iberians inhabited the Mediterranean side of the peninsula. The Celts inhabited much of the interior and Atlantic sides of the peninsula. Basques occupied

3977-411: The Italian Peninsula, the Low Countries and the Franche-Comté ). The so-called Age of Discovery featured explorations by sea and by land, the opening-up of new trade routes across oceans, conquests and the beginnings of European colonialism . Precious metals , spices, luxuries, and previously unknown plants brought to the metropole played a leading part in transforming the European understanding of

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4074-413: The Mediterranean. By the middle decades of a war- and plague -ridden 17th-century Europe, the Spanish Habsburgs had enmeshed the country in continent-wide religious-political conflicts. These conflicts drained it of resources and undermined the economy generally. Spain managed to hold on to most of the scattered Habsburg empire, and help the imperial forces of the Holy Roman Empire reverse a large part of

4171-400: The Russian front , led to the retreat of French imperial armies from the Iberian Peninsula in 1814, and the return of King Ferdinand VII . During the war, in 1810, a revolutionary body, the Cortes of Cádiz , was assembled to coordinate the effort against the Bonapartist regime and to prepare a constitution. It met as one body, and its members represented the entire Spanish empire. In 1812,

4268-438: The Second World War, although it was sympathetic to the Axis and provided the Nazi Wehrmacht with Spanish volunteers in the Eastern Front . The only legal party under Franco's dictatorship was the Falange Española Tradicionalista y de las JONS (FET y de las JONS), formed in 1937 upon the merging of the Fascist Falange Española de las JONS and the Carlist traditionalists and to which the rest of right-wing groups supporting

4365-467: The Spanish National Research Council ( Consejo Superior de Investigaciones Científicas , CSIC), conducted a comparative philological study between several Semitic languages and hypothesize that the Phoenician name translates as "land where metals are forged", having determined that the name originated in reference to the gold mines of the Iberian Peninsula. There have been a number of accounts and hypotheses about its origin: Jesús Luis Cunchillos argues that

4462-642: The Strait of Gibraltar. Upon the conclusion of the Granada War , the Nasrid Sultanate of Granada (the remaining Muslim-ruled polity in the Iberian Peninsula after 1246) capitulated in 1492 to the military strength of the Catholic Monarchs , and it was integrated from then on in the Crown of Castile. In 1469, the crowns of the Christian kingdoms of Castile and Aragon were united by the marriage of their monarchs, Isabella I and Ferdinand II, respectively. In 1492, Jews were forced to choose between conversion to Catholicism or expulsion; as many as 200,000 Jews were expelled from Castile and Aragon . The year 1492 also marked

4559-468: The US to establish a military presence on the Iberian Peninsula as a counter to any possible move by the Soviet Union into the Mediterranean basin. US Cold War strategic priorities included the dissemination of American educational ideas to foster modernization and expansion. In the 1960s, Spain registered an unprecedented rate of economic growth which was propelled by industrialisation , a mass internal migration from rural areas to Madrid , Barcelona and

4656-542: The advances made by Protestant forces, but it was finally forced to recognise the separation of Portugal and the United Provinces (Dutch Republic), and eventually suffered some serious military reverses to France in the latter stages of the immensely destructive, Europe-wide Thirty Years' War . In the latter half of the 17th century, Spain went into a gradual decline, during which it surrendered several small territories to France and England; however, it maintained and enlarged its vast overseas empire, which remained intact until

4753-400: The arrival of Christopher Columbus in the New World , during a voyage funded by Isabella. Columbus's first voyage crossed the Atlantic and reached the Caribbean Islands, beginning the European exploration and conquest of the Americas. The Treaty of Granada guaranteed religious tolerance towards Muslims, for a few years before Islam was outlawed in 1502 in Castile and 1527 in Aragon, leading

4850-419: The beginning of the 19th century. The decline culminated in a controversy over succession to the throne which consumed the first years of the 18th century. The War of the Spanish Succession was a wide-ranging international conflict combined with a civil war, and was to cost the kingdom its European possessions and its position as a leading European power. During this war, a new dynasty originating in France,

4947-409: The bishops, the magnates, and 'the elected citizens of each city') of modern parliamentary session in Europe was held in León ( Cortes of León ). The Kingdom of Castile , formed from Leonese territory, was its successor as strongest kingdom. The kings and the nobility fought for power and influence in this period. The example of the Roman emperors influenced the political objective of the Crown, while

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5044-473: The burning of churches, the 1932 failed coup d'état led by José Sanjurjo , the Revolution of 1934 and numerous attacks against rival political leaders. On the other hand, it is also during the Second Republic when important reforms to modernize the country were initiated: a democratic constitution, agrarian reform, restructuring of the army, political decentralization and women's right to vote . The Spanish Civil War broke out in 1936: on 17 and 18 July, part of

5141-417: The cold finger is suspended by a spring. The cooler operates at a frequency near the resonance frequency of the mass-spring system of the cold finger. Gifford- McMahon (GM) coolers have found widespread application in many low-temperature systems e.g. in MRI and cryopumps. Fig.5 is a schematic diagram. Helium at pressures in the 10–30 bars (150–440 psi) range is the working fluid. The cold head contains

5238-410: The cold head driving the gas back and forth between the warm and the cold end of the cold head via the regenerator. No work is required to move the displacer since, ideally there is no pressure drop over it. Typically its motion is 90 degrees out of phase with the piston. In the ideal case the COP also equals to the Carnot COP. Another type of Stirling cooler is the split-pair type (Fig.4), consisting of

5335-458: The compressor as it is not designed for helium. One must also prevent oil vapor from entering the regenerator by high-quality purification traps. The cycle can be divided in four steps, with Fig.6, as follows: The cycle starts with the low-pressure (LP) valve closed, the high-pressure (HP) valve open, and the displacer all the way to the right (so in the cold region). All the gas is at room temperature. A so-called Stirling-type single-orifice PTR

5432-428: The conflict between progressives and moderates ended in a weak early constitutional period. The 1868 Glorious Revolution was followed by the 1868–1874 progressive Sexenio Democrático (including the short-lived First Spanish Republic ), which yielded to a stable monarchic period, the Restoration (1875–1931). In the late 19th century nationalist movements arose in the Philippines and Cuba. In 1895 and 1896

5529-435: The customs barrier between the Crowns of Aragon and Castile in 1717, followed by the introduction of new property taxes in the Aragonese kingdoms. The 18th century saw a gradual recovery and an increase in prosperity through much of the empire. The predominant economic policy was an interventionist one, and the State also pursued policies aiming towards infrastructure development as well as the abolition of internal customs and

5626-436: The democratic system of the constitutional monarchy of a two-parties system. The July 1909 Tragic Week events and repression exemplified the social instability of the time. The La Canadiense strike in 1919 led to the first law limiting the working day to eight hours. After a period of Crown-supported dictatorship from 1923 to 1931, the first elections since 1923, largely understood as a plebiscite on Monarchy, took place:

5723-430: The development of railways and incipient capitalism developed in several areas of the country, particularly in Barcelona , as well as labour movement and socialist and anarchist ideas. The 1870 Barcelona Workers' Congress and the 1888 Barcelona Universal Exposition are good examples of this. In 1879, the Spanish Socialist Workers' Party was founded. A trade union linked to this party, Unión General de Trabajadores ,

5820-470: The following political divisions between liberals and absolutists led to the breakaway of most of the American colonies . These political divisions finally converged in the 20th century with the Spanish Civil War , giving rise to the Francoist dictatorship that lasted until 1975. With the restoration of democracy and its entry into the European Union, the country experienced an economic boom that profoundly transformed it socially and politically. Since

5917-421: The gas temperature is ambient temperature (300 K) and the pressure is 200 bars (2,900 psi) (point b). Next it enters the warm (high-pressure) side of the counterflow heat exchanger where it is precooled. It leaves the exchanger at point c. After the JT expansion, point d, it has a temperature of 77.36 K (−195.79 °C; −320.42 °F) and a pressure of 1 bar. The liquid fraction is x . The liquid leaves

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6014-405: The gas. This leads to losses. An important component of refrigerators, operating with oscillatory flows, is the regenerator. A regenerator consists of a matrix of a solid porous material, such as granular particles or metal sieves, through which gas flows back and forth. Periodically heat is stored and released by the material. The thermal contact with the gas must be good and the flow resistance of

6111-431: The globe. The cultural efflorescence witnessed during this period is now referred to as the Spanish Golden Age . The expansion of the empire caused immense upheaval in the Americas as the collapse of societies and empires and new diseases from Europe devastated American indigenous populations. The rise of humanism , the Counter-Reformation and new geographical discoveries and conquests raised issues that were addressed by

6208-432: The heat exchanger to precool the high-pressure fluid before entering the compressor intake. The cycle is then repeated. Heat exchangers are important components of all cryocoolers. Ideal heat exchangers have no flow resistance and the exit gas temperature is the same as the (fixed) body temperature T X of the heat exchanger. Note that even a perfect heat exchanger will not affect the entrance temperature T i of

6305-557: The initial invasion. The Kingdom of Asturias-León consolidated upon this territory. Other Christian kingdoms, such as Navarre and Aragon in the mountainous north, eventually surged upon the consolidation of counties of the Carolingian Marca Hispanica . For several centuries, the fluctuating frontier between the Muslim and Christian-controlled areas of the peninsula was along the Ebro and Douro valleys. Conversion to Islam proceeded at an increasing pace. The muladíes (Muslims of ethnic Iberian origin) are believed to have formed

6402-422: The instrument. CanariCam is designed as a diffraction-limited imager . It is optimized as an imager, and although it offered a range of other observing modes, these did not compromise the imaging capability. CanariCam worked in the thermal infrared between approximately 7.5 and 25  μm . At the short-wavelength end, the cut-off was determined by the atmosphere—specifically atmospheric seeing . At

6499-428: The intellectual movement now known as the School of Salamanca , which developed the first modern theories of what are now known as international law and human rights. Spain's 16th-century maritime supremacy was demonstrated by the victory over the Ottoman Empire at the Battle of Lepanto in 1571 and over Portugal at the Battle of Ponta Delgada in 1582, and then after the setback of the Spanish Armada in 1588, in

6596-461: The introduction of irrigation projects, some of which remain in use. Emperors Hadrian , Trajan , Theodosius I , and the philosopher Seneca were born in Hispania. Christianity was introduced into Hispania in the 1st century CE, and it became popular in the cities in the 2nd century. Most of Spain's present languages and religions, as well as the basis of its laws, originate from this period. Starting in 170 CE, incursions of North-African Mauri in

6693-435: The liquefaction of natural gas. A schematic diagram of a JT liquefier is given in Fig.8. It consists of a compressor, a counterflow heat exchanger, a JT valve, and a reservoir. In Fig.8 the pressures and temperatures refer to the case of a nitrogen liquefier. At the inlet of the compressor the gas is at room temperature (300 K) and a pressure of 1 bar (point a). The compression heat is removed by cooling water. After compression

6790-411: The lives of over 500,000 people and caused the flight of up to a half-million citizens from the country. On 1 April 1939, five months before the beginning of World War II , the rebel side led by Franco emerged victorious, imposing a dictatorship over the whole country. Thousands were imprisoned after the civil war in Francoist concentration camps . The regime remained nominally "neutral" for much of

6887-401: The long wavelength end, the cut-off was determined by the detector; this loses sensitivity beyond around 24 μm, although the cut-off for individual detectors varied significantly. CanariCam was a very compact design. It was designed for a total weight of the cryostat and its on-telescope electronics to be under 400 kg. Most previous mid-infrared instruments have used liquid helium as

6984-557: The majority of the population of Al-Andalus by the end of the 10th century. A series of Viking incursions raided the coasts of the Iberian Peninsula in the 9th and 10th centuries. The first recorded Viking raid on Iberia took place in 844; it ended in failure with many Vikings killed by the Galicians' ballistas ; and seventy of the Vikings' longships captured on the beach and burned by the troops of King Ramiro I of Asturias . In

7081-448: The matrix must be low. These are conflicting requirements. The thermodynamic and hydrodynamic properties of regenerators are complicated, so one usually makes simplifying models. In its most extreme form an ideal regenerator has the following properties: Progress in the cryocooler field in recent decades is in large part due to development of new materials having high heat capacity below 10 K. The basic type of Stirling-type cooler

7178-588: The meseta; however, due to the bellicose inland tribes, the Carthaginians settled on the coasts of the Iberian Peninsula. During the Second Punic War , roughly between 210 and 205 BCE, the expanding Roman Republic captured Carthaginian trading colonies along the Mediterranean coast. Although it took the Romans nearly two centuries to complete the conquest of the Iberian Peninsula , they retained control of it for over six centuries. Roman rule

7275-668: The military carried out a coup d'état that triumphed in only part of the country. The situation led to a civil war, in which the territory was divided into two zones: one under the authority of the Republican government , that counted on outside support from the Soviet Union and Mexico (and from International Brigades ), and the other controlled by the putschists (the Nationalist or rebel faction ), most critically supported by Nazi Germany and Fascist Italy . The Republic

7372-521: The motions of the two pistons is about 90°. In the ideal case the cycle is reversible so the COP (the ratio of the cooling power and the input power) is equal to the Carnot COP given by T L /( T a − T L ). It is not so practical to have a cold piston, as described above, so, in many cases, a displacer is used instead of the cold piston. A displacer is a solid body which moves back and forth in

7469-604: The nobles benefited from feudalism . Muslim strongholds in the Guadalquivir Valley such as Córdoba (1236) and Seville (1248) fell to Castile in the 13th century. The County of Barcelona and the Kingdom of Aragon entered in a dynastic union and gained territory and power in the Mediterranean. In 1229, Majorca was conquered, so was Valencia in 1238. In the 13th and 14th centuries, the North-African Marinids established some enclaves around

7566-480: The only American colonies Spain held were Cuba and Puerto Rico . The Napoleonic War left Spain economically ruined, deeply divided and politically unstable. In the 1830s and 1840s, Carlism (a reactionary legitimist movement supportive of an alternative Bourbon branch), fought against the government forces supportive of Queen Isabella II 's dynastic rights in the Carlist Wars . Government forces prevailed, but

7663-411: The period around the turn of the century was one of increasing prosperity, the 20th century brought little social peace. Spain played a minor part in the scramble for Africa . It remained neutral during World War I . The heavy losses suffered by the colonial troops in conflicts in northern Morocco against Riffians forces brought discredit to the government and undermined the monarchy. Industrialisation,

7760-519: The province of Baetica took place. The Germanic Suebi and Vandals , together with the Sarmatian Alans , entered the peninsula after 409, weakening the Western Roman Empire's jurisdiction over Hispania. The Suebi established a kingdom in north-western Iberia, whereas the Vandals established themselves in the south of the peninsula by 420 before crossing over to North Africa in 429. As

7857-581: The rebels also added. The name of " Movimiento Nacional ", sometimes understood as a wider structure than the FET y de las JONS proper, largely imposed over the later's name in official documents along the 1950s. After the war Spain was politically and economically isolated, and was kept out of the United Nations. This changed in 1955, during the Cold War period, when it became strategically important for

7954-460: The reduction of export tariffs. Projects of agricultural colonisation with new settlements took place in the south of mainland Spain. Enlightenment ideas began to gain ground among some of the kingdom's elite and monarchy. In 1793, Spain went to war against the revolutionary new French Republic as a member of the first Coalition . The subsequent War of the Pyrenees polarised the country in

8051-589: The remaining Muslim population to become nominally Christian Moriscos . About four decades after the War of the Alpujarras (1568–1571), over 300,000 moriscos were expelled , settling primarily in North Africa. The unification of the crowns of Aragon and Castile by the marriage of their sovereigns laid the basis for modern Spain and the Spanish Empire, although each kingdom of Spain remained

8148-537: The root of the term span is the Phoenician word spy , meaning "to forge metals ". Therefore, i-spn-ya would mean "the land where metals are forged". It may be a derivation of the Phoenician I-Shpania , meaning "island of rabbits", "land of rabbits" or "edge", a reference to Spain's location at the end of the Mediterranean; Roman coins struck in the region from the reign of Hadrian show

8245-652: The sovereignty to the people . Starting in 1809 the American colonies began a series of revolutions and declared independence, leading to the Spanish American wars of independence that put an end to the metropole's grip over the Spanish Main . Attempts to re-assert control proved futile with opposition not only in the colonies but also in the Iberian peninsula and army revolts followed. By the end of 1826,

8342-461: The superconducting magnets in particle accelerators are more often called cryogenic refrigerators. Their input powers can be as high as 1 MW. In most cases cryocoolers use a cryogenic fluid as the working substance and employ moving parts to cycle the fluid around a thermodynamic cycle. The fluid is typically compressed at room temperature, precooled in a heat exchanger, then expanded at some low temperature. The returning low-pressure fluid passes through

8439-460: The system at the bottom of the reservoir (point e) and the gas (fraction 1 − x ) flows into the cold (low-pressure) side of the counterflow heat exchanger (point f). It leaves the heat exchanger at room temperature (point a). In order to keep the system in the steady state, gas is supplied to compensate for the liquid fraction x that has been removed. When used as a cryocooler it is preferable to use gas mixtures instead of pure nitrogen. In this way

8536-409: The two pistons are in their most left positions: In the pV diagram (Fig.3) the corresponding cycle consists of two isotherms and two isochores. The volume V is the volume between the two pistons. In practice the cycle is not divided in discrete steps as described above. Usually the motions of both pistons are driven by a common rotary axes which makes the motions harmonic. The phase difference between

8633-453: The western area of the Pyrenees mountain range and adjacent areas; Phoenician-influenced Tartessians flourished in the southwest; and Lusitanians and Vettones occupied areas in the central west. Several cities were founded along the coast by Phoenicians , and trading outposts and colonies were established by Greeks in the East. Eventually, Phoenician- Carthaginians expanded inland towards

8730-419: The western empire disintegrated, the social and economic base became greatly simplified; the successor regimes maintained many of the institutions and laws of the late empire, including Christianity and assimilation into the evolving Roman culture. The Byzantines established an occidental province, Spania , in the south, with the intention of reviving Roman rule throughout Iberia. Eventually, however, Hispania

8827-468: The world's second-most spoken native language and the world's most widely spoken Romance language . Spain is a secular parliamentary democracy and a constitutional monarchy , with King Felipe VI as head of state . A developed country , it is a major advanced capitalist economy, with the world's fifteenth-largest by both nominal GDP and PPP . Spain is a member of the United Nations ,

8924-528: Was a mid- infrared imager with spectroscopic , coronagraphic , and polarimetric capabilities. Since 2012, it had been operating in queue mode at one of the Nasmyth focus stations, until it was temporarily decommissioned in April 2016. Following an upgrade project, started in mid-2018, it was installed and recommissioned (December 2019) on a different folded-Cassegrain focus providing superior performance with

9021-605: Was bound together by law, language, and the Roman road . The cultures of the pre-Roman populations were gradually Romanised (Latinised) at different rates depending on what part of the peninsula they lived in, with local leaders being admitted into the Roman aristocratic class. Hispania (the Roman name for the Iberian Peninsula) served as a granary for the Roman market, and its harbours exported gold, wool , olive oil , and wine. Agricultural production increased with

9118-521: Was decommissioned as of February 2021. The IAC's OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy), is an imager and spectrograph covering wavelengths from 0.365 to 1.05 μm. It has a field of view (FOV) of 7 × 7 arcmin for direct imaging, and 8 arcmin × 5.2 arcmin for low resolution spectroscopy. For spectroscopy, it offers tunable filters. Spain – in Europe  (green & dark grey) – in

9215-509: Was founded in 1888. In the anarcho-syndicalist trend of the labour movement in Spain, Confederación Nacional del Trabajo was founded in 1910 and Federación Anarquista Ibérica in 1927. Catalanism and Vasquism, alongside other nationalisms and regionalisms in Spain, arose in that period: the Basque Nationalist Party formed in 1895 and Regionalist League of Catalonia in 1901. Political corruption and repression weakened

9312-562: Was not supported by the Western powers due to the British-led policy of non-intervention . General Francisco Franco was sworn in as the supreme leader of the rebels on 1 October 1936. An uneasy relationship between the Republican government and the grassroots anarchists who had initiated a partial social revolution also ensued. The civil war was viciously fought and there were many atrocities committed by all sides . The war claimed

9409-679: Was reunited under Visigothic rule . From 711 to 718, as part of the expansion of the Umayyad Caliphate which had conquered North Africa from the Byzantine Empire , nearly all of the Iberian Peninsula was conquered by Muslims from across the Strait of Gibraltar, resulting in the collapse of the Visigothic Kingdom. Only a small area in the mountainous north of the peninsula stood out of the territory seized during

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