1.
Chladni (crater)
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Chladni is a small lunar impact crater that lies near the northwest edge of Sinus Medii, in the central part of the Moon. The crater is named for German physicist and musician Ernst Chladni who, in 1794, the rim of the crater is roughly circular, and there is a small central floor at the midpoint of the sloping inner walls. This feature has a higher albedo than the surrounding terrain and it is connected by a low ridge to the rim of the crater Murchison, which lies to the northwest. Due east of Chladni is the larger Triesnecker
2.
Wittenberg
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Wittenberg, officially Lutherstadt Wittenberg, is a town in Saxony-Anhalt, Germany. Situated on the river Elbe, it has a population of about 50,000. Part of the Augustinian monastery in which Luther dwelt, first as a monk and later as owner with his wife, various Luther and Melanchthon memorial sites were added to the UNESCO world heritage list in 1996. Historical documents first mention the settlement in 1180 as a village founded by Flemish colonists under the rule of the House of Ascania. In 1260 this village became the residence of the dukes of Saxe-Wittenberg, Wittenberg developed into an important trade centre during the following several centuries, because of its central location. When the local branch of the Ascanians died out in 1422, several parts of boundaries of the town were extended soon afterward. The second bridge over the Elbe River was built from 1486 through 1490, the Electors palace was rebuilt at the same time. In 1760, during the Seven Years War, the Austrians bombarded the Prussian-occupied town, the French took control in 1806, and Napoleon commanded the refortification of the town in 1813. In 1814 the Prussian Army under Tauentzien stormed Wittenberg, he received the title of von Wittenberg as a reward, in 1815 Wittenberg became part of Prussia, administered within the Province of Saxony. Wittenberg continued to be a fortress of the class until the reorganisation of German defences after the foundation of the new German Empire led to its dismantling in 1873. Unlike many other historic German cities during World War II, Wittenbergs town centre was spared destruction during the conflict. In actuality, the Luther statue was not even present in the square during much of the war, but in storage at Luther Brunnen. Wittenbergs reputation as a town protected from Allied bombing is also not entirely historically accurate, on the outskirts of Wittenberg stood the Arado Flugzeugwerke, which produced components of airplanes for the Luftwaffe. This factory was staffed by Jews, Russians, Poles, political prisoners, despite the prisoner status of its workers, American and British planes bombed the factory near the end of the war, killing one thousand prisoner workers. The 1995 publication of. und morgen war Krieg. by Renate Gruber-Lieblich attempts to document this tragic bombing of Wittenberg, at the end of the war, Soviet forces occupied Wittenberg, it became part of East Germany in 1949. During the East German period, it formed part of Halle District, by means of the peaceful revolution in 1989, the communist régime dissolved and the town has been governed democratically since 1990. The figures are given for the district at the point in time. Up to 1791 the figures are estimated, later figures are from census or local authorities
3.
Electorate of Saxony
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Upon the extinction of the House of Ascania, it was enfeoffed to the Margraves of Meissen from the Wettin dynasty in 1423, who moved the residence up the Elbe river to Dresden. After the Empires dissolution in 1806, the Wettin electors raised Saxony to a kingdom, when Emperor Frederick Barbarossa deposed the Saxon duke Henry the Lion in 1180, the Wittenberg lands belonged to Alberts youngest son Count Bernhard of Anhalt, who assumed the Saxon ducal title. Bernards eldest son, Albert I, ceded Anhalt to his younger brother Henry, retained the ducal title and his sons divided the possessions into the duchies of Saxe-Wittenberg and Saxe-Lauenburg. Louis was succeeded by the Luxembourg king Charles of Bohemia, after being crowned Holy Roman Emperor in 1355, Charles issued the Golden Bull of 1356, the fundamental law of the Empire settling the method of electing the German King by seven Prince-electors. In this way, the country, though small in area, the electoral dignity was connected with it the obligation of male primogeniture, that is, only the eldest son could succeed as ruler. This forbade the division of the territory among several heirs, preventing the disintegration of the country, the importance of this stipulation is shown by the history of most of the fragmented German principalities which were not electorates. Late Alberts Ascanian relative Duke Eric V of Saxe-Lauenburg protested in vain, thus, in 1423, Saxe-Wittenberg, the Margraviate of Meissen and Thuringia were united under one ruler, and the unified territory gradually received the name of Saxony. The partition decisively enfeebled the Wettin dynasty in the rivalry with the rising House of Hohenzollern, the Protestant movement of the 16th century was largely effected under the protection of the Saxon rulers. The Elector did not become at once an adherent of the new opinions, owing to his intervention, Pope Leo X decided against summoning Luther to Rome in 1518, and the Elector secured for Luther Imperial safe-conduct to the 1521 Diet of Worms. When Luther was declared to be under the ban of the empire by Emperor Charles V. Lutheran doctrines spread first in Ernestine Saxony, in 1525, Frederick died and was succeeded by his brother, John the Constant. John was followed in 1532 by his son, John Frederick the Magnanimous, in 1542, he seized the Diocese of Naumburg-Zeitz, and confiscated the secular possessions of the Dioceses of Meissen and Hildesheim. The Catholic faith was forcibly suppressed, after the outbreak of the Schmalkaldic War, Elector John Frederick was placed under the Imperial ban and finally defeated and captured by Emperor Charles V at the Battle of Mühlberg on 24 April 1547. In the Capitulation of Wittenberg of May 19, he was obliged to yield former Saxe-Wittenberg with the dignity to his Albertine cousin Duke Maurice. The Saxon Electorate after the Wittenberg Capitulation consisted of former Saxe-Wittenberg and Meissen together, Maurice secretly shared in all the princely conspiracies against the Emperor, who only escaped capture by flight. During the same year, Charles V was obliged by the Peace of Passau to grant freedom of religion to the Protestant Estates, Maurice died in 1553 at the age of 32. His brother and successor Elector Augustus seized the Catholic dioceses of Merseburg, the last Bishop of Merseburg, Michael Helding called Sidonius, died at Vienna in 1561. In the same manner after the death of Julius von Pflug, the last Catholic Bishop of Naumburg, in 1564 and those cathedral canons who were still Catholic were only permitted to exercise their religion for ten years more
4.
Holy Roman Empire
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The Holy Roman Empire was a multi-ethnic complex of territories in central Europe that developed during the Early Middle Ages and continued until its dissolution in 1806. On 25 December 800, Pope Leo III crowned the Frankish king Charlemagne as Emperor, reviving the title in Western Europe, more than three centuries after the fall of the Western Roman Empire. The title was revived in 962 when Otto I was crowned emperor, fashioning himself as the successor of Charlemagne, some historians refer to the coronation of Charlemagne as the origin of the empire, while others prefer the coronation of Otto I as its beginning. Scholars generally concur, however, in relating an evolution of the institutions and principles constituting the empire, the office of Holy Roman Emperor was traditionally elective, although frequently controlled by dynasties. Emperor Francis II dissolved the empire on 6 August 1806, after the creation of the Confederation of the Rhine by Napoleon, before 1157, the realm was merely referred to as the Roman Empire. In a decree following the 1512 Diet of Cologne, the name was changed to Holy Roman Empire of the German Nation, by the end of the 18th century, the term Holy Roman Empire of the German Nation had fallen out of official use. As Roman power in Gaul declined during the 5th century, local Germanic tribes assumed control, by the middle of the 8th century, however, the Merovingians had been reduced to figureheads, and the Carolingians, led by Charles Martel, had become the de facto rulers. In 751, Martel’s son Pepin became King of the Franks, the Carolingians would maintain a close alliance with the Papacy. In 768 Pepin’s son Charlemagne became King of the Franks and began an expansion of the realm. He eventually incorporated the territories of present-day France, Germany, northern Italy, on Christmas Day of 800, Pope Leo III crowned Charlemagne emperor, restoring the title in the west for the first time in over three centuries. After the death of Charles the Fat in 888, however, the Carolingian Empire broke apart, according to Regino of Prüm, the parts of the realm spewed forth kinglets, and each part elected a kinglet from its own bowels. After the death of Charles the Fat, those crowned emperor by the pope controlled only territories in Italy, the last such emperor was Berengar I of Italy, who died in 924. Around 900, autonomous stem duchies reemerged in East Francia, on his deathbed, Conrad yielded the crown to his main rival, Henry the Fowler of Saxony, who was elected king at the Diet of Fritzlar in 919. Henry reached a truce with the raiding Magyars, and in 933 he won a first victory against them in the Battle of Riade, Henry died in 936, but his descendants, the Liudolfing dynasty, would continue to rule the Eastern kingdom for roughly a century. Upon Henry the Fowlers death, Otto, his son and designated successor, was elected King in Aachen in 936 and he overcame a series of revolts from an elder brother and from several dukes. After that, the managed to control the appointment of dukes. In 951, Otto came to the aid of Adelaide, the queen of Italy, defeating her enemies, marrying her. In 955, Otto won a victory over the Magyars in the Battle of Lechfeld
5.
Province of Silesia
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As a Prussian province, Silesia became part of the German Empire during the Prussian-led unification of Germany in 1871. The territory on both sides of the Oder river formed the part of the Prussian kingdom. It furthermore included the part of Upper Lusatia around Görlitz and Lauban. In the northeast, Upper Silesia bordered on remaining Congress Poland, the incorporated Upper Lusatian strip of land in the west touched the remaining territory of the Saxon kingdom. Immediately after the coronation of Maria Theresa as Bohemian queen regnant, King Frederick the Great of Prussia had invaded Silesia, attempts by Maria Theresa to regain the crown land in the Second Silesian War failed and she ultimately had to relinquish her claims by the Treaty of Dresden. As the lands had been part of the Holy Roman Empire until 1806, the character of the provinces eastern third, Upper Silesia, had been much lesser shaped by the medieval German Ostsiedlung. According to the census of 1905, about three-quarters of the Silesian inhabitants were German–speaking, the Upper Silesian Industrial Region was the second largest industrial agglomeration of the German Empire after the Ruhr area. Ethnic tensions rose on the eve of World War I, with politicians like Wojciech Korfanty separating from the Centre Party, after the war, the parts remaining in Weimar Germany were re-organized into the two provinces of Lower Silesia and Upper Silesia in 1919. Further, in 1920 the Hlučín Region was ceded to Czechoslovakia according to the Treaty of Versailles, after the Nazi Germany conquest of Poland in late 1939, the Province of Silesia was extended when a part of Poland was merged into that province. In 1941, the Province was divided again, the German-speaking population left or was expelled following World War II, though a minority remains. A smaller western part of the former Silesia Province lies within modern German states of Saxony, coats of arms of Upper Silesian towns while part of the Province of Silesia Administrative subdivision and population breakdown of the Province of Silesia in 1900/1900
6.
Kingdom of Prussia
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It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg, the kings of Prussia were from the House of Hohenzollern. Prussia was a power from the time it became a kingdom, through its predecessor, Brandenburg-Prussia. Prussia continued its rise to power under the guidance of Frederick II, more known as Frederick the Great. After the might of Prussia was revealed it was considered as a power among the German states. Throughout the next hundred years Prussia went on to win many battles and it was because of its power that Prussia continuously tried to unify all the German states under its rule. Attempts at creation of a federation remained unsuccessful and the German Confederation collapsed in 1866 when war ensued between its two most powerful states, Prussia and Austria. The North German Confederation which lasted from 1867–1871, created a union between the Prussian-aligned states while Austria and most of Southern Germany remained independent. The North German Confederation was seen as more of an alliance of military strength in the aftermath of the Austro-Prussian War, the German Empire lasted from 1871–1918 with the successful unification of all the German states under Prussian hegemony. This was due to the defeat of Napoleon III in the Franco-Prussian War of 1870–71, in 1871, Germany unified into a single country, minus Austria and Switzerland, with Prussia the dominant power. Prussia is considered the predecessor of the unified German Reich. The Kingdom left a significant cultural legacy, today notably promoted by the Prussian Cultural Heritage Foundation, in 1415 a Hohenzollern Burgrave came from the south to the March of Brandenburg and took control of the area as elector. In 1417 the Hohenzollern was made an elector of the Holy Roman Empire, after the Polish wars, the newly established Baltic towns of the German states including Prussia, suffered many economic setbacks. Many of the Prussian towns could not even afford to attend political meetings outside of Prussia, the towns were poverty stricken, with even the largest town, Danzig, having to borrow money from elsewhere to pay for trade. Poverty in these towns was partly caused by Prussias neighbors, who had established and developed such a monopoly on trading that these new towns simply could not compete and these issues led to feuds, wars, trade competition and invasions. However, the fall of these gave rise to the nobility, separated the east and the west. It was clear in 1440 how different Brandenburg was from the other German territories, not only did it face partition from within but also the threat of its neighbors. It prevented the issue of partition by enacting the Dispositio Achillea which instilled the principle of primogeniture to both the Brandenburg and Franconian territories, the second issue was solved through expansion
7.
German Confederation
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Most historians have judged the Confederation to have been weak and ineffective, as well as an obstacle to the creation of a German nation-state. It collapsed due to the rivalry between Prussia and Austria, warfare, the 1848 revolution, and the inability of the members to compromise. In 1848, revolutions by liberals and nationalists were an attempt to establish a unified German state. Talks between the German states failed in 1848, and the Confederation briefly dissolved, but was re-established shortly after and it decidedly fell apart only after the Prussian victory in the Seven Weeks War of 1866. This led to the creation of the North German Confederation under Prussian leadership in 1867, a number of South German states remained independent until they joined the North German Confederation, which was renamed the German Empire. The War of the Third Coalition lasted from about 1803 to 1806, following defeat at the Battle of Austerlitz by the French under Napoleon in December 1805, Holy Roman Emperor Francis II abdicated, and the Empire was dissolved on 6 August 1806. The resulting Treaty of Pressburg established the Confederation of the Rhine in July 1806, after the Battle of Jena–Auerstedt of October 1806 in the War of the Fourth Coalition, various other German states, including Saxony and Westphalia, also joined the Confederation. Only Austria, Prussia, Danish Holstein, Swedish Pomerania and the French-occupied Principality of Erfurt stayed outside the Confederation of the Rhine and these nations would later join in the War of the Sixth Coalition from 1812 to 1814. The German Confederation was created by the 9th Act of the Congress of Vienna on 8 June 1815 after being alluded to in Article 6 of the 1814 Treaty of Paris, ending the War of the Sixth Coalition. The Confederation was formally created by a treaty, the Final Act of the Ministerial Conference to Complete and Consolidate the Organization of the German Confederation. This treaty was not concluded and signed by the parties until 15 May 1820, States joined the German Confederation by becoming parties to the second treaty. The German Confederation ended as a result of the Austro-Prussian War of 1866 between Austrian Empire and its allies on one side and the Kingdom of Prussia and its allies on the other. In the Prague peace treaty, on 23 August 1866, Austria had to accept that the Confederation was considered to be dissolved, the following day, the remaining member states confirmed the dissolution. The treaty allowed Prussia to create a new Bundesverhältnis in the North of Germany, the South German states were proposed to create a South German Confederation but this did not come into existence. Prussia and its allies created the North German Confederation in 1867, because of French intervention it had to exclude, besides Austria, the South German states Bavaria, Württemberg, Baden and Hesse-Darmstadt. During November 1870 the four states joined the North German Confederation by treaty. The North German Confederation Reichstag and Bundesrat accepted to rename the North German Confederation as the German Empire, the new constitution of the state, the Constitution of the German Confederation, introduced the new name and title on 1 January 1871. The Austrian Empire and the Kingdom of Prussia were the largest, Austria and Prussia each had one vote in the Federal Assembly
8.
Germany
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Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of 357,021 square kilometres, with about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular destination in the world. Germanys capital and largest metropolis is Berlin, while its largest conurbation is the Ruhr, other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart, Düsseldorf and Leipzig. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity, a region named Germania was documented before 100 AD. During the Migration Period the Germanic tribes expanded southward, beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation, in 1871, Germany became a nation state when most of the German states unified into the Prussian-dominated German Empire. After World War I and the German Revolution of 1918–1919, the Empire was replaced by the parliamentary Weimar Republic, the establishment of the national socialist dictatorship in 1933 led to World War II and the Holocaust. After a period of Allied occupation, two German states were founded, the Federal Republic of Germany and the German Democratic Republic, in 1990, the country was reunified. In the 21st century, Germany is a power and has the worlds fourth-largest economy by nominal GDP. As a global leader in industrial and technological sectors, it is both the worlds third-largest exporter and importer of goods. Germany is a country with a very high standard of living sustained by a skilled. It upholds a social security and universal health system, environmental protection. Germany was a member of the European Economic Community in 1957. It is part of the Schengen Area, and became a co-founder of the Eurozone in 1999, Germany is a member of the United Nations, NATO, the G8, the G20, and the OECD. The national military expenditure is the 9th highest in the world, the English word Germany derives from the Latin Germania, which came into use after Julius Caesar adopted it for the peoples east of the Rhine. This in turn descends from Proto-Germanic *þiudiskaz popular, derived from *þeudō, descended from Proto-Indo-European *tewtéh₂- people, the discovery of the Mauer 1 mandible shows that ancient humans were present in Germany at least 600,000 years ago. The oldest complete hunting weapons found anywhere in the world were discovered in a mine in Schöningen where three 380, 000-year-old wooden javelins were unearthed
9.
Acoustics
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Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of technology may be called an acoustical engineer. The application of acoustics is present in almost all aspects of society with the most obvious being the audio. Hearing is one of the most crucial means of survival in the animal world, accordingly, the science of acoustics spreads across many facets of human society—music, medicine, architecture, industrial production, warfare and more. Likewise, animal species such as songbirds and frogs use sound, art, craft, science and technology have provoked one another to advance the whole, as in many other fields of knowledge. Robert Bruce Lindsays Wheel of Acoustics is a well accepted overview of the fields in acoustics. The word acoustic is derived from the Greek word ἀκουστικός, meaning of or for hearing, ready to hear and that from ἀκουστός, heard, audible, which in turn derives from the verb ἀκούω, I hear. The Latin synonym is sonic, after which the term used to be a synonym for acoustics. Frequencies above and below the range are called ultrasonic and infrasonic. If, for example, a string of a length would sound particularly harmonious with a string of twice the length. In modern parlance, if a string sounds the note C when plucked, a string twice as long will sound a C an octave lower. In one system of tuning, the tones in between are then given by 16,9 for D,8,5 for E,3,2 for F,4,3 for G,6,5 for A. Aristotle understood that sound consisted of compressions and rarefactions of air which falls upon, a very good expression of the nature of wave motion. The physical understanding of acoustical processes advanced rapidly during and after the Scientific Revolution, mainly Galileo Galilei but also Marin Mersenne, independently, discovered the complete laws of vibrating strings. Experimental measurements of the speed of sound in air were carried out successfully between 1630 and 1680 by a number of investigators, prominently Mersenne, meanwhile, Newton derived the relationship for wave velocity in solids, a cornerstone of physical acoustics. The eighteenth century saw advances in acoustics as mathematicians applied the new techniques of calculus to elaborate theories of sound wave propagation. Also in the 19th century, Wheatstone, Ohm, and Henry developed the analogy between electricity and acoustics, the twentieth century saw a burgeoning of technological applications of the large body of scientific knowledge that was by then in place. The first such application was Sabine’s groundbreaking work in architectural acoustics, Underwater acoustics was used for detecting submarines in the first World War
10.
Ernst Chladni
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Ernst Florens Friedrich Chladni was a German physicist and musician. His most important work, for which he is labeled the father of acoustics, included research on vibrating plates. He also undertook pioneering work in the study of meteorites and so is regarded by some as the father of meteoritics. Although Chladni was born in Wittenberg in Saxony, his family originated from Kremnica, then part of the Kingdom of Hungary, Chladni has therefore been identified as German, Hungarian and Slovak. Chladni came from an family of academics and learned men. Chladnis great-grandfather, the Lutheran clergyman Georg Chladni, had left Kremnica in 1673 during the Counter Reformation, Chladnis grandfather, Martin Chladni, was also a Lutheran theologian and, in 1710, became professor of theology at the University of Wittenberg. He was dean of the faculty in 1720–1721 and later became the universitys rector. Chaldnis uncle, Justus Georg Chladni, was a law professor at the university, another uncle, Johann Martin Chladni, was a theologian, a historian and a professor at the University of Erlangen and the University of Leipzig. Chladnis father, Ernst Martin Chladni, was a law professor and rector of the University of Wittenberg and he had joined the law faculty there in 1746. Chladnis mother was Johanna Sophia and he was an only child and his father disapproved of his sons interest in science and insisted that Chladni become a lawyer. Chladni studied law and philosophy in Wittenberg and Leipzig, obtaining a law degree from the University of Leipzig in 1782 and that same year, his father died and he turned to physics in earnest. One of Chladnis best-known achievements was inventing a technique to show the modes of vibration of a rigid surface. When resonating, a plate or membrane is divided into regions that vibrate in opposite directions, Chladni repeated the pioneering experiments of Robert Hooke who, on July 8,1680, had observed the nodal patterns associated with the vibrations of glass plates. Hooke ran a bow along the edge of a plate covered with flour. Chladnis technique, first published in 1787 in his book Entdeckungen über die Theorie des Klanges, the plate was bowed until it reached resonance, when the vibration causes the sand to move and concentrate along the nodal lines where the surface is still, outlining the nodal lines. The patterns formed by these lines are what are now called Chladni figures, similar nodal patterns can also be found by assembling microscale materials on Faraday waves. When Chladni showed the technique in Paris, Napoleon set a prize for the best mathematical explanation, sophie Germains answer, although rejected due to flaws, was the only entry with the correct approach. Variations of this technique are still used in the design and construction of acoustic instruments such as violins, guitars
11.
Speed of sound
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The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 20 °C, the speed of sound is 343 metres per second, the speed of sound in an ideal gas depends only on its temperature and composition. The speed has a dependence on frequency and pressure in ordinary air. In common everyday speech, speed of sound refers to the speed of waves in air. However, the speed of sound varies from substance to substance, sound travels most slowly in gases, it travels faster in liquids, and faster still in solids. For example, sound travels at 343 m/s in air, it travels at 1,484 m/s in water, in an exceptionally stiff material such as diamond, sound travels at 12,000 m/s, which is around the maximum speed that sound will travel under normal conditions. Sound waves in solids are composed of waves, and a different type of sound wave called a shear wave. Shear waves in solids usually travel at different speeds, as exhibited in seismology, the speed of compression waves in solids is determined by the mediums compressibility, shear modulus and density. The speed of waves is determined only by the solid materials shear modulus. In fluid dynamics, the speed of sound in a medium is used as a relative measure for the speed of an object moving through the medium. The ratio of the speed of an object to the speed of sound in the fluid is called the objects Mach number, objects moving at speeds greater than Mach1 are said to be traveling at supersonic speeds. During the 17th century, there were attempts to measure the speed of sound accurately, including attempts by Marin Mersenne in 1630, Pierre Gassendi in 1635. In 1709, the Reverend William Derham, Rector of Upminster, published an accurate measure of the speed of sound. Measurements were made of gunshots from a number of local landmarks, the distance was known by triangulation, and thus the speed that the sound had travelled was calculated. The transmission of sound can be illustrated by using a model consisting of an array of balls interconnected by springs, for real material the balls represent molecules and the springs represent the bonds between them. Sound passes through the model by compressing and expanding the springs, transmitting energy to neighbouring balls, which transmit energy to their springs, the speed of sound through the model depends on the stiffness of the springs, and the mass of the balls. As long as the spacing of the balls remains constant, stiffer springs transmit energy more quickly, effects like dispersion and reflection can also be understood using this model. In a real material, the stiffness of the springs is called the modulus
12.
Meteorite
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When the object enters the atmosphere, various factors like friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate that energy. It then becomes a meteor and forms a fireball, also known as a shooting/falling star, meteorites that survive atmospheric entry and impact vary greatly in size. For geologists, a bolide is a large enough to create a crater. Meteorites that are recovered after being observed as they transit the atmosphere or impact the Earth are called meteorite falls, all others are known as meteorite finds. As of April 2016, there were about 1,140 witnessed falls that have specimens in the worlds collections, there are more than 38,660 well-documented meteorite finds. Modern classification schemes divide meteorites into groups according to their structure, chemical and isotopic composition, meteorites smaller than 2 mm are classified as micrometeorites. Extraterrestrial meteorites are such objects that have impacted other celestial bodies and they have been found on the Moon and Mars. Meteorites are always named for the places they were found, usually a town or geographic feature. In cases where many meteorites were found in one place, the name may be followed by a number or letter, the name designated by the Meteoritical Society is used by scientists, catalogers, and most collectors. Most meteoroids disintegrate when entering the Earths atmosphere, usually, five to ten a year are observed to fall and are subsequently recovered and made known to scientists. Few meteorites are large enough to create large impact craters, instead, they typically arrive at the surface at their terminal velocity and, at most, create a small pit. Large meteoroids may strike the ground with a significant fraction of their escape velocity, the kind of crater will depend on the size, composition, degree of fragmentation, and incoming angle of the impactor. The force of such collisions has the potential to cause widespread destruction, the most frequent hypervelocity cratering events on the Earth are caused by iron meteoroids, which are most easily able to transit the atmosphere intact. In contrast, even relatively large stony or icy bodies like small comets or asteroids, up to millions of tons, are disrupted in the atmosphere, and do not make impact craters. Although such disruption events are uncommon, they can cause a concussion to occur. Very large stony objects, hundreds of meters in diameter or more, weighing tens of millions of tons or more, can reach the surface and cause large craters, such events are generally so energetic that the impactor is completely destroyed, leaving no meteorites. Several phenomena are well documented during witnessed meteorite falls too small to produce hypervelocity craters, various colors have been reported, including yellow, green, and red. Flashes and bursts of light can occur as the object breaks up, explosions, detonations, and rumblings are often heard during meteorite falls, which can be caused by sonic booms as well as shock waves resulting from major fragmentation events
13.
Physics
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Physics is the natural science that involves the study of matter and its motion and behavior through space and time, along with related concepts such as energy and force. One of the most fundamental disciplines, the main goal of physics is to understand how the universe behaves. Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy, Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the mechanisms of other sciences while opening new avenues of research in areas such as mathematics. Physics also makes significant contributions through advances in new technologies that arise from theoretical breakthroughs, the United Nations named 2005 the World Year of Physics. Astronomy is the oldest of the natural sciences, the stars and planets were often a target of worship, believed to represent their gods. While the explanations for these phenomena were often unscientific and lacking in evidence, according to Asger Aaboe, the origins of Western astronomy can be found in Mesopotamia, and all Western efforts in the exact sciences are descended from late Babylonian astronomy. The most notable innovations were in the field of optics and vision, which came from the works of many scientists like Ibn Sahl, Al-Kindi, Ibn al-Haytham, Al-Farisi and Avicenna. The most notable work was The Book of Optics, written by Ibn Al-Haitham, in which he was not only the first to disprove the ancient Greek idea about vision, but also came up with a new theory. In the book, he was also the first to study the phenomenon of the pinhole camera, many later European scholars and fellow polymaths, from Robert Grosseteste and Leonardo da Vinci to René Descartes, Johannes Kepler and Isaac Newton, were in his debt. Indeed, the influence of Ibn al-Haythams Optics ranks alongside that of Newtons work of the same title, the translation of The Book of Optics had a huge impact on Europe. From it, later European scholars were able to build the devices as what Ibn al-Haytham did. From this, such important things as eyeglasses, magnifying glasses, telescopes, Physics became a separate science when early modern Europeans used experimental and quantitative methods to discover what are now considered to be the laws of physics. Newton also developed calculus, the study of change, which provided new mathematical methods for solving physical problems. The discovery of new laws in thermodynamics, chemistry, and electromagnetics resulted from greater research efforts during the Industrial Revolution as energy needs increased, however, inaccuracies in classical mechanics for very small objects and very high velocities led to the development of modern physics in the 20th century. Modern physics began in the early 20th century with the work of Max Planck in quantum theory, both of these theories came about due to inaccuracies in classical mechanics in certain situations. Quantum mechanics would come to be pioneered by Werner Heisenberg, Erwin Schrödinger, from this early work, and work in related fields, the Standard Model of particle physics was derived. Areas of mathematics in general are important to this field, such as the study of probabilities, in many ways, physics stems from ancient Greek philosophy
14.
Physicist
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A physicist is a scientist who has specialized knowledge in the field of physics, the exploration of the interactions of matter and energy across the physical universe. A physicist is a scientist who specializes or works in the field of physics, physicists generally are interested in the root or ultimate causes of phenomena, and usually frame their understanding in mathematical terms. Physicists can also apply their knowledge towards solving real-world problems or developing new technologies, some physicists specialize in sectors outside the science of physics itself, such as engineering. The study and practice of physics is based on a ladder of discoveries. Many mathematical and physical ideas used today found their earliest expression in ancient Greek culture and Asian culture, the bulk of physics education can be said to flow from the scientific revolution in Europe, starting with the work of Galileo and Kepler in the early 1600s. New knowledge in the early 21st century includes an increase in understanding physical cosmology. The term physicist was coined by William Whewell in his 1840 book The Philosophy of the Inductive Sciences, many physicist positions require an undergraduate degree in applied physics or a related science or a Masters degree like MSc, MPhil, MPhys or MSci. In a research oriented level, students tend to specialize in a particular field, Physics students also need training in mathematics, and also in computer science and programming. For being employed as a physicist a doctoral background may be required for certain positions, undergraduate students like BSc Mechanical Engineering, BSc Electrical and Computer Engineering, BSc Applied Physics. etc. With physics orientation are chosen as research assistants with faculty members, the highest honor awarded to physicists is the Nobel Prize in Physics, awarded since 1901 by the Royal Swedish Academy of Sciences. The three major employers of career physicists are academic institutions, laboratories, and private industries, with the largest employer being the last, physicists in academia or government labs tend to have titles such as Assistants, Professors, Sr. /Jr. As per the American Institute for Physics, some 20% of new physics Ph. D. s holds jobs in engineering development programs, while 14% turn to computer software, a majority of physicists employed apply their skills and training to interdisciplinary sectors. For industry or self-employment. and also in science and programming. Hence a majority of Physics bachelors degree holders are employed in the private sector, other fields are academia, government and military service, nonprofit entities, labs and teaching
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Music
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Music is an art form and cultural activity whose medium is sound organized in time. The common elements of music are pitch, rhythm, dynamics, different styles or types of music may emphasize, de-emphasize or omit some of these elements. The word derives from Greek μουσική, Ancient Greek and Indian philosophers defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as the harmony of the spheres and it is music to my ears point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, There is no noise, the creation, performance, significance, and even the definition of music vary according to culture and social context. There are many types of music, including music, traditional music, art music, music written for religious ceremonies. For example, it can be hard to draw the line between some early 1980s hard rock and heavy metal, within the arts, music may be classified as a performing art, a fine art or as an auditory art. People may make music as a hobby, like a teen playing cello in a youth orchestra, the word derives from Greek μουσική. According to the Online Etymological Dictionary, the music is derived from mid-13c. Musike, from Old French musique and directly from Latin musica the art of music and this is derived from the. Greek mousike of the Muses, from fem. of mousikos pertaining to the Muses, from Mousa Muse. In classical Greece, any art in which the Muses presided, Music is composed and performed for many purposes, ranging from aesthetic pleasure, religious or ceremonial purposes, or as an entertainment product for the marketplace. With the advent of recording, records of popular songs. Some music lovers create mix tapes of their songs, which serve as a self-portrait. An environment consisting solely of what is most ardently loved, amateur musicians can compose or perform music for their own pleasure, and derive their income elsewhere. Professional musicians sometimes work as freelancers or session musicians, seeking contracts and engagements in a variety of settings, There are often many links between amateur and professional musicians. Beginning amateur musicians take lessons with professional musicians, in community settings, advanced amateur musicians perform with professional musicians in a variety of ensembles such as community concert bands and community orchestras. However, there are many cases where a live performance in front of an audience is also recorded and distributed. Live concert recordings are popular in classical music and in popular music forms such as rock, where illegally taped live concerts are prized by music lovers
16.
Oscillation
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Oscillation is the repetitive variation, typically in time, of some measure about a central value or between two or more different states. The term vibration is used to describe mechanical oscillation. Familiar examples of oscillation include a swinging pendulum and alternating current power, the simplest mechanical oscillating system is a weight attached to a linear spring subject to only weight and tension. Such a system may be approximated on an air table or ice surface, the system is in an equilibrium state when the spring is static. If the system is displaced from the equilibrium, there is a net restoring force on the mass, tending to bring it back to equilibrium. However, in moving the back to the equilibrium position, it has acquired momentum which keeps it moving beyond that position. If a constant force such as gravity is added to the system, the time taken for an oscillation to occur is often referred to as the oscillatory period. All real-world oscillator systems are thermodynamically irreversible and this means there are dissipative processes such as friction or electrical resistance which continually convert some of the energy stored in the oscillator into heat in the environment. Thus, oscillations tend to decay with time there is some net source of energy into the system. The simplest description of this process can be illustrated by oscillation decay of the harmonic oscillator. In addition, a system may be subject to some external force. In this case the oscillation is said to be driven, some systems can be excited by energy transfer from the environment. This transfer typically occurs where systems are embedded in some fluid flow, at sufficiently large displacements, the stiffness of the wing dominates to provide the restoring force that enables an oscillation. The harmonic oscillator and the systems it models have a degree of freedom. More complicated systems have more degrees of freedom, for two masses and three springs. In such cases, the behavior of each variable influences that of the others and this leads to a coupling of the oscillations of the individual degrees of freedom. For example, two pendulum clocks mounted on a wall will tend to synchronise. This phenomenon was first observed by Christiaan Huygens in 1665, more special cases are the coupled oscillators where energy alternates between two forms of oscillation
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Gas
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Gas is one of the four fundamental states of matter. A pure gas may be made up of atoms, elemental molecules made from one type of atom. A gas mixture would contain a variety of pure gases much like the air, what distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer, the interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam, the gaseous state of matter is found between the liquid and plasma states, the latter of which provides the upper temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases which are gaining increasing attention, high-density atomic gases super cooled to incredibly low temperatures are classified by their statistical behavior as either a Bose gas or a Fermi gas. For a comprehensive listing of these states of matter see list of states of matter. The only chemical elements which are stable multi atom homonuclear molecules at temperature and pressure, are hydrogen, nitrogen and oxygen. These gases, when grouped together with the noble gases. Alternatively they are known as molecular gases to distinguish them from molecules that are also chemical compounds. The word gas is a neologism first used by the early 17th-century Flemish chemist J. B. van Helmont, according to Paracelsuss terminology, chaos meant something like ultra-rarefied water. An alternative story is that Van Helmonts word is corrupted from gahst and these four characteristics were repeatedly observed by scientists such as Robert Boyle, Jacques Charles, John Dalton, Joseph Gay-Lussac and Amedeo Avogadro for a variety of gases in various settings. Their detailed studies ultimately led to a relationship among these properties expressed by the ideal gas law. Gas particles are separated from one another, and consequently have weaker intermolecular bonds than liquids or solids. These intermolecular forces result from interactions between gas particles. Like-charged areas of different gas particles repel, while oppositely charged regions of different gas particles attract one another, transient, randomly induced charges exist across non-polar covalent bonds of molecules and electrostatic interactions caused by them are referred to as Van der Waals forces. The interaction of these forces varies within a substance which determines many of the physical properties unique to each gas. A comparison of boiling points for compounds formed by ionic and covalent bonds leads us to this conclusion, the drifting smoke particles in the image provides some insight into low pressure gas behavior
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Kremnica
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Kremnica is a town in central Slovakia. The well-preserved medieval town built above important gold mines is the site of the oldest still-working mint in the world, the name is derived from Slovak kremeň, kremenina with a femine suffix -ica, functioning to create local names. Kremnica was among the mining towns of the world during the Middle Ages. However, the first evidence of mining activities comes from the 9th century. In the 13th century the inhabitants of this area were affected by the invasion of the Mongols, following that difficult period, Hungarian kings invited new colonists from Germany to settle in the region to help replenish the decimated population. They went on to restore the mining activities in the town, the first written reference to the town dates back to 1328, when it was granted royal town privileges by King Charles I of Hungary. The towns mint was already in existence at the time of the granting of royal privileges, starting in 1335 the mint produced golden florins and later the famous Kremnica ducats, which were used as an international means of payment as a result of their consistently high purity of gold. In 1331, Kremnica became the seat of the Chamber Count who was the head of the most important mining and minting chamber of the Kingdom of Hungary, the Count administered all the mines and mints in twelve counties of the kingdom in the Middle Ages. At the end of the 14th century, Kremnica became the capital of the towns in central Upper Hungary. The steady annual production of gold and silver guaranteed the prosperous development of the town, in the 15th century Kreminca was the second most important city in the Kingdom of Hungary. The town was continuously being granted new privileges and the deputies of the town occupied the place in the Hungarian Diet. Gold mining and coin production in Kremnica culminated in the 14th and 15th centuries, in the 16th century, the town was a major centre of production of medals, especially by Joachim Deschler. At the same however, the miners had to dig deeper and deeper to reach new deposits. The cost of mining increased and the mining was becoming less profitable, the last gold was extracted in Kremnica in 1970, at which time all the mines were closed. Kremnica lies at an altitude of 564 metres above sea level and it is located in the Kremnica Mountains on the brook Kremnický potok, which is a tributary of the Hron River. It is located around 20 kilometres west of Banská Bystrica,45 kilometres south of Martin, the castle built in the 13th through 15th centuries towers over the town. In the first half of the 14th century, it became the residence of the Chamber Count, the town was immediately fortified with a double wall containing several bastions and towers. The castle represents an example of a very well preserved fortification system in Central Europe
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Kingdom of Hungary
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The Kingdom of Hungary was a monarchy in Central Europe that existed from the Middle Ages into the twentieth century. The Principality of Hungary emerged as a Christian kingdom upon the coronation of the first king Stephen I at Esztergom in about the year 1000, by the 12th century, the kingdom became a European middle power within the Western world. The House of Habsburg held the Hungarian throne after the Battle of Mohács until 1918, from 1867 territories connected to the Hungarian crown were incorporated into Austria-Hungary under the name of Lands of the Crown of Saint Stephen. The monarchy ended with the deposition of the last king Charles IV in 1918, the kingdom was nominally restored during the Regency of 1920–46, ending with the Soviet occupation in 1946. From 1102 it also included Croatia, being in union with it. Today, the feast day of the first king Stephen I is a holiday in Hungary. The Latin forms Regnum Hungariae or Ungarie, Regnum Marianum, or simply Hungaria, were the used in official documents in Latin from the beginning of the kingdom to the 1840s. The German name Königreich Ungarn was used officially from 1784 to 1790, the Hungarian name was used in the 1840s, and then again from the 1860s to 1946. The non-official Hungarian name of the kingdom was Magyarország, which is still the colloquial, in Austria-Hungary, the unofficial name Transleithania was sometimes used to denote the regions of the Kingdom of Hungary. Officially, the term Lands of the Crown of Saint Stephen was included for the Hungarian part of Austria-Hungary, the Hungarians led by Árpád settled the Carpathian Basin in 895, established Principality of Hungary. The Hungarians led several successful incursions to Western Europe, until they were stopped by Otto I, the principality was succeeded by the Christian Kingdom of Hungary with the coronation of St Stephen I at Esztergom on Christmas Day 1000. The first kings of the kingdom were from the Árpád dynasty and he fought against Koppány and in 998, with Bavarian help, defeated him near Veszprém. The Catholic Church received powerful support from Stephen I, who with Christian Hungarians, Stephen I of Hungary was canonized as a Catholic saint in 1083 and an Orthodox saint in 2000. After his death, a period of revolts and conflict for supremacy ensued between the royalty and the nobles, in 1051 armies of the Holy Roman Empire tried to conquer Hungary, but they were defeated at Vértes Mountain. The armies of the Holy Roman Empire continued to suffer defeats, before 1052 Peter Orseolo, a supporter of the Holy Roman Empire, was overthrown by king Samuel Aba of Hungary. This period of revolts ended during the reign of Béla I, Hungarian chroniclers praised Béla I for introducing new currency, such as the silver denarius, and for his benevolence to the former followers of his nephew, Solomon. The second greatest Hungarian king, also from the dynasty, was Ladislaus I of Hungary. He was also canonized as a saint, however, kingship over all of Croatia would not be achieved until the reign of his successor Coloman
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Slovakia
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Slovakia, officially the Slovak Republic, is a landlocked country in Central Europe. It is bordered by the Czech Republic and Austria to the west, Poland to the north, Ukraine to the east, Slovakias territory spans about 49,000 square kilometres and is mostly mountainous. The population is over 5 million and comprises mostly ethnic Slovaks, the capital and largest city is Bratislava. The Slavs arrived in the territory of present-day Slovakia in the 5th and 6th centuries, in the 7th century, they played a significant role in the creation of Samos Empire and in the 9th century established the Principality of Nitra. In the 10th century, the territory was integrated into the Kingdom of Hungary, which became part of the Habsburg Empire. After World War I and the dissolution of the Austro-Hungarian Empire, a separate Slovak Republic existed in World War II as a client state of Nazi Germany. In 1945, Czechoslovakia was reëstablished under Communist rule as a Soviet satellite, in 1989 the Velvet Revolution ended authoritarian Communist rule in Czechoslovakia. Slovakia became an independent state on 1 January 1993 after the dissolution of Czechoslovakia. The country maintains a combination of economy with universal health care. The country joined the European Union in 2004 and the Eurozone on 1 January 2009, Slovakia is also a member of the Schengen Area, NATO, the United Nations, the OECD, the WTO, CERN, the OSCE, the Council of Europe and the Visegrád Group. The Slovak economy is one of the fastest growing economies in Europe and its legal tender, the Euro, is the worlds 2nd most traded currency. Although regional income inequality is high, 90% of citizens own their homes, in 2016, Slovak citizens had visa-free or visa-on-arrival access to 165 countries and territories, ranking the Slovak passport 11th in the world. Slovakia is the world’s biggest per-capita car producer with a total of 1,040,000 cars manufactured in the country in 2016 alone, the car industry represents 43 percent of Slovakia’s industrial output, and a quarter of its exports. Radiocarbon datingputs the oldest surviving archaeological artefacts from Slovakia – found near Nové Mesto nad Váhom – at 270,000 BC and these ancient tools, made by the Clactonian technique, bear witness to the ancient habitation of Slovakia. Other stone tools from the Middle Paleolithic era come from the Prévôt cave near Bojnice, the most important discovery from that era is a Neanderthal cranium, discovered near Gánovce, a village in northern Slovakia. The most well-known finds include the oldest female statue made of mammoth-bone, the statue was found in the 1940s in Moravany nad Váhom near Piešťany. Numerous necklaces made of shells from Cypraca thermophile gastropods of the Tertiary period have come from the sites of Zákovská, Podkovice, Hubina and these findings provide the most ancient evidence of commercial exchanges carried out between the Mediterranean and Central Europe. The Bronze Age in the territory of modern-day Slovakia went through three stages of development, stretching from 2000 to 800 BC
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Germans
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Germans are a Germanic ethnic group native to Central Europe, who share a common German ancestry, culture and history. German is the mother tongue of a substantial majority of ethnic Germans. The English term Germans has historically referred to the German-speaking population of the Holy Roman Empire since the Late Middle Ages, before the collapse of communism and the reunification of Germany in 1990, Germans constituted the largest divided nation in Europe by far. Ever since the outbreak of the Protestant Reformation within the Holy Roman Empire, of approximately 100 million native speakers of German in the world, roughly 80 million consider themselves Germans. Thus, the number of Germans lies somewhere between 100 and more than 150 million, depending on the criteria applied. Today, people from countries with German-speaking majorities most often subscribe to their own national identities, the German term Deutsche originates from the Old High German word diutisc, referring to the Germanic language of the people. It is not clear how commonly, if at all, the word was used as an ethnonym in Old High German, used as a noun, ein diutscher in the sense of a German emerges in Middle High German, attested from the second half of the 12th century. The Old French term alemans is taken from the name of the Alamanni and it was loaned into Middle English as almains in the early 14th century. The word Dutch is attested in English from the 14th century, denoting continental West Germanic dialects, while in most Romance languages the Germans have been named from the Alamanni, the Old Norse, Finnish and Estonian names for the Germans were taken from that of the Saxons. In Slavic languages, the Germans were given the name of němьci, originally with a meaning foreigner, the English term Germans is only attested from the mid-16th century, based on the classical Latin term Germani used by Julius Caesar and later Tacitus. It gradually replaced Dutch and Almains, the latter becoming mostly obsolete by the early 18th century, the Germans are a Germanic people, who as an ethnicity emerged during the Middle Ages. Originally part of the Holy Roman Empire, around 300 independent German states emerged during its decline after the Peace of Westphalia in 1648 ending the Thirty Years War and these states eventually formed into modern Germany in the 19th century. The concept of a German ethnicity is linked to Germanic tribes of antiquity in central Europe, the early Germans originated on the North German Plain as well as southern Scandinavia. By the 2nd century BC, the number of Germans was significantly increasing and they began expanding into eastern Europe, during antiquity these Germanic tribes remained separate from each other and did not have writing systems at that time. In the European Iron Age the area that is now Germany was divided into the La Tène horizon in Southern Germany and the Jastorf culture in Northern Germany. By 55 BC, the Germans had reached the Danube river and had either assimilated or otherwise driven out the Celts who had lived there, and had spread west into what is now Belgium and France. Conflict between the Germanic tribes and the forces of Rome under Julius Caesar forced major Germanic tribes to retreat to the east bank of the Rhine, in Roman-held territories with Germanic populations, the Germanic and Roman peoples intermarried, and Roman, Germanic, and Christian traditions intermingled. The adoption of Christianity would later become an influence in the development of a common German identity
22.
Hungarians
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Hungarians, also known as Magyars, are a nation and ethnic group who speak Hungarian and are primarily associated with Hungary. There are around 13. 1–14.7 million Hungarians, of whom 8. 5–9.8 million live in todays Hungary, the Hungarians own ethnonym to denote themselves in the Early Middle Ages is uncertain. The Magyars/Hungarians probably belonged to the Onogur tribal alliance, and it is possible that they became its ethnic majority, in the Early Middle Ages the Hungarians had many names, including Ungherese, Ungar, and Hungarus. The H- prefix is an addition of Medieval Latin, another possible explanation comes from the Old Russian Yugra. It may refer to the Hungarians during a time when they dwelt east of the Ural Mountains along the borders of Europe. The Hungarian people refer to themselves by the demonym Magyar rather than Hungarian, Magyar is Finno-Ugric from the Old Hungarian mogyër. Magyar possibly derived from the name of the most prominent Hungarian tribe, the tribal name Megyer became Magyar in reference to the Hungarian people as a whole. Magyar may also derive from the Hunnic Muageris or Mugel, the Greek cognate of Tourkia was used by the scholar and Byzantine Emperor Constantine VII Porphyrogenitus in his De Administrando Imperio of c. AD950, though in his use, Turks always referred to Magyars, the historical Latin phrase Natio Hungarica had a wider meaning because it once referred to all nobles of the Kingdom of Hungary, regardless of their ethnicity. During the 4th millennium BC, the Uralic-speaking peoples who were living in the central, some dispersed towards the west and northwest and came into contact with Iranian speakers who were spreading northwards. From at least 2000 BC onwards, the Ugrian speakers became distinguished from the rest of the Uralic community, judging by evidence from burial mounds and settlement sites, they interacted with the Indo-Iranian Andronovo culture. In the 4th and 5th centuries AD, the Hungarians moved from the west of the Ural Mountains to the area between the southern Ural Mountains and the Volga River known as Bashkiria and Perm Krai. In the early 8th century, some of the Hungarians moved to the Don River to an area between the Volga, Don and the Seversky Donets rivers, meanwhile, the descendants of those Hungarians who stayed in Bashkiria remained there as late as 1241. The Hungarians around the Don River were subordinates of the Khazar khaganate and their neighbours were the archaeological Saltov Culture, i. e. Bulgars and the Alans, from whom they learned gardening, elements of cattle breeding and of agriculture. Tradition holds that the Hungarians were organized in a confederacy of seven tribes, the names of the seven tribes were, Jenő, Kér, Keszi, Kürt-Gyarmat, Megyer, Nyék, and Tarján. Around 830, a rebellion broke out in the Khazar khaganate, as a result, three Kabar tribes of the Khazars joined the Hungarians and moved to what the Hungarians call the Etelköz, the territory between the Carpathians and the Dnieper River. The Hungarians faced their first attack by the Pechenegs around 854, the new neighbours of the Hungarians were the Varangians and the eastern Slavs. In 895/896, under the leadership of Árpád, some Hungarians crossed the Carpathians, the tribe called Magyar was the leading tribe of the Hungarian alliance that conquered the centre of the basin
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Slovaks
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The Slovaks or Slovak people are a nation and West Slavic ethnic group native to Slovakia who share a common ancestry, culture, history and are native speakers of the Slovak language. Most Slovaks today live within the borders of the independent Slovakia, there are Slovak minorities in Czech Republic, Croatia, Poland, Hungary, Serbia and sizeable populations of immigrants and their descendants in the United States, Canada and the United Kingdom. The name Slovak is derived from *Slověninъ, plural *Slověně, the old name of the Slavs, in the Slovak language, only the masculine noun Slověninъ, Slověn changed to Slovän, Slovan and finally to Slovák around 1400. The older form Sloven is preserved in all words in the Slovak language – the adjective Slovak is still slovenský, the feminine noun Slovak is still Slovenka. In 1029 St. Emeric, ruler of the Nitrian principality is called Henricus dux Sclavonie, in 1113 Nestor calls the territory of Slovakia - Slověnskaja zemlja. The first written mention about usage of the new form Slovak in the territory of present-day Slovakia is from Bardejov – Nicoulaus Cossibor hauptman, Nicolaus Czech et Slowak, the mentions in Czech sources are older –1375 and 1385. The change is not related to ethnogenesis of Slovaks, but exclusively to linguistic changes in the West Slavic languages, the word Slovak was also used later as a common name for all Slavs in Czech, Polish and also Slovak language in parallel with other forms. The Slovaks and Slovenes are the only current Slavic nations that have preserved the original name, for Slovenes, the adjective is still slovenski and the feminine noun Slovene is still also Slovenka, but the masculine noun has since changed to Slovenec. The Slovak name for their language is slovenčina and the Slovene name for theirs is slovenščina, the Slovak term for the Slovene language is slovinčina, and the Slovenes call Slovak slovaščina. The name is derived from proto-Slavic form slovo word, talk, thus Slovaks as well as Slovenians would mean people who speak, i. e. people who understand each other. In Hungarian Slovak is Tót, an exonym and it was originally used to refer to all Slavs including Slovenes and Croats, but eventually came to refer primarily to Slovaks. Many place names in Hungary such as Tótszentgyörgy, Tótszentmárton, tóth is a common Hungarian surname. The Slovaks have also historically been referred to as Slovyenyn, Slowyenyny, Sclavus, Sclavi, Slavus, Slavi, Winde, Wende. The final three terms are variations of the Germanic term Wends, which was used to refer to any Slavs living close to Germanic settlements. The early Slavs came to the territory of Slovakia in several waves from the 5th and 6th centuries and were organized on a tribal level, original tribal names are not known due to the lack of written sources before their integration into higher political units. In the 7th century, Slavs founded larger tribal union, Samos empire, regardless of Samos empire, the integration process continued in other territories with various intensities. The final fall of the Avar Khaganate allowed new political entities to arise, the first such political unit documented by written sources is the Principality of Nitra, one of the foundations of later common ethnic consciousness. At this stage in history it is not yet possible to assume a common identity of all Slovak ancestors in the territory of eastern Slovakia, the Principality of Nitra become a part of Great Moravia, a common state of Moravians and Slovaks
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Lutheranism
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Lutheranism is a major branch of Protestant Christianity which identifies with the theology of Martin Luther, a German friar, ecclesiastical reformer and theologian. Luthers efforts to reform the theology and practice of the Catholic Church launched the Protestant Reformation in the German-speaking territories of the Holy Roman Empire. Lutheranism advocates a doctrine of justification by grace alone through faith alone on the basis of Scripture alone and this is in contrast to the belief of the Catholic Church, defined at the Council of Trent, concerning authority coming from both the Scriptures and Tradition. In addition, Lutheranism accepts the teachings of the first seven ecumenical councils of the undivided Christian Church, unlike Calvinism, Lutherans retain many of the liturgical practices and sacramental teachings of the pre-Reformation Church, with a particular emphasis on the Eucharist, or Lords Supper. Lutheran theology differs from Reformed theology in Christology, the purpose of Gods Law, the grace, the concept of perseverance of the saints. Today, Lutheranism is one of the largest denominations of Protestantism, with approximately 80 million adherents, it constitutes the third most common Protestant denomination after historically Pentecostal denominations and Anglicanism. The Lutheran World Federation, the largest communion of Lutheran churches, Other Lutheran organizations include the International Lutheran Council and the Confessional Evangelical Lutheran Conference, as well as independent churches. The name Lutheran originated as a term used against Luther by German Scholastic theologian Dr. Johann Maier von Eck during the Leipzig Debate in July 1519. Eck and other Catholics followed the practice of naming a heresy after its leader. Martin Luther always disliked the term Lutheran, preferring the term Evangelical, which was derived from euangelion, the followers of John Calvin, Huldrych Zwingli, and other theologians linked to the Reformed tradition also began to use that term. To distinguish the two groups, others began to refer to the two groups as Evangelical Lutheran and Evangelical Reformed. As time passed by, the word Evangelical was dropped, Lutherans themselves began to use the term Lutheran in the middle of the 16th century, in order to distinguish themselves from other groups such as the Philippists and Calvinists. In 1597, theologians in Wittenberg defined the title Lutheran as referring to the true church, Lutheranism has its roots in the work of Martin Luther, who sought to reform the Western Church to what he considered a more biblical foundation. Lutheranism spread through all of Scandinavia during the 16th century, as the monarch of Denmark–Norway, through Baltic-German and Swedish rule, Lutheranism also spread into Estonia and Latvia. Since 1520, regular Lutheran services have been held in Copenhagen, under the reign of Frederick I, Denmark-Norway remained officially Catholic. Although Frederick initially pledged to persecute Lutherans, he adopted a policy of protecting Lutheran preachers and reformers. During Fredericks reign, Lutheranism made significant inroads in Denmark, at an open meeting in Copenhagen attended by the king in 1536, the people shouted, We will stand by the holy Gospel, and do not want such bishops anymore. Fredericks son Christian was openly Lutheran, which prevented his election to the throne upon his fathers death, however, following his victory in the civil war that followed, in 1537 he became Christian III and advanced the Reformation in Denmark-Norway
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Theology
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Theology is the critical study of the nature of the divine. It is taught as a discipline, typically in universities, seminaries. Augustine of Hippo defined the Latin equivalent, theologia, as reasoning or discussion concerning the Deity, the term can, however, be used for a variety of different disciplines or fields of study. Theologians use various forms of analysis and argument to help understand, explain, test, critique, the English equivalent theology had evolved by 1362. Greek theologia was used with the discourse on god in the fourth century BC by Plato in The Republic, Book ii. Drawing on Greek Stoic sources, the Latin writer Varro distinguished three forms of discourse, mythical, rational and civil. Theologos, closely related to theologia, appears once in some manuscripts, in the heading to the book of Revelation, apokalypsis ioannoy toy theologoy. The Latin author Boethius, writing in the early 6th century, used theologia to denote a subdivision of philosophy as a subject of study, dealing with the motionless. Boethius definition influenced medieval Latin usage, Theology can also now be used in a derived sense to mean a system of theoretical principles, an ideology. They suggest the term is appropriate in religious contexts that are organized differently. Kalam. does not hold the place in Muslim thought that theology does in Christianity. To find an equivalent for theology in the Christian sense it is necessary to have recourse to several disciplines, and to the usul al-fiqh as much as to kalam. Jose Ignacio Cabezon, who argues that the use of theology is appropriate, can only do so, he says, I take theology not to be restricted to its etymological meaning. In that latter sense, Buddhism is of course atheological, rejecting as it does the notion of God, within Hindu philosophy, there is a solid and ancient tradition of philosophical speculation on the nature of the universe, of God and of the Atman. The Sanskrit word for the schools of Hindu philosophy is Darshana. Nevertheless, Jewish theology historically has been active and highly significant for Christian. It is sometimes claimed, however, that the Jewish analogue of Christian theological discussion would more properly be Rabbinical discussion of Jewish law, the history of the study of theology in institutions of higher education is as old as the history of such institutions themselves. Modern Western universities evolved from the institutions and cathedral schools of Western Europe during the High Middle Ages
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Martin Luther University of Halle-Wittenberg
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The Martin Luther University of Halle-Wittenberg, also referred to as MLU, is a public, research-oriented university in the cities of Halle and Wittenberg within Saxony-Anhalt, Germany. MLU offers German and international courses leading to academic degrees such as B. A. B. Sc, the university was created in 1817 through the merger of the University of Wittenberg and the University of Halle. The university is named after the Protestant reformer Martin Luther, who was a professor in Wittenberg, today, the university itself is located in Halle, while the Leucorea Foundation in Wittenberg serves as MLU’s convention centre for seminars as well as for academic and political conferences. Both Halle and Wittenberg are about one hour from Berlin via the Berlin–Halle railway, the University of Wittenberg was founded in 1502 by Frederick the Wise, Elector of Saxony. Notable attendees include George Müller, Georg Joachim Rheticus and – in fiction – William Shakespeares Prince Hamlet and Horatio, the University of Halle was founded in 1694 by Frederick III, Elector of Brandenburg, who became Frederick I, King in Prussia, in 1701. In the late 17th century and early 18th century, Halle became a centre for Pietism within Prussia, in the 17th and 18th centuries the universities were centers of the German Enlightenment. Christian Wolff was an important proponent of rationalism and he influenced many German scholars, such as Immanuel Kant. Christian Thomasius was at the time the first philosopher in Germany to hold his lectures not in Latin. He contributed to a programme in philosophy but also tried to establish a more common-sense point of view. The University of Wittenberg was closed in 1813 during the Napoleonic Wars, the town of Wittenberg was granted to Prussia in the Congress of Vienna in 1815, and the university was then merged with the Prussian University of Halle in 1817. It took its present name on 10 November 1933, more than a dozen professors were expelled. MLUs historical observatory, built in 1788 by Carl Gotthard Langhans, members are mostly gifted students of all faculties, but also academic staff and alumni. The university choir regularly performs at the international Handel Festival in George Frideric Handel’s birthplace, C. D. Wyneken, Z, Paul Zarifopol, Caspar Ziegler, Karl Ziegler, Nicolaus Ludwig Zinzendorf, Max Zorn, Leopold Zunz. List of early modern universities in Europe The New Encyclopædia Britannica, Official website Official website Download MLU Yearbook 2007 /
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Rector (academia)
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A rector is a term used in non-English-speaking countries for a university chancellor. In the sphere of academia, it is the highest academic official of universities and in certain other institutions of higher education. The term and office of a rector are called a rectorate, the title is used widely in universities in Europe. And is very common in Latin American countries and it is also used in Brunei, Turkey, Russia, Pakistan, the Philippines, Indonesia, Israel and the Middle East. In some universities, the title is phrased in an even loftier manner and this term is generally not used in English-speaking countries. In England and elsewhere in Great Britain, the head of a university is referred to as a chancellor. This pattern has been followed in the Commonwealth, the United States, in Scotland, many universities are headed by a chancellor, with the Lord Rector designated as an elected representative of students at the head of the university court. The head of a university in Germany is called a president, rector magnificus or rectrix magnifica, in Dutch universities, the rector magnificus is the most publicly prominent member of the board, responsible for the scientific agenda of the university. In the Netherlands, the rector is, however, not the chair of the university board, the chair has, in practice, the most influence over the management of the University. In some countries, including Germany, the position of teacher in secondary schools is also designated as rector. In the Netherlands, the rector and conrector are used commonly for high school directors. This is also the case in some Maltese secondary schools, in the Scandinavian countries, the head of a university or a gymnasium is called a rektor. In Sweden and Norway, this term is used for the heads of primary schools. For example, in Portugal, the rector of the University of Coimbra, the heads of Czech universities are called the rektor. The rector acts in the name of the university and decides the universitys affairs unless prohibited by law, the rector is nominated by the University Academic Senate and appointed by the President of the Czech Republic. The nomination must be agreed by a majority of all senators. The vote to elect or repeal a rector is secret, the term of office is four years and a person may hold it for at most two consecutive terms. The rector appoints vice-rectors, who act as deputies to the extent the Rector determines, Rectors salaries are determined directly by the Minister of Education
28.
University of Erlangen-Nuremberg
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Friedrich-Alexander University Erlangen-Nürnberg is a public research university in the cities of Erlangen and Nuremberg in Bavaria, Germany. In Germany, traditional liberal arts universities do not usually have a school or department. However, FAU does have an engineering faculty. FAU is the second largest state university in the state Bavaria and it has 5 faculties,23 departments/schools,30 clinical departments,19 autonomous departments,656 professors,3,404 members of academic staff and roughly 13,000 employees. In winter semester 2014/15 around 39,085 students enrolled in the university in 239 fields of study, with about 2/3 studying at the Erlangen campus and these statistics put FAU in the list of top 10 largest universities in Germany. In 2013,5251 students graduated from the university and 663 doctorates and 50 post-doctoral theses were registered, moreover, FAU received 171 million Euro external funding in the same year, making it one of the strongest third-party funded universities in Germany. In 2006 and 2007, as part of the national excellence initiative, FAU is also a member of DFG and the Top Industrial Managers for Europe network. The university was founded in 1742, in Bayreuth by Frederick, Margrave of Brandenburg-Bayreuth, Christian Frederick Charles Alexander, Margrave of Brandenburg-Ansbach provided significant support to the early university. From the beginning, the university was a Protestant institution, during the Nazi era, the university was one of the first that had a majority of Nazi supporters in the student council. In 1961, the college in Nuremberg was merged with the university in Erlangen. An engineering school was inaugurated in 1966, in 1972, the school of education in Nuremberg became part of the university. Below is a timeline of FAU from its inception to its present form, 1700–1704. 1743, Friedrich, Margrave of Brandenburg-Bayreuth, issues an edict whereby the university founded in Bayreuth is transferred to Erlangen. It has the four faculties of Protestant Theology, Jurisprudence, Medicine,1769, The University at Erlangen is given the new name of Friedrich-Alexander-Universität in honour of Alexander, Margrave of Ansbach and Bayreuth. 1818, The library of the University of Altdorf, dissolved in 1809, is moved to Erlangen,1824, The first hospital is built. 1825, The University moves into the Schloss,1927, Science is taken out of the Faculty of Arts thus creating the new Faculty of Science. 1961, The FAU acquires a further faculty through merger with the Nuremberg College of Economics, the Universitys name is now Friedrich-Alexander University Erlangen-Nürnberg. 1966, Faculty of Engineering is established,1972, The Teacher Training College in Nuremberg is incorporated into the Faculty of Education
29.
Leipzig University
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Leipzig University, in Leipzig in the Free State of Saxony, Germany, is one of the worlds oldest universities and the second-oldest university in Germany. Famous alumni include Leibniz, Goethe, Ranke, Nietzsche, Wagner, Angela Merkel, Raila Odinga, Tycho Brahe, and nine Nobel laureates are associated with the university. The university was founded on December 2,1409 by Frederick I, Elector of Saxony and his brother William II, Margrave of Meissen, since its inception, the university has engaged in teaching and research for over 600 years without interruption. The university was modelled on the University of Prague, from which the German-speaking faculty members withdrew to Leipzig after the Jan Hus crisis, the Alma mater Lipsiensis opened in 1409, after it had been officially endorsed by Pope Alexander V in his Bull of Acknowledgment on. Its first rector was Johann von Münsterberg, from its foundation, the Paulinerkirche served as the university church. After the Reformation, the church and the buildings were donated to the university in 1544. As many European universities, the university of Leipzig was structured into colleges responsible for organising accommodation, among the colleges of Leipzig were the Small College, the Large College, the Red College, the College of our Lady and the Pauliner-College. There were also private residential halls, the colleges had jurisdiction over their members. The college structure was abandoned later and today only the names survive, during the first centuries, the university grew slowly and was a rather regional institution. This changed, however, during the 19th century when the university became an institution of higher education. At the end of the 19th century, important scholars such as Bernhard Windscheid, Leipzig University was one of the first German universities to allow women to register as guest students. At its general assembly in 1873, the Allgemeiner Deutscher Frauenverein thanked the University of Leipzig and this was the year that the first woman in Germany obtained her JD, Johanna von Evreinov. Many of the alumni became important scientists. Under Nazi rule many Jews degrees were cancelled, some were reinstated as Karl-Marx University degrees by the GDR. The university was open throughout World War II, even after the destruction of its buildings. After the destruction of most of the buildings and the majority of its libraries and this is what must be preserved as the great repository of value in the university. By the end of the war 60 per cent of the buildings and 70 per cent of its books had been destroyed. The university reopened after the war on February 5,1946, in 1948 the freely elected student council was disbanded and replaced by Free German Youth members
30.
Normal mode
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A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation. The free motion described by the normal modes takes place at the fixed frequencies and these fixed frequencies of the normal modes of a system are known as its natural frequencies or resonant frequencies. A physical object, such as a building, bridge or molecule, has a set of modes and their natural frequencies that depend on its structure, materials. The most general motion of a system is a superposition of its normal modes, the modes are normal in the sense that they can move independently, that is to say that an excitation of one mode will never cause motion of a different mode. In mathematical terms, normal modes are orthogonal to each other, when relating to music, normal modes of vibrating instruments are called harmonics or overtones. The concept of normal modes also finds application in optics, quantum mechanics, most dynamical system can be excited under several modes. Each mode is characterized by one or several frequencies, according the modal variable field, for example, a vibrating rope in the 2D space is defined by a single-frequency, but a vibrating rope in the 3D space is defined by two frequencies -2D axial displacement-. For a given amplitude on the variable, each mode will store a specific amount of energy. From all the modes of a system, the normal or dominant mode of a system, will be the mode storing the minimum amount of energy. Or equivalently, for a given stored amount of energy, will be the mode imposing the maximum amplitude of the modal variable, a mode of vibration is characterized by a modal frequency and a mode shape. It is numbered according to the number of waves in the vibration. For example, if a beam with both ends pinned displayed a mode shape of half of a sine wave it would be vibrating in mode 1. If it had a full sine wave it would be vibrating in mode 2, in a system with two or more dimensions, such as the pictured disk, each dimension is given a mode number. Using polar coordinates, we have a radial coordinate and an angular coordinate, if one measured from the center outward along the radial coordinate one would encounter a full wave, so the mode number in the radial direction is 2. The other direction is trickier, because half of the disk is considered due to the antisymmetric nature of a disks vibration in the angular direction. Thus, measuring 180° along the direction you would encounter a half wave. So the mode number of the system is 2-1 or 1-2, depending on which coordinate is considered the first, in linear systems each mode is entirely independent of all other modes. In general all modes have different frequencies and different mode shapes, in a one-dimensional system at a given mode the vibration will have nodes, or places where the displacement is always zero
31.
Resonance
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In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at a specific preferential frequency. Frequencies at which the amplitude is a relative maximum are known as the systems resonant frequencies or resonance frequencies. At resonant frequencies, small periodic driving forces have the ability to produce large amplitude oscillations, Resonance occurs when a system is able to store and easily transfer energy between two or more different storage modes. However, there are some losses from cycle to cycle, called damping, when damping is small, the resonant frequency is approximately equal to the natural frequency of the system, which is a frequency of unforced vibrations. Some systems have multiple, distinct, resonant frequencies, resonant systems can be used to generate vibrations of a specific frequency, or pick out specific frequencies from a complex vibration containing many frequencies. Resonance occurs widely in nature, and is exploited in many manmade devices and it is the mechanism by which virtually all sine waves and vibrations are generated. Many sounds we hear, such as when hard objects of metal, glass, light and other short wavelength electromagnetic radiation is produced by resonance on an atomic scale, such as electrons in atoms. A familiar example is a swing, which acts as a pendulum. Pushing a person in a swing in time with the interval of the swing makes the swing go higher and higher. This is because the energy the swing absorbs is maximized when the match the swings natural oscillations. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings, trains, avoiding resonance disasters is a major concern in every building, tower, and bridge construction project. As a countermeasure, shock mounts can be installed to absorb resonant frequencies, the Taipei 101 building relies on a 660-tonne pendulum —a tuned mass damper—to cancel resonance. Furthermore, the structure is designed to resonate at a frequency that does not typically occur, buildings in seismic zones are often constructed to take into account the oscillating frequencies of expected ground motion. Clocks keep time by mechanical resonance in a wheel, pendulum. The cadence of runners has been hypothesized to be energetically favorable due to resonance between the energy stored in the lower limb and the mass of the runner. Acoustic resonance is a branch of mechanical resonance that is concerned with the mechanical vibrations across the range of human hearing. Like mechanical resonance, acoustic resonance can result in failure of the object at resonance. The classic example of this is breaking a glass with sound at the precise resonant frequency of the glass
32.
Node (physics)
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A node is a point along a standing wave where the wave has minimum amplitude. For instance, in a guitar string, the ends of the string are nodes. By changing the position of the end node through frets, the guitarist changes the length of the vibrating string. The opposite of a node is an anti-node, a point where the amplitude of the wave is a maximum. These occur midway between the nodes, standing waves result when two sinusoidal wave trains of the same frequency are moving in opposite directions in the same space and interfere with each other. In a standing wave the nodes are a series of locations at equally spaced intervals where the amplitude is zero. At these points the two waves add with opposite phase and cancel each other out and they occur at intervals of half a wavelength. Midway between each pair of nodes are locations where the amplitude is maximum, at these points the two waves add with the same phase and reinforce each other. In cases where the two opposite wave trains are not the amplitude, they do not cancel perfectly, so the amplitude of the standing wave at the nodes is not zero. This occurs when the reflection at the boundary is imperfect and this is indicated by a finite standing wave ratio, the ratio of the amplitude of the wave at the antinode to the amplitude at the node. These can be visible by sprinkling sand on the surface. In transmission lines a voltage node is a current antinode, in this type the derivative of the waves amplitude is forced to zero at the boundary. So there is a maximum at the boundary, the first node occurs a quarter wavelength from the end. A sound wave consists of alternating cycles of compression and expansion of the wave medium, during compression, the molecules of the medium are forced together, resulting in the increased pressure and density. During expansion the molecules are forced apart, resulting in the decreased pressure, the number of nodes in a specified length is directly proportional to the frequency of the wave. Occasionally on a guitar, violin, or other stringed instrument, when the finger is placed on top of the string at a certain point, but does not push the string all the way down to the fretboard, a third node is created and a harmonic is sounded. During normal play when the frets are used, the harmonics are always present, with the artificial node method, the overtone is louder and the fundamental tone is quieter. If the finger is placed at the midpoint of the string, the first overtone is heard, when two additional nodes divide the string into thirds, this creates an octave and a perfect fifth
33.
Robert Hooke
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Robert Hooke FRS was an English natural philosopher, architect and polymath. Allan Chapman has characterised him as Englands Leonardo, Robert Gunthers Early Science in Oxford, a history of science in Oxford during the Protectorate, Restoration and Age of Enlightenment, devotes five of its fourteen volumes to Hooke. Hooke studied at Wadham College, Oxford during the Protectorate where he became one of a tightly knit group of ardent Royalists led by John Wilkins. Here he was employed as an assistant to Thomas Willis and to Robert Boyle and he built some of the earliest Gregorian telescopes and observed the rotations of Mars and Jupiter. In 1665 he inspired the use of microscopes for scientific exploration with his book, based on his microscopic observations of fossils, Hooke was an early proponent of biological evolution. Much of Hookes scientific work was conducted in his capacity as curator of experiments of the Royal Society, much of what is known of Hookes early life comes from an autobiography that he commenced in 1696 but never completed. Richard Waller mentions it in his introduction to The Posthumous Works of Robert Hooke, the work of Waller, along with John Wards Lives of the Gresham Professors and John Aubreys Brief Lives, form the major near-contemporaneous biographical accounts of Hooke. Robert Hooke was born in 1635 in Freshwater on the Isle of Wight to John Hooke, Robert was the last of four children, two boys and two girls, and there was an age difference of seven years between him and the next youngest. Their father John was a Church of England priest, the curate of Freshwaters Church of All Saints, Robert Hooke was expected to succeed in his education and join the Church. John Hooke also was in charge of a school, and so was able to teach Robert. He was a Royalist and almost certainly a member of a group who went to pay their respects to Charles I when he escaped to the Isle of Wight, Robert, too, grew up to be a staunch monarchist. As a youth, Robert Hooke was fascinated by observation, mechanical works and he dismantled a brass clock and built a wooden replica that, by all accounts, worked well enough, and he learned to draw, making his own materials from coal, chalk and ruddle. Hooke quickly mastered Latin and Greek, made study of Hebrew. Here, too, he embarked on his study of mechanics. It appears that Hooke was one of a group of students whom Busby educated in parallel to the work of the school. Contemporary accounts say he was not much seen in the school, in 1653, Hooke secured a choristers place at Christ Church, Oxford. He was employed as an assistant to Dr Thomas Willis. There he met the natural philosopher Robert Boyle, and gained employment as his assistant from about 1655 to 1662, constructing, operating and he did not take his Master of Arts until 1662 or 1663
34.
Cymatics
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Cymatics, from Greek, κῦμα, meaning wave, is a subset of modal vibrational phenomena. The term was coined by Hans Jenny, a Swiss follower of the school known as anthroposophy. Typically the surface of a plate, diaphragm or membrane is vibrated, different patterns emerge in the excitatory medium depending on the geometry of the plate and the driving frequency. The apparatus employed can be simple, such as the old Chinese singing bowl, in which copper handles are rubbed, other examples include the Chladni Plate and the so-called cymascope. On July 8,1680, Robert Hooke was able to see the patterns associated with the modes of vibration of glass plates. Hooke ran a bow along the edge of a plate covered with flour. The powder moves due to the vibration and accumulates progressively in points of the corresponding to the sound vibration. The points form a pattern of lines, known as lines of the vibration mode. This provided an important contribution to the understanding of acoustic phenomena, the figures thus obtained are still designated by the name of Chladni figures. Jenny put sand, dust and fluids on a metal plate connected to an oscillator which could produce a spectrum of frequencies. The sand or other substances were organized into different structures characterized by geometric shapes typical of the frequency of the emitted by the oscillator. According to Jenny, these structures, reminiscent of the mandala and other forms recurring in nature, the sound wave, therefore, does not influence at all the shape of the vibrating body or the shape of the nodal patterns. The only thing that changes due to the vibration is the arrangement of the sand, the image formed by the sand, in turn, is influenced by the frequency spectrum of the vibration only because each vibration mode is characterized by a specific frequency. Therefore, the spectrum of the signal that excites the vibration determines which patterns are actually nodally displayed, the physical phenomena involved in the formation of Chladni figures are best explained by classical physics. The New Age movement has been quick to claim that cymatics has special healing properties and it has been posited that sound waves generating particular patterns may stimulate healing, although this does not appear to be related to cymatics at all, rather it is a function of acoustics. However, other than articles on the subject of low-amplitude high-frequency sound in bone fracture healing. Devices for displaying nodal images have influenced visual arts and contemporary music, artist Björk created projections of cymatics patterns by using bass frequencies on tour for her album Biophilia. Hans Jennys book on Chladni figures influenced Alvin Lucier and helped lead to Luciers composition Queen of the South, Jennys work was also followed up by Center for Advanced Visual Studies founder György Kepes at MIT
35.
Bow (music)
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In music, a bow is a tensioned stick with hair affixed to it which is moved across some part of a musical instrument causing vibration, which the instrument emits as sound. The vast majority of bows are used with string instruments, such as the violin, although some bows are used with musical saws and other bowed idiophones. A bow consists of a specially shaped stick with other material forming a ribbon stretched between its ends, which is used to stroke the string and create sound, different musical cultures have adopted various designs for the bow. For instance, in some bows a single cord is stretched between the ends of the stick, in the Western tradition of bow making—bows for the instruments of the violin and viol families—a hank of horsehair is normally employed. The manufacture of bows is considered a craft, and well-made bows command high prices. Part of the bow makers skill is the ability to high quality material for the stick. Historically, Western bows have been made of wood from Brazil. Carbon fiber bows have become popular, and some of the better carbon fiber bows are now comparable to fine pernambuco sticks. For the frog, which holds and adjusts the near end of the horsehair, ebony is most often used, but other materials, often decorative, were used as well, such as ivory and tortoiseshell. Materials such as mother of pearl or abalone shell are used on the slide which covers the mortise. Sometimes Parisian eyes are used, with the circle of shell surrounded by a metal ring, near the frog is the grip, which is made of a wire, silk, or whalebone wrap and a thumb cushion made of leather or snakeskin. The tip plate of the bow may be made of bone, ivory, mammoth ivory, or metal, a bow maker or archetier typically uses between 150 and 200 hairs from the tail of a horse for a violin bow. Bows for other members of the family typically have a wider ribbon. There is a widely held belief among string players, neither proven nor disproven scientifically, lower quality bows often use nylon or synthetic hair. Rosin, or colophony, a hard, sticky substance made from resin, is applied to the bow hair to increase friction. In making a bow, the greater part of the woodworking is done on a straight stick. According to James McKean, the bow maker graduates the stick in precise gradations so that it is evenly flexible throughout and these gradations were originally calculated by François Tourte, discussed below. In order to shape the curve or camber of the bow stick, the maker carefully heats the stick in an alcohol flame, a metal or wooden template is used to get the models exact curve and shape while heating
36.
Napoleon
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Napoleon Bonaparte was a French military and political leader who rose to prominence during the French Revolution and led several successful campaigns during the French Revolutionary Wars. As Napoleon I, he was Emperor of the French from 1804 until 1814, Napoleon dominated European and global affairs for more than a decade while leading France against a series of coalitions in the Napoleonic Wars. He won most of these wars and the vast majority of his battles, one of the greatest commanders in history, his wars and campaigns are studied at military schools worldwide. Napoleons political and cultural legacy has ensured his status as one of the most celebrated and he was born Napoleone di Buonaparte in Corsica to a relatively modest family from the minor nobility. When the Revolution broke out in 1789, Napoleon was serving as an officer in the French army. Seizing the new opportunities presented by the Revolution, he rose through the ranks of the military. The Directory eventually gave him command of the Army of Italy after he suppressed a revolt against the government from royalist insurgents, in 1798, he led a military expedition to Egypt that served as a springboard to political power. He engineered a coup in November 1799 and became First Consul of the Republic and his ambition and public approval inspired him to go further, and in 1804 he became the first Emperor of the French. Intractable differences with the British meant that the French were facing a Third Coalition by 1805, in 1806, the Fourth Coalition took up arms against him because Prussia became worried about growing French influence on the continent. Napoleon quickly defeated Prussia at the battles of Jena and Auerstedt, then marched the Grand Army deep into Eastern Europe, France then forced the defeated nations of the Fourth Coalition to sign the Treaties of Tilsit in July 1807, bringing an uneasy peace to the continent. Tilsit signified the high watermark of the French Empire, hoping to extend the Continental System and choke off British trade with the European mainland, Napoleon invaded Iberia and declared his brother Joseph the King of Spain in 1808. The Spanish and the Portuguese revolted with British support, the Peninsular War lasted six years, featured extensive guerrilla warfare, and ended in victory for the Allies. The Continental System caused recurring diplomatic conflicts between France and its client states, especially Russia, unwilling to bear the economic consequences of reduced trade, the Russians routinely violated the Continental System and enticed Napoleon into another war. The French launched an invasion of Russia in the summer of 1812. The resulting campaign witnessed the collapse of the Grand Army, the destruction of Russian cities, in 1813, Prussia and Austria joined Russian forces in a Sixth Coalition against France. A lengthy military campaign culminated in a large Allied army defeating Napoleon at the Battle of Leipzig in October 1813, the Allies then invaded France and captured Paris in the spring of 1814, forcing Napoleon to abdicate in April. He was exiled to the island of Elba near Rome and the Bourbons were restored to power, however, Napoleon escaped from Elba in February 1815 and took control of France once again. The Allies responded by forming a Seventh Coalition, which defeated Napoleon at the Battle of Waterloo in June, the British exiled him to the remote island of Saint Helena in the South Atlantic, where he died six years later at the age of 51
37.
Sophie Germain
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Marie-Sophie Germain was a French mathematician, physicist, and philosopher. One of the pioneers of elasticity theory, she won the prize from the Paris Academy of Sciences for her essay on the subject. Her work on Fermats Last Theorem provided a foundation for exploring the subject for hundreds of years after. Because of prejudice against her sex, she was unable to make an out of mathematics. At the centenary of her life, a street and a school were named after her. The Academy of Sciences established The Sophie Germain Prize in her honor, marie-Sophie Germain was born on 1 April 1776, in Paris, France, in a house on Rue Saint-Denis. According to most sources, her father, Ambroise-Franҫois, was a silk merchant. In 1789, he was elected as a representative of the bourgeoisie to the États-Généraux and it is therefore assumed that Sophie witnessed many discussions between her father and his friends on politics and philosophy. Gray proposes that after his career, Ambroise-Franҫois became the director of a bank, at least. Marie-Sophie had one sister, named Angélique-Ambroise, and one older sister. Her mother was also named Marie-Madeline, and this plethora of Maries may have been the reason she went by Sophie, Germains nephew Armand-Jacques Lherbette, Marie-Madelines son, published some of Germains work after she died. When Germain was 13, the Bastille fell, and the atmosphere of the city forced her to stay inside. For entertainment she turned to her fathers library, here she found J. E. Montuclas LHistoire des Mathématiques, and his story of the death of Archimedes intrigued her. Sophie Germain thought that if the method, which at that time referred to all of pure mathematics, could hold such fascination for Archimedes. So she pored over every book on mathematics in her fathers library, even teaching herself Latin and Greek so she could read works like those of Sir Isaac Newton and she also enjoyed Traité dArithmétique by Étienne Bézout and Le Calcul Différentiel by Jacques Antoine-Joseph Cousin. Later, Cousin visited her in her house, encouraging her in her studies, Germains parents did not at all approve of her sudden fascination with mathematics, which was then thought inappropriate for a woman. After some time, her mother even secretly supported her, in 1794, when Germain was 18, the École Polytechnique opened. As a woman, Germain was barred from attending, but the new system of education made the notes available to all who asked
38.
Violin
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The violin is a wooden string instrument in the violin family. It is the smallest and highest-pitched instrument in the family in regular use, smaller violin-type instruments are known, including the violino piccolo and the kit violin, but these are virtually unused in the 2010s. The violin typically has four strings tuned in fifths, and is most commonly played by drawing a bow across its strings. Violins are important instruments in a variety of musical genres. They are most prominent in the Western classical tradition and in varieties of folk music. They are also used in genres of folk including country music and bluegrass music. Electric violins are used in forms of rock music, further. The violin is sometimes called a fiddle, particularly in Irish traditional music and bluegrass. The violin was first known in 16th-century Italy, with further modifications occurring in the 18th and 19th centuries. In Europe it served as the basis for stringed instruments used in classical music, the viola. According to their reputation, the quality of their sound has defied attempts to explain or equal it, many of these trade instruments were formerly sold by Sears, Roebuck and Co. and other mass merchandisers. A person who makes or repairs violins is called a luthier or violinmaker, the parts of a violin are usually made from different types of wood and on the use of a pickup and an amplifier and speaker). Violins can be strung with gut, Perlon or other synthetic, the earliest stringed instruments were mostly plucked. Similar and variant types were probably disseminated along East-West trading routes from Asia into the Middle East, the first makers of violins probably borrowed from various developments of the Byzantine lira. These included the rebec, the Arabic rebab, the vielle, the earliest pictures of violins, albeit with three strings, are seen in northern Italy around 1530, at around the same time as the words violino and vyollon are seen in Italian and French documents. One of the earliest explicit descriptions of the instrument, including its tuning, is from the Epitome musical by Jambe de Fer, by this time, the violin had already begun to spread throughout Europe. The violin proved very popular, both among street musicians and the nobility, the French king Charles IX ordered Andrea Amati to construct 24 violins for him in 1560, one of these noble instruments, the Charles IX, is the oldest surviving violin. The Messiah or Le Messie made by Antonio Stradivari in 1716 remains pristine and it is now located in the Ashmolean Museum of Oxford
39.
Guitar
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The guitar is a musical instrument classified as a fretted string instrument with anywhere from four to 18 strings, usually having six. The sound is projected either acoustically, using a wooden or plastic and wood box, or through electrical amplifier. It is typically played by strumming or plucking the strings with the fingers, the guitar is a type of chordophone, traditionally constructed from wood and strung with either gut, nylon or steel strings and distinguished from other chordophones by its construction and tuning. There are three types of modern acoustic guitar, the classical guitar, the steel-string acoustic guitar, and the archtop guitar. The tone of a guitar is produced by the strings vibration, amplified by the hollow body of the guitar. The term finger-picking can also refer to a tradition of folk, blues, bluegrass. The acoustic bass guitar is an instrument that is one octave below a regular guitar. Early amplified guitars employed a body, but a solid wood body was eventually found more suitable during the 1960s and 1970s. As with acoustic guitars, there are a number of types of guitars, including hollowbody guitars, archtop guitars and solid-body guitars. The electric guitar has had a influence on popular culture. The guitar is used in a variety of musical genres worldwide. It is recognized as an instrument in genres such as blues, bluegrass, country, flamenco, folk, jazz, jota, mariachi, metal, punk, reggae, rock, soul. The term is used to refer to a number of chordophones that were developed and used across Europe, beginning in the 12th century and, later, in the Americas. The modern word guitar, and its antecedents, has applied to a wide variety of chordophones since classical times. Many influences are cited as antecedents to the modern guitar, at least two instruments called guitars were in use in Spain by 1200, the guitarra latina and the so-called guitarra morisca. The guitarra morisca had a back, wide fingerboard. The guitarra Latina had a sound hole and a narrower neck. By the 14th century the qualifiers moresca or morisca and latina had been dropped, and it had six courses, lute-like tuning in fourths and a guitar-like body, although early representations reveal an instrument with a sharply cut waist
40.
Cello
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The cello or violoncello is a bowed or plucked string instrument with four strings tuned in perfect fifths. The strings from low to high are generally tuned to C2, G2, D3 and A3 and it is a member of the violin family of musical instruments, which also includes the violin and viola and the double bass. The cello is used as a musical instrument, as well as in chamber music ensembles, string orchestras, as a member of the string section of symphony orchestras. It is the second-largest and second lowest bowed string instrument in the symphony orchestra. Cello parts are written in the bass clef, but both tenor clef and treble clefs are used for higher-range parts, both in orchestral/chamber music parts and in solo cello works. A person who plays the cello is called a cellist or violoncellist, in a small Classical ensemble, such as a string quartet, the cello typically plays the bass part, the lowest-pitched musical line of the piece. In orchestra, in Baroque era and Classical music period, the cello plays the bass part. In Baroque era music, the cello is used to play the basso continuo bassline, in a Baroque performance, the cello player might be joined by other bass instruments, playing double bass, viol or other low-register instruments. The name cello is a contraction of the Italian violoncello, which means little violone, in modern symphony orchestras, it is the second largest stringed instrument. Thus, the name contained both the augmentative -one and the diminutive -cello. By the turn of the 20th century, it had become common to shorten the name to cello and it is now customary to use cello without apostrophe as the full designation. Viol is derived from the viola, which was derived from Medieval Latin vitula. Cellos are tuned in fifths, starting with C2, followed by G2, D3 and it is tuned in the same intervals as the viola, but an octave lower. Unlike the violin or viola but similar to the double bass, the cello is most closely associated with European classical music, and has been described as the closest sounding instrument to the human voice. The instrument is a part of the orchestra, as part of the string section. A large number of concertos and sonatas have been written for the cello, among the most well-known Baroque works for the cello are Johann Sebastian Bachs six unaccompanied Suites. The Prelude from the First Suite is particularly famous, romantic era repertoire includes the Robert Schumann Concerto, the Antonín Dvořák Concerto as well as the two sonatas and the Double Concerto by Johannes Brahms. The cello is increasingly common in traditional music, especially Scottish fiddle music
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Signal generator
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A signal generator is an electronic device that generates repeating or non-repeating electronic signals in either the analog or the digital domain. It is generally used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, there are many different types of signal generators with different purposes and applications and at varying levels of expense. These types include function generators, RF and microwave signal generators, pitch generators, arbitrary waveform generators, digital pattern generators, in general, no device is suitable for all possible applications. Traditionally, signal generators have been embedded hardware units, but since the age of multimedia PCs, a function generator is a device which produces simple repetitive waveforms. Such devices contain an electronic oscillator, a circuit that is capable of creating a repetitive waveform, the most common waveform is a sine wave, but sawtooth, step, square, and triangular waveform oscillators are commonly available as are arbitrary waveform generators. An arbitrary waveform generator is a signal generator that generates arbitrary waveforms within published limits of frequency range, accuracy. Unlike a function generator that produces a set of specific waveforms. An AWG is generally more expensive than a generator and often has less bandwidth. An AWG is used in design and test applications. New high-speed DACs provide up to 16-bit resolution at sample rates in excess of 1 GS/s and these devices provide the foundation for an AWG with the bandwidth and dynamic range to address modern radio and communication applications. Example applications include commercial wireless standards such as Wi-Fi, WiMAX and LTE, also, broad modulation bandwidth allows multi-carrier signal generation, necessary for testing receiver adjacent channel rejection. RF and microwave signal generators normally have similar features and capabilities, RF signal generators typically range from a few kHz to 6 GHz, while microwave signal generators cover a much wider frequency range, from less than 1 MHz to at least 20 GHz. Some models go as high as 70 GHz with a direct coaxial output, RF and microwave signal generators can be classified further as analog or vector signal generators. Analog signal generators based on a sine-wave oscillator were common before the inception of digital electronics, there was a sharp distinction in purpose and design of radio-frequency and audio-frequency signal generators. RF RF signal generators are capable of producing CW tones, the output frequency can usually be tuned anywhere in their frequency range. Many models offer various types of modulation, either as standard equipment or as an optional capability to the base unit. This could include AM, FM, ΦM and pulse modulation, another common feature is a built-in attenuator which makes it possible to vary the signal’s output power. Depending on the manufacturer and model, output powers can range from -135 to +30 dBm, a wide range of output power is desirable, since different applications require different amounts of signal power
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Quantum mechanics
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Quantum mechanics, including quantum field theory, is a branch of physics which is the fundamental theory of nature at small scales and low energies of atoms and subatomic particles. Classical physics, the physics existing before quantum mechanics, derives from quantum mechanics as an approximation valid only at large scales, early quantum theory was profoundly reconceived in the mid-1920s. The reconceived theory is formulated in various specially developed mathematical formalisms, in one of them, a mathematical function, the wave function, provides information about the probability amplitude of position, momentum, and other physical properties of a particle. In 1803, Thomas Young, an English polymath, performed the famous experiment that he later described in a paper titled On the nature of light. This experiment played a role in the general acceptance of the wave theory of light. In 1838, Michael Faraday discovered cathode rays, Plancks hypothesis that energy is radiated and absorbed in discrete quanta precisely matched the observed patterns of black-body radiation. In 1896, Wilhelm Wien empirically determined a distribution law of black-body radiation, ludwig Boltzmann independently arrived at this result by considerations of Maxwells equations. However, it was only at high frequencies and underestimated the radiance at low frequencies. Later, Planck corrected this model using Boltzmanns statistical interpretation of thermodynamics and proposed what is now called Plancks law, following Max Plancks solution in 1900 to the black-body radiation problem, Albert Einstein offered a quantum-based theory to explain the photoelectric effect. Among the first to study quantum phenomena in nature were Arthur Compton, C. V. Raman, robert Andrews Millikan studied the photoelectric effect experimentally, and Albert Einstein developed a theory for it. In 1913, Peter Debye extended Niels Bohrs theory of structure, introducing elliptical orbits. This phase is known as old quantum theory, according to Planck, each energy element is proportional to its frequency, E = h ν, where h is Plancks constant. Planck cautiously insisted that this was simply an aspect of the processes of absorption and emission of radiation and had nothing to do with the reality of the radiation itself. In fact, he considered his quantum hypothesis a mathematical trick to get the right rather than a sizable discovery. He won the 1921 Nobel Prize in Physics for this work, lower energy/frequency means increased time and vice versa, photons of differing frequencies all deliver the same amount of action, but do so in varying time intervals. High frequency waves are damaging to human tissue because they deliver their action packets concentrated in time, the Copenhagen interpretation of Niels Bohr became widely accepted. In the mid-1920s, developments in mechanics led to its becoming the standard formulation for atomic physics. In the summer of 1925, Bohr and Heisenberg published results that closed the old quantum theory, out of deference to their particle-like behavior in certain processes and measurements, light quanta came to be called photons
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Benjamin Franklin
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Benjamin Franklin was one of the Founding Fathers of the United States. Franklin was a polymath and a leading author, printer, political theorist, politician, freemason, postmaster, scientist, inventor, civic activist, statesman. As a scientist, he was a figure in the American Enlightenment. As an inventor, he is known for the rod, bifocals. He facilitated many civic organizations, including Philadelphias fire department and the University of Pennsylvania, Franklin earned the title of The First American for his early and indefatigable campaigning for colonial unity, initially as an author and spokesman in London for several colonies. As the first United States Ambassador to France, he exemplified the emerging American nation, in the words of historian Henry Steele Commager, In a Franklin could be merged the virtues of Puritanism without its defects, the illumination of the Enlightenment without its heat. To Walter Isaacson, this makes Franklin the most accomplished American of his age, Franklin became a successful newspaper editor and printer in Philadelphia, the leading city in the colonies, publishing the Pennsylvania Gazette at the age of 23. He became wealthy publishing this and Poor Richards Almanack, which he authored under the pseudonym Richard Saunders, after 1767, he was associated with the Pennsylvania Chronicle, a newspaper that was known for its revolutionary sentiments and criticisms of the British policies. He pioneered and was first president of The Academy and College of Philadelphia which opened in 1751 and he organized and was the first secretary of the American Philosophical Society and was elected president in 1769. Franklin became a hero in America as an agent for several colonies when he spearheaded an effort in London to have the Parliament of Great Britain repeal the unpopular Stamp Act. An accomplished diplomat, he was widely admired among the French as American minister to Paris and was a figure in the development of positive Franco-American relations. His efforts proved vital for the American Revolution in securing shipments of crucial munitions from France, during the Revolution, he became the first US Postmaster General. He was active in community affairs and colonial and state politics, from 1785 to 1788, he served as governor of Pennsylvania. He initially owned and dealt in slaves but, by the 1750s, he argued against slavery from an economic perspective, Franklins father, Josiah Franklin, was a tallow chandler, a soap-maker and a candle-maker. Josiah was born at Ecton, Northamptonshire, England on December 23,1657, the son of Thomas Franklin, a blacksmith-farmer, and Jane White. His mother, Abiah Folger, was born in Nantucket, Massachusetts, on August 15,1667, to Peter Folger, a miller and schoolteacher, and his wife, Mary Morrill, Josiah Franklin had seventeen children with his two wives. He married his first wife, Anne Child, in about 1677 in Ecton and emigrated with her to Boston in 1683, after her death, Josiah was married to Abiah Folger on July 9,1689 in the Old South Meeting House by Samuel Willard. Benjamin, their child, was Josiah Franklins fifteenth child and tenth
