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However a log-periodic dipole array consists of a number of dipole elements of different lengths in order to obtain a somewhat directional antenna having an extremely wide bandwidth: these are frequently used for television reception in fringe areas. The dipole antennas composing it are all considered "active elements" since they are all electrically connected together (and to the transmission line). On the other hand, a superficially similar dipole array, the Yagi-Uda Antenna (or simply "Yagi"), has only one dipole element with an electrical connection; the other so-called parasitic elements interact with the electromagnetic field in order to realize a fairly directional antenna but one which is limited to a rather narrow bandwidth. The Yagi antenna has similar looking parasitic dipole elements but which act differently due to their somewhat different lengths. There may be a number of so-called "directors" in front of the active element in the direction of propagation, and usually a single (but possibly more) "reflector" on the opposite side of the active element.
What is a variation of this antenna type?
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The answer: Yagi-Uda Antenna

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Their endowment by a prince or monarch and their role in training government officials made these Mediterranean universities similar to Islamic madrasas, although madrasas were generally smaller and individual teachers, rather than the madrasa itself, granted the license or degree. Scholars like Arnold H. Green and Hossein Nasr have argued that starting in the 10th century, some medieval Islamic madrasahs became universities. George Makdisi and others, however, argue that the European university has no parallel in the medieval Islamic world. Other scholars regard the university as uniquely European in origin and characteristics.
In which century did Islamic madrasas start to transform into universities?
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The answer: 10th

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International pressure led to a ceasefire, and by then 37% of the island had been taken over by the Turks and 180,000 Greek Cypriots had been evicted from their homes in the north. At the same time, around 50,000 Turkish Cypriots moved to the areas under the control of the Turkish Forces and settled in the properties of the displaced Greek Cypriots. Among a variety of sanctions against Turkey, in mid-1975 the US Congress imposed an arms embargo on Turkey for using American-supplied equipment during the Turkish invasion of Cyprus in 1974. There are 1,534 Greek Cypriots and 502 Turkish Cypriots missing as a result of the fighting.
How many Greek Cypriots had been displaced from their homes?
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The answer: 180,000

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During the 19th and 20th century, many national political parties organized themselves into international organizations along similar policy lines. Notable examples are The Universal Party, International Workingmen's Association (also called the First International), the Socialist International (also called the Second International), the Communist International (also called the Third International), and the Fourth International, as organizations of working class parties, or the Liberal International (yellow), Hizb ut-Tahrir, Christian Democratic International and the International Democrat Union (blue). Organized in Italy in 1945, the International Communist Party, since 1974 headquartered in Florence has sections in six countries.[citation needed] Worldwide green parties have recently established the Global Greens. The Universal Party, The Socialist International, the Liberal International, and the International Democrat Union are all based in London. Some administrations (e.g. Hong Kong) outlaw formal linkages between local and foreign political organizations, effectively outlawing international political parties.
When did political parties organize themselves into international organizations?
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The answer:
19th and 20th century