|
Ještěd Tower
Ještěd Tower () is a television transmitter on top of Mount Ještěd near Liberec in the Czech Republic. Measuring , it is made of reinforced concrete shaped in a "hyperboloid" form. The tower was designed by architect Karel Hubáček, who was assisted by :cs:Zdeněk Patrman, Zdeněk Patrman, involved in building statics, and by :cs:Otakar Binar, Otakar Binar, who designed the interior furnishing. It took the team three years to finalize the structure design (1963–1966). The construction itself took seven years to finish (1966–1973). The hyperboloid shape was chosen since it naturally extends the silhouette of the hill and, moreover, resists the extreme climate conditions on the summit of Mount Ještěd. The design combines the operation of a mountaintop hotel and a television transmitter. The hotel and restaurant are located in the lowest sections of the tower. Before construction of the hotel, two huts stood near the mountain summit: one was built in the middle of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liberec Region
Liberec Region () is an administrative unit (Czech language, Czech: ''kraj'') of the Czech Republic, located in the northernmost part of its historical region of Bohemia. It is named after its capital Liberec. The region shares international borders with Germany and Poland. Domestically the region borders the Ústí nad Labem Region to the west, the Central Bohemian Region to the south and the Hradec Králové Region to the east. Administrative divisions The Liberec Region is divided into 4 districts: At a lower level, the region has 215 municipalities, comprising 65 in the Semily District, 59 in the Jablonec nad Nisou District, 57 in the Česká Lípa District and 34 in the Liberec District. Cities and towns The table below gives an overview of towns and cities in the region that have at least 7,000 inhabitants (as of 1 January 2024). Physical geography The region's landscape includes the Jizera Mountains, part of the Krkonoše Mountains and part of the Lusatian Mountains. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest Chord (geometry), chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length d of a diameter is also called the diameter. In this sense one speaks of diameter rather than diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being twice the radius r. :d = 2r \qquad\text\qquad r = \frac. The word "diameter" is derived from (), "diameter of a circle", from (), "across, through" and (), "measure". It is often abbreviated \text, \text, d, or \varnothing. Constructions With straightedge and compass, a diameter of a given circle can be constructed as the perpendicular bisector of an arbitrary chord. Drawing two diameters in this way can be used to locate the center of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Czechoslovak Koruna
The Czechoslovak koruna (in Czech and Slovak: ''koruna československá'', at times ''koruna česko-slovenská''; ''koruna'' means ''crown'') was the currency of Czechoslovakia from 10 April 1919 to 14 March 1939, and from 1 November 1945 to 7 February 1993. For a brief time in 1939 and again in 1993, it was also the currency of both the separate Czech Republic and Slovakia. On 8 February 1993, it was replaced by the Czech koruna and the Slovak koruna, both at par. The (last) ISO 4217 code and the local abbreviations for the koruna were ''CSK'' and ''Kčs''. One koruna equalled 100 ''haléřů'' (Czech, singular: ''haléř'') or ''halierov'' (Slovak, singular: ''halier''). In both languages, the abbreviation ''h'' was used. The abbreviation was placed behind the numeric value. First koruna A currency called the '' krone'' in German and ''koruna'' in Czech was introduced in Austria-Hungary on 11 September 1892, as the first modern gold-based currency in the area. After the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuned Mass Damper
A tuned mass damper (TMD), also known as a harmonic absorber or seismic damper, is a device mounted in structures to reduce mechanical vibrations, consisting of a mass mounted on one or more damped springs. Its oscillation frequency is tuned to be similar to the resonant frequency of the object it is mounted to, and reduces the object's maximum amplitude while weighing much less than it. TMDs can prevent discomfort, damage, or outright structural failure. They are frequently used in power transmission, automobiles and buildings. Principle Tuned mass dampers stabilize against violent motion caused by harmonic vibration. They use a comparatively lightweight component to reduce the vibration of a system so that its worst-case vibrations are less intense. Roughly speaking, practical systems are tuned to either move the main mode away from a troubling excitation frequency, or to add damping to a resonance that is difficult or expensive to damp directly. An example of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pendulum
A pendulum is a device made of a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. Pendulums were widely used in early mechanical clocks for timekeeping. The regular motion of pendulums was used for timekeeping and was the world's most accurate timekeeping technology until the 1930s. The pendulum clock invented by Christiaan Huygens in 1656 became the world's standard timekeeper, used in homes and offices for 270 years, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladding (construction)
Cladding is the application of one material over another to provide a skin or layer. In construction, cladding is used to provide a degree of thermal insulation and weather resistance, and to improve the appearance of buildings. Cladding can be made of any of a wide range of materials including wood, metal, brick, vinyl, and composite materials that can include aluminium, wood, blends of cement and recycled polystyrene, wheat/rice straw fibres. Rainscreen cladding is a form of weather cladding designed to protect against the elements, but also offers thermal insulation. The cladding does not itself need to be waterproof, merely a control element: it may serve only to direct water or wind safely away in order to control run-off and prevent its infiltration into the building structure. Cladding may also be a control element for noise, either entering or escaping. Cladding can become a fire risk by design or material. Description Cladding in construction is material applied o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patent
A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an sufficiency of disclosure, enabling disclosure of the invention."A patent is not the grant of a right to make or use or sell. It does not, directly or indirectly, imply any such right. It grants only the right to exclude others. The supposition that a right to make is created by the patent grant is obviously inconsistent with the established distinctions between generic and specific patents, and with the well-known fact that a very considerable portion of the patents granted are in a field covered by a former relatively generic or basic patent, are tributary to such earlier patent, and cannot be practiced unless by license thereunder." – ''Herman v. Youngstown Car Mfg. Co.'', 191 F. 579, 584–85, 112 CCA 185 (6th Cir. 1911) In most countries, patent rights fall under private la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Czech Technical University In Prague
Czech Technical University in Prague (CTU) () is one of the largest universities in the Czech Republic with 8 faculties, and is one of the oldest institutes of technology in Central Europe. It is also the oldest non-military technical university in Europe. In the academic year 2020/21, Czech Technical University offered 130 degree programs in Czech and 84 in English. It was considered one of the top 10 universities in emerging Europe and Central Asia in the same year. History It was established as the Institute of Engineering Education in 1707, but as a secondary education (high school) instead of a tertiary university, by Emperor Joseph I as a response to Christian Josef Willenberg's petition addressed to preceding emperor Leopold I. In 1806, the institute of Engineering Education was transformed into Prague Polytechnical Institute (or Prague Polytechnic), i.e. a school independent of the University of Prague. This was a Europe-wide trend in the early 19th century, as p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Czechoslovak Academy Of Sciences
The Czechoslovak Academy of Sciences (Czech: ''Československá akademie věd'', Slovak: ''Česko-slovenská akadémia vied'') was established in 1953 to be the scientific center for Czechoslovakia. It was succeeded by the Czech Academy of Sciences (''Akademie věd České republiky'') and Slovak Academy of Sciences (''Slovenská akadémia vied'') in 1992. History The Royal Czech Society of Sciences, which encompassed both the humanities and the natural sciences, was established in the Czech Crown lands in 1784. After the Communist regime came to power in Czechoslovakia in 1948, all scientific, non-university institutions and learned societies were dissolved and, in their place, the Czechoslovak Academy of Sciences was founded by Act No. 52/1952. It comprised both a complex of research institutes and a learned society. The Slovak Academy of Sciences, established in 1942 and re-established in 1953, was a formal part of the Czechoslovak Academy of Sciences from 1960 to 1992. Dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
