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Vitold Belevitch
Vitold Belevitch (2 March 1921 – 26 December 1999) was a Belgian mathematician and electrical engineer of Russian origin who produced some important work in the field of electrical network theory. Born to parents fleeing the Bolsheviks, he settled in Belgium where he worked on early computer construction projects. Belevitch is responsible for a number of circuit theorems and introduced the now well-known scattering parameters. Belevitch had an interest in languages and found a mathematical derivation of Zipf's law. He also published on machine languages. Another field of interest was transmission lines, where he published on line coupling. He worked on telephone conferencing and introduced the mathematical construct of the conference matrix. Early life Belevitch was born 2 March 1921 in Terijoki, Karelia, now incorporated into Russia, but at the time part of Finland. Belevitch's parents were Russian and his mother was an ethnic Pole. They were attempting to flee from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circuit Theory
Circuit may refer to: Science and technology Electrical engineering * Electrical circuit, a complete electrical network with a closed-loop giving a return path for current ** Analog circuit, uses continuous signal levels ** Balanced circuit, paths are impedance-matched ** Circuit analysis, the process of finding the voltages across, and the currents through, every component in an electrical circuit ** Circuit diagram, a graphical representation of an electrical circuit ** Digital circuit, uses discrete signal levels ** Electronic circuit, contains "active" (nonlinear) electronic components capable of performing amplification, computation, and data transfer *** Asynchronous circuit, or self-timed circuit, a sequential digital logic circuit that is not governed by a clock circuit or global clock signal *** Integrated circuit, a set of electronic circuits on a small "chip" of semiconductor material **** Mixed-signal integrated circuit, contains both analog and digital signals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bessel Function
Bessel functions, named after Friedrich Bessel who was the first to systematically study them in 1824, are canonical solutions of Bessel's differential equation x^2 \frac + x \frac + \left(x^2 - \alpha^2 \right)y = 0 for an arbitrary complex number \alpha, which represents the ''order'' of the Bessel function. Although \alpha and -\alpha produce the same differential equation, it is conventional to define different Bessel functions for these two values in such a way that the Bessel functions are mostly smooth functions of \alpha. The most important cases are when \alpha is an integer or half-integer. Bessel functions for integer \alpha are also known as cylinder functions or the cylindrical harmonics because they appear in the solution to Laplace's equation in cylindrical coordinates. Spherical Bessel functions with half-integer \alpha are obtained when solving the Helmholtz equation in spherical coordinates. Applications Bessel's equation arises when finding separa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks in World War II, Tanks and Air warfare of World War II, aircraft played major roles, enabling the strategic bombing of cities and delivery of the Atomic bombings of Hiroshima and Nagasaki, first and only nuclear weapons ever used in war. World War II is the List of wars by death toll, deadliest conflict in history, causing World War II casualties, the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Allied-occupied Germany, Germany, Allied-occupied Austria, Austria, Occupation of Japan, Japan, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berlin
Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population within city limits, highest population within its city limits of any city in the European Union. The city is also one of the states of Germany, being the List of German states by area, third smallest state in the country by area. Berlin is surrounded by the state of Brandenburg, and Brandenburg's capital Potsdam is nearby. The urban area of Berlin has a population of over 4.6 million and is therefore the most populous urban area in Germany. The Berlin/Brandenburg Metropolitan Region, Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's second-largest metropolitan region after the Rhine-Ruhr region, as well as the List of EU metropolitan areas by GDP, fifth-biggest metropolitan region by GDP in the European Union. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mix & Genest
Mix & Genest was founded on 1 October 1879 by the businessman Wilhelm Mix and the engineer Werner Genest in Berlin-Schöneberg. The company was initially an 1879 branch of the ITT Corporation. It was very successful and became one of the pioneers in low voltage devices. Among the products were devices for telephony and telegraphy. By 1904 the company had already 2300 employees and subsidiaries in London and Amsterdam. In 1920 AEG The initials AEG are used for or may refer to: Common meanings * AEG (German company) ; AEG) was a German producer of electrical equipment. It was established in 1883 by Emil Rathenau as the ''Deutsche Edison-Gesellschaft für angewandte El ... bought the majority of the stock shares. Mix & Genest was acquired by the ITT Corporation in 1930. The name Mix & Genest was dropped in 1958. References Bibliography * —Festschrift 75 Jahre Mix & Genest 1879–1954. Mix-und-Genest-Aktiengesellschaft Stuttgart, Stuttgart-Zuffenhausen 1954. External ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Telephone And Telegraph
ITT Inc., formerly ITT Corporation, is an American worldwide manufacturing company based in Stamford, Connecticut. The company produces specialty components for the aerospace, transportation, energy and industrial markets. ITT's three businesses include Industrial Process, Motion Technologies, and Connect and Control Technologies. ITT has over 10,000 employees in more than 35 countries and serves customers in more than 100 countries. The company's long-standing brands include Goulds Pumps, Cannon connectors, KONI shock absorbers and Enidine energy absorption components. The company was founded in 1920 as International Telephone & Telegraph. During the 1960s and 1970s, under the leadership of CEO Harold Geneen, the company rose to prominence as the archetypal conglomerate, deriving its growth from hundreds of acquisitions in diversified industries. ITT divested its telecommunications assets in 1986. In 1995, the company sold off its hospitality portfolio, including Sherato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brussels
Brussels, officially the Brussels-Capital Region, (All text and all but one graphic show the English name as Brussels-Capital Region.) is a Communities, regions and language areas of Belgium#Regions, region of Belgium comprising #Municipalities, 19 municipalities, including the City of Brussels, which is the capital of Belgium. The Brussels-Capital Region is located in the central portion of the country. It is a part of both the French Community of Belgium and the Flemish Community, and is separate from the Flemish Region (Flanders), within which it forms an enclave, and the Walloon Region (Wallonia), located less than to the south. Brussels grew from a small rural settlement on the river Senne (river), Senne to become an important city-region in Europe. Since the end of the Second World War, it has been a major centre for international politics and home to numerous international organisations, politicians, Diplomacy, diplomats and civil servants. Brussels is the ''de facto' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Bell Telephone Company
The International Bell Telephone Company (IBTC) of Brussels, Belgium, was created in 1879 by the Bell Telephone Company of Boston, Massachusetts, a precursor entity to the American Telephone and Telegraph Company (AT&T), initially to sell imported telephones and switchboards in Continental Europe.Bob's Old PhonesEuropean Bell and Western Electric Phones Bob's Old Phones website. Retrieved August 17, 2010. IBTC evolved into a notable European telephone service provider and manufacturer, with major operations in several countries. As a result of anti-trust actions in the U.S., AT&T, its parent, sold its entire European division and IBTC's subsidiaries to the International Telephone & Telegraph Company in 1925, ending a 46-year presence on the continent. Organization In 1879 Gardiner Hubbard, father-in-law of Alexander Graham Bell and the first president of the Bell Telephone Company, founded the International Bell Telephone Company for promoting sales of its telephone equipment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antwerp
Antwerp (; ; ) is a City status in Belgium, city and a Municipalities of Belgium, municipality in the Flemish Region of Belgium. It is the capital and largest city of Antwerp Province, and the third-largest city in Belgium by area at , after Tournai and Couvin. With a population of 565,039, it is the List of most populous municipalities in Belgium, most populous municipality in Belgium, and with a metropolitan population of over 1.2 million people, the country's Metropolitan areas in Belgium, second-largest metropolitan area after Brussels. Definitions of metropolitan areas in Belgium. Flowing through Antwerp is the river Scheldt. Antwerp is linked to the North Sea by the river's Western Scheldt, Westerschelde estuary. It is about north of Brussels, and about south of the Netherlands, Dutch border. The Port of Antwerp is one of the biggest in the world, ranking second in Europe after Rotterdam and List of world's busiest container ports, within the top 20 globally. The city ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Telephone Manufacturing Company
The International Bell Telephone Company (IBTC) of Brussels, Brussels, Belgium, was created in 1879 by the Bell Telephone Company of Boston, Massachusetts, a precursor entity to the American Telephone and Telegraph Company (AT&T), initially to sell imported telephones and telephone switchboard, switchboards in Continental Europe.Bob's Old PhonesEuropean Bell and Western Electric Phones Bob's Old Phones website. Retrieved August 17, 2010. IBTC evolved into a notable European telephone company, telephone service provider and manufacturer, with major operations in several countries. As a result of anti-trust actions in the U.S., AT&T, its parent, sold its entire European division and IBTC's subsidiaries to the ITT Corporation, International Telephone & Telegraph Company in 1925, ending a 46-year presence on the continent. Organization In 1879 Gardiner Greene Hubbard, Gardiner Hubbard, father-in-law of Alexander Graham Bell and the first president of the Bell Telephone Company, foun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
