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Edwin Howard Armstrong
Edwin Howard Armstrong
Edwin Howard Armstrong
(December 18, 1890 – January 31, 1954) was an American electrical engineer and inventor, best known for developing FM (frequency modulation) radio and the superheterodyne receiver system. He held 42 patents and received numerous awards, including the first Medal of Honor awarded by the Institute of Radio Engineers (now IEEE), the French Legion of Honor, the 1941 Franklin Medal
Franklin Medal
and the 1942 Edison Medal
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Chelsea, Manhattan
Chelsea is a neighborhood on the West Side of the borough of Manhattan in New York City. The district's boundaries are roughly 14th Street to the south, the Hudson River
Hudson River
and West Street to the west, and Sixth Avenue to the east, with its northern boundary variously described as at or near the upper 20s[2][3] or 34th Street, the next major crosstown street to the north.[4][5] To the northwest of Chelsea is the neighborhood of Hell's Kitchen, as well as Hudson Yards; to the northeast are the Garment District and the remainder of Midtown South; to the east are NoMad
NoMad
and the Flatiron District; to the southwest is the Meatpacking District; and to the south and southeast are the West Village
West Village
and the remainder of Greenwich Village.[6][b] Chelsea is divided between Manhattan
Manhattan
Community Board 4 and Manhattan Community Board 5
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Office Of Alien Property Custodian
The Office of Alien Property Custodian
Office of Alien Property Custodian
was an office within the Government of the United States
United States
during World War I
World War I
and again during World War II, serving as a Custodian of Enemy Property to property that belonged to US enemies. World War I[edit]President Wilson with Mitchell Palmer, the first Alien Property CustodianPresident Woodrow Wilson
Woodrow Wilson
appointed A. Mitchell Palmer, a political ally and former Congressman, Alien Property Custodian in October 1917. Palmer held the position from October 22, 1917, until March 4, 1919. A wartime agency, the Custodian had responsibility for the seizure, administration, and sometimes the sale of enemy property in the United States
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Theta Xi
Theta Xi Fraternity (ΘΞ) is a North American Greek-letter social college fraternity. It was founded at Rensselaer Polytechnic Institute (RPI) on April 29, 1864. Of all the social fraternities today, Theta Xi was the only one founded during the Civil War. Its Grand Lodge is headquartered in suburban St. Louis, Missouri. Since its inception, Theta Xi has grown to include more than 60,000 initiated members. Currently, there are approximately 50 active chapters, and 3 colonies.Contents1 History 2 National Service Projects 3 Theta Xi Foundation 4 Notable alumni 5 List of Chapters and Colonies 6 See also 7 Footnotes 8 External linksHistory[edit] Theta Xi was founded on April 29, 1864 at Rensselaer Polytechnic Institute in Troy, New York as an engineering fraternity. Its founders were Peter Henry Fox, Ralph Gooding Packard, Christopher Champlin Waite, George Bradford Brainerd, Samuel Buel Jr., Henry Harrison Farnum, Thomas Cole Raymond, and Nathaniel Henry Starbuck
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New York (state)
New York is a state in the northeastern United States. New York was one of the original thirteen colonies that formed the United States. With an estimated 19.85 million residents in 2017,[4] it is the fourth most populous state. To differentiate from its city with the same name, it is sometimes called New York State. The state's most populous city, New York City
New York City
makes up over 40% of the state's population. Two-thirds of the state's population lives in the New York metropolitan area, and nearly 40% lives on Long Island.[9] The state and city were both named for the 17th-century Duke of York, the future King James II of England
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Mathematical Physics
Mathematical physics
Mathematical physics
refers to the development of mathematical methods for application to problems in physics. The Journal of Mathematical Physics
Physics
defines the field as "the application of mathematics to problems in physics and the development of mathematical methods suitable for such applications and for the formulation of physical theories".[1] It is a branch of applied mathematics, but deals with physical problems.Contents1 Scope1.1 Classical mechanics 1.2 Partial differential equations 1.3 Quantum theory 1.4 Relativity and Quantum Relativistic Theories 1.5 Statistical mechanics2 Usage2.1 Mathematical vs
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World War I
Allied victoryCentral Powers' victory on the Eastern Front nullified by defeat on the Western Front Fall of the German, Russian, Ottoman, and Austro-Hungarian empires Russian Civil War
Russian Civil War
and foundation of the Soviet Union Formation of new countries in Europe
Europe
and the Middle East Transfer of German colonies
German colonies
and regions of the former Ottoman Empire to other powers Establishment of the League of Nations
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Signal Corps (United States Army)
The United States
United States
Army Signal Corps (USASC) develops, tests, provides, and manages communications and information systems support for the command and control of combined arms forces. It was established in 1860, the brainchild of United States
United States
Army Major Albert J. Myer, and has had an important role from the American Civil War
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Oscillograph
An oscilloscope, previously called an oscillograph,[1][2] and informally known as a scope or o-scope, CRO (for cathode-ray oscilloscope), or DSO (for the more modern digital storage oscilloscope), is a type of electronic test instrument that allows observation of varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time. Other signals (such as sound or vibration) can be converted to voltages and displayed. Oscilloscopes are used to observe the change of an electrical signal over time, such that voltage and time describe a shape which is continuously graphed against a calibrated scale. The observed waveform can be analyzed for such properties as amplitude, frequency, rise time, time interval, distortion and others. Modern digital instruments may calculate and display these properties directly
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Electronic Oscillator
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.[1][2] Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices. Common examples of signals generated by oscillators include signals broadcast by radio and television transmitters, clock signals that regulate computers and quartz clocks, and the sounds produced by electronic beepers and video games.[1] Oscillators are often characterized by the frequency of their output signal:A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz
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Westinghouse Electric & Manufacturing Company
The Westinghouse Electric
Electric
Corporation was an American manufacturing company. It was founded on January 8, 1886, as Westinghouse Electric Company and later renamed Westinghouse Electric
Electric
Corporation by its founder George Westinghouse
George Westinghouse
(1846–1914). George Westinghouse
George Westinghouse
had previously founded the Westinghouse Air Brake Company
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Sydenham's Chorea
Sydenham's chorea
Sydenham's chorea
(SC) or chorea minor (historically and traditionally referred to as St Vitus' dance) is a disorder characterized by rapid, uncoordinated jerking movements primarily affecting the face, hands and feet.[1] Sydenham's chorea
Sydenham's chorea
results from childhood infection with Group A beta-haemolytic Streptococcus[2] and is reported to occur in 20–30% of patients with acute rheumatic fever (ARF). The disease is usually latent, occurring up to 6 months after the acute infection, but may occasionally be the presenting symptom of rheumatic fever. Sydenham's chorea
Sydenham's chorea
is more common in females than males and most patients are children, below 18 years of age
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David Sarnoff
David Sarnoff
David Sarnoff
(Belarusian: Даві́д Сарно́ў, Russian: Дави́д Сарно́в, February 27, 1891 – December 12, 1971) was an American businessman and pioneer of American radio and television. Throughout most of his career he led the Radio Corporation of America (RCA) in various capacities from shortly after its founding in 1919 until his retirement in 1970. He ruled over an ever-growing telecommunications and media empire that included both RCA
RCA
and NBC, and became one of the largest companies in the world
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John Renshaw Carson
John Renshaw Carson
John Renshaw Carson
(June 28, 1886 – October 31, 1940) was a noted transmission theorist for early communications systems
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Single-sideband Modulation
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation, used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently. Amplitude modulation
Amplitude modulation
produces an output signal that has twice the bandwidth of the original baseband signal
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Proceedings Of The IRE
The Proceedings of the IEEE is a monthly peer-reviewed scientific journal published by the Institute of Electrical and Electronics Engineers (IEEE). The journal focuses on electrical engineering and computer science. According to the Journal Citation Reports, the journal has a 2016 impact factor of 9.237, ranking it fifth in the category "Engineering, Electrical & Electronic."[1]Contents1 History of the Proceedings 2 Abstracting and indexing 3 References 4 Further reading 5 External linksHistory of the Proceedings[edit] The journal was established in 1909, known as the Proceedings of the Wireless Institute. Six issues were published under this banner by Greenleaf Pickard and Alfred Goldsmith
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