Experiments with high-frequency high-voltage currents led the inventor to discover a method for cleaning contaminated surfaces. A similar effect of currents on the skin showed that in this way it is possible to remove small rashes, clean pores and kill germs. This method is used in modern electrotherapy.
On October 12, 1887, Tesla gave a rigorous scientific description of the essence of the phenomenon of a rotating magnetic field. On May 1, 1888, Tesla received his main patents for the invention of multiphase electric machines (including an asynchronous electric motor) and a system for transmitting electricity by means of a multiphase alternating current. Using a two-phase system, which he considered the most economical, a number of industrial electrical installations were put into operation in the USA, including the Niagara Hydroelectric Power Station (1895), the largest in those years.
Tesla demonstrates the principles of radio communication, 1891
In 1891, at a public lecture, Tesla described and demonstrated the principles of radio communication. Tesla was one of the first to patent a method for reliably obtaining currents that can be used in radio communications. U.S. Patent 447,920, issued in the United States on March 10, 1891, described the "Method of Operating Arc Lamps" ("Method of Operating Arc-Lamps"), in which an alternating current generator produced high-frequency (by the standards of that time) current fluctuations of the order of 10,000 Hz. A patented innovation was the method of suppressing the sound produced by an arc lamp under the influence of alternating or pulsating current, for which Tesla came up with the idea of using frequencies that are beyond the perception of human hearing. According to the modern classification, the alternator operated in the range of very low radio frequencies.
In 1893, the scientist took up the issues of wireless communication and invented a mast antenna.
Nikola Tesla Awards:
1. Knight of the Montenegrin Order of Prince Danilo I, 2nd degree (1895).
2. Knight of the Grand Cross of the Order of the White Lion (Czechoslovakia) (1891),
3. Elliot Cresson Medal (1894),
4. Edison Medal (AIEE, 1916),
5. John Scott Medal (1934)
Tesla's name is very popular today. The unit of measurement of magnetic induction in the international system of SI units is named after Tesla. The airport in the Belgrade suburb of Surcin is named after Nikola Tesla. In Croatia, in the resort town of Porec (horv. Poreč), located on the western coast of the Istrian peninsula, there is an embankment named after Nikola Tesla. Streets in Zagreb, Sibenik, Split, Rijeka, Varazdin, Budva (Montenegro), Moscow (IC "Skolkovo"), Yekaterinburg, Teremakh, Lozhka, Astana, Minsk are named after Tesla. Monuments to Tesla are installed near the University of Belgrade, Belgrade International Airport, the Church of the Resurrection of Christ in Podgorica, as well as in the cities of New York (USA), Niagara Falls (USA), Prague (Czech Republic), Cheboksary (Russia), the capital of Azerbaijan Baku. In Cheboksary, on Ivan Yakovlev Avenue, there is a square named after N. Tesla. There is also the only monument to the inventor in Russia.
In 1970, the International Astronomical Union named a crater on the far side of the moon after Tesla. The asteroid (2244) is named after him Tesla. Thanks to a grant allocated by 2020 ($750,000), the Tesla Research Center in Wardencliff (New York, USA) will turn one laboratory into a museum of Tesla and his legacy, as well as an educational and research center; at the same time, a corresponding program in the field of entrepreneurship and technology will be created.
In the fall of 1937, in New York, 81-year-old Tesla left the New Yorker Hotel to feed the pigeons at the cathedral and library, as usual. Crossing the street a couple of blocks from the hotel, Tesla could not dodge a moving taxi and fell, suffering a back injury and a fracture of three ribs. Tesla refused the services of a doctor, which he followed before, and never fully recovered. The incident caused acute pneumonia, which turned into a chronic form. Tesla was bedridden for several months and was able to get up again in early 1938.
A war has begun in Europe. Tesla was deeply worried about his homeland, which was under occupation, repeatedly making fervent appeals for peace to all Slavs (in 1943, after his death, the first Guards Division of the People's Liberation Army of Yugoslavia was named Nikola Tesla for his courage and heroism). On January 1, 1943, Eleanor Roosevelt, the wife of the US president, expressed a wish to visit a sick Tesla. Tesla's nephew Sava Kosanovich visited him on January 5 and arranged a meeting. He was the last person to communicate with Tesla.
Nikola Tesla died in his New Yorker Hotel room on the night of January 7-8, 1943, at the 87th year of his life. The body was discovered on January 8 by the maid Alice Monahan, who entered the room despite the "do not disturb" sign posted by Tesla on January 5. According to the coroner's report, death occurred around 22:30 at night, presumably from coronary thrombosis. On January 12, the body was cremated, and the urn with the ashes was installed at Ferncliffe Cemetery in New York. In 1957, it was moved to the Nikola Tesla Museum in Belgrade.
Aliyev I. X.CEO of OOO «Electron Laboratory»,President of the Electron Scientific SchoolPHYSICAL AND MATHEMATICAL SCIENCES
CO
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GAS CONCENTRATION MONITORING DEVICEUDC 620.191
Qoldashov Obbozjon Xakimovich
Doctor of Technical Sciences, Professor of the Scientific Research Institute "Physics of Semiconductors and Microelectronics" at the National University of Uzbekistan
Bekchanov Ulugbek Qoziboy ogli
2nd year Master of the Department of "Physics of Semiconductors and Polymers" of the Faculty of Physics of the Mirzo Ulugbek National University of Uzbekistan
Scientific Research Institute «Physics of Semiconductors and Microelectronics» at the National University of Uzbekistan
Annotation. The article discusses the principles of constructing an optoelectronic device for monitoring the concentration of CO2 gases. Intense absorption lines of CO2 gases have been determined. The optoelectronic device uses LEDs based on GaAlAsSb/GaInAsSb/GaAlAsSb (3.12 microns) as the emitting diode at the reference wavelength, and LEDs based on GaAlAsSb/GaInAsSb/GaAlAsSb (3.39 microns) as the emitting diode at the measuring wavelength.
Keywords: gas analyzer, carbon dioxide, control, flowchart, time diagrams.
Аннотация. В статье рассматриваются принципы построения оптоэлектронного устройства для контроля концентрации CO2 газов. Определены интенсивные линии поглощения CO
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Ключевые слова: газоанализатор, углекислые газы, контроль, блок схема, временные диаграммы.
In recent years, more and more attention has been attracted to the problems of using clean unconventional renewable energy sources (NVE) for the needs of energy supply to various agricultural and industrial facilities. The relevance and prospects of this energy sector are due to two main factors: the catastrophically difficult situation of the environment and the need to search for new types of energy.
The successes achieved in the creation of wind, solar and a number of other types of unconventional power plants are widely covered in various works, recently much attention has been paid to geothermal energy. The prospects for using the Earth's heat energy are truly limitless, because under the surface of our planet, which is a giant natural energy boiler, huge reserves of heat and energy are concentrated.