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Lightning Detection
One of NOAA's National Severe Storms Laboratory Lightning Mapping Array (LMA) sensors A lightning detector is a device that detects lightning produced by thunderstorms. There are three primary types of detectors: ''ground-based'' systems using multiple antennas, ''mobile systems'' using a direction and a sense antenna in the same location (often aboard an aircraft), and ''space-based systems''. The first such device was invented in 1894 by Alexander Stepanovich Popov. It was also the first radio receiver in the world. Ground-based and mobile detectors calculate the direction and severity of lightning from the current location using radio direction-finding techniques along with an analysis of the characteristic frequencies emitted by lightning. Ground-based systems can use triangulation from multiple locations to determine distance, while mobile systems can estimate distance using signal frequency and attenuation. Space-based detectors on satellites can be used to locate light ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 08 10 Lightning Mapping Array-7497
1 (one, unit, unity) is a number, Numeral (linguistics), numeral, and glyph. It is the first and smallest Positive number, positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit (measurement), unit of counting or measurement, a determiner for singular nouns, and a gender-neutral pronoun. Historically, the representation of 1 evolved from ancient Sumerian and Babylonian symbols to the modern Arabic numeral. In mathematics, 1 is the multiplicative identity, meaning that any number multiplied by 1 equals the same number. 1 is by convention not considered a prime number. In Digital electronics, digital technology, 1 represents the "on" state in binary code, the foundation of computing. Philosophically, 1 symbolizes the ultimate reality or source of existence in various traditions. In math ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weather Radar
A weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation (meteorology), precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.). Modern weather radars are mostly pulse-Doppler radars, capable of detecting the motion of rain droplets in addition to the intensity of the precipitation. Both types of data can be analyzed to determine the structure of storms and their potential to cause severe weather. During Radar in World War II, World War II, radar operators discovered that weather was causing echoes on their screens, masking potential enemy targets. Techniques were developed to filter them, but scientists began to study the phenomenon. Soon after the war, military surplus, surplus radars were used to detect precipitation. Since then, weather radar has evolved and is used by national weather services, research departments in universities, and in television stations' weather d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coincidence Circuit
In physics and electrical engineering, a coincidence circuit or coincidence gate is an electronic device with one output and two (or more) inputs. The output activates only when the circuit receives signals within a time window accepted as ''at the same time'' and in parallel at both inputs. Coincidence circuits are widely used in particle detectors and in other areas of science and technology. Walther Bothe shared the Nobel Prize for Physics in 1954 "...for his discovery of the method of coincidence and the discoveries subsequently made by it." Bruno Rossi invented the electronic coincidence circuit for implementing the coincidence method. History Bothe and Geiger, 1924-1925 In his Nobel Prize lecture,{{cite web , url=http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html , title=Nobel Lecture , author=Bothe, Walther , year=1954 , publisher= Nobel Foundation Bothe described how he had implemented the coincidence method in an experiment on Compton s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RF Signal
Radio waves (formerly called Hertzian waves) are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths greater than , about the diameter of a grain of rice. Radio waves with frequencies above about 1 GHz and wavelengths shorter than 30 centimeters are called microwaves. Like all electromagnetic waves, radio waves in vacuum travel at the speed of light, and in the Earth's atmosphere at a slightly lower speed. Radio waves are generated by charged particles undergoing acceleration, such as time-varying electric currents. Naturally occurring radio waves are emitted by lightning and astronomical objects, and are part of the blackbody radiation emitted by all warm objects. Radio waves are generated artificially by an electronic device called a transmitter, which is connected to an antenna, which radiates the waves. They are received ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IC Lightning
Lightning is a natural phenomenon consisting of electrostatic discharges occurring through the atmosphere between two electrically charged regions. One or both regions are within the atmosphere, with the second region sometimes occurring on the land, ground. Following the lightning, the regions become partially or wholly electrically neutralized. Lightning involves a near-instantaneous release of energy on a scale averaging between 200 megajoules and 7 gigajoules. The air around the lightning flash rapidly heats to temperatures of about . There is an emission of electromagnetic radiation across a wide range of wavelengths, some visible as a bright flash. Lightning also causes thunder, a sound from the shock wave which develops as heated gases in the vicinity of the discharge experience a sudden increase in pressure. The most common occurrence of a lightning event is known as a thunderstorm, though they can also commonly occur in other types of energetic weather systems, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sensitivity (electronics)
The sensitivity of an electronic device, such as a communications system receiver, or detection device, such as a PIN diode, is the minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria. In general, it is the signal level required for a particular quality of received information. In signal processing, sensitivity also relates to bandwidth and noise floor as is explained in more detail below. In the field of electronics different definitions are used for sensitivity. The IEEE dictionary states: "Definitions of sensitivity fall into two contrasting categories." It also provides multiple definitions relevant to sensors among which 1: "(measuring devices) The ratio of the magnitude of its response to the magnitude of the quantity measured.” and 2: "(radio receiver or similar device) Taken as the minimum input signal required to produce a specified output signal having a specified sign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
False Signal , falsehood in Hindu mythology
{{Disambiguation ...
False or falsehood may refer to: *False (logic), the negation of truth in classical logic *Lie or falsehood, a type of deception in the form of an untruthful statement *False statement, aka a falsehood, falsity, misstatement or untruth, is a statement that is false *false (Unix), a Unix command * ''False'' (album), a 1992 album by Gorefest *Matthew Dear or False (born 1979), American DJ and producer * ''Falsehood'' (1952 film), an Italian melodrama film * ''Falsehood'' (2001 film), an American short film See also * *Anrita Adharma is the Sanskrit antonym of dharma. It means "that which is not in accord with the dharma". Connotations include betrayal, discord, disharmony, unnaturalness, wrongness, evil, immorality, unrighteousness, wickedness, and vice. Descripti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightning Mapper
Lightning is a natural phenomenon consisting of electrostatic discharges occurring through the atmosphere between two electrically charged regions. One or both regions are within the atmosphere, with the second region sometimes occurring on the ground. Following the lightning, the regions become partially or wholly electrically neutralized. Lightning involves a near-instantaneous release of energy on a scale averaging between 200 megajoules and 7 gigajoules. The air around the lightning flash rapidly heats to temperatures of about . There is an emission of electromagnetic radiation across a wide range of wavelengths, some visible as a bright flash. Lightning also causes thunder, a sound from the shock wave which develops as heated gases in the vicinity of the discharge experience a sudden increase in pressure. The most common occurrence of a lightning event is known as a thunderstorm, though they can also commonly occur in other types of energetic weather systems, such as vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Museu Romàntic Can Papiol
The Can Papiol Romanticism Museum () is a museum located in the historic centre of Vilanova i la Geltrú in Catalonia, Spain. It is a manor house dating from the end of the 18th century and is characteristic both for the furniture and decorative elements preserved from the time. Its aim is to evoke 19th-century society by analysing the everyday life of a well-to-do family of the time. The museum is part of the Barcelona Provincial Council Local Museum Network. History In 1959, a descendant of the Papiol family sold the house and all its furniture to Barcelona Provincial Council, to turn it into a museum. After some restoration work, the museum was opened in 1961 and the Romanticism Museum became a museum with two centres, one in Vilanova and one in Sitges, until 1995, when its management was split. The building Can Papiol is the manor house of the Papiol family. The building, comprising a ground floor, first floor, two upper floors and an attic, was built between 1790 and 1801 b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radome
A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar antenna (radio), antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and conceal antenna electronic equipment from view. They also protect nearby personnel from being accidentally struck by quickly rotating antennas. Radomes can be constructed in several shapes spherical, geodesic dome, geodesic, planar, etc. depending on the particular application, using various construction materials such as fiberglass, polytetrafluoroethylene, polytetrafluoroethylene (PTFE)-coated fabric, and others. In addition to radar protection, radomes on aircraft platforms also act as aircraft fairing, fairings that streamline the antenna system, thus reducing drag (physics), drag. When found on fixed-wing aircraft with forward-looking radar, as are commonly used for object or weather detection, the nose cones often additionally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Atmospherics
A radio atmospheric signal or sferic (sometimes also spelled "spheric") is a broadband electromagnetic impulse that occurs as a result of natural atmospheric lightning discharges. Sferics may propagate from their lightning source without major attenuation in the Earth–ionosphere waveguide, and can be received thousands of kilometres from their source. On a time-domain plot, a sferic may appear as a single high-amplitude spike in the time-domain data. On a spectrogram, a sferic appears as a vertical stripe (reflecting its broadband and impulsive nature) that may extend from a few kHz to several tens of kHz, depending on atmospheric conditions. Sferics received from about distance or greater have their frequencies slightly offset in time, producing ''tweeks''. When the electromagnetic energy from a sferic escapes the Earth-ionosphere waveguide and enters the magnetosphere, it becomes dispersed by the near-Earth plasma, forming a whistler signal. Because the source of the whis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
