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N Ray
N-rays (or N rays) were a hypothesized form of radiation described by :French physicists, French physicist Prosper-René Blondlot in 1903. They were initially confirmed by others, but subsequently found to be illusory. Background The N-ray affair occurred shortly after a series of major breakthroughs in experimental physics. Victor Schumann discovered vacuum ultraviolet radiation in 1893, Wilhelm Röntgen discovered X-rays in 1895, Henri Becquerel discovered nuclear radiation, radioactivity in 1896, and, in 1897, J. J. Thomson discovered electrons, showing that they were the constituents of cathode rays. This created an expectation within the scientific community that other forms of radiation might be discovered. At this time, Prosper-René Blondlot was a professor of physics at the Nancy-Université, University of Nancy studying electromagnetic radiation. Blondlot was a respected member of the scientific community: he was one of eight physicists who were corresponding ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speed Of Light
The speed of light in vacuum, commonly denoted , is a universal physical constant exactly equal to ). It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of second. The speed of light is invariant (physics), the same for all observers, no matter their relative velocity. It is the upper limit for the speed at which Information#Physics_and_determinacy, information, matter, or energy can travel through Space#Relativity, space. All forms of electromagnetic radiation, including visible light, travel at the speed of light. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and sensitive measurements, their finite speed has noticeable effects. Much starlight viewed on Earth is from the distant past, allowing humans to study the history of the universe by viewing distant objects. When Data communication, comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiritualism (beliefs)
Spiritualism is a metaphysical belief that the world is made up of at least two fundamental substances, matter and spirit. This very broad metaphysical distinction is further developed into many and various forms by the inclusion of details about what spiritual entities exist such as a soul, the afterlife, spirits of the dead, deities and mediums; as well as details about the nature of the relationship between spirit and matter. It may also refer to the philosophy, doctrine, or religion pertaining to a spiritual aspect of existence. It is also a term commonly used for various psychic or paranormal practices and beliefs recorded throughout humanity's history and in a variety of cultures. Spiritualistic traditions appear deeply rooted in shamanism and perhaps are one of the oldest forms of religion. Mediumship is a modern form of shamanism and such ideas are very much like those developed by Edward Burnett Tylor in his theory of animism; in which there are other parallel worlds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustave Le Bon
Charles-Marie Gustave Le Bon (7 May 1841 – 13 December 1931) was a leading French polymath whose areas of interest included anthropology, psychology, sociology, medicine, invention, and physics. He is best known for his 1895 work '' The Crowd: A Study of the Popular Mind'', which is considered one of the seminal works of crowd psychology. A native of Nogent-le-Rotrou, Le Bon qualified as a doctor of medicine at the University of Paris in 1866. He opted against the formal practice of medicine as a physician, instead beginning his writing career the same year of his graduation. He published a number of medical articles and books before joining the French Army after the outbreak of the Franco-Prussian War. Defeat in the war coupled with being a first-hand witness to the Paris Commune of 1871 strongly shaped Le Bon's worldview. He then travelled widely, touring Europe, Asia and North Africa. He analysed the peoples and the civilisations he encountered under the umbrella of the nas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archives D'électricité Médicale
An archive is an accumulation of historical records or materials, in any medium, or the physical facility in which they are located. Archives contain primary source documents that have accumulated over the course of an individual or organization's lifetime, and are kept to show the history and function of that person or organization. Professional archivists and historians generally understand archives to be records that have been naturally and necessarily generated as a product of regular legal, commercial, administrative, or social activities. They have been metaphorically defined as "the secretions of an organism", and are distinguished from documents that have been consciously written or created to communicate a particular message to posterity. In general, archives consist of records that have been selected for permanent or long-term preservation on the grounds of their enduring cultural, historical, or evidentiary value. Archival records are normally unpublished and alm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Wood
Green wood is wood that has been recently cut and therefore has not had an opportunity to wood drying, season (dry) by evaporation of the internal moisture. Green wood contains more moisture than seasoned wood, which has been dried through passage of time or by forced drying in kilns. Green wood is considered to have 100% water content, moisture content relative to air-dried or seasoned wood, which is considered to be 20%. Energy density charts for wood fuels tend to use air dried wood as their reference, thus oven dried or 0% moisture content can reflect 103.4% energy content. Combustion When green wood is used as fuel in appliances it releases less heat per unit of measure (usually Cord (unit), cords or tons) because of the heat consumed to evaporate the moisture. Used for grilling and smoking meat, it can impart the meat with an unpleasant flavor. The lower temperatures that result can lead to more creosote#Build-up in chimneys, creosote being created which is later deposited ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsène D'Arsonval
Arsène is a masculine French given name. It is derived from the Latin name ''Arsenius'', the Latinized form of the Greek name Ἀρσἐνιος (''Arsenios''), which means "male, virile". It has also been used as a surname. It may refer to: Given name * Arsène Alancourt (1904–1965), French professional road bicycle racer * Arsène Alexandre (1859–1937), French art critic * Arsène Auguste (1951–1993), Haitian footballer * Arsène Copa (born 1988), Gabonese footballer * Arsène Darmesteter (1846–1888), French philologist * Arsène de Cey (1806–1887), French playwright and novelist * Arsène Do Marcolino (born 1986), Gabonese footballer * Arsène Heitz (1908–1989), French draughtsman, co-creator of the Flag of Europe * Arsène Herbinier (1869–1955), French lithograph artist * Arsène Houssaye (1815–1896), French novelist and poet * Arsene James (1944–2018), Saint Lucian politician * Arsène Kra Konan (born 19??), Ivorian sprinter * Arsène Menessou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Augustin Charpentier
Pierre Marie Augustin Charpentier (15 June 1852 – 4 August 1916) was a French physician and professor of the University of Nancy. He is known for his work on human vision and optics, including the discovery of the size–weight illusion. Life Pierre Marie Augustin Charpentier was born in Argenton-sur-Creuse, France. in 1852. He was assistant of Edmund Landolt between 1875 and 1878. He studied medicine in Limoges, and defended his doctoral thesis in Paris in 1877. His thesis was related to vision (). In 1878, he was admitted together with , to the new the chair of physics and medicine of the University of Nancy, Charpentier leading the physics part. He becomes full professor of medicine in 1879. In 1888, he became the national correspondent of the physics and chemistry division for the Académie nationale de médecine. In 1900, he attended and presented a paper at the first International Congress of Physics, during the ''Exposition Universelle'', He replaced Jacqu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Western Europe, with a population of 14.9 million. London stands on the River Thames in southeast England, at the head of a tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Roman Empire, Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London, has been the centuries-long host of Government of the United Kingdom, the national government and Parliament of the United Kingdom, parliament. London grew rapidly 19th-century London, in the 19th century, becoming the world's List of largest cities throughout history, largest city at the time. Since the 19th cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longmans, Green & Co
Longman, also known as Pearson Longman, is a publishing company founded in 1724 in London, England, which is owned by Pearson PLC. Since 1968, Longman has been used primarily as an imprint by Pearson's Schools business. The Longman brand is also used for the Longman Schools in China and the '' Longman Dictionary''. History Beginnings The Longman company was founded by Thomas Longman (1699 – 18 June 1755), the son of Ezekiel Longman (died 1708), a gentleman of Bristol. Thomas was apprenticed in 1716 to John Osborn, a London bookseller, and at the expiration of his apprenticeship married Osborn's daughter. In August 1724, he purchased the stock and household goods of William Taylor, the first publisher of ''Robinson Crusoe'', for 9s 6d. Taylor's two shops in Paternoster Row, London, were known respectively as the ''Black Swan'' and the ''Ship'', premises at that time having signs rather than numbers, and became the publishing house premises. Longman entered in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spark Gap
A spark gap consists of an arrangement of two Conductor (material), conducting electrodes separated by a gap usually filled with a gas such as air, designed to allow an electric spark to pass between the conductors. When the potential difference between the conductors exceeds the breakdown voltage of the gas within the gap, a electric spark, spark forms, Ionization, ionizing the gas and drastically reducing its electrical resistance. An electric current then flows until the path of ionized gas is broken or the current reduces below a minimum value called the "holding current". This usually happens when the voltage drops, but in some cases occurs when the heated gas rises, stretching out and then breaking the wiktionary:filament, filament of ionized gas. Usually, the action of ionizing the gas is violent and disruptive, often leading to sound (ranging from a ''snap'' for a spark plug to thunder for a lightning discharge), light, and heat. Spark gaps were used historically in e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Spark
An electric spark is an abrupt electrical discharge that occurs when a sufficiently high electric field creates an Ionization, ionized, Electric current, electrically conductive channel through a normally-insulating medium, often air or other gases or gas mixtures. Michael Faraday described this phenomenon as "the beautiful flash of light attending the discharge of common electricity". The rapid transition from a non-conducting to a conductive state produces a brief emission of light and a sharp crack or snapping sound. A spark is created when the applied electric field exceeds the dielectric strength, dielectric breakdown strength of the intervening medium. For air, the breakdown strength is about 30 kV/cm at sea level. Experimentally, this figure tends to differ depending upon humidity, atmospheric pressure, shape of electrodes (needle and ground-plane, hemispherical etc.) and the corresponding spacing between them and even the type of waveform, whether sinusoidal or cosine-rec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
