Liénard System
Liénard is a surname. Notable people with the surname include: * François Liénard de la Mivoye (1782–1862), French-Mauritian naturalist * Édouard Liénard (1779–1848), French painter *Alfred-Marie Liénard (1869–1958), French physicist and engineer *Michel Joseph Napoléon Liénard (1810–1870), sculptor from France *Daniel Liénard de Beaujeu, French officer during the Seven Years' War *Liénard–Wiechert potential describes the electromagnetic effect of a moving electric charge *Liénard equation In mathematics, more specifically in the study of dynamical systems and differential equations, a Liénard equation is a second order differential equation, named after the French physicist Alfred-Marie Liénard. During the development of radio a ...

François Liénard De La Mivoye
François Liénard de la Mivoye (born 29 July 1782, Visakhapatnam, died 6 November 1862, Paris) was a Francophone Mauritian naturalist, ichthyologist, zoologist and mariner. He lived most of his life in Mauritius and, in 1829, was a founder member and treasurer of the ''société d'histoire natural locale'' alongside Charles Telfair, Wenceslas Bojer, Jacques Delisse and Julien Desjardins. In 1841 this became the ''Société Royale des arts et des Sciences de l'île Maurice''. The Society regularly sent fish specimens to Georges Cuvier in Paris and these were described in his 22 volume ''Histoire naturelle des poissons'', this was completed after Cuvier’s death by Achille Valenciennes. Liénard was responsible for describing a number of species including the now extinct Rodrigues giant day gecko (''Phesulma gigas''), Liénard being the last known person to see this species. Liénard is commemorated in the specific name of the predatory sea snail ''Conus lienardi''. He is also c ...
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Édouard Liénard
Jean Auguste Édouard Liénard (1779 in Paris – 10 February 1848 in Lille) was a French painter. He signed his works ''E.Liénard'' or ''J.Liénard''. A student of Regnault, Isabey and David, and worked for a long time as a painter of miniatures and portraits in Lille, where he succeeded François Watteau in 1823 as professor at the école des arts. He also worked for the Manufacture nationale de Sèvres from 1828 to 1833. His own students included Victor Mottez Victor-Louis Mottez (13 February 1809 – 7 June 1897) was a French fresco painter, painter and portraitist. Life He was born in Lille. His father was passionate about art and was himself a painter. Sent to Paris with a pension for some years, .... External links Works by Liénard {{DEFAULTSORT:Lienard 1779 births 1848 deaths 18th-century French painters French male painters 19th-century French painters Pupils of Jacques-Louis David 18th-century French male artists ...
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Alfred-Marie Liénard
Alfred-Marie Liénard (2 April 1869 in Amiens – 29 April 1958 in Paris), was a French physicist and engineer. He is most well known for his derivation of the Liénard–Wiechert potentials. From 1887 to 1889 Liénard was a student at the École Polytechnique and from 1889 to 1892 at the École des mines de Paris. From 1892 to 1895 he was a mining engineer in Valencia, Marseille, and Angers. From 1895 to 1908 he was professor at the École des Mines de Saint-Étienne and from 1908 to 1911 he was professor of electrical engineering at the École des Mines de Paris. In World War I he served in the French Army. Liénard worked in the fields of electricity, magnetism, and mechanics. In 1898 (and two years after him Emil Wiechert), he derived what is now called the Liénard–Wiechert potentials. He also investigated problems related to the elasticity and strength of materials, and wrote papers on thermodynamics and hydrodynamics. Along with M. H. Chipart, Liénard developed the ...
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Michel Joseph Napoléon Liénard
Michel Joseph Napoléon Liénard (1810–1870) was a French sculptor and ornamentalist. Works Variants of the same fountain design were used by Liénard multiple times, with minor alterations: * Brewer Fountain, Boston (Massachusetts, United States of America) * Steble Fountain, Liverpool (England, United Kingdom) * Tourny Fountain, Quebec City (Quebec, Canada), previously in Bordeaux (France) * Tourny Fountain, Soulac-sur-Mer (France) * Mail Fountain, Angers (France) * Fountain in Prince's Square, Launceston (Tasmania, Australia) * Fountain in the English garden in Geneva (Switzerland) Among his other fountains based on different designs: * Fontaine des-Arts-et-Metiers, Square Émile-Chautemps, Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. ... (1860). Reference ...
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Daniel Liénard De Beaujeu
Daniel Hyacinthe Liénard de Beaujeu (9 or 19 August 1711 – 9 July 1755) was a French officer during King George's War and the French and Indian War. He participated in the Battle of Grand Pre (1747). He also organized the force that attacked General Edward Braddock's army after it forded the Monongahela River. The event was later dubbed the Battle of the Monongahela. Beaujeu led his small force into the attack, where he was shot dead in the opening moments when the attack was launched on July 9, 1755. However, his adoption of Native American customs, such as wearing war paint and regalia, helped raise the morale and fighting tenacity of the warriors under his command. Biography Daniel Hyacinthe Liénard de Beaujeu was the son of Louis Liénard de Beaujeu and Denise-Thérèse Migeon. On March 4, 1737, he married Michelle-Elisabeth Foucault, with whom he had nine children.Genealogical Dictionary, Tanguay He was an officer during the French and Indian War. Recently sent to r ...
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Liénard–Wiechert Potential
The Liénard–Wiechert potentials describe the classical electromagnetic effect of a moving electric point charge in terms of a vector potential and a scalar potential in the Lorenz gauge. Stemming directly from Maxwell's equations, these describe the complete, relativistically correct, time-varying electromagnetic field for a point charge in arbitrary motion, but are not corrected for quantum mechanical effects. Electromagnetic radiation in the form of waves can be obtained from these potentials. These expressions were developed in part by Alfred-Marie Liénard in 1898 and independently by Emil Wiechert in 1900. Equations Definition of Liénard–Wiechert potentials The retarded time is defined, in the context of distributions of charges and currents, as :t_r(\mathbf,\mathbf, t) = t - \frac, \mathbf - \mathbf_s, , where \mathbf is the observation point, and \mathbf_s is the observed point subject to the variations of source charges and currents. For a moving point charg ...
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