Bibliographies thématiques / Relativity (physics) – popular works

Littérature scientifique sur le sujet « Relativity (physics) – popular works »

Auteur : Grafiati

Publié le 25 juillet 2024

Mis à jour le 26 juillet 2024

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Articles de revues sur le sujet "Relativity (physics) – popular works"

Capiberibe Nunes, Ricardo, Wivirkins Nogueira Marciel, Wellington Pereira de Queirós, Luiz Gonzaga Roversi Genovese et Jefferson Adriany Ribeiro da Cunha. « Uma Análise Histórica Do Filme Einstein E Eddington : Possíveis Contribuições Para O Ensino De Física ». História da Ciência e Ensino : construindo interfaces 22 (26 décembre 2020) : 162–85. http://dx.doi.org/10.23925/2178-2911.2020v22p162-185-161.

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ResumoUma obra semificcional é aquela que utiliza personagens e fatos históricos, envolvendo elementos de ficção. Nessa pesquisa, mostramos, a partir do filme Einstein e Eddigton, como essas obras podem ser usadas no ensino de ciências para fomentar discussões sobre a natureza da ciência bem como desenvolver o espírito questionador sobre as narrativas populares e sensos comuns. Assim, parte dessa pesquisa consiste de uma análise documental, em que foi utilizado estudos sobre a história da teoria da relatividade para analisar o filme, revelando alguns anacronismos sobre a relatividade, a mistificação do cientista Albert Einstein e algumas visões distorcidas da natureza do conhecimento científico. Ao final, mostramos como é possível transformar o filme em um recurso didático. Nessa direção, sugerimos algumas atividades pedagógicas de como utilizar o filme analisado como estratégia de ensino de física.Palavras-chave: Ensino de Física, Filmes, História da Ciência, Teoria da Relatividade.AbstractA semi fictional work is one that uses characters and historical facts, involving elements of fiction. In this research, we show, from the work Einstein and Eddigton, how these works can be used in science teaching to foster discussions about the nature of science as well as to develop the questioning spirit about popular narratives and common senses. Thus, part of this research consists of a documentary analysis, in which studies on the history of the theory of relativity were used to analyze the film, revealing some anachronisms about relativity, the mystification of the scientist Albert Einstein and some distorted views of the nature of scientific knowledge. At the end, we show how it is possible to transform the film into a didactic resource. In this direction, we suggest some pedagogical activities on how to use the analyzed film as a strategy for teaching physics.Keywords: Teaching Physics, Movies, History of Science, Theory of Relativity.

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Ma, Yunhao, Xiwei Fang, Xinyu Guan, Ke Li, Lei Chen et Fengwei An. « Five-Direction Occlusion Filling with Five Layer Parallel Two-Stage Pipeline for Stereo Matching with Sub-Pixel Disparity Map Estimation ». Sensors 22, n^o 22 (8 novembre 2022) : 8605. http://dx.doi.org/10.3390/s22228605.

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Binocular stereoscopic matching is an essential method in computer vision, imitating human binocular technology to obtain distance information. Among plentiful stereo matching algorithms, Semi-Global Matching (SGM) is recognized as one of the most popular vision algorithms due to its relatively low power consumption and high accuracy, resulting in many excellent SGM-based hardware accelerators. However, vision algorithms, including SGM, are still somewhat inaccurate in actual long-range applications. Therefore, this paper proposes a disparity improvement strategy based on subpixel interpolation and disparity optimization post-processing using an area optimization strategy, hardware-friendly divider, split look-up table, and the clock alignment multi-directional disparity occlusion filling, and depth acquisition based on floating-point operations. The hardware architecture based on optimization algorithms is on the Stratix-IV platform. It consumes about 5.6 K LUTs, 12.8 K registers, and 2.5 M bits of on-chip memory. Meanwhile, the non-occlusion error rate of only 4.61% is about 1% better than the state-of-the-art works in the KITTI2015 dataset. The maximum working frequency can reach up to 98.28 MHz for the 640 × 480 resolution video and 128 disparity range with the power dissipation of 1.459 W and 320 frames per second processing speed.

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Collamati, Anthony. « Review of Dark Energy : Hitchcock’s Absolute Camera and the Physics of Cinematic Spacetime ». CINEJ Cinema Journal 3, n^o 2 (13 octobre 2014) : 234–38. http://dx.doi.org/10.5195/cinej.2014.105.

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Skerry’s Dark Energy draws from astrophysics’ most popular and intriguing concepts—from Eisenstein’s theories of relativity to questions surrounding the expanding universe—and trace them metaphorically through Hitchcock’s films.

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Lekan, Thomas M. « “A Delicate Equilibrium of the Most Complex Sort” ». Historical Studies in the Natural Sciences 53, n^o 2 (1 avril 2023) : 147–88. http://dx.doi.org/10.1525/hsns.2023.53.2.147.

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This article examines the intertidal ecological research of the commercial lab owner and popular science writer Edward F. Ricketts, best known as the prototype for John Steinbeck’s character “Doc” in the novel Cannery Row (1945). Ricketts’s friendship with Steinbeck and unconventional philosophical style have regrettably overshadowed his scientific work, particularly his novel faunal zonation surveys of the North American Pacific littoral in the 1930s and 1940s. These surveys resulted in a landmark handbook, Between Pacific Tides (1939), designed for novices and specialists alike. Ricketts’s work demonstrates how the place of ecological investigation (Billick and Price)—here Monterey Bay’s pounding surf, storm-tossed debris, eclectic bohemianism, and the collaborative energies at Hopkins Marine Station—“imprinted” West Coast animal ecology. At first, Ricketts adopted the physiological methods and conceptions of ecological holism he had learned at the University of Chicago under mentor Warder C. Allee in the early 1920s. Allee had conducted his investigations of intertidal organisms in the relatively placid bays and estuaries at the Woods Hole research center on Cape Cod, Massachusetts. Allee envisioned animal aggregations as higher-order societies guided by “unconscious cooperation” and evolving toward a climax state. Yet Ricketts found that physiochemical factors, such as temperature and salinity, could not explain the distribution of organisms amid the Pacific’s far more precarious rough-and-tumble surf, nor could they account for fierce competition among organisms. Rejecting Allee’s cooperative metaphors, Ricketts came to see community structure as an unintended result of tidepool invertebrates’ Darwinian struggle to occupy resource niches—a “set of sieves” that transferred nourishment from one part of the aggregation to the next, binding it together in interlocking food webs. Through dialogue with Steinbeck about the implications of modern physics during their Sea of Cortez voyage (1940), Ricketts developed a “unified field hypothesis” to conceptualize the dynamic interwovenness created by transfers of metabolic energy. Yet Steinbeck ultimately held fast to a super-organismic understanding of ecological holism—a hierarchical relationship between constituents and the whole that underlays the novelist’s idea of the human “phalanx” in Grapes of Wrath and other works. The article offers new insights about the ecological origins of Steinbeck and Ricketts’s disputes over “non-teleological” reasoning and the pair’s divergent understandings of nature, society, and progressive politics.

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Erawati, Ni Ketut Ratna. « The Relativity Strategy of Old Javanese ». Journal of Language Teaching and Research 8, n^o 6 (1 novembre 2017) : 1100. http://dx.doi.org/10.17507/jltr.0806.10.

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Old Javanese is one of the temporal dialects in Indonesia that is estimated to develop from the IX-XV century. The language has a lot of langues inherited in the form of literature kakawin (Old Javanese poetry) and the form of parwa (Old Javanese language prose) until now. Literary works in the form kakawin and parwa are very popular work to be sung in Balinese society especially in religious ceremonies. Therefore, the Old Javanese is very worthy of being used as a linguistic study even though the language is categorized as a dead language. In morphological typology, Old Javanese is an agglutinative type. On the other hand, syntactically the Old Javanese language includes the Split-S typology. Associated with morphological typology and syntax, the Old Javanese has a core system or verb. Thus, the Old Javanese has various forms of verb-alternation in clause structures, either in single clauses or complex clauses. Relative clauses are one part of the complex clause having a change of grammatical relation when the insertion of certain linguistic elements. The topic of this study was the relativity strategy in Old Javanese. The relativity strategy of Old Javanese was described with related theories and concepts. Based on the result the Old Javanese could make the subject to be relative by inserting element of the relative sang and ikang. On the other hand there was also an indirect relativity by marking of verbs and penloping.

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Shi, Yu. « Hunting the gravitational waves : From Einstein to LIGO ». International Journal of Modern Physics D 28, n^o 04 (mars 2019) : 1930008. http://dx.doi.org/10.1142/s0218271819300088.

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This is a popular introduction to the scientific background of the detection of gravitational waves, starting from relativity and gravitation. It originates in a Chinese popular article the author wrote for the second Fudan-Zhongzhi Science Award presented to the three scientists who twelve days later also received the 2017 Nobel Prize in Physics.

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SALTI, MUSTAFA. « DIFFERENT APPROACHES FOR MØLLER'S ENERGY IN THE KASNER-TYPE SPACETIME ». Modern Physics Letters A 20, n^o 28 (14 septembre 2005) : 2175–82. http://dx.doi.org/10.1142/s0217732305017901.

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Considering the Møller energy definition in both Einstein's theory of general relativity and tele-parallel theory of gravity, we find the energy of the universe based on viscous Kasner-type metrics. The energy distribution which includes both the matter and gravitational field is found to be zero in both of these different gravitation theories and this result agrees with previous works of Cooperstock and Israelit et al., Banerjee–Sen, Vargas who investigated the problem of the energy in Friedmann–Robertson–Walker universe in Einstein's theory of general relativity and Aydogdu–Saltı who considered the same problem in tele-parallel gravity. In all of these works, they found that the energy of the Friedmann–Robertson–Walker spacetime is zero. Our result is the same as that obtained in the studies of Saltı and Havare. They used the viscous Kasner-type metric and found the total energy and momentum by using Bergmann–Thomson energy–momentum formulation in both general relativity and tele-parallel gravity. The result that the total energy and momentum components of the universe is zero supports the viewpoints of Albrow and Tryon.

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Huguet, E., M. Le Delliou et M. Fontanini. « Cartan approach to Teleparallel Equivalent to General Relativity : A review ». International Journal of Geometric Methods in Modern Physics 18, supp01 (24 février 2021) : 2140004. http://dx.doi.org/10.1142/s0219887821400041.

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In previous works, questioning the mathematical nature of the connection in the translations gauge theory formulation of Teleparallel Equivalent to General Relativity (TEGR) Theory led us to propose a new formulation using a Cartan connection. In this review, we summarize the presentation of that proposal and discuss it from a gauge theoretic perspective.

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AYDOGDU, OKTAY. « MØLLER ENERGY–MOMENTUM PRESCRIPTION FOR A LOCALLY ROTATIONALLY SYMMETRIC SPACE–TIME ». International Journal of Modern Physics A 21, n^o 18 (20 juillet 2006) : 3845–53. http://dx.doi.org/10.1142/s0217751x06030990.

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The energy distribution in the Locally Rotationally Symmetric (LRS) Bianchi type II space–time is obtained by considering the Møller energy–momentum definition in both Einstein's theory of general relativity and teleparallel theory of relativity. The energy distribution which includes both the matter and gravitational field is found to be zero in both of these different gravitation theories. This result agrees with previous works of Cooperstock and Israelit, Rosen, Johri et al., Banerjee and Sen, Vargas, and Aydogdu and Salti. Our result — the total energy of the universe is zero — supports the view points of Albrow and Tryon.

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Güémez, J., et M. Fiolhais. « A 4-vector formalism for classical mechanics ». Revista Brasileira de Ensino de Física 35, n^o 4 (décembre 2013) : 1–13. http://dx.doi.org/10.1590/s1806-11172013000400010.

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We present a matrix formalism, inspired by the Minkowski four-vectors of special relativity, useful to solve classical physics problems related to both mechanics and thermodynamics. The formalism turns out to be convenient to deal with exercises involving non-conservative forces and production or destruction of mechanical energy. On the other hand, it provides a framework to treat straightforwardly changes of inertial reference frames, since it embodies the Principle of Relativity. We apply the formalism to a few cases to better show how it works.

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Thèses sur le sujet "Relativity (physics) – popular works"

Göransdotter, Rebecka. « Ett genis trovärdighet : En retorisk analys av Albert Einsteins vetenskapliga ethos ». Thesis, Uppsala universitet, Litteraturvetenskapliga institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-354326.

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Albert Einstein published the English translation of Relativity: The Special and General Theory in the midst of two big events in 1920: the confirmation of the two theories of relativity and spacetime in 1919 and the Nobel prize in physics in 1921. The new global celebrity wanted to make the theories intelligible and readable for an international English-speaking audience, an audience that also included antagonistic scientists and even anti-Semites. The aim of this thesis is to do a rhetorical analysis of Einstein’s character, his ethos, in Relativity, with a specific focus on creation of credibility in regard to his historical context: scientific ideals, values and norms as well as the political and cultural tendencies in Europe during the early 20th century. This was done firstly by identifying the implied auditor. Secondly, based on the material, I have identified three stereotypes or characters – the professional idealist, the mentor and the internationalist – which emphases different features and capacities that are crucial for the credibility of the text. Thirdly, by using these stereotypes and in regard to the specific historical context, I investigated how Einstein developed his primary ethos into a secondary ethos in the text. The rhetorical analysis of Einstein’s Relativity shows that his ethos stands in relation to the social and cultural perception of the virtuous epistemic scientist; to fight prejudices regarding being a Jewish-German theoretical physicist; and, noteworthy, a way to produce a well-needed international space – a crucial alternative to continue the positivistic knowledge production counter to the nationalistic project.

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Livres sur le sujet "Relativity (physics) – popular works"

Wolfson, Richard. Simply Einstein : Relativity demystified. New York : W.W. Norton, 2003.

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McMahon, David. Relativity Demystified. New York : McGraw-Hill, 2006.

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Schwartz, Jacob T. Relativity in illustrations. New York : Dover Publications, 1989.

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Gregersen, Erik. The Britannica guide to relativity and quantum mechanics. New York : Britannica Educational Pub. in association with Rosen Educational Services, 2011.

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Steane, Andrew M. The wonderful world of relativity : A precise guide for the general reader. Oxford : Oxford University Press, 2011.

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Larson, Drake. The cults of relativity : Finding Einstein, Twain and a universe beyond E=mc2. Ashland, Or : Hellgate Press, 2008.

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Einstein, Albert. Theory of relativity and other essays. New York, NY : MJF Books, 1998.

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Finck, Frederick P. F=ma to E=mc² : Relativity made easy. New York : Vantage Press, 2006.

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Fritzsch, Harald. An equation that changed the world : Newton, Einstein, and the theory of relativity. Chicago : University of Chicago Press, 1994.

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Orzel, Chad. How to teach relativity to your dog. New York : Basic Books, 2012.

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Chapitres de livres sur le sujet "Relativity (physics) – popular works"

Emam, Moataz H. « Generalizing General Relativity ». Dans Covariant Physics, 358–73. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198864899.003.0010.

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In this chapter we review 5 popular models of modifying and/or generalizing our current understanding of spacetime. These are: Brans-Dicke theory, f(R) theory, Gauss-Bonnet theory, Kaluza-Klein theory, and finally Cartan’s theory of gravity.

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Ebury, Katherine. « The Scientific Revolution ». Dans The Oxford Handbook of W.B. Yeats, 351—C23N45. Oxford University Press, 2023. http://dx.doi.org/10.1093/oxfordhb/9780198834670.013.7.

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Abstract Yeats’s reading in modern science post-relativity has recently come strongly into the light, placing him in a fascinating position among modern writers, open to scientific thinking that appears to challenge the empiricism that Yeats himself abhorred. This chapter reappraises previous critical work on Yeats and science, especially in relation to the ‘Two Cultures’ debate (and its ancestors) and highlights missed opportunities to engage with the potential of his thought. Subsections address Yeats’s experience of science before Einstein through his education, as well as how his engagement with science was transformed after the Einsteinian revolution. Yeats’s thought will ultimately be found to be less of an outlier and more in harmony with a particular strand of ‘New Age’ popular science, from Einstein’s Cosmic Religion (1931) to Gary Zukav’s The Dancing Wu Li Masters (1979), which combined Eastern philosophy with the new physics.

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Gudel, Kurt, Solomon Feferman, John W. Dawson, Stephen C. Kleene, Gregory H. Moore, Robert M. Solovay et Jean van Heijenoort. « Rotating universes in general relativity theory(1952) ». Dans Collected Works, 208–16. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195147216.003.0016.

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Abstract In such a coordinate system, however, since parallel displacement (in its 176 origin) means constancy of the components, the angular velocity relative to the compass of inertia, in 0, is given by the same expressions as in Newtonian physics, i.e. the right-hand sides of (8) are its components. Evidently ω is the only vector the first 3 components of which, in the particular coordinate systems defined, coincide with the angular velocity computed as in Newtonian physics and the 4th component is 0.

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Perkowitz, Sidney. « 3. How physics works ». Dans Physics : A Very Short Introduction, 40–62. Oxford University Press, 2019. http://dx.doi.org/10.1093/actrade/9780198813941.003.0003.

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Today, physics is firmly grounded in classical physics, which accurately describes much of our immediate and relatively nearby world, the mid-range scale of the cosmos; and in modern physics, quantum mechanics and relativity, which describe much of the small and large scales of the universe that lie far beyond direct human reach. However, physics is not stagnant, it still lacks important answers because of unexplained phenomena, because of new research tools, and because its aspirations, especially the quest for a Theory of Everything, have grown. ‘How physics works’ considers how physicists choose which experiments to perform, how to develop theories, and how these two halves of the physics equation come together.

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Wells, Jamin. « Clearing the Coast ». Dans Shipwrecked, 105–36. University of North Carolina Press, 2020. http://dx.doi.org/10.5149/northcarolina/9781469660905.003.0005.

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This chapter focuses on a lesser-known industry that transformed the physical coastline as well as popular representations of shipwrecks and the shore. It traces the evolution of the marine salvage business from a part-time, ad-hoc enterprise of coastal inhabitants into a sophisticated, capital-intensive industry of urban laborers though a case study of the career of Captain Thomas A. Scott. Drawing on extensive newspaper and archival research, this chapter shows how corporate salvors turned shipwrecks into relatively mundane service work and the coast into the workplace of modern professionals and a pristine play space for urban pleasure seekers.

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Keyes, Ralph. « Ivy-Covered Words ». Dans The Hidden History of Coined Words, 145–60. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190466763.003.0013.

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Words and phrases coined by scholars that become part of the vernacular usually have popular resonance: pecking order, natural selection, meme. Some scholars have coined more than their share of such neologisms. Darwin was a prolific coiner and importer of terms such as cross-fertilize, subgroup, and alfalfa. Darwin’s London neighbor Dr. William Gowers contributed knee-jerk (for the reflexive jerk of a tapped knee). Robert Merton added self-fulfilling prophecy, role model, and focused interview, Abraham Maslow hierarchy of needs and peak experience. In some cases neologisms related to academic discoveries were created by “interpreters”: theory of relativity (Max Planck), focus group (Ernest Dichter), body language (Julius Fast). As with books from the world of popular publishing, some of these new words and phrases appeared in the titles of more scholarly works. They include Bowling Alone, Personal Space, and Holism and Evolution.

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Jaszczolt, K. M. « Real time and the concept of time ». Dans Representing Time : An Essay on Temporality as Modality, 5–31. Oxford University PressOxford, 2009. http://dx.doi.org/10.1093/oso/9780199214433.003.0002.

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Abstract The big questions to be addressed in this chapter are the following. On the one hand, we know even from a basic understanding of physics and from popular knowledge of Einstein’s theory of relativity that time is not absolute: it varies depending on the frame of reference, the velocity with which objects are moving. On the other, we have a very robust and deep-seated conviction, grounded in everyday experience, that there is something we can unequivocally call the past, the present, and the future.

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O'Connor, Patrick. « Older than Language : Cormac McCarthy on Language and Evolution in Whales and Men and ‘The Kekulé Problem’ ». Dans Cormac McCarthy, Philosophy and the Physics of the Damned, 13–36. Edinburgh University Press, 2022. http://dx.doi.org/10.3366/edinburgh/9781474497268.003.0002.

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This chapter develops McCarthy’s enquiries into language, evolution, and the unconscious. The importance of this chapter rests on the fact that there has been no thoroughgoing analysis incorporating McCarthy’s philosophical observations on the relationship between language, evolutionary science, and the unconscious. Building on McCarthy’s archival materials, specifically the screenplay Whales and Men, and his recent essay in the popular science magazine Nautilus and its rejoinder, as well as the literary works themselves, I reveal how McCarthy conceives of language, evolution and the unconscious philosophically.

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Jones, Richard A. L. « The Brownian universe : physics at the nanoscale ». Dans Soft Machines, 54–87. Oxford University PressOxford, 2004. http://dx.doi.org/10.1093/oso/9780198528555.003.0004.

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Abstract People who write about the history of ideas know that great works of literature can change the way people think. But popular films, trashy genre novels, and cheesy television shows can change the intellectual climate just as much as high art can. I am sure that the way people think about nanotechnology now has been profoundly changed by the 1966 science fiction film ‘Fantastic voyage’, later made into a novel by Isaac Asimov and spun out into a Saturday morning television series. The heroes of the film have to save the life of a scientist who knows vital secrets, but who lies in a coma following an attack by the bad guys. He has a blood clot on his brain, inoperable unless the brain surgeon and his team are shrunk to the size of microbes and injected into the scientist’s bloodstream in a similarly sunken submarine. After a series of misadventures, our plucky team manage to destroy the blood clot with (shrunken) laser guns and swim to safety, after their submarine is consumed by a white blood cell.

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Smethurst, James Edward. « The Popular Front, World War II, and the Rise of Neomodernism in African-American Poetry of the 1940s ». Dans The New Red Negro, 180–207. Oxford University PressNew York, NY, 1999. http://dx.doi.org/10.1093/oso/9780195120547.003.0008.

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Abstract Despite the obvious differences between the “popular”neomodernism exemplified by the work of Hughes in the 1940s and the “high”neomodernism of which Brooks was the leading exponent, both neomodernist tendencies had in common an urban and largely northern landscape in which the ghetto, rather than the plantation or tenant farm, increasingly became the locus of authentic African-American culture. African-American communities in the North, notably Harlem and the South Side of Chicago, were seen not as either a “refuge”or as a place of alienation where the urculture of the rural immigrant is distorted or destroyed, but instead as “home”(as Amiri Baraka was to later title a collection of essays describing his intellectual journey to cultural nationalism mirroring his physical journey from the Lower East Side to Harlem). If life in the ghettos of the North and West was depicted as alienating, it was an alienation that was seen increasingly as typical of African-American life in the United States.There were, of course, certain empirical pressures for such a redefinition of “home,”the most important being that by the 1940s African Americans in the cities outnumbered those in the country for the first time in U.S. history. By the end of the decade, 62 percent of the African-American population was urbanized.2 In the 1940s, changes in agricultural technology greatly reduced sharecropping. At the same time, the new demand for labor by the war industries and the relatively egalitarian policies of the CIO unions, particularly those led by the Communist Left, vastly increased the number and status of African-American industrial workers.

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Actes de conférences sur le sujet "Relativity (physics) – popular works"

Both, Jakub, et Nicolas Barnafi. « ITERATIVE QUASI-NEWTON SOLVERS FOR POROMECHANICS APPLIED TO HEART PERFUSION ». Dans VI ECCOMAS Young Investigators Conference. València : Editorial Universitat Politècnica de València, 2021. http://dx.doi.org/10.4995/yic2021.2021.12324.

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Sequential block-partitioned solvers have in the recent past been quite popular for multi-physics and in particular poroelasticity models. Such enable tailored solver technology for the respective single-physics problems via iterative coupling, as well as suggest suitable block-preconditioners for monolithic solvers.In this talk, we focus on a thermodynamically consistent poroelasticity model recently proposed. It extends the classical quasi-static Biot equations by incoporating inertia contributions in both solid and fluid equations, aiming at biomedical applications; for instance, the perfusion of the heart.Following ideas and techniques from previous works, we present block-partitioned solvers for the fully dynamic poroelasticity model supported by theoretical convergence analysis.

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Khan, Jobaidur R., et Mosfequr Rahman. « Stress Analysis of Various Shaped Blade of Savonius Wind Turbine ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36307.

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Amidst of high demand of energy, the world is seeking alternative energy sources. Wind alone can fulfill most of the energy requirement of the world by its efficient conversion into energy. On efficiency measurement, Horizontal Axis Wind Turbines (HAWT) is the popular to the researchers, but it works best in places where the wind is not disturbed and has high wind power. The inherent advantage of facing the wind direction, design simplicity, less expensive technology for construction, lower wind start-up speeds, easier maintenance, and relatively quietness are turning the focus to Vertical Axis Wind Turbine (VAWT). The low wind speed and non-smooth wind flow regions are attracted for these machines. Savonius turbine is the simplest form of VAWT and operation is based on the difference of the drag force on its blades. The main objective of this study is to analyze a perfect mixture of new and innovative designs of Savonius turbine blades, which can make VAWT more attractive, efficient, durable and sustainable. This is studied by using blade with different numbers in operating in different wind speed. A Computational Fluid Dynamics (CFD) analysis has been used. 2D CAD models of various VAWT geometries are created and tested with CFD software ANSYS/FLUENT with a similar flow-driven motion in a wind tunnel. These simulations provided the aero-dynamic characteristics like shear stress, velocity distribution and pressure distribution. Some physical models with desired properties needed to be fabricated and tested inside tunnel to find the effect of different shapes in real.

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Ramani, Keval S., Ehsan Malekipour et Chinedum E. Okwudire. « Toward Intelligent Online Scan Sequence Optimization for Uniform Temperature Distribution in LPBF Additive Manufacturing ». Dans ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63870.

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Abstract Laser powder bed fusion (LPBF) is an increasingly popular approach for additive manufacturing (AM) of metals. However, parts produced by LPBF are prone to residual stresses, deformations, and other defects linked to nonuniform temperature distribution during the process. Several works have highlighted the important role (laser) scanning strategies, including laser power, scan speed, scan pattern and scan sequence, play in achieving uniform temperature distribution in LPBF. However, scan sequence continues to be determined offline based on trial-and-error or heuristics, which are neither optimal nor generalizable. To address these weaknesses, we present a framework for intelligent online scan sequence optimization to achieve uniform temperature distribution in LPBF. The framework involves the use of physics-based models for online optimization of scan sequence, while data acquired from in-situ thermal sensors provide correction or calibration of the models. The proposed framework depends on having: (1) LPBF machines capable of adjusting scan sequence in real-time; and (2) accurate and computationally efficient models and optimization approaches that can be efficiently executed online. The first challenge is addressed via a commercially available open-architecture LPBF machine. As a preliminary step towards tackling the second challenge, an analytical model is explored for determining the optimal sequence for scanning patterns in LPBF. The model is found to be deficient but provides useful insights into future work in this direction.

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Dartnall, John, et Stephen Johnston. « Trend-Morph-PDS : A Methodology for Innovative (Mechanical) Engineering Design ». Dans ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58301.

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The paper describes a design methodology, TREND-MORPH-PDS, an original contribution to design science. It is a relatively simple methodology that has grown from efforts to innovate mechanical machines with their strong dependence on solid (geometrical) reasoning. The approach focuses on combinatorial methods of invention/innovation/design emphasizing the manipulation of form (as distinct from the manipulation of function alone) that help the designer to generate a wide range of good design alternatives. The first premise of this approach is that the elements and functions of mature technologies such as mechanical machines are well documented and understood. Thus, innovations are more likely to involve new combinations of existing forms than the introduction of new machine elements. The second premise is that valuable information is available about most elements and the more popular subsystems and machines. That information has evolved, sometimes over time spans ranging to hundreds of years, but usually has not been systematically documented and categorised, thus leaving opportunities to investigate these areas and discover good design possibilities. Further, some valuable information is available only anecdotally or is tightly held by the managements of the companies that have manufactured the device(s) or own the intellectual rights. The TREND-MORPH-PDS methodology involves three phases: 1. TREND: Start with a general goal or goals. Break this down into sub-areas/systems, including: socio-economic, near physical environment, power source, prime mover, gearing/matching, transmission, working sub-system and control system. Research and document historical trends in each of these areas and their possible influences on the design. 2. MORPH: Apply morphological analysis to each sub-system, using rapid graphical techniques. Move to detail design for specific alternatives as satisficing sub-systems are identified. 3. PDS: At all times during these stages, take advantage of design knowledge/tools that are currently available, looking for ideas and opportunities. Work constantly on constructing the Product Design Specification (PDS). The conceptual design is complete when the PDS is finalized. Detail design, which would follow from the PDS, is not treated in this paper. We illustrate the methodology with a case study of a morphological analysis of a ground water pumping system suitable for low volume flow pumping.

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