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Two-mass-skate Bicycle
A two-mass-skate bicycle (TMS) is a theoretical model created by a team of researchers at Cornell University, University of Wisconsin-Stout, and Delft University of Technology to show that it is neither sufficient nor necessary for a bike to have Bicycle and motorcycle dynamics#Gyroscopic effects, gyroscopic effects or Bicycle and motorcycle dynamics#Trail, positive trail to be Bicycle and motorcycle dynamics#Self-stability, self-stable. The two-mass and skates aspects of the model were chosen to eliminate design parameters so that the nine that remain, the locations of the masses and the steering geometry, could be more easily analyzed. Instead of full inertia tensors, the total mass of the bike is reduced to just two point masses, one attached to the bicycle frame, rear frame and one attached to the bicycle fork, front fork. Instead of rotating bicycle wheel, wheels, the Nonholonomic system, non-holonomic ground contacts are provided by small-radius Ice skate, skates. History ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emmanuel Carvallo
Emmanuel Carvallo (1856–1945) was a French mathematician born in Narbonne. He is notable for showing in 1897 that bicycles could be self-stable, for opposing wave models of X-ray An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ran ...s in 1900, and for claiming in 1912 that Einstein's Theory of Relativity had been proven false. References French mathematicians {{France-mathematician-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science Friday
''Science Friday'' (known as ''SciFri'' for short) is a weekly call-in talk show that broadcasts each Friday on public radio stations, distributed by WNYC Studios, and carried on over 500 public radio stations. ''SciFri'' is hosted by science journalist Ira Flatow and Flora Lichtman and is produced by the Science Friday Initiative. The program is divided into two one-hour programs, with each hour ending with a complete sign-off. The focus of each program is news and information on science, nature, medicine, and technology. The show originated as the Friday episode of the daily call-in talk show '' Talk of the Nation'', but was spun off as a series in its own right when ''Talk of the Nation'' was canceled in June 2013. The ''Science Friday'' radio program is produced by the Science Friday Initiative, a 501(c)(3) organization. The Science Friday Initiative is an independently run organization with a governing board of directors and executive director. In addition to the rad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycle Quarterly
__NOTOC__ ''Bicycle Quarterly'' is a magazine examining the history of bicycles, their design and evolution, with emphasis on Randonneuring bicycles. Articles evaluate equipment and bicycles for performance and function, and include footnotes. The magazine was formerly known as ''Vintage Bicycle Quarterly''. Overview The magazine is published by Bicycle Quarterly Press and edited by Jan Heine, of Seattle, Washington in the United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 .... According to the group, "Randonneurs USA," ''Bicycle Quarterly'' is "a publication dedicated to classic lightweight bikes, particularly French ones such as Alex Singer and Rene Herse." In a 2009 article in ''Bicycle Times'', Marie Autrey described ''Bicycle Quarterly'' as "Part anthropology jou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dave Moulton
Edward David Moulton (born 8 February 1936) is a British custom bicycle frame builder and internet blogger based in the United States. Dave Moulton studied at Luton Technical College in England and learned bicycle frame building from Albert "Pop" Hodge in Luton, beginning in 1957. He opened a frame-building business around 1975 in Worcester, England. In 1976, Paul Carbutt rode one of Moulton's bicycles in the Olympics in Montreal, Quebec, Canada. The bike frames were marked with Moulton's name, "Dave Moulton" in large lower-case letters. Moulton began receiving orders from the United States due to the increasing popularity of cycling as a sport and the scarcity of master frame-builders there. In 1979 Moulton emigrated to the United States and went to work for Vic and Mike Fraysse in Ridgefield Park, New Jersey. He built bicycles for them under the ''Paris Sport'' brand that were used by the US Olympic Cycling Team. In 1980 he went to work for Masi Bicycles in California ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Cycle
An ice cycle, ice bike, or icycle is a bicycle adapted for use on ice, usually by replacing the front wheel with an ice skate. Versions exist with and without additional skates to provide lateral stability, that have been based on upright bicycle, upright and recumbent bicycle, recumbent bikes, and that have been used for racing. Ice cycles have been in use since at least the 1890s, and theory predicts that a bicycle with a front skate can exhibit riderless self-stability similar to the same bicycle with a front wheel. At least one example has been made with both the front and the rear wheels replaced by skates. Gallery File:Icycle front detail.jpg, Front skate of Icycle File:Icycle rear detail.jpg, Rear wheel of Icycle File:Icetrack bike.jpg, Icetrack bike See also *Bicycle fairing *Cold-weather biking *Icetrack cycling *Two-mass-skate bicycle *Skibob References {{Authority control Cycle types Bicycles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wired (magazine)
''Wired'' is a bi-monthly American magazine that focuses on how emerging technologies affect culture, the economy, and politics. It is published in both print and Online magazine, online editions by Condé Nast. The magazine has been in publication since its launch in January 1993. Its editorial office is based in San Francisco, California, with its business headquarters located in New York City. ''Wired'' quickly became recognized as the voice of the emerging digital economy and culture and a pace setter in print design and web design. From 1998 until 2006, the magazine and its website, ''Wired.com'', experienced separate ownership before being fully consolidated under Condé Nast in 2006. It has won multiple National Magazine Awards and has been credited with shaping discourse around the digital revolution. The magazine also coined the term Crowdsourcing, ''crowdsourcing'', as well as its annual tradition of handing out Vaporware Awards. ''Wired'' has launched several in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science News
''Science News'' (''SN'') is an American monthly magazine devoted to articles about new scientific and technical developments, typically gleaned from recent scientific and technical journals. The periodical has been described as having a scope across "all sciences" and as having "up to date" coverage. History ''Science News'' has been published since 1922 by the Society for Science & the Public, a non-profit organization founded by E. W. Scripps in 1920. American chemist Edwin Slosson served as the publication's first editor. From 1922 to 1966, it was called ''Science News Letter''. The title was changed to ''Science News'' with the March 12, 1966, issue (vol. 89, no. 11). Tom Siegfried was the editor from 2007 to 2012. In 2012, Siegfried stepped down, and Eva Emerson became the Editor in Chief of the magazine. In 2017, Eva Emerson stepped down to become the editor of a new digital magazine, ''Annual Reviews''. On February 1, 2018, Nancy Shute became the Editor in Chief of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientific American
''Scientific American'', informally abbreviated ''SciAm'' or sometimes ''SA'', is an American popular science magazine. Many scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it, with more than 150 Nobel Prize-winners being featured since its inception. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter (painter), Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large-format New York City newspaper was released on August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the United States Patent and Trademark Office, U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 devi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Controllability
Controllability is an important property of a control system and plays a crucial role in many regulation problems, such as the stabilization of unstable systems using feedback, tracking problems, obtaining optimal control strategies, or, simply prescribing an input that has a desired effect on the state. Controllability and observability are dual notions. Controllability pertains to regulating the state by a choice of a suitable input, while observability pertains to being able to know the state by observing the output (assuming that the input is also being observed). Broadly speaking, the concept of controllability relates to the ability to steer a system around in its configuration space using only certain admissible manipulations. The exact definition varies depending on the framework or the type of models dealt with. The following are examples of variants of notions of controllability that have been introduced in the systems and control literature: * State controllability ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Journal Of Physics
The ''American Journal of Physics'' is a monthly, peer-reviewed scientific journal published by the American Association of Physics Teachers and the American Institute of Physics. The editor-in-chief is Beth Parks of Colgate University."Current Frequency: Monthly, 2002; and Former Frequency varies, 1940-2001" Confirmation of Editor, ISSN, CODEN, and other relevant information. Aims and scope The focus of this journal is undergraduate and graduate level physics. The intended audience is college and university physics teachers and students. Coverage includes current research in physics, instructional laboratory equipment, laboratory demonstrations, teaching methodologies, lists of resources, and book reviews. In addition, historical, philosophical and cultural aspects of physics are also covered. According to the 2021 Journal Citation Reports from Clarivate, this journal has a 2020 impact factor of 1.022. History The former title of this journal was ''American Physics Teach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physics Today
''Physics Today'' is the membership magazine of the American Institute of Physics. First published in May 1948, it is issued on a monthly schedule, and is provided to the members of ten physics societies, including the American Physical Society. It is also available to non-members as a paid annual subscription. The magazine informs readers about important developments in overview articles written by experts, shorter review articles written internally by staff, and also discusses issues and events of importance to the science community in politics, education, and other fields. The magazine provides a historical resource of events associated with physics. For example it discussed debunking the physics of the Star Wars program of the 1980s, and the state of physics in China and the Soviet Union during the 1950s and 1970s. According to the ''Journal Citation Reports'', the journal has a 2017 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic jou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
