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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 gyroscopic effects or positive trail to be 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 rear frame and one attached to the front fork. Instead of rotating wheels, the non-holonomic ground contacts are provided by small-radius skates. History The self-stability of bicycles was reported as early as 1876. Emmanuel Carvallo in 1897 and Francis Whipple in 1899 both developed equations of motion for a bicycle that showed this self-stability. In 197 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emmanuel Carvallo
Emmanuel Carvallo was a French mathematician. He is notable for showing in 1897 that bicycles could be self-stable, for opposing wave models of X-rays in 1900, and for claiming in 1912 that Einstein's Theory of Relativity The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in ... 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 400 public radio stations. ''SciFri'' is hosted by award-winning science journalist Ira Flatow and was created 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 ... [...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. 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 journal, part engineering text." Unlike most magazines, ''Bicycle Quarterly'' is financed by subscriptions, and includes only few advertisements. In Vol. 5, No. 1, ''Bicycle Quarterly'' published an article which dealt with the results of rolling resistance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dave Moulton
Edward David Moulton (born 8 February 1936 in Surrey, England) is a retired custom bicycle frame builder. 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, Worcester, England. In 1976, Paul Carbutt rode one of Moulton's bicycles in the 1976 Summer Olympics, Olympics in Montreal, 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. Moulton emigrated to the United States in 1979 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 Bicyc ... [...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 and 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 * Cold-weather biking * Icetrack cycling *Two-mass-skate bicycle *Skibob Skibobbing (also called skibiking or snowbiking) is a winter sport involving a bicycle-type frame attached to skis instead of wheels and sometimes a set of foot skis. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wired (magazine)
''Wired'' (stylized as ''WIRED'') is a monthly American magazine, published in print and online editions, that focuses on how emerging technologies affect culture, the economy, and politics. Owned by Condé Nast, it is headquartered in San Francisco, California, and has been in publication since March/April 1993. Several spin-offs have been launched, including '' Wired UK'', ''Wired Italia'', ''Wired Japan'', and ''Wired Germany''. From its beginning, the strongest influence on the magazine's editorial outlook came from founding editor and publisher Louis Rossetto. With founding creative director John Plunkett, Rossetto in 1991 assembled a 12-page prototype, nearly all of whose ideas were realized in the magazine's first several issues. In its earliest colophons, ''Wired'' credited Canadian media theorist Marshall McLuhan as its "patron saint". ''Wired'' went on to chronicle the evolution of digital technology and its impact on society. ''Wired'' quickly became recognized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science News
''Science News (SN)'' is an American bi-weekly magazine devoted to articles about new scientific and technical developments, typically gleaned from recent scientific and technical journals. History ''Science News'' has been published since 1922 by 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 the magazine. In April 2008, the magazine changed from a weekly format to the current biweekly format, and the website w ... [...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 famous scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which in turn is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large format newspaper was released August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 device for buoying vessels by Abraham Lincoln, and the universal joint which now can be found in nearly every automobile manufactured. Current issues includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Controllability
Controllability is an important property of a control system, and the controllability property plays a crucial role in many control problems, such as stabilization of unstable systems by feedback, or optimal control. Controllability and observability are dual aspects of the same problem. Roughly, the concept of controllability denotes the ability to move a system around in its entire configuration space using only certain admissible manipulations. The exact definition varies slightly within the framework or the type of models applied. The following are examples of variations of controllability notions which have been introduced in the systems and control literature: * State controllability * Output controllability * Controllability in the behavioural framework State controllability The state of a deterministic system, which is the set of values of all the system's state variables (those variables characterized by dynamic equations), completely describes the system at any giv ... [...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 Teache ... [...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 jour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
