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Voith-Schneider Propellers
A cyclorotor, cycloidal rotor, cycloidal propeller or cyclogiro, is a fluid propulsion device that converts shaft power into the acceleration of a fluid using a rotating axis perpendicular to the direction of fluid motion. It uses several blades with a spanwise axis parallel to the axis of rotation and perpendicular to the direction of fluid motion. These blades are cyclically pitched twice per revolution to produce force (thrust or lift) in any direction normal to the axis of rotation. Cyclorotors are used for propulsion, lift, and control on air and water vehicles. An aircraft using cyclorotors as the primary source of lift, propulsion, and control is known as a cyclogyro or cyclocopter. A unique aspect is that it can change the magnitude and direction of thrust without the need of tilting any aircraft structures. The patented application, used on ships with particular actuation mechanisms both mechanical or hydraulic, is named after German company Voith Turbo. Operating princip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jet Engine
A jet engine is a type of reaction engine discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion. While this broad definition can include rocket, Pump-jet, water jet, and hybrid propulsion, the term typically refers to an internal combustion airbreathing jet engine such as a turbojet, turbofan, ramjet, or pulse jet engine, pulse jet. In general, jet engines are internal combustion engines. Airbreathing jet engines typically feature a Axial compressor, rotating air compressor powered by a turbine, with the leftover power providing thrust through the propelling nozzle—this process is known as the Brayton cycle, Brayton thermodynamic cycle. Jet aircraft use such engines for long-distance travel. Early jet aircraft used turbojet engines that were relatively inefficient for subsonic flight. Most modern subsonic jet aircraft use more complex High-bypass turbofan, high-bypass turbofan engines. They give higher speed and greater fuel eff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WIT Press
The Wessex Institute of Technology (usually referred to as just Wessex Institute or WIT) is an educational and research institute. WIT is located at Ashurst Lodge in the New Forest National Park, in the South of England. established the Wessex Institute of Technology in 1986 which succeeded the Computational Mechanics Institute formed in 1981. He held the role of Chairman until his death on Saturday 3 March 2018. The Wessex Institute’s activities are divided into 3 core areas: Research, Conferences and Publishing. Research The Wessex Institute of Technology research programmes are funded by industry and research organisations. International conference programme The Wessex Institute of Technology organises a programme of around 15 to 20 conferences each year. Publishing - WIT Press WIT Press is the publishing service of the Wessex Institute of Technology. Based at Ashurst Lodge, it publishes conference proceedings, journals and a number of specialised research mono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Experimental Biology
''Journal of Experimental Biology'' (formerly ''The British Journal of Experimental Biology)'' is a peer-reviewed scientific journal in the field of comparative physiology and integrative biology. It is published by The Company of Biologists. The journal is partnered with Publons and has two-way integration with bioRxiv. ''Journal of Experimental Biology'' is now a hybrid journal and publishes 24 issues a year. Content over six months old is free to read. History ''The'' ''British Journal of Experimental Biology'' was established in Edinburgh in 1923 (''Br. J. Exp. Biol.'': ). It was published by Oliver and Boyd and edited by F. A. E. Crew with an Editorial Board of nine members, including Julian Huxley. When the journal ran into financial trouble, George Parker Bidder II, the founder of The Company of Biologists, rescued it in 1925. Sir James Gray was appointed as the journal's first Editor-in-Chief in 1925 and the journal was renamed ''The Journal of Experimental Biology' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sharkskin
Sharkskin is a generic term used to describe a woven or warp-knitted fabric that imitates a shark's skin. The lines run from lower left to upper right on the face of the fabric . Sharkskin fabric in woven category varies with plain, basket and twill weave formations, It is typically made with acetate and rayon yarns, as well as with worsted wool and various synthetic blends. The combination of color of the yarns and twill weaving pattern in which the colored threads run diagonal to the white yarns, results in the finish for which sharkskin fabric is known. It has smooth but crisp texture and two tone lustrous appearance. Lightweight and wrinkle-free, sharkskin is ideal for curtains, tablecloths and napkins. Sharkskin fabric is popular for both men’s and women’s worsted suits, light winter jackets and coats. Sharkskin is commonly used as a liner in diving suits and wetsuits. Composition Sharkskin has historically been made with different types of natural fibers, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolutionary Ecology (journal)
''Evolutionary Ecology'' is a bimonthly peer-reviewed scientific journal covering the study of ecology from an evolutionary perspective. It was established in 1987 and is published by Springer Science+Business Media. The editor-in-chief is Matthew Symonds (Deakin University). 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 journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 2.133. References External links * {{Ecology-journal-stub Evolutionary ecology Evolutionary biology journals Ecology journals Springer Science+Business Media academic journals Bimonthly journals Publications established in 1987 English-language journals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Avian Biology
The ''Journal of Avian Biology'' is a monthly peer-reviewed scientific journal of ornithology published by Wiley-Blackwell on behalf of the Nordic Society Oikos. The editors-in-chief are Thomas Alerstam and Jan-Åke Nilsson. The journal was established in 1970 as ''Ornis Scandinavica'' and appeared quarterly. It obtained its current name in 1994, changed to bimonthly publication in 2004 and continuous monthly publication in 2018. According to the ''Journal Citation Reports'', the journal has a 2017 impact factor of 2.488, ranking it second out of 25 journals in the category "Ornithology". See also * List of ornithology journals The following is a list of journals and magazines relating to birding and ornithology. The continent and country columns give the location where the journal or magazine is published and may not correspond with its scope or content. See also ... References External links * Journals and magazines relating to birding and ornithology Wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unsteady Lift
Unsteady may refer to: *Unsteady flow In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and gases. It has several subdisciplines, including ''aerodynamics'' (the study of air and other gases in motion) and ..., a condition of fluid mechanics that changes with time * "Unsteady" (song), X Ambassadors 2015 song See also * Steady (other) * Unstable (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbulence
In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers. Turbulence is commonly observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney, and most fluid flows occurring in nature or created in engineering applications are turbulent. Turbulence is caused by excessive kinetic energy in parts of a fluid flow, which overcomes the damping effect of the fluid's viscosity. For this reason turbulence is commonly realized in low viscosity fluids. In general terms, in turbulent flow, unsteady vortices appear of many sizes which interact with each other, consequently drag due to friction effects increases. This increases the energy needed to pump fluid through a pipe. The onset of turbulence can be predicted by the dimensionless Rey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reynolds Number
In fluid mechanics, the Reynolds number () is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers flows tend to be turbulent. The turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow ( eddy currents). These eddy currents begin to churn the flow, using up energy in the process, which for liquids increases the chances of cavitation. The Reynolds number has wide applications, ranging from liquid flow in a pipe to the passage of air over an aircraft wing. It is used to predict the transition from laminar to turbulent flow and is used in the scaling of similar but different-sized flow situations, such as between an aircraft model in a wind tunnel and the full-size ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advance Ratio
In aeronautics and marine hydrodynamics, the ''advance ratio'' is the ratio of the freestream fluid speed to the propeller, rotor, or cyclorotor tip speed. When a propeller-driven vehicle is moving at high speed relative to the fluid, or the propeller is rotating slowly, the advance ratio of its propeller(s) is a high number; and when it is moving at low speed, or the propeller is rotating at high speed, the advance ratio is a low number. The advance ratio is a useful non-dimensional velocity in helicopter and propeller theory, since propellers and rotors will experience the same angle of attack on every blade airfoil section at the same advance ratio regardless of actual forward speed. It is the inverse of the tip speed ratio used for wind turbines. Mathematical definition Propellers The advance ratio J is a non-dimensional term given by: :J = \frac, where : Helicopter rotors and cyclorotors The advance ratio μ is defined as: : \mu = \frac, where : Significance He ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
College Park, MD
College Park is a city in Prince George's County, Maryland, United States, and is approximately four miles (6.4 km) from the northeast border of Washington, D.C. The population was 34,740 at the 2020 United States Census. It is best known as the home of the University of Maryland, College Park. Since 1994, the city has also been home to the National Archives at College Park, a facility of the U.S. National Archives, as well as to the National Oceanic and Atmospheric Administration (NOAA) Center for Weather and Climate Prediction (NCWCP) and the Food and Drug Administration (FDA) Center for Food Safety and Applied Nutrition (CFSAN). History Development College Park was developed beginning in 1889 near the Maryland Agricultural College (later the University of Maryland) and the College Station stop of the Baltimore and Ohio Railroad. The suburb was incorporated in 1945 and included the subdivisions of College Park, Lakeland, Berwyn, Oak Spring, Branchville, Daniel's Park, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
