VFT (floorball)
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VFT (floorball)
VFT, an abbreviation, may refer to: *Variable frequency transformer, a type of electricity transformer * Venus Flytrap, a variety of carnivorous plant * Vertical fire-tube boiler, a heat-transfer device used in steam engines * Very Fast Train, a proposed high-speed railway in Australia *Virtual field trip A virtual field trip is a guided exploration through the World Wide Web that organizes a collection of pre-screened, thematically based web pages into a structured online learning experience. (Foley, 2003). Since 2007, another dynamic and interactiv ..., a method used in online education * Virtual function table, a mechanism used in programming language * Vogel–Fulcher–Tammann equation, an equation used to describe the viscosity of liquids as a function of temperature {{disambig ...
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Variable Frequency Transformer
A variable-frequency transformer (VFT) is used to transmit electricity between two ( asynchronous or synchronous) alternating current frequency domains. The VFT is a relatively recent development. Most asynchronous grid inter-ties use high-voltage direct current converters, while synchronous grid inter-ties are connected by lines and "ordinary" transformers, but without the ability to control power flow between the systems. It can be thought of as a very high power synchro, or a rotary converter acting as a frequency changer, which is more efficient than a motor–generator of the same rating. Construction and operation A variable-frequency transformer is a doubly fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external power circuit. The stator is connected to the other. With no applied torque, the shaft rotates due to the difference in frequency between the networks connected to the rot ...
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Venus Flytrap
The Venus flytrap (''Dionaea muscipula'') is a carnivorous plant native to subtropical wetlands on the East Coast of the United States in North Carolina and South Carolina. It catches its prey—chiefly insects and arachnids—with a trapping structure formed by the terminal portion of each of the plant's leaves, which is triggered by tiny hairs (called "trigger hairs" or "sensitive hairs") on their inner surfaces. When an insect or spider crawling along the leaves contacts a hair, the trap prepares to close, snapping shut only if another contact occurs within approximately twenty seconds of the first strike. Triggers may occur with a tenth of a second of contact. The requirement of redundant triggering in this mechanism serves as a safeguard against wasting energy by trapping objects with no nutritional value, and the plant will only begin digestion after five more stimuli to ensure it has caught a live bug worthy of consumption. ''Dionaea'' is a monotypic genus closely relat ...
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Vertical Fire-tube Boiler
A vertical fire-tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire-tubes, arranged vertically. These boilers were not common, owing to drawbacks with excessive wear in service. The more common form of vertical boiler, which was very similar in external appearance, instead used a single flue and water-filled cross-tubes. Another form used horizontal fire-tubes, even where this added complexity, such as the Cochran boiler. Where a sustained high evaporative capacity (i.e. power) was required, vertical tubes were used, but rarely. These cases were mostly for locomotives, either railway locomotives or road steam wagons. Drawbacks In any boiler, one of the most prone locations for tube and plate wastage is around the water level, where agitation and boiling is most active. This is particularly so when this level is also part of the heated surface, where boiling is most intense (water-tube boiler designs a ...
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Very Fast Train
High-speed rail in Australia has been under investigation since the early 1980s. Every Federal Government since this time has investigated the feasibility of constructing high-speed rail with speeds above 200 km/h, but to date nothing has ever gone beyond the detailed planning stage. The most commonly suggested route is between Australia's two largest cities, Sydney and Melbourne, which is the world's second- or third-List of busiest passenger air routes, busiest air corridor. Corridor selection history for Australian high-speed rail, Various corridors have been proposed for a potential high-speed line. The distance between them is around 800 km (500 miles), which requires very high speeds to make trains competitive with air travel. The Australian rail speed record of 210 km/h was set by Queensland Rail's Electric Tilt Train during a trial run in 1998. This speed is just above the internationally accepted definition of high-speed rail of . The Transwa WDA/WDB/WDC ...
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Virtual Field Trip
A virtual field trip is a guided exploration through the World Wide Web that organizes a collection of pre-screened, thematically based web pages into a structured online learning experience. (Foley, 2003). Since 2007, another dynamic and interactive form of a virtual field trip has been – and is – freely available. The first was the Pilbara VFT (pilbara.mq.edu.au) with a much more extensive and up-to-date suite of astrobiology-related VFTs at vft.asu.edu. The non-interactive forms of VFT are an inter-related collection of images, supporting text and/or other media, delivered electronically via the World Wide Web, in a format that can be professionally presented to relate the essence of a visit to a time or place. The virtual experience becomes a unique part of the participants' life experience. (Nix, 1999) Virtual field trips (VFTs) started appearing around 1995(LEARNZ) but greatly grew in popularity starting around 2000. The VFT was seen as a way to organize the educational po ...
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Virtual Method Table
In computer programming, a virtual method table (VMT), virtual function table, virtual call table, dispatch table, vtable, or vftable is a mechanism used in a programming language to support dynamic dispatch (or run-time method binding). Whenever a class defines a virtual function (or method), most compilers add a hidden member variable to the class that points to an array of pointers to (virtual) functions called the virtual method table. These pointers are used at runtime to invoke the appropriate function implementations, because at compile time it may not yet be known if the base function is to be called or a derived one implemented by a class that inherits from the base class. There are many different ways to implement such dynamic dispatch, but use of virtual method tables is especially common among C++ and related languages (such as D and C#). Languages that separate the programmatic interface of objects from the implementation, like Visual Basic and Delphi, also te ...
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