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2. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A table fan. A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing, or case. [1]

3. Scaffolding - Wikipedia

   en.wikipedia.org/wiki/Scaffolding

   Scaffolding, also called scaffold or staging, [2] is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other human-made structures. Scaffolds are widely used on site to get access to heights and areas that would be otherwise hard to get to. [3]

4. Compiler - Wikipedia

   en.wikipedia.org/wiki/Compiler

   The name "compiler" is primarily used for programs that translate source code from a high-level programming language to a low-level programming language (e.g. assembly language, object code, or machine code) to create an executable program. [1][2]: p1 [3] There are many different types of compilers which produce output in different useful forms ...

5. Draft tube - Wikipedia

   en.wikipedia.org/wiki/Draft_tube

   Draft tube. A draft tube is a diverging tube fitted at the exit of a turbine's runner and used to utilize the kinetic energy available with water at the exit of the runner. [1] This draft tube at the end of the turbine increases the pressure of the exiting fluid at the expense of its velocity. This means that the turbine can reduce pressure to ...

6. Formwork - Wikipedia

   en.wikipedia.org/wiki/Formwork

   Fabric formwork is a small niche in concrete technology. It uses soft, flexible materials as formwork against the fresh concrete, normally with some sort of strong tension textile or plastic material. The International Society of Fabric Forming conducts research on fabric formwork.

7. Cross-flow turbine - Wikipedia

   en.wikipedia.org/wiki/Cross-flow_turbine

   After passing to the inside of the runner, it leaves on the opposite side, going outward. Passing through the runner twice provides additional efficiency. When the water leaves the runner, it also helps clean it of small debris and pollution. The cross-flow turbine is a low-speed machine that is well suited for locations with a low head but ...