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  2. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. [1]

  3. Acoustic dispersion - Wikipedia

    en.wikipedia.org/wiki/Acoustic_dispersion

    A widely used technique for determining acoustic dispersion is a broadband transmission method. This technique was originally introduced in 1978 and has been employed to study the dispersion properties of metal (1978), epoxy resin (1986), paper materials (1993), and ultra-sound contrast agent (1998).

  4. Thunder sheet - Wikipedia

    en.wikipedia.org/wiki/Thunder_sheet

    A thunder sheet is a thin sheet of metal used to produce sound effects for musical or dramatic events. The device may be shaken, causing it to vibrate, or struck with a mallet. It is also known as a thunder machine, though this can also refer to a large drum used for a similar sound effect. [2]

  5. Ultrasonic welding - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_welding

    In metals, welding occurs due to high-pressure dispersion of surface oxides and local motion of the materials. Although there is heating, it is not enough to melt the base materials. [clarification needed] Ultrasonic welding can be used for both hard and soft plastics, such as semicrystalline plastics, and metals. The understanding of ...

  6. Iron and steel industry in the United States - Wikipedia

    en.wikipedia.org/wiki/Iron_and_steel_industry_in...

    Graph of US iron and steel production, 1900–2014, data from USGS. The US iron and steel industry has paralleled the industry in other countries in technological developments. In the 1800s, the US switched from charcoal to coke in ore smelting, adopted the Bessemer process, and saw the rise of very large integrated steel mills.

  7. Resonator guitar - Wikipedia

    en.wikipedia.org/wiki/Resonator_guitar

    A resonator guitar or resophonic guitar (often generically called a "Dobro" [1]) is an acoustic guitar that produces sound by conducting string vibrations through the bridge to one or more spun metal cones , instead of to the guitar's sounding board (top). Resonator guitars were originally designed to be louder than regular acoustic guitars ...

  8. Steelmaking - Wikipedia

    en.wikipedia.org/wiki/Steelmaking

    This process greatly improved the quantity and quality of steel production. It added three hours firing time and required large quantities of coke. In making crucible steel, the blister steel bars were broken into pieces and melted in small crucibles, each containing 20 kg or so. This produced higher quality metal, but increased the cost.

  9. Sound baffle - Wikipedia

    en.wikipedia.org/wiki/Sound_baffle

    A sound baffle is a construction or device which reduces the strength (level) of airborne sound. Sound baffles are a fundamental tool of noise mitigation, the practice of minimizing noise pollution or reverberation. An important type of sound baffle is the noise barrier constructed along highways to