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The uneven bars or asymmetric bars is an artistic gymnastics apparatus. It is made of a steel frame. The bars are made of fiberglass with wood coating, or less commonly wood. [1] The English abbreviation for the event in gymnastics scoring is UB or AB, and the apparatus and event are often referred to simply as "bars".
The BARS technology was invented around 1989–1991 by the scientists from the Institute of Geology and Geophysics of the Siberian Branch of the Academy of Sciences of the USSR. [2] In the center of the device, there is a ceramic cylindrical reaction cell of about 2 cm 3 in size. The cell is placed into a cubic-shaped pressure-transmitting ...
Perkin triangle. A Perkin triangle is a specialized apparatus for the distillation of air-sensitive materials. It is named after William Henry Perkin Jr., whose design was approximately triangular. [citation needed] The diagram shows a more modern version, in which the glass taps have been replaced with more air-tight Teflon taps.
The Hopkinson pressure bar was first suggested by Bertram Hopkinson in 1914 [1] as a way to measure stress pulse propagation in a metal bar. Later, in 1949 Herbert Kolsky [2] refined Hopkinson's technique by using two Hopkinson bars in series, now known as the split-Hopkinson bar, to measure stress and strain, incorporating advancements in the cathode ray oscilloscope in conjunction with ...
The bars have been moved increasingly further apart, allowing gymnasts to perform swinging, circling, transitional, and release moves that may pass over, under, and between the two bars. At the elite level, movements must pass through the handstand. Gymnasts often mount the uneven bars using a springboard or a small mat.
Skill on the uneven bars, parallel bars or high bar in which the gymnast lets go of the apparatus, performs a skill in the air, and regrasps the bar. Ribbon A gymnastics apparatus used in rhythmic gymnastics. The ribbon is a long piece of material attached to a stick. Rings See still rings. Roundoff
A replica of an apparatus used by Geiger and Marsden to measure alpha particle scattering in a 1913 experiment. The Rutherford scattering experiments were a landmark series of experiments by which scientists learned that every atom has a nucleus where all of its positive charge and most of its mass is concentrated.
The Schlenk line (also vacuum gas manifold) is a commonly used chemistry apparatus developed by Wilhelm Schlenk. [1] It consists of a dual manifold with several ports. [2] One manifold is connected to a source of purified inert gas, while the other is connected to a vacuum pump. The inert-gas line is vented through an oil bubbler, while solvent ...