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Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
Quantum field theory, the framework in which all of modern particle physics is described, is usually described as a theory of quantized fields. However, although not widely appreciated, it has been known since Feynman [ 2 ] that many quantum field theories may equivalently be described in terms of world lines.
In physics, physical chemistry 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 hydrodynamics (the study of water and other liquids in motion).
Drawing of Geissler tubes illuminated by their own light, from 1868 French physics book, showing some of the many decorative shapes and colors Modern recreation of a Geissler tube in a museum A Geissler tube is a precursor to modern gas discharge tubes , demonstrating the principles of electrical glow discharge , akin to contemporary neon ...
A tube, or tubing, is a long hollow cylinder used for moving fluids (liquids or gases) or to protect electrical or optical cables and wires. The terms " pipe " and "tube" are almost interchangeable, although minor distinctions exist — generally, a tube has tighter engineering requirements than a pipe.
The suspect in the New Orleans attack that killed 14 people on New Year's Day is believed to have acted alone in a "premeditated and evil act," the FBI has said. The latest information is counter ...
Prevention and screening beat out treatment advances in terms of preventing deaths for cervical, colorectal, lung and prostate cancers. Breast cancer was the only type for which treatment advances ...
Sydney Sweeney is living her best life in Florida (where she owns a $13.5 million mansion on the water), and just dropped a picture of herself lounging on a jet ski.