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  2. Table of keyboard shortcuts - Wikipedia

    en.wikipedia.org/wiki/Table_of_keyboard_shortcuts

    Show the window in full screen mode, with no border, menubar, toolbar or statusbar Depends on application, system default: ⌘ Cmd+Ctrl+F and Fn+F: Ctrl+⇧ Shift+F: Ctrl+F11: Rollup/down window Win+D Available, but no default: Show all open windows ⊞ Win+Tab ↹: F3 or F9 or Fn+F9 or Move mouse pointer to configured hot corner or active ...

  3. IBM ThinkPad 560 - Wikipedia

    en.wikipedia.org/wiki/IBM_ThinkPad_560

    The IBM ThinkPad 560 is a notebook series from the ThinkPad line by IBM. [ 1 ] [ 2 ] [ 3 ] It has been argued that the ThinkPad 560 was the first ultraportable notebook. [ 4 ]

  4. Crossflow cylinder head - Wikipedia

    en.wikipedia.org/wiki/Crossflow_cylinder_head

    A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.

  5. Central vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Central_vacuum_cleaner

    Motors of both filtered and filterless systems are usually protected by a thermal cutoff switch, which disconnects the power if the motor overheats due to blocked airflow. In addition, the best designs in either system incorporate so-called "bypass cooling", using a completely separate source of ambient air to cool the motor, rather than the ...

  6. Electronic symbol - Wikipedia

    en.wikipedia.org/wiki/Electronic_symbol

    Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...

  7. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    This part dates back to the joint valve code key (German: Röhren-Gemeinschafts schlüssel) negotiated between Philips and Telefunken in 1933–34. Like the North American system the first symbol describes the heater voltage, in this case, a Roman letter rather than a number.

  8. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    KEY: key: Drawing callouts marked "KEY" define "key characteristics" that are considered especially important for fit, function, safety, or other reasons. They are thus subjected to higher inspection sampling levels. KPSI, kpsi: kilopounds per square inch, that is, thousands of pounds per square inch: See discussion at synonym KSI. KSI, ksi

  9. Brushless DC electric motor - Wikipedia

    en.wikipedia.org/wiki/Brushless_DC_electric_motor

    A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows.