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  2. Time-invariant system - Wikipedia

    en.wikipedia.org/wiki/Time-invariant_system

    In control theory, a time-invariant ( TI) system has a time-dependent system function that is not a direct function of time. Such systems are regarded as a class of systems in the field of system analysis. The time-dependent system function is a function of the time-dependent input function. If this function depends only indirectly on the time ...

  3. Emergency Alert System - Wikipedia

    en.wikipedia.org/wiki/Emergency_Alert_System

    The National Public Warning System, also known as the Primary Entry Point (PEP) stations, is a network of 77 radio stations that are, in coordination with FEMA, used to originate emergency alert and warning information to the public before, during, and after incidents and disasters. PEP stations are equipped with additional and backup ...

  4. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time ), metre (m, length ), kilogram (kg, mass ), ampere (A, electric current ), kelvin (K, thermodynamic temperature ), mole (mol, amount of substance ), and candela (cd, luminous intensity ).

  5. Time-sharing system evolution - Wikipedia

    en.wikipedia.org/wiki/Time-sharing_system_evolution

    Time-sharing. Time-sharing was first proposed in the mid- to late-1950s and first implemented in the early 1960s. The concept was born out of the realization that a single expensive computer could be efficiently utilized by enabling multiprogramming, and, later, by allowing multiple users simultaneous interactive access. [1]

  6. How Long Does Weed (Marijuana) Stay in Your System? - Healthline

    www.healthline.com/health/how-long-does-weed...

    The length of time weed stays in your system varies according to use. Here’s how long it’s detectable in different drug tests using blood, saliva, urine, and hair.

  7. Folksonomy - Wikipedia

    en.wikipedia.org/wiki/Folksonomy

    Folksonomy is a classification system in which end users apply public tags to online items, typically to make those items easier for themselves or others to find later. Over time, this can give rise to a classification system based on those tags and how often they are applied or searched for, in contrast to a taxonomic classification designed by the owners of the content and specified when it ...

  8. Express Entry - Wikipedia

    en.wikipedia.org/wiki/Express_Entry

    Express Entry (French: Entrée express) is a system used by the Canadian government to manage Canadian permanent residence applications for filling labour gaps through certain economic immigration programs. [1] Launched on 1 January 2015, this immigration system is used to select and communicate with skilled and qualified applicants, it also ...

  9. Entropy as an arrow of time - Wikipedia

    en.wikipedia.org/wiki/Entropy_as_an_arrow_of_time

    Entropy is one of the few quantities in the physical sciences that require a particular direction for time, sometimes called an arrow of time. As one goes "forward" in time, the second law of thermodynamics says, the entropy of an isolated system can increase, but not decrease. Thus, entropy measurement is a way of distinguishing the past from ...

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