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单词 injection
释义
injection
Mathematics

  • A synonym for one‐to‐one mapping.

Space Exploration

  • Placing a spacecraft into a particular trajectory. The proper injection often requires manoeuvres after the launch. For example, a space probe to Mars needs a trajectory correction manoeuvre (TCM) about 15 days into the journey. The term is also sometimes used, instead of ‘insertion’, for placing a space vehicle into an orbit.

Computer

  • A function with the property that distinct elements in its domain are mapped onto distinct elements in the codomain. Formally,

    f:X→Y
    is an injection if
    f(x1)=f(x2)impliesx1=x2
    A common use of injections is to map or include elements of some smaller set, such as the set of integers, into a larger set, such as the set of real numbers.

Electronics and Electrical Engineering

  • 1. In general, the application of a signal to an electronic circuit or device.

    2. The introduction of excess charge carriers, either electrons or holes, into a semiconductor material so that the total number present exceeds that at thermal equilibrium. In low-level injection the number of excess carriers is small whereas in high-level injection the number of excess carriers is comparable to the numbers at thermal equilibrium.
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