“injection”的概念、定义、翻译、参考文献-科学参考

　

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, $f : X \to Y$ is an injection if $f (x_{1}) = f (x_{2}) implies x_{1} = x_{2}$ 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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