An inference method, used in automated theorem provers, proof assistants and other artificial intelligence applications, that is working backward from the goals. It starts with a list of goals and works backwards from the consequent to the antecedent to see if there is available data which support them.
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A variation on a Zener diode with better conduction for small reverse biases than for forward bias voltages.
One bit field in a frame relay or asynchronous transfer mode network that signals to anything receiving the frame that congestion is occurring in the opposite direction from the frame.
A method of interlocking the links of a switching chain.
Movement of the brushes of a commutating machine which reduces sparking on the commutator.
Signaling between the called and calling end of a circuit.
A wave with group velocity directed opposite to the stream of electrons in a travelling wave tube.
Type of microwave tube where electromagnetic energy flows in the opposite direction than the electrons in the beam.
Medical condition characterized by the presence of the bacteria in the blood.
A large group of prokaryotic microorganisms. They are cosmopolitan organisms, that live in soil, water, acidic hot springs, radioactive waste, Earth's crust, and other living organism. They have a wide range of shapes (most famous being rod and sphere). They were among the first life forms on Earth.