Page 109 - Electrical Engineering Dictionary

and test response analyzer (e.g., signature an- buried via a via connected to neither the
alyzer). primary side nor the secondary side of a mul-
tilayer packaging and interconnecting struc-
bulb generator a free-standing genera- ture, i.e., it connects only internal layers.
tor contained in a streamlined, waterproof
bulb-shaped enclosure and driven by a water- burndown breakage of an overhead elec-
wheel resembling a ship’s propeller on a shaft tric power line due to heating from excess
which extends from one end of the enclosure. current.
They are used in tidal power installations.
burnup a measure (e.g., megawattt-days
/ ton) of the amount of energy extracted from
bulk power a term inclusive of the gener- each unit of fissile material invested in a nu-
ation and transmission portions of the power clear reactor.
system.
burn-in component testing where infant
mortality failures (defective or weak parts)
bulk scattering scattering at the volume
are screened out by testing at elevated volt-
ofaninhomogeneousmedium, generallyalso
ages and temperatures for a specified length
possessing rough boundaries. It is due to in-
of time.
homogeneities in the refractive index.
burst refresh in DRAM, carrying out
bulk substation a substation located on
all required refresh actions in one continu-
a high-voltage transmission line which sup-
ous sequence—a burst. See also distributed
plies bulk power to a non-generating utility.
refresh.
bulldog an attachment for a wire or hoist.
burst transfer the sending of multi-
ple related transmissions across an intercon-
bump a localized orbit displacement cre- nect, with only one initialization sequence
ated by vertical or horizontal correction el- that takes place at the beginning of the burst.
ement dipoles used to steer beam through
available aperture or around obstacles. burstiness factor used in traffic descrip-
tion, the ratio of the peak bit rate to the aver-
bunch a group of particles captured in a age bit rate.
phase space bucket.
bus (1) a data path connecting the dif-
bundle the practice of paralleling several ferent subsystems or modules within a com-
conductors per phase in an overhead trans- puter system. A computer system will usu-
missionlineforthepurposeofincreasingam- ally have more than one bus; each bus will
pacity and decreasing inductive reactance. be customized to fit the data transfer needs
between the modules that it connects.
bundle spacer a rigid structure which is (2) a conducting system or supply point,
used to maintain the spacing of wires in a usually of large capacity. May be composed
bundled conductor on an overhead electric of one or more conductors, which may be
power transmission line See bundle. wires, cables, or metal bars (busbars).
(3) a node in a power system problem
bundled services utility services which (4) a heavy conductor, typically used with
are sold together, like power transmission generating and substation equipment.
and distribution services in non-deregulated
electric utilities. bus admittance matrix See Y-bus.

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2000 by CRC Press LLC