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Core(kō`rē), variant of KorahKorah
, in the Bible. 1 Levite leader, with Dathan and Abiram, of the unsuccessful revolt in the desert against the exclusive priesthood of the Aaronic family and against the leadership of Moses; the rebels were consumed by fire and earthquake.
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a cylindrical column of rock drilled out as a result of annular breaking of the face of a borehole. The crushed rock is brought to the surface through the annulus outside or inside the pipe by mud or compressed air or gas injected into the borehole by a mud pump or compressor, and the core enters a core barrel. Every 0.5–6.0 m, the core is wedged, separated from the bottom, and raised to the surface with the coring tool. The core is conveyed to the surface almost continuously in the internal cavity of the pipe string; thus, the depth from which a sample comes may be determined. A macroscopic description of the core is made according to its external appearance. Later, the core is cut lengthwise into two parts, each of which undergoes chemical, geologic, and petrographic analysis and is studied to determine the physiomechanical properties of the rock. The remaining part of the core is preserved as a basic geologic document. The core yield is defined as a percentage of the drilled length in meters. A 100 percent core yield makes possible the completely reliable study of the rocks intersected by a borehole and the determination of the reserves of a mineral.
(archaeology), a piece of flint or other rock from which chips or blades were struck off or removed by the application of pressure and used to fashion stone implements. The core always had a striking platform, that is, the flat surface remaining after the initial piece of stone was broken off; it also had depressions or grooves resulting from the chipping off of flakes and prying off of blades and radiating at an angle to the striking platform. Disk-shaped or tortoise-shaped cores are typical of the Paleolithic Mousterian culture. Pyramidal, pencil-shaped, and prismatic cores existed during the Upper Paleolithic, Mesolithic, Neolithic, and Aeneolithic.
Some derived idioms are quite current; "in core", for example, means "in memory" (paged in, as opposed to "on disk", paged out), and both core dump and the "core image" or "core file" produced by one are terms in favour. Some varieties of Commonwealth hackish prefer store.
core(1) The heart, or central part, of something. The core of a network is its backbone. A core program would be the primary routines that serve the entire application (see kernel).
(2) In digital electronics, it typically refers to a relatively large, general-purpose logic function that is used as a building block in a chip design. Examples are microprocessor, microcontroller and DSP cores. Cores may be developed internally, but are generally purchased from third-party intellectual property (IP) vendors. See soft core and hard core.
(3) A CPU. A microprocessor with two cores (dual cores) is a single chip that contains two processors. See dual core and multicore.
(4) (Core) A family of CPU chips from Intel. Introduced in 2006, the Core line was developed to supersede the Pentium brand. See Intel Core.
(5) A round magnetic doughnut that represents one bit in an earlier core storage system. When core storage was common in the 1960s, a computer's main memory used to be called "core." See core storage.