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Corundum

Corundum Definition Corundum is an extremely hard mineral occurring in many colors, either as shapeless grains or as rhombohedral crystals. It also occurs in gem varieties such as ruby and sapphire and in a dark-colored variety that is used for polishing and scraping. Corundum is found in igneous.....

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Amygdala

Amygdala Definition Amygdala is an almond-shaped mass of gray matter in the front part of the temporal lobe of the cerebrum that is part of the limbic system and is involved in the processing and expression of emotions, especially anger and fear. The amygdala is an important part of the brain, wh.....

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Chromium

Chromium Definition Chromium is a hard, shiny, steel-gray metallic element that is rust-resistant and does not tarnish easily. It is used to plate other metals, to harden steel, and to make stainless steel and other alloys. Atomic number 24; atomic weight 51.996; melting point 1,890°C; boiling p.....

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Reviews about Acer Predator 21 X

Reviews about Acer Predator 21 X Introduction Acer has made the most of the enormous size of the 21 X, cramming what feels like every inch of it with some serious firepower. Like the external design, the 21 X’s spec sheet feels built for sheer overkill. The curved screen is the single-bigge.....

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Cerebrum

Cerebrum Definition Cerebrum is the largest part of the vertebrate brain, filling most of the skull and consisting of two cerebral hemispheres divided by a deep groove and joined by the corpus callosum, a transverse band of nerve fibers. It is the seat of reason, planning, memory, and sensory int.....

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Pulsar

Pulsar Definition Pulsar is A rapidly spinning neutron star that emits radiation, usually radio waves, in narrow beams focused by the star’s powerful magnetic field and streaming outward from its magnetic poles. Pulsars are spherical, compact objects that are about the size of a large city .....

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Ruby Gemstone

Ruby Gemstone Definition Ruby is a stone of nobility, considered the most magnificent of all gems, the queen of stones and the stone of kings. It is a pink to blood-red colored gemstone. The color of Ruby is the result of the presence of chromium into the crystal lattice of alumina (Al2O3) corund.....

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Convex Polygon: Definition and Properties

Convex polygon is a polygon that has all interior angles less than 180°. Convex polygons are polygons for which a line segment joining any two points in the interior lies completely within the figure. This means that all the vertices of the polygon will point outwards, away from the interior of .....

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About Sapphire

About Sapphire Definition Sapphire is a clear, fairly pure form of the mineral corundum that is usually blue but may be any color except red. It often contains small amounts of oxides of cobalt, chromium, and titanium and is valued as a gem. The only color which sapphire cannot be is red – as r.....

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Radio Telescope

Radio Telescope Definition Radio Telescope is an instrument that consists of a radio receiver and antenna system mounted on a wide, bowl-shaped reflector, used to detect radio-frequency emissions from astronomical objects. It is an astronomical instrument consisting of a radio receiver and an ant.....

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Limbic System

Limbic System Definition Limbic System is a group of interconnected structures of the brain including the hypothalamus, amydala, and hippocampus that are located beneath the cortex, are common to all mammals, and are associated with emotions such as fear and pleasure, memory, motivation, and vari.....

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About Radio Frequency

About Radio Frequency Definition Radio Frequency (RF) is a frequency or band of frequencies that lie in the range 10 kilohertz to 300 000 megahertz and can be used for radio communications and broadcasting. It is a measurement representing the oscillation rate of electromagnetic radiation spectru.....

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