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Military instruments as a class draw on most of the categories of instrument described throughout this article, such as navigation, astronomy, optics, and imaging, and the kinetics of moving objects. Common abstract themes that unite military instruments are seeing into the distance, seeing in the dark, knowing an object's geographic location ...
Lasers are usually labeled with a safety class number, which identifies how dangerous the laser is: Class 1 is inherently safe, usually because the light is contained in an enclosure, for example in CD players; Class 2 is safe during normal use; the blink reflex of the eye will prevent damage. Usually up to 1 mW power, for example, laser pointers.
The median land area used by US nuclear power stations per 1 GW installed capacity is 1.3 square miles (3.4 km 2). [ 356 ] [ 357 ] To generate the same amount of electricity annually (taking into account capacity factors ) from solar PV would require about 60 square miles (160 km 2 ), and from a wind farm about 310 square miles (800 km 2 ).
The rink was based on a concrete surface, with layers of earth, cow hair and timber planks. Atop these were laid oval copper pipes carrying a solution of glycerine with ether, nitrogen peroxide and water. The pipes were covered by water and the solution was pumped through, freezing the water into ice.
At a wavelength of 670 nm (6.7 × 10 −7 m), measured refractive index and extinction coefficient values are 3.135 and 0.897, respectively. Thickness determination yielded 3.7 Å across a 0.5mm area, consistent with the 3.35 Å reported for layer-to-layer carbon atom distance of graphite crystals. [113]
The first area is Wernicke's area, which is in the posterior section of the superior temporal gyrus in the dominant cerebral hemisphere. People with a lesion in this area of the brain develop receptive aphasia , a condition in which there is a major impairment of language comprehension, while speech retains a natural-sounding rhythm and a ...
Finland has about 168,000 lakes (of area larger than 500 m 2 or 0.12 acres) and 179,000 islands. [107] Its largest lake, Saimaa, is the fourth largest in Europe. The Finnish Lakeland is the area with the most lakes in the country; [13] many of the major cities in the area, most notably Tampere, Jyväskylä and Kuopio, are
In finance, an option is a contract which conveys to its owner, the holder, the right, but not the obligation, to buy or sell a specific quantity of an underlying asset or instrument at a specified strike price on or before a specified date, depending on the style of the option.