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ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size worldwide. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes; the ISO 269 "C" series is commonly listed alongside the A and B sizes.
The millimetre or millimeter is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power.
In guns, particularly firearms, caliber is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bore is measured and whether the finished bore matches that specification. It is measured in inches or in millimeters. In the United States it is expressed in hundredths of an inch; in the United Kingdom in thousandths; and elsewhere in millimeters. For example, a US "45 caliber" firearm has a barrel diameter of roughly 0.45 inches (11 mm). Barrel diameters can also be expressed using metric dimensions. For example, a "9 mm pistol" has a barrel diameter of about 9 millimeters. Since metric and US customary units do not convert evenly at this scale, metric conversions of caliber measured in decimal inches are typically approximations of the precise specifications in non-metric units, and vice versa.
In geology, hotspots are volcanic locales thought to be fed by underlying mantle that is anomalously hot compared with the surrounding mantle. Examples include the Hawaii, Iceland, and Yellowstone hotspots. A hotspot's position on the Earth's surface is independent of tectonic plate boundaries, and so hotspots may create a chain of volcanoes as the plates move above them.
The Hotchkiss gun can refer to different products of the Hotchkiss arms company starting in the late 19th century. It usually refers to the 1.65-inch (42 mm) light mountain gun; there were also a navy (47 mm) and a 3-inch (76 mm) Hotchkiss guns. The 42 mm gun was intended to be mounted on a light carriage or packed on two mules to accompany a troop of cavalry or an army travelling in rough country.
The gauge of a firearm is a unit of measurement used to express the inner diameter of the barrel.
Aroga is a genus of moths in the family Gelechiidae.
Dirhinosia is a genus of moths in the family Gelechiidae.
Ascalenia is a genus of moths in the family Cosmopterigidae.
Stigmella unifasciella is a moth of the family Nepticulidae. It is found in the United States in Kentucky, Ohio, Maryland, Illinois, Texas and Massachusetts.
The aspect ratio of an image is the ratio of its width to its height, and is expressed with two numbers separated by a colon, such as 16:9, sixteen-to-nine. For the x:y aspect ratio, the image is x units wide and y units high. Common aspect ratios are 1.85:1 and 2.39:1 in cinematography, 4:3 and 16:9 in television photography, and 3:2 in still photography.
Ascalenia unifasciella is a moth in the family Cosmopterigidae. It is found in Afghanistan.
Elachista unifasciella is a moth of the family Elachistidae found in Asia and Europe.
Dirhinosia cervinella is a moth of the family Gelechiidae. It is found in Russia, Ukraine, Bulgaria, Hungary, Croatia and Turkey.
Dirhinosia nitidula is a moth of the family Gelechiidae. It is found in Israel, Syria, Lebanon and Turkey.
Dirhinosia arnoldiella is a moth of the family Gelechiidae. It is found in Israel, Turkey and Greece.
Aroga unifasciella is a moth of the family Gelechiidae. It is found in North America, where it has been recorded from Montana south to western New Mexico, west through Arizona to eastern and southern California.
Anomologinae is a subfamily of moths in the family Gelechiidae.
References
- ↑ Tokár, Z. & L. Gozmány, 2004, Acta Zoologica Academiae Scientiarum Hungaricae50 (1): 63-74.