Search results
Results from the WOW.Com Content Network
Millimeter waves show "optical" propagation characteristics and can be reflected and focused by small metal surfaces and dielectric lenses around 5 to 30 cm (2 inches to 1 foot) diameter. Because their wavelengths are often much smaller than the equipment that manipulates them, the techniques of geometric optics can be used.
The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).
Bushmeat extraction in the Amazon rainforest was estimated to be much lower, at 3.69 ± 3.9 kg/km 2 (21.1 ± 22.3 lb/sq mi) in the case of species weighing more than 10 kg and 0.6 ± 0.9 kg/km 2 (3.4 ± 5.1 lb/sq mi) in the case of species weighing less than 10 kg, based on 3 individuals.
Super high frequency (SHF) is the ITU designation [1] [2] for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from one to ten centimetres.
The first 2 mm distance record, and still standing longest distance achieved on the band, was set by US stations WA1ZMS and W4WWQ, who established contact at 114.4 kilometres (71.1 mi) on February 26, 2006. [4] The longest distance achieved on 2 mm in the United Kingdom was 35.6 kilometres (22.1 mi) between stations G8ACE and G8KQW on January ...
The SI unit of molar absorption coefficient is the square metre per mole (m 2 /mol), but in practice, quantities are usually expressed in terms of M −1 ⋅cm −1 or L⋅mol −1 ⋅cm −1 (the latter two units are both equal to 0.1 m 2 /mol). In older literature, the cm 2 /mol is sometimes used; 1 M −1 ⋅cm −1 equals 1000 cm 2 /mol.
The waveguide E band is the range of radio frequencies from 60 GHz to 90 GHz in the electromagnetic spectrum, [1] [2] corresponding to the recommended frequency band of operation of WR12 waveguides. These frequencies are equivalent to wave lengths between 5 mm and 3.333 mm. The E band is in the EHF range of the radio spectrum
The common white wave (Cabera pusaria) is a moth of the family Geometridae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae . It is found throughout the Palearctic region.