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Há 4 horas · Size: As a linear antenna is increased in size from very short up to approximately 5/8 of a wavelength, the forward linear gain increases from 1.5 to 3.12. With longer lengths the radiation pattern breaks-up and no-longer looks like a dough-nut and contains multiple lobes with energy no longer being directed in the main direction perpendicular to the antenna element.
Há 4 horas · The influential observer Eugène Antoniadi used the 83-cm (32.6 inch) aperture telescope at Meudon Observatory at the 1909 opposition of Mars and saw no canals, the outstanding photos of Mars taken at the new Baillaud dome at the Pic du Midi observatory also brought formal discredit to the Martian canals theory in 1909, and the notion of canals began to fall out of favor.
Há 1 dia · Raúl (footballer) Raúl González Blanco ( Spanish pronunciation: [raˈul ɣonˈθaleθ ˈβlaŋko]; born 27 June 1977), known as Raúl, is a Spanish football manager and former player who played as a forward. He is the current manager of Real Madrid Castilla, the reserve team of La Liga club Real Madrid. Raúl is regarded as one of the ...
Há 4 horas · Scott Altman – former NASA astronaut and commander of Space Shuttle missions STS-109 (2002) and STS-125 (2009). Altman deployed twice on the USS Carl Vinson as an F-14 pilot of VF-51 from 1984 to 1987 and worked as a test pilot for F-14 test programs, including the first deployment of the F-14D variant in 1992, before being selected for the NASA astronaut program.
Há 1 dia · Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes. It is one of the rarer elements in Earth's crust, with an average abundance of approximately 5 μg /kg. It occurs in some nickel and copper ores along with some native deposits, mostly in South Africa ...
Há 1 dia · The Nibiru cataclysm is a supposed disastrous encounter between Earth and a large planetary object (either a collision or a near-miss) that certain groups believed would take place in the early 21st century. Believers in this doomsday event usually refer to this object as Nibiru or Planet X. The idea was first put forward in 1995 by Nancy ...
Há 1 dia · American bison Temporal range: 0.01–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Early Holocene – present Plains bison (Bison bison bison) Wood bison (Bison bison athabascae) Conservation status Near Threatened (IUCN 3.1) Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Family: Bovidae Subfamily: Bovinae Subtribe: Bovina Genus ...
