0_Wizard
Migranes are pulsating in nature.
Typically, the headaches affect one half of the head, are pulsating in nature, and last from two to 72 hours.
chosen_Migraine_0
Migraine
chosen_topic_0_Migraine
Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either:  Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for example, varies by about 0.1% over an 11-year solar cycle. An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago may be the oldest preserved historical document of the discovery of a variable star, the eclipsing binary Algol.
Ed Shervington
Ed Shervington (born 11 March 1986 in Newport), is a Welsh rugby union player, in the position of hooker for Wasps  Born in Newport, Shervington debuted for Neath RFC 2003. After signing for Ospreys, he made his debut in September 2006, as a replacement against Ulster . Shervington was also allocated to play for Neath RFC in the Principality Premiership. Shervington has represented Wales at U18, U19 and U21 levels. Shervington then joined Worcester Warriors. He enjoyed a memorable debut season during the 2010/11 campaign. He has gone on to make 65 appearances for Worcester Warriors during his first three seasons at the club and signed contract extensions in 2011 and 2013.
BBC News presentation
The presentation and the identities of the BBC News Channel, the international counterpart BBC World News and the BBC Parliament coverage channel use specific identities that demonstrate their remit and purpose. BBC News 24 was launched at 5.30pm on 9 November 1997 as a domestic news channel operating 24 hours a day. It acted as a sister channel to BBC World which had launched two years earlier. As a result of this partnership between the two channels, they shared some overnight programming and the same identity consisting of flags designed by Lambie-Nairn. The rippling flags were mostly fictitious, but included the Flag of St. George, the Flag of St. Andrew, the Catalan flag and the Pakistani flag, accompanied by an orchestral soundtrack comprised most noticeable of Percussion instruments.  The channel logo consisted of the BBC logo with an uppercase 'News 24' written afterwards to the right of the logo.
Pulsation reactor
Pulsation reactor technology is a thermal procedure for manufacturing fine powders with precisely defined properties. Pulsation reactor technology is a thermal procedure with a special functional principle that results in reaction parameters and a reaction medium, and which ultimately leads to other property parameters in terms of surface, reactivity, homogeneity and particle size of the powder material. The technology has proven particularly effective in the manufacture of ceramic and submicroscale powders, as well as in the production of highly active catalysts. Also, simple oxides such as zirconium oxide with doping elements or mixed oxides like spinel can be produced in the pulsation reactor.
Pulsating white dwarf
A pulsating white dwarf is a white dwarf star whose luminosity varies due to non-radial gravity wave pulsations within itself. Known types of pulsating white dwarfs include DAV, or ZZ Ceti, stars, with hydrogen-dominated atmospheres and the spectral type DA; DBV, or V777 Her, stars, with helium-dominated atmospheres and the spectral type DB; and GW Vir stars, with atmospheres dominated by helium, carbon, and oxygen, and the spectral type PG 1159. (Some authors also include non-PG 1159 stars in the class of GW Vir stars.) GW Vir stars may be subdivided into DOV and PNNV stars; they are not, strictly speaking, white dwarfs but "pre-white dwarfs" which have not yet reached the white dwarf region on the Hertzsprung-Russell diagram.
Classical Cepheid variable
Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes from a few tenths of a magnitude to about 2 magnitudes. There exists a well-defined relationship between a classical Cepheid variable's luminosity and pulsation period, securing Cepheids as viable standard candles for establishing the galactic and extragalactic distance scales. HST observations of classical Cepheid variables have enabled firmer constraints on Hubble's law.
Pulsed DC
Pulsed DC (PDC) or pulsating direct current is a periodic current which changes in value but never changes direction. Some authors use the term pulsed DC to describe a signal consisting of one or more rectangular ("flat-topped"), rather than sinusoidal, pulses. Pulsed DC is commonly produced from a half-wave rectifier or a full-wave rectifier. Full wave rectified ac is more commonly known as Rectified AC. PDC has some characteristics of both alternating current (AC) and direct current (DC) waveforms. The voltage of a DC wave is roughly constant, whereas the voltage of an AC waveform continually varies between positive and negative values.