Bonnor beam — In general relativity, the Bonnor beam is an exact solution which models an infinitely long, straight beam of light. It is an explicit example of a pp wave spacetime.The Bonnor beam is obtained by matching together two regions:* a uniform plane… … Wikipedia
Quasi-phase-matching — is a technique in nonlinear optics which allows a positive net flow of energy from the pump frequency to the signal and idler frequencies by creating a periodic structure in the nonlinear medium. Momentum is conserved, as is necessary for phase… … Wikipedia
Alpha Beam with Ernie — Infobox VG title= Alpha Beam with Ernie caption= Screenshot from Alpha Beam with Ernie developer= Atari, Inc/Children s Computer Workshop publisher= Atari, Inc distributor= designer= series= engine= version= released= vgrelease|NA=1983 genre=… … Wikipedia
Nastia Liukin — Nastia redirects here. For other uses, see Nastia (disambiguation). Nastia Liukin Liukin at New York Fashion Week, February 13, 2009 Personal information Full name … Wikipedia
PU2RC — Per User Unitary Rate Control (PU2RC) is the world first codebook based multi user MIMO platform [cite conference|author=Niranjay Ravindran, Nihar Jindal, and Howard Huang|title=Beamforming with FiniteRate Feedback for LOS MIMO Downlink… … Wikipedia
Abnormal reflection — is a phenomenon relating to the wave length of reflected light whether in x rays, interactions with metals, or fluids. References * [http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1085297 On the Abnormal Reflection of X Rays by… … Wikipedia
Nonlinear optics — (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light. This nonlinearity is typically only observed… … Wikipedia
Antenna (radio) — Whip antenna on car … Wikipedia
Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… … Wikipedia
Art collections of Holkham Hall — Holkham Hall in Norfolk has extensive contents which include:Collections [ piano nobile at Holkham, showing the four symmetrical wings at each corner of the principal block. South is at the top of the plan. A Marble Hall; B The Saloon; C Statue… … Wikipedia
motion-picture technology — Introduction the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… … Universalium