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In most modern usages of spectrum there is a unifying theme between extremes at either end. Some older usages of the word did not have a unifying theme, but they led to modern ones through a sequence of events set out below. Modern usages in mathematics did evolve from a unifying theme, but this may be difficult to recognize.

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Blogs for Spectrum

Spectrum Blog | Spectrum

Spectrum Blog. 1 March 2009. Paul Harvey 1918-2009. By Jared ... blogs. comments. The point here at Spectrum is an open door — the open door of dialogue. ...spectrummagazine.org/blog/

The Spectrum Blog

Adventist community ... The Spectrum Blog. Kenneth Newport Explains the Flames of Waco ... combined the main Spectrum site and this blog into a new ...spectrummagazine.typepad.com/

Spectrum Magazine

Journal of the Association of Adventist Forums, promoting discussion of contemporary Christian issues.www.spectrummagazine.org/

Spectrum

This is our first real gadget's post! :) Thanks for visiting! ... Search this blog: Recent Posts. Gadget's Post. New iPhone released! Subscribe to this blog's feed ...blogs.spectrum.ieee.org/

AALL Spectrum Blog

... place for law librarians to discuss AALL Spectrum articles and their profession. Blog ... Theme: k2 by k2 team. Blog at WordPress.com. RSS Entries and ...aallspectrum.wordpress.com/

Wikipedia About Spectrum

Rainbow%20above%20Kaviskis%20Lake%2C%20Lithuania.jpg

In most modern usages of spectrum there is a unifying theme between extremes at either end. Some older usages of the word did not have a unifying theme, but they led to modern ones through a sequence of events set out below. Modern usages in mathematics did evolve from a unifying theme, but this may be difficult to recognize.

Origins

In Latin spectrum means "image" or "apparition", including the meaning "spectre". Spectral evidence is testimony about what was done by spectres of persons not present physically, or hearsay evidence about what ghosts or apparitions of Satan said. It was used to convict a number of persons of witchcraft at Salem, Massachusetts in the late 17th century.

Modern meaning in the physical sciences

K4iii-spectre.png

In the 17th century the word spectrum was introduced into optics, referring to the range of colors observed when white light was dispersed through a prism. Soon the term referred to a plot of light intensity or power as a function of frequency or wavelength, also known as a spectral density.

The term spectrum was soon applied to other waves, such as sound waves, and now applies to any signal that can be decomposed into frequency components. A spectrum is a usually 2-dimensional plot, of a compound signal, depicting the components by another measure. Sometimes, the word spectrum refers to the compound signal itself, such as the "spectrum of visible light", a reference to those electromagnetic waves which are visible to the human eye. Looking at light through a prism separates visible light into its colors according to wavelength. It separates them according to its dispersion relation and a grating separates according to the grating equation and if massive particles are measured often their speed is measured. To get a spectrum, the measured function has to be transformed in their independent variable to frequencies and the dependent variable has to be reduced in regions, where the independent variable is stretched. For this imagine that the spectrum of pulse with a finite number of particles is measured on a film or a CCD. Assuming no particles are lost, any nonlinearity (compared to frequency) on the spectral separation concentrates particles at some points of the film. The same is true for taking a spectrum by scanning a monochromator with a fixed slit width. Violet at one end has the shortest wavelength and red at the other end has the longest wavelength of visible light. The colors in order are violet, blue, green, yellow, orange, red. As the wavelengths get bigger below the red visible light they become infrared, microwave, and radio. As the wavelengths get smaller above violet light, they become ultra-violet, x-ray, and gamma ray.

Search results for Spectrum

Spectrum Brands

Spectrum Brands is a global consumer products company with a diverse portfolio of world-class brands, including Rayovac, Varta and Remington.www.spectrumbrands.com/

SPECTRUM

Policy Papers Vol.3, Issue # 6 (26) IRAN AS A REGIONAL POWER: PROBLEMS AND PERSPECTIVES ... In case of the South Caucasus there is a lack of optimism as far as the ...spectrum.am/

Spectrum | Healthy Organic, Artisan and Omega-3 Supplement Oils

Explore Spectrum's select organic and artisan vegetable oils from around the world. ... Spectrum Naturals is a proud supporter of Children's Heartlink. ...www.spectrumorganics.com/

Spectrum

2009-02-26 - Spectrum Wins Another CAAS III Task Order. On 13 Feb, 2009 Spectrum was awarded its 17th task order under the ACC ...www.sptrm.com/

IEEE Spectrum: About Us

Spectrum Online is the member publication of the IEEE, the world's leading society for engineering technology, computer engineering, and communications technologies.www.spectrum.ieee.org/aboutus

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News about Spectrum

Deadly attack on British base rattles Northern Ireland

Los Angeles TimesBritain's prime minister and others vow that the peace effort won't be derailed by the shooting at an army base that killed two soldiers and injured four people, including two pizza deliverymen. Leaders from across the political spectrum vowed Sunday that the first fatal attack on British soldiers in Northern Ireland in 12 years would not derail the peace process put in motion by the historic ....http://www.latimes.com/news/nationworld/world/la-fg-northern...

Northern Ireland soldier shootings 'will not affect peace process'

Daily TelegraphThe executionstyle murder of two soldiers outside their barracks in Northern Ireland by Republican terrorists will not be allowed to affect the peace process leaders across the political spectrum have vowed.http://www.telegraph.co.uk/news/uknews/northernireland/49586...

LCCC goes green across spectrum

The TelegraphGODFREY - Green is everyone's new favorite color, as organizations, schools and individuals try to preserve the environment - and the Earth as we know it.http://www.thetelegraph.com/news/green_24370___article.html/...

Bankruptcy court approves financing for Spectrum Brands

BizJournalsThe U.S. Bankruptcy Court has granted Spectrum Brands Inc., the parent of Rayovac in Madison, final approval to receive $235 million in debtor-in-possession financing.http://www.bizjournals.com/milwaukee/stories/2009/03/02/dail...

Bittersweet return

Laredo Morning TimesLaredo Bucks head coach Terry Ruskowski has displayed a spectrum of emotions ranging from excitement to anger to frustration to glee following his team's games this season.http://www.lmtonline.com/articles/2009/03/09/sports/doc49b4c...

News about Spectrum

Wine, Desert, Turrell

Wall Street JournalCity of Arhirit" (1976) leads the viewer through a series of light-filled rooms, each representing a different part of the light spectrum. "Alta Green" (1968) is an early piece in which Mr. Turrell experiments with light and architecture. The cross ... http://online.wsj.com/article/SB124225587936117143.html

Solaris Mobile Statement on S-band Payload

Businesswire.comSolaris Mobile remains confident of its ability to meet the commitments made according to the European Selection and Authorisation Process, under which it has applied for S-band spectrum to provide these services. The company is ... http://www.businesswire.com/news/home/20090513006417/en

ACT Today! Luncheon Raises over $25K for autistic families in need

Daily PilotWe wanted to show mothers of children on the autism spectrum love by treating them to a day of inspiration at one of the most beautiful resorts in the world, The fact that we raised over $25,000 for families in need of effective autism services while ... http://www.dailypilot.com/articles/2009/05/13/townhall/doc4a...

United by airwave usage

Chicago Tribune ... over national communications policy, Google , the wireless industry and consumer advocates have come together to support a bill that would require the federal government to take a complete inventory of the national airwaves to determine what spectrum ... http://www.chicagotribune.com/business/chi-tc-biz-google-air...

Spectrum launches CarSCAN screening tech

United Press InternationalSAN DIEGO , May 13 (UPI) -- Spectrum San Diego announced the launch of its new scanning system, capable of detecting explosives and other illicit threats in cars and light trucks. U.S. company Spectrum has released its CarSCAN X-ray technology. The ... http://www.upi.com/Security_Industry/2009/05/13/Spectrum-lau...

Search results for Spectrum

IEEE Spectrum Online: Technology, Engineering, and Science News

The lastest in science, engineering, and technology news from IEEE Spectrum Online, the flagship publication of the IEEE and trusted source of technology innovators.http://www.spectrum.ieee.org/

Spectrum Health

Raising the Bar for Children's Health Care. The new Helen DeVos Children's Hospital in Grand Rapids will transform health care for kids in Michigan.http://spectrum-health.org/?intro=0&hospID=8A4CF2B2AB8E4216A...

Welcome to Spectrum Glass

Manufacturer of products for architecture, kilnforming, and other glassworking arts. Glass includes reamy, baroque, waterglass, and other textures. Offers online factory tour, free ... http://www.spectrumglass.com/

Spectrum Aeronautical - Spectrum

The official Spectrum Aeronautical site. View Spectrum Aeronautical design, technology, vision, company information, and aircraft specifications.http://www.spectrum.aero/

Spectrum Fantastic Art - http://www.spectrumfantasticart.com

Spectrum: The Best in Contemporary Fantastic Art - Official Website - http:/www.spectrumfantasticart.com/http://www.spectrumfantasticart.com/

Wikipedia results for Spectrum

Spectrum - Wikipedia, the free encyclopedia

A spectrum (plural spectra or spectrums [1]) is a condition that is not limited to a specific set of values but can vary infinitely within a continuum.http://en.wikipedia.org/wiki/Spectrum

Electromagnetic spectrum - Wikipedia, the free encyclopedia

The electromagnetic spectrum is the range of all possible electromagnetic radiation frequencies. [1] The "electromagnetic spectrum" (usually just spectrum) of an object is the ... http://en.wikipedia.org/wiki/Electromagnetic_spectrum

Sinclair ZX Spectrum - Wikipedia, the free encyclopedia

The Sinclair ZX Spectrum (Pronounced: "Zed Ecks Spec-trum" from its original British English branding) is an 8-bit personal home computer released in the United Kingdom in 1982 by ... http://en.wikipedia.org/wiki/ZX_Spectrum

Spectrum analyzer - Wikipedia, the free encyclopedia

A spectrum analyzer or spectral analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform. It may also measure the power ... http://en.wikipedia.org/wiki/Spectrum_analyzer

Wachovia Spectrum - Wikipedia, the free encyclopedia

The Wachovia Spectrum (formerly known as the Spectrum (1967–1994), CoreStates Spectrum (1994–1998) and First Union Spectrum (1998–2003) is an indoor arena located in ... http://en.wikipedia.org/wiki/Wachovia_Spectrum
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Videos found for Spectrum

Flyers Say Goodbye To Wachovia Spec...

Flyers Say Goodbye To Wachovia SpectrumThe Wachovia Spectrum will close down at the end of the 2008-09 hockey/soccer season, the Flyers bid farewell to the old arena with a special preseason game at the Spectrum.Windows Media - Video

Romney is ‘full spectrum candidat...

Romney is ‘full spectrum candidate’Jan. 15: Kevin Madden, Mitt Romney’s National Press Secretary, claims that presidential candidate Mitt Romney is a ‘full spectrum candidate’ who can unite the Republican...Windows Media - Video

N.J. Couple At Opposite Ends Of Pol...

N.J. Couple At Opposite Ends Of Political SpectrumA New Jersey couple who has been married for 17 years find themselves on the opposite ends of the political aisle.Windows Media - Video

spectrum

spectrumStrawberry Kiss Studios presents... Title: spectrum Anime: (To be added) PV: Rolling Star by YUI (copyright Sony) Music: Rolling Star by YUI Programs: Sony Vegas 8 Pro, Adobe...Flash - Video

Dr Whiting on Full Spectrum Nutriti...

Dr Whiting on Full Spectrum Nutrition and Mulit-VitaminsFull Spectrum nutrition is the concept of providing the body with all the essential nutrients it needs in the right potency, ratio and absorption factors to ensure maximum...Flash - Video

Answers for Spectrum

lucasfox792What color spectrum for freshwater live planted tank?lucasfox792Spectrum measure in Kelvin (K) really isn't a great method of determining the quality of a bulb for plant growth. Spectrum is just a measurement of how our eyes perceive light (higher Kelvin ratings ...liegsweord373What is the deal with atoms and light spectrum?liegsweord373well, there are two types of spectra: absorption and emission. Atoms, normally have their electrons floating around at their lowest energy levels. When you give them energy (ie shine light), some elec...Semper FiIs Spectrum organic unpasteurized apple cider vinegar good for you to take before meals?Semper FiANY apple cider vinegar before a meal is good for you... A tablespoon or two of A.C.V. and a teaspoon of Olive Oil 30 min's before a mean is suposed to be REALLY good for you and help you maintain...Jen SWhat is the difference between a line spectrum and a continuous spectrum?Jen SLine spectrum is a spectrum showing only certain colors of specific wavelengths of light. Continuous spectrum is a spectrum containing light of all wavelengths, like a rainbow.dthurst2What is the difference between a bright line spectrum and a continuous spectrum?dthurst2A bright line spectrum, which is common, shows the frequency of light being emitted from a excited electron when if falls back to a ground state. Continuous spectrums are typically made up of so ma...
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