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Spectrum | A Wisdom Archive on Spectrum | | Spectrum A selection of articles related to Spectrum | |
| We recommend this article: Spectrum - 1, and also this: Spectrum - 2. |
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spectrum, Spectrum, Spectrum - Modern 17th through 21st centuries meaning in the physical sciences, Spectrum - Origins, Law of Attraction, Practising Law of Attraction, Law of Attraction for Prosperity, Law of Attraction for Love, Law of Attraction - Obstacles
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| ARTICLES RELATED TO Spectrum | | | |  Spectrum: Encyclopedia II - Spread spectrum - NotesSource: some of this article is based on Federal Standard 1037C, the NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management, MIL-STD-188 and the National Information Systems Security Glossary.
Source: History on spread spectrum, as given in "Smart Mobs, The Next Social Revolution", Howard Rheingold, ISBN 0-7382-0680-3
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See also:Spread spectrum, Spread spectrum - History, Spread spectrum - Spread-spectrum telecommunications, Spread spectrum - Spread-spectrum clock generation, Spread spectrum - Notes Read more here: » Spread spectrum: Encyclopedia II - Spread spectrum - Notes |
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| | | | | Spectrum: Encyclopedia II - Spectrum functional analysis - Spectrum of unbounded operators One can extend the definition of spectrum for unbounded operators on a Banach space X, operators which are no longer elements in the Banach algebra B(X). One proceeds in a manner similar to the bounded case. A complex number λ is said to be in the complement of the spectrum of a linear operator
if the operator is surjective, with its inverse a bounded operator. A complex number λ is then in the spectrum if this property fails to hold.
The spectrum ...
See also:Spectrum functional analysis, Spectrum functional analysis - Definition, Spectrum functional analysis - Basic properties, Spectrum functional analysis - Spectrum of a bounded operator, Spectrum functional analysis - Classification of points in the spectrum of an operator, Spectrum functional analysis - Point spectrum, Spectrum functional analysis - Approximate point spectrum, Spectrum functional analysis - Compression spectrum, Spectrum functional analysis - Further results, Spectrum functional analysis - Spectrum of unbounded operators Read more here: » Spectrum functional analysis: Encyclopedia II - Spectrum functional analysis - Spectrum of unbounded operators |
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| | | | | | | | | Spectrum: Encyclopedia II - Electromagnetic spectrum - Spectra of objects Nearly all objects in the universe emit, reflect and/or transmit some light. (One hypothetical exception may be dark matter.) The distribution of this light along the electromagnetic spectrum (called the spectrum of the object) is determined by the object's composition. Several types of spectra can be distinguished depending upon the nature of the radiation coming from an object:
If the spectrum is composed primarily of thermal radiation emitted by the object itself, an emission spectrum occurs.
Some bodie ...
See also:Electromagnetic spectrum, Electromagnetic spectrum - Spectra of objects, Electromagnetic spectrum - Classification systems, Electromagnetic spectrum - Radio frequency, Electromagnetic spectrum - Microwaves, Electromagnetic spectrum - Infrared radiation, Electromagnetic spectrum - Visible radiation light, Electromagnetic spectrum - Ultraviolet light, Electromagnetic spectrum - X-rays, Electromagnetic spectrum - Gamma rays Read more here: » Electromagnetic spectrum: Encyclopedia II - Electromagnetic spectrum - Spectra of objects |
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| | | | | Spectrum: Encyclopedia II - Spectrum functional analysis - Further results If T is a compact operator, then it can be shown that any nonzero λ in the spectrum is an eigenvalue. In other words, the spectrum of such an operator, which was defined as a generalization of the concept of eigenvalues, consists in this case only of the usual eigenvalues, and possibly 0.
If X is a Hilbert space and T is a normal operator, then a remarkable result known as the spectral theorem gives an analogue of the diagonalisation theorem for normal ...
See also:Spectrum functional analysis, Spectrum functional analysis - Definition, Spectrum functional analysis - Basic properties, Spectrum functional analysis - Spectrum of a bounded operator, Spectrum functional analysis - Classification of points in the spectrum of an operator, Spectrum functional analysis - Point spectrum, Spectrum functional analysis - Approximate point spectrum, Spectrum functional analysis - Compression spectrum, Spectrum functional analysis - Further results, Spectrum functional analysis - Spectrum of unbounded operators Read more here: » Spectrum functional analysis: Encyclopedia II - Spectrum functional analysis - Further results |
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| | | | | | | Spectrum: Encyclopedia II - Spectrum functional analysis - Basic properties The spectrum σ(x) of an element x of B is always compact and non-empty. If the spectrum were empty, then the resolvent function
R(λ) = (λe - x)-1
would be defined everywhere on the complex plane and bounded, which would imply by Liouville's theorem that this function is constant, thus everywhere zero as it is zero at infinity, which would be a contradiction. The boundedness of the spectrum follows from the Neumann series expansion in λ, which also help ...
See also:Spectrum functional analysis, Spectrum functional analysis - Definition, Spectrum functional analysis - Basic properties, Spectrum functional analysis - Spectrum of a bounded operator, Spectrum functional analysis - Classification of points in the spectrum of an operator, Spectrum functional analysis - Point spectrum, Spectrum functional analysis - Approximate point spectrum, Spectrum functional analysis - Compression spectrum, Spectrum functional analysis - Further results, Spectrum functional analysis - Spectrum of unbounded operators Read more here: » Spectrum functional analysis: Encyclopedia II - Spectrum functional analysis - Basic properties |
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| | | | | Spectrum: Encyclopedia II - Electromagnetic spectrum - Classification systems While the classification scheme is generally accurate, in reality there is often some overlap between neighboring types of electromagnetic energy. For example, SLF radio waves at 60 Hz may be received and studied by astronomers, or may be ducted along wires as electric power. Also, some low-energy gamma rays actually have a longer wavelength than some high-energy X-rays. This is possible because "gamma ray" is the name given to the photons generated from nuclear decay or other nuclear and subnuclear processes, whereas X-rays on the other han ...
See also:Electromagnetic spectrum, Electromagnetic spectrum - Spectra of objects, Electromagnetic spectrum - Classification systems, Electromagnetic spectrum - Radio frequency, Electromagnetic spectrum - Microwaves, Electromagnetic spectrum - Infrared radiation, Electromagnetic spectrum - Visible radiation light, Electromagnetic spectrum - Ultraviolet light, Electromagnetic spectrum - X-rays, Electromagnetic spectrum - Gamma rays Read more here: » Electromagnetic spectrum: Encyclopedia II - Electromagnetic spectrum - Classification systems |
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| | | | | Spectrum: Encyclopedia II - Political spectrum - Determining political spectra The key assumption of such a spectrum is that people's view(s) on many issues correlate strongly, or that one essential issue subsumes or dominates all others. For a political spectrum to exist, there must be a range of beliefs. Political systems in which most people fall clearly into one group or another with almost no one in between, such as most nationalist controversies, are not well described by a political spectrum.
In Iran, for instance, a political spectrum might be divided along the issue of the clergy's role in government. T ...
See also:Political spectrum, Political spectrum - Determining political spectra, Political spectrum - Left and Right, Political spectrum - Multiplicity of interpretation of the left-right axis, Political spectrum - Historical origin of the terms, Political spectrum - Alternative spectra, Political spectrum - Multi-axis models, Political spectrum - Eysenck model, Political spectrum - Nolan chart, Political spectrum - Political compass, Political spectrum - Pournelle chart, Political spectrum - Abstract political psychology chart, Political spectrum - Other models, Political spectrum - Ab-initio derived models Read more here: » Political spectrum: Encyclopedia II - Political spectrum - Determining political spectra |
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| | | | | Spectrum: Encyclopedia II - Political spectrum - Alternative spectra While the right-left spectrum is so common as to be taken for granted, numerous alternatives exist, usually having been developed by people who feel their views are not fairly represented on the traditional right-left spectrum.
The design of a spectrum itself can be politically motivated.
Another alternative spectrum offered by the conservative American Federalist Journal emphasizes the degree of political control, and thus places totalitarianism at one extreme ...
See also:Political spectrum, Political spectrum - Determining political spectra, Political spectrum - Left and Right, Political spectrum - Multiplicity of interpretation of the left-right axis, Political spectrum - Historical origin of the terms, Political spectrum - Alternative spectra, Political spectrum - Multi-axis models, Political spectrum - Eysenck model, Political spectrum - Nolan chart, Political spectrum - Political compass, Political spectrum - Pournelle chart, Political spectrum - Abstract political psychology chart, Political spectrum - Other models, Political spectrum - Ab-initio derived models Read more here: » Political spectrum: Encyclopedia II - Political spectrum - Alternative spectra |
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| | | | | Spectrum: Encyclopedia II - Autistic spectrum - ADHD and autism Some research has indicated a possible genetic and behavioral connection between ADHD and autism. As a result, some clinicians have suggested that ADHD be included under the category of autism spectrum disorders. Others disagree. [1]
Diagnoses of ADHD together with autism spectrum disorder are becoming increasingly common in children. In young children, the two conditions can appear similar. However, as children age, differences emerge between the two conditions. Children with typical autism become more withdrawn, while with a suitable environment hyperactivity reduces. In e ...
See also:Autistic spectrum, Autistic spectrum - Autistic spectrum and pervasive development disorders, Autistic spectrum - Autistic traits, Autistic spectrum - Social impairment, Autistic spectrum - Language impairment, Autistic spectrum - Imaginative impairment and repetitive adherence, Autistic spectrum - Sensory integration dysfunction, Autistic spectrum - ADHD and autism Read more here: » Autistic spectrum: Encyclopedia II - Autistic spectrum - ADHD and autism |
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| | | | | Spectrum: Encyclopedia II - Political spectrum - Left and Right See main article Left-Right politics
In modern Western countries, the political spectrum usually is described along left-right lines. This traditional political spectrum is defined along an axis with conservatism, theocracy, and Fascism ("the Right") on one end, and socialism and communism, ("the Left") on the other. Free market liberalism is generally considered to be center-right; new liberalism or social liberalism is generally assigned to the center, center-left or sometimes (when viewed by conservatives) the left. Christian Democracy may be anywhere from center-ri ...
See also:Political spectrum, Political spectrum - Determining political spectra, Political spectrum - Left and Right, Political spectrum - Multiplicity of interpretation of the left-right axis, Political spectrum - Historical origin of the terms, Political spectrum - Alternative spectra, Political spectrum - Multi-axis models, Political spectrum - Eysenck model, Political spectrum - Nolan chart, Political spectrum - Political compass, Political spectrum - Pournelle chart, Political spectrum - Abstract political psychology chart, Political spectrum - Other models, Political spectrum - Ab-initio derived models Read more here: » Political spectrum: Encyclopedia II - Political spectrum - Left and Right |
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| | | | | Spectrum: Encyclopedia II - Political spectrum - Multi-axis models A one-axis model is highly over-simplified, and lumps together fairly different political propositions; in particular, as seen before, there are many ways to define the left-right spectrum, which do not yield the same classifications.
Several of the political philosophies that have arisen over the past two centuries do not fit on the one-dimensional left/right line, in particular anarchism and libertarianism. Anarchism is assumed to be "left", while Libertarianism is assumed to be "right". However, on the one-dimensional spectrum, ana ...
See also:Political spectrum, Political spectrum - Determining political spectra, Political spectrum - Left and Right, Political spectrum - Multiplicity of interpretation of the left-right axis, Political spectrum - Historical origin of the terms, Political spectrum - Alternative spectra, Political spectrum - Multi-axis models, Political spectrum - Eysenck model, Political spectrum - Nolan chart, Political spectrum - Political compass, Political spectrum - Pournelle chart, Political spectrum - Abstract political psychology chart, Political spectrum - Other models, Political spectrum - Ab-initio derived models Read more here: » Political spectrum: Encyclopedia II - Political spectrum - Multi-axis models |
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