; Spectral resolution: The wavelength width of the different frequency bands recorded – usually, this is related to the number of frequency bands recorded by the platform.

Spectral width –

Spectral measurements have given bubble temperatures in the range from to, the exact temperatures depending on experimental conditions including the composition of the liquid and gas.

" Regarding his view on Spectral evidence, Upham concludes that " Cotton Mather never in any public writing ' denounced the admission ' of it, never advised its absolute exclusion ; but on the contrary recognized it as a ground of ' presumption ' ... once admitted nothing could stand against it.

Spectral lines also depend on the physical conditions of the gas, so they are widely used to determine the chemical composition of stars and other celestial bodies that cannot be analyzed by other means, as well as their physical conditions.

Measurements from the Spectral Irradiance Monitor on NASA's Solar Radiation and Climate Experiment show that solar UV output is more variable over the course of the solar cycle than scientists had previously thought, resulting in, for example, colder winters in the US and southern Europe and warmer winters in Canada and northern Europe during solar minima.

Spectral methods and finite element methods are closely related and built on the same ideas ; the main difference between them is that spectral methods use basis functions that are nonzero over the whole domain, while finite element methods use basis functions that are nonzero only on small subdomains.

* Spectral theory, in mathematics, a theory that extends eigenvalues and eigenvectors to linear operators on Hilbert space, and more generally to the elements of a Banach algebra

He completed his Ph. D. in 1954 under Paul Halmos ; his thesis was titled Spectral Theory for Operations on Banach Spaces.

Spectral lines are less dominant as light is produced across the spectrum, usually peaking, or " centered ", on a certain wavelength.

ATLAS-3 instruments, mounted on a Spacelab pallet in the cargo bay, included Atmospheric Trace Molecule Spectroscopy ( ATMOS ), which collected more data on trace gases in the atmosphere than on all three of its previous flights combined ; Shuttle Solar Backscatter Ultraviolet Spectrometer ( SSBUV ), which took ozone measurements to calibrate ozone monitor on aging NOAA-9 satellite as well as cooperative measurements with other ATLAS-3 instruments ; Active Cavity Radiometer Irradiance Monitor ( ACRIM ), which took extremely precise measurements of the sun's total radiation for 30 orbits as calibration reference for sister instrument on Upper Atmosphere Research Satellite ( UARS ) launched in 1991 ; Measurement of the Solar Constant ( SOLCON ), provided by Belgium, which also measured solar radiation but as reference point to track changes over years ; Solar Spectrum Measurement ( SOLSPEC ), French instrument, measured sun's radiation as function of wavelength ; and Solar Ultraviolet Spectral Irradiance Monitor ( SUSIM ), which collected its highest precision solar ultraviolet radiation measurements in its 15-year lifetime.

The HRI is an imaging device that combines a visible-light camera with a filter wheel, and an imaging infrared spectrometer called the " Spectral Imaging Module " or SIM that operates on a spectral band from 1. 05 to 4. 8 micrometres.

The points along the line segment have the same hue, with p < sub > e </ sub > increasing from 0 to 1 between the white point and position on the Spectral colors | spectral locus ( position of the color on the horseshoe shape in the diagram ) or ( as at the saturated end of the line shown in the diagram ) position on the line of purples.

* In 1979, former Genesis guitarist, Steve Hackett released the instrumental, " Clocks-The Angel of Mons ", on his album: Spectral Mornings.

The third album Spectral was recorded at Los Angered and Studio Underground and released on May 10, 2004, by Arise Records.

Many of his scientific works in medical genetics, cardiology, and internal medicine, specifically, Medical Genetic Studies of the Amish, Selected Papers Assembled with Commentary ( 1978 ); Probable Assignment of the Duffy Blood Group Locus to Chromosome 1 in Man ( 1968 ); and A Synopsis of Clinical Auscultation, Being a Treatise on Cardiovascular and Respiratory Sound, Introduced by a Historical Survey, Illustrated by Sound Spectrograms ( Spectral Phonocardiograms ), and Supplemented by a Comprehensive Bibliography ( 1956 ), have become historical documents in themselves.

A Synopsis of Clinical Auscultation, Being a Treatise on Cardiovascular and Respiratory Sound, Introduced by an Historical Survey, Illustrated by Sound Spectrograms ( Spectral Phonocardiograms ), and Supplemented by a Comprehensive Bibliography.

Spectral signatures of organic compounds have been seen on Elektra's surface.

Spectral characteristics can also be used to determine the membership ( or otherwise ) of asteroids in the outer regions of a family, as has been used e. g. for the Vesta family, whose members have an unusual composition.

* Doressoundiram, A .; Barucci, M. A .; Tozzi, G. P .; Poulet, F .; Boehnhardt, H .; de Bergh, C .; Peixinho, N. Spectral characteristics and modeling of the trans-neptunian object ( 55565 ) 2002 AW197 and the Centaurs ( 55576 ) 2002 GB10 and ( 83982 ) 2002 GO9: ESO Large Program on TNOs and Centaurs.

* Spectral bands, part of the optical spectra of polyatomic systems

* Spectral resolution, the capability of an optical system to distinguish different frequencies

Pulse durations less than approximately 100 fs are too short to be directly measured using optoelectronic techniques ( i. e. photodiodes ), and so indirect methods such as autocorrelation, Frequency-resolved optical gating, Spectral phase interferometry for direct electric-field reconstruction or Multi-photon Intrapulse Interference Phase Scan are used.

Measurement of the spectral coherence of light requires a nonlinear optical interferometer, such as an intensity optical correlator, frequency-resolved optical gating ( FROG ), or Spectral phase interferometry for direct electric-field reconstruction ( SPIDER ).

Mather's most fatal influence over the trials was in composing the answer to the question of whether or not to allow Spectral evidence, that is, allowing the afflicted girls to claim that some invisible ghost of the defendant was tormenting them, and for this to be considered evidence of witchcraft by the defendant, even if the defendant denied it and professed their own strongly held Christian beliefs.

Spectral evidence was once again in question.

* Spectral power distribution, of light

* Spectral power distributions

This effect is known as Spectral hole burning because a high power signal at one wavelength can ' burn ' a hole in the gain for wavelengths close to that signal by saturation of the inhomogeneously broadened ions.

* Spectral density estimation, in statistics and signal processing, an algorithm that estimates the strength of different frequency components ( the power spectrum ) of a time-domain signal.

** Spectral power distribution of an illuminant

# REDIRECT Spectral power distribution

Spectral density ( power distribution in the frequency spectrum ) is such a property, which can be used to distinguish different types of noise.

* Spectral power distribution, in color science, the power per unit area per unit wavelength of an illumination

Spectral hole burning is related to the gain profile broadening mechanisms such

* Bedini Audio Spectral Enhancer, an audio signal processor used in the early 1990s

* Spectral flatness measurement, used in digital audio signal processing

* Spectral leakage in signal processing

Spectral measurement devices are referred to as spectrometers, spectrophotometers, spectrographs or spectral analyzers.

Spectral line profiles of Tau Ceti are extremely narrow, indicating low turbulence and observed rotation.

Spectral sequences are less essential in the derived category approach, but still play a role whenever concrete computations are necessary.

Spectral differences generated by combinatorial labeling are captured and analyzed by using an interferometer attached to a fluorescence microscope.

Spectral models are often used for global models because some computations in modeling can be performed faster thus reducing the time needed to run the model simulation.

Other methods are designed to work with non-rigid ( bendable ) objects, e. g. for posture independent shape retrieval ( see for example Spectral shape analysis ).

Spectral lines are the result of interaction between a quantum system ( usually atoms, but sometimes molecules or atomic nuclei ) and a single photon.

Spectral lines are highly atom-specific, and can be used to identify the chemical composition of any medium capable of letting light pass through it ( typically gas is used ).

Spectral methods are a class of techniques used in applied mathematics and scientific computing to numerically solve certain differential equations, often involving the use of the Fast Fourier Transform.

Spectral methods are computationally less expensive that finite element methods, but become less accurate for problems with complex geometries and discontinuous coefficients.

Spectral graph theory is also concerned with graph parameters that are defined via multiplicites of eigenvalues of matrices associated to the graph, such as the Colin de Verdière number.

Spectral measurements put Ganymed in the S ( VI ) spectral subtype, indicating a surface rich in orthopyroxenes, and possibly metals ( although if metals are present they are covered and not readily apparent in the spectra ).

Spectral sequences are a generalization of exact sequences, and since their introduction by, they have become an important research tool, particularly in homotopy theory.

Headed by New Valarak's leader Leoric, the Spectral Knights are magic users who use magic for the purposes of good ; they are the protagonists of the series.