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If frequencies above the Nyquist Frequency are not filtered out, energy in these will appear as spectral artefacts below the Nyquist Frequency. Optical and electronic anti aliasing can be used to prevent this. Sometimes the higher frequencies are said to be “folded” back so the term “folding” is used.

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Valdkond/domeen: Chemistry
Category: Spectroscopy
Company: Newport
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Software; Computer; Operating systems

For the Quartz equivalent of the QuickDraw painting operation (such as that used for the QuickDraw function PaintOval), see filling.

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Software; Computer; Operating systems

An operation that changes the scale of the coordinate space by the specified x and y factors, effectively stretching or shrinking coordinates. The magnitude of the x and y factors ...

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Art history; General art history

Essentially, drawing is a technique in which images are depicted on a flat surface by making lines, though drawings can also contain tonal areas, washes and other non-linear ...

феяларды салу

Art history; General art history

A fascination with fairies and the supernatural was a phenomenon of the Victorian age and resulted in a distinctive strand of art depicting fairy subjects drawn from myth and ...

коллимация

Chemistry; Spectroscopy

The ideal input beam is a cylinder of light. No beam of finite dimensions can be perfectly collimated; at best there is a diffraction limit. In practice the input beam is a cone ...

бірігіп қосу

Chemistry; Spectroscopy

The process of adding interferograms together to achieve an improvement in signal-to-noise ratio.

орталық шығарылым

Chemistry; Spectroscopy

The sharp, intense part of an interferogram. The size of the centerburst is directly proportional to the amount of infrared radiation striking the detector.

импульстер қатарының қиюы

Chemistry; Spectroscopy

With no apodization, all points in an interferogram are given equal weight, up to the edges of the interferogram. If the resolution is less than the smallest linewidth in the ...

негізгі желіні түзету

Chemistry; Spectroscopy

A spectral manipulation technique used to correct spectra with sloped or varying baselines. The user must draw a function parallel to the baseline, then this function is ...

бедерсіз спектр

Chemistry; Spectroscopy

A single beam spectrum acquired with no sample in the infrared beam. The purpose of a background spectrum is to measure the contribution of the instrument and environment to the ...

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Valdkond/domeen: Language Category: Grammar

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Isolating languages tend to form their words of single morphemes (that is, of roots without affixes). They often use several short words where another ...